1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/fs/ext2/super.c 4 * 5 * Copyright (C) 1992, 1993, 1994, 1995 6 * Remy Card (card@masi.ibp.fr) 7 * Laboratoire MASI - Institut Blaise Pascal 8 * Universite Pierre et Marie Curie (Paris VI) 9 * 10 * from 11 * 12 * linux/fs/minix/inode.c 13 * 14 * Copyright (C) 1991, 1992 Linus Torvalds 15 * 16 * Big-endian to little-endian byte-swapping/bitmaps by 17 * David S. Miller (davem@caip.rutgers.edu), 1995 18 */ 19 20 #include <linux/module.h> 21 #include <linux/string.h> 22 #include <linux/fs.h> 23 #include <linux/slab.h> 24 #include <linux/init.h> 25 #include <linux/blkdev.h> 26 #include <linux/parser.h> 27 #include <linux/random.h> 28 #include <linux/buffer_head.h> 29 #include <linux/exportfs.h> 30 #include <linux/vfs.h> 31 #include <linux/seq_file.h> 32 #include <linux/mount.h> 33 #include <linux/log2.h> 34 #include <linux/quotaops.h> 35 #include <linux/uaccess.h> 36 #include <linux/dax.h> 37 #include <linux/iversion.h> 38 #include "ext2.h" 39 #include "xattr.h" 40 #include "acl.h" 41 42 static void ext2_write_super(struct super_block *sb); 43 static int ext2_remount (struct super_block * sb, int * flags, char * data); 44 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf); 45 static int ext2_sync_fs(struct super_block *sb, int wait); 46 static int ext2_freeze(struct super_block *sb); 47 static int ext2_unfreeze(struct super_block *sb); 48 49 void ext2_error(struct super_block *sb, const char *function, 50 const char *fmt, ...) 51 { 52 struct va_format vaf; 53 va_list args; 54 struct ext2_sb_info *sbi = EXT2_SB(sb); 55 struct ext2_super_block *es = sbi->s_es; 56 57 if (!sb_rdonly(sb)) { 58 spin_lock(&sbi->s_lock); 59 sbi->s_mount_state |= EXT2_ERROR_FS; 60 es->s_state |= cpu_to_le16(EXT2_ERROR_FS); 61 spin_unlock(&sbi->s_lock); 62 ext2_sync_super(sb, es, 1); 63 } 64 65 va_start(args, fmt); 66 67 vaf.fmt = fmt; 68 vaf.va = &args; 69 70 printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n", 71 sb->s_id, function, &vaf); 72 73 va_end(args); 74 75 if (test_opt(sb, ERRORS_PANIC)) 76 panic("EXT2-fs: panic from previous error\n"); 77 if (!sb_rdonly(sb) && test_opt(sb, ERRORS_RO)) { 78 ext2_msg(sb, KERN_CRIT, 79 "error: remounting filesystem read-only"); 80 sb->s_flags |= SB_RDONLY; 81 } 82 } 83 84 void ext2_msg(struct super_block *sb, const char *prefix, 85 const char *fmt, ...) 86 { 87 struct va_format vaf; 88 va_list args; 89 90 va_start(args, fmt); 91 92 vaf.fmt = fmt; 93 vaf.va = &args; 94 95 printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf); 96 97 va_end(args); 98 } 99 100 /* 101 * This must be called with sbi->s_lock held. 102 */ 103 void ext2_update_dynamic_rev(struct super_block *sb) 104 { 105 struct ext2_super_block *es = EXT2_SB(sb)->s_es; 106 107 if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV) 108 return; 109 110 ext2_msg(sb, KERN_WARNING, 111 "warning: updating to rev %d because of " 112 "new feature flag, running e2fsck is recommended", 113 EXT2_DYNAMIC_REV); 114 115 es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO); 116 es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE); 117 es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV); 118 /* leave es->s_feature_*compat flags alone */ 119 /* es->s_uuid will be set by e2fsck if empty */ 120 121 /* 122 * The rest of the superblock fields should be zero, and if not it 123 * means they are likely already in use, so leave them alone. We 124 * can leave it up to e2fsck to clean up any inconsistencies there. 125 */ 126 } 127 128 #ifdef CONFIG_QUOTA 129 static int ext2_quota_off(struct super_block *sb, int type); 130 131 static void ext2_quota_off_umount(struct super_block *sb) 132 { 133 int type; 134 135 for (type = 0; type < MAXQUOTAS; type++) 136 ext2_quota_off(sb, type); 137 } 138 #else 139 static inline void ext2_quota_off_umount(struct super_block *sb) 140 { 141 } 142 #endif 143 144 static void ext2_put_super (struct super_block * sb) 145 { 146 int db_count; 147 int i; 148 struct ext2_sb_info *sbi = EXT2_SB(sb); 149 150 ext2_quota_off_umount(sb); 151 152 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 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 inode_set_iversion(&ei->vfs_inode, 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_free_in_core_inode(struct inode *inode) 196 { 197 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode)); 198 } 199 200 static void init_once(void *foo) 201 { 202 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo; 203 204 rwlock_init(&ei->i_meta_lock); 205 #ifdef CONFIG_EXT2_FS_XATTR 206 init_rwsem(&ei->xattr_sem); 207 #endif 208 mutex_init(&ei->truncate_mutex); 209 inode_init_once(&ei->vfs_inode); 210 } 211 212 static int __init init_inodecache(void) 213 { 214 ext2_inode_cachep = kmem_cache_create_usercopy("ext2_inode_cache", 215 sizeof(struct ext2_inode_info), 0, 216 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| 217 SLAB_ACCOUNT), 218 offsetof(struct ext2_inode_info, i_data), 219 sizeof_field(struct ext2_inode_info, i_data), 220 init_once); 221 if (ext2_inode_cachep == NULL) 222 return -ENOMEM; 223 return 0; 224 } 225 226 static void destroy_inodecache(void) 227 { 228 /* 229 * Make sure all delayed rcu free inodes are flushed before we 230 * destroy cache. 231 */ 232 rcu_barrier(); 233 kmem_cache_destroy(ext2_inode_cachep); 234 } 235 236 static int ext2_show_options(struct seq_file *seq, struct dentry *root) 237 { 238 struct super_block *sb = root->d_sb; 239 struct ext2_sb_info *sbi = EXT2_SB(sb); 240 struct ext2_super_block *es = sbi->s_es; 241 unsigned long def_mount_opts; 242 243 spin_lock(&sbi->s_lock); 244 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 245 246 if (sbi->s_sb_block != 1) 247 seq_printf(seq, ",sb=%lu", sbi->s_sb_block); 248 if (test_opt(sb, MINIX_DF)) 249 seq_puts(seq, ",minixdf"); 250 if (test_opt(sb, GRPID)) 251 seq_puts(seq, ",grpid"); 252 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS)) 253 seq_puts(seq, ",nogrpid"); 254 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) || 255 le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) { 256 seq_printf(seq, ",resuid=%u", 257 from_kuid_munged(&init_user_ns, sbi->s_resuid)); 258 } 259 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) || 260 le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) { 261 seq_printf(seq, ",resgid=%u", 262 from_kgid_munged(&init_user_ns, sbi->s_resgid)); 263 } 264 if (test_opt(sb, ERRORS_RO)) { 265 int def_errors = le16_to_cpu(es->s_errors); 266 267 if (def_errors == EXT2_ERRORS_PANIC || 268 def_errors == EXT2_ERRORS_CONTINUE) { 269 seq_puts(seq, ",errors=remount-ro"); 270 } 271 } 272 if (test_opt(sb, ERRORS_CONT)) 273 seq_puts(seq, ",errors=continue"); 274 if (test_opt(sb, ERRORS_PANIC)) 275 seq_puts(seq, ",errors=panic"); 276 if (test_opt(sb, NO_UID32)) 277 seq_puts(seq, ",nouid32"); 278 if (test_opt(sb, DEBUG)) 279 seq_puts(seq, ",debug"); 280 if (test_opt(sb, OLDALLOC)) 281 seq_puts(seq, ",oldalloc"); 282 283 #ifdef CONFIG_EXT2_FS_XATTR 284 if (test_opt(sb, XATTR_USER)) 285 seq_puts(seq, ",user_xattr"); 286 if (!test_opt(sb, XATTR_USER) && 287 (def_mount_opts & EXT2_DEFM_XATTR_USER)) { 288 seq_puts(seq, ",nouser_xattr"); 289 } 290 #endif 291 292 #ifdef CONFIG_EXT2_FS_POSIX_ACL 293 if (test_opt(sb, POSIX_ACL)) 294 seq_puts(seq, ",acl"); 295 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL)) 296 seq_puts(seq, ",noacl"); 297 #endif 298 299 if (test_opt(sb, NOBH)) 300 seq_puts(seq, ",nobh"); 301 302 if (test_opt(sb, USRQUOTA)) 303 seq_puts(seq, ",usrquota"); 304 305 if (test_opt(sb, GRPQUOTA)) 306 seq_puts(seq, ",grpquota"); 307 308 if (test_opt(sb, XIP)) 309 seq_puts(seq, ",xip"); 310 311 if (test_opt(sb, DAX)) 312 seq_puts(seq, ",dax"); 313 314 if (!test_opt(sb, RESERVATION)) 315 seq_puts(seq, ",noreservation"); 316 317 spin_unlock(&sbi->s_lock); 318 return 0; 319 } 320 321 #ifdef CONFIG_QUOTA 322 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); 323 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); 324 static int ext2_quota_on(struct super_block *sb, int type, int format_id, 325 const struct path *path); 326 static struct dquot **ext2_get_dquots(struct inode *inode) 327 { 328 return EXT2_I(inode)->i_dquot; 329 } 330 331 static const struct quotactl_ops ext2_quotactl_ops = { 332 .quota_on = ext2_quota_on, 333 .quota_off = ext2_quota_off, 334 .quota_sync = dquot_quota_sync, 335 .get_state = dquot_get_state, 336 .set_info = dquot_set_dqinfo, 337 .get_dqblk = dquot_get_dqblk, 338 .set_dqblk = dquot_set_dqblk, 339 .get_nextdqblk = dquot_get_next_dqblk, 340 }; 341 #endif 342 343 static const struct super_operations ext2_sops = { 344 .alloc_inode = ext2_alloc_inode, 345 .free_inode = ext2_free_in_core_inode, 346 .write_inode = ext2_write_inode, 347 .evict_inode = ext2_evict_inode, 348 .put_super = ext2_put_super, 349 .sync_fs = ext2_sync_fs, 350 .freeze_fs = ext2_freeze, 351 .unfreeze_fs = ext2_unfreeze, 352 .statfs = ext2_statfs, 353 .remount_fs = ext2_remount, 354 .show_options = ext2_show_options, 355 #ifdef CONFIG_QUOTA 356 .quota_read = ext2_quota_read, 357 .quota_write = ext2_quota_write, 358 .get_dquots = ext2_get_dquots, 359 #endif 360 }; 361 362 static struct inode *ext2_nfs_get_inode(struct super_block *sb, 363 u64 ino, u32 generation) 364 { 365 struct inode *inode; 366 367 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) 368 return ERR_PTR(-ESTALE); 369 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) 370 return ERR_PTR(-ESTALE); 371 372 /* 373 * ext2_iget isn't quite right if the inode is currently unallocated! 374 * However ext2_iget currently does appropriate checks to handle stale 375 * inodes so everything is OK. 376 */ 377 inode = ext2_iget(sb, ino); 378 if (IS_ERR(inode)) 379 return ERR_CAST(inode); 380 if (generation && inode->i_generation != generation) { 381 /* we didn't find the right inode.. */ 382 iput(inode); 383 return ERR_PTR(-ESTALE); 384 } 385 return inode; 386 } 387 388 static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid, 389 int fh_len, int fh_type) 390 { 391 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 392 ext2_nfs_get_inode); 393 } 394 395 static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid, 396 int fh_len, int fh_type) 397 { 398 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 399 ext2_nfs_get_inode); 400 } 401 402 static const struct export_operations ext2_export_ops = { 403 .fh_to_dentry = ext2_fh_to_dentry, 404 .fh_to_parent = ext2_fh_to_parent, 405 .get_parent = ext2_get_parent, 406 }; 407 408 static unsigned long get_sb_block(void **data) 409 { 410 unsigned long sb_block; 411 char *options = (char *) *data; 412 413 if (!options || strncmp(options, "sb=", 3) != 0) 414 return 1; /* Default location */ 415 options += 3; 416 sb_block = simple_strtoul(options, &options, 0); 417 if (*options && *options != ',') { 418 printk("EXT2-fs: Invalid sb specification: %s\n", 419 (char *) *data); 420 return 1; 421 } 422 if (*options == ',') 423 options++; 424 *data = (void *) options; 425 return sb_block; 426 } 427 428 enum { 429 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 430 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, 431 Opt_err_ro, Opt_nouid32, Opt_debug, 432 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, 433 Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota, 434 Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation 435 }; 436 437 static const match_table_t tokens = { 438 {Opt_bsd_df, "bsddf"}, 439 {Opt_minix_df, "minixdf"}, 440 {Opt_grpid, "grpid"}, 441 {Opt_grpid, "bsdgroups"}, 442 {Opt_nogrpid, "nogrpid"}, 443 {Opt_nogrpid, "sysvgroups"}, 444 {Opt_resgid, "resgid=%u"}, 445 {Opt_resuid, "resuid=%u"}, 446 {Opt_sb, "sb=%u"}, 447 {Opt_err_cont, "errors=continue"}, 448 {Opt_err_panic, "errors=panic"}, 449 {Opt_err_ro, "errors=remount-ro"}, 450 {Opt_nouid32, "nouid32"}, 451 {Opt_debug, "debug"}, 452 {Opt_oldalloc, "oldalloc"}, 453 {Opt_orlov, "orlov"}, 454 {Opt_nobh, "nobh"}, 455 {Opt_user_xattr, "user_xattr"}, 456 {Opt_nouser_xattr, "nouser_xattr"}, 457 {Opt_acl, "acl"}, 458 {Opt_noacl, "noacl"}, 459 {Opt_xip, "xip"}, 460 {Opt_dax, "dax"}, 461 {Opt_grpquota, "grpquota"}, 462 {Opt_ignore, "noquota"}, 463 {Opt_quota, "quota"}, 464 {Opt_usrquota, "usrquota"}, 465 {Opt_reservation, "reservation"}, 466 {Opt_noreservation, "noreservation"}, 467 {Opt_err, NULL} 468 }; 469 470 static int parse_options(char *options, struct super_block *sb, 471 struct ext2_mount_options *opts) 472 { 473 char *p; 474 substring_t args[MAX_OPT_ARGS]; 475 int option; 476 kuid_t uid; 477 kgid_t gid; 478 479 if (!options) 480 return 1; 481 482 while ((p = strsep (&options, ",")) != NULL) { 483 int token; 484 if (!*p) 485 continue; 486 487 token = match_token(p, tokens, args); 488 switch (token) { 489 case Opt_bsd_df: 490 clear_opt (opts->s_mount_opt, MINIX_DF); 491 break; 492 case Opt_minix_df: 493 set_opt (opts->s_mount_opt, MINIX_DF); 494 break; 495 case Opt_grpid: 496 set_opt (opts->s_mount_opt, GRPID); 497 break; 498 case Opt_nogrpid: 499 clear_opt (opts->s_mount_opt, GRPID); 500 break; 501 case Opt_resuid: 502 if (match_int(&args[0], &option)) 503 return 0; 504 uid = make_kuid(current_user_ns(), option); 505 if (!uid_valid(uid)) { 506 ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option); 507 return 0; 508 509 } 510 opts->s_resuid = uid; 511 break; 512 case Opt_resgid: 513 if (match_int(&args[0], &option)) 514 return 0; 515 gid = make_kgid(current_user_ns(), option); 516 if (!gid_valid(gid)) { 517 ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option); 518 return 0; 519 } 520 opts->s_resgid = gid; 521 break; 522 case Opt_sb: 523 /* handled by get_sb_block() instead of here */ 524 /* *sb_block = match_int(&args[0]); */ 525 break; 526 case Opt_err_panic: 527 clear_opt (opts->s_mount_opt, ERRORS_CONT); 528 clear_opt (opts->s_mount_opt, ERRORS_RO); 529 set_opt (opts->s_mount_opt, ERRORS_PANIC); 530 break; 531 case Opt_err_ro: 532 clear_opt (opts->s_mount_opt, ERRORS_CONT); 533 clear_opt (opts->s_mount_opt, ERRORS_PANIC); 534 set_opt (opts->s_mount_opt, ERRORS_RO); 535 break; 536 case Opt_err_cont: 537 clear_opt (opts->s_mount_opt, ERRORS_RO); 538 clear_opt (opts->s_mount_opt, ERRORS_PANIC); 539 set_opt (opts->s_mount_opt, ERRORS_CONT); 540 break; 541 case Opt_nouid32: 542 set_opt (opts->s_mount_opt, NO_UID32); 543 break; 544 case Opt_debug: 545 set_opt (opts->s_mount_opt, DEBUG); 546 break; 547 case Opt_oldalloc: 548 set_opt (opts->s_mount_opt, OLDALLOC); 549 break; 550 case Opt_orlov: 551 clear_opt (opts->s_mount_opt, OLDALLOC); 552 break; 553 case Opt_nobh: 554 set_opt (opts->s_mount_opt, NOBH); 555 break; 556 #ifdef CONFIG_EXT2_FS_XATTR 557 case Opt_user_xattr: 558 set_opt (opts->s_mount_opt, XATTR_USER); 559 break; 560 case Opt_nouser_xattr: 561 clear_opt (opts->s_mount_opt, XATTR_USER); 562 break; 563 #else 564 case Opt_user_xattr: 565 case Opt_nouser_xattr: 566 ext2_msg(sb, KERN_INFO, "(no)user_xattr options" 567 "not supported"); 568 break; 569 #endif 570 #ifdef CONFIG_EXT2_FS_POSIX_ACL 571 case Opt_acl: 572 set_opt(opts->s_mount_opt, POSIX_ACL); 573 break; 574 case Opt_noacl: 575 clear_opt(opts->s_mount_opt, POSIX_ACL); 576 break; 577 #else 578 case Opt_acl: 579 case Opt_noacl: 580 ext2_msg(sb, KERN_INFO, 581 "(no)acl options not supported"); 582 break; 583 #endif 584 case Opt_xip: 585 ext2_msg(sb, KERN_INFO, "use dax instead of xip"); 586 set_opt(opts->s_mount_opt, XIP); 587 fallthrough; 588 case Opt_dax: 589 #ifdef CONFIG_FS_DAX 590 ext2_msg(sb, KERN_WARNING, 591 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); 592 set_opt(opts->s_mount_opt, DAX); 593 #else 594 ext2_msg(sb, KERN_INFO, "dax option not supported"); 595 #endif 596 break; 597 598 #if defined(CONFIG_QUOTA) 599 case Opt_quota: 600 case Opt_usrquota: 601 set_opt(opts->s_mount_opt, USRQUOTA); 602 break; 603 604 case Opt_grpquota: 605 set_opt(opts->s_mount_opt, GRPQUOTA); 606 break; 607 #else 608 case Opt_quota: 609 case Opt_usrquota: 610 case Opt_grpquota: 611 ext2_msg(sb, KERN_INFO, 612 "quota operations not supported"); 613 break; 614 #endif 615 616 case Opt_reservation: 617 set_opt(opts->s_mount_opt, RESERVATION); 618 ext2_msg(sb, KERN_INFO, "reservations ON"); 619 break; 620 case Opt_noreservation: 621 clear_opt(opts->s_mount_opt, RESERVATION); 622 ext2_msg(sb, KERN_INFO, "reservations OFF"); 623 break; 624 case Opt_ignore: 625 break; 626 default: 627 return 0; 628 } 629 } 630 return 1; 631 } 632 633 static int ext2_setup_super (struct super_block * sb, 634 struct ext2_super_block * es, 635 int read_only) 636 { 637 int res = 0; 638 struct ext2_sb_info *sbi = EXT2_SB(sb); 639 640 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { 641 ext2_msg(sb, KERN_ERR, 642 "error: revision level too high, " 643 "forcing read-only mode"); 644 res = SB_RDONLY; 645 } 646 if (read_only) 647 return res; 648 if (!(sbi->s_mount_state & EXT2_VALID_FS)) 649 ext2_msg(sb, KERN_WARNING, 650 "warning: mounting unchecked fs, " 651 "running e2fsck is recommended"); 652 else if ((sbi->s_mount_state & EXT2_ERROR_FS)) 653 ext2_msg(sb, KERN_WARNING, 654 "warning: mounting fs with errors, " 655 "running e2fsck is recommended"); 656 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 657 le16_to_cpu(es->s_mnt_count) >= 658 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 659 ext2_msg(sb, KERN_WARNING, 660 "warning: maximal mount count reached, " 661 "running e2fsck is recommended"); 662 else if (le32_to_cpu(es->s_checkinterval) && 663 (le32_to_cpu(es->s_lastcheck) + 664 le32_to_cpu(es->s_checkinterval) <= 665 ktime_get_real_seconds())) 666 ext2_msg(sb, KERN_WARNING, 667 "warning: checktime reached, " 668 "running e2fsck is recommended"); 669 if (!le16_to_cpu(es->s_max_mnt_count)) 670 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); 671 le16_add_cpu(&es->s_mnt_count, 1); 672 if (test_opt (sb, DEBUG)) 673 ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, " 674 "bpg=%lu, ipg=%lu, mo=%04lx]", 675 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, 676 sbi->s_frag_size, 677 sbi->s_groups_count, 678 EXT2_BLOCKS_PER_GROUP(sb), 679 EXT2_INODES_PER_GROUP(sb), 680 sbi->s_mount_opt); 681 return res; 682 } 683 684 static int ext2_check_descriptors(struct super_block *sb) 685 { 686 int i; 687 struct ext2_sb_info *sbi = EXT2_SB(sb); 688 689 ext2_debug ("Checking group descriptors"); 690 691 for (i = 0; i < sbi->s_groups_count; i++) { 692 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL); 693 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i); 694 ext2_fsblk_t last_block = ext2_group_last_block_no(sb, i); 695 696 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || 697 le32_to_cpu(gdp->bg_block_bitmap) > last_block) 698 { 699 ext2_error (sb, "ext2_check_descriptors", 700 "Block bitmap for group %d" 701 " not in group (block %lu)!", 702 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); 703 return 0; 704 } 705 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || 706 le32_to_cpu(gdp->bg_inode_bitmap) > last_block) 707 { 708 ext2_error (sb, "ext2_check_descriptors", 709 "Inode bitmap for group %d" 710 " not in group (block %lu)!", 711 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); 712 return 0; 713 } 714 if (le32_to_cpu(gdp->bg_inode_table) < first_block || 715 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > 716 last_block) 717 { 718 ext2_error (sb, "ext2_check_descriptors", 719 "Inode table for group %d" 720 " not in group (block %lu)!", 721 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); 722 return 0; 723 } 724 } 725 return 1; 726 } 727 728 /* 729 * Maximal file size. There is a direct, and {,double-,triple-}indirect 730 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. 731 * We need to be 1 filesystem block less than the 2^32 sector limit. 732 */ 733 static loff_t ext2_max_size(int bits) 734 { 735 loff_t res = EXT2_NDIR_BLOCKS; 736 int meta_blocks; 737 unsigned int upper_limit; 738 unsigned int ppb = 1 << (bits-2); 739 740 /* This is calculated to be the largest file size for a 741 * dense, file such that the total number of 742 * sectors in the file, including data and all indirect blocks, 743 * does not exceed 2^32 -1 744 * __u32 i_blocks representing the total number of 745 * 512 bytes blocks of the file 746 */ 747 upper_limit = (1LL << 32) - 1; 748 749 /* total blocks in file system block size */ 750 upper_limit >>= (bits - 9); 751 752 /* Compute how many blocks we can address by block tree */ 753 res += 1LL << (bits-2); 754 res += 1LL << (2*(bits-2)); 755 res += 1LL << (3*(bits-2)); 756 /* Does block tree limit file size? */ 757 if (res < upper_limit) 758 goto check_lfs; 759 760 res = upper_limit; 761 /* How many metadata blocks are needed for addressing upper_limit? */ 762 upper_limit -= EXT2_NDIR_BLOCKS; 763 /* indirect blocks */ 764 meta_blocks = 1; 765 upper_limit -= ppb; 766 /* double indirect blocks */ 767 if (upper_limit < ppb * ppb) { 768 meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb); 769 res -= meta_blocks; 770 goto check_lfs; 771 } 772 meta_blocks += 1 + ppb; 773 upper_limit -= ppb * ppb; 774 /* tripple indirect blocks for the rest */ 775 meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb) + 776 DIV_ROUND_UP(upper_limit, ppb*ppb); 777 res -= meta_blocks; 778 check_lfs: 779 res <<= bits; 780 if (res > MAX_LFS_FILESIZE) 781 res = MAX_LFS_FILESIZE; 782 783 return res; 784 } 785 786 static unsigned long descriptor_loc(struct super_block *sb, 787 unsigned long logic_sb_block, 788 int nr) 789 { 790 struct ext2_sb_info *sbi = EXT2_SB(sb); 791 unsigned long bg, first_meta_bg; 792 793 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 794 795 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || 796 nr < first_meta_bg) 797 return (logic_sb_block + nr + 1); 798 bg = sbi->s_desc_per_block * nr; 799 800 return ext2_group_first_block_no(sb, bg) + ext2_bg_has_super(sb, bg); 801 } 802 803 static int ext2_fill_super(struct super_block *sb, void *data, int silent) 804 { 805 struct buffer_head * bh; 806 struct ext2_sb_info * sbi; 807 struct ext2_super_block * es; 808 struct inode *root; 809 unsigned long block; 810 unsigned long sb_block = get_sb_block(&data); 811 unsigned long logic_sb_block; 812 unsigned long offset = 0; 813 unsigned long def_mount_opts; 814 long ret = -ENOMEM; 815 int blocksize = BLOCK_SIZE; 816 int db_count; 817 int i, j; 818 __le32 features; 819 int err; 820 struct ext2_mount_options opts; 821 822 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 823 if (!sbi) 824 return -ENOMEM; 825 826 sbi->s_blockgroup_lock = 827 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); 828 if (!sbi->s_blockgroup_lock) { 829 kfree(sbi); 830 return -ENOMEM; 831 } 832 sb->s_fs_info = sbi; 833 sbi->s_sb_block = sb_block; 834 sbi->s_daxdev = fs_dax_get_by_bdev(sb->s_bdev, &sbi->s_dax_part_off); 835 836 spin_lock_init(&sbi->s_lock); 837 ret = -EINVAL; 838 839 /* 840 * See what the current blocksize for the device is, and 841 * use that as the blocksize. Otherwise (or if the blocksize 842 * is smaller than the default) use the default. 843 * This is important for devices that have a hardware 844 * sectorsize that is larger than the default. 845 */ 846 blocksize = sb_min_blocksize(sb, BLOCK_SIZE); 847 if (!blocksize) { 848 ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); 849 goto failed_sbi; 850 } 851 852 /* 853 * If the superblock doesn't start on a hardware sector boundary, 854 * calculate the offset. 855 */ 856 if (blocksize != BLOCK_SIZE) { 857 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 858 offset = (sb_block*BLOCK_SIZE) % blocksize; 859 } else { 860 logic_sb_block = sb_block; 861 } 862 863 if (!(bh = sb_bread(sb, logic_sb_block))) { 864 ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); 865 goto failed_sbi; 866 } 867 /* 868 * Note: s_es must be initialized as soon as possible because 869 * some ext2 macro-instructions depend on its value 870 */ 871 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 872 sbi->s_es = es; 873 sb->s_magic = le16_to_cpu(es->s_magic); 874 875 if (sb->s_magic != EXT2_SUPER_MAGIC) 876 goto cantfind_ext2; 877 878 opts.s_mount_opt = 0; 879 /* Set defaults before we parse the mount options */ 880 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 881 if (def_mount_opts & EXT2_DEFM_DEBUG) 882 set_opt(opts.s_mount_opt, DEBUG); 883 if (def_mount_opts & EXT2_DEFM_BSDGROUPS) 884 set_opt(opts.s_mount_opt, GRPID); 885 if (def_mount_opts & EXT2_DEFM_UID16) 886 set_opt(opts.s_mount_opt, NO_UID32); 887 #ifdef CONFIG_EXT2_FS_XATTR 888 if (def_mount_opts & EXT2_DEFM_XATTR_USER) 889 set_opt(opts.s_mount_opt, XATTR_USER); 890 #endif 891 #ifdef CONFIG_EXT2_FS_POSIX_ACL 892 if (def_mount_opts & EXT2_DEFM_ACL) 893 set_opt(opts.s_mount_opt, POSIX_ACL); 894 #endif 895 896 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) 897 set_opt(opts.s_mount_opt, ERRORS_PANIC); 898 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) 899 set_opt(opts.s_mount_opt, ERRORS_CONT); 900 else 901 set_opt(opts.s_mount_opt, ERRORS_RO); 902 903 opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); 904 opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); 905 906 set_opt(opts.s_mount_opt, RESERVATION); 907 908 if (!parse_options((char *) data, sb, &opts)) 909 goto failed_mount; 910 911 sbi->s_mount_opt = opts.s_mount_opt; 912 sbi->s_resuid = opts.s_resuid; 913 sbi->s_resgid = opts.s_resgid; 914 915 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | 916 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0); 917 sb->s_iflags |= SB_I_CGROUPWB; 918 919 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && 920 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || 921 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 922 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) 923 ext2_msg(sb, KERN_WARNING, 924 "warning: feature flags set on rev 0 fs, " 925 "running e2fsck is recommended"); 926 /* 927 * Check feature flags regardless of the revision level, since we 928 * previously didn't change the revision level when setting the flags, 929 * so there is a chance incompat flags are set on a rev 0 filesystem. 930 */ 931 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); 932 if (features) { 933 ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " 934 "unsupported optional features (%x)", 935 le32_to_cpu(features)); 936 goto failed_mount; 937 } 938 if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ 939 ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " 940 "unsupported optional features (%x)", 941 le32_to_cpu(features)); 942 goto failed_mount; 943 } 944 945 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); 946 947 if (test_opt(sb, DAX)) { 948 if (!sbi->s_daxdev) { 949 ext2_msg(sb, KERN_ERR, 950 "DAX unsupported by block device. Turning off DAX."); 951 clear_opt(sbi->s_mount_opt, DAX); 952 } else if (blocksize != PAGE_SIZE) { 953 ext2_msg(sb, KERN_ERR, "unsupported blocksize for DAX\n"); 954 clear_opt(sbi->s_mount_opt, DAX); 955 } 956 } 957 958 /* If the blocksize doesn't match, re-read the thing.. */ 959 if (sb->s_blocksize != blocksize) { 960 brelse(bh); 961 962 if (!sb_set_blocksize(sb, blocksize)) { 963 ext2_msg(sb, KERN_ERR, 964 "error: bad blocksize %d", blocksize); 965 goto failed_sbi; 966 } 967 968 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 969 offset = (sb_block*BLOCK_SIZE) % blocksize; 970 bh = sb_bread(sb, logic_sb_block); 971 if(!bh) { 972 ext2_msg(sb, KERN_ERR, "error: couldn't read" 973 "superblock on 2nd try"); 974 goto failed_sbi; 975 } 976 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 977 sbi->s_es = es; 978 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { 979 ext2_msg(sb, KERN_ERR, "error: magic mismatch"); 980 goto failed_mount; 981 } 982 } 983 984 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); 985 sb->s_max_links = EXT2_LINK_MAX; 986 sb->s_time_min = S32_MIN; 987 sb->s_time_max = S32_MAX; 988 989 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { 990 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; 991 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; 992 } else { 993 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 994 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 995 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || 996 !is_power_of_2(sbi->s_inode_size) || 997 (sbi->s_inode_size > blocksize)) { 998 ext2_msg(sb, KERN_ERR, 999 "error: unsupported inode size: %d", 1000 sbi->s_inode_size); 1001 goto failed_mount; 1002 } 1003 } 1004 1005 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << 1006 le32_to_cpu(es->s_log_frag_size); 1007 if (sbi->s_frag_size == 0) 1008 goto cantfind_ext2; 1009 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; 1010 1011 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 1012 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); 1013 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 1014 1015 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); 1016 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) 1017 goto cantfind_ext2; 1018 sbi->s_itb_per_group = sbi->s_inodes_per_group / 1019 sbi->s_inodes_per_block; 1020 sbi->s_desc_per_block = sb->s_blocksize / 1021 sizeof (struct ext2_group_desc); 1022 sbi->s_sbh = bh; 1023 sbi->s_mount_state = le16_to_cpu(es->s_state); 1024 sbi->s_addr_per_block_bits = 1025 ilog2 (EXT2_ADDR_PER_BLOCK(sb)); 1026 sbi->s_desc_per_block_bits = 1027 ilog2 (EXT2_DESC_PER_BLOCK(sb)); 1028 1029 if (sb->s_magic != EXT2_SUPER_MAGIC) 1030 goto cantfind_ext2; 1031 1032 if (sb->s_blocksize != bh->b_size) { 1033 if (!silent) 1034 ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); 1035 goto failed_mount; 1036 } 1037 1038 if (sb->s_blocksize != sbi->s_frag_size) { 1039 ext2_msg(sb, KERN_ERR, 1040 "error: fragsize %lu != blocksize %lu" 1041 "(not supported yet)", 1042 sbi->s_frag_size, sb->s_blocksize); 1043 goto failed_mount; 1044 } 1045 1046 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { 1047 ext2_msg(sb, KERN_ERR, 1048 "error: #blocks per group too big: %lu", 1049 sbi->s_blocks_per_group); 1050 goto failed_mount; 1051 } 1052 if (sbi->s_frags_per_group > sb->s_blocksize * 8) { 1053 ext2_msg(sb, KERN_ERR, 1054 "error: #fragments per group too big: %lu", 1055 sbi->s_frags_per_group); 1056 goto failed_mount; 1057 } 1058 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { 1059 ext2_msg(sb, KERN_ERR, 1060 "error: #inodes per group too big: %lu", 1061 sbi->s_inodes_per_group); 1062 goto failed_mount; 1063 } 1064 1065 if (EXT2_BLOCKS_PER_GROUP(sb) == 0) 1066 goto cantfind_ext2; 1067 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - 1068 le32_to_cpu(es->s_first_data_block) - 1) 1069 / EXT2_BLOCKS_PER_GROUP(sb)) + 1; 1070 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / 1071 EXT2_DESC_PER_BLOCK(sb); 1072 sbi->s_group_desc = kmalloc_array(db_count, 1073 sizeof(struct buffer_head *), 1074 GFP_KERNEL); 1075 if (sbi->s_group_desc == NULL) { 1076 ret = -ENOMEM; 1077 ext2_msg(sb, KERN_ERR, "error: not enough memory"); 1078 goto failed_mount; 1079 } 1080 bgl_lock_init(sbi->s_blockgroup_lock); 1081 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); 1082 if (!sbi->s_debts) { 1083 ret = -ENOMEM; 1084 ext2_msg(sb, KERN_ERR, "error: not enough memory"); 1085 goto failed_mount_group_desc; 1086 } 1087 for (i = 0; i < db_count; i++) { 1088 block = descriptor_loc(sb, logic_sb_block, i); 1089 sbi->s_group_desc[i] = sb_bread(sb, block); 1090 if (!sbi->s_group_desc[i]) { 1091 for (j = 0; j < i; j++) 1092 brelse (sbi->s_group_desc[j]); 1093 ext2_msg(sb, KERN_ERR, 1094 "error: unable to read group descriptors"); 1095 goto failed_mount_group_desc; 1096 } 1097 } 1098 if (!ext2_check_descriptors (sb)) { 1099 ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); 1100 goto failed_mount2; 1101 } 1102 sbi->s_gdb_count = db_count; 1103 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 1104 spin_lock_init(&sbi->s_next_gen_lock); 1105 1106 /* per filesystem reservation list head & lock */ 1107 spin_lock_init(&sbi->s_rsv_window_lock); 1108 sbi->s_rsv_window_root = RB_ROOT; 1109 /* 1110 * Add a single, static dummy reservation to the start of the 1111 * reservation window list --- it gives us a placeholder for 1112 * append-at-start-of-list which makes the allocation logic 1113 * _much_ simpler. 1114 */ 1115 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; 1116 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; 1117 sbi->s_rsv_window_head.rsv_alloc_hit = 0; 1118 sbi->s_rsv_window_head.rsv_goal_size = 0; 1119 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); 1120 1121 err = percpu_counter_init(&sbi->s_freeblocks_counter, 1122 ext2_count_free_blocks(sb), GFP_KERNEL); 1123 if (!err) { 1124 err = percpu_counter_init(&sbi->s_freeinodes_counter, 1125 ext2_count_free_inodes(sb), GFP_KERNEL); 1126 } 1127 if (!err) { 1128 err = percpu_counter_init(&sbi->s_dirs_counter, 1129 ext2_count_dirs(sb), GFP_KERNEL); 1130 } 1131 if (err) { 1132 ret = err; 1133 ext2_msg(sb, KERN_ERR, "error: insufficient memory"); 1134 goto failed_mount3; 1135 } 1136 1137 #ifdef CONFIG_EXT2_FS_XATTR 1138 sbi->s_ea_block_cache = ext2_xattr_create_cache(); 1139 if (!sbi->s_ea_block_cache) { 1140 ret = -ENOMEM; 1141 ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache"); 1142 goto failed_mount3; 1143 } 1144 #endif 1145 /* 1146 * set up enough so that it can read an inode 1147 */ 1148 sb->s_op = &ext2_sops; 1149 sb->s_export_op = &ext2_export_ops; 1150 sb->s_xattr = ext2_xattr_handlers; 1151 1152 #ifdef CONFIG_QUOTA 1153 sb->dq_op = &dquot_operations; 1154 sb->s_qcop = &ext2_quotactl_ops; 1155 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1156 #endif 1157 1158 root = ext2_iget(sb, EXT2_ROOT_INO); 1159 if (IS_ERR(root)) { 1160 ret = PTR_ERR(root); 1161 goto failed_mount3; 1162 } 1163 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 1164 iput(root); 1165 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); 1166 goto failed_mount3; 1167 } 1168 1169 sb->s_root = d_make_root(root); 1170 if (!sb->s_root) { 1171 ext2_msg(sb, KERN_ERR, "error: get root inode failed"); 1172 ret = -ENOMEM; 1173 goto failed_mount3; 1174 } 1175 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 1176 ext2_msg(sb, KERN_WARNING, 1177 "warning: mounting ext3 filesystem as ext2"); 1178 if (ext2_setup_super (sb, es, sb_rdonly(sb))) 1179 sb->s_flags |= SB_RDONLY; 1180 ext2_write_super(sb); 1181 return 0; 1182 1183 cantfind_ext2: 1184 if (!silent) 1185 ext2_msg(sb, KERN_ERR, 1186 "error: can't find an ext2 filesystem on dev %s.", 1187 sb->s_id); 1188 goto failed_mount; 1189 failed_mount3: 1190 ext2_xattr_destroy_cache(sbi->s_ea_block_cache); 1191 percpu_counter_destroy(&sbi->s_freeblocks_counter); 1192 percpu_counter_destroy(&sbi->s_freeinodes_counter); 1193 percpu_counter_destroy(&sbi->s_dirs_counter); 1194 failed_mount2: 1195 for (i = 0; i < db_count; i++) 1196 brelse(sbi->s_group_desc[i]); 1197 failed_mount_group_desc: 1198 kfree(sbi->s_group_desc); 1199 kfree(sbi->s_debts); 1200 failed_mount: 1201 brelse(bh); 1202 failed_sbi: 1203 fs_put_dax(sbi->s_daxdev); 1204 sb->s_fs_info = NULL; 1205 kfree(sbi->s_blockgroup_lock); 1206 kfree(sbi); 1207 return ret; 1208 } 1209 1210 static void ext2_clear_super_error(struct super_block *sb) 1211 { 1212 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; 1213 1214 if (buffer_write_io_error(sbh)) { 1215 /* 1216 * Oh, dear. A previous attempt to write the 1217 * superblock failed. This could happen because the 1218 * USB device was yanked out. Or it could happen to 1219 * be a transient write error and maybe the block will 1220 * be remapped. Nothing we can do but to retry the 1221 * write and hope for the best. 1222 */ 1223 ext2_msg(sb, KERN_ERR, 1224 "previous I/O error to superblock detected"); 1225 clear_buffer_write_io_error(sbh); 1226 set_buffer_uptodate(sbh); 1227 } 1228 } 1229 1230 void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, 1231 int wait) 1232 { 1233 ext2_clear_super_error(sb); 1234 spin_lock(&EXT2_SB(sb)->s_lock); 1235 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); 1236 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); 1237 es->s_wtime = cpu_to_le32(ktime_get_real_seconds()); 1238 /* unlock before we do IO */ 1239 spin_unlock(&EXT2_SB(sb)->s_lock); 1240 mark_buffer_dirty(EXT2_SB(sb)->s_sbh); 1241 if (wait) 1242 sync_dirty_buffer(EXT2_SB(sb)->s_sbh); 1243 } 1244 1245 /* 1246 * In the second extended file system, it is not necessary to 1247 * write the super block since we use a mapping of the 1248 * disk super block in a buffer. 1249 * 1250 * However, this function is still used to set the fs valid 1251 * flags to 0. We need to set this flag to 0 since the fs 1252 * may have been checked while mounted and e2fsck may have 1253 * set s_state to EXT2_VALID_FS after some corrections. 1254 */ 1255 static int ext2_sync_fs(struct super_block *sb, int wait) 1256 { 1257 struct ext2_sb_info *sbi = EXT2_SB(sb); 1258 struct ext2_super_block *es = EXT2_SB(sb)->s_es; 1259 1260 /* 1261 * Write quota structures to quota file, sync_blockdev() will write 1262 * them to disk later 1263 */ 1264 dquot_writeback_dquots(sb, -1); 1265 1266 spin_lock(&sbi->s_lock); 1267 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { 1268 ext2_debug("setting valid to 0\n"); 1269 es->s_state &= cpu_to_le16(~EXT2_VALID_FS); 1270 } 1271 spin_unlock(&sbi->s_lock); 1272 ext2_sync_super(sb, es, wait); 1273 return 0; 1274 } 1275 1276 static int ext2_freeze(struct super_block *sb) 1277 { 1278 struct ext2_sb_info *sbi = EXT2_SB(sb); 1279 1280 /* 1281 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared 1282 * because we have unattached inodes and thus filesystem is not fully 1283 * consistent. 1284 */ 1285 if (atomic_long_read(&sb->s_remove_count)) { 1286 ext2_sync_fs(sb, 1); 1287 return 0; 1288 } 1289 /* Set EXT2_FS_VALID flag */ 1290 spin_lock(&sbi->s_lock); 1291 sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state); 1292 spin_unlock(&sbi->s_lock); 1293 ext2_sync_super(sb, sbi->s_es, 1); 1294 1295 return 0; 1296 } 1297 1298 static int ext2_unfreeze(struct super_block *sb) 1299 { 1300 /* Just write sb to clear EXT2_VALID_FS flag */ 1301 ext2_write_super(sb); 1302 1303 return 0; 1304 } 1305 1306 static void ext2_write_super(struct super_block *sb) 1307 { 1308 if (!sb_rdonly(sb)) 1309 ext2_sync_fs(sb, 1); 1310 } 1311 1312 static int ext2_remount (struct super_block * sb, int * flags, char * data) 1313 { 1314 struct ext2_sb_info * sbi = EXT2_SB(sb); 1315 struct ext2_super_block * es; 1316 struct ext2_mount_options new_opts; 1317 int err; 1318 1319 sync_filesystem(sb); 1320 1321 spin_lock(&sbi->s_lock); 1322 new_opts.s_mount_opt = sbi->s_mount_opt; 1323 new_opts.s_resuid = sbi->s_resuid; 1324 new_opts.s_resgid = sbi->s_resgid; 1325 spin_unlock(&sbi->s_lock); 1326 1327 if (!parse_options(data, sb, &new_opts)) 1328 return -EINVAL; 1329 1330 spin_lock(&sbi->s_lock); 1331 es = sbi->s_es; 1332 if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) { 1333 ext2_msg(sb, KERN_WARNING, "warning: refusing change of " 1334 "dax flag with busy inodes while remounting"); 1335 new_opts.s_mount_opt ^= EXT2_MOUNT_DAX; 1336 } 1337 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) 1338 goto out_set; 1339 if (*flags & SB_RDONLY) { 1340 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || 1341 !(sbi->s_mount_state & EXT2_VALID_FS)) 1342 goto out_set; 1343 1344 /* 1345 * OK, we are remounting a valid rw partition rdonly, so set 1346 * the rdonly flag and then mark the partition as valid again. 1347 */ 1348 es->s_state = cpu_to_le16(sbi->s_mount_state); 1349 es->s_mtime = cpu_to_le32(ktime_get_real_seconds()); 1350 spin_unlock(&sbi->s_lock); 1351 1352 err = dquot_suspend(sb, -1); 1353 if (err < 0) 1354 return err; 1355 1356 ext2_sync_super(sb, es, 1); 1357 } else { 1358 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, 1359 ~EXT2_FEATURE_RO_COMPAT_SUPP); 1360 if (ret) { 1361 spin_unlock(&sbi->s_lock); 1362 ext2_msg(sb, KERN_WARNING, 1363 "warning: couldn't remount RDWR because of " 1364 "unsupported optional features (%x).", 1365 le32_to_cpu(ret)); 1366 return -EROFS; 1367 } 1368 /* 1369 * Mounting a RDONLY partition read-write, so reread and 1370 * store the current valid flag. (It may have been changed 1371 * by e2fsck since we originally mounted the partition.) 1372 */ 1373 sbi->s_mount_state = le16_to_cpu(es->s_state); 1374 if (!ext2_setup_super (sb, es, 0)) 1375 sb->s_flags &= ~SB_RDONLY; 1376 spin_unlock(&sbi->s_lock); 1377 1378 ext2_write_super(sb); 1379 1380 dquot_resume(sb, -1); 1381 } 1382 1383 spin_lock(&sbi->s_lock); 1384 out_set: 1385 sbi->s_mount_opt = new_opts.s_mount_opt; 1386 sbi->s_resuid = new_opts.s_resuid; 1387 sbi->s_resgid = new_opts.s_resgid; 1388 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | 1389 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0); 1390 spin_unlock(&sbi->s_lock); 1391 1392 return 0; 1393 } 1394 1395 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) 1396 { 1397 struct super_block *sb = dentry->d_sb; 1398 struct ext2_sb_info *sbi = EXT2_SB(sb); 1399 struct ext2_super_block *es = sbi->s_es; 1400 1401 spin_lock(&sbi->s_lock); 1402 1403 if (test_opt (sb, MINIX_DF)) 1404 sbi->s_overhead_last = 0; 1405 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { 1406 unsigned long i, overhead = 0; 1407 smp_rmb(); 1408 1409 /* 1410 * Compute the overhead (FS structures). This is constant 1411 * for a given filesystem unless the number of block groups 1412 * changes so we cache the previous value until it does. 1413 */ 1414 1415 /* 1416 * All of the blocks before first_data_block are 1417 * overhead 1418 */ 1419 overhead = le32_to_cpu(es->s_first_data_block); 1420 1421 /* 1422 * Add the overhead attributed to the superblock and 1423 * block group descriptors. If the sparse superblocks 1424 * feature is turned on, then not all groups have this. 1425 */ 1426 for (i = 0; i < sbi->s_groups_count; i++) 1427 overhead += ext2_bg_has_super(sb, i) + 1428 ext2_bg_num_gdb(sb, i); 1429 1430 /* 1431 * Every block group has an inode bitmap, a block 1432 * bitmap, and an inode table. 1433 */ 1434 overhead += (sbi->s_groups_count * 1435 (2 + sbi->s_itb_per_group)); 1436 sbi->s_overhead_last = overhead; 1437 smp_wmb(); 1438 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); 1439 } 1440 1441 buf->f_type = EXT2_SUPER_MAGIC; 1442 buf->f_bsize = sb->s_blocksize; 1443 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; 1444 buf->f_bfree = ext2_count_free_blocks(sb); 1445 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); 1446 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); 1447 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) 1448 buf->f_bavail = 0; 1449 buf->f_files = le32_to_cpu(es->s_inodes_count); 1450 buf->f_ffree = ext2_count_free_inodes(sb); 1451 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); 1452 buf->f_namelen = EXT2_NAME_LEN; 1453 buf->f_fsid = uuid_to_fsid(es->s_uuid); 1454 spin_unlock(&sbi->s_lock); 1455 return 0; 1456 } 1457 1458 static struct dentry *ext2_mount(struct file_system_type *fs_type, 1459 int flags, const char *dev_name, void *data) 1460 { 1461 return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super); 1462 } 1463 1464 #ifdef CONFIG_QUOTA 1465 1466 /* Read data from quotafile - avoid pagecache and such because we cannot afford 1467 * acquiring the locks... As quota files are never truncated and quota code 1468 * itself serializes the operations (and no one else should touch the files) 1469 * we don't have to be afraid of races */ 1470 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, 1471 size_t len, loff_t off) 1472 { 1473 struct inode *inode = sb_dqopt(sb)->files[type]; 1474 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1475 int err = 0; 1476 int offset = off & (sb->s_blocksize - 1); 1477 int tocopy; 1478 size_t toread; 1479 struct buffer_head tmp_bh; 1480 struct buffer_head *bh; 1481 loff_t i_size = i_size_read(inode); 1482 1483 if (off > i_size) 1484 return 0; 1485 if (off+len > i_size) 1486 len = i_size-off; 1487 toread = len; 1488 while (toread > 0) { 1489 tocopy = sb->s_blocksize - offset < toread ? 1490 sb->s_blocksize - offset : toread; 1491 1492 tmp_bh.b_state = 0; 1493 tmp_bh.b_size = sb->s_blocksize; 1494 err = ext2_get_block(inode, blk, &tmp_bh, 0); 1495 if (err < 0) 1496 return err; 1497 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 1498 memset(data, 0, tocopy); 1499 else { 1500 bh = sb_bread(sb, tmp_bh.b_blocknr); 1501 if (!bh) 1502 return -EIO; 1503 memcpy(data, bh->b_data+offset, tocopy); 1504 brelse(bh); 1505 } 1506 offset = 0; 1507 toread -= tocopy; 1508 data += tocopy; 1509 blk++; 1510 } 1511 return len; 1512 } 1513 1514 /* Write to quotafile */ 1515 static ssize_t ext2_quota_write(struct super_block *sb, int type, 1516 const char *data, size_t len, loff_t off) 1517 { 1518 struct inode *inode = sb_dqopt(sb)->files[type]; 1519 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1520 int err = 0; 1521 int offset = off & (sb->s_blocksize - 1); 1522 int tocopy; 1523 size_t towrite = len; 1524 struct buffer_head tmp_bh; 1525 struct buffer_head *bh; 1526 1527 while (towrite > 0) { 1528 tocopy = sb->s_blocksize - offset < towrite ? 1529 sb->s_blocksize - offset : towrite; 1530 1531 tmp_bh.b_state = 0; 1532 tmp_bh.b_size = sb->s_blocksize; 1533 err = ext2_get_block(inode, blk, &tmp_bh, 1); 1534 if (err < 0) 1535 goto out; 1536 if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) 1537 bh = sb_bread(sb, tmp_bh.b_blocknr); 1538 else 1539 bh = sb_getblk(sb, tmp_bh.b_blocknr); 1540 if (unlikely(!bh)) { 1541 err = -EIO; 1542 goto out; 1543 } 1544 lock_buffer(bh); 1545 memcpy(bh->b_data+offset, data, tocopy); 1546 flush_dcache_page(bh->b_page); 1547 set_buffer_uptodate(bh); 1548 mark_buffer_dirty(bh); 1549 unlock_buffer(bh); 1550 brelse(bh); 1551 offset = 0; 1552 towrite -= tocopy; 1553 data += tocopy; 1554 blk++; 1555 } 1556 out: 1557 if (len == towrite) 1558 return err; 1559 if (inode->i_size < off+len-towrite) 1560 i_size_write(inode, off+len-towrite); 1561 inode_inc_iversion(inode); 1562 inode->i_mtime = inode->i_ctime = current_time(inode); 1563 mark_inode_dirty(inode); 1564 return len - towrite; 1565 } 1566 1567 static int ext2_quota_on(struct super_block *sb, int type, int format_id, 1568 const struct path *path) 1569 { 1570 int err; 1571 struct inode *inode; 1572 1573 err = dquot_quota_on(sb, type, format_id, path); 1574 if (err) 1575 return err; 1576 1577 inode = d_inode(path->dentry); 1578 inode_lock(inode); 1579 EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL; 1580 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, 1581 S_NOATIME | S_IMMUTABLE); 1582 inode_unlock(inode); 1583 mark_inode_dirty(inode); 1584 1585 return 0; 1586 } 1587 1588 static int ext2_quota_off(struct super_block *sb, int type) 1589 { 1590 struct inode *inode = sb_dqopt(sb)->files[type]; 1591 int err; 1592 1593 if (!inode || !igrab(inode)) 1594 goto out; 1595 1596 err = dquot_quota_off(sb, type); 1597 if (err) 1598 goto out_put; 1599 1600 inode_lock(inode); 1601 EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL); 1602 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); 1603 inode_unlock(inode); 1604 mark_inode_dirty(inode); 1605 out_put: 1606 iput(inode); 1607 return err; 1608 out: 1609 return dquot_quota_off(sb, type); 1610 } 1611 1612 #endif 1613 1614 static struct file_system_type ext2_fs_type = { 1615 .owner = THIS_MODULE, 1616 .name = "ext2", 1617 .mount = ext2_mount, 1618 .kill_sb = kill_block_super, 1619 .fs_flags = FS_REQUIRES_DEV, 1620 }; 1621 MODULE_ALIAS_FS("ext2"); 1622 1623 static int __init init_ext2_fs(void) 1624 { 1625 int err; 1626 1627 err = init_inodecache(); 1628 if (err) 1629 return err; 1630 err = register_filesystem(&ext2_fs_type); 1631 if (err) 1632 goto out; 1633 return 0; 1634 out: 1635 destroy_inodecache(); 1636 return err; 1637 } 1638 1639 static void __exit exit_ext2_fs(void) 1640 { 1641 unregister_filesystem(&ext2_fs_type); 1642 destroy_inodecache(); 1643 } 1644 1645 MODULE_AUTHOR("Remy Card and others"); 1646 MODULE_DESCRIPTION("Second Extended Filesystem"); 1647 MODULE_LICENSE("GPL"); 1648 module_init(init_ext2_fs) 1649 module_exit(exit_ext2_fs) 1650