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