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