1 /* 2 * linux/fs/ext4/super.c 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/fs/minix/inode.c 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 * 15 * Big-endian to little-endian byte-swapping/bitmaps by 16 * David S. Miller (davem@caip.rutgers.edu), 1995 17 */ 18 19 #include <linux/module.h> 20 #include <linux/string.h> 21 #include <linux/fs.h> 22 #include <linux/time.h> 23 #include <linux/jbd2.h> 24 #include <linux/ext4_fs.h> 25 #include <linux/ext4_jbd2.h> 26 #include <linux/slab.h> 27 #include <linux/init.h> 28 #include <linux/blkdev.h> 29 #include <linux/parser.h> 30 #include <linux/smp_lock.h> 31 #include <linux/buffer_head.h> 32 #include <linux/exportfs.h> 33 #include <linux/vfs.h> 34 #include <linux/random.h> 35 #include <linux/mount.h> 36 #include <linux/namei.h> 37 #include <linux/quotaops.h> 38 #include <linux/seq_file.h> 39 #include <linux/log2.h> 40 41 #include <asm/uaccess.h> 42 43 #include "xattr.h" 44 #include "acl.h" 45 #include "namei.h" 46 47 static int ext4_load_journal(struct super_block *, struct ext4_super_block *, 48 unsigned long journal_devnum); 49 static int ext4_create_journal(struct super_block *, struct ext4_super_block *, 50 unsigned int); 51 static void ext4_commit_super (struct super_block * sb, 52 struct ext4_super_block * es, 53 int sync); 54 static void ext4_mark_recovery_complete(struct super_block * sb, 55 struct ext4_super_block * es); 56 static void ext4_clear_journal_err(struct super_block * sb, 57 struct ext4_super_block * es); 58 static int ext4_sync_fs(struct super_block *sb, int wait); 59 static const char *ext4_decode_error(struct super_block * sb, int errno, 60 char nbuf[16]); 61 static int ext4_remount (struct super_block * sb, int * flags, char * data); 62 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf); 63 static void ext4_unlockfs(struct super_block *sb); 64 static void ext4_write_super (struct super_block * sb); 65 static void ext4_write_super_lockfs(struct super_block *sb); 66 67 68 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 69 struct ext4_group_desc *bg) 70 { 71 return le32_to_cpu(bg->bg_block_bitmap) | 72 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 73 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); 74 } 75 76 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 77 struct ext4_group_desc *bg) 78 { 79 return le32_to_cpu(bg->bg_inode_bitmap) | 80 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 81 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); 82 } 83 84 ext4_fsblk_t ext4_inode_table(struct super_block *sb, 85 struct ext4_group_desc *bg) 86 { 87 return le32_to_cpu(bg->bg_inode_table) | 88 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 89 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); 90 } 91 92 void ext4_block_bitmap_set(struct super_block *sb, 93 struct ext4_group_desc *bg, ext4_fsblk_t blk) 94 { 95 bg->bg_block_bitmap = cpu_to_le32((u32)blk); 96 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 97 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); 98 } 99 100 void ext4_inode_bitmap_set(struct super_block *sb, 101 struct ext4_group_desc *bg, ext4_fsblk_t blk) 102 { 103 bg->bg_inode_bitmap = cpu_to_le32((u32)blk); 104 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 105 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); 106 } 107 108 void ext4_inode_table_set(struct super_block *sb, 109 struct ext4_group_desc *bg, ext4_fsblk_t blk) 110 { 111 bg->bg_inode_table = cpu_to_le32((u32)blk); 112 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 113 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); 114 } 115 116 /* 117 * Wrappers for jbd2_journal_start/end. 118 * 119 * The only special thing we need to do here is to make sure that all 120 * journal_end calls result in the superblock being marked dirty, so 121 * that sync() will call the filesystem's write_super callback if 122 * appropriate. 123 */ 124 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) 125 { 126 journal_t *journal; 127 128 if (sb->s_flags & MS_RDONLY) 129 return ERR_PTR(-EROFS); 130 131 /* Special case here: if the journal has aborted behind our 132 * backs (eg. EIO in the commit thread), then we still need to 133 * take the FS itself readonly cleanly. */ 134 journal = EXT4_SB(sb)->s_journal; 135 if (is_journal_aborted(journal)) { 136 ext4_abort(sb, __FUNCTION__, 137 "Detected aborted journal"); 138 return ERR_PTR(-EROFS); 139 } 140 141 return jbd2_journal_start(journal, nblocks); 142 } 143 144 /* 145 * The only special thing we need to do here is to make sure that all 146 * jbd2_journal_stop calls result in the superblock being marked dirty, so 147 * that sync() will call the filesystem's write_super callback if 148 * appropriate. 149 */ 150 int __ext4_journal_stop(const char *where, handle_t *handle) 151 { 152 struct super_block *sb; 153 int err; 154 int rc; 155 156 sb = handle->h_transaction->t_journal->j_private; 157 err = handle->h_err; 158 rc = jbd2_journal_stop(handle); 159 160 if (!err) 161 err = rc; 162 if (err) 163 __ext4_std_error(sb, where, err); 164 return err; 165 } 166 167 void ext4_journal_abort_handle(const char *caller, const char *err_fn, 168 struct buffer_head *bh, handle_t *handle, int err) 169 { 170 char nbuf[16]; 171 const char *errstr = ext4_decode_error(NULL, err, nbuf); 172 173 if (bh) 174 BUFFER_TRACE(bh, "abort"); 175 176 if (!handle->h_err) 177 handle->h_err = err; 178 179 if (is_handle_aborted(handle)) 180 return; 181 182 printk(KERN_ERR "%s: aborting transaction: %s in %s\n", 183 caller, errstr, err_fn); 184 185 jbd2_journal_abort_handle(handle); 186 } 187 188 /* Deal with the reporting of failure conditions on a filesystem such as 189 * inconsistencies detected or read IO failures. 190 * 191 * On ext2, we can store the error state of the filesystem in the 192 * superblock. That is not possible on ext4, because we may have other 193 * write ordering constraints on the superblock which prevent us from 194 * writing it out straight away; and given that the journal is about to 195 * be aborted, we can't rely on the current, or future, transactions to 196 * write out the superblock safely. 197 * 198 * We'll just use the jbd2_journal_abort() error code to record an error in 199 * the journal instead. On recovery, the journal will compain about 200 * that error until we've noted it down and cleared it. 201 */ 202 203 static void ext4_handle_error(struct super_block *sb) 204 { 205 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 206 207 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 208 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 209 210 if (sb->s_flags & MS_RDONLY) 211 return; 212 213 if (!test_opt (sb, ERRORS_CONT)) { 214 journal_t *journal = EXT4_SB(sb)->s_journal; 215 216 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; 217 if (journal) 218 jbd2_journal_abort(journal, -EIO); 219 } 220 if (test_opt (sb, ERRORS_RO)) { 221 printk (KERN_CRIT "Remounting filesystem read-only\n"); 222 sb->s_flags |= MS_RDONLY; 223 } 224 ext4_commit_super(sb, es, 1); 225 if (test_opt(sb, ERRORS_PANIC)) 226 panic("EXT4-fs (device %s): panic forced after error\n", 227 sb->s_id); 228 } 229 230 void ext4_error (struct super_block * sb, const char * function, 231 const char * fmt, ...) 232 { 233 va_list args; 234 235 va_start(args, fmt); 236 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function); 237 vprintk(fmt, args); 238 printk("\n"); 239 va_end(args); 240 241 ext4_handle_error(sb); 242 } 243 244 static const char *ext4_decode_error(struct super_block * sb, int errno, 245 char nbuf[16]) 246 { 247 char *errstr = NULL; 248 249 switch (errno) { 250 case -EIO: 251 errstr = "IO failure"; 252 break; 253 case -ENOMEM: 254 errstr = "Out of memory"; 255 break; 256 case -EROFS: 257 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT) 258 errstr = "Journal has aborted"; 259 else 260 errstr = "Readonly filesystem"; 261 break; 262 default: 263 /* If the caller passed in an extra buffer for unknown 264 * errors, textualise them now. Else we just return 265 * NULL. */ 266 if (nbuf) { 267 /* Check for truncated error codes... */ 268 if (snprintf(nbuf, 16, "error %d", -errno) >= 0) 269 errstr = nbuf; 270 } 271 break; 272 } 273 274 return errstr; 275 } 276 277 /* __ext4_std_error decodes expected errors from journaling functions 278 * automatically and invokes the appropriate error response. */ 279 280 void __ext4_std_error (struct super_block * sb, const char * function, 281 int errno) 282 { 283 char nbuf[16]; 284 const char *errstr; 285 286 /* Special case: if the error is EROFS, and we're not already 287 * inside a transaction, then there's really no point in logging 288 * an error. */ 289 if (errno == -EROFS && journal_current_handle() == NULL && 290 (sb->s_flags & MS_RDONLY)) 291 return; 292 293 errstr = ext4_decode_error(sb, errno, nbuf); 294 printk (KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n", 295 sb->s_id, function, errstr); 296 297 ext4_handle_error(sb); 298 } 299 300 /* 301 * ext4_abort is a much stronger failure handler than ext4_error. The 302 * abort function may be used to deal with unrecoverable failures such 303 * as journal IO errors or ENOMEM at a critical moment in log management. 304 * 305 * We unconditionally force the filesystem into an ABORT|READONLY state, 306 * unless the error response on the fs has been set to panic in which 307 * case we take the easy way out and panic immediately. 308 */ 309 310 void ext4_abort (struct super_block * sb, const char * function, 311 const char * fmt, ...) 312 { 313 va_list args; 314 315 printk (KERN_CRIT "ext4_abort called.\n"); 316 317 va_start(args, fmt); 318 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function); 319 vprintk(fmt, args); 320 printk("\n"); 321 va_end(args); 322 323 if (test_opt(sb, ERRORS_PANIC)) 324 panic("EXT4-fs panic from previous error\n"); 325 326 if (sb->s_flags & MS_RDONLY) 327 return; 328 329 printk(KERN_CRIT "Remounting filesystem read-only\n"); 330 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 331 sb->s_flags |= MS_RDONLY; 332 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; 333 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); 334 } 335 336 void ext4_warning (struct super_block * sb, const char * function, 337 const char * fmt, ...) 338 { 339 va_list args; 340 341 va_start(args, fmt); 342 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ", 343 sb->s_id, function); 344 vprintk(fmt, args); 345 printk("\n"); 346 va_end(args); 347 } 348 349 void ext4_update_dynamic_rev(struct super_block *sb) 350 { 351 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 352 353 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) 354 return; 355 356 ext4_warning(sb, __FUNCTION__, 357 "updating to rev %d because of new feature flag, " 358 "running e2fsck is recommended", 359 EXT4_DYNAMIC_REV); 360 361 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); 362 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); 363 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); 364 /* leave es->s_feature_*compat flags alone */ 365 /* es->s_uuid will be set by e2fsck if empty */ 366 367 /* 368 * The rest of the superblock fields should be zero, and if not it 369 * means they are likely already in use, so leave them alone. We 370 * can leave it up to e2fsck to clean up any inconsistencies there. 371 */ 372 } 373 374 /* 375 * Open the external journal device 376 */ 377 static struct block_device *ext4_blkdev_get(dev_t dev) 378 { 379 struct block_device *bdev; 380 char b[BDEVNAME_SIZE]; 381 382 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); 383 if (IS_ERR(bdev)) 384 goto fail; 385 return bdev; 386 387 fail: 388 printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n", 389 __bdevname(dev, b), PTR_ERR(bdev)); 390 return NULL; 391 } 392 393 /* 394 * Release the journal device 395 */ 396 static int ext4_blkdev_put(struct block_device *bdev) 397 { 398 bd_release(bdev); 399 return blkdev_put(bdev); 400 } 401 402 static int ext4_blkdev_remove(struct ext4_sb_info *sbi) 403 { 404 struct block_device *bdev; 405 int ret = -ENODEV; 406 407 bdev = sbi->journal_bdev; 408 if (bdev) { 409 ret = ext4_blkdev_put(bdev); 410 sbi->journal_bdev = NULL; 411 } 412 return ret; 413 } 414 415 static inline struct inode *orphan_list_entry(struct list_head *l) 416 { 417 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; 418 } 419 420 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) 421 { 422 struct list_head *l; 423 424 printk(KERN_ERR "sb orphan head is %d\n", 425 le32_to_cpu(sbi->s_es->s_last_orphan)); 426 427 printk(KERN_ERR "sb_info orphan list:\n"); 428 list_for_each(l, &sbi->s_orphan) { 429 struct inode *inode = orphan_list_entry(l); 430 printk(KERN_ERR " " 431 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", 432 inode->i_sb->s_id, inode->i_ino, inode, 433 inode->i_mode, inode->i_nlink, 434 NEXT_ORPHAN(inode)); 435 } 436 } 437 438 static void ext4_put_super (struct super_block * sb) 439 { 440 struct ext4_sb_info *sbi = EXT4_SB(sb); 441 struct ext4_super_block *es = sbi->s_es; 442 int i; 443 444 ext4_ext_release(sb); 445 ext4_xattr_put_super(sb); 446 jbd2_journal_destroy(sbi->s_journal); 447 if (!(sb->s_flags & MS_RDONLY)) { 448 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 449 es->s_state = cpu_to_le16(sbi->s_mount_state); 450 BUFFER_TRACE(sbi->s_sbh, "marking dirty"); 451 mark_buffer_dirty(sbi->s_sbh); 452 ext4_commit_super(sb, es, 1); 453 } 454 455 for (i = 0; i < sbi->s_gdb_count; i++) 456 brelse(sbi->s_group_desc[i]); 457 kfree(sbi->s_group_desc); 458 percpu_counter_destroy(&sbi->s_freeblocks_counter); 459 percpu_counter_destroy(&sbi->s_freeinodes_counter); 460 percpu_counter_destroy(&sbi->s_dirs_counter); 461 brelse(sbi->s_sbh); 462 #ifdef CONFIG_QUOTA 463 for (i = 0; i < MAXQUOTAS; i++) 464 kfree(sbi->s_qf_names[i]); 465 #endif 466 467 /* Debugging code just in case the in-memory inode orphan list 468 * isn't empty. The on-disk one can be non-empty if we've 469 * detected an error and taken the fs readonly, but the 470 * in-memory list had better be clean by this point. */ 471 if (!list_empty(&sbi->s_orphan)) 472 dump_orphan_list(sb, sbi); 473 J_ASSERT(list_empty(&sbi->s_orphan)); 474 475 invalidate_bdev(sb->s_bdev); 476 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { 477 /* 478 * Invalidate the journal device's buffers. We don't want them 479 * floating about in memory - the physical journal device may 480 * hotswapped, and it breaks the `ro-after' testing code. 481 */ 482 sync_blockdev(sbi->journal_bdev); 483 invalidate_bdev(sbi->journal_bdev); 484 ext4_blkdev_remove(sbi); 485 } 486 sb->s_fs_info = NULL; 487 kfree(sbi); 488 return; 489 } 490 491 static struct kmem_cache *ext4_inode_cachep; 492 493 /* 494 * Called inside transaction, so use GFP_NOFS 495 */ 496 static struct inode *ext4_alloc_inode(struct super_block *sb) 497 { 498 struct ext4_inode_info *ei; 499 500 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); 501 if (!ei) 502 return NULL; 503 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 504 ei->i_acl = EXT4_ACL_NOT_CACHED; 505 ei->i_default_acl = EXT4_ACL_NOT_CACHED; 506 #endif 507 ei->i_block_alloc_info = NULL; 508 ei->vfs_inode.i_version = 1; 509 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); 510 return &ei->vfs_inode; 511 } 512 513 static void ext4_destroy_inode(struct inode *inode) 514 { 515 if (!list_empty(&(EXT4_I(inode)->i_orphan))) { 516 printk("EXT4 Inode %p: orphan list check failed!\n", 517 EXT4_I(inode)); 518 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, 519 EXT4_I(inode), sizeof(struct ext4_inode_info), 520 true); 521 dump_stack(); 522 } 523 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); 524 } 525 526 static void init_once(struct kmem_cache *cachep, void *foo) 527 { 528 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; 529 530 INIT_LIST_HEAD(&ei->i_orphan); 531 #ifdef CONFIG_EXT4DEV_FS_XATTR 532 init_rwsem(&ei->xattr_sem); 533 #endif 534 mutex_init(&ei->truncate_mutex); 535 inode_init_once(&ei->vfs_inode); 536 } 537 538 static int init_inodecache(void) 539 { 540 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", 541 sizeof(struct ext4_inode_info), 542 0, (SLAB_RECLAIM_ACCOUNT| 543 SLAB_MEM_SPREAD), 544 init_once); 545 if (ext4_inode_cachep == NULL) 546 return -ENOMEM; 547 return 0; 548 } 549 550 static void destroy_inodecache(void) 551 { 552 kmem_cache_destroy(ext4_inode_cachep); 553 } 554 555 static void ext4_clear_inode(struct inode *inode) 556 { 557 struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info; 558 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 559 if (EXT4_I(inode)->i_acl && 560 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) { 561 posix_acl_release(EXT4_I(inode)->i_acl); 562 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED; 563 } 564 if (EXT4_I(inode)->i_default_acl && 565 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) { 566 posix_acl_release(EXT4_I(inode)->i_default_acl); 567 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED; 568 } 569 #endif 570 ext4_discard_reservation(inode); 571 EXT4_I(inode)->i_block_alloc_info = NULL; 572 if (unlikely(rsv)) 573 kfree(rsv); 574 } 575 576 static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb) 577 { 578 #if defined(CONFIG_QUOTA) 579 struct ext4_sb_info *sbi = EXT4_SB(sb); 580 581 if (sbi->s_jquota_fmt) 582 seq_printf(seq, ",jqfmt=%s", 583 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0"); 584 585 if (sbi->s_qf_names[USRQUOTA]) 586 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); 587 588 if (sbi->s_qf_names[GRPQUOTA]) 589 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); 590 591 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) 592 seq_puts(seq, ",usrquota"); 593 594 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) 595 seq_puts(seq, ",grpquota"); 596 #endif 597 } 598 599 /* 600 * Show an option if 601 * - it's set to a non-default value OR 602 * - if the per-sb default is different from the global default 603 */ 604 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs) 605 { 606 struct super_block *sb = vfs->mnt_sb; 607 struct ext4_sb_info *sbi = EXT4_SB(sb); 608 struct ext4_super_block *es = sbi->s_es; 609 unsigned long def_mount_opts; 610 611 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 612 613 if (sbi->s_sb_block != 1) 614 seq_printf(seq, ",sb=%llu", sbi->s_sb_block); 615 if (test_opt(sb, MINIX_DF)) 616 seq_puts(seq, ",minixdf"); 617 if (test_opt(sb, GRPID)) 618 seq_puts(seq, ",grpid"); 619 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS)) 620 seq_puts(seq, ",nogrpid"); 621 if (sbi->s_resuid != EXT4_DEF_RESUID || 622 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) { 623 seq_printf(seq, ",resuid=%u", sbi->s_resuid); 624 } 625 if (sbi->s_resgid != EXT4_DEF_RESGID || 626 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) { 627 seq_printf(seq, ",resgid=%u", sbi->s_resgid); 628 } 629 if (test_opt(sb, ERRORS_CONT)) { 630 int def_errors = le16_to_cpu(es->s_errors); 631 632 if (def_errors == EXT4_ERRORS_PANIC || 633 def_errors == EXT4_ERRORS_RO) { 634 seq_puts(seq, ",errors=continue"); 635 } 636 } 637 if (test_opt(sb, ERRORS_RO)) 638 seq_puts(seq, ",errors=remount-ro"); 639 if (test_opt(sb, ERRORS_PANIC)) 640 seq_puts(seq, ",errors=panic"); 641 if (test_opt(sb, NO_UID32)) 642 seq_puts(seq, ",nouid32"); 643 if (test_opt(sb, DEBUG)) 644 seq_puts(seq, ",debug"); 645 if (test_opt(sb, OLDALLOC)) 646 seq_puts(seq, ",oldalloc"); 647 #ifdef CONFIG_EXT4_FS_XATTR 648 if (test_opt(sb, XATTR_USER)) 649 seq_puts(seq, ",user_xattr"); 650 if (!test_opt(sb, XATTR_USER) && 651 (def_mount_opts & EXT4_DEFM_XATTR_USER)) { 652 seq_puts(seq, ",nouser_xattr"); 653 } 654 #endif 655 #ifdef CONFIG_EXT4_FS_POSIX_ACL 656 if (test_opt(sb, POSIX_ACL)) 657 seq_puts(seq, ",acl"); 658 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL)) 659 seq_puts(seq, ",noacl"); 660 #endif 661 if (!test_opt(sb, RESERVATION)) 662 seq_puts(seq, ",noreservation"); 663 if (sbi->s_commit_interval) { 664 seq_printf(seq, ",commit=%u", 665 (unsigned) (sbi->s_commit_interval / HZ)); 666 } 667 if (test_opt(sb, BARRIER)) 668 seq_puts(seq, ",barrier=1"); 669 if (test_opt(sb, NOBH)) 670 seq_puts(seq, ",nobh"); 671 if (!test_opt(sb, EXTENTS)) 672 seq_puts(seq, ",noextents"); 673 674 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 675 seq_puts(seq, ",data=journal"); 676 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 677 seq_puts(seq, ",data=ordered"); 678 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) 679 seq_puts(seq, ",data=writeback"); 680 681 ext4_show_quota_options(seq, sb); 682 683 return 0; 684 } 685 686 687 static struct dentry *ext4_get_dentry(struct super_block *sb, void *vobjp) 688 { 689 __u32 *objp = vobjp; 690 unsigned long ino = objp[0]; 691 __u32 generation = objp[1]; 692 struct inode *inode; 693 struct dentry *result; 694 695 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) 696 return ERR_PTR(-ESTALE); 697 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) 698 return ERR_PTR(-ESTALE); 699 700 /* iget isn't really right if the inode is currently unallocated!! 701 * 702 * ext4_read_inode will return a bad_inode if the inode had been 703 * deleted, so we should be safe. 704 * 705 * Currently we don't know the generation for parent directory, so 706 * a generation of 0 means "accept any" 707 */ 708 inode = iget(sb, ino); 709 if (inode == NULL) 710 return ERR_PTR(-ENOMEM); 711 if (is_bad_inode(inode) || 712 (generation && inode->i_generation != generation)) { 713 iput(inode); 714 return ERR_PTR(-ESTALE); 715 } 716 /* now to find a dentry. 717 * If possible, get a well-connected one 718 */ 719 result = d_alloc_anon(inode); 720 if (!result) { 721 iput(inode); 722 return ERR_PTR(-ENOMEM); 723 } 724 return result; 725 } 726 727 #ifdef CONFIG_QUOTA 728 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group") 729 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) 730 731 static int ext4_dquot_initialize(struct inode *inode, int type); 732 static int ext4_dquot_drop(struct inode *inode); 733 static int ext4_write_dquot(struct dquot *dquot); 734 static int ext4_acquire_dquot(struct dquot *dquot); 735 static int ext4_release_dquot(struct dquot *dquot); 736 static int ext4_mark_dquot_dirty(struct dquot *dquot); 737 static int ext4_write_info(struct super_block *sb, int type); 738 static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path); 739 static int ext4_quota_on_mount(struct super_block *sb, int type); 740 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 741 size_t len, loff_t off); 742 static ssize_t ext4_quota_write(struct super_block *sb, int type, 743 const char *data, size_t len, loff_t off); 744 745 static struct dquot_operations ext4_quota_operations = { 746 .initialize = ext4_dquot_initialize, 747 .drop = ext4_dquot_drop, 748 .alloc_space = dquot_alloc_space, 749 .alloc_inode = dquot_alloc_inode, 750 .free_space = dquot_free_space, 751 .free_inode = dquot_free_inode, 752 .transfer = dquot_transfer, 753 .write_dquot = ext4_write_dquot, 754 .acquire_dquot = ext4_acquire_dquot, 755 .release_dquot = ext4_release_dquot, 756 .mark_dirty = ext4_mark_dquot_dirty, 757 .write_info = ext4_write_info 758 }; 759 760 static struct quotactl_ops ext4_qctl_operations = { 761 .quota_on = ext4_quota_on, 762 .quota_off = vfs_quota_off, 763 .quota_sync = vfs_quota_sync, 764 .get_info = vfs_get_dqinfo, 765 .set_info = vfs_set_dqinfo, 766 .get_dqblk = vfs_get_dqblk, 767 .set_dqblk = vfs_set_dqblk 768 }; 769 #endif 770 771 static const struct super_operations ext4_sops = { 772 .alloc_inode = ext4_alloc_inode, 773 .destroy_inode = ext4_destroy_inode, 774 .read_inode = ext4_read_inode, 775 .write_inode = ext4_write_inode, 776 .dirty_inode = ext4_dirty_inode, 777 .delete_inode = ext4_delete_inode, 778 .put_super = ext4_put_super, 779 .write_super = ext4_write_super, 780 .sync_fs = ext4_sync_fs, 781 .write_super_lockfs = ext4_write_super_lockfs, 782 .unlockfs = ext4_unlockfs, 783 .statfs = ext4_statfs, 784 .remount_fs = ext4_remount, 785 .clear_inode = ext4_clear_inode, 786 .show_options = ext4_show_options, 787 #ifdef CONFIG_QUOTA 788 .quota_read = ext4_quota_read, 789 .quota_write = ext4_quota_write, 790 #endif 791 }; 792 793 static struct export_operations ext4_export_ops = { 794 .get_parent = ext4_get_parent, 795 .get_dentry = ext4_get_dentry, 796 }; 797 798 enum { 799 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 800 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, 801 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov, 802 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, 803 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh, 804 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev, 805 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, 806 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, 807 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota, 808 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota, 809 Opt_grpquota, Opt_extents, Opt_noextents, 810 }; 811 812 static match_table_t tokens = { 813 {Opt_bsd_df, "bsddf"}, 814 {Opt_minix_df, "minixdf"}, 815 {Opt_grpid, "grpid"}, 816 {Opt_grpid, "bsdgroups"}, 817 {Opt_nogrpid, "nogrpid"}, 818 {Opt_nogrpid, "sysvgroups"}, 819 {Opt_resgid, "resgid=%u"}, 820 {Opt_resuid, "resuid=%u"}, 821 {Opt_sb, "sb=%u"}, 822 {Opt_err_cont, "errors=continue"}, 823 {Opt_err_panic, "errors=panic"}, 824 {Opt_err_ro, "errors=remount-ro"}, 825 {Opt_nouid32, "nouid32"}, 826 {Opt_nocheck, "nocheck"}, 827 {Opt_nocheck, "check=none"}, 828 {Opt_debug, "debug"}, 829 {Opt_oldalloc, "oldalloc"}, 830 {Opt_orlov, "orlov"}, 831 {Opt_user_xattr, "user_xattr"}, 832 {Opt_nouser_xattr, "nouser_xattr"}, 833 {Opt_acl, "acl"}, 834 {Opt_noacl, "noacl"}, 835 {Opt_reservation, "reservation"}, 836 {Opt_noreservation, "noreservation"}, 837 {Opt_noload, "noload"}, 838 {Opt_nobh, "nobh"}, 839 {Opt_bh, "bh"}, 840 {Opt_commit, "commit=%u"}, 841 {Opt_journal_update, "journal=update"}, 842 {Opt_journal_inum, "journal=%u"}, 843 {Opt_journal_dev, "journal_dev=%u"}, 844 {Opt_abort, "abort"}, 845 {Opt_data_journal, "data=journal"}, 846 {Opt_data_ordered, "data=ordered"}, 847 {Opt_data_writeback, "data=writeback"}, 848 {Opt_offusrjquota, "usrjquota="}, 849 {Opt_usrjquota, "usrjquota=%s"}, 850 {Opt_offgrpjquota, "grpjquota="}, 851 {Opt_grpjquota, "grpjquota=%s"}, 852 {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, 853 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, 854 {Opt_grpquota, "grpquota"}, 855 {Opt_noquota, "noquota"}, 856 {Opt_quota, "quota"}, 857 {Opt_usrquota, "usrquota"}, 858 {Opt_barrier, "barrier=%u"}, 859 {Opt_extents, "extents"}, 860 {Opt_noextents, "noextents"}, 861 {Opt_err, NULL}, 862 {Opt_resize, "resize"}, 863 }; 864 865 static ext4_fsblk_t get_sb_block(void **data) 866 { 867 ext4_fsblk_t sb_block; 868 char *options = (char *) *data; 869 870 if (!options || strncmp(options, "sb=", 3) != 0) 871 return 1; /* Default location */ 872 options += 3; 873 /*todo: use simple_strtoll with >32bit ext4 */ 874 sb_block = simple_strtoul(options, &options, 0); 875 if (*options && *options != ',') { 876 printk("EXT4-fs: Invalid sb specification: %s\n", 877 (char *) *data); 878 return 1; 879 } 880 if (*options == ',') 881 options++; 882 *data = (void *) options; 883 return sb_block; 884 } 885 886 static int parse_options (char *options, struct super_block *sb, 887 unsigned int *inum, unsigned long *journal_devnum, 888 ext4_fsblk_t *n_blocks_count, int is_remount) 889 { 890 struct ext4_sb_info *sbi = EXT4_SB(sb); 891 char * p; 892 substring_t args[MAX_OPT_ARGS]; 893 int data_opt = 0; 894 int option; 895 #ifdef CONFIG_QUOTA 896 int qtype; 897 char *qname; 898 #endif 899 900 if (!options) 901 return 1; 902 903 while ((p = strsep (&options, ",")) != NULL) { 904 int token; 905 if (!*p) 906 continue; 907 908 token = match_token(p, tokens, args); 909 switch (token) { 910 case Opt_bsd_df: 911 clear_opt (sbi->s_mount_opt, MINIX_DF); 912 break; 913 case Opt_minix_df: 914 set_opt (sbi->s_mount_opt, MINIX_DF); 915 break; 916 case Opt_grpid: 917 set_opt (sbi->s_mount_opt, GRPID); 918 break; 919 case Opt_nogrpid: 920 clear_opt (sbi->s_mount_opt, GRPID); 921 break; 922 case Opt_resuid: 923 if (match_int(&args[0], &option)) 924 return 0; 925 sbi->s_resuid = option; 926 break; 927 case Opt_resgid: 928 if (match_int(&args[0], &option)) 929 return 0; 930 sbi->s_resgid = option; 931 break; 932 case Opt_sb: 933 /* handled by get_sb_block() instead of here */ 934 /* *sb_block = match_int(&args[0]); */ 935 break; 936 case Opt_err_panic: 937 clear_opt (sbi->s_mount_opt, ERRORS_CONT); 938 clear_opt (sbi->s_mount_opt, ERRORS_RO); 939 set_opt (sbi->s_mount_opt, ERRORS_PANIC); 940 break; 941 case Opt_err_ro: 942 clear_opt (sbi->s_mount_opt, ERRORS_CONT); 943 clear_opt (sbi->s_mount_opt, ERRORS_PANIC); 944 set_opt (sbi->s_mount_opt, ERRORS_RO); 945 break; 946 case Opt_err_cont: 947 clear_opt (sbi->s_mount_opt, ERRORS_RO); 948 clear_opt (sbi->s_mount_opt, ERRORS_PANIC); 949 set_opt (sbi->s_mount_opt, ERRORS_CONT); 950 break; 951 case Opt_nouid32: 952 set_opt (sbi->s_mount_opt, NO_UID32); 953 break; 954 case Opt_nocheck: 955 clear_opt (sbi->s_mount_opt, CHECK); 956 break; 957 case Opt_debug: 958 set_opt (sbi->s_mount_opt, DEBUG); 959 break; 960 case Opt_oldalloc: 961 set_opt (sbi->s_mount_opt, OLDALLOC); 962 break; 963 case Opt_orlov: 964 clear_opt (sbi->s_mount_opt, OLDALLOC); 965 break; 966 #ifdef CONFIG_EXT4DEV_FS_XATTR 967 case Opt_user_xattr: 968 set_opt (sbi->s_mount_opt, XATTR_USER); 969 break; 970 case Opt_nouser_xattr: 971 clear_opt (sbi->s_mount_opt, XATTR_USER); 972 break; 973 #else 974 case Opt_user_xattr: 975 case Opt_nouser_xattr: 976 printk("EXT4 (no)user_xattr options not supported\n"); 977 break; 978 #endif 979 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 980 case Opt_acl: 981 set_opt(sbi->s_mount_opt, POSIX_ACL); 982 break; 983 case Opt_noacl: 984 clear_opt(sbi->s_mount_opt, POSIX_ACL); 985 break; 986 #else 987 case Opt_acl: 988 case Opt_noacl: 989 printk("EXT4 (no)acl options not supported\n"); 990 break; 991 #endif 992 case Opt_reservation: 993 set_opt(sbi->s_mount_opt, RESERVATION); 994 break; 995 case Opt_noreservation: 996 clear_opt(sbi->s_mount_opt, RESERVATION); 997 break; 998 case Opt_journal_update: 999 /* @@@ FIXME */ 1000 /* Eventually we will want to be able to create 1001 a journal file here. For now, only allow the 1002 user to specify an existing inode to be the 1003 journal file. */ 1004 if (is_remount) { 1005 printk(KERN_ERR "EXT4-fs: cannot specify " 1006 "journal on remount\n"); 1007 return 0; 1008 } 1009 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL); 1010 break; 1011 case Opt_journal_inum: 1012 if (is_remount) { 1013 printk(KERN_ERR "EXT4-fs: cannot specify " 1014 "journal on remount\n"); 1015 return 0; 1016 } 1017 if (match_int(&args[0], &option)) 1018 return 0; 1019 *inum = option; 1020 break; 1021 case Opt_journal_dev: 1022 if (is_remount) { 1023 printk(KERN_ERR "EXT4-fs: cannot specify " 1024 "journal on remount\n"); 1025 return 0; 1026 } 1027 if (match_int(&args[0], &option)) 1028 return 0; 1029 *journal_devnum = option; 1030 break; 1031 case Opt_noload: 1032 set_opt (sbi->s_mount_opt, NOLOAD); 1033 break; 1034 case Opt_commit: 1035 if (match_int(&args[0], &option)) 1036 return 0; 1037 if (option < 0) 1038 return 0; 1039 if (option == 0) 1040 option = JBD_DEFAULT_MAX_COMMIT_AGE; 1041 sbi->s_commit_interval = HZ * option; 1042 break; 1043 case Opt_data_journal: 1044 data_opt = EXT4_MOUNT_JOURNAL_DATA; 1045 goto datacheck; 1046 case Opt_data_ordered: 1047 data_opt = EXT4_MOUNT_ORDERED_DATA; 1048 goto datacheck; 1049 case Opt_data_writeback: 1050 data_opt = EXT4_MOUNT_WRITEBACK_DATA; 1051 datacheck: 1052 if (is_remount) { 1053 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS) 1054 != data_opt) { 1055 printk(KERN_ERR 1056 "EXT4-fs: cannot change data " 1057 "mode on remount\n"); 1058 return 0; 1059 } 1060 } else { 1061 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS; 1062 sbi->s_mount_opt |= data_opt; 1063 } 1064 break; 1065 #ifdef CONFIG_QUOTA 1066 case Opt_usrjquota: 1067 qtype = USRQUOTA; 1068 goto set_qf_name; 1069 case Opt_grpjquota: 1070 qtype = GRPQUOTA; 1071 set_qf_name: 1072 if (sb_any_quota_enabled(sb)) { 1073 printk(KERN_ERR 1074 "EXT4-fs: Cannot change journalled " 1075 "quota options when quota turned on.\n"); 1076 return 0; 1077 } 1078 qname = match_strdup(&args[0]); 1079 if (!qname) { 1080 printk(KERN_ERR 1081 "EXT4-fs: not enough memory for " 1082 "storing quotafile name.\n"); 1083 return 0; 1084 } 1085 if (sbi->s_qf_names[qtype] && 1086 strcmp(sbi->s_qf_names[qtype], qname)) { 1087 printk(KERN_ERR 1088 "EXT4-fs: %s quota file already " 1089 "specified.\n", QTYPE2NAME(qtype)); 1090 kfree(qname); 1091 return 0; 1092 } 1093 sbi->s_qf_names[qtype] = qname; 1094 if (strchr(sbi->s_qf_names[qtype], '/')) { 1095 printk(KERN_ERR 1096 "EXT4-fs: quotafile must be on " 1097 "filesystem root.\n"); 1098 kfree(sbi->s_qf_names[qtype]); 1099 sbi->s_qf_names[qtype] = NULL; 1100 return 0; 1101 } 1102 set_opt(sbi->s_mount_opt, QUOTA); 1103 break; 1104 case Opt_offusrjquota: 1105 qtype = USRQUOTA; 1106 goto clear_qf_name; 1107 case Opt_offgrpjquota: 1108 qtype = GRPQUOTA; 1109 clear_qf_name: 1110 if (sb_any_quota_enabled(sb)) { 1111 printk(KERN_ERR "EXT4-fs: Cannot change " 1112 "journalled quota options when " 1113 "quota turned on.\n"); 1114 return 0; 1115 } 1116 /* 1117 * The space will be released later when all options 1118 * are confirmed to be correct 1119 */ 1120 sbi->s_qf_names[qtype] = NULL; 1121 break; 1122 case Opt_jqfmt_vfsold: 1123 sbi->s_jquota_fmt = QFMT_VFS_OLD; 1124 break; 1125 case Opt_jqfmt_vfsv0: 1126 sbi->s_jquota_fmt = QFMT_VFS_V0; 1127 break; 1128 case Opt_quota: 1129 case Opt_usrquota: 1130 set_opt(sbi->s_mount_opt, QUOTA); 1131 set_opt(sbi->s_mount_opt, USRQUOTA); 1132 break; 1133 case Opt_grpquota: 1134 set_opt(sbi->s_mount_opt, QUOTA); 1135 set_opt(sbi->s_mount_opt, GRPQUOTA); 1136 break; 1137 case Opt_noquota: 1138 if (sb_any_quota_enabled(sb)) { 1139 printk(KERN_ERR "EXT4-fs: Cannot change quota " 1140 "options when quota turned on.\n"); 1141 return 0; 1142 } 1143 clear_opt(sbi->s_mount_opt, QUOTA); 1144 clear_opt(sbi->s_mount_opt, USRQUOTA); 1145 clear_opt(sbi->s_mount_opt, GRPQUOTA); 1146 break; 1147 #else 1148 case Opt_quota: 1149 case Opt_usrquota: 1150 case Opt_grpquota: 1151 case Opt_usrjquota: 1152 case Opt_grpjquota: 1153 case Opt_offusrjquota: 1154 case Opt_offgrpjquota: 1155 case Opt_jqfmt_vfsold: 1156 case Opt_jqfmt_vfsv0: 1157 printk(KERN_ERR 1158 "EXT4-fs: journalled quota options not " 1159 "supported.\n"); 1160 break; 1161 case Opt_noquota: 1162 break; 1163 #endif 1164 case Opt_abort: 1165 set_opt(sbi->s_mount_opt, ABORT); 1166 break; 1167 case Opt_barrier: 1168 if (match_int(&args[0], &option)) 1169 return 0; 1170 if (option) 1171 set_opt(sbi->s_mount_opt, BARRIER); 1172 else 1173 clear_opt(sbi->s_mount_opt, BARRIER); 1174 break; 1175 case Opt_ignore: 1176 break; 1177 case Opt_resize: 1178 if (!is_remount) { 1179 printk("EXT4-fs: resize option only available " 1180 "for remount\n"); 1181 return 0; 1182 } 1183 if (match_int(&args[0], &option) != 0) 1184 return 0; 1185 *n_blocks_count = option; 1186 break; 1187 case Opt_nobh: 1188 set_opt(sbi->s_mount_opt, NOBH); 1189 break; 1190 case Opt_bh: 1191 clear_opt(sbi->s_mount_opt, NOBH); 1192 break; 1193 case Opt_extents: 1194 set_opt (sbi->s_mount_opt, EXTENTS); 1195 break; 1196 case Opt_noextents: 1197 clear_opt (sbi->s_mount_opt, EXTENTS); 1198 break; 1199 default: 1200 printk (KERN_ERR 1201 "EXT4-fs: Unrecognized mount option \"%s\" " 1202 "or missing value\n", p); 1203 return 0; 1204 } 1205 } 1206 #ifdef CONFIG_QUOTA 1207 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { 1208 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) && 1209 sbi->s_qf_names[USRQUOTA]) 1210 clear_opt(sbi->s_mount_opt, USRQUOTA); 1211 1212 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) && 1213 sbi->s_qf_names[GRPQUOTA]) 1214 clear_opt(sbi->s_mount_opt, GRPQUOTA); 1215 1216 if ((sbi->s_qf_names[USRQUOTA] && 1217 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) || 1218 (sbi->s_qf_names[GRPQUOTA] && 1219 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) { 1220 printk(KERN_ERR "EXT4-fs: old and new quota " 1221 "format mixing.\n"); 1222 return 0; 1223 } 1224 1225 if (!sbi->s_jquota_fmt) { 1226 printk(KERN_ERR "EXT4-fs: journalled quota format " 1227 "not specified.\n"); 1228 return 0; 1229 } 1230 } else { 1231 if (sbi->s_jquota_fmt) { 1232 printk(KERN_ERR "EXT4-fs: journalled quota format " 1233 "specified with no journalling " 1234 "enabled.\n"); 1235 return 0; 1236 } 1237 } 1238 #endif 1239 return 1; 1240 } 1241 1242 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, 1243 int read_only) 1244 { 1245 struct ext4_sb_info *sbi = EXT4_SB(sb); 1246 int res = 0; 1247 1248 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { 1249 printk (KERN_ERR "EXT4-fs warning: revision level too high, " 1250 "forcing read-only mode\n"); 1251 res = MS_RDONLY; 1252 } 1253 if (read_only) 1254 return res; 1255 if (!(sbi->s_mount_state & EXT4_VALID_FS)) 1256 printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, " 1257 "running e2fsck is recommended\n"); 1258 else if ((sbi->s_mount_state & EXT4_ERROR_FS)) 1259 printk (KERN_WARNING 1260 "EXT4-fs warning: mounting fs with errors, " 1261 "running e2fsck is recommended\n"); 1262 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 1263 le16_to_cpu(es->s_mnt_count) >= 1264 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 1265 printk (KERN_WARNING 1266 "EXT4-fs warning: maximal mount count reached, " 1267 "running e2fsck is recommended\n"); 1268 else if (le32_to_cpu(es->s_checkinterval) && 1269 (le32_to_cpu(es->s_lastcheck) + 1270 le32_to_cpu(es->s_checkinterval) <= get_seconds())) 1271 printk (KERN_WARNING 1272 "EXT4-fs warning: checktime reached, " 1273 "running e2fsck is recommended\n"); 1274 #if 0 1275 /* @@@ We _will_ want to clear the valid bit if we find 1276 * inconsistencies, to force a fsck at reboot. But for 1277 * a plain journaled filesystem we can keep it set as 1278 * valid forever! :) 1279 */ 1280 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS); 1281 #endif 1282 if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) 1283 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); 1284 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1); 1285 es->s_mtime = cpu_to_le32(get_seconds()); 1286 ext4_update_dynamic_rev(sb); 1287 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 1288 1289 ext4_commit_super(sb, es, 1); 1290 if (test_opt(sb, DEBUG)) 1291 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, " 1292 "bpg=%lu, ipg=%lu, mo=%04lx]\n", 1293 sb->s_blocksize, 1294 sbi->s_groups_count, 1295 EXT4_BLOCKS_PER_GROUP(sb), 1296 EXT4_INODES_PER_GROUP(sb), 1297 sbi->s_mount_opt); 1298 1299 printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id); 1300 if (EXT4_SB(sb)->s_journal->j_inode == NULL) { 1301 char b[BDEVNAME_SIZE]; 1302 1303 printk("external journal on %s\n", 1304 bdevname(EXT4_SB(sb)->s_journal->j_dev, b)); 1305 } else { 1306 printk("internal journal\n"); 1307 } 1308 return res; 1309 } 1310 1311 /* Called at mount-time, super-block is locked */ 1312 static int ext4_check_descriptors (struct super_block * sb) 1313 { 1314 struct ext4_sb_info *sbi = EXT4_SB(sb); 1315 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); 1316 ext4_fsblk_t last_block; 1317 ext4_fsblk_t block_bitmap; 1318 ext4_fsblk_t inode_bitmap; 1319 ext4_fsblk_t inode_table; 1320 struct ext4_group_desc * gdp = NULL; 1321 int desc_block = 0; 1322 int i; 1323 1324 ext4_debug ("Checking group descriptors"); 1325 1326 for (i = 0; i < sbi->s_groups_count; i++) 1327 { 1328 if (i == sbi->s_groups_count - 1) 1329 last_block = ext4_blocks_count(sbi->s_es) - 1; 1330 else 1331 last_block = first_block + 1332 (EXT4_BLOCKS_PER_GROUP(sb) - 1); 1333 1334 if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0) 1335 gdp = (struct ext4_group_desc *) 1336 sbi->s_group_desc[desc_block++]->b_data; 1337 block_bitmap = ext4_block_bitmap(sb, gdp); 1338 if (block_bitmap < first_block || block_bitmap > last_block) 1339 { 1340 ext4_error (sb, "ext4_check_descriptors", 1341 "Block bitmap for group %d" 1342 " not in group (block %llu)!", 1343 i, block_bitmap); 1344 return 0; 1345 } 1346 inode_bitmap = ext4_inode_bitmap(sb, gdp); 1347 if (inode_bitmap < first_block || inode_bitmap > last_block) 1348 { 1349 ext4_error (sb, "ext4_check_descriptors", 1350 "Inode bitmap for group %d" 1351 " not in group (block %llu)!", 1352 i, inode_bitmap); 1353 return 0; 1354 } 1355 inode_table = ext4_inode_table(sb, gdp); 1356 if (inode_table < first_block || 1357 inode_table + sbi->s_itb_per_group - 1 > last_block) 1358 { 1359 ext4_error (sb, "ext4_check_descriptors", 1360 "Inode table for group %d" 1361 " not in group (block %llu)!", 1362 i, inode_table); 1363 return 0; 1364 } 1365 first_block += EXT4_BLOCKS_PER_GROUP(sb); 1366 gdp = (struct ext4_group_desc *) 1367 ((__u8 *)gdp + EXT4_DESC_SIZE(sb)); 1368 } 1369 1370 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb)); 1371 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb)); 1372 return 1; 1373 } 1374 1375 1376 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at 1377 * the superblock) which were deleted from all directories, but held open by 1378 * a process at the time of a crash. We walk the list and try to delete these 1379 * inodes at recovery time (only with a read-write filesystem). 1380 * 1381 * In order to keep the orphan inode chain consistent during traversal (in 1382 * case of crash during recovery), we link each inode into the superblock 1383 * orphan list_head and handle it the same way as an inode deletion during 1384 * normal operation (which journals the operations for us). 1385 * 1386 * We only do an iget() and an iput() on each inode, which is very safe if we 1387 * accidentally point at an in-use or already deleted inode. The worst that 1388 * can happen in this case is that we get a "bit already cleared" message from 1389 * ext4_free_inode(). The only reason we would point at a wrong inode is if 1390 * e2fsck was run on this filesystem, and it must have already done the orphan 1391 * inode cleanup for us, so we can safely abort without any further action. 1392 */ 1393 static void ext4_orphan_cleanup (struct super_block * sb, 1394 struct ext4_super_block * es) 1395 { 1396 unsigned int s_flags = sb->s_flags; 1397 int nr_orphans = 0, nr_truncates = 0; 1398 #ifdef CONFIG_QUOTA 1399 int i; 1400 #endif 1401 if (!es->s_last_orphan) { 1402 jbd_debug(4, "no orphan inodes to clean up\n"); 1403 return; 1404 } 1405 1406 if (bdev_read_only(sb->s_bdev)) { 1407 printk(KERN_ERR "EXT4-fs: write access " 1408 "unavailable, skipping orphan cleanup.\n"); 1409 return; 1410 } 1411 1412 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { 1413 if (es->s_last_orphan) 1414 jbd_debug(1, "Errors on filesystem, " 1415 "clearing orphan list.\n"); 1416 es->s_last_orphan = 0; 1417 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); 1418 return; 1419 } 1420 1421 if (s_flags & MS_RDONLY) { 1422 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n", 1423 sb->s_id); 1424 sb->s_flags &= ~MS_RDONLY; 1425 } 1426 #ifdef CONFIG_QUOTA 1427 /* Needed for iput() to work correctly and not trash data */ 1428 sb->s_flags |= MS_ACTIVE; 1429 /* Turn on quotas so that they are updated correctly */ 1430 for (i = 0; i < MAXQUOTAS; i++) { 1431 if (EXT4_SB(sb)->s_qf_names[i]) { 1432 int ret = ext4_quota_on_mount(sb, i); 1433 if (ret < 0) 1434 printk(KERN_ERR 1435 "EXT4-fs: Cannot turn on journalled " 1436 "quota: error %d\n", ret); 1437 } 1438 } 1439 #endif 1440 1441 while (es->s_last_orphan) { 1442 struct inode *inode; 1443 1444 if (!(inode = 1445 ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) { 1446 es->s_last_orphan = 0; 1447 break; 1448 } 1449 1450 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); 1451 DQUOT_INIT(inode); 1452 if (inode->i_nlink) { 1453 printk(KERN_DEBUG 1454 "%s: truncating inode %lu to %Ld bytes\n", 1455 __FUNCTION__, inode->i_ino, inode->i_size); 1456 jbd_debug(2, "truncating inode %lu to %Ld bytes\n", 1457 inode->i_ino, inode->i_size); 1458 ext4_truncate(inode); 1459 nr_truncates++; 1460 } else { 1461 printk(KERN_DEBUG 1462 "%s: deleting unreferenced inode %lu\n", 1463 __FUNCTION__, inode->i_ino); 1464 jbd_debug(2, "deleting unreferenced inode %lu\n", 1465 inode->i_ino); 1466 nr_orphans++; 1467 } 1468 iput(inode); /* The delete magic happens here! */ 1469 } 1470 1471 #define PLURAL(x) (x), ((x)==1) ? "" : "s" 1472 1473 if (nr_orphans) 1474 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n", 1475 sb->s_id, PLURAL(nr_orphans)); 1476 if (nr_truncates) 1477 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n", 1478 sb->s_id, PLURAL(nr_truncates)); 1479 #ifdef CONFIG_QUOTA 1480 /* Turn quotas off */ 1481 for (i = 0; i < MAXQUOTAS; i++) { 1482 if (sb_dqopt(sb)->files[i]) 1483 vfs_quota_off(sb, i); 1484 } 1485 #endif 1486 sb->s_flags = s_flags; /* Restore MS_RDONLY status */ 1487 } 1488 1489 /* 1490 * Maximal file size. There is a direct, and {,double-,triple-}indirect 1491 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. 1492 * We need to be 1 filesystem block less than the 2^32 sector limit. 1493 */ 1494 static loff_t ext4_max_size(int bits) 1495 { 1496 loff_t res = EXT4_NDIR_BLOCKS; 1497 /* This constant is calculated to be the largest file size for a 1498 * dense, 4k-blocksize file such that the total number of 1499 * sectors in the file, including data and all indirect blocks, 1500 * does not exceed 2^32. */ 1501 const loff_t upper_limit = 0x1ff7fffd000LL; 1502 1503 res += 1LL << (bits-2); 1504 res += 1LL << (2*(bits-2)); 1505 res += 1LL << (3*(bits-2)); 1506 res <<= bits; 1507 if (res > upper_limit) 1508 res = upper_limit; 1509 return res; 1510 } 1511 1512 static ext4_fsblk_t descriptor_loc(struct super_block *sb, 1513 ext4_fsblk_t logical_sb_block, int nr) 1514 { 1515 struct ext4_sb_info *sbi = EXT4_SB(sb); 1516 unsigned long bg, first_meta_bg; 1517 int has_super = 0; 1518 1519 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 1520 1521 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || 1522 nr < first_meta_bg) 1523 return logical_sb_block + nr + 1; 1524 bg = sbi->s_desc_per_block * nr; 1525 if (ext4_bg_has_super(sb, bg)) 1526 has_super = 1; 1527 return (has_super + ext4_group_first_block_no(sb, bg)); 1528 } 1529 1530 1531 static int ext4_fill_super (struct super_block *sb, void *data, int silent) 1532 { 1533 struct buffer_head * bh; 1534 struct ext4_super_block *es = NULL; 1535 struct ext4_sb_info *sbi; 1536 ext4_fsblk_t block; 1537 ext4_fsblk_t sb_block = get_sb_block(&data); 1538 ext4_fsblk_t logical_sb_block; 1539 unsigned long offset = 0; 1540 unsigned int journal_inum = 0; 1541 unsigned long journal_devnum = 0; 1542 unsigned long def_mount_opts; 1543 struct inode *root; 1544 int blocksize; 1545 int hblock; 1546 int db_count; 1547 int i; 1548 int needs_recovery; 1549 __le32 features; 1550 __u64 blocks_count; 1551 int err; 1552 1553 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 1554 if (!sbi) 1555 return -ENOMEM; 1556 sb->s_fs_info = sbi; 1557 sbi->s_mount_opt = 0; 1558 sbi->s_resuid = EXT4_DEF_RESUID; 1559 sbi->s_resgid = EXT4_DEF_RESGID; 1560 sbi->s_sb_block = sb_block; 1561 1562 unlock_kernel(); 1563 1564 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); 1565 if (!blocksize) { 1566 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n"); 1567 goto out_fail; 1568 } 1569 1570 /* 1571 * The ext4 superblock will not be buffer aligned for other than 1kB 1572 * block sizes. We need to calculate the offset from buffer start. 1573 */ 1574 if (blocksize != EXT4_MIN_BLOCK_SIZE) { 1575 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 1576 offset = do_div(logical_sb_block, blocksize); 1577 } else { 1578 logical_sb_block = sb_block; 1579 } 1580 1581 if (!(bh = sb_bread(sb, logical_sb_block))) { 1582 printk (KERN_ERR "EXT4-fs: unable to read superblock\n"); 1583 goto out_fail; 1584 } 1585 /* 1586 * Note: s_es must be initialized as soon as possible because 1587 * some ext4 macro-instructions depend on its value 1588 */ 1589 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 1590 sbi->s_es = es; 1591 sb->s_magic = le16_to_cpu(es->s_magic); 1592 if (sb->s_magic != EXT4_SUPER_MAGIC) 1593 goto cantfind_ext4; 1594 1595 /* Set defaults before we parse the mount options */ 1596 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 1597 if (def_mount_opts & EXT4_DEFM_DEBUG) 1598 set_opt(sbi->s_mount_opt, DEBUG); 1599 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) 1600 set_opt(sbi->s_mount_opt, GRPID); 1601 if (def_mount_opts & EXT4_DEFM_UID16) 1602 set_opt(sbi->s_mount_opt, NO_UID32); 1603 #ifdef CONFIG_EXT4DEV_FS_XATTR 1604 if (def_mount_opts & EXT4_DEFM_XATTR_USER) 1605 set_opt(sbi->s_mount_opt, XATTR_USER); 1606 #endif 1607 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 1608 if (def_mount_opts & EXT4_DEFM_ACL) 1609 set_opt(sbi->s_mount_opt, POSIX_ACL); 1610 #endif 1611 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) 1612 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA; 1613 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) 1614 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA; 1615 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) 1616 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA; 1617 1618 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) 1619 set_opt(sbi->s_mount_opt, ERRORS_PANIC); 1620 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_RO) 1621 set_opt(sbi->s_mount_opt, ERRORS_RO); 1622 else 1623 set_opt(sbi->s_mount_opt, ERRORS_CONT); 1624 1625 sbi->s_resuid = le16_to_cpu(es->s_def_resuid); 1626 sbi->s_resgid = le16_to_cpu(es->s_def_resgid); 1627 1628 set_opt(sbi->s_mount_opt, RESERVATION); 1629 1630 /* 1631 * turn on extents feature by default in ext4 filesystem 1632 * User -o noextents to turn it off 1633 */ 1634 set_opt(sbi->s_mount_opt, EXTENTS); 1635 1636 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum, 1637 NULL, 0)) 1638 goto failed_mount; 1639 1640 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 1641 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 1642 1643 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && 1644 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || 1645 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 1646 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) 1647 printk(KERN_WARNING 1648 "EXT4-fs warning: feature flags set on rev 0 fs, " 1649 "running e2fsck is recommended\n"); 1650 /* 1651 * Check feature flags regardless of the revision level, since we 1652 * previously didn't change the revision level when setting the flags, 1653 * so there is a chance incompat flags are set on a rev 0 filesystem. 1654 */ 1655 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP); 1656 if (features) { 1657 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of " 1658 "unsupported optional features (%x).\n", 1659 sb->s_id, le32_to_cpu(features)); 1660 goto failed_mount; 1661 } 1662 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP); 1663 if (!(sb->s_flags & MS_RDONLY) && features) { 1664 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of " 1665 "unsupported optional features (%x).\n", 1666 sb->s_id, le32_to_cpu(features)); 1667 goto failed_mount; 1668 } 1669 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); 1670 1671 if (blocksize < EXT4_MIN_BLOCK_SIZE || 1672 blocksize > EXT4_MAX_BLOCK_SIZE) { 1673 printk(KERN_ERR 1674 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n", 1675 blocksize, sb->s_id); 1676 goto failed_mount; 1677 } 1678 1679 hblock = bdev_hardsect_size(sb->s_bdev); 1680 if (sb->s_blocksize != blocksize) { 1681 /* 1682 * Make sure the blocksize for the filesystem is larger 1683 * than the hardware sectorsize for the machine. 1684 */ 1685 if (blocksize < hblock) { 1686 printk(KERN_ERR "EXT4-fs: blocksize %d too small for " 1687 "device blocksize %d.\n", blocksize, hblock); 1688 goto failed_mount; 1689 } 1690 1691 brelse (bh); 1692 sb_set_blocksize(sb, blocksize); 1693 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 1694 offset = do_div(logical_sb_block, blocksize); 1695 bh = sb_bread(sb, logical_sb_block); 1696 if (!bh) { 1697 printk(KERN_ERR 1698 "EXT4-fs: Can't read superblock on 2nd try.\n"); 1699 goto failed_mount; 1700 } 1701 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); 1702 sbi->s_es = es; 1703 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { 1704 printk (KERN_ERR 1705 "EXT4-fs: Magic mismatch, very weird !\n"); 1706 goto failed_mount; 1707 } 1708 } 1709 1710 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits); 1711 1712 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { 1713 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; 1714 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; 1715 } else { 1716 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 1717 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 1718 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || 1719 (!is_power_of_2(sbi->s_inode_size)) || 1720 (sbi->s_inode_size > blocksize)) { 1721 printk (KERN_ERR 1722 "EXT4-fs: unsupported inode size: %d\n", 1723 sbi->s_inode_size); 1724 goto failed_mount; 1725 } 1726 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) 1727 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); 1728 } 1729 sbi->s_frag_size = EXT4_MIN_FRAG_SIZE << 1730 le32_to_cpu(es->s_log_frag_size); 1731 if (blocksize != sbi->s_frag_size) { 1732 printk(KERN_ERR 1733 "EXT4-fs: fragsize %lu != blocksize %u (unsupported)\n", 1734 sbi->s_frag_size, blocksize); 1735 goto failed_mount; 1736 } 1737 sbi->s_desc_size = le16_to_cpu(es->s_desc_size); 1738 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { 1739 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || 1740 sbi->s_desc_size > EXT4_MAX_DESC_SIZE || 1741 !is_power_of_2(sbi->s_desc_size)) { 1742 printk(KERN_ERR 1743 "EXT4-fs: unsupported descriptor size %lu\n", 1744 sbi->s_desc_size); 1745 goto failed_mount; 1746 } 1747 } else 1748 sbi->s_desc_size = EXT4_MIN_DESC_SIZE; 1749 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 1750 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); 1751 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 1752 if (EXT4_INODE_SIZE(sb) == 0) 1753 goto cantfind_ext4; 1754 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); 1755 if (sbi->s_inodes_per_block == 0) 1756 goto cantfind_ext4; 1757 sbi->s_itb_per_group = sbi->s_inodes_per_group / 1758 sbi->s_inodes_per_block; 1759 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); 1760 sbi->s_sbh = bh; 1761 sbi->s_mount_state = le16_to_cpu(es->s_state); 1762 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); 1763 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); 1764 for (i=0; i < 4; i++) 1765 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); 1766 sbi->s_def_hash_version = es->s_def_hash_version; 1767 1768 if (sbi->s_blocks_per_group > blocksize * 8) { 1769 printk (KERN_ERR 1770 "EXT4-fs: #blocks per group too big: %lu\n", 1771 sbi->s_blocks_per_group); 1772 goto failed_mount; 1773 } 1774 if (sbi->s_frags_per_group > blocksize * 8) { 1775 printk (KERN_ERR 1776 "EXT4-fs: #fragments per group too big: %lu\n", 1777 sbi->s_frags_per_group); 1778 goto failed_mount; 1779 } 1780 if (sbi->s_inodes_per_group > blocksize * 8) { 1781 printk (KERN_ERR 1782 "EXT4-fs: #inodes per group too big: %lu\n", 1783 sbi->s_inodes_per_group); 1784 goto failed_mount; 1785 } 1786 1787 if (ext4_blocks_count(es) > 1788 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { 1789 printk(KERN_ERR "EXT4-fs: filesystem on %s:" 1790 " too large to mount safely\n", sb->s_id); 1791 if (sizeof(sector_t) < 8) 1792 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not " 1793 "enabled\n"); 1794 goto failed_mount; 1795 } 1796 1797 if (EXT4_BLOCKS_PER_GROUP(sb) == 0) 1798 goto cantfind_ext4; 1799 blocks_count = (ext4_blocks_count(es) - 1800 le32_to_cpu(es->s_first_data_block) + 1801 EXT4_BLOCKS_PER_GROUP(sb) - 1); 1802 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); 1803 sbi->s_groups_count = blocks_count; 1804 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / 1805 EXT4_DESC_PER_BLOCK(sb); 1806 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *), 1807 GFP_KERNEL); 1808 if (sbi->s_group_desc == NULL) { 1809 printk (KERN_ERR "EXT4-fs: not enough memory\n"); 1810 goto failed_mount; 1811 } 1812 1813 bgl_lock_init(&sbi->s_blockgroup_lock); 1814 1815 for (i = 0; i < db_count; i++) { 1816 block = descriptor_loc(sb, logical_sb_block, i); 1817 sbi->s_group_desc[i] = sb_bread(sb, block); 1818 if (!sbi->s_group_desc[i]) { 1819 printk (KERN_ERR "EXT4-fs: " 1820 "can't read group descriptor %d\n", i); 1821 db_count = i; 1822 goto failed_mount2; 1823 } 1824 } 1825 if (!ext4_check_descriptors (sb)) { 1826 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n"); 1827 goto failed_mount2; 1828 } 1829 sbi->s_gdb_count = db_count; 1830 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 1831 spin_lock_init(&sbi->s_next_gen_lock); 1832 1833 err = percpu_counter_init(&sbi->s_freeblocks_counter, 1834 ext4_count_free_blocks(sb)); 1835 if (!err) { 1836 err = percpu_counter_init(&sbi->s_freeinodes_counter, 1837 ext4_count_free_inodes(sb)); 1838 } 1839 if (!err) { 1840 err = percpu_counter_init(&sbi->s_dirs_counter, 1841 ext4_count_dirs(sb)); 1842 } 1843 if (err) { 1844 printk(KERN_ERR "EXT4-fs: insufficient memory\n"); 1845 goto failed_mount3; 1846 } 1847 1848 /* per fileystem reservation list head & lock */ 1849 spin_lock_init(&sbi->s_rsv_window_lock); 1850 sbi->s_rsv_window_root = RB_ROOT; 1851 /* Add a single, static dummy reservation to the start of the 1852 * reservation window list --- it gives us a placeholder for 1853 * append-at-start-of-list which makes the allocation logic 1854 * _much_ simpler. */ 1855 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; 1856 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; 1857 sbi->s_rsv_window_head.rsv_alloc_hit = 0; 1858 sbi->s_rsv_window_head.rsv_goal_size = 0; 1859 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head); 1860 1861 /* 1862 * set up enough so that it can read an inode 1863 */ 1864 sb->s_op = &ext4_sops; 1865 sb->s_export_op = &ext4_export_ops; 1866 sb->s_xattr = ext4_xattr_handlers; 1867 #ifdef CONFIG_QUOTA 1868 sb->s_qcop = &ext4_qctl_operations; 1869 sb->dq_op = &ext4_quota_operations; 1870 #endif 1871 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ 1872 1873 sb->s_root = NULL; 1874 1875 needs_recovery = (es->s_last_orphan != 0 || 1876 EXT4_HAS_INCOMPAT_FEATURE(sb, 1877 EXT4_FEATURE_INCOMPAT_RECOVER)); 1878 1879 /* 1880 * The first inode we look at is the journal inode. Don't try 1881 * root first: it may be modified in the journal! 1882 */ 1883 if (!test_opt(sb, NOLOAD) && 1884 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 1885 if (ext4_load_journal(sb, es, journal_devnum)) 1886 goto failed_mount3; 1887 } else if (journal_inum) { 1888 if (ext4_create_journal(sb, es, journal_inum)) 1889 goto failed_mount3; 1890 } else { 1891 if (!silent) 1892 printk (KERN_ERR 1893 "ext4: No journal on filesystem on %s\n", 1894 sb->s_id); 1895 goto failed_mount3; 1896 } 1897 1898 if (ext4_blocks_count(es) > 0xffffffffULL && 1899 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, 1900 JBD2_FEATURE_INCOMPAT_64BIT)) { 1901 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n"); 1902 goto failed_mount4; 1903 } 1904 1905 /* We have now updated the journal if required, so we can 1906 * validate the data journaling mode. */ 1907 switch (test_opt(sb, DATA_FLAGS)) { 1908 case 0: 1909 /* No mode set, assume a default based on the journal 1910 * capabilities: ORDERED_DATA if the journal can 1911 * cope, else JOURNAL_DATA 1912 */ 1913 if (jbd2_journal_check_available_features 1914 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) 1915 set_opt(sbi->s_mount_opt, ORDERED_DATA); 1916 else 1917 set_opt(sbi->s_mount_opt, JOURNAL_DATA); 1918 break; 1919 1920 case EXT4_MOUNT_ORDERED_DATA: 1921 case EXT4_MOUNT_WRITEBACK_DATA: 1922 if (!jbd2_journal_check_available_features 1923 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { 1924 printk(KERN_ERR "EXT4-fs: Journal does not support " 1925 "requested data journaling mode\n"); 1926 goto failed_mount4; 1927 } 1928 default: 1929 break; 1930 } 1931 1932 if (test_opt(sb, NOBH)) { 1933 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) { 1934 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - " 1935 "its supported only with writeback mode\n"); 1936 clear_opt(sbi->s_mount_opt, NOBH); 1937 } 1938 } 1939 /* 1940 * The jbd2_journal_load will have done any necessary log recovery, 1941 * so we can safely mount the rest of the filesystem now. 1942 */ 1943 1944 root = iget(sb, EXT4_ROOT_INO); 1945 sb->s_root = d_alloc_root(root); 1946 if (!sb->s_root) { 1947 printk(KERN_ERR "EXT4-fs: get root inode failed\n"); 1948 iput(root); 1949 goto failed_mount4; 1950 } 1951 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 1952 dput(sb->s_root); 1953 sb->s_root = NULL; 1954 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n"); 1955 goto failed_mount4; 1956 } 1957 1958 ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY); 1959 1960 /* determine the minimum size of new large inodes, if present */ 1961 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { 1962 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 1963 EXT4_GOOD_OLD_INODE_SIZE; 1964 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 1965 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { 1966 if (sbi->s_want_extra_isize < 1967 le16_to_cpu(es->s_want_extra_isize)) 1968 sbi->s_want_extra_isize = 1969 le16_to_cpu(es->s_want_extra_isize); 1970 if (sbi->s_want_extra_isize < 1971 le16_to_cpu(es->s_min_extra_isize)) 1972 sbi->s_want_extra_isize = 1973 le16_to_cpu(es->s_min_extra_isize); 1974 } 1975 } 1976 /* Check if enough inode space is available */ 1977 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > 1978 sbi->s_inode_size) { 1979 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 1980 EXT4_GOOD_OLD_INODE_SIZE; 1981 printk(KERN_INFO "EXT4-fs: required extra inode space not" 1982 "available.\n"); 1983 } 1984 1985 /* 1986 * akpm: core read_super() calls in here with the superblock locked. 1987 * That deadlocks, because orphan cleanup needs to lock the superblock 1988 * in numerous places. Here we just pop the lock - it's relatively 1989 * harmless, because we are now ready to accept write_super() requests, 1990 * and aviro says that's the only reason for hanging onto the 1991 * superblock lock. 1992 */ 1993 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; 1994 ext4_orphan_cleanup(sb, es); 1995 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; 1996 if (needs_recovery) 1997 printk (KERN_INFO "EXT4-fs: recovery complete.\n"); 1998 ext4_mark_recovery_complete(sb, es); 1999 printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n", 2000 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal": 2001 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered": 2002 "writeback"); 2003 2004 ext4_ext_init(sb); 2005 2006 lock_kernel(); 2007 return 0; 2008 2009 cantfind_ext4: 2010 if (!silent) 2011 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n", 2012 sb->s_id); 2013 goto failed_mount; 2014 2015 failed_mount4: 2016 jbd2_journal_destroy(sbi->s_journal); 2017 failed_mount3: 2018 percpu_counter_destroy(&sbi->s_freeblocks_counter); 2019 percpu_counter_destroy(&sbi->s_freeinodes_counter); 2020 percpu_counter_destroy(&sbi->s_dirs_counter); 2021 failed_mount2: 2022 for (i = 0; i < db_count; i++) 2023 brelse(sbi->s_group_desc[i]); 2024 kfree(sbi->s_group_desc); 2025 failed_mount: 2026 #ifdef CONFIG_QUOTA 2027 for (i = 0; i < MAXQUOTAS; i++) 2028 kfree(sbi->s_qf_names[i]); 2029 #endif 2030 ext4_blkdev_remove(sbi); 2031 brelse(bh); 2032 out_fail: 2033 sb->s_fs_info = NULL; 2034 kfree(sbi); 2035 lock_kernel(); 2036 return -EINVAL; 2037 } 2038 2039 /* 2040 * Setup any per-fs journal parameters now. We'll do this both on 2041 * initial mount, once the journal has been initialised but before we've 2042 * done any recovery; and again on any subsequent remount. 2043 */ 2044 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) 2045 { 2046 struct ext4_sb_info *sbi = EXT4_SB(sb); 2047 2048 if (sbi->s_commit_interval) 2049 journal->j_commit_interval = sbi->s_commit_interval; 2050 /* We could also set up an ext4-specific default for the commit 2051 * interval here, but for now we'll just fall back to the jbd 2052 * default. */ 2053 2054 spin_lock(&journal->j_state_lock); 2055 if (test_opt(sb, BARRIER)) 2056 journal->j_flags |= JBD2_BARRIER; 2057 else 2058 journal->j_flags &= ~JBD2_BARRIER; 2059 spin_unlock(&journal->j_state_lock); 2060 } 2061 2062 static journal_t *ext4_get_journal(struct super_block *sb, 2063 unsigned int journal_inum) 2064 { 2065 struct inode *journal_inode; 2066 journal_t *journal; 2067 2068 /* First, test for the existence of a valid inode on disk. Bad 2069 * things happen if we iget() an unused inode, as the subsequent 2070 * iput() will try to delete it. */ 2071 2072 journal_inode = iget(sb, journal_inum); 2073 if (!journal_inode) { 2074 printk(KERN_ERR "EXT4-fs: no journal found.\n"); 2075 return NULL; 2076 } 2077 if (!journal_inode->i_nlink) { 2078 make_bad_inode(journal_inode); 2079 iput(journal_inode); 2080 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n"); 2081 return NULL; 2082 } 2083 2084 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n", 2085 journal_inode, journal_inode->i_size); 2086 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) { 2087 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n"); 2088 iput(journal_inode); 2089 return NULL; 2090 } 2091 2092 journal = jbd2_journal_init_inode(journal_inode); 2093 if (!journal) { 2094 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n"); 2095 iput(journal_inode); 2096 return NULL; 2097 } 2098 journal->j_private = sb; 2099 ext4_init_journal_params(sb, journal); 2100 return journal; 2101 } 2102 2103 static journal_t *ext4_get_dev_journal(struct super_block *sb, 2104 dev_t j_dev) 2105 { 2106 struct buffer_head * bh; 2107 journal_t *journal; 2108 ext4_fsblk_t start; 2109 ext4_fsblk_t len; 2110 int hblock, blocksize; 2111 ext4_fsblk_t sb_block; 2112 unsigned long offset; 2113 struct ext4_super_block * es; 2114 struct block_device *bdev; 2115 2116 bdev = ext4_blkdev_get(j_dev); 2117 if (bdev == NULL) 2118 return NULL; 2119 2120 if (bd_claim(bdev, sb)) { 2121 printk(KERN_ERR 2122 "EXT4: failed to claim external journal device.\n"); 2123 blkdev_put(bdev); 2124 return NULL; 2125 } 2126 2127 blocksize = sb->s_blocksize; 2128 hblock = bdev_hardsect_size(bdev); 2129 if (blocksize < hblock) { 2130 printk(KERN_ERR 2131 "EXT4-fs: blocksize too small for journal device.\n"); 2132 goto out_bdev; 2133 } 2134 2135 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; 2136 offset = EXT4_MIN_BLOCK_SIZE % blocksize; 2137 set_blocksize(bdev, blocksize); 2138 if (!(bh = __bread(bdev, sb_block, blocksize))) { 2139 printk(KERN_ERR "EXT4-fs: couldn't read superblock of " 2140 "external journal\n"); 2141 goto out_bdev; 2142 } 2143 2144 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 2145 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || 2146 !(le32_to_cpu(es->s_feature_incompat) & 2147 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { 2148 printk(KERN_ERR "EXT4-fs: external journal has " 2149 "bad superblock\n"); 2150 brelse(bh); 2151 goto out_bdev; 2152 } 2153 2154 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { 2155 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n"); 2156 brelse(bh); 2157 goto out_bdev; 2158 } 2159 2160 len = ext4_blocks_count(es); 2161 start = sb_block + 1; 2162 brelse(bh); /* we're done with the superblock */ 2163 2164 journal = jbd2_journal_init_dev(bdev, sb->s_bdev, 2165 start, len, blocksize); 2166 if (!journal) { 2167 printk(KERN_ERR "EXT4-fs: failed to create device journal\n"); 2168 goto out_bdev; 2169 } 2170 journal->j_private = sb; 2171 ll_rw_block(READ, 1, &journal->j_sb_buffer); 2172 wait_on_buffer(journal->j_sb_buffer); 2173 if (!buffer_uptodate(journal->j_sb_buffer)) { 2174 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n"); 2175 goto out_journal; 2176 } 2177 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { 2178 printk(KERN_ERR "EXT4-fs: External journal has more than one " 2179 "user (unsupported) - %d\n", 2180 be32_to_cpu(journal->j_superblock->s_nr_users)); 2181 goto out_journal; 2182 } 2183 EXT4_SB(sb)->journal_bdev = bdev; 2184 ext4_init_journal_params(sb, journal); 2185 return journal; 2186 out_journal: 2187 jbd2_journal_destroy(journal); 2188 out_bdev: 2189 ext4_blkdev_put(bdev); 2190 return NULL; 2191 } 2192 2193 static int ext4_load_journal(struct super_block *sb, 2194 struct ext4_super_block *es, 2195 unsigned long journal_devnum) 2196 { 2197 journal_t *journal; 2198 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); 2199 dev_t journal_dev; 2200 int err = 0; 2201 int really_read_only; 2202 2203 if (journal_devnum && 2204 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 2205 printk(KERN_INFO "EXT4-fs: external journal device major/minor " 2206 "numbers have changed\n"); 2207 journal_dev = new_decode_dev(journal_devnum); 2208 } else 2209 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); 2210 2211 really_read_only = bdev_read_only(sb->s_bdev); 2212 2213 /* 2214 * Are we loading a blank journal or performing recovery after a 2215 * crash? For recovery, we need to check in advance whether we 2216 * can get read-write access to the device. 2217 */ 2218 2219 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 2220 if (sb->s_flags & MS_RDONLY) { 2221 printk(KERN_INFO "EXT4-fs: INFO: recovery " 2222 "required on readonly filesystem.\n"); 2223 if (really_read_only) { 2224 printk(KERN_ERR "EXT4-fs: write access " 2225 "unavailable, cannot proceed.\n"); 2226 return -EROFS; 2227 } 2228 printk (KERN_INFO "EXT4-fs: write access will " 2229 "be enabled during recovery.\n"); 2230 } 2231 } 2232 2233 if (journal_inum && journal_dev) { 2234 printk(KERN_ERR "EXT4-fs: filesystem has both journal " 2235 "and inode journals!\n"); 2236 return -EINVAL; 2237 } 2238 2239 if (journal_inum) { 2240 if (!(journal = ext4_get_journal(sb, journal_inum))) 2241 return -EINVAL; 2242 } else { 2243 if (!(journal = ext4_get_dev_journal(sb, journal_dev))) 2244 return -EINVAL; 2245 } 2246 2247 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { 2248 err = jbd2_journal_update_format(journal); 2249 if (err) { 2250 printk(KERN_ERR "EXT4-fs: error updating journal.\n"); 2251 jbd2_journal_destroy(journal); 2252 return err; 2253 } 2254 } 2255 2256 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) 2257 err = jbd2_journal_wipe(journal, !really_read_only); 2258 if (!err) 2259 err = jbd2_journal_load(journal); 2260 2261 if (err) { 2262 printk(KERN_ERR "EXT4-fs: error loading journal.\n"); 2263 jbd2_journal_destroy(journal); 2264 return err; 2265 } 2266 2267 EXT4_SB(sb)->s_journal = journal; 2268 ext4_clear_journal_err(sb, es); 2269 2270 if (journal_devnum && 2271 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 2272 es->s_journal_dev = cpu_to_le32(journal_devnum); 2273 sb->s_dirt = 1; 2274 2275 /* Make sure we flush the recovery flag to disk. */ 2276 ext4_commit_super(sb, es, 1); 2277 } 2278 2279 return 0; 2280 } 2281 2282 static int ext4_create_journal(struct super_block * sb, 2283 struct ext4_super_block * es, 2284 unsigned int journal_inum) 2285 { 2286 journal_t *journal; 2287 int err; 2288 2289 if (sb->s_flags & MS_RDONLY) { 2290 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to " 2291 "create journal.\n"); 2292 return -EROFS; 2293 } 2294 2295 journal = ext4_get_journal(sb, journal_inum); 2296 if (!journal) 2297 return -EINVAL; 2298 2299 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n", 2300 journal_inum); 2301 2302 err = jbd2_journal_create(journal); 2303 if (err) { 2304 printk(KERN_ERR "EXT4-fs: error creating journal.\n"); 2305 jbd2_journal_destroy(journal); 2306 return -EIO; 2307 } 2308 2309 EXT4_SB(sb)->s_journal = journal; 2310 2311 ext4_update_dynamic_rev(sb); 2312 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2313 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL); 2314 2315 es->s_journal_inum = cpu_to_le32(journal_inum); 2316 sb->s_dirt = 1; 2317 2318 /* Make sure we flush the recovery flag to disk. */ 2319 ext4_commit_super(sb, es, 1); 2320 2321 return 0; 2322 } 2323 2324 static void ext4_commit_super (struct super_block * sb, 2325 struct ext4_super_block * es, 2326 int sync) 2327 { 2328 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; 2329 2330 if (!sbh) 2331 return; 2332 es->s_wtime = cpu_to_le32(get_seconds()); 2333 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb)); 2334 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb)); 2335 BUFFER_TRACE(sbh, "marking dirty"); 2336 mark_buffer_dirty(sbh); 2337 if (sync) 2338 sync_dirty_buffer(sbh); 2339 } 2340 2341 2342 /* 2343 * Have we just finished recovery? If so, and if we are mounting (or 2344 * remounting) the filesystem readonly, then we will end up with a 2345 * consistent fs on disk. Record that fact. 2346 */ 2347 static void ext4_mark_recovery_complete(struct super_block * sb, 2348 struct ext4_super_block * es) 2349 { 2350 journal_t *journal = EXT4_SB(sb)->s_journal; 2351 2352 jbd2_journal_lock_updates(journal); 2353 jbd2_journal_flush(journal); 2354 lock_super(sb); 2355 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && 2356 sb->s_flags & MS_RDONLY) { 2357 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2358 sb->s_dirt = 0; 2359 ext4_commit_super(sb, es, 1); 2360 } 2361 unlock_super(sb); 2362 jbd2_journal_unlock_updates(journal); 2363 } 2364 2365 /* 2366 * If we are mounting (or read-write remounting) a filesystem whose journal 2367 * has recorded an error from a previous lifetime, move that error to the 2368 * main filesystem now. 2369 */ 2370 static void ext4_clear_journal_err(struct super_block * sb, 2371 struct ext4_super_block * es) 2372 { 2373 journal_t *journal; 2374 int j_errno; 2375 const char *errstr; 2376 2377 journal = EXT4_SB(sb)->s_journal; 2378 2379 /* 2380 * Now check for any error status which may have been recorded in the 2381 * journal by a prior ext4_error() or ext4_abort() 2382 */ 2383 2384 j_errno = jbd2_journal_errno(journal); 2385 if (j_errno) { 2386 char nbuf[16]; 2387 2388 errstr = ext4_decode_error(sb, j_errno, nbuf); 2389 ext4_warning(sb, __FUNCTION__, "Filesystem error recorded " 2390 "from previous mount: %s", errstr); 2391 ext4_warning(sb, __FUNCTION__, "Marking fs in need of " 2392 "filesystem check."); 2393 2394 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 2395 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 2396 ext4_commit_super (sb, es, 1); 2397 2398 jbd2_journal_clear_err(journal); 2399 } 2400 } 2401 2402 /* 2403 * Force the running and committing transactions to commit, 2404 * and wait on the commit. 2405 */ 2406 int ext4_force_commit(struct super_block *sb) 2407 { 2408 journal_t *journal; 2409 int ret; 2410 2411 if (sb->s_flags & MS_RDONLY) 2412 return 0; 2413 2414 journal = EXT4_SB(sb)->s_journal; 2415 sb->s_dirt = 0; 2416 ret = ext4_journal_force_commit(journal); 2417 return ret; 2418 } 2419 2420 /* 2421 * Ext4 always journals updates to the superblock itself, so we don't 2422 * have to propagate any other updates to the superblock on disk at this 2423 * point. Just start an async writeback to get the buffers on their way 2424 * to the disk. 2425 * 2426 * This implicitly triggers the writebehind on sync(). 2427 */ 2428 2429 static void ext4_write_super (struct super_block * sb) 2430 { 2431 if (mutex_trylock(&sb->s_lock) != 0) 2432 BUG(); 2433 sb->s_dirt = 0; 2434 } 2435 2436 static int ext4_sync_fs(struct super_block *sb, int wait) 2437 { 2438 tid_t target; 2439 2440 sb->s_dirt = 0; 2441 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) { 2442 if (wait) 2443 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target); 2444 } 2445 return 0; 2446 } 2447 2448 /* 2449 * LVM calls this function before a (read-only) snapshot is created. This 2450 * gives us a chance to flush the journal completely and mark the fs clean. 2451 */ 2452 static void ext4_write_super_lockfs(struct super_block *sb) 2453 { 2454 sb->s_dirt = 0; 2455 2456 if (!(sb->s_flags & MS_RDONLY)) { 2457 journal_t *journal = EXT4_SB(sb)->s_journal; 2458 2459 /* Now we set up the journal barrier. */ 2460 jbd2_journal_lock_updates(journal); 2461 jbd2_journal_flush(journal); 2462 2463 /* Journal blocked and flushed, clear needs_recovery flag. */ 2464 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2465 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); 2466 } 2467 } 2468 2469 /* 2470 * Called by LVM after the snapshot is done. We need to reset the RECOVER 2471 * flag here, even though the filesystem is not technically dirty yet. 2472 */ 2473 static void ext4_unlockfs(struct super_block *sb) 2474 { 2475 if (!(sb->s_flags & MS_RDONLY)) { 2476 lock_super(sb); 2477 /* Reser the needs_recovery flag before the fs is unlocked. */ 2478 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2479 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); 2480 unlock_super(sb); 2481 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 2482 } 2483 } 2484 2485 static int ext4_remount (struct super_block * sb, int * flags, char * data) 2486 { 2487 struct ext4_super_block * es; 2488 struct ext4_sb_info *sbi = EXT4_SB(sb); 2489 ext4_fsblk_t n_blocks_count = 0; 2490 unsigned long old_sb_flags; 2491 struct ext4_mount_options old_opts; 2492 int err; 2493 #ifdef CONFIG_QUOTA 2494 int i; 2495 #endif 2496 2497 /* Store the original options */ 2498 old_sb_flags = sb->s_flags; 2499 old_opts.s_mount_opt = sbi->s_mount_opt; 2500 old_opts.s_resuid = sbi->s_resuid; 2501 old_opts.s_resgid = sbi->s_resgid; 2502 old_opts.s_commit_interval = sbi->s_commit_interval; 2503 #ifdef CONFIG_QUOTA 2504 old_opts.s_jquota_fmt = sbi->s_jquota_fmt; 2505 for (i = 0; i < MAXQUOTAS; i++) 2506 old_opts.s_qf_names[i] = sbi->s_qf_names[i]; 2507 #endif 2508 2509 /* 2510 * Allow the "check" option to be passed as a remount option. 2511 */ 2512 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) { 2513 err = -EINVAL; 2514 goto restore_opts; 2515 } 2516 2517 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) 2518 ext4_abort(sb, __FUNCTION__, "Abort forced by user"); 2519 2520 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 2521 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 2522 2523 es = sbi->s_es; 2524 2525 ext4_init_journal_params(sb, sbi->s_journal); 2526 2527 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || 2528 n_blocks_count > ext4_blocks_count(es)) { 2529 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) { 2530 err = -EROFS; 2531 goto restore_opts; 2532 } 2533 2534 if (*flags & MS_RDONLY) { 2535 /* 2536 * First of all, the unconditional stuff we have to do 2537 * to disable replay of the journal when we next remount 2538 */ 2539 sb->s_flags |= MS_RDONLY; 2540 2541 /* 2542 * OK, test if we are remounting a valid rw partition 2543 * readonly, and if so set the rdonly flag and then 2544 * mark the partition as valid again. 2545 */ 2546 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && 2547 (sbi->s_mount_state & EXT4_VALID_FS)) 2548 es->s_state = cpu_to_le16(sbi->s_mount_state); 2549 2550 /* 2551 * We have to unlock super so that we can wait for 2552 * transactions. 2553 */ 2554 unlock_super(sb); 2555 ext4_mark_recovery_complete(sb, es); 2556 lock_super(sb); 2557 } else { 2558 __le32 ret; 2559 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb, 2560 ~EXT4_FEATURE_RO_COMPAT_SUPP))) { 2561 printk(KERN_WARNING "EXT4-fs: %s: couldn't " 2562 "remount RDWR because of unsupported " 2563 "optional features (%x).\n", 2564 sb->s_id, le32_to_cpu(ret)); 2565 err = -EROFS; 2566 goto restore_opts; 2567 } 2568 2569 /* 2570 * If we have an unprocessed orphan list hanging 2571 * around from a previously readonly bdev mount, 2572 * require a full umount/remount for now. 2573 */ 2574 if (es->s_last_orphan) { 2575 printk(KERN_WARNING "EXT4-fs: %s: couldn't " 2576 "remount RDWR because of unprocessed " 2577 "orphan inode list. Please " 2578 "umount/remount instead.\n", 2579 sb->s_id); 2580 err = -EINVAL; 2581 goto restore_opts; 2582 } 2583 2584 /* 2585 * Mounting a RDONLY partition read-write, so reread 2586 * and store the current valid flag. (It may have 2587 * been changed by e2fsck since we originally mounted 2588 * the partition.) 2589 */ 2590 ext4_clear_journal_err(sb, es); 2591 sbi->s_mount_state = le16_to_cpu(es->s_state); 2592 if ((err = ext4_group_extend(sb, es, n_blocks_count))) 2593 goto restore_opts; 2594 if (!ext4_setup_super (sb, es, 0)) 2595 sb->s_flags &= ~MS_RDONLY; 2596 } 2597 } 2598 #ifdef CONFIG_QUOTA 2599 /* Release old quota file names */ 2600 for (i = 0; i < MAXQUOTAS; i++) 2601 if (old_opts.s_qf_names[i] && 2602 old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 2603 kfree(old_opts.s_qf_names[i]); 2604 #endif 2605 return 0; 2606 restore_opts: 2607 sb->s_flags = old_sb_flags; 2608 sbi->s_mount_opt = old_opts.s_mount_opt; 2609 sbi->s_resuid = old_opts.s_resuid; 2610 sbi->s_resgid = old_opts.s_resgid; 2611 sbi->s_commit_interval = old_opts.s_commit_interval; 2612 #ifdef CONFIG_QUOTA 2613 sbi->s_jquota_fmt = old_opts.s_jquota_fmt; 2614 for (i = 0; i < MAXQUOTAS; i++) { 2615 if (sbi->s_qf_names[i] && 2616 old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 2617 kfree(sbi->s_qf_names[i]); 2618 sbi->s_qf_names[i] = old_opts.s_qf_names[i]; 2619 } 2620 #endif 2621 return err; 2622 } 2623 2624 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf) 2625 { 2626 struct super_block *sb = dentry->d_sb; 2627 struct ext4_sb_info *sbi = EXT4_SB(sb); 2628 struct ext4_super_block *es = sbi->s_es; 2629 u64 fsid; 2630 2631 if (test_opt(sb, MINIX_DF)) { 2632 sbi->s_overhead_last = 0; 2633 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { 2634 unsigned long ngroups = sbi->s_groups_count, i; 2635 ext4_fsblk_t overhead = 0; 2636 smp_rmb(); 2637 2638 /* 2639 * Compute the overhead (FS structures). This is constant 2640 * for a given filesystem unless the number of block groups 2641 * changes so we cache the previous value until it does. 2642 */ 2643 2644 /* 2645 * All of the blocks before first_data_block are 2646 * overhead 2647 */ 2648 overhead = le32_to_cpu(es->s_first_data_block); 2649 2650 /* 2651 * Add the overhead attributed to the superblock and 2652 * block group descriptors. If the sparse superblocks 2653 * feature is turned on, then not all groups have this. 2654 */ 2655 for (i = 0; i < ngroups; i++) { 2656 overhead += ext4_bg_has_super(sb, i) + 2657 ext4_bg_num_gdb(sb, i); 2658 cond_resched(); 2659 } 2660 2661 /* 2662 * Every block group has an inode bitmap, a block 2663 * bitmap, and an inode table. 2664 */ 2665 overhead += ngroups * (2 + sbi->s_itb_per_group); 2666 sbi->s_overhead_last = overhead; 2667 smp_wmb(); 2668 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); 2669 } 2670 2671 buf->f_type = EXT4_SUPER_MAGIC; 2672 buf->f_bsize = sb->s_blocksize; 2673 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last; 2674 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter); 2675 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); 2676 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); 2677 if (buf->f_bfree < ext4_r_blocks_count(es)) 2678 buf->f_bavail = 0; 2679 buf->f_files = le32_to_cpu(es->s_inodes_count); 2680 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); 2681 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); 2682 buf->f_namelen = EXT4_NAME_LEN; 2683 fsid = le64_to_cpup((void *)es->s_uuid) ^ 2684 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 2685 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 2686 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 2687 return 0; 2688 } 2689 2690 /* Helper function for writing quotas on sync - we need to start transaction before quota file 2691 * is locked for write. Otherwise the are possible deadlocks: 2692 * Process 1 Process 2 2693 * ext4_create() quota_sync() 2694 * jbd2_journal_start() write_dquot() 2695 * DQUOT_INIT() down(dqio_mutex) 2696 * down(dqio_mutex) jbd2_journal_start() 2697 * 2698 */ 2699 2700 #ifdef CONFIG_QUOTA 2701 2702 static inline struct inode *dquot_to_inode(struct dquot *dquot) 2703 { 2704 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; 2705 } 2706 2707 static int ext4_dquot_initialize(struct inode *inode, int type) 2708 { 2709 handle_t *handle; 2710 int ret, err; 2711 2712 /* We may create quota structure so we need to reserve enough blocks */ 2713 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb)); 2714 if (IS_ERR(handle)) 2715 return PTR_ERR(handle); 2716 ret = dquot_initialize(inode, type); 2717 err = ext4_journal_stop(handle); 2718 if (!ret) 2719 ret = err; 2720 return ret; 2721 } 2722 2723 static int ext4_dquot_drop(struct inode *inode) 2724 { 2725 handle_t *handle; 2726 int ret, err; 2727 2728 /* We may delete quota structure so we need to reserve enough blocks */ 2729 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb)); 2730 if (IS_ERR(handle)) 2731 return PTR_ERR(handle); 2732 ret = dquot_drop(inode); 2733 err = ext4_journal_stop(handle); 2734 if (!ret) 2735 ret = err; 2736 return ret; 2737 } 2738 2739 static int ext4_write_dquot(struct dquot *dquot) 2740 { 2741 int ret, err; 2742 handle_t *handle; 2743 struct inode *inode; 2744 2745 inode = dquot_to_inode(dquot); 2746 handle = ext4_journal_start(inode, 2747 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 2748 if (IS_ERR(handle)) 2749 return PTR_ERR(handle); 2750 ret = dquot_commit(dquot); 2751 err = ext4_journal_stop(handle); 2752 if (!ret) 2753 ret = err; 2754 return ret; 2755 } 2756 2757 static int ext4_acquire_dquot(struct dquot *dquot) 2758 { 2759 int ret, err; 2760 handle_t *handle; 2761 2762 handle = ext4_journal_start(dquot_to_inode(dquot), 2763 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 2764 if (IS_ERR(handle)) 2765 return PTR_ERR(handle); 2766 ret = dquot_acquire(dquot); 2767 err = ext4_journal_stop(handle); 2768 if (!ret) 2769 ret = err; 2770 return ret; 2771 } 2772 2773 static int ext4_release_dquot(struct dquot *dquot) 2774 { 2775 int ret, err; 2776 handle_t *handle; 2777 2778 handle = ext4_journal_start(dquot_to_inode(dquot), 2779 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 2780 if (IS_ERR(handle)) { 2781 /* Release dquot anyway to avoid endless cycle in dqput() */ 2782 dquot_release(dquot); 2783 return PTR_ERR(handle); 2784 } 2785 ret = dquot_release(dquot); 2786 err = ext4_journal_stop(handle); 2787 if (!ret) 2788 ret = err; 2789 return ret; 2790 } 2791 2792 static int ext4_mark_dquot_dirty(struct dquot *dquot) 2793 { 2794 /* Are we journalling quotas? */ 2795 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || 2796 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { 2797 dquot_mark_dquot_dirty(dquot); 2798 return ext4_write_dquot(dquot); 2799 } else { 2800 return dquot_mark_dquot_dirty(dquot); 2801 } 2802 } 2803 2804 static int ext4_write_info(struct super_block *sb, int type) 2805 { 2806 int ret, err; 2807 handle_t *handle; 2808 2809 /* Data block + inode block */ 2810 handle = ext4_journal_start(sb->s_root->d_inode, 2); 2811 if (IS_ERR(handle)) 2812 return PTR_ERR(handle); 2813 ret = dquot_commit_info(sb, type); 2814 err = ext4_journal_stop(handle); 2815 if (!ret) 2816 ret = err; 2817 return ret; 2818 } 2819 2820 /* 2821 * Turn on quotas during mount time - we need to find 2822 * the quota file and such... 2823 */ 2824 static int ext4_quota_on_mount(struct super_block *sb, int type) 2825 { 2826 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], 2827 EXT4_SB(sb)->s_jquota_fmt, type); 2828 } 2829 2830 /* 2831 * Standard function to be called on quota_on 2832 */ 2833 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 2834 char *path) 2835 { 2836 int err; 2837 struct nameidata nd; 2838 2839 if (!test_opt(sb, QUOTA)) 2840 return -EINVAL; 2841 /* Not journalling quota? */ 2842 if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] && 2843 !EXT4_SB(sb)->s_qf_names[GRPQUOTA]) 2844 return vfs_quota_on(sb, type, format_id, path); 2845 err = path_lookup(path, LOOKUP_FOLLOW, &nd); 2846 if (err) 2847 return err; 2848 /* Quotafile not on the same filesystem? */ 2849 if (nd.mnt->mnt_sb != sb) { 2850 path_release(&nd); 2851 return -EXDEV; 2852 } 2853 /* Quotafile not of fs root? */ 2854 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode) 2855 printk(KERN_WARNING 2856 "EXT4-fs: Quota file not on filesystem root. " 2857 "Journalled quota will not work.\n"); 2858 path_release(&nd); 2859 return vfs_quota_on(sb, type, format_id, path); 2860 } 2861 2862 /* Read data from quotafile - avoid pagecache and such because we cannot afford 2863 * acquiring the locks... As quota files are never truncated and quota code 2864 * itself serializes the operations (and noone else should touch the files) 2865 * we don't have to be afraid of races */ 2866 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 2867 size_t len, loff_t off) 2868 { 2869 struct inode *inode = sb_dqopt(sb)->files[type]; 2870 sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 2871 int err = 0; 2872 int offset = off & (sb->s_blocksize - 1); 2873 int tocopy; 2874 size_t toread; 2875 struct buffer_head *bh; 2876 loff_t i_size = i_size_read(inode); 2877 2878 if (off > i_size) 2879 return 0; 2880 if (off+len > i_size) 2881 len = i_size-off; 2882 toread = len; 2883 while (toread > 0) { 2884 tocopy = sb->s_blocksize - offset < toread ? 2885 sb->s_blocksize - offset : toread; 2886 bh = ext4_bread(NULL, inode, blk, 0, &err); 2887 if (err) 2888 return err; 2889 if (!bh) /* A hole? */ 2890 memset(data, 0, tocopy); 2891 else 2892 memcpy(data, bh->b_data+offset, tocopy); 2893 brelse(bh); 2894 offset = 0; 2895 toread -= tocopy; 2896 data += tocopy; 2897 blk++; 2898 } 2899 return len; 2900 } 2901 2902 /* Write to quotafile (we know the transaction is already started and has 2903 * enough credits) */ 2904 static ssize_t ext4_quota_write(struct super_block *sb, int type, 2905 const char *data, size_t len, loff_t off) 2906 { 2907 struct inode *inode = sb_dqopt(sb)->files[type]; 2908 sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 2909 int err = 0; 2910 int offset = off & (sb->s_blocksize - 1); 2911 int tocopy; 2912 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL; 2913 size_t towrite = len; 2914 struct buffer_head *bh; 2915 handle_t *handle = journal_current_handle(); 2916 2917 if (!handle) { 2918 printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)" 2919 " cancelled because transaction is not started.\n", 2920 (unsigned long long)off, (unsigned long long)len); 2921 return -EIO; 2922 } 2923 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 2924 while (towrite > 0) { 2925 tocopy = sb->s_blocksize - offset < towrite ? 2926 sb->s_blocksize - offset : towrite; 2927 bh = ext4_bread(handle, inode, blk, 1, &err); 2928 if (!bh) 2929 goto out; 2930 if (journal_quota) { 2931 err = ext4_journal_get_write_access(handle, bh); 2932 if (err) { 2933 brelse(bh); 2934 goto out; 2935 } 2936 } 2937 lock_buffer(bh); 2938 memcpy(bh->b_data+offset, data, tocopy); 2939 flush_dcache_page(bh->b_page); 2940 unlock_buffer(bh); 2941 if (journal_quota) 2942 err = ext4_journal_dirty_metadata(handle, bh); 2943 else { 2944 /* Always do at least ordered writes for quotas */ 2945 err = ext4_journal_dirty_data(handle, bh); 2946 mark_buffer_dirty(bh); 2947 } 2948 brelse(bh); 2949 if (err) 2950 goto out; 2951 offset = 0; 2952 towrite -= tocopy; 2953 data += tocopy; 2954 blk++; 2955 } 2956 out: 2957 if (len == towrite) 2958 return err; 2959 if (inode->i_size < off+len-towrite) { 2960 i_size_write(inode, off+len-towrite); 2961 EXT4_I(inode)->i_disksize = inode->i_size; 2962 } 2963 inode->i_version++; 2964 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 2965 ext4_mark_inode_dirty(handle, inode); 2966 mutex_unlock(&inode->i_mutex); 2967 return len - towrite; 2968 } 2969 2970 #endif 2971 2972 static int ext4_get_sb(struct file_system_type *fs_type, 2973 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 2974 { 2975 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt); 2976 } 2977 2978 static struct file_system_type ext4dev_fs_type = { 2979 .owner = THIS_MODULE, 2980 .name = "ext4dev", 2981 .get_sb = ext4_get_sb, 2982 .kill_sb = kill_block_super, 2983 .fs_flags = FS_REQUIRES_DEV, 2984 }; 2985 2986 static int __init init_ext4_fs(void) 2987 { 2988 int err = init_ext4_xattr(); 2989 if (err) 2990 return err; 2991 err = init_inodecache(); 2992 if (err) 2993 goto out1; 2994 err = register_filesystem(&ext4dev_fs_type); 2995 if (err) 2996 goto out; 2997 return 0; 2998 out: 2999 destroy_inodecache(); 3000 out1: 3001 exit_ext4_xattr(); 3002 return err; 3003 } 3004 3005 static void __exit exit_ext4_fs(void) 3006 { 3007 unregister_filesystem(&ext4dev_fs_type); 3008 destroy_inodecache(); 3009 exit_ext4_xattr(); 3010 } 3011 3012 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); 3013 MODULE_DESCRIPTION("Fourth Extended Filesystem with extents"); 3014 MODULE_LICENSE("GPL"); 3015 module_init(init_ext4_fs) 3016 module_exit(exit_ext4_fs) 3017