1ac27a0ecSDave Kleikamp /* 2617ba13bSMingming Cao * linux/fs/ext4/super.c 3ac27a0ecSDave Kleikamp * 4ac27a0ecSDave Kleikamp * Copyright (C) 1992, 1993, 1994, 1995 5ac27a0ecSDave Kleikamp * Remy Card (card@masi.ibp.fr) 6ac27a0ecSDave Kleikamp * Laboratoire MASI - Institut Blaise Pascal 7ac27a0ecSDave Kleikamp * Universite Pierre et Marie Curie (Paris VI) 8ac27a0ecSDave Kleikamp * 9ac27a0ecSDave Kleikamp * from 10ac27a0ecSDave Kleikamp * 11ac27a0ecSDave Kleikamp * linux/fs/minix/inode.c 12ac27a0ecSDave Kleikamp * 13ac27a0ecSDave Kleikamp * Copyright (C) 1991, 1992 Linus Torvalds 14ac27a0ecSDave Kleikamp * 15ac27a0ecSDave Kleikamp * Big-endian to little-endian byte-swapping/bitmaps by 16ac27a0ecSDave Kleikamp * David S. Miller (davem@caip.rutgers.edu), 1995 17ac27a0ecSDave Kleikamp */ 18ac27a0ecSDave Kleikamp 19ac27a0ecSDave Kleikamp #include <linux/module.h> 20ac27a0ecSDave Kleikamp #include <linux/string.h> 21ac27a0ecSDave Kleikamp #include <linux/fs.h> 22ac27a0ecSDave Kleikamp #include <linux/time.h> 23dab291afSMingming Cao #include <linux/jbd2.h> 24ac27a0ecSDave Kleikamp #include <linux/slab.h> 25ac27a0ecSDave Kleikamp #include <linux/init.h> 26ac27a0ecSDave Kleikamp #include <linux/blkdev.h> 27ac27a0ecSDave Kleikamp #include <linux/parser.h> 28ac27a0ecSDave Kleikamp #include <linux/smp_lock.h> 29ac27a0ecSDave Kleikamp #include <linux/buffer_head.h> 30a5694255SChristoph Hellwig #include <linux/exportfs.h> 31ac27a0ecSDave Kleikamp #include <linux/vfs.h> 32ac27a0ecSDave Kleikamp #include <linux/random.h> 33ac27a0ecSDave Kleikamp #include <linux/mount.h> 34ac27a0ecSDave Kleikamp #include <linux/namei.h> 35ac27a0ecSDave Kleikamp #include <linux/quotaops.h> 36ac27a0ecSDave Kleikamp #include <linux/seq_file.h> 379f6200bbSTheodore Ts'o #include <linux/proc_fs.h> 38ede86cc4STheodore Ts'o #include <linux/marker.h> 391330593eSVignesh Babu #include <linux/log2.h> 40717d50e4SAndreas Dilger #include <linux/crc16.h> 41ac27a0ecSDave Kleikamp #include <asm/uaccess.h> 42ac27a0ecSDave Kleikamp 433dcf5451SChristoph Hellwig #include "ext4.h" 443dcf5451SChristoph Hellwig #include "ext4_jbd2.h" 45ac27a0ecSDave Kleikamp #include "xattr.h" 46ac27a0ecSDave Kleikamp #include "acl.h" 47ac27a0ecSDave Kleikamp #include "namei.h" 48717d50e4SAndreas Dilger #include "group.h" 49ac27a0ecSDave Kleikamp 509f6200bbSTheodore Ts'o struct proc_dir_entry *ext4_proc_root; 519f6200bbSTheodore Ts'o 52617ba13bSMingming Cao static int ext4_load_journal(struct super_block *, struct ext4_super_block *, 53ac27a0ecSDave Kleikamp unsigned long journal_devnum); 54617ba13bSMingming Cao static int ext4_create_journal(struct super_block *, struct ext4_super_block *, 55ac27a0ecSDave Kleikamp unsigned int); 56617ba13bSMingming Cao static void ext4_commit_super(struct super_block *sb, 572b2d6d01STheodore Ts'o struct ext4_super_block *es, int sync); 58617ba13bSMingming Cao static void ext4_mark_recovery_complete(struct super_block *sb, 59617ba13bSMingming Cao struct ext4_super_block *es); 60617ba13bSMingming Cao static void ext4_clear_journal_err(struct super_block *sb, 61617ba13bSMingming Cao struct ext4_super_block *es); 62617ba13bSMingming Cao static int ext4_sync_fs(struct super_block *sb, int wait); 63617ba13bSMingming Cao static const char *ext4_decode_error(struct super_block *sb, int errno, 64ac27a0ecSDave Kleikamp char nbuf[16]); 65617ba13bSMingming Cao static int ext4_remount(struct super_block *sb, int *flags, char *data); 66617ba13bSMingming Cao static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf); 67617ba13bSMingming Cao static void ext4_unlockfs(struct super_block *sb); 68617ba13bSMingming Cao static void ext4_write_super(struct super_block *sb); 69617ba13bSMingming Cao static void ext4_write_super_lockfs(struct super_block *sb); 70ac27a0ecSDave Kleikamp 71bd81d8eeSLaurent Vivier 728fadc143SAlexandre Ratchov ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 738fadc143SAlexandre Ratchov struct ext4_group_desc *bg) 74bd81d8eeSLaurent Vivier { 753a14589cSAneesh Kumar K.V return le32_to_cpu(bg->bg_block_bitmap_lo) | 768fadc143SAlexandre Ratchov (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 778fadc143SAlexandre Ratchov (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); 78bd81d8eeSLaurent Vivier } 79bd81d8eeSLaurent Vivier 808fadc143SAlexandre Ratchov ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 818fadc143SAlexandre Ratchov struct ext4_group_desc *bg) 82bd81d8eeSLaurent Vivier { 835272f837SAneesh Kumar K.V return le32_to_cpu(bg->bg_inode_bitmap_lo) | 848fadc143SAlexandre Ratchov (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 858fadc143SAlexandre Ratchov (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); 86bd81d8eeSLaurent Vivier } 87bd81d8eeSLaurent Vivier 888fadc143SAlexandre Ratchov ext4_fsblk_t ext4_inode_table(struct super_block *sb, 898fadc143SAlexandre Ratchov struct ext4_group_desc *bg) 90bd81d8eeSLaurent Vivier { 915272f837SAneesh Kumar K.V return le32_to_cpu(bg->bg_inode_table_lo) | 928fadc143SAlexandre Ratchov (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 938fadc143SAlexandre Ratchov (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); 94bd81d8eeSLaurent Vivier } 95bd81d8eeSLaurent Vivier 968fadc143SAlexandre Ratchov void ext4_block_bitmap_set(struct super_block *sb, 978fadc143SAlexandre Ratchov struct ext4_group_desc *bg, ext4_fsblk_t blk) 98bd81d8eeSLaurent Vivier { 993a14589cSAneesh Kumar K.V bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); 1008fadc143SAlexandre Ratchov if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 1018fadc143SAlexandre Ratchov bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); 102bd81d8eeSLaurent Vivier } 103bd81d8eeSLaurent Vivier 1048fadc143SAlexandre Ratchov void ext4_inode_bitmap_set(struct super_block *sb, 1058fadc143SAlexandre Ratchov struct ext4_group_desc *bg, ext4_fsblk_t blk) 106bd81d8eeSLaurent Vivier { 1075272f837SAneesh Kumar K.V bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); 1088fadc143SAlexandre Ratchov if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 1098fadc143SAlexandre Ratchov bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); 110bd81d8eeSLaurent Vivier } 111bd81d8eeSLaurent Vivier 1128fadc143SAlexandre Ratchov void ext4_inode_table_set(struct super_block *sb, 1138fadc143SAlexandre Ratchov struct ext4_group_desc *bg, ext4_fsblk_t blk) 114bd81d8eeSLaurent Vivier { 1155272f837SAneesh Kumar K.V bg->bg_inode_table_lo = cpu_to_le32((u32)blk); 1168fadc143SAlexandre Ratchov if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 1178fadc143SAlexandre Ratchov bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); 118bd81d8eeSLaurent Vivier } 119bd81d8eeSLaurent Vivier 120ac27a0ecSDave Kleikamp /* 121dab291afSMingming Cao * Wrappers for jbd2_journal_start/end. 122ac27a0ecSDave Kleikamp * 123ac27a0ecSDave Kleikamp * The only special thing we need to do here is to make sure that all 124ac27a0ecSDave Kleikamp * journal_end calls result in the superblock being marked dirty, so 125ac27a0ecSDave Kleikamp * that sync() will call the filesystem's write_super callback if 126ac27a0ecSDave Kleikamp * appropriate. 127ac27a0ecSDave Kleikamp */ 128617ba13bSMingming Cao handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) 129ac27a0ecSDave Kleikamp { 130ac27a0ecSDave Kleikamp journal_t *journal; 131ac27a0ecSDave Kleikamp 132ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) 133ac27a0ecSDave Kleikamp return ERR_PTR(-EROFS); 134ac27a0ecSDave Kleikamp 135ac27a0ecSDave Kleikamp /* Special case here: if the journal has aborted behind our 136ac27a0ecSDave Kleikamp * backs (eg. EIO in the commit thread), then we still need to 137ac27a0ecSDave Kleikamp * take the FS itself readonly cleanly. */ 138617ba13bSMingming Cao journal = EXT4_SB(sb)->s_journal; 1390390131bSFrank Mayhar if (journal) { 140ac27a0ecSDave Kleikamp if (is_journal_aborted(journal)) { 14146e665e9SHarvey Harrison ext4_abort(sb, __func__, 142ac27a0ecSDave Kleikamp "Detected aborted journal"); 143ac27a0ecSDave Kleikamp return ERR_PTR(-EROFS); 144ac27a0ecSDave Kleikamp } 145dab291afSMingming Cao return jbd2_journal_start(journal, nblocks); 146ac27a0ecSDave Kleikamp } 1470390131bSFrank Mayhar /* 1480390131bSFrank Mayhar * We're not journaling, return the appropriate indication. 1490390131bSFrank Mayhar */ 1500390131bSFrank Mayhar current->journal_info = EXT4_NOJOURNAL_HANDLE; 1510390131bSFrank Mayhar return current->journal_info; 1520390131bSFrank Mayhar } 153ac27a0ecSDave Kleikamp 154ac27a0ecSDave Kleikamp /* 155ac27a0ecSDave Kleikamp * The only special thing we need to do here is to make sure that all 156dab291afSMingming Cao * jbd2_journal_stop calls result in the superblock being marked dirty, so 157ac27a0ecSDave Kleikamp * that sync() will call the filesystem's write_super callback if 158ac27a0ecSDave Kleikamp * appropriate. 159ac27a0ecSDave Kleikamp */ 160617ba13bSMingming Cao int __ext4_journal_stop(const char *where, handle_t *handle) 161ac27a0ecSDave Kleikamp { 162ac27a0ecSDave Kleikamp struct super_block *sb; 163ac27a0ecSDave Kleikamp int err; 164ac27a0ecSDave Kleikamp int rc; 165ac27a0ecSDave Kleikamp 1660390131bSFrank Mayhar if (!ext4_handle_valid(handle)) { 1670390131bSFrank Mayhar /* 1680390131bSFrank Mayhar * Do this here since we don't call jbd2_journal_stop() in 1690390131bSFrank Mayhar * no-journal mode. 1700390131bSFrank Mayhar */ 1710390131bSFrank Mayhar current->journal_info = NULL; 1720390131bSFrank Mayhar return 0; 1730390131bSFrank Mayhar } 174ac27a0ecSDave Kleikamp sb = handle->h_transaction->t_journal->j_private; 175ac27a0ecSDave Kleikamp err = handle->h_err; 176dab291afSMingming Cao rc = jbd2_journal_stop(handle); 177ac27a0ecSDave Kleikamp 178ac27a0ecSDave Kleikamp if (!err) 179ac27a0ecSDave Kleikamp err = rc; 180ac27a0ecSDave Kleikamp if (err) 181617ba13bSMingming Cao __ext4_std_error(sb, where, err); 182ac27a0ecSDave Kleikamp return err; 183ac27a0ecSDave Kleikamp } 184ac27a0ecSDave Kleikamp 185617ba13bSMingming Cao void ext4_journal_abort_handle(const char *caller, const char *err_fn, 186ac27a0ecSDave Kleikamp struct buffer_head *bh, handle_t *handle, int err) 187ac27a0ecSDave Kleikamp { 188ac27a0ecSDave Kleikamp char nbuf[16]; 189617ba13bSMingming Cao const char *errstr = ext4_decode_error(NULL, err, nbuf); 190ac27a0ecSDave Kleikamp 1910390131bSFrank Mayhar BUG_ON(!ext4_handle_valid(handle)); 1920390131bSFrank Mayhar 193ac27a0ecSDave Kleikamp if (bh) 194ac27a0ecSDave Kleikamp BUFFER_TRACE(bh, "abort"); 195ac27a0ecSDave Kleikamp 196ac27a0ecSDave Kleikamp if (!handle->h_err) 197ac27a0ecSDave Kleikamp handle->h_err = err; 198ac27a0ecSDave Kleikamp 199ac27a0ecSDave Kleikamp if (is_handle_aborted(handle)) 200ac27a0ecSDave Kleikamp return; 201ac27a0ecSDave Kleikamp 202ac27a0ecSDave Kleikamp printk(KERN_ERR "%s: aborting transaction: %s in %s\n", 203ac27a0ecSDave Kleikamp caller, errstr, err_fn); 204ac27a0ecSDave Kleikamp 205dab291afSMingming Cao jbd2_journal_abort_handle(handle); 206ac27a0ecSDave Kleikamp } 207ac27a0ecSDave Kleikamp 208ac27a0ecSDave Kleikamp /* Deal with the reporting of failure conditions on a filesystem such as 209ac27a0ecSDave Kleikamp * inconsistencies detected or read IO failures. 210ac27a0ecSDave Kleikamp * 211ac27a0ecSDave Kleikamp * On ext2, we can store the error state of the filesystem in the 212617ba13bSMingming Cao * superblock. That is not possible on ext4, because we may have other 213ac27a0ecSDave Kleikamp * write ordering constraints on the superblock which prevent us from 214ac27a0ecSDave Kleikamp * writing it out straight away; and given that the journal is about to 215ac27a0ecSDave Kleikamp * be aborted, we can't rely on the current, or future, transactions to 216ac27a0ecSDave Kleikamp * write out the superblock safely. 217ac27a0ecSDave Kleikamp * 218dab291afSMingming Cao * We'll just use the jbd2_journal_abort() error code to record an error in 219ac27a0ecSDave Kleikamp * the journal instead. On recovery, the journal will compain about 220ac27a0ecSDave Kleikamp * that error until we've noted it down and cleared it. 221ac27a0ecSDave Kleikamp */ 222ac27a0ecSDave Kleikamp 223617ba13bSMingming Cao static void ext4_handle_error(struct super_block *sb) 224ac27a0ecSDave Kleikamp { 225617ba13bSMingming Cao struct ext4_super_block *es = EXT4_SB(sb)->s_es; 226ac27a0ecSDave Kleikamp 227617ba13bSMingming Cao EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 228617ba13bSMingming Cao es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 229ac27a0ecSDave Kleikamp 230ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) 231ac27a0ecSDave Kleikamp return; 232ac27a0ecSDave Kleikamp 233ac27a0ecSDave Kleikamp if (!test_opt(sb, ERRORS_CONT)) { 234617ba13bSMingming Cao journal_t *journal = EXT4_SB(sb)->s_journal; 235ac27a0ecSDave Kleikamp 236617ba13bSMingming Cao EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; 237ac27a0ecSDave Kleikamp if (journal) 238dab291afSMingming Cao jbd2_journal_abort(journal, -EIO); 239ac27a0ecSDave Kleikamp } 240ac27a0ecSDave Kleikamp if (test_opt(sb, ERRORS_RO)) { 241ac27a0ecSDave Kleikamp printk(KERN_CRIT "Remounting filesystem read-only\n"); 242ac27a0ecSDave Kleikamp sb->s_flags |= MS_RDONLY; 243ac27a0ecSDave Kleikamp } 244617ba13bSMingming Cao ext4_commit_super(sb, es, 1); 245ac27a0ecSDave Kleikamp if (test_opt(sb, ERRORS_PANIC)) 246617ba13bSMingming Cao panic("EXT4-fs (device %s): panic forced after error\n", 247ac27a0ecSDave Kleikamp sb->s_id); 248ac27a0ecSDave Kleikamp } 249ac27a0ecSDave Kleikamp 250617ba13bSMingming Cao void ext4_error(struct super_block *sb, const char *function, 251ac27a0ecSDave Kleikamp const char *fmt, ...) 252ac27a0ecSDave Kleikamp { 253ac27a0ecSDave Kleikamp va_list args; 254ac27a0ecSDave Kleikamp 255ac27a0ecSDave Kleikamp va_start(args, fmt); 256617ba13bSMingming Cao printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function); 257ac27a0ecSDave Kleikamp vprintk(fmt, args); 258ac27a0ecSDave Kleikamp printk("\n"); 259ac27a0ecSDave Kleikamp va_end(args); 260ac27a0ecSDave Kleikamp 261617ba13bSMingming Cao ext4_handle_error(sb); 262ac27a0ecSDave Kleikamp } 263ac27a0ecSDave Kleikamp 264617ba13bSMingming Cao static const char *ext4_decode_error(struct super_block *sb, int errno, 265ac27a0ecSDave Kleikamp char nbuf[16]) 266ac27a0ecSDave Kleikamp { 267ac27a0ecSDave Kleikamp char *errstr = NULL; 268ac27a0ecSDave Kleikamp 269ac27a0ecSDave Kleikamp switch (errno) { 270ac27a0ecSDave Kleikamp case -EIO: 271ac27a0ecSDave Kleikamp errstr = "IO failure"; 272ac27a0ecSDave Kleikamp break; 273ac27a0ecSDave Kleikamp case -ENOMEM: 274ac27a0ecSDave Kleikamp errstr = "Out of memory"; 275ac27a0ecSDave Kleikamp break; 276ac27a0ecSDave Kleikamp case -EROFS: 277dab291afSMingming Cao if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT) 278ac27a0ecSDave Kleikamp errstr = "Journal has aborted"; 279ac27a0ecSDave Kleikamp else 280ac27a0ecSDave Kleikamp errstr = "Readonly filesystem"; 281ac27a0ecSDave Kleikamp break; 282ac27a0ecSDave Kleikamp default: 283ac27a0ecSDave Kleikamp /* If the caller passed in an extra buffer for unknown 284ac27a0ecSDave Kleikamp * errors, textualise them now. Else we just return 285ac27a0ecSDave Kleikamp * NULL. */ 286ac27a0ecSDave Kleikamp if (nbuf) { 287ac27a0ecSDave Kleikamp /* Check for truncated error codes... */ 288ac27a0ecSDave Kleikamp if (snprintf(nbuf, 16, "error %d", -errno) >= 0) 289ac27a0ecSDave Kleikamp errstr = nbuf; 290ac27a0ecSDave Kleikamp } 291ac27a0ecSDave Kleikamp break; 292ac27a0ecSDave Kleikamp } 293ac27a0ecSDave Kleikamp 294ac27a0ecSDave Kleikamp return errstr; 295ac27a0ecSDave Kleikamp } 296ac27a0ecSDave Kleikamp 297617ba13bSMingming Cao /* __ext4_std_error decodes expected errors from journaling functions 298ac27a0ecSDave Kleikamp * automatically and invokes the appropriate error response. */ 299ac27a0ecSDave Kleikamp 3002b2d6d01STheodore Ts'o void __ext4_std_error(struct super_block *sb, const char *function, int errno) 301ac27a0ecSDave Kleikamp { 302ac27a0ecSDave Kleikamp char nbuf[16]; 303ac27a0ecSDave Kleikamp const char *errstr; 304ac27a0ecSDave Kleikamp 305ac27a0ecSDave Kleikamp /* Special case: if the error is EROFS, and we're not already 306ac27a0ecSDave Kleikamp * inside a transaction, then there's really no point in logging 307ac27a0ecSDave Kleikamp * an error. */ 308ac27a0ecSDave Kleikamp if (errno == -EROFS && journal_current_handle() == NULL && 309ac27a0ecSDave Kleikamp (sb->s_flags & MS_RDONLY)) 310ac27a0ecSDave Kleikamp return; 311ac27a0ecSDave Kleikamp 312617ba13bSMingming Cao errstr = ext4_decode_error(sb, errno, nbuf); 313617ba13bSMingming Cao printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n", 314ac27a0ecSDave Kleikamp sb->s_id, function, errstr); 315ac27a0ecSDave Kleikamp 316617ba13bSMingming Cao ext4_handle_error(sb); 317ac27a0ecSDave Kleikamp } 318ac27a0ecSDave Kleikamp 319ac27a0ecSDave Kleikamp /* 320617ba13bSMingming Cao * ext4_abort is a much stronger failure handler than ext4_error. The 321ac27a0ecSDave Kleikamp * abort function may be used to deal with unrecoverable failures such 322ac27a0ecSDave Kleikamp * as journal IO errors or ENOMEM at a critical moment in log management. 323ac27a0ecSDave Kleikamp * 324ac27a0ecSDave Kleikamp * We unconditionally force the filesystem into an ABORT|READONLY state, 325ac27a0ecSDave Kleikamp * unless the error response on the fs has been set to panic in which 326ac27a0ecSDave Kleikamp * case we take the easy way out and panic immediately. 327ac27a0ecSDave Kleikamp */ 328ac27a0ecSDave Kleikamp 329617ba13bSMingming Cao void ext4_abort(struct super_block *sb, const char *function, 330ac27a0ecSDave Kleikamp const char *fmt, ...) 331ac27a0ecSDave Kleikamp { 332ac27a0ecSDave Kleikamp va_list args; 333ac27a0ecSDave Kleikamp 334617ba13bSMingming Cao printk(KERN_CRIT "ext4_abort called.\n"); 335ac27a0ecSDave Kleikamp 336ac27a0ecSDave Kleikamp va_start(args, fmt); 337617ba13bSMingming Cao printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function); 338ac27a0ecSDave Kleikamp vprintk(fmt, args); 339ac27a0ecSDave Kleikamp printk("\n"); 340ac27a0ecSDave Kleikamp va_end(args); 341ac27a0ecSDave Kleikamp 342ac27a0ecSDave Kleikamp if (test_opt(sb, ERRORS_PANIC)) 343617ba13bSMingming Cao panic("EXT4-fs panic from previous error\n"); 344ac27a0ecSDave Kleikamp 345ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) 346ac27a0ecSDave Kleikamp return; 347ac27a0ecSDave Kleikamp 348ac27a0ecSDave Kleikamp printk(KERN_CRIT "Remounting filesystem read-only\n"); 349617ba13bSMingming Cao EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 350ac27a0ecSDave Kleikamp sb->s_flags |= MS_RDONLY; 351617ba13bSMingming Cao EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; 352ef2cabf7SHidehiro Kawai if (EXT4_SB(sb)->s_journal) 353dab291afSMingming Cao jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); 354ac27a0ecSDave Kleikamp } 355ac27a0ecSDave Kleikamp 356617ba13bSMingming Cao void ext4_warning(struct super_block *sb, const char *function, 357ac27a0ecSDave Kleikamp const char *fmt, ...) 358ac27a0ecSDave Kleikamp { 359ac27a0ecSDave Kleikamp va_list args; 360ac27a0ecSDave Kleikamp 361ac27a0ecSDave Kleikamp va_start(args, fmt); 362617ba13bSMingming Cao printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ", 363ac27a0ecSDave Kleikamp sb->s_id, function); 364ac27a0ecSDave Kleikamp vprintk(fmt, args); 365ac27a0ecSDave Kleikamp printk("\n"); 366ac27a0ecSDave Kleikamp va_end(args); 367ac27a0ecSDave Kleikamp } 368ac27a0ecSDave Kleikamp 369617ba13bSMingming Cao void ext4_update_dynamic_rev(struct super_block *sb) 370ac27a0ecSDave Kleikamp { 371617ba13bSMingming Cao struct ext4_super_block *es = EXT4_SB(sb)->s_es; 372ac27a0ecSDave Kleikamp 373617ba13bSMingming Cao if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) 374ac27a0ecSDave Kleikamp return; 375ac27a0ecSDave Kleikamp 37646e665e9SHarvey Harrison ext4_warning(sb, __func__, 377ac27a0ecSDave Kleikamp "updating to rev %d because of new feature flag, " 378ac27a0ecSDave Kleikamp "running e2fsck is recommended", 379617ba13bSMingming Cao EXT4_DYNAMIC_REV); 380ac27a0ecSDave Kleikamp 381617ba13bSMingming Cao es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); 382617ba13bSMingming Cao es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); 383617ba13bSMingming Cao es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); 384ac27a0ecSDave Kleikamp /* leave es->s_feature_*compat flags alone */ 385ac27a0ecSDave Kleikamp /* es->s_uuid will be set by e2fsck if empty */ 386ac27a0ecSDave Kleikamp 387ac27a0ecSDave Kleikamp /* 388ac27a0ecSDave Kleikamp * The rest of the superblock fields should be zero, and if not it 389ac27a0ecSDave Kleikamp * means they are likely already in use, so leave them alone. We 390ac27a0ecSDave Kleikamp * can leave it up to e2fsck to clean up any inconsistencies there. 391ac27a0ecSDave Kleikamp */ 392ac27a0ecSDave Kleikamp } 393ac27a0ecSDave Kleikamp 394ac27a0ecSDave Kleikamp /* 395ac27a0ecSDave Kleikamp * Open the external journal device 396ac27a0ecSDave Kleikamp */ 397617ba13bSMingming Cao static struct block_device *ext4_blkdev_get(dev_t dev) 398ac27a0ecSDave Kleikamp { 399ac27a0ecSDave Kleikamp struct block_device *bdev; 400ac27a0ecSDave Kleikamp char b[BDEVNAME_SIZE]; 401ac27a0ecSDave Kleikamp 402ac27a0ecSDave Kleikamp bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); 403ac27a0ecSDave Kleikamp if (IS_ERR(bdev)) 404ac27a0ecSDave Kleikamp goto fail; 405ac27a0ecSDave Kleikamp return bdev; 406ac27a0ecSDave Kleikamp 407ac27a0ecSDave Kleikamp fail: 408617ba13bSMingming Cao printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n", 409ac27a0ecSDave Kleikamp __bdevname(dev, b), PTR_ERR(bdev)); 410ac27a0ecSDave Kleikamp return NULL; 411ac27a0ecSDave Kleikamp } 412ac27a0ecSDave Kleikamp 413ac27a0ecSDave Kleikamp /* 414ac27a0ecSDave Kleikamp * Release the journal device 415ac27a0ecSDave Kleikamp */ 416617ba13bSMingming Cao static int ext4_blkdev_put(struct block_device *bdev) 417ac27a0ecSDave Kleikamp { 418ac27a0ecSDave Kleikamp bd_release(bdev); 4199a1c3542SAl Viro return blkdev_put(bdev, FMODE_READ|FMODE_WRITE); 420ac27a0ecSDave Kleikamp } 421ac27a0ecSDave Kleikamp 422617ba13bSMingming Cao static int ext4_blkdev_remove(struct ext4_sb_info *sbi) 423ac27a0ecSDave Kleikamp { 424ac27a0ecSDave Kleikamp struct block_device *bdev; 425ac27a0ecSDave Kleikamp int ret = -ENODEV; 426ac27a0ecSDave Kleikamp 427ac27a0ecSDave Kleikamp bdev = sbi->journal_bdev; 428ac27a0ecSDave Kleikamp if (bdev) { 429617ba13bSMingming Cao ret = ext4_blkdev_put(bdev); 430ac27a0ecSDave Kleikamp sbi->journal_bdev = NULL; 431ac27a0ecSDave Kleikamp } 432ac27a0ecSDave Kleikamp return ret; 433ac27a0ecSDave Kleikamp } 434ac27a0ecSDave Kleikamp 435ac27a0ecSDave Kleikamp static inline struct inode *orphan_list_entry(struct list_head *l) 436ac27a0ecSDave Kleikamp { 437617ba13bSMingming Cao return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; 438ac27a0ecSDave Kleikamp } 439ac27a0ecSDave Kleikamp 440617ba13bSMingming Cao static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) 441ac27a0ecSDave Kleikamp { 442ac27a0ecSDave Kleikamp struct list_head *l; 443ac27a0ecSDave Kleikamp 444ac27a0ecSDave Kleikamp printk(KERN_ERR "sb orphan head is %d\n", 445ac27a0ecSDave Kleikamp le32_to_cpu(sbi->s_es->s_last_orphan)); 446ac27a0ecSDave Kleikamp 447ac27a0ecSDave Kleikamp printk(KERN_ERR "sb_info orphan list:\n"); 448ac27a0ecSDave Kleikamp list_for_each(l, &sbi->s_orphan) { 449ac27a0ecSDave Kleikamp struct inode *inode = orphan_list_entry(l); 450ac27a0ecSDave Kleikamp printk(KERN_ERR " " 451ac27a0ecSDave Kleikamp "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", 452ac27a0ecSDave Kleikamp inode->i_sb->s_id, inode->i_ino, inode, 453ac27a0ecSDave Kleikamp inode->i_mode, inode->i_nlink, 454ac27a0ecSDave Kleikamp NEXT_ORPHAN(inode)); 455ac27a0ecSDave Kleikamp } 456ac27a0ecSDave Kleikamp } 457ac27a0ecSDave Kleikamp 458617ba13bSMingming Cao static void ext4_put_super(struct super_block *sb) 459ac27a0ecSDave Kleikamp { 460617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 461617ba13bSMingming Cao struct ext4_super_block *es = sbi->s_es; 462ef2cabf7SHidehiro Kawai int i, err; 463ac27a0ecSDave Kleikamp 464c9de560dSAlex Tomas ext4_mb_release(sb); 465a86c6181SAlex Tomas ext4_ext_release(sb); 466617ba13bSMingming Cao ext4_xattr_put_super(sb); 4670390131bSFrank Mayhar if (sbi->s_journal) { 468ef2cabf7SHidehiro Kawai err = jbd2_journal_destroy(sbi->s_journal); 46947b4a50bSJan Kara sbi->s_journal = NULL; 470ef2cabf7SHidehiro Kawai if (err < 0) 4710390131bSFrank Mayhar ext4_abort(sb, __func__, 4720390131bSFrank Mayhar "Couldn't clean up the journal"); 4730390131bSFrank Mayhar } 474ac27a0ecSDave Kleikamp if (!(sb->s_flags & MS_RDONLY)) { 475617ba13bSMingming Cao EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 476ac27a0ecSDave Kleikamp es->s_state = cpu_to_le16(sbi->s_mount_state); 477617ba13bSMingming Cao ext4_commit_super(sb, es, 1); 478ac27a0ecSDave Kleikamp } 479240799cdSTheodore Ts'o if (sbi->s_proc) { 480240799cdSTheodore Ts'o remove_proc_entry("inode_readahead_blks", sbi->s_proc); 4819f6200bbSTheodore Ts'o remove_proc_entry(sb->s_id, ext4_proc_root); 482240799cdSTheodore Ts'o } 483ac27a0ecSDave Kleikamp 484ac27a0ecSDave Kleikamp for (i = 0; i < sbi->s_gdb_count; i++) 485ac27a0ecSDave Kleikamp brelse(sbi->s_group_desc[i]); 486ac27a0ecSDave Kleikamp kfree(sbi->s_group_desc); 487772cb7c8SJose R. Santos kfree(sbi->s_flex_groups); 488ac27a0ecSDave Kleikamp percpu_counter_destroy(&sbi->s_freeblocks_counter); 489ac27a0ecSDave Kleikamp percpu_counter_destroy(&sbi->s_freeinodes_counter); 490ac27a0ecSDave Kleikamp percpu_counter_destroy(&sbi->s_dirs_counter); 4916bc6e63fSAneesh Kumar K.V percpu_counter_destroy(&sbi->s_dirtyblocks_counter); 492ac27a0ecSDave Kleikamp brelse(sbi->s_sbh); 493ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 494ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) 495ac27a0ecSDave Kleikamp kfree(sbi->s_qf_names[i]); 496ac27a0ecSDave Kleikamp #endif 497ac27a0ecSDave Kleikamp 498ac27a0ecSDave Kleikamp /* Debugging code just in case the in-memory inode orphan list 499ac27a0ecSDave Kleikamp * isn't empty. The on-disk one can be non-empty if we've 500ac27a0ecSDave Kleikamp * detected an error and taken the fs readonly, but the 501ac27a0ecSDave Kleikamp * in-memory list had better be clean by this point. */ 502ac27a0ecSDave Kleikamp if (!list_empty(&sbi->s_orphan)) 503ac27a0ecSDave Kleikamp dump_orphan_list(sb, sbi); 504ac27a0ecSDave Kleikamp J_ASSERT(list_empty(&sbi->s_orphan)); 505ac27a0ecSDave Kleikamp 506f98393a6SPeter Zijlstra invalidate_bdev(sb->s_bdev); 507ac27a0ecSDave Kleikamp if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { 508ac27a0ecSDave Kleikamp /* 509ac27a0ecSDave Kleikamp * Invalidate the journal device's buffers. We don't want them 510ac27a0ecSDave Kleikamp * floating about in memory - the physical journal device may 511ac27a0ecSDave Kleikamp * hotswapped, and it breaks the `ro-after' testing code. 512ac27a0ecSDave Kleikamp */ 513ac27a0ecSDave Kleikamp sync_blockdev(sbi->journal_bdev); 514f98393a6SPeter Zijlstra invalidate_bdev(sbi->journal_bdev); 515617ba13bSMingming Cao ext4_blkdev_remove(sbi); 516ac27a0ecSDave Kleikamp } 517ac27a0ecSDave Kleikamp sb->s_fs_info = NULL; 518ac27a0ecSDave Kleikamp kfree(sbi); 519ac27a0ecSDave Kleikamp return; 520ac27a0ecSDave Kleikamp } 521ac27a0ecSDave Kleikamp 522e18b890bSChristoph Lameter static struct kmem_cache *ext4_inode_cachep; 523ac27a0ecSDave Kleikamp 524ac27a0ecSDave Kleikamp /* 525ac27a0ecSDave Kleikamp * Called inside transaction, so use GFP_NOFS 526ac27a0ecSDave Kleikamp */ 527617ba13bSMingming Cao static struct inode *ext4_alloc_inode(struct super_block *sb) 528ac27a0ecSDave Kleikamp { 529617ba13bSMingming Cao struct ext4_inode_info *ei; 530ac27a0ecSDave Kleikamp 531e6b4f8daSChristoph Lameter ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); 532ac27a0ecSDave Kleikamp if (!ei) 533ac27a0ecSDave Kleikamp return NULL; 53403010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 535617ba13bSMingming Cao ei->i_acl = EXT4_ACL_NOT_CACHED; 536617ba13bSMingming Cao ei->i_default_acl = EXT4_ACL_NOT_CACHED; 537ac27a0ecSDave Kleikamp #endif 538ac27a0ecSDave Kleikamp ei->vfs_inode.i_version = 1; 53991246c00SAneesh Kumar K.V ei->vfs_inode.i_data.writeback_index = 0; 540a86c6181SAlex Tomas memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); 541c9de560dSAlex Tomas INIT_LIST_HEAD(&ei->i_prealloc_list); 542c9de560dSAlex Tomas spin_lock_init(&ei->i_prealloc_lock); 5430390131bSFrank Mayhar /* 5440390131bSFrank Mayhar * Note: We can be called before EXT4_SB(sb)->s_journal is set, 5450390131bSFrank Mayhar * therefore it can be null here. Don't check it, just initialize 5460390131bSFrank Mayhar * jinode. 5470390131bSFrank Mayhar */ 548678aaf48SJan Kara jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode); 549d2a17637SMingming Cao ei->i_reserved_data_blocks = 0; 550d2a17637SMingming Cao ei->i_reserved_meta_blocks = 0; 551d2a17637SMingming Cao ei->i_allocated_meta_blocks = 0; 552d2a17637SMingming Cao ei->i_delalloc_reserved_flag = 0; 553d2a17637SMingming Cao spin_lock_init(&(ei->i_block_reservation_lock)); 554ac27a0ecSDave Kleikamp return &ei->vfs_inode; 555ac27a0ecSDave Kleikamp } 556ac27a0ecSDave Kleikamp 557617ba13bSMingming Cao static void ext4_destroy_inode(struct inode *inode) 558ac27a0ecSDave Kleikamp { 5599f7dd93dSVasily Averin if (!list_empty(&(EXT4_I(inode)->i_orphan))) { 5609f7dd93dSVasily Averin printk("EXT4 Inode %p: orphan list check failed!\n", 5619f7dd93dSVasily Averin EXT4_I(inode)); 5629f7dd93dSVasily Averin print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, 5639f7dd93dSVasily Averin EXT4_I(inode), sizeof(struct ext4_inode_info), 5649f7dd93dSVasily Averin true); 5659f7dd93dSVasily Averin dump_stack(); 5669f7dd93dSVasily Averin } 567617ba13bSMingming Cao kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); 568ac27a0ecSDave Kleikamp } 569ac27a0ecSDave Kleikamp 57051cc5068SAlexey Dobriyan static void init_once(void *foo) 571ac27a0ecSDave Kleikamp { 572617ba13bSMingming Cao struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; 573ac27a0ecSDave Kleikamp 574ac27a0ecSDave Kleikamp INIT_LIST_HEAD(&ei->i_orphan); 57503010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_XATTR 576ac27a0ecSDave Kleikamp init_rwsem(&ei->xattr_sem); 577ac27a0ecSDave Kleikamp #endif 5780e855ac8SAneesh Kumar K.V init_rwsem(&ei->i_data_sem); 579ac27a0ecSDave Kleikamp inode_init_once(&ei->vfs_inode); 580ac27a0ecSDave Kleikamp } 581ac27a0ecSDave Kleikamp 582ac27a0ecSDave Kleikamp static int init_inodecache(void) 583ac27a0ecSDave Kleikamp { 584617ba13bSMingming Cao ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", 585617ba13bSMingming Cao sizeof(struct ext4_inode_info), 586ac27a0ecSDave Kleikamp 0, (SLAB_RECLAIM_ACCOUNT| 587ac27a0ecSDave Kleikamp SLAB_MEM_SPREAD), 58820c2df83SPaul Mundt init_once); 589617ba13bSMingming Cao if (ext4_inode_cachep == NULL) 590ac27a0ecSDave Kleikamp return -ENOMEM; 591ac27a0ecSDave Kleikamp return 0; 592ac27a0ecSDave Kleikamp } 593ac27a0ecSDave Kleikamp 594ac27a0ecSDave Kleikamp static void destroy_inodecache(void) 595ac27a0ecSDave Kleikamp { 596617ba13bSMingming Cao kmem_cache_destroy(ext4_inode_cachep); 597ac27a0ecSDave Kleikamp } 598ac27a0ecSDave Kleikamp 599617ba13bSMingming Cao static void ext4_clear_inode(struct inode *inode) 600ac27a0ecSDave Kleikamp { 60103010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 602617ba13bSMingming Cao if (EXT4_I(inode)->i_acl && 603617ba13bSMingming Cao EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) { 604617ba13bSMingming Cao posix_acl_release(EXT4_I(inode)->i_acl); 605617ba13bSMingming Cao EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED; 606ac27a0ecSDave Kleikamp } 607617ba13bSMingming Cao if (EXT4_I(inode)->i_default_acl && 608617ba13bSMingming Cao EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) { 609617ba13bSMingming Cao posix_acl_release(EXT4_I(inode)->i_default_acl); 610617ba13bSMingming Cao EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED; 611ac27a0ecSDave Kleikamp } 612ac27a0ecSDave Kleikamp #endif 613c2ea3fdeSTheodore Ts'o ext4_discard_preallocations(inode); 6140390131bSFrank Mayhar if (EXT4_JOURNAL(inode)) 615678aaf48SJan Kara jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal, 616678aaf48SJan Kara &EXT4_I(inode)->jinode); 617ac27a0ecSDave Kleikamp } 618ac27a0ecSDave Kleikamp 6192b2d6d01STheodore Ts'o static inline void ext4_show_quota_options(struct seq_file *seq, 6202b2d6d01STheodore Ts'o struct super_block *sb) 621ac27a0ecSDave Kleikamp { 622ac27a0ecSDave Kleikamp #if defined(CONFIG_QUOTA) 623617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 624ac27a0ecSDave Kleikamp 625ac27a0ecSDave Kleikamp if (sbi->s_jquota_fmt) 626ac27a0ecSDave Kleikamp seq_printf(seq, ",jqfmt=%s", 627ac27a0ecSDave Kleikamp (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold" : "vfsv0"); 628ac27a0ecSDave Kleikamp 629ac27a0ecSDave Kleikamp if (sbi->s_qf_names[USRQUOTA]) 630ac27a0ecSDave Kleikamp seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); 631ac27a0ecSDave Kleikamp 632ac27a0ecSDave Kleikamp if (sbi->s_qf_names[GRPQUOTA]) 633ac27a0ecSDave Kleikamp seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); 634ac27a0ecSDave Kleikamp 635617ba13bSMingming Cao if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) 636ac27a0ecSDave Kleikamp seq_puts(seq, ",usrquota"); 637ac27a0ecSDave Kleikamp 638617ba13bSMingming Cao if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) 639ac27a0ecSDave Kleikamp seq_puts(seq, ",grpquota"); 640ac27a0ecSDave Kleikamp #endif 641ac27a0ecSDave Kleikamp } 642ac27a0ecSDave Kleikamp 643d9c9bef1SMiklos Szeredi /* 644d9c9bef1SMiklos Szeredi * Show an option if 645d9c9bef1SMiklos Szeredi * - it's set to a non-default value OR 646d9c9bef1SMiklos Szeredi * - if the per-sb default is different from the global default 647d9c9bef1SMiklos Szeredi */ 648617ba13bSMingming Cao static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs) 649ac27a0ecSDave Kleikamp { 650aa22df2cSAneesh Kumar K.V int def_errors; 651aa22df2cSAneesh Kumar K.V unsigned long def_mount_opts; 652ac27a0ecSDave Kleikamp struct super_block *sb = vfs->mnt_sb; 653d9c9bef1SMiklos Szeredi struct ext4_sb_info *sbi = EXT4_SB(sb); 654d9c9bef1SMiklos Szeredi struct ext4_super_block *es = sbi->s_es; 655d9c9bef1SMiklos Szeredi 656d9c9bef1SMiklos Szeredi def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 657aa22df2cSAneesh Kumar K.V def_errors = le16_to_cpu(es->s_errors); 658d9c9bef1SMiklos Szeredi 659d9c9bef1SMiklos Szeredi if (sbi->s_sb_block != 1) 660d9c9bef1SMiklos Szeredi seq_printf(seq, ",sb=%llu", sbi->s_sb_block); 661d9c9bef1SMiklos Szeredi if (test_opt(sb, MINIX_DF)) 662d9c9bef1SMiklos Szeredi seq_puts(seq, ",minixdf"); 663aa22df2cSAneesh Kumar K.V if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS)) 664d9c9bef1SMiklos Szeredi seq_puts(seq, ",grpid"); 665d9c9bef1SMiklos Szeredi if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS)) 666d9c9bef1SMiklos Szeredi seq_puts(seq, ",nogrpid"); 667d9c9bef1SMiklos Szeredi if (sbi->s_resuid != EXT4_DEF_RESUID || 668d9c9bef1SMiklos Szeredi le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) { 669d9c9bef1SMiklos Szeredi seq_printf(seq, ",resuid=%u", sbi->s_resuid); 670d9c9bef1SMiklos Szeredi } 671d9c9bef1SMiklos Szeredi if (sbi->s_resgid != EXT4_DEF_RESGID || 672d9c9bef1SMiklos Szeredi le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) { 673d9c9bef1SMiklos Szeredi seq_printf(seq, ",resgid=%u", sbi->s_resgid); 674d9c9bef1SMiklos Szeredi } 675bb4f397aSAneesh Kumar K.V if (test_opt(sb, ERRORS_RO)) { 676d9c9bef1SMiklos Szeredi if (def_errors == EXT4_ERRORS_PANIC || 677bb4f397aSAneesh Kumar K.V def_errors == EXT4_ERRORS_CONTINUE) { 678d9c9bef1SMiklos Szeredi seq_puts(seq, ",errors=remount-ro"); 679bb4f397aSAneesh Kumar K.V } 680bb4f397aSAneesh Kumar K.V } 681aa22df2cSAneesh Kumar K.V if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) 682bb4f397aSAneesh Kumar K.V seq_puts(seq, ",errors=continue"); 683aa22df2cSAneesh Kumar K.V if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) 684d9c9bef1SMiklos Szeredi seq_puts(seq, ",errors=panic"); 685aa22df2cSAneesh Kumar K.V if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16)) 686d9c9bef1SMiklos Szeredi seq_puts(seq, ",nouid32"); 687aa22df2cSAneesh Kumar K.V if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG)) 688d9c9bef1SMiklos Szeredi seq_puts(seq, ",debug"); 689d9c9bef1SMiklos Szeredi if (test_opt(sb, OLDALLOC)) 690d9c9bef1SMiklos Szeredi seq_puts(seq, ",oldalloc"); 69103010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_XATTR 692aa22df2cSAneesh Kumar K.V if (test_opt(sb, XATTR_USER) && 693aa22df2cSAneesh Kumar K.V !(def_mount_opts & EXT4_DEFM_XATTR_USER)) 694d9c9bef1SMiklos Szeredi seq_puts(seq, ",user_xattr"); 695d9c9bef1SMiklos Szeredi if (!test_opt(sb, XATTR_USER) && 696d9c9bef1SMiklos Szeredi (def_mount_opts & EXT4_DEFM_XATTR_USER)) { 697d9c9bef1SMiklos Szeredi seq_puts(seq, ",nouser_xattr"); 698d9c9bef1SMiklos Szeredi } 699d9c9bef1SMiklos Szeredi #endif 70003010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 701aa22df2cSAneesh Kumar K.V if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL)) 702d9c9bef1SMiklos Szeredi seq_puts(seq, ",acl"); 703d9c9bef1SMiklos Szeredi if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL)) 704d9c9bef1SMiklos Szeredi seq_puts(seq, ",noacl"); 705d9c9bef1SMiklos Szeredi #endif 706d9c9bef1SMiklos Szeredi if (!test_opt(sb, RESERVATION)) 707d9c9bef1SMiklos Szeredi seq_puts(seq, ",noreservation"); 70830773840STheodore Ts'o if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) { 709d9c9bef1SMiklos Szeredi seq_printf(seq, ",commit=%u", 710d9c9bef1SMiklos Szeredi (unsigned) (sbi->s_commit_interval / HZ)); 711d9c9bef1SMiklos Szeredi } 71230773840STheodore Ts'o if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) { 71330773840STheodore Ts'o seq_printf(seq, ",min_batch_time=%u", 71430773840STheodore Ts'o (unsigned) sbi->s_min_batch_time); 71530773840STheodore Ts'o } 71630773840STheodore Ts'o if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) { 71730773840STheodore Ts'o seq_printf(seq, ",max_batch_time=%u", 71830773840STheodore Ts'o (unsigned) sbi->s_min_batch_time); 71930773840STheodore Ts'o } 72030773840STheodore Ts'o 721571640caSEric Sandeen /* 722571640caSEric Sandeen * We're changing the default of barrier mount option, so 723571640caSEric Sandeen * let's always display its mount state so it's clear what its 724571640caSEric Sandeen * status is. 725571640caSEric Sandeen */ 726571640caSEric Sandeen seq_puts(seq, ",barrier="); 727571640caSEric Sandeen seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0"); 728cd0b6a39STheodore Ts'o if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) 729cd0b6a39STheodore Ts'o seq_puts(seq, ",journal_async_commit"); 730d9c9bef1SMiklos Szeredi if (test_opt(sb, NOBH)) 731d9c9bef1SMiklos Szeredi seq_puts(seq, ",nobh"); 732d9c9bef1SMiklos Szeredi if (!test_opt(sb, EXTENTS)) 733d9c9bef1SMiklos Szeredi seq_puts(seq, ",noextents"); 73425ec56b5SJean Noel Cordenner if (test_opt(sb, I_VERSION)) 73525ec56b5SJean Noel Cordenner seq_puts(seq, ",i_version"); 736dd919b98SAneesh Kumar K.V if (!test_opt(sb, DELALLOC)) 737dd919b98SAneesh Kumar K.V seq_puts(seq, ",nodelalloc"); 738dd919b98SAneesh Kumar K.V 739ac27a0ecSDave Kleikamp 740cb45bbe4SMiklos Szeredi if (sbi->s_stripe) 741cb45bbe4SMiklos Szeredi seq_printf(seq, ",stripe=%lu", sbi->s_stripe); 742aa22df2cSAneesh Kumar K.V /* 743aa22df2cSAneesh Kumar K.V * journal mode get enabled in different ways 744aa22df2cSAneesh Kumar K.V * So just print the value even if we didn't specify it 745aa22df2cSAneesh Kumar K.V */ 746617ba13bSMingming Cao if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 747ac27a0ecSDave Kleikamp seq_puts(seq, ",data=journal"); 748617ba13bSMingming Cao else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 749ac27a0ecSDave Kleikamp seq_puts(seq, ",data=ordered"); 750617ba13bSMingming Cao else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) 751ac27a0ecSDave Kleikamp seq_puts(seq, ",data=writeback"); 752ac27a0ecSDave Kleikamp 753240799cdSTheodore Ts'o if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS) 754240799cdSTheodore Ts'o seq_printf(seq, ",inode_readahead_blks=%u", 755240799cdSTheodore Ts'o sbi->s_inode_readahead_blks); 756240799cdSTheodore Ts'o 7575bf5683aSHidehiro Kawai if (test_opt(sb, DATA_ERR_ABORT)) 7585bf5683aSHidehiro Kawai seq_puts(seq, ",data_err=abort"); 7595bf5683aSHidehiro Kawai 760617ba13bSMingming Cao ext4_show_quota_options(seq, sb); 761ac27a0ecSDave Kleikamp return 0; 762ac27a0ecSDave Kleikamp } 763ac27a0ecSDave Kleikamp 764ac27a0ecSDave Kleikamp 7651b961ac0SChristoph Hellwig static struct inode *ext4_nfs_get_inode(struct super_block *sb, 7661b961ac0SChristoph Hellwig u64 ino, u32 generation) 767ac27a0ecSDave Kleikamp { 768ac27a0ecSDave Kleikamp struct inode *inode; 769ac27a0ecSDave Kleikamp 770617ba13bSMingming Cao if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) 771ac27a0ecSDave Kleikamp return ERR_PTR(-ESTALE); 772617ba13bSMingming Cao if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) 773ac27a0ecSDave Kleikamp return ERR_PTR(-ESTALE); 774ac27a0ecSDave Kleikamp 775ac27a0ecSDave Kleikamp /* iget isn't really right if the inode is currently unallocated!! 776ac27a0ecSDave Kleikamp * 777617ba13bSMingming Cao * ext4_read_inode will return a bad_inode if the inode had been 778ac27a0ecSDave Kleikamp * deleted, so we should be safe. 779ac27a0ecSDave Kleikamp * 780ac27a0ecSDave Kleikamp * Currently we don't know the generation for parent directory, so 781ac27a0ecSDave Kleikamp * a generation of 0 means "accept any" 782ac27a0ecSDave Kleikamp */ 7831d1fe1eeSDavid Howells inode = ext4_iget(sb, ino); 7841d1fe1eeSDavid Howells if (IS_ERR(inode)) 7851d1fe1eeSDavid Howells return ERR_CAST(inode); 7861d1fe1eeSDavid Howells if (generation && inode->i_generation != generation) { 787ac27a0ecSDave Kleikamp iput(inode); 788ac27a0ecSDave Kleikamp return ERR_PTR(-ESTALE); 789ac27a0ecSDave Kleikamp } 7901b961ac0SChristoph Hellwig 7911b961ac0SChristoph Hellwig return inode; 792ac27a0ecSDave Kleikamp } 7931b961ac0SChristoph Hellwig 7941b961ac0SChristoph Hellwig static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, 7951b961ac0SChristoph Hellwig int fh_len, int fh_type) 7961b961ac0SChristoph Hellwig { 7971b961ac0SChristoph Hellwig return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 7981b961ac0SChristoph Hellwig ext4_nfs_get_inode); 7991b961ac0SChristoph Hellwig } 8001b961ac0SChristoph Hellwig 8011b961ac0SChristoph Hellwig static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, 8021b961ac0SChristoph Hellwig int fh_len, int fh_type) 8031b961ac0SChristoph Hellwig { 8041b961ac0SChristoph Hellwig return generic_fh_to_parent(sb, fid, fh_len, fh_type, 8051b961ac0SChristoph Hellwig ext4_nfs_get_inode); 806ac27a0ecSDave Kleikamp } 807ac27a0ecSDave Kleikamp 808ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 809ac27a0ecSDave Kleikamp #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group") 810ac27a0ecSDave Kleikamp #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) 811ac27a0ecSDave Kleikamp 812617ba13bSMingming Cao static int ext4_dquot_initialize(struct inode *inode, int type); 813617ba13bSMingming Cao static int ext4_dquot_drop(struct inode *inode); 814617ba13bSMingming Cao static int ext4_write_dquot(struct dquot *dquot); 815617ba13bSMingming Cao static int ext4_acquire_dquot(struct dquot *dquot); 816617ba13bSMingming Cao static int ext4_release_dquot(struct dquot *dquot); 817617ba13bSMingming Cao static int ext4_mark_dquot_dirty(struct dquot *dquot); 818617ba13bSMingming Cao static int ext4_write_info(struct super_block *sb, int type); 8196f28e087SJan Kara static int ext4_quota_on(struct super_block *sb, int type, int format_id, 8206f28e087SJan Kara char *path, int remount); 821617ba13bSMingming Cao static int ext4_quota_on_mount(struct super_block *sb, int type); 822617ba13bSMingming Cao static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 823ac27a0ecSDave Kleikamp size_t len, loff_t off); 824617ba13bSMingming Cao static ssize_t ext4_quota_write(struct super_block *sb, int type, 825ac27a0ecSDave Kleikamp const char *data, size_t len, loff_t off); 826ac27a0ecSDave Kleikamp 827617ba13bSMingming Cao static struct dquot_operations ext4_quota_operations = { 828617ba13bSMingming Cao .initialize = ext4_dquot_initialize, 829617ba13bSMingming Cao .drop = ext4_dquot_drop, 830ac27a0ecSDave Kleikamp .alloc_space = dquot_alloc_space, 831ac27a0ecSDave Kleikamp .alloc_inode = dquot_alloc_inode, 832ac27a0ecSDave Kleikamp .free_space = dquot_free_space, 833ac27a0ecSDave Kleikamp .free_inode = dquot_free_inode, 834ac27a0ecSDave Kleikamp .transfer = dquot_transfer, 835617ba13bSMingming Cao .write_dquot = ext4_write_dquot, 836617ba13bSMingming Cao .acquire_dquot = ext4_acquire_dquot, 837617ba13bSMingming Cao .release_dquot = ext4_release_dquot, 838617ba13bSMingming Cao .mark_dirty = ext4_mark_dquot_dirty, 839617ba13bSMingming Cao .write_info = ext4_write_info 840ac27a0ecSDave Kleikamp }; 841ac27a0ecSDave Kleikamp 842617ba13bSMingming Cao static struct quotactl_ops ext4_qctl_operations = { 843617ba13bSMingming Cao .quota_on = ext4_quota_on, 844ac27a0ecSDave Kleikamp .quota_off = vfs_quota_off, 845ac27a0ecSDave Kleikamp .quota_sync = vfs_quota_sync, 846ac27a0ecSDave Kleikamp .get_info = vfs_get_dqinfo, 847ac27a0ecSDave Kleikamp .set_info = vfs_set_dqinfo, 848ac27a0ecSDave Kleikamp .get_dqblk = vfs_get_dqblk, 849ac27a0ecSDave Kleikamp .set_dqblk = vfs_set_dqblk 850ac27a0ecSDave Kleikamp }; 851ac27a0ecSDave Kleikamp #endif 852ac27a0ecSDave Kleikamp 853ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations ext4_sops = { 854617ba13bSMingming Cao .alloc_inode = ext4_alloc_inode, 855617ba13bSMingming Cao .destroy_inode = ext4_destroy_inode, 856617ba13bSMingming Cao .write_inode = ext4_write_inode, 857617ba13bSMingming Cao .dirty_inode = ext4_dirty_inode, 858617ba13bSMingming Cao .delete_inode = ext4_delete_inode, 859617ba13bSMingming Cao .put_super = ext4_put_super, 860617ba13bSMingming Cao .write_super = ext4_write_super, 861617ba13bSMingming Cao .sync_fs = ext4_sync_fs, 862617ba13bSMingming Cao .write_super_lockfs = ext4_write_super_lockfs, 863617ba13bSMingming Cao .unlockfs = ext4_unlockfs, 864617ba13bSMingming Cao .statfs = ext4_statfs, 865617ba13bSMingming Cao .remount_fs = ext4_remount, 866617ba13bSMingming Cao .clear_inode = ext4_clear_inode, 867617ba13bSMingming Cao .show_options = ext4_show_options, 868ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 869617ba13bSMingming Cao .quota_read = ext4_quota_read, 870617ba13bSMingming Cao .quota_write = ext4_quota_write, 871ac27a0ecSDave Kleikamp #endif 872ac27a0ecSDave Kleikamp }; 873ac27a0ecSDave Kleikamp 87439655164SChristoph Hellwig static const struct export_operations ext4_export_ops = { 8751b961ac0SChristoph Hellwig .fh_to_dentry = ext4_fh_to_dentry, 8761b961ac0SChristoph Hellwig .fh_to_parent = ext4_fh_to_parent, 877617ba13bSMingming Cao .get_parent = ext4_get_parent, 878ac27a0ecSDave Kleikamp }; 879ac27a0ecSDave Kleikamp 880ac27a0ecSDave Kleikamp enum { 881ac27a0ecSDave Kleikamp Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 882ac27a0ecSDave Kleikamp Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, 88301436ef2STheodore Ts'o Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov, 884ac27a0ecSDave Kleikamp Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, 885ac27a0ecSDave Kleikamp Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh, 88630773840STheodore Ts'o Opt_commit, Opt_min_batch_time, Opt_max_batch_time, 88730773840STheodore Ts'o Opt_journal_update, Opt_journal_inum, Opt_journal_dev, 888818d276cSGirish Shilamkar Opt_journal_checksum, Opt_journal_async_commit, 889ac27a0ecSDave Kleikamp Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, 8905bf5683aSHidehiro Kawai Opt_data_err_abort, Opt_data_err_ignore, 891ac27a0ecSDave Kleikamp Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, 892ac27a0ecSDave Kleikamp Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota, 893ac27a0ecSDave Kleikamp Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota, 89425ec56b5SJean Noel Cordenner Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version, 89501436ef2STheodore Ts'o Opt_stripe, Opt_delalloc, Opt_nodelalloc, 896240799cdSTheodore Ts'o Opt_inode_readahead_blks 897ac27a0ecSDave Kleikamp }; 898ac27a0ecSDave Kleikamp 899a447c093SSteven Whitehouse static const match_table_t tokens = { 900ac27a0ecSDave Kleikamp {Opt_bsd_df, "bsddf"}, 901ac27a0ecSDave Kleikamp {Opt_minix_df, "minixdf"}, 902ac27a0ecSDave Kleikamp {Opt_grpid, "grpid"}, 903ac27a0ecSDave Kleikamp {Opt_grpid, "bsdgroups"}, 904ac27a0ecSDave Kleikamp {Opt_nogrpid, "nogrpid"}, 905ac27a0ecSDave Kleikamp {Opt_nogrpid, "sysvgroups"}, 906ac27a0ecSDave Kleikamp {Opt_resgid, "resgid=%u"}, 907ac27a0ecSDave Kleikamp {Opt_resuid, "resuid=%u"}, 908ac27a0ecSDave Kleikamp {Opt_sb, "sb=%u"}, 909ac27a0ecSDave Kleikamp {Opt_err_cont, "errors=continue"}, 910ac27a0ecSDave Kleikamp {Opt_err_panic, "errors=panic"}, 911ac27a0ecSDave Kleikamp {Opt_err_ro, "errors=remount-ro"}, 912ac27a0ecSDave Kleikamp {Opt_nouid32, "nouid32"}, 913ac27a0ecSDave Kleikamp {Opt_debug, "debug"}, 914ac27a0ecSDave Kleikamp {Opt_oldalloc, "oldalloc"}, 915ac27a0ecSDave Kleikamp {Opt_orlov, "orlov"}, 916ac27a0ecSDave Kleikamp {Opt_user_xattr, "user_xattr"}, 917ac27a0ecSDave Kleikamp {Opt_nouser_xattr, "nouser_xattr"}, 918ac27a0ecSDave Kleikamp {Opt_acl, "acl"}, 919ac27a0ecSDave Kleikamp {Opt_noacl, "noacl"}, 920ac27a0ecSDave Kleikamp {Opt_reservation, "reservation"}, 921ac27a0ecSDave Kleikamp {Opt_noreservation, "noreservation"}, 922ac27a0ecSDave Kleikamp {Opt_noload, "noload"}, 923ac27a0ecSDave Kleikamp {Opt_nobh, "nobh"}, 924ac27a0ecSDave Kleikamp {Opt_bh, "bh"}, 925ac27a0ecSDave Kleikamp {Opt_commit, "commit=%u"}, 92630773840STheodore Ts'o {Opt_min_batch_time, "min_batch_time=%u"}, 92730773840STheodore Ts'o {Opt_max_batch_time, "max_batch_time=%u"}, 928ac27a0ecSDave Kleikamp {Opt_journal_update, "journal=update"}, 929ac27a0ecSDave Kleikamp {Opt_journal_inum, "journal=%u"}, 930ac27a0ecSDave Kleikamp {Opt_journal_dev, "journal_dev=%u"}, 931818d276cSGirish Shilamkar {Opt_journal_checksum, "journal_checksum"}, 932818d276cSGirish Shilamkar {Opt_journal_async_commit, "journal_async_commit"}, 933ac27a0ecSDave Kleikamp {Opt_abort, "abort"}, 934ac27a0ecSDave Kleikamp {Opt_data_journal, "data=journal"}, 935ac27a0ecSDave Kleikamp {Opt_data_ordered, "data=ordered"}, 936ac27a0ecSDave Kleikamp {Opt_data_writeback, "data=writeback"}, 9375bf5683aSHidehiro Kawai {Opt_data_err_abort, "data_err=abort"}, 9385bf5683aSHidehiro Kawai {Opt_data_err_ignore, "data_err=ignore"}, 939ac27a0ecSDave Kleikamp {Opt_offusrjquota, "usrjquota="}, 940ac27a0ecSDave Kleikamp {Opt_usrjquota, "usrjquota=%s"}, 941ac27a0ecSDave Kleikamp {Opt_offgrpjquota, "grpjquota="}, 942ac27a0ecSDave Kleikamp {Opt_grpjquota, "grpjquota=%s"}, 943ac27a0ecSDave Kleikamp {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, 944ac27a0ecSDave Kleikamp {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, 945ac27a0ecSDave Kleikamp {Opt_grpquota, "grpquota"}, 946ac27a0ecSDave Kleikamp {Opt_noquota, "noquota"}, 947ac27a0ecSDave Kleikamp {Opt_quota, "quota"}, 948ac27a0ecSDave Kleikamp {Opt_usrquota, "usrquota"}, 949ac27a0ecSDave Kleikamp {Opt_barrier, "barrier=%u"}, 950a86c6181SAlex Tomas {Opt_extents, "extents"}, 9511e2462f9SMingming Cao {Opt_noextents, "noextents"}, 95225ec56b5SJean Noel Cordenner {Opt_i_version, "i_version"}, 953c9de560dSAlex Tomas {Opt_stripe, "stripe=%u"}, 954ac27a0ecSDave Kleikamp {Opt_resize, "resize"}, 95564769240SAlex Tomas {Opt_delalloc, "delalloc"}, 956dd919b98SAneesh Kumar K.V {Opt_nodelalloc, "nodelalloc"}, 957240799cdSTheodore Ts'o {Opt_inode_readahead_blks, "inode_readahead_blks=%u"}, 958f3f12faaSJosef Bacik {Opt_err, NULL}, 959ac27a0ecSDave Kleikamp }; 960ac27a0ecSDave Kleikamp 961617ba13bSMingming Cao static ext4_fsblk_t get_sb_block(void **data) 962ac27a0ecSDave Kleikamp { 963617ba13bSMingming Cao ext4_fsblk_t sb_block; 964ac27a0ecSDave Kleikamp char *options = (char *) *data; 965ac27a0ecSDave Kleikamp 966ac27a0ecSDave Kleikamp if (!options || strncmp(options, "sb=", 3) != 0) 967ac27a0ecSDave Kleikamp return 1; /* Default location */ 968ac27a0ecSDave Kleikamp options += 3; 969617ba13bSMingming Cao /*todo: use simple_strtoll with >32bit ext4 */ 970ac27a0ecSDave Kleikamp sb_block = simple_strtoul(options, &options, 0); 971ac27a0ecSDave Kleikamp if (*options && *options != ',') { 9724776004fSTheodore Ts'o printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n", 973ac27a0ecSDave Kleikamp (char *) *data); 974ac27a0ecSDave Kleikamp return 1; 975ac27a0ecSDave Kleikamp } 976ac27a0ecSDave Kleikamp if (*options == ',') 977ac27a0ecSDave Kleikamp options++; 978ac27a0ecSDave Kleikamp *data = (void *) options; 979ac27a0ecSDave Kleikamp return sb_block; 980ac27a0ecSDave Kleikamp } 981ac27a0ecSDave Kleikamp 982ac27a0ecSDave Kleikamp static int parse_options(char *options, struct super_block *sb, 983ac27a0ecSDave Kleikamp unsigned int *inum, unsigned long *journal_devnum, 984617ba13bSMingming Cao ext4_fsblk_t *n_blocks_count, int is_remount) 985ac27a0ecSDave Kleikamp { 986617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 987ac27a0ecSDave Kleikamp char *p; 988ac27a0ecSDave Kleikamp substring_t args[MAX_OPT_ARGS]; 989ac27a0ecSDave Kleikamp int data_opt = 0; 990ac27a0ecSDave Kleikamp int option; 991ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 992dfc5d03fSJan Kara int qtype, qfmt; 993ac27a0ecSDave Kleikamp char *qname; 994ac27a0ecSDave Kleikamp #endif 995c07651b5SAneesh Kumar K.V ext4_fsblk_t last_block; 996ac27a0ecSDave Kleikamp 997ac27a0ecSDave Kleikamp if (!options) 998ac27a0ecSDave Kleikamp return 1; 999ac27a0ecSDave Kleikamp 1000ac27a0ecSDave Kleikamp while ((p = strsep(&options, ",")) != NULL) { 1001ac27a0ecSDave Kleikamp int token; 1002ac27a0ecSDave Kleikamp if (!*p) 1003ac27a0ecSDave Kleikamp continue; 1004ac27a0ecSDave Kleikamp 1005ac27a0ecSDave Kleikamp token = match_token(p, tokens, args); 1006ac27a0ecSDave Kleikamp switch (token) { 1007ac27a0ecSDave Kleikamp case Opt_bsd_df: 1008ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, MINIX_DF); 1009ac27a0ecSDave Kleikamp break; 1010ac27a0ecSDave Kleikamp case Opt_minix_df: 1011ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, MINIX_DF); 1012ac27a0ecSDave Kleikamp break; 1013ac27a0ecSDave Kleikamp case Opt_grpid: 1014ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, GRPID); 1015ac27a0ecSDave Kleikamp break; 1016ac27a0ecSDave Kleikamp case Opt_nogrpid: 1017ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, GRPID); 1018ac27a0ecSDave Kleikamp break; 1019ac27a0ecSDave Kleikamp case Opt_resuid: 1020ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 1021ac27a0ecSDave Kleikamp return 0; 1022ac27a0ecSDave Kleikamp sbi->s_resuid = option; 1023ac27a0ecSDave Kleikamp break; 1024ac27a0ecSDave Kleikamp case Opt_resgid: 1025ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 1026ac27a0ecSDave Kleikamp return 0; 1027ac27a0ecSDave Kleikamp sbi->s_resgid = option; 1028ac27a0ecSDave Kleikamp break; 1029ac27a0ecSDave Kleikamp case Opt_sb: 1030ac27a0ecSDave Kleikamp /* handled by get_sb_block() instead of here */ 1031ac27a0ecSDave Kleikamp /* *sb_block = match_int(&args[0]); */ 1032ac27a0ecSDave Kleikamp break; 1033ac27a0ecSDave Kleikamp case Opt_err_panic: 1034ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, ERRORS_CONT); 1035ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, ERRORS_RO); 1036ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, ERRORS_PANIC); 1037ac27a0ecSDave Kleikamp break; 1038ac27a0ecSDave Kleikamp case Opt_err_ro: 1039ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, ERRORS_CONT); 1040ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, ERRORS_PANIC); 1041ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, ERRORS_RO); 1042ac27a0ecSDave Kleikamp break; 1043ac27a0ecSDave Kleikamp case Opt_err_cont: 1044ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, ERRORS_RO); 1045ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, ERRORS_PANIC); 1046ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, ERRORS_CONT); 1047ac27a0ecSDave Kleikamp break; 1048ac27a0ecSDave Kleikamp case Opt_nouid32: 1049ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, NO_UID32); 1050ac27a0ecSDave Kleikamp break; 1051ac27a0ecSDave Kleikamp case Opt_debug: 1052ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, DEBUG); 1053ac27a0ecSDave Kleikamp break; 1054ac27a0ecSDave Kleikamp case Opt_oldalloc: 1055ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, OLDALLOC); 1056ac27a0ecSDave Kleikamp break; 1057ac27a0ecSDave Kleikamp case Opt_orlov: 1058ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, OLDALLOC); 1059ac27a0ecSDave Kleikamp break; 106003010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_XATTR 1061ac27a0ecSDave Kleikamp case Opt_user_xattr: 1062ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, XATTR_USER); 1063ac27a0ecSDave Kleikamp break; 1064ac27a0ecSDave Kleikamp case Opt_nouser_xattr: 1065ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, XATTR_USER); 1066ac27a0ecSDave Kleikamp break; 1067ac27a0ecSDave Kleikamp #else 1068ac27a0ecSDave Kleikamp case Opt_user_xattr: 1069ac27a0ecSDave Kleikamp case Opt_nouser_xattr: 10704776004fSTheodore Ts'o printk(KERN_ERR "EXT4 (no)user_xattr options " 10714776004fSTheodore Ts'o "not supported\n"); 1072ac27a0ecSDave Kleikamp break; 1073ac27a0ecSDave Kleikamp #endif 107403010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 1075ac27a0ecSDave Kleikamp case Opt_acl: 1076ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, POSIX_ACL); 1077ac27a0ecSDave Kleikamp break; 1078ac27a0ecSDave Kleikamp case Opt_noacl: 1079ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, POSIX_ACL); 1080ac27a0ecSDave Kleikamp break; 1081ac27a0ecSDave Kleikamp #else 1082ac27a0ecSDave Kleikamp case Opt_acl: 1083ac27a0ecSDave Kleikamp case Opt_noacl: 10844776004fSTheodore Ts'o printk(KERN_ERR "EXT4 (no)acl options " 10854776004fSTheodore Ts'o "not supported\n"); 1086ac27a0ecSDave Kleikamp break; 1087ac27a0ecSDave Kleikamp #endif 1088ac27a0ecSDave Kleikamp case Opt_reservation: 1089ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, RESERVATION); 1090ac27a0ecSDave Kleikamp break; 1091ac27a0ecSDave Kleikamp case Opt_noreservation: 1092ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, RESERVATION); 1093ac27a0ecSDave Kleikamp break; 1094ac27a0ecSDave Kleikamp case Opt_journal_update: 1095ac27a0ecSDave Kleikamp /* @@@ FIXME */ 1096ac27a0ecSDave Kleikamp /* Eventually we will want to be able to create 1097ac27a0ecSDave Kleikamp a journal file here. For now, only allow the 1098ac27a0ecSDave Kleikamp user to specify an existing inode to be the 1099ac27a0ecSDave Kleikamp journal file. */ 1100ac27a0ecSDave Kleikamp if (is_remount) { 1101617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: cannot specify " 1102ac27a0ecSDave Kleikamp "journal on remount\n"); 1103ac27a0ecSDave Kleikamp return 0; 1104ac27a0ecSDave Kleikamp } 1105ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, UPDATE_JOURNAL); 1106ac27a0ecSDave Kleikamp break; 1107ac27a0ecSDave Kleikamp case Opt_journal_inum: 1108ac27a0ecSDave Kleikamp if (is_remount) { 1109617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: cannot specify " 1110ac27a0ecSDave Kleikamp "journal on remount\n"); 1111ac27a0ecSDave Kleikamp return 0; 1112ac27a0ecSDave Kleikamp } 1113ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 1114ac27a0ecSDave Kleikamp return 0; 1115ac27a0ecSDave Kleikamp *inum = option; 1116ac27a0ecSDave Kleikamp break; 1117ac27a0ecSDave Kleikamp case Opt_journal_dev: 1118ac27a0ecSDave Kleikamp if (is_remount) { 1119617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: cannot specify " 1120ac27a0ecSDave Kleikamp "journal on remount\n"); 1121ac27a0ecSDave Kleikamp return 0; 1122ac27a0ecSDave Kleikamp } 1123ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 1124ac27a0ecSDave Kleikamp return 0; 1125ac27a0ecSDave Kleikamp *journal_devnum = option; 1126ac27a0ecSDave Kleikamp break; 1127818d276cSGirish Shilamkar case Opt_journal_checksum: 1128818d276cSGirish Shilamkar set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); 1129818d276cSGirish Shilamkar break; 1130818d276cSGirish Shilamkar case Opt_journal_async_commit: 1131818d276cSGirish Shilamkar set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT); 1132818d276cSGirish Shilamkar set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); 1133818d276cSGirish Shilamkar break; 1134ac27a0ecSDave Kleikamp case Opt_noload: 1135ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, NOLOAD); 1136ac27a0ecSDave Kleikamp break; 1137ac27a0ecSDave Kleikamp case Opt_commit: 1138ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 1139ac27a0ecSDave Kleikamp return 0; 1140ac27a0ecSDave Kleikamp if (option < 0) 1141ac27a0ecSDave Kleikamp return 0; 1142ac27a0ecSDave Kleikamp if (option == 0) 1143cd02ff0bSMingming Cao option = JBD2_DEFAULT_MAX_COMMIT_AGE; 1144ac27a0ecSDave Kleikamp sbi->s_commit_interval = HZ * option; 1145ac27a0ecSDave Kleikamp break; 114630773840STheodore Ts'o case Opt_max_batch_time: 114730773840STheodore Ts'o if (match_int(&args[0], &option)) 114830773840STheodore Ts'o return 0; 114930773840STheodore Ts'o if (option < 0) 115030773840STheodore Ts'o return 0; 115130773840STheodore Ts'o if (option == 0) 115230773840STheodore Ts'o option = EXT4_DEF_MAX_BATCH_TIME; 115330773840STheodore Ts'o sbi->s_max_batch_time = option; 115430773840STheodore Ts'o break; 115530773840STheodore Ts'o case Opt_min_batch_time: 115630773840STheodore Ts'o if (match_int(&args[0], &option)) 115730773840STheodore Ts'o return 0; 115830773840STheodore Ts'o if (option < 0) 115930773840STheodore Ts'o return 0; 116030773840STheodore Ts'o sbi->s_min_batch_time = option; 116130773840STheodore Ts'o break; 1162ac27a0ecSDave Kleikamp case Opt_data_journal: 1163617ba13bSMingming Cao data_opt = EXT4_MOUNT_JOURNAL_DATA; 1164ac27a0ecSDave Kleikamp goto datacheck; 1165ac27a0ecSDave Kleikamp case Opt_data_ordered: 1166617ba13bSMingming Cao data_opt = EXT4_MOUNT_ORDERED_DATA; 1167ac27a0ecSDave Kleikamp goto datacheck; 1168ac27a0ecSDave Kleikamp case Opt_data_writeback: 1169617ba13bSMingming Cao data_opt = EXT4_MOUNT_WRITEBACK_DATA; 1170ac27a0ecSDave Kleikamp datacheck: 1171ac27a0ecSDave Kleikamp if (is_remount) { 1172617ba13bSMingming Cao if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS) 1173ac27a0ecSDave Kleikamp != data_opt) { 1174ac27a0ecSDave Kleikamp printk(KERN_ERR 1175617ba13bSMingming Cao "EXT4-fs: cannot change data " 1176ac27a0ecSDave Kleikamp "mode on remount\n"); 1177ac27a0ecSDave Kleikamp return 0; 1178ac27a0ecSDave Kleikamp } 1179ac27a0ecSDave Kleikamp } else { 1180617ba13bSMingming Cao sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS; 1181ac27a0ecSDave Kleikamp sbi->s_mount_opt |= data_opt; 1182ac27a0ecSDave Kleikamp } 1183ac27a0ecSDave Kleikamp break; 11845bf5683aSHidehiro Kawai case Opt_data_err_abort: 11855bf5683aSHidehiro Kawai set_opt(sbi->s_mount_opt, DATA_ERR_ABORT); 11865bf5683aSHidehiro Kawai break; 11875bf5683aSHidehiro Kawai case Opt_data_err_ignore: 11885bf5683aSHidehiro Kawai clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT); 11895bf5683aSHidehiro Kawai break; 1190ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1191ac27a0ecSDave Kleikamp case Opt_usrjquota: 1192ac27a0ecSDave Kleikamp qtype = USRQUOTA; 1193ac27a0ecSDave Kleikamp goto set_qf_name; 1194ac27a0ecSDave Kleikamp case Opt_grpjquota: 1195ac27a0ecSDave Kleikamp qtype = GRPQUOTA; 1196ac27a0ecSDave Kleikamp set_qf_name: 1197dfc5d03fSJan Kara if ((sb_any_quota_enabled(sb) || 1198dfc5d03fSJan Kara sb_any_quota_suspended(sb)) && 1199dfc5d03fSJan Kara !sbi->s_qf_names[qtype]) { 1200ac27a0ecSDave Kleikamp printk(KERN_ERR 12012c8be6b2SJan Kara "EXT4-fs: Cannot change journaled " 1202ac27a0ecSDave Kleikamp "quota options when quota turned on.\n"); 1203ac27a0ecSDave Kleikamp return 0; 1204ac27a0ecSDave Kleikamp } 1205ac27a0ecSDave Kleikamp qname = match_strdup(&args[0]); 1206ac27a0ecSDave Kleikamp if (!qname) { 1207ac27a0ecSDave Kleikamp printk(KERN_ERR 1208617ba13bSMingming Cao "EXT4-fs: not enough memory for " 1209ac27a0ecSDave Kleikamp "storing quotafile name.\n"); 1210ac27a0ecSDave Kleikamp return 0; 1211ac27a0ecSDave Kleikamp } 1212ac27a0ecSDave Kleikamp if (sbi->s_qf_names[qtype] && 1213ac27a0ecSDave Kleikamp strcmp(sbi->s_qf_names[qtype], qname)) { 1214ac27a0ecSDave Kleikamp printk(KERN_ERR 1215617ba13bSMingming Cao "EXT4-fs: %s quota file already " 1216ac27a0ecSDave Kleikamp "specified.\n", QTYPE2NAME(qtype)); 1217ac27a0ecSDave Kleikamp kfree(qname); 1218ac27a0ecSDave Kleikamp return 0; 1219ac27a0ecSDave Kleikamp } 1220ac27a0ecSDave Kleikamp sbi->s_qf_names[qtype] = qname; 1221ac27a0ecSDave Kleikamp if (strchr(sbi->s_qf_names[qtype], '/')) { 1222ac27a0ecSDave Kleikamp printk(KERN_ERR 1223617ba13bSMingming Cao "EXT4-fs: quotafile must be on " 1224ac27a0ecSDave Kleikamp "filesystem root.\n"); 1225ac27a0ecSDave Kleikamp kfree(sbi->s_qf_names[qtype]); 1226ac27a0ecSDave Kleikamp sbi->s_qf_names[qtype] = NULL; 1227ac27a0ecSDave Kleikamp return 0; 1228ac27a0ecSDave Kleikamp } 1229ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, QUOTA); 1230ac27a0ecSDave Kleikamp break; 1231ac27a0ecSDave Kleikamp case Opt_offusrjquota: 1232ac27a0ecSDave Kleikamp qtype = USRQUOTA; 1233ac27a0ecSDave Kleikamp goto clear_qf_name; 1234ac27a0ecSDave Kleikamp case Opt_offgrpjquota: 1235ac27a0ecSDave Kleikamp qtype = GRPQUOTA; 1236ac27a0ecSDave Kleikamp clear_qf_name: 1237dfc5d03fSJan Kara if ((sb_any_quota_enabled(sb) || 1238dfc5d03fSJan Kara sb_any_quota_suspended(sb)) && 1239dfc5d03fSJan Kara sbi->s_qf_names[qtype]) { 1240617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: Cannot change " 12412c8be6b2SJan Kara "journaled quota options when " 1242ac27a0ecSDave Kleikamp "quota turned on.\n"); 1243ac27a0ecSDave Kleikamp return 0; 1244ac27a0ecSDave Kleikamp } 1245ac27a0ecSDave Kleikamp /* 1246ac27a0ecSDave Kleikamp * The space will be released later when all options 1247ac27a0ecSDave Kleikamp * are confirmed to be correct 1248ac27a0ecSDave Kleikamp */ 1249ac27a0ecSDave Kleikamp sbi->s_qf_names[qtype] = NULL; 1250ac27a0ecSDave Kleikamp break; 1251ac27a0ecSDave Kleikamp case Opt_jqfmt_vfsold: 1252dfc5d03fSJan Kara qfmt = QFMT_VFS_OLD; 1253dfc5d03fSJan Kara goto set_qf_format; 1254ac27a0ecSDave Kleikamp case Opt_jqfmt_vfsv0: 1255dfc5d03fSJan Kara qfmt = QFMT_VFS_V0; 1256dfc5d03fSJan Kara set_qf_format: 1257dfc5d03fSJan Kara if ((sb_any_quota_enabled(sb) || 1258dfc5d03fSJan Kara sb_any_quota_suspended(sb)) && 1259dfc5d03fSJan Kara sbi->s_jquota_fmt != qfmt) { 1260dfc5d03fSJan Kara printk(KERN_ERR "EXT4-fs: Cannot change " 1261dfc5d03fSJan Kara "journaled quota options when " 1262dfc5d03fSJan Kara "quota turned on.\n"); 1263dfc5d03fSJan Kara return 0; 1264dfc5d03fSJan Kara } 1265dfc5d03fSJan Kara sbi->s_jquota_fmt = qfmt; 1266ac27a0ecSDave Kleikamp break; 1267ac27a0ecSDave Kleikamp case Opt_quota: 1268ac27a0ecSDave Kleikamp case Opt_usrquota: 1269ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, QUOTA); 1270ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, USRQUOTA); 1271ac27a0ecSDave Kleikamp break; 1272ac27a0ecSDave Kleikamp case Opt_grpquota: 1273ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, QUOTA); 1274ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, GRPQUOTA); 1275ac27a0ecSDave Kleikamp break; 1276ac27a0ecSDave Kleikamp case Opt_noquota: 1277ac27a0ecSDave Kleikamp if (sb_any_quota_enabled(sb)) { 1278617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: Cannot change quota " 1279ac27a0ecSDave Kleikamp "options when quota turned on.\n"); 1280ac27a0ecSDave Kleikamp return 0; 1281ac27a0ecSDave Kleikamp } 1282ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, QUOTA); 1283ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, USRQUOTA); 1284ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, GRPQUOTA); 1285ac27a0ecSDave Kleikamp break; 1286ac27a0ecSDave Kleikamp #else 1287ac27a0ecSDave Kleikamp case Opt_quota: 1288ac27a0ecSDave Kleikamp case Opt_usrquota: 1289ac27a0ecSDave Kleikamp case Opt_grpquota: 1290cd59e7b9SJan Kara printk(KERN_ERR 1291cd59e7b9SJan Kara "EXT4-fs: quota options not supported.\n"); 1292cd59e7b9SJan Kara break; 1293ac27a0ecSDave Kleikamp case Opt_usrjquota: 1294ac27a0ecSDave Kleikamp case Opt_grpjquota: 1295ac27a0ecSDave Kleikamp case Opt_offusrjquota: 1296ac27a0ecSDave Kleikamp case Opt_offgrpjquota: 1297ac27a0ecSDave Kleikamp case Opt_jqfmt_vfsold: 1298ac27a0ecSDave Kleikamp case Opt_jqfmt_vfsv0: 1299ac27a0ecSDave Kleikamp printk(KERN_ERR 1300cd59e7b9SJan Kara "EXT4-fs: journaled quota options not " 1301ac27a0ecSDave Kleikamp "supported.\n"); 1302ac27a0ecSDave Kleikamp break; 1303ac27a0ecSDave Kleikamp case Opt_noquota: 1304ac27a0ecSDave Kleikamp break; 1305ac27a0ecSDave Kleikamp #endif 1306ac27a0ecSDave Kleikamp case Opt_abort: 1307ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, ABORT); 1308ac27a0ecSDave Kleikamp break; 1309ac27a0ecSDave Kleikamp case Opt_barrier: 1310ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 1311ac27a0ecSDave Kleikamp return 0; 1312ac27a0ecSDave Kleikamp if (option) 1313ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, BARRIER); 1314ac27a0ecSDave Kleikamp else 1315ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, BARRIER); 1316ac27a0ecSDave Kleikamp break; 1317ac27a0ecSDave Kleikamp case Opt_ignore: 1318ac27a0ecSDave Kleikamp break; 1319ac27a0ecSDave Kleikamp case Opt_resize: 1320ac27a0ecSDave Kleikamp if (!is_remount) { 1321617ba13bSMingming Cao printk("EXT4-fs: resize option only available " 1322ac27a0ecSDave Kleikamp "for remount\n"); 1323ac27a0ecSDave Kleikamp return 0; 1324ac27a0ecSDave Kleikamp } 1325ac27a0ecSDave Kleikamp if (match_int(&args[0], &option) != 0) 1326ac27a0ecSDave Kleikamp return 0; 1327ac27a0ecSDave Kleikamp *n_blocks_count = option; 1328ac27a0ecSDave Kleikamp break; 1329ac27a0ecSDave Kleikamp case Opt_nobh: 1330ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, NOBH); 1331ac27a0ecSDave Kleikamp break; 1332ac27a0ecSDave Kleikamp case Opt_bh: 1333ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, NOBH); 1334ac27a0ecSDave Kleikamp break; 1335a86c6181SAlex Tomas case Opt_extents: 1336e4079a11SEric Sandeen if (!EXT4_HAS_INCOMPAT_FEATURE(sb, 1337e4079a11SEric Sandeen EXT4_FEATURE_INCOMPAT_EXTENTS)) { 1338e4079a11SEric Sandeen ext4_warning(sb, __func__, 1339e4079a11SEric Sandeen "extents feature not enabled " 1340fde4d95aSTheodore Ts'o "on this filesystem, use tune2fs"); 1341e4079a11SEric Sandeen return 0; 1342e4079a11SEric Sandeen } 1343a86c6181SAlex Tomas set_opt(sbi->s_mount_opt, EXTENTS); 1344a86c6181SAlex Tomas break; 13451e2462f9SMingming Cao case Opt_noextents: 1346c07651b5SAneesh Kumar K.V /* 1347c07651b5SAneesh Kumar K.V * When e2fsprogs support resizing an already existing 1348c07651b5SAneesh Kumar K.V * ext3 file system to greater than 2**32 we need to 1349c07651b5SAneesh Kumar K.V * add support to block allocator to handle growing 1350c07651b5SAneesh Kumar K.V * already existing block mapped inode so that blocks 1351c07651b5SAneesh Kumar K.V * allocated for them fall within 2**32 1352c07651b5SAneesh Kumar K.V */ 1353c07651b5SAneesh Kumar K.V last_block = ext4_blocks_count(sbi->s_es) - 1; 1354c07651b5SAneesh Kumar K.V if (last_block > 0xffffffffULL) { 1355c07651b5SAneesh Kumar K.V printk(KERN_ERR "EXT4-fs: Filesystem too " 1356c07651b5SAneesh Kumar K.V "large to mount with " 1357c07651b5SAneesh Kumar K.V "-o noextents options\n"); 1358c07651b5SAneesh Kumar K.V return 0; 1359c07651b5SAneesh Kumar K.V } 13601e2462f9SMingming Cao clear_opt(sbi->s_mount_opt, EXTENTS); 13611e2462f9SMingming Cao break; 136225ec56b5SJean Noel Cordenner case Opt_i_version: 136325ec56b5SJean Noel Cordenner set_opt(sbi->s_mount_opt, I_VERSION); 136425ec56b5SJean Noel Cordenner sb->s_flags |= MS_I_VERSION; 136525ec56b5SJean Noel Cordenner break; 1366dd919b98SAneesh Kumar K.V case Opt_nodelalloc: 1367dd919b98SAneesh Kumar K.V clear_opt(sbi->s_mount_opt, DELALLOC); 1368dd919b98SAneesh Kumar K.V break; 1369c9de560dSAlex Tomas case Opt_stripe: 1370c9de560dSAlex Tomas if (match_int(&args[0], &option)) 1371c9de560dSAlex Tomas return 0; 1372c9de560dSAlex Tomas if (option < 0) 1373c9de560dSAlex Tomas return 0; 1374c9de560dSAlex Tomas sbi->s_stripe = option; 1375c9de560dSAlex Tomas break; 137664769240SAlex Tomas case Opt_delalloc: 137764769240SAlex Tomas set_opt(sbi->s_mount_opt, DELALLOC); 137864769240SAlex Tomas break; 1379240799cdSTheodore Ts'o case Opt_inode_readahead_blks: 1380240799cdSTheodore Ts'o if (match_int(&args[0], &option)) 1381240799cdSTheodore Ts'o return 0; 1382240799cdSTheodore Ts'o if (option < 0 || option > (1 << 30)) 1383240799cdSTheodore Ts'o return 0; 1384240799cdSTheodore Ts'o sbi->s_inode_readahead_blks = option; 1385240799cdSTheodore Ts'o break; 1386ac27a0ecSDave Kleikamp default: 1387ac27a0ecSDave Kleikamp printk(KERN_ERR 1388617ba13bSMingming Cao "EXT4-fs: Unrecognized mount option \"%s\" " 1389ac27a0ecSDave Kleikamp "or missing value\n", p); 1390ac27a0ecSDave Kleikamp return 0; 1391ac27a0ecSDave Kleikamp } 1392ac27a0ecSDave Kleikamp } 1393ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1394ac27a0ecSDave Kleikamp if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { 1395617ba13bSMingming Cao if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) && 1396ac27a0ecSDave Kleikamp sbi->s_qf_names[USRQUOTA]) 1397ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, USRQUOTA); 1398ac27a0ecSDave Kleikamp 1399617ba13bSMingming Cao if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) && 1400ac27a0ecSDave Kleikamp sbi->s_qf_names[GRPQUOTA]) 1401ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, GRPQUOTA); 1402ac27a0ecSDave Kleikamp 1403ac27a0ecSDave Kleikamp if ((sbi->s_qf_names[USRQUOTA] && 1404617ba13bSMingming Cao (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) || 1405ac27a0ecSDave Kleikamp (sbi->s_qf_names[GRPQUOTA] && 1406617ba13bSMingming Cao (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) { 1407617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: old and new quota " 1408ac27a0ecSDave Kleikamp "format mixing.\n"); 1409ac27a0ecSDave Kleikamp return 0; 1410ac27a0ecSDave Kleikamp } 1411ac27a0ecSDave Kleikamp 1412ac27a0ecSDave Kleikamp if (!sbi->s_jquota_fmt) { 14132c8be6b2SJan Kara printk(KERN_ERR "EXT4-fs: journaled quota format " 1414ac27a0ecSDave Kleikamp "not specified.\n"); 1415ac27a0ecSDave Kleikamp return 0; 1416ac27a0ecSDave Kleikamp } 1417ac27a0ecSDave Kleikamp } else { 1418ac27a0ecSDave Kleikamp if (sbi->s_jquota_fmt) { 14192c8be6b2SJan Kara printk(KERN_ERR "EXT4-fs: journaled quota format " 14202c8be6b2SJan Kara "specified with no journaling " 1421ac27a0ecSDave Kleikamp "enabled.\n"); 1422ac27a0ecSDave Kleikamp return 0; 1423ac27a0ecSDave Kleikamp } 1424ac27a0ecSDave Kleikamp } 1425ac27a0ecSDave Kleikamp #endif 1426ac27a0ecSDave Kleikamp return 1; 1427ac27a0ecSDave Kleikamp } 1428ac27a0ecSDave Kleikamp 1429617ba13bSMingming Cao static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, 1430ac27a0ecSDave Kleikamp int read_only) 1431ac27a0ecSDave Kleikamp { 1432617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 1433ac27a0ecSDave Kleikamp int res = 0; 1434ac27a0ecSDave Kleikamp 1435617ba13bSMingming Cao if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { 1436617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs warning: revision level too high, " 1437ac27a0ecSDave Kleikamp "forcing read-only mode\n"); 1438ac27a0ecSDave Kleikamp res = MS_RDONLY; 1439ac27a0ecSDave Kleikamp } 1440ac27a0ecSDave Kleikamp if (read_only) 1441ac27a0ecSDave Kleikamp return res; 1442617ba13bSMingming Cao if (!(sbi->s_mount_state & EXT4_VALID_FS)) 1443617ba13bSMingming Cao printk(KERN_WARNING "EXT4-fs warning: mounting unchecked fs, " 1444ac27a0ecSDave Kleikamp "running e2fsck is recommended\n"); 1445617ba13bSMingming Cao else if ((sbi->s_mount_state & EXT4_ERROR_FS)) 1446ac27a0ecSDave Kleikamp printk(KERN_WARNING 1447617ba13bSMingming Cao "EXT4-fs warning: mounting fs with errors, " 1448ac27a0ecSDave Kleikamp "running e2fsck is recommended\n"); 1449ac27a0ecSDave Kleikamp else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 1450ac27a0ecSDave Kleikamp le16_to_cpu(es->s_mnt_count) >= 1451ac27a0ecSDave Kleikamp (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 1452ac27a0ecSDave Kleikamp printk(KERN_WARNING 1453617ba13bSMingming Cao "EXT4-fs warning: maximal mount count reached, " 1454ac27a0ecSDave Kleikamp "running e2fsck is recommended\n"); 1455ac27a0ecSDave Kleikamp else if (le32_to_cpu(es->s_checkinterval) && 1456ac27a0ecSDave Kleikamp (le32_to_cpu(es->s_lastcheck) + 1457ac27a0ecSDave Kleikamp le32_to_cpu(es->s_checkinterval) <= get_seconds())) 1458ac27a0ecSDave Kleikamp printk(KERN_WARNING 1459617ba13bSMingming Cao "EXT4-fs warning: checktime reached, " 1460ac27a0ecSDave Kleikamp "running e2fsck is recommended\n"); 14610390131bSFrank Mayhar if (!sbi->s_journal) 1462216c34b2SMarcin Slusarz es->s_state &= cpu_to_le16(~EXT4_VALID_FS); 1463ac27a0ecSDave Kleikamp if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) 1464617ba13bSMingming Cao es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); 1465e8546d06SMarcin Slusarz le16_add_cpu(&es->s_mnt_count, 1); 1466ac27a0ecSDave Kleikamp es->s_mtime = cpu_to_le32(get_seconds()); 1467617ba13bSMingming Cao ext4_update_dynamic_rev(sb); 14680390131bSFrank Mayhar if (sbi->s_journal) 1469617ba13bSMingming Cao EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 1470ac27a0ecSDave Kleikamp 1471617ba13bSMingming Cao ext4_commit_super(sb, es, 1); 1472ac27a0ecSDave Kleikamp if (test_opt(sb, DEBUG)) 1473617ba13bSMingming Cao printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, " 1474ac27a0ecSDave Kleikamp "bpg=%lu, ipg=%lu, mo=%04lx]\n", 1475ac27a0ecSDave Kleikamp sb->s_blocksize, 1476ac27a0ecSDave Kleikamp sbi->s_groups_count, 1477617ba13bSMingming Cao EXT4_BLOCKS_PER_GROUP(sb), 1478617ba13bSMingming Cao EXT4_INODES_PER_GROUP(sb), 1479ac27a0ecSDave Kleikamp sbi->s_mount_opt); 1480ac27a0ecSDave Kleikamp 14810390131bSFrank Mayhar if (EXT4_SB(sb)->s_journal) { 148205496769STheodore Ts'o printk(KERN_INFO "EXT4 FS on %s, %s journal on %s\n", 148305496769STheodore Ts'o sb->s_id, EXT4_SB(sb)->s_journal->j_inode ? "internal" : 148405496769STheodore Ts'o "external", EXT4_SB(sb)->s_journal->j_devname); 14850390131bSFrank Mayhar } else { 14860390131bSFrank Mayhar printk(KERN_INFO "EXT4 FS on %s, no journal\n", sb->s_id); 14870390131bSFrank Mayhar } 1488ac27a0ecSDave Kleikamp return res; 1489ac27a0ecSDave Kleikamp } 1490ac27a0ecSDave Kleikamp 1491772cb7c8SJose R. Santos static int ext4_fill_flex_info(struct super_block *sb) 1492772cb7c8SJose R. Santos { 1493772cb7c8SJose R. Santos struct ext4_sb_info *sbi = EXT4_SB(sb); 1494772cb7c8SJose R. Santos struct ext4_group_desc *gdp = NULL; 1495772cb7c8SJose R. Santos struct buffer_head *bh; 1496772cb7c8SJose R. Santos ext4_group_t flex_group_count; 1497772cb7c8SJose R. Santos ext4_group_t flex_group; 1498772cb7c8SJose R. Santos int groups_per_flex = 0; 1499772cb7c8SJose R. Santos int i; 1500772cb7c8SJose R. Santos 1501772cb7c8SJose R. Santos if (!sbi->s_es->s_log_groups_per_flex) { 1502772cb7c8SJose R. Santos sbi->s_log_groups_per_flex = 0; 1503772cb7c8SJose R. Santos return 1; 1504772cb7c8SJose R. Santos } 1505772cb7c8SJose R. Santos 1506772cb7c8SJose R. Santos sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex; 1507772cb7c8SJose R. Santos groups_per_flex = 1 << sbi->s_log_groups_per_flex; 1508772cb7c8SJose R. Santos 1509c62a11fdSFrederic Bohe /* We allocate both existing and potentially added groups */ 1510c62a11fdSFrederic Bohe flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) + 1511d94e99a6SAneesh Kumar K.V ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) << 1512d94e99a6SAneesh Kumar K.V EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex; 1513ec05e868SLi Zefan sbi->s_flex_groups = kzalloc(flex_group_count * 1514772cb7c8SJose R. Santos sizeof(struct flex_groups), GFP_KERNEL); 1515772cb7c8SJose R. Santos if (sbi->s_flex_groups == NULL) { 1516ec05e868SLi Zefan printk(KERN_ERR "EXT4-fs: not enough memory for " 1517ec05e868SLi Zefan "%lu flex groups\n", flex_group_count); 1518772cb7c8SJose R. Santos goto failed; 1519772cb7c8SJose R. Santos } 1520772cb7c8SJose R. Santos 1521772cb7c8SJose R. Santos for (i = 0; i < sbi->s_groups_count; i++) { 1522772cb7c8SJose R. Santos gdp = ext4_get_group_desc(sb, i, &bh); 1523772cb7c8SJose R. Santos 1524772cb7c8SJose R. Santos flex_group = ext4_flex_group(sbi, i); 1525772cb7c8SJose R. Santos sbi->s_flex_groups[flex_group].free_inodes += 1526772cb7c8SJose R. Santos le16_to_cpu(gdp->bg_free_inodes_count); 1527772cb7c8SJose R. Santos sbi->s_flex_groups[flex_group].free_blocks += 1528772cb7c8SJose R. Santos le16_to_cpu(gdp->bg_free_blocks_count); 1529772cb7c8SJose R. Santos } 1530772cb7c8SJose R. Santos 1531772cb7c8SJose R. Santos return 1; 1532772cb7c8SJose R. Santos failed: 1533772cb7c8SJose R. Santos return 0; 1534772cb7c8SJose R. Santos } 1535772cb7c8SJose R. Santos 1536717d50e4SAndreas Dilger __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group, 1537717d50e4SAndreas Dilger struct ext4_group_desc *gdp) 1538717d50e4SAndreas Dilger { 1539717d50e4SAndreas Dilger __u16 crc = 0; 1540717d50e4SAndreas Dilger 1541717d50e4SAndreas Dilger if (sbi->s_es->s_feature_ro_compat & 1542717d50e4SAndreas Dilger cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { 1543717d50e4SAndreas Dilger int offset = offsetof(struct ext4_group_desc, bg_checksum); 1544717d50e4SAndreas Dilger __le32 le_group = cpu_to_le32(block_group); 1545717d50e4SAndreas Dilger 1546717d50e4SAndreas Dilger crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); 1547717d50e4SAndreas Dilger crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); 1548717d50e4SAndreas Dilger crc = crc16(crc, (__u8 *)gdp, offset); 1549717d50e4SAndreas Dilger offset += sizeof(gdp->bg_checksum); /* skip checksum */ 1550717d50e4SAndreas Dilger /* for checksum of struct ext4_group_desc do the rest...*/ 1551717d50e4SAndreas Dilger if ((sbi->s_es->s_feature_incompat & 1552717d50e4SAndreas Dilger cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) && 1553717d50e4SAndreas Dilger offset < le16_to_cpu(sbi->s_es->s_desc_size)) 1554717d50e4SAndreas Dilger crc = crc16(crc, (__u8 *)gdp + offset, 1555717d50e4SAndreas Dilger le16_to_cpu(sbi->s_es->s_desc_size) - 1556717d50e4SAndreas Dilger offset); 1557717d50e4SAndreas Dilger } 1558717d50e4SAndreas Dilger 1559717d50e4SAndreas Dilger return cpu_to_le16(crc); 1560717d50e4SAndreas Dilger } 1561717d50e4SAndreas Dilger 1562717d50e4SAndreas Dilger int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group, 1563717d50e4SAndreas Dilger struct ext4_group_desc *gdp) 1564717d50e4SAndreas Dilger { 1565717d50e4SAndreas Dilger if ((sbi->s_es->s_feature_ro_compat & 1566717d50e4SAndreas Dilger cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) && 1567717d50e4SAndreas Dilger (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp))) 1568717d50e4SAndreas Dilger return 0; 1569717d50e4SAndreas Dilger 1570717d50e4SAndreas Dilger return 1; 1571717d50e4SAndreas Dilger } 1572717d50e4SAndreas Dilger 1573ac27a0ecSDave Kleikamp /* Called at mount-time, super-block is locked */ 1574617ba13bSMingming Cao static int ext4_check_descriptors(struct super_block *sb) 1575ac27a0ecSDave Kleikamp { 1576617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 1577617ba13bSMingming Cao ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); 1578617ba13bSMingming Cao ext4_fsblk_t last_block; 1579bd81d8eeSLaurent Vivier ext4_fsblk_t block_bitmap; 1580bd81d8eeSLaurent Vivier ext4_fsblk_t inode_bitmap; 1581bd81d8eeSLaurent Vivier ext4_fsblk_t inode_table; 1582ce421581SJose R. Santos int flexbg_flag = 0; 1583fd2d4291SAvantika Mathur ext4_group_t i; 1584ac27a0ecSDave Kleikamp 1585ce421581SJose R. Santos if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 1586ce421581SJose R. Santos flexbg_flag = 1; 1587ce421581SJose R. Santos 1588617ba13bSMingming Cao ext4_debug("Checking group descriptors"); 1589ac27a0ecSDave Kleikamp 1590197cd65aSAkinobu Mita for (i = 0; i < sbi->s_groups_count; i++) { 1591197cd65aSAkinobu Mita struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); 1592197cd65aSAkinobu Mita 1593ce421581SJose R. Santos if (i == sbi->s_groups_count - 1 || flexbg_flag) 1594bd81d8eeSLaurent Vivier last_block = ext4_blocks_count(sbi->s_es) - 1; 1595ac27a0ecSDave Kleikamp else 1596ac27a0ecSDave Kleikamp last_block = first_block + 1597617ba13bSMingming Cao (EXT4_BLOCKS_PER_GROUP(sb) - 1); 1598ac27a0ecSDave Kleikamp 15998fadc143SAlexandre Ratchov block_bitmap = ext4_block_bitmap(sb, gdp); 16002b2d6d01STheodore Ts'o if (block_bitmap < first_block || block_bitmap > last_block) { 1601c19204b0SJosef Bacik printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " 1602c19204b0SJosef Bacik "Block bitmap for group %lu not in group " 16035128273aSEric Sesterhenn "(block %llu)!\n", i, block_bitmap); 1604ac27a0ecSDave Kleikamp return 0; 1605ac27a0ecSDave Kleikamp } 16068fadc143SAlexandre Ratchov inode_bitmap = ext4_inode_bitmap(sb, gdp); 16072b2d6d01STheodore Ts'o if (inode_bitmap < first_block || inode_bitmap > last_block) { 1608c19204b0SJosef Bacik printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " 1609c19204b0SJosef Bacik "Inode bitmap for group %lu not in group " 16105128273aSEric Sesterhenn "(block %llu)!\n", i, inode_bitmap); 1611ac27a0ecSDave Kleikamp return 0; 1612ac27a0ecSDave Kleikamp } 16138fadc143SAlexandre Ratchov inode_table = ext4_inode_table(sb, gdp); 1614bd81d8eeSLaurent Vivier if (inode_table < first_block || 16152b2d6d01STheodore Ts'o inode_table + sbi->s_itb_per_group - 1 > last_block) { 1616c19204b0SJosef Bacik printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " 1617c19204b0SJosef Bacik "Inode table for group %lu not in group " 16185128273aSEric Sesterhenn "(block %llu)!\n", i, inode_table); 1619ac27a0ecSDave Kleikamp return 0; 1620ac27a0ecSDave Kleikamp } 1621b5f10eedSEric Sandeen spin_lock(sb_bgl_lock(sbi, i)); 1622717d50e4SAndreas Dilger if (!ext4_group_desc_csum_verify(sbi, i, gdp)) { 1623c19204b0SJosef Bacik printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " 1624fd2d4291SAvantika Mathur "Checksum for group %lu failed (%u!=%u)\n", 1625fd2d4291SAvantika Mathur i, le16_to_cpu(ext4_group_desc_csum(sbi, i, 1626fd2d4291SAvantika Mathur gdp)), le16_to_cpu(gdp->bg_checksum)); 16277ee1ec4cSLi Zefan if (!(sb->s_flags & MS_RDONLY)) { 16287ee1ec4cSLi Zefan spin_unlock(sb_bgl_lock(sbi, i)); 1629717d50e4SAndreas Dilger return 0; 1630717d50e4SAndreas Dilger } 16317ee1ec4cSLi Zefan } 1632b5f10eedSEric Sandeen spin_unlock(sb_bgl_lock(sbi, i)); 1633ce421581SJose R. Santos if (!flexbg_flag) 1634617ba13bSMingming Cao first_block += EXT4_BLOCKS_PER_GROUP(sb); 1635ac27a0ecSDave Kleikamp } 1636ac27a0ecSDave Kleikamp 1637bd81d8eeSLaurent Vivier ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb)); 1638617ba13bSMingming Cao sbi->s_es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb)); 1639ac27a0ecSDave Kleikamp return 1; 1640ac27a0ecSDave Kleikamp } 1641ac27a0ecSDave Kleikamp 1642617ba13bSMingming Cao /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at 1643ac27a0ecSDave Kleikamp * the superblock) which were deleted from all directories, but held open by 1644ac27a0ecSDave Kleikamp * a process at the time of a crash. We walk the list and try to delete these 1645ac27a0ecSDave Kleikamp * inodes at recovery time (only with a read-write filesystem). 1646ac27a0ecSDave Kleikamp * 1647ac27a0ecSDave Kleikamp * In order to keep the orphan inode chain consistent during traversal (in 1648ac27a0ecSDave Kleikamp * case of crash during recovery), we link each inode into the superblock 1649ac27a0ecSDave Kleikamp * orphan list_head and handle it the same way as an inode deletion during 1650ac27a0ecSDave Kleikamp * normal operation (which journals the operations for us). 1651ac27a0ecSDave Kleikamp * 1652ac27a0ecSDave Kleikamp * We only do an iget() and an iput() on each inode, which is very safe if we 1653ac27a0ecSDave Kleikamp * accidentally point at an in-use or already deleted inode. The worst that 1654ac27a0ecSDave Kleikamp * can happen in this case is that we get a "bit already cleared" message from 1655617ba13bSMingming Cao * ext4_free_inode(). The only reason we would point at a wrong inode is if 1656ac27a0ecSDave Kleikamp * e2fsck was run on this filesystem, and it must have already done the orphan 1657ac27a0ecSDave Kleikamp * inode cleanup for us, so we can safely abort without any further action. 1658ac27a0ecSDave Kleikamp */ 1659617ba13bSMingming Cao static void ext4_orphan_cleanup(struct super_block *sb, 1660617ba13bSMingming Cao struct ext4_super_block *es) 1661ac27a0ecSDave Kleikamp { 1662ac27a0ecSDave Kleikamp unsigned int s_flags = sb->s_flags; 1663ac27a0ecSDave Kleikamp int nr_orphans = 0, nr_truncates = 0; 1664ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1665ac27a0ecSDave Kleikamp int i; 1666ac27a0ecSDave Kleikamp #endif 1667ac27a0ecSDave Kleikamp if (!es->s_last_orphan) { 1668ac27a0ecSDave Kleikamp jbd_debug(4, "no orphan inodes to clean up\n"); 1669ac27a0ecSDave Kleikamp return; 1670ac27a0ecSDave Kleikamp } 1671ac27a0ecSDave Kleikamp 1672a8f48a95SEric Sandeen if (bdev_read_only(sb->s_bdev)) { 1673a8f48a95SEric Sandeen printk(KERN_ERR "EXT4-fs: write access " 1674a8f48a95SEric Sandeen "unavailable, skipping orphan cleanup.\n"); 1675a8f48a95SEric Sandeen return; 1676a8f48a95SEric Sandeen } 1677a8f48a95SEric Sandeen 1678617ba13bSMingming Cao if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { 1679ac27a0ecSDave Kleikamp if (es->s_last_orphan) 1680ac27a0ecSDave Kleikamp jbd_debug(1, "Errors on filesystem, " 1681ac27a0ecSDave Kleikamp "clearing orphan list.\n"); 1682ac27a0ecSDave Kleikamp es->s_last_orphan = 0; 1683ac27a0ecSDave Kleikamp jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); 1684ac27a0ecSDave Kleikamp return; 1685ac27a0ecSDave Kleikamp } 1686ac27a0ecSDave Kleikamp 1687ac27a0ecSDave Kleikamp if (s_flags & MS_RDONLY) { 1688617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n", 1689ac27a0ecSDave Kleikamp sb->s_id); 1690ac27a0ecSDave Kleikamp sb->s_flags &= ~MS_RDONLY; 1691ac27a0ecSDave Kleikamp } 1692ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1693ac27a0ecSDave Kleikamp /* Needed for iput() to work correctly and not trash data */ 1694ac27a0ecSDave Kleikamp sb->s_flags |= MS_ACTIVE; 1695ac27a0ecSDave Kleikamp /* Turn on quotas so that they are updated correctly */ 1696ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) { 1697617ba13bSMingming Cao if (EXT4_SB(sb)->s_qf_names[i]) { 1698617ba13bSMingming Cao int ret = ext4_quota_on_mount(sb, i); 1699ac27a0ecSDave Kleikamp if (ret < 0) 1700ac27a0ecSDave Kleikamp printk(KERN_ERR 17012c8be6b2SJan Kara "EXT4-fs: Cannot turn on journaled " 1702ac27a0ecSDave Kleikamp "quota: error %d\n", ret); 1703ac27a0ecSDave Kleikamp } 1704ac27a0ecSDave Kleikamp } 1705ac27a0ecSDave Kleikamp #endif 1706ac27a0ecSDave Kleikamp 1707ac27a0ecSDave Kleikamp while (es->s_last_orphan) { 1708ac27a0ecSDave Kleikamp struct inode *inode; 1709ac27a0ecSDave Kleikamp 171097bd42b9SJosef Bacik inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); 171197bd42b9SJosef Bacik if (IS_ERR(inode)) { 1712ac27a0ecSDave Kleikamp es->s_last_orphan = 0; 1713ac27a0ecSDave Kleikamp break; 1714ac27a0ecSDave Kleikamp } 1715ac27a0ecSDave Kleikamp 1716617ba13bSMingming Cao list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); 1717ac27a0ecSDave Kleikamp DQUOT_INIT(inode); 1718ac27a0ecSDave Kleikamp if (inode->i_nlink) { 1719ac27a0ecSDave Kleikamp printk(KERN_DEBUG 1720e5f8eab8STheodore Ts'o "%s: truncating inode %lu to %lld bytes\n", 172146e665e9SHarvey Harrison __func__, inode->i_ino, inode->i_size); 1722e5f8eab8STheodore Ts'o jbd_debug(2, "truncating inode %lu to %lld bytes\n", 1723ac27a0ecSDave Kleikamp inode->i_ino, inode->i_size); 1724617ba13bSMingming Cao ext4_truncate(inode); 1725ac27a0ecSDave Kleikamp nr_truncates++; 1726ac27a0ecSDave Kleikamp } else { 1727ac27a0ecSDave Kleikamp printk(KERN_DEBUG 1728ac27a0ecSDave Kleikamp "%s: deleting unreferenced inode %lu\n", 172946e665e9SHarvey Harrison __func__, inode->i_ino); 1730ac27a0ecSDave Kleikamp jbd_debug(2, "deleting unreferenced inode %lu\n", 1731ac27a0ecSDave Kleikamp inode->i_ino); 1732ac27a0ecSDave Kleikamp nr_orphans++; 1733ac27a0ecSDave Kleikamp } 1734ac27a0ecSDave Kleikamp iput(inode); /* The delete magic happens here! */ 1735ac27a0ecSDave Kleikamp } 1736ac27a0ecSDave Kleikamp 1737ac27a0ecSDave Kleikamp #define PLURAL(x) (x), ((x) == 1) ? "" : "s" 1738ac27a0ecSDave Kleikamp 1739ac27a0ecSDave Kleikamp if (nr_orphans) 1740617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n", 1741ac27a0ecSDave Kleikamp sb->s_id, PLURAL(nr_orphans)); 1742ac27a0ecSDave Kleikamp if (nr_truncates) 1743617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n", 1744ac27a0ecSDave Kleikamp sb->s_id, PLURAL(nr_truncates)); 1745ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1746ac27a0ecSDave Kleikamp /* Turn quotas off */ 1747ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) { 1748ac27a0ecSDave Kleikamp if (sb_dqopt(sb)->files[i]) 17496f28e087SJan Kara vfs_quota_off(sb, i, 0); 1750ac27a0ecSDave Kleikamp } 1751ac27a0ecSDave Kleikamp #endif 1752ac27a0ecSDave Kleikamp sb->s_flags = s_flags; /* Restore MS_RDONLY status */ 1753ac27a0ecSDave Kleikamp } 1754cd2291a4SEric Sandeen /* 1755cd2291a4SEric Sandeen * Maximal extent format file size. 1756cd2291a4SEric Sandeen * Resulting logical blkno at s_maxbytes must fit in our on-disk 1757cd2291a4SEric Sandeen * extent format containers, within a sector_t, and within i_blocks 1758cd2291a4SEric Sandeen * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, 1759cd2291a4SEric Sandeen * so that won't be a limiting factor. 1760cd2291a4SEric Sandeen * 1761cd2291a4SEric Sandeen * Note, this does *not* consider any metadata overhead for vfs i_blocks. 1762cd2291a4SEric Sandeen */ 1763f287a1a5STheodore Ts'o static loff_t ext4_max_size(int blkbits, int has_huge_files) 1764cd2291a4SEric Sandeen { 1765cd2291a4SEric Sandeen loff_t res; 1766cd2291a4SEric Sandeen loff_t upper_limit = MAX_LFS_FILESIZE; 1767cd2291a4SEric Sandeen 1768cd2291a4SEric Sandeen /* small i_blocks in vfs inode? */ 1769f287a1a5STheodore Ts'o if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { 1770cd2291a4SEric Sandeen /* 1771*b3a6ffe1SJens Axboe * CONFIG_LBD is not enabled implies the inode 1772cd2291a4SEric Sandeen * i_block represent total blocks in 512 bytes 1773cd2291a4SEric Sandeen * 32 == size of vfs inode i_blocks * 8 1774cd2291a4SEric Sandeen */ 1775cd2291a4SEric Sandeen upper_limit = (1LL << 32) - 1; 1776cd2291a4SEric Sandeen 1777cd2291a4SEric Sandeen /* total blocks in file system block size */ 1778cd2291a4SEric Sandeen upper_limit >>= (blkbits - 9); 1779cd2291a4SEric Sandeen upper_limit <<= blkbits; 1780cd2291a4SEric Sandeen } 1781cd2291a4SEric Sandeen 1782cd2291a4SEric Sandeen /* 32-bit extent-start container, ee_block */ 1783cd2291a4SEric Sandeen res = 1LL << 32; 1784cd2291a4SEric Sandeen res <<= blkbits; 1785cd2291a4SEric Sandeen res -= 1; 1786cd2291a4SEric Sandeen 1787cd2291a4SEric Sandeen /* Sanity check against vm- & vfs- imposed limits */ 1788cd2291a4SEric Sandeen if (res > upper_limit) 1789cd2291a4SEric Sandeen res = upper_limit; 1790cd2291a4SEric Sandeen 1791cd2291a4SEric Sandeen return res; 1792cd2291a4SEric Sandeen } 1793ac27a0ecSDave Kleikamp 1794ac27a0ecSDave Kleikamp /* 1795cd2291a4SEric Sandeen * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect 17960fc1b451SAneesh Kumar K.V * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. 17970fc1b451SAneesh Kumar K.V * We need to be 1 filesystem block less than the 2^48 sector limit. 1798ac27a0ecSDave Kleikamp */ 1799f287a1a5STheodore Ts'o static loff_t ext4_max_bitmap_size(int bits, int has_huge_files) 1800ac27a0ecSDave Kleikamp { 1801617ba13bSMingming Cao loff_t res = EXT4_NDIR_BLOCKS; 18020fc1b451SAneesh Kumar K.V int meta_blocks; 18030fc1b451SAneesh Kumar K.V loff_t upper_limit; 18040fc1b451SAneesh Kumar K.V /* This is calculated to be the largest file size for a 1805cd2291a4SEric Sandeen * dense, bitmapped file such that the total number of 1806ac27a0ecSDave Kleikamp * sectors in the file, including data and all indirect blocks, 18070fc1b451SAneesh Kumar K.V * does not exceed 2^48 -1 18080fc1b451SAneesh Kumar K.V * __u32 i_blocks_lo and _u16 i_blocks_high representing the 18090fc1b451SAneesh Kumar K.V * total number of 512 bytes blocks of the file 18100fc1b451SAneesh Kumar K.V */ 18110fc1b451SAneesh Kumar K.V 1812f287a1a5STheodore Ts'o if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { 18130fc1b451SAneesh Kumar K.V /* 1814*b3a6ffe1SJens Axboe * !has_huge_files or CONFIG_LBD is not enabled 1815f287a1a5STheodore Ts'o * implies the inode i_block represent total blocks in 1816f287a1a5STheodore Ts'o * 512 bytes 32 == size of vfs inode i_blocks * 8 18170fc1b451SAneesh Kumar K.V */ 18180fc1b451SAneesh Kumar K.V upper_limit = (1LL << 32) - 1; 18190fc1b451SAneesh Kumar K.V 18200fc1b451SAneesh Kumar K.V /* total blocks in file system block size */ 18210fc1b451SAneesh Kumar K.V upper_limit >>= (bits - 9); 18220fc1b451SAneesh Kumar K.V 18230fc1b451SAneesh Kumar K.V } else { 18248180a562SAneesh Kumar K.V /* 18258180a562SAneesh Kumar K.V * We use 48 bit ext4_inode i_blocks 18268180a562SAneesh Kumar K.V * With EXT4_HUGE_FILE_FL set the i_blocks 18278180a562SAneesh Kumar K.V * represent total number of blocks in 18288180a562SAneesh Kumar K.V * file system block size 18298180a562SAneesh Kumar K.V */ 18300fc1b451SAneesh Kumar K.V upper_limit = (1LL << 48) - 1; 18310fc1b451SAneesh Kumar K.V 18320fc1b451SAneesh Kumar K.V } 18330fc1b451SAneesh Kumar K.V 18340fc1b451SAneesh Kumar K.V /* indirect blocks */ 18350fc1b451SAneesh Kumar K.V meta_blocks = 1; 18360fc1b451SAneesh Kumar K.V /* double indirect blocks */ 18370fc1b451SAneesh Kumar K.V meta_blocks += 1 + (1LL << (bits-2)); 18380fc1b451SAneesh Kumar K.V /* tripple indirect blocks */ 18390fc1b451SAneesh Kumar K.V meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); 18400fc1b451SAneesh Kumar K.V 18410fc1b451SAneesh Kumar K.V upper_limit -= meta_blocks; 18420fc1b451SAneesh Kumar K.V upper_limit <<= bits; 1843ac27a0ecSDave Kleikamp 1844ac27a0ecSDave Kleikamp res += 1LL << (bits-2); 1845ac27a0ecSDave Kleikamp res += 1LL << (2*(bits-2)); 1846ac27a0ecSDave Kleikamp res += 1LL << (3*(bits-2)); 1847ac27a0ecSDave Kleikamp res <<= bits; 1848ac27a0ecSDave Kleikamp if (res > upper_limit) 1849ac27a0ecSDave Kleikamp res = upper_limit; 18500fc1b451SAneesh Kumar K.V 18510fc1b451SAneesh Kumar K.V if (res > MAX_LFS_FILESIZE) 18520fc1b451SAneesh Kumar K.V res = MAX_LFS_FILESIZE; 18530fc1b451SAneesh Kumar K.V 1854ac27a0ecSDave Kleikamp return res; 1855ac27a0ecSDave Kleikamp } 1856ac27a0ecSDave Kleikamp 1857617ba13bSMingming Cao static ext4_fsblk_t descriptor_loc(struct super_block *sb, 185870bbb3e0SAndrew Morton ext4_fsblk_t logical_sb_block, int nr) 1859ac27a0ecSDave Kleikamp { 1860617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 1861fd2d4291SAvantika Mathur ext4_group_t bg, first_meta_bg; 1862ac27a0ecSDave Kleikamp int has_super = 0; 1863ac27a0ecSDave Kleikamp 1864ac27a0ecSDave Kleikamp first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 1865ac27a0ecSDave Kleikamp 1866617ba13bSMingming Cao if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || 1867ac27a0ecSDave Kleikamp nr < first_meta_bg) 186870bbb3e0SAndrew Morton return logical_sb_block + nr + 1; 1869ac27a0ecSDave Kleikamp bg = sbi->s_desc_per_block * nr; 1870617ba13bSMingming Cao if (ext4_bg_has_super(sb, bg)) 1871ac27a0ecSDave Kleikamp has_super = 1; 1872617ba13bSMingming Cao return (has_super + ext4_group_first_block_no(sb, bg)); 1873ac27a0ecSDave Kleikamp } 1874ac27a0ecSDave Kleikamp 1875c9de560dSAlex Tomas /** 1876c9de560dSAlex Tomas * ext4_get_stripe_size: Get the stripe size. 1877c9de560dSAlex Tomas * @sbi: In memory super block info 1878c9de560dSAlex Tomas * 1879c9de560dSAlex Tomas * If we have specified it via mount option, then 1880c9de560dSAlex Tomas * use the mount option value. If the value specified at mount time is 1881c9de560dSAlex Tomas * greater than the blocks per group use the super block value. 1882c9de560dSAlex Tomas * If the super block value is greater than blocks per group return 0. 1883c9de560dSAlex Tomas * Allocator needs it be less than blocks per group. 1884c9de560dSAlex Tomas * 1885c9de560dSAlex Tomas */ 1886c9de560dSAlex Tomas static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) 1887c9de560dSAlex Tomas { 1888c9de560dSAlex Tomas unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); 1889c9de560dSAlex Tomas unsigned long stripe_width = 1890c9de560dSAlex Tomas le32_to_cpu(sbi->s_es->s_raid_stripe_width); 1891c9de560dSAlex Tomas 1892c9de560dSAlex Tomas if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) 1893c9de560dSAlex Tomas return sbi->s_stripe; 1894c9de560dSAlex Tomas 1895c9de560dSAlex Tomas if (stripe_width <= sbi->s_blocks_per_group) 1896c9de560dSAlex Tomas return stripe_width; 1897c9de560dSAlex Tomas 1898c9de560dSAlex Tomas if (stride <= sbi->s_blocks_per_group) 1899c9de560dSAlex Tomas return stride; 1900c9de560dSAlex Tomas 1901c9de560dSAlex Tomas return 0; 1902c9de560dSAlex Tomas } 1903ac27a0ecSDave Kleikamp 1904617ba13bSMingming Cao static int ext4_fill_super(struct super_block *sb, void *data, int silent) 19057477827fSAneesh Kumar K.V __releases(kernel_lock) 19067477827fSAneesh Kumar K.V __acquires(kernel_lock) 19071d03ec98SAneesh Kumar K.V 1908ac27a0ecSDave Kleikamp { 1909ac27a0ecSDave Kleikamp struct buffer_head *bh; 1910617ba13bSMingming Cao struct ext4_super_block *es = NULL; 1911617ba13bSMingming Cao struct ext4_sb_info *sbi; 1912617ba13bSMingming Cao ext4_fsblk_t block; 1913617ba13bSMingming Cao ext4_fsblk_t sb_block = get_sb_block(&data); 191470bbb3e0SAndrew Morton ext4_fsblk_t logical_sb_block; 1915ac27a0ecSDave Kleikamp unsigned long offset = 0; 1916ac27a0ecSDave Kleikamp unsigned int journal_inum = 0; 1917ac27a0ecSDave Kleikamp unsigned long journal_devnum = 0; 1918ac27a0ecSDave Kleikamp unsigned long def_mount_opts; 1919ac27a0ecSDave Kleikamp struct inode *root; 19209f6200bbSTheodore Ts'o char *cp; 19210390131bSFrank Mayhar const char *descr; 19221d1fe1eeSDavid Howells int ret = -EINVAL; 1923ac27a0ecSDave Kleikamp int blocksize; 1924ac27a0ecSDave Kleikamp int db_count; 1925ac27a0ecSDave Kleikamp int i; 1926f287a1a5STheodore Ts'o int needs_recovery, has_huge_files; 1927ac27a0ecSDave Kleikamp __le32 features; 1928bd81d8eeSLaurent Vivier __u64 blocks_count; 1929833f4077SPeter Zijlstra int err; 1930ac27a0ecSDave Kleikamp 1931ac27a0ecSDave Kleikamp sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 1932ac27a0ecSDave Kleikamp if (!sbi) 1933ac27a0ecSDave Kleikamp return -ENOMEM; 1934ac27a0ecSDave Kleikamp sb->s_fs_info = sbi; 1935ac27a0ecSDave Kleikamp sbi->s_mount_opt = 0; 1936617ba13bSMingming Cao sbi->s_resuid = EXT4_DEF_RESUID; 1937617ba13bSMingming Cao sbi->s_resgid = EXT4_DEF_RESGID; 1938240799cdSTheodore Ts'o sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS; 1939d9c9bef1SMiklos Szeredi sbi->s_sb_block = sb_block; 1940ac27a0ecSDave Kleikamp 1941ac27a0ecSDave Kleikamp unlock_kernel(); 1942ac27a0ecSDave Kleikamp 19439f6200bbSTheodore Ts'o /* Cleanup superblock name */ 19449f6200bbSTheodore Ts'o for (cp = sb->s_id; (cp = strchr(cp, '/'));) 19459f6200bbSTheodore Ts'o *cp = '!'; 19469f6200bbSTheodore Ts'o 1947617ba13bSMingming Cao blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); 1948ac27a0ecSDave Kleikamp if (!blocksize) { 1949617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: unable to set blocksize\n"); 1950ac27a0ecSDave Kleikamp goto out_fail; 1951ac27a0ecSDave Kleikamp } 1952ac27a0ecSDave Kleikamp 1953ac27a0ecSDave Kleikamp /* 1954617ba13bSMingming Cao * The ext4 superblock will not be buffer aligned for other than 1kB 1955ac27a0ecSDave Kleikamp * block sizes. We need to calculate the offset from buffer start. 1956ac27a0ecSDave Kleikamp */ 1957617ba13bSMingming Cao if (blocksize != EXT4_MIN_BLOCK_SIZE) { 195870bbb3e0SAndrew Morton logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 195970bbb3e0SAndrew Morton offset = do_div(logical_sb_block, blocksize); 1960ac27a0ecSDave Kleikamp } else { 196170bbb3e0SAndrew Morton logical_sb_block = sb_block; 1962ac27a0ecSDave Kleikamp } 1963ac27a0ecSDave Kleikamp 196470bbb3e0SAndrew Morton if (!(bh = sb_bread(sb, logical_sb_block))) { 1965617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: unable to read superblock\n"); 1966ac27a0ecSDave Kleikamp goto out_fail; 1967ac27a0ecSDave Kleikamp } 1968ac27a0ecSDave Kleikamp /* 1969ac27a0ecSDave Kleikamp * Note: s_es must be initialized as soon as possible because 1970617ba13bSMingming Cao * some ext4 macro-instructions depend on its value 1971ac27a0ecSDave Kleikamp */ 1972617ba13bSMingming Cao es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 1973ac27a0ecSDave Kleikamp sbi->s_es = es; 1974ac27a0ecSDave Kleikamp sb->s_magic = le16_to_cpu(es->s_magic); 1975617ba13bSMingming Cao if (sb->s_magic != EXT4_SUPER_MAGIC) 1976617ba13bSMingming Cao goto cantfind_ext4; 1977ac27a0ecSDave Kleikamp 1978ac27a0ecSDave Kleikamp /* Set defaults before we parse the mount options */ 1979ac27a0ecSDave Kleikamp def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 1980617ba13bSMingming Cao if (def_mount_opts & EXT4_DEFM_DEBUG) 1981ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, DEBUG); 1982617ba13bSMingming Cao if (def_mount_opts & EXT4_DEFM_BSDGROUPS) 1983ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, GRPID); 1984617ba13bSMingming Cao if (def_mount_opts & EXT4_DEFM_UID16) 1985ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, NO_UID32); 198603010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_XATTR 1987617ba13bSMingming Cao if (def_mount_opts & EXT4_DEFM_XATTR_USER) 1988ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, XATTR_USER); 19892e7842b8SHugh Dickins #endif 199003010a33STheodore Ts'o #ifdef CONFIG_EXT4_FS_POSIX_ACL 1991617ba13bSMingming Cao if (def_mount_opts & EXT4_DEFM_ACL) 1992ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, POSIX_ACL); 19932e7842b8SHugh Dickins #endif 1994617ba13bSMingming Cao if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) 1995617ba13bSMingming Cao sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA; 1996617ba13bSMingming Cao else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) 1997617ba13bSMingming Cao sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA; 1998617ba13bSMingming Cao else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) 1999617ba13bSMingming Cao sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA; 2000ac27a0ecSDave Kleikamp 2001617ba13bSMingming Cao if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) 2002ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, ERRORS_PANIC); 2003bb4f397aSAneesh Kumar K.V else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE) 2004ceea16bfSDmitry Mishin set_opt(sbi->s_mount_opt, ERRORS_CONT); 2005bb4f397aSAneesh Kumar K.V else 2006bb4f397aSAneesh Kumar K.V set_opt(sbi->s_mount_opt, ERRORS_RO); 2007ac27a0ecSDave Kleikamp 2008ac27a0ecSDave Kleikamp sbi->s_resuid = le16_to_cpu(es->s_def_resuid); 2009ac27a0ecSDave Kleikamp sbi->s_resgid = le16_to_cpu(es->s_def_resgid); 201030773840STheodore Ts'o sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ; 201130773840STheodore Ts'o sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME; 201230773840STheodore Ts'o sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME; 2013ac27a0ecSDave Kleikamp 2014ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, RESERVATION); 2015571640caSEric Sandeen set_opt(sbi->s_mount_opt, BARRIER); 2016ac27a0ecSDave Kleikamp 20171e2462f9SMingming Cao /* 20181e2462f9SMingming Cao * turn on extents feature by default in ext4 filesystem 2019e4079a11SEric Sandeen * only if feature flag already set by mkfs or tune2fs. 2020e4079a11SEric Sandeen * Use -o noextents to turn it off 20211e2462f9SMingming Cao */ 2022e4079a11SEric Sandeen if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) 20231e2462f9SMingming Cao set_opt(sbi->s_mount_opt, EXTENTS); 2024e4079a11SEric Sandeen else 2025e4079a11SEric Sandeen ext4_warning(sb, __func__, 2026e4079a11SEric Sandeen "extents feature not enabled on this filesystem, " 2027fde4d95aSTheodore Ts'o "use tune2fs."); 20281e2462f9SMingming Cao 2029dd919b98SAneesh Kumar K.V /* 2030dd919b98SAneesh Kumar K.V * enable delayed allocation by default 2031dd919b98SAneesh Kumar K.V * Use -o nodelalloc to turn it off 2032dd919b98SAneesh Kumar K.V */ 2033dd919b98SAneesh Kumar K.V set_opt(sbi->s_mount_opt, DELALLOC); 2034dd919b98SAneesh Kumar K.V 2035dd919b98SAneesh Kumar K.V 2036ac27a0ecSDave Kleikamp if (!parse_options((char *) data, sb, &journal_inum, &journal_devnum, 2037ac27a0ecSDave Kleikamp NULL, 0)) 2038ac27a0ecSDave Kleikamp goto failed_mount; 2039ac27a0ecSDave Kleikamp 2040ac27a0ecSDave Kleikamp sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 2041617ba13bSMingming Cao ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 2042ac27a0ecSDave Kleikamp 2043617ba13bSMingming Cao if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && 2044617ba13bSMingming Cao (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || 2045617ba13bSMingming Cao EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 2046617ba13bSMingming Cao EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) 2047ac27a0ecSDave Kleikamp printk(KERN_WARNING 2048617ba13bSMingming Cao "EXT4-fs warning: feature flags set on rev 0 fs, " 2049ac27a0ecSDave Kleikamp "running e2fsck is recommended\n"); 2050469108ffSTheodore Tso 2051469108ffSTheodore Tso /* 2052ac27a0ecSDave Kleikamp * Check feature flags regardless of the revision level, since we 2053ac27a0ecSDave Kleikamp * previously didn't change the revision level when setting the flags, 2054ac27a0ecSDave Kleikamp * so there is a chance incompat flags are set on a rev 0 filesystem. 2055ac27a0ecSDave Kleikamp */ 2056617ba13bSMingming Cao features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP); 2057ac27a0ecSDave Kleikamp if (features) { 2058617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of " 2059ac27a0ecSDave Kleikamp "unsupported optional features (%x).\n", 2060ac27a0ecSDave Kleikamp sb->s_id, le32_to_cpu(features)); 2061ac27a0ecSDave Kleikamp goto failed_mount; 2062ac27a0ecSDave Kleikamp } 2063617ba13bSMingming Cao features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP); 2064ac27a0ecSDave Kleikamp if (!(sb->s_flags & MS_RDONLY) && features) { 2065617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of " 2066ac27a0ecSDave Kleikamp "unsupported optional features (%x).\n", 2067ac27a0ecSDave Kleikamp sb->s_id, le32_to_cpu(features)); 2068ac27a0ecSDave Kleikamp goto failed_mount; 2069ac27a0ecSDave Kleikamp } 2070f287a1a5STheodore Ts'o has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb, 2071f287a1a5STheodore Ts'o EXT4_FEATURE_RO_COMPAT_HUGE_FILE); 2072f287a1a5STheodore Ts'o if (has_huge_files) { 20730fc1b451SAneesh Kumar K.V /* 20740fc1b451SAneesh Kumar K.V * Large file size enabled file system can only be 2075*b3a6ffe1SJens Axboe * mount if kernel is build with CONFIG_LBD 20760fc1b451SAneesh Kumar K.V */ 20770fc1b451SAneesh Kumar K.V if (sizeof(root->i_blocks) < sizeof(u64) && 20780fc1b451SAneesh Kumar K.V !(sb->s_flags & MS_RDONLY)) { 20790fc1b451SAneesh Kumar K.V printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge " 20800fc1b451SAneesh Kumar K.V "files cannot be mounted read-write " 2081*b3a6ffe1SJens Axboe "without CONFIG_LBD.\n", sb->s_id); 20820fc1b451SAneesh Kumar K.V goto failed_mount; 20830fc1b451SAneesh Kumar K.V } 20840fc1b451SAneesh Kumar K.V } 2085ac27a0ecSDave Kleikamp blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); 2086ac27a0ecSDave Kleikamp 2087617ba13bSMingming Cao if (blocksize < EXT4_MIN_BLOCK_SIZE || 2088617ba13bSMingming Cao blocksize > EXT4_MAX_BLOCK_SIZE) { 2089ac27a0ecSDave Kleikamp printk(KERN_ERR 2090617ba13bSMingming Cao "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n", 2091ac27a0ecSDave Kleikamp blocksize, sb->s_id); 2092ac27a0ecSDave Kleikamp goto failed_mount; 2093ac27a0ecSDave Kleikamp } 2094ac27a0ecSDave Kleikamp 2095ac27a0ecSDave Kleikamp if (sb->s_blocksize != blocksize) { 2096ce40733cSAneesh Kumar K.V 2097ce40733cSAneesh Kumar K.V /* Validate the filesystem blocksize */ 2098ce40733cSAneesh Kumar K.V if (!sb_set_blocksize(sb, blocksize)) { 2099ce40733cSAneesh Kumar K.V printk(KERN_ERR "EXT4-fs: bad block size %d.\n", 2100ce40733cSAneesh Kumar K.V blocksize); 2101ac27a0ecSDave Kleikamp goto failed_mount; 2102ac27a0ecSDave Kleikamp } 2103ac27a0ecSDave Kleikamp 2104ac27a0ecSDave Kleikamp brelse(bh); 210570bbb3e0SAndrew Morton logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 210670bbb3e0SAndrew Morton offset = do_div(logical_sb_block, blocksize); 210770bbb3e0SAndrew Morton bh = sb_bread(sb, logical_sb_block); 2108ac27a0ecSDave Kleikamp if (!bh) { 2109ac27a0ecSDave Kleikamp printk(KERN_ERR 2110617ba13bSMingming Cao "EXT4-fs: Can't read superblock on 2nd try.\n"); 2111ac27a0ecSDave Kleikamp goto failed_mount; 2112ac27a0ecSDave Kleikamp } 2113617ba13bSMingming Cao es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); 2114ac27a0ecSDave Kleikamp sbi->s_es = es; 2115617ba13bSMingming Cao if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { 2116ac27a0ecSDave Kleikamp printk(KERN_ERR 2117617ba13bSMingming Cao "EXT4-fs: Magic mismatch, very weird !\n"); 2118ac27a0ecSDave Kleikamp goto failed_mount; 2119ac27a0ecSDave Kleikamp } 2120ac27a0ecSDave Kleikamp } 2121ac27a0ecSDave Kleikamp 2122f287a1a5STheodore Ts'o sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits, 2123f287a1a5STheodore Ts'o has_huge_files); 2124f287a1a5STheodore Ts'o sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files); 2125ac27a0ecSDave Kleikamp 2126617ba13bSMingming Cao if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { 2127617ba13bSMingming Cao sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; 2128617ba13bSMingming Cao sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; 2129ac27a0ecSDave Kleikamp } else { 2130ac27a0ecSDave Kleikamp sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 2131ac27a0ecSDave Kleikamp sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 2132617ba13bSMingming Cao if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || 21331330593eSVignesh Babu (!is_power_of_2(sbi->s_inode_size)) || 2134ac27a0ecSDave Kleikamp (sbi->s_inode_size > blocksize)) { 2135ac27a0ecSDave Kleikamp printk(KERN_ERR 2136617ba13bSMingming Cao "EXT4-fs: unsupported inode size: %d\n", 2137ac27a0ecSDave Kleikamp sbi->s_inode_size); 2138ac27a0ecSDave Kleikamp goto failed_mount; 2139ac27a0ecSDave Kleikamp } 2140ef7f3835SKalpak Shah if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) 2141ef7f3835SKalpak Shah sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); 2142ac27a0ecSDave Kleikamp } 21430d1ee42fSAlexandre Ratchov sbi->s_desc_size = le16_to_cpu(es->s_desc_size); 21440d1ee42fSAlexandre Ratchov if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { 21458fadc143SAlexandre Ratchov if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || 21460d1ee42fSAlexandre Ratchov sbi->s_desc_size > EXT4_MAX_DESC_SIZE || 2147d8ea6cf8Svignesh babu !is_power_of_2(sbi->s_desc_size)) { 21480d1ee42fSAlexandre Ratchov printk(KERN_ERR 21498fadc143SAlexandre Ratchov "EXT4-fs: unsupported descriptor size %lu\n", 21500d1ee42fSAlexandre Ratchov sbi->s_desc_size); 21510d1ee42fSAlexandre Ratchov goto failed_mount; 21520d1ee42fSAlexandre Ratchov } 21530d1ee42fSAlexandre Ratchov } else 21540d1ee42fSAlexandre Ratchov sbi->s_desc_size = EXT4_MIN_DESC_SIZE; 2155ac27a0ecSDave Kleikamp sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 2156ac27a0ecSDave Kleikamp sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 2157b47b6f38SAndries E. Brouwer if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0) 2158617ba13bSMingming Cao goto cantfind_ext4; 2159617ba13bSMingming Cao sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); 2160ac27a0ecSDave Kleikamp if (sbi->s_inodes_per_block == 0) 2161617ba13bSMingming Cao goto cantfind_ext4; 2162ac27a0ecSDave Kleikamp sbi->s_itb_per_group = sbi->s_inodes_per_group / 2163ac27a0ecSDave Kleikamp sbi->s_inodes_per_block; 21640d1ee42fSAlexandre Ratchov sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); 2165ac27a0ecSDave Kleikamp sbi->s_sbh = bh; 2166ac27a0ecSDave Kleikamp sbi->s_mount_state = le16_to_cpu(es->s_state); 2167e57aa839SFengguang Wu sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); 2168e57aa839SFengguang Wu sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); 2169ac27a0ecSDave Kleikamp for (i = 0; i < 4; i++) 2170ac27a0ecSDave Kleikamp sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); 2171ac27a0ecSDave Kleikamp sbi->s_def_hash_version = es->s_def_hash_version; 2172f99b2589STheodore Ts'o i = le32_to_cpu(es->s_flags); 2173f99b2589STheodore Ts'o if (i & EXT2_FLAGS_UNSIGNED_HASH) 2174f99b2589STheodore Ts'o sbi->s_hash_unsigned = 3; 2175f99b2589STheodore Ts'o else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) { 2176f99b2589STheodore Ts'o #ifdef __CHAR_UNSIGNED__ 2177f99b2589STheodore Ts'o es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH); 2178f99b2589STheodore Ts'o sbi->s_hash_unsigned = 3; 2179f99b2589STheodore Ts'o #else 2180f99b2589STheodore Ts'o es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH); 2181f99b2589STheodore Ts'o #endif 2182f99b2589STheodore Ts'o sb->s_dirt = 1; 2183f99b2589STheodore Ts'o } 2184ac27a0ecSDave Kleikamp 2185ac27a0ecSDave Kleikamp if (sbi->s_blocks_per_group > blocksize * 8) { 2186ac27a0ecSDave Kleikamp printk(KERN_ERR 2187617ba13bSMingming Cao "EXT4-fs: #blocks per group too big: %lu\n", 2188ac27a0ecSDave Kleikamp sbi->s_blocks_per_group); 2189ac27a0ecSDave Kleikamp goto failed_mount; 2190ac27a0ecSDave Kleikamp } 2191ac27a0ecSDave Kleikamp if (sbi->s_inodes_per_group > blocksize * 8) { 2192ac27a0ecSDave Kleikamp printk(KERN_ERR 2193617ba13bSMingming Cao "EXT4-fs: #inodes per group too big: %lu\n", 2194ac27a0ecSDave Kleikamp sbi->s_inodes_per_group); 2195ac27a0ecSDave Kleikamp goto failed_mount; 2196ac27a0ecSDave Kleikamp } 2197ac27a0ecSDave Kleikamp 2198bd81d8eeSLaurent Vivier if (ext4_blocks_count(es) > 2199ac27a0ecSDave Kleikamp (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { 2200617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: filesystem on %s:" 2201ac27a0ecSDave Kleikamp " too large to mount safely\n", sb->s_id); 2202ac27a0ecSDave Kleikamp if (sizeof(sector_t) < 8) 2203617ba13bSMingming Cao printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not " 2204ac27a0ecSDave Kleikamp "enabled\n"); 2205ac27a0ecSDave Kleikamp goto failed_mount; 2206ac27a0ecSDave Kleikamp } 2207ac27a0ecSDave Kleikamp 2208617ba13bSMingming Cao if (EXT4_BLOCKS_PER_GROUP(sb) == 0) 2209617ba13bSMingming Cao goto cantfind_ext4; 2210e7c95593SEric Sandeen 2211e7c95593SEric Sandeen /* ensure blocks_count calculation below doesn't sign-extend */ 2212e7c95593SEric Sandeen if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) < 2213e7c95593SEric Sandeen le32_to_cpu(es->s_first_data_block) + 1) { 2214e7c95593SEric Sandeen printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, " 2215e7c95593SEric Sandeen "first data block %u, blocks per group %lu\n", 2216e7c95593SEric Sandeen ext4_blocks_count(es), 2217e7c95593SEric Sandeen le32_to_cpu(es->s_first_data_block), 2218e7c95593SEric Sandeen EXT4_BLOCKS_PER_GROUP(sb)); 2219e7c95593SEric Sandeen goto failed_mount; 2220e7c95593SEric Sandeen } 2221bd81d8eeSLaurent Vivier blocks_count = (ext4_blocks_count(es) - 2222bd81d8eeSLaurent Vivier le32_to_cpu(es->s_first_data_block) + 2223bd81d8eeSLaurent Vivier EXT4_BLOCKS_PER_GROUP(sb) - 1); 2224bd81d8eeSLaurent Vivier do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); 2225bd81d8eeSLaurent Vivier sbi->s_groups_count = blocks_count; 2226617ba13bSMingming Cao db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / 2227617ba13bSMingming Cao EXT4_DESC_PER_BLOCK(sb); 2228ac27a0ecSDave Kleikamp sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *), 2229ac27a0ecSDave Kleikamp GFP_KERNEL); 2230ac27a0ecSDave Kleikamp if (sbi->s_group_desc == NULL) { 2231617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: not enough memory\n"); 2232ac27a0ecSDave Kleikamp goto failed_mount; 2233ac27a0ecSDave Kleikamp } 2234ac27a0ecSDave Kleikamp 22353244fcb1SAlexander Beregalov #ifdef CONFIG_PROC_FS 22369f6200bbSTheodore Ts'o if (ext4_proc_root) 22379f6200bbSTheodore Ts'o sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); 22389f6200bbSTheodore Ts'o 2239240799cdSTheodore Ts'o if (sbi->s_proc) 2240240799cdSTheodore Ts'o proc_create_data("inode_readahead_blks", 0644, sbi->s_proc, 2241240799cdSTheodore Ts'o &ext4_ui_proc_fops, 2242240799cdSTheodore Ts'o &sbi->s_inode_readahead_blks); 22433244fcb1SAlexander Beregalov #endif 2244240799cdSTheodore Ts'o 2245ac27a0ecSDave Kleikamp bgl_lock_init(&sbi->s_blockgroup_lock); 2246ac27a0ecSDave Kleikamp 2247ac27a0ecSDave Kleikamp for (i = 0; i < db_count; i++) { 224870bbb3e0SAndrew Morton block = descriptor_loc(sb, logical_sb_block, i); 2249ac27a0ecSDave Kleikamp sbi->s_group_desc[i] = sb_bread(sb, block); 2250ac27a0ecSDave Kleikamp if (!sbi->s_group_desc[i]) { 2251617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: " 2252ac27a0ecSDave Kleikamp "can't read group descriptor %d\n", i); 2253ac27a0ecSDave Kleikamp db_count = i; 2254ac27a0ecSDave Kleikamp goto failed_mount2; 2255ac27a0ecSDave Kleikamp } 2256ac27a0ecSDave Kleikamp } 2257617ba13bSMingming Cao if (!ext4_check_descriptors(sb)) { 2258617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n"); 2259ac27a0ecSDave Kleikamp goto failed_mount2; 2260ac27a0ecSDave Kleikamp } 2261772cb7c8SJose R. Santos if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 2262772cb7c8SJose R. Santos if (!ext4_fill_flex_info(sb)) { 2263772cb7c8SJose R. Santos printk(KERN_ERR 2264772cb7c8SJose R. Santos "EXT4-fs: unable to initialize " 2265772cb7c8SJose R. Santos "flex_bg meta info!\n"); 2266772cb7c8SJose R. Santos goto failed_mount2; 2267772cb7c8SJose R. Santos } 2268772cb7c8SJose R. Santos 2269ac27a0ecSDave Kleikamp sbi->s_gdb_count = db_count; 2270ac27a0ecSDave Kleikamp get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 2271ac27a0ecSDave Kleikamp spin_lock_init(&sbi->s_next_gen_lock); 2272ac27a0ecSDave Kleikamp 2273833f4077SPeter Zijlstra err = percpu_counter_init(&sbi->s_freeblocks_counter, 2274617ba13bSMingming Cao ext4_count_free_blocks(sb)); 2275833f4077SPeter Zijlstra if (!err) { 2276833f4077SPeter Zijlstra err = percpu_counter_init(&sbi->s_freeinodes_counter, 2277617ba13bSMingming Cao ext4_count_free_inodes(sb)); 2278833f4077SPeter Zijlstra } 2279833f4077SPeter Zijlstra if (!err) { 2280833f4077SPeter Zijlstra err = percpu_counter_init(&sbi->s_dirs_counter, 2281617ba13bSMingming Cao ext4_count_dirs(sb)); 2282833f4077SPeter Zijlstra } 22836bc6e63fSAneesh Kumar K.V if (!err) { 22846bc6e63fSAneesh Kumar K.V err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0); 22856bc6e63fSAneesh Kumar K.V } 2286833f4077SPeter Zijlstra if (err) { 2287833f4077SPeter Zijlstra printk(KERN_ERR "EXT4-fs: insufficient memory\n"); 2288833f4077SPeter Zijlstra goto failed_mount3; 2289833f4077SPeter Zijlstra } 2290ac27a0ecSDave Kleikamp 2291c9de560dSAlex Tomas sbi->s_stripe = ext4_get_stripe_size(sbi); 2292c9de560dSAlex Tomas 2293ac27a0ecSDave Kleikamp /* 2294ac27a0ecSDave Kleikamp * set up enough so that it can read an inode 2295ac27a0ecSDave Kleikamp */ 2296617ba13bSMingming Cao sb->s_op = &ext4_sops; 2297617ba13bSMingming Cao sb->s_export_op = &ext4_export_ops; 2298617ba13bSMingming Cao sb->s_xattr = ext4_xattr_handlers; 2299ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 2300617ba13bSMingming Cao sb->s_qcop = &ext4_qctl_operations; 2301617ba13bSMingming Cao sb->dq_op = &ext4_quota_operations; 2302ac27a0ecSDave Kleikamp #endif 2303ac27a0ecSDave Kleikamp INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ 2304ac27a0ecSDave Kleikamp 2305ac27a0ecSDave Kleikamp sb->s_root = NULL; 2306ac27a0ecSDave Kleikamp 2307ac27a0ecSDave Kleikamp needs_recovery = (es->s_last_orphan != 0 || 2308617ba13bSMingming Cao EXT4_HAS_INCOMPAT_FEATURE(sb, 2309617ba13bSMingming Cao EXT4_FEATURE_INCOMPAT_RECOVER)); 2310ac27a0ecSDave Kleikamp 2311ac27a0ecSDave Kleikamp /* 2312ac27a0ecSDave Kleikamp * The first inode we look at is the journal inode. Don't try 2313ac27a0ecSDave Kleikamp * root first: it may be modified in the journal! 2314ac27a0ecSDave Kleikamp */ 2315ac27a0ecSDave Kleikamp if (!test_opt(sb, NOLOAD) && 2316617ba13bSMingming Cao EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 2317617ba13bSMingming Cao if (ext4_load_journal(sb, es, journal_devnum)) 2318ac27a0ecSDave Kleikamp goto failed_mount3; 2319624080edSTheodore Ts'o if (!(sb->s_flags & MS_RDONLY) && 2320624080edSTheodore Ts'o EXT4_SB(sb)->s_journal->j_failed_commit) { 2321624080edSTheodore Ts'o printk(KERN_CRIT "EXT4-fs error (device %s): " 2322624080edSTheodore Ts'o "ext4_fill_super: Journal transaction " 2323624080edSTheodore Ts'o "%u is corrupt\n", sb->s_id, 2324624080edSTheodore Ts'o EXT4_SB(sb)->s_journal->j_failed_commit); 2325624080edSTheodore Ts'o if (test_opt(sb, ERRORS_RO)) { 2326624080edSTheodore Ts'o printk(KERN_CRIT 2327624080edSTheodore Ts'o "Mounting filesystem read-only\n"); 2328624080edSTheodore Ts'o sb->s_flags |= MS_RDONLY; 2329624080edSTheodore Ts'o EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 2330624080edSTheodore Ts'o es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 2331624080edSTheodore Ts'o } 2332624080edSTheodore Ts'o if (test_opt(sb, ERRORS_PANIC)) { 2333624080edSTheodore Ts'o EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 2334624080edSTheodore Ts'o es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 2335624080edSTheodore Ts'o ext4_commit_super(sb, es, 1); 2336624080edSTheodore Ts'o goto failed_mount4; 2337624080edSTheodore Ts'o } 2338624080edSTheodore Ts'o } 2339ac27a0ecSDave Kleikamp } else if (journal_inum) { 2340617ba13bSMingming Cao if (ext4_create_journal(sb, es, journal_inum)) 2341ac27a0ecSDave Kleikamp goto failed_mount3; 23420390131bSFrank Mayhar } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) && 23430390131bSFrank Mayhar EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 23440390131bSFrank Mayhar printk(KERN_ERR "EXT4-fs: required journal recovery " 23450390131bSFrank Mayhar "suppressed and not mounted read-only\n"); 23460390131bSFrank Mayhar goto failed_mount4; 2347ac27a0ecSDave Kleikamp } else { 23480390131bSFrank Mayhar clear_opt(sbi->s_mount_opt, DATA_FLAGS); 23490390131bSFrank Mayhar set_opt(sbi->s_mount_opt, WRITEBACK_DATA); 23500390131bSFrank Mayhar sbi->s_journal = NULL; 23510390131bSFrank Mayhar needs_recovery = 0; 23520390131bSFrank Mayhar goto no_journal; 2353ac27a0ecSDave Kleikamp } 2354ac27a0ecSDave Kleikamp 2355eb40a09cSJose R. Santos if (ext4_blocks_count(es) > 0xffffffffULL && 2356eb40a09cSJose R. Santos !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, 2357eb40a09cSJose R. Santos JBD2_FEATURE_INCOMPAT_64BIT)) { 2358eb40a09cSJose R. Santos printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n"); 2359eb40a09cSJose R. Santos goto failed_mount4; 2360eb40a09cSJose R. Santos } 2361eb40a09cSJose R. Santos 2362818d276cSGirish Shilamkar if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 2363818d276cSGirish Shilamkar jbd2_journal_set_features(sbi->s_journal, 2364818d276cSGirish Shilamkar JBD2_FEATURE_COMPAT_CHECKSUM, 0, 2365818d276cSGirish Shilamkar JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2366818d276cSGirish Shilamkar } else if (test_opt(sb, JOURNAL_CHECKSUM)) { 2367818d276cSGirish Shilamkar jbd2_journal_set_features(sbi->s_journal, 2368818d276cSGirish Shilamkar JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0); 2369818d276cSGirish Shilamkar jbd2_journal_clear_features(sbi->s_journal, 0, 0, 2370818d276cSGirish Shilamkar JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2371818d276cSGirish Shilamkar } else { 2372818d276cSGirish Shilamkar jbd2_journal_clear_features(sbi->s_journal, 2373818d276cSGirish Shilamkar JBD2_FEATURE_COMPAT_CHECKSUM, 0, 2374818d276cSGirish Shilamkar JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2375818d276cSGirish Shilamkar } 2376818d276cSGirish Shilamkar 2377ac27a0ecSDave Kleikamp /* We have now updated the journal if required, so we can 2378ac27a0ecSDave Kleikamp * validate the data journaling mode. */ 2379ac27a0ecSDave Kleikamp switch (test_opt(sb, DATA_FLAGS)) { 2380ac27a0ecSDave Kleikamp case 0: 2381ac27a0ecSDave Kleikamp /* No mode set, assume a default based on the journal 238263f57933SAndrew Morton * capabilities: ORDERED_DATA if the journal can 238363f57933SAndrew Morton * cope, else JOURNAL_DATA 238463f57933SAndrew Morton */ 2385dab291afSMingming Cao if (jbd2_journal_check_available_features 2386dab291afSMingming Cao (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) 2387ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, ORDERED_DATA); 2388ac27a0ecSDave Kleikamp else 2389ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, JOURNAL_DATA); 2390ac27a0ecSDave Kleikamp break; 2391ac27a0ecSDave Kleikamp 2392617ba13bSMingming Cao case EXT4_MOUNT_ORDERED_DATA: 2393617ba13bSMingming Cao case EXT4_MOUNT_WRITEBACK_DATA: 2394dab291afSMingming Cao if (!jbd2_journal_check_available_features 2395dab291afSMingming Cao (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { 2396617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: Journal does not support " 2397ac27a0ecSDave Kleikamp "requested data journaling mode\n"); 2398ac27a0ecSDave Kleikamp goto failed_mount4; 2399ac27a0ecSDave Kleikamp } 2400ac27a0ecSDave Kleikamp default: 2401ac27a0ecSDave Kleikamp break; 2402ac27a0ecSDave Kleikamp } 2403ac27a0ecSDave Kleikamp 24040390131bSFrank Mayhar no_journal: 24050390131bSFrank Mayhar 2406ac27a0ecSDave Kleikamp if (test_opt(sb, NOBH)) { 2407617ba13bSMingming Cao if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) { 2408617ba13bSMingming Cao printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - " 2409ac27a0ecSDave Kleikamp "its supported only with writeback mode\n"); 2410ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, NOBH); 2411ac27a0ecSDave Kleikamp } 2412ac27a0ecSDave Kleikamp } 2413ac27a0ecSDave Kleikamp /* 2414dab291afSMingming Cao * The jbd2_journal_load will have done any necessary log recovery, 2415ac27a0ecSDave Kleikamp * so we can safely mount the rest of the filesystem now. 2416ac27a0ecSDave Kleikamp */ 2417ac27a0ecSDave Kleikamp 24181d1fe1eeSDavid Howells root = ext4_iget(sb, EXT4_ROOT_INO); 24191d1fe1eeSDavid Howells if (IS_ERR(root)) { 2420617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: get root inode failed\n"); 24211d1fe1eeSDavid Howells ret = PTR_ERR(root); 2422ac27a0ecSDave Kleikamp goto failed_mount4; 2423ac27a0ecSDave Kleikamp } 2424ac27a0ecSDave Kleikamp if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 24251d1fe1eeSDavid Howells iput(root); 2426617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n"); 2427ac27a0ecSDave Kleikamp goto failed_mount4; 2428ac27a0ecSDave Kleikamp } 24291d1fe1eeSDavid Howells sb->s_root = d_alloc_root(root); 24301d1fe1eeSDavid Howells if (!sb->s_root) { 24311d1fe1eeSDavid Howells printk(KERN_ERR "EXT4-fs: get root dentry failed\n"); 24321d1fe1eeSDavid Howells iput(root); 24331d1fe1eeSDavid Howells ret = -ENOMEM; 24341d1fe1eeSDavid Howells goto failed_mount4; 24351d1fe1eeSDavid Howells } 2436ac27a0ecSDave Kleikamp 2437617ba13bSMingming Cao ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY); 2438ef7f3835SKalpak Shah 2439ef7f3835SKalpak Shah /* determine the minimum size of new large inodes, if present */ 2440ef7f3835SKalpak Shah if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { 2441ef7f3835SKalpak Shah sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 2442ef7f3835SKalpak Shah EXT4_GOOD_OLD_INODE_SIZE; 2443ef7f3835SKalpak Shah if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 2444ef7f3835SKalpak Shah EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { 2445ef7f3835SKalpak Shah if (sbi->s_want_extra_isize < 2446ef7f3835SKalpak Shah le16_to_cpu(es->s_want_extra_isize)) 2447ef7f3835SKalpak Shah sbi->s_want_extra_isize = 2448ef7f3835SKalpak Shah le16_to_cpu(es->s_want_extra_isize); 2449ef7f3835SKalpak Shah if (sbi->s_want_extra_isize < 2450ef7f3835SKalpak Shah le16_to_cpu(es->s_min_extra_isize)) 2451ef7f3835SKalpak Shah sbi->s_want_extra_isize = 2452ef7f3835SKalpak Shah le16_to_cpu(es->s_min_extra_isize); 2453ef7f3835SKalpak Shah } 2454ef7f3835SKalpak Shah } 2455ef7f3835SKalpak Shah /* Check if enough inode space is available */ 2456ef7f3835SKalpak Shah if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > 2457ef7f3835SKalpak Shah sbi->s_inode_size) { 2458ef7f3835SKalpak Shah sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 2459ef7f3835SKalpak Shah EXT4_GOOD_OLD_INODE_SIZE; 2460ef7f3835SKalpak Shah printk(KERN_INFO "EXT4-fs: required extra inode space not" 2461ef7f3835SKalpak Shah "available.\n"); 2462ef7f3835SKalpak Shah } 2463ef7f3835SKalpak Shah 2464c2774d84SAneesh Kumar K.V if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { 2465c2774d84SAneesh Kumar K.V printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - " 2466c2774d84SAneesh Kumar K.V "requested data journaling mode\n"); 2467c2774d84SAneesh Kumar K.V clear_opt(sbi->s_mount_opt, DELALLOC); 2468c2774d84SAneesh Kumar K.V } else if (test_opt(sb, DELALLOC)) 2469c2774d84SAneesh Kumar K.V printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n"); 2470c2774d84SAneesh Kumar K.V 2471c2774d84SAneesh Kumar K.V ext4_ext_init(sb); 2472c2774d84SAneesh Kumar K.V err = ext4_mb_init(sb, needs_recovery); 2473c2774d84SAneesh Kumar K.V if (err) { 2474c2774d84SAneesh Kumar K.V printk(KERN_ERR "EXT4-fs: failed to initalize mballoc (%d)\n", 2475c2774d84SAneesh Kumar K.V err); 2476c2774d84SAneesh Kumar K.V goto failed_mount4; 2477c2774d84SAneesh Kumar K.V } 2478c2774d84SAneesh Kumar K.V 2479ac27a0ecSDave Kleikamp /* 2480ac27a0ecSDave Kleikamp * akpm: core read_super() calls in here with the superblock locked. 2481ac27a0ecSDave Kleikamp * That deadlocks, because orphan cleanup needs to lock the superblock 2482ac27a0ecSDave Kleikamp * in numerous places. Here we just pop the lock - it's relatively 2483ac27a0ecSDave Kleikamp * harmless, because we are now ready to accept write_super() requests, 2484ac27a0ecSDave Kleikamp * and aviro says that's the only reason for hanging onto the 2485ac27a0ecSDave Kleikamp * superblock lock. 2486ac27a0ecSDave Kleikamp */ 2487617ba13bSMingming Cao EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; 2488617ba13bSMingming Cao ext4_orphan_cleanup(sb, es); 2489617ba13bSMingming Cao EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; 24900390131bSFrank Mayhar if (needs_recovery) { 2491617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: recovery complete.\n"); 2492617ba13bSMingming Cao ext4_mark_recovery_complete(sb, es); 24930390131bSFrank Mayhar } 24940390131bSFrank Mayhar if (EXT4_SB(sb)->s_journal) { 24950390131bSFrank Mayhar if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 24960390131bSFrank Mayhar descr = " journalled data mode"; 24970390131bSFrank Mayhar else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 24980390131bSFrank Mayhar descr = " ordered data mode"; 24990390131bSFrank Mayhar else 25000390131bSFrank Mayhar descr = " writeback data mode"; 25010390131bSFrank Mayhar } else 25020390131bSFrank Mayhar descr = "out journal"; 25030390131bSFrank Mayhar 25040390131bSFrank Mayhar printk(KERN_INFO "EXT4-fs: mounted filesystem %s with%s\n", 25050390131bSFrank Mayhar sb->s_id, descr); 2506ac27a0ecSDave Kleikamp 2507ac27a0ecSDave Kleikamp lock_kernel(); 2508ac27a0ecSDave Kleikamp return 0; 2509ac27a0ecSDave Kleikamp 2510617ba13bSMingming Cao cantfind_ext4: 2511ac27a0ecSDave Kleikamp if (!silent) 2512617ba13bSMingming Cao printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n", 2513ac27a0ecSDave Kleikamp sb->s_id); 2514ac27a0ecSDave Kleikamp goto failed_mount; 2515ac27a0ecSDave Kleikamp 2516ac27a0ecSDave Kleikamp failed_mount4: 25170390131bSFrank Mayhar printk(KERN_ERR "EXT4-fs (device %s): mount failed\n", sb->s_id); 25180390131bSFrank Mayhar if (sbi->s_journal) { 2519dab291afSMingming Cao jbd2_journal_destroy(sbi->s_journal); 252047b4a50bSJan Kara sbi->s_journal = NULL; 25210390131bSFrank Mayhar } 2522ac27a0ecSDave Kleikamp failed_mount3: 2523ac27a0ecSDave Kleikamp percpu_counter_destroy(&sbi->s_freeblocks_counter); 2524ac27a0ecSDave Kleikamp percpu_counter_destroy(&sbi->s_freeinodes_counter); 2525ac27a0ecSDave Kleikamp percpu_counter_destroy(&sbi->s_dirs_counter); 25266bc6e63fSAneesh Kumar K.V percpu_counter_destroy(&sbi->s_dirtyblocks_counter); 2527ac27a0ecSDave Kleikamp failed_mount2: 2528ac27a0ecSDave Kleikamp for (i = 0; i < db_count; i++) 2529ac27a0ecSDave Kleikamp brelse(sbi->s_group_desc[i]); 2530ac27a0ecSDave Kleikamp kfree(sbi->s_group_desc); 2531ac27a0ecSDave Kleikamp failed_mount: 2532240799cdSTheodore Ts'o if (sbi->s_proc) { 2533240799cdSTheodore Ts'o remove_proc_entry("inode_readahead_blks", sbi->s_proc); 25349f6200bbSTheodore Ts'o remove_proc_entry(sb->s_id, ext4_proc_root); 2535240799cdSTheodore Ts'o } 2536ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 2537ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) 2538ac27a0ecSDave Kleikamp kfree(sbi->s_qf_names[i]); 2539ac27a0ecSDave Kleikamp #endif 2540617ba13bSMingming Cao ext4_blkdev_remove(sbi); 2541ac27a0ecSDave Kleikamp brelse(bh); 2542ac27a0ecSDave Kleikamp out_fail: 2543ac27a0ecSDave Kleikamp sb->s_fs_info = NULL; 2544ac27a0ecSDave Kleikamp kfree(sbi); 2545ac27a0ecSDave Kleikamp lock_kernel(); 25461d1fe1eeSDavid Howells return ret; 2547ac27a0ecSDave Kleikamp } 2548ac27a0ecSDave Kleikamp 2549ac27a0ecSDave Kleikamp /* 2550ac27a0ecSDave Kleikamp * Setup any per-fs journal parameters now. We'll do this both on 2551ac27a0ecSDave Kleikamp * initial mount, once the journal has been initialised but before we've 2552ac27a0ecSDave Kleikamp * done any recovery; and again on any subsequent remount. 2553ac27a0ecSDave Kleikamp */ 2554617ba13bSMingming Cao static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) 2555ac27a0ecSDave Kleikamp { 2556617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 2557ac27a0ecSDave Kleikamp 2558ac27a0ecSDave Kleikamp journal->j_commit_interval = sbi->s_commit_interval; 255930773840STheodore Ts'o journal->j_min_batch_time = sbi->s_min_batch_time; 256030773840STheodore Ts'o journal->j_max_batch_time = sbi->s_max_batch_time; 2561ac27a0ecSDave Kleikamp 2562ac27a0ecSDave Kleikamp spin_lock(&journal->j_state_lock); 2563ac27a0ecSDave Kleikamp if (test_opt(sb, BARRIER)) 2564dab291afSMingming Cao journal->j_flags |= JBD2_BARRIER; 2565ac27a0ecSDave Kleikamp else 2566dab291afSMingming Cao journal->j_flags &= ~JBD2_BARRIER; 25675bf5683aSHidehiro Kawai if (test_opt(sb, DATA_ERR_ABORT)) 25685bf5683aSHidehiro Kawai journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR; 25695bf5683aSHidehiro Kawai else 25705bf5683aSHidehiro Kawai journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR; 2571ac27a0ecSDave Kleikamp spin_unlock(&journal->j_state_lock); 2572ac27a0ecSDave Kleikamp } 2573ac27a0ecSDave Kleikamp 2574617ba13bSMingming Cao static journal_t *ext4_get_journal(struct super_block *sb, 2575ac27a0ecSDave Kleikamp unsigned int journal_inum) 2576ac27a0ecSDave Kleikamp { 2577ac27a0ecSDave Kleikamp struct inode *journal_inode; 2578ac27a0ecSDave Kleikamp journal_t *journal; 2579ac27a0ecSDave Kleikamp 25800390131bSFrank Mayhar BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 25810390131bSFrank Mayhar 2582ac27a0ecSDave Kleikamp /* First, test for the existence of a valid inode on disk. Bad 2583ac27a0ecSDave Kleikamp * things happen if we iget() an unused inode, as the subsequent 2584ac27a0ecSDave Kleikamp * iput() will try to delete it. */ 2585ac27a0ecSDave Kleikamp 25861d1fe1eeSDavid Howells journal_inode = ext4_iget(sb, journal_inum); 25871d1fe1eeSDavid Howells if (IS_ERR(journal_inode)) { 2588617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: no journal found.\n"); 2589ac27a0ecSDave Kleikamp return NULL; 2590ac27a0ecSDave Kleikamp } 2591ac27a0ecSDave Kleikamp if (!journal_inode->i_nlink) { 2592ac27a0ecSDave Kleikamp make_bad_inode(journal_inode); 2593ac27a0ecSDave Kleikamp iput(journal_inode); 2594617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n"); 2595ac27a0ecSDave Kleikamp return NULL; 2596ac27a0ecSDave Kleikamp } 2597ac27a0ecSDave Kleikamp 2598e5f8eab8STheodore Ts'o jbd_debug(2, "Journal inode found at %p: %lld bytes\n", 2599ac27a0ecSDave Kleikamp journal_inode, journal_inode->i_size); 26001d1fe1eeSDavid Howells if (!S_ISREG(journal_inode->i_mode)) { 2601617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: invalid journal inode.\n"); 2602ac27a0ecSDave Kleikamp iput(journal_inode); 2603ac27a0ecSDave Kleikamp return NULL; 2604ac27a0ecSDave Kleikamp } 2605ac27a0ecSDave Kleikamp 2606dab291afSMingming Cao journal = jbd2_journal_init_inode(journal_inode); 2607ac27a0ecSDave Kleikamp if (!journal) { 2608617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: Could not load journal inode\n"); 2609ac27a0ecSDave Kleikamp iput(journal_inode); 2610ac27a0ecSDave Kleikamp return NULL; 2611ac27a0ecSDave Kleikamp } 2612ac27a0ecSDave Kleikamp journal->j_private = sb; 2613617ba13bSMingming Cao ext4_init_journal_params(sb, journal); 2614ac27a0ecSDave Kleikamp return journal; 2615ac27a0ecSDave Kleikamp } 2616ac27a0ecSDave Kleikamp 2617617ba13bSMingming Cao static journal_t *ext4_get_dev_journal(struct super_block *sb, 2618ac27a0ecSDave Kleikamp dev_t j_dev) 2619ac27a0ecSDave Kleikamp { 2620ac27a0ecSDave Kleikamp struct buffer_head *bh; 2621ac27a0ecSDave Kleikamp journal_t *journal; 2622617ba13bSMingming Cao ext4_fsblk_t start; 2623617ba13bSMingming Cao ext4_fsblk_t len; 2624ac27a0ecSDave Kleikamp int hblock, blocksize; 2625617ba13bSMingming Cao ext4_fsblk_t sb_block; 2626ac27a0ecSDave Kleikamp unsigned long offset; 2627617ba13bSMingming Cao struct ext4_super_block *es; 2628ac27a0ecSDave Kleikamp struct block_device *bdev; 2629ac27a0ecSDave Kleikamp 26300390131bSFrank Mayhar BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 26310390131bSFrank Mayhar 2632617ba13bSMingming Cao bdev = ext4_blkdev_get(j_dev); 2633ac27a0ecSDave Kleikamp if (bdev == NULL) 2634ac27a0ecSDave Kleikamp return NULL; 2635ac27a0ecSDave Kleikamp 2636ac27a0ecSDave Kleikamp if (bd_claim(bdev, sb)) { 2637ac27a0ecSDave Kleikamp printk(KERN_ERR 2638617ba13bSMingming Cao "EXT4: failed to claim external journal device.\n"); 26399a1c3542SAl Viro blkdev_put(bdev, FMODE_READ|FMODE_WRITE); 2640ac27a0ecSDave Kleikamp return NULL; 2641ac27a0ecSDave Kleikamp } 2642ac27a0ecSDave Kleikamp 2643ac27a0ecSDave Kleikamp blocksize = sb->s_blocksize; 2644ac27a0ecSDave Kleikamp hblock = bdev_hardsect_size(bdev); 2645ac27a0ecSDave Kleikamp if (blocksize < hblock) { 2646ac27a0ecSDave Kleikamp printk(KERN_ERR 2647617ba13bSMingming Cao "EXT4-fs: blocksize too small for journal device.\n"); 2648ac27a0ecSDave Kleikamp goto out_bdev; 2649ac27a0ecSDave Kleikamp } 2650ac27a0ecSDave Kleikamp 2651617ba13bSMingming Cao sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; 2652617ba13bSMingming Cao offset = EXT4_MIN_BLOCK_SIZE % blocksize; 2653ac27a0ecSDave Kleikamp set_blocksize(bdev, blocksize); 2654ac27a0ecSDave Kleikamp if (!(bh = __bread(bdev, sb_block, blocksize))) { 2655617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: couldn't read superblock of " 2656ac27a0ecSDave Kleikamp "external journal\n"); 2657ac27a0ecSDave Kleikamp goto out_bdev; 2658ac27a0ecSDave Kleikamp } 2659ac27a0ecSDave Kleikamp 2660617ba13bSMingming Cao es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 2661617ba13bSMingming Cao if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || 2662ac27a0ecSDave Kleikamp !(le32_to_cpu(es->s_feature_incompat) & 2663617ba13bSMingming Cao EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { 2664617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: external journal has " 2665ac27a0ecSDave Kleikamp "bad superblock\n"); 2666ac27a0ecSDave Kleikamp brelse(bh); 2667ac27a0ecSDave Kleikamp goto out_bdev; 2668ac27a0ecSDave Kleikamp } 2669ac27a0ecSDave Kleikamp 2670617ba13bSMingming Cao if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { 2671617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: journal UUID does not match\n"); 2672ac27a0ecSDave Kleikamp brelse(bh); 2673ac27a0ecSDave Kleikamp goto out_bdev; 2674ac27a0ecSDave Kleikamp } 2675ac27a0ecSDave Kleikamp 2676bd81d8eeSLaurent Vivier len = ext4_blocks_count(es); 2677ac27a0ecSDave Kleikamp start = sb_block + 1; 2678ac27a0ecSDave Kleikamp brelse(bh); /* we're done with the superblock */ 2679ac27a0ecSDave Kleikamp 2680dab291afSMingming Cao journal = jbd2_journal_init_dev(bdev, sb->s_bdev, 2681ac27a0ecSDave Kleikamp start, len, blocksize); 2682ac27a0ecSDave Kleikamp if (!journal) { 2683617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: failed to create device journal\n"); 2684ac27a0ecSDave Kleikamp goto out_bdev; 2685ac27a0ecSDave Kleikamp } 2686ac27a0ecSDave Kleikamp journal->j_private = sb; 2687ac27a0ecSDave Kleikamp ll_rw_block(READ, 1, &journal->j_sb_buffer); 2688ac27a0ecSDave Kleikamp wait_on_buffer(journal->j_sb_buffer); 2689ac27a0ecSDave Kleikamp if (!buffer_uptodate(journal->j_sb_buffer)) { 2690617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: I/O error on journal device\n"); 2691ac27a0ecSDave Kleikamp goto out_journal; 2692ac27a0ecSDave Kleikamp } 2693ac27a0ecSDave Kleikamp if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { 2694617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: External journal has more than one " 2695ac27a0ecSDave Kleikamp "user (unsupported) - %d\n", 2696ac27a0ecSDave Kleikamp be32_to_cpu(journal->j_superblock->s_nr_users)); 2697ac27a0ecSDave Kleikamp goto out_journal; 2698ac27a0ecSDave Kleikamp } 2699617ba13bSMingming Cao EXT4_SB(sb)->journal_bdev = bdev; 2700617ba13bSMingming Cao ext4_init_journal_params(sb, journal); 2701ac27a0ecSDave Kleikamp return journal; 2702ac27a0ecSDave Kleikamp out_journal: 2703dab291afSMingming Cao jbd2_journal_destroy(journal); 2704ac27a0ecSDave Kleikamp out_bdev: 2705617ba13bSMingming Cao ext4_blkdev_put(bdev); 2706ac27a0ecSDave Kleikamp return NULL; 2707ac27a0ecSDave Kleikamp } 2708ac27a0ecSDave Kleikamp 2709617ba13bSMingming Cao static int ext4_load_journal(struct super_block *sb, 2710617ba13bSMingming Cao struct ext4_super_block *es, 2711ac27a0ecSDave Kleikamp unsigned long journal_devnum) 2712ac27a0ecSDave Kleikamp { 2713ac27a0ecSDave Kleikamp journal_t *journal; 2714ac27a0ecSDave Kleikamp unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); 2715ac27a0ecSDave Kleikamp dev_t journal_dev; 2716ac27a0ecSDave Kleikamp int err = 0; 2717ac27a0ecSDave Kleikamp int really_read_only; 2718ac27a0ecSDave Kleikamp 27190390131bSFrank Mayhar BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 27200390131bSFrank Mayhar 2721ac27a0ecSDave Kleikamp if (journal_devnum && 2722ac27a0ecSDave Kleikamp journal_devnum != le32_to_cpu(es->s_journal_dev)) { 2723617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: external journal device major/minor " 2724ac27a0ecSDave Kleikamp "numbers have changed\n"); 2725ac27a0ecSDave Kleikamp journal_dev = new_decode_dev(journal_devnum); 2726ac27a0ecSDave Kleikamp } else 2727ac27a0ecSDave Kleikamp journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); 2728ac27a0ecSDave Kleikamp 2729ac27a0ecSDave Kleikamp really_read_only = bdev_read_only(sb->s_bdev); 2730ac27a0ecSDave Kleikamp 2731ac27a0ecSDave Kleikamp /* 2732ac27a0ecSDave Kleikamp * Are we loading a blank journal or performing recovery after a 2733ac27a0ecSDave Kleikamp * crash? For recovery, we need to check in advance whether we 2734ac27a0ecSDave Kleikamp * can get read-write access to the device. 2735ac27a0ecSDave Kleikamp */ 2736ac27a0ecSDave Kleikamp 2737617ba13bSMingming Cao if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 2738ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) { 2739617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: INFO: recovery " 2740ac27a0ecSDave Kleikamp "required on readonly filesystem.\n"); 2741ac27a0ecSDave Kleikamp if (really_read_only) { 2742617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: write access " 2743ac27a0ecSDave Kleikamp "unavailable, cannot proceed.\n"); 2744ac27a0ecSDave Kleikamp return -EROFS; 2745ac27a0ecSDave Kleikamp } 2746617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: write access will " 2747ac27a0ecSDave Kleikamp "be enabled during recovery.\n"); 2748ac27a0ecSDave Kleikamp } 2749ac27a0ecSDave Kleikamp } 2750ac27a0ecSDave Kleikamp 2751ac27a0ecSDave Kleikamp if (journal_inum && journal_dev) { 2752617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: filesystem has both journal " 2753ac27a0ecSDave Kleikamp "and inode journals!\n"); 2754ac27a0ecSDave Kleikamp return -EINVAL; 2755ac27a0ecSDave Kleikamp } 2756ac27a0ecSDave Kleikamp 2757ac27a0ecSDave Kleikamp if (journal_inum) { 2758617ba13bSMingming Cao if (!(journal = ext4_get_journal(sb, journal_inum))) 2759ac27a0ecSDave Kleikamp return -EINVAL; 2760ac27a0ecSDave Kleikamp } else { 2761617ba13bSMingming Cao if (!(journal = ext4_get_dev_journal(sb, journal_dev))) 2762ac27a0ecSDave Kleikamp return -EINVAL; 2763ac27a0ecSDave Kleikamp } 2764ac27a0ecSDave Kleikamp 27654776004fSTheodore Ts'o if (journal->j_flags & JBD2_BARRIER) 27664776004fSTheodore Ts'o printk(KERN_INFO "EXT4-fs: barriers enabled\n"); 27674776004fSTheodore Ts'o else 27684776004fSTheodore Ts'o printk(KERN_INFO "EXT4-fs: barriers disabled\n"); 27694776004fSTheodore Ts'o 2770ac27a0ecSDave Kleikamp if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { 2771dab291afSMingming Cao err = jbd2_journal_update_format(journal); 2772ac27a0ecSDave Kleikamp if (err) { 2773617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: error updating journal.\n"); 2774dab291afSMingming Cao jbd2_journal_destroy(journal); 2775ac27a0ecSDave Kleikamp return err; 2776ac27a0ecSDave Kleikamp } 2777ac27a0ecSDave Kleikamp } 2778ac27a0ecSDave Kleikamp 2779617ba13bSMingming Cao if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) 2780dab291afSMingming Cao err = jbd2_journal_wipe(journal, !really_read_only); 2781ac27a0ecSDave Kleikamp if (!err) 2782dab291afSMingming Cao err = jbd2_journal_load(journal); 2783ac27a0ecSDave Kleikamp 2784ac27a0ecSDave Kleikamp if (err) { 2785617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: error loading journal.\n"); 2786dab291afSMingming Cao jbd2_journal_destroy(journal); 2787ac27a0ecSDave Kleikamp return err; 2788ac27a0ecSDave Kleikamp } 2789ac27a0ecSDave Kleikamp 2790617ba13bSMingming Cao EXT4_SB(sb)->s_journal = journal; 2791617ba13bSMingming Cao ext4_clear_journal_err(sb, es); 2792ac27a0ecSDave Kleikamp 2793ac27a0ecSDave Kleikamp if (journal_devnum && 2794ac27a0ecSDave Kleikamp journal_devnum != le32_to_cpu(es->s_journal_dev)) { 2795ac27a0ecSDave Kleikamp es->s_journal_dev = cpu_to_le32(journal_devnum); 2796ac27a0ecSDave Kleikamp sb->s_dirt = 1; 2797ac27a0ecSDave Kleikamp 2798ac27a0ecSDave Kleikamp /* Make sure we flush the recovery flag to disk. */ 2799617ba13bSMingming Cao ext4_commit_super(sb, es, 1); 2800ac27a0ecSDave Kleikamp } 2801ac27a0ecSDave Kleikamp 2802ac27a0ecSDave Kleikamp return 0; 2803ac27a0ecSDave Kleikamp } 2804ac27a0ecSDave Kleikamp 2805617ba13bSMingming Cao static int ext4_create_journal(struct super_block *sb, 2806617ba13bSMingming Cao struct ext4_super_block *es, 2807ac27a0ecSDave Kleikamp unsigned int journal_inum) 2808ac27a0ecSDave Kleikamp { 2809ac27a0ecSDave Kleikamp journal_t *journal; 28106c675bd4SBorislav Petkov int err; 2811ac27a0ecSDave Kleikamp 2812ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) { 2813617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to " 2814ac27a0ecSDave Kleikamp "create journal.\n"); 2815ac27a0ecSDave Kleikamp return -EROFS; 2816ac27a0ecSDave Kleikamp } 2817ac27a0ecSDave Kleikamp 28186c675bd4SBorislav Petkov journal = ext4_get_journal(sb, journal_inum); 28196c675bd4SBorislav Petkov if (!journal) 2820ac27a0ecSDave Kleikamp return -EINVAL; 2821ac27a0ecSDave Kleikamp 2822617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n", 2823ac27a0ecSDave Kleikamp journal_inum); 2824ac27a0ecSDave Kleikamp 28256c675bd4SBorislav Petkov err = jbd2_journal_create(journal); 28266c675bd4SBorislav Petkov if (err) { 2827617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: error creating journal.\n"); 2828dab291afSMingming Cao jbd2_journal_destroy(journal); 2829ac27a0ecSDave Kleikamp return -EIO; 2830ac27a0ecSDave Kleikamp } 2831ac27a0ecSDave Kleikamp 2832617ba13bSMingming Cao EXT4_SB(sb)->s_journal = journal; 2833ac27a0ecSDave Kleikamp 2834617ba13bSMingming Cao ext4_update_dynamic_rev(sb); 2835617ba13bSMingming Cao EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2836617ba13bSMingming Cao EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL); 2837ac27a0ecSDave Kleikamp 2838ac27a0ecSDave Kleikamp es->s_journal_inum = cpu_to_le32(journal_inum); 2839ac27a0ecSDave Kleikamp sb->s_dirt = 1; 2840ac27a0ecSDave Kleikamp 2841ac27a0ecSDave Kleikamp /* Make sure we flush the recovery flag to disk. */ 2842617ba13bSMingming Cao ext4_commit_super(sb, es, 1); 2843ac27a0ecSDave Kleikamp 2844ac27a0ecSDave Kleikamp return 0; 2845ac27a0ecSDave Kleikamp } 2846ac27a0ecSDave Kleikamp 2847617ba13bSMingming Cao static void ext4_commit_super(struct super_block *sb, 28482b2d6d01STheodore Ts'o struct ext4_super_block *es, int sync) 2849ac27a0ecSDave Kleikamp { 2850617ba13bSMingming Cao struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; 2851ac27a0ecSDave Kleikamp 2852ac27a0ecSDave Kleikamp if (!sbh) 2853ac27a0ecSDave Kleikamp return; 2854914258bfSTheodore Ts'o if (buffer_write_io_error(sbh)) { 2855914258bfSTheodore Ts'o /* 2856914258bfSTheodore Ts'o * Oh, dear. A previous attempt to write the 2857914258bfSTheodore Ts'o * superblock failed. This could happen because the 2858914258bfSTheodore Ts'o * USB device was yanked out. Or it could happen to 2859914258bfSTheodore Ts'o * be a transient write error and maybe the block will 2860914258bfSTheodore Ts'o * be remapped. Nothing we can do but to retry the 2861914258bfSTheodore Ts'o * write and hope for the best. 2862914258bfSTheodore Ts'o */ 2863914258bfSTheodore Ts'o printk(KERN_ERR "ext4: previous I/O error to " 2864914258bfSTheodore Ts'o "superblock detected for %s.\n", sb->s_id); 2865914258bfSTheodore Ts'o clear_buffer_write_io_error(sbh); 2866914258bfSTheodore Ts'o set_buffer_uptodate(sbh); 2867914258bfSTheodore Ts'o } 2868ac27a0ecSDave Kleikamp es->s_wtime = cpu_to_le32(get_seconds()); 2869bd81d8eeSLaurent Vivier ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb)); 2870617ba13bSMingming Cao es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb)); 2871ac27a0ecSDave Kleikamp BUFFER_TRACE(sbh, "marking dirty"); 2872ac27a0ecSDave Kleikamp mark_buffer_dirty(sbh); 2873914258bfSTheodore Ts'o if (sync) { 2874ac27a0ecSDave Kleikamp sync_dirty_buffer(sbh); 2875914258bfSTheodore Ts'o if (buffer_write_io_error(sbh)) { 2876914258bfSTheodore Ts'o printk(KERN_ERR "ext4: I/O error while writing " 2877914258bfSTheodore Ts'o "superblock for %s.\n", sb->s_id); 2878914258bfSTheodore Ts'o clear_buffer_write_io_error(sbh); 2879914258bfSTheodore Ts'o set_buffer_uptodate(sbh); 2880914258bfSTheodore Ts'o } 2881914258bfSTheodore Ts'o } 2882ac27a0ecSDave Kleikamp } 2883ac27a0ecSDave Kleikamp 2884ac27a0ecSDave Kleikamp 2885ac27a0ecSDave Kleikamp /* 2886ac27a0ecSDave Kleikamp * Have we just finished recovery? If so, and if we are mounting (or 2887ac27a0ecSDave Kleikamp * remounting) the filesystem readonly, then we will end up with a 2888ac27a0ecSDave Kleikamp * consistent fs on disk. Record that fact. 2889ac27a0ecSDave Kleikamp */ 2890617ba13bSMingming Cao static void ext4_mark_recovery_complete(struct super_block *sb, 2891617ba13bSMingming Cao struct ext4_super_block *es) 2892ac27a0ecSDave Kleikamp { 2893617ba13bSMingming Cao journal_t *journal = EXT4_SB(sb)->s_journal; 2894ac27a0ecSDave Kleikamp 28950390131bSFrank Mayhar if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 28960390131bSFrank Mayhar BUG_ON(journal != NULL); 28970390131bSFrank Mayhar return; 28980390131bSFrank Mayhar } 2899dab291afSMingming Cao jbd2_journal_lock_updates(journal); 29007ffe1ea8SHidehiro Kawai if (jbd2_journal_flush(journal) < 0) 29017ffe1ea8SHidehiro Kawai goto out; 29027ffe1ea8SHidehiro Kawai 290332c37730SJan Kara lock_super(sb); 2904617ba13bSMingming Cao if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && 2905ac27a0ecSDave Kleikamp sb->s_flags & MS_RDONLY) { 2906617ba13bSMingming Cao EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2907ac27a0ecSDave Kleikamp sb->s_dirt = 0; 2908617ba13bSMingming Cao ext4_commit_super(sb, es, 1); 2909ac27a0ecSDave Kleikamp } 291032c37730SJan Kara unlock_super(sb); 29117ffe1ea8SHidehiro Kawai 29127ffe1ea8SHidehiro Kawai out: 2913dab291afSMingming Cao jbd2_journal_unlock_updates(journal); 2914ac27a0ecSDave Kleikamp } 2915ac27a0ecSDave Kleikamp 2916ac27a0ecSDave Kleikamp /* 2917ac27a0ecSDave Kleikamp * If we are mounting (or read-write remounting) a filesystem whose journal 2918ac27a0ecSDave Kleikamp * has recorded an error from a previous lifetime, move that error to the 2919ac27a0ecSDave Kleikamp * main filesystem now. 2920ac27a0ecSDave Kleikamp */ 2921617ba13bSMingming Cao static void ext4_clear_journal_err(struct super_block *sb, 2922617ba13bSMingming Cao struct ext4_super_block *es) 2923ac27a0ecSDave Kleikamp { 2924ac27a0ecSDave Kleikamp journal_t *journal; 2925ac27a0ecSDave Kleikamp int j_errno; 2926ac27a0ecSDave Kleikamp const char *errstr; 2927ac27a0ecSDave Kleikamp 29280390131bSFrank Mayhar BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 29290390131bSFrank Mayhar 2930617ba13bSMingming Cao journal = EXT4_SB(sb)->s_journal; 2931ac27a0ecSDave Kleikamp 2932ac27a0ecSDave Kleikamp /* 2933ac27a0ecSDave Kleikamp * Now check for any error status which may have been recorded in the 2934617ba13bSMingming Cao * journal by a prior ext4_error() or ext4_abort() 2935ac27a0ecSDave Kleikamp */ 2936ac27a0ecSDave Kleikamp 2937dab291afSMingming Cao j_errno = jbd2_journal_errno(journal); 2938ac27a0ecSDave Kleikamp if (j_errno) { 2939ac27a0ecSDave Kleikamp char nbuf[16]; 2940ac27a0ecSDave Kleikamp 2941617ba13bSMingming Cao errstr = ext4_decode_error(sb, j_errno, nbuf); 294246e665e9SHarvey Harrison ext4_warning(sb, __func__, "Filesystem error recorded " 2943ac27a0ecSDave Kleikamp "from previous mount: %s", errstr); 294446e665e9SHarvey Harrison ext4_warning(sb, __func__, "Marking fs in need of " 2945ac27a0ecSDave Kleikamp "filesystem check."); 2946ac27a0ecSDave Kleikamp 2947617ba13bSMingming Cao EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 2948617ba13bSMingming Cao es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 2949617ba13bSMingming Cao ext4_commit_super(sb, es, 1); 2950ac27a0ecSDave Kleikamp 2951dab291afSMingming Cao jbd2_journal_clear_err(journal); 2952ac27a0ecSDave Kleikamp } 2953ac27a0ecSDave Kleikamp } 2954ac27a0ecSDave Kleikamp 2955ac27a0ecSDave Kleikamp /* 2956ac27a0ecSDave Kleikamp * Force the running and committing transactions to commit, 2957ac27a0ecSDave Kleikamp * and wait on the commit. 2958ac27a0ecSDave Kleikamp */ 2959617ba13bSMingming Cao int ext4_force_commit(struct super_block *sb) 2960ac27a0ecSDave Kleikamp { 2961ac27a0ecSDave Kleikamp journal_t *journal; 29620390131bSFrank Mayhar int ret = 0; 2963ac27a0ecSDave Kleikamp 2964ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) 2965ac27a0ecSDave Kleikamp return 0; 2966ac27a0ecSDave Kleikamp 2967617ba13bSMingming Cao journal = EXT4_SB(sb)->s_journal; 29680390131bSFrank Mayhar if (journal) { 2969ac27a0ecSDave Kleikamp sb->s_dirt = 0; 2970617ba13bSMingming Cao ret = ext4_journal_force_commit(journal); 29710390131bSFrank Mayhar } 29720390131bSFrank Mayhar 2973ac27a0ecSDave Kleikamp return ret; 2974ac27a0ecSDave Kleikamp } 2975ac27a0ecSDave Kleikamp 2976ac27a0ecSDave Kleikamp /* 2977617ba13bSMingming Cao * Ext4 always journals updates to the superblock itself, so we don't 2978ac27a0ecSDave Kleikamp * have to propagate any other updates to the superblock on disk at this 297914ce0cb4STheodore Ts'o * point. (We can probably nuke this function altogether, and remove 298014ce0cb4STheodore Ts'o * any mention to sb->s_dirt in all of fs/ext4; eventual cleanup...) 2981ac27a0ecSDave Kleikamp */ 2982617ba13bSMingming Cao static void ext4_write_super(struct super_block *sb) 2983ac27a0ecSDave Kleikamp { 29840390131bSFrank Mayhar if (EXT4_SB(sb)->s_journal) { 2985ac27a0ecSDave Kleikamp if (mutex_trylock(&sb->s_lock) != 0) 2986ac27a0ecSDave Kleikamp BUG(); 2987ac27a0ecSDave Kleikamp sb->s_dirt = 0; 29880390131bSFrank Mayhar } else { 29890390131bSFrank Mayhar ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); 29900390131bSFrank Mayhar } 2991ac27a0ecSDave Kleikamp } 2992ac27a0ecSDave Kleikamp 2993617ba13bSMingming Cao static int ext4_sync_fs(struct super_block *sb, int wait) 2994ac27a0ecSDave Kleikamp { 299514ce0cb4STheodore Ts'o int ret = 0; 2996ac27a0ecSDave Kleikamp 2997ede86cc4STheodore Ts'o trace_mark(ext4_sync_fs, "dev %s wait %d", sb->s_id, wait); 2998ac27a0ecSDave Kleikamp sb->s_dirt = 0; 29990390131bSFrank Mayhar if (EXT4_SB(sb)->s_journal) { 3000ac27a0ecSDave Kleikamp if (wait) 300114ce0cb4STheodore Ts'o ret = ext4_force_commit(sb); 300214ce0cb4STheodore Ts'o else 300314ce0cb4STheodore Ts'o jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, NULL); 30040390131bSFrank Mayhar } else { 30050390131bSFrank Mayhar ext4_commit_super(sb, EXT4_SB(sb)->s_es, wait); 30060390131bSFrank Mayhar } 300714ce0cb4STheodore Ts'o return ret; 3008ac27a0ecSDave Kleikamp } 3009ac27a0ecSDave Kleikamp 3010ac27a0ecSDave Kleikamp /* 3011ac27a0ecSDave Kleikamp * LVM calls this function before a (read-only) snapshot is created. This 3012ac27a0ecSDave Kleikamp * gives us a chance to flush the journal completely and mark the fs clean. 3013ac27a0ecSDave Kleikamp */ 3014617ba13bSMingming Cao static void ext4_write_super_lockfs(struct super_block *sb) 3015ac27a0ecSDave Kleikamp { 3016ac27a0ecSDave Kleikamp sb->s_dirt = 0; 3017ac27a0ecSDave Kleikamp 3018ac27a0ecSDave Kleikamp if (!(sb->s_flags & MS_RDONLY)) { 3019617ba13bSMingming Cao journal_t *journal = EXT4_SB(sb)->s_journal; 3020ac27a0ecSDave Kleikamp 30210390131bSFrank Mayhar if (journal) { 3022ac27a0ecSDave Kleikamp /* Now we set up the journal barrier. */ 3023dab291afSMingming Cao jbd2_journal_lock_updates(journal); 30247ffe1ea8SHidehiro Kawai 30257ffe1ea8SHidehiro Kawai /* 30260390131bSFrank Mayhar * We don't want to clear needs_recovery flag when we 30270390131bSFrank Mayhar * failed to flush the journal. 30287ffe1ea8SHidehiro Kawai */ 30297ffe1ea8SHidehiro Kawai if (jbd2_journal_flush(journal) < 0) 30307ffe1ea8SHidehiro Kawai return; 30310390131bSFrank Mayhar } 3032ac27a0ecSDave Kleikamp 3033ac27a0ecSDave Kleikamp /* Journal blocked and flushed, clear needs_recovery flag. */ 3034617ba13bSMingming Cao EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 3035617ba13bSMingming Cao ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); 3036ac27a0ecSDave Kleikamp } 3037ac27a0ecSDave Kleikamp } 3038ac27a0ecSDave Kleikamp 3039ac27a0ecSDave Kleikamp /* 3040ac27a0ecSDave Kleikamp * Called by LVM after the snapshot is done. We need to reset the RECOVER 3041ac27a0ecSDave Kleikamp * flag here, even though the filesystem is not technically dirty yet. 3042ac27a0ecSDave Kleikamp */ 3043617ba13bSMingming Cao static void ext4_unlockfs(struct super_block *sb) 3044ac27a0ecSDave Kleikamp { 30450390131bSFrank Mayhar if (EXT4_SB(sb)->s_journal && !(sb->s_flags & MS_RDONLY)) { 3046ac27a0ecSDave Kleikamp lock_super(sb); 3047ac27a0ecSDave Kleikamp /* Reser the needs_recovery flag before the fs is unlocked. */ 3048617ba13bSMingming Cao EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 3049617ba13bSMingming Cao ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); 3050ac27a0ecSDave Kleikamp unlock_super(sb); 3051dab291afSMingming Cao jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 3052ac27a0ecSDave Kleikamp } 3053ac27a0ecSDave Kleikamp } 3054ac27a0ecSDave Kleikamp 3055617ba13bSMingming Cao static int ext4_remount(struct super_block *sb, int *flags, char *data) 3056ac27a0ecSDave Kleikamp { 3057617ba13bSMingming Cao struct ext4_super_block *es; 3058617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 3059617ba13bSMingming Cao ext4_fsblk_t n_blocks_count = 0; 3060ac27a0ecSDave Kleikamp unsigned long old_sb_flags; 3061617ba13bSMingming Cao struct ext4_mount_options old_opts; 30628a266467STheodore Ts'o ext4_group_t g; 3063ac27a0ecSDave Kleikamp int err; 3064ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 3065ac27a0ecSDave Kleikamp int i; 3066ac27a0ecSDave Kleikamp #endif 3067ac27a0ecSDave Kleikamp 3068ac27a0ecSDave Kleikamp /* Store the original options */ 3069ac27a0ecSDave Kleikamp old_sb_flags = sb->s_flags; 3070ac27a0ecSDave Kleikamp old_opts.s_mount_opt = sbi->s_mount_opt; 3071ac27a0ecSDave Kleikamp old_opts.s_resuid = sbi->s_resuid; 3072ac27a0ecSDave Kleikamp old_opts.s_resgid = sbi->s_resgid; 3073ac27a0ecSDave Kleikamp old_opts.s_commit_interval = sbi->s_commit_interval; 307430773840STheodore Ts'o old_opts.s_min_batch_time = sbi->s_min_batch_time; 307530773840STheodore Ts'o old_opts.s_max_batch_time = sbi->s_max_batch_time; 3076ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 3077ac27a0ecSDave Kleikamp old_opts.s_jquota_fmt = sbi->s_jquota_fmt; 3078ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) 3079ac27a0ecSDave Kleikamp old_opts.s_qf_names[i] = sbi->s_qf_names[i]; 3080ac27a0ecSDave Kleikamp #endif 3081ac27a0ecSDave Kleikamp 3082ac27a0ecSDave Kleikamp /* 3083ac27a0ecSDave Kleikamp * Allow the "check" option to be passed as a remount option. 3084ac27a0ecSDave Kleikamp */ 3085ac27a0ecSDave Kleikamp if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) { 3086ac27a0ecSDave Kleikamp err = -EINVAL; 3087ac27a0ecSDave Kleikamp goto restore_opts; 3088ac27a0ecSDave Kleikamp } 3089ac27a0ecSDave Kleikamp 3090617ba13bSMingming Cao if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) 309146e665e9SHarvey Harrison ext4_abort(sb, __func__, "Abort forced by user"); 3092ac27a0ecSDave Kleikamp 3093ac27a0ecSDave Kleikamp sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 3094617ba13bSMingming Cao ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 3095ac27a0ecSDave Kleikamp 3096ac27a0ecSDave Kleikamp es = sbi->s_es; 3097ac27a0ecSDave Kleikamp 30980390131bSFrank Mayhar if (sbi->s_journal) 3099617ba13bSMingming Cao ext4_init_journal_params(sb, sbi->s_journal); 3100ac27a0ecSDave Kleikamp 3101ac27a0ecSDave Kleikamp if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || 3102bd81d8eeSLaurent Vivier n_blocks_count > ext4_blocks_count(es)) { 3103617ba13bSMingming Cao if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) { 3104ac27a0ecSDave Kleikamp err = -EROFS; 3105ac27a0ecSDave Kleikamp goto restore_opts; 3106ac27a0ecSDave Kleikamp } 3107ac27a0ecSDave Kleikamp 3108ac27a0ecSDave Kleikamp if (*flags & MS_RDONLY) { 3109ac27a0ecSDave Kleikamp /* 3110ac27a0ecSDave Kleikamp * First of all, the unconditional stuff we have to do 3111ac27a0ecSDave Kleikamp * to disable replay of the journal when we next remount 3112ac27a0ecSDave Kleikamp */ 3113ac27a0ecSDave Kleikamp sb->s_flags |= MS_RDONLY; 3114ac27a0ecSDave Kleikamp 3115ac27a0ecSDave Kleikamp /* 3116ac27a0ecSDave Kleikamp * OK, test if we are remounting a valid rw partition 3117ac27a0ecSDave Kleikamp * readonly, and if so set the rdonly flag and then 3118ac27a0ecSDave Kleikamp * mark the partition as valid again. 3119ac27a0ecSDave Kleikamp */ 3120617ba13bSMingming Cao if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && 3121617ba13bSMingming Cao (sbi->s_mount_state & EXT4_VALID_FS)) 3122ac27a0ecSDave Kleikamp es->s_state = cpu_to_le16(sbi->s_mount_state); 3123ac27a0ecSDave Kleikamp 312432c37730SJan Kara /* 312532c37730SJan Kara * We have to unlock super so that we can wait for 312632c37730SJan Kara * transactions. 312732c37730SJan Kara */ 31280390131bSFrank Mayhar if (sbi->s_journal) { 312932c37730SJan Kara unlock_super(sb); 3130617ba13bSMingming Cao ext4_mark_recovery_complete(sb, es); 313132c37730SJan Kara lock_super(sb); 31320390131bSFrank Mayhar } 3133ac27a0ecSDave Kleikamp } else { 3134ac27a0ecSDave Kleikamp __le32 ret; 3135617ba13bSMingming Cao if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb, 3136617ba13bSMingming Cao ~EXT4_FEATURE_RO_COMPAT_SUPP))) { 3137617ba13bSMingming Cao printk(KERN_WARNING "EXT4-fs: %s: couldn't " 3138ac27a0ecSDave Kleikamp "remount RDWR because of unsupported " 3139ac27a0ecSDave Kleikamp "optional features (%x).\n", 3140ac27a0ecSDave Kleikamp sb->s_id, le32_to_cpu(ret)); 3141ac27a0ecSDave Kleikamp err = -EROFS; 3142ac27a0ecSDave Kleikamp goto restore_opts; 3143ac27a0ecSDave Kleikamp } 3144ead6596bSEric Sandeen 3145ead6596bSEric Sandeen /* 31468a266467STheodore Ts'o * Make sure the group descriptor checksums 31478a266467STheodore Ts'o * are sane. If they aren't, refuse to 31488a266467STheodore Ts'o * remount r/w. 31498a266467STheodore Ts'o */ 31508a266467STheodore Ts'o for (g = 0; g < sbi->s_groups_count; g++) { 31518a266467STheodore Ts'o struct ext4_group_desc *gdp = 31528a266467STheodore Ts'o ext4_get_group_desc(sb, g, NULL); 31538a266467STheodore Ts'o 31548a266467STheodore Ts'o if (!ext4_group_desc_csum_verify(sbi, g, gdp)) { 31558a266467STheodore Ts'o printk(KERN_ERR 31568a266467STheodore Ts'o "EXT4-fs: ext4_remount: " 31578a266467STheodore Ts'o "Checksum for group %lu failed (%u!=%u)\n", 31588a266467STheodore Ts'o g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)), 31598a266467STheodore Ts'o le16_to_cpu(gdp->bg_checksum)); 31608a266467STheodore Ts'o err = -EINVAL; 31618a266467STheodore Ts'o goto restore_opts; 31628a266467STheodore Ts'o } 31638a266467STheodore Ts'o } 31648a266467STheodore Ts'o 31658a266467STheodore Ts'o /* 3166ead6596bSEric Sandeen * If we have an unprocessed orphan list hanging 3167ead6596bSEric Sandeen * around from a previously readonly bdev mount, 3168ead6596bSEric Sandeen * require a full umount/remount for now. 3169ead6596bSEric Sandeen */ 3170ead6596bSEric Sandeen if (es->s_last_orphan) { 3171ead6596bSEric Sandeen printk(KERN_WARNING "EXT4-fs: %s: couldn't " 3172ead6596bSEric Sandeen "remount RDWR because of unprocessed " 3173ead6596bSEric Sandeen "orphan inode list. Please " 3174ead6596bSEric Sandeen "umount/remount instead.\n", 3175ead6596bSEric Sandeen sb->s_id); 3176ead6596bSEric Sandeen err = -EINVAL; 3177ead6596bSEric Sandeen goto restore_opts; 3178ead6596bSEric Sandeen } 3179ead6596bSEric Sandeen 3180ac27a0ecSDave Kleikamp /* 3181ac27a0ecSDave Kleikamp * Mounting a RDONLY partition read-write, so reread 3182ac27a0ecSDave Kleikamp * and store the current valid flag. (It may have 3183ac27a0ecSDave Kleikamp * been changed by e2fsck since we originally mounted 3184ac27a0ecSDave Kleikamp * the partition.) 3185ac27a0ecSDave Kleikamp */ 31860390131bSFrank Mayhar if (sbi->s_journal) 3187617ba13bSMingming Cao ext4_clear_journal_err(sb, es); 3188ac27a0ecSDave Kleikamp sbi->s_mount_state = le16_to_cpu(es->s_state); 3189617ba13bSMingming Cao if ((err = ext4_group_extend(sb, es, n_blocks_count))) 3190ac27a0ecSDave Kleikamp goto restore_opts; 3191617ba13bSMingming Cao if (!ext4_setup_super(sb, es, 0)) 3192ac27a0ecSDave Kleikamp sb->s_flags &= ~MS_RDONLY; 3193ac27a0ecSDave Kleikamp } 3194ac27a0ecSDave Kleikamp } 31950390131bSFrank Mayhar if (sbi->s_journal == NULL) 31960390131bSFrank Mayhar ext4_commit_super(sb, es, 1); 31970390131bSFrank Mayhar 3198ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 3199ac27a0ecSDave Kleikamp /* Release old quota file names */ 3200ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) 3201ac27a0ecSDave Kleikamp if (old_opts.s_qf_names[i] && 3202ac27a0ecSDave Kleikamp old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 3203ac27a0ecSDave Kleikamp kfree(old_opts.s_qf_names[i]); 3204ac27a0ecSDave Kleikamp #endif 3205ac27a0ecSDave Kleikamp return 0; 3206ac27a0ecSDave Kleikamp restore_opts: 3207ac27a0ecSDave Kleikamp sb->s_flags = old_sb_flags; 3208ac27a0ecSDave Kleikamp sbi->s_mount_opt = old_opts.s_mount_opt; 3209ac27a0ecSDave Kleikamp sbi->s_resuid = old_opts.s_resuid; 3210ac27a0ecSDave Kleikamp sbi->s_resgid = old_opts.s_resgid; 3211ac27a0ecSDave Kleikamp sbi->s_commit_interval = old_opts.s_commit_interval; 321230773840STheodore Ts'o sbi->s_min_batch_time = old_opts.s_min_batch_time; 321330773840STheodore Ts'o sbi->s_max_batch_time = old_opts.s_max_batch_time; 3214ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 3215ac27a0ecSDave Kleikamp sbi->s_jquota_fmt = old_opts.s_jquota_fmt; 3216ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) { 3217ac27a0ecSDave Kleikamp if (sbi->s_qf_names[i] && 3218ac27a0ecSDave Kleikamp old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 3219ac27a0ecSDave Kleikamp kfree(sbi->s_qf_names[i]); 3220ac27a0ecSDave Kleikamp sbi->s_qf_names[i] = old_opts.s_qf_names[i]; 3221ac27a0ecSDave Kleikamp } 3222ac27a0ecSDave Kleikamp #endif 3223ac27a0ecSDave Kleikamp return err; 3224ac27a0ecSDave Kleikamp } 3225ac27a0ecSDave Kleikamp 3226617ba13bSMingming Cao static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf) 3227ac27a0ecSDave Kleikamp { 3228ac27a0ecSDave Kleikamp struct super_block *sb = dentry->d_sb; 3229617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 3230617ba13bSMingming Cao struct ext4_super_block *es = sbi->s_es; 3231960cc398SPekka Enberg u64 fsid; 3232ac27a0ecSDave Kleikamp 32335e70030dSBadari Pulavarty if (test_opt(sb, MINIX_DF)) { 32345e70030dSBadari Pulavarty sbi->s_overhead_last = 0; 32356bc9feffSAneesh Kumar K.V } else if (sbi->s_blocks_last != ext4_blocks_count(es)) { 3236fd2d4291SAvantika Mathur ext4_group_t ngroups = sbi->s_groups_count, i; 32375e70030dSBadari Pulavarty ext4_fsblk_t overhead = 0; 3238ac27a0ecSDave Kleikamp smp_rmb(); 3239ac27a0ecSDave Kleikamp 3240ac27a0ecSDave Kleikamp /* 32415e70030dSBadari Pulavarty * Compute the overhead (FS structures). This is constant 32425e70030dSBadari Pulavarty * for a given filesystem unless the number of block groups 32435e70030dSBadari Pulavarty * changes so we cache the previous value until it does. 3244ac27a0ecSDave Kleikamp */ 3245ac27a0ecSDave Kleikamp 3246ac27a0ecSDave Kleikamp /* 3247ac27a0ecSDave Kleikamp * All of the blocks before first_data_block are 3248ac27a0ecSDave Kleikamp * overhead 3249ac27a0ecSDave Kleikamp */ 3250ac27a0ecSDave Kleikamp overhead = le32_to_cpu(es->s_first_data_block); 3251ac27a0ecSDave Kleikamp 3252ac27a0ecSDave Kleikamp /* 3253ac27a0ecSDave Kleikamp * Add the overhead attributed to the superblock and 3254ac27a0ecSDave Kleikamp * block group descriptors. If the sparse superblocks 3255ac27a0ecSDave Kleikamp * feature is turned on, then not all groups have this. 3256ac27a0ecSDave Kleikamp */ 3257ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 3258617ba13bSMingming Cao overhead += ext4_bg_has_super(sb, i) + 3259617ba13bSMingming Cao ext4_bg_num_gdb(sb, i); 3260ac27a0ecSDave Kleikamp cond_resched(); 3261ac27a0ecSDave Kleikamp } 3262ac27a0ecSDave Kleikamp 3263ac27a0ecSDave Kleikamp /* 3264ac27a0ecSDave Kleikamp * Every block group has an inode bitmap, a block 3265ac27a0ecSDave Kleikamp * bitmap, and an inode table. 3266ac27a0ecSDave Kleikamp */ 32675e70030dSBadari Pulavarty overhead += ngroups * (2 + sbi->s_itb_per_group); 32685e70030dSBadari Pulavarty sbi->s_overhead_last = overhead; 32695e70030dSBadari Pulavarty smp_wmb(); 32706bc9feffSAneesh Kumar K.V sbi->s_blocks_last = ext4_blocks_count(es); 3271ac27a0ecSDave Kleikamp } 3272ac27a0ecSDave Kleikamp 3273617ba13bSMingming Cao buf->f_type = EXT4_SUPER_MAGIC; 3274ac27a0ecSDave Kleikamp buf->f_bsize = sb->s_blocksize; 32755e70030dSBadari Pulavarty buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last; 32766bc6e63fSAneesh Kumar K.V buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) - 32776bc6e63fSAneesh Kumar K.V percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter); 3278308ba3ecSAneesh Kumar K.V ext4_free_blocks_count_set(es, buf->f_bfree); 3279bd81d8eeSLaurent Vivier buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); 3280bd81d8eeSLaurent Vivier if (buf->f_bfree < ext4_r_blocks_count(es)) 3281ac27a0ecSDave Kleikamp buf->f_bavail = 0; 3282ac27a0ecSDave Kleikamp buf->f_files = le32_to_cpu(es->s_inodes_count); 328352d9f3b4SPeter Zijlstra buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); 32845e70030dSBadari Pulavarty es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); 3285617ba13bSMingming Cao buf->f_namelen = EXT4_NAME_LEN; 3286960cc398SPekka Enberg fsid = le64_to_cpup((void *)es->s_uuid) ^ 3287960cc398SPekka Enberg le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 3288960cc398SPekka Enberg buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 3289960cc398SPekka Enberg buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 3290ac27a0ecSDave Kleikamp return 0; 3291ac27a0ecSDave Kleikamp } 3292ac27a0ecSDave Kleikamp 3293ac27a0ecSDave Kleikamp /* Helper function for writing quotas on sync - we need to start transaction before quota file 3294ac27a0ecSDave Kleikamp * is locked for write. Otherwise the are possible deadlocks: 3295ac27a0ecSDave Kleikamp * Process 1 Process 2 3296617ba13bSMingming Cao * ext4_create() quota_sync() 3297dab291afSMingming Cao * jbd2_journal_start() write_dquot() 3298ac27a0ecSDave Kleikamp * DQUOT_INIT() down(dqio_mutex) 3299dab291afSMingming Cao * down(dqio_mutex) jbd2_journal_start() 3300ac27a0ecSDave Kleikamp * 3301ac27a0ecSDave Kleikamp */ 3302ac27a0ecSDave Kleikamp 3303ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 3304ac27a0ecSDave Kleikamp 3305ac27a0ecSDave Kleikamp static inline struct inode *dquot_to_inode(struct dquot *dquot) 3306ac27a0ecSDave Kleikamp { 3307ac27a0ecSDave Kleikamp return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; 3308ac27a0ecSDave Kleikamp } 3309ac27a0ecSDave Kleikamp 3310617ba13bSMingming Cao static int ext4_dquot_initialize(struct inode *inode, int type) 3311ac27a0ecSDave Kleikamp { 3312ac27a0ecSDave Kleikamp handle_t *handle; 3313ac27a0ecSDave Kleikamp int ret, err; 3314ac27a0ecSDave Kleikamp 3315ac27a0ecSDave Kleikamp /* We may create quota structure so we need to reserve enough blocks */ 3316617ba13bSMingming Cao handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb)); 3317ac27a0ecSDave Kleikamp if (IS_ERR(handle)) 3318ac27a0ecSDave Kleikamp return PTR_ERR(handle); 3319ac27a0ecSDave Kleikamp ret = dquot_initialize(inode, type); 3320617ba13bSMingming Cao err = ext4_journal_stop(handle); 3321ac27a0ecSDave Kleikamp if (!ret) 3322ac27a0ecSDave Kleikamp ret = err; 3323ac27a0ecSDave Kleikamp return ret; 3324ac27a0ecSDave Kleikamp } 3325ac27a0ecSDave Kleikamp 3326617ba13bSMingming Cao static int ext4_dquot_drop(struct inode *inode) 3327ac27a0ecSDave Kleikamp { 3328ac27a0ecSDave Kleikamp handle_t *handle; 3329ac27a0ecSDave Kleikamp int ret, err; 3330ac27a0ecSDave Kleikamp 3331ac27a0ecSDave Kleikamp /* We may delete quota structure so we need to reserve enough blocks */ 3332617ba13bSMingming Cao handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb)); 33332887df13SJan Kara if (IS_ERR(handle)) { 33342887df13SJan Kara /* 33352887df13SJan Kara * We call dquot_drop() anyway to at least release references 33362887df13SJan Kara * to quota structures so that umount does not hang. 33372887df13SJan Kara */ 33382887df13SJan Kara dquot_drop(inode); 3339ac27a0ecSDave Kleikamp return PTR_ERR(handle); 33402887df13SJan Kara } 3341ac27a0ecSDave Kleikamp ret = dquot_drop(inode); 3342617ba13bSMingming Cao err = ext4_journal_stop(handle); 3343ac27a0ecSDave Kleikamp if (!ret) 3344ac27a0ecSDave Kleikamp ret = err; 3345ac27a0ecSDave Kleikamp return ret; 3346ac27a0ecSDave Kleikamp } 3347ac27a0ecSDave Kleikamp 3348617ba13bSMingming Cao static int ext4_write_dquot(struct dquot *dquot) 3349ac27a0ecSDave Kleikamp { 3350ac27a0ecSDave Kleikamp int ret, err; 3351ac27a0ecSDave Kleikamp handle_t *handle; 3352ac27a0ecSDave Kleikamp struct inode *inode; 3353ac27a0ecSDave Kleikamp 3354ac27a0ecSDave Kleikamp inode = dquot_to_inode(dquot); 3355617ba13bSMingming Cao handle = ext4_journal_start(inode, 3356617ba13bSMingming Cao EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 3357ac27a0ecSDave Kleikamp if (IS_ERR(handle)) 3358ac27a0ecSDave Kleikamp return PTR_ERR(handle); 3359ac27a0ecSDave Kleikamp ret = dquot_commit(dquot); 3360617ba13bSMingming Cao err = ext4_journal_stop(handle); 3361ac27a0ecSDave Kleikamp if (!ret) 3362ac27a0ecSDave Kleikamp ret = err; 3363ac27a0ecSDave Kleikamp return ret; 3364ac27a0ecSDave Kleikamp } 3365ac27a0ecSDave Kleikamp 3366617ba13bSMingming Cao static int ext4_acquire_dquot(struct dquot *dquot) 3367ac27a0ecSDave Kleikamp { 3368ac27a0ecSDave Kleikamp int ret, err; 3369ac27a0ecSDave Kleikamp handle_t *handle; 3370ac27a0ecSDave Kleikamp 3371617ba13bSMingming Cao handle = ext4_journal_start(dquot_to_inode(dquot), 3372617ba13bSMingming Cao EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 3373ac27a0ecSDave Kleikamp if (IS_ERR(handle)) 3374ac27a0ecSDave Kleikamp return PTR_ERR(handle); 3375ac27a0ecSDave Kleikamp ret = dquot_acquire(dquot); 3376617ba13bSMingming Cao err = ext4_journal_stop(handle); 3377ac27a0ecSDave Kleikamp if (!ret) 3378ac27a0ecSDave Kleikamp ret = err; 3379ac27a0ecSDave Kleikamp return ret; 3380ac27a0ecSDave Kleikamp } 3381ac27a0ecSDave Kleikamp 3382617ba13bSMingming Cao static int ext4_release_dquot(struct dquot *dquot) 3383ac27a0ecSDave Kleikamp { 3384ac27a0ecSDave Kleikamp int ret, err; 3385ac27a0ecSDave Kleikamp handle_t *handle; 3386ac27a0ecSDave Kleikamp 3387617ba13bSMingming Cao handle = ext4_journal_start(dquot_to_inode(dquot), 3388617ba13bSMingming Cao EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 33899c3013e9SJan Kara if (IS_ERR(handle)) { 33909c3013e9SJan Kara /* Release dquot anyway to avoid endless cycle in dqput() */ 33919c3013e9SJan Kara dquot_release(dquot); 3392ac27a0ecSDave Kleikamp return PTR_ERR(handle); 33939c3013e9SJan Kara } 3394ac27a0ecSDave Kleikamp ret = dquot_release(dquot); 3395617ba13bSMingming Cao err = ext4_journal_stop(handle); 3396ac27a0ecSDave Kleikamp if (!ret) 3397ac27a0ecSDave Kleikamp ret = err; 3398ac27a0ecSDave Kleikamp return ret; 3399ac27a0ecSDave Kleikamp } 3400ac27a0ecSDave Kleikamp 3401617ba13bSMingming Cao static int ext4_mark_dquot_dirty(struct dquot *dquot) 3402ac27a0ecSDave Kleikamp { 34032c8be6b2SJan Kara /* Are we journaling quotas? */ 3404617ba13bSMingming Cao if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || 3405617ba13bSMingming Cao EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { 3406ac27a0ecSDave Kleikamp dquot_mark_dquot_dirty(dquot); 3407617ba13bSMingming Cao return ext4_write_dquot(dquot); 3408ac27a0ecSDave Kleikamp } else { 3409ac27a0ecSDave Kleikamp return dquot_mark_dquot_dirty(dquot); 3410ac27a0ecSDave Kleikamp } 3411ac27a0ecSDave Kleikamp } 3412ac27a0ecSDave Kleikamp 3413617ba13bSMingming Cao static int ext4_write_info(struct super_block *sb, int type) 3414ac27a0ecSDave Kleikamp { 3415ac27a0ecSDave Kleikamp int ret, err; 3416ac27a0ecSDave Kleikamp handle_t *handle; 3417ac27a0ecSDave Kleikamp 3418ac27a0ecSDave Kleikamp /* Data block + inode block */ 3419617ba13bSMingming Cao handle = ext4_journal_start(sb->s_root->d_inode, 2); 3420ac27a0ecSDave Kleikamp if (IS_ERR(handle)) 3421ac27a0ecSDave Kleikamp return PTR_ERR(handle); 3422ac27a0ecSDave Kleikamp ret = dquot_commit_info(sb, type); 3423617ba13bSMingming Cao err = ext4_journal_stop(handle); 3424ac27a0ecSDave Kleikamp if (!ret) 3425ac27a0ecSDave Kleikamp ret = err; 3426ac27a0ecSDave Kleikamp return ret; 3427ac27a0ecSDave Kleikamp } 3428ac27a0ecSDave Kleikamp 3429ac27a0ecSDave Kleikamp /* 3430ac27a0ecSDave Kleikamp * Turn on quotas during mount time - we need to find 3431ac27a0ecSDave Kleikamp * the quota file and such... 3432ac27a0ecSDave Kleikamp */ 3433617ba13bSMingming Cao static int ext4_quota_on_mount(struct super_block *sb, int type) 3434ac27a0ecSDave Kleikamp { 3435617ba13bSMingming Cao return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], 3436617ba13bSMingming Cao EXT4_SB(sb)->s_jquota_fmt, type); 3437ac27a0ecSDave Kleikamp } 3438ac27a0ecSDave Kleikamp 3439ac27a0ecSDave Kleikamp /* 3440ac27a0ecSDave Kleikamp * Standard function to be called on quota_on 3441ac27a0ecSDave Kleikamp */ 3442617ba13bSMingming Cao static int ext4_quota_on(struct super_block *sb, int type, int format_id, 34438264613dSAl Viro char *name, int remount) 3444ac27a0ecSDave Kleikamp { 3445ac27a0ecSDave Kleikamp int err; 34468264613dSAl Viro struct path path; 3447ac27a0ecSDave Kleikamp 3448ac27a0ecSDave Kleikamp if (!test_opt(sb, QUOTA)) 3449ac27a0ecSDave Kleikamp return -EINVAL; 34508264613dSAl Viro /* When remounting, no checks are needed and in fact, name is NULL */ 34510623543bSJan Kara if (remount) 34528264613dSAl Viro return vfs_quota_on(sb, type, format_id, name, remount); 34530623543bSJan Kara 34548264613dSAl Viro err = kern_path(name, LOOKUP_FOLLOW, &path); 3455ac27a0ecSDave Kleikamp if (err) 3456ac27a0ecSDave Kleikamp return err; 34570623543bSJan Kara 3458ac27a0ecSDave Kleikamp /* Quotafile not on the same filesystem? */ 34598264613dSAl Viro if (path.mnt->mnt_sb != sb) { 34608264613dSAl Viro path_put(&path); 3461ac27a0ecSDave Kleikamp return -EXDEV; 3462ac27a0ecSDave Kleikamp } 34630623543bSJan Kara /* Journaling quota? */ 34640623543bSJan Kara if (EXT4_SB(sb)->s_qf_names[type]) { 34652b2d6d01STheodore Ts'o /* Quotafile not in fs root? */ 34668264613dSAl Viro if (path.dentry->d_parent != sb->s_root) 3467ac27a0ecSDave Kleikamp printk(KERN_WARNING 3468617ba13bSMingming Cao "EXT4-fs: Quota file not on filesystem root. " 34690623543bSJan Kara "Journaled quota will not work.\n"); 34700623543bSJan Kara } 34710623543bSJan Kara 34720623543bSJan Kara /* 34730623543bSJan Kara * When we journal data on quota file, we have to flush journal to see 34740623543bSJan Kara * all updates to the file when we bypass pagecache... 34750623543bSJan Kara */ 34760390131bSFrank Mayhar if (EXT4_SB(sb)->s_journal && 34770390131bSFrank Mayhar ext4_should_journal_data(path.dentry->d_inode)) { 34780623543bSJan Kara /* 34790623543bSJan Kara * We don't need to lock updates but journal_flush() could 34800623543bSJan Kara * otherwise be livelocked... 34810623543bSJan Kara */ 34820623543bSJan Kara jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 34837ffe1ea8SHidehiro Kawai err = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 34840623543bSJan Kara jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 34857ffe1ea8SHidehiro Kawai if (err) { 34868264613dSAl Viro path_put(&path); 34877ffe1ea8SHidehiro Kawai return err; 34887ffe1ea8SHidehiro Kawai } 34890623543bSJan Kara } 34900623543bSJan Kara 34918264613dSAl Viro err = vfs_quota_on_path(sb, type, format_id, &path); 34928264613dSAl Viro path_put(&path); 349377e69dacSAl Viro return err; 3494ac27a0ecSDave Kleikamp } 3495ac27a0ecSDave Kleikamp 3496ac27a0ecSDave Kleikamp /* Read data from quotafile - avoid pagecache and such because we cannot afford 3497ac27a0ecSDave Kleikamp * acquiring the locks... As quota files are never truncated and quota code 3498ac27a0ecSDave Kleikamp * itself serializes the operations (and noone else should touch the files) 3499ac27a0ecSDave Kleikamp * we don't have to be afraid of races */ 3500617ba13bSMingming Cao static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 3501ac27a0ecSDave Kleikamp size_t len, loff_t off) 3502ac27a0ecSDave Kleikamp { 3503ac27a0ecSDave Kleikamp struct inode *inode = sb_dqopt(sb)->files[type]; 3504725d26d3SAneesh Kumar K.V ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 3505ac27a0ecSDave Kleikamp int err = 0; 3506ac27a0ecSDave Kleikamp int offset = off & (sb->s_blocksize - 1); 3507ac27a0ecSDave Kleikamp int tocopy; 3508ac27a0ecSDave Kleikamp size_t toread; 3509ac27a0ecSDave Kleikamp struct buffer_head *bh; 3510ac27a0ecSDave Kleikamp loff_t i_size = i_size_read(inode); 3511ac27a0ecSDave Kleikamp 3512ac27a0ecSDave Kleikamp if (off > i_size) 3513ac27a0ecSDave Kleikamp return 0; 3514ac27a0ecSDave Kleikamp if (off+len > i_size) 3515ac27a0ecSDave Kleikamp len = i_size-off; 3516ac27a0ecSDave Kleikamp toread = len; 3517ac27a0ecSDave Kleikamp while (toread > 0) { 3518ac27a0ecSDave Kleikamp tocopy = sb->s_blocksize - offset < toread ? 3519ac27a0ecSDave Kleikamp sb->s_blocksize - offset : toread; 3520617ba13bSMingming Cao bh = ext4_bread(NULL, inode, blk, 0, &err); 3521ac27a0ecSDave Kleikamp if (err) 3522ac27a0ecSDave Kleikamp return err; 3523ac27a0ecSDave Kleikamp if (!bh) /* A hole? */ 3524ac27a0ecSDave Kleikamp memset(data, 0, tocopy); 3525ac27a0ecSDave Kleikamp else 3526ac27a0ecSDave Kleikamp memcpy(data, bh->b_data+offset, tocopy); 3527ac27a0ecSDave Kleikamp brelse(bh); 3528ac27a0ecSDave Kleikamp offset = 0; 3529ac27a0ecSDave Kleikamp toread -= tocopy; 3530ac27a0ecSDave Kleikamp data += tocopy; 3531ac27a0ecSDave Kleikamp blk++; 3532ac27a0ecSDave Kleikamp } 3533ac27a0ecSDave Kleikamp return len; 3534ac27a0ecSDave Kleikamp } 3535ac27a0ecSDave Kleikamp 3536ac27a0ecSDave Kleikamp /* Write to quotafile (we know the transaction is already started and has 3537ac27a0ecSDave Kleikamp * enough credits) */ 3538617ba13bSMingming Cao static ssize_t ext4_quota_write(struct super_block *sb, int type, 3539ac27a0ecSDave Kleikamp const char *data, size_t len, loff_t off) 3540ac27a0ecSDave Kleikamp { 3541ac27a0ecSDave Kleikamp struct inode *inode = sb_dqopt(sb)->files[type]; 3542725d26d3SAneesh Kumar K.V ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 3543ac27a0ecSDave Kleikamp int err = 0; 3544ac27a0ecSDave Kleikamp int offset = off & (sb->s_blocksize - 1); 3545ac27a0ecSDave Kleikamp int tocopy; 3546617ba13bSMingming Cao int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL; 3547ac27a0ecSDave Kleikamp size_t towrite = len; 3548ac27a0ecSDave Kleikamp struct buffer_head *bh; 3549ac27a0ecSDave Kleikamp handle_t *handle = journal_current_handle(); 3550ac27a0ecSDave Kleikamp 35510390131bSFrank Mayhar if (EXT4_SB(sb)->s_journal && !handle) { 3552e5f8eab8STheodore Ts'o printk(KERN_WARNING "EXT4-fs: Quota write (off=%llu, len=%llu)" 35539c3013e9SJan Kara " cancelled because transaction is not started.\n", 35549c3013e9SJan Kara (unsigned long long)off, (unsigned long long)len); 35559c3013e9SJan Kara return -EIO; 35569c3013e9SJan Kara } 3557ac27a0ecSDave Kleikamp mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 3558ac27a0ecSDave Kleikamp while (towrite > 0) { 3559ac27a0ecSDave Kleikamp tocopy = sb->s_blocksize - offset < towrite ? 3560ac27a0ecSDave Kleikamp sb->s_blocksize - offset : towrite; 3561617ba13bSMingming Cao bh = ext4_bread(handle, inode, blk, 1, &err); 3562ac27a0ecSDave Kleikamp if (!bh) 3563ac27a0ecSDave Kleikamp goto out; 3564ac27a0ecSDave Kleikamp if (journal_quota) { 3565617ba13bSMingming Cao err = ext4_journal_get_write_access(handle, bh); 3566ac27a0ecSDave Kleikamp if (err) { 3567ac27a0ecSDave Kleikamp brelse(bh); 3568ac27a0ecSDave Kleikamp goto out; 3569ac27a0ecSDave Kleikamp } 3570ac27a0ecSDave Kleikamp } 3571ac27a0ecSDave Kleikamp lock_buffer(bh); 3572ac27a0ecSDave Kleikamp memcpy(bh->b_data+offset, data, tocopy); 3573ac27a0ecSDave Kleikamp flush_dcache_page(bh->b_page); 3574ac27a0ecSDave Kleikamp unlock_buffer(bh); 3575ac27a0ecSDave Kleikamp if (journal_quota) 35760390131bSFrank Mayhar err = ext4_handle_dirty_metadata(handle, NULL, bh); 3577ac27a0ecSDave Kleikamp else { 3578ac27a0ecSDave Kleikamp /* Always do at least ordered writes for quotas */ 3579678aaf48SJan Kara err = ext4_jbd2_file_inode(handle, inode); 3580ac27a0ecSDave Kleikamp mark_buffer_dirty(bh); 3581ac27a0ecSDave Kleikamp } 3582ac27a0ecSDave Kleikamp brelse(bh); 3583ac27a0ecSDave Kleikamp if (err) 3584ac27a0ecSDave Kleikamp goto out; 3585ac27a0ecSDave Kleikamp offset = 0; 3586ac27a0ecSDave Kleikamp towrite -= tocopy; 3587ac27a0ecSDave Kleikamp data += tocopy; 3588ac27a0ecSDave Kleikamp blk++; 3589ac27a0ecSDave Kleikamp } 3590ac27a0ecSDave Kleikamp out: 35914d04e4fbSJan Kara if (len == towrite) { 35924d04e4fbSJan Kara mutex_unlock(&inode->i_mutex); 3593ac27a0ecSDave Kleikamp return err; 35944d04e4fbSJan Kara } 3595ac27a0ecSDave Kleikamp if (inode->i_size < off+len-towrite) { 3596ac27a0ecSDave Kleikamp i_size_write(inode, off+len-towrite); 3597617ba13bSMingming Cao EXT4_I(inode)->i_disksize = inode->i_size; 3598ac27a0ecSDave Kleikamp } 3599ac27a0ecSDave Kleikamp inode->i_mtime = inode->i_ctime = CURRENT_TIME; 3600617ba13bSMingming Cao ext4_mark_inode_dirty(handle, inode); 3601ac27a0ecSDave Kleikamp mutex_unlock(&inode->i_mutex); 3602ac27a0ecSDave Kleikamp return len - towrite; 3603ac27a0ecSDave Kleikamp } 3604ac27a0ecSDave Kleikamp 3605ac27a0ecSDave Kleikamp #endif 3606ac27a0ecSDave Kleikamp 3607617ba13bSMingming Cao static int ext4_get_sb(struct file_system_type *fs_type, 3608ac27a0ecSDave Kleikamp int flags, const char *dev_name, void *data, struct vfsmount *mnt) 3609ac27a0ecSDave Kleikamp { 3610617ba13bSMingming Cao return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt); 3611ac27a0ecSDave Kleikamp } 3612ac27a0ecSDave Kleikamp 36135e8814f2STheodore Ts'o #ifdef CONFIG_PROC_FS 36145e8814f2STheodore Ts'o static int ext4_ui_proc_show(struct seq_file *m, void *v) 36155e8814f2STheodore Ts'o { 36165e8814f2STheodore Ts'o unsigned int *p = m->private; 36175e8814f2STheodore Ts'o 36185e8814f2STheodore Ts'o seq_printf(m, "%u\n", *p); 36195e8814f2STheodore Ts'o return 0; 36205e8814f2STheodore Ts'o } 36215e8814f2STheodore Ts'o 36225e8814f2STheodore Ts'o static int ext4_ui_proc_open(struct inode *inode, struct file *file) 36235e8814f2STheodore Ts'o { 36245e8814f2STheodore Ts'o return single_open(file, ext4_ui_proc_show, PDE(inode)->data); 36255e8814f2STheodore Ts'o } 36265e8814f2STheodore Ts'o 36275e8814f2STheodore Ts'o static ssize_t ext4_ui_proc_write(struct file *file, const char __user *buf, 36285e8814f2STheodore Ts'o size_t cnt, loff_t *ppos) 36295e8814f2STheodore Ts'o { 363023475e26SRoel Kluin unsigned long *p = PDE(file->f_path.dentry->d_inode)->data; 36315e8814f2STheodore Ts'o char str[32]; 36325e8814f2STheodore Ts'o 36335e8814f2STheodore Ts'o if (cnt >= sizeof(str)) 36345e8814f2STheodore Ts'o return -EINVAL; 36355e8814f2STheodore Ts'o if (copy_from_user(str, buf, cnt)) 36365e8814f2STheodore Ts'o return -EFAULT; 363723475e26SRoel Kluin 363823475e26SRoel Kluin *p = simple_strtoul(str, NULL, 0); 36395e8814f2STheodore Ts'o return cnt; 36405e8814f2STheodore Ts'o } 36415e8814f2STheodore Ts'o 36425e8814f2STheodore Ts'o const struct file_operations ext4_ui_proc_fops = { 36435e8814f2STheodore Ts'o .owner = THIS_MODULE, 36445e8814f2STheodore Ts'o .open = ext4_ui_proc_open, 36455e8814f2STheodore Ts'o .read = seq_read, 36465e8814f2STheodore Ts'o .llseek = seq_lseek, 36475e8814f2STheodore Ts'o .release = single_release, 36485e8814f2STheodore Ts'o .write = ext4_ui_proc_write, 36495e8814f2STheodore Ts'o }; 36505e8814f2STheodore Ts'o #endif 36515e8814f2STheodore Ts'o 365203010a33STheodore Ts'o static struct file_system_type ext4_fs_type = { 3653ac27a0ecSDave Kleikamp .owner = THIS_MODULE, 365403010a33STheodore Ts'o .name = "ext4", 3655617ba13bSMingming Cao .get_sb = ext4_get_sb, 3656ac27a0ecSDave Kleikamp .kill_sb = kill_block_super, 3657ac27a0ecSDave Kleikamp .fs_flags = FS_REQUIRES_DEV, 3658ac27a0ecSDave Kleikamp }; 3659ac27a0ecSDave Kleikamp 366003010a33STheodore Ts'o #ifdef CONFIG_EXT4DEV_COMPAT 366103010a33STheodore Ts'o static int ext4dev_get_sb(struct file_system_type *fs_type, 366203010a33STheodore Ts'o int flags, const char *dev_name, void *data, struct vfsmount *mnt) 366303010a33STheodore Ts'o { 366403010a33STheodore Ts'o printk(KERN_WARNING "EXT4-fs: Update your userspace programs " 366503010a33STheodore Ts'o "to mount using ext4\n"); 366603010a33STheodore Ts'o printk(KERN_WARNING "EXT4-fs: ext4dev backwards compatibility " 366703010a33STheodore Ts'o "will go away by 2.6.31\n"); 366803010a33STheodore Ts'o return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt); 366903010a33STheodore Ts'o } 367003010a33STheodore Ts'o 367103010a33STheodore Ts'o static struct file_system_type ext4dev_fs_type = { 367203010a33STheodore Ts'o .owner = THIS_MODULE, 367303010a33STheodore Ts'o .name = "ext4dev", 367403010a33STheodore Ts'o .get_sb = ext4dev_get_sb, 367503010a33STheodore Ts'o .kill_sb = kill_block_super, 367603010a33STheodore Ts'o .fs_flags = FS_REQUIRES_DEV, 367703010a33STheodore Ts'o }; 367803010a33STheodore Ts'o MODULE_ALIAS("ext4dev"); 367903010a33STheodore Ts'o #endif 368003010a33STheodore Ts'o 3681617ba13bSMingming Cao static int __init init_ext4_fs(void) 3682ac27a0ecSDave Kleikamp { 3683c9de560dSAlex Tomas int err; 3684c9de560dSAlex Tomas 36859f6200bbSTheodore Ts'o ext4_proc_root = proc_mkdir("fs/ext4", NULL); 3686c9de560dSAlex Tomas err = init_ext4_mballoc(); 3687ac27a0ecSDave Kleikamp if (err) 3688ac27a0ecSDave Kleikamp return err; 3689c9de560dSAlex Tomas 3690c9de560dSAlex Tomas err = init_ext4_xattr(); 3691c9de560dSAlex Tomas if (err) 3692c9de560dSAlex Tomas goto out2; 3693ac27a0ecSDave Kleikamp err = init_inodecache(); 3694ac27a0ecSDave Kleikamp if (err) 3695ac27a0ecSDave Kleikamp goto out1; 369603010a33STheodore Ts'o err = register_filesystem(&ext4_fs_type); 3697ac27a0ecSDave Kleikamp if (err) 3698ac27a0ecSDave Kleikamp goto out; 369903010a33STheodore Ts'o #ifdef CONFIG_EXT4DEV_COMPAT 370003010a33STheodore Ts'o err = register_filesystem(&ext4dev_fs_type); 370103010a33STheodore Ts'o if (err) { 370203010a33STheodore Ts'o unregister_filesystem(&ext4_fs_type); 370303010a33STheodore Ts'o goto out; 370403010a33STheodore Ts'o } 370503010a33STheodore Ts'o #endif 3706ac27a0ecSDave Kleikamp return 0; 3707ac27a0ecSDave Kleikamp out: 3708ac27a0ecSDave Kleikamp destroy_inodecache(); 3709ac27a0ecSDave Kleikamp out1: 3710617ba13bSMingming Cao exit_ext4_xattr(); 3711c9de560dSAlex Tomas out2: 3712c9de560dSAlex Tomas exit_ext4_mballoc(); 3713ac27a0ecSDave Kleikamp return err; 3714ac27a0ecSDave Kleikamp } 3715ac27a0ecSDave Kleikamp 3716617ba13bSMingming Cao static void __exit exit_ext4_fs(void) 3717ac27a0ecSDave Kleikamp { 371803010a33STheodore Ts'o unregister_filesystem(&ext4_fs_type); 371903010a33STheodore Ts'o #ifdef CONFIG_EXT4DEV_COMPAT 3720617ba13bSMingming Cao unregister_filesystem(&ext4dev_fs_type); 372103010a33STheodore Ts'o #endif 3722ac27a0ecSDave Kleikamp destroy_inodecache(); 3723617ba13bSMingming Cao exit_ext4_xattr(); 3724c9de560dSAlex Tomas exit_ext4_mballoc(); 37259f6200bbSTheodore Ts'o remove_proc_entry("fs/ext4", NULL); 3726ac27a0ecSDave Kleikamp } 3727ac27a0ecSDave Kleikamp 3728ac27a0ecSDave Kleikamp MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); 3729617ba13bSMingming Cao MODULE_DESCRIPTION("Fourth Extended Filesystem with extents"); 3730ac27a0ecSDave Kleikamp MODULE_LICENSE("GPL"); 3731617ba13bSMingming Cao module_init(init_ext4_fs) 3732617ba13bSMingming Cao module_exit(exit_ext4_fs) 3733