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/vmalloc.h> 24 #include <linux/jbd2.h> 25 #include <linux/slab.h> 26 #include <linux/init.h> 27 #include <linux/blkdev.h> 28 #include <linux/parser.h> 29 #include <linux/smp_lock.h> 30 #include <linux/buffer_head.h> 31 #include <linux/exportfs.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 #include <linux/proc_fs.h> 39 #include <linux/ctype.h> 40 #include <linux/log2.h> 41 #include <linux/crc16.h> 42 #include <asm/uaccess.h> 43 44 #include "ext4.h" 45 #include "ext4_jbd2.h" 46 #include "xattr.h" 47 #include "acl.h" 48 49 #define CREATE_TRACE_POINTS 50 #include <trace/events/ext4.h> 51 52 static int default_mb_history_length = 1000; 53 54 module_param_named(default_mb_history_length, default_mb_history_length, 55 int, 0644); 56 MODULE_PARM_DESC(default_mb_history_length, 57 "Default number of entries saved for mb_history"); 58 59 struct proc_dir_entry *ext4_proc_root; 60 static struct kset *ext4_kset; 61 62 static int ext4_load_journal(struct super_block *, struct ext4_super_block *, 63 unsigned long journal_devnum); 64 static int ext4_commit_super(struct super_block *sb, int sync); 65 static void ext4_mark_recovery_complete(struct super_block *sb, 66 struct ext4_super_block *es); 67 static void ext4_clear_journal_err(struct super_block *sb, 68 struct ext4_super_block *es); 69 static int ext4_sync_fs(struct super_block *sb, int wait); 70 static const char *ext4_decode_error(struct super_block *sb, int errno, 71 char nbuf[16]); 72 static int ext4_remount(struct super_block *sb, int *flags, char *data); 73 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf); 74 static int ext4_unfreeze(struct super_block *sb); 75 static void ext4_write_super(struct super_block *sb); 76 static int ext4_freeze(struct super_block *sb); 77 78 79 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 80 struct ext4_group_desc *bg) 81 { 82 return le32_to_cpu(bg->bg_block_bitmap_lo) | 83 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 84 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); 85 } 86 87 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 88 struct ext4_group_desc *bg) 89 { 90 return le32_to_cpu(bg->bg_inode_bitmap_lo) | 91 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 92 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); 93 } 94 95 ext4_fsblk_t ext4_inode_table(struct super_block *sb, 96 struct ext4_group_desc *bg) 97 { 98 return le32_to_cpu(bg->bg_inode_table_lo) | 99 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 100 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); 101 } 102 103 __u32 ext4_free_blks_count(struct super_block *sb, 104 struct ext4_group_desc *bg) 105 { 106 return le16_to_cpu(bg->bg_free_blocks_count_lo) | 107 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 108 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0); 109 } 110 111 __u32 ext4_free_inodes_count(struct super_block *sb, 112 struct ext4_group_desc *bg) 113 { 114 return le16_to_cpu(bg->bg_free_inodes_count_lo) | 115 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 116 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0); 117 } 118 119 __u32 ext4_used_dirs_count(struct super_block *sb, 120 struct ext4_group_desc *bg) 121 { 122 return le16_to_cpu(bg->bg_used_dirs_count_lo) | 123 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 124 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0); 125 } 126 127 __u32 ext4_itable_unused_count(struct super_block *sb, 128 struct ext4_group_desc *bg) 129 { 130 return le16_to_cpu(bg->bg_itable_unused_lo) | 131 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 132 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0); 133 } 134 135 void ext4_block_bitmap_set(struct super_block *sb, 136 struct ext4_group_desc *bg, ext4_fsblk_t blk) 137 { 138 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); 139 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 140 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); 141 } 142 143 void ext4_inode_bitmap_set(struct super_block *sb, 144 struct ext4_group_desc *bg, ext4_fsblk_t blk) 145 { 146 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); 147 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 148 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); 149 } 150 151 void ext4_inode_table_set(struct super_block *sb, 152 struct ext4_group_desc *bg, ext4_fsblk_t blk) 153 { 154 bg->bg_inode_table_lo = cpu_to_le32((u32)blk); 155 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 156 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); 157 } 158 159 void ext4_free_blks_set(struct super_block *sb, 160 struct ext4_group_desc *bg, __u32 count) 161 { 162 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count); 163 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 164 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16); 165 } 166 167 void ext4_free_inodes_set(struct super_block *sb, 168 struct ext4_group_desc *bg, __u32 count) 169 { 170 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count); 171 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 172 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16); 173 } 174 175 void ext4_used_dirs_set(struct super_block *sb, 176 struct ext4_group_desc *bg, __u32 count) 177 { 178 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count); 179 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 180 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16); 181 } 182 183 void ext4_itable_unused_set(struct super_block *sb, 184 struct ext4_group_desc *bg, __u32 count) 185 { 186 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count); 187 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 188 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16); 189 } 190 191 /* 192 * Wrappers for jbd2_journal_start/end. 193 * 194 * The only special thing we need to do here is to make sure that all 195 * journal_end calls result in the superblock being marked dirty, so 196 * that sync() will call the filesystem's write_super callback if 197 * appropriate. 198 */ 199 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) 200 { 201 journal_t *journal; 202 203 if (sb->s_flags & MS_RDONLY) 204 return ERR_PTR(-EROFS); 205 206 /* Special case here: if the journal has aborted behind our 207 * backs (eg. EIO in the commit thread), then we still need to 208 * take the FS itself readonly cleanly. */ 209 journal = EXT4_SB(sb)->s_journal; 210 if (journal) { 211 if (is_journal_aborted(journal)) { 212 ext4_abort(sb, __func__, "Detected aborted journal"); 213 return ERR_PTR(-EROFS); 214 } 215 return jbd2_journal_start(journal, nblocks); 216 } 217 /* 218 * We're not journaling, return the appropriate indication. 219 */ 220 current->journal_info = EXT4_NOJOURNAL_HANDLE; 221 return current->journal_info; 222 } 223 224 /* 225 * The only special thing we need to do here is to make sure that all 226 * jbd2_journal_stop calls result in the superblock being marked dirty, so 227 * that sync() will call the filesystem's write_super callback if 228 * appropriate. 229 */ 230 int __ext4_journal_stop(const char *where, handle_t *handle) 231 { 232 struct super_block *sb; 233 int err; 234 int rc; 235 236 if (!ext4_handle_valid(handle)) { 237 /* 238 * Do this here since we don't call jbd2_journal_stop() in 239 * no-journal mode. 240 */ 241 current->journal_info = NULL; 242 return 0; 243 } 244 sb = handle->h_transaction->t_journal->j_private; 245 err = handle->h_err; 246 rc = jbd2_journal_stop(handle); 247 248 if (!err) 249 err = rc; 250 if (err) 251 __ext4_std_error(sb, where, err); 252 return err; 253 } 254 255 void ext4_journal_abort_handle(const char *caller, const char *err_fn, 256 struct buffer_head *bh, handle_t *handle, int err) 257 { 258 char nbuf[16]; 259 const char *errstr = ext4_decode_error(NULL, err, nbuf); 260 261 BUG_ON(!ext4_handle_valid(handle)); 262 263 if (bh) 264 BUFFER_TRACE(bh, "abort"); 265 266 if (!handle->h_err) 267 handle->h_err = err; 268 269 if (is_handle_aborted(handle)) 270 return; 271 272 printk(KERN_ERR "%s: aborting transaction: %s in %s\n", 273 caller, errstr, err_fn); 274 275 jbd2_journal_abort_handle(handle); 276 } 277 278 /* Deal with the reporting of failure conditions on a filesystem such as 279 * inconsistencies detected or read IO failures. 280 * 281 * On ext2, we can store the error state of the filesystem in the 282 * superblock. That is not possible on ext4, because we may have other 283 * write ordering constraints on the superblock which prevent us from 284 * writing it out straight away; and given that the journal is about to 285 * be aborted, we can't rely on the current, or future, transactions to 286 * write out the superblock safely. 287 * 288 * We'll just use the jbd2_journal_abort() error code to record an error in 289 * the journal instead. On recovery, the journal will compain about 290 * that error until we've noted it down and cleared it. 291 */ 292 293 static void ext4_handle_error(struct super_block *sb) 294 { 295 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 296 297 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 298 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 299 300 if (sb->s_flags & MS_RDONLY) 301 return; 302 303 if (!test_opt(sb, ERRORS_CONT)) { 304 journal_t *journal = EXT4_SB(sb)->s_journal; 305 306 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; 307 if (journal) 308 jbd2_journal_abort(journal, -EIO); 309 } 310 if (test_opt(sb, ERRORS_RO)) { 311 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); 312 sb->s_flags |= MS_RDONLY; 313 } 314 ext4_commit_super(sb, 1); 315 if (test_opt(sb, ERRORS_PANIC)) 316 panic("EXT4-fs (device %s): panic forced after error\n", 317 sb->s_id); 318 } 319 320 void ext4_error(struct super_block *sb, const char *function, 321 const char *fmt, ...) 322 { 323 va_list args; 324 325 va_start(args, fmt); 326 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function); 327 vprintk(fmt, args); 328 printk("\n"); 329 va_end(args); 330 331 ext4_handle_error(sb); 332 } 333 334 static const char *ext4_decode_error(struct super_block *sb, int errno, 335 char nbuf[16]) 336 { 337 char *errstr = NULL; 338 339 switch (errno) { 340 case -EIO: 341 errstr = "IO failure"; 342 break; 343 case -ENOMEM: 344 errstr = "Out of memory"; 345 break; 346 case -EROFS: 347 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT) 348 errstr = "Journal has aborted"; 349 else 350 errstr = "Readonly filesystem"; 351 break; 352 default: 353 /* If the caller passed in an extra buffer for unknown 354 * errors, textualise them now. Else we just return 355 * NULL. */ 356 if (nbuf) { 357 /* Check for truncated error codes... */ 358 if (snprintf(nbuf, 16, "error %d", -errno) >= 0) 359 errstr = nbuf; 360 } 361 break; 362 } 363 364 return errstr; 365 } 366 367 /* __ext4_std_error decodes expected errors from journaling functions 368 * automatically and invokes the appropriate error response. */ 369 370 void __ext4_std_error(struct super_block *sb, const char *function, int errno) 371 { 372 char nbuf[16]; 373 const char *errstr; 374 375 /* Special case: if the error is EROFS, and we're not already 376 * inside a transaction, then there's really no point in logging 377 * an error. */ 378 if (errno == -EROFS && journal_current_handle() == NULL && 379 (sb->s_flags & MS_RDONLY)) 380 return; 381 382 errstr = ext4_decode_error(sb, errno, nbuf); 383 printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n", 384 sb->s_id, function, errstr); 385 386 ext4_handle_error(sb); 387 } 388 389 /* 390 * ext4_abort is a much stronger failure handler than ext4_error. The 391 * abort function may be used to deal with unrecoverable failures such 392 * as journal IO errors or ENOMEM at a critical moment in log management. 393 * 394 * We unconditionally force the filesystem into an ABORT|READONLY state, 395 * unless the error response on the fs has been set to panic in which 396 * case we take the easy way out and panic immediately. 397 */ 398 399 void ext4_abort(struct super_block *sb, const char *function, 400 const char *fmt, ...) 401 { 402 va_list args; 403 404 va_start(args, fmt); 405 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function); 406 vprintk(fmt, args); 407 printk("\n"); 408 va_end(args); 409 410 if (test_opt(sb, ERRORS_PANIC)) 411 panic("EXT4-fs panic from previous error\n"); 412 413 if (sb->s_flags & MS_RDONLY) 414 return; 415 416 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); 417 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 418 sb->s_flags |= MS_RDONLY; 419 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; 420 if (EXT4_SB(sb)->s_journal) 421 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); 422 } 423 424 void ext4_msg (struct super_block * sb, const char *prefix, 425 const char *fmt, ...) 426 { 427 va_list args; 428 429 va_start(args, fmt); 430 printk("%sEXT4-fs (%s): ", prefix, sb->s_id); 431 vprintk(fmt, args); 432 printk("\n"); 433 va_end(args); 434 } 435 436 void ext4_warning(struct super_block *sb, const char *function, 437 const char *fmt, ...) 438 { 439 va_list args; 440 441 va_start(args, fmt); 442 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ", 443 sb->s_id, function); 444 vprintk(fmt, args); 445 printk("\n"); 446 va_end(args); 447 } 448 449 void ext4_grp_locked_error(struct super_block *sb, ext4_group_t grp, 450 const char *function, const char *fmt, ...) 451 __releases(bitlock) 452 __acquires(bitlock) 453 { 454 va_list args; 455 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 456 457 va_start(args, fmt); 458 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function); 459 vprintk(fmt, args); 460 printk("\n"); 461 va_end(args); 462 463 if (test_opt(sb, ERRORS_CONT)) { 464 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 465 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 466 ext4_commit_super(sb, 0); 467 return; 468 } 469 ext4_unlock_group(sb, grp); 470 ext4_handle_error(sb); 471 /* 472 * We only get here in the ERRORS_RO case; relocking the group 473 * may be dangerous, but nothing bad will happen since the 474 * filesystem will have already been marked read/only and the 475 * journal has been aborted. We return 1 as a hint to callers 476 * who might what to use the return value from 477 * ext4_grp_locked_error() to distinguish beween the 478 * ERRORS_CONT and ERRORS_RO case, and perhaps return more 479 * aggressively from the ext4 function in question, with a 480 * more appropriate error code. 481 */ 482 ext4_lock_group(sb, grp); 483 return; 484 } 485 486 void ext4_update_dynamic_rev(struct super_block *sb) 487 { 488 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 489 490 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) 491 return; 492 493 ext4_warning(sb, __func__, 494 "updating to rev %d because of new feature flag, " 495 "running e2fsck is recommended", 496 EXT4_DYNAMIC_REV); 497 498 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); 499 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); 500 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); 501 /* leave es->s_feature_*compat flags alone */ 502 /* es->s_uuid will be set by e2fsck if empty */ 503 504 /* 505 * The rest of the superblock fields should be zero, and if not it 506 * means they are likely already in use, so leave them alone. We 507 * can leave it up to e2fsck to clean up any inconsistencies there. 508 */ 509 } 510 511 /* 512 * Open the external journal device 513 */ 514 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb) 515 { 516 struct block_device *bdev; 517 char b[BDEVNAME_SIZE]; 518 519 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); 520 if (IS_ERR(bdev)) 521 goto fail; 522 return bdev; 523 524 fail: 525 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld", 526 __bdevname(dev, b), PTR_ERR(bdev)); 527 return NULL; 528 } 529 530 /* 531 * Release the journal device 532 */ 533 static int ext4_blkdev_put(struct block_device *bdev) 534 { 535 bd_release(bdev); 536 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE); 537 } 538 539 static int ext4_blkdev_remove(struct ext4_sb_info *sbi) 540 { 541 struct block_device *bdev; 542 int ret = -ENODEV; 543 544 bdev = sbi->journal_bdev; 545 if (bdev) { 546 ret = ext4_blkdev_put(bdev); 547 sbi->journal_bdev = NULL; 548 } 549 return ret; 550 } 551 552 static inline struct inode *orphan_list_entry(struct list_head *l) 553 { 554 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; 555 } 556 557 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) 558 { 559 struct list_head *l; 560 561 ext4_msg(sb, KERN_ERR, "sb orphan head is %d", 562 le32_to_cpu(sbi->s_es->s_last_orphan)); 563 564 printk(KERN_ERR "sb_info orphan list:\n"); 565 list_for_each(l, &sbi->s_orphan) { 566 struct inode *inode = orphan_list_entry(l); 567 printk(KERN_ERR " " 568 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", 569 inode->i_sb->s_id, inode->i_ino, inode, 570 inode->i_mode, inode->i_nlink, 571 NEXT_ORPHAN(inode)); 572 } 573 } 574 575 static void ext4_put_super(struct super_block *sb) 576 { 577 struct ext4_sb_info *sbi = EXT4_SB(sb); 578 struct ext4_super_block *es = sbi->s_es; 579 int i, err; 580 581 lock_super(sb); 582 lock_kernel(); 583 if (sb->s_dirt) 584 ext4_commit_super(sb, 1); 585 586 ext4_release_system_zone(sb); 587 ext4_mb_release(sb); 588 ext4_ext_release(sb); 589 ext4_xattr_put_super(sb); 590 if (sbi->s_journal) { 591 err = jbd2_journal_destroy(sbi->s_journal); 592 sbi->s_journal = NULL; 593 if (err < 0) 594 ext4_abort(sb, __func__, 595 "Couldn't clean up the journal"); 596 } 597 if (!(sb->s_flags & MS_RDONLY)) { 598 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 599 es->s_state = cpu_to_le16(sbi->s_mount_state); 600 ext4_commit_super(sb, 1); 601 } 602 if (sbi->s_proc) { 603 remove_proc_entry(sb->s_id, ext4_proc_root); 604 } 605 kobject_del(&sbi->s_kobj); 606 607 for (i = 0; i < sbi->s_gdb_count; i++) 608 brelse(sbi->s_group_desc[i]); 609 kfree(sbi->s_group_desc); 610 if (is_vmalloc_addr(sbi->s_flex_groups)) 611 vfree(sbi->s_flex_groups); 612 else 613 kfree(sbi->s_flex_groups); 614 percpu_counter_destroy(&sbi->s_freeblocks_counter); 615 percpu_counter_destroy(&sbi->s_freeinodes_counter); 616 percpu_counter_destroy(&sbi->s_dirs_counter); 617 percpu_counter_destroy(&sbi->s_dirtyblocks_counter); 618 brelse(sbi->s_sbh); 619 #ifdef CONFIG_QUOTA 620 for (i = 0; i < MAXQUOTAS; i++) 621 kfree(sbi->s_qf_names[i]); 622 #endif 623 624 /* Debugging code just in case the in-memory inode orphan list 625 * isn't empty. The on-disk one can be non-empty if we've 626 * detected an error and taken the fs readonly, but the 627 * in-memory list had better be clean by this point. */ 628 if (!list_empty(&sbi->s_orphan)) 629 dump_orphan_list(sb, sbi); 630 J_ASSERT(list_empty(&sbi->s_orphan)); 631 632 invalidate_bdev(sb->s_bdev); 633 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { 634 /* 635 * Invalidate the journal device's buffers. We don't want them 636 * floating about in memory - the physical journal device may 637 * hotswapped, and it breaks the `ro-after' testing code. 638 */ 639 sync_blockdev(sbi->journal_bdev); 640 invalidate_bdev(sbi->journal_bdev); 641 ext4_blkdev_remove(sbi); 642 } 643 sb->s_fs_info = NULL; 644 /* 645 * Now that we are completely done shutting down the 646 * superblock, we need to actually destroy the kobject. 647 */ 648 unlock_kernel(); 649 unlock_super(sb); 650 kobject_put(&sbi->s_kobj); 651 wait_for_completion(&sbi->s_kobj_unregister); 652 kfree(sbi->s_blockgroup_lock); 653 kfree(sbi); 654 } 655 656 static struct kmem_cache *ext4_inode_cachep; 657 658 /* 659 * Called inside transaction, so use GFP_NOFS 660 */ 661 static struct inode *ext4_alloc_inode(struct super_block *sb) 662 { 663 struct ext4_inode_info *ei; 664 665 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); 666 if (!ei) 667 return NULL; 668 669 #ifdef CONFIG_EXT4_FS_POSIX_ACL 670 ei->i_acl = EXT4_ACL_NOT_CACHED; 671 ei->i_default_acl = EXT4_ACL_NOT_CACHED; 672 #endif 673 ei->vfs_inode.i_version = 1; 674 ei->vfs_inode.i_data.writeback_index = 0; 675 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); 676 INIT_LIST_HEAD(&ei->i_prealloc_list); 677 spin_lock_init(&ei->i_prealloc_lock); 678 /* 679 * Note: We can be called before EXT4_SB(sb)->s_journal is set, 680 * therefore it can be null here. Don't check it, just initialize 681 * jinode. 682 */ 683 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode); 684 ei->i_reserved_data_blocks = 0; 685 ei->i_reserved_meta_blocks = 0; 686 ei->i_allocated_meta_blocks = 0; 687 ei->i_delalloc_reserved_flag = 0; 688 spin_lock_init(&(ei->i_block_reservation_lock)); 689 690 return &ei->vfs_inode; 691 } 692 693 static void ext4_destroy_inode(struct inode *inode) 694 { 695 if (!list_empty(&(EXT4_I(inode)->i_orphan))) { 696 ext4_msg(inode->i_sb, KERN_ERR, 697 "Inode %lu (%p): orphan list check failed!", 698 inode->i_ino, EXT4_I(inode)); 699 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, 700 EXT4_I(inode), sizeof(struct ext4_inode_info), 701 true); 702 dump_stack(); 703 } 704 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); 705 } 706 707 static void init_once(void *foo) 708 { 709 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; 710 711 INIT_LIST_HEAD(&ei->i_orphan); 712 #ifdef CONFIG_EXT4_FS_XATTR 713 init_rwsem(&ei->xattr_sem); 714 #endif 715 init_rwsem(&ei->i_data_sem); 716 inode_init_once(&ei->vfs_inode); 717 } 718 719 static int init_inodecache(void) 720 { 721 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", 722 sizeof(struct ext4_inode_info), 723 0, (SLAB_RECLAIM_ACCOUNT| 724 SLAB_MEM_SPREAD), 725 init_once); 726 if (ext4_inode_cachep == NULL) 727 return -ENOMEM; 728 return 0; 729 } 730 731 static void destroy_inodecache(void) 732 { 733 kmem_cache_destroy(ext4_inode_cachep); 734 } 735 736 static void ext4_clear_inode(struct inode *inode) 737 { 738 #ifdef CONFIG_EXT4_FS_POSIX_ACL 739 if (EXT4_I(inode)->i_acl && 740 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) { 741 posix_acl_release(EXT4_I(inode)->i_acl); 742 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED; 743 } 744 if (EXT4_I(inode)->i_default_acl && 745 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) { 746 posix_acl_release(EXT4_I(inode)->i_default_acl); 747 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED; 748 } 749 #endif 750 ext4_discard_preallocations(inode); 751 if (EXT4_JOURNAL(inode)) 752 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal, 753 &EXT4_I(inode)->jinode); 754 } 755 756 static inline void ext4_show_quota_options(struct seq_file *seq, 757 struct super_block *sb) 758 { 759 #if defined(CONFIG_QUOTA) 760 struct ext4_sb_info *sbi = EXT4_SB(sb); 761 762 if (sbi->s_jquota_fmt) 763 seq_printf(seq, ",jqfmt=%s", 764 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold" : "vfsv0"); 765 766 if (sbi->s_qf_names[USRQUOTA]) 767 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); 768 769 if (sbi->s_qf_names[GRPQUOTA]) 770 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); 771 772 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) 773 seq_puts(seq, ",usrquota"); 774 775 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) 776 seq_puts(seq, ",grpquota"); 777 #endif 778 } 779 780 /* 781 * Show an option if 782 * - it's set to a non-default value OR 783 * - if the per-sb default is different from the global default 784 */ 785 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs) 786 { 787 int def_errors; 788 unsigned long def_mount_opts; 789 struct super_block *sb = vfs->mnt_sb; 790 struct ext4_sb_info *sbi = EXT4_SB(sb); 791 struct ext4_super_block *es = sbi->s_es; 792 793 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 794 def_errors = le16_to_cpu(es->s_errors); 795 796 if (sbi->s_sb_block != 1) 797 seq_printf(seq, ",sb=%llu", sbi->s_sb_block); 798 if (test_opt(sb, MINIX_DF)) 799 seq_puts(seq, ",minixdf"); 800 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS)) 801 seq_puts(seq, ",grpid"); 802 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS)) 803 seq_puts(seq, ",nogrpid"); 804 if (sbi->s_resuid != EXT4_DEF_RESUID || 805 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) { 806 seq_printf(seq, ",resuid=%u", sbi->s_resuid); 807 } 808 if (sbi->s_resgid != EXT4_DEF_RESGID || 809 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) { 810 seq_printf(seq, ",resgid=%u", sbi->s_resgid); 811 } 812 if (test_opt(sb, ERRORS_RO)) { 813 if (def_errors == EXT4_ERRORS_PANIC || 814 def_errors == EXT4_ERRORS_CONTINUE) { 815 seq_puts(seq, ",errors=remount-ro"); 816 } 817 } 818 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) 819 seq_puts(seq, ",errors=continue"); 820 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) 821 seq_puts(seq, ",errors=panic"); 822 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16)) 823 seq_puts(seq, ",nouid32"); 824 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG)) 825 seq_puts(seq, ",debug"); 826 if (test_opt(sb, OLDALLOC)) 827 seq_puts(seq, ",oldalloc"); 828 #ifdef CONFIG_EXT4_FS_XATTR 829 if (test_opt(sb, XATTR_USER) && 830 !(def_mount_opts & EXT4_DEFM_XATTR_USER)) 831 seq_puts(seq, ",user_xattr"); 832 if (!test_opt(sb, XATTR_USER) && 833 (def_mount_opts & EXT4_DEFM_XATTR_USER)) { 834 seq_puts(seq, ",nouser_xattr"); 835 } 836 #endif 837 #ifdef CONFIG_EXT4_FS_POSIX_ACL 838 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL)) 839 seq_puts(seq, ",acl"); 840 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL)) 841 seq_puts(seq, ",noacl"); 842 #endif 843 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) { 844 seq_printf(seq, ",commit=%u", 845 (unsigned) (sbi->s_commit_interval / HZ)); 846 } 847 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) { 848 seq_printf(seq, ",min_batch_time=%u", 849 (unsigned) sbi->s_min_batch_time); 850 } 851 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) { 852 seq_printf(seq, ",max_batch_time=%u", 853 (unsigned) sbi->s_min_batch_time); 854 } 855 856 /* 857 * We're changing the default of barrier mount option, so 858 * let's always display its mount state so it's clear what its 859 * status is. 860 */ 861 seq_puts(seq, ",barrier="); 862 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0"); 863 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) 864 seq_puts(seq, ",journal_async_commit"); 865 if (test_opt(sb, NOBH)) 866 seq_puts(seq, ",nobh"); 867 if (test_opt(sb, I_VERSION)) 868 seq_puts(seq, ",i_version"); 869 if (!test_opt(sb, DELALLOC)) 870 seq_puts(seq, ",nodelalloc"); 871 872 873 if (sbi->s_stripe) 874 seq_printf(seq, ",stripe=%lu", sbi->s_stripe); 875 /* 876 * journal mode get enabled in different ways 877 * So just print the value even if we didn't specify it 878 */ 879 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 880 seq_puts(seq, ",data=journal"); 881 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 882 seq_puts(seq, ",data=ordered"); 883 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) 884 seq_puts(seq, ",data=writeback"); 885 886 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS) 887 seq_printf(seq, ",inode_readahead_blks=%u", 888 sbi->s_inode_readahead_blks); 889 890 if (test_opt(sb, DATA_ERR_ABORT)) 891 seq_puts(seq, ",data_err=abort"); 892 893 if (test_opt(sb, NO_AUTO_DA_ALLOC)) 894 seq_puts(seq, ",noauto_da_alloc"); 895 896 ext4_show_quota_options(seq, sb); 897 898 return 0; 899 } 900 901 static struct inode *ext4_nfs_get_inode(struct super_block *sb, 902 u64 ino, u32 generation) 903 { 904 struct inode *inode; 905 906 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) 907 return ERR_PTR(-ESTALE); 908 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) 909 return ERR_PTR(-ESTALE); 910 911 /* iget isn't really right if the inode is currently unallocated!! 912 * 913 * ext4_read_inode will return a bad_inode if the inode had been 914 * deleted, so we should be safe. 915 * 916 * Currently we don't know the generation for parent directory, so 917 * a generation of 0 means "accept any" 918 */ 919 inode = ext4_iget(sb, ino); 920 if (IS_ERR(inode)) 921 return ERR_CAST(inode); 922 if (generation && inode->i_generation != generation) { 923 iput(inode); 924 return ERR_PTR(-ESTALE); 925 } 926 927 return inode; 928 } 929 930 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, 931 int fh_len, int fh_type) 932 { 933 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 934 ext4_nfs_get_inode); 935 } 936 937 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, 938 int fh_len, int fh_type) 939 { 940 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 941 ext4_nfs_get_inode); 942 } 943 944 /* 945 * Try to release metadata pages (indirect blocks, directories) which are 946 * mapped via the block device. Since these pages could have journal heads 947 * which would prevent try_to_free_buffers() from freeing them, we must use 948 * jbd2 layer's try_to_free_buffers() function to release them. 949 */ 950 static int bdev_try_to_free_page(struct super_block *sb, struct page *page, 951 gfp_t wait) 952 { 953 journal_t *journal = EXT4_SB(sb)->s_journal; 954 955 WARN_ON(PageChecked(page)); 956 if (!page_has_buffers(page)) 957 return 0; 958 if (journal) 959 return jbd2_journal_try_to_free_buffers(journal, page, 960 wait & ~__GFP_WAIT); 961 return try_to_free_buffers(page); 962 } 963 964 #ifdef CONFIG_QUOTA 965 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group") 966 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) 967 968 static int ext4_write_dquot(struct dquot *dquot); 969 static int ext4_acquire_dquot(struct dquot *dquot); 970 static int ext4_release_dquot(struct dquot *dquot); 971 static int ext4_mark_dquot_dirty(struct dquot *dquot); 972 static int ext4_write_info(struct super_block *sb, int type); 973 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 974 char *path, int remount); 975 static int ext4_quota_on_mount(struct super_block *sb, int type); 976 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 977 size_t len, loff_t off); 978 static ssize_t ext4_quota_write(struct super_block *sb, int type, 979 const char *data, size_t len, loff_t off); 980 981 static struct dquot_operations ext4_quota_operations = { 982 .initialize = dquot_initialize, 983 .drop = dquot_drop, 984 .alloc_space = dquot_alloc_space, 985 .reserve_space = dquot_reserve_space, 986 .claim_space = dquot_claim_space, 987 .release_rsv = dquot_release_reserved_space, 988 .get_reserved_space = ext4_get_reserved_space, 989 .alloc_inode = dquot_alloc_inode, 990 .free_space = dquot_free_space, 991 .free_inode = dquot_free_inode, 992 .transfer = dquot_transfer, 993 .write_dquot = ext4_write_dquot, 994 .acquire_dquot = ext4_acquire_dquot, 995 .release_dquot = ext4_release_dquot, 996 .mark_dirty = ext4_mark_dquot_dirty, 997 .write_info = ext4_write_info, 998 .alloc_dquot = dquot_alloc, 999 .destroy_dquot = dquot_destroy, 1000 }; 1001 1002 static struct quotactl_ops ext4_qctl_operations = { 1003 .quota_on = ext4_quota_on, 1004 .quota_off = vfs_quota_off, 1005 .quota_sync = vfs_quota_sync, 1006 .get_info = vfs_get_dqinfo, 1007 .set_info = vfs_set_dqinfo, 1008 .get_dqblk = vfs_get_dqblk, 1009 .set_dqblk = vfs_set_dqblk 1010 }; 1011 #endif 1012 1013 static const struct super_operations ext4_sops = { 1014 .alloc_inode = ext4_alloc_inode, 1015 .destroy_inode = ext4_destroy_inode, 1016 .write_inode = ext4_write_inode, 1017 .dirty_inode = ext4_dirty_inode, 1018 .delete_inode = ext4_delete_inode, 1019 .put_super = ext4_put_super, 1020 .sync_fs = ext4_sync_fs, 1021 .freeze_fs = ext4_freeze, 1022 .unfreeze_fs = ext4_unfreeze, 1023 .statfs = ext4_statfs, 1024 .remount_fs = ext4_remount, 1025 .clear_inode = ext4_clear_inode, 1026 .show_options = ext4_show_options, 1027 #ifdef CONFIG_QUOTA 1028 .quota_read = ext4_quota_read, 1029 .quota_write = ext4_quota_write, 1030 #endif 1031 .bdev_try_to_free_page = bdev_try_to_free_page, 1032 }; 1033 1034 static const struct super_operations ext4_nojournal_sops = { 1035 .alloc_inode = ext4_alloc_inode, 1036 .destroy_inode = ext4_destroy_inode, 1037 .write_inode = ext4_write_inode, 1038 .dirty_inode = ext4_dirty_inode, 1039 .delete_inode = ext4_delete_inode, 1040 .write_super = ext4_write_super, 1041 .put_super = ext4_put_super, 1042 .statfs = ext4_statfs, 1043 .remount_fs = ext4_remount, 1044 .clear_inode = ext4_clear_inode, 1045 .show_options = ext4_show_options, 1046 #ifdef CONFIG_QUOTA 1047 .quota_read = ext4_quota_read, 1048 .quota_write = ext4_quota_write, 1049 #endif 1050 .bdev_try_to_free_page = bdev_try_to_free_page, 1051 }; 1052 1053 static const struct export_operations ext4_export_ops = { 1054 .fh_to_dentry = ext4_fh_to_dentry, 1055 .fh_to_parent = ext4_fh_to_parent, 1056 .get_parent = ext4_get_parent, 1057 }; 1058 1059 enum { 1060 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 1061 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, 1062 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov, 1063 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, 1064 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh, 1065 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, 1066 Opt_journal_update, Opt_journal_dev, 1067 Opt_journal_checksum, Opt_journal_async_commit, 1068 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, 1069 Opt_data_err_abort, Opt_data_err_ignore, Opt_mb_history_length, 1070 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, 1071 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota, 1072 Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err, Opt_resize, 1073 Opt_usrquota, Opt_grpquota, Opt_i_version, 1074 Opt_stripe, Opt_delalloc, Opt_nodelalloc, 1075 Opt_block_validity, Opt_noblock_validity, 1076 Opt_inode_readahead_blks, Opt_journal_ioprio 1077 }; 1078 1079 static const match_table_t tokens = { 1080 {Opt_bsd_df, "bsddf"}, 1081 {Opt_minix_df, "minixdf"}, 1082 {Opt_grpid, "grpid"}, 1083 {Opt_grpid, "bsdgroups"}, 1084 {Opt_nogrpid, "nogrpid"}, 1085 {Opt_nogrpid, "sysvgroups"}, 1086 {Opt_resgid, "resgid=%u"}, 1087 {Opt_resuid, "resuid=%u"}, 1088 {Opt_sb, "sb=%u"}, 1089 {Opt_err_cont, "errors=continue"}, 1090 {Opt_err_panic, "errors=panic"}, 1091 {Opt_err_ro, "errors=remount-ro"}, 1092 {Opt_nouid32, "nouid32"}, 1093 {Opt_debug, "debug"}, 1094 {Opt_oldalloc, "oldalloc"}, 1095 {Opt_orlov, "orlov"}, 1096 {Opt_user_xattr, "user_xattr"}, 1097 {Opt_nouser_xattr, "nouser_xattr"}, 1098 {Opt_acl, "acl"}, 1099 {Opt_noacl, "noacl"}, 1100 {Opt_noload, "noload"}, 1101 {Opt_nobh, "nobh"}, 1102 {Opt_bh, "bh"}, 1103 {Opt_commit, "commit=%u"}, 1104 {Opt_min_batch_time, "min_batch_time=%u"}, 1105 {Opt_max_batch_time, "max_batch_time=%u"}, 1106 {Opt_journal_update, "journal=update"}, 1107 {Opt_journal_dev, "journal_dev=%u"}, 1108 {Opt_journal_checksum, "journal_checksum"}, 1109 {Opt_journal_async_commit, "journal_async_commit"}, 1110 {Opt_abort, "abort"}, 1111 {Opt_data_journal, "data=journal"}, 1112 {Opt_data_ordered, "data=ordered"}, 1113 {Opt_data_writeback, "data=writeback"}, 1114 {Opt_data_err_abort, "data_err=abort"}, 1115 {Opt_data_err_ignore, "data_err=ignore"}, 1116 {Opt_mb_history_length, "mb_history_length=%u"}, 1117 {Opt_offusrjquota, "usrjquota="}, 1118 {Opt_usrjquota, "usrjquota=%s"}, 1119 {Opt_offgrpjquota, "grpjquota="}, 1120 {Opt_grpjquota, "grpjquota=%s"}, 1121 {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, 1122 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, 1123 {Opt_grpquota, "grpquota"}, 1124 {Opt_noquota, "noquota"}, 1125 {Opt_quota, "quota"}, 1126 {Opt_usrquota, "usrquota"}, 1127 {Opt_barrier, "barrier=%u"}, 1128 {Opt_barrier, "barrier"}, 1129 {Opt_nobarrier, "nobarrier"}, 1130 {Opt_i_version, "i_version"}, 1131 {Opt_stripe, "stripe=%u"}, 1132 {Opt_resize, "resize"}, 1133 {Opt_delalloc, "delalloc"}, 1134 {Opt_nodelalloc, "nodelalloc"}, 1135 {Opt_block_validity, "block_validity"}, 1136 {Opt_noblock_validity, "noblock_validity"}, 1137 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"}, 1138 {Opt_journal_ioprio, "journal_ioprio=%u"}, 1139 {Opt_auto_da_alloc, "auto_da_alloc=%u"}, 1140 {Opt_auto_da_alloc, "auto_da_alloc"}, 1141 {Opt_noauto_da_alloc, "noauto_da_alloc"}, 1142 {Opt_err, NULL}, 1143 }; 1144 1145 static ext4_fsblk_t get_sb_block(void **data) 1146 { 1147 ext4_fsblk_t sb_block; 1148 char *options = (char *) *data; 1149 1150 if (!options || strncmp(options, "sb=", 3) != 0) 1151 return 1; /* Default location */ 1152 1153 options += 3; 1154 /* TODO: use simple_strtoll with >32bit ext4 */ 1155 sb_block = simple_strtoul(options, &options, 0); 1156 if (*options && *options != ',') { 1157 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n", 1158 (char *) *data); 1159 return 1; 1160 } 1161 if (*options == ',') 1162 options++; 1163 *data = (void *) options; 1164 1165 return sb_block; 1166 } 1167 1168 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3)) 1169 1170 static int parse_options(char *options, struct super_block *sb, 1171 unsigned long *journal_devnum, 1172 unsigned int *journal_ioprio, 1173 ext4_fsblk_t *n_blocks_count, int is_remount) 1174 { 1175 struct ext4_sb_info *sbi = EXT4_SB(sb); 1176 char *p; 1177 substring_t args[MAX_OPT_ARGS]; 1178 int data_opt = 0; 1179 int option; 1180 #ifdef CONFIG_QUOTA 1181 int qtype, qfmt; 1182 char *qname; 1183 #endif 1184 1185 if (!options) 1186 return 1; 1187 1188 while ((p = strsep(&options, ",")) != NULL) { 1189 int token; 1190 if (!*p) 1191 continue; 1192 1193 token = match_token(p, tokens, args); 1194 switch (token) { 1195 case Opt_bsd_df: 1196 clear_opt(sbi->s_mount_opt, MINIX_DF); 1197 break; 1198 case Opt_minix_df: 1199 set_opt(sbi->s_mount_opt, MINIX_DF); 1200 break; 1201 case Opt_grpid: 1202 set_opt(sbi->s_mount_opt, GRPID); 1203 break; 1204 case Opt_nogrpid: 1205 clear_opt(sbi->s_mount_opt, GRPID); 1206 break; 1207 case Opt_resuid: 1208 if (match_int(&args[0], &option)) 1209 return 0; 1210 sbi->s_resuid = option; 1211 break; 1212 case Opt_resgid: 1213 if (match_int(&args[0], &option)) 1214 return 0; 1215 sbi->s_resgid = option; 1216 break; 1217 case Opt_sb: 1218 /* handled by get_sb_block() instead of here */ 1219 /* *sb_block = match_int(&args[0]); */ 1220 break; 1221 case Opt_err_panic: 1222 clear_opt(sbi->s_mount_opt, ERRORS_CONT); 1223 clear_opt(sbi->s_mount_opt, ERRORS_RO); 1224 set_opt(sbi->s_mount_opt, ERRORS_PANIC); 1225 break; 1226 case Opt_err_ro: 1227 clear_opt(sbi->s_mount_opt, ERRORS_CONT); 1228 clear_opt(sbi->s_mount_opt, ERRORS_PANIC); 1229 set_opt(sbi->s_mount_opt, ERRORS_RO); 1230 break; 1231 case Opt_err_cont: 1232 clear_opt(sbi->s_mount_opt, ERRORS_RO); 1233 clear_opt(sbi->s_mount_opt, ERRORS_PANIC); 1234 set_opt(sbi->s_mount_opt, ERRORS_CONT); 1235 break; 1236 case Opt_nouid32: 1237 set_opt(sbi->s_mount_opt, NO_UID32); 1238 break; 1239 case Opt_debug: 1240 set_opt(sbi->s_mount_opt, DEBUG); 1241 break; 1242 case Opt_oldalloc: 1243 set_opt(sbi->s_mount_opt, OLDALLOC); 1244 break; 1245 case Opt_orlov: 1246 clear_opt(sbi->s_mount_opt, OLDALLOC); 1247 break; 1248 #ifdef CONFIG_EXT4_FS_XATTR 1249 case Opt_user_xattr: 1250 set_opt(sbi->s_mount_opt, XATTR_USER); 1251 break; 1252 case Opt_nouser_xattr: 1253 clear_opt(sbi->s_mount_opt, XATTR_USER); 1254 break; 1255 #else 1256 case Opt_user_xattr: 1257 case Opt_nouser_xattr: 1258 ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported"); 1259 break; 1260 #endif 1261 #ifdef CONFIG_EXT4_FS_POSIX_ACL 1262 case Opt_acl: 1263 set_opt(sbi->s_mount_opt, POSIX_ACL); 1264 break; 1265 case Opt_noacl: 1266 clear_opt(sbi->s_mount_opt, POSIX_ACL); 1267 break; 1268 #else 1269 case Opt_acl: 1270 case Opt_noacl: 1271 ext4_msg(sb, KERN_ERR, "(no)acl options not supported"); 1272 break; 1273 #endif 1274 case Opt_journal_update: 1275 /* @@@ FIXME */ 1276 /* Eventually we will want to be able to create 1277 a journal file here. For now, only allow the 1278 user to specify an existing inode to be the 1279 journal file. */ 1280 if (is_remount) { 1281 ext4_msg(sb, KERN_ERR, 1282 "Cannot specify journal on remount"); 1283 return 0; 1284 } 1285 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL); 1286 break; 1287 case Opt_journal_dev: 1288 if (is_remount) { 1289 ext4_msg(sb, KERN_ERR, 1290 "Cannot specify journal on remount"); 1291 return 0; 1292 } 1293 if (match_int(&args[0], &option)) 1294 return 0; 1295 *journal_devnum = option; 1296 break; 1297 case Opt_journal_checksum: 1298 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); 1299 break; 1300 case Opt_journal_async_commit: 1301 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT); 1302 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); 1303 break; 1304 case Opt_noload: 1305 set_opt(sbi->s_mount_opt, NOLOAD); 1306 break; 1307 case Opt_commit: 1308 if (match_int(&args[0], &option)) 1309 return 0; 1310 if (option < 0) 1311 return 0; 1312 if (option == 0) 1313 option = JBD2_DEFAULT_MAX_COMMIT_AGE; 1314 sbi->s_commit_interval = HZ * option; 1315 break; 1316 case Opt_max_batch_time: 1317 if (match_int(&args[0], &option)) 1318 return 0; 1319 if (option < 0) 1320 return 0; 1321 if (option == 0) 1322 option = EXT4_DEF_MAX_BATCH_TIME; 1323 sbi->s_max_batch_time = option; 1324 break; 1325 case Opt_min_batch_time: 1326 if (match_int(&args[0], &option)) 1327 return 0; 1328 if (option < 0) 1329 return 0; 1330 sbi->s_min_batch_time = option; 1331 break; 1332 case Opt_data_journal: 1333 data_opt = EXT4_MOUNT_JOURNAL_DATA; 1334 goto datacheck; 1335 case Opt_data_ordered: 1336 data_opt = EXT4_MOUNT_ORDERED_DATA; 1337 goto datacheck; 1338 case Opt_data_writeback: 1339 data_opt = EXT4_MOUNT_WRITEBACK_DATA; 1340 datacheck: 1341 if (is_remount) { 1342 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS) 1343 != data_opt) { 1344 ext4_msg(sb, KERN_ERR, 1345 "Cannot change data mode on remount"); 1346 return 0; 1347 } 1348 } else { 1349 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS; 1350 sbi->s_mount_opt |= data_opt; 1351 } 1352 break; 1353 case Opt_data_err_abort: 1354 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT); 1355 break; 1356 case Opt_data_err_ignore: 1357 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT); 1358 break; 1359 case Opt_mb_history_length: 1360 if (match_int(&args[0], &option)) 1361 return 0; 1362 if (option < 0) 1363 return 0; 1364 sbi->s_mb_history_max = option; 1365 break; 1366 #ifdef CONFIG_QUOTA 1367 case Opt_usrjquota: 1368 qtype = USRQUOTA; 1369 goto set_qf_name; 1370 case Opt_grpjquota: 1371 qtype = GRPQUOTA; 1372 set_qf_name: 1373 if (sb_any_quota_loaded(sb) && 1374 !sbi->s_qf_names[qtype]) { 1375 ext4_msg(sb, KERN_ERR, 1376 "Cannot change journaled " 1377 "quota options when quota turned on"); 1378 return 0; 1379 } 1380 qname = match_strdup(&args[0]); 1381 if (!qname) { 1382 ext4_msg(sb, KERN_ERR, 1383 "Not enough memory for " 1384 "storing quotafile name"); 1385 return 0; 1386 } 1387 if (sbi->s_qf_names[qtype] && 1388 strcmp(sbi->s_qf_names[qtype], qname)) { 1389 ext4_msg(sb, KERN_ERR, 1390 "%s quota file already " 1391 "specified", QTYPE2NAME(qtype)); 1392 kfree(qname); 1393 return 0; 1394 } 1395 sbi->s_qf_names[qtype] = qname; 1396 if (strchr(sbi->s_qf_names[qtype], '/')) { 1397 ext4_msg(sb, KERN_ERR, 1398 "quotafile must be on " 1399 "filesystem root"); 1400 kfree(sbi->s_qf_names[qtype]); 1401 sbi->s_qf_names[qtype] = NULL; 1402 return 0; 1403 } 1404 set_opt(sbi->s_mount_opt, QUOTA); 1405 break; 1406 case Opt_offusrjquota: 1407 qtype = USRQUOTA; 1408 goto clear_qf_name; 1409 case Opt_offgrpjquota: 1410 qtype = GRPQUOTA; 1411 clear_qf_name: 1412 if (sb_any_quota_loaded(sb) && 1413 sbi->s_qf_names[qtype]) { 1414 ext4_msg(sb, KERN_ERR, "Cannot change " 1415 "journaled quota options when " 1416 "quota turned on"); 1417 return 0; 1418 } 1419 /* 1420 * The space will be released later when all options 1421 * are confirmed to be correct 1422 */ 1423 sbi->s_qf_names[qtype] = NULL; 1424 break; 1425 case Opt_jqfmt_vfsold: 1426 qfmt = QFMT_VFS_OLD; 1427 goto set_qf_format; 1428 case Opt_jqfmt_vfsv0: 1429 qfmt = QFMT_VFS_V0; 1430 set_qf_format: 1431 if (sb_any_quota_loaded(sb) && 1432 sbi->s_jquota_fmt != qfmt) { 1433 ext4_msg(sb, KERN_ERR, "Cannot change " 1434 "journaled quota options when " 1435 "quota turned on"); 1436 return 0; 1437 } 1438 sbi->s_jquota_fmt = qfmt; 1439 break; 1440 case Opt_quota: 1441 case Opt_usrquota: 1442 set_opt(sbi->s_mount_opt, QUOTA); 1443 set_opt(sbi->s_mount_opt, USRQUOTA); 1444 break; 1445 case Opt_grpquota: 1446 set_opt(sbi->s_mount_opt, QUOTA); 1447 set_opt(sbi->s_mount_opt, GRPQUOTA); 1448 break; 1449 case Opt_noquota: 1450 if (sb_any_quota_loaded(sb)) { 1451 ext4_msg(sb, KERN_ERR, "Cannot change quota " 1452 "options when quota turned on"); 1453 return 0; 1454 } 1455 clear_opt(sbi->s_mount_opt, QUOTA); 1456 clear_opt(sbi->s_mount_opt, USRQUOTA); 1457 clear_opt(sbi->s_mount_opt, GRPQUOTA); 1458 break; 1459 #else 1460 case Opt_quota: 1461 case Opt_usrquota: 1462 case Opt_grpquota: 1463 ext4_msg(sb, KERN_ERR, 1464 "quota options not supported"); 1465 break; 1466 case Opt_usrjquota: 1467 case Opt_grpjquota: 1468 case Opt_offusrjquota: 1469 case Opt_offgrpjquota: 1470 case Opt_jqfmt_vfsold: 1471 case Opt_jqfmt_vfsv0: 1472 ext4_msg(sb, KERN_ERR, 1473 "journaled quota options not supported"); 1474 break; 1475 case Opt_noquota: 1476 break; 1477 #endif 1478 case Opt_abort: 1479 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED; 1480 break; 1481 case Opt_nobarrier: 1482 clear_opt(sbi->s_mount_opt, BARRIER); 1483 break; 1484 case Opt_barrier: 1485 if (match_int(&args[0], &option)) { 1486 set_opt(sbi->s_mount_opt, BARRIER); 1487 break; 1488 } 1489 if (option) 1490 set_opt(sbi->s_mount_opt, BARRIER); 1491 else 1492 clear_opt(sbi->s_mount_opt, BARRIER); 1493 break; 1494 case Opt_ignore: 1495 break; 1496 case Opt_resize: 1497 if (!is_remount) { 1498 ext4_msg(sb, KERN_ERR, 1499 "resize option only available " 1500 "for remount"); 1501 return 0; 1502 } 1503 if (match_int(&args[0], &option) != 0) 1504 return 0; 1505 *n_blocks_count = option; 1506 break; 1507 case Opt_nobh: 1508 set_opt(sbi->s_mount_opt, NOBH); 1509 break; 1510 case Opt_bh: 1511 clear_opt(sbi->s_mount_opt, NOBH); 1512 break; 1513 case Opt_i_version: 1514 set_opt(sbi->s_mount_opt, I_VERSION); 1515 sb->s_flags |= MS_I_VERSION; 1516 break; 1517 case Opt_nodelalloc: 1518 clear_opt(sbi->s_mount_opt, DELALLOC); 1519 break; 1520 case Opt_stripe: 1521 if (match_int(&args[0], &option)) 1522 return 0; 1523 if (option < 0) 1524 return 0; 1525 sbi->s_stripe = option; 1526 break; 1527 case Opt_delalloc: 1528 set_opt(sbi->s_mount_opt, DELALLOC); 1529 break; 1530 case Opt_block_validity: 1531 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY); 1532 break; 1533 case Opt_noblock_validity: 1534 clear_opt(sbi->s_mount_opt, BLOCK_VALIDITY); 1535 break; 1536 case Opt_inode_readahead_blks: 1537 if (match_int(&args[0], &option)) 1538 return 0; 1539 if (option < 0 || option > (1 << 30)) 1540 return 0; 1541 if (!is_power_of_2(option)) { 1542 ext4_msg(sb, KERN_ERR, 1543 "EXT4-fs: inode_readahead_blks" 1544 " must be a power of 2"); 1545 return 0; 1546 } 1547 sbi->s_inode_readahead_blks = option; 1548 break; 1549 case Opt_journal_ioprio: 1550 if (match_int(&args[0], &option)) 1551 return 0; 1552 if (option < 0 || option > 7) 1553 break; 1554 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 1555 option); 1556 break; 1557 case Opt_noauto_da_alloc: 1558 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC); 1559 break; 1560 case Opt_auto_da_alloc: 1561 if (match_int(&args[0], &option)) { 1562 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC); 1563 break; 1564 } 1565 if (option) 1566 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC); 1567 else 1568 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC); 1569 break; 1570 default: 1571 ext4_msg(sb, KERN_ERR, 1572 "Unrecognized mount option \"%s\" " 1573 "or missing value", p); 1574 return 0; 1575 } 1576 } 1577 #ifdef CONFIG_QUOTA 1578 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { 1579 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) && 1580 sbi->s_qf_names[USRQUOTA]) 1581 clear_opt(sbi->s_mount_opt, USRQUOTA); 1582 1583 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) && 1584 sbi->s_qf_names[GRPQUOTA]) 1585 clear_opt(sbi->s_mount_opt, GRPQUOTA); 1586 1587 if ((sbi->s_qf_names[USRQUOTA] && 1588 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) || 1589 (sbi->s_qf_names[GRPQUOTA] && 1590 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) { 1591 ext4_msg(sb, KERN_ERR, "old and new quota " 1592 "format mixing"); 1593 return 0; 1594 } 1595 1596 if (!sbi->s_jquota_fmt) { 1597 ext4_msg(sb, KERN_ERR, "journaled quota format " 1598 "not specified"); 1599 return 0; 1600 } 1601 } else { 1602 if (sbi->s_jquota_fmt) { 1603 ext4_msg(sb, KERN_ERR, "journaled quota format " 1604 "specified with no journaling " 1605 "enabled"); 1606 return 0; 1607 } 1608 } 1609 #endif 1610 return 1; 1611 } 1612 1613 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, 1614 int read_only) 1615 { 1616 struct ext4_sb_info *sbi = EXT4_SB(sb); 1617 int res = 0; 1618 1619 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { 1620 ext4_msg(sb, KERN_ERR, "revision level too high, " 1621 "forcing read-only mode"); 1622 res = MS_RDONLY; 1623 } 1624 if (read_only) 1625 return res; 1626 if (!(sbi->s_mount_state & EXT4_VALID_FS)) 1627 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, " 1628 "running e2fsck is recommended"); 1629 else if ((sbi->s_mount_state & EXT4_ERROR_FS)) 1630 ext4_msg(sb, KERN_WARNING, 1631 "warning: mounting fs with errors, " 1632 "running e2fsck is recommended"); 1633 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 1634 le16_to_cpu(es->s_mnt_count) >= 1635 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 1636 ext4_msg(sb, KERN_WARNING, 1637 "warning: maximal mount count reached, " 1638 "running e2fsck is recommended"); 1639 else if (le32_to_cpu(es->s_checkinterval) && 1640 (le32_to_cpu(es->s_lastcheck) + 1641 le32_to_cpu(es->s_checkinterval) <= get_seconds())) 1642 ext4_msg(sb, KERN_WARNING, 1643 "warning: checktime reached, " 1644 "running e2fsck is recommended"); 1645 if (!sbi->s_journal) 1646 es->s_state &= cpu_to_le16(~EXT4_VALID_FS); 1647 if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) 1648 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); 1649 le16_add_cpu(&es->s_mnt_count, 1); 1650 es->s_mtime = cpu_to_le32(get_seconds()); 1651 ext4_update_dynamic_rev(sb); 1652 if (sbi->s_journal) 1653 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 1654 1655 ext4_commit_super(sb, 1); 1656 if (test_opt(sb, DEBUG)) 1657 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, " 1658 "bpg=%lu, ipg=%lu, mo=%04x]\n", 1659 sb->s_blocksize, 1660 sbi->s_groups_count, 1661 EXT4_BLOCKS_PER_GROUP(sb), 1662 EXT4_INODES_PER_GROUP(sb), 1663 sbi->s_mount_opt); 1664 1665 if (EXT4_SB(sb)->s_journal) { 1666 ext4_msg(sb, KERN_INFO, "%s journal on %s", 1667 EXT4_SB(sb)->s_journal->j_inode ? "internal" : 1668 "external", EXT4_SB(sb)->s_journal->j_devname); 1669 } else { 1670 ext4_msg(sb, KERN_INFO, "no journal"); 1671 } 1672 return res; 1673 } 1674 1675 static int ext4_fill_flex_info(struct super_block *sb) 1676 { 1677 struct ext4_sb_info *sbi = EXT4_SB(sb); 1678 struct ext4_group_desc *gdp = NULL; 1679 ext4_group_t flex_group_count; 1680 ext4_group_t flex_group; 1681 int groups_per_flex = 0; 1682 size_t size; 1683 int i; 1684 1685 if (!sbi->s_es->s_log_groups_per_flex) { 1686 sbi->s_log_groups_per_flex = 0; 1687 return 1; 1688 } 1689 1690 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex; 1691 groups_per_flex = 1 << sbi->s_log_groups_per_flex; 1692 1693 /* We allocate both existing and potentially added groups */ 1694 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) + 1695 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) << 1696 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex; 1697 size = flex_group_count * sizeof(struct flex_groups); 1698 sbi->s_flex_groups = kzalloc(size, GFP_KERNEL); 1699 if (sbi->s_flex_groups == NULL) { 1700 sbi->s_flex_groups = vmalloc(size); 1701 if (sbi->s_flex_groups) 1702 memset(sbi->s_flex_groups, 0, size); 1703 } 1704 if (sbi->s_flex_groups == NULL) { 1705 ext4_msg(sb, KERN_ERR, "not enough memory for " 1706 "%u flex groups", flex_group_count); 1707 goto failed; 1708 } 1709 1710 for (i = 0; i < sbi->s_groups_count; i++) { 1711 gdp = ext4_get_group_desc(sb, i, NULL); 1712 1713 flex_group = ext4_flex_group(sbi, i); 1714 atomic_set(&sbi->s_flex_groups[flex_group].free_inodes, 1715 ext4_free_inodes_count(sb, gdp)); 1716 atomic_set(&sbi->s_flex_groups[flex_group].free_blocks, 1717 ext4_free_blks_count(sb, gdp)); 1718 atomic_set(&sbi->s_flex_groups[flex_group].used_dirs, 1719 ext4_used_dirs_count(sb, gdp)); 1720 } 1721 1722 return 1; 1723 failed: 1724 return 0; 1725 } 1726 1727 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group, 1728 struct ext4_group_desc *gdp) 1729 { 1730 __u16 crc = 0; 1731 1732 if (sbi->s_es->s_feature_ro_compat & 1733 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { 1734 int offset = offsetof(struct ext4_group_desc, bg_checksum); 1735 __le32 le_group = cpu_to_le32(block_group); 1736 1737 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); 1738 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); 1739 crc = crc16(crc, (__u8 *)gdp, offset); 1740 offset += sizeof(gdp->bg_checksum); /* skip checksum */ 1741 /* for checksum of struct ext4_group_desc do the rest...*/ 1742 if ((sbi->s_es->s_feature_incompat & 1743 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) && 1744 offset < le16_to_cpu(sbi->s_es->s_desc_size)) 1745 crc = crc16(crc, (__u8 *)gdp + offset, 1746 le16_to_cpu(sbi->s_es->s_desc_size) - 1747 offset); 1748 } 1749 1750 return cpu_to_le16(crc); 1751 } 1752 1753 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group, 1754 struct ext4_group_desc *gdp) 1755 { 1756 if ((sbi->s_es->s_feature_ro_compat & 1757 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) && 1758 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp))) 1759 return 0; 1760 1761 return 1; 1762 } 1763 1764 /* Called at mount-time, super-block is locked */ 1765 static int ext4_check_descriptors(struct super_block *sb) 1766 { 1767 struct ext4_sb_info *sbi = EXT4_SB(sb); 1768 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); 1769 ext4_fsblk_t last_block; 1770 ext4_fsblk_t block_bitmap; 1771 ext4_fsblk_t inode_bitmap; 1772 ext4_fsblk_t inode_table; 1773 int flexbg_flag = 0; 1774 ext4_group_t i; 1775 1776 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 1777 flexbg_flag = 1; 1778 1779 ext4_debug("Checking group descriptors"); 1780 1781 for (i = 0; i < sbi->s_groups_count; i++) { 1782 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); 1783 1784 if (i == sbi->s_groups_count - 1 || flexbg_flag) 1785 last_block = ext4_blocks_count(sbi->s_es) - 1; 1786 else 1787 last_block = first_block + 1788 (EXT4_BLOCKS_PER_GROUP(sb) - 1); 1789 1790 block_bitmap = ext4_block_bitmap(sb, gdp); 1791 if (block_bitmap < first_block || block_bitmap > last_block) { 1792 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 1793 "Block bitmap for group %u not in group " 1794 "(block %llu)!", i, block_bitmap); 1795 return 0; 1796 } 1797 inode_bitmap = ext4_inode_bitmap(sb, gdp); 1798 if (inode_bitmap < first_block || inode_bitmap > last_block) { 1799 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 1800 "Inode bitmap for group %u not in group " 1801 "(block %llu)!", i, inode_bitmap); 1802 return 0; 1803 } 1804 inode_table = ext4_inode_table(sb, gdp); 1805 if (inode_table < first_block || 1806 inode_table + sbi->s_itb_per_group - 1 > last_block) { 1807 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 1808 "Inode table for group %u not in group " 1809 "(block %llu)!", i, inode_table); 1810 return 0; 1811 } 1812 ext4_lock_group(sb, i); 1813 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) { 1814 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " 1815 "Checksum for group %u failed (%u!=%u)", 1816 i, le16_to_cpu(ext4_group_desc_csum(sbi, i, 1817 gdp)), le16_to_cpu(gdp->bg_checksum)); 1818 if (!(sb->s_flags & MS_RDONLY)) { 1819 ext4_unlock_group(sb, i); 1820 return 0; 1821 } 1822 } 1823 ext4_unlock_group(sb, i); 1824 if (!flexbg_flag) 1825 first_block += EXT4_BLOCKS_PER_GROUP(sb); 1826 } 1827 1828 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb)); 1829 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb)); 1830 return 1; 1831 } 1832 1833 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at 1834 * the superblock) which were deleted from all directories, but held open by 1835 * a process at the time of a crash. We walk the list and try to delete these 1836 * inodes at recovery time (only with a read-write filesystem). 1837 * 1838 * In order to keep the orphan inode chain consistent during traversal (in 1839 * case of crash during recovery), we link each inode into the superblock 1840 * orphan list_head and handle it the same way as an inode deletion during 1841 * normal operation (which journals the operations for us). 1842 * 1843 * We only do an iget() and an iput() on each inode, which is very safe if we 1844 * accidentally point at an in-use or already deleted inode. The worst that 1845 * can happen in this case is that we get a "bit already cleared" message from 1846 * ext4_free_inode(). The only reason we would point at a wrong inode is if 1847 * e2fsck was run on this filesystem, and it must have already done the orphan 1848 * inode cleanup for us, so we can safely abort without any further action. 1849 */ 1850 static void ext4_orphan_cleanup(struct super_block *sb, 1851 struct ext4_super_block *es) 1852 { 1853 unsigned int s_flags = sb->s_flags; 1854 int nr_orphans = 0, nr_truncates = 0; 1855 #ifdef CONFIG_QUOTA 1856 int i; 1857 #endif 1858 if (!es->s_last_orphan) { 1859 jbd_debug(4, "no orphan inodes to clean up\n"); 1860 return; 1861 } 1862 1863 if (bdev_read_only(sb->s_bdev)) { 1864 ext4_msg(sb, KERN_ERR, "write access " 1865 "unavailable, skipping orphan cleanup"); 1866 return; 1867 } 1868 1869 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { 1870 if (es->s_last_orphan) 1871 jbd_debug(1, "Errors on filesystem, " 1872 "clearing orphan list.\n"); 1873 es->s_last_orphan = 0; 1874 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); 1875 return; 1876 } 1877 1878 if (s_flags & MS_RDONLY) { 1879 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs"); 1880 sb->s_flags &= ~MS_RDONLY; 1881 } 1882 #ifdef CONFIG_QUOTA 1883 /* Needed for iput() to work correctly and not trash data */ 1884 sb->s_flags |= MS_ACTIVE; 1885 /* Turn on quotas so that they are updated correctly */ 1886 for (i = 0; i < MAXQUOTAS; i++) { 1887 if (EXT4_SB(sb)->s_qf_names[i]) { 1888 int ret = ext4_quota_on_mount(sb, i); 1889 if (ret < 0) 1890 ext4_msg(sb, KERN_ERR, 1891 "Cannot turn on journaled " 1892 "quota: error %d", ret); 1893 } 1894 } 1895 #endif 1896 1897 while (es->s_last_orphan) { 1898 struct inode *inode; 1899 1900 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); 1901 if (IS_ERR(inode)) { 1902 es->s_last_orphan = 0; 1903 break; 1904 } 1905 1906 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); 1907 vfs_dq_init(inode); 1908 if (inode->i_nlink) { 1909 ext4_msg(sb, KERN_DEBUG, 1910 "%s: truncating inode %lu to %lld bytes", 1911 __func__, inode->i_ino, inode->i_size); 1912 jbd_debug(2, "truncating inode %lu to %lld bytes\n", 1913 inode->i_ino, inode->i_size); 1914 ext4_truncate(inode); 1915 nr_truncates++; 1916 } else { 1917 ext4_msg(sb, KERN_DEBUG, 1918 "%s: deleting unreferenced inode %lu", 1919 __func__, inode->i_ino); 1920 jbd_debug(2, "deleting unreferenced inode %lu\n", 1921 inode->i_ino); 1922 nr_orphans++; 1923 } 1924 iput(inode); /* The delete magic happens here! */ 1925 } 1926 1927 #define PLURAL(x) (x), ((x) == 1) ? "" : "s" 1928 1929 if (nr_orphans) 1930 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted", 1931 PLURAL(nr_orphans)); 1932 if (nr_truncates) 1933 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up", 1934 PLURAL(nr_truncates)); 1935 #ifdef CONFIG_QUOTA 1936 /* Turn quotas off */ 1937 for (i = 0; i < MAXQUOTAS; i++) { 1938 if (sb_dqopt(sb)->files[i]) 1939 vfs_quota_off(sb, i, 0); 1940 } 1941 #endif 1942 sb->s_flags = s_flags; /* Restore MS_RDONLY status */ 1943 } 1944 1945 /* 1946 * Maximal extent format file size. 1947 * Resulting logical blkno at s_maxbytes must fit in our on-disk 1948 * extent format containers, within a sector_t, and within i_blocks 1949 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, 1950 * so that won't be a limiting factor. 1951 * 1952 * Note, this does *not* consider any metadata overhead for vfs i_blocks. 1953 */ 1954 static loff_t ext4_max_size(int blkbits, int has_huge_files) 1955 { 1956 loff_t res; 1957 loff_t upper_limit = MAX_LFS_FILESIZE; 1958 1959 /* small i_blocks in vfs inode? */ 1960 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { 1961 /* 1962 * CONFIG_LBDAF is not enabled implies the inode 1963 * i_block represent total blocks in 512 bytes 1964 * 32 == size of vfs inode i_blocks * 8 1965 */ 1966 upper_limit = (1LL << 32) - 1; 1967 1968 /* total blocks in file system block size */ 1969 upper_limit >>= (blkbits - 9); 1970 upper_limit <<= blkbits; 1971 } 1972 1973 /* 32-bit extent-start container, ee_block */ 1974 res = 1LL << 32; 1975 res <<= blkbits; 1976 res -= 1; 1977 1978 /* Sanity check against vm- & vfs- imposed limits */ 1979 if (res > upper_limit) 1980 res = upper_limit; 1981 1982 return res; 1983 } 1984 1985 /* 1986 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect 1987 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. 1988 * We need to be 1 filesystem block less than the 2^48 sector limit. 1989 */ 1990 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files) 1991 { 1992 loff_t res = EXT4_NDIR_BLOCKS; 1993 int meta_blocks; 1994 loff_t upper_limit; 1995 /* This is calculated to be the largest file size for a dense, block 1996 * mapped file such that the file's total number of 512-byte sectors, 1997 * including data and all indirect blocks, does not exceed (2^48 - 1). 1998 * 1999 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total 2000 * number of 512-byte sectors of the file. 2001 */ 2002 2003 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { 2004 /* 2005 * !has_huge_files or CONFIG_LBDAF not enabled implies that 2006 * the inode i_block field represents total file blocks in 2007 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8 2008 */ 2009 upper_limit = (1LL << 32) - 1; 2010 2011 /* total blocks in file system block size */ 2012 upper_limit >>= (bits - 9); 2013 2014 } else { 2015 /* 2016 * We use 48 bit ext4_inode i_blocks 2017 * With EXT4_HUGE_FILE_FL set the i_blocks 2018 * represent total number of blocks in 2019 * file system block size 2020 */ 2021 upper_limit = (1LL << 48) - 1; 2022 2023 } 2024 2025 /* indirect blocks */ 2026 meta_blocks = 1; 2027 /* double indirect blocks */ 2028 meta_blocks += 1 + (1LL << (bits-2)); 2029 /* tripple indirect blocks */ 2030 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); 2031 2032 upper_limit -= meta_blocks; 2033 upper_limit <<= bits; 2034 2035 res += 1LL << (bits-2); 2036 res += 1LL << (2*(bits-2)); 2037 res += 1LL << (3*(bits-2)); 2038 res <<= bits; 2039 if (res > upper_limit) 2040 res = upper_limit; 2041 2042 if (res > MAX_LFS_FILESIZE) 2043 res = MAX_LFS_FILESIZE; 2044 2045 return res; 2046 } 2047 2048 static ext4_fsblk_t descriptor_loc(struct super_block *sb, 2049 ext4_fsblk_t logical_sb_block, int nr) 2050 { 2051 struct ext4_sb_info *sbi = EXT4_SB(sb); 2052 ext4_group_t bg, first_meta_bg; 2053 int has_super = 0; 2054 2055 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 2056 2057 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || 2058 nr < first_meta_bg) 2059 return logical_sb_block + nr + 1; 2060 bg = sbi->s_desc_per_block * nr; 2061 if (ext4_bg_has_super(sb, bg)) 2062 has_super = 1; 2063 2064 return (has_super + ext4_group_first_block_no(sb, bg)); 2065 } 2066 2067 /** 2068 * ext4_get_stripe_size: Get the stripe size. 2069 * @sbi: In memory super block info 2070 * 2071 * If we have specified it via mount option, then 2072 * use the mount option value. If the value specified at mount time is 2073 * greater than the blocks per group use the super block value. 2074 * If the super block value is greater than blocks per group return 0. 2075 * Allocator needs it be less than blocks per group. 2076 * 2077 */ 2078 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) 2079 { 2080 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); 2081 unsigned long stripe_width = 2082 le32_to_cpu(sbi->s_es->s_raid_stripe_width); 2083 2084 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) 2085 return sbi->s_stripe; 2086 2087 if (stripe_width <= sbi->s_blocks_per_group) 2088 return stripe_width; 2089 2090 if (stride <= sbi->s_blocks_per_group) 2091 return stride; 2092 2093 return 0; 2094 } 2095 2096 /* sysfs supprt */ 2097 2098 struct ext4_attr { 2099 struct attribute attr; 2100 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *); 2101 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *, 2102 const char *, size_t); 2103 int offset; 2104 }; 2105 2106 static int parse_strtoul(const char *buf, 2107 unsigned long max, unsigned long *value) 2108 { 2109 char *endp; 2110 2111 while (*buf && isspace(*buf)) 2112 buf++; 2113 *value = simple_strtoul(buf, &endp, 0); 2114 while (*endp && isspace(*endp)) 2115 endp++; 2116 if (*endp || *value > max) 2117 return -EINVAL; 2118 2119 return 0; 2120 } 2121 2122 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a, 2123 struct ext4_sb_info *sbi, 2124 char *buf) 2125 { 2126 return snprintf(buf, PAGE_SIZE, "%llu\n", 2127 (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter)); 2128 } 2129 2130 static ssize_t session_write_kbytes_show(struct ext4_attr *a, 2131 struct ext4_sb_info *sbi, char *buf) 2132 { 2133 struct super_block *sb = sbi->s_buddy_cache->i_sb; 2134 2135 return snprintf(buf, PAGE_SIZE, "%lu\n", 2136 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 2137 sbi->s_sectors_written_start) >> 1); 2138 } 2139 2140 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a, 2141 struct ext4_sb_info *sbi, char *buf) 2142 { 2143 struct super_block *sb = sbi->s_buddy_cache->i_sb; 2144 2145 return snprintf(buf, PAGE_SIZE, "%llu\n", 2146 sbi->s_kbytes_written + 2147 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 2148 EXT4_SB(sb)->s_sectors_written_start) >> 1)); 2149 } 2150 2151 static ssize_t inode_readahead_blks_store(struct ext4_attr *a, 2152 struct ext4_sb_info *sbi, 2153 const char *buf, size_t count) 2154 { 2155 unsigned long t; 2156 2157 if (parse_strtoul(buf, 0x40000000, &t)) 2158 return -EINVAL; 2159 2160 if (!is_power_of_2(t)) 2161 return -EINVAL; 2162 2163 sbi->s_inode_readahead_blks = t; 2164 return count; 2165 } 2166 2167 static ssize_t sbi_ui_show(struct ext4_attr *a, 2168 struct ext4_sb_info *sbi, char *buf) 2169 { 2170 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset); 2171 2172 return snprintf(buf, PAGE_SIZE, "%u\n", *ui); 2173 } 2174 2175 static ssize_t sbi_ui_store(struct ext4_attr *a, 2176 struct ext4_sb_info *sbi, 2177 const char *buf, size_t count) 2178 { 2179 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset); 2180 unsigned long t; 2181 2182 if (parse_strtoul(buf, 0xffffffff, &t)) 2183 return -EINVAL; 2184 *ui = t; 2185 return count; 2186 } 2187 2188 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \ 2189 static struct ext4_attr ext4_attr_##_name = { \ 2190 .attr = {.name = __stringify(_name), .mode = _mode }, \ 2191 .show = _show, \ 2192 .store = _store, \ 2193 .offset = offsetof(struct ext4_sb_info, _elname), \ 2194 } 2195 #define EXT4_ATTR(name, mode, show, store) \ 2196 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store) 2197 2198 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL) 2199 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store) 2200 #define EXT4_RW_ATTR_SBI_UI(name, elname) \ 2201 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname) 2202 #define ATTR_LIST(name) &ext4_attr_##name.attr 2203 2204 EXT4_RO_ATTR(delayed_allocation_blocks); 2205 EXT4_RO_ATTR(session_write_kbytes); 2206 EXT4_RO_ATTR(lifetime_write_kbytes); 2207 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show, 2208 inode_readahead_blks_store, s_inode_readahead_blks); 2209 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal); 2210 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats); 2211 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan); 2212 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan); 2213 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs); 2214 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request); 2215 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc); 2216 2217 static struct attribute *ext4_attrs[] = { 2218 ATTR_LIST(delayed_allocation_blocks), 2219 ATTR_LIST(session_write_kbytes), 2220 ATTR_LIST(lifetime_write_kbytes), 2221 ATTR_LIST(inode_readahead_blks), 2222 ATTR_LIST(inode_goal), 2223 ATTR_LIST(mb_stats), 2224 ATTR_LIST(mb_max_to_scan), 2225 ATTR_LIST(mb_min_to_scan), 2226 ATTR_LIST(mb_order2_req), 2227 ATTR_LIST(mb_stream_req), 2228 ATTR_LIST(mb_group_prealloc), 2229 NULL, 2230 }; 2231 2232 static ssize_t ext4_attr_show(struct kobject *kobj, 2233 struct attribute *attr, char *buf) 2234 { 2235 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 2236 s_kobj); 2237 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); 2238 2239 return a->show ? a->show(a, sbi, buf) : 0; 2240 } 2241 2242 static ssize_t ext4_attr_store(struct kobject *kobj, 2243 struct attribute *attr, 2244 const char *buf, size_t len) 2245 { 2246 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 2247 s_kobj); 2248 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); 2249 2250 return a->store ? a->store(a, sbi, buf, len) : 0; 2251 } 2252 2253 static void ext4_sb_release(struct kobject *kobj) 2254 { 2255 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, 2256 s_kobj); 2257 complete(&sbi->s_kobj_unregister); 2258 } 2259 2260 2261 static struct sysfs_ops ext4_attr_ops = { 2262 .show = ext4_attr_show, 2263 .store = ext4_attr_store, 2264 }; 2265 2266 static struct kobj_type ext4_ktype = { 2267 .default_attrs = ext4_attrs, 2268 .sysfs_ops = &ext4_attr_ops, 2269 .release = ext4_sb_release, 2270 }; 2271 2272 static int ext4_fill_super(struct super_block *sb, void *data, int silent) 2273 __releases(kernel_lock) 2274 __acquires(kernel_lock) 2275 { 2276 struct buffer_head *bh; 2277 struct ext4_super_block *es = NULL; 2278 struct ext4_sb_info *sbi; 2279 ext4_fsblk_t block; 2280 ext4_fsblk_t sb_block = get_sb_block(&data); 2281 ext4_fsblk_t logical_sb_block; 2282 unsigned long offset = 0; 2283 unsigned long journal_devnum = 0; 2284 unsigned long def_mount_opts; 2285 struct inode *root; 2286 char *cp; 2287 const char *descr; 2288 int ret = -EINVAL; 2289 int blocksize; 2290 unsigned int db_count; 2291 unsigned int i; 2292 int needs_recovery, has_huge_files; 2293 int features; 2294 __u64 blocks_count; 2295 int err; 2296 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; 2297 2298 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 2299 if (!sbi) 2300 return -ENOMEM; 2301 2302 sbi->s_blockgroup_lock = 2303 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); 2304 if (!sbi->s_blockgroup_lock) { 2305 kfree(sbi); 2306 return -ENOMEM; 2307 } 2308 sb->s_fs_info = sbi; 2309 sbi->s_mount_opt = 0; 2310 sbi->s_resuid = EXT4_DEF_RESUID; 2311 sbi->s_resgid = EXT4_DEF_RESGID; 2312 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS; 2313 sbi->s_sb_block = sb_block; 2314 sbi->s_sectors_written_start = part_stat_read(sb->s_bdev->bd_part, 2315 sectors[1]); 2316 2317 unlock_kernel(); 2318 2319 /* Cleanup superblock name */ 2320 for (cp = sb->s_id; (cp = strchr(cp, '/'));) 2321 *cp = '!'; 2322 2323 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); 2324 if (!blocksize) { 2325 ext4_msg(sb, KERN_ERR, "unable to set blocksize"); 2326 goto out_fail; 2327 } 2328 2329 /* 2330 * The ext4 superblock will not be buffer aligned for other than 1kB 2331 * block sizes. We need to calculate the offset from buffer start. 2332 */ 2333 if (blocksize != EXT4_MIN_BLOCK_SIZE) { 2334 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 2335 offset = do_div(logical_sb_block, blocksize); 2336 } else { 2337 logical_sb_block = sb_block; 2338 } 2339 2340 if (!(bh = sb_bread(sb, logical_sb_block))) { 2341 ext4_msg(sb, KERN_ERR, "unable to read superblock"); 2342 goto out_fail; 2343 } 2344 /* 2345 * Note: s_es must be initialized as soon as possible because 2346 * some ext4 macro-instructions depend on its value 2347 */ 2348 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 2349 sbi->s_es = es; 2350 sb->s_magic = le16_to_cpu(es->s_magic); 2351 if (sb->s_magic != EXT4_SUPER_MAGIC) 2352 goto cantfind_ext4; 2353 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written); 2354 2355 /* Set defaults before we parse the mount options */ 2356 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 2357 if (def_mount_opts & EXT4_DEFM_DEBUG) 2358 set_opt(sbi->s_mount_opt, DEBUG); 2359 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) 2360 set_opt(sbi->s_mount_opt, GRPID); 2361 if (def_mount_opts & EXT4_DEFM_UID16) 2362 set_opt(sbi->s_mount_opt, NO_UID32); 2363 #ifdef CONFIG_EXT4_FS_XATTR 2364 if (def_mount_opts & EXT4_DEFM_XATTR_USER) 2365 set_opt(sbi->s_mount_opt, XATTR_USER); 2366 #endif 2367 #ifdef CONFIG_EXT4_FS_POSIX_ACL 2368 if (def_mount_opts & EXT4_DEFM_ACL) 2369 set_opt(sbi->s_mount_opt, POSIX_ACL); 2370 #endif 2371 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) 2372 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA; 2373 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) 2374 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA; 2375 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) 2376 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA; 2377 2378 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) 2379 set_opt(sbi->s_mount_opt, ERRORS_PANIC); 2380 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE) 2381 set_opt(sbi->s_mount_opt, ERRORS_CONT); 2382 else 2383 set_opt(sbi->s_mount_opt, ERRORS_RO); 2384 2385 sbi->s_resuid = le16_to_cpu(es->s_def_resuid); 2386 sbi->s_resgid = le16_to_cpu(es->s_def_resgid); 2387 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ; 2388 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME; 2389 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME; 2390 sbi->s_mb_history_max = default_mb_history_length; 2391 2392 set_opt(sbi->s_mount_opt, BARRIER); 2393 2394 /* 2395 * enable delayed allocation by default 2396 * Use -o nodelalloc to turn it off 2397 */ 2398 set_opt(sbi->s_mount_opt, DELALLOC); 2399 2400 if (!parse_options((char *) data, sb, &journal_devnum, 2401 &journal_ioprio, NULL, 0)) 2402 goto failed_mount; 2403 2404 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 2405 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 2406 2407 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && 2408 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || 2409 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 2410 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) 2411 ext4_msg(sb, KERN_WARNING, 2412 "feature flags set on rev 0 fs, " 2413 "running e2fsck is recommended"); 2414 2415 /* 2416 * Check feature flags regardless of the revision level, since we 2417 * previously didn't change the revision level when setting the flags, 2418 * so there is a chance incompat flags are set on a rev 0 filesystem. 2419 */ 2420 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP); 2421 if (features) { 2422 ext4_msg(sb, KERN_ERR, 2423 "Couldn't mount because of " 2424 "unsupported optional features (%x)", 2425 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) & 2426 ~EXT4_FEATURE_INCOMPAT_SUPP)); 2427 goto failed_mount; 2428 } 2429 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP); 2430 if (!(sb->s_flags & MS_RDONLY) && features) { 2431 ext4_msg(sb, KERN_ERR, 2432 "Couldn't mount RDWR because of " 2433 "unsupported optional features (%x)", 2434 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) & 2435 ~EXT4_FEATURE_RO_COMPAT_SUPP)); 2436 goto failed_mount; 2437 } 2438 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb, 2439 EXT4_FEATURE_RO_COMPAT_HUGE_FILE); 2440 if (has_huge_files) { 2441 /* 2442 * Large file size enabled file system can only be 2443 * mount if kernel is build with CONFIG_LBDAF 2444 */ 2445 if (sizeof(root->i_blocks) < sizeof(u64) && 2446 !(sb->s_flags & MS_RDONLY)) { 2447 ext4_msg(sb, KERN_ERR, "Filesystem with huge " 2448 "files cannot be mounted read-write " 2449 "without CONFIG_LBDAF"); 2450 goto failed_mount; 2451 } 2452 } 2453 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); 2454 2455 if (blocksize < EXT4_MIN_BLOCK_SIZE || 2456 blocksize > EXT4_MAX_BLOCK_SIZE) { 2457 ext4_msg(sb, KERN_ERR, 2458 "Unsupported filesystem blocksize %d", blocksize); 2459 goto failed_mount; 2460 } 2461 2462 if (sb->s_blocksize != blocksize) { 2463 /* Validate the filesystem blocksize */ 2464 if (!sb_set_blocksize(sb, blocksize)) { 2465 ext4_msg(sb, KERN_ERR, "bad block size %d", 2466 blocksize); 2467 goto failed_mount; 2468 } 2469 2470 brelse(bh); 2471 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 2472 offset = do_div(logical_sb_block, blocksize); 2473 bh = sb_bread(sb, logical_sb_block); 2474 if (!bh) { 2475 ext4_msg(sb, KERN_ERR, 2476 "Can't read superblock on 2nd try"); 2477 goto failed_mount; 2478 } 2479 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); 2480 sbi->s_es = es; 2481 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { 2482 ext4_msg(sb, KERN_ERR, 2483 "Magic mismatch, very weird!"); 2484 goto failed_mount; 2485 } 2486 } 2487 2488 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits, 2489 has_huge_files); 2490 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files); 2491 2492 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { 2493 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; 2494 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; 2495 } else { 2496 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 2497 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 2498 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || 2499 (!is_power_of_2(sbi->s_inode_size)) || 2500 (sbi->s_inode_size > blocksize)) { 2501 ext4_msg(sb, KERN_ERR, 2502 "unsupported inode size: %d", 2503 sbi->s_inode_size); 2504 goto failed_mount; 2505 } 2506 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) 2507 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); 2508 } 2509 2510 sbi->s_desc_size = le16_to_cpu(es->s_desc_size); 2511 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { 2512 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || 2513 sbi->s_desc_size > EXT4_MAX_DESC_SIZE || 2514 !is_power_of_2(sbi->s_desc_size)) { 2515 ext4_msg(sb, KERN_ERR, 2516 "unsupported descriptor size %lu", 2517 sbi->s_desc_size); 2518 goto failed_mount; 2519 } 2520 } else 2521 sbi->s_desc_size = EXT4_MIN_DESC_SIZE; 2522 2523 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 2524 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 2525 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0) 2526 goto cantfind_ext4; 2527 2528 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); 2529 if (sbi->s_inodes_per_block == 0) 2530 goto cantfind_ext4; 2531 sbi->s_itb_per_group = sbi->s_inodes_per_group / 2532 sbi->s_inodes_per_block; 2533 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); 2534 sbi->s_sbh = bh; 2535 sbi->s_mount_state = le16_to_cpu(es->s_state); 2536 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); 2537 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); 2538 2539 for (i = 0; i < 4; i++) 2540 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); 2541 sbi->s_def_hash_version = es->s_def_hash_version; 2542 i = le32_to_cpu(es->s_flags); 2543 if (i & EXT2_FLAGS_UNSIGNED_HASH) 2544 sbi->s_hash_unsigned = 3; 2545 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) { 2546 #ifdef __CHAR_UNSIGNED__ 2547 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH); 2548 sbi->s_hash_unsigned = 3; 2549 #else 2550 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH); 2551 #endif 2552 sb->s_dirt = 1; 2553 } 2554 2555 if (sbi->s_blocks_per_group > blocksize * 8) { 2556 ext4_msg(sb, KERN_ERR, 2557 "#blocks per group too big: %lu", 2558 sbi->s_blocks_per_group); 2559 goto failed_mount; 2560 } 2561 if (sbi->s_inodes_per_group > blocksize * 8) { 2562 ext4_msg(sb, KERN_ERR, 2563 "#inodes per group too big: %lu", 2564 sbi->s_inodes_per_group); 2565 goto failed_mount; 2566 } 2567 2568 if (ext4_blocks_count(es) > 2569 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { 2570 ext4_msg(sb, KERN_ERR, "filesystem" 2571 " too large to mount safely"); 2572 if (sizeof(sector_t) < 8) 2573 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled"); 2574 goto failed_mount; 2575 } 2576 2577 if (EXT4_BLOCKS_PER_GROUP(sb) == 0) 2578 goto cantfind_ext4; 2579 2580 /* check blocks count against device size */ 2581 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits; 2582 if (blocks_count && ext4_blocks_count(es) > blocks_count) { 2583 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu " 2584 "exceeds size of device (%llu blocks)", 2585 ext4_blocks_count(es), blocks_count); 2586 goto failed_mount; 2587 } 2588 2589 /* 2590 * It makes no sense for the first data block to be beyond the end 2591 * of the filesystem. 2592 */ 2593 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) { 2594 ext4_msg(sb, KERN_WARNING, "bad geometry: first data" 2595 "block %u is beyond end of filesystem (%llu)", 2596 le32_to_cpu(es->s_first_data_block), 2597 ext4_blocks_count(es)); 2598 goto failed_mount; 2599 } 2600 blocks_count = (ext4_blocks_count(es) - 2601 le32_to_cpu(es->s_first_data_block) + 2602 EXT4_BLOCKS_PER_GROUP(sb) - 1); 2603 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); 2604 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) { 2605 ext4_msg(sb, KERN_WARNING, "groups count too large: %u " 2606 "(block count %llu, first data block %u, " 2607 "blocks per group %lu)", sbi->s_groups_count, 2608 ext4_blocks_count(es), 2609 le32_to_cpu(es->s_first_data_block), 2610 EXT4_BLOCKS_PER_GROUP(sb)); 2611 goto failed_mount; 2612 } 2613 sbi->s_groups_count = blocks_count; 2614 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / 2615 EXT4_DESC_PER_BLOCK(sb); 2616 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *), 2617 GFP_KERNEL); 2618 if (sbi->s_group_desc == NULL) { 2619 ext4_msg(sb, KERN_ERR, "not enough memory"); 2620 goto failed_mount; 2621 } 2622 2623 #ifdef CONFIG_PROC_FS 2624 if (ext4_proc_root) 2625 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); 2626 #endif 2627 2628 bgl_lock_init(sbi->s_blockgroup_lock); 2629 2630 for (i = 0; i < db_count; i++) { 2631 block = descriptor_loc(sb, logical_sb_block, i); 2632 sbi->s_group_desc[i] = sb_bread(sb, block); 2633 if (!sbi->s_group_desc[i]) { 2634 ext4_msg(sb, KERN_ERR, 2635 "can't read group descriptor %d", i); 2636 db_count = i; 2637 goto failed_mount2; 2638 } 2639 } 2640 if (!ext4_check_descriptors(sb)) { 2641 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!"); 2642 goto failed_mount2; 2643 } 2644 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 2645 if (!ext4_fill_flex_info(sb)) { 2646 ext4_msg(sb, KERN_ERR, 2647 "unable to initialize " 2648 "flex_bg meta info!"); 2649 goto failed_mount2; 2650 } 2651 2652 sbi->s_gdb_count = db_count; 2653 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 2654 spin_lock_init(&sbi->s_next_gen_lock); 2655 2656 err = percpu_counter_init(&sbi->s_freeblocks_counter, 2657 ext4_count_free_blocks(sb)); 2658 if (!err) { 2659 err = percpu_counter_init(&sbi->s_freeinodes_counter, 2660 ext4_count_free_inodes(sb)); 2661 } 2662 if (!err) { 2663 err = percpu_counter_init(&sbi->s_dirs_counter, 2664 ext4_count_dirs(sb)); 2665 } 2666 if (!err) { 2667 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0); 2668 } 2669 if (err) { 2670 ext4_msg(sb, KERN_ERR, "insufficient memory"); 2671 goto failed_mount3; 2672 } 2673 2674 sbi->s_stripe = ext4_get_stripe_size(sbi); 2675 2676 /* 2677 * set up enough so that it can read an inode 2678 */ 2679 if (!test_opt(sb, NOLOAD) && 2680 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) 2681 sb->s_op = &ext4_sops; 2682 else 2683 sb->s_op = &ext4_nojournal_sops; 2684 sb->s_export_op = &ext4_export_ops; 2685 sb->s_xattr = ext4_xattr_handlers; 2686 #ifdef CONFIG_QUOTA 2687 sb->s_qcop = &ext4_qctl_operations; 2688 sb->dq_op = &ext4_quota_operations; 2689 #endif 2690 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ 2691 mutex_init(&sbi->s_orphan_lock); 2692 mutex_init(&sbi->s_resize_lock); 2693 2694 sb->s_root = NULL; 2695 2696 needs_recovery = (es->s_last_orphan != 0 || 2697 EXT4_HAS_INCOMPAT_FEATURE(sb, 2698 EXT4_FEATURE_INCOMPAT_RECOVER)); 2699 2700 /* 2701 * The first inode we look at is the journal inode. Don't try 2702 * root first: it may be modified in the journal! 2703 */ 2704 if (!test_opt(sb, NOLOAD) && 2705 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 2706 if (ext4_load_journal(sb, es, journal_devnum)) 2707 goto failed_mount3; 2708 if (!(sb->s_flags & MS_RDONLY) && 2709 EXT4_SB(sb)->s_journal->j_failed_commit) { 2710 ext4_msg(sb, KERN_CRIT, "error: " 2711 "ext4_fill_super: Journal transaction " 2712 "%u is corrupt", 2713 EXT4_SB(sb)->s_journal->j_failed_commit); 2714 if (test_opt(sb, ERRORS_RO)) { 2715 ext4_msg(sb, KERN_CRIT, 2716 "Mounting filesystem read-only"); 2717 sb->s_flags |= MS_RDONLY; 2718 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 2719 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 2720 } 2721 if (test_opt(sb, ERRORS_PANIC)) { 2722 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 2723 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 2724 ext4_commit_super(sb, 1); 2725 goto failed_mount4; 2726 } 2727 } 2728 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) && 2729 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 2730 ext4_msg(sb, KERN_ERR, "required journal recovery " 2731 "suppressed and not mounted read-only"); 2732 goto failed_mount4; 2733 } else { 2734 clear_opt(sbi->s_mount_opt, DATA_FLAGS); 2735 set_opt(sbi->s_mount_opt, WRITEBACK_DATA); 2736 sbi->s_journal = NULL; 2737 needs_recovery = 0; 2738 goto no_journal; 2739 } 2740 2741 if (ext4_blocks_count(es) > 0xffffffffULL && 2742 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, 2743 JBD2_FEATURE_INCOMPAT_64BIT)) { 2744 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature"); 2745 goto failed_mount4; 2746 } 2747 2748 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { 2749 jbd2_journal_set_features(sbi->s_journal, 2750 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 2751 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2752 } else if (test_opt(sb, JOURNAL_CHECKSUM)) { 2753 jbd2_journal_set_features(sbi->s_journal, 2754 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0); 2755 jbd2_journal_clear_features(sbi->s_journal, 0, 0, 2756 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2757 } else { 2758 jbd2_journal_clear_features(sbi->s_journal, 2759 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 2760 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); 2761 } 2762 2763 /* We have now updated the journal if required, so we can 2764 * validate the data journaling mode. */ 2765 switch (test_opt(sb, DATA_FLAGS)) { 2766 case 0: 2767 /* No mode set, assume a default based on the journal 2768 * capabilities: ORDERED_DATA if the journal can 2769 * cope, else JOURNAL_DATA 2770 */ 2771 if (jbd2_journal_check_available_features 2772 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) 2773 set_opt(sbi->s_mount_opt, ORDERED_DATA); 2774 else 2775 set_opt(sbi->s_mount_opt, JOURNAL_DATA); 2776 break; 2777 2778 case EXT4_MOUNT_ORDERED_DATA: 2779 case EXT4_MOUNT_WRITEBACK_DATA: 2780 if (!jbd2_journal_check_available_features 2781 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { 2782 ext4_msg(sb, KERN_ERR, "Journal does not support " 2783 "requested data journaling mode"); 2784 goto failed_mount4; 2785 } 2786 default: 2787 break; 2788 } 2789 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); 2790 2791 no_journal: 2792 2793 if (test_opt(sb, NOBH)) { 2794 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) { 2795 ext4_msg(sb, KERN_WARNING, "Ignoring nobh option - " 2796 "its supported only with writeback mode"); 2797 clear_opt(sbi->s_mount_opt, NOBH); 2798 } 2799 } 2800 /* 2801 * The jbd2_journal_load will have done any necessary log recovery, 2802 * so we can safely mount the rest of the filesystem now. 2803 */ 2804 2805 root = ext4_iget(sb, EXT4_ROOT_INO); 2806 if (IS_ERR(root)) { 2807 ext4_msg(sb, KERN_ERR, "get root inode failed"); 2808 ret = PTR_ERR(root); 2809 goto failed_mount4; 2810 } 2811 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 2812 iput(root); 2813 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck"); 2814 goto failed_mount4; 2815 } 2816 sb->s_root = d_alloc_root(root); 2817 if (!sb->s_root) { 2818 ext4_msg(sb, KERN_ERR, "get root dentry failed"); 2819 iput(root); 2820 ret = -ENOMEM; 2821 goto failed_mount4; 2822 } 2823 2824 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY); 2825 2826 /* determine the minimum size of new large inodes, if present */ 2827 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { 2828 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 2829 EXT4_GOOD_OLD_INODE_SIZE; 2830 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 2831 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { 2832 if (sbi->s_want_extra_isize < 2833 le16_to_cpu(es->s_want_extra_isize)) 2834 sbi->s_want_extra_isize = 2835 le16_to_cpu(es->s_want_extra_isize); 2836 if (sbi->s_want_extra_isize < 2837 le16_to_cpu(es->s_min_extra_isize)) 2838 sbi->s_want_extra_isize = 2839 le16_to_cpu(es->s_min_extra_isize); 2840 } 2841 } 2842 /* Check if enough inode space is available */ 2843 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > 2844 sbi->s_inode_size) { 2845 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 2846 EXT4_GOOD_OLD_INODE_SIZE; 2847 ext4_msg(sb, KERN_INFO, "required extra inode space not" 2848 "available"); 2849 } 2850 2851 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { 2852 ext4_msg(sb, KERN_WARNING, "Ignoring delalloc option - " 2853 "requested data journaling mode"); 2854 clear_opt(sbi->s_mount_opt, DELALLOC); 2855 } else if (test_opt(sb, DELALLOC)) 2856 ext4_msg(sb, KERN_INFO, "delayed allocation enabled"); 2857 2858 err = ext4_setup_system_zone(sb); 2859 if (err) { 2860 ext4_msg(sb, KERN_ERR, "failed to initialize system " 2861 "zone (%d)\n", err); 2862 goto failed_mount4; 2863 } 2864 2865 ext4_ext_init(sb); 2866 err = ext4_mb_init(sb, needs_recovery); 2867 if (err) { 2868 ext4_msg(sb, KERN_ERR, "failed to initalize mballoc (%d)", 2869 err); 2870 goto failed_mount4; 2871 } 2872 2873 sbi->s_kobj.kset = ext4_kset; 2874 init_completion(&sbi->s_kobj_unregister); 2875 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL, 2876 "%s", sb->s_id); 2877 if (err) { 2878 ext4_mb_release(sb); 2879 ext4_ext_release(sb); 2880 goto failed_mount4; 2881 }; 2882 2883 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; 2884 ext4_orphan_cleanup(sb, es); 2885 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; 2886 if (needs_recovery) { 2887 ext4_msg(sb, KERN_INFO, "recovery complete"); 2888 ext4_mark_recovery_complete(sb, es); 2889 } 2890 if (EXT4_SB(sb)->s_journal) { 2891 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 2892 descr = " journalled data mode"; 2893 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 2894 descr = " ordered data mode"; 2895 else 2896 descr = " writeback data mode"; 2897 } else 2898 descr = "out journal"; 2899 2900 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s", descr); 2901 2902 lock_kernel(); 2903 return 0; 2904 2905 cantfind_ext4: 2906 if (!silent) 2907 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem"); 2908 goto failed_mount; 2909 2910 failed_mount4: 2911 ext4_msg(sb, KERN_ERR, "mount failed"); 2912 ext4_release_system_zone(sb); 2913 if (sbi->s_journal) { 2914 jbd2_journal_destroy(sbi->s_journal); 2915 sbi->s_journal = NULL; 2916 } 2917 failed_mount3: 2918 if (sbi->s_flex_groups) { 2919 if (is_vmalloc_addr(sbi->s_flex_groups)) 2920 vfree(sbi->s_flex_groups); 2921 else 2922 kfree(sbi->s_flex_groups); 2923 } 2924 percpu_counter_destroy(&sbi->s_freeblocks_counter); 2925 percpu_counter_destroy(&sbi->s_freeinodes_counter); 2926 percpu_counter_destroy(&sbi->s_dirs_counter); 2927 percpu_counter_destroy(&sbi->s_dirtyblocks_counter); 2928 failed_mount2: 2929 for (i = 0; i < db_count; i++) 2930 brelse(sbi->s_group_desc[i]); 2931 kfree(sbi->s_group_desc); 2932 failed_mount: 2933 if (sbi->s_proc) { 2934 remove_proc_entry(sb->s_id, ext4_proc_root); 2935 } 2936 #ifdef CONFIG_QUOTA 2937 for (i = 0; i < MAXQUOTAS; i++) 2938 kfree(sbi->s_qf_names[i]); 2939 #endif 2940 ext4_blkdev_remove(sbi); 2941 brelse(bh); 2942 out_fail: 2943 sb->s_fs_info = NULL; 2944 kfree(sbi->s_blockgroup_lock); 2945 kfree(sbi); 2946 lock_kernel(); 2947 return ret; 2948 } 2949 2950 /* 2951 * Setup any per-fs journal parameters now. We'll do this both on 2952 * initial mount, once the journal has been initialised but before we've 2953 * done any recovery; and again on any subsequent remount. 2954 */ 2955 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) 2956 { 2957 struct ext4_sb_info *sbi = EXT4_SB(sb); 2958 2959 journal->j_commit_interval = sbi->s_commit_interval; 2960 journal->j_min_batch_time = sbi->s_min_batch_time; 2961 journal->j_max_batch_time = sbi->s_max_batch_time; 2962 2963 spin_lock(&journal->j_state_lock); 2964 if (test_opt(sb, BARRIER)) 2965 journal->j_flags |= JBD2_BARRIER; 2966 else 2967 journal->j_flags &= ~JBD2_BARRIER; 2968 if (test_opt(sb, DATA_ERR_ABORT)) 2969 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR; 2970 else 2971 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR; 2972 spin_unlock(&journal->j_state_lock); 2973 } 2974 2975 static journal_t *ext4_get_journal(struct super_block *sb, 2976 unsigned int journal_inum) 2977 { 2978 struct inode *journal_inode; 2979 journal_t *journal; 2980 2981 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 2982 2983 /* First, test for the existence of a valid inode on disk. Bad 2984 * things happen if we iget() an unused inode, as the subsequent 2985 * iput() will try to delete it. */ 2986 2987 journal_inode = ext4_iget(sb, journal_inum); 2988 if (IS_ERR(journal_inode)) { 2989 ext4_msg(sb, KERN_ERR, "no journal found"); 2990 return NULL; 2991 } 2992 if (!journal_inode->i_nlink) { 2993 make_bad_inode(journal_inode); 2994 iput(journal_inode); 2995 ext4_msg(sb, KERN_ERR, "journal inode is deleted"); 2996 return NULL; 2997 } 2998 2999 jbd_debug(2, "Journal inode found at %p: %lld bytes\n", 3000 journal_inode, journal_inode->i_size); 3001 if (!S_ISREG(journal_inode->i_mode)) { 3002 ext4_msg(sb, KERN_ERR, "invalid journal inode"); 3003 iput(journal_inode); 3004 return NULL; 3005 } 3006 3007 journal = jbd2_journal_init_inode(journal_inode); 3008 if (!journal) { 3009 ext4_msg(sb, KERN_ERR, "Could not load journal inode"); 3010 iput(journal_inode); 3011 return NULL; 3012 } 3013 journal->j_private = sb; 3014 ext4_init_journal_params(sb, journal); 3015 return journal; 3016 } 3017 3018 static journal_t *ext4_get_dev_journal(struct super_block *sb, 3019 dev_t j_dev) 3020 { 3021 struct buffer_head *bh; 3022 journal_t *journal; 3023 ext4_fsblk_t start; 3024 ext4_fsblk_t len; 3025 int hblock, blocksize; 3026 ext4_fsblk_t sb_block; 3027 unsigned long offset; 3028 struct ext4_super_block *es; 3029 struct block_device *bdev; 3030 3031 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 3032 3033 bdev = ext4_blkdev_get(j_dev, sb); 3034 if (bdev == NULL) 3035 return NULL; 3036 3037 if (bd_claim(bdev, sb)) { 3038 ext4_msg(sb, KERN_ERR, 3039 "failed to claim external journal device"); 3040 blkdev_put(bdev, FMODE_READ|FMODE_WRITE); 3041 return NULL; 3042 } 3043 3044 blocksize = sb->s_blocksize; 3045 hblock = bdev_logical_block_size(bdev); 3046 if (blocksize < hblock) { 3047 ext4_msg(sb, KERN_ERR, 3048 "blocksize too small for journal device"); 3049 goto out_bdev; 3050 } 3051 3052 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; 3053 offset = EXT4_MIN_BLOCK_SIZE % blocksize; 3054 set_blocksize(bdev, blocksize); 3055 if (!(bh = __bread(bdev, sb_block, blocksize))) { 3056 ext4_msg(sb, KERN_ERR, "couldn't read superblock of " 3057 "external journal"); 3058 goto out_bdev; 3059 } 3060 3061 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 3062 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || 3063 !(le32_to_cpu(es->s_feature_incompat) & 3064 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { 3065 ext4_msg(sb, KERN_ERR, "external journal has " 3066 "bad superblock"); 3067 brelse(bh); 3068 goto out_bdev; 3069 } 3070 3071 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { 3072 ext4_msg(sb, KERN_ERR, "journal UUID does not match"); 3073 brelse(bh); 3074 goto out_bdev; 3075 } 3076 3077 len = ext4_blocks_count(es); 3078 start = sb_block + 1; 3079 brelse(bh); /* we're done with the superblock */ 3080 3081 journal = jbd2_journal_init_dev(bdev, sb->s_bdev, 3082 start, len, blocksize); 3083 if (!journal) { 3084 ext4_msg(sb, KERN_ERR, "failed to create device journal"); 3085 goto out_bdev; 3086 } 3087 journal->j_private = sb; 3088 ll_rw_block(READ, 1, &journal->j_sb_buffer); 3089 wait_on_buffer(journal->j_sb_buffer); 3090 if (!buffer_uptodate(journal->j_sb_buffer)) { 3091 ext4_msg(sb, KERN_ERR, "I/O error on journal device"); 3092 goto out_journal; 3093 } 3094 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { 3095 ext4_msg(sb, KERN_ERR, "External journal has more than one " 3096 "user (unsupported) - %d", 3097 be32_to_cpu(journal->j_superblock->s_nr_users)); 3098 goto out_journal; 3099 } 3100 EXT4_SB(sb)->journal_bdev = bdev; 3101 ext4_init_journal_params(sb, journal); 3102 return journal; 3103 3104 out_journal: 3105 jbd2_journal_destroy(journal); 3106 out_bdev: 3107 ext4_blkdev_put(bdev); 3108 return NULL; 3109 } 3110 3111 static int ext4_load_journal(struct super_block *sb, 3112 struct ext4_super_block *es, 3113 unsigned long journal_devnum) 3114 { 3115 journal_t *journal; 3116 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); 3117 dev_t journal_dev; 3118 int err = 0; 3119 int really_read_only; 3120 3121 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 3122 3123 if (journal_devnum && 3124 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 3125 ext4_msg(sb, KERN_INFO, "external journal device major/minor " 3126 "numbers have changed"); 3127 journal_dev = new_decode_dev(journal_devnum); 3128 } else 3129 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); 3130 3131 really_read_only = bdev_read_only(sb->s_bdev); 3132 3133 /* 3134 * Are we loading a blank journal or performing recovery after a 3135 * crash? For recovery, we need to check in advance whether we 3136 * can get read-write access to the device. 3137 */ 3138 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 3139 if (sb->s_flags & MS_RDONLY) { 3140 ext4_msg(sb, KERN_INFO, "INFO: recovery " 3141 "required on readonly filesystem"); 3142 if (really_read_only) { 3143 ext4_msg(sb, KERN_ERR, "write access " 3144 "unavailable, cannot proceed"); 3145 return -EROFS; 3146 } 3147 ext4_msg(sb, KERN_INFO, "write access will " 3148 "be enabled during recovery"); 3149 } 3150 } 3151 3152 if (journal_inum && journal_dev) { 3153 ext4_msg(sb, KERN_ERR, "filesystem has both journal " 3154 "and inode journals!"); 3155 return -EINVAL; 3156 } 3157 3158 if (journal_inum) { 3159 if (!(journal = ext4_get_journal(sb, journal_inum))) 3160 return -EINVAL; 3161 } else { 3162 if (!(journal = ext4_get_dev_journal(sb, journal_dev))) 3163 return -EINVAL; 3164 } 3165 3166 if (journal->j_flags & JBD2_BARRIER) 3167 ext4_msg(sb, KERN_INFO, "barriers enabled"); 3168 else 3169 ext4_msg(sb, KERN_INFO, "barriers disabled"); 3170 3171 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { 3172 err = jbd2_journal_update_format(journal); 3173 if (err) { 3174 ext4_msg(sb, KERN_ERR, "error updating journal"); 3175 jbd2_journal_destroy(journal); 3176 return err; 3177 } 3178 } 3179 3180 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) 3181 err = jbd2_journal_wipe(journal, !really_read_only); 3182 if (!err) 3183 err = jbd2_journal_load(journal); 3184 3185 if (err) { 3186 ext4_msg(sb, KERN_ERR, "error loading journal"); 3187 jbd2_journal_destroy(journal); 3188 return err; 3189 } 3190 3191 EXT4_SB(sb)->s_journal = journal; 3192 ext4_clear_journal_err(sb, es); 3193 3194 if (journal_devnum && 3195 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 3196 es->s_journal_dev = cpu_to_le32(journal_devnum); 3197 3198 /* Make sure we flush the recovery flag to disk. */ 3199 ext4_commit_super(sb, 1); 3200 } 3201 3202 return 0; 3203 } 3204 3205 static int ext4_commit_super(struct super_block *sb, int sync) 3206 { 3207 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 3208 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; 3209 int error = 0; 3210 3211 if (!sbh) 3212 return error; 3213 if (buffer_write_io_error(sbh)) { 3214 /* 3215 * Oh, dear. A previous attempt to write the 3216 * superblock failed. This could happen because the 3217 * USB device was yanked out. Or it could happen to 3218 * be a transient write error and maybe the block will 3219 * be remapped. Nothing we can do but to retry the 3220 * write and hope for the best. 3221 */ 3222 ext4_msg(sb, KERN_ERR, "previous I/O error to " 3223 "superblock detected"); 3224 clear_buffer_write_io_error(sbh); 3225 set_buffer_uptodate(sbh); 3226 } 3227 es->s_wtime = cpu_to_le32(get_seconds()); 3228 es->s_kbytes_written = 3229 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written + 3230 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - 3231 EXT4_SB(sb)->s_sectors_written_start) >> 1)); 3232 ext4_free_blocks_count_set(es, percpu_counter_sum_positive( 3233 &EXT4_SB(sb)->s_freeblocks_counter)); 3234 es->s_free_inodes_count = cpu_to_le32(percpu_counter_sum_positive( 3235 &EXT4_SB(sb)->s_freeinodes_counter)); 3236 sb->s_dirt = 0; 3237 BUFFER_TRACE(sbh, "marking dirty"); 3238 mark_buffer_dirty(sbh); 3239 if (sync) { 3240 error = sync_dirty_buffer(sbh); 3241 if (error) 3242 return error; 3243 3244 error = buffer_write_io_error(sbh); 3245 if (error) { 3246 ext4_msg(sb, KERN_ERR, "I/O error while writing " 3247 "superblock"); 3248 clear_buffer_write_io_error(sbh); 3249 set_buffer_uptodate(sbh); 3250 } 3251 } 3252 return error; 3253 } 3254 3255 /* 3256 * Have we just finished recovery? If so, and if we are mounting (or 3257 * remounting) the filesystem readonly, then we will end up with a 3258 * consistent fs on disk. Record that fact. 3259 */ 3260 static void ext4_mark_recovery_complete(struct super_block *sb, 3261 struct ext4_super_block *es) 3262 { 3263 journal_t *journal = EXT4_SB(sb)->s_journal; 3264 3265 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 3266 BUG_ON(journal != NULL); 3267 return; 3268 } 3269 jbd2_journal_lock_updates(journal); 3270 if (jbd2_journal_flush(journal) < 0) 3271 goto out; 3272 3273 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && 3274 sb->s_flags & MS_RDONLY) { 3275 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 3276 ext4_commit_super(sb, 1); 3277 } 3278 3279 out: 3280 jbd2_journal_unlock_updates(journal); 3281 } 3282 3283 /* 3284 * If we are mounting (or read-write remounting) a filesystem whose journal 3285 * has recorded an error from a previous lifetime, move that error to the 3286 * main filesystem now. 3287 */ 3288 static void ext4_clear_journal_err(struct super_block *sb, 3289 struct ext4_super_block *es) 3290 { 3291 journal_t *journal; 3292 int j_errno; 3293 const char *errstr; 3294 3295 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); 3296 3297 journal = EXT4_SB(sb)->s_journal; 3298 3299 /* 3300 * Now check for any error status which may have been recorded in the 3301 * journal by a prior ext4_error() or ext4_abort() 3302 */ 3303 3304 j_errno = jbd2_journal_errno(journal); 3305 if (j_errno) { 3306 char nbuf[16]; 3307 3308 errstr = ext4_decode_error(sb, j_errno, nbuf); 3309 ext4_warning(sb, __func__, "Filesystem error recorded " 3310 "from previous mount: %s", errstr); 3311 ext4_warning(sb, __func__, "Marking fs in need of " 3312 "filesystem check."); 3313 3314 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 3315 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 3316 ext4_commit_super(sb, 1); 3317 3318 jbd2_journal_clear_err(journal); 3319 } 3320 } 3321 3322 /* 3323 * Force the running and committing transactions to commit, 3324 * and wait on the commit. 3325 */ 3326 int ext4_force_commit(struct super_block *sb) 3327 { 3328 journal_t *journal; 3329 int ret = 0; 3330 3331 if (sb->s_flags & MS_RDONLY) 3332 return 0; 3333 3334 journal = EXT4_SB(sb)->s_journal; 3335 if (journal) 3336 ret = ext4_journal_force_commit(journal); 3337 3338 return ret; 3339 } 3340 3341 static void ext4_write_super(struct super_block *sb) 3342 { 3343 lock_super(sb); 3344 ext4_commit_super(sb, 1); 3345 unlock_super(sb); 3346 } 3347 3348 static int ext4_sync_fs(struct super_block *sb, int wait) 3349 { 3350 int ret = 0; 3351 tid_t target; 3352 3353 trace_ext4_sync_fs(sb, wait); 3354 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) { 3355 if (wait) 3356 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target); 3357 } 3358 return ret; 3359 } 3360 3361 /* 3362 * LVM calls this function before a (read-only) snapshot is created. This 3363 * gives us a chance to flush the journal completely and mark the fs clean. 3364 */ 3365 static int ext4_freeze(struct super_block *sb) 3366 { 3367 int error = 0; 3368 journal_t *journal; 3369 3370 if (sb->s_flags & MS_RDONLY) 3371 return 0; 3372 3373 journal = EXT4_SB(sb)->s_journal; 3374 3375 /* Now we set up the journal barrier. */ 3376 jbd2_journal_lock_updates(journal); 3377 3378 /* 3379 * Don't clear the needs_recovery flag if we failed to flush 3380 * the journal. 3381 */ 3382 error = jbd2_journal_flush(journal); 3383 if (error < 0) { 3384 out: 3385 jbd2_journal_unlock_updates(journal); 3386 return error; 3387 } 3388 3389 /* Journal blocked and flushed, clear needs_recovery flag. */ 3390 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 3391 error = ext4_commit_super(sb, 1); 3392 if (error) 3393 goto out; 3394 return 0; 3395 } 3396 3397 /* 3398 * Called by LVM after the snapshot is done. We need to reset the RECOVER 3399 * flag here, even though the filesystem is not technically dirty yet. 3400 */ 3401 static int ext4_unfreeze(struct super_block *sb) 3402 { 3403 if (sb->s_flags & MS_RDONLY) 3404 return 0; 3405 3406 lock_super(sb); 3407 /* Reset the needs_recovery flag before the fs is unlocked. */ 3408 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 3409 ext4_commit_super(sb, 1); 3410 unlock_super(sb); 3411 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 3412 return 0; 3413 } 3414 3415 static int ext4_remount(struct super_block *sb, int *flags, char *data) 3416 { 3417 struct ext4_super_block *es; 3418 struct ext4_sb_info *sbi = EXT4_SB(sb); 3419 ext4_fsblk_t n_blocks_count = 0; 3420 unsigned long old_sb_flags; 3421 struct ext4_mount_options old_opts; 3422 ext4_group_t g; 3423 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; 3424 int err; 3425 #ifdef CONFIG_QUOTA 3426 int i; 3427 #endif 3428 3429 lock_kernel(); 3430 3431 /* Store the original options */ 3432 lock_super(sb); 3433 old_sb_flags = sb->s_flags; 3434 old_opts.s_mount_opt = sbi->s_mount_opt; 3435 old_opts.s_resuid = sbi->s_resuid; 3436 old_opts.s_resgid = sbi->s_resgid; 3437 old_opts.s_commit_interval = sbi->s_commit_interval; 3438 old_opts.s_min_batch_time = sbi->s_min_batch_time; 3439 old_opts.s_max_batch_time = sbi->s_max_batch_time; 3440 #ifdef CONFIG_QUOTA 3441 old_opts.s_jquota_fmt = sbi->s_jquota_fmt; 3442 for (i = 0; i < MAXQUOTAS; i++) 3443 old_opts.s_qf_names[i] = sbi->s_qf_names[i]; 3444 #endif 3445 if (sbi->s_journal && sbi->s_journal->j_task->io_context) 3446 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio; 3447 3448 /* 3449 * Allow the "check" option to be passed as a remount option. 3450 */ 3451 if (!parse_options(data, sb, NULL, &journal_ioprio, 3452 &n_blocks_count, 1)) { 3453 err = -EINVAL; 3454 goto restore_opts; 3455 } 3456 3457 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) 3458 ext4_abort(sb, __func__, "Abort forced by user"); 3459 3460 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 3461 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 3462 3463 es = sbi->s_es; 3464 3465 if (sbi->s_journal) { 3466 ext4_init_journal_params(sb, sbi->s_journal); 3467 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); 3468 } 3469 3470 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || 3471 n_blocks_count > ext4_blocks_count(es)) { 3472 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) { 3473 err = -EROFS; 3474 goto restore_opts; 3475 } 3476 3477 if (*flags & MS_RDONLY) { 3478 /* 3479 * First of all, the unconditional stuff we have to do 3480 * to disable replay of the journal when we next remount 3481 */ 3482 sb->s_flags |= MS_RDONLY; 3483 3484 /* 3485 * OK, test if we are remounting a valid rw partition 3486 * readonly, and if so set the rdonly flag and then 3487 * mark the partition as valid again. 3488 */ 3489 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && 3490 (sbi->s_mount_state & EXT4_VALID_FS)) 3491 es->s_state = cpu_to_le16(sbi->s_mount_state); 3492 3493 if (sbi->s_journal) 3494 ext4_mark_recovery_complete(sb, es); 3495 } else { 3496 int ret; 3497 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb, 3498 ~EXT4_FEATURE_RO_COMPAT_SUPP))) { 3499 ext4_msg(sb, KERN_WARNING, "couldn't " 3500 "remount RDWR because of unsupported " 3501 "optional features (%x)", 3502 (le32_to_cpu(sbi->s_es->s_feature_ro_compat) & 3503 ~EXT4_FEATURE_RO_COMPAT_SUPP)); 3504 err = -EROFS; 3505 goto restore_opts; 3506 } 3507 3508 /* 3509 * Make sure the group descriptor checksums 3510 * are sane. If they aren't, refuse to remount r/w. 3511 */ 3512 for (g = 0; g < sbi->s_groups_count; g++) { 3513 struct ext4_group_desc *gdp = 3514 ext4_get_group_desc(sb, g, NULL); 3515 3516 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) { 3517 ext4_msg(sb, KERN_ERR, 3518 "ext4_remount: Checksum for group %u failed (%u!=%u)", 3519 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)), 3520 le16_to_cpu(gdp->bg_checksum)); 3521 err = -EINVAL; 3522 goto restore_opts; 3523 } 3524 } 3525 3526 /* 3527 * If we have an unprocessed orphan list hanging 3528 * around from a previously readonly bdev mount, 3529 * require a full umount/remount for now. 3530 */ 3531 if (es->s_last_orphan) { 3532 ext4_msg(sb, KERN_WARNING, "Couldn't " 3533 "remount RDWR because of unprocessed " 3534 "orphan inode list. Please " 3535 "umount/remount instead"); 3536 err = -EINVAL; 3537 goto restore_opts; 3538 } 3539 3540 /* 3541 * Mounting a RDONLY partition read-write, so reread 3542 * and store the current valid flag. (It may have 3543 * been changed by e2fsck since we originally mounted 3544 * the partition.) 3545 */ 3546 if (sbi->s_journal) 3547 ext4_clear_journal_err(sb, es); 3548 sbi->s_mount_state = le16_to_cpu(es->s_state); 3549 if ((err = ext4_group_extend(sb, es, n_blocks_count))) 3550 goto restore_opts; 3551 if (!ext4_setup_super(sb, es, 0)) 3552 sb->s_flags &= ~MS_RDONLY; 3553 } 3554 } 3555 ext4_setup_system_zone(sb); 3556 if (sbi->s_journal == NULL) 3557 ext4_commit_super(sb, 1); 3558 3559 #ifdef CONFIG_QUOTA 3560 /* Release old quota file names */ 3561 for (i = 0; i < MAXQUOTAS; i++) 3562 if (old_opts.s_qf_names[i] && 3563 old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 3564 kfree(old_opts.s_qf_names[i]); 3565 #endif 3566 unlock_super(sb); 3567 unlock_kernel(); 3568 return 0; 3569 3570 restore_opts: 3571 sb->s_flags = old_sb_flags; 3572 sbi->s_mount_opt = old_opts.s_mount_opt; 3573 sbi->s_resuid = old_opts.s_resuid; 3574 sbi->s_resgid = old_opts.s_resgid; 3575 sbi->s_commit_interval = old_opts.s_commit_interval; 3576 sbi->s_min_batch_time = old_opts.s_min_batch_time; 3577 sbi->s_max_batch_time = old_opts.s_max_batch_time; 3578 #ifdef CONFIG_QUOTA 3579 sbi->s_jquota_fmt = old_opts.s_jquota_fmt; 3580 for (i = 0; i < MAXQUOTAS; i++) { 3581 if (sbi->s_qf_names[i] && 3582 old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 3583 kfree(sbi->s_qf_names[i]); 3584 sbi->s_qf_names[i] = old_opts.s_qf_names[i]; 3585 } 3586 #endif 3587 unlock_super(sb); 3588 unlock_kernel(); 3589 return err; 3590 } 3591 3592 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf) 3593 { 3594 struct super_block *sb = dentry->d_sb; 3595 struct ext4_sb_info *sbi = EXT4_SB(sb); 3596 struct ext4_super_block *es = sbi->s_es; 3597 u64 fsid; 3598 3599 if (test_opt(sb, MINIX_DF)) { 3600 sbi->s_overhead_last = 0; 3601 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) { 3602 ext4_group_t i, ngroups = ext4_get_groups_count(sb); 3603 ext4_fsblk_t overhead = 0; 3604 3605 /* 3606 * Compute the overhead (FS structures). This is constant 3607 * for a given filesystem unless the number of block groups 3608 * changes so we cache the previous value until it does. 3609 */ 3610 3611 /* 3612 * All of the blocks before first_data_block are 3613 * overhead 3614 */ 3615 overhead = le32_to_cpu(es->s_first_data_block); 3616 3617 /* 3618 * Add the overhead attributed to the superblock and 3619 * block group descriptors. If the sparse superblocks 3620 * feature is turned on, then not all groups have this. 3621 */ 3622 for (i = 0; i < ngroups; i++) { 3623 overhead += ext4_bg_has_super(sb, i) + 3624 ext4_bg_num_gdb(sb, i); 3625 cond_resched(); 3626 } 3627 3628 /* 3629 * Every block group has an inode bitmap, a block 3630 * bitmap, and an inode table. 3631 */ 3632 overhead += ngroups * (2 + sbi->s_itb_per_group); 3633 sbi->s_overhead_last = overhead; 3634 smp_wmb(); 3635 sbi->s_blocks_last = ext4_blocks_count(es); 3636 } 3637 3638 buf->f_type = EXT4_SUPER_MAGIC; 3639 buf->f_bsize = sb->s_blocksize; 3640 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last; 3641 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) - 3642 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter); 3643 ext4_free_blocks_count_set(es, buf->f_bfree); 3644 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); 3645 if (buf->f_bfree < ext4_r_blocks_count(es)) 3646 buf->f_bavail = 0; 3647 buf->f_files = le32_to_cpu(es->s_inodes_count); 3648 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); 3649 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); 3650 buf->f_namelen = EXT4_NAME_LEN; 3651 fsid = le64_to_cpup((void *)es->s_uuid) ^ 3652 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 3653 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 3654 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 3655 3656 return 0; 3657 } 3658 3659 /* Helper function for writing quotas on sync - we need to start transaction 3660 * before quota file is locked for write. Otherwise the are possible deadlocks: 3661 * Process 1 Process 2 3662 * ext4_create() quota_sync() 3663 * jbd2_journal_start() write_dquot() 3664 * vfs_dq_init() down(dqio_mutex) 3665 * down(dqio_mutex) jbd2_journal_start() 3666 * 3667 */ 3668 3669 #ifdef CONFIG_QUOTA 3670 3671 static inline struct inode *dquot_to_inode(struct dquot *dquot) 3672 { 3673 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; 3674 } 3675 3676 static int ext4_write_dquot(struct dquot *dquot) 3677 { 3678 int ret, err; 3679 handle_t *handle; 3680 struct inode *inode; 3681 3682 inode = dquot_to_inode(dquot); 3683 handle = ext4_journal_start(inode, 3684 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 3685 if (IS_ERR(handle)) 3686 return PTR_ERR(handle); 3687 ret = dquot_commit(dquot); 3688 err = ext4_journal_stop(handle); 3689 if (!ret) 3690 ret = err; 3691 return ret; 3692 } 3693 3694 static int ext4_acquire_dquot(struct dquot *dquot) 3695 { 3696 int ret, err; 3697 handle_t *handle; 3698 3699 handle = ext4_journal_start(dquot_to_inode(dquot), 3700 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 3701 if (IS_ERR(handle)) 3702 return PTR_ERR(handle); 3703 ret = dquot_acquire(dquot); 3704 err = ext4_journal_stop(handle); 3705 if (!ret) 3706 ret = err; 3707 return ret; 3708 } 3709 3710 static int ext4_release_dquot(struct dquot *dquot) 3711 { 3712 int ret, err; 3713 handle_t *handle; 3714 3715 handle = ext4_journal_start(dquot_to_inode(dquot), 3716 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 3717 if (IS_ERR(handle)) { 3718 /* Release dquot anyway to avoid endless cycle in dqput() */ 3719 dquot_release(dquot); 3720 return PTR_ERR(handle); 3721 } 3722 ret = dquot_release(dquot); 3723 err = ext4_journal_stop(handle); 3724 if (!ret) 3725 ret = err; 3726 return ret; 3727 } 3728 3729 static int ext4_mark_dquot_dirty(struct dquot *dquot) 3730 { 3731 /* Are we journaling quotas? */ 3732 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || 3733 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { 3734 dquot_mark_dquot_dirty(dquot); 3735 return ext4_write_dquot(dquot); 3736 } else { 3737 return dquot_mark_dquot_dirty(dquot); 3738 } 3739 } 3740 3741 static int ext4_write_info(struct super_block *sb, int type) 3742 { 3743 int ret, err; 3744 handle_t *handle; 3745 3746 /* Data block + inode block */ 3747 handle = ext4_journal_start(sb->s_root->d_inode, 2); 3748 if (IS_ERR(handle)) 3749 return PTR_ERR(handle); 3750 ret = dquot_commit_info(sb, type); 3751 err = ext4_journal_stop(handle); 3752 if (!ret) 3753 ret = err; 3754 return ret; 3755 } 3756 3757 /* 3758 * Turn on quotas during mount time - we need to find 3759 * the quota file and such... 3760 */ 3761 static int ext4_quota_on_mount(struct super_block *sb, int type) 3762 { 3763 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], 3764 EXT4_SB(sb)->s_jquota_fmt, type); 3765 } 3766 3767 /* 3768 * Standard function to be called on quota_on 3769 */ 3770 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 3771 char *name, int remount) 3772 { 3773 int err; 3774 struct path path; 3775 3776 if (!test_opt(sb, QUOTA)) 3777 return -EINVAL; 3778 /* When remounting, no checks are needed and in fact, name is NULL */ 3779 if (remount) 3780 return vfs_quota_on(sb, type, format_id, name, remount); 3781 3782 err = kern_path(name, LOOKUP_FOLLOW, &path); 3783 if (err) 3784 return err; 3785 3786 /* Quotafile not on the same filesystem? */ 3787 if (path.mnt->mnt_sb != sb) { 3788 path_put(&path); 3789 return -EXDEV; 3790 } 3791 /* Journaling quota? */ 3792 if (EXT4_SB(sb)->s_qf_names[type]) { 3793 /* Quotafile not in fs root? */ 3794 if (path.dentry->d_parent != sb->s_root) 3795 ext4_msg(sb, KERN_WARNING, 3796 "Quota file not on filesystem root. " 3797 "Journaled quota will not work"); 3798 } 3799 3800 /* 3801 * When we journal data on quota file, we have to flush journal to see 3802 * all updates to the file when we bypass pagecache... 3803 */ 3804 if (EXT4_SB(sb)->s_journal && 3805 ext4_should_journal_data(path.dentry->d_inode)) { 3806 /* 3807 * We don't need to lock updates but journal_flush() could 3808 * otherwise be livelocked... 3809 */ 3810 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 3811 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 3812 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 3813 if (err) { 3814 path_put(&path); 3815 return err; 3816 } 3817 } 3818 3819 err = vfs_quota_on_path(sb, type, format_id, &path); 3820 path_put(&path); 3821 return err; 3822 } 3823 3824 /* Read data from quotafile - avoid pagecache and such because we cannot afford 3825 * acquiring the locks... As quota files are never truncated and quota code 3826 * itself serializes the operations (and noone else should touch the files) 3827 * we don't have to be afraid of races */ 3828 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 3829 size_t len, loff_t off) 3830 { 3831 struct inode *inode = sb_dqopt(sb)->files[type]; 3832 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 3833 int err = 0; 3834 int offset = off & (sb->s_blocksize - 1); 3835 int tocopy; 3836 size_t toread; 3837 struct buffer_head *bh; 3838 loff_t i_size = i_size_read(inode); 3839 3840 if (off > i_size) 3841 return 0; 3842 if (off+len > i_size) 3843 len = i_size-off; 3844 toread = len; 3845 while (toread > 0) { 3846 tocopy = sb->s_blocksize - offset < toread ? 3847 sb->s_blocksize - offset : toread; 3848 bh = ext4_bread(NULL, inode, blk, 0, &err); 3849 if (err) 3850 return err; 3851 if (!bh) /* A hole? */ 3852 memset(data, 0, tocopy); 3853 else 3854 memcpy(data, bh->b_data+offset, tocopy); 3855 brelse(bh); 3856 offset = 0; 3857 toread -= tocopy; 3858 data += tocopy; 3859 blk++; 3860 } 3861 return len; 3862 } 3863 3864 /* Write to quotafile (we know the transaction is already started and has 3865 * enough credits) */ 3866 static ssize_t ext4_quota_write(struct super_block *sb, int type, 3867 const char *data, size_t len, loff_t off) 3868 { 3869 struct inode *inode = sb_dqopt(sb)->files[type]; 3870 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 3871 int err = 0; 3872 int offset = off & (sb->s_blocksize - 1); 3873 int tocopy; 3874 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL; 3875 size_t towrite = len; 3876 struct buffer_head *bh; 3877 handle_t *handle = journal_current_handle(); 3878 3879 if (EXT4_SB(sb)->s_journal && !handle) { 3880 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" 3881 " cancelled because transaction is not started", 3882 (unsigned long long)off, (unsigned long long)len); 3883 return -EIO; 3884 } 3885 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 3886 while (towrite > 0) { 3887 tocopy = sb->s_blocksize - offset < towrite ? 3888 sb->s_blocksize - offset : towrite; 3889 bh = ext4_bread(handle, inode, blk, 1, &err); 3890 if (!bh) 3891 goto out; 3892 if (journal_quota) { 3893 err = ext4_journal_get_write_access(handle, bh); 3894 if (err) { 3895 brelse(bh); 3896 goto out; 3897 } 3898 } 3899 lock_buffer(bh); 3900 memcpy(bh->b_data+offset, data, tocopy); 3901 flush_dcache_page(bh->b_page); 3902 unlock_buffer(bh); 3903 if (journal_quota) 3904 err = ext4_handle_dirty_metadata(handle, NULL, bh); 3905 else { 3906 /* Always do at least ordered writes for quotas */ 3907 err = ext4_jbd2_file_inode(handle, inode); 3908 mark_buffer_dirty(bh); 3909 } 3910 brelse(bh); 3911 if (err) 3912 goto out; 3913 offset = 0; 3914 towrite -= tocopy; 3915 data += tocopy; 3916 blk++; 3917 } 3918 out: 3919 if (len == towrite) { 3920 mutex_unlock(&inode->i_mutex); 3921 return err; 3922 } 3923 if (inode->i_size < off+len-towrite) { 3924 i_size_write(inode, off+len-towrite); 3925 EXT4_I(inode)->i_disksize = inode->i_size; 3926 } 3927 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 3928 ext4_mark_inode_dirty(handle, inode); 3929 mutex_unlock(&inode->i_mutex); 3930 return len - towrite; 3931 } 3932 3933 #endif 3934 3935 static int ext4_get_sb(struct file_system_type *fs_type, int flags, 3936 const char *dev_name, void *data, struct vfsmount *mnt) 3937 { 3938 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super,mnt); 3939 } 3940 3941 static struct file_system_type ext4_fs_type = { 3942 .owner = THIS_MODULE, 3943 .name = "ext4", 3944 .get_sb = ext4_get_sb, 3945 .kill_sb = kill_block_super, 3946 .fs_flags = FS_REQUIRES_DEV, 3947 }; 3948 3949 #ifdef CONFIG_EXT4DEV_COMPAT 3950 static int ext4dev_get_sb(struct file_system_type *fs_type, int flags, 3951 const char *dev_name, void *data,struct vfsmount *mnt) 3952 { 3953 printk(KERN_WARNING "EXT4-fs (%s): Update your userspace programs " 3954 "to mount using ext4\n", dev_name); 3955 printk(KERN_WARNING "EXT4-fs (%s): ext4dev backwards compatibility " 3956 "will go away by 2.6.31\n", dev_name); 3957 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super,mnt); 3958 } 3959 3960 static struct file_system_type ext4dev_fs_type = { 3961 .owner = THIS_MODULE, 3962 .name = "ext4dev", 3963 .get_sb = ext4dev_get_sb, 3964 .kill_sb = kill_block_super, 3965 .fs_flags = FS_REQUIRES_DEV, 3966 }; 3967 MODULE_ALIAS("ext4dev"); 3968 #endif 3969 3970 static int __init init_ext4_fs(void) 3971 { 3972 int err; 3973 3974 err = init_ext4_system_zone(); 3975 if (err) 3976 return err; 3977 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj); 3978 if (!ext4_kset) 3979 goto out4; 3980 ext4_proc_root = proc_mkdir("fs/ext4", NULL); 3981 err = init_ext4_mballoc(); 3982 if (err) 3983 goto out3; 3984 3985 err = init_ext4_xattr(); 3986 if (err) 3987 goto out2; 3988 err = init_inodecache(); 3989 if (err) 3990 goto out1; 3991 err = register_filesystem(&ext4_fs_type); 3992 if (err) 3993 goto out; 3994 #ifdef CONFIG_EXT4DEV_COMPAT 3995 err = register_filesystem(&ext4dev_fs_type); 3996 if (err) { 3997 unregister_filesystem(&ext4_fs_type); 3998 goto out; 3999 } 4000 #endif 4001 return 0; 4002 out: 4003 destroy_inodecache(); 4004 out1: 4005 exit_ext4_xattr(); 4006 out2: 4007 exit_ext4_mballoc(); 4008 out3: 4009 remove_proc_entry("fs/ext4", NULL); 4010 kset_unregister(ext4_kset); 4011 out4: 4012 exit_ext4_system_zone(); 4013 return err; 4014 } 4015 4016 static void __exit exit_ext4_fs(void) 4017 { 4018 unregister_filesystem(&ext4_fs_type); 4019 #ifdef CONFIG_EXT4DEV_COMPAT 4020 unregister_filesystem(&ext4dev_fs_type); 4021 #endif 4022 destroy_inodecache(); 4023 exit_ext4_xattr(); 4024 exit_ext4_mballoc(); 4025 remove_proc_entry("fs/ext4", NULL); 4026 kset_unregister(ext4_kset); 4027 exit_ext4_system_zone(); 4028 } 4029 4030 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); 4031 MODULE_DESCRIPTION("Fourth Extended Filesystem"); 4032 MODULE_LICENSE("GPL"); 4033 module_init(init_ext4_fs) 4034 module_exit(exit_ext4_fs) 4035