1 /* 2 * linux/fs/ext4/super.c 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/fs/minix/inode.c 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 * 15 * Big-endian to little-endian byte-swapping/bitmaps by 16 * David S. Miller (davem@caip.rutgers.edu), 1995 17 */ 18 19 #include <linux/module.h> 20 #include <linux/string.h> 21 #include <linux/fs.h> 22 #include <linux/time.h> 23 #include <linux/jbd2.h> 24 #include <linux/ext4_fs.h> 25 #include <linux/ext4_jbd2.h> 26 #include <linux/slab.h> 27 #include <linux/init.h> 28 #include <linux/blkdev.h> 29 #include <linux/parser.h> 30 #include <linux/smp_lock.h> 31 #include <linux/buffer_head.h> 32 #include <linux/exportfs.h> 33 #include <linux/vfs.h> 34 #include <linux/random.h> 35 #include <linux/mount.h> 36 #include <linux/namei.h> 37 #include <linux/quotaops.h> 38 #include <linux/seq_file.h> 39 #include <linux/log2.h> 40 #include <linux/crc16.h> 41 42 #include <asm/uaccess.h> 43 44 #include "xattr.h" 45 #include "acl.h" 46 #include "namei.h" 47 #include "group.h" 48 49 static int ext4_load_journal(struct super_block *, struct ext4_super_block *, 50 unsigned long journal_devnum); 51 static int ext4_create_journal(struct super_block *, struct ext4_super_block *, 52 unsigned int); 53 static void ext4_commit_super (struct super_block * sb, 54 struct ext4_super_block * es, 55 int sync); 56 static void ext4_mark_recovery_complete(struct super_block * sb, 57 struct ext4_super_block * es); 58 static void ext4_clear_journal_err(struct super_block * sb, 59 struct ext4_super_block * es); 60 static int ext4_sync_fs(struct super_block *sb, int wait); 61 static const char *ext4_decode_error(struct super_block * sb, int errno, 62 char nbuf[16]); 63 static int ext4_remount (struct super_block * sb, int * flags, char * data); 64 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf); 65 static void ext4_unlockfs(struct super_block *sb); 66 static void ext4_write_super (struct super_block * sb); 67 static void ext4_write_super_lockfs(struct super_block *sb); 68 69 70 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 71 struct ext4_group_desc *bg) 72 { 73 return le32_to_cpu(bg->bg_block_bitmap_lo) | 74 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 75 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); 76 } 77 78 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 79 struct ext4_group_desc *bg) 80 { 81 return le32_to_cpu(bg->bg_inode_bitmap_lo) | 82 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 83 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); 84 } 85 86 ext4_fsblk_t ext4_inode_table(struct super_block *sb, 87 struct ext4_group_desc *bg) 88 { 89 return le32_to_cpu(bg->bg_inode_table_lo) | 90 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 91 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); 92 } 93 94 void ext4_block_bitmap_set(struct super_block *sb, 95 struct ext4_group_desc *bg, ext4_fsblk_t blk) 96 { 97 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); 98 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 99 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); 100 } 101 102 void ext4_inode_bitmap_set(struct super_block *sb, 103 struct ext4_group_desc *bg, ext4_fsblk_t blk) 104 { 105 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); 106 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 107 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); 108 } 109 110 void ext4_inode_table_set(struct super_block *sb, 111 struct ext4_group_desc *bg, ext4_fsblk_t blk) 112 { 113 bg->bg_inode_table_lo = cpu_to_le32((u32)blk); 114 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 115 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); 116 } 117 118 /* 119 * Wrappers for jbd2_journal_start/end. 120 * 121 * The only special thing we need to do here is to make sure that all 122 * journal_end calls result in the superblock being marked dirty, so 123 * that sync() will call the filesystem's write_super callback if 124 * appropriate. 125 */ 126 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) 127 { 128 journal_t *journal; 129 130 if (sb->s_flags & MS_RDONLY) 131 return ERR_PTR(-EROFS); 132 133 /* Special case here: if the journal has aborted behind our 134 * backs (eg. EIO in the commit thread), then we still need to 135 * take the FS itself readonly cleanly. */ 136 journal = EXT4_SB(sb)->s_journal; 137 if (is_journal_aborted(journal)) { 138 ext4_abort(sb, __FUNCTION__, 139 "Detected aborted journal"); 140 return ERR_PTR(-EROFS); 141 } 142 143 return jbd2_journal_start(journal, nblocks); 144 } 145 146 /* 147 * The only special thing we need to do here is to make sure that all 148 * jbd2_journal_stop calls result in the superblock being marked dirty, so 149 * that sync() will call the filesystem's write_super callback if 150 * appropriate. 151 */ 152 int __ext4_journal_stop(const char *where, handle_t *handle) 153 { 154 struct super_block *sb; 155 int err; 156 int rc; 157 158 sb = handle->h_transaction->t_journal->j_private; 159 err = handle->h_err; 160 rc = jbd2_journal_stop(handle); 161 162 if (!err) 163 err = rc; 164 if (err) 165 __ext4_std_error(sb, where, err); 166 return err; 167 } 168 169 void ext4_journal_abort_handle(const char *caller, const char *err_fn, 170 struct buffer_head *bh, handle_t *handle, int err) 171 { 172 char nbuf[16]; 173 const char *errstr = ext4_decode_error(NULL, err, nbuf); 174 175 if (bh) 176 BUFFER_TRACE(bh, "abort"); 177 178 if (!handle->h_err) 179 handle->h_err = err; 180 181 if (is_handle_aborted(handle)) 182 return; 183 184 printk(KERN_ERR "%s: aborting transaction: %s in %s\n", 185 caller, errstr, err_fn); 186 187 jbd2_journal_abort_handle(handle); 188 } 189 190 /* Deal with the reporting of failure conditions on a filesystem such as 191 * inconsistencies detected or read IO failures. 192 * 193 * On ext2, we can store the error state of the filesystem in the 194 * superblock. That is not possible on ext4, because we may have other 195 * write ordering constraints on the superblock which prevent us from 196 * writing it out straight away; and given that the journal is about to 197 * be aborted, we can't rely on the current, or future, transactions to 198 * write out the superblock safely. 199 * 200 * We'll just use the jbd2_journal_abort() error code to record an error in 201 * the journal instead. On recovery, the journal will compain about 202 * that error until we've noted it down and cleared it. 203 */ 204 205 static void ext4_handle_error(struct super_block *sb) 206 { 207 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 208 209 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 210 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 211 212 if (sb->s_flags & MS_RDONLY) 213 return; 214 215 if (!test_opt (sb, ERRORS_CONT)) { 216 journal_t *journal = EXT4_SB(sb)->s_journal; 217 218 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; 219 if (journal) 220 jbd2_journal_abort(journal, -EIO); 221 } 222 if (test_opt (sb, ERRORS_RO)) { 223 printk (KERN_CRIT "Remounting filesystem read-only\n"); 224 sb->s_flags |= MS_RDONLY; 225 } 226 ext4_commit_super(sb, es, 1); 227 if (test_opt(sb, ERRORS_PANIC)) 228 panic("EXT4-fs (device %s): panic forced after error\n", 229 sb->s_id); 230 } 231 232 void ext4_error (struct super_block * sb, const char * function, 233 const char * fmt, ...) 234 { 235 va_list args; 236 237 va_start(args, fmt); 238 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function); 239 vprintk(fmt, args); 240 printk("\n"); 241 va_end(args); 242 243 ext4_handle_error(sb); 244 } 245 246 static const char *ext4_decode_error(struct super_block * sb, int errno, 247 char nbuf[16]) 248 { 249 char *errstr = NULL; 250 251 switch (errno) { 252 case -EIO: 253 errstr = "IO failure"; 254 break; 255 case -ENOMEM: 256 errstr = "Out of memory"; 257 break; 258 case -EROFS: 259 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT) 260 errstr = "Journal has aborted"; 261 else 262 errstr = "Readonly filesystem"; 263 break; 264 default: 265 /* If the caller passed in an extra buffer for unknown 266 * errors, textualise them now. Else we just return 267 * NULL. */ 268 if (nbuf) { 269 /* Check for truncated error codes... */ 270 if (snprintf(nbuf, 16, "error %d", -errno) >= 0) 271 errstr = nbuf; 272 } 273 break; 274 } 275 276 return errstr; 277 } 278 279 /* __ext4_std_error decodes expected errors from journaling functions 280 * automatically and invokes the appropriate error response. */ 281 282 void __ext4_std_error (struct super_block * sb, const char * function, 283 int errno) 284 { 285 char nbuf[16]; 286 const char *errstr; 287 288 /* Special case: if the error is EROFS, and we're not already 289 * inside a transaction, then there's really no point in logging 290 * an error. */ 291 if (errno == -EROFS && journal_current_handle() == NULL && 292 (sb->s_flags & MS_RDONLY)) 293 return; 294 295 errstr = ext4_decode_error(sb, errno, nbuf); 296 printk (KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n", 297 sb->s_id, function, errstr); 298 299 ext4_handle_error(sb); 300 } 301 302 /* 303 * ext4_abort is a much stronger failure handler than ext4_error. The 304 * abort function may be used to deal with unrecoverable failures such 305 * as journal IO errors or ENOMEM at a critical moment in log management. 306 * 307 * We unconditionally force the filesystem into an ABORT|READONLY state, 308 * unless the error response on the fs has been set to panic in which 309 * case we take the easy way out and panic immediately. 310 */ 311 312 void ext4_abort (struct super_block * sb, const char * function, 313 const char * fmt, ...) 314 { 315 va_list args; 316 317 printk (KERN_CRIT "ext4_abort called.\n"); 318 319 va_start(args, fmt); 320 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function); 321 vprintk(fmt, args); 322 printk("\n"); 323 va_end(args); 324 325 if (test_opt(sb, ERRORS_PANIC)) 326 panic("EXT4-fs panic from previous error\n"); 327 328 if (sb->s_flags & MS_RDONLY) 329 return; 330 331 printk(KERN_CRIT "Remounting filesystem read-only\n"); 332 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 333 sb->s_flags |= MS_RDONLY; 334 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; 335 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); 336 } 337 338 void ext4_warning (struct super_block * sb, const char * function, 339 const char * fmt, ...) 340 { 341 va_list args; 342 343 va_start(args, fmt); 344 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ", 345 sb->s_id, function); 346 vprintk(fmt, args); 347 printk("\n"); 348 va_end(args); 349 } 350 351 void ext4_update_dynamic_rev(struct super_block *sb) 352 { 353 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 354 355 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) 356 return; 357 358 ext4_warning(sb, __FUNCTION__, 359 "updating to rev %d because of new feature flag, " 360 "running e2fsck is recommended", 361 EXT4_DYNAMIC_REV); 362 363 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); 364 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); 365 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); 366 /* leave es->s_feature_*compat flags alone */ 367 /* es->s_uuid will be set by e2fsck if empty */ 368 369 /* 370 * The rest of the superblock fields should be zero, and if not it 371 * means they are likely already in use, so leave them alone. We 372 * can leave it up to e2fsck to clean up any inconsistencies there. 373 */ 374 } 375 376 int ext4_update_compat_feature(handle_t *handle, 377 struct super_block *sb, __u32 compat) 378 { 379 int err = 0; 380 if (!EXT4_HAS_COMPAT_FEATURE(sb, compat)) { 381 err = ext4_journal_get_write_access(handle, 382 EXT4_SB(sb)->s_sbh); 383 if (err) 384 return err; 385 EXT4_SET_COMPAT_FEATURE(sb, compat); 386 sb->s_dirt = 1; 387 handle->h_sync = 1; 388 BUFFER_TRACE(EXT4_SB(sb)->s_sbh, 389 "call ext4_journal_dirty_met adata"); 390 err = ext4_journal_dirty_metadata(handle, 391 EXT4_SB(sb)->s_sbh); 392 } 393 return err; 394 } 395 396 int ext4_update_rocompat_feature(handle_t *handle, 397 struct super_block *sb, __u32 rocompat) 398 { 399 int err = 0; 400 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, rocompat)) { 401 err = ext4_journal_get_write_access(handle, 402 EXT4_SB(sb)->s_sbh); 403 if (err) 404 return err; 405 EXT4_SET_RO_COMPAT_FEATURE(sb, rocompat); 406 sb->s_dirt = 1; 407 handle->h_sync = 1; 408 BUFFER_TRACE(EXT4_SB(sb)->s_sbh, 409 "call ext4_journal_dirty_met adata"); 410 err = ext4_journal_dirty_metadata(handle, 411 EXT4_SB(sb)->s_sbh); 412 } 413 return err; 414 } 415 416 int ext4_update_incompat_feature(handle_t *handle, 417 struct super_block *sb, __u32 incompat) 418 { 419 int err = 0; 420 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, incompat)) { 421 err = ext4_journal_get_write_access(handle, 422 EXT4_SB(sb)->s_sbh); 423 if (err) 424 return err; 425 EXT4_SET_INCOMPAT_FEATURE(sb, incompat); 426 sb->s_dirt = 1; 427 handle->h_sync = 1; 428 BUFFER_TRACE(EXT4_SB(sb)->s_sbh, 429 "call ext4_journal_dirty_met adata"); 430 err = ext4_journal_dirty_metadata(handle, 431 EXT4_SB(sb)->s_sbh); 432 } 433 return err; 434 } 435 436 /* 437 * Open the external journal device 438 */ 439 static struct block_device *ext4_blkdev_get(dev_t dev) 440 { 441 struct block_device *bdev; 442 char b[BDEVNAME_SIZE]; 443 444 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); 445 if (IS_ERR(bdev)) 446 goto fail; 447 return bdev; 448 449 fail: 450 printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n", 451 __bdevname(dev, b), PTR_ERR(bdev)); 452 return NULL; 453 } 454 455 /* 456 * Release the journal device 457 */ 458 static int ext4_blkdev_put(struct block_device *bdev) 459 { 460 bd_release(bdev); 461 return blkdev_put(bdev); 462 } 463 464 static int ext4_blkdev_remove(struct ext4_sb_info *sbi) 465 { 466 struct block_device *bdev; 467 int ret = -ENODEV; 468 469 bdev = sbi->journal_bdev; 470 if (bdev) { 471 ret = ext4_blkdev_put(bdev); 472 sbi->journal_bdev = NULL; 473 } 474 return ret; 475 } 476 477 static inline struct inode *orphan_list_entry(struct list_head *l) 478 { 479 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; 480 } 481 482 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) 483 { 484 struct list_head *l; 485 486 printk(KERN_ERR "sb orphan head is %d\n", 487 le32_to_cpu(sbi->s_es->s_last_orphan)); 488 489 printk(KERN_ERR "sb_info orphan list:\n"); 490 list_for_each(l, &sbi->s_orphan) { 491 struct inode *inode = orphan_list_entry(l); 492 printk(KERN_ERR " " 493 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", 494 inode->i_sb->s_id, inode->i_ino, inode, 495 inode->i_mode, inode->i_nlink, 496 NEXT_ORPHAN(inode)); 497 } 498 } 499 500 static void ext4_put_super (struct super_block * sb) 501 { 502 struct ext4_sb_info *sbi = EXT4_SB(sb); 503 struct ext4_super_block *es = sbi->s_es; 504 int i; 505 506 ext4_mb_release(sb); 507 ext4_ext_release(sb); 508 ext4_xattr_put_super(sb); 509 jbd2_journal_destroy(sbi->s_journal); 510 if (!(sb->s_flags & MS_RDONLY)) { 511 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 512 es->s_state = cpu_to_le16(sbi->s_mount_state); 513 BUFFER_TRACE(sbi->s_sbh, "marking dirty"); 514 mark_buffer_dirty(sbi->s_sbh); 515 ext4_commit_super(sb, es, 1); 516 } 517 518 for (i = 0; i < sbi->s_gdb_count; i++) 519 brelse(sbi->s_group_desc[i]); 520 kfree(sbi->s_group_desc); 521 percpu_counter_destroy(&sbi->s_freeblocks_counter); 522 percpu_counter_destroy(&sbi->s_freeinodes_counter); 523 percpu_counter_destroy(&sbi->s_dirs_counter); 524 brelse(sbi->s_sbh); 525 #ifdef CONFIG_QUOTA 526 for (i = 0; i < MAXQUOTAS; i++) 527 kfree(sbi->s_qf_names[i]); 528 #endif 529 530 /* Debugging code just in case the in-memory inode orphan list 531 * isn't empty. The on-disk one can be non-empty if we've 532 * detected an error and taken the fs readonly, but the 533 * in-memory list had better be clean by this point. */ 534 if (!list_empty(&sbi->s_orphan)) 535 dump_orphan_list(sb, sbi); 536 J_ASSERT(list_empty(&sbi->s_orphan)); 537 538 invalidate_bdev(sb->s_bdev); 539 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { 540 /* 541 * Invalidate the journal device's buffers. We don't want them 542 * floating about in memory - the physical journal device may 543 * hotswapped, and it breaks the `ro-after' testing code. 544 */ 545 sync_blockdev(sbi->journal_bdev); 546 invalidate_bdev(sbi->journal_bdev); 547 ext4_blkdev_remove(sbi); 548 } 549 sb->s_fs_info = NULL; 550 kfree(sbi); 551 return; 552 } 553 554 static struct kmem_cache *ext4_inode_cachep; 555 556 /* 557 * Called inside transaction, so use GFP_NOFS 558 */ 559 static struct inode *ext4_alloc_inode(struct super_block *sb) 560 { 561 struct ext4_inode_info *ei; 562 563 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); 564 if (!ei) 565 return NULL; 566 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 567 ei->i_acl = EXT4_ACL_NOT_CACHED; 568 ei->i_default_acl = EXT4_ACL_NOT_CACHED; 569 #endif 570 ei->i_block_alloc_info = NULL; 571 ei->vfs_inode.i_version = 1; 572 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); 573 INIT_LIST_HEAD(&ei->i_prealloc_list); 574 spin_lock_init(&ei->i_prealloc_lock); 575 return &ei->vfs_inode; 576 } 577 578 static void ext4_destroy_inode(struct inode *inode) 579 { 580 if (!list_empty(&(EXT4_I(inode)->i_orphan))) { 581 printk("EXT4 Inode %p: orphan list check failed!\n", 582 EXT4_I(inode)); 583 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, 584 EXT4_I(inode), sizeof(struct ext4_inode_info), 585 true); 586 dump_stack(); 587 } 588 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); 589 } 590 591 static void init_once(struct kmem_cache *cachep, void *foo) 592 { 593 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; 594 595 INIT_LIST_HEAD(&ei->i_orphan); 596 #ifdef CONFIG_EXT4DEV_FS_XATTR 597 init_rwsem(&ei->xattr_sem); 598 #endif 599 init_rwsem(&ei->i_data_sem); 600 inode_init_once(&ei->vfs_inode); 601 } 602 603 static int init_inodecache(void) 604 { 605 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", 606 sizeof(struct ext4_inode_info), 607 0, (SLAB_RECLAIM_ACCOUNT| 608 SLAB_MEM_SPREAD), 609 init_once); 610 if (ext4_inode_cachep == NULL) 611 return -ENOMEM; 612 return 0; 613 } 614 615 static void destroy_inodecache(void) 616 { 617 kmem_cache_destroy(ext4_inode_cachep); 618 } 619 620 static void ext4_clear_inode(struct inode *inode) 621 { 622 struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info; 623 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 624 if (EXT4_I(inode)->i_acl && 625 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) { 626 posix_acl_release(EXT4_I(inode)->i_acl); 627 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED; 628 } 629 if (EXT4_I(inode)->i_default_acl && 630 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) { 631 posix_acl_release(EXT4_I(inode)->i_default_acl); 632 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED; 633 } 634 #endif 635 ext4_discard_reservation(inode); 636 EXT4_I(inode)->i_block_alloc_info = NULL; 637 if (unlikely(rsv)) 638 kfree(rsv); 639 } 640 641 static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb) 642 { 643 #if defined(CONFIG_QUOTA) 644 struct ext4_sb_info *sbi = EXT4_SB(sb); 645 646 if (sbi->s_jquota_fmt) 647 seq_printf(seq, ",jqfmt=%s", 648 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0"); 649 650 if (sbi->s_qf_names[USRQUOTA]) 651 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); 652 653 if (sbi->s_qf_names[GRPQUOTA]) 654 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); 655 656 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) 657 seq_puts(seq, ",usrquota"); 658 659 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) 660 seq_puts(seq, ",grpquota"); 661 #endif 662 } 663 664 /* 665 * Show an option if 666 * - it's set to a non-default value OR 667 * - if the per-sb default is different from the global default 668 */ 669 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs) 670 { 671 int def_errors; 672 unsigned long def_mount_opts; 673 struct super_block *sb = vfs->mnt_sb; 674 struct ext4_sb_info *sbi = EXT4_SB(sb); 675 struct ext4_super_block *es = sbi->s_es; 676 677 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 678 def_errors = le16_to_cpu(es->s_errors); 679 680 if (sbi->s_sb_block != 1) 681 seq_printf(seq, ",sb=%llu", sbi->s_sb_block); 682 if (test_opt(sb, MINIX_DF)) 683 seq_puts(seq, ",minixdf"); 684 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS)) 685 seq_puts(seq, ",grpid"); 686 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS)) 687 seq_puts(seq, ",nogrpid"); 688 if (sbi->s_resuid != EXT4_DEF_RESUID || 689 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) { 690 seq_printf(seq, ",resuid=%u", sbi->s_resuid); 691 } 692 if (sbi->s_resgid != EXT4_DEF_RESGID || 693 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) { 694 seq_printf(seq, ",resgid=%u", sbi->s_resgid); 695 } 696 if (test_opt(sb, ERRORS_RO)) { 697 if (def_errors == EXT4_ERRORS_PANIC || 698 def_errors == EXT4_ERRORS_CONTINUE) { 699 seq_puts(seq, ",errors=remount-ro"); 700 } 701 } 702 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) 703 seq_puts(seq, ",errors=continue"); 704 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) 705 seq_puts(seq, ",errors=panic"); 706 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16)) 707 seq_puts(seq, ",nouid32"); 708 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG)) 709 seq_puts(seq, ",debug"); 710 if (test_opt(sb, OLDALLOC)) 711 seq_puts(seq, ",oldalloc"); 712 #ifdef CONFIG_EXT4DEV_FS_XATTR 713 if (test_opt(sb, XATTR_USER) && 714 !(def_mount_opts & EXT4_DEFM_XATTR_USER)) 715 seq_puts(seq, ",user_xattr"); 716 if (!test_opt(sb, XATTR_USER) && 717 (def_mount_opts & EXT4_DEFM_XATTR_USER)) { 718 seq_puts(seq, ",nouser_xattr"); 719 } 720 #endif 721 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 722 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL)) 723 seq_puts(seq, ",acl"); 724 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL)) 725 seq_puts(seq, ",noacl"); 726 #endif 727 if (!test_opt(sb, RESERVATION)) 728 seq_puts(seq, ",noreservation"); 729 if (sbi->s_commit_interval) { 730 seq_printf(seq, ",commit=%u", 731 (unsigned) (sbi->s_commit_interval / HZ)); 732 } 733 if (test_opt(sb, BARRIER)) 734 seq_puts(seq, ",barrier=1"); 735 if (test_opt(sb, NOBH)) 736 seq_puts(seq, ",nobh"); 737 if (!test_opt(sb, EXTENTS)) 738 seq_puts(seq, ",noextents"); 739 if (!test_opt(sb, MBALLOC)) 740 seq_puts(seq, ",nomballoc"); 741 if (test_opt(sb, I_VERSION)) 742 seq_puts(seq, ",i_version"); 743 744 if (sbi->s_stripe) 745 seq_printf(seq, ",stripe=%lu", sbi->s_stripe); 746 /* 747 * journal mode get enabled in different ways 748 * So just print the value even if we didn't specify it 749 */ 750 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 751 seq_puts(seq, ",data=journal"); 752 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 753 seq_puts(seq, ",data=ordered"); 754 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) 755 seq_puts(seq, ",data=writeback"); 756 757 ext4_show_quota_options(seq, sb); 758 return 0; 759 } 760 761 762 static struct inode *ext4_nfs_get_inode(struct super_block *sb, 763 u64 ino, u32 generation) 764 { 765 struct inode *inode; 766 767 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) 768 return ERR_PTR(-ESTALE); 769 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) 770 return ERR_PTR(-ESTALE); 771 772 /* iget isn't really right if the inode is currently unallocated!! 773 * 774 * ext4_read_inode will return a bad_inode if the inode had been 775 * deleted, so we should be safe. 776 * 777 * Currently we don't know the generation for parent directory, so 778 * a generation of 0 means "accept any" 779 */ 780 inode = iget(sb, ino); 781 if (inode == NULL) 782 return ERR_PTR(-ENOMEM); 783 if (is_bad_inode(inode) || 784 (generation && inode->i_generation != generation)) { 785 iput(inode); 786 return ERR_PTR(-ESTALE); 787 } 788 789 return inode; 790 } 791 792 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, 793 int fh_len, int fh_type) 794 { 795 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 796 ext4_nfs_get_inode); 797 } 798 799 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, 800 int fh_len, int fh_type) 801 { 802 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 803 ext4_nfs_get_inode); 804 } 805 806 #ifdef CONFIG_QUOTA 807 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group") 808 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) 809 810 static int ext4_dquot_initialize(struct inode *inode, int type); 811 static int ext4_dquot_drop(struct inode *inode); 812 static int ext4_write_dquot(struct dquot *dquot); 813 static int ext4_acquire_dquot(struct dquot *dquot); 814 static int ext4_release_dquot(struct dquot *dquot); 815 static int ext4_mark_dquot_dirty(struct dquot *dquot); 816 static int ext4_write_info(struct super_block *sb, int type); 817 static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path); 818 static int ext4_quota_on_mount(struct super_block *sb, int type); 819 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 820 size_t len, loff_t off); 821 static ssize_t ext4_quota_write(struct super_block *sb, int type, 822 const char *data, size_t len, loff_t off); 823 824 static struct dquot_operations ext4_quota_operations = { 825 .initialize = ext4_dquot_initialize, 826 .drop = ext4_dquot_drop, 827 .alloc_space = dquot_alloc_space, 828 .alloc_inode = dquot_alloc_inode, 829 .free_space = dquot_free_space, 830 .free_inode = dquot_free_inode, 831 .transfer = dquot_transfer, 832 .write_dquot = ext4_write_dquot, 833 .acquire_dquot = ext4_acquire_dquot, 834 .release_dquot = ext4_release_dquot, 835 .mark_dirty = ext4_mark_dquot_dirty, 836 .write_info = ext4_write_info 837 }; 838 839 static struct quotactl_ops ext4_qctl_operations = { 840 .quota_on = ext4_quota_on, 841 .quota_off = vfs_quota_off, 842 .quota_sync = vfs_quota_sync, 843 .get_info = vfs_get_dqinfo, 844 .set_info = vfs_set_dqinfo, 845 .get_dqblk = vfs_get_dqblk, 846 .set_dqblk = vfs_set_dqblk 847 }; 848 #endif 849 850 static const struct super_operations ext4_sops = { 851 .alloc_inode = ext4_alloc_inode, 852 .destroy_inode = ext4_destroy_inode, 853 .read_inode = ext4_read_inode, 854 .write_inode = ext4_write_inode, 855 .dirty_inode = ext4_dirty_inode, 856 .delete_inode = ext4_delete_inode, 857 .put_super = ext4_put_super, 858 .write_super = ext4_write_super, 859 .sync_fs = ext4_sync_fs, 860 .write_super_lockfs = ext4_write_super_lockfs, 861 .unlockfs = ext4_unlockfs, 862 .statfs = ext4_statfs, 863 .remount_fs = ext4_remount, 864 .clear_inode = ext4_clear_inode, 865 .show_options = ext4_show_options, 866 #ifdef CONFIG_QUOTA 867 .quota_read = ext4_quota_read, 868 .quota_write = ext4_quota_write, 869 #endif 870 }; 871 872 static const struct export_operations ext4_export_ops = { 873 .fh_to_dentry = ext4_fh_to_dentry, 874 .fh_to_parent = ext4_fh_to_parent, 875 .get_parent = ext4_get_parent, 876 }; 877 878 enum { 879 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 880 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, 881 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov, 882 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, 883 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh, 884 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev, 885 Opt_journal_checksum, Opt_journal_async_commit, 886 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, 887 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, 888 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota, 889 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota, 890 Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version, 891 Opt_mballoc, Opt_nomballoc, Opt_stripe, 892 }; 893 894 static match_table_t tokens = { 895 {Opt_bsd_df, "bsddf"}, 896 {Opt_minix_df, "minixdf"}, 897 {Opt_grpid, "grpid"}, 898 {Opt_grpid, "bsdgroups"}, 899 {Opt_nogrpid, "nogrpid"}, 900 {Opt_nogrpid, "sysvgroups"}, 901 {Opt_resgid, "resgid=%u"}, 902 {Opt_resuid, "resuid=%u"}, 903 {Opt_sb, "sb=%u"}, 904 {Opt_err_cont, "errors=continue"}, 905 {Opt_err_panic, "errors=panic"}, 906 {Opt_err_ro, "errors=remount-ro"}, 907 {Opt_nouid32, "nouid32"}, 908 {Opt_nocheck, "nocheck"}, 909 {Opt_nocheck, "check=none"}, 910 {Opt_debug, "debug"}, 911 {Opt_oldalloc, "oldalloc"}, 912 {Opt_orlov, "orlov"}, 913 {Opt_user_xattr, "user_xattr"}, 914 {Opt_nouser_xattr, "nouser_xattr"}, 915 {Opt_acl, "acl"}, 916 {Opt_noacl, "noacl"}, 917 {Opt_reservation, "reservation"}, 918 {Opt_noreservation, "noreservation"}, 919 {Opt_noload, "noload"}, 920 {Opt_nobh, "nobh"}, 921 {Opt_bh, "bh"}, 922 {Opt_commit, "commit=%u"}, 923 {Opt_journal_update, "journal=update"}, 924 {Opt_journal_inum, "journal=%u"}, 925 {Opt_journal_dev, "journal_dev=%u"}, 926 {Opt_journal_checksum, "journal_checksum"}, 927 {Opt_journal_async_commit, "journal_async_commit"}, 928 {Opt_abort, "abort"}, 929 {Opt_data_journal, "data=journal"}, 930 {Opt_data_ordered, "data=ordered"}, 931 {Opt_data_writeback, "data=writeback"}, 932 {Opt_offusrjquota, "usrjquota="}, 933 {Opt_usrjquota, "usrjquota=%s"}, 934 {Opt_offgrpjquota, "grpjquota="}, 935 {Opt_grpjquota, "grpjquota=%s"}, 936 {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, 937 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, 938 {Opt_grpquota, "grpquota"}, 939 {Opt_noquota, "noquota"}, 940 {Opt_quota, "quota"}, 941 {Opt_usrquota, "usrquota"}, 942 {Opt_barrier, "barrier=%u"}, 943 {Opt_extents, "extents"}, 944 {Opt_noextents, "noextents"}, 945 {Opt_i_version, "i_version"}, 946 {Opt_mballoc, "mballoc"}, 947 {Opt_nomballoc, "nomballoc"}, 948 {Opt_stripe, "stripe=%u"}, 949 {Opt_err, NULL}, 950 {Opt_resize, "resize"}, 951 }; 952 953 static ext4_fsblk_t get_sb_block(void **data) 954 { 955 ext4_fsblk_t sb_block; 956 char *options = (char *) *data; 957 958 if (!options || strncmp(options, "sb=", 3) != 0) 959 return 1; /* Default location */ 960 options += 3; 961 /*todo: use simple_strtoll with >32bit ext4 */ 962 sb_block = simple_strtoul(options, &options, 0); 963 if (*options && *options != ',') { 964 printk("EXT4-fs: Invalid sb specification: %s\n", 965 (char *) *data); 966 return 1; 967 } 968 if (*options == ',') 969 options++; 970 *data = (void *) options; 971 return sb_block; 972 } 973 974 static int parse_options (char *options, struct super_block *sb, 975 unsigned int *inum, unsigned long *journal_devnum, 976 ext4_fsblk_t *n_blocks_count, int is_remount) 977 { 978 struct ext4_sb_info *sbi = EXT4_SB(sb); 979 char * p; 980 substring_t args[MAX_OPT_ARGS]; 981 int data_opt = 0; 982 int option; 983 #ifdef CONFIG_QUOTA 984 int qtype; 985 char *qname; 986 #endif 987 988 if (!options) 989 return 1; 990 991 while ((p = strsep (&options, ",")) != NULL) { 992 int token; 993 if (!*p) 994 continue; 995 996 token = match_token(p, tokens, args); 997 switch (token) { 998 case Opt_bsd_df: 999 clear_opt (sbi->s_mount_opt, MINIX_DF); 1000 break; 1001 case Opt_minix_df: 1002 set_opt (sbi->s_mount_opt, MINIX_DF); 1003 break; 1004 case Opt_grpid: 1005 set_opt (sbi->s_mount_opt, GRPID); 1006 break; 1007 case Opt_nogrpid: 1008 clear_opt (sbi->s_mount_opt, GRPID); 1009 break; 1010 case Opt_resuid: 1011 if (match_int(&args[0], &option)) 1012 return 0; 1013 sbi->s_resuid = option; 1014 break; 1015 case Opt_resgid: 1016 if (match_int(&args[0], &option)) 1017 return 0; 1018 sbi->s_resgid = option; 1019 break; 1020 case Opt_sb: 1021 /* handled by get_sb_block() instead of here */ 1022 /* *sb_block = match_int(&args[0]); */ 1023 break; 1024 case Opt_err_panic: 1025 clear_opt (sbi->s_mount_opt, ERRORS_CONT); 1026 clear_opt (sbi->s_mount_opt, ERRORS_RO); 1027 set_opt (sbi->s_mount_opt, ERRORS_PANIC); 1028 break; 1029 case Opt_err_ro: 1030 clear_opt (sbi->s_mount_opt, ERRORS_CONT); 1031 clear_opt (sbi->s_mount_opt, ERRORS_PANIC); 1032 set_opt (sbi->s_mount_opt, ERRORS_RO); 1033 break; 1034 case Opt_err_cont: 1035 clear_opt (sbi->s_mount_opt, ERRORS_RO); 1036 clear_opt (sbi->s_mount_opt, ERRORS_PANIC); 1037 set_opt (sbi->s_mount_opt, ERRORS_CONT); 1038 break; 1039 case Opt_nouid32: 1040 set_opt (sbi->s_mount_opt, NO_UID32); 1041 break; 1042 case Opt_nocheck: 1043 clear_opt (sbi->s_mount_opt, CHECK); 1044 break; 1045 case Opt_debug: 1046 set_opt (sbi->s_mount_opt, DEBUG); 1047 break; 1048 case Opt_oldalloc: 1049 set_opt (sbi->s_mount_opt, OLDALLOC); 1050 break; 1051 case Opt_orlov: 1052 clear_opt (sbi->s_mount_opt, OLDALLOC); 1053 break; 1054 #ifdef CONFIG_EXT4DEV_FS_XATTR 1055 case Opt_user_xattr: 1056 set_opt (sbi->s_mount_opt, XATTR_USER); 1057 break; 1058 case Opt_nouser_xattr: 1059 clear_opt (sbi->s_mount_opt, XATTR_USER); 1060 break; 1061 #else 1062 case Opt_user_xattr: 1063 case Opt_nouser_xattr: 1064 printk("EXT4 (no)user_xattr options not supported\n"); 1065 break; 1066 #endif 1067 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 1068 case Opt_acl: 1069 set_opt(sbi->s_mount_opt, POSIX_ACL); 1070 break; 1071 case Opt_noacl: 1072 clear_opt(sbi->s_mount_opt, POSIX_ACL); 1073 break; 1074 #else 1075 case Opt_acl: 1076 case Opt_noacl: 1077 printk("EXT4 (no)acl options not supported\n"); 1078 break; 1079 #endif 1080 case Opt_reservation: 1081 set_opt(sbi->s_mount_opt, RESERVATION); 1082 break; 1083 case Opt_noreservation: 1084 clear_opt(sbi->s_mount_opt, RESERVATION); 1085 break; 1086 case Opt_journal_update: 1087 /* @@@ FIXME */ 1088 /* Eventually we will want to be able to create 1089 a journal file here. For now, only allow the 1090 user to specify an existing inode to be the 1091 journal file. */ 1092 if (is_remount) { 1093 printk(KERN_ERR "EXT4-fs: cannot specify " 1094 "journal on remount\n"); 1095 return 0; 1096 } 1097 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL); 1098 break; 1099 case Opt_journal_inum: 1100 if (is_remount) { 1101 printk(KERN_ERR "EXT4-fs: cannot specify " 1102 "journal on remount\n"); 1103 return 0; 1104 } 1105 if (match_int(&args[0], &option)) 1106 return 0; 1107 *inum = option; 1108 break; 1109 case Opt_journal_dev: 1110 if (is_remount) { 1111 printk(KERN_ERR "EXT4-fs: cannot specify " 1112 "journal on remount\n"); 1113 return 0; 1114 } 1115 if (match_int(&args[0], &option)) 1116 return 0; 1117 *journal_devnum = option; 1118 break; 1119 case Opt_journal_checksum: 1120 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); 1121 break; 1122 case Opt_journal_async_commit: 1123 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT); 1124 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); 1125 break; 1126 case Opt_noload: 1127 set_opt (sbi->s_mount_opt, NOLOAD); 1128 break; 1129 case Opt_commit: 1130 if (match_int(&args[0], &option)) 1131 return 0; 1132 if (option < 0) 1133 return 0; 1134 if (option == 0) 1135 option = JBD2_DEFAULT_MAX_COMMIT_AGE; 1136 sbi->s_commit_interval = HZ * option; 1137 break; 1138 case Opt_data_journal: 1139 data_opt = EXT4_MOUNT_JOURNAL_DATA; 1140 goto datacheck; 1141 case Opt_data_ordered: 1142 data_opt = EXT4_MOUNT_ORDERED_DATA; 1143 goto datacheck; 1144 case Opt_data_writeback: 1145 data_opt = EXT4_MOUNT_WRITEBACK_DATA; 1146 datacheck: 1147 if (is_remount) { 1148 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS) 1149 != data_opt) { 1150 printk(KERN_ERR 1151 "EXT4-fs: cannot change data " 1152 "mode on remount\n"); 1153 return 0; 1154 } 1155 } else { 1156 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS; 1157 sbi->s_mount_opt |= data_opt; 1158 } 1159 break; 1160 #ifdef CONFIG_QUOTA 1161 case Opt_usrjquota: 1162 qtype = USRQUOTA; 1163 goto set_qf_name; 1164 case Opt_grpjquota: 1165 qtype = GRPQUOTA; 1166 set_qf_name: 1167 if (sb_any_quota_enabled(sb)) { 1168 printk(KERN_ERR 1169 "EXT4-fs: Cannot change journalled " 1170 "quota options when quota turned on.\n"); 1171 return 0; 1172 } 1173 qname = match_strdup(&args[0]); 1174 if (!qname) { 1175 printk(KERN_ERR 1176 "EXT4-fs: not enough memory for " 1177 "storing quotafile name.\n"); 1178 return 0; 1179 } 1180 if (sbi->s_qf_names[qtype] && 1181 strcmp(sbi->s_qf_names[qtype], qname)) { 1182 printk(KERN_ERR 1183 "EXT4-fs: %s quota file already " 1184 "specified.\n", QTYPE2NAME(qtype)); 1185 kfree(qname); 1186 return 0; 1187 } 1188 sbi->s_qf_names[qtype] = qname; 1189 if (strchr(sbi->s_qf_names[qtype], '/')) { 1190 printk(KERN_ERR 1191 "EXT4-fs: quotafile must be on " 1192 "filesystem root.\n"); 1193 kfree(sbi->s_qf_names[qtype]); 1194 sbi->s_qf_names[qtype] = NULL; 1195 return 0; 1196 } 1197 set_opt(sbi->s_mount_opt, QUOTA); 1198 break; 1199 case Opt_offusrjquota: 1200 qtype = USRQUOTA; 1201 goto clear_qf_name; 1202 case Opt_offgrpjquota: 1203 qtype = GRPQUOTA; 1204 clear_qf_name: 1205 if (sb_any_quota_enabled(sb)) { 1206 printk(KERN_ERR "EXT4-fs: Cannot change " 1207 "journalled quota options when " 1208 "quota turned on.\n"); 1209 return 0; 1210 } 1211 /* 1212 * The space will be released later when all options 1213 * are confirmed to be correct 1214 */ 1215 sbi->s_qf_names[qtype] = NULL; 1216 break; 1217 case Opt_jqfmt_vfsold: 1218 sbi->s_jquota_fmt = QFMT_VFS_OLD; 1219 break; 1220 case Opt_jqfmt_vfsv0: 1221 sbi->s_jquota_fmt = QFMT_VFS_V0; 1222 break; 1223 case Opt_quota: 1224 case Opt_usrquota: 1225 set_opt(sbi->s_mount_opt, QUOTA); 1226 set_opt(sbi->s_mount_opt, USRQUOTA); 1227 break; 1228 case Opt_grpquota: 1229 set_opt(sbi->s_mount_opt, QUOTA); 1230 set_opt(sbi->s_mount_opt, GRPQUOTA); 1231 break; 1232 case Opt_noquota: 1233 if (sb_any_quota_enabled(sb)) { 1234 printk(KERN_ERR "EXT4-fs: Cannot change quota " 1235 "options when quota turned on.\n"); 1236 return 0; 1237 } 1238 clear_opt(sbi->s_mount_opt, QUOTA); 1239 clear_opt(sbi->s_mount_opt, USRQUOTA); 1240 clear_opt(sbi->s_mount_opt, GRPQUOTA); 1241 break; 1242 #else 1243 case Opt_quota: 1244 case Opt_usrquota: 1245 case Opt_grpquota: 1246 case Opt_usrjquota: 1247 case Opt_grpjquota: 1248 case Opt_offusrjquota: 1249 case Opt_offgrpjquota: 1250 case Opt_jqfmt_vfsold: 1251 case Opt_jqfmt_vfsv0: 1252 printk(KERN_ERR 1253 "EXT4-fs: journalled quota options not " 1254 "supported.\n"); 1255 break; 1256 case Opt_noquota: 1257 break; 1258 #endif 1259 case Opt_abort: 1260 set_opt(sbi->s_mount_opt, ABORT); 1261 break; 1262 case Opt_barrier: 1263 if (match_int(&args[0], &option)) 1264 return 0; 1265 if (option) 1266 set_opt(sbi->s_mount_opt, BARRIER); 1267 else 1268 clear_opt(sbi->s_mount_opt, BARRIER); 1269 break; 1270 case Opt_ignore: 1271 break; 1272 case Opt_resize: 1273 if (!is_remount) { 1274 printk("EXT4-fs: resize option only available " 1275 "for remount\n"); 1276 return 0; 1277 } 1278 if (match_int(&args[0], &option) != 0) 1279 return 0; 1280 *n_blocks_count = option; 1281 break; 1282 case Opt_nobh: 1283 set_opt(sbi->s_mount_opt, NOBH); 1284 break; 1285 case Opt_bh: 1286 clear_opt(sbi->s_mount_opt, NOBH); 1287 break; 1288 case Opt_extents: 1289 set_opt (sbi->s_mount_opt, EXTENTS); 1290 break; 1291 case Opt_noextents: 1292 clear_opt (sbi->s_mount_opt, EXTENTS); 1293 break; 1294 case Opt_i_version: 1295 set_opt(sbi->s_mount_opt, I_VERSION); 1296 sb->s_flags |= MS_I_VERSION; 1297 break; 1298 case Opt_mballoc: 1299 set_opt(sbi->s_mount_opt, MBALLOC); 1300 break; 1301 case Opt_nomballoc: 1302 clear_opt(sbi->s_mount_opt, MBALLOC); 1303 break; 1304 case Opt_stripe: 1305 if (match_int(&args[0], &option)) 1306 return 0; 1307 if (option < 0) 1308 return 0; 1309 sbi->s_stripe = option; 1310 break; 1311 default: 1312 printk (KERN_ERR 1313 "EXT4-fs: Unrecognized mount option \"%s\" " 1314 "or missing value\n", p); 1315 return 0; 1316 } 1317 } 1318 #ifdef CONFIG_QUOTA 1319 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { 1320 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) && 1321 sbi->s_qf_names[USRQUOTA]) 1322 clear_opt(sbi->s_mount_opt, USRQUOTA); 1323 1324 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) && 1325 sbi->s_qf_names[GRPQUOTA]) 1326 clear_opt(sbi->s_mount_opt, GRPQUOTA); 1327 1328 if ((sbi->s_qf_names[USRQUOTA] && 1329 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) || 1330 (sbi->s_qf_names[GRPQUOTA] && 1331 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) { 1332 printk(KERN_ERR "EXT4-fs: old and new quota " 1333 "format mixing.\n"); 1334 return 0; 1335 } 1336 1337 if (!sbi->s_jquota_fmt) { 1338 printk(KERN_ERR "EXT4-fs: journalled quota format " 1339 "not specified.\n"); 1340 return 0; 1341 } 1342 } else { 1343 if (sbi->s_jquota_fmt) { 1344 printk(KERN_ERR "EXT4-fs: journalled quota format " 1345 "specified with no journalling " 1346 "enabled.\n"); 1347 return 0; 1348 } 1349 } 1350 #endif 1351 return 1; 1352 } 1353 1354 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, 1355 int read_only) 1356 { 1357 struct ext4_sb_info *sbi = EXT4_SB(sb); 1358 int res = 0; 1359 1360 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { 1361 printk (KERN_ERR "EXT4-fs warning: revision level too high, " 1362 "forcing read-only mode\n"); 1363 res = MS_RDONLY; 1364 } 1365 if (read_only) 1366 return res; 1367 if (!(sbi->s_mount_state & EXT4_VALID_FS)) 1368 printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, " 1369 "running e2fsck is recommended\n"); 1370 else if ((sbi->s_mount_state & EXT4_ERROR_FS)) 1371 printk (KERN_WARNING 1372 "EXT4-fs warning: mounting fs with errors, " 1373 "running e2fsck is recommended\n"); 1374 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 1375 le16_to_cpu(es->s_mnt_count) >= 1376 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 1377 printk (KERN_WARNING 1378 "EXT4-fs warning: maximal mount count reached, " 1379 "running e2fsck is recommended\n"); 1380 else if (le32_to_cpu(es->s_checkinterval) && 1381 (le32_to_cpu(es->s_lastcheck) + 1382 le32_to_cpu(es->s_checkinterval) <= get_seconds())) 1383 printk (KERN_WARNING 1384 "EXT4-fs warning: checktime reached, " 1385 "running e2fsck is recommended\n"); 1386 #if 0 1387 /* @@@ We _will_ want to clear the valid bit if we find 1388 * inconsistencies, to force a fsck at reboot. But for 1389 * a plain journaled filesystem we can keep it set as 1390 * valid forever! :) 1391 */ 1392 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS); 1393 #endif 1394 if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) 1395 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); 1396 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1); 1397 es->s_mtime = cpu_to_le32(get_seconds()); 1398 ext4_update_dynamic_rev(sb); 1399 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 1400 1401 ext4_commit_super(sb, es, 1); 1402 if (test_opt(sb, DEBUG)) 1403 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, " 1404 "bpg=%lu, ipg=%lu, mo=%04lx]\n", 1405 sb->s_blocksize, 1406 sbi->s_groups_count, 1407 EXT4_BLOCKS_PER_GROUP(sb), 1408 EXT4_INODES_PER_GROUP(sb), 1409 sbi->s_mount_opt); 1410 1411 printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id); 1412 if (EXT4_SB(sb)->s_journal->j_inode == NULL) { 1413 char b[BDEVNAME_SIZE]; 1414 1415 printk("external journal on %s\n", 1416 bdevname(EXT4_SB(sb)->s_journal->j_dev, b)); 1417 } else { 1418 printk("internal journal\n"); 1419 } 1420 return res; 1421 } 1422 1423 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group, 1424 struct ext4_group_desc *gdp) 1425 { 1426 __u16 crc = 0; 1427 1428 if (sbi->s_es->s_feature_ro_compat & 1429 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { 1430 int offset = offsetof(struct ext4_group_desc, bg_checksum); 1431 __le32 le_group = cpu_to_le32(block_group); 1432 1433 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); 1434 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); 1435 crc = crc16(crc, (__u8 *)gdp, offset); 1436 offset += sizeof(gdp->bg_checksum); /* skip checksum */ 1437 /* for checksum of struct ext4_group_desc do the rest...*/ 1438 if ((sbi->s_es->s_feature_incompat & 1439 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) && 1440 offset < le16_to_cpu(sbi->s_es->s_desc_size)) 1441 crc = crc16(crc, (__u8 *)gdp + offset, 1442 le16_to_cpu(sbi->s_es->s_desc_size) - 1443 offset); 1444 } 1445 1446 return cpu_to_le16(crc); 1447 } 1448 1449 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group, 1450 struct ext4_group_desc *gdp) 1451 { 1452 if ((sbi->s_es->s_feature_ro_compat & 1453 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) && 1454 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp))) 1455 return 0; 1456 1457 return 1; 1458 } 1459 1460 /* Called at mount-time, super-block is locked */ 1461 static int ext4_check_descriptors (struct super_block * sb) 1462 { 1463 struct ext4_sb_info *sbi = EXT4_SB(sb); 1464 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); 1465 ext4_fsblk_t last_block; 1466 ext4_fsblk_t block_bitmap; 1467 ext4_fsblk_t inode_bitmap; 1468 ext4_fsblk_t inode_table; 1469 struct ext4_group_desc * gdp = NULL; 1470 int desc_block = 0; 1471 int flexbg_flag = 0; 1472 ext4_group_t i; 1473 1474 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 1475 flexbg_flag = 1; 1476 1477 ext4_debug ("Checking group descriptors"); 1478 1479 for (i = 0; i < sbi->s_groups_count; i++) 1480 { 1481 if (i == sbi->s_groups_count - 1 || flexbg_flag) 1482 last_block = ext4_blocks_count(sbi->s_es) - 1; 1483 else 1484 last_block = first_block + 1485 (EXT4_BLOCKS_PER_GROUP(sb) - 1); 1486 1487 if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0) 1488 gdp = (struct ext4_group_desc *) 1489 sbi->s_group_desc[desc_block++]->b_data; 1490 block_bitmap = ext4_block_bitmap(sb, gdp); 1491 if (block_bitmap < first_block || block_bitmap > last_block) 1492 { 1493 ext4_error (sb, "ext4_check_descriptors", 1494 "Block bitmap for group %lu" 1495 " not in group (block %llu)!", 1496 i, block_bitmap); 1497 return 0; 1498 } 1499 inode_bitmap = ext4_inode_bitmap(sb, gdp); 1500 if (inode_bitmap < first_block || inode_bitmap > last_block) 1501 { 1502 ext4_error (sb, "ext4_check_descriptors", 1503 "Inode bitmap for group %lu" 1504 " not in group (block %llu)!", 1505 i, inode_bitmap); 1506 return 0; 1507 } 1508 inode_table = ext4_inode_table(sb, gdp); 1509 if (inode_table < first_block || 1510 inode_table + sbi->s_itb_per_group - 1 > last_block) 1511 { 1512 ext4_error (sb, "ext4_check_descriptors", 1513 "Inode table for group %lu" 1514 " not in group (block %llu)!", 1515 i, inode_table); 1516 return 0; 1517 } 1518 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) { 1519 ext4_error(sb, __FUNCTION__, 1520 "Checksum for group %lu failed (%u!=%u)\n", 1521 i, le16_to_cpu(ext4_group_desc_csum(sbi, i, 1522 gdp)), le16_to_cpu(gdp->bg_checksum)); 1523 return 0; 1524 } 1525 if (!flexbg_flag) 1526 first_block += EXT4_BLOCKS_PER_GROUP(sb); 1527 gdp = (struct ext4_group_desc *) 1528 ((__u8 *)gdp + EXT4_DESC_SIZE(sb)); 1529 } 1530 1531 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb)); 1532 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb)); 1533 return 1; 1534 } 1535 1536 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at 1537 * the superblock) which were deleted from all directories, but held open by 1538 * a process at the time of a crash. We walk the list and try to delete these 1539 * inodes at recovery time (only with a read-write filesystem). 1540 * 1541 * In order to keep the orphan inode chain consistent during traversal (in 1542 * case of crash during recovery), we link each inode into the superblock 1543 * orphan list_head and handle it the same way as an inode deletion during 1544 * normal operation (which journals the operations for us). 1545 * 1546 * We only do an iget() and an iput() on each inode, which is very safe if we 1547 * accidentally point at an in-use or already deleted inode. The worst that 1548 * can happen in this case is that we get a "bit already cleared" message from 1549 * ext4_free_inode(). The only reason we would point at a wrong inode is if 1550 * e2fsck was run on this filesystem, and it must have already done the orphan 1551 * inode cleanup for us, so we can safely abort without any further action. 1552 */ 1553 static void ext4_orphan_cleanup (struct super_block * sb, 1554 struct ext4_super_block * es) 1555 { 1556 unsigned int s_flags = sb->s_flags; 1557 int nr_orphans = 0, nr_truncates = 0; 1558 #ifdef CONFIG_QUOTA 1559 int i; 1560 #endif 1561 if (!es->s_last_orphan) { 1562 jbd_debug(4, "no orphan inodes to clean up\n"); 1563 return; 1564 } 1565 1566 if (bdev_read_only(sb->s_bdev)) { 1567 printk(KERN_ERR "EXT4-fs: write access " 1568 "unavailable, skipping orphan cleanup.\n"); 1569 return; 1570 } 1571 1572 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { 1573 if (es->s_last_orphan) 1574 jbd_debug(1, "Errors on filesystem, " 1575 "clearing orphan list.\n"); 1576 es->s_last_orphan = 0; 1577 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); 1578 return; 1579 } 1580 1581 if (s_flags & MS_RDONLY) { 1582 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n", 1583 sb->s_id); 1584 sb->s_flags &= ~MS_RDONLY; 1585 } 1586 #ifdef CONFIG_QUOTA 1587 /* Needed for iput() to work correctly and not trash data */ 1588 sb->s_flags |= MS_ACTIVE; 1589 /* Turn on quotas so that they are updated correctly */ 1590 for (i = 0; i < MAXQUOTAS; i++) { 1591 if (EXT4_SB(sb)->s_qf_names[i]) { 1592 int ret = ext4_quota_on_mount(sb, i); 1593 if (ret < 0) 1594 printk(KERN_ERR 1595 "EXT4-fs: Cannot turn on journalled " 1596 "quota: error %d\n", ret); 1597 } 1598 } 1599 #endif 1600 1601 while (es->s_last_orphan) { 1602 struct inode *inode; 1603 1604 if (!(inode = 1605 ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) { 1606 es->s_last_orphan = 0; 1607 break; 1608 } 1609 1610 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); 1611 DQUOT_INIT(inode); 1612 if (inode->i_nlink) { 1613 printk(KERN_DEBUG 1614 "%s: truncating inode %lu to %Ld bytes\n", 1615 __FUNCTION__, inode->i_ino, inode->i_size); 1616 jbd_debug(2, "truncating inode %lu to %Ld bytes\n", 1617 inode->i_ino, inode->i_size); 1618 ext4_truncate(inode); 1619 nr_truncates++; 1620 } else { 1621 printk(KERN_DEBUG 1622 "%s: deleting unreferenced inode %lu\n", 1623 __FUNCTION__, inode->i_ino); 1624 jbd_debug(2, "deleting unreferenced inode %lu\n", 1625 inode->i_ino); 1626 nr_orphans++; 1627 } 1628 iput(inode); /* The delete magic happens here! */ 1629 } 1630 1631 #define PLURAL(x) (x), ((x)==1) ? "" : "s" 1632 1633 if (nr_orphans) 1634 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n", 1635 sb->s_id, PLURAL(nr_orphans)); 1636 if (nr_truncates) 1637 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n", 1638 sb->s_id, PLURAL(nr_truncates)); 1639 #ifdef CONFIG_QUOTA 1640 /* Turn quotas off */ 1641 for (i = 0; i < MAXQUOTAS; i++) { 1642 if (sb_dqopt(sb)->files[i]) 1643 vfs_quota_off(sb, i); 1644 } 1645 #endif 1646 sb->s_flags = s_flags; /* Restore MS_RDONLY status */ 1647 } 1648 /* 1649 * Maximal extent format file size. 1650 * Resulting logical blkno at s_maxbytes must fit in our on-disk 1651 * extent format containers, within a sector_t, and within i_blocks 1652 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, 1653 * so that won't be a limiting factor. 1654 * 1655 * Note, this does *not* consider any metadata overhead for vfs i_blocks. 1656 */ 1657 static loff_t ext4_max_size(int blkbits) 1658 { 1659 loff_t res; 1660 loff_t upper_limit = MAX_LFS_FILESIZE; 1661 1662 /* small i_blocks in vfs inode? */ 1663 if (sizeof(blkcnt_t) < sizeof(u64)) { 1664 /* 1665 * CONFIG_LSF is not enabled implies the inode 1666 * i_block represent total blocks in 512 bytes 1667 * 32 == size of vfs inode i_blocks * 8 1668 */ 1669 upper_limit = (1LL << 32) - 1; 1670 1671 /* total blocks in file system block size */ 1672 upper_limit >>= (blkbits - 9); 1673 upper_limit <<= blkbits; 1674 } 1675 1676 /* 32-bit extent-start container, ee_block */ 1677 res = 1LL << 32; 1678 res <<= blkbits; 1679 res -= 1; 1680 1681 /* Sanity check against vm- & vfs- imposed limits */ 1682 if (res > upper_limit) 1683 res = upper_limit; 1684 1685 return res; 1686 } 1687 1688 /* 1689 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect 1690 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. 1691 * We need to be 1 filesystem block less than the 2^48 sector limit. 1692 */ 1693 static loff_t ext4_max_bitmap_size(int bits) 1694 { 1695 loff_t res = EXT4_NDIR_BLOCKS; 1696 int meta_blocks; 1697 loff_t upper_limit; 1698 /* This is calculated to be the largest file size for a 1699 * dense, bitmapped file such that the total number of 1700 * sectors in the file, including data and all indirect blocks, 1701 * does not exceed 2^48 -1 1702 * __u32 i_blocks_lo and _u16 i_blocks_high representing the 1703 * total number of 512 bytes blocks of the file 1704 */ 1705 1706 if (sizeof(blkcnt_t) < sizeof(u64)) { 1707 /* 1708 * CONFIG_LSF is not enabled implies the inode 1709 * i_block represent total blocks in 512 bytes 1710 * 32 == size of vfs inode i_blocks * 8 1711 */ 1712 upper_limit = (1LL << 32) - 1; 1713 1714 /* total blocks in file system block size */ 1715 upper_limit >>= (bits - 9); 1716 1717 } else { 1718 /* 1719 * We use 48 bit ext4_inode i_blocks 1720 * With EXT4_HUGE_FILE_FL set the i_blocks 1721 * represent total number of blocks in 1722 * file system block size 1723 */ 1724 upper_limit = (1LL << 48) - 1; 1725 1726 } 1727 1728 /* indirect blocks */ 1729 meta_blocks = 1; 1730 /* double indirect blocks */ 1731 meta_blocks += 1 + (1LL << (bits-2)); 1732 /* tripple indirect blocks */ 1733 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); 1734 1735 upper_limit -= meta_blocks; 1736 upper_limit <<= bits; 1737 1738 res += 1LL << (bits-2); 1739 res += 1LL << (2*(bits-2)); 1740 res += 1LL << (3*(bits-2)); 1741 res <<= bits; 1742 if (res > upper_limit) 1743 res = upper_limit; 1744 1745 if (res > MAX_LFS_FILESIZE) 1746 res = MAX_LFS_FILESIZE; 1747 1748 return res; 1749 } 1750 1751 static ext4_fsblk_t descriptor_loc(struct super_block *sb, 1752 ext4_fsblk_t logical_sb_block, int nr) 1753 { 1754 struct ext4_sb_info *sbi = EXT4_SB(sb); 1755 ext4_group_t bg, first_meta_bg; 1756 int has_super = 0; 1757 1758 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 1759 1760 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || 1761 nr < first_meta_bg) 1762 return logical_sb_block + nr + 1; 1763 bg = sbi->s_desc_per_block * nr; 1764 if (ext4_bg_has_super(sb, bg)) 1765 has_super = 1; 1766 return (has_super + ext4_group_first_block_no(sb, bg)); 1767 } 1768 1769 /** 1770 * ext4_get_stripe_size: Get the stripe size. 1771 * @sbi: In memory super block info 1772 * 1773 * If we have specified it via mount option, then 1774 * use the mount option value. If the value specified at mount time is 1775 * greater than the blocks per group use the super block value. 1776 * If the super block value is greater than blocks per group return 0. 1777 * Allocator needs it be less than blocks per group. 1778 * 1779 */ 1780 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) 1781 { 1782 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); 1783 unsigned long stripe_width = 1784 le32_to_cpu(sbi->s_es->s_raid_stripe_width); 1785 1786 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) 1787 return sbi->s_stripe; 1788 1789 if (stripe_width <= sbi->s_blocks_per_group) 1790 return stripe_width; 1791 1792 if (stride <= sbi->s_blocks_per_group) 1793 return stride; 1794 1795 return 0; 1796 } 1797 1798 static int ext4_fill_super (struct super_block *sb, void *data, int silent) 1799 __releases(kernel_sem) 1800 __acquires(kernel_sem) 1801 1802 { 1803 struct buffer_head * bh; 1804 struct ext4_super_block *es = NULL; 1805 struct ext4_sb_info *sbi; 1806 ext4_fsblk_t block; 1807 ext4_fsblk_t sb_block = get_sb_block(&data); 1808 ext4_fsblk_t logical_sb_block; 1809 unsigned long offset = 0; 1810 unsigned int journal_inum = 0; 1811 unsigned long journal_devnum = 0; 1812 unsigned long def_mount_opts; 1813 struct inode *root; 1814 int blocksize; 1815 int db_count; 1816 int i; 1817 int needs_recovery; 1818 __le32 features; 1819 __u64 blocks_count; 1820 int err; 1821 1822 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 1823 if (!sbi) 1824 return -ENOMEM; 1825 sb->s_fs_info = sbi; 1826 sbi->s_mount_opt = 0; 1827 sbi->s_resuid = EXT4_DEF_RESUID; 1828 sbi->s_resgid = EXT4_DEF_RESGID; 1829 sbi->s_sb_block = sb_block; 1830 1831 unlock_kernel(); 1832 1833 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); 1834 if (!blocksize) { 1835 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n"); 1836 goto out_fail; 1837 } 1838 1839 if (!sb_set_blocksize(sb, blocksize)) { 1840 printk(KERN_ERR "EXT4-fs: bad blocksize %d.\n", blocksize); 1841 goto out_fail; 1842 } 1843 1844 /* 1845 * The ext4 superblock will not be buffer aligned for other than 1kB 1846 * block sizes. We need to calculate the offset from buffer start. 1847 */ 1848 if (blocksize != EXT4_MIN_BLOCK_SIZE) { 1849 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 1850 offset = do_div(logical_sb_block, blocksize); 1851 } else { 1852 logical_sb_block = sb_block; 1853 } 1854 1855 if (!(bh = sb_bread(sb, logical_sb_block))) { 1856 printk (KERN_ERR "EXT4-fs: unable to read superblock\n"); 1857 goto out_fail; 1858 } 1859 /* 1860 * Note: s_es must be initialized as soon as possible because 1861 * some ext4 macro-instructions depend on its value 1862 */ 1863 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 1864 sbi->s_es = es; 1865 sb->s_magic = le16_to_cpu(es->s_magic); 1866 if (sb->s_magic != EXT4_SUPER_MAGIC) 1867 goto cantfind_ext4; 1868 1869 /* Set defaults before we parse the mount options */ 1870 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 1871 if (def_mount_opts & EXT4_DEFM_DEBUG) 1872 set_opt(sbi->s_mount_opt, DEBUG); 1873 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) 1874 set_opt(sbi->s_mount_opt, GRPID); 1875 if (def_mount_opts & EXT4_DEFM_UID16) 1876 set_opt(sbi->s_mount_opt, NO_UID32); 1877 #ifdef CONFIG_EXT4DEV_FS_XATTR 1878 if (def_mount_opts & EXT4_DEFM_XATTR_USER) 1879 set_opt(sbi->s_mount_opt, XATTR_USER); 1880 #endif 1881 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 1882 if (def_mount_opts & EXT4_DEFM_ACL) 1883 set_opt(sbi->s_mount_opt, POSIX_ACL); 1884 #endif 1885 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) 1886 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA; 1887 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) 1888 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA; 1889 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) 1890 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA; 1891 1892 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) 1893 set_opt(sbi->s_mount_opt, ERRORS_PANIC); 1894 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE) 1895 set_opt(sbi->s_mount_opt, ERRORS_CONT); 1896 else 1897 set_opt(sbi->s_mount_opt, ERRORS_RO); 1898 1899 sbi->s_resuid = le16_to_cpu(es->s_def_resuid); 1900 sbi->s_resgid = le16_to_cpu(es->s_def_resgid); 1901 1902 set_opt(sbi->s_mount_opt, RESERVATION); 1903 1904 /* 1905 * turn on extents feature by default in ext4 filesystem 1906 * User -o noextents to turn it off 1907 */ 1908 set_opt(sbi->s_mount_opt, EXTENTS); 1909 /* 1910 * turn on mballoc feature by default in ext4 filesystem 1911 * User -o nomballoc to turn it off 1912 */ 1913 set_opt(sbi->s_mount_opt, MBALLOC); 1914 1915 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum, 1916 NULL, 0)) 1917 goto failed_mount; 1918 1919 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 1920 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 1921 1922 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && 1923 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || 1924 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 1925 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) 1926 printk(KERN_WARNING 1927 "EXT4-fs warning: feature flags set on rev 0 fs, " 1928 "running e2fsck is recommended\n"); 1929 /* 1930 * Check feature flags regardless of the revision level, since we 1931 * previously didn't change the revision level when setting the flags, 1932 * so there is a chance incompat flags are set on a rev 0 filesystem. 1933 */ 1934 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP); 1935 if (features) { 1936 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of " 1937 "unsupported optional features (%x).\n", 1938 sb->s_id, le32_to_cpu(features)); 1939 goto failed_mount; 1940 } 1941 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP); 1942 if (!(sb->s_flags & MS_RDONLY) && features) { 1943 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of " 1944 "unsupported optional features (%x).\n", 1945 sb->s_id, le32_to_cpu(features)); 1946 goto failed_mount; 1947 } 1948 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) { 1949 /* 1950 * Large file size enabled file system can only be 1951 * mount if kernel is build with CONFIG_LSF 1952 */ 1953 if (sizeof(root->i_blocks) < sizeof(u64) && 1954 !(sb->s_flags & MS_RDONLY)) { 1955 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge " 1956 "files cannot be mounted read-write " 1957 "without CONFIG_LSF.\n", sb->s_id); 1958 goto failed_mount; 1959 } 1960 } 1961 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); 1962 1963 if (blocksize < EXT4_MIN_BLOCK_SIZE || 1964 blocksize > EXT4_MAX_BLOCK_SIZE) { 1965 printk(KERN_ERR 1966 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n", 1967 blocksize, sb->s_id); 1968 goto failed_mount; 1969 } 1970 1971 if (sb->s_blocksize != blocksize) { 1972 1973 /* Validate the filesystem blocksize */ 1974 if (!sb_set_blocksize(sb, blocksize)) { 1975 printk(KERN_ERR "EXT4-fs: bad block size %d.\n", 1976 blocksize); 1977 goto failed_mount; 1978 } 1979 1980 brelse (bh); 1981 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 1982 offset = do_div(logical_sb_block, blocksize); 1983 bh = sb_bread(sb, logical_sb_block); 1984 if (!bh) { 1985 printk(KERN_ERR 1986 "EXT4-fs: Can't read superblock on 2nd try.\n"); 1987 goto failed_mount; 1988 } 1989 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); 1990 sbi->s_es = es; 1991 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { 1992 printk (KERN_ERR 1993 "EXT4-fs: Magic mismatch, very weird !\n"); 1994 goto failed_mount; 1995 } 1996 } 1997 1998 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits); 1999 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits); 2000 2001 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { 2002 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; 2003 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; 2004 } else { 2005 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 2006 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 2007 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || 2008 (!is_power_of_2(sbi->s_inode_size)) || 2009 (sbi->s_inode_size > blocksize)) { 2010 printk (KERN_ERR 2011 "EXT4-fs: unsupported inode size: %d\n", 2012 sbi->s_inode_size); 2013 goto failed_mount; 2014 } 2015 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) 2016 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); 2017 } 2018 sbi->s_desc_size = le16_to_cpu(es->s_desc_size); 2019 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { 2020 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || 2021 sbi->s_desc_size > EXT4_MAX_DESC_SIZE || 2022 !is_power_of_2(sbi->s_desc_size)) { 2023 printk(KERN_ERR 2024 "EXT4-fs: unsupported descriptor size %lu\n", 2025 sbi->s_desc_size); 2026 goto failed_mount; 2027 } 2028 } else 2029 sbi->s_desc_size = EXT4_MIN_DESC_SIZE; 2030 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 2031 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 2032 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0) 2033 goto cantfind_ext4; 2034 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); 2035 if (sbi->s_inodes_per_block == 0) 2036 goto cantfind_ext4; 2037 sbi->s_itb_per_group = sbi->s_inodes_per_group / 2038 sbi->s_inodes_per_block; 2039 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); 2040 sbi->s_sbh = bh; 2041 sbi->s_mount_state = le16_to_cpu(es->s_state); 2042 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); 2043 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); 2044 for (i=0; i < 4; i++) 2045 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); 2046 sbi->s_def_hash_version = es->s_def_hash_version; 2047 2048 if (sbi->s_blocks_per_group > blocksize * 8) { 2049 printk (KERN_ERR 2050 "EXT4-fs: #blocks per group too big: %lu\n", 2051 sbi->s_blocks_per_group); 2052 goto failed_mount; 2053 } 2054 if (sbi->s_inodes_per_group > blocksize * 8) { 2055 printk (KERN_ERR 2056 "EXT4-fs: #inodes per group too big: %lu\n", 2057 sbi->s_inodes_per_group); 2058 goto failed_mount; 2059 } 2060 2061 if (ext4_blocks_count(es) > 2062 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { 2063 printk(KERN_ERR "EXT4-fs: filesystem on %s:" 2064 " too large to mount safely\n", sb->s_id); 2065 if (sizeof(sector_t) < 8) 2066 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not " 2067 "enabled\n"); 2068 goto failed_mount; 2069 } 2070 2071 if (EXT4_BLOCKS_PER_GROUP(sb) == 0) 2072 goto cantfind_ext4; 2073 2074 /* ensure blocks_count calculation below doesn't sign-extend */ 2075 if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) < 2076 le32_to_cpu(es->s_first_data_block) + 1) { 2077 printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, " 2078 "first data block %u, blocks per group %lu\n", 2079 ext4_blocks_count(es), 2080 le32_to_cpu(es->s_first_data_block), 2081 EXT4_BLOCKS_PER_GROUP(sb)); 2082 goto failed_mount; 2083 } 2084 blocks_count = (ext4_blocks_count(es) - 2085 le32_to_cpu(es->s_first_data_block) + 2086 EXT4_BLOCKS_PER_GROUP(sb) - 1); 2087 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); 2088 sbi->s_groups_count = blocks_count; 2089 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / 2090 EXT4_DESC_PER_BLOCK(sb); 2091 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *), 2092 GFP_KERNEL); 2093 if (sbi->s_group_desc == NULL) { 2094 printk (KERN_ERR "EXT4-fs: not enough memory\n"); 2095 goto failed_mount; 2096 } 2097 2098 bgl_lock_init(&sbi->s_blockgroup_lock); 2099 2100 for (i = 0; i < db_count; i++) { 2101 block = descriptor_loc(sb, logical_sb_block, i); 2102 sbi->s_group_desc[i] = sb_bread(sb, block); 2103 if (!sbi->s_group_desc[i]) { 2104 printk (KERN_ERR "EXT4-fs: " 2105 "can't read group descriptor %d\n", i); 2106 db_count = i; 2107 goto failed_mount2; 2108 } 2109 } 2110 if (!ext4_check_descriptors (sb)) { 2111 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n"); 2112 goto failed_mount2; 2113 } 2114 sbi->s_gdb_count = db_count; 2115 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 2116 spin_lock_init(&sbi->s_next_gen_lock); 2117 2118 err = percpu_counter_init(&sbi->s_freeblocks_counter, 2119 ext4_count_free_blocks(sb)); 2120 if (!err) { 2121 err = percpu_counter_init(&sbi->s_freeinodes_counter, 2122 ext4_count_free_inodes(sb)); 2123 } 2124 if (!err) { 2125 err = percpu_counter_init(&sbi->s_dirs_counter, 2126 ext4_count_dirs(sb)); 2127 } 2128 if (err) { 2129 printk(KERN_ERR "EXT4-fs: insufficient memory\n"); 2130 goto failed_mount3; 2131 } 2132 2133 /* per fileystem reservation list head & lock */ 2134 spin_lock_init(&sbi->s_rsv_window_lock); 2135 sbi->s_rsv_window_root = RB_ROOT; 2136 /* Add a single, static dummy reservation to the start of the 2137 * reservation window list --- it gives us a placeholder for 2138 * append-at-start-of-list which makes the allocation logic 2139 * _much_ simpler. */ 2140 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; 2141 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; 2142 sbi->s_rsv_window_head.rsv_alloc_hit = 0; 2143 sbi->s_rsv_window_head.rsv_goal_size = 0; 2144 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head); 2145 2146 sbi->s_stripe = ext4_get_stripe_size(sbi); 2147 2148 /* 2149 * set up enough so that it can read an inode 2150 */ 2151 sb->s_op = &ext4_sops; 2152 sb->s_export_op = &ext4_export_ops; 2153 sb->s_xattr = ext4_xattr_handlers; 2154 #ifdef CONFIG_QUOTA 2155 sb->s_qcop = &ext4_qctl_operations; 2156 sb->dq_op = &ext4_quota_operations; 2157 #endif 2158 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ 2159 2160 sb->s_root = NULL; 2161 2162 needs_recovery = (es->s_last_orphan != 0 || 2163 EXT4_HAS_INCOMPAT_FEATURE(sb, 2164 EXT4_FEATURE_INCOMPAT_RECOVER)); 2165 2166 /* 2167 * The first inode we look at is the journal inode. Don't try 2168 * root first: it may be modified in the journal! 2169 */ 2170 if (!test_opt(sb, NOLOAD) && 2171 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 2172 if (ext4_load_journal(sb, es, journal_devnum)) 2173 goto failed_mount3; 2174 } else if (journal_inum) { 2175 if (ext4_create_journal(sb, es, journal_inum)) 2176 goto failed_mount3; 2177 } else { 2178 if (!silent) 2179 printk (KERN_ERR 2180 "ext4: No journal on filesystem on %s\n", 2181 sb->s_id); 2182 goto failed_mount3; 2183 } 2184 2185 if (ext4_blocks_count(es) > 0xffffffffULL && 2186 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, 2187 JBD2_FEATURE_INCOMPAT_64BIT)) { 2188 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n"); 2189 goto failed_mount4; 2190 } 2191 2192 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 2193 jbd2_journal_set_features(sbi->s_journal, 2194 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 2195 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2196 } else if (test_opt(sb, JOURNAL_CHECKSUM)) { 2197 jbd2_journal_set_features(sbi->s_journal, 2198 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0); 2199 jbd2_journal_clear_features(sbi->s_journal, 0, 0, 2200 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2201 } else { 2202 jbd2_journal_clear_features(sbi->s_journal, 2203 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 2204 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2205 } 2206 2207 /* We have now updated the journal if required, so we can 2208 * validate the data journaling mode. */ 2209 switch (test_opt(sb, DATA_FLAGS)) { 2210 case 0: 2211 /* No mode set, assume a default based on the journal 2212 * capabilities: ORDERED_DATA if the journal can 2213 * cope, else JOURNAL_DATA 2214 */ 2215 if (jbd2_journal_check_available_features 2216 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) 2217 set_opt(sbi->s_mount_opt, ORDERED_DATA); 2218 else 2219 set_opt(sbi->s_mount_opt, JOURNAL_DATA); 2220 break; 2221 2222 case EXT4_MOUNT_ORDERED_DATA: 2223 case EXT4_MOUNT_WRITEBACK_DATA: 2224 if (!jbd2_journal_check_available_features 2225 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { 2226 printk(KERN_ERR "EXT4-fs: Journal does not support " 2227 "requested data journaling mode\n"); 2228 goto failed_mount4; 2229 } 2230 default: 2231 break; 2232 } 2233 2234 if (test_opt(sb, NOBH)) { 2235 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) { 2236 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - " 2237 "its supported only with writeback mode\n"); 2238 clear_opt(sbi->s_mount_opt, NOBH); 2239 } 2240 } 2241 /* 2242 * The jbd2_journal_load will have done any necessary log recovery, 2243 * so we can safely mount the rest of the filesystem now. 2244 */ 2245 2246 root = iget(sb, EXT4_ROOT_INO); 2247 sb->s_root = d_alloc_root(root); 2248 if (!sb->s_root) { 2249 printk(KERN_ERR "EXT4-fs: get root inode failed\n"); 2250 iput(root); 2251 goto failed_mount4; 2252 } 2253 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 2254 dput(sb->s_root); 2255 sb->s_root = NULL; 2256 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n"); 2257 goto failed_mount4; 2258 } 2259 2260 ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY); 2261 2262 /* determine the minimum size of new large inodes, if present */ 2263 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { 2264 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 2265 EXT4_GOOD_OLD_INODE_SIZE; 2266 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 2267 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { 2268 if (sbi->s_want_extra_isize < 2269 le16_to_cpu(es->s_want_extra_isize)) 2270 sbi->s_want_extra_isize = 2271 le16_to_cpu(es->s_want_extra_isize); 2272 if (sbi->s_want_extra_isize < 2273 le16_to_cpu(es->s_min_extra_isize)) 2274 sbi->s_want_extra_isize = 2275 le16_to_cpu(es->s_min_extra_isize); 2276 } 2277 } 2278 /* Check if enough inode space is available */ 2279 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > 2280 sbi->s_inode_size) { 2281 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 2282 EXT4_GOOD_OLD_INODE_SIZE; 2283 printk(KERN_INFO "EXT4-fs: required extra inode space not" 2284 "available.\n"); 2285 } 2286 2287 /* 2288 * akpm: core read_super() calls in here with the superblock locked. 2289 * That deadlocks, because orphan cleanup needs to lock the superblock 2290 * in numerous places. Here we just pop the lock - it's relatively 2291 * harmless, because we are now ready to accept write_super() requests, 2292 * and aviro says that's the only reason for hanging onto the 2293 * superblock lock. 2294 */ 2295 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; 2296 ext4_orphan_cleanup(sb, es); 2297 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; 2298 if (needs_recovery) 2299 printk (KERN_INFO "EXT4-fs: recovery complete.\n"); 2300 ext4_mark_recovery_complete(sb, es); 2301 printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n", 2302 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal": 2303 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered": 2304 "writeback"); 2305 2306 ext4_ext_init(sb); 2307 ext4_mb_init(sb, needs_recovery); 2308 2309 lock_kernel(); 2310 return 0; 2311 2312 cantfind_ext4: 2313 if (!silent) 2314 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n", 2315 sb->s_id); 2316 goto failed_mount; 2317 2318 failed_mount4: 2319 jbd2_journal_destroy(sbi->s_journal); 2320 failed_mount3: 2321 percpu_counter_destroy(&sbi->s_freeblocks_counter); 2322 percpu_counter_destroy(&sbi->s_freeinodes_counter); 2323 percpu_counter_destroy(&sbi->s_dirs_counter); 2324 failed_mount2: 2325 for (i = 0; i < db_count; i++) 2326 brelse(sbi->s_group_desc[i]); 2327 kfree(sbi->s_group_desc); 2328 failed_mount: 2329 #ifdef CONFIG_QUOTA 2330 for (i = 0; i < MAXQUOTAS; i++) 2331 kfree(sbi->s_qf_names[i]); 2332 #endif 2333 ext4_blkdev_remove(sbi); 2334 brelse(bh); 2335 out_fail: 2336 sb->s_fs_info = NULL; 2337 kfree(sbi); 2338 lock_kernel(); 2339 return -EINVAL; 2340 } 2341 2342 /* 2343 * Setup any per-fs journal parameters now. We'll do this both on 2344 * initial mount, once the journal has been initialised but before we've 2345 * done any recovery; and again on any subsequent remount. 2346 */ 2347 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) 2348 { 2349 struct ext4_sb_info *sbi = EXT4_SB(sb); 2350 2351 if (sbi->s_commit_interval) 2352 journal->j_commit_interval = sbi->s_commit_interval; 2353 /* We could also set up an ext4-specific default for the commit 2354 * interval here, but for now we'll just fall back to the jbd 2355 * default. */ 2356 2357 spin_lock(&journal->j_state_lock); 2358 if (test_opt(sb, BARRIER)) 2359 journal->j_flags |= JBD2_BARRIER; 2360 else 2361 journal->j_flags &= ~JBD2_BARRIER; 2362 spin_unlock(&journal->j_state_lock); 2363 } 2364 2365 static journal_t *ext4_get_journal(struct super_block *sb, 2366 unsigned int journal_inum) 2367 { 2368 struct inode *journal_inode; 2369 journal_t *journal; 2370 2371 /* First, test for the existence of a valid inode on disk. Bad 2372 * things happen if we iget() an unused inode, as the subsequent 2373 * iput() will try to delete it. */ 2374 2375 journal_inode = iget(sb, journal_inum); 2376 if (!journal_inode) { 2377 printk(KERN_ERR "EXT4-fs: no journal found.\n"); 2378 return NULL; 2379 } 2380 if (!journal_inode->i_nlink) { 2381 make_bad_inode(journal_inode); 2382 iput(journal_inode); 2383 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n"); 2384 return NULL; 2385 } 2386 2387 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n", 2388 journal_inode, journal_inode->i_size); 2389 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) { 2390 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n"); 2391 iput(journal_inode); 2392 return NULL; 2393 } 2394 2395 journal = jbd2_journal_init_inode(journal_inode); 2396 if (!journal) { 2397 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n"); 2398 iput(journal_inode); 2399 return NULL; 2400 } 2401 journal->j_private = sb; 2402 ext4_init_journal_params(sb, journal); 2403 return journal; 2404 } 2405 2406 static journal_t *ext4_get_dev_journal(struct super_block *sb, 2407 dev_t j_dev) 2408 { 2409 struct buffer_head * bh; 2410 journal_t *journal; 2411 ext4_fsblk_t start; 2412 ext4_fsblk_t len; 2413 int hblock, blocksize; 2414 ext4_fsblk_t sb_block; 2415 unsigned long offset; 2416 struct ext4_super_block * es; 2417 struct block_device *bdev; 2418 2419 bdev = ext4_blkdev_get(j_dev); 2420 if (bdev == NULL) 2421 return NULL; 2422 2423 if (bd_claim(bdev, sb)) { 2424 printk(KERN_ERR 2425 "EXT4: failed to claim external journal device.\n"); 2426 blkdev_put(bdev); 2427 return NULL; 2428 } 2429 2430 blocksize = sb->s_blocksize; 2431 hblock = bdev_hardsect_size(bdev); 2432 if (blocksize < hblock) { 2433 printk(KERN_ERR 2434 "EXT4-fs: blocksize too small for journal device.\n"); 2435 goto out_bdev; 2436 } 2437 2438 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; 2439 offset = EXT4_MIN_BLOCK_SIZE % blocksize; 2440 set_blocksize(bdev, blocksize); 2441 if (!(bh = __bread(bdev, sb_block, blocksize))) { 2442 printk(KERN_ERR "EXT4-fs: couldn't read superblock of " 2443 "external journal\n"); 2444 goto out_bdev; 2445 } 2446 2447 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 2448 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || 2449 !(le32_to_cpu(es->s_feature_incompat) & 2450 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { 2451 printk(KERN_ERR "EXT4-fs: external journal has " 2452 "bad superblock\n"); 2453 brelse(bh); 2454 goto out_bdev; 2455 } 2456 2457 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { 2458 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n"); 2459 brelse(bh); 2460 goto out_bdev; 2461 } 2462 2463 len = ext4_blocks_count(es); 2464 start = sb_block + 1; 2465 brelse(bh); /* we're done with the superblock */ 2466 2467 journal = jbd2_journal_init_dev(bdev, sb->s_bdev, 2468 start, len, blocksize); 2469 if (!journal) { 2470 printk(KERN_ERR "EXT4-fs: failed to create device journal\n"); 2471 goto out_bdev; 2472 } 2473 journal->j_private = sb; 2474 ll_rw_block(READ, 1, &journal->j_sb_buffer); 2475 wait_on_buffer(journal->j_sb_buffer); 2476 if (!buffer_uptodate(journal->j_sb_buffer)) { 2477 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n"); 2478 goto out_journal; 2479 } 2480 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { 2481 printk(KERN_ERR "EXT4-fs: External journal has more than one " 2482 "user (unsupported) - %d\n", 2483 be32_to_cpu(journal->j_superblock->s_nr_users)); 2484 goto out_journal; 2485 } 2486 EXT4_SB(sb)->journal_bdev = bdev; 2487 ext4_init_journal_params(sb, journal); 2488 return journal; 2489 out_journal: 2490 jbd2_journal_destroy(journal); 2491 out_bdev: 2492 ext4_blkdev_put(bdev); 2493 return NULL; 2494 } 2495 2496 static int ext4_load_journal(struct super_block *sb, 2497 struct ext4_super_block *es, 2498 unsigned long journal_devnum) 2499 { 2500 journal_t *journal; 2501 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); 2502 dev_t journal_dev; 2503 int err = 0; 2504 int really_read_only; 2505 2506 if (journal_devnum && 2507 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 2508 printk(KERN_INFO "EXT4-fs: external journal device major/minor " 2509 "numbers have changed\n"); 2510 journal_dev = new_decode_dev(journal_devnum); 2511 } else 2512 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); 2513 2514 really_read_only = bdev_read_only(sb->s_bdev); 2515 2516 /* 2517 * Are we loading a blank journal or performing recovery after a 2518 * crash? For recovery, we need to check in advance whether we 2519 * can get read-write access to the device. 2520 */ 2521 2522 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 2523 if (sb->s_flags & MS_RDONLY) { 2524 printk(KERN_INFO "EXT4-fs: INFO: recovery " 2525 "required on readonly filesystem.\n"); 2526 if (really_read_only) { 2527 printk(KERN_ERR "EXT4-fs: write access " 2528 "unavailable, cannot proceed.\n"); 2529 return -EROFS; 2530 } 2531 printk (KERN_INFO "EXT4-fs: write access will " 2532 "be enabled during recovery.\n"); 2533 } 2534 } 2535 2536 if (journal_inum && journal_dev) { 2537 printk(KERN_ERR "EXT4-fs: filesystem has both journal " 2538 "and inode journals!\n"); 2539 return -EINVAL; 2540 } 2541 2542 if (journal_inum) { 2543 if (!(journal = ext4_get_journal(sb, journal_inum))) 2544 return -EINVAL; 2545 } else { 2546 if (!(journal = ext4_get_dev_journal(sb, journal_dev))) 2547 return -EINVAL; 2548 } 2549 2550 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { 2551 err = jbd2_journal_update_format(journal); 2552 if (err) { 2553 printk(KERN_ERR "EXT4-fs: error updating journal.\n"); 2554 jbd2_journal_destroy(journal); 2555 return err; 2556 } 2557 } 2558 2559 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) 2560 err = jbd2_journal_wipe(journal, !really_read_only); 2561 if (!err) 2562 err = jbd2_journal_load(journal); 2563 2564 if (err) { 2565 printk(KERN_ERR "EXT4-fs: error loading journal.\n"); 2566 jbd2_journal_destroy(journal); 2567 return err; 2568 } 2569 2570 EXT4_SB(sb)->s_journal = journal; 2571 ext4_clear_journal_err(sb, es); 2572 2573 if (journal_devnum && 2574 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 2575 es->s_journal_dev = cpu_to_le32(journal_devnum); 2576 sb->s_dirt = 1; 2577 2578 /* Make sure we flush the recovery flag to disk. */ 2579 ext4_commit_super(sb, es, 1); 2580 } 2581 2582 return 0; 2583 } 2584 2585 static int ext4_create_journal(struct super_block * sb, 2586 struct ext4_super_block * es, 2587 unsigned int journal_inum) 2588 { 2589 journal_t *journal; 2590 int err; 2591 2592 if (sb->s_flags & MS_RDONLY) { 2593 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to " 2594 "create journal.\n"); 2595 return -EROFS; 2596 } 2597 2598 journal = ext4_get_journal(sb, journal_inum); 2599 if (!journal) 2600 return -EINVAL; 2601 2602 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n", 2603 journal_inum); 2604 2605 err = jbd2_journal_create(journal); 2606 if (err) { 2607 printk(KERN_ERR "EXT4-fs: error creating journal.\n"); 2608 jbd2_journal_destroy(journal); 2609 return -EIO; 2610 } 2611 2612 EXT4_SB(sb)->s_journal = journal; 2613 2614 ext4_update_dynamic_rev(sb); 2615 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2616 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL); 2617 2618 es->s_journal_inum = cpu_to_le32(journal_inum); 2619 sb->s_dirt = 1; 2620 2621 /* Make sure we flush the recovery flag to disk. */ 2622 ext4_commit_super(sb, es, 1); 2623 2624 return 0; 2625 } 2626 2627 static void ext4_commit_super (struct super_block * sb, 2628 struct ext4_super_block * es, 2629 int sync) 2630 { 2631 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; 2632 2633 if (!sbh) 2634 return; 2635 es->s_wtime = cpu_to_le32(get_seconds()); 2636 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb)); 2637 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb)); 2638 BUFFER_TRACE(sbh, "marking dirty"); 2639 mark_buffer_dirty(sbh); 2640 if (sync) 2641 sync_dirty_buffer(sbh); 2642 } 2643 2644 2645 /* 2646 * Have we just finished recovery? If so, and if we are mounting (or 2647 * remounting) the filesystem readonly, then we will end up with a 2648 * consistent fs on disk. Record that fact. 2649 */ 2650 static void ext4_mark_recovery_complete(struct super_block * sb, 2651 struct ext4_super_block * es) 2652 { 2653 journal_t *journal = EXT4_SB(sb)->s_journal; 2654 2655 jbd2_journal_lock_updates(journal); 2656 jbd2_journal_flush(journal); 2657 lock_super(sb); 2658 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && 2659 sb->s_flags & MS_RDONLY) { 2660 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2661 sb->s_dirt = 0; 2662 ext4_commit_super(sb, es, 1); 2663 } 2664 unlock_super(sb); 2665 jbd2_journal_unlock_updates(journal); 2666 } 2667 2668 /* 2669 * If we are mounting (or read-write remounting) a filesystem whose journal 2670 * has recorded an error from a previous lifetime, move that error to the 2671 * main filesystem now. 2672 */ 2673 static void ext4_clear_journal_err(struct super_block * sb, 2674 struct ext4_super_block * es) 2675 { 2676 journal_t *journal; 2677 int j_errno; 2678 const char *errstr; 2679 2680 journal = EXT4_SB(sb)->s_journal; 2681 2682 /* 2683 * Now check for any error status which may have been recorded in the 2684 * journal by a prior ext4_error() or ext4_abort() 2685 */ 2686 2687 j_errno = jbd2_journal_errno(journal); 2688 if (j_errno) { 2689 char nbuf[16]; 2690 2691 errstr = ext4_decode_error(sb, j_errno, nbuf); 2692 ext4_warning(sb, __FUNCTION__, "Filesystem error recorded " 2693 "from previous mount: %s", errstr); 2694 ext4_warning(sb, __FUNCTION__, "Marking fs in need of " 2695 "filesystem check."); 2696 2697 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 2698 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 2699 ext4_commit_super (sb, es, 1); 2700 2701 jbd2_journal_clear_err(journal); 2702 } 2703 } 2704 2705 /* 2706 * Force the running and committing transactions to commit, 2707 * and wait on the commit. 2708 */ 2709 int ext4_force_commit(struct super_block *sb) 2710 { 2711 journal_t *journal; 2712 int ret; 2713 2714 if (sb->s_flags & MS_RDONLY) 2715 return 0; 2716 2717 journal = EXT4_SB(sb)->s_journal; 2718 sb->s_dirt = 0; 2719 ret = ext4_journal_force_commit(journal); 2720 return ret; 2721 } 2722 2723 /* 2724 * Ext4 always journals updates to the superblock itself, so we don't 2725 * have to propagate any other updates to the superblock on disk at this 2726 * point. Just start an async writeback to get the buffers on their way 2727 * to the disk. 2728 * 2729 * This implicitly triggers the writebehind on sync(). 2730 */ 2731 2732 static void ext4_write_super (struct super_block * sb) 2733 { 2734 if (mutex_trylock(&sb->s_lock) != 0) 2735 BUG(); 2736 sb->s_dirt = 0; 2737 } 2738 2739 static int ext4_sync_fs(struct super_block *sb, int wait) 2740 { 2741 tid_t target; 2742 2743 sb->s_dirt = 0; 2744 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) { 2745 if (wait) 2746 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target); 2747 } 2748 return 0; 2749 } 2750 2751 /* 2752 * LVM calls this function before a (read-only) snapshot is created. This 2753 * gives us a chance to flush the journal completely and mark the fs clean. 2754 */ 2755 static void ext4_write_super_lockfs(struct super_block *sb) 2756 { 2757 sb->s_dirt = 0; 2758 2759 if (!(sb->s_flags & MS_RDONLY)) { 2760 journal_t *journal = EXT4_SB(sb)->s_journal; 2761 2762 /* Now we set up the journal barrier. */ 2763 jbd2_journal_lock_updates(journal); 2764 jbd2_journal_flush(journal); 2765 2766 /* Journal blocked and flushed, clear needs_recovery flag. */ 2767 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2768 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); 2769 } 2770 } 2771 2772 /* 2773 * Called by LVM after the snapshot is done. We need to reset the RECOVER 2774 * flag here, even though the filesystem is not technically dirty yet. 2775 */ 2776 static void ext4_unlockfs(struct super_block *sb) 2777 { 2778 if (!(sb->s_flags & MS_RDONLY)) { 2779 lock_super(sb); 2780 /* Reser the needs_recovery flag before the fs is unlocked. */ 2781 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2782 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); 2783 unlock_super(sb); 2784 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 2785 } 2786 } 2787 2788 static int ext4_remount (struct super_block * sb, int * flags, char * data) 2789 { 2790 struct ext4_super_block * es; 2791 struct ext4_sb_info *sbi = EXT4_SB(sb); 2792 ext4_fsblk_t n_blocks_count = 0; 2793 unsigned long old_sb_flags; 2794 struct ext4_mount_options old_opts; 2795 int err; 2796 #ifdef CONFIG_QUOTA 2797 int i; 2798 #endif 2799 2800 /* Store the original options */ 2801 old_sb_flags = sb->s_flags; 2802 old_opts.s_mount_opt = sbi->s_mount_opt; 2803 old_opts.s_resuid = sbi->s_resuid; 2804 old_opts.s_resgid = sbi->s_resgid; 2805 old_opts.s_commit_interval = sbi->s_commit_interval; 2806 #ifdef CONFIG_QUOTA 2807 old_opts.s_jquota_fmt = sbi->s_jquota_fmt; 2808 for (i = 0; i < MAXQUOTAS; i++) 2809 old_opts.s_qf_names[i] = sbi->s_qf_names[i]; 2810 #endif 2811 2812 /* 2813 * Allow the "check" option to be passed as a remount option. 2814 */ 2815 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) { 2816 err = -EINVAL; 2817 goto restore_opts; 2818 } 2819 2820 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) 2821 ext4_abort(sb, __FUNCTION__, "Abort forced by user"); 2822 2823 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 2824 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 2825 2826 es = sbi->s_es; 2827 2828 ext4_init_journal_params(sb, sbi->s_journal); 2829 2830 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || 2831 n_blocks_count > ext4_blocks_count(es)) { 2832 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) { 2833 err = -EROFS; 2834 goto restore_opts; 2835 } 2836 2837 if (*flags & MS_RDONLY) { 2838 /* 2839 * First of all, the unconditional stuff we have to do 2840 * to disable replay of the journal when we next remount 2841 */ 2842 sb->s_flags |= MS_RDONLY; 2843 2844 /* 2845 * OK, test if we are remounting a valid rw partition 2846 * readonly, and if so set the rdonly flag and then 2847 * mark the partition as valid again. 2848 */ 2849 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && 2850 (sbi->s_mount_state & EXT4_VALID_FS)) 2851 es->s_state = cpu_to_le16(sbi->s_mount_state); 2852 2853 /* 2854 * We have to unlock super so that we can wait for 2855 * transactions. 2856 */ 2857 unlock_super(sb); 2858 ext4_mark_recovery_complete(sb, es); 2859 lock_super(sb); 2860 } else { 2861 __le32 ret; 2862 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb, 2863 ~EXT4_FEATURE_RO_COMPAT_SUPP))) { 2864 printk(KERN_WARNING "EXT4-fs: %s: couldn't " 2865 "remount RDWR because of unsupported " 2866 "optional features (%x).\n", 2867 sb->s_id, le32_to_cpu(ret)); 2868 err = -EROFS; 2869 goto restore_opts; 2870 } 2871 2872 /* 2873 * If we have an unprocessed orphan list hanging 2874 * around from a previously readonly bdev mount, 2875 * require a full umount/remount for now. 2876 */ 2877 if (es->s_last_orphan) { 2878 printk(KERN_WARNING "EXT4-fs: %s: couldn't " 2879 "remount RDWR because of unprocessed " 2880 "orphan inode list. Please " 2881 "umount/remount instead.\n", 2882 sb->s_id); 2883 err = -EINVAL; 2884 goto restore_opts; 2885 } 2886 2887 /* 2888 * Mounting a RDONLY partition read-write, so reread 2889 * and store the current valid flag. (It may have 2890 * been changed by e2fsck since we originally mounted 2891 * the partition.) 2892 */ 2893 ext4_clear_journal_err(sb, es); 2894 sbi->s_mount_state = le16_to_cpu(es->s_state); 2895 if ((err = ext4_group_extend(sb, es, n_blocks_count))) 2896 goto restore_opts; 2897 if (!ext4_setup_super (sb, es, 0)) 2898 sb->s_flags &= ~MS_RDONLY; 2899 } 2900 } 2901 #ifdef CONFIG_QUOTA 2902 /* Release old quota file names */ 2903 for (i = 0; i < MAXQUOTAS; i++) 2904 if (old_opts.s_qf_names[i] && 2905 old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 2906 kfree(old_opts.s_qf_names[i]); 2907 #endif 2908 return 0; 2909 restore_opts: 2910 sb->s_flags = old_sb_flags; 2911 sbi->s_mount_opt = old_opts.s_mount_opt; 2912 sbi->s_resuid = old_opts.s_resuid; 2913 sbi->s_resgid = old_opts.s_resgid; 2914 sbi->s_commit_interval = old_opts.s_commit_interval; 2915 #ifdef CONFIG_QUOTA 2916 sbi->s_jquota_fmt = old_opts.s_jquota_fmt; 2917 for (i = 0; i < MAXQUOTAS; i++) { 2918 if (sbi->s_qf_names[i] && 2919 old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 2920 kfree(sbi->s_qf_names[i]); 2921 sbi->s_qf_names[i] = old_opts.s_qf_names[i]; 2922 } 2923 #endif 2924 return err; 2925 } 2926 2927 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf) 2928 { 2929 struct super_block *sb = dentry->d_sb; 2930 struct ext4_sb_info *sbi = EXT4_SB(sb); 2931 struct ext4_super_block *es = sbi->s_es; 2932 u64 fsid; 2933 2934 if (test_opt(sb, MINIX_DF)) { 2935 sbi->s_overhead_last = 0; 2936 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) { 2937 ext4_group_t ngroups = sbi->s_groups_count, i; 2938 ext4_fsblk_t overhead = 0; 2939 smp_rmb(); 2940 2941 /* 2942 * Compute the overhead (FS structures). This is constant 2943 * for a given filesystem unless the number of block groups 2944 * changes so we cache the previous value until it does. 2945 */ 2946 2947 /* 2948 * All of the blocks before first_data_block are 2949 * overhead 2950 */ 2951 overhead = le32_to_cpu(es->s_first_data_block); 2952 2953 /* 2954 * Add the overhead attributed to the superblock and 2955 * block group descriptors. If the sparse superblocks 2956 * feature is turned on, then not all groups have this. 2957 */ 2958 for (i = 0; i < ngroups; i++) { 2959 overhead += ext4_bg_has_super(sb, i) + 2960 ext4_bg_num_gdb(sb, i); 2961 cond_resched(); 2962 } 2963 2964 /* 2965 * Every block group has an inode bitmap, a block 2966 * bitmap, and an inode table. 2967 */ 2968 overhead += ngroups * (2 + sbi->s_itb_per_group); 2969 sbi->s_overhead_last = overhead; 2970 smp_wmb(); 2971 sbi->s_blocks_last = ext4_blocks_count(es); 2972 } 2973 2974 buf->f_type = EXT4_SUPER_MAGIC; 2975 buf->f_bsize = sb->s_blocksize; 2976 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last; 2977 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter); 2978 ext4_free_blocks_count_set(es, buf->f_bfree); 2979 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); 2980 if (buf->f_bfree < ext4_r_blocks_count(es)) 2981 buf->f_bavail = 0; 2982 buf->f_files = le32_to_cpu(es->s_inodes_count); 2983 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); 2984 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); 2985 buf->f_namelen = EXT4_NAME_LEN; 2986 fsid = le64_to_cpup((void *)es->s_uuid) ^ 2987 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 2988 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 2989 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 2990 return 0; 2991 } 2992 2993 /* Helper function for writing quotas on sync - we need to start transaction before quota file 2994 * is locked for write. Otherwise the are possible deadlocks: 2995 * Process 1 Process 2 2996 * ext4_create() quota_sync() 2997 * jbd2_journal_start() write_dquot() 2998 * DQUOT_INIT() down(dqio_mutex) 2999 * down(dqio_mutex) jbd2_journal_start() 3000 * 3001 */ 3002 3003 #ifdef CONFIG_QUOTA 3004 3005 static inline struct inode *dquot_to_inode(struct dquot *dquot) 3006 { 3007 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; 3008 } 3009 3010 static int ext4_dquot_initialize(struct inode *inode, int type) 3011 { 3012 handle_t *handle; 3013 int ret, err; 3014 3015 /* We may create quota structure so we need to reserve enough blocks */ 3016 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb)); 3017 if (IS_ERR(handle)) 3018 return PTR_ERR(handle); 3019 ret = dquot_initialize(inode, type); 3020 err = ext4_journal_stop(handle); 3021 if (!ret) 3022 ret = err; 3023 return ret; 3024 } 3025 3026 static int ext4_dquot_drop(struct inode *inode) 3027 { 3028 handle_t *handle; 3029 int ret, err; 3030 3031 /* We may delete quota structure so we need to reserve enough blocks */ 3032 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb)); 3033 if (IS_ERR(handle)) 3034 return PTR_ERR(handle); 3035 ret = dquot_drop(inode); 3036 err = ext4_journal_stop(handle); 3037 if (!ret) 3038 ret = err; 3039 return ret; 3040 } 3041 3042 static int ext4_write_dquot(struct dquot *dquot) 3043 { 3044 int ret, err; 3045 handle_t *handle; 3046 struct inode *inode; 3047 3048 inode = dquot_to_inode(dquot); 3049 handle = ext4_journal_start(inode, 3050 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 3051 if (IS_ERR(handle)) 3052 return PTR_ERR(handle); 3053 ret = dquot_commit(dquot); 3054 err = ext4_journal_stop(handle); 3055 if (!ret) 3056 ret = err; 3057 return ret; 3058 } 3059 3060 static int ext4_acquire_dquot(struct dquot *dquot) 3061 { 3062 int ret, err; 3063 handle_t *handle; 3064 3065 handle = ext4_journal_start(dquot_to_inode(dquot), 3066 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 3067 if (IS_ERR(handle)) 3068 return PTR_ERR(handle); 3069 ret = dquot_acquire(dquot); 3070 err = ext4_journal_stop(handle); 3071 if (!ret) 3072 ret = err; 3073 return ret; 3074 } 3075 3076 static int ext4_release_dquot(struct dquot *dquot) 3077 { 3078 int ret, err; 3079 handle_t *handle; 3080 3081 handle = ext4_journal_start(dquot_to_inode(dquot), 3082 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 3083 if (IS_ERR(handle)) { 3084 /* Release dquot anyway to avoid endless cycle in dqput() */ 3085 dquot_release(dquot); 3086 return PTR_ERR(handle); 3087 } 3088 ret = dquot_release(dquot); 3089 err = ext4_journal_stop(handle); 3090 if (!ret) 3091 ret = err; 3092 return ret; 3093 } 3094 3095 static int ext4_mark_dquot_dirty(struct dquot *dquot) 3096 { 3097 /* Are we journalling quotas? */ 3098 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || 3099 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { 3100 dquot_mark_dquot_dirty(dquot); 3101 return ext4_write_dquot(dquot); 3102 } else { 3103 return dquot_mark_dquot_dirty(dquot); 3104 } 3105 } 3106 3107 static int ext4_write_info(struct super_block *sb, int type) 3108 { 3109 int ret, err; 3110 handle_t *handle; 3111 3112 /* Data block + inode block */ 3113 handle = ext4_journal_start(sb->s_root->d_inode, 2); 3114 if (IS_ERR(handle)) 3115 return PTR_ERR(handle); 3116 ret = dquot_commit_info(sb, type); 3117 err = ext4_journal_stop(handle); 3118 if (!ret) 3119 ret = err; 3120 return ret; 3121 } 3122 3123 /* 3124 * Turn on quotas during mount time - we need to find 3125 * the quota file and such... 3126 */ 3127 static int ext4_quota_on_mount(struct super_block *sb, int type) 3128 { 3129 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], 3130 EXT4_SB(sb)->s_jquota_fmt, type); 3131 } 3132 3133 /* 3134 * Standard function to be called on quota_on 3135 */ 3136 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 3137 char *path) 3138 { 3139 int err; 3140 struct nameidata nd; 3141 3142 if (!test_opt(sb, QUOTA)) 3143 return -EINVAL; 3144 /* Not journalling quota? */ 3145 if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] && 3146 !EXT4_SB(sb)->s_qf_names[GRPQUOTA]) 3147 return vfs_quota_on(sb, type, format_id, path); 3148 err = path_lookup(path, LOOKUP_FOLLOW, &nd); 3149 if (err) 3150 return err; 3151 /* Quotafile not on the same filesystem? */ 3152 if (nd.mnt->mnt_sb != sb) { 3153 path_release(&nd); 3154 return -EXDEV; 3155 } 3156 /* Quotafile not of fs root? */ 3157 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode) 3158 printk(KERN_WARNING 3159 "EXT4-fs: Quota file not on filesystem root. " 3160 "Journalled quota will not work.\n"); 3161 path_release(&nd); 3162 return vfs_quota_on(sb, type, format_id, path); 3163 } 3164 3165 /* Read data from quotafile - avoid pagecache and such because we cannot afford 3166 * acquiring the locks... As quota files are never truncated and quota code 3167 * itself serializes the operations (and noone else should touch the files) 3168 * we don't have to be afraid of races */ 3169 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 3170 size_t len, loff_t off) 3171 { 3172 struct inode *inode = sb_dqopt(sb)->files[type]; 3173 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 3174 int err = 0; 3175 int offset = off & (sb->s_blocksize - 1); 3176 int tocopy; 3177 size_t toread; 3178 struct buffer_head *bh; 3179 loff_t i_size = i_size_read(inode); 3180 3181 if (off > i_size) 3182 return 0; 3183 if (off+len > i_size) 3184 len = i_size-off; 3185 toread = len; 3186 while (toread > 0) { 3187 tocopy = sb->s_blocksize - offset < toread ? 3188 sb->s_blocksize - offset : toread; 3189 bh = ext4_bread(NULL, inode, blk, 0, &err); 3190 if (err) 3191 return err; 3192 if (!bh) /* A hole? */ 3193 memset(data, 0, tocopy); 3194 else 3195 memcpy(data, bh->b_data+offset, tocopy); 3196 brelse(bh); 3197 offset = 0; 3198 toread -= tocopy; 3199 data += tocopy; 3200 blk++; 3201 } 3202 return len; 3203 } 3204 3205 /* Write to quotafile (we know the transaction is already started and has 3206 * enough credits) */ 3207 static ssize_t ext4_quota_write(struct super_block *sb, int type, 3208 const char *data, size_t len, loff_t off) 3209 { 3210 struct inode *inode = sb_dqopt(sb)->files[type]; 3211 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 3212 int err = 0; 3213 int offset = off & (sb->s_blocksize - 1); 3214 int tocopy; 3215 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL; 3216 size_t towrite = len; 3217 struct buffer_head *bh; 3218 handle_t *handle = journal_current_handle(); 3219 3220 if (!handle) { 3221 printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)" 3222 " cancelled because transaction is not started.\n", 3223 (unsigned long long)off, (unsigned long long)len); 3224 return -EIO; 3225 } 3226 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 3227 while (towrite > 0) { 3228 tocopy = sb->s_blocksize - offset < towrite ? 3229 sb->s_blocksize - offset : towrite; 3230 bh = ext4_bread(handle, inode, blk, 1, &err); 3231 if (!bh) 3232 goto out; 3233 if (journal_quota) { 3234 err = ext4_journal_get_write_access(handle, bh); 3235 if (err) { 3236 brelse(bh); 3237 goto out; 3238 } 3239 } 3240 lock_buffer(bh); 3241 memcpy(bh->b_data+offset, data, tocopy); 3242 flush_dcache_page(bh->b_page); 3243 unlock_buffer(bh); 3244 if (journal_quota) 3245 err = ext4_journal_dirty_metadata(handle, bh); 3246 else { 3247 /* Always do at least ordered writes for quotas */ 3248 err = ext4_journal_dirty_data(handle, bh); 3249 mark_buffer_dirty(bh); 3250 } 3251 brelse(bh); 3252 if (err) 3253 goto out; 3254 offset = 0; 3255 towrite -= tocopy; 3256 data += tocopy; 3257 blk++; 3258 } 3259 out: 3260 if (len == towrite) 3261 return err; 3262 if (inode->i_size < off+len-towrite) { 3263 i_size_write(inode, off+len-towrite); 3264 EXT4_I(inode)->i_disksize = inode->i_size; 3265 } 3266 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 3267 ext4_mark_inode_dirty(handle, inode); 3268 mutex_unlock(&inode->i_mutex); 3269 return len - towrite; 3270 } 3271 3272 #endif 3273 3274 static int ext4_get_sb(struct file_system_type *fs_type, 3275 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 3276 { 3277 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt); 3278 } 3279 3280 static struct file_system_type ext4dev_fs_type = { 3281 .owner = THIS_MODULE, 3282 .name = "ext4dev", 3283 .get_sb = ext4_get_sb, 3284 .kill_sb = kill_block_super, 3285 .fs_flags = FS_REQUIRES_DEV, 3286 }; 3287 3288 static int __init init_ext4_fs(void) 3289 { 3290 int err; 3291 3292 err = init_ext4_mballoc(); 3293 if (err) 3294 return err; 3295 3296 err = init_ext4_xattr(); 3297 if (err) 3298 goto out2; 3299 err = init_inodecache(); 3300 if (err) 3301 goto out1; 3302 err = register_filesystem(&ext4dev_fs_type); 3303 if (err) 3304 goto out; 3305 return 0; 3306 out: 3307 destroy_inodecache(); 3308 out1: 3309 exit_ext4_xattr(); 3310 out2: 3311 exit_ext4_mballoc(); 3312 return err; 3313 } 3314 3315 static void __exit exit_ext4_fs(void) 3316 { 3317 unregister_filesystem(&ext4dev_fs_type); 3318 destroy_inodecache(); 3319 exit_ext4_xattr(); 3320 exit_ext4_mballoc(); 3321 } 3322 3323 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); 3324 MODULE_DESCRIPTION("Fourth Extended Filesystem with extents"); 3325 MODULE_LICENSE("GPL"); 3326 module_init(init_ext4_fs) 3327 module_exit(exit_ext4_fs) 3328