1/* 2 * linux/fs/ext3/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/blkdev.h> 21#include <linux/parser.h> 22#include <linux/exportfs.h> 23#include <linux/statfs.h> 24#include <linux/random.h> 25#include <linux/mount.h> 26#include <linux/quotaops.h> 27#include <linux/seq_file.h> 28#include <linux/log2.h> 29#include <linux/cleancache.h> 30#include <linux/namei.h> 31 32#include <asm/uaccess.h> 33 34#define CREATE_TRACE_POINTS 35 36#include "ext3.h" 37#include "xattr.h" 38#include "acl.h" 39#include "namei.h" 40 41#ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED 42 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA 43#else 44 #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA 45#endif 46 47static int ext3_load_journal(struct super_block *, struct ext3_super_block *, 48 unsigned long journal_devnum); 49static int ext3_create_journal(struct super_block *, struct ext3_super_block *, 50 unsigned int); 51static int ext3_commit_super(struct super_block *sb, 52 struct ext3_super_block *es, 53 int sync); 54static void ext3_mark_recovery_complete(struct super_block * sb, 55 struct ext3_super_block * es); 56static void ext3_clear_journal_err(struct super_block * sb, 57 struct ext3_super_block * es); 58static int ext3_sync_fs(struct super_block *sb, int wait); 59static const char *ext3_decode_error(struct super_block * sb, int errno, 60 char nbuf[16]); 61static int ext3_remount (struct super_block * sb, int * flags, char * data); 62static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf); 63static int ext3_unfreeze(struct super_block *sb); 64static int ext3_freeze(struct super_block *sb); 65 66/* 67 * Wrappers for journal_start/end. 68 */ 69handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks) 70{ 71 journal_t *journal; 72 73 if (sb->s_flags & MS_RDONLY) 74 return ERR_PTR(-EROFS); 75 76 /* Special case here: if the journal has aborted behind our 77 * backs (eg. EIO in the commit thread), then we still need to 78 * take the FS itself readonly cleanly. */ 79 journal = EXT3_SB(sb)->s_journal; 80 if (is_journal_aborted(journal)) { 81 ext3_abort(sb, __func__, 82 "Detected aborted journal"); 83 return ERR_PTR(-EROFS); 84 } 85 86 return journal_start(journal, nblocks); 87} 88 89int __ext3_journal_stop(const char *where, handle_t *handle) 90{ 91 struct super_block *sb; 92 int err; 93 int rc; 94 95 sb = handle->h_transaction->t_journal->j_private; 96 err = handle->h_err; 97 rc = journal_stop(handle); 98 99 if (!err) 100 err = rc; 101 if (err) 102 __ext3_std_error(sb, where, err); 103 return err; 104} 105 106void ext3_journal_abort_handle(const char *caller, const char *err_fn, 107 struct buffer_head *bh, handle_t *handle, int err) 108{ 109 char nbuf[16]; 110 const char *errstr = ext3_decode_error(NULL, err, nbuf); 111 112 if (bh) 113 BUFFER_TRACE(bh, "abort"); 114 115 if (!handle->h_err) 116 handle->h_err = err; 117 118 if (is_handle_aborted(handle)) 119 return; 120 121 printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n", 122 caller, errstr, err_fn); 123 124 journal_abort_handle(handle); 125} 126 127void ext3_msg(struct super_block *sb, const char *prefix, 128 const char *fmt, ...) 129{ 130 struct va_format vaf; 131 va_list args; 132 133 va_start(args, fmt); 134 135 vaf.fmt = fmt; 136 vaf.va = &args; 137 138 printk("%sEXT3-fs (%s): %pV\n", prefix, sb->s_id, &vaf); 139 140 va_end(args); 141} 142 143/* Deal with the reporting of failure conditions on a filesystem such as 144 * inconsistencies detected or read IO failures. 145 * 146 * On ext2, we can store the error state of the filesystem in the 147 * superblock. That is not possible on ext3, because we may have other 148 * write ordering constraints on the superblock which prevent us from 149 * writing it out straight away; and given that the journal is about to 150 * be aborted, we can't rely on the current, or future, transactions to 151 * write out the superblock safely. 152 * 153 * We'll just use the journal_abort() error code to record an error in 154 * the journal instead. On recovery, the journal will complain about 155 * that error until we've noted it down and cleared it. 156 */ 157 158static void ext3_handle_error(struct super_block *sb) 159{ 160 struct ext3_super_block *es = EXT3_SB(sb)->s_es; 161 162 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS; 163 es->s_state |= cpu_to_le16(EXT3_ERROR_FS); 164 165 if (sb->s_flags & MS_RDONLY) 166 return; 167 168 if (!test_opt (sb, ERRORS_CONT)) { 169 journal_t *journal = EXT3_SB(sb)->s_journal; 170 171 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT); 172 if (journal) 173 journal_abort(journal, -EIO); 174 } 175 if (test_opt (sb, ERRORS_RO)) { 176 ext3_msg(sb, KERN_CRIT, 177 "error: remounting filesystem read-only"); 178 /* 179 * Make sure updated value of ->s_mount_state will be visible 180 * before ->s_flags update. 181 */ 182 smp_wmb(); 183 sb->s_flags |= MS_RDONLY; 184 } 185 ext3_commit_super(sb, es, 1); 186 if (test_opt(sb, ERRORS_PANIC)) 187 panic("EXT3-fs (%s): panic forced after error\n", 188 sb->s_id); 189} 190 191void ext3_error(struct super_block *sb, const char *function, 192 const char *fmt, ...) 193{ 194 struct va_format vaf; 195 va_list args; 196 197 va_start(args, fmt); 198 199 vaf.fmt = fmt; 200 vaf.va = &args; 201 202 printk(KERN_CRIT "EXT3-fs error (device %s): %s: %pV\n", 203 sb->s_id, function, &vaf); 204 205 va_end(args); 206 207 ext3_handle_error(sb); 208} 209 210static const char *ext3_decode_error(struct super_block * sb, int errno, 211 char nbuf[16]) 212{ 213 char *errstr = NULL; 214 215 switch (errno) { 216 case -EIO: 217 errstr = "IO failure"; 218 break; 219 case -ENOMEM: 220 errstr = "Out of memory"; 221 break; 222 case -EROFS: 223 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT) 224 errstr = "Journal has aborted"; 225 else 226 errstr = "Readonly filesystem"; 227 break; 228 default: 229 /* If the caller passed in an extra buffer for unknown 230 * errors, textualise them now. Else we just return 231 * NULL. */ 232 if (nbuf) { 233 /* Check for truncated error codes... */ 234 if (snprintf(nbuf, 16, "error %d", -errno) >= 0) 235 errstr = nbuf; 236 } 237 break; 238 } 239 240 return errstr; 241} 242 243/* __ext3_std_error decodes expected errors from journaling functions 244 * automatically and invokes the appropriate error response. */ 245 246void __ext3_std_error (struct super_block * sb, const char * function, 247 int errno) 248{ 249 char nbuf[16]; 250 const char *errstr; 251 252 /* Special case: if the error is EROFS, and we're not already 253 * inside a transaction, then there's really no point in logging 254 * an error. */ 255 if (errno == -EROFS && journal_current_handle() == NULL && 256 (sb->s_flags & MS_RDONLY)) 257 return; 258 259 errstr = ext3_decode_error(sb, errno, nbuf); 260 ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr); 261 262 ext3_handle_error(sb); 263} 264 265/* 266 * ext3_abort is a much stronger failure handler than ext3_error. The 267 * abort function may be used to deal with unrecoverable failures such 268 * as journal IO errors or ENOMEM at a critical moment in log management. 269 * 270 * We unconditionally force the filesystem into an ABORT|READONLY state, 271 * unless the error response on the fs has been set to panic in which 272 * case we take the easy way out and panic immediately. 273 */ 274 275void ext3_abort(struct super_block *sb, const char *function, 276 const char *fmt, ...) 277{ 278 struct va_format vaf; 279 va_list args; 280 281 va_start(args, fmt); 282 283 vaf.fmt = fmt; 284 vaf.va = &args; 285 286 printk(KERN_CRIT "EXT3-fs (%s): error: %s: %pV\n", 287 sb->s_id, function, &vaf); 288 289 va_end(args); 290 291 if (test_opt(sb, ERRORS_PANIC)) 292 panic("EXT3-fs: panic from previous error\n"); 293 294 if (sb->s_flags & MS_RDONLY) 295 return; 296 297 ext3_msg(sb, KERN_CRIT, 298 "error: remounting filesystem read-only"); 299 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS; 300 set_opt(EXT3_SB(sb)->s_mount_opt, ABORT); 301 /* 302 * Make sure updated value of ->s_mount_state will be visible 303 * before ->s_flags update. 304 */ 305 smp_wmb(); 306 sb->s_flags |= MS_RDONLY; 307 308 if (EXT3_SB(sb)->s_journal) 309 journal_abort(EXT3_SB(sb)->s_journal, -EIO); 310} 311 312void ext3_warning(struct super_block *sb, const char *function, 313 const char *fmt, ...) 314{ 315 struct va_format vaf; 316 va_list args; 317 318 va_start(args, fmt); 319 320 vaf.fmt = fmt; 321 vaf.va = &args; 322 323 printk(KERN_WARNING "EXT3-fs (%s): warning: %s: %pV\n", 324 sb->s_id, function, &vaf); 325 326 va_end(args); 327} 328 329void ext3_update_dynamic_rev(struct super_block *sb) 330{ 331 struct ext3_super_block *es = EXT3_SB(sb)->s_es; 332 333 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV) 334 return; 335 336 ext3_msg(sb, KERN_WARNING, 337 "warning: updating to rev %d because of " 338 "new feature flag, running e2fsck is recommended", 339 EXT3_DYNAMIC_REV); 340 341 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO); 342 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE); 343 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV); 344 /* leave es->s_feature_*compat flags alone */ 345 /* es->s_uuid will be set by e2fsck if empty */ 346 347 /* 348 * The rest of the superblock fields should be zero, and if not it 349 * means they are likely already in use, so leave them alone. We 350 * can leave it up to e2fsck to clean up any inconsistencies there. 351 */ 352} 353 354/* 355 * Open the external journal device 356 */ 357static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb) 358{ 359 struct block_device *bdev; 360 char b[BDEVNAME_SIZE]; 361 362 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb); 363 if (IS_ERR(bdev)) 364 goto fail; 365 return bdev; 366 367fail: 368 ext3_msg(sb, KERN_ERR, "error: failed to open journal device %s: %ld", 369 __bdevname(dev, b), PTR_ERR(bdev)); 370 371 return NULL; 372} 373 374/* 375 * Release the journal device 376 */ 377static void ext3_blkdev_put(struct block_device *bdev) 378{ 379 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); 380} 381 382static void ext3_blkdev_remove(struct ext3_sb_info *sbi) 383{ 384 struct block_device *bdev; 385 bdev = sbi->journal_bdev; 386 if (bdev) { 387 ext3_blkdev_put(bdev); 388 sbi->journal_bdev = NULL; 389 } 390} 391 392static inline struct inode *orphan_list_entry(struct list_head *l) 393{ 394 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode; 395} 396 397static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi) 398{ 399 struct list_head *l; 400 401 ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d", 402 le32_to_cpu(sbi->s_es->s_last_orphan)); 403 404 ext3_msg(sb, KERN_ERR, "sb_info orphan list:"); 405 list_for_each(l, &sbi->s_orphan) { 406 struct inode *inode = orphan_list_entry(l); 407 ext3_msg(sb, KERN_ERR, " " 408 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", 409 inode->i_sb->s_id, inode->i_ino, inode, 410 inode->i_mode, inode->i_nlink, 411 NEXT_ORPHAN(inode)); 412 } 413} 414 415static void ext3_put_super (struct super_block * sb) 416{ 417 struct ext3_sb_info *sbi = EXT3_SB(sb); 418 struct ext3_super_block *es = sbi->s_es; 419 int i, err; 420 421 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); 422 ext3_xattr_put_super(sb); 423 err = journal_destroy(sbi->s_journal); 424 sbi->s_journal = NULL; 425 if (err < 0) 426 ext3_abort(sb, __func__, "Couldn't clean up the journal"); 427 428 if (!(sb->s_flags & MS_RDONLY)) { 429 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); 430 es->s_state = cpu_to_le16(sbi->s_mount_state); 431 BUFFER_TRACE(sbi->s_sbh, "marking dirty"); 432 mark_buffer_dirty(sbi->s_sbh); 433 ext3_commit_super(sb, es, 1); 434 } 435 436 for (i = 0; i < sbi->s_gdb_count; i++) 437 brelse(sbi->s_group_desc[i]); 438 kfree(sbi->s_group_desc); 439 percpu_counter_destroy(&sbi->s_freeblocks_counter); 440 percpu_counter_destroy(&sbi->s_freeinodes_counter); 441 percpu_counter_destroy(&sbi->s_dirs_counter); 442 brelse(sbi->s_sbh); 443#ifdef CONFIG_QUOTA 444 for (i = 0; i < EXT3_MAXQUOTAS; i++) 445 kfree(sbi->s_qf_names[i]); 446#endif 447 448 /* Debugging code just in case the in-memory inode orphan list 449 * isn't empty. The on-disk one can be non-empty if we've 450 * detected an error and taken the fs readonly, but the 451 * in-memory list had better be clean by this point. */ 452 if (!list_empty(&sbi->s_orphan)) 453 dump_orphan_list(sb, sbi); 454 J_ASSERT(list_empty(&sbi->s_orphan)); 455 456 invalidate_bdev(sb->s_bdev); 457 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { 458 /* 459 * Invalidate the journal device's buffers. We don't want them 460 * floating about in memory - the physical journal device may 461 * hotswapped, and it breaks the `ro-after' testing code. 462 */ 463 sync_blockdev(sbi->journal_bdev); 464 invalidate_bdev(sbi->journal_bdev); 465 ext3_blkdev_remove(sbi); 466 } 467 sb->s_fs_info = NULL; 468 kfree(sbi->s_blockgroup_lock); 469 mutex_destroy(&sbi->s_orphan_lock); 470 mutex_destroy(&sbi->s_resize_lock); 471 kfree(sbi); 472} 473 474static struct kmem_cache *ext3_inode_cachep; 475 476/* 477 * Called inside transaction, so use GFP_NOFS 478 */ 479static struct inode *ext3_alloc_inode(struct super_block *sb) 480{ 481 struct ext3_inode_info *ei; 482 483 ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS); 484 if (!ei) 485 return NULL; 486 ei->i_block_alloc_info = NULL; 487 ei->vfs_inode.i_version = 1; 488 atomic_set(&ei->i_datasync_tid, 0); 489 atomic_set(&ei->i_sync_tid, 0); 490#ifdef CONFIG_QUOTA 491 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot)); 492#endif 493 494 return &ei->vfs_inode; 495} 496 497static int ext3_drop_inode(struct inode *inode) 498{ 499 int drop = generic_drop_inode(inode); 500 501 trace_ext3_drop_inode(inode, drop); 502 return drop; 503} 504 505static void ext3_i_callback(struct rcu_head *head) 506{ 507 struct inode *inode = container_of(head, struct inode, i_rcu); 508 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode)); 509} 510 511static void ext3_destroy_inode(struct inode *inode) 512{ 513 if (!list_empty(&(EXT3_I(inode)->i_orphan))) { 514 printk("EXT3 Inode %p: orphan list check failed!\n", 515 EXT3_I(inode)); 516 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, 517 EXT3_I(inode), sizeof(struct ext3_inode_info), 518 false); 519 dump_stack(); 520 } 521 call_rcu(&inode->i_rcu, ext3_i_callback); 522} 523 524static void init_once(void *foo) 525{ 526 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo; 527 528 INIT_LIST_HEAD(&ei->i_orphan); 529#ifdef CONFIG_EXT3_FS_XATTR 530 init_rwsem(&ei->xattr_sem); 531#endif 532 mutex_init(&ei->truncate_mutex); 533 inode_init_once(&ei->vfs_inode); 534} 535 536static int __init init_inodecache(void) 537{ 538 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache", 539 sizeof(struct ext3_inode_info), 540 0, (SLAB_RECLAIM_ACCOUNT| 541 SLAB_MEM_SPREAD), 542 init_once); 543 if (ext3_inode_cachep == NULL) 544 return -ENOMEM; 545 return 0; 546} 547 548static void destroy_inodecache(void) 549{ 550 /* 551 * Make sure all delayed rcu free inodes are flushed before we 552 * destroy cache. 553 */ 554 rcu_barrier(); 555 kmem_cache_destroy(ext3_inode_cachep); 556} 557 558static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb) 559{ 560#if defined(CONFIG_QUOTA) 561 struct ext3_sb_info *sbi = EXT3_SB(sb); 562 563 if (sbi->s_jquota_fmt) { 564 char *fmtname = ""; 565 566 switch (sbi->s_jquota_fmt) { 567 case QFMT_VFS_OLD: 568 fmtname = "vfsold"; 569 break; 570 case QFMT_VFS_V0: 571 fmtname = "vfsv0"; 572 break; 573 case QFMT_VFS_V1: 574 fmtname = "vfsv1"; 575 break; 576 } 577 seq_printf(seq, ",jqfmt=%s", fmtname); 578 } 579 580 if (sbi->s_qf_names[USRQUOTA]) 581 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); 582 583 if (sbi->s_qf_names[GRPQUOTA]) 584 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); 585 586 if (test_opt(sb, USRQUOTA)) 587 seq_puts(seq, ",usrquota"); 588 589 if (test_opt(sb, GRPQUOTA)) 590 seq_puts(seq, ",grpquota"); 591#endif 592} 593 594static char *data_mode_string(unsigned long mode) 595{ 596 switch (mode) { 597 case EXT3_MOUNT_JOURNAL_DATA: 598 return "journal"; 599 case EXT3_MOUNT_ORDERED_DATA: 600 return "ordered"; 601 case EXT3_MOUNT_WRITEBACK_DATA: 602 return "writeback"; 603 } 604 return "unknown"; 605} 606 607/* 608 * Show an option if 609 * - it's set to a non-default value OR 610 * - if the per-sb default is different from the global default 611 */ 612static int ext3_show_options(struct seq_file *seq, struct dentry *root) 613{ 614 struct super_block *sb = root->d_sb; 615 struct ext3_sb_info *sbi = EXT3_SB(sb); 616 struct ext3_super_block *es = sbi->s_es; 617 unsigned long def_mount_opts; 618 619 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 620 621 if (sbi->s_sb_block != 1) 622 seq_printf(seq, ",sb=%lu", sbi->s_sb_block); 623 if (test_opt(sb, MINIX_DF)) 624 seq_puts(seq, ",minixdf"); 625 if (test_opt(sb, GRPID)) 626 seq_puts(seq, ",grpid"); 627 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS)) 628 seq_puts(seq, ",nogrpid"); 629 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT3_DEF_RESUID)) || 630 le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) { 631 seq_printf(seq, ",resuid=%u", 632 from_kuid_munged(&init_user_ns, sbi->s_resuid)); 633 } 634 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT3_DEF_RESGID)) || 635 le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) { 636 seq_printf(seq, ",resgid=%u", 637 from_kgid_munged(&init_user_ns, sbi->s_resgid)); 638 } 639 if (test_opt(sb, ERRORS_RO)) { 640 int def_errors = le16_to_cpu(es->s_errors); 641 642 if (def_errors == EXT3_ERRORS_PANIC || 643 def_errors == EXT3_ERRORS_CONTINUE) { 644 seq_puts(seq, ",errors=remount-ro"); 645 } 646 } 647 if (test_opt(sb, ERRORS_CONT)) 648 seq_puts(seq, ",errors=continue"); 649 if (test_opt(sb, ERRORS_PANIC)) 650 seq_puts(seq, ",errors=panic"); 651 if (test_opt(sb, NO_UID32)) 652 seq_puts(seq, ",nouid32"); 653 if (test_opt(sb, DEBUG)) 654 seq_puts(seq, ",debug"); 655#ifdef CONFIG_EXT3_FS_XATTR 656 if (test_opt(sb, XATTR_USER)) 657 seq_puts(seq, ",user_xattr"); 658 if (!test_opt(sb, XATTR_USER) && 659 (def_mount_opts & EXT3_DEFM_XATTR_USER)) { 660 seq_puts(seq, ",nouser_xattr"); 661 } 662#endif 663#ifdef CONFIG_EXT3_FS_POSIX_ACL 664 if (test_opt(sb, POSIX_ACL)) 665 seq_puts(seq, ",acl"); 666 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL)) 667 seq_puts(seq, ",noacl"); 668#endif 669 if (!test_opt(sb, RESERVATION)) 670 seq_puts(seq, ",noreservation"); 671 if (sbi->s_commit_interval) { 672 seq_printf(seq, ",commit=%u", 673 (unsigned) (sbi->s_commit_interval / HZ)); 674 } 675 676 /* 677 * Always display barrier state so it's clear what the status is. 678 */ 679 seq_puts(seq, ",barrier="); 680 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0"); 681 seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS))); 682 if (test_opt(sb, DATA_ERR_ABORT)) 683 seq_puts(seq, ",data_err=abort"); 684 685 if (test_opt(sb, NOLOAD)) 686 seq_puts(seq, ",norecovery"); 687 688 ext3_show_quota_options(seq, sb); 689 690 return 0; 691} 692 693 694static struct inode *ext3_nfs_get_inode(struct super_block *sb, 695 u64 ino, u32 generation) 696{ 697 struct inode *inode; 698 699 if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO) 700 return ERR_PTR(-ESTALE); 701 if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count)) 702 return ERR_PTR(-ESTALE); 703 704 /* iget isn't really right if the inode is currently unallocated!! 705 * 706 * ext3_read_inode will return a bad_inode if the inode had been 707 * deleted, so we should be safe. 708 * 709 * Currently we don't know the generation for parent directory, so 710 * a generation of 0 means "accept any" 711 */ 712 inode = ext3_iget(sb, ino); 713 if (IS_ERR(inode)) 714 return ERR_CAST(inode); 715 if (generation && inode->i_generation != generation) { 716 iput(inode); 717 return ERR_PTR(-ESTALE); 718 } 719 720 return inode; 721} 722 723static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid, 724 int fh_len, int fh_type) 725{ 726 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 727 ext3_nfs_get_inode); 728} 729 730static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid, 731 int fh_len, int fh_type) 732{ 733 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 734 ext3_nfs_get_inode); 735} 736 737/* 738 * Try to release metadata pages (indirect blocks, directories) which are 739 * mapped via the block device. Since these pages could have journal heads 740 * which would prevent try_to_free_buffers() from freeing them, we must use 741 * jbd layer's try_to_free_buffers() function to release them. 742 */ 743static int bdev_try_to_free_page(struct super_block *sb, struct page *page, 744 gfp_t wait) 745{ 746 journal_t *journal = EXT3_SB(sb)->s_journal; 747 748 WARN_ON(PageChecked(page)); 749 if (!page_has_buffers(page)) 750 return 0; 751 if (journal) 752 return journal_try_to_free_buffers(journal, page, 753 wait & ~__GFP_WAIT); 754 return try_to_free_buffers(page); 755} 756 757#ifdef CONFIG_QUOTA 758#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group") 759#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) 760 761static int ext3_write_dquot(struct dquot *dquot); 762static int ext3_acquire_dquot(struct dquot *dquot); 763static int ext3_release_dquot(struct dquot *dquot); 764static int ext3_mark_dquot_dirty(struct dquot *dquot); 765static int ext3_write_info(struct super_block *sb, int type); 766static int ext3_quota_on(struct super_block *sb, int type, int format_id, 767 struct path *path); 768static int ext3_quota_on_mount(struct super_block *sb, int type); 769static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data, 770 size_t len, loff_t off); 771static ssize_t ext3_quota_write(struct super_block *sb, int type, 772 const char *data, size_t len, loff_t off); 773static struct dquot **ext3_get_dquots(struct inode *inode) 774{ 775 return EXT3_I(inode)->i_dquot; 776} 777 778static const struct dquot_operations ext3_quota_operations = { 779 .write_dquot = ext3_write_dquot, 780 .acquire_dquot = ext3_acquire_dquot, 781 .release_dquot = ext3_release_dquot, 782 .mark_dirty = ext3_mark_dquot_dirty, 783 .write_info = ext3_write_info, 784 .alloc_dquot = dquot_alloc, 785 .destroy_dquot = dquot_destroy, 786}; 787 788static const struct quotactl_ops ext3_qctl_operations = { 789 .quota_on = ext3_quota_on, 790 .quota_off = dquot_quota_off, 791 .quota_sync = dquot_quota_sync, 792 .get_state = dquot_get_state, 793 .set_info = dquot_set_dqinfo, 794 .get_dqblk = dquot_get_dqblk, 795 .set_dqblk = dquot_set_dqblk 796}; 797#endif 798 799static const struct super_operations ext3_sops = { 800 .alloc_inode = ext3_alloc_inode, 801 .destroy_inode = ext3_destroy_inode, 802 .write_inode = ext3_write_inode, 803 .dirty_inode = ext3_dirty_inode, 804 .drop_inode = ext3_drop_inode, 805 .evict_inode = ext3_evict_inode, 806 .put_super = ext3_put_super, 807 .sync_fs = ext3_sync_fs, 808 .freeze_fs = ext3_freeze, 809 .unfreeze_fs = ext3_unfreeze, 810 .statfs = ext3_statfs, 811 .remount_fs = ext3_remount, 812 .show_options = ext3_show_options, 813#ifdef CONFIG_QUOTA 814 .quota_read = ext3_quota_read, 815 .quota_write = ext3_quota_write, 816 .get_dquots = ext3_get_dquots, 817#endif 818 .bdev_try_to_free_page = bdev_try_to_free_page, 819}; 820 821static const struct export_operations ext3_export_ops = { 822 .fh_to_dentry = ext3_fh_to_dentry, 823 .fh_to_parent = ext3_fh_to_parent, 824 .get_parent = ext3_get_parent, 825}; 826 827enum { 828 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 829 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, 830 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov, 831 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, 832 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh, 833 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev, 834 Opt_journal_path, 835 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, 836 Opt_data_err_abort, Opt_data_err_ignore, 837 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, 838 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota, 839 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err, 840 Opt_resize, Opt_usrquota, Opt_grpquota 841}; 842 843static const match_table_t tokens = { 844 {Opt_bsd_df, "bsddf"}, 845 {Opt_minix_df, "minixdf"}, 846 {Opt_grpid, "grpid"}, 847 {Opt_grpid, "bsdgroups"}, 848 {Opt_nogrpid, "nogrpid"}, 849 {Opt_nogrpid, "sysvgroups"}, 850 {Opt_resgid, "resgid=%u"}, 851 {Opt_resuid, "resuid=%u"}, 852 {Opt_sb, "sb=%u"}, 853 {Opt_err_cont, "errors=continue"}, 854 {Opt_err_panic, "errors=panic"}, 855 {Opt_err_ro, "errors=remount-ro"}, 856 {Opt_nouid32, "nouid32"}, 857 {Opt_nocheck, "nocheck"}, 858 {Opt_nocheck, "check=none"}, 859 {Opt_debug, "debug"}, 860 {Opt_oldalloc, "oldalloc"}, 861 {Opt_orlov, "orlov"}, 862 {Opt_user_xattr, "user_xattr"}, 863 {Opt_nouser_xattr, "nouser_xattr"}, 864 {Opt_acl, "acl"}, 865 {Opt_noacl, "noacl"}, 866 {Opt_reservation, "reservation"}, 867 {Opt_noreservation, "noreservation"}, 868 {Opt_noload, "noload"}, 869 {Opt_noload, "norecovery"}, 870 {Opt_nobh, "nobh"}, 871 {Opt_bh, "bh"}, 872 {Opt_commit, "commit=%u"}, 873 {Opt_journal_update, "journal=update"}, 874 {Opt_journal_inum, "journal=%u"}, 875 {Opt_journal_dev, "journal_dev=%u"}, 876 {Opt_journal_path, "journal_path=%s"}, 877 {Opt_abort, "abort"}, 878 {Opt_data_journal, "data=journal"}, 879 {Opt_data_ordered, "data=ordered"}, 880 {Opt_data_writeback, "data=writeback"}, 881 {Opt_data_err_abort, "data_err=abort"}, 882 {Opt_data_err_ignore, "data_err=ignore"}, 883 {Opt_offusrjquota, "usrjquota="}, 884 {Opt_usrjquota, "usrjquota=%s"}, 885 {Opt_offgrpjquota, "grpjquota="}, 886 {Opt_grpjquota, "grpjquota=%s"}, 887 {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, 888 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, 889 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"}, 890 {Opt_grpquota, "grpquota"}, 891 {Opt_noquota, "noquota"}, 892 {Opt_quota, "quota"}, 893 {Opt_usrquota, "usrquota"}, 894 {Opt_barrier, "barrier=%u"}, 895 {Opt_barrier, "barrier"}, 896 {Opt_nobarrier, "nobarrier"}, 897 {Opt_resize, "resize"}, 898 {Opt_err, NULL}, 899}; 900 901static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb) 902{ 903 ext3_fsblk_t sb_block; 904 char *options = (char *) *data; 905 906 if (!options || strncmp(options, "sb=", 3) != 0) 907 return 1; /* Default location */ 908 options += 3; 909 /*todo: use simple_strtoll with >32bit ext3 */ 910 sb_block = simple_strtoul(options, &options, 0); 911 if (*options && *options != ',') { 912 ext3_msg(sb, KERN_ERR, "error: invalid sb specification: %s", 913 (char *) *data); 914 return 1; 915 } 916 if (*options == ',') 917 options++; 918 *data = (void *) options; 919 return sb_block; 920} 921 922#ifdef CONFIG_QUOTA 923static int set_qf_name(struct super_block *sb, int qtype, substring_t *args) 924{ 925 struct ext3_sb_info *sbi = EXT3_SB(sb); 926 char *qname; 927 928 if (sb_any_quota_loaded(sb) && 929 !sbi->s_qf_names[qtype]) { 930 ext3_msg(sb, KERN_ERR, 931 "Cannot change journaled " 932 "quota options when quota turned on"); 933 return 0; 934 } 935 qname = match_strdup(args); 936 if (!qname) { 937 ext3_msg(sb, KERN_ERR, 938 "Not enough memory for storing quotafile name"); 939 return 0; 940 } 941 if (sbi->s_qf_names[qtype]) { 942 int same = !strcmp(sbi->s_qf_names[qtype], qname); 943 944 kfree(qname); 945 if (!same) { 946 ext3_msg(sb, KERN_ERR, 947 "%s quota file already specified", 948 QTYPE2NAME(qtype)); 949 } 950 return same; 951 } 952 if (strchr(qname, '/')) { 953 ext3_msg(sb, KERN_ERR, 954 "quotafile must be on filesystem root"); 955 kfree(qname); 956 return 0; 957 } 958 sbi->s_qf_names[qtype] = qname; 959 set_opt(sbi->s_mount_opt, QUOTA); 960 return 1; 961} 962 963static int clear_qf_name(struct super_block *sb, int qtype) { 964 965 struct ext3_sb_info *sbi = EXT3_SB(sb); 966 967 if (sb_any_quota_loaded(sb) && 968 sbi->s_qf_names[qtype]) { 969 ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options" 970 " when quota turned on"); 971 return 0; 972 } 973 if (sbi->s_qf_names[qtype]) { 974 kfree(sbi->s_qf_names[qtype]); 975 sbi->s_qf_names[qtype] = NULL; 976 } 977 return 1; 978} 979#endif 980 981static int parse_options (char *options, struct super_block *sb, 982 unsigned int *inum, unsigned long *journal_devnum, 983 ext3_fsblk_t *n_blocks_count, int is_remount) 984{ 985 struct ext3_sb_info *sbi = EXT3_SB(sb); 986 char * p; 987 substring_t args[MAX_OPT_ARGS]; 988 int data_opt = 0; 989 int option; 990 kuid_t uid; 991 kgid_t gid; 992 char *journal_path; 993 struct inode *journal_inode; 994 struct path path; 995 int error; 996 997#ifdef CONFIG_QUOTA 998 int qfmt; 999#endif 1000 1001 if (!options) 1002 return 1; 1003 1004 while ((p = strsep (&options, ",")) != NULL) { 1005 int token; 1006 if (!*p) 1007 continue; 1008 /* 1009 * Initialize args struct so we know whether arg was 1010 * found; some options take optional arguments. 1011 */ 1012 args[0].to = args[0].from = NULL; 1013 token = match_token(p, tokens, args); 1014 switch (token) { 1015 case Opt_bsd_df: 1016 clear_opt (sbi->s_mount_opt, MINIX_DF); 1017 break; 1018 case Opt_minix_df: 1019 set_opt (sbi->s_mount_opt, MINIX_DF); 1020 break; 1021 case Opt_grpid: 1022 set_opt (sbi->s_mount_opt, GRPID); 1023 break; 1024 case Opt_nogrpid: 1025 clear_opt (sbi->s_mount_opt, GRPID); 1026 break; 1027 case Opt_resuid: 1028 if (match_int(&args[0], &option)) 1029 return 0; 1030 uid = make_kuid(current_user_ns(), option); 1031 if (!uid_valid(uid)) { 1032 ext3_msg(sb, KERN_ERR, "Invalid uid value %d", option); 1033 return 0; 1034 1035 } 1036 sbi->s_resuid = uid; 1037 break; 1038 case Opt_resgid: 1039 if (match_int(&args[0], &option)) 1040 return 0; 1041 gid = make_kgid(current_user_ns(), option); 1042 if (!gid_valid(gid)) { 1043 ext3_msg(sb, KERN_ERR, "Invalid gid value %d", option); 1044 return 0; 1045 } 1046 sbi->s_resgid = gid; 1047 break; 1048 case Opt_sb: 1049 /* handled by get_sb_block() instead of here */ 1050 /* *sb_block = match_int(&args[0]); */ 1051 break; 1052 case Opt_err_panic: 1053 clear_opt (sbi->s_mount_opt, ERRORS_CONT); 1054 clear_opt (sbi->s_mount_opt, ERRORS_RO); 1055 set_opt (sbi->s_mount_opt, ERRORS_PANIC); 1056 break; 1057 case Opt_err_ro: 1058 clear_opt (sbi->s_mount_opt, ERRORS_CONT); 1059 clear_opt (sbi->s_mount_opt, ERRORS_PANIC); 1060 set_opt (sbi->s_mount_opt, ERRORS_RO); 1061 break; 1062 case Opt_err_cont: 1063 clear_opt (sbi->s_mount_opt, ERRORS_RO); 1064 clear_opt (sbi->s_mount_opt, ERRORS_PANIC); 1065 set_opt (sbi->s_mount_opt, ERRORS_CONT); 1066 break; 1067 case Opt_nouid32: 1068 set_opt (sbi->s_mount_opt, NO_UID32); 1069 break; 1070 case Opt_nocheck: 1071 clear_opt (sbi->s_mount_opt, CHECK); 1072 break; 1073 case Opt_debug: 1074 set_opt (sbi->s_mount_opt, DEBUG); 1075 break; 1076 case Opt_oldalloc: 1077 ext3_msg(sb, KERN_WARNING, 1078 "Ignoring deprecated oldalloc option"); 1079 break; 1080 case Opt_orlov: 1081 ext3_msg(sb, KERN_WARNING, 1082 "Ignoring deprecated orlov option"); 1083 break; 1084#ifdef CONFIG_EXT3_FS_XATTR 1085 case Opt_user_xattr: 1086 set_opt (sbi->s_mount_opt, XATTR_USER); 1087 break; 1088 case Opt_nouser_xattr: 1089 clear_opt (sbi->s_mount_opt, XATTR_USER); 1090 break; 1091#else 1092 case Opt_user_xattr: 1093 case Opt_nouser_xattr: 1094 ext3_msg(sb, KERN_INFO, 1095 "(no)user_xattr options not supported"); 1096 break; 1097#endif 1098#ifdef CONFIG_EXT3_FS_POSIX_ACL 1099 case Opt_acl: 1100 set_opt(sbi->s_mount_opt, POSIX_ACL); 1101 break; 1102 case Opt_noacl: 1103 clear_opt(sbi->s_mount_opt, POSIX_ACL); 1104 break; 1105#else 1106 case Opt_acl: 1107 case Opt_noacl: 1108 ext3_msg(sb, KERN_INFO, 1109 "(no)acl options not supported"); 1110 break; 1111#endif 1112 case Opt_reservation: 1113 set_opt(sbi->s_mount_opt, RESERVATION); 1114 break; 1115 case Opt_noreservation: 1116 clear_opt(sbi->s_mount_opt, RESERVATION); 1117 break; 1118 case Opt_journal_update: 1119 /* @@@ FIXME */ 1120 /* Eventually we will want to be able to create 1121 a journal file here. For now, only allow the 1122 user to specify an existing inode to be the 1123 journal file. */ 1124 if (is_remount) { 1125 ext3_msg(sb, KERN_ERR, "error: cannot specify " 1126 "journal on remount"); 1127 return 0; 1128 } 1129 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL); 1130 break; 1131 case Opt_journal_inum: 1132 if (is_remount) { 1133 ext3_msg(sb, KERN_ERR, "error: cannot specify " 1134 "journal on remount"); 1135 return 0; 1136 } 1137 if (match_int(&args[0], &option)) 1138 return 0; 1139 *inum = option; 1140 break; 1141 case Opt_journal_dev: 1142 if (is_remount) { 1143 ext3_msg(sb, KERN_ERR, "error: cannot specify " 1144 "journal on remount"); 1145 return 0; 1146 } 1147 if (match_int(&args[0], &option)) 1148 return 0; 1149 *journal_devnum = option; 1150 break; 1151 case Opt_journal_path: 1152 if (is_remount) { 1153 ext3_msg(sb, KERN_ERR, "error: cannot specify " 1154 "journal on remount"); 1155 return 0; 1156 } 1157 1158 journal_path = match_strdup(&args[0]); 1159 if (!journal_path) { 1160 ext3_msg(sb, KERN_ERR, "error: could not dup " 1161 "journal device string"); 1162 return 0; 1163 } 1164 1165 error = kern_path(journal_path, LOOKUP_FOLLOW, &path); 1166 if (error) { 1167 ext3_msg(sb, KERN_ERR, "error: could not find " 1168 "journal device path: error %d", error); 1169 kfree(journal_path); 1170 return 0; 1171 } 1172 1173 journal_inode = d_inode(path.dentry); 1174 if (!S_ISBLK(journal_inode->i_mode)) { 1175 ext3_msg(sb, KERN_ERR, "error: journal path %s " 1176 "is not a block device", journal_path); 1177 path_put(&path); 1178 kfree(journal_path); 1179 return 0; 1180 } 1181 1182 *journal_devnum = new_encode_dev(journal_inode->i_rdev); 1183 path_put(&path); 1184 kfree(journal_path); 1185 break; 1186 case Opt_noload: 1187 set_opt (sbi->s_mount_opt, NOLOAD); 1188 break; 1189 case Opt_commit: 1190 if (match_int(&args[0], &option)) 1191 return 0; 1192 if (option < 0) 1193 return 0; 1194 if (option == 0) 1195 option = JBD_DEFAULT_MAX_COMMIT_AGE; 1196 sbi->s_commit_interval = HZ * option; 1197 break; 1198 case Opt_data_journal: 1199 data_opt = EXT3_MOUNT_JOURNAL_DATA; 1200 goto datacheck; 1201 case Opt_data_ordered: 1202 data_opt = EXT3_MOUNT_ORDERED_DATA; 1203 goto datacheck; 1204 case Opt_data_writeback: 1205 data_opt = EXT3_MOUNT_WRITEBACK_DATA; 1206 datacheck: 1207 if (is_remount) { 1208 if (test_opt(sb, DATA_FLAGS) == data_opt) 1209 break; 1210 ext3_msg(sb, KERN_ERR, 1211 "error: cannot change " 1212 "data mode on remount. The filesystem " 1213 "is mounted in data=%s mode and you " 1214 "try to remount it in data=%s mode.", 1215 data_mode_string(test_opt(sb, 1216 DATA_FLAGS)), 1217 data_mode_string(data_opt)); 1218 return 0; 1219 } else { 1220 clear_opt(sbi->s_mount_opt, DATA_FLAGS); 1221 sbi->s_mount_opt |= data_opt; 1222 } 1223 break; 1224 case Opt_data_err_abort: 1225 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT); 1226 break; 1227 case Opt_data_err_ignore: 1228 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT); 1229 break; 1230#ifdef CONFIG_QUOTA 1231 case Opt_usrjquota: 1232 if (!set_qf_name(sb, USRQUOTA, &args[0])) 1233 return 0; 1234 break; 1235 case Opt_grpjquota: 1236 if (!set_qf_name(sb, GRPQUOTA, &args[0])) 1237 return 0; 1238 break; 1239 case Opt_offusrjquota: 1240 if (!clear_qf_name(sb, USRQUOTA)) 1241 return 0; 1242 break; 1243 case Opt_offgrpjquota: 1244 if (!clear_qf_name(sb, GRPQUOTA)) 1245 return 0; 1246 break; 1247 case Opt_jqfmt_vfsold: 1248 qfmt = QFMT_VFS_OLD; 1249 goto set_qf_format; 1250 case Opt_jqfmt_vfsv0: 1251 qfmt = QFMT_VFS_V0; 1252 goto set_qf_format; 1253 case Opt_jqfmt_vfsv1: 1254 qfmt = QFMT_VFS_V1; 1255set_qf_format: 1256 if (sb_any_quota_loaded(sb) && 1257 sbi->s_jquota_fmt != qfmt) { 1258 ext3_msg(sb, KERN_ERR, "error: cannot change " 1259 "journaled quota options when " 1260 "quota turned on."); 1261 return 0; 1262 } 1263 sbi->s_jquota_fmt = qfmt; 1264 break; 1265 case Opt_quota: 1266 case Opt_usrquota: 1267 set_opt(sbi->s_mount_opt, QUOTA); 1268 set_opt(sbi->s_mount_opt, USRQUOTA); 1269 break; 1270 case Opt_grpquota: 1271 set_opt(sbi->s_mount_opt, QUOTA); 1272 set_opt(sbi->s_mount_opt, GRPQUOTA); 1273 break; 1274 case Opt_noquota: 1275 if (sb_any_quota_loaded(sb)) { 1276 ext3_msg(sb, KERN_ERR, "error: cannot change " 1277 "quota options when quota turned on."); 1278 return 0; 1279 } 1280 clear_opt(sbi->s_mount_opt, QUOTA); 1281 clear_opt(sbi->s_mount_opt, USRQUOTA); 1282 clear_opt(sbi->s_mount_opt, GRPQUOTA); 1283 break; 1284#else 1285 case Opt_quota: 1286 case Opt_usrquota: 1287 case Opt_grpquota: 1288 ext3_msg(sb, KERN_ERR, 1289 "error: quota options not supported."); 1290 break; 1291 case Opt_usrjquota: 1292 case Opt_grpjquota: 1293 case Opt_offusrjquota: 1294 case Opt_offgrpjquota: 1295 case Opt_jqfmt_vfsold: 1296 case Opt_jqfmt_vfsv0: 1297 case Opt_jqfmt_vfsv1: 1298 ext3_msg(sb, KERN_ERR, 1299 "error: journaled quota options not " 1300 "supported."); 1301 break; 1302 case Opt_noquota: 1303 break; 1304#endif 1305 case Opt_abort: 1306 set_opt(sbi->s_mount_opt, ABORT); 1307 break; 1308 case Opt_nobarrier: 1309 clear_opt(sbi->s_mount_opt, BARRIER); 1310 break; 1311 case Opt_barrier: 1312 if (args[0].from) { 1313 if (match_int(&args[0], &option)) 1314 return 0; 1315 } else 1316 option = 1; /* No argument, default to 1 */ 1317 if (option) 1318 set_opt(sbi->s_mount_opt, BARRIER); 1319 else 1320 clear_opt(sbi->s_mount_opt, BARRIER); 1321 break; 1322 case Opt_ignore: 1323 break; 1324 case Opt_resize: 1325 if (!is_remount) { 1326 ext3_msg(sb, KERN_ERR, 1327 "error: resize option only available " 1328 "for remount"); 1329 return 0; 1330 } 1331 if (match_int(&args[0], &option) != 0) 1332 return 0; 1333 *n_blocks_count = option; 1334 break; 1335 case Opt_nobh: 1336 ext3_msg(sb, KERN_WARNING, 1337 "warning: ignoring deprecated nobh option"); 1338 break; 1339 case Opt_bh: 1340 ext3_msg(sb, KERN_WARNING, 1341 "warning: ignoring deprecated bh option"); 1342 break; 1343 default: 1344 ext3_msg(sb, KERN_ERR, 1345 "error: unrecognized mount option \"%s\" " 1346 "or missing value", p); 1347 return 0; 1348 } 1349 } 1350#ifdef CONFIG_QUOTA 1351 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { 1352 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA]) 1353 clear_opt(sbi->s_mount_opt, USRQUOTA); 1354 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA]) 1355 clear_opt(sbi->s_mount_opt, GRPQUOTA); 1356 1357 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) { 1358 ext3_msg(sb, KERN_ERR, "error: old and new quota " 1359 "format mixing."); 1360 return 0; 1361 } 1362 1363 if (!sbi->s_jquota_fmt) { 1364 ext3_msg(sb, KERN_ERR, "error: journaled quota format " 1365 "not specified."); 1366 return 0; 1367 } 1368 } 1369#endif 1370 return 1; 1371} 1372 1373static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es, 1374 int read_only) 1375{ 1376 struct ext3_sb_info *sbi = EXT3_SB(sb); 1377 int res = 0; 1378 1379 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) { 1380 ext3_msg(sb, KERN_ERR, 1381 "error: revision level too high, " 1382 "forcing read-only mode"); 1383 res = MS_RDONLY; 1384 } 1385 if (read_only) 1386 return res; 1387 if (!(sbi->s_mount_state & EXT3_VALID_FS)) 1388 ext3_msg(sb, KERN_WARNING, 1389 "warning: mounting unchecked fs, " 1390 "running e2fsck is recommended"); 1391 else if ((sbi->s_mount_state & EXT3_ERROR_FS)) 1392 ext3_msg(sb, KERN_WARNING, 1393 "warning: mounting fs with errors, " 1394 "running e2fsck is recommended"); 1395 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 && 1396 le16_to_cpu(es->s_mnt_count) >= 1397 le16_to_cpu(es->s_max_mnt_count)) 1398 ext3_msg(sb, KERN_WARNING, 1399 "warning: maximal mount count reached, " 1400 "running e2fsck is recommended"); 1401 else if (le32_to_cpu(es->s_checkinterval) && 1402 (le32_to_cpu(es->s_lastcheck) + 1403 le32_to_cpu(es->s_checkinterval) <= get_seconds())) 1404 ext3_msg(sb, KERN_WARNING, 1405 "warning: checktime reached, " 1406 "running e2fsck is recommended"); 1407#if 0 1408 /* @@@ We _will_ want to clear the valid bit if we find 1409 inconsistencies, to force a fsck at reboot. But for 1410 a plain journaled filesystem we can keep it set as 1411 valid forever! :) */ 1412 es->s_state &= cpu_to_le16(~EXT3_VALID_FS); 1413#endif 1414 if (!le16_to_cpu(es->s_max_mnt_count)) 1415 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT); 1416 le16_add_cpu(&es->s_mnt_count, 1); 1417 es->s_mtime = cpu_to_le32(get_seconds()); 1418 ext3_update_dynamic_rev(sb); 1419 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); 1420 1421 ext3_commit_super(sb, es, 1); 1422 if (test_opt(sb, DEBUG)) 1423 ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, " 1424 "bpg=%lu, ipg=%lu, mo=%04lx]", 1425 sb->s_blocksize, 1426 sbi->s_groups_count, 1427 EXT3_BLOCKS_PER_GROUP(sb), 1428 EXT3_INODES_PER_GROUP(sb), 1429 sbi->s_mount_opt); 1430 1431 if (EXT3_SB(sb)->s_journal->j_inode == NULL) { 1432 char b[BDEVNAME_SIZE]; 1433 ext3_msg(sb, KERN_INFO, "using external journal on %s", 1434 bdevname(EXT3_SB(sb)->s_journal->j_dev, b)); 1435 } else { 1436 ext3_msg(sb, KERN_INFO, "using internal journal"); 1437 } 1438 cleancache_init_fs(sb); 1439 return res; 1440} 1441 1442/* Called at mount-time, super-block is locked */ 1443static int ext3_check_descriptors(struct super_block *sb) 1444{ 1445 struct ext3_sb_info *sbi = EXT3_SB(sb); 1446 int i; 1447 1448 ext3_debug ("Checking group descriptors"); 1449 1450 for (i = 0; i < sbi->s_groups_count; i++) { 1451 struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL); 1452 ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i); 1453 ext3_fsblk_t last_block; 1454 1455 if (i == sbi->s_groups_count - 1) 1456 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; 1457 else 1458 last_block = first_block + 1459 (EXT3_BLOCKS_PER_GROUP(sb) - 1); 1460 1461 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || 1462 le32_to_cpu(gdp->bg_block_bitmap) > last_block) 1463 { 1464 ext3_error (sb, "ext3_check_descriptors", 1465 "Block bitmap for group %d" 1466 " not in group (block %lu)!", 1467 i, (unsigned long) 1468 le32_to_cpu(gdp->bg_block_bitmap)); 1469 return 0; 1470 } 1471 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || 1472 le32_to_cpu(gdp->bg_inode_bitmap) > last_block) 1473 { 1474 ext3_error (sb, "ext3_check_descriptors", 1475 "Inode bitmap for group %d" 1476 " not in group (block %lu)!", 1477 i, (unsigned long) 1478 le32_to_cpu(gdp->bg_inode_bitmap)); 1479 return 0; 1480 } 1481 if (le32_to_cpu(gdp->bg_inode_table) < first_block || 1482 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > 1483 last_block) 1484 { 1485 ext3_error (sb, "ext3_check_descriptors", 1486 "Inode table for group %d" 1487 " not in group (block %lu)!", 1488 i, (unsigned long) 1489 le32_to_cpu(gdp->bg_inode_table)); 1490 return 0; 1491 } 1492 } 1493 1494 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb)); 1495 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb)); 1496 return 1; 1497} 1498 1499 1500/* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at 1501 * the superblock) which were deleted from all directories, but held open by 1502 * a process at the time of a crash. We walk the list and try to delete these 1503 * inodes at recovery time (only with a read-write filesystem). 1504 * 1505 * In order to keep the orphan inode chain consistent during traversal (in 1506 * case of crash during recovery), we link each inode into the superblock 1507 * orphan list_head and handle it the same way as an inode deletion during 1508 * normal operation (which journals the operations for us). 1509 * 1510 * We only do an iget() and an iput() on each inode, which is very safe if we 1511 * accidentally point at an in-use or already deleted inode. The worst that 1512 * can happen in this case is that we get a "bit already cleared" message from 1513 * ext3_free_inode(). The only reason we would point at a wrong inode is if 1514 * e2fsck was run on this filesystem, and it must have already done the orphan 1515 * inode cleanup for us, so we can safely abort without any further action. 1516 */ 1517static void ext3_orphan_cleanup (struct super_block * sb, 1518 struct ext3_super_block * es) 1519{ 1520 unsigned int s_flags = sb->s_flags; 1521 int nr_orphans = 0, nr_truncates = 0; 1522#ifdef CONFIG_QUOTA 1523 int i; 1524#endif 1525 if (!es->s_last_orphan) { 1526 jbd_debug(4, "no orphan inodes to clean up\n"); 1527 return; 1528 } 1529 1530 if (bdev_read_only(sb->s_bdev)) { 1531 ext3_msg(sb, KERN_ERR, "error: write access " 1532 "unavailable, skipping orphan cleanup."); 1533 return; 1534 } 1535 1536 /* Check if feature set allows readwrite operations */ 1537 if (EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) { 1538 ext3_msg(sb, KERN_INFO, "Skipping orphan cleanup due to " 1539 "unknown ROCOMPAT features"); 1540 return; 1541 } 1542 1543 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) { 1544 /* don't clear list on RO mount w/ errors */ 1545 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) { 1546 jbd_debug(1, "Errors on filesystem, " 1547 "clearing orphan list.\n"); 1548 es->s_last_orphan = 0; 1549 } 1550 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); 1551 return; 1552 } 1553 1554 if (s_flags & MS_RDONLY) { 1555 ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs"); 1556 sb->s_flags &= ~MS_RDONLY; 1557 } 1558#ifdef CONFIG_QUOTA 1559 /* Needed for iput() to work correctly and not trash data */ 1560 sb->s_flags |= MS_ACTIVE; 1561 /* Turn on quotas so that they are updated correctly */ 1562 for (i = 0; i < EXT3_MAXQUOTAS; i++) { 1563 if (EXT3_SB(sb)->s_qf_names[i]) { 1564 int ret = ext3_quota_on_mount(sb, i); 1565 if (ret < 0) 1566 ext3_msg(sb, KERN_ERR, 1567 "error: cannot turn on journaled " 1568 "quota: %d", ret); 1569 } 1570 } 1571#endif 1572 1573 while (es->s_last_orphan) { 1574 struct inode *inode; 1575 1576 inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); 1577 if (IS_ERR(inode)) { 1578 es->s_last_orphan = 0; 1579 break; 1580 } 1581 1582 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan); 1583 dquot_initialize(inode); 1584 if (inode->i_nlink) { 1585 printk(KERN_DEBUG 1586 "%s: truncating inode %lu to %Ld bytes\n", 1587 __func__, inode->i_ino, inode->i_size); 1588 jbd_debug(2, "truncating inode %lu to %Ld bytes\n", 1589 inode->i_ino, inode->i_size); 1590 ext3_truncate(inode); 1591 nr_truncates++; 1592 } else { 1593 printk(KERN_DEBUG 1594 "%s: deleting unreferenced inode %lu\n", 1595 __func__, inode->i_ino); 1596 jbd_debug(2, "deleting unreferenced inode %lu\n", 1597 inode->i_ino); 1598 nr_orphans++; 1599 } 1600 iput(inode); /* The delete magic happens here! */ 1601 } 1602 1603#define PLURAL(x) (x), ((x)==1) ? "" : "s" 1604 1605 if (nr_orphans) 1606 ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted", 1607 PLURAL(nr_orphans)); 1608 if (nr_truncates) 1609 ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up", 1610 PLURAL(nr_truncates)); 1611#ifdef CONFIG_QUOTA 1612 /* Turn quotas off */ 1613 for (i = 0; i < EXT3_MAXQUOTAS; i++) { 1614 if (sb_dqopt(sb)->files[i]) 1615 dquot_quota_off(sb, i); 1616 } 1617#endif 1618 sb->s_flags = s_flags; /* Restore MS_RDONLY status */ 1619} 1620 1621/* 1622 * Maximal file size. There is a direct, and {,double-,triple-}indirect 1623 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. 1624 * We need to be 1 filesystem block less than the 2^32 sector limit. 1625 */ 1626static loff_t ext3_max_size(int bits) 1627{ 1628 loff_t res = EXT3_NDIR_BLOCKS; 1629 int meta_blocks; 1630 loff_t upper_limit; 1631 1632 /* This is calculated to be the largest file size for a 1633 * dense, file such that the total number of 1634 * sectors in the file, including data and all indirect blocks, 1635 * does not exceed 2^32 -1 1636 * __u32 i_blocks representing the total number of 1637 * 512 bytes blocks of the file 1638 */ 1639 upper_limit = (1LL << 32) - 1; 1640 1641 /* total blocks in file system block size */ 1642 upper_limit >>= (bits - 9); 1643 1644 1645 /* indirect blocks */ 1646 meta_blocks = 1; 1647 /* double indirect blocks */ 1648 meta_blocks += 1 + (1LL << (bits-2)); 1649 /* tripple indirect blocks */ 1650 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); 1651 1652 upper_limit -= meta_blocks; 1653 upper_limit <<= bits; 1654 1655 res += 1LL << (bits-2); 1656 res += 1LL << (2*(bits-2)); 1657 res += 1LL << (3*(bits-2)); 1658 res <<= bits; 1659 if (res > upper_limit) 1660 res = upper_limit; 1661 1662 if (res > MAX_LFS_FILESIZE) 1663 res = MAX_LFS_FILESIZE; 1664 1665 return res; 1666} 1667 1668static ext3_fsblk_t descriptor_loc(struct super_block *sb, 1669 ext3_fsblk_t logic_sb_block, 1670 int nr) 1671{ 1672 struct ext3_sb_info *sbi = EXT3_SB(sb); 1673 unsigned long bg, first_meta_bg; 1674 int has_super = 0; 1675 1676 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 1677 1678 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) || 1679 nr < first_meta_bg) 1680 return (logic_sb_block + nr + 1); 1681 bg = sbi->s_desc_per_block * nr; 1682 if (ext3_bg_has_super(sb, bg)) 1683 has_super = 1; 1684 return (has_super + ext3_group_first_block_no(sb, bg)); 1685} 1686 1687 1688static int ext3_fill_super (struct super_block *sb, void *data, int silent) 1689{ 1690 struct buffer_head * bh; 1691 struct ext3_super_block *es = NULL; 1692 struct ext3_sb_info *sbi; 1693 ext3_fsblk_t block; 1694 ext3_fsblk_t sb_block = get_sb_block(&data, sb); 1695 ext3_fsblk_t logic_sb_block; 1696 unsigned long offset = 0; 1697 unsigned int journal_inum = 0; 1698 unsigned long journal_devnum = 0; 1699 unsigned long def_mount_opts; 1700 struct inode *root; 1701 int blocksize; 1702 int hblock; 1703 int db_count; 1704 int i; 1705 int needs_recovery; 1706 int ret = -EINVAL; 1707 __le32 features; 1708 int err; 1709 1710 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 1711 if (!sbi) 1712 return -ENOMEM; 1713 1714 sbi->s_blockgroup_lock = 1715 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); 1716 if (!sbi->s_blockgroup_lock) { 1717 kfree(sbi); 1718 return -ENOMEM; 1719 } 1720 sb->s_fs_info = sbi; 1721 sbi->s_sb_block = sb_block; 1722 1723 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE); 1724 if (!blocksize) { 1725 ext3_msg(sb, KERN_ERR, "error: unable to set blocksize"); 1726 goto out_fail; 1727 } 1728 1729 /* 1730 * The ext3 superblock will not be buffer aligned for other than 1kB 1731 * block sizes. We need to calculate the offset from buffer start. 1732 */ 1733 if (blocksize != EXT3_MIN_BLOCK_SIZE) { 1734 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize; 1735 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize; 1736 } else { 1737 logic_sb_block = sb_block; 1738 } 1739 1740 if (!(bh = sb_bread(sb, logic_sb_block))) { 1741 ext3_msg(sb, KERN_ERR, "error: unable to read superblock"); 1742 goto out_fail; 1743 } 1744 /* 1745 * Note: s_es must be initialized as soon as possible because 1746 * some ext3 macro-instructions depend on its value 1747 */ 1748 es = (struct ext3_super_block *) (bh->b_data + offset); 1749 sbi->s_es = es; 1750 sb->s_magic = le16_to_cpu(es->s_magic); 1751 if (sb->s_magic != EXT3_SUPER_MAGIC) 1752 goto cantfind_ext3; 1753 1754 /* Set defaults before we parse the mount options */ 1755 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 1756 if (def_mount_opts & EXT3_DEFM_DEBUG) 1757 set_opt(sbi->s_mount_opt, DEBUG); 1758 if (def_mount_opts & EXT3_DEFM_BSDGROUPS) 1759 set_opt(sbi->s_mount_opt, GRPID); 1760 if (def_mount_opts & EXT3_DEFM_UID16) 1761 set_opt(sbi->s_mount_opt, NO_UID32); 1762#ifdef CONFIG_EXT3_FS_XATTR 1763 if (def_mount_opts & EXT3_DEFM_XATTR_USER) 1764 set_opt(sbi->s_mount_opt, XATTR_USER); 1765#endif 1766#ifdef CONFIG_EXT3_FS_POSIX_ACL 1767 if (def_mount_opts & EXT3_DEFM_ACL) 1768 set_opt(sbi->s_mount_opt, POSIX_ACL); 1769#endif 1770 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA) 1771 set_opt(sbi->s_mount_opt, JOURNAL_DATA); 1772 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED) 1773 set_opt(sbi->s_mount_opt, ORDERED_DATA); 1774 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK) 1775 set_opt(sbi->s_mount_opt, WRITEBACK_DATA); 1776 1777 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC) 1778 set_opt(sbi->s_mount_opt, ERRORS_PANIC); 1779 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE) 1780 set_opt(sbi->s_mount_opt, ERRORS_CONT); 1781 else 1782 set_opt(sbi->s_mount_opt, ERRORS_RO); 1783 1784 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); 1785 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); 1786 1787 /* enable barriers by default */ 1788 set_opt(sbi->s_mount_opt, BARRIER); 1789 set_opt(sbi->s_mount_opt, RESERVATION); 1790 1791 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum, 1792 NULL, 0)) 1793 goto failed_mount; 1794 1795 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 1796 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); 1797 1798 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV && 1799 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) || 1800 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 1801 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U))) 1802 ext3_msg(sb, KERN_WARNING, 1803 "warning: feature flags set on rev 0 fs, " 1804 "running e2fsck is recommended"); 1805 /* 1806 * Check feature flags regardless of the revision level, since we 1807 * previously didn't change the revision level when setting the flags, 1808 * so there is a chance incompat flags are set on a rev 0 filesystem. 1809 */ 1810 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP); 1811 if (features) { 1812 ext3_msg(sb, KERN_ERR, 1813 "error: couldn't mount because of unsupported " 1814 "optional features (%x)", le32_to_cpu(features)); 1815 goto failed_mount; 1816 } 1817 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP); 1818 if (!(sb->s_flags & MS_RDONLY) && features) { 1819 ext3_msg(sb, KERN_ERR, 1820 "error: couldn't mount RDWR because of unsupported " 1821 "optional features (%x)", le32_to_cpu(features)); 1822 goto failed_mount; 1823 } 1824 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); 1825 1826 if (blocksize < EXT3_MIN_BLOCK_SIZE || 1827 blocksize > EXT3_MAX_BLOCK_SIZE) { 1828 ext3_msg(sb, KERN_ERR, 1829 "error: couldn't mount because of unsupported " 1830 "filesystem blocksize %d", blocksize); 1831 goto failed_mount; 1832 } 1833 1834 hblock = bdev_logical_block_size(sb->s_bdev); 1835 if (sb->s_blocksize != blocksize) { 1836 /* 1837 * Make sure the blocksize for the filesystem is larger 1838 * than the hardware sectorsize for the machine. 1839 */ 1840 if (blocksize < hblock) { 1841 ext3_msg(sb, KERN_ERR, 1842 "error: fsblocksize %d too small for " 1843 "hardware sectorsize %d", blocksize, hblock); 1844 goto failed_mount; 1845 } 1846 1847 brelse (bh); 1848 if (!sb_set_blocksize(sb, blocksize)) { 1849 ext3_msg(sb, KERN_ERR, 1850 "error: bad blocksize %d", blocksize); 1851 goto out_fail; 1852 } 1853 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize; 1854 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize; 1855 bh = sb_bread(sb, logic_sb_block); 1856 if (!bh) { 1857 ext3_msg(sb, KERN_ERR, 1858 "error: can't read superblock on 2nd try"); 1859 goto failed_mount; 1860 } 1861 es = (struct ext3_super_block *)(bh->b_data + offset); 1862 sbi->s_es = es; 1863 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) { 1864 ext3_msg(sb, KERN_ERR, 1865 "error: magic mismatch"); 1866 goto failed_mount; 1867 } 1868 } 1869 1870 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits); 1871 1872 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) { 1873 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE; 1874 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO; 1875 } else { 1876 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 1877 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 1878 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) || 1879 (!is_power_of_2(sbi->s_inode_size)) || 1880 (sbi->s_inode_size > blocksize)) { 1881 ext3_msg(sb, KERN_ERR, 1882 "error: unsupported inode size: %d", 1883 sbi->s_inode_size); 1884 goto failed_mount; 1885 } 1886 } 1887 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE << 1888 le32_to_cpu(es->s_log_frag_size); 1889 if (blocksize != sbi->s_frag_size) { 1890 ext3_msg(sb, KERN_ERR, 1891 "error: fragsize %lu != blocksize %u (unsupported)", 1892 sbi->s_frag_size, blocksize); 1893 goto failed_mount; 1894 } 1895 sbi->s_frags_per_block = 1; 1896 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 1897 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); 1898 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 1899 if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0) 1900 goto cantfind_ext3; 1901 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb); 1902 if (sbi->s_inodes_per_block == 0) 1903 goto cantfind_ext3; 1904 sbi->s_itb_per_group = sbi->s_inodes_per_group / 1905 sbi->s_inodes_per_block; 1906 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc); 1907 sbi->s_sbh = bh; 1908 sbi->s_mount_state = le16_to_cpu(es->s_state); 1909 sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb)); 1910 sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb)); 1911 for (i=0; i < 4; i++) 1912 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); 1913 sbi->s_def_hash_version = es->s_def_hash_version; 1914 i = le32_to_cpu(es->s_flags); 1915 if (i & EXT2_FLAGS_UNSIGNED_HASH) 1916 sbi->s_hash_unsigned = 3; 1917 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) { 1918#ifdef __CHAR_UNSIGNED__ 1919 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH); 1920 sbi->s_hash_unsigned = 3; 1921#else 1922 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH); 1923#endif 1924 } 1925 1926 if (sbi->s_blocks_per_group > blocksize * 8) { 1927 ext3_msg(sb, KERN_ERR, 1928 "#blocks per group too big: %lu", 1929 sbi->s_blocks_per_group); 1930 goto failed_mount; 1931 } 1932 if (sbi->s_frags_per_group > blocksize * 8) { 1933 ext3_msg(sb, KERN_ERR, 1934 "error: #fragments per group too big: %lu", 1935 sbi->s_frags_per_group); 1936 goto failed_mount; 1937 } 1938 if (sbi->s_inodes_per_group > blocksize * 8) { 1939 ext3_msg(sb, KERN_ERR, 1940 "error: #inodes per group too big: %lu", 1941 sbi->s_inodes_per_group); 1942 goto failed_mount; 1943 } 1944 1945 err = generic_check_addressable(sb->s_blocksize_bits, 1946 le32_to_cpu(es->s_blocks_count)); 1947 if (err) { 1948 ext3_msg(sb, KERN_ERR, 1949 "error: filesystem is too large to mount safely"); 1950 if (sizeof(sector_t) < 8) 1951 ext3_msg(sb, KERN_ERR, 1952 "error: CONFIG_LBDAF not enabled"); 1953 ret = err; 1954 goto failed_mount; 1955 } 1956 1957 if (EXT3_BLOCKS_PER_GROUP(sb) == 0) 1958 goto cantfind_ext3; 1959 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - 1960 le32_to_cpu(es->s_first_data_block) - 1) 1961 / EXT3_BLOCKS_PER_GROUP(sb)) + 1; 1962 db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb)); 1963 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *), 1964 GFP_KERNEL); 1965 if (sbi->s_group_desc == NULL) { 1966 ext3_msg(sb, KERN_ERR, 1967 "error: not enough memory"); 1968 ret = -ENOMEM; 1969 goto failed_mount; 1970 } 1971 1972 bgl_lock_init(sbi->s_blockgroup_lock); 1973 1974 for (i = 0; i < db_count; i++) { 1975 block = descriptor_loc(sb, logic_sb_block, i); 1976 sbi->s_group_desc[i] = sb_bread(sb, block); 1977 if (!sbi->s_group_desc[i]) { 1978 ext3_msg(sb, KERN_ERR, 1979 "error: can't read group descriptor %d", i); 1980 db_count = i; 1981 goto failed_mount2; 1982 } 1983 } 1984 if (!ext3_check_descriptors (sb)) { 1985 ext3_msg(sb, KERN_ERR, 1986 "error: group descriptors corrupted"); 1987 goto failed_mount2; 1988 } 1989 sbi->s_gdb_count = db_count; 1990 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 1991 spin_lock_init(&sbi->s_next_gen_lock); 1992 1993 /* per fileystem reservation list head & lock */ 1994 spin_lock_init(&sbi->s_rsv_window_lock); 1995 sbi->s_rsv_window_root = RB_ROOT; 1996 /* Add a single, static dummy reservation to the start of the 1997 * reservation window list --- it gives us a placeholder for 1998 * append-at-start-of-list which makes the allocation logic 1999 * _much_ simpler. */ 2000 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED; 2001 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED; 2002 sbi->s_rsv_window_head.rsv_alloc_hit = 0; 2003 sbi->s_rsv_window_head.rsv_goal_size = 0; 2004 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head); 2005 2006 /* 2007 * set up enough so that it can read an inode 2008 */ 2009 sb->s_op = &ext3_sops; 2010 sb->s_export_op = &ext3_export_ops; 2011 sb->s_xattr = ext3_xattr_handlers; 2012#ifdef CONFIG_QUOTA 2013 sb->s_qcop = &ext3_qctl_operations; 2014 sb->dq_op = &ext3_quota_operations; 2015 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 2016#endif 2017 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid)); 2018 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ 2019 mutex_init(&sbi->s_orphan_lock); 2020 mutex_init(&sbi->s_resize_lock); 2021 2022 sb->s_root = NULL; 2023 2024 needs_recovery = (es->s_last_orphan != 0 || 2025 EXT3_HAS_INCOMPAT_FEATURE(sb, 2026 EXT3_FEATURE_INCOMPAT_RECOVER)); 2027 2028 /* 2029 * The first inode we look at is the journal inode. Don't try 2030 * root first: it may be modified in the journal! 2031 */ 2032 if (!test_opt(sb, NOLOAD) && 2033 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) { 2034 if (ext3_load_journal(sb, es, journal_devnum)) 2035 goto failed_mount2; 2036 } else if (journal_inum) { 2037 if (ext3_create_journal(sb, es, journal_inum)) 2038 goto failed_mount2; 2039 } else { 2040 if (!silent) 2041 ext3_msg(sb, KERN_ERR, 2042 "error: no journal found. " 2043 "mounting ext3 over ext2?"); 2044 goto failed_mount2; 2045 } 2046 err = percpu_counter_init(&sbi->s_freeblocks_counter, 2047 ext3_count_free_blocks(sb), GFP_KERNEL); 2048 if (!err) { 2049 err = percpu_counter_init(&sbi->s_freeinodes_counter, 2050 ext3_count_free_inodes(sb), GFP_KERNEL); 2051 } 2052 if (!err) { 2053 err = percpu_counter_init(&sbi->s_dirs_counter, 2054 ext3_count_dirs(sb), GFP_KERNEL); 2055 } 2056 if (err) { 2057 ext3_msg(sb, KERN_ERR, "error: insufficient memory"); 2058 ret = err; 2059 goto failed_mount3; 2060 } 2061 2062 /* We have now updated the journal if required, so we can 2063 * validate the data journaling mode. */ 2064 switch (test_opt(sb, DATA_FLAGS)) { 2065 case 0: 2066 /* No mode set, assume a default based on the journal 2067 capabilities: ORDERED_DATA if the journal can 2068 cope, else JOURNAL_DATA */ 2069 if (journal_check_available_features 2070 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) 2071 set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE); 2072 else 2073 set_opt(sbi->s_mount_opt, JOURNAL_DATA); 2074 break; 2075 2076 case EXT3_MOUNT_ORDERED_DATA: 2077 case EXT3_MOUNT_WRITEBACK_DATA: 2078 if (!journal_check_available_features 2079 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) { 2080 ext3_msg(sb, KERN_ERR, 2081 "error: journal does not support " 2082 "requested data journaling mode"); 2083 goto failed_mount3; 2084 } 2085 default: 2086 break; 2087 } 2088 2089 /* 2090 * The journal_load will have done any necessary log recovery, 2091 * so we can safely mount the rest of the filesystem now. 2092 */ 2093 2094 root = ext3_iget(sb, EXT3_ROOT_INO); 2095 if (IS_ERR(root)) { 2096 ext3_msg(sb, KERN_ERR, "error: get root inode failed"); 2097 ret = PTR_ERR(root); 2098 goto failed_mount3; 2099 } 2100 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 2101 iput(root); 2102 ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); 2103 goto failed_mount3; 2104 } 2105 sb->s_root = d_make_root(root); 2106 if (!sb->s_root) { 2107 ext3_msg(sb, KERN_ERR, "error: get root dentry failed"); 2108 ret = -ENOMEM; 2109 goto failed_mount3; 2110 } 2111 2112 if (ext3_setup_super(sb, es, sb->s_flags & MS_RDONLY)) 2113 sb->s_flags |= MS_RDONLY; 2114 2115 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS; 2116 ext3_orphan_cleanup(sb, es); 2117 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS; 2118 if (needs_recovery) { 2119 ext3_mark_recovery_complete(sb, es); 2120 ext3_msg(sb, KERN_INFO, "recovery complete"); 2121 } 2122 ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode", 2123 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal": 2124 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered": 2125 "writeback"); 2126 2127 return 0; 2128 2129cantfind_ext3: 2130 if (!silent) 2131 ext3_msg(sb, KERN_INFO, 2132 "error: can't find ext3 filesystem on dev %s.", 2133 sb->s_id); 2134 goto failed_mount; 2135 2136failed_mount3: 2137 percpu_counter_destroy(&sbi->s_freeblocks_counter); 2138 percpu_counter_destroy(&sbi->s_freeinodes_counter); 2139 percpu_counter_destroy(&sbi->s_dirs_counter); 2140 journal_destroy(sbi->s_journal); 2141failed_mount2: 2142 for (i = 0; i < db_count; i++) 2143 brelse(sbi->s_group_desc[i]); 2144 kfree(sbi->s_group_desc); 2145failed_mount: 2146#ifdef CONFIG_QUOTA 2147 for (i = 0; i < EXT3_MAXQUOTAS; i++) 2148 kfree(sbi->s_qf_names[i]); 2149#endif 2150 ext3_blkdev_remove(sbi); 2151 brelse(bh); 2152out_fail: 2153 sb->s_fs_info = NULL; 2154 kfree(sbi->s_blockgroup_lock); 2155 kfree(sbi); 2156 return ret; 2157} 2158 2159/* 2160 * Setup any per-fs journal parameters now. We'll do this both on 2161 * initial mount, once the journal has been initialised but before we've 2162 * done any recovery; and again on any subsequent remount. 2163 */ 2164static void ext3_init_journal_params(struct super_block *sb, journal_t *journal) 2165{ 2166 struct ext3_sb_info *sbi = EXT3_SB(sb); 2167 2168 if (sbi->s_commit_interval) 2169 journal->j_commit_interval = sbi->s_commit_interval; 2170 /* We could also set up an ext3-specific default for the commit 2171 * interval here, but for now we'll just fall back to the jbd 2172 * default. */ 2173 2174 spin_lock(&journal->j_state_lock); 2175 if (test_opt(sb, BARRIER)) 2176 journal->j_flags |= JFS_BARRIER; 2177 else 2178 journal->j_flags &= ~JFS_BARRIER; 2179 if (test_opt(sb, DATA_ERR_ABORT)) 2180 journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR; 2181 else 2182 journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR; 2183 spin_unlock(&journal->j_state_lock); 2184} 2185 2186static journal_t *ext3_get_journal(struct super_block *sb, 2187 unsigned int journal_inum) 2188{ 2189 struct inode *journal_inode; 2190 journal_t *journal; 2191 2192 /* First, test for the existence of a valid inode on disk. Bad 2193 * things happen if we iget() an unused inode, as the subsequent 2194 * iput() will try to delete it. */ 2195 2196 journal_inode = ext3_iget(sb, journal_inum); 2197 if (IS_ERR(journal_inode)) { 2198 ext3_msg(sb, KERN_ERR, "error: no journal found"); 2199 return NULL; 2200 } 2201 if (!journal_inode->i_nlink) { 2202 make_bad_inode(journal_inode); 2203 iput(journal_inode); 2204 ext3_msg(sb, KERN_ERR, "error: journal inode is deleted"); 2205 return NULL; 2206 } 2207 2208 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n", 2209 journal_inode, journal_inode->i_size); 2210 if (!S_ISREG(journal_inode->i_mode)) { 2211 ext3_msg(sb, KERN_ERR, "error: invalid journal inode"); 2212 iput(journal_inode); 2213 return NULL; 2214 } 2215 2216 journal = journal_init_inode(journal_inode); 2217 if (!journal) { 2218 ext3_msg(sb, KERN_ERR, "error: could not load journal inode"); 2219 iput(journal_inode); 2220 return NULL; 2221 } 2222 journal->j_private = sb; 2223 ext3_init_journal_params(sb, journal); 2224 return journal; 2225} 2226 2227static journal_t *ext3_get_dev_journal(struct super_block *sb, 2228 dev_t j_dev) 2229{ 2230 struct buffer_head * bh; 2231 journal_t *journal; 2232 ext3_fsblk_t start; 2233 ext3_fsblk_t len; 2234 int hblock, blocksize; 2235 ext3_fsblk_t sb_block; 2236 unsigned long offset; 2237 struct ext3_super_block * es; 2238 struct block_device *bdev; 2239 2240 bdev = ext3_blkdev_get(j_dev, sb); 2241 if (bdev == NULL) 2242 return NULL; 2243 2244 blocksize = sb->s_blocksize; 2245 hblock = bdev_logical_block_size(bdev); 2246 if (blocksize < hblock) { 2247 ext3_msg(sb, KERN_ERR, 2248 "error: blocksize too small for journal device"); 2249 goto out_bdev; 2250 } 2251 2252 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize; 2253 offset = EXT3_MIN_BLOCK_SIZE % blocksize; 2254 set_blocksize(bdev, blocksize); 2255 if (!(bh = __bread(bdev, sb_block, blocksize))) { 2256 ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of " 2257 "external journal"); 2258 goto out_bdev; 2259 } 2260 2261 es = (struct ext3_super_block *) (bh->b_data + offset); 2262 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) || 2263 !(le32_to_cpu(es->s_feature_incompat) & 2264 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) { 2265 ext3_msg(sb, KERN_ERR, "error: external journal has " 2266 "bad superblock"); 2267 brelse(bh); 2268 goto out_bdev; 2269 } 2270 2271 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { 2272 ext3_msg(sb, KERN_ERR, "error: journal UUID does not match"); 2273 brelse(bh); 2274 goto out_bdev; 2275 } 2276 2277 len = le32_to_cpu(es->s_blocks_count); 2278 start = sb_block + 1; 2279 brelse(bh); /* we're done with the superblock */ 2280 2281 journal = journal_init_dev(bdev, sb->s_bdev, 2282 start, len, blocksize); 2283 if (!journal) { 2284 ext3_msg(sb, KERN_ERR, 2285 "error: failed to create device journal"); 2286 goto out_bdev; 2287 } 2288 journal->j_private = sb; 2289 if (!bh_uptodate_or_lock(journal->j_sb_buffer)) { 2290 if (bh_submit_read(journal->j_sb_buffer)) { 2291 ext3_msg(sb, KERN_ERR, "I/O error on journal device"); 2292 goto out_journal; 2293 } 2294 } 2295 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { 2296 ext3_msg(sb, KERN_ERR, 2297 "error: external journal has more than one " 2298 "user (unsupported) - %d", 2299 be32_to_cpu(journal->j_superblock->s_nr_users)); 2300 goto out_journal; 2301 } 2302 EXT3_SB(sb)->journal_bdev = bdev; 2303 ext3_init_journal_params(sb, journal); 2304 return journal; 2305out_journal: 2306 journal_destroy(journal); 2307out_bdev: 2308 ext3_blkdev_put(bdev); 2309 return NULL; 2310} 2311 2312static int ext3_load_journal(struct super_block *sb, 2313 struct ext3_super_block *es, 2314 unsigned long journal_devnum) 2315{ 2316 journal_t *journal; 2317 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); 2318 dev_t journal_dev; 2319 int err = 0; 2320 int really_read_only; 2321 2322 if (journal_devnum && 2323 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 2324 ext3_msg(sb, KERN_INFO, "external journal device major/minor " 2325 "numbers have changed"); 2326 journal_dev = new_decode_dev(journal_devnum); 2327 } else 2328 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); 2329 2330 really_read_only = bdev_read_only(sb->s_bdev); 2331 2332 /* 2333 * Are we loading a blank journal or performing recovery after a 2334 * crash? For recovery, we need to check in advance whether we 2335 * can get read-write access to the device. 2336 */ 2337 2338 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) { 2339 if (sb->s_flags & MS_RDONLY) { 2340 ext3_msg(sb, KERN_INFO, 2341 "recovery required on readonly filesystem"); 2342 if (really_read_only) { 2343 ext3_msg(sb, KERN_ERR, "error: write access " 2344 "unavailable, cannot proceed"); 2345 return -EROFS; 2346 } 2347 ext3_msg(sb, KERN_INFO, 2348 "write access will be enabled during recovery"); 2349 } 2350 } 2351 2352 if (journal_inum && journal_dev) { 2353 ext3_msg(sb, KERN_ERR, "error: filesystem has both journal " 2354 "and inode journals"); 2355 return -EINVAL; 2356 } 2357 2358 if (journal_inum) { 2359 if (!(journal = ext3_get_journal(sb, journal_inum))) 2360 return -EINVAL; 2361 } else { 2362 if (!(journal = ext3_get_dev_journal(sb, journal_dev))) 2363 return -EINVAL; 2364 } 2365 2366 if (!(journal->j_flags & JFS_BARRIER)) 2367 printk(KERN_INFO "EXT3-fs: barriers not enabled\n"); 2368 2369 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { 2370 err = journal_update_format(journal); 2371 if (err) { 2372 ext3_msg(sb, KERN_ERR, "error updating journal"); 2373 journal_destroy(journal); 2374 return err; 2375 } 2376 } 2377 2378 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) 2379 err = journal_wipe(journal, !really_read_only); 2380 if (!err) 2381 err = journal_load(journal); 2382 2383 if (err) { 2384 ext3_msg(sb, KERN_ERR, "error loading journal"); 2385 journal_destroy(journal); 2386 return err; 2387 } 2388 2389 EXT3_SB(sb)->s_journal = journal; 2390 ext3_clear_journal_err(sb, es); 2391 2392 if (!really_read_only && journal_devnum && 2393 journal_devnum != le32_to_cpu(es->s_journal_dev)) { 2394 es->s_journal_dev = cpu_to_le32(journal_devnum); 2395 2396 /* Make sure we flush the recovery flag to disk. */ 2397 ext3_commit_super(sb, es, 1); 2398 } 2399 2400 return 0; 2401} 2402 2403static int ext3_create_journal(struct super_block *sb, 2404 struct ext3_super_block *es, 2405 unsigned int journal_inum) 2406{ 2407 journal_t *journal; 2408 int err; 2409 2410 if (sb->s_flags & MS_RDONLY) { 2411 ext3_msg(sb, KERN_ERR, 2412 "error: readonly filesystem when trying to " 2413 "create journal"); 2414 return -EROFS; 2415 } 2416 2417 journal = ext3_get_journal(sb, journal_inum); 2418 if (!journal) 2419 return -EINVAL; 2420 2421 ext3_msg(sb, KERN_INFO, "creating new journal on inode %u", 2422 journal_inum); 2423 2424 err = journal_create(journal); 2425 if (err) { 2426 ext3_msg(sb, KERN_ERR, "error creating journal"); 2427 journal_destroy(journal); 2428 return -EIO; 2429 } 2430 2431 EXT3_SB(sb)->s_journal = journal; 2432 2433 ext3_update_dynamic_rev(sb); 2434 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); 2435 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL); 2436 2437 es->s_journal_inum = cpu_to_le32(journal_inum); 2438 2439 /* Make sure we flush the recovery flag to disk. */ 2440 ext3_commit_super(sb, es, 1); 2441 2442 return 0; 2443} 2444 2445static int ext3_commit_super(struct super_block *sb, 2446 struct ext3_super_block *es, 2447 int sync) 2448{ 2449 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh; 2450 int error = 0; 2451 2452 if (!sbh) 2453 return error; 2454 2455 if (buffer_write_io_error(sbh)) { 2456 /* 2457 * Oh, dear. A previous attempt to write the 2458 * superblock failed. This could happen because the 2459 * USB device was yanked out. Or it could happen to 2460 * be a transient write error and maybe the block will 2461 * be remapped. Nothing we can do but to retry the 2462 * write and hope for the best. 2463 */ 2464 ext3_msg(sb, KERN_ERR, "previous I/O error to " 2465 "superblock detected"); 2466 clear_buffer_write_io_error(sbh); 2467 set_buffer_uptodate(sbh); 2468 } 2469 /* 2470 * If the file system is mounted read-only, don't update the 2471 * superblock write time. This avoids updating the superblock 2472 * write time when we are mounting the root file system 2473 * read/only but we need to replay the journal; at that point, 2474 * for people who are east of GMT and who make their clock 2475 * tick in localtime for Windows bug-for-bug compatibility, 2476 * the clock is set in the future, and this will cause e2fsck 2477 * to complain and force a full file system check. 2478 */ 2479 if (!(sb->s_flags & MS_RDONLY)) 2480 es->s_wtime = cpu_to_le32(get_seconds()); 2481 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb)); 2482 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb)); 2483 BUFFER_TRACE(sbh, "marking dirty"); 2484 mark_buffer_dirty(sbh); 2485 if (sync) { 2486 error = sync_dirty_buffer(sbh); 2487 if (buffer_write_io_error(sbh)) { 2488 ext3_msg(sb, KERN_ERR, "I/O error while writing " 2489 "superblock"); 2490 clear_buffer_write_io_error(sbh); 2491 set_buffer_uptodate(sbh); 2492 } 2493 } 2494 return error; 2495} 2496 2497 2498/* 2499 * Have we just finished recovery? If so, and if we are mounting (or 2500 * remounting) the filesystem readonly, then we will end up with a 2501 * consistent fs on disk. Record that fact. 2502 */ 2503static void ext3_mark_recovery_complete(struct super_block * sb, 2504 struct ext3_super_block * es) 2505{ 2506 journal_t *journal = EXT3_SB(sb)->s_journal; 2507 2508 journal_lock_updates(journal); 2509 if (journal_flush(journal) < 0) 2510 goto out; 2511 2512 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) && 2513 sb->s_flags & MS_RDONLY) { 2514 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); 2515 ext3_commit_super(sb, es, 1); 2516 } 2517 2518out: 2519 journal_unlock_updates(journal); 2520} 2521 2522/* 2523 * If we are mounting (or read-write remounting) a filesystem whose journal 2524 * has recorded an error from a previous lifetime, move that error to the 2525 * main filesystem now. 2526 */ 2527static void ext3_clear_journal_err(struct super_block *sb, 2528 struct ext3_super_block *es) 2529{ 2530 journal_t *journal; 2531 int j_errno; 2532 const char *errstr; 2533 2534 journal = EXT3_SB(sb)->s_journal; 2535 2536 /* 2537 * Now check for any error status which may have been recorded in the 2538 * journal by a prior ext3_error() or ext3_abort() 2539 */ 2540 2541 j_errno = journal_errno(journal); 2542 if (j_errno) { 2543 char nbuf[16]; 2544 2545 errstr = ext3_decode_error(sb, j_errno, nbuf); 2546 ext3_warning(sb, __func__, "Filesystem error recorded " 2547 "from previous mount: %s", errstr); 2548 ext3_warning(sb, __func__, "Marking fs in need of " 2549 "filesystem check."); 2550 2551 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS; 2552 es->s_state |= cpu_to_le16(EXT3_ERROR_FS); 2553 ext3_commit_super (sb, es, 1); 2554 2555 journal_clear_err(journal); 2556 } 2557} 2558 2559/* 2560 * Force the running and committing transactions to commit, 2561 * and wait on the commit. 2562 */ 2563int ext3_force_commit(struct super_block *sb) 2564{ 2565 journal_t *journal; 2566 int ret; 2567 2568 if (sb->s_flags & MS_RDONLY) 2569 return 0; 2570 2571 journal = EXT3_SB(sb)->s_journal; 2572 ret = ext3_journal_force_commit(journal); 2573 return ret; 2574} 2575 2576static int ext3_sync_fs(struct super_block *sb, int wait) 2577{ 2578 tid_t target; 2579 2580 trace_ext3_sync_fs(sb, wait); 2581 /* 2582 * Writeback quota in non-journalled quota case - journalled quota has 2583 * no dirty dquots 2584 */ 2585 dquot_writeback_dquots(sb, -1); 2586 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) { 2587 if (wait) 2588 log_wait_commit(EXT3_SB(sb)->s_journal, target); 2589 } 2590 return 0; 2591} 2592 2593/* 2594 * LVM calls this function before a (read-only) snapshot is created. This 2595 * gives us a chance to flush the journal completely and mark the fs clean. 2596 */ 2597static int ext3_freeze(struct super_block *sb) 2598{ 2599 int error = 0; 2600 journal_t *journal; 2601 2602 if (!(sb->s_flags & MS_RDONLY)) { 2603 journal = EXT3_SB(sb)->s_journal; 2604 2605 /* Now we set up the journal barrier. */ 2606 journal_lock_updates(journal); 2607 2608 /* 2609 * We don't want to clear needs_recovery flag when we failed 2610 * to flush the journal. 2611 */ 2612 error = journal_flush(journal); 2613 if (error < 0) 2614 goto out; 2615 2616 /* Journal blocked and flushed, clear needs_recovery flag. */ 2617 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); 2618 error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1); 2619 if (error) 2620 goto out; 2621 } 2622 return 0; 2623 2624out: 2625 journal_unlock_updates(journal); 2626 return error; 2627} 2628 2629/* 2630 * Called by LVM after the snapshot is done. We need to reset the RECOVER 2631 * flag here, even though the filesystem is not technically dirty yet. 2632 */ 2633static int ext3_unfreeze(struct super_block *sb) 2634{ 2635 if (!(sb->s_flags & MS_RDONLY)) { 2636 /* Reser the needs_recovery flag before the fs is unlocked. */ 2637 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); 2638 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1); 2639 journal_unlock_updates(EXT3_SB(sb)->s_journal); 2640 } 2641 return 0; 2642} 2643 2644static int ext3_remount (struct super_block * sb, int * flags, char * data) 2645{ 2646 struct ext3_super_block * es; 2647 struct ext3_sb_info *sbi = EXT3_SB(sb); 2648 ext3_fsblk_t n_blocks_count = 0; 2649 unsigned long old_sb_flags; 2650 struct ext3_mount_options old_opts; 2651 int enable_quota = 0; 2652 int err; 2653#ifdef CONFIG_QUOTA 2654 int i; 2655#endif 2656 2657 sync_filesystem(sb); 2658 2659 /* Store the original options */ 2660 old_sb_flags = sb->s_flags; 2661 old_opts.s_mount_opt = sbi->s_mount_opt; 2662 old_opts.s_resuid = sbi->s_resuid; 2663 old_opts.s_resgid = sbi->s_resgid; 2664 old_opts.s_commit_interval = sbi->s_commit_interval; 2665#ifdef CONFIG_QUOTA 2666 old_opts.s_jquota_fmt = sbi->s_jquota_fmt; 2667 for (i = 0; i < EXT3_MAXQUOTAS; i++) 2668 if (sbi->s_qf_names[i]) { 2669 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i], 2670 GFP_KERNEL); 2671 if (!old_opts.s_qf_names[i]) { 2672 int j; 2673 2674 for (j = 0; j < i; j++) 2675 kfree(old_opts.s_qf_names[j]); 2676 return -ENOMEM; 2677 } 2678 } else 2679 old_opts.s_qf_names[i] = NULL; 2680#endif 2681 2682 /* 2683 * Allow the "check" option to be passed as a remount option. 2684 */ 2685 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) { 2686 err = -EINVAL; 2687 goto restore_opts; 2688 } 2689 2690 if (test_opt(sb, ABORT)) 2691 ext3_abort(sb, __func__, "Abort forced by user"); 2692 2693 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 2694 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); 2695 2696 es = sbi->s_es; 2697 2698 ext3_init_journal_params(sb, sbi->s_journal); 2699 2700 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || 2701 n_blocks_count > le32_to_cpu(es->s_blocks_count)) { 2702 if (test_opt(sb, ABORT)) { 2703 err = -EROFS; 2704 goto restore_opts; 2705 } 2706 2707 if (*flags & MS_RDONLY) { 2708 err = dquot_suspend(sb, -1); 2709 if (err < 0) 2710 goto restore_opts; 2711 2712 /* 2713 * First of all, the unconditional stuff we have to do 2714 * to disable replay of the journal when we next remount 2715 */ 2716 sb->s_flags |= MS_RDONLY; 2717 2718 /* 2719 * OK, test if we are remounting a valid rw partition 2720 * readonly, and if so set the rdonly flag and then 2721 * mark the partition as valid again. 2722 */ 2723 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) && 2724 (sbi->s_mount_state & EXT3_VALID_FS)) 2725 es->s_state = cpu_to_le16(sbi->s_mount_state); 2726 2727 ext3_mark_recovery_complete(sb, es); 2728 } else { 2729 __le32 ret; 2730 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb, 2731 ~EXT3_FEATURE_RO_COMPAT_SUPP))) { 2732 ext3_msg(sb, KERN_WARNING, 2733 "warning: couldn't remount RDWR " 2734 "because of unsupported optional " 2735 "features (%x)", le32_to_cpu(ret)); 2736 err = -EROFS; 2737 goto restore_opts; 2738 } 2739 2740 /* 2741 * If we have an unprocessed orphan list hanging 2742 * around from a previously readonly bdev mount, 2743 * require a full umount & mount for now. 2744 */ 2745 if (es->s_last_orphan) { 2746 ext3_msg(sb, KERN_WARNING, "warning: couldn't " 2747 "remount RDWR because of unprocessed " 2748 "orphan inode list. Please " 2749 "umount & mount instead."); 2750 err = -EINVAL; 2751 goto restore_opts; 2752 } 2753 2754 /* 2755 * Mounting a RDONLY partition read-write, so reread 2756 * and store the current valid flag. (It may have 2757 * been changed by e2fsck since we originally mounted 2758 * the partition.) 2759 */ 2760 ext3_clear_journal_err(sb, es); 2761 sbi->s_mount_state = le16_to_cpu(es->s_state); 2762 if ((err = ext3_group_extend(sb, es, n_blocks_count))) 2763 goto restore_opts; 2764 if (!ext3_setup_super (sb, es, 0)) 2765 sb->s_flags &= ~MS_RDONLY; 2766 enable_quota = 1; 2767 } 2768 } 2769#ifdef CONFIG_QUOTA 2770 /* Release old quota file names */ 2771 for (i = 0; i < EXT3_MAXQUOTAS; i++) 2772 kfree(old_opts.s_qf_names[i]); 2773#endif 2774 if (enable_quota) 2775 dquot_resume(sb, -1); 2776 return 0; 2777restore_opts: 2778 sb->s_flags = old_sb_flags; 2779 sbi->s_mount_opt = old_opts.s_mount_opt; 2780 sbi->s_resuid = old_opts.s_resuid; 2781 sbi->s_resgid = old_opts.s_resgid; 2782 sbi->s_commit_interval = old_opts.s_commit_interval; 2783#ifdef CONFIG_QUOTA 2784 sbi->s_jquota_fmt = old_opts.s_jquota_fmt; 2785 for (i = 0; i < EXT3_MAXQUOTAS; i++) { 2786 kfree(sbi->s_qf_names[i]); 2787 sbi->s_qf_names[i] = old_opts.s_qf_names[i]; 2788 } 2789#endif 2790 return err; 2791} 2792 2793static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf) 2794{ 2795 struct super_block *sb = dentry->d_sb; 2796 struct ext3_sb_info *sbi = EXT3_SB(sb); 2797 struct ext3_super_block *es = sbi->s_es; 2798 u64 fsid; 2799 2800 if (test_opt(sb, MINIX_DF)) { 2801 sbi->s_overhead_last = 0; 2802 } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { 2803 unsigned long ngroups = sbi->s_groups_count, i; 2804 ext3_fsblk_t overhead = 0; 2805 smp_rmb(); 2806 2807 /* 2808 * Compute the overhead (FS structures). This is constant 2809 * for a given filesystem unless the number of block groups 2810 * changes so we cache the previous value until it does. 2811 */ 2812 2813 /* 2814 * All of the blocks before first_data_block are 2815 * overhead 2816 */ 2817 overhead = le32_to_cpu(es->s_first_data_block); 2818 2819 /* 2820 * Add the overhead attributed to the superblock and 2821 * block group descriptors. If the sparse superblocks 2822 * feature is turned on, then not all groups have this. 2823 */ 2824 for (i = 0; i < ngroups; i++) { 2825 overhead += ext3_bg_has_super(sb, i) + 2826 ext3_bg_num_gdb(sb, i); 2827 cond_resched(); 2828 } 2829 2830 /* 2831 * Every block group has an inode bitmap, a block 2832 * bitmap, and an inode table. 2833 */ 2834 overhead += ngroups * (2 + sbi->s_itb_per_group); 2835 2836 /* Add the internal journal blocks as well */ 2837 if (sbi->s_journal && !sbi->journal_bdev) 2838 overhead += sbi->s_journal->j_maxlen; 2839 2840 sbi->s_overhead_last = overhead; 2841 smp_wmb(); 2842 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); 2843 } 2844 2845 buf->f_type = EXT3_SUPER_MAGIC; 2846 buf->f_bsize = sb->s_blocksize; 2847 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; 2848 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter); 2849 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); 2850 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) 2851 buf->f_bavail = 0; 2852 buf->f_files = le32_to_cpu(es->s_inodes_count); 2853 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); 2854 buf->f_namelen = EXT3_NAME_LEN; 2855 fsid = le64_to_cpup((void *)es->s_uuid) ^ 2856 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 2857 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 2858 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 2859 return 0; 2860} 2861 2862/* Helper function for writing quotas on sync - we need to start transaction before quota file 2863 * is locked for write. Otherwise the are possible deadlocks: 2864 * Process 1 Process 2 2865 * ext3_create() quota_sync() 2866 * journal_start() write_dquot() 2867 * dquot_initialize() down(dqio_mutex) 2868 * down(dqio_mutex) journal_start() 2869 * 2870 */ 2871 2872#ifdef CONFIG_QUOTA 2873 2874static inline struct inode *dquot_to_inode(struct dquot *dquot) 2875{ 2876 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type]; 2877} 2878 2879static int ext3_write_dquot(struct dquot *dquot) 2880{ 2881 int ret, err; 2882 handle_t *handle; 2883 struct inode *inode; 2884 2885 inode = dquot_to_inode(dquot); 2886 handle = ext3_journal_start(inode, 2887 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); 2888 if (IS_ERR(handle)) 2889 return PTR_ERR(handle); 2890 ret = dquot_commit(dquot); 2891 err = ext3_journal_stop(handle); 2892 if (!ret) 2893 ret = err; 2894 return ret; 2895} 2896 2897static int ext3_acquire_dquot(struct dquot *dquot) 2898{ 2899 int ret, err; 2900 handle_t *handle; 2901 2902 handle = ext3_journal_start(dquot_to_inode(dquot), 2903 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb)); 2904 if (IS_ERR(handle)) 2905 return PTR_ERR(handle); 2906 ret = dquot_acquire(dquot); 2907 err = ext3_journal_stop(handle); 2908 if (!ret) 2909 ret = err; 2910 return ret; 2911} 2912 2913static int ext3_release_dquot(struct dquot *dquot) 2914{ 2915 int ret, err; 2916 handle_t *handle; 2917 2918 handle = ext3_journal_start(dquot_to_inode(dquot), 2919 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb)); 2920 if (IS_ERR(handle)) { 2921 /* Release dquot anyway to avoid endless cycle in dqput() */ 2922 dquot_release(dquot); 2923 return PTR_ERR(handle); 2924 } 2925 ret = dquot_release(dquot); 2926 err = ext3_journal_stop(handle); 2927 if (!ret) 2928 ret = err; 2929 return ret; 2930} 2931 2932static int ext3_mark_dquot_dirty(struct dquot *dquot) 2933{ 2934 /* Are we journaling quotas? */ 2935 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || 2936 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { 2937 dquot_mark_dquot_dirty(dquot); 2938 return ext3_write_dquot(dquot); 2939 } else { 2940 return dquot_mark_dquot_dirty(dquot); 2941 } 2942} 2943 2944static int ext3_write_info(struct super_block *sb, int type) 2945{ 2946 int ret, err; 2947 handle_t *handle; 2948 2949 /* Data block + inode block */ 2950 handle = ext3_journal_start(d_inode(sb->s_root), 2); 2951 if (IS_ERR(handle)) 2952 return PTR_ERR(handle); 2953 ret = dquot_commit_info(sb, type); 2954 err = ext3_journal_stop(handle); 2955 if (!ret) 2956 ret = err; 2957 return ret; 2958} 2959 2960/* 2961 * Turn on quotas during mount time - we need to find 2962 * the quota file and such... 2963 */ 2964static int ext3_quota_on_mount(struct super_block *sb, int type) 2965{ 2966 return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type], 2967 EXT3_SB(sb)->s_jquota_fmt, type); 2968} 2969 2970/* 2971 * Standard function to be called on quota_on 2972 */ 2973static int ext3_quota_on(struct super_block *sb, int type, int format_id, 2974 struct path *path) 2975{ 2976 int err; 2977 2978 if (!test_opt(sb, QUOTA)) 2979 return -EINVAL; 2980 2981 /* Quotafile not on the same filesystem? */ 2982 if (path->dentry->d_sb != sb) 2983 return -EXDEV; 2984 /* Journaling quota? */ 2985 if (EXT3_SB(sb)->s_qf_names[type]) { 2986 /* Quotafile not of fs root? */ 2987 if (path->dentry->d_parent != sb->s_root) 2988 ext3_msg(sb, KERN_WARNING, 2989 "warning: Quota file not on filesystem root. " 2990 "Journaled quota will not work."); 2991 } 2992 2993 /* 2994 * When we journal data on quota file, we have to flush journal to see 2995 * all updates to the file when we bypass pagecache... 2996 */ 2997 if (ext3_should_journal_data(d_inode(path->dentry))) { 2998 /* 2999 * We don't need to lock updates but journal_flush() could 3000 * otherwise be livelocked... 3001 */ 3002 journal_lock_updates(EXT3_SB(sb)->s_journal); 3003 err = journal_flush(EXT3_SB(sb)->s_journal); 3004 journal_unlock_updates(EXT3_SB(sb)->s_journal); 3005 if (err) 3006 return err; 3007 } 3008 3009 return dquot_quota_on(sb, type, format_id, path); 3010} 3011 3012/* Read data from quotafile - avoid pagecache and such because we cannot afford 3013 * acquiring the locks... As quota files are never truncated and quota code 3014 * itself serializes the operations (and no one else should touch the files) 3015 * we don't have to be afraid of races */ 3016static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data, 3017 size_t len, loff_t off) 3018{ 3019 struct inode *inode = sb_dqopt(sb)->files[type]; 3020 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb); 3021 int err = 0; 3022 int offset = off & (sb->s_blocksize - 1); 3023 int tocopy; 3024 size_t toread; 3025 struct buffer_head *bh; 3026 loff_t i_size = i_size_read(inode); 3027 3028 if (off > i_size) 3029 return 0; 3030 if (off+len > i_size) 3031 len = i_size-off; 3032 toread = len; 3033 while (toread > 0) { 3034 tocopy = sb->s_blocksize - offset < toread ? 3035 sb->s_blocksize - offset : toread; 3036 bh = ext3_bread(NULL, inode, blk, 0, &err); 3037 if (err) 3038 return err; 3039 if (!bh) /* A hole? */ 3040 memset(data, 0, tocopy); 3041 else 3042 memcpy(data, bh->b_data+offset, tocopy); 3043 brelse(bh); 3044 offset = 0; 3045 toread -= tocopy; 3046 data += tocopy; 3047 blk++; 3048 } 3049 return len; 3050} 3051 3052/* Write to quotafile (we know the transaction is already started and has 3053 * enough credits) */ 3054static ssize_t ext3_quota_write(struct super_block *sb, int type, 3055 const char *data, size_t len, loff_t off) 3056{ 3057 struct inode *inode = sb_dqopt(sb)->files[type]; 3058 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb); 3059 int err = 0; 3060 int offset = off & (sb->s_blocksize - 1); 3061 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL; 3062 struct buffer_head *bh; 3063 handle_t *handle = journal_current_handle(); 3064 3065 if (!handle) { 3066 ext3_msg(sb, KERN_WARNING, 3067 "warning: quota write (off=%llu, len=%llu)" 3068 " cancelled because transaction is not started.", 3069 (unsigned long long)off, (unsigned long long)len); 3070 return -EIO; 3071 } 3072 3073 /* 3074 * Since we account only one data block in transaction credits, 3075 * then it is impossible to cross a block boundary. 3076 */ 3077 if (sb->s_blocksize - offset < len) { 3078 ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" 3079 " cancelled because not block aligned", 3080 (unsigned long long)off, (unsigned long long)len); 3081 return -EIO; 3082 } 3083 bh = ext3_bread(handle, inode, blk, 1, &err); 3084 if (!bh) 3085 goto out; 3086 if (journal_quota) { 3087 err = ext3_journal_get_write_access(handle, bh); 3088 if (err) { 3089 brelse(bh); 3090 goto out; 3091 } 3092 } 3093 lock_buffer(bh); 3094 memcpy(bh->b_data+offset, data, len); 3095 flush_dcache_page(bh->b_page); 3096 unlock_buffer(bh); 3097 if (journal_quota) 3098 err = ext3_journal_dirty_metadata(handle, bh); 3099 else { 3100 /* Always do at least ordered writes for quotas */ 3101 err = ext3_journal_dirty_data(handle, bh); 3102 mark_buffer_dirty(bh); 3103 } 3104 brelse(bh); 3105out: 3106 if (err) 3107 return err; 3108 if (inode->i_size < off + len) { 3109 i_size_write(inode, off + len); 3110 EXT3_I(inode)->i_disksize = inode->i_size; 3111 } 3112 inode->i_version++; 3113 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 3114 ext3_mark_inode_dirty(handle, inode); 3115 return len; 3116} 3117 3118#endif 3119 3120static struct dentry *ext3_mount(struct file_system_type *fs_type, 3121 int flags, const char *dev_name, void *data) 3122{ 3123 return mount_bdev(fs_type, flags, dev_name, data, ext3_fill_super); 3124} 3125 3126static struct file_system_type ext3_fs_type = { 3127 .owner = THIS_MODULE, 3128 .name = "ext3", 3129 .mount = ext3_mount, 3130 .kill_sb = kill_block_super, 3131 .fs_flags = FS_REQUIRES_DEV, 3132}; 3133MODULE_ALIAS_FS("ext3"); 3134 3135static int __init init_ext3_fs(void) 3136{ 3137 int err = init_ext3_xattr(); 3138 if (err) 3139 return err; 3140 err = init_inodecache(); 3141 if (err) 3142 goto out1; 3143 err = register_filesystem(&ext3_fs_type); 3144 if (err) 3145 goto out; 3146 return 0; 3147out: 3148 destroy_inodecache(); 3149out1: 3150 exit_ext3_xattr(); 3151 return err; 3152} 3153 3154static void __exit exit_ext3_fs(void) 3155{ 3156 unregister_filesystem(&ext3_fs_type); 3157 destroy_inodecache(); 3158 exit_ext3_xattr(); 3159} 3160 3161MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); 3162MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions"); 3163MODULE_LICENSE("GPL"); 3164module_init(init_ext3_fs) 3165module_exit(exit_ext3_fs) 3166