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 <linux/dax.h> 36 #include "ext2.h" 37 #include "xattr.h" 38 #include "acl.h" 39 40 static void ext2_write_super(struct super_block *sb); 41 static int ext2_remount (struct super_block * sb, int * flags, char * data); 42 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf); 43 static int ext2_sync_fs(struct super_block *sb, int wait); 44 static int ext2_freeze(struct super_block *sb); 45 static int ext2_unfreeze(struct super_block *sb); 46 47 void ext2_error(struct super_block *sb, const char *function, 48 const char *fmt, ...) 49 { 50 struct va_format vaf; 51 va_list args; 52 struct ext2_sb_info *sbi = EXT2_SB(sb); 53 struct ext2_super_block *es = sbi->s_es; 54 55 if (!(sb->s_flags & MS_RDONLY)) { 56 spin_lock(&sbi->s_lock); 57 sbi->s_mount_state |= EXT2_ERROR_FS; 58 es->s_state |= cpu_to_le16(EXT2_ERROR_FS); 59 spin_unlock(&sbi->s_lock); 60 ext2_sync_super(sb, es, 1); 61 } 62 63 va_start(args, fmt); 64 65 vaf.fmt = fmt; 66 vaf.va = &args; 67 68 printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n", 69 sb->s_id, function, &vaf); 70 71 va_end(args); 72 73 if (test_opt(sb, ERRORS_PANIC)) 74 panic("EXT2-fs: panic from previous error\n"); 75 if (test_opt(sb, ERRORS_RO)) { 76 ext2_msg(sb, KERN_CRIT, 77 "error: remounting filesystem read-only"); 78 sb->s_flags |= MS_RDONLY; 79 } 80 } 81 82 void ext2_msg(struct super_block *sb, const char *prefix, 83 const char *fmt, ...) 84 { 85 struct va_format vaf; 86 va_list args; 87 88 va_start(args, fmt); 89 90 vaf.fmt = fmt; 91 vaf.va = &args; 92 93 printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf); 94 95 va_end(args); 96 } 97 98 /* 99 * This must be called with sbi->s_lock held. 100 */ 101 void ext2_update_dynamic_rev(struct super_block *sb) 102 { 103 struct ext2_super_block *es = EXT2_SB(sb)->s_es; 104 105 if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV) 106 return; 107 108 ext2_msg(sb, KERN_WARNING, 109 "warning: updating to rev %d because of " 110 "new feature flag, running e2fsck is recommended", 111 EXT2_DYNAMIC_REV); 112 113 es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO); 114 es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE); 115 es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV); 116 /* leave es->s_feature_*compat flags alone */ 117 /* es->s_uuid will be set by e2fsck if empty */ 118 119 /* 120 * The rest of the superblock fields should be zero, and if not it 121 * means they are likely already in use, so leave them alone. We 122 * can leave it up to e2fsck to clean up any inconsistencies there. 123 */ 124 } 125 126 #ifdef CONFIG_QUOTA 127 static int ext2_quota_off(struct super_block *sb, int type); 128 129 static void ext2_quota_off_umount(struct super_block *sb) 130 { 131 int type; 132 133 for (type = 0; type < MAXQUOTAS; type++) 134 ext2_quota_off(sb, type); 135 } 136 #else 137 static inline void ext2_quota_off_umount(struct super_block *sb) 138 { 139 } 140 #endif 141 142 static void ext2_put_super (struct super_block * sb) 143 { 144 int db_count; 145 int i; 146 struct ext2_sb_info *sbi = EXT2_SB(sb); 147 148 ext2_quota_off_umount(sb); 149 150 if (sbi->s_mb_cache) { 151 ext2_xattr_destroy_cache(sbi->s_mb_cache); 152 sbi->s_mb_cache = NULL; 153 } 154 if (!(sb->s_flags & MS_RDONLY)) { 155 struct ext2_super_block *es = sbi->s_es; 156 157 spin_lock(&sbi->s_lock); 158 es->s_state = cpu_to_le16(sbi->s_mount_state); 159 spin_unlock(&sbi->s_lock); 160 ext2_sync_super(sb, es, 1); 161 } 162 db_count = sbi->s_gdb_count; 163 for (i = 0; i < db_count; i++) 164 if (sbi->s_group_desc[i]) 165 brelse (sbi->s_group_desc[i]); 166 kfree(sbi->s_group_desc); 167 kfree(sbi->s_debts); 168 percpu_counter_destroy(&sbi->s_freeblocks_counter); 169 percpu_counter_destroy(&sbi->s_freeinodes_counter); 170 percpu_counter_destroy(&sbi->s_dirs_counter); 171 brelse (sbi->s_sbh); 172 sb->s_fs_info = NULL; 173 kfree(sbi->s_blockgroup_lock); 174 kfree(sbi); 175 } 176 177 static struct kmem_cache * ext2_inode_cachep; 178 179 static struct inode *ext2_alloc_inode(struct super_block *sb) 180 { 181 struct ext2_inode_info *ei; 182 ei = kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL); 183 if (!ei) 184 return NULL; 185 ei->i_block_alloc_info = NULL; 186 ei->vfs_inode.i_version = 1; 187 #ifdef CONFIG_QUOTA 188 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot)); 189 #endif 190 191 return &ei->vfs_inode; 192 } 193 194 static void ext2_i_callback(struct rcu_head *head) 195 { 196 struct inode *inode = container_of(head, struct inode, i_rcu); 197 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode)); 198 } 199 200 static void ext2_destroy_inode(struct inode *inode) 201 { 202 call_rcu(&inode->i_rcu, ext2_i_callback); 203 } 204 205 static void init_once(void *foo) 206 { 207 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo; 208 209 rwlock_init(&ei->i_meta_lock); 210 #ifdef CONFIG_EXT2_FS_XATTR 211 init_rwsem(&ei->xattr_sem); 212 #endif 213 mutex_init(&ei->truncate_mutex); 214 #ifdef CONFIG_FS_DAX 215 init_rwsem(&ei->dax_sem); 216 #endif 217 inode_init_once(&ei->vfs_inode); 218 } 219 220 static int __init init_inodecache(void) 221 { 222 ext2_inode_cachep = kmem_cache_create("ext2_inode_cache", 223 sizeof(struct ext2_inode_info), 224 0, (SLAB_RECLAIM_ACCOUNT| 225 SLAB_MEM_SPREAD|SLAB_ACCOUNT), 226 init_once); 227 if (ext2_inode_cachep == NULL) 228 return -ENOMEM; 229 return 0; 230 } 231 232 static void destroy_inodecache(void) 233 { 234 /* 235 * Make sure all delayed rcu free inodes are flushed before we 236 * destroy cache. 237 */ 238 rcu_barrier(); 239 kmem_cache_destroy(ext2_inode_cachep); 240 } 241 242 static int ext2_show_options(struct seq_file *seq, struct dentry *root) 243 { 244 struct super_block *sb = root->d_sb; 245 struct ext2_sb_info *sbi = EXT2_SB(sb); 246 struct ext2_super_block *es = sbi->s_es; 247 unsigned long def_mount_opts; 248 249 spin_lock(&sbi->s_lock); 250 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 251 252 if (sbi->s_sb_block != 1) 253 seq_printf(seq, ",sb=%lu", sbi->s_sb_block); 254 if (test_opt(sb, MINIX_DF)) 255 seq_puts(seq, ",minixdf"); 256 if (test_opt(sb, GRPID)) 257 seq_puts(seq, ",grpid"); 258 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS)) 259 seq_puts(seq, ",nogrpid"); 260 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) || 261 le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) { 262 seq_printf(seq, ",resuid=%u", 263 from_kuid_munged(&init_user_ns, sbi->s_resuid)); 264 } 265 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) || 266 le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) { 267 seq_printf(seq, ",resgid=%u", 268 from_kgid_munged(&init_user_ns, sbi->s_resgid)); 269 } 270 if (test_opt(sb, ERRORS_RO)) { 271 int def_errors = le16_to_cpu(es->s_errors); 272 273 if (def_errors == EXT2_ERRORS_PANIC || 274 def_errors == EXT2_ERRORS_CONTINUE) { 275 seq_puts(seq, ",errors=remount-ro"); 276 } 277 } 278 if (test_opt(sb, ERRORS_CONT)) 279 seq_puts(seq, ",errors=continue"); 280 if (test_opt(sb, ERRORS_PANIC)) 281 seq_puts(seq, ",errors=panic"); 282 if (test_opt(sb, NO_UID32)) 283 seq_puts(seq, ",nouid32"); 284 if (test_opt(sb, DEBUG)) 285 seq_puts(seq, ",debug"); 286 if (test_opt(sb, OLDALLOC)) 287 seq_puts(seq, ",oldalloc"); 288 289 #ifdef CONFIG_EXT2_FS_XATTR 290 if (test_opt(sb, XATTR_USER)) 291 seq_puts(seq, ",user_xattr"); 292 if (!test_opt(sb, XATTR_USER) && 293 (def_mount_opts & EXT2_DEFM_XATTR_USER)) { 294 seq_puts(seq, ",nouser_xattr"); 295 } 296 #endif 297 298 #ifdef CONFIG_EXT2_FS_POSIX_ACL 299 if (test_opt(sb, POSIX_ACL)) 300 seq_puts(seq, ",acl"); 301 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL)) 302 seq_puts(seq, ",noacl"); 303 #endif 304 305 if (test_opt(sb, NOBH)) 306 seq_puts(seq, ",nobh"); 307 308 #if defined(CONFIG_QUOTA) 309 if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA) 310 seq_puts(seq, ",usrquota"); 311 312 if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA) 313 seq_puts(seq, ",grpquota"); 314 #endif 315 316 #ifdef CONFIG_FS_DAX 317 if (sbi->s_mount_opt & EXT2_MOUNT_XIP) 318 seq_puts(seq, ",xip"); 319 if (sbi->s_mount_opt & EXT2_MOUNT_DAX) 320 seq_puts(seq, ",dax"); 321 #endif 322 323 if (!test_opt(sb, RESERVATION)) 324 seq_puts(seq, ",noreservation"); 325 326 spin_unlock(&sbi->s_lock); 327 return 0; 328 } 329 330 #ifdef CONFIG_QUOTA 331 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); 332 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); 333 static int ext2_quota_on(struct super_block *sb, int type, int format_id, 334 const struct path *path); 335 static struct dquot **ext2_get_dquots(struct inode *inode) 336 { 337 return EXT2_I(inode)->i_dquot; 338 } 339 340 static const struct quotactl_ops ext2_quotactl_ops = { 341 .quota_on = ext2_quota_on, 342 .quota_off = ext2_quota_off, 343 .quota_sync = dquot_quota_sync, 344 .get_state = dquot_get_state, 345 .set_info = dquot_set_dqinfo, 346 .get_dqblk = dquot_get_dqblk, 347 .set_dqblk = dquot_set_dqblk, 348 .get_nextdqblk = dquot_get_next_dqblk, 349 }; 350 #endif 351 352 static const struct super_operations ext2_sops = { 353 .alloc_inode = ext2_alloc_inode, 354 .destroy_inode = ext2_destroy_inode, 355 .write_inode = ext2_write_inode, 356 .evict_inode = ext2_evict_inode, 357 .put_super = ext2_put_super, 358 .sync_fs = ext2_sync_fs, 359 .freeze_fs = ext2_freeze, 360 .unfreeze_fs = ext2_unfreeze, 361 .statfs = ext2_statfs, 362 .remount_fs = ext2_remount, 363 .show_options = ext2_show_options, 364 #ifdef CONFIG_QUOTA 365 .quota_read = ext2_quota_read, 366 .quota_write = ext2_quota_write, 367 .get_dquots = ext2_get_dquots, 368 #endif 369 }; 370 371 static struct inode *ext2_nfs_get_inode(struct super_block *sb, 372 u64 ino, u32 generation) 373 { 374 struct inode *inode; 375 376 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) 377 return ERR_PTR(-ESTALE); 378 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) 379 return ERR_PTR(-ESTALE); 380 381 /* 382 * ext2_iget isn't quite right if the inode is currently unallocated! 383 * However ext2_iget currently does appropriate checks to handle stale 384 * inodes so everything is OK. 385 */ 386 inode = ext2_iget(sb, ino); 387 if (IS_ERR(inode)) 388 return ERR_CAST(inode); 389 if (generation && inode->i_generation != generation) { 390 /* we didn't find the right inode.. */ 391 iput(inode); 392 return ERR_PTR(-ESTALE); 393 } 394 return inode; 395 } 396 397 static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid, 398 int fh_len, int fh_type) 399 { 400 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 401 ext2_nfs_get_inode); 402 } 403 404 static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid, 405 int fh_len, int fh_type) 406 { 407 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 408 ext2_nfs_get_inode); 409 } 410 411 static const struct export_operations ext2_export_ops = { 412 .fh_to_dentry = ext2_fh_to_dentry, 413 .fh_to_parent = ext2_fh_to_parent, 414 .get_parent = ext2_get_parent, 415 }; 416 417 static unsigned long get_sb_block(void **data) 418 { 419 unsigned long sb_block; 420 char *options = (char *) *data; 421 422 if (!options || strncmp(options, "sb=", 3) != 0) 423 return 1; /* Default location */ 424 options += 3; 425 sb_block = simple_strtoul(options, &options, 0); 426 if (*options && *options != ',') { 427 printk("EXT2-fs: Invalid sb specification: %s\n", 428 (char *) *data); 429 return 1; 430 } 431 if (*options == ',') 432 options++; 433 *data = (void *) options; 434 return sb_block; 435 } 436 437 enum { 438 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 439 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, 440 Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug, 441 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, 442 Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota, 443 Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation 444 }; 445 446 static const match_table_t tokens = { 447 {Opt_bsd_df, "bsddf"}, 448 {Opt_minix_df, "minixdf"}, 449 {Opt_grpid, "grpid"}, 450 {Opt_grpid, "bsdgroups"}, 451 {Opt_nogrpid, "nogrpid"}, 452 {Opt_nogrpid, "sysvgroups"}, 453 {Opt_resgid, "resgid=%u"}, 454 {Opt_resuid, "resuid=%u"}, 455 {Opt_sb, "sb=%u"}, 456 {Opt_err_cont, "errors=continue"}, 457 {Opt_err_panic, "errors=panic"}, 458 {Opt_err_ro, "errors=remount-ro"}, 459 {Opt_nouid32, "nouid32"}, 460 {Opt_nocheck, "check=none"}, 461 {Opt_nocheck, "nocheck"}, 462 {Opt_debug, "debug"}, 463 {Opt_oldalloc, "oldalloc"}, 464 {Opt_orlov, "orlov"}, 465 {Opt_nobh, "nobh"}, 466 {Opt_user_xattr, "user_xattr"}, 467 {Opt_nouser_xattr, "nouser_xattr"}, 468 {Opt_acl, "acl"}, 469 {Opt_noacl, "noacl"}, 470 {Opt_xip, "xip"}, 471 {Opt_dax, "dax"}, 472 {Opt_grpquota, "grpquota"}, 473 {Opt_ignore, "noquota"}, 474 {Opt_quota, "quota"}, 475 {Opt_usrquota, "usrquota"}, 476 {Opt_reservation, "reservation"}, 477 {Opt_noreservation, "noreservation"}, 478 {Opt_err, NULL} 479 }; 480 481 static int parse_options(char *options, struct super_block *sb) 482 { 483 char *p; 484 struct ext2_sb_info *sbi = EXT2_SB(sb); 485 substring_t args[MAX_OPT_ARGS]; 486 int option; 487 kuid_t uid; 488 kgid_t gid; 489 490 if (!options) 491 return 1; 492 493 while ((p = strsep (&options, ",")) != NULL) { 494 int token; 495 if (!*p) 496 continue; 497 498 token = match_token(p, tokens, args); 499 switch (token) { 500 case Opt_bsd_df: 501 clear_opt (sbi->s_mount_opt, MINIX_DF); 502 break; 503 case Opt_minix_df: 504 set_opt (sbi->s_mount_opt, MINIX_DF); 505 break; 506 case Opt_grpid: 507 set_opt (sbi->s_mount_opt, GRPID); 508 break; 509 case Opt_nogrpid: 510 clear_opt (sbi->s_mount_opt, GRPID); 511 break; 512 case Opt_resuid: 513 if (match_int(&args[0], &option)) 514 return 0; 515 uid = make_kuid(current_user_ns(), option); 516 if (!uid_valid(uid)) { 517 ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option); 518 return 0; 519 520 } 521 sbi->s_resuid = uid; 522 break; 523 case Opt_resgid: 524 if (match_int(&args[0], &option)) 525 return 0; 526 gid = make_kgid(current_user_ns(), option); 527 if (!gid_valid(gid)) { 528 ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option); 529 return 0; 530 } 531 sbi->s_resgid = gid; 532 break; 533 case Opt_sb: 534 /* handled by get_sb_block() instead of here */ 535 /* *sb_block = match_int(&args[0]); */ 536 break; 537 case Opt_err_panic: 538 clear_opt (sbi->s_mount_opt, ERRORS_CONT); 539 clear_opt (sbi->s_mount_opt, ERRORS_RO); 540 set_opt (sbi->s_mount_opt, ERRORS_PANIC); 541 break; 542 case Opt_err_ro: 543 clear_opt (sbi->s_mount_opt, ERRORS_CONT); 544 clear_opt (sbi->s_mount_opt, ERRORS_PANIC); 545 set_opt (sbi->s_mount_opt, ERRORS_RO); 546 break; 547 case Opt_err_cont: 548 clear_opt (sbi->s_mount_opt, ERRORS_RO); 549 clear_opt (sbi->s_mount_opt, ERRORS_PANIC); 550 set_opt (sbi->s_mount_opt, ERRORS_CONT); 551 break; 552 case Opt_nouid32: 553 set_opt (sbi->s_mount_opt, NO_UID32); 554 break; 555 case Opt_nocheck: 556 clear_opt (sbi->s_mount_opt, CHECK); 557 break; 558 case Opt_debug: 559 set_opt (sbi->s_mount_opt, DEBUG); 560 break; 561 case Opt_oldalloc: 562 set_opt (sbi->s_mount_opt, OLDALLOC); 563 break; 564 case Opt_orlov: 565 clear_opt (sbi->s_mount_opt, OLDALLOC); 566 break; 567 case Opt_nobh: 568 set_opt (sbi->s_mount_opt, NOBH); 569 break; 570 #ifdef CONFIG_EXT2_FS_XATTR 571 case Opt_user_xattr: 572 set_opt (sbi->s_mount_opt, XATTR_USER); 573 break; 574 case Opt_nouser_xattr: 575 clear_opt (sbi->s_mount_opt, XATTR_USER); 576 break; 577 #else 578 case Opt_user_xattr: 579 case Opt_nouser_xattr: 580 ext2_msg(sb, KERN_INFO, "(no)user_xattr options" 581 "not supported"); 582 break; 583 #endif 584 #ifdef CONFIG_EXT2_FS_POSIX_ACL 585 case Opt_acl: 586 set_opt(sbi->s_mount_opt, POSIX_ACL); 587 break; 588 case Opt_noacl: 589 clear_opt(sbi->s_mount_opt, POSIX_ACL); 590 break; 591 #else 592 case Opt_acl: 593 case Opt_noacl: 594 ext2_msg(sb, KERN_INFO, 595 "(no)acl options not supported"); 596 break; 597 #endif 598 case Opt_xip: 599 ext2_msg(sb, KERN_INFO, "use dax instead of xip"); 600 set_opt(sbi->s_mount_opt, XIP); 601 /* Fall through */ 602 case Opt_dax: 603 #ifdef CONFIG_FS_DAX 604 ext2_msg(sb, KERN_WARNING, 605 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); 606 set_opt(sbi->s_mount_opt, DAX); 607 #else 608 ext2_msg(sb, KERN_INFO, "dax option not supported"); 609 #endif 610 break; 611 612 #if defined(CONFIG_QUOTA) 613 case Opt_quota: 614 case Opt_usrquota: 615 set_opt(sbi->s_mount_opt, USRQUOTA); 616 break; 617 618 case Opt_grpquota: 619 set_opt(sbi->s_mount_opt, GRPQUOTA); 620 break; 621 #else 622 case Opt_quota: 623 case Opt_usrquota: 624 case Opt_grpquota: 625 ext2_msg(sb, KERN_INFO, 626 "quota operations not supported"); 627 break; 628 #endif 629 630 case Opt_reservation: 631 set_opt(sbi->s_mount_opt, RESERVATION); 632 ext2_msg(sb, KERN_INFO, "reservations ON"); 633 break; 634 case Opt_noreservation: 635 clear_opt(sbi->s_mount_opt, RESERVATION); 636 ext2_msg(sb, KERN_INFO, "reservations OFF"); 637 break; 638 case Opt_ignore: 639 break; 640 default: 641 return 0; 642 } 643 } 644 return 1; 645 } 646 647 static int ext2_setup_super (struct super_block * sb, 648 struct ext2_super_block * es, 649 int read_only) 650 { 651 int res = 0; 652 struct ext2_sb_info *sbi = EXT2_SB(sb); 653 654 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { 655 ext2_msg(sb, KERN_ERR, 656 "error: revision level too high, " 657 "forcing read-only mode"); 658 res = MS_RDONLY; 659 } 660 if (read_only) 661 return res; 662 if (!(sbi->s_mount_state & EXT2_VALID_FS)) 663 ext2_msg(sb, KERN_WARNING, 664 "warning: mounting unchecked fs, " 665 "running e2fsck is recommended"); 666 else if ((sbi->s_mount_state & EXT2_ERROR_FS)) 667 ext2_msg(sb, KERN_WARNING, 668 "warning: mounting fs with errors, " 669 "running e2fsck is recommended"); 670 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 671 le16_to_cpu(es->s_mnt_count) >= 672 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 673 ext2_msg(sb, KERN_WARNING, 674 "warning: maximal mount count reached, " 675 "running e2fsck is recommended"); 676 else if (le32_to_cpu(es->s_checkinterval) && 677 (le32_to_cpu(es->s_lastcheck) + 678 le32_to_cpu(es->s_checkinterval) <= get_seconds())) 679 ext2_msg(sb, KERN_WARNING, 680 "warning: checktime reached, " 681 "running e2fsck is recommended"); 682 if (!le16_to_cpu(es->s_max_mnt_count)) 683 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); 684 le16_add_cpu(&es->s_mnt_count, 1); 685 if (test_opt (sb, DEBUG)) 686 ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, " 687 "bpg=%lu, ipg=%lu, mo=%04lx]", 688 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, 689 sbi->s_frag_size, 690 sbi->s_groups_count, 691 EXT2_BLOCKS_PER_GROUP(sb), 692 EXT2_INODES_PER_GROUP(sb), 693 sbi->s_mount_opt); 694 return res; 695 } 696 697 static int ext2_check_descriptors(struct super_block *sb) 698 { 699 int i; 700 struct ext2_sb_info *sbi = EXT2_SB(sb); 701 702 ext2_debug ("Checking group descriptors"); 703 704 for (i = 0; i < sbi->s_groups_count; i++) { 705 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL); 706 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i); 707 ext2_fsblk_t last_block; 708 709 if (i == sbi->s_groups_count - 1) 710 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; 711 else 712 last_block = first_block + 713 (EXT2_BLOCKS_PER_GROUP(sb) - 1); 714 715 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || 716 le32_to_cpu(gdp->bg_block_bitmap) > last_block) 717 { 718 ext2_error (sb, "ext2_check_descriptors", 719 "Block bitmap for group %d" 720 " not in group (block %lu)!", 721 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); 722 return 0; 723 } 724 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || 725 le32_to_cpu(gdp->bg_inode_bitmap) > last_block) 726 { 727 ext2_error (sb, "ext2_check_descriptors", 728 "Inode bitmap for group %d" 729 " not in group (block %lu)!", 730 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); 731 return 0; 732 } 733 if (le32_to_cpu(gdp->bg_inode_table) < first_block || 734 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > 735 last_block) 736 { 737 ext2_error (sb, "ext2_check_descriptors", 738 "Inode table for group %d" 739 " not in group (block %lu)!", 740 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); 741 return 0; 742 } 743 } 744 return 1; 745 } 746 747 /* 748 * Maximal file size. There is a direct, and {,double-,triple-}indirect 749 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. 750 * We need to be 1 filesystem block less than the 2^32 sector limit. 751 */ 752 static loff_t ext2_max_size(int bits) 753 { 754 loff_t res = EXT2_NDIR_BLOCKS; 755 int meta_blocks; 756 loff_t upper_limit; 757 758 /* This is calculated to be the largest file size for a 759 * dense, file such that the total number of 760 * sectors in the file, including data and all indirect blocks, 761 * does not exceed 2^32 -1 762 * __u32 i_blocks representing the total number of 763 * 512 bytes blocks of the file 764 */ 765 upper_limit = (1LL << 32) - 1; 766 767 /* total blocks in file system block size */ 768 upper_limit >>= (bits - 9); 769 770 771 /* indirect blocks */ 772 meta_blocks = 1; 773 /* double indirect blocks */ 774 meta_blocks += 1 + (1LL << (bits-2)); 775 /* tripple indirect blocks */ 776 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); 777 778 upper_limit -= meta_blocks; 779 upper_limit <<= bits; 780 781 res += 1LL << (bits-2); 782 res += 1LL << (2*(bits-2)); 783 res += 1LL << (3*(bits-2)); 784 res <<= bits; 785 if (res > upper_limit) 786 res = upper_limit; 787 788 if (res > MAX_LFS_FILESIZE) 789 res = MAX_LFS_FILESIZE; 790 791 return res; 792 } 793 794 static unsigned long descriptor_loc(struct super_block *sb, 795 unsigned long logic_sb_block, 796 int nr) 797 { 798 struct ext2_sb_info *sbi = EXT2_SB(sb); 799 unsigned long bg, first_meta_bg; 800 int has_super = 0; 801 802 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 803 804 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || 805 nr < first_meta_bg) 806 return (logic_sb_block + nr + 1); 807 bg = sbi->s_desc_per_block * nr; 808 if (ext2_bg_has_super(sb, bg)) 809 has_super = 1; 810 811 return ext2_group_first_block_no(sb, bg) + has_super; 812 } 813 814 static int ext2_fill_super(struct super_block *sb, void *data, int silent) 815 { 816 struct buffer_head * bh; 817 struct ext2_sb_info * sbi; 818 struct ext2_super_block * es; 819 struct inode *root; 820 unsigned long block; 821 unsigned long sb_block = get_sb_block(&data); 822 unsigned long logic_sb_block; 823 unsigned long offset = 0; 824 unsigned long def_mount_opts; 825 long ret = -EINVAL; 826 int blocksize = BLOCK_SIZE; 827 int db_count; 828 int i, j; 829 __le32 features; 830 int err; 831 832 err = -ENOMEM; 833 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 834 if (!sbi) 835 goto failed; 836 837 sbi->s_blockgroup_lock = 838 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); 839 if (!sbi->s_blockgroup_lock) { 840 kfree(sbi); 841 goto failed; 842 } 843 sb->s_fs_info = sbi; 844 sbi->s_sb_block = sb_block; 845 846 spin_lock_init(&sbi->s_lock); 847 848 /* 849 * See what the current blocksize for the device is, and 850 * use that as the blocksize. Otherwise (or if the blocksize 851 * is smaller than the default) use the default. 852 * This is important for devices that have a hardware 853 * sectorsize that is larger than the default. 854 */ 855 blocksize = sb_min_blocksize(sb, BLOCK_SIZE); 856 if (!blocksize) { 857 ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); 858 goto failed_sbi; 859 } 860 861 /* 862 * If the superblock doesn't start on a hardware sector boundary, 863 * calculate the offset. 864 */ 865 if (blocksize != BLOCK_SIZE) { 866 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 867 offset = (sb_block*BLOCK_SIZE) % blocksize; 868 } else { 869 logic_sb_block = sb_block; 870 } 871 872 if (!(bh = sb_bread(sb, logic_sb_block))) { 873 ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); 874 goto failed_sbi; 875 } 876 /* 877 * Note: s_es must be initialized as soon as possible because 878 * some ext2 macro-instructions depend on its value 879 */ 880 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 881 sbi->s_es = es; 882 sb->s_magic = le16_to_cpu(es->s_magic); 883 884 if (sb->s_magic != EXT2_SUPER_MAGIC) 885 goto cantfind_ext2; 886 887 /* Set defaults before we parse the mount options */ 888 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 889 if (def_mount_opts & EXT2_DEFM_DEBUG) 890 set_opt(sbi->s_mount_opt, DEBUG); 891 if (def_mount_opts & EXT2_DEFM_BSDGROUPS) 892 set_opt(sbi->s_mount_opt, GRPID); 893 if (def_mount_opts & EXT2_DEFM_UID16) 894 set_opt(sbi->s_mount_opt, NO_UID32); 895 #ifdef CONFIG_EXT2_FS_XATTR 896 if (def_mount_opts & EXT2_DEFM_XATTR_USER) 897 set_opt(sbi->s_mount_opt, XATTR_USER); 898 #endif 899 #ifdef CONFIG_EXT2_FS_POSIX_ACL 900 if (def_mount_opts & EXT2_DEFM_ACL) 901 set_opt(sbi->s_mount_opt, POSIX_ACL); 902 #endif 903 904 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) 905 set_opt(sbi->s_mount_opt, ERRORS_PANIC); 906 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) 907 set_opt(sbi->s_mount_opt, ERRORS_CONT); 908 else 909 set_opt(sbi->s_mount_opt, ERRORS_RO); 910 911 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); 912 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); 913 914 set_opt(sbi->s_mount_opt, RESERVATION); 915 916 if (!parse_options((char *) data, sb)) 917 goto failed_mount; 918 919 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 920 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? 921 MS_POSIXACL : 0); 922 sb->s_iflags |= SB_I_CGROUPWB; 923 924 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && 925 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || 926 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 927 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) 928 ext2_msg(sb, KERN_WARNING, 929 "warning: feature flags set on rev 0 fs, " 930 "running e2fsck is recommended"); 931 /* 932 * Check feature flags regardless of the revision level, since we 933 * previously didn't change the revision level when setting the flags, 934 * so there is a chance incompat flags are set on a rev 0 filesystem. 935 */ 936 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); 937 if (features) { 938 ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " 939 "unsupported optional features (%x)", 940 le32_to_cpu(features)); 941 goto failed_mount; 942 } 943 if (!(sb->s_flags & MS_RDONLY) && 944 (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ 945 ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " 946 "unsupported optional features (%x)", 947 le32_to_cpu(features)); 948 goto failed_mount; 949 } 950 951 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); 952 953 if (sbi->s_mount_opt & EXT2_MOUNT_DAX) { 954 err = bdev_dax_supported(sb, blocksize); 955 if (err) 956 goto failed_mount; 957 } 958 959 /* If the blocksize doesn't match, re-read the thing.. */ 960 if (sb->s_blocksize != blocksize) { 961 brelse(bh); 962 963 if (!sb_set_blocksize(sb, blocksize)) { 964 ext2_msg(sb, KERN_ERR, 965 "error: bad blocksize %d", blocksize); 966 goto failed_sbi; 967 } 968 969 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 970 offset = (sb_block*BLOCK_SIZE) % blocksize; 971 bh = sb_bread(sb, logic_sb_block); 972 if(!bh) { 973 ext2_msg(sb, KERN_ERR, "error: couldn't read" 974 "superblock on 2nd try"); 975 goto failed_sbi; 976 } 977 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 978 sbi->s_es = es; 979 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { 980 ext2_msg(sb, KERN_ERR, "error: magic mismatch"); 981 goto failed_mount; 982 } 983 } 984 985 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); 986 sb->s_max_links = EXT2_LINK_MAX; 987 988 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { 989 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; 990 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; 991 } else { 992 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 993 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 994 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || 995 !is_power_of_2(sbi->s_inode_size) || 996 (sbi->s_inode_size > blocksize)) { 997 ext2_msg(sb, KERN_ERR, 998 "error: unsupported inode size: %d", 999 sbi->s_inode_size); 1000 goto failed_mount; 1001 } 1002 } 1003 1004 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << 1005 le32_to_cpu(es->s_log_frag_size); 1006 if (sbi->s_frag_size == 0) 1007 goto cantfind_ext2; 1008 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; 1009 1010 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 1011 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); 1012 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 1013 1014 if (EXT2_INODE_SIZE(sb) == 0) 1015 goto cantfind_ext2; 1016 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); 1017 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) 1018 goto cantfind_ext2; 1019 sbi->s_itb_per_group = sbi->s_inodes_per_group / 1020 sbi->s_inodes_per_block; 1021 sbi->s_desc_per_block = sb->s_blocksize / 1022 sizeof (struct ext2_group_desc); 1023 sbi->s_sbh = bh; 1024 sbi->s_mount_state = le16_to_cpu(es->s_state); 1025 sbi->s_addr_per_block_bits = 1026 ilog2 (EXT2_ADDR_PER_BLOCK(sb)); 1027 sbi->s_desc_per_block_bits = 1028 ilog2 (EXT2_DESC_PER_BLOCK(sb)); 1029 1030 if (sb->s_magic != EXT2_SUPER_MAGIC) 1031 goto cantfind_ext2; 1032 1033 if (sb->s_blocksize != bh->b_size) { 1034 if (!silent) 1035 ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); 1036 goto failed_mount; 1037 } 1038 1039 if (sb->s_blocksize != sbi->s_frag_size) { 1040 ext2_msg(sb, KERN_ERR, 1041 "error: fragsize %lu != blocksize %lu" 1042 "(not supported yet)", 1043 sbi->s_frag_size, sb->s_blocksize); 1044 goto failed_mount; 1045 } 1046 1047 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { 1048 ext2_msg(sb, KERN_ERR, 1049 "error: #blocks per group too big: %lu", 1050 sbi->s_blocks_per_group); 1051 goto failed_mount; 1052 } 1053 if (sbi->s_frags_per_group > sb->s_blocksize * 8) { 1054 ext2_msg(sb, KERN_ERR, 1055 "error: #fragments per group too big: %lu", 1056 sbi->s_frags_per_group); 1057 goto failed_mount; 1058 } 1059 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { 1060 ext2_msg(sb, KERN_ERR, 1061 "error: #inodes per group too big: %lu", 1062 sbi->s_inodes_per_group); 1063 goto failed_mount; 1064 } 1065 1066 if (EXT2_BLOCKS_PER_GROUP(sb) == 0) 1067 goto cantfind_ext2; 1068 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - 1069 le32_to_cpu(es->s_first_data_block) - 1) 1070 / EXT2_BLOCKS_PER_GROUP(sb)) + 1; 1071 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / 1072 EXT2_DESC_PER_BLOCK(sb); 1073 sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL); 1074 if (sbi->s_group_desc == NULL) { 1075 ext2_msg(sb, KERN_ERR, "error: not enough memory"); 1076 goto failed_mount; 1077 } 1078 bgl_lock_init(sbi->s_blockgroup_lock); 1079 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); 1080 if (!sbi->s_debts) { 1081 ext2_msg(sb, KERN_ERR, "error: not enough memory"); 1082 goto failed_mount_group_desc; 1083 } 1084 for (i = 0; i < db_count; i++) { 1085 block = descriptor_loc(sb, logic_sb_block, i); 1086 sbi->s_group_desc[i] = sb_bread(sb, block); 1087 if (!sbi->s_group_desc[i]) { 1088 for (j = 0; j < i; j++) 1089 brelse (sbi->s_group_desc[j]); 1090 ext2_msg(sb, KERN_ERR, 1091 "error: unable to read group descriptors"); 1092 goto failed_mount_group_desc; 1093 } 1094 } 1095 if (!ext2_check_descriptors (sb)) { 1096 ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); 1097 goto failed_mount2; 1098 } 1099 sbi->s_gdb_count = db_count; 1100 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 1101 spin_lock_init(&sbi->s_next_gen_lock); 1102 1103 /* per fileystem reservation list head & lock */ 1104 spin_lock_init(&sbi->s_rsv_window_lock); 1105 sbi->s_rsv_window_root = RB_ROOT; 1106 /* 1107 * Add a single, static dummy reservation to the start of the 1108 * reservation window list --- it gives us a placeholder for 1109 * append-at-start-of-list which makes the allocation logic 1110 * _much_ simpler. 1111 */ 1112 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; 1113 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; 1114 sbi->s_rsv_window_head.rsv_alloc_hit = 0; 1115 sbi->s_rsv_window_head.rsv_goal_size = 0; 1116 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); 1117 1118 err = percpu_counter_init(&sbi->s_freeblocks_counter, 1119 ext2_count_free_blocks(sb), GFP_KERNEL); 1120 if (!err) { 1121 err = percpu_counter_init(&sbi->s_freeinodes_counter, 1122 ext2_count_free_inodes(sb), GFP_KERNEL); 1123 } 1124 if (!err) { 1125 err = percpu_counter_init(&sbi->s_dirs_counter, 1126 ext2_count_dirs(sb), GFP_KERNEL); 1127 } 1128 if (err) { 1129 ext2_msg(sb, KERN_ERR, "error: insufficient memory"); 1130 goto failed_mount3; 1131 } 1132 1133 #ifdef CONFIG_EXT2_FS_XATTR 1134 sbi->s_mb_cache = ext2_xattr_create_cache(); 1135 if (!sbi->s_mb_cache) { 1136 ext2_msg(sb, KERN_ERR, "Failed to create an mb_cache"); 1137 goto failed_mount3; 1138 } 1139 #endif 1140 /* 1141 * set up enough so that it can read an inode 1142 */ 1143 sb->s_op = &ext2_sops; 1144 sb->s_export_op = &ext2_export_ops; 1145 sb->s_xattr = ext2_xattr_handlers; 1146 1147 #ifdef CONFIG_QUOTA 1148 sb->dq_op = &dquot_operations; 1149 sb->s_qcop = &ext2_quotactl_ops; 1150 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1151 #endif 1152 1153 root = ext2_iget(sb, EXT2_ROOT_INO); 1154 if (IS_ERR(root)) { 1155 ret = PTR_ERR(root); 1156 goto failed_mount3; 1157 } 1158 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 1159 iput(root); 1160 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); 1161 goto failed_mount3; 1162 } 1163 1164 sb->s_root = d_make_root(root); 1165 if (!sb->s_root) { 1166 ext2_msg(sb, KERN_ERR, "error: get root inode failed"); 1167 ret = -ENOMEM; 1168 goto failed_mount3; 1169 } 1170 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 1171 ext2_msg(sb, KERN_WARNING, 1172 "warning: mounting ext3 filesystem as ext2"); 1173 if (ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY)) 1174 sb->s_flags |= MS_RDONLY; 1175 ext2_write_super(sb); 1176 return 0; 1177 1178 cantfind_ext2: 1179 if (!silent) 1180 ext2_msg(sb, KERN_ERR, 1181 "error: can't find an ext2 filesystem on dev %s.", 1182 sb->s_id); 1183 goto failed_mount; 1184 failed_mount3: 1185 if (sbi->s_mb_cache) 1186 ext2_xattr_destroy_cache(sbi->s_mb_cache); 1187 percpu_counter_destroy(&sbi->s_freeblocks_counter); 1188 percpu_counter_destroy(&sbi->s_freeinodes_counter); 1189 percpu_counter_destroy(&sbi->s_dirs_counter); 1190 failed_mount2: 1191 for (i = 0; i < db_count; i++) 1192 brelse(sbi->s_group_desc[i]); 1193 failed_mount_group_desc: 1194 kfree(sbi->s_group_desc); 1195 kfree(sbi->s_debts); 1196 failed_mount: 1197 brelse(bh); 1198 failed_sbi: 1199 sb->s_fs_info = NULL; 1200 kfree(sbi->s_blockgroup_lock); 1201 kfree(sbi); 1202 failed: 1203 return ret; 1204 } 1205 1206 static void ext2_clear_super_error(struct super_block *sb) 1207 { 1208 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; 1209 1210 if (buffer_write_io_error(sbh)) { 1211 /* 1212 * Oh, dear. A previous attempt to write the 1213 * superblock failed. This could happen because the 1214 * USB device was yanked out. Or it could happen to 1215 * be a transient write error and maybe the block will 1216 * be remapped. Nothing we can do but to retry the 1217 * write and hope for the best. 1218 */ 1219 ext2_msg(sb, KERN_ERR, 1220 "previous I/O error to superblock detected\n"); 1221 clear_buffer_write_io_error(sbh); 1222 set_buffer_uptodate(sbh); 1223 } 1224 } 1225 1226 void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, 1227 int wait) 1228 { 1229 ext2_clear_super_error(sb); 1230 spin_lock(&EXT2_SB(sb)->s_lock); 1231 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); 1232 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); 1233 es->s_wtime = cpu_to_le32(get_seconds()); 1234 /* unlock before we do IO */ 1235 spin_unlock(&EXT2_SB(sb)->s_lock); 1236 mark_buffer_dirty(EXT2_SB(sb)->s_sbh); 1237 if (wait) 1238 sync_dirty_buffer(EXT2_SB(sb)->s_sbh); 1239 } 1240 1241 /* 1242 * In the second extended file system, it is not necessary to 1243 * write the super block since we use a mapping of the 1244 * disk super block in a buffer. 1245 * 1246 * However, this function is still used to set the fs valid 1247 * flags to 0. We need to set this flag to 0 since the fs 1248 * may have been checked while mounted and e2fsck may have 1249 * set s_state to EXT2_VALID_FS after some corrections. 1250 */ 1251 static int ext2_sync_fs(struct super_block *sb, int wait) 1252 { 1253 struct ext2_sb_info *sbi = EXT2_SB(sb); 1254 struct ext2_super_block *es = EXT2_SB(sb)->s_es; 1255 1256 /* 1257 * Write quota structures to quota file, sync_blockdev() will write 1258 * them to disk later 1259 */ 1260 dquot_writeback_dquots(sb, -1); 1261 1262 spin_lock(&sbi->s_lock); 1263 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { 1264 ext2_debug("setting valid to 0\n"); 1265 es->s_state &= cpu_to_le16(~EXT2_VALID_FS); 1266 } 1267 spin_unlock(&sbi->s_lock); 1268 ext2_sync_super(sb, es, wait); 1269 return 0; 1270 } 1271 1272 static int ext2_freeze(struct super_block *sb) 1273 { 1274 struct ext2_sb_info *sbi = EXT2_SB(sb); 1275 1276 /* 1277 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared 1278 * because we have unattached inodes and thus filesystem is not fully 1279 * consistent. 1280 */ 1281 if (atomic_long_read(&sb->s_remove_count)) { 1282 ext2_sync_fs(sb, 1); 1283 return 0; 1284 } 1285 /* Set EXT2_FS_VALID flag */ 1286 spin_lock(&sbi->s_lock); 1287 sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state); 1288 spin_unlock(&sbi->s_lock); 1289 ext2_sync_super(sb, sbi->s_es, 1); 1290 1291 return 0; 1292 } 1293 1294 static int ext2_unfreeze(struct super_block *sb) 1295 { 1296 /* Just write sb to clear EXT2_VALID_FS flag */ 1297 ext2_write_super(sb); 1298 1299 return 0; 1300 } 1301 1302 static void ext2_write_super(struct super_block *sb) 1303 { 1304 if (!(sb->s_flags & MS_RDONLY)) 1305 ext2_sync_fs(sb, 1); 1306 } 1307 1308 static int ext2_remount (struct super_block * sb, int * flags, char * data) 1309 { 1310 struct ext2_sb_info * sbi = EXT2_SB(sb); 1311 struct ext2_super_block * es; 1312 struct ext2_mount_options old_opts; 1313 unsigned long old_sb_flags; 1314 int err; 1315 1316 sync_filesystem(sb); 1317 spin_lock(&sbi->s_lock); 1318 1319 /* Store the old options */ 1320 old_sb_flags = sb->s_flags; 1321 old_opts.s_mount_opt = sbi->s_mount_opt; 1322 old_opts.s_resuid = sbi->s_resuid; 1323 old_opts.s_resgid = sbi->s_resgid; 1324 1325 /* 1326 * Allow the "check" option to be passed as a remount option. 1327 */ 1328 if (!parse_options(data, sb)) { 1329 err = -EINVAL; 1330 goto restore_opts; 1331 } 1332 1333 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 1334 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 1335 1336 es = sbi->s_es; 1337 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT2_MOUNT_DAX) { 1338 ext2_msg(sb, KERN_WARNING, "warning: refusing change of " 1339 "dax flag with busy inodes while remounting"); 1340 sbi->s_mount_opt ^= EXT2_MOUNT_DAX; 1341 } 1342 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) { 1343 spin_unlock(&sbi->s_lock); 1344 return 0; 1345 } 1346 if (*flags & MS_RDONLY) { 1347 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || 1348 !(sbi->s_mount_state & EXT2_VALID_FS)) { 1349 spin_unlock(&sbi->s_lock); 1350 return 0; 1351 } 1352 1353 /* 1354 * OK, we are remounting a valid rw partition rdonly, so set 1355 * the rdonly flag and then mark the partition as valid again. 1356 */ 1357 es->s_state = cpu_to_le16(sbi->s_mount_state); 1358 es->s_mtime = cpu_to_le32(get_seconds()); 1359 spin_unlock(&sbi->s_lock); 1360 1361 err = dquot_suspend(sb, -1); 1362 if (err < 0) { 1363 spin_lock(&sbi->s_lock); 1364 goto restore_opts; 1365 } 1366 1367 ext2_sync_super(sb, es, 1); 1368 } else { 1369 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, 1370 ~EXT2_FEATURE_RO_COMPAT_SUPP); 1371 if (ret) { 1372 ext2_msg(sb, KERN_WARNING, 1373 "warning: couldn't remount RDWR because of " 1374 "unsupported optional features (%x).", 1375 le32_to_cpu(ret)); 1376 err = -EROFS; 1377 goto restore_opts; 1378 } 1379 /* 1380 * Mounting a RDONLY partition read-write, so reread and 1381 * store the current valid flag. (It may have been changed 1382 * by e2fsck since we originally mounted the partition.) 1383 */ 1384 sbi->s_mount_state = le16_to_cpu(es->s_state); 1385 if (!ext2_setup_super (sb, es, 0)) 1386 sb->s_flags &= ~MS_RDONLY; 1387 spin_unlock(&sbi->s_lock); 1388 1389 ext2_write_super(sb); 1390 1391 dquot_resume(sb, -1); 1392 } 1393 1394 return 0; 1395 restore_opts: 1396 sbi->s_mount_opt = old_opts.s_mount_opt; 1397 sbi->s_resuid = old_opts.s_resuid; 1398 sbi->s_resgid = old_opts.s_resgid; 1399 sb->s_flags = old_sb_flags; 1400 spin_unlock(&sbi->s_lock); 1401 return err; 1402 } 1403 1404 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) 1405 { 1406 struct super_block *sb = dentry->d_sb; 1407 struct ext2_sb_info *sbi = EXT2_SB(sb); 1408 struct ext2_super_block *es = sbi->s_es; 1409 u64 fsid; 1410 1411 spin_lock(&sbi->s_lock); 1412 1413 if (test_opt (sb, MINIX_DF)) 1414 sbi->s_overhead_last = 0; 1415 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { 1416 unsigned long i, overhead = 0; 1417 smp_rmb(); 1418 1419 /* 1420 * Compute the overhead (FS structures). This is constant 1421 * for a given filesystem unless the number of block groups 1422 * changes so we cache the previous value until it does. 1423 */ 1424 1425 /* 1426 * All of the blocks before first_data_block are 1427 * overhead 1428 */ 1429 overhead = le32_to_cpu(es->s_first_data_block); 1430 1431 /* 1432 * Add the overhead attributed to the superblock and 1433 * block group descriptors. If the sparse superblocks 1434 * feature is turned on, then not all groups have this. 1435 */ 1436 for (i = 0; i < sbi->s_groups_count; i++) 1437 overhead += ext2_bg_has_super(sb, i) + 1438 ext2_bg_num_gdb(sb, i); 1439 1440 /* 1441 * Every block group has an inode bitmap, a block 1442 * bitmap, and an inode table. 1443 */ 1444 overhead += (sbi->s_groups_count * 1445 (2 + sbi->s_itb_per_group)); 1446 sbi->s_overhead_last = overhead; 1447 smp_wmb(); 1448 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); 1449 } 1450 1451 buf->f_type = EXT2_SUPER_MAGIC; 1452 buf->f_bsize = sb->s_blocksize; 1453 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; 1454 buf->f_bfree = ext2_count_free_blocks(sb); 1455 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); 1456 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); 1457 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) 1458 buf->f_bavail = 0; 1459 buf->f_files = le32_to_cpu(es->s_inodes_count); 1460 buf->f_ffree = ext2_count_free_inodes(sb); 1461 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); 1462 buf->f_namelen = EXT2_NAME_LEN; 1463 fsid = le64_to_cpup((void *)es->s_uuid) ^ 1464 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 1465 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 1466 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 1467 spin_unlock(&sbi->s_lock); 1468 return 0; 1469 } 1470 1471 static struct dentry *ext2_mount(struct file_system_type *fs_type, 1472 int flags, const char *dev_name, void *data) 1473 { 1474 return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super); 1475 } 1476 1477 #ifdef CONFIG_QUOTA 1478 1479 /* Read data from quotafile - avoid pagecache and such because we cannot afford 1480 * acquiring the locks... As quota files are never truncated and quota code 1481 * itself serializes the operations (and no one else should touch the files) 1482 * we don't have to be afraid of races */ 1483 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, 1484 size_t len, loff_t off) 1485 { 1486 struct inode *inode = sb_dqopt(sb)->files[type]; 1487 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1488 int err = 0; 1489 int offset = off & (sb->s_blocksize - 1); 1490 int tocopy; 1491 size_t toread; 1492 struct buffer_head tmp_bh; 1493 struct buffer_head *bh; 1494 loff_t i_size = i_size_read(inode); 1495 1496 if (off > i_size) 1497 return 0; 1498 if (off+len > i_size) 1499 len = i_size-off; 1500 toread = len; 1501 while (toread > 0) { 1502 tocopy = sb->s_blocksize - offset < toread ? 1503 sb->s_blocksize - offset : toread; 1504 1505 tmp_bh.b_state = 0; 1506 tmp_bh.b_size = sb->s_blocksize; 1507 err = ext2_get_block(inode, blk, &tmp_bh, 0); 1508 if (err < 0) 1509 return err; 1510 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 1511 memset(data, 0, tocopy); 1512 else { 1513 bh = sb_bread(sb, tmp_bh.b_blocknr); 1514 if (!bh) 1515 return -EIO; 1516 memcpy(data, bh->b_data+offset, tocopy); 1517 brelse(bh); 1518 } 1519 offset = 0; 1520 toread -= tocopy; 1521 data += tocopy; 1522 blk++; 1523 } 1524 return len; 1525 } 1526 1527 /* Write to quotafile */ 1528 static ssize_t ext2_quota_write(struct super_block *sb, int type, 1529 const char *data, size_t len, loff_t off) 1530 { 1531 struct inode *inode = sb_dqopt(sb)->files[type]; 1532 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1533 int err = 0; 1534 int offset = off & (sb->s_blocksize - 1); 1535 int tocopy; 1536 size_t towrite = len; 1537 struct buffer_head tmp_bh; 1538 struct buffer_head *bh; 1539 1540 while (towrite > 0) { 1541 tocopy = sb->s_blocksize - offset < towrite ? 1542 sb->s_blocksize - offset : towrite; 1543 1544 tmp_bh.b_state = 0; 1545 tmp_bh.b_size = sb->s_blocksize; 1546 err = ext2_get_block(inode, blk, &tmp_bh, 1); 1547 if (err < 0) 1548 goto out; 1549 if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) 1550 bh = sb_bread(sb, tmp_bh.b_blocknr); 1551 else 1552 bh = sb_getblk(sb, tmp_bh.b_blocknr); 1553 if (unlikely(!bh)) { 1554 err = -EIO; 1555 goto out; 1556 } 1557 lock_buffer(bh); 1558 memcpy(bh->b_data+offset, data, tocopy); 1559 flush_dcache_page(bh->b_page); 1560 set_buffer_uptodate(bh); 1561 mark_buffer_dirty(bh); 1562 unlock_buffer(bh); 1563 brelse(bh); 1564 offset = 0; 1565 towrite -= tocopy; 1566 data += tocopy; 1567 blk++; 1568 } 1569 out: 1570 if (len == towrite) 1571 return err; 1572 if (inode->i_size < off+len-towrite) 1573 i_size_write(inode, off+len-towrite); 1574 inode->i_version++; 1575 inode->i_mtime = inode->i_ctime = current_time(inode); 1576 mark_inode_dirty(inode); 1577 return len - towrite; 1578 } 1579 1580 static int ext2_quota_on(struct super_block *sb, int type, int format_id, 1581 const struct path *path) 1582 { 1583 int err; 1584 struct inode *inode; 1585 1586 err = dquot_quota_on(sb, type, format_id, path); 1587 if (err) 1588 return err; 1589 1590 inode = d_inode(path->dentry); 1591 inode_lock(inode); 1592 EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL; 1593 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, 1594 S_NOATIME | S_IMMUTABLE); 1595 inode_unlock(inode); 1596 mark_inode_dirty(inode); 1597 1598 return 0; 1599 } 1600 1601 static int ext2_quota_off(struct super_block *sb, int type) 1602 { 1603 struct inode *inode = sb_dqopt(sb)->files[type]; 1604 int err; 1605 1606 if (!inode || !igrab(inode)) 1607 goto out; 1608 1609 err = dquot_quota_off(sb, type); 1610 if (err) 1611 goto out_put; 1612 1613 inode_lock(inode); 1614 EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL); 1615 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); 1616 inode_unlock(inode); 1617 mark_inode_dirty(inode); 1618 out_put: 1619 iput(inode); 1620 return err; 1621 out: 1622 return dquot_quota_off(sb, type); 1623 } 1624 1625 #endif 1626 1627 static struct file_system_type ext2_fs_type = { 1628 .owner = THIS_MODULE, 1629 .name = "ext2", 1630 .mount = ext2_mount, 1631 .kill_sb = kill_block_super, 1632 .fs_flags = FS_REQUIRES_DEV, 1633 }; 1634 MODULE_ALIAS_FS("ext2"); 1635 1636 static int __init init_ext2_fs(void) 1637 { 1638 int err; 1639 1640 err = init_inodecache(); 1641 if (err) 1642 return err; 1643 err = register_filesystem(&ext2_fs_type); 1644 if (err) 1645 goto out; 1646 return 0; 1647 out: 1648 destroy_inodecache(); 1649 return err; 1650 } 1651 1652 static void __exit exit_ext2_fs(void) 1653 { 1654 unregister_filesystem(&ext2_fs_type); 1655 destroy_inodecache(); 1656 } 1657 1658 MODULE_AUTHOR("Remy Card and others"); 1659 MODULE_DESCRIPTION("Second Extended Filesystem"); 1660 MODULE_LICENSE("GPL"); 1661 module_init(init_ext2_fs) 1662 module_exit(exit_ext2_fs) 1663