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