1ac27a0ecSDave Kleikamp /* 2617ba13bSMingming Cao * linux/fs/ext4/super.c 3ac27a0ecSDave Kleikamp * 4ac27a0ecSDave Kleikamp * Copyright (C) 1992, 1993, 1994, 1995 5ac27a0ecSDave Kleikamp * Remy Card (card@masi.ibp.fr) 6ac27a0ecSDave Kleikamp * Laboratoire MASI - Institut Blaise Pascal 7ac27a0ecSDave Kleikamp * Universite Pierre et Marie Curie (Paris VI) 8ac27a0ecSDave Kleikamp * 9ac27a0ecSDave Kleikamp * from 10ac27a0ecSDave Kleikamp * 11ac27a0ecSDave Kleikamp * linux/fs/minix/inode.c 12ac27a0ecSDave Kleikamp * 13ac27a0ecSDave Kleikamp * Copyright (C) 1991, 1992 Linus Torvalds 14ac27a0ecSDave Kleikamp * 15ac27a0ecSDave Kleikamp * Big-endian to little-endian byte-swapping/bitmaps by 16ac27a0ecSDave Kleikamp * David S. Miller (davem@caip.rutgers.edu), 1995 17ac27a0ecSDave Kleikamp */ 18ac27a0ecSDave Kleikamp 19ac27a0ecSDave Kleikamp #include <linux/module.h> 20ac27a0ecSDave Kleikamp #include <linux/string.h> 21ac27a0ecSDave Kleikamp #include <linux/fs.h> 22ac27a0ecSDave Kleikamp #include <linux/time.h> 23c5ca7c76STheodore Ts'o #include <linux/vmalloc.h> 24dab291afSMingming Cao #include <linux/jbd2.h> 25ac27a0ecSDave Kleikamp #include <linux/slab.h> 26ac27a0ecSDave Kleikamp #include <linux/init.h> 27ac27a0ecSDave Kleikamp #include <linux/blkdev.h> 28ac27a0ecSDave Kleikamp #include <linux/parser.h> 29ac27a0ecSDave Kleikamp #include <linux/buffer_head.h> 30a5694255SChristoph Hellwig #include <linux/exportfs.h> 31ac27a0ecSDave Kleikamp #include <linux/vfs.h> 32ac27a0ecSDave Kleikamp #include <linux/random.h> 33ac27a0ecSDave Kleikamp #include <linux/mount.h> 34ac27a0ecSDave Kleikamp #include <linux/namei.h> 35ac27a0ecSDave Kleikamp #include <linux/quotaops.h> 36ac27a0ecSDave Kleikamp #include <linux/seq_file.h> 379f6200bbSTheodore Ts'o #include <linux/proc_fs.h> 383197ebdbSTheodore Ts'o #include <linux/ctype.h> 391330593eSVignesh Babu #include <linux/log2.h> 40717d50e4SAndreas Dilger #include <linux/crc16.h> 417abc52c2SDan Magenheimer #include <linux/cleancache.h> 42ac27a0ecSDave Kleikamp #include <asm/uaccess.h> 43ac27a0ecSDave Kleikamp 44bfff6873SLukas Czerner #include <linux/kthread.h> 45bfff6873SLukas Czerner #include <linux/freezer.h> 46bfff6873SLukas Czerner 473dcf5451SChristoph Hellwig #include "ext4.h" 486f91bc5fSEric Gouriou #include "ext4_extents.h" 493dcf5451SChristoph Hellwig #include "ext4_jbd2.h" 50ac27a0ecSDave Kleikamp #include "xattr.h" 51ac27a0ecSDave Kleikamp #include "acl.h" 523661d286STheodore Ts'o #include "mballoc.h" 53ac27a0ecSDave Kleikamp 549bffad1eSTheodore Ts'o #define CREATE_TRACE_POINTS 559bffad1eSTheodore Ts'o #include <trace/events/ext4.h> 569bffad1eSTheodore Ts'o 571f109d5aSTheodore Ts'o static struct proc_dir_entry *ext4_proc_root; 583197ebdbSTheodore Ts'o static struct kset *ext4_kset; 590b75a840SLukas Czerner static struct ext4_lazy_init *ext4_li_info; 600b75a840SLukas Czerner static struct mutex ext4_li_mtx; 610b75a840SLukas Czerner static struct ext4_features *ext4_feat; 629f6200bbSTheodore Ts'o 63617ba13bSMingming Cao static int ext4_load_journal(struct super_block *, struct ext4_super_block *, 64ac27a0ecSDave Kleikamp unsigned long journal_devnum); 65e2d67052STheodore Ts'o static int ext4_commit_super(struct super_block *sb, int sync); 66617ba13bSMingming Cao static void ext4_mark_recovery_complete(struct super_block *sb, 67617ba13bSMingming Cao struct ext4_super_block *es); 68617ba13bSMingming Cao static void ext4_clear_journal_err(struct super_block *sb, 69617ba13bSMingming Cao struct ext4_super_block *es); 70617ba13bSMingming Cao static int ext4_sync_fs(struct super_block *sb, int wait); 71617ba13bSMingming Cao static const char *ext4_decode_error(struct super_block *sb, int errno, 72ac27a0ecSDave Kleikamp char nbuf[16]); 73617ba13bSMingming Cao static int ext4_remount(struct super_block *sb, int *flags, char *data); 74617ba13bSMingming Cao static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf); 75c4be0c1dSTakashi Sato static int ext4_unfreeze(struct super_block *sb); 76617ba13bSMingming Cao static void ext4_write_super(struct super_block *sb); 77c4be0c1dSTakashi Sato static int ext4_freeze(struct super_block *sb); 78152a0836SAl Viro static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags, 79152a0836SAl Viro const char *dev_name, void *data); 802035e776STheodore Ts'o static inline int ext2_feature_set_ok(struct super_block *sb); 812035e776STheodore Ts'o static inline int ext3_feature_set_ok(struct super_block *sb); 82d39195c3SAmir Goldstein static int ext4_feature_set_ok(struct super_block *sb, int readonly); 83bfff6873SLukas Czerner static void ext4_destroy_lazyinit_thread(void); 84bfff6873SLukas Czerner static void ext4_unregister_li_request(struct super_block *sb); 858f1f7453SEric Sandeen static void ext4_clear_request_list(void); 86ac27a0ecSDave Kleikamp 872035e776STheodore Ts'o #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) 882035e776STheodore Ts'o static struct file_system_type ext2_fs_type = { 892035e776STheodore Ts'o .owner = THIS_MODULE, 902035e776STheodore Ts'o .name = "ext2", 912035e776STheodore Ts'o .mount = ext4_mount, 922035e776STheodore Ts'o .kill_sb = kill_block_super, 932035e776STheodore Ts'o .fs_flags = FS_REQUIRES_DEV, 942035e776STheodore Ts'o }; 952035e776STheodore Ts'o #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type) 962035e776STheodore Ts'o #else 972035e776STheodore Ts'o #define IS_EXT2_SB(sb) (0) 982035e776STheodore Ts'o #endif 992035e776STheodore Ts'o 1002035e776STheodore Ts'o 101ba69f9abSJan Kara #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) 102ba69f9abSJan Kara static struct file_system_type ext3_fs_type = { 103ba69f9abSJan Kara .owner = THIS_MODULE, 104ba69f9abSJan Kara .name = "ext3", 105152a0836SAl Viro .mount = ext4_mount, 106ba69f9abSJan Kara .kill_sb = kill_block_super, 107ba69f9abSJan Kara .fs_flags = FS_REQUIRES_DEV, 108ba69f9abSJan Kara }; 109ba69f9abSJan Kara #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type) 110ba69f9abSJan Kara #else 111ba69f9abSJan Kara #define IS_EXT3_SB(sb) (0) 112ba69f9abSJan Kara #endif 113bd81d8eeSLaurent Vivier 1149933fc0aSTheodore Ts'o void *ext4_kvmalloc(size_t size, gfp_t flags) 1159933fc0aSTheodore Ts'o { 1169933fc0aSTheodore Ts'o void *ret; 1179933fc0aSTheodore Ts'o 1189933fc0aSTheodore Ts'o ret = kmalloc(size, flags); 1199933fc0aSTheodore Ts'o if (!ret) 1209933fc0aSTheodore Ts'o ret = __vmalloc(size, flags, PAGE_KERNEL); 1219933fc0aSTheodore Ts'o return ret; 1229933fc0aSTheodore Ts'o } 1239933fc0aSTheodore Ts'o 1249933fc0aSTheodore Ts'o void *ext4_kvzalloc(size_t size, gfp_t flags) 1259933fc0aSTheodore Ts'o { 1269933fc0aSTheodore Ts'o void *ret; 1279933fc0aSTheodore Ts'o 128db9481c0SMathias Krause ret = kzalloc(size, flags); 1299933fc0aSTheodore Ts'o if (!ret) 1309933fc0aSTheodore Ts'o ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL); 1319933fc0aSTheodore Ts'o return ret; 1329933fc0aSTheodore Ts'o } 1339933fc0aSTheodore Ts'o 1349933fc0aSTheodore Ts'o void ext4_kvfree(void *ptr) 1359933fc0aSTheodore Ts'o { 1369933fc0aSTheodore Ts'o if (is_vmalloc_addr(ptr)) 1379933fc0aSTheodore Ts'o vfree(ptr); 1389933fc0aSTheodore Ts'o else 1399933fc0aSTheodore Ts'o kfree(ptr); 1409933fc0aSTheodore Ts'o 1419933fc0aSTheodore Ts'o } 1429933fc0aSTheodore Ts'o 1438fadc143SAlexandre Ratchov ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 1448fadc143SAlexandre Ratchov struct ext4_group_desc *bg) 145bd81d8eeSLaurent Vivier { 1463a14589cSAneesh Kumar K.V return le32_to_cpu(bg->bg_block_bitmap_lo) | 1478fadc143SAlexandre Ratchov (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 1488fadc143SAlexandre Ratchov (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); 149bd81d8eeSLaurent Vivier } 150bd81d8eeSLaurent Vivier 1518fadc143SAlexandre Ratchov ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 1528fadc143SAlexandre Ratchov struct ext4_group_desc *bg) 153bd81d8eeSLaurent Vivier { 1545272f837SAneesh Kumar K.V return le32_to_cpu(bg->bg_inode_bitmap_lo) | 1558fadc143SAlexandre Ratchov (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 1568fadc143SAlexandre Ratchov (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); 157bd81d8eeSLaurent Vivier } 158bd81d8eeSLaurent Vivier 1598fadc143SAlexandre Ratchov ext4_fsblk_t ext4_inode_table(struct super_block *sb, 1608fadc143SAlexandre Ratchov struct ext4_group_desc *bg) 161bd81d8eeSLaurent Vivier { 1625272f837SAneesh Kumar K.V return le32_to_cpu(bg->bg_inode_table_lo) | 1638fadc143SAlexandre Ratchov (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 1648fadc143SAlexandre Ratchov (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); 165bd81d8eeSLaurent Vivier } 166bd81d8eeSLaurent Vivier 167021b65bbSTheodore Ts'o __u32 ext4_free_group_clusters(struct super_block *sb, 168560671a0SAneesh Kumar K.V struct ext4_group_desc *bg) 169560671a0SAneesh Kumar K.V { 170560671a0SAneesh Kumar K.V return le16_to_cpu(bg->bg_free_blocks_count_lo) | 171560671a0SAneesh Kumar K.V (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 172560671a0SAneesh Kumar K.V (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0); 173560671a0SAneesh Kumar K.V } 174560671a0SAneesh Kumar K.V 175560671a0SAneesh Kumar K.V __u32 ext4_free_inodes_count(struct super_block *sb, 176560671a0SAneesh Kumar K.V struct ext4_group_desc *bg) 177560671a0SAneesh Kumar K.V { 178560671a0SAneesh Kumar K.V return le16_to_cpu(bg->bg_free_inodes_count_lo) | 179560671a0SAneesh Kumar K.V (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 180560671a0SAneesh Kumar K.V (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0); 181560671a0SAneesh Kumar K.V } 182560671a0SAneesh Kumar K.V 183560671a0SAneesh Kumar K.V __u32 ext4_used_dirs_count(struct super_block *sb, 184560671a0SAneesh Kumar K.V struct ext4_group_desc *bg) 185560671a0SAneesh Kumar K.V { 186560671a0SAneesh Kumar K.V return le16_to_cpu(bg->bg_used_dirs_count_lo) | 187560671a0SAneesh Kumar K.V (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 188560671a0SAneesh Kumar K.V (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0); 189560671a0SAneesh Kumar K.V } 190560671a0SAneesh Kumar K.V 191560671a0SAneesh Kumar K.V __u32 ext4_itable_unused_count(struct super_block *sb, 192560671a0SAneesh Kumar K.V struct ext4_group_desc *bg) 193560671a0SAneesh Kumar K.V { 194560671a0SAneesh Kumar K.V return le16_to_cpu(bg->bg_itable_unused_lo) | 195560671a0SAneesh Kumar K.V (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 196560671a0SAneesh Kumar K.V (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0); 197560671a0SAneesh Kumar K.V } 198560671a0SAneesh Kumar K.V 1998fadc143SAlexandre Ratchov void ext4_block_bitmap_set(struct super_block *sb, 2008fadc143SAlexandre Ratchov struct ext4_group_desc *bg, ext4_fsblk_t blk) 201bd81d8eeSLaurent Vivier { 2023a14589cSAneesh Kumar K.V bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); 2038fadc143SAlexandre Ratchov if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 2048fadc143SAlexandre Ratchov bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); 205bd81d8eeSLaurent Vivier } 206bd81d8eeSLaurent Vivier 2078fadc143SAlexandre Ratchov void ext4_inode_bitmap_set(struct super_block *sb, 2088fadc143SAlexandre Ratchov struct ext4_group_desc *bg, ext4_fsblk_t blk) 209bd81d8eeSLaurent Vivier { 2105272f837SAneesh Kumar K.V bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); 2118fadc143SAlexandre Ratchov if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 2128fadc143SAlexandre Ratchov bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); 213bd81d8eeSLaurent Vivier } 214bd81d8eeSLaurent Vivier 2158fadc143SAlexandre Ratchov void ext4_inode_table_set(struct super_block *sb, 2168fadc143SAlexandre Ratchov struct ext4_group_desc *bg, ext4_fsblk_t blk) 217bd81d8eeSLaurent Vivier { 2185272f837SAneesh Kumar K.V bg->bg_inode_table_lo = cpu_to_le32((u32)blk); 2198fadc143SAlexandre Ratchov if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 2208fadc143SAlexandre Ratchov bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); 221bd81d8eeSLaurent Vivier } 222bd81d8eeSLaurent Vivier 223021b65bbSTheodore Ts'o void ext4_free_group_clusters_set(struct super_block *sb, 224560671a0SAneesh Kumar K.V struct ext4_group_desc *bg, __u32 count) 225560671a0SAneesh Kumar K.V { 226560671a0SAneesh Kumar K.V bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count); 227560671a0SAneesh Kumar K.V if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 228560671a0SAneesh Kumar K.V bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16); 229560671a0SAneesh Kumar K.V } 230560671a0SAneesh Kumar K.V 231560671a0SAneesh Kumar K.V void ext4_free_inodes_set(struct super_block *sb, 232560671a0SAneesh Kumar K.V struct ext4_group_desc *bg, __u32 count) 233560671a0SAneesh Kumar K.V { 234560671a0SAneesh Kumar K.V bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count); 235560671a0SAneesh Kumar K.V if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 236560671a0SAneesh Kumar K.V bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16); 237560671a0SAneesh Kumar K.V } 238560671a0SAneesh Kumar K.V 239560671a0SAneesh Kumar K.V void ext4_used_dirs_set(struct super_block *sb, 240560671a0SAneesh Kumar K.V struct ext4_group_desc *bg, __u32 count) 241560671a0SAneesh Kumar K.V { 242560671a0SAneesh Kumar K.V bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count); 243560671a0SAneesh Kumar K.V if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 244560671a0SAneesh Kumar K.V bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16); 245560671a0SAneesh Kumar K.V } 246560671a0SAneesh Kumar K.V 247560671a0SAneesh Kumar K.V void ext4_itable_unused_set(struct super_block *sb, 248560671a0SAneesh Kumar K.V struct ext4_group_desc *bg, __u32 count) 249560671a0SAneesh Kumar K.V { 250560671a0SAneesh Kumar K.V bg->bg_itable_unused_lo = cpu_to_le16((__u16)count); 251560671a0SAneesh Kumar K.V if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 252560671a0SAneesh Kumar K.V bg->bg_itable_unused_hi = cpu_to_le16(count >> 16); 253560671a0SAneesh Kumar K.V } 254560671a0SAneesh Kumar K.V 255d3d1faf6SCurt Wohlgemuth 256d3d1faf6SCurt Wohlgemuth /* Just increment the non-pointer handle value */ 257d3d1faf6SCurt Wohlgemuth static handle_t *ext4_get_nojournal(void) 258d3d1faf6SCurt Wohlgemuth { 259d3d1faf6SCurt Wohlgemuth handle_t *handle = current->journal_info; 260d3d1faf6SCurt Wohlgemuth unsigned long ref_cnt = (unsigned long)handle; 261d3d1faf6SCurt Wohlgemuth 262d3d1faf6SCurt Wohlgemuth BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT); 263d3d1faf6SCurt Wohlgemuth 264d3d1faf6SCurt Wohlgemuth ref_cnt++; 265d3d1faf6SCurt Wohlgemuth handle = (handle_t *)ref_cnt; 266d3d1faf6SCurt Wohlgemuth 267d3d1faf6SCurt Wohlgemuth current->journal_info = handle; 268d3d1faf6SCurt Wohlgemuth return handle; 269d3d1faf6SCurt Wohlgemuth } 270d3d1faf6SCurt Wohlgemuth 271d3d1faf6SCurt Wohlgemuth 272d3d1faf6SCurt Wohlgemuth /* Decrement the non-pointer handle value */ 273d3d1faf6SCurt Wohlgemuth static void ext4_put_nojournal(handle_t *handle) 274d3d1faf6SCurt Wohlgemuth { 275d3d1faf6SCurt Wohlgemuth unsigned long ref_cnt = (unsigned long)handle; 276d3d1faf6SCurt Wohlgemuth 277d3d1faf6SCurt Wohlgemuth BUG_ON(ref_cnt == 0); 278d3d1faf6SCurt Wohlgemuth 279d3d1faf6SCurt Wohlgemuth ref_cnt--; 280d3d1faf6SCurt Wohlgemuth handle = (handle_t *)ref_cnt; 281d3d1faf6SCurt Wohlgemuth 282d3d1faf6SCurt Wohlgemuth current->journal_info = handle; 283d3d1faf6SCurt Wohlgemuth } 284d3d1faf6SCurt Wohlgemuth 285ac27a0ecSDave Kleikamp /* 286dab291afSMingming Cao * Wrappers for jbd2_journal_start/end. 287ac27a0ecSDave Kleikamp * 288ac27a0ecSDave Kleikamp * The only special thing we need to do here is to make sure that all 289ac27a0ecSDave Kleikamp * journal_end calls result in the superblock being marked dirty, so 290ac27a0ecSDave Kleikamp * that sync() will call the filesystem's write_super callback if 291ac27a0ecSDave Kleikamp * appropriate. 292be4f27d3SYongqiang Yang * 293be4f27d3SYongqiang Yang * To avoid j_barrier hold in userspace when a user calls freeze(), 294be4f27d3SYongqiang Yang * ext4 prevents a new handle from being started by s_frozen, which 295be4f27d3SYongqiang Yang * is in an upper layer. 296ac27a0ecSDave Kleikamp */ 297617ba13bSMingming Cao handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) 298ac27a0ecSDave Kleikamp { 299ac27a0ecSDave Kleikamp journal_t *journal; 300be4f27d3SYongqiang Yang handle_t *handle; 301ac27a0ecSDave Kleikamp 30212706394STheodore Ts'o trace_ext4_journal_start(sb, nblocks, _RET_IP_); 303ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) 304ac27a0ecSDave Kleikamp return ERR_PTR(-EROFS); 305ac27a0ecSDave Kleikamp 306617ba13bSMingming Cao journal = EXT4_SB(sb)->s_journal; 307be4f27d3SYongqiang Yang handle = ext4_journal_current_handle(); 308be4f27d3SYongqiang Yang 309be4f27d3SYongqiang Yang /* 310be4f27d3SYongqiang Yang * If a handle has been started, it should be allowed to 311be4f27d3SYongqiang Yang * finish, otherwise deadlock could happen between freeze 312be4f27d3SYongqiang Yang * and others(e.g. truncate) due to the restart of the 313be4f27d3SYongqiang Yang * journal handle if the filesystem is forzen and active 314be4f27d3SYongqiang Yang * handles are not stopped. 315be4f27d3SYongqiang Yang */ 316be4f27d3SYongqiang Yang if (!handle) 317be4f27d3SYongqiang Yang vfs_check_frozen(sb, SB_FREEZE_TRANS); 318be4f27d3SYongqiang Yang 319be4f27d3SYongqiang Yang if (!journal) 320be4f27d3SYongqiang Yang return ext4_get_nojournal(); 321be4f27d3SYongqiang Yang /* 322be4f27d3SYongqiang Yang * Special case here: if the journal has aborted behind our 323be4f27d3SYongqiang Yang * backs (eg. EIO in the commit thread), then we still need to 324be4f27d3SYongqiang Yang * take the FS itself readonly cleanly. 325be4f27d3SYongqiang Yang */ 326ac27a0ecSDave Kleikamp if (is_journal_aborted(journal)) { 327c67d859eSTheodore Ts'o ext4_abort(sb, "Detected aborted journal"); 328ac27a0ecSDave Kleikamp return ERR_PTR(-EROFS); 329ac27a0ecSDave Kleikamp } 330dab291afSMingming Cao return jbd2_journal_start(journal, nblocks); 331ac27a0ecSDave Kleikamp } 332ac27a0ecSDave Kleikamp 333ac27a0ecSDave Kleikamp /* 334ac27a0ecSDave Kleikamp * The only special thing we need to do here is to make sure that all 335dab291afSMingming Cao * jbd2_journal_stop calls result in the superblock being marked dirty, so 336ac27a0ecSDave Kleikamp * that sync() will call the filesystem's write_super callback if 337ac27a0ecSDave Kleikamp * appropriate. 338ac27a0ecSDave Kleikamp */ 339c398eda0STheodore Ts'o int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle) 340ac27a0ecSDave Kleikamp { 341ac27a0ecSDave Kleikamp struct super_block *sb; 342ac27a0ecSDave Kleikamp int err; 343ac27a0ecSDave Kleikamp int rc; 344ac27a0ecSDave Kleikamp 3450390131bSFrank Mayhar if (!ext4_handle_valid(handle)) { 346d3d1faf6SCurt Wohlgemuth ext4_put_nojournal(handle); 3470390131bSFrank Mayhar return 0; 3480390131bSFrank Mayhar } 349ac27a0ecSDave Kleikamp sb = handle->h_transaction->t_journal->j_private; 350ac27a0ecSDave Kleikamp err = handle->h_err; 351dab291afSMingming Cao rc = jbd2_journal_stop(handle); 352ac27a0ecSDave Kleikamp 353ac27a0ecSDave Kleikamp if (!err) 354ac27a0ecSDave Kleikamp err = rc; 355ac27a0ecSDave Kleikamp if (err) 356c398eda0STheodore Ts'o __ext4_std_error(sb, where, line, err); 357ac27a0ecSDave Kleikamp return err; 358ac27a0ecSDave Kleikamp } 359ac27a0ecSDave Kleikamp 36090c7201bSTheodore Ts'o void ext4_journal_abort_handle(const char *caller, unsigned int line, 36190c7201bSTheodore Ts'o const char *err_fn, struct buffer_head *bh, 36290c7201bSTheodore Ts'o handle_t *handle, int err) 363ac27a0ecSDave Kleikamp { 364ac27a0ecSDave Kleikamp char nbuf[16]; 365617ba13bSMingming Cao const char *errstr = ext4_decode_error(NULL, err, nbuf); 366ac27a0ecSDave Kleikamp 3670390131bSFrank Mayhar BUG_ON(!ext4_handle_valid(handle)); 3680390131bSFrank Mayhar 369ac27a0ecSDave Kleikamp if (bh) 370ac27a0ecSDave Kleikamp BUFFER_TRACE(bh, "abort"); 371ac27a0ecSDave Kleikamp 372ac27a0ecSDave Kleikamp if (!handle->h_err) 373ac27a0ecSDave Kleikamp handle->h_err = err; 374ac27a0ecSDave Kleikamp 375ac27a0ecSDave Kleikamp if (is_handle_aborted(handle)) 376ac27a0ecSDave Kleikamp return; 377ac27a0ecSDave Kleikamp 37890c7201bSTheodore Ts'o printk(KERN_ERR "%s:%d: aborting transaction: %s in %s\n", 37990c7201bSTheodore Ts'o caller, line, errstr, err_fn); 380ac27a0ecSDave Kleikamp 381dab291afSMingming Cao jbd2_journal_abort_handle(handle); 382ac27a0ecSDave Kleikamp } 383ac27a0ecSDave Kleikamp 3841c13d5c0STheodore Ts'o static void __save_error_info(struct super_block *sb, const char *func, 3851c13d5c0STheodore Ts'o unsigned int line) 3861c13d5c0STheodore Ts'o { 3871c13d5c0STheodore Ts'o struct ext4_super_block *es = EXT4_SB(sb)->s_es; 3881c13d5c0STheodore Ts'o 3891c13d5c0STheodore Ts'o EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 3901c13d5c0STheodore Ts'o es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 3911c13d5c0STheodore Ts'o es->s_last_error_time = cpu_to_le32(get_seconds()); 3921c13d5c0STheodore Ts'o strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func)); 3931c13d5c0STheodore Ts'o es->s_last_error_line = cpu_to_le32(line); 3941c13d5c0STheodore Ts'o if (!es->s_first_error_time) { 3951c13d5c0STheodore Ts'o es->s_first_error_time = es->s_last_error_time; 3961c13d5c0STheodore Ts'o strncpy(es->s_first_error_func, func, 3971c13d5c0STheodore Ts'o sizeof(es->s_first_error_func)); 3981c13d5c0STheodore Ts'o es->s_first_error_line = cpu_to_le32(line); 3991c13d5c0STheodore Ts'o es->s_first_error_ino = es->s_last_error_ino; 4001c13d5c0STheodore Ts'o es->s_first_error_block = es->s_last_error_block; 4011c13d5c0STheodore Ts'o } 40266e61a9eSTheodore Ts'o /* 40366e61a9eSTheodore Ts'o * Start the daily error reporting function if it hasn't been 40466e61a9eSTheodore Ts'o * started already 40566e61a9eSTheodore Ts'o */ 40666e61a9eSTheodore Ts'o if (!es->s_error_count) 40766e61a9eSTheodore Ts'o mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ); 4081c13d5c0STheodore Ts'o es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1); 4091c13d5c0STheodore Ts'o } 4101c13d5c0STheodore Ts'o 4111c13d5c0STheodore Ts'o static void save_error_info(struct super_block *sb, const char *func, 4121c13d5c0STheodore Ts'o unsigned int line) 4131c13d5c0STheodore Ts'o { 4141c13d5c0STheodore Ts'o __save_error_info(sb, func, line); 4151c13d5c0STheodore Ts'o ext4_commit_super(sb, 1); 4161c13d5c0STheodore Ts'o } 4171c13d5c0STheodore Ts'o 4187c2e7087STheodore Ts'o /* 4197c2e7087STheodore Ts'o * The del_gendisk() function uninitializes the disk-specific data 4207c2e7087STheodore Ts'o * structures, including the bdi structure, without telling anyone 4217c2e7087STheodore Ts'o * else. Once this happens, any attempt to call mark_buffer_dirty() 4227c2e7087STheodore Ts'o * (for example, by ext4_commit_super), will cause a kernel OOPS. 4237c2e7087STheodore Ts'o * This is a kludge to prevent these oops until we can put in a proper 4247c2e7087STheodore Ts'o * hook in del_gendisk() to inform the VFS and file system layers. 4257c2e7087STheodore Ts'o */ 4267c2e7087STheodore Ts'o static int block_device_ejected(struct super_block *sb) 4277c2e7087STheodore Ts'o { 4287c2e7087STheodore Ts'o struct inode *bd_inode = sb->s_bdev->bd_inode; 4297c2e7087STheodore Ts'o struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info; 4307c2e7087STheodore Ts'o 4317c2e7087STheodore Ts'o return bdi->dev == NULL; 4327c2e7087STheodore Ts'o } 4337c2e7087STheodore Ts'o 43418aadd47SBobi Jam static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn) 43518aadd47SBobi Jam { 43618aadd47SBobi Jam struct super_block *sb = journal->j_private; 43718aadd47SBobi Jam struct ext4_sb_info *sbi = EXT4_SB(sb); 43818aadd47SBobi Jam int error = is_journal_aborted(journal); 43918aadd47SBobi Jam struct ext4_journal_cb_entry *jce, *tmp; 44018aadd47SBobi Jam 44118aadd47SBobi Jam spin_lock(&sbi->s_md_lock); 44218aadd47SBobi Jam list_for_each_entry_safe(jce, tmp, &txn->t_private_list, jce_list) { 44318aadd47SBobi Jam list_del_init(&jce->jce_list); 44418aadd47SBobi Jam spin_unlock(&sbi->s_md_lock); 44518aadd47SBobi Jam jce->jce_func(sb, jce, error); 44618aadd47SBobi Jam spin_lock(&sbi->s_md_lock); 44718aadd47SBobi Jam } 44818aadd47SBobi Jam spin_unlock(&sbi->s_md_lock); 44918aadd47SBobi Jam } 4501c13d5c0STheodore Ts'o 451ac27a0ecSDave Kleikamp /* Deal with the reporting of failure conditions on a filesystem such as 452ac27a0ecSDave Kleikamp * inconsistencies detected or read IO failures. 453ac27a0ecSDave Kleikamp * 454ac27a0ecSDave Kleikamp * On ext2, we can store the error state of the filesystem in the 455617ba13bSMingming Cao * superblock. That is not possible on ext4, because we may have other 456ac27a0ecSDave Kleikamp * write ordering constraints on the superblock which prevent us from 457ac27a0ecSDave Kleikamp * writing it out straight away; and given that the journal is about to 458ac27a0ecSDave Kleikamp * be aborted, we can't rely on the current, or future, transactions to 459ac27a0ecSDave Kleikamp * write out the superblock safely. 460ac27a0ecSDave Kleikamp * 461dab291afSMingming Cao * We'll just use the jbd2_journal_abort() error code to record an error in 462d6b198bcSThadeu Lima de Souza Cascardo * the journal instead. On recovery, the journal will complain about 463ac27a0ecSDave Kleikamp * that error until we've noted it down and cleared it. 464ac27a0ecSDave Kleikamp */ 465ac27a0ecSDave Kleikamp 466617ba13bSMingming Cao static void ext4_handle_error(struct super_block *sb) 467ac27a0ecSDave Kleikamp { 468ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) 469ac27a0ecSDave Kleikamp return; 470ac27a0ecSDave Kleikamp 471ac27a0ecSDave Kleikamp if (!test_opt(sb, ERRORS_CONT)) { 472617ba13bSMingming Cao journal_t *journal = EXT4_SB(sb)->s_journal; 473ac27a0ecSDave Kleikamp 4744ab2f15bSTheodore Ts'o EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; 475ac27a0ecSDave Kleikamp if (journal) 476dab291afSMingming Cao jbd2_journal_abort(journal, -EIO); 477ac27a0ecSDave Kleikamp } 478ac27a0ecSDave Kleikamp if (test_opt(sb, ERRORS_RO)) { 479b31e1552SEric Sandeen ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); 480ac27a0ecSDave Kleikamp sb->s_flags |= MS_RDONLY; 481ac27a0ecSDave Kleikamp } 482ac27a0ecSDave Kleikamp if (test_opt(sb, ERRORS_PANIC)) 483617ba13bSMingming Cao panic("EXT4-fs (device %s): panic forced after error\n", 484ac27a0ecSDave Kleikamp sb->s_id); 485ac27a0ecSDave Kleikamp } 486ac27a0ecSDave Kleikamp 48712062dddSEric Sandeen void __ext4_error(struct super_block *sb, const char *function, 488c398eda0STheodore Ts'o unsigned int line, const char *fmt, ...) 489ac27a0ecSDave Kleikamp { 4900ff2ea7dSJoe Perches struct va_format vaf; 491ac27a0ecSDave Kleikamp va_list args; 492ac27a0ecSDave Kleikamp 493ac27a0ecSDave Kleikamp va_start(args, fmt); 4940ff2ea7dSJoe Perches vaf.fmt = fmt; 4950ff2ea7dSJoe Perches vaf.va = &args; 4960ff2ea7dSJoe Perches printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n", 4970ff2ea7dSJoe Perches sb->s_id, function, line, current->comm, &vaf); 498ac27a0ecSDave Kleikamp va_end(args); 499ac27a0ecSDave Kleikamp 500617ba13bSMingming Cao ext4_handle_error(sb); 501ac27a0ecSDave Kleikamp } 502ac27a0ecSDave Kleikamp 503c398eda0STheodore Ts'o void ext4_error_inode(struct inode *inode, const char *function, 504c398eda0STheodore Ts'o unsigned int line, ext4_fsblk_t block, 505273df556SFrank Mayhar const char *fmt, ...) 506273df556SFrank Mayhar { 507273df556SFrank Mayhar va_list args; 508f7c21177STheodore Ts'o struct va_format vaf; 5091c13d5c0STheodore Ts'o struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es; 510273df556SFrank Mayhar 5111c13d5c0STheodore Ts'o es->s_last_error_ino = cpu_to_le32(inode->i_ino); 5121c13d5c0STheodore Ts'o es->s_last_error_block = cpu_to_le64(block); 5131c13d5c0STheodore Ts'o save_error_info(inode->i_sb, function, line); 514273df556SFrank Mayhar va_start(args, fmt); 515f7c21177STheodore Ts'o vaf.fmt = fmt; 516f7c21177STheodore Ts'o vaf.va = &args; 517c398eda0STheodore Ts'o printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: inode #%lu: ", 518c398eda0STheodore Ts'o inode->i_sb->s_id, function, line, inode->i_ino); 519c398eda0STheodore Ts'o if (block) 520f7c21177STheodore Ts'o printk(KERN_CONT "block %llu: ", block); 521f7c21177STheodore Ts'o printk(KERN_CONT "comm %s: %pV\n", current->comm, &vaf); 522273df556SFrank Mayhar va_end(args); 523273df556SFrank Mayhar 524273df556SFrank Mayhar ext4_handle_error(inode->i_sb); 525273df556SFrank Mayhar } 526273df556SFrank Mayhar 527c398eda0STheodore Ts'o void ext4_error_file(struct file *file, const char *function, 528f7c21177STheodore Ts'o unsigned int line, ext4_fsblk_t block, 529f7c21177STheodore Ts'o const char *fmt, ...) 530273df556SFrank Mayhar { 531273df556SFrank Mayhar va_list args; 532f7c21177STheodore Ts'o struct va_format vaf; 5331c13d5c0STheodore Ts'o struct ext4_super_block *es; 534273df556SFrank Mayhar struct inode *inode = file->f_dentry->d_inode; 535273df556SFrank Mayhar char pathname[80], *path; 536273df556SFrank Mayhar 5371c13d5c0STheodore Ts'o es = EXT4_SB(inode->i_sb)->s_es; 5381c13d5c0STheodore Ts'o es->s_last_error_ino = cpu_to_le32(inode->i_ino); 5391c13d5c0STheodore Ts'o save_error_info(inode->i_sb, function, line); 540273df556SFrank Mayhar path = d_path(&(file->f_path), pathname, sizeof(pathname)); 541f9a62d09SDan Carpenter if (IS_ERR(path)) 542273df556SFrank Mayhar path = "(unknown)"; 543273df556SFrank Mayhar printk(KERN_CRIT 544f7c21177STheodore Ts'o "EXT4-fs error (device %s): %s:%d: inode #%lu: ", 545f7c21177STheodore Ts'o inode->i_sb->s_id, function, line, inode->i_ino); 546f7c21177STheodore Ts'o if (block) 547f7c21177STheodore Ts'o printk(KERN_CONT "block %llu: ", block); 548f7c21177STheodore Ts'o va_start(args, fmt); 549f7c21177STheodore Ts'o vaf.fmt = fmt; 550f7c21177STheodore Ts'o vaf.va = &args; 551f7c21177STheodore Ts'o printk(KERN_CONT "comm %s: path %s: %pV\n", current->comm, path, &vaf); 552273df556SFrank Mayhar va_end(args); 553273df556SFrank Mayhar 554273df556SFrank Mayhar ext4_handle_error(inode->i_sb); 555273df556SFrank Mayhar } 556273df556SFrank Mayhar 557617ba13bSMingming Cao static const char *ext4_decode_error(struct super_block *sb, int errno, 558ac27a0ecSDave Kleikamp char nbuf[16]) 559ac27a0ecSDave Kleikamp { 560ac27a0ecSDave Kleikamp char *errstr = NULL; 561ac27a0ecSDave Kleikamp 562ac27a0ecSDave Kleikamp switch (errno) { 563ac27a0ecSDave Kleikamp case -EIO: 564ac27a0ecSDave Kleikamp errstr = "IO failure"; 565ac27a0ecSDave Kleikamp break; 566ac27a0ecSDave Kleikamp case -ENOMEM: 567ac27a0ecSDave Kleikamp errstr = "Out of memory"; 568ac27a0ecSDave Kleikamp break; 569ac27a0ecSDave Kleikamp case -EROFS: 57078f1ddbbSTheodore Ts'o if (!sb || (EXT4_SB(sb)->s_journal && 57178f1ddbbSTheodore Ts'o EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)) 572ac27a0ecSDave Kleikamp errstr = "Journal has aborted"; 573ac27a0ecSDave Kleikamp else 574ac27a0ecSDave Kleikamp errstr = "Readonly filesystem"; 575ac27a0ecSDave Kleikamp break; 576ac27a0ecSDave Kleikamp default: 577ac27a0ecSDave Kleikamp /* If the caller passed in an extra buffer for unknown 578ac27a0ecSDave Kleikamp * errors, textualise them now. Else we just return 579ac27a0ecSDave Kleikamp * NULL. */ 580ac27a0ecSDave Kleikamp if (nbuf) { 581ac27a0ecSDave Kleikamp /* Check for truncated error codes... */ 582ac27a0ecSDave Kleikamp if (snprintf(nbuf, 16, "error %d", -errno) >= 0) 583ac27a0ecSDave Kleikamp errstr = nbuf; 584ac27a0ecSDave Kleikamp } 585ac27a0ecSDave Kleikamp break; 586ac27a0ecSDave Kleikamp } 587ac27a0ecSDave Kleikamp 588ac27a0ecSDave Kleikamp return errstr; 589ac27a0ecSDave Kleikamp } 590ac27a0ecSDave Kleikamp 591617ba13bSMingming Cao /* __ext4_std_error decodes expected errors from journaling functions 592ac27a0ecSDave Kleikamp * automatically and invokes the appropriate error response. */ 593ac27a0ecSDave Kleikamp 594c398eda0STheodore Ts'o void __ext4_std_error(struct super_block *sb, const char *function, 595c398eda0STheodore Ts'o unsigned int line, int errno) 596ac27a0ecSDave Kleikamp { 597ac27a0ecSDave Kleikamp char nbuf[16]; 598ac27a0ecSDave Kleikamp const char *errstr; 599ac27a0ecSDave Kleikamp 600ac27a0ecSDave Kleikamp /* Special case: if the error is EROFS, and we're not already 601ac27a0ecSDave Kleikamp * inside a transaction, then there's really no point in logging 602ac27a0ecSDave Kleikamp * an error. */ 603ac27a0ecSDave Kleikamp if (errno == -EROFS && journal_current_handle() == NULL && 604ac27a0ecSDave Kleikamp (sb->s_flags & MS_RDONLY)) 605ac27a0ecSDave Kleikamp return; 606ac27a0ecSDave Kleikamp 607617ba13bSMingming Cao errstr = ext4_decode_error(sb, errno, nbuf); 608c398eda0STheodore Ts'o printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n", 609c398eda0STheodore Ts'o sb->s_id, function, line, errstr); 6101c13d5c0STheodore Ts'o save_error_info(sb, function, line); 611ac27a0ecSDave Kleikamp 612617ba13bSMingming Cao ext4_handle_error(sb); 613ac27a0ecSDave Kleikamp } 614ac27a0ecSDave Kleikamp 615ac27a0ecSDave Kleikamp /* 616617ba13bSMingming Cao * ext4_abort is a much stronger failure handler than ext4_error. The 617ac27a0ecSDave Kleikamp * abort function may be used to deal with unrecoverable failures such 618ac27a0ecSDave Kleikamp * as journal IO errors or ENOMEM at a critical moment in log management. 619ac27a0ecSDave Kleikamp * 620ac27a0ecSDave Kleikamp * We unconditionally force the filesystem into an ABORT|READONLY state, 621ac27a0ecSDave Kleikamp * unless the error response on the fs has been set to panic in which 622ac27a0ecSDave Kleikamp * case we take the easy way out and panic immediately. 623ac27a0ecSDave Kleikamp */ 624ac27a0ecSDave Kleikamp 625c67d859eSTheodore Ts'o void __ext4_abort(struct super_block *sb, const char *function, 626c398eda0STheodore Ts'o unsigned int line, const char *fmt, ...) 627ac27a0ecSDave Kleikamp { 628ac27a0ecSDave Kleikamp va_list args; 629ac27a0ecSDave Kleikamp 6301c13d5c0STheodore Ts'o save_error_info(sb, function, line); 631ac27a0ecSDave Kleikamp va_start(args, fmt); 632c398eda0STheodore Ts'o printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id, 633c398eda0STheodore Ts'o function, line); 634ac27a0ecSDave Kleikamp vprintk(fmt, args); 635ac27a0ecSDave Kleikamp printk("\n"); 636ac27a0ecSDave Kleikamp va_end(args); 637ac27a0ecSDave Kleikamp 6381c13d5c0STheodore Ts'o if ((sb->s_flags & MS_RDONLY) == 0) { 639b31e1552SEric Sandeen ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); 640ac27a0ecSDave Kleikamp sb->s_flags |= MS_RDONLY; 6414ab2f15bSTheodore Ts'o EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; 642ef2cabf7SHidehiro Kawai if (EXT4_SB(sb)->s_journal) 643dab291afSMingming Cao jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); 6441c13d5c0STheodore Ts'o save_error_info(sb, function, line); 6451c13d5c0STheodore Ts'o } 6461c13d5c0STheodore Ts'o if (test_opt(sb, ERRORS_PANIC)) 6471c13d5c0STheodore Ts'o panic("EXT4-fs panic from previous error\n"); 648ac27a0ecSDave Kleikamp } 649ac27a0ecSDave Kleikamp 6500ff2ea7dSJoe Perches void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...) 651b31e1552SEric Sandeen { 6520ff2ea7dSJoe Perches struct va_format vaf; 653b31e1552SEric Sandeen va_list args; 654b31e1552SEric Sandeen 655b31e1552SEric Sandeen va_start(args, fmt); 6560ff2ea7dSJoe Perches vaf.fmt = fmt; 6570ff2ea7dSJoe Perches vaf.va = &args; 6580ff2ea7dSJoe Perches printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf); 659b31e1552SEric Sandeen va_end(args); 660b31e1552SEric Sandeen } 661b31e1552SEric Sandeen 66212062dddSEric Sandeen void __ext4_warning(struct super_block *sb, const char *function, 663c398eda0STheodore Ts'o unsigned int line, const char *fmt, ...) 664ac27a0ecSDave Kleikamp { 6650ff2ea7dSJoe Perches struct va_format vaf; 666ac27a0ecSDave Kleikamp va_list args; 667ac27a0ecSDave Kleikamp 668ac27a0ecSDave Kleikamp va_start(args, fmt); 6690ff2ea7dSJoe Perches vaf.fmt = fmt; 6700ff2ea7dSJoe Perches vaf.va = &args; 6710ff2ea7dSJoe Perches printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n", 6720ff2ea7dSJoe Perches sb->s_id, function, line, &vaf); 673ac27a0ecSDave Kleikamp va_end(args); 674ac27a0ecSDave Kleikamp } 675ac27a0ecSDave Kleikamp 676e29136f8STheodore Ts'o void __ext4_grp_locked_error(const char *function, unsigned int line, 677e29136f8STheodore Ts'o struct super_block *sb, ext4_group_t grp, 678e29136f8STheodore Ts'o unsigned long ino, ext4_fsblk_t block, 679e29136f8STheodore Ts'o const char *fmt, ...) 6805d1b1b3fSAneesh Kumar K.V __releases(bitlock) 6815d1b1b3fSAneesh Kumar K.V __acquires(bitlock) 6825d1b1b3fSAneesh Kumar K.V { 6830ff2ea7dSJoe Perches struct va_format vaf; 6845d1b1b3fSAneesh Kumar K.V va_list args; 6855d1b1b3fSAneesh Kumar K.V struct ext4_super_block *es = EXT4_SB(sb)->s_es; 6865d1b1b3fSAneesh Kumar K.V 6871c13d5c0STheodore Ts'o es->s_last_error_ino = cpu_to_le32(ino); 6881c13d5c0STheodore Ts'o es->s_last_error_block = cpu_to_le64(block); 6891c13d5c0STheodore Ts'o __save_error_info(sb, function, line); 6900ff2ea7dSJoe Perches 6915d1b1b3fSAneesh Kumar K.V va_start(args, fmt); 6920ff2ea7dSJoe Perches 6930ff2ea7dSJoe Perches vaf.fmt = fmt; 6940ff2ea7dSJoe Perches vaf.va = &args; 69521149d61SRobin Dong printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ", 696e29136f8STheodore Ts'o sb->s_id, function, line, grp); 697e29136f8STheodore Ts'o if (ino) 6980ff2ea7dSJoe Perches printk(KERN_CONT "inode %lu: ", ino); 699e29136f8STheodore Ts'o if (block) 7000ff2ea7dSJoe Perches printk(KERN_CONT "block %llu:", (unsigned long long) block); 7010ff2ea7dSJoe Perches printk(KERN_CONT "%pV\n", &vaf); 7025d1b1b3fSAneesh Kumar K.V va_end(args); 7035d1b1b3fSAneesh Kumar K.V 7045d1b1b3fSAneesh Kumar K.V if (test_opt(sb, ERRORS_CONT)) { 705e2d67052STheodore Ts'o ext4_commit_super(sb, 0); 7065d1b1b3fSAneesh Kumar K.V return; 7075d1b1b3fSAneesh Kumar K.V } 7081c13d5c0STheodore Ts'o 7095d1b1b3fSAneesh Kumar K.V ext4_unlock_group(sb, grp); 7105d1b1b3fSAneesh Kumar K.V ext4_handle_error(sb); 7115d1b1b3fSAneesh Kumar K.V /* 7125d1b1b3fSAneesh Kumar K.V * We only get here in the ERRORS_RO case; relocking the group 7135d1b1b3fSAneesh Kumar K.V * may be dangerous, but nothing bad will happen since the 7145d1b1b3fSAneesh Kumar K.V * filesystem will have already been marked read/only and the 7155d1b1b3fSAneesh Kumar K.V * journal has been aborted. We return 1 as a hint to callers 7165d1b1b3fSAneesh Kumar K.V * who might what to use the return value from 71725985edcSLucas De Marchi * ext4_grp_locked_error() to distinguish between the 7185d1b1b3fSAneesh Kumar K.V * ERRORS_CONT and ERRORS_RO case, and perhaps return more 7195d1b1b3fSAneesh Kumar K.V * aggressively from the ext4 function in question, with a 7205d1b1b3fSAneesh Kumar K.V * more appropriate error code. 7215d1b1b3fSAneesh Kumar K.V */ 7225d1b1b3fSAneesh Kumar K.V ext4_lock_group(sb, grp); 7235d1b1b3fSAneesh Kumar K.V return; 7245d1b1b3fSAneesh Kumar K.V } 7255d1b1b3fSAneesh Kumar K.V 726617ba13bSMingming Cao void ext4_update_dynamic_rev(struct super_block *sb) 727ac27a0ecSDave Kleikamp { 728617ba13bSMingming Cao struct ext4_super_block *es = EXT4_SB(sb)->s_es; 729ac27a0ecSDave Kleikamp 730617ba13bSMingming Cao if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) 731ac27a0ecSDave Kleikamp return; 732ac27a0ecSDave Kleikamp 73312062dddSEric Sandeen ext4_warning(sb, 734ac27a0ecSDave Kleikamp "updating to rev %d because of new feature flag, " 735ac27a0ecSDave Kleikamp "running e2fsck is recommended", 736617ba13bSMingming Cao EXT4_DYNAMIC_REV); 737ac27a0ecSDave Kleikamp 738617ba13bSMingming Cao es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); 739617ba13bSMingming Cao es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); 740617ba13bSMingming Cao es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); 741ac27a0ecSDave Kleikamp /* leave es->s_feature_*compat flags alone */ 742ac27a0ecSDave Kleikamp /* es->s_uuid will be set by e2fsck if empty */ 743ac27a0ecSDave Kleikamp 744ac27a0ecSDave Kleikamp /* 745ac27a0ecSDave Kleikamp * The rest of the superblock fields should be zero, and if not it 746ac27a0ecSDave Kleikamp * means they are likely already in use, so leave them alone. We 747ac27a0ecSDave Kleikamp * can leave it up to e2fsck to clean up any inconsistencies there. 748ac27a0ecSDave Kleikamp */ 749ac27a0ecSDave Kleikamp } 750ac27a0ecSDave Kleikamp 751ac27a0ecSDave Kleikamp /* 752ac27a0ecSDave Kleikamp * Open the external journal device 753ac27a0ecSDave Kleikamp */ 754b31e1552SEric Sandeen static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb) 755ac27a0ecSDave Kleikamp { 756ac27a0ecSDave Kleikamp struct block_device *bdev; 757ac27a0ecSDave Kleikamp char b[BDEVNAME_SIZE]; 758ac27a0ecSDave Kleikamp 759d4d77629STejun Heo bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb); 760ac27a0ecSDave Kleikamp if (IS_ERR(bdev)) 761ac27a0ecSDave Kleikamp goto fail; 762ac27a0ecSDave Kleikamp return bdev; 763ac27a0ecSDave Kleikamp 764ac27a0ecSDave Kleikamp fail: 765b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld", 766ac27a0ecSDave Kleikamp __bdevname(dev, b), PTR_ERR(bdev)); 767ac27a0ecSDave Kleikamp return NULL; 768ac27a0ecSDave Kleikamp } 769ac27a0ecSDave Kleikamp 770ac27a0ecSDave Kleikamp /* 771ac27a0ecSDave Kleikamp * Release the journal device 772ac27a0ecSDave Kleikamp */ 773617ba13bSMingming Cao static int ext4_blkdev_put(struct block_device *bdev) 774ac27a0ecSDave Kleikamp { 775e525fd89STejun Heo return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); 776ac27a0ecSDave Kleikamp } 777ac27a0ecSDave Kleikamp 778617ba13bSMingming Cao static int ext4_blkdev_remove(struct ext4_sb_info *sbi) 779ac27a0ecSDave Kleikamp { 780ac27a0ecSDave Kleikamp struct block_device *bdev; 781ac27a0ecSDave Kleikamp int ret = -ENODEV; 782ac27a0ecSDave Kleikamp 783ac27a0ecSDave Kleikamp bdev = sbi->journal_bdev; 784ac27a0ecSDave Kleikamp if (bdev) { 785617ba13bSMingming Cao ret = ext4_blkdev_put(bdev); 786ac27a0ecSDave Kleikamp sbi->journal_bdev = NULL; 787ac27a0ecSDave Kleikamp } 788ac27a0ecSDave Kleikamp return ret; 789ac27a0ecSDave Kleikamp } 790ac27a0ecSDave Kleikamp 791ac27a0ecSDave Kleikamp static inline struct inode *orphan_list_entry(struct list_head *l) 792ac27a0ecSDave Kleikamp { 793617ba13bSMingming Cao return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; 794ac27a0ecSDave Kleikamp } 795ac27a0ecSDave Kleikamp 796617ba13bSMingming Cao static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) 797ac27a0ecSDave Kleikamp { 798ac27a0ecSDave Kleikamp struct list_head *l; 799ac27a0ecSDave Kleikamp 800b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "sb orphan head is %d", 801ac27a0ecSDave Kleikamp le32_to_cpu(sbi->s_es->s_last_orphan)); 802ac27a0ecSDave Kleikamp 803ac27a0ecSDave Kleikamp printk(KERN_ERR "sb_info orphan list:\n"); 804ac27a0ecSDave Kleikamp list_for_each(l, &sbi->s_orphan) { 805ac27a0ecSDave Kleikamp struct inode *inode = orphan_list_entry(l); 806ac27a0ecSDave Kleikamp printk(KERN_ERR " " 807ac27a0ecSDave Kleikamp "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", 808ac27a0ecSDave Kleikamp inode->i_sb->s_id, inode->i_ino, inode, 809ac27a0ecSDave Kleikamp inode->i_mode, inode->i_nlink, 810ac27a0ecSDave Kleikamp NEXT_ORPHAN(inode)); 811ac27a0ecSDave Kleikamp } 812ac27a0ecSDave Kleikamp } 813ac27a0ecSDave Kleikamp 814617ba13bSMingming Cao static void ext4_put_super(struct super_block *sb) 815ac27a0ecSDave Kleikamp { 816617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 817617ba13bSMingming Cao struct ext4_super_block *es = sbi->s_es; 818ef2cabf7SHidehiro Kawai int i, err; 819ac27a0ecSDave Kleikamp 820857ac889SLukas Czerner ext4_unregister_li_request(sb); 821e0ccfd95SChristoph Hellwig dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 822e0ccfd95SChristoph Hellwig 8234c0425ffSMingming Cao flush_workqueue(sbi->dio_unwritten_wq); 8244c0425ffSMingming Cao destroy_workqueue(sbi->dio_unwritten_wq); 8254c0425ffSMingming Cao 826a9e220f8SAl Viro lock_super(sb); 8278c85e125SChristoph Hellwig if (sb->s_dirt) 828ebc1ac16SChristoph Hellwig ext4_commit_super(sb, 1); 8298c85e125SChristoph Hellwig 8300390131bSFrank Mayhar if (sbi->s_journal) { 831ef2cabf7SHidehiro Kawai err = jbd2_journal_destroy(sbi->s_journal); 83247b4a50bSJan Kara sbi->s_journal = NULL; 833ef2cabf7SHidehiro Kawai if (err < 0) 834c67d859eSTheodore Ts'o ext4_abort(sb, "Couldn't clean up the journal"); 8350390131bSFrank Mayhar } 836d4edac31SJosef Bacik 837a1c6c569SSergey Senozhatsky del_timer(&sbi->s_err_report); 838d4edac31SJosef Bacik ext4_release_system_zone(sb); 839d4edac31SJosef Bacik ext4_mb_release(sb); 840d4edac31SJosef Bacik ext4_ext_release(sb); 841d4edac31SJosef Bacik ext4_xattr_put_super(sb); 842d4edac31SJosef Bacik 843ac27a0ecSDave Kleikamp if (!(sb->s_flags & MS_RDONLY)) { 844617ba13bSMingming Cao EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 845ac27a0ecSDave Kleikamp es->s_state = cpu_to_le16(sbi->s_mount_state); 846e2d67052STheodore Ts'o ext4_commit_super(sb, 1); 847ac27a0ecSDave Kleikamp } 848240799cdSTheodore Ts'o if (sbi->s_proc) { 8499f6200bbSTheodore Ts'o remove_proc_entry(sb->s_id, ext4_proc_root); 850240799cdSTheodore Ts'o } 8513197ebdbSTheodore Ts'o kobject_del(&sbi->s_kobj); 852ac27a0ecSDave Kleikamp 853ac27a0ecSDave Kleikamp for (i = 0; i < sbi->s_gdb_count; i++) 854ac27a0ecSDave Kleikamp brelse(sbi->s_group_desc[i]); 855f18a5f21STheodore Ts'o ext4_kvfree(sbi->s_group_desc); 8569933fc0aSTheodore Ts'o ext4_kvfree(sbi->s_flex_groups); 85757042651STheodore Ts'o percpu_counter_destroy(&sbi->s_freeclusters_counter); 858ac27a0ecSDave Kleikamp percpu_counter_destroy(&sbi->s_freeinodes_counter); 859ac27a0ecSDave Kleikamp percpu_counter_destroy(&sbi->s_dirs_counter); 86057042651STheodore Ts'o percpu_counter_destroy(&sbi->s_dirtyclusters_counter); 861ac27a0ecSDave Kleikamp brelse(sbi->s_sbh); 862ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 863ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) 864ac27a0ecSDave Kleikamp kfree(sbi->s_qf_names[i]); 865ac27a0ecSDave Kleikamp #endif 866ac27a0ecSDave Kleikamp 867ac27a0ecSDave Kleikamp /* Debugging code just in case the in-memory inode orphan list 868ac27a0ecSDave Kleikamp * isn't empty. The on-disk one can be non-empty if we've 869ac27a0ecSDave Kleikamp * detected an error and taken the fs readonly, but the 870ac27a0ecSDave Kleikamp * in-memory list had better be clean by this point. */ 871ac27a0ecSDave Kleikamp if (!list_empty(&sbi->s_orphan)) 872ac27a0ecSDave Kleikamp dump_orphan_list(sb, sbi); 873ac27a0ecSDave Kleikamp J_ASSERT(list_empty(&sbi->s_orphan)); 874ac27a0ecSDave Kleikamp 875f98393a6SPeter Zijlstra invalidate_bdev(sb->s_bdev); 876ac27a0ecSDave Kleikamp if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { 877ac27a0ecSDave Kleikamp /* 878ac27a0ecSDave Kleikamp * Invalidate the journal device's buffers. We don't want them 879ac27a0ecSDave Kleikamp * floating about in memory - the physical journal device may 880ac27a0ecSDave Kleikamp * hotswapped, and it breaks the `ro-after' testing code. 881ac27a0ecSDave Kleikamp */ 882ac27a0ecSDave Kleikamp sync_blockdev(sbi->journal_bdev); 883f98393a6SPeter Zijlstra invalidate_bdev(sbi->journal_bdev); 884617ba13bSMingming Cao ext4_blkdev_remove(sbi); 885ac27a0ecSDave Kleikamp } 886c5e06d10SJohann Lombardi if (sbi->s_mmp_tsk) 887c5e06d10SJohann Lombardi kthread_stop(sbi->s_mmp_tsk); 888ac27a0ecSDave Kleikamp sb->s_fs_info = NULL; 8893197ebdbSTheodore Ts'o /* 8903197ebdbSTheodore Ts'o * Now that we are completely done shutting down the 8913197ebdbSTheodore Ts'o * superblock, we need to actually destroy the kobject. 8923197ebdbSTheodore Ts'o */ 8933197ebdbSTheodore Ts'o unlock_super(sb); 8943197ebdbSTheodore Ts'o kobject_put(&sbi->s_kobj); 8953197ebdbSTheodore Ts'o wait_for_completion(&sbi->s_kobj_unregister); 896705895b6SPekka Enberg kfree(sbi->s_blockgroup_lock); 897ac27a0ecSDave Kleikamp kfree(sbi); 898ac27a0ecSDave Kleikamp } 899ac27a0ecSDave Kleikamp 900e18b890bSChristoph Lameter static struct kmem_cache *ext4_inode_cachep; 901ac27a0ecSDave Kleikamp 902ac27a0ecSDave Kleikamp /* 903ac27a0ecSDave Kleikamp * Called inside transaction, so use GFP_NOFS 904ac27a0ecSDave Kleikamp */ 905617ba13bSMingming Cao static struct inode *ext4_alloc_inode(struct super_block *sb) 906ac27a0ecSDave Kleikamp { 907617ba13bSMingming Cao struct ext4_inode_info *ei; 908ac27a0ecSDave Kleikamp 909e6b4f8daSChristoph Lameter ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); 910ac27a0ecSDave Kleikamp if (!ei) 911ac27a0ecSDave Kleikamp return NULL; 9120b8e58a1SAndreas Dilger 913ac27a0ecSDave Kleikamp ei->vfs_inode.i_version = 1; 91491246c00SAneesh Kumar K.V ei->vfs_inode.i_data.writeback_index = 0; 915a86c6181SAlex Tomas memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); 916c9de560dSAlex Tomas INIT_LIST_HEAD(&ei->i_prealloc_list); 917c9de560dSAlex Tomas spin_lock_init(&ei->i_prealloc_lock); 918d2a17637SMingming Cao ei->i_reserved_data_blocks = 0; 919d2a17637SMingming Cao ei->i_reserved_meta_blocks = 0; 920d2a17637SMingming Cao ei->i_allocated_meta_blocks = 0; 9219d0be502STheodore Ts'o ei->i_da_metadata_calc_len = 0; 922d2a17637SMingming Cao spin_lock_init(&(ei->i_block_reservation_lock)); 923a9e7f447SDmitry Monakhov #ifdef CONFIG_QUOTA 924a9e7f447SDmitry Monakhov ei->i_reserved_quota = 0; 925a9e7f447SDmitry Monakhov #endif 9268aefcd55STheodore Ts'o ei->jinode = NULL; 927c7064ef1SJiaying Zhang INIT_LIST_HEAD(&ei->i_completed_io_list); 928744692dcSJiaying Zhang spin_lock_init(&ei->i_completed_io_lock); 9298d5d02e6SMingming Cao ei->cur_aio_dio = NULL; 930b436b9beSJan Kara ei->i_sync_tid = 0; 931b436b9beSJan Kara ei->i_datasync_tid = 0; 932f7ad6d2eSTheodore Ts'o atomic_set(&ei->i_ioend_count, 0); 933e9e3bcecSEric Sandeen atomic_set(&ei->i_aiodio_unwritten, 0); 9340b8e58a1SAndreas Dilger 935ac27a0ecSDave Kleikamp return &ei->vfs_inode; 936ac27a0ecSDave Kleikamp } 937ac27a0ecSDave Kleikamp 9387ff9c073STheodore Ts'o static int ext4_drop_inode(struct inode *inode) 9397ff9c073STheodore Ts'o { 9407ff9c073STheodore Ts'o int drop = generic_drop_inode(inode); 9417ff9c073STheodore Ts'o 9427ff9c073STheodore Ts'o trace_ext4_drop_inode(inode, drop); 9437ff9c073STheodore Ts'o return drop; 9447ff9c073STheodore Ts'o } 9457ff9c073STheodore Ts'o 946fa0d7e3dSNick Piggin static void ext4_i_callback(struct rcu_head *head) 947fa0d7e3dSNick Piggin { 948fa0d7e3dSNick Piggin struct inode *inode = container_of(head, struct inode, i_rcu); 949fa0d7e3dSNick Piggin kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); 950fa0d7e3dSNick Piggin } 951fa0d7e3dSNick Piggin 952617ba13bSMingming Cao static void ext4_destroy_inode(struct inode *inode) 953ac27a0ecSDave Kleikamp { 9549f7dd93dSVasily Averin if (!list_empty(&(EXT4_I(inode)->i_orphan))) { 955b31e1552SEric Sandeen ext4_msg(inode->i_sb, KERN_ERR, 956b31e1552SEric Sandeen "Inode %lu (%p): orphan list check failed!", 957b31e1552SEric Sandeen inode->i_ino, EXT4_I(inode)); 9589f7dd93dSVasily Averin print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, 9599f7dd93dSVasily Averin EXT4_I(inode), sizeof(struct ext4_inode_info), 9609f7dd93dSVasily Averin true); 9619f7dd93dSVasily Averin dump_stack(); 9629f7dd93dSVasily Averin } 963fa0d7e3dSNick Piggin call_rcu(&inode->i_rcu, ext4_i_callback); 964ac27a0ecSDave Kleikamp } 965ac27a0ecSDave Kleikamp 96651cc5068SAlexey Dobriyan static void init_once(void *foo) 967ac27a0ecSDave Kleikamp { 968617ba13bSMingming Cao struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; 969ac27a0ecSDave Kleikamp 970ac27a0ecSDave Kleikamp INIT_LIST_HEAD(&ei->i_orphan); 97103010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_XATTR 972ac27a0ecSDave Kleikamp init_rwsem(&ei->xattr_sem); 973ac27a0ecSDave Kleikamp #endif 9740e855ac8SAneesh Kumar K.V init_rwsem(&ei->i_data_sem); 975ac27a0ecSDave Kleikamp inode_init_once(&ei->vfs_inode); 976ac27a0ecSDave Kleikamp } 977ac27a0ecSDave Kleikamp 978ac27a0ecSDave Kleikamp static int init_inodecache(void) 979ac27a0ecSDave Kleikamp { 980617ba13bSMingming Cao ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", 981617ba13bSMingming Cao sizeof(struct ext4_inode_info), 982ac27a0ecSDave Kleikamp 0, (SLAB_RECLAIM_ACCOUNT| 983ac27a0ecSDave Kleikamp SLAB_MEM_SPREAD), 98420c2df83SPaul Mundt init_once); 985617ba13bSMingming Cao if (ext4_inode_cachep == NULL) 986ac27a0ecSDave Kleikamp return -ENOMEM; 987ac27a0ecSDave Kleikamp return 0; 988ac27a0ecSDave Kleikamp } 989ac27a0ecSDave Kleikamp 990ac27a0ecSDave Kleikamp static void destroy_inodecache(void) 991ac27a0ecSDave Kleikamp { 992617ba13bSMingming Cao kmem_cache_destroy(ext4_inode_cachep); 993ac27a0ecSDave Kleikamp } 994ac27a0ecSDave Kleikamp 9950930fcc1SAl Viro void ext4_clear_inode(struct inode *inode) 996ac27a0ecSDave Kleikamp { 9970930fcc1SAl Viro invalidate_inode_buffers(inode); 9980930fcc1SAl Viro end_writeback(inode); 9999f754758SChristoph Hellwig dquot_drop(inode); 1000c2ea3fdeSTheodore Ts'o ext4_discard_preallocations(inode); 10018aefcd55STheodore Ts'o if (EXT4_I(inode)->jinode) { 10028aefcd55STheodore Ts'o jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode), 10038aefcd55STheodore Ts'o EXT4_I(inode)->jinode); 10048aefcd55STheodore Ts'o jbd2_free_inode(EXT4_I(inode)->jinode); 10058aefcd55STheodore Ts'o EXT4_I(inode)->jinode = NULL; 10068aefcd55STheodore Ts'o } 1007ac27a0ecSDave Kleikamp } 1008ac27a0ecSDave Kleikamp 10092b2d6d01STheodore Ts'o static inline void ext4_show_quota_options(struct seq_file *seq, 10102b2d6d01STheodore Ts'o struct super_block *sb) 1011ac27a0ecSDave Kleikamp { 1012ac27a0ecSDave Kleikamp #if defined(CONFIG_QUOTA) 1013617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 1014ac27a0ecSDave Kleikamp 10155a20bdfcSJan Kara if (sbi->s_jquota_fmt) { 10165a20bdfcSJan Kara char *fmtname = ""; 10175a20bdfcSJan Kara 10185a20bdfcSJan Kara switch (sbi->s_jquota_fmt) { 10195a20bdfcSJan Kara case QFMT_VFS_OLD: 10205a20bdfcSJan Kara fmtname = "vfsold"; 10215a20bdfcSJan Kara break; 10225a20bdfcSJan Kara case QFMT_VFS_V0: 10235a20bdfcSJan Kara fmtname = "vfsv0"; 10245a20bdfcSJan Kara break; 10255a20bdfcSJan Kara case QFMT_VFS_V1: 10265a20bdfcSJan Kara fmtname = "vfsv1"; 10275a20bdfcSJan Kara break; 10285a20bdfcSJan Kara } 10295a20bdfcSJan Kara seq_printf(seq, ",jqfmt=%s", fmtname); 10305a20bdfcSJan Kara } 1031ac27a0ecSDave Kleikamp 1032ac27a0ecSDave Kleikamp if (sbi->s_qf_names[USRQUOTA]) 1033ac27a0ecSDave Kleikamp seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); 1034ac27a0ecSDave Kleikamp 1035ac27a0ecSDave Kleikamp if (sbi->s_qf_names[GRPQUOTA]) 1036ac27a0ecSDave Kleikamp seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); 1037ac27a0ecSDave Kleikamp 1038482a7425SDmitry Monakhov if (test_opt(sb, USRQUOTA)) 1039ac27a0ecSDave Kleikamp seq_puts(seq, ",usrquota"); 1040ac27a0ecSDave Kleikamp 1041482a7425SDmitry Monakhov if (test_opt(sb, GRPQUOTA)) 1042ac27a0ecSDave Kleikamp seq_puts(seq, ",grpquota"); 1043ac27a0ecSDave Kleikamp #endif 1044ac27a0ecSDave Kleikamp } 1045ac27a0ecSDave Kleikamp 1046d9c9bef1SMiklos Szeredi /* 1047d9c9bef1SMiklos Szeredi * Show an option if 1048d9c9bef1SMiklos Szeredi * - it's set to a non-default value OR 1049d9c9bef1SMiklos Szeredi * - if the per-sb default is different from the global default 1050d9c9bef1SMiklos Szeredi */ 105134c80b1dSAl Viro static int ext4_show_options(struct seq_file *seq, struct dentry *root) 1052ac27a0ecSDave Kleikamp { 1053aa22df2cSAneesh Kumar K.V int def_errors; 1054aa22df2cSAneesh Kumar K.V unsigned long def_mount_opts; 105534c80b1dSAl Viro struct super_block *sb = root->d_sb; 1056d9c9bef1SMiklos Szeredi struct ext4_sb_info *sbi = EXT4_SB(sb); 1057d9c9bef1SMiklos Szeredi struct ext4_super_block *es = sbi->s_es; 1058d9c9bef1SMiklos Szeredi 1059d9c9bef1SMiklos Szeredi def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 1060aa22df2cSAneesh Kumar K.V def_errors = le16_to_cpu(es->s_errors); 1061d9c9bef1SMiklos Szeredi 1062d9c9bef1SMiklos Szeredi if (sbi->s_sb_block != 1) 1063d9c9bef1SMiklos Szeredi seq_printf(seq, ",sb=%llu", sbi->s_sb_block); 1064d9c9bef1SMiklos Szeredi if (test_opt(sb, MINIX_DF)) 1065d9c9bef1SMiklos Szeredi seq_puts(seq, ",minixdf"); 1066aa22df2cSAneesh Kumar K.V if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS)) 1067d9c9bef1SMiklos Szeredi seq_puts(seq, ",grpid"); 1068d9c9bef1SMiklos Szeredi if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS)) 1069d9c9bef1SMiklos Szeredi seq_puts(seq, ",nogrpid"); 1070d9c9bef1SMiklos Szeredi if (sbi->s_resuid != EXT4_DEF_RESUID || 1071d9c9bef1SMiklos Szeredi le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) { 1072d9c9bef1SMiklos Szeredi seq_printf(seq, ",resuid=%u", sbi->s_resuid); 1073d9c9bef1SMiklos Szeredi } 1074d9c9bef1SMiklos Szeredi if (sbi->s_resgid != EXT4_DEF_RESGID || 1075d9c9bef1SMiklos Szeredi le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) { 1076d9c9bef1SMiklos Szeredi seq_printf(seq, ",resgid=%u", sbi->s_resgid); 1077d9c9bef1SMiklos Szeredi } 1078bb4f397aSAneesh Kumar K.V if (test_opt(sb, ERRORS_RO)) { 1079d9c9bef1SMiklos Szeredi if (def_errors == EXT4_ERRORS_PANIC || 1080bb4f397aSAneesh Kumar K.V def_errors == EXT4_ERRORS_CONTINUE) { 1081d9c9bef1SMiklos Szeredi seq_puts(seq, ",errors=remount-ro"); 1082bb4f397aSAneesh Kumar K.V } 1083bb4f397aSAneesh Kumar K.V } 1084aa22df2cSAneesh Kumar K.V if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) 1085bb4f397aSAneesh Kumar K.V seq_puts(seq, ",errors=continue"); 1086aa22df2cSAneesh Kumar K.V if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) 1087d9c9bef1SMiklos Szeredi seq_puts(seq, ",errors=panic"); 1088aa22df2cSAneesh Kumar K.V if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16)) 1089d9c9bef1SMiklos Szeredi seq_puts(seq, ",nouid32"); 1090aa22df2cSAneesh Kumar K.V if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG)) 1091d9c9bef1SMiklos Szeredi seq_puts(seq, ",debug"); 109203010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_XATTR 1093ea663336SEric Sandeen if (test_opt(sb, XATTR_USER)) 1094d9c9bef1SMiklos Szeredi seq_puts(seq, ",user_xattr"); 1095ea663336SEric Sandeen if (!test_opt(sb, XATTR_USER)) 1096d9c9bef1SMiklos Szeredi seq_puts(seq, ",nouser_xattr"); 1097d9c9bef1SMiklos Szeredi #endif 109803010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 1099aa22df2cSAneesh Kumar K.V if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL)) 1100d9c9bef1SMiklos Szeredi seq_puts(seq, ",acl"); 1101d9c9bef1SMiklos Szeredi if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL)) 1102d9c9bef1SMiklos Szeredi seq_puts(seq, ",noacl"); 1103d9c9bef1SMiklos Szeredi #endif 110430773840STheodore Ts'o if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) { 1105d9c9bef1SMiklos Szeredi seq_printf(seq, ",commit=%u", 1106d9c9bef1SMiklos Szeredi (unsigned) (sbi->s_commit_interval / HZ)); 1107d9c9bef1SMiklos Szeredi } 110830773840STheodore Ts'o if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) { 110930773840STheodore Ts'o seq_printf(seq, ",min_batch_time=%u", 111030773840STheodore Ts'o (unsigned) sbi->s_min_batch_time); 111130773840STheodore Ts'o } 111230773840STheodore Ts'o if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) { 111330773840STheodore Ts'o seq_printf(seq, ",max_batch_time=%u", 11141d526fc9SBen Hutchings (unsigned) sbi->s_max_batch_time); 111530773840STheodore Ts'o } 111630773840STheodore Ts'o 1117571640caSEric Sandeen /* 1118571640caSEric Sandeen * We're changing the default of barrier mount option, so 1119571640caSEric Sandeen * let's always display its mount state so it's clear what its 1120571640caSEric Sandeen * status is. 1121571640caSEric Sandeen */ 1122571640caSEric Sandeen seq_puts(seq, ",barrier="); 1123571640caSEric Sandeen seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0"); 1124cd0b6a39STheodore Ts'o if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) 1125cd0b6a39STheodore Ts'o seq_puts(seq, ",journal_async_commit"); 112639a4badeSJan Kara else if (test_opt(sb, JOURNAL_CHECKSUM)) 112739a4badeSJan Kara seq_puts(seq, ",journal_checksum"); 1128c64db50eSTheodore Ts'o if (sb->s_flags & MS_I_VERSION) 112925ec56b5SJean Noel Cordenner seq_puts(seq, ",i_version"); 11308b67f04aSTheodore Ts'o if (!test_opt(sb, DELALLOC) && 11318b67f04aSTheodore Ts'o !(def_mount_opts & EXT4_DEFM_NODELALLOC)) 1132dd919b98SAneesh Kumar K.V seq_puts(seq, ",nodelalloc"); 1133dd919b98SAneesh Kumar K.V 11346fd7a467STheodore Ts'o if (!test_opt(sb, MBLK_IO_SUBMIT)) 11356fd7a467STheodore Ts'o seq_puts(seq, ",nomblk_io_submit"); 1136cb45bbe4SMiklos Szeredi if (sbi->s_stripe) 1137cb45bbe4SMiklos Szeredi seq_printf(seq, ",stripe=%lu", sbi->s_stripe); 1138aa22df2cSAneesh Kumar K.V /* 1139aa22df2cSAneesh Kumar K.V * journal mode get enabled in different ways 1140aa22df2cSAneesh Kumar K.V * So just print the value even if we didn't specify it 1141aa22df2cSAneesh Kumar K.V */ 1142617ba13bSMingming Cao if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 1143ac27a0ecSDave Kleikamp seq_puts(seq, ",data=journal"); 1144617ba13bSMingming Cao else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 1145ac27a0ecSDave Kleikamp seq_puts(seq, ",data=ordered"); 1146617ba13bSMingming Cao else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) 1147ac27a0ecSDave Kleikamp seq_puts(seq, ",data=writeback"); 1148ac27a0ecSDave Kleikamp 1149240799cdSTheodore Ts'o if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS) 1150240799cdSTheodore Ts'o seq_printf(seq, ",inode_readahead_blks=%u", 1151240799cdSTheodore Ts'o sbi->s_inode_readahead_blks); 1152240799cdSTheodore Ts'o 11535bf5683aSHidehiro Kawai if (test_opt(sb, DATA_ERR_ABORT)) 11545bf5683aSHidehiro Kawai seq_puts(seq, ",data_err=abort"); 11555bf5683aSHidehiro Kawai 1156afd4672dSTheodore Ts'o if (test_opt(sb, NO_AUTO_DA_ALLOC)) 115706705bffSTheodore Ts'o seq_puts(seq, ",noauto_da_alloc"); 1158afd4672dSTheodore Ts'o 11598b67f04aSTheodore Ts'o if (test_opt(sb, DISCARD) && !(def_mount_opts & EXT4_DEFM_DISCARD)) 11605328e635SEric Sandeen seq_puts(seq, ",discard"); 11615328e635SEric Sandeen 1162e3bb52aeSEric Sandeen if (test_opt(sb, NOLOAD)) 1163e3bb52aeSEric Sandeen seq_puts(seq, ",norecovery"); 1164e3bb52aeSEric Sandeen 1165744692dcSJiaying Zhang if (test_opt(sb, DIOREAD_NOLOCK)) 1166744692dcSJiaying Zhang seq_puts(seq, ",dioread_nolock"); 1167744692dcSJiaying Zhang 11688b67f04aSTheodore Ts'o if (test_opt(sb, BLOCK_VALIDITY) && 11698b67f04aSTheodore Ts'o !(def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)) 11708b67f04aSTheodore Ts'o seq_puts(seq, ",block_validity"); 11718b67f04aSTheodore Ts'o 1172bfff6873SLukas Czerner if (!test_opt(sb, INIT_INODE_TABLE)) 1173fc6cb1cdSTheodore Ts'o seq_puts(seq, ",noinit_itable"); 117451ce6511SLukas Czerner else if (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT) 1175fc6cb1cdSTheodore Ts'o seq_printf(seq, ",init_itable=%u", 1176bfff6873SLukas Czerner (unsigned) sbi->s_li_wait_mult); 1177bfff6873SLukas Czerner 1178617ba13bSMingming Cao ext4_show_quota_options(seq, sb); 11790b8e58a1SAndreas Dilger 1180ac27a0ecSDave Kleikamp return 0; 1181ac27a0ecSDave Kleikamp } 1182ac27a0ecSDave Kleikamp 11831b961ac0SChristoph Hellwig static struct inode *ext4_nfs_get_inode(struct super_block *sb, 11841b961ac0SChristoph Hellwig u64 ino, u32 generation) 1185ac27a0ecSDave Kleikamp { 1186ac27a0ecSDave Kleikamp struct inode *inode; 1187ac27a0ecSDave Kleikamp 1188617ba13bSMingming Cao if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) 1189ac27a0ecSDave Kleikamp return ERR_PTR(-ESTALE); 1190617ba13bSMingming Cao if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) 1191ac27a0ecSDave Kleikamp return ERR_PTR(-ESTALE); 1192ac27a0ecSDave Kleikamp 1193ac27a0ecSDave Kleikamp /* iget isn't really right if the inode is currently unallocated!! 1194ac27a0ecSDave Kleikamp * 1195617ba13bSMingming Cao * ext4_read_inode will return a bad_inode if the inode had been 1196ac27a0ecSDave Kleikamp * deleted, so we should be safe. 1197ac27a0ecSDave Kleikamp * 1198ac27a0ecSDave Kleikamp * Currently we don't know the generation for parent directory, so 1199ac27a0ecSDave Kleikamp * a generation of 0 means "accept any" 1200ac27a0ecSDave Kleikamp */ 12011d1fe1eeSDavid Howells inode = ext4_iget(sb, ino); 12021d1fe1eeSDavid Howells if (IS_ERR(inode)) 12031d1fe1eeSDavid Howells return ERR_CAST(inode); 12041d1fe1eeSDavid Howells if (generation && inode->i_generation != generation) { 1205ac27a0ecSDave Kleikamp iput(inode); 1206ac27a0ecSDave Kleikamp return ERR_PTR(-ESTALE); 1207ac27a0ecSDave Kleikamp } 12081b961ac0SChristoph Hellwig 12091b961ac0SChristoph Hellwig return inode; 1210ac27a0ecSDave Kleikamp } 12111b961ac0SChristoph Hellwig 12121b961ac0SChristoph Hellwig static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, 12131b961ac0SChristoph Hellwig int fh_len, int fh_type) 12141b961ac0SChristoph Hellwig { 12151b961ac0SChristoph Hellwig return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 12161b961ac0SChristoph Hellwig ext4_nfs_get_inode); 12171b961ac0SChristoph Hellwig } 12181b961ac0SChristoph Hellwig 12191b961ac0SChristoph Hellwig static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, 12201b961ac0SChristoph Hellwig int fh_len, int fh_type) 12211b961ac0SChristoph Hellwig { 12221b961ac0SChristoph Hellwig return generic_fh_to_parent(sb, fid, fh_len, fh_type, 12231b961ac0SChristoph Hellwig ext4_nfs_get_inode); 1224ac27a0ecSDave Kleikamp } 1225ac27a0ecSDave Kleikamp 1226c39a7f84SToshiyuki Okajima /* 1227c39a7f84SToshiyuki Okajima * Try to release metadata pages (indirect blocks, directories) which are 1228c39a7f84SToshiyuki Okajima * mapped via the block device. Since these pages could have journal heads 1229c39a7f84SToshiyuki Okajima * which would prevent try_to_free_buffers() from freeing them, we must use 1230c39a7f84SToshiyuki Okajima * jbd2 layer's try_to_free_buffers() function to release them. 1231c39a7f84SToshiyuki Okajima */ 12320b8e58a1SAndreas Dilger static int bdev_try_to_free_page(struct super_block *sb, struct page *page, 12330b8e58a1SAndreas Dilger gfp_t wait) 1234c39a7f84SToshiyuki Okajima { 1235c39a7f84SToshiyuki Okajima journal_t *journal = EXT4_SB(sb)->s_journal; 1236c39a7f84SToshiyuki Okajima 1237c39a7f84SToshiyuki Okajima WARN_ON(PageChecked(page)); 1238c39a7f84SToshiyuki Okajima if (!page_has_buffers(page)) 1239c39a7f84SToshiyuki Okajima return 0; 1240c39a7f84SToshiyuki Okajima if (journal) 1241c39a7f84SToshiyuki Okajima return jbd2_journal_try_to_free_buffers(journal, page, 1242c39a7f84SToshiyuki Okajima wait & ~__GFP_WAIT); 1243c39a7f84SToshiyuki Okajima return try_to_free_buffers(page); 1244c39a7f84SToshiyuki Okajima } 1245c39a7f84SToshiyuki Okajima 1246ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1247ac27a0ecSDave Kleikamp #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group") 1248ac27a0ecSDave Kleikamp #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) 1249ac27a0ecSDave Kleikamp 1250617ba13bSMingming Cao static int ext4_write_dquot(struct dquot *dquot); 1251617ba13bSMingming Cao static int ext4_acquire_dquot(struct dquot *dquot); 1252617ba13bSMingming Cao static int ext4_release_dquot(struct dquot *dquot); 1253617ba13bSMingming Cao static int ext4_mark_dquot_dirty(struct dquot *dquot); 1254617ba13bSMingming Cao static int ext4_write_info(struct super_block *sb, int type); 12556f28e087SJan Kara static int ext4_quota_on(struct super_block *sb, int type, int format_id, 1256f00c9e44SJan Kara struct path *path); 1257ca0e05e4SDmitry Monakhov static int ext4_quota_off(struct super_block *sb, int type); 1258617ba13bSMingming Cao static int ext4_quota_on_mount(struct super_block *sb, int type); 1259617ba13bSMingming Cao static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 1260ac27a0ecSDave Kleikamp size_t len, loff_t off); 1261617ba13bSMingming Cao static ssize_t ext4_quota_write(struct super_block *sb, int type, 1262ac27a0ecSDave Kleikamp const char *data, size_t len, loff_t off); 1263ac27a0ecSDave Kleikamp 126461e225dcSAlexey Dobriyan static const struct dquot_operations ext4_quota_operations = { 126560e58e0fSMingming Cao .get_reserved_space = ext4_get_reserved_space, 1266617ba13bSMingming Cao .write_dquot = ext4_write_dquot, 1267617ba13bSMingming Cao .acquire_dquot = ext4_acquire_dquot, 1268617ba13bSMingming Cao .release_dquot = ext4_release_dquot, 1269617ba13bSMingming Cao .mark_dirty = ext4_mark_dquot_dirty, 1270a5b5ee32SJan Kara .write_info = ext4_write_info, 1271a5b5ee32SJan Kara .alloc_dquot = dquot_alloc, 1272a5b5ee32SJan Kara .destroy_dquot = dquot_destroy, 1273ac27a0ecSDave Kleikamp }; 1274ac27a0ecSDave Kleikamp 12750d54b217SAlexey Dobriyan static const struct quotactl_ops ext4_qctl_operations = { 1276617ba13bSMingming Cao .quota_on = ext4_quota_on, 1277ca0e05e4SDmitry Monakhov .quota_off = ext4_quota_off, 1278287a8095SChristoph Hellwig .quota_sync = dquot_quota_sync, 1279287a8095SChristoph Hellwig .get_info = dquot_get_dqinfo, 1280287a8095SChristoph Hellwig .set_info = dquot_set_dqinfo, 1281287a8095SChristoph Hellwig .get_dqblk = dquot_get_dqblk, 1282287a8095SChristoph Hellwig .set_dqblk = dquot_set_dqblk 1283ac27a0ecSDave Kleikamp }; 1284ac27a0ecSDave Kleikamp #endif 1285ac27a0ecSDave Kleikamp 1286ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations ext4_sops = { 1287617ba13bSMingming Cao .alloc_inode = ext4_alloc_inode, 1288617ba13bSMingming Cao .destroy_inode = ext4_destroy_inode, 1289617ba13bSMingming Cao .write_inode = ext4_write_inode, 1290617ba13bSMingming Cao .dirty_inode = ext4_dirty_inode, 12917ff9c073STheodore Ts'o .drop_inode = ext4_drop_inode, 12920930fcc1SAl Viro .evict_inode = ext4_evict_inode, 1293617ba13bSMingming Cao .put_super = ext4_put_super, 1294617ba13bSMingming Cao .sync_fs = ext4_sync_fs, 1295c4be0c1dSTakashi Sato .freeze_fs = ext4_freeze, 1296c4be0c1dSTakashi Sato .unfreeze_fs = ext4_unfreeze, 1297617ba13bSMingming Cao .statfs = ext4_statfs, 1298617ba13bSMingming Cao .remount_fs = ext4_remount, 1299617ba13bSMingming Cao .show_options = ext4_show_options, 1300ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1301617ba13bSMingming Cao .quota_read = ext4_quota_read, 1302617ba13bSMingming Cao .quota_write = ext4_quota_write, 1303ac27a0ecSDave Kleikamp #endif 1304c39a7f84SToshiyuki Okajima .bdev_try_to_free_page = bdev_try_to_free_page, 1305ac27a0ecSDave Kleikamp }; 1306ac27a0ecSDave Kleikamp 13079ca92389STheodore Ts'o static const struct super_operations ext4_nojournal_sops = { 13089ca92389STheodore Ts'o .alloc_inode = ext4_alloc_inode, 13099ca92389STheodore Ts'o .destroy_inode = ext4_destroy_inode, 13109ca92389STheodore Ts'o .write_inode = ext4_write_inode, 13119ca92389STheodore Ts'o .dirty_inode = ext4_dirty_inode, 13127ff9c073STheodore Ts'o .drop_inode = ext4_drop_inode, 13130930fcc1SAl Viro .evict_inode = ext4_evict_inode, 13149ca92389STheodore Ts'o .write_super = ext4_write_super, 13159ca92389STheodore Ts'o .put_super = ext4_put_super, 13169ca92389STheodore Ts'o .statfs = ext4_statfs, 13179ca92389STheodore Ts'o .remount_fs = ext4_remount, 13189ca92389STheodore Ts'o .show_options = ext4_show_options, 13199ca92389STheodore Ts'o #ifdef CONFIG_QUOTA 13209ca92389STheodore Ts'o .quota_read = ext4_quota_read, 13219ca92389STheodore Ts'o .quota_write = ext4_quota_write, 13229ca92389STheodore Ts'o #endif 13239ca92389STheodore Ts'o .bdev_try_to_free_page = bdev_try_to_free_page, 13249ca92389STheodore Ts'o }; 13259ca92389STheodore Ts'o 132639655164SChristoph Hellwig static const struct export_operations ext4_export_ops = { 13271b961ac0SChristoph Hellwig .fh_to_dentry = ext4_fh_to_dentry, 13281b961ac0SChristoph Hellwig .fh_to_parent = ext4_fh_to_parent, 1329617ba13bSMingming Cao .get_parent = ext4_get_parent, 1330ac27a0ecSDave Kleikamp }; 1331ac27a0ecSDave Kleikamp 1332ac27a0ecSDave Kleikamp enum { 1333ac27a0ecSDave Kleikamp Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 1334ac27a0ecSDave Kleikamp Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, 1335*72578c33STheodore Ts'o Opt_nouid32, Opt_debug, Opt_removed, 1336ac27a0ecSDave Kleikamp Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, 1337*72578c33STheodore Ts'o Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, 133830773840STheodore Ts'o Opt_commit, Opt_min_batch_time, Opt_max_batch_time, 133943e625d8SEric Sandeen Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit, 1340ac27a0ecSDave Kleikamp Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, 1341296c355cSTheodore Ts'o Opt_data_err_abort, Opt_data_err_ignore, 1342ac27a0ecSDave Kleikamp Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, 13435a20bdfcSJan Kara Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota, 1344ee4a3fcdSTheodore Ts'o Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err, 1345661aa520SEric Sandeen Opt_usrquota, Opt_grpquota, Opt_i_version, 13461449032bSTheodore Ts'o Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit, 13471449032bSTheodore Ts'o Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity, 13485328e635SEric Sandeen Opt_inode_readahead_blks, Opt_journal_ioprio, 1349744692dcSJiaying Zhang Opt_dioread_nolock, Opt_dioread_lock, 1350fc6cb1cdSTheodore Ts'o Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable, 1351ac27a0ecSDave Kleikamp }; 1352ac27a0ecSDave Kleikamp 1353a447c093SSteven Whitehouse static const match_table_t tokens = { 1354ac27a0ecSDave Kleikamp {Opt_bsd_df, "bsddf"}, 1355ac27a0ecSDave Kleikamp {Opt_minix_df, "minixdf"}, 1356ac27a0ecSDave Kleikamp {Opt_grpid, "grpid"}, 1357ac27a0ecSDave Kleikamp {Opt_grpid, "bsdgroups"}, 1358ac27a0ecSDave Kleikamp {Opt_nogrpid, "nogrpid"}, 1359ac27a0ecSDave Kleikamp {Opt_nogrpid, "sysvgroups"}, 1360ac27a0ecSDave Kleikamp {Opt_resgid, "resgid=%u"}, 1361ac27a0ecSDave Kleikamp {Opt_resuid, "resuid=%u"}, 1362ac27a0ecSDave Kleikamp {Opt_sb, "sb=%u"}, 1363ac27a0ecSDave Kleikamp {Opt_err_cont, "errors=continue"}, 1364ac27a0ecSDave Kleikamp {Opt_err_panic, "errors=panic"}, 1365ac27a0ecSDave Kleikamp {Opt_err_ro, "errors=remount-ro"}, 1366ac27a0ecSDave Kleikamp {Opt_nouid32, "nouid32"}, 1367ac27a0ecSDave Kleikamp {Opt_debug, "debug"}, 1368*72578c33STheodore Ts'o {Opt_removed, "oldalloc"}, 1369*72578c33STheodore Ts'o {Opt_removed, "orlov"}, 1370ac27a0ecSDave Kleikamp {Opt_user_xattr, "user_xattr"}, 1371ac27a0ecSDave Kleikamp {Opt_nouser_xattr, "nouser_xattr"}, 1372ac27a0ecSDave Kleikamp {Opt_acl, "acl"}, 1373ac27a0ecSDave Kleikamp {Opt_noacl, "noacl"}, 1374ac27a0ecSDave Kleikamp {Opt_noload, "noload"}, 1375e3bb52aeSEric Sandeen {Opt_noload, "norecovery"}, 1376*72578c33STheodore Ts'o {Opt_removed, "nobh"}, 1377*72578c33STheodore Ts'o {Opt_removed, "bh"}, 1378ac27a0ecSDave Kleikamp {Opt_commit, "commit=%u"}, 137930773840STheodore Ts'o {Opt_min_batch_time, "min_batch_time=%u"}, 138030773840STheodore Ts'o {Opt_max_batch_time, "max_batch_time=%u"}, 1381ac27a0ecSDave Kleikamp {Opt_journal_dev, "journal_dev=%u"}, 1382818d276cSGirish Shilamkar {Opt_journal_checksum, "journal_checksum"}, 1383818d276cSGirish Shilamkar {Opt_journal_async_commit, "journal_async_commit"}, 1384ac27a0ecSDave Kleikamp {Opt_abort, "abort"}, 1385ac27a0ecSDave Kleikamp {Opt_data_journal, "data=journal"}, 1386ac27a0ecSDave Kleikamp {Opt_data_ordered, "data=ordered"}, 1387ac27a0ecSDave Kleikamp {Opt_data_writeback, "data=writeback"}, 13885bf5683aSHidehiro Kawai {Opt_data_err_abort, "data_err=abort"}, 13895bf5683aSHidehiro Kawai {Opt_data_err_ignore, "data_err=ignore"}, 1390ac27a0ecSDave Kleikamp {Opt_offusrjquota, "usrjquota="}, 1391ac27a0ecSDave Kleikamp {Opt_usrjquota, "usrjquota=%s"}, 1392ac27a0ecSDave Kleikamp {Opt_offgrpjquota, "grpjquota="}, 1393ac27a0ecSDave Kleikamp {Opt_grpjquota, "grpjquota=%s"}, 1394ac27a0ecSDave Kleikamp {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, 1395ac27a0ecSDave Kleikamp {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, 13965a20bdfcSJan Kara {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"}, 1397ac27a0ecSDave Kleikamp {Opt_grpquota, "grpquota"}, 1398ac27a0ecSDave Kleikamp {Opt_noquota, "noquota"}, 1399ac27a0ecSDave Kleikamp {Opt_quota, "quota"}, 1400ac27a0ecSDave Kleikamp {Opt_usrquota, "usrquota"}, 1401ac27a0ecSDave Kleikamp {Opt_barrier, "barrier=%u"}, 140206705bffSTheodore Ts'o {Opt_barrier, "barrier"}, 140306705bffSTheodore Ts'o {Opt_nobarrier, "nobarrier"}, 140425ec56b5SJean Noel Cordenner {Opt_i_version, "i_version"}, 1405c9de560dSAlex Tomas {Opt_stripe, "stripe=%u"}, 140664769240SAlex Tomas {Opt_delalloc, "delalloc"}, 1407dd919b98SAneesh Kumar K.V {Opt_nodelalloc, "nodelalloc"}, 14081449032bSTheodore Ts'o {Opt_mblk_io_submit, "mblk_io_submit"}, 14091449032bSTheodore Ts'o {Opt_nomblk_io_submit, "nomblk_io_submit"}, 14106fd058f7STheodore Ts'o {Opt_block_validity, "block_validity"}, 14116fd058f7STheodore Ts'o {Opt_noblock_validity, "noblock_validity"}, 1412240799cdSTheodore Ts'o {Opt_inode_readahead_blks, "inode_readahead_blks=%u"}, 1413b3881f74STheodore Ts'o {Opt_journal_ioprio, "journal_ioprio=%u"}, 1414afd4672dSTheodore Ts'o {Opt_auto_da_alloc, "auto_da_alloc=%u"}, 141506705bffSTheodore Ts'o {Opt_auto_da_alloc, "auto_da_alloc"}, 141606705bffSTheodore Ts'o {Opt_noauto_da_alloc, "noauto_da_alloc"}, 1417744692dcSJiaying Zhang {Opt_dioread_nolock, "dioread_nolock"}, 1418744692dcSJiaying Zhang {Opt_dioread_lock, "dioread_lock"}, 14195328e635SEric Sandeen {Opt_discard, "discard"}, 14205328e635SEric Sandeen {Opt_nodiscard, "nodiscard"}, 1421fc6cb1cdSTheodore Ts'o {Opt_init_itable, "init_itable=%u"}, 1422fc6cb1cdSTheodore Ts'o {Opt_init_itable, "init_itable"}, 1423fc6cb1cdSTheodore Ts'o {Opt_noinit_itable, "noinit_itable"}, 1424f3f12faaSJosef Bacik {Opt_err, NULL}, 1425ac27a0ecSDave Kleikamp }; 1426ac27a0ecSDave Kleikamp 1427617ba13bSMingming Cao static ext4_fsblk_t get_sb_block(void **data) 1428ac27a0ecSDave Kleikamp { 1429617ba13bSMingming Cao ext4_fsblk_t sb_block; 1430ac27a0ecSDave Kleikamp char *options = (char *) *data; 1431ac27a0ecSDave Kleikamp 1432ac27a0ecSDave Kleikamp if (!options || strncmp(options, "sb=", 3) != 0) 1433ac27a0ecSDave Kleikamp return 1; /* Default location */ 14340b8e58a1SAndreas Dilger 1435ac27a0ecSDave Kleikamp options += 3; 14360b8e58a1SAndreas Dilger /* TODO: use simple_strtoll with >32bit ext4 */ 1437ac27a0ecSDave Kleikamp sb_block = simple_strtoul(options, &options, 0); 1438ac27a0ecSDave Kleikamp if (*options && *options != ',') { 14394776004fSTheodore Ts'o printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n", 1440ac27a0ecSDave Kleikamp (char *) *data); 1441ac27a0ecSDave Kleikamp return 1; 1442ac27a0ecSDave Kleikamp } 1443ac27a0ecSDave Kleikamp if (*options == ',') 1444ac27a0ecSDave Kleikamp options++; 1445ac27a0ecSDave Kleikamp *data = (void *) options; 14460b8e58a1SAndreas Dilger 1447ac27a0ecSDave Kleikamp return sb_block; 1448ac27a0ecSDave Kleikamp } 1449ac27a0ecSDave Kleikamp 1450b3881f74STheodore Ts'o #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3)) 1451437ca0fdSDmitry Monakhov static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n" 1452437ca0fdSDmitry Monakhov "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n"; 1453b3881f74STheodore Ts'o 145456c50f11SDmitry Monakhov #ifdef CONFIG_QUOTA 145556c50f11SDmitry Monakhov static int set_qf_name(struct super_block *sb, int qtype, substring_t *args) 145656c50f11SDmitry Monakhov { 145756c50f11SDmitry Monakhov struct ext4_sb_info *sbi = EXT4_SB(sb); 145856c50f11SDmitry Monakhov char *qname; 145956c50f11SDmitry Monakhov 146056c50f11SDmitry Monakhov if (sb_any_quota_loaded(sb) && 146156c50f11SDmitry Monakhov !sbi->s_qf_names[qtype]) { 146256c50f11SDmitry Monakhov ext4_msg(sb, KERN_ERR, 146356c50f11SDmitry Monakhov "Cannot change journaled " 146456c50f11SDmitry Monakhov "quota options when quota turned on"); 146556c50f11SDmitry Monakhov return 0; 146656c50f11SDmitry Monakhov } 146756c50f11SDmitry Monakhov qname = match_strdup(args); 146856c50f11SDmitry Monakhov if (!qname) { 146956c50f11SDmitry Monakhov ext4_msg(sb, KERN_ERR, 147056c50f11SDmitry Monakhov "Not enough memory for storing quotafile name"); 147156c50f11SDmitry Monakhov return 0; 147256c50f11SDmitry Monakhov } 147356c50f11SDmitry Monakhov if (sbi->s_qf_names[qtype] && 147456c50f11SDmitry Monakhov strcmp(sbi->s_qf_names[qtype], qname)) { 147556c50f11SDmitry Monakhov ext4_msg(sb, KERN_ERR, 147656c50f11SDmitry Monakhov "%s quota file already specified", QTYPE2NAME(qtype)); 147756c50f11SDmitry Monakhov kfree(qname); 147856c50f11SDmitry Monakhov return 0; 147956c50f11SDmitry Monakhov } 148056c50f11SDmitry Monakhov sbi->s_qf_names[qtype] = qname; 148156c50f11SDmitry Monakhov if (strchr(sbi->s_qf_names[qtype], '/')) { 148256c50f11SDmitry Monakhov ext4_msg(sb, KERN_ERR, 148356c50f11SDmitry Monakhov "quotafile must be on filesystem root"); 148456c50f11SDmitry Monakhov kfree(sbi->s_qf_names[qtype]); 148556c50f11SDmitry Monakhov sbi->s_qf_names[qtype] = NULL; 148656c50f11SDmitry Monakhov return 0; 148756c50f11SDmitry Monakhov } 1488fd8c37ecSTheodore Ts'o set_opt(sb, QUOTA); 148956c50f11SDmitry Monakhov return 1; 149056c50f11SDmitry Monakhov } 149156c50f11SDmitry Monakhov 149256c50f11SDmitry Monakhov static int clear_qf_name(struct super_block *sb, int qtype) 149356c50f11SDmitry Monakhov { 149456c50f11SDmitry Monakhov 149556c50f11SDmitry Monakhov struct ext4_sb_info *sbi = EXT4_SB(sb); 149656c50f11SDmitry Monakhov 149756c50f11SDmitry Monakhov if (sb_any_quota_loaded(sb) && 149856c50f11SDmitry Monakhov sbi->s_qf_names[qtype]) { 149956c50f11SDmitry Monakhov ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options" 150056c50f11SDmitry Monakhov " when quota turned on"); 150156c50f11SDmitry Monakhov return 0; 150256c50f11SDmitry Monakhov } 150356c50f11SDmitry Monakhov /* 150456c50f11SDmitry Monakhov * The space will be released later when all options are confirmed 150556c50f11SDmitry Monakhov * to be correct 150656c50f11SDmitry Monakhov */ 150756c50f11SDmitry Monakhov sbi->s_qf_names[qtype] = NULL; 150856c50f11SDmitry Monakhov return 1; 150956c50f11SDmitry Monakhov } 151056c50f11SDmitry Monakhov #endif 151156c50f11SDmitry Monakhov 1512ac27a0ecSDave Kleikamp static int parse_options(char *options, struct super_block *sb, 1513c3191067STheodore Ts'o unsigned long *journal_devnum, 1514b3881f74STheodore Ts'o unsigned int *journal_ioprio, 1515661aa520SEric Sandeen int is_remount) 1516ac27a0ecSDave Kleikamp { 1517617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 1518ac27a0ecSDave Kleikamp char *p; 1519ac27a0ecSDave Kleikamp substring_t args[MAX_OPT_ARGS]; 1520ac27a0ecSDave Kleikamp int data_opt = 0; 1521ac27a0ecSDave Kleikamp int option; 1522ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 152356c50f11SDmitry Monakhov int qfmt; 1524ac27a0ecSDave Kleikamp #endif 1525ac27a0ecSDave Kleikamp 1526ac27a0ecSDave Kleikamp if (!options) 1527ac27a0ecSDave Kleikamp return 1; 1528ac27a0ecSDave Kleikamp 1529ac27a0ecSDave Kleikamp while ((p = strsep(&options, ",")) != NULL) { 1530ac27a0ecSDave Kleikamp int token; 1531ac27a0ecSDave Kleikamp if (!*p) 1532ac27a0ecSDave Kleikamp continue; 1533ac27a0ecSDave Kleikamp 153415121c18SEric Sandeen /* 153515121c18SEric Sandeen * Initialize args struct so we know whether arg was 153615121c18SEric Sandeen * found; some options take optional arguments. 153715121c18SEric Sandeen */ 15387dc57615SPeter Huewe args[0].to = args[0].from = NULL; 1539ac27a0ecSDave Kleikamp token = match_token(p, tokens, args); 1540ac27a0ecSDave Kleikamp switch (token) { 1541ac27a0ecSDave Kleikamp case Opt_bsd_df: 1542fd8c37ecSTheodore Ts'o clear_opt(sb, MINIX_DF); 1543ac27a0ecSDave Kleikamp break; 1544ac27a0ecSDave Kleikamp case Opt_minix_df: 1545fd8c37ecSTheodore Ts'o set_opt(sb, MINIX_DF); 1546ac27a0ecSDave Kleikamp break; 1547ac27a0ecSDave Kleikamp case Opt_grpid: 1548fd8c37ecSTheodore Ts'o set_opt(sb, GRPID); 1549ac27a0ecSDave Kleikamp break; 1550ac27a0ecSDave Kleikamp case Opt_nogrpid: 1551fd8c37ecSTheodore Ts'o clear_opt(sb, GRPID); 1552ac27a0ecSDave Kleikamp break; 1553ac27a0ecSDave Kleikamp case Opt_resuid: 1554ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 1555ac27a0ecSDave Kleikamp return 0; 1556ac27a0ecSDave Kleikamp sbi->s_resuid = option; 1557ac27a0ecSDave Kleikamp break; 1558ac27a0ecSDave Kleikamp case Opt_resgid: 1559ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 1560ac27a0ecSDave Kleikamp return 0; 1561ac27a0ecSDave Kleikamp sbi->s_resgid = option; 1562ac27a0ecSDave Kleikamp break; 1563ac27a0ecSDave Kleikamp case Opt_sb: 1564ac27a0ecSDave Kleikamp /* handled by get_sb_block() instead of here */ 1565ac27a0ecSDave Kleikamp /* *sb_block = match_int(&args[0]); */ 1566ac27a0ecSDave Kleikamp break; 1567ac27a0ecSDave Kleikamp case Opt_err_panic: 156839ef17f1STheodore Ts'o clear_opt(sb, ERRORS_MASK); 1569fd8c37ecSTheodore Ts'o set_opt(sb, ERRORS_PANIC); 1570ac27a0ecSDave Kleikamp break; 1571ac27a0ecSDave Kleikamp case Opt_err_ro: 157239ef17f1STheodore Ts'o clear_opt(sb, ERRORS_MASK); 1573fd8c37ecSTheodore Ts'o set_opt(sb, ERRORS_RO); 1574ac27a0ecSDave Kleikamp break; 1575ac27a0ecSDave Kleikamp case Opt_err_cont: 157639ef17f1STheodore Ts'o clear_opt(sb, ERRORS_MASK); 1577fd8c37ecSTheodore Ts'o set_opt(sb, ERRORS_CONT); 1578ac27a0ecSDave Kleikamp break; 1579ac27a0ecSDave Kleikamp case Opt_nouid32: 1580fd8c37ecSTheodore Ts'o set_opt(sb, NO_UID32); 1581ac27a0ecSDave Kleikamp break; 1582ac27a0ecSDave Kleikamp case Opt_debug: 1583fd8c37ecSTheodore Ts'o set_opt(sb, DEBUG); 1584ac27a0ecSDave Kleikamp break; 1585*72578c33STheodore Ts'o case Opt_removed: 15864113c4caSLukas Czerner ext4_msg(sb, KERN_WARNING, 1587*72578c33STheodore Ts'o "Ignoring deprecated %s option", p); 1588ac27a0ecSDave Kleikamp break; 158903010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_XATTR 1590ac27a0ecSDave Kleikamp case Opt_user_xattr: 1591fd8c37ecSTheodore Ts'o set_opt(sb, XATTR_USER); 1592ac27a0ecSDave Kleikamp break; 1593ac27a0ecSDave Kleikamp case Opt_nouser_xattr: 1594fd8c37ecSTheodore Ts'o clear_opt(sb, XATTR_USER); 1595ac27a0ecSDave Kleikamp break; 1596ac27a0ecSDave Kleikamp #else 1597ac27a0ecSDave Kleikamp case Opt_user_xattr: 1598ac27a0ecSDave Kleikamp case Opt_nouser_xattr: 1599b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported"); 1600ac27a0ecSDave Kleikamp break; 1601ac27a0ecSDave Kleikamp #endif 160203010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 1603ac27a0ecSDave Kleikamp case Opt_acl: 1604fd8c37ecSTheodore Ts'o set_opt(sb, POSIX_ACL); 1605ac27a0ecSDave Kleikamp break; 1606ac27a0ecSDave Kleikamp case Opt_noacl: 1607fd8c37ecSTheodore Ts'o clear_opt(sb, POSIX_ACL); 1608ac27a0ecSDave Kleikamp break; 1609ac27a0ecSDave Kleikamp #else 1610ac27a0ecSDave Kleikamp case Opt_acl: 1611ac27a0ecSDave Kleikamp case Opt_noacl: 1612b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "(no)acl options not supported"); 1613ac27a0ecSDave Kleikamp break; 1614ac27a0ecSDave Kleikamp #endif 1615ac27a0ecSDave Kleikamp case Opt_journal_dev: 1616ac27a0ecSDave Kleikamp if (is_remount) { 1617b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, 1618b31e1552SEric Sandeen "Cannot specify journal on remount"); 1619ac27a0ecSDave Kleikamp return 0; 1620ac27a0ecSDave Kleikamp } 1621ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 1622ac27a0ecSDave Kleikamp return 0; 1623ac27a0ecSDave Kleikamp *journal_devnum = option; 1624ac27a0ecSDave Kleikamp break; 1625818d276cSGirish Shilamkar case Opt_journal_checksum: 1626fd8c37ecSTheodore Ts'o set_opt(sb, JOURNAL_CHECKSUM); 1627d4da6c9cSLinus Torvalds break; 1628818d276cSGirish Shilamkar case Opt_journal_async_commit: 1629fd8c37ecSTheodore Ts'o set_opt(sb, JOURNAL_ASYNC_COMMIT); 1630fd8c37ecSTheodore Ts'o set_opt(sb, JOURNAL_CHECKSUM); 1631818d276cSGirish Shilamkar break; 1632ac27a0ecSDave Kleikamp case Opt_noload: 1633fd8c37ecSTheodore Ts'o set_opt(sb, NOLOAD); 1634ac27a0ecSDave Kleikamp break; 1635ac27a0ecSDave Kleikamp case Opt_commit: 1636ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 1637ac27a0ecSDave Kleikamp return 0; 1638ac27a0ecSDave Kleikamp if (option < 0) 1639ac27a0ecSDave Kleikamp return 0; 1640ac27a0ecSDave Kleikamp if (option == 0) 1641cd02ff0bSMingming Cao option = JBD2_DEFAULT_MAX_COMMIT_AGE; 1642ac27a0ecSDave Kleikamp sbi->s_commit_interval = HZ * option; 1643ac27a0ecSDave Kleikamp break; 164430773840STheodore Ts'o case Opt_max_batch_time: 164530773840STheodore Ts'o if (match_int(&args[0], &option)) 164630773840STheodore Ts'o return 0; 164730773840STheodore Ts'o if (option < 0) 164830773840STheodore Ts'o return 0; 164930773840STheodore Ts'o if (option == 0) 165030773840STheodore Ts'o option = EXT4_DEF_MAX_BATCH_TIME; 165130773840STheodore Ts'o sbi->s_max_batch_time = option; 165230773840STheodore Ts'o break; 165330773840STheodore Ts'o case Opt_min_batch_time: 165430773840STheodore Ts'o if (match_int(&args[0], &option)) 165530773840STheodore Ts'o return 0; 165630773840STheodore Ts'o if (option < 0) 165730773840STheodore Ts'o return 0; 165830773840STheodore Ts'o sbi->s_min_batch_time = option; 165930773840STheodore Ts'o break; 1660ac27a0ecSDave Kleikamp case Opt_data_journal: 1661617ba13bSMingming Cao data_opt = EXT4_MOUNT_JOURNAL_DATA; 1662ac27a0ecSDave Kleikamp goto datacheck; 1663ac27a0ecSDave Kleikamp case Opt_data_ordered: 1664617ba13bSMingming Cao data_opt = EXT4_MOUNT_ORDERED_DATA; 1665ac27a0ecSDave Kleikamp goto datacheck; 1666ac27a0ecSDave Kleikamp case Opt_data_writeback: 1667617ba13bSMingming Cao data_opt = EXT4_MOUNT_WRITEBACK_DATA; 1668ac27a0ecSDave Kleikamp datacheck: 1669ac27a0ecSDave Kleikamp if (is_remount) { 1670eb513689STheodore Ts'o if (!sbi->s_journal) 1671eb513689STheodore Ts'o ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option"); 1672eb513689STheodore Ts'o else if (test_opt(sb, DATA_FLAGS) != data_opt) { 1673b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, 1674b31e1552SEric Sandeen "Cannot change data mode on remount"); 1675ac27a0ecSDave Kleikamp return 0; 1676ac27a0ecSDave Kleikamp } 1677ac27a0ecSDave Kleikamp } else { 1678fd8c37ecSTheodore Ts'o clear_opt(sb, DATA_FLAGS); 1679ac27a0ecSDave Kleikamp sbi->s_mount_opt |= data_opt; 1680ac27a0ecSDave Kleikamp } 1681ac27a0ecSDave Kleikamp break; 16825bf5683aSHidehiro Kawai case Opt_data_err_abort: 1683fd8c37ecSTheodore Ts'o set_opt(sb, DATA_ERR_ABORT); 16845bf5683aSHidehiro Kawai break; 16855bf5683aSHidehiro Kawai case Opt_data_err_ignore: 1686fd8c37ecSTheodore Ts'o clear_opt(sb, DATA_ERR_ABORT); 16875bf5683aSHidehiro Kawai break; 1688ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1689ac27a0ecSDave Kleikamp case Opt_usrjquota: 169056c50f11SDmitry Monakhov if (!set_qf_name(sb, USRQUOTA, &args[0])) 169156c50f11SDmitry Monakhov return 0; 169256c50f11SDmitry Monakhov break; 1693ac27a0ecSDave Kleikamp case Opt_grpjquota: 169456c50f11SDmitry Monakhov if (!set_qf_name(sb, GRPQUOTA, &args[0])) 1695ac27a0ecSDave Kleikamp return 0; 1696ac27a0ecSDave Kleikamp break; 1697ac27a0ecSDave Kleikamp case Opt_offusrjquota: 169856c50f11SDmitry Monakhov if (!clear_qf_name(sb, USRQUOTA)) 1699ac27a0ecSDave Kleikamp return 0; 1700ac27a0ecSDave Kleikamp break; 170156c50f11SDmitry Monakhov case Opt_offgrpjquota: 170256c50f11SDmitry Monakhov if (!clear_qf_name(sb, GRPQUOTA)) 170356c50f11SDmitry Monakhov return 0; 170456c50f11SDmitry Monakhov break; 170556c50f11SDmitry Monakhov 1706ac27a0ecSDave Kleikamp case Opt_jqfmt_vfsold: 1707dfc5d03fSJan Kara qfmt = QFMT_VFS_OLD; 1708dfc5d03fSJan Kara goto set_qf_format; 1709ac27a0ecSDave Kleikamp case Opt_jqfmt_vfsv0: 1710dfc5d03fSJan Kara qfmt = QFMT_VFS_V0; 17115a20bdfcSJan Kara goto set_qf_format; 17125a20bdfcSJan Kara case Opt_jqfmt_vfsv1: 17135a20bdfcSJan Kara qfmt = QFMT_VFS_V1; 1714dfc5d03fSJan Kara set_qf_format: 171517bd13b3SJan Kara if (sb_any_quota_loaded(sb) && 1716dfc5d03fSJan Kara sbi->s_jquota_fmt != qfmt) { 1717b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "Cannot change " 1718dfc5d03fSJan Kara "journaled quota options when " 1719b31e1552SEric Sandeen "quota turned on"); 1720dfc5d03fSJan Kara return 0; 1721dfc5d03fSJan Kara } 1722dfc5d03fSJan Kara sbi->s_jquota_fmt = qfmt; 1723ac27a0ecSDave Kleikamp break; 1724ac27a0ecSDave Kleikamp case Opt_quota: 1725ac27a0ecSDave Kleikamp case Opt_usrquota: 1726fd8c37ecSTheodore Ts'o set_opt(sb, QUOTA); 1727fd8c37ecSTheodore Ts'o set_opt(sb, USRQUOTA); 1728ac27a0ecSDave Kleikamp break; 1729ac27a0ecSDave Kleikamp case Opt_grpquota: 1730fd8c37ecSTheodore Ts'o set_opt(sb, QUOTA); 1731fd8c37ecSTheodore Ts'o set_opt(sb, GRPQUOTA); 1732ac27a0ecSDave Kleikamp break; 1733ac27a0ecSDave Kleikamp case Opt_noquota: 173417bd13b3SJan Kara if (sb_any_quota_loaded(sb)) { 1735b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "Cannot change quota " 1736b31e1552SEric Sandeen "options when quota turned on"); 1737ac27a0ecSDave Kleikamp return 0; 1738ac27a0ecSDave Kleikamp } 1739fd8c37ecSTheodore Ts'o clear_opt(sb, QUOTA); 1740fd8c37ecSTheodore Ts'o clear_opt(sb, USRQUOTA); 1741fd8c37ecSTheodore Ts'o clear_opt(sb, GRPQUOTA); 1742ac27a0ecSDave Kleikamp break; 1743ac27a0ecSDave Kleikamp #else 1744ac27a0ecSDave Kleikamp case Opt_quota: 1745ac27a0ecSDave Kleikamp case Opt_usrquota: 1746ac27a0ecSDave Kleikamp case Opt_grpquota: 1747b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, 1748b31e1552SEric Sandeen "quota options not supported"); 1749cd59e7b9SJan Kara break; 1750ac27a0ecSDave Kleikamp case Opt_usrjquota: 1751ac27a0ecSDave Kleikamp case Opt_grpjquota: 1752ac27a0ecSDave Kleikamp case Opt_offusrjquota: 1753ac27a0ecSDave Kleikamp case Opt_offgrpjquota: 1754ac27a0ecSDave Kleikamp case Opt_jqfmt_vfsold: 1755ac27a0ecSDave Kleikamp case Opt_jqfmt_vfsv0: 17565a20bdfcSJan Kara case Opt_jqfmt_vfsv1: 1757b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, 1758b31e1552SEric Sandeen "journaled quota options not supported"); 1759ac27a0ecSDave Kleikamp break; 1760ac27a0ecSDave Kleikamp case Opt_noquota: 1761ac27a0ecSDave Kleikamp break; 1762ac27a0ecSDave Kleikamp #endif 1763ac27a0ecSDave Kleikamp case Opt_abort: 17644ab2f15bSTheodore Ts'o sbi->s_mount_flags |= EXT4_MF_FS_ABORTED; 1765ac27a0ecSDave Kleikamp break; 176606705bffSTheodore Ts'o case Opt_nobarrier: 1767fd8c37ecSTheodore Ts'o clear_opt(sb, BARRIER); 176806705bffSTheodore Ts'o break; 1769ac27a0ecSDave Kleikamp case Opt_barrier: 177015121c18SEric Sandeen if (args[0].from) { 177115121c18SEric Sandeen if (match_int(&args[0], &option)) 177215121c18SEric Sandeen return 0; 177315121c18SEric Sandeen } else 177415121c18SEric Sandeen option = 1; /* No argument, default to 1 */ 1775ac27a0ecSDave Kleikamp if (option) 1776fd8c37ecSTheodore Ts'o set_opt(sb, BARRIER); 1777ac27a0ecSDave Kleikamp else 1778fd8c37ecSTheodore Ts'o clear_opt(sb, BARRIER); 1779ac27a0ecSDave Kleikamp break; 178025ec56b5SJean Noel Cordenner case Opt_i_version: 178125ec56b5SJean Noel Cordenner sb->s_flags |= MS_I_VERSION; 178225ec56b5SJean Noel Cordenner break; 1783dd919b98SAneesh Kumar K.V case Opt_nodelalloc: 1784fd8c37ecSTheodore Ts'o clear_opt(sb, DELALLOC); 178556889787STheodore Ts'o clear_opt2(sb, EXPLICIT_DELALLOC); 1786dd919b98SAneesh Kumar K.V break; 17871449032bSTheodore Ts'o case Opt_mblk_io_submit: 1788fd8c37ecSTheodore Ts'o set_opt(sb, MBLK_IO_SUBMIT); 17891449032bSTheodore Ts'o break; 17901449032bSTheodore Ts'o case Opt_nomblk_io_submit: 1791fd8c37ecSTheodore Ts'o clear_opt(sb, MBLK_IO_SUBMIT); 17921449032bSTheodore Ts'o break; 1793c9de560dSAlex Tomas case Opt_stripe: 1794c9de560dSAlex Tomas if (match_int(&args[0], &option)) 1795c9de560dSAlex Tomas return 0; 1796c9de560dSAlex Tomas if (option < 0) 1797c9de560dSAlex Tomas return 0; 1798c9de560dSAlex Tomas sbi->s_stripe = option; 1799c9de560dSAlex Tomas break; 180064769240SAlex Tomas case Opt_delalloc: 1801fd8c37ecSTheodore Ts'o set_opt(sb, DELALLOC); 180256889787STheodore Ts'o set_opt2(sb, EXPLICIT_DELALLOC); 180364769240SAlex Tomas break; 18046fd058f7STheodore Ts'o case Opt_block_validity: 1805fd8c37ecSTheodore Ts'o set_opt(sb, BLOCK_VALIDITY); 18066fd058f7STheodore Ts'o break; 18076fd058f7STheodore Ts'o case Opt_noblock_validity: 1808fd8c37ecSTheodore Ts'o clear_opt(sb, BLOCK_VALIDITY); 18096fd058f7STheodore Ts'o break; 1810240799cdSTheodore Ts'o case Opt_inode_readahead_blks: 1811240799cdSTheodore Ts'o if (match_int(&args[0], &option)) 1812240799cdSTheodore Ts'o return 0; 1813240799cdSTheodore Ts'o if (option < 0 || option > (1 << 30)) 1814240799cdSTheodore Ts'o return 0; 18155dbd571dSAlexander V. Lukyanov if (option && !is_power_of_2(option)) { 1816b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, 1817b31e1552SEric Sandeen "EXT4-fs: inode_readahead_blks" 1818b31e1552SEric Sandeen " must be a power of 2"); 18193197ebdbSTheodore Ts'o return 0; 18203197ebdbSTheodore Ts'o } 1821240799cdSTheodore Ts'o sbi->s_inode_readahead_blks = option; 1822240799cdSTheodore Ts'o break; 1823b3881f74STheodore Ts'o case Opt_journal_ioprio: 1824b3881f74STheodore Ts'o if (match_int(&args[0], &option)) 1825b3881f74STheodore Ts'o return 0; 1826b3881f74STheodore Ts'o if (option < 0 || option > 7) 1827b3881f74STheodore Ts'o break; 1828b3881f74STheodore Ts'o *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 1829b3881f74STheodore Ts'o option); 1830b3881f74STheodore Ts'o break; 183106705bffSTheodore Ts'o case Opt_noauto_da_alloc: 1832fd8c37ecSTheodore Ts'o set_opt(sb, NO_AUTO_DA_ALLOC); 183306705bffSTheodore Ts'o break; 1834afd4672dSTheodore Ts'o case Opt_auto_da_alloc: 183515121c18SEric Sandeen if (args[0].from) { 183615121c18SEric Sandeen if (match_int(&args[0], &option)) 183715121c18SEric Sandeen return 0; 183815121c18SEric Sandeen } else 183915121c18SEric Sandeen option = 1; /* No argument, default to 1 */ 1840afd4672dSTheodore Ts'o if (option) 1841fd8c37ecSTheodore Ts'o clear_opt(sb, NO_AUTO_DA_ALLOC); 1842afd4672dSTheodore Ts'o else 1843fd8c37ecSTheodore Ts'o set_opt(sb,NO_AUTO_DA_ALLOC); 1844afd4672dSTheodore Ts'o break; 18455328e635SEric Sandeen case Opt_discard: 1846fd8c37ecSTheodore Ts'o set_opt(sb, DISCARD); 18475328e635SEric Sandeen break; 18485328e635SEric Sandeen case Opt_nodiscard: 1849fd8c37ecSTheodore Ts'o clear_opt(sb, DISCARD); 18505328e635SEric Sandeen break; 1851744692dcSJiaying Zhang case Opt_dioread_nolock: 1852fd8c37ecSTheodore Ts'o set_opt(sb, DIOREAD_NOLOCK); 1853744692dcSJiaying Zhang break; 1854744692dcSJiaying Zhang case Opt_dioread_lock: 1855fd8c37ecSTheodore Ts'o clear_opt(sb, DIOREAD_NOLOCK); 1856744692dcSJiaying Zhang break; 1857fc6cb1cdSTheodore Ts'o case Opt_init_itable: 1858fd8c37ecSTheodore Ts'o set_opt(sb, INIT_INODE_TABLE); 1859bfff6873SLukas Czerner if (args[0].from) { 1860bfff6873SLukas Czerner if (match_int(&args[0], &option)) 1861bfff6873SLukas Czerner return 0; 1862bfff6873SLukas Czerner } else 1863bfff6873SLukas Czerner option = EXT4_DEF_LI_WAIT_MULT; 1864bfff6873SLukas Czerner if (option < 0) 1865bfff6873SLukas Czerner return 0; 1866bfff6873SLukas Czerner sbi->s_li_wait_mult = option; 1867bfff6873SLukas Czerner break; 1868fc6cb1cdSTheodore Ts'o case Opt_noinit_itable: 1869fd8c37ecSTheodore Ts'o clear_opt(sb, INIT_INODE_TABLE); 1870bfff6873SLukas Czerner break; 1871ac27a0ecSDave Kleikamp default: 1872b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, 1873b31e1552SEric Sandeen "Unrecognized mount option \"%s\" " 1874b31e1552SEric Sandeen "or missing value", p); 1875ac27a0ecSDave Kleikamp return 0; 1876ac27a0ecSDave Kleikamp } 1877ac27a0ecSDave Kleikamp } 1878ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1879ac27a0ecSDave Kleikamp if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { 1880482a7425SDmitry Monakhov if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA]) 1881fd8c37ecSTheodore Ts'o clear_opt(sb, USRQUOTA); 1882ac27a0ecSDave Kleikamp 1883482a7425SDmitry Monakhov if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA]) 1884fd8c37ecSTheodore Ts'o clear_opt(sb, GRPQUOTA); 1885ac27a0ecSDave Kleikamp 188656c50f11SDmitry Monakhov if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) { 1887b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "old and new quota " 1888b31e1552SEric Sandeen "format mixing"); 1889ac27a0ecSDave Kleikamp return 0; 1890ac27a0ecSDave Kleikamp } 1891ac27a0ecSDave Kleikamp 1892ac27a0ecSDave Kleikamp if (!sbi->s_jquota_fmt) { 1893b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "journaled quota format " 1894b31e1552SEric Sandeen "not specified"); 1895ac27a0ecSDave Kleikamp return 0; 1896ac27a0ecSDave Kleikamp } 1897ac27a0ecSDave Kleikamp } else { 1898ac27a0ecSDave Kleikamp if (sbi->s_jquota_fmt) { 1899b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "journaled quota format " 19002c8be6b2SJan Kara "specified with no journaling " 1901b31e1552SEric Sandeen "enabled"); 1902ac27a0ecSDave Kleikamp return 0; 1903ac27a0ecSDave Kleikamp } 1904ac27a0ecSDave Kleikamp } 1905ac27a0ecSDave Kleikamp #endif 1906ac27a0ecSDave Kleikamp return 1; 1907ac27a0ecSDave Kleikamp } 1908ac27a0ecSDave Kleikamp 1909617ba13bSMingming Cao static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, 1910ac27a0ecSDave Kleikamp int read_only) 1911ac27a0ecSDave Kleikamp { 1912617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 1913ac27a0ecSDave Kleikamp int res = 0; 1914ac27a0ecSDave Kleikamp 1915617ba13bSMingming Cao if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { 1916b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "revision level too high, " 1917b31e1552SEric Sandeen "forcing read-only mode"); 1918ac27a0ecSDave Kleikamp res = MS_RDONLY; 1919ac27a0ecSDave Kleikamp } 1920ac27a0ecSDave Kleikamp if (read_only) 1921281b5995STheodore Ts'o goto done; 1922617ba13bSMingming Cao if (!(sbi->s_mount_state & EXT4_VALID_FS)) 1923b31e1552SEric Sandeen ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, " 1924b31e1552SEric Sandeen "running e2fsck is recommended"); 1925617ba13bSMingming Cao else if ((sbi->s_mount_state & EXT4_ERROR_FS)) 1926b31e1552SEric Sandeen ext4_msg(sb, KERN_WARNING, 1927b31e1552SEric Sandeen "warning: mounting fs with errors, " 1928b31e1552SEric Sandeen "running e2fsck is recommended"); 1929ed3ce80aSTao Ma else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 && 1930ac27a0ecSDave Kleikamp le16_to_cpu(es->s_mnt_count) >= 1931ac27a0ecSDave Kleikamp (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 1932b31e1552SEric Sandeen ext4_msg(sb, KERN_WARNING, 1933b31e1552SEric Sandeen "warning: maximal mount count reached, " 1934b31e1552SEric Sandeen "running e2fsck is recommended"); 1935ac27a0ecSDave Kleikamp else if (le32_to_cpu(es->s_checkinterval) && 1936ac27a0ecSDave Kleikamp (le32_to_cpu(es->s_lastcheck) + 1937ac27a0ecSDave Kleikamp le32_to_cpu(es->s_checkinterval) <= get_seconds())) 1938b31e1552SEric Sandeen ext4_msg(sb, KERN_WARNING, 1939b31e1552SEric Sandeen "warning: checktime reached, " 1940b31e1552SEric Sandeen "running e2fsck is recommended"); 19410390131bSFrank Mayhar if (!sbi->s_journal) 1942216c34b2SMarcin Slusarz es->s_state &= cpu_to_le16(~EXT4_VALID_FS); 1943ac27a0ecSDave Kleikamp if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) 1944617ba13bSMingming Cao es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); 1945e8546d06SMarcin Slusarz le16_add_cpu(&es->s_mnt_count, 1); 1946ac27a0ecSDave Kleikamp es->s_mtime = cpu_to_le32(get_seconds()); 1947617ba13bSMingming Cao ext4_update_dynamic_rev(sb); 19480390131bSFrank Mayhar if (sbi->s_journal) 1949617ba13bSMingming Cao EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 1950ac27a0ecSDave Kleikamp 1951e2d67052STheodore Ts'o ext4_commit_super(sb, 1); 1952281b5995STheodore Ts'o done: 1953ac27a0ecSDave Kleikamp if (test_opt(sb, DEBUG)) 1954a9df9a49STheodore Ts'o printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, " 1955a2595b8aSTheodore Ts'o "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n", 1956ac27a0ecSDave Kleikamp sb->s_blocksize, 1957ac27a0ecSDave Kleikamp sbi->s_groups_count, 1958617ba13bSMingming Cao EXT4_BLOCKS_PER_GROUP(sb), 1959617ba13bSMingming Cao EXT4_INODES_PER_GROUP(sb), 1960a2595b8aSTheodore Ts'o sbi->s_mount_opt, sbi->s_mount_opt2); 1961ac27a0ecSDave Kleikamp 19627abc52c2SDan Magenheimer cleancache_init_fs(sb); 1963ac27a0ecSDave Kleikamp return res; 1964ac27a0ecSDave Kleikamp } 1965ac27a0ecSDave Kleikamp 1966772cb7c8SJose R. Santos static int ext4_fill_flex_info(struct super_block *sb) 1967772cb7c8SJose R. Santos { 1968772cb7c8SJose R. Santos struct ext4_sb_info *sbi = EXT4_SB(sb); 1969772cb7c8SJose R. Santos struct ext4_group_desc *gdp = NULL; 1970772cb7c8SJose R. Santos ext4_group_t flex_group_count; 1971772cb7c8SJose R. Santos ext4_group_t flex_group; 1972d50f2ab6SXi Wang unsigned int groups_per_flex = 0; 1973c5ca7c76STheodore Ts'o size_t size; 1974772cb7c8SJose R. Santos int i; 1975772cb7c8SJose R. Santos 1976503358aeSTheodore Ts'o sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex; 1977d50f2ab6SXi Wang if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) { 1978772cb7c8SJose R. Santos sbi->s_log_groups_per_flex = 0; 1979772cb7c8SJose R. Santos return 1; 1980772cb7c8SJose R. Santos } 1981d50f2ab6SXi Wang groups_per_flex = 1 << sbi->s_log_groups_per_flex; 1982772cb7c8SJose R. Santos 1983c62a11fdSFrederic Bohe /* We allocate both existing and potentially added groups */ 1984c62a11fdSFrederic Bohe flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) + 1985d94e99a6SAneesh Kumar K.V ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) << 1986d94e99a6SAneesh Kumar K.V EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex; 1987c5ca7c76STheodore Ts'o size = flex_group_count * sizeof(struct flex_groups); 19889933fc0aSTheodore Ts'o sbi->s_flex_groups = ext4_kvzalloc(size, GFP_KERNEL); 1989c5ca7c76STheodore Ts'o if (sbi->s_flex_groups == NULL) { 19909933fc0aSTheodore Ts'o ext4_msg(sb, KERN_ERR, "not enough memory for %u flex groups", 199194de56abSJoe Perches flex_group_count); 1992772cb7c8SJose R. Santos goto failed; 1993772cb7c8SJose R. Santos } 1994772cb7c8SJose R. Santos 1995772cb7c8SJose R. Santos for (i = 0; i < sbi->s_groups_count; i++) { 199688b6edd1STheodore Ts'o gdp = ext4_get_group_desc(sb, i, NULL); 1997772cb7c8SJose R. Santos 1998772cb7c8SJose R. Santos flex_group = ext4_flex_group(sbi, i); 19997ad9bb65STheodore Ts'o atomic_add(ext4_free_inodes_count(sb, gdp), 20007ad9bb65STheodore Ts'o &sbi->s_flex_groups[flex_group].free_inodes); 2001021b65bbSTheodore Ts'o atomic_add(ext4_free_group_clusters(sb, gdp), 200224aaa8efSTheodore Ts'o &sbi->s_flex_groups[flex_group].free_clusters); 20037ad9bb65STheodore Ts'o atomic_add(ext4_used_dirs_count(sb, gdp), 20047ad9bb65STheodore Ts'o &sbi->s_flex_groups[flex_group].used_dirs); 2005772cb7c8SJose R. Santos } 2006772cb7c8SJose R. Santos 2007772cb7c8SJose R. Santos return 1; 2008772cb7c8SJose R. Santos failed: 2009772cb7c8SJose R. Santos return 0; 2010772cb7c8SJose R. Santos } 2011772cb7c8SJose R. Santos 2012717d50e4SAndreas Dilger __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group, 2013717d50e4SAndreas Dilger struct ext4_group_desc *gdp) 2014717d50e4SAndreas Dilger { 2015717d50e4SAndreas Dilger __u16 crc = 0; 2016717d50e4SAndreas Dilger 2017717d50e4SAndreas Dilger if (sbi->s_es->s_feature_ro_compat & 2018717d50e4SAndreas Dilger cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { 2019717d50e4SAndreas Dilger int offset = offsetof(struct ext4_group_desc, bg_checksum); 2020717d50e4SAndreas Dilger __le32 le_group = cpu_to_le32(block_group); 2021717d50e4SAndreas Dilger 2022717d50e4SAndreas Dilger crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); 2023717d50e4SAndreas Dilger crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); 2024717d50e4SAndreas Dilger crc = crc16(crc, (__u8 *)gdp, offset); 2025717d50e4SAndreas Dilger offset += sizeof(gdp->bg_checksum); /* skip checksum */ 2026717d50e4SAndreas Dilger /* for checksum of struct ext4_group_desc do the rest...*/ 2027717d50e4SAndreas Dilger if ((sbi->s_es->s_feature_incompat & 2028717d50e4SAndreas Dilger cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) && 2029717d50e4SAndreas Dilger offset < le16_to_cpu(sbi->s_es->s_desc_size)) 2030717d50e4SAndreas Dilger crc = crc16(crc, (__u8 *)gdp + offset, 2031717d50e4SAndreas Dilger le16_to_cpu(sbi->s_es->s_desc_size) - 2032717d50e4SAndreas Dilger offset); 2033717d50e4SAndreas Dilger } 2034717d50e4SAndreas Dilger 2035717d50e4SAndreas Dilger return cpu_to_le16(crc); 2036717d50e4SAndreas Dilger } 2037717d50e4SAndreas Dilger 2038717d50e4SAndreas Dilger int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group, 2039717d50e4SAndreas Dilger struct ext4_group_desc *gdp) 2040717d50e4SAndreas Dilger { 2041717d50e4SAndreas Dilger if ((sbi->s_es->s_feature_ro_compat & 2042717d50e4SAndreas Dilger cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) && 2043717d50e4SAndreas Dilger (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp))) 2044717d50e4SAndreas Dilger return 0; 2045717d50e4SAndreas Dilger 2046717d50e4SAndreas Dilger return 1; 2047717d50e4SAndreas Dilger } 2048717d50e4SAndreas Dilger 2049ac27a0ecSDave Kleikamp /* Called at mount-time, super-block is locked */ 2050bfff6873SLukas Czerner static int ext4_check_descriptors(struct super_block *sb, 2051bfff6873SLukas Czerner ext4_group_t *first_not_zeroed) 2052ac27a0ecSDave Kleikamp { 2053617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 2054617ba13bSMingming Cao ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); 2055617ba13bSMingming Cao ext4_fsblk_t last_block; 2056bd81d8eeSLaurent Vivier ext4_fsblk_t block_bitmap; 2057bd81d8eeSLaurent Vivier ext4_fsblk_t inode_bitmap; 2058bd81d8eeSLaurent Vivier ext4_fsblk_t inode_table; 2059ce421581SJose R. Santos int flexbg_flag = 0; 2060bfff6873SLukas Czerner ext4_group_t i, grp = sbi->s_groups_count; 2061ac27a0ecSDave Kleikamp 2062ce421581SJose R. Santos if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 2063ce421581SJose R. Santos flexbg_flag = 1; 2064ce421581SJose R. Santos 2065617ba13bSMingming Cao ext4_debug("Checking group descriptors"); 2066ac27a0ecSDave Kleikamp 2067197cd65aSAkinobu Mita for (i = 0; i < sbi->s_groups_count; i++) { 2068197cd65aSAkinobu Mita struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); 2069197cd65aSAkinobu Mita 2070ce421581SJose R. Santos if (i == sbi->s_groups_count - 1 || flexbg_flag) 2071bd81d8eeSLaurent Vivier last_block = ext4_blocks_count(sbi->s_es) - 1; 2072ac27a0ecSDave Kleikamp else 2073ac27a0ecSDave Kleikamp last_block = first_block + 2074617ba13bSMingming Cao (EXT4_BLOCKS_PER_GROUP(sb) - 1); 2075ac27a0ecSDave Kleikamp 2076bfff6873SLukas Czerner if ((grp == sbi->s_groups_count) && 2077bfff6873SLukas Czerner !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) 2078bfff6873SLukas Czerner grp = i; 2079bfff6873SLukas Czerner 20808fadc143SAlexandre Ratchov block_bitmap = ext4_block_bitmap(sb, gdp); 20812b2d6d01STheodore Ts'o if (block_bitmap < first_block || block_bitmap > last_block) { 2082b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2083a9df9a49STheodore Ts'o "Block bitmap for group %u not in group " 2084b31e1552SEric Sandeen "(block %llu)!", i, block_bitmap); 2085ac27a0ecSDave Kleikamp return 0; 2086ac27a0ecSDave Kleikamp } 20878fadc143SAlexandre Ratchov inode_bitmap = ext4_inode_bitmap(sb, gdp); 20882b2d6d01STheodore Ts'o if (inode_bitmap < first_block || inode_bitmap > last_block) { 2089b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2090a9df9a49STheodore Ts'o "Inode bitmap for group %u not in group " 2091b31e1552SEric Sandeen "(block %llu)!", i, inode_bitmap); 2092ac27a0ecSDave Kleikamp return 0; 2093ac27a0ecSDave Kleikamp } 20948fadc143SAlexandre Ratchov inode_table = ext4_inode_table(sb, gdp); 2095bd81d8eeSLaurent Vivier if (inode_table < first_block || 20962b2d6d01STheodore Ts'o inode_table + sbi->s_itb_per_group - 1 > last_block) { 2097b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2098a9df9a49STheodore Ts'o "Inode table for group %u not in group " 2099b31e1552SEric Sandeen "(block %llu)!", i, inode_table); 2100ac27a0ecSDave Kleikamp return 0; 2101ac27a0ecSDave Kleikamp } 2102955ce5f5SAneesh Kumar K.V ext4_lock_group(sb, i); 2103717d50e4SAndreas Dilger if (!ext4_group_desc_csum_verify(sbi, i, gdp)) { 2104b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 2105b31e1552SEric Sandeen "Checksum for group %u failed (%u!=%u)", 2106fd2d4291SAvantika Mathur i, le16_to_cpu(ext4_group_desc_csum(sbi, i, 2107fd2d4291SAvantika Mathur gdp)), le16_to_cpu(gdp->bg_checksum)); 21087ee1ec4cSLi Zefan if (!(sb->s_flags & MS_RDONLY)) { 2109955ce5f5SAneesh Kumar K.V ext4_unlock_group(sb, i); 2110717d50e4SAndreas Dilger return 0; 2111717d50e4SAndreas Dilger } 21127ee1ec4cSLi Zefan } 2113955ce5f5SAneesh Kumar K.V ext4_unlock_group(sb, i); 2114ce421581SJose R. Santos if (!flexbg_flag) 2115617ba13bSMingming Cao first_block += EXT4_BLOCKS_PER_GROUP(sb); 2116ac27a0ecSDave Kleikamp } 2117bfff6873SLukas Czerner if (NULL != first_not_zeroed) 2118bfff6873SLukas Czerner *first_not_zeroed = grp; 2119ac27a0ecSDave Kleikamp 21205dee5437STheodore Ts'o ext4_free_blocks_count_set(sbi->s_es, 21215dee5437STheodore Ts'o EXT4_C2B(sbi, ext4_count_free_clusters(sb))); 2122617ba13bSMingming Cao sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb)); 2123ac27a0ecSDave Kleikamp return 1; 2124ac27a0ecSDave Kleikamp } 2125ac27a0ecSDave Kleikamp 2126617ba13bSMingming Cao /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at 2127ac27a0ecSDave Kleikamp * the superblock) which were deleted from all directories, but held open by 2128ac27a0ecSDave Kleikamp * a process at the time of a crash. We walk the list and try to delete these 2129ac27a0ecSDave Kleikamp * inodes at recovery time (only with a read-write filesystem). 2130ac27a0ecSDave Kleikamp * 2131ac27a0ecSDave Kleikamp * In order to keep the orphan inode chain consistent during traversal (in 2132ac27a0ecSDave Kleikamp * case of crash during recovery), we link each inode into the superblock 2133ac27a0ecSDave Kleikamp * orphan list_head and handle it the same way as an inode deletion during 2134ac27a0ecSDave Kleikamp * normal operation (which journals the operations for us). 2135ac27a0ecSDave Kleikamp * 2136ac27a0ecSDave Kleikamp * We only do an iget() and an iput() on each inode, which is very safe if we 2137ac27a0ecSDave Kleikamp * accidentally point at an in-use or already deleted inode. The worst that 2138ac27a0ecSDave Kleikamp * can happen in this case is that we get a "bit already cleared" message from 2139617ba13bSMingming Cao * ext4_free_inode(). The only reason we would point at a wrong inode is if 2140ac27a0ecSDave Kleikamp * e2fsck was run on this filesystem, and it must have already done the orphan 2141ac27a0ecSDave Kleikamp * inode cleanup for us, so we can safely abort without any further action. 2142ac27a0ecSDave Kleikamp */ 2143617ba13bSMingming Cao static void ext4_orphan_cleanup(struct super_block *sb, 2144617ba13bSMingming Cao struct ext4_super_block *es) 2145ac27a0ecSDave Kleikamp { 2146ac27a0ecSDave Kleikamp unsigned int s_flags = sb->s_flags; 2147ac27a0ecSDave Kleikamp int nr_orphans = 0, nr_truncates = 0; 2148ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 2149ac27a0ecSDave Kleikamp int i; 2150ac27a0ecSDave Kleikamp #endif 2151ac27a0ecSDave Kleikamp if (!es->s_last_orphan) { 2152ac27a0ecSDave Kleikamp jbd_debug(4, "no orphan inodes to clean up\n"); 2153ac27a0ecSDave Kleikamp return; 2154ac27a0ecSDave Kleikamp } 2155ac27a0ecSDave Kleikamp 2156a8f48a95SEric Sandeen if (bdev_read_only(sb->s_bdev)) { 2157b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "write access " 2158b31e1552SEric Sandeen "unavailable, skipping orphan cleanup"); 2159a8f48a95SEric Sandeen return; 2160a8f48a95SEric Sandeen } 2161a8f48a95SEric Sandeen 2162d39195c3SAmir Goldstein /* Check if feature set would not allow a r/w mount */ 2163d39195c3SAmir Goldstein if (!ext4_feature_set_ok(sb, 0)) { 2164d39195c3SAmir Goldstein ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to " 2165d39195c3SAmir Goldstein "unknown ROCOMPAT features"); 2166d39195c3SAmir Goldstein return; 2167d39195c3SAmir Goldstein } 2168d39195c3SAmir Goldstein 2169617ba13bSMingming Cao if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { 2170ac27a0ecSDave Kleikamp if (es->s_last_orphan) 2171ac27a0ecSDave Kleikamp jbd_debug(1, "Errors on filesystem, " 2172ac27a0ecSDave Kleikamp "clearing orphan list.\n"); 2173ac27a0ecSDave Kleikamp es->s_last_orphan = 0; 2174ac27a0ecSDave Kleikamp jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); 2175ac27a0ecSDave Kleikamp return; 2176ac27a0ecSDave Kleikamp } 2177ac27a0ecSDave Kleikamp 2178ac27a0ecSDave Kleikamp if (s_flags & MS_RDONLY) { 2179b31e1552SEric Sandeen ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs"); 2180ac27a0ecSDave Kleikamp sb->s_flags &= ~MS_RDONLY; 2181ac27a0ecSDave Kleikamp } 2182ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 2183ac27a0ecSDave Kleikamp /* Needed for iput() to work correctly and not trash data */ 2184ac27a0ecSDave Kleikamp sb->s_flags |= MS_ACTIVE; 2185ac27a0ecSDave Kleikamp /* Turn on quotas so that they are updated correctly */ 2186ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) { 2187617ba13bSMingming Cao if (EXT4_SB(sb)->s_qf_names[i]) { 2188617ba13bSMingming Cao int ret = ext4_quota_on_mount(sb, i); 2189ac27a0ecSDave Kleikamp if (ret < 0) 2190b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, 2191b31e1552SEric Sandeen "Cannot turn on journaled " 2192b31e1552SEric Sandeen "quota: error %d", ret); 2193ac27a0ecSDave Kleikamp } 2194ac27a0ecSDave Kleikamp } 2195ac27a0ecSDave Kleikamp #endif 2196ac27a0ecSDave Kleikamp 2197ac27a0ecSDave Kleikamp while (es->s_last_orphan) { 2198ac27a0ecSDave Kleikamp struct inode *inode; 2199ac27a0ecSDave Kleikamp 220097bd42b9SJosef Bacik inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); 220197bd42b9SJosef Bacik if (IS_ERR(inode)) { 2202ac27a0ecSDave Kleikamp es->s_last_orphan = 0; 2203ac27a0ecSDave Kleikamp break; 2204ac27a0ecSDave Kleikamp } 2205ac27a0ecSDave Kleikamp 2206617ba13bSMingming Cao list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); 2207871a2931SChristoph Hellwig dquot_initialize(inode); 2208ac27a0ecSDave Kleikamp if (inode->i_nlink) { 2209b31e1552SEric Sandeen ext4_msg(sb, KERN_DEBUG, 2210b31e1552SEric Sandeen "%s: truncating inode %lu to %lld bytes", 221146e665e9SHarvey Harrison __func__, inode->i_ino, inode->i_size); 2212e5f8eab8STheodore Ts'o jbd_debug(2, "truncating inode %lu to %lld bytes\n", 2213ac27a0ecSDave Kleikamp inode->i_ino, inode->i_size); 2214617ba13bSMingming Cao ext4_truncate(inode); 2215ac27a0ecSDave Kleikamp nr_truncates++; 2216ac27a0ecSDave Kleikamp } else { 2217b31e1552SEric Sandeen ext4_msg(sb, KERN_DEBUG, 2218b31e1552SEric Sandeen "%s: deleting unreferenced inode %lu", 221946e665e9SHarvey Harrison __func__, inode->i_ino); 2220ac27a0ecSDave Kleikamp jbd_debug(2, "deleting unreferenced inode %lu\n", 2221ac27a0ecSDave Kleikamp inode->i_ino); 2222ac27a0ecSDave Kleikamp nr_orphans++; 2223ac27a0ecSDave Kleikamp } 2224ac27a0ecSDave Kleikamp iput(inode); /* The delete magic happens here! */ 2225ac27a0ecSDave Kleikamp } 2226ac27a0ecSDave Kleikamp 2227ac27a0ecSDave Kleikamp #define PLURAL(x) (x), ((x) == 1) ? "" : "s" 2228ac27a0ecSDave Kleikamp 2229ac27a0ecSDave Kleikamp if (nr_orphans) 2230b31e1552SEric Sandeen ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted", 2231b31e1552SEric Sandeen PLURAL(nr_orphans)); 2232ac27a0ecSDave Kleikamp if (nr_truncates) 2233b31e1552SEric Sandeen ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up", 2234b31e1552SEric Sandeen PLURAL(nr_truncates)); 2235ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 2236ac27a0ecSDave Kleikamp /* Turn quotas off */ 2237ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) { 2238ac27a0ecSDave Kleikamp if (sb_dqopt(sb)->files[i]) 2239287a8095SChristoph Hellwig dquot_quota_off(sb, i); 2240ac27a0ecSDave Kleikamp } 2241ac27a0ecSDave Kleikamp #endif 2242ac27a0ecSDave Kleikamp sb->s_flags = s_flags; /* Restore MS_RDONLY status */ 2243ac27a0ecSDave Kleikamp } 22440b8e58a1SAndreas Dilger 2245cd2291a4SEric Sandeen /* 2246cd2291a4SEric Sandeen * Maximal extent format file size. 2247cd2291a4SEric Sandeen * Resulting logical blkno at s_maxbytes must fit in our on-disk 2248cd2291a4SEric Sandeen * extent format containers, within a sector_t, and within i_blocks 2249cd2291a4SEric Sandeen * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, 2250cd2291a4SEric Sandeen * so that won't be a limiting factor. 2251cd2291a4SEric Sandeen * 2252f17722f9SLukas Czerner * However there is other limiting factor. We do store extents in the form 2253f17722f9SLukas Czerner * of starting block and length, hence the resulting length of the extent 2254f17722f9SLukas Czerner * covering maximum file size must fit into on-disk format containers as 2255f17722f9SLukas Czerner * well. Given that length is always by 1 unit bigger than max unit (because 2256f17722f9SLukas Czerner * we count 0 as well) we have to lower the s_maxbytes by one fs block. 2257f17722f9SLukas Czerner * 2258cd2291a4SEric Sandeen * Note, this does *not* consider any metadata overhead for vfs i_blocks. 2259cd2291a4SEric Sandeen */ 2260f287a1a5STheodore Ts'o static loff_t ext4_max_size(int blkbits, int has_huge_files) 2261cd2291a4SEric Sandeen { 2262cd2291a4SEric Sandeen loff_t res; 2263cd2291a4SEric Sandeen loff_t upper_limit = MAX_LFS_FILESIZE; 2264cd2291a4SEric Sandeen 2265cd2291a4SEric Sandeen /* small i_blocks in vfs inode? */ 2266f287a1a5STheodore Ts'o if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { 2267cd2291a4SEric Sandeen /* 226890c699a9SBartlomiej Zolnierkiewicz * CONFIG_LBDAF is not enabled implies the inode 2269cd2291a4SEric Sandeen * i_block represent total blocks in 512 bytes 2270cd2291a4SEric Sandeen * 32 == size of vfs inode i_blocks * 8 2271cd2291a4SEric Sandeen */ 2272cd2291a4SEric Sandeen upper_limit = (1LL << 32) - 1; 2273cd2291a4SEric Sandeen 2274cd2291a4SEric Sandeen /* total blocks in file system block size */ 2275cd2291a4SEric Sandeen upper_limit >>= (blkbits - 9); 2276cd2291a4SEric Sandeen upper_limit <<= blkbits; 2277cd2291a4SEric Sandeen } 2278cd2291a4SEric Sandeen 2279f17722f9SLukas Czerner /* 2280f17722f9SLukas Czerner * 32-bit extent-start container, ee_block. We lower the maxbytes 2281f17722f9SLukas Czerner * by one fs block, so ee_len can cover the extent of maximum file 2282f17722f9SLukas Czerner * size 2283f17722f9SLukas Czerner */ 2284f17722f9SLukas Czerner res = (1LL << 32) - 1; 2285cd2291a4SEric Sandeen res <<= blkbits; 2286cd2291a4SEric Sandeen 2287cd2291a4SEric Sandeen /* Sanity check against vm- & vfs- imposed limits */ 2288cd2291a4SEric Sandeen if (res > upper_limit) 2289cd2291a4SEric Sandeen res = upper_limit; 2290cd2291a4SEric Sandeen 2291cd2291a4SEric Sandeen return res; 2292cd2291a4SEric Sandeen } 2293ac27a0ecSDave Kleikamp 2294ac27a0ecSDave Kleikamp /* 2295cd2291a4SEric Sandeen * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect 22960fc1b451SAneesh Kumar K.V * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. 22970fc1b451SAneesh Kumar K.V * We need to be 1 filesystem block less than the 2^48 sector limit. 2298ac27a0ecSDave Kleikamp */ 2299f287a1a5STheodore Ts'o static loff_t ext4_max_bitmap_size(int bits, int has_huge_files) 2300ac27a0ecSDave Kleikamp { 2301617ba13bSMingming Cao loff_t res = EXT4_NDIR_BLOCKS; 23020fc1b451SAneesh Kumar K.V int meta_blocks; 23030fc1b451SAneesh Kumar K.V loff_t upper_limit; 23040b8e58a1SAndreas Dilger /* This is calculated to be the largest file size for a dense, block 23050b8e58a1SAndreas Dilger * mapped file such that the file's total number of 512-byte sectors, 23060b8e58a1SAndreas Dilger * including data and all indirect blocks, does not exceed (2^48 - 1). 23070b8e58a1SAndreas Dilger * 23080b8e58a1SAndreas Dilger * __u32 i_blocks_lo and _u16 i_blocks_high represent the total 23090b8e58a1SAndreas Dilger * number of 512-byte sectors of the file. 23100fc1b451SAneesh Kumar K.V */ 23110fc1b451SAneesh Kumar K.V 2312f287a1a5STheodore Ts'o if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { 23130fc1b451SAneesh Kumar K.V /* 231490c699a9SBartlomiej Zolnierkiewicz * !has_huge_files or CONFIG_LBDAF not enabled implies that 23150b8e58a1SAndreas Dilger * the inode i_block field represents total file blocks in 23160b8e58a1SAndreas Dilger * 2^32 512-byte sectors == size of vfs inode i_blocks * 8 23170fc1b451SAneesh Kumar K.V */ 23180fc1b451SAneesh Kumar K.V upper_limit = (1LL << 32) - 1; 23190fc1b451SAneesh Kumar K.V 23200fc1b451SAneesh Kumar K.V /* total blocks in file system block size */ 23210fc1b451SAneesh Kumar K.V upper_limit >>= (bits - 9); 23220fc1b451SAneesh Kumar K.V 23230fc1b451SAneesh Kumar K.V } else { 23248180a562SAneesh Kumar K.V /* 23258180a562SAneesh Kumar K.V * We use 48 bit ext4_inode i_blocks 23268180a562SAneesh Kumar K.V * With EXT4_HUGE_FILE_FL set the i_blocks 23278180a562SAneesh Kumar K.V * represent total number of blocks in 23288180a562SAneesh Kumar K.V * file system block size 23298180a562SAneesh Kumar K.V */ 23300fc1b451SAneesh Kumar K.V upper_limit = (1LL << 48) - 1; 23310fc1b451SAneesh Kumar K.V 23320fc1b451SAneesh Kumar K.V } 23330fc1b451SAneesh Kumar K.V 23340fc1b451SAneesh Kumar K.V /* indirect blocks */ 23350fc1b451SAneesh Kumar K.V meta_blocks = 1; 23360fc1b451SAneesh Kumar K.V /* double indirect blocks */ 23370fc1b451SAneesh Kumar K.V meta_blocks += 1 + (1LL << (bits-2)); 23380fc1b451SAneesh Kumar K.V /* tripple indirect blocks */ 23390fc1b451SAneesh Kumar K.V meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); 23400fc1b451SAneesh Kumar K.V 23410fc1b451SAneesh Kumar K.V upper_limit -= meta_blocks; 23420fc1b451SAneesh Kumar K.V upper_limit <<= bits; 2343ac27a0ecSDave Kleikamp 2344ac27a0ecSDave Kleikamp res += 1LL << (bits-2); 2345ac27a0ecSDave Kleikamp res += 1LL << (2*(bits-2)); 2346ac27a0ecSDave Kleikamp res += 1LL << (3*(bits-2)); 2347ac27a0ecSDave Kleikamp res <<= bits; 2348ac27a0ecSDave Kleikamp if (res > upper_limit) 2349ac27a0ecSDave Kleikamp res = upper_limit; 23500fc1b451SAneesh Kumar K.V 23510fc1b451SAneesh Kumar K.V if (res > MAX_LFS_FILESIZE) 23520fc1b451SAneesh Kumar K.V res = MAX_LFS_FILESIZE; 23530fc1b451SAneesh Kumar K.V 2354ac27a0ecSDave Kleikamp return res; 2355ac27a0ecSDave Kleikamp } 2356ac27a0ecSDave Kleikamp 2357617ba13bSMingming Cao static ext4_fsblk_t descriptor_loc(struct super_block *sb, 235870bbb3e0SAndrew Morton ext4_fsblk_t logical_sb_block, int nr) 2359ac27a0ecSDave Kleikamp { 2360617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 2361fd2d4291SAvantika Mathur ext4_group_t bg, first_meta_bg; 2362ac27a0ecSDave Kleikamp int has_super = 0; 2363ac27a0ecSDave Kleikamp 2364ac27a0ecSDave Kleikamp first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 2365ac27a0ecSDave Kleikamp 2366617ba13bSMingming Cao if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || 2367ac27a0ecSDave Kleikamp nr < first_meta_bg) 236870bbb3e0SAndrew Morton return logical_sb_block + nr + 1; 2369ac27a0ecSDave Kleikamp bg = sbi->s_desc_per_block * nr; 2370617ba13bSMingming Cao if (ext4_bg_has_super(sb, bg)) 2371ac27a0ecSDave Kleikamp has_super = 1; 23720b8e58a1SAndreas Dilger 2373617ba13bSMingming Cao return (has_super + ext4_group_first_block_no(sb, bg)); 2374ac27a0ecSDave Kleikamp } 2375ac27a0ecSDave Kleikamp 2376c9de560dSAlex Tomas /** 2377c9de560dSAlex Tomas * ext4_get_stripe_size: Get the stripe size. 2378c9de560dSAlex Tomas * @sbi: In memory super block info 2379c9de560dSAlex Tomas * 2380c9de560dSAlex Tomas * If we have specified it via mount option, then 2381c9de560dSAlex Tomas * use the mount option value. If the value specified at mount time is 2382c9de560dSAlex Tomas * greater than the blocks per group use the super block value. 2383c9de560dSAlex Tomas * If the super block value is greater than blocks per group return 0. 2384c9de560dSAlex Tomas * Allocator needs it be less than blocks per group. 2385c9de560dSAlex Tomas * 2386c9de560dSAlex Tomas */ 2387c9de560dSAlex Tomas static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) 2388c9de560dSAlex Tomas { 2389c9de560dSAlex Tomas unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); 2390c9de560dSAlex Tomas unsigned long stripe_width = 2391c9de560dSAlex Tomas le32_to_cpu(sbi->s_es->s_raid_stripe_width); 23923eb08658SDan Ehrenberg int ret; 2393c9de560dSAlex Tomas 2394c9de560dSAlex Tomas if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) 23953eb08658SDan Ehrenberg ret = sbi->s_stripe; 23963eb08658SDan Ehrenberg else if (stripe_width <= sbi->s_blocks_per_group) 23973eb08658SDan Ehrenberg ret = stripe_width; 23983eb08658SDan Ehrenberg else if (stride <= sbi->s_blocks_per_group) 23993eb08658SDan Ehrenberg ret = stride; 24003eb08658SDan Ehrenberg else 24013eb08658SDan Ehrenberg ret = 0; 2402c9de560dSAlex Tomas 24033eb08658SDan Ehrenberg /* 24043eb08658SDan Ehrenberg * If the stripe width is 1, this makes no sense and 24053eb08658SDan Ehrenberg * we set it to 0 to turn off stripe handling code. 24063eb08658SDan Ehrenberg */ 24073eb08658SDan Ehrenberg if (ret <= 1) 24083eb08658SDan Ehrenberg ret = 0; 2409c9de560dSAlex Tomas 24103eb08658SDan Ehrenberg return ret; 2411c9de560dSAlex Tomas } 2412ac27a0ecSDave Kleikamp 24133197ebdbSTheodore Ts'o /* sysfs supprt */ 24143197ebdbSTheodore Ts'o 24153197ebdbSTheodore Ts'o struct ext4_attr { 24163197ebdbSTheodore Ts'o struct attribute attr; 24173197ebdbSTheodore Ts'o ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *); 24183197ebdbSTheodore Ts'o ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *, 24193197ebdbSTheodore Ts'o const char *, size_t); 24203197ebdbSTheodore Ts'o int offset; 24213197ebdbSTheodore Ts'o }; 24223197ebdbSTheodore Ts'o 24233197ebdbSTheodore Ts'o static int parse_strtoul(const char *buf, 24243197ebdbSTheodore Ts'o unsigned long max, unsigned long *value) 24253197ebdbSTheodore Ts'o { 24263197ebdbSTheodore Ts'o char *endp; 24273197ebdbSTheodore Ts'o 2428e7d2860bSAndré Goddard Rosa *value = simple_strtoul(skip_spaces(buf), &endp, 0); 2429e7d2860bSAndré Goddard Rosa endp = skip_spaces(endp); 24303197ebdbSTheodore Ts'o if (*endp || *value > max) 24313197ebdbSTheodore Ts'o return -EINVAL; 24323197ebdbSTheodore Ts'o 24333197ebdbSTheodore Ts'o return 0; 24343197ebdbSTheodore Ts'o } 24353197ebdbSTheodore Ts'o 24363197ebdbSTheodore Ts'o static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a, 24373197ebdbSTheodore Ts'o struct ext4_sb_info *sbi, 24383197ebdbSTheodore Ts'o char *buf) 24393197ebdbSTheodore Ts'o { 24403197ebdbSTheodore Ts'o return snprintf(buf, PAGE_SIZE, "%llu\n", 24417b415bf6SAditya Kali (s64) EXT4_C2B(sbi, 24427b415bf6SAditya Kali percpu_counter_sum(&sbi->s_dirtyclusters_counter))); 24433197ebdbSTheodore Ts'o } 24443197ebdbSTheodore Ts'o 24453197ebdbSTheodore Ts'o static ssize_t session_write_kbytes_show(struct ext4_attr *a, 24463197ebdbSTheodore Ts'o struct ext4_sb_info *sbi, char *buf) 24473197ebdbSTheodore Ts'o { 24483197ebdbSTheodore Ts'o struct super_block *sb = sbi->s_buddy_cache->i_sb; 24493197ebdbSTheodore Ts'o 2450f613dfcbSTheodore Ts'o if (!sb->s_bdev->bd_part) 2451f613dfcbSTheodore Ts'o return snprintf(buf, PAGE_SIZE, "0\n"); 24523197ebdbSTheodore Ts'o return snprintf(buf, PAGE_SIZE, "%lu\n", 24533197ebdbSTheodore Ts'o (part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 24543197ebdbSTheodore Ts'o sbi->s_sectors_written_start) >> 1); 24553197ebdbSTheodore Ts'o } 24563197ebdbSTheodore Ts'o 24573197ebdbSTheodore Ts'o static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a, 24583197ebdbSTheodore Ts'o struct ext4_sb_info *sbi, char *buf) 24593197ebdbSTheodore Ts'o { 24603197ebdbSTheodore Ts'o struct super_block *sb = sbi->s_buddy_cache->i_sb; 24613197ebdbSTheodore Ts'o 2462f613dfcbSTheodore Ts'o if (!sb->s_bdev->bd_part) 2463f613dfcbSTheodore Ts'o return snprintf(buf, PAGE_SIZE, "0\n"); 24643197ebdbSTheodore Ts'o return snprintf(buf, PAGE_SIZE, "%llu\n", 2465a6b43e38SAndrew Morton (unsigned long long)(sbi->s_kbytes_written + 24663197ebdbSTheodore Ts'o ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 2467a6b43e38SAndrew Morton EXT4_SB(sb)->s_sectors_written_start) >> 1))); 24683197ebdbSTheodore Ts'o } 24693197ebdbSTheodore Ts'o 247077f4135fSVivek Haldar static ssize_t extent_cache_hits_show(struct ext4_attr *a, 247177f4135fSVivek Haldar struct ext4_sb_info *sbi, char *buf) 247277f4135fSVivek Haldar { 247377f4135fSVivek Haldar return snprintf(buf, PAGE_SIZE, "%lu\n", sbi->extent_cache_hits); 247477f4135fSVivek Haldar } 247577f4135fSVivek Haldar 247677f4135fSVivek Haldar static ssize_t extent_cache_misses_show(struct ext4_attr *a, 247777f4135fSVivek Haldar struct ext4_sb_info *sbi, char *buf) 247877f4135fSVivek Haldar { 247977f4135fSVivek Haldar return snprintf(buf, PAGE_SIZE, "%lu\n", sbi->extent_cache_misses); 248077f4135fSVivek Haldar } 248177f4135fSVivek Haldar 24823197ebdbSTheodore Ts'o static ssize_t inode_readahead_blks_store(struct ext4_attr *a, 24833197ebdbSTheodore Ts'o struct ext4_sb_info *sbi, 24843197ebdbSTheodore Ts'o const char *buf, size_t count) 24853197ebdbSTheodore Ts'o { 24863197ebdbSTheodore Ts'o unsigned long t; 24873197ebdbSTheodore Ts'o 24883197ebdbSTheodore Ts'o if (parse_strtoul(buf, 0x40000000, &t)) 24893197ebdbSTheodore Ts'o return -EINVAL; 24903197ebdbSTheodore Ts'o 24915dbd571dSAlexander V. Lukyanov if (t && !is_power_of_2(t)) 24923197ebdbSTheodore Ts'o return -EINVAL; 24933197ebdbSTheodore Ts'o 24943197ebdbSTheodore Ts'o sbi->s_inode_readahead_blks = t; 24953197ebdbSTheodore Ts'o return count; 24963197ebdbSTheodore Ts'o } 24973197ebdbSTheodore Ts'o 24983197ebdbSTheodore Ts'o static ssize_t sbi_ui_show(struct ext4_attr *a, 24993197ebdbSTheodore Ts'o struct ext4_sb_info *sbi, char *buf) 25003197ebdbSTheodore Ts'o { 25013197ebdbSTheodore Ts'o unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset); 25023197ebdbSTheodore Ts'o 25033197ebdbSTheodore Ts'o return snprintf(buf, PAGE_SIZE, "%u\n", *ui); 25043197ebdbSTheodore Ts'o } 25053197ebdbSTheodore Ts'o 25063197ebdbSTheodore Ts'o static ssize_t sbi_ui_store(struct ext4_attr *a, 25073197ebdbSTheodore Ts'o struct ext4_sb_info *sbi, 25083197ebdbSTheodore Ts'o const char *buf, size_t count) 25093197ebdbSTheodore Ts'o { 25103197ebdbSTheodore Ts'o unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset); 25113197ebdbSTheodore Ts'o unsigned long t; 25123197ebdbSTheodore Ts'o 25133197ebdbSTheodore Ts'o if (parse_strtoul(buf, 0xffffffff, &t)) 25143197ebdbSTheodore Ts'o return -EINVAL; 25153197ebdbSTheodore Ts'o *ui = t; 25163197ebdbSTheodore Ts'o return count; 25173197ebdbSTheodore Ts'o } 25183197ebdbSTheodore Ts'o 25193197ebdbSTheodore Ts'o #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \ 25203197ebdbSTheodore Ts'o static struct ext4_attr ext4_attr_##_name = { \ 25213197ebdbSTheodore Ts'o .attr = {.name = __stringify(_name), .mode = _mode }, \ 25223197ebdbSTheodore Ts'o .show = _show, \ 25233197ebdbSTheodore Ts'o .store = _store, \ 25243197ebdbSTheodore Ts'o .offset = offsetof(struct ext4_sb_info, _elname), \ 25253197ebdbSTheodore Ts'o } 25263197ebdbSTheodore Ts'o #define EXT4_ATTR(name, mode, show, store) \ 25273197ebdbSTheodore Ts'o static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store) 25283197ebdbSTheodore Ts'o 2529857ac889SLukas Czerner #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL) 25303197ebdbSTheodore Ts'o #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL) 25313197ebdbSTheodore Ts'o #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store) 25323197ebdbSTheodore Ts'o #define EXT4_RW_ATTR_SBI_UI(name, elname) \ 25333197ebdbSTheodore Ts'o EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname) 25343197ebdbSTheodore Ts'o #define ATTR_LIST(name) &ext4_attr_##name.attr 25353197ebdbSTheodore Ts'o 25363197ebdbSTheodore Ts'o EXT4_RO_ATTR(delayed_allocation_blocks); 25373197ebdbSTheodore Ts'o EXT4_RO_ATTR(session_write_kbytes); 25383197ebdbSTheodore Ts'o EXT4_RO_ATTR(lifetime_write_kbytes); 253977f4135fSVivek Haldar EXT4_RO_ATTR(extent_cache_hits); 254077f4135fSVivek Haldar EXT4_RO_ATTR(extent_cache_misses); 25413197ebdbSTheodore Ts'o EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show, 25423197ebdbSTheodore Ts'o inode_readahead_blks_store, s_inode_readahead_blks); 254311013911SAndreas Dilger EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal); 25443197ebdbSTheodore Ts'o EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats); 25453197ebdbSTheodore Ts'o EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan); 25463197ebdbSTheodore Ts'o EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan); 25473197ebdbSTheodore Ts'o EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs); 25483197ebdbSTheodore Ts'o EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request); 25493197ebdbSTheodore Ts'o EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc); 255055138e0bSTheodore Ts'o EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump); 25513197ebdbSTheodore Ts'o 25523197ebdbSTheodore Ts'o static struct attribute *ext4_attrs[] = { 25533197ebdbSTheodore Ts'o ATTR_LIST(delayed_allocation_blocks), 25543197ebdbSTheodore Ts'o ATTR_LIST(session_write_kbytes), 25553197ebdbSTheodore Ts'o ATTR_LIST(lifetime_write_kbytes), 255677f4135fSVivek Haldar ATTR_LIST(extent_cache_hits), 255777f4135fSVivek Haldar ATTR_LIST(extent_cache_misses), 25583197ebdbSTheodore Ts'o ATTR_LIST(inode_readahead_blks), 255911013911SAndreas Dilger ATTR_LIST(inode_goal), 25603197ebdbSTheodore Ts'o ATTR_LIST(mb_stats), 25613197ebdbSTheodore Ts'o ATTR_LIST(mb_max_to_scan), 25623197ebdbSTheodore Ts'o ATTR_LIST(mb_min_to_scan), 25633197ebdbSTheodore Ts'o ATTR_LIST(mb_order2_req), 25643197ebdbSTheodore Ts'o ATTR_LIST(mb_stream_req), 25653197ebdbSTheodore Ts'o ATTR_LIST(mb_group_prealloc), 256655138e0bSTheodore Ts'o ATTR_LIST(max_writeback_mb_bump), 25673197ebdbSTheodore Ts'o NULL, 25683197ebdbSTheodore Ts'o }; 25693197ebdbSTheodore Ts'o 2570857ac889SLukas Czerner /* Features this copy of ext4 supports */ 2571857ac889SLukas Czerner EXT4_INFO_ATTR(lazy_itable_init); 257227ee40dfSLukas Czerner EXT4_INFO_ATTR(batched_discard); 2573857ac889SLukas Czerner 2574857ac889SLukas Czerner static struct attribute *ext4_feat_attrs[] = { 2575857ac889SLukas Czerner ATTR_LIST(lazy_itable_init), 257627ee40dfSLukas Czerner ATTR_LIST(batched_discard), 2577857ac889SLukas Czerner NULL, 2578857ac889SLukas Czerner }; 2579857ac889SLukas Czerner 25803197ebdbSTheodore Ts'o static ssize_t ext4_attr_show(struct kobject *kobj, 25813197ebdbSTheodore Ts'o struct attribute *attr, char *buf) 25823197ebdbSTheodore Ts'o { 25833197ebdbSTheodore Ts'o struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 25843197ebdbSTheodore Ts'o s_kobj); 25853197ebdbSTheodore Ts'o struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); 25863197ebdbSTheodore Ts'o 25873197ebdbSTheodore Ts'o return a->show ? a->show(a, sbi, buf) : 0; 25883197ebdbSTheodore Ts'o } 25893197ebdbSTheodore Ts'o 25903197ebdbSTheodore Ts'o static ssize_t ext4_attr_store(struct kobject *kobj, 25913197ebdbSTheodore Ts'o struct attribute *attr, 25923197ebdbSTheodore Ts'o const char *buf, size_t len) 25933197ebdbSTheodore Ts'o { 25943197ebdbSTheodore Ts'o struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 25953197ebdbSTheodore Ts'o s_kobj); 25963197ebdbSTheodore Ts'o struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); 25973197ebdbSTheodore Ts'o 25983197ebdbSTheodore Ts'o return a->store ? a->store(a, sbi, buf, len) : 0; 25993197ebdbSTheodore Ts'o } 26003197ebdbSTheodore Ts'o 26013197ebdbSTheodore Ts'o static void ext4_sb_release(struct kobject *kobj) 26023197ebdbSTheodore Ts'o { 26033197ebdbSTheodore Ts'o struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 26043197ebdbSTheodore Ts'o s_kobj); 26053197ebdbSTheodore Ts'o complete(&sbi->s_kobj_unregister); 26063197ebdbSTheodore Ts'o } 26073197ebdbSTheodore Ts'o 260852cf25d0SEmese Revfy static const struct sysfs_ops ext4_attr_ops = { 26093197ebdbSTheodore Ts'o .show = ext4_attr_show, 26103197ebdbSTheodore Ts'o .store = ext4_attr_store, 26113197ebdbSTheodore Ts'o }; 26123197ebdbSTheodore Ts'o 26133197ebdbSTheodore Ts'o static struct kobj_type ext4_ktype = { 26143197ebdbSTheodore Ts'o .default_attrs = ext4_attrs, 26153197ebdbSTheodore Ts'o .sysfs_ops = &ext4_attr_ops, 26163197ebdbSTheodore Ts'o .release = ext4_sb_release, 26173197ebdbSTheodore Ts'o }; 26183197ebdbSTheodore Ts'o 2619857ac889SLukas Czerner static void ext4_feat_release(struct kobject *kobj) 2620857ac889SLukas Czerner { 2621857ac889SLukas Czerner complete(&ext4_feat->f_kobj_unregister); 2622857ac889SLukas Czerner } 2623857ac889SLukas Czerner 2624857ac889SLukas Czerner static struct kobj_type ext4_feat_ktype = { 2625857ac889SLukas Czerner .default_attrs = ext4_feat_attrs, 2626857ac889SLukas Czerner .sysfs_ops = &ext4_attr_ops, 2627857ac889SLukas Czerner .release = ext4_feat_release, 2628857ac889SLukas Czerner }; 2629857ac889SLukas Czerner 2630a13fb1a4SEric Sandeen /* 2631a13fb1a4SEric Sandeen * Check whether this filesystem can be mounted based on 2632a13fb1a4SEric Sandeen * the features present and the RDONLY/RDWR mount requested. 2633a13fb1a4SEric Sandeen * Returns 1 if this filesystem can be mounted as requested, 2634a13fb1a4SEric Sandeen * 0 if it cannot be. 2635a13fb1a4SEric Sandeen */ 2636a13fb1a4SEric Sandeen static int ext4_feature_set_ok(struct super_block *sb, int readonly) 2637a13fb1a4SEric Sandeen { 2638a13fb1a4SEric Sandeen if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) { 2639a13fb1a4SEric Sandeen ext4_msg(sb, KERN_ERR, 2640a13fb1a4SEric Sandeen "Couldn't mount because of " 2641a13fb1a4SEric Sandeen "unsupported optional features (%x)", 2642a13fb1a4SEric Sandeen (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) & 2643a13fb1a4SEric Sandeen ~EXT4_FEATURE_INCOMPAT_SUPP)); 2644a13fb1a4SEric Sandeen return 0; 2645a13fb1a4SEric Sandeen } 2646a13fb1a4SEric Sandeen 2647a13fb1a4SEric Sandeen if (readonly) 2648a13fb1a4SEric Sandeen return 1; 2649a13fb1a4SEric Sandeen 2650a13fb1a4SEric Sandeen /* Check that feature set is OK for a read-write mount */ 2651a13fb1a4SEric Sandeen if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) { 2652a13fb1a4SEric Sandeen ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of " 2653a13fb1a4SEric Sandeen "unsupported optional features (%x)", 2654a13fb1a4SEric Sandeen (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) & 2655a13fb1a4SEric Sandeen ~EXT4_FEATURE_RO_COMPAT_SUPP)); 2656a13fb1a4SEric Sandeen return 0; 2657a13fb1a4SEric Sandeen } 2658a13fb1a4SEric Sandeen /* 2659a13fb1a4SEric Sandeen * Large file size enabled file system can only be mounted 2660a13fb1a4SEric Sandeen * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF 2661a13fb1a4SEric Sandeen */ 2662a13fb1a4SEric Sandeen if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) { 2663a13fb1a4SEric Sandeen if (sizeof(blkcnt_t) < sizeof(u64)) { 2664a13fb1a4SEric Sandeen ext4_msg(sb, KERN_ERR, "Filesystem with huge files " 2665a13fb1a4SEric Sandeen "cannot be mounted RDWR without " 2666a13fb1a4SEric Sandeen "CONFIG_LBDAF"); 2667a13fb1a4SEric Sandeen return 0; 2668a13fb1a4SEric Sandeen } 2669a13fb1a4SEric Sandeen } 2670bab08ab9STheodore Ts'o if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) && 2671bab08ab9STheodore Ts'o !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) { 2672bab08ab9STheodore Ts'o ext4_msg(sb, KERN_ERR, 2673bab08ab9STheodore Ts'o "Can't support bigalloc feature without " 2674bab08ab9STheodore Ts'o "extents feature\n"); 2675bab08ab9STheodore Ts'o return 0; 2676bab08ab9STheodore Ts'o } 2677a13fb1a4SEric Sandeen return 1; 2678a13fb1a4SEric Sandeen } 2679a13fb1a4SEric Sandeen 268066e61a9eSTheodore Ts'o /* 268166e61a9eSTheodore Ts'o * This function is called once a day if we have errors logged 268266e61a9eSTheodore Ts'o * on the file system 268366e61a9eSTheodore Ts'o */ 268466e61a9eSTheodore Ts'o static void print_daily_error_info(unsigned long arg) 268566e61a9eSTheodore Ts'o { 268666e61a9eSTheodore Ts'o struct super_block *sb = (struct super_block *) arg; 268766e61a9eSTheodore Ts'o struct ext4_sb_info *sbi; 268866e61a9eSTheodore Ts'o struct ext4_super_block *es; 268966e61a9eSTheodore Ts'o 269066e61a9eSTheodore Ts'o sbi = EXT4_SB(sb); 269166e61a9eSTheodore Ts'o es = sbi->s_es; 269266e61a9eSTheodore Ts'o 269366e61a9eSTheodore Ts'o if (es->s_error_count) 269466e61a9eSTheodore Ts'o ext4_msg(sb, KERN_NOTICE, "error count: %u", 269566e61a9eSTheodore Ts'o le32_to_cpu(es->s_error_count)); 269666e61a9eSTheodore Ts'o if (es->s_first_error_time) { 269766e61a9eSTheodore Ts'o printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d", 269866e61a9eSTheodore Ts'o sb->s_id, le32_to_cpu(es->s_first_error_time), 269966e61a9eSTheodore Ts'o (int) sizeof(es->s_first_error_func), 270066e61a9eSTheodore Ts'o es->s_first_error_func, 270166e61a9eSTheodore Ts'o le32_to_cpu(es->s_first_error_line)); 270266e61a9eSTheodore Ts'o if (es->s_first_error_ino) 270366e61a9eSTheodore Ts'o printk(": inode %u", 270466e61a9eSTheodore Ts'o le32_to_cpu(es->s_first_error_ino)); 270566e61a9eSTheodore Ts'o if (es->s_first_error_block) 270666e61a9eSTheodore Ts'o printk(": block %llu", (unsigned long long) 270766e61a9eSTheodore Ts'o le64_to_cpu(es->s_first_error_block)); 270866e61a9eSTheodore Ts'o printk("\n"); 270966e61a9eSTheodore Ts'o } 271066e61a9eSTheodore Ts'o if (es->s_last_error_time) { 271166e61a9eSTheodore Ts'o printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d", 271266e61a9eSTheodore Ts'o sb->s_id, le32_to_cpu(es->s_last_error_time), 271366e61a9eSTheodore Ts'o (int) sizeof(es->s_last_error_func), 271466e61a9eSTheodore Ts'o es->s_last_error_func, 271566e61a9eSTheodore Ts'o le32_to_cpu(es->s_last_error_line)); 271666e61a9eSTheodore Ts'o if (es->s_last_error_ino) 271766e61a9eSTheodore Ts'o printk(": inode %u", 271866e61a9eSTheodore Ts'o le32_to_cpu(es->s_last_error_ino)); 271966e61a9eSTheodore Ts'o if (es->s_last_error_block) 272066e61a9eSTheodore Ts'o printk(": block %llu", (unsigned long long) 272166e61a9eSTheodore Ts'o le64_to_cpu(es->s_last_error_block)); 272266e61a9eSTheodore Ts'o printk("\n"); 272366e61a9eSTheodore Ts'o } 272466e61a9eSTheodore Ts'o mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */ 272566e61a9eSTheodore Ts'o } 272666e61a9eSTheodore Ts'o 2727bfff6873SLukas Czerner /* Find next suitable group and run ext4_init_inode_table */ 2728bfff6873SLukas Czerner static int ext4_run_li_request(struct ext4_li_request *elr) 2729bfff6873SLukas Czerner { 2730bfff6873SLukas Czerner struct ext4_group_desc *gdp = NULL; 2731bfff6873SLukas Czerner ext4_group_t group, ngroups; 2732bfff6873SLukas Czerner struct super_block *sb; 2733bfff6873SLukas Czerner unsigned long timeout = 0; 2734bfff6873SLukas Czerner int ret = 0; 2735bfff6873SLukas Czerner 2736bfff6873SLukas Czerner sb = elr->lr_super; 2737bfff6873SLukas Czerner ngroups = EXT4_SB(sb)->s_groups_count; 2738bfff6873SLukas Czerner 2739bfff6873SLukas Czerner for (group = elr->lr_next_group; group < ngroups; group++) { 2740bfff6873SLukas Czerner gdp = ext4_get_group_desc(sb, group, NULL); 2741bfff6873SLukas Czerner if (!gdp) { 2742bfff6873SLukas Czerner ret = 1; 2743bfff6873SLukas Czerner break; 2744bfff6873SLukas Czerner } 2745bfff6873SLukas Czerner 2746bfff6873SLukas Czerner if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) 2747bfff6873SLukas Czerner break; 2748bfff6873SLukas Czerner } 2749bfff6873SLukas Czerner 2750bfff6873SLukas Czerner if (group == ngroups) 2751bfff6873SLukas Czerner ret = 1; 2752bfff6873SLukas Czerner 2753bfff6873SLukas Czerner if (!ret) { 2754bfff6873SLukas Czerner timeout = jiffies; 2755bfff6873SLukas Czerner ret = ext4_init_inode_table(sb, group, 2756bfff6873SLukas Czerner elr->lr_timeout ? 0 : 1); 2757bfff6873SLukas Czerner if (elr->lr_timeout == 0) { 275851ce6511SLukas Czerner timeout = (jiffies - timeout) * 275951ce6511SLukas Czerner elr->lr_sbi->s_li_wait_mult; 2760bfff6873SLukas Czerner elr->lr_timeout = timeout; 2761bfff6873SLukas Czerner } 2762bfff6873SLukas Czerner elr->lr_next_sched = jiffies + elr->lr_timeout; 2763bfff6873SLukas Czerner elr->lr_next_group = group + 1; 2764bfff6873SLukas Czerner } 2765bfff6873SLukas Czerner 2766bfff6873SLukas Czerner return ret; 2767bfff6873SLukas Czerner } 2768bfff6873SLukas Czerner 2769bfff6873SLukas Czerner /* 2770bfff6873SLukas Czerner * Remove lr_request from the list_request and free the 27714ed5c033SLukas Czerner * request structure. Should be called with li_list_mtx held 2772bfff6873SLukas Czerner */ 2773bfff6873SLukas Czerner static void ext4_remove_li_request(struct ext4_li_request *elr) 2774bfff6873SLukas Czerner { 2775bfff6873SLukas Czerner struct ext4_sb_info *sbi; 2776bfff6873SLukas Czerner 2777bfff6873SLukas Czerner if (!elr) 2778bfff6873SLukas Czerner return; 2779bfff6873SLukas Czerner 2780bfff6873SLukas Czerner sbi = elr->lr_sbi; 2781bfff6873SLukas Czerner 2782bfff6873SLukas Czerner list_del(&elr->lr_request); 2783bfff6873SLukas Czerner sbi->s_li_request = NULL; 2784bfff6873SLukas Czerner kfree(elr); 2785bfff6873SLukas Czerner } 2786bfff6873SLukas Czerner 2787bfff6873SLukas Czerner static void ext4_unregister_li_request(struct super_block *sb) 2788bfff6873SLukas Czerner { 27891bb933fbSLukas Czerner mutex_lock(&ext4_li_mtx); 27901bb933fbSLukas Czerner if (!ext4_li_info) { 27911bb933fbSLukas Czerner mutex_unlock(&ext4_li_mtx); 2792bfff6873SLukas Czerner return; 27931bb933fbSLukas Czerner } 2794bfff6873SLukas Czerner 2795bfff6873SLukas Czerner mutex_lock(&ext4_li_info->li_list_mtx); 27961bb933fbSLukas Czerner ext4_remove_li_request(EXT4_SB(sb)->s_li_request); 2797bfff6873SLukas Czerner mutex_unlock(&ext4_li_info->li_list_mtx); 27981bb933fbSLukas Czerner mutex_unlock(&ext4_li_mtx); 2799bfff6873SLukas Czerner } 2800bfff6873SLukas Czerner 28018f1f7453SEric Sandeen static struct task_struct *ext4_lazyinit_task; 28028f1f7453SEric Sandeen 2803bfff6873SLukas Czerner /* 2804bfff6873SLukas Czerner * This is the function where ext4lazyinit thread lives. It walks 2805bfff6873SLukas Czerner * through the request list searching for next scheduled filesystem. 2806bfff6873SLukas Czerner * When such a fs is found, run the lazy initialization request 2807bfff6873SLukas Czerner * (ext4_rn_li_request) and keep track of the time spend in this 2808bfff6873SLukas Czerner * function. Based on that time we compute next schedule time of 2809bfff6873SLukas Czerner * the request. When walking through the list is complete, compute 2810bfff6873SLukas Czerner * next waking time and put itself into sleep. 2811bfff6873SLukas Czerner */ 2812bfff6873SLukas Czerner static int ext4_lazyinit_thread(void *arg) 2813bfff6873SLukas Czerner { 2814bfff6873SLukas Czerner struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg; 2815bfff6873SLukas Czerner struct list_head *pos, *n; 2816bfff6873SLukas Czerner struct ext4_li_request *elr; 28174ed5c033SLukas Czerner unsigned long next_wakeup, cur; 2818bfff6873SLukas Czerner 2819bfff6873SLukas Czerner BUG_ON(NULL == eli); 2820bfff6873SLukas Czerner 2821bfff6873SLukas Czerner cont_thread: 2822bfff6873SLukas Czerner while (true) { 2823bfff6873SLukas Czerner next_wakeup = MAX_JIFFY_OFFSET; 2824bfff6873SLukas Czerner 2825bfff6873SLukas Czerner mutex_lock(&eli->li_list_mtx); 2826bfff6873SLukas Czerner if (list_empty(&eli->li_request_list)) { 2827bfff6873SLukas Czerner mutex_unlock(&eli->li_list_mtx); 2828bfff6873SLukas Czerner goto exit_thread; 2829bfff6873SLukas Czerner } 2830bfff6873SLukas Czerner 2831bfff6873SLukas Czerner list_for_each_safe(pos, n, &eli->li_request_list) { 2832bfff6873SLukas Czerner elr = list_entry(pos, struct ext4_li_request, 2833bfff6873SLukas Czerner lr_request); 2834bfff6873SLukas Czerner 2835b2c78cd0STheodore Ts'o if (time_after_eq(jiffies, elr->lr_next_sched)) { 2836b2c78cd0STheodore Ts'o if (ext4_run_li_request(elr) != 0) { 2837b2c78cd0STheodore Ts'o /* error, remove the lazy_init job */ 2838bfff6873SLukas Czerner ext4_remove_li_request(elr); 2839bfff6873SLukas Czerner continue; 2840bfff6873SLukas Czerner } 2841b2c78cd0STheodore Ts'o } 2842bfff6873SLukas Czerner 2843bfff6873SLukas Czerner if (time_before(elr->lr_next_sched, next_wakeup)) 2844bfff6873SLukas Czerner next_wakeup = elr->lr_next_sched; 2845bfff6873SLukas Czerner } 2846bfff6873SLukas Czerner mutex_unlock(&eli->li_list_mtx); 2847bfff6873SLukas Czerner 2848a0acae0eSTejun Heo try_to_freeze(); 2849bfff6873SLukas Czerner 28504ed5c033SLukas Czerner cur = jiffies; 28514ed5c033SLukas Czerner if ((time_after_eq(cur, next_wakeup)) || 2852f4245bd4SLukas Czerner (MAX_JIFFY_OFFSET == next_wakeup)) { 2853bfff6873SLukas Czerner cond_resched(); 2854bfff6873SLukas Czerner continue; 2855bfff6873SLukas Czerner } 2856bfff6873SLukas Czerner 28574ed5c033SLukas Czerner schedule_timeout_interruptible(next_wakeup - cur); 28584ed5c033SLukas Czerner 28598f1f7453SEric Sandeen if (kthread_should_stop()) { 28608f1f7453SEric Sandeen ext4_clear_request_list(); 28618f1f7453SEric Sandeen goto exit_thread; 28628f1f7453SEric Sandeen } 2863bfff6873SLukas Czerner } 2864bfff6873SLukas Czerner 2865bfff6873SLukas Czerner exit_thread: 2866bfff6873SLukas Czerner /* 2867bfff6873SLukas Czerner * It looks like the request list is empty, but we need 2868bfff6873SLukas Czerner * to check it under the li_list_mtx lock, to prevent any 2869bfff6873SLukas Czerner * additions into it, and of course we should lock ext4_li_mtx 2870bfff6873SLukas Czerner * to atomically free the list and ext4_li_info, because at 2871bfff6873SLukas Czerner * this point another ext4 filesystem could be registering 2872bfff6873SLukas Czerner * new one. 2873bfff6873SLukas Czerner */ 2874bfff6873SLukas Czerner mutex_lock(&ext4_li_mtx); 2875bfff6873SLukas Czerner mutex_lock(&eli->li_list_mtx); 2876bfff6873SLukas Czerner if (!list_empty(&eli->li_request_list)) { 2877bfff6873SLukas Czerner mutex_unlock(&eli->li_list_mtx); 2878bfff6873SLukas Czerner mutex_unlock(&ext4_li_mtx); 2879bfff6873SLukas Czerner goto cont_thread; 2880bfff6873SLukas Czerner } 2881bfff6873SLukas Czerner mutex_unlock(&eli->li_list_mtx); 2882bfff6873SLukas Czerner kfree(ext4_li_info); 2883bfff6873SLukas Czerner ext4_li_info = NULL; 2884bfff6873SLukas Czerner mutex_unlock(&ext4_li_mtx); 2885bfff6873SLukas Czerner 2886bfff6873SLukas Czerner return 0; 2887bfff6873SLukas Czerner } 2888bfff6873SLukas Czerner 2889bfff6873SLukas Czerner static void ext4_clear_request_list(void) 2890bfff6873SLukas Czerner { 2891bfff6873SLukas Czerner struct list_head *pos, *n; 2892bfff6873SLukas Czerner struct ext4_li_request *elr; 2893bfff6873SLukas Czerner 2894bfff6873SLukas Czerner mutex_lock(&ext4_li_info->li_list_mtx); 2895bfff6873SLukas Czerner list_for_each_safe(pos, n, &ext4_li_info->li_request_list) { 2896bfff6873SLukas Czerner elr = list_entry(pos, struct ext4_li_request, 2897bfff6873SLukas Czerner lr_request); 2898bfff6873SLukas Czerner ext4_remove_li_request(elr); 2899bfff6873SLukas Czerner } 2900bfff6873SLukas Czerner mutex_unlock(&ext4_li_info->li_list_mtx); 2901bfff6873SLukas Czerner } 2902bfff6873SLukas Czerner 2903bfff6873SLukas Czerner static int ext4_run_lazyinit_thread(void) 2904bfff6873SLukas Czerner { 29058f1f7453SEric Sandeen ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread, 29068f1f7453SEric Sandeen ext4_li_info, "ext4lazyinit"); 29078f1f7453SEric Sandeen if (IS_ERR(ext4_lazyinit_task)) { 29088f1f7453SEric Sandeen int err = PTR_ERR(ext4_lazyinit_task); 2909bfff6873SLukas Czerner ext4_clear_request_list(); 2910bfff6873SLukas Czerner kfree(ext4_li_info); 2911bfff6873SLukas Czerner ext4_li_info = NULL; 2912bfff6873SLukas Czerner printk(KERN_CRIT "EXT4: error %d creating inode table " 2913bfff6873SLukas Czerner "initialization thread\n", 2914bfff6873SLukas Czerner err); 2915bfff6873SLukas Czerner return err; 2916bfff6873SLukas Czerner } 2917bfff6873SLukas Czerner ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING; 2918bfff6873SLukas Czerner return 0; 2919bfff6873SLukas Czerner } 2920bfff6873SLukas Czerner 2921bfff6873SLukas Czerner /* 2922bfff6873SLukas Czerner * Check whether it make sense to run itable init. thread or not. 2923bfff6873SLukas Czerner * If there is at least one uninitialized inode table, return 2924bfff6873SLukas Czerner * corresponding group number, else the loop goes through all 2925bfff6873SLukas Czerner * groups and return total number of groups. 2926bfff6873SLukas Czerner */ 2927bfff6873SLukas Czerner static ext4_group_t ext4_has_uninit_itable(struct super_block *sb) 2928bfff6873SLukas Czerner { 2929bfff6873SLukas Czerner ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count; 2930bfff6873SLukas Czerner struct ext4_group_desc *gdp = NULL; 2931bfff6873SLukas Czerner 2932bfff6873SLukas Czerner for (group = 0; group < ngroups; group++) { 2933bfff6873SLukas Czerner gdp = ext4_get_group_desc(sb, group, NULL); 2934bfff6873SLukas Czerner if (!gdp) 2935bfff6873SLukas Czerner continue; 2936bfff6873SLukas Czerner 2937bfff6873SLukas Czerner if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) 2938bfff6873SLukas Czerner break; 2939bfff6873SLukas Czerner } 2940bfff6873SLukas Czerner 2941bfff6873SLukas Czerner return group; 2942bfff6873SLukas Czerner } 2943bfff6873SLukas Czerner 2944bfff6873SLukas Czerner static int ext4_li_info_new(void) 2945bfff6873SLukas Czerner { 2946bfff6873SLukas Czerner struct ext4_lazy_init *eli = NULL; 2947bfff6873SLukas Czerner 2948bfff6873SLukas Czerner eli = kzalloc(sizeof(*eli), GFP_KERNEL); 2949bfff6873SLukas Czerner if (!eli) 2950bfff6873SLukas Czerner return -ENOMEM; 2951bfff6873SLukas Czerner 2952bfff6873SLukas Czerner INIT_LIST_HEAD(&eli->li_request_list); 2953bfff6873SLukas Czerner mutex_init(&eli->li_list_mtx); 2954bfff6873SLukas Czerner 2955bfff6873SLukas Czerner eli->li_state |= EXT4_LAZYINIT_QUIT; 2956bfff6873SLukas Czerner 2957bfff6873SLukas Czerner ext4_li_info = eli; 2958bfff6873SLukas Czerner 2959bfff6873SLukas Czerner return 0; 2960bfff6873SLukas Czerner } 2961bfff6873SLukas Czerner 2962bfff6873SLukas Czerner static struct ext4_li_request *ext4_li_request_new(struct super_block *sb, 2963bfff6873SLukas Czerner ext4_group_t start) 2964bfff6873SLukas Czerner { 2965bfff6873SLukas Czerner struct ext4_sb_info *sbi = EXT4_SB(sb); 2966bfff6873SLukas Czerner struct ext4_li_request *elr; 2967bfff6873SLukas Czerner unsigned long rnd; 2968bfff6873SLukas Czerner 2969bfff6873SLukas Czerner elr = kzalloc(sizeof(*elr), GFP_KERNEL); 2970bfff6873SLukas Czerner if (!elr) 2971bfff6873SLukas Czerner return NULL; 2972bfff6873SLukas Czerner 2973bfff6873SLukas Czerner elr->lr_super = sb; 2974bfff6873SLukas Czerner elr->lr_sbi = sbi; 2975bfff6873SLukas Czerner elr->lr_next_group = start; 2976bfff6873SLukas Czerner 2977bfff6873SLukas Czerner /* 2978bfff6873SLukas Czerner * Randomize first schedule time of the request to 2979bfff6873SLukas Czerner * spread the inode table initialization requests 2980bfff6873SLukas Czerner * better. 2981bfff6873SLukas Czerner */ 2982bfff6873SLukas Czerner get_random_bytes(&rnd, sizeof(rnd)); 2983bfff6873SLukas Czerner elr->lr_next_sched = jiffies + (unsigned long)rnd % 2984bfff6873SLukas Czerner (EXT4_DEF_LI_MAX_START_DELAY * HZ); 2985bfff6873SLukas Czerner 2986bfff6873SLukas Czerner return elr; 2987bfff6873SLukas Czerner } 2988bfff6873SLukas Czerner 2989bfff6873SLukas Czerner static int ext4_register_li_request(struct super_block *sb, 2990bfff6873SLukas Czerner ext4_group_t first_not_zeroed) 2991bfff6873SLukas Czerner { 2992bfff6873SLukas Czerner struct ext4_sb_info *sbi = EXT4_SB(sb); 2993bfff6873SLukas Czerner struct ext4_li_request *elr; 2994bfff6873SLukas Czerner ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; 29956c5a6cb9SAndrew Morton int ret = 0; 2996bfff6873SLukas Czerner 299751ce6511SLukas Czerner if (sbi->s_li_request != NULL) { 299851ce6511SLukas Czerner /* 299951ce6511SLukas Czerner * Reset timeout so it can be computed again, because 300051ce6511SLukas Czerner * s_li_wait_mult might have changed. 300151ce6511SLukas Czerner */ 300251ce6511SLukas Czerner sbi->s_li_request->lr_timeout = 0; 3003beed5ecbSNicolas Kaiser return 0; 300451ce6511SLukas Czerner } 3005bfff6873SLukas Czerner 3006bfff6873SLukas Czerner if (first_not_zeroed == ngroups || 3007bfff6873SLukas Czerner (sb->s_flags & MS_RDONLY) || 300855ff3840STao Ma !test_opt(sb, INIT_INODE_TABLE)) 3009beed5ecbSNicolas Kaiser return 0; 3010bfff6873SLukas Czerner 3011bfff6873SLukas Czerner elr = ext4_li_request_new(sb, first_not_zeroed); 3012beed5ecbSNicolas Kaiser if (!elr) 3013beed5ecbSNicolas Kaiser return -ENOMEM; 3014bfff6873SLukas Czerner 3015bfff6873SLukas Czerner mutex_lock(&ext4_li_mtx); 3016bfff6873SLukas Czerner 3017bfff6873SLukas Czerner if (NULL == ext4_li_info) { 3018bfff6873SLukas Czerner ret = ext4_li_info_new(); 3019bfff6873SLukas Czerner if (ret) 3020bfff6873SLukas Czerner goto out; 3021bfff6873SLukas Czerner } 3022bfff6873SLukas Czerner 3023bfff6873SLukas Czerner mutex_lock(&ext4_li_info->li_list_mtx); 3024bfff6873SLukas Czerner list_add(&elr->lr_request, &ext4_li_info->li_request_list); 3025bfff6873SLukas Czerner mutex_unlock(&ext4_li_info->li_list_mtx); 3026bfff6873SLukas Czerner 3027bfff6873SLukas Czerner sbi->s_li_request = elr; 302846e4690bSTao Ma /* 302946e4690bSTao Ma * set elr to NULL here since it has been inserted to 303046e4690bSTao Ma * the request_list and the removal and free of it is 303146e4690bSTao Ma * handled by ext4_clear_request_list from now on. 303246e4690bSTao Ma */ 303346e4690bSTao Ma elr = NULL; 3034bfff6873SLukas Czerner 3035bfff6873SLukas Czerner if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) { 3036bfff6873SLukas Czerner ret = ext4_run_lazyinit_thread(); 3037bfff6873SLukas Czerner if (ret) 3038bfff6873SLukas Czerner goto out; 3039bfff6873SLukas Czerner } 3040bfff6873SLukas Czerner out: 3041bfff6873SLukas Czerner mutex_unlock(&ext4_li_mtx); 3042beed5ecbSNicolas Kaiser if (ret) 3043bfff6873SLukas Czerner kfree(elr); 3044bfff6873SLukas Czerner return ret; 3045bfff6873SLukas Czerner } 3046bfff6873SLukas Czerner 3047bfff6873SLukas Czerner /* 3048bfff6873SLukas Czerner * We do not need to lock anything since this is called on 3049bfff6873SLukas Czerner * module unload. 3050bfff6873SLukas Czerner */ 3051bfff6873SLukas Czerner static void ext4_destroy_lazyinit_thread(void) 3052bfff6873SLukas Czerner { 3053bfff6873SLukas Czerner /* 3054bfff6873SLukas Czerner * If thread exited earlier 3055bfff6873SLukas Czerner * there's nothing to be done. 3056bfff6873SLukas Czerner */ 30578f1f7453SEric Sandeen if (!ext4_li_info || !ext4_lazyinit_task) 3058bfff6873SLukas Czerner return; 3059bfff6873SLukas Czerner 30608f1f7453SEric Sandeen kthread_stop(ext4_lazyinit_task); 3061bfff6873SLukas Czerner } 3062bfff6873SLukas Czerner 3063617ba13bSMingming Cao static int ext4_fill_super(struct super_block *sb, void *data, int silent) 3064ac27a0ecSDave Kleikamp { 3065d4c402d9SCurt Wohlgemuth char *orig_data = kstrdup(data, GFP_KERNEL); 3066ac27a0ecSDave Kleikamp struct buffer_head *bh; 3067617ba13bSMingming Cao struct ext4_super_block *es = NULL; 3068617ba13bSMingming Cao struct ext4_sb_info *sbi; 3069617ba13bSMingming Cao ext4_fsblk_t block; 3070617ba13bSMingming Cao ext4_fsblk_t sb_block = get_sb_block(&data); 307170bbb3e0SAndrew Morton ext4_fsblk_t logical_sb_block; 3072ac27a0ecSDave Kleikamp unsigned long offset = 0; 3073ac27a0ecSDave Kleikamp unsigned long journal_devnum = 0; 3074ac27a0ecSDave Kleikamp unsigned long def_mount_opts; 3075ac27a0ecSDave Kleikamp struct inode *root; 30769f6200bbSTheodore Ts'o char *cp; 30770390131bSFrank Mayhar const char *descr; 3078dcc7dae3SCyrill Gorcunov int ret = -ENOMEM; 3079281b5995STheodore Ts'o int blocksize, clustersize; 30804ec11028STheodore Ts'o unsigned int db_count; 30814ec11028STheodore Ts'o unsigned int i; 3082281b5995STheodore Ts'o int needs_recovery, has_huge_files, has_bigalloc; 3083bd81d8eeSLaurent Vivier __u64 blocks_count; 3084833f4077SPeter Zijlstra int err; 3085b3881f74STheodore Ts'o unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; 3086bfff6873SLukas Czerner ext4_group_t first_not_zeroed; 3087ac27a0ecSDave Kleikamp 3088ac27a0ecSDave Kleikamp sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 3089ac27a0ecSDave Kleikamp if (!sbi) 3090dcc7dae3SCyrill Gorcunov goto out_free_orig; 3091705895b6SPekka Enberg 3092705895b6SPekka Enberg sbi->s_blockgroup_lock = 3093705895b6SPekka Enberg kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); 3094705895b6SPekka Enberg if (!sbi->s_blockgroup_lock) { 3095705895b6SPekka Enberg kfree(sbi); 3096dcc7dae3SCyrill Gorcunov goto out_free_orig; 3097705895b6SPekka Enberg } 3098ac27a0ecSDave Kleikamp sb->s_fs_info = sbi; 3099ac27a0ecSDave Kleikamp sbi->s_mount_opt = 0; 3100617ba13bSMingming Cao sbi->s_resuid = EXT4_DEF_RESUID; 3101617ba13bSMingming Cao sbi->s_resgid = EXT4_DEF_RESGID; 3102240799cdSTheodore Ts'o sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS; 3103d9c9bef1SMiklos Szeredi sbi->s_sb_block = sb_block; 3104f613dfcbSTheodore Ts'o if (sb->s_bdev->bd_part) 3105f613dfcbSTheodore Ts'o sbi->s_sectors_written_start = 3106f613dfcbSTheodore Ts'o part_stat_read(sb->s_bdev->bd_part, sectors[1]); 3107ac27a0ecSDave Kleikamp 31089f6200bbSTheodore Ts'o /* Cleanup superblock name */ 31099f6200bbSTheodore Ts'o for (cp = sb->s_id; (cp = strchr(cp, '/'));) 31109f6200bbSTheodore Ts'o *cp = '!'; 31119f6200bbSTheodore Ts'o 3112dcc7dae3SCyrill Gorcunov ret = -EINVAL; 3113617ba13bSMingming Cao blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); 3114ac27a0ecSDave Kleikamp if (!blocksize) { 3115b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "unable to set blocksize"); 3116ac27a0ecSDave Kleikamp goto out_fail; 3117ac27a0ecSDave Kleikamp } 3118ac27a0ecSDave Kleikamp 3119ac27a0ecSDave Kleikamp /* 3120617ba13bSMingming Cao * The ext4 superblock will not be buffer aligned for other than 1kB 3121ac27a0ecSDave Kleikamp * block sizes. We need to calculate the offset from buffer start. 3122ac27a0ecSDave Kleikamp */ 3123617ba13bSMingming Cao if (blocksize != EXT4_MIN_BLOCK_SIZE) { 312470bbb3e0SAndrew Morton logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 312570bbb3e0SAndrew Morton offset = do_div(logical_sb_block, blocksize); 3126ac27a0ecSDave Kleikamp } else { 312770bbb3e0SAndrew Morton logical_sb_block = sb_block; 3128ac27a0ecSDave Kleikamp } 3129ac27a0ecSDave Kleikamp 313070bbb3e0SAndrew Morton if (!(bh = sb_bread(sb, logical_sb_block))) { 3131b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "unable to read superblock"); 3132ac27a0ecSDave Kleikamp goto out_fail; 3133ac27a0ecSDave Kleikamp } 3134ac27a0ecSDave Kleikamp /* 3135ac27a0ecSDave Kleikamp * Note: s_es must be initialized as soon as possible because 3136617ba13bSMingming Cao * some ext4 macro-instructions depend on its value 3137ac27a0ecSDave Kleikamp */ 3138617ba13bSMingming Cao es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 3139ac27a0ecSDave Kleikamp sbi->s_es = es; 3140ac27a0ecSDave Kleikamp sb->s_magic = le16_to_cpu(es->s_magic); 3141617ba13bSMingming Cao if (sb->s_magic != EXT4_SUPER_MAGIC) 3142617ba13bSMingming Cao goto cantfind_ext4; 3143afc32f7eSTheodore Ts'o sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written); 3144ac27a0ecSDave Kleikamp 3145ac27a0ecSDave Kleikamp /* Set defaults before we parse the mount options */ 3146ac27a0ecSDave Kleikamp def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 3147fd8c37ecSTheodore Ts'o set_opt(sb, INIT_INODE_TABLE); 3148617ba13bSMingming Cao if (def_mount_opts & EXT4_DEFM_DEBUG) 3149fd8c37ecSTheodore Ts'o set_opt(sb, DEBUG); 315087f26807STheodore Ts'o if (def_mount_opts & EXT4_DEFM_BSDGROUPS) 3151fd8c37ecSTheodore Ts'o set_opt(sb, GRPID); 3152617ba13bSMingming Cao if (def_mount_opts & EXT4_DEFM_UID16) 3153fd8c37ecSTheodore Ts'o set_opt(sb, NO_UID32); 3154ea663336SEric Sandeen /* xattr user namespace & acls are now defaulted on */ 315503010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_XATTR 3156fd8c37ecSTheodore Ts'o set_opt(sb, XATTR_USER); 31572e7842b8SHugh Dickins #endif 315803010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 3159fd8c37ecSTheodore Ts'o set_opt(sb, POSIX_ACL); 31602e7842b8SHugh Dickins #endif 31616fd7a467STheodore Ts'o set_opt(sb, MBLK_IO_SUBMIT); 3162617ba13bSMingming Cao if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) 3163fd8c37ecSTheodore Ts'o set_opt(sb, JOURNAL_DATA); 3164617ba13bSMingming Cao else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) 3165fd8c37ecSTheodore Ts'o set_opt(sb, ORDERED_DATA); 3166617ba13bSMingming Cao else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) 3167fd8c37ecSTheodore Ts'o set_opt(sb, WRITEBACK_DATA); 3168ac27a0ecSDave Kleikamp 3169617ba13bSMingming Cao if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) 3170fd8c37ecSTheodore Ts'o set_opt(sb, ERRORS_PANIC); 3171bb4f397aSAneesh Kumar K.V else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE) 3172fd8c37ecSTheodore Ts'o set_opt(sb, ERRORS_CONT); 3173bb4f397aSAneesh Kumar K.V else 3174fd8c37ecSTheodore Ts'o set_opt(sb, ERRORS_RO); 31758b67f04aSTheodore Ts'o if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY) 3176fd8c37ecSTheodore Ts'o set_opt(sb, BLOCK_VALIDITY); 31778b67f04aSTheodore Ts'o if (def_mount_opts & EXT4_DEFM_DISCARD) 3178fd8c37ecSTheodore Ts'o set_opt(sb, DISCARD); 3179ac27a0ecSDave Kleikamp 3180ac27a0ecSDave Kleikamp sbi->s_resuid = le16_to_cpu(es->s_def_resuid); 3181ac27a0ecSDave Kleikamp sbi->s_resgid = le16_to_cpu(es->s_def_resgid); 318230773840STheodore Ts'o sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ; 318330773840STheodore Ts'o sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME; 318430773840STheodore Ts'o sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME; 3185ac27a0ecSDave Kleikamp 31868b67f04aSTheodore Ts'o if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0) 3187fd8c37ecSTheodore Ts'o set_opt(sb, BARRIER); 3188ac27a0ecSDave Kleikamp 31891e2462f9SMingming Cao /* 3190dd919b98SAneesh Kumar K.V * enable delayed allocation by default 3191dd919b98SAneesh Kumar K.V * Use -o nodelalloc to turn it off 3192dd919b98SAneesh Kumar K.V */ 31938b67f04aSTheodore Ts'o if (!IS_EXT3_SB(sb) && 31948b67f04aSTheodore Ts'o ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0)) 3195fd8c37ecSTheodore Ts'o set_opt(sb, DELALLOC); 3196dd919b98SAneesh Kumar K.V 319751ce6511SLukas Czerner /* 319851ce6511SLukas Czerner * set default s_li_wait_mult for lazyinit, for the case there is 319951ce6511SLukas Czerner * no mount option specified. 320051ce6511SLukas Czerner */ 320151ce6511SLukas Czerner sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT; 320251ce6511SLukas Czerner 32038b67f04aSTheodore Ts'o if (!parse_options((char *) sbi->s_es->s_mount_opts, sb, 3204661aa520SEric Sandeen &journal_devnum, &journal_ioprio, 0)) { 32058b67f04aSTheodore Ts'o ext4_msg(sb, KERN_WARNING, 32068b67f04aSTheodore Ts'o "failed to parse options in superblock: %s", 32078b67f04aSTheodore Ts'o sbi->s_es->s_mount_opts); 32088b67f04aSTheodore Ts'o } 3209b3881f74STheodore Ts'o if (!parse_options((char *) data, sb, &journal_devnum, 3210661aa520SEric Sandeen &journal_ioprio, 0)) 3211ac27a0ecSDave Kleikamp goto failed_mount; 3212ac27a0ecSDave Kleikamp 321356889787STheodore Ts'o if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { 321456889787STheodore Ts'o printk_once(KERN_WARNING "EXT4-fs: Warning: mounting " 321556889787STheodore Ts'o "with data=journal disables delayed " 321656889787STheodore Ts'o "allocation and O_DIRECT support!\n"); 321756889787STheodore Ts'o if (test_opt2(sb, EXPLICIT_DELALLOC)) { 321856889787STheodore Ts'o ext4_msg(sb, KERN_ERR, "can't mount with " 321956889787STheodore Ts'o "both data=journal and delalloc"); 322056889787STheodore Ts'o goto failed_mount; 322156889787STheodore Ts'o } 322256889787STheodore Ts'o if (test_opt(sb, DIOREAD_NOLOCK)) { 322356889787STheodore Ts'o ext4_msg(sb, KERN_ERR, "can't mount with " 322456889787STheodore Ts'o "both data=journal and delalloc"); 322556889787STheodore Ts'o goto failed_mount; 322656889787STheodore Ts'o } 322756889787STheodore Ts'o if (test_opt(sb, DELALLOC)) 322856889787STheodore Ts'o clear_opt(sb, DELALLOC); 322956889787STheodore Ts'o } 323056889787STheodore Ts'o 323156889787STheodore Ts'o blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); 323256889787STheodore Ts'o if (test_opt(sb, DIOREAD_NOLOCK)) { 323356889787STheodore Ts'o if (blocksize < PAGE_SIZE) { 323456889787STheodore Ts'o ext4_msg(sb, KERN_ERR, "can't mount with " 323556889787STheodore Ts'o "dioread_nolock if block size != PAGE_SIZE"); 323656889787STheodore Ts'o goto failed_mount; 323756889787STheodore Ts'o } 323856889787STheodore Ts'o } 323956889787STheodore Ts'o 3240ac27a0ecSDave Kleikamp sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 3241482a7425SDmitry Monakhov (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); 3242ac27a0ecSDave Kleikamp 3243617ba13bSMingming Cao if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && 3244617ba13bSMingming Cao (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || 3245617ba13bSMingming Cao EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 3246617ba13bSMingming Cao EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) 3247b31e1552SEric Sandeen ext4_msg(sb, KERN_WARNING, 3248b31e1552SEric Sandeen "feature flags set on rev 0 fs, " 3249b31e1552SEric Sandeen "running e2fsck is recommended"); 3250469108ffSTheodore Tso 32512035e776STheodore Ts'o if (IS_EXT2_SB(sb)) { 32522035e776STheodore Ts'o if (ext2_feature_set_ok(sb)) 32532035e776STheodore Ts'o ext4_msg(sb, KERN_INFO, "mounting ext2 file system " 32542035e776STheodore Ts'o "using the ext4 subsystem"); 32552035e776STheodore Ts'o else { 32562035e776STheodore Ts'o ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due " 32572035e776STheodore Ts'o "to feature incompatibilities"); 32582035e776STheodore Ts'o goto failed_mount; 32592035e776STheodore Ts'o } 32602035e776STheodore Ts'o } 32612035e776STheodore Ts'o 32622035e776STheodore Ts'o if (IS_EXT3_SB(sb)) { 32632035e776STheodore Ts'o if (ext3_feature_set_ok(sb)) 32642035e776STheodore Ts'o ext4_msg(sb, KERN_INFO, "mounting ext3 file system " 32652035e776STheodore Ts'o "using the ext4 subsystem"); 32662035e776STheodore Ts'o else { 32672035e776STheodore Ts'o ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due " 32682035e776STheodore Ts'o "to feature incompatibilities"); 32692035e776STheodore Ts'o goto failed_mount; 32702035e776STheodore Ts'o } 32712035e776STheodore Ts'o } 32722035e776STheodore Ts'o 3273469108ffSTheodore Tso /* 3274ac27a0ecSDave Kleikamp * Check feature flags regardless of the revision level, since we 3275ac27a0ecSDave Kleikamp * previously didn't change the revision level when setting the flags, 3276ac27a0ecSDave Kleikamp * so there is a chance incompat flags are set on a rev 0 filesystem. 3277ac27a0ecSDave Kleikamp */ 3278a13fb1a4SEric Sandeen if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY))) 3279ac27a0ecSDave Kleikamp goto failed_mount; 3280a13fb1a4SEric Sandeen 3281617ba13bSMingming Cao if (blocksize < EXT4_MIN_BLOCK_SIZE || 3282617ba13bSMingming Cao blocksize > EXT4_MAX_BLOCK_SIZE) { 3283b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, 3284b31e1552SEric Sandeen "Unsupported filesystem blocksize %d", blocksize); 3285ac27a0ecSDave Kleikamp goto failed_mount; 3286ac27a0ecSDave Kleikamp } 3287ac27a0ecSDave Kleikamp 3288ac27a0ecSDave Kleikamp if (sb->s_blocksize != blocksize) { 3289ce40733cSAneesh Kumar K.V /* Validate the filesystem blocksize */ 3290ce40733cSAneesh Kumar K.V if (!sb_set_blocksize(sb, blocksize)) { 3291b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "bad block size %d", 3292ce40733cSAneesh Kumar K.V blocksize); 3293ac27a0ecSDave Kleikamp goto failed_mount; 3294ac27a0ecSDave Kleikamp } 3295ac27a0ecSDave Kleikamp 3296ac27a0ecSDave Kleikamp brelse(bh); 329770bbb3e0SAndrew Morton logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 329870bbb3e0SAndrew Morton offset = do_div(logical_sb_block, blocksize); 329970bbb3e0SAndrew Morton bh = sb_bread(sb, logical_sb_block); 3300ac27a0ecSDave Kleikamp if (!bh) { 3301b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, 3302b31e1552SEric Sandeen "Can't read superblock on 2nd try"); 3303ac27a0ecSDave Kleikamp goto failed_mount; 3304ac27a0ecSDave Kleikamp } 3305617ba13bSMingming Cao es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); 3306ac27a0ecSDave Kleikamp sbi->s_es = es; 3307617ba13bSMingming Cao if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { 3308b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, 3309b31e1552SEric Sandeen "Magic mismatch, very weird!"); 3310ac27a0ecSDave Kleikamp goto failed_mount; 3311ac27a0ecSDave Kleikamp } 3312ac27a0ecSDave Kleikamp } 3313ac27a0ecSDave Kleikamp 3314a13fb1a4SEric Sandeen has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb, 3315a13fb1a4SEric Sandeen EXT4_FEATURE_RO_COMPAT_HUGE_FILE); 3316f287a1a5STheodore Ts'o sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits, 3317f287a1a5STheodore Ts'o has_huge_files); 3318f287a1a5STheodore Ts'o sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files); 3319ac27a0ecSDave Kleikamp 3320617ba13bSMingming Cao if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { 3321617ba13bSMingming Cao sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; 3322617ba13bSMingming Cao sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; 3323ac27a0ecSDave Kleikamp } else { 3324ac27a0ecSDave Kleikamp sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 3325ac27a0ecSDave Kleikamp sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 3326617ba13bSMingming Cao if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || 33271330593eSVignesh Babu (!is_power_of_2(sbi->s_inode_size)) || 3328ac27a0ecSDave Kleikamp (sbi->s_inode_size > blocksize)) { 3329b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, 3330b31e1552SEric Sandeen "unsupported inode size: %d", 3331ac27a0ecSDave Kleikamp sbi->s_inode_size); 3332ac27a0ecSDave Kleikamp goto failed_mount; 3333ac27a0ecSDave Kleikamp } 3334ef7f3835SKalpak Shah if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) 3335ef7f3835SKalpak Shah sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); 3336ac27a0ecSDave Kleikamp } 33370b8e58a1SAndreas Dilger 33380d1ee42fSAlexandre Ratchov sbi->s_desc_size = le16_to_cpu(es->s_desc_size); 33390d1ee42fSAlexandre Ratchov if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { 33408fadc143SAlexandre Ratchov if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || 33410d1ee42fSAlexandre Ratchov sbi->s_desc_size > EXT4_MAX_DESC_SIZE || 3342d8ea6cf8Svignesh babu !is_power_of_2(sbi->s_desc_size)) { 3343b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, 3344b31e1552SEric Sandeen "unsupported descriptor size %lu", 33450d1ee42fSAlexandre Ratchov sbi->s_desc_size); 33460d1ee42fSAlexandre Ratchov goto failed_mount; 33470d1ee42fSAlexandre Ratchov } 33480d1ee42fSAlexandre Ratchov } else 33490d1ee42fSAlexandre Ratchov sbi->s_desc_size = EXT4_MIN_DESC_SIZE; 33500b8e58a1SAndreas Dilger 3351ac27a0ecSDave Kleikamp sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 3352ac27a0ecSDave Kleikamp sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 3353b47b6f38SAndries E. Brouwer if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0) 3354617ba13bSMingming Cao goto cantfind_ext4; 33550b8e58a1SAndreas Dilger 3356617ba13bSMingming Cao sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); 3357ac27a0ecSDave Kleikamp if (sbi->s_inodes_per_block == 0) 3358617ba13bSMingming Cao goto cantfind_ext4; 3359ac27a0ecSDave Kleikamp sbi->s_itb_per_group = sbi->s_inodes_per_group / 3360ac27a0ecSDave Kleikamp sbi->s_inodes_per_block; 33610d1ee42fSAlexandre Ratchov sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); 3362ac27a0ecSDave Kleikamp sbi->s_sbh = bh; 3363ac27a0ecSDave Kleikamp sbi->s_mount_state = le16_to_cpu(es->s_state); 3364e57aa839SFengguang Wu sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); 3365e57aa839SFengguang Wu sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); 33660b8e58a1SAndreas Dilger 3367ac27a0ecSDave Kleikamp for (i = 0; i < 4; i++) 3368ac27a0ecSDave Kleikamp sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); 3369ac27a0ecSDave Kleikamp sbi->s_def_hash_version = es->s_def_hash_version; 3370f99b2589STheodore Ts'o i = le32_to_cpu(es->s_flags); 3371f99b2589STheodore Ts'o if (i & EXT2_FLAGS_UNSIGNED_HASH) 3372f99b2589STheodore Ts'o sbi->s_hash_unsigned = 3; 3373f99b2589STheodore Ts'o else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) { 3374f99b2589STheodore Ts'o #ifdef __CHAR_UNSIGNED__ 3375f99b2589STheodore Ts'o es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH); 3376f99b2589STheodore Ts'o sbi->s_hash_unsigned = 3; 3377f99b2589STheodore Ts'o #else 3378f99b2589STheodore Ts'o es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH); 3379f99b2589STheodore Ts'o #endif 3380f99b2589STheodore Ts'o sb->s_dirt = 1; 3381f99b2589STheodore Ts'o } 3382ac27a0ecSDave Kleikamp 3383281b5995STheodore Ts'o /* Handle clustersize */ 3384281b5995STheodore Ts'o clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size); 3385281b5995STheodore Ts'o has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb, 3386281b5995STheodore Ts'o EXT4_FEATURE_RO_COMPAT_BIGALLOC); 3387281b5995STheodore Ts'o if (has_bigalloc) { 3388281b5995STheodore Ts'o if (clustersize < blocksize) { 3389281b5995STheodore Ts'o ext4_msg(sb, KERN_ERR, 3390281b5995STheodore Ts'o "cluster size (%d) smaller than " 3391281b5995STheodore Ts'o "block size (%d)", clustersize, blocksize); 3392281b5995STheodore Ts'o goto failed_mount; 3393281b5995STheodore Ts'o } 3394281b5995STheodore Ts'o sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) - 3395281b5995STheodore Ts'o le32_to_cpu(es->s_log_block_size); 3396281b5995STheodore Ts'o sbi->s_clusters_per_group = 3397281b5995STheodore Ts'o le32_to_cpu(es->s_clusters_per_group); 3398281b5995STheodore Ts'o if (sbi->s_clusters_per_group > blocksize * 8) { 3399281b5995STheodore Ts'o ext4_msg(sb, KERN_ERR, 3400281b5995STheodore Ts'o "#clusters per group too big: %lu", 3401281b5995STheodore Ts'o sbi->s_clusters_per_group); 3402281b5995STheodore Ts'o goto failed_mount; 3403281b5995STheodore Ts'o } 3404281b5995STheodore Ts'o if (sbi->s_blocks_per_group != 3405281b5995STheodore Ts'o (sbi->s_clusters_per_group * (clustersize / blocksize))) { 3406281b5995STheodore Ts'o ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and " 3407281b5995STheodore Ts'o "clusters per group (%lu) inconsistent", 3408281b5995STheodore Ts'o sbi->s_blocks_per_group, 3409281b5995STheodore Ts'o sbi->s_clusters_per_group); 3410281b5995STheodore Ts'o goto failed_mount; 3411281b5995STheodore Ts'o } 3412281b5995STheodore Ts'o } else { 3413281b5995STheodore Ts'o if (clustersize != blocksize) { 3414281b5995STheodore Ts'o ext4_warning(sb, "fragment/cluster size (%d) != " 3415281b5995STheodore Ts'o "block size (%d)", clustersize, 3416281b5995STheodore Ts'o blocksize); 3417281b5995STheodore Ts'o clustersize = blocksize; 3418281b5995STheodore Ts'o } 3419ac27a0ecSDave Kleikamp if (sbi->s_blocks_per_group > blocksize * 8) { 3420b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, 3421b31e1552SEric Sandeen "#blocks per group too big: %lu", 3422ac27a0ecSDave Kleikamp sbi->s_blocks_per_group); 3423ac27a0ecSDave Kleikamp goto failed_mount; 3424ac27a0ecSDave Kleikamp } 3425281b5995STheodore Ts'o sbi->s_clusters_per_group = sbi->s_blocks_per_group; 3426281b5995STheodore Ts'o sbi->s_cluster_bits = 0; 3427281b5995STheodore Ts'o } 3428281b5995STheodore Ts'o sbi->s_cluster_ratio = clustersize / blocksize; 3429281b5995STheodore Ts'o 3430ac27a0ecSDave Kleikamp if (sbi->s_inodes_per_group > blocksize * 8) { 3431b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, 3432b31e1552SEric Sandeen "#inodes per group too big: %lu", 3433ac27a0ecSDave Kleikamp sbi->s_inodes_per_group); 3434ac27a0ecSDave Kleikamp goto failed_mount; 3435ac27a0ecSDave Kleikamp } 3436ac27a0ecSDave Kleikamp 3437bf43d84bSEric Sandeen /* 3438bf43d84bSEric Sandeen * Test whether we have more sectors than will fit in sector_t, 3439bf43d84bSEric Sandeen * and whether the max offset is addressable by the page cache. 3440bf43d84bSEric Sandeen */ 34415a9ae68aSDarrick J. Wong err = generic_check_addressable(sb->s_blocksize_bits, 344230ca22c7SPatrick J. LoPresti ext4_blocks_count(es)); 34435a9ae68aSDarrick J. Wong if (err) { 3444b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "filesystem" 3445bf43d84bSEric Sandeen " too large to mount safely on this system"); 3446ac27a0ecSDave Kleikamp if (sizeof(sector_t) < 8) 344790c699a9SBartlomiej Zolnierkiewicz ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled"); 34485a9ae68aSDarrick J. Wong ret = err; 3449ac27a0ecSDave Kleikamp goto failed_mount; 3450ac27a0ecSDave Kleikamp } 3451ac27a0ecSDave Kleikamp 3452617ba13bSMingming Cao if (EXT4_BLOCKS_PER_GROUP(sb) == 0) 3453617ba13bSMingming Cao goto cantfind_ext4; 3454e7c95593SEric Sandeen 34550f2ddca6SFrom: Thiemo Nagel /* check blocks count against device size */ 34560f2ddca6SFrom: Thiemo Nagel blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits; 34570f2ddca6SFrom: Thiemo Nagel if (blocks_count && ext4_blocks_count(es) > blocks_count) { 3458b31e1552SEric Sandeen ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu " 3459b31e1552SEric Sandeen "exceeds size of device (%llu blocks)", 34600f2ddca6SFrom: Thiemo Nagel ext4_blocks_count(es), blocks_count); 34610f2ddca6SFrom: Thiemo Nagel goto failed_mount; 34620f2ddca6SFrom: Thiemo Nagel } 34630f2ddca6SFrom: Thiemo Nagel 34644ec11028STheodore Ts'o /* 34654ec11028STheodore Ts'o * It makes no sense for the first data block to be beyond the end 34664ec11028STheodore Ts'o * of the filesystem. 34674ec11028STheodore Ts'o */ 34684ec11028STheodore Ts'o if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) { 3469b31e1552SEric Sandeen ext4_msg(sb, KERN_WARNING, "bad geometry: first data " 3470b31e1552SEric Sandeen "block %u is beyond end of filesystem (%llu)", 3471e7c95593SEric Sandeen le32_to_cpu(es->s_first_data_block), 34724ec11028STheodore Ts'o ext4_blocks_count(es)); 3473e7c95593SEric Sandeen goto failed_mount; 3474e7c95593SEric Sandeen } 3475bd81d8eeSLaurent Vivier blocks_count = (ext4_blocks_count(es) - 3476bd81d8eeSLaurent Vivier le32_to_cpu(es->s_first_data_block) + 3477bd81d8eeSLaurent Vivier EXT4_BLOCKS_PER_GROUP(sb) - 1); 3478bd81d8eeSLaurent Vivier do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); 34794ec11028STheodore Ts'o if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) { 3480b31e1552SEric Sandeen ext4_msg(sb, KERN_WARNING, "groups count too large: %u " 34814ec11028STheodore Ts'o "(block count %llu, first data block %u, " 3482b31e1552SEric Sandeen "blocks per group %lu)", sbi->s_groups_count, 34834ec11028STheodore Ts'o ext4_blocks_count(es), 34844ec11028STheodore Ts'o le32_to_cpu(es->s_first_data_block), 34854ec11028STheodore Ts'o EXT4_BLOCKS_PER_GROUP(sb)); 34864ec11028STheodore Ts'o goto failed_mount; 34874ec11028STheodore Ts'o } 3488bd81d8eeSLaurent Vivier sbi->s_groups_count = blocks_count; 3489fb0a387dSEric Sandeen sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count, 3490fb0a387dSEric Sandeen (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb))); 3491617ba13bSMingming Cao db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / 3492617ba13bSMingming Cao EXT4_DESC_PER_BLOCK(sb); 3493f18a5f21STheodore Ts'o sbi->s_group_desc = ext4_kvmalloc(db_count * 3494f18a5f21STheodore Ts'o sizeof(struct buffer_head *), 3495ac27a0ecSDave Kleikamp GFP_KERNEL); 3496ac27a0ecSDave Kleikamp if (sbi->s_group_desc == NULL) { 3497b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "not enough memory"); 3498ac27a0ecSDave Kleikamp goto failed_mount; 3499ac27a0ecSDave Kleikamp } 3500ac27a0ecSDave Kleikamp 35019f6200bbSTheodore Ts'o if (ext4_proc_root) 35029f6200bbSTheodore Ts'o sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); 3503240799cdSTheodore Ts'o 3504705895b6SPekka Enberg bgl_lock_init(sbi->s_blockgroup_lock); 3505ac27a0ecSDave Kleikamp 3506ac27a0ecSDave Kleikamp for (i = 0; i < db_count; i++) { 350770bbb3e0SAndrew Morton block = descriptor_loc(sb, logical_sb_block, i); 3508ac27a0ecSDave Kleikamp sbi->s_group_desc[i] = sb_bread(sb, block); 3509ac27a0ecSDave Kleikamp if (!sbi->s_group_desc[i]) { 3510b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, 3511b31e1552SEric Sandeen "can't read group descriptor %d", i); 3512ac27a0ecSDave Kleikamp db_count = i; 3513ac27a0ecSDave Kleikamp goto failed_mount2; 3514ac27a0ecSDave Kleikamp } 3515ac27a0ecSDave Kleikamp } 3516bfff6873SLukas Czerner if (!ext4_check_descriptors(sb, &first_not_zeroed)) { 3517b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "group descriptors corrupted!"); 3518ac27a0ecSDave Kleikamp goto failed_mount2; 3519ac27a0ecSDave Kleikamp } 3520772cb7c8SJose R. Santos if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 3521772cb7c8SJose R. Santos if (!ext4_fill_flex_info(sb)) { 3522b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, 3523b31e1552SEric Sandeen "unable to initialize " 3524b31e1552SEric Sandeen "flex_bg meta info!"); 3525772cb7c8SJose R. Santos goto failed_mount2; 3526772cb7c8SJose R. Santos } 3527772cb7c8SJose R. Santos 3528ac27a0ecSDave Kleikamp sbi->s_gdb_count = db_count; 3529ac27a0ecSDave Kleikamp get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 3530ac27a0ecSDave Kleikamp spin_lock_init(&sbi->s_next_gen_lock); 3531ac27a0ecSDave Kleikamp 353204496411STao Ma init_timer(&sbi->s_err_report); 353304496411STao Ma sbi->s_err_report.function = print_daily_error_info; 353404496411STao Ma sbi->s_err_report.data = (unsigned long) sb; 353504496411STao Ma 353657042651STheodore Ts'o err = percpu_counter_init(&sbi->s_freeclusters_counter, 35375dee5437STheodore Ts'o ext4_count_free_clusters(sb)); 3538ce7e010aSTheodore Ts'o if (!err) { 3539ce7e010aSTheodore Ts'o err = percpu_counter_init(&sbi->s_freeinodes_counter, 3540ce7e010aSTheodore Ts'o ext4_count_free_inodes(sb)); 3541ce7e010aSTheodore Ts'o } 3542ce7e010aSTheodore Ts'o if (!err) { 3543ce7e010aSTheodore Ts'o err = percpu_counter_init(&sbi->s_dirs_counter, 3544ce7e010aSTheodore Ts'o ext4_count_dirs(sb)); 3545ce7e010aSTheodore Ts'o } 3546ce7e010aSTheodore Ts'o if (!err) { 354757042651STheodore Ts'o err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0); 3548ce7e010aSTheodore Ts'o } 3549ce7e010aSTheodore Ts'o if (err) { 3550ce7e010aSTheodore Ts'o ext4_msg(sb, KERN_ERR, "insufficient memory"); 3551ce7e010aSTheodore Ts'o goto failed_mount3; 3552ce7e010aSTheodore Ts'o } 3553ce7e010aSTheodore Ts'o 3554c9de560dSAlex Tomas sbi->s_stripe = ext4_get_stripe_size(sbi); 355555138e0bSTheodore Ts'o sbi->s_max_writeback_mb_bump = 128; 3556c9de560dSAlex Tomas 3557ac27a0ecSDave Kleikamp /* 3558ac27a0ecSDave Kleikamp * set up enough so that it can read an inode 3559ac27a0ecSDave Kleikamp */ 35609ca92389STheodore Ts'o if (!test_opt(sb, NOLOAD) && 35619ca92389STheodore Ts'o EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) 3562617ba13bSMingming Cao sb->s_op = &ext4_sops; 35639ca92389STheodore Ts'o else 35649ca92389STheodore Ts'o sb->s_op = &ext4_nojournal_sops; 3565617ba13bSMingming Cao sb->s_export_op = &ext4_export_ops; 3566617ba13bSMingming Cao sb->s_xattr = ext4_xattr_handlers; 3567ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 3568617ba13bSMingming Cao sb->s_qcop = &ext4_qctl_operations; 3569617ba13bSMingming Cao sb->dq_op = &ext4_quota_operations; 3570ac27a0ecSDave Kleikamp #endif 3571f2fa2ffcSAneesh Kumar K.V memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid)); 3572f2fa2ffcSAneesh Kumar K.V 3573ac27a0ecSDave Kleikamp INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ 35743b9d4ed2STheodore Ts'o mutex_init(&sbi->s_orphan_lock); 35758f82f840SYongqiang Yang sbi->s_resize_flags = 0; 3576ac27a0ecSDave Kleikamp 3577ac27a0ecSDave Kleikamp sb->s_root = NULL; 3578ac27a0ecSDave Kleikamp 3579ac27a0ecSDave Kleikamp needs_recovery = (es->s_last_orphan != 0 || 3580617ba13bSMingming Cao EXT4_HAS_INCOMPAT_FEATURE(sb, 3581617ba13bSMingming Cao EXT4_FEATURE_INCOMPAT_RECOVER)); 3582ac27a0ecSDave Kleikamp 3583c5e06d10SJohann Lombardi if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) && 3584c5e06d10SJohann Lombardi !(sb->s_flags & MS_RDONLY)) 3585c5e06d10SJohann Lombardi if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block))) 3586c5e06d10SJohann Lombardi goto failed_mount3; 3587c5e06d10SJohann Lombardi 3588ac27a0ecSDave Kleikamp /* 3589ac27a0ecSDave Kleikamp * The first inode we look at is the journal inode. Don't try 3590ac27a0ecSDave Kleikamp * root first: it may be modified in the journal! 3591ac27a0ecSDave Kleikamp */ 3592ac27a0ecSDave Kleikamp if (!test_opt(sb, NOLOAD) && 3593617ba13bSMingming Cao EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 3594617ba13bSMingming Cao if (ext4_load_journal(sb, es, journal_devnum)) 3595ac27a0ecSDave Kleikamp goto failed_mount3; 35960390131bSFrank Mayhar } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) && 35970390131bSFrank Mayhar EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 3598b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "required journal recovery " 3599b31e1552SEric Sandeen "suppressed and not mounted read-only"); 3600744692dcSJiaying Zhang goto failed_mount_wq; 3601ac27a0ecSDave Kleikamp } else { 3602fd8c37ecSTheodore Ts'o clear_opt(sb, DATA_FLAGS); 36030390131bSFrank Mayhar sbi->s_journal = NULL; 36040390131bSFrank Mayhar needs_recovery = 0; 36050390131bSFrank Mayhar goto no_journal; 3606ac27a0ecSDave Kleikamp } 3607ac27a0ecSDave Kleikamp 3608eb40a09cSJose R. Santos if (ext4_blocks_count(es) > 0xffffffffULL && 3609eb40a09cSJose R. Santos !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, 3610eb40a09cSJose R. Santos JBD2_FEATURE_INCOMPAT_64BIT)) { 3611b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature"); 3612744692dcSJiaying Zhang goto failed_mount_wq; 3613eb40a09cSJose R. Santos } 3614eb40a09cSJose R. Santos 3615d4da6c9cSLinus Torvalds if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 3616d4da6c9cSLinus Torvalds jbd2_journal_set_features(sbi->s_journal, 3617d4da6c9cSLinus Torvalds JBD2_FEATURE_COMPAT_CHECKSUM, 0, 3618d4da6c9cSLinus Torvalds JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 3619d4da6c9cSLinus Torvalds } else if (test_opt(sb, JOURNAL_CHECKSUM)) { 3620818d276cSGirish Shilamkar jbd2_journal_set_features(sbi->s_journal, 3621818d276cSGirish Shilamkar JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0); 3622818d276cSGirish Shilamkar jbd2_journal_clear_features(sbi->s_journal, 0, 0, 3623818d276cSGirish Shilamkar JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 3624d4da6c9cSLinus Torvalds } else { 3625d4da6c9cSLinus Torvalds jbd2_journal_clear_features(sbi->s_journal, 3626d4da6c9cSLinus Torvalds JBD2_FEATURE_COMPAT_CHECKSUM, 0, 3627d4da6c9cSLinus Torvalds JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 3628d4da6c9cSLinus Torvalds } 3629818d276cSGirish Shilamkar 3630ac27a0ecSDave Kleikamp /* We have now updated the journal if required, so we can 3631ac27a0ecSDave Kleikamp * validate the data journaling mode. */ 3632ac27a0ecSDave Kleikamp switch (test_opt(sb, DATA_FLAGS)) { 3633ac27a0ecSDave Kleikamp case 0: 3634ac27a0ecSDave Kleikamp /* No mode set, assume a default based on the journal 363563f57933SAndrew Morton * capabilities: ORDERED_DATA if the journal can 363663f57933SAndrew Morton * cope, else JOURNAL_DATA 363763f57933SAndrew Morton */ 3638dab291afSMingming Cao if (jbd2_journal_check_available_features 3639dab291afSMingming Cao (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) 3640fd8c37ecSTheodore Ts'o set_opt(sb, ORDERED_DATA); 3641ac27a0ecSDave Kleikamp else 3642fd8c37ecSTheodore Ts'o set_opt(sb, JOURNAL_DATA); 3643ac27a0ecSDave Kleikamp break; 3644ac27a0ecSDave Kleikamp 3645617ba13bSMingming Cao case EXT4_MOUNT_ORDERED_DATA: 3646617ba13bSMingming Cao case EXT4_MOUNT_WRITEBACK_DATA: 3647dab291afSMingming Cao if (!jbd2_journal_check_available_features 3648dab291afSMingming Cao (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { 3649b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "Journal does not support " 3650b31e1552SEric Sandeen "requested data journaling mode"); 3651744692dcSJiaying Zhang goto failed_mount_wq; 3652ac27a0ecSDave Kleikamp } 3653ac27a0ecSDave Kleikamp default: 3654ac27a0ecSDave Kleikamp break; 3655ac27a0ecSDave Kleikamp } 3656b3881f74STheodore Ts'o set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); 3657ac27a0ecSDave Kleikamp 365818aadd47SBobi Jam sbi->s_journal->j_commit_callback = ext4_journal_commit_callback; 365918aadd47SBobi Jam 3660ce7e010aSTheodore Ts'o /* 3661ce7e010aSTheodore Ts'o * The journal may have updated the bg summary counts, so we 3662ce7e010aSTheodore Ts'o * need to update the global counters. 3663ce7e010aSTheodore Ts'o */ 366457042651STheodore Ts'o percpu_counter_set(&sbi->s_freeclusters_counter, 36655dee5437STheodore Ts'o ext4_count_free_clusters(sb)); 3666ce7e010aSTheodore Ts'o percpu_counter_set(&sbi->s_freeinodes_counter, 366784061e07SDmitry Monakhov ext4_count_free_inodes(sb)); 3668ce7e010aSTheodore Ts'o percpu_counter_set(&sbi->s_dirs_counter, 366984061e07SDmitry Monakhov ext4_count_dirs(sb)); 367057042651STheodore Ts'o percpu_counter_set(&sbi->s_dirtyclusters_counter, 0); 3671206f7ab4SChristoph Hellwig 3672ce7e010aSTheodore Ts'o no_journal: 3673fd89d5f2STejun Heo /* 3674fd89d5f2STejun Heo * The maximum number of concurrent works can be high and 3675fd89d5f2STejun Heo * concurrency isn't really necessary. Limit it to 1. 3676fd89d5f2STejun Heo */ 3677fd89d5f2STejun Heo EXT4_SB(sb)->dio_unwritten_wq = 3678ae005cbeSLinus Torvalds alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1); 36794c0425ffSMingming Cao if (!EXT4_SB(sb)->dio_unwritten_wq) { 36804c0425ffSMingming Cao printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n"); 36814c0425ffSMingming Cao goto failed_mount_wq; 36824c0425ffSMingming Cao } 36834c0425ffSMingming Cao 3684ac27a0ecSDave Kleikamp /* 3685dab291afSMingming Cao * The jbd2_journal_load will have done any necessary log recovery, 3686ac27a0ecSDave Kleikamp * so we can safely mount the rest of the filesystem now. 3687ac27a0ecSDave Kleikamp */ 3688ac27a0ecSDave Kleikamp 36891d1fe1eeSDavid Howells root = ext4_iget(sb, EXT4_ROOT_INO); 36901d1fe1eeSDavid Howells if (IS_ERR(root)) { 3691b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "get root inode failed"); 36921d1fe1eeSDavid Howells ret = PTR_ERR(root); 369332a9bb57SManish Katiyar root = NULL; 3694ac27a0ecSDave Kleikamp goto failed_mount4; 3695ac27a0ecSDave Kleikamp } 3696ac27a0ecSDave Kleikamp if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 3697b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck"); 369894bf608aSAl Viro iput(root); 3699ac27a0ecSDave Kleikamp goto failed_mount4; 3700ac27a0ecSDave Kleikamp } 37011d1fe1eeSDavid Howells sb->s_root = d_alloc_root(root); 37021d1fe1eeSDavid Howells if (!sb->s_root) { 370394bf608aSAl Viro iput(root); 3704b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "get root dentry failed"); 37051d1fe1eeSDavid Howells ret = -ENOMEM; 37061d1fe1eeSDavid Howells goto failed_mount4; 37071d1fe1eeSDavid Howells } 3708ac27a0ecSDave Kleikamp 3709617ba13bSMingming Cao ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY); 3710ef7f3835SKalpak Shah 3711ef7f3835SKalpak Shah /* determine the minimum size of new large inodes, if present */ 3712ef7f3835SKalpak Shah if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { 3713ef7f3835SKalpak Shah sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 3714ef7f3835SKalpak Shah EXT4_GOOD_OLD_INODE_SIZE; 3715ef7f3835SKalpak Shah if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 3716ef7f3835SKalpak Shah EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { 3717ef7f3835SKalpak Shah if (sbi->s_want_extra_isize < 3718ef7f3835SKalpak Shah le16_to_cpu(es->s_want_extra_isize)) 3719ef7f3835SKalpak Shah sbi->s_want_extra_isize = 3720ef7f3835SKalpak Shah le16_to_cpu(es->s_want_extra_isize); 3721ef7f3835SKalpak Shah if (sbi->s_want_extra_isize < 3722ef7f3835SKalpak Shah le16_to_cpu(es->s_min_extra_isize)) 3723ef7f3835SKalpak Shah sbi->s_want_extra_isize = 3724ef7f3835SKalpak Shah le16_to_cpu(es->s_min_extra_isize); 3725ef7f3835SKalpak Shah } 3726ef7f3835SKalpak Shah } 3727ef7f3835SKalpak Shah /* Check if enough inode space is available */ 3728ef7f3835SKalpak Shah if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > 3729ef7f3835SKalpak Shah sbi->s_inode_size) { 3730ef7f3835SKalpak Shah sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 3731ef7f3835SKalpak Shah EXT4_GOOD_OLD_INODE_SIZE; 3732b31e1552SEric Sandeen ext4_msg(sb, KERN_INFO, "required extra inode space not" 3733b31e1552SEric Sandeen "available"); 3734ef7f3835SKalpak Shah } 3735ef7f3835SKalpak Shah 37366fd058f7STheodore Ts'o err = ext4_setup_system_zone(sb); 37376fd058f7STheodore Ts'o if (err) { 3738b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "failed to initialize system " 3739fbe845ddSCurt Wohlgemuth "zone (%d)", err); 374094bf608aSAl Viro goto failed_mount4a; 37416fd058f7STheodore Ts'o } 37426fd058f7STheodore Ts'o 3743c2774d84SAneesh Kumar K.V ext4_ext_init(sb); 3744c2774d84SAneesh Kumar K.V err = ext4_mb_init(sb, needs_recovery); 3745c2774d84SAneesh Kumar K.V if (err) { 3746421f91d2SUwe Kleine-König ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)", 3747c2774d84SAneesh Kumar K.V err); 3748dcf2d804STao Ma goto failed_mount5; 3749c2774d84SAneesh Kumar K.V } 3750c2774d84SAneesh Kumar K.V 3751bfff6873SLukas Czerner err = ext4_register_li_request(sb, first_not_zeroed); 3752bfff6873SLukas Czerner if (err) 3753dcf2d804STao Ma goto failed_mount6; 3754bfff6873SLukas Czerner 37553197ebdbSTheodore Ts'o sbi->s_kobj.kset = ext4_kset; 37563197ebdbSTheodore Ts'o init_completion(&sbi->s_kobj_unregister); 37573197ebdbSTheodore Ts'o err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL, 37583197ebdbSTheodore Ts'o "%s", sb->s_id); 3759dcf2d804STao Ma if (err) 3760dcf2d804STao Ma goto failed_mount7; 37613197ebdbSTheodore Ts'o 3762617ba13bSMingming Cao EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; 3763617ba13bSMingming Cao ext4_orphan_cleanup(sb, es); 3764617ba13bSMingming Cao EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; 37650390131bSFrank Mayhar if (needs_recovery) { 3766b31e1552SEric Sandeen ext4_msg(sb, KERN_INFO, "recovery complete"); 3767617ba13bSMingming Cao ext4_mark_recovery_complete(sb, es); 37680390131bSFrank Mayhar } 37690390131bSFrank Mayhar if (EXT4_SB(sb)->s_journal) { 37700390131bSFrank Mayhar if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 37710390131bSFrank Mayhar descr = " journalled data mode"; 37720390131bSFrank Mayhar else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 37730390131bSFrank Mayhar descr = " ordered data mode"; 37740390131bSFrank Mayhar else 37750390131bSFrank Mayhar descr = " writeback data mode"; 37760390131bSFrank Mayhar } else 37770390131bSFrank Mayhar descr = "out journal"; 37780390131bSFrank Mayhar 3779d4c402d9SCurt Wohlgemuth ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. " 37808b67f04aSTheodore Ts'o "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts, 37818b67f04aSTheodore Ts'o *sbi->s_es->s_mount_opts ? "; " : "", orig_data); 3782ac27a0ecSDave Kleikamp 378366e61a9eSTheodore Ts'o if (es->s_error_count) 378466e61a9eSTheodore Ts'o mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */ 3785ac27a0ecSDave Kleikamp 3786d4c402d9SCurt Wohlgemuth kfree(orig_data); 3787ac27a0ecSDave Kleikamp return 0; 3788ac27a0ecSDave Kleikamp 3789617ba13bSMingming Cao cantfind_ext4: 3790ac27a0ecSDave Kleikamp if (!silent) 3791b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem"); 3792ac27a0ecSDave Kleikamp goto failed_mount; 3793ac27a0ecSDave Kleikamp 3794dcf2d804STao Ma failed_mount7: 3795dcf2d804STao Ma ext4_unregister_li_request(sb); 3796dcf2d804STao Ma failed_mount6: 3797dcf2d804STao Ma ext4_mb_release(sb); 379894bf608aSAl Viro failed_mount5: 379994bf608aSAl Viro ext4_ext_release(sb); 3800dcf2d804STao Ma ext4_release_system_zone(sb); 380194bf608aSAl Viro failed_mount4a: 380294bf608aSAl Viro dput(sb->s_root); 380332a9bb57SManish Katiyar sb->s_root = NULL; 380494bf608aSAl Viro failed_mount4: 3805b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "mount failed"); 38064c0425ffSMingming Cao destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq); 38074c0425ffSMingming Cao failed_mount_wq: 38080390131bSFrank Mayhar if (sbi->s_journal) { 3809dab291afSMingming Cao jbd2_journal_destroy(sbi->s_journal); 381047b4a50bSJan Kara sbi->s_journal = NULL; 38110390131bSFrank Mayhar } 3812ac27a0ecSDave Kleikamp failed_mount3: 381304496411STao Ma del_timer(&sbi->s_err_report); 38149933fc0aSTheodore Ts'o if (sbi->s_flex_groups) 38159933fc0aSTheodore Ts'o ext4_kvfree(sbi->s_flex_groups); 381657042651STheodore Ts'o percpu_counter_destroy(&sbi->s_freeclusters_counter); 3817ce7e010aSTheodore Ts'o percpu_counter_destroy(&sbi->s_freeinodes_counter); 3818ce7e010aSTheodore Ts'o percpu_counter_destroy(&sbi->s_dirs_counter); 381957042651STheodore Ts'o percpu_counter_destroy(&sbi->s_dirtyclusters_counter); 3820c5e06d10SJohann Lombardi if (sbi->s_mmp_tsk) 3821c5e06d10SJohann Lombardi kthread_stop(sbi->s_mmp_tsk); 3822ac27a0ecSDave Kleikamp failed_mount2: 3823ac27a0ecSDave Kleikamp for (i = 0; i < db_count; i++) 3824ac27a0ecSDave Kleikamp brelse(sbi->s_group_desc[i]); 3825f18a5f21STheodore Ts'o ext4_kvfree(sbi->s_group_desc); 3826ac27a0ecSDave Kleikamp failed_mount: 3827240799cdSTheodore Ts'o if (sbi->s_proc) { 38289f6200bbSTheodore Ts'o remove_proc_entry(sb->s_id, ext4_proc_root); 3829240799cdSTheodore Ts'o } 3830ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 3831ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) 3832ac27a0ecSDave Kleikamp kfree(sbi->s_qf_names[i]); 3833ac27a0ecSDave Kleikamp #endif 3834617ba13bSMingming Cao ext4_blkdev_remove(sbi); 3835ac27a0ecSDave Kleikamp brelse(bh); 3836ac27a0ecSDave Kleikamp out_fail: 3837ac27a0ecSDave Kleikamp sb->s_fs_info = NULL; 3838f6830165SManish Katiyar kfree(sbi->s_blockgroup_lock); 3839ac27a0ecSDave Kleikamp kfree(sbi); 3840dcc7dae3SCyrill Gorcunov out_free_orig: 3841d4c402d9SCurt Wohlgemuth kfree(orig_data); 38421d1fe1eeSDavid Howells return ret; 3843ac27a0ecSDave Kleikamp } 3844ac27a0ecSDave Kleikamp 3845ac27a0ecSDave Kleikamp /* 3846ac27a0ecSDave Kleikamp * Setup any per-fs journal parameters now. We'll do this both on 3847ac27a0ecSDave Kleikamp * initial mount, once the journal has been initialised but before we've 3848ac27a0ecSDave Kleikamp * done any recovery; and again on any subsequent remount. 3849ac27a0ecSDave Kleikamp */ 3850617ba13bSMingming Cao static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) 3851ac27a0ecSDave Kleikamp { 3852617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 3853ac27a0ecSDave Kleikamp 3854ac27a0ecSDave Kleikamp journal->j_commit_interval = sbi->s_commit_interval; 385530773840STheodore Ts'o journal->j_min_batch_time = sbi->s_min_batch_time; 385630773840STheodore Ts'o journal->j_max_batch_time = sbi->s_max_batch_time; 3857ac27a0ecSDave Kleikamp 3858a931da6aSTheodore Ts'o write_lock(&journal->j_state_lock); 3859ac27a0ecSDave Kleikamp if (test_opt(sb, BARRIER)) 3860dab291afSMingming Cao journal->j_flags |= JBD2_BARRIER; 3861ac27a0ecSDave Kleikamp else 3862dab291afSMingming Cao journal->j_flags &= ~JBD2_BARRIER; 38635bf5683aSHidehiro Kawai if (test_opt(sb, DATA_ERR_ABORT)) 38645bf5683aSHidehiro Kawai journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR; 38655bf5683aSHidehiro Kawai else 38665bf5683aSHidehiro Kawai journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR; 3867a931da6aSTheodore Ts'o write_unlock(&journal->j_state_lock); 3868ac27a0ecSDave Kleikamp } 3869ac27a0ecSDave Kleikamp 3870617ba13bSMingming Cao static journal_t *ext4_get_journal(struct super_block *sb, 3871ac27a0ecSDave Kleikamp unsigned int journal_inum) 3872ac27a0ecSDave Kleikamp { 3873ac27a0ecSDave Kleikamp struct inode *journal_inode; 3874ac27a0ecSDave Kleikamp journal_t *journal; 3875ac27a0ecSDave Kleikamp 38760390131bSFrank Mayhar BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 38770390131bSFrank Mayhar 3878ac27a0ecSDave Kleikamp /* First, test for the existence of a valid inode on disk. Bad 3879ac27a0ecSDave Kleikamp * things happen if we iget() an unused inode, as the subsequent 3880ac27a0ecSDave Kleikamp * iput() will try to delete it. */ 3881ac27a0ecSDave Kleikamp 38821d1fe1eeSDavid Howells journal_inode = ext4_iget(sb, journal_inum); 38831d1fe1eeSDavid Howells if (IS_ERR(journal_inode)) { 3884b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "no journal found"); 3885ac27a0ecSDave Kleikamp return NULL; 3886ac27a0ecSDave Kleikamp } 3887ac27a0ecSDave Kleikamp if (!journal_inode->i_nlink) { 3888ac27a0ecSDave Kleikamp make_bad_inode(journal_inode); 3889ac27a0ecSDave Kleikamp iput(journal_inode); 3890b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "journal inode is deleted"); 3891ac27a0ecSDave Kleikamp return NULL; 3892ac27a0ecSDave Kleikamp } 3893ac27a0ecSDave Kleikamp 3894e5f8eab8STheodore Ts'o jbd_debug(2, "Journal inode found at %p: %lld bytes\n", 3895ac27a0ecSDave Kleikamp journal_inode, journal_inode->i_size); 38961d1fe1eeSDavid Howells if (!S_ISREG(journal_inode->i_mode)) { 3897b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "invalid journal inode"); 3898ac27a0ecSDave Kleikamp iput(journal_inode); 3899ac27a0ecSDave Kleikamp return NULL; 3900ac27a0ecSDave Kleikamp } 3901ac27a0ecSDave Kleikamp 3902dab291afSMingming Cao journal = jbd2_journal_init_inode(journal_inode); 3903ac27a0ecSDave Kleikamp if (!journal) { 3904b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "Could not load journal inode"); 3905ac27a0ecSDave Kleikamp iput(journal_inode); 3906ac27a0ecSDave Kleikamp return NULL; 3907ac27a0ecSDave Kleikamp } 3908ac27a0ecSDave Kleikamp journal->j_private = sb; 3909617ba13bSMingming Cao ext4_init_journal_params(sb, journal); 3910ac27a0ecSDave Kleikamp return journal; 3911ac27a0ecSDave Kleikamp } 3912ac27a0ecSDave Kleikamp 3913617ba13bSMingming Cao static journal_t *ext4_get_dev_journal(struct super_block *sb, 3914ac27a0ecSDave Kleikamp dev_t j_dev) 3915ac27a0ecSDave Kleikamp { 3916ac27a0ecSDave Kleikamp struct buffer_head *bh; 3917ac27a0ecSDave Kleikamp journal_t *journal; 3918617ba13bSMingming Cao ext4_fsblk_t start; 3919617ba13bSMingming Cao ext4_fsblk_t len; 3920ac27a0ecSDave Kleikamp int hblock, blocksize; 3921617ba13bSMingming Cao ext4_fsblk_t sb_block; 3922ac27a0ecSDave Kleikamp unsigned long offset; 3923617ba13bSMingming Cao struct ext4_super_block *es; 3924ac27a0ecSDave Kleikamp struct block_device *bdev; 3925ac27a0ecSDave Kleikamp 39260390131bSFrank Mayhar BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 39270390131bSFrank Mayhar 3928b31e1552SEric Sandeen bdev = ext4_blkdev_get(j_dev, sb); 3929ac27a0ecSDave Kleikamp if (bdev == NULL) 3930ac27a0ecSDave Kleikamp return NULL; 3931ac27a0ecSDave Kleikamp 3932ac27a0ecSDave Kleikamp blocksize = sb->s_blocksize; 3933e1defc4fSMartin K. Petersen hblock = bdev_logical_block_size(bdev); 3934ac27a0ecSDave Kleikamp if (blocksize < hblock) { 3935b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, 3936b31e1552SEric Sandeen "blocksize too small for journal device"); 3937ac27a0ecSDave Kleikamp goto out_bdev; 3938ac27a0ecSDave Kleikamp } 3939ac27a0ecSDave Kleikamp 3940617ba13bSMingming Cao sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; 3941617ba13bSMingming Cao offset = EXT4_MIN_BLOCK_SIZE % blocksize; 3942ac27a0ecSDave Kleikamp set_blocksize(bdev, blocksize); 3943ac27a0ecSDave Kleikamp if (!(bh = __bread(bdev, sb_block, blocksize))) { 3944b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "couldn't read superblock of " 3945b31e1552SEric Sandeen "external journal"); 3946ac27a0ecSDave Kleikamp goto out_bdev; 3947ac27a0ecSDave Kleikamp } 3948ac27a0ecSDave Kleikamp 3949617ba13bSMingming Cao es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 3950617ba13bSMingming Cao if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || 3951ac27a0ecSDave Kleikamp !(le32_to_cpu(es->s_feature_incompat) & 3952617ba13bSMingming Cao EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { 3953b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "external journal has " 3954b31e1552SEric Sandeen "bad superblock"); 3955ac27a0ecSDave Kleikamp brelse(bh); 3956ac27a0ecSDave Kleikamp goto out_bdev; 3957ac27a0ecSDave Kleikamp } 3958ac27a0ecSDave Kleikamp 3959617ba13bSMingming Cao if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { 3960b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "journal UUID does not match"); 3961ac27a0ecSDave Kleikamp brelse(bh); 3962ac27a0ecSDave Kleikamp goto out_bdev; 3963ac27a0ecSDave Kleikamp } 3964ac27a0ecSDave Kleikamp 3965bd81d8eeSLaurent Vivier len = ext4_blocks_count(es); 3966ac27a0ecSDave Kleikamp start = sb_block + 1; 3967ac27a0ecSDave Kleikamp brelse(bh); /* we're done with the superblock */ 3968ac27a0ecSDave Kleikamp 3969dab291afSMingming Cao journal = jbd2_journal_init_dev(bdev, sb->s_bdev, 3970ac27a0ecSDave Kleikamp start, len, blocksize); 3971ac27a0ecSDave Kleikamp if (!journal) { 3972b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "failed to create device journal"); 3973ac27a0ecSDave Kleikamp goto out_bdev; 3974ac27a0ecSDave Kleikamp } 3975ac27a0ecSDave Kleikamp journal->j_private = sb; 3976ac27a0ecSDave Kleikamp ll_rw_block(READ, 1, &journal->j_sb_buffer); 3977ac27a0ecSDave Kleikamp wait_on_buffer(journal->j_sb_buffer); 3978ac27a0ecSDave Kleikamp if (!buffer_uptodate(journal->j_sb_buffer)) { 3979b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "I/O error on journal device"); 3980ac27a0ecSDave Kleikamp goto out_journal; 3981ac27a0ecSDave Kleikamp } 3982ac27a0ecSDave Kleikamp if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { 3983b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "External journal has more than one " 3984b31e1552SEric Sandeen "user (unsupported) - %d", 3985ac27a0ecSDave Kleikamp be32_to_cpu(journal->j_superblock->s_nr_users)); 3986ac27a0ecSDave Kleikamp goto out_journal; 3987ac27a0ecSDave Kleikamp } 3988617ba13bSMingming Cao EXT4_SB(sb)->journal_bdev = bdev; 3989617ba13bSMingming Cao ext4_init_journal_params(sb, journal); 3990ac27a0ecSDave Kleikamp return journal; 39910b8e58a1SAndreas Dilger 3992ac27a0ecSDave Kleikamp out_journal: 3993dab291afSMingming Cao jbd2_journal_destroy(journal); 3994ac27a0ecSDave Kleikamp out_bdev: 3995617ba13bSMingming Cao ext4_blkdev_put(bdev); 3996ac27a0ecSDave Kleikamp return NULL; 3997ac27a0ecSDave Kleikamp } 3998ac27a0ecSDave Kleikamp 3999617ba13bSMingming Cao static int ext4_load_journal(struct super_block *sb, 4000617ba13bSMingming Cao struct ext4_super_block *es, 4001ac27a0ecSDave Kleikamp unsigned long journal_devnum) 4002ac27a0ecSDave Kleikamp { 4003ac27a0ecSDave Kleikamp journal_t *journal; 4004ac27a0ecSDave Kleikamp unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); 4005ac27a0ecSDave Kleikamp dev_t journal_dev; 4006ac27a0ecSDave Kleikamp int err = 0; 4007ac27a0ecSDave Kleikamp int really_read_only; 4008ac27a0ecSDave Kleikamp 40090390131bSFrank Mayhar BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 40100390131bSFrank Mayhar 4011ac27a0ecSDave Kleikamp if (journal_devnum && 4012ac27a0ecSDave Kleikamp journal_devnum != le32_to_cpu(es->s_journal_dev)) { 4013b31e1552SEric Sandeen ext4_msg(sb, KERN_INFO, "external journal device major/minor " 4014b31e1552SEric Sandeen "numbers have changed"); 4015ac27a0ecSDave Kleikamp journal_dev = new_decode_dev(journal_devnum); 4016ac27a0ecSDave Kleikamp } else 4017ac27a0ecSDave Kleikamp journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); 4018ac27a0ecSDave Kleikamp 4019ac27a0ecSDave Kleikamp really_read_only = bdev_read_only(sb->s_bdev); 4020ac27a0ecSDave Kleikamp 4021ac27a0ecSDave Kleikamp /* 4022ac27a0ecSDave Kleikamp * Are we loading a blank journal or performing recovery after a 4023ac27a0ecSDave Kleikamp * crash? For recovery, we need to check in advance whether we 4024ac27a0ecSDave Kleikamp * can get read-write access to the device. 4025ac27a0ecSDave Kleikamp */ 4026617ba13bSMingming Cao if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 4027ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) { 4028b31e1552SEric Sandeen ext4_msg(sb, KERN_INFO, "INFO: recovery " 4029b31e1552SEric Sandeen "required on readonly filesystem"); 4030ac27a0ecSDave Kleikamp if (really_read_only) { 4031b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "write access " 4032b31e1552SEric Sandeen "unavailable, cannot proceed"); 4033ac27a0ecSDave Kleikamp return -EROFS; 4034ac27a0ecSDave Kleikamp } 4035b31e1552SEric Sandeen ext4_msg(sb, KERN_INFO, "write access will " 4036b31e1552SEric Sandeen "be enabled during recovery"); 4037ac27a0ecSDave Kleikamp } 4038ac27a0ecSDave Kleikamp } 4039ac27a0ecSDave Kleikamp 4040ac27a0ecSDave Kleikamp if (journal_inum && journal_dev) { 4041b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "filesystem has both journal " 4042b31e1552SEric Sandeen "and inode journals!"); 4043ac27a0ecSDave Kleikamp return -EINVAL; 4044ac27a0ecSDave Kleikamp } 4045ac27a0ecSDave Kleikamp 4046ac27a0ecSDave Kleikamp if (journal_inum) { 4047617ba13bSMingming Cao if (!(journal = ext4_get_journal(sb, journal_inum))) 4048ac27a0ecSDave Kleikamp return -EINVAL; 4049ac27a0ecSDave Kleikamp } else { 4050617ba13bSMingming Cao if (!(journal = ext4_get_dev_journal(sb, journal_dev))) 4051ac27a0ecSDave Kleikamp return -EINVAL; 4052ac27a0ecSDave Kleikamp } 4053ac27a0ecSDave Kleikamp 405490576c0bSTheodore Ts'o if (!(journal->j_flags & JBD2_BARRIER)) 4055b31e1552SEric Sandeen ext4_msg(sb, KERN_INFO, "barriers disabled"); 40564776004fSTheodore Ts'o 4057617ba13bSMingming Cao if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) 4058dab291afSMingming Cao err = jbd2_journal_wipe(journal, !really_read_only); 40591c13d5c0STheodore Ts'o if (!err) { 40601c13d5c0STheodore Ts'o char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL); 40611c13d5c0STheodore Ts'o if (save) 40621c13d5c0STheodore Ts'o memcpy(save, ((char *) es) + 40631c13d5c0STheodore Ts'o EXT4_S_ERR_START, EXT4_S_ERR_LEN); 4064dab291afSMingming Cao err = jbd2_journal_load(journal); 40651c13d5c0STheodore Ts'o if (save) 40661c13d5c0STheodore Ts'o memcpy(((char *) es) + EXT4_S_ERR_START, 40671c13d5c0STheodore Ts'o save, EXT4_S_ERR_LEN); 40681c13d5c0STheodore Ts'o kfree(save); 40691c13d5c0STheodore Ts'o } 4070ac27a0ecSDave Kleikamp 4071ac27a0ecSDave Kleikamp if (err) { 4072b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "error loading journal"); 4073dab291afSMingming Cao jbd2_journal_destroy(journal); 4074ac27a0ecSDave Kleikamp return err; 4075ac27a0ecSDave Kleikamp } 4076ac27a0ecSDave Kleikamp 4077617ba13bSMingming Cao EXT4_SB(sb)->s_journal = journal; 4078617ba13bSMingming Cao ext4_clear_journal_err(sb, es); 4079ac27a0ecSDave Kleikamp 4080c41303ceSMaciej Żenczykowski if (!really_read_only && journal_devnum && 4081ac27a0ecSDave Kleikamp journal_devnum != le32_to_cpu(es->s_journal_dev)) { 4082ac27a0ecSDave Kleikamp es->s_journal_dev = cpu_to_le32(journal_devnum); 4083ac27a0ecSDave Kleikamp 4084ac27a0ecSDave Kleikamp /* Make sure we flush the recovery flag to disk. */ 4085e2d67052STheodore Ts'o ext4_commit_super(sb, 1); 4086ac27a0ecSDave Kleikamp } 4087ac27a0ecSDave Kleikamp 4088ac27a0ecSDave Kleikamp return 0; 4089ac27a0ecSDave Kleikamp } 4090ac27a0ecSDave Kleikamp 4091e2d67052STheodore Ts'o static int ext4_commit_super(struct super_block *sb, int sync) 4092ac27a0ecSDave Kleikamp { 4093e2d67052STheodore Ts'o struct ext4_super_block *es = EXT4_SB(sb)->s_es; 4094617ba13bSMingming Cao struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; 4095c4be0c1dSTakashi Sato int error = 0; 4096ac27a0ecSDave Kleikamp 40977c2e7087STheodore Ts'o if (!sbh || block_device_ejected(sb)) 4098c4be0c1dSTakashi Sato return error; 4099914258bfSTheodore Ts'o if (buffer_write_io_error(sbh)) { 4100914258bfSTheodore Ts'o /* 4101914258bfSTheodore Ts'o * Oh, dear. A previous attempt to write the 4102914258bfSTheodore Ts'o * superblock failed. This could happen because the 4103914258bfSTheodore Ts'o * USB device was yanked out. Or it could happen to 4104914258bfSTheodore Ts'o * be a transient write error and maybe the block will 4105914258bfSTheodore Ts'o * be remapped. Nothing we can do but to retry the 4106914258bfSTheodore Ts'o * write and hope for the best. 4107914258bfSTheodore Ts'o */ 4108b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "previous I/O error to " 4109b31e1552SEric Sandeen "superblock detected"); 4110914258bfSTheodore Ts'o clear_buffer_write_io_error(sbh); 4111914258bfSTheodore Ts'o set_buffer_uptodate(sbh); 4112914258bfSTheodore Ts'o } 411371290b36STheodore Ts'o /* 411471290b36STheodore Ts'o * If the file system is mounted read-only, don't update the 411571290b36STheodore Ts'o * superblock write time. This avoids updating the superblock 411671290b36STheodore Ts'o * write time when we are mounting the root file system 411771290b36STheodore Ts'o * read/only but we need to replay the journal; at that point, 411871290b36STheodore Ts'o * for people who are east of GMT and who make their clock 411971290b36STheodore Ts'o * tick in localtime for Windows bug-for-bug compatibility, 412071290b36STheodore Ts'o * the clock is set in the future, and this will cause e2fsck 412171290b36STheodore Ts'o * to complain and force a full file system check. 412271290b36STheodore Ts'o */ 412371290b36STheodore Ts'o if (!(sb->s_flags & MS_RDONLY)) 4124ac27a0ecSDave Kleikamp es->s_wtime = cpu_to_le32(get_seconds()); 4125f613dfcbSTheodore Ts'o if (sb->s_bdev->bd_part) 4126afc32f7eSTheodore Ts'o es->s_kbytes_written = 4127afc32f7eSTheodore Ts'o cpu_to_le64(EXT4_SB(sb)->s_kbytes_written + 4128afc32f7eSTheodore Ts'o ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 4129afc32f7eSTheodore Ts'o EXT4_SB(sb)->s_sectors_written_start) >> 1)); 4130f613dfcbSTheodore Ts'o else 4131f613dfcbSTheodore Ts'o es->s_kbytes_written = 4132f613dfcbSTheodore Ts'o cpu_to_le64(EXT4_SB(sb)->s_kbytes_written); 413357042651STheodore Ts'o ext4_free_blocks_count_set(es, 413457042651STheodore Ts'o EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive( 413557042651STheodore Ts'o &EXT4_SB(sb)->s_freeclusters_counter))); 41367f93cff9STheodore Ts'o es->s_free_inodes_count = 41377f93cff9STheodore Ts'o cpu_to_le32(percpu_counter_sum_positive( 41385d1b1b3fSAneesh Kumar K.V &EXT4_SB(sb)->s_freeinodes_counter)); 41397234ab2aSTheodore Ts'o sb->s_dirt = 0; 4140ac27a0ecSDave Kleikamp BUFFER_TRACE(sbh, "marking dirty"); 4141ac27a0ecSDave Kleikamp mark_buffer_dirty(sbh); 4142914258bfSTheodore Ts'o if (sync) { 4143c4be0c1dSTakashi Sato error = sync_dirty_buffer(sbh); 4144c4be0c1dSTakashi Sato if (error) 4145c4be0c1dSTakashi Sato return error; 4146c4be0c1dSTakashi Sato 4147c4be0c1dSTakashi Sato error = buffer_write_io_error(sbh); 4148c4be0c1dSTakashi Sato if (error) { 4149b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, "I/O error while writing " 4150b31e1552SEric Sandeen "superblock"); 4151914258bfSTheodore Ts'o clear_buffer_write_io_error(sbh); 4152914258bfSTheodore Ts'o set_buffer_uptodate(sbh); 4153914258bfSTheodore Ts'o } 4154914258bfSTheodore Ts'o } 4155c4be0c1dSTakashi Sato return error; 4156ac27a0ecSDave Kleikamp } 4157ac27a0ecSDave Kleikamp 4158ac27a0ecSDave Kleikamp /* 4159ac27a0ecSDave Kleikamp * Have we just finished recovery? If so, and if we are mounting (or 4160ac27a0ecSDave Kleikamp * remounting) the filesystem readonly, then we will end up with a 4161ac27a0ecSDave Kleikamp * consistent fs on disk. Record that fact. 4162ac27a0ecSDave Kleikamp */ 4163617ba13bSMingming Cao static void ext4_mark_recovery_complete(struct super_block *sb, 4164617ba13bSMingming Cao struct ext4_super_block *es) 4165ac27a0ecSDave Kleikamp { 4166617ba13bSMingming Cao journal_t *journal = EXT4_SB(sb)->s_journal; 4167ac27a0ecSDave Kleikamp 41680390131bSFrank Mayhar if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 41690390131bSFrank Mayhar BUG_ON(journal != NULL); 41700390131bSFrank Mayhar return; 41710390131bSFrank Mayhar } 4172dab291afSMingming Cao jbd2_journal_lock_updates(journal); 41737ffe1ea8SHidehiro Kawai if (jbd2_journal_flush(journal) < 0) 41747ffe1ea8SHidehiro Kawai goto out; 41757ffe1ea8SHidehiro Kawai 4176617ba13bSMingming Cao if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && 4177ac27a0ecSDave Kleikamp sb->s_flags & MS_RDONLY) { 4178617ba13bSMingming Cao EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 4179e2d67052STheodore Ts'o ext4_commit_super(sb, 1); 4180ac27a0ecSDave Kleikamp } 41817ffe1ea8SHidehiro Kawai 41827ffe1ea8SHidehiro Kawai out: 4183dab291afSMingming Cao jbd2_journal_unlock_updates(journal); 4184ac27a0ecSDave Kleikamp } 4185ac27a0ecSDave Kleikamp 4186ac27a0ecSDave Kleikamp /* 4187ac27a0ecSDave Kleikamp * If we are mounting (or read-write remounting) a filesystem whose journal 4188ac27a0ecSDave Kleikamp * has recorded an error from a previous lifetime, move that error to the 4189ac27a0ecSDave Kleikamp * main filesystem now. 4190ac27a0ecSDave Kleikamp */ 4191617ba13bSMingming Cao static void ext4_clear_journal_err(struct super_block *sb, 4192617ba13bSMingming Cao struct ext4_super_block *es) 4193ac27a0ecSDave Kleikamp { 4194ac27a0ecSDave Kleikamp journal_t *journal; 4195ac27a0ecSDave Kleikamp int j_errno; 4196ac27a0ecSDave Kleikamp const char *errstr; 4197ac27a0ecSDave Kleikamp 41980390131bSFrank Mayhar BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 41990390131bSFrank Mayhar 4200617ba13bSMingming Cao journal = EXT4_SB(sb)->s_journal; 4201ac27a0ecSDave Kleikamp 4202ac27a0ecSDave Kleikamp /* 4203ac27a0ecSDave Kleikamp * Now check for any error status which may have been recorded in the 4204617ba13bSMingming Cao * journal by a prior ext4_error() or ext4_abort() 4205ac27a0ecSDave Kleikamp */ 4206ac27a0ecSDave Kleikamp 4207dab291afSMingming Cao j_errno = jbd2_journal_errno(journal); 4208ac27a0ecSDave Kleikamp if (j_errno) { 4209ac27a0ecSDave Kleikamp char nbuf[16]; 4210ac27a0ecSDave Kleikamp 4211617ba13bSMingming Cao errstr = ext4_decode_error(sb, j_errno, nbuf); 421212062dddSEric Sandeen ext4_warning(sb, "Filesystem error recorded " 4213ac27a0ecSDave Kleikamp "from previous mount: %s", errstr); 421412062dddSEric Sandeen ext4_warning(sb, "Marking fs in need of filesystem check."); 4215ac27a0ecSDave Kleikamp 4216617ba13bSMingming Cao EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 4217617ba13bSMingming Cao es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 4218e2d67052STheodore Ts'o ext4_commit_super(sb, 1); 4219ac27a0ecSDave Kleikamp 4220dab291afSMingming Cao jbd2_journal_clear_err(journal); 4221ac27a0ecSDave Kleikamp } 4222ac27a0ecSDave Kleikamp } 4223ac27a0ecSDave Kleikamp 4224ac27a0ecSDave Kleikamp /* 4225ac27a0ecSDave Kleikamp * Force the running and committing transactions to commit, 4226ac27a0ecSDave Kleikamp * and wait on the commit. 4227ac27a0ecSDave Kleikamp */ 4228617ba13bSMingming Cao int ext4_force_commit(struct super_block *sb) 4229ac27a0ecSDave Kleikamp { 4230ac27a0ecSDave Kleikamp journal_t *journal; 42310390131bSFrank Mayhar int ret = 0; 4232ac27a0ecSDave Kleikamp 4233ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) 4234ac27a0ecSDave Kleikamp return 0; 4235ac27a0ecSDave Kleikamp 4236617ba13bSMingming Cao journal = EXT4_SB(sb)->s_journal; 42376b0310fbSEric Sandeen if (journal) { 4238437f88ccSEric Sandeen vfs_check_frozen(sb, SB_FREEZE_TRANS); 4239617ba13bSMingming Cao ret = ext4_journal_force_commit(journal); 42406b0310fbSEric Sandeen } 42410390131bSFrank Mayhar 4242ac27a0ecSDave Kleikamp return ret; 4243ac27a0ecSDave Kleikamp } 4244ac27a0ecSDave Kleikamp 4245617ba13bSMingming Cao static void ext4_write_super(struct super_block *sb) 4246ac27a0ecSDave Kleikamp { 4247ebc1ac16SChristoph Hellwig lock_super(sb); 4248e2d67052STheodore Ts'o ext4_commit_super(sb, 1); 4249ebc1ac16SChristoph Hellwig unlock_super(sb); 42500390131bSFrank Mayhar } 4251ac27a0ecSDave Kleikamp 4252617ba13bSMingming Cao static int ext4_sync_fs(struct super_block *sb, int wait) 4253ac27a0ecSDave Kleikamp { 425414ce0cb4STheodore Ts'o int ret = 0; 42559eddacf9SJan Kara tid_t target; 42568d5d02e6SMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 4257ac27a0ecSDave Kleikamp 42589bffad1eSTheodore Ts'o trace_ext4_sync_fs(sb, wait); 42598d5d02e6SMingming Cao flush_workqueue(sbi->dio_unwritten_wq); 42608d5d02e6SMingming Cao if (jbd2_journal_start_commit(sbi->s_journal, &target)) { 4261ac27a0ecSDave Kleikamp if (wait) 42628d5d02e6SMingming Cao jbd2_log_wait_commit(sbi->s_journal, target); 42630390131bSFrank Mayhar } 426414ce0cb4STheodore Ts'o return ret; 4265ac27a0ecSDave Kleikamp } 4266ac27a0ecSDave Kleikamp 4267ac27a0ecSDave Kleikamp /* 4268ac27a0ecSDave Kleikamp * LVM calls this function before a (read-only) snapshot is created. This 4269ac27a0ecSDave Kleikamp * gives us a chance to flush the journal completely and mark the fs clean. 4270be4f27d3SYongqiang Yang * 4271be4f27d3SYongqiang Yang * Note that only this function cannot bring a filesystem to be in a clean 4272be4f27d3SYongqiang Yang * state independently, because ext4 prevents a new handle from being started 4273be4f27d3SYongqiang Yang * by @sb->s_frozen, which stays in an upper layer. It thus needs help from 4274be4f27d3SYongqiang Yang * the upper layer. 4275ac27a0ecSDave Kleikamp */ 4276c4be0c1dSTakashi Sato static int ext4_freeze(struct super_block *sb) 4277ac27a0ecSDave Kleikamp { 4278c4be0c1dSTakashi Sato int error = 0; 4279c4be0c1dSTakashi Sato journal_t *journal; 4280ac27a0ecSDave Kleikamp 42819ca92389STheodore Ts'o if (sb->s_flags & MS_RDONLY) 42829ca92389STheodore Ts'o return 0; 42839ca92389STheodore Ts'o 4284c4be0c1dSTakashi Sato journal = EXT4_SB(sb)->s_journal; 4285ac27a0ecSDave Kleikamp 4286ac27a0ecSDave Kleikamp /* Now we set up the journal barrier. */ 4287dab291afSMingming Cao jbd2_journal_lock_updates(journal); 42887ffe1ea8SHidehiro Kawai 42897ffe1ea8SHidehiro Kawai /* 42909ca92389STheodore Ts'o * Don't clear the needs_recovery flag if we failed to flush 42919ca92389STheodore Ts'o * the journal. 42927ffe1ea8SHidehiro Kawai */ 4293c4be0c1dSTakashi Sato error = jbd2_journal_flush(journal); 42946b0310fbSEric Sandeen if (error < 0) 42956b0310fbSEric Sandeen goto out; 4296ac27a0ecSDave Kleikamp 4297ac27a0ecSDave Kleikamp /* Journal blocked and flushed, clear needs_recovery flag. */ 4298617ba13bSMingming Cao EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 4299e2d67052STheodore Ts'o error = ext4_commit_super(sb, 1); 43006b0310fbSEric Sandeen out: 43016b0310fbSEric Sandeen /* we rely on s_frozen to stop further updates */ 43026b0310fbSEric Sandeen jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 43036b0310fbSEric Sandeen return error; 4304ac27a0ecSDave Kleikamp } 4305ac27a0ecSDave Kleikamp 4306ac27a0ecSDave Kleikamp /* 4307ac27a0ecSDave Kleikamp * Called by LVM after the snapshot is done. We need to reset the RECOVER 4308ac27a0ecSDave Kleikamp * flag here, even though the filesystem is not technically dirty yet. 4309ac27a0ecSDave Kleikamp */ 4310c4be0c1dSTakashi Sato static int ext4_unfreeze(struct super_block *sb) 4311ac27a0ecSDave Kleikamp { 43129ca92389STheodore Ts'o if (sb->s_flags & MS_RDONLY) 43139ca92389STheodore Ts'o return 0; 43149ca92389STheodore Ts'o 4315ac27a0ecSDave Kleikamp lock_super(sb); 43169ca92389STheodore Ts'o /* Reset the needs_recovery flag before the fs is unlocked. */ 4317617ba13bSMingming Cao EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 4318e2d67052STheodore Ts'o ext4_commit_super(sb, 1); 4319ac27a0ecSDave Kleikamp unlock_super(sb); 4320c4be0c1dSTakashi Sato return 0; 4321ac27a0ecSDave Kleikamp } 4322ac27a0ecSDave Kleikamp 4323673c6100STheodore Ts'o /* 4324673c6100STheodore Ts'o * Structure to save mount options for ext4_remount's benefit 4325673c6100STheodore Ts'o */ 4326673c6100STheodore Ts'o struct ext4_mount_options { 4327673c6100STheodore Ts'o unsigned long s_mount_opt; 4328a2595b8aSTheodore Ts'o unsigned long s_mount_opt2; 4329673c6100STheodore Ts'o uid_t s_resuid; 4330673c6100STheodore Ts'o gid_t s_resgid; 4331673c6100STheodore Ts'o unsigned long s_commit_interval; 4332673c6100STheodore Ts'o u32 s_min_batch_time, s_max_batch_time; 4333673c6100STheodore Ts'o #ifdef CONFIG_QUOTA 4334673c6100STheodore Ts'o int s_jquota_fmt; 4335673c6100STheodore Ts'o char *s_qf_names[MAXQUOTAS]; 4336673c6100STheodore Ts'o #endif 4337673c6100STheodore Ts'o }; 4338673c6100STheodore Ts'o 4339617ba13bSMingming Cao static int ext4_remount(struct super_block *sb, int *flags, char *data) 4340ac27a0ecSDave Kleikamp { 4341617ba13bSMingming Cao struct ext4_super_block *es; 4342617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 4343ac27a0ecSDave Kleikamp unsigned long old_sb_flags; 4344617ba13bSMingming Cao struct ext4_mount_options old_opts; 4345c79d967dSChristoph Hellwig int enable_quota = 0; 43468a266467STheodore Ts'o ext4_group_t g; 4347b3881f74STheodore Ts'o unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; 4348c5e06d10SJohann Lombardi int err = 0; 4349ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 4350ac27a0ecSDave Kleikamp int i; 4351ac27a0ecSDave Kleikamp #endif 4352d4c402d9SCurt Wohlgemuth char *orig_data = kstrdup(data, GFP_KERNEL); 4353ac27a0ecSDave Kleikamp 4354ac27a0ecSDave Kleikamp /* Store the original options */ 4355bbd6851aSAl Viro lock_super(sb); 4356ac27a0ecSDave Kleikamp old_sb_flags = sb->s_flags; 4357ac27a0ecSDave Kleikamp old_opts.s_mount_opt = sbi->s_mount_opt; 4358a2595b8aSTheodore Ts'o old_opts.s_mount_opt2 = sbi->s_mount_opt2; 4359ac27a0ecSDave Kleikamp old_opts.s_resuid = sbi->s_resuid; 4360ac27a0ecSDave Kleikamp old_opts.s_resgid = sbi->s_resgid; 4361ac27a0ecSDave Kleikamp old_opts.s_commit_interval = sbi->s_commit_interval; 436230773840STheodore Ts'o old_opts.s_min_batch_time = sbi->s_min_batch_time; 436330773840STheodore Ts'o old_opts.s_max_batch_time = sbi->s_max_batch_time; 4364ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 4365ac27a0ecSDave Kleikamp old_opts.s_jquota_fmt = sbi->s_jquota_fmt; 4366ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) 4367ac27a0ecSDave Kleikamp old_opts.s_qf_names[i] = sbi->s_qf_names[i]; 4368ac27a0ecSDave Kleikamp #endif 4369b3881f74STheodore Ts'o if (sbi->s_journal && sbi->s_journal->j_task->io_context) 4370b3881f74STheodore Ts'o journal_ioprio = sbi->s_journal->j_task->io_context->ioprio; 4371ac27a0ecSDave Kleikamp 4372ac27a0ecSDave Kleikamp /* 4373ac27a0ecSDave Kleikamp * Allow the "check" option to be passed as a remount option. 4374ac27a0ecSDave Kleikamp */ 4375661aa520SEric Sandeen if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) { 4376ac27a0ecSDave Kleikamp err = -EINVAL; 4377ac27a0ecSDave Kleikamp goto restore_opts; 4378ac27a0ecSDave Kleikamp } 4379ac27a0ecSDave Kleikamp 43804ab2f15bSTheodore Ts'o if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) 4381c67d859eSTheodore Ts'o ext4_abort(sb, "Abort forced by user"); 4382ac27a0ecSDave Kleikamp 4383ac27a0ecSDave Kleikamp sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 4384482a7425SDmitry Monakhov (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); 4385ac27a0ecSDave Kleikamp 4386ac27a0ecSDave Kleikamp es = sbi->s_es; 4387ac27a0ecSDave Kleikamp 4388b3881f74STheodore Ts'o if (sbi->s_journal) { 4389617ba13bSMingming Cao ext4_init_journal_params(sb, sbi->s_journal); 4390b3881f74STheodore Ts'o set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); 4391b3881f74STheodore Ts'o } 4392ac27a0ecSDave Kleikamp 4393661aa520SEric Sandeen if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) { 43944ab2f15bSTheodore Ts'o if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) { 4395ac27a0ecSDave Kleikamp err = -EROFS; 4396ac27a0ecSDave Kleikamp goto restore_opts; 4397ac27a0ecSDave Kleikamp } 4398ac27a0ecSDave Kleikamp 4399ac27a0ecSDave Kleikamp if (*flags & MS_RDONLY) { 44000f0dd62fSChristoph Hellwig err = dquot_suspend(sb, -1); 44010f0dd62fSChristoph Hellwig if (err < 0) 4402c79d967dSChristoph Hellwig goto restore_opts; 4403c79d967dSChristoph Hellwig 4404ac27a0ecSDave Kleikamp /* 4405ac27a0ecSDave Kleikamp * First of all, the unconditional stuff we have to do 4406ac27a0ecSDave Kleikamp * to disable replay of the journal when we next remount 4407ac27a0ecSDave Kleikamp */ 4408ac27a0ecSDave Kleikamp sb->s_flags |= MS_RDONLY; 4409ac27a0ecSDave Kleikamp 4410ac27a0ecSDave Kleikamp /* 4411ac27a0ecSDave Kleikamp * OK, test if we are remounting a valid rw partition 4412ac27a0ecSDave Kleikamp * readonly, and if so set the rdonly flag and then 4413ac27a0ecSDave Kleikamp * mark the partition as valid again. 4414ac27a0ecSDave Kleikamp */ 4415617ba13bSMingming Cao if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && 4416617ba13bSMingming Cao (sbi->s_mount_state & EXT4_VALID_FS)) 4417ac27a0ecSDave Kleikamp es->s_state = cpu_to_le16(sbi->s_mount_state); 4418ac27a0ecSDave Kleikamp 4419a63c9eb2STheodore Ts'o if (sbi->s_journal) 4420617ba13bSMingming Cao ext4_mark_recovery_complete(sb, es); 4421ac27a0ecSDave Kleikamp } else { 4422a13fb1a4SEric Sandeen /* Make sure we can mount this feature set readwrite */ 4423a13fb1a4SEric Sandeen if (!ext4_feature_set_ok(sb, 0)) { 4424ac27a0ecSDave Kleikamp err = -EROFS; 4425ac27a0ecSDave Kleikamp goto restore_opts; 4426ac27a0ecSDave Kleikamp } 4427ead6596bSEric Sandeen /* 44288a266467STheodore Ts'o * Make sure the group descriptor checksums 44290b8e58a1SAndreas Dilger * are sane. If they aren't, refuse to remount r/w. 44308a266467STheodore Ts'o */ 44318a266467STheodore Ts'o for (g = 0; g < sbi->s_groups_count; g++) { 44328a266467STheodore Ts'o struct ext4_group_desc *gdp = 44338a266467STheodore Ts'o ext4_get_group_desc(sb, g, NULL); 44348a266467STheodore Ts'o 44358a266467STheodore Ts'o if (!ext4_group_desc_csum_verify(sbi, g, gdp)) { 4436b31e1552SEric Sandeen ext4_msg(sb, KERN_ERR, 4437b31e1552SEric Sandeen "ext4_remount: Checksum for group %u failed (%u!=%u)", 44388a266467STheodore Ts'o g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)), 44398a266467STheodore Ts'o le16_to_cpu(gdp->bg_checksum)); 44408a266467STheodore Ts'o err = -EINVAL; 44418a266467STheodore Ts'o goto restore_opts; 44428a266467STheodore Ts'o } 44438a266467STheodore Ts'o } 44448a266467STheodore Ts'o 44458a266467STheodore Ts'o /* 4446ead6596bSEric Sandeen * If we have an unprocessed orphan list hanging 4447ead6596bSEric Sandeen * around from a previously readonly bdev mount, 4448ead6596bSEric Sandeen * require a full umount/remount for now. 4449ead6596bSEric Sandeen */ 4450ead6596bSEric Sandeen if (es->s_last_orphan) { 4451b31e1552SEric Sandeen ext4_msg(sb, KERN_WARNING, "Couldn't " 4452ead6596bSEric Sandeen "remount RDWR because of unprocessed " 4453ead6596bSEric Sandeen "orphan inode list. Please " 4454b31e1552SEric Sandeen "umount/remount instead"); 4455ead6596bSEric Sandeen err = -EINVAL; 4456ead6596bSEric Sandeen goto restore_opts; 4457ead6596bSEric Sandeen } 4458ead6596bSEric Sandeen 4459ac27a0ecSDave Kleikamp /* 4460ac27a0ecSDave Kleikamp * Mounting a RDONLY partition read-write, so reread 4461ac27a0ecSDave Kleikamp * and store the current valid flag. (It may have 4462ac27a0ecSDave Kleikamp * been changed by e2fsck since we originally mounted 4463ac27a0ecSDave Kleikamp * the partition.) 4464ac27a0ecSDave Kleikamp */ 44650390131bSFrank Mayhar if (sbi->s_journal) 4466617ba13bSMingming Cao ext4_clear_journal_err(sb, es); 4467ac27a0ecSDave Kleikamp sbi->s_mount_state = le16_to_cpu(es->s_state); 4468617ba13bSMingming Cao if (!ext4_setup_super(sb, es, 0)) 4469ac27a0ecSDave Kleikamp sb->s_flags &= ~MS_RDONLY; 4470c5e06d10SJohann Lombardi if (EXT4_HAS_INCOMPAT_FEATURE(sb, 4471c5e06d10SJohann Lombardi EXT4_FEATURE_INCOMPAT_MMP)) 4472c5e06d10SJohann Lombardi if (ext4_multi_mount_protect(sb, 4473c5e06d10SJohann Lombardi le64_to_cpu(es->s_mmp_block))) { 4474c5e06d10SJohann Lombardi err = -EROFS; 4475c5e06d10SJohann Lombardi goto restore_opts; 4476c5e06d10SJohann Lombardi } 4477c79d967dSChristoph Hellwig enable_quota = 1; 4478ac27a0ecSDave Kleikamp } 4479ac27a0ecSDave Kleikamp } 4480bfff6873SLukas Czerner 4481bfff6873SLukas Czerner /* 4482bfff6873SLukas Czerner * Reinitialize lazy itable initialization thread based on 4483bfff6873SLukas Czerner * current settings 4484bfff6873SLukas Czerner */ 4485bfff6873SLukas Czerner if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE)) 4486bfff6873SLukas Czerner ext4_unregister_li_request(sb); 4487bfff6873SLukas Czerner else { 4488bfff6873SLukas Czerner ext4_group_t first_not_zeroed; 4489bfff6873SLukas Czerner first_not_zeroed = ext4_has_uninit_itable(sb); 4490bfff6873SLukas Czerner ext4_register_li_request(sb, first_not_zeroed); 4491bfff6873SLukas Czerner } 4492bfff6873SLukas Czerner 44936fd058f7STheodore Ts'o ext4_setup_system_zone(sb); 44940390131bSFrank Mayhar if (sbi->s_journal == NULL) 4495e2d67052STheodore Ts'o ext4_commit_super(sb, 1); 44960390131bSFrank Mayhar 4497ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 4498ac27a0ecSDave Kleikamp /* Release old quota file names */ 4499ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) 4500ac27a0ecSDave Kleikamp if (old_opts.s_qf_names[i] && 4501ac27a0ecSDave Kleikamp old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 4502ac27a0ecSDave Kleikamp kfree(old_opts.s_qf_names[i]); 4503ac27a0ecSDave Kleikamp #endif 4504bbd6851aSAl Viro unlock_super(sb); 4505c79d967dSChristoph Hellwig if (enable_quota) 45060f0dd62fSChristoph Hellwig dquot_resume(sb, -1); 4507d4c402d9SCurt Wohlgemuth 4508d4c402d9SCurt Wohlgemuth ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data); 4509d4c402d9SCurt Wohlgemuth kfree(orig_data); 4510ac27a0ecSDave Kleikamp return 0; 45110b8e58a1SAndreas Dilger 4512ac27a0ecSDave Kleikamp restore_opts: 4513ac27a0ecSDave Kleikamp sb->s_flags = old_sb_flags; 4514ac27a0ecSDave Kleikamp sbi->s_mount_opt = old_opts.s_mount_opt; 4515a2595b8aSTheodore Ts'o sbi->s_mount_opt2 = old_opts.s_mount_opt2; 4516ac27a0ecSDave Kleikamp sbi->s_resuid = old_opts.s_resuid; 4517ac27a0ecSDave Kleikamp sbi->s_resgid = old_opts.s_resgid; 4518ac27a0ecSDave Kleikamp sbi->s_commit_interval = old_opts.s_commit_interval; 451930773840STheodore Ts'o sbi->s_min_batch_time = old_opts.s_min_batch_time; 452030773840STheodore Ts'o sbi->s_max_batch_time = old_opts.s_max_batch_time; 4521ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 4522ac27a0ecSDave Kleikamp sbi->s_jquota_fmt = old_opts.s_jquota_fmt; 4523ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) { 4524ac27a0ecSDave Kleikamp if (sbi->s_qf_names[i] && 4525ac27a0ecSDave Kleikamp old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 4526ac27a0ecSDave Kleikamp kfree(sbi->s_qf_names[i]); 4527ac27a0ecSDave Kleikamp sbi->s_qf_names[i] = old_opts.s_qf_names[i]; 4528ac27a0ecSDave Kleikamp } 4529ac27a0ecSDave Kleikamp #endif 4530bbd6851aSAl Viro unlock_super(sb); 4531d4c402d9SCurt Wohlgemuth kfree(orig_data); 4532ac27a0ecSDave Kleikamp return err; 4533ac27a0ecSDave Kleikamp } 4534ac27a0ecSDave Kleikamp 4535f975d6bcSTheodore Ts'o /* 4536f975d6bcSTheodore Ts'o * Note: calculating the overhead so we can be compatible with 4537f975d6bcSTheodore Ts'o * historical BSD practice is quite difficult in the face of 4538f975d6bcSTheodore Ts'o * clusters/bigalloc. This is because multiple metadata blocks from 4539f975d6bcSTheodore Ts'o * different block group can end up in the same allocation cluster. 4540f975d6bcSTheodore Ts'o * Calculating the exact overhead in the face of clustered allocation 4541f975d6bcSTheodore Ts'o * requires either O(all block bitmaps) in memory or O(number of block 4542f975d6bcSTheodore Ts'o * groups**2) in time. We will still calculate the superblock for 4543f975d6bcSTheodore Ts'o * older file systems --- and if we come across with a bigalloc file 4544f975d6bcSTheodore Ts'o * system with zero in s_overhead_clusters the estimate will be close to 4545f975d6bcSTheodore Ts'o * correct especially for very large cluster sizes --- but for newer 4546f975d6bcSTheodore Ts'o * file systems, it's better to calculate this figure once at mkfs 4547f975d6bcSTheodore Ts'o * time, and store it in the superblock. If the superblock value is 4548f975d6bcSTheodore Ts'o * present (even for non-bigalloc file systems), we will use it. 4549f975d6bcSTheodore Ts'o */ 4550617ba13bSMingming Cao static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf) 4551ac27a0ecSDave Kleikamp { 4552ac27a0ecSDave Kleikamp struct super_block *sb = dentry->d_sb; 4553617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 4554617ba13bSMingming Cao struct ext4_super_block *es = sbi->s_es; 4555f975d6bcSTheodore Ts'o struct ext4_group_desc *gdp; 4556960cc398SPekka Enberg u64 fsid; 4557d02a9391SKazuya Mio s64 bfree; 4558ac27a0ecSDave Kleikamp 45595e70030dSBadari Pulavarty if (test_opt(sb, MINIX_DF)) { 45605e70030dSBadari Pulavarty sbi->s_overhead_last = 0; 4561f975d6bcSTheodore Ts'o } else if (es->s_overhead_clusters) { 4562f975d6bcSTheodore Ts'o sbi->s_overhead_last = le32_to_cpu(es->s_overhead_clusters); 45636bc9feffSAneesh Kumar K.V } else if (sbi->s_blocks_last != ext4_blocks_count(es)) { 45648df9675fSTheodore Ts'o ext4_group_t i, ngroups = ext4_get_groups_count(sb); 45655e70030dSBadari Pulavarty ext4_fsblk_t overhead = 0; 4566ac27a0ecSDave Kleikamp 4567ac27a0ecSDave Kleikamp /* 45685e70030dSBadari Pulavarty * Compute the overhead (FS structures). This is constant 45695e70030dSBadari Pulavarty * for a given filesystem unless the number of block groups 45705e70030dSBadari Pulavarty * changes so we cache the previous value until it does. 4571ac27a0ecSDave Kleikamp */ 4572ac27a0ecSDave Kleikamp 4573ac27a0ecSDave Kleikamp /* 4574ac27a0ecSDave Kleikamp * All of the blocks before first_data_block are 4575ac27a0ecSDave Kleikamp * overhead 4576ac27a0ecSDave Kleikamp */ 4577f975d6bcSTheodore Ts'o overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block)); 4578ac27a0ecSDave Kleikamp 4579ac27a0ecSDave Kleikamp /* 4580f975d6bcSTheodore Ts'o * Add the overhead found in each block group 4581ac27a0ecSDave Kleikamp */ 4582ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 4583f975d6bcSTheodore Ts'o gdp = ext4_get_group_desc(sb, i, NULL); 4584f975d6bcSTheodore Ts'o overhead += ext4_num_overhead_clusters(sb, i, gdp); 4585ac27a0ecSDave Kleikamp cond_resched(); 4586ac27a0ecSDave Kleikamp } 45875e70030dSBadari Pulavarty sbi->s_overhead_last = overhead; 45885e70030dSBadari Pulavarty smp_wmb(); 45896bc9feffSAneesh Kumar K.V sbi->s_blocks_last = ext4_blocks_count(es); 4590ac27a0ecSDave Kleikamp } 4591ac27a0ecSDave Kleikamp 4592617ba13bSMingming Cao buf->f_type = EXT4_SUPER_MAGIC; 4593ac27a0ecSDave Kleikamp buf->f_bsize = sb->s_blocksize; 4594f975d6bcSTheodore Ts'o buf->f_blocks = (ext4_blocks_count(es) - 4595f975d6bcSTheodore Ts'o EXT4_C2B(sbi, sbi->s_overhead_last)); 459657042651STheodore Ts'o bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) - 459757042651STheodore Ts'o percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter); 4598d02a9391SKazuya Mio /* prevent underflow in case that few free space is available */ 459957042651STheodore Ts'o buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0)); 4600bd81d8eeSLaurent Vivier buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); 4601bd81d8eeSLaurent Vivier if (buf->f_bfree < ext4_r_blocks_count(es)) 4602ac27a0ecSDave Kleikamp buf->f_bavail = 0; 4603ac27a0ecSDave Kleikamp buf->f_files = le32_to_cpu(es->s_inodes_count); 460452d9f3b4SPeter Zijlstra buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); 4605617ba13bSMingming Cao buf->f_namelen = EXT4_NAME_LEN; 4606960cc398SPekka Enberg fsid = le64_to_cpup((void *)es->s_uuid) ^ 4607960cc398SPekka Enberg le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 4608960cc398SPekka Enberg buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 4609960cc398SPekka Enberg buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 46100b8e58a1SAndreas Dilger 4611ac27a0ecSDave Kleikamp return 0; 4612ac27a0ecSDave Kleikamp } 4613ac27a0ecSDave Kleikamp 46140b8e58a1SAndreas Dilger /* Helper function for writing quotas on sync - we need to start transaction 46150b8e58a1SAndreas Dilger * before quota file is locked for write. Otherwise the are possible deadlocks: 4616ac27a0ecSDave Kleikamp * Process 1 Process 2 4617617ba13bSMingming Cao * ext4_create() quota_sync() 4618dab291afSMingming Cao * jbd2_journal_start() write_dquot() 4619871a2931SChristoph Hellwig * dquot_initialize() down(dqio_mutex) 4620dab291afSMingming Cao * down(dqio_mutex) jbd2_journal_start() 4621ac27a0ecSDave Kleikamp * 4622ac27a0ecSDave Kleikamp */ 4623ac27a0ecSDave Kleikamp 4624ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 4625ac27a0ecSDave Kleikamp 4626ac27a0ecSDave Kleikamp static inline struct inode *dquot_to_inode(struct dquot *dquot) 4627ac27a0ecSDave Kleikamp { 4628ac27a0ecSDave Kleikamp return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; 4629ac27a0ecSDave Kleikamp } 4630ac27a0ecSDave Kleikamp 4631617ba13bSMingming Cao static int ext4_write_dquot(struct dquot *dquot) 4632ac27a0ecSDave Kleikamp { 4633ac27a0ecSDave Kleikamp int ret, err; 4634ac27a0ecSDave Kleikamp handle_t *handle; 4635ac27a0ecSDave Kleikamp struct inode *inode; 4636ac27a0ecSDave Kleikamp 4637ac27a0ecSDave Kleikamp inode = dquot_to_inode(dquot); 4638617ba13bSMingming Cao handle = ext4_journal_start(inode, 4639617ba13bSMingming Cao EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 4640ac27a0ecSDave Kleikamp if (IS_ERR(handle)) 4641ac27a0ecSDave Kleikamp return PTR_ERR(handle); 4642ac27a0ecSDave Kleikamp ret = dquot_commit(dquot); 4643617ba13bSMingming Cao err = ext4_journal_stop(handle); 4644ac27a0ecSDave Kleikamp if (!ret) 4645ac27a0ecSDave Kleikamp ret = err; 4646ac27a0ecSDave Kleikamp return ret; 4647ac27a0ecSDave Kleikamp } 4648ac27a0ecSDave Kleikamp 4649617ba13bSMingming Cao static int ext4_acquire_dquot(struct dquot *dquot) 4650ac27a0ecSDave Kleikamp { 4651ac27a0ecSDave Kleikamp int ret, err; 4652ac27a0ecSDave Kleikamp handle_t *handle; 4653ac27a0ecSDave Kleikamp 4654617ba13bSMingming Cao handle = ext4_journal_start(dquot_to_inode(dquot), 4655617ba13bSMingming Cao EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 4656ac27a0ecSDave Kleikamp if (IS_ERR(handle)) 4657ac27a0ecSDave Kleikamp return PTR_ERR(handle); 4658ac27a0ecSDave Kleikamp ret = dquot_acquire(dquot); 4659617ba13bSMingming Cao err = ext4_journal_stop(handle); 4660ac27a0ecSDave Kleikamp if (!ret) 4661ac27a0ecSDave Kleikamp ret = err; 4662ac27a0ecSDave Kleikamp return ret; 4663ac27a0ecSDave Kleikamp } 4664ac27a0ecSDave Kleikamp 4665617ba13bSMingming Cao static int ext4_release_dquot(struct dquot *dquot) 4666ac27a0ecSDave Kleikamp { 4667ac27a0ecSDave Kleikamp int ret, err; 4668ac27a0ecSDave Kleikamp handle_t *handle; 4669ac27a0ecSDave Kleikamp 4670617ba13bSMingming Cao handle = ext4_journal_start(dquot_to_inode(dquot), 4671617ba13bSMingming Cao EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 46729c3013e9SJan Kara if (IS_ERR(handle)) { 46739c3013e9SJan Kara /* Release dquot anyway to avoid endless cycle in dqput() */ 46749c3013e9SJan Kara dquot_release(dquot); 4675ac27a0ecSDave Kleikamp return PTR_ERR(handle); 46769c3013e9SJan Kara } 4677ac27a0ecSDave Kleikamp ret = dquot_release(dquot); 4678617ba13bSMingming Cao err = ext4_journal_stop(handle); 4679ac27a0ecSDave Kleikamp if (!ret) 4680ac27a0ecSDave Kleikamp ret = err; 4681ac27a0ecSDave Kleikamp return ret; 4682ac27a0ecSDave Kleikamp } 4683ac27a0ecSDave Kleikamp 4684617ba13bSMingming Cao static int ext4_mark_dquot_dirty(struct dquot *dquot) 4685ac27a0ecSDave Kleikamp { 46862c8be6b2SJan Kara /* Are we journaling quotas? */ 4687617ba13bSMingming Cao if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || 4688617ba13bSMingming Cao EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { 4689ac27a0ecSDave Kleikamp dquot_mark_dquot_dirty(dquot); 4690617ba13bSMingming Cao return ext4_write_dquot(dquot); 4691ac27a0ecSDave Kleikamp } else { 4692ac27a0ecSDave Kleikamp return dquot_mark_dquot_dirty(dquot); 4693ac27a0ecSDave Kleikamp } 4694ac27a0ecSDave Kleikamp } 4695ac27a0ecSDave Kleikamp 4696617ba13bSMingming Cao static int ext4_write_info(struct super_block *sb, int type) 4697ac27a0ecSDave Kleikamp { 4698ac27a0ecSDave Kleikamp int ret, err; 4699ac27a0ecSDave Kleikamp handle_t *handle; 4700ac27a0ecSDave Kleikamp 4701ac27a0ecSDave Kleikamp /* Data block + inode block */ 4702617ba13bSMingming Cao handle = ext4_journal_start(sb->s_root->d_inode, 2); 4703ac27a0ecSDave Kleikamp if (IS_ERR(handle)) 4704ac27a0ecSDave Kleikamp return PTR_ERR(handle); 4705ac27a0ecSDave Kleikamp ret = dquot_commit_info(sb, type); 4706617ba13bSMingming Cao err = ext4_journal_stop(handle); 4707ac27a0ecSDave Kleikamp if (!ret) 4708ac27a0ecSDave Kleikamp ret = err; 4709ac27a0ecSDave Kleikamp return ret; 4710ac27a0ecSDave Kleikamp } 4711ac27a0ecSDave Kleikamp 4712ac27a0ecSDave Kleikamp /* 4713ac27a0ecSDave Kleikamp * Turn on quotas during mount time - we need to find 4714ac27a0ecSDave Kleikamp * the quota file and such... 4715ac27a0ecSDave Kleikamp */ 4716617ba13bSMingming Cao static int ext4_quota_on_mount(struct super_block *sb, int type) 4717ac27a0ecSDave Kleikamp { 4718287a8095SChristoph Hellwig return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], 4719617ba13bSMingming Cao EXT4_SB(sb)->s_jquota_fmt, type); 4720ac27a0ecSDave Kleikamp } 4721ac27a0ecSDave Kleikamp 4722ac27a0ecSDave Kleikamp /* 4723ac27a0ecSDave Kleikamp * Standard function to be called on quota_on 4724ac27a0ecSDave Kleikamp */ 4725617ba13bSMingming Cao static int ext4_quota_on(struct super_block *sb, int type, int format_id, 4726f00c9e44SJan Kara struct path *path) 4727ac27a0ecSDave Kleikamp { 4728ac27a0ecSDave Kleikamp int err; 4729ac27a0ecSDave Kleikamp 4730ac27a0ecSDave Kleikamp if (!test_opt(sb, QUOTA)) 4731ac27a0ecSDave Kleikamp return -EINVAL; 47320623543bSJan Kara 4733ac27a0ecSDave Kleikamp /* Quotafile not on the same filesystem? */ 4734d8c9584eSAl Viro if (path->dentry->d_sb != sb) 4735ac27a0ecSDave Kleikamp return -EXDEV; 47360623543bSJan Kara /* Journaling quota? */ 47370623543bSJan Kara if (EXT4_SB(sb)->s_qf_names[type]) { 47382b2d6d01STheodore Ts'o /* Quotafile not in fs root? */ 4739f00c9e44SJan Kara if (path->dentry->d_parent != sb->s_root) 4740b31e1552SEric Sandeen ext4_msg(sb, KERN_WARNING, 4741b31e1552SEric Sandeen "Quota file not on filesystem root. " 4742b31e1552SEric Sandeen "Journaled quota will not work"); 47430623543bSJan Kara } 47440623543bSJan Kara 47450623543bSJan Kara /* 47460623543bSJan Kara * When we journal data on quota file, we have to flush journal to see 47470623543bSJan Kara * all updates to the file when we bypass pagecache... 47480623543bSJan Kara */ 47490390131bSFrank Mayhar if (EXT4_SB(sb)->s_journal && 4750f00c9e44SJan Kara ext4_should_journal_data(path->dentry->d_inode)) { 47510623543bSJan Kara /* 47520623543bSJan Kara * We don't need to lock updates but journal_flush() could 47530623543bSJan Kara * otherwise be livelocked... 47540623543bSJan Kara */ 47550623543bSJan Kara jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 47567ffe1ea8SHidehiro Kawai err = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 47570623543bSJan Kara jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 4758f00c9e44SJan Kara if (err) 47597ffe1ea8SHidehiro Kawai return err; 47607ffe1ea8SHidehiro Kawai } 47610623543bSJan Kara 4762f00c9e44SJan Kara return dquot_quota_on(sb, type, format_id, path); 4763ac27a0ecSDave Kleikamp } 4764ac27a0ecSDave Kleikamp 4765ca0e05e4SDmitry Monakhov static int ext4_quota_off(struct super_block *sb, int type) 4766ca0e05e4SDmitry Monakhov { 476721f97697SJan Kara struct inode *inode = sb_dqopt(sb)->files[type]; 476821f97697SJan Kara handle_t *handle; 476921f97697SJan Kara 477087009d86SDmitry Monakhov /* Force all delayed allocation blocks to be allocated. 477187009d86SDmitry Monakhov * Caller already holds s_umount sem */ 477287009d86SDmitry Monakhov if (test_opt(sb, DELALLOC)) 4773ca0e05e4SDmitry Monakhov sync_filesystem(sb); 4774ca0e05e4SDmitry Monakhov 47750b268590SAmir Goldstein if (!inode) 47760b268590SAmir Goldstein goto out; 47770b268590SAmir Goldstein 477821f97697SJan Kara /* Update modification times of quota files when userspace can 477921f97697SJan Kara * start looking at them */ 478021f97697SJan Kara handle = ext4_journal_start(inode, 1); 478121f97697SJan Kara if (IS_ERR(handle)) 478221f97697SJan Kara goto out; 478321f97697SJan Kara inode->i_mtime = inode->i_ctime = CURRENT_TIME; 478421f97697SJan Kara ext4_mark_inode_dirty(handle, inode); 478521f97697SJan Kara ext4_journal_stop(handle); 478621f97697SJan Kara 478721f97697SJan Kara out: 4788ca0e05e4SDmitry Monakhov return dquot_quota_off(sb, type); 4789ca0e05e4SDmitry Monakhov } 4790ca0e05e4SDmitry Monakhov 4791ac27a0ecSDave Kleikamp /* Read data from quotafile - avoid pagecache and such because we cannot afford 4792ac27a0ecSDave Kleikamp * acquiring the locks... As quota files are never truncated and quota code 4793ac27a0ecSDave Kleikamp * itself serializes the operations (and no one else should touch the files) 4794ac27a0ecSDave Kleikamp * we don't have to be afraid of races */ 4795617ba13bSMingming Cao static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 4796ac27a0ecSDave Kleikamp size_t len, loff_t off) 4797ac27a0ecSDave Kleikamp { 4798ac27a0ecSDave Kleikamp struct inode *inode = sb_dqopt(sb)->files[type]; 4799725d26d3SAneesh Kumar K.V ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 4800ac27a0ecSDave Kleikamp int err = 0; 4801ac27a0ecSDave Kleikamp int offset = off & (sb->s_blocksize - 1); 4802ac27a0ecSDave Kleikamp int tocopy; 4803ac27a0ecSDave Kleikamp size_t toread; 4804ac27a0ecSDave Kleikamp struct buffer_head *bh; 4805ac27a0ecSDave Kleikamp loff_t i_size = i_size_read(inode); 4806ac27a0ecSDave Kleikamp 4807ac27a0ecSDave Kleikamp if (off > i_size) 4808ac27a0ecSDave Kleikamp return 0; 4809ac27a0ecSDave Kleikamp if (off+len > i_size) 4810ac27a0ecSDave Kleikamp len = i_size-off; 4811ac27a0ecSDave Kleikamp toread = len; 4812ac27a0ecSDave Kleikamp while (toread > 0) { 4813ac27a0ecSDave Kleikamp tocopy = sb->s_blocksize - offset < toread ? 4814ac27a0ecSDave Kleikamp sb->s_blocksize - offset : toread; 4815617ba13bSMingming Cao bh = ext4_bread(NULL, inode, blk, 0, &err); 4816ac27a0ecSDave Kleikamp if (err) 4817ac27a0ecSDave Kleikamp return err; 4818ac27a0ecSDave Kleikamp if (!bh) /* A hole? */ 4819ac27a0ecSDave Kleikamp memset(data, 0, tocopy); 4820ac27a0ecSDave Kleikamp else 4821ac27a0ecSDave Kleikamp memcpy(data, bh->b_data+offset, tocopy); 4822ac27a0ecSDave Kleikamp brelse(bh); 4823ac27a0ecSDave Kleikamp offset = 0; 4824ac27a0ecSDave Kleikamp toread -= tocopy; 4825ac27a0ecSDave Kleikamp data += tocopy; 4826ac27a0ecSDave Kleikamp blk++; 4827ac27a0ecSDave Kleikamp } 4828ac27a0ecSDave Kleikamp return len; 4829ac27a0ecSDave Kleikamp } 4830ac27a0ecSDave Kleikamp 4831ac27a0ecSDave Kleikamp /* Write to quotafile (we know the transaction is already started and has 4832ac27a0ecSDave Kleikamp * enough credits) */ 4833617ba13bSMingming Cao static ssize_t ext4_quota_write(struct super_block *sb, int type, 4834ac27a0ecSDave Kleikamp const char *data, size_t len, loff_t off) 4835ac27a0ecSDave Kleikamp { 4836ac27a0ecSDave Kleikamp struct inode *inode = sb_dqopt(sb)->files[type]; 4837725d26d3SAneesh Kumar K.V ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 4838ac27a0ecSDave Kleikamp int err = 0; 4839ac27a0ecSDave Kleikamp int offset = off & (sb->s_blocksize - 1); 4840ac27a0ecSDave Kleikamp struct buffer_head *bh; 4841ac27a0ecSDave Kleikamp handle_t *handle = journal_current_handle(); 4842ac27a0ecSDave Kleikamp 48430390131bSFrank Mayhar if (EXT4_SB(sb)->s_journal && !handle) { 4844b31e1552SEric Sandeen ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" 4845b31e1552SEric Sandeen " cancelled because transaction is not started", 48469c3013e9SJan Kara (unsigned long long)off, (unsigned long long)len); 48479c3013e9SJan Kara return -EIO; 48489c3013e9SJan Kara } 484967eeb568SDmitry Monakhov /* 485067eeb568SDmitry Monakhov * Since we account only one data block in transaction credits, 485167eeb568SDmitry Monakhov * then it is impossible to cross a block boundary. 485267eeb568SDmitry Monakhov */ 485367eeb568SDmitry Monakhov if (sb->s_blocksize - offset < len) { 485467eeb568SDmitry Monakhov ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" 485567eeb568SDmitry Monakhov " cancelled because not block aligned", 485667eeb568SDmitry Monakhov (unsigned long long)off, (unsigned long long)len); 485767eeb568SDmitry Monakhov return -EIO; 485867eeb568SDmitry Monakhov } 485967eeb568SDmitry Monakhov 4860ac27a0ecSDave Kleikamp mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 4861617ba13bSMingming Cao bh = ext4_bread(handle, inode, blk, 1, &err); 4862ac27a0ecSDave Kleikamp if (!bh) 4863ac27a0ecSDave Kleikamp goto out; 4864617ba13bSMingming Cao err = ext4_journal_get_write_access(handle, bh); 4865ac27a0ecSDave Kleikamp if (err) { 4866ac27a0ecSDave Kleikamp brelse(bh); 4867ac27a0ecSDave Kleikamp goto out; 4868ac27a0ecSDave Kleikamp } 4869ac27a0ecSDave Kleikamp lock_buffer(bh); 487067eeb568SDmitry Monakhov memcpy(bh->b_data+offset, data, len); 4871ac27a0ecSDave Kleikamp flush_dcache_page(bh->b_page); 4872ac27a0ecSDave Kleikamp unlock_buffer(bh); 48730390131bSFrank Mayhar err = ext4_handle_dirty_metadata(handle, NULL, bh); 4874ac27a0ecSDave Kleikamp brelse(bh); 4875ac27a0ecSDave Kleikamp out: 487667eeb568SDmitry Monakhov if (err) { 48774d04e4fbSJan Kara mutex_unlock(&inode->i_mutex); 4878ac27a0ecSDave Kleikamp return err; 48794d04e4fbSJan Kara } 488067eeb568SDmitry Monakhov if (inode->i_size < off + len) { 488167eeb568SDmitry Monakhov i_size_write(inode, off + len); 4882617ba13bSMingming Cao EXT4_I(inode)->i_disksize = inode->i_size; 4883617ba13bSMingming Cao ext4_mark_inode_dirty(handle, inode); 488421f97697SJan Kara } 4885ac27a0ecSDave Kleikamp mutex_unlock(&inode->i_mutex); 488667eeb568SDmitry Monakhov return len; 4887ac27a0ecSDave Kleikamp } 4888ac27a0ecSDave Kleikamp 4889ac27a0ecSDave Kleikamp #endif 4890ac27a0ecSDave Kleikamp 4891152a0836SAl Viro static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags, 4892152a0836SAl Viro const char *dev_name, void *data) 4893ac27a0ecSDave Kleikamp { 4894152a0836SAl Viro return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super); 4895ac27a0ecSDave Kleikamp } 4896ac27a0ecSDave Kleikamp 489737f328ebSTheodore Ts'o #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) 489824b58424STheodore Ts'o static inline void register_as_ext2(void) 489924b58424STheodore Ts'o { 490024b58424STheodore Ts'o int err = register_filesystem(&ext2_fs_type); 490124b58424STheodore Ts'o if (err) 490224b58424STheodore Ts'o printk(KERN_WARNING 490324b58424STheodore Ts'o "EXT4-fs: Unable to register as ext2 (%d)\n", err); 490424b58424STheodore Ts'o } 490524b58424STheodore Ts'o 490624b58424STheodore Ts'o static inline void unregister_as_ext2(void) 490724b58424STheodore Ts'o { 490824b58424STheodore Ts'o unregister_filesystem(&ext2_fs_type); 490924b58424STheodore Ts'o } 49102035e776STheodore Ts'o 49112035e776STheodore Ts'o static inline int ext2_feature_set_ok(struct super_block *sb) 49122035e776STheodore Ts'o { 49132035e776STheodore Ts'o if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP)) 49142035e776STheodore Ts'o return 0; 49152035e776STheodore Ts'o if (sb->s_flags & MS_RDONLY) 49162035e776STheodore Ts'o return 1; 49172035e776STheodore Ts'o if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP)) 49182035e776STheodore Ts'o return 0; 49192035e776STheodore Ts'o return 1; 49202035e776STheodore Ts'o } 492151b7e3c9STheodore Ts'o MODULE_ALIAS("ext2"); 492224b58424STheodore Ts'o #else 492324b58424STheodore Ts'o static inline void register_as_ext2(void) { } 492424b58424STheodore Ts'o static inline void unregister_as_ext2(void) { } 49252035e776STheodore Ts'o static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; } 492624b58424STheodore Ts'o #endif 492724b58424STheodore Ts'o 492837f328ebSTheodore Ts'o #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) 492924b58424STheodore Ts'o static inline void register_as_ext3(void) 493024b58424STheodore Ts'o { 493124b58424STheodore Ts'o int err = register_filesystem(&ext3_fs_type); 493224b58424STheodore Ts'o if (err) 493324b58424STheodore Ts'o printk(KERN_WARNING 493424b58424STheodore Ts'o "EXT4-fs: Unable to register as ext3 (%d)\n", err); 493524b58424STheodore Ts'o } 493624b58424STheodore Ts'o 493724b58424STheodore Ts'o static inline void unregister_as_ext3(void) 493824b58424STheodore Ts'o { 493924b58424STheodore Ts'o unregister_filesystem(&ext3_fs_type); 494024b58424STheodore Ts'o } 49412035e776STheodore Ts'o 49422035e776STheodore Ts'o static inline int ext3_feature_set_ok(struct super_block *sb) 49432035e776STheodore Ts'o { 49442035e776STheodore Ts'o if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP)) 49452035e776STheodore Ts'o return 0; 49462035e776STheodore Ts'o if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) 49472035e776STheodore Ts'o return 0; 49482035e776STheodore Ts'o if (sb->s_flags & MS_RDONLY) 49492035e776STheodore Ts'o return 1; 49502035e776STheodore Ts'o if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) 49512035e776STheodore Ts'o return 0; 49522035e776STheodore Ts'o return 1; 49532035e776STheodore Ts'o } 495451b7e3c9STheodore Ts'o MODULE_ALIAS("ext3"); 495524b58424STheodore Ts'o #else 495624b58424STheodore Ts'o static inline void register_as_ext3(void) { } 495724b58424STheodore Ts'o static inline void unregister_as_ext3(void) { } 49582035e776STheodore Ts'o static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; } 495924b58424STheodore Ts'o #endif 496024b58424STheodore Ts'o 496103010a33STheodore Ts'o static struct file_system_type ext4_fs_type = { 4962ac27a0ecSDave Kleikamp .owner = THIS_MODULE, 496303010a33STheodore Ts'o .name = "ext4", 4964152a0836SAl Viro .mount = ext4_mount, 4965ac27a0ecSDave Kleikamp .kill_sb = kill_block_super, 4966ac27a0ecSDave Kleikamp .fs_flags = FS_REQUIRES_DEV, 4967ac27a0ecSDave Kleikamp }; 4968ac27a0ecSDave Kleikamp 49698f021222SLukas Czerner static int __init ext4_init_feat_adverts(void) 4970857ac889SLukas Czerner { 4971857ac889SLukas Czerner struct ext4_features *ef; 4972857ac889SLukas Czerner int ret = -ENOMEM; 4973857ac889SLukas Czerner 4974857ac889SLukas Czerner ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL); 4975857ac889SLukas Czerner if (!ef) 4976857ac889SLukas Czerner goto out; 4977857ac889SLukas Czerner 4978857ac889SLukas Czerner ef->f_kobj.kset = ext4_kset; 4979857ac889SLukas Czerner init_completion(&ef->f_kobj_unregister); 4980857ac889SLukas Czerner ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL, 4981857ac889SLukas Czerner "features"); 4982857ac889SLukas Czerner if (ret) { 4983857ac889SLukas Czerner kfree(ef); 4984857ac889SLukas Czerner goto out; 4985857ac889SLukas Czerner } 4986857ac889SLukas Czerner 4987857ac889SLukas Czerner ext4_feat = ef; 4988857ac889SLukas Czerner ret = 0; 4989857ac889SLukas Czerner out: 4990857ac889SLukas Czerner return ret; 4991857ac889SLukas Czerner } 4992857ac889SLukas Czerner 49938f021222SLukas Czerner static void ext4_exit_feat_adverts(void) 49948f021222SLukas Czerner { 49958f021222SLukas Czerner kobject_put(&ext4_feat->f_kobj); 49968f021222SLukas Czerner wait_for_completion(&ext4_feat->f_kobj_unregister); 49978f021222SLukas Czerner kfree(ext4_feat); 49988f021222SLukas Czerner } 49998f021222SLukas Czerner 5000e9e3bcecSEric Sandeen /* Shared across all ext4 file systems */ 5001e9e3bcecSEric Sandeen wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; 5002e9e3bcecSEric Sandeen struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; 5003e9e3bcecSEric Sandeen 50045dabfc78STheodore Ts'o static int __init ext4_init_fs(void) 5005ac27a0ecSDave Kleikamp { 5006e9e3bcecSEric Sandeen int i, err; 5007c9de560dSAlex Tomas 500812e9b892SDmitry Monakhov ext4_check_flag_values(); 5009e9e3bcecSEric Sandeen 5010e9e3bcecSEric Sandeen for (i = 0; i < EXT4_WQ_HASH_SZ; i++) { 5011e9e3bcecSEric Sandeen mutex_init(&ext4__aio_mutex[i]); 5012e9e3bcecSEric Sandeen init_waitqueue_head(&ext4__ioend_wq[i]); 5013e9e3bcecSEric Sandeen } 5014e9e3bcecSEric Sandeen 50155dabfc78STheodore Ts'o err = ext4_init_pageio(); 50166fd058f7STheodore Ts'o if (err) 50176fd058f7STheodore Ts'o return err; 50185dabfc78STheodore Ts'o err = ext4_init_system_zone(); 5019bd2d0210STheodore Ts'o if (err) 5020d44651d0SFabrice Jouhaud goto out6; 50213197ebdbSTheodore Ts'o ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj); 50223197ebdbSTheodore Ts'o if (!ext4_kset) 5023dd68314cSTheodore Ts'o goto out5; 5024d44651d0SFabrice Jouhaud ext4_proc_root = proc_mkdir("fs/ext4", NULL); 5025857ac889SLukas Czerner 5026857ac889SLukas Czerner err = ext4_init_feat_adverts(); 5027dd68314cSTheodore Ts'o if (err) 5028dd68314cSTheodore Ts'o goto out4; 5029857ac889SLukas Czerner 50305dabfc78STheodore Ts'o err = ext4_init_mballoc(); 5031ac27a0ecSDave Kleikamp if (err) 50326fd058f7STheodore Ts'o goto out3; 5033c9de560dSAlex Tomas 50345dabfc78STheodore Ts'o err = ext4_init_xattr(); 5035c9de560dSAlex Tomas if (err) 5036c9de560dSAlex Tomas goto out2; 5037ac27a0ecSDave Kleikamp err = init_inodecache(); 5038ac27a0ecSDave Kleikamp if (err) 5039ac27a0ecSDave Kleikamp goto out1; 504024b58424STheodore Ts'o register_as_ext3(); 50412035e776STheodore Ts'o register_as_ext2(); 504203010a33STheodore Ts'o err = register_filesystem(&ext4_fs_type); 5043ac27a0ecSDave Kleikamp if (err) 5044ac27a0ecSDave Kleikamp goto out; 5045bfff6873SLukas Czerner 5046bfff6873SLukas Czerner ext4_li_info = NULL; 5047bfff6873SLukas Czerner mutex_init(&ext4_li_mtx); 5048ac27a0ecSDave Kleikamp return 0; 5049ac27a0ecSDave Kleikamp out: 505024b58424STheodore Ts'o unregister_as_ext2(); 505124b58424STheodore Ts'o unregister_as_ext3(); 5052ac27a0ecSDave Kleikamp destroy_inodecache(); 5053ac27a0ecSDave Kleikamp out1: 50545dabfc78STheodore Ts'o ext4_exit_xattr(); 5055c9de560dSAlex Tomas out2: 50565dabfc78STheodore Ts'o ext4_exit_mballoc(); 50576fd058f7STheodore Ts'o out3: 50588f021222SLukas Czerner ext4_exit_feat_adverts(); 50596fd058f7STheodore Ts'o out4: 5060d44651d0SFabrice Jouhaud if (ext4_proc_root) 5061dd68314cSTheodore Ts'o remove_proc_entry("fs/ext4", NULL); 5062dd68314cSTheodore Ts'o kset_unregister(ext4_kset); 5063d44651d0SFabrice Jouhaud out5: 5064dd68314cSTheodore Ts'o ext4_exit_system_zone(); 5065d44651d0SFabrice Jouhaud out6: 50665dabfc78STheodore Ts'o ext4_exit_pageio(); 5067ac27a0ecSDave Kleikamp return err; 5068ac27a0ecSDave Kleikamp } 5069ac27a0ecSDave Kleikamp 50705dabfc78STheodore Ts'o static void __exit ext4_exit_fs(void) 5071ac27a0ecSDave Kleikamp { 5072bfff6873SLukas Czerner ext4_destroy_lazyinit_thread(); 507324b58424STheodore Ts'o unregister_as_ext2(); 507424b58424STheodore Ts'o unregister_as_ext3(); 507503010a33STheodore Ts'o unregister_filesystem(&ext4_fs_type); 5076ac27a0ecSDave Kleikamp destroy_inodecache(); 50775dabfc78STheodore Ts'o ext4_exit_xattr(); 50785dabfc78STheodore Ts'o ext4_exit_mballoc(); 50798f021222SLukas Czerner ext4_exit_feat_adverts(); 50809f6200bbSTheodore Ts'o remove_proc_entry("fs/ext4", NULL); 50813197ebdbSTheodore Ts'o kset_unregister(ext4_kset); 50825dabfc78STheodore Ts'o ext4_exit_system_zone(); 50835dabfc78STheodore Ts'o ext4_exit_pageio(); 5084ac27a0ecSDave Kleikamp } 5085ac27a0ecSDave Kleikamp 5086ac27a0ecSDave Kleikamp MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); 508783982b6fSTheodore Ts'o MODULE_DESCRIPTION("Fourth Extended Filesystem"); 5088ac27a0ecSDave Kleikamp MODULE_LICENSE("GPL"); 50895dabfc78STheodore Ts'o module_init(ext4_init_fs) 50905dabfc78STheodore Ts'o module_exit(ext4_exit_fs) 5091