1 /* 2 * linux/fs/ext4/super.c 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/fs/minix/inode.c 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 * 15 * Big-endian to little-endian byte-swapping/bitmaps by 16 * David S. Miller (davem@caip.rutgers.edu), 1995 17 */ 18 19 #include <linux/module.h> 20 #include <linux/string.h> 21 #include <linux/fs.h> 22 #include <linux/time.h> 23 #include <linux/jbd2.h> 24 #include <linux/ext4_fs.h> 25 #include <linux/ext4_jbd2.h> 26 #include <linux/slab.h> 27 #include <linux/init.h> 28 #include <linux/blkdev.h> 29 #include <linux/parser.h> 30 #include <linux/smp_lock.h> 31 #include <linux/buffer_head.h> 32 #include <linux/exportfs.h> 33 #include <linux/vfs.h> 34 #include <linux/random.h> 35 #include <linux/mount.h> 36 #include <linux/namei.h> 37 #include <linux/quotaops.h> 38 #include <linux/seq_file.h> 39 #include <linux/log2.h> 40 #include <linux/crc16.h> 41 42 #include <asm/uaccess.h> 43 44 #include "xattr.h" 45 #include "acl.h" 46 #include "namei.h" 47 #include "group.h" 48 49 static int ext4_load_journal(struct super_block *, struct ext4_super_block *, 50 unsigned long journal_devnum); 51 static int ext4_create_journal(struct super_block *, struct ext4_super_block *, 52 unsigned int); 53 static void ext4_commit_super (struct super_block * sb, 54 struct ext4_super_block * es, 55 int sync); 56 static void ext4_mark_recovery_complete(struct super_block * sb, 57 struct ext4_super_block * es); 58 static void ext4_clear_journal_err(struct super_block * sb, 59 struct ext4_super_block * es); 60 static int ext4_sync_fs(struct super_block *sb, int wait); 61 static const char *ext4_decode_error(struct super_block * sb, int errno, 62 char nbuf[16]); 63 static int ext4_remount (struct super_block * sb, int * flags, char * data); 64 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf); 65 static void ext4_unlockfs(struct super_block *sb); 66 static void ext4_write_super (struct super_block * sb); 67 static void ext4_write_super_lockfs(struct super_block *sb); 68 69 70 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, 71 struct ext4_group_desc *bg) 72 { 73 return le32_to_cpu(bg->bg_block_bitmap_lo) | 74 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 75 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); 76 } 77 78 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, 79 struct ext4_group_desc *bg) 80 { 81 return le32_to_cpu(bg->bg_inode_bitmap_lo) | 82 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 83 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); 84 } 85 86 ext4_fsblk_t ext4_inode_table(struct super_block *sb, 87 struct ext4_group_desc *bg) 88 { 89 return le32_to_cpu(bg->bg_inode_table_lo) | 90 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? 91 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); 92 } 93 94 void ext4_block_bitmap_set(struct super_block *sb, 95 struct ext4_group_desc *bg, ext4_fsblk_t blk) 96 { 97 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); 98 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 99 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); 100 } 101 102 void ext4_inode_bitmap_set(struct super_block *sb, 103 struct ext4_group_desc *bg, ext4_fsblk_t blk) 104 { 105 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); 106 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 107 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); 108 } 109 110 void ext4_inode_table_set(struct super_block *sb, 111 struct ext4_group_desc *bg, ext4_fsblk_t blk) 112 { 113 bg->bg_inode_table_lo = cpu_to_le32((u32)blk); 114 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) 115 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); 116 } 117 118 /* 119 * Wrappers for jbd2_journal_start/end. 120 * 121 * The only special thing we need to do here is to make sure that all 122 * journal_end calls result in the superblock being marked dirty, so 123 * that sync() will call the filesystem's write_super callback if 124 * appropriate. 125 */ 126 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) 127 { 128 journal_t *journal; 129 130 if (sb->s_flags & MS_RDONLY) 131 return ERR_PTR(-EROFS); 132 133 /* Special case here: if the journal has aborted behind our 134 * backs (eg. EIO in the commit thread), then we still need to 135 * take the FS itself readonly cleanly. */ 136 journal = EXT4_SB(sb)->s_journal; 137 if (is_journal_aborted(journal)) { 138 ext4_abort(sb, __FUNCTION__, 139 "Detected aborted journal"); 140 return ERR_PTR(-EROFS); 141 } 142 143 return jbd2_journal_start(journal, nblocks); 144 } 145 146 /* 147 * The only special thing we need to do here is to make sure that all 148 * jbd2_journal_stop calls result in the superblock being marked dirty, so 149 * that sync() will call the filesystem's write_super callback if 150 * appropriate. 151 */ 152 int __ext4_journal_stop(const char *where, handle_t *handle) 153 { 154 struct super_block *sb; 155 int err; 156 int rc; 157 158 sb = handle->h_transaction->t_journal->j_private; 159 err = handle->h_err; 160 rc = jbd2_journal_stop(handle); 161 162 if (!err) 163 err = rc; 164 if (err) 165 __ext4_std_error(sb, where, err); 166 return err; 167 } 168 169 void ext4_journal_abort_handle(const char *caller, const char *err_fn, 170 struct buffer_head *bh, handle_t *handle, int err) 171 { 172 char nbuf[16]; 173 const char *errstr = ext4_decode_error(NULL, err, nbuf); 174 175 if (bh) 176 BUFFER_TRACE(bh, "abort"); 177 178 if (!handle->h_err) 179 handle->h_err = err; 180 181 if (is_handle_aborted(handle)) 182 return; 183 184 printk(KERN_ERR "%s: aborting transaction: %s in %s\n", 185 caller, errstr, err_fn); 186 187 jbd2_journal_abort_handle(handle); 188 } 189 190 /* Deal with the reporting of failure conditions on a filesystem such as 191 * inconsistencies detected or read IO failures. 192 * 193 * On ext2, we can store the error state of the filesystem in the 194 * superblock. That is not possible on ext4, because we may have other 195 * write ordering constraints on the superblock which prevent us from 196 * writing it out straight away; and given that the journal is about to 197 * be aborted, we can't rely on the current, or future, transactions to 198 * write out the superblock safely. 199 * 200 * We'll just use the jbd2_journal_abort() error code to record an error in 201 * the journal instead. On recovery, the journal will compain about 202 * that error until we've noted it down and cleared it. 203 */ 204 205 static void ext4_handle_error(struct super_block *sb) 206 { 207 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 208 209 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 210 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 211 212 if (sb->s_flags & MS_RDONLY) 213 return; 214 215 if (!test_opt (sb, ERRORS_CONT)) { 216 journal_t *journal = EXT4_SB(sb)->s_journal; 217 218 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; 219 if (journal) 220 jbd2_journal_abort(journal, -EIO); 221 } 222 if (test_opt (sb, ERRORS_RO)) { 223 printk (KERN_CRIT "Remounting filesystem read-only\n"); 224 sb->s_flags |= MS_RDONLY; 225 } 226 ext4_commit_super(sb, es, 1); 227 if (test_opt(sb, ERRORS_PANIC)) 228 panic("EXT4-fs (device %s): panic forced after error\n", 229 sb->s_id); 230 } 231 232 void ext4_error (struct super_block * sb, const char * function, 233 const char * fmt, ...) 234 { 235 va_list args; 236 237 va_start(args, fmt); 238 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function); 239 vprintk(fmt, args); 240 printk("\n"); 241 va_end(args); 242 243 ext4_handle_error(sb); 244 } 245 246 static const char *ext4_decode_error(struct super_block * sb, int errno, 247 char nbuf[16]) 248 { 249 char *errstr = NULL; 250 251 switch (errno) { 252 case -EIO: 253 errstr = "IO failure"; 254 break; 255 case -ENOMEM: 256 errstr = "Out of memory"; 257 break; 258 case -EROFS: 259 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT) 260 errstr = "Journal has aborted"; 261 else 262 errstr = "Readonly filesystem"; 263 break; 264 default: 265 /* If the caller passed in an extra buffer for unknown 266 * errors, textualise them now. Else we just return 267 * NULL. */ 268 if (nbuf) { 269 /* Check for truncated error codes... */ 270 if (snprintf(nbuf, 16, "error %d", -errno) >= 0) 271 errstr = nbuf; 272 } 273 break; 274 } 275 276 return errstr; 277 } 278 279 /* __ext4_std_error decodes expected errors from journaling functions 280 * automatically and invokes the appropriate error response. */ 281 282 void __ext4_std_error (struct super_block * sb, const char * function, 283 int errno) 284 { 285 char nbuf[16]; 286 const char *errstr; 287 288 /* Special case: if the error is EROFS, and we're not already 289 * inside a transaction, then there's really no point in logging 290 * an error. */ 291 if (errno == -EROFS && journal_current_handle() == NULL && 292 (sb->s_flags & MS_RDONLY)) 293 return; 294 295 errstr = ext4_decode_error(sb, errno, nbuf); 296 printk (KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n", 297 sb->s_id, function, errstr); 298 299 ext4_handle_error(sb); 300 } 301 302 /* 303 * ext4_abort is a much stronger failure handler than ext4_error. The 304 * abort function may be used to deal with unrecoverable failures such 305 * as journal IO errors or ENOMEM at a critical moment in log management. 306 * 307 * We unconditionally force the filesystem into an ABORT|READONLY state, 308 * unless the error response on the fs has been set to panic in which 309 * case we take the easy way out and panic immediately. 310 */ 311 312 void ext4_abort (struct super_block * sb, const char * function, 313 const char * fmt, ...) 314 { 315 va_list args; 316 317 printk (KERN_CRIT "ext4_abort called.\n"); 318 319 va_start(args, fmt); 320 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function); 321 vprintk(fmt, args); 322 printk("\n"); 323 va_end(args); 324 325 if (test_opt(sb, ERRORS_PANIC)) 326 panic("EXT4-fs panic from previous error\n"); 327 328 if (sb->s_flags & MS_RDONLY) 329 return; 330 331 printk(KERN_CRIT "Remounting filesystem read-only\n"); 332 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 333 sb->s_flags |= MS_RDONLY; 334 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; 335 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); 336 } 337 338 void ext4_warning (struct super_block * sb, const char * function, 339 const char * fmt, ...) 340 { 341 va_list args; 342 343 va_start(args, fmt); 344 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ", 345 sb->s_id, function); 346 vprintk(fmt, args); 347 printk("\n"); 348 va_end(args); 349 } 350 351 void ext4_update_dynamic_rev(struct super_block *sb) 352 { 353 struct ext4_super_block *es = EXT4_SB(sb)->s_es; 354 355 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) 356 return; 357 358 ext4_warning(sb, __FUNCTION__, 359 "updating to rev %d because of new feature flag, " 360 "running e2fsck is recommended", 361 EXT4_DYNAMIC_REV); 362 363 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); 364 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); 365 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); 366 /* leave es->s_feature_*compat flags alone */ 367 /* es->s_uuid will be set by e2fsck if empty */ 368 369 /* 370 * The rest of the superblock fields should be zero, and if not it 371 * means they are likely already in use, so leave them alone. We 372 * can leave it up to e2fsck to clean up any inconsistencies there. 373 */ 374 } 375 376 /* 377 * Open the external journal device 378 */ 379 static struct block_device *ext4_blkdev_get(dev_t dev) 380 { 381 struct block_device *bdev; 382 char b[BDEVNAME_SIZE]; 383 384 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); 385 if (IS_ERR(bdev)) 386 goto fail; 387 return bdev; 388 389 fail: 390 printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n", 391 __bdevname(dev, b), PTR_ERR(bdev)); 392 return NULL; 393 } 394 395 /* 396 * Release the journal device 397 */ 398 static int ext4_blkdev_put(struct block_device *bdev) 399 { 400 bd_release(bdev); 401 return blkdev_put(bdev); 402 } 403 404 static int ext4_blkdev_remove(struct ext4_sb_info *sbi) 405 { 406 struct block_device *bdev; 407 int ret = -ENODEV; 408 409 bdev = sbi->journal_bdev; 410 if (bdev) { 411 ret = ext4_blkdev_put(bdev); 412 sbi->journal_bdev = NULL; 413 } 414 return ret; 415 } 416 417 static inline struct inode *orphan_list_entry(struct list_head *l) 418 { 419 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; 420 } 421 422 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) 423 { 424 struct list_head *l; 425 426 printk(KERN_ERR "sb orphan head is %d\n", 427 le32_to_cpu(sbi->s_es->s_last_orphan)); 428 429 printk(KERN_ERR "sb_info orphan list:\n"); 430 list_for_each(l, &sbi->s_orphan) { 431 struct inode *inode = orphan_list_entry(l); 432 printk(KERN_ERR " " 433 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", 434 inode->i_sb->s_id, inode->i_ino, inode, 435 inode->i_mode, inode->i_nlink, 436 NEXT_ORPHAN(inode)); 437 } 438 } 439 440 static void ext4_put_super (struct super_block * sb) 441 { 442 struct ext4_sb_info *sbi = EXT4_SB(sb); 443 struct ext4_super_block *es = sbi->s_es; 444 int i; 445 446 ext4_ext_release(sb); 447 ext4_xattr_put_super(sb); 448 jbd2_journal_destroy(sbi->s_journal); 449 if (!(sb->s_flags & MS_RDONLY)) { 450 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 451 es->s_state = cpu_to_le16(sbi->s_mount_state); 452 BUFFER_TRACE(sbi->s_sbh, "marking dirty"); 453 mark_buffer_dirty(sbi->s_sbh); 454 ext4_commit_super(sb, es, 1); 455 } 456 457 for (i = 0; i < sbi->s_gdb_count; i++) 458 brelse(sbi->s_group_desc[i]); 459 kfree(sbi->s_group_desc); 460 percpu_counter_destroy(&sbi->s_freeblocks_counter); 461 percpu_counter_destroy(&sbi->s_freeinodes_counter); 462 percpu_counter_destroy(&sbi->s_dirs_counter); 463 brelse(sbi->s_sbh); 464 #ifdef CONFIG_QUOTA 465 for (i = 0; i < MAXQUOTAS; i++) 466 kfree(sbi->s_qf_names[i]); 467 #endif 468 469 /* Debugging code just in case the in-memory inode orphan list 470 * isn't empty. The on-disk one can be non-empty if we've 471 * detected an error and taken the fs readonly, but the 472 * in-memory list had better be clean by this point. */ 473 if (!list_empty(&sbi->s_orphan)) 474 dump_orphan_list(sb, sbi); 475 J_ASSERT(list_empty(&sbi->s_orphan)); 476 477 invalidate_bdev(sb->s_bdev); 478 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { 479 /* 480 * Invalidate the journal device's buffers. We don't want them 481 * floating about in memory - the physical journal device may 482 * hotswapped, and it breaks the `ro-after' testing code. 483 */ 484 sync_blockdev(sbi->journal_bdev); 485 invalidate_bdev(sbi->journal_bdev); 486 ext4_blkdev_remove(sbi); 487 } 488 sb->s_fs_info = NULL; 489 kfree(sbi); 490 return; 491 } 492 493 static struct kmem_cache *ext4_inode_cachep; 494 495 /* 496 * Called inside transaction, so use GFP_NOFS 497 */ 498 static struct inode *ext4_alloc_inode(struct super_block *sb) 499 { 500 struct ext4_inode_info *ei; 501 502 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); 503 if (!ei) 504 return NULL; 505 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 506 ei->i_acl = EXT4_ACL_NOT_CACHED; 507 ei->i_default_acl = EXT4_ACL_NOT_CACHED; 508 #endif 509 ei->i_block_alloc_info = NULL; 510 ei->vfs_inode.i_version = 1; 511 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); 512 return &ei->vfs_inode; 513 } 514 515 static void ext4_destroy_inode(struct inode *inode) 516 { 517 if (!list_empty(&(EXT4_I(inode)->i_orphan))) { 518 printk("EXT4 Inode %p: orphan list check failed!\n", 519 EXT4_I(inode)); 520 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, 521 EXT4_I(inode), sizeof(struct ext4_inode_info), 522 true); 523 dump_stack(); 524 } 525 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); 526 } 527 528 static void init_once(struct kmem_cache *cachep, void *foo) 529 { 530 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; 531 532 INIT_LIST_HEAD(&ei->i_orphan); 533 #ifdef CONFIG_EXT4DEV_FS_XATTR 534 init_rwsem(&ei->xattr_sem); 535 #endif 536 mutex_init(&ei->truncate_mutex); 537 inode_init_once(&ei->vfs_inode); 538 } 539 540 static int init_inodecache(void) 541 { 542 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", 543 sizeof(struct ext4_inode_info), 544 0, (SLAB_RECLAIM_ACCOUNT| 545 SLAB_MEM_SPREAD), 546 init_once); 547 if (ext4_inode_cachep == NULL) 548 return -ENOMEM; 549 return 0; 550 } 551 552 static void destroy_inodecache(void) 553 { 554 kmem_cache_destroy(ext4_inode_cachep); 555 } 556 557 static void ext4_clear_inode(struct inode *inode) 558 { 559 struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info; 560 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 561 if (EXT4_I(inode)->i_acl && 562 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) { 563 posix_acl_release(EXT4_I(inode)->i_acl); 564 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED; 565 } 566 if (EXT4_I(inode)->i_default_acl && 567 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) { 568 posix_acl_release(EXT4_I(inode)->i_default_acl); 569 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED; 570 } 571 #endif 572 ext4_discard_reservation(inode); 573 EXT4_I(inode)->i_block_alloc_info = NULL; 574 if (unlikely(rsv)) 575 kfree(rsv); 576 } 577 578 static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb) 579 { 580 #if defined(CONFIG_QUOTA) 581 struct ext4_sb_info *sbi = EXT4_SB(sb); 582 583 if (sbi->s_jquota_fmt) 584 seq_printf(seq, ",jqfmt=%s", 585 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0"); 586 587 if (sbi->s_qf_names[USRQUOTA]) 588 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); 589 590 if (sbi->s_qf_names[GRPQUOTA]) 591 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); 592 593 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) 594 seq_puts(seq, ",usrquota"); 595 596 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) 597 seq_puts(seq, ",grpquota"); 598 #endif 599 } 600 601 /* 602 * Show an option if 603 * - it's set to a non-default value OR 604 * - if the per-sb default is different from the global default 605 */ 606 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs) 607 { 608 struct super_block *sb = vfs->mnt_sb; 609 struct ext4_sb_info *sbi = EXT4_SB(sb); 610 struct ext4_super_block *es = sbi->s_es; 611 unsigned long def_mount_opts; 612 613 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 614 615 if (sbi->s_sb_block != 1) 616 seq_printf(seq, ",sb=%llu", sbi->s_sb_block); 617 if (test_opt(sb, MINIX_DF)) 618 seq_puts(seq, ",minixdf"); 619 if (test_opt(sb, GRPID)) 620 seq_puts(seq, ",grpid"); 621 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS)) 622 seq_puts(seq, ",nogrpid"); 623 if (sbi->s_resuid != EXT4_DEF_RESUID || 624 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) { 625 seq_printf(seq, ",resuid=%u", sbi->s_resuid); 626 } 627 if (sbi->s_resgid != EXT4_DEF_RESGID || 628 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) { 629 seq_printf(seq, ",resgid=%u", sbi->s_resgid); 630 } 631 if (test_opt(sb, ERRORS_CONT)) { 632 int def_errors = le16_to_cpu(es->s_errors); 633 634 if (def_errors == EXT4_ERRORS_PANIC || 635 def_errors == EXT4_ERRORS_RO) { 636 seq_puts(seq, ",errors=continue"); 637 } 638 } 639 if (test_opt(sb, ERRORS_RO)) 640 seq_puts(seq, ",errors=remount-ro"); 641 if (test_opt(sb, ERRORS_PANIC)) 642 seq_puts(seq, ",errors=panic"); 643 if (test_opt(sb, NO_UID32)) 644 seq_puts(seq, ",nouid32"); 645 if (test_opt(sb, DEBUG)) 646 seq_puts(seq, ",debug"); 647 if (test_opt(sb, OLDALLOC)) 648 seq_puts(seq, ",oldalloc"); 649 #ifdef CONFIG_EXT4_FS_XATTR 650 if (test_opt(sb, XATTR_USER)) 651 seq_puts(seq, ",user_xattr"); 652 if (!test_opt(sb, XATTR_USER) && 653 (def_mount_opts & EXT4_DEFM_XATTR_USER)) { 654 seq_puts(seq, ",nouser_xattr"); 655 } 656 #endif 657 #ifdef CONFIG_EXT4_FS_POSIX_ACL 658 if (test_opt(sb, POSIX_ACL)) 659 seq_puts(seq, ",acl"); 660 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL)) 661 seq_puts(seq, ",noacl"); 662 #endif 663 if (!test_opt(sb, RESERVATION)) 664 seq_puts(seq, ",noreservation"); 665 if (sbi->s_commit_interval) { 666 seq_printf(seq, ",commit=%u", 667 (unsigned) (sbi->s_commit_interval / HZ)); 668 } 669 if (test_opt(sb, BARRIER)) 670 seq_puts(seq, ",barrier=1"); 671 if (test_opt(sb, NOBH)) 672 seq_puts(seq, ",nobh"); 673 if (!test_opt(sb, EXTENTS)) 674 seq_puts(seq, ",noextents"); 675 676 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) 677 seq_puts(seq, ",data=journal"); 678 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) 679 seq_puts(seq, ",data=ordered"); 680 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) 681 seq_puts(seq, ",data=writeback"); 682 683 ext4_show_quota_options(seq, sb); 684 685 return 0; 686 } 687 688 689 static struct inode *ext4_nfs_get_inode(struct super_block *sb, 690 u64 ino, u32 generation) 691 { 692 struct inode *inode; 693 694 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) 695 return ERR_PTR(-ESTALE); 696 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) 697 return ERR_PTR(-ESTALE); 698 699 /* iget isn't really right if the inode is currently unallocated!! 700 * 701 * ext4_read_inode will return a bad_inode if the inode had been 702 * deleted, so we should be safe. 703 * 704 * Currently we don't know the generation for parent directory, so 705 * a generation of 0 means "accept any" 706 */ 707 inode = iget(sb, ino); 708 if (inode == NULL) 709 return ERR_PTR(-ENOMEM); 710 if (is_bad_inode(inode) || 711 (generation && inode->i_generation != generation)) { 712 iput(inode); 713 return ERR_PTR(-ESTALE); 714 } 715 716 return inode; 717 } 718 719 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, 720 int fh_len, int fh_type) 721 { 722 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 723 ext4_nfs_get_inode); 724 } 725 726 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, 727 int fh_len, int fh_type) 728 { 729 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 730 ext4_nfs_get_inode); 731 } 732 733 #ifdef CONFIG_QUOTA 734 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group") 735 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) 736 737 static int ext4_dquot_initialize(struct inode *inode, int type); 738 static int ext4_dquot_drop(struct inode *inode); 739 static int ext4_write_dquot(struct dquot *dquot); 740 static int ext4_acquire_dquot(struct dquot *dquot); 741 static int ext4_release_dquot(struct dquot *dquot); 742 static int ext4_mark_dquot_dirty(struct dquot *dquot); 743 static int ext4_write_info(struct super_block *sb, int type); 744 static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path); 745 static int ext4_quota_on_mount(struct super_block *sb, int type); 746 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 747 size_t len, loff_t off); 748 static ssize_t ext4_quota_write(struct super_block *sb, int type, 749 const char *data, size_t len, loff_t off); 750 751 static struct dquot_operations ext4_quota_operations = { 752 .initialize = ext4_dquot_initialize, 753 .drop = ext4_dquot_drop, 754 .alloc_space = dquot_alloc_space, 755 .alloc_inode = dquot_alloc_inode, 756 .free_space = dquot_free_space, 757 .free_inode = dquot_free_inode, 758 .transfer = dquot_transfer, 759 .write_dquot = ext4_write_dquot, 760 .acquire_dquot = ext4_acquire_dquot, 761 .release_dquot = ext4_release_dquot, 762 .mark_dirty = ext4_mark_dquot_dirty, 763 .write_info = ext4_write_info 764 }; 765 766 static struct quotactl_ops ext4_qctl_operations = { 767 .quota_on = ext4_quota_on, 768 .quota_off = vfs_quota_off, 769 .quota_sync = vfs_quota_sync, 770 .get_info = vfs_get_dqinfo, 771 .set_info = vfs_set_dqinfo, 772 .get_dqblk = vfs_get_dqblk, 773 .set_dqblk = vfs_set_dqblk 774 }; 775 #endif 776 777 static const struct super_operations ext4_sops = { 778 .alloc_inode = ext4_alloc_inode, 779 .destroy_inode = ext4_destroy_inode, 780 .read_inode = ext4_read_inode, 781 .write_inode = ext4_write_inode, 782 .dirty_inode = ext4_dirty_inode, 783 .delete_inode = ext4_delete_inode, 784 .put_super = ext4_put_super, 785 .write_super = ext4_write_super, 786 .sync_fs = ext4_sync_fs, 787 .write_super_lockfs = ext4_write_super_lockfs, 788 .unlockfs = ext4_unlockfs, 789 .statfs = ext4_statfs, 790 .remount_fs = ext4_remount, 791 .clear_inode = ext4_clear_inode, 792 .show_options = ext4_show_options, 793 #ifdef CONFIG_QUOTA 794 .quota_read = ext4_quota_read, 795 .quota_write = ext4_quota_write, 796 #endif 797 }; 798 799 static const struct export_operations ext4_export_ops = { 800 .fh_to_dentry = ext4_fh_to_dentry, 801 .fh_to_parent = ext4_fh_to_parent, 802 .get_parent = ext4_get_parent, 803 }; 804 805 enum { 806 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 807 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, 808 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov, 809 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, 810 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh, 811 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev, 812 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, 813 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, 814 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota, 815 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota, 816 Opt_grpquota, Opt_extents, Opt_noextents, 817 }; 818 819 static match_table_t tokens = { 820 {Opt_bsd_df, "bsddf"}, 821 {Opt_minix_df, "minixdf"}, 822 {Opt_grpid, "grpid"}, 823 {Opt_grpid, "bsdgroups"}, 824 {Opt_nogrpid, "nogrpid"}, 825 {Opt_nogrpid, "sysvgroups"}, 826 {Opt_resgid, "resgid=%u"}, 827 {Opt_resuid, "resuid=%u"}, 828 {Opt_sb, "sb=%u"}, 829 {Opt_err_cont, "errors=continue"}, 830 {Opt_err_panic, "errors=panic"}, 831 {Opt_err_ro, "errors=remount-ro"}, 832 {Opt_nouid32, "nouid32"}, 833 {Opt_nocheck, "nocheck"}, 834 {Opt_nocheck, "check=none"}, 835 {Opt_debug, "debug"}, 836 {Opt_oldalloc, "oldalloc"}, 837 {Opt_orlov, "orlov"}, 838 {Opt_user_xattr, "user_xattr"}, 839 {Opt_nouser_xattr, "nouser_xattr"}, 840 {Opt_acl, "acl"}, 841 {Opt_noacl, "noacl"}, 842 {Opt_reservation, "reservation"}, 843 {Opt_noreservation, "noreservation"}, 844 {Opt_noload, "noload"}, 845 {Opt_nobh, "nobh"}, 846 {Opt_bh, "bh"}, 847 {Opt_commit, "commit=%u"}, 848 {Opt_journal_update, "journal=update"}, 849 {Opt_journal_inum, "journal=%u"}, 850 {Opt_journal_dev, "journal_dev=%u"}, 851 {Opt_abort, "abort"}, 852 {Opt_data_journal, "data=journal"}, 853 {Opt_data_ordered, "data=ordered"}, 854 {Opt_data_writeback, "data=writeback"}, 855 {Opt_offusrjquota, "usrjquota="}, 856 {Opt_usrjquota, "usrjquota=%s"}, 857 {Opt_offgrpjquota, "grpjquota="}, 858 {Opt_grpjquota, "grpjquota=%s"}, 859 {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, 860 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, 861 {Opt_grpquota, "grpquota"}, 862 {Opt_noquota, "noquota"}, 863 {Opt_quota, "quota"}, 864 {Opt_usrquota, "usrquota"}, 865 {Opt_barrier, "barrier=%u"}, 866 {Opt_extents, "extents"}, 867 {Opt_noextents, "noextents"}, 868 {Opt_err, NULL}, 869 {Opt_resize, "resize"}, 870 }; 871 872 static ext4_fsblk_t get_sb_block(void **data) 873 { 874 ext4_fsblk_t sb_block; 875 char *options = (char *) *data; 876 877 if (!options || strncmp(options, "sb=", 3) != 0) 878 return 1; /* Default location */ 879 options += 3; 880 /*todo: use simple_strtoll with >32bit ext4 */ 881 sb_block = simple_strtoul(options, &options, 0); 882 if (*options && *options != ',') { 883 printk("EXT4-fs: Invalid sb specification: %s\n", 884 (char *) *data); 885 return 1; 886 } 887 if (*options == ',') 888 options++; 889 *data = (void *) options; 890 return sb_block; 891 } 892 893 static int parse_options (char *options, struct super_block *sb, 894 unsigned int *inum, unsigned long *journal_devnum, 895 ext4_fsblk_t *n_blocks_count, int is_remount) 896 { 897 struct ext4_sb_info *sbi = EXT4_SB(sb); 898 char * p; 899 substring_t args[MAX_OPT_ARGS]; 900 int data_opt = 0; 901 int option; 902 #ifdef CONFIG_QUOTA 903 int qtype; 904 char *qname; 905 #endif 906 907 if (!options) 908 return 1; 909 910 while ((p = strsep (&options, ",")) != NULL) { 911 int token; 912 if (!*p) 913 continue; 914 915 token = match_token(p, tokens, args); 916 switch (token) { 917 case Opt_bsd_df: 918 clear_opt (sbi->s_mount_opt, MINIX_DF); 919 break; 920 case Opt_minix_df: 921 set_opt (sbi->s_mount_opt, MINIX_DF); 922 break; 923 case Opt_grpid: 924 set_opt (sbi->s_mount_opt, GRPID); 925 break; 926 case Opt_nogrpid: 927 clear_opt (sbi->s_mount_opt, GRPID); 928 break; 929 case Opt_resuid: 930 if (match_int(&args[0], &option)) 931 return 0; 932 sbi->s_resuid = option; 933 break; 934 case Opt_resgid: 935 if (match_int(&args[0], &option)) 936 return 0; 937 sbi->s_resgid = option; 938 break; 939 case Opt_sb: 940 /* handled by get_sb_block() instead of here */ 941 /* *sb_block = match_int(&args[0]); */ 942 break; 943 case Opt_err_panic: 944 clear_opt (sbi->s_mount_opt, ERRORS_CONT); 945 clear_opt (sbi->s_mount_opt, ERRORS_RO); 946 set_opt (sbi->s_mount_opt, ERRORS_PANIC); 947 break; 948 case Opt_err_ro: 949 clear_opt (sbi->s_mount_opt, ERRORS_CONT); 950 clear_opt (sbi->s_mount_opt, ERRORS_PANIC); 951 set_opt (sbi->s_mount_opt, ERRORS_RO); 952 break; 953 case Opt_err_cont: 954 clear_opt (sbi->s_mount_opt, ERRORS_RO); 955 clear_opt (sbi->s_mount_opt, ERRORS_PANIC); 956 set_opt (sbi->s_mount_opt, ERRORS_CONT); 957 break; 958 case Opt_nouid32: 959 set_opt (sbi->s_mount_opt, NO_UID32); 960 break; 961 case Opt_nocheck: 962 clear_opt (sbi->s_mount_opt, CHECK); 963 break; 964 case Opt_debug: 965 set_opt (sbi->s_mount_opt, DEBUG); 966 break; 967 case Opt_oldalloc: 968 set_opt (sbi->s_mount_opt, OLDALLOC); 969 break; 970 case Opt_orlov: 971 clear_opt (sbi->s_mount_opt, OLDALLOC); 972 break; 973 #ifdef CONFIG_EXT4DEV_FS_XATTR 974 case Opt_user_xattr: 975 set_opt (sbi->s_mount_opt, XATTR_USER); 976 break; 977 case Opt_nouser_xattr: 978 clear_opt (sbi->s_mount_opt, XATTR_USER); 979 break; 980 #else 981 case Opt_user_xattr: 982 case Opt_nouser_xattr: 983 printk("EXT4 (no)user_xattr options not supported\n"); 984 break; 985 #endif 986 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 987 case Opt_acl: 988 set_opt(sbi->s_mount_opt, POSIX_ACL); 989 break; 990 case Opt_noacl: 991 clear_opt(sbi->s_mount_opt, POSIX_ACL); 992 break; 993 #else 994 case Opt_acl: 995 case Opt_noacl: 996 printk("EXT4 (no)acl options not supported\n"); 997 break; 998 #endif 999 case Opt_reservation: 1000 set_opt(sbi->s_mount_opt, RESERVATION); 1001 break; 1002 case Opt_noreservation: 1003 clear_opt(sbi->s_mount_opt, RESERVATION); 1004 break; 1005 case Opt_journal_update: 1006 /* @@@ FIXME */ 1007 /* Eventually we will want to be able to create 1008 a journal file here. For now, only allow the 1009 user to specify an existing inode to be the 1010 journal file. */ 1011 if (is_remount) { 1012 printk(KERN_ERR "EXT4-fs: cannot specify " 1013 "journal on remount\n"); 1014 return 0; 1015 } 1016 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL); 1017 break; 1018 case Opt_journal_inum: 1019 if (is_remount) { 1020 printk(KERN_ERR "EXT4-fs: cannot specify " 1021 "journal on remount\n"); 1022 return 0; 1023 } 1024 if (match_int(&args[0], &option)) 1025 return 0; 1026 *inum = option; 1027 break; 1028 case Opt_journal_dev: 1029 if (is_remount) { 1030 printk(KERN_ERR "EXT4-fs: cannot specify " 1031 "journal on remount\n"); 1032 return 0; 1033 } 1034 if (match_int(&args[0], &option)) 1035 return 0; 1036 *journal_devnum = option; 1037 break; 1038 case Opt_noload: 1039 set_opt (sbi->s_mount_opt, NOLOAD); 1040 break; 1041 case Opt_commit: 1042 if (match_int(&args[0], &option)) 1043 return 0; 1044 if (option < 0) 1045 return 0; 1046 if (option == 0) 1047 option = JBD2_DEFAULT_MAX_COMMIT_AGE; 1048 sbi->s_commit_interval = HZ * option; 1049 break; 1050 case Opt_data_journal: 1051 data_opt = EXT4_MOUNT_JOURNAL_DATA; 1052 goto datacheck; 1053 case Opt_data_ordered: 1054 data_opt = EXT4_MOUNT_ORDERED_DATA; 1055 goto datacheck; 1056 case Opt_data_writeback: 1057 data_opt = EXT4_MOUNT_WRITEBACK_DATA; 1058 datacheck: 1059 if (is_remount) { 1060 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS) 1061 != data_opt) { 1062 printk(KERN_ERR 1063 "EXT4-fs: cannot change data " 1064 "mode on remount\n"); 1065 return 0; 1066 } 1067 } else { 1068 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS; 1069 sbi->s_mount_opt |= data_opt; 1070 } 1071 break; 1072 #ifdef CONFIG_QUOTA 1073 case Opt_usrjquota: 1074 qtype = USRQUOTA; 1075 goto set_qf_name; 1076 case Opt_grpjquota: 1077 qtype = GRPQUOTA; 1078 set_qf_name: 1079 if (sb_any_quota_enabled(sb)) { 1080 printk(KERN_ERR 1081 "EXT4-fs: Cannot change journalled " 1082 "quota options when quota turned on.\n"); 1083 return 0; 1084 } 1085 qname = match_strdup(&args[0]); 1086 if (!qname) { 1087 printk(KERN_ERR 1088 "EXT4-fs: not enough memory for " 1089 "storing quotafile name.\n"); 1090 return 0; 1091 } 1092 if (sbi->s_qf_names[qtype] && 1093 strcmp(sbi->s_qf_names[qtype], qname)) { 1094 printk(KERN_ERR 1095 "EXT4-fs: %s quota file already " 1096 "specified.\n", QTYPE2NAME(qtype)); 1097 kfree(qname); 1098 return 0; 1099 } 1100 sbi->s_qf_names[qtype] = qname; 1101 if (strchr(sbi->s_qf_names[qtype], '/')) { 1102 printk(KERN_ERR 1103 "EXT4-fs: quotafile must be on " 1104 "filesystem root.\n"); 1105 kfree(sbi->s_qf_names[qtype]); 1106 sbi->s_qf_names[qtype] = NULL; 1107 return 0; 1108 } 1109 set_opt(sbi->s_mount_opt, QUOTA); 1110 break; 1111 case Opt_offusrjquota: 1112 qtype = USRQUOTA; 1113 goto clear_qf_name; 1114 case Opt_offgrpjquota: 1115 qtype = GRPQUOTA; 1116 clear_qf_name: 1117 if (sb_any_quota_enabled(sb)) { 1118 printk(KERN_ERR "EXT4-fs: Cannot change " 1119 "journalled quota options when " 1120 "quota turned on.\n"); 1121 return 0; 1122 } 1123 /* 1124 * The space will be released later when all options 1125 * are confirmed to be correct 1126 */ 1127 sbi->s_qf_names[qtype] = NULL; 1128 break; 1129 case Opt_jqfmt_vfsold: 1130 sbi->s_jquota_fmt = QFMT_VFS_OLD; 1131 break; 1132 case Opt_jqfmt_vfsv0: 1133 sbi->s_jquota_fmt = QFMT_VFS_V0; 1134 break; 1135 case Opt_quota: 1136 case Opt_usrquota: 1137 set_opt(sbi->s_mount_opt, QUOTA); 1138 set_opt(sbi->s_mount_opt, USRQUOTA); 1139 break; 1140 case Opt_grpquota: 1141 set_opt(sbi->s_mount_opt, QUOTA); 1142 set_opt(sbi->s_mount_opt, GRPQUOTA); 1143 break; 1144 case Opt_noquota: 1145 if (sb_any_quota_enabled(sb)) { 1146 printk(KERN_ERR "EXT4-fs: Cannot change quota " 1147 "options when quota turned on.\n"); 1148 return 0; 1149 } 1150 clear_opt(sbi->s_mount_opt, QUOTA); 1151 clear_opt(sbi->s_mount_opt, USRQUOTA); 1152 clear_opt(sbi->s_mount_opt, GRPQUOTA); 1153 break; 1154 #else 1155 case Opt_quota: 1156 case Opt_usrquota: 1157 case Opt_grpquota: 1158 case Opt_usrjquota: 1159 case Opt_grpjquota: 1160 case Opt_offusrjquota: 1161 case Opt_offgrpjquota: 1162 case Opt_jqfmt_vfsold: 1163 case Opt_jqfmt_vfsv0: 1164 printk(KERN_ERR 1165 "EXT4-fs: journalled quota options not " 1166 "supported.\n"); 1167 break; 1168 case Opt_noquota: 1169 break; 1170 #endif 1171 case Opt_abort: 1172 set_opt(sbi->s_mount_opt, ABORT); 1173 break; 1174 case Opt_barrier: 1175 if (match_int(&args[0], &option)) 1176 return 0; 1177 if (option) 1178 set_opt(sbi->s_mount_opt, BARRIER); 1179 else 1180 clear_opt(sbi->s_mount_opt, BARRIER); 1181 break; 1182 case Opt_ignore: 1183 break; 1184 case Opt_resize: 1185 if (!is_remount) { 1186 printk("EXT4-fs: resize option only available " 1187 "for remount\n"); 1188 return 0; 1189 } 1190 if (match_int(&args[0], &option) != 0) 1191 return 0; 1192 *n_blocks_count = option; 1193 break; 1194 case Opt_nobh: 1195 set_opt(sbi->s_mount_opt, NOBH); 1196 break; 1197 case Opt_bh: 1198 clear_opt(sbi->s_mount_opt, NOBH); 1199 break; 1200 case Opt_extents: 1201 set_opt (sbi->s_mount_opt, EXTENTS); 1202 break; 1203 case Opt_noextents: 1204 clear_opt (sbi->s_mount_opt, EXTENTS); 1205 break; 1206 default: 1207 printk (KERN_ERR 1208 "EXT4-fs: Unrecognized mount option \"%s\" " 1209 "or missing value\n", p); 1210 return 0; 1211 } 1212 } 1213 #ifdef CONFIG_QUOTA 1214 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { 1215 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) && 1216 sbi->s_qf_names[USRQUOTA]) 1217 clear_opt(sbi->s_mount_opt, USRQUOTA); 1218 1219 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) && 1220 sbi->s_qf_names[GRPQUOTA]) 1221 clear_opt(sbi->s_mount_opt, GRPQUOTA); 1222 1223 if ((sbi->s_qf_names[USRQUOTA] && 1224 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) || 1225 (sbi->s_qf_names[GRPQUOTA] && 1226 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) { 1227 printk(KERN_ERR "EXT4-fs: old and new quota " 1228 "format mixing.\n"); 1229 return 0; 1230 } 1231 1232 if (!sbi->s_jquota_fmt) { 1233 printk(KERN_ERR "EXT4-fs: journalled quota format " 1234 "not specified.\n"); 1235 return 0; 1236 } 1237 } else { 1238 if (sbi->s_jquota_fmt) { 1239 printk(KERN_ERR "EXT4-fs: journalled quota format " 1240 "specified with no journalling " 1241 "enabled.\n"); 1242 return 0; 1243 } 1244 } 1245 #endif 1246 return 1; 1247 } 1248 1249 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, 1250 int read_only) 1251 { 1252 struct ext4_sb_info *sbi = EXT4_SB(sb); 1253 int res = 0; 1254 1255 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { 1256 printk (KERN_ERR "EXT4-fs warning: revision level too high, " 1257 "forcing read-only mode\n"); 1258 res = MS_RDONLY; 1259 } 1260 if (read_only) 1261 return res; 1262 if (!(sbi->s_mount_state & EXT4_VALID_FS)) 1263 printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, " 1264 "running e2fsck is recommended\n"); 1265 else if ((sbi->s_mount_state & EXT4_ERROR_FS)) 1266 printk (KERN_WARNING 1267 "EXT4-fs warning: mounting fs with errors, " 1268 "running e2fsck is recommended\n"); 1269 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 1270 le16_to_cpu(es->s_mnt_count) >= 1271 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 1272 printk (KERN_WARNING 1273 "EXT4-fs warning: maximal mount count reached, " 1274 "running e2fsck is recommended\n"); 1275 else if (le32_to_cpu(es->s_checkinterval) && 1276 (le32_to_cpu(es->s_lastcheck) + 1277 le32_to_cpu(es->s_checkinterval) <= get_seconds())) 1278 printk (KERN_WARNING 1279 "EXT4-fs warning: checktime reached, " 1280 "running e2fsck is recommended\n"); 1281 #if 0 1282 /* @@@ We _will_ want to clear the valid bit if we find 1283 * inconsistencies, to force a fsck at reboot. But for 1284 * a plain journaled filesystem we can keep it set as 1285 * valid forever! :) 1286 */ 1287 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS); 1288 #endif 1289 if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) 1290 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); 1291 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1); 1292 es->s_mtime = cpu_to_le32(get_seconds()); 1293 ext4_update_dynamic_rev(sb); 1294 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 1295 1296 ext4_commit_super(sb, es, 1); 1297 if (test_opt(sb, DEBUG)) 1298 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, " 1299 "bpg=%lu, ipg=%lu, mo=%04lx]\n", 1300 sb->s_blocksize, 1301 sbi->s_groups_count, 1302 EXT4_BLOCKS_PER_GROUP(sb), 1303 EXT4_INODES_PER_GROUP(sb), 1304 sbi->s_mount_opt); 1305 1306 printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id); 1307 if (EXT4_SB(sb)->s_journal->j_inode == NULL) { 1308 char b[BDEVNAME_SIZE]; 1309 1310 printk("external journal on %s\n", 1311 bdevname(EXT4_SB(sb)->s_journal->j_dev, b)); 1312 } else { 1313 printk("internal journal\n"); 1314 } 1315 return res; 1316 } 1317 1318 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group, 1319 struct ext4_group_desc *gdp) 1320 { 1321 __u16 crc = 0; 1322 1323 if (sbi->s_es->s_feature_ro_compat & 1324 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { 1325 int offset = offsetof(struct ext4_group_desc, bg_checksum); 1326 __le32 le_group = cpu_to_le32(block_group); 1327 1328 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); 1329 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); 1330 crc = crc16(crc, (__u8 *)gdp, offset); 1331 offset += sizeof(gdp->bg_checksum); /* skip checksum */ 1332 /* for checksum of struct ext4_group_desc do the rest...*/ 1333 if ((sbi->s_es->s_feature_incompat & 1334 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) && 1335 offset < le16_to_cpu(sbi->s_es->s_desc_size)) 1336 crc = crc16(crc, (__u8 *)gdp + offset, 1337 le16_to_cpu(sbi->s_es->s_desc_size) - 1338 offset); 1339 } 1340 1341 return cpu_to_le16(crc); 1342 } 1343 1344 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group, 1345 struct ext4_group_desc *gdp) 1346 { 1347 if ((sbi->s_es->s_feature_ro_compat & 1348 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) && 1349 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp))) 1350 return 0; 1351 1352 return 1; 1353 } 1354 1355 /* Called at mount-time, super-block is locked */ 1356 static int ext4_check_descriptors (struct super_block * sb) 1357 { 1358 struct ext4_sb_info *sbi = EXT4_SB(sb); 1359 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); 1360 ext4_fsblk_t last_block; 1361 ext4_fsblk_t block_bitmap; 1362 ext4_fsblk_t inode_bitmap; 1363 ext4_fsblk_t inode_table; 1364 struct ext4_group_desc * gdp = NULL; 1365 int desc_block = 0; 1366 int flexbg_flag = 0; 1367 ext4_group_t i; 1368 1369 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 1370 flexbg_flag = 1; 1371 1372 ext4_debug ("Checking group descriptors"); 1373 1374 for (i = 0; i < sbi->s_groups_count; i++) 1375 { 1376 if (i == sbi->s_groups_count - 1 || flexbg_flag) 1377 last_block = ext4_blocks_count(sbi->s_es) - 1; 1378 else 1379 last_block = first_block + 1380 (EXT4_BLOCKS_PER_GROUP(sb) - 1); 1381 1382 if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0) 1383 gdp = (struct ext4_group_desc *) 1384 sbi->s_group_desc[desc_block++]->b_data; 1385 block_bitmap = ext4_block_bitmap(sb, gdp); 1386 if (block_bitmap < first_block || block_bitmap > last_block) 1387 { 1388 ext4_error (sb, "ext4_check_descriptors", 1389 "Block bitmap for group %lu" 1390 " not in group (block %llu)!", 1391 i, block_bitmap); 1392 return 0; 1393 } 1394 inode_bitmap = ext4_inode_bitmap(sb, gdp); 1395 if (inode_bitmap < first_block || inode_bitmap > last_block) 1396 { 1397 ext4_error (sb, "ext4_check_descriptors", 1398 "Inode bitmap for group %lu" 1399 " not in group (block %llu)!", 1400 i, inode_bitmap); 1401 return 0; 1402 } 1403 inode_table = ext4_inode_table(sb, gdp); 1404 if (inode_table < first_block || 1405 inode_table + sbi->s_itb_per_group - 1 > last_block) 1406 { 1407 ext4_error (sb, "ext4_check_descriptors", 1408 "Inode table for group %lu" 1409 " not in group (block %llu)!", 1410 i, inode_table); 1411 return 0; 1412 } 1413 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) { 1414 ext4_error(sb, __FUNCTION__, 1415 "Checksum for group %lu failed (%u!=%u)\n", 1416 i, le16_to_cpu(ext4_group_desc_csum(sbi, i, 1417 gdp)), le16_to_cpu(gdp->bg_checksum)); 1418 return 0; 1419 } 1420 if (!flexbg_flag) 1421 first_block += EXT4_BLOCKS_PER_GROUP(sb); 1422 gdp = (struct ext4_group_desc *) 1423 ((__u8 *)gdp + EXT4_DESC_SIZE(sb)); 1424 } 1425 1426 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb)); 1427 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb)); 1428 return 1; 1429 } 1430 1431 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at 1432 * the superblock) which were deleted from all directories, but held open by 1433 * a process at the time of a crash. We walk the list and try to delete these 1434 * inodes at recovery time (only with a read-write filesystem). 1435 * 1436 * In order to keep the orphan inode chain consistent during traversal (in 1437 * case of crash during recovery), we link each inode into the superblock 1438 * orphan list_head and handle it the same way as an inode deletion during 1439 * normal operation (which journals the operations for us). 1440 * 1441 * We only do an iget() and an iput() on each inode, which is very safe if we 1442 * accidentally point at an in-use or already deleted inode. The worst that 1443 * can happen in this case is that we get a "bit already cleared" message from 1444 * ext4_free_inode(). The only reason we would point at a wrong inode is if 1445 * e2fsck was run on this filesystem, and it must have already done the orphan 1446 * inode cleanup for us, so we can safely abort without any further action. 1447 */ 1448 static void ext4_orphan_cleanup (struct super_block * sb, 1449 struct ext4_super_block * es) 1450 { 1451 unsigned int s_flags = sb->s_flags; 1452 int nr_orphans = 0, nr_truncates = 0; 1453 #ifdef CONFIG_QUOTA 1454 int i; 1455 #endif 1456 if (!es->s_last_orphan) { 1457 jbd_debug(4, "no orphan inodes to clean up\n"); 1458 return; 1459 } 1460 1461 if (bdev_read_only(sb->s_bdev)) { 1462 printk(KERN_ERR "EXT4-fs: write access " 1463 "unavailable, skipping orphan cleanup.\n"); 1464 return; 1465 } 1466 1467 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { 1468 if (es->s_last_orphan) 1469 jbd_debug(1, "Errors on filesystem, " 1470 "clearing orphan list.\n"); 1471 es->s_last_orphan = 0; 1472 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); 1473 return; 1474 } 1475 1476 if (s_flags & MS_RDONLY) { 1477 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n", 1478 sb->s_id); 1479 sb->s_flags &= ~MS_RDONLY; 1480 } 1481 #ifdef CONFIG_QUOTA 1482 /* Needed for iput() to work correctly and not trash data */ 1483 sb->s_flags |= MS_ACTIVE; 1484 /* Turn on quotas so that they are updated correctly */ 1485 for (i = 0; i < MAXQUOTAS; i++) { 1486 if (EXT4_SB(sb)->s_qf_names[i]) { 1487 int ret = ext4_quota_on_mount(sb, i); 1488 if (ret < 0) 1489 printk(KERN_ERR 1490 "EXT4-fs: Cannot turn on journalled " 1491 "quota: error %d\n", ret); 1492 } 1493 } 1494 #endif 1495 1496 while (es->s_last_orphan) { 1497 struct inode *inode; 1498 1499 if (!(inode = 1500 ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) { 1501 es->s_last_orphan = 0; 1502 break; 1503 } 1504 1505 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); 1506 DQUOT_INIT(inode); 1507 if (inode->i_nlink) { 1508 printk(KERN_DEBUG 1509 "%s: truncating inode %lu to %Ld bytes\n", 1510 __FUNCTION__, inode->i_ino, inode->i_size); 1511 jbd_debug(2, "truncating inode %lu to %Ld bytes\n", 1512 inode->i_ino, inode->i_size); 1513 ext4_truncate(inode); 1514 nr_truncates++; 1515 } else { 1516 printk(KERN_DEBUG 1517 "%s: deleting unreferenced inode %lu\n", 1518 __FUNCTION__, inode->i_ino); 1519 jbd_debug(2, "deleting unreferenced inode %lu\n", 1520 inode->i_ino); 1521 nr_orphans++; 1522 } 1523 iput(inode); /* The delete magic happens here! */ 1524 } 1525 1526 #define PLURAL(x) (x), ((x)==1) ? "" : "s" 1527 1528 if (nr_orphans) 1529 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n", 1530 sb->s_id, PLURAL(nr_orphans)); 1531 if (nr_truncates) 1532 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n", 1533 sb->s_id, PLURAL(nr_truncates)); 1534 #ifdef CONFIG_QUOTA 1535 /* Turn quotas off */ 1536 for (i = 0; i < MAXQUOTAS; i++) { 1537 if (sb_dqopt(sb)->files[i]) 1538 vfs_quota_off(sb, i); 1539 } 1540 #endif 1541 sb->s_flags = s_flags; /* Restore MS_RDONLY status */ 1542 } 1543 1544 /* 1545 * Maximal file size. There is a direct, and {,double-,triple-}indirect 1546 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. 1547 * We need to be 1 filesystem block less than the 2^32 sector limit. 1548 */ 1549 static loff_t ext4_max_size(int bits) 1550 { 1551 loff_t res = EXT4_NDIR_BLOCKS; 1552 /* This constant is calculated to be the largest file size for a 1553 * dense, 4k-blocksize file such that the total number of 1554 * sectors in the file, including data and all indirect blocks, 1555 * does not exceed 2^32. */ 1556 const loff_t upper_limit = 0x1ff7fffd000LL; 1557 1558 res += 1LL << (bits-2); 1559 res += 1LL << (2*(bits-2)); 1560 res += 1LL << (3*(bits-2)); 1561 res <<= bits; 1562 if (res > upper_limit) 1563 res = upper_limit; 1564 return res; 1565 } 1566 1567 static ext4_fsblk_t descriptor_loc(struct super_block *sb, 1568 ext4_fsblk_t logical_sb_block, int nr) 1569 { 1570 struct ext4_sb_info *sbi = EXT4_SB(sb); 1571 ext4_group_t bg, first_meta_bg; 1572 int has_super = 0; 1573 1574 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 1575 1576 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || 1577 nr < first_meta_bg) 1578 return logical_sb_block + nr + 1; 1579 bg = sbi->s_desc_per_block * nr; 1580 if (ext4_bg_has_super(sb, bg)) 1581 has_super = 1; 1582 return (has_super + ext4_group_first_block_no(sb, bg)); 1583 } 1584 1585 1586 static int ext4_fill_super (struct super_block *sb, void *data, int silent) 1587 { 1588 struct buffer_head * bh; 1589 struct ext4_super_block *es = NULL; 1590 struct ext4_sb_info *sbi; 1591 ext4_fsblk_t block; 1592 ext4_fsblk_t sb_block = get_sb_block(&data); 1593 ext4_fsblk_t logical_sb_block; 1594 unsigned long offset = 0; 1595 unsigned int journal_inum = 0; 1596 unsigned long journal_devnum = 0; 1597 unsigned long def_mount_opts; 1598 struct inode *root; 1599 int blocksize; 1600 int hblock; 1601 int db_count; 1602 int i; 1603 int needs_recovery; 1604 __le32 features; 1605 __u64 blocks_count; 1606 int err; 1607 1608 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 1609 if (!sbi) 1610 return -ENOMEM; 1611 sb->s_fs_info = sbi; 1612 sbi->s_mount_opt = 0; 1613 sbi->s_resuid = EXT4_DEF_RESUID; 1614 sbi->s_resgid = EXT4_DEF_RESGID; 1615 sbi->s_sb_block = sb_block; 1616 1617 unlock_kernel(); 1618 1619 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); 1620 if (!blocksize) { 1621 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n"); 1622 goto out_fail; 1623 } 1624 1625 if (!sb_set_blocksize(sb, blocksize)) { 1626 printk(KERN_ERR "EXT4-fs: bad blocksize %d.\n", blocksize); 1627 goto out_fail; 1628 } 1629 1630 /* 1631 * The ext4 superblock will not be buffer aligned for other than 1kB 1632 * block sizes. We need to calculate the offset from buffer start. 1633 */ 1634 if (blocksize != EXT4_MIN_BLOCK_SIZE) { 1635 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 1636 offset = do_div(logical_sb_block, blocksize); 1637 } else { 1638 logical_sb_block = sb_block; 1639 } 1640 1641 if (!(bh = sb_bread(sb, logical_sb_block))) { 1642 printk (KERN_ERR "EXT4-fs: unable to read superblock\n"); 1643 goto out_fail; 1644 } 1645 /* 1646 * Note: s_es must be initialized as soon as possible because 1647 * some ext4 macro-instructions depend on its value 1648 */ 1649 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 1650 sbi->s_es = es; 1651 sb->s_magic = le16_to_cpu(es->s_magic); 1652 if (sb->s_magic != EXT4_SUPER_MAGIC) 1653 goto cantfind_ext4; 1654 1655 /* Set defaults before we parse the mount options */ 1656 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 1657 if (def_mount_opts & EXT4_DEFM_DEBUG) 1658 set_opt(sbi->s_mount_opt, DEBUG); 1659 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) 1660 set_opt(sbi->s_mount_opt, GRPID); 1661 if (def_mount_opts & EXT4_DEFM_UID16) 1662 set_opt(sbi->s_mount_opt, NO_UID32); 1663 #ifdef CONFIG_EXT4DEV_FS_XATTR 1664 if (def_mount_opts & EXT4_DEFM_XATTR_USER) 1665 set_opt(sbi->s_mount_opt, XATTR_USER); 1666 #endif 1667 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 1668 if (def_mount_opts & EXT4_DEFM_ACL) 1669 set_opt(sbi->s_mount_opt, POSIX_ACL); 1670 #endif 1671 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) 1672 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA; 1673 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) 1674 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA; 1675 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) 1676 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA; 1677 1678 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) 1679 set_opt(sbi->s_mount_opt, ERRORS_PANIC); 1680 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_RO) 1681 set_opt(sbi->s_mount_opt, ERRORS_RO); 1682 else 1683 set_opt(sbi->s_mount_opt, ERRORS_CONT); 1684 1685 sbi->s_resuid = le16_to_cpu(es->s_def_resuid); 1686 sbi->s_resgid = le16_to_cpu(es->s_def_resgid); 1687 1688 set_opt(sbi->s_mount_opt, RESERVATION); 1689 1690 /* 1691 * turn on extents feature by default in ext4 filesystem 1692 * User -o noextents to turn it off 1693 */ 1694 set_opt(sbi->s_mount_opt, EXTENTS); 1695 1696 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum, 1697 NULL, 0)) 1698 goto failed_mount; 1699 1700 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 1701 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 1702 1703 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && 1704 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || 1705 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 1706 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) 1707 printk(KERN_WARNING 1708 "EXT4-fs warning: feature flags set on rev 0 fs, " 1709 "running e2fsck is recommended\n"); 1710 /* 1711 * Check feature flags regardless of the revision level, since we 1712 * previously didn't change the revision level when setting the flags, 1713 * so there is a chance incompat flags are set on a rev 0 filesystem. 1714 */ 1715 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP); 1716 if (features) { 1717 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of " 1718 "unsupported optional features (%x).\n", 1719 sb->s_id, le32_to_cpu(features)); 1720 goto failed_mount; 1721 } 1722 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP); 1723 if (!(sb->s_flags & MS_RDONLY) && features) { 1724 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of " 1725 "unsupported optional features (%x).\n", 1726 sb->s_id, le32_to_cpu(features)); 1727 goto failed_mount; 1728 } 1729 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); 1730 1731 if (blocksize < EXT4_MIN_BLOCK_SIZE || 1732 blocksize > EXT4_MAX_BLOCK_SIZE) { 1733 printk(KERN_ERR 1734 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n", 1735 blocksize, sb->s_id); 1736 goto failed_mount; 1737 } 1738 1739 hblock = bdev_hardsect_size(sb->s_bdev); 1740 if (sb->s_blocksize != blocksize) { 1741 /* 1742 * Make sure the blocksize for the filesystem is larger 1743 * than the hardware sectorsize for the machine. 1744 */ 1745 if (blocksize < hblock) { 1746 printk(KERN_ERR "EXT4-fs: blocksize %d too small for " 1747 "device blocksize %d.\n", blocksize, hblock); 1748 goto failed_mount; 1749 } 1750 1751 brelse (bh); 1752 sb_set_blocksize(sb, blocksize); 1753 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 1754 offset = do_div(logical_sb_block, blocksize); 1755 bh = sb_bread(sb, logical_sb_block); 1756 if (!bh) { 1757 printk(KERN_ERR 1758 "EXT4-fs: Can't read superblock on 2nd try.\n"); 1759 goto failed_mount; 1760 } 1761 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); 1762 sbi->s_es = es; 1763 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { 1764 printk (KERN_ERR 1765 "EXT4-fs: Magic mismatch, very weird !\n"); 1766 goto failed_mount; 1767 } 1768 } 1769 1770 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits); 1771 1772 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { 1773 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; 1774 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; 1775 } else { 1776 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 1777 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 1778 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || 1779 (!is_power_of_2(sbi->s_inode_size)) || 1780 (sbi->s_inode_size > blocksize)) { 1781 printk (KERN_ERR 1782 "EXT4-fs: unsupported inode size: %d\n", 1783 sbi->s_inode_size); 1784 goto failed_mount; 1785 } 1786 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) 1787 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); 1788 } 1789 sbi->s_desc_size = le16_to_cpu(es->s_desc_size); 1790 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { 1791 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || 1792 sbi->s_desc_size > EXT4_MAX_DESC_SIZE || 1793 !is_power_of_2(sbi->s_desc_size)) { 1794 printk(KERN_ERR 1795 "EXT4-fs: unsupported descriptor size %lu\n", 1796 sbi->s_desc_size); 1797 goto failed_mount; 1798 } 1799 } else 1800 sbi->s_desc_size = EXT4_MIN_DESC_SIZE; 1801 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 1802 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 1803 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0) 1804 goto cantfind_ext4; 1805 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); 1806 if (sbi->s_inodes_per_block == 0) 1807 goto cantfind_ext4; 1808 sbi->s_itb_per_group = sbi->s_inodes_per_group / 1809 sbi->s_inodes_per_block; 1810 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); 1811 sbi->s_sbh = bh; 1812 sbi->s_mount_state = le16_to_cpu(es->s_state); 1813 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); 1814 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); 1815 for (i=0; i < 4; i++) 1816 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); 1817 sbi->s_def_hash_version = es->s_def_hash_version; 1818 1819 if (sbi->s_blocks_per_group > blocksize * 8) { 1820 printk (KERN_ERR 1821 "EXT4-fs: #blocks per group too big: %lu\n", 1822 sbi->s_blocks_per_group); 1823 goto failed_mount; 1824 } 1825 if (sbi->s_inodes_per_group > blocksize * 8) { 1826 printk (KERN_ERR 1827 "EXT4-fs: #inodes per group too big: %lu\n", 1828 sbi->s_inodes_per_group); 1829 goto failed_mount; 1830 } 1831 1832 if (ext4_blocks_count(es) > 1833 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { 1834 printk(KERN_ERR "EXT4-fs: filesystem on %s:" 1835 " too large to mount safely\n", sb->s_id); 1836 if (sizeof(sector_t) < 8) 1837 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not " 1838 "enabled\n"); 1839 goto failed_mount; 1840 } 1841 1842 if (EXT4_BLOCKS_PER_GROUP(sb) == 0) 1843 goto cantfind_ext4; 1844 blocks_count = (ext4_blocks_count(es) - 1845 le32_to_cpu(es->s_first_data_block) + 1846 EXT4_BLOCKS_PER_GROUP(sb) - 1); 1847 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); 1848 sbi->s_groups_count = blocks_count; 1849 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / 1850 EXT4_DESC_PER_BLOCK(sb); 1851 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *), 1852 GFP_KERNEL); 1853 if (sbi->s_group_desc == NULL) { 1854 printk (KERN_ERR "EXT4-fs: not enough memory\n"); 1855 goto failed_mount; 1856 } 1857 1858 bgl_lock_init(&sbi->s_blockgroup_lock); 1859 1860 for (i = 0; i < db_count; i++) { 1861 block = descriptor_loc(sb, logical_sb_block, i); 1862 sbi->s_group_desc[i] = sb_bread(sb, block); 1863 if (!sbi->s_group_desc[i]) { 1864 printk (KERN_ERR "EXT4-fs: " 1865 "can't read group descriptor %d\n", i); 1866 db_count = i; 1867 goto failed_mount2; 1868 } 1869 } 1870 if (!ext4_check_descriptors (sb)) { 1871 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n"); 1872 goto failed_mount2; 1873 } 1874 sbi->s_gdb_count = db_count; 1875 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 1876 spin_lock_init(&sbi->s_next_gen_lock); 1877 1878 err = percpu_counter_init(&sbi->s_freeblocks_counter, 1879 ext4_count_free_blocks(sb)); 1880 if (!err) { 1881 err = percpu_counter_init(&sbi->s_freeinodes_counter, 1882 ext4_count_free_inodes(sb)); 1883 } 1884 if (!err) { 1885 err = percpu_counter_init(&sbi->s_dirs_counter, 1886 ext4_count_dirs(sb)); 1887 } 1888 if (err) { 1889 printk(KERN_ERR "EXT4-fs: insufficient memory\n"); 1890 goto failed_mount3; 1891 } 1892 1893 /* per fileystem reservation list head & lock */ 1894 spin_lock_init(&sbi->s_rsv_window_lock); 1895 sbi->s_rsv_window_root = RB_ROOT; 1896 /* Add a single, static dummy reservation to the start of the 1897 * reservation window list --- it gives us a placeholder for 1898 * append-at-start-of-list which makes the allocation logic 1899 * _much_ simpler. */ 1900 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; 1901 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; 1902 sbi->s_rsv_window_head.rsv_alloc_hit = 0; 1903 sbi->s_rsv_window_head.rsv_goal_size = 0; 1904 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head); 1905 1906 /* 1907 * set up enough so that it can read an inode 1908 */ 1909 sb->s_op = &ext4_sops; 1910 sb->s_export_op = &ext4_export_ops; 1911 sb->s_xattr = ext4_xattr_handlers; 1912 #ifdef CONFIG_QUOTA 1913 sb->s_qcop = &ext4_qctl_operations; 1914 sb->dq_op = &ext4_quota_operations; 1915 #endif 1916 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ 1917 1918 sb->s_root = NULL; 1919 1920 needs_recovery = (es->s_last_orphan != 0 || 1921 EXT4_HAS_INCOMPAT_FEATURE(sb, 1922 EXT4_FEATURE_INCOMPAT_RECOVER)); 1923 1924 /* 1925 * The first inode we look at is the journal inode. Don't try 1926 * root first: it may be modified in the journal! 1927 */ 1928 if (!test_opt(sb, NOLOAD) && 1929 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 1930 if (ext4_load_journal(sb, es, journal_devnum)) 1931 goto failed_mount3; 1932 } else if (journal_inum) { 1933 if (ext4_create_journal(sb, es, journal_inum)) 1934 goto failed_mount3; 1935 } else { 1936 if (!silent) 1937 printk (KERN_ERR 1938 "ext4: No journal on filesystem on %s\n", 1939 sb->s_id); 1940 goto failed_mount3; 1941 } 1942 1943 if (ext4_blocks_count(es) > 0xffffffffULL && 1944 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, 1945 JBD2_FEATURE_INCOMPAT_64BIT)) { 1946 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n"); 1947 goto failed_mount4; 1948 } 1949 1950 /* We have now updated the journal if required, so we can 1951 * validate the data journaling mode. */ 1952 switch (test_opt(sb, DATA_FLAGS)) { 1953 case 0: 1954 /* No mode set, assume a default based on the journal 1955 * capabilities: ORDERED_DATA if the journal can 1956 * cope, else JOURNAL_DATA 1957 */ 1958 if (jbd2_journal_check_available_features 1959 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) 1960 set_opt(sbi->s_mount_opt, ORDERED_DATA); 1961 else 1962 set_opt(sbi->s_mount_opt, JOURNAL_DATA); 1963 break; 1964 1965 case EXT4_MOUNT_ORDERED_DATA: 1966 case EXT4_MOUNT_WRITEBACK_DATA: 1967 if (!jbd2_journal_check_available_features 1968 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { 1969 printk(KERN_ERR "EXT4-fs: Journal does not support " 1970 "requested data journaling mode\n"); 1971 goto failed_mount4; 1972 } 1973 default: 1974 break; 1975 } 1976 1977 if (test_opt(sb, NOBH)) { 1978 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) { 1979 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - " 1980 "its supported only with writeback mode\n"); 1981 clear_opt(sbi->s_mount_opt, NOBH); 1982 } 1983 } 1984 /* 1985 * The jbd2_journal_load will have done any necessary log recovery, 1986 * so we can safely mount the rest of the filesystem now. 1987 */ 1988 1989 root = iget(sb, EXT4_ROOT_INO); 1990 sb->s_root = d_alloc_root(root); 1991 if (!sb->s_root) { 1992 printk(KERN_ERR "EXT4-fs: get root inode failed\n"); 1993 iput(root); 1994 goto failed_mount4; 1995 } 1996 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 1997 dput(sb->s_root); 1998 sb->s_root = NULL; 1999 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n"); 2000 goto failed_mount4; 2001 } 2002 2003 ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY); 2004 2005 /* determine the minimum size of new large inodes, if present */ 2006 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { 2007 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 2008 EXT4_GOOD_OLD_INODE_SIZE; 2009 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 2010 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { 2011 if (sbi->s_want_extra_isize < 2012 le16_to_cpu(es->s_want_extra_isize)) 2013 sbi->s_want_extra_isize = 2014 le16_to_cpu(es->s_want_extra_isize); 2015 if (sbi->s_want_extra_isize < 2016 le16_to_cpu(es->s_min_extra_isize)) 2017 sbi->s_want_extra_isize = 2018 le16_to_cpu(es->s_min_extra_isize); 2019 } 2020 } 2021 /* Check if enough inode space is available */ 2022 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > 2023 sbi->s_inode_size) { 2024 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 2025 EXT4_GOOD_OLD_INODE_SIZE; 2026 printk(KERN_INFO "EXT4-fs: required extra inode space not" 2027 "available.\n"); 2028 } 2029 2030 /* 2031 * akpm: core read_super() calls in here with the superblock locked. 2032 * That deadlocks, because orphan cleanup needs to lock the superblock 2033 * in numerous places. Here we just pop the lock - it's relatively 2034 * harmless, because we are now ready to accept write_super() requests, 2035 * and aviro says that's the only reason for hanging onto the 2036 * superblock lock. 2037 */ 2038 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; 2039 ext4_orphan_cleanup(sb, es); 2040 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; 2041 if (needs_recovery) 2042 printk (KERN_INFO "EXT4-fs: recovery complete.\n"); 2043 ext4_mark_recovery_complete(sb, es); 2044 printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n", 2045 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal": 2046 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered": 2047 "writeback"); 2048 2049 ext4_ext_init(sb); 2050 2051 lock_kernel(); 2052 return 0; 2053 2054 cantfind_ext4: 2055 if (!silent) 2056 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n", 2057 sb->s_id); 2058 goto failed_mount; 2059 2060 failed_mount4: 2061 jbd2_journal_destroy(sbi->s_journal); 2062 failed_mount3: 2063 percpu_counter_destroy(&sbi->s_freeblocks_counter); 2064 percpu_counter_destroy(&sbi->s_freeinodes_counter); 2065 percpu_counter_destroy(&sbi->s_dirs_counter); 2066 failed_mount2: 2067 for (i = 0; i < db_count; i++) 2068 brelse(sbi->s_group_desc[i]); 2069 kfree(sbi->s_group_desc); 2070 failed_mount: 2071 #ifdef CONFIG_QUOTA 2072 for (i = 0; i < MAXQUOTAS; i++) 2073 kfree(sbi->s_qf_names[i]); 2074 #endif 2075 ext4_blkdev_remove(sbi); 2076 brelse(bh); 2077 out_fail: 2078 sb->s_fs_info = NULL; 2079 kfree(sbi); 2080 lock_kernel(); 2081 return -EINVAL; 2082 } 2083 2084 /* 2085 * Setup any per-fs journal parameters now. We'll do this both on 2086 * initial mount, once the journal has been initialised but before we've 2087 * done any recovery; and again on any subsequent remount. 2088 */ 2089 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) 2090 { 2091 struct ext4_sb_info *sbi = EXT4_SB(sb); 2092 2093 if (sbi->s_commit_interval) 2094 journal->j_commit_interval = sbi->s_commit_interval; 2095 /* We could also set up an ext4-specific default for the commit 2096 * interval here, but for now we'll just fall back to the jbd 2097 * default. */ 2098 2099 spin_lock(&journal->j_state_lock); 2100 if (test_opt(sb, BARRIER)) 2101 journal->j_flags |= JBD2_BARRIER; 2102 else 2103 journal->j_flags &= ~JBD2_BARRIER; 2104 spin_unlock(&journal->j_state_lock); 2105 } 2106 2107 static journal_t *ext4_get_journal(struct super_block *sb, 2108 unsigned int journal_inum) 2109 { 2110 struct inode *journal_inode; 2111 journal_t *journal; 2112 2113 /* First, test for the existence of a valid inode on disk. Bad 2114 * things happen if we iget() an unused inode, as the subsequent 2115 * iput() will try to delete it. */ 2116 2117 journal_inode = iget(sb, journal_inum); 2118 if (!journal_inode) { 2119 printk(KERN_ERR "EXT4-fs: no journal found.\n"); 2120 return NULL; 2121 } 2122 if (!journal_inode->i_nlink) { 2123 make_bad_inode(journal_inode); 2124 iput(journal_inode); 2125 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n"); 2126 return NULL; 2127 } 2128 2129 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n", 2130 journal_inode, journal_inode->i_size); 2131 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) { 2132 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n"); 2133 iput(journal_inode); 2134 return NULL; 2135 } 2136 2137 journal = jbd2_journal_init_inode(journal_inode); 2138 if (!journal) { 2139 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n"); 2140 iput(journal_inode); 2141 return NULL; 2142 } 2143 journal->j_private = sb; 2144 ext4_init_journal_params(sb, journal); 2145 return journal; 2146 } 2147 2148 static journal_t *ext4_get_dev_journal(struct super_block *sb, 2149 dev_t j_dev) 2150 { 2151 struct buffer_head * bh; 2152 journal_t *journal; 2153 ext4_fsblk_t start; 2154 ext4_fsblk_t len; 2155 int hblock, blocksize; 2156 ext4_fsblk_t sb_block; 2157 unsigned long offset; 2158 struct ext4_super_block * es; 2159 struct block_device *bdev; 2160 2161 bdev = ext4_blkdev_get(j_dev); 2162 if (bdev == NULL) 2163 return NULL; 2164 2165 if (bd_claim(bdev, sb)) { 2166 printk(KERN_ERR 2167 "EXT4: failed to claim external journal device.\n"); 2168 blkdev_put(bdev); 2169 return NULL; 2170 } 2171 2172 blocksize = sb->s_blocksize; 2173 hblock = bdev_hardsect_size(bdev); 2174 if (blocksize < hblock) { 2175 printk(KERN_ERR 2176 "EXT4-fs: blocksize too small for journal device.\n"); 2177 goto out_bdev; 2178 } 2179 2180 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; 2181 offset = EXT4_MIN_BLOCK_SIZE % blocksize; 2182 set_blocksize(bdev, blocksize); 2183 if (!(bh = __bread(bdev, sb_block, blocksize))) { 2184 printk(KERN_ERR "EXT4-fs: couldn't read superblock of " 2185 "external journal\n"); 2186 goto out_bdev; 2187 } 2188 2189 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 2190 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || 2191 !(le32_to_cpu(es->s_feature_incompat) & 2192 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { 2193 printk(KERN_ERR "EXT4-fs: external journal has " 2194 "bad superblock\n"); 2195 brelse(bh); 2196 goto out_bdev; 2197 } 2198 2199 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { 2200 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n"); 2201 brelse(bh); 2202 goto out_bdev; 2203 } 2204 2205 len = ext4_blocks_count(es); 2206 start = sb_block + 1; 2207 brelse(bh); /* we're done with the superblock */ 2208 2209 journal = jbd2_journal_init_dev(bdev, sb->s_bdev, 2210 start, len, blocksize); 2211 if (!journal) { 2212 printk(KERN_ERR "EXT4-fs: failed to create device journal\n"); 2213 goto out_bdev; 2214 } 2215 journal->j_private = sb; 2216 ll_rw_block(READ, 1, &journal->j_sb_buffer); 2217 wait_on_buffer(journal->j_sb_buffer); 2218 if (!buffer_uptodate(journal->j_sb_buffer)) { 2219 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n"); 2220 goto out_journal; 2221 } 2222 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { 2223 printk(KERN_ERR "EXT4-fs: External journal has more than one " 2224 "user (unsupported) - %d\n", 2225 be32_to_cpu(journal->j_superblock->s_nr_users)); 2226 goto out_journal; 2227 } 2228 EXT4_SB(sb)->journal_bdev = bdev; 2229 ext4_init_journal_params(sb, journal); 2230 return journal; 2231 out_journal: 2232 jbd2_journal_destroy(journal); 2233 out_bdev: 2234 ext4_blkdev_put(bdev); 2235 return NULL; 2236 } 2237 2238 static int ext4_load_journal(struct super_block *sb, 2239 struct ext4_super_block *es, 2240 unsigned long journal_devnum) 2241 { 2242 journal_t *journal; 2243 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); 2244 dev_t journal_dev; 2245 int err = 0; 2246 int really_read_only; 2247 2248 if (journal_devnum && 2249 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 2250 printk(KERN_INFO "EXT4-fs: external journal device major/minor " 2251 "numbers have changed\n"); 2252 journal_dev = new_decode_dev(journal_devnum); 2253 } else 2254 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); 2255 2256 really_read_only = bdev_read_only(sb->s_bdev); 2257 2258 /* 2259 * Are we loading a blank journal or performing recovery after a 2260 * crash? For recovery, we need to check in advance whether we 2261 * can get read-write access to the device. 2262 */ 2263 2264 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 2265 if (sb->s_flags & MS_RDONLY) { 2266 printk(KERN_INFO "EXT4-fs: INFO: recovery " 2267 "required on readonly filesystem.\n"); 2268 if (really_read_only) { 2269 printk(KERN_ERR "EXT4-fs: write access " 2270 "unavailable, cannot proceed.\n"); 2271 return -EROFS; 2272 } 2273 printk (KERN_INFO "EXT4-fs: write access will " 2274 "be enabled during recovery.\n"); 2275 } 2276 } 2277 2278 if (journal_inum && journal_dev) { 2279 printk(KERN_ERR "EXT4-fs: filesystem has both journal " 2280 "and inode journals!\n"); 2281 return -EINVAL; 2282 } 2283 2284 if (journal_inum) { 2285 if (!(journal = ext4_get_journal(sb, journal_inum))) 2286 return -EINVAL; 2287 } else { 2288 if (!(journal = ext4_get_dev_journal(sb, journal_dev))) 2289 return -EINVAL; 2290 } 2291 2292 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { 2293 err = jbd2_journal_update_format(journal); 2294 if (err) { 2295 printk(KERN_ERR "EXT4-fs: error updating journal.\n"); 2296 jbd2_journal_destroy(journal); 2297 return err; 2298 } 2299 } 2300 2301 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) 2302 err = jbd2_journal_wipe(journal, !really_read_only); 2303 if (!err) 2304 err = jbd2_journal_load(journal); 2305 2306 if (err) { 2307 printk(KERN_ERR "EXT4-fs: error loading journal.\n"); 2308 jbd2_journal_destroy(journal); 2309 return err; 2310 } 2311 2312 EXT4_SB(sb)->s_journal = journal; 2313 ext4_clear_journal_err(sb, es); 2314 2315 if (journal_devnum && 2316 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 2317 es->s_journal_dev = cpu_to_le32(journal_devnum); 2318 sb->s_dirt = 1; 2319 2320 /* Make sure we flush the recovery flag to disk. */ 2321 ext4_commit_super(sb, es, 1); 2322 } 2323 2324 return 0; 2325 } 2326 2327 static int ext4_create_journal(struct super_block * sb, 2328 struct ext4_super_block * es, 2329 unsigned int journal_inum) 2330 { 2331 journal_t *journal; 2332 int err; 2333 2334 if (sb->s_flags & MS_RDONLY) { 2335 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to " 2336 "create journal.\n"); 2337 return -EROFS; 2338 } 2339 2340 journal = ext4_get_journal(sb, journal_inum); 2341 if (!journal) 2342 return -EINVAL; 2343 2344 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n", 2345 journal_inum); 2346 2347 err = jbd2_journal_create(journal); 2348 if (err) { 2349 printk(KERN_ERR "EXT4-fs: error creating journal.\n"); 2350 jbd2_journal_destroy(journal); 2351 return -EIO; 2352 } 2353 2354 EXT4_SB(sb)->s_journal = journal; 2355 2356 ext4_update_dynamic_rev(sb); 2357 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2358 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL); 2359 2360 es->s_journal_inum = cpu_to_le32(journal_inum); 2361 sb->s_dirt = 1; 2362 2363 /* Make sure we flush the recovery flag to disk. */ 2364 ext4_commit_super(sb, es, 1); 2365 2366 return 0; 2367 } 2368 2369 static void ext4_commit_super (struct super_block * sb, 2370 struct ext4_super_block * es, 2371 int sync) 2372 { 2373 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; 2374 2375 if (!sbh) 2376 return; 2377 es->s_wtime = cpu_to_le32(get_seconds()); 2378 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb)); 2379 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb)); 2380 BUFFER_TRACE(sbh, "marking dirty"); 2381 mark_buffer_dirty(sbh); 2382 if (sync) 2383 sync_dirty_buffer(sbh); 2384 } 2385 2386 2387 /* 2388 * Have we just finished recovery? If so, and if we are mounting (or 2389 * remounting) the filesystem readonly, then we will end up with a 2390 * consistent fs on disk. Record that fact. 2391 */ 2392 static void ext4_mark_recovery_complete(struct super_block * sb, 2393 struct ext4_super_block * es) 2394 { 2395 journal_t *journal = EXT4_SB(sb)->s_journal; 2396 2397 jbd2_journal_lock_updates(journal); 2398 jbd2_journal_flush(journal); 2399 lock_super(sb); 2400 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && 2401 sb->s_flags & MS_RDONLY) { 2402 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2403 sb->s_dirt = 0; 2404 ext4_commit_super(sb, es, 1); 2405 } 2406 unlock_super(sb); 2407 jbd2_journal_unlock_updates(journal); 2408 } 2409 2410 /* 2411 * If we are mounting (or read-write remounting) a filesystem whose journal 2412 * has recorded an error from a previous lifetime, move that error to the 2413 * main filesystem now. 2414 */ 2415 static void ext4_clear_journal_err(struct super_block * sb, 2416 struct ext4_super_block * es) 2417 { 2418 journal_t *journal; 2419 int j_errno; 2420 const char *errstr; 2421 2422 journal = EXT4_SB(sb)->s_journal; 2423 2424 /* 2425 * Now check for any error status which may have been recorded in the 2426 * journal by a prior ext4_error() or ext4_abort() 2427 */ 2428 2429 j_errno = jbd2_journal_errno(journal); 2430 if (j_errno) { 2431 char nbuf[16]; 2432 2433 errstr = ext4_decode_error(sb, j_errno, nbuf); 2434 ext4_warning(sb, __FUNCTION__, "Filesystem error recorded " 2435 "from previous mount: %s", errstr); 2436 ext4_warning(sb, __FUNCTION__, "Marking fs in need of " 2437 "filesystem check."); 2438 2439 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 2440 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 2441 ext4_commit_super (sb, es, 1); 2442 2443 jbd2_journal_clear_err(journal); 2444 } 2445 } 2446 2447 /* 2448 * Force the running and committing transactions to commit, 2449 * and wait on the commit. 2450 */ 2451 int ext4_force_commit(struct super_block *sb) 2452 { 2453 journal_t *journal; 2454 int ret; 2455 2456 if (sb->s_flags & MS_RDONLY) 2457 return 0; 2458 2459 journal = EXT4_SB(sb)->s_journal; 2460 sb->s_dirt = 0; 2461 ret = ext4_journal_force_commit(journal); 2462 return ret; 2463 } 2464 2465 /* 2466 * Ext4 always journals updates to the superblock itself, so we don't 2467 * have to propagate any other updates to the superblock on disk at this 2468 * point. Just start an async writeback to get the buffers on their way 2469 * to the disk. 2470 * 2471 * This implicitly triggers the writebehind on sync(). 2472 */ 2473 2474 static void ext4_write_super (struct super_block * sb) 2475 { 2476 if (mutex_trylock(&sb->s_lock) != 0) 2477 BUG(); 2478 sb->s_dirt = 0; 2479 } 2480 2481 static int ext4_sync_fs(struct super_block *sb, int wait) 2482 { 2483 tid_t target; 2484 2485 sb->s_dirt = 0; 2486 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) { 2487 if (wait) 2488 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target); 2489 } 2490 return 0; 2491 } 2492 2493 /* 2494 * LVM calls this function before a (read-only) snapshot is created. This 2495 * gives us a chance to flush the journal completely and mark the fs clean. 2496 */ 2497 static void ext4_write_super_lockfs(struct super_block *sb) 2498 { 2499 sb->s_dirt = 0; 2500 2501 if (!(sb->s_flags & MS_RDONLY)) { 2502 journal_t *journal = EXT4_SB(sb)->s_journal; 2503 2504 /* Now we set up the journal barrier. */ 2505 jbd2_journal_lock_updates(journal); 2506 jbd2_journal_flush(journal); 2507 2508 /* Journal blocked and flushed, clear needs_recovery flag. */ 2509 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2510 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); 2511 } 2512 } 2513 2514 /* 2515 * Called by LVM after the snapshot is done. We need to reset the RECOVER 2516 * flag here, even though the filesystem is not technically dirty yet. 2517 */ 2518 static void ext4_unlockfs(struct super_block *sb) 2519 { 2520 if (!(sb->s_flags & MS_RDONLY)) { 2521 lock_super(sb); 2522 /* Reser the needs_recovery flag before the fs is unlocked. */ 2523 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2524 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); 2525 unlock_super(sb); 2526 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 2527 } 2528 } 2529 2530 static int ext4_remount (struct super_block * sb, int * flags, char * data) 2531 { 2532 struct ext4_super_block * es; 2533 struct ext4_sb_info *sbi = EXT4_SB(sb); 2534 ext4_fsblk_t n_blocks_count = 0; 2535 unsigned long old_sb_flags; 2536 struct ext4_mount_options old_opts; 2537 int err; 2538 #ifdef CONFIG_QUOTA 2539 int i; 2540 #endif 2541 2542 /* Store the original options */ 2543 old_sb_flags = sb->s_flags; 2544 old_opts.s_mount_opt = sbi->s_mount_opt; 2545 old_opts.s_resuid = sbi->s_resuid; 2546 old_opts.s_resgid = sbi->s_resgid; 2547 old_opts.s_commit_interval = sbi->s_commit_interval; 2548 #ifdef CONFIG_QUOTA 2549 old_opts.s_jquota_fmt = sbi->s_jquota_fmt; 2550 for (i = 0; i < MAXQUOTAS; i++) 2551 old_opts.s_qf_names[i] = sbi->s_qf_names[i]; 2552 #endif 2553 2554 /* 2555 * Allow the "check" option to be passed as a remount option. 2556 */ 2557 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) { 2558 err = -EINVAL; 2559 goto restore_opts; 2560 } 2561 2562 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) 2563 ext4_abort(sb, __FUNCTION__, "Abort forced by user"); 2564 2565 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 2566 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 2567 2568 es = sbi->s_es; 2569 2570 ext4_init_journal_params(sb, sbi->s_journal); 2571 2572 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || 2573 n_blocks_count > ext4_blocks_count(es)) { 2574 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) { 2575 err = -EROFS; 2576 goto restore_opts; 2577 } 2578 2579 if (*flags & MS_RDONLY) { 2580 /* 2581 * First of all, the unconditional stuff we have to do 2582 * to disable replay of the journal when we next remount 2583 */ 2584 sb->s_flags |= MS_RDONLY; 2585 2586 /* 2587 * OK, test if we are remounting a valid rw partition 2588 * readonly, and if so set the rdonly flag and then 2589 * mark the partition as valid again. 2590 */ 2591 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && 2592 (sbi->s_mount_state & EXT4_VALID_FS)) 2593 es->s_state = cpu_to_le16(sbi->s_mount_state); 2594 2595 /* 2596 * We have to unlock super so that we can wait for 2597 * transactions. 2598 */ 2599 unlock_super(sb); 2600 ext4_mark_recovery_complete(sb, es); 2601 lock_super(sb); 2602 } else { 2603 __le32 ret; 2604 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb, 2605 ~EXT4_FEATURE_RO_COMPAT_SUPP))) { 2606 printk(KERN_WARNING "EXT4-fs: %s: couldn't " 2607 "remount RDWR because of unsupported " 2608 "optional features (%x).\n", 2609 sb->s_id, le32_to_cpu(ret)); 2610 err = -EROFS; 2611 goto restore_opts; 2612 } 2613 2614 /* 2615 * If we have an unprocessed orphan list hanging 2616 * around from a previously readonly bdev mount, 2617 * require a full umount/remount for now. 2618 */ 2619 if (es->s_last_orphan) { 2620 printk(KERN_WARNING "EXT4-fs: %s: couldn't " 2621 "remount RDWR because of unprocessed " 2622 "orphan inode list. Please " 2623 "umount/remount instead.\n", 2624 sb->s_id); 2625 err = -EINVAL; 2626 goto restore_opts; 2627 } 2628 2629 /* 2630 * Mounting a RDONLY partition read-write, so reread 2631 * and store the current valid flag. (It may have 2632 * been changed by e2fsck since we originally mounted 2633 * the partition.) 2634 */ 2635 ext4_clear_journal_err(sb, es); 2636 sbi->s_mount_state = le16_to_cpu(es->s_state); 2637 if ((err = ext4_group_extend(sb, es, n_blocks_count))) 2638 goto restore_opts; 2639 if (!ext4_setup_super (sb, es, 0)) 2640 sb->s_flags &= ~MS_RDONLY; 2641 } 2642 } 2643 #ifdef CONFIG_QUOTA 2644 /* Release old quota file names */ 2645 for (i = 0; i < MAXQUOTAS; i++) 2646 if (old_opts.s_qf_names[i] && 2647 old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 2648 kfree(old_opts.s_qf_names[i]); 2649 #endif 2650 return 0; 2651 restore_opts: 2652 sb->s_flags = old_sb_flags; 2653 sbi->s_mount_opt = old_opts.s_mount_opt; 2654 sbi->s_resuid = old_opts.s_resuid; 2655 sbi->s_resgid = old_opts.s_resgid; 2656 sbi->s_commit_interval = old_opts.s_commit_interval; 2657 #ifdef CONFIG_QUOTA 2658 sbi->s_jquota_fmt = old_opts.s_jquota_fmt; 2659 for (i = 0; i < MAXQUOTAS; i++) { 2660 if (sbi->s_qf_names[i] && 2661 old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 2662 kfree(sbi->s_qf_names[i]); 2663 sbi->s_qf_names[i] = old_opts.s_qf_names[i]; 2664 } 2665 #endif 2666 return err; 2667 } 2668 2669 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf) 2670 { 2671 struct super_block *sb = dentry->d_sb; 2672 struct ext4_sb_info *sbi = EXT4_SB(sb); 2673 struct ext4_super_block *es = sbi->s_es; 2674 u64 fsid; 2675 2676 if (test_opt(sb, MINIX_DF)) { 2677 sbi->s_overhead_last = 0; 2678 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) { 2679 ext4_group_t ngroups = sbi->s_groups_count, i; 2680 ext4_fsblk_t overhead = 0; 2681 smp_rmb(); 2682 2683 /* 2684 * Compute the overhead (FS structures). This is constant 2685 * for a given filesystem unless the number of block groups 2686 * changes so we cache the previous value until it does. 2687 */ 2688 2689 /* 2690 * All of the blocks before first_data_block are 2691 * overhead 2692 */ 2693 overhead = le32_to_cpu(es->s_first_data_block); 2694 2695 /* 2696 * Add the overhead attributed to the superblock and 2697 * block group descriptors. If the sparse superblocks 2698 * feature is turned on, then not all groups have this. 2699 */ 2700 for (i = 0; i < ngroups; i++) { 2701 overhead += ext4_bg_has_super(sb, i) + 2702 ext4_bg_num_gdb(sb, i); 2703 cond_resched(); 2704 } 2705 2706 /* 2707 * Every block group has an inode bitmap, a block 2708 * bitmap, and an inode table. 2709 */ 2710 overhead += ngroups * (2 + sbi->s_itb_per_group); 2711 sbi->s_overhead_last = overhead; 2712 smp_wmb(); 2713 sbi->s_blocks_last = ext4_blocks_count(es); 2714 } 2715 2716 buf->f_type = EXT4_SUPER_MAGIC; 2717 buf->f_bsize = sb->s_blocksize; 2718 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last; 2719 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter); 2720 ext4_free_blocks_count_set(es, buf->f_bfree); 2721 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); 2722 if (buf->f_bfree < ext4_r_blocks_count(es)) 2723 buf->f_bavail = 0; 2724 buf->f_files = le32_to_cpu(es->s_inodes_count); 2725 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); 2726 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); 2727 buf->f_namelen = EXT4_NAME_LEN; 2728 fsid = le64_to_cpup((void *)es->s_uuid) ^ 2729 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 2730 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 2731 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 2732 return 0; 2733 } 2734 2735 /* Helper function for writing quotas on sync - we need to start transaction before quota file 2736 * is locked for write. Otherwise the are possible deadlocks: 2737 * Process 1 Process 2 2738 * ext4_create() quota_sync() 2739 * jbd2_journal_start() write_dquot() 2740 * DQUOT_INIT() down(dqio_mutex) 2741 * down(dqio_mutex) jbd2_journal_start() 2742 * 2743 */ 2744 2745 #ifdef CONFIG_QUOTA 2746 2747 static inline struct inode *dquot_to_inode(struct dquot *dquot) 2748 { 2749 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; 2750 } 2751 2752 static int ext4_dquot_initialize(struct inode *inode, int type) 2753 { 2754 handle_t *handle; 2755 int ret, err; 2756 2757 /* We may create quota structure so we need to reserve enough blocks */ 2758 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb)); 2759 if (IS_ERR(handle)) 2760 return PTR_ERR(handle); 2761 ret = dquot_initialize(inode, type); 2762 err = ext4_journal_stop(handle); 2763 if (!ret) 2764 ret = err; 2765 return ret; 2766 } 2767 2768 static int ext4_dquot_drop(struct inode *inode) 2769 { 2770 handle_t *handle; 2771 int ret, err; 2772 2773 /* We may delete quota structure so we need to reserve enough blocks */ 2774 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb)); 2775 if (IS_ERR(handle)) 2776 return PTR_ERR(handle); 2777 ret = dquot_drop(inode); 2778 err = ext4_journal_stop(handle); 2779 if (!ret) 2780 ret = err; 2781 return ret; 2782 } 2783 2784 static int ext4_write_dquot(struct dquot *dquot) 2785 { 2786 int ret, err; 2787 handle_t *handle; 2788 struct inode *inode; 2789 2790 inode = dquot_to_inode(dquot); 2791 handle = ext4_journal_start(inode, 2792 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 2793 if (IS_ERR(handle)) 2794 return PTR_ERR(handle); 2795 ret = dquot_commit(dquot); 2796 err = ext4_journal_stop(handle); 2797 if (!ret) 2798 ret = err; 2799 return ret; 2800 } 2801 2802 static int ext4_acquire_dquot(struct dquot *dquot) 2803 { 2804 int ret, err; 2805 handle_t *handle; 2806 2807 handle = ext4_journal_start(dquot_to_inode(dquot), 2808 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 2809 if (IS_ERR(handle)) 2810 return PTR_ERR(handle); 2811 ret = dquot_acquire(dquot); 2812 err = ext4_journal_stop(handle); 2813 if (!ret) 2814 ret = err; 2815 return ret; 2816 } 2817 2818 static int ext4_release_dquot(struct dquot *dquot) 2819 { 2820 int ret, err; 2821 handle_t *handle; 2822 2823 handle = ext4_journal_start(dquot_to_inode(dquot), 2824 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 2825 if (IS_ERR(handle)) { 2826 /* Release dquot anyway to avoid endless cycle in dqput() */ 2827 dquot_release(dquot); 2828 return PTR_ERR(handle); 2829 } 2830 ret = dquot_release(dquot); 2831 err = ext4_journal_stop(handle); 2832 if (!ret) 2833 ret = err; 2834 return ret; 2835 } 2836 2837 static int ext4_mark_dquot_dirty(struct dquot *dquot) 2838 { 2839 /* Are we journalling quotas? */ 2840 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || 2841 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { 2842 dquot_mark_dquot_dirty(dquot); 2843 return ext4_write_dquot(dquot); 2844 } else { 2845 return dquot_mark_dquot_dirty(dquot); 2846 } 2847 } 2848 2849 static int ext4_write_info(struct super_block *sb, int type) 2850 { 2851 int ret, err; 2852 handle_t *handle; 2853 2854 /* Data block + inode block */ 2855 handle = ext4_journal_start(sb->s_root->d_inode, 2); 2856 if (IS_ERR(handle)) 2857 return PTR_ERR(handle); 2858 ret = dquot_commit_info(sb, type); 2859 err = ext4_journal_stop(handle); 2860 if (!ret) 2861 ret = err; 2862 return ret; 2863 } 2864 2865 /* 2866 * Turn on quotas during mount time - we need to find 2867 * the quota file and such... 2868 */ 2869 static int ext4_quota_on_mount(struct super_block *sb, int type) 2870 { 2871 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], 2872 EXT4_SB(sb)->s_jquota_fmt, type); 2873 } 2874 2875 /* 2876 * Standard function to be called on quota_on 2877 */ 2878 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 2879 char *path) 2880 { 2881 int err; 2882 struct nameidata nd; 2883 2884 if (!test_opt(sb, QUOTA)) 2885 return -EINVAL; 2886 /* Not journalling quota? */ 2887 if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] && 2888 !EXT4_SB(sb)->s_qf_names[GRPQUOTA]) 2889 return vfs_quota_on(sb, type, format_id, path); 2890 err = path_lookup(path, LOOKUP_FOLLOW, &nd); 2891 if (err) 2892 return err; 2893 /* Quotafile not on the same filesystem? */ 2894 if (nd.mnt->mnt_sb != sb) { 2895 path_release(&nd); 2896 return -EXDEV; 2897 } 2898 /* Quotafile not of fs root? */ 2899 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode) 2900 printk(KERN_WARNING 2901 "EXT4-fs: Quota file not on filesystem root. " 2902 "Journalled quota will not work.\n"); 2903 path_release(&nd); 2904 return vfs_quota_on(sb, type, format_id, path); 2905 } 2906 2907 /* Read data from quotafile - avoid pagecache and such because we cannot afford 2908 * acquiring the locks... As quota files are never truncated and quota code 2909 * itself serializes the operations (and noone else should touch the files) 2910 * we don't have to be afraid of races */ 2911 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 2912 size_t len, loff_t off) 2913 { 2914 struct inode *inode = sb_dqopt(sb)->files[type]; 2915 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 2916 int err = 0; 2917 int offset = off & (sb->s_blocksize - 1); 2918 int tocopy; 2919 size_t toread; 2920 struct buffer_head *bh; 2921 loff_t i_size = i_size_read(inode); 2922 2923 if (off > i_size) 2924 return 0; 2925 if (off+len > i_size) 2926 len = i_size-off; 2927 toread = len; 2928 while (toread > 0) { 2929 tocopy = sb->s_blocksize - offset < toread ? 2930 sb->s_blocksize - offset : toread; 2931 bh = ext4_bread(NULL, inode, blk, 0, &err); 2932 if (err) 2933 return err; 2934 if (!bh) /* A hole? */ 2935 memset(data, 0, tocopy); 2936 else 2937 memcpy(data, bh->b_data+offset, tocopy); 2938 brelse(bh); 2939 offset = 0; 2940 toread -= tocopy; 2941 data += tocopy; 2942 blk++; 2943 } 2944 return len; 2945 } 2946 2947 /* Write to quotafile (we know the transaction is already started and has 2948 * enough credits) */ 2949 static ssize_t ext4_quota_write(struct super_block *sb, int type, 2950 const char *data, size_t len, loff_t off) 2951 { 2952 struct inode *inode = sb_dqopt(sb)->files[type]; 2953 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 2954 int err = 0; 2955 int offset = off & (sb->s_blocksize - 1); 2956 int tocopy; 2957 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL; 2958 size_t towrite = len; 2959 struct buffer_head *bh; 2960 handle_t *handle = journal_current_handle(); 2961 2962 if (!handle) { 2963 printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)" 2964 " cancelled because transaction is not started.\n", 2965 (unsigned long long)off, (unsigned long long)len); 2966 return -EIO; 2967 } 2968 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 2969 while (towrite > 0) { 2970 tocopy = sb->s_blocksize - offset < towrite ? 2971 sb->s_blocksize - offset : towrite; 2972 bh = ext4_bread(handle, inode, blk, 1, &err); 2973 if (!bh) 2974 goto out; 2975 if (journal_quota) { 2976 err = ext4_journal_get_write_access(handle, bh); 2977 if (err) { 2978 brelse(bh); 2979 goto out; 2980 } 2981 } 2982 lock_buffer(bh); 2983 memcpy(bh->b_data+offset, data, tocopy); 2984 flush_dcache_page(bh->b_page); 2985 unlock_buffer(bh); 2986 if (journal_quota) 2987 err = ext4_journal_dirty_metadata(handle, bh); 2988 else { 2989 /* Always do at least ordered writes for quotas */ 2990 err = ext4_journal_dirty_data(handle, bh); 2991 mark_buffer_dirty(bh); 2992 } 2993 brelse(bh); 2994 if (err) 2995 goto out; 2996 offset = 0; 2997 towrite -= tocopy; 2998 data += tocopy; 2999 blk++; 3000 } 3001 out: 3002 if (len == towrite) 3003 return err; 3004 if (inode->i_size < off+len-towrite) { 3005 i_size_write(inode, off+len-towrite); 3006 EXT4_I(inode)->i_disksize = inode->i_size; 3007 } 3008 inode->i_version++; 3009 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 3010 ext4_mark_inode_dirty(handle, inode); 3011 mutex_unlock(&inode->i_mutex); 3012 return len - towrite; 3013 } 3014 3015 #endif 3016 3017 static int ext4_get_sb(struct file_system_type *fs_type, 3018 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 3019 { 3020 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt); 3021 } 3022 3023 static struct file_system_type ext4dev_fs_type = { 3024 .owner = THIS_MODULE, 3025 .name = "ext4dev", 3026 .get_sb = ext4_get_sb, 3027 .kill_sb = kill_block_super, 3028 .fs_flags = FS_REQUIRES_DEV, 3029 }; 3030 3031 static int __init init_ext4_fs(void) 3032 { 3033 int err = init_ext4_xattr(); 3034 if (err) 3035 return err; 3036 err = init_inodecache(); 3037 if (err) 3038 goto out1; 3039 err = register_filesystem(&ext4dev_fs_type); 3040 if (err) 3041 goto out; 3042 return 0; 3043 out: 3044 destroy_inodecache(); 3045 out1: 3046 exit_ext4_xattr(); 3047 return err; 3048 } 3049 3050 static void __exit exit_ext4_fs(void) 3051 { 3052 unregister_filesystem(&ext4dev_fs_type); 3053 destroy_inodecache(); 3054 exit_ext4_xattr(); 3055 } 3056 3057 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); 3058 MODULE_DESCRIPTION("Fourth Extended Filesystem with extents"); 3059 MODULE_LICENSE("GPL"); 3060 module_init(init_ext4_fs) 3061 module_exit(exit_ext4_fs) 3062