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> 371330593eSVignesh Babu #include <linux/log2.h> 38717d50e4SAndreas Dilger #include <linux/crc16.h> 39ac27a0ecSDave Kleikamp #include <asm/uaccess.h> 40ac27a0ecSDave Kleikamp 413dcf5451SChristoph Hellwig #include "ext4.h" 423dcf5451SChristoph Hellwig #include "ext4_jbd2.h" 43ac27a0ecSDave Kleikamp #include "xattr.h" 44ac27a0ecSDave Kleikamp #include "acl.h" 45ac27a0ecSDave Kleikamp #include "namei.h" 46717d50e4SAndreas Dilger #include "group.h" 47ac27a0ecSDave Kleikamp 48617ba13bSMingming Cao static int ext4_load_journal(struct super_block *, struct ext4_super_block *, 49ac27a0ecSDave Kleikamp unsigned long journal_devnum); 50617ba13bSMingming Cao static int ext4_create_journal(struct super_block *, struct ext4_super_block *, 51ac27a0ecSDave Kleikamp unsigned int); 52617ba13bSMingming Cao static void ext4_commit_super(struct super_block *sb, 53*2b2d6d01STheodore Ts'o struct ext4_super_block *es, int sync); 54617ba13bSMingming Cao static void ext4_mark_recovery_complete(struct super_block *sb, 55617ba13bSMingming Cao struct ext4_super_block *es); 56617ba13bSMingming Cao static void ext4_clear_journal_err(struct super_block *sb, 57617ba13bSMingming Cao struct ext4_super_block *es); 58617ba13bSMingming Cao static int ext4_sync_fs(struct super_block *sb, int wait); 59617ba13bSMingming Cao static const char *ext4_decode_error(struct super_block *sb, int errno, 60ac27a0ecSDave Kleikamp char nbuf[16]); 61617ba13bSMingming Cao static int ext4_remount(struct super_block *sb, int *flags, char *data); 62617ba13bSMingming Cao static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf); 63617ba13bSMingming Cao static void ext4_unlockfs(struct super_block *sb); 64617ba13bSMingming Cao static void ext4_write_super(struct super_block *sb); 65617ba13bSMingming Cao static void ext4_write_super_lockfs(struct super_block *sb); 66ac27a0ecSDave Kleikamp 67bd81d8eeSLaurent Vivier 688fadc143SAlexandre Ratchov ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 698fadc143SAlexandre Ratchov struct ext4_group_desc *bg) 70bd81d8eeSLaurent Vivier { 713a14589cSAneesh Kumar K.V return le32_to_cpu(bg->bg_block_bitmap_lo) | 728fadc143SAlexandre Ratchov (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 738fadc143SAlexandre Ratchov (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); 74bd81d8eeSLaurent Vivier } 75bd81d8eeSLaurent Vivier 768fadc143SAlexandre Ratchov ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 778fadc143SAlexandre Ratchov struct ext4_group_desc *bg) 78bd81d8eeSLaurent Vivier { 795272f837SAneesh Kumar K.V return le32_to_cpu(bg->bg_inode_bitmap_lo) | 808fadc143SAlexandre Ratchov (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 818fadc143SAlexandre Ratchov (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); 82bd81d8eeSLaurent Vivier } 83bd81d8eeSLaurent Vivier 848fadc143SAlexandre Ratchov ext4_fsblk_t ext4_inode_table(struct super_block *sb, 858fadc143SAlexandre Ratchov struct ext4_group_desc *bg) 86bd81d8eeSLaurent Vivier { 875272f837SAneesh Kumar K.V return le32_to_cpu(bg->bg_inode_table_lo) | 888fadc143SAlexandre Ratchov (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 898fadc143SAlexandre Ratchov (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); 90bd81d8eeSLaurent Vivier } 91bd81d8eeSLaurent Vivier 928fadc143SAlexandre Ratchov void ext4_block_bitmap_set(struct super_block *sb, 938fadc143SAlexandre Ratchov struct ext4_group_desc *bg, ext4_fsblk_t blk) 94bd81d8eeSLaurent Vivier { 953a14589cSAneesh Kumar K.V bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); 968fadc143SAlexandre Ratchov if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 978fadc143SAlexandre Ratchov bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); 98bd81d8eeSLaurent Vivier } 99bd81d8eeSLaurent Vivier 1008fadc143SAlexandre Ratchov void ext4_inode_bitmap_set(struct super_block *sb, 1018fadc143SAlexandre Ratchov struct ext4_group_desc *bg, ext4_fsblk_t blk) 102bd81d8eeSLaurent Vivier { 1035272f837SAneesh Kumar K.V bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); 1048fadc143SAlexandre Ratchov if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 1058fadc143SAlexandre Ratchov bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); 106bd81d8eeSLaurent Vivier } 107bd81d8eeSLaurent Vivier 1088fadc143SAlexandre Ratchov void ext4_inode_table_set(struct super_block *sb, 1098fadc143SAlexandre Ratchov struct ext4_group_desc *bg, ext4_fsblk_t blk) 110bd81d8eeSLaurent Vivier { 1115272f837SAneesh Kumar K.V bg->bg_inode_table_lo = cpu_to_le32((u32)blk); 1128fadc143SAlexandre Ratchov if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 1138fadc143SAlexandre Ratchov bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); 114bd81d8eeSLaurent Vivier } 115bd81d8eeSLaurent Vivier 116ac27a0ecSDave Kleikamp /* 117dab291afSMingming Cao * Wrappers for jbd2_journal_start/end. 118ac27a0ecSDave Kleikamp * 119ac27a0ecSDave Kleikamp * The only special thing we need to do here is to make sure that all 120ac27a0ecSDave Kleikamp * journal_end calls result in the superblock being marked dirty, so 121ac27a0ecSDave Kleikamp * that sync() will call the filesystem's write_super callback if 122ac27a0ecSDave Kleikamp * appropriate. 123ac27a0ecSDave Kleikamp */ 124617ba13bSMingming Cao handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) 125ac27a0ecSDave Kleikamp { 126ac27a0ecSDave Kleikamp journal_t *journal; 127ac27a0ecSDave Kleikamp 128ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) 129ac27a0ecSDave Kleikamp return ERR_PTR(-EROFS); 130ac27a0ecSDave Kleikamp 131ac27a0ecSDave Kleikamp /* Special case here: if the journal has aborted behind our 132ac27a0ecSDave Kleikamp * backs (eg. EIO in the commit thread), then we still need to 133ac27a0ecSDave Kleikamp * take the FS itself readonly cleanly. */ 134617ba13bSMingming Cao journal = EXT4_SB(sb)->s_journal; 135ac27a0ecSDave Kleikamp if (is_journal_aborted(journal)) { 13646e665e9SHarvey Harrison ext4_abort(sb, __func__, 137ac27a0ecSDave Kleikamp "Detected aborted journal"); 138ac27a0ecSDave Kleikamp return ERR_PTR(-EROFS); 139ac27a0ecSDave Kleikamp } 140ac27a0ecSDave Kleikamp 141dab291afSMingming Cao return jbd2_journal_start(journal, nblocks); 142ac27a0ecSDave Kleikamp } 143ac27a0ecSDave Kleikamp 144ac27a0ecSDave Kleikamp /* 145ac27a0ecSDave Kleikamp * The only special thing we need to do here is to make sure that all 146dab291afSMingming Cao * jbd2_journal_stop calls result in the superblock being marked dirty, so 147ac27a0ecSDave Kleikamp * that sync() will call the filesystem's write_super callback if 148ac27a0ecSDave Kleikamp * appropriate. 149ac27a0ecSDave Kleikamp */ 150617ba13bSMingming Cao int __ext4_journal_stop(const char *where, handle_t *handle) 151ac27a0ecSDave Kleikamp { 152ac27a0ecSDave Kleikamp struct super_block *sb; 153ac27a0ecSDave Kleikamp int err; 154ac27a0ecSDave Kleikamp int rc; 155ac27a0ecSDave Kleikamp 156ac27a0ecSDave Kleikamp sb = handle->h_transaction->t_journal->j_private; 157ac27a0ecSDave Kleikamp err = handle->h_err; 158dab291afSMingming Cao rc = jbd2_journal_stop(handle); 159ac27a0ecSDave Kleikamp 160ac27a0ecSDave Kleikamp if (!err) 161ac27a0ecSDave Kleikamp err = rc; 162ac27a0ecSDave Kleikamp if (err) 163617ba13bSMingming Cao __ext4_std_error(sb, where, err); 164ac27a0ecSDave Kleikamp return err; 165ac27a0ecSDave Kleikamp } 166ac27a0ecSDave Kleikamp 167617ba13bSMingming Cao void ext4_journal_abort_handle(const char *caller, const char *err_fn, 168ac27a0ecSDave Kleikamp struct buffer_head *bh, handle_t *handle, int err) 169ac27a0ecSDave Kleikamp { 170ac27a0ecSDave Kleikamp char nbuf[16]; 171617ba13bSMingming Cao const char *errstr = ext4_decode_error(NULL, err, nbuf); 172ac27a0ecSDave Kleikamp 173ac27a0ecSDave Kleikamp if (bh) 174ac27a0ecSDave Kleikamp BUFFER_TRACE(bh, "abort"); 175ac27a0ecSDave Kleikamp 176ac27a0ecSDave Kleikamp if (!handle->h_err) 177ac27a0ecSDave Kleikamp handle->h_err = err; 178ac27a0ecSDave Kleikamp 179ac27a0ecSDave Kleikamp if (is_handle_aborted(handle)) 180ac27a0ecSDave Kleikamp return; 181ac27a0ecSDave Kleikamp 182ac27a0ecSDave Kleikamp printk(KERN_ERR "%s: aborting transaction: %s in %s\n", 183ac27a0ecSDave Kleikamp caller, errstr, err_fn); 184ac27a0ecSDave Kleikamp 185dab291afSMingming Cao jbd2_journal_abort_handle(handle); 186ac27a0ecSDave Kleikamp } 187ac27a0ecSDave Kleikamp 188ac27a0ecSDave Kleikamp /* Deal with the reporting of failure conditions on a filesystem such as 189ac27a0ecSDave Kleikamp * inconsistencies detected or read IO failures. 190ac27a0ecSDave Kleikamp * 191ac27a0ecSDave Kleikamp * On ext2, we can store the error state of the filesystem in the 192617ba13bSMingming Cao * superblock. That is not possible on ext4, because we may have other 193ac27a0ecSDave Kleikamp * write ordering constraints on the superblock which prevent us from 194ac27a0ecSDave Kleikamp * writing it out straight away; and given that the journal is about to 195ac27a0ecSDave Kleikamp * be aborted, we can't rely on the current, or future, transactions to 196ac27a0ecSDave Kleikamp * write out the superblock safely. 197ac27a0ecSDave Kleikamp * 198dab291afSMingming Cao * We'll just use the jbd2_journal_abort() error code to record an error in 199ac27a0ecSDave Kleikamp * the journal instead. On recovery, the journal will compain about 200ac27a0ecSDave Kleikamp * that error until we've noted it down and cleared it. 201ac27a0ecSDave Kleikamp */ 202ac27a0ecSDave Kleikamp 203617ba13bSMingming Cao static void ext4_handle_error(struct super_block *sb) 204ac27a0ecSDave Kleikamp { 205617ba13bSMingming Cao struct ext4_super_block *es = EXT4_SB(sb)->s_es; 206ac27a0ecSDave Kleikamp 207617ba13bSMingming Cao EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 208617ba13bSMingming Cao es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 209ac27a0ecSDave Kleikamp 210ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) 211ac27a0ecSDave Kleikamp return; 212ac27a0ecSDave Kleikamp 213ac27a0ecSDave Kleikamp if (!test_opt(sb, ERRORS_CONT)) { 214617ba13bSMingming Cao journal_t *journal = EXT4_SB(sb)->s_journal; 215ac27a0ecSDave Kleikamp 216617ba13bSMingming Cao EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; 217ac27a0ecSDave Kleikamp if (journal) 218dab291afSMingming Cao jbd2_journal_abort(journal, -EIO); 219ac27a0ecSDave Kleikamp } 220ac27a0ecSDave Kleikamp if (test_opt(sb, ERRORS_RO)) { 221ac27a0ecSDave Kleikamp printk(KERN_CRIT "Remounting filesystem read-only\n"); 222ac27a0ecSDave Kleikamp sb->s_flags |= MS_RDONLY; 223ac27a0ecSDave Kleikamp } 224617ba13bSMingming Cao ext4_commit_super(sb, es, 1); 225ac27a0ecSDave Kleikamp if (test_opt(sb, ERRORS_PANIC)) 226617ba13bSMingming Cao panic("EXT4-fs (device %s): panic forced after error\n", 227ac27a0ecSDave Kleikamp sb->s_id); 228ac27a0ecSDave Kleikamp } 229ac27a0ecSDave Kleikamp 230617ba13bSMingming Cao void ext4_error(struct super_block *sb, const char *function, 231ac27a0ecSDave Kleikamp const char *fmt, ...) 232ac27a0ecSDave Kleikamp { 233ac27a0ecSDave Kleikamp va_list args; 234ac27a0ecSDave Kleikamp 235ac27a0ecSDave Kleikamp va_start(args, fmt); 236617ba13bSMingming Cao printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function); 237ac27a0ecSDave Kleikamp vprintk(fmt, args); 238ac27a0ecSDave Kleikamp printk("\n"); 239ac27a0ecSDave Kleikamp va_end(args); 240ac27a0ecSDave Kleikamp 241617ba13bSMingming Cao ext4_handle_error(sb); 242ac27a0ecSDave Kleikamp } 243ac27a0ecSDave Kleikamp 244617ba13bSMingming Cao static const char *ext4_decode_error(struct super_block *sb, int errno, 245ac27a0ecSDave Kleikamp char nbuf[16]) 246ac27a0ecSDave Kleikamp { 247ac27a0ecSDave Kleikamp char *errstr = NULL; 248ac27a0ecSDave Kleikamp 249ac27a0ecSDave Kleikamp switch (errno) { 250ac27a0ecSDave Kleikamp case -EIO: 251ac27a0ecSDave Kleikamp errstr = "IO failure"; 252ac27a0ecSDave Kleikamp break; 253ac27a0ecSDave Kleikamp case -ENOMEM: 254ac27a0ecSDave Kleikamp errstr = "Out of memory"; 255ac27a0ecSDave Kleikamp break; 256ac27a0ecSDave Kleikamp case -EROFS: 257dab291afSMingming Cao if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT) 258ac27a0ecSDave Kleikamp errstr = "Journal has aborted"; 259ac27a0ecSDave Kleikamp else 260ac27a0ecSDave Kleikamp errstr = "Readonly filesystem"; 261ac27a0ecSDave Kleikamp break; 262ac27a0ecSDave Kleikamp default: 263ac27a0ecSDave Kleikamp /* If the caller passed in an extra buffer for unknown 264ac27a0ecSDave Kleikamp * errors, textualise them now. Else we just return 265ac27a0ecSDave Kleikamp * NULL. */ 266ac27a0ecSDave Kleikamp if (nbuf) { 267ac27a0ecSDave Kleikamp /* Check for truncated error codes... */ 268ac27a0ecSDave Kleikamp if (snprintf(nbuf, 16, "error %d", -errno) >= 0) 269ac27a0ecSDave Kleikamp errstr = nbuf; 270ac27a0ecSDave Kleikamp } 271ac27a0ecSDave Kleikamp break; 272ac27a0ecSDave Kleikamp } 273ac27a0ecSDave Kleikamp 274ac27a0ecSDave Kleikamp return errstr; 275ac27a0ecSDave Kleikamp } 276ac27a0ecSDave Kleikamp 277617ba13bSMingming Cao /* __ext4_std_error decodes expected errors from journaling functions 278ac27a0ecSDave Kleikamp * automatically and invokes the appropriate error response. */ 279ac27a0ecSDave Kleikamp 280*2b2d6d01STheodore Ts'o void __ext4_std_error(struct super_block *sb, const char *function, int errno) 281ac27a0ecSDave Kleikamp { 282ac27a0ecSDave Kleikamp char nbuf[16]; 283ac27a0ecSDave Kleikamp const char *errstr; 284ac27a0ecSDave Kleikamp 285ac27a0ecSDave Kleikamp /* Special case: if the error is EROFS, and we're not already 286ac27a0ecSDave Kleikamp * inside a transaction, then there's really no point in logging 287ac27a0ecSDave Kleikamp * an error. */ 288ac27a0ecSDave Kleikamp if (errno == -EROFS && journal_current_handle() == NULL && 289ac27a0ecSDave Kleikamp (sb->s_flags & MS_RDONLY)) 290ac27a0ecSDave Kleikamp return; 291ac27a0ecSDave Kleikamp 292617ba13bSMingming Cao errstr = ext4_decode_error(sb, errno, nbuf); 293617ba13bSMingming Cao printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n", 294ac27a0ecSDave Kleikamp sb->s_id, function, errstr); 295ac27a0ecSDave Kleikamp 296617ba13bSMingming Cao ext4_handle_error(sb); 297ac27a0ecSDave Kleikamp } 298ac27a0ecSDave Kleikamp 299ac27a0ecSDave Kleikamp /* 300617ba13bSMingming Cao * ext4_abort is a much stronger failure handler than ext4_error. The 301ac27a0ecSDave Kleikamp * abort function may be used to deal with unrecoverable failures such 302ac27a0ecSDave Kleikamp * as journal IO errors or ENOMEM at a critical moment in log management. 303ac27a0ecSDave Kleikamp * 304ac27a0ecSDave Kleikamp * We unconditionally force the filesystem into an ABORT|READONLY state, 305ac27a0ecSDave Kleikamp * unless the error response on the fs has been set to panic in which 306ac27a0ecSDave Kleikamp * case we take the easy way out and panic immediately. 307ac27a0ecSDave Kleikamp */ 308ac27a0ecSDave Kleikamp 309617ba13bSMingming Cao void ext4_abort(struct super_block *sb, const char *function, 310ac27a0ecSDave Kleikamp const char *fmt, ...) 311ac27a0ecSDave Kleikamp { 312ac27a0ecSDave Kleikamp va_list args; 313ac27a0ecSDave Kleikamp 314617ba13bSMingming Cao printk(KERN_CRIT "ext4_abort called.\n"); 315ac27a0ecSDave Kleikamp 316ac27a0ecSDave Kleikamp va_start(args, fmt); 317617ba13bSMingming Cao printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function); 318ac27a0ecSDave Kleikamp vprintk(fmt, args); 319ac27a0ecSDave Kleikamp printk("\n"); 320ac27a0ecSDave Kleikamp va_end(args); 321ac27a0ecSDave Kleikamp 322ac27a0ecSDave Kleikamp if (test_opt(sb, ERRORS_PANIC)) 323617ba13bSMingming Cao panic("EXT4-fs panic from previous error\n"); 324ac27a0ecSDave Kleikamp 325ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) 326ac27a0ecSDave Kleikamp return; 327ac27a0ecSDave Kleikamp 328ac27a0ecSDave Kleikamp printk(KERN_CRIT "Remounting filesystem read-only\n"); 329617ba13bSMingming Cao EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 330ac27a0ecSDave Kleikamp sb->s_flags |= MS_RDONLY; 331617ba13bSMingming Cao EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; 332dab291afSMingming Cao jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); 333ac27a0ecSDave Kleikamp } 334ac27a0ecSDave Kleikamp 335617ba13bSMingming Cao void ext4_warning(struct super_block *sb, const char *function, 336ac27a0ecSDave Kleikamp const char *fmt, ...) 337ac27a0ecSDave Kleikamp { 338ac27a0ecSDave Kleikamp va_list args; 339ac27a0ecSDave Kleikamp 340ac27a0ecSDave Kleikamp va_start(args, fmt); 341617ba13bSMingming Cao printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ", 342ac27a0ecSDave Kleikamp sb->s_id, function); 343ac27a0ecSDave Kleikamp vprintk(fmt, args); 344ac27a0ecSDave Kleikamp printk("\n"); 345ac27a0ecSDave Kleikamp va_end(args); 346ac27a0ecSDave Kleikamp } 347ac27a0ecSDave Kleikamp 348617ba13bSMingming Cao void ext4_update_dynamic_rev(struct super_block *sb) 349ac27a0ecSDave Kleikamp { 350617ba13bSMingming Cao struct ext4_super_block *es = EXT4_SB(sb)->s_es; 351ac27a0ecSDave Kleikamp 352617ba13bSMingming Cao if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) 353ac27a0ecSDave Kleikamp return; 354ac27a0ecSDave Kleikamp 35546e665e9SHarvey Harrison ext4_warning(sb, __func__, 356ac27a0ecSDave Kleikamp "updating to rev %d because of new feature flag, " 357ac27a0ecSDave Kleikamp "running e2fsck is recommended", 358617ba13bSMingming Cao EXT4_DYNAMIC_REV); 359ac27a0ecSDave Kleikamp 360617ba13bSMingming Cao es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); 361617ba13bSMingming Cao es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); 362617ba13bSMingming Cao es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); 363ac27a0ecSDave Kleikamp /* leave es->s_feature_*compat flags alone */ 364ac27a0ecSDave Kleikamp /* es->s_uuid will be set by e2fsck if empty */ 365ac27a0ecSDave Kleikamp 366ac27a0ecSDave Kleikamp /* 367ac27a0ecSDave Kleikamp * The rest of the superblock fields should be zero, and if not it 368ac27a0ecSDave Kleikamp * means they are likely already in use, so leave them alone. We 369ac27a0ecSDave Kleikamp * can leave it up to e2fsck to clean up any inconsistencies there. 370ac27a0ecSDave Kleikamp */ 371ac27a0ecSDave Kleikamp } 372ac27a0ecSDave Kleikamp 37399e6f829SAneesh Kumar K.V int ext4_update_compat_feature(handle_t *handle, 37499e6f829SAneesh Kumar K.V struct super_block *sb, __u32 compat) 37599e6f829SAneesh Kumar K.V { 37699e6f829SAneesh Kumar K.V int err = 0; 37799e6f829SAneesh Kumar K.V if (!EXT4_HAS_COMPAT_FEATURE(sb, compat)) { 37899e6f829SAneesh Kumar K.V err = ext4_journal_get_write_access(handle, 37999e6f829SAneesh Kumar K.V EXT4_SB(sb)->s_sbh); 38099e6f829SAneesh Kumar K.V if (err) 38199e6f829SAneesh Kumar K.V return err; 38299e6f829SAneesh Kumar K.V EXT4_SET_COMPAT_FEATURE(sb, compat); 38399e6f829SAneesh Kumar K.V sb->s_dirt = 1; 38499e6f829SAneesh Kumar K.V handle->h_sync = 1; 38599e6f829SAneesh Kumar K.V BUFFER_TRACE(EXT4_SB(sb)->s_sbh, 38699e6f829SAneesh Kumar K.V "call ext4_journal_dirty_met adata"); 38799e6f829SAneesh Kumar K.V err = ext4_journal_dirty_metadata(handle, 38899e6f829SAneesh Kumar K.V EXT4_SB(sb)->s_sbh); 38999e6f829SAneesh Kumar K.V } 39099e6f829SAneesh Kumar K.V return err; 39199e6f829SAneesh Kumar K.V } 39299e6f829SAneesh Kumar K.V 39399e6f829SAneesh Kumar K.V int ext4_update_rocompat_feature(handle_t *handle, 39499e6f829SAneesh Kumar K.V struct super_block *sb, __u32 rocompat) 39599e6f829SAneesh Kumar K.V { 39699e6f829SAneesh Kumar K.V int err = 0; 39799e6f829SAneesh Kumar K.V if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, rocompat)) { 39899e6f829SAneesh Kumar K.V err = ext4_journal_get_write_access(handle, 39999e6f829SAneesh Kumar K.V EXT4_SB(sb)->s_sbh); 40099e6f829SAneesh Kumar K.V if (err) 40199e6f829SAneesh Kumar K.V return err; 40299e6f829SAneesh Kumar K.V EXT4_SET_RO_COMPAT_FEATURE(sb, rocompat); 40399e6f829SAneesh Kumar K.V sb->s_dirt = 1; 40499e6f829SAneesh Kumar K.V handle->h_sync = 1; 40599e6f829SAneesh Kumar K.V BUFFER_TRACE(EXT4_SB(sb)->s_sbh, 40699e6f829SAneesh Kumar K.V "call ext4_journal_dirty_met adata"); 40799e6f829SAneesh Kumar K.V err = ext4_journal_dirty_metadata(handle, 40899e6f829SAneesh Kumar K.V EXT4_SB(sb)->s_sbh); 40999e6f829SAneesh Kumar K.V } 41099e6f829SAneesh Kumar K.V return err; 41199e6f829SAneesh Kumar K.V } 41299e6f829SAneesh Kumar K.V 41399e6f829SAneesh Kumar K.V int ext4_update_incompat_feature(handle_t *handle, 41499e6f829SAneesh Kumar K.V struct super_block *sb, __u32 incompat) 41599e6f829SAneesh Kumar K.V { 41699e6f829SAneesh Kumar K.V int err = 0; 41799e6f829SAneesh Kumar K.V if (!EXT4_HAS_INCOMPAT_FEATURE(sb, incompat)) { 41899e6f829SAneesh Kumar K.V err = ext4_journal_get_write_access(handle, 41999e6f829SAneesh Kumar K.V EXT4_SB(sb)->s_sbh); 42099e6f829SAneesh Kumar K.V if (err) 42199e6f829SAneesh Kumar K.V return err; 42299e6f829SAneesh Kumar K.V EXT4_SET_INCOMPAT_FEATURE(sb, incompat); 42399e6f829SAneesh Kumar K.V sb->s_dirt = 1; 42499e6f829SAneesh Kumar K.V handle->h_sync = 1; 42599e6f829SAneesh Kumar K.V BUFFER_TRACE(EXT4_SB(sb)->s_sbh, 42699e6f829SAneesh Kumar K.V "call ext4_journal_dirty_met adata"); 42799e6f829SAneesh Kumar K.V err = ext4_journal_dirty_metadata(handle, 42899e6f829SAneesh Kumar K.V EXT4_SB(sb)->s_sbh); 42999e6f829SAneesh Kumar K.V } 43099e6f829SAneesh Kumar K.V return err; 43199e6f829SAneesh Kumar K.V } 43299e6f829SAneesh Kumar K.V 433ac27a0ecSDave Kleikamp /* 434ac27a0ecSDave Kleikamp * Open the external journal device 435ac27a0ecSDave Kleikamp */ 436617ba13bSMingming Cao static struct block_device *ext4_blkdev_get(dev_t dev) 437ac27a0ecSDave Kleikamp { 438ac27a0ecSDave Kleikamp struct block_device *bdev; 439ac27a0ecSDave Kleikamp char b[BDEVNAME_SIZE]; 440ac27a0ecSDave Kleikamp 441ac27a0ecSDave Kleikamp bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); 442ac27a0ecSDave Kleikamp if (IS_ERR(bdev)) 443ac27a0ecSDave Kleikamp goto fail; 444ac27a0ecSDave Kleikamp return bdev; 445ac27a0ecSDave Kleikamp 446ac27a0ecSDave Kleikamp fail: 447617ba13bSMingming Cao printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n", 448ac27a0ecSDave Kleikamp __bdevname(dev, b), PTR_ERR(bdev)); 449ac27a0ecSDave Kleikamp return NULL; 450ac27a0ecSDave Kleikamp } 451ac27a0ecSDave Kleikamp 452ac27a0ecSDave Kleikamp /* 453ac27a0ecSDave Kleikamp * Release the journal device 454ac27a0ecSDave Kleikamp */ 455617ba13bSMingming Cao static int ext4_blkdev_put(struct block_device *bdev) 456ac27a0ecSDave Kleikamp { 457ac27a0ecSDave Kleikamp bd_release(bdev); 458ac27a0ecSDave Kleikamp return blkdev_put(bdev); 459ac27a0ecSDave Kleikamp } 460ac27a0ecSDave Kleikamp 461617ba13bSMingming Cao static int ext4_blkdev_remove(struct ext4_sb_info *sbi) 462ac27a0ecSDave Kleikamp { 463ac27a0ecSDave Kleikamp struct block_device *bdev; 464ac27a0ecSDave Kleikamp int ret = -ENODEV; 465ac27a0ecSDave Kleikamp 466ac27a0ecSDave Kleikamp bdev = sbi->journal_bdev; 467ac27a0ecSDave Kleikamp if (bdev) { 468617ba13bSMingming Cao ret = ext4_blkdev_put(bdev); 469ac27a0ecSDave Kleikamp sbi->journal_bdev = NULL; 470ac27a0ecSDave Kleikamp } 471ac27a0ecSDave Kleikamp return ret; 472ac27a0ecSDave Kleikamp } 473ac27a0ecSDave Kleikamp 474ac27a0ecSDave Kleikamp static inline struct inode *orphan_list_entry(struct list_head *l) 475ac27a0ecSDave Kleikamp { 476617ba13bSMingming Cao return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; 477ac27a0ecSDave Kleikamp } 478ac27a0ecSDave Kleikamp 479617ba13bSMingming Cao static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) 480ac27a0ecSDave Kleikamp { 481ac27a0ecSDave Kleikamp struct list_head *l; 482ac27a0ecSDave Kleikamp 483ac27a0ecSDave Kleikamp printk(KERN_ERR "sb orphan head is %d\n", 484ac27a0ecSDave Kleikamp le32_to_cpu(sbi->s_es->s_last_orphan)); 485ac27a0ecSDave Kleikamp 486ac27a0ecSDave Kleikamp printk(KERN_ERR "sb_info orphan list:\n"); 487ac27a0ecSDave Kleikamp list_for_each(l, &sbi->s_orphan) { 488ac27a0ecSDave Kleikamp struct inode *inode = orphan_list_entry(l); 489ac27a0ecSDave Kleikamp printk(KERN_ERR " " 490ac27a0ecSDave Kleikamp "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", 491ac27a0ecSDave Kleikamp inode->i_sb->s_id, inode->i_ino, inode, 492ac27a0ecSDave Kleikamp inode->i_mode, inode->i_nlink, 493ac27a0ecSDave Kleikamp NEXT_ORPHAN(inode)); 494ac27a0ecSDave Kleikamp } 495ac27a0ecSDave Kleikamp } 496ac27a0ecSDave Kleikamp 497617ba13bSMingming Cao static void ext4_put_super(struct super_block *sb) 498ac27a0ecSDave Kleikamp { 499617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 500617ba13bSMingming Cao struct ext4_super_block *es = sbi->s_es; 501ac27a0ecSDave Kleikamp int i; 502ac27a0ecSDave Kleikamp 503c9de560dSAlex Tomas ext4_mb_release(sb); 504a86c6181SAlex Tomas ext4_ext_release(sb); 505617ba13bSMingming Cao ext4_xattr_put_super(sb); 506dab291afSMingming Cao jbd2_journal_destroy(sbi->s_journal); 50747b4a50bSJan Kara sbi->s_journal = NULL; 508ac27a0ecSDave Kleikamp if (!(sb->s_flags & MS_RDONLY)) { 509617ba13bSMingming Cao EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 510ac27a0ecSDave Kleikamp es->s_state = cpu_to_le16(sbi->s_mount_state); 511ac27a0ecSDave Kleikamp BUFFER_TRACE(sbi->s_sbh, "marking dirty"); 512ac27a0ecSDave Kleikamp mark_buffer_dirty(sbi->s_sbh); 513617ba13bSMingming Cao ext4_commit_super(sb, es, 1); 514ac27a0ecSDave Kleikamp } 515ac27a0ecSDave Kleikamp 516ac27a0ecSDave Kleikamp for (i = 0; i < sbi->s_gdb_count; i++) 517ac27a0ecSDave Kleikamp brelse(sbi->s_group_desc[i]); 518ac27a0ecSDave Kleikamp kfree(sbi->s_group_desc); 519772cb7c8SJose R. Santos kfree(sbi->s_flex_groups); 520ac27a0ecSDave Kleikamp percpu_counter_destroy(&sbi->s_freeblocks_counter); 521ac27a0ecSDave Kleikamp percpu_counter_destroy(&sbi->s_freeinodes_counter); 522ac27a0ecSDave Kleikamp percpu_counter_destroy(&sbi->s_dirs_counter); 523ac27a0ecSDave Kleikamp brelse(sbi->s_sbh); 524ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 525ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) 526ac27a0ecSDave Kleikamp kfree(sbi->s_qf_names[i]); 527ac27a0ecSDave Kleikamp #endif 528ac27a0ecSDave Kleikamp 529ac27a0ecSDave Kleikamp /* Debugging code just in case the in-memory inode orphan list 530ac27a0ecSDave Kleikamp * isn't empty. The on-disk one can be non-empty if we've 531ac27a0ecSDave Kleikamp * detected an error and taken the fs readonly, but the 532ac27a0ecSDave Kleikamp * in-memory list had better be clean by this point. */ 533ac27a0ecSDave Kleikamp if (!list_empty(&sbi->s_orphan)) 534ac27a0ecSDave Kleikamp dump_orphan_list(sb, sbi); 535ac27a0ecSDave Kleikamp J_ASSERT(list_empty(&sbi->s_orphan)); 536ac27a0ecSDave Kleikamp 537f98393a6SPeter Zijlstra invalidate_bdev(sb->s_bdev); 538ac27a0ecSDave Kleikamp if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { 539ac27a0ecSDave Kleikamp /* 540ac27a0ecSDave Kleikamp * Invalidate the journal device's buffers. We don't want them 541ac27a0ecSDave Kleikamp * floating about in memory - the physical journal device may 542ac27a0ecSDave Kleikamp * hotswapped, and it breaks the `ro-after' testing code. 543ac27a0ecSDave Kleikamp */ 544ac27a0ecSDave Kleikamp sync_blockdev(sbi->journal_bdev); 545f98393a6SPeter Zijlstra invalidate_bdev(sbi->journal_bdev); 546617ba13bSMingming Cao ext4_blkdev_remove(sbi); 547ac27a0ecSDave Kleikamp } 548ac27a0ecSDave Kleikamp sb->s_fs_info = NULL; 549ac27a0ecSDave Kleikamp kfree(sbi); 550ac27a0ecSDave Kleikamp return; 551ac27a0ecSDave Kleikamp } 552ac27a0ecSDave Kleikamp 553e18b890bSChristoph Lameter static struct kmem_cache *ext4_inode_cachep; 554ac27a0ecSDave Kleikamp 555ac27a0ecSDave Kleikamp /* 556ac27a0ecSDave Kleikamp * Called inside transaction, so use GFP_NOFS 557ac27a0ecSDave Kleikamp */ 558617ba13bSMingming Cao static struct inode *ext4_alloc_inode(struct super_block *sb) 559ac27a0ecSDave Kleikamp { 560617ba13bSMingming Cao struct ext4_inode_info *ei; 561ac27a0ecSDave Kleikamp 562e6b4f8daSChristoph Lameter ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); 563ac27a0ecSDave Kleikamp if (!ei) 564ac27a0ecSDave Kleikamp return NULL; 565617ba13bSMingming Cao #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 566617ba13bSMingming Cao ei->i_acl = EXT4_ACL_NOT_CACHED; 567617ba13bSMingming Cao ei->i_default_acl = EXT4_ACL_NOT_CACHED; 568ac27a0ecSDave Kleikamp #endif 569ac27a0ecSDave Kleikamp ei->i_block_alloc_info = NULL; 570ac27a0ecSDave Kleikamp ei->vfs_inode.i_version = 1; 571a86c6181SAlex Tomas memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); 572c9de560dSAlex Tomas INIT_LIST_HEAD(&ei->i_prealloc_list); 573c9de560dSAlex Tomas spin_lock_init(&ei->i_prealloc_lock); 574678aaf48SJan Kara jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode); 575d2a17637SMingming Cao ei->i_reserved_data_blocks = 0; 576d2a17637SMingming Cao ei->i_reserved_meta_blocks = 0; 577d2a17637SMingming Cao ei->i_allocated_meta_blocks = 0; 578d2a17637SMingming Cao ei->i_delalloc_reserved_flag = 0; 579d2a17637SMingming Cao spin_lock_init(&(ei->i_block_reservation_lock)); 580ac27a0ecSDave Kleikamp return &ei->vfs_inode; 581ac27a0ecSDave Kleikamp } 582ac27a0ecSDave Kleikamp 583617ba13bSMingming Cao static void ext4_destroy_inode(struct inode *inode) 584ac27a0ecSDave Kleikamp { 5859f7dd93dSVasily Averin if (!list_empty(&(EXT4_I(inode)->i_orphan))) { 5869f7dd93dSVasily Averin printk("EXT4 Inode %p: orphan list check failed!\n", 5879f7dd93dSVasily Averin EXT4_I(inode)); 5889f7dd93dSVasily Averin print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, 5899f7dd93dSVasily Averin EXT4_I(inode), sizeof(struct ext4_inode_info), 5909f7dd93dSVasily Averin true); 5919f7dd93dSVasily Averin dump_stack(); 5929f7dd93dSVasily Averin } 593617ba13bSMingming Cao kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); 594ac27a0ecSDave Kleikamp } 595ac27a0ecSDave Kleikamp 59651cc5068SAlexey Dobriyan static void init_once(void *foo) 597ac27a0ecSDave Kleikamp { 598617ba13bSMingming Cao struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; 599ac27a0ecSDave Kleikamp 600ac27a0ecSDave Kleikamp INIT_LIST_HEAD(&ei->i_orphan); 601617ba13bSMingming Cao #ifdef CONFIG_EXT4DEV_FS_XATTR 602ac27a0ecSDave Kleikamp init_rwsem(&ei->xattr_sem); 603ac27a0ecSDave Kleikamp #endif 6040e855ac8SAneesh Kumar K.V init_rwsem(&ei->i_data_sem); 605ac27a0ecSDave Kleikamp inode_init_once(&ei->vfs_inode); 606ac27a0ecSDave Kleikamp } 607ac27a0ecSDave Kleikamp 608ac27a0ecSDave Kleikamp static int init_inodecache(void) 609ac27a0ecSDave Kleikamp { 610617ba13bSMingming Cao ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", 611617ba13bSMingming Cao sizeof(struct ext4_inode_info), 612ac27a0ecSDave Kleikamp 0, (SLAB_RECLAIM_ACCOUNT| 613ac27a0ecSDave Kleikamp SLAB_MEM_SPREAD), 61420c2df83SPaul Mundt init_once); 615617ba13bSMingming Cao if (ext4_inode_cachep == NULL) 616ac27a0ecSDave Kleikamp return -ENOMEM; 617ac27a0ecSDave Kleikamp return 0; 618ac27a0ecSDave Kleikamp } 619ac27a0ecSDave Kleikamp 620ac27a0ecSDave Kleikamp static void destroy_inodecache(void) 621ac27a0ecSDave Kleikamp { 622617ba13bSMingming Cao kmem_cache_destroy(ext4_inode_cachep); 623ac27a0ecSDave Kleikamp } 624ac27a0ecSDave Kleikamp 625617ba13bSMingming Cao static void ext4_clear_inode(struct inode *inode) 626ac27a0ecSDave Kleikamp { 627617ba13bSMingming Cao struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info; 628617ba13bSMingming Cao #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 629617ba13bSMingming Cao if (EXT4_I(inode)->i_acl && 630617ba13bSMingming Cao EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) { 631617ba13bSMingming Cao posix_acl_release(EXT4_I(inode)->i_acl); 632617ba13bSMingming Cao EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED; 633ac27a0ecSDave Kleikamp } 634617ba13bSMingming Cao if (EXT4_I(inode)->i_default_acl && 635617ba13bSMingming Cao EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) { 636617ba13bSMingming Cao posix_acl_release(EXT4_I(inode)->i_default_acl); 637617ba13bSMingming Cao EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED; 638ac27a0ecSDave Kleikamp } 639ac27a0ecSDave Kleikamp #endif 640617ba13bSMingming Cao ext4_discard_reservation(inode); 641617ba13bSMingming Cao EXT4_I(inode)->i_block_alloc_info = NULL; 642ac27a0ecSDave Kleikamp if (unlikely(rsv)) 643ac27a0ecSDave Kleikamp kfree(rsv); 644678aaf48SJan Kara jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal, 645678aaf48SJan Kara &EXT4_I(inode)->jinode); 646ac27a0ecSDave Kleikamp } 647ac27a0ecSDave Kleikamp 648*2b2d6d01STheodore Ts'o static inline void ext4_show_quota_options(struct seq_file *seq, 649*2b2d6d01STheodore Ts'o struct super_block *sb) 650ac27a0ecSDave Kleikamp { 651ac27a0ecSDave Kleikamp #if defined(CONFIG_QUOTA) 652617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 653ac27a0ecSDave Kleikamp 654ac27a0ecSDave Kleikamp if (sbi->s_jquota_fmt) 655ac27a0ecSDave Kleikamp seq_printf(seq, ",jqfmt=%s", 656ac27a0ecSDave Kleikamp (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0"); 657ac27a0ecSDave Kleikamp 658ac27a0ecSDave Kleikamp if (sbi->s_qf_names[USRQUOTA]) 659ac27a0ecSDave Kleikamp seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); 660ac27a0ecSDave Kleikamp 661ac27a0ecSDave Kleikamp if (sbi->s_qf_names[GRPQUOTA]) 662ac27a0ecSDave Kleikamp seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); 663ac27a0ecSDave Kleikamp 664617ba13bSMingming Cao if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) 665ac27a0ecSDave Kleikamp seq_puts(seq, ",usrquota"); 666ac27a0ecSDave Kleikamp 667617ba13bSMingming Cao if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) 668ac27a0ecSDave Kleikamp seq_puts(seq, ",grpquota"); 669ac27a0ecSDave Kleikamp #endif 670ac27a0ecSDave Kleikamp } 671ac27a0ecSDave Kleikamp 672d9c9bef1SMiklos Szeredi /* 673d9c9bef1SMiklos Szeredi * Show an option if 674d9c9bef1SMiklos Szeredi * - it's set to a non-default value OR 675d9c9bef1SMiklos Szeredi * - if the per-sb default is different from the global default 676d9c9bef1SMiklos Szeredi */ 677617ba13bSMingming Cao static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs) 678ac27a0ecSDave Kleikamp { 679aa22df2cSAneesh Kumar K.V int def_errors; 680aa22df2cSAneesh Kumar K.V unsigned long def_mount_opts; 681ac27a0ecSDave Kleikamp struct super_block *sb = vfs->mnt_sb; 682d9c9bef1SMiklos Szeredi struct ext4_sb_info *sbi = EXT4_SB(sb); 683d9c9bef1SMiklos Szeredi struct ext4_super_block *es = sbi->s_es; 684d9c9bef1SMiklos Szeredi 685d9c9bef1SMiklos Szeredi def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 686aa22df2cSAneesh Kumar K.V def_errors = le16_to_cpu(es->s_errors); 687d9c9bef1SMiklos Szeredi 688d9c9bef1SMiklos Szeredi if (sbi->s_sb_block != 1) 689d9c9bef1SMiklos Szeredi seq_printf(seq, ",sb=%llu", sbi->s_sb_block); 690d9c9bef1SMiklos Szeredi if (test_opt(sb, MINIX_DF)) 691d9c9bef1SMiklos Szeredi seq_puts(seq, ",minixdf"); 692aa22df2cSAneesh Kumar K.V if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS)) 693d9c9bef1SMiklos Szeredi seq_puts(seq, ",grpid"); 694d9c9bef1SMiklos Szeredi if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS)) 695d9c9bef1SMiklos Szeredi seq_puts(seq, ",nogrpid"); 696d9c9bef1SMiklos Szeredi if (sbi->s_resuid != EXT4_DEF_RESUID || 697d9c9bef1SMiklos Szeredi le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) { 698d9c9bef1SMiklos Szeredi seq_printf(seq, ",resuid=%u", sbi->s_resuid); 699d9c9bef1SMiklos Szeredi } 700d9c9bef1SMiklos Szeredi if (sbi->s_resgid != EXT4_DEF_RESGID || 701d9c9bef1SMiklos Szeredi le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) { 702d9c9bef1SMiklos Szeredi seq_printf(seq, ",resgid=%u", sbi->s_resgid); 703d9c9bef1SMiklos Szeredi } 704bb4f397aSAneesh Kumar K.V if (test_opt(sb, ERRORS_RO)) { 705d9c9bef1SMiklos Szeredi if (def_errors == EXT4_ERRORS_PANIC || 706bb4f397aSAneesh Kumar K.V def_errors == EXT4_ERRORS_CONTINUE) { 707d9c9bef1SMiklos Szeredi seq_puts(seq, ",errors=remount-ro"); 708bb4f397aSAneesh Kumar K.V } 709bb4f397aSAneesh Kumar K.V } 710aa22df2cSAneesh Kumar K.V if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) 711bb4f397aSAneesh Kumar K.V seq_puts(seq, ",errors=continue"); 712aa22df2cSAneesh Kumar K.V if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) 713d9c9bef1SMiklos Szeredi seq_puts(seq, ",errors=panic"); 714aa22df2cSAneesh Kumar K.V if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16)) 715d9c9bef1SMiklos Szeredi seq_puts(seq, ",nouid32"); 716aa22df2cSAneesh Kumar K.V if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG)) 717d9c9bef1SMiklos Szeredi seq_puts(seq, ",debug"); 718d9c9bef1SMiklos Szeredi if (test_opt(sb, OLDALLOC)) 719d9c9bef1SMiklos Szeredi seq_puts(seq, ",oldalloc"); 72007620f69SAdrian Bunk #ifdef CONFIG_EXT4DEV_FS_XATTR 721aa22df2cSAneesh Kumar K.V if (test_opt(sb, XATTR_USER) && 722aa22df2cSAneesh Kumar K.V !(def_mount_opts & EXT4_DEFM_XATTR_USER)) 723d9c9bef1SMiklos Szeredi seq_puts(seq, ",user_xattr"); 724d9c9bef1SMiklos Szeredi if (!test_opt(sb, XATTR_USER) && 725d9c9bef1SMiklos Szeredi (def_mount_opts & EXT4_DEFM_XATTR_USER)) { 726d9c9bef1SMiklos Szeredi seq_puts(seq, ",nouser_xattr"); 727d9c9bef1SMiklos Szeredi } 728d9c9bef1SMiklos Szeredi #endif 72907620f69SAdrian Bunk #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 730aa22df2cSAneesh Kumar K.V if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL)) 731d9c9bef1SMiklos Szeredi seq_puts(seq, ",acl"); 732d9c9bef1SMiklos Szeredi if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL)) 733d9c9bef1SMiklos Szeredi seq_puts(seq, ",noacl"); 734d9c9bef1SMiklos Szeredi #endif 735d9c9bef1SMiklos Szeredi if (!test_opt(sb, RESERVATION)) 736d9c9bef1SMiklos Szeredi seq_puts(seq, ",noreservation"); 737d9c9bef1SMiklos Szeredi if (sbi->s_commit_interval) { 738d9c9bef1SMiklos Szeredi seq_printf(seq, ",commit=%u", 739d9c9bef1SMiklos Szeredi (unsigned) (sbi->s_commit_interval / HZ)); 740d9c9bef1SMiklos Szeredi } 741571640caSEric Sandeen /* 742571640caSEric Sandeen * We're changing the default of barrier mount option, so 743571640caSEric Sandeen * let's always display its mount state so it's clear what its 744571640caSEric Sandeen * status is. 745571640caSEric Sandeen */ 746571640caSEric Sandeen seq_puts(seq, ",barrier="); 747571640caSEric Sandeen seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0"); 748cd0b6a39STheodore Ts'o if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) 749cd0b6a39STheodore Ts'o seq_puts(seq, ",journal_async_commit"); 750d9c9bef1SMiklos Szeredi if (test_opt(sb, NOBH)) 751d9c9bef1SMiklos Szeredi seq_puts(seq, ",nobh"); 752d9c9bef1SMiklos Szeredi if (!test_opt(sb, EXTENTS)) 753d9c9bef1SMiklos Szeredi seq_puts(seq, ",noextents"); 7543dbd0edeSAneesh Kumar K.V if (!test_opt(sb, MBALLOC)) 7553dbd0edeSAneesh Kumar K.V seq_puts(seq, ",nomballoc"); 75625ec56b5SJean Noel Cordenner if (test_opt(sb, I_VERSION)) 75725ec56b5SJean Noel Cordenner seq_puts(seq, ",i_version"); 758dd919b98SAneesh Kumar K.V if (!test_opt(sb, DELALLOC)) 759dd919b98SAneesh Kumar K.V seq_puts(seq, ",nodelalloc"); 760dd919b98SAneesh Kumar K.V 761ac27a0ecSDave Kleikamp 762cb45bbe4SMiklos Szeredi if (sbi->s_stripe) 763cb45bbe4SMiklos Szeredi seq_printf(seq, ",stripe=%lu", sbi->s_stripe); 764aa22df2cSAneesh Kumar K.V /* 765aa22df2cSAneesh Kumar K.V * journal mode get enabled in different ways 766aa22df2cSAneesh Kumar K.V * So just print the value even if we didn't specify it 767aa22df2cSAneesh Kumar K.V */ 768617ba13bSMingming Cao if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 769ac27a0ecSDave Kleikamp seq_puts(seq, ",data=journal"); 770617ba13bSMingming Cao else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 771ac27a0ecSDave Kleikamp seq_puts(seq, ",data=ordered"); 772617ba13bSMingming Cao else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) 773ac27a0ecSDave Kleikamp seq_puts(seq, ",data=writeback"); 774ac27a0ecSDave Kleikamp 775617ba13bSMingming Cao ext4_show_quota_options(seq, sb); 776ac27a0ecSDave Kleikamp return 0; 777ac27a0ecSDave Kleikamp } 778ac27a0ecSDave Kleikamp 779ac27a0ecSDave Kleikamp 7801b961ac0SChristoph Hellwig static struct inode *ext4_nfs_get_inode(struct super_block *sb, 7811b961ac0SChristoph Hellwig u64 ino, u32 generation) 782ac27a0ecSDave Kleikamp { 783ac27a0ecSDave Kleikamp struct inode *inode; 784ac27a0ecSDave Kleikamp 785617ba13bSMingming Cao if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) 786ac27a0ecSDave Kleikamp return ERR_PTR(-ESTALE); 787617ba13bSMingming Cao if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) 788ac27a0ecSDave Kleikamp return ERR_PTR(-ESTALE); 789ac27a0ecSDave Kleikamp 790ac27a0ecSDave Kleikamp /* iget isn't really right if the inode is currently unallocated!! 791ac27a0ecSDave Kleikamp * 792617ba13bSMingming Cao * ext4_read_inode will return a bad_inode if the inode had been 793ac27a0ecSDave Kleikamp * deleted, so we should be safe. 794ac27a0ecSDave Kleikamp * 795ac27a0ecSDave Kleikamp * Currently we don't know the generation for parent directory, so 796ac27a0ecSDave Kleikamp * a generation of 0 means "accept any" 797ac27a0ecSDave Kleikamp */ 7981d1fe1eeSDavid Howells inode = ext4_iget(sb, ino); 7991d1fe1eeSDavid Howells if (IS_ERR(inode)) 8001d1fe1eeSDavid Howells return ERR_CAST(inode); 8011d1fe1eeSDavid Howells if (generation && inode->i_generation != generation) { 802ac27a0ecSDave Kleikamp iput(inode); 803ac27a0ecSDave Kleikamp return ERR_PTR(-ESTALE); 804ac27a0ecSDave Kleikamp } 8051b961ac0SChristoph Hellwig 8061b961ac0SChristoph Hellwig return inode; 807ac27a0ecSDave Kleikamp } 8081b961ac0SChristoph Hellwig 8091b961ac0SChristoph Hellwig static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, 8101b961ac0SChristoph Hellwig int fh_len, int fh_type) 8111b961ac0SChristoph Hellwig { 8121b961ac0SChristoph Hellwig return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 8131b961ac0SChristoph Hellwig ext4_nfs_get_inode); 8141b961ac0SChristoph Hellwig } 8151b961ac0SChristoph Hellwig 8161b961ac0SChristoph Hellwig static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, 8171b961ac0SChristoph Hellwig int fh_len, int fh_type) 8181b961ac0SChristoph Hellwig { 8191b961ac0SChristoph Hellwig return generic_fh_to_parent(sb, fid, fh_len, fh_type, 8201b961ac0SChristoph Hellwig ext4_nfs_get_inode); 821ac27a0ecSDave Kleikamp } 822ac27a0ecSDave Kleikamp 823ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 824ac27a0ecSDave Kleikamp #define QTYPE2NAME(t) ((t) == USRQUOTA?"user":"group") 825ac27a0ecSDave Kleikamp #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) 826ac27a0ecSDave Kleikamp 827617ba13bSMingming Cao static int ext4_dquot_initialize(struct inode *inode, int type); 828617ba13bSMingming Cao static int ext4_dquot_drop(struct inode *inode); 829617ba13bSMingming Cao static int ext4_write_dquot(struct dquot *dquot); 830617ba13bSMingming Cao static int ext4_acquire_dquot(struct dquot *dquot); 831617ba13bSMingming Cao static int ext4_release_dquot(struct dquot *dquot); 832617ba13bSMingming Cao static int ext4_mark_dquot_dirty(struct dquot *dquot); 833617ba13bSMingming Cao static int ext4_write_info(struct super_block *sb, int type); 8346f28e087SJan Kara static int ext4_quota_on(struct super_block *sb, int type, int format_id, 8356f28e087SJan Kara char *path, int remount); 836617ba13bSMingming Cao static int ext4_quota_on_mount(struct super_block *sb, int type); 837617ba13bSMingming Cao static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 838ac27a0ecSDave Kleikamp size_t len, loff_t off); 839617ba13bSMingming Cao static ssize_t ext4_quota_write(struct super_block *sb, int type, 840ac27a0ecSDave Kleikamp const char *data, size_t len, loff_t off); 841ac27a0ecSDave Kleikamp 842617ba13bSMingming Cao static struct dquot_operations ext4_quota_operations = { 843617ba13bSMingming Cao .initialize = ext4_dquot_initialize, 844617ba13bSMingming Cao .drop = ext4_dquot_drop, 845ac27a0ecSDave Kleikamp .alloc_space = dquot_alloc_space, 846ac27a0ecSDave Kleikamp .alloc_inode = dquot_alloc_inode, 847ac27a0ecSDave Kleikamp .free_space = dquot_free_space, 848ac27a0ecSDave Kleikamp .free_inode = dquot_free_inode, 849ac27a0ecSDave Kleikamp .transfer = dquot_transfer, 850617ba13bSMingming Cao .write_dquot = ext4_write_dquot, 851617ba13bSMingming Cao .acquire_dquot = ext4_acquire_dquot, 852617ba13bSMingming Cao .release_dquot = ext4_release_dquot, 853617ba13bSMingming Cao .mark_dirty = ext4_mark_dquot_dirty, 854617ba13bSMingming Cao .write_info = ext4_write_info 855ac27a0ecSDave Kleikamp }; 856ac27a0ecSDave Kleikamp 857617ba13bSMingming Cao static struct quotactl_ops ext4_qctl_operations = { 858617ba13bSMingming Cao .quota_on = ext4_quota_on, 859ac27a0ecSDave Kleikamp .quota_off = vfs_quota_off, 860ac27a0ecSDave Kleikamp .quota_sync = vfs_quota_sync, 861ac27a0ecSDave Kleikamp .get_info = vfs_get_dqinfo, 862ac27a0ecSDave Kleikamp .set_info = vfs_set_dqinfo, 863ac27a0ecSDave Kleikamp .get_dqblk = vfs_get_dqblk, 864ac27a0ecSDave Kleikamp .set_dqblk = vfs_set_dqblk 865ac27a0ecSDave Kleikamp }; 866ac27a0ecSDave Kleikamp #endif 867ac27a0ecSDave Kleikamp 868ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations ext4_sops = { 869617ba13bSMingming Cao .alloc_inode = ext4_alloc_inode, 870617ba13bSMingming Cao .destroy_inode = ext4_destroy_inode, 871617ba13bSMingming Cao .write_inode = ext4_write_inode, 872617ba13bSMingming Cao .dirty_inode = ext4_dirty_inode, 873617ba13bSMingming Cao .delete_inode = ext4_delete_inode, 874617ba13bSMingming Cao .put_super = ext4_put_super, 875617ba13bSMingming Cao .write_super = ext4_write_super, 876617ba13bSMingming Cao .sync_fs = ext4_sync_fs, 877617ba13bSMingming Cao .write_super_lockfs = ext4_write_super_lockfs, 878617ba13bSMingming Cao .unlockfs = ext4_unlockfs, 879617ba13bSMingming Cao .statfs = ext4_statfs, 880617ba13bSMingming Cao .remount_fs = ext4_remount, 881617ba13bSMingming Cao .clear_inode = ext4_clear_inode, 882617ba13bSMingming Cao .show_options = ext4_show_options, 883ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 884617ba13bSMingming Cao .quota_read = ext4_quota_read, 885617ba13bSMingming Cao .quota_write = ext4_quota_write, 886ac27a0ecSDave Kleikamp #endif 887ac27a0ecSDave Kleikamp }; 888ac27a0ecSDave Kleikamp 88939655164SChristoph Hellwig static const struct export_operations ext4_export_ops = { 8901b961ac0SChristoph Hellwig .fh_to_dentry = ext4_fh_to_dentry, 8911b961ac0SChristoph Hellwig .fh_to_parent = ext4_fh_to_parent, 892617ba13bSMingming Cao .get_parent = ext4_get_parent, 893ac27a0ecSDave Kleikamp }; 894ac27a0ecSDave Kleikamp 895ac27a0ecSDave Kleikamp enum { 896ac27a0ecSDave Kleikamp Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 897ac27a0ecSDave Kleikamp Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, 898ac27a0ecSDave Kleikamp Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov, 899ac27a0ecSDave Kleikamp Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, 900ac27a0ecSDave Kleikamp Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh, 901ac27a0ecSDave Kleikamp Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev, 902818d276cSGirish Shilamkar Opt_journal_checksum, Opt_journal_async_commit, 903ac27a0ecSDave Kleikamp Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, 904ac27a0ecSDave Kleikamp Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, 905ac27a0ecSDave Kleikamp Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota, 906ac27a0ecSDave Kleikamp Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota, 90725ec56b5SJean Noel Cordenner Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version, 908dd919b98SAneesh Kumar K.V Opt_mballoc, Opt_nomballoc, Opt_stripe, Opt_delalloc, Opt_nodelalloc, 909ac27a0ecSDave Kleikamp }; 910ac27a0ecSDave Kleikamp 911ac27a0ecSDave Kleikamp static match_table_t tokens = { 912ac27a0ecSDave Kleikamp {Opt_bsd_df, "bsddf"}, 913ac27a0ecSDave Kleikamp {Opt_minix_df, "minixdf"}, 914ac27a0ecSDave Kleikamp {Opt_grpid, "grpid"}, 915ac27a0ecSDave Kleikamp {Opt_grpid, "bsdgroups"}, 916ac27a0ecSDave Kleikamp {Opt_nogrpid, "nogrpid"}, 917ac27a0ecSDave Kleikamp {Opt_nogrpid, "sysvgroups"}, 918ac27a0ecSDave Kleikamp {Opt_resgid, "resgid=%u"}, 919ac27a0ecSDave Kleikamp {Opt_resuid, "resuid=%u"}, 920ac27a0ecSDave Kleikamp {Opt_sb, "sb=%u"}, 921ac27a0ecSDave Kleikamp {Opt_err_cont, "errors=continue"}, 922ac27a0ecSDave Kleikamp {Opt_err_panic, "errors=panic"}, 923ac27a0ecSDave Kleikamp {Opt_err_ro, "errors=remount-ro"}, 924ac27a0ecSDave Kleikamp {Opt_nouid32, "nouid32"}, 925ac27a0ecSDave Kleikamp {Opt_nocheck, "nocheck"}, 926ac27a0ecSDave Kleikamp {Opt_nocheck, "check=none"}, 927ac27a0ecSDave Kleikamp {Opt_debug, "debug"}, 928ac27a0ecSDave Kleikamp {Opt_oldalloc, "oldalloc"}, 929ac27a0ecSDave Kleikamp {Opt_orlov, "orlov"}, 930ac27a0ecSDave Kleikamp {Opt_user_xattr, "user_xattr"}, 931ac27a0ecSDave Kleikamp {Opt_nouser_xattr, "nouser_xattr"}, 932ac27a0ecSDave Kleikamp {Opt_acl, "acl"}, 933ac27a0ecSDave Kleikamp {Opt_noacl, "noacl"}, 934ac27a0ecSDave Kleikamp {Opt_reservation, "reservation"}, 935ac27a0ecSDave Kleikamp {Opt_noreservation, "noreservation"}, 936ac27a0ecSDave Kleikamp {Opt_noload, "noload"}, 937ac27a0ecSDave Kleikamp {Opt_nobh, "nobh"}, 938ac27a0ecSDave Kleikamp {Opt_bh, "bh"}, 939ac27a0ecSDave Kleikamp {Opt_commit, "commit=%u"}, 940ac27a0ecSDave Kleikamp {Opt_journal_update, "journal=update"}, 941ac27a0ecSDave Kleikamp {Opt_journal_inum, "journal=%u"}, 942ac27a0ecSDave Kleikamp {Opt_journal_dev, "journal_dev=%u"}, 943818d276cSGirish Shilamkar {Opt_journal_checksum, "journal_checksum"}, 944818d276cSGirish Shilamkar {Opt_journal_async_commit, "journal_async_commit"}, 945ac27a0ecSDave Kleikamp {Opt_abort, "abort"}, 946ac27a0ecSDave Kleikamp {Opt_data_journal, "data=journal"}, 947ac27a0ecSDave Kleikamp {Opt_data_ordered, "data=ordered"}, 948ac27a0ecSDave Kleikamp {Opt_data_writeback, "data=writeback"}, 949ac27a0ecSDave Kleikamp {Opt_offusrjquota, "usrjquota="}, 950ac27a0ecSDave Kleikamp {Opt_usrjquota, "usrjquota=%s"}, 951ac27a0ecSDave Kleikamp {Opt_offgrpjquota, "grpjquota="}, 952ac27a0ecSDave Kleikamp {Opt_grpjquota, "grpjquota=%s"}, 953ac27a0ecSDave Kleikamp {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, 954ac27a0ecSDave Kleikamp {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, 955ac27a0ecSDave Kleikamp {Opt_grpquota, "grpquota"}, 956ac27a0ecSDave Kleikamp {Opt_noquota, "noquota"}, 957ac27a0ecSDave Kleikamp {Opt_quota, "quota"}, 958ac27a0ecSDave Kleikamp {Opt_usrquota, "usrquota"}, 959ac27a0ecSDave Kleikamp {Opt_barrier, "barrier=%u"}, 960a86c6181SAlex Tomas {Opt_extents, "extents"}, 9611e2462f9SMingming Cao {Opt_noextents, "noextents"}, 96225ec56b5SJean Noel Cordenner {Opt_i_version, "i_version"}, 963c9de560dSAlex Tomas {Opt_mballoc, "mballoc"}, 964c9de560dSAlex Tomas {Opt_nomballoc, "nomballoc"}, 965c9de560dSAlex Tomas {Opt_stripe, "stripe=%u"}, 966ac27a0ecSDave Kleikamp {Opt_resize, "resize"}, 96764769240SAlex Tomas {Opt_delalloc, "delalloc"}, 968dd919b98SAneesh Kumar K.V {Opt_nodelalloc, "nodelalloc"}, 969f3f12faaSJosef Bacik {Opt_err, NULL}, 970ac27a0ecSDave Kleikamp }; 971ac27a0ecSDave Kleikamp 972617ba13bSMingming Cao static ext4_fsblk_t get_sb_block(void **data) 973ac27a0ecSDave Kleikamp { 974617ba13bSMingming Cao ext4_fsblk_t sb_block; 975ac27a0ecSDave Kleikamp char *options = (char *) *data; 976ac27a0ecSDave Kleikamp 977ac27a0ecSDave Kleikamp if (!options || strncmp(options, "sb=", 3) != 0) 978ac27a0ecSDave Kleikamp return 1; /* Default location */ 979ac27a0ecSDave Kleikamp options += 3; 980617ba13bSMingming Cao /*todo: use simple_strtoll with >32bit ext4 */ 981ac27a0ecSDave Kleikamp sb_block = simple_strtoul(options, &options, 0); 982ac27a0ecSDave Kleikamp if (*options && *options != ',') { 983617ba13bSMingming Cao printk("EXT4-fs: Invalid sb specification: %s\n", 984ac27a0ecSDave Kleikamp (char *) *data); 985ac27a0ecSDave Kleikamp return 1; 986ac27a0ecSDave Kleikamp } 987ac27a0ecSDave Kleikamp if (*options == ',') 988ac27a0ecSDave Kleikamp options++; 989ac27a0ecSDave Kleikamp *data = (void *) options; 990ac27a0ecSDave Kleikamp return sb_block; 991ac27a0ecSDave Kleikamp } 992ac27a0ecSDave Kleikamp 993ac27a0ecSDave Kleikamp static int parse_options(char *options, struct super_block *sb, 994ac27a0ecSDave Kleikamp unsigned int *inum, unsigned long *journal_devnum, 995617ba13bSMingming Cao ext4_fsblk_t *n_blocks_count, int is_remount) 996ac27a0ecSDave Kleikamp { 997617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 998ac27a0ecSDave Kleikamp char *p; 999ac27a0ecSDave Kleikamp substring_t args[MAX_OPT_ARGS]; 1000ac27a0ecSDave Kleikamp int data_opt = 0; 1001ac27a0ecSDave Kleikamp int option; 1002ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1003dfc5d03fSJan Kara int qtype, qfmt; 1004ac27a0ecSDave Kleikamp char *qname; 1005ac27a0ecSDave Kleikamp #endif 1006c07651b5SAneesh Kumar K.V ext4_fsblk_t last_block; 1007ac27a0ecSDave Kleikamp 1008ac27a0ecSDave Kleikamp if (!options) 1009ac27a0ecSDave Kleikamp return 1; 1010ac27a0ecSDave Kleikamp 1011ac27a0ecSDave Kleikamp while ((p = strsep(&options, ",")) != NULL) { 1012ac27a0ecSDave Kleikamp int token; 1013ac27a0ecSDave Kleikamp if (!*p) 1014ac27a0ecSDave Kleikamp continue; 1015ac27a0ecSDave Kleikamp 1016ac27a0ecSDave Kleikamp token = match_token(p, tokens, args); 1017ac27a0ecSDave Kleikamp switch (token) { 1018ac27a0ecSDave Kleikamp case Opt_bsd_df: 1019ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, MINIX_DF); 1020ac27a0ecSDave Kleikamp break; 1021ac27a0ecSDave Kleikamp case Opt_minix_df: 1022ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, MINIX_DF); 1023ac27a0ecSDave Kleikamp break; 1024ac27a0ecSDave Kleikamp case Opt_grpid: 1025ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, GRPID); 1026ac27a0ecSDave Kleikamp break; 1027ac27a0ecSDave Kleikamp case Opt_nogrpid: 1028ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, GRPID); 1029ac27a0ecSDave Kleikamp break; 1030ac27a0ecSDave Kleikamp case Opt_resuid: 1031ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 1032ac27a0ecSDave Kleikamp return 0; 1033ac27a0ecSDave Kleikamp sbi->s_resuid = option; 1034ac27a0ecSDave Kleikamp break; 1035ac27a0ecSDave Kleikamp case Opt_resgid: 1036ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 1037ac27a0ecSDave Kleikamp return 0; 1038ac27a0ecSDave Kleikamp sbi->s_resgid = option; 1039ac27a0ecSDave Kleikamp break; 1040ac27a0ecSDave Kleikamp case Opt_sb: 1041ac27a0ecSDave Kleikamp /* handled by get_sb_block() instead of here */ 1042ac27a0ecSDave Kleikamp /* *sb_block = match_int(&args[0]); */ 1043ac27a0ecSDave Kleikamp break; 1044ac27a0ecSDave Kleikamp case Opt_err_panic: 1045ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, ERRORS_CONT); 1046ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, ERRORS_RO); 1047ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, ERRORS_PANIC); 1048ac27a0ecSDave Kleikamp break; 1049ac27a0ecSDave Kleikamp case Opt_err_ro: 1050ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, ERRORS_CONT); 1051ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, ERRORS_PANIC); 1052ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, ERRORS_RO); 1053ac27a0ecSDave Kleikamp break; 1054ac27a0ecSDave Kleikamp case Opt_err_cont: 1055ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, ERRORS_RO); 1056ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, ERRORS_PANIC); 1057ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, ERRORS_CONT); 1058ac27a0ecSDave Kleikamp break; 1059ac27a0ecSDave Kleikamp case Opt_nouid32: 1060ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, NO_UID32); 1061ac27a0ecSDave Kleikamp break; 1062ac27a0ecSDave Kleikamp case Opt_nocheck: 1063ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, CHECK); 1064ac27a0ecSDave Kleikamp break; 1065ac27a0ecSDave Kleikamp case Opt_debug: 1066ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, DEBUG); 1067ac27a0ecSDave Kleikamp break; 1068ac27a0ecSDave Kleikamp case Opt_oldalloc: 1069ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, OLDALLOC); 1070ac27a0ecSDave Kleikamp break; 1071ac27a0ecSDave Kleikamp case Opt_orlov: 1072ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, OLDALLOC); 1073ac27a0ecSDave Kleikamp break; 1074617ba13bSMingming Cao #ifdef CONFIG_EXT4DEV_FS_XATTR 1075ac27a0ecSDave Kleikamp case Opt_user_xattr: 1076ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, XATTR_USER); 1077ac27a0ecSDave Kleikamp break; 1078ac27a0ecSDave Kleikamp case Opt_nouser_xattr: 1079ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, XATTR_USER); 1080ac27a0ecSDave Kleikamp break; 1081ac27a0ecSDave Kleikamp #else 1082ac27a0ecSDave Kleikamp case Opt_user_xattr: 1083ac27a0ecSDave Kleikamp case Opt_nouser_xattr: 1084617ba13bSMingming Cao printk("EXT4 (no)user_xattr options not supported\n"); 1085ac27a0ecSDave Kleikamp break; 1086ac27a0ecSDave Kleikamp #endif 1087617ba13bSMingming Cao #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 1088ac27a0ecSDave Kleikamp case Opt_acl: 1089ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, POSIX_ACL); 1090ac27a0ecSDave Kleikamp break; 1091ac27a0ecSDave Kleikamp case Opt_noacl: 1092ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, POSIX_ACL); 1093ac27a0ecSDave Kleikamp break; 1094ac27a0ecSDave Kleikamp #else 1095ac27a0ecSDave Kleikamp case Opt_acl: 1096ac27a0ecSDave Kleikamp case Opt_noacl: 1097617ba13bSMingming Cao printk("EXT4 (no)acl options not supported\n"); 1098ac27a0ecSDave Kleikamp break; 1099ac27a0ecSDave Kleikamp #endif 1100ac27a0ecSDave Kleikamp case Opt_reservation: 1101ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, RESERVATION); 1102ac27a0ecSDave Kleikamp break; 1103ac27a0ecSDave Kleikamp case Opt_noreservation: 1104ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, RESERVATION); 1105ac27a0ecSDave Kleikamp break; 1106ac27a0ecSDave Kleikamp case Opt_journal_update: 1107ac27a0ecSDave Kleikamp /* @@@ FIXME */ 1108ac27a0ecSDave Kleikamp /* Eventually we will want to be able to create 1109ac27a0ecSDave Kleikamp a journal file here. For now, only allow the 1110ac27a0ecSDave Kleikamp user to specify an existing inode to be the 1111ac27a0ecSDave Kleikamp journal file. */ 1112ac27a0ecSDave Kleikamp if (is_remount) { 1113617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: cannot specify " 1114ac27a0ecSDave Kleikamp "journal on remount\n"); 1115ac27a0ecSDave Kleikamp return 0; 1116ac27a0ecSDave Kleikamp } 1117ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, UPDATE_JOURNAL); 1118ac27a0ecSDave Kleikamp break; 1119ac27a0ecSDave Kleikamp case Opt_journal_inum: 1120ac27a0ecSDave Kleikamp if (is_remount) { 1121617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: cannot specify " 1122ac27a0ecSDave Kleikamp "journal on remount\n"); 1123ac27a0ecSDave Kleikamp return 0; 1124ac27a0ecSDave Kleikamp } 1125ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 1126ac27a0ecSDave Kleikamp return 0; 1127ac27a0ecSDave Kleikamp *inum = option; 1128ac27a0ecSDave Kleikamp break; 1129ac27a0ecSDave Kleikamp case Opt_journal_dev: 1130ac27a0ecSDave Kleikamp if (is_remount) { 1131617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: cannot specify " 1132ac27a0ecSDave Kleikamp "journal on remount\n"); 1133ac27a0ecSDave Kleikamp return 0; 1134ac27a0ecSDave Kleikamp } 1135ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 1136ac27a0ecSDave Kleikamp return 0; 1137ac27a0ecSDave Kleikamp *journal_devnum = option; 1138ac27a0ecSDave Kleikamp break; 1139818d276cSGirish Shilamkar case Opt_journal_checksum: 1140818d276cSGirish Shilamkar set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); 1141818d276cSGirish Shilamkar break; 1142818d276cSGirish Shilamkar case Opt_journal_async_commit: 1143818d276cSGirish Shilamkar set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT); 1144818d276cSGirish Shilamkar set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); 1145818d276cSGirish Shilamkar break; 1146ac27a0ecSDave Kleikamp case Opt_noload: 1147ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, NOLOAD); 1148ac27a0ecSDave Kleikamp break; 1149ac27a0ecSDave Kleikamp case Opt_commit: 1150ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 1151ac27a0ecSDave Kleikamp return 0; 1152ac27a0ecSDave Kleikamp if (option < 0) 1153ac27a0ecSDave Kleikamp return 0; 1154ac27a0ecSDave Kleikamp if (option == 0) 1155cd02ff0bSMingming Cao option = JBD2_DEFAULT_MAX_COMMIT_AGE; 1156ac27a0ecSDave Kleikamp sbi->s_commit_interval = HZ * option; 1157ac27a0ecSDave Kleikamp break; 1158ac27a0ecSDave Kleikamp case Opt_data_journal: 1159617ba13bSMingming Cao data_opt = EXT4_MOUNT_JOURNAL_DATA; 1160ac27a0ecSDave Kleikamp goto datacheck; 1161ac27a0ecSDave Kleikamp case Opt_data_ordered: 1162617ba13bSMingming Cao data_opt = EXT4_MOUNT_ORDERED_DATA; 1163ac27a0ecSDave Kleikamp goto datacheck; 1164ac27a0ecSDave Kleikamp case Opt_data_writeback: 1165617ba13bSMingming Cao data_opt = EXT4_MOUNT_WRITEBACK_DATA; 1166ac27a0ecSDave Kleikamp datacheck: 1167ac27a0ecSDave Kleikamp if (is_remount) { 1168617ba13bSMingming Cao if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS) 1169ac27a0ecSDave Kleikamp != data_opt) { 1170ac27a0ecSDave Kleikamp printk(KERN_ERR 1171617ba13bSMingming Cao "EXT4-fs: cannot change data " 1172ac27a0ecSDave Kleikamp "mode on remount\n"); 1173ac27a0ecSDave Kleikamp return 0; 1174ac27a0ecSDave Kleikamp } 1175ac27a0ecSDave Kleikamp } else { 1176617ba13bSMingming Cao sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS; 1177ac27a0ecSDave Kleikamp sbi->s_mount_opt |= data_opt; 1178ac27a0ecSDave Kleikamp } 1179ac27a0ecSDave Kleikamp break; 1180ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1181ac27a0ecSDave Kleikamp case Opt_usrjquota: 1182ac27a0ecSDave Kleikamp qtype = USRQUOTA; 1183ac27a0ecSDave Kleikamp goto set_qf_name; 1184ac27a0ecSDave Kleikamp case Opt_grpjquota: 1185ac27a0ecSDave Kleikamp qtype = GRPQUOTA; 1186ac27a0ecSDave Kleikamp set_qf_name: 1187dfc5d03fSJan Kara if ((sb_any_quota_enabled(sb) || 1188dfc5d03fSJan Kara sb_any_quota_suspended(sb)) && 1189dfc5d03fSJan Kara !sbi->s_qf_names[qtype]) { 1190ac27a0ecSDave Kleikamp printk(KERN_ERR 11912c8be6b2SJan Kara "EXT4-fs: Cannot change journaled " 1192ac27a0ecSDave Kleikamp "quota options when quota turned on.\n"); 1193ac27a0ecSDave Kleikamp return 0; 1194ac27a0ecSDave Kleikamp } 1195ac27a0ecSDave Kleikamp qname = match_strdup(&args[0]); 1196ac27a0ecSDave Kleikamp if (!qname) { 1197ac27a0ecSDave Kleikamp printk(KERN_ERR 1198617ba13bSMingming Cao "EXT4-fs: not enough memory for " 1199ac27a0ecSDave Kleikamp "storing quotafile name.\n"); 1200ac27a0ecSDave Kleikamp return 0; 1201ac27a0ecSDave Kleikamp } 1202ac27a0ecSDave Kleikamp if (sbi->s_qf_names[qtype] && 1203ac27a0ecSDave Kleikamp strcmp(sbi->s_qf_names[qtype], qname)) { 1204ac27a0ecSDave Kleikamp printk(KERN_ERR 1205617ba13bSMingming Cao "EXT4-fs: %s quota file already " 1206ac27a0ecSDave Kleikamp "specified.\n", QTYPE2NAME(qtype)); 1207ac27a0ecSDave Kleikamp kfree(qname); 1208ac27a0ecSDave Kleikamp return 0; 1209ac27a0ecSDave Kleikamp } 1210ac27a0ecSDave Kleikamp sbi->s_qf_names[qtype] = qname; 1211ac27a0ecSDave Kleikamp if (strchr(sbi->s_qf_names[qtype], '/')) { 1212ac27a0ecSDave Kleikamp printk(KERN_ERR 1213617ba13bSMingming Cao "EXT4-fs: quotafile must be on " 1214ac27a0ecSDave Kleikamp "filesystem root.\n"); 1215ac27a0ecSDave Kleikamp kfree(sbi->s_qf_names[qtype]); 1216ac27a0ecSDave Kleikamp sbi->s_qf_names[qtype] = NULL; 1217ac27a0ecSDave Kleikamp return 0; 1218ac27a0ecSDave Kleikamp } 1219ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, QUOTA); 1220ac27a0ecSDave Kleikamp break; 1221ac27a0ecSDave Kleikamp case Opt_offusrjquota: 1222ac27a0ecSDave Kleikamp qtype = USRQUOTA; 1223ac27a0ecSDave Kleikamp goto clear_qf_name; 1224ac27a0ecSDave Kleikamp case Opt_offgrpjquota: 1225ac27a0ecSDave Kleikamp qtype = GRPQUOTA; 1226ac27a0ecSDave Kleikamp clear_qf_name: 1227dfc5d03fSJan Kara if ((sb_any_quota_enabled(sb) || 1228dfc5d03fSJan Kara sb_any_quota_suspended(sb)) && 1229dfc5d03fSJan Kara sbi->s_qf_names[qtype]) { 1230617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: Cannot change " 12312c8be6b2SJan Kara "journaled quota options when " 1232ac27a0ecSDave Kleikamp "quota turned on.\n"); 1233ac27a0ecSDave Kleikamp return 0; 1234ac27a0ecSDave Kleikamp } 1235ac27a0ecSDave Kleikamp /* 1236ac27a0ecSDave Kleikamp * The space will be released later when all options 1237ac27a0ecSDave Kleikamp * are confirmed to be correct 1238ac27a0ecSDave Kleikamp */ 1239ac27a0ecSDave Kleikamp sbi->s_qf_names[qtype] = NULL; 1240ac27a0ecSDave Kleikamp break; 1241ac27a0ecSDave Kleikamp case Opt_jqfmt_vfsold: 1242dfc5d03fSJan Kara qfmt = QFMT_VFS_OLD; 1243dfc5d03fSJan Kara goto set_qf_format; 1244ac27a0ecSDave Kleikamp case Opt_jqfmt_vfsv0: 1245dfc5d03fSJan Kara qfmt = QFMT_VFS_V0; 1246dfc5d03fSJan Kara set_qf_format: 1247dfc5d03fSJan Kara if ((sb_any_quota_enabled(sb) || 1248dfc5d03fSJan Kara sb_any_quota_suspended(sb)) && 1249dfc5d03fSJan Kara sbi->s_jquota_fmt != qfmt) { 1250dfc5d03fSJan Kara printk(KERN_ERR "EXT4-fs: Cannot change " 1251dfc5d03fSJan Kara "journaled quota options when " 1252dfc5d03fSJan Kara "quota turned on.\n"); 1253dfc5d03fSJan Kara return 0; 1254dfc5d03fSJan Kara } 1255dfc5d03fSJan Kara sbi->s_jquota_fmt = qfmt; 1256ac27a0ecSDave Kleikamp break; 1257ac27a0ecSDave Kleikamp case Opt_quota: 1258ac27a0ecSDave Kleikamp case Opt_usrquota: 1259ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, QUOTA); 1260ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, USRQUOTA); 1261ac27a0ecSDave Kleikamp break; 1262ac27a0ecSDave Kleikamp case Opt_grpquota: 1263ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, QUOTA); 1264ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, GRPQUOTA); 1265ac27a0ecSDave Kleikamp break; 1266ac27a0ecSDave Kleikamp case Opt_noquota: 1267ac27a0ecSDave Kleikamp if (sb_any_quota_enabled(sb)) { 1268617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: Cannot change quota " 1269ac27a0ecSDave Kleikamp "options when quota turned on.\n"); 1270ac27a0ecSDave Kleikamp return 0; 1271ac27a0ecSDave Kleikamp } 1272ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, QUOTA); 1273ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, USRQUOTA); 1274ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, GRPQUOTA); 1275ac27a0ecSDave Kleikamp break; 1276ac27a0ecSDave Kleikamp #else 1277ac27a0ecSDave Kleikamp case Opt_quota: 1278ac27a0ecSDave Kleikamp case Opt_usrquota: 1279ac27a0ecSDave Kleikamp case Opt_grpquota: 1280cd59e7b9SJan Kara printk(KERN_ERR 1281cd59e7b9SJan Kara "EXT4-fs: quota options not supported.\n"); 1282cd59e7b9SJan Kara break; 1283ac27a0ecSDave Kleikamp case Opt_usrjquota: 1284ac27a0ecSDave Kleikamp case Opt_grpjquota: 1285ac27a0ecSDave Kleikamp case Opt_offusrjquota: 1286ac27a0ecSDave Kleikamp case Opt_offgrpjquota: 1287ac27a0ecSDave Kleikamp case Opt_jqfmt_vfsold: 1288ac27a0ecSDave Kleikamp case Opt_jqfmt_vfsv0: 1289ac27a0ecSDave Kleikamp printk(KERN_ERR 1290cd59e7b9SJan Kara "EXT4-fs: journaled quota options not " 1291ac27a0ecSDave Kleikamp "supported.\n"); 1292ac27a0ecSDave Kleikamp break; 1293ac27a0ecSDave Kleikamp case Opt_noquota: 1294ac27a0ecSDave Kleikamp break; 1295ac27a0ecSDave Kleikamp #endif 1296ac27a0ecSDave Kleikamp case Opt_abort: 1297ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, ABORT); 1298ac27a0ecSDave Kleikamp break; 1299ac27a0ecSDave Kleikamp case Opt_barrier: 1300ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 1301ac27a0ecSDave Kleikamp return 0; 1302ac27a0ecSDave Kleikamp if (option) 1303ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, BARRIER); 1304ac27a0ecSDave Kleikamp else 1305ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, BARRIER); 1306ac27a0ecSDave Kleikamp break; 1307ac27a0ecSDave Kleikamp case Opt_ignore: 1308ac27a0ecSDave Kleikamp break; 1309ac27a0ecSDave Kleikamp case Opt_resize: 1310ac27a0ecSDave Kleikamp if (!is_remount) { 1311617ba13bSMingming Cao printk("EXT4-fs: resize option only available " 1312ac27a0ecSDave Kleikamp "for remount\n"); 1313ac27a0ecSDave Kleikamp return 0; 1314ac27a0ecSDave Kleikamp } 1315ac27a0ecSDave Kleikamp if (match_int(&args[0], &option) != 0) 1316ac27a0ecSDave Kleikamp return 0; 1317ac27a0ecSDave Kleikamp *n_blocks_count = option; 1318ac27a0ecSDave Kleikamp break; 1319ac27a0ecSDave Kleikamp case Opt_nobh: 1320ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, NOBH); 1321ac27a0ecSDave Kleikamp break; 1322ac27a0ecSDave Kleikamp case Opt_bh: 1323ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, NOBH); 1324ac27a0ecSDave Kleikamp break; 1325a86c6181SAlex Tomas case Opt_extents: 1326e4079a11SEric Sandeen if (!EXT4_HAS_INCOMPAT_FEATURE(sb, 1327e4079a11SEric Sandeen EXT4_FEATURE_INCOMPAT_EXTENTS)) { 1328e4079a11SEric Sandeen ext4_warning(sb, __func__, 1329e4079a11SEric Sandeen "extents feature not enabled " 1330e4079a11SEric Sandeen "on this filesystem, use tune2fs\n"); 1331e4079a11SEric Sandeen return 0; 1332e4079a11SEric Sandeen } 1333a86c6181SAlex Tomas set_opt(sbi->s_mount_opt, EXTENTS); 1334a86c6181SAlex Tomas break; 13351e2462f9SMingming Cao case Opt_noextents: 1336c07651b5SAneesh Kumar K.V /* 1337c07651b5SAneesh Kumar K.V * When e2fsprogs support resizing an already existing 1338c07651b5SAneesh Kumar K.V * ext3 file system to greater than 2**32 we need to 1339c07651b5SAneesh Kumar K.V * add support to block allocator to handle growing 1340c07651b5SAneesh Kumar K.V * already existing block mapped inode so that blocks 1341c07651b5SAneesh Kumar K.V * allocated for them fall within 2**32 1342c07651b5SAneesh Kumar K.V */ 1343c07651b5SAneesh Kumar K.V last_block = ext4_blocks_count(sbi->s_es) - 1; 1344c07651b5SAneesh Kumar K.V if (last_block > 0xffffffffULL) { 1345c07651b5SAneesh Kumar K.V printk(KERN_ERR "EXT4-fs: Filesystem too " 1346c07651b5SAneesh Kumar K.V "large to mount with " 1347c07651b5SAneesh Kumar K.V "-o noextents options\n"); 1348c07651b5SAneesh Kumar K.V return 0; 1349c07651b5SAneesh Kumar K.V } 13501e2462f9SMingming Cao clear_opt(sbi->s_mount_opt, EXTENTS); 13511e2462f9SMingming Cao break; 135225ec56b5SJean Noel Cordenner case Opt_i_version: 135325ec56b5SJean Noel Cordenner set_opt(sbi->s_mount_opt, I_VERSION); 135425ec56b5SJean Noel Cordenner sb->s_flags |= MS_I_VERSION; 135525ec56b5SJean Noel Cordenner break; 1356dd919b98SAneesh Kumar K.V case Opt_nodelalloc: 1357dd919b98SAneesh Kumar K.V clear_opt(sbi->s_mount_opt, DELALLOC); 1358dd919b98SAneesh Kumar K.V break; 1359c9de560dSAlex Tomas case Opt_mballoc: 1360c9de560dSAlex Tomas set_opt(sbi->s_mount_opt, MBALLOC); 1361c9de560dSAlex Tomas break; 1362c9de560dSAlex Tomas case Opt_nomballoc: 1363c9de560dSAlex Tomas clear_opt(sbi->s_mount_opt, MBALLOC); 1364c9de560dSAlex Tomas break; 1365c9de560dSAlex Tomas case Opt_stripe: 1366c9de560dSAlex Tomas if (match_int(&args[0], &option)) 1367c9de560dSAlex Tomas return 0; 1368c9de560dSAlex Tomas if (option < 0) 1369c9de560dSAlex Tomas return 0; 1370c9de560dSAlex Tomas sbi->s_stripe = option; 1371c9de560dSAlex Tomas break; 137264769240SAlex Tomas case Opt_delalloc: 137364769240SAlex Tomas set_opt(sbi->s_mount_opt, DELALLOC); 137464769240SAlex Tomas break; 1375ac27a0ecSDave Kleikamp default: 1376ac27a0ecSDave Kleikamp printk(KERN_ERR 1377617ba13bSMingming Cao "EXT4-fs: Unrecognized mount option \"%s\" " 1378ac27a0ecSDave Kleikamp "or missing value\n", p); 1379ac27a0ecSDave Kleikamp return 0; 1380ac27a0ecSDave Kleikamp } 1381ac27a0ecSDave Kleikamp } 1382ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1383ac27a0ecSDave Kleikamp if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { 1384617ba13bSMingming Cao if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) && 1385ac27a0ecSDave Kleikamp sbi->s_qf_names[USRQUOTA]) 1386ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, USRQUOTA); 1387ac27a0ecSDave Kleikamp 1388617ba13bSMingming Cao if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) && 1389ac27a0ecSDave Kleikamp sbi->s_qf_names[GRPQUOTA]) 1390ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, GRPQUOTA); 1391ac27a0ecSDave Kleikamp 1392ac27a0ecSDave Kleikamp if ((sbi->s_qf_names[USRQUOTA] && 1393617ba13bSMingming Cao (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) || 1394ac27a0ecSDave Kleikamp (sbi->s_qf_names[GRPQUOTA] && 1395617ba13bSMingming Cao (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) { 1396617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: old and new quota " 1397ac27a0ecSDave Kleikamp "format mixing.\n"); 1398ac27a0ecSDave Kleikamp return 0; 1399ac27a0ecSDave Kleikamp } 1400ac27a0ecSDave Kleikamp 1401ac27a0ecSDave Kleikamp if (!sbi->s_jquota_fmt) { 14022c8be6b2SJan Kara printk(KERN_ERR "EXT4-fs: journaled quota format " 1403ac27a0ecSDave Kleikamp "not specified.\n"); 1404ac27a0ecSDave Kleikamp return 0; 1405ac27a0ecSDave Kleikamp } 1406ac27a0ecSDave Kleikamp } else { 1407ac27a0ecSDave Kleikamp if (sbi->s_jquota_fmt) { 14082c8be6b2SJan Kara printk(KERN_ERR "EXT4-fs: journaled quota format " 14092c8be6b2SJan Kara "specified with no journaling " 1410ac27a0ecSDave Kleikamp "enabled.\n"); 1411ac27a0ecSDave Kleikamp return 0; 1412ac27a0ecSDave Kleikamp } 1413ac27a0ecSDave Kleikamp } 1414ac27a0ecSDave Kleikamp #endif 1415ac27a0ecSDave Kleikamp return 1; 1416ac27a0ecSDave Kleikamp } 1417ac27a0ecSDave Kleikamp 1418617ba13bSMingming Cao static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, 1419ac27a0ecSDave Kleikamp int read_only) 1420ac27a0ecSDave Kleikamp { 1421617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 1422ac27a0ecSDave Kleikamp int res = 0; 1423ac27a0ecSDave Kleikamp 1424617ba13bSMingming Cao if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { 1425617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs warning: revision level too high, " 1426ac27a0ecSDave Kleikamp "forcing read-only mode\n"); 1427ac27a0ecSDave Kleikamp res = MS_RDONLY; 1428ac27a0ecSDave Kleikamp } 1429ac27a0ecSDave Kleikamp if (read_only) 1430ac27a0ecSDave Kleikamp return res; 1431617ba13bSMingming Cao if (!(sbi->s_mount_state & EXT4_VALID_FS)) 1432617ba13bSMingming Cao printk(KERN_WARNING "EXT4-fs warning: mounting unchecked fs, " 1433ac27a0ecSDave Kleikamp "running e2fsck is recommended\n"); 1434617ba13bSMingming Cao else if ((sbi->s_mount_state & EXT4_ERROR_FS)) 1435ac27a0ecSDave Kleikamp printk(KERN_WARNING 1436617ba13bSMingming Cao "EXT4-fs warning: mounting fs with errors, " 1437ac27a0ecSDave Kleikamp "running e2fsck is recommended\n"); 1438ac27a0ecSDave Kleikamp else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 1439ac27a0ecSDave Kleikamp le16_to_cpu(es->s_mnt_count) >= 1440ac27a0ecSDave Kleikamp (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 1441ac27a0ecSDave Kleikamp printk(KERN_WARNING 1442617ba13bSMingming Cao "EXT4-fs warning: maximal mount count reached, " 1443ac27a0ecSDave Kleikamp "running e2fsck is recommended\n"); 1444ac27a0ecSDave Kleikamp else if (le32_to_cpu(es->s_checkinterval) && 1445ac27a0ecSDave Kleikamp (le32_to_cpu(es->s_lastcheck) + 1446ac27a0ecSDave Kleikamp le32_to_cpu(es->s_checkinterval) <= get_seconds())) 1447ac27a0ecSDave Kleikamp printk(KERN_WARNING 1448617ba13bSMingming Cao "EXT4-fs warning: checktime reached, " 1449ac27a0ecSDave Kleikamp "running e2fsck is recommended\n"); 1450ac27a0ecSDave Kleikamp #if 0 1451ac27a0ecSDave Kleikamp /* @@@ We _will_ want to clear the valid bit if we find 145263f57933SAndrew Morton * inconsistencies, to force a fsck at reboot. But for 145363f57933SAndrew Morton * a plain journaled filesystem we can keep it set as 145463f57933SAndrew Morton * valid forever! :) 145563f57933SAndrew Morton */ 1456216c34b2SMarcin Slusarz es->s_state &= cpu_to_le16(~EXT4_VALID_FS); 1457ac27a0ecSDave Kleikamp #endif 1458ac27a0ecSDave Kleikamp if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) 1459617ba13bSMingming Cao es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); 1460e8546d06SMarcin Slusarz le16_add_cpu(&es->s_mnt_count, 1); 1461ac27a0ecSDave Kleikamp es->s_mtime = cpu_to_le32(get_seconds()); 1462617ba13bSMingming Cao ext4_update_dynamic_rev(sb); 1463617ba13bSMingming Cao EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 1464ac27a0ecSDave Kleikamp 1465617ba13bSMingming Cao ext4_commit_super(sb, es, 1); 1466ac27a0ecSDave Kleikamp if (test_opt(sb, DEBUG)) 1467617ba13bSMingming Cao printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, " 1468ac27a0ecSDave Kleikamp "bpg=%lu, ipg=%lu, mo=%04lx]\n", 1469ac27a0ecSDave Kleikamp sb->s_blocksize, 1470ac27a0ecSDave Kleikamp sbi->s_groups_count, 1471617ba13bSMingming Cao EXT4_BLOCKS_PER_GROUP(sb), 1472617ba13bSMingming Cao EXT4_INODES_PER_GROUP(sb), 1473ac27a0ecSDave Kleikamp sbi->s_mount_opt); 1474ac27a0ecSDave Kleikamp 1475617ba13bSMingming Cao printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id); 1476617ba13bSMingming Cao if (EXT4_SB(sb)->s_journal->j_inode == NULL) { 1477ac27a0ecSDave Kleikamp char b[BDEVNAME_SIZE]; 1478ac27a0ecSDave Kleikamp 1479ac27a0ecSDave Kleikamp printk("external journal on %s\n", 1480617ba13bSMingming Cao bdevname(EXT4_SB(sb)->s_journal->j_dev, b)); 1481ac27a0ecSDave Kleikamp } else { 1482ac27a0ecSDave Kleikamp printk("internal journal\n"); 1483ac27a0ecSDave Kleikamp } 1484ac27a0ecSDave Kleikamp return res; 1485ac27a0ecSDave Kleikamp } 1486ac27a0ecSDave Kleikamp 1487772cb7c8SJose R. Santos static int ext4_fill_flex_info(struct super_block *sb) 1488772cb7c8SJose R. Santos { 1489772cb7c8SJose R. Santos struct ext4_sb_info *sbi = EXT4_SB(sb); 1490772cb7c8SJose R. Santos struct ext4_group_desc *gdp = NULL; 1491772cb7c8SJose R. Santos struct buffer_head *bh; 1492772cb7c8SJose R. Santos ext4_group_t flex_group_count; 1493772cb7c8SJose R. Santos ext4_group_t flex_group; 1494772cb7c8SJose R. Santos int groups_per_flex = 0; 1495772cb7c8SJose R. Santos __u64 block_bitmap = 0; 1496772cb7c8SJose R. Santos int i; 1497772cb7c8SJose R. Santos 1498772cb7c8SJose R. Santos if (!sbi->s_es->s_log_groups_per_flex) { 1499772cb7c8SJose R. Santos sbi->s_log_groups_per_flex = 0; 1500772cb7c8SJose R. Santos return 1; 1501772cb7c8SJose R. Santos } 1502772cb7c8SJose R. Santos 1503772cb7c8SJose R. Santos sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex; 1504772cb7c8SJose R. Santos groups_per_flex = 1 << sbi->s_log_groups_per_flex; 1505772cb7c8SJose R. Santos 1506772cb7c8SJose R. Santos flex_group_count = (sbi->s_groups_count + groups_per_flex - 1) / 1507772cb7c8SJose R. Santos groups_per_flex; 1508ec05e868SLi Zefan sbi->s_flex_groups = kzalloc(flex_group_count * 1509772cb7c8SJose R. Santos sizeof(struct flex_groups), GFP_KERNEL); 1510772cb7c8SJose R. Santos if (sbi->s_flex_groups == NULL) { 1511ec05e868SLi Zefan printk(KERN_ERR "EXT4-fs: not enough memory for " 1512ec05e868SLi Zefan "%lu flex groups\n", flex_group_count); 1513772cb7c8SJose R. Santos goto failed; 1514772cb7c8SJose R. Santos } 1515772cb7c8SJose R. Santos 1516772cb7c8SJose R. Santos gdp = ext4_get_group_desc(sb, 1, &bh); 1517772cb7c8SJose R. Santos block_bitmap = ext4_block_bitmap(sb, gdp) - 1; 1518772cb7c8SJose R. Santos 1519772cb7c8SJose R. Santos for (i = 0; i < sbi->s_groups_count; i++) { 1520772cb7c8SJose R. Santos gdp = ext4_get_group_desc(sb, i, &bh); 1521772cb7c8SJose R. Santos 1522772cb7c8SJose R. Santos flex_group = ext4_flex_group(sbi, i); 1523772cb7c8SJose R. Santos sbi->s_flex_groups[flex_group].free_inodes += 1524772cb7c8SJose R. Santos le16_to_cpu(gdp->bg_free_inodes_count); 1525772cb7c8SJose R. Santos sbi->s_flex_groups[flex_group].free_blocks += 1526772cb7c8SJose R. Santos le16_to_cpu(gdp->bg_free_blocks_count); 1527772cb7c8SJose R. Santos } 1528772cb7c8SJose R. Santos 1529772cb7c8SJose R. Santos return 1; 1530772cb7c8SJose R. Santos failed: 1531772cb7c8SJose R. Santos return 0; 1532772cb7c8SJose R. Santos } 1533772cb7c8SJose R. Santos 1534717d50e4SAndreas Dilger __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group, 1535717d50e4SAndreas Dilger struct ext4_group_desc *gdp) 1536717d50e4SAndreas Dilger { 1537717d50e4SAndreas Dilger __u16 crc = 0; 1538717d50e4SAndreas Dilger 1539717d50e4SAndreas Dilger if (sbi->s_es->s_feature_ro_compat & 1540717d50e4SAndreas Dilger cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { 1541717d50e4SAndreas Dilger int offset = offsetof(struct ext4_group_desc, bg_checksum); 1542717d50e4SAndreas Dilger __le32 le_group = cpu_to_le32(block_group); 1543717d50e4SAndreas Dilger 1544717d50e4SAndreas Dilger crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); 1545717d50e4SAndreas Dilger crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); 1546717d50e4SAndreas Dilger crc = crc16(crc, (__u8 *)gdp, offset); 1547717d50e4SAndreas Dilger offset += sizeof(gdp->bg_checksum); /* skip checksum */ 1548717d50e4SAndreas Dilger /* for checksum of struct ext4_group_desc do the rest...*/ 1549717d50e4SAndreas Dilger if ((sbi->s_es->s_feature_incompat & 1550717d50e4SAndreas Dilger cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) && 1551717d50e4SAndreas Dilger offset < le16_to_cpu(sbi->s_es->s_desc_size)) 1552717d50e4SAndreas Dilger crc = crc16(crc, (__u8 *)gdp + offset, 1553717d50e4SAndreas Dilger le16_to_cpu(sbi->s_es->s_desc_size) - 1554717d50e4SAndreas Dilger offset); 1555717d50e4SAndreas Dilger } 1556717d50e4SAndreas Dilger 1557717d50e4SAndreas Dilger return cpu_to_le16(crc); 1558717d50e4SAndreas Dilger } 1559717d50e4SAndreas Dilger 1560717d50e4SAndreas Dilger int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group, 1561717d50e4SAndreas Dilger struct ext4_group_desc *gdp) 1562717d50e4SAndreas Dilger { 1563717d50e4SAndreas Dilger if ((sbi->s_es->s_feature_ro_compat & 1564717d50e4SAndreas Dilger cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) && 1565717d50e4SAndreas Dilger (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp))) 1566717d50e4SAndreas Dilger return 0; 1567717d50e4SAndreas Dilger 1568717d50e4SAndreas Dilger return 1; 1569717d50e4SAndreas Dilger } 1570717d50e4SAndreas Dilger 1571ac27a0ecSDave Kleikamp /* Called at mount-time, super-block is locked */ 1572617ba13bSMingming Cao static int ext4_check_descriptors(struct super_block *sb) 1573ac27a0ecSDave Kleikamp { 1574617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 1575617ba13bSMingming Cao ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); 1576617ba13bSMingming Cao ext4_fsblk_t last_block; 1577bd81d8eeSLaurent Vivier ext4_fsblk_t block_bitmap; 1578bd81d8eeSLaurent Vivier ext4_fsblk_t inode_bitmap; 1579bd81d8eeSLaurent Vivier ext4_fsblk_t inode_table; 1580ce421581SJose R. Santos int flexbg_flag = 0; 1581fd2d4291SAvantika Mathur ext4_group_t i; 1582ac27a0ecSDave Kleikamp 1583ce421581SJose R. Santos if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 1584ce421581SJose R. Santos flexbg_flag = 1; 1585ce421581SJose R. Santos 1586617ba13bSMingming Cao ext4_debug ("Checking group descriptors"); 1587ac27a0ecSDave Kleikamp 1588197cd65aSAkinobu Mita for (i = 0; i < sbi->s_groups_count; i++) { 1589197cd65aSAkinobu Mita struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); 1590197cd65aSAkinobu Mita 1591ce421581SJose R. Santos if (i == sbi->s_groups_count - 1 || flexbg_flag) 1592bd81d8eeSLaurent Vivier last_block = ext4_blocks_count(sbi->s_es) - 1; 1593ac27a0ecSDave Kleikamp else 1594ac27a0ecSDave Kleikamp last_block = first_block + 1595617ba13bSMingming Cao (EXT4_BLOCKS_PER_GROUP(sb) - 1); 1596ac27a0ecSDave Kleikamp 15978fadc143SAlexandre Ratchov block_bitmap = ext4_block_bitmap(sb, gdp); 1598*2b2d6d01STheodore Ts'o if (block_bitmap < first_block || block_bitmap > last_block) { 1599c19204b0SJosef Bacik printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " 1600c19204b0SJosef Bacik "Block bitmap for group %lu not in group " 1601c19204b0SJosef Bacik "(block %llu)!", i, block_bitmap); 1602ac27a0ecSDave Kleikamp return 0; 1603ac27a0ecSDave Kleikamp } 16048fadc143SAlexandre Ratchov inode_bitmap = ext4_inode_bitmap(sb, gdp); 1605*2b2d6d01STheodore Ts'o if (inode_bitmap < first_block || inode_bitmap > last_block) { 1606c19204b0SJosef Bacik printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " 1607c19204b0SJosef Bacik "Inode bitmap for group %lu not in group " 1608c19204b0SJosef Bacik "(block %llu)!", i, inode_bitmap); 1609ac27a0ecSDave Kleikamp return 0; 1610ac27a0ecSDave Kleikamp } 16118fadc143SAlexandre Ratchov inode_table = ext4_inode_table(sb, gdp); 1612bd81d8eeSLaurent Vivier if (inode_table < first_block || 1613*2b2d6d01STheodore Ts'o inode_table + sbi->s_itb_per_group - 1 > last_block) { 1614c19204b0SJosef Bacik printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " 1615c19204b0SJosef Bacik "Inode table for group %lu not in group " 1616c19204b0SJosef Bacik "(block %llu)!", i, inode_table); 1617ac27a0ecSDave Kleikamp return 0; 1618ac27a0ecSDave Kleikamp } 1619b5f10eedSEric Sandeen spin_lock(sb_bgl_lock(sbi, i)); 1620717d50e4SAndreas Dilger if (!ext4_group_desc_csum_verify(sbi, i, gdp)) { 1621c19204b0SJosef Bacik printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " 1622fd2d4291SAvantika Mathur "Checksum for group %lu failed (%u!=%u)\n", 1623fd2d4291SAvantika Mathur i, le16_to_cpu(ext4_group_desc_csum(sbi, i, 1624fd2d4291SAvantika Mathur gdp)), le16_to_cpu(gdp->bg_checksum)); 16258a266467STheodore Ts'o if (!(sb->s_flags & MS_RDONLY)) 1626717d50e4SAndreas Dilger return 0; 1627717d50e4SAndreas Dilger } 1628b5f10eedSEric Sandeen spin_unlock(sb_bgl_lock(sbi, i)); 1629ce421581SJose R. Santos if (!flexbg_flag) 1630617ba13bSMingming Cao first_block += EXT4_BLOCKS_PER_GROUP(sb); 1631ac27a0ecSDave Kleikamp } 1632ac27a0ecSDave Kleikamp 1633bd81d8eeSLaurent Vivier ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb)); 1634617ba13bSMingming Cao sbi->s_es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb)); 1635ac27a0ecSDave Kleikamp return 1; 1636ac27a0ecSDave Kleikamp } 1637ac27a0ecSDave Kleikamp 1638617ba13bSMingming Cao /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at 1639ac27a0ecSDave Kleikamp * the superblock) which were deleted from all directories, but held open by 1640ac27a0ecSDave Kleikamp * a process at the time of a crash. We walk the list and try to delete these 1641ac27a0ecSDave Kleikamp * inodes at recovery time (only with a read-write filesystem). 1642ac27a0ecSDave Kleikamp * 1643ac27a0ecSDave Kleikamp * In order to keep the orphan inode chain consistent during traversal (in 1644ac27a0ecSDave Kleikamp * case of crash during recovery), we link each inode into the superblock 1645ac27a0ecSDave Kleikamp * orphan list_head and handle it the same way as an inode deletion during 1646ac27a0ecSDave Kleikamp * normal operation (which journals the operations for us). 1647ac27a0ecSDave Kleikamp * 1648ac27a0ecSDave Kleikamp * We only do an iget() and an iput() on each inode, which is very safe if we 1649ac27a0ecSDave Kleikamp * accidentally point at an in-use or already deleted inode. The worst that 1650ac27a0ecSDave Kleikamp * can happen in this case is that we get a "bit already cleared" message from 1651617ba13bSMingming Cao * ext4_free_inode(). The only reason we would point at a wrong inode is if 1652ac27a0ecSDave Kleikamp * e2fsck was run on this filesystem, and it must have already done the orphan 1653ac27a0ecSDave Kleikamp * inode cleanup for us, so we can safely abort without any further action. 1654ac27a0ecSDave Kleikamp */ 1655617ba13bSMingming Cao static void ext4_orphan_cleanup(struct super_block *sb, 1656617ba13bSMingming Cao struct ext4_super_block *es) 1657ac27a0ecSDave Kleikamp { 1658ac27a0ecSDave Kleikamp unsigned int s_flags = sb->s_flags; 1659ac27a0ecSDave Kleikamp int nr_orphans = 0, nr_truncates = 0; 1660ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1661ac27a0ecSDave Kleikamp int i; 1662ac27a0ecSDave Kleikamp #endif 1663ac27a0ecSDave Kleikamp if (!es->s_last_orphan) { 1664ac27a0ecSDave Kleikamp jbd_debug(4, "no orphan inodes to clean up\n"); 1665ac27a0ecSDave Kleikamp return; 1666ac27a0ecSDave Kleikamp } 1667ac27a0ecSDave Kleikamp 1668a8f48a95SEric Sandeen if (bdev_read_only(sb->s_bdev)) { 1669a8f48a95SEric Sandeen printk(KERN_ERR "EXT4-fs: write access " 1670a8f48a95SEric Sandeen "unavailable, skipping orphan cleanup.\n"); 1671a8f48a95SEric Sandeen return; 1672a8f48a95SEric Sandeen } 1673a8f48a95SEric Sandeen 1674617ba13bSMingming Cao if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { 1675ac27a0ecSDave Kleikamp if (es->s_last_orphan) 1676ac27a0ecSDave Kleikamp jbd_debug(1, "Errors on filesystem, " 1677ac27a0ecSDave Kleikamp "clearing orphan list.\n"); 1678ac27a0ecSDave Kleikamp es->s_last_orphan = 0; 1679ac27a0ecSDave Kleikamp jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); 1680ac27a0ecSDave Kleikamp return; 1681ac27a0ecSDave Kleikamp } 1682ac27a0ecSDave Kleikamp 1683ac27a0ecSDave Kleikamp if (s_flags & MS_RDONLY) { 1684617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n", 1685ac27a0ecSDave Kleikamp sb->s_id); 1686ac27a0ecSDave Kleikamp sb->s_flags &= ~MS_RDONLY; 1687ac27a0ecSDave Kleikamp } 1688ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1689ac27a0ecSDave Kleikamp /* Needed for iput() to work correctly and not trash data */ 1690ac27a0ecSDave Kleikamp sb->s_flags |= MS_ACTIVE; 1691ac27a0ecSDave Kleikamp /* Turn on quotas so that they are updated correctly */ 1692ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) { 1693617ba13bSMingming Cao if (EXT4_SB(sb)->s_qf_names[i]) { 1694617ba13bSMingming Cao int ret = ext4_quota_on_mount(sb, i); 1695ac27a0ecSDave Kleikamp if (ret < 0) 1696ac27a0ecSDave Kleikamp printk(KERN_ERR 16972c8be6b2SJan Kara "EXT4-fs: Cannot turn on journaled " 1698ac27a0ecSDave Kleikamp "quota: error %d\n", ret); 1699ac27a0ecSDave Kleikamp } 1700ac27a0ecSDave Kleikamp } 1701ac27a0ecSDave Kleikamp #endif 1702ac27a0ecSDave Kleikamp 1703ac27a0ecSDave Kleikamp while (es->s_last_orphan) { 1704ac27a0ecSDave Kleikamp struct inode *inode; 1705ac27a0ecSDave Kleikamp 170697bd42b9SJosef Bacik inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); 170797bd42b9SJosef Bacik if (IS_ERR(inode)) { 1708ac27a0ecSDave Kleikamp es->s_last_orphan = 0; 1709ac27a0ecSDave Kleikamp break; 1710ac27a0ecSDave Kleikamp } 1711ac27a0ecSDave Kleikamp 1712617ba13bSMingming Cao list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); 1713ac27a0ecSDave Kleikamp DQUOT_INIT(inode); 1714ac27a0ecSDave Kleikamp if (inode->i_nlink) { 1715ac27a0ecSDave Kleikamp printk(KERN_DEBUG 1716ac27a0ecSDave Kleikamp "%s: truncating inode %lu to %Ld bytes\n", 171746e665e9SHarvey Harrison __func__, inode->i_ino, inode->i_size); 1718ac27a0ecSDave Kleikamp jbd_debug(2, "truncating inode %lu to %Ld bytes\n", 1719ac27a0ecSDave Kleikamp inode->i_ino, inode->i_size); 1720617ba13bSMingming Cao ext4_truncate(inode); 1721ac27a0ecSDave Kleikamp nr_truncates++; 1722ac27a0ecSDave Kleikamp } else { 1723ac27a0ecSDave Kleikamp printk(KERN_DEBUG 1724ac27a0ecSDave Kleikamp "%s: deleting unreferenced inode %lu\n", 172546e665e9SHarvey Harrison __func__, inode->i_ino); 1726ac27a0ecSDave Kleikamp jbd_debug(2, "deleting unreferenced inode %lu\n", 1727ac27a0ecSDave Kleikamp inode->i_ino); 1728ac27a0ecSDave Kleikamp nr_orphans++; 1729ac27a0ecSDave Kleikamp } 1730ac27a0ecSDave Kleikamp iput(inode); /* The delete magic happens here! */ 1731ac27a0ecSDave Kleikamp } 1732ac27a0ecSDave Kleikamp 1733ac27a0ecSDave Kleikamp #define PLURAL(x) (x), ((x) == 1) ? "" : "s" 1734ac27a0ecSDave Kleikamp 1735ac27a0ecSDave Kleikamp if (nr_orphans) 1736617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n", 1737ac27a0ecSDave Kleikamp sb->s_id, PLURAL(nr_orphans)); 1738ac27a0ecSDave Kleikamp if (nr_truncates) 1739617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n", 1740ac27a0ecSDave Kleikamp sb->s_id, PLURAL(nr_truncates)); 1741ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1742ac27a0ecSDave Kleikamp /* Turn quotas off */ 1743ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) { 1744ac27a0ecSDave Kleikamp if (sb_dqopt(sb)->files[i]) 17456f28e087SJan Kara vfs_quota_off(sb, i, 0); 1746ac27a0ecSDave Kleikamp } 1747ac27a0ecSDave Kleikamp #endif 1748ac27a0ecSDave Kleikamp sb->s_flags = s_flags; /* Restore MS_RDONLY status */ 1749ac27a0ecSDave Kleikamp } 1750cd2291a4SEric Sandeen /* 1751cd2291a4SEric Sandeen * Maximal extent format file size. 1752cd2291a4SEric Sandeen * Resulting logical blkno at s_maxbytes must fit in our on-disk 1753cd2291a4SEric Sandeen * extent format containers, within a sector_t, and within i_blocks 1754cd2291a4SEric Sandeen * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, 1755cd2291a4SEric Sandeen * so that won't be a limiting factor. 1756cd2291a4SEric Sandeen * 1757cd2291a4SEric Sandeen * Note, this does *not* consider any metadata overhead for vfs i_blocks. 1758cd2291a4SEric Sandeen */ 1759cd2291a4SEric Sandeen static loff_t ext4_max_size(int blkbits) 1760cd2291a4SEric Sandeen { 1761cd2291a4SEric Sandeen loff_t res; 1762cd2291a4SEric Sandeen loff_t upper_limit = MAX_LFS_FILESIZE; 1763cd2291a4SEric Sandeen 1764cd2291a4SEric Sandeen /* small i_blocks in vfs inode? */ 1765cd2291a4SEric Sandeen if (sizeof(blkcnt_t) < sizeof(u64)) { 1766cd2291a4SEric Sandeen /* 1767cd2291a4SEric Sandeen * CONFIG_LSF is not enabled implies the inode 1768cd2291a4SEric Sandeen * i_block represent total blocks in 512 bytes 1769cd2291a4SEric Sandeen * 32 == size of vfs inode i_blocks * 8 1770cd2291a4SEric Sandeen */ 1771cd2291a4SEric Sandeen upper_limit = (1LL << 32) - 1; 1772cd2291a4SEric Sandeen 1773cd2291a4SEric Sandeen /* total blocks in file system block size */ 1774cd2291a4SEric Sandeen upper_limit >>= (blkbits - 9); 1775cd2291a4SEric Sandeen upper_limit <<= blkbits; 1776cd2291a4SEric Sandeen } 1777cd2291a4SEric Sandeen 1778cd2291a4SEric Sandeen /* 32-bit extent-start container, ee_block */ 1779cd2291a4SEric Sandeen res = 1LL << 32; 1780cd2291a4SEric Sandeen res <<= blkbits; 1781cd2291a4SEric Sandeen res -= 1; 1782cd2291a4SEric Sandeen 1783cd2291a4SEric Sandeen /* Sanity check against vm- & vfs- imposed limits */ 1784cd2291a4SEric Sandeen if (res > upper_limit) 1785cd2291a4SEric Sandeen res = upper_limit; 1786cd2291a4SEric Sandeen 1787cd2291a4SEric Sandeen return res; 1788cd2291a4SEric Sandeen } 1789ac27a0ecSDave Kleikamp 1790ac27a0ecSDave Kleikamp /* 1791cd2291a4SEric Sandeen * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect 17920fc1b451SAneesh Kumar K.V * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. 17930fc1b451SAneesh Kumar K.V * We need to be 1 filesystem block less than the 2^48 sector limit. 1794ac27a0ecSDave Kleikamp */ 1795cd2291a4SEric Sandeen static loff_t ext4_max_bitmap_size(int bits) 1796ac27a0ecSDave Kleikamp { 1797617ba13bSMingming Cao loff_t res = EXT4_NDIR_BLOCKS; 17980fc1b451SAneesh Kumar K.V int meta_blocks; 17990fc1b451SAneesh Kumar K.V loff_t upper_limit; 18000fc1b451SAneesh Kumar K.V /* This is calculated to be the largest file size for a 1801cd2291a4SEric Sandeen * dense, bitmapped file such that the total number of 1802ac27a0ecSDave Kleikamp * sectors in the file, including data and all indirect blocks, 18030fc1b451SAneesh Kumar K.V * does not exceed 2^48 -1 18040fc1b451SAneesh Kumar K.V * __u32 i_blocks_lo and _u16 i_blocks_high representing the 18050fc1b451SAneesh Kumar K.V * total number of 512 bytes blocks of the file 18060fc1b451SAneesh Kumar K.V */ 18070fc1b451SAneesh Kumar K.V 18080fc1b451SAneesh Kumar K.V if (sizeof(blkcnt_t) < sizeof(u64)) { 18090fc1b451SAneesh Kumar K.V /* 18100fc1b451SAneesh Kumar K.V * CONFIG_LSF is not enabled implies the inode 18110fc1b451SAneesh Kumar K.V * i_block represent total blocks in 512 bytes 18120fc1b451SAneesh Kumar K.V * 32 == size of vfs inode i_blocks * 8 18130fc1b451SAneesh Kumar K.V */ 18140fc1b451SAneesh Kumar K.V upper_limit = (1LL << 32) - 1; 18150fc1b451SAneesh Kumar K.V 18160fc1b451SAneesh Kumar K.V /* total blocks in file system block size */ 18170fc1b451SAneesh Kumar K.V upper_limit >>= (bits - 9); 18180fc1b451SAneesh Kumar K.V 18190fc1b451SAneesh Kumar K.V } else { 18208180a562SAneesh Kumar K.V /* 18218180a562SAneesh Kumar K.V * We use 48 bit ext4_inode i_blocks 18228180a562SAneesh Kumar K.V * With EXT4_HUGE_FILE_FL set the i_blocks 18238180a562SAneesh Kumar K.V * represent total number of blocks in 18248180a562SAneesh Kumar K.V * file system block size 18258180a562SAneesh Kumar K.V */ 18260fc1b451SAneesh Kumar K.V upper_limit = (1LL << 48) - 1; 18270fc1b451SAneesh Kumar K.V 18280fc1b451SAneesh Kumar K.V } 18290fc1b451SAneesh Kumar K.V 18300fc1b451SAneesh Kumar K.V /* indirect blocks */ 18310fc1b451SAneesh Kumar K.V meta_blocks = 1; 18320fc1b451SAneesh Kumar K.V /* double indirect blocks */ 18330fc1b451SAneesh Kumar K.V meta_blocks += 1 + (1LL << (bits-2)); 18340fc1b451SAneesh Kumar K.V /* tripple indirect blocks */ 18350fc1b451SAneesh Kumar K.V meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); 18360fc1b451SAneesh Kumar K.V 18370fc1b451SAneesh Kumar K.V upper_limit -= meta_blocks; 18380fc1b451SAneesh Kumar K.V upper_limit <<= bits; 1839ac27a0ecSDave Kleikamp 1840ac27a0ecSDave Kleikamp res += 1LL << (bits-2); 1841ac27a0ecSDave Kleikamp res += 1LL << (2*(bits-2)); 1842ac27a0ecSDave Kleikamp res += 1LL << (3*(bits-2)); 1843ac27a0ecSDave Kleikamp res <<= bits; 1844ac27a0ecSDave Kleikamp if (res > upper_limit) 1845ac27a0ecSDave Kleikamp res = upper_limit; 18460fc1b451SAneesh Kumar K.V 18470fc1b451SAneesh Kumar K.V if (res > MAX_LFS_FILESIZE) 18480fc1b451SAneesh Kumar K.V res = MAX_LFS_FILESIZE; 18490fc1b451SAneesh Kumar K.V 1850ac27a0ecSDave Kleikamp return res; 1851ac27a0ecSDave Kleikamp } 1852ac27a0ecSDave Kleikamp 1853617ba13bSMingming Cao static ext4_fsblk_t descriptor_loc(struct super_block *sb, 185470bbb3e0SAndrew Morton ext4_fsblk_t logical_sb_block, int nr) 1855ac27a0ecSDave Kleikamp { 1856617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 1857fd2d4291SAvantika Mathur ext4_group_t bg, first_meta_bg; 1858ac27a0ecSDave Kleikamp int has_super = 0; 1859ac27a0ecSDave Kleikamp 1860ac27a0ecSDave Kleikamp first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 1861ac27a0ecSDave Kleikamp 1862617ba13bSMingming Cao if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || 1863ac27a0ecSDave Kleikamp nr < first_meta_bg) 186470bbb3e0SAndrew Morton return logical_sb_block + nr + 1; 1865ac27a0ecSDave Kleikamp bg = sbi->s_desc_per_block * nr; 1866617ba13bSMingming Cao if (ext4_bg_has_super(sb, bg)) 1867ac27a0ecSDave Kleikamp has_super = 1; 1868617ba13bSMingming Cao return (has_super + ext4_group_first_block_no(sb, bg)); 1869ac27a0ecSDave Kleikamp } 1870ac27a0ecSDave Kleikamp 1871c9de560dSAlex Tomas /** 1872c9de560dSAlex Tomas * ext4_get_stripe_size: Get the stripe size. 1873c9de560dSAlex Tomas * @sbi: In memory super block info 1874c9de560dSAlex Tomas * 1875c9de560dSAlex Tomas * If we have specified it via mount option, then 1876c9de560dSAlex Tomas * use the mount option value. If the value specified at mount time is 1877c9de560dSAlex Tomas * greater than the blocks per group use the super block value. 1878c9de560dSAlex Tomas * If the super block value is greater than blocks per group return 0. 1879c9de560dSAlex Tomas * Allocator needs it be less than blocks per group. 1880c9de560dSAlex Tomas * 1881c9de560dSAlex Tomas */ 1882c9de560dSAlex Tomas static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) 1883c9de560dSAlex Tomas { 1884c9de560dSAlex Tomas unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); 1885c9de560dSAlex Tomas unsigned long stripe_width = 1886c9de560dSAlex Tomas le32_to_cpu(sbi->s_es->s_raid_stripe_width); 1887c9de560dSAlex Tomas 1888c9de560dSAlex Tomas if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) 1889c9de560dSAlex Tomas return sbi->s_stripe; 1890c9de560dSAlex Tomas 1891c9de560dSAlex Tomas if (stripe_width <= sbi->s_blocks_per_group) 1892c9de560dSAlex Tomas return stripe_width; 1893c9de560dSAlex Tomas 1894c9de560dSAlex Tomas if (stride <= sbi->s_blocks_per_group) 1895c9de560dSAlex Tomas return stride; 1896c9de560dSAlex Tomas 1897c9de560dSAlex Tomas return 0; 1898c9de560dSAlex Tomas } 1899ac27a0ecSDave Kleikamp 1900617ba13bSMingming Cao static int ext4_fill_super(struct super_block *sb, void *data, int silent) 19017477827fSAneesh Kumar K.V __releases(kernel_lock) 19027477827fSAneesh Kumar K.V __acquires(kernel_lock) 19031d03ec98SAneesh Kumar K.V 1904ac27a0ecSDave Kleikamp { 1905ac27a0ecSDave Kleikamp struct buffer_head *bh; 1906617ba13bSMingming Cao struct ext4_super_block *es = NULL; 1907617ba13bSMingming Cao struct ext4_sb_info *sbi; 1908617ba13bSMingming Cao ext4_fsblk_t block; 1909617ba13bSMingming Cao ext4_fsblk_t sb_block = get_sb_block(&data); 191070bbb3e0SAndrew Morton ext4_fsblk_t logical_sb_block; 1911ac27a0ecSDave Kleikamp unsigned long offset = 0; 1912ac27a0ecSDave Kleikamp unsigned int journal_inum = 0; 1913ac27a0ecSDave Kleikamp unsigned long journal_devnum = 0; 1914ac27a0ecSDave Kleikamp unsigned long def_mount_opts; 1915ac27a0ecSDave Kleikamp struct inode *root; 19161d1fe1eeSDavid Howells int ret = -EINVAL; 1917ac27a0ecSDave Kleikamp int blocksize; 1918ac27a0ecSDave Kleikamp int db_count; 1919ac27a0ecSDave Kleikamp int i; 1920ac27a0ecSDave Kleikamp int needs_recovery; 1921ac27a0ecSDave Kleikamp __le32 features; 1922bd81d8eeSLaurent Vivier __u64 blocks_count; 1923833f4077SPeter Zijlstra int err; 1924ac27a0ecSDave Kleikamp 1925ac27a0ecSDave Kleikamp sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 1926ac27a0ecSDave Kleikamp if (!sbi) 1927ac27a0ecSDave Kleikamp return -ENOMEM; 1928ac27a0ecSDave Kleikamp sb->s_fs_info = sbi; 1929ac27a0ecSDave Kleikamp sbi->s_mount_opt = 0; 1930617ba13bSMingming Cao sbi->s_resuid = EXT4_DEF_RESUID; 1931617ba13bSMingming Cao sbi->s_resgid = EXT4_DEF_RESGID; 1932d9c9bef1SMiklos Szeredi sbi->s_sb_block = sb_block; 1933ac27a0ecSDave Kleikamp 1934ac27a0ecSDave Kleikamp unlock_kernel(); 1935ac27a0ecSDave Kleikamp 1936617ba13bSMingming Cao blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); 1937ac27a0ecSDave Kleikamp if (!blocksize) { 1938617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: unable to set blocksize\n"); 1939ac27a0ecSDave Kleikamp goto out_fail; 1940ac27a0ecSDave Kleikamp } 1941ac27a0ecSDave Kleikamp 1942ac27a0ecSDave Kleikamp /* 1943617ba13bSMingming Cao * The ext4 superblock will not be buffer aligned for other than 1kB 1944ac27a0ecSDave Kleikamp * block sizes. We need to calculate the offset from buffer start. 1945ac27a0ecSDave Kleikamp */ 1946617ba13bSMingming Cao if (blocksize != EXT4_MIN_BLOCK_SIZE) { 194770bbb3e0SAndrew Morton logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 194870bbb3e0SAndrew Morton offset = do_div(logical_sb_block, blocksize); 1949ac27a0ecSDave Kleikamp } else { 195070bbb3e0SAndrew Morton logical_sb_block = sb_block; 1951ac27a0ecSDave Kleikamp } 1952ac27a0ecSDave Kleikamp 195370bbb3e0SAndrew Morton if (!(bh = sb_bread(sb, logical_sb_block))) { 1954617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: unable to read superblock\n"); 1955ac27a0ecSDave Kleikamp goto out_fail; 1956ac27a0ecSDave Kleikamp } 1957ac27a0ecSDave Kleikamp /* 1958ac27a0ecSDave Kleikamp * Note: s_es must be initialized as soon as possible because 1959617ba13bSMingming Cao * some ext4 macro-instructions depend on its value 1960ac27a0ecSDave Kleikamp */ 1961617ba13bSMingming Cao es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 1962ac27a0ecSDave Kleikamp sbi->s_es = es; 1963ac27a0ecSDave Kleikamp sb->s_magic = le16_to_cpu(es->s_magic); 1964617ba13bSMingming Cao if (sb->s_magic != EXT4_SUPER_MAGIC) 1965617ba13bSMingming Cao goto cantfind_ext4; 1966ac27a0ecSDave Kleikamp 1967ac27a0ecSDave Kleikamp /* Set defaults before we parse the mount options */ 1968ac27a0ecSDave Kleikamp def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 1969617ba13bSMingming Cao if (def_mount_opts & EXT4_DEFM_DEBUG) 1970ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, DEBUG); 1971617ba13bSMingming Cao if (def_mount_opts & EXT4_DEFM_BSDGROUPS) 1972ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, GRPID); 1973617ba13bSMingming Cao if (def_mount_opts & EXT4_DEFM_UID16) 1974ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, NO_UID32); 19752e7842b8SHugh Dickins #ifdef CONFIG_EXT4DEV_FS_XATTR 1976617ba13bSMingming Cao if (def_mount_opts & EXT4_DEFM_XATTR_USER) 1977ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, XATTR_USER); 19782e7842b8SHugh Dickins #endif 19792e7842b8SHugh Dickins #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 1980617ba13bSMingming Cao if (def_mount_opts & EXT4_DEFM_ACL) 1981ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, POSIX_ACL); 19822e7842b8SHugh Dickins #endif 1983617ba13bSMingming Cao if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) 1984617ba13bSMingming Cao sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA; 1985617ba13bSMingming Cao else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) 1986617ba13bSMingming Cao sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA; 1987617ba13bSMingming Cao else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) 1988617ba13bSMingming Cao sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA; 1989ac27a0ecSDave Kleikamp 1990617ba13bSMingming Cao if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) 1991ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, ERRORS_PANIC); 1992bb4f397aSAneesh Kumar K.V else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE) 1993ceea16bfSDmitry Mishin set_opt(sbi->s_mount_opt, ERRORS_CONT); 1994bb4f397aSAneesh Kumar K.V else 1995bb4f397aSAneesh Kumar K.V set_opt(sbi->s_mount_opt, ERRORS_RO); 1996ac27a0ecSDave Kleikamp 1997ac27a0ecSDave Kleikamp sbi->s_resuid = le16_to_cpu(es->s_def_resuid); 1998ac27a0ecSDave Kleikamp sbi->s_resgid = le16_to_cpu(es->s_def_resgid); 1999ac27a0ecSDave Kleikamp 2000ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, RESERVATION); 2001571640caSEric Sandeen set_opt(sbi->s_mount_opt, BARRIER); 2002ac27a0ecSDave Kleikamp 20031e2462f9SMingming Cao /* 20041e2462f9SMingming Cao * turn on extents feature by default in ext4 filesystem 2005e4079a11SEric Sandeen * only if feature flag already set by mkfs or tune2fs. 2006e4079a11SEric Sandeen * Use -o noextents to turn it off 20071e2462f9SMingming Cao */ 2008e4079a11SEric Sandeen if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) 20091e2462f9SMingming Cao set_opt(sbi->s_mount_opt, EXTENTS); 2010e4079a11SEric Sandeen else 2011e4079a11SEric Sandeen ext4_warning(sb, __func__, 2012e4079a11SEric Sandeen "extents feature not enabled on this filesystem, " 2013e4079a11SEric Sandeen "use tune2fs.\n"); 20143dbd0edeSAneesh Kumar K.V /* 2015e4079a11SEric Sandeen * turn on mballoc code by default in ext4 filesystem 2016e4079a11SEric Sandeen * Use -o nomballoc to turn it off 20173dbd0edeSAneesh Kumar K.V */ 20183dbd0edeSAneesh Kumar K.V set_opt(sbi->s_mount_opt, MBALLOC); 20191e2462f9SMingming Cao 2020dd919b98SAneesh Kumar K.V /* 2021dd919b98SAneesh Kumar K.V * enable delayed allocation by default 2022dd919b98SAneesh Kumar K.V * Use -o nodelalloc to turn it off 2023dd919b98SAneesh Kumar K.V */ 2024dd919b98SAneesh Kumar K.V set_opt(sbi->s_mount_opt, DELALLOC); 2025dd919b98SAneesh Kumar K.V 2026dd919b98SAneesh Kumar K.V 2027ac27a0ecSDave Kleikamp if (!parse_options((char *) data, sb, &journal_inum, &journal_devnum, 2028ac27a0ecSDave Kleikamp NULL, 0)) 2029ac27a0ecSDave Kleikamp goto failed_mount; 2030ac27a0ecSDave Kleikamp 2031ac27a0ecSDave Kleikamp sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 2032617ba13bSMingming Cao ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 2033ac27a0ecSDave Kleikamp 2034617ba13bSMingming Cao if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && 2035617ba13bSMingming Cao (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || 2036617ba13bSMingming Cao EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 2037617ba13bSMingming Cao EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) 2038ac27a0ecSDave Kleikamp printk(KERN_WARNING 2039617ba13bSMingming Cao "EXT4-fs warning: feature flags set on rev 0 fs, " 2040ac27a0ecSDave Kleikamp "running e2fsck is recommended\n"); 2041469108ffSTheodore Tso 2042469108ffSTheodore Tso /* 2043469108ffSTheodore Tso * Since ext4 is still considered development code, we require 2044469108ffSTheodore Tso * that the TEST_FILESYS flag in s->flags be set. 2045469108ffSTheodore Tso */ 2046469108ffSTheodore Tso if (!(le32_to_cpu(es->s_flags) & EXT2_FLAGS_TEST_FILESYS)) { 2047469108ffSTheodore Tso printk(KERN_WARNING "EXT4-fs: %s: not marked " 2048469108ffSTheodore Tso "OK to use with test code.\n", sb->s_id); 2049469108ffSTheodore Tso goto failed_mount; 2050469108ffSTheodore Tso } 2051469108ffSTheodore Tso 2052ac27a0ecSDave Kleikamp /* 2053ac27a0ecSDave Kleikamp * Check feature flags regardless of the revision level, since we 2054ac27a0ecSDave Kleikamp * previously didn't change the revision level when setting the flags, 2055ac27a0ecSDave Kleikamp * so there is a chance incompat flags are set on a rev 0 filesystem. 2056ac27a0ecSDave Kleikamp */ 2057617ba13bSMingming Cao features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP); 2058ac27a0ecSDave Kleikamp if (features) { 2059617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of " 2060ac27a0ecSDave Kleikamp "unsupported optional features (%x).\n", 2061ac27a0ecSDave Kleikamp sb->s_id, le32_to_cpu(features)); 2062ac27a0ecSDave Kleikamp goto failed_mount; 2063ac27a0ecSDave Kleikamp } 2064617ba13bSMingming Cao features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP); 2065ac27a0ecSDave Kleikamp if (!(sb->s_flags & MS_RDONLY) && features) { 2066617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of " 2067ac27a0ecSDave Kleikamp "unsupported optional features (%x).\n", 2068ac27a0ecSDave Kleikamp sb->s_id, le32_to_cpu(features)); 2069ac27a0ecSDave Kleikamp goto failed_mount; 2070ac27a0ecSDave Kleikamp } 20710fc1b451SAneesh Kumar K.V if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) { 20720fc1b451SAneesh Kumar K.V /* 20730fc1b451SAneesh Kumar K.V * Large file size enabled file system can only be 20740fc1b451SAneesh Kumar K.V * mount if kernel is build with CONFIG_LSF 20750fc1b451SAneesh Kumar K.V */ 20760fc1b451SAneesh Kumar K.V if (sizeof(root->i_blocks) < sizeof(u64) && 20770fc1b451SAneesh Kumar K.V !(sb->s_flags & MS_RDONLY)) { 20780fc1b451SAneesh Kumar K.V printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge " 20790fc1b451SAneesh Kumar K.V "files cannot be mounted read-write " 20800fc1b451SAneesh Kumar K.V "without CONFIG_LSF.\n", sb->s_id); 20810fc1b451SAneesh Kumar K.V goto failed_mount; 20820fc1b451SAneesh Kumar K.V } 20830fc1b451SAneesh Kumar K.V } 2084ac27a0ecSDave Kleikamp blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); 2085ac27a0ecSDave Kleikamp 2086617ba13bSMingming Cao if (blocksize < EXT4_MIN_BLOCK_SIZE || 2087617ba13bSMingming Cao blocksize > EXT4_MAX_BLOCK_SIZE) { 2088ac27a0ecSDave Kleikamp printk(KERN_ERR 2089617ba13bSMingming Cao "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n", 2090ac27a0ecSDave Kleikamp blocksize, sb->s_id); 2091ac27a0ecSDave Kleikamp goto failed_mount; 2092ac27a0ecSDave Kleikamp } 2093ac27a0ecSDave Kleikamp 2094ac27a0ecSDave Kleikamp if (sb->s_blocksize != blocksize) { 2095ce40733cSAneesh Kumar K.V 2096ce40733cSAneesh Kumar K.V /* Validate the filesystem blocksize */ 2097ce40733cSAneesh Kumar K.V if (!sb_set_blocksize(sb, blocksize)) { 2098ce40733cSAneesh Kumar K.V printk(KERN_ERR "EXT4-fs: bad block size %d.\n", 2099ce40733cSAneesh Kumar K.V blocksize); 2100ac27a0ecSDave Kleikamp goto failed_mount; 2101ac27a0ecSDave Kleikamp } 2102ac27a0ecSDave Kleikamp 2103ac27a0ecSDave Kleikamp brelse(bh); 210470bbb3e0SAndrew Morton logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 210570bbb3e0SAndrew Morton offset = do_div(logical_sb_block, blocksize); 210670bbb3e0SAndrew Morton bh = sb_bread(sb, logical_sb_block); 2107ac27a0ecSDave Kleikamp if (!bh) { 2108ac27a0ecSDave Kleikamp printk(KERN_ERR 2109617ba13bSMingming Cao "EXT4-fs: Can't read superblock on 2nd try.\n"); 2110ac27a0ecSDave Kleikamp goto failed_mount; 2111ac27a0ecSDave Kleikamp } 2112617ba13bSMingming Cao es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); 2113ac27a0ecSDave Kleikamp sbi->s_es = es; 2114617ba13bSMingming Cao if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { 2115ac27a0ecSDave Kleikamp printk(KERN_ERR 2116617ba13bSMingming Cao "EXT4-fs: Magic mismatch, very weird !\n"); 2117ac27a0ecSDave Kleikamp goto failed_mount; 2118ac27a0ecSDave Kleikamp } 2119ac27a0ecSDave Kleikamp } 2120ac27a0ecSDave Kleikamp 2121e2b46574SEric Sandeen sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits); 2122617ba13bSMingming Cao sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits); 2123ac27a0ecSDave Kleikamp 2124617ba13bSMingming Cao if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { 2125617ba13bSMingming Cao sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; 2126617ba13bSMingming Cao sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; 2127ac27a0ecSDave Kleikamp } else { 2128ac27a0ecSDave Kleikamp sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 2129ac27a0ecSDave Kleikamp sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 2130617ba13bSMingming Cao if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || 21311330593eSVignesh Babu (!is_power_of_2(sbi->s_inode_size)) || 2132ac27a0ecSDave Kleikamp (sbi->s_inode_size > blocksize)) { 2133ac27a0ecSDave Kleikamp printk(KERN_ERR 2134617ba13bSMingming Cao "EXT4-fs: unsupported inode size: %d\n", 2135ac27a0ecSDave Kleikamp sbi->s_inode_size); 2136ac27a0ecSDave Kleikamp goto failed_mount; 2137ac27a0ecSDave Kleikamp } 2138ef7f3835SKalpak Shah if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) 2139ef7f3835SKalpak Shah sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); 2140ac27a0ecSDave Kleikamp } 21410d1ee42fSAlexandre Ratchov sbi->s_desc_size = le16_to_cpu(es->s_desc_size); 21420d1ee42fSAlexandre Ratchov if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { 21438fadc143SAlexandre Ratchov if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || 21440d1ee42fSAlexandre Ratchov sbi->s_desc_size > EXT4_MAX_DESC_SIZE || 2145d8ea6cf8Svignesh babu !is_power_of_2(sbi->s_desc_size)) { 21460d1ee42fSAlexandre Ratchov printk(KERN_ERR 21478fadc143SAlexandre Ratchov "EXT4-fs: unsupported descriptor size %lu\n", 21480d1ee42fSAlexandre Ratchov sbi->s_desc_size); 21490d1ee42fSAlexandre Ratchov goto failed_mount; 21500d1ee42fSAlexandre Ratchov } 21510d1ee42fSAlexandre Ratchov } else 21520d1ee42fSAlexandre Ratchov sbi->s_desc_size = EXT4_MIN_DESC_SIZE; 2153ac27a0ecSDave Kleikamp sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 2154ac27a0ecSDave Kleikamp sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 2155b47b6f38SAndries E. Brouwer if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0) 2156617ba13bSMingming Cao goto cantfind_ext4; 2157617ba13bSMingming Cao sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); 2158ac27a0ecSDave Kleikamp if (sbi->s_inodes_per_block == 0) 2159617ba13bSMingming Cao goto cantfind_ext4; 2160ac27a0ecSDave Kleikamp sbi->s_itb_per_group = sbi->s_inodes_per_group / 2161ac27a0ecSDave Kleikamp sbi->s_inodes_per_block; 21620d1ee42fSAlexandre Ratchov sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); 2163ac27a0ecSDave Kleikamp sbi->s_sbh = bh; 2164ac27a0ecSDave Kleikamp sbi->s_mount_state = le16_to_cpu(es->s_state); 2165e57aa839SFengguang Wu sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); 2166e57aa839SFengguang Wu sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); 2167ac27a0ecSDave Kleikamp for (i = 0; i < 4; i++) 2168ac27a0ecSDave Kleikamp sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); 2169ac27a0ecSDave Kleikamp sbi->s_def_hash_version = es->s_def_hash_version; 2170ac27a0ecSDave Kleikamp 2171ac27a0ecSDave Kleikamp if (sbi->s_blocks_per_group > blocksize * 8) { 2172ac27a0ecSDave Kleikamp printk(KERN_ERR 2173617ba13bSMingming Cao "EXT4-fs: #blocks per group too big: %lu\n", 2174ac27a0ecSDave Kleikamp sbi->s_blocks_per_group); 2175ac27a0ecSDave Kleikamp goto failed_mount; 2176ac27a0ecSDave Kleikamp } 2177ac27a0ecSDave Kleikamp if (sbi->s_inodes_per_group > blocksize * 8) { 2178ac27a0ecSDave Kleikamp printk(KERN_ERR 2179617ba13bSMingming Cao "EXT4-fs: #inodes per group too big: %lu\n", 2180ac27a0ecSDave Kleikamp sbi->s_inodes_per_group); 2181ac27a0ecSDave Kleikamp goto failed_mount; 2182ac27a0ecSDave Kleikamp } 2183ac27a0ecSDave Kleikamp 2184bd81d8eeSLaurent Vivier if (ext4_blocks_count(es) > 2185ac27a0ecSDave Kleikamp (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { 2186617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: filesystem on %s:" 2187ac27a0ecSDave Kleikamp " too large to mount safely\n", sb->s_id); 2188ac27a0ecSDave Kleikamp if (sizeof(sector_t) < 8) 2189617ba13bSMingming Cao printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not " 2190ac27a0ecSDave Kleikamp "enabled\n"); 2191ac27a0ecSDave Kleikamp goto failed_mount; 2192ac27a0ecSDave Kleikamp } 2193ac27a0ecSDave Kleikamp 2194617ba13bSMingming Cao if (EXT4_BLOCKS_PER_GROUP(sb) == 0) 2195617ba13bSMingming Cao goto cantfind_ext4; 2196e7c95593SEric Sandeen 2197e7c95593SEric Sandeen /* ensure blocks_count calculation below doesn't sign-extend */ 2198e7c95593SEric Sandeen if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) < 2199e7c95593SEric Sandeen le32_to_cpu(es->s_first_data_block) + 1) { 2200e7c95593SEric Sandeen printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, " 2201e7c95593SEric Sandeen "first data block %u, blocks per group %lu\n", 2202e7c95593SEric Sandeen ext4_blocks_count(es), 2203e7c95593SEric Sandeen le32_to_cpu(es->s_first_data_block), 2204e7c95593SEric Sandeen EXT4_BLOCKS_PER_GROUP(sb)); 2205e7c95593SEric Sandeen goto failed_mount; 2206e7c95593SEric Sandeen } 2207bd81d8eeSLaurent Vivier blocks_count = (ext4_blocks_count(es) - 2208bd81d8eeSLaurent Vivier le32_to_cpu(es->s_first_data_block) + 2209bd81d8eeSLaurent Vivier EXT4_BLOCKS_PER_GROUP(sb) - 1); 2210bd81d8eeSLaurent Vivier do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); 2211bd81d8eeSLaurent Vivier sbi->s_groups_count = blocks_count; 2212617ba13bSMingming Cao db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / 2213617ba13bSMingming Cao EXT4_DESC_PER_BLOCK(sb); 2214ac27a0ecSDave Kleikamp sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *), 2215ac27a0ecSDave Kleikamp GFP_KERNEL); 2216ac27a0ecSDave Kleikamp if (sbi->s_group_desc == NULL) { 2217617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: not enough memory\n"); 2218ac27a0ecSDave Kleikamp goto failed_mount; 2219ac27a0ecSDave Kleikamp } 2220ac27a0ecSDave Kleikamp 2221ac27a0ecSDave Kleikamp bgl_lock_init(&sbi->s_blockgroup_lock); 2222ac27a0ecSDave Kleikamp 2223ac27a0ecSDave Kleikamp for (i = 0; i < db_count; i++) { 222470bbb3e0SAndrew Morton block = descriptor_loc(sb, logical_sb_block, i); 2225ac27a0ecSDave Kleikamp sbi->s_group_desc[i] = sb_bread(sb, block); 2226ac27a0ecSDave Kleikamp if (!sbi->s_group_desc[i]) { 2227617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: " 2228ac27a0ecSDave Kleikamp "can't read group descriptor %d\n", i); 2229ac27a0ecSDave Kleikamp db_count = i; 2230ac27a0ecSDave Kleikamp goto failed_mount2; 2231ac27a0ecSDave Kleikamp } 2232ac27a0ecSDave Kleikamp } 2233617ba13bSMingming Cao if (!ext4_check_descriptors(sb)) { 2234617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n"); 2235ac27a0ecSDave Kleikamp goto failed_mount2; 2236ac27a0ecSDave Kleikamp } 2237772cb7c8SJose R. Santos if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 2238772cb7c8SJose R. Santos if (!ext4_fill_flex_info(sb)) { 2239772cb7c8SJose R. Santos printk(KERN_ERR 2240772cb7c8SJose R. Santos "EXT4-fs: unable to initialize " 2241772cb7c8SJose R. Santos "flex_bg meta info!\n"); 2242772cb7c8SJose R. Santos goto failed_mount2; 2243772cb7c8SJose R. Santos } 2244772cb7c8SJose R. Santos 2245ac27a0ecSDave Kleikamp sbi->s_gdb_count = db_count; 2246ac27a0ecSDave Kleikamp get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 2247ac27a0ecSDave Kleikamp spin_lock_init(&sbi->s_next_gen_lock); 2248ac27a0ecSDave Kleikamp 2249833f4077SPeter Zijlstra err = percpu_counter_init(&sbi->s_freeblocks_counter, 2250617ba13bSMingming Cao ext4_count_free_blocks(sb)); 2251833f4077SPeter Zijlstra if (!err) { 2252833f4077SPeter Zijlstra err = percpu_counter_init(&sbi->s_freeinodes_counter, 2253617ba13bSMingming Cao ext4_count_free_inodes(sb)); 2254833f4077SPeter Zijlstra } 2255833f4077SPeter Zijlstra if (!err) { 2256833f4077SPeter Zijlstra err = percpu_counter_init(&sbi->s_dirs_counter, 2257617ba13bSMingming Cao ext4_count_dirs(sb)); 2258833f4077SPeter Zijlstra } 2259833f4077SPeter Zijlstra if (err) { 2260833f4077SPeter Zijlstra printk(KERN_ERR "EXT4-fs: insufficient memory\n"); 2261833f4077SPeter Zijlstra goto failed_mount3; 2262833f4077SPeter Zijlstra } 2263ac27a0ecSDave Kleikamp 2264ac27a0ecSDave Kleikamp /* per fileystem reservation list head & lock */ 2265ac27a0ecSDave Kleikamp spin_lock_init(&sbi->s_rsv_window_lock); 2266ac27a0ecSDave Kleikamp sbi->s_rsv_window_root = RB_ROOT; 2267ac27a0ecSDave Kleikamp /* Add a single, static dummy reservation to the start of the 2268ac27a0ecSDave Kleikamp * reservation window list --- it gives us a placeholder for 2269ac27a0ecSDave Kleikamp * append-at-start-of-list which makes the allocation logic 2270ac27a0ecSDave Kleikamp * _much_ simpler. */ 2271617ba13bSMingming Cao sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; 2272617ba13bSMingming Cao sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; 2273ac27a0ecSDave Kleikamp sbi->s_rsv_window_head.rsv_alloc_hit = 0; 2274ac27a0ecSDave Kleikamp sbi->s_rsv_window_head.rsv_goal_size = 0; 2275617ba13bSMingming Cao ext4_rsv_window_add(sb, &sbi->s_rsv_window_head); 2276ac27a0ecSDave Kleikamp 2277c9de560dSAlex Tomas sbi->s_stripe = ext4_get_stripe_size(sbi); 2278c9de560dSAlex Tomas 2279ac27a0ecSDave Kleikamp /* 2280ac27a0ecSDave Kleikamp * set up enough so that it can read an inode 2281ac27a0ecSDave Kleikamp */ 2282617ba13bSMingming Cao sb->s_op = &ext4_sops; 2283617ba13bSMingming Cao sb->s_export_op = &ext4_export_ops; 2284617ba13bSMingming Cao sb->s_xattr = ext4_xattr_handlers; 2285ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 2286617ba13bSMingming Cao sb->s_qcop = &ext4_qctl_operations; 2287617ba13bSMingming Cao sb->dq_op = &ext4_quota_operations; 2288ac27a0ecSDave Kleikamp #endif 2289ac27a0ecSDave Kleikamp INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ 2290ac27a0ecSDave Kleikamp 2291ac27a0ecSDave Kleikamp sb->s_root = NULL; 2292ac27a0ecSDave Kleikamp 2293ac27a0ecSDave Kleikamp needs_recovery = (es->s_last_orphan != 0 || 2294617ba13bSMingming Cao EXT4_HAS_INCOMPAT_FEATURE(sb, 2295617ba13bSMingming Cao EXT4_FEATURE_INCOMPAT_RECOVER)); 2296ac27a0ecSDave Kleikamp 2297ac27a0ecSDave Kleikamp /* 2298ac27a0ecSDave Kleikamp * The first inode we look at is the journal inode. Don't try 2299ac27a0ecSDave Kleikamp * root first: it may be modified in the journal! 2300ac27a0ecSDave Kleikamp */ 2301ac27a0ecSDave Kleikamp if (!test_opt(sb, NOLOAD) && 2302617ba13bSMingming Cao EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 2303617ba13bSMingming Cao if (ext4_load_journal(sb, es, journal_devnum)) 2304ac27a0ecSDave Kleikamp goto failed_mount3; 2305624080edSTheodore Ts'o if (!(sb->s_flags & MS_RDONLY) && 2306624080edSTheodore Ts'o EXT4_SB(sb)->s_journal->j_failed_commit) { 2307624080edSTheodore Ts'o printk(KERN_CRIT "EXT4-fs error (device %s): " 2308624080edSTheodore Ts'o "ext4_fill_super: Journal transaction " 2309624080edSTheodore Ts'o "%u is corrupt\n", sb->s_id, 2310624080edSTheodore Ts'o EXT4_SB(sb)->s_journal->j_failed_commit); 2311624080edSTheodore Ts'o if (test_opt(sb, ERRORS_RO)) { 2312624080edSTheodore Ts'o printk(KERN_CRIT 2313624080edSTheodore Ts'o "Mounting filesystem read-only\n"); 2314624080edSTheodore Ts'o sb->s_flags |= MS_RDONLY; 2315624080edSTheodore Ts'o EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 2316624080edSTheodore Ts'o es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 2317624080edSTheodore Ts'o } 2318624080edSTheodore Ts'o if (test_opt(sb, ERRORS_PANIC)) { 2319624080edSTheodore Ts'o EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 2320624080edSTheodore Ts'o es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 2321624080edSTheodore Ts'o ext4_commit_super(sb, es, 1); 2322624080edSTheodore Ts'o printk(KERN_CRIT 2323624080edSTheodore Ts'o "EXT4-fs (device %s): mount failed\n", 2324624080edSTheodore Ts'o sb->s_id); 2325624080edSTheodore Ts'o goto failed_mount4; 2326624080edSTheodore Ts'o } 2327624080edSTheodore Ts'o } 2328ac27a0ecSDave Kleikamp } else if (journal_inum) { 2329617ba13bSMingming Cao if (ext4_create_journal(sb, es, journal_inum)) 2330ac27a0ecSDave Kleikamp goto failed_mount3; 2331ac27a0ecSDave Kleikamp } else { 2332ac27a0ecSDave Kleikamp if (!silent) 2333ac27a0ecSDave Kleikamp printk(KERN_ERR 2334617ba13bSMingming Cao "ext4: No journal on filesystem on %s\n", 2335ac27a0ecSDave Kleikamp sb->s_id); 2336ac27a0ecSDave Kleikamp goto failed_mount3; 2337ac27a0ecSDave Kleikamp } 2338ac27a0ecSDave Kleikamp 2339eb40a09cSJose R. Santos if (ext4_blocks_count(es) > 0xffffffffULL && 2340eb40a09cSJose R. Santos !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, 2341eb40a09cSJose R. Santos JBD2_FEATURE_INCOMPAT_64BIT)) { 2342eb40a09cSJose R. Santos printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n"); 2343eb40a09cSJose R. Santos goto failed_mount4; 2344eb40a09cSJose R. Santos } 2345eb40a09cSJose R. Santos 2346818d276cSGirish Shilamkar if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 2347818d276cSGirish Shilamkar jbd2_journal_set_features(sbi->s_journal, 2348818d276cSGirish Shilamkar JBD2_FEATURE_COMPAT_CHECKSUM, 0, 2349818d276cSGirish Shilamkar JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2350818d276cSGirish Shilamkar } else if (test_opt(sb, JOURNAL_CHECKSUM)) { 2351818d276cSGirish Shilamkar jbd2_journal_set_features(sbi->s_journal, 2352818d276cSGirish Shilamkar JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0); 2353818d276cSGirish Shilamkar jbd2_journal_clear_features(sbi->s_journal, 0, 0, 2354818d276cSGirish Shilamkar JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2355818d276cSGirish Shilamkar } else { 2356818d276cSGirish Shilamkar jbd2_journal_clear_features(sbi->s_journal, 2357818d276cSGirish Shilamkar JBD2_FEATURE_COMPAT_CHECKSUM, 0, 2358818d276cSGirish Shilamkar JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2359818d276cSGirish Shilamkar } 2360818d276cSGirish Shilamkar 2361ac27a0ecSDave Kleikamp /* We have now updated the journal if required, so we can 2362ac27a0ecSDave Kleikamp * validate the data journaling mode. */ 2363ac27a0ecSDave Kleikamp switch (test_opt(sb, DATA_FLAGS)) { 2364ac27a0ecSDave Kleikamp case 0: 2365ac27a0ecSDave Kleikamp /* No mode set, assume a default based on the journal 236663f57933SAndrew Morton * capabilities: ORDERED_DATA if the journal can 236763f57933SAndrew Morton * cope, else JOURNAL_DATA 236863f57933SAndrew Morton */ 2369dab291afSMingming Cao if (jbd2_journal_check_available_features 2370dab291afSMingming Cao (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) 2371ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, ORDERED_DATA); 2372ac27a0ecSDave Kleikamp else 2373ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, JOURNAL_DATA); 2374ac27a0ecSDave Kleikamp break; 2375ac27a0ecSDave Kleikamp 2376617ba13bSMingming Cao case EXT4_MOUNT_ORDERED_DATA: 2377617ba13bSMingming Cao case EXT4_MOUNT_WRITEBACK_DATA: 2378dab291afSMingming Cao if (!jbd2_journal_check_available_features 2379dab291afSMingming Cao (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { 2380617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: Journal does not support " 2381ac27a0ecSDave Kleikamp "requested data journaling mode\n"); 2382ac27a0ecSDave Kleikamp goto failed_mount4; 2383ac27a0ecSDave Kleikamp } 2384ac27a0ecSDave Kleikamp default: 2385ac27a0ecSDave Kleikamp break; 2386ac27a0ecSDave Kleikamp } 2387ac27a0ecSDave Kleikamp 2388ac27a0ecSDave Kleikamp if (test_opt(sb, NOBH)) { 2389617ba13bSMingming Cao if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) { 2390617ba13bSMingming Cao printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - " 2391ac27a0ecSDave Kleikamp "its supported only with writeback mode\n"); 2392ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, NOBH); 2393ac27a0ecSDave Kleikamp } 2394ac27a0ecSDave Kleikamp } 2395ac27a0ecSDave Kleikamp /* 2396dab291afSMingming Cao * The jbd2_journal_load will have done any necessary log recovery, 2397ac27a0ecSDave Kleikamp * so we can safely mount the rest of the filesystem now. 2398ac27a0ecSDave Kleikamp */ 2399ac27a0ecSDave Kleikamp 24001d1fe1eeSDavid Howells root = ext4_iget(sb, EXT4_ROOT_INO); 24011d1fe1eeSDavid Howells if (IS_ERR(root)) { 2402617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: get root inode failed\n"); 24031d1fe1eeSDavid Howells ret = PTR_ERR(root); 2404ac27a0ecSDave Kleikamp goto failed_mount4; 2405ac27a0ecSDave Kleikamp } 2406ac27a0ecSDave Kleikamp if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 24071d1fe1eeSDavid Howells iput(root); 2408617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n"); 2409ac27a0ecSDave Kleikamp goto failed_mount4; 2410ac27a0ecSDave Kleikamp } 24111d1fe1eeSDavid Howells sb->s_root = d_alloc_root(root); 24121d1fe1eeSDavid Howells if (!sb->s_root) { 24131d1fe1eeSDavid Howells printk(KERN_ERR "EXT4-fs: get root dentry failed\n"); 24141d1fe1eeSDavid Howells iput(root); 24151d1fe1eeSDavid Howells ret = -ENOMEM; 24161d1fe1eeSDavid Howells goto failed_mount4; 24171d1fe1eeSDavid Howells } 2418ac27a0ecSDave Kleikamp 2419617ba13bSMingming Cao ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY); 2420ef7f3835SKalpak Shah 2421ef7f3835SKalpak Shah /* determine the minimum size of new large inodes, if present */ 2422ef7f3835SKalpak Shah if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { 2423ef7f3835SKalpak Shah sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 2424ef7f3835SKalpak Shah EXT4_GOOD_OLD_INODE_SIZE; 2425ef7f3835SKalpak Shah if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 2426ef7f3835SKalpak Shah EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { 2427ef7f3835SKalpak Shah if (sbi->s_want_extra_isize < 2428ef7f3835SKalpak Shah le16_to_cpu(es->s_want_extra_isize)) 2429ef7f3835SKalpak Shah sbi->s_want_extra_isize = 2430ef7f3835SKalpak Shah le16_to_cpu(es->s_want_extra_isize); 2431ef7f3835SKalpak Shah if (sbi->s_want_extra_isize < 2432ef7f3835SKalpak Shah le16_to_cpu(es->s_min_extra_isize)) 2433ef7f3835SKalpak Shah sbi->s_want_extra_isize = 2434ef7f3835SKalpak Shah le16_to_cpu(es->s_min_extra_isize); 2435ef7f3835SKalpak Shah } 2436ef7f3835SKalpak Shah } 2437ef7f3835SKalpak Shah /* Check if enough inode space is available */ 2438ef7f3835SKalpak Shah if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > 2439ef7f3835SKalpak Shah sbi->s_inode_size) { 2440ef7f3835SKalpak Shah sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 2441ef7f3835SKalpak Shah EXT4_GOOD_OLD_INODE_SIZE; 2442ef7f3835SKalpak Shah printk(KERN_INFO "EXT4-fs: required extra inode space not" 2443ef7f3835SKalpak Shah "available.\n"); 2444ef7f3835SKalpak Shah } 2445ef7f3835SKalpak Shah 2446ac27a0ecSDave Kleikamp /* 2447ac27a0ecSDave Kleikamp * akpm: core read_super() calls in here with the superblock locked. 2448ac27a0ecSDave Kleikamp * That deadlocks, because orphan cleanup needs to lock the superblock 2449ac27a0ecSDave Kleikamp * in numerous places. Here we just pop the lock - it's relatively 2450ac27a0ecSDave Kleikamp * harmless, because we are now ready to accept write_super() requests, 2451ac27a0ecSDave Kleikamp * and aviro says that's the only reason for hanging onto the 2452ac27a0ecSDave Kleikamp * superblock lock. 2453ac27a0ecSDave Kleikamp */ 2454617ba13bSMingming Cao EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; 2455617ba13bSMingming Cao ext4_orphan_cleanup(sb, es); 2456617ba13bSMingming Cao EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; 2457ac27a0ecSDave Kleikamp if (needs_recovery) 2458617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: recovery complete.\n"); 2459617ba13bSMingming Cao ext4_mark_recovery_complete(sb, es); 2460617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n", 2461617ba13bSMingming Cao test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal": 2462617ba13bSMingming Cao test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered": 2463ac27a0ecSDave Kleikamp "writeback"); 2464ac27a0ecSDave Kleikamp 2465dd919b98SAneesh Kumar K.V if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { 2466dd919b98SAneesh Kumar K.V printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - " 2467dd919b98SAneesh Kumar K.V "requested data journaling mode\n"); 2468dd919b98SAneesh Kumar K.V clear_opt(sbi->s_mount_opt, DELALLOC); 2469dd919b98SAneesh Kumar K.V } else if (test_opt(sb, DELALLOC)) 2470dd919b98SAneesh Kumar K.V printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n"); 2471dd919b98SAneesh Kumar K.V 2472a86c6181SAlex Tomas ext4_ext_init(sb); 2473c9de560dSAlex Tomas ext4_mb_init(sb, needs_recovery); 2474a86c6181SAlex Tomas 2475ac27a0ecSDave Kleikamp lock_kernel(); 2476ac27a0ecSDave Kleikamp return 0; 2477ac27a0ecSDave Kleikamp 2478617ba13bSMingming Cao cantfind_ext4: 2479ac27a0ecSDave Kleikamp if (!silent) 2480617ba13bSMingming Cao printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n", 2481ac27a0ecSDave Kleikamp sb->s_id); 2482ac27a0ecSDave Kleikamp goto failed_mount; 2483ac27a0ecSDave Kleikamp 2484ac27a0ecSDave Kleikamp failed_mount4: 2485dab291afSMingming Cao jbd2_journal_destroy(sbi->s_journal); 248647b4a50bSJan Kara sbi->s_journal = NULL; 2487ac27a0ecSDave Kleikamp failed_mount3: 2488ac27a0ecSDave Kleikamp percpu_counter_destroy(&sbi->s_freeblocks_counter); 2489ac27a0ecSDave Kleikamp percpu_counter_destroy(&sbi->s_freeinodes_counter); 2490ac27a0ecSDave Kleikamp percpu_counter_destroy(&sbi->s_dirs_counter); 2491ac27a0ecSDave Kleikamp failed_mount2: 2492ac27a0ecSDave Kleikamp for (i = 0; i < db_count; i++) 2493ac27a0ecSDave Kleikamp brelse(sbi->s_group_desc[i]); 2494ac27a0ecSDave Kleikamp kfree(sbi->s_group_desc); 2495ac27a0ecSDave Kleikamp failed_mount: 2496ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 2497ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) 2498ac27a0ecSDave Kleikamp kfree(sbi->s_qf_names[i]); 2499ac27a0ecSDave Kleikamp #endif 2500617ba13bSMingming Cao ext4_blkdev_remove(sbi); 2501ac27a0ecSDave Kleikamp brelse(bh); 2502ac27a0ecSDave Kleikamp out_fail: 2503ac27a0ecSDave Kleikamp sb->s_fs_info = NULL; 2504ac27a0ecSDave Kleikamp kfree(sbi); 2505ac27a0ecSDave Kleikamp lock_kernel(); 25061d1fe1eeSDavid Howells return ret; 2507ac27a0ecSDave Kleikamp } 2508ac27a0ecSDave Kleikamp 2509ac27a0ecSDave Kleikamp /* 2510ac27a0ecSDave Kleikamp * Setup any per-fs journal parameters now. We'll do this both on 2511ac27a0ecSDave Kleikamp * initial mount, once the journal has been initialised but before we've 2512ac27a0ecSDave Kleikamp * done any recovery; and again on any subsequent remount. 2513ac27a0ecSDave Kleikamp */ 2514617ba13bSMingming Cao static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) 2515ac27a0ecSDave Kleikamp { 2516617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 2517ac27a0ecSDave Kleikamp 2518ac27a0ecSDave Kleikamp if (sbi->s_commit_interval) 2519ac27a0ecSDave Kleikamp journal->j_commit_interval = sbi->s_commit_interval; 2520617ba13bSMingming Cao /* We could also set up an ext4-specific default for the commit 2521ac27a0ecSDave Kleikamp * interval here, but for now we'll just fall back to the jbd 2522ac27a0ecSDave Kleikamp * default. */ 2523ac27a0ecSDave Kleikamp 2524ac27a0ecSDave Kleikamp spin_lock(&journal->j_state_lock); 2525ac27a0ecSDave Kleikamp if (test_opt(sb, BARRIER)) 2526dab291afSMingming Cao journal->j_flags |= JBD2_BARRIER; 2527ac27a0ecSDave Kleikamp else 2528dab291afSMingming Cao journal->j_flags &= ~JBD2_BARRIER; 2529ac27a0ecSDave Kleikamp spin_unlock(&journal->j_state_lock); 2530ac27a0ecSDave Kleikamp } 2531ac27a0ecSDave Kleikamp 2532617ba13bSMingming Cao static journal_t *ext4_get_journal(struct super_block *sb, 2533ac27a0ecSDave Kleikamp unsigned int journal_inum) 2534ac27a0ecSDave Kleikamp { 2535ac27a0ecSDave Kleikamp struct inode *journal_inode; 2536ac27a0ecSDave Kleikamp journal_t *journal; 2537ac27a0ecSDave Kleikamp 2538ac27a0ecSDave Kleikamp /* First, test for the existence of a valid inode on disk. Bad 2539ac27a0ecSDave Kleikamp * things happen if we iget() an unused inode, as the subsequent 2540ac27a0ecSDave Kleikamp * iput() will try to delete it. */ 2541ac27a0ecSDave Kleikamp 25421d1fe1eeSDavid Howells journal_inode = ext4_iget(sb, journal_inum); 25431d1fe1eeSDavid Howells if (IS_ERR(journal_inode)) { 2544617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: no journal found.\n"); 2545ac27a0ecSDave Kleikamp return NULL; 2546ac27a0ecSDave Kleikamp } 2547ac27a0ecSDave Kleikamp if (!journal_inode->i_nlink) { 2548ac27a0ecSDave Kleikamp make_bad_inode(journal_inode); 2549ac27a0ecSDave Kleikamp iput(journal_inode); 2550617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n"); 2551ac27a0ecSDave Kleikamp return NULL; 2552ac27a0ecSDave Kleikamp } 2553ac27a0ecSDave Kleikamp 2554ac27a0ecSDave Kleikamp jbd_debug(2, "Journal inode found at %p: %Ld bytes\n", 2555ac27a0ecSDave Kleikamp journal_inode, journal_inode->i_size); 25561d1fe1eeSDavid Howells if (!S_ISREG(journal_inode->i_mode)) { 2557617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: invalid journal inode.\n"); 2558ac27a0ecSDave Kleikamp iput(journal_inode); 2559ac27a0ecSDave Kleikamp return NULL; 2560ac27a0ecSDave Kleikamp } 2561ac27a0ecSDave Kleikamp 2562dab291afSMingming Cao journal = jbd2_journal_init_inode(journal_inode); 2563ac27a0ecSDave Kleikamp if (!journal) { 2564617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: Could not load journal inode\n"); 2565ac27a0ecSDave Kleikamp iput(journal_inode); 2566ac27a0ecSDave Kleikamp return NULL; 2567ac27a0ecSDave Kleikamp } 2568ac27a0ecSDave Kleikamp journal->j_private = sb; 2569617ba13bSMingming Cao ext4_init_journal_params(sb, journal); 2570ac27a0ecSDave Kleikamp return journal; 2571ac27a0ecSDave Kleikamp } 2572ac27a0ecSDave Kleikamp 2573617ba13bSMingming Cao static journal_t *ext4_get_dev_journal(struct super_block *sb, 2574ac27a0ecSDave Kleikamp dev_t j_dev) 2575ac27a0ecSDave Kleikamp { 2576ac27a0ecSDave Kleikamp struct buffer_head *bh; 2577ac27a0ecSDave Kleikamp journal_t *journal; 2578617ba13bSMingming Cao ext4_fsblk_t start; 2579617ba13bSMingming Cao ext4_fsblk_t len; 2580ac27a0ecSDave Kleikamp int hblock, blocksize; 2581617ba13bSMingming Cao ext4_fsblk_t sb_block; 2582ac27a0ecSDave Kleikamp unsigned long offset; 2583617ba13bSMingming Cao struct ext4_super_block *es; 2584ac27a0ecSDave Kleikamp struct block_device *bdev; 2585ac27a0ecSDave Kleikamp 2586617ba13bSMingming Cao bdev = ext4_blkdev_get(j_dev); 2587ac27a0ecSDave Kleikamp if (bdev == NULL) 2588ac27a0ecSDave Kleikamp return NULL; 2589ac27a0ecSDave Kleikamp 2590ac27a0ecSDave Kleikamp if (bd_claim(bdev, sb)) { 2591ac27a0ecSDave Kleikamp printk(KERN_ERR 2592617ba13bSMingming Cao "EXT4: failed to claim external journal device.\n"); 2593ac27a0ecSDave Kleikamp blkdev_put(bdev); 2594ac27a0ecSDave Kleikamp return NULL; 2595ac27a0ecSDave Kleikamp } 2596ac27a0ecSDave Kleikamp 2597ac27a0ecSDave Kleikamp blocksize = sb->s_blocksize; 2598ac27a0ecSDave Kleikamp hblock = bdev_hardsect_size(bdev); 2599ac27a0ecSDave Kleikamp if (blocksize < hblock) { 2600ac27a0ecSDave Kleikamp printk(KERN_ERR 2601617ba13bSMingming Cao "EXT4-fs: blocksize too small for journal device.\n"); 2602ac27a0ecSDave Kleikamp goto out_bdev; 2603ac27a0ecSDave Kleikamp } 2604ac27a0ecSDave Kleikamp 2605617ba13bSMingming Cao sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; 2606617ba13bSMingming Cao offset = EXT4_MIN_BLOCK_SIZE % blocksize; 2607ac27a0ecSDave Kleikamp set_blocksize(bdev, blocksize); 2608ac27a0ecSDave Kleikamp if (!(bh = __bread(bdev, sb_block, blocksize))) { 2609617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: couldn't read superblock of " 2610ac27a0ecSDave Kleikamp "external journal\n"); 2611ac27a0ecSDave Kleikamp goto out_bdev; 2612ac27a0ecSDave Kleikamp } 2613ac27a0ecSDave Kleikamp 2614617ba13bSMingming Cao es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 2615617ba13bSMingming Cao if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || 2616ac27a0ecSDave Kleikamp !(le32_to_cpu(es->s_feature_incompat) & 2617617ba13bSMingming Cao EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { 2618617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: external journal has " 2619ac27a0ecSDave Kleikamp "bad superblock\n"); 2620ac27a0ecSDave Kleikamp brelse(bh); 2621ac27a0ecSDave Kleikamp goto out_bdev; 2622ac27a0ecSDave Kleikamp } 2623ac27a0ecSDave Kleikamp 2624617ba13bSMingming Cao if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { 2625617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: journal UUID does not match\n"); 2626ac27a0ecSDave Kleikamp brelse(bh); 2627ac27a0ecSDave Kleikamp goto out_bdev; 2628ac27a0ecSDave Kleikamp } 2629ac27a0ecSDave Kleikamp 2630bd81d8eeSLaurent Vivier len = ext4_blocks_count(es); 2631ac27a0ecSDave Kleikamp start = sb_block + 1; 2632ac27a0ecSDave Kleikamp brelse(bh); /* we're done with the superblock */ 2633ac27a0ecSDave Kleikamp 2634dab291afSMingming Cao journal = jbd2_journal_init_dev(bdev, sb->s_bdev, 2635ac27a0ecSDave Kleikamp start, len, blocksize); 2636ac27a0ecSDave Kleikamp if (!journal) { 2637617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: failed to create device journal\n"); 2638ac27a0ecSDave Kleikamp goto out_bdev; 2639ac27a0ecSDave Kleikamp } 2640ac27a0ecSDave Kleikamp journal->j_private = sb; 2641ac27a0ecSDave Kleikamp ll_rw_block(READ, 1, &journal->j_sb_buffer); 2642ac27a0ecSDave Kleikamp wait_on_buffer(journal->j_sb_buffer); 2643ac27a0ecSDave Kleikamp if (!buffer_uptodate(journal->j_sb_buffer)) { 2644617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: I/O error on journal device\n"); 2645ac27a0ecSDave Kleikamp goto out_journal; 2646ac27a0ecSDave Kleikamp } 2647ac27a0ecSDave Kleikamp if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { 2648617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: External journal has more than one " 2649ac27a0ecSDave Kleikamp "user (unsupported) - %d\n", 2650ac27a0ecSDave Kleikamp be32_to_cpu(journal->j_superblock->s_nr_users)); 2651ac27a0ecSDave Kleikamp goto out_journal; 2652ac27a0ecSDave Kleikamp } 2653617ba13bSMingming Cao EXT4_SB(sb)->journal_bdev = bdev; 2654617ba13bSMingming Cao ext4_init_journal_params(sb, journal); 2655ac27a0ecSDave Kleikamp return journal; 2656ac27a0ecSDave Kleikamp out_journal: 2657dab291afSMingming Cao jbd2_journal_destroy(journal); 2658ac27a0ecSDave Kleikamp out_bdev: 2659617ba13bSMingming Cao ext4_blkdev_put(bdev); 2660ac27a0ecSDave Kleikamp return NULL; 2661ac27a0ecSDave Kleikamp } 2662ac27a0ecSDave Kleikamp 2663617ba13bSMingming Cao static int ext4_load_journal(struct super_block *sb, 2664617ba13bSMingming Cao struct ext4_super_block *es, 2665ac27a0ecSDave Kleikamp unsigned long journal_devnum) 2666ac27a0ecSDave Kleikamp { 2667ac27a0ecSDave Kleikamp journal_t *journal; 2668ac27a0ecSDave Kleikamp unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); 2669ac27a0ecSDave Kleikamp dev_t journal_dev; 2670ac27a0ecSDave Kleikamp int err = 0; 2671ac27a0ecSDave Kleikamp int really_read_only; 2672ac27a0ecSDave Kleikamp 2673ac27a0ecSDave Kleikamp if (journal_devnum && 2674ac27a0ecSDave Kleikamp journal_devnum != le32_to_cpu(es->s_journal_dev)) { 2675617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: external journal device major/minor " 2676ac27a0ecSDave Kleikamp "numbers have changed\n"); 2677ac27a0ecSDave Kleikamp journal_dev = new_decode_dev(journal_devnum); 2678ac27a0ecSDave Kleikamp } else 2679ac27a0ecSDave Kleikamp journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); 2680ac27a0ecSDave Kleikamp 2681ac27a0ecSDave Kleikamp really_read_only = bdev_read_only(sb->s_bdev); 2682ac27a0ecSDave Kleikamp 2683ac27a0ecSDave Kleikamp /* 2684ac27a0ecSDave Kleikamp * Are we loading a blank journal or performing recovery after a 2685ac27a0ecSDave Kleikamp * crash? For recovery, we need to check in advance whether we 2686ac27a0ecSDave Kleikamp * can get read-write access to the device. 2687ac27a0ecSDave Kleikamp */ 2688ac27a0ecSDave Kleikamp 2689617ba13bSMingming Cao if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 2690ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) { 2691617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: INFO: recovery " 2692ac27a0ecSDave Kleikamp "required on readonly filesystem.\n"); 2693ac27a0ecSDave Kleikamp if (really_read_only) { 2694617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: write access " 2695ac27a0ecSDave Kleikamp "unavailable, cannot proceed.\n"); 2696ac27a0ecSDave Kleikamp return -EROFS; 2697ac27a0ecSDave Kleikamp } 2698617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: write access will " 2699ac27a0ecSDave Kleikamp "be enabled during recovery.\n"); 2700ac27a0ecSDave Kleikamp } 2701ac27a0ecSDave Kleikamp } 2702ac27a0ecSDave Kleikamp 2703ac27a0ecSDave Kleikamp if (journal_inum && journal_dev) { 2704617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: filesystem has both journal " 2705ac27a0ecSDave Kleikamp "and inode journals!\n"); 2706ac27a0ecSDave Kleikamp return -EINVAL; 2707ac27a0ecSDave Kleikamp } 2708ac27a0ecSDave Kleikamp 2709ac27a0ecSDave Kleikamp if (journal_inum) { 2710617ba13bSMingming Cao if (!(journal = ext4_get_journal(sb, journal_inum))) 2711ac27a0ecSDave Kleikamp return -EINVAL; 2712ac27a0ecSDave Kleikamp } else { 2713617ba13bSMingming Cao if (!(journal = ext4_get_dev_journal(sb, journal_dev))) 2714ac27a0ecSDave Kleikamp return -EINVAL; 2715ac27a0ecSDave Kleikamp } 2716ac27a0ecSDave Kleikamp 2717ac27a0ecSDave Kleikamp if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { 2718dab291afSMingming Cao err = jbd2_journal_update_format(journal); 2719ac27a0ecSDave Kleikamp if (err) { 2720617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: error updating journal.\n"); 2721dab291afSMingming Cao jbd2_journal_destroy(journal); 2722ac27a0ecSDave Kleikamp return err; 2723ac27a0ecSDave Kleikamp } 2724ac27a0ecSDave Kleikamp } 2725ac27a0ecSDave Kleikamp 2726617ba13bSMingming Cao if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) 2727dab291afSMingming Cao err = jbd2_journal_wipe(journal, !really_read_only); 2728ac27a0ecSDave Kleikamp if (!err) 2729dab291afSMingming Cao err = jbd2_journal_load(journal); 2730ac27a0ecSDave Kleikamp 2731ac27a0ecSDave Kleikamp if (err) { 2732617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: error loading journal.\n"); 2733dab291afSMingming Cao jbd2_journal_destroy(journal); 2734ac27a0ecSDave Kleikamp return err; 2735ac27a0ecSDave Kleikamp } 2736ac27a0ecSDave Kleikamp 2737617ba13bSMingming Cao EXT4_SB(sb)->s_journal = journal; 2738617ba13bSMingming Cao ext4_clear_journal_err(sb, es); 2739ac27a0ecSDave Kleikamp 2740ac27a0ecSDave Kleikamp if (journal_devnum && 2741ac27a0ecSDave Kleikamp journal_devnum != le32_to_cpu(es->s_journal_dev)) { 2742ac27a0ecSDave Kleikamp es->s_journal_dev = cpu_to_le32(journal_devnum); 2743ac27a0ecSDave Kleikamp sb->s_dirt = 1; 2744ac27a0ecSDave Kleikamp 2745ac27a0ecSDave Kleikamp /* Make sure we flush the recovery flag to disk. */ 2746617ba13bSMingming Cao ext4_commit_super(sb, es, 1); 2747ac27a0ecSDave Kleikamp } 2748ac27a0ecSDave Kleikamp 2749ac27a0ecSDave Kleikamp return 0; 2750ac27a0ecSDave Kleikamp } 2751ac27a0ecSDave Kleikamp 2752617ba13bSMingming Cao static int ext4_create_journal(struct super_block *sb, 2753617ba13bSMingming Cao struct ext4_super_block *es, 2754ac27a0ecSDave Kleikamp unsigned int journal_inum) 2755ac27a0ecSDave Kleikamp { 2756ac27a0ecSDave Kleikamp journal_t *journal; 27576c675bd4SBorislav Petkov int err; 2758ac27a0ecSDave Kleikamp 2759ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) { 2760617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to " 2761ac27a0ecSDave Kleikamp "create journal.\n"); 2762ac27a0ecSDave Kleikamp return -EROFS; 2763ac27a0ecSDave Kleikamp } 2764ac27a0ecSDave Kleikamp 27656c675bd4SBorislav Petkov journal = ext4_get_journal(sb, journal_inum); 27666c675bd4SBorislav Petkov if (!journal) 2767ac27a0ecSDave Kleikamp return -EINVAL; 2768ac27a0ecSDave Kleikamp 2769617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n", 2770ac27a0ecSDave Kleikamp journal_inum); 2771ac27a0ecSDave Kleikamp 27726c675bd4SBorislav Petkov err = jbd2_journal_create(journal); 27736c675bd4SBorislav Petkov if (err) { 2774617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: error creating journal.\n"); 2775dab291afSMingming Cao jbd2_journal_destroy(journal); 2776ac27a0ecSDave Kleikamp return -EIO; 2777ac27a0ecSDave Kleikamp } 2778ac27a0ecSDave Kleikamp 2779617ba13bSMingming Cao EXT4_SB(sb)->s_journal = journal; 2780ac27a0ecSDave Kleikamp 2781617ba13bSMingming Cao ext4_update_dynamic_rev(sb); 2782617ba13bSMingming Cao EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2783617ba13bSMingming Cao EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL); 2784ac27a0ecSDave Kleikamp 2785ac27a0ecSDave Kleikamp es->s_journal_inum = cpu_to_le32(journal_inum); 2786ac27a0ecSDave Kleikamp sb->s_dirt = 1; 2787ac27a0ecSDave Kleikamp 2788ac27a0ecSDave Kleikamp /* Make sure we flush the recovery flag to disk. */ 2789617ba13bSMingming Cao ext4_commit_super(sb, es, 1); 2790ac27a0ecSDave Kleikamp 2791ac27a0ecSDave Kleikamp return 0; 2792ac27a0ecSDave Kleikamp } 2793ac27a0ecSDave Kleikamp 2794617ba13bSMingming Cao static void ext4_commit_super(struct super_block *sb, 2795*2b2d6d01STheodore Ts'o struct ext4_super_block *es, int sync) 2796ac27a0ecSDave Kleikamp { 2797617ba13bSMingming Cao struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; 2798ac27a0ecSDave Kleikamp 2799ac27a0ecSDave Kleikamp if (!sbh) 2800ac27a0ecSDave Kleikamp return; 2801ac27a0ecSDave Kleikamp es->s_wtime = cpu_to_le32(get_seconds()); 2802bd81d8eeSLaurent Vivier ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb)); 2803617ba13bSMingming Cao es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb)); 2804ac27a0ecSDave Kleikamp BUFFER_TRACE(sbh, "marking dirty"); 2805ac27a0ecSDave Kleikamp mark_buffer_dirty(sbh); 2806ac27a0ecSDave Kleikamp if (sync) 2807ac27a0ecSDave Kleikamp sync_dirty_buffer(sbh); 2808ac27a0ecSDave Kleikamp } 2809ac27a0ecSDave Kleikamp 2810ac27a0ecSDave Kleikamp 2811ac27a0ecSDave Kleikamp /* 2812ac27a0ecSDave Kleikamp * Have we just finished recovery? If so, and if we are mounting (or 2813ac27a0ecSDave Kleikamp * remounting) the filesystem readonly, then we will end up with a 2814ac27a0ecSDave Kleikamp * consistent fs on disk. Record that fact. 2815ac27a0ecSDave Kleikamp */ 2816617ba13bSMingming Cao static void ext4_mark_recovery_complete(struct super_block *sb, 2817617ba13bSMingming Cao struct ext4_super_block *es) 2818ac27a0ecSDave Kleikamp { 2819617ba13bSMingming Cao journal_t *journal = EXT4_SB(sb)->s_journal; 2820ac27a0ecSDave Kleikamp 2821dab291afSMingming Cao jbd2_journal_lock_updates(journal); 2822dab291afSMingming Cao jbd2_journal_flush(journal); 282332c37730SJan Kara lock_super(sb); 2824617ba13bSMingming Cao if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && 2825ac27a0ecSDave Kleikamp sb->s_flags & MS_RDONLY) { 2826617ba13bSMingming Cao EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2827ac27a0ecSDave Kleikamp sb->s_dirt = 0; 2828617ba13bSMingming Cao ext4_commit_super(sb, es, 1); 2829ac27a0ecSDave Kleikamp } 283032c37730SJan Kara unlock_super(sb); 2831dab291afSMingming Cao jbd2_journal_unlock_updates(journal); 2832ac27a0ecSDave Kleikamp } 2833ac27a0ecSDave Kleikamp 2834ac27a0ecSDave Kleikamp /* 2835ac27a0ecSDave Kleikamp * If we are mounting (or read-write remounting) a filesystem whose journal 2836ac27a0ecSDave Kleikamp * has recorded an error from a previous lifetime, move that error to the 2837ac27a0ecSDave Kleikamp * main filesystem now. 2838ac27a0ecSDave Kleikamp */ 2839617ba13bSMingming Cao static void ext4_clear_journal_err(struct super_block *sb, 2840617ba13bSMingming Cao struct ext4_super_block *es) 2841ac27a0ecSDave Kleikamp { 2842ac27a0ecSDave Kleikamp journal_t *journal; 2843ac27a0ecSDave Kleikamp int j_errno; 2844ac27a0ecSDave Kleikamp const char *errstr; 2845ac27a0ecSDave Kleikamp 2846617ba13bSMingming Cao journal = EXT4_SB(sb)->s_journal; 2847ac27a0ecSDave Kleikamp 2848ac27a0ecSDave Kleikamp /* 2849ac27a0ecSDave Kleikamp * Now check for any error status which may have been recorded in the 2850617ba13bSMingming Cao * journal by a prior ext4_error() or ext4_abort() 2851ac27a0ecSDave Kleikamp */ 2852ac27a0ecSDave Kleikamp 2853dab291afSMingming Cao j_errno = jbd2_journal_errno(journal); 2854ac27a0ecSDave Kleikamp if (j_errno) { 2855ac27a0ecSDave Kleikamp char nbuf[16]; 2856ac27a0ecSDave Kleikamp 2857617ba13bSMingming Cao errstr = ext4_decode_error(sb, j_errno, nbuf); 285846e665e9SHarvey Harrison ext4_warning(sb, __func__, "Filesystem error recorded " 2859ac27a0ecSDave Kleikamp "from previous mount: %s", errstr); 286046e665e9SHarvey Harrison ext4_warning(sb, __func__, "Marking fs in need of " 2861ac27a0ecSDave Kleikamp "filesystem check."); 2862ac27a0ecSDave Kleikamp 2863617ba13bSMingming Cao EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 2864617ba13bSMingming Cao es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 2865617ba13bSMingming Cao ext4_commit_super(sb, es, 1); 2866ac27a0ecSDave Kleikamp 2867dab291afSMingming Cao jbd2_journal_clear_err(journal); 2868ac27a0ecSDave Kleikamp } 2869ac27a0ecSDave Kleikamp } 2870ac27a0ecSDave Kleikamp 2871ac27a0ecSDave Kleikamp /* 2872ac27a0ecSDave Kleikamp * Force the running and committing transactions to commit, 2873ac27a0ecSDave Kleikamp * and wait on the commit. 2874ac27a0ecSDave Kleikamp */ 2875617ba13bSMingming Cao int ext4_force_commit(struct super_block *sb) 2876ac27a0ecSDave Kleikamp { 2877ac27a0ecSDave Kleikamp journal_t *journal; 2878ac27a0ecSDave Kleikamp int ret; 2879ac27a0ecSDave Kleikamp 2880ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) 2881ac27a0ecSDave Kleikamp return 0; 2882ac27a0ecSDave Kleikamp 2883617ba13bSMingming Cao journal = EXT4_SB(sb)->s_journal; 2884ac27a0ecSDave Kleikamp sb->s_dirt = 0; 2885617ba13bSMingming Cao ret = ext4_journal_force_commit(journal); 2886ac27a0ecSDave Kleikamp return ret; 2887ac27a0ecSDave Kleikamp } 2888ac27a0ecSDave Kleikamp 2889ac27a0ecSDave Kleikamp /* 2890617ba13bSMingming Cao * Ext4 always journals updates to the superblock itself, so we don't 2891ac27a0ecSDave Kleikamp * have to propagate any other updates to the superblock on disk at this 2892ac27a0ecSDave Kleikamp * point. Just start an async writeback to get the buffers on their way 2893ac27a0ecSDave Kleikamp * to the disk. 2894ac27a0ecSDave Kleikamp * 2895ac27a0ecSDave Kleikamp * This implicitly triggers the writebehind on sync(). 2896ac27a0ecSDave Kleikamp */ 2897ac27a0ecSDave Kleikamp 2898617ba13bSMingming Cao static void ext4_write_super(struct super_block *sb) 2899ac27a0ecSDave Kleikamp { 2900ac27a0ecSDave Kleikamp if (mutex_trylock(&sb->s_lock) != 0) 2901ac27a0ecSDave Kleikamp BUG(); 2902ac27a0ecSDave Kleikamp sb->s_dirt = 0; 2903ac27a0ecSDave Kleikamp } 2904ac27a0ecSDave Kleikamp 2905617ba13bSMingming Cao static int ext4_sync_fs(struct super_block *sb, int wait) 2906ac27a0ecSDave Kleikamp { 2907ac27a0ecSDave Kleikamp tid_t target; 2908ac27a0ecSDave Kleikamp 2909ac27a0ecSDave Kleikamp sb->s_dirt = 0; 2910dab291afSMingming Cao if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) { 2911ac27a0ecSDave Kleikamp if (wait) 2912dab291afSMingming Cao jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target); 2913ac27a0ecSDave Kleikamp } 2914ac27a0ecSDave Kleikamp return 0; 2915ac27a0ecSDave Kleikamp } 2916ac27a0ecSDave Kleikamp 2917ac27a0ecSDave Kleikamp /* 2918ac27a0ecSDave Kleikamp * LVM calls this function before a (read-only) snapshot is created. This 2919ac27a0ecSDave Kleikamp * gives us a chance to flush the journal completely and mark the fs clean. 2920ac27a0ecSDave Kleikamp */ 2921617ba13bSMingming Cao static void ext4_write_super_lockfs(struct super_block *sb) 2922ac27a0ecSDave Kleikamp { 2923ac27a0ecSDave Kleikamp sb->s_dirt = 0; 2924ac27a0ecSDave Kleikamp 2925ac27a0ecSDave Kleikamp if (!(sb->s_flags & MS_RDONLY)) { 2926617ba13bSMingming Cao journal_t *journal = EXT4_SB(sb)->s_journal; 2927ac27a0ecSDave Kleikamp 2928ac27a0ecSDave Kleikamp /* Now we set up the journal barrier. */ 2929dab291afSMingming Cao jbd2_journal_lock_updates(journal); 2930dab291afSMingming Cao jbd2_journal_flush(journal); 2931ac27a0ecSDave Kleikamp 2932ac27a0ecSDave Kleikamp /* Journal blocked and flushed, clear needs_recovery flag. */ 2933617ba13bSMingming Cao EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2934617ba13bSMingming Cao ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); 2935ac27a0ecSDave Kleikamp } 2936ac27a0ecSDave Kleikamp } 2937ac27a0ecSDave Kleikamp 2938ac27a0ecSDave Kleikamp /* 2939ac27a0ecSDave Kleikamp * Called by LVM after the snapshot is done. We need to reset the RECOVER 2940ac27a0ecSDave Kleikamp * flag here, even though the filesystem is not technically dirty yet. 2941ac27a0ecSDave Kleikamp */ 2942617ba13bSMingming Cao static void ext4_unlockfs(struct super_block *sb) 2943ac27a0ecSDave Kleikamp { 2944ac27a0ecSDave Kleikamp if (!(sb->s_flags & MS_RDONLY)) { 2945ac27a0ecSDave Kleikamp lock_super(sb); 2946ac27a0ecSDave Kleikamp /* Reser the needs_recovery flag before the fs is unlocked. */ 2947617ba13bSMingming Cao EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2948617ba13bSMingming Cao ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); 2949ac27a0ecSDave Kleikamp unlock_super(sb); 2950dab291afSMingming Cao jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 2951ac27a0ecSDave Kleikamp } 2952ac27a0ecSDave Kleikamp } 2953ac27a0ecSDave Kleikamp 2954617ba13bSMingming Cao static int ext4_remount(struct super_block *sb, int *flags, char *data) 2955ac27a0ecSDave Kleikamp { 2956617ba13bSMingming Cao struct ext4_super_block *es; 2957617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 2958617ba13bSMingming Cao ext4_fsblk_t n_blocks_count = 0; 2959ac27a0ecSDave Kleikamp unsigned long old_sb_flags; 2960617ba13bSMingming Cao struct ext4_mount_options old_opts; 29618a266467STheodore Ts'o ext4_group_t g; 2962ac27a0ecSDave Kleikamp int err; 2963ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 2964ac27a0ecSDave Kleikamp int i; 2965ac27a0ecSDave Kleikamp #endif 2966ac27a0ecSDave Kleikamp 2967ac27a0ecSDave Kleikamp /* Store the original options */ 2968ac27a0ecSDave Kleikamp old_sb_flags = sb->s_flags; 2969ac27a0ecSDave Kleikamp old_opts.s_mount_opt = sbi->s_mount_opt; 2970ac27a0ecSDave Kleikamp old_opts.s_resuid = sbi->s_resuid; 2971ac27a0ecSDave Kleikamp old_opts.s_resgid = sbi->s_resgid; 2972ac27a0ecSDave Kleikamp old_opts.s_commit_interval = sbi->s_commit_interval; 2973ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 2974ac27a0ecSDave Kleikamp old_opts.s_jquota_fmt = sbi->s_jquota_fmt; 2975ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) 2976ac27a0ecSDave Kleikamp old_opts.s_qf_names[i] = sbi->s_qf_names[i]; 2977ac27a0ecSDave Kleikamp #endif 2978ac27a0ecSDave Kleikamp 2979ac27a0ecSDave Kleikamp /* 2980ac27a0ecSDave Kleikamp * Allow the "check" option to be passed as a remount option. 2981ac27a0ecSDave Kleikamp */ 2982ac27a0ecSDave Kleikamp if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) { 2983ac27a0ecSDave Kleikamp err = -EINVAL; 2984ac27a0ecSDave Kleikamp goto restore_opts; 2985ac27a0ecSDave Kleikamp } 2986ac27a0ecSDave Kleikamp 2987617ba13bSMingming Cao if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) 298846e665e9SHarvey Harrison ext4_abort(sb, __func__, "Abort forced by user"); 2989ac27a0ecSDave Kleikamp 2990ac27a0ecSDave Kleikamp sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 2991617ba13bSMingming Cao ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 2992ac27a0ecSDave Kleikamp 2993ac27a0ecSDave Kleikamp es = sbi->s_es; 2994ac27a0ecSDave Kleikamp 2995617ba13bSMingming Cao ext4_init_journal_params(sb, sbi->s_journal); 2996ac27a0ecSDave Kleikamp 2997ac27a0ecSDave Kleikamp if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || 2998bd81d8eeSLaurent Vivier n_blocks_count > ext4_blocks_count(es)) { 2999617ba13bSMingming Cao if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) { 3000ac27a0ecSDave Kleikamp err = -EROFS; 3001ac27a0ecSDave Kleikamp goto restore_opts; 3002ac27a0ecSDave Kleikamp } 3003ac27a0ecSDave Kleikamp 3004ac27a0ecSDave Kleikamp if (*flags & MS_RDONLY) { 3005ac27a0ecSDave Kleikamp /* 3006ac27a0ecSDave Kleikamp * First of all, the unconditional stuff we have to do 3007ac27a0ecSDave Kleikamp * to disable replay of the journal when we next remount 3008ac27a0ecSDave Kleikamp */ 3009ac27a0ecSDave Kleikamp sb->s_flags |= MS_RDONLY; 3010ac27a0ecSDave Kleikamp 3011ac27a0ecSDave Kleikamp /* 3012ac27a0ecSDave Kleikamp * OK, test if we are remounting a valid rw partition 3013ac27a0ecSDave Kleikamp * readonly, and if so set the rdonly flag and then 3014ac27a0ecSDave Kleikamp * mark the partition as valid again. 3015ac27a0ecSDave Kleikamp */ 3016617ba13bSMingming Cao if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && 3017617ba13bSMingming Cao (sbi->s_mount_state & EXT4_VALID_FS)) 3018ac27a0ecSDave Kleikamp es->s_state = cpu_to_le16(sbi->s_mount_state); 3019ac27a0ecSDave Kleikamp 302032c37730SJan Kara /* 302132c37730SJan Kara * We have to unlock super so that we can wait for 302232c37730SJan Kara * transactions. 302332c37730SJan Kara */ 302432c37730SJan Kara unlock_super(sb); 3025617ba13bSMingming Cao ext4_mark_recovery_complete(sb, es); 302632c37730SJan Kara lock_super(sb); 3027ac27a0ecSDave Kleikamp } else { 3028ac27a0ecSDave Kleikamp __le32 ret; 3029617ba13bSMingming Cao if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb, 3030617ba13bSMingming Cao ~EXT4_FEATURE_RO_COMPAT_SUPP))) { 3031617ba13bSMingming Cao printk(KERN_WARNING "EXT4-fs: %s: couldn't " 3032ac27a0ecSDave Kleikamp "remount RDWR because of unsupported " 3033ac27a0ecSDave Kleikamp "optional features (%x).\n", 3034ac27a0ecSDave Kleikamp sb->s_id, le32_to_cpu(ret)); 3035ac27a0ecSDave Kleikamp err = -EROFS; 3036ac27a0ecSDave Kleikamp goto restore_opts; 3037ac27a0ecSDave Kleikamp } 3038ead6596bSEric Sandeen 3039ead6596bSEric Sandeen /* 30408a266467STheodore Ts'o * Make sure the group descriptor checksums 30418a266467STheodore Ts'o * are sane. If they aren't, refuse to 30428a266467STheodore Ts'o * remount r/w. 30438a266467STheodore Ts'o */ 30448a266467STheodore Ts'o for (g = 0; g < sbi->s_groups_count; g++) { 30458a266467STheodore Ts'o struct ext4_group_desc *gdp = 30468a266467STheodore Ts'o ext4_get_group_desc(sb, g, NULL); 30478a266467STheodore Ts'o 30488a266467STheodore Ts'o if (!ext4_group_desc_csum_verify(sbi, g, gdp)) { 30498a266467STheodore Ts'o printk(KERN_ERR 30508a266467STheodore Ts'o "EXT4-fs: ext4_remount: " 30518a266467STheodore Ts'o "Checksum for group %lu failed (%u!=%u)\n", 30528a266467STheodore Ts'o g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)), 30538a266467STheodore Ts'o le16_to_cpu(gdp->bg_checksum)); 30548a266467STheodore Ts'o err = -EINVAL; 30558a266467STheodore Ts'o goto restore_opts; 30568a266467STheodore Ts'o } 30578a266467STheodore Ts'o } 30588a266467STheodore Ts'o 30598a266467STheodore Ts'o /* 3060ead6596bSEric Sandeen * If we have an unprocessed orphan list hanging 3061ead6596bSEric Sandeen * around from a previously readonly bdev mount, 3062ead6596bSEric Sandeen * require a full umount/remount for now. 3063ead6596bSEric Sandeen */ 3064ead6596bSEric Sandeen if (es->s_last_orphan) { 3065ead6596bSEric Sandeen printk(KERN_WARNING "EXT4-fs: %s: couldn't " 3066ead6596bSEric Sandeen "remount RDWR because of unprocessed " 3067ead6596bSEric Sandeen "orphan inode list. Please " 3068ead6596bSEric Sandeen "umount/remount instead.\n", 3069ead6596bSEric Sandeen sb->s_id); 3070ead6596bSEric Sandeen err = -EINVAL; 3071ead6596bSEric Sandeen goto restore_opts; 3072ead6596bSEric Sandeen } 3073ead6596bSEric Sandeen 3074ac27a0ecSDave Kleikamp /* 3075ac27a0ecSDave Kleikamp * Mounting a RDONLY partition read-write, so reread 3076ac27a0ecSDave Kleikamp * and store the current valid flag. (It may have 3077ac27a0ecSDave Kleikamp * been changed by e2fsck since we originally mounted 3078ac27a0ecSDave Kleikamp * the partition.) 3079ac27a0ecSDave Kleikamp */ 3080617ba13bSMingming Cao ext4_clear_journal_err(sb, es); 3081ac27a0ecSDave Kleikamp sbi->s_mount_state = le16_to_cpu(es->s_state); 3082617ba13bSMingming Cao if ((err = ext4_group_extend(sb, es, n_blocks_count))) 3083ac27a0ecSDave Kleikamp goto restore_opts; 3084617ba13bSMingming Cao if (!ext4_setup_super(sb, es, 0)) 3085ac27a0ecSDave Kleikamp sb->s_flags &= ~MS_RDONLY; 3086ac27a0ecSDave Kleikamp } 3087ac27a0ecSDave Kleikamp } 3088ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 3089ac27a0ecSDave Kleikamp /* Release old quota file names */ 3090ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) 3091ac27a0ecSDave Kleikamp if (old_opts.s_qf_names[i] && 3092ac27a0ecSDave Kleikamp old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 3093ac27a0ecSDave Kleikamp kfree(old_opts.s_qf_names[i]); 3094ac27a0ecSDave Kleikamp #endif 3095ac27a0ecSDave Kleikamp return 0; 3096ac27a0ecSDave Kleikamp restore_opts: 3097ac27a0ecSDave Kleikamp sb->s_flags = old_sb_flags; 3098ac27a0ecSDave Kleikamp sbi->s_mount_opt = old_opts.s_mount_opt; 3099ac27a0ecSDave Kleikamp sbi->s_resuid = old_opts.s_resuid; 3100ac27a0ecSDave Kleikamp sbi->s_resgid = old_opts.s_resgid; 3101ac27a0ecSDave Kleikamp sbi->s_commit_interval = old_opts.s_commit_interval; 3102ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 3103ac27a0ecSDave Kleikamp sbi->s_jquota_fmt = old_opts.s_jquota_fmt; 3104ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) { 3105ac27a0ecSDave Kleikamp if (sbi->s_qf_names[i] && 3106ac27a0ecSDave Kleikamp old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 3107ac27a0ecSDave Kleikamp kfree(sbi->s_qf_names[i]); 3108ac27a0ecSDave Kleikamp sbi->s_qf_names[i] = old_opts.s_qf_names[i]; 3109ac27a0ecSDave Kleikamp } 3110ac27a0ecSDave Kleikamp #endif 3111ac27a0ecSDave Kleikamp return err; 3112ac27a0ecSDave Kleikamp } 3113ac27a0ecSDave Kleikamp 3114617ba13bSMingming Cao static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf) 3115ac27a0ecSDave Kleikamp { 3116ac27a0ecSDave Kleikamp struct super_block *sb = dentry->d_sb; 3117617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 3118617ba13bSMingming Cao struct ext4_super_block *es = sbi->s_es; 3119960cc398SPekka Enberg u64 fsid; 3120ac27a0ecSDave Kleikamp 31215e70030dSBadari Pulavarty if (test_opt(sb, MINIX_DF)) { 31225e70030dSBadari Pulavarty sbi->s_overhead_last = 0; 31236bc9feffSAneesh Kumar K.V } else if (sbi->s_blocks_last != ext4_blocks_count(es)) { 3124fd2d4291SAvantika Mathur ext4_group_t ngroups = sbi->s_groups_count, i; 31255e70030dSBadari Pulavarty ext4_fsblk_t overhead = 0; 3126ac27a0ecSDave Kleikamp smp_rmb(); 3127ac27a0ecSDave Kleikamp 3128ac27a0ecSDave Kleikamp /* 31295e70030dSBadari Pulavarty * Compute the overhead (FS structures). This is constant 31305e70030dSBadari Pulavarty * for a given filesystem unless the number of block groups 31315e70030dSBadari Pulavarty * changes so we cache the previous value until it does. 3132ac27a0ecSDave Kleikamp */ 3133ac27a0ecSDave Kleikamp 3134ac27a0ecSDave Kleikamp /* 3135ac27a0ecSDave Kleikamp * All of the blocks before first_data_block are 3136ac27a0ecSDave Kleikamp * overhead 3137ac27a0ecSDave Kleikamp */ 3138ac27a0ecSDave Kleikamp overhead = le32_to_cpu(es->s_first_data_block); 3139ac27a0ecSDave Kleikamp 3140ac27a0ecSDave Kleikamp /* 3141ac27a0ecSDave Kleikamp * Add the overhead attributed to the superblock and 3142ac27a0ecSDave Kleikamp * block group descriptors. If the sparse superblocks 3143ac27a0ecSDave Kleikamp * feature is turned on, then not all groups have this. 3144ac27a0ecSDave Kleikamp */ 3145ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 3146617ba13bSMingming Cao overhead += ext4_bg_has_super(sb, i) + 3147617ba13bSMingming Cao ext4_bg_num_gdb(sb, i); 3148ac27a0ecSDave Kleikamp cond_resched(); 3149ac27a0ecSDave Kleikamp } 3150ac27a0ecSDave Kleikamp 3151ac27a0ecSDave Kleikamp /* 3152ac27a0ecSDave Kleikamp * Every block group has an inode bitmap, a block 3153ac27a0ecSDave Kleikamp * bitmap, and an inode table. 3154ac27a0ecSDave Kleikamp */ 31555e70030dSBadari Pulavarty overhead += ngroups * (2 + sbi->s_itb_per_group); 31565e70030dSBadari Pulavarty sbi->s_overhead_last = overhead; 31575e70030dSBadari Pulavarty smp_wmb(); 31586bc9feffSAneesh Kumar K.V sbi->s_blocks_last = ext4_blocks_count(es); 3159ac27a0ecSDave Kleikamp } 3160ac27a0ecSDave Kleikamp 3161617ba13bSMingming Cao buf->f_type = EXT4_SUPER_MAGIC; 3162ac27a0ecSDave Kleikamp buf->f_bsize = sb->s_blocksize; 31635e70030dSBadari Pulavarty buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last; 316452d9f3b4SPeter Zijlstra buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter); 3165308ba3ecSAneesh Kumar K.V ext4_free_blocks_count_set(es, buf->f_bfree); 3166bd81d8eeSLaurent Vivier buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); 3167bd81d8eeSLaurent Vivier if (buf->f_bfree < ext4_r_blocks_count(es)) 3168ac27a0ecSDave Kleikamp buf->f_bavail = 0; 3169ac27a0ecSDave Kleikamp buf->f_files = le32_to_cpu(es->s_inodes_count); 317052d9f3b4SPeter Zijlstra buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); 31715e70030dSBadari Pulavarty es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); 3172617ba13bSMingming Cao buf->f_namelen = EXT4_NAME_LEN; 3173960cc398SPekka Enberg fsid = le64_to_cpup((void *)es->s_uuid) ^ 3174960cc398SPekka Enberg le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 3175960cc398SPekka Enberg buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 3176960cc398SPekka Enberg buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 3177ac27a0ecSDave Kleikamp return 0; 3178ac27a0ecSDave Kleikamp } 3179ac27a0ecSDave Kleikamp 3180ac27a0ecSDave Kleikamp /* Helper function for writing quotas on sync - we need to start transaction before quota file 3181ac27a0ecSDave Kleikamp * is locked for write. Otherwise the are possible deadlocks: 3182ac27a0ecSDave Kleikamp * Process 1 Process 2 3183617ba13bSMingming Cao * ext4_create() quota_sync() 3184dab291afSMingming Cao * jbd2_journal_start() write_dquot() 3185ac27a0ecSDave Kleikamp * DQUOT_INIT() down(dqio_mutex) 3186dab291afSMingming Cao * down(dqio_mutex) jbd2_journal_start() 3187ac27a0ecSDave Kleikamp * 3188ac27a0ecSDave Kleikamp */ 3189ac27a0ecSDave Kleikamp 3190ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 3191ac27a0ecSDave Kleikamp 3192ac27a0ecSDave Kleikamp static inline struct inode *dquot_to_inode(struct dquot *dquot) 3193ac27a0ecSDave Kleikamp { 3194ac27a0ecSDave Kleikamp return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; 3195ac27a0ecSDave Kleikamp } 3196ac27a0ecSDave Kleikamp 3197617ba13bSMingming Cao static int ext4_dquot_initialize(struct inode *inode, int type) 3198ac27a0ecSDave Kleikamp { 3199ac27a0ecSDave Kleikamp handle_t *handle; 3200ac27a0ecSDave Kleikamp int ret, err; 3201ac27a0ecSDave Kleikamp 3202ac27a0ecSDave Kleikamp /* We may create quota structure so we need to reserve enough blocks */ 3203617ba13bSMingming Cao handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb)); 3204ac27a0ecSDave Kleikamp if (IS_ERR(handle)) 3205ac27a0ecSDave Kleikamp return PTR_ERR(handle); 3206ac27a0ecSDave Kleikamp ret = dquot_initialize(inode, type); 3207617ba13bSMingming Cao err = ext4_journal_stop(handle); 3208ac27a0ecSDave Kleikamp if (!ret) 3209ac27a0ecSDave Kleikamp ret = err; 3210ac27a0ecSDave Kleikamp return ret; 3211ac27a0ecSDave Kleikamp } 3212ac27a0ecSDave Kleikamp 3213617ba13bSMingming Cao static int ext4_dquot_drop(struct inode *inode) 3214ac27a0ecSDave Kleikamp { 3215ac27a0ecSDave Kleikamp handle_t *handle; 3216ac27a0ecSDave Kleikamp int ret, err; 3217ac27a0ecSDave Kleikamp 3218ac27a0ecSDave Kleikamp /* We may delete quota structure so we need to reserve enough blocks */ 3219617ba13bSMingming Cao handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb)); 32202887df13SJan Kara if (IS_ERR(handle)) { 32212887df13SJan Kara /* 32222887df13SJan Kara * We call dquot_drop() anyway to at least release references 32232887df13SJan Kara * to quota structures so that umount does not hang. 32242887df13SJan Kara */ 32252887df13SJan Kara dquot_drop(inode); 3226ac27a0ecSDave Kleikamp return PTR_ERR(handle); 32272887df13SJan Kara } 3228ac27a0ecSDave Kleikamp ret = dquot_drop(inode); 3229617ba13bSMingming Cao err = ext4_journal_stop(handle); 3230ac27a0ecSDave Kleikamp if (!ret) 3231ac27a0ecSDave Kleikamp ret = err; 3232ac27a0ecSDave Kleikamp return ret; 3233ac27a0ecSDave Kleikamp } 3234ac27a0ecSDave Kleikamp 3235617ba13bSMingming Cao static int ext4_write_dquot(struct dquot *dquot) 3236ac27a0ecSDave Kleikamp { 3237ac27a0ecSDave Kleikamp int ret, err; 3238ac27a0ecSDave Kleikamp handle_t *handle; 3239ac27a0ecSDave Kleikamp struct inode *inode; 3240ac27a0ecSDave Kleikamp 3241ac27a0ecSDave Kleikamp inode = dquot_to_inode(dquot); 3242617ba13bSMingming Cao handle = ext4_journal_start(inode, 3243617ba13bSMingming Cao EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 3244ac27a0ecSDave Kleikamp if (IS_ERR(handle)) 3245ac27a0ecSDave Kleikamp return PTR_ERR(handle); 3246ac27a0ecSDave Kleikamp ret = dquot_commit(dquot); 3247617ba13bSMingming Cao err = ext4_journal_stop(handle); 3248ac27a0ecSDave Kleikamp if (!ret) 3249ac27a0ecSDave Kleikamp ret = err; 3250ac27a0ecSDave Kleikamp return ret; 3251ac27a0ecSDave Kleikamp } 3252ac27a0ecSDave Kleikamp 3253617ba13bSMingming Cao static int ext4_acquire_dquot(struct dquot *dquot) 3254ac27a0ecSDave Kleikamp { 3255ac27a0ecSDave Kleikamp int ret, err; 3256ac27a0ecSDave Kleikamp handle_t *handle; 3257ac27a0ecSDave Kleikamp 3258617ba13bSMingming Cao handle = ext4_journal_start(dquot_to_inode(dquot), 3259617ba13bSMingming Cao EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 3260ac27a0ecSDave Kleikamp if (IS_ERR(handle)) 3261ac27a0ecSDave Kleikamp return PTR_ERR(handle); 3262ac27a0ecSDave Kleikamp ret = dquot_acquire(dquot); 3263617ba13bSMingming Cao err = ext4_journal_stop(handle); 3264ac27a0ecSDave Kleikamp if (!ret) 3265ac27a0ecSDave Kleikamp ret = err; 3266ac27a0ecSDave Kleikamp return ret; 3267ac27a0ecSDave Kleikamp } 3268ac27a0ecSDave Kleikamp 3269617ba13bSMingming Cao static int ext4_release_dquot(struct dquot *dquot) 3270ac27a0ecSDave Kleikamp { 3271ac27a0ecSDave Kleikamp int ret, err; 3272ac27a0ecSDave Kleikamp handle_t *handle; 3273ac27a0ecSDave Kleikamp 3274617ba13bSMingming Cao handle = ext4_journal_start(dquot_to_inode(dquot), 3275617ba13bSMingming Cao EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 32769c3013e9SJan Kara if (IS_ERR(handle)) { 32779c3013e9SJan Kara /* Release dquot anyway to avoid endless cycle in dqput() */ 32789c3013e9SJan Kara dquot_release(dquot); 3279ac27a0ecSDave Kleikamp return PTR_ERR(handle); 32809c3013e9SJan Kara } 3281ac27a0ecSDave Kleikamp ret = dquot_release(dquot); 3282617ba13bSMingming Cao err = ext4_journal_stop(handle); 3283ac27a0ecSDave Kleikamp if (!ret) 3284ac27a0ecSDave Kleikamp ret = err; 3285ac27a0ecSDave Kleikamp return ret; 3286ac27a0ecSDave Kleikamp } 3287ac27a0ecSDave Kleikamp 3288617ba13bSMingming Cao static int ext4_mark_dquot_dirty(struct dquot *dquot) 3289ac27a0ecSDave Kleikamp { 32902c8be6b2SJan Kara /* Are we journaling quotas? */ 3291617ba13bSMingming Cao if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || 3292617ba13bSMingming Cao EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { 3293ac27a0ecSDave Kleikamp dquot_mark_dquot_dirty(dquot); 3294617ba13bSMingming Cao return ext4_write_dquot(dquot); 3295ac27a0ecSDave Kleikamp } else { 3296ac27a0ecSDave Kleikamp return dquot_mark_dquot_dirty(dquot); 3297ac27a0ecSDave Kleikamp } 3298ac27a0ecSDave Kleikamp } 3299ac27a0ecSDave Kleikamp 3300617ba13bSMingming Cao static int ext4_write_info(struct super_block *sb, int type) 3301ac27a0ecSDave Kleikamp { 3302ac27a0ecSDave Kleikamp int ret, err; 3303ac27a0ecSDave Kleikamp handle_t *handle; 3304ac27a0ecSDave Kleikamp 3305ac27a0ecSDave Kleikamp /* Data block + inode block */ 3306617ba13bSMingming Cao handle = ext4_journal_start(sb->s_root->d_inode, 2); 3307ac27a0ecSDave Kleikamp if (IS_ERR(handle)) 3308ac27a0ecSDave Kleikamp return PTR_ERR(handle); 3309ac27a0ecSDave Kleikamp ret = dquot_commit_info(sb, type); 3310617ba13bSMingming Cao err = ext4_journal_stop(handle); 3311ac27a0ecSDave Kleikamp if (!ret) 3312ac27a0ecSDave Kleikamp ret = err; 3313ac27a0ecSDave Kleikamp return ret; 3314ac27a0ecSDave Kleikamp } 3315ac27a0ecSDave Kleikamp 3316ac27a0ecSDave Kleikamp /* 3317ac27a0ecSDave Kleikamp * Turn on quotas during mount time - we need to find 3318ac27a0ecSDave Kleikamp * the quota file and such... 3319ac27a0ecSDave Kleikamp */ 3320617ba13bSMingming Cao static int ext4_quota_on_mount(struct super_block *sb, int type) 3321ac27a0ecSDave Kleikamp { 3322617ba13bSMingming Cao return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], 3323617ba13bSMingming Cao EXT4_SB(sb)->s_jquota_fmt, type); 3324ac27a0ecSDave Kleikamp } 3325ac27a0ecSDave Kleikamp 3326ac27a0ecSDave Kleikamp /* 3327ac27a0ecSDave Kleikamp * Standard function to be called on quota_on 3328ac27a0ecSDave Kleikamp */ 3329617ba13bSMingming Cao static int ext4_quota_on(struct super_block *sb, int type, int format_id, 33306f28e087SJan Kara char *path, int remount) 3331ac27a0ecSDave Kleikamp { 3332ac27a0ecSDave Kleikamp int err; 3333ac27a0ecSDave Kleikamp struct nameidata nd; 3334ac27a0ecSDave Kleikamp 3335ac27a0ecSDave Kleikamp if (!test_opt(sb, QUOTA)) 3336ac27a0ecSDave Kleikamp return -EINVAL; 33370623543bSJan Kara /* When remounting, no checks are needed and in fact, path is NULL */ 33380623543bSJan Kara if (remount) 33396f28e087SJan Kara return vfs_quota_on(sb, type, format_id, path, remount); 33400623543bSJan Kara 3341ac27a0ecSDave Kleikamp err = path_lookup(path, LOOKUP_FOLLOW, &nd); 3342ac27a0ecSDave Kleikamp if (err) 3343ac27a0ecSDave Kleikamp return err; 33440623543bSJan Kara 3345ac27a0ecSDave Kleikamp /* Quotafile not on the same filesystem? */ 33464ac91378SJan Blunck if (nd.path.mnt->mnt_sb != sb) { 33471d957f9bSJan Blunck path_put(&nd.path); 3348ac27a0ecSDave Kleikamp return -EXDEV; 3349ac27a0ecSDave Kleikamp } 33500623543bSJan Kara /* Journaling quota? */ 33510623543bSJan Kara if (EXT4_SB(sb)->s_qf_names[type]) { 3352*2b2d6d01STheodore Ts'o /* Quotafile not in fs root? */ 33534ac91378SJan Blunck if (nd.path.dentry->d_parent->d_inode != sb->s_root->d_inode) 3354ac27a0ecSDave Kleikamp printk(KERN_WARNING 3355617ba13bSMingming Cao "EXT4-fs: Quota file not on filesystem root. " 33560623543bSJan Kara "Journaled quota will not work.\n"); 33570623543bSJan Kara } 33580623543bSJan Kara 33590623543bSJan Kara /* 33600623543bSJan Kara * When we journal data on quota file, we have to flush journal to see 33610623543bSJan Kara * all updates to the file when we bypass pagecache... 33620623543bSJan Kara */ 33630623543bSJan Kara if (ext4_should_journal_data(nd.path.dentry->d_inode)) { 33640623543bSJan Kara /* 33650623543bSJan Kara * We don't need to lock updates but journal_flush() could 33660623543bSJan Kara * otherwise be livelocked... 33670623543bSJan Kara */ 33680623543bSJan Kara jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 33690623543bSJan Kara jbd2_journal_flush(EXT4_SB(sb)->s_journal); 33700623543bSJan Kara jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 33710623543bSJan Kara } 33720623543bSJan Kara 33731d957f9bSJan Blunck path_put(&nd.path); 33746f28e087SJan Kara return vfs_quota_on(sb, type, format_id, path, remount); 3375ac27a0ecSDave Kleikamp } 3376ac27a0ecSDave Kleikamp 3377ac27a0ecSDave Kleikamp /* Read data from quotafile - avoid pagecache and such because we cannot afford 3378ac27a0ecSDave Kleikamp * acquiring the locks... As quota files are never truncated and quota code 3379ac27a0ecSDave Kleikamp * itself serializes the operations (and noone else should touch the files) 3380ac27a0ecSDave Kleikamp * we don't have to be afraid of races */ 3381617ba13bSMingming Cao static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 3382ac27a0ecSDave Kleikamp size_t len, loff_t off) 3383ac27a0ecSDave Kleikamp { 3384ac27a0ecSDave Kleikamp struct inode *inode = sb_dqopt(sb)->files[type]; 3385725d26d3SAneesh Kumar K.V ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 3386ac27a0ecSDave Kleikamp int err = 0; 3387ac27a0ecSDave Kleikamp int offset = off & (sb->s_blocksize - 1); 3388ac27a0ecSDave Kleikamp int tocopy; 3389ac27a0ecSDave Kleikamp size_t toread; 3390ac27a0ecSDave Kleikamp struct buffer_head *bh; 3391ac27a0ecSDave Kleikamp loff_t i_size = i_size_read(inode); 3392ac27a0ecSDave Kleikamp 3393ac27a0ecSDave Kleikamp if (off > i_size) 3394ac27a0ecSDave Kleikamp return 0; 3395ac27a0ecSDave Kleikamp if (off+len > i_size) 3396ac27a0ecSDave Kleikamp len = i_size-off; 3397ac27a0ecSDave Kleikamp toread = len; 3398ac27a0ecSDave Kleikamp while (toread > 0) { 3399ac27a0ecSDave Kleikamp tocopy = sb->s_blocksize - offset < toread ? 3400ac27a0ecSDave Kleikamp sb->s_blocksize - offset : toread; 3401617ba13bSMingming Cao bh = ext4_bread(NULL, inode, blk, 0, &err); 3402ac27a0ecSDave Kleikamp if (err) 3403ac27a0ecSDave Kleikamp return err; 3404ac27a0ecSDave Kleikamp if (!bh) /* A hole? */ 3405ac27a0ecSDave Kleikamp memset(data, 0, tocopy); 3406ac27a0ecSDave Kleikamp else 3407ac27a0ecSDave Kleikamp memcpy(data, bh->b_data+offset, tocopy); 3408ac27a0ecSDave Kleikamp brelse(bh); 3409ac27a0ecSDave Kleikamp offset = 0; 3410ac27a0ecSDave Kleikamp toread -= tocopy; 3411ac27a0ecSDave Kleikamp data += tocopy; 3412ac27a0ecSDave Kleikamp blk++; 3413ac27a0ecSDave Kleikamp } 3414ac27a0ecSDave Kleikamp return len; 3415ac27a0ecSDave Kleikamp } 3416ac27a0ecSDave Kleikamp 3417ac27a0ecSDave Kleikamp /* Write to quotafile (we know the transaction is already started and has 3418ac27a0ecSDave Kleikamp * enough credits) */ 3419617ba13bSMingming Cao static ssize_t ext4_quota_write(struct super_block *sb, int type, 3420ac27a0ecSDave Kleikamp const char *data, size_t len, loff_t off) 3421ac27a0ecSDave Kleikamp { 3422ac27a0ecSDave Kleikamp struct inode *inode = sb_dqopt(sb)->files[type]; 3423725d26d3SAneesh Kumar K.V ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 3424ac27a0ecSDave Kleikamp int err = 0; 3425ac27a0ecSDave Kleikamp int offset = off & (sb->s_blocksize - 1); 3426ac27a0ecSDave Kleikamp int tocopy; 3427617ba13bSMingming Cao int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL; 3428ac27a0ecSDave Kleikamp size_t towrite = len; 3429ac27a0ecSDave Kleikamp struct buffer_head *bh; 3430ac27a0ecSDave Kleikamp handle_t *handle = journal_current_handle(); 3431ac27a0ecSDave Kleikamp 34329c3013e9SJan Kara if (!handle) { 34339c3013e9SJan Kara printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)" 34349c3013e9SJan Kara " cancelled because transaction is not started.\n", 34359c3013e9SJan Kara (unsigned long long)off, (unsigned long long)len); 34369c3013e9SJan Kara return -EIO; 34379c3013e9SJan Kara } 3438ac27a0ecSDave Kleikamp mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 3439ac27a0ecSDave Kleikamp while (towrite > 0) { 3440ac27a0ecSDave Kleikamp tocopy = sb->s_blocksize - offset < towrite ? 3441ac27a0ecSDave Kleikamp sb->s_blocksize - offset : towrite; 3442617ba13bSMingming Cao bh = ext4_bread(handle, inode, blk, 1, &err); 3443ac27a0ecSDave Kleikamp if (!bh) 3444ac27a0ecSDave Kleikamp goto out; 3445ac27a0ecSDave Kleikamp if (journal_quota) { 3446617ba13bSMingming Cao err = ext4_journal_get_write_access(handle, bh); 3447ac27a0ecSDave Kleikamp if (err) { 3448ac27a0ecSDave Kleikamp brelse(bh); 3449ac27a0ecSDave Kleikamp goto out; 3450ac27a0ecSDave Kleikamp } 3451ac27a0ecSDave Kleikamp } 3452ac27a0ecSDave Kleikamp lock_buffer(bh); 3453ac27a0ecSDave Kleikamp memcpy(bh->b_data+offset, data, tocopy); 3454ac27a0ecSDave Kleikamp flush_dcache_page(bh->b_page); 3455ac27a0ecSDave Kleikamp unlock_buffer(bh); 3456ac27a0ecSDave Kleikamp if (journal_quota) 3457617ba13bSMingming Cao err = ext4_journal_dirty_metadata(handle, bh); 3458ac27a0ecSDave Kleikamp else { 3459ac27a0ecSDave Kleikamp /* Always do at least ordered writes for quotas */ 3460678aaf48SJan Kara err = ext4_jbd2_file_inode(handle, inode); 3461ac27a0ecSDave Kleikamp mark_buffer_dirty(bh); 3462ac27a0ecSDave Kleikamp } 3463ac27a0ecSDave Kleikamp brelse(bh); 3464ac27a0ecSDave Kleikamp if (err) 3465ac27a0ecSDave Kleikamp goto out; 3466ac27a0ecSDave Kleikamp offset = 0; 3467ac27a0ecSDave Kleikamp towrite -= tocopy; 3468ac27a0ecSDave Kleikamp data += tocopy; 3469ac27a0ecSDave Kleikamp blk++; 3470ac27a0ecSDave Kleikamp } 3471ac27a0ecSDave Kleikamp out: 34724d04e4fbSJan Kara if (len == towrite) { 34734d04e4fbSJan Kara mutex_unlock(&inode->i_mutex); 3474ac27a0ecSDave Kleikamp return err; 34754d04e4fbSJan Kara } 3476ac27a0ecSDave Kleikamp if (inode->i_size < off+len-towrite) { 3477ac27a0ecSDave Kleikamp i_size_write(inode, off+len-towrite); 3478617ba13bSMingming Cao EXT4_I(inode)->i_disksize = inode->i_size; 3479ac27a0ecSDave Kleikamp } 3480ac27a0ecSDave Kleikamp inode->i_mtime = inode->i_ctime = CURRENT_TIME; 3481617ba13bSMingming Cao ext4_mark_inode_dirty(handle, inode); 3482ac27a0ecSDave Kleikamp mutex_unlock(&inode->i_mutex); 3483ac27a0ecSDave Kleikamp return len - towrite; 3484ac27a0ecSDave Kleikamp } 3485ac27a0ecSDave Kleikamp 3486ac27a0ecSDave Kleikamp #endif 3487ac27a0ecSDave Kleikamp 3488617ba13bSMingming Cao static int ext4_get_sb(struct file_system_type *fs_type, 3489ac27a0ecSDave Kleikamp int flags, const char *dev_name, void *data, struct vfsmount *mnt) 3490ac27a0ecSDave Kleikamp { 3491617ba13bSMingming Cao return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt); 3492ac27a0ecSDave Kleikamp } 3493ac27a0ecSDave Kleikamp 3494617ba13bSMingming Cao static struct file_system_type ext4dev_fs_type = { 3495ac27a0ecSDave Kleikamp .owner = THIS_MODULE, 3496617ba13bSMingming Cao .name = "ext4dev", 3497617ba13bSMingming Cao .get_sb = ext4_get_sb, 3498ac27a0ecSDave Kleikamp .kill_sb = kill_block_super, 3499ac27a0ecSDave Kleikamp .fs_flags = FS_REQUIRES_DEV, 3500ac27a0ecSDave Kleikamp }; 3501ac27a0ecSDave Kleikamp 3502617ba13bSMingming Cao static int __init init_ext4_fs(void) 3503ac27a0ecSDave Kleikamp { 3504c9de560dSAlex Tomas int err; 3505c9de560dSAlex Tomas 3506c9de560dSAlex Tomas err = init_ext4_mballoc(); 3507ac27a0ecSDave Kleikamp if (err) 3508ac27a0ecSDave Kleikamp return err; 3509c9de560dSAlex Tomas 3510c9de560dSAlex Tomas err = init_ext4_xattr(); 3511c9de560dSAlex Tomas if (err) 3512c9de560dSAlex Tomas goto out2; 3513ac27a0ecSDave Kleikamp err = init_inodecache(); 3514ac27a0ecSDave Kleikamp if (err) 3515ac27a0ecSDave Kleikamp goto out1; 3516617ba13bSMingming Cao err = register_filesystem(&ext4dev_fs_type); 3517ac27a0ecSDave Kleikamp if (err) 3518ac27a0ecSDave Kleikamp goto out; 3519ac27a0ecSDave Kleikamp return 0; 3520ac27a0ecSDave Kleikamp out: 3521ac27a0ecSDave Kleikamp destroy_inodecache(); 3522ac27a0ecSDave Kleikamp out1: 3523617ba13bSMingming Cao exit_ext4_xattr(); 3524c9de560dSAlex Tomas out2: 3525c9de560dSAlex Tomas exit_ext4_mballoc(); 3526ac27a0ecSDave Kleikamp return err; 3527ac27a0ecSDave Kleikamp } 3528ac27a0ecSDave Kleikamp 3529617ba13bSMingming Cao static void __exit exit_ext4_fs(void) 3530ac27a0ecSDave Kleikamp { 3531617ba13bSMingming Cao unregister_filesystem(&ext4dev_fs_type); 3532ac27a0ecSDave Kleikamp destroy_inodecache(); 3533617ba13bSMingming Cao exit_ext4_xattr(); 3534c9de560dSAlex Tomas exit_ext4_mballoc(); 3535ac27a0ecSDave Kleikamp } 3536ac27a0ecSDave Kleikamp 3537ac27a0ecSDave Kleikamp MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); 3538617ba13bSMingming Cao MODULE_DESCRIPTION("Fourth Extended Filesystem with extents"); 3539ac27a0ecSDave Kleikamp MODULE_LICENSE("GPL"); 3540617ba13bSMingming Cao module_init(init_ext4_fs) 3541617ba13bSMingming Cao module_exit(exit_ext4_fs) 3542