1 /* 2 * linux/fs/ext4/super.c 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/fs/minix/inode.c 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 * 15 * Big-endian to little-endian byte-swapping/bitmaps by 16 * David S. Miller (davem@caip.rutgers.edu), 1995 17 */ 18 19 #include <linux/module.h> 20 #include <linux/string.h> 21 #include <linux/fs.h> 22 #include <linux/time.h> 23 #include <linux/jbd2.h> 24 #include <linux/ext4_fs.h> 25 #include <linux/ext4_jbd2.h> 26 #include <linux/slab.h> 27 #include <linux/init.h> 28 #include <linux/blkdev.h> 29 #include <linux/parser.h> 30 #include <linux/smp_lock.h> 31 #include <linux/buffer_head.h> 32 #include <linux/exportfs.h> 33 #include <linux/vfs.h> 34 #include <linux/random.h> 35 #include <linux/mount.h> 36 #include <linux/namei.h> 37 #include <linux/quotaops.h> 38 #include <linux/seq_file.h> 39 #include <linux/log2.h> 40 #include <linux/crc16.h> 41 42 #include <asm/uaccess.h> 43 44 #include "xattr.h" 45 #include "acl.h" 46 #include "namei.h" 47 #include "group.h" 48 49 static int ext4_load_journal(struct super_block *, struct ext4_super_block *, 50 unsigned long journal_devnum); 51 static int ext4_create_journal(struct super_block *, struct ext4_super_block *, 52 unsigned int); 53 static void ext4_commit_super (struct super_block * sb, 54 struct ext4_super_block * es, 55 int sync); 56 static void ext4_mark_recovery_complete(struct super_block * sb, 57 struct ext4_super_block * es); 58 static void ext4_clear_journal_err(struct super_block * sb, 59 struct ext4_super_block * es); 60 static int ext4_sync_fs(struct super_block *sb, int wait); 61 static const char *ext4_decode_error(struct super_block * sb, int errno, 62 char nbuf[16]); 63 static int ext4_remount (struct super_block * sb, int * flags, char * data); 64 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf); 65 static void ext4_unlockfs(struct super_block *sb); 66 static void ext4_write_super (struct super_block * sb); 67 static void ext4_write_super_lockfs(struct super_block *sb); 68 69 70 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 71 struct ext4_group_desc *bg) 72 { 73 return le32_to_cpu(bg->bg_block_bitmap_lo) | 74 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 75 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); 76 } 77 78 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 79 struct ext4_group_desc *bg) 80 { 81 return le32_to_cpu(bg->bg_inode_bitmap_lo) | 82 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 83 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); 84 } 85 86 ext4_fsblk_t ext4_inode_table(struct super_block *sb, 87 struct ext4_group_desc *bg) 88 { 89 return le32_to_cpu(bg->bg_inode_table_lo) | 90 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 91 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); 92 } 93 94 void ext4_block_bitmap_set(struct super_block *sb, 95 struct ext4_group_desc *bg, ext4_fsblk_t blk) 96 { 97 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); 98 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 99 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); 100 } 101 102 void ext4_inode_bitmap_set(struct super_block *sb, 103 struct ext4_group_desc *bg, ext4_fsblk_t blk) 104 { 105 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); 106 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 107 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); 108 } 109 110 void ext4_inode_table_set(struct super_block *sb, 111 struct ext4_group_desc *bg, ext4_fsblk_t blk) 112 { 113 bg->bg_inode_table_lo = cpu_to_le32((u32)blk); 114 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 115 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); 116 } 117 118 /* 119 * Wrappers for jbd2_journal_start/end. 120 * 121 * The only special thing we need to do here is to make sure that all 122 * journal_end calls result in the superblock being marked dirty, so 123 * that sync() will call the filesystem's write_super callback if 124 * appropriate. 125 */ 126 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) 127 { 128 journal_t *journal; 129 130 if (sb->s_flags & MS_RDONLY) 131 return ERR_PTR(-EROFS); 132 133 /* Special case here: if the journal has aborted behind our 134 * backs (eg. EIO in the commit thread), then we still need to 135 * take the FS itself readonly cleanly. */ 136 journal = EXT4_SB(sb)->s_journal; 137 if (is_journal_aborted(journal)) { 138 ext4_abort(sb, __FUNCTION__, 139 "Detected aborted journal"); 140 return ERR_PTR(-EROFS); 141 } 142 143 return jbd2_journal_start(journal, nblocks); 144 } 145 146 /* 147 * The only special thing we need to do here is to make sure that all 148 * jbd2_journal_stop calls result in the superblock being marked dirty, so 149 * that sync() will call the filesystem's write_super callback if 150 * appropriate. 151 */ 152 int __ext4_journal_stop(const char *where, handle_t *handle) 153 { 154 struct super_block *sb; 155 int err; 156 int rc; 157 158 sb = handle->h_transaction->t_journal->j_private; 159 err = handle->h_err; 160 rc = jbd2_journal_stop(handle); 161 162 if (!err) 163 err = rc; 164 if (err) 165 __ext4_std_error(sb, where, err); 166 return err; 167 } 168 169 void ext4_journal_abort_handle(const char *caller, const char *err_fn, 170 struct buffer_head *bh, handle_t *handle, int err) 171 { 172 char nbuf[16]; 173 const char *errstr = ext4_decode_error(NULL, err, nbuf); 174 175 if (bh) 176 BUFFER_TRACE(bh, "abort"); 177 178 if (!handle->h_err) 179 handle->h_err = err; 180 181 if (is_handle_aborted(handle)) 182 return; 183 184 printk(KERN_ERR "%s: aborting transaction: %s in %s\n", 185 caller, errstr, err_fn); 186 187 jbd2_journal_abort_handle(handle); 188 } 189 190 /* Deal with the reporting of failure conditions on a filesystem such as 191 * inconsistencies detected or read IO failures. 192 * 193 * On ext2, we can store the error state of the filesystem in the 194 * superblock. That is not possible on ext4, because we may have other 195 * write ordering constraints on the superblock which prevent us from 196 * writing it out straight away; and given that the journal is about to 197 * be aborted, we can't rely on the current, or future, transactions to 198 * write out the superblock safely. 199 * 200 * We'll just use the jbd2_journal_abort() error code to record an error in 201 * the journal instead. On recovery, the journal will compain about 202 * that error until we've noted it down and cleared it. 203 */ 204 205 static void ext4_handle_error(struct super_block *sb) 206 { 207 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 208 209 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 210 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 211 212 if (sb->s_flags & MS_RDONLY) 213 return; 214 215 if (!test_opt (sb, ERRORS_CONT)) { 216 journal_t *journal = EXT4_SB(sb)->s_journal; 217 218 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; 219 if (journal) 220 jbd2_journal_abort(journal, -EIO); 221 } 222 if (test_opt (sb, ERRORS_RO)) { 223 printk (KERN_CRIT "Remounting filesystem read-only\n"); 224 sb->s_flags |= MS_RDONLY; 225 } 226 ext4_commit_super(sb, es, 1); 227 if (test_opt(sb, ERRORS_PANIC)) 228 panic("EXT4-fs (device %s): panic forced after error\n", 229 sb->s_id); 230 } 231 232 void ext4_error (struct super_block * sb, const char * function, 233 const char * fmt, ...) 234 { 235 va_list args; 236 237 va_start(args, fmt); 238 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function); 239 vprintk(fmt, args); 240 printk("\n"); 241 va_end(args); 242 243 ext4_handle_error(sb); 244 } 245 246 static const char *ext4_decode_error(struct super_block * sb, int errno, 247 char nbuf[16]) 248 { 249 char *errstr = NULL; 250 251 switch (errno) { 252 case -EIO: 253 errstr = "IO failure"; 254 break; 255 case -ENOMEM: 256 errstr = "Out of memory"; 257 break; 258 case -EROFS: 259 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT) 260 errstr = "Journal has aborted"; 261 else 262 errstr = "Readonly filesystem"; 263 break; 264 default: 265 /* If the caller passed in an extra buffer for unknown 266 * errors, textualise them now. Else we just return 267 * NULL. */ 268 if (nbuf) { 269 /* Check for truncated error codes... */ 270 if (snprintf(nbuf, 16, "error %d", -errno) >= 0) 271 errstr = nbuf; 272 } 273 break; 274 } 275 276 return errstr; 277 } 278 279 /* __ext4_std_error decodes expected errors from journaling functions 280 * automatically and invokes the appropriate error response. */ 281 282 void __ext4_std_error (struct super_block * sb, const char * function, 283 int errno) 284 { 285 char nbuf[16]; 286 const char *errstr; 287 288 /* Special case: if the error is EROFS, and we're not already 289 * inside a transaction, then there's really no point in logging 290 * an error. */ 291 if (errno == -EROFS && journal_current_handle() == NULL && 292 (sb->s_flags & MS_RDONLY)) 293 return; 294 295 errstr = ext4_decode_error(sb, errno, nbuf); 296 printk (KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n", 297 sb->s_id, function, errstr); 298 299 ext4_handle_error(sb); 300 } 301 302 /* 303 * ext4_abort is a much stronger failure handler than ext4_error. The 304 * abort function may be used to deal with unrecoverable failures such 305 * as journal IO errors or ENOMEM at a critical moment in log management. 306 * 307 * We unconditionally force the filesystem into an ABORT|READONLY state, 308 * unless the error response on the fs has been set to panic in which 309 * case we take the easy way out and panic immediately. 310 */ 311 312 void ext4_abort (struct super_block * sb, const char * function, 313 const char * fmt, ...) 314 { 315 va_list args; 316 317 printk (KERN_CRIT "ext4_abort called.\n"); 318 319 va_start(args, fmt); 320 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function); 321 vprintk(fmt, args); 322 printk("\n"); 323 va_end(args); 324 325 if (test_opt(sb, ERRORS_PANIC)) 326 panic("EXT4-fs panic from previous error\n"); 327 328 if (sb->s_flags & MS_RDONLY) 329 return; 330 331 printk(KERN_CRIT "Remounting filesystem read-only\n"); 332 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 333 sb->s_flags |= MS_RDONLY; 334 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; 335 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); 336 } 337 338 void ext4_warning (struct super_block * sb, const char * function, 339 const char * fmt, ...) 340 { 341 va_list args; 342 343 va_start(args, fmt); 344 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ", 345 sb->s_id, function); 346 vprintk(fmt, args); 347 printk("\n"); 348 va_end(args); 349 } 350 351 void ext4_update_dynamic_rev(struct super_block *sb) 352 { 353 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 354 355 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) 356 return; 357 358 ext4_warning(sb, __FUNCTION__, 359 "updating to rev %d because of new feature flag, " 360 "running e2fsck is recommended", 361 EXT4_DYNAMIC_REV); 362 363 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); 364 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); 365 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); 366 /* leave es->s_feature_*compat flags alone */ 367 /* es->s_uuid will be set by e2fsck if empty */ 368 369 /* 370 * The rest of the superblock fields should be zero, and if not it 371 * means they are likely already in use, so leave them alone. We 372 * can leave it up to e2fsck to clean up any inconsistencies there. 373 */ 374 } 375 376 int ext4_update_compat_feature(handle_t *handle, 377 struct super_block *sb, __u32 compat) 378 { 379 int err = 0; 380 if (!EXT4_HAS_COMPAT_FEATURE(sb, compat)) { 381 err = ext4_journal_get_write_access(handle, 382 EXT4_SB(sb)->s_sbh); 383 if (err) 384 return err; 385 EXT4_SET_COMPAT_FEATURE(sb, compat); 386 sb->s_dirt = 1; 387 handle->h_sync = 1; 388 BUFFER_TRACE(EXT4_SB(sb)->s_sbh, 389 "call ext4_journal_dirty_met adata"); 390 err = ext4_journal_dirty_metadata(handle, 391 EXT4_SB(sb)->s_sbh); 392 } 393 return err; 394 } 395 396 int ext4_update_rocompat_feature(handle_t *handle, 397 struct super_block *sb, __u32 rocompat) 398 { 399 int err = 0; 400 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, rocompat)) { 401 err = ext4_journal_get_write_access(handle, 402 EXT4_SB(sb)->s_sbh); 403 if (err) 404 return err; 405 EXT4_SET_RO_COMPAT_FEATURE(sb, rocompat); 406 sb->s_dirt = 1; 407 handle->h_sync = 1; 408 BUFFER_TRACE(EXT4_SB(sb)->s_sbh, 409 "call ext4_journal_dirty_met adata"); 410 err = ext4_journal_dirty_metadata(handle, 411 EXT4_SB(sb)->s_sbh); 412 } 413 return err; 414 } 415 416 int ext4_update_incompat_feature(handle_t *handle, 417 struct super_block *sb, __u32 incompat) 418 { 419 int err = 0; 420 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, incompat)) { 421 err = ext4_journal_get_write_access(handle, 422 EXT4_SB(sb)->s_sbh); 423 if (err) 424 return err; 425 EXT4_SET_INCOMPAT_FEATURE(sb, incompat); 426 sb->s_dirt = 1; 427 handle->h_sync = 1; 428 BUFFER_TRACE(EXT4_SB(sb)->s_sbh, 429 "call ext4_journal_dirty_met adata"); 430 err = ext4_journal_dirty_metadata(handle, 431 EXT4_SB(sb)->s_sbh); 432 } 433 return err; 434 } 435 436 /* 437 * Open the external journal device 438 */ 439 static struct block_device *ext4_blkdev_get(dev_t dev) 440 { 441 struct block_device *bdev; 442 char b[BDEVNAME_SIZE]; 443 444 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); 445 if (IS_ERR(bdev)) 446 goto fail; 447 return bdev; 448 449 fail: 450 printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n", 451 __bdevname(dev, b), PTR_ERR(bdev)); 452 return NULL; 453 } 454 455 /* 456 * Release the journal device 457 */ 458 static int ext4_blkdev_put(struct block_device *bdev) 459 { 460 bd_release(bdev); 461 return blkdev_put(bdev); 462 } 463 464 static int ext4_blkdev_remove(struct ext4_sb_info *sbi) 465 { 466 struct block_device *bdev; 467 int ret = -ENODEV; 468 469 bdev = sbi->journal_bdev; 470 if (bdev) { 471 ret = ext4_blkdev_put(bdev); 472 sbi->journal_bdev = NULL; 473 } 474 return ret; 475 } 476 477 static inline struct inode *orphan_list_entry(struct list_head *l) 478 { 479 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; 480 } 481 482 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) 483 { 484 struct list_head *l; 485 486 printk(KERN_ERR "sb orphan head is %d\n", 487 le32_to_cpu(sbi->s_es->s_last_orphan)); 488 489 printk(KERN_ERR "sb_info orphan list:\n"); 490 list_for_each(l, &sbi->s_orphan) { 491 struct inode *inode = orphan_list_entry(l); 492 printk(KERN_ERR " " 493 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", 494 inode->i_sb->s_id, inode->i_ino, inode, 495 inode->i_mode, inode->i_nlink, 496 NEXT_ORPHAN(inode)); 497 } 498 } 499 500 static void ext4_put_super (struct super_block * sb) 501 { 502 struct ext4_sb_info *sbi = EXT4_SB(sb); 503 struct ext4_super_block *es = sbi->s_es; 504 int i; 505 506 ext4_mb_release(sb); 507 ext4_ext_release(sb); 508 ext4_xattr_put_super(sb); 509 jbd2_journal_destroy(sbi->s_journal); 510 if (!(sb->s_flags & MS_RDONLY)) { 511 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 512 es->s_state = cpu_to_le16(sbi->s_mount_state); 513 BUFFER_TRACE(sbi->s_sbh, "marking dirty"); 514 mark_buffer_dirty(sbi->s_sbh); 515 ext4_commit_super(sb, es, 1); 516 } 517 518 for (i = 0; i < sbi->s_gdb_count; i++) 519 brelse(sbi->s_group_desc[i]); 520 kfree(sbi->s_group_desc); 521 percpu_counter_destroy(&sbi->s_freeblocks_counter); 522 percpu_counter_destroy(&sbi->s_freeinodes_counter); 523 percpu_counter_destroy(&sbi->s_dirs_counter); 524 brelse(sbi->s_sbh); 525 #ifdef CONFIG_QUOTA 526 for (i = 0; i < MAXQUOTAS; i++) 527 kfree(sbi->s_qf_names[i]); 528 #endif 529 530 /* Debugging code just in case the in-memory inode orphan list 531 * isn't empty. The on-disk one can be non-empty if we've 532 * detected an error and taken the fs readonly, but the 533 * in-memory list had better be clean by this point. */ 534 if (!list_empty(&sbi->s_orphan)) 535 dump_orphan_list(sb, sbi); 536 J_ASSERT(list_empty(&sbi->s_orphan)); 537 538 invalidate_bdev(sb->s_bdev); 539 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { 540 /* 541 * Invalidate the journal device's buffers. We don't want them 542 * floating about in memory - the physical journal device may 543 * hotswapped, and it breaks the `ro-after' testing code. 544 */ 545 sync_blockdev(sbi->journal_bdev); 546 invalidate_bdev(sbi->journal_bdev); 547 ext4_blkdev_remove(sbi); 548 } 549 sb->s_fs_info = NULL; 550 kfree(sbi); 551 return; 552 } 553 554 static struct kmem_cache *ext4_inode_cachep; 555 556 /* 557 * Called inside transaction, so use GFP_NOFS 558 */ 559 static struct inode *ext4_alloc_inode(struct super_block *sb) 560 { 561 struct ext4_inode_info *ei; 562 563 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); 564 if (!ei) 565 return NULL; 566 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 567 ei->i_acl = EXT4_ACL_NOT_CACHED; 568 ei->i_default_acl = EXT4_ACL_NOT_CACHED; 569 #endif 570 ei->i_block_alloc_info = NULL; 571 ei->vfs_inode.i_version = 1; 572 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); 573 INIT_LIST_HEAD(&ei->i_prealloc_list); 574 spin_lock_init(&ei->i_prealloc_lock); 575 return &ei->vfs_inode; 576 } 577 578 static void ext4_destroy_inode(struct inode *inode) 579 { 580 if (!list_empty(&(EXT4_I(inode)->i_orphan))) { 581 printk("EXT4 Inode %p: orphan list check failed!\n", 582 EXT4_I(inode)); 583 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, 584 EXT4_I(inode), sizeof(struct ext4_inode_info), 585 true); 586 dump_stack(); 587 } 588 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); 589 } 590 591 static void init_once(struct kmem_cache *cachep, void *foo) 592 { 593 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; 594 595 INIT_LIST_HEAD(&ei->i_orphan); 596 #ifdef CONFIG_EXT4DEV_FS_XATTR 597 init_rwsem(&ei->xattr_sem); 598 #endif 599 init_rwsem(&ei->i_data_sem); 600 inode_init_once(&ei->vfs_inode); 601 } 602 603 static int init_inodecache(void) 604 { 605 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", 606 sizeof(struct ext4_inode_info), 607 0, (SLAB_RECLAIM_ACCOUNT| 608 SLAB_MEM_SPREAD), 609 init_once); 610 if (ext4_inode_cachep == NULL) 611 return -ENOMEM; 612 return 0; 613 } 614 615 static void destroy_inodecache(void) 616 { 617 kmem_cache_destroy(ext4_inode_cachep); 618 } 619 620 static void ext4_clear_inode(struct inode *inode) 621 { 622 struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info; 623 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 624 if (EXT4_I(inode)->i_acl && 625 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) { 626 posix_acl_release(EXT4_I(inode)->i_acl); 627 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED; 628 } 629 if (EXT4_I(inode)->i_default_acl && 630 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) { 631 posix_acl_release(EXT4_I(inode)->i_default_acl); 632 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED; 633 } 634 #endif 635 ext4_discard_reservation(inode); 636 EXT4_I(inode)->i_block_alloc_info = NULL; 637 if (unlikely(rsv)) 638 kfree(rsv); 639 } 640 641 static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb) 642 { 643 #if defined(CONFIG_QUOTA) 644 struct ext4_sb_info *sbi = EXT4_SB(sb); 645 646 if (sbi->s_jquota_fmt) 647 seq_printf(seq, ",jqfmt=%s", 648 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0"); 649 650 if (sbi->s_qf_names[USRQUOTA]) 651 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); 652 653 if (sbi->s_qf_names[GRPQUOTA]) 654 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); 655 656 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) 657 seq_puts(seq, ",usrquota"); 658 659 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) 660 seq_puts(seq, ",grpquota"); 661 #endif 662 } 663 664 /* 665 * Show an option if 666 * - it's set to a non-default value OR 667 * - if the per-sb default is different from the global default 668 */ 669 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs) 670 { 671 int def_errors; 672 unsigned long def_mount_opts; 673 struct super_block *sb = vfs->mnt_sb; 674 struct ext4_sb_info *sbi = EXT4_SB(sb); 675 struct ext4_super_block *es = sbi->s_es; 676 677 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 678 def_errors = le16_to_cpu(es->s_errors); 679 680 if (sbi->s_sb_block != 1) 681 seq_printf(seq, ",sb=%llu", sbi->s_sb_block); 682 if (test_opt(sb, MINIX_DF)) 683 seq_puts(seq, ",minixdf"); 684 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS)) 685 seq_puts(seq, ",grpid"); 686 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS)) 687 seq_puts(seq, ",nogrpid"); 688 if (sbi->s_resuid != EXT4_DEF_RESUID || 689 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) { 690 seq_printf(seq, ",resuid=%u", sbi->s_resuid); 691 } 692 if (sbi->s_resgid != EXT4_DEF_RESGID || 693 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) { 694 seq_printf(seq, ",resgid=%u", sbi->s_resgid); 695 } 696 if (test_opt(sb, ERRORS_RO)) { 697 if (def_errors == EXT4_ERRORS_PANIC || 698 def_errors == EXT4_ERRORS_CONTINUE) { 699 seq_puts(seq, ",errors=remount-ro"); 700 } 701 } 702 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) 703 seq_puts(seq, ",errors=continue"); 704 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) 705 seq_puts(seq, ",errors=panic"); 706 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16)) 707 seq_puts(seq, ",nouid32"); 708 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG)) 709 seq_puts(seq, ",debug"); 710 if (test_opt(sb, OLDALLOC)) 711 seq_puts(seq, ",oldalloc"); 712 #ifdef CONFIG_EXT4DEV_FS_XATTR 713 if (test_opt(sb, XATTR_USER) && 714 !(def_mount_opts & EXT4_DEFM_XATTR_USER)) 715 seq_puts(seq, ",user_xattr"); 716 if (!test_opt(sb, XATTR_USER) && 717 (def_mount_opts & EXT4_DEFM_XATTR_USER)) { 718 seq_puts(seq, ",nouser_xattr"); 719 } 720 #endif 721 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 722 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL)) 723 seq_puts(seq, ",acl"); 724 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL)) 725 seq_puts(seq, ",noacl"); 726 #endif 727 if (!test_opt(sb, RESERVATION)) 728 seq_puts(seq, ",noreservation"); 729 if (sbi->s_commit_interval) { 730 seq_printf(seq, ",commit=%u", 731 (unsigned) (sbi->s_commit_interval / HZ)); 732 } 733 if (test_opt(sb, BARRIER)) 734 seq_puts(seq, ",barrier=1"); 735 if (test_opt(sb, NOBH)) 736 seq_puts(seq, ",nobh"); 737 if (!test_opt(sb, EXTENTS)) 738 seq_puts(seq, ",noextents"); 739 if (!test_opt(sb, MBALLOC)) 740 seq_puts(seq, ",nomballoc"); 741 if (test_opt(sb, I_VERSION)) 742 seq_puts(seq, ",i_version"); 743 744 if (sbi->s_stripe) 745 seq_printf(seq, ",stripe=%lu", sbi->s_stripe); 746 /* 747 * journal mode get enabled in different ways 748 * So just print the value even if we didn't specify it 749 */ 750 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 751 seq_puts(seq, ",data=journal"); 752 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 753 seq_puts(seq, ",data=ordered"); 754 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) 755 seq_puts(seq, ",data=writeback"); 756 757 ext4_show_quota_options(seq, sb); 758 return 0; 759 } 760 761 762 static struct inode *ext4_nfs_get_inode(struct super_block *sb, 763 u64 ino, u32 generation) 764 { 765 struct inode *inode; 766 767 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) 768 return ERR_PTR(-ESTALE); 769 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) 770 return ERR_PTR(-ESTALE); 771 772 /* iget isn't really right if the inode is currently unallocated!! 773 * 774 * ext4_read_inode will return a bad_inode if the inode had been 775 * deleted, so we should be safe. 776 * 777 * Currently we don't know the generation for parent directory, so 778 * a generation of 0 means "accept any" 779 */ 780 inode = ext4_iget(sb, ino); 781 if (IS_ERR(inode)) 782 return ERR_CAST(inode); 783 if (generation && inode->i_generation != generation) { 784 iput(inode); 785 return ERR_PTR(-ESTALE); 786 } 787 788 return inode; 789 } 790 791 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, 792 int fh_len, int fh_type) 793 { 794 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 795 ext4_nfs_get_inode); 796 } 797 798 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, 799 int fh_len, int fh_type) 800 { 801 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 802 ext4_nfs_get_inode); 803 } 804 805 #ifdef CONFIG_QUOTA 806 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group") 807 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) 808 809 static int ext4_dquot_initialize(struct inode *inode, int type); 810 static int ext4_dquot_drop(struct inode *inode); 811 static int ext4_write_dquot(struct dquot *dquot); 812 static int ext4_acquire_dquot(struct dquot *dquot); 813 static int ext4_release_dquot(struct dquot *dquot); 814 static int ext4_mark_dquot_dirty(struct dquot *dquot); 815 static int ext4_write_info(struct super_block *sb, int type); 816 static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path); 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_err, NULL}, 948 {Opt_resize, "resize"}, 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(le16_to_cpu(es->s_state) & ~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 es->s_mnt_count=cpu_to_le16(le16_to_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 ext4_error (sb, "ext4_check_descriptors", 1488 "Block bitmap for group %lu" 1489 " not in group (block %llu)!", 1490 i, block_bitmap); 1491 return 0; 1492 } 1493 inode_bitmap = ext4_inode_bitmap(sb, gdp); 1494 if (inode_bitmap < first_block || inode_bitmap > last_block) 1495 { 1496 ext4_error (sb, "ext4_check_descriptors", 1497 "Inode bitmap for group %lu" 1498 " not in group (block %llu)!", 1499 i, inode_bitmap); 1500 return 0; 1501 } 1502 inode_table = ext4_inode_table(sb, gdp); 1503 if (inode_table < first_block || 1504 inode_table + sbi->s_itb_per_group - 1 > last_block) 1505 { 1506 ext4_error (sb, "ext4_check_descriptors", 1507 "Inode table for group %lu" 1508 " not in group (block %llu)!", 1509 i, inode_table); 1510 return 0; 1511 } 1512 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) { 1513 ext4_error(sb, __FUNCTION__, 1514 "Checksum for group %lu failed (%u!=%u)\n", 1515 i, le16_to_cpu(ext4_group_desc_csum(sbi, i, 1516 gdp)), le16_to_cpu(gdp->bg_checksum)); 1517 return 0; 1518 } 1519 if (!flexbg_flag) 1520 first_block += EXT4_BLOCKS_PER_GROUP(sb); 1521 } 1522 1523 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb)); 1524 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb)); 1525 return 1; 1526 } 1527 1528 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at 1529 * the superblock) which were deleted from all directories, but held open by 1530 * a process at the time of a crash. We walk the list and try to delete these 1531 * inodes at recovery time (only with a read-write filesystem). 1532 * 1533 * In order to keep the orphan inode chain consistent during traversal (in 1534 * case of crash during recovery), we link each inode into the superblock 1535 * orphan list_head and handle it the same way as an inode deletion during 1536 * normal operation (which journals the operations for us). 1537 * 1538 * We only do an iget() and an iput() on each inode, which is very safe if we 1539 * accidentally point at an in-use or already deleted inode. The worst that 1540 * can happen in this case is that we get a "bit already cleared" message from 1541 * ext4_free_inode(). The only reason we would point at a wrong inode is if 1542 * e2fsck was run on this filesystem, and it must have already done the orphan 1543 * inode cleanup for us, so we can safely abort without any further action. 1544 */ 1545 static void ext4_orphan_cleanup (struct super_block * sb, 1546 struct ext4_super_block * es) 1547 { 1548 unsigned int s_flags = sb->s_flags; 1549 int nr_orphans = 0, nr_truncates = 0; 1550 #ifdef CONFIG_QUOTA 1551 int i; 1552 #endif 1553 if (!es->s_last_orphan) { 1554 jbd_debug(4, "no orphan inodes to clean up\n"); 1555 return; 1556 } 1557 1558 if (bdev_read_only(sb->s_bdev)) { 1559 printk(KERN_ERR "EXT4-fs: write access " 1560 "unavailable, skipping orphan cleanup.\n"); 1561 return; 1562 } 1563 1564 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { 1565 if (es->s_last_orphan) 1566 jbd_debug(1, "Errors on filesystem, " 1567 "clearing orphan list.\n"); 1568 es->s_last_orphan = 0; 1569 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); 1570 return; 1571 } 1572 1573 if (s_flags & MS_RDONLY) { 1574 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n", 1575 sb->s_id); 1576 sb->s_flags &= ~MS_RDONLY; 1577 } 1578 #ifdef CONFIG_QUOTA 1579 /* Needed for iput() to work correctly and not trash data */ 1580 sb->s_flags |= MS_ACTIVE; 1581 /* Turn on quotas so that they are updated correctly */ 1582 for (i = 0; i < MAXQUOTAS; i++) { 1583 if (EXT4_SB(sb)->s_qf_names[i]) { 1584 int ret = ext4_quota_on_mount(sb, i); 1585 if (ret < 0) 1586 printk(KERN_ERR 1587 "EXT4-fs: Cannot turn on journalled " 1588 "quota: error %d\n", ret); 1589 } 1590 } 1591 #endif 1592 1593 while (es->s_last_orphan) { 1594 struct inode *inode; 1595 1596 if (!(inode = 1597 ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) { 1598 es->s_last_orphan = 0; 1599 break; 1600 } 1601 1602 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); 1603 DQUOT_INIT(inode); 1604 if (inode->i_nlink) { 1605 printk(KERN_DEBUG 1606 "%s: truncating inode %lu to %Ld bytes\n", 1607 __FUNCTION__, inode->i_ino, inode->i_size); 1608 jbd_debug(2, "truncating inode %lu to %Ld bytes\n", 1609 inode->i_ino, inode->i_size); 1610 ext4_truncate(inode); 1611 nr_truncates++; 1612 } else { 1613 printk(KERN_DEBUG 1614 "%s: deleting unreferenced inode %lu\n", 1615 __FUNCTION__, inode->i_ino); 1616 jbd_debug(2, "deleting unreferenced inode %lu\n", 1617 inode->i_ino); 1618 nr_orphans++; 1619 } 1620 iput(inode); /* The delete magic happens here! */ 1621 } 1622 1623 #define PLURAL(x) (x), ((x)==1) ? "" : "s" 1624 1625 if (nr_orphans) 1626 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n", 1627 sb->s_id, PLURAL(nr_orphans)); 1628 if (nr_truncates) 1629 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n", 1630 sb->s_id, PLURAL(nr_truncates)); 1631 #ifdef CONFIG_QUOTA 1632 /* Turn quotas off */ 1633 for (i = 0; i < MAXQUOTAS; i++) { 1634 if (sb_dqopt(sb)->files[i]) 1635 vfs_quota_off(sb, i); 1636 } 1637 #endif 1638 sb->s_flags = s_flags; /* Restore MS_RDONLY status */ 1639 } 1640 /* 1641 * Maximal extent format file size. 1642 * Resulting logical blkno at s_maxbytes must fit in our on-disk 1643 * extent format containers, within a sector_t, and within i_blocks 1644 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, 1645 * so that won't be a limiting factor. 1646 * 1647 * Note, this does *not* consider any metadata overhead for vfs i_blocks. 1648 */ 1649 static loff_t ext4_max_size(int blkbits) 1650 { 1651 loff_t res; 1652 loff_t upper_limit = MAX_LFS_FILESIZE; 1653 1654 /* small i_blocks in vfs inode? */ 1655 if (sizeof(blkcnt_t) < sizeof(u64)) { 1656 /* 1657 * CONFIG_LSF is not enabled implies the inode 1658 * i_block represent total blocks in 512 bytes 1659 * 32 == size of vfs inode i_blocks * 8 1660 */ 1661 upper_limit = (1LL << 32) - 1; 1662 1663 /* total blocks in file system block size */ 1664 upper_limit >>= (blkbits - 9); 1665 upper_limit <<= blkbits; 1666 } 1667 1668 /* 32-bit extent-start container, ee_block */ 1669 res = 1LL << 32; 1670 res <<= blkbits; 1671 res -= 1; 1672 1673 /* Sanity check against vm- & vfs- imposed limits */ 1674 if (res > upper_limit) 1675 res = upper_limit; 1676 1677 return res; 1678 } 1679 1680 /* 1681 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect 1682 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. 1683 * We need to be 1 filesystem block less than the 2^48 sector limit. 1684 */ 1685 static loff_t ext4_max_bitmap_size(int bits) 1686 { 1687 loff_t res = EXT4_NDIR_BLOCKS; 1688 int meta_blocks; 1689 loff_t upper_limit; 1690 /* This is calculated to be the largest file size for a 1691 * dense, bitmapped file such that the total number of 1692 * sectors in the file, including data and all indirect blocks, 1693 * does not exceed 2^48 -1 1694 * __u32 i_blocks_lo and _u16 i_blocks_high representing the 1695 * total number of 512 bytes blocks of the file 1696 */ 1697 1698 if (sizeof(blkcnt_t) < sizeof(u64)) { 1699 /* 1700 * CONFIG_LSF is not enabled implies the inode 1701 * i_block represent total blocks in 512 bytes 1702 * 32 == size of vfs inode i_blocks * 8 1703 */ 1704 upper_limit = (1LL << 32) - 1; 1705 1706 /* total blocks in file system block size */ 1707 upper_limit >>= (bits - 9); 1708 1709 } else { 1710 /* 1711 * We use 48 bit ext4_inode i_blocks 1712 * With EXT4_HUGE_FILE_FL set the i_blocks 1713 * represent total number of blocks in 1714 * file system block size 1715 */ 1716 upper_limit = (1LL << 48) - 1; 1717 1718 } 1719 1720 /* indirect blocks */ 1721 meta_blocks = 1; 1722 /* double indirect blocks */ 1723 meta_blocks += 1 + (1LL << (bits-2)); 1724 /* tripple indirect blocks */ 1725 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); 1726 1727 upper_limit -= meta_blocks; 1728 upper_limit <<= bits; 1729 1730 res += 1LL << (bits-2); 1731 res += 1LL << (2*(bits-2)); 1732 res += 1LL << (3*(bits-2)); 1733 res <<= bits; 1734 if (res > upper_limit) 1735 res = upper_limit; 1736 1737 if (res > MAX_LFS_FILESIZE) 1738 res = MAX_LFS_FILESIZE; 1739 1740 return res; 1741 } 1742 1743 static ext4_fsblk_t descriptor_loc(struct super_block *sb, 1744 ext4_fsblk_t logical_sb_block, int nr) 1745 { 1746 struct ext4_sb_info *sbi = EXT4_SB(sb); 1747 ext4_group_t bg, first_meta_bg; 1748 int has_super = 0; 1749 1750 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 1751 1752 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || 1753 nr < first_meta_bg) 1754 return logical_sb_block + nr + 1; 1755 bg = sbi->s_desc_per_block * nr; 1756 if (ext4_bg_has_super(sb, bg)) 1757 has_super = 1; 1758 return (has_super + ext4_group_first_block_no(sb, bg)); 1759 } 1760 1761 /** 1762 * ext4_get_stripe_size: Get the stripe size. 1763 * @sbi: In memory super block info 1764 * 1765 * If we have specified it via mount option, then 1766 * use the mount option value. If the value specified at mount time is 1767 * greater than the blocks per group use the super block value. 1768 * If the super block value is greater than blocks per group return 0. 1769 * Allocator needs it be less than blocks per group. 1770 * 1771 */ 1772 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) 1773 { 1774 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); 1775 unsigned long stripe_width = 1776 le32_to_cpu(sbi->s_es->s_raid_stripe_width); 1777 1778 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) 1779 return sbi->s_stripe; 1780 1781 if (stripe_width <= sbi->s_blocks_per_group) 1782 return stripe_width; 1783 1784 if (stride <= sbi->s_blocks_per_group) 1785 return stride; 1786 1787 return 0; 1788 } 1789 1790 static int ext4_fill_super (struct super_block *sb, void *data, int silent) 1791 __releases(kernel_sem) 1792 __acquires(kernel_sem) 1793 1794 { 1795 struct buffer_head * bh; 1796 struct ext4_super_block *es = NULL; 1797 struct ext4_sb_info *sbi; 1798 ext4_fsblk_t block; 1799 ext4_fsblk_t sb_block = get_sb_block(&data); 1800 ext4_fsblk_t logical_sb_block; 1801 unsigned long offset = 0; 1802 unsigned int journal_inum = 0; 1803 unsigned long journal_devnum = 0; 1804 unsigned long def_mount_opts; 1805 struct inode *root; 1806 int ret = -EINVAL; 1807 int blocksize; 1808 int db_count; 1809 int i; 1810 int needs_recovery; 1811 __le32 features; 1812 __u64 blocks_count; 1813 int err; 1814 1815 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 1816 if (!sbi) 1817 return -ENOMEM; 1818 sb->s_fs_info = sbi; 1819 sbi->s_mount_opt = 0; 1820 sbi->s_resuid = EXT4_DEF_RESUID; 1821 sbi->s_resgid = EXT4_DEF_RESGID; 1822 sbi->s_sb_block = sb_block; 1823 1824 unlock_kernel(); 1825 1826 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); 1827 if (!blocksize) { 1828 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n"); 1829 goto out_fail; 1830 } 1831 1832 if (!sb_set_blocksize(sb, blocksize)) { 1833 printk(KERN_ERR "EXT4-fs: bad blocksize %d.\n", blocksize); 1834 goto out_fail; 1835 } 1836 1837 /* 1838 * The ext4 superblock will not be buffer aligned for other than 1kB 1839 * block sizes. We need to calculate the offset from buffer start. 1840 */ 1841 if (blocksize != EXT4_MIN_BLOCK_SIZE) { 1842 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 1843 offset = do_div(logical_sb_block, blocksize); 1844 } else { 1845 logical_sb_block = sb_block; 1846 } 1847 1848 if (!(bh = sb_bread(sb, logical_sb_block))) { 1849 printk (KERN_ERR "EXT4-fs: unable to read superblock\n"); 1850 goto out_fail; 1851 } 1852 /* 1853 * Note: s_es must be initialized as soon as possible because 1854 * some ext4 macro-instructions depend on its value 1855 */ 1856 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 1857 sbi->s_es = es; 1858 sb->s_magic = le16_to_cpu(es->s_magic); 1859 if (sb->s_magic != EXT4_SUPER_MAGIC) 1860 goto cantfind_ext4; 1861 1862 /* Set defaults before we parse the mount options */ 1863 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 1864 if (def_mount_opts & EXT4_DEFM_DEBUG) 1865 set_opt(sbi->s_mount_opt, DEBUG); 1866 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) 1867 set_opt(sbi->s_mount_opt, GRPID); 1868 if (def_mount_opts & EXT4_DEFM_UID16) 1869 set_opt(sbi->s_mount_opt, NO_UID32); 1870 #ifdef CONFIG_EXT4DEV_FS_XATTR 1871 if (def_mount_opts & EXT4_DEFM_XATTR_USER) 1872 set_opt(sbi->s_mount_opt, XATTR_USER); 1873 #endif 1874 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 1875 if (def_mount_opts & EXT4_DEFM_ACL) 1876 set_opt(sbi->s_mount_opt, POSIX_ACL); 1877 #endif 1878 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) 1879 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA; 1880 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) 1881 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA; 1882 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) 1883 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA; 1884 1885 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) 1886 set_opt(sbi->s_mount_opt, ERRORS_PANIC); 1887 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE) 1888 set_opt(sbi->s_mount_opt, ERRORS_CONT); 1889 else 1890 set_opt(sbi->s_mount_opt, ERRORS_RO); 1891 1892 sbi->s_resuid = le16_to_cpu(es->s_def_resuid); 1893 sbi->s_resgid = le16_to_cpu(es->s_def_resgid); 1894 1895 set_opt(sbi->s_mount_opt, RESERVATION); 1896 1897 /* 1898 * turn on extents feature by default in ext4 filesystem 1899 * User -o noextents to turn it off 1900 */ 1901 set_opt(sbi->s_mount_opt, EXTENTS); 1902 /* 1903 * turn on mballoc feature by default in ext4 filesystem 1904 * User -o nomballoc to turn it off 1905 */ 1906 set_opt(sbi->s_mount_opt, MBALLOC); 1907 1908 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum, 1909 NULL, 0)) 1910 goto failed_mount; 1911 1912 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 1913 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 1914 1915 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && 1916 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || 1917 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 1918 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) 1919 printk(KERN_WARNING 1920 "EXT4-fs warning: feature flags set on rev 0 fs, " 1921 "running e2fsck is recommended\n"); 1922 1923 /* 1924 * Since ext4 is still considered development code, we require 1925 * that the TEST_FILESYS flag in s->flags be set. 1926 */ 1927 if (!(le32_to_cpu(es->s_flags) & EXT2_FLAGS_TEST_FILESYS)) { 1928 printk(KERN_WARNING "EXT4-fs: %s: not marked " 1929 "OK to use with test code.\n", sb->s_id); 1930 goto failed_mount; 1931 } 1932 1933 /* 1934 * Check feature flags regardless of the revision level, since we 1935 * previously didn't change the revision level when setting the flags, 1936 * so there is a chance incompat flags are set on a rev 0 filesystem. 1937 */ 1938 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP); 1939 if (features) { 1940 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of " 1941 "unsupported optional features (%x).\n", 1942 sb->s_id, le32_to_cpu(features)); 1943 goto failed_mount; 1944 } 1945 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP); 1946 if (!(sb->s_flags & MS_RDONLY) && features) { 1947 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of " 1948 "unsupported optional features (%x).\n", 1949 sb->s_id, le32_to_cpu(features)); 1950 goto failed_mount; 1951 } 1952 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) { 1953 /* 1954 * Large file size enabled file system can only be 1955 * mount if kernel is build with CONFIG_LSF 1956 */ 1957 if (sizeof(root->i_blocks) < sizeof(u64) && 1958 !(sb->s_flags & MS_RDONLY)) { 1959 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge " 1960 "files cannot be mounted read-write " 1961 "without CONFIG_LSF.\n", sb->s_id); 1962 goto failed_mount; 1963 } 1964 } 1965 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); 1966 1967 if (blocksize < EXT4_MIN_BLOCK_SIZE || 1968 blocksize > EXT4_MAX_BLOCK_SIZE) { 1969 printk(KERN_ERR 1970 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n", 1971 blocksize, sb->s_id); 1972 goto failed_mount; 1973 } 1974 1975 if (sb->s_blocksize != blocksize) { 1976 1977 /* Validate the filesystem blocksize */ 1978 if (!sb_set_blocksize(sb, blocksize)) { 1979 printk(KERN_ERR "EXT4-fs: bad block size %d.\n", 1980 blocksize); 1981 goto failed_mount; 1982 } 1983 1984 brelse (bh); 1985 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 1986 offset = do_div(logical_sb_block, blocksize); 1987 bh = sb_bread(sb, logical_sb_block); 1988 if (!bh) { 1989 printk(KERN_ERR 1990 "EXT4-fs: Can't read superblock on 2nd try.\n"); 1991 goto failed_mount; 1992 } 1993 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); 1994 sbi->s_es = es; 1995 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { 1996 printk (KERN_ERR 1997 "EXT4-fs: Magic mismatch, very weird !\n"); 1998 goto failed_mount; 1999 } 2000 } 2001 2002 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits); 2003 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits); 2004 2005 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { 2006 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; 2007 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; 2008 } else { 2009 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 2010 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 2011 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || 2012 (!is_power_of_2(sbi->s_inode_size)) || 2013 (sbi->s_inode_size > blocksize)) { 2014 printk (KERN_ERR 2015 "EXT4-fs: unsupported inode size: %d\n", 2016 sbi->s_inode_size); 2017 goto failed_mount; 2018 } 2019 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) 2020 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); 2021 } 2022 sbi->s_desc_size = le16_to_cpu(es->s_desc_size); 2023 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { 2024 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || 2025 sbi->s_desc_size > EXT4_MAX_DESC_SIZE || 2026 !is_power_of_2(sbi->s_desc_size)) { 2027 printk(KERN_ERR 2028 "EXT4-fs: unsupported descriptor size %lu\n", 2029 sbi->s_desc_size); 2030 goto failed_mount; 2031 } 2032 } else 2033 sbi->s_desc_size = EXT4_MIN_DESC_SIZE; 2034 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 2035 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 2036 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0) 2037 goto cantfind_ext4; 2038 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); 2039 if (sbi->s_inodes_per_block == 0) 2040 goto cantfind_ext4; 2041 sbi->s_itb_per_group = sbi->s_inodes_per_group / 2042 sbi->s_inodes_per_block; 2043 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); 2044 sbi->s_sbh = bh; 2045 sbi->s_mount_state = le16_to_cpu(es->s_state); 2046 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); 2047 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); 2048 for (i=0; i < 4; i++) 2049 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); 2050 sbi->s_def_hash_version = es->s_def_hash_version; 2051 2052 if (sbi->s_blocks_per_group > blocksize * 8) { 2053 printk (KERN_ERR 2054 "EXT4-fs: #blocks per group too big: %lu\n", 2055 sbi->s_blocks_per_group); 2056 goto failed_mount; 2057 } 2058 if (sbi->s_inodes_per_group > blocksize * 8) { 2059 printk (KERN_ERR 2060 "EXT4-fs: #inodes per group too big: %lu\n", 2061 sbi->s_inodes_per_group); 2062 goto failed_mount; 2063 } 2064 2065 if (ext4_blocks_count(es) > 2066 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { 2067 printk(KERN_ERR "EXT4-fs: filesystem on %s:" 2068 " too large to mount safely\n", sb->s_id); 2069 if (sizeof(sector_t) < 8) 2070 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not " 2071 "enabled\n"); 2072 goto failed_mount; 2073 } 2074 2075 if (EXT4_BLOCKS_PER_GROUP(sb) == 0) 2076 goto cantfind_ext4; 2077 2078 /* ensure blocks_count calculation below doesn't sign-extend */ 2079 if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) < 2080 le32_to_cpu(es->s_first_data_block) + 1) { 2081 printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, " 2082 "first data block %u, blocks per group %lu\n", 2083 ext4_blocks_count(es), 2084 le32_to_cpu(es->s_first_data_block), 2085 EXT4_BLOCKS_PER_GROUP(sb)); 2086 goto failed_mount; 2087 } 2088 blocks_count = (ext4_blocks_count(es) - 2089 le32_to_cpu(es->s_first_data_block) + 2090 EXT4_BLOCKS_PER_GROUP(sb) - 1); 2091 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); 2092 sbi->s_groups_count = blocks_count; 2093 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / 2094 EXT4_DESC_PER_BLOCK(sb); 2095 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *), 2096 GFP_KERNEL); 2097 if (sbi->s_group_desc == NULL) { 2098 printk (KERN_ERR "EXT4-fs: not enough memory\n"); 2099 goto failed_mount; 2100 } 2101 2102 bgl_lock_init(&sbi->s_blockgroup_lock); 2103 2104 for (i = 0; i < db_count; i++) { 2105 block = descriptor_loc(sb, logical_sb_block, i); 2106 sbi->s_group_desc[i] = sb_bread(sb, block); 2107 if (!sbi->s_group_desc[i]) { 2108 printk (KERN_ERR "EXT4-fs: " 2109 "can't read group descriptor %d\n", i); 2110 db_count = i; 2111 goto failed_mount2; 2112 } 2113 } 2114 if (!ext4_check_descriptors (sb)) { 2115 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n"); 2116 goto failed_mount2; 2117 } 2118 sbi->s_gdb_count = db_count; 2119 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 2120 spin_lock_init(&sbi->s_next_gen_lock); 2121 2122 err = percpu_counter_init(&sbi->s_freeblocks_counter, 2123 ext4_count_free_blocks(sb)); 2124 if (!err) { 2125 err = percpu_counter_init(&sbi->s_freeinodes_counter, 2126 ext4_count_free_inodes(sb)); 2127 } 2128 if (!err) { 2129 err = percpu_counter_init(&sbi->s_dirs_counter, 2130 ext4_count_dirs(sb)); 2131 } 2132 if (err) { 2133 printk(KERN_ERR "EXT4-fs: insufficient memory\n"); 2134 goto failed_mount3; 2135 } 2136 2137 /* per fileystem reservation list head & lock */ 2138 spin_lock_init(&sbi->s_rsv_window_lock); 2139 sbi->s_rsv_window_root = RB_ROOT; 2140 /* Add a single, static dummy reservation to the start of the 2141 * reservation window list --- it gives us a placeholder for 2142 * append-at-start-of-list which makes the allocation logic 2143 * _much_ simpler. */ 2144 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; 2145 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; 2146 sbi->s_rsv_window_head.rsv_alloc_hit = 0; 2147 sbi->s_rsv_window_head.rsv_goal_size = 0; 2148 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head); 2149 2150 sbi->s_stripe = ext4_get_stripe_size(sbi); 2151 2152 /* 2153 * set up enough so that it can read an inode 2154 */ 2155 sb->s_op = &ext4_sops; 2156 sb->s_export_op = &ext4_export_ops; 2157 sb->s_xattr = ext4_xattr_handlers; 2158 #ifdef CONFIG_QUOTA 2159 sb->s_qcop = &ext4_qctl_operations; 2160 sb->dq_op = &ext4_quota_operations; 2161 #endif 2162 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ 2163 2164 sb->s_root = NULL; 2165 2166 needs_recovery = (es->s_last_orphan != 0 || 2167 EXT4_HAS_INCOMPAT_FEATURE(sb, 2168 EXT4_FEATURE_INCOMPAT_RECOVER)); 2169 2170 /* 2171 * The first inode we look at is the journal inode. Don't try 2172 * root first: it may be modified in the journal! 2173 */ 2174 if (!test_opt(sb, NOLOAD) && 2175 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 2176 if (ext4_load_journal(sb, es, journal_devnum)) 2177 goto failed_mount3; 2178 } else if (journal_inum) { 2179 if (ext4_create_journal(sb, es, journal_inum)) 2180 goto failed_mount3; 2181 } else { 2182 if (!silent) 2183 printk (KERN_ERR 2184 "ext4: No journal on filesystem on %s\n", 2185 sb->s_id); 2186 goto failed_mount3; 2187 } 2188 2189 if (ext4_blocks_count(es) > 0xffffffffULL && 2190 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, 2191 JBD2_FEATURE_INCOMPAT_64BIT)) { 2192 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n"); 2193 goto failed_mount4; 2194 } 2195 2196 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 2197 jbd2_journal_set_features(sbi->s_journal, 2198 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 2199 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2200 } else if (test_opt(sb, JOURNAL_CHECKSUM)) { 2201 jbd2_journal_set_features(sbi->s_journal, 2202 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0); 2203 jbd2_journal_clear_features(sbi->s_journal, 0, 0, 2204 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2205 } else { 2206 jbd2_journal_clear_features(sbi->s_journal, 2207 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 2208 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2209 } 2210 2211 /* We have now updated the journal if required, so we can 2212 * validate the data journaling mode. */ 2213 switch (test_opt(sb, DATA_FLAGS)) { 2214 case 0: 2215 /* No mode set, assume a default based on the journal 2216 * capabilities: ORDERED_DATA if the journal can 2217 * cope, else JOURNAL_DATA 2218 */ 2219 if (jbd2_journal_check_available_features 2220 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) 2221 set_opt(sbi->s_mount_opt, ORDERED_DATA); 2222 else 2223 set_opt(sbi->s_mount_opt, JOURNAL_DATA); 2224 break; 2225 2226 case EXT4_MOUNT_ORDERED_DATA: 2227 case EXT4_MOUNT_WRITEBACK_DATA: 2228 if (!jbd2_journal_check_available_features 2229 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { 2230 printk(KERN_ERR "EXT4-fs: Journal does not support " 2231 "requested data journaling mode\n"); 2232 goto failed_mount4; 2233 } 2234 default: 2235 break; 2236 } 2237 2238 if (test_opt(sb, NOBH)) { 2239 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) { 2240 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - " 2241 "its supported only with writeback mode\n"); 2242 clear_opt(sbi->s_mount_opt, NOBH); 2243 } 2244 } 2245 /* 2246 * The jbd2_journal_load will have done any necessary log recovery, 2247 * so we can safely mount the rest of the filesystem now. 2248 */ 2249 2250 root = ext4_iget(sb, EXT4_ROOT_INO); 2251 if (IS_ERR(root)) { 2252 printk(KERN_ERR "EXT4-fs: get root inode failed\n"); 2253 ret = PTR_ERR(root); 2254 goto failed_mount4; 2255 } 2256 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 2257 iput(root); 2258 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n"); 2259 goto failed_mount4; 2260 } 2261 sb->s_root = d_alloc_root(root); 2262 if (!sb->s_root) { 2263 printk(KERN_ERR "EXT4-fs: get root dentry failed\n"); 2264 iput(root); 2265 ret = -ENOMEM; 2266 goto failed_mount4; 2267 } 2268 2269 ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY); 2270 2271 /* determine the minimum size of new large inodes, if present */ 2272 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { 2273 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 2274 EXT4_GOOD_OLD_INODE_SIZE; 2275 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 2276 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { 2277 if (sbi->s_want_extra_isize < 2278 le16_to_cpu(es->s_want_extra_isize)) 2279 sbi->s_want_extra_isize = 2280 le16_to_cpu(es->s_want_extra_isize); 2281 if (sbi->s_want_extra_isize < 2282 le16_to_cpu(es->s_min_extra_isize)) 2283 sbi->s_want_extra_isize = 2284 le16_to_cpu(es->s_min_extra_isize); 2285 } 2286 } 2287 /* Check if enough inode space is available */ 2288 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > 2289 sbi->s_inode_size) { 2290 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 2291 EXT4_GOOD_OLD_INODE_SIZE; 2292 printk(KERN_INFO "EXT4-fs: required extra inode space not" 2293 "available.\n"); 2294 } 2295 2296 /* 2297 * akpm: core read_super() calls in here with the superblock locked. 2298 * That deadlocks, because orphan cleanup needs to lock the superblock 2299 * in numerous places. Here we just pop the lock - it's relatively 2300 * harmless, because we are now ready to accept write_super() requests, 2301 * and aviro says that's the only reason for hanging onto the 2302 * superblock lock. 2303 */ 2304 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; 2305 ext4_orphan_cleanup(sb, es); 2306 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; 2307 if (needs_recovery) 2308 printk (KERN_INFO "EXT4-fs: recovery complete.\n"); 2309 ext4_mark_recovery_complete(sb, es); 2310 printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n", 2311 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal": 2312 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered": 2313 "writeback"); 2314 2315 ext4_ext_init(sb); 2316 ext4_mb_init(sb, needs_recovery); 2317 2318 lock_kernel(); 2319 return 0; 2320 2321 cantfind_ext4: 2322 if (!silent) 2323 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n", 2324 sb->s_id); 2325 goto failed_mount; 2326 2327 failed_mount4: 2328 jbd2_journal_destroy(sbi->s_journal); 2329 failed_mount3: 2330 percpu_counter_destroy(&sbi->s_freeblocks_counter); 2331 percpu_counter_destroy(&sbi->s_freeinodes_counter); 2332 percpu_counter_destroy(&sbi->s_dirs_counter); 2333 failed_mount2: 2334 for (i = 0; i < db_count; i++) 2335 brelse(sbi->s_group_desc[i]); 2336 kfree(sbi->s_group_desc); 2337 failed_mount: 2338 #ifdef CONFIG_QUOTA 2339 for (i = 0; i < MAXQUOTAS; i++) 2340 kfree(sbi->s_qf_names[i]); 2341 #endif 2342 ext4_blkdev_remove(sbi); 2343 brelse(bh); 2344 out_fail: 2345 sb->s_fs_info = NULL; 2346 kfree(sbi); 2347 lock_kernel(); 2348 return ret; 2349 } 2350 2351 /* 2352 * Setup any per-fs journal parameters now. We'll do this both on 2353 * initial mount, once the journal has been initialised but before we've 2354 * done any recovery; and again on any subsequent remount. 2355 */ 2356 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) 2357 { 2358 struct ext4_sb_info *sbi = EXT4_SB(sb); 2359 2360 if (sbi->s_commit_interval) 2361 journal->j_commit_interval = sbi->s_commit_interval; 2362 /* We could also set up an ext4-specific default for the commit 2363 * interval here, but for now we'll just fall back to the jbd 2364 * default. */ 2365 2366 spin_lock(&journal->j_state_lock); 2367 if (test_opt(sb, BARRIER)) 2368 journal->j_flags |= JBD2_BARRIER; 2369 else 2370 journal->j_flags &= ~JBD2_BARRIER; 2371 spin_unlock(&journal->j_state_lock); 2372 } 2373 2374 static journal_t *ext4_get_journal(struct super_block *sb, 2375 unsigned int journal_inum) 2376 { 2377 struct inode *journal_inode; 2378 journal_t *journal; 2379 2380 /* First, test for the existence of a valid inode on disk. Bad 2381 * things happen if we iget() an unused inode, as the subsequent 2382 * iput() will try to delete it. */ 2383 2384 journal_inode = ext4_iget(sb, journal_inum); 2385 if (IS_ERR(journal_inode)) { 2386 printk(KERN_ERR "EXT4-fs: no journal found.\n"); 2387 return NULL; 2388 } 2389 if (!journal_inode->i_nlink) { 2390 make_bad_inode(journal_inode); 2391 iput(journal_inode); 2392 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n"); 2393 return NULL; 2394 } 2395 2396 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n", 2397 journal_inode, journal_inode->i_size); 2398 if (!S_ISREG(journal_inode->i_mode)) { 2399 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n"); 2400 iput(journal_inode); 2401 return NULL; 2402 } 2403 2404 journal = jbd2_journal_init_inode(journal_inode); 2405 if (!journal) { 2406 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n"); 2407 iput(journal_inode); 2408 return NULL; 2409 } 2410 journal->j_private = sb; 2411 ext4_init_journal_params(sb, journal); 2412 return journal; 2413 } 2414 2415 static journal_t *ext4_get_dev_journal(struct super_block *sb, 2416 dev_t j_dev) 2417 { 2418 struct buffer_head * bh; 2419 journal_t *journal; 2420 ext4_fsblk_t start; 2421 ext4_fsblk_t len; 2422 int hblock, blocksize; 2423 ext4_fsblk_t sb_block; 2424 unsigned long offset; 2425 struct ext4_super_block * es; 2426 struct block_device *bdev; 2427 2428 bdev = ext4_blkdev_get(j_dev); 2429 if (bdev == NULL) 2430 return NULL; 2431 2432 if (bd_claim(bdev, sb)) { 2433 printk(KERN_ERR 2434 "EXT4: failed to claim external journal device.\n"); 2435 blkdev_put(bdev); 2436 return NULL; 2437 } 2438 2439 blocksize = sb->s_blocksize; 2440 hblock = bdev_hardsect_size(bdev); 2441 if (blocksize < hblock) { 2442 printk(KERN_ERR 2443 "EXT4-fs: blocksize too small for journal device.\n"); 2444 goto out_bdev; 2445 } 2446 2447 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; 2448 offset = EXT4_MIN_BLOCK_SIZE % blocksize; 2449 set_blocksize(bdev, blocksize); 2450 if (!(bh = __bread(bdev, sb_block, blocksize))) { 2451 printk(KERN_ERR "EXT4-fs: couldn't read superblock of " 2452 "external journal\n"); 2453 goto out_bdev; 2454 } 2455 2456 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 2457 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || 2458 !(le32_to_cpu(es->s_feature_incompat) & 2459 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { 2460 printk(KERN_ERR "EXT4-fs: external journal has " 2461 "bad superblock\n"); 2462 brelse(bh); 2463 goto out_bdev; 2464 } 2465 2466 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { 2467 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n"); 2468 brelse(bh); 2469 goto out_bdev; 2470 } 2471 2472 len = ext4_blocks_count(es); 2473 start = sb_block + 1; 2474 brelse(bh); /* we're done with the superblock */ 2475 2476 journal = jbd2_journal_init_dev(bdev, sb->s_bdev, 2477 start, len, blocksize); 2478 if (!journal) { 2479 printk(KERN_ERR "EXT4-fs: failed to create device journal\n"); 2480 goto out_bdev; 2481 } 2482 journal->j_private = sb; 2483 ll_rw_block(READ, 1, &journal->j_sb_buffer); 2484 wait_on_buffer(journal->j_sb_buffer); 2485 if (!buffer_uptodate(journal->j_sb_buffer)) { 2486 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n"); 2487 goto out_journal; 2488 } 2489 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { 2490 printk(KERN_ERR "EXT4-fs: External journal has more than one " 2491 "user (unsupported) - %d\n", 2492 be32_to_cpu(journal->j_superblock->s_nr_users)); 2493 goto out_journal; 2494 } 2495 EXT4_SB(sb)->journal_bdev = bdev; 2496 ext4_init_journal_params(sb, journal); 2497 return journal; 2498 out_journal: 2499 jbd2_journal_destroy(journal); 2500 out_bdev: 2501 ext4_blkdev_put(bdev); 2502 return NULL; 2503 } 2504 2505 static int ext4_load_journal(struct super_block *sb, 2506 struct ext4_super_block *es, 2507 unsigned long journal_devnum) 2508 { 2509 journal_t *journal; 2510 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); 2511 dev_t journal_dev; 2512 int err = 0; 2513 int really_read_only; 2514 2515 if (journal_devnum && 2516 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 2517 printk(KERN_INFO "EXT4-fs: external journal device major/minor " 2518 "numbers have changed\n"); 2519 journal_dev = new_decode_dev(journal_devnum); 2520 } else 2521 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); 2522 2523 really_read_only = bdev_read_only(sb->s_bdev); 2524 2525 /* 2526 * Are we loading a blank journal or performing recovery after a 2527 * crash? For recovery, we need to check in advance whether we 2528 * can get read-write access to the device. 2529 */ 2530 2531 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 2532 if (sb->s_flags & MS_RDONLY) { 2533 printk(KERN_INFO "EXT4-fs: INFO: recovery " 2534 "required on readonly filesystem.\n"); 2535 if (really_read_only) { 2536 printk(KERN_ERR "EXT4-fs: write access " 2537 "unavailable, cannot proceed.\n"); 2538 return -EROFS; 2539 } 2540 printk (KERN_INFO "EXT4-fs: write access will " 2541 "be enabled during recovery.\n"); 2542 } 2543 } 2544 2545 if (journal_inum && journal_dev) { 2546 printk(KERN_ERR "EXT4-fs: filesystem has both journal " 2547 "and inode journals!\n"); 2548 return -EINVAL; 2549 } 2550 2551 if (journal_inum) { 2552 if (!(journal = ext4_get_journal(sb, journal_inum))) 2553 return -EINVAL; 2554 } else { 2555 if (!(journal = ext4_get_dev_journal(sb, journal_dev))) 2556 return -EINVAL; 2557 } 2558 2559 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { 2560 err = jbd2_journal_update_format(journal); 2561 if (err) { 2562 printk(KERN_ERR "EXT4-fs: error updating journal.\n"); 2563 jbd2_journal_destroy(journal); 2564 return err; 2565 } 2566 } 2567 2568 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) 2569 err = jbd2_journal_wipe(journal, !really_read_only); 2570 if (!err) 2571 err = jbd2_journal_load(journal); 2572 2573 if (err) { 2574 printk(KERN_ERR "EXT4-fs: error loading journal.\n"); 2575 jbd2_journal_destroy(journal); 2576 return err; 2577 } 2578 2579 EXT4_SB(sb)->s_journal = journal; 2580 ext4_clear_journal_err(sb, es); 2581 2582 if (journal_devnum && 2583 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 2584 es->s_journal_dev = cpu_to_le32(journal_devnum); 2585 sb->s_dirt = 1; 2586 2587 /* Make sure we flush the recovery flag to disk. */ 2588 ext4_commit_super(sb, es, 1); 2589 } 2590 2591 return 0; 2592 } 2593 2594 static int ext4_create_journal(struct super_block * sb, 2595 struct ext4_super_block * es, 2596 unsigned int journal_inum) 2597 { 2598 journal_t *journal; 2599 int err; 2600 2601 if (sb->s_flags & MS_RDONLY) { 2602 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to " 2603 "create journal.\n"); 2604 return -EROFS; 2605 } 2606 2607 journal = ext4_get_journal(sb, journal_inum); 2608 if (!journal) 2609 return -EINVAL; 2610 2611 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n", 2612 journal_inum); 2613 2614 err = jbd2_journal_create(journal); 2615 if (err) { 2616 printk(KERN_ERR "EXT4-fs: error creating journal.\n"); 2617 jbd2_journal_destroy(journal); 2618 return -EIO; 2619 } 2620 2621 EXT4_SB(sb)->s_journal = journal; 2622 2623 ext4_update_dynamic_rev(sb); 2624 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2625 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL); 2626 2627 es->s_journal_inum = cpu_to_le32(journal_inum); 2628 sb->s_dirt = 1; 2629 2630 /* Make sure we flush the recovery flag to disk. */ 2631 ext4_commit_super(sb, es, 1); 2632 2633 return 0; 2634 } 2635 2636 static void ext4_commit_super (struct super_block * sb, 2637 struct ext4_super_block * es, 2638 int sync) 2639 { 2640 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; 2641 2642 if (!sbh) 2643 return; 2644 es->s_wtime = cpu_to_le32(get_seconds()); 2645 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb)); 2646 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb)); 2647 BUFFER_TRACE(sbh, "marking dirty"); 2648 mark_buffer_dirty(sbh); 2649 if (sync) 2650 sync_dirty_buffer(sbh); 2651 } 2652 2653 2654 /* 2655 * Have we just finished recovery? If so, and if we are mounting (or 2656 * remounting) the filesystem readonly, then we will end up with a 2657 * consistent fs on disk. Record that fact. 2658 */ 2659 static void ext4_mark_recovery_complete(struct super_block * sb, 2660 struct ext4_super_block * es) 2661 { 2662 journal_t *journal = EXT4_SB(sb)->s_journal; 2663 2664 jbd2_journal_lock_updates(journal); 2665 jbd2_journal_flush(journal); 2666 lock_super(sb); 2667 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && 2668 sb->s_flags & MS_RDONLY) { 2669 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2670 sb->s_dirt = 0; 2671 ext4_commit_super(sb, es, 1); 2672 } 2673 unlock_super(sb); 2674 jbd2_journal_unlock_updates(journal); 2675 } 2676 2677 /* 2678 * If we are mounting (or read-write remounting) a filesystem whose journal 2679 * has recorded an error from a previous lifetime, move that error to the 2680 * main filesystem now. 2681 */ 2682 static void ext4_clear_journal_err(struct super_block * sb, 2683 struct ext4_super_block * es) 2684 { 2685 journal_t *journal; 2686 int j_errno; 2687 const char *errstr; 2688 2689 journal = EXT4_SB(sb)->s_journal; 2690 2691 /* 2692 * Now check for any error status which may have been recorded in the 2693 * journal by a prior ext4_error() or ext4_abort() 2694 */ 2695 2696 j_errno = jbd2_journal_errno(journal); 2697 if (j_errno) { 2698 char nbuf[16]; 2699 2700 errstr = ext4_decode_error(sb, j_errno, nbuf); 2701 ext4_warning(sb, __FUNCTION__, "Filesystem error recorded " 2702 "from previous mount: %s", errstr); 2703 ext4_warning(sb, __FUNCTION__, "Marking fs in need of " 2704 "filesystem check."); 2705 2706 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 2707 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 2708 ext4_commit_super (sb, es, 1); 2709 2710 jbd2_journal_clear_err(journal); 2711 } 2712 } 2713 2714 /* 2715 * Force the running and committing transactions to commit, 2716 * and wait on the commit. 2717 */ 2718 int ext4_force_commit(struct super_block *sb) 2719 { 2720 journal_t *journal; 2721 int ret; 2722 2723 if (sb->s_flags & MS_RDONLY) 2724 return 0; 2725 2726 journal = EXT4_SB(sb)->s_journal; 2727 sb->s_dirt = 0; 2728 ret = ext4_journal_force_commit(journal); 2729 return ret; 2730 } 2731 2732 /* 2733 * Ext4 always journals updates to the superblock itself, so we don't 2734 * have to propagate any other updates to the superblock on disk at this 2735 * point. Just start an async writeback to get the buffers on their way 2736 * to the disk. 2737 * 2738 * This implicitly triggers the writebehind on sync(). 2739 */ 2740 2741 static void ext4_write_super (struct super_block * sb) 2742 { 2743 if (mutex_trylock(&sb->s_lock) != 0) 2744 BUG(); 2745 sb->s_dirt = 0; 2746 } 2747 2748 static int ext4_sync_fs(struct super_block *sb, int wait) 2749 { 2750 tid_t target; 2751 2752 sb->s_dirt = 0; 2753 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) { 2754 if (wait) 2755 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target); 2756 } 2757 return 0; 2758 } 2759 2760 /* 2761 * LVM calls this function before a (read-only) snapshot is created. This 2762 * gives us a chance to flush the journal completely and mark the fs clean. 2763 */ 2764 static void ext4_write_super_lockfs(struct super_block *sb) 2765 { 2766 sb->s_dirt = 0; 2767 2768 if (!(sb->s_flags & MS_RDONLY)) { 2769 journal_t *journal = EXT4_SB(sb)->s_journal; 2770 2771 /* Now we set up the journal barrier. */ 2772 jbd2_journal_lock_updates(journal); 2773 jbd2_journal_flush(journal); 2774 2775 /* Journal blocked and flushed, clear needs_recovery flag. */ 2776 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2777 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); 2778 } 2779 } 2780 2781 /* 2782 * Called by LVM after the snapshot is done. We need to reset the RECOVER 2783 * flag here, even though the filesystem is not technically dirty yet. 2784 */ 2785 static void ext4_unlockfs(struct super_block *sb) 2786 { 2787 if (!(sb->s_flags & MS_RDONLY)) { 2788 lock_super(sb); 2789 /* Reser the needs_recovery flag before the fs is unlocked. */ 2790 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2791 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); 2792 unlock_super(sb); 2793 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 2794 } 2795 } 2796 2797 static int ext4_remount (struct super_block * sb, int * flags, char * data) 2798 { 2799 struct ext4_super_block * es; 2800 struct ext4_sb_info *sbi = EXT4_SB(sb); 2801 ext4_fsblk_t n_blocks_count = 0; 2802 unsigned long old_sb_flags; 2803 struct ext4_mount_options old_opts; 2804 int err; 2805 #ifdef CONFIG_QUOTA 2806 int i; 2807 #endif 2808 2809 /* Store the original options */ 2810 old_sb_flags = sb->s_flags; 2811 old_opts.s_mount_opt = sbi->s_mount_opt; 2812 old_opts.s_resuid = sbi->s_resuid; 2813 old_opts.s_resgid = sbi->s_resgid; 2814 old_opts.s_commit_interval = sbi->s_commit_interval; 2815 #ifdef CONFIG_QUOTA 2816 old_opts.s_jquota_fmt = sbi->s_jquota_fmt; 2817 for (i = 0; i < MAXQUOTAS; i++) 2818 old_opts.s_qf_names[i] = sbi->s_qf_names[i]; 2819 #endif 2820 2821 /* 2822 * Allow the "check" option to be passed as a remount option. 2823 */ 2824 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) { 2825 err = -EINVAL; 2826 goto restore_opts; 2827 } 2828 2829 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) 2830 ext4_abort(sb, __FUNCTION__, "Abort forced by user"); 2831 2832 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 2833 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 2834 2835 es = sbi->s_es; 2836 2837 ext4_init_journal_params(sb, sbi->s_journal); 2838 2839 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || 2840 n_blocks_count > ext4_blocks_count(es)) { 2841 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) { 2842 err = -EROFS; 2843 goto restore_opts; 2844 } 2845 2846 if (*flags & MS_RDONLY) { 2847 /* 2848 * First of all, the unconditional stuff we have to do 2849 * to disable replay of the journal when we next remount 2850 */ 2851 sb->s_flags |= MS_RDONLY; 2852 2853 /* 2854 * OK, test if we are remounting a valid rw partition 2855 * readonly, and if so set the rdonly flag and then 2856 * mark the partition as valid again. 2857 */ 2858 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && 2859 (sbi->s_mount_state & EXT4_VALID_FS)) 2860 es->s_state = cpu_to_le16(sbi->s_mount_state); 2861 2862 /* 2863 * We have to unlock super so that we can wait for 2864 * transactions. 2865 */ 2866 unlock_super(sb); 2867 ext4_mark_recovery_complete(sb, es); 2868 lock_super(sb); 2869 } else { 2870 __le32 ret; 2871 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb, 2872 ~EXT4_FEATURE_RO_COMPAT_SUPP))) { 2873 printk(KERN_WARNING "EXT4-fs: %s: couldn't " 2874 "remount RDWR because of unsupported " 2875 "optional features (%x).\n", 2876 sb->s_id, le32_to_cpu(ret)); 2877 err = -EROFS; 2878 goto restore_opts; 2879 } 2880 2881 /* 2882 * If we have an unprocessed orphan list hanging 2883 * around from a previously readonly bdev mount, 2884 * require a full umount/remount for now. 2885 */ 2886 if (es->s_last_orphan) { 2887 printk(KERN_WARNING "EXT4-fs: %s: couldn't " 2888 "remount RDWR because of unprocessed " 2889 "orphan inode list. Please " 2890 "umount/remount instead.\n", 2891 sb->s_id); 2892 err = -EINVAL; 2893 goto restore_opts; 2894 } 2895 2896 /* 2897 * Mounting a RDONLY partition read-write, so reread 2898 * and store the current valid flag. (It may have 2899 * been changed by e2fsck since we originally mounted 2900 * the partition.) 2901 */ 2902 ext4_clear_journal_err(sb, es); 2903 sbi->s_mount_state = le16_to_cpu(es->s_state); 2904 if ((err = ext4_group_extend(sb, es, n_blocks_count))) 2905 goto restore_opts; 2906 if (!ext4_setup_super (sb, es, 0)) 2907 sb->s_flags &= ~MS_RDONLY; 2908 } 2909 } 2910 #ifdef CONFIG_QUOTA 2911 /* Release old quota file names */ 2912 for (i = 0; i < MAXQUOTAS; i++) 2913 if (old_opts.s_qf_names[i] && 2914 old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 2915 kfree(old_opts.s_qf_names[i]); 2916 #endif 2917 return 0; 2918 restore_opts: 2919 sb->s_flags = old_sb_flags; 2920 sbi->s_mount_opt = old_opts.s_mount_opt; 2921 sbi->s_resuid = old_opts.s_resuid; 2922 sbi->s_resgid = old_opts.s_resgid; 2923 sbi->s_commit_interval = old_opts.s_commit_interval; 2924 #ifdef CONFIG_QUOTA 2925 sbi->s_jquota_fmt = old_opts.s_jquota_fmt; 2926 for (i = 0; i < MAXQUOTAS; i++) { 2927 if (sbi->s_qf_names[i] && 2928 old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 2929 kfree(sbi->s_qf_names[i]); 2930 sbi->s_qf_names[i] = old_opts.s_qf_names[i]; 2931 } 2932 #endif 2933 return err; 2934 } 2935 2936 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf) 2937 { 2938 struct super_block *sb = dentry->d_sb; 2939 struct ext4_sb_info *sbi = EXT4_SB(sb); 2940 struct ext4_super_block *es = sbi->s_es; 2941 u64 fsid; 2942 2943 if (test_opt(sb, MINIX_DF)) { 2944 sbi->s_overhead_last = 0; 2945 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) { 2946 ext4_group_t ngroups = sbi->s_groups_count, i; 2947 ext4_fsblk_t overhead = 0; 2948 smp_rmb(); 2949 2950 /* 2951 * Compute the overhead (FS structures). This is constant 2952 * for a given filesystem unless the number of block groups 2953 * changes so we cache the previous value until it does. 2954 */ 2955 2956 /* 2957 * All of the blocks before first_data_block are 2958 * overhead 2959 */ 2960 overhead = le32_to_cpu(es->s_first_data_block); 2961 2962 /* 2963 * Add the overhead attributed to the superblock and 2964 * block group descriptors. If the sparse superblocks 2965 * feature is turned on, then not all groups have this. 2966 */ 2967 for (i = 0; i < ngroups; i++) { 2968 overhead += ext4_bg_has_super(sb, i) + 2969 ext4_bg_num_gdb(sb, i); 2970 cond_resched(); 2971 } 2972 2973 /* 2974 * Every block group has an inode bitmap, a block 2975 * bitmap, and an inode table. 2976 */ 2977 overhead += ngroups * (2 + sbi->s_itb_per_group); 2978 sbi->s_overhead_last = overhead; 2979 smp_wmb(); 2980 sbi->s_blocks_last = ext4_blocks_count(es); 2981 } 2982 2983 buf->f_type = EXT4_SUPER_MAGIC; 2984 buf->f_bsize = sb->s_blocksize; 2985 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last; 2986 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter); 2987 ext4_free_blocks_count_set(es, buf->f_bfree); 2988 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); 2989 if (buf->f_bfree < ext4_r_blocks_count(es)) 2990 buf->f_bavail = 0; 2991 buf->f_files = le32_to_cpu(es->s_inodes_count); 2992 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); 2993 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); 2994 buf->f_namelen = EXT4_NAME_LEN; 2995 fsid = le64_to_cpup((void *)es->s_uuid) ^ 2996 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 2997 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 2998 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 2999 return 0; 3000 } 3001 3002 /* Helper function for writing quotas on sync - we need to start transaction before quota file 3003 * is locked for write. Otherwise the are possible deadlocks: 3004 * Process 1 Process 2 3005 * ext4_create() quota_sync() 3006 * jbd2_journal_start() write_dquot() 3007 * DQUOT_INIT() down(dqio_mutex) 3008 * down(dqio_mutex) jbd2_journal_start() 3009 * 3010 */ 3011 3012 #ifdef CONFIG_QUOTA 3013 3014 static inline struct inode *dquot_to_inode(struct dquot *dquot) 3015 { 3016 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; 3017 } 3018 3019 static int ext4_dquot_initialize(struct inode *inode, int type) 3020 { 3021 handle_t *handle; 3022 int ret, err; 3023 3024 /* We may create quota structure so we need to reserve enough blocks */ 3025 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb)); 3026 if (IS_ERR(handle)) 3027 return PTR_ERR(handle); 3028 ret = dquot_initialize(inode, type); 3029 err = ext4_journal_stop(handle); 3030 if (!ret) 3031 ret = err; 3032 return ret; 3033 } 3034 3035 static int ext4_dquot_drop(struct inode *inode) 3036 { 3037 handle_t *handle; 3038 int ret, err; 3039 3040 /* We may delete quota structure so we need to reserve enough blocks */ 3041 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb)); 3042 if (IS_ERR(handle)) 3043 return PTR_ERR(handle); 3044 ret = dquot_drop(inode); 3045 err = ext4_journal_stop(handle); 3046 if (!ret) 3047 ret = err; 3048 return ret; 3049 } 3050 3051 static int ext4_write_dquot(struct dquot *dquot) 3052 { 3053 int ret, err; 3054 handle_t *handle; 3055 struct inode *inode; 3056 3057 inode = dquot_to_inode(dquot); 3058 handle = ext4_journal_start(inode, 3059 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 3060 if (IS_ERR(handle)) 3061 return PTR_ERR(handle); 3062 ret = dquot_commit(dquot); 3063 err = ext4_journal_stop(handle); 3064 if (!ret) 3065 ret = err; 3066 return ret; 3067 } 3068 3069 static int ext4_acquire_dquot(struct dquot *dquot) 3070 { 3071 int ret, err; 3072 handle_t *handle; 3073 3074 handle = ext4_journal_start(dquot_to_inode(dquot), 3075 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 3076 if (IS_ERR(handle)) 3077 return PTR_ERR(handle); 3078 ret = dquot_acquire(dquot); 3079 err = ext4_journal_stop(handle); 3080 if (!ret) 3081 ret = err; 3082 return ret; 3083 } 3084 3085 static int ext4_release_dquot(struct dquot *dquot) 3086 { 3087 int ret, err; 3088 handle_t *handle; 3089 3090 handle = ext4_journal_start(dquot_to_inode(dquot), 3091 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 3092 if (IS_ERR(handle)) { 3093 /* Release dquot anyway to avoid endless cycle in dqput() */ 3094 dquot_release(dquot); 3095 return PTR_ERR(handle); 3096 } 3097 ret = dquot_release(dquot); 3098 err = ext4_journal_stop(handle); 3099 if (!ret) 3100 ret = err; 3101 return ret; 3102 } 3103 3104 static int ext4_mark_dquot_dirty(struct dquot *dquot) 3105 { 3106 /* Are we journalling quotas? */ 3107 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || 3108 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { 3109 dquot_mark_dquot_dirty(dquot); 3110 return ext4_write_dquot(dquot); 3111 } else { 3112 return dquot_mark_dquot_dirty(dquot); 3113 } 3114 } 3115 3116 static int ext4_write_info(struct super_block *sb, int type) 3117 { 3118 int ret, err; 3119 handle_t *handle; 3120 3121 /* Data block + inode block */ 3122 handle = ext4_journal_start(sb->s_root->d_inode, 2); 3123 if (IS_ERR(handle)) 3124 return PTR_ERR(handle); 3125 ret = dquot_commit_info(sb, type); 3126 err = ext4_journal_stop(handle); 3127 if (!ret) 3128 ret = err; 3129 return ret; 3130 } 3131 3132 /* 3133 * Turn on quotas during mount time - we need to find 3134 * the quota file and such... 3135 */ 3136 static int ext4_quota_on_mount(struct super_block *sb, int type) 3137 { 3138 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], 3139 EXT4_SB(sb)->s_jquota_fmt, type); 3140 } 3141 3142 /* 3143 * Standard function to be called on quota_on 3144 */ 3145 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 3146 char *path) 3147 { 3148 int err; 3149 struct nameidata nd; 3150 3151 if (!test_opt(sb, QUOTA)) 3152 return -EINVAL; 3153 /* Not journalling quota? */ 3154 if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] && 3155 !EXT4_SB(sb)->s_qf_names[GRPQUOTA]) 3156 return vfs_quota_on(sb, type, format_id, path); 3157 err = path_lookup(path, LOOKUP_FOLLOW, &nd); 3158 if (err) 3159 return err; 3160 /* Quotafile not on the same filesystem? */ 3161 if (nd.path.mnt->mnt_sb != sb) { 3162 path_put(&nd.path); 3163 return -EXDEV; 3164 } 3165 /* Quotafile not of fs root? */ 3166 if (nd.path.dentry->d_parent->d_inode != sb->s_root->d_inode) 3167 printk(KERN_WARNING 3168 "EXT4-fs: Quota file not on filesystem root. " 3169 "Journalled quota will not work.\n"); 3170 path_put(&nd.path); 3171 return vfs_quota_on(sb, type, format_id, path); 3172 } 3173 3174 /* Read data from quotafile - avoid pagecache and such because we cannot afford 3175 * acquiring the locks... As quota files are never truncated and quota code 3176 * itself serializes the operations (and noone else should touch the files) 3177 * we don't have to be afraid of races */ 3178 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 3179 size_t len, loff_t off) 3180 { 3181 struct inode *inode = sb_dqopt(sb)->files[type]; 3182 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 3183 int err = 0; 3184 int offset = off & (sb->s_blocksize - 1); 3185 int tocopy; 3186 size_t toread; 3187 struct buffer_head *bh; 3188 loff_t i_size = i_size_read(inode); 3189 3190 if (off > i_size) 3191 return 0; 3192 if (off+len > i_size) 3193 len = i_size-off; 3194 toread = len; 3195 while (toread > 0) { 3196 tocopy = sb->s_blocksize - offset < toread ? 3197 sb->s_blocksize - offset : toread; 3198 bh = ext4_bread(NULL, inode, blk, 0, &err); 3199 if (err) 3200 return err; 3201 if (!bh) /* A hole? */ 3202 memset(data, 0, tocopy); 3203 else 3204 memcpy(data, bh->b_data+offset, tocopy); 3205 brelse(bh); 3206 offset = 0; 3207 toread -= tocopy; 3208 data += tocopy; 3209 blk++; 3210 } 3211 return len; 3212 } 3213 3214 /* Write to quotafile (we know the transaction is already started and has 3215 * enough credits) */ 3216 static ssize_t ext4_quota_write(struct super_block *sb, int type, 3217 const char *data, size_t len, loff_t off) 3218 { 3219 struct inode *inode = sb_dqopt(sb)->files[type]; 3220 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 3221 int err = 0; 3222 int offset = off & (sb->s_blocksize - 1); 3223 int tocopy; 3224 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL; 3225 size_t towrite = len; 3226 struct buffer_head *bh; 3227 handle_t *handle = journal_current_handle(); 3228 3229 if (!handle) { 3230 printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)" 3231 " cancelled because transaction is not started.\n", 3232 (unsigned long long)off, (unsigned long long)len); 3233 return -EIO; 3234 } 3235 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 3236 while (towrite > 0) { 3237 tocopy = sb->s_blocksize - offset < towrite ? 3238 sb->s_blocksize - offset : towrite; 3239 bh = ext4_bread(handle, inode, blk, 1, &err); 3240 if (!bh) 3241 goto out; 3242 if (journal_quota) { 3243 err = ext4_journal_get_write_access(handle, bh); 3244 if (err) { 3245 brelse(bh); 3246 goto out; 3247 } 3248 } 3249 lock_buffer(bh); 3250 memcpy(bh->b_data+offset, data, tocopy); 3251 flush_dcache_page(bh->b_page); 3252 unlock_buffer(bh); 3253 if (journal_quota) 3254 err = ext4_journal_dirty_metadata(handle, bh); 3255 else { 3256 /* Always do at least ordered writes for quotas */ 3257 err = ext4_journal_dirty_data(handle, bh); 3258 mark_buffer_dirty(bh); 3259 } 3260 brelse(bh); 3261 if (err) 3262 goto out; 3263 offset = 0; 3264 towrite -= tocopy; 3265 data += tocopy; 3266 blk++; 3267 } 3268 out: 3269 if (len == towrite) 3270 return err; 3271 if (inode->i_size < off+len-towrite) { 3272 i_size_write(inode, off+len-towrite); 3273 EXT4_I(inode)->i_disksize = inode->i_size; 3274 } 3275 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 3276 ext4_mark_inode_dirty(handle, inode); 3277 mutex_unlock(&inode->i_mutex); 3278 return len - towrite; 3279 } 3280 3281 #endif 3282 3283 static int ext4_get_sb(struct file_system_type *fs_type, 3284 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 3285 { 3286 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt); 3287 } 3288 3289 static struct file_system_type ext4dev_fs_type = { 3290 .owner = THIS_MODULE, 3291 .name = "ext4dev", 3292 .get_sb = ext4_get_sb, 3293 .kill_sb = kill_block_super, 3294 .fs_flags = FS_REQUIRES_DEV, 3295 }; 3296 3297 static int __init init_ext4_fs(void) 3298 { 3299 int err; 3300 3301 err = init_ext4_mballoc(); 3302 if (err) 3303 return err; 3304 3305 err = init_ext4_xattr(); 3306 if (err) 3307 goto out2; 3308 err = init_inodecache(); 3309 if (err) 3310 goto out1; 3311 err = register_filesystem(&ext4dev_fs_type); 3312 if (err) 3313 goto out; 3314 return 0; 3315 out: 3316 destroy_inodecache(); 3317 out1: 3318 exit_ext4_xattr(); 3319 out2: 3320 exit_ext4_mballoc(); 3321 return err; 3322 } 3323 3324 static void __exit exit_ext4_fs(void) 3325 { 3326 unregister_filesystem(&ext4dev_fs_type); 3327 destroy_inodecache(); 3328 exit_ext4_xattr(); 3329 exit_ext4_mballoc(); 3330 } 3331 3332 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); 3333 MODULE_DESCRIPTION("Fourth Extended Filesystem with extents"); 3334 MODULE_LICENSE("GPL"); 3335 module_init(init_ext4_fs) 3336 module_exit(exit_ext4_fs) 3337