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> 23dab291afSMingming Cao #include <linux/jbd2.h> 24ac27a0ecSDave Kleikamp #include <linux/slab.h> 25ac27a0ecSDave Kleikamp #include <linux/init.h> 26ac27a0ecSDave Kleikamp #include <linux/blkdev.h> 27ac27a0ecSDave Kleikamp #include <linux/parser.h> 28ac27a0ecSDave Kleikamp #include <linux/smp_lock.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> 39ede86cc4STheodore Ts'o #include <linux/marker.h> 401330593eSVignesh Babu #include <linux/log2.h> 41717d50e4SAndreas Dilger #include <linux/crc16.h> 42ac27a0ecSDave Kleikamp #include <asm/uaccess.h> 43ac27a0ecSDave Kleikamp 443dcf5451SChristoph Hellwig #include "ext4.h" 453dcf5451SChristoph Hellwig #include "ext4_jbd2.h" 46ac27a0ecSDave Kleikamp #include "xattr.h" 47ac27a0ecSDave Kleikamp #include "acl.h" 48ac27a0ecSDave Kleikamp #include "namei.h" 49717d50e4SAndreas Dilger #include "group.h" 50ac27a0ecSDave Kleikamp 519f6200bbSTheodore Ts'o struct proc_dir_entry *ext4_proc_root; 523197ebdbSTheodore Ts'o static struct kset *ext4_kset; 539f6200bbSTheodore Ts'o 54617ba13bSMingming Cao static int ext4_load_journal(struct super_block *, struct ext4_super_block *, 55ac27a0ecSDave Kleikamp unsigned long journal_devnum); 56c4be0c1dSTakashi Sato static int ext4_commit_super(struct super_block *sb, 572b2d6d01STheodore Ts'o struct ext4_super_block *es, int sync); 58617ba13bSMingming Cao static void ext4_mark_recovery_complete(struct super_block *sb, 59617ba13bSMingming Cao struct ext4_super_block *es); 60617ba13bSMingming Cao static void ext4_clear_journal_err(struct super_block *sb, 61617ba13bSMingming Cao struct ext4_super_block *es); 62617ba13bSMingming Cao static int ext4_sync_fs(struct super_block *sb, int wait); 63617ba13bSMingming Cao static const char *ext4_decode_error(struct super_block *sb, int errno, 64ac27a0ecSDave Kleikamp char nbuf[16]); 65617ba13bSMingming Cao static int ext4_remount(struct super_block *sb, int *flags, char *data); 66617ba13bSMingming Cao static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf); 67c4be0c1dSTakashi Sato static int ext4_unfreeze(struct super_block *sb); 68617ba13bSMingming Cao static void ext4_write_super(struct super_block *sb); 69c4be0c1dSTakashi Sato static int ext4_freeze(struct super_block *sb); 70ac27a0ecSDave Kleikamp 71bd81d8eeSLaurent Vivier 728fadc143SAlexandre Ratchov ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 738fadc143SAlexandre Ratchov struct ext4_group_desc *bg) 74bd81d8eeSLaurent Vivier { 753a14589cSAneesh Kumar K.V return le32_to_cpu(bg->bg_block_bitmap_lo) | 768fadc143SAlexandre Ratchov (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 778fadc143SAlexandre Ratchov (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); 78bd81d8eeSLaurent Vivier } 79bd81d8eeSLaurent Vivier 808fadc143SAlexandre Ratchov ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 818fadc143SAlexandre Ratchov struct ext4_group_desc *bg) 82bd81d8eeSLaurent Vivier { 835272f837SAneesh Kumar K.V return le32_to_cpu(bg->bg_inode_bitmap_lo) | 848fadc143SAlexandre Ratchov (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 858fadc143SAlexandre Ratchov (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); 86bd81d8eeSLaurent Vivier } 87bd81d8eeSLaurent Vivier 888fadc143SAlexandre Ratchov ext4_fsblk_t ext4_inode_table(struct super_block *sb, 898fadc143SAlexandre Ratchov struct ext4_group_desc *bg) 90bd81d8eeSLaurent Vivier { 915272f837SAneesh Kumar K.V return le32_to_cpu(bg->bg_inode_table_lo) | 928fadc143SAlexandre Ratchov (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 938fadc143SAlexandre Ratchov (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); 94bd81d8eeSLaurent Vivier } 95bd81d8eeSLaurent Vivier 96560671a0SAneesh Kumar K.V __u32 ext4_free_blks_count(struct super_block *sb, 97560671a0SAneesh Kumar K.V struct ext4_group_desc *bg) 98560671a0SAneesh Kumar K.V { 99560671a0SAneesh Kumar K.V return le16_to_cpu(bg->bg_free_blocks_count_lo) | 100560671a0SAneesh Kumar K.V (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 101560671a0SAneesh Kumar K.V (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0); 102560671a0SAneesh Kumar K.V } 103560671a0SAneesh Kumar K.V 104560671a0SAneesh Kumar K.V __u32 ext4_free_inodes_count(struct super_block *sb, 105560671a0SAneesh Kumar K.V struct ext4_group_desc *bg) 106560671a0SAneesh Kumar K.V { 107560671a0SAneesh Kumar K.V return le16_to_cpu(bg->bg_free_inodes_count_lo) | 108560671a0SAneesh Kumar K.V (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 109560671a0SAneesh Kumar K.V (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0); 110560671a0SAneesh Kumar K.V } 111560671a0SAneesh Kumar K.V 112560671a0SAneesh Kumar K.V __u32 ext4_used_dirs_count(struct super_block *sb, 113560671a0SAneesh Kumar K.V struct ext4_group_desc *bg) 114560671a0SAneesh Kumar K.V { 115560671a0SAneesh Kumar K.V return le16_to_cpu(bg->bg_used_dirs_count_lo) | 116560671a0SAneesh Kumar K.V (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 117560671a0SAneesh Kumar K.V (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0); 118560671a0SAneesh Kumar K.V } 119560671a0SAneesh Kumar K.V 120560671a0SAneesh Kumar K.V __u32 ext4_itable_unused_count(struct super_block *sb, 121560671a0SAneesh Kumar K.V struct ext4_group_desc *bg) 122560671a0SAneesh Kumar K.V { 123560671a0SAneesh Kumar K.V return le16_to_cpu(bg->bg_itable_unused_lo) | 124560671a0SAneesh Kumar K.V (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 125560671a0SAneesh Kumar K.V (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0); 126560671a0SAneesh Kumar K.V } 127560671a0SAneesh Kumar K.V 1288fadc143SAlexandre Ratchov void ext4_block_bitmap_set(struct super_block *sb, 1298fadc143SAlexandre Ratchov struct ext4_group_desc *bg, ext4_fsblk_t blk) 130bd81d8eeSLaurent Vivier { 1313a14589cSAneesh Kumar K.V bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); 1328fadc143SAlexandre Ratchov if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 1338fadc143SAlexandre Ratchov bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); 134bd81d8eeSLaurent Vivier } 135bd81d8eeSLaurent Vivier 1368fadc143SAlexandre Ratchov void ext4_inode_bitmap_set(struct super_block *sb, 1378fadc143SAlexandre Ratchov struct ext4_group_desc *bg, ext4_fsblk_t blk) 138bd81d8eeSLaurent Vivier { 1395272f837SAneesh Kumar K.V bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); 1408fadc143SAlexandre Ratchov if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 1418fadc143SAlexandre Ratchov bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); 142bd81d8eeSLaurent Vivier } 143bd81d8eeSLaurent Vivier 1448fadc143SAlexandre Ratchov void ext4_inode_table_set(struct super_block *sb, 1458fadc143SAlexandre Ratchov struct ext4_group_desc *bg, ext4_fsblk_t blk) 146bd81d8eeSLaurent Vivier { 1475272f837SAneesh Kumar K.V bg->bg_inode_table_lo = cpu_to_le32((u32)blk); 1488fadc143SAlexandre Ratchov if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 1498fadc143SAlexandre Ratchov bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); 150bd81d8eeSLaurent Vivier } 151bd81d8eeSLaurent Vivier 152560671a0SAneesh Kumar K.V void ext4_free_blks_set(struct super_block *sb, 153560671a0SAneesh Kumar K.V struct ext4_group_desc *bg, __u32 count) 154560671a0SAneesh Kumar K.V { 155560671a0SAneesh Kumar K.V bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count); 156560671a0SAneesh Kumar K.V if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 157560671a0SAneesh Kumar K.V bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16); 158560671a0SAneesh Kumar K.V } 159560671a0SAneesh Kumar K.V 160560671a0SAneesh Kumar K.V void ext4_free_inodes_set(struct super_block *sb, 161560671a0SAneesh Kumar K.V struct ext4_group_desc *bg, __u32 count) 162560671a0SAneesh Kumar K.V { 163560671a0SAneesh Kumar K.V bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count); 164560671a0SAneesh Kumar K.V if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 165560671a0SAneesh Kumar K.V bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16); 166560671a0SAneesh Kumar K.V } 167560671a0SAneesh Kumar K.V 168560671a0SAneesh Kumar K.V void ext4_used_dirs_set(struct super_block *sb, 169560671a0SAneesh Kumar K.V struct ext4_group_desc *bg, __u32 count) 170560671a0SAneesh Kumar K.V { 171560671a0SAneesh Kumar K.V bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count); 172560671a0SAneesh Kumar K.V if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 173560671a0SAneesh Kumar K.V bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16); 174560671a0SAneesh Kumar K.V } 175560671a0SAneesh Kumar K.V 176560671a0SAneesh Kumar K.V void ext4_itable_unused_set(struct super_block *sb, 177560671a0SAneesh Kumar K.V struct ext4_group_desc *bg, __u32 count) 178560671a0SAneesh Kumar K.V { 179560671a0SAneesh Kumar K.V bg->bg_itable_unused_lo = cpu_to_le16((__u16)count); 180560671a0SAneesh Kumar K.V if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 181560671a0SAneesh Kumar K.V bg->bg_itable_unused_hi = cpu_to_le16(count >> 16); 182560671a0SAneesh Kumar K.V } 183560671a0SAneesh Kumar K.V 184ac27a0ecSDave Kleikamp /* 185dab291afSMingming Cao * Wrappers for jbd2_journal_start/end. 186ac27a0ecSDave Kleikamp * 187ac27a0ecSDave Kleikamp * The only special thing we need to do here is to make sure that all 188ac27a0ecSDave Kleikamp * journal_end calls result in the superblock being marked dirty, so 189ac27a0ecSDave Kleikamp * that sync() will call the filesystem's write_super callback if 190ac27a0ecSDave Kleikamp * appropriate. 191ac27a0ecSDave Kleikamp */ 192617ba13bSMingming Cao handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) 193ac27a0ecSDave Kleikamp { 194ac27a0ecSDave Kleikamp journal_t *journal; 195ac27a0ecSDave Kleikamp 196ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) 197ac27a0ecSDave Kleikamp return ERR_PTR(-EROFS); 198ac27a0ecSDave Kleikamp 199ac27a0ecSDave Kleikamp /* Special case here: if the journal has aborted behind our 200ac27a0ecSDave Kleikamp * backs (eg. EIO in the commit thread), then we still need to 201ac27a0ecSDave Kleikamp * take the FS itself readonly cleanly. */ 202617ba13bSMingming Cao journal = EXT4_SB(sb)->s_journal; 2030390131bSFrank Mayhar if (journal) { 204ac27a0ecSDave Kleikamp if (is_journal_aborted(journal)) { 20546e665e9SHarvey Harrison ext4_abort(sb, __func__, 206ac27a0ecSDave Kleikamp "Detected aborted journal"); 207ac27a0ecSDave Kleikamp return ERR_PTR(-EROFS); 208ac27a0ecSDave Kleikamp } 209dab291afSMingming Cao return jbd2_journal_start(journal, nblocks); 210ac27a0ecSDave Kleikamp } 2110390131bSFrank Mayhar /* 2120390131bSFrank Mayhar * We're not journaling, return the appropriate indication. 2130390131bSFrank Mayhar */ 2140390131bSFrank Mayhar current->journal_info = EXT4_NOJOURNAL_HANDLE; 2150390131bSFrank Mayhar return current->journal_info; 2160390131bSFrank Mayhar } 217ac27a0ecSDave Kleikamp 218ac27a0ecSDave Kleikamp /* 219ac27a0ecSDave Kleikamp * The only special thing we need to do here is to make sure that all 220dab291afSMingming Cao * jbd2_journal_stop calls result in the superblock being marked dirty, so 221ac27a0ecSDave Kleikamp * that sync() will call the filesystem's write_super callback if 222ac27a0ecSDave Kleikamp * appropriate. 223ac27a0ecSDave Kleikamp */ 224617ba13bSMingming Cao int __ext4_journal_stop(const char *where, handle_t *handle) 225ac27a0ecSDave Kleikamp { 226ac27a0ecSDave Kleikamp struct super_block *sb; 227ac27a0ecSDave Kleikamp int err; 228ac27a0ecSDave Kleikamp int rc; 229ac27a0ecSDave Kleikamp 2300390131bSFrank Mayhar if (!ext4_handle_valid(handle)) { 2310390131bSFrank Mayhar /* 2320390131bSFrank Mayhar * Do this here since we don't call jbd2_journal_stop() in 2330390131bSFrank Mayhar * no-journal mode. 2340390131bSFrank Mayhar */ 2350390131bSFrank Mayhar current->journal_info = NULL; 2360390131bSFrank Mayhar return 0; 2370390131bSFrank Mayhar } 238ac27a0ecSDave Kleikamp sb = handle->h_transaction->t_journal->j_private; 239ac27a0ecSDave Kleikamp err = handle->h_err; 240dab291afSMingming Cao rc = jbd2_journal_stop(handle); 241ac27a0ecSDave Kleikamp 242ac27a0ecSDave Kleikamp if (!err) 243ac27a0ecSDave Kleikamp err = rc; 244ac27a0ecSDave Kleikamp if (err) 245617ba13bSMingming Cao __ext4_std_error(sb, where, err); 246ac27a0ecSDave Kleikamp return err; 247ac27a0ecSDave Kleikamp } 248ac27a0ecSDave Kleikamp 249617ba13bSMingming Cao void ext4_journal_abort_handle(const char *caller, const char *err_fn, 250ac27a0ecSDave Kleikamp struct buffer_head *bh, handle_t *handle, int err) 251ac27a0ecSDave Kleikamp { 252ac27a0ecSDave Kleikamp char nbuf[16]; 253617ba13bSMingming Cao const char *errstr = ext4_decode_error(NULL, err, nbuf); 254ac27a0ecSDave Kleikamp 2550390131bSFrank Mayhar BUG_ON(!ext4_handle_valid(handle)); 2560390131bSFrank Mayhar 257ac27a0ecSDave Kleikamp if (bh) 258ac27a0ecSDave Kleikamp BUFFER_TRACE(bh, "abort"); 259ac27a0ecSDave Kleikamp 260ac27a0ecSDave Kleikamp if (!handle->h_err) 261ac27a0ecSDave Kleikamp handle->h_err = err; 262ac27a0ecSDave Kleikamp 263ac27a0ecSDave Kleikamp if (is_handle_aborted(handle)) 264ac27a0ecSDave Kleikamp return; 265ac27a0ecSDave Kleikamp 266ac27a0ecSDave Kleikamp printk(KERN_ERR "%s: aborting transaction: %s in %s\n", 267ac27a0ecSDave Kleikamp caller, errstr, err_fn); 268ac27a0ecSDave Kleikamp 269dab291afSMingming Cao jbd2_journal_abort_handle(handle); 270ac27a0ecSDave Kleikamp } 271ac27a0ecSDave Kleikamp 272ac27a0ecSDave Kleikamp /* Deal with the reporting of failure conditions on a filesystem such as 273ac27a0ecSDave Kleikamp * inconsistencies detected or read IO failures. 274ac27a0ecSDave Kleikamp * 275ac27a0ecSDave Kleikamp * On ext2, we can store the error state of the filesystem in the 276617ba13bSMingming Cao * superblock. That is not possible on ext4, because we may have other 277ac27a0ecSDave Kleikamp * write ordering constraints on the superblock which prevent us from 278ac27a0ecSDave Kleikamp * writing it out straight away; and given that the journal is about to 279ac27a0ecSDave Kleikamp * be aborted, we can't rely on the current, or future, transactions to 280ac27a0ecSDave Kleikamp * write out the superblock safely. 281ac27a0ecSDave Kleikamp * 282dab291afSMingming Cao * We'll just use the jbd2_journal_abort() error code to record an error in 283ac27a0ecSDave Kleikamp * the journal instead. On recovery, the journal will compain about 284ac27a0ecSDave Kleikamp * that error until we've noted it down and cleared it. 285ac27a0ecSDave Kleikamp */ 286ac27a0ecSDave Kleikamp 287617ba13bSMingming Cao static void ext4_handle_error(struct super_block *sb) 288ac27a0ecSDave Kleikamp { 289617ba13bSMingming Cao struct ext4_super_block *es = EXT4_SB(sb)->s_es; 290ac27a0ecSDave Kleikamp 291617ba13bSMingming Cao EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 292617ba13bSMingming Cao es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 293ac27a0ecSDave Kleikamp 294ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) 295ac27a0ecSDave Kleikamp return; 296ac27a0ecSDave Kleikamp 297ac27a0ecSDave Kleikamp if (!test_opt(sb, ERRORS_CONT)) { 298617ba13bSMingming Cao journal_t *journal = EXT4_SB(sb)->s_journal; 299ac27a0ecSDave Kleikamp 300617ba13bSMingming Cao EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; 301ac27a0ecSDave Kleikamp if (journal) 302dab291afSMingming Cao jbd2_journal_abort(journal, -EIO); 303ac27a0ecSDave Kleikamp } 304ac27a0ecSDave Kleikamp if (test_opt(sb, ERRORS_RO)) { 305ac27a0ecSDave Kleikamp printk(KERN_CRIT "Remounting filesystem read-only\n"); 306ac27a0ecSDave Kleikamp sb->s_flags |= MS_RDONLY; 307ac27a0ecSDave Kleikamp } 308617ba13bSMingming Cao ext4_commit_super(sb, es, 1); 309ac27a0ecSDave Kleikamp if (test_opt(sb, ERRORS_PANIC)) 310617ba13bSMingming Cao panic("EXT4-fs (device %s): panic forced after error\n", 311ac27a0ecSDave Kleikamp sb->s_id); 312ac27a0ecSDave Kleikamp } 313ac27a0ecSDave Kleikamp 314617ba13bSMingming Cao void ext4_error(struct super_block *sb, const char *function, 315ac27a0ecSDave Kleikamp const char *fmt, ...) 316ac27a0ecSDave Kleikamp { 317ac27a0ecSDave Kleikamp va_list args; 318ac27a0ecSDave Kleikamp 319ac27a0ecSDave Kleikamp va_start(args, fmt); 320617ba13bSMingming Cao printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function); 321ac27a0ecSDave Kleikamp vprintk(fmt, args); 322ac27a0ecSDave Kleikamp printk("\n"); 323ac27a0ecSDave Kleikamp va_end(args); 324ac27a0ecSDave Kleikamp 325617ba13bSMingming Cao ext4_handle_error(sb); 326ac27a0ecSDave Kleikamp } 327ac27a0ecSDave Kleikamp 328617ba13bSMingming Cao static const char *ext4_decode_error(struct super_block *sb, int errno, 329ac27a0ecSDave Kleikamp char nbuf[16]) 330ac27a0ecSDave Kleikamp { 331ac27a0ecSDave Kleikamp char *errstr = NULL; 332ac27a0ecSDave Kleikamp 333ac27a0ecSDave Kleikamp switch (errno) { 334ac27a0ecSDave Kleikamp case -EIO: 335ac27a0ecSDave Kleikamp errstr = "IO failure"; 336ac27a0ecSDave Kleikamp break; 337ac27a0ecSDave Kleikamp case -ENOMEM: 338ac27a0ecSDave Kleikamp errstr = "Out of memory"; 339ac27a0ecSDave Kleikamp break; 340ac27a0ecSDave Kleikamp case -EROFS: 341dab291afSMingming Cao if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT) 342ac27a0ecSDave Kleikamp errstr = "Journal has aborted"; 343ac27a0ecSDave Kleikamp else 344ac27a0ecSDave Kleikamp errstr = "Readonly filesystem"; 345ac27a0ecSDave Kleikamp break; 346ac27a0ecSDave Kleikamp default: 347ac27a0ecSDave Kleikamp /* If the caller passed in an extra buffer for unknown 348ac27a0ecSDave Kleikamp * errors, textualise them now. Else we just return 349ac27a0ecSDave Kleikamp * NULL. */ 350ac27a0ecSDave Kleikamp if (nbuf) { 351ac27a0ecSDave Kleikamp /* Check for truncated error codes... */ 352ac27a0ecSDave Kleikamp if (snprintf(nbuf, 16, "error %d", -errno) >= 0) 353ac27a0ecSDave Kleikamp errstr = nbuf; 354ac27a0ecSDave Kleikamp } 355ac27a0ecSDave Kleikamp break; 356ac27a0ecSDave Kleikamp } 357ac27a0ecSDave Kleikamp 358ac27a0ecSDave Kleikamp return errstr; 359ac27a0ecSDave Kleikamp } 360ac27a0ecSDave Kleikamp 361617ba13bSMingming Cao /* __ext4_std_error decodes expected errors from journaling functions 362ac27a0ecSDave Kleikamp * automatically and invokes the appropriate error response. */ 363ac27a0ecSDave Kleikamp 3642b2d6d01STheodore Ts'o void __ext4_std_error(struct super_block *sb, const char *function, int errno) 365ac27a0ecSDave Kleikamp { 366ac27a0ecSDave Kleikamp char nbuf[16]; 367ac27a0ecSDave Kleikamp const char *errstr; 368ac27a0ecSDave Kleikamp 369ac27a0ecSDave Kleikamp /* Special case: if the error is EROFS, and we're not already 370ac27a0ecSDave Kleikamp * inside a transaction, then there's really no point in logging 371ac27a0ecSDave Kleikamp * an error. */ 372ac27a0ecSDave Kleikamp if (errno == -EROFS && journal_current_handle() == NULL && 373ac27a0ecSDave Kleikamp (sb->s_flags & MS_RDONLY)) 374ac27a0ecSDave Kleikamp return; 375ac27a0ecSDave Kleikamp 376617ba13bSMingming Cao errstr = ext4_decode_error(sb, errno, nbuf); 377617ba13bSMingming Cao printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n", 378ac27a0ecSDave Kleikamp sb->s_id, function, errstr); 379ac27a0ecSDave Kleikamp 380617ba13bSMingming Cao ext4_handle_error(sb); 381ac27a0ecSDave Kleikamp } 382ac27a0ecSDave Kleikamp 383ac27a0ecSDave Kleikamp /* 384617ba13bSMingming Cao * ext4_abort is a much stronger failure handler than ext4_error. The 385ac27a0ecSDave Kleikamp * abort function may be used to deal with unrecoverable failures such 386ac27a0ecSDave Kleikamp * as journal IO errors or ENOMEM at a critical moment in log management. 387ac27a0ecSDave Kleikamp * 388ac27a0ecSDave Kleikamp * We unconditionally force the filesystem into an ABORT|READONLY state, 389ac27a0ecSDave Kleikamp * unless the error response on the fs has been set to panic in which 390ac27a0ecSDave Kleikamp * case we take the easy way out and panic immediately. 391ac27a0ecSDave Kleikamp */ 392ac27a0ecSDave Kleikamp 393617ba13bSMingming Cao void ext4_abort(struct super_block *sb, const char *function, 394ac27a0ecSDave Kleikamp const char *fmt, ...) 395ac27a0ecSDave Kleikamp { 396ac27a0ecSDave Kleikamp va_list args; 397ac27a0ecSDave Kleikamp 398617ba13bSMingming Cao printk(KERN_CRIT "ext4_abort called.\n"); 399ac27a0ecSDave Kleikamp 400ac27a0ecSDave Kleikamp va_start(args, fmt); 401617ba13bSMingming Cao printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function); 402ac27a0ecSDave Kleikamp vprintk(fmt, args); 403ac27a0ecSDave Kleikamp printk("\n"); 404ac27a0ecSDave Kleikamp va_end(args); 405ac27a0ecSDave Kleikamp 406ac27a0ecSDave Kleikamp if (test_opt(sb, ERRORS_PANIC)) 407617ba13bSMingming Cao panic("EXT4-fs panic from previous error\n"); 408ac27a0ecSDave Kleikamp 409ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) 410ac27a0ecSDave Kleikamp return; 411ac27a0ecSDave Kleikamp 412ac27a0ecSDave Kleikamp printk(KERN_CRIT "Remounting filesystem read-only\n"); 413617ba13bSMingming Cao EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 414ac27a0ecSDave Kleikamp sb->s_flags |= MS_RDONLY; 415617ba13bSMingming Cao EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; 416ef2cabf7SHidehiro Kawai if (EXT4_SB(sb)->s_journal) 417dab291afSMingming Cao jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); 418ac27a0ecSDave Kleikamp } 419ac27a0ecSDave Kleikamp 420617ba13bSMingming Cao void ext4_warning(struct super_block *sb, const char *function, 421ac27a0ecSDave Kleikamp const char *fmt, ...) 422ac27a0ecSDave Kleikamp { 423ac27a0ecSDave Kleikamp va_list args; 424ac27a0ecSDave Kleikamp 425ac27a0ecSDave Kleikamp va_start(args, fmt); 426617ba13bSMingming Cao printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ", 427ac27a0ecSDave Kleikamp sb->s_id, function); 428ac27a0ecSDave Kleikamp vprintk(fmt, args); 429ac27a0ecSDave Kleikamp printk("\n"); 430ac27a0ecSDave Kleikamp va_end(args); 431ac27a0ecSDave Kleikamp } 432ac27a0ecSDave Kleikamp 4335d1b1b3fSAneesh Kumar K.V void ext4_grp_locked_error(struct super_block *sb, ext4_group_t grp, 4345d1b1b3fSAneesh Kumar K.V const char *function, const char *fmt, ...) 4355d1b1b3fSAneesh Kumar K.V __releases(bitlock) 4365d1b1b3fSAneesh Kumar K.V __acquires(bitlock) 4375d1b1b3fSAneesh Kumar K.V { 4385d1b1b3fSAneesh Kumar K.V va_list args; 4395d1b1b3fSAneesh Kumar K.V struct ext4_super_block *es = EXT4_SB(sb)->s_es; 4405d1b1b3fSAneesh Kumar K.V 4415d1b1b3fSAneesh Kumar K.V va_start(args, fmt); 4425d1b1b3fSAneesh Kumar K.V printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function); 4435d1b1b3fSAneesh Kumar K.V vprintk(fmt, args); 4445d1b1b3fSAneesh Kumar K.V printk("\n"); 4455d1b1b3fSAneesh Kumar K.V va_end(args); 4465d1b1b3fSAneesh Kumar K.V 4475d1b1b3fSAneesh Kumar K.V if (test_opt(sb, ERRORS_CONT)) { 4485d1b1b3fSAneesh Kumar K.V EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 4495d1b1b3fSAneesh Kumar K.V es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 4505d1b1b3fSAneesh Kumar K.V ext4_commit_super(sb, es, 0); 4515d1b1b3fSAneesh Kumar K.V return; 4525d1b1b3fSAneesh Kumar K.V } 4535d1b1b3fSAneesh Kumar K.V ext4_unlock_group(sb, grp); 4545d1b1b3fSAneesh Kumar K.V ext4_handle_error(sb); 4555d1b1b3fSAneesh Kumar K.V /* 4565d1b1b3fSAneesh Kumar K.V * We only get here in the ERRORS_RO case; relocking the group 4575d1b1b3fSAneesh Kumar K.V * may be dangerous, but nothing bad will happen since the 4585d1b1b3fSAneesh Kumar K.V * filesystem will have already been marked read/only and the 4595d1b1b3fSAneesh Kumar K.V * journal has been aborted. We return 1 as a hint to callers 4605d1b1b3fSAneesh Kumar K.V * who might what to use the return value from 4615d1b1b3fSAneesh Kumar K.V * ext4_grp_locked_error() to distinguish beween the 4625d1b1b3fSAneesh Kumar K.V * ERRORS_CONT and ERRORS_RO case, and perhaps return more 4635d1b1b3fSAneesh Kumar K.V * aggressively from the ext4 function in question, with a 4645d1b1b3fSAneesh Kumar K.V * more appropriate error code. 4655d1b1b3fSAneesh Kumar K.V */ 4665d1b1b3fSAneesh Kumar K.V ext4_lock_group(sb, grp); 4675d1b1b3fSAneesh Kumar K.V return; 4685d1b1b3fSAneesh Kumar K.V } 4695d1b1b3fSAneesh Kumar K.V 4705d1b1b3fSAneesh Kumar K.V 471617ba13bSMingming Cao void ext4_update_dynamic_rev(struct super_block *sb) 472ac27a0ecSDave Kleikamp { 473617ba13bSMingming Cao struct ext4_super_block *es = EXT4_SB(sb)->s_es; 474ac27a0ecSDave Kleikamp 475617ba13bSMingming Cao if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) 476ac27a0ecSDave Kleikamp return; 477ac27a0ecSDave Kleikamp 47846e665e9SHarvey Harrison ext4_warning(sb, __func__, 479ac27a0ecSDave Kleikamp "updating to rev %d because of new feature flag, " 480ac27a0ecSDave Kleikamp "running e2fsck is recommended", 481617ba13bSMingming Cao EXT4_DYNAMIC_REV); 482ac27a0ecSDave Kleikamp 483617ba13bSMingming Cao es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); 484617ba13bSMingming Cao es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); 485617ba13bSMingming Cao es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); 486ac27a0ecSDave Kleikamp /* leave es->s_feature_*compat flags alone */ 487ac27a0ecSDave Kleikamp /* es->s_uuid will be set by e2fsck if empty */ 488ac27a0ecSDave Kleikamp 489ac27a0ecSDave Kleikamp /* 490ac27a0ecSDave Kleikamp * The rest of the superblock fields should be zero, and if not it 491ac27a0ecSDave Kleikamp * means they are likely already in use, so leave them alone. We 492ac27a0ecSDave Kleikamp * can leave it up to e2fsck to clean up any inconsistencies there. 493ac27a0ecSDave Kleikamp */ 494ac27a0ecSDave Kleikamp } 495ac27a0ecSDave Kleikamp 496ac27a0ecSDave Kleikamp /* 497ac27a0ecSDave Kleikamp * Open the external journal device 498ac27a0ecSDave Kleikamp */ 499617ba13bSMingming Cao static struct block_device *ext4_blkdev_get(dev_t dev) 500ac27a0ecSDave Kleikamp { 501ac27a0ecSDave Kleikamp struct block_device *bdev; 502ac27a0ecSDave Kleikamp char b[BDEVNAME_SIZE]; 503ac27a0ecSDave Kleikamp 504ac27a0ecSDave Kleikamp bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); 505ac27a0ecSDave Kleikamp if (IS_ERR(bdev)) 506ac27a0ecSDave Kleikamp goto fail; 507ac27a0ecSDave Kleikamp return bdev; 508ac27a0ecSDave Kleikamp 509ac27a0ecSDave Kleikamp fail: 510abda1418STheodore Ts'o printk(KERN_ERR "EXT4-fs: failed to open journal device %s: %ld\n", 511ac27a0ecSDave Kleikamp __bdevname(dev, b), PTR_ERR(bdev)); 512ac27a0ecSDave Kleikamp return NULL; 513ac27a0ecSDave Kleikamp } 514ac27a0ecSDave Kleikamp 515ac27a0ecSDave Kleikamp /* 516ac27a0ecSDave Kleikamp * Release the journal device 517ac27a0ecSDave Kleikamp */ 518617ba13bSMingming Cao static int ext4_blkdev_put(struct block_device *bdev) 519ac27a0ecSDave Kleikamp { 520ac27a0ecSDave Kleikamp bd_release(bdev); 5219a1c3542SAl Viro return blkdev_put(bdev, FMODE_READ|FMODE_WRITE); 522ac27a0ecSDave Kleikamp } 523ac27a0ecSDave Kleikamp 524617ba13bSMingming Cao static int ext4_blkdev_remove(struct ext4_sb_info *sbi) 525ac27a0ecSDave Kleikamp { 526ac27a0ecSDave Kleikamp struct block_device *bdev; 527ac27a0ecSDave Kleikamp int ret = -ENODEV; 528ac27a0ecSDave Kleikamp 529ac27a0ecSDave Kleikamp bdev = sbi->journal_bdev; 530ac27a0ecSDave Kleikamp if (bdev) { 531617ba13bSMingming Cao ret = ext4_blkdev_put(bdev); 532ac27a0ecSDave Kleikamp sbi->journal_bdev = NULL; 533ac27a0ecSDave Kleikamp } 534ac27a0ecSDave Kleikamp return ret; 535ac27a0ecSDave Kleikamp } 536ac27a0ecSDave Kleikamp 537ac27a0ecSDave Kleikamp static inline struct inode *orphan_list_entry(struct list_head *l) 538ac27a0ecSDave Kleikamp { 539617ba13bSMingming Cao return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; 540ac27a0ecSDave Kleikamp } 541ac27a0ecSDave Kleikamp 542617ba13bSMingming Cao static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) 543ac27a0ecSDave Kleikamp { 544ac27a0ecSDave Kleikamp struct list_head *l; 545ac27a0ecSDave Kleikamp 546ac27a0ecSDave Kleikamp printk(KERN_ERR "sb orphan head is %d\n", 547ac27a0ecSDave Kleikamp le32_to_cpu(sbi->s_es->s_last_orphan)); 548ac27a0ecSDave Kleikamp 549ac27a0ecSDave Kleikamp printk(KERN_ERR "sb_info orphan list:\n"); 550ac27a0ecSDave Kleikamp list_for_each(l, &sbi->s_orphan) { 551ac27a0ecSDave Kleikamp struct inode *inode = orphan_list_entry(l); 552ac27a0ecSDave Kleikamp printk(KERN_ERR " " 553ac27a0ecSDave Kleikamp "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", 554ac27a0ecSDave Kleikamp inode->i_sb->s_id, inode->i_ino, inode, 555ac27a0ecSDave Kleikamp inode->i_mode, inode->i_nlink, 556ac27a0ecSDave Kleikamp NEXT_ORPHAN(inode)); 557ac27a0ecSDave Kleikamp } 558ac27a0ecSDave Kleikamp } 559ac27a0ecSDave Kleikamp 560617ba13bSMingming Cao static void ext4_put_super(struct super_block *sb) 561ac27a0ecSDave Kleikamp { 562617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 563617ba13bSMingming Cao struct ext4_super_block *es = sbi->s_es; 564ef2cabf7SHidehiro Kawai int i, err; 565ac27a0ecSDave Kleikamp 566c9de560dSAlex Tomas ext4_mb_release(sb); 567a86c6181SAlex Tomas ext4_ext_release(sb); 568617ba13bSMingming Cao ext4_xattr_put_super(sb); 5690390131bSFrank Mayhar if (sbi->s_journal) { 570ef2cabf7SHidehiro Kawai err = jbd2_journal_destroy(sbi->s_journal); 57147b4a50bSJan Kara sbi->s_journal = NULL; 572ef2cabf7SHidehiro Kawai if (err < 0) 5730390131bSFrank Mayhar ext4_abort(sb, __func__, 5740390131bSFrank Mayhar "Couldn't clean up the journal"); 5750390131bSFrank Mayhar } 576ac27a0ecSDave Kleikamp if (!(sb->s_flags & MS_RDONLY)) { 577617ba13bSMingming Cao EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 578ac27a0ecSDave Kleikamp es->s_state = cpu_to_le16(sbi->s_mount_state); 579617ba13bSMingming Cao ext4_commit_super(sb, es, 1); 580ac27a0ecSDave Kleikamp } 581240799cdSTheodore Ts'o if (sbi->s_proc) { 582240799cdSTheodore Ts'o remove_proc_entry("inode_readahead_blks", sbi->s_proc); 5839f6200bbSTheodore Ts'o remove_proc_entry(sb->s_id, ext4_proc_root); 584240799cdSTheodore Ts'o } 5853197ebdbSTheodore Ts'o kobject_del(&sbi->s_kobj); 586ac27a0ecSDave Kleikamp 587ac27a0ecSDave Kleikamp for (i = 0; i < sbi->s_gdb_count; i++) 588ac27a0ecSDave Kleikamp brelse(sbi->s_group_desc[i]); 589ac27a0ecSDave Kleikamp kfree(sbi->s_group_desc); 590772cb7c8SJose R. Santos kfree(sbi->s_flex_groups); 591ac27a0ecSDave Kleikamp percpu_counter_destroy(&sbi->s_freeblocks_counter); 592ac27a0ecSDave Kleikamp percpu_counter_destroy(&sbi->s_freeinodes_counter); 593ac27a0ecSDave Kleikamp percpu_counter_destroy(&sbi->s_dirs_counter); 5946bc6e63fSAneesh Kumar K.V percpu_counter_destroy(&sbi->s_dirtyblocks_counter); 595ac27a0ecSDave Kleikamp brelse(sbi->s_sbh); 596ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 597ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) 598ac27a0ecSDave Kleikamp kfree(sbi->s_qf_names[i]); 599ac27a0ecSDave Kleikamp #endif 600ac27a0ecSDave Kleikamp 601ac27a0ecSDave Kleikamp /* Debugging code just in case the in-memory inode orphan list 602ac27a0ecSDave Kleikamp * isn't empty. The on-disk one can be non-empty if we've 603ac27a0ecSDave Kleikamp * detected an error and taken the fs readonly, but the 604ac27a0ecSDave Kleikamp * in-memory list had better be clean by this point. */ 605ac27a0ecSDave Kleikamp if (!list_empty(&sbi->s_orphan)) 606ac27a0ecSDave Kleikamp dump_orphan_list(sb, sbi); 607ac27a0ecSDave Kleikamp J_ASSERT(list_empty(&sbi->s_orphan)); 608ac27a0ecSDave Kleikamp 609f98393a6SPeter Zijlstra invalidate_bdev(sb->s_bdev); 610ac27a0ecSDave Kleikamp if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { 611ac27a0ecSDave Kleikamp /* 612ac27a0ecSDave Kleikamp * Invalidate the journal device's buffers. We don't want them 613ac27a0ecSDave Kleikamp * floating about in memory - the physical journal device may 614ac27a0ecSDave Kleikamp * hotswapped, and it breaks the `ro-after' testing code. 615ac27a0ecSDave Kleikamp */ 616ac27a0ecSDave Kleikamp sync_blockdev(sbi->journal_bdev); 617f98393a6SPeter Zijlstra invalidate_bdev(sbi->journal_bdev); 618617ba13bSMingming Cao ext4_blkdev_remove(sbi); 619ac27a0ecSDave Kleikamp } 620ac27a0ecSDave Kleikamp sb->s_fs_info = NULL; 6213197ebdbSTheodore Ts'o /* 6223197ebdbSTheodore Ts'o * Now that we are completely done shutting down the 6233197ebdbSTheodore Ts'o * superblock, we need to actually destroy the kobject. 6243197ebdbSTheodore Ts'o */ 6253197ebdbSTheodore Ts'o unlock_kernel(); 6263197ebdbSTheodore Ts'o unlock_super(sb); 6273197ebdbSTheodore Ts'o kobject_put(&sbi->s_kobj); 6283197ebdbSTheodore Ts'o wait_for_completion(&sbi->s_kobj_unregister); 6293197ebdbSTheodore Ts'o lock_super(sb); 6303197ebdbSTheodore Ts'o lock_kernel(); 631705895b6SPekka Enberg kfree(sbi->s_blockgroup_lock); 632ac27a0ecSDave Kleikamp kfree(sbi); 633ac27a0ecSDave Kleikamp return; 634ac27a0ecSDave Kleikamp } 635ac27a0ecSDave Kleikamp 636e18b890bSChristoph Lameter static struct kmem_cache *ext4_inode_cachep; 637ac27a0ecSDave Kleikamp 638ac27a0ecSDave Kleikamp /* 639ac27a0ecSDave Kleikamp * Called inside transaction, so use GFP_NOFS 640ac27a0ecSDave Kleikamp */ 641617ba13bSMingming Cao static struct inode *ext4_alloc_inode(struct super_block *sb) 642ac27a0ecSDave Kleikamp { 643617ba13bSMingming Cao struct ext4_inode_info *ei; 644ac27a0ecSDave Kleikamp 645e6b4f8daSChristoph Lameter ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); 646ac27a0ecSDave Kleikamp if (!ei) 647ac27a0ecSDave Kleikamp return NULL; 64803010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 649617ba13bSMingming Cao ei->i_acl = EXT4_ACL_NOT_CACHED; 650617ba13bSMingming Cao ei->i_default_acl = EXT4_ACL_NOT_CACHED; 651ac27a0ecSDave Kleikamp #endif 652ac27a0ecSDave Kleikamp ei->vfs_inode.i_version = 1; 65391246c00SAneesh Kumar K.V ei->vfs_inode.i_data.writeback_index = 0; 654a86c6181SAlex Tomas memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); 655c9de560dSAlex Tomas INIT_LIST_HEAD(&ei->i_prealloc_list); 656c9de560dSAlex Tomas spin_lock_init(&ei->i_prealloc_lock); 6570390131bSFrank Mayhar /* 6580390131bSFrank Mayhar * Note: We can be called before EXT4_SB(sb)->s_journal is set, 6590390131bSFrank Mayhar * therefore it can be null here. Don't check it, just initialize 6600390131bSFrank Mayhar * jinode. 6610390131bSFrank Mayhar */ 662678aaf48SJan Kara jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode); 663d2a17637SMingming Cao ei->i_reserved_data_blocks = 0; 664d2a17637SMingming Cao ei->i_reserved_meta_blocks = 0; 665d2a17637SMingming Cao ei->i_allocated_meta_blocks = 0; 666d2a17637SMingming Cao ei->i_delalloc_reserved_flag = 0; 667d2a17637SMingming Cao spin_lock_init(&(ei->i_block_reservation_lock)); 668ac27a0ecSDave Kleikamp return &ei->vfs_inode; 669ac27a0ecSDave Kleikamp } 670ac27a0ecSDave Kleikamp 671617ba13bSMingming Cao static void ext4_destroy_inode(struct inode *inode) 672ac27a0ecSDave Kleikamp { 6739f7dd93dSVasily Averin if (!list_empty(&(EXT4_I(inode)->i_orphan))) { 6749f7dd93dSVasily Averin printk("EXT4 Inode %p: orphan list check failed!\n", 6759f7dd93dSVasily Averin EXT4_I(inode)); 6769f7dd93dSVasily Averin print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, 6779f7dd93dSVasily Averin EXT4_I(inode), sizeof(struct ext4_inode_info), 6789f7dd93dSVasily Averin true); 6799f7dd93dSVasily Averin dump_stack(); 6809f7dd93dSVasily Averin } 681617ba13bSMingming Cao kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); 682ac27a0ecSDave Kleikamp } 683ac27a0ecSDave Kleikamp 68451cc5068SAlexey Dobriyan static void init_once(void *foo) 685ac27a0ecSDave Kleikamp { 686617ba13bSMingming Cao struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; 687ac27a0ecSDave Kleikamp 688ac27a0ecSDave Kleikamp INIT_LIST_HEAD(&ei->i_orphan); 68903010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_XATTR 690ac27a0ecSDave Kleikamp init_rwsem(&ei->xattr_sem); 691ac27a0ecSDave Kleikamp #endif 6920e855ac8SAneesh Kumar K.V init_rwsem(&ei->i_data_sem); 693ac27a0ecSDave Kleikamp inode_init_once(&ei->vfs_inode); 694ac27a0ecSDave Kleikamp } 695ac27a0ecSDave Kleikamp 696ac27a0ecSDave Kleikamp static int init_inodecache(void) 697ac27a0ecSDave Kleikamp { 698617ba13bSMingming Cao ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", 699617ba13bSMingming Cao sizeof(struct ext4_inode_info), 700ac27a0ecSDave Kleikamp 0, (SLAB_RECLAIM_ACCOUNT| 701ac27a0ecSDave Kleikamp SLAB_MEM_SPREAD), 70220c2df83SPaul Mundt init_once); 703617ba13bSMingming Cao if (ext4_inode_cachep == NULL) 704ac27a0ecSDave Kleikamp return -ENOMEM; 705ac27a0ecSDave Kleikamp return 0; 706ac27a0ecSDave Kleikamp } 707ac27a0ecSDave Kleikamp 708ac27a0ecSDave Kleikamp static void destroy_inodecache(void) 709ac27a0ecSDave Kleikamp { 710617ba13bSMingming Cao kmem_cache_destroy(ext4_inode_cachep); 711ac27a0ecSDave Kleikamp } 712ac27a0ecSDave Kleikamp 713617ba13bSMingming Cao static void ext4_clear_inode(struct inode *inode) 714ac27a0ecSDave Kleikamp { 71503010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 716617ba13bSMingming Cao if (EXT4_I(inode)->i_acl && 717617ba13bSMingming Cao EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) { 718617ba13bSMingming Cao posix_acl_release(EXT4_I(inode)->i_acl); 719617ba13bSMingming Cao EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED; 720ac27a0ecSDave Kleikamp } 721617ba13bSMingming Cao if (EXT4_I(inode)->i_default_acl && 722617ba13bSMingming Cao EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) { 723617ba13bSMingming Cao posix_acl_release(EXT4_I(inode)->i_default_acl); 724617ba13bSMingming Cao EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED; 725ac27a0ecSDave Kleikamp } 726ac27a0ecSDave Kleikamp #endif 727c2ea3fdeSTheodore Ts'o ext4_discard_preallocations(inode); 7280390131bSFrank Mayhar if (EXT4_JOURNAL(inode)) 729678aaf48SJan Kara jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal, 730678aaf48SJan Kara &EXT4_I(inode)->jinode); 731ac27a0ecSDave Kleikamp } 732ac27a0ecSDave Kleikamp 7332b2d6d01STheodore Ts'o static inline void ext4_show_quota_options(struct seq_file *seq, 7342b2d6d01STheodore Ts'o struct super_block *sb) 735ac27a0ecSDave Kleikamp { 736ac27a0ecSDave Kleikamp #if defined(CONFIG_QUOTA) 737617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 738ac27a0ecSDave Kleikamp 739ac27a0ecSDave Kleikamp if (sbi->s_jquota_fmt) 740ac27a0ecSDave Kleikamp seq_printf(seq, ",jqfmt=%s", 741ac27a0ecSDave Kleikamp (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold" : "vfsv0"); 742ac27a0ecSDave Kleikamp 743ac27a0ecSDave Kleikamp if (sbi->s_qf_names[USRQUOTA]) 744ac27a0ecSDave Kleikamp seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); 745ac27a0ecSDave Kleikamp 746ac27a0ecSDave Kleikamp if (sbi->s_qf_names[GRPQUOTA]) 747ac27a0ecSDave Kleikamp seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); 748ac27a0ecSDave Kleikamp 749617ba13bSMingming Cao if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) 750ac27a0ecSDave Kleikamp seq_puts(seq, ",usrquota"); 751ac27a0ecSDave Kleikamp 752617ba13bSMingming Cao if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) 753ac27a0ecSDave Kleikamp seq_puts(seq, ",grpquota"); 754ac27a0ecSDave Kleikamp #endif 755ac27a0ecSDave Kleikamp } 756ac27a0ecSDave Kleikamp 757d9c9bef1SMiklos Szeredi /* 758d9c9bef1SMiklos Szeredi * Show an option if 759d9c9bef1SMiklos Szeredi * - it's set to a non-default value OR 760d9c9bef1SMiklos Szeredi * - if the per-sb default is different from the global default 761d9c9bef1SMiklos Szeredi */ 762617ba13bSMingming Cao static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs) 763ac27a0ecSDave Kleikamp { 764aa22df2cSAneesh Kumar K.V int def_errors; 765aa22df2cSAneesh Kumar K.V unsigned long def_mount_opts; 766ac27a0ecSDave Kleikamp struct super_block *sb = vfs->mnt_sb; 767d9c9bef1SMiklos Szeredi struct ext4_sb_info *sbi = EXT4_SB(sb); 768d9c9bef1SMiklos Szeredi struct ext4_super_block *es = sbi->s_es; 769d9c9bef1SMiklos Szeredi 770d9c9bef1SMiklos Szeredi def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 771aa22df2cSAneesh Kumar K.V def_errors = le16_to_cpu(es->s_errors); 772d9c9bef1SMiklos Szeredi 773d9c9bef1SMiklos Szeredi if (sbi->s_sb_block != 1) 774d9c9bef1SMiklos Szeredi seq_printf(seq, ",sb=%llu", sbi->s_sb_block); 775d9c9bef1SMiklos Szeredi if (test_opt(sb, MINIX_DF)) 776d9c9bef1SMiklos Szeredi seq_puts(seq, ",minixdf"); 777aa22df2cSAneesh Kumar K.V if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS)) 778d9c9bef1SMiklos Szeredi seq_puts(seq, ",grpid"); 779d9c9bef1SMiklos Szeredi if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS)) 780d9c9bef1SMiklos Szeredi seq_puts(seq, ",nogrpid"); 781d9c9bef1SMiklos Szeredi if (sbi->s_resuid != EXT4_DEF_RESUID || 782d9c9bef1SMiklos Szeredi le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) { 783d9c9bef1SMiklos Szeredi seq_printf(seq, ",resuid=%u", sbi->s_resuid); 784d9c9bef1SMiklos Szeredi } 785d9c9bef1SMiklos Szeredi if (sbi->s_resgid != EXT4_DEF_RESGID || 786d9c9bef1SMiklos Szeredi le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) { 787d9c9bef1SMiklos Szeredi seq_printf(seq, ",resgid=%u", sbi->s_resgid); 788d9c9bef1SMiklos Szeredi } 789bb4f397aSAneesh Kumar K.V if (test_opt(sb, ERRORS_RO)) { 790d9c9bef1SMiklos Szeredi if (def_errors == EXT4_ERRORS_PANIC || 791bb4f397aSAneesh Kumar K.V def_errors == EXT4_ERRORS_CONTINUE) { 792d9c9bef1SMiklos Szeredi seq_puts(seq, ",errors=remount-ro"); 793bb4f397aSAneesh Kumar K.V } 794bb4f397aSAneesh Kumar K.V } 795aa22df2cSAneesh Kumar K.V if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) 796bb4f397aSAneesh Kumar K.V seq_puts(seq, ",errors=continue"); 797aa22df2cSAneesh Kumar K.V if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) 798d9c9bef1SMiklos Szeredi seq_puts(seq, ",errors=panic"); 799aa22df2cSAneesh Kumar K.V if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16)) 800d9c9bef1SMiklos Szeredi seq_puts(seq, ",nouid32"); 801aa22df2cSAneesh Kumar K.V if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG)) 802d9c9bef1SMiklos Szeredi seq_puts(seq, ",debug"); 803d9c9bef1SMiklos Szeredi if (test_opt(sb, OLDALLOC)) 804d9c9bef1SMiklos Szeredi seq_puts(seq, ",oldalloc"); 80503010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_XATTR 806aa22df2cSAneesh Kumar K.V if (test_opt(sb, XATTR_USER) && 807aa22df2cSAneesh Kumar K.V !(def_mount_opts & EXT4_DEFM_XATTR_USER)) 808d9c9bef1SMiklos Szeredi seq_puts(seq, ",user_xattr"); 809d9c9bef1SMiklos Szeredi if (!test_opt(sb, XATTR_USER) && 810d9c9bef1SMiklos Szeredi (def_mount_opts & EXT4_DEFM_XATTR_USER)) { 811d9c9bef1SMiklos Szeredi seq_puts(seq, ",nouser_xattr"); 812d9c9bef1SMiklos Szeredi } 813d9c9bef1SMiklos Szeredi #endif 81403010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 815aa22df2cSAneesh Kumar K.V if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL)) 816d9c9bef1SMiklos Szeredi seq_puts(seq, ",acl"); 817d9c9bef1SMiklos Szeredi if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL)) 818d9c9bef1SMiklos Szeredi seq_puts(seq, ",noacl"); 819d9c9bef1SMiklos Szeredi #endif 820d9c9bef1SMiklos Szeredi if (!test_opt(sb, RESERVATION)) 821d9c9bef1SMiklos Szeredi seq_puts(seq, ",noreservation"); 82230773840STheodore Ts'o if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) { 823d9c9bef1SMiklos Szeredi seq_printf(seq, ",commit=%u", 824d9c9bef1SMiklos Szeredi (unsigned) (sbi->s_commit_interval / HZ)); 825d9c9bef1SMiklos Szeredi } 82630773840STheodore Ts'o if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) { 82730773840STheodore Ts'o seq_printf(seq, ",min_batch_time=%u", 82830773840STheodore Ts'o (unsigned) sbi->s_min_batch_time); 82930773840STheodore Ts'o } 83030773840STheodore Ts'o if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) { 83130773840STheodore Ts'o seq_printf(seq, ",max_batch_time=%u", 83230773840STheodore Ts'o (unsigned) sbi->s_min_batch_time); 83330773840STheodore Ts'o } 83430773840STheodore Ts'o 835571640caSEric Sandeen /* 836571640caSEric Sandeen * We're changing the default of barrier mount option, so 837571640caSEric Sandeen * let's always display its mount state so it's clear what its 838571640caSEric Sandeen * status is. 839571640caSEric Sandeen */ 840571640caSEric Sandeen seq_puts(seq, ",barrier="); 841571640caSEric Sandeen seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0"); 842cd0b6a39STheodore Ts'o if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) 843cd0b6a39STheodore Ts'o seq_puts(seq, ",journal_async_commit"); 844d9c9bef1SMiklos Szeredi if (test_opt(sb, NOBH)) 845d9c9bef1SMiklos Szeredi seq_puts(seq, ",nobh"); 84625ec56b5SJean Noel Cordenner if (test_opt(sb, I_VERSION)) 84725ec56b5SJean Noel Cordenner seq_puts(seq, ",i_version"); 848dd919b98SAneesh Kumar K.V if (!test_opt(sb, DELALLOC)) 849dd919b98SAneesh Kumar K.V seq_puts(seq, ",nodelalloc"); 850dd919b98SAneesh Kumar K.V 851ac27a0ecSDave Kleikamp 852cb45bbe4SMiklos Szeredi if (sbi->s_stripe) 853cb45bbe4SMiklos Szeredi seq_printf(seq, ",stripe=%lu", sbi->s_stripe); 854aa22df2cSAneesh Kumar K.V /* 855aa22df2cSAneesh Kumar K.V * journal mode get enabled in different ways 856aa22df2cSAneesh Kumar K.V * So just print the value even if we didn't specify it 857aa22df2cSAneesh Kumar K.V */ 858617ba13bSMingming Cao if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 859ac27a0ecSDave Kleikamp seq_puts(seq, ",data=journal"); 860617ba13bSMingming Cao else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 861ac27a0ecSDave Kleikamp seq_puts(seq, ",data=ordered"); 862617ba13bSMingming Cao else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) 863ac27a0ecSDave Kleikamp seq_puts(seq, ",data=writeback"); 864ac27a0ecSDave Kleikamp 865240799cdSTheodore Ts'o if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS) 866240799cdSTheodore Ts'o seq_printf(seq, ",inode_readahead_blks=%u", 867240799cdSTheodore Ts'o sbi->s_inode_readahead_blks); 868240799cdSTheodore Ts'o 8695bf5683aSHidehiro Kawai if (test_opt(sb, DATA_ERR_ABORT)) 8705bf5683aSHidehiro Kawai seq_puts(seq, ",data_err=abort"); 8715bf5683aSHidehiro Kawai 872617ba13bSMingming Cao ext4_show_quota_options(seq, sb); 873ac27a0ecSDave Kleikamp return 0; 874ac27a0ecSDave Kleikamp } 875ac27a0ecSDave Kleikamp 876ac27a0ecSDave Kleikamp 8771b961ac0SChristoph Hellwig static struct inode *ext4_nfs_get_inode(struct super_block *sb, 8781b961ac0SChristoph Hellwig u64 ino, u32 generation) 879ac27a0ecSDave Kleikamp { 880ac27a0ecSDave Kleikamp struct inode *inode; 881ac27a0ecSDave Kleikamp 882617ba13bSMingming Cao if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) 883ac27a0ecSDave Kleikamp return ERR_PTR(-ESTALE); 884617ba13bSMingming Cao if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) 885ac27a0ecSDave Kleikamp return ERR_PTR(-ESTALE); 886ac27a0ecSDave Kleikamp 887ac27a0ecSDave Kleikamp /* iget isn't really right if the inode is currently unallocated!! 888ac27a0ecSDave Kleikamp * 889617ba13bSMingming Cao * ext4_read_inode will return a bad_inode if the inode had been 890ac27a0ecSDave Kleikamp * deleted, so we should be safe. 891ac27a0ecSDave Kleikamp * 892ac27a0ecSDave Kleikamp * Currently we don't know the generation for parent directory, so 893ac27a0ecSDave Kleikamp * a generation of 0 means "accept any" 894ac27a0ecSDave Kleikamp */ 8951d1fe1eeSDavid Howells inode = ext4_iget(sb, ino); 8961d1fe1eeSDavid Howells if (IS_ERR(inode)) 8971d1fe1eeSDavid Howells return ERR_CAST(inode); 8981d1fe1eeSDavid Howells if (generation && inode->i_generation != generation) { 899ac27a0ecSDave Kleikamp iput(inode); 900ac27a0ecSDave Kleikamp return ERR_PTR(-ESTALE); 901ac27a0ecSDave Kleikamp } 9021b961ac0SChristoph Hellwig 9031b961ac0SChristoph Hellwig return inode; 904ac27a0ecSDave Kleikamp } 9051b961ac0SChristoph Hellwig 9061b961ac0SChristoph Hellwig static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, 9071b961ac0SChristoph Hellwig int fh_len, int fh_type) 9081b961ac0SChristoph Hellwig { 9091b961ac0SChristoph Hellwig return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 9101b961ac0SChristoph Hellwig ext4_nfs_get_inode); 9111b961ac0SChristoph Hellwig } 9121b961ac0SChristoph Hellwig 9131b961ac0SChristoph Hellwig static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, 9141b961ac0SChristoph Hellwig int fh_len, int fh_type) 9151b961ac0SChristoph Hellwig { 9161b961ac0SChristoph Hellwig return generic_fh_to_parent(sb, fid, fh_len, fh_type, 9171b961ac0SChristoph Hellwig ext4_nfs_get_inode); 918ac27a0ecSDave Kleikamp } 919ac27a0ecSDave Kleikamp 920c39a7f84SToshiyuki Okajima /* 921c39a7f84SToshiyuki Okajima * Try to release metadata pages (indirect blocks, directories) which are 922c39a7f84SToshiyuki Okajima * mapped via the block device. Since these pages could have journal heads 923c39a7f84SToshiyuki Okajima * which would prevent try_to_free_buffers() from freeing them, we must use 924c39a7f84SToshiyuki Okajima * jbd2 layer's try_to_free_buffers() function to release them. 925c39a7f84SToshiyuki Okajima */ 926c39a7f84SToshiyuki Okajima static int bdev_try_to_free_page(struct super_block *sb, struct page *page, gfp_t wait) 927c39a7f84SToshiyuki Okajima { 928c39a7f84SToshiyuki Okajima journal_t *journal = EXT4_SB(sb)->s_journal; 929c39a7f84SToshiyuki Okajima 930c39a7f84SToshiyuki Okajima WARN_ON(PageChecked(page)); 931c39a7f84SToshiyuki Okajima if (!page_has_buffers(page)) 932c39a7f84SToshiyuki Okajima return 0; 933c39a7f84SToshiyuki Okajima if (journal) 934c39a7f84SToshiyuki Okajima return jbd2_journal_try_to_free_buffers(journal, page, 935c39a7f84SToshiyuki Okajima wait & ~__GFP_WAIT); 936c39a7f84SToshiyuki Okajima return try_to_free_buffers(page); 937c39a7f84SToshiyuki Okajima } 938c39a7f84SToshiyuki Okajima 939ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 940ac27a0ecSDave Kleikamp #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group") 941ac27a0ecSDave Kleikamp #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) 942ac27a0ecSDave Kleikamp 943617ba13bSMingming Cao static int ext4_write_dquot(struct dquot *dquot); 944617ba13bSMingming Cao static int ext4_acquire_dquot(struct dquot *dquot); 945617ba13bSMingming Cao static int ext4_release_dquot(struct dquot *dquot); 946617ba13bSMingming Cao static int ext4_mark_dquot_dirty(struct dquot *dquot); 947617ba13bSMingming Cao static int ext4_write_info(struct super_block *sb, int type); 9486f28e087SJan Kara static int ext4_quota_on(struct super_block *sb, int type, int format_id, 9496f28e087SJan Kara char *path, int remount); 950617ba13bSMingming Cao static int ext4_quota_on_mount(struct super_block *sb, int type); 951617ba13bSMingming Cao static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 952ac27a0ecSDave Kleikamp size_t len, loff_t off); 953617ba13bSMingming Cao static ssize_t ext4_quota_write(struct super_block *sb, int type, 954ac27a0ecSDave Kleikamp const char *data, size_t len, loff_t off); 955ac27a0ecSDave Kleikamp 956617ba13bSMingming Cao static struct dquot_operations ext4_quota_operations = { 957edf72453SJan Kara .initialize = dquot_initialize, 958edf72453SJan Kara .drop = dquot_drop, 959ac27a0ecSDave Kleikamp .alloc_space = dquot_alloc_space, 96060e58e0fSMingming Cao .reserve_space = dquot_reserve_space, 96160e58e0fSMingming Cao .claim_space = dquot_claim_space, 96260e58e0fSMingming Cao .release_rsv = dquot_release_reserved_space, 96360e58e0fSMingming Cao .get_reserved_space = ext4_get_reserved_space, 964ac27a0ecSDave Kleikamp .alloc_inode = dquot_alloc_inode, 965ac27a0ecSDave Kleikamp .free_space = dquot_free_space, 966ac27a0ecSDave Kleikamp .free_inode = dquot_free_inode, 967ac27a0ecSDave Kleikamp .transfer = dquot_transfer, 968617ba13bSMingming Cao .write_dquot = ext4_write_dquot, 969617ba13bSMingming Cao .acquire_dquot = ext4_acquire_dquot, 970617ba13bSMingming Cao .release_dquot = ext4_release_dquot, 971617ba13bSMingming Cao .mark_dirty = ext4_mark_dquot_dirty, 972a5b5ee32SJan Kara .write_info = ext4_write_info, 973a5b5ee32SJan Kara .alloc_dquot = dquot_alloc, 974a5b5ee32SJan Kara .destroy_dquot = dquot_destroy, 975ac27a0ecSDave Kleikamp }; 976ac27a0ecSDave Kleikamp 977617ba13bSMingming Cao static struct quotactl_ops ext4_qctl_operations = { 978617ba13bSMingming Cao .quota_on = ext4_quota_on, 979ac27a0ecSDave Kleikamp .quota_off = vfs_quota_off, 980ac27a0ecSDave Kleikamp .quota_sync = vfs_quota_sync, 981ac27a0ecSDave Kleikamp .get_info = vfs_get_dqinfo, 982ac27a0ecSDave Kleikamp .set_info = vfs_set_dqinfo, 983ac27a0ecSDave Kleikamp .get_dqblk = vfs_get_dqblk, 984ac27a0ecSDave Kleikamp .set_dqblk = vfs_set_dqblk 985ac27a0ecSDave Kleikamp }; 986ac27a0ecSDave Kleikamp #endif 987ac27a0ecSDave Kleikamp 988ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations ext4_sops = { 989617ba13bSMingming Cao .alloc_inode = ext4_alloc_inode, 990617ba13bSMingming Cao .destroy_inode = ext4_destroy_inode, 991617ba13bSMingming Cao .write_inode = ext4_write_inode, 992617ba13bSMingming Cao .dirty_inode = ext4_dirty_inode, 993617ba13bSMingming Cao .delete_inode = ext4_delete_inode, 994617ba13bSMingming Cao .put_super = ext4_put_super, 995617ba13bSMingming Cao .write_super = ext4_write_super, 996617ba13bSMingming Cao .sync_fs = ext4_sync_fs, 997c4be0c1dSTakashi Sato .freeze_fs = ext4_freeze, 998c4be0c1dSTakashi Sato .unfreeze_fs = ext4_unfreeze, 999617ba13bSMingming Cao .statfs = ext4_statfs, 1000617ba13bSMingming Cao .remount_fs = ext4_remount, 1001617ba13bSMingming Cao .clear_inode = ext4_clear_inode, 1002617ba13bSMingming Cao .show_options = ext4_show_options, 1003ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1004617ba13bSMingming Cao .quota_read = ext4_quota_read, 1005617ba13bSMingming Cao .quota_write = ext4_quota_write, 1006ac27a0ecSDave Kleikamp #endif 1007c39a7f84SToshiyuki Okajima .bdev_try_to_free_page = bdev_try_to_free_page, 1008ac27a0ecSDave Kleikamp }; 1009ac27a0ecSDave Kleikamp 101039655164SChristoph Hellwig static const struct export_operations ext4_export_ops = { 10111b961ac0SChristoph Hellwig .fh_to_dentry = ext4_fh_to_dentry, 10121b961ac0SChristoph Hellwig .fh_to_parent = ext4_fh_to_parent, 1013617ba13bSMingming Cao .get_parent = ext4_get_parent, 1014ac27a0ecSDave Kleikamp }; 1015ac27a0ecSDave Kleikamp 1016ac27a0ecSDave Kleikamp enum { 1017ac27a0ecSDave Kleikamp Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 1018ac27a0ecSDave Kleikamp Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, 101901436ef2STheodore Ts'o Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov, 1020ac27a0ecSDave Kleikamp Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, 1021ac27a0ecSDave Kleikamp Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh, 102230773840STheodore Ts'o Opt_commit, Opt_min_batch_time, Opt_max_batch_time, 1023c3191067STheodore Ts'o Opt_journal_update, Opt_journal_dev, 1024818d276cSGirish Shilamkar Opt_journal_checksum, Opt_journal_async_commit, 1025ac27a0ecSDave Kleikamp Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, 10265bf5683aSHidehiro Kawai Opt_data_err_abort, Opt_data_err_ignore, 1027ac27a0ecSDave Kleikamp Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, 1028ac27a0ecSDave Kleikamp Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota, 1029ac27a0ecSDave Kleikamp Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota, 103083982b6fSTheodore Ts'o Opt_grpquota, Opt_i_version, 103101436ef2STheodore Ts'o Opt_stripe, Opt_delalloc, Opt_nodelalloc, 1032b3881f74STheodore Ts'o Opt_inode_readahead_blks, Opt_journal_ioprio 1033ac27a0ecSDave Kleikamp }; 1034ac27a0ecSDave Kleikamp 1035a447c093SSteven Whitehouse static const match_table_t tokens = { 1036ac27a0ecSDave Kleikamp {Opt_bsd_df, "bsddf"}, 1037ac27a0ecSDave Kleikamp {Opt_minix_df, "minixdf"}, 1038ac27a0ecSDave Kleikamp {Opt_grpid, "grpid"}, 1039ac27a0ecSDave Kleikamp {Opt_grpid, "bsdgroups"}, 1040ac27a0ecSDave Kleikamp {Opt_nogrpid, "nogrpid"}, 1041ac27a0ecSDave Kleikamp {Opt_nogrpid, "sysvgroups"}, 1042ac27a0ecSDave Kleikamp {Opt_resgid, "resgid=%u"}, 1043ac27a0ecSDave Kleikamp {Opt_resuid, "resuid=%u"}, 1044ac27a0ecSDave Kleikamp {Opt_sb, "sb=%u"}, 1045ac27a0ecSDave Kleikamp {Opt_err_cont, "errors=continue"}, 1046ac27a0ecSDave Kleikamp {Opt_err_panic, "errors=panic"}, 1047ac27a0ecSDave Kleikamp {Opt_err_ro, "errors=remount-ro"}, 1048ac27a0ecSDave Kleikamp {Opt_nouid32, "nouid32"}, 1049ac27a0ecSDave Kleikamp {Opt_debug, "debug"}, 1050ac27a0ecSDave Kleikamp {Opt_oldalloc, "oldalloc"}, 1051ac27a0ecSDave Kleikamp {Opt_orlov, "orlov"}, 1052ac27a0ecSDave Kleikamp {Opt_user_xattr, "user_xattr"}, 1053ac27a0ecSDave Kleikamp {Opt_nouser_xattr, "nouser_xattr"}, 1054ac27a0ecSDave Kleikamp {Opt_acl, "acl"}, 1055ac27a0ecSDave Kleikamp {Opt_noacl, "noacl"}, 1056ac27a0ecSDave Kleikamp {Opt_reservation, "reservation"}, 1057ac27a0ecSDave Kleikamp {Opt_noreservation, "noreservation"}, 1058ac27a0ecSDave Kleikamp {Opt_noload, "noload"}, 1059ac27a0ecSDave Kleikamp {Opt_nobh, "nobh"}, 1060ac27a0ecSDave Kleikamp {Opt_bh, "bh"}, 1061ac27a0ecSDave Kleikamp {Opt_commit, "commit=%u"}, 106230773840STheodore Ts'o {Opt_min_batch_time, "min_batch_time=%u"}, 106330773840STheodore Ts'o {Opt_max_batch_time, "max_batch_time=%u"}, 1064ac27a0ecSDave Kleikamp {Opt_journal_update, "journal=update"}, 1065ac27a0ecSDave Kleikamp {Opt_journal_dev, "journal_dev=%u"}, 1066818d276cSGirish Shilamkar {Opt_journal_checksum, "journal_checksum"}, 1067818d276cSGirish Shilamkar {Opt_journal_async_commit, "journal_async_commit"}, 1068ac27a0ecSDave Kleikamp {Opt_abort, "abort"}, 1069ac27a0ecSDave Kleikamp {Opt_data_journal, "data=journal"}, 1070ac27a0ecSDave Kleikamp {Opt_data_ordered, "data=ordered"}, 1071ac27a0ecSDave Kleikamp {Opt_data_writeback, "data=writeback"}, 10725bf5683aSHidehiro Kawai {Opt_data_err_abort, "data_err=abort"}, 10735bf5683aSHidehiro Kawai {Opt_data_err_ignore, "data_err=ignore"}, 1074ac27a0ecSDave Kleikamp {Opt_offusrjquota, "usrjquota="}, 1075ac27a0ecSDave Kleikamp {Opt_usrjquota, "usrjquota=%s"}, 1076ac27a0ecSDave Kleikamp {Opt_offgrpjquota, "grpjquota="}, 1077ac27a0ecSDave Kleikamp {Opt_grpjquota, "grpjquota=%s"}, 1078ac27a0ecSDave Kleikamp {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, 1079ac27a0ecSDave Kleikamp {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, 1080ac27a0ecSDave Kleikamp {Opt_grpquota, "grpquota"}, 1081ac27a0ecSDave Kleikamp {Opt_noquota, "noquota"}, 1082ac27a0ecSDave Kleikamp {Opt_quota, "quota"}, 1083ac27a0ecSDave Kleikamp {Opt_usrquota, "usrquota"}, 1084ac27a0ecSDave Kleikamp {Opt_barrier, "barrier=%u"}, 108525ec56b5SJean Noel Cordenner {Opt_i_version, "i_version"}, 1086c9de560dSAlex Tomas {Opt_stripe, "stripe=%u"}, 1087ac27a0ecSDave Kleikamp {Opt_resize, "resize"}, 108864769240SAlex Tomas {Opt_delalloc, "delalloc"}, 1089dd919b98SAneesh Kumar K.V {Opt_nodelalloc, "nodelalloc"}, 1090240799cdSTheodore Ts'o {Opt_inode_readahead_blks, "inode_readahead_blks=%u"}, 1091b3881f74STheodore Ts'o {Opt_journal_ioprio, "journal_ioprio=%u"}, 1092f3f12faaSJosef Bacik {Opt_err, NULL}, 1093ac27a0ecSDave Kleikamp }; 1094ac27a0ecSDave Kleikamp 1095617ba13bSMingming Cao static ext4_fsblk_t get_sb_block(void **data) 1096ac27a0ecSDave Kleikamp { 1097617ba13bSMingming Cao ext4_fsblk_t sb_block; 1098ac27a0ecSDave Kleikamp char *options = (char *) *data; 1099ac27a0ecSDave Kleikamp 1100ac27a0ecSDave Kleikamp if (!options || strncmp(options, "sb=", 3) != 0) 1101ac27a0ecSDave Kleikamp return 1; /* Default location */ 1102ac27a0ecSDave Kleikamp options += 3; 1103617ba13bSMingming Cao /*todo: use simple_strtoll with >32bit ext4 */ 1104ac27a0ecSDave Kleikamp sb_block = simple_strtoul(options, &options, 0); 1105ac27a0ecSDave Kleikamp if (*options && *options != ',') { 11064776004fSTheodore Ts'o printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n", 1107ac27a0ecSDave Kleikamp (char *) *data); 1108ac27a0ecSDave Kleikamp return 1; 1109ac27a0ecSDave Kleikamp } 1110ac27a0ecSDave Kleikamp if (*options == ',') 1111ac27a0ecSDave Kleikamp options++; 1112ac27a0ecSDave Kleikamp *data = (void *) options; 1113ac27a0ecSDave Kleikamp return sb_block; 1114ac27a0ecSDave Kleikamp } 1115ac27a0ecSDave Kleikamp 1116b3881f74STheodore Ts'o #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3)) 1117b3881f74STheodore Ts'o 1118ac27a0ecSDave Kleikamp static int parse_options(char *options, struct super_block *sb, 1119c3191067STheodore Ts'o unsigned long *journal_devnum, 1120b3881f74STheodore Ts'o unsigned int *journal_ioprio, 1121617ba13bSMingming Cao ext4_fsblk_t *n_blocks_count, int is_remount) 1122ac27a0ecSDave Kleikamp { 1123617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 1124ac27a0ecSDave Kleikamp char *p; 1125ac27a0ecSDave Kleikamp substring_t args[MAX_OPT_ARGS]; 1126ac27a0ecSDave Kleikamp int data_opt = 0; 1127ac27a0ecSDave Kleikamp int option; 1128ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1129dfc5d03fSJan Kara int qtype, qfmt; 1130ac27a0ecSDave Kleikamp char *qname; 1131ac27a0ecSDave Kleikamp #endif 1132ac27a0ecSDave Kleikamp 1133ac27a0ecSDave Kleikamp if (!options) 1134ac27a0ecSDave Kleikamp return 1; 1135ac27a0ecSDave Kleikamp 1136ac27a0ecSDave Kleikamp while ((p = strsep(&options, ",")) != NULL) { 1137ac27a0ecSDave Kleikamp int token; 1138ac27a0ecSDave Kleikamp if (!*p) 1139ac27a0ecSDave Kleikamp continue; 1140ac27a0ecSDave Kleikamp 1141ac27a0ecSDave Kleikamp token = match_token(p, tokens, args); 1142ac27a0ecSDave Kleikamp switch (token) { 1143ac27a0ecSDave Kleikamp case Opt_bsd_df: 1144ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, MINIX_DF); 1145ac27a0ecSDave Kleikamp break; 1146ac27a0ecSDave Kleikamp case Opt_minix_df: 1147ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, MINIX_DF); 1148ac27a0ecSDave Kleikamp break; 1149ac27a0ecSDave Kleikamp case Opt_grpid: 1150ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, GRPID); 1151ac27a0ecSDave Kleikamp break; 1152ac27a0ecSDave Kleikamp case Opt_nogrpid: 1153ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, GRPID); 1154ac27a0ecSDave Kleikamp break; 1155ac27a0ecSDave Kleikamp case Opt_resuid: 1156ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 1157ac27a0ecSDave Kleikamp return 0; 1158ac27a0ecSDave Kleikamp sbi->s_resuid = option; 1159ac27a0ecSDave Kleikamp break; 1160ac27a0ecSDave Kleikamp case Opt_resgid: 1161ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 1162ac27a0ecSDave Kleikamp return 0; 1163ac27a0ecSDave Kleikamp sbi->s_resgid = option; 1164ac27a0ecSDave Kleikamp break; 1165ac27a0ecSDave Kleikamp case Opt_sb: 1166ac27a0ecSDave Kleikamp /* handled by get_sb_block() instead of here */ 1167ac27a0ecSDave Kleikamp /* *sb_block = match_int(&args[0]); */ 1168ac27a0ecSDave Kleikamp break; 1169ac27a0ecSDave Kleikamp case Opt_err_panic: 1170ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, ERRORS_CONT); 1171ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, ERRORS_RO); 1172ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, ERRORS_PANIC); 1173ac27a0ecSDave Kleikamp break; 1174ac27a0ecSDave Kleikamp case Opt_err_ro: 1175ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, ERRORS_CONT); 1176ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, ERRORS_PANIC); 1177ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, ERRORS_RO); 1178ac27a0ecSDave Kleikamp break; 1179ac27a0ecSDave Kleikamp case Opt_err_cont: 1180ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, ERRORS_RO); 1181ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, ERRORS_PANIC); 1182ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, ERRORS_CONT); 1183ac27a0ecSDave Kleikamp break; 1184ac27a0ecSDave Kleikamp case Opt_nouid32: 1185ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, NO_UID32); 1186ac27a0ecSDave Kleikamp break; 1187ac27a0ecSDave Kleikamp case Opt_debug: 1188ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, DEBUG); 1189ac27a0ecSDave Kleikamp break; 1190ac27a0ecSDave Kleikamp case Opt_oldalloc: 1191ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, OLDALLOC); 1192ac27a0ecSDave Kleikamp break; 1193ac27a0ecSDave Kleikamp case Opt_orlov: 1194ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, OLDALLOC); 1195ac27a0ecSDave Kleikamp break; 119603010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_XATTR 1197ac27a0ecSDave Kleikamp case Opt_user_xattr: 1198ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, XATTR_USER); 1199ac27a0ecSDave Kleikamp break; 1200ac27a0ecSDave Kleikamp case Opt_nouser_xattr: 1201ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, XATTR_USER); 1202ac27a0ecSDave Kleikamp break; 1203ac27a0ecSDave Kleikamp #else 1204ac27a0ecSDave Kleikamp case Opt_user_xattr: 1205ac27a0ecSDave Kleikamp case Opt_nouser_xattr: 12064776004fSTheodore Ts'o printk(KERN_ERR "EXT4 (no)user_xattr options " 12074776004fSTheodore Ts'o "not supported\n"); 1208ac27a0ecSDave Kleikamp break; 1209ac27a0ecSDave Kleikamp #endif 121003010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 1211ac27a0ecSDave Kleikamp case Opt_acl: 1212ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, POSIX_ACL); 1213ac27a0ecSDave Kleikamp break; 1214ac27a0ecSDave Kleikamp case Opt_noacl: 1215ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, POSIX_ACL); 1216ac27a0ecSDave Kleikamp break; 1217ac27a0ecSDave Kleikamp #else 1218ac27a0ecSDave Kleikamp case Opt_acl: 1219ac27a0ecSDave Kleikamp case Opt_noacl: 12204776004fSTheodore Ts'o printk(KERN_ERR "EXT4 (no)acl options " 12214776004fSTheodore Ts'o "not supported\n"); 1222ac27a0ecSDave Kleikamp break; 1223ac27a0ecSDave Kleikamp #endif 1224ac27a0ecSDave Kleikamp case Opt_reservation: 1225ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, RESERVATION); 1226ac27a0ecSDave Kleikamp break; 1227ac27a0ecSDave Kleikamp case Opt_noreservation: 1228ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, RESERVATION); 1229ac27a0ecSDave Kleikamp break; 1230ac27a0ecSDave Kleikamp case Opt_journal_update: 1231ac27a0ecSDave Kleikamp /* @@@ FIXME */ 1232ac27a0ecSDave Kleikamp /* Eventually we will want to be able to create 1233ac27a0ecSDave Kleikamp a journal file here. For now, only allow the 1234ac27a0ecSDave Kleikamp user to specify an existing inode to be the 1235ac27a0ecSDave Kleikamp journal file. */ 1236ac27a0ecSDave Kleikamp if (is_remount) { 1237617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: cannot specify " 1238ac27a0ecSDave Kleikamp "journal on remount\n"); 1239ac27a0ecSDave Kleikamp return 0; 1240ac27a0ecSDave Kleikamp } 1241ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, UPDATE_JOURNAL); 1242ac27a0ecSDave Kleikamp break; 1243ac27a0ecSDave Kleikamp case Opt_journal_dev: 1244ac27a0ecSDave Kleikamp if (is_remount) { 1245617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: cannot specify " 1246ac27a0ecSDave Kleikamp "journal on remount\n"); 1247ac27a0ecSDave Kleikamp return 0; 1248ac27a0ecSDave Kleikamp } 1249ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 1250ac27a0ecSDave Kleikamp return 0; 1251ac27a0ecSDave Kleikamp *journal_devnum = option; 1252ac27a0ecSDave Kleikamp break; 1253818d276cSGirish Shilamkar case Opt_journal_checksum: 1254818d276cSGirish Shilamkar set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); 1255818d276cSGirish Shilamkar break; 1256818d276cSGirish Shilamkar case Opt_journal_async_commit: 1257818d276cSGirish Shilamkar set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT); 1258818d276cSGirish Shilamkar set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); 1259818d276cSGirish Shilamkar break; 1260ac27a0ecSDave Kleikamp case Opt_noload: 1261ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, NOLOAD); 1262ac27a0ecSDave Kleikamp break; 1263ac27a0ecSDave Kleikamp case Opt_commit: 1264ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 1265ac27a0ecSDave Kleikamp return 0; 1266ac27a0ecSDave Kleikamp if (option < 0) 1267ac27a0ecSDave Kleikamp return 0; 1268ac27a0ecSDave Kleikamp if (option == 0) 1269cd02ff0bSMingming Cao option = JBD2_DEFAULT_MAX_COMMIT_AGE; 1270ac27a0ecSDave Kleikamp sbi->s_commit_interval = HZ * option; 1271ac27a0ecSDave Kleikamp break; 127230773840STheodore Ts'o case Opt_max_batch_time: 127330773840STheodore Ts'o if (match_int(&args[0], &option)) 127430773840STheodore Ts'o return 0; 127530773840STheodore Ts'o if (option < 0) 127630773840STheodore Ts'o return 0; 127730773840STheodore Ts'o if (option == 0) 127830773840STheodore Ts'o option = EXT4_DEF_MAX_BATCH_TIME; 127930773840STheodore Ts'o sbi->s_max_batch_time = option; 128030773840STheodore Ts'o break; 128130773840STheodore Ts'o case Opt_min_batch_time: 128230773840STheodore Ts'o if (match_int(&args[0], &option)) 128330773840STheodore Ts'o return 0; 128430773840STheodore Ts'o if (option < 0) 128530773840STheodore Ts'o return 0; 128630773840STheodore Ts'o sbi->s_min_batch_time = option; 128730773840STheodore Ts'o break; 1288ac27a0ecSDave Kleikamp case Opt_data_journal: 1289617ba13bSMingming Cao data_opt = EXT4_MOUNT_JOURNAL_DATA; 1290ac27a0ecSDave Kleikamp goto datacheck; 1291ac27a0ecSDave Kleikamp case Opt_data_ordered: 1292617ba13bSMingming Cao data_opt = EXT4_MOUNT_ORDERED_DATA; 1293ac27a0ecSDave Kleikamp goto datacheck; 1294ac27a0ecSDave Kleikamp case Opt_data_writeback: 1295617ba13bSMingming Cao data_opt = EXT4_MOUNT_WRITEBACK_DATA; 1296ac27a0ecSDave Kleikamp datacheck: 1297ac27a0ecSDave Kleikamp if (is_remount) { 1298617ba13bSMingming Cao if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS) 1299ac27a0ecSDave Kleikamp != data_opt) { 1300ac27a0ecSDave Kleikamp printk(KERN_ERR 1301617ba13bSMingming Cao "EXT4-fs: cannot change data " 1302ac27a0ecSDave Kleikamp "mode on remount\n"); 1303ac27a0ecSDave Kleikamp return 0; 1304ac27a0ecSDave Kleikamp } 1305ac27a0ecSDave Kleikamp } else { 1306617ba13bSMingming Cao sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS; 1307ac27a0ecSDave Kleikamp sbi->s_mount_opt |= data_opt; 1308ac27a0ecSDave Kleikamp } 1309ac27a0ecSDave Kleikamp break; 13105bf5683aSHidehiro Kawai case Opt_data_err_abort: 13115bf5683aSHidehiro Kawai set_opt(sbi->s_mount_opt, DATA_ERR_ABORT); 13125bf5683aSHidehiro Kawai break; 13135bf5683aSHidehiro Kawai case Opt_data_err_ignore: 13145bf5683aSHidehiro Kawai clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT); 13155bf5683aSHidehiro Kawai break; 1316ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1317ac27a0ecSDave Kleikamp case Opt_usrjquota: 1318ac27a0ecSDave Kleikamp qtype = USRQUOTA; 1319ac27a0ecSDave Kleikamp goto set_qf_name; 1320ac27a0ecSDave Kleikamp case Opt_grpjquota: 1321ac27a0ecSDave Kleikamp qtype = GRPQUOTA; 1322ac27a0ecSDave Kleikamp set_qf_name: 132317bd13b3SJan Kara if (sb_any_quota_loaded(sb) && 1324dfc5d03fSJan Kara !sbi->s_qf_names[qtype]) { 1325ac27a0ecSDave Kleikamp printk(KERN_ERR 13262c8be6b2SJan Kara "EXT4-fs: Cannot change journaled " 1327ac27a0ecSDave Kleikamp "quota options when quota turned on.\n"); 1328ac27a0ecSDave Kleikamp return 0; 1329ac27a0ecSDave Kleikamp } 1330ac27a0ecSDave Kleikamp qname = match_strdup(&args[0]); 1331ac27a0ecSDave Kleikamp if (!qname) { 1332ac27a0ecSDave Kleikamp printk(KERN_ERR 1333617ba13bSMingming Cao "EXT4-fs: not enough memory for " 1334ac27a0ecSDave Kleikamp "storing quotafile name.\n"); 1335ac27a0ecSDave Kleikamp return 0; 1336ac27a0ecSDave Kleikamp } 1337ac27a0ecSDave Kleikamp if (sbi->s_qf_names[qtype] && 1338ac27a0ecSDave Kleikamp strcmp(sbi->s_qf_names[qtype], qname)) { 1339ac27a0ecSDave Kleikamp printk(KERN_ERR 1340617ba13bSMingming Cao "EXT4-fs: %s quota file already " 1341ac27a0ecSDave Kleikamp "specified.\n", QTYPE2NAME(qtype)); 1342ac27a0ecSDave Kleikamp kfree(qname); 1343ac27a0ecSDave Kleikamp return 0; 1344ac27a0ecSDave Kleikamp } 1345ac27a0ecSDave Kleikamp sbi->s_qf_names[qtype] = qname; 1346ac27a0ecSDave Kleikamp if (strchr(sbi->s_qf_names[qtype], '/')) { 1347ac27a0ecSDave Kleikamp printk(KERN_ERR 1348617ba13bSMingming Cao "EXT4-fs: quotafile must be on " 1349ac27a0ecSDave Kleikamp "filesystem root.\n"); 1350ac27a0ecSDave Kleikamp kfree(sbi->s_qf_names[qtype]); 1351ac27a0ecSDave Kleikamp sbi->s_qf_names[qtype] = NULL; 1352ac27a0ecSDave Kleikamp return 0; 1353ac27a0ecSDave Kleikamp } 1354ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, QUOTA); 1355ac27a0ecSDave Kleikamp break; 1356ac27a0ecSDave Kleikamp case Opt_offusrjquota: 1357ac27a0ecSDave Kleikamp qtype = USRQUOTA; 1358ac27a0ecSDave Kleikamp goto clear_qf_name; 1359ac27a0ecSDave Kleikamp case Opt_offgrpjquota: 1360ac27a0ecSDave Kleikamp qtype = GRPQUOTA; 1361ac27a0ecSDave Kleikamp clear_qf_name: 136217bd13b3SJan Kara if (sb_any_quota_loaded(sb) && 1363dfc5d03fSJan Kara sbi->s_qf_names[qtype]) { 1364617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: Cannot change " 13652c8be6b2SJan Kara "journaled quota options when " 1366ac27a0ecSDave Kleikamp "quota turned on.\n"); 1367ac27a0ecSDave Kleikamp return 0; 1368ac27a0ecSDave Kleikamp } 1369ac27a0ecSDave Kleikamp /* 1370ac27a0ecSDave Kleikamp * The space will be released later when all options 1371ac27a0ecSDave Kleikamp * are confirmed to be correct 1372ac27a0ecSDave Kleikamp */ 1373ac27a0ecSDave Kleikamp sbi->s_qf_names[qtype] = NULL; 1374ac27a0ecSDave Kleikamp break; 1375ac27a0ecSDave Kleikamp case Opt_jqfmt_vfsold: 1376dfc5d03fSJan Kara qfmt = QFMT_VFS_OLD; 1377dfc5d03fSJan Kara goto set_qf_format; 1378ac27a0ecSDave Kleikamp case Opt_jqfmt_vfsv0: 1379dfc5d03fSJan Kara qfmt = QFMT_VFS_V0; 1380dfc5d03fSJan Kara set_qf_format: 138117bd13b3SJan Kara if (sb_any_quota_loaded(sb) && 1382dfc5d03fSJan Kara sbi->s_jquota_fmt != qfmt) { 1383dfc5d03fSJan Kara printk(KERN_ERR "EXT4-fs: Cannot change " 1384dfc5d03fSJan Kara "journaled quota options when " 1385dfc5d03fSJan Kara "quota turned on.\n"); 1386dfc5d03fSJan Kara return 0; 1387dfc5d03fSJan Kara } 1388dfc5d03fSJan Kara sbi->s_jquota_fmt = qfmt; 1389ac27a0ecSDave Kleikamp break; 1390ac27a0ecSDave Kleikamp case Opt_quota: 1391ac27a0ecSDave Kleikamp case Opt_usrquota: 1392ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, QUOTA); 1393ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, USRQUOTA); 1394ac27a0ecSDave Kleikamp break; 1395ac27a0ecSDave Kleikamp case Opt_grpquota: 1396ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, QUOTA); 1397ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, GRPQUOTA); 1398ac27a0ecSDave Kleikamp break; 1399ac27a0ecSDave Kleikamp case Opt_noquota: 140017bd13b3SJan Kara if (sb_any_quota_loaded(sb)) { 1401617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: Cannot change quota " 1402ac27a0ecSDave Kleikamp "options when quota turned on.\n"); 1403ac27a0ecSDave Kleikamp return 0; 1404ac27a0ecSDave Kleikamp } 1405ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, QUOTA); 1406ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, USRQUOTA); 1407ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, GRPQUOTA); 1408ac27a0ecSDave Kleikamp break; 1409ac27a0ecSDave Kleikamp #else 1410ac27a0ecSDave Kleikamp case Opt_quota: 1411ac27a0ecSDave Kleikamp case Opt_usrquota: 1412ac27a0ecSDave Kleikamp case Opt_grpquota: 1413cd59e7b9SJan Kara printk(KERN_ERR 1414cd59e7b9SJan Kara "EXT4-fs: quota options not supported.\n"); 1415cd59e7b9SJan Kara break; 1416ac27a0ecSDave Kleikamp case Opt_usrjquota: 1417ac27a0ecSDave Kleikamp case Opt_grpjquota: 1418ac27a0ecSDave Kleikamp case Opt_offusrjquota: 1419ac27a0ecSDave Kleikamp case Opt_offgrpjquota: 1420ac27a0ecSDave Kleikamp case Opt_jqfmt_vfsold: 1421ac27a0ecSDave Kleikamp case Opt_jqfmt_vfsv0: 1422ac27a0ecSDave Kleikamp printk(KERN_ERR 1423cd59e7b9SJan Kara "EXT4-fs: journaled quota options not " 1424ac27a0ecSDave Kleikamp "supported.\n"); 1425ac27a0ecSDave Kleikamp break; 1426ac27a0ecSDave Kleikamp case Opt_noquota: 1427ac27a0ecSDave Kleikamp break; 1428ac27a0ecSDave Kleikamp #endif 1429ac27a0ecSDave Kleikamp case Opt_abort: 1430ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, ABORT); 1431ac27a0ecSDave Kleikamp break; 1432ac27a0ecSDave Kleikamp case Opt_barrier: 1433ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 1434ac27a0ecSDave Kleikamp return 0; 1435ac27a0ecSDave Kleikamp if (option) 1436ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, BARRIER); 1437ac27a0ecSDave Kleikamp else 1438ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, BARRIER); 1439ac27a0ecSDave Kleikamp break; 1440ac27a0ecSDave Kleikamp case Opt_ignore: 1441ac27a0ecSDave Kleikamp break; 1442ac27a0ecSDave Kleikamp case Opt_resize: 1443ac27a0ecSDave Kleikamp if (!is_remount) { 1444617ba13bSMingming Cao printk("EXT4-fs: resize option only available " 1445ac27a0ecSDave Kleikamp "for remount\n"); 1446ac27a0ecSDave Kleikamp return 0; 1447ac27a0ecSDave Kleikamp } 1448ac27a0ecSDave Kleikamp if (match_int(&args[0], &option) != 0) 1449ac27a0ecSDave Kleikamp return 0; 1450ac27a0ecSDave Kleikamp *n_blocks_count = option; 1451ac27a0ecSDave Kleikamp break; 1452ac27a0ecSDave Kleikamp case Opt_nobh: 1453ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, NOBH); 1454ac27a0ecSDave Kleikamp break; 1455ac27a0ecSDave Kleikamp case Opt_bh: 1456ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, NOBH); 1457ac27a0ecSDave Kleikamp break; 145825ec56b5SJean Noel Cordenner case Opt_i_version: 145925ec56b5SJean Noel Cordenner set_opt(sbi->s_mount_opt, I_VERSION); 146025ec56b5SJean Noel Cordenner sb->s_flags |= MS_I_VERSION; 146125ec56b5SJean Noel Cordenner break; 1462dd919b98SAneesh Kumar K.V case Opt_nodelalloc: 1463dd919b98SAneesh Kumar K.V clear_opt(sbi->s_mount_opt, DELALLOC); 1464dd919b98SAneesh Kumar K.V break; 1465c9de560dSAlex Tomas case Opt_stripe: 1466c9de560dSAlex Tomas if (match_int(&args[0], &option)) 1467c9de560dSAlex Tomas return 0; 1468c9de560dSAlex Tomas if (option < 0) 1469c9de560dSAlex Tomas return 0; 1470c9de560dSAlex Tomas sbi->s_stripe = option; 1471c9de560dSAlex Tomas break; 147264769240SAlex Tomas case Opt_delalloc: 147364769240SAlex Tomas set_opt(sbi->s_mount_opt, DELALLOC); 147464769240SAlex Tomas break; 1475240799cdSTheodore Ts'o case Opt_inode_readahead_blks: 1476240799cdSTheodore Ts'o if (match_int(&args[0], &option)) 1477240799cdSTheodore Ts'o return 0; 1478240799cdSTheodore Ts'o if (option < 0 || option > (1 << 30)) 1479240799cdSTheodore Ts'o return 0; 14803197ebdbSTheodore Ts'o if (option & (option - 1)) { 14813197ebdbSTheodore Ts'o printk(KERN_ERR "EXT4-fs: inode_readahead_blks" 14823197ebdbSTheodore Ts'o " must be a power of 2\n"); 14833197ebdbSTheodore Ts'o return 0; 14843197ebdbSTheodore Ts'o } 1485240799cdSTheodore Ts'o sbi->s_inode_readahead_blks = option; 1486240799cdSTheodore Ts'o break; 1487b3881f74STheodore Ts'o case Opt_journal_ioprio: 1488b3881f74STheodore Ts'o if (match_int(&args[0], &option)) 1489b3881f74STheodore Ts'o return 0; 1490b3881f74STheodore Ts'o if (option < 0 || option > 7) 1491b3881f74STheodore Ts'o break; 1492b3881f74STheodore Ts'o *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 1493b3881f74STheodore Ts'o option); 1494b3881f74STheodore Ts'o break; 1495ac27a0ecSDave Kleikamp default: 1496ac27a0ecSDave Kleikamp printk(KERN_ERR 1497617ba13bSMingming Cao "EXT4-fs: Unrecognized mount option \"%s\" " 1498ac27a0ecSDave Kleikamp "or missing value\n", p); 1499ac27a0ecSDave Kleikamp return 0; 1500ac27a0ecSDave Kleikamp } 1501ac27a0ecSDave Kleikamp } 1502ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1503ac27a0ecSDave Kleikamp if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { 1504617ba13bSMingming Cao if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) && 1505ac27a0ecSDave Kleikamp sbi->s_qf_names[USRQUOTA]) 1506ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, USRQUOTA); 1507ac27a0ecSDave Kleikamp 1508617ba13bSMingming Cao if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) && 1509ac27a0ecSDave Kleikamp sbi->s_qf_names[GRPQUOTA]) 1510ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, GRPQUOTA); 1511ac27a0ecSDave Kleikamp 1512ac27a0ecSDave Kleikamp if ((sbi->s_qf_names[USRQUOTA] && 1513617ba13bSMingming Cao (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) || 1514ac27a0ecSDave Kleikamp (sbi->s_qf_names[GRPQUOTA] && 1515617ba13bSMingming Cao (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) { 1516617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: old and new quota " 1517ac27a0ecSDave Kleikamp "format mixing.\n"); 1518ac27a0ecSDave Kleikamp return 0; 1519ac27a0ecSDave Kleikamp } 1520ac27a0ecSDave Kleikamp 1521ac27a0ecSDave Kleikamp if (!sbi->s_jquota_fmt) { 15222c8be6b2SJan Kara printk(KERN_ERR "EXT4-fs: journaled quota format " 1523ac27a0ecSDave Kleikamp "not specified.\n"); 1524ac27a0ecSDave Kleikamp return 0; 1525ac27a0ecSDave Kleikamp } 1526ac27a0ecSDave Kleikamp } else { 1527ac27a0ecSDave Kleikamp if (sbi->s_jquota_fmt) { 15282c8be6b2SJan Kara printk(KERN_ERR "EXT4-fs: journaled quota format " 15292c8be6b2SJan Kara "specified with no journaling " 1530ac27a0ecSDave Kleikamp "enabled.\n"); 1531ac27a0ecSDave Kleikamp return 0; 1532ac27a0ecSDave Kleikamp } 1533ac27a0ecSDave Kleikamp } 1534ac27a0ecSDave Kleikamp #endif 1535ac27a0ecSDave Kleikamp return 1; 1536ac27a0ecSDave Kleikamp } 1537ac27a0ecSDave Kleikamp 1538617ba13bSMingming Cao static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, 1539ac27a0ecSDave Kleikamp int read_only) 1540ac27a0ecSDave Kleikamp { 1541617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 1542ac27a0ecSDave Kleikamp int res = 0; 1543ac27a0ecSDave Kleikamp 1544617ba13bSMingming Cao if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { 1545617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs warning: revision level too high, " 1546ac27a0ecSDave Kleikamp "forcing read-only mode\n"); 1547ac27a0ecSDave Kleikamp res = MS_RDONLY; 1548ac27a0ecSDave Kleikamp } 1549ac27a0ecSDave Kleikamp if (read_only) 1550ac27a0ecSDave Kleikamp return res; 1551617ba13bSMingming Cao if (!(sbi->s_mount_state & EXT4_VALID_FS)) 1552617ba13bSMingming Cao printk(KERN_WARNING "EXT4-fs warning: mounting unchecked fs, " 1553ac27a0ecSDave Kleikamp "running e2fsck is recommended\n"); 1554617ba13bSMingming Cao else if ((sbi->s_mount_state & EXT4_ERROR_FS)) 1555ac27a0ecSDave Kleikamp printk(KERN_WARNING 1556617ba13bSMingming Cao "EXT4-fs warning: mounting fs with errors, " 1557ac27a0ecSDave Kleikamp "running e2fsck is recommended\n"); 1558ac27a0ecSDave Kleikamp else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 1559ac27a0ecSDave Kleikamp le16_to_cpu(es->s_mnt_count) >= 1560ac27a0ecSDave Kleikamp (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 1561ac27a0ecSDave Kleikamp printk(KERN_WARNING 1562617ba13bSMingming Cao "EXT4-fs warning: maximal mount count reached, " 1563ac27a0ecSDave Kleikamp "running e2fsck is recommended\n"); 1564ac27a0ecSDave Kleikamp else if (le32_to_cpu(es->s_checkinterval) && 1565ac27a0ecSDave Kleikamp (le32_to_cpu(es->s_lastcheck) + 1566ac27a0ecSDave Kleikamp le32_to_cpu(es->s_checkinterval) <= get_seconds())) 1567ac27a0ecSDave Kleikamp printk(KERN_WARNING 1568617ba13bSMingming Cao "EXT4-fs warning: checktime reached, " 1569ac27a0ecSDave Kleikamp "running e2fsck is recommended\n"); 15700390131bSFrank Mayhar if (!sbi->s_journal) 1571216c34b2SMarcin Slusarz es->s_state &= cpu_to_le16(~EXT4_VALID_FS); 1572ac27a0ecSDave Kleikamp if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) 1573617ba13bSMingming Cao es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); 1574e8546d06SMarcin Slusarz le16_add_cpu(&es->s_mnt_count, 1); 1575ac27a0ecSDave Kleikamp es->s_mtime = cpu_to_le32(get_seconds()); 1576617ba13bSMingming Cao ext4_update_dynamic_rev(sb); 15770390131bSFrank Mayhar if (sbi->s_journal) 1578617ba13bSMingming Cao EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 1579ac27a0ecSDave Kleikamp 1580617ba13bSMingming Cao ext4_commit_super(sb, es, 1); 1581ac27a0ecSDave Kleikamp if (test_opt(sb, DEBUG)) 1582a9df9a49STheodore Ts'o printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, " 1583ac27a0ecSDave Kleikamp "bpg=%lu, ipg=%lu, mo=%04lx]\n", 1584ac27a0ecSDave Kleikamp sb->s_blocksize, 1585ac27a0ecSDave Kleikamp sbi->s_groups_count, 1586617ba13bSMingming Cao EXT4_BLOCKS_PER_GROUP(sb), 1587617ba13bSMingming Cao EXT4_INODES_PER_GROUP(sb), 1588ac27a0ecSDave Kleikamp sbi->s_mount_opt); 1589ac27a0ecSDave Kleikamp 15900390131bSFrank Mayhar if (EXT4_SB(sb)->s_journal) { 159105496769STheodore Ts'o printk(KERN_INFO "EXT4 FS on %s, %s journal on %s\n", 159205496769STheodore Ts'o sb->s_id, EXT4_SB(sb)->s_journal->j_inode ? "internal" : 159305496769STheodore Ts'o "external", EXT4_SB(sb)->s_journal->j_devname); 15940390131bSFrank Mayhar } else { 15950390131bSFrank Mayhar printk(KERN_INFO "EXT4 FS on %s, no journal\n", sb->s_id); 15960390131bSFrank Mayhar } 1597ac27a0ecSDave Kleikamp return res; 1598ac27a0ecSDave Kleikamp } 1599ac27a0ecSDave Kleikamp 1600772cb7c8SJose R. Santos static int ext4_fill_flex_info(struct super_block *sb) 1601772cb7c8SJose R. Santos { 1602772cb7c8SJose R. Santos struct ext4_sb_info *sbi = EXT4_SB(sb); 1603772cb7c8SJose R. Santos struct ext4_group_desc *gdp = NULL; 1604772cb7c8SJose R. Santos struct buffer_head *bh; 1605772cb7c8SJose R. Santos ext4_group_t flex_group_count; 1606772cb7c8SJose R. Santos ext4_group_t flex_group; 1607772cb7c8SJose R. Santos int groups_per_flex = 0; 1608772cb7c8SJose R. Santos int i; 1609772cb7c8SJose R. Santos 1610772cb7c8SJose R. Santos if (!sbi->s_es->s_log_groups_per_flex) { 1611772cb7c8SJose R. Santos sbi->s_log_groups_per_flex = 0; 1612772cb7c8SJose R. Santos return 1; 1613772cb7c8SJose R. Santos } 1614772cb7c8SJose R. Santos 1615772cb7c8SJose R. Santos sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex; 1616772cb7c8SJose R. Santos groups_per_flex = 1 << sbi->s_log_groups_per_flex; 1617772cb7c8SJose R. Santos 1618c62a11fdSFrederic Bohe /* We allocate both existing and potentially added groups */ 1619c62a11fdSFrederic Bohe flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) + 1620d94e99a6SAneesh Kumar K.V ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) << 1621d94e99a6SAneesh Kumar K.V EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex; 1622ec05e868SLi Zefan sbi->s_flex_groups = kzalloc(flex_group_count * 1623772cb7c8SJose R. Santos sizeof(struct flex_groups), GFP_KERNEL); 1624772cb7c8SJose R. Santos if (sbi->s_flex_groups == NULL) { 1625ec05e868SLi Zefan printk(KERN_ERR "EXT4-fs: not enough memory for " 1626a9df9a49STheodore Ts'o "%u flex groups\n", flex_group_count); 1627772cb7c8SJose R. Santos goto failed; 1628772cb7c8SJose R. Santos } 1629772cb7c8SJose R. Santos 1630772cb7c8SJose R. Santos for (i = 0; i < sbi->s_groups_count; i++) { 1631772cb7c8SJose R. Santos gdp = ext4_get_group_desc(sb, i, &bh); 1632772cb7c8SJose R. Santos 1633772cb7c8SJose R. Santos flex_group = ext4_flex_group(sbi, i); 1634772cb7c8SJose R. Santos sbi->s_flex_groups[flex_group].free_inodes += 1635560671a0SAneesh Kumar K.V ext4_free_inodes_count(sb, gdp); 1636772cb7c8SJose R. Santos sbi->s_flex_groups[flex_group].free_blocks += 1637560671a0SAneesh Kumar K.V ext4_free_blks_count(sb, gdp); 1638772cb7c8SJose R. Santos } 1639772cb7c8SJose R. Santos 1640772cb7c8SJose R. Santos return 1; 1641772cb7c8SJose R. Santos failed: 1642772cb7c8SJose R. Santos return 0; 1643772cb7c8SJose R. Santos } 1644772cb7c8SJose R. Santos 1645717d50e4SAndreas Dilger __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group, 1646717d50e4SAndreas Dilger struct ext4_group_desc *gdp) 1647717d50e4SAndreas Dilger { 1648717d50e4SAndreas Dilger __u16 crc = 0; 1649717d50e4SAndreas Dilger 1650717d50e4SAndreas Dilger if (sbi->s_es->s_feature_ro_compat & 1651717d50e4SAndreas Dilger cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { 1652717d50e4SAndreas Dilger int offset = offsetof(struct ext4_group_desc, bg_checksum); 1653717d50e4SAndreas Dilger __le32 le_group = cpu_to_le32(block_group); 1654717d50e4SAndreas Dilger 1655717d50e4SAndreas Dilger crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); 1656717d50e4SAndreas Dilger crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); 1657717d50e4SAndreas Dilger crc = crc16(crc, (__u8 *)gdp, offset); 1658717d50e4SAndreas Dilger offset += sizeof(gdp->bg_checksum); /* skip checksum */ 1659717d50e4SAndreas Dilger /* for checksum of struct ext4_group_desc do the rest...*/ 1660717d50e4SAndreas Dilger if ((sbi->s_es->s_feature_incompat & 1661717d50e4SAndreas Dilger cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) && 1662717d50e4SAndreas Dilger offset < le16_to_cpu(sbi->s_es->s_desc_size)) 1663717d50e4SAndreas Dilger crc = crc16(crc, (__u8 *)gdp + offset, 1664717d50e4SAndreas Dilger le16_to_cpu(sbi->s_es->s_desc_size) - 1665717d50e4SAndreas Dilger offset); 1666717d50e4SAndreas Dilger } 1667717d50e4SAndreas Dilger 1668717d50e4SAndreas Dilger return cpu_to_le16(crc); 1669717d50e4SAndreas Dilger } 1670717d50e4SAndreas Dilger 1671717d50e4SAndreas Dilger int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group, 1672717d50e4SAndreas Dilger struct ext4_group_desc *gdp) 1673717d50e4SAndreas Dilger { 1674717d50e4SAndreas Dilger if ((sbi->s_es->s_feature_ro_compat & 1675717d50e4SAndreas Dilger cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) && 1676717d50e4SAndreas Dilger (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp))) 1677717d50e4SAndreas Dilger return 0; 1678717d50e4SAndreas Dilger 1679717d50e4SAndreas Dilger return 1; 1680717d50e4SAndreas Dilger } 1681717d50e4SAndreas Dilger 1682ac27a0ecSDave Kleikamp /* Called at mount-time, super-block is locked */ 1683617ba13bSMingming Cao static int ext4_check_descriptors(struct super_block *sb) 1684ac27a0ecSDave Kleikamp { 1685617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 1686617ba13bSMingming Cao ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); 1687617ba13bSMingming Cao ext4_fsblk_t last_block; 1688bd81d8eeSLaurent Vivier ext4_fsblk_t block_bitmap; 1689bd81d8eeSLaurent Vivier ext4_fsblk_t inode_bitmap; 1690bd81d8eeSLaurent Vivier ext4_fsblk_t inode_table; 1691ce421581SJose R. Santos int flexbg_flag = 0; 1692fd2d4291SAvantika Mathur ext4_group_t i; 1693ac27a0ecSDave Kleikamp 1694ce421581SJose R. Santos if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 1695ce421581SJose R. Santos flexbg_flag = 1; 1696ce421581SJose R. Santos 1697617ba13bSMingming Cao ext4_debug("Checking group descriptors"); 1698ac27a0ecSDave Kleikamp 1699197cd65aSAkinobu Mita for (i = 0; i < sbi->s_groups_count; i++) { 1700197cd65aSAkinobu Mita struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); 1701197cd65aSAkinobu Mita 1702ce421581SJose R. Santos if (i == sbi->s_groups_count - 1 || flexbg_flag) 1703bd81d8eeSLaurent Vivier last_block = ext4_blocks_count(sbi->s_es) - 1; 1704ac27a0ecSDave Kleikamp else 1705ac27a0ecSDave Kleikamp last_block = first_block + 1706617ba13bSMingming Cao (EXT4_BLOCKS_PER_GROUP(sb) - 1); 1707ac27a0ecSDave Kleikamp 17088fadc143SAlexandre Ratchov block_bitmap = ext4_block_bitmap(sb, gdp); 17092b2d6d01STheodore Ts'o if (block_bitmap < first_block || block_bitmap > last_block) { 1710c19204b0SJosef Bacik printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " 1711a9df9a49STheodore Ts'o "Block bitmap for group %u not in group " 17125128273aSEric Sesterhenn "(block %llu)!\n", i, block_bitmap); 1713ac27a0ecSDave Kleikamp return 0; 1714ac27a0ecSDave Kleikamp } 17158fadc143SAlexandre Ratchov inode_bitmap = ext4_inode_bitmap(sb, gdp); 17162b2d6d01STheodore Ts'o if (inode_bitmap < first_block || inode_bitmap > last_block) { 1717c19204b0SJosef Bacik printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " 1718a9df9a49STheodore Ts'o "Inode bitmap for group %u not in group " 17195128273aSEric Sesterhenn "(block %llu)!\n", i, inode_bitmap); 1720ac27a0ecSDave Kleikamp return 0; 1721ac27a0ecSDave Kleikamp } 17228fadc143SAlexandre Ratchov inode_table = ext4_inode_table(sb, gdp); 1723bd81d8eeSLaurent Vivier if (inode_table < first_block || 17242b2d6d01STheodore Ts'o inode_table + sbi->s_itb_per_group - 1 > last_block) { 1725c19204b0SJosef Bacik printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " 1726a9df9a49STheodore Ts'o "Inode table for group %u not in group " 17275128273aSEric Sesterhenn "(block %llu)!\n", i, inode_table); 1728ac27a0ecSDave Kleikamp return 0; 1729ac27a0ecSDave Kleikamp } 1730b5f10eedSEric Sandeen spin_lock(sb_bgl_lock(sbi, i)); 1731717d50e4SAndreas Dilger if (!ext4_group_desc_csum_verify(sbi, i, gdp)) { 1732c19204b0SJosef Bacik printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " 1733a9df9a49STheodore Ts'o "Checksum for group %u failed (%u!=%u)\n", 1734fd2d4291SAvantika Mathur i, le16_to_cpu(ext4_group_desc_csum(sbi, i, 1735fd2d4291SAvantika Mathur gdp)), le16_to_cpu(gdp->bg_checksum)); 17367ee1ec4cSLi Zefan if (!(sb->s_flags & MS_RDONLY)) { 17377ee1ec4cSLi Zefan spin_unlock(sb_bgl_lock(sbi, i)); 1738717d50e4SAndreas Dilger return 0; 1739717d50e4SAndreas Dilger } 17407ee1ec4cSLi Zefan } 1741b5f10eedSEric Sandeen spin_unlock(sb_bgl_lock(sbi, i)); 1742ce421581SJose R. Santos if (!flexbg_flag) 1743617ba13bSMingming Cao first_block += EXT4_BLOCKS_PER_GROUP(sb); 1744ac27a0ecSDave Kleikamp } 1745ac27a0ecSDave Kleikamp 1746bd81d8eeSLaurent Vivier ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb)); 1747617ba13bSMingming Cao sbi->s_es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb)); 1748ac27a0ecSDave Kleikamp return 1; 1749ac27a0ecSDave Kleikamp } 1750ac27a0ecSDave Kleikamp 1751617ba13bSMingming Cao /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at 1752ac27a0ecSDave Kleikamp * the superblock) which were deleted from all directories, but held open by 1753ac27a0ecSDave Kleikamp * a process at the time of a crash. We walk the list and try to delete these 1754ac27a0ecSDave Kleikamp * inodes at recovery time (only with a read-write filesystem). 1755ac27a0ecSDave Kleikamp * 1756ac27a0ecSDave Kleikamp * In order to keep the orphan inode chain consistent during traversal (in 1757ac27a0ecSDave Kleikamp * case of crash during recovery), we link each inode into the superblock 1758ac27a0ecSDave Kleikamp * orphan list_head and handle it the same way as an inode deletion during 1759ac27a0ecSDave Kleikamp * normal operation (which journals the operations for us). 1760ac27a0ecSDave Kleikamp * 1761ac27a0ecSDave Kleikamp * We only do an iget() and an iput() on each inode, which is very safe if we 1762ac27a0ecSDave Kleikamp * accidentally point at an in-use or already deleted inode. The worst that 1763ac27a0ecSDave Kleikamp * can happen in this case is that we get a "bit already cleared" message from 1764617ba13bSMingming Cao * ext4_free_inode(). The only reason we would point at a wrong inode is if 1765ac27a0ecSDave Kleikamp * e2fsck was run on this filesystem, and it must have already done the orphan 1766ac27a0ecSDave Kleikamp * inode cleanup for us, so we can safely abort without any further action. 1767ac27a0ecSDave Kleikamp */ 1768617ba13bSMingming Cao static void ext4_orphan_cleanup(struct super_block *sb, 1769617ba13bSMingming Cao struct ext4_super_block *es) 1770ac27a0ecSDave Kleikamp { 1771ac27a0ecSDave Kleikamp unsigned int s_flags = sb->s_flags; 1772ac27a0ecSDave Kleikamp int nr_orphans = 0, nr_truncates = 0; 1773ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1774ac27a0ecSDave Kleikamp int i; 1775ac27a0ecSDave Kleikamp #endif 1776ac27a0ecSDave Kleikamp if (!es->s_last_orphan) { 1777ac27a0ecSDave Kleikamp jbd_debug(4, "no orphan inodes to clean up\n"); 1778ac27a0ecSDave Kleikamp return; 1779ac27a0ecSDave Kleikamp } 1780ac27a0ecSDave Kleikamp 1781a8f48a95SEric Sandeen if (bdev_read_only(sb->s_bdev)) { 1782a8f48a95SEric Sandeen printk(KERN_ERR "EXT4-fs: write access " 1783a8f48a95SEric Sandeen "unavailable, skipping orphan cleanup.\n"); 1784a8f48a95SEric Sandeen return; 1785a8f48a95SEric Sandeen } 1786a8f48a95SEric Sandeen 1787617ba13bSMingming Cao if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { 1788ac27a0ecSDave Kleikamp if (es->s_last_orphan) 1789ac27a0ecSDave Kleikamp jbd_debug(1, "Errors on filesystem, " 1790ac27a0ecSDave Kleikamp "clearing orphan list.\n"); 1791ac27a0ecSDave Kleikamp es->s_last_orphan = 0; 1792ac27a0ecSDave Kleikamp jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); 1793ac27a0ecSDave Kleikamp return; 1794ac27a0ecSDave Kleikamp } 1795ac27a0ecSDave Kleikamp 1796ac27a0ecSDave Kleikamp if (s_flags & MS_RDONLY) { 1797617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n", 1798ac27a0ecSDave Kleikamp sb->s_id); 1799ac27a0ecSDave Kleikamp sb->s_flags &= ~MS_RDONLY; 1800ac27a0ecSDave Kleikamp } 1801ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1802ac27a0ecSDave Kleikamp /* Needed for iput() to work correctly and not trash data */ 1803ac27a0ecSDave Kleikamp sb->s_flags |= MS_ACTIVE; 1804ac27a0ecSDave Kleikamp /* Turn on quotas so that they are updated correctly */ 1805ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) { 1806617ba13bSMingming Cao if (EXT4_SB(sb)->s_qf_names[i]) { 1807617ba13bSMingming Cao int ret = ext4_quota_on_mount(sb, i); 1808ac27a0ecSDave Kleikamp if (ret < 0) 1809ac27a0ecSDave Kleikamp printk(KERN_ERR 18102c8be6b2SJan Kara "EXT4-fs: Cannot turn on journaled " 1811ac27a0ecSDave Kleikamp "quota: error %d\n", ret); 1812ac27a0ecSDave Kleikamp } 1813ac27a0ecSDave Kleikamp } 1814ac27a0ecSDave Kleikamp #endif 1815ac27a0ecSDave Kleikamp 1816ac27a0ecSDave Kleikamp while (es->s_last_orphan) { 1817ac27a0ecSDave Kleikamp struct inode *inode; 1818ac27a0ecSDave Kleikamp 181997bd42b9SJosef Bacik inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); 182097bd42b9SJosef Bacik if (IS_ERR(inode)) { 1821ac27a0ecSDave Kleikamp es->s_last_orphan = 0; 1822ac27a0ecSDave Kleikamp break; 1823ac27a0ecSDave Kleikamp } 1824ac27a0ecSDave Kleikamp 1825617ba13bSMingming Cao list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); 1826*a269eb18SJan Kara vfs_dq_init(inode); 1827ac27a0ecSDave Kleikamp if (inode->i_nlink) { 1828ac27a0ecSDave Kleikamp printk(KERN_DEBUG 1829e5f8eab8STheodore Ts'o "%s: truncating inode %lu to %lld bytes\n", 183046e665e9SHarvey Harrison __func__, inode->i_ino, inode->i_size); 1831e5f8eab8STheodore Ts'o jbd_debug(2, "truncating inode %lu to %lld bytes\n", 1832ac27a0ecSDave Kleikamp inode->i_ino, inode->i_size); 1833617ba13bSMingming Cao ext4_truncate(inode); 1834ac27a0ecSDave Kleikamp nr_truncates++; 1835ac27a0ecSDave Kleikamp } else { 1836ac27a0ecSDave Kleikamp printk(KERN_DEBUG 1837ac27a0ecSDave Kleikamp "%s: deleting unreferenced inode %lu\n", 183846e665e9SHarvey Harrison __func__, inode->i_ino); 1839ac27a0ecSDave Kleikamp jbd_debug(2, "deleting unreferenced inode %lu\n", 1840ac27a0ecSDave Kleikamp inode->i_ino); 1841ac27a0ecSDave Kleikamp nr_orphans++; 1842ac27a0ecSDave Kleikamp } 1843ac27a0ecSDave Kleikamp iput(inode); /* The delete magic happens here! */ 1844ac27a0ecSDave Kleikamp } 1845ac27a0ecSDave Kleikamp 1846ac27a0ecSDave Kleikamp #define PLURAL(x) (x), ((x) == 1) ? "" : "s" 1847ac27a0ecSDave Kleikamp 1848ac27a0ecSDave Kleikamp if (nr_orphans) 1849617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n", 1850ac27a0ecSDave Kleikamp sb->s_id, PLURAL(nr_orphans)); 1851ac27a0ecSDave Kleikamp if (nr_truncates) 1852617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n", 1853ac27a0ecSDave Kleikamp sb->s_id, PLURAL(nr_truncates)); 1854ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1855ac27a0ecSDave Kleikamp /* Turn quotas off */ 1856ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) { 1857ac27a0ecSDave Kleikamp if (sb_dqopt(sb)->files[i]) 18586f28e087SJan Kara vfs_quota_off(sb, i, 0); 1859ac27a0ecSDave Kleikamp } 1860ac27a0ecSDave Kleikamp #endif 1861ac27a0ecSDave Kleikamp sb->s_flags = s_flags; /* Restore MS_RDONLY status */ 1862ac27a0ecSDave Kleikamp } 1863cd2291a4SEric Sandeen /* 1864cd2291a4SEric Sandeen * Maximal extent format file size. 1865cd2291a4SEric Sandeen * Resulting logical blkno at s_maxbytes must fit in our on-disk 1866cd2291a4SEric Sandeen * extent format containers, within a sector_t, and within i_blocks 1867cd2291a4SEric Sandeen * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, 1868cd2291a4SEric Sandeen * so that won't be a limiting factor. 1869cd2291a4SEric Sandeen * 1870cd2291a4SEric Sandeen * Note, this does *not* consider any metadata overhead for vfs i_blocks. 1871cd2291a4SEric Sandeen */ 1872f287a1a5STheodore Ts'o static loff_t ext4_max_size(int blkbits, int has_huge_files) 1873cd2291a4SEric Sandeen { 1874cd2291a4SEric Sandeen loff_t res; 1875cd2291a4SEric Sandeen loff_t upper_limit = MAX_LFS_FILESIZE; 1876cd2291a4SEric Sandeen 1877cd2291a4SEric Sandeen /* small i_blocks in vfs inode? */ 1878f287a1a5STheodore Ts'o if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { 1879cd2291a4SEric Sandeen /* 1880b3a6ffe1SJens Axboe * CONFIG_LBD is not enabled implies the inode 1881cd2291a4SEric Sandeen * i_block represent total blocks in 512 bytes 1882cd2291a4SEric Sandeen * 32 == size of vfs inode i_blocks * 8 1883cd2291a4SEric Sandeen */ 1884cd2291a4SEric Sandeen upper_limit = (1LL << 32) - 1; 1885cd2291a4SEric Sandeen 1886cd2291a4SEric Sandeen /* total blocks in file system block size */ 1887cd2291a4SEric Sandeen upper_limit >>= (blkbits - 9); 1888cd2291a4SEric Sandeen upper_limit <<= blkbits; 1889cd2291a4SEric Sandeen } 1890cd2291a4SEric Sandeen 1891cd2291a4SEric Sandeen /* 32-bit extent-start container, ee_block */ 1892cd2291a4SEric Sandeen res = 1LL << 32; 1893cd2291a4SEric Sandeen res <<= blkbits; 1894cd2291a4SEric Sandeen res -= 1; 1895cd2291a4SEric Sandeen 1896cd2291a4SEric Sandeen /* Sanity check against vm- & vfs- imposed limits */ 1897cd2291a4SEric Sandeen if (res > upper_limit) 1898cd2291a4SEric Sandeen res = upper_limit; 1899cd2291a4SEric Sandeen 1900cd2291a4SEric Sandeen return res; 1901cd2291a4SEric Sandeen } 1902ac27a0ecSDave Kleikamp 1903ac27a0ecSDave Kleikamp /* 1904cd2291a4SEric Sandeen * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect 19050fc1b451SAneesh Kumar K.V * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. 19060fc1b451SAneesh Kumar K.V * We need to be 1 filesystem block less than the 2^48 sector limit. 1907ac27a0ecSDave Kleikamp */ 1908f287a1a5STheodore Ts'o static loff_t ext4_max_bitmap_size(int bits, int has_huge_files) 1909ac27a0ecSDave Kleikamp { 1910617ba13bSMingming Cao loff_t res = EXT4_NDIR_BLOCKS; 19110fc1b451SAneesh Kumar K.V int meta_blocks; 19120fc1b451SAneesh Kumar K.V loff_t upper_limit; 19130fc1b451SAneesh Kumar K.V /* This is calculated to be the largest file size for a 1914cd2291a4SEric Sandeen * dense, bitmapped file such that the total number of 1915ac27a0ecSDave Kleikamp * sectors in the file, including data and all indirect blocks, 19160fc1b451SAneesh Kumar K.V * does not exceed 2^48 -1 19170fc1b451SAneesh Kumar K.V * __u32 i_blocks_lo and _u16 i_blocks_high representing the 19180fc1b451SAneesh Kumar K.V * total number of 512 bytes blocks of the file 19190fc1b451SAneesh Kumar K.V */ 19200fc1b451SAneesh Kumar K.V 1921f287a1a5STheodore Ts'o if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { 19220fc1b451SAneesh Kumar K.V /* 1923b3a6ffe1SJens Axboe * !has_huge_files or CONFIG_LBD is not enabled 1924f287a1a5STheodore Ts'o * implies the inode i_block represent total blocks in 1925f287a1a5STheodore Ts'o * 512 bytes 32 == size of vfs inode i_blocks * 8 19260fc1b451SAneesh Kumar K.V */ 19270fc1b451SAneesh Kumar K.V upper_limit = (1LL << 32) - 1; 19280fc1b451SAneesh Kumar K.V 19290fc1b451SAneesh Kumar K.V /* total blocks in file system block size */ 19300fc1b451SAneesh Kumar K.V upper_limit >>= (bits - 9); 19310fc1b451SAneesh Kumar K.V 19320fc1b451SAneesh Kumar K.V } else { 19338180a562SAneesh Kumar K.V /* 19348180a562SAneesh Kumar K.V * We use 48 bit ext4_inode i_blocks 19358180a562SAneesh Kumar K.V * With EXT4_HUGE_FILE_FL set the i_blocks 19368180a562SAneesh Kumar K.V * represent total number of blocks in 19378180a562SAneesh Kumar K.V * file system block size 19388180a562SAneesh Kumar K.V */ 19390fc1b451SAneesh Kumar K.V upper_limit = (1LL << 48) - 1; 19400fc1b451SAneesh Kumar K.V 19410fc1b451SAneesh Kumar K.V } 19420fc1b451SAneesh Kumar K.V 19430fc1b451SAneesh Kumar K.V /* indirect blocks */ 19440fc1b451SAneesh Kumar K.V meta_blocks = 1; 19450fc1b451SAneesh Kumar K.V /* double indirect blocks */ 19460fc1b451SAneesh Kumar K.V meta_blocks += 1 + (1LL << (bits-2)); 19470fc1b451SAneesh Kumar K.V /* tripple indirect blocks */ 19480fc1b451SAneesh Kumar K.V meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); 19490fc1b451SAneesh Kumar K.V 19500fc1b451SAneesh Kumar K.V upper_limit -= meta_blocks; 19510fc1b451SAneesh Kumar K.V upper_limit <<= bits; 1952ac27a0ecSDave Kleikamp 1953ac27a0ecSDave Kleikamp res += 1LL << (bits-2); 1954ac27a0ecSDave Kleikamp res += 1LL << (2*(bits-2)); 1955ac27a0ecSDave Kleikamp res += 1LL << (3*(bits-2)); 1956ac27a0ecSDave Kleikamp res <<= bits; 1957ac27a0ecSDave Kleikamp if (res > upper_limit) 1958ac27a0ecSDave Kleikamp res = upper_limit; 19590fc1b451SAneesh Kumar K.V 19600fc1b451SAneesh Kumar K.V if (res > MAX_LFS_FILESIZE) 19610fc1b451SAneesh Kumar K.V res = MAX_LFS_FILESIZE; 19620fc1b451SAneesh Kumar K.V 1963ac27a0ecSDave Kleikamp return res; 1964ac27a0ecSDave Kleikamp } 1965ac27a0ecSDave Kleikamp 1966617ba13bSMingming Cao static ext4_fsblk_t descriptor_loc(struct super_block *sb, 196770bbb3e0SAndrew Morton ext4_fsblk_t logical_sb_block, int nr) 1968ac27a0ecSDave Kleikamp { 1969617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 1970fd2d4291SAvantika Mathur ext4_group_t bg, first_meta_bg; 1971ac27a0ecSDave Kleikamp int has_super = 0; 1972ac27a0ecSDave Kleikamp 1973ac27a0ecSDave Kleikamp first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 1974ac27a0ecSDave Kleikamp 1975617ba13bSMingming Cao if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || 1976ac27a0ecSDave Kleikamp nr < first_meta_bg) 197770bbb3e0SAndrew Morton return logical_sb_block + nr + 1; 1978ac27a0ecSDave Kleikamp bg = sbi->s_desc_per_block * nr; 1979617ba13bSMingming Cao if (ext4_bg_has_super(sb, bg)) 1980ac27a0ecSDave Kleikamp has_super = 1; 1981617ba13bSMingming Cao return (has_super + ext4_group_first_block_no(sb, bg)); 1982ac27a0ecSDave Kleikamp } 1983ac27a0ecSDave Kleikamp 1984c9de560dSAlex Tomas /** 1985c9de560dSAlex Tomas * ext4_get_stripe_size: Get the stripe size. 1986c9de560dSAlex Tomas * @sbi: In memory super block info 1987c9de560dSAlex Tomas * 1988c9de560dSAlex Tomas * If we have specified it via mount option, then 1989c9de560dSAlex Tomas * use the mount option value. If the value specified at mount time is 1990c9de560dSAlex Tomas * greater than the blocks per group use the super block value. 1991c9de560dSAlex Tomas * If the super block value is greater than blocks per group return 0. 1992c9de560dSAlex Tomas * Allocator needs it be less than blocks per group. 1993c9de560dSAlex Tomas * 1994c9de560dSAlex Tomas */ 1995c9de560dSAlex Tomas static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) 1996c9de560dSAlex Tomas { 1997c9de560dSAlex Tomas unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); 1998c9de560dSAlex Tomas unsigned long stripe_width = 1999c9de560dSAlex Tomas le32_to_cpu(sbi->s_es->s_raid_stripe_width); 2000c9de560dSAlex Tomas 2001c9de560dSAlex Tomas if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) 2002c9de560dSAlex Tomas return sbi->s_stripe; 2003c9de560dSAlex Tomas 2004c9de560dSAlex Tomas if (stripe_width <= sbi->s_blocks_per_group) 2005c9de560dSAlex Tomas return stripe_width; 2006c9de560dSAlex Tomas 2007c9de560dSAlex Tomas if (stride <= sbi->s_blocks_per_group) 2008c9de560dSAlex Tomas return stride; 2009c9de560dSAlex Tomas 2010c9de560dSAlex Tomas return 0; 2011c9de560dSAlex Tomas } 2012ac27a0ecSDave Kleikamp 20133197ebdbSTheodore Ts'o /* sysfs supprt */ 20143197ebdbSTheodore Ts'o 20153197ebdbSTheodore Ts'o struct ext4_attr { 20163197ebdbSTheodore Ts'o struct attribute attr; 20173197ebdbSTheodore Ts'o ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *); 20183197ebdbSTheodore Ts'o ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *, 20193197ebdbSTheodore Ts'o const char *, size_t); 20203197ebdbSTheodore Ts'o int offset; 20213197ebdbSTheodore Ts'o }; 20223197ebdbSTheodore Ts'o 20233197ebdbSTheodore Ts'o static int parse_strtoul(const char *buf, 20243197ebdbSTheodore Ts'o unsigned long max, unsigned long *value) 20253197ebdbSTheodore Ts'o { 20263197ebdbSTheodore Ts'o char *endp; 20273197ebdbSTheodore Ts'o 20283197ebdbSTheodore Ts'o while (*buf && isspace(*buf)) 20293197ebdbSTheodore Ts'o buf++; 20303197ebdbSTheodore Ts'o *value = simple_strtoul(buf, &endp, 0); 20313197ebdbSTheodore Ts'o while (*endp && isspace(*endp)) 20323197ebdbSTheodore Ts'o endp++; 20333197ebdbSTheodore Ts'o if (*endp || *value > max) 20343197ebdbSTheodore Ts'o return -EINVAL; 20353197ebdbSTheodore Ts'o 20363197ebdbSTheodore Ts'o return 0; 20373197ebdbSTheodore Ts'o } 20383197ebdbSTheodore Ts'o 20393197ebdbSTheodore Ts'o static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a, 20403197ebdbSTheodore Ts'o struct ext4_sb_info *sbi, 20413197ebdbSTheodore Ts'o char *buf) 20423197ebdbSTheodore Ts'o { 20433197ebdbSTheodore Ts'o return snprintf(buf, PAGE_SIZE, "%llu\n", 20443197ebdbSTheodore Ts'o (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter)); 20453197ebdbSTheodore Ts'o } 20463197ebdbSTheodore Ts'o 20473197ebdbSTheodore Ts'o static ssize_t session_write_kbytes_show(struct ext4_attr *a, 20483197ebdbSTheodore Ts'o struct ext4_sb_info *sbi, char *buf) 20493197ebdbSTheodore Ts'o { 20503197ebdbSTheodore Ts'o struct super_block *sb = sbi->s_buddy_cache->i_sb; 20513197ebdbSTheodore Ts'o 20523197ebdbSTheodore Ts'o return snprintf(buf, PAGE_SIZE, "%lu\n", 20533197ebdbSTheodore Ts'o (part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 20543197ebdbSTheodore Ts'o sbi->s_sectors_written_start) >> 1); 20553197ebdbSTheodore Ts'o } 20563197ebdbSTheodore Ts'o 20573197ebdbSTheodore Ts'o static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a, 20583197ebdbSTheodore Ts'o struct ext4_sb_info *sbi, char *buf) 20593197ebdbSTheodore Ts'o { 20603197ebdbSTheodore Ts'o struct super_block *sb = sbi->s_buddy_cache->i_sb; 20613197ebdbSTheodore Ts'o 20623197ebdbSTheodore Ts'o return snprintf(buf, PAGE_SIZE, "%llu\n", 20633197ebdbSTheodore Ts'o sbi->s_kbytes_written + 20643197ebdbSTheodore Ts'o ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 20653197ebdbSTheodore Ts'o EXT4_SB(sb)->s_sectors_written_start) >> 1)); 20663197ebdbSTheodore Ts'o } 20673197ebdbSTheodore Ts'o 20683197ebdbSTheodore Ts'o static ssize_t inode_readahead_blks_store(struct ext4_attr *a, 20693197ebdbSTheodore Ts'o struct ext4_sb_info *sbi, 20703197ebdbSTheodore Ts'o const char *buf, size_t count) 20713197ebdbSTheodore Ts'o { 20723197ebdbSTheodore Ts'o unsigned long t; 20733197ebdbSTheodore Ts'o 20743197ebdbSTheodore Ts'o if (parse_strtoul(buf, 0x40000000, &t)) 20753197ebdbSTheodore Ts'o return -EINVAL; 20763197ebdbSTheodore Ts'o 20773197ebdbSTheodore Ts'o /* inode_readahead_blks must be a power of 2 */ 20783197ebdbSTheodore Ts'o if (t & (t-1)) 20793197ebdbSTheodore Ts'o return -EINVAL; 20803197ebdbSTheodore Ts'o 20813197ebdbSTheodore Ts'o sbi->s_inode_readahead_blks = t; 20823197ebdbSTheodore Ts'o return count; 20833197ebdbSTheodore Ts'o } 20843197ebdbSTheodore Ts'o 20853197ebdbSTheodore Ts'o static ssize_t sbi_ui_show(struct ext4_attr *a, 20863197ebdbSTheodore Ts'o struct ext4_sb_info *sbi, char *buf) 20873197ebdbSTheodore Ts'o { 20883197ebdbSTheodore Ts'o unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset); 20893197ebdbSTheodore Ts'o 20903197ebdbSTheodore Ts'o return snprintf(buf, PAGE_SIZE, "%u\n", *ui); 20913197ebdbSTheodore Ts'o } 20923197ebdbSTheodore Ts'o 20933197ebdbSTheodore Ts'o static ssize_t sbi_ui_store(struct ext4_attr *a, 20943197ebdbSTheodore Ts'o struct ext4_sb_info *sbi, 20953197ebdbSTheodore Ts'o const char *buf, size_t count) 20963197ebdbSTheodore Ts'o { 20973197ebdbSTheodore Ts'o unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset); 20983197ebdbSTheodore Ts'o unsigned long t; 20993197ebdbSTheodore Ts'o 21003197ebdbSTheodore Ts'o if (parse_strtoul(buf, 0xffffffff, &t)) 21013197ebdbSTheodore Ts'o return -EINVAL; 21023197ebdbSTheodore Ts'o *ui = t; 21033197ebdbSTheodore Ts'o return count; 21043197ebdbSTheodore Ts'o } 21053197ebdbSTheodore Ts'o 21063197ebdbSTheodore Ts'o #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \ 21073197ebdbSTheodore Ts'o static struct ext4_attr ext4_attr_##_name = { \ 21083197ebdbSTheodore Ts'o .attr = {.name = __stringify(_name), .mode = _mode }, \ 21093197ebdbSTheodore Ts'o .show = _show, \ 21103197ebdbSTheodore Ts'o .store = _store, \ 21113197ebdbSTheodore Ts'o .offset = offsetof(struct ext4_sb_info, _elname), \ 21123197ebdbSTheodore Ts'o } 21133197ebdbSTheodore Ts'o #define EXT4_ATTR(name, mode, show, store) \ 21143197ebdbSTheodore Ts'o static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store) 21153197ebdbSTheodore Ts'o 21163197ebdbSTheodore Ts'o #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL) 21173197ebdbSTheodore Ts'o #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store) 21183197ebdbSTheodore Ts'o #define EXT4_RW_ATTR_SBI_UI(name, elname) \ 21193197ebdbSTheodore Ts'o EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname) 21203197ebdbSTheodore Ts'o #define ATTR_LIST(name) &ext4_attr_##name.attr 21213197ebdbSTheodore Ts'o 21223197ebdbSTheodore Ts'o EXT4_RO_ATTR(delayed_allocation_blocks); 21233197ebdbSTheodore Ts'o EXT4_RO_ATTR(session_write_kbytes); 21243197ebdbSTheodore Ts'o EXT4_RO_ATTR(lifetime_write_kbytes); 21253197ebdbSTheodore Ts'o EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show, 21263197ebdbSTheodore Ts'o inode_readahead_blks_store, s_inode_readahead_blks); 21273197ebdbSTheodore Ts'o EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats); 21283197ebdbSTheodore Ts'o EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan); 21293197ebdbSTheodore Ts'o EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan); 21303197ebdbSTheodore Ts'o EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs); 21313197ebdbSTheodore Ts'o EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request); 21323197ebdbSTheodore Ts'o EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc); 21333197ebdbSTheodore Ts'o 21343197ebdbSTheodore Ts'o static struct attribute *ext4_attrs[] = { 21353197ebdbSTheodore Ts'o ATTR_LIST(delayed_allocation_blocks), 21363197ebdbSTheodore Ts'o ATTR_LIST(session_write_kbytes), 21373197ebdbSTheodore Ts'o ATTR_LIST(lifetime_write_kbytes), 21383197ebdbSTheodore Ts'o ATTR_LIST(inode_readahead_blks), 21393197ebdbSTheodore Ts'o ATTR_LIST(mb_stats), 21403197ebdbSTheodore Ts'o ATTR_LIST(mb_max_to_scan), 21413197ebdbSTheodore Ts'o ATTR_LIST(mb_min_to_scan), 21423197ebdbSTheodore Ts'o ATTR_LIST(mb_order2_req), 21433197ebdbSTheodore Ts'o ATTR_LIST(mb_stream_req), 21443197ebdbSTheodore Ts'o ATTR_LIST(mb_group_prealloc), 21453197ebdbSTheodore Ts'o NULL, 21463197ebdbSTheodore Ts'o }; 21473197ebdbSTheodore Ts'o 21483197ebdbSTheodore Ts'o static ssize_t ext4_attr_show(struct kobject *kobj, 21493197ebdbSTheodore Ts'o struct attribute *attr, char *buf) 21503197ebdbSTheodore Ts'o { 21513197ebdbSTheodore Ts'o struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 21523197ebdbSTheodore Ts'o s_kobj); 21533197ebdbSTheodore Ts'o struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); 21543197ebdbSTheodore Ts'o 21553197ebdbSTheodore Ts'o return a->show ? a->show(a, sbi, buf) : 0; 21563197ebdbSTheodore Ts'o } 21573197ebdbSTheodore Ts'o 21583197ebdbSTheodore Ts'o static ssize_t ext4_attr_store(struct kobject *kobj, 21593197ebdbSTheodore Ts'o struct attribute *attr, 21603197ebdbSTheodore Ts'o const char *buf, size_t len) 21613197ebdbSTheodore Ts'o { 21623197ebdbSTheodore Ts'o struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 21633197ebdbSTheodore Ts'o s_kobj); 21643197ebdbSTheodore Ts'o struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); 21653197ebdbSTheodore Ts'o 21663197ebdbSTheodore Ts'o return a->store ? a->store(a, sbi, buf, len) : 0; 21673197ebdbSTheodore Ts'o } 21683197ebdbSTheodore Ts'o 21693197ebdbSTheodore Ts'o static void ext4_sb_release(struct kobject *kobj) 21703197ebdbSTheodore Ts'o { 21713197ebdbSTheodore Ts'o struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 21723197ebdbSTheodore Ts'o s_kobj); 21733197ebdbSTheodore Ts'o complete(&sbi->s_kobj_unregister); 21743197ebdbSTheodore Ts'o } 21753197ebdbSTheodore Ts'o 21763197ebdbSTheodore Ts'o 21773197ebdbSTheodore Ts'o static struct sysfs_ops ext4_attr_ops = { 21783197ebdbSTheodore Ts'o .show = ext4_attr_show, 21793197ebdbSTheodore Ts'o .store = ext4_attr_store, 21803197ebdbSTheodore Ts'o }; 21813197ebdbSTheodore Ts'o 21823197ebdbSTheodore Ts'o static struct kobj_type ext4_ktype = { 21833197ebdbSTheodore Ts'o .default_attrs = ext4_attrs, 21843197ebdbSTheodore Ts'o .sysfs_ops = &ext4_attr_ops, 21853197ebdbSTheodore Ts'o .release = ext4_sb_release, 21863197ebdbSTheodore Ts'o }; 21873197ebdbSTheodore Ts'o 2188617ba13bSMingming Cao static int ext4_fill_super(struct super_block *sb, void *data, int silent) 21897477827fSAneesh Kumar K.V __releases(kernel_lock) 21907477827fSAneesh Kumar K.V __acquires(kernel_lock) 21911d03ec98SAneesh Kumar K.V 2192ac27a0ecSDave Kleikamp { 2193ac27a0ecSDave Kleikamp struct buffer_head *bh; 2194617ba13bSMingming Cao struct ext4_super_block *es = NULL; 2195617ba13bSMingming Cao struct ext4_sb_info *sbi; 2196617ba13bSMingming Cao ext4_fsblk_t block; 2197617ba13bSMingming Cao ext4_fsblk_t sb_block = get_sb_block(&data); 219870bbb3e0SAndrew Morton ext4_fsblk_t logical_sb_block; 2199ac27a0ecSDave Kleikamp unsigned long offset = 0; 2200ac27a0ecSDave Kleikamp unsigned long journal_devnum = 0; 2201ac27a0ecSDave Kleikamp unsigned long def_mount_opts; 2202ac27a0ecSDave Kleikamp struct inode *root; 22039f6200bbSTheodore Ts'o char *cp; 22040390131bSFrank Mayhar const char *descr; 22051d1fe1eeSDavid Howells int ret = -EINVAL; 2206ac27a0ecSDave Kleikamp int blocksize; 22074ec11028STheodore Ts'o unsigned int db_count; 22084ec11028STheodore Ts'o unsigned int i; 2209f287a1a5STheodore Ts'o int needs_recovery, has_huge_files; 22103a06d778SAneesh Kumar K.V int features; 2211bd81d8eeSLaurent Vivier __u64 blocks_count; 2212833f4077SPeter Zijlstra int err; 2213b3881f74STheodore Ts'o unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; 2214ac27a0ecSDave Kleikamp 2215ac27a0ecSDave Kleikamp sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 2216ac27a0ecSDave Kleikamp if (!sbi) 2217ac27a0ecSDave Kleikamp return -ENOMEM; 2218705895b6SPekka Enberg 2219705895b6SPekka Enberg sbi->s_blockgroup_lock = 2220705895b6SPekka Enberg kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); 2221705895b6SPekka Enberg if (!sbi->s_blockgroup_lock) { 2222705895b6SPekka Enberg kfree(sbi); 2223705895b6SPekka Enberg return -ENOMEM; 2224705895b6SPekka Enberg } 2225ac27a0ecSDave Kleikamp sb->s_fs_info = sbi; 2226ac27a0ecSDave Kleikamp sbi->s_mount_opt = 0; 2227617ba13bSMingming Cao sbi->s_resuid = EXT4_DEF_RESUID; 2228617ba13bSMingming Cao sbi->s_resgid = EXT4_DEF_RESGID; 2229240799cdSTheodore Ts'o sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS; 2230d9c9bef1SMiklos Szeredi sbi->s_sb_block = sb_block; 2231afc32f7eSTheodore Ts'o sbi->s_sectors_written_start = part_stat_read(sb->s_bdev->bd_part, 2232afc32f7eSTheodore Ts'o sectors[1]); 2233ac27a0ecSDave Kleikamp 2234ac27a0ecSDave Kleikamp unlock_kernel(); 2235ac27a0ecSDave Kleikamp 22369f6200bbSTheodore Ts'o /* Cleanup superblock name */ 22379f6200bbSTheodore Ts'o for (cp = sb->s_id; (cp = strchr(cp, '/'));) 22389f6200bbSTheodore Ts'o *cp = '!'; 22399f6200bbSTheodore Ts'o 2240617ba13bSMingming Cao blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); 2241ac27a0ecSDave Kleikamp if (!blocksize) { 2242617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: unable to set blocksize\n"); 2243ac27a0ecSDave Kleikamp goto out_fail; 2244ac27a0ecSDave Kleikamp } 2245ac27a0ecSDave Kleikamp 2246ac27a0ecSDave Kleikamp /* 2247617ba13bSMingming Cao * The ext4 superblock will not be buffer aligned for other than 1kB 2248ac27a0ecSDave Kleikamp * block sizes. We need to calculate the offset from buffer start. 2249ac27a0ecSDave Kleikamp */ 2250617ba13bSMingming Cao if (blocksize != EXT4_MIN_BLOCK_SIZE) { 225170bbb3e0SAndrew Morton logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 225270bbb3e0SAndrew Morton offset = do_div(logical_sb_block, blocksize); 2253ac27a0ecSDave Kleikamp } else { 225470bbb3e0SAndrew Morton logical_sb_block = sb_block; 2255ac27a0ecSDave Kleikamp } 2256ac27a0ecSDave Kleikamp 225770bbb3e0SAndrew Morton if (!(bh = sb_bread(sb, logical_sb_block))) { 2258617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: unable to read superblock\n"); 2259ac27a0ecSDave Kleikamp goto out_fail; 2260ac27a0ecSDave Kleikamp } 2261ac27a0ecSDave Kleikamp /* 2262ac27a0ecSDave Kleikamp * Note: s_es must be initialized as soon as possible because 2263617ba13bSMingming Cao * some ext4 macro-instructions depend on its value 2264ac27a0ecSDave Kleikamp */ 2265617ba13bSMingming Cao es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 2266ac27a0ecSDave Kleikamp sbi->s_es = es; 2267ac27a0ecSDave Kleikamp sb->s_magic = le16_to_cpu(es->s_magic); 2268617ba13bSMingming Cao if (sb->s_magic != EXT4_SUPER_MAGIC) 2269617ba13bSMingming Cao goto cantfind_ext4; 2270afc32f7eSTheodore Ts'o sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written); 2271ac27a0ecSDave Kleikamp 2272ac27a0ecSDave Kleikamp /* Set defaults before we parse the mount options */ 2273ac27a0ecSDave Kleikamp def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 2274617ba13bSMingming Cao if (def_mount_opts & EXT4_DEFM_DEBUG) 2275ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, DEBUG); 2276617ba13bSMingming Cao if (def_mount_opts & EXT4_DEFM_BSDGROUPS) 2277ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, GRPID); 2278617ba13bSMingming Cao if (def_mount_opts & EXT4_DEFM_UID16) 2279ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, NO_UID32); 228003010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_XATTR 2281617ba13bSMingming Cao if (def_mount_opts & EXT4_DEFM_XATTR_USER) 2282ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, XATTR_USER); 22832e7842b8SHugh Dickins #endif 228403010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 2285617ba13bSMingming Cao if (def_mount_opts & EXT4_DEFM_ACL) 2286ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, POSIX_ACL); 22872e7842b8SHugh Dickins #endif 2288617ba13bSMingming Cao if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) 2289617ba13bSMingming Cao sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA; 2290617ba13bSMingming Cao else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) 2291617ba13bSMingming Cao sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA; 2292617ba13bSMingming Cao else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) 2293617ba13bSMingming Cao sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA; 2294ac27a0ecSDave Kleikamp 2295617ba13bSMingming Cao if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) 2296ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, ERRORS_PANIC); 2297bb4f397aSAneesh Kumar K.V else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE) 2298ceea16bfSDmitry Mishin set_opt(sbi->s_mount_opt, ERRORS_CONT); 2299bb4f397aSAneesh Kumar K.V else 2300bb4f397aSAneesh Kumar K.V set_opt(sbi->s_mount_opt, ERRORS_RO); 2301ac27a0ecSDave Kleikamp 2302ac27a0ecSDave Kleikamp sbi->s_resuid = le16_to_cpu(es->s_def_resuid); 2303ac27a0ecSDave Kleikamp sbi->s_resgid = le16_to_cpu(es->s_def_resgid); 230430773840STheodore Ts'o sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ; 230530773840STheodore Ts'o sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME; 230630773840STheodore Ts'o sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME; 2307ac27a0ecSDave Kleikamp 2308ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, RESERVATION); 2309571640caSEric Sandeen set_opt(sbi->s_mount_opt, BARRIER); 2310ac27a0ecSDave Kleikamp 23111e2462f9SMingming Cao /* 2312dd919b98SAneesh Kumar K.V * enable delayed allocation by default 2313dd919b98SAneesh Kumar K.V * Use -o nodelalloc to turn it off 2314dd919b98SAneesh Kumar K.V */ 2315dd919b98SAneesh Kumar K.V set_opt(sbi->s_mount_opt, DELALLOC); 2316dd919b98SAneesh Kumar K.V 2317dd919b98SAneesh Kumar K.V 2318b3881f74STheodore Ts'o if (!parse_options((char *) data, sb, &journal_devnum, 2319b3881f74STheodore Ts'o &journal_ioprio, NULL, 0)) 2320ac27a0ecSDave Kleikamp goto failed_mount; 2321ac27a0ecSDave Kleikamp 2322ac27a0ecSDave Kleikamp sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 2323617ba13bSMingming Cao ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 2324ac27a0ecSDave Kleikamp 2325617ba13bSMingming Cao if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && 2326617ba13bSMingming Cao (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || 2327617ba13bSMingming Cao EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 2328617ba13bSMingming Cao EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) 2329ac27a0ecSDave Kleikamp printk(KERN_WARNING 2330617ba13bSMingming Cao "EXT4-fs warning: feature flags set on rev 0 fs, " 2331ac27a0ecSDave Kleikamp "running e2fsck is recommended\n"); 2332469108ffSTheodore Tso 2333469108ffSTheodore Tso /* 2334ac27a0ecSDave Kleikamp * Check feature flags regardless of the revision level, since we 2335ac27a0ecSDave Kleikamp * previously didn't change the revision level when setting the flags, 2336ac27a0ecSDave Kleikamp * so there is a chance incompat flags are set on a rev 0 filesystem. 2337ac27a0ecSDave Kleikamp */ 2338617ba13bSMingming Cao features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP); 2339ac27a0ecSDave Kleikamp if (features) { 2340617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of " 23413a06d778SAneesh Kumar K.V "unsupported optional features (%x).\n", sb->s_id, 23423a06d778SAneesh Kumar K.V (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) & 23433a06d778SAneesh Kumar K.V ~EXT4_FEATURE_INCOMPAT_SUPP)); 2344ac27a0ecSDave Kleikamp goto failed_mount; 2345ac27a0ecSDave Kleikamp } 2346617ba13bSMingming Cao features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP); 2347ac27a0ecSDave Kleikamp if (!(sb->s_flags & MS_RDONLY) && features) { 2348617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of " 23493a06d778SAneesh Kumar K.V "unsupported optional features (%x).\n", sb->s_id, 23503a06d778SAneesh Kumar K.V (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) & 23513a06d778SAneesh Kumar K.V ~EXT4_FEATURE_RO_COMPAT_SUPP)); 2352ac27a0ecSDave Kleikamp goto failed_mount; 2353ac27a0ecSDave Kleikamp } 2354f287a1a5STheodore Ts'o has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb, 2355f287a1a5STheodore Ts'o EXT4_FEATURE_RO_COMPAT_HUGE_FILE); 2356f287a1a5STheodore Ts'o if (has_huge_files) { 23570fc1b451SAneesh Kumar K.V /* 23580fc1b451SAneesh Kumar K.V * Large file size enabled file system can only be 2359b3a6ffe1SJens Axboe * mount if kernel is build with CONFIG_LBD 23600fc1b451SAneesh Kumar K.V */ 23610fc1b451SAneesh Kumar K.V if (sizeof(root->i_blocks) < sizeof(u64) && 23620fc1b451SAneesh Kumar K.V !(sb->s_flags & MS_RDONLY)) { 23630fc1b451SAneesh Kumar K.V printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge " 23640fc1b451SAneesh Kumar K.V "files cannot be mounted read-write " 2365b3a6ffe1SJens Axboe "without CONFIG_LBD.\n", sb->s_id); 23660fc1b451SAneesh Kumar K.V goto failed_mount; 23670fc1b451SAneesh Kumar K.V } 23680fc1b451SAneesh Kumar K.V } 2369ac27a0ecSDave Kleikamp blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); 2370ac27a0ecSDave Kleikamp 2371617ba13bSMingming Cao if (blocksize < EXT4_MIN_BLOCK_SIZE || 2372617ba13bSMingming Cao blocksize > EXT4_MAX_BLOCK_SIZE) { 2373ac27a0ecSDave Kleikamp printk(KERN_ERR 2374617ba13bSMingming Cao "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n", 2375ac27a0ecSDave Kleikamp blocksize, sb->s_id); 2376ac27a0ecSDave Kleikamp goto failed_mount; 2377ac27a0ecSDave Kleikamp } 2378ac27a0ecSDave Kleikamp 2379ac27a0ecSDave Kleikamp if (sb->s_blocksize != blocksize) { 2380ce40733cSAneesh Kumar K.V 2381ce40733cSAneesh Kumar K.V /* Validate the filesystem blocksize */ 2382ce40733cSAneesh Kumar K.V if (!sb_set_blocksize(sb, blocksize)) { 2383ce40733cSAneesh Kumar K.V printk(KERN_ERR "EXT4-fs: bad block size %d.\n", 2384ce40733cSAneesh Kumar K.V blocksize); 2385ac27a0ecSDave Kleikamp goto failed_mount; 2386ac27a0ecSDave Kleikamp } 2387ac27a0ecSDave Kleikamp 2388ac27a0ecSDave Kleikamp brelse(bh); 238970bbb3e0SAndrew Morton logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 239070bbb3e0SAndrew Morton offset = do_div(logical_sb_block, blocksize); 239170bbb3e0SAndrew Morton bh = sb_bread(sb, logical_sb_block); 2392ac27a0ecSDave Kleikamp if (!bh) { 2393ac27a0ecSDave Kleikamp printk(KERN_ERR 2394617ba13bSMingming Cao "EXT4-fs: Can't read superblock on 2nd try.\n"); 2395ac27a0ecSDave Kleikamp goto failed_mount; 2396ac27a0ecSDave Kleikamp } 2397617ba13bSMingming Cao es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); 2398ac27a0ecSDave Kleikamp sbi->s_es = es; 2399617ba13bSMingming Cao if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { 2400ac27a0ecSDave Kleikamp printk(KERN_ERR 2401617ba13bSMingming Cao "EXT4-fs: Magic mismatch, very weird !\n"); 2402ac27a0ecSDave Kleikamp goto failed_mount; 2403ac27a0ecSDave Kleikamp } 2404ac27a0ecSDave Kleikamp } 2405ac27a0ecSDave Kleikamp 2406f287a1a5STheodore Ts'o sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits, 2407f287a1a5STheodore Ts'o has_huge_files); 2408f287a1a5STheodore Ts'o sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files); 2409ac27a0ecSDave Kleikamp 2410617ba13bSMingming Cao if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { 2411617ba13bSMingming Cao sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; 2412617ba13bSMingming Cao sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; 2413ac27a0ecSDave Kleikamp } else { 2414ac27a0ecSDave Kleikamp sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 2415ac27a0ecSDave Kleikamp sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 2416617ba13bSMingming Cao if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || 24171330593eSVignesh Babu (!is_power_of_2(sbi->s_inode_size)) || 2418ac27a0ecSDave Kleikamp (sbi->s_inode_size > blocksize)) { 2419ac27a0ecSDave Kleikamp printk(KERN_ERR 2420617ba13bSMingming Cao "EXT4-fs: unsupported inode size: %d\n", 2421ac27a0ecSDave Kleikamp sbi->s_inode_size); 2422ac27a0ecSDave Kleikamp goto failed_mount; 2423ac27a0ecSDave Kleikamp } 2424ef7f3835SKalpak Shah if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) 2425ef7f3835SKalpak Shah sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); 2426ac27a0ecSDave Kleikamp } 24270d1ee42fSAlexandre Ratchov sbi->s_desc_size = le16_to_cpu(es->s_desc_size); 24280d1ee42fSAlexandre Ratchov if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { 24298fadc143SAlexandre Ratchov if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || 24300d1ee42fSAlexandre Ratchov sbi->s_desc_size > EXT4_MAX_DESC_SIZE || 2431d8ea6cf8Svignesh babu !is_power_of_2(sbi->s_desc_size)) { 24320d1ee42fSAlexandre Ratchov printk(KERN_ERR 24338fadc143SAlexandre Ratchov "EXT4-fs: unsupported descriptor size %lu\n", 24340d1ee42fSAlexandre Ratchov sbi->s_desc_size); 24350d1ee42fSAlexandre Ratchov goto failed_mount; 24360d1ee42fSAlexandre Ratchov } 24370d1ee42fSAlexandre Ratchov } else 24380d1ee42fSAlexandre Ratchov sbi->s_desc_size = EXT4_MIN_DESC_SIZE; 2439ac27a0ecSDave Kleikamp sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 2440ac27a0ecSDave Kleikamp sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 2441b47b6f38SAndries E. Brouwer if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0) 2442617ba13bSMingming Cao goto cantfind_ext4; 2443617ba13bSMingming Cao sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); 2444ac27a0ecSDave Kleikamp if (sbi->s_inodes_per_block == 0) 2445617ba13bSMingming Cao goto cantfind_ext4; 2446ac27a0ecSDave Kleikamp sbi->s_itb_per_group = sbi->s_inodes_per_group / 2447ac27a0ecSDave Kleikamp sbi->s_inodes_per_block; 24480d1ee42fSAlexandre Ratchov sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); 2449ac27a0ecSDave Kleikamp sbi->s_sbh = bh; 2450ac27a0ecSDave Kleikamp sbi->s_mount_state = le16_to_cpu(es->s_state); 2451e57aa839SFengguang Wu sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); 2452e57aa839SFengguang Wu sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); 2453ac27a0ecSDave Kleikamp for (i = 0; i < 4; i++) 2454ac27a0ecSDave Kleikamp sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); 2455ac27a0ecSDave Kleikamp sbi->s_def_hash_version = es->s_def_hash_version; 2456f99b2589STheodore Ts'o i = le32_to_cpu(es->s_flags); 2457f99b2589STheodore Ts'o if (i & EXT2_FLAGS_UNSIGNED_HASH) 2458f99b2589STheodore Ts'o sbi->s_hash_unsigned = 3; 2459f99b2589STheodore Ts'o else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) { 2460f99b2589STheodore Ts'o #ifdef __CHAR_UNSIGNED__ 2461f99b2589STheodore Ts'o es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH); 2462f99b2589STheodore Ts'o sbi->s_hash_unsigned = 3; 2463f99b2589STheodore Ts'o #else 2464f99b2589STheodore Ts'o es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH); 2465f99b2589STheodore Ts'o #endif 2466f99b2589STheodore Ts'o sb->s_dirt = 1; 2467f99b2589STheodore Ts'o } 2468ac27a0ecSDave Kleikamp 2469ac27a0ecSDave Kleikamp if (sbi->s_blocks_per_group > blocksize * 8) { 2470ac27a0ecSDave Kleikamp printk(KERN_ERR 2471617ba13bSMingming Cao "EXT4-fs: #blocks per group too big: %lu\n", 2472ac27a0ecSDave Kleikamp sbi->s_blocks_per_group); 2473ac27a0ecSDave Kleikamp goto failed_mount; 2474ac27a0ecSDave Kleikamp } 2475ac27a0ecSDave Kleikamp if (sbi->s_inodes_per_group > blocksize * 8) { 2476ac27a0ecSDave Kleikamp printk(KERN_ERR 2477617ba13bSMingming Cao "EXT4-fs: #inodes per group too big: %lu\n", 2478ac27a0ecSDave Kleikamp sbi->s_inodes_per_group); 2479ac27a0ecSDave Kleikamp goto failed_mount; 2480ac27a0ecSDave Kleikamp } 2481ac27a0ecSDave Kleikamp 2482bd81d8eeSLaurent Vivier if (ext4_blocks_count(es) > 2483ac27a0ecSDave Kleikamp (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { 2484617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: filesystem on %s:" 2485ac27a0ecSDave Kleikamp " too large to mount safely\n", sb->s_id); 2486ac27a0ecSDave Kleikamp if (sizeof(sector_t) < 8) 2487617ba13bSMingming Cao printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not " 2488ac27a0ecSDave Kleikamp "enabled\n"); 2489ac27a0ecSDave Kleikamp goto failed_mount; 2490ac27a0ecSDave Kleikamp } 2491ac27a0ecSDave Kleikamp 2492617ba13bSMingming Cao if (EXT4_BLOCKS_PER_GROUP(sb) == 0) 2493617ba13bSMingming Cao goto cantfind_ext4; 2494e7c95593SEric Sandeen 24954ec11028STheodore Ts'o /* 24964ec11028STheodore Ts'o * It makes no sense for the first data block to be beyond the end 24974ec11028STheodore Ts'o * of the filesystem. 24984ec11028STheodore Ts'o */ 24994ec11028STheodore Ts'o if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) { 25004ec11028STheodore Ts'o printk(KERN_WARNING "EXT4-fs: bad geometry: first data" 25014ec11028STheodore Ts'o "block %u is beyond end of filesystem (%llu)\n", 2502e7c95593SEric Sandeen le32_to_cpu(es->s_first_data_block), 25034ec11028STheodore Ts'o ext4_blocks_count(es)); 2504e7c95593SEric Sandeen goto failed_mount; 2505e7c95593SEric Sandeen } 2506bd81d8eeSLaurent Vivier blocks_count = (ext4_blocks_count(es) - 2507bd81d8eeSLaurent Vivier le32_to_cpu(es->s_first_data_block) + 2508bd81d8eeSLaurent Vivier EXT4_BLOCKS_PER_GROUP(sb) - 1); 2509bd81d8eeSLaurent Vivier do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); 25104ec11028STheodore Ts'o if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) { 25114ec11028STheodore Ts'o printk(KERN_WARNING "EXT4-fs: groups count too large: %u " 25124ec11028STheodore Ts'o "(block count %llu, first data block %u, " 25134ec11028STheodore Ts'o "blocks per group %lu)\n", sbi->s_groups_count, 25144ec11028STheodore Ts'o ext4_blocks_count(es), 25154ec11028STheodore Ts'o le32_to_cpu(es->s_first_data_block), 25164ec11028STheodore Ts'o EXT4_BLOCKS_PER_GROUP(sb)); 25174ec11028STheodore Ts'o goto failed_mount; 25184ec11028STheodore Ts'o } 2519bd81d8eeSLaurent Vivier sbi->s_groups_count = blocks_count; 2520617ba13bSMingming Cao db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / 2521617ba13bSMingming Cao EXT4_DESC_PER_BLOCK(sb); 2522ac27a0ecSDave Kleikamp sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *), 2523ac27a0ecSDave Kleikamp GFP_KERNEL); 2524ac27a0ecSDave Kleikamp if (sbi->s_group_desc == NULL) { 2525617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: not enough memory\n"); 2526ac27a0ecSDave Kleikamp goto failed_mount; 2527ac27a0ecSDave Kleikamp } 2528ac27a0ecSDave Kleikamp 25293244fcb1SAlexander Beregalov #ifdef CONFIG_PROC_FS 25309f6200bbSTheodore Ts'o if (ext4_proc_root) 25319f6200bbSTheodore Ts'o sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); 25329f6200bbSTheodore Ts'o 2533240799cdSTheodore Ts'o if (sbi->s_proc) 2534240799cdSTheodore Ts'o proc_create_data("inode_readahead_blks", 0644, sbi->s_proc, 2535240799cdSTheodore Ts'o &ext4_ui_proc_fops, 2536240799cdSTheodore Ts'o &sbi->s_inode_readahead_blks); 25373244fcb1SAlexander Beregalov #endif 2538240799cdSTheodore Ts'o 2539705895b6SPekka Enberg bgl_lock_init(sbi->s_blockgroup_lock); 2540ac27a0ecSDave Kleikamp 2541ac27a0ecSDave Kleikamp for (i = 0; i < db_count; i++) { 254270bbb3e0SAndrew Morton block = descriptor_loc(sb, logical_sb_block, i); 2543ac27a0ecSDave Kleikamp sbi->s_group_desc[i] = sb_bread(sb, block); 2544ac27a0ecSDave Kleikamp if (!sbi->s_group_desc[i]) { 2545617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: " 2546ac27a0ecSDave Kleikamp "can't read group descriptor %d\n", i); 2547ac27a0ecSDave Kleikamp db_count = i; 2548ac27a0ecSDave Kleikamp goto failed_mount2; 2549ac27a0ecSDave Kleikamp } 2550ac27a0ecSDave Kleikamp } 2551617ba13bSMingming Cao if (!ext4_check_descriptors(sb)) { 2552617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n"); 2553ac27a0ecSDave Kleikamp goto failed_mount2; 2554ac27a0ecSDave Kleikamp } 2555772cb7c8SJose R. Santos if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 2556772cb7c8SJose R. Santos if (!ext4_fill_flex_info(sb)) { 2557772cb7c8SJose R. Santos printk(KERN_ERR 2558772cb7c8SJose R. Santos "EXT4-fs: unable to initialize " 2559772cb7c8SJose R. Santos "flex_bg meta info!\n"); 2560772cb7c8SJose R. Santos goto failed_mount2; 2561772cb7c8SJose R. Santos } 2562772cb7c8SJose R. Santos 2563ac27a0ecSDave Kleikamp sbi->s_gdb_count = db_count; 2564ac27a0ecSDave Kleikamp get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 2565ac27a0ecSDave Kleikamp spin_lock_init(&sbi->s_next_gen_lock); 2566ac27a0ecSDave Kleikamp 2567833f4077SPeter Zijlstra err = percpu_counter_init(&sbi->s_freeblocks_counter, 2568617ba13bSMingming Cao ext4_count_free_blocks(sb)); 2569833f4077SPeter Zijlstra if (!err) { 2570833f4077SPeter Zijlstra err = percpu_counter_init(&sbi->s_freeinodes_counter, 2571617ba13bSMingming Cao ext4_count_free_inodes(sb)); 2572833f4077SPeter Zijlstra } 2573833f4077SPeter Zijlstra if (!err) { 2574833f4077SPeter Zijlstra err = percpu_counter_init(&sbi->s_dirs_counter, 2575617ba13bSMingming Cao ext4_count_dirs(sb)); 2576833f4077SPeter Zijlstra } 25776bc6e63fSAneesh Kumar K.V if (!err) { 25786bc6e63fSAneesh Kumar K.V err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0); 25796bc6e63fSAneesh Kumar K.V } 2580833f4077SPeter Zijlstra if (err) { 2581833f4077SPeter Zijlstra printk(KERN_ERR "EXT4-fs: insufficient memory\n"); 2582833f4077SPeter Zijlstra goto failed_mount3; 2583833f4077SPeter Zijlstra } 2584ac27a0ecSDave Kleikamp 2585c9de560dSAlex Tomas sbi->s_stripe = ext4_get_stripe_size(sbi); 2586c9de560dSAlex Tomas 2587ac27a0ecSDave Kleikamp /* 2588ac27a0ecSDave Kleikamp * set up enough so that it can read an inode 2589ac27a0ecSDave Kleikamp */ 2590617ba13bSMingming Cao sb->s_op = &ext4_sops; 2591617ba13bSMingming Cao sb->s_export_op = &ext4_export_ops; 2592617ba13bSMingming Cao sb->s_xattr = ext4_xattr_handlers; 2593ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 2594617ba13bSMingming Cao sb->s_qcop = &ext4_qctl_operations; 2595617ba13bSMingming Cao sb->dq_op = &ext4_quota_operations; 2596ac27a0ecSDave Kleikamp #endif 2597ac27a0ecSDave Kleikamp INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ 2598ac27a0ecSDave Kleikamp 2599ac27a0ecSDave Kleikamp sb->s_root = NULL; 2600ac27a0ecSDave Kleikamp 2601ac27a0ecSDave Kleikamp needs_recovery = (es->s_last_orphan != 0 || 2602617ba13bSMingming Cao EXT4_HAS_INCOMPAT_FEATURE(sb, 2603617ba13bSMingming Cao EXT4_FEATURE_INCOMPAT_RECOVER)); 2604ac27a0ecSDave Kleikamp 2605ac27a0ecSDave Kleikamp /* 2606ac27a0ecSDave Kleikamp * The first inode we look at is the journal inode. Don't try 2607ac27a0ecSDave Kleikamp * root first: it may be modified in the journal! 2608ac27a0ecSDave Kleikamp */ 2609ac27a0ecSDave Kleikamp if (!test_opt(sb, NOLOAD) && 2610617ba13bSMingming Cao EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 2611617ba13bSMingming Cao if (ext4_load_journal(sb, es, journal_devnum)) 2612ac27a0ecSDave Kleikamp goto failed_mount3; 2613624080edSTheodore Ts'o if (!(sb->s_flags & MS_RDONLY) && 2614624080edSTheodore Ts'o EXT4_SB(sb)->s_journal->j_failed_commit) { 2615624080edSTheodore Ts'o printk(KERN_CRIT "EXT4-fs error (device %s): " 2616624080edSTheodore Ts'o "ext4_fill_super: Journal transaction " 2617624080edSTheodore Ts'o "%u is corrupt\n", sb->s_id, 2618624080edSTheodore Ts'o EXT4_SB(sb)->s_journal->j_failed_commit); 2619624080edSTheodore Ts'o if (test_opt(sb, ERRORS_RO)) { 2620624080edSTheodore Ts'o printk(KERN_CRIT 2621624080edSTheodore Ts'o "Mounting filesystem read-only\n"); 2622624080edSTheodore Ts'o sb->s_flags |= MS_RDONLY; 2623624080edSTheodore Ts'o EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 2624624080edSTheodore Ts'o es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 2625624080edSTheodore Ts'o } 2626624080edSTheodore Ts'o if (test_opt(sb, ERRORS_PANIC)) { 2627624080edSTheodore Ts'o EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 2628624080edSTheodore Ts'o es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 2629624080edSTheodore Ts'o ext4_commit_super(sb, es, 1); 2630624080edSTheodore Ts'o goto failed_mount4; 2631624080edSTheodore Ts'o } 2632624080edSTheodore Ts'o } 26330390131bSFrank Mayhar } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) && 26340390131bSFrank Mayhar EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 26350390131bSFrank Mayhar printk(KERN_ERR "EXT4-fs: required journal recovery " 26360390131bSFrank Mayhar "suppressed and not mounted read-only\n"); 26370390131bSFrank Mayhar goto failed_mount4; 2638ac27a0ecSDave Kleikamp } else { 26390390131bSFrank Mayhar clear_opt(sbi->s_mount_opt, DATA_FLAGS); 26400390131bSFrank Mayhar set_opt(sbi->s_mount_opt, WRITEBACK_DATA); 26410390131bSFrank Mayhar sbi->s_journal = NULL; 26420390131bSFrank Mayhar needs_recovery = 0; 26430390131bSFrank Mayhar goto no_journal; 2644ac27a0ecSDave Kleikamp } 2645ac27a0ecSDave Kleikamp 2646eb40a09cSJose R. Santos if (ext4_blocks_count(es) > 0xffffffffULL && 2647eb40a09cSJose R. Santos !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, 2648eb40a09cSJose R. Santos JBD2_FEATURE_INCOMPAT_64BIT)) { 2649abda1418STheodore Ts'o printk(KERN_ERR "EXT4-fs: Failed to set 64-bit journal feature\n"); 2650eb40a09cSJose R. Santos goto failed_mount4; 2651eb40a09cSJose R. Santos } 2652eb40a09cSJose R. Santos 2653818d276cSGirish Shilamkar if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 2654818d276cSGirish Shilamkar jbd2_journal_set_features(sbi->s_journal, 2655818d276cSGirish Shilamkar JBD2_FEATURE_COMPAT_CHECKSUM, 0, 2656818d276cSGirish Shilamkar JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2657818d276cSGirish Shilamkar } else if (test_opt(sb, JOURNAL_CHECKSUM)) { 2658818d276cSGirish Shilamkar jbd2_journal_set_features(sbi->s_journal, 2659818d276cSGirish Shilamkar JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0); 2660818d276cSGirish Shilamkar jbd2_journal_clear_features(sbi->s_journal, 0, 0, 2661818d276cSGirish Shilamkar JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2662818d276cSGirish Shilamkar } else { 2663818d276cSGirish Shilamkar jbd2_journal_clear_features(sbi->s_journal, 2664818d276cSGirish Shilamkar JBD2_FEATURE_COMPAT_CHECKSUM, 0, 2665818d276cSGirish Shilamkar JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2666818d276cSGirish Shilamkar } 2667818d276cSGirish Shilamkar 2668ac27a0ecSDave Kleikamp /* We have now updated the journal if required, so we can 2669ac27a0ecSDave Kleikamp * validate the data journaling mode. */ 2670ac27a0ecSDave Kleikamp switch (test_opt(sb, DATA_FLAGS)) { 2671ac27a0ecSDave Kleikamp case 0: 2672ac27a0ecSDave Kleikamp /* No mode set, assume a default based on the journal 267363f57933SAndrew Morton * capabilities: ORDERED_DATA if the journal can 267463f57933SAndrew Morton * cope, else JOURNAL_DATA 267563f57933SAndrew Morton */ 2676dab291afSMingming Cao if (jbd2_journal_check_available_features 2677dab291afSMingming Cao (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) 2678ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, ORDERED_DATA); 2679ac27a0ecSDave Kleikamp else 2680ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, JOURNAL_DATA); 2681ac27a0ecSDave Kleikamp break; 2682ac27a0ecSDave Kleikamp 2683617ba13bSMingming Cao case EXT4_MOUNT_ORDERED_DATA: 2684617ba13bSMingming Cao case EXT4_MOUNT_WRITEBACK_DATA: 2685dab291afSMingming Cao if (!jbd2_journal_check_available_features 2686dab291afSMingming Cao (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { 2687617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: Journal does not support " 2688ac27a0ecSDave Kleikamp "requested data journaling mode\n"); 2689ac27a0ecSDave Kleikamp goto failed_mount4; 2690ac27a0ecSDave Kleikamp } 2691ac27a0ecSDave Kleikamp default: 2692ac27a0ecSDave Kleikamp break; 2693ac27a0ecSDave Kleikamp } 2694b3881f74STheodore Ts'o set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); 2695ac27a0ecSDave Kleikamp 26960390131bSFrank Mayhar no_journal: 2697ac27a0ecSDave Kleikamp 2698ac27a0ecSDave Kleikamp if (test_opt(sb, NOBH)) { 2699617ba13bSMingming Cao if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) { 2700617ba13bSMingming Cao printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - " 2701ac27a0ecSDave Kleikamp "its supported only with writeback mode\n"); 2702ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, NOBH); 2703ac27a0ecSDave Kleikamp } 2704ac27a0ecSDave Kleikamp } 2705ac27a0ecSDave Kleikamp /* 2706dab291afSMingming Cao * The jbd2_journal_load will have done any necessary log recovery, 2707ac27a0ecSDave Kleikamp * so we can safely mount the rest of the filesystem now. 2708ac27a0ecSDave Kleikamp */ 2709ac27a0ecSDave Kleikamp 27101d1fe1eeSDavid Howells root = ext4_iget(sb, EXT4_ROOT_INO); 27111d1fe1eeSDavid Howells if (IS_ERR(root)) { 2712617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: get root inode failed\n"); 27131d1fe1eeSDavid Howells ret = PTR_ERR(root); 2714ac27a0ecSDave Kleikamp goto failed_mount4; 2715ac27a0ecSDave Kleikamp } 2716ac27a0ecSDave Kleikamp if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 27171d1fe1eeSDavid Howells iput(root); 2718617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n"); 2719ac27a0ecSDave Kleikamp goto failed_mount4; 2720ac27a0ecSDave Kleikamp } 27211d1fe1eeSDavid Howells sb->s_root = d_alloc_root(root); 27221d1fe1eeSDavid Howells if (!sb->s_root) { 27231d1fe1eeSDavid Howells printk(KERN_ERR "EXT4-fs: get root dentry failed\n"); 27241d1fe1eeSDavid Howells iput(root); 27251d1fe1eeSDavid Howells ret = -ENOMEM; 27261d1fe1eeSDavid Howells goto failed_mount4; 27271d1fe1eeSDavid Howells } 2728ac27a0ecSDave Kleikamp 2729617ba13bSMingming Cao ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY); 2730ef7f3835SKalpak Shah 2731ef7f3835SKalpak Shah /* determine the minimum size of new large inodes, if present */ 2732ef7f3835SKalpak Shah if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { 2733ef7f3835SKalpak Shah sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 2734ef7f3835SKalpak Shah EXT4_GOOD_OLD_INODE_SIZE; 2735ef7f3835SKalpak Shah if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 2736ef7f3835SKalpak Shah EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { 2737ef7f3835SKalpak Shah if (sbi->s_want_extra_isize < 2738ef7f3835SKalpak Shah le16_to_cpu(es->s_want_extra_isize)) 2739ef7f3835SKalpak Shah sbi->s_want_extra_isize = 2740ef7f3835SKalpak Shah le16_to_cpu(es->s_want_extra_isize); 2741ef7f3835SKalpak Shah if (sbi->s_want_extra_isize < 2742ef7f3835SKalpak Shah le16_to_cpu(es->s_min_extra_isize)) 2743ef7f3835SKalpak Shah sbi->s_want_extra_isize = 2744ef7f3835SKalpak Shah le16_to_cpu(es->s_min_extra_isize); 2745ef7f3835SKalpak Shah } 2746ef7f3835SKalpak Shah } 2747ef7f3835SKalpak Shah /* Check if enough inode space is available */ 2748ef7f3835SKalpak Shah if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > 2749ef7f3835SKalpak Shah sbi->s_inode_size) { 2750ef7f3835SKalpak Shah sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 2751ef7f3835SKalpak Shah EXT4_GOOD_OLD_INODE_SIZE; 2752ef7f3835SKalpak Shah printk(KERN_INFO "EXT4-fs: required extra inode space not" 2753ef7f3835SKalpak Shah "available.\n"); 2754ef7f3835SKalpak Shah } 2755ef7f3835SKalpak Shah 2756c2774d84SAneesh Kumar K.V if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { 2757c2774d84SAneesh Kumar K.V printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - " 2758c2774d84SAneesh Kumar K.V "requested data journaling mode\n"); 2759c2774d84SAneesh Kumar K.V clear_opt(sbi->s_mount_opt, DELALLOC); 2760c2774d84SAneesh Kumar K.V } else if (test_opt(sb, DELALLOC)) 2761c2774d84SAneesh Kumar K.V printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n"); 2762c2774d84SAneesh Kumar K.V 2763c2774d84SAneesh Kumar K.V ext4_ext_init(sb); 2764c2774d84SAneesh Kumar K.V err = ext4_mb_init(sb, needs_recovery); 2765c2774d84SAneesh Kumar K.V if (err) { 2766c2774d84SAneesh Kumar K.V printk(KERN_ERR "EXT4-fs: failed to initalize mballoc (%d)\n", 2767c2774d84SAneesh Kumar K.V err); 2768c2774d84SAneesh Kumar K.V goto failed_mount4; 2769c2774d84SAneesh Kumar K.V } 2770c2774d84SAneesh Kumar K.V 27713197ebdbSTheodore Ts'o sbi->s_kobj.kset = ext4_kset; 27723197ebdbSTheodore Ts'o init_completion(&sbi->s_kobj_unregister); 27733197ebdbSTheodore Ts'o err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL, 27743197ebdbSTheodore Ts'o "%s", sb->s_id); 27753197ebdbSTheodore Ts'o if (err) { 27763197ebdbSTheodore Ts'o ext4_mb_release(sb); 27773197ebdbSTheodore Ts'o ext4_ext_release(sb); 27783197ebdbSTheodore Ts'o goto failed_mount4; 27793197ebdbSTheodore Ts'o }; 27803197ebdbSTheodore Ts'o 2781ac27a0ecSDave Kleikamp /* 2782ac27a0ecSDave Kleikamp * akpm: core read_super() calls in here with the superblock locked. 2783ac27a0ecSDave Kleikamp * That deadlocks, because orphan cleanup needs to lock the superblock 2784ac27a0ecSDave Kleikamp * in numerous places. Here we just pop the lock - it's relatively 2785ac27a0ecSDave Kleikamp * harmless, because we are now ready to accept write_super() requests, 2786ac27a0ecSDave Kleikamp * and aviro says that's the only reason for hanging onto the 2787ac27a0ecSDave Kleikamp * superblock lock. 2788ac27a0ecSDave Kleikamp */ 2789617ba13bSMingming Cao EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; 2790617ba13bSMingming Cao ext4_orphan_cleanup(sb, es); 2791617ba13bSMingming Cao EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; 27920390131bSFrank Mayhar if (needs_recovery) { 2793617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: recovery complete.\n"); 2794617ba13bSMingming Cao ext4_mark_recovery_complete(sb, es); 27950390131bSFrank Mayhar } 27960390131bSFrank Mayhar if (EXT4_SB(sb)->s_journal) { 27970390131bSFrank Mayhar if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 27980390131bSFrank Mayhar descr = " journalled data mode"; 27990390131bSFrank Mayhar else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 28000390131bSFrank Mayhar descr = " ordered data mode"; 28010390131bSFrank Mayhar else 28020390131bSFrank Mayhar descr = " writeback data mode"; 28030390131bSFrank Mayhar } else 28040390131bSFrank Mayhar descr = "out journal"; 28050390131bSFrank Mayhar 28060390131bSFrank Mayhar printk(KERN_INFO "EXT4-fs: mounted filesystem %s with%s\n", 28070390131bSFrank Mayhar sb->s_id, descr); 2808ac27a0ecSDave Kleikamp 2809ac27a0ecSDave Kleikamp lock_kernel(); 2810ac27a0ecSDave Kleikamp return 0; 2811ac27a0ecSDave Kleikamp 2812617ba13bSMingming Cao cantfind_ext4: 2813ac27a0ecSDave Kleikamp if (!silent) 2814617ba13bSMingming Cao printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n", 2815ac27a0ecSDave Kleikamp sb->s_id); 2816ac27a0ecSDave Kleikamp goto failed_mount; 2817ac27a0ecSDave Kleikamp 2818ac27a0ecSDave Kleikamp failed_mount4: 28190390131bSFrank Mayhar printk(KERN_ERR "EXT4-fs (device %s): mount failed\n", sb->s_id); 28200390131bSFrank Mayhar if (sbi->s_journal) { 2821dab291afSMingming Cao jbd2_journal_destroy(sbi->s_journal); 282247b4a50bSJan Kara sbi->s_journal = NULL; 28230390131bSFrank Mayhar } 2824ac27a0ecSDave Kleikamp failed_mount3: 2825ac27a0ecSDave Kleikamp percpu_counter_destroy(&sbi->s_freeblocks_counter); 2826ac27a0ecSDave Kleikamp percpu_counter_destroy(&sbi->s_freeinodes_counter); 2827ac27a0ecSDave Kleikamp percpu_counter_destroy(&sbi->s_dirs_counter); 28286bc6e63fSAneesh Kumar K.V percpu_counter_destroy(&sbi->s_dirtyblocks_counter); 2829ac27a0ecSDave Kleikamp failed_mount2: 2830ac27a0ecSDave Kleikamp for (i = 0; i < db_count; i++) 2831ac27a0ecSDave Kleikamp brelse(sbi->s_group_desc[i]); 2832ac27a0ecSDave Kleikamp kfree(sbi->s_group_desc); 2833ac27a0ecSDave Kleikamp failed_mount: 2834240799cdSTheodore Ts'o if (sbi->s_proc) { 2835240799cdSTheodore Ts'o remove_proc_entry("inode_readahead_blks", sbi->s_proc); 28369f6200bbSTheodore Ts'o remove_proc_entry(sb->s_id, ext4_proc_root); 2837240799cdSTheodore Ts'o } 2838ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 2839ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) 2840ac27a0ecSDave Kleikamp kfree(sbi->s_qf_names[i]); 2841ac27a0ecSDave Kleikamp #endif 2842617ba13bSMingming Cao ext4_blkdev_remove(sbi); 2843ac27a0ecSDave Kleikamp brelse(bh); 2844ac27a0ecSDave Kleikamp out_fail: 2845ac27a0ecSDave Kleikamp sb->s_fs_info = NULL; 2846ac27a0ecSDave Kleikamp kfree(sbi); 2847ac27a0ecSDave Kleikamp lock_kernel(); 28481d1fe1eeSDavid Howells return ret; 2849ac27a0ecSDave Kleikamp } 2850ac27a0ecSDave Kleikamp 2851ac27a0ecSDave Kleikamp /* 2852ac27a0ecSDave Kleikamp * Setup any per-fs journal parameters now. We'll do this both on 2853ac27a0ecSDave Kleikamp * initial mount, once the journal has been initialised but before we've 2854ac27a0ecSDave Kleikamp * done any recovery; and again on any subsequent remount. 2855ac27a0ecSDave Kleikamp */ 2856617ba13bSMingming Cao static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) 2857ac27a0ecSDave Kleikamp { 2858617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 2859ac27a0ecSDave Kleikamp 2860ac27a0ecSDave Kleikamp journal->j_commit_interval = sbi->s_commit_interval; 286130773840STheodore Ts'o journal->j_min_batch_time = sbi->s_min_batch_time; 286230773840STheodore Ts'o journal->j_max_batch_time = sbi->s_max_batch_time; 2863ac27a0ecSDave Kleikamp 2864ac27a0ecSDave Kleikamp spin_lock(&journal->j_state_lock); 2865ac27a0ecSDave Kleikamp if (test_opt(sb, BARRIER)) 2866dab291afSMingming Cao journal->j_flags |= JBD2_BARRIER; 2867ac27a0ecSDave Kleikamp else 2868dab291afSMingming Cao journal->j_flags &= ~JBD2_BARRIER; 28695bf5683aSHidehiro Kawai if (test_opt(sb, DATA_ERR_ABORT)) 28705bf5683aSHidehiro Kawai journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR; 28715bf5683aSHidehiro Kawai else 28725bf5683aSHidehiro Kawai journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR; 2873ac27a0ecSDave Kleikamp spin_unlock(&journal->j_state_lock); 2874ac27a0ecSDave Kleikamp } 2875ac27a0ecSDave Kleikamp 2876617ba13bSMingming Cao static journal_t *ext4_get_journal(struct super_block *sb, 2877ac27a0ecSDave Kleikamp unsigned int journal_inum) 2878ac27a0ecSDave Kleikamp { 2879ac27a0ecSDave Kleikamp struct inode *journal_inode; 2880ac27a0ecSDave Kleikamp journal_t *journal; 2881ac27a0ecSDave Kleikamp 28820390131bSFrank Mayhar BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 28830390131bSFrank Mayhar 2884ac27a0ecSDave Kleikamp /* First, test for the existence of a valid inode on disk. Bad 2885ac27a0ecSDave Kleikamp * things happen if we iget() an unused inode, as the subsequent 2886ac27a0ecSDave Kleikamp * iput() will try to delete it. */ 2887ac27a0ecSDave Kleikamp 28881d1fe1eeSDavid Howells journal_inode = ext4_iget(sb, journal_inum); 28891d1fe1eeSDavid Howells if (IS_ERR(journal_inode)) { 2890617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: no journal found.\n"); 2891ac27a0ecSDave Kleikamp return NULL; 2892ac27a0ecSDave Kleikamp } 2893ac27a0ecSDave Kleikamp if (!journal_inode->i_nlink) { 2894ac27a0ecSDave Kleikamp make_bad_inode(journal_inode); 2895ac27a0ecSDave Kleikamp iput(journal_inode); 2896617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n"); 2897ac27a0ecSDave Kleikamp return NULL; 2898ac27a0ecSDave Kleikamp } 2899ac27a0ecSDave Kleikamp 2900e5f8eab8STheodore Ts'o jbd_debug(2, "Journal inode found at %p: %lld bytes\n", 2901ac27a0ecSDave Kleikamp journal_inode, journal_inode->i_size); 29021d1fe1eeSDavid Howells if (!S_ISREG(journal_inode->i_mode)) { 2903617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: invalid journal inode.\n"); 2904ac27a0ecSDave Kleikamp iput(journal_inode); 2905ac27a0ecSDave Kleikamp return NULL; 2906ac27a0ecSDave Kleikamp } 2907ac27a0ecSDave Kleikamp 2908dab291afSMingming Cao journal = jbd2_journal_init_inode(journal_inode); 2909ac27a0ecSDave Kleikamp if (!journal) { 2910617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: Could not load journal inode\n"); 2911ac27a0ecSDave Kleikamp iput(journal_inode); 2912ac27a0ecSDave Kleikamp return NULL; 2913ac27a0ecSDave Kleikamp } 2914ac27a0ecSDave Kleikamp journal->j_private = sb; 2915617ba13bSMingming Cao ext4_init_journal_params(sb, journal); 2916ac27a0ecSDave Kleikamp return journal; 2917ac27a0ecSDave Kleikamp } 2918ac27a0ecSDave Kleikamp 2919617ba13bSMingming Cao static journal_t *ext4_get_dev_journal(struct super_block *sb, 2920ac27a0ecSDave Kleikamp dev_t j_dev) 2921ac27a0ecSDave Kleikamp { 2922ac27a0ecSDave Kleikamp struct buffer_head *bh; 2923ac27a0ecSDave Kleikamp journal_t *journal; 2924617ba13bSMingming Cao ext4_fsblk_t start; 2925617ba13bSMingming Cao ext4_fsblk_t len; 2926ac27a0ecSDave Kleikamp int hblock, blocksize; 2927617ba13bSMingming Cao ext4_fsblk_t sb_block; 2928ac27a0ecSDave Kleikamp unsigned long offset; 2929617ba13bSMingming Cao struct ext4_super_block *es; 2930ac27a0ecSDave Kleikamp struct block_device *bdev; 2931ac27a0ecSDave Kleikamp 29320390131bSFrank Mayhar BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 29330390131bSFrank Mayhar 2934617ba13bSMingming Cao bdev = ext4_blkdev_get(j_dev); 2935ac27a0ecSDave Kleikamp if (bdev == NULL) 2936ac27a0ecSDave Kleikamp return NULL; 2937ac27a0ecSDave Kleikamp 2938ac27a0ecSDave Kleikamp if (bd_claim(bdev, sb)) { 2939ac27a0ecSDave Kleikamp printk(KERN_ERR 2940abda1418STheodore Ts'o "EXT4-fs: failed to claim external journal device.\n"); 29419a1c3542SAl Viro blkdev_put(bdev, FMODE_READ|FMODE_WRITE); 2942ac27a0ecSDave Kleikamp return NULL; 2943ac27a0ecSDave Kleikamp } 2944ac27a0ecSDave Kleikamp 2945ac27a0ecSDave Kleikamp blocksize = sb->s_blocksize; 2946ac27a0ecSDave Kleikamp hblock = bdev_hardsect_size(bdev); 2947ac27a0ecSDave Kleikamp if (blocksize < hblock) { 2948ac27a0ecSDave Kleikamp printk(KERN_ERR 2949617ba13bSMingming Cao "EXT4-fs: blocksize too small for journal device.\n"); 2950ac27a0ecSDave Kleikamp goto out_bdev; 2951ac27a0ecSDave Kleikamp } 2952ac27a0ecSDave Kleikamp 2953617ba13bSMingming Cao sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; 2954617ba13bSMingming Cao offset = EXT4_MIN_BLOCK_SIZE % blocksize; 2955ac27a0ecSDave Kleikamp set_blocksize(bdev, blocksize); 2956ac27a0ecSDave Kleikamp if (!(bh = __bread(bdev, sb_block, blocksize))) { 2957617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: couldn't read superblock of " 2958ac27a0ecSDave Kleikamp "external journal\n"); 2959ac27a0ecSDave Kleikamp goto out_bdev; 2960ac27a0ecSDave Kleikamp } 2961ac27a0ecSDave Kleikamp 2962617ba13bSMingming Cao es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 2963617ba13bSMingming Cao if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || 2964ac27a0ecSDave Kleikamp !(le32_to_cpu(es->s_feature_incompat) & 2965617ba13bSMingming Cao EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { 2966617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: external journal has " 2967ac27a0ecSDave Kleikamp "bad superblock\n"); 2968ac27a0ecSDave Kleikamp brelse(bh); 2969ac27a0ecSDave Kleikamp goto out_bdev; 2970ac27a0ecSDave Kleikamp } 2971ac27a0ecSDave Kleikamp 2972617ba13bSMingming Cao if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { 2973617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: journal UUID does not match\n"); 2974ac27a0ecSDave Kleikamp brelse(bh); 2975ac27a0ecSDave Kleikamp goto out_bdev; 2976ac27a0ecSDave Kleikamp } 2977ac27a0ecSDave Kleikamp 2978bd81d8eeSLaurent Vivier len = ext4_blocks_count(es); 2979ac27a0ecSDave Kleikamp start = sb_block + 1; 2980ac27a0ecSDave Kleikamp brelse(bh); /* we're done with the superblock */ 2981ac27a0ecSDave Kleikamp 2982dab291afSMingming Cao journal = jbd2_journal_init_dev(bdev, sb->s_bdev, 2983ac27a0ecSDave Kleikamp start, len, blocksize); 2984ac27a0ecSDave Kleikamp if (!journal) { 2985617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: failed to create device journal\n"); 2986ac27a0ecSDave Kleikamp goto out_bdev; 2987ac27a0ecSDave Kleikamp } 2988ac27a0ecSDave Kleikamp journal->j_private = sb; 2989ac27a0ecSDave Kleikamp ll_rw_block(READ, 1, &journal->j_sb_buffer); 2990ac27a0ecSDave Kleikamp wait_on_buffer(journal->j_sb_buffer); 2991ac27a0ecSDave Kleikamp if (!buffer_uptodate(journal->j_sb_buffer)) { 2992617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: I/O error on journal device\n"); 2993ac27a0ecSDave Kleikamp goto out_journal; 2994ac27a0ecSDave Kleikamp } 2995ac27a0ecSDave Kleikamp if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { 2996617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: External journal has more than one " 2997ac27a0ecSDave Kleikamp "user (unsupported) - %d\n", 2998ac27a0ecSDave Kleikamp be32_to_cpu(journal->j_superblock->s_nr_users)); 2999ac27a0ecSDave Kleikamp goto out_journal; 3000ac27a0ecSDave Kleikamp } 3001617ba13bSMingming Cao EXT4_SB(sb)->journal_bdev = bdev; 3002617ba13bSMingming Cao ext4_init_journal_params(sb, journal); 3003ac27a0ecSDave Kleikamp return journal; 3004ac27a0ecSDave Kleikamp out_journal: 3005dab291afSMingming Cao jbd2_journal_destroy(journal); 3006ac27a0ecSDave Kleikamp out_bdev: 3007617ba13bSMingming Cao ext4_blkdev_put(bdev); 3008ac27a0ecSDave Kleikamp return NULL; 3009ac27a0ecSDave Kleikamp } 3010ac27a0ecSDave Kleikamp 3011617ba13bSMingming Cao static int ext4_load_journal(struct super_block *sb, 3012617ba13bSMingming Cao struct ext4_super_block *es, 3013ac27a0ecSDave Kleikamp unsigned long journal_devnum) 3014ac27a0ecSDave Kleikamp { 3015ac27a0ecSDave Kleikamp journal_t *journal; 3016ac27a0ecSDave Kleikamp unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); 3017ac27a0ecSDave Kleikamp dev_t journal_dev; 3018ac27a0ecSDave Kleikamp int err = 0; 3019ac27a0ecSDave Kleikamp int really_read_only; 3020ac27a0ecSDave Kleikamp 30210390131bSFrank Mayhar BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 30220390131bSFrank Mayhar 3023ac27a0ecSDave Kleikamp if (journal_devnum && 3024ac27a0ecSDave Kleikamp journal_devnum != le32_to_cpu(es->s_journal_dev)) { 3025617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: external journal device major/minor " 3026ac27a0ecSDave Kleikamp "numbers have changed\n"); 3027ac27a0ecSDave Kleikamp journal_dev = new_decode_dev(journal_devnum); 3028ac27a0ecSDave Kleikamp } else 3029ac27a0ecSDave Kleikamp journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); 3030ac27a0ecSDave Kleikamp 3031ac27a0ecSDave Kleikamp really_read_only = bdev_read_only(sb->s_bdev); 3032ac27a0ecSDave Kleikamp 3033ac27a0ecSDave Kleikamp /* 3034ac27a0ecSDave Kleikamp * Are we loading a blank journal or performing recovery after a 3035ac27a0ecSDave Kleikamp * crash? For recovery, we need to check in advance whether we 3036ac27a0ecSDave Kleikamp * can get read-write access to the device. 3037ac27a0ecSDave Kleikamp */ 3038ac27a0ecSDave Kleikamp 3039617ba13bSMingming Cao if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 3040ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) { 3041617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: INFO: recovery " 3042ac27a0ecSDave Kleikamp "required on readonly filesystem.\n"); 3043ac27a0ecSDave Kleikamp if (really_read_only) { 3044617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: write access " 3045ac27a0ecSDave Kleikamp "unavailable, cannot proceed.\n"); 3046ac27a0ecSDave Kleikamp return -EROFS; 3047ac27a0ecSDave Kleikamp } 3048617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: write access will " 3049ac27a0ecSDave Kleikamp "be enabled during recovery.\n"); 3050ac27a0ecSDave Kleikamp } 3051ac27a0ecSDave Kleikamp } 3052ac27a0ecSDave Kleikamp 3053ac27a0ecSDave Kleikamp if (journal_inum && journal_dev) { 3054617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: filesystem has both journal " 3055ac27a0ecSDave Kleikamp "and inode journals!\n"); 3056ac27a0ecSDave Kleikamp return -EINVAL; 3057ac27a0ecSDave Kleikamp } 3058ac27a0ecSDave Kleikamp 3059ac27a0ecSDave Kleikamp if (journal_inum) { 3060617ba13bSMingming Cao if (!(journal = ext4_get_journal(sb, journal_inum))) 3061ac27a0ecSDave Kleikamp return -EINVAL; 3062ac27a0ecSDave Kleikamp } else { 3063617ba13bSMingming Cao if (!(journal = ext4_get_dev_journal(sb, journal_dev))) 3064ac27a0ecSDave Kleikamp return -EINVAL; 3065ac27a0ecSDave Kleikamp } 3066ac27a0ecSDave Kleikamp 30674776004fSTheodore Ts'o if (journal->j_flags & JBD2_BARRIER) 30684776004fSTheodore Ts'o printk(KERN_INFO "EXT4-fs: barriers enabled\n"); 30694776004fSTheodore Ts'o else 30704776004fSTheodore Ts'o printk(KERN_INFO "EXT4-fs: barriers disabled\n"); 30714776004fSTheodore Ts'o 3072ac27a0ecSDave Kleikamp if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { 3073dab291afSMingming Cao err = jbd2_journal_update_format(journal); 3074ac27a0ecSDave Kleikamp if (err) { 3075617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: error updating journal.\n"); 3076dab291afSMingming Cao jbd2_journal_destroy(journal); 3077ac27a0ecSDave Kleikamp return err; 3078ac27a0ecSDave Kleikamp } 3079ac27a0ecSDave Kleikamp } 3080ac27a0ecSDave Kleikamp 3081617ba13bSMingming Cao if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) 3082dab291afSMingming Cao err = jbd2_journal_wipe(journal, !really_read_only); 3083ac27a0ecSDave Kleikamp if (!err) 3084dab291afSMingming Cao err = jbd2_journal_load(journal); 3085ac27a0ecSDave Kleikamp 3086ac27a0ecSDave Kleikamp if (err) { 3087617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: error loading journal.\n"); 3088dab291afSMingming Cao jbd2_journal_destroy(journal); 3089ac27a0ecSDave Kleikamp return err; 3090ac27a0ecSDave Kleikamp } 3091ac27a0ecSDave Kleikamp 3092617ba13bSMingming Cao EXT4_SB(sb)->s_journal = journal; 3093617ba13bSMingming Cao ext4_clear_journal_err(sb, es); 3094ac27a0ecSDave Kleikamp 3095ac27a0ecSDave Kleikamp if (journal_devnum && 3096ac27a0ecSDave Kleikamp journal_devnum != le32_to_cpu(es->s_journal_dev)) { 3097ac27a0ecSDave Kleikamp es->s_journal_dev = cpu_to_le32(journal_devnum); 3098ac27a0ecSDave Kleikamp sb->s_dirt = 1; 3099ac27a0ecSDave Kleikamp 3100ac27a0ecSDave Kleikamp /* Make sure we flush the recovery flag to disk. */ 3101617ba13bSMingming Cao ext4_commit_super(sb, es, 1); 3102ac27a0ecSDave Kleikamp } 3103ac27a0ecSDave Kleikamp 3104ac27a0ecSDave Kleikamp return 0; 3105ac27a0ecSDave Kleikamp } 3106ac27a0ecSDave Kleikamp 3107c4be0c1dSTakashi Sato static int ext4_commit_super(struct super_block *sb, 31082b2d6d01STheodore Ts'o struct ext4_super_block *es, int sync) 3109ac27a0ecSDave Kleikamp { 3110617ba13bSMingming Cao struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; 3111c4be0c1dSTakashi Sato int error = 0; 3112ac27a0ecSDave Kleikamp 3113ac27a0ecSDave Kleikamp if (!sbh) 3114c4be0c1dSTakashi Sato return error; 3115914258bfSTheodore Ts'o if (buffer_write_io_error(sbh)) { 3116914258bfSTheodore Ts'o /* 3117914258bfSTheodore Ts'o * Oh, dear. A previous attempt to write the 3118914258bfSTheodore Ts'o * superblock failed. This could happen because the 3119914258bfSTheodore Ts'o * USB device was yanked out. Or it could happen to 3120914258bfSTheodore Ts'o * be a transient write error and maybe the block will 3121914258bfSTheodore Ts'o * be remapped. Nothing we can do but to retry the 3122914258bfSTheodore Ts'o * write and hope for the best. 3123914258bfSTheodore Ts'o */ 3124abda1418STheodore Ts'o printk(KERN_ERR "EXT4-fs: previous I/O error to " 3125914258bfSTheodore Ts'o "superblock detected for %s.\n", sb->s_id); 3126914258bfSTheodore Ts'o clear_buffer_write_io_error(sbh); 3127914258bfSTheodore Ts'o set_buffer_uptodate(sbh); 3128914258bfSTheodore Ts'o } 3129ac27a0ecSDave Kleikamp es->s_wtime = cpu_to_le32(get_seconds()); 3130afc32f7eSTheodore Ts'o es->s_kbytes_written = 3131afc32f7eSTheodore Ts'o cpu_to_le64(EXT4_SB(sb)->s_kbytes_written + 3132afc32f7eSTheodore Ts'o ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 3133afc32f7eSTheodore Ts'o EXT4_SB(sb)->s_sectors_written_start) >> 1)); 31345d1b1b3fSAneesh Kumar K.V ext4_free_blocks_count_set(es, percpu_counter_sum_positive( 31355d1b1b3fSAneesh Kumar K.V &EXT4_SB(sb)->s_freeblocks_counter)); 31365d1b1b3fSAneesh Kumar K.V es->s_free_inodes_count = cpu_to_le32(percpu_counter_sum_positive( 31375d1b1b3fSAneesh Kumar K.V &EXT4_SB(sb)->s_freeinodes_counter)); 31385d1b1b3fSAneesh Kumar K.V 3139ac27a0ecSDave Kleikamp BUFFER_TRACE(sbh, "marking dirty"); 3140ac27a0ecSDave Kleikamp mark_buffer_dirty(sbh); 3141914258bfSTheodore Ts'o if (sync) { 3142c4be0c1dSTakashi Sato error = sync_dirty_buffer(sbh); 3143c4be0c1dSTakashi Sato if (error) 3144c4be0c1dSTakashi Sato return error; 3145c4be0c1dSTakashi Sato 3146c4be0c1dSTakashi Sato error = buffer_write_io_error(sbh); 3147c4be0c1dSTakashi Sato if (error) { 3148abda1418STheodore Ts'o printk(KERN_ERR "EXT4-fs: I/O error while writing " 3149914258bfSTheodore Ts'o "superblock for %s.\n", sb->s_id); 3150914258bfSTheodore Ts'o clear_buffer_write_io_error(sbh); 3151914258bfSTheodore Ts'o set_buffer_uptodate(sbh); 3152914258bfSTheodore Ts'o } 3153914258bfSTheodore Ts'o } 3154c4be0c1dSTakashi Sato return error; 3155ac27a0ecSDave Kleikamp } 3156ac27a0ecSDave Kleikamp 3157ac27a0ecSDave Kleikamp 3158ac27a0ecSDave Kleikamp /* 3159ac27a0ecSDave Kleikamp * Have we just finished recovery? If so, and if we are mounting (or 3160ac27a0ecSDave Kleikamp * remounting) the filesystem readonly, then we will end up with a 3161ac27a0ecSDave Kleikamp * consistent fs on disk. Record that fact. 3162ac27a0ecSDave Kleikamp */ 3163617ba13bSMingming Cao static void ext4_mark_recovery_complete(struct super_block *sb, 3164617ba13bSMingming Cao struct ext4_super_block *es) 3165ac27a0ecSDave Kleikamp { 3166617ba13bSMingming Cao journal_t *journal = EXT4_SB(sb)->s_journal; 3167ac27a0ecSDave Kleikamp 31680390131bSFrank Mayhar if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 31690390131bSFrank Mayhar BUG_ON(journal != NULL); 31700390131bSFrank Mayhar return; 31710390131bSFrank Mayhar } 3172dab291afSMingming Cao jbd2_journal_lock_updates(journal); 31737ffe1ea8SHidehiro Kawai if (jbd2_journal_flush(journal) < 0) 31747ffe1ea8SHidehiro Kawai goto out; 31757ffe1ea8SHidehiro Kawai 317632c37730SJan Kara lock_super(sb); 3177617ba13bSMingming Cao if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && 3178ac27a0ecSDave Kleikamp sb->s_flags & MS_RDONLY) { 3179617ba13bSMingming Cao EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 3180ac27a0ecSDave Kleikamp sb->s_dirt = 0; 3181617ba13bSMingming Cao ext4_commit_super(sb, es, 1); 3182ac27a0ecSDave Kleikamp } 318332c37730SJan Kara unlock_super(sb); 31847ffe1ea8SHidehiro Kawai 31857ffe1ea8SHidehiro Kawai out: 3186dab291afSMingming Cao jbd2_journal_unlock_updates(journal); 3187ac27a0ecSDave Kleikamp } 3188ac27a0ecSDave Kleikamp 3189ac27a0ecSDave Kleikamp /* 3190ac27a0ecSDave Kleikamp * If we are mounting (or read-write remounting) a filesystem whose journal 3191ac27a0ecSDave Kleikamp * has recorded an error from a previous lifetime, move that error to the 3192ac27a0ecSDave Kleikamp * main filesystem now. 3193ac27a0ecSDave Kleikamp */ 3194617ba13bSMingming Cao static void ext4_clear_journal_err(struct super_block *sb, 3195617ba13bSMingming Cao struct ext4_super_block *es) 3196ac27a0ecSDave Kleikamp { 3197ac27a0ecSDave Kleikamp journal_t *journal; 3198ac27a0ecSDave Kleikamp int j_errno; 3199ac27a0ecSDave Kleikamp const char *errstr; 3200ac27a0ecSDave Kleikamp 32010390131bSFrank Mayhar BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 32020390131bSFrank Mayhar 3203617ba13bSMingming Cao journal = EXT4_SB(sb)->s_journal; 3204ac27a0ecSDave Kleikamp 3205ac27a0ecSDave Kleikamp /* 3206ac27a0ecSDave Kleikamp * Now check for any error status which may have been recorded in the 3207617ba13bSMingming Cao * journal by a prior ext4_error() or ext4_abort() 3208ac27a0ecSDave Kleikamp */ 3209ac27a0ecSDave Kleikamp 3210dab291afSMingming Cao j_errno = jbd2_journal_errno(journal); 3211ac27a0ecSDave Kleikamp if (j_errno) { 3212ac27a0ecSDave Kleikamp char nbuf[16]; 3213ac27a0ecSDave Kleikamp 3214617ba13bSMingming Cao errstr = ext4_decode_error(sb, j_errno, nbuf); 321546e665e9SHarvey Harrison ext4_warning(sb, __func__, "Filesystem error recorded " 3216ac27a0ecSDave Kleikamp "from previous mount: %s", errstr); 321746e665e9SHarvey Harrison ext4_warning(sb, __func__, "Marking fs in need of " 3218ac27a0ecSDave Kleikamp "filesystem check."); 3219ac27a0ecSDave Kleikamp 3220617ba13bSMingming Cao EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 3221617ba13bSMingming Cao es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 3222617ba13bSMingming Cao ext4_commit_super(sb, es, 1); 3223ac27a0ecSDave Kleikamp 3224dab291afSMingming Cao jbd2_journal_clear_err(journal); 3225ac27a0ecSDave Kleikamp } 3226ac27a0ecSDave Kleikamp } 3227ac27a0ecSDave Kleikamp 3228ac27a0ecSDave Kleikamp /* 3229ac27a0ecSDave Kleikamp * Force the running and committing transactions to commit, 3230ac27a0ecSDave Kleikamp * and wait on the commit. 3231ac27a0ecSDave Kleikamp */ 3232617ba13bSMingming Cao int ext4_force_commit(struct super_block *sb) 3233ac27a0ecSDave Kleikamp { 3234ac27a0ecSDave Kleikamp journal_t *journal; 32350390131bSFrank Mayhar int ret = 0; 3236ac27a0ecSDave Kleikamp 3237ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) 3238ac27a0ecSDave Kleikamp return 0; 3239ac27a0ecSDave Kleikamp 3240617ba13bSMingming Cao journal = EXT4_SB(sb)->s_journal; 32410390131bSFrank Mayhar if (journal) { 3242ac27a0ecSDave Kleikamp sb->s_dirt = 0; 3243617ba13bSMingming Cao ret = ext4_journal_force_commit(journal); 32440390131bSFrank Mayhar } 32450390131bSFrank Mayhar 3246ac27a0ecSDave Kleikamp return ret; 3247ac27a0ecSDave Kleikamp } 3248ac27a0ecSDave Kleikamp 3249ac27a0ecSDave Kleikamp /* 3250617ba13bSMingming Cao * Ext4 always journals updates to the superblock itself, so we don't 3251ac27a0ecSDave Kleikamp * have to propagate any other updates to the superblock on disk at this 325214ce0cb4STheodore Ts'o * point. (We can probably nuke this function altogether, and remove 325314ce0cb4STheodore Ts'o * any mention to sb->s_dirt in all of fs/ext4; eventual cleanup...) 3254ac27a0ecSDave Kleikamp */ 3255617ba13bSMingming Cao static void ext4_write_super(struct super_block *sb) 3256ac27a0ecSDave Kleikamp { 32570390131bSFrank Mayhar if (EXT4_SB(sb)->s_journal) { 3258ac27a0ecSDave Kleikamp if (mutex_trylock(&sb->s_lock) != 0) 3259ac27a0ecSDave Kleikamp BUG(); 3260ac27a0ecSDave Kleikamp sb->s_dirt = 0; 32610390131bSFrank Mayhar } else { 32620390131bSFrank Mayhar ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); 32630390131bSFrank Mayhar } 3264ac27a0ecSDave Kleikamp } 3265ac27a0ecSDave Kleikamp 3266617ba13bSMingming Cao static int ext4_sync_fs(struct super_block *sb, int wait) 3267ac27a0ecSDave Kleikamp { 326814ce0cb4STheodore Ts'o int ret = 0; 32699eddacf9SJan Kara tid_t target; 3270ac27a0ecSDave Kleikamp 3271ede86cc4STheodore Ts'o trace_mark(ext4_sync_fs, "dev %s wait %d", sb->s_id, wait); 3272ac27a0ecSDave Kleikamp sb->s_dirt = 0; 32730390131bSFrank Mayhar if (EXT4_SB(sb)->s_journal) { 32749eddacf9SJan Kara if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, 32759eddacf9SJan Kara &target)) { 3276ac27a0ecSDave Kleikamp if (wait) 32779eddacf9SJan Kara jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, 32789eddacf9SJan Kara target); 32799eddacf9SJan Kara } 32800390131bSFrank Mayhar } else { 32810390131bSFrank Mayhar ext4_commit_super(sb, EXT4_SB(sb)->s_es, wait); 32820390131bSFrank Mayhar } 328314ce0cb4STheodore Ts'o return ret; 3284ac27a0ecSDave Kleikamp } 3285ac27a0ecSDave Kleikamp 3286ac27a0ecSDave Kleikamp /* 3287ac27a0ecSDave Kleikamp * LVM calls this function before a (read-only) snapshot is created. This 3288ac27a0ecSDave Kleikamp * gives us a chance to flush the journal completely and mark the fs clean. 3289ac27a0ecSDave Kleikamp */ 3290c4be0c1dSTakashi Sato static int ext4_freeze(struct super_block *sb) 3291ac27a0ecSDave Kleikamp { 3292c4be0c1dSTakashi Sato int error = 0; 3293c4be0c1dSTakashi Sato journal_t *journal; 3294ac27a0ecSDave Kleikamp sb->s_dirt = 0; 3295ac27a0ecSDave Kleikamp 3296ac27a0ecSDave Kleikamp if (!(sb->s_flags & MS_RDONLY)) { 3297c4be0c1dSTakashi Sato journal = EXT4_SB(sb)->s_journal; 3298ac27a0ecSDave Kleikamp 32990390131bSFrank Mayhar if (journal) { 3300ac27a0ecSDave Kleikamp /* Now we set up the journal barrier. */ 3301dab291afSMingming Cao jbd2_journal_lock_updates(journal); 33027ffe1ea8SHidehiro Kawai 33037ffe1ea8SHidehiro Kawai /* 33040390131bSFrank Mayhar * We don't want to clear needs_recovery flag when we 33050390131bSFrank Mayhar * failed to flush the journal. 33067ffe1ea8SHidehiro Kawai */ 3307c4be0c1dSTakashi Sato error = jbd2_journal_flush(journal); 3308c4be0c1dSTakashi Sato if (error < 0) 3309c4be0c1dSTakashi Sato goto out; 33100390131bSFrank Mayhar } 3311ac27a0ecSDave Kleikamp 3312ac27a0ecSDave Kleikamp /* Journal blocked and flushed, clear needs_recovery flag. */ 3313617ba13bSMingming Cao EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 3314c4be0c1dSTakashi Sato error = ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); 3315c4be0c1dSTakashi Sato if (error) 3316c4be0c1dSTakashi Sato goto out; 3317ac27a0ecSDave Kleikamp } 3318c4be0c1dSTakashi Sato return 0; 3319c4be0c1dSTakashi Sato out: 3320c4be0c1dSTakashi Sato jbd2_journal_unlock_updates(journal); 3321c4be0c1dSTakashi Sato return error; 3322ac27a0ecSDave Kleikamp } 3323ac27a0ecSDave Kleikamp 3324ac27a0ecSDave Kleikamp /* 3325ac27a0ecSDave Kleikamp * Called by LVM after the snapshot is done. We need to reset the RECOVER 3326ac27a0ecSDave Kleikamp * flag here, even though the filesystem is not technically dirty yet. 3327ac27a0ecSDave Kleikamp */ 3328c4be0c1dSTakashi Sato static int ext4_unfreeze(struct super_block *sb) 3329ac27a0ecSDave Kleikamp { 33300390131bSFrank Mayhar if (EXT4_SB(sb)->s_journal && !(sb->s_flags & MS_RDONLY)) { 3331ac27a0ecSDave Kleikamp lock_super(sb); 3332ac27a0ecSDave Kleikamp /* Reser the needs_recovery flag before the fs is unlocked. */ 3333617ba13bSMingming Cao EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 3334617ba13bSMingming Cao ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); 3335ac27a0ecSDave Kleikamp unlock_super(sb); 3336dab291afSMingming Cao jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 3337ac27a0ecSDave Kleikamp } 3338c4be0c1dSTakashi Sato return 0; 3339ac27a0ecSDave Kleikamp } 3340ac27a0ecSDave Kleikamp 3341617ba13bSMingming Cao static int ext4_remount(struct super_block *sb, int *flags, char *data) 3342ac27a0ecSDave Kleikamp { 3343617ba13bSMingming Cao struct ext4_super_block *es; 3344617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 3345617ba13bSMingming Cao ext4_fsblk_t n_blocks_count = 0; 3346ac27a0ecSDave Kleikamp unsigned long old_sb_flags; 3347617ba13bSMingming Cao struct ext4_mount_options old_opts; 33488a266467STheodore Ts'o ext4_group_t g; 3349b3881f74STheodore Ts'o unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; 3350ac27a0ecSDave Kleikamp int err; 3351ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 3352ac27a0ecSDave Kleikamp int i; 3353ac27a0ecSDave Kleikamp #endif 3354ac27a0ecSDave Kleikamp 3355ac27a0ecSDave Kleikamp /* Store the original options */ 3356ac27a0ecSDave Kleikamp old_sb_flags = sb->s_flags; 3357ac27a0ecSDave Kleikamp old_opts.s_mount_opt = sbi->s_mount_opt; 3358ac27a0ecSDave Kleikamp old_opts.s_resuid = sbi->s_resuid; 3359ac27a0ecSDave Kleikamp old_opts.s_resgid = sbi->s_resgid; 3360ac27a0ecSDave Kleikamp old_opts.s_commit_interval = sbi->s_commit_interval; 336130773840STheodore Ts'o old_opts.s_min_batch_time = sbi->s_min_batch_time; 336230773840STheodore Ts'o old_opts.s_max_batch_time = sbi->s_max_batch_time; 3363ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 3364ac27a0ecSDave Kleikamp old_opts.s_jquota_fmt = sbi->s_jquota_fmt; 3365ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) 3366ac27a0ecSDave Kleikamp old_opts.s_qf_names[i] = sbi->s_qf_names[i]; 3367ac27a0ecSDave Kleikamp #endif 3368b3881f74STheodore Ts'o if (sbi->s_journal && sbi->s_journal->j_task->io_context) 3369b3881f74STheodore Ts'o journal_ioprio = sbi->s_journal->j_task->io_context->ioprio; 3370ac27a0ecSDave Kleikamp 3371ac27a0ecSDave Kleikamp /* 3372ac27a0ecSDave Kleikamp * Allow the "check" option to be passed as a remount option. 3373ac27a0ecSDave Kleikamp */ 3374b3881f74STheodore Ts'o if (!parse_options(data, sb, NULL, &journal_ioprio, 3375b3881f74STheodore Ts'o &n_blocks_count, 1)) { 3376ac27a0ecSDave Kleikamp err = -EINVAL; 3377ac27a0ecSDave Kleikamp goto restore_opts; 3378ac27a0ecSDave Kleikamp } 3379ac27a0ecSDave Kleikamp 3380617ba13bSMingming Cao if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) 338146e665e9SHarvey Harrison ext4_abort(sb, __func__, "Abort forced by user"); 3382ac27a0ecSDave Kleikamp 3383ac27a0ecSDave Kleikamp sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 3384617ba13bSMingming Cao ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 3385ac27a0ecSDave Kleikamp 3386ac27a0ecSDave Kleikamp es = sbi->s_es; 3387ac27a0ecSDave Kleikamp 3388b3881f74STheodore Ts'o if (sbi->s_journal) { 3389617ba13bSMingming Cao ext4_init_journal_params(sb, sbi->s_journal); 3390b3881f74STheodore Ts'o set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); 3391b3881f74STheodore Ts'o } 3392ac27a0ecSDave Kleikamp 3393ac27a0ecSDave Kleikamp if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || 3394bd81d8eeSLaurent Vivier n_blocks_count > ext4_blocks_count(es)) { 3395617ba13bSMingming Cao if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) { 3396ac27a0ecSDave Kleikamp err = -EROFS; 3397ac27a0ecSDave Kleikamp goto restore_opts; 3398ac27a0ecSDave Kleikamp } 3399ac27a0ecSDave Kleikamp 3400ac27a0ecSDave Kleikamp if (*flags & MS_RDONLY) { 3401ac27a0ecSDave Kleikamp /* 3402ac27a0ecSDave Kleikamp * First of all, the unconditional stuff we have to do 3403ac27a0ecSDave Kleikamp * to disable replay of the journal when we next remount 3404ac27a0ecSDave Kleikamp */ 3405ac27a0ecSDave Kleikamp sb->s_flags |= MS_RDONLY; 3406ac27a0ecSDave Kleikamp 3407ac27a0ecSDave Kleikamp /* 3408ac27a0ecSDave Kleikamp * OK, test if we are remounting a valid rw partition 3409ac27a0ecSDave Kleikamp * readonly, and if so set the rdonly flag and then 3410ac27a0ecSDave Kleikamp * mark the partition as valid again. 3411ac27a0ecSDave Kleikamp */ 3412617ba13bSMingming Cao if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && 3413617ba13bSMingming Cao (sbi->s_mount_state & EXT4_VALID_FS)) 3414ac27a0ecSDave Kleikamp es->s_state = cpu_to_le16(sbi->s_mount_state); 3415ac27a0ecSDave Kleikamp 341632c37730SJan Kara /* 341732c37730SJan Kara * We have to unlock super so that we can wait for 341832c37730SJan Kara * transactions. 341932c37730SJan Kara */ 34200390131bSFrank Mayhar if (sbi->s_journal) { 342132c37730SJan Kara unlock_super(sb); 3422617ba13bSMingming Cao ext4_mark_recovery_complete(sb, es); 342332c37730SJan Kara lock_super(sb); 34240390131bSFrank Mayhar } 3425ac27a0ecSDave Kleikamp } else { 34263a06d778SAneesh Kumar K.V int ret; 3427617ba13bSMingming Cao if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb, 3428617ba13bSMingming Cao ~EXT4_FEATURE_RO_COMPAT_SUPP))) { 3429617ba13bSMingming Cao printk(KERN_WARNING "EXT4-fs: %s: couldn't " 3430ac27a0ecSDave Kleikamp "remount RDWR because of unsupported " 34313a06d778SAneesh Kumar K.V "optional features (%x).\n", sb->s_id, 34323a06d778SAneesh Kumar K.V (le32_to_cpu(sbi->s_es->s_feature_ro_compat) & 34333a06d778SAneesh Kumar K.V ~EXT4_FEATURE_RO_COMPAT_SUPP)); 3434ac27a0ecSDave Kleikamp err = -EROFS; 3435ac27a0ecSDave Kleikamp goto restore_opts; 3436ac27a0ecSDave Kleikamp } 3437ead6596bSEric Sandeen 3438ead6596bSEric Sandeen /* 34398a266467STheodore Ts'o * Make sure the group descriptor checksums 34408a266467STheodore Ts'o * are sane. If they aren't, refuse to 34418a266467STheodore Ts'o * remount r/w. 34428a266467STheodore Ts'o */ 34438a266467STheodore Ts'o for (g = 0; g < sbi->s_groups_count; g++) { 34448a266467STheodore Ts'o struct ext4_group_desc *gdp = 34458a266467STheodore Ts'o ext4_get_group_desc(sb, g, NULL); 34468a266467STheodore Ts'o 34478a266467STheodore Ts'o if (!ext4_group_desc_csum_verify(sbi, g, gdp)) { 34488a266467STheodore Ts'o printk(KERN_ERR 34498a266467STheodore Ts'o "EXT4-fs: ext4_remount: " 3450a9df9a49STheodore Ts'o "Checksum for group %u failed (%u!=%u)\n", 34518a266467STheodore Ts'o g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)), 34528a266467STheodore Ts'o le16_to_cpu(gdp->bg_checksum)); 34538a266467STheodore Ts'o err = -EINVAL; 34548a266467STheodore Ts'o goto restore_opts; 34558a266467STheodore Ts'o } 34568a266467STheodore Ts'o } 34578a266467STheodore Ts'o 34588a266467STheodore Ts'o /* 3459ead6596bSEric Sandeen * If we have an unprocessed orphan list hanging 3460ead6596bSEric Sandeen * around from a previously readonly bdev mount, 3461ead6596bSEric Sandeen * require a full umount/remount for now. 3462ead6596bSEric Sandeen */ 3463ead6596bSEric Sandeen if (es->s_last_orphan) { 3464ead6596bSEric Sandeen printk(KERN_WARNING "EXT4-fs: %s: couldn't " 3465ead6596bSEric Sandeen "remount RDWR because of unprocessed " 3466ead6596bSEric Sandeen "orphan inode list. Please " 3467ead6596bSEric Sandeen "umount/remount instead.\n", 3468ead6596bSEric Sandeen sb->s_id); 3469ead6596bSEric Sandeen err = -EINVAL; 3470ead6596bSEric Sandeen goto restore_opts; 3471ead6596bSEric Sandeen } 3472ead6596bSEric Sandeen 3473ac27a0ecSDave Kleikamp /* 3474ac27a0ecSDave Kleikamp * Mounting a RDONLY partition read-write, so reread 3475ac27a0ecSDave Kleikamp * and store the current valid flag. (It may have 3476ac27a0ecSDave Kleikamp * been changed by e2fsck since we originally mounted 3477ac27a0ecSDave Kleikamp * the partition.) 3478ac27a0ecSDave Kleikamp */ 34790390131bSFrank Mayhar if (sbi->s_journal) 3480617ba13bSMingming Cao ext4_clear_journal_err(sb, es); 3481ac27a0ecSDave Kleikamp sbi->s_mount_state = le16_to_cpu(es->s_state); 3482617ba13bSMingming Cao if ((err = ext4_group_extend(sb, es, n_blocks_count))) 3483ac27a0ecSDave Kleikamp goto restore_opts; 3484617ba13bSMingming Cao if (!ext4_setup_super(sb, es, 0)) 3485ac27a0ecSDave Kleikamp sb->s_flags &= ~MS_RDONLY; 3486ac27a0ecSDave Kleikamp } 3487ac27a0ecSDave Kleikamp } 34880390131bSFrank Mayhar if (sbi->s_journal == NULL) 34890390131bSFrank Mayhar ext4_commit_super(sb, es, 1); 34900390131bSFrank Mayhar 3491ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 3492ac27a0ecSDave Kleikamp /* Release old quota file names */ 3493ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) 3494ac27a0ecSDave Kleikamp if (old_opts.s_qf_names[i] && 3495ac27a0ecSDave Kleikamp old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 3496ac27a0ecSDave Kleikamp kfree(old_opts.s_qf_names[i]); 3497ac27a0ecSDave Kleikamp #endif 3498ac27a0ecSDave Kleikamp return 0; 3499ac27a0ecSDave Kleikamp restore_opts: 3500ac27a0ecSDave Kleikamp sb->s_flags = old_sb_flags; 3501ac27a0ecSDave Kleikamp sbi->s_mount_opt = old_opts.s_mount_opt; 3502ac27a0ecSDave Kleikamp sbi->s_resuid = old_opts.s_resuid; 3503ac27a0ecSDave Kleikamp sbi->s_resgid = old_opts.s_resgid; 3504ac27a0ecSDave Kleikamp sbi->s_commit_interval = old_opts.s_commit_interval; 350530773840STheodore Ts'o sbi->s_min_batch_time = old_opts.s_min_batch_time; 350630773840STheodore Ts'o sbi->s_max_batch_time = old_opts.s_max_batch_time; 3507ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 3508ac27a0ecSDave Kleikamp sbi->s_jquota_fmt = old_opts.s_jquota_fmt; 3509ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) { 3510ac27a0ecSDave Kleikamp if (sbi->s_qf_names[i] && 3511ac27a0ecSDave Kleikamp old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 3512ac27a0ecSDave Kleikamp kfree(sbi->s_qf_names[i]); 3513ac27a0ecSDave Kleikamp sbi->s_qf_names[i] = old_opts.s_qf_names[i]; 3514ac27a0ecSDave Kleikamp } 3515ac27a0ecSDave Kleikamp #endif 3516ac27a0ecSDave Kleikamp return err; 3517ac27a0ecSDave Kleikamp } 3518ac27a0ecSDave Kleikamp 3519617ba13bSMingming Cao static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf) 3520ac27a0ecSDave Kleikamp { 3521ac27a0ecSDave Kleikamp struct super_block *sb = dentry->d_sb; 3522617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 3523617ba13bSMingming Cao struct ext4_super_block *es = sbi->s_es; 3524960cc398SPekka Enberg u64 fsid; 3525ac27a0ecSDave Kleikamp 35265e70030dSBadari Pulavarty if (test_opt(sb, MINIX_DF)) { 35275e70030dSBadari Pulavarty sbi->s_overhead_last = 0; 35286bc9feffSAneesh Kumar K.V } else if (sbi->s_blocks_last != ext4_blocks_count(es)) { 3529fd2d4291SAvantika Mathur ext4_group_t ngroups = sbi->s_groups_count, i; 35305e70030dSBadari Pulavarty ext4_fsblk_t overhead = 0; 3531ac27a0ecSDave Kleikamp smp_rmb(); 3532ac27a0ecSDave Kleikamp 3533ac27a0ecSDave Kleikamp /* 35345e70030dSBadari Pulavarty * Compute the overhead (FS structures). This is constant 35355e70030dSBadari Pulavarty * for a given filesystem unless the number of block groups 35365e70030dSBadari Pulavarty * changes so we cache the previous value until it does. 3537ac27a0ecSDave Kleikamp */ 3538ac27a0ecSDave Kleikamp 3539ac27a0ecSDave Kleikamp /* 3540ac27a0ecSDave Kleikamp * All of the blocks before first_data_block are 3541ac27a0ecSDave Kleikamp * overhead 3542ac27a0ecSDave Kleikamp */ 3543ac27a0ecSDave Kleikamp overhead = le32_to_cpu(es->s_first_data_block); 3544ac27a0ecSDave Kleikamp 3545ac27a0ecSDave Kleikamp /* 3546ac27a0ecSDave Kleikamp * Add the overhead attributed to the superblock and 3547ac27a0ecSDave Kleikamp * block group descriptors. If the sparse superblocks 3548ac27a0ecSDave Kleikamp * feature is turned on, then not all groups have this. 3549ac27a0ecSDave Kleikamp */ 3550ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 3551617ba13bSMingming Cao overhead += ext4_bg_has_super(sb, i) + 3552617ba13bSMingming Cao ext4_bg_num_gdb(sb, i); 3553ac27a0ecSDave Kleikamp cond_resched(); 3554ac27a0ecSDave Kleikamp } 3555ac27a0ecSDave Kleikamp 3556ac27a0ecSDave Kleikamp /* 3557ac27a0ecSDave Kleikamp * Every block group has an inode bitmap, a block 3558ac27a0ecSDave Kleikamp * bitmap, and an inode table. 3559ac27a0ecSDave Kleikamp */ 35605e70030dSBadari Pulavarty overhead += ngroups * (2 + sbi->s_itb_per_group); 35615e70030dSBadari Pulavarty sbi->s_overhead_last = overhead; 35625e70030dSBadari Pulavarty smp_wmb(); 35636bc9feffSAneesh Kumar K.V sbi->s_blocks_last = ext4_blocks_count(es); 3564ac27a0ecSDave Kleikamp } 3565ac27a0ecSDave Kleikamp 3566617ba13bSMingming Cao buf->f_type = EXT4_SUPER_MAGIC; 3567ac27a0ecSDave Kleikamp buf->f_bsize = sb->s_blocksize; 35685e70030dSBadari Pulavarty buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last; 35696bc6e63fSAneesh Kumar K.V buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) - 35706bc6e63fSAneesh Kumar K.V percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter); 3571308ba3ecSAneesh Kumar K.V ext4_free_blocks_count_set(es, buf->f_bfree); 3572bd81d8eeSLaurent Vivier buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); 3573bd81d8eeSLaurent Vivier if (buf->f_bfree < ext4_r_blocks_count(es)) 3574ac27a0ecSDave Kleikamp buf->f_bavail = 0; 3575ac27a0ecSDave Kleikamp buf->f_files = le32_to_cpu(es->s_inodes_count); 357652d9f3b4SPeter Zijlstra buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); 35775e70030dSBadari Pulavarty es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); 3578617ba13bSMingming Cao buf->f_namelen = EXT4_NAME_LEN; 3579960cc398SPekka Enberg fsid = le64_to_cpup((void *)es->s_uuid) ^ 3580960cc398SPekka Enberg le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 3581960cc398SPekka Enberg buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 3582960cc398SPekka Enberg buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 3583ac27a0ecSDave Kleikamp return 0; 3584ac27a0ecSDave Kleikamp } 3585ac27a0ecSDave Kleikamp 3586ac27a0ecSDave Kleikamp /* Helper function for writing quotas on sync - we need to start transaction before quota file 3587ac27a0ecSDave Kleikamp * is locked for write. Otherwise the are possible deadlocks: 3588ac27a0ecSDave Kleikamp * Process 1 Process 2 3589617ba13bSMingming Cao * ext4_create() quota_sync() 3590dab291afSMingming Cao * jbd2_journal_start() write_dquot() 3591*a269eb18SJan Kara * vfs_dq_init() down(dqio_mutex) 3592dab291afSMingming Cao * down(dqio_mutex) jbd2_journal_start() 3593ac27a0ecSDave Kleikamp * 3594ac27a0ecSDave Kleikamp */ 3595ac27a0ecSDave Kleikamp 3596ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 3597ac27a0ecSDave Kleikamp 3598ac27a0ecSDave Kleikamp static inline struct inode *dquot_to_inode(struct dquot *dquot) 3599ac27a0ecSDave Kleikamp { 3600ac27a0ecSDave Kleikamp return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; 3601ac27a0ecSDave Kleikamp } 3602ac27a0ecSDave Kleikamp 3603617ba13bSMingming Cao static int ext4_write_dquot(struct dquot *dquot) 3604ac27a0ecSDave Kleikamp { 3605ac27a0ecSDave Kleikamp int ret, err; 3606ac27a0ecSDave Kleikamp handle_t *handle; 3607ac27a0ecSDave Kleikamp struct inode *inode; 3608ac27a0ecSDave Kleikamp 3609ac27a0ecSDave Kleikamp inode = dquot_to_inode(dquot); 3610617ba13bSMingming Cao handle = ext4_journal_start(inode, 3611617ba13bSMingming Cao EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 3612ac27a0ecSDave Kleikamp if (IS_ERR(handle)) 3613ac27a0ecSDave Kleikamp return PTR_ERR(handle); 3614ac27a0ecSDave Kleikamp ret = dquot_commit(dquot); 3615617ba13bSMingming Cao err = ext4_journal_stop(handle); 3616ac27a0ecSDave Kleikamp if (!ret) 3617ac27a0ecSDave Kleikamp ret = err; 3618ac27a0ecSDave Kleikamp return ret; 3619ac27a0ecSDave Kleikamp } 3620ac27a0ecSDave Kleikamp 3621617ba13bSMingming Cao static int ext4_acquire_dquot(struct dquot *dquot) 3622ac27a0ecSDave Kleikamp { 3623ac27a0ecSDave Kleikamp int ret, err; 3624ac27a0ecSDave Kleikamp handle_t *handle; 3625ac27a0ecSDave Kleikamp 3626617ba13bSMingming Cao handle = ext4_journal_start(dquot_to_inode(dquot), 3627617ba13bSMingming Cao EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 3628ac27a0ecSDave Kleikamp if (IS_ERR(handle)) 3629ac27a0ecSDave Kleikamp return PTR_ERR(handle); 3630ac27a0ecSDave Kleikamp ret = dquot_acquire(dquot); 3631617ba13bSMingming Cao err = ext4_journal_stop(handle); 3632ac27a0ecSDave Kleikamp if (!ret) 3633ac27a0ecSDave Kleikamp ret = err; 3634ac27a0ecSDave Kleikamp return ret; 3635ac27a0ecSDave Kleikamp } 3636ac27a0ecSDave Kleikamp 3637617ba13bSMingming Cao static int ext4_release_dquot(struct dquot *dquot) 3638ac27a0ecSDave Kleikamp { 3639ac27a0ecSDave Kleikamp int ret, err; 3640ac27a0ecSDave Kleikamp handle_t *handle; 3641ac27a0ecSDave Kleikamp 3642617ba13bSMingming Cao handle = ext4_journal_start(dquot_to_inode(dquot), 3643617ba13bSMingming Cao EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 36449c3013e9SJan Kara if (IS_ERR(handle)) { 36459c3013e9SJan Kara /* Release dquot anyway to avoid endless cycle in dqput() */ 36469c3013e9SJan Kara dquot_release(dquot); 3647ac27a0ecSDave Kleikamp return PTR_ERR(handle); 36489c3013e9SJan Kara } 3649ac27a0ecSDave Kleikamp ret = dquot_release(dquot); 3650617ba13bSMingming Cao err = ext4_journal_stop(handle); 3651ac27a0ecSDave Kleikamp if (!ret) 3652ac27a0ecSDave Kleikamp ret = err; 3653ac27a0ecSDave Kleikamp return ret; 3654ac27a0ecSDave Kleikamp } 3655ac27a0ecSDave Kleikamp 3656617ba13bSMingming Cao static int ext4_mark_dquot_dirty(struct dquot *dquot) 3657ac27a0ecSDave Kleikamp { 36582c8be6b2SJan Kara /* Are we journaling quotas? */ 3659617ba13bSMingming Cao if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || 3660617ba13bSMingming Cao EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { 3661ac27a0ecSDave Kleikamp dquot_mark_dquot_dirty(dquot); 3662617ba13bSMingming Cao return ext4_write_dquot(dquot); 3663ac27a0ecSDave Kleikamp } else { 3664ac27a0ecSDave Kleikamp return dquot_mark_dquot_dirty(dquot); 3665ac27a0ecSDave Kleikamp } 3666ac27a0ecSDave Kleikamp } 3667ac27a0ecSDave Kleikamp 3668617ba13bSMingming Cao static int ext4_write_info(struct super_block *sb, int type) 3669ac27a0ecSDave Kleikamp { 3670ac27a0ecSDave Kleikamp int ret, err; 3671ac27a0ecSDave Kleikamp handle_t *handle; 3672ac27a0ecSDave Kleikamp 3673ac27a0ecSDave Kleikamp /* Data block + inode block */ 3674617ba13bSMingming Cao handle = ext4_journal_start(sb->s_root->d_inode, 2); 3675ac27a0ecSDave Kleikamp if (IS_ERR(handle)) 3676ac27a0ecSDave Kleikamp return PTR_ERR(handle); 3677ac27a0ecSDave Kleikamp ret = dquot_commit_info(sb, type); 3678617ba13bSMingming Cao err = ext4_journal_stop(handle); 3679ac27a0ecSDave Kleikamp if (!ret) 3680ac27a0ecSDave Kleikamp ret = err; 3681ac27a0ecSDave Kleikamp return ret; 3682ac27a0ecSDave Kleikamp } 3683ac27a0ecSDave Kleikamp 3684ac27a0ecSDave Kleikamp /* 3685ac27a0ecSDave Kleikamp * Turn on quotas during mount time - we need to find 3686ac27a0ecSDave Kleikamp * the quota file and such... 3687ac27a0ecSDave Kleikamp */ 3688617ba13bSMingming Cao static int ext4_quota_on_mount(struct super_block *sb, int type) 3689ac27a0ecSDave Kleikamp { 3690617ba13bSMingming Cao return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], 3691617ba13bSMingming Cao EXT4_SB(sb)->s_jquota_fmt, type); 3692ac27a0ecSDave Kleikamp } 3693ac27a0ecSDave Kleikamp 3694ac27a0ecSDave Kleikamp /* 3695ac27a0ecSDave Kleikamp * Standard function to be called on quota_on 3696ac27a0ecSDave Kleikamp */ 3697617ba13bSMingming Cao static int ext4_quota_on(struct super_block *sb, int type, int format_id, 36988264613dSAl Viro char *name, int remount) 3699ac27a0ecSDave Kleikamp { 3700ac27a0ecSDave Kleikamp int err; 37018264613dSAl Viro struct path path; 3702ac27a0ecSDave Kleikamp 3703ac27a0ecSDave Kleikamp if (!test_opt(sb, QUOTA)) 3704ac27a0ecSDave Kleikamp return -EINVAL; 37058264613dSAl Viro /* When remounting, no checks are needed and in fact, name is NULL */ 37060623543bSJan Kara if (remount) 37078264613dSAl Viro return vfs_quota_on(sb, type, format_id, name, remount); 37080623543bSJan Kara 37098264613dSAl Viro err = kern_path(name, LOOKUP_FOLLOW, &path); 3710ac27a0ecSDave Kleikamp if (err) 3711ac27a0ecSDave Kleikamp return err; 37120623543bSJan Kara 3713ac27a0ecSDave Kleikamp /* Quotafile not on the same filesystem? */ 37148264613dSAl Viro if (path.mnt->mnt_sb != sb) { 37158264613dSAl Viro path_put(&path); 3716ac27a0ecSDave Kleikamp return -EXDEV; 3717ac27a0ecSDave Kleikamp } 37180623543bSJan Kara /* Journaling quota? */ 37190623543bSJan Kara if (EXT4_SB(sb)->s_qf_names[type]) { 37202b2d6d01STheodore Ts'o /* Quotafile not in fs root? */ 37218264613dSAl Viro if (path.dentry->d_parent != sb->s_root) 3722ac27a0ecSDave Kleikamp printk(KERN_WARNING 3723617ba13bSMingming Cao "EXT4-fs: Quota file not on filesystem root. " 37240623543bSJan Kara "Journaled quota will not work.\n"); 37250623543bSJan Kara } 37260623543bSJan Kara 37270623543bSJan Kara /* 37280623543bSJan Kara * When we journal data on quota file, we have to flush journal to see 37290623543bSJan Kara * all updates to the file when we bypass pagecache... 37300623543bSJan Kara */ 37310390131bSFrank Mayhar if (EXT4_SB(sb)->s_journal && 37320390131bSFrank Mayhar ext4_should_journal_data(path.dentry->d_inode)) { 37330623543bSJan Kara /* 37340623543bSJan Kara * We don't need to lock updates but journal_flush() could 37350623543bSJan Kara * otherwise be livelocked... 37360623543bSJan Kara */ 37370623543bSJan Kara jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 37387ffe1ea8SHidehiro Kawai err = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 37390623543bSJan Kara jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 37407ffe1ea8SHidehiro Kawai if (err) { 37418264613dSAl Viro path_put(&path); 37427ffe1ea8SHidehiro Kawai return err; 37437ffe1ea8SHidehiro Kawai } 37440623543bSJan Kara } 37450623543bSJan Kara 37468264613dSAl Viro err = vfs_quota_on_path(sb, type, format_id, &path); 37478264613dSAl Viro path_put(&path); 374877e69dacSAl Viro return err; 3749ac27a0ecSDave Kleikamp } 3750ac27a0ecSDave Kleikamp 3751ac27a0ecSDave Kleikamp /* Read data from quotafile - avoid pagecache and such because we cannot afford 3752ac27a0ecSDave Kleikamp * acquiring the locks... As quota files are never truncated and quota code 3753ac27a0ecSDave Kleikamp * itself serializes the operations (and noone else should touch the files) 3754ac27a0ecSDave Kleikamp * we don't have to be afraid of races */ 3755617ba13bSMingming Cao static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 3756ac27a0ecSDave Kleikamp size_t len, loff_t off) 3757ac27a0ecSDave Kleikamp { 3758ac27a0ecSDave Kleikamp struct inode *inode = sb_dqopt(sb)->files[type]; 3759725d26d3SAneesh Kumar K.V ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 3760ac27a0ecSDave Kleikamp int err = 0; 3761ac27a0ecSDave Kleikamp int offset = off & (sb->s_blocksize - 1); 3762ac27a0ecSDave Kleikamp int tocopy; 3763ac27a0ecSDave Kleikamp size_t toread; 3764ac27a0ecSDave Kleikamp struct buffer_head *bh; 3765ac27a0ecSDave Kleikamp loff_t i_size = i_size_read(inode); 3766ac27a0ecSDave Kleikamp 3767ac27a0ecSDave Kleikamp if (off > i_size) 3768ac27a0ecSDave Kleikamp return 0; 3769ac27a0ecSDave Kleikamp if (off+len > i_size) 3770ac27a0ecSDave Kleikamp len = i_size-off; 3771ac27a0ecSDave Kleikamp toread = len; 3772ac27a0ecSDave Kleikamp while (toread > 0) { 3773ac27a0ecSDave Kleikamp tocopy = sb->s_blocksize - offset < toread ? 3774ac27a0ecSDave Kleikamp sb->s_blocksize - offset : toread; 3775617ba13bSMingming Cao bh = ext4_bread(NULL, inode, blk, 0, &err); 3776ac27a0ecSDave Kleikamp if (err) 3777ac27a0ecSDave Kleikamp return err; 3778ac27a0ecSDave Kleikamp if (!bh) /* A hole? */ 3779ac27a0ecSDave Kleikamp memset(data, 0, tocopy); 3780ac27a0ecSDave Kleikamp else 3781ac27a0ecSDave Kleikamp memcpy(data, bh->b_data+offset, tocopy); 3782ac27a0ecSDave Kleikamp brelse(bh); 3783ac27a0ecSDave Kleikamp offset = 0; 3784ac27a0ecSDave Kleikamp toread -= tocopy; 3785ac27a0ecSDave Kleikamp data += tocopy; 3786ac27a0ecSDave Kleikamp blk++; 3787ac27a0ecSDave Kleikamp } 3788ac27a0ecSDave Kleikamp return len; 3789ac27a0ecSDave Kleikamp } 3790ac27a0ecSDave Kleikamp 3791ac27a0ecSDave Kleikamp /* Write to quotafile (we know the transaction is already started and has 3792ac27a0ecSDave Kleikamp * enough credits) */ 3793617ba13bSMingming Cao static ssize_t ext4_quota_write(struct super_block *sb, int type, 3794ac27a0ecSDave Kleikamp const char *data, size_t len, loff_t off) 3795ac27a0ecSDave Kleikamp { 3796ac27a0ecSDave Kleikamp struct inode *inode = sb_dqopt(sb)->files[type]; 3797725d26d3SAneesh Kumar K.V ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 3798ac27a0ecSDave Kleikamp int err = 0; 3799ac27a0ecSDave Kleikamp int offset = off & (sb->s_blocksize - 1); 3800ac27a0ecSDave Kleikamp int tocopy; 3801617ba13bSMingming Cao int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL; 3802ac27a0ecSDave Kleikamp size_t towrite = len; 3803ac27a0ecSDave Kleikamp struct buffer_head *bh; 3804ac27a0ecSDave Kleikamp handle_t *handle = journal_current_handle(); 3805ac27a0ecSDave Kleikamp 38060390131bSFrank Mayhar if (EXT4_SB(sb)->s_journal && !handle) { 3807e5f8eab8STheodore Ts'o printk(KERN_WARNING "EXT4-fs: Quota write (off=%llu, len=%llu)" 38089c3013e9SJan Kara " cancelled because transaction is not started.\n", 38099c3013e9SJan Kara (unsigned long long)off, (unsigned long long)len); 38109c3013e9SJan Kara return -EIO; 38119c3013e9SJan Kara } 3812ac27a0ecSDave Kleikamp mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 3813ac27a0ecSDave Kleikamp while (towrite > 0) { 3814ac27a0ecSDave Kleikamp tocopy = sb->s_blocksize - offset < towrite ? 3815ac27a0ecSDave Kleikamp sb->s_blocksize - offset : towrite; 3816617ba13bSMingming Cao bh = ext4_bread(handle, inode, blk, 1, &err); 3817ac27a0ecSDave Kleikamp if (!bh) 3818ac27a0ecSDave Kleikamp goto out; 3819ac27a0ecSDave Kleikamp if (journal_quota) { 3820617ba13bSMingming Cao err = ext4_journal_get_write_access(handle, bh); 3821ac27a0ecSDave Kleikamp if (err) { 3822ac27a0ecSDave Kleikamp brelse(bh); 3823ac27a0ecSDave Kleikamp goto out; 3824ac27a0ecSDave Kleikamp } 3825ac27a0ecSDave Kleikamp } 3826ac27a0ecSDave Kleikamp lock_buffer(bh); 3827ac27a0ecSDave Kleikamp memcpy(bh->b_data+offset, data, tocopy); 3828ac27a0ecSDave Kleikamp flush_dcache_page(bh->b_page); 3829ac27a0ecSDave Kleikamp unlock_buffer(bh); 3830ac27a0ecSDave Kleikamp if (journal_quota) 38310390131bSFrank Mayhar err = ext4_handle_dirty_metadata(handle, NULL, bh); 3832ac27a0ecSDave Kleikamp else { 3833ac27a0ecSDave Kleikamp /* Always do at least ordered writes for quotas */ 3834678aaf48SJan Kara err = ext4_jbd2_file_inode(handle, inode); 3835ac27a0ecSDave Kleikamp mark_buffer_dirty(bh); 3836ac27a0ecSDave Kleikamp } 3837ac27a0ecSDave Kleikamp brelse(bh); 3838ac27a0ecSDave Kleikamp if (err) 3839ac27a0ecSDave Kleikamp goto out; 3840ac27a0ecSDave Kleikamp offset = 0; 3841ac27a0ecSDave Kleikamp towrite -= tocopy; 3842ac27a0ecSDave Kleikamp data += tocopy; 3843ac27a0ecSDave Kleikamp blk++; 3844ac27a0ecSDave Kleikamp } 3845ac27a0ecSDave Kleikamp out: 38464d04e4fbSJan Kara if (len == towrite) { 38474d04e4fbSJan Kara mutex_unlock(&inode->i_mutex); 3848ac27a0ecSDave Kleikamp return err; 38494d04e4fbSJan Kara } 3850ac27a0ecSDave Kleikamp if (inode->i_size < off+len-towrite) { 3851ac27a0ecSDave Kleikamp i_size_write(inode, off+len-towrite); 3852617ba13bSMingming Cao EXT4_I(inode)->i_disksize = inode->i_size; 3853ac27a0ecSDave Kleikamp } 3854ac27a0ecSDave Kleikamp inode->i_mtime = inode->i_ctime = CURRENT_TIME; 3855617ba13bSMingming Cao ext4_mark_inode_dirty(handle, inode); 3856ac27a0ecSDave Kleikamp mutex_unlock(&inode->i_mutex); 3857ac27a0ecSDave Kleikamp return len - towrite; 3858ac27a0ecSDave Kleikamp } 3859ac27a0ecSDave Kleikamp 3860ac27a0ecSDave Kleikamp #endif 3861ac27a0ecSDave Kleikamp 3862617ba13bSMingming Cao static int ext4_get_sb(struct file_system_type *fs_type, 3863ac27a0ecSDave Kleikamp int flags, const char *dev_name, void *data, struct vfsmount *mnt) 3864ac27a0ecSDave Kleikamp { 3865617ba13bSMingming Cao return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt); 3866ac27a0ecSDave Kleikamp } 3867ac27a0ecSDave Kleikamp 38685e8814f2STheodore Ts'o #ifdef CONFIG_PROC_FS 38695e8814f2STheodore Ts'o static int ext4_ui_proc_show(struct seq_file *m, void *v) 38705e8814f2STheodore Ts'o { 38715e8814f2STheodore Ts'o unsigned int *p = m->private; 38725e8814f2STheodore Ts'o 38735e8814f2STheodore Ts'o seq_printf(m, "%u\n", *p); 38745e8814f2STheodore Ts'o return 0; 38755e8814f2STheodore Ts'o } 38765e8814f2STheodore Ts'o 38775e8814f2STheodore Ts'o static int ext4_ui_proc_open(struct inode *inode, struct file *file) 38785e8814f2STheodore Ts'o { 38795e8814f2STheodore Ts'o return single_open(file, ext4_ui_proc_show, PDE(inode)->data); 38805e8814f2STheodore Ts'o } 38815e8814f2STheodore Ts'o 38825e8814f2STheodore Ts'o static ssize_t ext4_ui_proc_write(struct file *file, const char __user *buf, 38835e8814f2STheodore Ts'o size_t cnt, loff_t *ppos) 38845e8814f2STheodore Ts'o { 388523475e26SRoel Kluin unsigned long *p = PDE(file->f_path.dentry->d_inode)->data; 38865e8814f2STheodore Ts'o char str[32]; 38875e8814f2STheodore Ts'o 38885e8814f2STheodore Ts'o if (cnt >= sizeof(str)) 38895e8814f2STheodore Ts'o return -EINVAL; 38905e8814f2STheodore Ts'o if (copy_from_user(str, buf, cnt)) 38915e8814f2STheodore Ts'o return -EFAULT; 389223475e26SRoel Kluin 389323475e26SRoel Kluin *p = simple_strtoul(str, NULL, 0); 38945e8814f2STheodore Ts'o return cnt; 38955e8814f2STheodore Ts'o } 38965e8814f2STheodore Ts'o 38975e8814f2STheodore Ts'o const struct file_operations ext4_ui_proc_fops = { 38985e8814f2STheodore Ts'o .owner = THIS_MODULE, 38995e8814f2STheodore Ts'o .open = ext4_ui_proc_open, 39005e8814f2STheodore Ts'o .read = seq_read, 39015e8814f2STheodore Ts'o .llseek = seq_lseek, 39025e8814f2STheodore Ts'o .release = single_release, 39035e8814f2STheodore Ts'o .write = ext4_ui_proc_write, 39045e8814f2STheodore Ts'o }; 39055e8814f2STheodore Ts'o #endif 39065e8814f2STheodore Ts'o 390703010a33STheodore Ts'o static struct file_system_type ext4_fs_type = { 3908ac27a0ecSDave Kleikamp .owner = THIS_MODULE, 390903010a33STheodore Ts'o .name = "ext4", 3910617ba13bSMingming Cao .get_sb = ext4_get_sb, 3911ac27a0ecSDave Kleikamp .kill_sb = kill_block_super, 3912ac27a0ecSDave Kleikamp .fs_flags = FS_REQUIRES_DEV, 3913ac27a0ecSDave Kleikamp }; 3914ac27a0ecSDave Kleikamp 391503010a33STheodore Ts'o #ifdef CONFIG_EXT4DEV_COMPAT 391603010a33STheodore Ts'o static int ext4dev_get_sb(struct file_system_type *fs_type, 391703010a33STheodore Ts'o int flags, const char *dev_name, void *data, struct vfsmount *mnt) 391803010a33STheodore Ts'o { 391903010a33STheodore Ts'o printk(KERN_WARNING "EXT4-fs: Update your userspace programs " 392003010a33STheodore Ts'o "to mount using ext4\n"); 392103010a33STheodore Ts'o printk(KERN_WARNING "EXT4-fs: ext4dev backwards compatibility " 392203010a33STheodore Ts'o "will go away by 2.6.31\n"); 392303010a33STheodore Ts'o return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt); 392403010a33STheodore Ts'o } 392503010a33STheodore Ts'o 392603010a33STheodore Ts'o static struct file_system_type ext4dev_fs_type = { 392703010a33STheodore Ts'o .owner = THIS_MODULE, 392803010a33STheodore Ts'o .name = "ext4dev", 392903010a33STheodore Ts'o .get_sb = ext4dev_get_sb, 393003010a33STheodore Ts'o .kill_sb = kill_block_super, 393103010a33STheodore Ts'o .fs_flags = FS_REQUIRES_DEV, 393203010a33STheodore Ts'o }; 393303010a33STheodore Ts'o MODULE_ALIAS("ext4dev"); 393403010a33STheodore Ts'o #endif 393503010a33STheodore Ts'o 3936617ba13bSMingming Cao static int __init init_ext4_fs(void) 3937ac27a0ecSDave Kleikamp { 3938c9de560dSAlex Tomas int err; 3939c9de560dSAlex Tomas 39403197ebdbSTheodore Ts'o ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj); 39413197ebdbSTheodore Ts'o if (!ext4_kset) 39423197ebdbSTheodore Ts'o return -ENOMEM; 39439f6200bbSTheodore Ts'o ext4_proc_root = proc_mkdir("fs/ext4", NULL); 3944c9de560dSAlex Tomas err = init_ext4_mballoc(); 3945ac27a0ecSDave Kleikamp if (err) 3946ac27a0ecSDave Kleikamp return err; 3947c9de560dSAlex Tomas 3948c9de560dSAlex Tomas err = init_ext4_xattr(); 3949c9de560dSAlex Tomas if (err) 3950c9de560dSAlex Tomas goto out2; 3951ac27a0ecSDave Kleikamp err = init_inodecache(); 3952ac27a0ecSDave Kleikamp if (err) 3953ac27a0ecSDave Kleikamp goto out1; 395403010a33STheodore Ts'o err = register_filesystem(&ext4_fs_type); 3955ac27a0ecSDave Kleikamp if (err) 3956ac27a0ecSDave Kleikamp goto out; 395703010a33STheodore Ts'o #ifdef CONFIG_EXT4DEV_COMPAT 395803010a33STheodore Ts'o err = register_filesystem(&ext4dev_fs_type); 395903010a33STheodore Ts'o if (err) { 396003010a33STheodore Ts'o unregister_filesystem(&ext4_fs_type); 396103010a33STheodore Ts'o goto out; 396203010a33STheodore Ts'o } 396303010a33STheodore Ts'o #endif 3964ac27a0ecSDave Kleikamp return 0; 3965ac27a0ecSDave Kleikamp out: 3966ac27a0ecSDave Kleikamp destroy_inodecache(); 3967ac27a0ecSDave Kleikamp out1: 3968617ba13bSMingming Cao exit_ext4_xattr(); 3969c9de560dSAlex Tomas out2: 3970c9de560dSAlex Tomas exit_ext4_mballoc(); 3971ac27a0ecSDave Kleikamp return err; 3972ac27a0ecSDave Kleikamp } 3973ac27a0ecSDave Kleikamp 3974617ba13bSMingming Cao static void __exit exit_ext4_fs(void) 3975ac27a0ecSDave Kleikamp { 397603010a33STheodore Ts'o unregister_filesystem(&ext4_fs_type); 397703010a33STheodore Ts'o #ifdef CONFIG_EXT4DEV_COMPAT 3978617ba13bSMingming Cao unregister_filesystem(&ext4dev_fs_type); 397903010a33STheodore Ts'o #endif 3980ac27a0ecSDave Kleikamp destroy_inodecache(); 3981617ba13bSMingming Cao exit_ext4_xattr(); 3982c9de560dSAlex Tomas exit_ext4_mballoc(); 39839f6200bbSTheodore Ts'o remove_proc_entry("fs/ext4", NULL); 39843197ebdbSTheodore Ts'o kset_unregister(ext4_kset); 3985ac27a0ecSDave Kleikamp } 3986ac27a0ecSDave Kleikamp 3987ac27a0ecSDave Kleikamp MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); 398883982b6fSTheodore Ts'o MODULE_DESCRIPTION("Fourth Extended Filesystem"); 3989ac27a0ecSDave Kleikamp MODULE_LICENSE("GPL"); 3990617ba13bSMingming Cao module_init(init_ext4_fs) 3991617ba13bSMingming Cao module_exit(exit_ext4_fs) 3992