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