1 /* 2 * linux/fs/ext4/super.c 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/fs/minix/inode.c 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 * 15 * Big-endian to little-endian byte-swapping/bitmaps by 16 * David S. Miller (davem@caip.rutgers.edu), 1995 17 */ 18 19 #include <linux/module.h> 20 #include <linux/string.h> 21 #include <linux/fs.h> 22 #include <linux/time.h> 23 #include <linux/jbd2.h> 24 #include <linux/slab.h> 25 #include <linux/init.h> 26 #include <linux/blkdev.h> 27 #include <linux/parser.h> 28 #include <linux/smp_lock.h> 29 #include <linux/buffer_head.h> 30 #include <linux/exportfs.h> 31 #include <linux/vfs.h> 32 #include <linux/random.h> 33 #include <linux/mount.h> 34 #include <linux/namei.h> 35 #include <linux/quotaops.h> 36 #include <linux/seq_file.h> 37 #include <linux/log2.h> 38 #include <linux/crc16.h> 39 #include <asm/uaccess.h> 40 41 #include "ext4.h" 42 #include "ext4_jbd2.h" 43 #include "xattr.h" 44 #include "acl.h" 45 #include "namei.h" 46 #include "group.h" 47 48 static int ext4_load_journal(struct super_block *, struct ext4_super_block *, 49 unsigned long journal_devnum); 50 static int ext4_create_journal(struct super_block *, struct ext4_super_block *, 51 unsigned int); 52 static void ext4_commit_super (struct super_block * sb, 53 struct ext4_super_block * es, 54 int sync); 55 static void ext4_mark_recovery_complete(struct super_block * sb, 56 struct ext4_super_block * es); 57 static void ext4_clear_journal_err(struct super_block * sb, 58 struct ext4_super_block * es); 59 static int ext4_sync_fs(struct super_block *sb, int wait); 60 static const char *ext4_decode_error(struct super_block * sb, int errno, 61 char nbuf[16]); 62 static int ext4_remount (struct super_block * sb, int * flags, char * data); 63 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf); 64 static void ext4_unlockfs(struct super_block *sb); 65 static void ext4_write_super (struct super_block * sb); 66 static void ext4_write_super_lockfs(struct super_block *sb); 67 68 69 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 70 struct ext4_group_desc *bg) 71 { 72 return le32_to_cpu(bg->bg_block_bitmap_lo) | 73 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 74 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); 75 } 76 77 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 78 struct ext4_group_desc *bg) 79 { 80 return le32_to_cpu(bg->bg_inode_bitmap_lo) | 81 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 82 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); 83 } 84 85 ext4_fsblk_t ext4_inode_table(struct super_block *sb, 86 struct ext4_group_desc *bg) 87 { 88 return le32_to_cpu(bg->bg_inode_table_lo) | 89 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 90 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); 91 } 92 93 void ext4_block_bitmap_set(struct super_block *sb, 94 struct ext4_group_desc *bg, ext4_fsblk_t blk) 95 { 96 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); 97 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 98 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); 99 } 100 101 void ext4_inode_bitmap_set(struct super_block *sb, 102 struct ext4_group_desc *bg, ext4_fsblk_t blk) 103 { 104 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); 105 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 106 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); 107 } 108 109 void ext4_inode_table_set(struct super_block *sb, 110 struct ext4_group_desc *bg, ext4_fsblk_t blk) 111 { 112 bg->bg_inode_table_lo = cpu_to_le32((u32)blk); 113 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 114 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); 115 } 116 117 /* 118 * Wrappers for jbd2_journal_start/end. 119 * 120 * The only special thing we need to do here is to make sure that all 121 * journal_end calls result in the superblock being marked dirty, so 122 * that sync() will call the filesystem's write_super callback if 123 * appropriate. 124 */ 125 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) 126 { 127 journal_t *journal; 128 129 if (sb->s_flags & MS_RDONLY) 130 return ERR_PTR(-EROFS); 131 132 /* Special case here: if the journal has aborted behind our 133 * backs (eg. EIO in the commit thread), then we still need to 134 * take the FS itself readonly cleanly. */ 135 journal = EXT4_SB(sb)->s_journal; 136 if (is_journal_aborted(journal)) { 137 ext4_abort(sb, __func__, 138 "Detected aborted journal"); 139 return ERR_PTR(-EROFS); 140 } 141 142 return jbd2_journal_start(journal, nblocks); 143 } 144 145 /* 146 * The only special thing we need to do here is to make sure that all 147 * jbd2_journal_stop calls result in the superblock being marked dirty, so 148 * that sync() will call the filesystem's write_super callback if 149 * appropriate. 150 */ 151 int __ext4_journal_stop(const char *where, handle_t *handle) 152 { 153 struct super_block *sb; 154 int err; 155 int rc; 156 157 sb = handle->h_transaction->t_journal->j_private; 158 err = handle->h_err; 159 rc = jbd2_journal_stop(handle); 160 161 if (!err) 162 err = rc; 163 if (err) 164 __ext4_std_error(sb, where, err); 165 return err; 166 } 167 168 void ext4_journal_abort_handle(const char *caller, const char *err_fn, 169 struct buffer_head *bh, handle_t *handle, int err) 170 { 171 char nbuf[16]; 172 const char *errstr = ext4_decode_error(NULL, err, nbuf); 173 174 if (bh) 175 BUFFER_TRACE(bh, "abort"); 176 177 if (!handle->h_err) 178 handle->h_err = err; 179 180 if (is_handle_aborted(handle)) 181 return; 182 183 printk(KERN_ERR "%s: aborting transaction: %s in %s\n", 184 caller, errstr, err_fn); 185 186 jbd2_journal_abort_handle(handle); 187 } 188 189 /* Deal with the reporting of failure conditions on a filesystem such as 190 * inconsistencies detected or read IO failures. 191 * 192 * On ext2, we can store the error state of the filesystem in the 193 * superblock. That is not possible on ext4, because we may have other 194 * write ordering constraints on the superblock which prevent us from 195 * writing it out straight away; and given that the journal is about to 196 * be aborted, we can't rely on the current, or future, transactions to 197 * write out the superblock safely. 198 * 199 * We'll just use the jbd2_journal_abort() error code to record an error in 200 * the journal instead. On recovery, the journal will compain about 201 * that error until we've noted it down and cleared it. 202 */ 203 204 static void ext4_handle_error(struct super_block *sb) 205 { 206 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 207 208 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 209 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 210 211 if (sb->s_flags & MS_RDONLY) 212 return; 213 214 if (!test_opt (sb, ERRORS_CONT)) { 215 journal_t *journal = EXT4_SB(sb)->s_journal; 216 217 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; 218 if (journal) 219 jbd2_journal_abort(journal, -EIO); 220 } 221 if (test_opt (sb, ERRORS_RO)) { 222 printk (KERN_CRIT "Remounting filesystem read-only\n"); 223 sb->s_flags |= MS_RDONLY; 224 } 225 ext4_commit_super(sb, es, 1); 226 if (test_opt(sb, ERRORS_PANIC)) 227 panic("EXT4-fs (device %s): panic forced after error\n", 228 sb->s_id); 229 } 230 231 void ext4_error (struct super_block * sb, const char * function, 232 const char * fmt, ...) 233 { 234 va_list args; 235 236 va_start(args, fmt); 237 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function); 238 vprintk(fmt, args); 239 printk("\n"); 240 va_end(args); 241 242 ext4_handle_error(sb); 243 } 244 245 static const char *ext4_decode_error(struct super_block * sb, int errno, 246 char nbuf[16]) 247 { 248 char *errstr = NULL; 249 250 switch (errno) { 251 case -EIO: 252 errstr = "IO failure"; 253 break; 254 case -ENOMEM: 255 errstr = "Out of memory"; 256 break; 257 case -EROFS: 258 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT) 259 errstr = "Journal has aborted"; 260 else 261 errstr = "Readonly filesystem"; 262 break; 263 default: 264 /* If the caller passed in an extra buffer for unknown 265 * errors, textualise them now. Else we just return 266 * NULL. */ 267 if (nbuf) { 268 /* Check for truncated error codes... */ 269 if (snprintf(nbuf, 16, "error %d", -errno) >= 0) 270 errstr = nbuf; 271 } 272 break; 273 } 274 275 return errstr; 276 } 277 278 /* __ext4_std_error decodes expected errors from journaling functions 279 * automatically and invokes the appropriate error response. */ 280 281 void __ext4_std_error (struct super_block * sb, const char * function, 282 int errno) 283 { 284 char nbuf[16]; 285 const char *errstr; 286 287 /* Special case: if the error is EROFS, and we're not already 288 * inside a transaction, then there's really no point in logging 289 * an error. */ 290 if (errno == -EROFS && journal_current_handle() == NULL && 291 (sb->s_flags & MS_RDONLY)) 292 return; 293 294 errstr = ext4_decode_error(sb, errno, nbuf); 295 printk (KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n", 296 sb->s_id, function, errstr); 297 298 ext4_handle_error(sb); 299 } 300 301 /* 302 * ext4_abort is a much stronger failure handler than ext4_error. The 303 * abort function may be used to deal with unrecoverable failures such 304 * as journal IO errors or ENOMEM at a critical moment in log management. 305 * 306 * We unconditionally force the filesystem into an ABORT|READONLY state, 307 * unless the error response on the fs has been set to panic in which 308 * case we take the easy way out and panic immediately. 309 */ 310 311 void ext4_abort (struct super_block * sb, const char * function, 312 const char * fmt, ...) 313 { 314 va_list args; 315 316 printk (KERN_CRIT "ext4_abort called.\n"); 317 318 va_start(args, fmt); 319 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function); 320 vprintk(fmt, args); 321 printk("\n"); 322 va_end(args); 323 324 if (test_opt(sb, ERRORS_PANIC)) 325 panic("EXT4-fs panic from previous error\n"); 326 327 if (sb->s_flags & MS_RDONLY) 328 return; 329 330 printk(KERN_CRIT "Remounting filesystem read-only\n"); 331 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 332 sb->s_flags |= MS_RDONLY; 333 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; 334 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); 335 } 336 337 void ext4_warning (struct super_block * sb, const char * function, 338 const char * fmt, ...) 339 { 340 va_list args; 341 342 va_start(args, fmt); 343 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ", 344 sb->s_id, function); 345 vprintk(fmt, args); 346 printk("\n"); 347 va_end(args); 348 } 349 350 void ext4_update_dynamic_rev(struct super_block *sb) 351 { 352 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 353 354 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) 355 return; 356 357 ext4_warning(sb, __func__, 358 "updating to rev %d because of new feature flag, " 359 "running e2fsck is recommended", 360 EXT4_DYNAMIC_REV); 361 362 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); 363 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); 364 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); 365 /* leave es->s_feature_*compat flags alone */ 366 /* es->s_uuid will be set by e2fsck if empty */ 367 368 /* 369 * The rest of the superblock fields should be zero, and if not it 370 * means they are likely already in use, so leave them alone. We 371 * can leave it up to e2fsck to clean up any inconsistencies there. 372 */ 373 } 374 375 int ext4_update_compat_feature(handle_t *handle, 376 struct super_block *sb, __u32 compat) 377 { 378 int err = 0; 379 if (!EXT4_HAS_COMPAT_FEATURE(sb, compat)) { 380 err = ext4_journal_get_write_access(handle, 381 EXT4_SB(sb)->s_sbh); 382 if (err) 383 return err; 384 EXT4_SET_COMPAT_FEATURE(sb, compat); 385 sb->s_dirt = 1; 386 handle->h_sync = 1; 387 BUFFER_TRACE(EXT4_SB(sb)->s_sbh, 388 "call ext4_journal_dirty_met adata"); 389 err = ext4_journal_dirty_metadata(handle, 390 EXT4_SB(sb)->s_sbh); 391 } 392 return err; 393 } 394 395 int ext4_update_rocompat_feature(handle_t *handle, 396 struct super_block *sb, __u32 rocompat) 397 { 398 int err = 0; 399 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, rocompat)) { 400 err = ext4_journal_get_write_access(handle, 401 EXT4_SB(sb)->s_sbh); 402 if (err) 403 return err; 404 EXT4_SET_RO_COMPAT_FEATURE(sb, rocompat); 405 sb->s_dirt = 1; 406 handle->h_sync = 1; 407 BUFFER_TRACE(EXT4_SB(sb)->s_sbh, 408 "call ext4_journal_dirty_met adata"); 409 err = ext4_journal_dirty_metadata(handle, 410 EXT4_SB(sb)->s_sbh); 411 } 412 return err; 413 } 414 415 int ext4_update_incompat_feature(handle_t *handle, 416 struct super_block *sb, __u32 incompat) 417 { 418 int err = 0; 419 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, incompat)) { 420 err = ext4_journal_get_write_access(handle, 421 EXT4_SB(sb)->s_sbh); 422 if (err) 423 return err; 424 EXT4_SET_INCOMPAT_FEATURE(sb, incompat); 425 sb->s_dirt = 1; 426 handle->h_sync = 1; 427 BUFFER_TRACE(EXT4_SB(sb)->s_sbh, 428 "call ext4_journal_dirty_met adata"); 429 err = ext4_journal_dirty_metadata(handle, 430 EXT4_SB(sb)->s_sbh); 431 } 432 return err; 433 } 434 435 /* 436 * Open the external journal device 437 */ 438 static struct block_device *ext4_blkdev_get(dev_t dev) 439 { 440 struct block_device *bdev; 441 char b[BDEVNAME_SIZE]; 442 443 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); 444 if (IS_ERR(bdev)) 445 goto fail; 446 return bdev; 447 448 fail: 449 printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n", 450 __bdevname(dev, b), PTR_ERR(bdev)); 451 return NULL; 452 } 453 454 /* 455 * Release the journal device 456 */ 457 static int ext4_blkdev_put(struct block_device *bdev) 458 { 459 bd_release(bdev); 460 return blkdev_put(bdev); 461 } 462 463 static int ext4_blkdev_remove(struct ext4_sb_info *sbi) 464 { 465 struct block_device *bdev; 466 int ret = -ENODEV; 467 468 bdev = sbi->journal_bdev; 469 if (bdev) { 470 ret = ext4_blkdev_put(bdev); 471 sbi->journal_bdev = NULL; 472 } 473 return ret; 474 } 475 476 static inline struct inode *orphan_list_entry(struct list_head *l) 477 { 478 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; 479 } 480 481 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) 482 { 483 struct list_head *l; 484 485 printk(KERN_ERR "sb orphan head is %d\n", 486 le32_to_cpu(sbi->s_es->s_last_orphan)); 487 488 printk(KERN_ERR "sb_info orphan list:\n"); 489 list_for_each(l, &sbi->s_orphan) { 490 struct inode *inode = orphan_list_entry(l); 491 printk(KERN_ERR " " 492 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", 493 inode->i_sb->s_id, inode->i_ino, inode, 494 inode->i_mode, inode->i_nlink, 495 NEXT_ORPHAN(inode)); 496 } 497 } 498 499 static void ext4_put_super (struct super_block * sb) 500 { 501 struct ext4_sb_info *sbi = EXT4_SB(sb); 502 struct ext4_super_block *es = sbi->s_es; 503 int i; 504 505 ext4_mb_release(sb); 506 ext4_ext_release(sb); 507 ext4_xattr_put_super(sb); 508 jbd2_journal_destroy(sbi->s_journal); 509 if (!(sb->s_flags & MS_RDONLY)) { 510 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 511 es->s_state = cpu_to_le16(sbi->s_mount_state); 512 BUFFER_TRACE(sbi->s_sbh, "marking dirty"); 513 mark_buffer_dirty(sbi->s_sbh); 514 ext4_commit_super(sb, es, 1); 515 } 516 517 for (i = 0; i < sbi->s_gdb_count; i++) 518 brelse(sbi->s_group_desc[i]); 519 kfree(sbi->s_group_desc); 520 percpu_counter_destroy(&sbi->s_freeblocks_counter); 521 percpu_counter_destroy(&sbi->s_freeinodes_counter); 522 percpu_counter_destroy(&sbi->s_dirs_counter); 523 brelse(sbi->s_sbh); 524 #ifdef CONFIG_QUOTA 525 for (i = 0; i < MAXQUOTAS; i++) 526 kfree(sbi->s_qf_names[i]); 527 #endif 528 529 /* Debugging code just in case the in-memory inode orphan list 530 * isn't empty. The on-disk one can be non-empty if we've 531 * detected an error and taken the fs readonly, but the 532 * in-memory list had better be clean by this point. */ 533 if (!list_empty(&sbi->s_orphan)) 534 dump_orphan_list(sb, sbi); 535 J_ASSERT(list_empty(&sbi->s_orphan)); 536 537 invalidate_bdev(sb->s_bdev); 538 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { 539 /* 540 * Invalidate the journal device's buffers. We don't want them 541 * floating about in memory - the physical journal device may 542 * hotswapped, and it breaks the `ro-after' testing code. 543 */ 544 sync_blockdev(sbi->journal_bdev); 545 invalidate_bdev(sbi->journal_bdev); 546 ext4_blkdev_remove(sbi); 547 } 548 sb->s_fs_info = NULL; 549 kfree(sbi); 550 return; 551 } 552 553 static struct kmem_cache *ext4_inode_cachep; 554 555 /* 556 * Called inside transaction, so use GFP_NOFS 557 */ 558 static struct inode *ext4_alloc_inode(struct super_block *sb) 559 { 560 struct ext4_inode_info *ei; 561 562 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); 563 if (!ei) 564 return NULL; 565 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 566 ei->i_acl = EXT4_ACL_NOT_CACHED; 567 ei->i_default_acl = EXT4_ACL_NOT_CACHED; 568 #endif 569 ei->i_block_alloc_info = NULL; 570 ei->vfs_inode.i_version = 1; 571 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); 572 INIT_LIST_HEAD(&ei->i_prealloc_list); 573 spin_lock_init(&ei->i_prealloc_lock); 574 return &ei->vfs_inode; 575 } 576 577 static void ext4_destroy_inode(struct inode *inode) 578 { 579 if (!list_empty(&(EXT4_I(inode)->i_orphan))) { 580 printk("EXT4 Inode %p: orphan list check failed!\n", 581 EXT4_I(inode)); 582 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, 583 EXT4_I(inode), sizeof(struct ext4_inode_info), 584 true); 585 dump_stack(); 586 } 587 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); 588 } 589 590 static void init_once(struct kmem_cache *cachep, void *foo) 591 { 592 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; 593 594 INIT_LIST_HEAD(&ei->i_orphan); 595 #ifdef CONFIG_EXT4DEV_FS_XATTR 596 init_rwsem(&ei->xattr_sem); 597 #endif 598 init_rwsem(&ei->i_data_sem); 599 inode_init_once(&ei->vfs_inode); 600 } 601 602 static int init_inodecache(void) 603 { 604 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", 605 sizeof(struct ext4_inode_info), 606 0, (SLAB_RECLAIM_ACCOUNT| 607 SLAB_MEM_SPREAD), 608 init_once); 609 if (ext4_inode_cachep == NULL) 610 return -ENOMEM; 611 return 0; 612 } 613 614 static void destroy_inodecache(void) 615 { 616 kmem_cache_destroy(ext4_inode_cachep); 617 } 618 619 static void ext4_clear_inode(struct inode *inode) 620 { 621 struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info; 622 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 623 if (EXT4_I(inode)->i_acl && 624 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) { 625 posix_acl_release(EXT4_I(inode)->i_acl); 626 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED; 627 } 628 if (EXT4_I(inode)->i_default_acl && 629 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) { 630 posix_acl_release(EXT4_I(inode)->i_default_acl); 631 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED; 632 } 633 #endif 634 ext4_discard_reservation(inode); 635 EXT4_I(inode)->i_block_alloc_info = NULL; 636 if (unlikely(rsv)) 637 kfree(rsv); 638 } 639 640 static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb) 641 { 642 #if defined(CONFIG_QUOTA) 643 struct ext4_sb_info *sbi = EXT4_SB(sb); 644 645 if (sbi->s_jquota_fmt) 646 seq_printf(seq, ",jqfmt=%s", 647 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0"); 648 649 if (sbi->s_qf_names[USRQUOTA]) 650 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); 651 652 if (sbi->s_qf_names[GRPQUOTA]) 653 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); 654 655 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) 656 seq_puts(seq, ",usrquota"); 657 658 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) 659 seq_puts(seq, ",grpquota"); 660 #endif 661 } 662 663 /* 664 * Show an option if 665 * - it's set to a non-default value OR 666 * - if the per-sb default is different from the global default 667 */ 668 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs) 669 { 670 int def_errors; 671 unsigned long def_mount_opts; 672 struct super_block *sb = vfs->mnt_sb; 673 struct ext4_sb_info *sbi = EXT4_SB(sb); 674 struct ext4_super_block *es = sbi->s_es; 675 676 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 677 def_errors = le16_to_cpu(es->s_errors); 678 679 if (sbi->s_sb_block != 1) 680 seq_printf(seq, ",sb=%llu", sbi->s_sb_block); 681 if (test_opt(sb, MINIX_DF)) 682 seq_puts(seq, ",minixdf"); 683 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS)) 684 seq_puts(seq, ",grpid"); 685 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS)) 686 seq_puts(seq, ",nogrpid"); 687 if (sbi->s_resuid != EXT4_DEF_RESUID || 688 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) { 689 seq_printf(seq, ",resuid=%u", sbi->s_resuid); 690 } 691 if (sbi->s_resgid != EXT4_DEF_RESGID || 692 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) { 693 seq_printf(seq, ",resgid=%u", sbi->s_resgid); 694 } 695 if (test_opt(sb, ERRORS_RO)) { 696 if (def_errors == EXT4_ERRORS_PANIC || 697 def_errors == EXT4_ERRORS_CONTINUE) { 698 seq_puts(seq, ",errors=remount-ro"); 699 } 700 } 701 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) 702 seq_puts(seq, ",errors=continue"); 703 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) 704 seq_puts(seq, ",errors=panic"); 705 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16)) 706 seq_puts(seq, ",nouid32"); 707 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG)) 708 seq_puts(seq, ",debug"); 709 if (test_opt(sb, OLDALLOC)) 710 seq_puts(seq, ",oldalloc"); 711 #ifdef CONFIG_EXT4DEV_FS_XATTR 712 if (test_opt(sb, XATTR_USER) && 713 !(def_mount_opts & EXT4_DEFM_XATTR_USER)) 714 seq_puts(seq, ",user_xattr"); 715 if (!test_opt(sb, XATTR_USER) && 716 (def_mount_opts & EXT4_DEFM_XATTR_USER)) { 717 seq_puts(seq, ",nouser_xattr"); 718 } 719 #endif 720 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 721 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL)) 722 seq_puts(seq, ",acl"); 723 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL)) 724 seq_puts(seq, ",noacl"); 725 #endif 726 if (!test_opt(sb, RESERVATION)) 727 seq_puts(seq, ",noreservation"); 728 if (sbi->s_commit_interval) { 729 seq_printf(seq, ",commit=%u", 730 (unsigned) (sbi->s_commit_interval / HZ)); 731 } 732 if (test_opt(sb, BARRIER)) 733 seq_puts(seq, ",barrier=1"); 734 if (test_opt(sb, NOBH)) 735 seq_puts(seq, ",nobh"); 736 if (!test_opt(sb, EXTENTS)) 737 seq_puts(seq, ",noextents"); 738 if (!test_opt(sb, MBALLOC)) 739 seq_puts(seq, ",nomballoc"); 740 if (test_opt(sb, I_VERSION)) 741 seq_puts(seq, ",i_version"); 742 743 if (sbi->s_stripe) 744 seq_printf(seq, ",stripe=%lu", sbi->s_stripe); 745 /* 746 * journal mode get enabled in different ways 747 * So just print the value even if we didn't specify it 748 */ 749 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 750 seq_puts(seq, ",data=journal"); 751 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 752 seq_puts(seq, ",data=ordered"); 753 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) 754 seq_puts(seq, ",data=writeback"); 755 756 ext4_show_quota_options(seq, sb); 757 return 0; 758 } 759 760 761 static struct inode *ext4_nfs_get_inode(struct super_block *sb, 762 u64 ino, u32 generation) 763 { 764 struct inode *inode; 765 766 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) 767 return ERR_PTR(-ESTALE); 768 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) 769 return ERR_PTR(-ESTALE); 770 771 /* iget isn't really right if the inode is currently unallocated!! 772 * 773 * ext4_read_inode will return a bad_inode if the inode had been 774 * deleted, so we should be safe. 775 * 776 * Currently we don't know the generation for parent directory, so 777 * a generation of 0 means "accept any" 778 */ 779 inode = ext4_iget(sb, ino); 780 if (IS_ERR(inode)) 781 return ERR_CAST(inode); 782 if (generation && inode->i_generation != generation) { 783 iput(inode); 784 return ERR_PTR(-ESTALE); 785 } 786 787 return inode; 788 } 789 790 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, 791 int fh_len, int fh_type) 792 { 793 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 794 ext4_nfs_get_inode); 795 } 796 797 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, 798 int fh_len, int fh_type) 799 { 800 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 801 ext4_nfs_get_inode); 802 } 803 804 #ifdef CONFIG_QUOTA 805 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group") 806 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) 807 808 static int ext4_dquot_initialize(struct inode *inode, int type); 809 static int ext4_dquot_drop(struct inode *inode); 810 static int ext4_write_dquot(struct dquot *dquot); 811 static int ext4_acquire_dquot(struct dquot *dquot); 812 static int ext4_release_dquot(struct dquot *dquot); 813 static int ext4_mark_dquot_dirty(struct dquot *dquot); 814 static int ext4_write_info(struct super_block *sb, int type); 815 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 816 char *path, int remount); 817 static int ext4_quota_on_mount(struct super_block *sb, int type); 818 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 819 size_t len, loff_t off); 820 static ssize_t ext4_quota_write(struct super_block *sb, int type, 821 const char *data, size_t len, loff_t off); 822 823 static struct dquot_operations ext4_quota_operations = { 824 .initialize = ext4_dquot_initialize, 825 .drop = ext4_dquot_drop, 826 .alloc_space = dquot_alloc_space, 827 .alloc_inode = dquot_alloc_inode, 828 .free_space = dquot_free_space, 829 .free_inode = dquot_free_inode, 830 .transfer = dquot_transfer, 831 .write_dquot = ext4_write_dquot, 832 .acquire_dquot = ext4_acquire_dquot, 833 .release_dquot = ext4_release_dquot, 834 .mark_dirty = ext4_mark_dquot_dirty, 835 .write_info = ext4_write_info 836 }; 837 838 static struct quotactl_ops ext4_qctl_operations = { 839 .quota_on = ext4_quota_on, 840 .quota_off = vfs_quota_off, 841 .quota_sync = vfs_quota_sync, 842 .get_info = vfs_get_dqinfo, 843 .set_info = vfs_set_dqinfo, 844 .get_dqblk = vfs_get_dqblk, 845 .set_dqblk = vfs_set_dqblk 846 }; 847 #endif 848 849 static const struct super_operations ext4_sops = { 850 .alloc_inode = ext4_alloc_inode, 851 .destroy_inode = ext4_destroy_inode, 852 .write_inode = ext4_write_inode, 853 .dirty_inode = ext4_dirty_inode, 854 .delete_inode = ext4_delete_inode, 855 .put_super = ext4_put_super, 856 .write_super = ext4_write_super, 857 .sync_fs = ext4_sync_fs, 858 .write_super_lockfs = ext4_write_super_lockfs, 859 .unlockfs = ext4_unlockfs, 860 .statfs = ext4_statfs, 861 .remount_fs = ext4_remount, 862 .clear_inode = ext4_clear_inode, 863 .show_options = ext4_show_options, 864 #ifdef CONFIG_QUOTA 865 .quota_read = ext4_quota_read, 866 .quota_write = ext4_quota_write, 867 #endif 868 }; 869 870 static const struct export_operations ext4_export_ops = { 871 .fh_to_dentry = ext4_fh_to_dentry, 872 .fh_to_parent = ext4_fh_to_parent, 873 .get_parent = ext4_get_parent, 874 }; 875 876 enum { 877 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 878 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, 879 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov, 880 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, 881 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh, 882 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev, 883 Opt_journal_checksum, Opt_journal_async_commit, 884 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, 885 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, 886 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota, 887 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota, 888 Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version, 889 Opt_mballoc, Opt_nomballoc, Opt_stripe, 890 }; 891 892 static match_table_t tokens = { 893 {Opt_bsd_df, "bsddf"}, 894 {Opt_minix_df, "minixdf"}, 895 {Opt_grpid, "grpid"}, 896 {Opt_grpid, "bsdgroups"}, 897 {Opt_nogrpid, "nogrpid"}, 898 {Opt_nogrpid, "sysvgroups"}, 899 {Opt_resgid, "resgid=%u"}, 900 {Opt_resuid, "resuid=%u"}, 901 {Opt_sb, "sb=%u"}, 902 {Opt_err_cont, "errors=continue"}, 903 {Opt_err_panic, "errors=panic"}, 904 {Opt_err_ro, "errors=remount-ro"}, 905 {Opt_nouid32, "nouid32"}, 906 {Opt_nocheck, "nocheck"}, 907 {Opt_nocheck, "check=none"}, 908 {Opt_debug, "debug"}, 909 {Opt_oldalloc, "oldalloc"}, 910 {Opt_orlov, "orlov"}, 911 {Opt_user_xattr, "user_xattr"}, 912 {Opt_nouser_xattr, "nouser_xattr"}, 913 {Opt_acl, "acl"}, 914 {Opt_noacl, "noacl"}, 915 {Opt_reservation, "reservation"}, 916 {Opt_noreservation, "noreservation"}, 917 {Opt_noload, "noload"}, 918 {Opt_nobh, "nobh"}, 919 {Opt_bh, "bh"}, 920 {Opt_commit, "commit=%u"}, 921 {Opt_journal_update, "journal=update"}, 922 {Opt_journal_inum, "journal=%u"}, 923 {Opt_journal_dev, "journal_dev=%u"}, 924 {Opt_journal_checksum, "journal_checksum"}, 925 {Opt_journal_async_commit, "journal_async_commit"}, 926 {Opt_abort, "abort"}, 927 {Opt_data_journal, "data=journal"}, 928 {Opt_data_ordered, "data=ordered"}, 929 {Opt_data_writeback, "data=writeback"}, 930 {Opt_offusrjquota, "usrjquota="}, 931 {Opt_usrjquota, "usrjquota=%s"}, 932 {Opt_offgrpjquota, "grpjquota="}, 933 {Opt_grpjquota, "grpjquota=%s"}, 934 {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, 935 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, 936 {Opt_grpquota, "grpquota"}, 937 {Opt_noquota, "noquota"}, 938 {Opt_quota, "quota"}, 939 {Opt_usrquota, "usrquota"}, 940 {Opt_barrier, "barrier=%u"}, 941 {Opt_extents, "extents"}, 942 {Opt_noextents, "noextents"}, 943 {Opt_i_version, "i_version"}, 944 {Opt_mballoc, "mballoc"}, 945 {Opt_nomballoc, "nomballoc"}, 946 {Opt_stripe, "stripe=%u"}, 947 {Opt_resize, "resize"}, 948 {Opt_err, NULL}, 949 }; 950 951 static ext4_fsblk_t get_sb_block(void **data) 952 { 953 ext4_fsblk_t sb_block; 954 char *options = (char *) *data; 955 956 if (!options || strncmp(options, "sb=", 3) != 0) 957 return 1; /* Default location */ 958 options += 3; 959 /*todo: use simple_strtoll with >32bit ext4 */ 960 sb_block = simple_strtoul(options, &options, 0); 961 if (*options && *options != ',') { 962 printk("EXT4-fs: Invalid sb specification: %s\n", 963 (char *) *data); 964 return 1; 965 } 966 if (*options == ',') 967 options++; 968 *data = (void *) options; 969 return sb_block; 970 } 971 972 static int parse_options (char *options, struct super_block *sb, 973 unsigned int *inum, unsigned long *journal_devnum, 974 ext4_fsblk_t *n_blocks_count, int is_remount) 975 { 976 struct ext4_sb_info *sbi = EXT4_SB(sb); 977 char * p; 978 substring_t args[MAX_OPT_ARGS]; 979 int data_opt = 0; 980 int option; 981 #ifdef CONFIG_QUOTA 982 int qtype; 983 char *qname; 984 #endif 985 986 if (!options) 987 return 1; 988 989 while ((p = strsep (&options, ",")) != NULL) { 990 int token; 991 if (!*p) 992 continue; 993 994 token = match_token(p, tokens, args); 995 switch (token) { 996 case Opt_bsd_df: 997 clear_opt (sbi->s_mount_opt, MINIX_DF); 998 break; 999 case Opt_minix_df: 1000 set_opt (sbi->s_mount_opt, MINIX_DF); 1001 break; 1002 case Opt_grpid: 1003 set_opt (sbi->s_mount_opt, GRPID); 1004 break; 1005 case Opt_nogrpid: 1006 clear_opt (sbi->s_mount_opt, GRPID); 1007 break; 1008 case Opt_resuid: 1009 if (match_int(&args[0], &option)) 1010 return 0; 1011 sbi->s_resuid = option; 1012 break; 1013 case Opt_resgid: 1014 if (match_int(&args[0], &option)) 1015 return 0; 1016 sbi->s_resgid = option; 1017 break; 1018 case Opt_sb: 1019 /* handled by get_sb_block() instead of here */ 1020 /* *sb_block = match_int(&args[0]); */ 1021 break; 1022 case Opt_err_panic: 1023 clear_opt (sbi->s_mount_opt, ERRORS_CONT); 1024 clear_opt (sbi->s_mount_opt, ERRORS_RO); 1025 set_opt (sbi->s_mount_opt, ERRORS_PANIC); 1026 break; 1027 case Opt_err_ro: 1028 clear_opt (sbi->s_mount_opt, ERRORS_CONT); 1029 clear_opt (sbi->s_mount_opt, ERRORS_PANIC); 1030 set_opt (sbi->s_mount_opt, ERRORS_RO); 1031 break; 1032 case Opt_err_cont: 1033 clear_opt (sbi->s_mount_opt, ERRORS_RO); 1034 clear_opt (sbi->s_mount_opt, ERRORS_PANIC); 1035 set_opt (sbi->s_mount_opt, ERRORS_CONT); 1036 break; 1037 case Opt_nouid32: 1038 set_opt (sbi->s_mount_opt, NO_UID32); 1039 break; 1040 case Opt_nocheck: 1041 clear_opt (sbi->s_mount_opt, CHECK); 1042 break; 1043 case Opt_debug: 1044 set_opt (sbi->s_mount_opt, DEBUG); 1045 break; 1046 case Opt_oldalloc: 1047 set_opt (sbi->s_mount_opt, OLDALLOC); 1048 break; 1049 case Opt_orlov: 1050 clear_opt (sbi->s_mount_opt, OLDALLOC); 1051 break; 1052 #ifdef CONFIG_EXT4DEV_FS_XATTR 1053 case Opt_user_xattr: 1054 set_opt (sbi->s_mount_opt, XATTR_USER); 1055 break; 1056 case Opt_nouser_xattr: 1057 clear_opt (sbi->s_mount_opt, XATTR_USER); 1058 break; 1059 #else 1060 case Opt_user_xattr: 1061 case Opt_nouser_xattr: 1062 printk("EXT4 (no)user_xattr options not supported\n"); 1063 break; 1064 #endif 1065 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 1066 case Opt_acl: 1067 set_opt(sbi->s_mount_opt, POSIX_ACL); 1068 break; 1069 case Opt_noacl: 1070 clear_opt(sbi->s_mount_opt, POSIX_ACL); 1071 break; 1072 #else 1073 case Opt_acl: 1074 case Opt_noacl: 1075 printk("EXT4 (no)acl options not supported\n"); 1076 break; 1077 #endif 1078 case Opt_reservation: 1079 set_opt(sbi->s_mount_opt, RESERVATION); 1080 break; 1081 case Opt_noreservation: 1082 clear_opt(sbi->s_mount_opt, RESERVATION); 1083 break; 1084 case Opt_journal_update: 1085 /* @@@ FIXME */ 1086 /* Eventually we will want to be able to create 1087 a journal file here. For now, only allow the 1088 user to specify an existing inode to be the 1089 journal file. */ 1090 if (is_remount) { 1091 printk(KERN_ERR "EXT4-fs: cannot specify " 1092 "journal on remount\n"); 1093 return 0; 1094 } 1095 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL); 1096 break; 1097 case Opt_journal_inum: 1098 if (is_remount) { 1099 printk(KERN_ERR "EXT4-fs: cannot specify " 1100 "journal on remount\n"); 1101 return 0; 1102 } 1103 if (match_int(&args[0], &option)) 1104 return 0; 1105 *inum = option; 1106 break; 1107 case Opt_journal_dev: 1108 if (is_remount) { 1109 printk(KERN_ERR "EXT4-fs: cannot specify " 1110 "journal on remount\n"); 1111 return 0; 1112 } 1113 if (match_int(&args[0], &option)) 1114 return 0; 1115 *journal_devnum = option; 1116 break; 1117 case Opt_journal_checksum: 1118 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); 1119 break; 1120 case Opt_journal_async_commit: 1121 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT); 1122 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); 1123 break; 1124 case Opt_noload: 1125 set_opt (sbi->s_mount_opt, NOLOAD); 1126 break; 1127 case Opt_commit: 1128 if (match_int(&args[0], &option)) 1129 return 0; 1130 if (option < 0) 1131 return 0; 1132 if (option == 0) 1133 option = JBD2_DEFAULT_MAX_COMMIT_AGE; 1134 sbi->s_commit_interval = HZ * option; 1135 break; 1136 case Opt_data_journal: 1137 data_opt = EXT4_MOUNT_JOURNAL_DATA; 1138 goto datacheck; 1139 case Opt_data_ordered: 1140 data_opt = EXT4_MOUNT_ORDERED_DATA; 1141 goto datacheck; 1142 case Opt_data_writeback: 1143 data_opt = EXT4_MOUNT_WRITEBACK_DATA; 1144 datacheck: 1145 if (is_remount) { 1146 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS) 1147 != data_opt) { 1148 printk(KERN_ERR 1149 "EXT4-fs: cannot change data " 1150 "mode on remount\n"); 1151 return 0; 1152 } 1153 } else { 1154 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS; 1155 sbi->s_mount_opt |= data_opt; 1156 } 1157 break; 1158 #ifdef CONFIG_QUOTA 1159 case Opt_usrjquota: 1160 qtype = USRQUOTA; 1161 goto set_qf_name; 1162 case Opt_grpjquota: 1163 qtype = GRPQUOTA; 1164 set_qf_name: 1165 if (sb_any_quota_enabled(sb)) { 1166 printk(KERN_ERR 1167 "EXT4-fs: Cannot change journalled " 1168 "quota options when quota turned on.\n"); 1169 return 0; 1170 } 1171 qname = match_strdup(&args[0]); 1172 if (!qname) { 1173 printk(KERN_ERR 1174 "EXT4-fs: not enough memory for " 1175 "storing quotafile name.\n"); 1176 return 0; 1177 } 1178 if (sbi->s_qf_names[qtype] && 1179 strcmp(sbi->s_qf_names[qtype], qname)) { 1180 printk(KERN_ERR 1181 "EXT4-fs: %s quota file already " 1182 "specified.\n", QTYPE2NAME(qtype)); 1183 kfree(qname); 1184 return 0; 1185 } 1186 sbi->s_qf_names[qtype] = qname; 1187 if (strchr(sbi->s_qf_names[qtype], '/')) { 1188 printk(KERN_ERR 1189 "EXT4-fs: quotafile must be on " 1190 "filesystem root.\n"); 1191 kfree(sbi->s_qf_names[qtype]); 1192 sbi->s_qf_names[qtype] = NULL; 1193 return 0; 1194 } 1195 set_opt(sbi->s_mount_opt, QUOTA); 1196 break; 1197 case Opt_offusrjquota: 1198 qtype = USRQUOTA; 1199 goto clear_qf_name; 1200 case Opt_offgrpjquota: 1201 qtype = GRPQUOTA; 1202 clear_qf_name: 1203 if (sb_any_quota_enabled(sb)) { 1204 printk(KERN_ERR "EXT4-fs: Cannot change " 1205 "journalled quota options when " 1206 "quota turned on.\n"); 1207 return 0; 1208 } 1209 /* 1210 * The space will be released later when all options 1211 * are confirmed to be correct 1212 */ 1213 sbi->s_qf_names[qtype] = NULL; 1214 break; 1215 case Opt_jqfmt_vfsold: 1216 sbi->s_jquota_fmt = QFMT_VFS_OLD; 1217 break; 1218 case Opt_jqfmt_vfsv0: 1219 sbi->s_jquota_fmt = QFMT_VFS_V0; 1220 break; 1221 case Opt_quota: 1222 case Opt_usrquota: 1223 set_opt(sbi->s_mount_opt, QUOTA); 1224 set_opt(sbi->s_mount_opt, USRQUOTA); 1225 break; 1226 case Opt_grpquota: 1227 set_opt(sbi->s_mount_opt, QUOTA); 1228 set_opt(sbi->s_mount_opt, GRPQUOTA); 1229 break; 1230 case Opt_noquota: 1231 if (sb_any_quota_enabled(sb)) { 1232 printk(KERN_ERR "EXT4-fs: Cannot change quota " 1233 "options when quota turned on.\n"); 1234 return 0; 1235 } 1236 clear_opt(sbi->s_mount_opt, QUOTA); 1237 clear_opt(sbi->s_mount_opt, USRQUOTA); 1238 clear_opt(sbi->s_mount_opt, GRPQUOTA); 1239 break; 1240 #else 1241 case Opt_quota: 1242 case Opt_usrquota: 1243 case Opt_grpquota: 1244 case Opt_usrjquota: 1245 case Opt_grpjquota: 1246 case Opt_offusrjquota: 1247 case Opt_offgrpjquota: 1248 case Opt_jqfmt_vfsold: 1249 case Opt_jqfmt_vfsv0: 1250 printk(KERN_ERR 1251 "EXT4-fs: journalled quota options not " 1252 "supported.\n"); 1253 break; 1254 case Opt_noquota: 1255 break; 1256 #endif 1257 case Opt_abort: 1258 set_opt(sbi->s_mount_opt, ABORT); 1259 break; 1260 case Opt_barrier: 1261 if (match_int(&args[0], &option)) 1262 return 0; 1263 if (option) 1264 set_opt(sbi->s_mount_opt, BARRIER); 1265 else 1266 clear_opt(sbi->s_mount_opt, BARRIER); 1267 break; 1268 case Opt_ignore: 1269 break; 1270 case Opt_resize: 1271 if (!is_remount) { 1272 printk("EXT4-fs: resize option only available " 1273 "for remount\n"); 1274 return 0; 1275 } 1276 if (match_int(&args[0], &option) != 0) 1277 return 0; 1278 *n_blocks_count = option; 1279 break; 1280 case Opt_nobh: 1281 set_opt(sbi->s_mount_opt, NOBH); 1282 break; 1283 case Opt_bh: 1284 clear_opt(sbi->s_mount_opt, NOBH); 1285 break; 1286 case Opt_extents: 1287 set_opt (sbi->s_mount_opt, EXTENTS); 1288 break; 1289 case Opt_noextents: 1290 clear_opt (sbi->s_mount_opt, EXTENTS); 1291 break; 1292 case Opt_i_version: 1293 set_opt(sbi->s_mount_opt, I_VERSION); 1294 sb->s_flags |= MS_I_VERSION; 1295 break; 1296 case Opt_mballoc: 1297 set_opt(sbi->s_mount_opt, MBALLOC); 1298 break; 1299 case Opt_nomballoc: 1300 clear_opt(sbi->s_mount_opt, MBALLOC); 1301 break; 1302 case Opt_stripe: 1303 if (match_int(&args[0], &option)) 1304 return 0; 1305 if (option < 0) 1306 return 0; 1307 sbi->s_stripe = option; 1308 break; 1309 default: 1310 printk (KERN_ERR 1311 "EXT4-fs: Unrecognized mount option \"%s\" " 1312 "or missing value\n", p); 1313 return 0; 1314 } 1315 } 1316 #ifdef CONFIG_QUOTA 1317 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { 1318 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) && 1319 sbi->s_qf_names[USRQUOTA]) 1320 clear_opt(sbi->s_mount_opt, USRQUOTA); 1321 1322 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) && 1323 sbi->s_qf_names[GRPQUOTA]) 1324 clear_opt(sbi->s_mount_opt, GRPQUOTA); 1325 1326 if ((sbi->s_qf_names[USRQUOTA] && 1327 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) || 1328 (sbi->s_qf_names[GRPQUOTA] && 1329 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) { 1330 printk(KERN_ERR "EXT4-fs: old and new quota " 1331 "format mixing.\n"); 1332 return 0; 1333 } 1334 1335 if (!sbi->s_jquota_fmt) { 1336 printk(KERN_ERR "EXT4-fs: journalled quota format " 1337 "not specified.\n"); 1338 return 0; 1339 } 1340 } else { 1341 if (sbi->s_jquota_fmt) { 1342 printk(KERN_ERR "EXT4-fs: journalled quota format " 1343 "specified with no journalling " 1344 "enabled.\n"); 1345 return 0; 1346 } 1347 } 1348 #endif 1349 return 1; 1350 } 1351 1352 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, 1353 int read_only) 1354 { 1355 struct ext4_sb_info *sbi = EXT4_SB(sb); 1356 int res = 0; 1357 1358 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { 1359 printk (KERN_ERR "EXT4-fs warning: revision level too high, " 1360 "forcing read-only mode\n"); 1361 res = MS_RDONLY; 1362 } 1363 if (read_only) 1364 return res; 1365 if (!(sbi->s_mount_state & EXT4_VALID_FS)) 1366 printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, " 1367 "running e2fsck is recommended\n"); 1368 else if ((sbi->s_mount_state & EXT4_ERROR_FS)) 1369 printk (KERN_WARNING 1370 "EXT4-fs warning: mounting fs with errors, " 1371 "running e2fsck is recommended\n"); 1372 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 1373 le16_to_cpu(es->s_mnt_count) >= 1374 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 1375 printk (KERN_WARNING 1376 "EXT4-fs warning: maximal mount count reached, " 1377 "running e2fsck is recommended\n"); 1378 else if (le32_to_cpu(es->s_checkinterval) && 1379 (le32_to_cpu(es->s_lastcheck) + 1380 le32_to_cpu(es->s_checkinterval) <= get_seconds())) 1381 printk (KERN_WARNING 1382 "EXT4-fs warning: checktime reached, " 1383 "running e2fsck is recommended\n"); 1384 #if 0 1385 /* @@@ We _will_ want to clear the valid bit if we find 1386 * inconsistencies, to force a fsck at reboot. But for 1387 * a plain journaled filesystem we can keep it set as 1388 * valid forever! :) 1389 */ 1390 es->s_state &= cpu_to_le16(~EXT4_VALID_FS); 1391 #endif 1392 if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) 1393 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); 1394 le16_add_cpu(&es->s_mnt_count, 1); 1395 es->s_mtime = cpu_to_le32(get_seconds()); 1396 ext4_update_dynamic_rev(sb); 1397 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 1398 1399 ext4_commit_super(sb, es, 1); 1400 if (test_opt(sb, DEBUG)) 1401 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, " 1402 "bpg=%lu, ipg=%lu, mo=%04lx]\n", 1403 sb->s_blocksize, 1404 sbi->s_groups_count, 1405 EXT4_BLOCKS_PER_GROUP(sb), 1406 EXT4_INODES_PER_GROUP(sb), 1407 sbi->s_mount_opt); 1408 1409 printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id); 1410 if (EXT4_SB(sb)->s_journal->j_inode == NULL) { 1411 char b[BDEVNAME_SIZE]; 1412 1413 printk("external journal on %s\n", 1414 bdevname(EXT4_SB(sb)->s_journal->j_dev, b)); 1415 } else { 1416 printk("internal journal\n"); 1417 } 1418 return res; 1419 } 1420 1421 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group, 1422 struct ext4_group_desc *gdp) 1423 { 1424 __u16 crc = 0; 1425 1426 if (sbi->s_es->s_feature_ro_compat & 1427 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { 1428 int offset = offsetof(struct ext4_group_desc, bg_checksum); 1429 __le32 le_group = cpu_to_le32(block_group); 1430 1431 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); 1432 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); 1433 crc = crc16(crc, (__u8 *)gdp, offset); 1434 offset += sizeof(gdp->bg_checksum); /* skip checksum */ 1435 /* for checksum of struct ext4_group_desc do the rest...*/ 1436 if ((sbi->s_es->s_feature_incompat & 1437 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) && 1438 offset < le16_to_cpu(sbi->s_es->s_desc_size)) 1439 crc = crc16(crc, (__u8 *)gdp + offset, 1440 le16_to_cpu(sbi->s_es->s_desc_size) - 1441 offset); 1442 } 1443 1444 return cpu_to_le16(crc); 1445 } 1446 1447 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group, 1448 struct ext4_group_desc *gdp) 1449 { 1450 if ((sbi->s_es->s_feature_ro_compat & 1451 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) && 1452 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp))) 1453 return 0; 1454 1455 return 1; 1456 } 1457 1458 /* Called at mount-time, super-block is locked */ 1459 static int ext4_check_descriptors(struct super_block *sb) 1460 { 1461 struct ext4_sb_info *sbi = EXT4_SB(sb); 1462 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); 1463 ext4_fsblk_t last_block; 1464 ext4_fsblk_t block_bitmap; 1465 ext4_fsblk_t inode_bitmap; 1466 ext4_fsblk_t inode_table; 1467 int flexbg_flag = 0; 1468 ext4_group_t i; 1469 1470 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 1471 flexbg_flag = 1; 1472 1473 ext4_debug ("Checking group descriptors"); 1474 1475 for (i = 0; i < sbi->s_groups_count; i++) { 1476 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); 1477 1478 if (i == sbi->s_groups_count - 1 || flexbg_flag) 1479 last_block = ext4_blocks_count(sbi->s_es) - 1; 1480 else 1481 last_block = first_block + 1482 (EXT4_BLOCKS_PER_GROUP(sb) - 1); 1483 1484 block_bitmap = ext4_block_bitmap(sb, gdp); 1485 if (block_bitmap < first_block || block_bitmap > last_block) 1486 { 1487 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " 1488 "Block bitmap for group %lu not in group " 1489 "(block %llu)!", i, block_bitmap); 1490 return 0; 1491 } 1492 inode_bitmap = ext4_inode_bitmap(sb, gdp); 1493 if (inode_bitmap < first_block || inode_bitmap > last_block) 1494 { 1495 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " 1496 "Inode bitmap for group %lu not in group " 1497 "(block %llu)!", i, inode_bitmap); 1498 return 0; 1499 } 1500 inode_table = ext4_inode_table(sb, gdp); 1501 if (inode_table < first_block || 1502 inode_table + sbi->s_itb_per_group - 1 > last_block) 1503 { 1504 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " 1505 "Inode table for group %lu not in group " 1506 "(block %llu)!", i, inode_table); 1507 return 0; 1508 } 1509 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) { 1510 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " 1511 "Checksum for group %lu failed (%u!=%u)\n", 1512 i, le16_to_cpu(ext4_group_desc_csum(sbi, i, 1513 gdp)), le16_to_cpu(gdp->bg_checksum)); 1514 return 0; 1515 } 1516 if (!flexbg_flag) 1517 first_block += EXT4_BLOCKS_PER_GROUP(sb); 1518 } 1519 1520 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb)); 1521 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb)); 1522 return 1; 1523 } 1524 1525 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at 1526 * the superblock) which were deleted from all directories, but held open by 1527 * a process at the time of a crash. We walk the list and try to delete these 1528 * inodes at recovery time (only with a read-write filesystem). 1529 * 1530 * In order to keep the orphan inode chain consistent during traversal (in 1531 * case of crash during recovery), we link each inode into the superblock 1532 * orphan list_head and handle it the same way as an inode deletion during 1533 * normal operation (which journals the operations for us). 1534 * 1535 * We only do an iget() and an iput() on each inode, which is very safe if we 1536 * accidentally point at an in-use or already deleted inode. The worst that 1537 * can happen in this case is that we get a "bit already cleared" message from 1538 * ext4_free_inode(). The only reason we would point at a wrong inode is if 1539 * e2fsck was run on this filesystem, and it must have already done the orphan 1540 * inode cleanup for us, so we can safely abort without any further action. 1541 */ 1542 static void ext4_orphan_cleanup (struct super_block * sb, 1543 struct ext4_super_block * es) 1544 { 1545 unsigned int s_flags = sb->s_flags; 1546 int nr_orphans = 0, nr_truncates = 0; 1547 #ifdef CONFIG_QUOTA 1548 int i; 1549 #endif 1550 if (!es->s_last_orphan) { 1551 jbd_debug(4, "no orphan inodes to clean up\n"); 1552 return; 1553 } 1554 1555 if (bdev_read_only(sb->s_bdev)) { 1556 printk(KERN_ERR "EXT4-fs: write access " 1557 "unavailable, skipping orphan cleanup.\n"); 1558 return; 1559 } 1560 1561 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { 1562 if (es->s_last_orphan) 1563 jbd_debug(1, "Errors on filesystem, " 1564 "clearing orphan list.\n"); 1565 es->s_last_orphan = 0; 1566 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); 1567 return; 1568 } 1569 1570 if (s_flags & MS_RDONLY) { 1571 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n", 1572 sb->s_id); 1573 sb->s_flags &= ~MS_RDONLY; 1574 } 1575 #ifdef CONFIG_QUOTA 1576 /* Needed for iput() to work correctly and not trash data */ 1577 sb->s_flags |= MS_ACTIVE; 1578 /* Turn on quotas so that they are updated correctly */ 1579 for (i = 0; i < MAXQUOTAS; i++) { 1580 if (EXT4_SB(sb)->s_qf_names[i]) { 1581 int ret = ext4_quota_on_mount(sb, i); 1582 if (ret < 0) 1583 printk(KERN_ERR 1584 "EXT4-fs: Cannot turn on journalled " 1585 "quota: error %d\n", ret); 1586 } 1587 } 1588 #endif 1589 1590 while (es->s_last_orphan) { 1591 struct inode *inode; 1592 1593 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); 1594 if (IS_ERR(inode)) { 1595 es->s_last_orphan = 0; 1596 break; 1597 } 1598 1599 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); 1600 DQUOT_INIT(inode); 1601 if (inode->i_nlink) { 1602 printk(KERN_DEBUG 1603 "%s: truncating inode %lu to %Ld bytes\n", 1604 __func__, inode->i_ino, inode->i_size); 1605 jbd_debug(2, "truncating inode %lu to %Ld bytes\n", 1606 inode->i_ino, inode->i_size); 1607 ext4_truncate(inode); 1608 nr_truncates++; 1609 } else { 1610 printk(KERN_DEBUG 1611 "%s: deleting unreferenced inode %lu\n", 1612 __func__, inode->i_ino); 1613 jbd_debug(2, "deleting unreferenced inode %lu\n", 1614 inode->i_ino); 1615 nr_orphans++; 1616 } 1617 iput(inode); /* The delete magic happens here! */ 1618 } 1619 1620 #define PLURAL(x) (x), ((x)==1) ? "" : "s" 1621 1622 if (nr_orphans) 1623 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n", 1624 sb->s_id, PLURAL(nr_orphans)); 1625 if (nr_truncates) 1626 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n", 1627 sb->s_id, PLURAL(nr_truncates)); 1628 #ifdef CONFIG_QUOTA 1629 /* Turn quotas off */ 1630 for (i = 0; i < MAXQUOTAS; i++) { 1631 if (sb_dqopt(sb)->files[i]) 1632 vfs_quota_off(sb, i, 0); 1633 } 1634 #endif 1635 sb->s_flags = s_flags; /* Restore MS_RDONLY status */ 1636 } 1637 /* 1638 * Maximal extent format file size. 1639 * Resulting logical blkno at s_maxbytes must fit in our on-disk 1640 * extent format containers, within a sector_t, and within i_blocks 1641 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, 1642 * so that won't be a limiting factor. 1643 * 1644 * Note, this does *not* consider any metadata overhead for vfs i_blocks. 1645 */ 1646 static loff_t ext4_max_size(int blkbits) 1647 { 1648 loff_t res; 1649 loff_t upper_limit = MAX_LFS_FILESIZE; 1650 1651 /* small i_blocks in vfs inode? */ 1652 if (sizeof(blkcnt_t) < sizeof(u64)) { 1653 /* 1654 * CONFIG_LSF is not enabled implies the inode 1655 * i_block represent total blocks in 512 bytes 1656 * 32 == size of vfs inode i_blocks * 8 1657 */ 1658 upper_limit = (1LL << 32) - 1; 1659 1660 /* total blocks in file system block size */ 1661 upper_limit >>= (blkbits - 9); 1662 upper_limit <<= blkbits; 1663 } 1664 1665 /* 32-bit extent-start container, ee_block */ 1666 res = 1LL << 32; 1667 res <<= blkbits; 1668 res -= 1; 1669 1670 /* Sanity check against vm- & vfs- imposed limits */ 1671 if (res > upper_limit) 1672 res = upper_limit; 1673 1674 return res; 1675 } 1676 1677 /* 1678 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect 1679 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. 1680 * We need to be 1 filesystem block less than the 2^48 sector limit. 1681 */ 1682 static loff_t ext4_max_bitmap_size(int bits) 1683 { 1684 loff_t res = EXT4_NDIR_BLOCKS; 1685 int meta_blocks; 1686 loff_t upper_limit; 1687 /* This is calculated to be the largest file size for a 1688 * dense, bitmapped file such that the total number of 1689 * sectors in the file, including data and all indirect blocks, 1690 * does not exceed 2^48 -1 1691 * __u32 i_blocks_lo and _u16 i_blocks_high representing the 1692 * total number of 512 bytes blocks of the file 1693 */ 1694 1695 if (sizeof(blkcnt_t) < sizeof(u64)) { 1696 /* 1697 * CONFIG_LSF is not enabled implies the inode 1698 * i_block represent total blocks in 512 bytes 1699 * 32 == size of vfs inode i_blocks * 8 1700 */ 1701 upper_limit = (1LL << 32) - 1; 1702 1703 /* total blocks in file system block size */ 1704 upper_limit >>= (bits - 9); 1705 1706 } else { 1707 /* 1708 * We use 48 bit ext4_inode i_blocks 1709 * With EXT4_HUGE_FILE_FL set the i_blocks 1710 * represent total number of blocks in 1711 * file system block size 1712 */ 1713 upper_limit = (1LL << 48) - 1; 1714 1715 } 1716 1717 /* indirect blocks */ 1718 meta_blocks = 1; 1719 /* double indirect blocks */ 1720 meta_blocks += 1 + (1LL << (bits-2)); 1721 /* tripple indirect blocks */ 1722 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); 1723 1724 upper_limit -= meta_blocks; 1725 upper_limit <<= bits; 1726 1727 res += 1LL << (bits-2); 1728 res += 1LL << (2*(bits-2)); 1729 res += 1LL << (3*(bits-2)); 1730 res <<= bits; 1731 if (res > upper_limit) 1732 res = upper_limit; 1733 1734 if (res > MAX_LFS_FILESIZE) 1735 res = MAX_LFS_FILESIZE; 1736 1737 return res; 1738 } 1739 1740 static ext4_fsblk_t descriptor_loc(struct super_block *sb, 1741 ext4_fsblk_t logical_sb_block, int nr) 1742 { 1743 struct ext4_sb_info *sbi = EXT4_SB(sb); 1744 ext4_group_t bg, first_meta_bg; 1745 int has_super = 0; 1746 1747 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 1748 1749 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || 1750 nr < first_meta_bg) 1751 return logical_sb_block + nr + 1; 1752 bg = sbi->s_desc_per_block * nr; 1753 if (ext4_bg_has_super(sb, bg)) 1754 has_super = 1; 1755 return (has_super + ext4_group_first_block_no(sb, bg)); 1756 } 1757 1758 /** 1759 * ext4_get_stripe_size: Get the stripe size. 1760 * @sbi: In memory super block info 1761 * 1762 * If we have specified it via mount option, then 1763 * use the mount option value. If the value specified at mount time is 1764 * greater than the blocks per group use the super block value. 1765 * If the super block value is greater than blocks per group return 0. 1766 * Allocator needs it be less than blocks per group. 1767 * 1768 */ 1769 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) 1770 { 1771 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); 1772 unsigned long stripe_width = 1773 le32_to_cpu(sbi->s_es->s_raid_stripe_width); 1774 1775 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) 1776 return sbi->s_stripe; 1777 1778 if (stripe_width <= sbi->s_blocks_per_group) 1779 return stripe_width; 1780 1781 if (stride <= sbi->s_blocks_per_group) 1782 return stride; 1783 1784 return 0; 1785 } 1786 1787 static int ext4_fill_super (struct super_block *sb, void *data, int silent) 1788 __releases(kernel_sem) 1789 __acquires(kernel_sem) 1790 1791 { 1792 struct buffer_head * bh; 1793 struct ext4_super_block *es = NULL; 1794 struct ext4_sb_info *sbi; 1795 ext4_fsblk_t block; 1796 ext4_fsblk_t sb_block = get_sb_block(&data); 1797 ext4_fsblk_t logical_sb_block; 1798 unsigned long offset = 0; 1799 unsigned int journal_inum = 0; 1800 unsigned long journal_devnum = 0; 1801 unsigned long def_mount_opts; 1802 struct inode *root; 1803 int ret = -EINVAL; 1804 int blocksize; 1805 int db_count; 1806 int i; 1807 int needs_recovery; 1808 __le32 features; 1809 __u64 blocks_count; 1810 int err; 1811 1812 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 1813 if (!sbi) 1814 return -ENOMEM; 1815 sb->s_fs_info = sbi; 1816 sbi->s_mount_opt = 0; 1817 sbi->s_resuid = EXT4_DEF_RESUID; 1818 sbi->s_resgid = EXT4_DEF_RESGID; 1819 sbi->s_sb_block = sb_block; 1820 1821 unlock_kernel(); 1822 1823 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); 1824 if (!blocksize) { 1825 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n"); 1826 goto out_fail; 1827 } 1828 1829 if (!sb_set_blocksize(sb, blocksize)) { 1830 printk(KERN_ERR "EXT4-fs: bad blocksize %d.\n", blocksize); 1831 goto out_fail; 1832 } 1833 1834 /* 1835 * The ext4 superblock will not be buffer aligned for other than 1kB 1836 * block sizes. We need to calculate the offset from buffer start. 1837 */ 1838 if (blocksize != EXT4_MIN_BLOCK_SIZE) { 1839 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 1840 offset = do_div(logical_sb_block, blocksize); 1841 } else { 1842 logical_sb_block = sb_block; 1843 } 1844 1845 if (!(bh = sb_bread(sb, logical_sb_block))) { 1846 printk (KERN_ERR "EXT4-fs: unable to read superblock\n"); 1847 goto out_fail; 1848 } 1849 /* 1850 * Note: s_es must be initialized as soon as possible because 1851 * some ext4 macro-instructions depend on its value 1852 */ 1853 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 1854 sbi->s_es = es; 1855 sb->s_magic = le16_to_cpu(es->s_magic); 1856 if (sb->s_magic != EXT4_SUPER_MAGIC) 1857 goto cantfind_ext4; 1858 1859 /* Set defaults before we parse the mount options */ 1860 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 1861 if (def_mount_opts & EXT4_DEFM_DEBUG) 1862 set_opt(sbi->s_mount_opt, DEBUG); 1863 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) 1864 set_opt(sbi->s_mount_opt, GRPID); 1865 if (def_mount_opts & EXT4_DEFM_UID16) 1866 set_opt(sbi->s_mount_opt, NO_UID32); 1867 #ifdef CONFIG_EXT4DEV_FS_XATTR 1868 if (def_mount_opts & EXT4_DEFM_XATTR_USER) 1869 set_opt(sbi->s_mount_opt, XATTR_USER); 1870 #endif 1871 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 1872 if (def_mount_opts & EXT4_DEFM_ACL) 1873 set_opt(sbi->s_mount_opt, POSIX_ACL); 1874 #endif 1875 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) 1876 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA; 1877 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) 1878 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA; 1879 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) 1880 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA; 1881 1882 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) 1883 set_opt(sbi->s_mount_opt, ERRORS_PANIC); 1884 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE) 1885 set_opt(sbi->s_mount_opt, ERRORS_CONT); 1886 else 1887 set_opt(sbi->s_mount_opt, ERRORS_RO); 1888 1889 sbi->s_resuid = le16_to_cpu(es->s_def_resuid); 1890 sbi->s_resgid = le16_to_cpu(es->s_def_resgid); 1891 1892 set_opt(sbi->s_mount_opt, RESERVATION); 1893 1894 /* 1895 * turn on extents feature by default in ext4 filesystem 1896 * User -o noextents to turn it off 1897 */ 1898 set_opt(sbi->s_mount_opt, EXTENTS); 1899 /* 1900 * turn on mballoc feature by default in ext4 filesystem 1901 * User -o nomballoc to turn it off 1902 */ 1903 set_opt(sbi->s_mount_opt, MBALLOC); 1904 1905 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum, 1906 NULL, 0)) 1907 goto failed_mount; 1908 1909 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 1910 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 1911 1912 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && 1913 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || 1914 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 1915 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) 1916 printk(KERN_WARNING 1917 "EXT4-fs warning: feature flags set on rev 0 fs, " 1918 "running e2fsck is recommended\n"); 1919 1920 /* 1921 * Since ext4 is still considered development code, we require 1922 * that the TEST_FILESYS flag in s->flags be set. 1923 */ 1924 if (!(le32_to_cpu(es->s_flags) & EXT2_FLAGS_TEST_FILESYS)) { 1925 printk(KERN_WARNING "EXT4-fs: %s: not marked " 1926 "OK to use with test code.\n", sb->s_id); 1927 goto failed_mount; 1928 } 1929 1930 /* 1931 * Check feature flags regardless of the revision level, since we 1932 * previously didn't change the revision level when setting the flags, 1933 * so there is a chance incompat flags are set on a rev 0 filesystem. 1934 */ 1935 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP); 1936 if (features) { 1937 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of " 1938 "unsupported optional features (%x).\n", 1939 sb->s_id, le32_to_cpu(features)); 1940 goto failed_mount; 1941 } 1942 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP); 1943 if (!(sb->s_flags & MS_RDONLY) && features) { 1944 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of " 1945 "unsupported optional features (%x).\n", 1946 sb->s_id, le32_to_cpu(features)); 1947 goto failed_mount; 1948 } 1949 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) { 1950 /* 1951 * Large file size enabled file system can only be 1952 * mount if kernel is build with CONFIG_LSF 1953 */ 1954 if (sizeof(root->i_blocks) < sizeof(u64) && 1955 !(sb->s_flags & MS_RDONLY)) { 1956 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge " 1957 "files cannot be mounted read-write " 1958 "without CONFIG_LSF.\n", sb->s_id); 1959 goto failed_mount; 1960 } 1961 } 1962 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); 1963 1964 if (blocksize < EXT4_MIN_BLOCK_SIZE || 1965 blocksize > EXT4_MAX_BLOCK_SIZE) { 1966 printk(KERN_ERR 1967 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n", 1968 blocksize, sb->s_id); 1969 goto failed_mount; 1970 } 1971 1972 if (sb->s_blocksize != blocksize) { 1973 1974 /* Validate the filesystem blocksize */ 1975 if (!sb_set_blocksize(sb, blocksize)) { 1976 printk(KERN_ERR "EXT4-fs: bad block size %d.\n", 1977 blocksize); 1978 goto failed_mount; 1979 } 1980 1981 brelse (bh); 1982 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 1983 offset = do_div(logical_sb_block, blocksize); 1984 bh = sb_bread(sb, logical_sb_block); 1985 if (!bh) { 1986 printk(KERN_ERR 1987 "EXT4-fs: Can't read superblock on 2nd try.\n"); 1988 goto failed_mount; 1989 } 1990 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); 1991 sbi->s_es = es; 1992 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { 1993 printk (KERN_ERR 1994 "EXT4-fs: Magic mismatch, very weird !\n"); 1995 goto failed_mount; 1996 } 1997 } 1998 1999 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits); 2000 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits); 2001 2002 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { 2003 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; 2004 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; 2005 } else { 2006 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 2007 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 2008 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || 2009 (!is_power_of_2(sbi->s_inode_size)) || 2010 (sbi->s_inode_size > blocksize)) { 2011 printk (KERN_ERR 2012 "EXT4-fs: unsupported inode size: %d\n", 2013 sbi->s_inode_size); 2014 goto failed_mount; 2015 } 2016 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) 2017 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); 2018 } 2019 sbi->s_desc_size = le16_to_cpu(es->s_desc_size); 2020 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { 2021 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || 2022 sbi->s_desc_size > EXT4_MAX_DESC_SIZE || 2023 !is_power_of_2(sbi->s_desc_size)) { 2024 printk(KERN_ERR 2025 "EXT4-fs: unsupported descriptor size %lu\n", 2026 sbi->s_desc_size); 2027 goto failed_mount; 2028 } 2029 } else 2030 sbi->s_desc_size = EXT4_MIN_DESC_SIZE; 2031 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 2032 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 2033 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0) 2034 goto cantfind_ext4; 2035 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); 2036 if (sbi->s_inodes_per_block == 0) 2037 goto cantfind_ext4; 2038 sbi->s_itb_per_group = sbi->s_inodes_per_group / 2039 sbi->s_inodes_per_block; 2040 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); 2041 sbi->s_sbh = bh; 2042 sbi->s_mount_state = le16_to_cpu(es->s_state); 2043 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); 2044 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); 2045 for (i=0; i < 4; i++) 2046 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); 2047 sbi->s_def_hash_version = es->s_def_hash_version; 2048 2049 if (sbi->s_blocks_per_group > blocksize * 8) { 2050 printk (KERN_ERR 2051 "EXT4-fs: #blocks per group too big: %lu\n", 2052 sbi->s_blocks_per_group); 2053 goto failed_mount; 2054 } 2055 if (sbi->s_inodes_per_group > blocksize * 8) { 2056 printk (KERN_ERR 2057 "EXT4-fs: #inodes per group too big: %lu\n", 2058 sbi->s_inodes_per_group); 2059 goto failed_mount; 2060 } 2061 2062 if (ext4_blocks_count(es) > 2063 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { 2064 printk(KERN_ERR "EXT4-fs: filesystem on %s:" 2065 " too large to mount safely\n", sb->s_id); 2066 if (sizeof(sector_t) < 8) 2067 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not " 2068 "enabled\n"); 2069 goto failed_mount; 2070 } 2071 2072 if (EXT4_BLOCKS_PER_GROUP(sb) == 0) 2073 goto cantfind_ext4; 2074 2075 /* ensure blocks_count calculation below doesn't sign-extend */ 2076 if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) < 2077 le32_to_cpu(es->s_first_data_block) + 1) { 2078 printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, " 2079 "first data block %u, blocks per group %lu\n", 2080 ext4_blocks_count(es), 2081 le32_to_cpu(es->s_first_data_block), 2082 EXT4_BLOCKS_PER_GROUP(sb)); 2083 goto failed_mount; 2084 } 2085 blocks_count = (ext4_blocks_count(es) - 2086 le32_to_cpu(es->s_first_data_block) + 2087 EXT4_BLOCKS_PER_GROUP(sb) - 1); 2088 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); 2089 sbi->s_groups_count = blocks_count; 2090 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / 2091 EXT4_DESC_PER_BLOCK(sb); 2092 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *), 2093 GFP_KERNEL); 2094 if (sbi->s_group_desc == NULL) { 2095 printk (KERN_ERR "EXT4-fs: not enough memory\n"); 2096 goto failed_mount; 2097 } 2098 2099 bgl_lock_init(&sbi->s_blockgroup_lock); 2100 2101 for (i = 0; i < db_count; i++) { 2102 block = descriptor_loc(sb, logical_sb_block, i); 2103 sbi->s_group_desc[i] = sb_bread(sb, block); 2104 if (!sbi->s_group_desc[i]) { 2105 printk (KERN_ERR "EXT4-fs: " 2106 "can't read group descriptor %d\n", i); 2107 db_count = i; 2108 goto failed_mount2; 2109 } 2110 } 2111 if (!ext4_check_descriptors (sb)) { 2112 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n"); 2113 goto failed_mount2; 2114 } 2115 sbi->s_gdb_count = db_count; 2116 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 2117 spin_lock_init(&sbi->s_next_gen_lock); 2118 2119 err = percpu_counter_init(&sbi->s_freeblocks_counter, 2120 ext4_count_free_blocks(sb)); 2121 if (!err) { 2122 err = percpu_counter_init(&sbi->s_freeinodes_counter, 2123 ext4_count_free_inodes(sb)); 2124 } 2125 if (!err) { 2126 err = percpu_counter_init(&sbi->s_dirs_counter, 2127 ext4_count_dirs(sb)); 2128 } 2129 if (err) { 2130 printk(KERN_ERR "EXT4-fs: insufficient memory\n"); 2131 goto failed_mount3; 2132 } 2133 2134 /* per fileystem reservation list head & lock */ 2135 spin_lock_init(&sbi->s_rsv_window_lock); 2136 sbi->s_rsv_window_root = RB_ROOT; 2137 /* Add a single, static dummy reservation to the start of the 2138 * reservation window list --- it gives us a placeholder for 2139 * append-at-start-of-list which makes the allocation logic 2140 * _much_ simpler. */ 2141 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; 2142 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; 2143 sbi->s_rsv_window_head.rsv_alloc_hit = 0; 2144 sbi->s_rsv_window_head.rsv_goal_size = 0; 2145 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head); 2146 2147 sbi->s_stripe = ext4_get_stripe_size(sbi); 2148 2149 /* 2150 * set up enough so that it can read an inode 2151 */ 2152 sb->s_op = &ext4_sops; 2153 sb->s_export_op = &ext4_export_ops; 2154 sb->s_xattr = ext4_xattr_handlers; 2155 #ifdef CONFIG_QUOTA 2156 sb->s_qcop = &ext4_qctl_operations; 2157 sb->dq_op = &ext4_quota_operations; 2158 #endif 2159 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ 2160 2161 sb->s_root = NULL; 2162 2163 needs_recovery = (es->s_last_orphan != 0 || 2164 EXT4_HAS_INCOMPAT_FEATURE(sb, 2165 EXT4_FEATURE_INCOMPAT_RECOVER)); 2166 2167 /* 2168 * The first inode we look at is the journal inode. Don't try 2169 * root first: it may be modified in the journal! 2170 */ 2171 if (!test_opt(sb, NOLOAD) && 2172 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 2173 if (ext4_load_journal(sb, es, journal_devnum)) 2174 goto failed_mount3; 2175 } else if (journal_inum) { 2176 if (ext4_create_journal(sb, es, journal_inum)) 2177 goto failed_mount3; 2178 } else { 2179 if (!silent) 2180 printk (KERN_ERR 2181 "ext4: No journal on filesystem on %s\n", 2182 sb->s_id); 2183 goto failed_mount3; 2184 } 2185 2186 if (ext4_blocks_count(es) > 0xffffffffULL && 2187 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, 2188 JBD2_FEATURE_INCOMPAT_64BIT)) { 2189 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n"); 2190 goto failed_mount4; 2191 } 2192 2193 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 2194 jbd2_journal_set_features(sbi->s_journal, 2195 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 2196 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2197 } else if (test_opt(sb, JOURNAL_CHECKSUM)) { 2198 jbd2_journal_set_features(sbi->s_journal, 2199 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0); 2200 jbd2_journal_clear_features(sbi->s_journal, 0, 0, 2201 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2202 } else { 2203 jbd2_journal_clear_features(sbi->s_journal, 2204 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 2205 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2206 } 2207 2208 /* We have now updated the journal if required, so we can 2209 * validate the data journaling mode. */ 2210 switch (test_opt(sb, DATA_FLAGS)) { 2211 case 0: 2212 /* No mode set, assume a default based on the journal 2213 * capabilities: ORDERED_DATA if the journal can 2214 * cope, else JOURNAL_DATA 2215 */ 2216 if (jbd2_journal_check_available_features 2217 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) 2218 set_opt(sbi->s_mount_opt, ORDERED_DATA); 2219 else 2220 set_opt(sbi->s_mount_opt, JOURNAL_DATA); 2221 break; 2222 2223 case EXT4_MOUNT_ORDERED_DATA: 2224 case EXT4_MOUNT_WRITEBACK_DATA: 2225 if (!jbd2_journal_check_available_features 2226 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { 2227 printk(KERN_ERR "EXT4-fs: Journal does not support " 2228 "requested data journaling mode\n"); 2229 goto failed_mount4; 2230 } 2231 default: 2232 break; 2233 } 2234 2235 if (test_opt(sb, NOBH)) { 2236 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) { 2237 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - " 2238 "its supported only with writeback mode\n"); 2239 clear_opt(sbi->s_mount_opt, NOBH); 2240 } 2241 } 2242 /* 2243 * The jbd2_journal_load will have done any necessary log recovery, 2244 * so we can safely mount the rest of the filesystem now. 2245 */ 2246 2247 root = ext4_iget(sb, EXT4_ROOT_INO); 2248 if (IS_ERR(root)) { 2249 printk(KERN_ERR "EXT4-fs: get root inode failed\n"); 2250 ret = PTR_ERR(root); 2251 goto failed_mount4; 2252 } 2253 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 2254 iput(root); 2255 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n"); 2256 goto failed_mount4; 2257 } 2258 sb->s_root = d_alloc_root(root); 2259 if (!sb->s_root) { 2260 printk(KERN_ERR "EXT4-fs: get root dentry failed\n"); 2261 iput(root); 2262 ret = -ENOMEM; 2263 goto failed_mount4; 2264 } 2265 2266 ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY); 2267 2268 /* determine the minimum size of new large inodes, if present */ 2269 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { 2270 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 2271 EXT4_GOOD_OLD_INODE_SIZE; 2272 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 2273 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { 2274 if (sbi->s_want_extra_isize < 2275 le16_to_cpu(es->s_want_extra_isize)) 2276 sbi->s_want_extra_isize = 2277 le16_to_cpu(es->s_want_extra_isize); 2278 if (sbi->s_want_extra_isize < 2279 le16_to_cpu(es->s_min_extra_isize)) 2280 sbi->s_want_extra_isize = 2281 le16_to_cpu(es->s_min_extra_isize); 2282 } 2283 } 2284 /* Check if enough inode space is available */ 2285 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > 2286 sbi->s_inode_size) { 2287 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 2288 EXT4_GOOD_OLD_INODE_SIZE; 2289 printk(KERN_INFO "EXT4-fs: required extra inode space not" 2290 "available.\n"); 2291 } 2292 2293 /* 2294 * akpm: core read_super() calls in here with the superblock locked. 2295 * That deadlocks, because orphan cleanup needs to lock the superblock 2296 * in numerous places. Here we just pop the lock - it's relatively 2297 * harmless, because we are now ready to accept write_super() requests, 2298 * and aviro says that's the only reason for hanging onto the 2299 * superblock lock. 2300 */ 2301 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; 2302 ext4_orphan_cleanup(sb, es); 2303 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; 2304 if (needs_recovery) 2305 printk (KERN_INFO "EXT4-fs: recovery complete.\n"); 2306 ext4_mark_recovery_complete(sb, es); 2307 printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n", 2308 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal": 2309 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered": 2310 "writeback"); 2311 2312 ext4_ext_init(sb); 2313 ext4_mb_init(sb, needs_recovery); 2314 2315 lock_kernel(); 2316 return 0; 2317 2318 cantfind_ext4: 2319 if (!silent) 2320 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n", 2321 sb->s_id); 2322 goto failed_mount; 2323 2324 failed_mount4: 2325 jbd2_journal_destroy(sbi->s_journal); 2326 failed_mount3: 2327 percpu_counter_destroy(&sbi->s_freeblocks_counter); 2328 percpu_counter_destroy(&sbi->s_freeinodes_counter); 2329 percpu_counter_destroy(&sbi->s_dirs_counter); 2330 failed_mount2: 2331 for (i = 0; i < db_count; i++) 2332 brelse(sbi->s_group_desc[i]); 2333 kfree(sbi->s_group_desc); 2334 failed_mount: 2335 #ifdef CONFIG_QUOTA 2336 for (i = 0; i < MAXQUOTAS; i++) 2337 kfree(sbi->s_qf_names[i]); 2338 #endif 2339 ext4_blkdev_remove(sbi); 2340 brelse(bh); 2341 out_fail: 2342 sb->s_fs_info = NULL; 2343 kfree(sbi); 2344 lock_kernel(); 2345 return ret; 2346 } 2347 2348 /* 2349 * Setup any per-fs journal parameters now. We'll do this both on 2350 * initial mount, once the journal has been initialised but before we've 2351 * done any recovery; and again on any subsequent remount. 2352 */ 2353 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) 2354 { 2355 struct ext4_sb_info *sbi = EXT4_SB(sb); 2356 2357 if (sbi->s_commit_interval) 2358 journal->j_commit_interval = sbi->s_commit_interval; 2359 /* We could also set up an ext4-specific default for the commit 2360 * interval here, but for now we'll just fall back to the jbd 2361 * default. */ 2362 2363 spin_lock(&journal->j_state_lock); 2364 if (test_opt(sb, BARRIER)) 2365 journal->j_flags |= JBD2_BARRIER; 2366 else 2367 journal->j_flags &= ~JBD2_BARRIER; 2368 spin_unlock(&journal->j_state_lock); 2369 } 2370 2371 static journal_t *ext4_get_journal(struct super_block *sb, 2372 unsigned int journal_inum) 2373 { 2374 struct inode *journal_inode; 2375 journal_t *journal; 2376 2377 /* First, test for the existence of a valid inode on disk. Bad 2378 * things happen if we iget() an unused inode, as the subsequent 2379 * iput() will try to delete it. */ 2380 2381 journal_inode = ext4_iget(sb, journal_inum); 2382 if (IS_ERR(journal_inode)) { 2383 printk(KERN_ERR "EXT4-fs: no journal found.\n"); 2384 return NULL; 2385 } 2386 if (!journal_inode->i_nlink) { 2387 make_bad_inode(journal_inode); 2388 iput(journal_inode); 2389 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n"); 2390 return NULL; 2391 } 2392 2393 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n", 2394 journal_inode, journal_inode->i_size); 2395 if (!S_ISREG(journal_inode->i_mode)) { 2396 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n"); 2397 iput(journal_inode); 2398 return NULL; 2399 } 2400 2401 journal = jbd2_journal_init_inode(journal_inode); 2402 if (!journal) { 2403 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n"); 2404 iput(journal_inode); 2405 return NULL; 2406 } 2407 journal->j_private = sb; 2408 ext4_init_journal_params(sb, journal); 2409 return journal; 2410 } 2411 2412 static journal_t *ext4_get_dev_journal(struct super_block *sb, 2413 dev_t j_dev) 2414 { 2415 struct buffer_head * bh; 2416 journal_t *journal; 2417 ext4_fsblk_t start; 2418 ext4_fsblk_t len; 2419 int hblock, blocksize; 2420 ext4_fsblk_t sb_block; 2421 unsigned long offset; 2422 struct ext4_super_block * es; 2423 struct block_device *bdev; 2424 2425 bdev = ext4_blkdev_get(j_dev); 2426 if (bdev == NULL) 2427 return NULL; 2428 2429 if (bd_claim(bdev, sb)) { 2430 printk(KERN_ERR 2431 "EXT4: failed to claim external journal device.\n"); 2432 blkdev_put(bdev); 2433 return NULL; 2434 } 2435 2436 blocksize = sb->s_blocksize; 2437 hblock = bdev_hardsect_size(bdev); 2438 if (blocksize < hblock) { 2439 printk(KERN_ERR 2440 "EXT4-fs: blocksize too small for journal device.\n"); 2441 goto out_bdev; 2442 } 2443 2444 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; 2445 offset = EXT4_MIN_BLOCK_SIZE % blocksize; 2446 set_blocksize(bdev, blocksize); 2447 if (!(bh = __bread(bdev, sb_block, blocksize))) { 2448 printk(KERN_ERR "EXT4-fs: couldn't read superblock of " 2449 "external journal\n"); 2450 goto out_bdev; 2451 } 2452 2453 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 2454 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || 2455 !(le32_to_cpu(es->s_feature_incompat) & 2456 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { 2457 printk(KERN_ERR "EXT4-fs: external journal has " 2458 "bad superblock\n"); 2459 brelse(bh); 2460 goto out_bdev; 2461 } 2462 2463 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { 2464 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n"); 2465 brelse(bh); 2466 goto out_bdev; 2467 } 2468 2469 len = ext4_blocks_count(es); 2470 start = sb_block + 1; 2471 brelse(bh); /* we're done with the superblock */ 2472 2473 journal = jbd2_journal_init_dev(bdev, sb->s_bdev, 2474 start, len, blocksize); 2475 if (!journal) { 2476 printk(KERN_ERR "EXT4-fs: failed to create device journal\n"); 2477 goto out_bdev; 2478 } 2479 journal->j_private = sb; 2480 ll_rw_block(READ, 1, &journal->j_sb_buffer); 2481 wait_on_buffer(journal->j_sb_buffer); 2482 if (!buffer_uptodate(journal->j_sb_buffer)) { 2483 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n"); 2484 goto out_journal; 2485 } 2486 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { 2487 printk(KERN_ERR "EXT4-fs: External journal has more than one " 2488 "user (unsupported) - %d\n", 2489 be32_to_cpu(journal->j_superblock->s_nr_users)); 2490 goto out_journal; 2491 } 2492 EXT4_SB(sb)->journal_bdev = bdev; 2493 ext4_init_journal_params(sb, journal); 2494 return journal; 2495 out_journal: 2496 jbd2_journal_destroy(journal); 2497 out_bdev: 2498 ext4_blkdev_put(bdev); 2499 return NULL; 2500 } 2501 2502 static int ext4_load_journal(struct super_block *sb, 2503 struct ext4_super_block *es, 2504 unsigned long journal_devnum) 2505 { 2506 journal_t *journal; 2507 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); 2508 dev_t journal_dev; 2509 int err = 0; 2510 int really_read_only; 2511 2512 if (journal_devnum && 2513 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 2514 printk(KERN_INFO "EXT4-fs: external journal device major/minor " 2515 "numbers have changed\n"); 2516 journal_dev = new_decode_dev(journal_devnum); 2517 } else 2518 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); 2519 2520 really_read_only = bdev_read_only(sb->s_bdev); 2521 2522 /* 2523 * Are we loading a blank journal or performing recovery after a 2524 * crash? For recovery, we need to check in advance whether we 2525 * can get read-write access to the device. 2526 */ 2527 2528 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 2529 if (sb->s_flags & MS_RDONLY) { 2530 printk(KERN_INFO "EXT4-fs: INFO: recovery " 2531 "required on readonly filesystem.\n"); 2532 if (really_read_only) { 2533 printk(KERN_ERR "EXT4-fs: write access " 2534 "unavailable, cannot proceed.\n"); 2535 return -EROFS; 2536 } 2537 printk (KERN_INFO "EXT4-fs: write access will " 2538 "be enabled during recovery.\n"); 2539 } 2540 } 2541 2542 if (journal_inum && journal_dev) { 2543 printk(KERN_ERR "EXT4-fs: filesystem has both journal " 2544 "and inode journals!\n"); 2545 return -EINVAL; 2546 } 2547 2548 if (journal_inum) { 2549 if (!(journal = ext4_get_journal(sb, journal_inum))) 2550 return -EINVAL; 2551 } else { 2552 if (!(journal = ext4_get_dev_journal(sb, journal_dev))) 2553 return -EINVAL; 2554 } 2555 2556 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { 2557 err = jbd2_journal_update_format(journal); 2558 if (err) { 2559 printk(KERN_ERR "EXT4-fs: error updating journal.\n"); 2560 jbd2_journal_destroy(journal); 2561 return err; 2562 } 2563 } 2564 2565 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) 2566 err = jbd2_journal_wipe(journal, !really_read_only); 2567 if (!err) 2568 err = jbd2_journal_load(journal); 2569 2570 if (err) { 2571 printk(KERN_ERR "EXT4-fs: error loading journal.\n"); 2572 jbd2_journal_destroy(journal); 2573 return err; 2574 } 2575 2576 EXT4_SB(sb)->s_journal = journal; 2577 ext4_clear_journal_err(sb, es); 2578 2579 if (journal_devnum && 2580 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 2581 es->s_journal_dev = cpu_to_le32(journal_devnum); 2582 sb->s_dirt = 1; 2583 2584 /* Make sure we flush the recovery flag to disk. */ 2585 ext4_commit_super(sb, es, 1); 2586 } 2587 2588 return 0; 2589 } 2590 2591 static int ext4_create_journal(struct super_block * sb, 2592 struct ext4_super_block * es, 2593 unsigned int journal_inum) 2594 { 2595 journal_t *journal; 2596 int err; 2597 2598 if (sb->s_flags & MS_RDONLY) { 2599 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to " 2600 "create journal.\n"); 2601 return -EROFS; 2602 } 2603 2604 journal = ext4_get_journal(sb, journal_inum); 2605 if (!journal) 2606 return -EINVAL; 2607 2608 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n", 2609 journal_inum); 2610 2611 err = jbd2_journal_create(journal); 2612 if (err) { 2613 printk(KERN_ERR "EXT4-fs: error creating journal.\n"); 2614 jbd2_journal_destroy(journal); 2615 return -EIO; 2616 } 2617 2618 EXT4_SB(sb)->s_journal = journal; 2619 2620 ext4_update_dynamic_rev(sb); 2621 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2622 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL); 2623 2624 es->s_journal_inum = cpu_to_le32(journal_inum); 2625 sb->s_dirt = 1; 2626 2627 /* Make sure we flush the recovery flag to disk. */ 2628 ext4_commit_super(sb, es, 1); 2629 2630 return 0; 2631 } 2632 2633 static void ext4_commit_super (struct super_block * sb, 2634 struct ext4_super_block * es, 2635 int sync) 2636 { 2637 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; 2638 2639 if (!sbh) 2640 return; 2641 es->s_wtime = cpu_to_le32(get_seconds()); 2642 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb)); 2643 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb)); 2644 BUFFER_TRACE(sbh, "marking dirty"); 2645 mark_buffer_dirty(sbh); 2646 if (sync) 2647 sync_dirty_buffer(sbh); 2648 } 2649 2650 2651 /* 2652 * Have we just finished recovery? If so, and if we are mounting (or 2653 * remounting) the filesystem readonly, then we will end up with a 2654 * consistent fs on disk. Record that fact. 2655 */ 2656 static void ext4_mark_recovery_complete(struct super_block * sb, 2657 struct ext4_super_block * es) 2658 { 2659 journal_t *journal = EXT4_SB(sb)->s_journal; 2660 2661 jbd2_journal_lock_updates(journal); 2662 jbd2_journal_flush(journal); 2663 lock_super(sb); 2664 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && 2665 sb->s_flags & MS_RDONLY) { 2666 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2667 sb->s_dirt = 0; 2668 ext4_commit_super(sb, es, 1); 2669 } 2670 unlock_super(sb); 2671 jbd2_journal_unlock_updates(journal); 2672 } 2673 2674 /* 2675 * If we are mounting (or read-write remounting) a filesystem whose journal 2676 * has recorded an error from a previous lifetime, move that error to the 2677 * main filesystem now. 2678 */ 2679 static void ext4_clear_journal_err(struct super_block * sb, 2680 struct ext4_super_block * es) 2681 { 2682 journal_t *journal; 2683 int j_errno; 2684 const char *errstr; 2685 2686 journal = EXT4_SB(sb)->s_journal; 2687 2688 /* 2689 * Now check for any error status which may have been recorded in the 2690 * journal by a prior ext4_error() or ext4_abort() 2691 */ 2692 2693 j_errno = jbd2_journal_errno(journal); 2694 if (j_errno) { 2695 char nbuf[16]; 2696 2697 errstr = ext4_decode_error(sb, j_errno, nbuf); 2698 ext4_warning(sb, __func__, "Filesystem error recorded " 2699 "from previous mount: %s", errstr); 2700 ext4_warning(sb, __func__, "Marking fs in need of " 2701 "filesystem check."); 2702 2703 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 2704 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 2705 ext4_commit_super (sb, es, 1); 2706 2707 jbd2_journal_clear_err(journal); 2708 } 2709 } 2710 2711 /* 2712 * Force the running and committing transactions to commit, 2713 * and wait on the commit. 2714 */ 2715 int ext4_force_commit(struct super_block *sb) 2716 { 2717 journal_t *journal; 2718 int ret; 2719 2720 if (sb->s_flags & MS_RDONLY) 2721 return 0; 2722 2723 journal = EXT4_SB(sb)->s_journal; 2724 sb->s_dirt = 0; 2725 ret = ext4_journal_force_commit(journal); 2726 return ret; 2727 } 2728 2729 /* 2730 * Ext4 always journals updates to the superblock itself, so we don't 2731 * have to propagate any other updates to the superblock on disk at this 2732 * point. Just start an async writeback to get the buffers on their way 2733 * to the disk. 2734 * 2735 * This implicitly triggers the writebehind on sync(). 2736 */ 2737 2738 static void ext4_write_super (struct super_block * sb) 2739 { 2740 if (mutex_trylock(&sb->s_lock) != 0) 2741 BUG(); 2742 sb->s_dirt = 0; 2743 } 2744 2745 static int ext4_sync_fs(struct super_block *sb, int wait) 2746 { 2747 tid_t target; 2748 2749 sb->s_dirt = 0; 2750 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) { 2751 if (wait) 2752 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target); 2753 } 2754 return 0; 2755 } 2756 2757 /* 2758 * LVM calls this function before a (read-only) snapshot is created. This 2759 * gives us a chance to flush the journal completely and mark the fs clean. 2760 */ 2761 static void ext4_write_super_lockfs(struct super_block *sb) 2762 { 2763 sb->s_dirt = 0; 2764 2765 if (!(sb->s_flags & MS_RDONLY)) { 2766 journal_t *journal = EXT4_SB(sb)->s_journal; 2767 2768 /* Now we set up the journal barrier. */ 2769 jbd2_journal_lock_updates(journal); 2770 jbd2_journal_flush(journal); 2771 2772 /* Journal blocked and flushed, clear needs_recovery flag. */ 2773 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2774 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); 2775 } 2776 } 2777 2778 /* 2779 * Called by LVM after the snapshot is done. We need to reset the RECOVER 2780 * flag here, even though the filesystem is not technically dirty yet. 2781 */ 2782 static void ext4_unlockfs(struct super_block *sb) 2783 { 2784 if (!(sb->s_flags & MS_RDONLY)) { 2785 lock_super(sb); 2786 /* Reser the needs_recovery flag before the fs is unlocked. */ 2787 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2788 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); 2789 unlock_super(sb); 2790 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 2791 } 2792 } 2793 2794 static int ext4_remount (struct super_block * sb, int * flags, char * data) 2795 { 2796 struct ext4_super_block * es; 2797 struct ext4_sb_info *sbi = EXT4_SB(sb); 2798 ext4_fsblk_t n_blocks_count = 0; 2799 unsigned long old_sb_flags; 2800 struct ext4_mount_options old_opts; 2801 int err; 2802 #ifdef CONFIG_QUOTA 2803 int i; 2804 #endif 2805 2806 /* Store the original options */ 2807 old_sb_flags = sb->s_flags; 2808 old_opts.s_mount_opt = sbi->s_mount_opt; 2809 old_opts.s_resuid = sbi->s_resuid; 2810 old_opts.s_resgid = sbi->s_resgid; 2811 old_opts.s_commit_interval = sbi->s_commit_interval; 2812 #ifdef CONFIG_QUOTA 2813 old_opts.s_jquota_fmt = sbi->s_jquota_fmt; 2814 for (i = 0; i < MAXQUOTAS; i++) 2815 old_opts.s_qf_names[i] = sbi->s_qf_names[i]; 2816 #endif 2817 2818 /* 2819 * Allow the "check" option to be passed as a remount option. 2820 */ 2821 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) { 2822 err = -EINVAL; 2823 goto restore_opts; 2824 } 2825 2826 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) 2827 ext4_abort(sb, __func__, "Abort forced by user"); 2828 2829 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 2830 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 2831 2832 es = sbi->s_es; 2833 2834 ext4_init_journal_params(sb, sbi->s_journal); 2835 2836 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || 2837 n_blocks_count > ext4_blocks_count(es)) { 2838 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) { 2839 err = -EROFS; 2840 goto restore_opts; 2841 } 2842 2843 if (*flags & MS_RDONLY) { 2844 /* 2845 * First of all, the unconditional stuff we have to do 2846 * to disable replay of the journal when we next remount 2847 */ 2848 sb->s_flags |= MS_RDONLY; 2849 2850 /* 2851 * OK, test if we are remounting a valid rw partition 2852 * readonly, and if so set the rdonly flag and then 2853 * mark the partition as valid again. 2854 */ 2855 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && 2856 (sbi->s_mount_state & EXT4_VALID_FS)) 2857 es->s_state = cpu_to_le16(sbi->s_mount_state); 2858 2859 /* 2860 * We have to unlock super so that we can wait for 2861 * transactions. 2862 */ 2863 unlock_super(sb); 2864 ext4_mark_recovery_complete(sb, es); 2865 lock_super(sb); 2866 } else { 2867 __le32 ret; 2868 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb, 2869 ~EXT4_FEATURE_RO_COMPAT_SUPP))) { 2870 printk(KERN_WARNING "EXT4-fs: %s: couldn't " 2871 "remount RDWR because of unsupported " 2872 "optional features (%x).\n", 2873 sb->s_id, le32_to_cpu(ret)); 2874 err = -EROFS; 2875 goto restore_opts; 2876 } 2877 2878 /* 2879 * If we have an unprocessed orphan list hanging 2880 * around from a previously readonly bdev mount, 2881 * require a full umount/remount for now. 2882 */ 2883 if (es->s_last_orphan) { 2884 printk(KERN_WARNING "EXT4-fs: %s: couldn't " 2885 "remount RDWR because of unprocessed " 2886 "orphan inode list. Please " 2887 "umount/remount instead.\n", 2888 sb->s_id); 2889 err = -EINVAL; 2890 goto restore_opts; 2891 } 2892 2893 /* 2894 * Mounting a RDONLY partition read-write, so reread 2895 * and store the current valid flag. (It may have 2896 * been changed by e2fsck since we originally mounted 2897 * the partition.) 2898 */ 2899 ext4_clear_journal_err(sb, es); 2900 sbi->s_mount_state = le16_to_cpu(es->s_state); 2901 if ((err = ext4_group_extend(sb, es, n_blocks_count))) 2902 goto restore_opts; 2903 if (!ext4_setup_super (sb, es, 0)) 2904 sb->s_flags &= ~MS_RDONLY; 2905 } 2906 } 2907 #ifdef CONFIG_QUOTA 2908 /* Release old quota file names */ 2909 for (i = 0; i < MAXQUOTAS; i++) 2910 if (old_opts.s_qf_names[i] && 2911 old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 2912 kfree(old_opts.s_qf_names[i]); 2913 #endif 2914 return 0; 2915 restore_opts: 2916 sb->s_flags = old_sb_flags; 2917 sbi->s_mount_opt = old_opts.s_mount_opt; 2918 sbi->s_resuid = old_opts.s_resuid; 2919 sbi->s_resgid = old_opts.s_resgid; 2920 sbi->s_commit_interval = old_opts.s_commit_interval; 2921 #ifdef CONFIG_QUOTA 2922 sbi->s_jquota_fmt = old_opts.s_jquota_fmt; 2923 for (i = 0; i < MAXQUOTAS; i++) { 2924 if (sbi->s_qf_names[i] && 2925 old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 2926 kfree(sbi->s_qf_names[i]); 2927 sbi->s_qf_names[i] = old_opts.s_qf_names[i]; 2928 } 2929 #endif 2930 return err; 2931 } 2932 2933 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf) 2934 { 2935 struct super_block *sb = dentry->d_sb; 2936 struct ext4_sb_info *sbi = EXT4_SB(sb); 2937 struct ext4_super_block *es = sbi->s_es; 2938 u64 fsid; 2939 2940 if (test_opt(sb, MINIX_DF)) { 2941 sbi->s_overhead_last = 0; 2942 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) { 2943 ext4_group_t ngroups = sbi->s_groups_count, i; 2944 ext4_fsblk_t overhead = 0; 2945 smp_rmb(); 2946 2947 /* 2948 * Compute the overhead (FS structures). This is constant 2949 * for a given filesystem unless the number of block groups 2950 * changes so we cache the previous value until it does. 2951 */ 2952 2953 /* 2954 * All of the blocks before first_data_block are 2955 * overhead 2956 */ 2957 overhead = le32_to_cpu(es->s_first_data_block); 2958 2959 /* 2960 * Add the overhead attributed to the superblock and 2961 * block group descriptors. If the sparse superblocks 2962 * feature is turned on, then not all groups have this. 2963 */ 2964 for (i = 0; i < ngroups; i++) { 2965 overhead += ext4_bg_has_super(sb, i) + 2966 ext4_bg_num_gdb(sb, i); 2967 cond_resched(); 2968 } 2969 2970 /* 2971 * Every block group has an inode bitmap, a block 2972 * bitmap, and an inode table. 2973 */ 2974 overhead += ngroups * (2 + sbi->s_itb_per_group); 2975 sbi->s_overhead_last = overhead; 2976 smp_wmb(); 2977 sbi->s_blocks_last = ext4_blocks_count(es); 2978 } 2979 2980 buf->f_type = EXT4_SUPER_MAGIC; 2981 buf->f_bsize = sb->s_blocksize; 2982 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last; 2983 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter); 2984 ext4_free_blocks_count_set(es, buf->f_bfree); 2985 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); 2986 if (buf->f_bfree < ext4_r_blocks_count(es)) 2987 buf->f_bavail = 0; 2988 buf->f_files = le32_to_cpu(es->s_inodes_count); 2989 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); 2990 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); 2991 buf->f_namelen = EXT4_NAME_LEN; 2992 fsid = le64_to_cpup((void *)es->s_uuid) ^ 2993 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 2994 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 2995 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 2996 return 0; 2997 } 2998 2999 /* Helper function for writing quotas on sync - we need to start transaction before quota file 3000 * is locked for write. Otherwise the are possible deadlocks: 3001 * Process 1 Process 2 3002 * ext4_create() quota_sync() 3003 * jbd2_journal_start() write_dquot() 3004 * DQUOT_INIT() down(dqio_mutex) 3005 * down(dqio_mutex) jbd2_journal_start() 3006 * 3007 */ 3008 3009 #ifdef CONFIG_QUOTA 3010 3011 static inline struct inode *dquot_to_inode(struct dquot *dquot) 3012 { 3013 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; 3014 } 3015 3016 static int ext4_dquot_initialize(struct inode *inode, int type) 3017 { 3018 handle_t *handle; 3019 int ret, err; 3020 3021 /* We may create quota structure so we need to reserve enough blocks */ 3022 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb)); 3023 if (IS_ERR(handle)) 3024 return PTR_ERR(handle); 3025 ret = dquot_initialize(inode, type); 3026 err = ext4_journal_stop(handle); 3027 if (!ret) 3028 ret = err; 3029 return ret; 3030 } 3031 3032 static int ext4_dquot_drop(struct inode *inode) 3033 { 3034 handle_t *handle; 3035 int ret, err; 3036 3037 /* We may delete quota structure so we need to reserve enough blocks */ 3038 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb)); 3039 if (IS_ERR(handle)) { 3040 /* 3041 * We call dquot_drop() anyway to at least release references 3042 * to quota structures so that umount does not hang. 3043 */ 3044 dquot_drop(inode); 3045 return PTR_ERR(handle); 3046 } 3047 ret = dquot_drop(inode); 3048 err = ext4_journal_stop(handle); 3049 if (!ret) 3050 ret = err; 3051 return ret; 3052 } 3053 3054 static int ext4_write_dquot(struct dquot *dquot) 3055 { 3056 int ret, err; 3057 handle_t *handle; 3058 struct inode *inode; 3059 3060 inode = dquot_to_inode(dquot); 3061 handle = ext4_journal_start(inode, 3062 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 3063 if (IS_ERR(handle)) 3064 return PTR_ERR(handle); 3065 ret = dquot_commit(dquot); 3066 err = ext4_journal_stop(handle); 3067 if (!ret) 3068 ret = err; 3069 return ret; 3070 } 3071 3072 static int ext4_acquire_dquot(struct dquot *dquot) 3073 { 3074 int ret, err; 3075 handle_t *handle; 3076 3077 handle = ext4_journal_start(dquot_to_inode(dquot), 3078 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 3079 if (IS_ERR(handle)) 3080 return PTR_ERR(handle); 3081 ret = dquot_acquire(dquot); 3082 err = ext4_journal_stop(handle); 3083 if (!ret) 3084 ret = err; 3085 return ret; 3086 } 3087 3088 static int ext4_release_dquot(struct dquot *dquot) 3089 { 3090 int ret, err; 3091 handle_t *handle; 3092 3093 handle = ext4_journal_start(dquot_to_inode(dquot), 3094 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 3095 if (IS_ERR(handle)) { 3096 /* Release dquot anyway to avoid endless cycle in dqput() */ 3097 dquot_release(dquot); 3098 return PTR_ERR(handle); 3099 } 3100 ret = dquot_release(dquot); 3101 err = ext4_journal_stop(handle); 3102 if (!ret) 3103 ret = err; 3104 return ret; 3105 } 3106 3107 static int ext4_mark_dquot_dirty(struct dquot *dquot) 3108 { 3109 /* Are we journalling quotas? */ 3110 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || 3111 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { 3112 dquot_mark_dquot_dirty(dquot); 3113 return ext4_write_dquot(dquot); 3114 } else { 3115 return dquot_mark_dquot_dirty(dquot); 3116 } 3117 } 3118 3119 static int ext4_write_info(struct super_block *sb, int type) 3120 { 3121 int ret, err; 3122 handle_t *handle; 3123 3124 /* Data block + inode block */ 3125 handle = ext4_journal_start(sb->s_root->d_inode, 2); 3126 if (IS_ERR(handle)) 3127 return PTR_ERR(handle); 3128 ret = dquot_commit_info(sb, type); 3129 err = ext4_journal_stop(handle); 3130 if (!ret) 3131 ret = err; 3132 return ret; 3133 } 3134 3135 /* 3136 * Turn on quotas during mount time - we need to find 3137 * the quota file and such... 3138 */ 3139 static int ext4_quota_on_mount(struct super_block *sb, int type) 3140 { 3141 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], 3142 EXT4_SB(sb)->s_jquota_fmt, type); 3143 } 3144 3145 /* 3146 * Standard function to be called on quota_on 3147 */ 3148 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 3149 char *path, int remount) 3150 { 3151 int err; 3152 struct nameidata nd; 3153 3154 if (!test_opt(sb, QUOTA)) 3155 return -EINVAL; 3156 /* Not journalling quota? */ 3157 if ((!EXT4_SB(sb)->s_qf_names[USRQUOTA] && 3158 !EXT4_SB(sb)->s_qf_names[GRPQUOTA]) || remount) 3159 return vfs_quota_on(sb, type, format_id, path, remount); 3160 err = path_lookup(path, LOOKUP_FOLLOW, &nd); 3161 if (err) 3162 return err; 3163 /* Quotafile not on the same filesystem? */ 3164 if (nd.path.mnt->mnt_sb != sb) { 3165 path_put(&nd.path); 3166 return -EXDEV; 3167 } 3168 /* Quotafile not of fs root? */ 3169 if (nd.path.dentry->d_parent->d_inode != sb->s_root->d_inode) 3170 printk(KERN_WARNING 3171 "EXT4-fs: Quota file not on filesystem root. " 3172 "Journalled quota will not work.\n"); 3173 path_put(&nd.path); 3174 return vfs_quota_on(sb, type, format_id, path, remount); 3175 } 3176 3177 /* Read data from quotafile - avoid pagecache and such because we cannot afford 3178 * acquiring the locks... As quota files are never truncated and quota code 3179 * itself serializes the operations (and noone else should touch the files) 3180 * we don't have to be afraid of races */ 3181 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 3182 size_t len, loff_t off) 3183 { 3184 struct inode *inode = sb_dqopt(sb)->files[type]; 3185 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 3186 int err = 0; 3187 int offset = off & (sb->s_blocksize - 1); 3188 int tocopy; 3189 size_t toread; 3190 struct buffer_head *bh; 3191 loff_t i_size = i_size_read(inode); 3192 3193 if (off > i_size) 3194 return 0; 3195 if (off+len > i_size) 3196 len = i_size-off; 3197 toread = len; 3198 while (toread > 0) { 3199 tocopy = sb->s_blocksize - offset < toread ? 3200 sb->s_blocksize - offset : toread; 3201 bh = ext4_bread(NULL, inode, blk, 0, &err); 3202 if (err) 3203 return err; 3204 if (!bh) /* A hole? */ 3205 memset(data, 0, tocopy); 3206 else 3207 memcpy(data, bh->b_data+offset, tocopy); 3208 brelse(bh); 3209 offset = 0; 3210 toread -= tocopy; 3211 data += tocopy; 3212 blk++; 3213 } 3214 return len; 3215 } 3216 3217 /* Write to quotafile (we know the transaction is already started and has 3218 * enough credits) */ 3219 static ssize_t ext4_quota_write(struct super_block *sb, int type, 3220 const char *data, size_t len, loff_t off) 3221 { 3222 struct inode *inode = sb_dqopt(sb)->files[type]; 3223 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 3224 int err = 0; 3225 int offset = off & (sb->s_blocksize - 1); 3226 int tocopy; 3227 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL; 3228 size_t towrite = len; 3229 struct buffer_head *bh; 3230 handle_t *handle = journal_current_handle(); 3231 3232 if (!handle) { 3233 printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)" 3234 " cancelled because transaction is not started.\n", 3235 (unsigned long long)off, (unsigned long long)len); 3236 return -EIO; 3237 } 3238 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 3239 while (towrite > 0) { 3240 tocopy = sb->s_blocksize - offset < towrite ? 3241 sb->s_blocksize - offset : towrite; 3242 bh = ext4_bread(handle, inode, blk, 1, &err); 3243 if (!bh) 3244 goto out; 3245 if (journal_quota) { 3246 err = ext4_journal_get_write_access(handle, bh); 3247 if (err) { 3248 brelse(bh); 3249 goto out; 3250 } 3251 } 3252 lock_buffer(bh); 3253 memcpy(bh->b_data+offset, data, tocopy); 3254 flush_dcache_page(bh->b_page); 3255 unlock_buffer(bh); 3256 if (journal_quota) 3257 err = ext4_journal_dirty_metadata(handle, bh); 3258 else { 3259 /* Always do at least ordered writes for quotas */ 3260 err = ext4_journal_dirty_data(handle, bh); 3261 mark_buffer_dirty(bh); 3262 } 3263 brelse(bh); 3264 if (err) 3265 goto out; 3266 offset = 0; 3267 towrite -= tocopy; 3268 data += tocopy; 3269 blk++; 3270 } 3271 out: 3272 if (len == towrite) 3273 return err; 3274 if (inode->i_size < off+len-towrite) { 3275 i_size_write(inode, off+len-towrite); 3276 EXT4_I(inode)->i_disksize = inode->i_size; 3277 } 3278 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 3279 ext4_mark_inode_dirty(handle, inode); 3280 mutex_unlock(&inode->i_mutex); 3281 return len - towrite; 3282 } 3283 3284 #endif 3285 3286 static int ext4_get_sb(struct file_system_type *fs_type, 3287 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 3288 { 3289 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt); 3290 } 3291 3292 static struct file_system_type ext4dev_fs_type = { 3293 .owner = THIS_MODULE, 3294 .name = "ext4dev", 3295 .get_sb = ext4_get_sb, 3296 .kill_sb = kill_block_super, 3297 .fs_flags = FS_REQUIRES_DEV, 3298 }; 3299 3300 static int __init init_ext4_fs(void) 3301 { 3302 int err; 3303 3304 err = init_ext4_mballoc(); 3305 if (err) 3306 return err; 3307 3308 err = init_ext4_xattr(); 3309 if (err) 3310 goto out2; 3311 err = init_inodecache(); 3312 if (err) 3313 goto out1; 3314 err = register_filesystem(&ext4dev_fs_type); 3315 if (err) 3316 goto out; 3317 return 0; 3318 out: 3319 destroy_inodecache(); 3320 out1: 3321 exit_ext4_xattr(); 3322 out2: 3323 exit_ext4_mballoc(); 3324 return err; 3325 } 3326 3327 static void __exit exit_ext4_fs(void) 3328 { 3329 unregister_filesystem(&ext4dev_fs_type); 3330 destroy_inodecache(); 3331 exit_ext4_xattr(); 3332 exit_ext4_mballoc(); 3333 } 3334 3335 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); 3336 MODULE_DESCRIPTION("Fourth Extended Filesystem with extents"); 3337 MODULE_LICENSE("GPL"); 3338 module_init(init_ext4_fs) 3339 module_exit(exit_ext4_fs) 3340