1 /* 2 * linux/fs/ext2/super.c 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/fs/minix/inode.c 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 * 15 * Big-endian to little-endian byte-swapping/bitmaps by 16 * David S. Miller (davem@caip.rutgers.edu), 1995 17 */ 18 19 #include <linux/module.h> 20 #include <linux/string.h> 21 #include <linux/fs.h> 22 #include <linux/slab.h> 23 #include <linux/init.h> 24 #include <linux/blkdev.h> 25 #include <linux/parser.h> 26 #include <linux/random.h> 27 #include <linux/buffer_head.h> 28 #include <linux/exportfs.h> 29 #include <linux/vfs.h> 30 #include <linux/seq_file.h> 31 #include <linux/mount.h> 32 #include <linux/log2.h> 33 #include <linux/quotaops.h> 34 #include <linux/uaccess.h> 35 #include <linux/dax.h> 36 #include <linux/iversion.h> 37 #include "ext2.h" 38 #include "xattr.h" 39 #include "acl.h" 40 41 static void ext2_write_super(struct super_block *sb); 42 static int ext2_remount (struct super_block * sb, int * flags, char * data); 43 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf); 44 static int ext2_sync_fs(struct super_block *sb, int wait); 45 static int ext2_freeze(struct super_block *sb); 46 static int ext2_unfreeze(struct super_block *sb); 47 48 void ext2_error(struct super_block *sb, const char *function, 49 const char *fmt, ...) 50 { 51 struct va_format vaf; 52 va_list args; 53 struct ext2_sb_info *sbi = EXT2_SB(sb); 54 struct ext2_super_block *es = sbi->s_es; 55 56 if (!sb_rdonly(sb)) { 57 spin_lock(&sbi->s_lock); 58 sbi->s_mount_state |= EXT2_ERROR_FS; 59 es->s_state |= cpu_to_le16(EXT2_ERROR_FS); 60 spin_unlock(&sbi->s_lock); 61 ext2_sync_super(sb, es, 1); 62 } 63 64 va_start(args, fmt); 65 66 vaf.fmt = fmt; 67 vaf.va = &args; 68 69 printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n", 70 sb->s_id, function, &vaf); 71 72 va_end(args); 73 74 if (test_opt(sb, ERRORS_PANIC)) 75 panic("EXT2-fs: panic from previous error\n"); 76 if (!sb_rdonly(sb) && test_opt(sb, ERRORS_RO)) { 77 ext2_msg(sb, KERN_CRIT, 78 "error: remounting filesystem read-only"); 79 sb->s_flags |= SB_RDONLY; 80 } 81 } 82 83 void ext2_msg(struct super_block *sb, const char *prefix, 84 const char *fmt, ...) 85 { 86 struct va_format vaf; 87 va_list args; 88 89 va_start(args, fmt); 90 91 vaf.fmt = fmt; 92 vaf.va = &args; 93 94 printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf); 95 96 va_end(args); 97 } 98 99 /* 100 * This must be called with sbi->s_lock held. 101 */ 102 void ext2_update_dynamic_rev(struct super_block *sb) 103 { 104 struct ext2_super_block *es = EXT2_SB(sb)->s_es; 105 106 if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV) 107 return; 108 109 ext2_msg(sb, KERN_WARNING, 110 "warning: updating to rev %d because of " 111 "new feature flag, running e2fsck is recommended", 112 EXT2_DYNAMIC_REV); 113 114 es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO); 115 es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE); 116 es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV); 117 /* leave es->s_feature_*compat flags alone */ 118 /* es->s_uuid will be set by e2fsck if empty */ 119 120 /* 121 * The rest of the superblock fields should be zero, and if not it 122 * means they are likely already in use, so leave them alone. We 123 * can leave it up to e2fsck to clean up any inconsistencies there. 124 */ 125 } 126 127 #ifdef CONFIG_QUOTA 128 static int ext2_quota_off(struct super_block *sb, int type); 129 130 static void ext2_quota_off_umount(struct super_block *sb) 131 { 132 int type; 133 134 for (type = 0; type < MAXQUOTAS; type++) 135 ext2_quota_off(sb, type); 136 } 137 #else 138 static inline void ext2_quota_off_umount(struct super_block *sb) 139 { 140 } 141 #endif 142 143 static void ext2_put_super (struct super_block * sb) 144 { 145 int db_count; 146 int i; 147 struct ext2_sb_info *sbi = EXT2_SB(sb); 148 149 ext2_quota_off_umount(sb); 150 151 ext2_xattr_destroy_cache(sbi->s_ea_block_cache); 152 sbi->s_ea_block_cache = NULL; 153 154 if (!sb_rdonly(sb)) { 155 struct ext2_super_block *es = sbi->s_es; 156 157 spin_lock(&sbi->s_lock); 158 es->s_state = cpu_to_le16(sbi->s_mount_state); 159 spin_unlock(&sbi->s_lock); 160 ext2_sync_super(sb, es, 1); 161 } 162 db_count = sbi->s_gdb_count; 163 for (i = 0; i < db_count; i++) 164 if (sbi->s_group_desc[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 1005 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { 1006 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; 1007 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; 1008 } else { 1009 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 1010 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 1011 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || 1012 !is_power_of_2(sbi->s_inode_size) || 1013 (sbi->s_inode_size > blocksize)) { 1014 ext2_msg(sb, KERN_ERR, 1015 "error: unsupported inode size: %d", 1016 sbi->s_inode_size); 1017 goto failed_mount; 1018 } 1019 } 1020 1021 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << 1022 le32_to_cpu(es->s_log_frag_size); 1023 if (sbi->s_frag_size == 0) 1024 goto cantfind_ext2; 1025 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; 1026 1027 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 1028 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); 1029 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 1030 1031 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); 1032 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) 1033 goto cantfind_ext2; 1034 sbi->s_itb_per_group = sbi->s_inodes_per_group / 1035 sbi->s_inodes_per_block; 1036 sbi->s_desc_per_block = sb->s_blocksize / 1037 sizeof (struct ext2_group_desc); 1038 sbi->s_sbh = bh; 1039 sbi->s_mount_state = le16_to_cpu(es->s_state); 1040 sbi->s_addr_per_block_bits = 1041 ilog2 (EXT2_ADDR_PER_BLOCK(sb)); 1042 sbi->s_desc_per_block_bits = 1043 ilog2 (EXT2_DESC_PER_BLOCK(sb)); 1044 1045 if (sb->s_magic != EXT2_SUPER_MAGIC) 1046 goto cantfind_ext2; 1047 1048 if (sb->s_blocksize != bh->b_size) { 1049 if (!silent) 1050 ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); 1051 goto failed_mount; 1052 } 1053 1054 if (sb->s_blocksize != sbi->s_frag_size) { 1055 ext2_msg(sb, KERN_ERR, 1056 "error: fragsize %lu != blocksize %lu" 1057 "(not supported yet)", 1058 sbi->s_frag_size, sb->s_blocksize); 1059 goto failed_mount; 1060 } 1061 1062 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { 1063 ext2_msg(sb, KERN_ERR, 1064 "error: #blocks per group too big: %lu", 1065 sbi->s_blocks_per_group); 1066 goto failed_mount; 1067 } 1068 if (sbi->s_frags_per_group > sb->s_blocksize * 8) { 1069 ext2_msg(sb, KERN_ERR, 1070 "error: #fragments per group too big: %lu", 1071 sbi->s_frags_per_group); 1072 goto failed_mount; 1073 } 1074 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { 1075 ext2_msg(sb, KERN_ERR, 1076 "error: #inodes per group too big: %lu", 1077 sbi->s_inodes_per_group); 1078 goto failed_mount; 1079 } 1080 1081 if (EXT2_BLOCKS_PER_GROUP(sb) == 0) 1082 goto cantfind_ext2; 1083 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - 1084 le32_to_cpu(es->s_first_data_block) - 1) 1085 / EXT2_BLOCKS_PER_GROUP(sb)) + 1; 1086 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / 1087 EXT2_DESC_PER_BLOCK(sb); 1088 sbi->s_group_desc = kmalloc_array (db_count, 1089 sizeof(struct buffer_head *), 1090 GFP_KERNEL); 1091 if (sbi->s_group_desc == NULL) { 1092 ret = -ENOMEM; 1093 ext2_msg(sb, KERN_ERR, "error: not enough memory"); 1094 goto failed_mount; 1095 } 1096 bgl_lock_init(sbi->s_blockgroup_lock); 1097 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); 1098 if (!sbi->s_debts) { 1099 ret = -ENOMEM; 1100 ext2_msg(sb, KERN_ERR, "error: not enough memory"); 1101 goto failed_mount_group_desc; 1102 } 1103 for (i = 0; i < db_count; i++) { 1104 block = descriptor_loc(sb, logic_sb_block, i); 1105 sbi->s_group_desc[i] = sb_bread(sb, block); 1106 if (!sbi->s_group_desc[i]) { 1107 for (j = 0; j < i; j++) 1108 brelse (sbi->s_group_desc[j]); 1109 ext2_msg(sb, KERN_ERR, 1110 "error: unable to read group descriptors"); 1111 goto failed_mount_group_desc; 1112 } 1113 } 1114 if (!ext2_check_descriptors (sb)) { 1115 ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); 1116 goto failed_mount2; 1117 } 1118 sbi->s_gdb_count = db_count; 1119 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 1120 spin_lock_init(&sbi->s_next_gen_lock); 1121 1122 /* per fileystem reservation list head & lock */ 1123 spin_lock_init(&sbi->s_rsv_window_lock); 1124 sbi->s_rsv_window_root = RB_ROOT; 1125 /* 1126 * Add a single, static dummy reservation to the start of the 1127 * reservation window list --- it gives us a placeholder for 1128 * append-at-start-of-list which makes the allocation logic 1129 * _much_ simpler. 1130 */ 1131 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; 1132 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; 1133 sbi->s_rsv_window_head.rsv_alloc_hit = 0; 1134 sbi->s_rsv_window_head.rsv_goal_size = 0; 1135 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); 1136 1137 err = percpu_counter_init(&sbi->s_freeblocks_counter, 1138 ext2_count_free_blocks(sb), GFP_KERNEL); 1139 if (!err) { 1140 err = percpu_counter_init(&sbi->s_freeinodes_counter, 1141 ext2_count_free_inodes(sb), GFP_KERNEL); 1142 } 1143 if (!err) { 1144 err = percpu_counter_init(&sbi->s_dirs_counter, 1145 ext2_count_dirs(sb), GFP_KERNEL); 1146 } 1147 if (err) { 1148 ext2_msg(sb, KERN_ERR, "error: insufficient memory"); 1149 goto failed_mount3; 1150 } 1151 1152 #ifdef CONFIG_EXT2_FS_XATTR 1153 sbi->s_ea_block_cache = ext2_xattr_create_cache(); 1154 if (!sbi->s_ea_block_cache) { 1155 ret = -ENOMEM; 1156 ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache"); 1157 goto failed_mount3; 1158 } 1159 #endif 1160 /* 1161 * set up enough so that it can read an inode 1162 */ 1163 sb->s_op = &ext2_sops; 1164 sb->s_export_op = &ext2_export_ops; 1165 sb->s_xattr = ext2_xattr_handlers; 1166 1167 #ifdef CONFIG_QUOTA 1168 sb->dq_op = &dquot_operations; 1169 sb->s_qcop = &ext2_quotactl_ops; 1170 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1171 #endif 1172 1173 root = ext2_iget(sb, EXT2_ROOT_INO); 1174 if (IS_ERR(root)) { 1175 ret = PTR_ERR(root); 1176 goto failed_mount3; 1177 } 1178 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 1179 iput(root); 1180 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); 1181 goto failed_mount3; 1182 } 1183 1184 sb->s_root = d_make_root(root); 1185 if (!sb->s_root) { 1186 ext2_msg(sb, KERN_ERR, "error: get root inode failed"); 1187 ret = -ENOMEM; 1188 goto failed_mount3; 1189 } 1190 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 1191 ext2_msg(sb, KERN_WARNING, 1192 "warning: mounting ext3 filesystem as ext2"); 1193 if (ext2_setup_super (sb, es, sb_rdonly(sb))) 1194 sb->s_flags |= SB_RDONLY; 1195 ext2_write_super(sb); 1196 return 0; 1197 1198 cantfind_ext2: 1199 if (!silent) 1200 ext2_msg(sb, KERN_ERR, 1201 "error: can't find an ext2 filesystem on dev %s.", 1202 sb->s_id); 1203 goto failed_mount; 1204 failed_mount3: 1205 ext2_xattr_destroy_cache(sbi->s_ea_block_cache); 1206 percpu_counter_destroy(&sbi->s_freeblocks_counter); 1207 percpu_counter_destroy(&sbi->s_freeinodes_counter); 1208 percpu_counter_destroy(&sbi->s_dirs_counter); 1209 failed_mount2: 1210 for (i = 0; i < db_count; i++) 1211 brelse(sbi->s_group_desc[i]); 1212 failed_mount_group_desc: 1213 kfree(sbi->s_group_desc); 1214 kfree(sbi->s_debts); 1215 failed_mount: 1216 brelse(bh); 1217 failed_sbi: 1218 sb->s_fs_info = NULL; 1219 kfree(sbi->s_blockgroup_lock); 1220 kfree(sbi); 1221 failed: 1222 fs_put_dax(dax_dev); 1223 return ret; 1224 } 1225 1226 static void ext2_clear_super_error(struct super_block *sb) 1227 { 1228 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; 1229 1230 if (buffer_write_io_error(sbh)) { 1231 /* 1232 * Oh, dear. A previous attempt to write the 1233 * superblock failed. This could happen because the 1234 * USB device was yanked out. Or it could happen to 1235 * be a transient write error and maybe the block will 1236 * be remapped. Nothing we can do but to retry the 1237 * write and hope for the best. 1238 */ 1239 ext2_msg(sb, KERN_ERR, 1240 "previous I/O error to superblock detected"); 1241 clear_buffer_write_io_error(sbh); 1242 set_buffer_uptodate(sbh); 1243 } 1244 } 1245 1246 void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, 1247 int wait) 1248 { 1249 ext2_clear_super_error(sb); 1250 spin_lock(&EXT2_SB(sb)->s_lock); 1251 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); 1252 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); 1253 es->s_wtime = cpu_to_le32(ktime_get_real_seconds()); 1254 /* unlock before we do IO */ 1255 spin_unlock(&EXT2_SB(sb)->s_lock); 1256 mark_buffer_dirty(EXT2_SB(sb)->s_sbh); 1257 if (wait) 1258 sync_dirty_buffer(EXT2_SB(sb)->s_sbh); 1259 } 1260 1261 /* 1262 * In the second extended file system, it is not necessary to 1263 * write the super block since we use a mapping of the 1264 * disk super block in a buffer. 1265 * 1266 * However, this function is still used to set the fs valid 1267 * flags to 0. We need to set this flag to 0 since the fs 1268 * may have been checked while mounted and e2fsck may have 1269 * set s_state to EXT2_VALID_FS after some corrections. 1270 */ 1271 static int ext2_sync_fs(struct super_block *sb, int wait) 1272 { 1273 struct ext2_sb_info *sbi = EXT2_SB(sb); 1274 struct ext2_super_block *es = EXT2_SB(sb)->s_es; 1275 1276 /* 1277 * Write quota structures to quota file, sync_blockdev() will write 1278 * them to disk later 1279 */ 1280 dquot_writeback_dquots(sb, -1); 1281 1282 spin_lock(&sbi->s_lock); 1283 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { 1284 ext2_debug("setting valid to 0\n"); 1285 es->s_state &= cpu_to_le16(~EXT2_VALID_FS); 1286 } 1287 spin_unlock(&sbi->s_lock); 1288 ext2_sync_super(sb, es, wait); 1289 return 0; 1290 } 1291 1292 static int ext2_freeze(struct super_block *sb) 1293 { 1294 struct ext2_sb_info *sbi = EXT2_SB(sb); 1295 1296 /* 1297 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared 1298 * because we have unattached inodes and thus filesystem is not fully 1299 * consistent. 1300 */ 1301 if (atomic_long_read(&sb->s_remove_count)) { 1302 ext2_sync_fs(sb, 1); 1303 return 0; 1304 } 1305 /* Set EXT2_FS_VALID flag */ 1306 spin_lock(&sbi->s_lock); 1307 sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state); 1308 spin_unlock(&sbi->s_lock); 1309 ext2_sync_super(sb, sbi->s_es, 1); 1310 1311 return 0; 1312 } 1313 1314 static int ext2_unfreeze(struct super_block *sb) 1315 { 1316 /* Just write sb to clear EXT2_VALID_FS flag */ 1317 ext2_write_super(sb); 1318 1319 return 0; 1320 } 1321 1322 static void ext2_write_super(struct super_block *sb) 1323 { 1324 if (!sb_rdonly(sb)) 1325 ext2_sync_fs(sb, 1); 1326 } 1327 1328 static int ext2_remount (struct super_block * sb, int * flags, char * data) 1329 { 1330 struct ext2_sb_info * sbi = EXT2_SB(sb); 1331 struct ext2_super_block * es; 1332 struct ext2_mount_options new_opts; 1333 int err; 1334 1335 sync_filesystem(sb); 1336 1337 spin_lock(&sbi->s_lock); 1338 new_opts.s_mount_opt = sbi->s_mount_opt; 1339 new_opts.s_resuid = sbi->s_resuid; 1340 new_opts.s_resgid = sbi->s_resgid; 1341 spin_unlock(&sbi->s_lock); 1342 1343 if (!parse_options(data, sb, &new_opts)) 1344 return -EINVAL; 1345 1346 spin_lock(&sbi->s_lock); 1347 es = sbi->s_es; 1348 if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) { 1349 ext2_msg(sb, KERN_WARNING, "warning: refusing change of " 1350 "dax flag with busy inodes while remounting"); 1351 new_opts.s_mount_opt ^= EXT2_MOUNT_DAX; 1352 } 1353 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) 1354 goto out_set; 1355 if (*flags & SB_RDONLY) { 1356 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || 1357 !(sbi->s_mount_state & EXT2_VALID_FS)) 1358 goto out_set; 1359 1360 /* 1361 * OK, we are remounting a valid rw partition rdonly, so set 1362 * the rdonly flag and then mark the partition as valid again. 1363 */ 1364 es->s_state = cpu_to_le16(sbi->s_mount_state); 1365 es->s_mtime = cpu_to_le32(ktime_get_real_seconds()); 1366 spin_unlock(&sbi->s_lock); 1367 1368 err = dquot_suspend(sb, -1); 1369 if (err < 0) 1370 return err; 1371 1372 ext2_sync_super(sb, es, 1); 1373 } else { 1374 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, 1375 ~EXT2_FEATURE_RO_COMPAT_SUPP); 1376 if (ret) { 1377 spin_unlock(&sbi->s_lock); 1378 ext2_msg(sb, KERN_WARNING, 1379 "warning: couldn't remount RDWR because of " 1380 "unsupported optional features (%x).", 1381 le32_to_cpu(ret)); 1382 return -EROFS; 1383 } 1384 /* 1385 * Mounting a RDONLY partition read-write, so reread and 1386 * store the current valid flag. (It may have been changed 1387 * by e2fsck since we originally mounted the partition.) 1388 */ 1389 sbi->s_mount_state = le16_to_cpu(es->s_state); 1390 if (!ext2_setup_super (sb, es, 0)) 1391 sb->s_flags &= ~SB_RDONLY; 1392 spin_unlock(&sbi->s_lock); 1393 1394 ext2_write_super(sb); 1395 1396 dquot_resume(sb, -1); 1397 } 1398 1399 spin_lock(&sbi->s_lock); 1400 out_set: 1401 sbi->s_mount_opt = new_opts.s_mount_opt; 1402 sbi->s_resuid = new_opts.s_resuid; 1403 sbi->s_resgid = new_opts.s_resgid; 1404 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | 1405 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0); 1406 spin_unlock(&sbi->s_lock); 1407 1408 return 0; 1409 } 1410 1411 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) 1412 { 1413 struct super_block *sb = dentry->d_sb; 1414 struct ext2_sb_info *sbi = EXT2_SB(sb); 1415 struct ext2_super_block *es = sbi->s_es; 1416 u64 fsid; 1417 1418 spin_lock(&sbi->s_lock); 1419 1420 if (test_opt (sb, MINIX_DF)) 1421 sbi->s_overhead_last = 0; 1422 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { 1423 unsigned long i, overhead = 0; 1424 smp_rmb(); 1425 1426 /* 1427 * Compute the overhead (FS structures). This is constant 1428 * for a given filesystem unless the number of block groups 1429 * changes so we cache the previous value until it does. 1430 */ 1431 1432 /* 1433 * All of the blocks before first_data_block are 1434 * overhead 1435 */ 1436 overhead = le32_to_cpu(es->s_first_data_block); 1437 1438 /* 1439 * Add the overhead attributed to the superblock and 1440 * block group descriptors. If the sparse superblocks 1441 * feature is turned on, then not all groups have this. 1442 */ 1443 for (i = 0; i < sbi->s_groups_count; i++) 1444 overhead += ext2_bg_has_super(sb, i) + 1445 ext2_bg_num_gdb(sb, i); 1446 1447 /* 1448 * Every block group has an inode bitmap, a block 1449 * bitmap, and an inode table. 1450 */ 1451 overhead += (sbi->s_groups_count * 1452 (2 + sbi->s_itb_per_group)); 1453 sbi->s_overhead_last = overhead; 1454 smp_wmb(); 1455 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); 1456 } 1457 1458 buf->f_type = EXT2_SUPER_MAGIC; 1459 buf->f_bsize = sb->s_blocksize; 1460 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; 1461 buf->f_bfree = ext2_count_free_blocks(sb); 1462 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); 1463 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); 1464 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) 1465 buf->f_bavail = 0; 1466 buf->f_files = le32_to_cpu(es->s_inodes_count); 1467 buf->f_ffree = ext2_count_free_inodes(sb); 1468 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); 1469 buf->f_namelen = EXT2_NAME_LEN; 1470 fsid = le64_to_cpup((void *)es->s_uuid) ^ 1471 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 1472 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 1473 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 1474 spin_unlock(&sbi->s_lock); 1475 return 0; 1476 } 1477 1478 static struct dentry *ext2_mount(struct file_system_type *fs_type, 1479 int flags, const char *dev_name, void *data) 1480 { 1481 return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super); 1482 } 1483 1484 #ifdef CONFIG_QUOTA 1485 1486 /* Read data from quotafile - avoid pagecache and such because we cannot afford 1487 * acquiring the locks... As quota files are never truncated and quota code 1488 * itself serializes the operations (and no one else should touch the files) 1489 * we don't have to be afraid of races */ 1490 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, 1491 size_t len, loff_t off) 1492 { 1493 struct inode *inode = sb_dqopt(sb)->files[type]; 1494 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1495 int err = 0; 1496 int offset = off & (sb->s_blocksize - 1); 1497 int tocopy; 1498 size_t toread; 1499 struct buffer_head tmp_bh; 1500 struct buffer_head *bh; 1501 loff_t i_size = i_size_read(inode); 1502 1503 if (off > i_size) 1504 return 0; 1505 if (off+len > i_size) 1506 len = i_size-off; 1507 toread = len; 1508 while (toread > 0) { 1509 tocopy = sb->s_blocksize - offset < toread ? 1510 sb->s_blocksize - offset : toread; 1511 1512 tmp_bh.b_state = 0; 1513 tmp_bh.b_size = sb->s_blocksize; 1514 err = ext2_get_block(inode, blk, &tmp_bh, 0); 1515 if (err < 0) 1516 return err; 1517 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 1518 memset(data, 0, tocopy); 1519 else { 1520 bh = sb_bread(sb, tmp_bh.b_blocknr); 1521 if (!bh) 1522 return -EIO; 1523 memcpy(data, bh->b_data+offset, tocopy); 1524 brelse(bh); 1525 } 1526 offset = 0; 1527 toread -= tocopy; 1528 data += tocopy; 1529 blk++; 1530 } 1531 return len; 1532 } 1533 1534 /* Write to quotafile */ 1535 static ssize_t ext2_quota_write(struct super_block *sb, int type, 1536 const char *data, size_t len, loff_t off) 1537 { 1538 struct inode *inode = sb_dqopt(sb)->files[type]; 1539 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1540 int err = 0; 1541 int offset = off & (sb->s_blocksize - 1); 1542 int tocopy; 1543 size_t towrite = len; 1544 struct buffer_head tmp_bh; 1545 struct buffer_head *bh; 1546 1547 while (towrite > 0) { 1548 tocopy = sb->s_blocksize - offset < towrite ? 1549 sb->s_blocksize - offset : towrite; 1550 1551 tmp_bh.b_state = 0; 1552 tmp_bh.b_size = sb->s_blocksize; 1553 err = ext2_get_block(inode, blk, &tmp_bh, 1); 1554 if (err < 0) 1555 goto out; 1556 if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) 1557 bh = sb_bread(sb, tmp_bh.b_blocknr); 1558 else 1559 bh = sb_getblk(sb, tmp_bh.b_blocknr); 1560 if (unlikely(!bh)) { 1561 err = -EIO; 1562 goto out; 1563 } 1564 lock_buffer(bh); 1565 memcpy(bh->b_data+offset, data, tocopy); 1566 flush_dcache_page(bh->b_page); 1567 set_buffer_uptodate(bh); 1568 mark_buffer_dirty(bh); 1569 unlock_buffer(bh); 1570 brelse(bh); 1571 offset = 0; 1572 towrite -= tocopy; 1573 data += tocopy; 1574 blk++; 1575 } 1576 out: 1577 if (len == towrite) 1578 return err; 1579 if (inode->i_size < off+len-towrite) 1580 i_size_write(inode, off+len-towrite); 1581 inode_inc_iversion(inode); 1582 inode->i_mtime = inode->i_ctime = current_time(inode); 1583 mark_inode_dirty(inode); 1584 return len - towrite; 1585 } 1586 1587 static int ext2_quota_on(struct super_block *sb, int type, int format_id, 1588 const struct path *path) 1589 { 1590 int err; 1591 struct inode *inode; 1592 1593 err = dquot_quota_on(sb, type, format_id, path); 1594 if (err) 1595 return err; 1596 1597 inode = d_inode(path->dentry); 1598 inode_lock(inode); 1599 EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL; 1600 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, 1601 S_NOATIME | S_IMMUTABLE); 1602 inode_unlock(inode); 1603 mark_inode_dirty(inode); 1604 1605 return 0; 1606 } 1607 1608 static int ext2_quota_off(struct super_block *sb, int type) 1609 { 1610 struct inode *inode = sb_dqopt(sb)->files[type]; 1611 int err; 1612 1613 if (!inode || !igrab(inode)) 1614 goto out; 1615 1616 err = dquot_quota_off(sb, type); 1617 if (err) 1618 goto out_put; 1619 1620 inode_lock(inode); 1621 EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL); 1622 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); 1623 inode_unlock(inode); 1624 mark_inode_dirty(inode); 1625 out_put: 1626 iput(inode); 1627 return err; 1628 out: 1629 return dquot_quota_off(sb, type); 1630 } 1631 1632 #endif 1633 1634 static struct file_system_type ext2_fs_type = { 1635 .owner = THIS_MODULE, 1636 .name = "ext2", 1637 .mount = ext2_mount, 1638 .kill_sb = kill_block_super, 1639 .fs_flags = FS_REQUIRES_DEV, 1640 }; 1641 MODULE_ALIAS_FS("ext2"); 1642 1643 static int __init init_ext2_fs(void) 1644 { 1645 int err; 1646 1647 err = init_inodecache(); 1648 if (err) 1649 return err; 1650 err = register_filesystem(&ext2_fs_type); 1651 if (err) 1652 goto out; 1653 return 0; 1654 out: 1655 destroy_inodecache(); 1656 return err; 1657 } 1658 1659 static void __exit exit_ext2_fs(void) 1660 { 1661 unregister_filesystem(&ext2_fs_type); 1662 destroy_inodecache(); 1663 } 1664 1665 MODULE_AUTHOR("Remy Card and others"); 1666 MODULE_DESCRIPTION("Second Extended Filesystem"); 1667 MODULE_LICENSE("GPL"); 1668 module_init(init_ext2_fs) 1669 module_exit(exit_ext2_fs) 1670