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_nocheck, 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_nocheck, "check=none"}, 455 {Opt_nocheck, "nocheck"}, 456 {Opt_debug, "debug"}, 457 {Opt_oldalloc, "oldalloc"}, 458 {Opt_orlov, "orlov"}, 459 {Opt_nobh, "nobh"}, 460 {Opt_user_xattr, "user_xattr"}, 461 {Opt_nouser_xattr, "nouser_xattr"}, 462 {Opt_acl, "acl"}, 463 {Opt_noacl, "noacl"}, 464 {Opt_xip, "xip"}, 465 {Opt_dax, "dax"}, 466 {Opt_grpquota, "grpquota"}, 467 {Opt_ignore, "noquota"}, 468 {Opt_quota, "quota"}, 469 {Opt_usrquota, "usrquota"}, 470 {Opt_reservation, "reservation"}, 471 {Opt_noreservation, "noreservation"}, 472 {Opt_err, NULL} 473 }; 474 475 static int parse_options(char *options, struct super_block *sb, 476 struct ext2_mount_options *opts) 477 { 478 char *p; 479 substring_t args[MAX_OPT_ARGS]; 480 int option; 481 kuid_t uid; 482 kgid_t gid; 483 484 if (!options) 485 return 1; 486 487 while ((p = strsep (&options, ",")) != NULL) { 488 int token; 489 if (!*p) 490 continue; 491 492 token = match_token(p, tokens, args); 493 switch (token) { 494 case Opt_bsd_df: 495 clear_opt (opts->s_mount_opt, MINIX_DF); 496 break; 497 case Opt_minix_df: 498 set_opt (opts->s_mount_opt, MINIX_DF); 499 break; 500 case Opt_grpid: 501 set_opt (opts->s_mount_opt, GRPID); 502 break; 503 case Opt_nogrpid: 504 clear_opt (opts->s_mount_opt, GRPID); 505 break; 506 case Opt_resuid: 507 if (match_int(&args[0], &option)) 508 return 0; 509 uid = make_kuid(current_user_ns(), option); 510 if (!uid_valid(uid)) { 511 ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option); 512 return 0; 513 514 } 515 opts->s_resuid = uid; 516 break; 517 case Opt_resgid: 518 if (match_int(&args[0], &option)) 519 return 0; 520 gid = make_kgid(current_user_ns(), option); 521 if (!gid_valid(gid)) { 522 ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option); 523 return 0; 524 } 525 opts->s_resgid = gid; 526 break; 527 case Opt_sb: 528 /* handled by get_sb_block() instead of here */ 529 /* *sb_block = match_int(&args[0]); */ 530 break; 531 case Opt_err_panic: 532 clear_opt (opts->s_mount_opt, ERRORS_CONT); 533 clear_opt (opts->s_mount_opt, ERRORS_RO); 534 set_opt (opts->s_mount_opt, ERRORS_PANIC); 535 break; 536 case Opt_err_ro: 537 clear_opt (opts->s_mount_opt, ERRORS_CONT); 538 clear_opt (opts->s_mount_opt, ERRORS_PANIC); 539 set_opt (opts->s_mount_opt, ERRORS_RO); 540 break; 541 case Opt_err_cont: 542 clear_opt (opts->s_mount_opt, ERRORS_RO); 543 clear_opt (opts->s_mount_opt, ERRORS_PANIC); 544 set_opt (opts->s_mount_opt, ERRORS_CONT); 545 break; 546 case Opt_nouid32: 547 set_opt (opts->s_mount_opt, NO_UID32); 548 break; 549 case Opt_nocheck: 550 ext2_msg(sb, KERN_WARNING, 551 "Option nocheck/check=none is deprecated and" 552 " will be removed in June 2020."); 553 clear_opt (opts->s_mount_opt, CHECK); 554 break; 555 case Opt_debug: 556 set_opt (opts->s_mount_opt, DEBUG); 557 break; 558 case Opt_oldalloc: 559 set_opt (opts->s_mount_opt, OLDALLOC); 560 break; 561 case Opt_orlov: 562 clear_opt (opts->s_mount_opt, OLDALLOC); 563 break; 564 case Opt_nobh: 565 set_opt (opts->s_mount_opt, NOBH); 566 break; 567 #ifdef CONFIG_EXT2_FS_XATTR 568 case Opt_user_xattr: 569 set_opt (opts->s_mount_opt, XATTR_USER); 570 break; 571 case Opt_nouser_xattr: 572 clear_opt (opts->s_mount_opt, XATTR_USER); 573 break; 574 #else 575 case Opt_user_xattr: 576 case Opt_nouser_xattr: 577 ext2_msg(sb, KERN_INFO, "(no)user_xattr options" 578 "not supported"); 579 break; 580 #endif 581 #ifdef CONFIG_EXT2_FS_POSIX_ACL 582 case Opt_acl: 583 set_opt(opts->s_mount_opt, POSIX_ACL); 584 break; 585 case Opt_noacl: 586 clear_opt(opts->s_mount_opt, POSIX_ACL); 587 break; 588 #else 589 case Opt_acl: 590 case Opt_noacl: 591 ext2_msg(sb, KERN_INFO, 592 "(no)acl options not supported"); 593 break; 594 #endif 595 case Opt_xip: 596 ext2_msg(sb, KERN_INFO, "use dax instead of xip"); 597 set_opt(opts->s_mount_opt, XIP); 598 /* Fall through */ 599 case Opt_dax: 600 #ifdef CONFIG_FS_DAX 601 ext2_msg(sb, KERN_WARNING, 602 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); 603 set_opt(opts->s_mount_opt, DAX); 604 #else 605 ext2_msg(sb, KERN_INFO, "dax option not supported"); 606 #endif 607 break; 608 609 #if defined(CONFIG_QUOTA) 610 case Opt_quota: 611 case Opt_usrquota: 612 set_opt(opts->s_mount_opt, USRQUOTA); 613 break; 614 615 case Opt_grpquota: 616 set_opt(opts->s_mount_opt, GRPQUOTA); 617 break; 618 #else 619 case Opt_quota: 620 case Opt_usrquota: 621 case Opt_grpquota: 622 ext2_msg(sb, KERN_INFO, 623 "quota operations not supported"); 624 break; 625 #endif 626 627 case Opt_reservation: 628 set_opt(opts->s_mount_opt, RESERVATION); 629 ext2_msg(sb, KERN_INFO, "reservations ON"); 630 break; 631 case Opt_noreservation: 632 clear_opt(opts->s_mount_opt, RESERVATION); 633 ext2_msg(sb, KERN_INFO, "reservations OFF"); 634 break; 635 case Opt_ignore: 636 break; 637 default: 638 return 0; 639 } 640 } 641 return 1; 642 } 643 644 static int ext2_setup_super (struct super_block * sb, 645 struct ext2_super_block * es, 646 int read_only) 647 { 648 int res = 0; 649 struct ext2_sb_info *sbi = EXT2_SB(sb); 650 651 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { 652 ext2_msg(sb, KERN_ERR, 653 "error: revision level too high, " 654 "forcing read-only mode"); 655 res = SB_RDONLY; 656 } 657 if (read_only) 658 return res; 659 if (!(sbi->s_mount_state & EXT2_VALID_FS)) 660 ext2_msg(sb, KERN_WARNING, 661 "warning: mounting unchecked fs, " 662 "running e2fsck is recommended"); 663 else if ((sbi->s_mount_state & EXT2_ERROR_FS)) 664 ext2_msg(sb, KERN_WARNING, 665 "warning: mounting fs with errors, " 666 "running e2fsck is recommended"); 667 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 668 le16_to_cpu(es->s_mnt_count) >= 669 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 670 ext2_msg(sb, KERN_WARNING, 671 "warning: maximal mount count reached, " 672 "running e2fsck is recommended"); 673 else if (le32_to_cpu(es->s_checkinterval) && 674 (le32_to_cpu(es->s_lastcheck) + 675 le32_to_cpu(es->s_checkinterval) <= 676 ktime_get_real_seconds())) 677 ext2_msg(sb, KERN_WARNING, 678 "warning: checktime reached, " 679 "running e2fsck is recommended"); 680 if (!le16_to_cpu(es->s_max_mnt_count)) 681 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); 682 le16_add_cpu(&es->s_mnt_count, 1); 683 if (test_opt (sb, DEBUG)) 684 ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, " 685 "bpg=%lu, ipg=%lu, mo=%04lx]", 686 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, 687 sbi->s_frag_size, 688 sbi->s_groups_count, 689 EXT2_BLOCKS_PER_GROUP(sb), 690 EXT2_INODES_PER_GROUP(sb), 691 sbi->s_mount_opt); 692 return res; 693 } 694 695 static int ext2_check_descriptors(struct super_block *sb) 696 { 697 int i; 698 struct ext2_sb_info *sbi = EXT2_SB(sb); 699 700 ext2_debug ("Checking group descriptors"); 701 702 for (i = 0; i < sbi->s_groups_count; i++) { 703 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL); 704 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i); 705 ext2_fsblk_t last_block; 706 707 if (i == sbi->s_groups_count - 1) 708 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; 709 else 710 last_block = first_block + 711 (EXT2_BLOCKS_PER_GROUP(sb) - 1); 712 713 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || 714 le32_to_cpu(gdp->bg_block_bitmap) > last_block) 715 { 716 ext2_error (sb, "ext2_check_descriptors", 717 "Block bitmap for group %d" 718 " not in group (block %lu)!", 719 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); 720 return 0; 721 } 722 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || 723 le32_to_cpu(gdp->bg_inode_bitmap) > last_block) 724 { 725 ext2_error (sb, "ext2_check_descriptors", 726 "Inode bitmap for group %d" 727 " not in group (block %lu)!", 728 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); 729 return 0; 730 } 731 if (le32_to_cpu(gdp->bg_inode_table) < first_block || 732 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > 733 last_block) 734 { 735 ext2_error (sb, "ext2_check_descriptors", 736 "Inode table for group %d" 737 " not in group (block %lu)!", 738 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); 739 return 0; 740 } 741 } 742 return 1; 743 } 744 745 /* 746 * Maximal file size. There is a direct, and {,double-,triple-}indirect 747 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. 748 * We need to be 1 filesystem block less than the 2^32 sector limit. 749 */ 750 static loff_t ext2_max_size(int bits) 751 { 752 loff_t res = EXT2_NDIR_BLOCKS; 753 int meta_blocks; 754 unsigned int upper_limit; 755 unsigned int ppb = 1 << (bits-2); 756 757 /* This is calculated to be the largest file size for a 758 * dense, file such that the total number of 759 * sectors in the file, including data and all indirect blocks, 760 * does not exceed 2^32 -1 761 * __u32 i_blocks representing the total number of 762 * 512 bytes blocks of the file 763 */ 764 upper_limit = (1LL << 32) - 1; 765 766 /* total blocks in file system block size */ 767 upper_limit >>= (bits - 9); 768 769 /* Compute how many blocks we can address by block tree */ 770 res += 1LL << (bits-2); 771 res += 1LL << (2*(bits-2)); 772 res += 1LL << (3*(bits-2)); 773 /* Does block tree limit file size? */ 774 if (res < upper_limit) 775 goto check_lfs; 776 777 res = upper_limit; 778 /* How many metadata blocks are needed for addressing upper_limit? */ 779 upper_limit -= EXT2_NDIR_BLOCKS; 780 /* indirect blocks */ 781 meta_blocks = 1; 782 upper_limit -= ppb; 783 /* double indirect blocks */ 784 if (upper_limit < ppb * ppb) { 785 meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb); 786 res -= meta_blocks; 787 goto check_lfs; 788 } 789 meta_blocks += 1 + ppb; 790 upper_limit -= ppb * ppb; 791 /* tripple indirect blocks for the rest */ 792 meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb) + 793 DIV_ROUND_UP(upper_limit, ppb*ppb); 794 res -= meta_blocks; 795 check_lfs: 796 res <<= bits; 797 if (res > MAX_LFS_FILESIZE) 798 res = MAX_LFS_FILESIZE; 799 800 return res; 801 } 802 803 static unsigned long descriptor_loc(struct super_block *sb, 804 unsigned long logic_sb_block, 805 int nr) 806 { 807 struct ext2_sb_info *sbi = EXT2_SB(sb); 808 unsigned long bg, first_meta_bg; 809 int has_super = 0; 810 811 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 812 813 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || 814 nr < first_meta_bg) 815 return (logic_sb_block + nr + 1); 816 bg = sbi->s_desc_per_block * nr; 817 if (ext2_bg_has_super(sb, bg)) 818 has_super = 1; 819 820 return ext2_group_first_block_no(sb, bg) + has_super; 821 } 822 823 static int ext2_fill_super(struct super_block *sb, void *data, int silent) 824 { 825 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev); 826 struct buffer_head * bh; 827 struct ext2_sb_info * sbi; 828 struct ext2_super_block * es; 829 struct inode *root; 830 unsigned long block; 831 unsigned long sb_block = get_sb_block(&data); 832 unsigned long logic_sb_block; 833 unsigned long offset = 0; 834 unsigned long def_mount_opts; 835 long ret = -ENOMEM; 836 int blocksize = BLOCK_SIZE; 837 int db_count; 838 int i, j; 839 __le32 features; 840 int err; 841 struct ext2_mount_options opts; 842 843 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 844 if (!sbi) 845 goto failed; 846 847 sbi->s_blockgroup_lock = 848 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); 849 if (!sbi->s_blockgroup_lock) { 850 kfree(sbi); 851 goto failed; 852 } 853 sb->s_fs_info = sbi; 854 sbi->s_sb_block = sb_block; 855 sbi->s_daxdev = dax_dev; 856 857 spin_lock_init(&sbi->s_lock); 858 ret = -EINVAL; 859 860 /* 861 * See what the current blocksize for the device is, and 862 * use that as the blocksize. Otherwise (or if the blocksize 863 * is smaller than the default) use the default. 864 * This is important for devices that have a hardware 865 * sectorsize that is larger than the default. 866 */ 867 blocksize = sb_min_blocksize(sb, BLOCK_SIZE); 868 if (!blocksize) { 869 ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); 870 goto failed_sbi; 871 } 872 873 /* 874 * If the superblock doesn't start on a hardware sector boundary, 875 * calculate the offset. 876 */ 877 if (blocksize != BLOCK_SIZE) { 878 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 879 offset = (sb_block*BLOCK_SIZE) % blocksize; 880 } else { 881 logic_sb_block = sb_block; 882 } 883 884 if (!(bh = sb_bread(sb, logic_sb_block))) { 885 ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); 886 goto failed_sbi; 887 } 888 /* 889 * Note: s_es must be initialized as soon as possible because 890 * some ext2 macro-instructions depend on its value 891 */ 892 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 893 sbi->s_es = es; 894 sb->s_magic = le16_to_cpu(es->s_magic); 895 896 if (sb->s_magic != EXT2_SUPER_MAGIC) 897 goto cantfind_ext2; 898 899 opts.s_mount_opt = 0; 900 /* Set defaults before we parse the mount options */ 901 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 902 if (def_mount_opts & EXT2_DEFM_DEBUG) 903 set_opt(opts.s_mount_opt, DEBUG); 904 if (def_mount_opts & EXT2_DEFM_BSDGROUPS) 905 set_opt(opts.s_mount_opt, GRPID); 906 if (def_mount_opts & EXT2_DEFM_UID16) 907 set_opt(opts.s_mount_opt, NO_UID32); 908 #ifdef CONFIG_EXT2_FS_XATTR 909 if (def_mount_opts & EXT2_DEFM_XATTR_USER) 910 set_opt(opts.s_mount_opt, XATTR_USER); 911 #endif 912 #ifdef CONFIG_EXT2_FS_POSIX_ACL 913 if (def_mount_opts & EXT2_DEFM_ACL) 914 set_opt(opts.s_mount_opt, POSIX_ACL); 915 #endif 916 917 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) 918 set_opt(opts.s_mount_opt, ERRORS_PANIC); 919 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) 920 set_opt(opts.s_mount_opt, ERRORS_CONT); 921 else 922 set_opt(opts.s_mount_opt, ERRORS_RO); 923 924 opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); 925 opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); 926 927 set_opt(opts.s_mount_opt, RESERVATION); 928 929 if (!parse_options((char *) data, sb, &opts)) 930 goto failed_mount; 931 932 sbi->s_mount_opt = opts.s_mount_opt; 933 sbi->s_resuid = opts.s_resuid; 934 sbi->s_resgid = opts.s_resgid; 935 936 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | 937 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0); 938 sb->s_iflags |= SB_I_CGROUPWB; 939 940 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && 941 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || 942 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 943 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) 944 ext2_msg(sb, KERN_WARNING, 945 "warning: feature flags set on rev 0 fs, " 946 "running e2fsck is recommended"); 947 /* 948 * Check feature flags regardless of the revision level, since we 949 * previously didn't change the revision level when setting the flags, 950 * so there is a chance incompat flags are set on a rev 0 filesystem. 951 */ 952 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); 953 if (features) { 954 ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " 955 "unsupported optional features (%x)", 956 le32_to_cpu(features)); 957 goto failed_mount; 958 } 959 if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ 960 ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " 961 "unsupported optional features (%x)", 962 le32_to_cpu(features)); 963 goto failed_mount; 964 } 965 966 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); 967 968 if (test_opt(sb, DAX)) { 969 if (!bdev_dax_supported(sb->s_bdev, blocksize)) { 970 ext2_msg(sb, KERN_ERR, 971 "DAX unsupported by block device. Turning off DAX."); 972 clear_opt(sbi->s_mount_opt, DAX); 973 } 974 } 975 976 /* If the blocksize doesn't match, re-read the thing.. */ 977 if (sb->s_blocksize != blocksize) { 978 brelse(bh); 979 980 if (!sb_set_blocksize(sb, blocksize)) { 981 ext2_msg(sb, KERN_ERR, 982 "error: bad blocksize %d", blocksize); 983 goto failed_sbi; 984 } 985 986 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 987 offset = (sb_block*BLOCK_SIZE) % blocksize; 988 bh = sb_bread(sb, logic_sb_block); 989 if(!bh) { 990 ext2_msg(sb, KERN_ERR, "error: couldn't read" 991 "superblock on 2nd try"); 992 goto failed_sbi; 993 } 994 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 995 sbi->s_es = es; 996 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { 997 ext2_msg(sb, KERN_ERR, "error: magic mismatch"); 998 goto failed_mount; 999 } 1000 } 1001 1002 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); 1003 sb->s_max_links = EXT2_LINK_MAX; 1004 sb->s_time_min = S32_MIN; 1005 sb->s_time_max = S32_MAX; 1006 1007 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { 1008 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; 1009 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; 1010 } else { 1011 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 1012 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 1013 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || 1014 !is_power_of_2(sbi->s_inode_size) || 1015 (sbi->s_inode_size > blocksize)) { 1016 ext2_msg(sb, KERN_ERR, 1017 "error: unsupported inode size: %d", 1018 sbi->s_inode_size); 1019 goto failed_mount; 1020 } 1021 } 1022 1023 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << 1024 le32_to_cpu(es->s_log_frag_size); 1025 if (sbi->s_frag_size == 0) 1026 goto cantfind_ext2; 1027 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; 1028 1029 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 1030 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); 1031 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 1032 1033 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); 1034 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) 1035 goto cantfind_ext2; 1036 sbi->s_itb_per_group = sbi->s_inodes_per_group / 1037 sbi->s_inodes_per_block; 1038 sbi->s_desc_per_block = sb->s_blocksize / 1039 sizeof (struct ext2_group_desc); 1040 sbi->s_sbh = bh; 1041 sbi->s_mount_state = le16_to_cpu(es->s_state); 1042 sbi->s_addr_per_block_bits = 1043 ilog2 (EXT2_ADDR_PER_BLOCK(sb)); 1044 sbi->s_desc_per_block_bits = 1045 ilog2 (EXT2_DESC_PER_BLOCK(sb)); 1046 1047 if (sb->s_magic != EXT2_SUPER_MAGIC) 1048 goto cantfind_ext2; 1049 1050 if (sb->s_blocksize != bh->b_size) { 1051 if (!silent) 1052 ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); 1053 goto failed_mount; 1054 } 1055 1056 if (sb->s_blocksize != sbi->s_frag_size) { 1057 ext2_msg(sb, KERN_ERR, 1058 "error: fragsize %lu != blocksize %lu" 1059 "(not supported yet)", 1060 sbi->s_frag_size, sb->s_blocksize); 1061 goto failed_mount; 1062 } 1063 1064 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { 1065 ext2_msg(sb, KERN_ERR, 1066 "error: #blocks per group too big: %lu", 1067 sbi->s_blocks_per_group); 1068 goto failed_mount; 1069 } 1070 if (sbi->s_frags_per_group > sb->s_blocksize * 8) { 1071 ext2_msg(sb, KERN_ERR, 1072 "error: #fragments per group too big: %lu", 1073 sbi->s_frags_per_group); 1074 goto failed_mount; 1075 } 1076 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { 1077 ext2_msg(sb, KERN_ERR, 1078 "error: #inodes per group too big: %lu", 1079 sbi->s_inodes_per_group); 1080 goto failed_mount; 1081 } 1082 1083 if (EXT2_BLOCKS_PER_GROUP(sb) == 0) 1084 goto cantfind_ext2; 1085 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - 1086 le32_to_cpu(es->s_first_data_block) - 1) 1087 / EXT2_BLOCKS_PER_GROUP(sb)) + 1; 1088 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / 1089 EXT2_DESC_PER_BLOCK(sb); 1090 sbi->s_group_desc = kmalloc_array (db_count, 1091 sizeof(struct buffer_head *), 1092 GFP_KERNEL); 1093 if (sbi->s_group_desc == NULL) { 1094 ret = -ENOMEM; 1095 ext2_msg(sb, KERN_ERR, "error: not enough memory"); 1096 goto failed_mount; 1097 } 1098 bgl_lock_init(sbi->s_blockgroup_lock); 1099 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); 1100 if (!sbi->s_debts) { 1101 ret = -ENOMEM; 1102 ext2_msg(sb, KERN_ERR, "error: not enough memory"); 1103 goto failed_mount_group_desc; 1104 } 1105 for (i = 0; i < db_count; i++) { 1106 block = descriptor_loc(sb, logic_sb_block, i); 1107 sbi->s_group_desc[i] = sb_bread(sb, block); 1108 if (!sbi->s_group_desc[i]) { 1109 for (j = 0; j < i; j++) 1110 brelse (sbi->s_group_desc[j]); 1111 ext2_msg(sb, KERN_ERR, 1112 "error: unable to read group descriptors"); 1113 goto failed_mount_group_desc; 1114 } 1115 } 1116 if (!ext2_check_descriptors (sb)) { 1117 ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); 1118 goto failed_mount2; 1119 } 1120 sbi->s_gdb_count = db_count; 1121 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 1122 spin_lock_init(&sbi->s_next_gen_lock); 1123 1124 /* per fileystem reservation list head & lock */ 1125 spin_lock_init(&sbi->s_rsv_window_lock); 1126 sbi->s_rsv_window_root = RB_ROOT; 1127 /* 1128 * Add a single, static dummy reservation to the start of the 1129 * reservation window list --- it gives us a placeholder for 1130 * append-at-start-of-list which makes the allocation logic 1131 * _much_ simpler. 1132 */ 1133 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; 1134 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; 1135 sbi->s_rsv_window_head.rsv_alloc_hit = 0; 1136 sbi->s_rsv_window_head.rsv_goal_size = 0; 1137 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); 1138 1139 err = percpu_counter_init(&sbi->s_freeblocks_counter, 1140 ext2_count_free_blocks(sb), GFP_KERNEL); 1141 if (!err) { 1142 err = percpu_counter_init(&sbi->s_freeinodes_counter, 1143 ext2_count_free_inodes(sb), GFP_KERNEL); 1144 } 1145 if (!err) { 1146 err = percpu_counter_init(&sbi->s_dirs_counter, 1147 ext2_count_dirs(sb), GFP_KERNEL); 1148 } 1149 if (err) { 1150 ext2_msg(sb, KERN_ERR, "error: insufficient memory"); 1151 goto failed_mount3; 1152 } 1153 1154 #ifdef CONFIG_EXT2_FS_XATTR 1155 sbi->s_ea_block_cache = ext2_xattr_create_cache(); 1156 if (!sbi->s_ea_block_cache) { 1157 ret = -ENOMEM; 1158 ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache"); 1159 goto failed_mount3; 1160 } 1161 #endif 1162 /* 1163 * set up enough so that it can read an inode 1164 */ 1165 sb->s_op = &ext2_sops; 1166 sb->s_export_op = &ext2_export_ops; 1167 sb->s_xattr = ext2_xattr_handlers; 1168 1169 #ifdef CONFIG_QUOTA 1170 sb->dq_op = &dquot_operations; 1171 sb->s_qcop = &ext2_quotactl_ops; 1172 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1173 #endif 1174 1175 root = ext2_iget(sb, EXT2_ROOT_INO); 1176 if (IS_ERR(root)) { 1177 ret = PTR_ERR(root); 1178 goto failed_mount3; 1179 } 1180 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 1181 iput(root); 1182 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); 1183 goto failed_mount3; 1184 } 1185 1186 sb->s_root = d_make_root(root); 1187 if (!sb->s_root) { 1188 ext2_msg(sb, KERN_ERR, "error: get root inode failed"); 1189 ret = -ENOMEM; 1190 goto failed_mount3; 1191 } 1192 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 1193 ext2_msg(sb, KERN_WARNING, 1194 "warning: mounting ext3 filesystem as ext2"); 1195 if (ext2_setup_super (sb, es, sb_rdonly(sb))) 1196 sb->s_flags |= SB_RDONLY; 1197 ext2_write_super(sb); 1198 return 0; 1199 1200 cantfind_ext2: 1201 if (!silent) 1202 ext2_msg(sb, KERN_ERR, 1203 "error: can't find an ext2 filesystem on dev %s.", 1204 sb->s_id); 1205 goto failed_mount; 1206 failed_mount3: 1207 ext2_xattr_destroy_cache(sbi->s_ea_block_cache); 1208 percpu_counter_destroy(&sbi->s_freeblocks_counter); 1209 percpu_counter_destroy(&sbi->s_freeinodes_counter); 1210 percpu_counter_destroy(&sbi->s_dirs_counter); 1211 failed_mount2: 1212 for (i = 0; i < db_count; i++) 1213 brelse(sbi->s_group_desc[i]); 1214 failed_mount_group_desc: 1215 kfree(sbi->s_group_desc); 1216 kfree(sbi->s_debts); 1217 failed_mount: 1218 brelse(bh); 1219 failed_sbi: 1220 sb->s_fs_info = NULL; 1221 kfree(sbi->s_blockgroup_lock); 1222 kfree(sbi); 1223 failed: 1224 fs_put_dax(dax_dev); 1225 return ret; 1226 } 1227 1228 static void ext2_clear_super_error(struct super_block *sb) 1229 { 1230 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; 1231 1232 if (buffer_write_io_error(sbh)) { 1233 /* 1234 * Oh, dear. A previous attempt to write the 1235 * superblock failed. This could happen because the 1236 * USB device was yanked out. Or it could happen to 1237 * be a transient write error and maybe the block will 1238 * be remapped. Nothing we can do but to retry the 1239 * write and hope for the best. 1240 */ 1241 ext2_msg(sb, KERN_ERR, 1242 "previous I/O error to superblock detected"); 1243 clear_buffer_write_io_error(sbh); 1244 set_buffer_uptodate(sbh); 1245 } 1246 } 1247 1248 void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, 1249 int wait) 1250 { 1251 ext2_clear_super_error(sb); 1252 spin_lock(&EXT2_SB(sb)->s_lock); 1253 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); 1254 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); 1255 es->s_wtime = cpu_to_le32(ktime_get_real_seconds()); 1256 /* unlock before we do IO */ 1257 spin_unlock(&EXT2_SB(sb)->s_lock); 1258 mark_buffer_dirty(EXT2_SB(sb)->s_sbh); 1259 if (wait) 1260 sync_dirty_buffer(EXT2_SB(sb)->s_sbh); 1261 } 1262 1263 /* 1264 * In the second extended file system, it is not necessary to 1265 * write the super block since we use a mapping of the 1266 * disk super block in a buffer. 1267 * 1268 * However, this function is still used to set the fs valid 1269 * flags to 0. We need to set this flag to 0 since the fs 1270 * may have been checked while mounted and e2fsck may have 1271 * set s_state to EXT2_VALID_FS after some corrections. 1272 */ 1273 static int ext2_sync_fs(struct super_block *sb, int wait) 1274 { 1275 struct ext2_sb_info *sbi = EXT2_SB(sb); 1276 struct ext2_super_block *es = EXT2_SB(sb)->s_es; 1277 1278 /* 1279 * Write quota structures to quota file, sync_blockdev() will write 1280 * them to disk later 1281 */ 1282 dquot_writeback_dquots(sb, -1); 1283 1284 spin_lock(&sbi->s_lock); 1285 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { 1286 ext2_debug("setting valid to 0\n"); 1287 es->s_state &= cpu_to_le16(~EXT2_VALID_FS); 1288 } 1289 spin_unlock(&sbi->s_lock); 1290 ext2_sync_super(sb, es, wait); 1291 return 0; 1292 } 1293 1294 static int ext2_freeze(struct super_block *sb) 1295 { 1296 struct ext2_sb_info *sbi = EXT2_SB(sb); 1297 1298 /* 1299 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared 1300 * because we have unattached inodes and thus filesystem is not fully 1301 * consistent. 1302 */ 1303 if (atomic_long_read(&sb->s_remove_count)) { 1304 ext2_sync_fs(sb, 1); 1305 return 0; 1306 } 1307 /* Set EXT2_FS_VALID flag */ 1308 spin_lock(&sbi->s_lock); 1309 sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state); 1310 spin_unlock(&sbi->s_lock); 1311 ext2_sync_super(sb, sbi->s_es, 1); 1312 1313 return 0; 1314 } 1315 1316 static int ext2_unfreeze(struct super_block *sb) 1317 { 1318 /* Just write sb to clear EXT2_VALID_FS flag */ 1319 ext2_write_super(sb); 1320 1321 return 0; 1322 } 1323 1324 static void ext2_write_super(struct super_block *sb) 1325 { 1326 if (!sb_rdonly(sb)) 1327 ext2_sync_fs(sb, 1); 1328 } 1329 1330 static int ext2_remount (struct super_block * sb, int * flags, char * data) 1331 { 1332 struct ext2_sb_info * sbi = EXT2_SB(sb); 1333 struct ext2_super_block * es; 1334 struct ext2_mount_options new_opts; 1335 int err; 1336 1337 sync_filesystem(sb); 1338 1339 spin_lock(&sbi->s_lock); 1340 new_opts.s_mount_opt = sbi->s_mount_opt; 1341 new_opts.s_resuid = sbi->s_resuid; 1342 new_opts.s_resgid = sbi->s_resgid; 1343 spin_unlock(&sbi->s_lock); 1344 1345 if (!parse_options(data, sb, &new_opts)) 1346 return -EINVAL; 1347 1348 spin_lock(&sbi->s_lock); 1349 es = sbi->s_es; 1350 if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) { 1351 ext2_msg(sb, KERN_WARNING, "warning: refusing change of " 1352 "dax flag with busy inodes while remounting"); 1353 new_opts.s_mount_opt ^= EXT2_MOUNT_DAX; 1354 } 1355 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) 1356 goto out_set; 1357 if (*flags & SB_RDONLY) { 1358 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || 1359 !(sbi->s_mount_state & EXT2_VALID_FS)) 1360 goto out_set; 1361 1362 /* 1363 * OK, we are remounting a valid rw partition rdonly, so set 1364 * the rdonly flag and then mark the partition as valid again. 1365 */ 1366 es->s_state = cpu_to_le16(sbi->s_mount_state); 1367 es->s_mtime = cpu_to_le32(ktime_get_real_seconds()); 1368 spin_unlock(&sbi->s_lock); 1369 1370 err = dquot_suspend(sb, -1); 1371 if (err < 0) 1372 return err; 1373 1374 ext2_sync_super(sb, es, 1); 1375 } else { 1376 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, 1377 ~EXT2_FEATURE_RO_COMPAT_SUPP); 1378 if (ret) { 1379 spin_unlock(&sbi->s_lock); 1380 ext2_msg(sb, KERN_WARNING, 1381 "warning: couldn't remount RDWR because of " 1382 "unsupported optional features (%x).", 1383 le32_to_cpu(ret)); 1384 return -EROFS; 1385 } 1386 /* 1387 * Mounting a RDONLY partition read-write, so reread and 1388 * store the current valid flag. (It may have been changed 1389 * by e2fsck since we originally mounted the partition.) 1390 */ 1391 sbi->s_mount_state = le16_to_cpu(es->s_state); 1392 if (!ext2_setup_super (sb, es, 0)) 1393 sb->s_flags &= ~SB_RDONLY; 1394 spin_unlock(&sbi->s_lock); 1395 1396 ext2_write_super(sb); 1397 1398 dquot_resume(sb, -1); 1399 } 1400 1401 spin_lock(&sbi->s_lock); 1402 out_set: 1403 sbi->s_mount_opt = new_opts.s_mount_opt; 1404 sbi->s_resuid = new_opts.s_resuid; 1405 sbi->s_resgid = new_opts.s_resgid; 1406 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | 1407 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0); 1408 spin_unlock(&sbi->s_lock); 1409 1410 return 0; 1411 } 1412 1413 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) 1414 { 1415 struct super_block *sb = dentry->d_sb; 1416 struct ext2_sb_info *sbi = EXT2_SB(sb); 1417 struct ext2_super_block *es = sbi->s_es; 1418 u64 fsid; 1419 1420 spin_lock(&sbi->s_lock); 1421 1422 if (test_opt (sb, MINIX_DF)) 1423 sbi->s_overhead_last = 0; 1424 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { 1425 unsigned long i, overhead = 0; 1426 smp_rmb(); 1427 1428 /* 1429 * Compute the overhead (FS structures). This is constant 1430 * for a given filesystem unless the number of block groups 1431 * changes so we cache the previous value until it does. 1432 */ 1433 1434 /* 1435 * All of the blocks before first_data_block are 1436 * overhead 1437 */ 1438 overhead = le32_to_cpu(es->s_first_data_block); 1439 1440 /* 1441 * Add the overhead attributed to the superblock and 1442 * block group descriptors. If the sparse superblocks 1443 * feature is turned on, then not all groups have this. 1444 */ 1445 for (i = 0; i < sbi->s_groups_count; i++) 1446 overhead += ext2_bg_has_super(sb, i) + 1447 ext2_bg_num_gdb(sb, i); 1448 1449 /* 1450 * Every block group has an inode bitmap, a block 1451 * bitmap, and an inode table. 1452 */ 1453 overhead += (sbi->s_groups_count * 1454 (2 + sbi->s_itb_per_group)); 1455 sbi->s_overhead_last = overhead; 1456 smp_wmb(); 1457 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); 1458 } 1459 1460 buf->f_type = EXT2_SUPER_MAGIC; 1461 buf->f_bsize = sb->s_blocksize; 1462 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; 1463 buf->f_bfree = ext2_count_free_blocks(sb); 1464 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); 1465 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); 1466 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) 1467 buf->f_bavail = 0; 1468 buf->f_files = le32_to_cpu(es->s_inodes_count); 1469 buf->f_ffree = ext2_count_free_inodes(sb); 1470 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); 1471 buf->f_namelen = EXT2_NAME_LEN; 1472 fsid = le64_to_cpup((void *)es->s_uuid) ^ 1473 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 1474 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 1475 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 1476 spin_unlock(&sbi->s_lock); 1477 return 0; 1478 } 1479 1480 static struct dentry *ext2_mount(struct file_system_type *fs_type, 1481 int flags, const char *dev_name, void *data) 1482 { 1483 return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super); 1484 } 1485 1486 #ifdef CONFIG_QUOTA 1487 1488 /* Read data from quotafile - avoid pagecache and such because we cannot afford 1489 * acquiring the locks... As quota files are never truncated and quota code 1490 * itself serializes the operations (and no one else should touch the files) 1491 * we don't have to be afraid of races */ 1492 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, 1493 size_t len, loff_t off) 1494 { 1495 struct inode *inode = sb_dqopt(sb)->files[type]; 1496 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1497 int err = 0; 1498 int offset = off & (sb->s_blocksize - 1); 1499 int tocopy; 1500 size_t toread; 1501 struct buffer_head tmp_bh; 1502 struct buffer_head *bh; 1503 loff_t i_size = i_size_read(inode); 1504 1505 if (off > i_size) 1506 return 0; 1507 if (off+len > i_size) 1508 len = i_size-off; 1509 toread = len; 1510 while (toread > 0) { 1511 tocopy = sb->s_blocksize - offset < toread ? 1512 sb->s_blocksize - offset : toread; 1513 1514 tmp_bh.b_state = 0; 1515 tmp_bh.b_size = sb->s_blocksize; 1516 err = ext2_get_block(inode, blk, &tmp_bh, 0); 1517 if (err < 0) 1518 return err; 1519 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 1520 memset(data, 0, tocopy); 1521 else { 1522 bh = sb_bread(sb, tmp_bh.b_blocknr); 1523 if (!bh) 1524 return -EIO; 1525 memcpy(data, bh->b_data+offset, tocopy); 1526 brelse(bh); 1527 } 1528 offset = 0; 1529 toread -= tocopy; 1530 data += tocopy; 1531 blk++; 1532 } 1533 return len; 1534 } 1535 1536 /* Write to quotafile */ 1537 static ssize_t ext2_quota_write(struct super_block *sb, int type, 1538 const char *data, size_t len, loff_t off) 1539 { 1540 struct inode *inode = sb_dqopt(sb)->files[type]; 1541 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1542 int err = 0; 1543 int offset = off & (sb->s_blocksize - 1); 1544 int tocopy; 1545 size_t towrite = len; 1546 struct buffer_head tmp_bh; 1547 struct buffer_head *bh; 1548 1549 while (towrite > 0) { 1550 tocopy = sb->s_blocksize - offset < towrite ? 1551 sb->s_blocksize - offset : towrite; 1552 1553 tmp_bh.b_state = 0; 1554 tmp_bh.b_size = sb->s_blocksize; 1555 err = ext2_get_block(inode, blk, &tmp_bh, 1); 1556 if (err < 0) 1557 goto out; 1558 if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) 1559 bh = sb_bread(sb, tmp_bh.b_blocknr); 1560 else 1561 bh = sb_getblk(sb, tmp_bh.b_blocknr); 1562 if (unlikely(!bh)) { 1563 err = -EIO; 1564 goto out; 1565 } 1566 lock_buffer(bh); 1567 memcpy(bh->b_data+offset, data, tocopy); 1568 flush_dcache_page(bh->b_page); 1569 set_buffer_uptodate(bh); 1570 mark_buffer_dirty(bh); 1571 unlock_buffer(bh); 1572 brelse(bh); 1573 offset = 0; 1574 towrite -= tocopy; 1575 data += tocopy; 1576 blk++; 1577 } 1578 out: 1579 if (len == towrite) 1580 return err; 1581 if (inode->i_size < off+len-towrite) 1582 i_size_write(inode, off+len-towrite); 1583 inode_inc_iversion(inode); 1584 inode->i_mtime = inode->i_ctime = current_time(inode); 1585 mark_inode_dirty(inode); 1586 return len - towrite; 1587 } 1588 1589 static int ext2_quota_on(struct super_block *sb, int type, int format_id, 1590 const struct path *path) 1591 { 1592 int err; 1593 struct inode *inode; 1594 1595 err = dquot_quota_on(sb, type, format_id, path); 1596 if (err) 1597 return err; 1598 1599 inode = d_inode(path->dentry); 1600 inode_lock(inode); 1601 EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL; 1602 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, 1603 S_NOATIME | S_IMMUTABLE); 1604 inode_unlock(inode); 1605 mark_inode_dirty(inode); 1606 1607 return 0; 1608 } 1609 1610 static int ext2_quota_off(struct super_block *sb, int type) 1611 { 1612 struct inode *inode = sb_dqopt(sb)->files[type]; 1613 int err; 1614 1615 if (!inode || !igrab(inode)) 1616 goto out; 1617 1618 err = dquot_quota_off(sb, type); 1619 if (err) 1620 goto out_put; 1621 1622 inode_lock(inode); 1623 EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL); 1624 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); 1625 inode_unlock(inode); 1626 mark_inode_dirty(inode); 1627 out_put: 1628 iput(inode); 1629 return err; 1630 out: 1631 return dquot_quota_off(sb, type); 1632 } 1633 1634 #endif 1635 1636 static struct file_system_type ext2_fs_type = { 1637 .owner = THIS_MODULE, 1638 .name = "ext2", 1639 .mount = ext2_mount, 1640 .kill_sb = kill_block_super, 1641 .fs_flags = FS_REQUIRES_DEV, 1642 }; 1643 MODULE_ALIAS_FS("ext2"); 1644 1645 static int __init init_ext2_fs(void) 1646 { 1647 int err; 1648 1649 err = init_inodecache(); 1650 if (err) 1651 return err; 1652 err = register_filesystem(&ext2_fs_type); 1653 if (err) 1654 goto out; 1655 return 0; 1656 out: 1657 destroy_inodecache(); 1658 return err; 1659 } 1660 1661 static void __exit exit_ext2_fs(void) 1662 { 1663 unregister_filesystem(&ext2_fs_type); 1664 destroy_inodecache(); 1665 } 1666 1667 MODULE_AUTHOR("Remy Card and others"); 1668 MODULE_DESCRIPTION("Second Extended Filesystem"); 1669 MODULE_LICENSE("GPL"); 1670 module_init(init_ext2_fs) 1671 module_exit(exit_ext2_fs) 1672