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 if (sbi->s_group_desc[i]) 166 brelse (sbi->s_group_desc[i]); 167 kfree(sbi->s_group_desc); 168 kfree(sbi->s_debts); 169 percpu_counter_destroy(&sbi->s_freeblocks_counter); 170 percpu_counter_destroy(&sbi->s_freeinodes_counter); 171 percpu_counter_destroy(&sbi->s_dirs_counter); 172 brelse (sbi->s_sbh); 173 sb->s_fs_info = NULL; 174 kfree(sbi->s_blockgroup_lock); 175 fs_put_dax(sbi->s_daxdev); 176 kfree(sbi); 177 } 178 179 static struct kmem_cache * ext2_inode_cachep; 180 181 static struct inode *ext2_alloc_inode(struct super_block *sb) 182 { 183 struct ext2_inode_info *ei; 184 ei = kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL); 185 if (!ei) 186 return NULL; 187 ei->i_block_alloc_info = NULL; 188 inode_set_iversion(&ei->vfs_inode, 1); 189 #ifdef CONFIG_QUOTA 190 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot)); 191 #endif 192 193 return &ei->vfs_inode; 194 } 195 196 static void ext2_free_in_core_inode(struct inode *inode) 197 { 198 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode)); 199 } 200 201 static void init_once(void *foo) 202 { 203 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo; 204 205 rwlock_init(&ei->i_meta_lock); 206 #ifdef CONFIG_EXT2_FS_XATTR 207 init_rwsem(&ei->xattr_sem); 208 #endif 209 mutex_init(&ei->truncate_mutex); 210 #ifdef CONFIG_FS_DAX 211 init_rwsem(&ei->dax_sem); 212 #endif 213 inode_init_once(&ei->vfs_inode); 214 } 215 216 static int __init init_inodecache(void) 217 { 218 ext2_inode_cachep = kmem_cache_create_usercopy("ext2_inode_cache", 219 sizeof(struct ext2_inode_info), 0, 220 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| 221 SLAB_ACCOUNT), 222 offsetof(struct ext2_inode_info, i_data), 223 sizeof_field(struct ext2_inode_info, i_data), 224 init_once); 225 if (ext2_inode_cachep == NULL) 226 return -ENOMEM; 227 return 0; 228 } 229 230 static void destroy_inodecache(void) 231 { 232 /* 233 * Make sure all delayed rcu free inodes are flushed before we 234 * destroy cache. 235 */ 236 rcu_barrier(); 237 kmem_cache_destroy(ext2_inode_cachep); 238 } 239 240 static int ext2_show_options(struct seq_file *seq, struct dentry *root) 241 { 242 struct super_block *sb = root->d_sb; 243 struct ext2_sb_info *sbi = EXT2_SB(sb); 244 struct ext2_super_block *es = sbi->s_es; 245 unsigned long def_mount_opts; 246 247 spin_lock(&sbi->s_lock); 248 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 249 250 if (sbi->s_sb_block != 1) 251 seq_printf(seq, ",sb=%lu", sbi->s_sb_block); 252 if (test_opt(sb, MINIX_DF)) 253 seq_puts(seq, ",minixdf"); 254 if (test_opt(sb, GRPID)) 255 seq_puts(seq, ",grpid"); 256 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS)) 257 seq_puts(seq, ",nogrpid"); 258 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) || 259 le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) { 260 seq_printf(seq, ",resuid=%u", 261 from_kuid_munged(&init_user_ns, sbi->s_resuid)); 262 } 263 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) || 264 le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) { 265 seq_printf(seq, ",resgid=%u", 266 from_kgid_munged(&init_user_ns, sbi->s_resgid)); 267 } 268 if (test_opt(sb, ERRORS_RO)) { 269 int def_errors = le16_to_cpu(es->s_errors); 270 271 if (def_errors == EXT2_ERRORS_PANIC || 272 def_errors == EXT2_ERRORS_CONTINUE) { 273 seq_puts(seq, ",errors=remount-ro"); 274 } 275 } 276 if (test_opt(sb, ERRORS_CONT)) 277 seq_puts(seq, ",errors=continue"); 278 if (test_opt(sb, ERRORS_PANIC)) 279 seq_puts(seq, ",errors=panic"); 280 if (test_opt(sb, NO_UID32)) 281 seq_puts(seq, ",nouid32"); 282 if (test_opt(sb, DEBUG)) 283 seq_puts(seq, ",debug"); 284 if (test_opt(sb, OLDALLOC)) 285 seq_puts(seq, ",oldalloc"); 286 287 #ifdef CONFIG_EXT2_FS_XATTR 288 if (test_opt(sb, XATTR_USER)) 289 seq_puts(seq, ",user_xattr"); 290 if (!test_opt(sb, XATTR_USER) && 291 (def_mount_opts & EXT2_DEFM_XATTR_USER)) { 292 seq_puts(seq, ",nouser_xattr"); 293 } 294 #endif 295 296 #ifdef CONFIG_EXT2_FS_POSIX_ACL 297 if (test_opt(sb, POSIX_ACL)) 298 seq_puts(seq, ",acl"); 299 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL)) 300 seq_puts(seq, ",noacl"); 301 #endif 302 303 if (test_opt(sb, NOBH)) 304 seq_puts(seq, ",nobh"); 305 306 if (test_opt(sb, USRQUOTA)) 307 seq_puts(seq, ",usrquota"); 308 309 if (test_opt(sb, GRPQUOTA)) 310 seq_puts(seq, ",grpquota"); 311 312 if (test_opt(sb, XIP)) 313 seq_puts(seq, ",xip"); 314 315 if (test_opt(sb, DAX)) 316 seq_puts(seq, ",dax"); 317 318 if (!test_opt(sb, RESERVATION)) 319 seq_puts(seq, ",noreservation"); 320 321 spin_unlock(&sbi->s_lock); 322 return 0; 323 } 324 325 #ifdef CONFIG_QUOTA 326 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); 327 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); 328 static int ext2_quota_on(struct super_block *sb, int type, int format_id, 329 const struct path *path); 330 static struct dquot **ext2_get_dquots(struct inode *inode) 331 { 332 return EXT2_I(inode)->i_dquot; 333 } 334 335 static const struct quotactl_ops ext2_quotactl_ops = { 336 .quota_on = ext2_quota_on, 337 .quota_off = ext2_quota_off, 338 .quota_sync = dquot_quota_sync, 339 .get_state = dquot_get_state, 340 .set_info = dquot_set_dqinfo, 341 .get_dqblk = dquot_get_dqblk, 342 .set_dqblk = dquot_set_dqblk, 343 .get_nextdqblk = dquot_get_next_dqblk, 344 }; 345 #endif 346 347 static const struct super_operations ext2_sops = { 348 .alloc_inode = ext2_alloc_inode, 349 .free_inode = ext2_free_in_core_inode, 350 .write_inode = ext2_write_inode, 351 .evict_inode = ext2_evict_inode, 352 .put_super = ext2_put_super, 353 .sync_fs = ext2_sync_fs, 354 .freeze_fs = ext2_freeze, 355 .unfreeze_fs = ext2_unfreeze, 356 .statfs = ext2_statfs, 357 .remount_fs = ext2_remount, 358 .show_options = ext2_show_options, 359 #ifdef CONFIG_QUOTA 360 .quota_read = ext2_quota_read, 361 .quota_write = ext2_quota_write, 362 .get_dquots = ext2_get_dquots, 363 #endif 364 }; 365 366 static struct inode *ext2_nfs_get_inode(struct super_block *sb, 367 u64 ino, u32 generation) 368 { 369 struct inode *inode; 370 371 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) 372 return ERR_PTR(-ESTALE); 373 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) 374 return ERR_PTR(-ESTALE); 375 376 /* 377 * ext2_iget isn't quite right if the inode is currently unallocated! 378 * However ext2_iget currently does appropriate checks to handle stale 379 * inodes so everything is OK. 380 */ 381 inode = ext2_iget(sb, ino); 382 if (IS_ERR(inode)) 383 return ERR_CAST(inode); 384 if (generation && inode->i_generation != generation) { 385 /* we didn't find the right inode.. */ 386 iput(inode); 387 return ERR_PTR(-ESTALE); 388 } 389 return inode; 390 } 391 392 static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid, 393 int fh_len, int fh_type) 394 { 395 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 396 ext2_nfs_get_inode); 397 } 398 399 static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid, 400 int fh_len, int fh_type) 401 { 402 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 403 ext2_nfs_get_inode); 404 } 405 406 static const struct export_operations ext2_export_ops = { 407 .fh_to_dentry = ext2_fh_to_dentry, 408 .fh_to_parent = ext2_fh_to_parent, 409 .get_parent = ext2_get_parent, 410 }; 411 412 static unsigned long get_sb_block(void **data) 413 { 414 unsigned long sb_block; 415 char *options = (char *) *data; 416 417 if (!options || strncmp(options, "sb=", 3) != 0) 418 return 1; /* Default location */ 419 options += 3; 420 sb_block = simple_strtoul(options, &options, 0); 421 if (*options && *options != ',') { 422 printk("EXT2-fs: Invalid sb specification: %s\n", 423 (char *) *data); 424 return 1; 425 } 426 if (*options == ',') 427 options++; 428 *data = (void *) options; 429 return sb_block; 430 } 431 432 enum { 433 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 434 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, 435 Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug, 436 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, 437 Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota, 438 Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation 439 }; 440 441 static const match_table_t tokens = { 442 {Opt_bsd_df, "bsddf"}, 443 {Opt_minix_df, "minixdf"}, 444 {Opt_grpid, "grpid"}, 445 {Opt_grpid, "bsdgroups"}, 446 {Opt_nogrpid, "nogrpid"}, 447 {Opt_nogrpid, "sysvgroups"}, 448 {Opt_resgid, "resgid=%u"}, 449 {Opt_resuid, "resuid=%u"}, 450 {Opt_sb, "sb=%u"}, 451 {Opt_err_cont, "errors=continue"}, 452 {Opt_err_panic, "errors=panic"}, 453 {Opt_err_ro, "errors=remount-ro"}, 454 {Opt_nouid32, "nouid32"}, 455 {Opt_nocheck, "check=none"}, 456 {Opt_nocheck, "nocheck"}, 457 {Opt_debug, "debug"}, 458 {Opt_oldalloc, "oldalloc"}, 459 {Opt_orlov, "orlov"}, 460 {Opt_nobh, "nobh"}, 461 {Opt_user_xattr, "user_xattr"}, 462 {Opt_nouser_xattr, "nouser_xattr"}, 463 {Opt_acl, "acl"}, 464 {Opt_noacl, "noacl"}, 465 {Opt_xip, "xip"}, 466 {Opt_dax, "dax"}, 467 {Opt_grpquota, "grpquota"}, 468 {Opt_ignore, "noquota"}, 469 {Opt_quota, "quota"}, 470 {Opt_usrquota, "usrquota"}, 471 {Opt_reservation, "reservation"}, 472 {Opt_noreservation, "noreservation"}, 473 {Opt_err, NULL} 474 }; 475 476 static int parse_options(char *options, struct super_block *sb, 477 struct ext2_mount_options *opts) 478 { 479 char *p; 480 substring_t args[MAX_OPT_ARGS]; 481 int option; 482 kuid_t uid; 483 kgid_t gid; 484 485 if (!options) 486 return 1; 487 488 while ((p = strsep (&options, ",")) != NULL) { 489 int token; 490 if (!*p) 491 continue; 492 493 token = match_token(p, tokens, args); 494 switch (token) { 495 case Opt_bsd_df: 496 clear_opt (opts->s_mount_opt, MINIX_DF); 497 break; 498 case Opt_minix_df: 499 set_opt (opts->s_mount_opt, MINIX_DF); 500 break; 501 case Opt_grpid: 502 set_opt (opts->s_mount_opt, GRPID); 503 break; 504 case Opt_nogrpid: 505 clear_opt (opts->s_mount_opt, GRPID); 506 break; 507 case Opt_resuid: 508 if (match_int(&args[0], &option)) 509 return 0; 510 uid = make_kuid(current_user_ns(), option); 511 if (!uid_valid(uid)) { 512 ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option); 513 return 0; 514 515 } 516 opts->s_resuid = uid; 517 break; 518 case Opt_resgid: 519 if (match_int(&args[0], &option)) 520 return 0; 521 gid = make_kgid(current_user_ns(), option); 522 if (!gid_valid(gid)) { 523 ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option); 524 return 0; 525 } 526 opts->s_resgid = gid; 527 break; 528 case Opt_sb: 529 /* handled by get_sb_block() instead of here */ 530 /* *sb_block = match_int(&args[0]); */ 531 break; 532 case Opt_err_panic: 533 clear_opt (opts->s_mount_opt, ERRORS_CONT); 534 clear_opt (opts->s_mount_opt, ERRORS_RO); 535 set_opt (opts->s_mount_opt, ERRORS_PANIC); 536 break; 537 case Opt_err_ro: 538 clear_opt (opts->s_mount_opt, ERRORS_CONT); 539 clear_opt (opts->s_mount_opt, ERRORS_PANIC); 540 set_opt (opts->s_mount_opt, ERRORS_RO); 541 break; 542 case Opt_err_cont: 543 clear_opt (opts->s_mount_opt, ERRORS_RO); 544 clear_opt (opts->s_mount_opt, ERRORS_PANIC); 545 set_opt (opts->s_mount_opt, ERRORS_CONT); 546 break; 547 case Opt_nouid32: 548 set_opt (opts->s_mount_opt, NO_UID32); 549 break; 550 case Opt_nocheck: 551 ext2_msg(sb, KERN_WARNING, 552 "Option nocheck/check=none is deprecated and" 553 " will be removed in June 2020."); 554 clear_opt (opts->s_mount_opt, CHECK); 555 break; 556 case Opt_debug: 557 set_opt (opts->s_mount_opt, DEBUG); 558 break; 559 case Opt_oldalloc: 560 set_opt (opts->s_mount_opt, OLDALLOC); 561 break; 562 case Opt_orlov: 563 clear_opt (opts->s_mount_opt, OLDALLOC); 564 break; 565 case Opt_nobh: 566 set_opt (opts->s_mount_opt, NOBH); 567 break; 568 #ifdef CONFIG_EXT2_FS_XATTR 569 case Opt_user_xattr: 570 set_opt (opts->s_mount_opt, XATTR_USER); 571 break; 572 case Opt_nouser_xattr: 573 clear_opt (opts->s_mount_opt, XATTR_USER); 574 break; 575 #else 576 case Opt_user_xattr: 577 case Opt_nouser_xattr: 578 ext2_msg(sb, KERN_INFO, "(no)user_xattr options" 579 "not supported"); 580 break; 581 #endif 582 #ifdef CONFIG_EXT2_FS_POSIX_ACL 583 case Opt_acl: 584 set_opt(opts->s_mount_opt, POSIX_ACL); 585 break; 586 case Opt_noacl: 587 clear_opt(opts->s_mount_opt, POSIX_ACL); 588 break; 589 #else 590 case Opt_acl: 591 case Opt_noacl: 592 ext2_msg(sb, KERN_INFO, 593 "(no)acl options not supported"); 594 break; 595 #endif 596 case Opt_xip: 597 ext2_msg(sb, KERN_INFO, "use dax instead of xip"); 598 set_opt(opts->s_mount_opt, XIP); 599 /* Fall through */ 600 case Opt_dax: 601 #ifdef CONFIG_FS_DAX 602 ext2_msg(sb, KERN_WARNING, 603 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); 604 set_opt(opts->s_mount_opt, DAX); 605 #else 606 ext2_msg(sb, KERN_INFO, "dax option not supported"); 607 #endif 608 break; 609 610 #if defined(CONFIG_QUOTA) 611 case Opt_quota: 612 case Opt_usrquota: 613 set_opt(opts->s_mount_opt, USRQUOTA); 614 break; 615 616 case Opt_grpquota: 617 set_opt(opts->s_mount_opt, GRPQUOTA); 618 break; 619 #else 620 case Opt_quota: 621 case Opt_usrquota: 622 case Opt_grpquota: 623 ext2_msg(sb, KERN_INFO, 624 "quota operations not supported"); 625 break; 626 #endif 627 628 case Opt_reservation: 629 set_opt(opts->s_mount_opt, RESERVATION); 630 ext2_msg(sb, KERN_INFO, "reservations ON"); 631 break; 632 case Opt_noreservation: 633 clear_opt(opts->s_mount_opt, RESERVATION); 634 ext2_msg(sb, KERN_INFO, "reservations OFF"); 635 break; 636 case Opt_ignore: 637 break; 638 default: 639 return 0; 640 } 641 } 642 return 1; 643 } 644 645 static int ext2_setup_super (struct super_block * sb, 646 struct ext2_super_block * es, 647 int read_only) 648 { 649 int res = 0; 650 struct ext2_sb_info *sbi = EXT2_SB(sb); 651 652 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { 653 ext2_msg(sb, KERN_ERR, 654 "error: revision level too high, " 655 "forcing read-only mode"); 656 res = SB_RDONLY; 657 } 658 if (read_only) 659 return res; 660 if (!(sbi->s_mount_state & EXT2_VALID_FS)) 661 ext2_msg(sb, KERN_WARNING, 662 "warning: mounting unchecked fs, " 663 "running e2fsck is recommended"); 664 else if ((sbi->s_mount_state & EXT2_ERROR_FS)) 665 ext2_msg(sb, KERN_WARNING, 666 "warning: mounting fs with errors, " 667 "running e2fsck is recommended"); 668 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 669 le16_to_cpu(es->s_mnt_count) >= 670 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 671 ext2_msg(sb, KERN_WARNING, 672 "warning: maximal mount count reached, " 673 "running e2fsck is recommended"); 674 else if (le32_to_cpu(es->s_checkinterval) && 675 (le32_to_cpu(es->s_lastcheck) + 676 le32_to_cpu(es->s_checkinterval) <= 677 ktime_get_real_seconds())) 678 ext2_msg(sb, KERN_WARNING, 679 "warning: checktime reached, " 680 "running e2fsck is recommended"); 681 if (!le16_to_cpu(es->s_max_mnt_count)) 682 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); 683 le16_add_cpu(&es->s_mnt_count, 1); 684 if (test_opt (sb, DEBUG)) 685 ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, " 686 "bpg=%lu, ipg=%lu, mo=%04lx]", 687 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, 688 sbi->s_frag_size, 689 sbi->s_groups_count, 690 EXT2_BLOCKS_PER_GROUP(sb), 691 EXT2_INODES_PER_GROUP(sb), 692 sbi->s_mount_opt); 693 return res; 694 } 695 696 static int ext2_check_descriptors(struct super_block *sb) 697 { 698 int i; 699 struct ext2_sb_info *sbi = EXT2_SB(sb); 700 701 ext2_debug ("Checking group descriptors"); 702 703 for (i = 0; i < sbi->s_groups_count; i++) { 704 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL); 705 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i); 706 ext2_fsblk_t last_block; 707 708 if (i == sbi->s_groups_count - 1) 709 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; 710 else 711 last_block = first_block + 712 (EXT2_BLOCKS_PER_GROUP(sb) - 1); 713 714 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || 715 le32_to_cpu(gdp->bg_block_bitmap) > last_block) 716 { 717 ext2_error (sb, "ext2_check_descriptors", 718 "Block bitmap for group %d" 719 " not in group (block %lu)!", 720 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); 721 return 0; 722 } 723 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || 724 le32_to_cpu(gdp->bg_inode_bitmap) > last_block) 725 { 726 ext2_error (sb, "ext2_check_descriptors", 727 "Inode bitmap for group %d" 728 " not in group (block %lu)!", 729 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); 730 return 0; 731 } 732 if (le32_to_cpu(gdp->bg_inode_table) < first_block || 733 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > 734 last_block) 735 { 736 ext2_error (sb, "ext2_check_descriptors", 737 "Inode table for group %d" 738 " not in group (block %lu)!", 739 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); 740 return 0; 741 } 742 } 743 return 1; 744 } 745 746 /* 747 * Maximal file size. There is a direct, and {,double-,triple-}indirect 748 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. 749 * We need to be 1 filesystem block less than the 2^32 sector limit. 750 */ 751 static loff_t ext2_max_size(int bits) 752 { 753 loff_t res = EXT2_NDIR_BLOCKS; 754 int meta_blocks; 755 unsigned int upper_limit; 756 unsigned int ppb = 1 << (bits-2); 757 758 /* This is calculated to be the largest file size for a 759 * dense, file such that the total number of 760 * sectors in the file, including data and all indirect blocks, 761 * does not exceed 2^32 -1 762 * __u32 i_blocks representing the total number of 763 * 512 bytes blocks of the file 764 */ 765 upper_limit = (1LL << 32) - 1; 766 767 /* total blocks in file system block size */ 768 upper_limit >>= (bits - 9); 769 770 /* Compute how many blocks we can address by block tree */ 771 res += 1LL << (bits-2); 772 res += 1LL << (2*(bits-2)); 773 res += 1LL << (3*(bits-2)); 774 /* Does block tree limit file size? */ 775 if (res < upper_limit) 776 goto check_lfs; 777 778 res = upper_limit; 779 /* How many metadata blocks are needed for addressing upper_limit? */ 780 upper_limit -= EXT2_NDIR_BLOCKS; 781 /* indirect blocks */ 782 meta_blocks = 1; 783 upper_limit -= ppb; 784 /* double indirect blocks */ 785 if (upper_limit < ppb * ppb) { 786 meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb); 787 res -= meta_blocks; 788 goto check_lfs; 789 } 790 meta_blocks += 1 + ppb; 791 upper_limit -= ppb * ppb; 792 /* tripple indirect blocks for the rest */ 793 meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb) + 794 DIV_ROUND_UP(upper_limit, ppb*ppb); 795 res -= meta_blocks; 796 check_lfs: 797 res <<= bits; 798 if (res > MAX_LFS_FILESIZE) 799 res = MAX_LFS_FILESIZE; 800 801 return res; 802 } 803 804 static unsigned long descriptor_loc(struct super_block *sb, 805 unsigned long logic_sb_block, 806 int nr) 807 { 808 struct ext2_sb_info *sbi = EXT2_SB(sb); 809 unsigned long bg, first_meta_bg; 810 int has_super = 0; 811 812 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 813 814 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || 815 nr < first_meta_bg) 816 return (logic_sb_block + nr + 1); 817 bg = sbi->s_desc_per_block * nr; 818 if (ext2_bg_has_super(sb, bg)) 819 has_super = 1; 820 821 return ext2_group_first_block_no(sb, bg) + has_super; 822 } 823 824 static int ext2_fill_super(struct super_block *sb, void *data, int silent) 825 { 826 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev); 827 struct buffer_head * bh; 828 struct ext2_sb_info * sbi; 829 struct ext2_super_block * es; 830 struct inode *root; 831 unsigned long block; 832 unsigned long sb_block = get_sb_block(&data); 833 unsigned long logic_sb_block; 834 unsigned long offset = 0; 835 unsigned long def_mount_opts; 836 long ret = -ENOMEM; 837 int blocksize = BLOCK_SIZE; 838 int db_count; 839 int i, j; 840 __le32 features; 841 int err; 842 struct ext2_mount_options opts; 843 844 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 845 if (!sbi) 846 goto failed; 847 848 sbi->s_blockgroup_lock = 849 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); 850 if (!sbi->s_blockgroup_lock) { 851 kfree(sbi); 852 goto failed; 853 } 854 sb->s_fs_info = sbi; 855 sbi->s_sb_block = sb_block; 856 sbi->s_daxdev = dax_dev; 857 858 spin_lock_init(&sbi->s_lock); 859 ret = -EINVAL; 860 861 /* 862 * See what the current blocksize for the device is, and 863 * use that as the blocksize. Otherwise (or if the blocksize 864 * is smaller than the default) use the default. 865 * This is important for devices that have a hardware 866 * sectorsize that is larger than the default. 867 */ 868 blocksize = sb_min_blocksize(sb, BLOCK_SIZE); 869 if (!blocksize) { 870 ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); 871 goto failed_sbi; 872 } 873 874 /* 875 * If the superblock doesn't start on a hardware sector boundary, 876 * calculate the offset. 877 */ 878 if (blocksize != BLOCK_SIZE) { 879 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 880 offset = (sb_block*BLOCK_SIZE) % blocksize; 881 } else { 882 logic_sb_block = sb_block; 883 } 884 885 if (!(bh = sb_bread(sb, logic_sb_block))) { 886 ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); 887 goto failed_sbi; 888 } 889 /* 890 * Note: s_es must be initialized as soon as possible because 891 * some ext2 macro-instructions depend on its value 892 */ 893 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 894 sbi->s_es = es; 895 sb->s_magic = le16_to_cpu(es->s_magic); 896 897 if (sb->s_magic != EXT2_SUPER_MAGIC) 898 goto cantfind_ext2; 899 900 opts.s_mount_opt = 0; 901 /* Set defaults before we parse the mount options */ 902 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 903 if (def_mount_opts & EXT2_DEFM_DEBUG) 904 set_opt(opts.s_mount_opt, DEBUG); 905 if (def_mount_opts & EXT2_DEFM_BSDGROUPS) 906 set_opt(opts.s_mount_opt, GRPID); 907 if (def_mount_opts & EXT2_DEFM_UID16) 908 set_opt(opts.s_mount_opt, NO_UID32); 909 #ifdef CONFIG_EXT2_FS_XATTR 910 if (def_mount_opts & EXT2_DEFM_XATTR_USER) 911 set_opt(opts.s_mount_opt, XATTR_USER); 912 #endif 913 #ifdef CONFIG_EXT2_FS_POSIX_ACL 914 if (def_mount_opts & EXT2_DEFM_ACL) 915 set_opt(opts.s_mount_opt, POSIX_ACL); 916 #endif 917 918 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) 919 set_opt(opts.s_mount_opt, ERRORS_PANIC); 920 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) 921 set_opt(opts.s_mount_opt, ERRORS_CONT); 922 else 923 set_opt(opts.s_mount_opt, ERRORS_RO); 924 925 opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); 926 opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); 927 928 set_opt(opts.s_mount_opt, RESERVATION); 929 930 if (!parse_options((char *) data, sb, &opts)) 931 goto failed_mount; 932 933 sbi->s_mount_opt = opts.s_mount_opt; 934 sbi->s_resuid = opts.s_resuid; 935 sbi->s_resgid = opts.s_resgid; 936 937 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | 938 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0); 939 sb->s_iflags |= SB_I_CGROUPWB; 940 941 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && 942 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || 943 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 944 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) 945 ext2_msg(sb, KERN_WARNING, 946 "warning: feature flags set on rev 0 fs, " 947 "running e2fsck is recommended"); 948 /* 949 * Check feature flags regardless of the revision level, since we 950 * previously didn't change the revision level when setting the flags, 951 * so there is a chance incompat flags are set on a rev 0 filesystem. 952 */ 953 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); 954 if (features) { 955 ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " 956 "unsupported optional features (%x)", 957 le32_to_cpu(features)); 958 goto failed_mount; 959 } 960 if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ 961 ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " 962 "unsupported optional features (%x)", 963 le32_to_cpu(features)); 964 goto failed_mount; 965 } 966 967 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); 968 969 if (test_opt(sb, DAX)) { 970 if (!bdev_dax_supported(sb->s_bdev, blocksize)) { 971 ext2_msg(sb, KERN_ERR, 972 "DAX unsupported by block device. Turning off DAX."); 973 clear_opt(sbi->s_mount_opt, DAX); 974 } 975 } 976 977 /* If the blocksize doesn't match, re-read the thing.. */ 978 if (sb->s_blocksize != blocksize) { 979 brelse(bh); 980 981 if (!sb_set_blocksize(sb, blocksize)) { 982 ext2_msg(sb, KERN_ERR, 983 "error: bad blocksize %d", blocksize); 984 goto failed_sbi; 985 } 986 987 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 988 offset = (sb_block*BLOCK_SIZE) % blocksize; 989 bh = sb_bread(sb, logic_sb_block); 990 if(!bh) { 991 ext2_msg(sb, KERN_ERR, "error: couldn't read" 992 "superblock on 2nd try"); 993 goto failed_sbi; 994 } 995 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 996 sbi->s_es = es; 997 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { 998 ext2_msg(sb, KERN_ERR, "error: magic mismatch"); 999 goto failed_mount; 1000 } 1001 } 1002 1003 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); 1004 sb->s_max_links = EXT2_LINK_MAX; 1005 1006 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { 1007 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; 1008 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; 1009 } else { 1010 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 1011 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 1012 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || 1013 !is_power_of_2(sbi->s_inode_size) || 1014 (sbi->s_inode_size > blocksize)) { 1015 ext2_msg(sb, KERN_ERR, 1016 "error: unsupported inode size: %d", 1017 sbi->s_inode_size); 1018 goto failed_mount; 1019 } 1020 } 1021 1022 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << 1023 le32_to_cpu(es->s_log_frag_size); 1024 if (sbi->s_frag_size == 0) 1025 goto cantfind_ext2; 1026 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; 1027 1028 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 1029 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); 1030 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 1031 1032 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); 1033 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) 1034 goto cantfind_ext2; 1035 sbi->s_itb_per_group = sbi->s_inodes_per_group / 1036 sbi->s_inodes_per_block; 1037 sbi->s_desc_per_block = sb->s_blocksize / 1038 sizeof (struct ext2_group_desc); 1039 sbi->s_sbh = bh; 1040 sbi->s_mount_state = le16_to_cpu(es->s_state); 1041 sbi->s_addr_per_block_bits = 1042 ilog2 (EXT2_ADDR_PER_BLOCK(sb)); 1043 sbi->s_desc_per_block_bits = 1044 ilog2 (EXT2_DESC_PER_BLOCK(sb)); 1045 1046 if (sb->s_magic != EXT2_SUPER_MAGIC) 1047 goto cantfind_ext2; 1048 1049 if (sb->s_blocksize != bh->b_size) { 1050 if (!silent) 1051 ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); 1052 goto failed_mount; 1053 } 1054 1055 if (sb->s_blocksize != sbi->s_frag_size) { 1056 ext2_msg(sb, KERN_ERR, 1057 "error: fragsize %lu != blocksize %lu" 1058 "(not supported yet)", 1059 sbi->s_frag_size, sb->s_blocksize); 1060 goto failed_mount; 1061 } 1062 1063 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { 1064 ext2_msg(sb, KERN_ERR, 1065 "error: #blocks per group too big: %lu", 1066 sbi->s_blocks_per_group); 1067 goto failed_mount; 1068 } 1069 if (sbi->s_frags_per_group > sb->s_blocksize * 8) { 1070 ext2_msg(sb, KERN_ERR, 1071 "error: #fragments per group too big: %lu", 1072 sbi->s_frags_per_group); 1073 goto failed_mount; 1074 } 1075 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { 1076 ext2_msg(sb, KERN_ERR, 1077 "error: #inodes per group too big: %lu", 1078 sbi->s_inodes_per_group); 1079 goto failed_mount; 1080 } 1081 1082 if (EXT2_BLOCKS_PER_GROUP(sb) == 0) 1083 goto cantfind_ext2; 1084 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - 1085 le32_to_cpu(es->s_first_data_block) - 1) 1086 / EXT2_BLOCKS_PER_GROUP(sb)) + 1; 1087 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / 1088 EXT2_DESC_PER_BLOCK(sb); 1089 sbi->s_group_desc = kmalloc_array (db_count, 1090 sizeof(struct buffer_head *), 1091 GFP_KERNEL); 1092 if (sbi->s_group_desc == NULL) { 1093 ret = -ENOMEM; 1094 ext2_msg(sb, KERN_ERR, "error: not enough memory"); 1095 goto failed_mount; 1096 } 1097 bgl_lock_init(sbi->s_blockgroup_lock); 1098 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); 1099 if (!sbi->s_debts) { 1100 ret = -ENOMEM; 1101 ext2_msg(sb, KERN_ERR, "error: not enough memory"); 1102 goto failed_mount_group_desc; 1103 } 1104 for (i = 0; i < db_count; i++) { 1105 block = descriptor_loc(sb, logic_sb_block, i); 1106 sbi->s_group_desc[i] = sb_bread(sb, block); 1107 if (!sbi->s_group_desc[i]) { 1108 for (j = 0; j < i; j++) 1109 brelse (sbi->s_group_desc[j]); 1110 ext2_msg(sb, KERN_ERR, 1111 "error: unable to read group descriptors"); 1112 goto failed_mount_group_desc; 1113 } 1114 } 1115 if (!ext2_check_descriptors (sb)) { 1116 ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); 1117 goto failed_mount2; 1118 } 1119 sbi->s_gdb_count = db_count; 1120 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 1121 spin_lock_init(&sbi->s_next_gen_lock); 1122 1123 /* per fileystem reservation list head & lock */ 1124 spin_lock_init(&sbi->s_rsv_window_lock); 1125 sbi->s_rsv_window_root = RB_ROOT; 1126 /* 1127 * Add a single, static dummy reservation to the start of the 1128 * reservation window list --- it gives us a placeholder for 1129 * append-at-start-of-list which makes the allocation logic 1130 * _much_ simpler. 1131 */ 1132 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; 1133 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; 1134 sbi->s_rsv_window_head.rsv_alloc_hit = 0; 1135 sbi->s_rsv_window_head.rsv_goal_size = 0; 1136 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); 1137 1138 err = percpu_counter_init(&sbi->s_freeblocks_counter, 1139 ext2_count_free_blocks(sb), GFP_KERNEL); 1140 if (!err) { 1141 err = percpu_counter_init(&sbi->s_freeinodes_counter, 1142 ext2_count_free_inodes(sb), GFP_KERNEL); 1143 } 1144 if (!err) { 1145 err = percpu_counter_init(&sbi->s_dirs_counter, 1146 ext2_count_dirs(sb), GFP_KERNEL); 1147 } 1148 if (err) { 1149 ext2_msg(sb, KERN_ERR, "error: insufficient memory"); 1150 goto failed_mount3; 1151 } 1152 1153 #ifdef CONFIG_EXT2_FS_XATTR 1154 sbi->s_ea_block_cache = ext2_xattr_create_cache(); 1155 if (!sbi->s_ea_block_cache) { 1156 ret = -ENOMEM; 1157 ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache"); 1158 goto failed_mount3; 1159 } 1160 #endif 1161 /* 1162 * set up enough so that it can read an inode 1163 */ 1164 sb->s_op = &ext2_sops; 1165 sb->s_export_op = &ext2_export_ops; 1166 sb->s_xattr = ext2_xattr_handlers; 1167 1168 #ifdef CONFIG_QUOTA 1169 sb->dq_op = &dquot_operations; 1170 sb->s_qcop = &ext2_quotactl_ops; 1171 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1172 #endif 1173 1174 root = ext2_iget(sb, EXT2_ROOT_INO); 1175 if (IS_ERR(root)) { 1176 ret = PTR_ERR(root); 1177 goto failed_mount3; 1178 } 1179 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 1180 iput(root); 1181 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); 1182 goto failed_mount3; 1183 } 1184 1185 sb->s_root = d_make_root(root); 1186 if (!sb->s_root) { 1187 ext2_msg(sb, KERN_ERR, "error: get root inode failed"); 1188 ret = -ENOMEM; 1189 goto failed_mount3; 1190 } 1191 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 1192 ext2_msg(sb, KERN_WARNING, 1193 "warning: mounting ext3 filesystem as ext2"); 1194 if (ext2_setup_super (sb, es, sb_rdonly(sb))) 1195 sb->s_flags |= SB_RDONLY; 1196 ext2_write_super(sb); 1197 return 0; 1198 1199 cantfind_ext2: 1200 if (!silent) 1201 ext2_msg(sb, KERN_ERR, 1202 "error: can't find an ext2 filesystem on dev %s.", 1203 sb->s_id); 1204 goto failed_mount; 1205 failed_mount3: 1206 ext2_xattr_destroy_cache(sbi->s_ea_block_cache); 1207 percpu_counter_destroy(&sbi->s_freeblocks_counter); 1208 percpu_counter_destroy(&sbi->s_freeinodes_counter); 1209 percpu_counter_destroy(&sbi->s_dirs_counter); 1210 failed_mount2: 1211 for (i = 0; i < db_count; i++) 1212 brelse(sbi->s_group_desc[i]); 1213 failed_mount_group_desc: 1214 kfree(sbi->s_group_desc); 1215 kfree(sbi->s_debts); 1216 failed_mount: 1217 brelse(bh); 1218 failed_sbi: 1219 sb->s_fs_info = NULL; 1220 kfree(sbi->s_blockgroup_lock); 1221 kfree(sbi); 1222 failed: 1223 fs_put_dax(dax_dev); 1224 return ret; 1225 } 1226 1227 static void ext2_clear_super_error(struct super_block *sb) 1228 { 1229 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; 1230 1231 if (buffer_write_io_error(sbh)) { 1232 /* 1233 * Oh, dear. A previous attempt to write the 1234 * superblock failed. This could happen because the 1235 * USB device was yanked out. Or it could happen to 1236 * be a transient write error and maybe the block will 1237 * be remapped. Nothing we can do but to retry the 1238 * write and hope for the best. 1239 */ 1240 ext2_msg(sb, KERN_ERR, 1241 "previous I/O error to superblock detected"); 1242 clear_buffer_write_io_error(sbh); 1243 set_buffer_uptodate(sbh); 1244 } 1245 } 1246 1247 void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, 1248 int wait) 1249 { 1250 ext2_clear_super_error(sb); 1251 spin_lock(&EXT2_SB(sb)->s_lock); 1252 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); 1253 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); 1254 es->s_wtime = cpu_to_le32(ktime_get_real_seconds()); 1255 /* unlock before we do IO */ 1256 spin_unlock(&EXT2_SB(sb)->s_lock); 1257 mark_buffer_dirty(EXT2_SB(sb)->s_sbh); 1258 if (wait) 1259 sync_dirty_buffer(EXT2_SB(sb)->s_sbh); 1260 } 1261 1262 /* 1263 * In the second extended file system, it is not necessary to 1264 * write the super block since we use a mapping of the 1265 * disk super block in a buffer. 1266 * 1267 * However, this function is still used to set the fs valid 1268 * flags to 0. We need to set this flag to 0 since the fs 1269 * may have been checked while mounted and e2fsck may have 1270 * set s_state to EXT2_VALID_FS after some corrections. 1271 */ 1272 static int ext2_sync_fs(struct super_block *sb, int wait) 1273 { 1274 struct ext2_sb_info *sbi = EXT2_SB(sb); 1275 struct ext2_super_block *es = EXT2_SB(sb)->s_es; 1276 1277 /* 1278 * Write quota structures to quota file, sync_blockdev() will write 1279 * them to disk later 1280 */ 1281 dquot_writeback_dquots(sb, -1); 1282 1283 spin_lock(&sbi->s_lock); 1284 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { 1285 ext2_debug("setting valid to 0\n"); 1286 es->s_state &= cpu_to_le16(~EXT2_VALID_FS); 1287 } 1288 spin_unlock(&sbi->s_lock); 1289 ext2_sync_super(sb, es, wait); 1290 return 0; 1291 } 1292 1293 static int ext2_freeze(struct super_block *sb) 1294 { 1295 struct ext2_sb_info *sbi = EXT2_SB(sb); 1296 1297 /* 1298 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared 1299 * because we have unattached inodes and thus filesystem is not fully 1300 * consistent. 1301 */ 1302 if (atomic_long_read(&sb->s_remove_count)) { 1303 ext2_sync_fs(sb, 1); 1304 return 0; 1305 } 1306 /* Set EXT2_FS_VALID flag */ 1307 spin_lock(&sbi->s_lock); 1308 sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state); 1309 spin_unlock(&sbi->s_lock); 1310 ext2_sync_super(sb, sbi->s_es, 1); 1311 1312 return 0; 1313 } 1314 1315 static int ext2_unfreeze(struct super_block *sb) 1316 { 1317 /* Just write sb to clear EXT2_VALID_FS flag */ 1318 ext2_write_super(sb); 1319 1320 return 0; 1321 } 1322 1323 static void ext2_write_super(struct super_block *sb) 1324 { 1325 if (!sb_rdonly(sb)) 1326 ext2_sync_fs(sb, 1); 1327 } 1328 1329 static int ext2_remount (struct super_block * sb, int * flags, char * data) 1330 { 1331 struct ext2_sb_info * sbi = EXT2_SB(sb); 1332 struct ext2_super_block * es; 1333 struct ext2_mount_options new_opts; 1334 int err; 1335 1336 sync_filesystem(sb); 1337 1338 spin_lock(&sbi->s_lock); 1339 new_opts.s_mount_opt = sbi->s_mount_opt; 1340 new_opts.s_resuid = sbi->s_resuid; 1341 new_opts.s_resgid = sbi->s_resgid; 1342 spin_unlock(&sbi->s_lock); 1343 1344 if (!parse_options(data, sb, &new_opts)) 1345 return -EINVAL; 1346 1347 spin_lock(&sbi->s_lock); 1348 es = sbi->s_es; 1349 if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) { 1350 ext2_msg(sb, KERN_WARNING, "warning: refusing change of " 1351 "dax flag with busy inodes while remounting"); 1352 new_opts.s_mount_opt ^= EXT2_MOUNT_DAX; 1353 } 1354 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) 1355 goto out_set; 1356 if (*flags & SB_RDONLY) { 1357 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || 1358 !(sbi->s_mount_state & EXT2_VALID_FS)) 1359 goto out_set; 1360 1361 /* 1362 * OK, we are remounting a valid rw partition rdonly, so set 1363 * the rdonly flag and then mark the partition as valid again. 1364 */ 1365 es->s_state = cpu_to_le16(sbi->s_mount_state); 1366 es->s_mtime = cpu_to_le32(ktime_get_real_seconds()); 1367 spin_unlock(&sbi->s_lock); 1368 1369 err = dquot_suspend(sb, -1); 1370 if (err < 0) 1371 return err; 1372 1373 ext2_sync_super(sb, es, 1); 1374 } else { 1375 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, 1376 ~EXT2_FEATURE_RO_COMPAT_SUPP); 1377 if (ret) { 1378 spin_unlock(&sbi->s_lock); 1379 ext2_msg(sb, KERN_WARNING, 1380 "warning: couldn't remount RDWR because of " 1381 "unsupported optional features (%x).", 1382 le32_to_cpu(ret)); 1383 return -EROFS; 1384 } 1385 /* 1386 * Mounting a RDONLY partition read-write, so reread and 1387 * store the current valid flag. (It may have been changed 1388 * by e2fsck since we originally mounted the partition.) 1389 */ 1390 sbi->s_mount_state = le16_to_cpu(es->s_state); 1391 if (!ext2_setup_super (sb, es, 0)) 1392 sb->s_flags &= ~SB_RDONLY; 1393 spin_unlock(&sbi->s_lock); 1394 1395 ext2_write_super(sb); 1396 1397 dquot_resume(sb, -1); 1398 } 1399 1400 spin_lock(&sbi->s_lock); 1401 out_set: 1402 sbi->s_mount_opt = new_opts.s_mount_opt; 1403 sbi->s_resuid = new_opts.s_resuid; 1404 sbi->s_resgid = new_opts.s_resgid; 1405 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | 1406 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0); 1407 spin_unlock(&sbi->s_lock); 1408 1409 return 0; 1410 } 1411 1412 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) 1413 { 1414 struct super_block *sb = dentry->d_sb; 1415 struct ext2_sb_info *sbi = EXT2_SB(sb); 1416 struct ext2_super_block *es = sbi->s_es; 1417 u64 fsid; 1418 1419 spin_lock(&sbi->s_lock); 1420 1421 if (test_opt (sb, MINIX_DF)) 1422 sbi->s_overhead_last = 0; 1423 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { 1424 unsigned long i, overhead = 0; 1425 smp_rmb(); 1426 1427 /* 1428 * Compute the overhead (FS structures). This is constant 1429 * for a given filesystem unless the number of block groups 1430 * changes so we cache the previous value until it does. 1431 */ 1432 1433 /* 1434 * All of the blocks before first_data_block are 1435 * overhead 1436 */ 1437 overhead = le32_to_cpu(es->s_first_data_block); 1438 1439 /* 1440 * Add the overhead attributed to the superblock and 1441 * block group descriptors. If the sparse superblocks 1442 * feature is turned on, then not all groups have this. 1443 */ 1444 for (i = 0; i < sbi->s_groups_count; i++) 1445 overhead += ext2_bg_has_super(sb, i) + 1446 ext2_bg_num_gdb(sb, i); 1447 1448 /* 1449 * Every block group has an inode bitmap, a block 1450 * bitmap, and an inode table. 1451 */ 1452 overhead += (sbi->s_groups_count * 1453 (2 + sbi->s_itb_per_group)); 1454 sbi->s_overhead_last = overhead; 1455 smp_wmb(); 1456 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); 1457 } 1458 1459 buf->f_type = EXT2_SUPER_MAGIC; 1460 buf->f_bsize = sb->s_blocksize; 1461 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; 1462 buf->f_bfree = ext2_count_free_blocks(sb); 1463 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); 1464 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); 1465 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) 1466 buf->f_bavail = 0; 1467 buf->f_files = le32_to_cpu(es->s_inodes_count); 1468 buf->f_ffree = ext2_count_free_inodes(sb); 1469 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); 1470 buf->f_namelen = EXT2_NAME_LEN; 1471 fsid = le64_to_cpup((void *)es->s_uuid) ^ 1472 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 1473 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 1474 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 1475 spin_unlock(&sbi->s_lock); 1476 return 0; 1477 } 1478 1479 static struct dentry *ext2_mount(struct file_system_type *fs_type, 1480 int flags, const char *dev_name, void *data) 1481 { 1482 return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super); 1483 } 1484 1485 #ifdef CONFIG_QUOTA 1486 1487 /* Read data from quotafile - avoid pagecache and such because we cannot afford 1488 * acquiring the locks... As quota files are never truncated and quota code 1489 * itself serializes the operations (and no one else should touch the files) 1490 * we don't have to be afraid of races */ 1491 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, 1492 size_t len, loff_t off) 1493 { 1494 struct inode *inode = sb_dqopt(sb)->files[type]; 1495 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1496 int err = 0; 1497 int offset = off & (sb->s_blocksize - 1); 1498 int tocopy; 1499 size_t toread; 1500 struct buffer_head tmp_bh; 1501 struct buffer_head *bh; 1502 loff_t i_size = i_size_read(inode); 1503 1504 if (off > i_size) 1505 return 0; 1506 if (off+len > i_size) 1507 len = i_size-off; 1508 toread = len; 1509 while (toread > 0) { 1510 tocopy = sb->s_blocksize - offset < toread ? 1511 sb->s_blocksize - offset : toread; 1512 1513 tmp_bh.b_state = 0; 1514 tmp_bh.b_size = sb->s_blocksize; 1515 err = ext2_get_block(inode, blk, &tmp_bh, 0); 1516 if (err < 0) 1517 return err; 1518 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 1519 memset(data, 0, tocopy); 1520 else { 1521 bh = sb_bread(sb, tmp_bh.b_blocknr); 1522 if (!bh) 1523 return -EIO; 1524 memcpy(data, bh->b_data+offset, tocopy); 1525 brelse(bh); 1526 } 1527 offset = 0; 1528 toread -= tocopy; 1529 data += tocopy; 1530 blk++; 1531 } 1532 return len; 1533 } 1534 1535 /* Write to quotafile */ 1536 static ssize_t ext2_quota_write(struct super_block *sb, int type, 1537 const char *data, size_t len, loff_t off) 1538 { 1539 struct inode *inode = sb_dqopt(sb)->files[type]; 1540 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1541 int err = 0; 1542 int offset = off & (sb->s_blocksize - 1); 1543 int tocopy; 1544 size_t towrite = len; 1545 struct buffer_head tmp_bh; 1546 struct buffer_head *bh; 1547 1548 while (towrite > 0) { 1549 tocopy = sb->s_blocksize - offset < towrite ? 1550 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