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 dentry *ext4_get_dentry(struct super_block *sb, void *vobjp) 690 { 691 __u32 *objp = vobjp; 692 unsigned long ino = objp[0]; 693 __u32 generation = objp[1]; 694 struct inode *inode; 695 struct dentry *result; 696 697 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) 698 return ERR_PTR(-ESTALE); 699 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) 700 return ERR_PTR(-ESTALE); 701 702 /* iget isn't really right if the inode is currently unallocated!! 703 * 704 * ext4_read_inode will return a bad_inode if the inode had been 705 * deleted, so we should be safe. 706 * 707 * Currently we don't know the generation for parent directory, so 708 * a generation of 0 means "accept any" 709 */ 710 inode = iget(sb, ino); 711 if (inode == NULL) 712 return ERR_PTR(-ENOMEM); 713 if (is_bad_inode(inode) || 714 (generation && inode->i_generation != generation)) { 715 iput(inode); 716 return ERR_PTR(-ESTALE); 717 } 718 /* now to find a dentry. 719 * If possible, get a well-connected one 720 */ 721 result = d_alloc_anon(inode); 722 if (!result) { 723 iput(inode); 724 return ERR_PTR(-ENOMEM); 725 } 726 return result; 727 } 728 729 #ifdef CONFIG_QUOTA 730 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group") 731 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) 732 733 static int ext4_dquot_initialize(struct inode *inode, int type); 734 static int ext4_dquot_drop(struct inode *inode); 735 static int ext4_write_dquot(struct dquot *dquot); 736 static int ext4_acquire_dquot(struct dquot *dquot); 737 static int ext4_release_dquot(struct dquot *dquot); 738 static int ext4_mark_dquot_dirty(struct dquot *dquot); 739 static int ext4_write_info(struct super_block *sb, int type); 740 static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path); 741 static int ext4_quota_on_mount(struct super_block *sb, int type); 742 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 743 size_t len, loff_t off); 744 static ssize_t ext4_quota_write(struct super_block *sb, int type, 745 const char *data, size_t len, loff_t off); 746 747 static struct dquot_operations ext4_quota_operations = { 748 .initialize = ext4_dquot_initialize, 749 .drop = ext4_dquot_drop, 750 .alloc_space = dquot_alloc_space, 751 .alloc_inode = dquot_alloc_inode, 752 .free_space = dquot_free_space, 753 .free_inode = dquot_free_inode, 754 .transfer = dquot_transfer, 755 .write_dquot = ext4_write_dquot, 756 .acquire_dquot = ext4_acquire_dquot, 757 .release_dquot = ext4_release_dquot, 758 .mark_dirty = ext4_mark_dquot_dirty, 759 .write_info = ext4_write_info 760 }; 761 762 static struct quotactl_ops ext4_qctl_operations = { 763 .quota_on = ext4_quota_on, 764 .quota_off = vfs_quota_off, 765 .quota_sync = vfs_quota_sync, 766 .get_info = vfs_get_dqinfo, 767 .set_info = vfs_set_dqinfo, 768 .get_dqblk = vfs_get_dqblk, 769 .set_dqblk = vfs_set_dqblk 770 }; 771 #endif 772 773 static const struct super_operations ext4_sops = { 774 .alloc_inode = ext4_alloc_inode, 775 .destroy_inode = ext4_destroy_inode, 776 .read_inode = ext4_read_inode, 777 .write_inode = ext4_write_inode, 778 .dirty_inode = ext4_dirty_inode, 779 .delete_inode = ext4_delete_inode, 780 .put_super = ext4_put_super, 781 .write_super = ext4_write_super, 782 .sync_fs = ext4_sync_fs, 783 .write_super_lockfs = ext4_write_super_lockfs, 784 .unlockfs = ext4_unlockfs, 785 .statfs = ext4_statfs, 786 .remount_fs = ext4_remount, 787 .clear_inode = ext4_clear_inode, 788 .show_options = ext4_show_options, 789 #ifdef CONFIG_QUOTA 790 .quota_read = ext4_quota_read, 791 .quota_write = ext4_quota_write, 792 #endif 793 }; 794 795 static struct export_operations ext4_export_ops = { 796 .get_parent = ext4_get_parent, 797 .get_dentry = ext4_get_dentry, 798 }; 799 800 enum { 801 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 802 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, 803 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov, 804 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, 805 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh, 806 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev, 807 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, 808 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, 809 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota, 810 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota, 811 Opt_grpquota, Opt_extents, Opt_noextents, 812 }; 813 814 static match_table_t tokens = { 815 {Opt_bsd_df, "bsddf"}, 816 {Opt_minix_df, "minixdf"}, 817 {Opt_grpid, "grpid"}, 818 {Opt_grpid, "bsdgroups"}, 819 {Opt_nogrpid, "nogrpid"}, 820 {Opt_nogrpid, "sysvgroups"}, 821 {Opt_resgid, "resgid=%u"}, 822 {Opt_resuid, "resuid=%u"}, 823 {Opt_sb, "sb=%u"}, 824 {Opt_err_cont, "errors=continue"}, 825 {Opt_err_panic, "errors=panic"}, 826 {Opt_err_ro, "errors=remount-ro"}, 827 {Opt_nouid32, "nouid32"}, 828 {Opt_nocheck, "nocheck"}, 829 {Opt_nocheck, "check=none"}, 830 {Opt_debug, "debug"}, 831 {Opt_oldalloc, "oldalloc"}, 832 {Opt_orlov, "orlov"}, 833 {Opt_user_xattr, "user_xattr"}, 834 {Opt_nouser_xattr, "nouser_xattr"}, 835 {Opt_acl, "acl"}, 836 {Opt_noacl, "noacl"}, 837 {Opt_reservation, "reservation"}, 838 {Opt_noreservation, "noreservation"}, 839 {Opt_noload, "noload"}, 840 {Opt_nobh, "nobh"}, 841 {Opt_bh, "bh"}, 842 {Opt_commit, "commit=%u"}, 843 {Opt_journal_update, "journal=update"}, 844 {Opt_journal_inum, "journal=%u"}, 845 {Opt_journal_dev, "journal_dev=%u"}, 846 {Opt_abort, "abort"}, 847 {Opt_data_journal, "data=journal"}, 848 {Opt_data_ordered, "data=ordered"}, 849 {Opt_data_writeback, "data=writeback"}, 850 {Opt_offusrjquota, "usrjquota="}, 851 {Opt_usrjquota, "usrjquota=%s"}, 852 {Opt_offgrpjquota, "grpjquota="}, 853 {Opt_grpjquota, "grpjquota=%s"}, 854 {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, 855 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, 856 {Opt_grpquota, "grpquota"}, 857 {Opt_noquota, "noquota"}, 858 {Opt_quota, "quota"}, 859 {Opt_usrquota, "usrquota"}, 860 {Opt_barrier, "barrier=%u"}, 861 {Opt_extents, "extents"}, 862 {Opt_noextents, "noextents"}, 863 {Opt_err, NULL}, 864 {Opt_resize, "resize"}, 865 }; 866 867 static ext4_fsblk_t get_sb_block(void **data) 868 { 869 ext4_fsblk_t sb_block; 870 char *options = (char *) *data; 871 872 if (!options || strncmp(options, "sb=", 3) != 0) 873 return 1; /* Default location */ 874 options += 3; 875 /*todo: use simple_strtoll with >32bit ext4 */ 876 sb_block = simple_strtoul(options, &options, 0); 877 if (*options && *options != ',') { 878 printk("EXT4-fs: Invalid sb specification: %s\n", 879 (char *) *data); 880 return 1; 881 } 882 if (*options == ',') 883 options++; 884 *data = (void *) options; 885 return sb_block; 886 } 887 888 static int parse_options (char *options, struct super_block *sb, 889 unsigned int *inum, unsigned long *journal_devnum, 890 ext4_fsblk_t *n_blocks_count, int is_remount) 891 { 892 struct ext4_sb_info *sbi = EXT4_SB(sb); 893 char * p; 894 substring_t args[MAX_OPT_ARGS]; 895 int data_opt = 0; 896 int option; 897 #ifdef CONFIG_QUOTA 898 int qtype; 899 char *qname; 900 #endif 901 902 if (!options) 903 return 1; 904 905 while ((p = strsep (&options, ",")) != NULL) { 906 int token; 907 if (!*p) 908 continue; 909 910 token = match_token(p, tokens, args); 911 switch (token) { 912 case Opt_bsd_df: 913 clear_opt (sbi->s_mount_opt, MINIX_DF); 914 break; 915 case Opt_minix_df: 916 set_opt (sbi->s_mount_opt, MINIX_DF); 917 break; 918 case Opt_grpid: 919 set_opt (sbi->s_mount_opt, GRPID); 920 break; 921 case Opt_nogrpid: 922 clear_opt (sbi->s_mount_opt, GRPID); 923 break; 924 case Opt_resuid: 925 if (match_int(&args[0], &option)) 926 return 0; 927 sbi->s_resuid = option; 928 break; 929 case Opt_resgid: 930 if (match_int(&args[0], &option)) 931 return 0; 932 sbi->s_resgid = option; 933 break; 934 case Opt_sb: 935 /* handled by get_sb_block() instead of here */ 936 /* *sb_block = match_int(&args[0]); */ 937 break; 938 case Opt_err_panic: 939 clear_opt (sbi->s_mount_opt, ERRORS_CONT); 940 clear_opt (sbi->s_mount_opt, ERRORS_RO); 941 set_opt (sbi->s_mount_opt, ERRORS_PANIC); 942 break; 943 case Opt_err_ro: 944 clear_opt (sbi->s_mount_opt, ERRORS_CONT); 945 clear_opt (sbi->s_mount_opt, ERRORS_PANIC); 946 set_opt (sbi->s_mount_opt, ERRORS_RO); 947 break; 948 case Opt_err_cont: 949 clear_opt (sbi->s_mount_opt, ERRORS_RO); 950 clear_opt (sbi->s_mount_opt, ERRORS_PANIC); 951 set_opt (sbi->s_mount_opt, ERRORS_CONT); 952 break; 953 case Opt_nouid32: 954 set_opt (sbi->s_mount_opt, NO_UID32); 955 break; 956 case Opt_nocheck: 957 clear_opt (sbi->s_mount_opt, CHECK); 958 break; 959 case Opt_debug: 960 set_opt (sbi->s_mount_opt, DEBUG); 961 break; 962 case Opt_oldalloc: 963 set_opt (sbi->s_mount_opt, OLDALLOC); 964 break; 965 case Opt_orlov: 966 clear_opt (sbi->s_mount_opt, OLDALLOC); 967 break; 968 #ifdef CONFIG_EXT4DEV_FS_XATTR 969 case Opt_user_xattr: 970 set_opt (sbi->s_mount_opt, XATTR_USER); 971 break; 972 case Opt_nouser_xattr: 973 clear_opt (sbi->s_mount_opt, XATTR_USER); 974 break; 975 #else 976 case Opt_user_xattr: 977 case Opt_nouser_xattr: 978 printk("EXT4 (no)user_xattr options not supported\n"); 979 break; 980 #endif 981 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 982 case Opt_acl: 983 set_opt(sbi->s_mount_opt, POSIX_ACL); 984 break; 985 case Opt_noacl: 986 clear_opt(sbi->s_mount_opt, POSIX_ACL); 987 break; 988 #else 989 case Opt_acl: 990 case Opt_noacl: 991 printk("EXT4 (no)acl options not supported\n"); 992 break; 993 #endif 994 case Opt_reservation: 995 set_opt(sbi->s_mount_opt, RESERVATION); 996 break; 997 case Opt_noreservation: 998 clear_opt(sbi->s_mount_opt, RESERVATION); 999 break; 1000 case Opt_journal_update: 1001 /* @@@ FIXME */ 1002 /* Eventually we will want to be able to create 1003 a journal file here. For now, only allow the 1004 user to specify an existing inode to be the 1005 journal file. */ 1006 if (is_remount) { 1007 printk(KERN_ERR "EXT4-fs: cannot specify " 1008 "journal on remount\n"); 1009 return 0; 1010 } 1011 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL); 1012 break; 1013 case Opt_journal_inum: 1014 if (is_remount) { 1015 printk(KERN_ERR "EXT4-fs: cannot specify " 1016 "journal on remount\n"); 1017 return 0; 1018 } 1019 if (match_int(&args[0], &option)) 1020 return 0; 1021 *inum = option; 1022 break; 1023 case Opt_journal_dev: 1024 if (is_remount) { 1025 printk(KERN_ERR "EXT4-fs: cannot specify " 1026 "journal on remount\n"); 1027 return 0; 1028 } 1029 if (match_int(&args[0], &option)) 1030 return 0; 1031 *journal_devnum = option; 1032 break; 1033 case Opt_noload: 1034 set_opt (sbi->s_mount_opt, NOLOAD); 1035 break; 1036 case Opt_commit: 1037 if (match_int(&args[0], &option)) 1038 return 0; 1039 if (option < 0) 1040 return 0; 1041 if (option == 0) 1042 option = JBD2_DEFAULT_MAX_COMMIT_AGE; 1043 sbi->s_commit_interval = HZ * option; 1044 break; 1045 case Opt_data_journal: 1046 data_opt = EXT4_MOUNT_JOURNAL_DATA; 1047 goto datacheck; 1048 case Opt_data_ordered: 1049 data_opt = EXT4_MOUNT_ORDERED_DATA; 1050 goto datacheck; 1051 case Opt_data_writeback: 1052 data_opt = EXT4_MOUNT_WRITEBACK_DATA; 1053 datacheck: 1054 if (is_remount) { 1055 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS) 1056 != data_opt) { 1057 printk(KERN_ERR 1058 "EXT4-fs: cannot change data " 1059 "mode on remount\n"); 1060 return 0; 1061 } 1062 } else { 1063 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS; 1064 sbi->s_mount_opt |= data_opt; 1065 } 1066 break; 1067 #ifdef CONFIG_QUOTA 1068 case Opt_usrjquota: 1069 qtype = USRQUOTA; 1070 goto set_qf_name; 1071 case Opt_grpjquota: 1072 qtype = GRPQUOTA; 1073 set_qf_name: 1074 if (sb_any_quota_enabled(sb)) { 1075 printk(KERN_ERR 1076 "EXT4-fs: Cannot change journalled " 1077 "quota options when quota turned on.\n"); 1078 return 0; 1079 } 1080 qname = match_strdup(&args[0]); 1081 if (!qname) { 1082 printk(KERN_ERR 1083 "EXT4-fs: not enough memory for " 1084 "storing quotafile name.\n"); 1085 return 0; 1086 } 1087 if (sbi->s_qf_names[qtype] && 1088 strcmp(sbi->s_qf_names[qtype], qname)) { 1089 printk(KERN_ERR 1090 "EXT4-fs: %s quota file already " 1091 "specified.\n", QTYPE2NAME(qtype)); 1092 kfree(qname); 1093 return 0; 1094 } 1095 sbi->s_qf_names[qtype] = qname; 1096 if (strchr(sbi->s_qf_names[qtype], '/')) { 1097 printk(KERN_ERR 1098 "EXT4-fs: quotafile must be on " 1099 "filesystem root.\n"); 1100 kfree(sbi->s_qf_names[qtype]); 1101 sbi->s_qf_names[qtype] = NULL; 1102 return 0; 1103 } 1104 set_opt(sbi->s_mount_opt, QUOTA); 1105 break; 1106 case Opt_offusrjquota: 1107 qtype = USRQUOTA; 1108 goto clear_qf_name; 1109 case Opt_offgrpjquota: 1110 qtype = GRPQUOTA; 1111 clear_qf_name: 1112 if (sb_any_quota_enabled(sb)) { 1113 printk(KERN_ERR "EXT4-fs: Cannot change " 1114 "journalled quota options when " 1115 "quota turned on.\n"); 1116 return 0; 1117 } 1118 /* 1119 * The space will be released later when all options 1120 * are confirmed to be correct 1121 */ 1122 sbi->s_qf_names[qtype] = NULL; 1123 break; 1124 case Opt_jqfmt_vfsold: 1125 sbi->s_jquota_fmt = QFMT_VFS_OLD; 1126 break; 1127 case Opt_jqfmt_vfsv0: 1128 sbi->s_jquota_fmt = QFMT_VFS_V0; 1129 break; 1130 case Opt_quota: 1131 case Opt_usrquota: 1132 set_opt(sbi->s_mount_opt, QUOTA); 1133 set_opt(sbi->s_mount_opt, USRQUOTA); 1134 break; 1135 case Opt_grpquota: 1136 set_opt(sbi->s_mount_opt, QUOTA); 1137 set_opt(sbi->s_mount_opt, GRPQUOTA); 1138 break; 1139 case Opt_noquota: 1140 if (sb_any_quota_enabled(sb)) { 1141 printk(KERN_ERR "EXT4-fs: Cannot change quota " 1142 "options when quota turned on.\n"); 1143 return 0; 1144 } 1145 clear_opt(sbi->s_mount_opt, QUOTA); 1146 clear_opt(sbi->s_mount_opt, USRQUOTA); 1147 clear_opt(sbi->s_mount_opt, GRPQUOTA); 1148 break; 1149 #else 1150 case Opt_quota: 1151 case Opt_usrquota: 1152 case Opt_grpquota: 1153 case Opt_usrjquota: 1154 case Opt_grpjquota: 1155 case Opt_offusrjquota: 1156 case Opt_offgrpjquota: 1157 case Opt_jqfmt_vfsold: 1158 case Opt_jqfmt_vfsv0: 1159 printk(KERN_ERR 1160 "EXT4-fs: journalled quota options not " 1161 "supported.\n"); 1162 break; 1163 case Opt_noquota: 1164 break; 1165 #endif 1166 case Opt_abort: 1167 set_opt(sbi->s_mount_opt, ABORT); 1168 break; 1169 case Opt_barrier: 1170 if (match_int(&args[0], &option)) 1171 return 0; 1172 if (option) 1173 set_opt(sbi->s_mount_opt, BARRIER); 1174 else 1175 clear_opt(sbi->s_mount_opt, BARRIER); 1176 break; 1177 case Opt_ignore: 1178 break; 1179 case Opt_resize: 1180 if (!is_remount) { 1181 printk("EXT4-fs: resize option only available " 1182 "for remount\n"); 1183 return 0; 1184 } 1185 if (match_int(&args[0], &option) != 0) 1186 return 0; 1187 *n_blocks_count = option; 1188 break; 1189 case Opt_nobh: 1190 set_opt(sbi->s_mount_opt, NOBH); 1191 break; 1192 case Opt_bh: 1193 clear_opt(sbi->s_mount_opt, NOBH); 1194 break; 1195 case Opt_extents: 1196 set_opt (sbi->s_mount_opt, EXTENTS); 1197 break; 1198 case Opt_noextents: 1199 clear_opt (sbi->s_mount_opt, EXTENTS); 1200 break; 1201 default: 1202 printk (KERN_ERR 1203 "EXT4-fs: Unrecognized mount option \"%s\" " 1204 "or missing value\n", p); 1205 return 0; 1206 } 1207 } 1208 #ifdef CONFIG_QUOTA 1209 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { 1210 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) && 1211 sbi->s_qf_names[USRQUOTA]) 1212 clear_opt(sbi->s_mount_opt, USRQUOTA); 1213 1214 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) && 1215 sbi->s_qf_names[GRPQUOTA]) 1216 clear_opt(sbi->s_mount_opt, GRPQUOTA); 1217 1218 if ((sbi->s_qf_names[USRQUOTA] && 1219 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) || 1220 (sbi->s_qf_names[GRPQUOTA] && 1221 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) { 1222 printk(KERN_ERR "EXT4-fs: old and new quota " 1223 "format mixing.\n"); 1224 return 0; 1225 } 1226 1227 if (!sbi->s_jquota_fmt) { 1228 printk(KERN_ERR "EXT4-fs: journalled quota format " 1229 "not specified.\n"); 1230 return 0; 1231 } 1232 } else { 1233 if (sbi->s_jquota_fmt) { 1234 printk(KERN_ERR "EXT4-fs: journalled quota format " 1235 "specified with no journalling " 1236 "enabled.\n"); 1237 return 0; 1238 } 1239 } 1240 #endif 1241 return 1; 1242 } 1243 1244 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, 1245 int read_only) 1246 { 1247 struct ext4_sb_info *sbi = EXT4_SB(sb); 1248 int res = 0; 1249 1250 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { 1251 printk (KERN_ERR "EXT4-fs warning: revision level too high, " 1252 "forcing read-only mode\n"); 1253 res = MS_RDONLY; 1254 } 1255 if (read_only) 1256 return res; 1257 if (!(sbi->s_mount_state & EXT4_VALID_FS)) 1258 printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, " 1259 "running e2fsck is recommended\n"); 1260 else if ((sbi->s_mount_state & EXT4_ERROR_FS)) 1261 printk (KERN_WARNING 1262 "EXT4-fs warning: mounting fs with errors, " 1263 "running e2fsck is recommended\n"); 1264 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 1265 le16_to_cpu(es->s_mnt_count) >= 1266 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 1267 printk (KERN_WARNING 1268 "EXT4-fs warning: maximal mount count reached, " 1269 "running e2fsck is recommended\n"); 1270 else if (le32_to_cpu(es->s_checkinterval) && 1271 (le32_to_cpu(es->s_lastcheck) + 1272 le32_to_cpu(es->s_checkinterval) <= get_seconds())) 1273 printk (KERN_WARNING 1274 "EXT4-fs warning: checktime reached, " 1275 "running e2fsck is recommended\n"); 1276 #if 0 1277 /* @@@ We _will_ want to clear the valid bit if we find 1278 * inconsistencies, to force a fsck at reboot. But for 1279 * a plain journaled filesystem we can keep it set as 1280 * valid forever! :) 1281 */ 1282 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS); 1283 #endif 1284 if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) 1285 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); 1286 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1); 1287 es->s_mtime = cpu_to_le32(get_seconds()); 1288 ext4_update_dynamic_rev(sb); 1289 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 1290 1291 ext4_commit_super(sb, es, 1); 1292 if (test_opt(sb, DEBUG)) 1293 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, " 1294 "bpg=%lu, ipg=%lu, mo=%04lx]\n", 1295 sb->s_blocksize, 1296 sbi->s_groups_count, 1297 EXT4_BLOCKS_PER_GROUP(sb), 1298 EXT4_INODES_PER_GROUP(sb), 1299 sbi->s_mount_opt); 1300 1301 printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id); 1302 if (EXT4_SB(sb)->s_journal->j_inode == NULL) { 1303 char b[BDEVNAME_SIZE]; 1304 1305 printk("external journal on %s\n", 1306 bdevname(EXT4_SB(sb)->s_journal->j_dev, b)); 1307 } else { 1308 printk("internal journal\n"); 1309 } 1310 return res; 1311 } 1312 1313 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group, 1314 struct ext4_group_desc *gdp) 1315 { 1316 __u16 crc = 0; 1317 1318 if (sbi->s_es->s_feature_ro_compat & 1319 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { 1320 int offset = offsetof(struct ext4_group_desc, bg_checksum); 1321 __le32 le_group = cpu_to_le32(block_group); 1322 1323 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); 1324 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); 1325 crc = crc16(crc, (__u8 *)gdp, offset); 1326 offset += sizeof(gdp->bg_checksum); /* skip checksum */ 1327 /* for checksum of struct ext4_group_desc do the rest...*/ 1328 if ((sbi->s_es->s_feature_incompat & 1329 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) && 1330 offset < le16_to_cpu(sbi->s_es->s_desc_size)) 1331 crc = crc16(crc, (__u8 *)gdp + offset, 1332 le16_to_cpu(sbi->s_es->s_desc_size) - 1333 offset); 1334 } 1335 1336 return cpu_to_le16(crc); 1337 } 1338 1339 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group, 1340 struct ext4_group_desc *gdp) 1341 { 1342 if ((sbi->s_es->s_feature_ro_compat & 1343 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) && 1344 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp))) 1345 return 0; 1346 1347 return 1; 1348 } 1349 1350 /* Called at mount-time, super-block is locked */ 1351 static int ext4_check_descriptors (struct super_block * sb) 1352 { 1353 struct ext4_sb_info *sbi = EXT4_SB(sb); 1354 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); 1355 ext4_fsblk_t last_block; 1356 ext4_fsblk_t block_bitmap; 1357 ext4_fsblk_t inode_bitmap; 1358 ext4_fsblk_t inode_table; 1359 struct ext4_group_desc * gdp = NULL; 1360 int desc_block = 0; 1361 int flexbg_flag = 0; 1362 int i; 1363 1364 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) 1365 flexbg_flag = 1; 1366 1367 ext4_debug ("Checking group descriptors"); 1368 1369 for (i = 0; i < sbi->s_groups_count; i++) 1370 { 1371 if (i == sbi->s_groups_count - 1 || flexbg_flag) 1372 last_block = ext4_blocks_count(sbi->s_es) - 1; 1373 else 1374 last_block = first_block + 1375 (EXT4_BLOCKS_PER_GROUP(sb) - 1); 1376 1377 if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0) 1378 gdp = (struct ext4_group_desc *) 1379 sbi->s_group_desc[desc_block++]->b_data; 1380 block_bitmap = ext4_block_bitmap(sb, gdp); 1381 if (block_bitmap < first_block || block_bitmap > last_block) 1382 { 1383 ext4_error (sb, "ext4_check_descriptors", 1384 "Block bitmap for group %d" 1385 " not in group (block %llu)!", 1386 i, block_bitmap); 1387 return 0; 1388 } 1389 inode_bitmap = ext4_inode_bitmap(sb, gdp); 1390 if (inode_bitmap < first_block || inode_bitmap > last_block) 1391 { 1392 ext4_error (sb, "ext4_check_descriptors", 1393 "Inode bitmap for group %d" 1394 " not in group (block %llu)!", 1395 i, inode_bitmap); 1396 return 0; 1397 } 1398 inode_table = ext4_inode_table(sb, gdp); 1399 if (inode_table < first_block || 1400 inode_table + sbi->s_itb_per_group - 1 > last_block) 1401 { 1402 ext4_error (sb, "ext4_check_descriptors", 1403 "Inode table for group %d" 1404 " not in group (block %llu)!", 1405 i, inode_table); 1406 return 0; 1407 } 1408 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) { 1409 ext4_error(sb, __FUNCTION__, 1410 "Checksum for group %d failed (%u!=%u)\n", i, 1411 le16_to_cpu(ext4_group_desc_csum(sbi, i, 1412 gdp)), 1413 le16_to_cpu(gdp->bg_checksum)); 1414 return 0; 1415 } 1416 if (!flexbg_flag) 1417 first_block += EXT4_BLOCKS_PER_GROUP(sb); 1418 gdp = (struct ext4_group_desc *) 1419 ((__u8 *)gdp + EXT4_DESC_SIZE(sb)); 1420 } 1421 1422 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb)); 1423 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb)); 1424 return 1; 1425 } 1426 1427 1428 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at 1429 * the superblock) which were deleted from all directories, but held open by 1430 * a process at the time of a crash. We walk the list and try to delete these 1431 * inodes at recovery time (only with a read-write filesystem). 1432 * 1433 * In order to keep the orphan inode chain consistent during traversal (in 1434 * case of crash during recovery), we link each inode into the superblock 1435 * orphan list_head and handle it the same way as an inode deletion during 1436 * normal operation (which journals the operations for us). 1437 * 1438 * We only do an iget() and an iput() on each inode, which is very safe if we 1439 * accidentally point at an in-use or already deleted inode. The worst that 1440 * can happen in this case is that we get a "bit already cleared" message from 1441 * ext4_free_inode(). The only reason we would point at a wrong inode is if 1442 * e2fsck was run on this filesystem, and it must have already done the orphan 1443 * inode cleanup for us, so we can safely abort without any further action. 1444 */ 1445 static void ext4_orphan_cleanup (struct super_block * sb, 1446 struct ext4_super_block * es) 1447 { 1448 unsigned int s_flags = sb->s_flags; 1449 int nr_orphans = 0, nr_truncates = 0; 1450 #ifdef CONFIG_QUOTA 1451 int i; 1452 #endif 1453 if (!es->s_last_orphan) { 1454 jbd_debug(4, "no orphan inodes to clean up\n"); 1455 return; 1456 } 1457 1458 if (bdev_read_only(sb->s_bdev)) { 1459 printk(KERN_ERR "EXT4-fs: write access " 1460 "unavailable, skipping orphan cleanup.\n"); 1461 return; 1462 } 1463 1464 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { 1465 if (es->s_last_orphan) 1466 jbd_debug(1, "Errors on filesystem, " 1467 "clearing orphan list.\n"); 1468 es->s_last_orphan = 0; 1469 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); 1470 return; 1471 } 1472 1473 if (s_flags & MS_RDONLY) { 1474 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n", 1475 sb->s_id); 1476 sb->s_flags &= ~MS_RDONLY; 1477 } 1478 #ifdef CONFIG_QUOTA 1479 /* Needed for iput() to work correctly and not trash data */ 1480 sb->s_flags |= MS_ACTIVE; 1481 /* Turn on quotas so that they are updated correctly */ 1482 for (i = 0; i < MAXQUOTAS; i++) { 1483 if (EXT4_SB(sb)->s_qf_names[i]) { 1484 int ret = ext4_quota_on_mount(sb, i); 1485 if (ret < 0) 1486 printk(KERN_ERR 1487 "EXT4-fs: Cannot turn on journalled " 1488 "quota: error %d\n", ret); 1489 } 1490 } 1491 #endif 1492 1493 while (es->s_last_orphan) { 1494 struct inode *inode; 1495 1496 if (!(inode = 1497 ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) { 1498 es->s_last_orphan = 0; 1499 break; 1500 } 1501 1502 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); 1503 DQUOT_INIT(inode); 1504 if (inode->i_nlink) { 1505 printk(KERN_DEBUG 1506 "%s: truncating inode %lu to %Ld bytes\n", 1507 __FUNCTION__, inode->i_ino, inode->i_size); 1508 jbd_debug(2, "truncating inode %lu to %Ld bytes\n", 1509 inode->i_ino, inode->i_size); 1510 ext4_truncate(inode); 1511 nr_truncates++; 1512 } else { 1513 printk(KERN_DEBUG 1514 "%s: deleting unreferenced inode %lu\n", 1515 __FUNCTION__, inode->i_ino); 1516 jbd_debug(2, "deleting unreferenced inode %lu\n", 1517 inode->i_ino); 1518 nr_orphans++; 1519 } 1520 iput(inode); /* The delete magic happens here! */ 1521 } 1522 1523 #define PLURAL(x) (x), ((x)==1) ? "" : "s" 1524 1525 if (nr_orphans) 1526 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n", 1527 sb->s_id, PLURAL(nr_orphans)); 1528 if (nr_truncates) 1529 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n", 1530 sb->s_id, PLURAL(nr_truncates)); 1531 #ifdef CONFIG_QUOTA 1532 /* Turn quotas off */ 1533 for (i = 0; i < MAXQUOTAS; i++) { 1534 if (sb_dqopt(sb)->files[i]) 1535 vfs_quota_off(sb, i); 1536 } 1537 #endif 1538 sb->s_flags = s_flags; /* Restore MS_RDONLY status */ 1539 } 1540 1541 /* 1542 * Maximal file size. There is a direct, and {,double-,triple-}indirect 1543 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. 1544 * We need to be 1 filesystem block less than the 2^32 sector limit. 1545 */ 1546 static loff_t ext4_max_size(int bits) 1547 { 1548 loff_t res = EXT4_NDIR_BLOCKS; 1549 /* This constant is calculated to be the largest file size for a 1550 * dense, 4k-blocksize file such that the total number of 1551 * sectors in the file, including data and all indirect blocks, 1552 * does not exceed 2^32. */ 1553 const loff_t upper_limit = 0x1ff7fffd000LL; 1554 1555 res += 1LL << (bits-2); 1556 res += 1LL << (2*(bits-2)); 1557 res += 1LL << (3*(bits-2)); 1558 res <<= bits; 1559 if (res > upper_limit) 1560 res = upper_limit; 1561 return res; 1562 } 1563 1564 static ext4_fsblk_t descriptor_loc(struct super_block *sb, 1565 ext4_fsblk_t logical_sb_block, int nr) 1566 { 1567 struct ext4_sb_info *sbi = EXT4_SB(sb); 1568 unsigned long bg, first_meta_bg; 1569 int has_super = 0; 1570 1571 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 1572 1573 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || 1574 nr < first_meta_bg) 1575 return logical_sb_block + nr + 1; 1576 bg = sbi->s_desc_per_block * nr; 1577 if (ext4_bg_has_super(sb, bg)) 1578 has_super = 1; 1579 return (has_super + ext4_group_first_block_no(sb, bg)); 1580 } 1581 1582 1583 static int ext4_fill_super (struct super_block *sb, void *data, int silent) 1584 { 1585 struct buffer_head * bh; 1586 struct ext4_super_block *es = NULL; 1587 struct ext4_sb_info *sbi; 1588 ext4_fsblk_t block; 1589 ext4_fsblk_t sb_block = get_sb_block(&data); 1590 ext4_fsblk_t logical_sb_block; 1591 unsigned long offset = 0; 1592 unsigned int journal_inum = 0; 1593 unsigned long journal_devnum = 0; 1594 unsigned long def_mount_opts; 1595 struct inode *root; 1596 int blocksize; 1597 int hblock; 1598 int db_count; 1599 int i; 1600 int needs_recovery; 1601 __le32 features; 1602 __u64 blocks_count; 1603 int err; 1604 1605 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 1606 if (!sbi) 1607 return -ENOMEM; 1608 sb->s_fs_info = sbi; 1609 sbi->s_mount_opt = 0; 1610 sbi->s_resuid = EXT4_DEF_RESUID; 1611 sbi->s_resgid = EXT4_DEF_RESGID; 1612 sbi->s_sb_block = sb_block; 1613 1614 unlock_kernel(); 1615 1616 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); 1617 if (!blocksize) { 1618 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n"); 1619 goto out_fail; 1620 } 1621 1622 /* 1623 * The ext4 superblock will not be buffer aligned for other than 1kB 1624 * block sizes. We need to calculate the offset from buffer start. 1625 */ 1626 if (blocksize != EXT4_MIN_BLOCK_SIZE) { 1627 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 1628 offset = do_div(logical_sb_block, blocksize); 1629 } else { 1630 logical_sb_block = sb_block; 1631 } 1632 1633 if (!(bh = sb_bread(sb, logical_sb_block))) { 1634 printk (KERN_ERR "EXT4-fs: unable to read superblock\n"); 1635 goto out_fail; 1636 } 1637 /* 1638 * Note: s_es must be initialized as soon as possible because 1639 * some ext4 macro-instructions depend on its value 1640 */ 1641 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 1642 sbi->s_es = es; 1643 sb->s_magic = le16_to_cpu(es->s_magic); 1644 if (sb->s_magic != EXT4_SUPER_MAGIC) 1645 goto cantfind_ext4; 1646 1647 /* Set defaults before we parse the mount options */ 1648 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 1649 if (def_mount_opts & EXT4_DEFM_DEBUG) 1650 set_opt(sbi->s_mount_opt, DEBUG); 1651 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) 1652 set_opt(sbi->s_mount_opt, GRPID); 1653 if (def_mount_opts & EXT4_DEFM_UID16) 1654 set_opt(sbi->s_mount_opt, NO_UID32); 1655 #ifdef CONFIG_EXT4DEV_FS_XATTR 1656 if (def_mount_opts & EXT4_DEFM_XATTR_USER) 1657 set_opt(sbi->s_mount_opt, XATTR_USER); 1658 #endif 1659 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL 1660 if (def_mount_opts & EXT4_DEFM_ACL) 1661 set_opt(sbi->s_mount_opt, POSIX_ACL); 1662 #endif 1663 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) 1664 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA; 1665 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) 1666 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA; 1667 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) 1668 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA; 1669 1670 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) 1671 set_opt(sbi->s_mount_opt, ERRORS_PANIC); 1672 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_RO) 1673 set_opt(sbi->s_mount_opt, ERRORS_RO); 1674 else 1675 set_opt(sbi->s_mount_opt, ERRORS_CONT); 1676 1677 sbi->s_resuid = le16_to_cpu(es->s_def_resuid); 1678 sbi->s_resgid = le16_to_cpu(es->s_def_resgid); 1679 1680 set_opt(sbi->s_mount_opt, RESERVATION); 1681 1682 /* 1683 * turn on extents feature by default in ext4 filesystem 1684 * User -o noextents to turn it off 1685 */ 1686 set_opt(sbi->s_mount_opt, EXTENTS); 1687 1688 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum, 1689 NULL, 0)) 1690 goto failed_mount; 1691 1692 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 1693 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 1694 1695 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && 1696 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || 1697 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 1698 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) 1699 printk(KERN_WARNING 1700 "EXT4-fs warning: feature flags set on rev 0 fs, " 1701 "running e2fsck is recommended\n"); 1702 /* 1703 * Check feature flags regardless of the revision level, since we 1704 * previously didn't change the revision level when setting the flags, 1705 * so there is a chance incompat flags are set on a rev 0 filesystem. 1706 */ 1707 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP); 1708 if (features) { 1709 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of " 1710 "unsupported optional features (%x).\n", 1711 sb->s_id, le32_to_cpu(features)); 1712 goto failed_mount; 1713 } 1714 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP); 1715 if (!(sb->s_flags & MS_RDONLY) && features) { 1716 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of " 1717 "unsupported optional features (%x).\n", 1718 sb->s_id, le32_to_cpu(features)); 1719 goto failed_mount; 1720 } 1721 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); 1722 1723 if (blocksize < EXT4_MIN_BLOCK_SIZE || 1724 blocksize > EXT4_MAX_BLOCK_SIZE) { 1725 printk(KERN_ERR 1726 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n", 1727 blocksize, sb->s_id); 1728 goto failed_mount; 1729 } 1730 1731 hblock = bdev_hardsect_size(sb->s_bdev); 1732 if (sb->s_blocksize != blocksize) { 1733 /* 1734 * Make sure the blocksize for the filesystem is larger 1735 * than the hardware sectorsize for the machine. 1736 */ 1737 if (blocksize < hblock) { 1738 printk(KERN_ERR "EXT4-fs: blocksize %d too small for " 1739 "device blocksize %d.\n", blocksize, hblock); 1740 goto failed_mount; 1741 } 1742 1743 brelse (bh); 1744 sb_set_blocksize(sb, blocksize); 1745 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; 1746 offset = do_div(logical_sb_block, blocksize); 1747 bh = sb_bread(sb, logical_sb_block); 1748 if (!bh) { 1749 printk(KERN_ERR 1750 "EXT4-fs: Can't read superblock on 2nd try.\n"); 1751 goto failed_mount; 1752 } 1753 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); 1754 sbi->s_es = es; 1755 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { 1756 printk (KERN_ERR 1757 "EXT4-fs: Magic mismatch, very weird !\n"); 1758 goto failed_mount; 1759 } 1760 } 1761 1762 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits); 1763 1764 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { 1765 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; 1766 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; 1767 } else { 1768 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 1769 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 1770 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || 1771 (!is_power_of_2(sbi->s_inode_size)) || 1772 (sbi->s_inode_size > blocksize)) { 1773 printk (KERN_ERR 1774 "EXT4-fs: unsupported inode size: %d\n", 1775 sbi->s_inode_size); 1776 goto failed_mount; 1777 } 1778 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) 1779 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); 1780 } 1781 sbi->s_desc_size = le16_to_cpu(es->s_desc_size); 1782 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { 1783 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || 1784 sbi->s_desc_size > EXT4_MAX_DESC_SIZE || 1785 !is_power_of_2(sbi->s_desc_size)) { 1786 printk(KERN_ERR 1787 "EXT4-fs: unsupported descriptor size %lu\n", 1788 sbi->s_desc_size); 1789 goto failed_mount; 1790 } 1791 } else 1792 sbi->s_desc_size = EXT4_MIN_DESC_SIZE; 1793 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 1794 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 1795 if (EXT4_INODE_SIZE(sb) == 0) 1796 goto cantfind_ext4; 1797 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); 1798 if (sbi->s_inodes_per_block == 0) 1799 goto cantfind_ext4; 1800 sbi->s_itb_per_group = sbi->s_inodes_per_group / 1801 sbi->s_inodes_per_block; 1802 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); 1803 sbi->s_sbh = bh; 1804 sbi->s_mount_state = le16_to_cpu(es->s_state); 1805 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); 1806 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); 1807 for (i=0; i < 4; i++) 1808 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); 1809 sbi->s_def_hash_version = es->s_def_hash_version; 1810 1811 if (sbi->s_blocks_per_group > blocksize * 8) { 1812 printk (KERN_ERR 1813 "EXT4-fs: #blocks per group too big: %lu\n", 1814 sbi->s_blocks_per_group); 1815 goto failed_mount; 1816 } 1817 if (sbi->s_inodes_per_group > blocksize * 8) { 1818 printk (KERN_ERR 1819 "EXT4-fs: #inodes per group too big: %lu\n", 1820 sbi->s_inodes_per_group); 1821 goto failed_mount; 1822 } 1823 1824 if (ext4_blocks_count(es) > 1825 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { 1826 printk(KERN_ERR "EXT4-fs: filesystem on %s:" 1827 " too large to mount safely\n", sb->s_id); 1828 if (sizeof(sector_t) < 8) 1829 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not " 1830 "enabled\n"); 1831 goto failed_mount; 1832 } 1833 1834 if (EXT4_BLOCKS_PER_GROUP(sb) == 0) 1835 goto cantfind_ext4; 1836 blocks_count = (ext4_blocks_count(es) - 1837 le32_to_cpu(es->s_first_data_block) + 1838 EXT4_BLOCKS_PER_GROUP(sb) - 1); 1839 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); 1840 sbi->s_groups_count = blocks_count; 1841 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / 1842 EXT4_DESC_PER_BLOCK(sb); 1843 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *), 1844 GFP_KERNEL); 1845 if (sbi->s_group_desc == NULL) { 1846 printk (KERN_ERR "EXT4-fs: not enough memory\n"); 1847 goto failed_mount; 1848 } 1849 1850 bgl_lock_init(&sbi->s_blockgroup_lock); 1851 1852 for (i = 0; i < db_count; i++) { 1853 block = descriptor_loc(sb, logical_sb_block, i); 1854 sbi->s_group_desc[i] = sb_bread(sb, block); 1855 if (!sbi->s_group_desc[i]) { 1856 printk (KERN_ERR "EXT4-fs: " 1857 "can't read group descriptor %d\n", i); 1858 db_count = i; 1859 goto failed_mount2; 1860 } 1861 } 1862 if (!ext4_check_descriptors (sb)) { 1863 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n"); 1864 goto failed_mount2; 1865 } 1866 sbi->s_gdb_count = db_count; 1867 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 1868 spin_lock_init(&sbi->s_next_gen_lock); 1869 1870 err = percpu_counter_init(&sbi->s_freeblocks_counter, 1871 ext4_count_free_blocks(sb)); 1872 if (!err) { 1873 err = percpu_counter_init(&sbi->s_freeinodes_counter, 1874 ext4_count_free_inodes(sb)); 1875 } 1876 if (!err) { 1877 err = percpu_counter_init(&sbi->s_dirs_counter, 1878 ext4_count_dirs(sb)); 1879 } 1880 if (err) { 1881 printk(KERN_ERR "EXT4-fs: insufficient memory\n"); 1882 goto failed_mount3; 1883 } 1884 1885 /* per fileystem reservation list head & lock */ 1886 spin_lock_init(&sbi->s_rsv_window_lock); 1887 sbi->s_rsv_window_root = RB_ROOT; 1888 /* Add a single, static dummy reservation to the start of the 1889 * reservation window list --- it gives us a placeholder for 1890 * append-at-start-of-list which makes the allocation logic 1891 * _much_ simpler. */ 1892 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; 1893 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; 1894 sbi->s_rsv_window_head.rsv_alloc_hit = 0; 1895 sbi->s_rsv_window_head.rsv_goal_size = 0; 1896 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head); 1897 1898 /* 1899 * set up enough so that it can read an inode 1900 */ 1901 sb->s_op = &ext4_sops; 1902 sb->s_export_op = &ext4_export_ops; 1903 sb->s_xattr = ext4_xattr_handlers; 1904 #ifdef CONFIG_QUOTA 1905 sb->s_qcop = &ext4_qctl_operations; 1906 sb->dq_op = &ext4_quota_operations; 1907 #endif 1908 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ 1909 1910 sb->s_root = NULL; 1911 1912 needs_recovery = (es->s_last_orphan != 0 || 1913 EXT4_HAS_INCOMPAT_FEATURE(sb, 1914 EXT4_FEATURE_INCOMPAT_RECOVER)); 1915 1916 /* 1917 * The first inode we look at is the journal inode. Don't try 1918 * root first: it may be modified in the journal! 1919 */ 1920 if (!test_opt(sb, NOLOAD) && 1921 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { 1922 if (ext4_load_journal(sb, es, journal_devnum)) 1923 goto failed_mount3; 1924 } else if (journal_inum) { 1925 if (ext4_create_journal(sb, es, journal_inum)) 1926 goto failed_mount3; 1927 } else { 1928 if (!silent) 1929 printk (KERN_ERR 1930 "ext4: No journal on filesystem on %s\n", 1931 sb->s_id); 1932 goto failed_mount3; 1933 } 1934 1935 if (ext4_blocks_count(es) > 0xffffffffULL && 1936 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, 1937 JBD2_FEATURE_INCOMPAT_64BIT)) { 1938 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n"); 1939 goto failed_mount4; 1940 } 1941 1942 /* We have now updated the journal if required, so we can 1943 * validate the data journaling mode. */ 1944 switch (test_opt(sb, DATA_FLAGS)) { 1945 case 0: 1946 /* No mode set, assume a default based on the journal 1947 * capabilities: ORDERED_DATA if the journal can 1948 * cope, else JOURNAL_DATA 1949 */ 1950 if (jbd2_journal_check_available_features 1951 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) 1952 set_opt(sbi->s_mount_opt, ORDERED_DATA); 1953 else 1954 set_opt(sbi->s_mount_opt, JOURNAL_DATA); 1955 break; 1956 1957 case EXT4_MOUNT_ORDERED_DATA: 1958 case EXT4_MOUNT_WRITEBACK_DATA: 1959 if (!jbd2_journal_check_available_features 1960 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { 1961 printk(KERN_ERR "EXT4-fs: Journal does not support " 1962 "requested data journaling mode\n"); 1963 goto failed_mount4; 1964 } 1965 default: 1966 break; 1967 } 1968 1969 if (test_opt(sb, NOBH)) { 1970 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) { 1971 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - " 1972 "its supported only with writeback mode\n"); 1973 clear_opt(sbi->s_mount_opt, NOBH); 1974 } 1975 } 1976 /* 1977 * The jbd2_journal_load will have done any necessary log recovery, 1978 * so we can safely mount the rest of the filesystem now. 1979 */ 1980 1981 root = iget(sb, EXT4_ROOT_INO); 1982 sb->s_root = d_alloc_root(root); 1983 if (!sb->s_root) { 1984 printk(KERN_ERR "EXT4-fs: get root inode failed\n"); 1985 iput(root); 1986 goto failed_mount4; 1987 } 1988 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 1989 dput(sb->s_root); 1990 sb->s_root = NULL; 1991 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n"); 1992 goto failed_mount4; 1993 } 1994 1995 ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY); 1996 1997 /* determine the minimum size of new large inodes, if present */ 1998 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { 1999 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 2000 EXT4_GOOD_OLD_INODE_SIZE; 2001 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 2002 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { 2003 if (sbi->s_want_extra_isize < 2004 le16_to_cpu(es->s_want_extra_isize)) 2005 sbi->s_want_extra_isize = 2006 le16_to_cpu(es->s_want_extra_isize); 2007 if (sbi->s_want_extra_isize < 2008 le16_to_cpu(es->s_min_extra_isize)) 2009 sbi->s_want_extra_isize = 2010 le16_to_cpu(es->s_min_extra_isize); 2011 } 2012 } 2013 /* Check if enough inode space is available */ 2014 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > 2015 sbi->s_inode_size) { 2016 sbi->s_want_extra_isize = sizeof(struct ext4_inode) - 2017 EXT4_GOOD_OLD_INODE_SIZE; 2018 printk(KERN_INFO "EXT4-fs: required extra inode space not" 2019 "available.\n"); 2020 } 2021 2022 /* 2023 * akpm: core read_super() calls in here with the superblock locked. 2024 * That deadlocks, because orphan cleanup needs to lock the superblock 2025 * in numerous places. Here we just pop the lock - it's relatively 2026 * harmless, because we are now ready to accept write_super() requests, 2027 * and aviro says that's the only reason for hanging onto the 2028 * superblock lock. 2029 */ 2030 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; 2031 ext4_orphan_cleanup(sb, es); 2032 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; 2033 if (needs_recovery) 2034 printk (KERN_INFO "EXT4-fs: recovery complete.\n"); 2035 ext4_mark_recovery_complete(sb, es); 2036 printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n", 2037 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal": 2038 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered": 2039 "writeback"); 2040 2041 ext4_ext_init(sb); 2042 2043 lock_kernel(); 2044 return 0; 2045 2046 cantfind_ext4: 2047 if (!silent) 2048 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n", 2049 sb->s_id); 2050 goto failed_mount; 2051 2052 failed_mount4: 2053 jbd2_journal_destroy(sbi->s_journal); 2054 failed_mount3: 2055 percpu_counter_destroy(&sbi->s_freeblocks_counter); 2056 percpu_counter_destroy(&sbi->s_freeinodes_counter); 2057 percpu_counter_destroy(&sbi->s_dirs_counter); 2058 failed_mount2: 2059 for (i = 0; i < db_count; i++) 2060 brelse(sbi->s_group_desc[i]); 2061 kfree(sbi->s_group_desc); 2062 failed_mount: 2063 #ifdef CONFIG_QUOTA 2064 for (i = 0; i < MAXQUOTAS; i++) 2065 kfree(sbi->s_qf_names[i]); 2066 #endif 2067 ext4_blkdev_remove(sbi); 2068 brelse(bh); 2069 out_fail: 2070 sb->s_fs_info = NULL; 2071 kfree(sbi); 2072 lock_kernel(); 2073 return -EINVAL; 2074 } 2075 2076 /* 2077 * Setup any per-fs journal parameters now. We'll do this both on 2078 * initial mount, once the journal has been initialised but before we've 2079 * done any recovery; and again on any subsequent remount. 2080 */ 2081 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) 2082 { 2083 struct ext4_sb_info *sbi = EXT4_SB(sb); 2084 2085 if (sbi->s_commit_interval) 2086 journal->j_commit_interval = sbi->s_commit_interval; 2087 /* We could also set up an ext4-specific default for the commit 2088 * interval here, but for now we'll just fall back to the jbd 2089 * default. */ 2090 2091 spin_lock(&journal->j_state_lock); 2092 if (test_opt(sb, BARRIER)) 2093 journal->j_flags |= JBD2_BARRIER; 2094 else 2095 journal->j_flags &= ~JBD2_BARRIER; 2096 spin_unlock(&journal->j_state_lock); 2097 } 2098 2099 static journal_t *ext4_get_journal(struct super_block *sb, 2100 unsigned int journal_inum) 2101 { 2102 struct inode *journal_inode; 2103 journal_t *journal; 2104 2105 /* First, test for the existence of a valid inode on disk. Bad 2106 * things happen if we iget() an unused inode, as the subsequent 2107 * iput() will try to delete it. */ 2108 2109 journal_inode = iget(sb, journal_inum); 2110 if (!journal_inode) { 2111 printk(KERN_ERR "EXT4-fs: no journal found.\n"); 2112 return NULL; 2113 } 2114 if (!journal_inode->i_nlink) { 2115 make_bad_inode(journal_inode); 2116 iput(journal_inode); 2117 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n"); 2118 return NULL; 2119 } 2120 2121 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n", 2122 journal_inode, journal_inode->i_size); 2123 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) { 2124 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n"); 2125 iput(journal_inode); 2126 return NULL; 2127 } 2128 2129 journal = jbd2_journal_init_inode(journal_inode); 2130 if (!journal) { 2131 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n"); 2132 iput(journal_inode); 2133 return NULL; 2134 } 2135 journal->j_private = sb; 2136 ext4_init_journal_params(sb, journal); 2137 return journal; 2138 } 2139 2140 static journal_t *ext4_get_dev_journal(struct super_block *sb, 2141 dev_t j_dev) 2142 { 2143 struct buffer_head * bh; 2144 journal_t *journal; 2145 ext4_fsblk_t start; 2146 ext4_fsblk_t len; 2147 int hblock, blocksize; 2148 ext4_fsblk_t sb_block; 2149 unsigned long offset; 2150 struct ext4_super_block * es; 2151 struct block_device *bdev; 2152 2153 bdev = ext4_blkdev_get(j_dev); 2154 if (bdev == NULL) 2155 return NULL; 2156 2157 if (bd_claim(bdev, sb)) { 2158 printk(KERN_ERR 2159 "EXT4: failed to claim external journal device.\n"); 2160 blkdev_put(bdev); 2161 return NULL; 2162 } 2163 2164 blocksize = sb->s_blocksize; 2165 hblock = bdev_hardsect_size(bdev); 2166 if (blocksize < hblock) { 2167 printk(KERN_ERR 2168 "EXT4-fs: blocksize too small for journal device.\n"); 2169 goto out_bdev; 2170 } 2171 2172 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; 2173 offset = EXT4_MIN_BLOCK_SIZE % blocksize; 2174 set_blocksize(bdev, blocksize); 2175 if (!(bh = __bread(bdev, sb_block, blocksize))) { 2176 printk(KERN_ERR "EXT4-fs: couldn't read superblock of " 2177 "external journal\n"); 2178 goto out_bdev; 2179 } 2180 2181 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); 2182 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || 2183 !(le32_to_cpu(es->s_feature_incompat) & 2184 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { 2185 printk(KERN_ERR "EXT4-fs: external journal has " 2186 "bad superblock\n"); 2187 brelse(bh); 2188 goto out_bdev; 2189 } 2190 2191 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { 2192 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n"); 2193 brelse(bh); 2194 goto out_bdev; 2195 } 2196 2197 len = ext4_blocks_count(es); 2198 start = sb_block + 1; 2199 brelse(bh); /* we're done with the superblock */ 2200 2201 journal = jbd2_journal_init_dev(bdev, sb->s_bdev, 2202 start, len, blocksize); 2203 if (!journal) { 2204 printk(KERN_ERR "EXT4-fs: failed to create device journal\n"); 2205 goto out_bdev; 2206 } 2207 journal->j_private = sb; 2208 ll_rw_block(READ, 1, &journal->j_sb_buffer); 2209 wait_on_buffer(journal->j_sb_buffer); 2210 if (!buffer_uptodate(journal->j_sb_buffer)) { 2211 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n"); 2212 goto out_journal; 2213 } 2214 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { 2215 printk(KERN_ERR "EXT4-fs: External journal has more than one " 2216 "user (unsupported) - %d\n", 2217 be32_to_cpu(journal->j_superblock->s_nr_users)); 2218 goto out_journal; 2219 } 2220 EXT4_SB(sb)->journal_bdev = bdev; 2221 ext4_init_journal_params(sb, journal); 2222 return journal; 2223 out_journal: 2224 jbd2_journal_destroy(journal); 2225 out_bdev: 2226 ext4_blkdev_put(bdev); 2227 return NULL; 2228 } 2229 2230 static int ext4_load_journal(struct super_block *sb, 2231 struct ext4_super_block *es, 2232 unsigned long journal_devnum) 2233 { 2234 journal_t *journal; 2235 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); 2236 dev_t journal_dev; 2237 int err = 0; 2238 int really_read_only; 2239 2240 if (journal_devnum && 2241 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 2242 printk(KERN_INFO "EXT4-fs: external journal device major/minor " 2243 "numbers have changed\n"); 2244 journal_dev = new_decode_dev(journal_devnum); 2245 } else 2246 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); 2247 2248 really_read_only = bdev_read_only(sb->s_bdev); 2249 2250 /* 2251 * Are we loading a blank journal or performing recovery after a 2252 * crash? For recovery, we need to check in advance whether we 2253 * can get read-write access to the device. 2254 */ 2255 2256 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { 2257 if (sb->s_flags & MS_RDONLY) { 2258 printk(KERN_INFO "EXT4-fs: INFO: recovery " 2259 "required on readonly filesystem.\n"); 2260 if (really_read_only) { 2261 printk(KERN_ERR "EXT4-fs: write access " 2262 "unavailable, cannot proceed.\n"); 2263 return -EROFS; 2264 } 2265 printk (KERN_INFO "EXT4-fs: write access will " 2266 "be enabled during recovery.\n"); 2267 } 2268 } 2269 2270 if (journal_inum && journal_dev) { 2271 printk(KERN_ERR "EXT4-fs: filesystem has both journal " 2272 "and inode journals!\n"); 2273 return -EINVAL; 2274 } 2275 2276 if (journal_inum) { 2277 if (!(journal = ext4_get_journal(sb, journal_inum))) 2278 return -EINVAL; 2279 } else { 2280 if (!(journal = ext4_get_dev_journal(sb, journal_dev))) 2281 return -EINVAL; 2282 } 2283 2284 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { 2285 err = jbd2_journal_update_format(journal); 2286 if (err) { 2287 printk(KERN_ERR "EXT4-fs: error updating journal.\n"); 2288 jbd2_journal_destroy(journal); 2289 return err; 2290 } 2291 } 2292 2293 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) 2294 err = jbd2_journal_wipe(journal, !really_read_only); 2295 if (!err) 2296 err = jbd2_journal_load(journal); 2297 2298 if (err) { 2299 printk(KERN_ERR "EXT4-fs: error loading journal.\n"); 2300 jbd2_journal_destroy(journal); 2301 return err; 2302 } 2303 2304 EXT4_SB(sb)->s_journal = journal; 2305 ext4_clear_journal_err(sb, es); 2306 2307 if (journal_devnum && 2308 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 2309 es->s_journal_dev = cpu_to_le32(journal_devnum); 2310 sb->s_dirt = 1; 2311 2312 /* Make sure we flush the recovery flag to disk. */ 2313 ext4_commit_super(sb, es, 1); 2314 } 2315 2316 return 0; 2317 } 2318 2319 static int ext4_create_journal(struct super_block * sb, 2320 struct ext4_super_block * es, 2321 unsigned int journal_inum) 2322 { 2323 journal_t *journal; 2324 int err; 2325 2326 if (sb->s_flags & MS_RDONLY) { 2327 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to " 2328 "create journal.\n"); 2329 return -EROFS; 2330 } 2331 2332 journal = ext4_get_journal(sb, journal_inum); 2333 if (!journal) 2334 return -EINVAL; 2335 2336 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n", 2337 journal_inum); 2338 2339 err = jbd2_journal_create(journal); 2340 if (err) { 2341 printk(KERN_ERR "EXT4-fs: error creating journal.\n"); 2342 jbd2_journal_destroy(journal); 2343 return -EIO; 2344 } 2345 2346 EXT4_SB(sb)->s_journal = journal; 2347 2348 ext4_update_dynamic_rev(sb); 2349 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2350 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL); 2351 2352 es->s_journal_inum = cpu_to_le32(journal_inum); 2353 sb->s_dirt = 1; 2354 2355 /* Make sure we flush the recovery flag to disk. */ 2356 ext4_commit_super(sb, es, 1); 2357 2358 return 0; 2359 } 2360 2361 static void ext4_commit_super (struct super_block * sb, 2362 struct ext4_super_block * es, 2363 int sync) 2364 { 2365 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; 2366 2367 if (!sbh) 2368 return; 2369 es->s_wtime = cpu_to_le32(get_seconds()); 2370 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb)); 2371 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb)); 2372 BUFFER_TRACE(sbh, "marking dirty"); 2373 mark_buffer_dirty(sbh); 2374 if (sync) 2375 sync_dirty_buffer(sbh); 2376 } 2377 2378 2379 /* 2380 * Have we just finished recovery? If so, and if we are mounting (or 2381 * remounting) the filesystem readonly, then we will end up with a 2382 * consistent fs on disk. Record that fact. 2383 */ 2384 static void ext4_mark_recovery_complete(struct super_block * sb, 2385 struct ext4_super_block * es) 2386 { 2387 journal_t *journal = EXT4_SB(sb)->s_journal; 2388 2389 jbd2_journal_lock_updates(journal); 2390 jbd2_journal_flush(journal); 2391 lock_super(sb); 2392 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && 2393 sb->s_flags & MS_RDONLY) { 2394 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2395 sb->s_dirt = 0; 2396 ext4_commit_super(sb, es, 1); 2397 } 2398 unlock_super(sb); 2399 jbd2_journal_unlock_updates(journal); 2400 } 2401 2402 /* 2403 * If we are mounting (or read-write remounting) a filesystem whose journal 2404 * has recorded an error from a previous lifetime, move that error to the 2405 * main filesystem now. 2406 */ 2407 static void ext4_clear_journal_err(struct super_block * sb, 2408 struct ext4_super_block * es) 2409 { 2410 journal_t *journal; 2411 int j_errno; 2412 const char *errstr; 2413 2414 journal = EXT4_SB(sb)->s_journal; 2415 2416 /* 2417 * Now check for any error status which may have been recorded in the 2418 * journal by a prior ext4_error() or ext4_abort() 2419 */ 2420 2421 j_errno = jbd2_journal_errno(journal); 2422 if (j_errno) { 2423 char nbuf[16]; 2424 2425 errstr = ext4_decode_error(sb, j_errno, nbuf); 2426 ext4_warning(sb, __FUNCTION__, "Filesystem error recorded " 2427 "from previous mount: %s", errstr); 2428 ext4_warning(sb, __FUNCTION__, "Marking fs in need of " 2429 "filesystem check."); 2430 2431 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; 2432 es->s_state |= cpu_to_le16(EXT4_ERROR_FS); 2433 ext4_commit_super (sb, es, 1); 2434 2435 jbd2_journal_clear_err(journal); 2436 } 2437 } 2438 2439 /* 2440 * Force the running and committing transactions to commit, 2441 * and wait on the commit. 2442 */ 2443 int ext4_force_commit(struct super_block *sb) 2444 { 2445 journal_t *journal; 2446 int ret; 2447 2448 if (sb->s_flags & MS_RDONLY) 2449 return 0; 2450 2451 journal = EXT4_SB(sb)->s_journal; 2452 sb->s_dirt = 0; 2453 ret = ext4_journal_force_commit(journal); 2454 return ret; 2455 } 2456 2457 /* 2458 * Ext4 always journals updates to the superblock itself, so we don't 2459 * have to propagate any other updates to the superblock on disk at this 2460 * point. Just start an async writeback to get the buffers on their way 2461 * to the disk. 2462 * 2463 * This implicitly triggers the writebehind on sync(). 2464 */ 2465 2466 static void ext4_write_super (struct super_block * sb) 2467 { 2468 if (mutex_trylock(&sb->s_lock) != 0) 2469 BUG(); 2470 sb->s_dirt = 0; 2471 } 2472 2473 static int ext4_sync_fs(struct super_block *sb, int wait) 2474 { 2475 tid_t target; 2476 2477 sb->s_dirt = 0; 2478 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) { 2479 if (wait) 2480 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target); 2481 } 2482 return 0; 2483 } 2484 2485 /* 2486 * LVM calls this function before a (read-only) snapshot is created. This 2487 * gives us a chance to flush the journal completely and mark the fs clean. 2488 */ 2489 static void ext4_write_super_lockfs(struct super_block *sb) 2490 { 2491 sb->s_dirt = 0; 2492 2493 if (!(sb->s_flags & MS_RDONLY)) { 2494 journal_t *journal = EXT4_SB(sb)->s_journal; 2495 2496 /* Now we set up the journal barrier. */ 2497 jbd2_journal_lock_updates(journal); 2498 jbd2_journal_flush(journal); 2499 2500 /* Journal blocked and flushed, clear needs_recovery flag. */ 2501 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2502 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); 2503 } 2504 } 2505 2506 /* 2507 * Called by LVM after the snapshot is done. We need to reset the RECOVER 2508 * flag here, even though the filesystem is not technically dirty yet. 2509 */ 2510 static void ext4_unlockfs(struct super_block *sb) 2511 { 2512 if (!(sb->s_flags & MS_RDONLY)) { 2513 lock_super(sb); 2514 /* Reser the needs_recovery flag before the fs is unlocked. */ 2515 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); 2516 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); 2517 unlock_super(sb); 2518 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 2519 } 2520 } 2521 2522 static int ext4_remount (struct super_block * sb, int * flags, char * data) 2523 { 2524 struct ext4_super_block * es; 2525 struct ext4_sb_info *sbi = EXT4_SB(sb); 2526 ext4_fsblk_t n_blocks_count = 0; 2527 unsigned long old_sb_flags; 2528 struct ext4_mount_options old_opts; 2529 int err; 2530 #ifdef CONFIG_QUOTA 2531 int i; 2532 #endif 2533 2534 /* Store the original options */ 2535 old_sb_flags = sb->s_flags; 2536 old_opts.s_mount_opt = sbi->s_mount_opt; 2537 old_opts.s_resuid = sbi->s_resuid; 2538 old_opts.s_resgid = sbi->s_resgid; 2539 old_opts.s_commit_interval = sbi->s_commit_interval; 2540 #ifdef CONFIG_QUOTA 2541 old_opts.s_jquota_fmt = sbi->s_jquota_fmt; 2542 for (i = 0; i < MAXQUOTAS; i++) 2543 old_opts.s_qf_names[i] = sbi->s_qf_names[i]; 2544 #endif 2545 2546 /* 2547 * Allow the "check" option to be passed as a remount option. 2548 */ 2549 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) { 2550 err = -EINVAL; 2551 goto restore_opts; 2552 } 2553 2554 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) 2555 ext4_abort(sb, __FUNCTION__, "Abort forced by user"); 2556 2557 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 2558 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 2559 2560 es = sbi->s_es; 2561 2562 ext4_init_journal_params(sb, sbi->s_journal); 2563 2564 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || 2565 n_blocks_count > ext4_blocks_count(es)) { 2566 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) { 2567 err = -EROFS; 2568 goto restore_opts; 2569 } 2570 2571 if (*flags & MS_RDONLY) { 2572 /* 2573 * First of all, the unconditional stuff we have to do 2574 * to disable replay of the journal when we next remount 2575 */ 2576 sb->s_flags |= MS_RDONLY; 2577 2578 /* 2579 * OK, test if we are remounting a valid rw partition 2580 * readonly, and if so set the rdonly flag and then 2581 * mark the partition as valid again. 2582 */ 2583 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && 2584 (sbi->s_mount_state & EXT4_VALID_FS)) 2585 es->s_state = cpu_to_le16(sbi->s_mount_state); 2586 2587 /* 2588 * We have to unlock super so that we can wait for 2589 * transactions. 2590 */ 2591 unlock_super(sb); 2592 ext4_mark_recovery_complete(sb, es); 2593 lock_super(sb); 2594 } else { 2595 __le32 ret; 2596 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb, 2597 ~EXT4_FEATURE_RO_COMPAT_SUPP))) { 2598 printk(KERN_WARNING "EXT4-fs: %s: couldn't " 2599 "remount RDWR because of unsupported " 2600 "optional features (%x).\n", 2601 sb->s_id, le32_to_cpu(ret)); 2602 err = -EROFS; 2603 goto restore_opts; 2604 } 2605 2606 /* 2607 * If we have an unprocessed orphan list hanging 2608 * around from a previously readonly bdev mount, 2609 * require a full umount/remount for now. 2610 */ 2611 if (es->s_last_orphan) { 2612 printk(KERN_WARNING "EXT4-fs: %s: couldn't " 2613 "remount RDWR because of unprocessed " 2614 "orphan inode list. Please " 2615 "umount/remount instead.\n", 2616 sb->s_id); 2617 err = -EINVAL; 2618 goto restore_opts; 2619 } 2620 2621 /* 2622 * Mounting a RDONLY partition read-write, so reread 2623 * and store the current valid flag. (It may have 2624 * been changed by e2fsck since we originally mounted 2625 * the partition.) 2626 */ 2627 ext4_clear_journal_err(sb, es); 2628 sbi->s_mount_state = le16_to_cpu(es->s_state); 2629 if ((err = ext4_group_extend(sb, es, n_blocks_count))) 2630 goto restore_opts; 2631 if (!ext4_setup_super (sb, es, 0)) 2632 sb->s_flags &= ~MS_RDONLY; 2633 } 2634 } 2635 #ifdef CONFIG_QUOTA 2636 /* Release old quota file names */ 2637 for (i = 0; i < MAXQUOTAS; i++) 2638 if (old_opts.s_qf_names[i] && 2639 old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 2640 kfree(old_opts.s_qf_names[i]); 2641 #endif 2642 return 0; 2643 restore_opts: 2644 sb->s_flags = old_sb_flags; 2645 sbi->s_mount_opt = old_opts.s_mount_opt; 2646 sbi->s_resuid = old_opts.s_resuid; 2647 sbi->s_resgid = old_opts.s_resgid; 2648 sbi->s_commit_interval = old_opts.s_commit_interval; 2649 #ifdef CONFIG_QUOTA 2650 sbi->s_jquota_fmt = old_opts.s_jquota_fmt; 2651 for (i = 0; i < MAXQUOTAS; i++) { 2652 if (sbi->s_qf_names[i] && 2653 old_opts.s_qf_names[i] != sbi->s_qf_names[i]) 2654 kfree(sbi->s_qf_names[i]); 2655 sbi->s_qf_names[i] = old_opts.s_qf_names[i]; 2656 } 2657 #endif 2658 return err; 2659 } 2660 2661 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf) 2662 { 2663 struct super_block *sb = dentry->d_sb; 2664 struct ext4_sb_info *sbi = EXT4_SB(sb); 2665 struct ext4_super_block *es = sbi->s_es; 2666 u64 fsid; 2667 2668 if (test_opt(sb, MINIX_DF)) { 2669 sbi->s_overhead_last = 0; 2670 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) { 2671 unsigned long ngroups = sbi->s_groups_count, i; 2672 ext4_fsblk_t overhead = 0; 2673 smp_rmb(); 2674 2675 /* 2676 * Compute the overhead (FS structures). This is constant 2677 * for a given filesystem unless the number of block groups 2678 * changes so we cache the previous value until it does. 2679 */ 2680 2681 /* 2682 * All of the blocks before first_data_block are 2683 * overhead 2684 */ 2685 overhead = le32_to_cpu(es->s_first_data_block); 2686 2687 /* 2688 * Add the overhead attributed to the superblock and 2689 * block group descriptors. If the sparse superblocks 2690 * feature is turned on, then not all groups have this. 2691 */ 2692 for (i = 0; i < ngroups; i++) { 2693 overhead += ext4_bg_has_super(sb, i) + 2694 ext4_bg_num_gdb(sb, i); 2695 cond_resched(); 2696 } 2697 2698 /* 2699 * Every block group has an inode bitmap, a block 2700 * bitmap, and an inode table. 2701 */ 2702 overhead += ngroups * (2 + sbi->s_itb_per_group); 2703 sbi->s_overhead_last = overhead; 2704 smp_wmb(); 2705 sbi->s_blocks_last = ext4_blocks_count(es); 2706 } 2707 2708 buf->f_type = EXT4_SUPER_MAGIC; 2709 buf->f_bsize = sb->s_blocksize; 2710 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last; 2711 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter); 2712 ext4_free_blocks_count_set(es, buf->f_bfree); 2713 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); 2714 if (buf->f_bfree < ext4_r_blocks_count(es)) 2715 buf->f_bavail = 0; 2716 buf->f_files = le32_to_cpu(es->s_inodes_count); 2717 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); 2718 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); 2719 buf->f_namelen = EXT4_NAME_LEN; 2720 fsid = le64_to_cpup((void *)es->s_uuid) ^ 2721 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 2722 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 2723 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 2724 return 0; 2725 } 2726 2727 /* Helper function for writing quotas on sync - we need to start transaction before quota file 2728 * is locked for write. Otherwise the are possible deadlocks: 2729 * Process 1 Process 2 2730 * ext4_create() quota_sync() 2731 * jbd2_journal_start() write_dquot() 2732 * DQUOT_INIT() down(dqio_mutex) 2733 * down(dqio_mutex) jbd2_journal_start() 2734 * 2735 */ 2736 2737 #ifdef CONFIG_QUOTA 2738 2739 static inline struct inode *dquot_to_inode(struct dquot *dquot) 2740 { 2741 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; 2742 } 2743 2744 static int ext4_dquot_initialize(struct inode *inode, int type) 2745 { 2746 handle_t *handle; 2747 int ret, err; 2748 2749 /* We may create quota structure so we need to reserve enough blocks */ 2750 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb)); 2751 if (IS_ERR(handle)) 2752 return PTR_ERR(handle); 2753 ret = dquot_initialize(inode, type); 2754 err = ext4_journal_stop(handle); 2755 if (!ret) 2756 ret = err; 2757 return ret; 2758 } 2759 2760 static int ext4_dquot_drop(struct inode *inode) 2761 { 2762 handle_t *handle; 2763 int ret, err; 2764 2765 /* We may delete quota structure so we need to reserve enough blocks */ 2766 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb)); 2767 if (IS_ERR(handle)) 2768 return PTR_ERR(handle); 2769 ret = dquot_drop(inode); 2770 err = ext4_journal_stop(handle); 2771 if (!ret) 2772 ret = err; 2773 return ret; 2774 } 2775 2776 static int ext4_write_dquot(struct dquot *dquot) 2777 { 2778 int ret, err; 2779 handle_t *handle; 2780 struct inode *inode; 2781 2782 inode = dquot_to_inode(dquot); 2783 handle = ext4_journal_start(inode, 2784 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 2785 if (IS_ERR(handle)) 2786 return PTR_ERR(handle); 2787 ret = dquot_commit(dquot); 2788 err = ext4_journal_stop(handle); 2789 if (!ret) 2790 ret = err; 2791 return ret; 2792 } 2793 2794 static int ext4_acquire_dquot(struct dquot *dquot) 2795 { 2796 int ret, err; 2797 handle_t *handle; 2798 2799 handle = ext4_journal_start(dquot_to_inode(dquot), 2800 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 2801 if (IS_ERR(handle)) 2802 return PTR_ERR(handle); 2803 ret = dquot_acquire(dquot); 2804 err = ext4_journal_stop(handle); 2805 if (!ret) 2806 ret = err; 2807 return ret; 2808 } 2809 2810 static int ext4_release_dquot(struct dquot *dquot) 2811 { 2812 int ret, err; 2813 handle_t *handle; 2814 2815 handle = ext4_journal_start(dquot_to_inode(dquot), 2816 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 2817 if (IS_ERR(handle)) { 2818 /* Release dquot anyway to avoid endless cycle in dqput() */ 2819 dquot_release(dquot); 2820 return PTR_ERR(handle); 2821 } 2822 ret = dquot_release(dquot); 2823 err = ext4_journal_stop(handle); 2824 if (!ret) 2825 ret = err; 2826 return ret; 2827 } 2828 2829 static int ext4_mark_dquot_dirty(struct dquot *dquot) 2830 { 2831 /* Are we journalling quotas? */ 2832 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || 2833 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { 2834 dquot_mark_dquot_dirty(dquot); 2835 return ext4_write_dquot(dquot); 2836 } else { 2837 return dquot_mark_dquot_dirty(dquot); 2838 } 2839 } 2840 2841 static int ext4_write_info(struct super_block *sb, int type) 2842 { 2843 int ret, err; 2844 handle_t *handle; 2845 2846 /* Data block + inode block */ 2847 handle = ext4_journal_start(sb->s_root->d_inode, 2); 2848 if (IS_ERR(handle)) 2849 return PTR_ERR(handle); 2850 ret = dquot_commit_info(sb, type); 2851 err = ext4_journal_stop(handle); 2852 if (!ret) 2853 ret = err; 2854 return ret; 2855 } 2856 2857 /* 2858 * Turn on quotas during mount time - we need to find 2859 * the quota file and such... 2860 */ 2861 static int ext4_quota_on_mount(struct super_block *sb, int type) 2862 { 2863 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], 2864 EXT4_SB(sb)->s_jquota_fmt, type); 2865 } 2866 2867 /* 2868 * Standard function to be called on quota_on 2869 */ 2870 static int ext4_quota_on(struct super_block *sb, int type, int format_id, 2871 char *path) 2872 { 2873 int err; 2874 struct nameidata nd; 2875 2876 if (!test_opt(sb, QUOTA)) 2877 return -EINVAL; 2878 /* Not journalling quota? */ 2879 if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] && 2880 !EXT4_SB(sb)->s_qf_names[GRPQUOTA]) 2881 return vfs_quota_on(sb, type, format_id, path); 2882 err = path_lookup(path, LOOKUP_FOLLOW, &nd); 2883 if (err) 2884 return err; 2885 /* Quotafile not on the same filesystem? */ 2886 if (nd.mnt->mnt_sb != sb) { 2887 path_release(&nd); 2888 return -EXDEV; 2889 } 2890 /* Quotafile not of fs root? */ 2891 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode) 2892 printk(KERN_WARNING 2893 "EXT4-fs: Quota file not on filesystem root. " 2894 "Journalled quota will not work.\n"); 2895 path_release(&nd); 2896 return vfs_quota_on(sb, type, format_id, path); 2897 } 2898 2899 /* Read data from quotafile - avoid pagecache and such because we cannot afford 2900 * acquiring the locks... As quota files are never truncated and quota code 2901 * itself serializes the operations (and noone else should touch the files) 2902 * we don't have to be afraid of races */ 2903 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, 2904 size_t len, loff_t off) 2905 { 2906 struct inode *inode = sb_dqopt(sb)->files[type]; 2907 sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 2908 int err = 0; 2909 int offset = off & (sb->s_blocksize - 1); 2910 int tocopy; 2911 size_t toread; 2912 struct buffer_head *bh; 2913 loff_t i_size = i_size_read(inode); 2914 2915 if (off > i_size) 2916 return 0; 2917 if (off+len > i_size) 2918 len = i_size-off; 2919 toread = len; 2920 while (toread > 0) { 2921 tocopy = sb->s_blocksize - offset < toread ? 2922 sb->s_blocksize - offset : toread; 2923 bh = ext4_bread(NULL, inode, blk, 0, &err); 2924 if (err) 2925 return err; 2926 if (!bh) /* A hole? */ 2927 memset(data, 0, tocopy); 2928 else 2929 memcpy(data, bh->b_data+offset, tocopy); 2930 brelse(bh); 2931 offset = 0; 2932 toread -= tocopy; 2933 data += tocopy; 2934 blk++; 2935 } 2936 return len; 2937 } 2938 2939 /* Write to quotafile (we know the transaction is already started and has 2940 * enough credits) */ 2941 static ssize_t ext4_quota_write(struct super_block *sb, int type, 2942 const char *data, size_t len, loff_t off) 2943 { 2944 struct inode *inode = sb_dqopt(sb)->files[type]; 2945 sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); 2946 int err = 0; 2947 int offset = off & (sb->s_blocksize - 1); 2948 int tocopy; 2949 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL; 2950 size_t towrite = len; 2951 struct buffer_head *bh; 2952 handle_t *handle = journal_current_handle(); 2953 2954 if (!handle) { 2955 printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)" 2956 " cancelled because transaction is not started.\n", 2957 (unsigned long long)off, (unsigned long long)len); 2958 return -EIO; 2959 } 2960 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 2961 while (towrite > 0) { 2962 tocopy = sb->s_blocksize - offset < towrite ? 2963 sb->s_blocksize - offset : towrite; 2964 bh = ext4_bread(handle, inode, blk, 1, &err); 2965 if (!bh) 2966 goto out; 2967 if (journal_quota) { 2968 err = ext4_journal_get_write_access(handle, bh); 2969 if (err) { 2970 brelse(bh); 2971 goto out; 2972 } 2973 } 2974 lock_buffer(bh); 2975 memcpy(bh->b_data+offset, data, tocopy); 2976 flush_dcache_page(bh->b_page); 2977 unlock_buffer(bh); 2978 if (journal_quota) 2979 err = ext4_journal_dirty_metadata(handle, bh); 2980 else { 2981 /* Always do at least ordered writes for quotas */ 2982 err = ext4_journal_dirty_data(handle, bh); 2983 mark_buffer_dirty(bh); 2984 } 2985 brelse(bh); 2986 if (err) 2987 goto out; 2988 offset = 0; 2989 towrite -= tocopy; 2990 data += tocopy; 2991 blk++; 2992 } 2993 out: 2994 if (len == towrite) 2995 return err; 2996 if (inode->i_size < off+len-towrite) { 2997 i_size_write(inode, off+len-towrite); 2998 EXT4_I(inode)->i_disksize = inode->i_size; 2999 } 3000 inode->i_version++; 3001 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 3002 ext4_mark_inode_dirty(handle, inode); 3003 mutex_unlock(&inode->i_mutex); 3004 return len - towrite; 3005 } 3006 3007 #endif 3008 3009 static int ext4_get_sb(struct file_system_type *fs_type, 3010 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 3011 { 3012 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt); 3013 } 3014 3015 static struct file_system_type ext4dev_fs_type = { 3016 .owner = THIS_MODULE, 3017 .name = "ext4dev", 3018 .get_sb = ext4_get_sb, 3019 .kill_sb = kill_block_super, 3020 .fs_flags = FS_REQUIRES_DEV, 3021 }; 3022 3023 static int __init init_ext4_fs(void) 3024 { 3025 int err = init_ext4_xattr(); 3026 if (err) 3027 return err; 3028 err = init_inodecache(); 3029 if (err) 3030 goto out1; 3031 err = register_filesystem(&ext4dev_fs_type); 3032 if (err) 3033 goto out; 3034 return 0; 3035 out: 3036 destroy_inodecache(); 3037 out1: 3038 exit_ext4_xattr(); 3039 return err; 3040 } 3041 3042 static void __exit exit_ext4_fs(void) 3043 { 3044 unregister_filesystem(&ext4dev_fs_type); 3045 destroy_inodecache(); 3046 exit_ext4_xattr(); 3047 } 3048 3049 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); 3050 MODULE_DESCRIPTION("Fourth Extended Filesystem with extents"); 3051 MODULE_LICENSE("GPL"); 3052 module_init(init_ext4_fs) 3053 module_exit(exit_ext4_fs) 3054