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