1 /* 2 * linux/fs/ext2/super.c 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/fs/minix/inode.c 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 * 15 * Big-endian to little-endian byte-swapping/bitmaps by 16 * David S. Miller (davem@caip.rutgers.edu), 1995 17 */ 18 19 #include <linux/module.h> 20 #include <linux/string.h> 21 #include <linux/fs.h> 22 #include <linux/slab.h> 23 #include <linux/init.h> 24 #include <linux/blkdev.h> 25 #include <linux/parser.h> 26 #include <linux/random.h> 27 #include <linux/buffer_head.h> 28 #include <linux/exportfs.h> 29 #include <linux/vfs.h> 30 #include <linux/seq_file.h> 31 #include <linux/mount.h> 32 #include <linux/log2.h> 33 #include <linux/quotaops.h> 34 #include <linux/uaccess.h> 35 #include "ext2.h" 36 #include "xattr.h" 37 #include "acl.h" 38 39 static void ext2_write_super(struct super_block *sb); 40 static int ext2_remount (struct super_block * sb, int * flags, char * data); 41 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf); 42 static int ext2_sync_fs(struct super_block *sb, int wait); 43 static int ext2_freeze(struct super_block *sb); 44 static int ext2_unfreeze(struct super_block *sb); 45 46 void ext2_error(struct super_block *sb, const char *function, 47 const char *fmt, ...) 48 { 49 struct va_format vaf; 50 va_list args; 51 struct ext2_sb_info *sbi = EXT2_SB(sb); 52 struct ext2_super_block *es = sbi->s_es; 53 54 if (!(sb->s_flags & MS_RDONLY)) { 55 spin_lock(&sbi->s_lock); 56 sbi->s_mount_state |= EXT2_ERROR_FS; 57 es->s_state |= cpu_to_le16(EXT2_ERROR_FS); 58 spin_unlock(&sbi->s_lock); 59 ext2_sync_super(sb, es, 1); 60 } 61 62 va_start(args, fmt); 63 64 vaf.fmt = fmt; 65 vaf.va = &args; 66 67 printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n", 68 sb->s_id, function, &vaf); 69 70 va_end(args); 71 72 if (test_opt(sb, ERRORS_PANIC)) 73 panic("EXT2-fs: panic from previous error\n"); 74 if (test_opt(sb, ERRORS_RO)) { 75 ext2_msg(sb, KERN_CRIT, 76 "error: remounting filesystem read-only"); 77 sb->s_flags |= MS_RDONLY; 78 } 79 } 80 81 void ext2_msg(struct super_block *sb, const char *prefix, 82 const char *fmt, ...) 83 { 84 struct va_format vaf; 85 va_list args; 86 87 va_start(args, fmt); 88 89 vaf.fmt = fmt; 90 vaf.va = &args; 91 92 printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf); 93 94 va_end(args); 95 } 96 97 /* 98 * This must be called with sbi->s_lock held. 99 */ 100 void ext2_update_dynamic_rev(struct super_block *sb) 101 { 102 struct ext2_super_block *es = EXT2_SB(sb)->s_es; 103 104 if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV) 105 return; 106 107 ext2_msg(sb, KERN_WARNING, 108 "warning: updating to rev %d because of " 109 "new feature flag, running e2fsck is recommended", 110 EXT2_DYNAMIC_REV); 111 112 es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO); 113 es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE); 114 es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV); 115 /* leave es->s_feature_*compat flags alone */ 116 /* es->s_uuid will be set by e2fsck if empty */ 117 118 /* 119 * The rest of the superblock fields should be zero, and if not it 120 * means they are likely already in use, so leave them alone. We 121 * can leave it up to e2fsck to clean up any inconsistencies there. 122 */ 123 } 124 125 #ifdef CONFIG_QUOTA 126 static int ext2_quota_off(struct super_block *sb, int type); 127 128 static void ext2_quota_off_umount(struct super_block *sb) 129 { 130 int type; 131 132 for (type = 0; type < MAXQUOTAS; type++) 133 ext2_quota_off(sb, type); 134 } 135 #else 136 static inline void ext2_quota_off_umount(struct super_block *sb) 137 { 138 } 139 #endif 140 141 static void ext2_put_super (struct super_block * sb) 142 { 143 int db_count; 144 int i; 145 struct ext2_sb_info *sbi = EXT2_SB(sb); 146 147 ext2_quota_off_umount(sb); 148 149 if (sbi->s_mb_cache) { 150 ext2_xattr_destroy_cache(sbi->s_mb_cache); 151 sbi->s_mb_cache = NULL; 152 } 153 if (!(sb->s_flags & MS_RDONLY)) { 154 struct ext2_super_block *es = sbi->s_es; 155 156 spin_lock(&sbi->s_lock); 157 es->s_state = cpu_to_le16(sbi->s_mount_state); 158 spin_unlock(&sbi->s_lock); 159 ext2_sync_super(sb, es, 1); 160 } 161 db_count = sbi->s_gdb_count; 162 for (i = 0; i < db_count; i++) 163 if (sbi->s_group_desc[i]) 164 brelse (sbi->s_group_desc[i]); 165 kfree(sbi->s_group_desc); 166 kfree(sbi->s_debts); 167 percpu_counter_destroy(&sbi->s_freeblocks_counter); 168 percpu_counter_destroy(&sbi->s_freeinodes_counter); 169 percpu_counter_destroy(&sbi->s_dirs_counter); 170 brelse (sbi->s_sbh); 171 sb->s_fs_info = NULL; 172 kfree(sbi->s_blockgroup_lock); 173 kfree(sbi); 174 } 175 176 static struct kmem_cache * ext2_inode_cachep; 177 178 static struct inode *ext2_alloc_inode(struct super_block *sb) 179 { 180 struct ext2_inode_info *ei; 181 ei = kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL); 182 if (!ei) 183 return NULL; 184 ei->i_block_alloc_info = NULL; 185 ei->vfs_inode.i_version = 1; 186 #ifdef CONFIG_QUOTA 187 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot)); 188 #endif 189 190 return &ei->vfs_inode; 191 } 192 193 static void ext2_i_callback(struct rcu_head *head) 194 { 195 struct inode *inode = container_of(head, struct inode, i_rcu); 196 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode)); 197 } 198 199 static void ext2_destroy_inode(struct inode *inode) 200 { 201 call_rcu(&inode->i_rcu, ext2_i_callback); 202 } 203 204 static void init_once(void *foo) 205 { 206 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo; 207 208 rwlock_init(&ei->i_meta_lock); 209 #ifdef CONFIG_EXT2_FS_XATTR 210 init_rwsem(&ei->xattr_sem); 211 #endif 212 mutex_init(&ei->truncate_mutex); 213 #ifdef CONFIG_FS_DAX 214 init_rwsem(&ei->dax_sem); 215 #endif 216 inode_init_once(&ei->vfs_inode); 217 } 218 219 static int __init init_inodecache(void) 220 { 221 ext2_inode_cachep = kmem_cache_create("ext2_inode_cache", 222 sizeof(struct ext2_inode_info), 223 0, (SLAB_RECLAIM_ACCOUNT| 224 SLAB_MEM_SPREAD|SLAB_ACCOUNT), 225 init_once); 226 if (ext2_inode_cachep == NULL) 227 return -ENOMEM; 228 return 0; 229 } 230 231 static void destroy_inodecache(void) 232 { 233 /* 234 * Make sure all delayed rcu free inodes are flushed before we 235 * destroy cache. 236 */ 237 rcu_barrier(); 238 kmem_cache_destroy(ext2_inode_cachep); 239 } 240 241 static int ext2_show_options(struct seq_file *seq, struct dentry *root) 242 { 243 struct super_block *sb = root->d_sb; 244 struct ext2_sb_info *sbi = EXT2_SB(sb); 245 struct ext2_super_block *es = sbi->s_es; 246 unsigned long def_mount_opts; 247 248 spin_lock(&sbi->s_lock); 249 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 250 251 if (sbi->s_sb_block != 1) 252 seq_printf(seq, ",sb=%lu", sbi->s_sb_block); 253 if (test_opt(sb, MINIX_DF)) 254 seq_puts(seq, ",minixdf"); 255 if (test_opt(sb, GRPID)) 256 seq_puts(seq, ",grpid"); 257 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS)) 258 seq_puts(seq, ",nogrpid"); 259 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) || 260 le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) { 261 seq_printf(seq, ",resuid=%u", 262 from_kuid_munged(&init_user_ns, sbi->s_resuid)); 263 } 264 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) || 265 le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) { 266 seq_printf(seq, ",resgid=%u", 267 from_kgid_munged(&init_user_ns, sbi->s_resgid)); 268 } 269 if (test_opt(sb, ERRORS_RO)) { 270 int def_errors = le16_to_cpu(es->s_errors); 271 272 if (def_errors == EXT2_ERRORS_PANIC || 273 def_errors == EXT2_ERRORS_CONTINUE) { 274 seq_puts(seq, ",errors=remount-ro"); 275 } 276 } 277 if (test_opt(sb, ERRORS_CONT)) 278 seq_puts(seq, ",errors=continue"); 279 if (test_opt(sb, ERRORS_PANIC)) 280 seq_puts(seq, ",errors=panic"); 281 if (test_opt(sb, NO_UID32)) 282 seq_puts(seq, ",nouid32"); 283 if (test_opt(sb, DEBUG)) 284 seq_puts(seq, ",debug"); 285 if (test_opt(sb, OLDALLOC)) 286 seq_puts(seq, ",oldalloc"); 287 288 #ifdef CONFIG_EXT2_FS_XATTR 289 if (test_opt(sb, XATTR_USER)) 290 seq_puts(seq, ",user_xattr"); 291 if (!test_opt(sb, XATTR_USER) && 292 (def_mount_opts & EXT2_DEFM_XATTR_USER)) { 293 seq_puts(seq, ",nouser_xattr"); 294 } 295 #endif 296 297 #ifdef CONFIG_EXT2_FS_POSIX_ACL 298 if (test_opt(sb, POSIX_ACL)) 299 seq_puts(seq, ",acl"); 300 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL)) 301 seq_puts(seq, ",noacl"); 302 #endif 303 304 if (test_opt(sb, NOBH)) 305 seq_puts(seq, ",nobh"); 306 307 #if defined(CONFIG_QUOTA) 308 if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA) 309 seq_puts(seq, ",usrquota"); 310 311 if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA) 312 seq_puts(seq, ",grpquota"); 313 #endif 314 315 #ifdef CONFIG_FS_DAX 316 if (sbi->s_mount_opt & EXT2_MOUNT_XIP) 317 seq_puts(seq, ",xip"); 318 if (sbi->s_mount_opt & EXT2_MOUNT_DAX) 319 seq_puts(seq, ",dax"); 320 #endif 321 322 if (!test_opt(sb, RESERVATION)) 323 seq_puts(seq, ",noreservation"); 324 325 spin_unlock(&sbi->s_lock); 326 return 0; 327 } 328 329 #ifdef CONFIG_QUOTA 330 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); 331 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); 332 static int ext2_quota_on(struct super_block *sb, int type, int format_id, 333 const struct path *path); 334 static struct dquot **ext2_get_dquots(struct inode *inode) 335 { 336 return EXT2_I(inode)->i_dquot; 337 } 338 339 static const struct quotactl_ops ext2_quotactl_ops = { 340 .quota_on = ext2_quota_on, 341 .quota_off = ext2_quota_off, 342 .quota_sync = dquot_quota_sync, 343 .get_state = dquot_get_state, 344 .set_info = dquot_set_dqinfo, 345 .get_dqblk = dquot_get_dqblk, 346 .set_dqblk = dquot_set_dqblk, 347 .get_nextdqblk = dquot_get_next_dqblk, 348 }; 349 #endif 350 351 static const struct super_operations ext2_sops = { 352 .alloc_inode = ext2_alloc_inode, 353 .destroy_inode = ext2_destroy_inode, 354 .write_inode = ext2_write_inode, 355 .evict_inode = ext2_evict_inode, 356 .put_super = ext2_put_super, 357 .sync_fs = ext2_sync_fs, 358 .freeze_fs = ext2_freeze, 359 .unfreeze_fs = ext2_unfreeze, 360 .statfs = ext2_statfs, 361 .remount_fs = ext2_remount, 362 .show_options = ext2_show_options, 363 #ifdef CONFIG_QUOTA 364 .quota_read = ext2_quota_read, 365 .quota_write = ext2_quota_write, 366 .get_dquots = ext2_get_dquots, 367 #endif 368 }; 369 370 static struct inode *ext2_nfs_get_inode(struct super_block *sb, 371 u64 ino, u32 generation) 372 { 373 struct inode *inode; 374 375 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) 376 return ERR_PTR(-ESTALE); 377 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) 378 return ERR_PTR(-ESTALE); 379 380 /* 381 * ext2_iget isn't quite right if the inode is currently unallocated! 382 * However ext2_iget currently does appropriate checks to handle stale 383 * inodes so everything is OK. 384 */ 385 inode = ext2_iget(sb, ino); 386 if (IS_ERR(inode)) 387 return ERR_CAST(inode); 388 if (generation && inode->i_generation != generation) { 389 /* we didn't find the right inode.. */ 390 iput(inode); 391 return ERR_PTR(-ESTALE); 392 } 393 return inode; 394 } 395 396 static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid, 397 int fh_len, int fh_type) 398 { 399 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 400 ext2_nfs_get_inode); 401 } 402 403 static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid, 404 int fh_len, int fh_type) 405 { 406 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 407 ext2_nfs_get_inode); 408 } 409 410 static const struct export_operations ext2_export_ops = { 411 .fh_to_dentry = ext2_fh_to_dentry, 412 .fh_to_parent = ext2_fh_to_parent, 413 .get_parent = ext2_get_parent, 414 }; 415 416 static unsigned long get_sb_block(void **data) 417 { 418 unsigned long sb_block; 419 char *options = (char *) *data; 420 421 if (!options || strncmp(options, "sb=", 3) != 0) 422 return 1; /* Default location */ 423 options += 3; 424 sb_block = simple_strtoul(options, &options, 0); 425 if (*options && *options != ',') { 426 printk("EXT2-fs: Invalid sb specification: %s\n", 427 (char *) *data); 428 return 1; 429 } 430 if (*options == ',') 431 options++; 432 *data = (void *) options; 433 return sb_block; 434 } 435 436 enum { 437 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 438 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, 439 Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug, 440 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, 441 Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota, 442 Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation 443 }; 444 445 static const match_table_t tokens = { 446 {Opt_bsd_df, "bsddf"}, 447 {Opt_minix_df, "minixdf"}, 448 {Opt_grpid, "grpid"}, 449 {Opt_grpid, "bsdgroups"}, 450 {Opt_nogrpid, "nogrpid"}, 451 {Opt_nogrpid, "sysvgroups"}, 452 {Opt_resgid, "resgid=%u"}, 453 {Opt_resuid, "resuid=%u"}, 454 {Opt_sb, "sb=%u"}, 455 {Opt_err_cont, "errors=continue"}, 456 {Opt_err_panic, "errors=panic"}, 457 {Opt_err_ro, "errors=remount-ro"}, 458 {Opt_nouid32, "nouid32"}, 459 {Opt_nocheck, "check=none"}, 460 {Opt_nocheck, "nocheck"}, 461 {Opt_debug, "debug"}, 462 {Opt_oldalloc, "oldalloc"}, 463 {Opt_orlov, "orlov"}, 464 {Opt_nobh, "nobh"}, 465 {Opt_user_xattr, "user_xattr"}, 466 {Opt_nouser_xattr, "nouser_xattr"}, 467 {Opt_acl, "acl"}, 468 {Opt_noacl, "noacl"}, 469 {Opt_xip, "xip"}, 470 {Opt_dax, "dax"}, 471 {Opt_grpquota, "grpquota"}, 472 {Opt_ignore, "noquota"}, 473 {Opt_quota, "quota"}, 474 {Opt_usrquota, "usrquota"}, 475 {Opt_reservation, "reservation"}, 476 {Opt_noreservation, "noreservation"}, 477 {Opt_err, NULL} 478 }; 479 480 static int parse_options(char *options, struct super_block *sb) 481 { 482 char *p; 483 struct ext2_sb_info *sbi = EXT2_SB(sb); 484 substring_t args[MAX_OPT_ARGS]; 485 int option; 486 kuid_t uid; 487 kgid_t gid; 488 489 if (!options) 490 return 1; 491 492 while ((p = strsep (&options, ",")) != NULL) { 493 int token; 494 if (!*p) 495 continue; 496 497 token = match_token(p, tokens, args); 498 switch (token) { 499 case Opt_bsd_df: 500 clear_opt (sbi->s_mount_opt, MINIX_DF); 501 break; 502 case Opt_minix_df: 503 set_opt (sbi->s_mount_opt, MINIX_DF); 504 break; 505 case Opt_grpid: 506 set_opt (sbi->s_mount_opt, GRPID); 507 break; 508 case Opt_nogrpid: 509 clear_opt (sbi->s_mount_opt, GRPID); 510 break; 511 case Opt_resuid: 512 if (match_int(&args[0], &option)) 513 return 0; 514 uid = make_kuid(current_user_ns(), option); 515 if (!uid_valid(uid)) { 516 ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option); 517 return 0; 518 519 } 520 sbi->s_resuid = uid; 521 break; 522 case Opt_resgid: 523 if (match_int(&args[0], &option)) 524 return 0; 525 gid = make_kgid(current_user_ns(), option); 526 if (!gid_valid(gid)) { 527 ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option); 528 return 0; 529 } 530 sbi->s_resgid = gid; 531 break; 532 case Opt_sb: 533 /* handled by get_sb_block() instead of here */ 534 /* *sb_block = match_int(&args[0]); */ 535 break; 536 case Opt_err_panic: 537 clear_opt (sbi->s_mount_opt, ERRORS_CONT); 538 clear_opt (sbi->s_mount_opt, ERRORS_RO); 539 set_opt (sbi->s_mount_opt, ERRORS_PANIC); 540 break; 541 case Opt_err_ro: 542 clear_opt (sbi->s_mount_opt, ERRORS_CONT); 543 clear_opt (sbi->s_mount_opt, ERRORS_PANIC); 544 set_opt (sbi->s_mount_opt, ERRORS_RO); 545 break; 546 case Opt_err_cont: 547 clear_opt (sbi->s_mount_opt, ERRORS_RO); 548 clear_opt (sbi->s_mount_opt, ERRORS_PANIC); 549 set_opt (sbi->s_mount_opt, ERRORS_CONT); 550 break; 551 case Opt_nouid32: 552 set_opt (sbi->s_mount_opt, NO_UID32); 553 break; 554 case Opt_nocheck: 555 clear_opt (sbi->s_mount_opt, CHECK); 556 break; 557 case Opt_debug: 558 set_opt (sbi->s_mount_opt, DEBUG); 559 break; 560 case Opt_oldalloc: 561 set_opt (sbi->s_mount_opt, OLDALLOC); 562 break; 563 case Opt_orlov: 564 clear_opt (sbi->s_mount_opt, OLDALLOC); 565 break; 566 case Opt_nobh: 567 set_opt (sbi->s_mount_opt, NOBH); 568 break; 569 #ifdef CONFIG_EXT2_FS_XATTR 570 case Opt_user_xattr: 571 set_opt (sbi->s_mount_opt, XATTR_USER); 572 break; 573 case Opt_nouser_xattr: 574 clear_opt (sbi->s_mount_opt, XATTR_USER); 575 break; 576 #else 577 case Opt_user_xattr: 578 case Opt_nouser_xattr: 579 ext2_msg(sb, KERN_INFO, "(no)user_xattr options" 580 "not supported"); 581 break; 582 #endif 583 #ifdef CONFIG_EXT2_FS_POSIX_ACL 584 case Opt_acl: 585 set_opt(sbi->s_mount_opt, POSIX_ACL); 586 break; 587 case Opt_noacl: 588 clear_opt(sbi->s_mount_opt, POSIX_ACL); 589 break; 590 #else 591 case Opt_acl: 592 case Opt_noacl: 593 ext2_msg(sb, KERN_INFO, 594 "(no)acl options not supported"); 595 break; 596 #endif 597 case Opt_xip: 598 ext2_msg(sb, KERN_INFO, "use dax instead of xip"); 599 set_opt(sbi->s_mount_opt, XIP); 600 /* Fall through */ 601 case Opt_dax: 602 #ifdef CONFIG_FS_DAX 603 ext2_msg(sb, KERN_WARNING, 604 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); 605 set_opt(sbi->s_mount_opt, DAX); 606 #else 607 ext2_msg(sb, KERN_INFO, "dax option not supported"); 608 #endif 609 break; 610 611 #if defined(CONFIG_QUOTA) 612 case Opt_quota: 613 case Opt_usrquota: 614 set_opt(sbi->s_mount_opt, USRQUOTA); 615 break; 616 617 case Opt_grpquota: 618 set_opt(sbi->s_mount_opt, GRPQUOTA); 619 break; 620 #else 621 case Opt_quota: 622 case Opt_usrquota: 623 case Opt_grpquota: 624 ext2_msg(sb, KERN_INFO, 625 "quota operations not supported"); 626 break; 627 #endif 628 629 case Opt_reservation: 630 set_opt(sbi->s_mount_opt, RESERVATION); 631 ext2_msg(sb, KERN_INFO, "reservations ON"); 632 break; 633 case Opt_noreservation: 634 clear_opt(sbi->s_mount_opt, RESERVATION); 635 ext2_msg(sb, KERN_INFO, "reservations OFF"); 636 break; 637 case Opt_ignore: 638 break; 639 default: 640 return 0; 641 } 642 } 643 return 1; 644 } 645 646 static int ext2_setup_super (struct super_block * sb, 647 struct ext2_super_block * es, 648 int read_only) 649 { 650 int res = 0; 651 struct ext2_sb_info *sbi = EXT2_SB(sb); 652 653 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { 654 ext2_msg(sb, KERN_ERR, 655 "error: revision level too high, " 656 "forcing read-only mode"); 657 res = MS_RDONLY; 658 } 659 if (read_only) 660 return res; 661 if (!(sbi->s_mount_state & EXT2_VALID_FS)) 662 ext2_msg(sb, KERN_WARNING, 663 "warning: mounting unchecked fs, " 664 "running e2fsck is recommended"); 665 else if ((sbi->s_mount_state & EXT2_ERROR_FS)) 666 ext2_msg(sb, KERN_WARNING, 667 "warning: mounting fs with errors, " 668 "running e2fsck is recommended"); 669 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 670 le16_to_cpu(es->s_mnt_count) >= 671 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 672 ext2_msg(sb, KERN_WARNING, 673 "warning: maximal mount count reached, " 674 "running e2fsck is recommended"); 675 else if (le32_to_cpu(es->s_checkinterval) && 676 (le32_to_cpu(es->s_lastcheck) + 677 le32_to_cpu(es->s_checkinterval) <= get_seconds())) 678 ext2_msg(sb, KERN_WARNING, 679 "warning: checktime reached, " 680 "running e2fsck is recommended"); 681 if (!le16_to_cpu(es->s_max_mnt_count)) 682 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); 683 le16_add_cpu(&es->s_mnt_count, 1); 684 if (test_opt (sb, DEBUG)) 685 ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, " 686 "bpg=%lu, ipg=%lu, mo=%04lx]", 687 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, 688 sbi->s_frag_size, 689 sbi->s_groups_count, 690 EXT2_BLOCKS_PER_GROUP(sb), 691 EXT2_INODES_PER_GROUP(sb), 692 sbi->s_mount_opt); 693 return res; 694 } 695 696 static int ext2_check_descriptors(struct super_block *sb) 697 { 698 int i; 699 struct ext2_sb_info *sbi = EXT2_SB(sb); 700 701 ext2_debug ("Checking group descriptors"); 702 703 for (i = 0; i < sbi->s_groups_count; i++) { 704 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL); 705 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i); 706 ext2_fsblk_t last_block; 707 708 if (i == sbi->s_groups_count - 1) 709 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; 710 else 711 last_block = first_block + 712 (EXT2_BLOCKS_PER_GROUP(sb) - 1); 713 714 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || 715 le32_to_cpu(gdp->bg_block_bitmap) > last_block) 716 { 717 ext2_error (sb, "ext2_check_descriptors", 718 "Block bitmap for group %d" 719 " not in group (block %lu)!", 720 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); 721 return 0; 722 } 723 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || 724 le32_to_cpu(gdp->bg_inode_bitmap) > last_block) 725 { 726 ext2_error (sb, "ext2_check_descriptors", 727 "Inode bitmap for group %d" 728 " not in group (block %lu)!", 729 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); 730 return 0; 731 } 732 if (le32_to_cpu(gdp->bg_inode_table) < first_block || 733 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > 734 last_block) 735 { 736 ext2_error (sb, "ext2_check_descriptors", 737 "Inode table for group %d" 738 " not in group (block %lu)!", 739 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); 740 return 0; 741 } 742 } 743 return 1; 744 } 745 746 /* 747 * Maximal file size. There is a direct, and {,double-,triple-}indirect 748 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. 749 * We need to be 1 filesystem block less than the 2^32 sector limit. 750 */ 751 static loff_t ext2_max_size(int bits) 752 { 753 loff_t res = EXT2_NDIR_BLOCKS; 754 int meta_blocks; 755 loff_t upper_limit; 756 757 /* This is calculated to be the largest file size for a 758 * dense, file such that the total number of 759 * sectors in the file, including data and all indirect blocks, 760 * does not exceed 2^32 -1 761 * __u32 i_blocks representing the total number of 762 * 512 bytes blocks of the file 763 */ 764 upper_limit = (1LL << 32) - 1; 765 766 /* total blocks in file system block size */ 767 upper_limit >>= (bits - 9); 768 769 770 /* indirect blocks */ 771 meta_blocks = 1; 772 /* double indirect blocks */ 773 meta_blocks += 1 + (1LL << (bits-2)); 774 /* tripple indirect blocks */ 775 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); 776 777 upper_limit -= meta_blocks; 778 upper_limit <<= bits; 779 780 res += 1LL << (bits-2); 781 res += 1LL << (2*(bits-2)); 782 res += 1LL << (3*(bits-2)); 783 res <<= bits; 784 if (res > upper_limit) 785 res = upper_limit; 786 787 if (res > MAX_LFS_FILESIZE) 788 res = MAX_LFS_FILESIZE; 789 790 return res; 791 } 792 793 static unsigned long descriptor_loc(struct super_block *sb, 794 unsigned long logic_sb_block, 795 int nr) 796 { 797 struct ext2_sb_info *sbi = EXT2_SB(sb); 798 unsigned long bg, first_meta_bg; 799 int has_super = 0; 800 801 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 802 803 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || 804 nr < first_meta_bg) 805 return (logic_sb_block + nr + 1); 806 bg = sbi->s_desc_per_block * nr; 807 if (ext2_bg_has_super(sb, bg)) 808 has_super = 1; 809 810 return ext2_group_first_block_no(sb, bg) + has_super; 811 } 812 813 static int ext2_fill_super(struct super_block *sb, void *data, int silent) 814 { 815 struct buffer_head * bh; 816 struct ext2_sb_info * sbi; 817 struct ext2_super_block * es; 818 struct inode *root; 819 unsigned long block; 820 unsigned long sb_block = get_sb_block(&data); 821 unsigned long logic_sb_block; 822 unsigned long offset = 0; 823 unsigned long def_mount_opts; 824 long ret = -EINVAL; 825 int blocksize = BLOCK_SIZE; 826 int db_count; 827 int i, j; 828 __le32 features; 829 int err; 830 831 err = -ENOMEM; 832 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 833 if (!sbi) 834 goto failed; 835 836 sbi->s_blockgroup_lock = 837 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); 838 if (!sbi->s_blockgroup_lock) { 839 kfree(sbi); 840 goto failed; 841 } 842 sb->s_fs_info = sbi; 843 sbi->s_sb_block = sb_block; 844 845 spin_lock_init(&sbi->s_lock); 846 847 /* 848 * See what the current blocksize for the device is, and 849 * use that as the blocksize. Otherwise (or if the blocksize 850 * is smaller than the default) use the default. 851 * This is important for devices that have a hardware 852 * sectorsize that is larger than the default. 853 */ 854 blocksize = sb_min_blocksize(sb, BLOCK_SIZE); 855 if (!blocksize) { 856 ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); 857 goto failed_sbi; 858 } 859 860 /* 861 * If the superblock doesn't start on a hardware sector boundary, 862 * calculate the offset. 863 */ 864 if (blocksize != BLOCK_SIZE) { 865 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 866 offset = (sb_block*BLOCK_SIZE) % blocksize; 867 } else { 868 logic_sb_block = sb_block; 869 } 870 871 if (!(bh = sb_bread(sb, logic_sb_block))) { 872 ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); 873 goto failed_sbi; 874 } 875 /* 876 * Note: s_es must be initialized as soon as possible because 877 * some ext2 macro-instructions depend on its value 878 */ 879 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 880 sbi->s_es = es; 881 sb->s_magic = le16_to_cpu(es->s_magic); 882 883 if (sb->s_magic != EXT2_SUPER_MAGIC) 884 goto cantfind_ext2; 885 886 /* Set defaults before we parse the mount options */ 887 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 888 if (def_mount_opts & EXT2_DEFM_DEBUG) 889 set_opt(sbi->s_mount_opt, DEBUG); 890 if (def_mount_opts & EXT2_DEFM_BSDGROUPS) 891 set_opt(sbi->s_mount_opt, GRPID); 892 if (def_mount_opts & EXT2_DEFM_UID16) 893 set_opt(sbi->s_mount_opt, NO_UID32); 894 #ifdef CONFIG_EXT2_FS_XATTR 895 if (def_mount_opts & EXT2_DEFM_XATTR_USER) 896 set_opt(sbi->s_mount_opt, XATTR_USER); 897 #endif 898 #ifdef CONFIG_EXT2_FS_POSIX_ACL 899 if (def_mount_opts & EXT2_DEFM_ACL) 900 set_opt(sbi->s_mount_opt, POSIX_ACL); 901 #endif 902 903 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) 904 set_opt(sbi->s_mount_opt, ERRORS_PANIC); 905 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) 906 set_opt(sbi->s_mount_opt, ERRORS_CONT); 907 else 908 set_opt(sbi->s_mount_opt, ERRORS_RO); 909 910 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); 911 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); 912 913 set_opt(sbi->s_mount_opt, RESERVATION); 914 915 if (!parse_options((char *) data, sb)) 916 goto failed_mount; 917 918 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 919 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? 920 MS_POSIXACL : 0); 921 sb->s_iflags |= SB_I_CGROUPWB; 922 923 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && 924 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || 925 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 926 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) 927 ext2_msg(sb, KERN_WARNING, 928 "warning: feature flags set on rev 0 fs, " 929 "running e2fsck is recommended"); 930 /* 931 * Check feature flags regardless of the revision level, since we 932 * previously didn't change the revision level when setting the flags, 933 * so there is a chance incompat flags are set on a rev 0 filesystem. 934 */ 935 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); 936 if (features) { 937 ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " 938 "unsupported optional features (%x)", 939 le32_to_cpu(features)); 940 goto failed_mount; 941 } 942 if (!(sb->s_flags & MS_RDONLY) && 943 (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ 944 ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " 945 "unsupported optional features (%x)", 946 le32_to_cpu(features)); 947 goto failed_mount; 948 } 949 950 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); 951 952 if (sbi->s_mount_opt & EXT2_MOUNT_DAX) { 953 err = bdev_dax_supported(sb, blocksize); 954 if (err) 955 goto failed_mount; 956 } 957 958 /* If the blocksize doesn't match, re-read the thing.. */ 959 if (sb->s_blocksize != blocksize) { 960 brelse(bh); 961 962 if (!sb_set_blocksize(sb, blocksize)) { 963 ext2_msg(sb, KERN_ERR, 964 "error: bad blocksize %d", blocksize); 965 goto failed_sbi; 966 } 967 968 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 969 offset = (sb_block*BLOCK_SIZE) % blocksize; 970 bh = sb_bread(sb, logic_sb_block); 971 if(!bh) { 972 ext2_msg(sb, KERN_ERR, "error: couldn't read" 973 "superblock on 2nd try"); 974 goto failed_sbi; 975 } 976 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 977 sbi->s_es = es; 978 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { 979 ext2_msg(sb, KERN_ERR, "error: magic mismatch"); 980 goto failed_mount; 981 } 982 } 983 984 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); 985 sb->s_max_links = EXT2_LINK_MAX; 986 987 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { 988 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; 989 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; 990 } else { 991 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 992 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 993 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || 994 !is_power_of_2(sbi->s_inode_size) || 995 (sbi->s_inode_size > blocksize)) { 996 ext2_msg(sb, KERN_ERR, 997 "error: unsupported inode size: %d", 998 sbi->s_inode_size); 999 goto failed_mount; 1000 } 1001 } 1002 1003 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << 1004 le32_to_cpu(es->s_log_frag_size); 1005 if (sbi->s_frag_size == 0) 1006 goto cantfind_ext2; 1007 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; 1008 1009 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 1010 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); 1011 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 1012 1013 if (EXT2_INODE_SIZE(sb) == 0) 1014 goto cantfind_ext2; 1015 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); 1016 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) 1017 goto cantfind_ext2; 1018 sbi->s_itb_per_group = sbi->s_inodes_per_group / 1019 sbi->s_inodes_per_block; 1020 sbi->s_desc_per_block = sb->s_blocksize / 1021 sizeof (struct ext2_group_desc); 1022 sbi->s_sbh = bh; 1023 sbi->s_mount_state = le16_to_cpu(es->s_state); 1024 sbi->s_addr_per_block_bits = 1025 ilog2 (EXT2_ADDR_PER_BLOCK(sb)); 1026 sbi->s_desc_per_block_bits = 1027 ilog2 (EXT2_DESC_PER_BLOCK(sb)); 1028 1029 if (sb->s_magic != EXT2_SUPER_MAGIC) 1030 goto cantfind_ext2; 1031 1032 if (sb->s_blocksize != bh->b_size) { 1033 if (!silent) 1034 ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); 1035 goto failed_mount; 1036 } 1037 1038 if (sb->s_blocksize != sbi->s_frag_size) { 1039 ext2_msg(sb, KERN_ERR, 1040 "error: fragsize %lu != blocksize %lu" 1041 "(not supported yet)", 1042 sbi->s_frag_size, sb->s_blocksize); 1043 goto failed_mount; 1044 } 1045 1046 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { 1047 ext2_msg(sb, KERN_ERR, 1048 "error: #blocks per group too big: %lu", 1049 sbi->s_blocks_per_group); 1050 goto failed_mount; 1051 } 1052 if (sbi->s_frags_per_group > sb->s_blocksize * 8) { 1053 ext2_msg(sb, KERN_ERR, 1054 "error: #fragments per group too big: %lu", 1055 sbi->s_frags_per_group); 1056 goto failed_mount; 1057 } 1058 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { 1059 ext2_msg(sb, KERN_ERR, 1060 "error: #inodes per group too big: %lu", 1061 sbi->s_inodes_per_group); 1062 goto failed_mount; 1063 } 1064 1065 if (EXT2_BLOCKS_PER_GROUP(sb) == 0) 1066 goto cantfind_ext2; 1067 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - 1068 le32_to_cpu(es->s_first_data_block) - 1) 1069 / EXT2_BLOCKS_PER_GROUP(sb)) + 1; 1070 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / 1071 EXT2_DESC_PER_BLOCK(sb); 1072 sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL); 1073 if (sbi->s_group_desc == NULL) { 1074 ext2_msg(sb, KERN_ERR, "error: not enough memory"); 1075 goto failed_mount; 1076 } 1077 bgl_lock_init(sbi->s_blockgroup_lock); 1078 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); 1079 if (!sbi->s_debts) { 1080 ext2_msg(sb, KERN_ERR, "error: not enough memory"); 1081 goto failed_mount_group_desc; 1082 } 1083 for (i = 0; i < db_count; i++) { 1084 block = descriptor_loc(sb, logic_sb_block, i); 1085 sbi->s_group_desc[i] = sb_bread(sb, block); 1086 if (!sbi->s_group_desc[i]) { 1087 for (j = 0; j < i; j++) 1088 brelse (sbi->s_group_desc[j]); 1089 ext2_msg(sb, KERN_ERR, 1090 "error: unable to read group descriptors"); 1091 goto failed_mount_group_desc; 1092 } 1093 } 1094 if (!ext2_check_descriptors (sb)) { 1095 ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); 1096 goto failed_mount2; 1097 } 1098 sbi->s_gdb_count = db_count; 1099 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 1100 spin_lock_init(&sbi->s_next_gen_lock); 1101 1102 /* per fileystem reservation list head & lock */ 1103 spin_lock_init(&sbi->s_rsv_window_lock); 1104 sbi->s_rsv_window_root = RB_ROOT; 1105 /* 1106 * Add a single, static dummy reservation to the start of the 1107 * reservation window list --- it gives us a placeholder for 1108 * append-at-start-of-list which makes the allocation logic 1109 * _much_ simpler. 1110 */ 1111 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; 1112 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; 1113 sbi->s_rsv_window_head.rsv_alloc_hit = 0; 1114 sbi->s_rsv_window_head.rsv_goal_size = 0; 1115 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); 1116 1117 err = percpu_counter_init(&sbi->s_freeblocks_counter, 1118 ext2_count_free_blocks(sb), GFP_KERNEL); 1119 if (!err) { 1120 err = percpu_counter_init(&sbi->s_freeinodes_counter, 1121 ext2_count_free_inodes(sb), GFP_KERNEL); 1122 } 1123 if (!err) { 1124 err = percpu_counter_init(&sbi->s_dirs_counter, 1125 ext2_count_dirs(sb), GFP_KERNEL); 1126 } 1127 if (err) { 1128 ext2_msg(sb, KERN_ERR, "error: insufficient memory"); 1129 goto failed_mount3; 1130 } 1131 1132 #ifdef CONFIG_EXT2_FS_XATTR 1133 sbi->s_mb_cache = ext2_xattr_create_cache(); 1134 if (!sbi->s_mb_cache) { 1135 ext2_msg(sb, KERN_ERR, "Failed to create an mb_cache"); 1136 goto failed_mount3; 1137 } 1138 #endif 1139 /* 1140 * set up enough so that it can read an inode 1141 */ 1142 sb->s_op = &ext2_sops; 1143 sb->s_export_op = &ext2_export_ops; 1144 sb->s_xattr = ext2_xattr_handlers; 1145 1146 #ifdef CONFIG_QUOTA 1147 sb->dq_op = &dquot_operations; 1148 sb->s_qcop = &ext2_quotactl_ops; 1149 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1150 #endif 1151 1152 root = ext2_iget(sb, EXT2_ROOT_INO); 1153 if (IS_ERR(root)) { 1154 ret = PTR_ERR(root); 1155 goto failed_mount3; 1156 } 1157 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 1158 iput(root); 1159 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); 1160 goto failed_mount3; 1161 } 1162 1163 sb->s_root = d_make_root(root); 1164 if (!sb->s_root) { 1165 ext2_msg(sb, KERN_ERR, "error: get root inode failed"); 1166 ret = -ENOMEM; 1167 goto failed_mount3; 1168 } 1169 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 1170 ext2_msg(sb, KERN_WARNING, 1171 "warning: mounting ext3 filesystem as ext2"); 1172 if (ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY)) 1173 sb->s_flags |= MS_RDONLY; 1174 ext2_write_super(sb); 1175 return 0; 1176 1177 cantfind_ext2: 1178 if (!silent) 1179 ext2_msg(sb, KERN_ERR, 1180 "error: can't find an ext2 filesystem on dev %s.", 1181 sb->s_id); 1182 goto failed_mount; 1183 failed_mount3: 1184 if (sbi->s_mb_cache) 1185 ext2_xattr_destroy_cache(sbi->s_mb_cache); 1186 percpu_counter_destroy(&sbi->s_freeblocks_counter); 1187 percpu_counter_destroy(&sbi->s_freeinodes_counter); 1188 percpu_counter_destroy(&sbi->s_dirs_counter); 1189 failed_mount2: 1190 for (i = 0; i < db_count; i++) 1191 brelse(sbi->s_group_desc[i]); 1192 failed_mount_group_desc: 1193 kfree(sbi->s_group_desc); 1194 kfree(sbi->s_debts); 1195 failed_mount: 1196 brelse(bh); 1197 failed_sbi: 1198 sb->s_fs_info = NULL; 1199 kfree(sbi->s_blockgroup_lock); 1200 kfree(sbi); 1201 failed: 1202 return ret; 1203 } 1204 1205 static void ext2_clear_super_error(struct super_block *sb) 1206 { 1207 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; 1208 1209 if (buffer_write_io_error(sbh)) { 1210 /* 1211 * Oh, dear. A previous attempt to write the 1212 * superblock failed. This could happen because the 1213 * USB device was yanked out. Or it could happen to 1214 * be a transient write error and maybe the block will 1215 * be remapped. Nothing we can do but to retry the 1216 * write and hope for the best. 1217 */ 1218 ext2_msg(sb, KERN_ERR, 1219 "previous I/O error to superblock detected\n"); 1220 clear_buffer_write_io_error(sbh); 1221 set_buffer_uptodate(sbh); 1222 } 1223 } 1224 1225 void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, 1226 int wait) 1227 { 1228 ext2_clear_super_error(sb); 1229 spin_lock(&EXT2_SB(sb)->s_lock); 1230 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); 1231 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); 1232 es->s_wtime = cpu_to_le32(get_seconds()); 1233 /* unlock before we do IO */ 1234 spin_unlock(&EXT2_SB(sb)->s_lock); 1235 mark_buffer_dirty(EXT2_SB(sb)->s_sbh); 1236 if (wait) 1237 sync_dirty_buffer(EXT2_SB(sb)->s_sbh); 1238 } 1239 1240 /* 1241 * In the second extended file system, it is not necessary to 1242 * write the super block since we use a mapping of the 1243 * disk super block in a buffer. 1244 * 1245 * However, this function is still used to set the fs valid 1246 * flags to 0. We need to set this flag to 0 since the fs 1247 * may have been checked while mounted and e2fsck may have 1248 * set s_state to EXT2_VALID_FS after some corrections. 1249 */ 1250 static int ext2_sync_fs(struct super_block *sb, int wait) 1251 { 1252 struct ext2_sb_info *sbi = EXT2_SB(sb); 1253 struct ext2_super_block *es = EXT2_SB(sb)->s_es; 1254 1255 /* 1256 * Write quota structures to quota file, sync_blockdev() will write 1257 * them to disk later 1258 */ 1259 dquot_writeback_dquots(sb, -1); 1260 1261 spin_lock(&sbi->s_lock); 1262 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { 1263 ext2_debug("setting valid to 0\n"); 1264 es->s_state &= cpu_to_le16(~EXT2_VALID_FS); 1265 } 1266 spin_unlock(&sbi->s_lock); 1267 ext2_sync_super(sb, es, wait); 1268 return 0; 1269 } 1270 1271 static int ext2_freeze(struct super_block *sb) 1272 { 1273 struct ext2_sb_info *sbi = EXT2_SB(sb); 1274 1275 /* 1276 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared 1277 * because we have unattached inodes and thus filesystem is not fully 1278 * consistent. 1279 */ 1280 if (atomic_long_read(&sb->s_remove_count)) { 1281 ext2_sync_fs(sb, 1); 1282 return 0; 1283 } 1284 /* Set EXT2_FS_VALID flag */ 1285 spin_lock(&sbi->s_lock); 1286 sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state); 1287 spin_unlock(&sbi->s_lock); 1288 ext2_sync_super(sb, sbi->s_es, 1); 1289 1290 return 0; 1291 } 1292 1293 static int ext2_unfreeze(struct super_block *sb) 1294 { 1295 /* Just write sb to clear EXT2_VALID_FS flag */ 1296 ext2_write_super(sb); 1297 1298 return 0; 1299 } 1300 1301 static void ext2_write_super(struct super_block *sb) 1302 { 1303 if (!(sb->s_flags & MS_RDONLY)) 1304 ext2_sync_fs(sb, 1); 1305 } 1306 1307 static int ext2_remount (struct super_block * sb, int * flags, char * data) 1308 { 1309 struct ext2_sb_info * sbi = EXT2_SB(sb); 1310 struct ext2_super_block * es; 1311 struct ext2_mount_options old_opts; 1312 unsigned long old_sb_flags; 1313 int err; 1314 1315 sync_filesystem(sb); 1316 spin_lock(&sbi->s_lock); 1317 1318 /* Store the old options */ 1319 old_sb_flags = sb->s_flags; 1320 old_opts.s_mount_opt = sbi->s_mount_opt; 1321 old_opts.s_resuid = sbi->s_resuid; 1322 old_opts.s_resgid = sbi->s_resgid; 1323 1324 /* 1325 * Allow the "check" option to be passed as a remount option. 1326 */ 1327 if (!parse_options(data, sb)) { 1328 err = -EINVAL; 1329 goto restore_opts; 1330 } 1331 1332 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 1333 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 1334 1335 es = sbi->s_es; 1336 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT2_MOUNT_DAX) { 1337 ext2_msg(sb, KERN_WARNING, "warning: refusing change of " 1338 "dax flag with busy inodes while remounting"); 1339 sbi->s_mount_opt ^= EXT2_MOUNT_DAX; 1340 } 1341 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) { 1342 spin_unlock(&sbi->s_lock); 1343 return 0; 1344 } 1345 if (*flags & MS_RDONLY) { 1346 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || 1347 !(sbi->s_mount_state & EXT2_VALID_FS)) { 1348 spin_unlock(&sbi->s_lock); 1349 return 0; 1350 } 1351 1352 /* 1353 * OK, we are remounting a valid rw partition rdonly, so set 1354 * the rdonly flag and then mark the partition as valid again. 1355 */ 1356 es->s_state = cpu_to_le16(sbi->s_mount_state); 1357 es->s_mtime = cpu_to_le32(get_seconds()); 1358 spin_unlock(&sbi->s_lock); 1359 1360 err = dquot_suspend(sb, -1); 1361 if (err < 0) { 1362 spin_lock(&sbi->s_lock); 1363 goto restore_opts; 1364 } 1365 1366 ext2_sync_super(sb, es, 1); 1367 } else { 1368 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, 1369 ~EXT2_FEATURE_RO_COMPAT_SUPP); 1370 if (ret) { 1371 ext2_msg(sb, KERN_WARNING, 1372 "warning: couldn't remount RDWR because of " 1373 "unsupported optional features (%x).", 1374 le32_to_cpu(ret)); 1375 err = -EROFS; 1376 goto restore_opts; 1377 } 1378 /* 1379 * Mounting a RDONLY partition read-write, so reread and 1380 * store the current valid flag. (It may have been changed 1381 * by e2fsck since we originally mounted the partition.) 1382 */ 1383 sbi->s_mount_state = le16_to_cpu(es->s_state); 1384 if (!ext2_setup_super (sb, es, 0)) 1385 sb->s_flags &= ~MS_RDONLY; 1386 spin_unlock(&sbi->s_lock); 1387 1388 ext2_write_super(sb); 1389 1390 dquot_resume(sb, -1); 1391 } 1392 1393 return 0; 1394 restore_opts: 1395 sbi->s_mount_opt = old_opts.s_mount_opt; 1396 sbi->s_resuid = old_opts.s_resuid; 1397 sbi->s_resgid = old_opts.s_resgid; 1398 sb->s_flags = old_sb_flags; 1399 spin_unlock(&sbi->s_lock); 1400 return err; 1401 } 1402 1403 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) 1404 { 1405 struct super_block *sb = dentry->d_sb; 1406 struct ext2_sb_info *sbi = EXT2_SB(sb); 1407 struct ext2_super_block *es = sbi->s_es; 1408 u64 fsid; 1409 1410 spin_lock(&sbi->s_lock); 1411 1412 if (test_opt (sb, MINIX_DF)) 1413 sbi->s_overhead_last = 0; 1414 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { 1415 unsigned long i, overhead = 0; 1416 smp_rmb(); 1417 1418 /* 1419 * Compute the overhead (FS structures). This is constant 1420 * for a given filesystem unless the number of block groups 1421 * changes so we cache the previous value until it does. 1422 */ 1423 1424 /* 1425 * All of the blocks before first_data_block are 1426 * overhead 1427 */ 1428 overhead = le32_to_cpu(es->s_first_data_block); 1429 1430 /* 1431 * Add the overhead attributed to the superblock and 1432 * block group descriptors. If the sparse superblocks 1433 * feature is turned on, then not all groups have this. 1434 */ 1435 for (i = 0; i < sbi->s_groups_count; i++) 1436 overhead += ext2_bg_has_super(sb, i) + 1437 ext2_bg_num_gdb(sb, i); 1438 1439 /* 1440 * Every block group has an inode bitmap, a block 1441 * bitmap, and an inode table. 1442 */ 1443 overhead += (sbi->s_groups_count * 1444 (2 + sbi->s_itb_per_group)); 1445 sbi->s_overhead_last = overhead; 1446 smp_wmb(); 1447 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); 1448 } 1449 1450 buf->f_type = EXT2_SUPER_MAGIC; 1451 buf->f_bsize = sb->s_blocksize; 1452 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; 1453 buf->f_bfree = ext2_count_free_blocks(sb); 1454 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); 1455 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); 1456 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) 1457 buf->f_bavail = 0; 1458 buf->f_files = le32_to_cpu(es->s_inodes_count); 1459 buf->f_ffree = ext2_count_free_inodes(sb); 1460 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); 1461 buf->f_namelen = EXT2_NAME_LEN; 1462 fsid = le64_to_cpup((void *)es->s_uuid) ^ 1463 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 1464 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 1465 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 1466 spin_unlock(&sbi->s_lock); 1467 return 0; 1468 } 1469 1470 static struct dentry *ext2_mount(struct file_system_type *fs_type, 1471 int flags, const char *dev_name, void *data) 1472 { 1473 return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super); 1474 } 1475 1476 #ifdef CONFIG_QUOTA 1477 1478 /* Read data from quotafile - avoid pagecache and such because we cannot afford 1479 * acquiring the locks... As quota files are never truncated and quota code 1480 * itself serializes the operations (and no one else should touch the files) 1481 * we don't have to be afraid of races */ 1482 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, 1483 size_t len, loff_t off) 1484 { 1485 struct inode *inode = sb_dqopt(sb)->files[type]; 1486 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1487 int err = 0; 1488 int offset = off & (sb->s_blocksize - 1); 1489 int tocopy; 1490 size_t toread; 1491 struct buffer_head tmp_bh; 1492 struct buffer_head *bh; 1493 loff_t i_size = i_size_read(inode); 1494 1495 if (off > i_size) 1496 return 0; 1497 if (off+len > i_size) 1498 len = i_size-off; 1499 toread = len; 1500 while (toread > 0) { 1501 tocopy = sb->s_blocksize - offset < toread ? 1502 sb->s_blocksize - offset : toread; 1503 1504 tmp_bh.b_state = 0; 1505 tmp_bh.b_size = sb->s_blocksize; 1506 err = ext2_get_block(inode, blk, &tmp_bh, 0); 1507 if (err < 0) 1508 return err; 1509 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 1510 memset(data, 0, tocopy); 1511 else { 1512 bh = sb_bread(sb, tmp_bh.b_blocknr); 1513 if (!bh) 1514 return -EIO; 1515 memcpy(data, bh->b_data+offset, tocopy); 1516 brelse(bh); 1517 } 1518 offset = 0; 1519 toread -= tocopy; 1520 data += tocopy; 1521 blk++; 1522 } 1523 return len; 1524 } 1525 1526 /* Write to quotafile */ 1527 static ssize_t ext2_quota_write(struct super_block *sb, int type, 1528 const char *data, size_t len, loff_t off) 1529 { 1530 struct inode *inode = sb_dqopt(sb)->files[type]; 1531 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1532 int err = 0; 1533 int offset = off & (sb->s_blocksize - 1); 1534 int tocopy; 1535 size_t towrite = len; 1536 struct buffer_head tmp_bh; 1537 struct buffer_head *bh; 1538 1539 while (towrite > 0) { 1540 tocopy = sb->s_blocksize - offset < towrite ? 1541 sb->s_blocksize - offset : towrite; 1542 1543 tmp_bh.b_state = 0; 1544 tmp_bh.b_size = sb->s_blocksize; 1545 err = ext2_get_block(inode, blk, &tmp_bh, 1); 1546 if (err < 0) 1547 goto out; 1548 if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) 1549 bh = sb_bread(sb, tmp_bh.b_blocknr); 1550 else 1551 bh = sb_getblk(sb, tmp_bh.b_blocknr); 1552 if (unlikely(!bh)) { 1553 err = -EIO; 1554 goto out; 1555 } 1556 lock_buffer(bh); 1557 memcpy(bh->b_data+offset, data, tocopy); 1558 flush_dcache_page(bh->b_page); 1559 set_buffer_uptodate(bh); 1560 mark_buffer_dirty(bh); 1561 unlock_buffer(bh); 1562 brelse(bh); 1563 offset = 0; 1564 towrite -= tocopy; 1565 data += tocopy; 1566 blk++; 1567 } 1568 out: 1569 if (len == towrite) 1570 return err; 1571 if (inode->i_size < off+len-towrite) 1572 i_size_write(inode, off+len-towrite); 1573 inode->i_version++; 1574 inode->i_mtime = inode->i_ctime = current_time(inode); 1575 mark_inode_dirty(inode); 1576 return len - towrite; 1577 } 1578 1579 static int ext2_quota_on(struct super_block *sb, int type, int format_id, 1580 const struct path *path) 1581 { 1582 int err; 1583 struct inode *inode; 1584 1585 err = dquot_quota_on(sb, type, format_id, path); 1586 if (err) 1587 return err; 1588 1589 inode = d_inode(path->dentry); 1590 inode_lock(inode); 1591 EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL; 1592 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, 1593 S_NOATIME | S_IMMUTABLE); 1594 inode_unlock(inode); 1595 mark_inode_dirty(inode); 1596 1597 return 0; 1598 } 1599 1600 static int ext2_quota_off(struct super_block *sb, int type) 1601 { 1602 struct inode *inode = sb_dqopt(sb)->files[type]; 1603 int err; 1604 1605 if (!inode || !igrab(inode)) 1606 goto out; 1607 1608 err = dquot_quota_off(sb, type); 1609 if (err) 1610 goto out_put; 1611 1612 inode_lock(inode); 1613 EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL); 1614 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); 1615 inode_unlock(inode); 1616 mark_inode_dirty(inode); 1617 out_put: 1618 iput(inode); 1619 return err; 1620 out: 1621 return dquot_quota_off(sb, type); 1622 } 1623 1624 #endif 1625 1626 static struct file_system_type ext2_fs_type = { 1627 .owner = THIS_MODULE, 1628 .name = "ext2", 1629 .mount = ext2_mount, 1630 .kill_sb = kill_block_super, 1631 .fs_flags = FS_REQUIRES_DEV, 1632 }; 1633 MODULE_ALIAS_FS("ext2"); 1634 1635 static int __init init_ext2_fs(void) 1636 { 1637 int err; 1638 1639 err = init_inodecache(); 1640 if (err) 1641 return err; 1642 err = register_filesystem(&ext2_fs_type); 1643 if (err) 1644 goto out; 1645 return 0; 1646 out: 1647 destroy_inodecache(); 1648 return err; 1649 } 1650 1651 static void __exit exit_ext2_fs(void) 1652 { 1653 unregister_filesystem(&ext2_fs_type); 1654 destroy_inodecache(); 1655 } 1656 1657 MODULE_AUTHOR("Remy Card and others"); 1658 MODULE_DESCRIPTION("Second Extended Filesystem"); 1659 MODULE_LICENSE("GPL"); 1660 module_init(init_ext2_fs) 1661 module_exit(exit_ext2_fs) 1662