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> 24617ba13bSMingming Cao #include <linux/ext4_fs.h> 25dab291afSMingming Cao #include <linux/ext4_jbd2.h> 26ac27a0ecSDave Kleikamp #include <linux/slab.h> 27ac27a0ecSDave Kleikamp #include <linux/init.h> 28ac27a0ecSDave Kleikamp #include <linux/blkdev.h> 29ac27a0ecSDave Kleikamp #include <linux/parser.h> 30ac27a0ecSDave Kleikamp #include <linux/smp_lock.h> 31ac27a0ecSDave Kleikamp #include <linux/buffer_head.h> 32a5694255SChristoph Hellwig #include <linux/exportfs.h> 33ac27a0ecSDave Kleikamp #include <linux/vfs.h> 34ac27a0ecSDave Kleikamp #include <linux/random.h> 35ac27a0ecSDave Kleikamp #include <linux/mount.h> 36ac27a0ecSDave Kleikamp #include <linux/namei.h> 37ac27a0ecSDave Kleikamp #include <linux/quotaops.h> 38ac27a0ecSDave Kleikamp #include <linux/seq_file.h> 391330593eSVignesh Babu #include <linux/log2.h> 40717d50e4SAndreas Dilger #include <linux/crc16.h> 41ac27a0ecSDave Kleikamp 42ac27a0ecSDave Kleikamp #include <asm/uaccess.h> 43ac27a0ecSDave Kleikamp 44ac27a0ecSDave Kleikamp #include "xattr.h" 45ac27a0ecSDave Kleikamp #include "acl.h" 46ac27a0ecSDave Kleikamp #include "namei.h" 47717d50e4SAndreas Dilger #include "group.h" 48ac27a0ecSDave Kleikamp 49617ba13bSMingming Cao static int ext4_load_journal(struct super_block *, struct ext4_super_block *, 50ac27a0ecSDave Kleikamp unsigned long journal_devnum); 51617ba13bSMingming Cao static int ext4_create_journal(struct super_block *, struct ext4_super_block *, 52ac27a0ecSDave Kleikamp unsigned int); 53617ba13bSMingming Cao static void ext4_commit_super (struct super_block * sb, 54617ba13bSMingming Cao struct ext4_super_block * es, 55ac27a0ecSDave Kleikamp int sync); 56617ba13bSMingming Cao static void ext4_mark_recovery_complete(struct super_block * sb, 57617ba13bSMingming Cao struct ext4_super_block * es); 58617ba13bSMingming Cao static void ext4_clear_journal_err(struct super_block * sb, 59617ba13bSMingming Cao struct ext4_super_block * es); 60617ba13bSMingming Cao static int ext4_sync_fs(struct super_block *sb, int wait); 61617ba13bSMingming Cao static const char *ext4_decode_error(struct super_block * sb, int errno, 62ac27a0ecSDave Kleikamp char nbuf[16]); 63617ba13bSMingming Cao static int ext4_remount (struct super_block * sb, int * flags, char * data); 64617ba13bSMingming Cao static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf); 65617ba13bSMingming Cao static void ext4_unlockfs(struct super_block *sb); 66617ba13bSMingming Cao static void ext4_write_super (struct super_block * sb); 67617ba13bSMingming Cao static void ext4_write_super_lockfs(struct super_block *sb); 68ac27a0ecSDave Kleikamp 69bd81d8eeSLaurent Vivier 708fadc143SAlexandre Ratchov ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 718fadc143SAlexandre Ratchov struct ext4_group_desc *bg) 72bd81d8eeSLaurent Vivier { 733a14589cSAneesh Kumar K.V return le32_to_cpu(bg->bg_block_bitmap_lo) | 748fadc143SAlexandre Ratchov (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 758fadc143SAlexandre Ratchov (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); 76bd81d8eeSLaurent Vivier } 77bd81d8eeSLaurent Vivier 788fadc143SAlexandre Ratchov ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 798fadc143SAlexandre Ratchov struct ext4_group_desc *bg) 80bd81d8eeSLaurent Vivier { 815272f837SAneesh Kumar K.V return le32_to_cpu(bg->bg_inode_bitmap_lo) | 828fadc143SAlexandre Ratchov (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 838fadc143SAlexandre Ratchov (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); 84bd81d8eeSLaurent Vivier } 85bd81d8eeSLaurent Vivier 868fadc143SAlexandre Ratchov ext4_fsblk_t ext4_inode_table(struct super_block *sb, 878fadc143SAlexandre Ratchov struct ext4_group_desc *bg) 88bd81d8eeSLaurent Vivier { 895272f837SAneesh Kumar K.V return le32_to_cpu(bg->bg_inode_table_lo) | 908fadc143SAlexandre Ratchov (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 918fadc143SAlexandre Ratchov (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); 92bd81d8eeSLaurent Vivier } 93bd81d8eeSLaurent Vivier 948fadc143SAlexandre Ratchov void ext4_block_bitmap_set(struct super_block *sb, 958fadc143SAlexandre Ratchov struct ext4_group_desc *bg, ext4_fsblk_t blk) 96bd81d8eeSLaurent Vivier { 973a14589cSAneesh Kumar K.V bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); 988fadc143SAlexandre Ratchov if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 998fadc143SAlexandre Ratchov bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); 100bd81d8eeSLaurent Vivier } 101bd81d8eeSLaurent Vivier 1028fadc143SAlexandre Ratchov void ext4_inode_bitmap_set(struct super_block *sb, 1038fadc143SAlexandre Ratchov struct ext4_group_desc *bg, ext4_fsblk_t blk) 104bd81d8eeSLaurent Vivier { 1055272f837SAneesh Kumar K.V bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); 1068fadc143SAlexandre Ratchov if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 1078fadc143SAlexandre Ratchov bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); 108bd81d8eeSLaurent Vivier } 109bd81d8eeSLaurent Vivier 1108fadc143SAlexandre Ratchov void ext4_inode_table_set(struct super_block *sb, 1118fadc143SAlexandre Ratchov struct ext4_group_desc *bg, ext4_fsblk_t blk) 112bd81d8eeSLaurent Vivier { 1135272f837SAneesh Kumar K.V bg->bg_inode_table_lo = cpu_to_le32((u32)blk); 1148fadc143SAlexandre Ratchov if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 1158fadc143SAlexandre Ratchov bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); 116bd81d8eeSLaurent Vivier } 117bd81d8eeSLaurent Vivier 118ac27a0ecSDave Kleikamp /* 119dab291afSMingming Cao * Wrappers for jbd2_journal_start/end. 120ac27a0ecSDave Kleikamp * 121ac27a0ecSDave Kleikamp * The only special thing we need to do here is to make sure that all 122ac27a0ecSDave Kleikamp * journal_end calls result in the superblock being marked dirty, so 123ac27a0ecSDave Kleikamp * that sync() will call the filesystem's write_super callback if 124ac27a0ecSDave Kleikamp * appropriate. 125ac27a0ecSDave Kleikamp */ 126617ba13bSMingming Cao handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) 127ac27a0ecSDave Kleikamp { 128ac27a0ecSDave Kleikamp journal_t *journal; 129ac27a0ecSDave Kleikamp 130ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) 131ac27a0ecSDave Kleikamp return ERR_PTR(-EROFS); 132ac27a0ecSDave Kleikamp 133ac27a0ecSDave Kleikamp /* Special case here: if the journal has aborted behind our 134ac27a0ecSDave Kleikamp * backs (eg. EIO in the commit thread), then we still need to 135ac27a0ecSDave Kleikamp * take the FS itself readonly cleanly. */ 136617ba13bSMingming Cao journal = EXT4_SB(sb)->s_journal; 137ac27a0ecSDave Kleikamp if (is_journal_aborted(journal)) { 138617ba13bSMingming Cao ext4_abort(sb, __FUNCTION__, 139ac27a0ecSDave Kleikamp "Detected aborted journal"); 140ac27a0ecSDave Kleikamp return ERR_PTR(-EROFS); 141ac27a0ecSDave Kleikamp } 142ac27a0ecSDave Kleikamp 143dab291afSMingming Cao return jbd2_journal_start(journal, nblocks); 144ac27a0ecSDave Kleikamp } 145ac27a0ecSDave Kleikamp 146ac27a0ecSDave Kleikamp /* 147ac27a0ecSDave Kleikamp * The only special thing we need to do here is to make sure that all 148dab291afSMingming Cao * jbd2_journal_stop calls result in the superblock being marked dirty, so 149ac27a0ecSDave Kleikamp * that sync() will call the filesystem's write_super callback if 150ac27a0ecSDave Kleikamp * appropriate. 151ac27a0ecSDave Kleikamp */ 152617ba13bSMingming Cao int __ext4_journal_stop(const char *where, handle_t *handle) 153ac27a0ecSDave Kleikamp { 154ac27a0ecSDave Kleikamp struct super_block *sb; 155ac27a0ecSDave Kleikamp int err; 156ac27a0ecSDave Kleikamp int rc; 157ac27a0ecSDave Kleikamp 158ac27a0ecSDave Kleikamp sb = handle->h_transaction->t_journal->j_private; 159ac27a0ecSDave Kleikamp err = handle->h_err; 160dab291afSMingming Cao rc = jbd2_journal_stop(handle); 161ac27a0ecSDave Kleikamp 162ac27a0ecSDave Kleikamp if (!err) 163ac27a0ecSDave Kleikamp err = rc; 164ac27a0ecSDave Kleikamp if (err) 165617ba13bSMingming Cao __ext4_std_error(sb, where, err); 166ac27a0ecSDave Kleikamp return err; 167ac27a0ecSDave Kleikamp } 168ac27a0ecSDave Kleikamp 169617ba13bSMingming Cao void ext4_journal_abort_handle(const char *caller, const char *err_fn, 170ac27a0ecSDave Kleikamp struct buffer_head *bh, handle_t *handle, int err) 171ac27a0ecSDave Kleikamp { 172ac27a0ecSDave Kleikamp char nbuf[16]; 173617ba13bSMingming Cao const char *errstr = ext4_decode_error(NULL, err, nbuf); 174ac27a0ecSDave Kleikamp 175ac27a0ecSDave Kleikamp if (bh) 176ac27a0ecSDave Kleikamp BUFFER_TRACE(bh, "abort"); 177ac27a0ecSDave Kleikamp 178ac27a0ecSDave Kleikamp if (!handle->h_err) 179ac27a0ecSDave Kleikamp handle->h_err = err; 180ac27a0ecSDave Kleikamp 181ac27a0ecSDave Kleikamp if (is_handle_aborted(handle)) 182ac27a0ecSDave Kleikamp return; 183ac27a0ecSDave Kleikamp 184ac27a0ecSDave Kleikamp printk(KERN_ERR "%s: aborting transaction: %s in %s\n", 185ac27a0ecSDave Kleikamp caller, errstr, err_fn); 186ac27a0ecSDave Kleikamp 187dab291afSMingming Cao jbd2_journal_abort_handle(handle); 188ac27a0ecSDave Kleikamp } 189ac27a0ecSDave Kleikamp 190ac27a0ecSDave Kleikamp /* Deal with the reporting of failure conditions on a filesystem such as 191ac27a0ecSDave Kleikamp * inconsistencies detected or read IO failures. 192ac27a0ecSDave Kleikamp * 193ac27a0ecSDave Kleikamp * On ext2, we can store the error state of the filesystem in the 194617ba13bSMingming Cao * superblock. That is not possible on ext4, because we may have other 195ac27a0ecSDave Kleikamp * write ordering constraints on the superblock which prevent us from 196ac27a0ecSDave Kleikamp * writing it out straight away; and given that the journal is about to 197ac27a0ecSDave Kleikamp * be aborted, we can't rely on the current, or future, transactions to 198ac27a0ecSDave Kleikamp * write out the superblock safely. 199ac27a0ecSDave Kleikamp * 200dab291afSMingming Cao * We'll just use the jbd2_journal_abort() error code to record an error in 201ac27a0ecSDave Kleikamp * the journal instead. On recovery, the journal will compain about 202ac27a0ecSDave Kleikamp * that error until we've noted it down and cleared it. 203ac27a0ecSDave Kleikamp */ 204ac27a0ecSDave Kleikamp 205617ba13bSMingming Cao static void ext4_handle_error(struct super_block *sb) 206ac27a0ecSDave Kleikamp { 207617ba13bSMingming Cao struct ext4_super_block *es = EXT4_SB(sb)->s_es; 208ac27a0ecSDave Kleikamp 209617ba13bSMingming Cao EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 210617ba13bSMingming Cao es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 211ac27a0ecSDave Kleikamp 212ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) 213ac27a0ecSDave Kleikamp return; 214ac27a0ecSDave Kleikamp 215ac27a0ecSDave Kleikamp if (!test_opt (sb, ERRORS_CONT)) { 216617ba13bSMingming Cao journal_t *journal = EXT4_SB(sb)->s_journal; 217ac27a0ecSDave Kleikamp 218617ba13bSMingming Cao EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; 219ac27a0ecSDave Kleikamp if (journal) 220dab291afSMingming Cao jbd2_journal_abort(journal, -EIO); 221ac27a0ecSDave Kleikamp } 222ac27a0ecSDave Kleikamp if (test_opt (sb, ERRORS_RO)) { 223ac27a0ecSDave Kleikamp printk (KERN_CRIT "Remounting filesystem read-only\n"); 224ac27a0ecSDave Kleikamp sb->s_flags |= MS_RDONLY; 225ac27a0ecSDave Kleikamp } 226617ba13bSMingming Cao ext4_commit_super(sb, es, 1); 227ac27a0ecSDave Kleikamp if (test_opt(sb, ERRORS_PANIC)) 228617ba13bSMingming Cao panic("EXT4-fs (device %s): panic forced after error\n", 229ac27a0ecSDave Kleikamp sb->s_id); 230ac27a0ecSDave Kleikamp } 231ac27a0ecSDave Kleikamp 232617ba13bSMingming Cao void ext4_error (struct super_block * sb, const char * function, 233ac27a0ecSDave Kleikamp const char * fmt, ...) 234ac27a0ecSDave Kleikamp { 235ac27a0ecSDave Kleikamp va_list args; 236ac27a0ecSDave Kleikamp 237ac27a0ecSDave Kleikamp va_start(args, fmt); 238617ba13bSMingming Cao printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function); 239ac27a0ecSDave Kleikamp vprintk(fmt, args); 240ac27a0ecSDave Kleikamp printk("\n"); 241ac27a0ecSDave Kleikamp va_end(args); 242ac27a0ecSDave Kleikamp 243617ba13bSMingming Cao ext4_handle_error(sb); 244ac27a0ecSDave Kleikamp } 245ac27a0ecSDave Kleikamp 246617ba13bSMingming Cao static const char *ext4_decode_error(struct super_block * sb, int errno, 247ac27a0ecSDave Kleikamp char nbuf[16]) 248ac27a0ecSDave Kleikamp { 249ac27a0ecSDave Kleikamp char *errstr = NULL; 250ac27a0ecSDave Kleikamp 251ac27a0ecSDave Kleikamp switch (errno) { 252ac27a0ecSDave Kleikamp case -EIO: 253ac27a0ecSDave Kleikamp errstr = "IO failure"; 254ac27a0ecSDave Kleikamp break; 255ac27a0ecSDave Kleikamp case -ENOMEM: 256ac27a0ecSDave Kleikamp errstr = "Out of memory"; 257ac27a0ecSDave Kleikamp break; 258ac27a0ecSDave Kleikamp case -EROFS: 259dab291afSMingming Cao if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT) 260ac27a0ecSDave Kleikamp errstr = "Journal has aborted"; 261ac27a0ecSDave Kleikamp else 262ac27a0ecSDave Kleikamp errstr = "Readonly filesystem"; 263ac27a0ecSDave Kleikamp break; 264ac27a0ecSDave Kleikamp default: 265ac27a0ecSDave Kleikamp /* If the caller passed in an extra buffer for unknown 266ac27a0ecSDave Kleikamp * errors, textualise them now. Else we just return 267ac27a0ecSDave Kleikamp * NULL. */ 268ac27a0ecSDave Kleikamp if (nbuf) { 269ac27a0ecSDave Kleikamp /* Check for truncated error codes... */ 270ac27a0ecSDave Kleikamp if (snprintf(nbuf, 16, "error %d", -errno) >= 0) 271ac27a0ecSDave Kleikamp errstr = nbuf; 272ac27a0ecSDave Kleikamp } 273ac27a0ecSDave Kleikamp break; 274ac27a0ecSDave Kleikamp } 275ac27a0ecSDave Kleikamp 276ac27a0ecSDave Kleikamp return errstr; 277ac27a0ecSDave Kleikamp } 278ac27a0ecSDave Kleikamp 279617ba13bSMingming Cao /* __ext4_std_error decodes expected errors from journaling functions 280ac27a0ecSDave Kleikamp * automatically and invokes the appropriate error response. */ 281ac27a0ecSDave Kleikamp 282617ba13bSMingming Cao void __ext4_std_error (struct super_block * sb, const char * function, 283ac27a0ecSDave Kleikamp int errno) 284ac27a0ecSDave Kleikamp { 285ac27a0ecSDave Kleikamp char nbuf[16]; 286ac27a0ecSDave Kleikamp const char *errstr; 287ac27a0ecSDave Kleikamp 288ac27a0ecSDave Kleikamp /* Special case: if the error is EROFS, and we're not already 289ac27a0ecSDave Kleikamp * inside a transaction, then there's really no point in logging 290ac27a0ecSDave Kleikamp * an error. */ 291ac27a0ecSDave Kleikamp if (errno == -EROFS && journal_current_handle() == NULL && 292ac27a0ecSDave Kleikamp (sb->s_flags & MS_RDONLY)) 293ac27a0ecSDave Kleikamp return; 294ac27a0ecSDave Kleikamp 295617ba13bSMingming Cao errstr = ext4_decode_error(sb, errno, nbuf); 296617ba13bSMingming Cao printk (KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n", 297ac27a0ecSDave Kleikamp sb->s_id, function, errstr); 298ac27a0ecSDave Kleikamp 299617ba13bSMingming Cao ext4_handle_error(sb); 300ac27a0ecSDave Kleikamp } 301ac27a0ecSDave Kleikamp 302ac27a0ecSDave Kleikamp /* 303617ba13bSMingming Cao * ext4_abort is a much stronger failure handler than ext4_error. The 304ac27a0ecSDave Kleikamp * abort function may be used to deal with unrecoverable failures such 305ac27a0ecSDave Kleikamp * as journal IO errors or ENOMEM at a critical moment in log management. 306ac27a0ecSDave Kleikamp * 307ac27a0ecSDave Kleikamp * We unconditionally force the filesystem into an ABORT|READONLY state, 308ac27a0ecSDave Kleikamp * unless the error response on the fs has been set to panic in which 309ac27a0ecSDave Kleikamp * case we take the easy way out and panic immediately. 310ac27a0ecSDave Kleikamp */ 311ac27a0ecSDave Kleikamp 312617ba13bSMingming Cao void ext4_abort (struct super_block * sb, const char * function, 313ac27a0ecSDave Kleikamp const char * fmt, ...) 314ac27a0ecSDave Kleikamp { 315ac27a0ecSDave Kleikamp va_list args; 316ac27a0ecSDave Kleikamp 317617ba13bSMingming Cao printk (KERN_CRIT "ext4_abort called.\n"); 318ac27a0ecSDave Kleikamp 319ac27a0ecSDave Kleikamp va_start(args, fmt); 320617ba13bSMingming Cao printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function); 321ac27a0ecSDave Kleikamp vprintk(fmt, args); 322ac27a0ecSDave Kleikamp printk("\n"); 323ac27a0ecSDave Kleikamp va_end(args); 324ac27a0ecSDave Kleikamp 325ac27a0ecSDave Kleikamp if (test_opt(sb, ERRORS_PANIC)) 326617ba13bSMingming Cao panic("EXT4-fs panic from previous error\n"); 327ac27a0ecSDave Kleikamp 328ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) 329ac27a0ecSDave Kleikamp return; 330ac27a0ecSDave Kleikamp 331ac27a0ecSDave Kleikamp printk(KERN_CRIT "Remounting filesystem read-only\n"); 332617ba13bSMingming Cao EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 333ac27a0ecSDave Kleikamp sb->s_flags |= MS_RDONLY; 334617ba13bSMingming Cao EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; 335dab291afSMingming Cao jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); 336ac27a0ecSDave Kleikamp } 337ac27a0ecSDave Kleikamp 338617ba13bSMingming Cao void ext4_warning (struct super_block * sb, const char * function, 339ac27a0ecSDave Kleikamp const char * fmt, ...) 340ac27a0ecSDave Kleikamp { 341ac27a0ecSDave Kleikamp va_list args; 342ac27a0ecSDave Kleikamp 343ac27a0ecSDave Kleikamp va_start(args, fmt); 344617ba13bSMingming Cao printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ", 345ac27a0ecSDave Kleikamp sb->s_id, function); 346ac27a0ecSDave Kleikamp vprintk(fmt, args); 347ac27a0ecSDave Kleikamp printk("\n"); 348ac27a0ecSDave Kleikamp va_end(args); 349ac27a0ecSDave Kleikamp } 350ac27a0ecSDave Kleikamp 351617ba13bSMingming Cao void ext4_update_dynamic_rev(struct super_block *sb) 352ac27a0ecSDave Kleikamp { 353617ba13bSMingming Cao struct ext4_super_block *es = EXT4_SB(sb)->s_es; 354ac27a0ecSDave Kleikamp 355617ba13bSMingming Cao if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) 356ac27a0ecSDave Kleikamp return; 357ac27a0ecSDave Kleikamp 358617ba13bSMingming Cao ext4_warning(sb, __FUNCTION__, 359ac27a0ecSDave Kleikamp "updating to rev %d because of new feature flag, " 360ac27a0ecSDave Kleikamp "running e2fsck is recommended", 361617ba13bSMingming Cao EXT4_DYNAMIC_REV); 362ac27a0ecSDave Kleikamp 363617ba13bSMingming Cao es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); 364617ba13bSMingming Cao es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); 365617ba13bSMingming Cao es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); 366ac27a0ecSDave Kleikamp /* leave es->s_feature_*compat flags alone */ 367ac27a0ecSDave Kleikamp /* es->s_uuid will be set by e2fsck if empty */ 368ac27a0ecSDave Kleikamp 369ac27a0ecSDave Kleikamp /* 370ac27a0ecSDave Kleikamp * The rest of the superblock fields should be zero, and if not it 371ac27a0ecSDave Kleikamp * means they are likely already in use, so leave them alone. We 372ac27a0ecSDave Kleikamp * can leave it up to e2fsck to clean up any inconsistencies there. 373ac27a0ecSDave Kleikamp */ 374ac27a0ecSDave Kleikamp } 375ac27a0ecSDave Kleikamp 376ac27a0ecSDave Kleikamp /* 377ac27a0ecSDave Kleikamp * Open the external journal device 378ac27a0ecSDave Kleikamp */ 379617ba13bSMingming Cao static struct block_device *ext4_blkdev_get(dev_t dev) 380ac27a0ecSDave Kleikamp { 381ac27a0ecSDave Kleikamp struct block_device *bdev; 382ac27a0ecSDave Kleikamp char b[BDEVNAME_SIZE]; 383ac27a0ecSDave Kleikamp 384ac27a0ecSDave Kleikamp bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); 385ac27a0ecSDave Kleikamp if (IS_ERR(bdev)) 386ac27a0ecSDave Kleikamp goto fail; 387ac27a0ecSDave Kleikamp return bdev; 388ac27a0ecSDave Kleikamp 389ac27a0ecSDave Kleikamp fail: 390617ba13bSMingming Cao printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n", 391ac27a0ecSDave Kleikamp __bdevname(dev, b), PTR_ERR(bdev)); 392ac27a0ecSDave Kleikamp return NULL; 393ac27a0ecSDave Kleikamp } 394ac27a0ecSDave Kleikamp 395ac27a0ecSDave Kleikamp /* 396ac27a0ecSDave Kleikamp * Release the journal device 397ac27a0ecSDave Kleikamp */ 398617ba13bSMingming Cao static int ext4_blkdev_put(struct block_device *bdev) 399ac27a0ecSDave Kleikamp { 400ac27a0ecSDave Kleikamp bd_release(bdev); 401ac27a0ecSDave Kleikamp return blkdev_put(bdev); 402ac27a0ecSDave Kleikamp } 403ac27a0ecSDave Kleikamp 404617ba13bSMingming Cao static int ext4_blkdev_remove(struct ext4_sb_info *sbi) 405ac27a0ecSDave Kleikamp { 406ac27a0ecSDave Kleikamp struct block_device *bdev; 407ac27a0ecSDave Kleikamp int ret = -ENODEV; 408ac27a0ecSDave Kleikamp 409ac27a0ecSDave Kleikamp bdev = sbi->journal_bdev; 410ac27a0ecSDave Kleikamp if (bdev) { 411617ba13bSMingming Cao ret = ext4_blkdev_put(bdev); 412ac27a0ecSDave Kleikamp sbi->journal_bdev = NULL; 413ac27a0ecSDave Kleikamp } 414ac27a0ecSDave Kleikamp return ret; 415ac27a0ecSDave Kleikamp } 416ac27a0ecSDave Kleikamp 417ac27a0ecSDave Kleikamp static inline struct inode *orphan_list_entry(struct list_head *l) 418ac27a0ecSDave Kleikamp { 419617ba13bSMingming Cao return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; 420ac27a0ecSDave Kleikamp } 421ac27a0ecSDave Kleikamp 422617ba13bSMingming Cao static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) 423ac27a0ecSDave Kleikamp { 424ac27a0ecSDave Kleikamp struct list_head *l; 425ac27a0ecSDave Kleikamp 426ac27a0ecSDave Kleikamp printk(KERN_ERR "sb orphan head is %d\n", 427ac27a0ecSDave Kleikamp le32_to_cpu(sbi->s_es->s_last_orphan)); 428ac27a0ecSDave Kleikamp 429ac27a0ecSDave Kleikamp printk(KERN_ERR "sb_info orphan list:\n"); 430ac27a0ecSDave Kleikamp list_for_each(l, &sbi->s_orphan) { 431ac27a0ecSDave Kleikamp struct inode *inode = orphan_list_entry(l); 432ac27a0ecSDave Kleikamp printk(KERN_ERR " " 433ac27a0ecSDave Kleikamp "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", 434ac27a0ecSDave Kleikamp inode->i_sb->s_id, inode->i_ino, inode, 435ac27a0ecSDave Kleikamp inode->i_mode, inode->i_nlink, 436ac27a0ecSDave Kleikamp NEXT_ORPHAN(inode)); 437ac27a0ecSDave Kleikamp } 438ac27a0ecSDave Kleikamp } 439ac27a0ecSDave Kleikamp 440617ba13bSMingming Cao static void ext4_put_super (struct super_block * sb) 441ac27a0ecSDave Kleikamp { 442617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 443617ba13bSMingming Cao struct ext4_super_block *es = sbi->s_es; 444ac27a0ecSDave Kleikamp int i; 445ac27a0ecSDave Kleikamp 446a86c6181SAlex Tomas ext4_ext_release(sb); 447617ba13bSMingming Cao ext4_xattr_put_super(sb); 448dab291afSMingming Cao jbd2_journal_destroy(sbi->s_journal); 449ac27a0ecSDave Kleikamp if (!(sb->s_flags & MS_RDONLY)) { 450617ba13bSMingming Cao EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 451ac27a0ecSDave Kleikamp es->s_state = cpu_to_le16(sbi->s_mount_state); 452ac27a0ecSDave Kleikamp BUFFER_TRACE(sbi->s_sbh, "marking dirty"); 453ac27a0ecSDave Kleikamp mark_buffer_dirty(sbi->s_sbh); 454617ba13bSMingming Cao ext4_commit_super(sb, es, 1); 455ac27a0ecSDave Kleikamp } 456ac27a0ecSDave Kleikamp 457ac27a0ecSDave Kleikamp for (i = 0; i < sbi->s_gdb_count; i++) 458ac27a0ecSDave Kleikamp brelse(sbi->s_group_desc[i]); 459ac27a0ecSDave Kleikamp kfree(sbi->s_group_desc); 460ac27a0ecSDave Kleikamp percpu_counter_destroy(&sbi->s_freeblocks_counter); 461ac27a0ecSDave Kleikamp percpu_counter_destroy(&sbi->s_freeinodes_counter); 462ac27a0ecSDave Kleikamp percpu_counter_destroy(&sbi->s_dirs_counter); 463ac27a0ecSDave Kleikamp brelse(sbi->s_sbh); 464ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 465ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) 466ac27a0ecSDave Kleikamp kfree(sbi->s_qf_names[i]); 467ac27a0ecSDave Kleikamp #endif 468ac27a0ecSDave Kleikamp 469ac27a0ecSDave Kleikamp /* Debugging code just in case the in-memory inode orphan list 470ac27a0ecSDave Kleikamp * isn't empty. The on-disk one can be non-empty if we've 471ac27a0ecSDave Kleikamp * detected an error and taken the fs readonly, but the 472ac27a0ecSDave Kleikamp * in-memory list had better be clean by this point. */ 473ac27a0ecSDave Kleikamp if (!list_empty(&sbi->s_orphan)) 474ac27a0ecSDave Kleikamp dump_orphan_list(sb, sbi); 475ac27a0ecSDave Kleikamp J_ASSERT(list_empty(&sbi->s_orphan)); 476ac27a0ecSDave Kleikamp 477f98393a6SPeter Zijlstra invalidate_bdev(sb->s_bdev); 478ac27a0ecSDave Kleikamp if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { 479ac27a0ecSDave Kleikamp /* 480ac27a0ecSDave Kleikamp * Invalidate the journal device's buffers. We don't want them 481ac27a0ecSDave Kleikamp * floating about in memory - the physical journal device may 482ac27a0ecSDave Kleikamp * hotswapped, and it breaks the `ro-after' testing code. 483ac27a0ecSDave Kleikamp */ 484ac27a0ecSDave Kleikamp sync_blockdev(sbi->journal_bdev); 485f98393a6SPeter Zijlstra invalidate_bdev(sbi->journal_bdev); 486617ba13bSMingming Cao ext4_blkdev_remove(sbi); 487ac27a0ecSDave Kleikamp } 488ac27a0ecSDave Kleikamp sb->s_fs_info = NULL; 489ac27a0ecSDave Kleikamp kfree(sbi); 490ac27a0ecSDave Kleikamp return; 491ac27a0ecSDave Kleikamp } 492ac27a0ecSDave Kleikamp 493e18b890bSChristoph Lameter static struct kmem_cache *ext4_inode_cachep; 494ac27a0ecSDave Kleikamp 495ac27a0ecSDave Kleikamp /* 496ac27a0ecSDave Kleikamp * Called inside transaction, so use GFP_NOFS 497ac27a0ecSDave Kleikamp */ 498617ba13bSMingming Cao static struct inode *ext4_alloc_inode(struct super_block *sb) 499ac27a0ecSDave Kleikamp { 500617ba13bSMingming Cao struct ext4_inode_info *ei; 501ac27a0ecSDave Kleikamp 502e6b4f8daSChristoph Lameter ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); 503ac27a0ecSDave Kleikamp if (!ei) 504ac27a0ecSDave Kleikamp return NULL; 505617ba13bSMingming Cao #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 506617ba13bSMingming Cao ei->i_acl = EXT4_ACL_NOT_CACHED; 507617ba13bSMingming Cao ei->i_default_acl = EXT4_ACL_NOT_CACHED; 508ac27a0ecSDave Kleikamp #endif 509ac27a0ecSDave Kleikamp ei->i_block_alloc_info = NULL; 510ac27a0ecSDave Kleikamp ei->vfs_inode.i_version = 1; 511a86c6181SAlex Tomas memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); 512ac27a0ecSDave Kleikamp return &ei->vfs_inode; 513ac27a0ecSDave Kleikamp } 514ac27a0ecSDave Kleikamp 515617ba13bSMingming Cao static void ext4_destroy_inode(struct inode *inode) 516ac27a0ecSDave Kleikamp { 5179f7dd93dSVasily Averin if (!list_empty(&(EXT4_I(inode)->i_orphan))) { 5189f7dd93dSVasily Averin printk("EXT4 Inode %p: orphan list check failed!\n", 5199f7dd93dSVasily Averin EXT4_I(inode)); 5209f7dd93dSVasily Averin print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, 5219f7dd93dSVasily Averin EXT4_I(inode), sizeof(struct ext4_inode_info), 5229f7dd93dSVasily Averin true); 5239f7dd93dSVasily Averin dump_stack(); 5249f7dd93dSVasily Averin } 525617ba13bSMingming Cao kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); 526ac27a0ecSDave Kleikamp } 527ac27a0ecSDave Kleikamp 5284ba9b9d0SChristoph Lameter static void init_once(struct kmem_cache *cachep, void *foo) 529ac27a0ecSDave Kleikamp { 530617ba13bSMingming Cao struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; 531ac27a0ecSDave Kleikamp 532ac27a0ecSDave Kleikamp INIT_LIST_HEAD(&ei->i_orphan); 533617ba13bSMingming Cao #ifdef CONFIG_EXT4DEV_FS_XATTR 534ac27a0ecSDave Kleikamp init_rwsem(&ei->xattr_sem); 535ac27a0ecSDave Kleikamp #endif 536ac27a0ecSDave Kleikamp mutex_init(&ei->truncate_mutex); 537ac27a0ecSDave Kleikamp inode_init_once(&ei->vfs_inode); 538ac27a0ecSDave Kleikamp } 539ac27a0ecSDave Kleikamp 540ac27a0ecSDave Kleikamp static int init_inodecache(void) 541ac27a0ecSDave Kleikamp { 542617ba13bSMingming Cao ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", 543617ba13bSMingming Cao sizeof(struct ext4_inode_info), 544ac27a0ecSDave Kleikamp 0, (SLAB_RECLAIM_ACCOUNT| 545ac27a0ecSDave Kleikamp SLAB_MEM_SPREAD), 54620c2df83SPaul Mundt init_once); 547617ba13bSMingming Cao if (ext4_inode_cachep == NULL) 548ac27a0ecSDave Kleikamp return -ENOMEM; 549ac27a0ecSDave Kleikamp return 0; 550ac27a0ecSDave Kleikamp } 551ac27a0ecSDave Kleikamp 552ac27a0ecSDave Kleikamp static void destroy_inodecache(void) 553ac27a0ecSDave Kleikamp { 554617ba13bSMingming Cao kmem_cache_destroy(ext4_inode_cachep); 555ac27a0ecSDave Kleikamp } 556ac27a0ecSDave Kleikamp 557617ba13bSMingming Cao static void ext4_clear_inode(struct inode *inode) 558ac27a0ecSDave Kleikamp { 559617ba13bSMingming Cao struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info; 560617ba13bSMingming Cao #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 561617ba13bSMingming Cao if (EXT4_I(inode)->i_acl && 562617ba13bSMingming Cao EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) { 563617ba13bSMingming Cao posix_acl_release(EXT4_I(inode)->i_acl); 564617ba13bSMingming Cao EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED; 565ac27a0ecSDave Kleikamp } 566617ba13bSMingming Cao if (EXT4_I(inode)->i_default_acl && 567617ba13bSMingming Cao EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) { 568617ba13bSMingming Cao posix_acl_release(EXT4_I(inode)->i_default_acl); 569617ba13bSMingming Cao EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED; 570ac27a0ecSDave Kleikamp } 571ac27a0ecSDave Kleikamp #endif 572617ba13bSMingming Cao ext4_discard_reservation(inode); 573617ba13bSMingming Cao EXT4_I(inode)->i_block_alloc_info = NULL; 574ac27a0ecSDave Kleikamp if (unlikely(rsv)) 575ac27a0ecSDave Kleikamp kfree(rsv); 576ac27a0ecSDave Kleikamp } 577ac27a0ecSDave Kleikamp 578617ba13bSMingming Cao static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb) 579ac27a0ecSDave Kleikamp { 580ac27a0ecSDave Kleikamp #if defined(CONFIG_QUOTA) 581617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 582ac27a0ecSDave Kleikamp 583ac27a0ecSDave Kleikamp if (sbi->s_jquota_fmt) 584ac27a0ecSDave Kleikamp seq_printf(seq, ",jqfmt=%s", 585ac27a0ecSDave Kleikamp (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0"); 586ac27a0ecSDave Kleikamp 587ac27a0ecSDave Kleikamp if (sbi->s_qf_names[USRQUOTA]) 588ac27a0ecSDave Kleikamp seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); 589ac27a0ecSDave Kleikamp 590ac27a0ecSDave Kleikamp if (sbi->s_qf_names[GRPQUOTA]) 591ac27a0ecSDave Kleikamp seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); 592ac27a0ecSDave Kleikamp 593617ba13bSMingming Cao if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) 594ac27a0ecSDave Kleikamp seq_puts(seq, ",usrquota"); 595ac27a0ecSDave Kleikamp 596617ba13bSMingming Cao if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) 597ac27a0ecSDave Kleikamp seq_puts(seq, ",grpquota"); 598ac27a0ecSDave Kleikamp #endif 599ac27a0ecSDave Kleikamp } 600ac27a0ecSDave Kleikamp 601d9c9bef1SMiklos Szeredi /* 602d9c9bef1SMiklos Szeredi * Show an option if 603d9c9bef1SMiklos Szeredi * - it's set to a non-default value OR 604d9c9bef1SMiklos Szeredi * - if the per-sb default is different from the global default 605d9c9bef1SMiklos Szeredi */ 606617ba13bSMingming Cao static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs) 607ac27a0ecSDave Kleikamp { 608ac27a0ecSDave Kleikamp struct super_block *sb = vfs->mnt_sb; 609d9c9bef1SMiklos Szeredi struct ext4_sb_info *sbi = EXT4_SB(sb); 610d9c9bef1SMiklos Szeredi struct ext4_super_block *es = sbi->s_es; 611d9c9bef1SMiklos Szeredi unsigned long def_mount_opts; 612d9c9bef1SMiklos Szeredi 613d9c9bef1SMiklos Szeredi def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 614d9c9bef1SMiklos Szeredi 615d9c9bef1SMiklos Szeredi if (sbi->s_sb_block != 1) 616d9c9bef1SMiklos Szeredi seq_printf(seq, ",sb=%llu", sbi->s_sb_block); 617d9c9bef1SMiklos Szeredi if (test_opt(sb, MINIX_DF)) 618d9c9bef1SMiklos Szeredi seq_puts(seq, ",minixdf"); 619d9c9bef1SMiklos Szeredi if (test_opt(sb, GRPID)) 620d9c9bef1SMiklos Szeredi seq_puts(seq, ",grpid"); 621d9c9bef1SMiklos Szeredi if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS)) 622d9c9bef1SMiklos Szeredi seq_puts(seq, ",nogrpid"); 623d9c9bef1SMiklos Szeredi if (sbi->s_resuid != EXT4_DEF_RESUID || 624d9c9bef1SMiklos Szeredi le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) { 625d9c9bef1SMiklos Szeredi seq_printf(seq, ",resuid=%u", sbi->s_resuid); 626d9c9bef1SMiklos Szeredi } 627d9c9bef1SMiklos Szeredi if (sbi->s_resgid != EXT4_DEF_RESGID || 628d9c9bef1SMiklos Szeredi le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) { 629d9c9bef1SMiklos Szeredi seq_printf(seq, ",resgid=%u", sbi->s_resgid); 630d9c9bef1SMiklos Szeredi } 631d9c9bef1SMiklos Szeredi if (test_opt(sb, ERRORS_CONT)) { 632d9c9bef1SMiklos Szeredi int def_errors = le16_to_cpu(es->s_errors); 633d9c9bef1SMiklos Szeredi 634d9c9bef1SMiklos Szeredi if (def_errors == EXT4_ERRORS_PANIC || 635d9c9bef1SMiklos Szeredi def_errors == EXT4_ERRORS_RO) { 636d9c9bef1SMiklos Szeredi seq_puts(seq, ",errors=continue"); 637d9c9bef1SMiklos Szeredi } 638d9c9bef1SMiklos Szeredi } 639d9c9bef1SMiklos Szeredi if (test_opt(sb, ERRORS_RO)) 640d9c9bef1SMiklos Szeredi seq_puts(seq, ",errors=remount-ro"); 641d9c9bef1SMiklos Szeredi if (test_opt(sb, ERRORS_PANIC)) 642d9c9bef1SMiklos Szeredi seq_puts(seq, ",errors=panic"); 643d9c9bef1SMiklos Szeredi if (test_opt(sb, NO_UID32)) 644d9c9bef1SMiklos Szeredi seq_puts(seq, ",nouid32"); 645d9c9bef1SMiklos Szeredi if (test_opt(sb, DEBUG)) 646d9c9bef1SMiklos Szeredi seq_puts(seq, ",debug"); 647d9c9bef1SMiklos Szeredi if (test_opt(sb, OLDALLOC)) 648d9c9bef1SMiklos Szeredi seq_puts(seq, ",oldalloc"); 649d9c9bef1SMiklos Szeredi #ifdef CONFIG_EXT4_FS_XATTR 650d9c9bef1SMiklos Szeredi if (test_opt(sb, XATTR_USER)) 651d9c9bef1SMiklos Szeredi seq_puts(seq, ",user_xattr"); 652d9c9bef1SMiklos Szeredi if (!test_opt(sb, XATTR_USER) && 653d9c9bef1SMiklos Szeredi (def_mount_opts & EXT4_DEFM_XATTR_USER)) { 654d9c9bef1SMiklos Szeredi seq_puts(seq, ",nouser_xattr"); 655d9c9bef1SMiklos Szeredi } 656d9c9bef1SMiklos Szeredi #endif 657d9c9bef1SMiklos Szeredi #ifdef CONFIG_EXT4_FS_POSIX_ACL 658d9c9bef1SMiklos Szeredi if (test_opt(sb, POSIX_ACL)) 659d9c9bef1SMiklos Szeredi seq_puts(seq, ",acl"); 660d9c9bef1SMiklos Szeredi if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL)) 661d9c9bef1SMiklos Szeredi seq_puts(seq, ",noacl"); 662d9c9bef1SMiklos Szeredi #endif 663d9c9bef1SMiklos Szeredi if (!test_opt(sb, RESERVATION)) 664d9c9bef1SMiklos Szeredi seq_puts(seq, ",noreservation"); 665d9c9bef1SMiklos Szeredi if (sbi->s_commit_interval) { 666d9c9bef1SMiklos Szeredi seq_printf(seq, ",commit=%u", 667d9c9bef1SMiklos Szeredi (unsigned) (sbi->s_commit_interval / HZ)); 668d9c9bef1SMiklos Szeredi } 669d9c9bef1SMiklos Szeredi if (test_opt(sb, BARRIER)) 670d9c9bef1SMiklos Szeredi seq_puts(seq, ",barrier=1"); 671d9c9bef1SMiklos Szeredi if (test_opt(sb, NOBH)) 672d9c9bef1SMiklos Szeredi seq_puts(seq, ",nobh"); 673d9c9bef1SMiklos Szeredi if (!test_opt(sb, EXTENTS)) 674d9c9bef1SMiklos Szeredi seq_puts(seq, ",noextents"); 675ac27a0ecSDave Kleikamp 676617ba13bSMingming Cao if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 677ac27a0ecSDave Kleikamp seq_puts(seq, ",data=journal"); 678617ba13bSMingming Cao else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 679ac27a0ecSDave Kleikamp seq_puts(seq, ",data=ordered"); 680617ba13bSMingming Cao else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) 681ac27a0ecSDave Kleikamp seq_puts(seq, ",data=writeback"); 682ac27a0ecSDave Kleikamp 683617ba13bSMingming Cao ext4_show_quota_options(seq, sb); 684ac27a0ecSDave Kleikamp 685ac27a0ecSDave Kleikamp return 0; 686ac27a0ecSDave Kleikamp } 687ac27a0ecSDave Kleikamp 688ac27a0ecSDave Kleikamp 689*1b961ac0SChristoph Hellwig static struct inode *ext4_nfs_get_inode(struct super_block *sb, 690*1b961ac0SChristoph Hellwig u64 ino, u32 generation) 691ac27a0ecSDave Kleikamp { 692ac27a0ecSDave Kleikamp struct inode *inode; 693ac27a0ecSDave Kleikamp 694617ba13bSMingming Cao if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) 695ac27a0ecSDave Kleikamp return ERR_PTR(-ESTALE); 696617ba13bSMingming Cao if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) 697ac27a0ecSDave Kleikamp return ERR_PTR(-ESTALE); 698ac27a0ecSDave Kleikamp 699ac27a0ecSDave Kleikamp /* iget isn't really right if the inode is currently unallocated!! 700ac27a0ecSDave Kleikamp * 701617ba13bSMingming Cao * ext4_read_inode will return a bad_inode if the inode had been 702ac27a0ecSDave Kleikamp * deleted, so we should be safe. 703ac27a0ecSDave Kleikamp * 704ac27a0ecSDave Kleikamp * Currently we don't know the generation for parent directory, so 705ac27a0ecSDave Kleikamp * a generation of 0 means "accept any" 706ac27a0ecSDave Kleikamp */ 707ac27a0ecSDave Kleikamp inode = iget(sb, ino); 708ac27a0ecSDave Kleikamp if (inode == NULL) 709ac27a0ecSDave Kleikamp return ERR_PTR(-ENOMEM); 710ac27a0ecSDave Kleikamp if (is_bad_inode(inode) || 711ac27a0ecSDave Kleikamp (generation && inode->i_generation != generation)) { 712ac27a0ecSDave Kleikamp iput(inode); 713ac27a0ecSDave Kleikamp return ERR_PTR(-ESTALE); 714ac27a0ecSDave Kleikamp } 715*1b961ac0SChristoph Hellwig 716*1b961ac0SChristoph Hellwig return inode; 717ac27a0ecSDave Kleikamp } 718*1b961ac0SChristoph Hellwig 719*1b961ac0SChristoph Hellwig static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, 720*1b961ac0SChristoph Hellwig int fh_len, int fh_type) 721*1b961ac0SChristoph Hellwig { 722*1b961ac0SChristoph Hellwig return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 723*1b961ac0SChristoph Hellwig ext4_nfs_get_inode); 724*1b961ac0SChristoph Hellwig } 725*1b961ac0SChristoph Hellwig 726*1b961ac0SChristoph Hellwig static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, 727*1b961ac0SChristoph Hellwig int fh_len, int fh_type) 728*1b961ac0SChristoph Hellwig { 729*1b961ac0SChristoph Hellwig return generic_fh_to_parent(sb, fid, fh_len, fh_type, 730*1b961ac0SChristoph Hellwig ext4_nfs_get_inode); 731ac27a0ecSDave Kleikamp } 732ac27a0ecSDave Kleikamp 733ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 734ac27a0ecSDave Kleikamp #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group") 735ac27a0ecSDave Kleikamp #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) 736ac27a0ecSDave Kleikamp 737617ba13bSMingming Cao static int ext4_dquot_initialize(struct inode *inode, int type); 738617ba13bSMingming Cao static int ext4_dquot_drop(struct inode *inode); 739617ba13bSMingming Cao static int ext4_write_dquot(struct dquot *dquot); 740617ba13bSMingming Cao static int ext4_acquire_dquot(struct dquot *dquot); 741617ba13bSMingming Cao static int ext4_release_dquot(struct dquot *dquot); 742617ba13bSMingming Cao static int ext4_mark_dquot_dirty(struct dquot *dquot); 743617ba13bSMingming Cao static int ext4_write_info(struct super_block *sb, int type); 744617ba13bSMingming Cao static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path); 745617ba13bSMingming Cao static int ext4_quota_on_mount(struct super_block *sb, int type); 746617ba13bSMingming Cao static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 747ac27a0ecSDave Kleikamp size_t len, loff_t off); 748617ba13bSMingming Cao static ssize_t ext4_quota_write(struct super_block *sb, int type, 749ac27a0ecSDave Kleikamp const char *data, size_t len, loff_t off); 750ac27a0ecSDave Kleikamp 751617ba13bSMingming Cao static struct dquot_operations ext4_quota_operations = { 752617ba13bSMingming Cao .initialize = ext4_dquot_initialize, 753617ba13bSMingming Cao .drop = ext4_dquot_drop, 754ac27a0ecSDave Kleikamp .alloc_space = dquot_alloc_space, 755ac27a0ecSDave Kleikamp .alloc_inode = dquot_alloc_inode, 756ac27a0ecSDave Kleikamp .free_space = dquot_free_space, 757ac27a0ecSDave Kleikamp .free_inode = dquot_free_inode, 758ac27a0ecSDave Kleikamp .transfer = dquot_transfer, 759617ba13bSMingming Cao .write_dquot = ext4_write_dquot, 760617ba13bSMingming Cao .acquire_dquot = ext4_acquire_dquot, 761617ba13bSMingming Cao .release_dquot = ext4_release_dquot, 762617ba13bSMingming Cao .mark_dirty = ext4_mark_dquot_dirty, 763617ba13bSMingming Cao .write_info = ext4_write_info 764ac27a0ecSDave Kleikamp }; 765ac27a0ecSDave Kleikamp 766617ba13bSMingming Cao static struct quotactl_ops ext4_qctl_operations = { 767617ba13bSMingming Cao .quota_on = ext4_quota_on, 768ac27a0ecSDave Kleikamp .quota_off = vfs_quota_off, 769ac27a0ecSDave Kleikamp .quota_sync = vfs_quota_sync, 770ac27a0ecSDave Kleikamp .get_info = vfs_get_dqinfo, 771ac27a0ecSDave Kleikamp .set_info = vfs_set_dqinfo, 772ac27a0ecSDave Kleikamp .get_dqblk = vfs_get_dqblk, 773ac27a0ecSDave Kleikamp .set_dqblk = vfs_set_dqblk 774ac27a0ecSDave Kleikamp }; 775ac27a0ecSDave Kleikamp #endif 776ac27a0ecSDave Kleikamp 777ee9b6d61SJosef 'Jeff' Sipek static const struct super_operations ext4_sops = { 778617ba13bSMingming Cao .alloc_inode = ext4_alloc_inode, 779617ba13bSMingming Cao .destroy_inode = ext4_destroy_inode, 780617ba13bSMingming Cao .read_inode = ext4_read_inode, 781617ba13bSMingming Cao .write_inode = ext4_write_inode, 782617ba13bSMingming Cao .dirty_inode = ext4_dirty_inode, 783617ba13bSMingming Cao .delete_inode = ext4_delete_inode, 784617ba13bSMingming Cao .put_super = ext4_put_super, 785617ba13bSMingming Cao .write_super = ext4_write_super, 786617ba13bSMingming Cao .sync_fs = ext4_sync_fs, 787617ba13bSMingming Cao .write_super_lockfs = ext4_write_super_lockfs, 788617ba13bSMingming Cao .unlockfs = ext4_unlockfs, 789617ba13bSMingming Cao .statfs = ext4_statfs, 790617ba13bSMingming Cao .remount_fs = ext4_remount, 791617ba13bSMingming Cao .clear_inode = ext4_clear_inode, 792617ba13bSMingming Cao .show_options = ext4_show_options, 793ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 794617ba13bSMingming Cao .quota_read = ext4_quota_read, 795617ba13bSMingming Cao .quota_write = ext4_quota_write, 796ac27a0ecSDave Kleikamp #endif 797ac27a0ecSDave Kleikamp }; 798ac27a0ecSDave Kleikamp 799617ba13bSMingming Cao static struct export_operations ext4_export_ops = { 800*1b961ac0SChristoph Hellwig .fh_to_dentry = ext4_fh_to_dentry, 801*1b961ac0SChristoph Hellwig .fh_to_parent = ext4_fh_to_parent, 802617ba13bSMingming Cao .get_parent = ext4_get_parent, 803ac27a0ecSDave Kleikamp }; 804ac27a0ecSDave Kleikamp 805ac27a0ecSDave Kleikamp enum { 806ac27a0ecSDave Kleikamp Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 807ac27a0ecSDave Kleikamp Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, 808ac27a0ecSDave Kleikamp Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov, 809ac27a0ecSDave Kleikamp Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, 810ac27a0ecSDave Kleikamp Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh, 811ac27a0ecSDave Kleikamp Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev, 812ac27a0ecSDave Kleikamp Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, 813ac27a0ecSDave Kleikamp Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, 814ac27a0ecSDave Kleikamp Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota, 815ac27a0ecSDave Kleikamp Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota, 8161e2462f9SMingming Cao Opt_grpquota, Opt_extents, Opt_noextents, 817ac27a0ecSDave Kleikamp }; 818ac27a0ecSDave Kleikamp 819ac27a0ecSDave Kleikamp static match_table_t tokens = { 820ac27a0ecSDave Kleikamp {Opt_bsd_df, "bsddf"}, 821ac27a0ecSDave Kleikamp {Opt_minix_df, "minixdf"}, 822ac27a0ecSDave Kleikamp {Opt_grpid, "grpid"}, 823ac27a0ecSDave Kleikamp {Opt_grpid, "bsdgroups"}, 824ac27a0ecSDave Kleikamp {Opt_nogrpid, "nogrpid"}, 825ac27a0ecSDave Kleikamp {Opt_nogrpid, "sysvgroups"}, 826ac27a0ecSDave Kleikamp {Opt_resgid, "resgid=%u"}, 827ac27a0ecSDave Kleikamp {Opt_resuid, "resuid=%u"}, 828ac27a0ecSDave Kleikamp {Opt_sb, "sb=%u"}, 829ac27a0ecSDave Kleikamp {Opt_err_cont, "errors=continue"}, 830ac27a0ecSDave Kleikamp {Opt_err_panic, "errors=panic"}, 831ac27a0ecSDave Kleikamp {Opt_err_ro, "errors=remount-ro"}, 832ac27a0ecSDave Kleikamp {Opt_nouid32, "nouid32"}, 833ac27a0ecSDave Kleikamp {Opt_nocheck, "nocheck"}, 834ac27a0ecSDave Kleikamp {Opt_nocheck, "check=none"}, 835ac27a0ecSDave Kleikamp {Opt_debug, "debug"}, 836ac27a0ecSDave Kleikamp {Opt_oldalloc, "oldalloc"}, 837ac27a0ecSDave Kleikamp {Opt_orlov, "orlov"}, 838ac27a0ecSDave Kleikamp {Opt_user_xattr, "user_xattr"}, 839ac27a0ecSDave Kleikamp {Opt_nouser_xattr, "nouser_xattr"}, 840ac27a0ecSDave Kleikamp {Opt_acl, "acl"}, 841ac27a0ecSDave Kleikamp {Opt_noacl, "noacl"}, 842ac27a0ecSDave Kleikamp {Opt_reservation, "reservation"}, 843ac27a0ecSDave Kleikamp {Opt_noreservation, "noreservation"}, 844ac27a0ecSDave Kleikamp {Opt_noload, "noload"}, 845ac27a0ecSDave Kleikamp {Opt_nobh, "nobh"}, 846ac27a0ecSDave Kleikamp {Opt_bh, "bh"}, 847ac27a0ecSDave Kleikamp {Opt_commit, "commit=%u"}, 848ac27a0ecSDave Kleikamp {Opt_journal_update, "journal=update"}, 849ac27a0ecSDave Kleikamp {Opt_journal_inum, "journal=%u"}, 850ac27a0ecSDave Kleikamp {Opt_journal_dev, "journal_dev=%u"}, 851ac27a0ecSDave Kleikamp {Opt_abort, "abort"}, 852ac27a0ecSDave Kleikamp {Opt_data_journal, "data=journal"}, 853ac27a0ecSDave Kleikamp {Opt_data_ordered, "data=ordered"}, 854ac27a0ecSDave Kleikamp {Opt_data_writeback, "data=writeback"}, 855ac27a0ecSDave Kleikamp {Opt_offusrjquota, "usrjquota="}, 856ac27a0ecSDave Kleikamp {Opt_usrjquota, "usrjquota=%s"}, 857ac27a0ecSDave Kleikamp {Opt_offgrpjquota, "grpjquota="}, 858ac27a0ecSDave Kleikamp {Opt_grpjquota, "grpjquota=%s"}, 859ac27a0ecSDave Kleikamp {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, 860ac27a0ecSDave Kleikamp {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, 861ac27a0ecSDave Kleikamp {Opt_grpquota, "grpquota"}, 862ac27a0ecSDave Kleikamp {Opt_noquota, "noquota"}, 863ac27a0ecSDave Kleikamp {Opt_quota, "quota"}, 864ac27a0ecSDave Kleikamp {Opt_usrquota, "usrquota"}, 865ac27a0ecSDave Kleikamp {Opt_barrier, "barrier=%u"}, 866a86c6181SAlex Tomas {Opt_extents, "extents"}, 8671e2462f9SMingming Cao {Opt_noextents, "noextents"}, 868ac27a0ecSDave Kleikamp {Opt_err, NULL}, 869ac27a0ecSDave Kleikamp {Opt_resize, "resize"}, 870ac27a0ecSDave Kleikamp }; 871ac27a0ecSDave Kleikamp 872617ba13bSMingming Cao static ext4_fsblk_t get_sb_block(void **data) 873ac27a0ecSDave Kleikamp { 874617ba13bSMingming Cao ext4_fsblk_t sb_block; 875ac27a0ecSDave Kleikamp char *options = (char *) *data; 876ac27a0ecSDave Kleikamp 877ac27a0ecSDave Kleikamp if (!options || strncmp(options, "sb=", 3) != 0) 878ac27a0ecSDave Kleikamp return 1; /* Default location */ 879ac27a0ecSDave Kleikamp options += 3; 880617ba13bSMingming Cao /*todo: use simple_strtoll with >32bit ext4 */ 881ac27a0ecSDave Kleikamp sb_block = simple_strtoul(options, &options, 0); 882ac27a0ecSDave Kleikamp if (*options && *options != ',') { 883617ba13bSMingming Cao printk("EXT4-fs: Invalid sb specification: %s\n", 884ac27a0ecSDave Kleikamp (char *) *data); 885ac27a0ecSDave Kleikamp return 1; 886ac27a0ecSDave Kleikamp } 887ac27a0ecSDave Kleikamp if (*options == ',') 888ac27a0ecSDave Kleikamp options++; 889ac27a0ecSDave Kleikamp *data = (void *) options; 890ac27a0ecSDave Kleikamp return sb_block; 891ac27a0ecSDave Kleikamp } 892ac27a0ecSDave Kleikamp 893ac27a0ecSDave Kleikamp static int parse_options (char *options, struct super_block *sb, 894ac27a0ecSDave Kleikamp unsigned int *inum, unsigned long *journal_devnum, 895617ba13bSMingming Cao ext4_fsblk_t *n_blocks_count, int is_remount) 896ac27a0ecSDave Kleikamp { 897617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 898ac27a0ecSDave Kleikamp char * p; 899ac27a0ecSDave Kleikamp substring_t args[MAX_OPT_ARGS]; 900ac27a0ecSDave Kleikamp int data_opt = 0; 901ac27a0ecSDave Kleikamp int option; 902ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 903ac27a0ecSDave Kleikamp int qtype; 904ac27a0ecSDave Kleikamp char *qname; 905ac27a0ecSDave Kleikamp #endif 906ac27a0ecSDave Kleikamp 907ac27a0ecSDave Kleikamp if (!options) 908ac27a0ecSDave Kleikamp return 1; 909ac27a0ecSDave Kleikamp 910ac27a0ecSDave Kleikamp while ((p = strsep (&options, ",")) != NULL) { 911ac27a0ecSDave Kleikamp int token; 912ac27a0ecSDave Kleikamp if (!*p) 913ac27a0ecSDave Kleikamp continue; 914ac27a0ecSDave Kleikamp 915ac27a0ecSDave Kleikamp token = match_token(p, tokens, args); 916ac27a0ecSDave Kleikamp switch (token) { 917ac27a0ecSDave Kleikamp case Opt_bsd_df: 918ac27a0ecSDave Kleikamp clear_opt (sbi->s_mount_opt, MINIX_DF); 919ac27a0ecSDave Kleikamp break; 920ac27a0ecSDave Kleikamp case Opt_minix_df: 921ac27a0ecSDave Kleikamp set_opt (sbi->s_mount_opt, MINIX_DF); 922ac27a0ecSDave Kleikamp break; 923ac27a0ecSDave Kleikamp case Opt_grpid: 924ac27a0ecSDave Kleikamp set_opt (sbi->s_mount_opt, GRPID); 925ac27a0ecSDave Kleikamp break; 926ac27a0ecSDave Kleikamp case Opt_nogrpid: 927ac27a0ecSDave Kleikamp clear_opt (sbi->s_mount_opt, GRPID); 928ac27a0ecSDave Kleikamp break; 929ac27a0ecSDave Kleikamp case Opt_resuid: 930ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 931ac27a0ecSDave Kleikamp return 0; 932ac27a0ecSDave Kleikamp sbi->s_resuid = option; 933ac27a0ecSDave Kleikamp break; 934ac27a0ecSDave Kleikamp case Opt_resgid: 935ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 936ac27a0ecSDave Kleikamp return 0; 937ac27a0ecSDave Kleikamp sbi->s_resgid = option; 938ac27a0ecSDave Kleikamp break; 939ac27a0ecSDave Kleikamp case Opt_sb: 940ac27a0ecSDave Kleikamp /* handled by get_sb_block() instead of here */ 941ac27a0ecSDave Kleikamp /* *sb_block = match_int(&args[0]); */ 942ac27a0ecSDave Kleikamp break; 943ac27a0ecSDave Kleikamp case Opt_err_panic: 944ac27a0ecSDave Kleikamp clear_opt (sbi->s_mount_opt, ERRORS_CONT); 945ac27a0ecSDave Kleikamp clear_opt (sbi->s_mount_opt, ERRORS_RO); 946ac27a0ecSDave Kleikamp set_opt (sbi->s_mount_opt, ERRORS_PANIC); 947ac27a0ecSDave Kleikamp break; 948ac27a0ecSDave Kleikamp case Opt_err_ro: 949ac27a0ecSDave Kleikamp clear_opt (sbi->s_mount_opt, ERRORS_CONT); 950ac27a0ecSDave Kleikamp clear_opt (sbi->s_mount_opt, ERRORS_PANIC); 951ac27a0ecSDave Kleikamp set_opt (sbi->s_mount_opt, ERRORS_RO); 952ac27a0ecSDave Kleikamp break; 953ac27a0ecSDave Kleikamp case Opt_err_cont: 954ac27a0ecSDave Kleikamp clear_opt (sbi->s_mount_opt, ERRORS_RO); 955ac27a0ecSDave Kleikamp clear_opt (sbi->s_mount_opt, ERRORS_PANIC); 956ac27a0ecSDave Kleikamp set_opt (sbi->s_mount_opt, ERRORS_CONT); 957ac27a0ecSDave Kleikamp break; 958ac27a0ecSDave Kleikamp case Opt_nouid32: 959ac27a0ecSDave Kleikamp set_opt (sbi->s_mount_opt, NO_UID32); 960ac27a0ecSDave Kleikamp break; 961ac27a0ecSDave Kleikamp case Opt_nocheck: 962ac27a0ecSDave Kleikamp clear_opt (sbi->s_mount_opt, CHECK); 963ac27a0ecSDave Kleikamp break; 964ac27a0ecSDave Kleikamp case Opt_debug: 965ac27a0ecSDave Kleikamp set_opt (sbi->s_mount_opt, DEBUG); 966ac27a0ecSDave Kleikamp break; 967ac27a0ecSDave Kleikamp case Opt_oldalloc: 968ac27a0ecSDave Kleikamp set_opt (sbi->s_mount_opt, OLDALLOC); 969ac27a0ecSDave Kleikamp break; 970ac27a0ecSDave Kleikamp case Opt_orlov: 971ac27a0ecSDave Kleikamp clear_opt (sbi->s_mount_opt, OLDALLOC); 972ac27a0ecSDave Kleikamp break; 973617ba13bSMingming Cao #ifdef CONFIG_EXT4DEV_FS_XATTR 974ac27a0ecSDave Kleikamp case Opt_user_xattr: 975ac27a0ecSDave Kleikamp set_opt (sbi->s_mount_opt, XATTR_USER); 976ac27a0ecSDave Kleikamp break; 977ac27a0ecSDave Kleikamp case Opt_nouser_xattr: 978ac27a0ecSDave Kleikamp clear_opt (sbi->s_mount_opt, XATTR_USER); 979ac27a0ecSDave Kleikamp break; 980ac27a0ecSDave Kleikamp #else 981ac27a0ecSDave Kleikamp case Opt_user_xattr: 982ac27a0ecSDave Kleikamp case Opt_nouser_xattr: 983617ba13bSMingming Cao printk("EXT4 (no)user_xattr options not supported\n"); 984ac27a0ecSDave Kleikamp break; 985ac27a0ecSDave Kleikamp #endif 986617ba13bSMingming Cao #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 987ac27a0ecSDave Kleikamp case Opt_acl: 988ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, POSIX_ACL); 989ac27a0ecSDave Kleikamp break; 990ac27a0ecSDave Kleikamp case Opt_noacl: 991ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, POSIX_ACL); 992ac27a0ecSDave Kleikamp break; 993ac27a0ecSDave Kleikamp #else 994ac27a0ecSDave Kleikamp case Opt_acl: 995ac27a0ecSDave Kleikamp case Opt_noacl: 996617ba13bSMingming Cao printk("EXT4 (no)acl options not supported\n"); 997ac27a0ecSDave Kleikamp break; 998ac27a0ecSDave Kleikamp #endif 999ac27a0ecSDave Kleikamp case Opt_reservation: 1000ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, RESERVATION); 1001ac27a0ecSDave Kleikamp break; 1002ac27a0ecSDave Kleikamp case Opt_noreservation: 1003ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, RESERVATION); 1004ac27a0ecSDave Kleikamp break; 1005ac27a0ecSDave Kleikamp case Opt_journal_update: 1006ac27a0ecSDave Kleikamp /* @@@ FIXME */ 1007ac27a0ecSDave Kleikamp /* Eventually we will want to be able to create 1008ac27a0ecSDave Kleikamp a journal file here. For now, only allow the 1009ac27a0ecSDave Kleikamp user to specify an existing inode to be the 1010ac27a0ecSDave Kleikamp journal file. */ 1011ac27a0ecSDave Kleikamp if (is_remount) { 1012617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: cannot specify " 1013ac27a0ecSDave Kleikamp "journal on remount\n"); 1014ac27a0ecSDave Kleikamp return 0; 1015ac27a0ecSDave Kleikamp } 1016ac27a0ecSDave Kleikamp set_opt (sbi->s_mount_opt, UPDATE_JOURNAL); 1017ac27a0ecSDave Kleikamp break; 1018ac27a0ecSDave Kleikamp case Opt_journal_inum: 1019ac27a0ecSDave Kleikamp if (is_remount) { 1020617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: cannot specify " 1021ac27a0ecSDave Kleikamp "journal on remount\n"); 1022ac27a0ecSDave Kleikamp return 0; 1023ac27a0ecSDave Kleikamp } 1024ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 1025ac27a0ecSDave Kleikamp return 0; 1026ac27a0ecSDave Kleikamp *inum = option; 1027ac27a0ecSDave Kleikamp break; 1028ac27a0ecSDave Kleikamp case Opt_journal_dev: 1029ac27a0ecSDave Kleikamp if (is_remount) { 1030617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: cannot specify " 1031ac27a0ecSDave Kleikamp "journal on remount\n"); 1032ac27a0ecSDave Kleikamp return 0; 1033ac27a0ecSDave Kleikamp } 1034ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 1035ac27a0ecSDave Kleikamp return 0; 1036ac27a0ecSDave Kleikamp *journal_devnum = option; 1037ac27a0ecSDave Kleikamp break; 1038ac27a0ecSDave Kleikamp case Opt_noload: 1039ac27a0ecSDave Kleikamp set_opt (sbi->s_mount_opt, NOLOAD); 1040ac27a0ecSDave Kleikamp break; 1041ac27a0ecSDave Kleikamp case Opt_commit: 1042ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 1043ac27a0ecSDave Kleikamp return 0; 1044ac27a0ecSDave Kleikamp if (option < 0) 1045ac27a0ecSDave Kleikamp return 0; 1046ac27a0ecSDave Kleikamp if (option == 0) 1047cd02ff0bSMingming Cao option = JBD2_DEFAULT_MAX_COMMIT_AGE; 1048ac27a0ecSDave Kleikamp sbi->s_commit_interval = HZ * option; 1049ac27a0ecSDave Kleikamp break; 1050ac27a0ecSDave Kleikamp case Opt_data_journal: 1051617ba13bSMingming Cao data_opt = EXT4_MOUNT_JOURNAL_DATA; 1052ac27a0ecSDave Kleikamp goto datacheck; 1053ac27a0ecSDave Kleikamp case Opt_data_ordered: 1054617ba13bSMingming Cao data_opt = EXT4_MOUNT_ORDERED_DATA; 1055ac27a0ecSDave Kleikamp goto datacheck; 1056ac27a0ecSDave Kleikamp case Opt_data_writeback: 1057617ba13bSMingming Cao data_opt = EXT4_MOUNT_WRITEBACK_DATA; 1058ac27a0ecSDave Kleikamp datacheck: 1059ac27a0ecSDave Kleikamp if (is_remount) { 1060617ba13bSMingming Cao if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS) 1061ac27a0ecSDave Kleikamp != data_opt) { 1062ac27a0ecSDave Kleikamp printk(KERN_ERR 1063617ba13bSMingming Cao "EXT4-fs: cannot change data " 1064ac27a0ecSDave Kleikamp "mode on remount\n"); 1065ac27a0ecSDave Kleikamp return 0; 1066ac27a0ecSDave Kleikamp } 1067ac27a0ecSDave Kleikamp } else { 1068617ba13bSMingming Cao sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS; 1069ac27a0ecSDave Kleikamp sbi->s_mount_opt |= data_opt; 1070ac27a0ecSDave Kleikamp } 1071ac27a0ecSDave Kleikamp break; 1072ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1073ac27a0ecSDave Kleikamp case Opt_usrjquota: 1074ac27a0ecSDave Kleikamp qtype = USRQUOTA; 1075ac27a0ecSDave Kleikamp goto set_qf_name; 1076ac27a0ecSDave Kleikamp case Opt_grpjquota: 1077ac27a0ecSDave Kleikamp qtype = GRPQUOTA; 1078ac27a0ecSDave Kleikamp set_qf_name: 1079ac27a0ecSDave Kleikamp if (sb_any_quota_enabled(sb)) { 1080ac27a0ecSDave Kleikamp printk(KERN_ERR 1081617ba13bSMingming Cao "EXT4-fs: Cannot change journalled " 1082ac27a0ecSDave Kleikamp "quota options when quota turned on.\n"); 1083ac27a0ecSDave Kleikamp return 0; 1084ac27a0ecSDave Kleikamp } 1085ac27a0ecSDave Kleikamp qname = match_strdup(&args[0]); 1086ac27a0ecSDave Kleikamp if (!qname) { 1087ac27a0ecSDave Kleikamp printk(KERN_ERR 1088617ba13bSMingming Cao "EXT4-fs: not enough memory for " 1089ac27a0ecSDave Kleikamp "storing quotafile name.\n"); 1090ac27a0ecSDave Kleikamp return 0; 1091ac27a0ecSDave Kleikamp } 1092ac27a0ecSDave Kleikamp if (sbi->s_qf_names[qtype] && 1093ac27a0ecSDave Kleikamp strcmp(sbi->s_qf_names[qtype], qname)) { 1094ac27a0ecSDave Kleikamp printk(KERN_ERR 1095617ba13bSMingming Cao "EXT4-fs: %s quota file already " 1096ac27a0ecSDave Kleikamp "specified.\n", QTYPE2NAME(qtype)); 1097ac27a0ecSDave Kleikamp kfree(qname); 1098ac27a0ecSDave Kleikamp return 0; 1099ac27a0ecSDave Kleikamp } 1100ac27a0ecSDave Kleikamp sbi->s_qf_names[qtype] = qname; 1101ac27a0ecSDave Kleikamp if (strchr(sbi->s_qf_names[qtype], '/')) { 1102ac27a0ecSDave Kleikamp printk(KERN_ERR 1103617ba13bSMingming Cao "EXT4-fs: quotafile must be on " 1104ac27a0ecSDave Kleikamp "filesystem root.\n"); 1105ac27a0ecSDave Kleikamp kfree(sbi->s_qf_names[qtype]); 1106ac27a0ecSDave Kleikamp sbi->s_qf_names[qtype] = NULL; 1107ac27a0ecSDave Kleikamp return 0; 1108ac27a0ecSDave Kleikamp } 1109ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, QUOTA); 1110ac27a0ecSDave Kleikamp break; 1111ac27a0ecSDave Kleikamp case Opt_offusrjquota: 1112ac27a0ecSDave Kleikamp qtype = USRQUOTA; 1113ac27a0ecSDave Kleikamp goto clear_qf_name; 1114ac27a0ecSDave Kleikamp case Opt_offgrpjquota: 1115ac27a0ecSDave Kleikamp qtype = GRPQUOTA; 1116ac27a0ecSDave Kleikamp clear_qf_name: 1117ac27a0ecSDave Kleikamp if (sb_any_quota_enabled(sb)) { 1118617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: Cannot change " 1119ac27a0ecSDave Kleikamp "journalled quota options when " 1120ac27a0ecSDave Kleikamp "quota turned on.\n"); 1121ac27a0ecSDave Kleikamp return 0; 1122ac27a0ecSDave Kleikamp } 1123ac27a0ecSDave Kleikamp /* 1124ac27a0ecSDave Kleikamp * The space will be released later when all options 1125ac27a0ecSDave Kleikamp * are confirmed to be correct 1126ac27a0ecSDave Kleikamp */ 1127ac27a0ecSDave Kleikamp sbi->s_qf_names[qtype] = NULL; 1128ac27a0ecSDave Kleikamp break; 1129ac27a0ecSDave Kleikamp case Opt_jqfmt_vfsold: 1130ac27a0ecSDave Kleikamp sbi->s_jquota_fmt = QFMT_VFS_OLD; 1131ac27a0ecSDave Kleikamp break; 1132ac27a0ecSDave Kleikamp case Opt_jqfmt_vfsv0: 1133ac27a0ecSDave Kleikamp sbi->s_jquota_fmt = QFMT_VFS_V0; 1134ac27a0ecSDave Kleikamp break; 1135ac27a0ecSDave Kleikamp case Opt_quota: 1136ac27a0ecSDave Kleikamp case Opt_usrquota: 1137ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, QUOTA); 1138ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, USRQUOTA); 1139ac27a0ecSDave Kleikamp break; 1140ac27a0ecSDave Kleikamp case Opt_grpquota: 1141ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, QUOTA); 1142ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, GRPQUOTA); 1143ac27a0ecSDave Kleikamp break; 1144ac27a0ecSDave Kleikamp case Opt_noquota: 1145ac27a0ecSDave Kleikamp if (sb_any_quota_enabled(sb)) { 1146617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: Cannot change quota " 1147ac27a0ecSDave Kleikamp "options when quota turned on.\n"); 1148ac27a0ecSDave Kleikamp return 0; 1149ac27a0ecSDave Kleikamp } 1150ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, QUOTA); 1151ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, USRQUOTA); 1152ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, GRPQUOTA); 1153ac27a0ecSDave Kleikamp break; 1154ac27a0ecSDave Kleikamp #else 1155ac27a0ecSDave Kleikamp case Opt_quota: 1156ac27a0ecSDave Kleikamp case Opt_usrquota: 1157ac27a0ecSDave Kleikamp case Opt_grpquota: 1158ac27a0ecSDave Kleikamp case Opt_usrjquota: 1159ac27a0ecSDave Kleikamp case Opt_grpjquota: 1160ac27a0ecSDave Kleikamp case Opt_offusrjquota: 1161ac27a0ecSDave Kleikamp case Opt_offgrpjquota: 1162ac27a0ecSDave Kleikamp case Opt_jqfmt_vfsold: 1163ac27a0ecSDave Kleikamp case Opt_jqfmt_vfsv0: 1164ac27a0ecSDave Kleikamp printk(KERN_ERR 1165617ba13bSMingming Cao "EXT4-fs: journalled quota options not " 1166ac27a0ecSDave Kleikamp "supported.\n"); 1167ac27a0ecSDave Kleikamp break; 1168ac27a0ecSDave Kleikamp case Opt_noquota: 1169ac27a0ecSDave Kleikamp break; 1170ac27a0ecSDave Kleikamp #endif 1171ac27a0ecSDave Kleikamp case Opt_abort: 1172ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, ABORT); 1173ac27a0ecSDave Kleikamp break; 1174ac27a0ecSDave Kleikamp case Opt_barrier: 1175ac27a0ecSDave Kleikamp if (match_int(&args[0], &option)) 1176ac27a0ecSDave Kleikamp return 0; 1177ac27a0ecSDave Kleikamp if (option) 1178ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, BARRIER); 1179ac27a0ecSDave Kleikamp else 1180ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, BARRIER); 1181ac27a0ecSDave Kleikamp break; 1182ac27a0ecSDave Kleikamp case Opt_ignore: 1183ac27a0ecSDave Kleikamp break; 1184ac27a0ecSDave Kleikamp case Opt_resize: 1185ac27a0ecSDave Kleikamp if (!is_remount) { 1186617ba13bSMingming Cao printk("EXT4-fs: resize option only available " 1187ac27a0ecSDave Kleikamp "for remount\n"); 1188ac27a0ecSDave Kleikamp return 0; 1189ac27a0ecSDave Kleikamp } 1190ac27a0ecSDave Kleikamp if (match_int(&args[0], &option) != 0) 1191ac27a0ecSDave Kleikamp return 0; 1192ac27a0ecSDave Kleikamp *n_blocks_count = option; 1193ac27a0ecSDave Kleikamp break; 1194ac27a0ecSDave Kleikamp case Opt_nobh: 1195ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, NOBH); 1196ac27a0ecSDave Kleikamp break; 1197ac27a0ecSDave Kleikamp case Opt_bh: 1198ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, NOBH); 1199ac27a0ecSDave Kleikamp break; 1200a86c6181SAlex Tomas case Opt_extents: 1201a86c6181SAlex Tomas set_opt (sbi->s_mount_opt, EXTENTS); 1202a86c6181SAlex Tomas break; 12031e2462f9SMingming Cao case Opt_noextents: 12041e2462f9SMingming Cao clear_opt (sbi->s_mount_opt, EXTENTS); 12051e2462f9SMingming Cao break; 1206ac27a0ecSDave Kleikamp default: 1207ac27a0ecSDave Kleikamp printk (KERN_ERR 1208617ba13bSMingming Cao "EXT4-fs: Unrecognized mount option \"%s\" " 1209ac27a0ecSDave Kleikamp "or missing value\n", p); 1210ac27a0ecSDave Kleikamp return 0; 1211ac27a0ecSDave Kleikamp } 1212ac27a0ecSDave Kleikamp } 1213ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1214ac27a0ecSDave Kleikamp if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { 1215617ba13bSMingming Cao if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) && 1216ac27a0ecSDave Kleikamp sbi->s_qf_names[USRQUOTA]) 1217ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, USRQUOTA); 1218ac27a0ecSDave Kleikamp 1219617ba13bSMingming Cao if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) && 1220ac27a0ecSDave Kleikamp sbi->s_qf_names[GRPQUOTA]) 1221ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, GRPQUOTA); 1222ac27a0ecSDave Kleikamp 1223ac27a0ecSDave Kleikamp if ((sbi->s_qf_names[USRQUOTA] && 1224617ba13bSMingming Cao (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) || 1225ac27a0ecSDave Kleikamp (sbi->s_qf_names[GRPQUOTA] && 1226617ba13bSMingming Cao (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) { 1227617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: old and new quota " 1228ac27a0ecSDave Kleikamp "format mixing.\n"); 1229ac27a0ecSDave Kleikamp return 0; 1230ac27a0ecSDave Kleikamp } 1231ac27a0ecSDave Kleikamp 1232ac27a0ecSDave Kleikamp if (!sbi->s_jquota_fmt) { 1233617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: journalled quota format " 1234ac27a0ecSDave Kleikamp "not specified.\n"); 1235ac27a0ecSDave Kleikamp return 0; 1236ac27a0ecSDave Kleikamp } 1237ac27a0ecSDave Kleikamp } else { 1238ac27a0ecSDave Kleikamp if (sbi->s_jquota_fmt) { 1239617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: journalled quota format " 1240ac27a0ecSDave Kleikamp "specified with no journalling " 1241ac27a0ecSDave Kleikamp "enabled.\n"); 1242ac27a0ecSDave Kleikamp return 0; 1243ac27a0ecSDave Kleikamp } 1244ac27a0ecSDave Kleikamp } 1245ac27a0ecSDave Kleikamp #endif 1246ac27a0ecSDave Kleikamp return 1; 1247ac27a0ecSDave Kleikamp } 1248ac27a0ecSDave Kleikamp 1249617ba13bSMingming Cao static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, 1250ac27a0ecSDave Kleikamp int read_only) 1251ac27a0ecSDave Kleikamp { 1252617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 1253ac27a0ecSDave Kleikamp int res = 0; 1254ac27a0ecSDave Kleikamp 1255617ba13bSMingming Cao if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { 1256617ba13bSMingming Cao printk (KERN_ERR "EXT4-fs warning: revision level too high, " 1257ac27a0ecSDave Kleikamp "forcing read-only mode\n"); 1258ac27a0ecSDave Kleikamp res = MS_RDONLY; 1259ac27a0ecSDave Kleikamp } 1260ac27a0ecSDave Kleikamp if (read_only) 1261ac27a0ecSDave Kleikamp return res; 1262617ba13bSMingming Cao if (!(sbi->s_mount_state & EXT4_VALID_FS)) 1263617ba13bSMingming Cao printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, " 1264ac27a0ecSDave Kleikamp "running e2fsck is recommended\n"); 1265617ba13bSMingming Cao else if ((sbi->s_mount_state & EXT4_ERROR_FS)) 1266ac27a0ecSDave Kleikamp printk (KERN_WARNING 1267617ba13bSMingming Cao "EXT4-fs warning: mounting fs with errors, " 1268ac27a0ecSDave Kleikamp "running e2fsck is recommended\n"); 1269ac27a0ecSDave Kleikamp else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 1270ac27a0ecSDave Kleikamp le16_to_cpu(es->s_mnt_count) >= 1271ac27a0ecSDave Kleikamp (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 1272ac27a0ecSDave Kleikamp printk (KERN_WARNING 1273617ba13bSMingming Cao "EXT4-fs warning: maximal mount count reached, " 1274ac27a0ecSDave Kleikamp "running e2fsck is recommended\n"); 1275ac27a0ecSDave Kleikamp else if (le32_to_cpu(es->s_checkinterval) && 1276ac27a0ecSDave Kleikamp (le32_to_cpu(es->s_lastcheck) + 1277ac27a0ecSDave Kleikamp le32_to_cpu(es->s_checkinterval) <= get_seconds())) 1278ac27a0ecSDave Kleikamp printk (KERN_WARNING 1279617ba13bSMingming Cao "EXT4-fs warning: checktime reached, " 1280ac27a0ecSDave Kleikamp "running e2fsck is recommended\n"); 1281ac27a0ecSDave Kleikamp #if 0 1282ac27a0ecSDave Kleikamp /* @@@ We _will_ want to clear the valid bit if we find 128363f57933SAndrew Morton * inconsistencies, to force a fsck at reboot. But for 128463f57933SAndrew Morton * a plain journaled filesystem we can keep it set as 128563f57933SAndrew Morton * valid forever! :) 128663f57933SAndrew Morton */ 1287617ba13bSMingming Cao es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS); 1288ac27a0ecSDave Kleikamp #endif 1289ac27a0ecSDave Kleikamp if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) 1290617ba13bSMingming Cao es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); 1291ac27a0ecSDave Kleikamp es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1); 1292ac27a0ecSDave Kleikamp es->s_mtime = cpu_to_le32(get_seconds()); 1293617ba13bSMingming Cao ext4_update_dynamic_rev(sb); 1294617ba13bSMingming Cao EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 1295ac27a0ecSDave Kleikamp 1296617ba13bSMingming Cao ext4_commit_super(sb, es, 1); 1297ac27a0ecSDave Kleikamp if (test_opt(sb, DEBUG)) 1298617ba13bSMingming Cao printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, " 1299ac27a0ecSDave Kleikamp "bpg=%lu, ipg=%lu, mo=%04lx]\n", 1300ac27a0ecSDave Kleikamp sb->s_blocksize, 1301ac27a0ecSDave Kleikamp sbi->s_groups_count, 1302617ba13bSMingming Cao EXT4_BLOCKS_PER_GROUP(sb), 1303617ba13bSMingming Cao EXT4_INODES_PER_GROUP(sb), 1304ac27a0ecSDave Kleikamp sbi->s_mount_opt); 1305ac27a0ecSDave Kleikamp 1306617ba13bSMingming Cao printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id); 1307617ba13bSMingming Cao if (EXT4_SB(sb)->s_journal->j_inode == NULL) { 1308ac27a0ecSDave Kleikamp char b[BDEVNAME_SIZE]; 1309ac27a0ecSDave Kleikamp 1310ac27a0ecSDave Kleikamp printk("external journal on %s\n", 1311617ba13bSMingming Cao bdevname(EXT4_SB(sb)->s_journal->j_dev, b)); 1312ac27a0ecSDave Kleikamp } else { 1313ac27a0ecSDave Kleikamp printk("internal journal\n"); 1314ac27a0ecSDave Kleikamp } 1315ac27a0ecSDave Kleikamp return res; 1316ac27a0ecSDave Kleikamp } 1317ac27a0ecSDave Kleikamp 1318717d50e4SAndreas Dilger __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group, 1319717d50e4SAndreas Dilger struct ext4_group_desc *gdp) 1320717d50e4SAndreas Dilger { 1321717d50e4SAndreas Dilger __u16 crc = 0; 1322717d50e4SAndreas Dilger 1323717d50e4SAndreas Dilger if (sbi->s_es->s_feature_ro_compat & 1324717d50e4SAndreas Dilger cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { 1325717d50e4SAndreas Dilger int offset = offsetof(struct ext4_group_desc, bg_checksum); 1326717d50e4SAndreas Dilger __le32 le_group = cpu_to_le32(block_group); 1327717d50e4SAndreas Dilger 1328717d50e4SAndreas Dilger crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); 1329717d50e4SAndreas Dilger crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); 1330717d50e4SAndreas Dilger crc = crc16(crc, (__u8 *)gdp, offset); 1331717d50e4SAndreas Dilger offset += sizeof(gdp->bg_checksum); /* skip checksum */ 1332717d50e4SAndreas Dilger /* for checksum of struct ext4_group_desc do the rest...*/ 1333717d50e4SAndreas Dilger if ((sbi->s_es->s_feature_incompat & 1334717d50e4SAndreas Dilger cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) && 1335717d50e4SAndreas Dilger offset < le16_to_cpu(sbi->s_es->s_desc_size)) 1336717d50e4SAndreas Dilger crc = crc16(crc, (__u8 *)gdp + offset, 1337717d50e4SAndreas Dilger le16_to_cpu(sbi->s_es->s_desc_size) - 1338717d50e4SAndreas Dilger offset); 1339717d50e4SAndreas Dilger } 1340717d50e4SAndreas Dilger 1341717d50e4SAndreas Dilger return cpu_to_le16(crc); 1342717d50e4SAndreas Dilger } 1343717d50e4SAndreas Dilger 1344717d50e4SAndreas Dilger int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group, 1345717d50e4SAndreas Dilger struct ext4_group_desc *gdp) 1346717d50e4SAndreas Dilger { 1347717d50e4SAndreas Dilger if ((sbi->s_es->s_feature_ro_compat & 1348717d50e4SAndreas Dilger cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) && 1349717d50e4SAndreas Dilger (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp))) 1350717d50e4SAndreas Dilger return 0; 1351717d50e4SAndreas Dilger 1352717d50e4SAndreas Dilger return 1; 1353717d50e4SAndreas Dilger } 1354717d50e4SAndreas Dilger 1355ac27a0ecSDave Kleikamp /* Called at mount-time, super-block is locked */ 1356617ba13bSMingming Cao static int ext4_check_descriptors (struct super_block * sb) 1357ac27a0ecSDave Kleikamp { 1358617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 1359617ba13bSMingming Cao ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); 1360617ba13bSMingming Cao ext4_fsblk_t last_block; 1361bd81d8eeSLaurent Vivier ext4_fsblk_t block_bitmap; 1362bd81d8eeSLaurent Vivier ext4_fsblk_t inode_bitmap; 1363bd81d8eeSLaurent Vivier ext4_fsblk_t inode_table; 1364617ba13bSMingming Cao struct ext4_group_desc * gdp = NULL; 1365ac27a0ecSDave Kleikamp int desc_block = 0; 1366ce421581SJose R. Santos int flexbg_flag = 0; 1367ac27a0ecSDave Kleikamp int i; 1368ac27a0ecSDave Kleikamp 1369ce421581SJose R. Santos if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 1370ce421581SJose R. Santos flexbg_flag = 1; 1371ce421581SJose R. Santos 1372617ba13bSMingming Cao ext4_debug ("Checking group descriptors"); 1373ac27a0ecSDave Kleikamp 1374ac27a0ecSDave Kleikamp for (i = 0; i < sbi->s_groups_count; i++) 1375ac27a0ecSDave Kleikamp { 1376ce421581SJose R. Santos if (i == sbi->s_groups_count - 1 || flexbg_flag) 1377bd81d8eeSLaurent Vivier last_block = ext4_blocks_count(sbi->s_es) - 1; 1378ac27a0ecSDave Kleikamp else 1379ac27a0ecSDave Kleikamp last_block = first_block + 1380617ba13bSMingming Cao (EXT4_BLOCKS_PER_GROUP(sb) - 1); 1381ac27a0ecSDave Kleikamp 1382617ba13bSMingming Cao if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0) 1383617ba13bSMingming Cao gdp = (struct ext4_group_desc *) 1384ac27a0ecSDave Kleikamp sbi->s_group_desc[desc_block++]->b_data; 13858fadc143SAlexandre Ratchov block_bitmap = ext4_block_bitmap(sb, gdp); 1386bd81d8eeSLaurent Vivier if (block_bitmap < first_block || block_bitmap > last_block) 1387ac27a0ecSDave Kleikamp { 1388617ba13bSMingming Cao ext4_error (sb, "ext4_check_descriptors", 1389ac27a0ecSDave Kleikamp "Block bitmap for group %d" 13902ae02107SMingming Cao " not in group (block %llu)!", 1391bd81d8eeSLaurent Vivier i, block_bitmap); 1392ac27a0ecSDave Kleikamp return 0; 1393ac27a0ecSDave Kleikamp } 13948fadc143SAlexandre Ratchov inode_bitmap = ext4_inode_bitmap(sb, gdp); 1395bd81d8eeSLaurent Vivier if (inode_bitmap < first_block || inode_bitmap > last_block) 1396ac27a0ecSDave Kleikamp { 1397617ba13bSMingming Cao ext4_error (sb, "ext4_check_descriptors", 1398ac27a0ecSDave Kleikamp "Inode bitmap for group %d" 13992ae02107SMingming Cao " not in group (block %llu)!", 1400bd81d8eeSLaurent Vivier i, inode_bitmap); 1401ac27a0ecSDave Kleikamp return 0; 1402ac27a0ecSDave Kleikamp } 14038fadc143SAlexandre Ratchov inode_table = ext4_inode_table(sb, gdp); 1404bd81d8eeSLaurent Vivier if (inode_table < first_block || 1405780dcdb2SEric Sandeen inode_table + sbi->s_itb_per_group - 1 > last_block) 1406ac27a0ecSDave Kleikamp { 1407617ba13bSMingming Cao ext4_error (sb, "ext4_check_descriptors", 1408ac27a0ecSDave Kleikamp "Inode table for group %d" 14092ae02107SMingming Cao " not in group (block %llu)!", 1410bd81d8eeSLaurent Vivier i, inode_table); 1411ac27a0ecSDave Kleikamp return 0; 1412ac27a0ecSDave Kleikamp } 1413717d50e4SAndreas Dilger if (!ext4_group_desc_csum_verify(sbi, i, gdp)) { 1414717d50e4SAndreas Dilger ext4_error(sb, __FUNCTION__, 1415717d50e4SAndreas Dilger "Checksum for group %d failed (%u!=%u)\n", i, 1416717d50e4SAndreas Dilger le16_to_cpu(ext4_group_desc_csum(sbi, i, 1417717d50e4SAndreas Dilger gdp)), 1418717d50e4SAndreas Dilger le16_to_cpu(gdp->bg_checksum)); 1419717d50e4SAndreas Dilger return 0; 1420717d50e4SAndreas Dilger } 1421ce421581SJose R. Santos if (!flexbg_flag) 1422617ba13bSMingming Cao first_block += EXT4_BLOCKS_PER_GROUP(sb); 14230d1ee42fSAlexandre Ratchov gdp = (struct ext4_group_desc *) 14240d1ee42fSAlexandre Ratchov ((__u8 *)gdp + EXT4_DESC_SIZE(sb)); 1425ac27a0ecSDave Kleikamp } 1426ac27a0ecSDave Kleikamp 1427bd81d8eeSLaurent Vivier ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb)); 1428617ba13bSMingming Cao sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb)); 1429ac27a0ecSDave Kleikamp return 1; 1430ac27a0ecSDave Kleikamp } 1431ac27a0ecSDave Kleikamp 1432ac27a0ecSDave Kleikamp 1433617ba13bSMingming Cao /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at 1434ac27a0ecSDave Kleikamp * the superblock) which were deleted from all directories, but held open by 1435ac27a0ecSDave Kleikamp * a process at the time of a crash. We walk the list and try to delete these 1436ac27a0ecSDave Kleikamp * inodes at recovery time (only with a read-write filesystem). 1437ac27a0ecSDave Kleikamp * 1438ac27a0ecSDave Kleikamp * In order to keep the orphan inode chain consistent during traversal (in 1439ac27a0ecSDave Kleikamp * case of crash during recovery), we link each inode into the superblock 1440ac27a0ecSDave Kleikamp * orphan list_head and handle it the same way as an inode deletion during 1441ac27a0ecSDave Kleikamp * normal operation (which journals the operations for us). 1442ac27a0ecSDave Kleikamp * 1443ac27a0ecSDave Kleikamp * We only do an iget() and an iput() on each inode, which is very safe if we 1444ac27a0ecSDave Kleikamp * accidentally point at an in-use or already deleted inode. The worst that 1445ac27a0ecSDave Kleikamp * can happen in this case is that we get a "bit already cleared" message from 1446617ba13bSMingming Cao * ext4_free_inode(). The only reason we would point at a wrong inode is if 1447ac27a0ecSDave Kleikamp * e2fsck was run on this filesystem, and it must have already done the orphan 1448ac27a0ecSDave Kleikamp * inode cleanup for us, so we can safely abort without any further action. 1449ac27a0ecSDave Kleikamp */ 1450617ba13bSMingming Cao static void ext4_orphan_cleanup (struct super_block * sb, 1451617ba13bSMingming Cao struct ext4_super_block * es) 1452ac27a0ecSDave Kleikamp { 1453ac27a0ecSDave Kleikamp unsigned int s_flags = sb->s_flags; 1454ac27a0ecSDave Kleikamp int nr_orphans = 0, nr_truncates = 0; 1455ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1456ac27a0ecSDave Kleikamp int i; 1457ac27a0ecSDave Kleikamp #endif 1458ac27a0ecSDave Kleikamp if (!es->s_last_orphan) { 1459ac27a0ecSDave Kleikamp jbd_debug(4, "no orphan inodes to clean up\n"); 1460ac27a0ecSDave Kleikamp return; 1461ac27a0ecSDave Kleikamp } 1462ac27a0ecSDave Kleikamp 1463a8f48a95SEric Sandeen if (bdev_read_only(sb->s_bdev)) { 1464a8f48a95SEric Sandeen printk(KERN_ERR "EXT4-fs: write access " 1465a8f48a95SEric Sandeen "unavailable, skipping orphan cleanup.\n"); 1466a8f48a95SEric Sandeen return; 1467a8f48a95SEric Sandeen } 1468a8f48a95SEric Sandeen 1469617ba13bSMingming Cao if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { 1470ac27a0ecSDave Kleikamp if (es->s_last_orphan) 1471ac27a0ecSDave Kleikamp jbd_debug(1, "Errors on filesystem, " 1472ac27a0ecSDave Kleikamp "clearing orphan list.\n"); 1473ac27a0ecSDave Kleikamp es->s_last_orphan = 0; 1474ac27a0ecSDave Kleikamp jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); 1475ac27a0ecSDave Kleikamp return; 1476ac27a0ecSDave Kleikamp } 1477ac27a0ecSDave Kleikamp 1478ac27a0ecSDave Kleikamp if (s_flags & MS_RDONLY) { 1479617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n", 1480ac27a0ecSDave Kleikamp sb->s_id); 1481ac27a0ecSDave Kleikamp sb->s_flags &= ~MS_RDONLY; 1482ac27a0ecSDave Kleikamp } 1483ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1484ac27a0ecSDave Kleikamp /* Needed for iput() to work correctly and not trash data */ 1485ac27a0ecSDave Kleikamp sb->s_flags |= MS_ACTIVE; 1486ac27a0ecSDave Kleikamp /* Turn on quotas so that they are updated correctly */ 1487ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) { 1488617ba13bSMingming Cao if (EXT4_SB(sb)->s_qf_names[i]) { 1489617ba13bSMingming Cao int ret = ext4_quota_on_mount(sb, i); 1490ac27a0ecSDave Kleikamp if (ret < 0) 1491ac27a0ecSDave Kleikamp printk(KERN_ERR 1492617ba13bSMingming Cao "EXT4-fs: Cannot turn on journalled " 1493ac27a0ecSDave Kleikamp "quota: error %d\n", ret); 1494ac27a0ecSDave Kleikamp } 1495ac27a0ecSDave Kleikamp } 1496ac27a0ecSDave Kleikamp #endif 1497ac27a0ecSDave Kleikamp 1498ac27a0ecSDave Kleikamp while (es->s_last_orphan) { 1499ac27a0ecSDave Kleikamp struct inode *inode; 1500ac27a0ecSDave Kleikamp 1501ac27a0ecSDave Kleikamp if (!(inode = 1502617ba13bSMingming Cao ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) { 1503ac27a0ecSDave Kleikamp es->s_last_orphan = 0; 1504ac27a0ecSDave Kleikamp break; 1505ac27a0ecSDave Kleikamp } 1506ac27a0ecSDave Kleikamp 1507617ba13bSMingming Cao list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); 1508ac27a0ecSDave Kleikamp DQUOT_INIT(inode); 1509ac27a0ecSDave Kleikamp if (inode->i_nlink) { 1510ac27a0ecSDave Kleikamp printk(KERN_DEBUG 1511ac27a0ecSDave Kleikamp "%s: truncating inode %lu to %Ld bytes\n", 1512ac27a0ecSDave Kleikamp __FUNCTION__, inode->i_ino, inode->i_size); 1513ac27a0ecSDave Kleikamp jbd_debug(2, "truncating inode %lu to %Ld bytes\n", 1514ac27a0ecSDave Kleikamp inode->i_ino, inode->i_size); 1515617ba13bSMingming Cao ext4_truncate(inode); 1516ac27a0ecSDave Kleikamp nr_truncates++; 1517ac27a0ecSDave Kleikamp } else { 1518ac27a0ecSDave Kleikamp printk(KERN_DEBUG 1519ac27a0ecSDave Kleikamp "%s: deleting unreferenced inode %lu\n", 1520ac27a0ecSDave Kleikamp __FUNCTION__, inode->i_ino); 1521ac27a0ecSDave Kleikamp jbd_debug(2, "deleting unreferenced inode %lu\n", 1522ac27a0ecSDave Kleikamp inode->i_ino); 1523ac27a0ecSDave Kleikamp nr_orphans++; 1524ac27a0ecSDave Kleikamp } 1525ac27a0ecSDave Kleikamp iput(inode); /* The delete magic happens here! */ 1526ac27a0ecSDave Kleikamp } 1527ac27a0ecSDave Kleikamp 1528ac27a0ecSDave Kleikamp #define PLURAL(x) (x), ((x)==1) ? "" : "s" 1529ac27a0ecSDave Kleikamp 1530ac27a0ecSDave Kleikamp if (nr_orphans) 1531617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n", 1532ac27a0ecSDave Kleikamp sb->s_id, PLURAL(nr_orphans)); 1533ac27a0ecSDave Kleikamp if (nr_truncates) 1534617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n", 1535ac27a0ecSDave Kleikamp sb->s_id, PLURAL(nr_truncates)); 1536ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1537ac27a0ecSDave Kleikamp /* Turn quotas off */ 1538ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) { 1539ac27a0ecSDave Kleikamp if (sb_dqopt(sb)->files[i]) 1540ac27a0ecSDave Kleikamp vfs_quota_off(sb, i); 1541ac27a0ecSDave Kleikamp } 1542ac27a0ecSDave Kleikamp #endif 1543ac27a0ecSDave Kleikamp sb->s_flags = s_flags; /* Restore MS_RDONLY status */ 1544ac27a0ecSDave Kleikamp } 1545ac27a0ecSDave Kleikamp 1546ac27a0ecSDave Kleikamp /* 1547ac27a0ecSDave Kleikamp * Maximal file size. There is a direct, and {,double-,triple-}indirect 1548ac27a0ecSDave Kleikamp * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. 1549ac27a0ecSDave Kleikamp * We need to be 1 filesystem block less than the 2^32 sector limit. 1550ac27a0ecSDave Kleikamp */ 1551617ba13bSMingming Cao static loff_t ext4_max_size(int bits) 1552ac27a0ecSDave Kleikamp { 1553617ba13bSMingming Cao loff_t res = EXT4_NDIR_BLOCKS; 1554ac27a0ecSDave Kleikamp /* This constant is calculated to be the largest file size for a 1555ac27a0ecSDave Kleikamp * dense, 4k-blocksize file such that the total number of 1556ac27a0ecSDave Kleikamp * sectors in the file, including data and all indirect blocks, 1557ac27a0ecSDave Kleikamp * does not exceed 2^32. */ 1558ac27a0ecSDave Kleikamp const loff_t upper_limit = 0x1ff7fffd000LL; 1559ac27a0ecSDave Kleikamp 1560ac27a0ecSDave Kleikamp res += 1LL << (bits-2); 1561ac27a0ecSDave Kleikamp res += 1LL << (2*(bits-2)); 1562ac27a0ecSDave Kleikamp res += 1LL << (3*(bits-2)); 1563ac27a0ecSDave Kleikamp res <<= bits; 1564ac27a0ecSDave Kleikamp if (res > upper_limit) 1565ac27a0ecSDave Kleikamp res = upper_limit; 1566ac27a0ecSDave Kleikamp return res; 1567ac27a0ecSDave Kleikamp } 1568ac27a0ecSDave Kleikamp 1569617ba13bSMingming Cao static ext4_fsblk_t descriptor_loc(struct super_block *sb, 157070bbb3e0SAndrew Morton ext4_fsblk_t logical_sb_block, int nr) 1571ac27a0ecSDave Kleikamp { 1572617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 1573ac27a0ecSDave Kleikamp unsigned long bg, first_meta_bg; 1574ac27a0ecSDave Kleikamp int has_super = 0; 1575ac27a0ecSDave Kleikamp 1576ac27a0ecSDave Kleikamp first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 1577ac27a0ecSDave Kleikamp 1578617ba13bSMingming Cao if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || 1579ac27a0ecSDave Kleikamp nr < first_meta_bg) 158070bbb3e0SAndrew Morton return logical_sb_block + nr + 1; 1581ac27a0ecSDave Kleikamp bg = sbi->s_desc_per_block * nr; 1582617ba13bSMingming Cao if (ext4_bg_has_super(sb, bg)) 1583ac27a0ecSDave Kleikamp has_super = 1; 1584617ba13bSMingming Cao return (has_super + ext4_group_first_block_no(sb, bg)); 1585ac27a0ecSDave Kleikamp } 1586ac27a0ecSDave Kleikamp 1587ac27a0ecSDave Kleikamp 1588617ba13bSMingming Cao static int ext4_fill_super (struct super_block *sb, void *data, int silent) 1589ac27a0ecSDave Kleikamp { 1590ac27a0ecSDave Kleikamp struct buffer_head * bh; 1591617ba13bSMingming Cao struct ext4_super_block *es = NULL; 1592617ba13bSMingming Cao struct ext4_sb_info *sbi; 1593617ba13bSMingming Cao ext4_fsblk_t block; 1594617ba13bSMingming Cao ext4_fsblk_t sb_block = get_sb_block(&data); 159570bbb3e0SAndrew Morton ext4_fsblk_t logical_sb_block; 1596ac27a0ecSDave Kleikamp unsigned long offset = 0; 1597ac27a0ecSDave Kleikamp unsigned int journal_inum = 0; 1598ac27a0ecSDave Kleikamp unsigned long journal_devnum = 0; 1599ac27a0ecSDave Kleikamp unsigned long def_mount_opts; 1600ac27a0ecSDave Kleikamp struct inode *root; 1601ac27a0ecSDave Kleikamp int blocksize; 1602ac27a0ecSDave Kleikamp int hblock; 1603ac27a0ecSDave Kleikamp int db_count; 1604ac27a0ecSDave Kleikamp int i; 1605ac27a0ecSDave Kleikamp int needs_recovery; 1606ac27a0ecSDave Kleikamp __le32 features; 1607bd81d8eeSLaurent Vivier __u64 blocks_count; 1608833f4077SPeter Zijlstra int err; 1609ac27a0ecSDave Kleikamp 1610ac27a0ecSDave Kleikamp sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 1611ac27a0ecSDave Kleikamp if (!sbi) 1612ac27a0ecSDave Kleikamp return -ENOMEM; 1613ac27a0ecSDave Kleikamp sb->s_fs_info = sbi; 1614ac27a0ecSDave Kleikamp sbi->s_mount_opt = 0; 1615617ba13bSMingming Cao sbi->s_resuid = EXT4_DEF_RESUID; 1616617ba13bSMingming Cao sbi->s_resgid = EXT4_DEF_RESGID; 1617d9c9bef1SMiklos Szeredi sbi->s_sb_block = sb_block; 1618ac27a0ecSDave Kleikamp 1619ac27a0ecSDave Kleikamp unlock_kernel(); 1620ac27a0ecSDave Kleikamp 1621617ba13bSMingming Cao blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); 1622ac27a0ecSDave Kleikamp if (!blocksize) { 1623617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: unable to set blocksize\n"); 1624ac27a0ecSDave Kleikamp goto out_fail; 1625ac27a0ecSDave Kleikamp } 1626ac27a0ecSDave Kleikamp 1627ac27a0ecSDave Kleikamp /* 1628617ba13bSMingming Cao * The ext4 superblock will not be buffer aligned for other than 1kB 1629ac27a0ecSDave Kleikamp * block sizes. We need to calculate the offset from buffer start. 1630ac27a0ecSDave Kleikamp */ 1631617ba13bSMingming Cao if (blocksize != EXT4_MIN_BLOCK_SIZE) { 163270bbb3e0SAndrew Morton logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 163370bbb3e0SAndrew Morton offset = do_div(logical_sb_block, blocksize); 1634ac27a0ecSDave Kleikamp } else { 163570bbb3e0SAndrew Morton logical_sb_block = sb_block; 1636ac27a0ecSDave Kleikamp } 1637ac27a0ecSDave Kleikamp 163870bbb3e0SAndrew Morton if (!(bh = sb_bread(sb, logical_sb_block))) { 1639617ba13bSMingming Cao printk (KERN_ERR "EXT4-fs: unable to read superblock\n"); 1640ac27a0ecSDave Kleikamp goto out_fail; 1641ac27a0ecSDave Kleikamp } 1642ac27a0ecSDave Kleikamp /* 1643ac27a0ecSDave Kleikamp * Note: s_es must be initialized as soon as possible because 1644617ba13bSMingming Cao * some ext4 macro-instructions depend on its value 1645ac27a0ecSDave Kleikamp */ 1646617ba13bSMingming Cao es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 1647ac27a0ecSDave Kleikamp sbi->s_es = es; 1648ac27a0ecSDave Kleikamp sb->s_magic = le16_to_cpu(es->s_magic); 1649617ba13bSMingming Cao if (sb->s_magic != EXT4_SUPER_MAGIC) 1650617ba13bSMingming Cao goto cantfind_ext4; 1651ac27a0ecSDave Kleikamp 1652ac27a0ecSDave Kleikamp /* Set defaults before we parse the mount options */ 1653ac27a0ecSDave Kleikamp def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 1654617ba13bSMingming Cao if (def_mount_opts & EXT4_DEFM_DEBUG) 1655ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, DEBUG); 1656617ba13bSMingming Cao if (def_mount_opts & EXT4_DEFM_BSDGROUPS) 1657ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, GRPID); 1658617ba13bSMingming Cao if (def_mount_opts & EXT4_DEFM_UID16) 1659ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, NO_UID32); 16602e7842b8SHugh Dickins #ifdef CONFIG_EXT4DEV_FS_XATTR 1661617ba13bSMingming Cao if (def_mount_opts & EXT4_DEFM_XATTR_USER) 1662ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, XATTR_USER); 16632e7842b8SHugh Dickins #endif 16642e7842b8SHugh Dickins #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 1665617ba13bSMingming Cao if (def_mount_opts & EXT4_DEFM_ACL) 1666ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, POSIX_ACL); 16672e7842b8SHugh Dickins #endif 1668617ba13bSMingming Cao if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) 1669617ba13bSMingming Cao sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA; 1670617ba13bSMingming Cao else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) 1671617ba13bSMingming Cao sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA; 1672617ba13bSMingming Cao else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) 1673617ba13bSMingming Cao sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA; 1674ac27a0ecSDave Kleikamp 1675617ba13bSMingming Cao if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) 1676ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, ERRORS_PANIC); 1677617ba13bSMingming Cao else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_RO) 1678ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, ERRORS_RO); 1679ceea16bfSDmitry Mishin else 1680ceea16bfSDmitry Mishin set_opt(sbi->s_mount_opt, ERRORS_CONT); 1681ac27a0ecSDave Kleikamp 1682ac27a0ecSDave Kleikamp sbi->s_resuid = le16_to_cpu(es->s_def_resuid); 1683ac27a0ecSDave Kleikamp sbi->s_resgid = le16_to_cpu(es->s_def_resgid); 1684ac27a0ecSDave Kleikamp 1685ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, RESERVATION); 1686ac27a0ecSDave Kleikamp 16871e2462f9SMingming Cao /* 16881e2462f9SMingming Cao * turn on extents feature by default in ext4 filesystem 16891e2462f9SMingming Cao * User -o noextents to turn it off 16901e2462f9SMingming Cao */ 16911e2462f9SMingming Cao set_opt(sbi->s_mount_opt, EXTENTS); 16921e2462f9SMingming Cao 1693ac27a0ecSDave Kleikamp if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum, 1694ac27a0ecSDave Kleikamp NULL, 0)) 1695ac27a0ecSDave Kleikamp goto failed_mount; 1696ac27a0ecSDave Kleikamp 1697ac27a0ecSDave Kleikamp sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 1698617ba13bSMingming Cao ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 1699ac27a0ecSDave Kleikamp 1700617ba13bSMingming Cao if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && 1701617ba13bSMingming Cao (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || 1702617ba13bSMingming Cao EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 1703617ba13bSMingming Cao EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) 1704ac27a0ecSDave Kleikamp printk(KERN_WARNING 1705617ba13bSMingming Cao "EXT4-fs warning: feature flags set on rev 0 fs, " 1706ac27a0ecSDave Kleikamp "running e2fsck is recommended\n"); 1707ac27a0ecSDave Kleikamp /* 1708ac27a0ecSDave Kleikamp * Check feature flags regardless of the revision level, since we 1709ac27a0ecSDave Kleikamp * previously didn't change the revision level when setting the flags, 1710ac27a0ecSDave Kleikamp * so there is a chance incompat flags are set on a rev 0 filesystem. 1711ac27a0ecSDave Kleikamp */ 1712617ba13bSMingming Cao features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP); 1713ac27a0ecSDave Kleikamp if (features) { 1714617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of " 1715ac27a0ecSDave Kleikamp "unsupported optional features (%x).\n", 1716ac27a0ecSDave Kleikamp sb->s_id, le32_to_cpu(features)); 1717ac27a0ecSDave Kleikamp goto failed_mount; 1718ac27a0ecSDave Kleikamp } 1719617ba13bSMingming Cao features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP); 1720ac27a0ecSDave Kleikamp if (!(sb->s_flags & MS_RDONLY) && features) { 1721617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of " 1722ac27a0ecSDave Kleikamp "unsupported optional features (%x).\n", 1723ac27a0ecSDave Kleikamp sb->s_id, le32_to_cpu(features)); 1724ac27a0ecSDave Kleikamp goto failed_mount; 1725ac27a0ecSDave Kleikamp } 1726ac27a0ecSDave Kleikamp blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); 1727ac27a0ecSDave Kleikamp 1728617ba13bSMingming Cao if (blocksize < EXT4_MIN_BLOCK_SIZE || 1729617ba13bSMingming Cao blocksize > EXT4_MAX_BLOCK_SIZE) { 1730ac27a0ecSDave Kleikamp printk(KERN_ERR 1731617ba13bSMingming Cao "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n", 1732ac27a0ecSDave Kleikamp blocksize, sb->s_id); 1733ac27a0ecSDave Kleikamp goto failed_mount; 1734ac27a0ecSDave Kleikamp } 1735ac27a0ecSDave Kleikamp 1736ac27a0ecSDave Kleikamp hblock = bdev_hardsect_size(sb->s_bdev); 1737ac27a0ecSDave Kleikamp if (sb->s_blocksize != blocksize) { 1738ac27a0ecSDave Kleikamp /* 1739ac27a0ecSDave Kleikamp * Make sure the blocksize for the filesystem is larger 1740ac27a0ecSDave Kleikamp * than the hardware sectorsize for the machine. 1741ac27a0ecSDave Kleikamp */ 1742ac27a0ecSDave Kleikamp if (blocksize < hblock) { 1743617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: blocksize %d too small for " 1744ac27a0ecSDave Kleikamp "device blocksize %d.\n", blocksize, hblock); 1745ac27a0ecSDave Kleikamp goto failed_mount; 1746ac27a0ecSDave Kleikamp } 1747ac27a0ecSDave Kleikamp 1748ac27a0ecSDave Kleikamp brelse (bh); 1749ac27a0ecSDave Kleikamp sb_set_blocksize(sb, blocksize); 175070bbb3e0SAndrew Morton logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 175170bbb3e0SAndrew Morton offset = do_div(logical_sb_block, blocksize); 175270bbb3e0SAndrew Morton bh = sb_bread(sb, logical_sb_block); 1753ac27a0ecSDave Kleikamp if (!bh) { 1754ac27a0ecSDave Kleikamp printk(KERN_ERR 1755617ba13bSMingming Cao "EXT4-fs: Can't read superblock on 2nd try.\n"); 1756ac27a0ecSDave Kleikamp goto failed_mount; 1757ac27a0ecSDave Kleikamp } 1758617ba13bSMingming Cao es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); 1759ac27a0ecSDave Kleikamp sbi->s_es = es; 1760617ba13bSMingming Cao if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { 1761ac27a0ecSDave Kleikamp printk (KERN_ERR 1762617ba13bSMingming Cao "EXT4-fs: Magic mismatch, very weird !\n"); 1763ac27a0ecSDave Kleikamp goto failed_mount; 1764ac27a0ecSDave Kleikamp } 1765ac27a0ecSDave Kleikamp } 1766ac27a0ecSDave Kleikamp 1767617ba13bSMingming Cao sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits); 1768ac27a0ecSDave Kleikamp 1769617ba13bSMingming Cao if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { 1770617ba13bSMingming Cao sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; 1771617ba13bSMingming Cao sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; 1772ac27a0ecSDave Kleikamp } else { 1773ac27a0ecSDave Kleikamp sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 1774ac27a0ecSDave Kleikamp sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 1775617ba13bSMingming Cao if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || 17761330593eSVignesh Babu (!is_power_of_2(sbi->s_inode_size)) || 1777ac27a0ecSDave Kleikamp (sbi->s_inode_size > blocksize)) { 1778ac27a0ecSDave Kleikamp printk (KERN_ERR 1779617ba13bSMingming Cao "EXT4-fs: unsupported inode size: %d\n", 1780ac27a0ecSDave Kleikamp sbi->s_inode_size); 1781ac27a0ecSDave Kleikamp goto failed_mount; 1782ac27a0ecSDave Kleikamp } 1783ef7f3835SKalpak Shah if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) 1784ef7f3835SKalpak Shah sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); 1785ac27a0ecSDave Kleikamp } 17860d1ee42fSAlexandre Ratchov sbi->s_desc_size = le16_to_cpu(es->s_desc_size); 17870d1ee42fSAlexandre Ratchov if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { 17888fadc143SAlexandre Ratchov if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || 17890d1ee42fSAlexandre Ratchov sbi->s_desc_size > EXT4_MAX_DESC_SIZE || 1790d8ea6cf8Svignesh babu !is_power_of_2(sbi->s_desc_size)) { 17910d1ee42fSAlexandre Ratchov printk(KERN_ERR 17928fadc143SAlexandre Ratchov "EXT4-fs: unsupported descriptor size %lu\n", 17930d1ee42fSAlexandre Ratchov sbi->s_desc_size); 17940d1ee42fSAlexandre Ratchov goto failed_mount; 17950d1ee42fSAlexandre Ratchov } 17960d1ee42fSAlexandre Ratchov } else 17970d1ee42fSAlexandre Ratchov sbi->s_desc_size = EXT4_MIN_DESC_SIZE; 1798ac27a0ecSDave Kleikamp sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 1799ac27a0ecSDave Kleikamp sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 1800617ba13bSMingming Cao if (EXT4_INODE_SIZE(sb) == 0) 1801617ba13bSMingming Cao goto cantfind_ext4; 1802617ba13bSMingming Cao sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); 1803ac27a0ecSDave Kleikamp if (sbi->s_inodes_per_block == 0) 1804617ba13bSMingming Cao goto cantfind_ext4; 1805ac27a0ecSDave Kleikamp sbi->s_itb_per_group = sbi->s_inodes_per_group / 1806ac27a0ecSDave Kleikamp sbi->s_inodes_per_block; 18070d1ee42fSAlexandre Ratchov sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); 1808ac27a0ecSDave Kleikamp sbi->s_sbh = bh; 1809ac27a0ecSDave Kleikamp sbi->s_mount_state = le16_to_cpu(es->s_state); 1810e57aa839SFengguang Wu sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); 1811e57aa839SFengguang Wu sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); 1812ac27a0ecSDave Kleikamp for (i=0; i < 4; i++) 1813ac27a0ecSDave Kleikamp sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); 1814ac27a0ecSDave Kleikamp sbi->s_def_hash_version = es->s_def_hash_version; 1815ac27a0ecSDave Kleikamp 1816ac27a0ecSDave Kleikamp if (sbi->s_blocks_per_group > blocksize * 8) { 1817ac27a0ecSDave Kleikamp printk (KERN_ERR 1818617ba13bSMingming Cao "EXT4-fs: #blocks per group too big: %lu\n", 1819ac27a0ecSDave Kleikamp sbi->s_blocks_per_group); 1820ac27a0ecSDave Kleikamp goto failed_mount; 1821ac27a0ecSDave Kleikamp } 1822ac27a0ecSDave Kleikamp if (sbi->s_inodes_per_group > blocksize * 8) { 1823ac27a0ecSDave Kleikamp printk (KERN_ERR 1824617ba13bSMingming Cao "EXT4-fs: #inodes per group too big: %lu\n", 1825ac27a0ecSDave Kleikamp sbi->s_inodes_per_group); 1826ac27a0ecSDave Kleikamp goto failed_mount; 1827ac27a0ecSDave Kleikamp } 1828ac27a0ecSDave Kleikamp 1829bd81d8eeSLaurent Vivier if (ext4_blocks_count(es) > 1830ac27a0ecSDave Kleikamp (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { 1831617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: filesystem on %s:" 1832ac27a0ecSDave Kleikamp " too large to mount safely\n", sb->s_id); 1833ac27a0ecSDave Kleikamp if (sizeof(sector_t) < 8) 1834617ba13bSMingming Cao printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not " 1835ac27a0ecSDave Kleikamp "enabled\n"); 1836ac27a0ecSDave Kleikamp goto failed_mount; 1837ac27a0ecSDave Kleikamp } 1838ac27a0ecSDave Kleikamp 1839617ba13bSMingming Cao if (EXT4_BLOCKS_PER_GROUP(sb) == 0) 1840617ba13bSMingming Cao goto cantfind_ext4; 1841bd81d8eeSLaurent Vivier blocks_count = (ext4_blocks_count(es) - 1842bd81d8eeSLaurent Vivier le32_to_cpu(es->s_first_data_block) + 1843bd81d8eeSLaurent Vivier EXT4_BLOCKS_PER_GROUP(sb) - 1); 1844bd81d8eeSLaurent Vivier do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); 1845bd81d8eeSLaurent Vivier sbi->s_groups_count = blocks_count; 1846617ba13bSMingming Cao db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / 1847617ba13bSMingming Cao EXT4_DESC_PER_BLOCK(sb); 1848ac27a0ecSDave Kleikamp sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *), 1849ac27a0ecSDave Kleikamp GFP_KERNEL); 1850ac27a0ecSDave Kleikamp if (sbi->s_group_desc == NULL) { 1851617ba13bSMingming Cao printk (KERN_ERR "EXT4-fs: not enough memory\n"); 1852ac27a0ecSDave Kleikamp goto failed_mount; 1853ac27a0ecSDave Kleikamp } 1854ac27a0ecSDave Kleikamp 1855ac27a0ecSDave Kleikamp bgl_lock_init(&sbi->s_blockgroup_lock); 1856ac27a0ecSDave Kleikamp 1857ac27a0ecSDave Kleikamp for (i = 0; i < db_count; i++) { 185870bbb3e0SAndrew Morton block = descriptor_loc(sb, logical_sb_block, i); 1859ac27a0ecSDave Kleikamp sbi->s_group_desc[i] = sb_bread(sb, block); 1860ac27a0ecSDave Kleikamp if (!sbi->s_group_desc[i]) { 1861617ba13bSMingming Cao printk (KERN_ERR "EXT4-fs: " 1862ac27a0ecSDave Kleikamp "can't read group descriptor %d\n", i); 1863ac27a0ecSDave Kleikamp db_count = i; 1864ac27a0ecSDave Kleikamp goto failed_mount2; 1865ac27a0ecSDave Kleikamp } 1866ac27a0ecSDave Kleikamp } 1867617ba13bSMingming Cao if (!ext4_check_descriptors (sb)) { 1868617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n"); 1869ac27a0ecSDave Kleikamp goto failed_mount2; 1870ac27a0ecSDave Kleikamp } 1871ac27a0ecSDave Kleikamp sbi->s_gdb_count = db_count; 1872ac27a0ecSDave Kleikamp get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 1873ac27a0ecSDave Kleikamp spin_lock_init(&sbi->s_next_gen_lock); 1874ac27a0ecSDave Kleikamp 1875833f4077SPeter Zijlstra err = percpu_counter_init(&sbi->s_freeblocks_counter, 1876617ba13bSMingming Cao ext4_count_free_blocks(sb)); 1877833f4077SPeter Zijlstra if (!err) { 1878833f4077SPeter Zijlstra err = percpu_counter_init(&sbi->s_freeinodes_counter, 1879617ba13bSMingming Cao ext4_count_free_inodes(sb)); 1880833f4077SPeter Zijlstra } 1881833f4077SPeter Zijlstra if (!err) { 1882833f4077SPeter Zijlstra err = percpu_counter_init(&sbi->s_dirs_counter, 1883617ba13bSMingming Cao ext4_count_dirs(sb)); 1884833f4077SPeter Zijlstra } 1885833f4077SPeter Zijlstra if (err) { 1886833f4077SPeter Zijlstra printk(KERN_ERR "EXT4-fs: insufficient memory\n"); 1887833f4077SPeter Zijlstra goto failed_mount3; 1888833f4077SPeter Zijlstra } 1889ac27a0ecSDave Kleikamp 1890ac27a0ecSDave Kleikamp /* per fileystem reservation list head & lock */ 1891ac27a0ecSDave Kleikamp spin_lock_init(&sbi->s_rsv_window_lock); 1892ac27a0ecSDave Kleikamp sbi->s_rsv_window_root = RB_ROOT; 1893ac27a0ecSDave Kleikamp /* Add a single, static dummy reservation to the start of the 1894ac27a0ecSDave Kleikamp * reservation window list --- it gives us a placeholder for 1895ac27a0ecSDave Kleikamp * append-at-start-of-list which makes the allocation logic 1896ac27a0ecSDave Kleikamp * _much_ simpler. */ 1897617ba13bSMingming Cao sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; 1898617ba13bSMingming Cao sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; 1899ac27a0ecSDave Kleikamp sbi->s_rsv_window_head.rsv_alloc_hit = 0; 1900ac27a0ecSDave Kleikamp sbi->s_rsv_window_head.rsv_goal_size = 0; 1901617ba13bSMingming Cao ext4_rsv_window_add(sb, &sbi->s_rsv_window_head); 1902ac27a0ecSDave Kleikamp 1903ac27a0ecSDave Kleikamp /* 1904ac27a0ecSDave Kleikamp * set up enough so that it can read an inode 1905ac27a0ecSDave Kleikamp */ 1906617ba13bSMingming Cao sb->s_op = &ext4_sops; 1907617ba13bSMingming Cao sb->s_export_op = &ext4_export_ops; 1908617ba13bSMingming Cao sb->s_xattr = ext4_xattr_handlers; 1909ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 1910617ba13bSMingming Cao sb->s_qcop = &ext4_qctl_operations; 1911617ba13bSMingming Cao sb->dq_op = &ext4_quota_operations; 1912ac27a0ecSDave Kleikamp #endif 1913ac27a0ecSDave Kleikamp INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ 1914ac27a0ecSDave Kleikamp 1915ac27a0ecSDave Kleikamp sb->s_root = NULL; 1916ac27a0ecSDave Kleikamp 1917ac27a0ecSDave Kleikamp needs_recovery = (es->s_last_orphan != 0 || 1918617ba13bSMingming Cao EXT4_HAS_INCOMPAT_FEATURE(sb, 1919617ba13bSMingming Cao EXT4_FEATURE_INCOMPAT_RECOVER)); 1920ac27a0ecSDave Kleikamp 1921ac27a0ecSDave Kleikamp /* 1922ac27a0ecSDave Kleikamp * The first inode we look at is the journal inode. Don't try 1923ac27a0ecSDave Kleikamp * root first: it may be modified in the journal! 1924ac27a0ecSDave Kleikamp */ 1925ac27a0ecSDave Kleikamp if (!test_opt(sb, NOLOAD) && 1926617ba13bSMingming Cao EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 1927617ba13bSMingming Cao if (ext4_load_journal(sb, es, journal_devnum)) 1928ac27a0ecSDave Kleikamp goto failed_mount3; 1929ac27a0ecSDave Kleikamp } else if (journal_inum) { 1930617ba13bSMingming Cao if (ext4_create_journal(sb, es, journal_inum)) 1931ac27a0ecSDave Kleikamp goto failed_mount3; 1932ac27a0ecSDave Kleikamp } else { 1933ac27a0ecSDave Kleikamp if (!silent) 1934ac27a0ecSDave Kleikamp printk (KERN_ERR 1935617ba13bSMingming Cao "ext4: No journal on filesystem on %s\n", 1936ac27a0ecSDave Kleikamp sb->s_id); 1937ac27a0ecSDave Kleikamp goto failed_mount3; 1938ac27a0ecSDave Kleikamp } 1939ac27a0ecSDave Kleikamp 1940eb40a09cSJose R. Santos if (ext4_blocks_count(es) > 0xffffffffULL && 1941eb40a09cSJose R. Santos !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, 1942eb40a09cSJose R. Santos JBD2_FEATURE_INCOMPAT_64BIT)) { 1943eb40a09cSJose R. Santos printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n"); 1944eb40a09cSJose R. Santos goto failed_mount4; 1945eb40a09cSJose R. Santos } 1946eb40a09cSJose R. Santos 1947ac27a0ecSDave Kleikamp /* We have now updated the journal if required, so we can 1948ac27a0ecSDave Kleikamp * validate the data journaling mode. */ 1949ac27a0ecSDave Kleikamp switch (test_opt(sb, DATA_FLAGS)) { 1950ac27a0ecSDave Kleikamp case 0: 1951ac27a0ecSDave Kleikamp /* No mode set, assume a default based on the journal 195263f57933SAndrew Morton * capabilities: ORDERED_DATA if the journal can 195363f57933SAndrew Morton * cope, else JOURNAL_DATA 195463f57933SAndrew Morton */ 1955dab291afSMingming Cao if (jbd2_journal_check_available_features 1956dab291afSMingming Cao (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) 1957ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, ORDERED_DATA); 1958ac27a0ecSDave Kleikamp else 1959ac27a0ecSDave Kleikamp set_opt(sbi->s_mount_opt, JOURNAL_DATA); 1960ac27a0ecSDave Kleikamp break; 1961ac27a0ecSDave Kleikamp 1962617ba13bSMingming Cao case EXT4_MOUNT_ORDERED_DATA: 1963617ba13bSMingming Cao case EXT4_MOUNT_WRITEBACK_DATA: 1964dab291afSMingming Cao if (!jbd2_journal_check_available_features 1965dab291afSMingming Cao (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { 1966617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: Journal does not support " 1967ac27a0ecSDave Kleikamp "requested data journaling mode\n"); 1968ac27a0ecSDave Kleikamp goto failed_mount4; 1969ac27a0ecSDave Kleikamp } 1970ac27a0ecSDave Kleikamp default: 1971ac27a0ecSDave Kleikamp break; 1972ac27a0ecSDave Kleikamp } 1973ac27a0ecSDave Kleikamp 1974ac27a0ecSDave Kleikamp if (test_opt(sb, NOBH)) { 1975617ba13bSMingming Cao if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) { 1976617ba13bSMingming Cao printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - " 1977ac27a0ecSDave Kleikamp "its supported only with writeback mode\n"); 1978ac27a0ecSDave Kleikamp clear_opt(sbi->s_mount_opt, NOBH); 1979ac27a0ecSDave Kleikamp } 1980ac27a0ecSDave Kleikamp } 1981ac27a0ecSDave Kleikamp /* 1982dab291afSMingming Cao * The jbd2_journal_load will have done any necessary log recovery, 1983ac27a0ecSDave Kleikamp * so we can safely mount the rest of the filesystem now. 1984ac27a0ecSDave Kleikamp */ 1985ac27a0ecSDave Kleikamp 1986617ba13bSMingming Cao root = iget(sb, EXT4_ROOT_INO); 1987ac27a0ecSDave Kleikamp sb->s_root = d_alloc_root(root); 1988ac27a0ecSDave Kleikamp if (!sb->s_root) { 1989617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: get root inode failed\n"); 1990ac27a0ecSDave Kleikamp iput(root); 1991ac27a0ecSDave Kleikamp goto failed_mount4; 1992ac27a0ecSDave Kleikamp } 1993ac27a0ecSDave Kleikamp if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 1994ac27a0ecSDave Kleikamp dput(sb->s_root); 1995ac27a0ecSDave Kleikamp sb->s_root = NULL; 1996617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n"); 1997ac27a0ecSDave Kleikamp goto failed_mount4; 1998ac27a0ecSDave Kleikamp } 1999ac27a0ecSDave Kleikamp 2000617ba13bSMingming Cao ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY); 2001ef7f3835SKalpak Shah 2002ef7f3835SKalpak Shah /* determine the minimum size of new large inodes, if present */ 2003ef7f3835SKalpak Shah if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { 2004ef7f3835SKalpak Shah sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 2005ef7f3835SKalpak Shah EXT4_GOOD_OLD_INODE_SIZE; 2006ef7f3835SKalpak Shah if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 2007ef7f3835SKalpak Shah EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { 2008ef7f3835SKalpak Shah if (sbi->s_want_extra_isize < 2009ef7f3835SKalpak Shah le16_to_cpu(es->s_want_extra_isize)) 2010ef7f3835SKalpak Shah sbi->s_want_extra_isize = 2011ef7f3835SKalpak Shah le16_to_cpu(es->s_want_extra_isize); 2012ef7f3835SKalpak Shah if (sbi->s_want_extra_isize < 2013ef7f3835SKalpak Shah le16_to_cpu(es->s_min_extra_isize)) 2014ef7f3835SKalpak Shah sbi->s_want_extra_isize = 2015ef7f3835SKalpak Shah le16_to_cpu(es->s_min_extra_isize); 2016ef7f3835SKalpak Shah } 2017ef7f3835SKalpak Shah } 2018ef7f3835SKalpak Shah /* Check if enough inode space is available */ 2019ef7f3835SKalpak Shah if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > 2020ef7f3835SKalpak Shah sbi->s_inode_size) { 2021ef7f3835SKalpak Shah sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 2022ef7f3835SKalpak Shah EXT4_GOOD_OLD_INODE_SIZE; 2023ef7f3835SKalpak Shah printk(KERN_INFO "EXT4-fs: required extra inode space not" 2024ef7f3835SKalpak Shah "available.\n"); 2025ef7f3835SKalpak Shah } 2026ef7f3835SKalpak Shah 2027ac27a0ecSDave Kleikamp /* 2028ac27a0ecSDave Kleikamp * akpm: core read_super() calls in here with the superblock locked. 2029ac27a0ecSDave Kleikamp * That deadlocks, because orphan cleanup needs to lock the superblock 2030ac27a0ecSDave Kleikamp * in numerous places. Here we just pop the lock - it's relatively 2031ac27a0ecSDave Kleikamp * harmless, because we are now ready to accept write_super() requests, 2032ac27a0ecSDave Kleikamp * and aviro says that's the only reason for hanging onto the 2033ac27a0ecSDave Kleikamp * superblock lock. 2034ac27a0ecSDave Kleikamp */ 2035617ba13bSMingming Cao EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; 2036617ba13bSMingming Cao ext4_orphan_cleanup(sb, es); 2037617ba13bSMingming Cao EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; 2038ac27a0ecSDave Kleikamp if (needs_recovery) 2039617ba13bSMingming Cao printk (KERN_INFO "EXT4-fs: recovery complete.\n"); 2040617ba13bSMingming Cao ext4_mark_recovery_complete(sb, es); 2041617ba13bSMingming Cao printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n", 2042617ba13bSMingming Cao test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal": 2043617ba13bSMingming Cao test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered": 2044ac27a0ecSDave Kleikamp "writeback"); 2045ac27a0ecSDave Kleikamp 2046a86c6181SAlex Tomas ext4_ext_init(sb); 2047a86c6181SAlex Tomas 2048ac27a0ecSDave Kleikamp lock_kernel(); 2049ac27a0ecSDave Kleikamp return 0; 2050ac27a0ecSDave Kleikamp 2051617ba13bSMingming Cao cantfind_ext4: 2052ac27a0ecSDave Kleikamp if (!silent) 2053617ba13bSMingming Cao printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n", 2054ac27a0ecSDave Kleikamp sb->s_id); 2055ac27a0ecSDave Kleikamp goto failed_mount; 2056ac27a0ecSDave Kleikamp 2057ac27a0ecSDave Kleikamp failed_mount4: 2058dab291afSMingming Cao jbd2_journal_destroy(sbi->s_journal); 2059ac27a0ecSDave Kleikamp failed_mount3: 2060ac27a0ecSDave Kleikamp percpu_counter_destroy(&sbi->s_freeblocks_counter); 2061ac27a0ecSDave Kleikamp percpu_counter_destroy(&sbi->s_freeinodes_counter); 2062ac27a0ecSDave Kleikamp percpu_counter_destroy(&sbi->s_dirs_counter); 2063ac27a0ecSDave Kleikamp failed_mount2: 2064ac27a0ecSDave Kleikamp for (i = 0; i < db_count; i++) 2065ac27a0ecSDave Kleikamp brelse(sbi->s_group_desc[i]); 2066ac27a0ecSDave Kleikamp kfree(sbi->s_group_desc); 2067ac27a0ecSDave Kleikamp failed_mount: 2068ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 2069ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) 2070ac27a0ecSDave Kleikamp kfree(sbi->s_qf_names[i]); 2071ac27a0ecSDave Kleikamp #endif 2072617ba13bSMingming Cao ext4_blkdev_remove(sbi); 2073ac27a0ecSDave Kleikamp brelse(bh); 2074ac27a0ecSDave Kleikamp out_fail: 2075ac27a0ecSDave Kleikamp sb->s_fs_info = NULL; 2076ac27a0ecSDave Kleikamp kfree(sbi); 2077ac27a0ecSDave Kleikamp lock_kernel(); 2078ac27a0ecSDave Kleikamp return -EINVAL; 2079ac27a0ecSDave Kleikamp } 2080ac27a0ecSDave Kleikamp 2081ac27a0ecSDave Kleikamp /* 2082ac27a0ecSDave Kleikamp * Setup any per-fs journal parameters now. We'll do this both on 2083ac27a0ecSDave Kleikamp * initial mount, once the journal has been initialised but before we've 2084ac27a0ecSDave Kleikamp * done any recovery; and again on any subsequent remount. 2085ac27a0ecSDave Kleikamp */ 2086617ba13bSMingming Cao static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) 2087ac27a0ecSDave Kleikamp { 2088617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 2089ac27a0ecSDave Kleikamp 2090ac27a0ecSDave Kleikamp if (sbi->s_commit_interval) 2091ac27a0ecSDave Kleikamp journal->j_commit_interval = sbi->s_commit_interval; 2092617ba13bSMingming Cao /* We could also set up an ext4-specific default for the commit 2093ac27a0ecSDave Kleikamp * interval here, but for now we'll just fall back to the jbd 2094ac27a0ecSDave Kleikamp * default. */ 2095ac27a0ecSDave Kleikamp 2096ac27a0ecSDave Kleikamp spin_lock(&journal->j_state_lock); 2097ac27a0ecSDave Kleikamp if (test_opt(sb, BARRIER)) 2098dab291afSMingming Cao journal->j_flags |= JBD2_BARRIER; 2099ac27a0ecSDave Kleikamp else 2100dab291afSMingming Cao journal->j_flags &= ~JBD2_BARRIER; 2101ac27a0ecSDave Kleikamp spin_unlock(&journal->j_state_lock); 2102ac27a0ecSDave Kleikamp } 2103ac27a0ecSDave Kleikamp 2104617ba13bSMingming Cao static journal_t *ext4_get_journal(struct super_block *sb, 2105ac27a0ecSDave Kleikamp unsigned int journal_inum) 2106ac27a0ecSDave Kleikamp { 2107ac27a0ecSDave Kleikamp struct inode *journal_inode; 2108ac27a0ecSDave Kleikamp journal_t *journal; 2109ac27a0ecSDave Kleikamp 2110ac27a0ecSDave Kleikamp /* First, test for the existence of a valid inode on disk. Bad 2111ac27a0ecSDave Kleikamp * things happen if we iget() an unused inode, as the subsequent 2112ac27a0ecSDave Kleikamp * iput() will try to delete it. */ 2113ac27a0ecSDave Kleikamp 2114ac27a0ecSDave Kleikamp journal_inode = iget(sb, journal_inum); 2115ac27a0ecSDave Kleikamp if (!journal_inode) { 2116617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: no journal found.\n"); 2117ac27a0ecSDave Kleikamp return NULL; 2118ac27a0ecSDave Kleikamp } 2119ac27a0ecSDave Kleikamp if (!journal_inode->i_nlink) { 2120ac27a0ecSDave Kleikamp make_bad_inode(journal_inode); 2121ac27a0ecSDave Kleikamp iput(journal_inode); 2122617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n"); 2123ac27a0ecSDave Kleikamp return NULL; 2124ac27a0ecSDave Kleikamp } 2125ac27a0ecSDave Kleikamp 2126ac27a0ecSDave Kleikamp jbd_debug(2, "Journal inode found at %p: %Ld bytes\n", 2127ac27a0ecSDave Kleikamp journal_inode, journal_inode->i_size); 2128ac27a0ecSDave Kleikamp if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) { 2129617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: invalid journal inode.\n"); 2130ac27a0ecSDave Kleikamp iput(journal_inode); 2131ac27a0ecSDave Kleikamp return NULL; 2132ac27a0ecSDave Kleikamp } 2133ac27a0ecSDave Kleikamp 2134dab291afSMingming Cao journal = jbd2_journal_init_inode(journal_inode); 2135ac27a0ecSDave Kleikamp if (!journal) { 2136617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: Could not load journal inode\n"); 2137ac27a0ecSDave Kleikamp iput(journal_inode); 2138ac27a0ecSDave Kleikamp return NULL; 2139ac27a0ecSDave Kleikamp } 2140ac27a0ecSDave Kleikamp journal->j_private = sb; 2141617ba13bSMingming Cao ext4_init_journal_params(sb, journal); 2142ac27a0ecSDave Kleikamp return journal; 2143ac27a0ecSDave Kleikamp } 2144ac27a0ecSDave Kleikamp 2145617ba13bSMingming Cao static journal_t *ext4_get_dev_journal(struct super_block *sb, 2146ac27a0ecSDave Kleikamp dev_t j_dev) 2147ac27a0ecSDave Kleikamp { 2148ac27a0ecSDave Kleikamp struct buffer_head * bh; 2149ac27a0ecSDave Kleikamp journal_t *journal; 2150617ba13bSMingming Cao ext4_fsblk_t start; 2151617ba13bSMingming Cao ext4_fsblk_t len; 2152ac27a0ecSDave Kleikamp int hblock, blocksize; 2153617ba13bSMingming Cao ext4_fsblk_t sb_block; 2154ac27a0ecSDave Kleikamp unsigned long offset; 2155617ba13bSMingming Cao struct ext4_super_block * es; 2156ac27a0ecSDave Kleikamp struct block_device *bdev; 2157ac27a0ecSDave Kleikamp 2158617ba13bSMingming Cao bdev = ext4_blkdev_get(j_dev); 2159ac27a0ecSDave Kleikamp if (bdev == NULL) 2160ac27a0ecSDave Kleikamp return NULL; 2161ac27a0ecSDave Kleikamp 2162ac27a0ecSDave Kleikamp if (bd_claim(bdev, sb)) { 2163ac27a0ecSDave Kleikamp printk(KERN_ERR 2164617ba13bSMingming Cao "EXT4: failed to claim external journal device.\n"); 2165ac27a0ecSDave Kleikamp blkdev_put(bdev); 2166ac27a0ecSDave Kleikamp return NULL; 2167ac27a0ecSDave Kleikamp } 2168ac27a0ecSDave Kleikamp 2169ac27a0ecSDave Kleikamp blocksize = sb->s_blocksize; 2170ac27a0ecSDave Kleikamp hblock = bdev_hardsect_size(bdev); 2171ac27a0ecSDave Kleikamp if (blocksize < hblock) { 2172ac27a0ecSDave Kleikamp printk(KERN_ERR 2173617ba13bSMingming Cao "EXT4-fs: blocksize too small for journal device.\n"); 2174ac27a0ecSDave Kleikamp goto out_bdev; 2175ac27a0ecSDave Kleikamp } 2176ac27a0ecSDave Kleikamp 2177617ba13bSMingming Cao sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; 2178617ba13bSMingming Cao offset = EXT4_MIN_BLOCK_SIZE % blocksize; 2179ac27a0ecSDave Kleikamp set_blocksize(bdev, blocksize); 2180ac27a0ecSDave Kleikamp if (!(bh = __bread(bdev, sb_block, blocksize))) { 2181617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: couldn't read superblock of " 2182ac27a0ecSDave Kleikamp "external journal\n"); 2183ac27a0ecSDave Kleikamp goto out_bdev; 2184ac27a0ecSDave Kleikamp } 2185ac27a0ecSDave Kleikamp 2186617ba13bSMingming Cao es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 2187617ba13bSMingming Cao if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || 2188ac27a0ecSDave Kleikamp !(le32_to_cpu(es->s_feature_incompat) & 2189617ba13bSMingming Cao EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { 2190617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: external journal has " 2191ac27a0ecSDave Kleikamp "bad superblock\n"); 2192ac27a0ecSDave Kleikamp brelse(bh); 2193ac27a0ecSDave Kleikamp goto out_bdev; 2194ac27a0ecSDave Kleikamp } 2195ac27a0ecSDave Kleikamp 2196617ba13bSMingming Cao if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { 2197617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: journal UUID does not match\n"); 2198ac27a0ecSDave Kleikamp brelse(bh); 2199ac27a0ecSDave Kleikamp goto out_bdev; 2200ac27a0ecSDave Kleikamp } 2201ac27a0ecSDave Kleikamp 2202bd81d8eeSLaurent Vivier len = ext4_blocks_count(es); 2203ac27a0ecSDave Kleikamp start = sb_block + 1; 2204ac27a0ecSDave Kleikamp brelse(bh); /* we're done with the superblock */ 2205ac27a0ecSDave Kleikamp 2206dab291afSMingming Cao journal = jbd2_journal_init_dev(bdev, sb->s_bdev, 2207ac27a0ecSDave Kleikamp start, len, blocksize); 2208ac27a0ecSDave Kleikamp if (!journal) { 2209617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: failed to create device journal\n"); 2210ac27a0ecSDave Kleikamp goto out_bdev; 2211ac27a0ecSDave Kleikamp } 2212ac27a0ecSDave Kleikamp journal->j_private = sb; 2213ac27a0ecSDave Kleikamp ll_rw_block(READ, 1, &journal->j_sb_buffer); 2214ac27a0ecSDave Kleikamp wait_on_buffer(journal->j_sb_buffer); 2215ac27a0ecSDave Kleikamp if (!buffer_uptodate(journal->j_sb_buffer)) { 2216617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: I/O error on journal device\n"); 2217ac27a0ecSDave Kleikamp goto out_journal; 2218ac27a0ecSDave Kleikamp } 2219ac27a0ecSDave Kleikamp if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { 2220617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: External journal has more than one " 2221ac27a0ecSDave Kleikamp "user (unsupported) - %d\n", 2222ac27a0ecSDave Kleikamp be32_to_cpu(journal->j_superblock->s_nr_users)); 2223ac27a0ecSDave Kleikamp goto out_journal; 2224ac27a0ecSDave Kleikamp } 2225617ba13bSMingming Cao EXT4_SB(sb)->journal_bdev = bdev; 2226617ba13bSMingming Cao ext4_init_journal_params(sb, journal); 2227ac27a0ecSDave Kleikamp return journal; 2228ac27a0ecSDave Kleikamp out_journal: 2229dab291afSMingming Cao jbd2_journal_destroy(journal); 2230ac27a0ecSDave Kleikamp out_bdev: 2231617ba13bSMingming Cao ext4_blkdev_put(bdev); 2232ac27a0ecSDave Kleikamp return NULL; 2233ac27a0ecSDave Kleikamp } 2234ac27a0ecSDave Kleikamp 2235617ba13bSMingming Cao static int ext4_load_journal(struct super_block *sb, 2236617ba13bSMingming Cao struct ext4_super_block *es, 2237ac27a0ecSDave Kleikamp unsigned long journal_devnum) 2238ac27a0ecSDave Kleikamp { 2239ac27a0ecSDave Kleikamp journal_t *journal; 2240ac27a0ecSDave Kleikamp unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); 2241ac27a0ecSDave Kleikamp dev_t journal_dev; 2242ac27a0ecSDave Kleikamp int err = 0; 2243ac27a0ecSDave Kleikamp int really_read_only; 2244ac27a0ecSDave Kleikamp 2245ac27a0ecSDave Kleikamp if (journal_devnum && 2246ac27a0ecSDave Kleikamp journal_devnum != le32_to_cpu(es->s_journal_dev)) { 2247617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: external journal device major/minor " 2248ac27a0ecSDave Kleikamp "numbers have changed\n"); 2249ac27a0ecSDave Kleikamp journal_dev = new_decode_dev(journal_devnum); 2250ac27a0ecSDave Kleikamp } else 2251ac27a0ecSDave Kleikamp journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); 2252ac27a0ecSDave Kleikamp 2253ac27a0ecSDave Kleikamp really_read_only = bdev_read_only(sb->s_bdev); 2254ac27a0ecSDave Kleikamp 2255ac27a0ecSDave Kleikamp /* 2256ac27a0ecSDave Kleikamp * Are we loading a blank journal or performing recovery after a 2257ac27a0ecSDave Kleikamp * crash? For recovery, we need to check in advance whether we 2258ac27a0ecSDave Kleikamp * can get read-write access to the device. 2259ac27a0ecSDave Kleikamp */ 2260ac27a0ecSDave Kleikamp 2261617ba13bSMingming Cao if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 2262ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) { 2263617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: INFO: recovery " 2264ac27a0ecSDave Kleikamp "required on readonly filesystem.\n"); 2265ac27a0ecSDave Kleikamp if (really_read_only) { 2266617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: write access " 2267ac27a0ecSDave Kleikamp "unavailable, cannot proceed.\n"); 2268ac27a0ecSDave Kleikamp return -EROFS; 2269ac27a0ecSDave Kleikamp } 2270617ba13bSMingming Cao printk (KERN_INFO "EXT4-fs: write access will " 2271ac27a0ecSDave Kleikamp "be enabled during recovery.\n"); 2272ac27a0ecSDave Kleikamp } 2273ac27a0ecSDave Kleikamp } 2274ac27a0ecSDave Kleikamp 2275ac27a0ecSDave Kleikamp if (journal_inum && journal_dev) { 2276617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: filesystem has both journal " 2277ac27a0ecSDave Kleikamp "and inode journals!\n"); 2278ac27a0ecSDave Kleikamp return -EINVAL; 2279ac27a0ecSDave Kleikamp } 2280ac27a0ecSDave Kleikamp 2281ac27a0ecSDave Kleikamp if (journal_inum) { 2282617ba13bSMingming Cao if (!(journal = ext4_get_journal(sb, journal_inum))) 2283ac27a0ecSDave Kleikamp return -EINVAL; 2284ac27a0ecSDave Kleikamp } else { 2285617ba13bSMingming Cao if (!(journal = ext4_get_dev_journal(sb, journal_dev))) 2286ac27a0ecSDave Kleikamp return -EINVAL; 2287ac27a0ecSDave Kleikamp } 2288ac27a0ecSDave Kleikamp 2289ac27a0ecSDave Kleikamp if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { 2290dab291afSMingming Cao err = jbd2_journal_update_format(journal); 2291ac27a0ecSDave Kleikamp if (err) { 2292617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: error updating journal.\n"); 2293dab291afSMingming Cao jbd2_journal_destroy(journal); 2294ac27a0ecSDave Kleikamp return err; 2295ac27a0ecSDave Kleikamp } 2296ac27a0ecSDave Kleikamp } 2297ac27a0ecSDave Kleikamp 2298617ba13bSMingming Cao if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) 2299dab291afSMingming Cao err = jbd2_journal_wipe(journal, !really_read_only); 2300ac27a0ecSDave Kleikamp if (!err) 2301dab291afSMingming Cao err = jbd2_journal_load(journal); 2302ac27a0ecSDave Kleikamp 2303ac27a0ecSDave Kleikamp if (err) { 2304617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: error loading journal.\n"); 2305dab291afSMingming Cao jbd2_journal_destroy(journal); 2306ac27a0ecSDave Kleikamp return err; 2307ac27a0ecSDave Kleikamp } 2308ac27a0ecSDave Kleikamp 2309617ba13bSMingming Cao EXT4_SB(sb)->s_journal = journal; 2310617ba13bSMingming Cao ext4_clear_journal_err(sb, es); 2311ac27a0ecSDave Kleikamp 2312ac27a0ecSDave Kleikamp if (journal_devnum && 2313ac27a0ecSDave Kleikamp journal_devnum != le32_to_cpu(es->s_journal_dev)) { 2314ac27a0ecSDave Kleikamp es->s_journal_dev = cpu_to_le32(journal_devnum); 2315ac27a0ecSDave Kleikamp sb->s_dirt = 1; 2316ac27a0ecSDave Kleikamp 2317ac27a0ecSDave Kleikamp /* Make sure we flush the recovery flag to disk. */ 2318617ba13bSMingming Cao ext4_commit_super(sb, es, 1); 2319ac27a0ecSDave Kleikamp } 2320ac27a0ecSDave Kleikamp 2321ac27a0ecSDave Kleikamp return 0; 2322ac27a0ecSDave Kleikamp } 2323ac27a0ecSDave Kleikamp 2324617ba13bSMingming Cao static int ext4_create_journal(struct super_block * sb, 2325617ba13bSMingming Cao struct ext4_super_block * es, 2326ac27a0ecSDave Kleikamp unsigned int journal_inum) 2327ac27a0ecSDave Kleikamp { 2328ac27a0ecSDave Kleikamp journal_t *journal; 23296c675bd4SBorislav Petkov int err; 2330ac27a0ecSDave Kleikamp 2331ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) { 2332617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to " 2333ac27a0ecSDave Kleikamp "create journal.\n"); 2334ac27a0ecSDave Kleikamp return -EROFS; 2335ac27a0ecSDave Kleikamp } 2336ac27a0ecSDave Kleikamp 23376c675bd4SBorislav Petkov journal = ext4_get_journal(sb, journal_inum); 23386c675bd4SBorislav Petkov if (!journal) 2339ac27a0ecSDave Kleikamp return -EINVAL; 2340ac27a0ecSDave Kleikamp 2341617ba13bSMingming Cao printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n", 2342ac27a0ecSDave Kleikamp journal_inum); 2343ac27a0ecSDave Kleikamp 23446c675bd4SBorislav Petkov err = jbd2_journal_create(journal); 23456c675bd4SBorislav Petkov if (err) { 2346617ba13bSMingming Cao printk(KERN_ERR "EXT4-fs: error creating journal.\n"); 2347dab291afSMingming Cao jbd2_journal_destroy(journal); 2348ac27a0ecSDave Kleikamp return -EIO; 2349ac27a0ecSDave Kleikamp } 2350ac27a0ecSDave Kleikamp 2351617ba13bSMingming Cao EXT4_SB(sb)->s_journal = journal; 2352ac27a0ecSDave Kleikamp 2353617ba13bSMingming Cao ext4_update_dynamic_rev(sb); 2354617ba13bSMingming Cao EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2355617ba13bSMingming Cao EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL); 2356ac27a0ecSDave Kleikamp 2357ac27a0ecSDave Kleikamp es->s_journal_inum = cpu_to_le32(journal_inum); 2358ac27a0ecSDave Kleikamp sb->s_dirt = 1; 2359ac27a0ecSDave Kleikamp 2360ac27a0ecSDave Kleikamp /* Make sure we flush the recovery flag to disk. */ 2361617ba13bSMingming Cao ext4_commit_super(sb, es, 1); 2362ac27a0ecSDave Kleikamp 2363ac27a0ecSDave Kleikamp return 0; 2364ac27a0ecSDave Kleikamp } 2365ac27a0ecSDave Kleikamp 2366617ba13bSMingming Cao static void ext4_commit_super (struct super_block * sb, 2367617ba13bSMingming Cao struct ext4_super_block * es, 2368ac27a0ecSDave Kleikamp int sync) 2369ac27a0ecSDave Kleikamp { 2370617ba13bSMingming Cao struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; 2371ac27a0ecSDave Kleikamp 2372ac27a0ecSDave Kleikamp if (!sbh) 2373ac27a0ecSDave Kleikamp return; 2374ac27a0ecSDave Kleikamp es->s_wtime = cpu_to_le32(get_seconds()); 2375bd81d8eeSLaurent Vivier ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb)); 2376617ba13bSMingming Cao es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb)); 2377ac27a0ecSDave Kleikamp BUFFER_TRACE(sbh, "marking dirty"); 2378ac27a0ecSDave Kleikamp mark_buffer_dirty(sbh); 2379ac27a0ecSDave Kleikamp if (sync) 2380ac27a0ecSDave Kleikamp sync_dirty_buffer(sbh); 2381ac27a0ecSDave Kleikamp } 2382ac27a0ecSDave Kleikamp 2383ac27a0ecSDave Kleikamp 2384ac27a0ecSDave Kleikamp /* 2385ac27a0ecSDave Kleikamp * Have we just finished recovery? If so, and if we are mounting (or 2386ac27a0ecSDave Kleikamp * remounting) the filesystem readonly, then we will end up with a 2387ac27a0ecSDave Kleikamp * consistent fs on disk. Record that fact. 2388ac27a0ecSDave Kleikamp */ 2389617ba13bSMingming Cao static void ext4_mark_recovery_complete(struct super_block * sb, 2390617ba13bSMingming Cao struct ext4_super_block * es) 2391ac27a0ecSDave Kleikamp { 2392617ba13bSMingming Cao journal_t *journal = EXT4_SB(sb)->s_journal; 2393ac27a0ecSDave Kleikamp 2394dab291afSMingming Cao jbd2_journal_lock_updates(journal); 2395dab291afSMingming Cao jbd2_journal_flush(journal); 239632c37730SJan Kara lock_super(sb); 2397617ba13bSMingming Cao if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && 2398ac27a0ecSDave Kleikamp sb->s_flags & MS_RDONLY) { 2399617ba13bSMingming Cao EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2400ac27a0ecSDave Kleikamp sb->s_dirt = 0; 2401617ba13bSMingming Cao ext4_commit_super(sb, es, 1); 2402ac27a0ecSDave Kleikamp } 240332c37730SJan Kara unlock_super(sb); 2404dab291afSMingming Cao jbd2_journal_unlock_updates(journal); 2405ac27a0ecSDave Kleikamp } 2406ac27a0ecSDave Kleikamp 2407ac27a0ecSDave Kleikamp /* 2408ac27a0ecSDave Kleikamp * If we are mounting (or read-write remounting) a filesystem whose journal 2409ac27a0ecSDave Kleikamp * has recorded an error from a previous lifetime, move that error to the 2410ac27a0ecSDave Kleikamp * main filesystem now. 2411ac27a0ecSDave Kleikamp */ 2412617ba13bSMingming Cao static void ext4_clear_journal_err(struct super_block * sb, 2413617ba13bSMingming Cao struct ext4_super_block * es) 2414ac27a0ecSDave Kleikamp { 2415ac27a0ecSDave Kleikamp journal_t *journal; 2416ac27a0ecSDave Kleikamp int j_errno; 2417ac27a0ecSDave Kleikamp const char *errstr; 2418ac27a0ecSDave Kleikamp 2419617ba13bSMingming Cao journal = EXT4_SB(sb)->s_journal; 2420ac27a0ecSDave Kleikamp 2421ac27a0ecSDave Kleikamp /* 2422ac27a0ecSDave Kleikamp * Now check for any error status which may have been recorded in the 2423617ba13bSMingming Cao * journal by a prior ext4_error() or ext4_abort() 2424ac27a0ecSDave Kleikamp */ 2425ac27a0ecSDave Kleikamp 2426dab291afSMingming Cao j_errno = jbd2_journal_errno(journal); 2427ac27a0ecSDave Kleikamp if (j_errno) { 2428ac27a0ecSDave Kleikamp char nbuf[16]; 2429ac27a0ecSDave Kleikamp 2430617ba13bSMingming Cao errstr = ext4_decode_error(sb, j_errno, nbuf); 2431617ba13bSMingming Cao ext4_warning(sb, __FUNCTION__, "Filesystem error recorded " 2432ac27a0ecSDave Kleikamp "from previous mount: %s", errstr); 2433617ba13bSMingming Cao ext4_warning(sb, __FUNCTION__, "Marking fs in need of " 2434ac27a0ecSDave Kleikamp "filesystem check."); 2435ac27a0ecSDave Kleikamp 2436617ba13bSMingming Cao EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 2437617ba13bSMingming Cao es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 2438617ba13bSMingming Cao ext4_commit_super (sb, es, 1); 2439ac27a0ecSDave Kleikamp 2440dab291afSMingming Cao jbd2_journal_clear_err(journal); 2441ac27a0ecSDave Kleikamp } 2442ac27a0ecSDave Kleikamp } 2443ac27a0ecSDave Kleikamp 2444ac27a0ecSDave Kleikamp /* 2445ac27a0ecSDave Kleikamp * Force the running and committing transactions to commit, 2446ac27a0ecSDave Kleikamp * and wait on the commit. 2447ac27a0ecSDave Kleikamp */ 2448617ba13bSMingming Cao int ext4_force_commit(struct super_block *sb) 2449ac27a0ecSDave Kleikamp { 2450ac27a0ecSDave Kleikamp journal_t *journal; 2451ac27a0ecSDave Kleikamp int ret; 2452ac27a0ecSDave Kleikamp 2453ac27a0ecSDave Kleikamp if (sb->s_flags & MS_RDONLY) 2454ac27a0ecSDave Kleikamp return 0; 2455ac27a0ecSDave Kleikamp 2456617ba13bSMingming Cao journal = EXT4_SB(sb)->s_journal; 2457ac27a0ecSDave Kleikamp sb->s_dirt = 0; 2458617ba13bSMingming Cao ret = ext4_journal_force_commit(journal); 2459ac27a0ecSDave Kleikamp return ret; 2460ac27a0ecSDave Kleikamp } 2461ac27a0ecSDave Kleikamp 2462ac27a0ecSDave Kleikamp /* 2463617ba13bSMingming Cao * Ext4 always journals updates to the superblock itself, so we don't 2464ac27a0ecSDave Kleikamp * have to propagate any other updates to the superblock on disk at this 2465ac27a0ecSDave Kleikamp * point. Just start an async writeback to get the buffers on their way 2466ac27a0ecSDave Kleikamp * to the disk. 2467ac27a0ecSDave Kleikamp * 2468ac27a0ecSDave Kleikamp * This implicitly triggers the writebehind on sync(). 2469ac27a0ecSDave Kleikamp */ 2470ac27a0ecSDave Kleikamp 2471617ba13bSMingming Cao static void ext4_write_super (struct super_block * sb) 2472ac27a0ecSDave Kleikamp { 2473ac27a0ecSDave Kleikamp if (mutex_trylock(&sb->s_lock) != 0) 2474ac27a0ecSDave Kleikamp BUG(); 2475ac27a0ecSDave Kleikamp sb->s_dirt = 0; 2476ac27a0ecSDave Kleikamp } 2477ac27a0ecSDave Kleikamp 2478617ba13bSMingming Cao static int ext4_sync_fs(struct super_block *sb, int wait) 2479ac27a0ecSDave Kleikamp { 2480ac27a0ecSDave Kleikamp tid_t target; 2481ac27a0ecSDave Kleikamp 2482ac27a0ecSDave Kleikamp sb->s_dirt = 0; 2483dab291afSMingming Cao if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) { 2484ac27a0ecSDave Kleikamp if (wait) 2485dab291afSMingming Cao jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target); 2486ac27a0ecSDave Kleikamp } 2487ac27a0ecSDave Kleikamp return 0; 2488ac27a0ecSDave Kleikamp } 2489ac27a0ecSDave Kleikamp 2490ac27a0ecSDave Kleikamp /* 2491ac27a0ecSDave Kleikamp * LVM calls this function before a (read-only) snapshot is created. This 2492ac27a0ecSDave Kleikamp * gives us a chance to flush the journal completely and mark the fs clean. 2493ac27a0ecSDave Kleikamp */ 2494617ba13bSMingming Cao static void ext4_write_super_lockfs(struct super_block *sb) 2495ac27a0ecSDave Kleikamp { 2496ac27a0ecSDave Kleikamp sb->s_dirt = 0; 2497ac27a0ecSDave Kleikamp 2498ac27a0ecSDave Kleikamp if (!(sb->s_flags & MS_RDONLY)) { 2499617ba13bSMingming Cao journal_t *journal = EXT4_SB(sb)->s_journal; 2500ac27a0ecSDave Kleikamp 2501ac27a0ecSDave Kleikamp /* Now we set up the journal barrier. */ 2502dab291afSMingming Cao jbd2_journal_lock_updates(journal); 2503dab291afSMingming Cao jbd2_journal_flush(journal); 2504ac27a0ecSDave Kleikamp 2505ac27a0ecSDave Kleikamp /* Journal blocked and flushed, clear needs_recovery flag. */ 2506617ba13bSMingming Cao EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2507617ba13bSMingming Cao ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); 2508ac27a0ecSDave Kleikamp } 2509ac27a0ecSDave Kleikamp } 2510ac27a0ecSDave Kleikamp 2511ac27a0ecSDave Kleikamp /* 2512ac27a0ecSDave Kleikamp * Called by LVM after the snapshot is done. We need to reset the RECOVER 2513ac27a0ecSDave Kleikamp * flag here, even though the filesystem is not technically dirty yet. 2514ac27a0ecSDave Kleikamp */ 2515617ba13bSMingming Cao static void ext4_unlockfs(struct super_block *sb) 2516ac27a0ecSDave Kleikamp { 2517ac27a0ecSDave Kleikamp if (!(sb->s_flags & MS_RDONLY)) { 2518ac27a0ecSDave Kleikamp lock_super(sb); 2519ac27a0ecSDave Kleikamp /* Reser the needs_recovery flag before the fs is unlocked. */ 2520617ba13bSMingming Cao EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2521617ba13bSMingming Cao ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); 2522ac27a0ecSDave Kleikamp unlock_super(sb); 2523dab291afSMingming Cao jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 2524ac27a0ecSDave Kleikamp } 2525ac27a0ecSDave Kleikamp } 2526ac27a0ecSDave Kleikamp 2527617ba13bSMingming Cao static int ext4_remount (struct super_block * sb, int * flags, char * data) 2528ac27a0ecSDave Kleikamp { 2529617ba13bSMingming Cao struct ext4_super_block * es; 2530617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 2531617ba13bSMingming Cao ext4_fsblk_t n_blocks_count = 0; 2532ac27a0ecSDave Kleikamp unsigned long old_sb_flags; 2533617ba13bSMingming Cao struct ext4_mount_options old_opts; 2534ac27a0ecSDave Kleikamp int err; 2535ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 2536ac27a0ecSDave Kleikamp int i; 2537ac27a0ecSDave Kleikamp #endif 2538ac27a0ecSDave Kleikamp 2539ac27a0ecSDave Kleikamp /* Store the original options */ 2540ac27a0ecSDave Kleikamp old_sb_flags = sb->s_flags; 2541ac27a0ecSDave Kleikamp old_opts.s_mount_opt = sbi->s_mount_opt; 2542ac27a0ecSDave Kleikamp old_opts.s_resuid = sbi->s_resuid; 2543ac27a0ecSDave Kleikamp old_opts.s_resgid = sbi->s_resgid; 2544ac27a0ecSDave Kleikamp old_opts.s_commit_interval = sbi->s_commit_interval; 2545ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 2546ac27a0ecSDave Kleikamp old_opts.s_jquota_fmt = sbi->s_jquota_fmt; 2547ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) 2548ac27a0ecSDave Kleikamp old_opts.s_qf_names[i] = sbi->s_qf_names[i]; 2549ac27a0ecSDave Kleikamp #endif 2550ac27a0ecSDave Kleikamp 2551ac27a0ecSDave Kleikamp /* 2552ac27a0ecSDave Kleikamp * Allow the "check" option to be passed as a remount option. 2553ac27a0ecSDave Kleikamp */ 2554ac27a0ecSDave Kleikamp if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) { 2555ac27a0ecSDave Kleikamp err = -EINVAL; 2556ac27a0ecSDave Kleikamp goto restore_opts; 2557ac27a0ecSDave Kleikamp } 2558ac27a0ecSDave Kleikamp 2559617ba13bSMingming Cao if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) 2560617ba13bSMingming Cao ext4_abort(sb, __FUNCTION__, "Abort forced by user"); 2561ac27a0ecSDave Kleikamp 2562ac27a0ecSDave Kleikamp sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 2563617ba13bSMingming Cao ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 2564ac27a0ecSDave Kleikamp 2565ac27a0ecSDave Kleikamp es = sbi->s_es; 2566ac27a0ecSDave Kleikamp 2567617ba13bSMingming Cao ext4_init_journal_params(sb, sbi->s_journal); 2568ac27a0ecSDave Kleikamp 2569ac27a0ecSDave Kleikamp if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || 2570bd81d8eeSLaurent Vivier n_blocks_count > ext4_blocks_count(es)) { 2571617ba13bSMingming Cao if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) { 2572ac27a0ecSDave Kleikamp err = -EROFS; 2573ac27a0ecSDave Kleikamp goto restore_opts; 2574ac27a0ecSDave Kleikamp } 2575ac27a0ecSDave Kleikamp 2576ac27a0ecSDave Kleikamp if (*flags & MS_RDONLY) { 2577ac27a0ecSDave Kleikamp /* 2578ac27a0ecSDave Kleikamp * First of all, the unconditional stuff we have to do 2579ac27a0ecSDave Kleikamp * to disable replay of the journal when we next remount 2580ac27a0ecSDave Kleikamp */ 2581ac27a0ecSDave Kleikamp sb->s_flags |= MS_RDONLY; 2582ac27a0ecSDave Kleikamp 2583ac27a0ecSDave Kleikamp /* 2584ac27a0ecSDave Kleikamp * OK, test if we are remounting a valid rw partition 2585ac27a0ecSDave Kleikamp * readonly, and if so set the rdonly flag and then 2586ac27a0ecSDave Kleikamp * mark the partition as valid again. 2587ac27a0ecSDave Kleikamp */ 2588617ba13bSMingming Cao if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && 2589617ba13bSMingming Cao (sbi->s_mount_state & EXT4_VALID_FS)) 2590ac27a0ecSDave Kleikamp es->s_state = cpu_to_le16(sbi->s_mount_state); 2591ac27a0ecSDave Kleikamp 259232c37730SJan Kara /* 259332c37730SJan Kara * We have to unlock super so that we can wait for 259432c37730SJan Kara * transactions. 259532c37730SJan Kara */ 259632c37730SJan Kara unlock_super(sb); 2597617ba13bSMingming Cao ext4_mark_recovery_complete(sb, es); 259832c37730SJan Kara lock_super(sb); 2599ac27a0ecSDave Kleikamp } else { 2600ac27a0ecSDave Kleikamp __le32 ret; 2601617ba13bSMingming Cao if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb, 2602617ba13bSMingming Cao ~EXT4_FEATURE_RO_COMPAT_SUPP))) { 2603617ba13bSMingming Cao printk(KERN_WARNING "EXT4-fs: %s: couldn't " 2604ac27a0ecSDave Kleikamp "remount RDWR because of unsupported " 2605ac27a0ecSDave Kleikamp "optional features (%x).\n", 2606ac27a0ecSDave Kleikamp sb->s_id, le32_to_cpu(ret)); 2607ac27a0ecSDave Kleikamp err = -EROFS; 2608ac27a0ecSDave Kleikamp goto restore_opts; 2609ac27a0ecSDave Kleikamp } 2610ead6596bSEric Sandeen 2611ead6596bSEric Sandeen /* 2612ead6596bSEric Sandeen * If we have an unprocessed orphan list hanging 2613ead6596bSEric Sandeen * around from a previously readonly bdev mount, 2614ead6596bSEric Sandeen * require a full umount/remount for now. 2615ead6596bSEric Sandeen */ 2616ead6596bSEric Sandeen if (es->s_last_orphan) { 2617ead6596bSEric Sandeen printk(KERN_WARNING "EXT4-fs: %s: couldn't " 2618ead6596bSEric Sandeen "remount RDWR because of unprocessed " 2619ead6596bSEric Sandeen "orphan inode list. Please " 2620ead6596bSEric Sandeen "umount/remount instead.\n", 2621ead6596bSEric Sandeen sb->s_id); 2622ead6596bSEric Sandeen err = -EINVAL; 2623ead6596bSEric Sandeen goto restore_opts; 2624ead6596bSEric Sandeen } 2625ead6596bSEric Sandeen 2626ac27a0ecSDave Kleikamp /* 2627ac27a0ecSDave Kleikamp * Mounting a RDONLY partition read-write, so reread 2628ac27a0ecSDave Kleikamp * and store the current valid flag. (It may have 2629ac27a0ecSDave Kleikamp * been changed by e2fsck since we originally mounted 2630ac27a0ecSDave Kleikamp * the partition.) 2631ac27a0ecSDave Kleikamp */ 2632617ba13bSMingming Cao ext4_clear_journal_err(sb, es); 2633ac27a0ecSDave Kleikamp sbi->s_mount_state = le16_to_cpu(es->s_state); 2634617ba13bSMingming Cao if ((err = ext4_group_extend(sb, es, n_blocks_count))) 2635ac27a0ecSDave Kleikamp goto restore_opts; 2636617ba13bSMingming Cao if (!ext4_setup_super (sb, es, 0)) 2637ac27a0ecSDave Kleikamp sb->s_flags &= ~MS_RDONLY; 2638ac27a0ecSDave Kleikamp } 2639ac27a0ecSDave Kleikamp } 2640ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 2641ac27a0ecSDave Kleikamp /* Release old quota file names */ 2642ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) 2643ac27a0ecSDave Kleikamp if (old_opts.s_qf_names[i] && 2644ac27a0ecSDave Kleikamp old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 2645ac27a0ecSDave Kleikamp kfree(old_opts.s_qf_names[i]); 2646ac27a0ecSDave Kleikamp #endif 2647ac27a0ecSDave Kleikamp return 0; 2648ac27a0ecSDave Kleikamp restore_opts: 2649ac27a0ecSDave Kleikamp sb->s_flags = old_sb_flags; 2650ac27a0ecSDave Kleikamp sbi->s_mount_opt = old_opts.s_mount_opt; 2651ac27a0ecSDave Kleikamp sbi->s_resuid = old_opts.s_resuid; 2652ac27a0ecSDave Kleikamp sbi->s_resgid = old_opts.s_resgid; 2653ac27a0ecSDave Kleikamp sbi->s_commit_interval = old_opts.s_commit_interval; 2654ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 2655ac27a0ecSDave Kleikamp sbi->s_jquota_fmt = old_opts.s_jquota_fmt; 2656ac27a0ecSDave Kleikamp for (i = 0; i < MAXQUOTAS; i++) { 2657ac27a0ecSDave Kleikamp if (sbi->s_qf_names[i] && 2658ac27a0ecSDave Kleikamp old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 2659ac27a0ecSDave Kleikamp kfree(sbi->s_qf_names[i]); 2660ac27a0ecSDave Kleikamp sbi->s_qf_names[i] = old_opts.s_qf_names[i]; 2661ac27a0ecSDave Kleikamp } 2662ac27a0ecSDave Kleikamp #endif 2663ac27a0ecSDave Kleikamp return err; 2664ac27a0ecSDave Kleikamp } 2665ac27a0ecSDave Kleikamp 2666617ba13bSMingming Cao static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf) 2667ac27a0ecSDave Kleikamp { 2668ac27a0ecSDave Kleikamp struct super_block *sb = dentry->d_sb; 2669617ba13bSMingming Cao struct ext4_sb_info *sbi = EXT4_SB(sb); 2670617ba13bSMingming Cao struct ext4_super_block *es = sbi->s_es; 2671960cc398SPekka Enberg u64 fsid; 2672ac27a0ecSDave Kleikamp 26735e70030dSBadari Pulavarty if (test_opt(sb, MINIX_DF)) { 26745e70030dSBadari Pulavarty sbi->s_overhead_last = 0; 26756bc9feffSAneesh Kumar K.V } else if (sbi->s_blocks_last != ext4_blocks_count(es)) { 26765e70030dSBadari Pulavarty unsigned long ngroups = sbi->s_groups_count, i; 26775e70030dSBadari Pulavarty ext4_fsblk_t overhead = 0; 2678ac27a0ecSDave Kleikamp smp_rmb(); 2679ac27a0ecSDave Kleikamp 2680ac27a0ecSDave Kleikamp /* 26815e70030dSBadari Pulavarty * Compute the overhead (FS structures). This is constant 26825e70030dSBadari Pulavarty * for a given filesystem unless the number of block groups 26835e70030dSBadari Pulavarty * changes so we cache the previous value until it does. 2684ac27a0ecSDave Kleikamp */ 2685ac27a0ecSDave Kleikamp 2686ac27a0ecSDave Kleikamp /* 2687ac27a0ecSDave Kleikamp * All of the blocks before first_data_block are 2688ac27a0ecSDave Kleikamp * overhead 2689ac27a0ecSDave Kleikamp */ 2690ac27a0ecSDave Kleikamp overhead = le32_to_cpu(es->s_first_data_block); 2691ac27a0ecSDave Kleikamp 2692ac27a0ecSDave Kleikamp /* 2693ac27a0ecSDave Kleikamp * Add the overhead attributed to the superblock and 2694ac27a0ecSDave Kleikamp * block group descriptors. If the sparse superblocks 2695ac27a0ecSDave Kleikamp * feature is turned on, then not all groups have this. 2696ac27a0ecSDave Kleikamp */ 2697ac27a0ecSDave Kleikamp for (i = 0; i < ngroups; i++) { 2698617ba13bSMingming Cao overhead += ext4_bg_has_super(sb, i) + 2699617ba13bSMingming Cao ext4_bg_num_gdb(sb, i); 2700ac27a0ecSDave Kleikamp cond_resched(); 2701ac27a0ecSDave Kleikamp } 2702ac27a0ecSDave Kleikamp 2703ac27a0ecSDave Kleikamp /* 2704ac27a0ecSDave Kleikamp * Every block group has an inode bitmap, a block 2705ac27a0ecSDave Kleikamp * bitmap, and an inode table. 2706ac27a0ecSDave Kleikamp */ 27075e70030dSBadari Pulavarty overhead += ngroups * (2 + sbi->s_itb_per_group); 27085e70030dSBadari Pulavarty sbi->s_overhead_last = overhead; 27095e70030dSBadari Pulavarty smp_wmb(); 27106bc9feffSAneesh Kumar K.V sbi->s_blocks_last = ext4_blocks_count(es); 2711ac27a0ecSDave Kleikamp } 2712ac27a0ecSDave Kleikamp 2713617ba13bSMingming Cao buf->f_type = EXT4_SUPER_MAGIC; 2714ac27a0ecSDave Kleikamp buf->f_bsize = sb->s_blocksize; 27155e70030dSBadari Pulavarty buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last; 271652d9f3b4SPeter Zijlstra buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter); 2717308ba3ecSAneesh Kumar K.V ext4_free_blocks_count_set(es, buf->f_bfree); 2718bd81d8eeSLaurent Vivier buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); 2719bd81d8eeSLaurent Vivier if (buf->f_bfree < ext4_r_blocks_count(es)) 2720ac27a0ecSDave Kleikamp buf->f_bavail = 0; 2721ac27a0ecSDave Kleikamp buf->f_files = le32_to_cpu(es->s_inodes_count); 272252d9f3b4SPeter Zijlstra buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); 27235e70030dSBadari Pulavarty es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); 2724617ba13bSMingming Cao buf->f_namelen = EXT4_NAME_LEN; 2725960cc398SPekka Enberg fsid = le64_to_cpup((void *)es->s_uuid) ^ 2726960cc398SPekka Enberg le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 2727960cc398SPekka Enberg buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 2728960cc398SPekka Enberg buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 2729ac27a0ecSDave Kleikamp return 0; 2730ac27a0ecSDave Kleikamp } 2731ac27a0ecSDave Kleikamp 2732ac27a0ecSDave Kleikamp /* Helper function for writing quotas on sync - we need to start transaction before quota file 2733ac27a0ecSDave Kleikamp * is locked for write. Otherwise the are possible deadlocks: 2734ac27a0ecSDave Kleikamp * Process 1 Process 2 2735617ba13bSMingming Cao * ext4_create() quota_sync() 2736dab291afSMingming Cao * jbd2_journal_start() write_dquot() 2737ac27a0ecSDave Kleikamp * DQUOT_INIT() down(dqio_mutex) 2738dab291afSMingming Cao * down(dqio_mutex) jbd2_journal_start() 2739ac27a0ecSDave Kleikamp * 2740ac27a0ecSDave Kleikamp */ 2741ac27a0ecSDave Kleikamp 2742ac27a0ecSDave Kleikamp #ifdef CONFIG_QUOTA 2743ac27a0ecSDave Kleikamp 2744ac27a0ecSDave Kleikamp static inline struct inode *dquot_to_inode(struct dquot *dquot) 2745ac27a0ecSDave Kleikamp { 2746ac27a0ecSDave Kleikamp return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; 2747ac27a0ecSDave Kleikamp } 2748ac27a0ecSDave Kleikamp 2749617ba13bSMingming Cao static int ext4_dquot_initialize(struct inode *inode, int type) 2750ac27a0ecSDave Kleikamp { 2751ac27a0ecSDave Kleikamp handle_t *handle; 2752ac27a0ecSDave Kleikamp int ret, err; 2753ac27a0ecSDave Kleikamp 2754ac27a0ecSDave Kleikamp /* We may create quota structure so we need to reserve enough blocks */ 2755617ba13bSMingming Cao handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb)); 2756ac27a0ecSDave Kleikamp if (IS_ERR(handle)) 2757ac27a0ecSDave Kleikamp return PTR_ERR(handle); 2758ac27a0ecSDave Kleikamp ret = dquot_initialize(inode, type); 2759617ba13bSMingming Cao err = ext4_journal_stop(handle); 2760ac27a0ecSDave Kleikamp if (!ret) 2761ac27a0ecSDave Kleikamp ret = err; 2762ac27a0ecSDave Kleikamp return ret; 2763ac27a0ecSDave Kleikamp } 2764ac27a0ecSDave Kleikamp 2765617ba13bSMingming Cao static int ext4_dquot_drop(struct inode *inode) 2766ac27a0ecSDave Kleikamp { 2767ac27a0ecSDave Kleikamp handle_t *handle; 2768ac27a0ecSDave Kleikamp int ret, err; 2769ac27a0ecSDave Kleikamp 2770ac27a0ecSDave Kleikamp /* We may delete quota structure so we need to reserve enough blocks */ 2771617ba13bSMingming Cao handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb)); 2772ac27a0ecSDave Kleikamp if (IS_ERR(handle)) 2773ac27a0ecSDave Kleikamp return PTR_ERR(handle); 2774ac27a0ecSDave Kleikamp ret = dquot_drop(inode); 2775617ba13bSMingming Cao err = ext4_journal_stop(handle); 2776ac27a0ecSDave Kleikamp if (!ret) 2777ac27a0ecSDave Kleikamp ret = err; 2778ac27a0ecSDave Kleikamp return ret; 2779ac27a0ecSDave Kleikamp } 2780ac27a0ecSDave Kleikamp 2781617ba13bSMingming Cao static int ext4_write_dquot(struct dquot *dquot) 2782ac27a0ecSDave Kleikamp { 2783ac27a0ecSDave Kleikamp int ret, err; 2784ac27a0ecSDave Kleikamp handle_t *handle; 2785ac27a0ecSDave Kleikamp struct inode *inode; 2786ac27a0ecSDave Kleikamp 2787ac27a0ecSDave Kleikamp inode = dquot_to_inode(dquot); 2788617ba13bSMingming Cao handle = ext4_journal_start(inode, 2789617ba13bSMingming Cao EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 2790ac27a0ecSDave Kleikamp if (IS_ERR(handle)) 2791ac27a0ecSDave Kleikamp return PTR_ERR(handle); 2792ac27a0ecSDave Kleikamp ret = dquot_commit(dquot); 2793617ba13bSMingming Cao err = ext4_journal_stop(handle); 2794ac27a0ecSDave Kleikamp if (!ret) 2795ac27a0ecSDave Kleikamp ret = err; 2796ac27a0ecSDave Kleikamp return ret; 2797ac27a0ecSDave Kleikamp } 2798ac27a0ecSDave Kleikamp 2799617ba13bSMingming Cao static int ext4_acquire_dquot(struct dquot *dquot) 2800ac27a0ecSDave Kleikamp { 2801ac27a0ecSDave Kleikamp int ret, err; 2802ac27a0ecSDave Kleikamp handle_t *handle; 2803ac27a0ecSDave Kleikamp 2804617ba13bSMingming Cao handle = ext4_journal_start(dquot_to_inode(dquot), 2805617ba13bSMingming Cao EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 2806ac27a0ecSDave Kleikamp if (IS_ERR(handle)) 2807ac27a0ecSDave Kleikamp return PTR_ERR(handle); 2808ac27a0ecSDave Kleikamp ret = dquot_acquire(dquot); 2809617ba13bSMingming Cao err = ext4_journal_stop(handle); 2810ac27a0ecSDave Kleikamp if (!ret) 2811ac27a0ecSDave Kleikamp ret = err; 2812ac27a0ecSDave Kleikamp return ret; 2813ac27a0ecSDave Kleikamp } 2814ac27a0ecSDave Kleikamp 2815617ba13bSMingming Cao static int ext4_release_dquot(struct dquot *dquot) 2816ac27a0ecSDave Kleikamp { 2817ac27a0ecSDave Kleikamp int ret, err; 2818ac27a0ecSDave Kleikamp handle_t *handle; 2819ac27a0ecSDave Kleikamp 2820617ba13bSMingming Cao handle = ext4_journal_start(dquot_to_inode(dquot), 2821617ba13bSMingming Cao EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 28229c3013e9SJan Kara if (IS_ERR(handle)) { 28239c3013e9SJan Kara /* Release dquot anyway to avoid endless cycle in dqput() */ 28249c3013e9SJan Kara dquot_release(dquot); 2825ac27a0ecSDave Kleikamp return PTR_ERR(handle); 28269c3013e9SJan Kara } 2827ac27a0ecSDave Kleikamp ret = dquot_release(dquot); 2828617ba13bSMingming Cao err = ext4_journal_stop(handle); 2829ac27a0ecSDave Kleikamp if (!ret) 2830ac27a0ecSDave Kleikamp ret = err; 2831ac27a0ecSDave Kleikamp return ret; 2832ac27a0ecSDave Kleikamp } 2833ac27a0ecSDave Kleikamp 2834617ba13bSMingming Cao static int ext4_mark_dquot_dirty(struct dquot *dquot) 2835ac27a0ecSDave Kleikamp { 2836ac27a0ecSDave Kleikamp /* Are we journalling quotas? */ 2837617ba13bSMingming Cao if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || 2838617ba13bSMingming Cao EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { 2839ac27a0ecSDave Kleikamp dquot_mark_dquot_dirty(dquot); 2840617ba13bSMingming Cao return ext4_write_dquot(dquot); 2841ac27a0ecSDave Kleikamp } else { 2842ac27a0ecSDave Kleikamp return dquot_mark_dquot_dirty(dquot); 2843ac27a0ecSDave Kleikamp } 2844ac27a0ecSDave Kleikamp } 2845ac27a0ecSDave Kleikamp 2846617ba13bSMingming Cao static int ext4_write_info(struct super_block *sb, int type) 2847ac27a0ecSDave Kleikamp { 2848ac27a0ecSDave Kleikamp int ret, err; 2849ac27a0ecSDave Kleikamp handle_t *handle; 2850ac27a0ecSDave Kleikamp 2851ac27a0ecSDave Kleikamp /* Data block + inode block */ 2852617ba13bSMingming Cao handle = ext4_journal_start(sb->s_root->d_inode, 2); 2853ac27a0ecSDave Kleikamp if (IS_ERR(handle)) 2854ac27a0ecSDave Kleikamp return PTR_ERR(handle); 2855ac27a0ecSDave Kleikamp ret = dquot_commit_info(sb, type); 2856617ba13bSMingming Cao err = ext4_journal_stop(handle); 2857ac27a0ecSDave Kleikamp if (!ret) 2858ac27a0ecSDave Kleikamp ret = err; 2859ac27a0ecSDave Kleikamp return ret; 2860ac27a0ecSDave Kleikamp } 2861ac27a0ecSDave Kleikamp 2862ac27a0ecSDave Kleikamp /* 2863ac27a0ecSDave Kleikamp * Turn on quotas during mount time - we need to find 2864ac27a0ecSDave Kleikamp * the quota file and such... 2865ac27a0ecSDave Kleikamp */ 2866617ba13bSMingming Cao static int ext4_quota_on_mount(struct super_block *sb, int type) 2867ac27a0ecSDave Kleikamp { 2868617ba13bSMingming Cao return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], 2869617ba13bSMingming Cao EXT4_SB(sb)->s_jquota_fmt, type); 2870ac27a0ecSDave Kleikamp } 2871ac27a0ecSDave Kleikamp 2872ac27a0ecSDave Kleikamp /* 2873ac27a0ecSDave Kleikamp * Standard function to be called on quota_on 2874ac27a0ecSDave Kleikamp */ 2875617ba13bSMingming Cao static int ext4_quota_on(struct super_block *sb, int type, int format_id, 2876ac27a0ecSDave Kleikamp char *path) 2877ac27a0ecSDave Kleikamp { 2878ac27a0ecSDave Kleikamp int err; 2879ac27a0ecSDave Kleikamp struct nameidata nd; 2880ac27a0ecSDave Kleikamp 2881ac27a0ecSDave Kleikamp if (!test_opt(sb, QUOTA)) 2882ac27a0ecSDave Kleikamp return -EINVAL; 2883ac27a0ecSDave Kleikamp /* Not journalling quota? */ 2884617ba13bSMingming Cao if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] && 2885617ba13bSMingming Cao !EXT4_SB(sb)->s_qf_names[GRPQUOTA]) 2886ac27a0ecSDave Kleikamp return vfs_quota_on(sb, type, format_id, path); 2887ac27a0ecSDave Kleikamp err = path_lookup(path, LOOKUP_FOLLOW, &nd); 2888ac27a0ecSDave Kleikamp if (err) 2889ac27a0ecSDave Kleikamp return err; 2890ac27a0ecSDave Kleikamp /* Quotafile not on the same filesystem? */ 2891ac27a0ecSDave Kleikamp if (nd.mnt->mnt_sb != sb) { 2892ac27a0ecSDave Kleikamp path_release(&nd); 2893ac27a0ecSDave Kleikamp return -EXDEV; 2894ac27a0ecSDave Kleikamp } 2895ac27a0ecSDave Kleikamp /* Quotafile not of fs root? */ 2896ac27a0ecSDave Kleikamp if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode) 2897ac27a0ecSDave Kleikamp printk(KERN_WARNING 2898617ba13bSMingming Cao "EXT4-fs: Quota file not on filesystem root. " 2899ac27a0ecSDave Kleikamp "Journalled quota will not work.\n"); 2900ac27a0ecSDave Kleikamp path_release(&nd); 2901ac27a0ecSDave Kleikamp return vfs_quota_on(sb, type, format_id, path); 2902ac27a0ecSDave Kleikamp } 2903ac27a0ecSDave Kleikamp 2904ac27a0ecSDave Kleikamp /* Read data from quotafile - avoid pagecache and such because we cannot afford 2905ac27a0ecSDave Kleikamp * acquiring the locks... As quota files are never truncated and quota code 2906ac27a0ecSDave Kleikamp * itself serializes the operations (and noone else should touch the files) 2907ac27a0ecSDave Kleikamp * we don't have to be afraid of races */ 2908617ba13bSMingming Cao static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 2909ac27a0ecSDave Kleikamp size_t len, loff_t off) 2910ac27a0ecSDave Kleikamp { 2911ac27a0ecSDave Kleikamp struct inode *inode = sb_dqopt(sb)->files[type]; 2912617ba13bSMingming Cao sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 2913ac27a0ecSDave Kleikamp int err = 0; 2914ac27a0ecSDave Kleikamp int offset = off & (sb->s_blocksize - 1); 2915ac27a0ecSDave Kleikamp int tocopy; 2916ac27a0ecSDave Kleikamp size_t toread; 2917ac27a0ecSDave Kleikamp struct buffer_head *bh; 2918ac27a0ecSDave Kleikamp loff_t i_size = i_size_read(inode); 2919ac27a0ecSDave Kleikamp 2920ac27a0ecSDave Kleikamp if (off > i_size) 2921ac27a0ecSDave Kleikamp return 0; 2922ac27a0ecSDave Kleikamp if (off+len > i_size) 2923ac27a0ecSDave Kleikamp len = i_size-off; 2924ac27a0ecSDave Kleikamp toread = len; 2925ac27a0ecSDave Kleikamp while (toread > 0) { 2926ac27a0ecSDave Kleikamp tocopy = sb->s_blocksize - offset < toread ? 2927ac27a0ecSDave Kleikamp sb->s_blocksize - offset : toread; 2928617ba13bSMingming Cao bh = ext4_bread(NULL, inode, blk, 0, &err); 2929ac27a0ecSDave Kleikamp if (err) 2930ac27a0ecSDave Kleikamp return err; 2931ac27a0ecSDave Kleikamp if (!bh) /* A hole? */ 2932ac27a0ecSDave Kleikamp memset(data, 0, tocopy); 2933ac27a0ecSDave Kleikamp else 2934ac27a0ecSDave Kleikamp memcpy(data, bh->b_data+offset, tocopy); 2935ac27a0ecSDave Kleikamp brelse(bh); 2936ac27a0ecSDave Kleikamp offset = 0; 2937ac27a0ecSDave Kleikamp toread -= tocopy; 2938ac27a0ecSDave Kleikamp data += tocopy; 2939ac27a0ecSDave Kleikamp blk++; 2940ac27a0ecSDave Kleikamp } 2941ac27a0ecSDave Kleikamp return len; 2942ac27a0ecSDave Kleikamp } 2943ac27a0ecSDave Kleikamp 2944ac27a0ecSDave Kleikamp /* Write to quotafile (we know the transaction is already started and has 2945ac27a0ecSDave Kleikamp * enough credits) */ 2946617ba13bSMingming Cao static ssize_t ext4_quota_write(struct super_block *sb, int type, 2947ac27a0ecSDave Kleikamp const char *data, size_t len, loff_t off) 2948ac27a0ecSDave Kleikamp { 2949ac27a0ecSDave Kleikamp struct inode *inode = sb_dqopt(sb)->files[type]; 2950617ba13bSMingming Cao sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 2951ac27a0ecSDave Kleikamp int err = 0; 2952ac27a0ecSDave Kleikamp int offset = off & (sb->s_blocksize - 1); 2953ac27a0ecSDave Kleikamp int tocopy; 2954617ba13bSMingming Cao int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL; 2955ac27a0ecSDave Kleikamp size_t towrite = len; 2956ac27a0ecSDave Kleikamp struct buffer_head *bh; 2957ac27a0ecSDave Kleikamp handle_t *handle = journal_current_handle(); 2958ac27a0ecSDave Kleikamp 29599c3013e9SJan Kara if (!handle) { 29609c3013e9SJan Kara printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)" 29619c3013e9SJan Kara " cancelled because transaction is not started.\n", 29629c3013e9SJan Kara (unsigned long long)off, (unsigned long long)len); 29639c3013e9SJan Kara return -EIO; 29649c3013e9SJan Kara } 2965ac27a0ecSDave Kleikamp mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 2966ac27a0ecSDave Kleikamp while (towrite > 0) { 2967ac27a0ecSDave Kleikamp tocopy = sb->s_blocksize - offset < towrite ? 2968ac27a0ecSDave Kleikamp sb->s_blocksize - offset : towrite; 2969617ba13bSMingming Cao bh = ext4_bread(handle, inode, blk, 1, &err); 2970ac27a0ecSDave Kleikamp if (!bh) 2971ac27a0ecSDave Kleikamp goto out; 2972ac27a0ecSDave Kleikamp if (journal_quota) { 2973617ba13bSMingming Cao err = ext4_journal_get_write_access(handle, bh); 2974ac27a0ecSDave Kleikamp if (err) { 2975ac27a0ecSDave Kleikamp brelse(bh); 2976ac27a0ecSDave Kleikamp goto out; 2977ac27a0ecSDave Kleikamp } 2978ac27a0ecSDave Kleikamp } 2979ac27a0ecSDave Kleikamp lock_buffer(bh); 2980ac27a0ecSDave Kleikamp memcpy(bh->b_data+offset, data, tocopy); 2981ac27a0ecSDave Kleikamp flush_dcache_page(bh->b_page); 2982ac27a0ecSDave Kleikamp unlock_buffer(bh); 2983ac27a0ecSDave Kleikamp if (journal_quota) 2984617ba13bSMingming Cao err = ext4_journal_dirty_metadata(handle, bh); 2985ac27a0ecSDave Kleikamp else { 2986ac27a0ecSDave Kleikamp /* Always do at least ordered writes for quotas */ 2987617ba13bSMingming Cao err = ext4_journal_dirty_data(handle, bh); 2988ac27a0ecSDave Kleikamp mark_buffer_dirty(bh); 2989ac27a0ecSDave Kleikamp } 2990ac27a0ecSDave Kleikamp brelse(bh); 2991ac27a0ecSDave Kleikamp if (err) 2992ac27a0ecSDave Kleikamp goto out; 2993ac27a0ecSDave Kleikamp offset = 0; 2994ac27a0ecSDave Kleikamp towrite -= tocopy; 2995ac27a0ecSDave Kleikamp data += tocopy; 2996ac27a0ecSDave Kleikamp blk++; 2997ac27a0ecSDave Kleikamp } 2998ac27a0ecSDave Kleikamp out: 2999ac27a0ecSDave Kleikamp if (len == towrite) 3000ac27a0ecSDave Kleikamp return err; 3001ac27a0ecSDave Kleikamp if (inode->i_size < off+len-towrite) { 3002ac27a0ecSDave Kleikamp i_size_write(inode, off+len-towrite); 3003617ba13bSMingming Cao EXT4_I(inode)->i_disksize = inode->i_size; 3004ac27a0ecSDave Kleikamp } 3005ac27a0ecSDave Kleikamp inode->i_version++; 3006ac27a0ecSDave Kleikamp inode->i_mtime = inode->i_ctime = CURRENT_TIME; 3007617ba13bSMingming Cao ext4_mark_inode_dirty(handle, inode); 3008ac27a0ecSDave Kleikamp mutex_unlock(&inode->i_mutex); 3009ac27a0ecSDave Kleikamp return len - towrite; 3010ac27a0ecSDave Kleikamp } 3011ac27a0ecSDave Kleikamp 3012ac27a0ecSDave Kleikamp #endif 3013ac27a0ecSDave Kleikamp 3014617ba13bSMingming Cao static int ext4_get_sb(struct file_system_type *fs_type, 3015ac27a0ecSDave Kleikamp int flags, const char *dev_name, void *data, struct vfsmount *mnt) 3016ac27a0ecSDave Kleikamp { 3017617ba13bSMingming Cao return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt); 3018ac27a0ecSDave Kleikamp } 3019ac27a0ecSDave Kleikamp 3020617ba13bSMingming Cao static struct file_system_type ext4dev_fs_type = { 3021ac27a0ecSDave Kleikamp .owner = THIS_MODULE, 3022617ba13bSMingming Cao .name = "ext4dev", 3023617ba13bSMingming Cao .get_sb = ext4_get_sb, 3024ac27a0ecSDave Kleikamp .kill_sb = kill_block_super, 3025ac27a0ecSDave Kleikamp .fs_flags = FS_REQUIRES_DEV, 3026ac27a0ecSDave Kleikamp }; 3027ac27a0ecSDave Kleikamp 3028617ba13bSMingming Cao static int __init init_ext4_fs(void) 3029ac27a0ecSDave Kleikamp { 3030617ba13bSMingming Cao int err = init_ext4_xattr(); 3031ac27a0ecSDave Kleikamp if (err) 3032ac27a0ecSDave Kleikamp return err; 3033ac27a0ecSDave Kleikamp err = init_inodecache(); 3034ac27a0ecSDave Kleikamp if (err) 3035ac27a0ecSDave Kleikamp goto out1; 3036617ba13bSMingming Cao err = register_filesystem(&ext4dev_fs_type); 3037ac27a0ecSDave Kleikamp if (err) 3038ac27a0ecSDave Kleikamp goto out; 3039ac27a0ecSDave Kleikamp return 0; 3040ac27a0ecSDave Kleikamp out: 3041ac27a0ecSDave Kleikamp destroy_inodecache(); 3042ac27a0ecSDave Kleikamp out1: 3043617ba13bSMingming Cao exit_ext4_xattr(); 3044ac27a0ecSDave Kleikamp return err; 3045ac27a0ecSDave Kleikamp } 3046ac27a0ecSDave Kleikamp 3047617ba13bSMingming Cao static void __exit exit_ext4_fs(void) 3048ac27a0ecSDave Kleikamp { 3049617ba13bSMingming Cao unregister_filesystem(&ext4dev_fs_type); 3050ac27a0ecSDave Kleikamp destroy_inodecache(); 3051617ba13bSMingming Cao exit_ext4_xattr(); 3052ac27a0ecSDave Kleikamp } 3053ac27a0ecSDave Kleikamp 3054ac27a0ecSDave Kleikamp MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); 3055617ba13bSMingming Cao MODULE_DESCRIPTION("Fourth Extended Filesystem with extents"); 3056ac27a0ecSDave Kleikamp MODULE_LICENSE("GPL"); 3057617ba13bSMingming Cao module_init(init_ext4_fs) 3058617ba13bSMingming Cao module_exit(exit_ext4_fs) 3059