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 #ifdef CONFIG_FS_DAX 210 init_rwsem(&ei->dax_sem); 211 #endif 212 inode_init_once(&ei->vfs_inode); 213 } 214 215 static int __init init_inodecache(void) 216 { 217 ext2_inode_cachep = kmem_cache_create_usercopy("ext2_inode_cache", 218 sizeof(struct ext2_inode_info), 0, 219 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| 220 SLAB_ACCOUNT), 221 offsetof(struct ext2_inode_info, i_data), 222 sizeof_field(struct ext2_inode_info, i_data), 223 init_once); 224 if (ext2_inode_cachep == NULL) 225 return -ENOMEM; 226 return 0; 227 } 228 229 static void destroy_inodecache(void) 230 { 231 /* 232 * Make sure all delayed rcu free inodes are flushed before we 233 * destroy cache. 234 */ 235 rcu_barrier(); 236 kmem_cache_destroy(ext2_inode_cachep); 237 } 238 239 static int ext2_show_options(struct seq_file *seq, struct dentry *root) 240 { 241 struct super_block *sb = root->d_sb; 242 struct ext2_sb_info *sbi = EXT2_SB(sb); 243 struct ext2_super_block *es = sbi->s_es; 244 unsigned long def_mount_opts; 245 246 spin_lock(&sbi->s_lock); 247 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 248 249 if (sbi->s_sb_block != 1) 250 seq_printf(seq, ",sb=%lu", sbi->s_sb_block); 251 if (test_opt(sb, MINIX_DF)) 252 seq_puts(seq, ",minixdf"); 253 if (test_opt(sb, GRPID)) 254 seq_puts(seq, ",grpid"); 255 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS)) 256 seq_puts(seq, ",nogrpid"); 257 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) || 258 le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) { 259 seq_printf(seq, ",resuid=%u", 260 from_kuid_munged(&init_user_ns, sbi->s_resuid)); 261 } 262 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) || 263 le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) { 264 seq_printf(seq, ",resgid=%u", 265 from_kgid_munged(&init_user_ns, sbi->s_resgid)); 266 } 267 if (test_opt(sb, ERRORS_RO)) { 268 int def_errors = le16_to_cpu(es->s_errors); 269 270 if (def_errors == EXT2_ERRORS_PANIC || 271 def_errors == EXT2_ERRORS_CONTINUE) { 272 seq_puts(seq, ",errors=remount-ro"); 273 } 274 } 275 if (test_opt(sb, ERRORS_CONT)) 276 seq_puts(seq, ",errors=continue"); 277 if (test_opt(sb, ERRORS_PANIC)) 278 seq_puts(seq, ",errors=panic"); 279 if (test_opt(sb, NO_UID32)) 280 seq_puts(seq, ",nouid32"); 281 if (test_opt(sb, DEBUG)) 282 seq_puts(seq, ",debug"); 283 if (test_opt(sb, OLDALLOC)) 284 seq_puts(seq, ",oldalloc"); 285 286 #ifdef CONFIG_EXT2_FS_XATTR 287 if (test_opt(sb, XATTR_USER)) 288 seq_puts(seq, ",user_xattr"); 289 if (!test_opt(sb, XATTR_USER) && 290 (def_mount_opts & EXT2_DEFM_XATTR_USER)) { 291 seq_puts(seq, ",nouser_xattr"); 292 } 293 #endif 294 295 #ifdef CONFIG_EXT2_FS_POSIX_ACL 296 if (test_opt(sb, POSIX_ACL)) 297 seq_puts(seq, ",acl"); 298 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL)) 299 seq_puts(seq, ",noacl"); 300 #endif 301 302 if (test_opt(sb, NOBH)) 303 seq_puts(seq, ",nobh"); 304 305 if (test_opt(sb, USRQUOTA)) 306 seq_puts(seq, ",usrquota"); 307 308 if (test_opt(sb, GRPQUOTA)) 309 seq_puts(seq, ",grpquota"); 310 311 if (test_opt(sb, XIP)) 312 seq_puts(seq, ",xip"); 313 314 if (test_opt(sb, DAX)) 315 seq_puts(seq, ",dax"); 316 317 if (!test_opt(sb, RESERVATION)) 318 seq_puts(seq, ",noreservation"); 319 320 spin_unlock(&sbi->s_lock); 321 return 0; 322 } 323 324 #ifdef CONFIG_QUOTA 325 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); 326 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); 327 static int ext2_quota_on(struct super_block *sb, int type, int format_id, 328 const struct path *path); 329 static struct dquot **ext2_get_dquots(struct inode *inode) 330 { 331 return EXT2_I(inode)->i_dquot; 332 } 333 334 static const struct quotactl_ops ext2_quotactl_ops = { 335 .quota_on = ext2_quota_on, 336 .quota_off = ext2_quota_off, 337 .quota_sync = dquot_quota_sync, 338 .get_state = dquot_get_state, 339 .set_info = dquot_set_dqinfo, 340 .get_dqblk = dquot_get_dqblk, 341 .set_dqblk = dquot_set_dqblk, 342 .get_nextdqblk = dquot_get_next_dqblk, 343 }; 344 #endif 345 346 static const struct super_operations ext2_sops = { 347 .alloc_inode = ext2_alloc_inode, 348 .free_inode = ext2_free_in_core_inode, 349 .write_inode = ext2_write_inode, 350 .evict_inode = ext2_evict_inode, 351 .put_super = ext2_put_super, 352 .sync_fs = ext2_sync_fs, 353 .freeze_fs = ext2_freeze, 354 .unfreeze_fs = ext2_unfreeze, 355 .statfs = ext2_statfs, 356 .remount_fs = ext2_remount, 357 .show_options = ext2_show_options, 358 #ifdef CONFIG_QUOTA 359 .quota_read = ext2_quota_read, 360 .quota_write = ext2_quota_write, 361 .get_dquots = ext2_get_dquots, 362 #endif 363 }; 364 365 static struct inode *ext2_nfs_get_inode(struct super_block *sb, 366 u64 ino, u32 generation) 367 { 368 struct inode *inode; 369 370 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) 371 return ERR_PTR(-ESTALE); 372 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) 373 return ERR_PTR(-ESTALE); 374 375 /* 376 * ext2_iget isn't quite right if the inode is currently unallocated! 377 * However ext2_iget currently does appropriate checks to handle stale 378 * inodes so everything is OK. 379 */ 380 inode = ext2_iget(sb, ino); 381 if (IS_ERR(inode)) 382 return ERR_CAST(inode); 383 if (generation && inode->i_generation != generation) { 384 /* we didn't find the right inode.. */ 385 iput(inode); 386 return ERR_PTR(-ESTALE); 387 } 388 return inode; 389 } 390 391 static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid, 392 int fh_len, int fh_type) 393 { 394 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 395 ext2_nfs_get_inode); 396 } 397 398 static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid, 399 int fh_len, int fh_type) 400 { 401 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 402 ext2_nfs_get_inode); 403 } 404 405 static const struct export_operations ext2_export_ops = { 406 .fh_to_dentry = ext2_fh_to_dentry, 407 .fh_to_parent = ext2_fh_to_parent, 408 .get_parent = ext2_get_parent, 409 }; 410 411 static unsigned long get_sb_block(void **data) 412 { 413 unsigned long sb_block; 414 char *options = (char *) *data; 415 416 if (!options || strncmp(options, "sb=", 3) != 0) 417 return 1; /* Default location */ 418 options += 3; 419 sb_block = simple_strtoul(options, &options, 0); 420 if (*options && *options != ',') { 421 printk("EXT2-fs: Invalid sb specification: %s\n", 422 (char *) *data); 423 return 1; 424 } 425 if (*options == ',') 426 options++; 427 *data = (void *) options; 428 return sb_block; 429 } 430 431 enum { 432 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 433 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, 434 Opt_err_ro, Opt_nouid32, Opt_debug, 435 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, 436 Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota, 437 Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation 438 }; 439 440 static const match_table_t tokens = { 441 {Opt_bsd_df, "bsddf"}, 442 {Opt_minix_df, "minixdf"}, 443 {Opt_grpid, "grpid"}, 444 {Opt_grpid, "bsdgroups"}, 445 {Opt_nogrpid, "nogrpid"}, 446 {Opt_nogrpid, "sysvgroups"}, 447 {Opt_resgid, "resgid=%u"}, 448 {Opt_resuid, "resuid=%u"}, 449 {Opt_sb, "sb=%u"}, 450 {Opt_err_cont, "errors=continue"}, 451 {Opt_err_panic, "errors=panic"}, 452 {Opt_err_ro, "errors=remount-ro"}, 453 {Opt_nouid32, "nouid32"}, 454 {Opt_debug, "debug"}, 455 {Opt_oldalloc, "oldalloc"}, 456 {Opt_orlov, "orlov"}, 457 {Opt_nobh, "nobh"}, 458 {Opt_user_xattr, "user_xattr"}, 459 {Opt_nouser_xattr, "nouser_xattr"}, 460 {Opt_acl, "acl"}, 461 {Opt_noacl, "noacl"}, 462 {Opt_xip, "xip"}, 463 {Opt_dax, "dax"}, 464 {Opt_grpquota, "grpquota"}, 465 {Opt_ignore, "noquota"}, 466 {Opt_quota, "quota"}, 467 {Opt_usrquota, "usrquota"}, 468 {Opt_reservation, "reservation"}, 469 {Opt_noreservation, "noreservation"}, 470 {Opt_err, NULL} 471 }; 472 473 static int parse_options(char *options, struct super_block *sb, 474 struct ext2_mount_options *opts) 475 { 476 char *p; 477 substring_t args[MAX_OPT_ARGS]; 478 int option; 479 kuid_t uid; 480 kgid_t gid; 481 482 if (!options) 483 return 1; 484 485 while ((p = strsep (&options, ",")) != NULL) { 486 int token; 487 if (!*p) 488 continue; 489 490 token = match_token(p, tokens, args); 491 switch (token) { 492 case Opt_bsd_df: 493 clear_opt (opts->s_mount_opt, MINIX_DF); 494 break; 495 case Opt_minix_df: 496 set_opt (opts->s_mount_opt, MINIX_DF); 497 break; 498 case Opt_grpid: 499 set_opt (opts->s_mount_opt, GRPID); 500 break; 501 case Opt_nogrpid: 502 clear_opt (opts->s_mount_opt, GRPID); 503 break; 504 case Opt_resuid: 505 if (match_int(&args[0], &option)) 506 return 0; 507 uid = make_kuid(current_user_ns(), option); 508 if (!uid_valid(uid)) { 509 ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option); 510 return 0; 511 512 } 513 opts->s_resuid = uid; 514 break; 515 case Opt_resgid: 516 if (match_int(&args[0], &option)) 517 return 0; 518 gid = make_kgid(current_user_ns(), option); 519 if (!gid_valid(gid)) { 520 ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option); 521 return 0; 522 } 523 opts->s_resgid = gid; 524 break; 525 case Opt_sb: 526 /* handled by get_sb_block() instead of here */ 527 /* *sb_block = match_int(&args[0]); */ 528 break; 529 case Opt_err_panic: 530 clear_opt (opts->s_mount_opt, ERRORS_CONT); 531 clear_opt (opts->s_mount_opt, ERRORS_RO); 532 set_opt (opts->s_mount_opt, ERRORS_PANIC); 533 break; 534 case Opt_err_ro: 535 clear_opt (opts->s_mount_opt, ERRORS_CONT); 536 clear_opt (opts->s_mount_opt, ERRORS_PANIC); 537 set_opt (opts->s_mount_opt, ERRORS_RO); 538 break; 539 case Opt_err_cont: 540 clear_opt (opts->s_mount_opt, ERRORS_RO); 541 clear_opt (opts->s_mount_opt, ERRORS_PANIC); 542 set_opt (opts->s_mount_opt, ERRORS_CONT); 543 break; 544 case Opt_nouid32: 545 set_opt (opts->s_mount_opt, NO_UID32); 546 break; 547 case Opt_debug: 548 set_opt (opts->s_mount_opt, DEBUG); 549 break; 550 case Opt_oldalloc: 551 set_opt (opts->s_mount_opt, OLDALLOC); 552 break; 553 case Opt_orlov: 554 clear_opt (opts->s_mount_opt, OLDALLOC); 555 break; 556 case Opt_nobh: 557 set_opt (opts->s_mount_opt, NOBH); 558 break; 559 #ifdef CONFIG_EXT2_FS_XATTR 560 case Opt_user_xattr: 561 set_opt (opts->s_mount_opt, XATTR_USER); 562 break; 563 case Opt_nouser_xattr: 564 clear_opt (opts->s_mount_opt, XATTR_USER); 565 break; 566 #else 567 case Opt_user_xattr: 568 case Opt_nouser_xattr: 569 ext2_msg(sb, KERN_INFO, "(no)user_xattr options" 570 "not supported"); 571 break; 572 #endif 573 #ifdef CONFIG_EXT2_FS_POSIX_ACL 574 case Opt_acl: 575 set_opt(opts->s_mount_opt, POSIX_ACL); 576 break; 577 case Opt_noacl: 578 clear_opt(opts->s_mount_opt, POSIX_ACL); 579 break; 580 #else 581 case Opt_acl: 582 case Opt_noacl: 583 ext2_msg(sb, KERN_INFO, 584 "(no)acl options not supported"); 585 break; 586 #endif 587 case Opt_xip: 588 ext2_msg(sb, KERN_INFO, "use dax instead of xip"); 589 set_opt(opts->s_mount_opt, XIP); 590 fallthrough; 591 case Opt_dax: 592 #ifdef CONFIG_FS_DAX 593 ext2_msg(sb, KERN_WARNING, 594 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); 595 set_opt(opts->s_mount_opt, DAX); 596 #else 597 ext2_msg(sb, KERN_INFO, "dax option not supported"); 598 #endif 599 break; 600 601 #if defined(CONFIG_QUOTA) 602 case Opt_quota: 603 case Opt_usrquota: 604 set_opt(opts->s_mount_opt, USRQUOTA); 605 break; 606 607 case Opt_grpquota: 608 set_opt(opts->s_mount_opt, GRPQUOTA); 609 break; 610 #else 611 case Opt_quota: 612 case Opt_usrquota: 613 case Opt_grpquota: 614 ext2_msg(sb, KERN_INFO, 615 "quota operations not supported"); 616 break; 617 #endif 618 619 case Opt_reservation: 620 set_opt(opts->s_mount_opt, RESERVATION); 621 ext2_msg(sb, KERN_INFO, "reservations ON"); 622 break; 623 case Opt_noreservation: 624 clear_opt(opts->s_mount_opt, RESERVATION); 625 ext2_msg(sb, KERN_INFO, "reservations OFF"); 626 break; 627 case Opt_ignore: 628 break; 629 default: 630 return 0; 631 } 632 } 633 return 1; 634 } 635 636 static int ext2_setup_super (struct super_block * sb, 637 struct ext2_super_block * es, 638 int read_only) 639 { 640 int res = 0; 641 struct ext2_sb_info *sbi = EXT2_SB(sb); 642 643 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { 644 ext2_msg(sb, KERN_ERR, 645 "error: revision level too high, " 646 "forcing read-only mode"); 647 res = SB_RDONLY; 648 } 649 if (read_only) 650 return res; 651 if (!(sbi->s_mount_state & EXT2_VALID_FS)) 652 ext2_msg(sb, KERN_WARNING, 653 "warning: mounting unchecked fs, " 654 "running e2fsck is recommended"); 655 else if ((sbi->s_mount_state & EXT2_ERROR_FS)) 656 ext2_msg(sb, KERN_WARNING, 657 "warning: mounting fs with errors, " 658 "running e2fsck is recommended"); 659 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 660 le16_to_cpu(es->s_mnt_count) >= 661 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 662 ext2_msg(sb, KERN_WARNING, 663 "warning: maximal mount count reached, " 664 "running e2fsck is recommended"); 665 else if (le32_to_cpu(es->s_checkinterval) && 666 (le32_to_cpu(es->s_lastcheck) + 667 le32_to_cpu(es->s_checkinterval) <= 668 ktime_get_real_seconds())) 669 ext2_msg(sb, KERN_WARNING, 670 "warning: checktime reached, " 671 "running e2fsck is recommended"); 672 if (!le16_to_cpu(es->s_max_mnt_count)) 673 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); 674 le16_add_cpu(&es->s_mnt_count, 1); 675 if (test_opt (sb, DEBUG)) 676 ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, " 677 "bpg=%lu, ipg=%lu, mo=%04lx]", 678 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, 679 sbi->s_frag_size, 680 sbi->s_groups_count, 681 EXT2_BLOCKS_PER_GROUP(sb), 682 EXT2_INODES_PER_GROUP(sb), 683 sbi->s_mount_opt); 684 return res; 685 } 686 687 static int ext2_check_descriptors(struct super_block *sb) 688 { 689 int i; 690 struct ext2_sb_info *sbi = EXT2_SB(sb); 691 692 ext2_debug ("Checking group descriptors"); 693 694 for (i = 0; i < sbi->s_groups_count; i++) { 695 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL); 696 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i); 697 ext2_fsblk_t last_block = ext2_group_last_block_no(sb, i); 698 699 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || 700 le32_to_cpu(gdp->bg_block_bitmap) > last_block) 701 { 702 ext2_error (sb, "ext2_check_descriptors", 703 "Block bitmap for group %d" 704 " not in group (block %lu)!", 705 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); 706 return 0; 707 } 708 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || 709 le32_to_cpu(gdp->bg_inode_bitmap) > last_block) 710 { 711 ext2_error (sb, "ext2_check_descriptors", 712 "Inode bitmap for group %d" 713 " not in group (block %lu)!", 714 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); 715 return 0; 716 } 717 if (le32_to_cpu(gdp->bg_inode_table) < first_block || 718 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > 719 last_block) 720 { 721 ext2_error (sb, "ext2_check_descriptors", 722 "Inode table for group %d" 723 " not in group (block %lu)!", 724 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); 725 return 0; 726 } 727 } 728 return 1; 729 } 730 731 /* 732 * Maximal file size. There is a direct, and {,double-,triple-}indirect 733 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. 734 * We need to be 1 filesystem block less than the 2^32 sector limit. 735 */ 736 static loff_t ext2_max_size(int bits) 737 { 738 loff_t res = EXT2_NDIR_BLOCKS; 739 int meta_blocks; 740 unsigned int upper_limit; 741 unsigned int ppb = 1 << (bits-2); 742 743 /* This is calculated to be the largest file size for a 744 * dense, file such that the total number of 745 * sectors in the file, including data and all indirect blocks, 746 * does not exceed 2^32 -1 747 * __u32 i_blocks representing the total number of 748 * 512 bytes blocks of the file 749 */ 750 upper_limit = (1LL << 32) - 1; 751 752 /* total blocks in file system block size */ 753 upper_limit >>= (bits - 9); 754 755 /* Compute how many blocks we can address by block tree */ 756 res += 1LL << (bits-2); 757 res += 1LL << (2*(bits-2)); 758 res += 1LL << (3*(bits-2)); 759 /* Does block tree limit file size? */ 760 if (res < upper_limit) 761 goto check_lfs; 762 763 res = upper_limit; 764 /* How many metadata blocks are needed for addressing upper_limit? */ 765 upper_limit -= EXT2_NDIR_BLOCKS; 766 /* indirect blocks */ 767 meta_blocks = 1; 768 upper_limit -= ppb; 769 /* double indirect blocks */ 770 if (upper_limit < ppb * ppb) { 771 meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb); 772 res -= meta_blocks; 773 goto check_lfs; 774 } 775 meta_blocks += 1 + ppb; 776 upper_limit -= ppb * ppb; 777 /* tripple indirect blocks for the rest */ 778 meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb) + 779 DIV_ROUND_UP(upper_limit, ppb*ppb); 780 res -= meta_blocks; 781 check_lfs: 782 res <<= bits; 783 if (res > MAX_LFS_FILESIZE) 784 res = MAX_LFS_FILESIZE; 785 786 return res; 787 } 788 789 static unsigned long descriptor_loc(struct super_block *sb, 790 unsigned long logic_sb_block, 791 int nr) 792 { 793 struct ext2_sb_info *sbi = EXT2_SB(sb); 794 unsigned long bg, first_meta_bg; 795 796 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 797 798 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || 799 nr < first_meta_bg) 800 return (logic_sb_block + nr + 1); 801 bg = sbi->s_desc_per_block * nr; 802 803 return ext2_group_first_block_no(sb, bg) + ext2_bg_has_super(sb, bg); 804 } 805 806 static int ext2_fill_super(struct super_block *sb, void *data, int silent) 807 { 808 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev); 809 struct buffer_head * bh; 810 struct ext2_sb_info * sbi; 811 struct ext2_super_block * es; 812 struct inode *root; 813 unsigned long block; 814 unsigned long sb_block = get_sb_block(&data); 815 unsigned long logic_sb_block; 816 unsigned long offset = 0; 817 unsigned long def_mount_opts; 818 long ret = -ENOMEM; 819 int blocksize = BLOCK_SIZE; 820 int db_count; 821 int i, j; 822 __le32 features; 823 int err; 824 struct ext2_mount_options opts; 825 826 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 827 if (!sbi) 828 goto failed; 829 830 sbi->s_blockgroup_lock = 831 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); 832 if (!sbi->s_blockgroup_lock) { 833 kfree(sbi); 834 goto failed; 835 } 836 sb->s_fs_info = sbi; 837 sbi->s_sb_block = sb_block; 838 sbi->s_daxdev = dax_dev; 839 840 spin_lock_init(&sbi->s_lock); 841 ret = -EINVAL; 842 843 /* 844 * See what the current blocksize for the device is, and 845 * use that as the blocksize. Otherwise (or if the blocksize 846 * is smaller than the default) use the default. 847 * This is important for devices that have a hardware 848 * sectorsize that is larger than the default. 849 */ 850 blocksize = sb_min_blocksize(sb, BLOCK_SIZE); 851 if (!blocksize) { 852 ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); 853 goto failed_sbi; 854 } 855 856 /* 857 * If the superblock doesn't start on a hardware sector boundary, 858 * calculate the offset. 859 */ 860 if (blocksize != BLOCK_SIZE) { 861 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 862 offset = (sb_block*BLOCK_SIZE) % blocksize; 863 } else { 864 logic_sb_block = sb_block; 865 } 866 867 if (!(bh = sb_bread(sb, logic_sb_block))) { 868 ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); 869 goto failed_sbi; 870 } 871 /* 872 * Note: s_es must be initialized as soon as possible because 873 * some ext2 macro-instructions depend on its value 874 */ 875 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 876 sbi->s_es = es; 877 sb->s_magic = le16_to_cpu(es->s_magic); 878 879 if (sb->s_magic != EXT2_SUPER_MAGIC) 880 goto cantfind_ext2; 881 882 opts.s_mount_opt = 0; 883 /* Set defaults before we parse the mount options */ 884 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 885 if (def_mount_opts & EXT2_DEFM_DEBUG) 886 set_opt(opts.s_mount_opt, DEBUG); 887 if (def_mount_opts & EXT2_DEFM_BSDGROUPS) 888 set_opt(opts.s_mount_opt, GRPID); 889 if (def_mount_opts & EXT2_DEFM_UID16) 890 set_opt(opts.s_mount_opt, NO_UID32); 891 #ifdef CONFIG_EXT2_FS_XATTR 892 if (def_mount_opts & EXT2_DEFM_XATTR_USER) 893 set_opt(opts.s_mount_opt, XATTR_USER); 894 #endif 895 #ifdef CONFIG_EXT2_FS_POSIX_ACL 896 if (def_mount_opts & EXT2_DEFM_ACL) 897 set_opt(opts.s_mount_opt, POSIX_ACL); 898 #endif 899 900 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) 901 set_opt(opts.s_mount_opt, ERRORS_PANIC); 902 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) 903 set_opt(opts.s_mount_opt, ERRORS_CONT); 904 else 905 set_opt(opts.s_mount_opt, ERRORS_RO); 906 907 opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); 908 opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); 909 910 set_opt(opts.s_mount_opt, RESERVATION); 911 912 if (!parse_options((char *) data, sb, &opts)) 913 goto failed_mount; 914 915 sbi->s_mount_opt = opts.s_mount_opt; 916 sbi->s_resuid = opts.s_resuid; 917 sbi->s_resgid = opts.s_resgid; 918 919 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | 920 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0); 921 sb->s_iflags |= SB_I_CGROUPWB; 922 923 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && 924 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || 925 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 926 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) 927 ext2_msg(sb, KERN_WARNING, 928 "warning: feature flags set on rev 0 fs, " 929 "running e2fsck is recommended"); 930 /* 931 * Check feature flags regardless of the revision level, since we 932 * previously didn't change the revision level when setting the flags, 933 * so there is a chance incompat flags are set on a rev 0 filesystem. 934 */ 935 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); 936 if (features) { 937 ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " 938 "unsupported optional features (%x)", 939 le32_to_cpu(features)); 940 goto failed_mount; 941 } 942 if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ 943 ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " 944 "unsupported optional features (%x)", 945 le32_to_cpu(features)); 946 goto failed_mount; 947 } 948 949 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); 950 951 if (test_opt(sb, DAX)) { 952 if (!bdev_dax_supported(sb->s_bdev, blocksize)) { 953 ext2_msg(sb, KERN_ERR, 954 "DAX unsupported by block device. Turning off DAX."); 955 clear_opt(sbi->s_mount_opt, DAX); 956 } 957 } 958 959 /* If the blocksize doesn't match, re-read the thing.. */ 960 if (sb->s_blocksize != blocksize) { 961 brelse(bh); 962 963 if (!sb_set_blocksize(sb, blocksize)) { 964 ext2_msg(sb, KERN_ERR, 965 "error: bad blocksize %d", blocksize); 966 goto failed_sbi; 967 } 968 969 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 970 offset = (sb_block*BLOCK_SIZE) % blocksize; 971 bh = sb_bread(sb, logic_sb_block); 972 if(!bh) { 973 ext2_msg(sb, KERN_ERR, "error: couldn't read" 974 "superblock on 2nd try"); 975 goto failed_sbi; 976 } 977 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 978 sbi->s_es = es; 979 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { 980 ext2_msg(sb, KERN_ERR, "error: magic mismatch"); 981 goto failed_mount; 982 } 983 } 984 985 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); 986 sb->s_max_links = EXT2_LINK_MAX; 987 sb->s_time_min = S32_MIN; 988 sb->s_time_max = S32_MAX; 989 990 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { 991 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; 992 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; 993 } else { 994 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 995 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 996 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || 997 !is_power_of_2(sbi->s_inode_size) || 998 (sbi->s_inode_size > blocksize)) { 999 ext2_msg(sb, KERN_ERR, 1000 "error: unsupported inode size: %d", 1001 sbi->s_inode_size); 1002 goto failed_mount; 1003 } 1004 } 1005 1006 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << 1007 le32_to_cpu(es->s_log_frag_size); 1008 if (sbi->s_frag_size == 0) 1009 goto cantfind_ext2; 1010 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; 1011 1012 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 1013 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); 1014 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 1015 1016 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); 1017 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) 1018 goto cantfind_ext2; 1019 sbi->s_itb_per_group = sbi->s_inodes_per_group / 1020 sbi->s_inodes_per_block; 1021 sbi->s_desc_per_block = sb->s_blocksize / 1022 sizeof (struct ext2_group_desc); 1023 sbi->s_sbh = bh; 1024 sbi->s_mount_state = le16_to_cpu(es->s_state); 1025 sbi->s_addr_per_block_bits = 1026 ilog2 (EXT2_ADDR_PER_BLOCK(sb)); 1027 sbi->s_desc_per_block_bits = 1028 ilog2 (EXT2_DESC_PER_BLOCK(sb)); 1029 1030 if (sb->s_magic != EXT2_SUPER_MAGIC) 1031 goto cantfind_ext2; 1032 1033 if (sb->s_blocksize != bh->b_size) { 1034 if (!silent) 1035 ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); 1036 goto failed_mount; 1037 } 1038 1039 if (sb->s_blocksize != sbi->s_frag_size) { 1040 ext2_msg(sb, KERN_ERR, 1041 "error: fragsize %lu != blocksize %lu" 1042 "(not supported yet)", 1043 sbi->s_frag_size, sb->s_blocksize); 1044 goto failed_mount; 1045 } 1046 1047 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { 1048 ext2_msg(sb, KERN_ERR, 1049 "error: #blocks per group too big: %lu", 1050 sbi->s_blocks_per_group); 1051 goto failed_mount; 1052 } 1053 if (sbi->s_frags_per_group > sb->s_blocksize * 8) { 1054 ext2_msg(sb, KERN_ERR, 1055 "error: #fragments per group too big: %lu", 1056 sbi->s_frags_per_group); 1057 goto failed_mount; 1058 } 1059 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { 1060 ext2_msg(sb, KERN_ERR, 1061 "error: #inodes per group too big: %lu", 1062 sbi->s_inodes_per_group); 1063 goto failed_mount; 1064 } 1065 1066 if (EXT2_BLOCKS_PER_GROUP(sb) == 0) 1067 goto cantfind_ext2; 1068 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - 1069 le32_to_cpu(es->s_first_data_block) - 1) 1070 / EXT2_BLOCKS_PER_GROUP(sb)) + 1; 1071 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / 1072 EXT2_DESC_PER_BLOCK(sb); 1073 sbi->s_group_desc = kmalloc_array (db_count, 1074 sizeof(struct buffer_head *), 1075 GFP_KERNEL); 1076 if (sbi->s_group_desc == NULL) { 1077 ret = -ENOMEM; 1078 ext2_msg(sb, KERN_ERR, "error: not enough memory"); 1079 goto failed_mount; 1080 } 1081 bgl_lock_init(sbi->s_blockgroup_lock); 1082 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); 1083 if (!sbi->s_debts) { 1084 ret = -ENOMEM; 1085 ext2_msg(sb, KERN_ERR, "error: not enough memory"); 1086 goto failed_mount_group_desc; 1087 } 1088 for (i = 0; i < db_count; i++) { 1089 block = descriptor_loc(sb, logic_sb_block, i); 1090 sbi->s_group_desc[i] = sb_bread(sb, block); 1091 if (!sbi->s_group_desc[i]) { 1092 for (j = 0; j < i; j++) 1093 brelse (sbi->s_group_desc[j]); 1094 ext2_msg(sb, KERN_ERR, 1095 "error: unable to read group descriptors"); 1096 goto failed_mount_group_desc; 1097 } 1098 } 1099 if (!ext2_check_descriptors (sb)) { 1100 ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); 1101 goto failed_mount2; 1102 } 1103 sbi->s_gdb_count = db_count; 1104 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 1105 spin_lock_init(&sbi->s_next_gen_lock); 1106 1107 /* per fileystem reservation list head & lock */ 1108 spin_lock_init(&sbi->s_rsv_window_lock); 1109 sbi->s_rsv_window_root = RB_ROOT; 1110 /* 1111 * Add a single, static dummy reservation to the start of the 1112 * reservation window list --- it gives us a placeholder for 1113 * append-at-start-of-list which makes the allocation logic 1114 * _much_ simpler. 1115 */ 1116 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; 1117 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; 1118 sbi->s_rsv_window_head.rsv_alloc_hit = 0; 1119 sbi->s_rsv_window_head.rsv_goal_size = 0; 1120 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); 1121 1122 err = percpu_counter_init(&sbi->s_freeblocks_counter, 1123 ext2_count_free_blocks(sb), GFP_KERNEL); 1124 if (!err) { 1125 err = percpu_counter_init(&sbi->s_freeinodes_counter, 1126 ext2_count_free_inodes(sb), GFP_KERNEL); 1127 } 1128 if (!err) { 1129 err = percpu_counter_init(&sbi->s_dirs_counter, 1130 ext2_count_dirs(sb), GFP_KERNEL); 1131 } 1132 if (err) { 1133 ret = err; 1134 ext2_msg(sb, KERN_ERR, "error: insufficient memory"); 1135 goto failed_mount3; 1136 } 1137 1138 #ifdef CONFIG_EXT2_FS_XATTR 1139 sbi->s_ea_block_cache = ext2_xattr_create_cache(); 1140 if (!sbi->s_ea_block_cache) { 1141 ret = -ENOMEM; 1142 ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache"); 1143 goto failed_mount3; 1144 } 1145 #endif 1146 /* 1147 * set up enough so that it can read an inode 1148 */ 1149 sb->s_op = &ext2_sops; 1150 sb->s_export_op = &ext2_export_ops; 1151 sb->s_xattr = ext2_xattr_handlers; 1152 1153 #ifdef CONFIG_QUOTA 1154 sb->dq_op = &dquot_operations; 1155 sb->s_qcop = &ext2_quotactl_ops; 1156 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1157 #endif 1158 1159 root = ext2_iget(sb, EXT2_ROOT_INO); 1160 if (IS_ERR(root)) { 1161 ret = PTR_ERR(root); 1162 goto failed_mount3; 1163 } 1164 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 1165 iput(root); 1166 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); 1167 goto failed_mount3; 1168 } 1169 1170 sb->s_root = d_make_root(root); 1171 if (!sb->s_root) { 1172 ext2_msg(sb, KERN_ERR, "error: get root inode failed"); 1173 ret = -ENOMEM; 1174 goto failed_mount3; 1175 } 1176 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 1177 ext2_msg(sb, KERN_WARNING, 1178 "warning: mounting ext3 filesystem as ext2"); 1179 if (ext2_setup_super (sb, es, sb_rdonly(sb))) 1180 sb->s_flags |= SB_RDONLY; 1181 ext2_write_super(sb); 1182 return 0; 1183 1184 cantfind_ext2: 1185 if (!silent) 1186 ext2_msg(sb, KERN_ERR, 1187 "error: can't find an ext2 filesystem on dev %s.", 1188 sb->s_id); 1189 goto failed_mount; 1190 failed_mount3: 1191 ext2_xattr_destroy_cache(sbi->s_ea_block_cache); 1192 percpu_counter_destroy(&sbi->s_freeblocks_counter); 1193 percpu_counter_destroy(&sbi->s_freeinodes_counter); 1194 percpu_counter_destroy(&sbi->s_dirs_counter); 1195 failed_mount2: 1196 for (i = 0; i < db_count; i++) 1197 brelse(sbi->s_group_desc[i]); 1198 failed_mount_group_desc: 1199 kfree(sbi->s_group_desc); 1200 kfree(sbi->s_debts); 1201 failed_mount: 1202 brelse(bh); 1203 failed_sbi: 1204 sb->s_fs_info = NULL; 1205 kfree(sbi->s_blockgroup_lock); 1206 kfree(sbi); 1207 failed: 1208 fs_put_dax(dax_dev); 1209 return ret; 1210 } 1211 1212 static void ext2_clear_super_error(struct super_block *sb) 1213 { 1214 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; 1215 1216 if (buffer_write_io_error(sbh)) { 1217 /* 1218 * Oh, dear. A previous attempt to write the 1219 * superblock failed. This could happen because the 1220 * USB device was yanked out. Or it could happen to 1221 * be a transient write error and maybe the block will 1222 * be remapped. Nothing we can do but to retry the 1223 * write and hope for the best. 1224 */ 1225 ext2_msg(sb, KERN_ERR, 1226 "previous I/O error to superblock detected"); 1227 clear_buffer_write_io_error(sbh); 1228 set_buffer_uptodate(sbh); 1229 } 1230 } 1231 1232 void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, 1233 int wait) 1234 { 1235 ext2_clear_super_error(sb); 1236 spin_lock(&EXT2_SB(sb)->s_lock); 1237 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); 1238 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); 1239 es->s_wtime = cpu_to_le32(ktime_get_real_seconds()); 1240 /* unlock before we do IO */ 1241 spin_unlock(&EXT2_SB(sb)->s_lock); 1242 mark_buffer_dirty(EXT2_SB(sb)->s_sbh); 1243 if (wait) 1244 sync_dirty_buffer(EXT2_SB(sb)->s_sbh); 1245 } 1246 1247 /* 1248 * In the second extended file system, it is not necessary to 1249 * write the super block since we use a mapping of the 1250 * disk super block in a buffer. 1251 * 1252 * However, this function is still used to set the fs valid 1253 * flags to 0. We need to set this flag to 0 since the fs 1254 * may have been checked while mounted and e2fsck may have 1255 * set s_state to EXT2_VALID_FS after some corrections. 1256 */ 1257 static int ext2_sync_fs(struct super_block *sb, int wait) 1258 { 1259 struct ext2_sb_info *sbi = EXT2_SB(sb); 1260 struct ext2_super_block *es = EXT2_SB(sb)->s_es; 1261 1262 /* 1263 * Write quota structures to quota file, sync_blockdev() will write 1264 * them to disk later 1265 */ 1266 dquot_writeback_dquots(sb, -1); 1267 1268 spin_lock(&sbi->s_lock); 1269 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { 1270 ext2_debug("setting valid to 0\n"); 1271 es->s_state &= cpu_to_le16(~EXT2_VALID_FS); 1272 } 1273 spin_unlock(&sbi->s_lock); 1274 ext2_sync_super(sb, es, wait); 1275 return 0; 1276 } 1277 1278 static int ext2_freeze(struct super_block *sb) 1279 { 1280 struct ext2_sb_info *sbi = EXT2_SB(sb); 1281 1282 /* 1283 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared 1284 * because we have unattached inodes and thus filesystem is not fully 1285 * consistent. 1286 */ 1287 if (atomic_long_read(&sb->s_remove_count)) { 1288 ext2_sync_fs(sb, 1); 1289 return 0; 1290 } 1291 /* Set EXT2_FS_VALID flag */ 1292 spin_lock(&sbi->s_lock); 1293 sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state); 1294 spin_unlock(&sbi->s_lock); 1295 ext2_sync_super(sb, sbi->s_es, 1); 1296 1297 return 0; 1298 } 1299 1300 static int ext2_unfreeze(struct super_block *sb) 1301 { 1302 /* Just write sb to clear EXT2_VALID_FS flag */ 1303 ext2_write_super(sb); 1304 1305 return 0; 1306 } 1307 1308 static void ext2_write_super(struct super_block *sb) 1309 { 1310 if (!sb_rdonly(sb)) 1311 ext2_sync_fs(sb, 1); 1312 } 1313 1314 static int ext2_remount (struct super_block * sb, int * flags, char * data) 1315 { 1316 struct ext2_sb_info * sbi = EXT2_SB(sb); 1317 struct ext2_super_block * es; 1318 struct ext2_mount_options new_opts; 1319 int err; 1320 1321 sync_filesystem(sb); 1322 1323 spin_lock(&sbi->s_lock); 1324 new_opts.s_mount_opt = sbi->s_mount_opt; 1325 new_opts.s_resuid = sbi->s_resuid; 1326 new_opts.s_resgid = sbi->s_resgid; 1327 spin_unlock(&sbi->s_lock); 1328 1329 if (!parse_options(data, sb, &new_opts)) 1330 return -EINVAL; 1331 1332 spin_lock(&sbi->s_lock); 1333 es = sbi->s_es; 1334 if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) { 1335 ext2_msg(sb, KERN_WARNING, "warning: refusing change of " 1336 "dax flag with busy inodes while remounting"); 1337 new_opts.s_mount_opt ^= EXT2_MOUNT_DAX; 1338 } 1339 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) 1340 goto out_set; 1341 if (*flags & SB_RDONLY) { 1342 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || 1343 !(sbi->s_mount_state & EXT2_VALID_FS)) 1344 goto out_set; 1345 1346 /* 1347 * OK, we are remounting a valid rw partition rdonly, so set 1348 * the rdonly flag and then mark the partition as valid again. 1349 */ 1350 es->s_state = cpu_to_le16(sbi->s_mount_state); 1351 es->s_mtime = cpu_to_le32(ktime_get_real_seconds()); 1352 spin_unlock(&sbi->s_lock); 1353 1354 err = dquot_suspend(sb, -1); 1355 if (err < 0) 1356 return err; 1357 1358 ext2_sync_super(sb, es, 1); 1359 } else { 1360 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, 1361 ~EXT2_FEATURE_RO_COMPAT_SUPP); 1362 if (ret) { 1363 spin_unlock(&sbi->s_lock); 1364 ext2_msg(sb, KERN_WARNING, 1365 "warning: couldn't remount RDWR because of " 1366 "unsupported optional features (%x).", 1367 le32_to_cpu(ret)); 1368 return -EROFS; 1369 } 1370 /* 1371 * Mounting a RDONLY partition read-write, so reread and 1372 * store the current valid flag. (It may have been changed 1373 * by e2fsck since we originally mounted the partition.) 1374 */ 1375 sbi->s_mount_state = le16_to_cpu(es->s_state); 1376 if (!ext2_setup_super (sb, es, 0)) 1377 sb->s_flags &= ~SB_RDONLY; 1378 spin_unlock(&sbi->s_lock); 1379 1380 ext2_write_super(sb); 1381 1382 dquot_resume(sb, -1); 1383 } 1384 1385 spin_lock(&sbi->s_lock); 1386 out_set: 1387 sbi->s_mount_opt = new_opts.s_mount_opt; 1388 sbi->s_resuid = new_opts.s_resuid; 1389 sbi->s_resgid = new_opts.s_resgid; 1390 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | 1391 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0); 1392 spin_unlock(&sbi->s_lock); 1393 1394 return 0; 1395 } 1396 1397 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) 1398 { 1399 struct super_block *sb = dentry->d_sb; 1400 struct ext2_sb_info *sbi = EXT2_SB(sb); 1401 struct ext2_super_block *es = sbi->s_es; 1402 u64 fsid; 1403 1404 spin_lock(&sbi->s_lock); 1405 1406 if (test_opt (sb, MINIX_DF)) 1407 sbi->s_overhead_last = 0; 1408 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { 1409 unsigned long i, overhead = 0; 1410 smp_rmb(); 1411 1412 /* 1413 * Compute the overhead (FS structures). This is constant 1414 * for a given filesystem unless the number of block groups 1415 * changes so we cache the previous value until it does. 1416 */ 1417 1418 /* 1419 * All of the blocks before first_data_block are 1420 * overhead 1421 */ 1422 overhead = le32_to_cpu(es->s_first_data_block); 1423 1424 /* 1425 * Add the overhead attributed to the superblock and 1426 * block group descriptors. If the sparse superblocks 1427 * feature is turned on, then not all groups have this. 1428 */ 1429 for (i = 0; i < sbi->s_groups_count; i++) 1430 overhead += ext2_bg_has_super(sb, i) + 1431 ext2_bg_num_gdb(sb, i); 1432 1433 /* 1434 * Every block group has an inode bitmap, a block 1435 * bitmap, and an inode table. 1436 */ 1437 overhead += (sbi->s_groups_count * 1438 (2 + sbi->s_itb_per_group)); 1439 sbi->s_overhead_last = overhead; 1440 smp_wmb(); 1441 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); 1442 } 1443 1444 buf->f_type = EXT2_SUPER_MAGIC; 1445 buf->f_bsize = sb->s_blocksize; 1446 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; 1447 buf->f_bfree = ext2_count_free_blocks(sb); 1448 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); 1449 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); 1450 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) 1451 buf->f_bavail = 0; 1452 buf->f_files = le32_to_cpu(es->s_inodes_count); 1453 buf->f_ffree = ext2_count_free_inodes(sb); 1454 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); 1455 buf->f_namelen = EXT2_NAME_LEN; 1456 fsid = le64_to_cpup((void *)es->s_uuid) ^ 1457 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 1458 buf->f_fsid = u64_to_fsid(fsid); 1459 spin_unlock(&sbi->s_lock); 1460 return 0; 1461 } 1462 1463 static struct dentry *ext2_mount(struct file_system_type *fs_type, 1464 int flags, const char *dev_name, void *data) 1465 { 1466 return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super); 1467 } 1468 1469 #ifdef CONFIG_QUOTA 1470 1471 /* Read data from quotafile - avoid pagecache and such because we cannot afford 1472 * acquiring the locks... As quota files are never truncated and quota code 1473 * itself serializes the operations (and no one else should touch the files) 1474 * we don't have to be afraid of races */ 1475 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, 1476 size_t len, loff_t off) 1477 { 1478 struct inode *inode = sb_dqopt(sb)->files[type]; 1479 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1480 int err = 0; 1481 int offset = off & (sb->s_blocksize - 1); 1482 int tocopy; 1483 size_t toread; 1484 struct buffer_head tmp_bh; 1485 struct buffer_head *bh; 1486 loff_t i_size = i_size_read(inode); 1487 1488 if (off > i_size) 1489 return 0; 1490 if (off+len > i_size) 1491 len = i_size-off; 1492 toread = len; 1493 while (toread > 0) { 1494 tocopy = sb->s_blocksize - offset < toread ? 1495 sb->s_blocksize - offset : toread; 1496 1497 tmp_bh.b_state = 0; 1498 tmp_bh.b_size = sb->s_blocksize; 1499 err = ext2_get_block(inode, blk, &tmp_bh, 0); 1500 if (err < 0) 1501 return err; 1502 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 1503 memset(data, 0, tocopy); 1504 else { 1505 bh = sb_bread(sb, tmp_bh.b_blocknr); 1506 if (!bh) 1507 return -EIO; 1508 memcpy(data, bh->b_data+offset, tocopy); 1509 brelse(bh); 1510 } 1511 offset = 0; 1512 toread -= tocopy; 1513 data += tocopy; 1514 blk++; 1515 } 1516 return len; 1517 } 1518 1519 /* Write to quotafile */ 1520 static ssize_t ext2_quota_write(struct super_block *sb, int type, 1521 const char *data, size_t len, loff_t off) 1522 { 1523 struct inode *inode = sb_dqopt(sb)->files[type]; 1524 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1525 int err = 0; 1526 int offset = off & (sb->s_blocksize - 1); 1527 int tocopy; 1528 size_t towrite = len; 1529 struct buffer_head tmp_bh; 1530 struct buffer_head *bh; 1531 1532 while (towrite > 0) { 1533 tocopy = sb->s_blocksize - offset < towrite ? 1534 sb->s_blocksize - offset : towrite; 1535 1536 tmp_bh.b_state = 0; 1537 tmp_bh.b_size = sb->s_blocksize; 1538 err = ext2_get_block(inode, blk, &tmp_bh, 1); 1539 if (err < 0) 1540 goto out; 1541 if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) 1542 bh = sb_bread(sb, tmp_bh.b_blocknr); 1543 else 1544 bh = sb_getblk(sb, tmp_bh.b_blocknr); 1545 if (unlikely(!bh)) { 1546 err = -EIO; 1547 goto out; 1548 } 1549 lock_buffer(bh); 1550 memcpy(bh->b_data+offset, data, tocopy); 1551 flush_dcache_page(bh->b_page); 1552 set_buffer_uptodate(bh); 1553 mark_buffer_dirty(bh); 1554 unlock_buffer(bh); 1555 brelse(bh); 1556 offset = 0; 1557 towrite -= tocopy; 1558 data += tocopy; 1559 blk++; 1560 } 1561 out: 1562 if (len == towrite) 1563 return err; 1564 if (inode->i_size < off+len-towrite) 1565 i_size_write(inode, off+len-towrite); 1566 inode_inc_iversion(inode); 1567 inode->i_mtime = inode->i_ctime = current_time(inode); 1568 mark_inode_dirty(inode); 1569 return len - towrite; 1570 } 1571 1572 static int ext2_quota_on(struct super_block *sb, int type, int format_id, 1573 const struct path *path) 1574 { 1575 int err; 1576 struct inode *inode; 1577 1578 err = dquot_quota_on(sb, type, format_id, path); 1579 if (err) 1580 return err; 1581 1582 inode = d_inode(path->dentry); 1583 inode_lock(inode); 1584 EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL; 1585 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, 1586 S_NOATIME | S_IMMUTABLE); 1587 inode_unlock(inode); 1588 mark_inode_dirty(inode); 1589 1590 return 0; 1591 } 1592 1593 static int ext2_quota_off(struct super_block *sb, int type) 1594 { 1595 struct inode *inode = sb_dqopt(sb)->files[type]; 1596 int err; 1597 1598 if (!inode || !igrab(inode)) 1599 goto out; 1600 1601 err = dquot_quota_off(sb, type); 1602 if (err) 1603 goto out_put; 1604 1605 inode_lock(inode); 1606 EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL); 1607 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); 1608 inode_unlock(inode); 1609 mark_inode_dirty(inode); 1610 out_put: 1611 iput(inode); 1612 return err; 1613 out: 1614 return dquot_quota_off(sb, type); 1615 } 1616 1617 #endif 1618 1619 static struct file_system_type ext2_fs_type = { 1620 .owner = THIS_MODULE, 1621 .name = "ext2", 1622 .mount = ext2_mount, 1623 .kill_sb = kill_block_super, 1624 .fs_flags = FS_REQUIRES_DEV, 1625 }; 1626 MODULE_ALIAS_FS("ext2"); 1627 1628 static int __init init_ext2_fs(void) 1629 { 1630 int err; 1631 1632 err = init_inodecache(); 1633 if (err) 1634 return err; 1635 err = register_filesystem(&ext2_fs_type); 1636 if (err) 1637 goto out; 1638 return 0; 1639 out: 1640 destroy_inodecache(); 1641 return err; 1642 } 1643 1644 static void __exit exit_ext2_fs(void) 1645 { 1646 unregister_filesystem(&ext2_fs_type); 1647 destroy_inodecache(); 1648 } 1649 1650 MODULE_AUTHOR("Remy Card and others"); 1651 MODULE_DESCRIPTION("Second Extended Filesystem"); 1652 MODULE_LICENSE("GPL"); 1653 module_init(init_ext2_fs) 1654 module_exit(exit_ext2_fs) 1655