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/slab.h> 25 #include <linux/init.h> 26 #include <linux/blkdev.h> 27 #include <linux/parser.h> 28 #include <linux/smp_lock.h> 29 #include <linux/buffer_head.h> 30 #include <linux/exportfs.h> 31 #include <linux/vfs.h> 32 #include <linux/random.h> 33 #include <linux/mount.h> 34 #include <linux/namei.h> 35 #include <linux/quotaops.h> 36 #include <linux/seq_file.h> 37 #include <linux/proc_fs.h> 38 #include <linux/marker.h> 39 #include <linux/log2.h> 40 #include <linux/crc16.h> 41 #include <asm/uaccess.h> 42 43 #include "ext4.h" 44 #include "ext4_jbd2.h" 45 #include "xattr.h" 46 #include "acl.h" 47 #include "namei.h" 48 #include "group.h" 49 50 struct proc_dir_entry *ext4_proc_root; 51 52 static int ext4_load_journal(struct super_block *, struct ext4_super_block *, 53 unsigned long journal_devnum); 54 static int ext4_create_journal(struct super_block *, struct ext4_super_block *, 55 unsigned int); 56 static void ext4_commit_super(struct super_block *sb, 57 struct ext4_super_block *es, int sync); 58 static void ext4_mark_recovery_complete(struct super_block *sb, 59 struct ext4_super_block *es); 60 static void ext4_clear_journal_err(struct super_block *sb, 61 struct ext4_super_block *es); 62 static int ext4_sync_fs(struct super_block *sb, int wait); 63 static const char *ext4_decode_error(struct super_block *sb, int errno, 64 char nbuf[16]); 65 static int ext4_remount(struct super_block *sb, int *flags, char *data); 66 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf); 67 static void ext4_unlockfs(struct super_block *sb); 68 static void ext4_write_super(struct super_block *sb); 69 static void ext4_write_super_lockfs(struct super_block *sb); 70 71 72 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 73 struct ext4_group_desc *bg) 74 { 75 return le32_to_cpu(bg->bg_block_bitmap_lo) | 76 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 77 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); 78 } 79 80 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 81 struct ext4_group_desc *bg) 82 { 83 return le32_to_cpu(bg->bg_inode_bitmap_lo) | 84 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 85 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); 86 } 87 88 ext4_fsblk_t ext4_inode_table(struct super_block *sb, 89 struct ext4_group_desc *bg) 90 { 91 return le32_to_cpu(bg->bg_inode_table_lo) | 92 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 93 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); 94 } 95 96 void ext4_block_bitmap_set(struct super_block *sb, 97 struct ext4_group_desc *bg, ext4_fsblk_t blk) 98 { 99 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); 100 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 101 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); 102 } 103 104 void ext4_inode_bitmap_set(struct super_block *sb, 105 struct ext4_group_desc *bg, ext4_fsblk_t blk) 106 { 107 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); 108 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 109 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); 110 } 111 112 void ext4_inode_table_set(struct super_block *sb, 113 struct ext4_group_desc *bg, ext4_fsblk_t blk) 114 { 115 bg->bg_inode_table_lo = cpu_to_le32((u32)blk); 116 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 117 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); 118 } 119 120 /* 121 * Wrappers for jbd2_journal_start/end. 122 * 123 * The only special thing we need to do here is to make sure that all 124 * journal_end calls result in the superblock being marked dirty, so 125 * that sync() will call the filesystem's write_super callback if 126 * appropriate. 127 */ 128 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) 129 { 130 journal_t *journal; 131 132 if (sb->s_flags & MS_RDONLY) 133 return ERR_PTR(-EROFS); 134 135 /* Special case here: if the journal has aborted behind our 136 * backs (eg. EIO in the commit thread), then we still need to 137 * take the FS itself readonly cleanly. */ 138 journal = EXT4_SB(sb)->s_journal; 139 if (is_journal_aborted(journal)) { 140 ext4_abort(sb, __func__, 141 "Detected aborted journal"); 142 return ERR_PTR(-EROFS); 143 } 144 145 return jbd2_journal_start(journal, nblocks); 146 } 147 148 /* 149 * The only special thing we need to do here is to make sure that all 150 * jbd2_journal_stop calls result in the superblock being marked dirty, so 151 * that sync() will call the filesystem's write_super callback if 152 * appropriate. 153 */ 154 int __ext4_journal_stop(const char *where, handle_t *handle) 155 { 156 struct super_block *sb; 157 int err; 158 int rc; 159 160 sb = handle->h_transaction->t_journal->j_private; 161 err = handle->h_err; 162 rc = jbd2_journal_stop(handle); 163 164 if (!err) 165 err = rc; 166 if (err) 167 __ext4_std_error(sb, where, err); 168 return err; 169 } 170 171 void ext4_journal_abort_handle(const char *caller, const char *err_fn, 172 struct buffer_head *bh, handle_t *handle, int err) 173 { 174 char nbuf[16]; 175 const char *errstr = ext4_decode_error(NULL, err, nbuf); 176 177 if (bh) 178 BUFFER_TRACE(bh, "abort"); 179 180 if (!handle->h_err) 181 handle->h_err = err; 182 183 if (is_handle_aborted(handle)) 184 return; 185 186 printk(KERN_ERR "%s: aborting transaction: %s in %s\n", 187 caller, errstr, err_fn); 188 189 jbd2_journal_abort_handle(handle); 190 } 191 192 /* Deal with the reporting of failure conditions on a filesystem such as 193 * inconsistencies detected or read IO failures. 194 * 195 * On ext2, we can store the error state of the filesystem in the 196 * superblock. That is not possible on ext4, because we may have other 197 * write ordering constraints on the superblock which prevent us from 198 * writing it out straight away; and given that the journal is about to 199 * be aborted, we can't rely on the current, or future, transactions to 200 * write out the superblock safely. 201 * 202 * We'll just use the jbd2_journal_abort() error code to record an error in 203 * the journal instead. On recovery, the journal will compain about 204 * that error until we've noted it down and cleared it. 205 */ 206 207 static void ext4_handle_error(struct super_block *sb) 208 { 209 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 210 211 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 212 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 213 214 if (sb->s_flags & MS_RDONLY) 215 return; 216 217 if (!test_opt(sb, ERRORS_CONT)) { 218 journal_t *journal = EXT4_SB(sb)->s_journal; 219 220 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; 221 if (journal) 222 jbd2_journal_abort(journal, -EIO); 223 } 224 if (test_opt(sb, ERRORS_RO)) { 225 printk(KERN_CRIT "Remounting filesystem read-only\n"); 226 sb->s_flags |= MS_RDONLY; 227 } 228 ext4_commit_super(sb, es, 1); 229 if (test_opt(sb, ERRORS_PANIC)) 230 panic("EXT4-fs (device %s): panic forced after error\n", 231 sb->s_id); 232 } 233 234 void ext4_error(struct super_block *sb, const char *function, 235 const char *fmt, ...) 236 { 237 va_list args; 238 239 va_start(args, fmt); 240 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function); 241 vprintk(fmt, args); 242 printk("\n"); 243 va_end(args); 244 245 ext4_handle_error(sb); 246 } 247 248 static const char *ext4_decode_error(struct super_block *sb, int errno, 249 char nbuf[16]) 250 { 251 char *errstr = NULL; 252 253 switch (errno) { 254 case -EIO: 255 errstr = "IO failure"; 256 break; 257 case -ENOMEM: 258 errstr = "Out of memory"; 259 break; 260 case -EROFS: 261 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT) 262 errstr = "Journal has aborted"; 263 else 264 errstr = "Readonly filesystem"; 265 break; 266 default: 267 /* If the caller passed in an extra buffer for unknown 268 * errors, textualise them now. Else we just return 269 * NULL. */ 270 if (nbuf) { 271 /* Check for truncated error codes... */ 272 if (snprintf(nbuf, 16, "error %d", -errno) >= 0) 273 errstr = nbuf; 274 } 275 break; 276 } 277 278 return errstr; 279 } 280 281 /* __ext4_std_error decodes expected errors from journaling functions 282 * automatically and invokes the appropriate error response. */ 283 284 void __ext4_std_error(struct super_block *sb, const char *function, int errno) 285 { 286 char nbuf[16]; 287 const char *errstr; 288 289 /* Special case: if the error is EROFS, and we're not already 290 * inside a transaction, then there's really no point in logging 291 * an error. */ 292 if (errno == -EROFS && journal_current_handle() == NULL && 293 (sb->s_flags & MS_RDONLY)) 294 return; 295 296 errstr = ext4_decode_error(sb, errno, nbuf); 297 printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n", 298 sb->s_id, function, errstr); 299 300 ext4_handle_error(sb); 301 } 302 303 /* 304 * ext4_abort is a much stronger failure handler than ext4_error. The 305 * abort function may be used to deal with unrecoverable failures such 306 * as journal IO errors or ENOMEM at a critical moment in log management. 307 * 308 * We unconditionally force the filesystem into an ABORT|READONLY state, 309 * unless the error response on the fs has been set to panic in which 310 * case we take the easy way out and panic immediately. 311 */ 312 313 void ext4_abort(struct super_block *sb, const char *function, 314 const char *fmt, ...) 315 { 316 va_list args; 317 318 printk(KERN_CRIT "ext4_abort called.\n"); 319 320 va_start(args, fmt); 321 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function); 322 vprintk(fmt, args); 323 printk("\n"); 324 va_end(args); 325 326 if (test_opt(sb, ERRORS_PANIC)) 327 panic("EXT4-fs panic from previous error\n"); 328 329 if (sb->s_flags & MS_RDONLY) 330 return; 331 332 printk(KERN_CRIT "Remounting filesystem read-only\n"); 333 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 334 sb->s_flags |= MS_RDONLY; 335 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; 336 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); 337 } 338 339 void ext4_warning(struct super_block *sb, const char *function, 340 const char *fmt, ...) 341 { 342 va_list args; 343 344 va_start(args, fmt); 345 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ", 346 sb->s_id, function); 347 vprintk(fmt, args); 348 printk("\n"); 349 va_end(args); 350 } 351 352 void ext4_update_dynamic_rev(struct super_block *sb) 353 { 354 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 355 356 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) 357 return; 358 359 ext4_warning(sb, __func__, 360 "updating to rev %d because of new feature flag, " 361 "running e2fsck is recommended", 362 EXT4_DYNAMIC_REV); 363 364 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); 365 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); 366 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); 367 /* leave es->s_feature_*compat flags alone */ 368 /* es->s_uuid will be set by e2fsck if empty */ 369 370 /* 371 * The rest of the superblock fields should be zero, and if not it 372 * means they are likely already in use, so leave them alone. We 373 * can leave it up to e2fsck to clean up any inconsistencies there. 374 */ 375 } 376 377 int ext4_update_compat_feature(handle_t *handle, 378 struct super_block *sb, __u32 compat) 379 { 380 int err = 0; 381 if (!EXT4_HAS_COMPAT_FEATURE(sb, compat)) { 382 err = ext4_journal_get_write_access(handle, 383 EXT4_SB(sb)->s_sbh); 384 if (err) 385 return err; 386 EXT4_SET_COMPAT_FEATURE(sb, compat); 387 sb->s_dirt = 1; 388 handle->h_sync = 1; 389 BUFFER_TRACE(EXT4_SB(sb)->s_sbh, 390 "call ext4_journal_dirty_met adata"); 391 err = ext4_journal_dirty_metadata(handle, 392 EXT4_SB(sb)->s_sbh); 393 } 394 return err; 395 } 396 397 int ext4_update_rocompat_feature(handle_t *handle, 398 struct super_block *sb, __u32 rocompat) 399 { 400 int err = 0; 401 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, rocompat)) { 402 err = ext4_journal_get_write_access(handle, 403 EXT4_SB(sb)->s_sbh); 404 if (err) 405 return err; 406 EXT4_SET_RO_COMPAT_FEATURE(sb, rocompat); 407 sb->s_dirt = 1; 408 handle->h_sync = 1; 409 BUFFER_TRACE(EXT4_SB(sb)->s_sbh, 410 "call ext4_journal_dirty_met adata"); 411 err = ext4_journal_dirty_metadata(handle, 412 EXT4_SB(sb)->s_sbh); 413 } 414 return err; 415 } 416 417 int ext4_update_incompat_feature(handle_t *handle, 418 struct super_block *sb, __u32 incompat) 419 { 420 int err = 0; 421 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, incompat)) { 422 err = ext4_journal_get_write_access(handle, 423 EXT4_SB(sb)->s_sbh); 424 if (err) 425 return err; 426 EXT4_SET_INCOMPAT_FEATURE(sb, incompat); 427 sb->s_dirt = 1; 428 handle->h_sync = 1; 429 BUFFER_TRACE(EXT4_SB(sb)->s_sbh, 430 "call ext4_journal_dirty_met adata"); 431 err = ext4_journal_dirty_metadata(handle, 432 EXT4_SB(sb)->s_sbh); 433 } 434 return err; 435 } 436 437 /* 438 * Open the external journal device 439 */ 440 static struct block_device *ext4_blkdev_get(dev_t dev) 441 { 442 struct block_device *bdev; 443 char b[BDEVNAME_SIZE]; 444 445 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); 446 if (IS_ERR(bdev)) 447 goto fail; 448 return bdev; 449 450 fail: 451 printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n", 452 __bdevname(dev, b), PTR_ERR(bdev)); 453 return NULL; 454 } 455 456 /* 457 * Release the journal device 458 */ 459 static int ext4_blkdev_put(struct block_device *bdev) 460 { 461 bd_release(bdev); 462 return blkdev_put(bdev); 463 } 464 465 static int ext4_blkdev_remove(struct ext4_sb_info *sbi) 466 { 467 struct block_device *bdev; 468 int ret = -ENODEV; 469 470 bdev = sbi->journal_bdev; 471 if (bdev) { 472 ret = ext4_blkdev_put(bdev); 473 sbi->journal_bdev = NULL; 474 } 475 return ret; 476 } 477 478 static inline struct inode *orphan_list_entry(struct list_head *l) 479 { 480 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; 481 } 482 483 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) 484 { 485 struct list_head *l; 486 487 printk(KERN_ERR "sb orphan head is %d\n", 488 le32_to_cpu(sbi->s_es->s_last_orphan)); 489 490 printk(KERN_ERR "sb_info orphan list:\n"); 491 list_for_each(l, &sbi->s_orphan) { 492 struct inode *inode = orphan_list_entry(l); 493 printk(KERN_ERR " " 494 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", 495 inode->i_sb->s_id, inode->i_ino, inode, 496 inode->i_mode, inode->i_nlink, 497 NEXT_ORPHAN(inode)); 498 } 499 } 500 501 static void ext4_put_super(struct super_block *sb) 502 { 503 struct ext4_sb_info *sbi = EXT4_SB(sb); 504 struct ext4_super_block *es = sbi->s_es; 505 int i; 506 507 ext4_mb_release(sb); 508 ext4_ext_release(sb); 509 ext4_xattr_put_super(sb); 510 if (jbd2_journal_destroy(sbi->s_journal) < 0) 511 ext4_abort(sb, __func__, "Couldn't clean up the journal"); 512 sbi->s_journal = NULL; 513 if (!(sb->s_flags & MS_RDONLY)) { 514 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 515 es->s_state = cpu_to_le16(sbi->s_mount_state); 516 ext4_commit_super(sb, es, 1); 517 } 518 if (sbi->s_proc) { 519 remove_proc_entry("inode_readahead_blks", sbi->s_proc); 520 remove_proc_entry(sb->s_id, ext4_proc_root); 521 } 522 523 for (i = 0; i < sbi->s_gdb_count; i++) 524 brelse(sbi->s_group_desc[i]); 525 kfree(sbi->s_group_desc); 526 kfree(sbi->s_flex_groups); 527 percpu_counter_destroy(&sbi->s_freeblocks_counter); 528 percpu_counter_destroy(&sbi->s_freeinodes_counter); 529 percpu_counter_destroy(&sbi->s_dirs_counter); 530 percpu_counter_destroy(&sbi->s_dirtyblocks_counter); 531 brelse(sbi->s_sbh); 532 #ifdef CONFIG_QUOTA 533 for (i = 0; i < MAXQUOTAS; i++) 534 kfree(sbi->s_qf_names[i]); 535 #endif 536 537 /* Debugging code just in case the in-memory inode orphan list 538 * isn't empty. The on-disk one can be non-empty if we've 539 * detected an error and taken the fs readonly, but the 540 * in-memory list had better be clean by this point. */ 541 if (!list_empty(&sbi->s_orphan)) 542 dump_orphan_list(sb, sbi); 543 J_ASSERT(list_empty(&sbi->s_orphan)); 544 545 invalidate_bdev(sb->s_bdev); 546 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { 547 /* 548 * Invalidate the journal device's buffers. We don't want them 549 * floating about in memory - the physical journal device may 550 * hotswapped, and it breaks the `ro-after' testing code. 551 */ 552 sync_blockdev(sbi->journal_bdev); 553 invalidate_bdev(sbi->journal_bdev); 554 ext4_blkdev_remove(sbi); 555 } 556 sb->s_fs_info = NULL; 557 kfree(sbi); 558 return; 559 } 560 561 static struct kmem_cache *ext4_inode_cachep; 562 563 /* 564 * Called inside transaction, so use GFP_NOFS 565 */ 566 static struct inode *ext4_alloc_inode(struct super_block *sb) 567 { 568 struct ext4_inode_info *ei; 569 570 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); 571 if (!ei) 572 return NULL; 573 #ifdef CONFIG_EXT4_FS_POSIX_ACL 574 ei->i_acl = EXT4_ACL_NOT_CACHED; 575 ei->i_default_acl = EXT4_ACL_NOT_CACHED; 576 #endif 577 ei->vfs_inode.i_version = 1; 578 ei->vfs_inode.i_data.writeback_index = 0; 579 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); 580 INIT_LIST_HEAD(&ei->i_prealloc_list); 581 spin_lock_init(&ei->i_prealloc_lock); 582 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode); 583 ei->i_reserved_data_blocks = 0; 584 ei->i_reserved_meta_blocks = 0; 585 ei->i_allocated_meta_blocks = 0; 586 ei->i_delalloc_reserved_flag = 0; 587 spin_lock_init(&(ei->i_block_reservation_lock)); 588 return &ei->vfs_inode; 589 } 590 591 static void ext4_destroy_inode(struct inode *inode) 592 { 593 if (!list_empty(&(EXT4_I(inode)->i_orphan))) { 594 printk("EXT4 Inode %p: orphan list check failed!\n", 595 EXT4_I(inode)); 596 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, 597 EXT4_I(inode), sizeof(struct ext4_inode_info), 598 true); 599 dump_stack(); 600 } 601 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); 602 } 603 604 static void init_once(void *foo) 605 { 606 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; 607 608 INIT_LIST_HEAD(&ei->i_orphan); 609 #ifdef CONFIG_EXT4_FS_XATTR 610 init_rwsem(&ei->xattr_sem); 611 #endif 612 init_rwsem(&ei->i_data_sem); 613 inode_init_once(&ei->vfs_inode); 614 } 615 616 static int init_inodecache(void) 617 { 618 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", 619 sizeof(struct ext4_inode_info), 620 0, (SLAB_RECLAIM_ACCOUNT| 621 SLAB_MEM_SPREAD), 622 init_once); 623 if (ext4_inode_cachep == NULL) 624 return -ENOMEM; 625 return 0; 626 } 627 628 static void destroy_inodecache(void) 629 { 630 kmem_cache_destroy(ext4_inode_cachep); 631 } 632 633 static void ext4_clear_inode(struct inode *inode) 634 { 635 #ifdef CONFIG_EXT4_FS_POSIX_ACL 636 if (EXT4_I(inode)->i_acl && 637 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) { 638 posix_acl_release(EXT4_I(inode)->i_acl); 639 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED; 640 } 641 if (EXT4_I(inode)->i_default_acl && 642 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) { 643 posix_acl_release(EXT4_I(inode)->i_default_acl); 644 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED; 645 } 646 #endif 647 ext4_discard_preallocations(inode); 648 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal, 649 &EXT4_I(inode)->jinode); 650 } 651 652 static inline void ext4_show_quota_options(struct seq_file *seq, 653 struct super_block *sb) 654 { 655 #if defined(CONFIG_QUOTA) 656 struct ext4_sb_info *sbi = EXT4_SB(sb); 657 658 if (sbi->s_jquota_fmt) 659 seq_printf(seq, ",jqfmt=%s", 660 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold" : "vfsv0"); 661 662 if (sbi->s_qf_names[USRQUOTA]) 663 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); 664 665 if (sbi->s_qf_names[GRPQUOTA]) 666 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); 667 668 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) 669 seq_puts(seq, ",usrquota"); 670 671 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) 672 seq_puts(seq, ",grpquota"); 673 #endif 674 } 675 676 /* 677 * Show an option if 678 * - it's set to a non-default value OR 679 * - if the per-sb default is different from the global default 680 */ 681 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs) 682 { 683 int def_errors; 684 unsigned long def_mount_opts; 685 struct super_block *sb = vfs->mnt_sb; 686 struct ext4_sb_info *sbi = EXT4_SB(sb); 687 struct ext4_super_block *es = sbi->s_es; 688 689 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 690 def_errors = le16_to_cpu(es->s_errors); 691 692 if (sbi->s_sb_block != 1) 693 seq_printf(seq, ",sb=%llu", sbi->s_sb_block); 694 if (test_opt(sb, MINIX_DF)) 695 seq_puts(seq, ",minixdf"); 696 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS)) 697 seq_puts(seq, ",grpid"); 698 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS)) 699 seq_puts(seq, ",nogrpid"); 700 if (sbi->s_resuid != EXT4_DEF_RESUID || 701 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) { 702 seq_printf(seq, ",resuid=%u", sbi->s_resuid); 703 } 704 if (sbi->s_resgid != EXT4_DEF_RESGID || 705 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) { 706 seq_printf(seq, ",resgid=%u", sbi->s_resgid); 707 } 708 if (test_opt(sb, ERRORS_RO)) { 709 if (def_errors == EXT4_ERRORS_PANIC || 710 def_errors == EXT4_ERRORS_CONTINUE) { 711 seq_puts(seq, ",errors=remount-ro"); 712 } 713 } 714 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) 715 seq_puts(seq, ",errors=continue"); 716 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) 717 seq_puts(seq, ",errors=panic"); 718 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16)) 719 seq_puts(seq, ",nouid32"); 720 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG)) 721 seq_puts(seq, ",debug"); 722 if (test_opt(sb, OLDALLOC)) 723 seq_puts(seq, ",oldalloc"); 724 #ifdef CONFIG_EXT4_FS_XATTR 725 if (test_opt(sb, XATTR_USER) && 726 !(def_mount_opts & EXT4_DEFM_XATTR_USER)) 727 seq_puts(seq, ",user_xattr"); 728 if (!test_opt(sb, XATTR_USER) && 729 (def_mount_opts & EXT4_DEFM_XATTR_USER)) { 730 seq_puts(seq, ",nouser_xattr"); 731 } 732 #endif 733 #ifdef CONFIG_EXT4_FS_POSIX_ACL 734 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL)) 735 seq_puts(seq, ",acl"); 736 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL)) 737 seq_puts(seq, ",noacl"); 738 #endif 739 if (!test_opt(sb, RESERVATION)) 740 seq_puts(seq, ",noreservation"); 741 if (sbi->s_commit_interval) { 742 seq_printf(seq, ",commit=%u", 743 (unsigned) (sbi->s_commit_interval / HZ)); 744 } 745 /* 746 * We're changing the default of barrier mount option, so 747 * let's always display its mount state so it's clear what its 748 * status is. 749 */ 750 seq_puts(seq, ",barrier="); 751 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0"); 752 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) 753 seq_puts(seq, ",journal_async_commit"); 754 if (test_opt(sb, NOBH)) 755 seq_puts(seq, ",nobh"); 756 if (!test_opt(sb, EXTENTS)) 757 seq_puts(seq, ",noextents"); 758 if (test_opt(sb, I_VERSION)) 759 seq_puts(seq, ",i_version"); 760 if (!test_opt(sb, DELALLOC)) 761 seq_puts(seq, ",nodelalloc"); 762 763 764 if (sbi->s_stripe) 765 seq_printf(seq, ",stripe=%lu", sbi->s_stripe); 766 /* 767 * journal mode get enabled in different ways 768 * So just print the value even if we didn't specify it 769 */ 770 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 771 seq_puts(seq, ",data=journal"); 772 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 773 seq_puts(seq, ",data=ordered"); 774 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) 775 seq_puts(seq, ",data=writeback"); 776 777 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS) 778 seq_printf(seq, ",inode_readahead_blks=%u", 779 sbi->s_inode_readahead_blks); 780 781 if (test_opt(sb, DATA_ERR_ABORT)) 782 seq_puts(seq, ",data_err=abort"); 783 784 ext4_show_quota_options(seq, sb); 785 return 0; 786 } 787 788 789 static struct inode *ext4_nfs_get_inode(struct super_block *sb, 790 u64 ino, u32 generation) 791 { 792 struct inode *inode; 793 794 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) 795 return ERR_PTR(-ESTALE); 796 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) 797 return ERR_PTR(-ESTALE); 798 799 /* iget isn't really right if the inode is currently unallocated!! 800 * 801 * ext4_read_inode will return a bad_inode if the inode had been 802 * deleted, so we should be safe. 803 * 804 * Currently we don't know the generation for parent directory, so 805 * a generation of 0 means "accept any" 806 */ 807 inode = ext4_iget(sb, ino); 808 if (IS_ERR(inode)) 809 return ERR_CAST(inode); 810 if (generation && inode->i_generation != generation) { 811 iput(inode); 812 return ERR_PTR(-ESTALE); 813 } 814 815 return inode; 816 } 817 818 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, 819 int fh_len, int fh_type) 820 { 821 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 822 ext4_nfs_get_inode); 823 } 824 825 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, 826 int fh_len, int fh_type) 827 { 828 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 829 ext4_nfs_get_inode); 830 } 831 832 #ifdef CONFIG_QUOTA 833 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group") 834 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) 835 836 static int ext4_dquot_initialize(struct inode *inode, int type); 837 static int ext4_dquot_drop(struct inode *inode); 838 static int ext4_write_dquot(struct dquot *dquot); 839 static int ext4_acquire_dquot(struct dquot *dquot); 840 static int ext4_release_dquot(struct dquot *dquot); 841 static int ext4_mark_dquot_dirty(struct dquot *dquot); 842 static int ext4_write_info(struct super_block *sb, int type); 843 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 844 char *path, int remount); 845 static int ext4_quota_on_mount(struct super_block *sb, int type); 846 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 847 size_t len, loff_t off); 848 static ssize_t ext4_quota_write(struct super_block *sb, int type, 849 const char *data, size_t len, loff_t off); 850 851 static struct dquot_operations ext4_quota_operations = { 852 .initialize = ext4_dquot_initialize, 853 .drop = ext4_dquot_drop, 854 .alloc_space = dquot_alloc_space, 855 .alloc_inode = dquot_alloc_inode, 856 .free_space = dquot_free_space, 857 .free_inode = dquot_free_inode, 858 .transfer = dquot_transfer, 859 .write_dquot = ext4_write_dquot, 860 .acquire_dquot = ext4_acquire_dquot, 861 .release_dquot = ext4_release_dquot, 862 .mark_dirty = ext4_mark_dquot_dirty, 863 .write_info = ext4_write_info 864 }; 865 866 static struct quotactl_ops ext4_qctl_operations = { 867 .quota_on = ext4_quota_on, 868 .quota_off = vfs_quota_off, 869 .quota_sync = vfs_quota_sync, 870 .get_info = vfs_get_dqinfo, 871 .set_info = vfs_set_dqinfo, 872 .get_dqblk = vfs_get_dqblk, 873 .set_dqblk = vfs_set_dqblk 874 }; 875 #endif 876 877 static const struct super_operations ext4_sops = { 878 .alloc_inode = ext4_alloc_inode, 879 .destroy_inode = ext4_destroy_inode, 880 .write_inode = ext4_write_inode, 881 .dirty_inode = ext4_dirty_inode, 882 .delete_inode = ext4_delete_inode, 883 .put_super = ext4_put_super, 884 .write_super = ext4_write_super, 885 .sync_fs = ext4_sync_fs, 886 .write_super_lockfs = ext4_write_super_lockfs, 887 .unlockfs = ext4_unlockfs, 888 .statfs = ext4_statfs, 889 .remount_fs = ext4_remount, 890 .clear_inode = ext4_clear_inode, 891 .show_options = ext4_show_options, 892 #ifdef CONFIG_QUOTA 893 .quota_read = ext4_quota_read, 894 .quota_write = ext4_quota_write, 895 #endif 896 }; 897 898 static const struct export_operations ext4_export_ops = { 899 .fh_to_dentry = ext4_fh_to_dentry, 900 .fh_to_parent = ext4_fh_to_parent, 901 .get_parent = ext4_get_parent, 902 }; 903 904 enum { 905 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 906 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, 907 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov, 908 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, 909 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh, 910 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev, 911 Opt_journal_checksum, Opt_journal_async_commit, 912 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, 913 Opt_data_err_abort, Opt_data_err_ignore, 914 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, 915 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota, 916 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota, 917 Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version, 918 Opt_mballoc, Opt_nomballoc, Opt_stripe, Opt_delalloc, Opt_nodelalloc, 919 Opt_inode_readahead_blks 920 }; 921 922 static const match_table_t tokens = { 923 {Opt_bsd_df, "bsddf"}, 924 {Opt_minix_df, "minixdf"}, 925 {Opt_grpid, "grpid"}, 926 {Opt_grpid, "bsdgroups"}, 927 {Opt_nogrpid, "nogrpid"}, 928 {Opt_nogrpid, "sysvgroups"}, 929 {Opt_resgid, "resgid=%u"}, 930 {Opt_resuid, "resuid=%u"}, 931 {Opt_sb, "sb=%u"}, 932 {Opt_err_cont, "errors=continue"}, 933 {Opt_err_panic, "errors=panic"}, 934 {Opt_err_ro, "errors=remount-ro"}, 935 {Opt_nouid32, "nouid32"}, 936 {Opt_nocheck, "nocheck"}, 937 {Opt_nocheck, "check=none"}, 938 {Opt_debug, "debug"}, 939 {Opt_oldalloc, "oldalloc"}, 940 {Opt_orlov, "orlov"}, 941 {Opt_user_xattr, "user_xattr"}, 942 {Opt_nouser_xattr, "nouser_xattr"}, 943 {Opt_acl, "acl"}, 944 {Opt_noacl, "noacl"}, 945 {Opt_reservation, "reservation"}, 946 {Opt_noreservation, "noreservation"}, 947 {Opt_noload, "noload"}, 948 {Opt_nobh, "nobh"}, 949 {Opt_bh, "bh"}, 950 {Opt_commit, "commit=%u"}, 951 {Opt_journal_update, "journal=update"}, 952 {Opt_journal_inum, "journal=%u"}, 953 {Opt_journal_dev, "journal_dev=%u"}, 954 {Opt_journal_checksum, "journal_checksum"}, 955 {Opt_journal_async_commit, "journal_async_commit"}, 956 {Opt_abort, "abort"}, 957 {Opt_data_journal, "data=journal"}, 958 {Opt_data_ordered, "data=ordered"}, 959 {Opt_data_writeback, "data=writeback"}, 960 {Opt_data_err_abort, "data_err=abort"}, 961 {Opt_data_err_ignore, "data_err=ignore"}, 962 {Opt_offusrjquota, "usrjquota="}, 963 {Opt_usrjquota, "usrjquota=%s"}, 964 {Opt_offgrpjquota, "grpjquota="}, 965 {Opt_grpjquota, "grpjquota=%s"}, 966 {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, 967 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, 968 {Opt_grpquota, "grpquota"}, 969 {Opt_noquota, "noquota"}, 970 {Opt_quota, "quota"}, 971 {Opt_usrquota, "usrquota"}, 972 {Opt_barrier, "barrier=%u"}, 973 {Opt_extents, "extents"}, 974 {Opt_noextents, "noextents"}, 975 {Opt_i_version, "i_version"}, 976 {Opt_mballoc, "mballoc"}, 977 {Opt_nomballoc, "nomballoc"}, 978 {Opt_stripe, "stripe=%u"}, 979 {Opt_resize, "resize"}, 980 {Opt_delalloc, "delalloc"}, 981 {Opt_nodelalloc, "nodelalloc"}, 982 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"}, 983 {Opt_err, NULL}, 984 }; 985 986 static ext4_fsblk_t get_sb_block(void **data) 987 { 988 ext4_fsblk_t sb_block; 989 char *options = (char *) *data; 990 991 if (!options || strncmp(options, "sb=", 3) != 0) 992 return 1; /* Default location */ 993 options += 3; 994 /*todo: use simple_strtoll with >32bit ext4 */ 995 sb_block = simple_strtoul(options, &options, 0); 996 if (*options && *options != ',') { 997 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n", 998 (char *) *data); 999 return 1; 1000 } 1001 if (*options == ',') 1002 options++; 1003 *data = (void *) options; 1004 return sb_block; 1005 } 1006 1007 static int parse_options(char *options, struct super_block *sb, 1008 unsigned int *inum, unsigned long *journal_devnum, 1009 ext4_fsblk_t *n_blocks_count, int is_remount) 1010 { 1011 struct ext4_sb_info *sbi = EXT4_SB(sb); 1012 char *p; 1013 substring_t args[MAX_OPT_ARGS]; 1014 int data_opt = 0; 1015 int option; 1016 #ifdef CONFIG_QUOTA 1017 int qtype, qfmt; 1018 char *qname; 1019 #endif 1020 ext4_fsblk_t last_block; 1021 1022 if (!options) 1023 return 1; 1024 1025 while ((p = strsep(&options, ",")) != NULL) { 1026 int token; 1027 if (!*p) 1028 continue; 1029 1030 token = match_token(p, tokens, args); 1031 switch (token) { 1032 case Opt_bsd_df: 1033 clear_opt(sbi->s_mount_opt, MINIX_DF); 1034 break; 1035 case Opt_minix_df: 1036 set_opt(sbi->s_mount_opt, MINIX_DF); 1037 break; 1038 case Opt_grpid: 1039 set_opt(sbi->s_mount_opt, GRPID); 1040 break; 1041 case Opt_nogrpid: 1042 clear_opt(sbi->s_mount_opt, GRPID); 1043 break; 1044 case Opt_resuid: 1045 if (match_int(&args[0], &option)) 1046 return 0; 1047 sbi->s_resuid = option; 1048 break; 1049 case Opt_resgid: 1050 if (match_int(&args[0], &option)) 1051 return 0; 1052 sbi->s_resgid = option; 1053 break; 1054 case Opt_sb: 1055 /* handled by get_sb_block() instead of here */ 1056 /* *sb_block = match_int(&args[0]); */ 1057 break; 1058 case Opt_err_panic: 1059 clear_opt(sbi->s_mount_opt, ERRORS_CONT); 1060 clear_opt(sbi->s_mount_opt, ERRORS_RO); 1061 set_opt(sbi->s_mount_opt, ERRORS_PANIC); 1062 break; 1063 case Opt_err_ro: 1064 clear_opt(sbi->s_mount_opt, ERRORS_CONT); 1065 clear_opt(sbi->s_mount_opt, ERRORS_PANIC); 1066 set_opt(sbi->s_mount_opt, ERRORS_RO); 1067 break; 1068 case Opt_err_cont: 1069 clear_opt(sbi->s_mount_opt, ERRORS_RO); 1070 clear_opt(sbi->s_mount_opt, ERRORS_PANIC); 1071 set_opt(sbi->s_mount_opt, ERRORS_CONT); 1072 break; 1073 case Opt_nouid32: 1074 set_opt(sbi->s_mount_opt, NO_UID32); 1075 break; 1076 case Opt_nocheck: 1077 clear_opt(sbi->s_mount_opt, CHECK); 1078 break; 1079 case Opt_debug: 1080 set_opt(sbi->s_mount_opt, DEBUG); 1081 break; 1082 case Opt_oldalloc: 1083 set_opt(sbi->s_mount_opt, OLDALLOC); 1084 break; 1085 case Opt_orlov: 1086 clear_opt(sbi->s_mount_opt, OLDALLOC); 1087 break; 1088 #ifdef CONFIG_EXT4_FS_XATTR 1089 case Opt_user_xattr: 1090 set_opt(sbi->s_mount_opt, XATTR_USER); 1091 break; 1092 case Opt_nouser_xattr: 1093 clear_opt(sbi->s_mount_opt, XATTR_USER); 1094 break; 1095 #else 1096 case Opt_user_xattr: 1097 case Opt_nouser_xattr: 1098 printk(KERN_ERR "EXT4 (no)user_xattr options " 1099 "not supported\n"); 1100 break; 1101 #endif 1102 #ifdef CONFIG_EXT4_FS_POSIX_ACL 1103 case Opt_acl: 1104 set_opt(sbi->s_mount_opt, POSIX_ACL); 1105 break; 1106 case Opt_noacl: 1107 clear_opt(sbi->s_mount_opt, POSIX_ACL); 1108 break; 1109 #else 1110 case Opt_acl: 1111 case Opt_noacl: 1112 printk(KERN_ERR "EXT4 (no)acl options " 1113 "not supported\n"); 1114 break; 1115 #endif 1116 case Opt_reservation: 1117 set_opt(sbi->s_mount_opt, RESERVATION); 1118 break; 1119 case Opt_noreservation: 1120 clear_opt(sbi->s_mount_opt, RESERVATION); 1121 break; 1122 case Opt_journal_update: 1123 /* @@@ FIXME */ 1124 /* Eventually we will want to be able to create 1125 a journal file here. For now, only allow the 1126 user to specify an existing inode to be the 1127 journal file. */ 1128 if (is_remount) { 1129 printk(KERN_ERR "EXT4-fs: cannot specify " 1130 "journal on remount\n"); 1131 return 0; 1132 } 1133 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL); 1134 break; 1135 case Opt_journal_inum: 1136 if (is_remount) { 1137 printk(KERN_ERR "EXT4-fs: cannot specify " 1138 "journal on remount\n"); 1139 return 0; 1140 } 1141 if (match_int(&args[0], &option)) 1142 return 0; 1143 *inum = option; 1144 break; 1145 case Opt_journal_dev: 1146 if (is_remount) { 1147 printk(KERN_ERR "EXT4-fs: cannot specify " 1148 "journal on remount\n"); 1149 return 0; 1150 } 1151 if (match_int(&args[0], &option)) 1152 return 0; 1153 *journal_devnum = option; 1154 break; 1155 case Opt_journal_checksum: 1156 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); 1157 break; 1158 case Opt_journal_async_commit: 1159 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT); 1160 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); 1161 break; 1162 case Opt_noload: 1163 set_opt(sbi->s_mount_opt, NOLOAD); 1164 break; 1165 case Opt_commit: 1166 if (match_int(&args[0], &option)) 1167 return 0; 1168 if (option < 0) 1169 return 0; 1170 if (option == 0) 1171 option = JBD2_DEFAULT_MAX_COMMIT_AGE; 1172 sbi->s_commit_interval = HZ * option; 1173 break; 1174 case Opt_data_journal: 1175 data_opt = EXT4_MOUNT_JOURNAL_DATA; 1176 goto datacheck; 1177 case Opt_data_ordered: 1178 data_opt = EXT4_MOUNT_ORDERED_DATA; 1179 goto datacheck; 1180 case Opt_data_writeback: 1181 data_opt = EXT4_MOUNT_WRITEBACK_DATA; 1182 datacheck: 1183 if (is_remount) { 1184 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS) 1185 != data_opt) { 1186 printk(KERN_ERR 1187 "EXT4-fs: cannot change data " 1188 "mode on remount\n"); 1189 return 0; 1190 } 1191 } else { 1192 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS; 1193 sbi->s_mount_opt |= data_opt; 1194 } 1195 break; 1196 case Opt_data_err_abort: 1197 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT); 1198 break; 1199 case Opt_data_err_ignore: 1200 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT); 1201 break; 1202 #ifdef CONFIG_QUOTA 1203 case Opt_usrjquota: 1204 qtype = USRQUOTA; 1205 goto set_qf_name; 1206 case Opt_grpjquota: 1207 qtype = GRPQUOTA; 1208 set_qf_name: 1209 if ((sb_any_quota_enabled(sb) || 1210 sb_any_quota_suspended(sb)) && 1211 !sbi->s_qf_names[qtype]) { 1212 printk(KERN_ERR 1213 "EXT4-fs: Cannot change journaled " 1214 "quota options when quota turned on.\n"); 1215 return 0; 1216 } 1217 qname = match_strdup(&args[0]); 1218 if (!qname) { 1219 printk(KERN_ERR 1220 "EXT4-fs: not enough memory for " 1221 "storing quotafile name.\n"); 1222 return 0; 1223 } 1224 if (sbi->s_qf_names[qtype] && 1225 strcmp(sbi->s_qf_names[qtype], qname)) { 1226 printk(KERN_ERR 1227 "EXT4-fs: %s quota file already " 1228 "specified.\n", QTYPE2NAME(qtype)); 1229 kfree(qname); 1230 return 0; 1231 } 1232 sbi->s_qf_names[qtype] = qname; 1233 if (strchr(sbi->s_qf_names[qtype], '/')) { 1234 printk(KERN_ERR 1235 "EXT4-fs: quotafile must be on " 1236 "filesystem root.\n"); 1237 kfree(sbi->s_qf_names[qtype]); 1238 sbi->s_qf_names[qtype] = NULL; 1239 return 0; 1240 } 1241 set_opt(sbi->s_mount_opt, QUOTA); 1242 break; 1243 case Opt_offusrjquota: 1244 qtype = USRQUOTA; 1245 goto clear_qf_name; 1246 case Opt_offgrpjquota: 1247 qtype = GRPQUOTA; 1248 clear_qf_name: 1249 if ((sb_any_quota_enabled(sb) || 1250 sb_any_quota_suspended(sb)) && 1251 sbi->s_qf_names[qtype]) { 1252 printk(KERN_ERR "EXT4-fs: Cannot change " 1253 "journaled quota options when " 1254 "quota turned on.\n"); 1255 return 0; 1256 } 1257 /* 1258 * The space will be released later when all options 1259 * are confirmed to be correct 1260 */ 1261 sbi->s_qf_names[qtype] = NULL; 1262 break; 1263 case Opt_jqfmt_vfsold: 1264 qfmt = QFMT_VFS_OLD; 1265 goto set_qf_format; 1266 case Opt_jqfmt_vfsv0: 1267 qfmt = QFMT_VFS_V0; 1268 set_qf_format: 1269 if ((sb_any_quota_enabled(sb) || 1270 sb_any_quota_suspended(sb)) && 1271 sbi->s_jquota_fmt != qfmt) { 1272 printk(KERN_ERR "EXT4-fs: Cannot change " 1273 "journaled quota options when " 1274 "quota turned on.\n"); 1275 return 0; 1276 } 1277 sbi->s_jquota_fmt = qfmt; 1278 break; 1279 case Opt_quota: 1280 case Opt_usrquota: 1281 set_opt(sbi->s_mount_opt, QUOTA); 1282 set_opt(sbi->s_mount_opt, USRQUOTA); 1283 break; 1284 case Opt_grpquota: 1285 set_opt(sbi->s_mount_opt, QUOTA); 1286 set_opt(sbi->s_mount_opt, GRPQUOTA); 1287 break; 1288 case Opt_noquota: 1289 if (sb_any_quota_enabled(sb)) { 1290 printk(KERN_ERR "EXT4-fs: Cannot change quota " 1291 "options when quota turned on.\n"); 1292 return 0; 1293 } 1294 clear_opt(sbi->s_mount_opt, QUOTA); 1295 clear_opt(sbi->s_mount_opt, USRQUOTA); 1296 clear_opt(sbi->s_mount_opt, GRPQUOTA); 1297 break; 1298 #else 1299 case Opt_quota: 1300 case Opt_usrquota: 1301 case Opt_grpquota: 1302 printk(KERN_ERR 1303 "EXT4-fs: quota options not supported.\n"); 1304 break; 1305 case Opt_usrjquota: 1306 case Opt_grpjquota: 1307 case Opt_offusrjquota: 1308 case Opt_offgrpjquota: 1309 case Opt_jqfmt_vfsold: 1310 case Opt_jqfmt_vfsv0: 1311 printk(KERN_ERR 1312 "EXT4-fs: journaled quota options not " 1313 "supported.\n"); 1314 break; 1315 case Opt_noquota: 1316 break; 1317 #endif 1318 case Opt_abort: 1319 set_opt(sbi->s_mount_opt, ABORT); 1320 break; 1321 case Opt_barrier: 1322 if (match_int(&args[0], &option)) 1323 return 0; 1324 if (option) 1325 set_opt(sbi->s_mount_opt, BARRIER); 1326 else 1327 clear_opt(sbi->s_mount_opt, BARRIER); 1328 break; 1329 case Opt_ignore: 1330 break; 1331 case Opt_resize: 1332 if (!is_remount) { 1333 printk("EXT4-fs: resize option only available " 1334 "for remount\n"); 1335 return 0; 1336 } 1337 if (match_int(&args[0], &option) != 0) 1338 return 0; 1339 *n_blocks_count = option; 1340 break; 1341 case Opt_nobh: 1342 set_opt(sbi->s_mount_opt, NOBH); 1343 break; 1344 case Opt_bh: 1345 clear_opt(sbi->s_mount_opt, NOBH); 1346 break; 1347 case Opt_extents: 1348 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, 1349 EXT4_FEATURE_INCOMPAT_EXTENTS)) { 1350 ext4_warning(sb, __func__, 1351 "extents feature not enabled " 1352 "on this filesystem, use tune2fs\n"); 1353 return 0; 1354 } 1355 set_opt(sbi->s_mount_opt, EXTENTS); 1356 break; 1357 case Opt_noextents: 1358 /* 1359 * When e2fsprogs support resizing an already existing 1360 * ext3 file system to greater than 2**32 we need to 1361 * add support to block allocator to handle growing 1362 * already existing block mapped inode so that blocks 1363 * allocated for them fall within 2**32 1364 */ 1365 last_block = ext4_blocks_count(sbi->s_es) - 1; 1366 if (last_block > 0xffffffffULL) { 1367 printk(KERN_ERR "EXT4-fs: Filesystem too " 1368 "large to mount with " 1369 "-o noextents options\n"); 1370 return 0; 1371 } 1372 clear_opt(sbi->s_mount_opt, EXTENTS); 1373 break; 1374 case Opt_i_version: 1375 set_opt(sbi->s_mount_opt, I_VERSION); 1376 sb->s_flags |= MS_I_VERSION; 1377 break; 1378 case Opt_nodelalloc: 1379 clear_opt(sbi->s_mount_opt, DELALLOC); 1380 break; 1381 case Opt_stripe: 1382 if (match_int(&args[0], &option)) 1383 return 0; 1384 if (option < 0) 1385 return 0; 1386 sbi->s_stripe = option; 1387 break; 1388 case Opt_delalloc: 1389 set_opt(sbi->s_mount_opt, DELALLOC); 1390 break; 1391 case Opt_inode_readahead_blks: 1392 if (match_int(&args[0], &option)) 1393 return 0; 1394 if (option < 0 || option > (1 << 30)) 1395 return 0; 1396 sbi->s_inode_readahead_blks = option; 1397 break; 1398 default: 1399 printk(KERN_ERR 1400 "EXT4-fs: Unrecognized mount option \"%s\" " 1401 "or missing value\n", p); 1402 return 0; 1403 } 1404 } 1405 #ifdef CONFIG_QUOTA 1406 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { 1407 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) && 1408 sbi->s_qf_names[USRQUOTA]) 1409 clear_opt(sbi->s_mount_opt, USRQUOTA); 1410 1411 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) && 1412 sbi->s_qf_names[GRPQUOTA]) 1413 clear_opt(sbi->s_mount_opt, GRPQUOTA); 1414 1415 if ((sbi->s_qf_names[USRQUOTA] && 1416 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) || 1417 (sbi->s_qf_names[GRPQUOTA] && 1418 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) { 1419 printk(KERN_ERR "EXT4-fs: old and new quota " 1420 "format mixing.\n"); 1421 return 0; 1422 } 1423 1424 if (!sbi->s_jquota_fmt) { 1425 printk(KERN_ERR "EXT4-fs: journaled quota format " 1426 "not specified.\n"); 1427 return 0; 1428 } 1429 } else { 1430 if (sbi->s_jquota_fmt) { 1431 printk(KERN_ERR "EXT4-fs: journaled quota format " 1432 "specified with no journaling " 1433 "enabled.\n"); 1434 return 0; 1435 } 1436 } 1437 #endif 1438 return 1; 1439 } 1440 1441 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, 1442 int read_only) 1443 { 1444 struct ext4_sb_info *sbi = EXT4_SB(sb); 1445 int res = 0; 1446 1447 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { 1448 printk(KERN_ERR "EXT4-fs warning: revision level too high, " 1449 "forcing read-only mode\n"); 1450 res = MS_RDONLY; 1451 } 1452 if (read_only) 1453 return res; 1454 if (!(sbi->s_mount_state & EXT4_VALID_FS)) 1455 printk(KERN_WARNING "EXT4-fs warning: mounting unchecked fs, " 1456 "running e2fsck is recommended\n"); 1457 else if ((sbi->s_mount_state & EXT4_ERROR_FS)) 1458 printk(KERN_WARNING 1459 "EXT4-fs warning: mounting fs with errors, " 1460 "running e2fsck is recommended\n"); 1461 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 1462 le16_to_cpu(es->s_mnt_count) >= 1463 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 1464 printk(KERN_WARNING 1465 "EXT4-fs warning: maximal mount count reached, " 1466 "running e2fsck is recommended\n"); 1467 else if (le32_to_cpu(es->s_checkinterval) && 1468 (le32_to_cpu(es->s_lastcheck) + 1469 le32_to_cpu(es->s_checkinterval) <= get_seconds())) 1470 printk(KERN_WARNING 1471 "EXT4-fs warning: checktime reached, " 1472 "running e2fsck is recommended\n"); 1473 #if 0 1474 /* @@@ We _will_ want to clear the valid bit if we find 1475 * inconsistencies, to force a fsck at reboot. But for 1476 * a plain journaled filesystem we can keep it set as 1477 * valid forever! :) 1478 */ 1479 es->s_state &= cpu_to_le16(~EXT4_VALID_FS); 1480 #endif 1481 if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) 1482 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); 1483 le16_add_cpu(&es->s_mnt_count, 1); 1484 es->s_mtime = cpu_to_le32(get_seconds()); 1485 ext4_update_dynamic_rev(sb); 1486 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 1487 1488 ext4_commit_super(sb, es, 1); 1489 if (test_opt(sb, DEBUG)) 1490 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, " 1491 "bpg=%lu, ipg=%lu, mo=%04lx]\n", 1492 sb->s_blocksize, 1493 sbi->s_groups_count, 1494 EXT4_BLOCKS_PER_GROUP(sb), 1495 EXT4_INODES_PER_GROUP(sb), 1496 sbi->s_mount_opt); 1497 1498 printk(KERN_INFO "EXT4 FS on %s, %s journal on %s\n", 1499 sb->s_id, EXT4_SB(sb)->s_journal->j_inode ? "internal" : 1500 "external", EXT4_SB(sb)->s_journal->j_devname); 1501 return res; 1502 } 1503 1504 static int ext4_fill_flex_info(struct super_block *sb) 1505 { 1506 struct ext4_sb_info *sbi = EXT4_SB(sb); 1507 struct ext4_group_desc *gdp = NULL; 1508 struct buffer_head *bh; 1509 ext4_group_t flex_group_count; 1510 ext4_group_t flex_group; 1511 int groups_per_flex = 0; 1512 __u64 block_bitmap = 0; 1513 int i; 1514 1515 if (!sbi->s_es->s_log_groups_per_flex) { 1516 sbi->s_log_groups_per_flex = 0; 1517 return 1; 1518 } 1519 1520 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex; 1521 groups_per_flex = 1 << sbi->s_log_groups_per_flex; 1522 1523 /* We allocate both existing and potentially added groups */ 1524 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) + 1525 ((sbi->s_es->s_reserved_gdt_blocks +1 ) << 1526 EXT4_DESC_PER_BLOCK_BITS(sb))) / 1527 groups_per_flex; 1528 sbi->s_flex_groups = kzalloc(flex_group_count * 1529 sizeof(struct flex_groups), GFP_KERNEL); 1530 if (sbi->s_flex_groups == NULL) { 1531 printk(KERN_ERR "EXT4-fs: not enough memory for " 1532 "%lu flex groups\n", flex_group_count); 1533 goto failed; 1534 } 1535 1536 gdp = ext4_get_group_desc(sb, 1, &bh); 1537 block_bitmap = ext4_block_bitmap(sb, gdp) - 1; 1538 1539 for (i = 0; i < sbi->s_groups_count; i++) { 1540 gdp = ext4_get_group_desc(sb, i, &bh); 1541 1542 flex_group = ext4_flex_group(sbi, i); 1543 sbi->s_flex_groups[flex_group].free_inodes += 1544 le16_to_cpu(gdp->bg_free_inodes_count); 1545 sbi->s_flex_groups[flex_group].free_blocks += 1546 le16_to_cpu(gdp->bg_free_blocks_count); 1547 } 1548 1549 return 1; 1550 failed: 1551 return 0; 1552 } 1553 1554 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group, 1555 struct ext4_group_desc *gdp) 1556 { 1557 __u16 crc = 0; 1558 1559 if (sbi->s_es->s_feature_ro_compat & 1560 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { 1561 int offset = offsetof(struct ext4_group_desc, bg_checksum); 1562 __le32 le_group = cpu_to_le32(block_group); 1563 1564 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); 1565 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); 1566 crc = crc16(crc, (__u8 *)gdp, offset); 1567 offset += sizeof(gdp->bg_checksum); /* skip checksum */ 1568 /* for checksum of struct ext4_group_desc do the rest...*/ 1569 if ((sbi->s_es->s_feature_incompat & 1570 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) && 1571 offset < le16_to_cpu(sbi->s_es->s_desc_size)) 1572 crc = crc16(crc, (__u8 *)gdp + offset, 1573 le16_to_cpu(sbi->s_es->s_desc_size) - 1574 offset); 1575 } 1576 1577 return cpu_to_le16(crc); 1578 } 1579 1580 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group, 1581 struct ext4_group_desc *gdp) 1582 { 1583 if ((sbi->s_es->s_feature_ro_compat & 1584 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) && 1585 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp))) 1586 return 0; 1587 1588 return 1; 1589 } 1590 1591 /* Called at mount-time, super-block is locked */ 1592 static int ext4_check_descriptors(struct super_block *sb) 1593 { 1594 struct ext4_sb_info *sbi = EXT4_SB(sb); 1595 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); 1596 ext4_fsblk_t last_block; 1597 ext4_fsblk_t block_bitmap; 1598 ext4_fsblk_t inode_bitmap; 1599 ext4_fsblk_t inode_table; 1600 int flexbg_flag = 0; 1601 ext4_group_t i; 1602 1603 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 1604 flexbg_flag = 1; 1605 1606 ext4_debug("Checking group descriptors"); 1607 1608 for (i = 0; i < sbi->s_groups_count; i++) { 1609 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); 1610 1611 if (i == sbi->s_groups_count - 1 || flexbg_flag) 1612 last_block = ext4_blocks_count(sbi->s_es) - 1; 1613 else 1614 last_block = first_block + 1615 (EXT4_BLOCKS_PER_GROUP(sb) - 1); 1616 1617 block_bitmap = ext4_block_bitmap(sb, gdp); 1618 if (block_bitmap < first_block || block_bitmap > last_block) { 1619 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " 1620 "Block bitmap for group %lu not in group " 1621 "(block %llu)!", i, block_bitmap); 1622 return 0; 1623 } 1624 inode_bitmap = ext4_inode_bitmap(sb, gdp); 1625 if (inode_bitmap < first_block || inode_bitmap > last_block) { 1626 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " 1627 "Inode bitmap for group %lu not in group " 1628 "(block %llu)!", i, inode_bitmap); 1629 return 0; 1630 } 1631 inode_table = ext4_inode_table(sb, gdp); 1632 if (inode_table < first_block || 1633 inode_table + sbi->s_itb_per_group - 1 > last_block) { 1634 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " 1635 "Inode table for group %lu not in group " 1636 "(block %llu)!", i, inode_table); 1637 return 0; 1638 } 1639 spin_lock(sb_bgl_lock(sbi, i)); 1640 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) { 1641 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " 1642 "Checksum for group %lu failed (%u!=%u)\n", 1643 i, le16_to_cpu(ext4_group_desc_csum(sbi, i, 1644 gdp)), le16_to_cpu(gdp->bg_checksum)); 1645 if (!(sb->s_flags & MS_RDONLY)) { 1646 spin_unlock(sb_bgl_lock(sbi, i)); 1647 return 0; 1648 } 1649 } 1650 spin_unlock(sb_bgl_lock(sbi, i)); 1651 if (!flexbg_flag) 1652 first_block += EXT4_BLOCKS_PER_GROUP(sb); 1653 } 1654 1655 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb)); 1656 sbi->s_es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb)); 1657 return 1; 1658 } 1659 1660 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at 1661 * the superblock) which were deleted from all directories, but held open by 1662 * a process at the time of a crash. We walk the list and try to delete these 1663 * inodes at recovery time (only with a read-write filesystem). 1664 * 1665 * In order to keep the orphan inode chain consistent during traversal (in 1666 * case of crash during recovery), we link each inode into the superblock 1667 * orphan list_head and handle it the same way as an inode deletion during 1668 * normal operation (which journals the operations for us). 1669 * 1670 * We only do an iget() and an iput() on each inode, which is very safe if we 1671 * accidentally point at an in-use or already deleted inode. The worst that 1672 * can happen in this case is that we get a "bit already cleared" message from 1673 * ext4_free_inode(). The only reason we would point at a wrong inode is if 1674 * e2fsck was run on this filesystem, and it must have already done the orphan 1675 * inode cleanup for us, so we can safely abort without any further action. 1676 */ 1677 static void ext4_orphan_cleanup(struct super_block *sb, 1678 struct ext4_super_block *es) 1679 { 1680 unsigned int s_flags = sb->s_flags; 1681 int nr_orphans = 0, nr_truncates = 0; 1682 #ifdef CONFIG_QUOTA 1683 int i; 1684 #endif 1685 if (!es->s_last_orphan) { 1686 jbd_debug(4, "no orphan inodes to clean up\n"); 1687 return; 1688 } 1689 1690 if (bdev_read_only(sb->s_bdev)) { 1691 printk(KERN_ERR "EXT4-fs: write access " 1692 "unavailable, skipping orphan cleanup.\n"); 1693 return; 1694 } 1695 1696 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { 1697 if (es->s_last_orphan) 1698 jbd_debug(1, "Errors on filesystem, " 1699 "clearing orphan list.\n"); 1700 es->s_last_orphan = 0; 1701 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); 1702 return; 1703 } 1704 1705 if (s_flags & MS_RDONLY) { 1706 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n", 1707 sb->s_id); 1708 sb->s_flags &= ~MS_RDONLY; 1709 } 1710 #ifdef CONFIG_QUOTA 1711 /* Needed for iput() to work correctly and not trash data */ 1712 sb->s_flags |= MS_ACTIVE; 1713 /* Turn on quotas so that they are updated correctly */ 1714 for (i = 0; i < MAXQUOTAS; i++) { 1715 if (EXT4_SB(sb)->s_qf_names[i]) { 1716 int ret = ext4_quota_on_mount(sb, i); 1717 if (ret < 0) 1718 printk(KERN_ERR 1719 "EXT4-fs: Cannot turn on journaled " 1720 "quota: error %d\n", ret); 1721 } 1722 } 1723 #endif 1724 1725 while (es->s_last_orphan) { 1726 struct inode *inode; 1727 1728 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); 1729 if (IS_ERR(inode)) { 1730 es->s_last_orphan = 0; 1731 break; 1732 } 1733 1734 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); 1735 DQUOT_INIT(inode); 1736 if (inode->i_nlink) { 1737 printk(KERN_DEBUG 1738 "%s: truncating inode %lu to %lld bytes\n", 1739 __func__, inode->i_ino, inode->i_size); 1740 jbd_debug(2, "truncating inode %lu to %lld bytes\n", 1741 inode->i_ino, inode->i_size); 1742 ext4_truncate(inode); 1743 nr_truncates++; 1744 } else { 1745 printk(KERN_DEBUG 1746 "%s: deleting unreferenced inode %lu\n", 1747 __func__, inode->i_ino); 1748 jbd_debug(2, "deleting unreferenced inode %lu\n", 1749 inode->i_ino); 1750 nr_orphans++; 1751 } 1752 iput(inode); /* The delete magic happens here! */ 1753 } 1754 1755 #define PLURAL(x) (x), ((x) == 1) ? "" : "s" 1756 1757 if (nr_orphans) 1758 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n", 1759 sb->s_id, PLURAL(nr_orphans)); 1760 if (nr_truncates) 1761 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n", 1762 sb->s_id, PLURAL(nr_truncates)); 1763 #ifdef CONFIG_QUOTA 1764 /* Turn quotas off */ 1765 for (i = 0; i < MAXQUOTAS; i++) { 1766 if (sb_dqopt(sb)->files[i]) 1767 vfs_quota_off(sb, i, 0); 1768 } 1769 #endif 1770 sb->s_flags = s_flags; /* Restore MS_RDONLY status */ 1771 } 1772 /* 1773 * Maximal extent format file size. 1774 * Resulting logical blkno at s_maxbytes must fit in our on-disk 1775 * extent format containers, within a sector_t, and within i_blocks 1776 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, 1777 * so that won't be a limiting factor. 1778 * 1779 * Note, this does *not* consider any metadata overhead for vfs i_blocks. 1780 */ 1781 static loff_t ext4_max_size(int blkbits) 1782 { 1783 loff_t res; 1784 loff_t upper_limit = MAX_LFS_FILESIZE; 1785 1786 /* small i_blocks in vfs inode? */ 1787 if (sizeof(blkcnt_t) < sizeof(u64)) { 1788 /* 1789 * CONFIG_LSF is not enabled implies the inode 1790 * i_block represent total blocks in 512 bytes 1791 * 32 == size of vfs inode i_blocks * 8 1792 */ 1793 upper_limit = (1LL << 32) - 1; 1794 1795 /* total blocks in file system block size */ 1796 upper_limit >>= (blkbits - 9); 1797 upper_limit <<= blkbits; 1798 } 1799 1800 /* 32-bit extent-start container, ee_block */ 1801 res = 1LL << 32; 1802 res <<= blkbits; 1803 res -= 1; 1804 1805 /* Sanity check against vm- & vfs- imposed limits */ 1806 if (res > upper_limit) 1807 res = upper_limit; 1808 1809 return res; 1810 } 1811 1812 /* 1813 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect 1814 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. 1815 * We need to be 1 filesystem block less than the 2^48 sector limit. 1816 */ 1817 static loff_t ext4_max_bitmap_size(int bits) 1818 { 1819 loff_t res = EXT4_NDIR_BLOCKS; 1820 int meta_blocks; 1821 loff_t upper_limit; 1822 /* This is calculated to be the largest file size for a 1823 * dense, bitmapped file such that the total number of 1824 * sectors in the file, including data and all indirect blocks, 1825 * does not exceed 2^48 -1 1826 * __u32 i_blocks_lo and _u16 i_blocks_high representing the 1827 * total number of 512 bytes blocks of the file 1828 */ 1829 1830 if (sizeof(blkcnt_t) < sizeof(u64)) { 1831 /* 1832 * CONFIG_LSF is not enabled implies the inode 1833 * i_block represent total blocks in 512 bytes 1834 * 32 == size of vfs inode i_blocks * 8 1835 */ 1836 upper_limit = (1LL << 32) - 1; 1837 1838 /* total blocks in file system block size */ 1839 upper_limit >>= (bits - 9); 1840 1841 } else { 1842 /* 1843 * We use 48 bit ext4_inode i_blocks 1844 * With EXT4_HUGE_FILE_FL set the i_blocks 1845 * represent total number of blocks in 1846 * file system block size 1847 */ 1848 upper_limit = (1LL << 48) - 1; 1849 1850 } 1851 1852 /* indirect blocks */ 1853 meta_blocks = 1; 1854 /* double indirect blocks */ 1855 meta_blocks += 1 + (1LL << (bits-2)); 1856 /* tripple indirect blocks */ 1857 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); 1858 1859 upper_limit -= meta_blocks; 1860 upper_limit <<= bits; 1861 1862 res += 1LL << (bits-2); 1863 res += 1LL << (2*(bits-2)); 1864 res += 1LL << (3*(bits-2)); 1865 res <<= bits; 1866 if (res > upper_limit) 1867 res = upper_limit; 1868 1869 if (res > MAX_LFS_FILESIZE) 1870 res = MAX_LFS_FILESIZE; 1871 1872 return res; 1873 } 1874 1875 static ext4_fsblk_t descriptor_loc(struct super_block *sb, 1876 ext4_fsblk_t logical_sb_block, int nr) 1877 { 1878 struct ext4_sb_info *sbi = EXT4_SB(sb); 1879 ext4_group_t bg, first_meta_bg; 1880 int has_super = 0; 1881 1882 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 1883 1884 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || 1885 nr < first_meta_bg) 1886 return logical_sb_block + nr + 1; 1887 bg = sbi->s_desc_per_block * nr; 1888 if (ext4_bg_has_super(sb, bg)) 1889 has_super = 1; 1890 return (has_super + ext4_group_first_block_no(sb, bg)); 1891 } 1892 1893 /** 1894 * ext4_get_stripe_size: Get the stripe size. 1895 * @sbi: In memory super block info 1896 * 1897 * If we have specified it via mount option, then 1898 * use the mount option value. If the value specified at mount time is 1899 * greater than the blocks per group use the super block value. 1900 * If the super block value is greater than blocks per group return 0. 1901 * Allocator needs it be less than blocks per group. 1902 * 1903 */ 1904 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) 1905 { 1906 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); 1907 unsigned long stripe_width = 1908 le32_to_cpu(sbi->s_es->s_raid_stripe_width); 1909 1910 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) 1911 return sbi->s_stripe; 1912 1913 if (stripe_width <= sbi->s_blocks_per_group) 1914 return stripe_width; 1915 1916 if (stride <= sbi->s_blocks_per_group) 1917 return stride; 1918 1919 return 0; 1920 } 1921 1922 static int ext4_fill_super(struct super_block *sb, void *data, int silent) 1923 __releases(kernel_lock) 1924 __acquires(kernel_lock) 1925 1926 { 1927 struct buffer_head *bh; 1928 struct ext4_super_block *es = NULL; 1929 struct ext4_sb_info *sbi; 1930 ext4_fsblk_t block; 1931 ext4_fsblk_t sb_block = get_sb_block(&data); 1932 ext4_fsblk_t logical_sb_block; 1933 unsigned long offset = 0; 1934 unsigned int journal_inum = 0; 1935 unsigned long journal_devnum = 0; 1936 unsigned long def_mount_opts; 1937 struct inode *root; 1938 char *cp; 1939 int ret = -EINVAL; 1940 int blocksize; 1941 int db_count; 1942 int i; 1943 int needs_recovery; 1944 __le32 features; 1945 __u64 blocks_count; 1946 int err; 1947 1948 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 1949 if (!sbi) 1950 return -ENOMEM; 1951 sb->s_fs_info = sbi; 1952 sbi->s_mount_opt = 0; 1953 sbi->s_resuid = EXT4_DEF_RESUID; 1954 sbi->s_resgid = EXT4_DEF_RESGID; 1955 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS; 1956 sbi->s_sb_block = sb_block; 1957 1958 unlock_kernel(); 1959 1960 /* Cleanup superblock name */ 1961 for (cp = sb->s_id; (cp = strchr(cp, '/'));) 1962 *cp = '!'; 1963 1964 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); 1965 if (!blocksize) { 1966 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n"); 1967 goto out_fail; 1968 } 1969 1970 /* 1971 * The ext4 superblock will not be buffer aligned for other than 1kB 1972 * block sizes. We need to calculate the offset from buffer start. 1973 */ 1974 if (blocksize != EXT4_MIN_BLOCK_SIZE) { 1975 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 1976 offset = do_div(logical_sb_block, blocksize); 1977 } else { 1978 logical_sb_block = sb_block; 1979 } 1980 1981 if (!(bh = sb_bread(sb, logical_sb_block))) { 1982 printk(KERN_ERR "EXT4-fs: unable to read superblock\n"); 1983 goto out_fail; 1984 } 1985 /* 1986 * Note: s_es must be initialized as soon as possible because 1987 * some ext4 macro-instructions depend on its value 1988 */ 1989 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 1990 sbi->s_es = es; 1991 sb->s_magic = le16_to_cpu(es->s_magic); 1992 if (sb->s_magic != EXT4_SUPER_MAGIC) 1993 goto cantfind_ext4; 1994 1995 /* Set defaults before we parse the mount options */ 1996 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 1997 if (def_mount_opts & EXT4_DEFM_DEBUG) 1998 set_opt(sbi->s_mount_opt, DEBUG); 1999 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) 2000 set_opt(sbi->s_mount_opt, GRPID); 2001 if (def_mount_opts & EXT4_DEFM_UID16) 2002 set_opt(sbi->s_mount_opt, NO_UID32); 2003 #ifdef CONFIG_EXT4_FS_XATTR 2004 if (def_mount_opts & EXT4_DEFM_XATTR_USER) 2005 set_opt(sbi->s_mount_opt, XATTR_USER); 2006 #endif 2007 #ifdef CONFIG_EXT4_FS_POSIX_ACL 2008 if (def_mount_opts & EXT4_DEFM_ACL) 2009 set_opt(sbi->s_mount_opt, POSIX_ACL); 2010 #endif 2011 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) 2012 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA; 2013 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) 2014 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA; 2015 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) 2016 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA; 2017 2018 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) 2019 set_opt(sbi->s_mount_opt, ERRORS_PANIC); 2020 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE) 2021 set_opt(sbi->s_mount_opt, ERRORS_CONT); 2022 else 2023 set_opt(sbi->s_mount_opt, ERRORS_RO); 2024 2025 sbi->s_resuid = le16_to_cpu(es->s_def_resuid); 2026 sbi->s_resgid = le16_to_cpu(es->s_def_resgid); 2027 2028 set_opt(sbi->s_mount_opt, RESERVATION); 2029 set_opt(sbi->s_mount_opt, BARRIER); 2030 2031 /* 2032 * turn on extents feature by default in ext4 filesystem 2033 * only if feature flag already set by mkfs or tune2fs. 2034 * Use -o noextents to turn it off 2035 */ 2036 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) 2037 set_opt(sbi->s_mount_opt, EXTENTS); 2038 else 2039 ext4_warning(sb, __func__, 2040 "extents feature not enabled on this filesystem, " 2041 "use tune2fs.\n"); 2042 2043 /* 2044 * enable delayed allocation by default 2045 * Use -o nodelalloc to turn it off 2046 */ 2047 set_opt(sbi->s_mount_opt, DELALLOC); 2048 2049 2050 if (!parse_options((char *) data, sb, &journal_inum, &journal_devnum, 2051 NULL, 0)) 2052 goto failed_mount; 2053 2054 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 2055 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 2056 2057 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && 2058 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || 2059 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 2060 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) 2061 printk(KERN_WARNING 2062 "EXT4-fs warning: feature flags set on rev 0 fs, " 2063 "running e2fsck is recommended\n"); 2064 2065 /* 2066 * Check feature flags regardless of the revision level, since we 2067 * previously didn't change the revision level when setting the flags, 2068 * so there is a chance incompat flags are set on a rev 0 filesystem. 2069 */ 2070 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP); 2071 if (features) { 2072 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of " 2073 "unsupported optional features (%x).\n", 2074 sb->s_id, le32_to_cpu(features)); 2075 goto failed_mount; 2076 } 2077 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP); 2078 if (!(sb->s_flags & MS_RDONLY) && features) { 2079 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of " 2080 "unsupported optional features (%x).\n", 2081 sb->s_id, le32_to_cpu(features)); 2082 goto failed_mount; 2083 } 2084 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) { 2085 /* 2086 * Large file size enabled file system can only be 2087 * mount if kernel is build with CONFIG_LSF 2088 */ 2089 if (sizeof(root->i_blocks) < sizeof(u64) && 2090 !(sb->s_flags & MS_RDONLY)) { 2091 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge " 2092 "files cannot be mounted read-write " 2093 "without CONFIG_LSF.\n", sb->s_id); 2094 goto failed_mount; 2095 } 2096 } 2097 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); 2098 2099 if (blocksize < EXT4_MIN_BLOCK_SIZE || 2100 blocksize > EXT4_MAX_BLOCK_SIZE) { 2101 printk(KERN_ERR 2102 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n", 2103 blocksize, sb->s_id); 2104 goto failed_mount; 2105 } 2106 2107 if (sb->s_blocksize != blocksize) { 2108 2109 /* Validate the filesystem blocksize */ 2110 if (!sb_set_blocksize(sb, blocksize)) { 2111 printk(KERN_ERR "EXT4-fs: bad block size %d.\n", 2112 blocksize); 2113 goto failed_mount; 2114 } 2115 2116 brelse(bh); 2117 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 2118 offset = do_div(logical_sb_block, blocksize); 2119 bh = sb_bread(sb, logical_sb_block); 2120 if (!bh) { 2121 printk(KERN_ERR 2122 "EXT4-fs: Can't read superblock on 2nd try.\n"); 2123 goto failed_mount; 2124 } 2125 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); 2126 sbi->s_es = es; 2127 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { 2128 printk(KERN_ERR 2129 "EXT4-fs: Magic mismatch, very weird !\n"); 2130 goto failed_mount; 2131 } 2132 } 2133 2134 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits); 2135 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits); 2136 2137 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { 2138 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; 2139 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; 2140 } else { 2141 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 2142 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 2143 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || 2144 (!is_power_of_2(sbi->s_inode_size)) || 2145 (sbi->s_inode_size > blocksize)) { 2146 printk(KERN_ERR 2147 "EXT4-fs: unsupported inode size: %d\n", 2148 sbi->s_inode_size); 2149 goto failed_mount; 2150 } 2151 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) 2152 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); 2153 } 2154 sbi->s_desc_size = le16_to_cpu(es->s_desc_size); 2155 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { 2156 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || 2157 sbi->s_desc_size > EXT4_MAX_DESC_SIZE || 2158 !is_power_of_2(sbi->s_desc_size)) { 2159 printk(KERN_ERR 2160 "EXT4-fs: unsupported descriptor size %lu\n", 2161 sbi->s_desc_size); 2162 goto failed_mount; 2163 } 2164 } else 2165 sbi->s_desc_size = EXT4_MIN_DESC_SIZE; 2166 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 2167 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 2168 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0) 2169 goto cantfind_ext4; 2170 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); 2171 if (sbi->s_inodes_per_block == 0) 2172 goto cantfind_ext4; 2173 sbi->s_itb_per_group = sbi->s_inodes_per_group / 2174 sbi->s_inodes_per_block; 2175 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); 2176 sbi->s_sbh = bh; 2177 sbi->s_mount_state = le16_to_cpu(es->s_state); 2178 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); 2179 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); 2180 for (i = 0; i < 4; i++) 2181 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); 2182 sbi->s_def_hash_version = es->s_def_hash_version; 2183 2184 if (sbi->s_blocks_per_group > blocksize * 8) { 2185 printk(KERN_ERR 2186 "EXT4-fs: #blocks per group too big: %lu\n", 2187 sbi->s_blocks_per_group); 2188 goto failed_mount; 2189 } 2190 if (sbi->s_inodes_per_group > blocksize * 8) { 2191 printk(KERN_ERR 2192 "EXT4-fs: #inodes per group too big: %lu\n", 2193 sbi->s_inodes_per_group); 2194 goto failed_mount; 2195 } 2196 2197 if (ext4_blocks_count(es) > 2198 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { 2199 printk(KERN_ERR "EXT4-fs: filesystem on %s:" 2200 " too large to mount safely\n", sb->s_id); 2201 if (sizeof(sector_t) < 8) 2202 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not " 2203 "enabled\n"); 2204 goto failed_mount; 2205 } 2206 2207 if (EXT4_BLOCKS_PER_GROUP(sb) == 0) 2208 goto cantfind_ext4; 2209 2210 /* ensure blocks_count calculation below doesn't sign-extend */ 2211 if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) < 2212 le32_to_cpu(es->s_first_data_block) + 1) { 2213 printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, " 2214 "first data block %u, blocks per group %lu\n", 2215 ext4_blocks_count(es), 2216 le32_to_cpu(es->s_first_data_block), 2217 EXT4_BLOCKS_PER_GROUP(sb)); 2218 goto failed_mount; 2219 } 2220 blocks_count = (ext4_blocks_count(es) - 2221 le32_to_cpu(es->s_first_data_block) + 2222 EXT4_BLOCKS_PER_GROUP(sb) - 1); 2223 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); 2224 sbi->s_groups_count = blocks_count; 2225 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / 2226 EXT4_DESC_PER_BLOCK(sb); 2227 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *), 2228 GFP_KERNEL); 2229 if (sbi->s_group_desc == NULL) { 2230 printk(KERN_ERR "EXT4-fs: not enough memory\n"); 2231 goto failed_mount; 2232 } 2233 2234 #ifdef CONFIG_PROC_FS 2235 if (ext4_proc_root) 2236 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); 2237 2238 if (sbi->s_proc) 2239 proc_create_data("inode_readahead_blks", 0644, sbi->s_proc, 2240 &ext4_ui_proc_fops, 2241 &sbi->s_inode_readahead_blks); 2242 #endif 2243 2244 bgl_lock_init(&sbi->s_blockgroup_lock); 2245 2246 for (i = 0; i < db_count; i++) { 2247 block = descriptor_loc(sb, logical_sb_block, i); 2248 sbi->s_group_desc[i] = sb_bread(sb, block); 2249 if (!sbi->s_group_desc[i]) { 2250 printk(KERN_ERR "EXT4-fs: " 2251 "can't read group descriptor %d\n", i); 2252 db_count = i; 2253 goto failed_mount2; 2254 } 2255 } 2256 if (!ext4_check_descriptors(sb)) { 2257 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n"); 2258 goto failed_mount2; 2259 } 2260 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 2261 if (!ext4_fill_flex_info(sb)) { 2262 printk(KERN_ERR 2263 "EXT4-fs: unable to initialize " 2264 "flex_bg meta info!\n"); 2265 goto failed_mount2; 2266 } 2267 2268 sbi->s_gdb_count = db_count; 2269 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 2270 spin_lock_init(&sbi->s_next_gen_lock); 2271 2272 err = percpu_counter_init(&sbi->s_freeblocks_counter, 2273 ext4_count_free_blocks(sb)); 2274 if (!err) { 2275 err = percpu_counter_init(&sbi->s_freeinodes_counter, 2276 ext4_count_free_inodes(sb)); 2277 } 2278 if (!err) { 2279 err = percpu_counter_init(&sbi->s_dirs_counter, 2280 ext4_count_dirs(sb)); 2281 } 2282 if (!err) { 2283 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0); 2284 } 2285 if (err) { 2286 printk(KERN_ERR "EXT4-fs: insufficient memory\n"); 2287 goto failed_mount3; 2288 } 2289 2290 sbi->s_stripe = ext4_get_stripe_size(sbi); 2291 2292 /* 2293 * set up enough so that it can read an inode 2294 */ 2295 sb->s_op = &ext4_sops; 2296 sb->s_export_op = &ext4_export_ops; 2297 sb->s_xattr = ext4_xattr_handlers; 2298 #ifdef CONFIG_QUOTA 2299 sb->s_qcop = &ext4_qctl_operations; 2300 sb->dq_op = &ext4_quota_operations; 2301 #endif 2302 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ 2303 2304 sb->s_root = NULL; 2305 2306 needs_recovery = (es->s_last_orphan != 0 || 2307 EXT4_HAS_INCOMPAT_FEATURE(sb, 2308 EXT4_FEATURE_INCOMPAT_RECOVER)); 2309 2310 /* 2311 * The first inode we look at is the journal inode. Don't try 2312 * root first: it may be modified in the journal! 2313 */ 2314 if (!test_opt(sb, NOLOAD) && 2315 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 2316 if (ext4_load_journal(sb, es, journal_devnum)) 2317 goto failed_mount3; 2318 if (!(sb->s_flags & MS_RDONLY) && 2319 EXT4_SB(sb)->s_journal->j_failed_commit) { 2320 printk(KERN_CRIT "EXT4-fs error (device %s): " 2321 "ext4_fill_super: Journal transaction " 2322 "%u is corrupt\n", sb->s_id, 2323 EXT4_SB(sb)->s_journal->j_failed_commit); 2324 if (test_opt(sb, ERRORS_RO)) { 2325 printk(KERN_CRIT 2326 "Mounting filesystem read-only\n"); 2327 sb->s_flags |= MS_RDONLY; 2328 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 2329 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 2330 } 2331 if (test_opt(sb, ERRORS_PANIC)) { 2332 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 2333 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 2334 ext4_commit_super(sb, es, 1); 2335 printk(KERN_CRIT 2336 "EXT4-fs (device %s): mount failed\n", 2337 sb->s_id); 2338 goto failed_mount4; 2339 } 2340 } 2341 } else if (journal_inum) { 2342 if (ext4_create_journal(sb, es, journal_inum)) 2343 goto failed_mount3; 2344 } else { 2345 if (!silent) 2346 printk(KERN_ERR 2347 "ext4: No journal on filesystem on %s\n", 2348 sb->s_id); 2349 goto failed_mount3; 2350 } 2351 2352 if (ext4_blocks_count(es) > 0xffffffffULL && 2353 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, 2354 JBD2_FEATURE_INCOMPAT_64BIT)) { 2355 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n"); 2356 goto failed_mount4; 2357 } 2358 2359 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 2360 jbd2_journal_set_features(sbi->s_journal, 2361 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 2362 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2363 } else if (test_opt(sb, JOURNAL_CHECKSUM)) { 2364 jbd2_journal_set_features(sbi->s_journal, 2365 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0); 2366 jbd2_journal_clear_features(sbi->s_journal, 0, 0, 2367 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2368 } else { 2369 jbd2_journal_clear_features(sbi->s_journal, 2370 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 2371 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2372 } 2373 2374 /* We have now updated the journal if required, so we can 2375 * validate the data journaling mode. */ 2376 switch (test_opt(sb, DATA_FLAGS)) { 2377 case 0: 2378 /* No mode set, assume a default based on the journal 2379 * capabilities: ORDERED_DATA if the journal can 2380 * cope, else JOURNAL_DATA 2381 */ 2382 if (jbd2_journal_check_available_features 2383 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) 2384 set_opt(sbi->s_mount_opt, ORDERED_DATA); 2385 else 2386 set_opt(sbi->s_mount_opt, JOURNAL_DATA); 2387 break; 2388 2389 case EXT4_MOUNT_ORDERED_DATA: 2390 case EXT4_MOUNT_WRITEBACK_DATA: 2391 if (!jbd2_journal_check_available_features 2392 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { 2393 printk(KERN_ERR "EXT4-fs: Journal does not support " 2394 "requested data journaling mode\n"); 2395 goto failed_mount4; 2396 } 2397 default: 2398 break; 2399 } 2400 2401 if (test_opt(sb, NOBH)) { 2402 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) { 2403 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - " 2404 "its supported only with writeback mode\n"); 2405 clear_opt(sbi->s_mount_opt, NOBH); 2406 } 2407 } 2408 /* 2409 * The jbd2_journal_load will have done any necessary log recovery, 2410 * so we can safely mount the rest of the filesystem now. 2411 */ 2412 2413 root = ext4_iget(sb, EXT4_ROOT_INO); 2414 if (IS_ERR(root)) { 2415 printk(KERN_ERR "EXT4-fs: get root inode failed\n"); 2416 ret = PTR_ERR(root); 2417 goto failed_mount4; 2418 } 2419 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 2420 iput(root); 2421 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n"); 2422 goto failed_mount4; 2423 } 2424 sb->s_root = d_alloc_root(root); 2425 if (!sb->s_root) { 2426 printk(KERN_ERR "EXT4-fs: get root dentry failed\n"); 2427 iput(root); 2428 ret = -ENOMEM; 2429 goto failed_mount4; 2430 } 2431 2432 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY); 2433 2434 /* determine the minimum size of new large inodes, if present */ 2435 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { 2436 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 2437 EXT4_GOOD_OLD_INODE_SIZE; 2438 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 2439 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { 2440 if (sbi->s_want_extra_isize < 2441 le16_to_cpu(es->s_want_extra_isize)) 2442 sbi->s_want_extra_isize = 2443 le16_to_cpu(es->s_want_extra_isize); 2444 if (sbi->s_want_extra_isize < 2445 le16_to_cpu(es->s_min_extra_isize)) 2446 sbi->s_want_extra_isize = 2447 le16_to_cpu(es->s_min_extra_isize); 2448 } 2449 } 2450 /* Check if enough inode space is available */ 2451 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > 2452 sbi->s_inode_size) { 2453 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 2454 EXT4_GOOD_OLD_INODE_SIZE; 2455 printk(KERN_INFO "EXT4-fs: required extra inode space not" 2456 "available.\n"); 2457 } 2458 2459 /* 2460 * akpm: core read_super() calls in here with the superblock locked. 2461 * That deadlocks, because orphan cleanup needs to lock the superblock 2462 * in numerous places. Here we just pop the lock - it's relatively 2463 * harmless, because we are now ready to accept write_super() requests, 2464 * and aviro says that's the only reason for hanging onto the 2465 * superblock lock. 2466 */ 2467 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; 2468 ext4_orphan_cleanup(sb, es); 2469 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; 2470 if (needs_recovery) 2471 printk(KERN_INFO "EXT4-fs: recovery complete.\n"); 2472 ext4_mark_recovery_complete(sb, es); 2473 printk(KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n", 2474 test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal": 2475 test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered": 2476 "writeback"); 2477 2478 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { 2479 printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - " 2480 "requested data journaling mode\n"); 2481 clear_opt(sbi->s_mount_opt, DELALLOC); 2482 } else if (test_opt(sb, DELALLOC)) 2483 printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n"); 2484 2485 ext4_ext_init(sb); 2486 err = ext4_mb_init(sb, needs_recovery); 2487 if (err) { 2488 printk(KERN_ERR "EXT4-fs: failed to initalize mballoc (%d)\n", 2489 err); 2490 goto failed_mount4; 2491 } 2492 2493 lock_kernel(); 2494 return 0; 2495 2496 cantfind_ext4: 2497 if (!silent) 2498 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n", 2499 sb->s_id); 2500 goto failed_mount; 2501 2502 failed_mount4: 2503 jbd2_journal_destroy(sbi->s_journal); 2504 sbi->s_journal = NULL; 2505 failed_mount3: 2506 percpu_counter_destroy(&sbi->s_freeblocks_counter); 2507 percpu_counter_destroy(&sbi->s_freeinodes_counter); 2508 percpu_counter_destroy(&sbi->s_dirs_counter); 2509 percpu_counter_destroy(&sbi->s_dirtyblocks_counter); 2510 failed_mount2: 2511 for (i = 0; i < db_count; i++) 2512 brelse(sbi->s_group_desc[i]); 2513 kfree(sbi->s_group_desc); 2514 failed_mount: 2515 if (sbi->s_proc) { 2516 remove_proc_entry("inode_readahead_blks", sbi->s_proc); 2517 remove_proc_entry(sb->s_id, ext4_proc_root); 2518 } 2519 #ifdef CONFIG_QUOTA 2520 for (i = 0; i < MAXQUOTAS; i++) 2521 kfree(sbi->s_qf_names[i]); 2522 #endif 2523 ext4_blkdev_remove(sbi); 2524 brelse(bh); 2525 out_fail: 2526 sb->s_fs_info = NULL; 2527 kfree(sbi); 2528 lock_kernel(); 2529 return ret; 2530 } 2531 2532 /* 2533 * Setup any per-fs journal parameters now. We'll do this both on 2534 * initial mount, once the journal has been initialised but before we've 2535 * done any recovery; and again on any subsequent remount. 2536 */ 2537 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) 2538 { 2539 struct ext4_sb_info *sbi = EXT4_SB(sb); 2540 2541 if (sbi->s_commit_interval) 2542 journal->j_commit_interval = sbi->s_commit_interval; 2543 /* We could also set up an ext4-specific default for the commit 2544 * interval here, but for now we'll just fall back to the jbd 2545 * default. */ 2546 2547 spin_lock(&journal->j_state_lock); 2548 if (test_opt(sb, BARRIER)) 2549 journal->j_flags |= JBD2_BARRIER; 2550 else 2551 journal->j_flags &= ~JBD2_BARRIER; 2552 if (test_opt(sb, DATA_ERR_ABORT)) 2553 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR; 2554 else 2555 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR; 2556 spin_unlock(&journal->j_state_lock); 2557 } 2558 2559 static journal_t *ext4_get_journal(struct super_block *sb, 2560 unsigned int journal_inum) 2561 { 2562 struct inode *journal_inode; 2563 journal_t *journal; 2564 2565 /* First, test for the existence of a valid inode on disk. Bad 2566 * things happen if we iget() an unused inode, as the subsequent 2567 * iput() will try to delete it. */ 2568 2569 journal_inode = ext4_iget(sb, journal_inum); 2570 if (IS_ERR(journal_inode)) { 2571 printk(KERN_ERR "EXT4-fs: no journal found.\n"); 2572 return NULL; 2573 } 2574 if (!journal_inode->i_nlink) { 2575 make_bad_inode(journal_inode); 2576 iput(journal_inode); 2577 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n"); 2578 return NULL; 2579 } 2580 2581 jbd_debug(2, "Journal inode found at %p: %lld bytes\n", 2582 journal_inode, journal_inode->i_size); 2583 if (!S_ISREG(journal_inode->i_mode)) { 2584 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n"); 2585 iput(journal_inode); 2586 return NULL; 2587 } 2588 2589 journal = jbd2_journal_init_inode(journal_inode); 2590 if (!journal) { 2591 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n"); 2592 iput(journal_inode); 2593 return NULL; 2594 } 2595 journal->j_private = sb; 2596 ext4_init_journal_params(sb, journal); 2597 return journal; 2598 } 2599 2600 static journal_t *ext4_get_dev_journal(struct super_block *sb, 2601 dev_t j_dev) 2602 { 2603 struct buffer_head *bh; 2604 journal_t *journal; 2605 ext4_fsblk_t start; 2606 ext4_fsblk_t len; 2607 int hblock, blocksize; 2608 ext4_fsblk_t sb_block; 2609 unsigned long offset; 2610 struct ext4_super_block *es; 2611 struct block_device *bdev; 2612 2613 bdev = ext4_blkdev_get(j_dev); 2614 if (bdev == NULL) 2615 return NULL; 2616 2617 if (bd_claim(bdev, sb)) { 2618 printk(KERN_ERR 2619 "EXT4: failed to claim external journal device.\n"); 2620 blkdev_put(bdev); 2621 return NULL; 2622 } 2623 2624 blocksize = sb->s_blocksize; 2625 hblock = bdev_hardsect_size(bdev); 2626 if (blocksize < hblock) { 2627 printk(KERN_ERR 2628 "EXT4-fs: blocksize too small for journal device.\n"); 2629 goto out_bdev; 2630 } 2631 2632 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; 2633 offset = EXT4_MIN_BLOCK_SIZE % blocksize; 2634 set_blocksize(bdev, blocksize); 2635 if (!(bh = __bread(bdev, sb_block, blocksize))) { 2636 printk(KERN_ERR "EXT4-fs: couldn't read superblock of " 2637 "external journal\n"); 2638 goto out_bdev; 2639 } 2640 2641 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 2642 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || 2643 !(le32_to_cpu(es->s_feature_incompat) & 2644 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { 2645 printk(KERN_ERR "EXT4-fs: external journal has " 2646 "bad superblock\n"); 2647 brelse(bh); 2648 goto out_bdev; 2649 } 2650 2651 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { 2652 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n"); 2653 brelse(bh); 2654 goto out_bdev; 2655 } 2656 2657 len = ext4_blocks_count(es); 2658 start = sb_block + 1; 2659 brelse(bh); /* we're done with the superblock */ 2660 2661 journal = jbd2_journal_init_dev(bdev, sb->s_bdev, 2662 start, len, blocksize); 2663 if (!journal) { 2664 printk(KERN_ERR "EXT4-fs: failed to create device journal\n"); 2665 goto out_bdev; 2666 } 2667 journal->j_private = sb; 2668 ll_rw_block(READ, 1, &journal->j_sb_buffer); 2669 wait_on_buffer(journal->j_sb_buffer); 2670 if (!buffer_uptodate(journal->j_sb_buffer)) { 2671 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n"); 2672 goto out_journal; 2673 } 2674 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { 2675 printk(KERN_ERR "EXT4-fs: External journal has more than one " 2676 "user (unsupported) - %d\n", 2677 be32_to_cpu(journal->j_superblock->s_nr_users)); 2678 goto out_journal; 2679 } 2680 EXT4_SB(sb)->journal_bdev = bdev; 2681 ext4_init_journal_params(sb, journal); 2682 return journal; 2683 out_journal: 2684 jbd2_journal_destroy(journal); 2685 out_bdev: 2686 ext4_blkdev_put(bdev); 2687 return NULL; 2688 } 2689 2690 static int ext4_load_journal(struct super_block *sb, 2691 struct ext4_super_block *es, 2692 unsigned long journal_devnum) 2693 { 2694 journal_t *journal; 2695 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); 2696 dev_t journal_dev; 2697 int err = 0; 2698 int really_read_only; 2699 2700 if (journal_devnum && 2701 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 2702 printk(KERN_INFO "EXT4-fs: external journal device major/minor " 2703 "numbers have changed\n"); 2704 journal_dev = new_decode_dev(journal_devnum); 2705 } else 2706 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); 2707 2708 really_read_only = bdev_read_only(sb->s_bdev); 2709 2710 /* 2711 * Are we loading a blank journal or performing recovery after a 2712 * crash? For recovery, we need to check in advance whether we 2713 * can get read-write access to the device. 2714 */ 2715 2716 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 2717 if (sb->s_flags & MS_RDONLY) { 2718 printk(KERN_INFO "EXT4-fs: INFO: recovery " 2719 "required on readonly filesystem.\n"); 2720 if (really_read_only) { 2721 printk(KERN_ERR "EXT4-fs: write access " 2722 "unavailable, cannot proceed.\n"); 2723 return -EROFS; 2724 } 2725 printk(KERN_INFO "EXT4-fs: write access will " 2726 "be enabled during recovery.\n"); 2727 } 2728 } 2729 2730 if (journal_inum && journal_dev) { 2731 printk(KERN_ERR "EXT4-fs: filesystem has both journal " 2732 "and inode journals!\n"); 2733 return -EINVAL; 2734 } 2735 2736 if (journal_inum) { 2737 if (!(journal = ext4_get_journal(sb, journal_inum))) 2738 return -EINVAL; 2739 } else { 2740 if (!(journal = ext4_get_dev_journal(sb, journal_dev))) 2741 return -EINVAL; 2742 } 2743 2744 if (journal->j_flags & JBD2_BARRIER) 2745 printk(KERN_INFO "EXT4-fs: barriers enabled\n"); 2746 else 2747 printk(KERN_INFO "EXT4-fs: barriers disabled\n"); 2748 2749 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { 2750 err = jbd2_journal_update_format(journal); 2751 if (err) { 2752 printk(KERN_ERR "EXT4-fs: error updating journal.\n"); 2753 jbd2_journal_destroy(journal); 2754 return err; 2755 } 2756 } 2757 2758 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) 2759 err = jbd2_journal_wipe(journal, !really_read_only); 2760 if (!err) 2761 err = jbd2_journal_load(journal); 2762 2763 if (err) { 2764 printk(KERN_ERR "EXT4-fs: error loading journal.\n"); 2765 jbd2_journal_destroy(journal); 2766 return err; 2767 } 2768 2769 EXT4_SB(sb)->s_journal = journal; 2770 ext4_clear_journal_err(sb, es); 2771 2772 if (journal_devnum && 2773 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 2774 es->s_journal_dev = cpu_to_le32(journal_devnum); 2775 sb->s_dirt = 1; 2776 2777 /* Make sure we flush the recovery flag to disk. */ 2778 ext4_commit_super(sb, es, 1); 2779 } 2780 2781 return 0; 2782 } 2783 2784 static int ext4_create_journal(struct super_block *sb, 2785 struct ext4_super_block *es, 2786 unsigned int journal_inum) 2787 { 2788 journal_t *journal; 2789 int err; 2790 2791 if (sb->s_flags & MS_RDONLY) { 2792 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to " 2793 "create journal.\n"); 2794 return -EROFS; 2795 } 2796 2797 journal = ext4_get_journal(sb, journal_inum); 2798 if (!journal) 2799 return -EINVAL; 2800 2801 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n", 2802 journal_inum); 2803 2804 err = jbd2_journal_create(journal); 2805 if (err) { 2806 printk(KERN_ERR "EXT4-fs: error creating journal.\n"); 2807 jbd2_journal_destroy(journal); 2808 return -EIO; 2809 } 2810 2811 EXT4_SB(sb)->s_journal = journal; 2812 2813 ext4_update_dynamic_rev(sb); 2814 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2815 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL); 2816 2817 es->s_journal_inum = cpu_to_le32(journal_inum); 2818 sb->s_dirt = 1; 2819 2820 /* Make sure we flush the recovery flag to disk. */ 2821 ext4_commit_super(sb, es, 1); 2822 2823 return 0; 2824 } 2825 2826 static void ext4_commit_super(struct super_block *sb, 2827 struct ext4_super_block *es, int sync) 2828 { 2829 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; 2830 2831 if (!sbh) 2832 return; 2833 if (buffer_write_io_error(sbh)) { 2834 /* 2835 * Oh, dear. A previous attempt to write the 2836 * superblock failed. This could happen because the 2837 * USB device was yanked out. Or it could happen to 2838 * be a transient write error and maybe the block will 2839 * be remapped. Nothing we can do but to retry the 2840 * write and hope for the best. 2841 */ 2842 printk(KERN_ERR "ext4: previous I/O error to " 2843 "superblock detected for %s.\n", sb->s_id); 2844 clear_buffer_write_io_error(sbh); 2845 set_buffer_uptodate(sbh); 2846 } 2847 es->s_wtime = cpu_to_le32(get_seconds()); 2848 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb)); 2849 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb)); 2850 BUFFER_TRACE(sbh, "marking dirty"); 2851 mark_buffer_dirty(sbh); 2852 if (sync) { 2853 sync_dirty_buffer(sbh); 2854 if (buffer_write_io_error(sbh)) { 2855 printk(KERN_ERR "ext4: I/O error while writing " 2856 "superblock for %s.\n", sb->s_id); 2857 clear_buffer_write_io_error(sbh); 2858 set_buffer_uptodate(sbh); 2859 } 2860 } 2861 } 2862 2863 2864 /* 2865 * Have we just finished recovery? If so, and if we are mounting (or 2866 * remounting) the filesystem readonly, then we will end up with a 2867 * consistent fs on disk. Record that fact. 2868 */ 2869 static void ext4_mark_recovery_complete(struct super_block *sb, 2870 struct ext4_super_block *es) 2871 { 2872 journal_t *journal = EXT4_SB(sb)->s_journal; 2873 2874 jbd2_journal_lock_updates(journal); 2875 if (jbd2_journal_flush(journal) < 0) 2876 goto out; 2877 2878 lock_super(sb); 2879 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && 2880 sb->s_flags & MS_RDONLY) { 2881 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2882 sb->s_dirt = 0; 2883 ext4_commit_super(sb, es, 1); 2884 } 2885 unlock_super(sb); 2886 2887 out: 2888 jbd2_journal_unlock_updates(journal); 2889 } 2890 2891 /* 2892 * If we are mounting (or read-write remounting) a filesystem whose journal 2893 * has recorded an error from a previous lifetime, move that error to the 2894 * main filesystem now. 2895 */ 2896 static void ext4_clear_journal_err(struct super_block *sb, 2897 struct ext4_super_block *es) 2898 { 2899 journal_t *journal; 2900 int j_errno; 2901 const char *errstr; 2902 2903 journal = EXT4_SB(sb)->s_journal; 2904 2905 /* 2906 * Now check for any error status which may have been recorded in the 2907 * journal by a prior ext4_error() or ext4_abort() 2908 */ 2909 2910 j_errno = jbd2_journal_errno(journal); 2911 if (j_errno) { 2912 char nbuf[16]; 2913 2914 errstr = ext4_decode_error(sb, j_errno, nbuf); 2915 ext4_warning(sb, __func__, "Filesystem error recorded " 2916 "from previous mount: %s", errstr); 2917 ext4_warning(sb, __func__, "Marking fs in need of " 2918 "filesystem check."); 2919 2920 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 2921 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 2922 ext4_commit_super(sb, es, 1); 2923 2924 jbd2_journal_clear_err(journal); 2925 } 2926 } 2927 2928 /* 2929 * Force the running and committing transactions to commit, 2930 * and wait on the commit. 2931 */ 2932 int ext4_force_commit(struct super_block *sb) 2933 { 2934 journal_t *journal; 2935 int ret; 2936 2937 if (sb->s_flags & MS_RDONLY) 2938 return 0; 2939 2940 journal = EXT4_SB(sb)->s_journal; 2941 sb->s_dirt = 0; 2942 ret = ext4_journal_force_commit(journal); 2943 return ret; 2944 } 2945 2946 /* 2947 * Ext4 always journals updates to the superblock itself, so we don't 2948 * have to propagate any other updates to the superblock on disk at this 2949 * point. Just start an async writeback to get the buffers on their way 2950 * to the disk. 2951 * 2952 * This implicitly triggers the writebehind on sync(). 2953 */ 2954 2955 static void ext4_write_super(struct super_block *sb) 2956 { 2957 if (mutex_trylock(&sb->s_lock) != 0) 2958 BUG(); 2959 sb->s_dirt = 0; 2960 } 2961 2962 static int ext4_sync_fs(struct super_block *sb, int wait) 2963 { 2964 tid_t target; 2965 2966 trace_mark(ext4_sync_fs, "dev %s wait %d", sb->s_id, wait); 2967 sb->s_dirt = 0; 2968 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) { 2969 if (wait) 2970 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target); 2971 } 2972 return 0; 2973 } 2974 2975 /* 2976 * LVM calls this function before a (read-only) snapshot is created. This 2977 * gives us a chance to flush the journal completely and mark the fs clean. 2978 */ 2979 static void ext4_write_super_lockfs(struct super_block *sb) 2980 { 2981 sb->s_dirt = 0; 2982 2983 if (!(sb->s_flags & MS_RDONLY)) { 2984 journal_t *journal = EXT4_SB(sb)->s_journal; 2985 2986 /* Now we set up the journal barrier. */ 2987 jbd2_journal_lock_updates(journal); 2988 2989 /* 2990 * We don't want to clear needs_recovery flag when we failed 2991 * to flush the journal. 2992 */ 2993 if (jbd2_journal_flush(journal) < 0) 2994 return; 2995 2996 /* Journal blocked and flushed, clear needs_recovery flag. */ 2997 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2998 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); 2999 } 3000 } 3001 3002 /* 3003 * Called by LVM after the snapshot is done. We need to reset the RECOVER 3004 * flag here, even though the filesystem is not technically dirty yet. 3005 */ 3006 static void ext4_unlockfs(struct super_block *sb) 3007 { 3008 if (!(sb->s_flags & MS_RDONLY)) { 3009 lock_super(sb); 3010 /* Reser the needs_recovery flag before the fs is unlocked. */ 3011 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 3012 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); 3013 unlock_super(sb); 3014 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 3015 } 3016 } 3017 3018 static int ext4_remount(struct super_block *sb, int *flags, char *data) 3019 { 3020 struct ext4_super_block *es; 3021 struct ext4_sb_info *sbi = EXT4_SB(sb); 3022 ext4_fsblk_t n_blocks_count = 0; 3023 unsigned long old_sb_flags; 3024 struct ext4_mount_options old_opts; 3025 ext4_group_t g; 3026 int err; 3027 #ifdef CONFIG_QUOTA 3028 int i; 3029 #endif 3030 3031 /* Store the original options */ 3032 old_sb_flags = sb->s_flags; 3033 old_opts.s_mount_opt = sbi->s_mount_opt; 3034 old_opts.s_resuid = sbi->s_resuid; 3035 old_opts.s_resgid = sbi->s_resgid; 3036 old_opts.s_commit_interval = sbi->s_commit_interval; 3037 #ifdef CONFIG_QUOTA 3038 old_opts.s_jquota_fmt = sbi->s_jquota_fmt; 3039 for (i = 0; i < MAXQUOTAS; i++) 3040 old_opts.s_qf_names[i] = sbi->s_qf_names[i]; 3041 #endif 3042 3043 /* 3044 * Allow the "check" option to be passed as a remount option. 3045 */ 3046 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) { 3047 err = -EINVAL; 3048 goto restore_opts; 3049 } 3050 3051 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) 3052 ext4_abort(sb, __func__, "Abort forced by user"); 3053 3054 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 3055 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 3056 3057 es = sbi->s_es; 3058 3059 ext4_init_journal_params(sb, sbi->s_journal); 3060 3061 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || 3062 n_blocks_count > ext4_blocks_count(es)) { 3063 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) { 3064 err = -EROFS; 3065 goto restore_opts; 3066 } 3067 3068 if (*flags & MS_RDONLY) { 3069 /* 3070 * First of all, the unconditional stuff we have to do 3071 * to disable replay of the journal when we next remount 3072 */ 3073 sb->s_flags |= MS_RDONLY; 3074 3075 /* 3076 * OK, test if we are remounting a valid rw partition 3077 * readonly, and if so set the rdonly flag and then 3078 * mark the partition as valid again. 3079 */ 3080 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && 3081 (sbi->s_mount_state & EXT4_VALID_FS)) 3082 es->s_state = cpu_to_le16(sbi->s_mount_state); 3083 3084 /* 3085 * We have to unlock super so that we can wait for 3086 * transactions. 3087 */ 3088 unlock_super(sb); 3089 ext4_mark_recovery_complete(sb, es); 3090 lock_super(sb); 3091 } else { 3092 __le32 ret; 3093 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb, 3094 ~EXT4_FEATURE_RO_COMPAT_SUPP))) { 3095 printk(KERN_WARNING "EXT4-fs: %s: couldn't " 3096 "remount RDWR because of unsupported " 3097 "optional features (%x).\n", 3098 sb->s_id, le32_to_cpu(ret)); 3099 err = -EROFS; 3100 goto restore_opts; 3101 } 3102 3103 /* 3104 * Make sure the group descriptor checksums 3105 * are sane. If they aren't, refuse to 3106 * remount r/w. 3107 */ 3108 for (g = 0; g < sbi->s_groups_count; g++) { 3109 struct ext4_group_desc *gdp = 3110 ext4_get_group_desc(sb, g, NULL); 3111 3112 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) { 3113 printk(KERN_ERR 3114 "EXT4-fs: ext4_remount: " 3115 "Checksum for group %lu failed (%u!=%u)\n", 3116 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)), 3117 le16_to_cpu(gdp->bg_checksum)); 3118 err = -EINVAL; 3119 goto restore_opts; 3120 } 3121 } 3122 3123 /* 3124 * If we have an unprocessed orphan list hanging 3125 * around from a previously readonly bdev mount, 3126 * require a full umount/remount for now. 3127 */ 3128 if (es->s_last_orphan) { 3129 printk(KERN_WARNING "EXT4-fs: %s: couldn't " 3130 "remount RDWR because of unprocessed " 3131 "orphan inode list. Please " 3132 "umount/remount instead.\n", 3133 sb->s_id); 3134 err = -EINVAL; 3135 goto restore_opts; 3136 } 3137 3138 /* 3139 * Mounting a RDONLY partition read-write, so reread 3140 * and store the current valid flag. (It may have 3141 * been changed by e2fsck since we originally mounted 3142 * the partition.) 3143 */ 3144 ext4_clear_journal_err(sb, es); 3145 sbi->s_mount_state = le16_to_cpu(es->s_state); 3146 if ((err = ext4_group_extend(sb, es, n_blocks_count))) 3147 goto restore_opts; 3148 if (!ext4_setup_super(sb, es, 0)) 3149 sb->s_flags &= ~MS_RDONLY; 3150 } 3151 } 3152 #ifdef CONFIG_QUOTA 3153 /* Release old quota file names */ 3154 for (i = 0; i < MAXQUOTAS; i++) 3155 if (old_opts.s_qf_names[i] && 3156 old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 3157 kfree(old_opts.s_qf_names[i]); 3158 #endif 3159 return 0; 3160 restore_opts: 3161 sb->s_flags = old_sb_flags; 3162 sbi->s_mount_opt = old_opts.s_mount_opt; 3163 sbi->s_resuid = old_opts.s_resuid; 3164 sbi->s_resgid = old_opts.s_resgid; 3165 sbi->s_commit_interval = old_opts.s_commit_interval; 3166 #ifdef CONFIG_QUOTA 3167 sbi->s_jquota_fmt = old_opts.s_jquota_fmt; 3168 for (i = 0; i < MAXQUOTAS; i++) { 3169 if (sbi->s_qf_names[i] && 3170 old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 3171 kfree(sbi->s_qf_names[i]); 3172 sbi->s_qf_names[i] = old_opts.s_qf_names[i]; 3173 } 3174 #endif 3175 return err; 3176 } 3177 3178 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf) 3179 { 3180 struct super_block *sb = dentry->d_sb; 3181 struct ext4_sb_info *sbi = EXT4_SB(sb); 3182 struct ext4_super_block *es = sbi->s_es; 3183 u64 fsid; 3184 3185 if (test_opt(sb, MINIX_DF)) { 3186 sbi->s_overhead_last = 0; 3187 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) { 3188 ext4_group_t ngroups = sbi->s_groups_count, i; 3189 ext4_fsblk_t overhead = 0; 3190 smp_rmb(); 3191 3192 /* 3193 * Compute the overhead (FS structures). This is constant 3194 * for a given filesystem unless the number of block groups 3195 * changes so we cache the previous value until it does. 3196 */ 3197 3198 /* 3199 * All of the blocks before first_data_block are 3200 * overhead 3201 */ 3202 overhead = le32_to_cpu(es->s_first_data_block); 3203 3204 /* 3205 * Add the overhead attributed to the superblock and 3206 * block group descriptors. If the sparse superblocks 3207 * feature is turned on, then not all groups have this. 3208 */ 3209 for (i = 0; i < ngroups; i++) { 3210 overhead += ext4_bg_has_super(sb, i) + 3211 ext4_bg_num_gdb(sb, i); 3212 cond_resched(); 3213 } 3214 3215 /* 3216 * Every block group has an inode bitmap, a block 3217 * bitmap, and an inode table. 3218 */ 3219 overhead += ngroups * (2 + sbi->s_itb_per_group); 3220 sbi->s_overhead_last = overhead; 3221 smp_wmb(); 3222 sbi->s_blocks_last = ext4_blocks_count(es); 3223 } 3224 3225 buf->f_type = EXT4_SUPER_MAGIC; 3226 buf->f_bsize = sb->s_blocksize; 3227 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last; 3228 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) - 3229 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter); 3230 ext4_free_blocks_count_set(es, buf->f_bfree); 3231 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); 3232 if (buf->f_bfree < ext4_r_blocks_count(es)) 3233 buf->f_bavail = 0; 3234 buf->f_files = le32_to_cpu(es->s_inodes_count); 3235 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); 3236 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); 3237 buf->f_namelen = EXT4_NAME_LEN; 3238 fsid = le64_to_cpup((void *)es->s_uuid) ^ 3239 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 3240 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 3241 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 3242 return 0; 3243 } 3244 3245 /* Helper function for writing quotas on sync - we need to start transaction before quota file 3246 * is locked for write. Otherwise the are possible deadlocks: 3247 * Process 1 Process 2 3248 * ext4_create() quota_sync() 3249 * jbd2_journal_start() write_dquot() 3250 * DQUOT_INIT() down(dqio_mutex) 3251 * down(dqio_mutex) jbd2_journal_start() 3252 * 3253 */ 3254 3255 #ifdef CONFIG_QUOTA 3256 3257 static inline struct inode *dquot_to_inode(struct dquot *dquot) 3258 { 3259 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; 3260 } 3261 3262 static int ext4_dquot_initialize(struct inode *inode, int type) 3263 { 3264 handle_t *handle; 3265 int ret, err; 3266 3267 /* We may create quota structure so we need to reserve enough blocks */ 3268 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb)); 3269 if (IS_ERR(handle)) 3270 return PTR_ERR(handle); 3271 ret = dquot_initialize(inode, type); 3272 err = ext4_journal_stop(handle); 3273 if (!ret) 3274 ret = err; 3275 return ret; 3276 } 3277 3278 static int ext4_dquot_drop(struct inode *inode) 3279 { 3280 handle_t *handle; 3281 int ret, err; 3282 3283 /* We may delete quota structure so we need to reserve enough blocks */ 3284 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb)); 3285 if (IS_ERR(handle)) { 3286 /* 3287 * We call dquot_drop() anyway to at least release references 3288 * to quota structures so that umount does not hang. 3289 */ 3290 dquot_drop(inode); 3291 return PTR_ERR(handle); 3292 } 3293 ret = dquot_drop(inode); 3294 err = ext4_journal_stop(handle); 3295 if (!ret) 3296 ret = err; 3297 return ret; 3298 } 3299 3300 static int ext4_write_dquot(struct dquot *dquot) 3301 { 3302 int ret, err; 3303 handle_t *handle; 3304 struct inode *inode; 3305 3306 inode = dquot_to_inode(dquot); 3307 handle = ext4_journal_start(inode, 3308 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 3309 if (IS_ERR(handle)) 3310 return PTR_ERR(handle); 3311 ret = dquot_commit(dquot); 3312 err = ext4_journal_stop(handle); 3313 if (!ret) 3314 ret = err; 3315 return ret; 3316 } 3317 3318 static int ext4_acquire_dquot(struct dquot *dquot) 3319 { 3320 int ret, err; 3321 handle_t *handle; 3322 3323 handle = ext4_journal_start(dquot_to_inode(dquot), 3324 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 3325 if (IS_ERR(handle)) 3326 return PTR_ERR(handle); 3327 ret = dquot_acquire(dquot); 3328 err = ext4_journal_stop(handle); 3329 if (!ret) 3330 ret = err; 3331 return ret; 3332 } 3333 3334 static int ext4_release_dquot(struct dquot *dquot) 3335 { 3336 int ret, err; 3337 handle_t *handle; 3338 3339 handle = ext4_journal_start(dquot_to_inode(dquot), 3340 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 3341 if (IS_ERR(handle)) { 3342 /* Release dquot anyway to avoid endless cycle in dqput() */ 3343 dquot_release(dquot); 3344 return PTR_ERR(handle); 3345 } 3346 ret = dquot_release(dquot); 3347 err = ext4_journal_stop(handle); 3348 if (!ret) 3349 ret = err; 3350 return ret; 3351 } 3352 3353 static int ext4_mark_dquot_dirty(struct dquot *dquot) 3354 { 3355 /* Are we journaling quotas? */ 3356 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || 3357 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { 3358 dquot_mark_dquot_dirty(dquot); 3359 return ext4_write_dquot(dquot); 3360 } else { 3361 return dquot_mark_dquot_dirty(dquot); 3362 } 3363 } 3364 3365 static int ext4_write_info(struct super_block *sb, int type) 3366 { 3367 int ret, err; 3368 handle_t *handle; 3369 3370 /* Data block + inode block */ 3371 handle = ext4_journal_start(sb->s_root->d_inode, 2); 3372 if (IS_ERR(handle)) 3373 return PTR_ERR(handle); 3374 ret = dquot_commit_info(sb, type); 3375 err = ext4_journal_stop(handle); 3376 if (!ret) 3377 ret = err; 3378 return ret; 3379 } 3380 3381 /* 3382 * Turn on quotas during mount time - we need to find 3383 * the quota file and such... 3384 */ 3385 static int ext4_quota_on_mount(struct super_block *sb, int type) 3386 { 3387 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], 3388 EXT4_SB(sb)->s_jquota_fmt, type); 3389 } 3390 3391 /* 3392 * Standard function to be called on quota_on 3393 */ 3394 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 3395 char *path, int remount) 3396 { 3397 int err; 3398 struct nameidata nd; 3399 3400 if (!test_opt(sb, QUOTA)) 3401 return -EINVAL; 3402 /* When remounting, no checks are needed and in fact, path is NULL */ 3403 if (remount) 3404 return vfs_quota_on(sb, type, format_id, path, remount); 3405 3406 err = path_lookup(path, LOOKUP_FOLLOW, &nd); 3407 if (err) 3408 return err; 3409 3410 /* Quotafile not on the same filesystem? */ 3411 if (nd.path.mnt->mnt_sb != sb) { 3412 path_put(&nd.path); 3413 return -EXDEV; 3414 } 3415 /* Journaling quota? */ 3416 if (EXT4_SB(sb)->s_qf_names[type]) { 3417 /* Quotafile not in fs root? */ 3418 if (nd.path.dentry->d_parent->d_inode != sb->s_root->d_inode) 3419 printk(KERN_WARNING 3420 "EXT4-fs: Quota file not on filesystem root. " 3421 "Journaled quota will not work.\n"); 3422 } 3423 3424 /* 3425 * When we journal data on quota file, we have to flush journal to see 3426 * all updates to the file when we bypass pagecache... 3427 */ 3428 if (ext4_should_journal_data(nd.path.dentry->d_inode)) { 3429 /* 3430 * We don't need to lock updates but journal_flush() could 3431 * otherwise be livelocked... 3432 */ 3433 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 3434 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 3435 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 3436 if (err) { 3437 path_put(&nd.path); 3438 return err; 3439 } 3440 } 3441 3442 err = vfs_quota_on_path(sb, type, format_id, &nd.path); 3443 path_put(&nd.path); 3444 return err; 3445 } 3446 3447 /* Read data from quotafile - avoid pagecache and such because we cannot afford 3448 * acquiring the locks... As quota files are never truncated and quota code 3449 * itself serializes the operations (and noone else should touch the files) 3450 * we don't have to be afraid of races */ 3451 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 3452 size_t len, loff_t off) 3453 { 3454 struct inode *inode = sb_dqopt(sb)->files[type]; 3455 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 3456 int err = 0; 3457 int offset = off & (sb->s_blocksize - 1); 3458 int tocopy; 3459 size_t toread; 3460 struct buffer_head *bh; 3461 loff_t i_size = i_size_read(inode); 3462 3463 if (off > i_size) 3464 return 0; 3465 if (off+len > i_size) 3466 len = i_size-off; 3467 toread = len; 3468 while (toread > 0) { 3469 tocopy = sb->s_blocksize - offset < toread ? 3470 sb->s_blocksize - offset : toread; 3471 bh = ext4_bread(NULL, inode, blk, 0, &err); 3472 if (err) 3473 return err; 3474 if (!bh) /* A hole? */ 3475 memset(data, 0, tocopy); 3476 else 3477 memcpy(data, bh->b_data+offset, tocopy); 3478 brelse(bh); 3479 offset = 0; 3480 toread -= tocopy; 3481 data += tocopy; 3482 blk++; 3483 } 3484 return len; 3485 } 3486 3487 /* Write to quotafile (we know the transaction is already started and has 3488 * enough credits) */ 3489 static ssize_t ext4_quota_write(struct super_block *sb, int type, 3490 const char *data, size_t len, loff_t off) 3491 { 3492 struct inode *inode = sb_dqopt(sb)->files[type]; 3493 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 3494 int err = 0; 3495 int offset = off & (sb->s_blocksize - 1); 3496 int tocopy; 3497 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL; 3498 size_t towrite = len; 3499 struct buffer_head *bh; 3500 handle_t *handle = journal_current_handle(); 3501 3502 if (!handle) { 3503 printk(KERN_WARNING "EXT4-fs: Quota write (off=%llu, len=%llu)" 3504 " cancelled because transaction is not started.\n", 3505 (unsigned long long)off, (unsigned long long)len); 3506 return -EIO; 3507 } 3508 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 3509 while (towrite > 0) { 3510 tocopy = sb->s_blocksize - offset < towrite ? 3511 sb->s_blocksize - offset : towrite; 3512 bh = ext4_bread(handle, inode, blk, 1, &err); 3513 if (!bh) 3514 goto out; 3515 if (journal_quota) { 3516 err = ext4_journal_get_write_access(handle, bh); 3517 if (err) { 3518 brelse(bh); 3519 goto out; 3520 } 3521 } 3522 lock_buffer(bh); 3523 memcpy(bh->b_data+offset, data, tocopy); 3524 flush_dcache_page(bh->b_page); 3525 unlock_buffer(bh); 3526 if (journal_quota) 3527 err = ext4_journal_dirty_metadata(handle, bh); 3528 else { 3529 /* Always do at least ordered writes for quotas */ 3530 err = ext4_jbd2_file_inode(handle, inode); 3531 mark_buffer_dirty(bh); 3532 } 3533 brelse(bh); 3534 if (err) 3535 goto out; 3536 offset = 0; 3537 towrite -= tocopy; 3538 data += tocopy; 3539 blk++; 3540 } 3541 out: 3542 if (len == towrite) { 3543 mutex_unlock(&inode->i_mutex); 3544 return err; 3545 } 3546 if (inode->i_size < off+len-towrite) { 3547 i_size_write(inode, off+len-towrite); 3548 EXT4_I(inode)->i_disksize = inode->i_size; 3549 } 3550 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 3551 ext4_mark_inode_dirty(handle, inode); 3552 mutex_unlock(&inode->i_mutex); 3553 return len - towrite; 3554 } 3555 3556 #endif 3557 3558 static int ext4_get_sb(struct file_system_type *fs_type, 3559 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 3560 { 3561 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt); 3562 } 3563 3564 #ifdef CONFIG_PROC_FS 3565 static int ext4_ui_proc_show(struct seq_file *m, void *v) 3566 { 3567 unsigned int *p = m->private; 3568 3569 seq_printf(m, "%u\n", *p); 3570 return 0; 3571 } 3572 3573 static int ext4_ui_proc_open(struct inode *inode, struct file *file) 3574 { 3575 return single_open(file, ext4_ui_proc_show, PDE(inode)->data); 3576 } 3577 3578 static ssize_t ext4_ui_proc_write(struct file *file, const char __user *buf, 3579 size_t cnt, loff_t *ppos) 3580 { 3581 unsigned int *p = PDE(file->f_path.dentry->d_inode)->data; 3582 char str[32]; 3583 unsigned long value; 3584 3585 if (cnt >= sizeof(str)) 3586 return -EINVAL; 3587 if (copy_from_user(str, buf, cnt)) 3588 return -EFAULT; 3589 value = simple_strtol(str, NULL, 0); 3590 if (value < 0) 3591 return -ERANGE; 3592 *p = value; 3593 return cnt; 3594 } 3595 3596 const struct file_operations ext4_ui_proc_fops = { 3597 .owner = THIS_MODULE, 3598 .open = ext4_ui_proc_open, 3599 .read = seq_read, 3600 .llseek = seq_lseek, 3601 .release = single_release, 3602 .write = ext4_ui_proc_write, 3603 }; 3604 #endif 3605 3606 static struct file_system_type ext4_fs_type = { 3607 .owner = THIS_MODULE, 3608 .name = "ext4", 3609 .get_sb = ext4_get_sb, 3610 .kill_sb = kill_block_super, 3611 .fs_flags = FS_REQUIRES_DEV, 3612 }; 3613 3614 #ifdef CONFIG_EXT4DEV_COMPAT 3615 static int ext4dev_get_sb(struct file_system_type *fs_type, 3616 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 3617 { 3618 printk(KERN_WARNING "EXT4-fs: Update your userspace programs " 3619 "to mount using ext4\n"); 3620 printk(KERN_WARNING "EXT4-fs: ext4dev backwards compatibility " 3621 "will go away by 2.6.31\n"); 3622 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt); 3623 } 3624 3625 static struct file_system_type ext4dev_fs_type = { 3626 .owner = THIS_MODULE, 3627 .name = "ext4dev", 3628 .get_sb = ext4dev_get_sb, 3629 .kill_sb = kill_block_super, 3630 .fs_flags = FS_REQUIRES_DEV, 3631 }; 3632 MODULE_ALIAS("ext4dev"); 3633 #endif 3634 3635 static int __init init_ext4_fs(void) 3636 { 3637 int err; 3638 3639 ext4_proc_root = proc_mkdir("fs/ext4", NULL); 3640 err = init_ext4_mballoc(); 3641 if (err) 3642 return err; 3643 3644 err = init_ext4_xattr(); 3645 if (err) 3646 goto out2; 3647 err = init_inodecache(); 3648 if (err) 3649 goto out1; 3650 err = register_filesystem(&ext4_fs_type); 3651 if (err) 3652 goto out; 3653 #ifdef CONFIG_EXT4DEV_COMPAT 3654 err = register_filesystem(&ext4dev_fs_type); 3655 if (err) { 3656 unregister_filesystem(&ext4_fs_type); 3657 goto out; 3658 } 3659 #endif 3660 return 0; 3661 out: 3662 destroy_inodecache(); 3663 out1: 3664 exit_ext4_xattr(); 3665 out2: 3666 exit_ext4_mballoc(); 3667 return err; 3668 } 3669 3670 static void __exit exit_ext4_fs(void) 3671 { 3672 unregister_filesystem(&ext4_fs_type); 3673 #ifdef CONFIG_EXT4DEV_COMPAT 3674 unregister_filesystem(&ext4dev_fs_type); 3675 #endif 3676 destroy_inodecache(); 3677 exit_ext4_xattr(); 3678 exit_ext4_mballoc(); 3679 remove_proc_entry("fs/ext4", NULL); 3680 } 3681 3682 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); 3683 MODULE_DESCRIPTION("Fourth Extended Filesystem with extents"); 3684 MODULE_LICENSE("GPL"); 3685 module_init(init_ext4_fs) 3686 module_exit(exit_ext4_fs) 3687