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 kvfree(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, NULL); 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 = alloc_inode_sb(sb, 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, USRQUOTA)) 300 seq_puts(seq, ",usrquota"); 301 302 if (test_opt(sb, GRPQUOTA)) 303 seq_puts(seq, ",grpquota"); 304 305 if (test_opt(sb, XIP)) 306 seq_puts(seq, ",xip"); 307 308 if (test_opt(sb, DAX)) 309 seq_puts(seq, ",dax"); 310 311 if (!test_opt(sb, RESERVATION)) 312 seq_puts(seq, ",noreservation"); 313 314 spin_unlock(&sbi->s_lock); 315 return 0; 316 } 317 318 #ifdef CONFIG_QUOTA 319 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); 320 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); 321 static int ext2_quota_on(struct super_block *sb, int type, int format_id, 322 const struct path *path); 323 static struct dquot **ext2_get_dquots(struct inode *inode) 324 { 325 return EXT2_I(inode)->i_dquot; 326 } 327 328 static const struct quotactl_ops ext2_quotactl_ops = { 329 .quota_on = ext2_quota_on, 330 .quota_off = ext2_quota_off, 331 .quota_sync = dquot_quota_sync, 332 .get_state = dquot_get_state, 333 .set_info = dquot_set_dqinfo, 334 .get_dqblk = dquot_get_dqblk, 335 .set_dqblk = dquot_set_dqblk, 336 .get_nextdqblk = dquot_get_next_dqblk, 337 }; 338 #endif 339 340 static const struct super_operations ext2_sops = { 341 .alloc_inode = ext2_alloc_inode, 342 .free_inode = ext2_free_in_core_inode, 343 .write_inode = ext2_write_inode, 344 .evict_inode = ext2_evict_inode, 345 .put_super = ext2_put_super, 346 .sync_fs = ext2_sync_fs, 347 .freeze_fs = ext2_freeze, 348 .unfreeze_fs = ext2_unfreeze, 349 .statfs = ext2_statfs, 350 .remount_fs = ext2_remount, 351 .show_options = ext2_show_options, 352 #ifdef CONFIG_QUOTA 353 .quota_read = ext2_quota_read, 354 .quota_write = ext2_quota_write, 355 .get_dquots = ext2_get_dquots, 356 #endif 357 }; 358 359 static struct inode *ext2_nfs_get_inode(struct super_block *sb, 360 u64 ino, u32 generation) 361 { 362 struct inode *inode; 363 364 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) 365 return ERR_PTR(-ESTALE); 366 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) 367 return ERR_PTR(-ESTALE); 368 369 /* 370 * ext2_iget isn't quite right if the inode is currently unallocated! 371 * However ext2_iget currently does appropriate checks to handle stale 372 * inodes so everything is OK. 373 */ 374 inode = ext2_iget(sb, ino); 375 if (IS_ERR(inode)) 376 return ERR_CAST(inode); 377 if (generation && inode->i_generation != generation) { 378 /* we didn't find the right inode.. */ 379 iput(inode); 380 return ERR_PTR(-ESTALE); 381 } 382 return inode; 383 } 384 385 static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid, 386 int fh_len, int fh_type) 387 { 388 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 389 ext2_nfs_get_inode); 390 } 391 392 static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid, 393 int fh_len, int fh_type) 394 { 395 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 396 ext2_nfs_get_inode); 397 } 398 399 static const struct export_operations ext2_export_ops = { 400 .fh_to_dentry = ext2_fh_to_dentry, 401 .fh_to_parent = ext2_fh_to_parent, 402 .get_parent = ext2_get_parent, 403 }; 404 405 static unsigned long get_sb_block(void **data) 406 { 407 unsigned long sb_block; 408 char *options = (char *) *data; 409 410 if (!options || strncmp(options, "sb=", 3) != 0) 411 return 1; /* Default location */ 412 options += 3; 413 sb_block = simple_strtoul(options, &options, 0); 414 if (*options && *options != ',') { 415 printk("EXT2-fs: Invalid sb specification: %s\n", 416 (char *) *data); 417 return 1; 418 } 419 if (*options == ',') 420 options++; 421 *data = (void *) options; 422 return sb_block; 423 } 424 425 enum { 426 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 427 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, 428 Opt_err_ro, Opt_nouid32, Opt_debug, 429 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, 430 Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota, 431 Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation 432 }; 433 434 static const match_table_t tokens = { 435 {Opt_bsd_df, "bsddf"}, 436 {Opt_minix_df, "minixdf"}, 437 {Opt_grpid, "grpid"}, 438 {Opt_grpid, "bsdgroups"}, 439 {Opt_nogrpid, "nogrpid"}, 440 {Opt_nogrpid, "sysvgroups"}, 441 {Opt_resgid, "resgid=%u"}, 442 {Opt_resuid, "resuid=%u"}, 443 {Opt_sb, "sb=%u"}, 444 {Opt_err_cont, "errors=continue"}, 445 {Opt_err_panic, "errors=panic"}, 446 {Opt_err_ro, "errors=remount-ro"}, 447 {Opt_nouid32, "nouid32"}, 448 {Opt_debug, "debug"}, 449 {Opt_oldalloc, "oldalloc"}, 450 {Opt_orlov, "orlov"}, 451 {Opt_nobh, "nobh"}, 452 {Opt_user_xattr, "user_xattr"}, 453 {Opt_nouser_xattr, "nouser_xattr"}, 454 {Opt_acl, "acl"}, 455 {Opt_noacl, "noacl"}, 456 {Opt_xip, "xip"}, 457 {Opt_dax, "dax"}, 458 {Opt_grpquota, "grpquota"}, 459 {Opt_ignore, "noquota"}, 460 {Opt_quota, "quota"}, 461 {Opt_usrquota, "usrquota"}, 462 {Opt_reservation, "reservation"}, 463 {Opt_noreservation, "noreservation"}, 464 {Opt_err, NULL} 465 }; 466 467 static int parse_options(char *options, struct super_block *sb, 468 struct ext2_mount_options *opts) 469 { 470 char *p; 471 substring_t args[MAX_OPT_ARGS]; 472 int option; 473 kuid_t uid; 474 kgid_t gid; 475 476 if (!options) 477 return 1; 478 479 while ((p = strsep (&options, ",")) != NULL) { 480 int token; 481 if (!*p) 482 continue; 483 484 token = match_token(p, tokens, args); 485 switch (token) { 486 case Opt_bsd_df: 487 clear_opt (opts->s_mount_opt, MINIX_DF); 488 break; 489 case Opt_minix_df: 490 set_opt (opts->s_mount_opt, MINIX_DF); 491 break; 492 case Opt_grpid: 493 set_opt (opts->s_mount_opt, GRPID); 494 break; 495 case Opt_nogrpid: 496 clear_opt (opts->s_mount_opt, GRPID); 497 break; 498 case Opt_resuid: 499 if (match_int(&args[0], &option)) 500 return 0; 501 uid = make_kuid(current_user_ns(), option); 502 if (!uid_valid(uid)) { 503 ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option); 504 return 0; 505 506 } 507 opts->s_resuid = uid; 508 break; 509 case Opt_resgid: 510 if (match_int(&args[0], &option)) 511 return 0; 512 gid = make_kgid(current_user_ns(), option); 513 if (!gid_valid(gid)) { 514 ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option); 515 return 0; 516 } 517 opts->s_resgid = gid; 518 break; 519 case Opt_sb: 520 /* handled by get_sb_block() instead of here */ 521 /* *sb_block = match_int(&args[0]); */ 522 break; 523 case Opt_err_panic: 524 clear_opt (opts->s_mount_opt, ERRORS_CONT); 525 clear_opt (opts->s_mount_opt, ERRORS_RO); 526 set_opt (opts->s_mount_opt, ERRORS_PANIC); 527 break; 528 case Opt_err_ro: 529 clear_opt (opts->s_mount_opt, ERRORS_CONT); 530 clear_opt (opts->s_mount_opt, ERRORS_PANIC); 531 set_opt (opts->s_mount_opt, ERRORS_RO); 532 break; 533 case Opt_err_cont: 534 clear_opt (opts->s_mount_opt, ERRORS_RO); 535 clear_opt (opts->s_mount_opt, ERRORS_PANIC); 536 set_opt (opts->s_mount_opt, ERRORS_CONT); 537 break; 538 case Opt_nouid32: 539 set_opt (opts->s_mount_opt, NO_UID32); 540 break; 541 case Opt_debug: 542 set_opt (opts->s_mount_opt, DEBUG); 543 break; 544 case Opt_oldalloc: 545 set_opt (opts->s_mount_opt, OLDALLOC); 546 break; 547 case Opt_orlov: 548 clear_opt (opts->s_mount_opt, OLDALLOC); 549 break; 550 case Opt_nobh: 551 ext2_msg(sb, KERN_INFO, 552 "nobh option not supported"); 553 break; 554 #ifdef CONFIG_EXT2_FS_XATTR 555 case Opt_user_xattr: 556 set_opt (opts->s_mount_opt, XATTR_USER); 557 break; 558 case Opt_nouser_xattr: 559 clear_opt (opts->s_mount_opt, XATTR_USER); 560 break; 561 #else 562 case Opt_user_xattr: 563 case Opt_nouser_xattr: 564 ext2_msg(sb, KERN_INFO, "(no)user_xattr options" 565 "not supported"); 566 break; 567 #endif 568 #ifdef CONFIG_EXT2_FS_POSIX_ACL 569 case Opt_acl: 570 set_opt(opts->s_mount_opt, POSIX_ACL); 571 break; 572 case Opt_noacl: 573 clear_opt(opts->s_mount_opt, POSIX_ACL); 574 break; 575 #else 576 case Opt_acl: 577 case Opt_noacl: 578 ext2_msg(sb, KERN_INFO, 579 "(no)acl options not supported"); 580 break; 581 #endif 582 case Opt_xip: 583 ext2_msg(sb, KERN_INFO, "use dax instead of xip"); 584 set_opt(opts->s_mount_opt, XIP); 585 fallthrough; 586 case Opt_dax: 587 #ifdef CONFIG_FS_DAX 588 ext2_msg(sb, KERN_WARNING, 589 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); 590 set_opt(opts->s_mount_opt, DAX); 591 #else 592 ext2_msg(sb, KERN_INFO, "dax option not supported"); 593 #endif 594 break; 595 596 #if defined(CONFIG_QUOTA) 597 case Opt_quota: 598 case Opt_usrquota: 599 set_opt(opts->s_mount_opt, USRQUOTA); 600 break; 601 602 case Opt_grpquota: 603 set_opt(opts->s_mount_opt, GRPQUOTA); 604 break; 605 #else 606 case Opt_quota: 607 case Opt_usrquota: 608 case Opt_grpquota: 609 ext2_msg(sb, KERN_INFO, 610 "quota operations not supported"); 611 break; 612 #endif 613 614 case Opt_reservation: 615 set_opt(opts->s_mount_opt, RESERVATION); 616 ext2_msg(sb, KERN_INFO, "reservations ON"); 617 break; 618 case Opt_noreservation: 619 clear_opt(opts->s_mount_opt, RESERVATION); 620 ext2_msg(sb, KERN_INFO, "reservations OFF"); 621 break; 622 case Opt_ignore: 623 break; 624 default: 625 return 0; 626 } 627 } 628 return 1; 629 } 630 631 static int ext2_setup_super (struct super_block * sb, 632 struct ext2_super_block * es, 633 int read_only) 634 { 635 int res = 0; 636 struct ext2_sb_info *sbi = EXT2_SB(sb); 637 638 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { 639 ext2_msg(sb, KERN_ERR, 640 "error: revision level too high, " 641 "forcing read-only mode"); 642 res = SB_RDONLY; 643 } 644 if (read_only) 645 return res; 646 if (!(sbi->s_mount_state & EXT2_VALID_FS)) 647 ext2_msg(sb, KERN_WARNING, 648 "warning: mounting unchecked fs, " 649 "running e2fsck is recommended"); 650 else if ((sbi->s_mount_state & EXT2_ERROR_FS)) 651 ext2_msg(sb, KERN_WARNING, 652 "warning: mounting fs with errors, " 653 "running e2fsck is recommended"); 654 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 655 le16_to_cpu(es->s_mnt_count) >= 656 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 657 ext2_msg(sb, KERN_WARNING, 658 "warning: maximal mount count reached, " 659 "running e2fsck is recommended"); 660 else if (le32_to_cpu(es->s_checkinterval) && 661 (le32_to_cpu(es->s_lastcheck) + 662 le32_to_cpu(es->s_checkinterval) <= 663 ktime_get_real_seconds())) 664 ext2_msg(sb, KERN_WARNING, 665 "warning: checktime reached, " 666 "running e2fsck is recommended"); 667 if (!le16_to_cpu(es->s_max_mnt_count)) 668 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); 669 le16_add_cpu(&es->s_mnt_count, 1); 670 if (test_opt (sb, DEBUG)) 671 ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, " 672 "bpg=%lu, ipg=%lu, mo=%04lx]", 673 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, 674 sbi->s_frag_size, 675 sbi->s_groups_count, 676 EXT2_BLOCKS_PER_GROUP(sb), 677 EXT2_INODES_PER_GROUP(sb), 678 sbi->s_mount_opt); 679 return res; 680 } 681 682 static int ext2_check_descriptors(struct super_block *sb) 683 { 684 int i; 685 struct ext2_sb_info *sbi = EXT2_SB(sb); 686 687 ext2_debug ("Checking group descriptors"); 688 689 for (i = 0; i < sbi->s_groups_count; i++) { 690 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL); 691 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i); 692 ext2_fsblk_t last_block = ext2_group_last_block_no(sb, i); 693 694 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || 695 le32_to_cpu(gdp->bg_block_bitmap) > last_block) 696 { 697 ext2_error (sb, "ext2_check_descriptors", 698 "Block bitmap for group %d" 699 " not in group (block %lu)!", 700 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); 701 return 0; 702 } 703 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || 704 le32_to_cpu(gdp->bg_inode_bitmap) > last_block) 705 { 706 ext2_error (sb, "ext2_check_descriptors", 707 "Inode bitmap for group %d" 708 " not in group (block %lu)!", 709 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); 710 return 0; 711 } 712 if (le32_to_cpu(gdp->bg_inode_table) < first_block || 713 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > 714 last_block) 715 { 716 ext2_error (sb, "ext2_check_descriptors", 717 "Inode table for group %d" 718 " not in group (block %lu)!", 719 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); 720 return 0; 721 } 722 } 723 return 1; 724 } 725 726 /* 727 * Maximal file size. There is a direct, and {,double-,triple-}indirect 728 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. 729 * We need to be 1 filesystem block less than the 2^32 sector limit. 730 */ 731 static loff_t ext2_max_size(int bits) 732 { 733 loff_t res = EXT2_NDIR_BLOCKS; 734 int meta_blocks; 735 unsigned int upper_limit; 736 unsigned int ppb = 1 << (bits-2); 737 738 /* This is calculated to be the largest file size for a 739 * dense, file such that the total number of 740 * sectors in the file, including data and all indirect blocks, 741 * does not exceed 2^32 -1 742 * __u32 i_blocks representing the total number of 743 * 512 bytes blocks of the file 744 */ 745 upper_limit = (1LL << 32) - 1; 746 747 /* total blocks in file system block size */ 748 upper_limit >>= (bits - 9); 749 750 /* Compute how many blocks we can address by block tree */ 751 res += 1LL << (bits-2); 752 res += 1LL << (2*(bits-2)); 753 res += 1LL << (3*(bits-2)); 754 /* Compute how many metadata blocks are needed */ 755 meta_blocks = 1; 756 meta_blocks += 1 + ppb; 757 meta_blocks += 1 + ppb + ppb * ppb; 758 /* Does block tree limit file size? */ 759 if (res + meta_blocks <= upper_limit) 760 goto check_lfs; 761 762 res = upper_limit; 763 /* How many metadata blocks are needed for addressing upper_limit? */ 764 upper_limit -= EXT2_NDIR_BLOCKS; 765 /* indirect blocks */ 766 meta_blocks = 1; 767 upper_limit -= ppb; 768 /* double indirect blocks */ 769 if (upper_limit < ppb * ppb) { 770 meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb); 771 res -= meta_blocks; 772 goto check_lfs; 773 } 774 meta_blocks += 1 + ppb; 775 upper_limit -= ppb * ppb; 776 /* tripple indirect blocks for the rest */ 777 meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb) + 778 DIV_ROUND_UP(upper_limit, ppb*ppb); 779 res -= meta_blocks; 780 check_lfs: 781 res <<= bits; 782 if (res > MAX_LFS_FILESIZE) 783 res = MAX_LFS_FILESIZE; 784 785 return res; 786 } 787 788 static unsigned long descriptor_loc(struct super_block *sb, 789 unsigned long logic_sb_block, 790 int nr) 791 { 792 struct ext2_sb_info *sbi = EXT2_SB(sb); 793 unsigned long bg, first_meta_bg; 794 795 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 796 797 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || 798 nr < first_meta_bg) 799 return (logic_sb_block + nr + 1); 800 bg = sbi->s_desc_per_block * nr; 801 802 return ext2_group_first_block_no(sb, bg) + ext2_bg_has_super(sb, bg); 803 } 804 805 static int ext2_fill_super(struct super_block *sb, void *data, int silent) 806 { 807 struct buffer_head * bh; 808 struct ext2_sb_info * sbi; 809 struct ext2_super_block * es; 810 struct inode *root; 811 unsigned long block; 812 unsigned long sb_block = get_sb_block(&data); 813 unsigned long logic_sb_block; 814 unsigned long offset = 0; 815 unsigned long def_mount_opts; 816 long ret = -ENOMEM; 817 int blocksize = BLOCK_SIZE; 818 int db_count; 819 int i, j; 820 __le32 features; 821 int err; 822 struct ext2_mount_options opts; 823 824 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 825 if (!sbi) 826 return -ENOMEM; 827 828 sbi->s_blockgroup_lock = 829 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); 830 if (!sbi->s_blockgroup_lock) { 831 kfree(sbi); 832 return -ENOMEM; 833 } 834 sb->s_fs_info = sbi; 835 sbi->s_sb_block = sb_block; 836 sbi->s_daxdev = fs_dax_get_by_bdev(sb->s_bdev, &sbi->s_dax_part_off, 837 NULL, NULL); 838 839 spin_lock_init(&sbi->s_lock); 840 ret = -EINVAL; 841 842 /* 843 * See what the current blocksize for the device is, and 844 * use that as the blocksize. Otherwise (or if the blocksize 845 * is smaller than the default) use the default. 846 * This is important for devices that have a hardware 847 * sectorsize that is larger than the default. 848 */ 849 blocksize = sb_min_blocksize(sb, BLOCK_SIZE); 850 if (!blocksize) { 851 ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); 852 goto failed_sbi; 853 } 854 855 /* 856 * If the superblock doesn't start on a hardware sector boundary, 857 * calculate the offset. 858 */ 859 if (blocksize != BLOCK_SIZE) { 860 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 861 offset = (sb_block*BLOCK_SIZE) % blocksize; 862 } else { 863 logic_sb_block = sb_block; 864 } 865 866 if (!(bh = sb_bread(sb, logic_sb_block))) { 867 ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); 868 goto failed_sbi; 869 } 870 /* 871 * Note: s_es must be initialized as soon as possible because 872 * some ext2 macro-instructions depend on its value 873 */ 874 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 875 sbi->s_es = es; 876 sb->s_magic = le16_to_cpu(es->s_magic); 877 878 if (sb->s_magic != EXT2_SUPER_MAGIC) 879 goto cantfind_ext2; 880 881 opts.s_mount_opt = 0; 882 /* Set defaults before we parse the mount options */ 883 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 884 if (def_mount_opts & EXT2_DEFM_DEBUG) 885 set_opt(opts.s_mount_opt, DEBUG); 886 if (def_mount_opts & EXT2_DEFM_BSDGROUPS) 887 set_opt(opts.s_mount_opt, GRPID); 888 if (def_mount_opts & EXT2_DEFM_UID16) 889 set_opt(opts.s_mount_opt, NO_UID32); 890 #ifdef CONFIG_EXT2_FS_XATTR 891 if (def_mount_opts & EXT2_DEFM_XATTR_USER) 892 set_opt(opts.s_mount_opt, XATTR_USER); 893 #endif 894 #ifdef CONFIG_EXT2_FS_POSIX_ACL 895 if (def_mount_opts & EXT2_DEFM_ACL) 896 set_opt(opts.s_mount_opt, POSIX_ACL); 897 #endif 898 899 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) 900 set_opt(opts.s_mount_opt, ERRORS_PANIC); 901 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) 902 set_opt(opts.s_mount_opt, ERRORS_CONT); 903 else 904 set_opt(opts.s_mount_opt, ERRORS_RO); 905 906 opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); 907 opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); 908 909 set_opt(opts.s_mount_opt, RESERVATION); 910 911 if (!parse_options((char *) data, sb, &opts)) 912 goto failed_mount; 913 914 sbi->s_mount_opt = opts.s_mount_opt; 915 sbi->s_resuid = opts.s_resuid; 916 sbi->s_resgid = opts.s_resgid; 917 918 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | 919 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0); 920 sb->s_iflags |= SB_I_CGROUPWB; 921 922 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && 923 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || 924 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 925 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) 926 ext2_msg(sb, KERN_WARNING, 927 "warning: feature flags set on rev 0 fs, " 928 "running e2fsck is recommended"); 929 /* 930 * Check feature flags regardless of the revision level, since we 931 * previously didn't change the revision level when setting the flags, 932 * so there is a chance incompat flags are set on a rev 0 filesystem. 933 */ 934 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); 935 if (features) { 936 ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " 937 "unsupported optional features (%x)", 938 le32_to_cpu(features)); 939 goto failed_mount; 940 } 941 if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ 942 ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " 943 "unsupported optional features (%x)", 944 le32_to_cpu(features)); 945 goto failed_mount; 946 } 947 948 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); 949 950 if (test_opt(sb, DAX)) { 951 if (!sbi->s_daxdev) { 952 ext2_msg(sb, KERN_ERR, 953 "DAX unsupported by block device. Turning off DAX."); 954 clear_opt(sbi->s_mount_opt, DAX); 955 } else if (blocksize != PAGE_SIZE) { 956 ext2_msg(sb, KERN_ERR, "unsupported blocksize for DAX\n"); 957 clear_opt(sbi->s_mount_opt, DAX); 958 } 959 } 960 961 /* If the blocksize doesn't match, re-read the thing.. */ 962 if (sb->s_blocksize != blocksize) { 963 brelse(bh); 964 965 if (!sb_set_blocksize(sb, blocksize)) { 966 ext2_msg(sb, KERN_ERR, 967 "error: bad blocksize %d", blocksize); 968 goto failed_sbi; 969 } 970 971 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 972 offset = (sb_block*BLOCK_SIZE) % blocksize; 973 bh = sb_bread(sb, logic_sb_block); 974 if(!bh) { 975 ext2_msg(sb, KERN_ERR, "error: couldn't read" 976 "superblock on 2nd try"); 977 goto failed_sbi; 978 } 979 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 980 sbi->s_es = es; 981 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { 982 ext2_msg(sb, KERN_ERR, "error: magic mismatch"); 983 goto failed_mount; 984 } 985 } 986 987 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); 988 sb->s_max_links = EXT2_LINK_MAX; 989 sb->s_time_min = S32_MIN; 990 sb->s_time_max = S32_MAX; 991 992 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { 993 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; 994 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; 995 } else { 996 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 997 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 998 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || 999 !is_power_of_2(sbi->s_inode_size) || 1000 (sbi->s_inode_size > blocksize)) { 1001 ext2_msg(sb, KERN_ERR, 1002 "error: unsupported inode size: %d", 1003 sbi->s_inode_size); 1004 goto failed_mount; 1005 } 1006 } 1007 1008 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << 1009 le32_to_cpu(es->s_log_frag_size); 1010 if (sbi->s_frag_size == 0) 1011 goto cantfind_ext2; 1012 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; 1013 1014 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 1015 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); 1016 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 1017 1018 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); 1019 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) 1020 goto cantfind_ext2; 1021 sbi->s_itb_per_group = sbi->s_inodes_per_group / 1022 sbi->s_inodes_per_block; 1023 sbi->s_desc_per_block = sb->s_blocksize / 1024 sizeof (struct ext2_group_desc); 1025 sbi->s_sbh = bh; 1026 sbi->s_mount_state = le16_to_cpu(es->s_state); 1027 sbi->s_addr_per_block_bits = 1028 ilog2 (EXT2_ADDR_PER_BLOCK(sb)); 1029 sbi->s_desc_per_block_bits = 1030 ilog2 (EXT2_DESC_PER_BLOCK(sb)); 1031 1032 if (sb->s_magic != EXT2_SUPER_MAGIC) 1033 goto cantfind_ext2; 1034 1035 if (sb->s_blocksize != bh->b_size) { 1036 if (!silent) 1037 ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); 1038 goto failed_mount; 1039 } 1040 1041 if (sb->s_blocksize != sbi->s_frag_size) { 1042 ext2_msg(sb, KERN_ERR, 1043 "error: fragsize %lu != blocksize %lu" 1044 "(not supported yet)", 1045 sbi->s_frag_size, sb->s_blocksize); 1046 goto failed_mount; 1047 } 1048 1049 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { 1050 ext2_msg(sb, KERN_ERR, 1051 "error: #blocks per group too big: %lu", 1052 sbi->s_blocks_per_group); 1053 goto failed_mount; 1054 } 1055 /* At least inode table, bitmaps, and sb have to fit in one group */ 1056 if (sbi->s_blocks_per_group <= sbi->s_itb_per_group + 3) { 1057 ext2_msg(sb, KERN_ERR, 1058 "error: #blocks per group smaller than metadata size: %lu <= %lu", 1059 sbi->s_blocks_per_group, sbi->s_inodes_per_group + 3); 1060 goto failed_mount; 1061 } 1062 if (sbi->s_frags_per_group > sb->s_blocksize * 8) { 1063 ext2_msg(sb, KERN_ERR, 1064 "error: #fragments per group too big: %lu", 1065 sbi->s_frags_per_group); 1066 goto failed_mount; 1067 } 1068 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block || 1069 sbi->s_inodes_per_group > sb->s_blocksize * 8) { 1070 ext2_msg(sb, KERN_ERR, 1071 "error: invalid #inodes per group: %lu", 1072 sbi->s_inodes_per_group); 1073 goto failed_mount; 1074 } 1075 if (sb_bdev_nr_blocks(sb) < le32_to_cpu(es->s_blocks_count)) { 1076 ext2_msg(sb, KERN_ERR, 1077 "bad geometry: block count %u exceeds size of device (%u blocks)", 1078 le32_to_cpu(es->s_blocks_count), 1079 (unsigned)sb_bdev_nr_blocks(sb)); 1080 goto failed_mount; 1081 } 1082 1083 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - 1084 le32_to_cpu(es->s_first_data_block) - 1) 1085 / EXT2_BLOCKS_PER_GROUP(sb)) + 1; 1086 if ((u64)sbi->s_groups_count * sbi->s_inodes_per_group != 1087 le32_to_cpu(es->s_inodes_count)) { 1088 ext2_msg(sb, KERN_ERR, "error: invalid #inodes: %u vs computed %llu", 1089 le32_to_cpu(es->s_inodes_count), 1090 (u64)sbi->s_groups_count * sbi->s_inodes_per_group); 1091 goto failed_mount; 1092 } 1093 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / 1094 EXT2_DESC_PER_BLOCK(sb); 1095 sbi->s_group_desc = kvmalloc_array(db_count, 1096 sizeof(struct buffer_head *), 1097 GFP_KERNEL); 1098 if (sbi->s_group_desc == NULL) { 1099 ret = -ENOMEM; 1100 ext2_msg(sb, KERN_ERR, "error: not enough memory"); 1101 goto failed_mount; 1102 } 1103 bgl_lock_init(sbi->s_blockgroup_lock); 1104 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); 1105 if (!sbi->s_debts) { 1106 ret = -ENOMEM; 1107 ext2_msg(sb, KERN_ERR, "error: not enough memory"); 1108 goto failed_mount_group_desc; 1109 } 1110 for (i = 0; i < db_count; i++) { 1111 block = descriptor_loc(sb, logic_sb_block, i); 1112 sbi->s_group_desc[i] = sb_bread(sb, block); 1113 if (!sbi->s_group_desc[i]) { 1114 for (j = 0; j < i; j++) 1115 brelse (sbi->s_group_desc[j]); 1116 ext2_msg(sb, KERN_ERR, 1117 "error: unable to read group descriptors"); 1118 goto failed_mount_group_desc; 1119 } 1120 } 1121 if (!ext2_check_descriptors (sb)) { 1122 ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); 1123 goto failed_mount2; 1124 } 1125 sbi->s_gdb_count = db_count; 1126 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 1127 spin_lock_init(&sbi->s_next_gen_lock); 1128 1129 /* per filesystem reservation list head & lock */ 1130 spin_lock_init(&sbi->s_rsv_window_lock); 1131 sbi->s_rsv_window_root = RB_ROOT; 1132 /* 1133 * Add a single, static dummy reservation to the start of the 1134 * reservation window list --- it gives us a placeholder for 1135 * append-at-start-of-list which makes the allocation logic 1136 * _much_ simpler. 1137 */ 1138 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; 1139 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; 1140 sbi->s_rsv_window_head.rsv_alloc_hit = 0; 1141 sbi->s_rsv_window_head.rsv_goal_size = 0; 1142 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); 1143 1144 err = percpu_counter_init(&sbi->s_freeblocks_counter, 1145 ext2_count_free_blocks(sb), GFP_KERNEL); 1146 if (!err) { 1147 err = percpu_counter_init(&sbi->s_freeinodes_counter, 1148 ext2_count_free_inodes(sb), GFP_KERNEL); 1149 } 1150 if (!err) { 1151 err = percpu_counter_init(&sbi->s_dirs_counter, 1152 ext2_count_dirs(sb), GFP_KERNEL); 1153 } 1154 if (err) { 1155 ret = err; 1156 ext2_msg(sb, KERN_ERR, "error: insufficient memory"); 1157 goto failed_mount3; 1158 } 1159 1160 #ifdef CONFIG_EXT2_FS_XATTR 1161 sbi->s_ea_block_cache = ext2_xattr_create_cache(); 1162 if (!sbi->s_ea_block_cache) { 1163 ret = -ENOMEM; 1164 ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache"); 1165 goto failed_mount3; 1166 } 1167 #endif 1168 /* 1169 * set up enough so that it can read an inode 1170 */ 1171 sb->s_op = &ext2_sops; 1172 sb->s_export_op = &ext2_export_ops; 1173 sb->s_xattr = ext2_xattr_handlers; 1174 1175 #ifdef CONFIG_QUOTA 1176 sb->dq_op = &dquot_operations; 1177 sb->s_qcop = &ext2_quotactl_ops; 1178 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1179 #endif 1180 1181 root = ext2_iget(sb, EXT2_ROOT_INO); 1182 if (IS_ERR(root)) { 1183 ret = PTR_ERR(root); 1184 goto failed_mount3; 1185 } 1186 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 1187 iput(root); 1188 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); 1189 goto failed_mount3; 1190 } 1191 1192 sb->s_root = d_make_root(root); 1193 if (!sb->s_root) { 1194 ext2_msg(sb, KERN_ERR, "error: get root inode failed"); 1195 ret = -ENOMEM; 1196 goto failed_mount3; 1197 } 1198 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 1199 ext2_msg(sb, KERN_WARNING, 1200 "warning: mounting ext3 filesystem as ext2"); 1201 if (ext2_setup_super (sb, es, sb_rdonly(sb))) 1202 sb->s_flags |= SB_RDONLY; 1203 ext2_write_super(sb); 1204 return 0; 1205 1206 cantfind_ext2: 1207 if (!silent) 1208 ext2_msg(sb, KERN_ERR, 1209 "error: can't find an ext2 filesystem on dev %s.", 1210 sb->s_id); 1211 goto failed_mount; 1212 failed_mount3: 1213 ext2_xattr_destroy_cache(sbi->s_ea_block_cache); 1214 percpu_counter_destroy(&sbi->s_freeblocks_counter); 1215 percpu_counter_destroy(&sbi->s_freeinodes_counter); 1216 percpu_counter_destroy(&sbi->s_dirs_counter); 1217 failed_mount2: 1218 for (i = 0; i < db_count; i++) 1219 brelse(sbi->s_group_desc[i]); 1220 failed_mount_group_desc: 1221 kvfree(sbi->s_group_desc); 1222 kfree(sbi->s_debts); 1223 failed_mount: 1224 brelse(bh); 1225 failed_sbi: 1226 fs_put_dax(sbi->s_daxdev, NULL); 1227 sb->s_fs_info = NULL; 1228 kfree(sbi->s_blockgroup_lock); 1229 kfree(sbi); 1230 return ret; 1231 } 1232 1233 static void ext2_clear_super_error(struct super_block *sb) 1234 { 1235 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; 1236 1237 if (buffer_write_io_error(sbh)) { 1238 /* 1239 * Oh, dear. A previous attempt to write the 1240 * superblock failed. This could happen because the 1241 * USB device was yanked out. Or it could happen to 1242 * be a transient write error and maybe the block will 1243 * be remapped. Nothing we can do but to retry the 1244 * write and hope for the best. 1245 */ 1246 ext2_msg(sb, KERN_ERR, 1247 "previous I/O error to superblock detected"); 1248 clear_buffer_write_io_error(sbh); 1249 set_buffer_uptodate(sbh); 1250 } 1251 } 1252 1253 void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, 1254 int wait) 1255 { 1256 ext2_clear_super_error(sb); 1257 spin_lock(&EXT2_SB(sb)->s_lock); 1258 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); 1259 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); 1260 es->s_wtime = cpu_to_le32(ktime_get_real_seconds()); 1261 /* unlock before we do IO */ 1262 spin_unlock(&EXT2_SB(sb)->s_lock); 1263 mark_buffer_dirty(EXT2_SB(sb)->s_sbh); 1264 if (wait) 1265 sync_dirty_buffer(EXT2_SB(sb)->s_sbh); 1266 } 1267 1268 /* 1269 * In the second extended file system, it is not necessary to 1270 * write the super block since we use a mapping of the 1271 * disk super block in a buffer. 1272 * 1273 * However, this function is still used to set the fs valid 1274 * flags to 0. We need to set this flag to 0 since the fs 1275 * may have been checked while mounted and e2fsck may have 1276 * set s_state to EXT2_VALID_FS after some corrections. 1277 */ 1278 static int ext2_sync_fs(struct super_block *sb, int wait) 1279 { 1280 struct ext2_sb_info *sbi = EXT2_SB(sb); 1281 struct ext2_super_block *es = EXT2_SB(sb)->s_es; 1282 1283 /* 1284 * Write quota structures to quota file, sync_blockdev() will write 1285 * them to disk later 1286 */ 1287 dquot_writeback_dquots(sb, -1); 1288 1289 spin_lock(&sbi->s_lock); 1290 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { 1291 ext2_debug("setting valid to 0\n"); 1292 es->s_state &= cpu_to_le16(~EXT2_VALID_FS); 1293 } 1294 spin_unlock(&sbi->s_lock); 1295 ext2_sync_super(sb, es, wait); 1296 return 0; 1297 } 1298 1299 static int ext2_freeze(struct super_block *sb) 1300 { 1301 struct ext2_sb_info *sbi = EXT2_SB(sb); 1302 1303 /* 1304 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared 1305 * because we have unattached inodes and thus filesystem is not fully 1306 * consistent. 1307 */ 1308 if (atomic_long_read(&sb->s_remove_count)) { 1309 ext2_sync_fs(sb, 1); 1310 return 0; 1311 } 1312 /* Set EXT2_FS_VALID flag */ 1313 spin_lock(&sbi->s_lock); 1314 sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state); 1315 spin_unlock(&sbi->s_lock); 1316 ext2_sync_super(sb, sbi->s_es, 1); 1317 1318 return 0; 1319 } 1320 1321 static int ext2_unfreeze(struct super_block *sb) 1322 { 1323 /* Just write sb to clear EXT2_VALID_FS flag */ 1324 ext2_write_super(sb); 1325 1326 return 0; 1327 } 1328 1329 static void ext2_write_super(struct super_block *sb) 1330 { 1331 if (!sb_rdonly(sb)) 1332 ext2_sync_fs(sb, 1); 1333 } 1334 1335 static int ext2_remount (struct super_block * sb, int * flags, char * data) 1336 { 1337 struct ext2_sb_info * sbi = EXT2_SB(sb); 1338 struct ext2_super_block * es; 1339 struct ext2_mount_options new_opts; 1340 int err; 1341 1342 sync_filesystem(sb); 1343 1344 spin_lock(&sbi->s_lock); 1345 new_opts.s_mount_opt = sbi->s_mount_opt; 1346 new_opts.s_resuid = sbi->s_resuid; 1347 new_opts.s_resgid = sbi->s_resgid; 1348 spin_unlock(&sbi->s_lock); 1349 1350 if (!parse_options(data, sb, &new_opts)) 1351 return -EINVAL; 1352 1353 spin_lock(&sbi->s_lock); 1354 es = sbi->s_es; 1355 if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) { 1356 ext2_msg(sb, KERN_WARNING, "warning: refusing change of " 1357 "dax flag with busy inodes while remounting"); 1358 new_opts.s_mount_opt ^= EXT2_MOUNT_DAX; 1359 } 1360 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) 1361 goto out_set; 1362 if (*flags & SB_RDONLY) { 1363 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || 1364 !(sbi->s_mount_state & EXT2_VALID_FS)) 1365 goto out_set; 1366 1367 /* 1368 * OK, we are remounting a valid rw partition rdonly, so set 1369 * the rdonly flag and then mark the partition as valid again. 1370 */ 1371 es->s_state = cpu_to_le16(sbi->s_mount_state); 1372 es->s_mtime = cpu_to_le32(ktime_get_real_seconds()); 1373 spin_unlock(&sbi->s_lock); 1374 1375 err = dquot_suspend(sb, -1); 1376 if (err < 0) 1377 return err; 1378 1379 ext2_sync_super(sb, es, 1); 1380 } else { 1381 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, 1382 ~EXT2_FEATURE_RO_COMPAT_SUPP); 1383 if (ret) { 1384 spin_unlock(&sbi->s_lock); 1385 ext2_msg(sb, KERN_WARNING, 1386 "warning: couldn't remount RDWR because of " 1387 "unsupported optional features (%x).", 1388 le32_to_cpu(ret)); 1389 return -EROFS; 1390 } 1391 /* 1392 * Mounting a RDONLY partition read-write, so reread and 1393 * store the current valid flag. (It may have been changed 1394 * by e2fsck since we originally mounted the partition.) 1395 */ 1396 sbi->s_mount_state = le16_to_cpu(es->s_state); 1397 if (!ext2_setup_super (sb, es, 0)) 1398 sb->s_flags &= ~SB_RDONLY; 1399 spin_unlock(&sbi->s_lock); 1400 1401 ext2_write_super(sb); 1402 1403 dquot_resume(sb, -1); 1404 } 1405 1406 spin_lock(&sbi->s_lock); 1407 out_set: 1408 sbi->s_mount_opt = new_opts.s_mount_opt; 1409 sbi->s_resuid = new_opts.s_resuid; 1410 sbi->s_resgid = new_opts.s_resgid; 1411 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | 1412 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0); 1413 spin_unlock(&sbi->s_lock); 1414 1415 return 0; 1416 } 1417 1418 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) 1419 { 1420 struct super_block *sb = dentry->d_sb; 1421 struct ext2_sb_info *sbi = EXT2_SB(sb); 1422 struct ext2_super_block *es = sbi->s_es; 1423 1424 spin_lock(&sbi->s_lock); 1425 1426 if (test_opt (sb, MINIX_DF)) 1427 sbi->s_overhead_last = 0; 1428 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { 1429 unsigned long i, overhead = 0; 1430 smp_rmb(); 1431 1432 /* 1433 * Compute the overhead (FS structures). This is constant 1434 * for a given filesystem unless the number of block groups 1435 * changes so we cache the previous value until it does. 1436 */ 1437 1438 /* 1439 * All of the blocks before first_data_block are 1440 * overhead 1441 */ 1442 overhead = le32_to_cpu(es->s_first_data_block); 1443 1444 /* 1445 * Add the overhead attributed to the superblock and 1446 * block group descriptors. If the sparse superblocks 1447 * feature is turned on, then not all groups have this. 1448 */ 1449 for (i = 0; i < sbi->s_groups_count; i++) 1450 overhead += ext2_bg_has_super(sb, i) + 1451 ext2_bg_num_gdb(sb, i); 1452 1453 /* 1454 * Every block group has an inode bitmap, a block 1455 * bitmap, and an inode table. 1456 */ 1457 overhead += (sbi->s_groups_count * 1458 (2 + sbi->s_itb_per_group)); 1459 sbi->s_overhead_last = overhead; 1460 smp_wmb(); 1461 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); 1462 } 1463 1464 buf->f_type = EXT2_SUPER_MAGIC; 1465 buf->f_bsize = sb->s_blocksize; 1466 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; 1467 buf->f_bfree = ext2_count_free_blocks(sb); 1468 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); 1469 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); 1470 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) 1471 buf->f_bavail = 0; 1472 buf->f_files = le32_to_cpu(es->s_inodes_count); 1473 buf->f_ffree = ext2_count_free_inodes(sb); 1474 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); 1475 buf->f_namelen = EXT2_NAME_LEN; 1476 buf->f_fsid = uuid_to_fsid(es->s_uuid); 1477 spin_unlock(&sbi->s_lock); 1478 return 0; 1479 } 1480 1481 static struct dentry *ext2_mount(struct file_system_type *fs_type, 1482 int flags, const char *dev_name, void *data) 1483 { 1484 return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super); 1485 } 1486 1487 #ifdef CONFIG_QUOTA 1488 1489 /* Read data from quotafile - avoid pagecache and such because we cannot afford 1490 * acquiring the locks... As quota files are never truncated and quota code 1491 * itself serializes the operations (and no one else should touch the files) 1492 * we don't have to be afraid of races */ 1493 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, 1494 size_t len, loff_t off) 1495 { 1496 struct inode *inode = sb_dqopt(sb)->files[type]; 1497 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1498 int err = 0; 1499 int offset = off & (sb->s_blocksize - 1); 1500 int tocopy; 1501 size_t toread; 1502 struct buffer_head tmp_bh; 1503 struct buffer_head *bh; 1504 loff_t i_size = i_size_read(inode); 1505 1506 if (off > i_size) 1507 return 0; 1508 if (off+len > i_size) 1509 len = i_size-off; 1510 toread = len; 1511 while (toread > 0) { 1512 tocopy = min_t(size_t, sb->s_blocksize - offset, toread); 1513 1514 tmp_bh.b_state = 0; 1515 tmp_bh.b_size = sb->s_blocksize; 1516 err = ext2_get_block(inode, blk, &tmp_bh, 0); 1517 if (err < 0) 1518 return err; 1519 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 1520 memset(data, 0, tocopy); 1521 else { 1522 bh = sb_bread(sb, tmp_bh.b_blocknr); 1523 if (!bh) 1524 return -EIO; 1525 memcpy(data, bh->b_data+offset, tocopy); 1526 brelse(bh); 1527 } 1528 offset = 0; 1529 toread -= tocopy; 1530 data += tocopy; 1531 blk++; 1532 } 1533 return len; 1534 } 1535 1536 /* Write to quotafile */ 1537 static ssize_t ext2_quota_write(struct super_block *sb, int type, 1538 const char *data, size_t len, loff_t off) 1539 { 1540 struct inode *inode = sb_dqopt(sb)->files[type]; 1541 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1542 int err = 0; 1543 int offset = off & (sb->s_blocksize - 1); 1544 int tocopy; 1545 size_t towrite = len; 1546 struct buffer_head tmp_bh; 1547 struct buffer_head *bh; 1548 1549 while (towrite > 0) { 1550 tocopy = min_t(size_t, sb->s_blocksize - offset, towrite); 1551 1552 tmp_bh.b_state = 0; 1553 tmp_bh.b_size = sb->s_blocksize; 1554 err = ext2_get_block(inode, blk, &tmp_bh, 1); 1555 if (err < 0) 1556 goto out; 1557 if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) 1558 bh = sb_bread(sb, tmp_bh.b_blocknr); 1559 else 1560 bh = sb_getblk(sb, tmp_bh.b_blocknr); 1561 if (unlikely(!bh)) { 1562 err = -EIO; 1563 goto out; 1564 } 1565 lock_buffer(bh); 1566 memcpy(bh->b_data+offset, data, tocopy); 1567 flush_dcache_page(bh->b_page); 1568 set_buffer_uptodate(bh); 1569 mark_buffer_dirty(bh); 1570 unlock_buffer(bh); 1571 brelse(bh); 1572 offset = 0; 1573 towrite -= tocopy; 1574 data += tocopy; 1575 blk++; 1576 } 1577 out: 1578 if (len == towrite) 1579 return err; 1580 if (inode->i_size < off+len-towrite) 1581 i_size_write(inode, off+len-towrite); 1582 inode_inc_iversion(inode); 1583 inode->i_mtime = inode->i_ctime = current_time(inode); 1584 mark_inode_dirty(inode); 1585 return len - towrite; 1586 } 1587 1588 static int ext2_quota_on(struct super_block *sb, int type, int format_id, 1589 const struct path *path) 1590 { 1591 int err; 1592 struct inode *inode; 1593 1594 err = dquot_quota_on(sb, type, format_id, path); 1595 if (err) 1596 return err; 1597 1598 inode = d_inode(path->dentry); 1599 inode_lock(inode); 1600 EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL; 1601 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, 1602 S_NOATIME | S_IMMUTABLE); 1603 inode_unlock(inode); 1604 mark_inode_dirty(inode); 1605 1606 return 0; 1607 } 1608 1609 static int ext2_quota_off(struct super_block *sb, int type) 1610 { 1611 struct inode *inode = sb_dqopt(sb)->files[type]; 1612 int err; 1613 1614 if (!inode || !igrab(inode)) 1615 goto out; 1616 1617 err = dquot_quota_off(sb, type); 1618 if (err) 1619 goto out_put; 1620 1621 inode_lock(inode); 1622 EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL); 1623 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); 1624 inode_unlock(inode); 1625 mark_inode_dirty(inode); 1626 out_put: 1627 iput(inode); 1628 return err; 1629 out: 1630 return dquot_quota_off(sb, type); 1631 } 1632 1633 #endif 1634 1635 static struct file_system_type ext2_fs_type = { 1636 .owner = THIS_MODULE, 1637 .name = "ext2", 1638 .mount = ext2_mount, 1639 .kill_sb = kill_block_super, 1640 .fs_flags = FS_REQUIRES_DEV, 1641 }; 1642 MODULE_ALIAS_FS("ext2"); 1643 1644 static int __init init_ext2_fs(void) 1645 { 1646 int err; 1647 1648 err = init_inodecache(); 1649 if (err) 1650 return err; 1651 err = register_filesystem(&ext2_fs_type); 1652 if (err) 1653 goto out; 1654 return 0; 1655 out: 1656 destroy_inodecache(); 1657 return err; 1658 } 1659 1660 static void __exit exit_ext2_fs(void) 1661 { 1662 unregister_filesystem(&ext2_fs_type); 1663 destroy_inodecache(); 1664 } 1665 1666 MODULE_AUTHOR("Remy Card and others"); 1667 MODULE_DESCRIPTION("Second Extended Filesystem"); 1668 MODULE_LICENSE("GPL"); 1669 module_init(init_ext2_fs) 1670 module_exit(exit_ext2_fs) 1671