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 (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 if (sbi->s_ea_block_cache) { 152 ext2_xattr_destroy_cache(sbi->s_ea_block_cache); 153 sbi->s_ea_block_cache = NULL; 154 } 155 if (!sb_rdonly(sb)) { 156 struct ext2_super_block *es = sbi->s_es; 157 158 spin_lock(&sbi->s_lock); 159 es->s_state = cpu_to_le16(sbi->s_mount_state); 160 spin_unlock(&sbi->s_lock); 161 ext2_sync_super(sb, es, 1); 162 } 163 db_count = sbi->s_gdb_count; 164 for (i = 0; i < db_count; i++) 165 if (sbi->s_group_desc[i]) 166 brelse (sbi->s_group_desc[i]); 167 kfree(sbi->s_group_desc); 168 kfree(sbi->s_debts); 169 percpu_counter_destroy(&sbi->s_freeblocks_counter); 170 percpu_counter_destroy(&sbi->s_freeinodes_counter); 171 percpu_counter_destroy(&sbi->s_dirs_counter); 172 brelse (sbi->s_sbh); 173 sb->s_fs_info = NULL; 174 kfree(sbi->s_blockgroup_lock); 175 fs_put_dax(sbi->s_daxdev); 176 kfree(sbi); 177 } 178 179 static struct kmem_cache * ext2_inode_cachep; 180 181 static struct inode *ext2_alloc_inode(struct super_block *sb) 182 { 183 struct ext2_inode_info *ei; 184 ei = kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL); 185 if (!ei) 186 return NULL; 187 ei->i_block_alloc_info = NULL; 188 inode_set_iversion(&ei->vfs_inode, 1); 189 #ifdef CONFIG_QUOTA 190 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot)); 191 #endif 192 193 return &ei->vfs_inode; 194 } 195 196 static void ext2_i_callback(struct rcu_head *head) 197 { 198 struct inode *inode = container_of(head, struct inode, i_rcu); 199 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode)); 200 } 201 202 static void ext2_destroy_inode(struct inode *inode) 203 { 204 call_rcu(&inode->i_rcu, ext2_i_callback); 205 } 206 207 static void init_once(void *foo) 208 { 209 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo; 210 211 rwlock_init(&ei->i_meta_lock); 212 #ifdef CONFIG_EXT2_FS_XATTR 213 init_rwsem(&ei->xattr_sem); 214 #endif 215 mutex_init(&ei->truncate_mutex); 216 #ifdef CONFIG_FS_DAX 217 init_rwsem(&ei->dax_sem); 218 #endif 219 inode_init_once(&ei->vfs_inode); 220 } 221 222 static int __init init_inodecache(void) 223 { 224 ext2_inode_cachep = kmem_cache_create_usercopy("ext2_inode_cache", 225 sizeof(struct ext2_inode_info), 0, 226 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| 227 SLAB_ACCOUNT), 228 offsetof(struct ext2_inode_info, i_data), 229 sizeof_field(struct ext2_inode_info, i_data), 230 init_once); 231 if (ext2_inode_cachep == NULL) 232 return -ENOMEM; 233 return 0; 234 } 235 236 static void destroy_inodecache(void) 237 { 238 /* 239 * Make sure all delayed rcu free inodes are flushed before we 240 * destroy cache. 241 */ 242 rcu_barrier(); 243 kmem_cache_destroy(ext2_inode_cachep); 244 } 245 246 static int ext2_show_options(struct seq_file *seq, struct dentry *root) 247 { 248 struct super_block *sb = root->d_sb; 249 struct ext2_sb_info *sbi = EXT2_SB(sb); 250 struct ext2_super_block *es = sbi->s_es; 251 unsigned long def_mount_opts; 252 253 spin_lock(&sbi->s_lock); 254 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 255 256 if (sbi->s_sb_block != 1) 257 seq_printf(seq, ",sb=%lu", sbi->s_sb_block); 258 if (test_opt(sb, MINIX_DF)) 259 seq_puts(seq, ",minixdf"); 260 if (test_opt(sb, GRPID)) 261 seq_puts(seq, ",grpid"); 262 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS)) 263 seq_puts(seq, ",nogrpid"); 264 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) || 265 le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) { 266 seq_printf(seq, ",resuid=%u", 267 from_kuid_munged(&init_user_ns, sbi->s_resuid)); 268 } 269 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) || 270 le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) { 271 seq_printf(seq, ",resgid=%u", 272 from_kgid_munged(&init_user_ns, sbi->s_resgid)); 273 } 274 if (test_opt(sb, ERRORS_RO)) { 275 int def_errors = le16_to_cpu(es->s_errors); 276 277 if (def_errors == EXT2_ERRORS_PANIC || 278 def_errors == EXT2_ERRORS_CONTINUE) { 279 seq_puts(seq, ",errors=remount-ro"); 280 } 281 } 282 if (test_opt(sb, ERRORS_CONT)) 283 seq_puts(seq, ",errors=continue"); 284 if (test_opt(sb, ERRORS_PANIC)) 285 seq_puts(seq, ",errors=panic"); 286 if (test_opt(sb, NO_UID32)) 287 seq_puts(seq, ",nouid32"); 288 if (test_opt(sb, DEBUG)) 289 seq_puts(seq, ",debug"); 290 if (test_opt(sb, OLDALLOC)) 291 seq_puts(seq, ",oldalloc"); 292 293 #ifdef CONFIG_EXT2_FS_XATTR 294 if (test_opt(sb, XATTR_USER)) 295 seq_puts(seq, ",user_xattr"); 296 if (!test_opt(sb, XATTR_USER) && 297 (def_mount_opts & EXT2_DEFM_XATTR_USER)) { 298 seq_puts(seq, ",nouser_xattr"); 299 } 300 #endif 301 302 #ifdef CONFIG_EXT2_FS_POSIX_ACL 303 if (test_opt(sb, POSIX_ACL)) 304 seq_puts(seq, ",acl"); 305 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL)) 306 seq_puts(seq, ",noacl"); 307 #endif 308 309 if (test_opt(sb, NOBH)) 310 seq_puts(seq, ",nobh"); 311 312 if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA) 313 seq_puts(seq, ",usrquota"); 314 315 if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA) 316 seq_puts(seq, ",grpquota"); 317 318 if (sbi->s_mount_opt & EXT2_MOUNT_XIP) 319 seq_puts(seq, ",xip"); 320 321 if (sbi->s_mount_opt & EXT2_MOUNT_DAX) 322 seq_puts(seq, ",dax"); 323 324 if (!test_opt(sb, RESERVATION)) 325 seq_puts(seq, ",noreservation"); 326 327 spin_unlock(&sbi->s_lock); 328 return 0; 329 } 330 331 #ifdef CONFIG_QUOTA 332 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); 333 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); 334 static int ext2_quota_on(struct super_block *sb, int type, int format_id, 335 const struct path *path); 336 static struct dquot **ext2_get_dquots(struct inode *inode) 337 { 338 return EXT2_I(inode)->i_dquot; 339 } 340 341 static const struct quotactl_ops ext2_quotactl_ops = { 342 .quota_on = ext2_quota_on, 343 .quota_off = ext2_quota_off, 344 .quota_sync = dquot_quota_sync, 345 .get_state = dquot_get_state, 346 .set_info = dquot_set_dqinfo, 347 .get_dqblk = dquot_get_dqblk, 348 .set_dqblk = dquot_set_dqblk, 349 .get_nextdqblk = dquot_get_next_dqblk, 350 }; 351 #endif 352 353 static const struct super_operations ext2_sops = { 354 .alloc_inode = ext2_alloc_inode, 355 .destroy_inode = ext2_destroy_inode, 356 .write_inode = ext2_write_inode, 357 .evict_inode = ext2_evict_inode, 358 .put_super = ext2_put_super, 359 .sync_fs = ext2_sync_fs, 360 .freeze_fs = ext2_freeze, 361 .unfreeze_fs = ext2_unfreeze, 362 .statfs = ext2_statfs, 363 .remount_fs = ext2_remount, 364 .show_options = ext2_show_options, 365 #ifdef CONFIG_QUOTA 366 .quota_read = ext2_quota_read, 367 .quota_write = ext2_quota_write, 368 .get_dquots = ext2_get_dquots, 369 #endif 370 }; 371 372 static struct inode *ext2_nfs_get_inode(struct super_block *sb, 373 u64 ino, u32 generation) 374 { 375 struct inode *inode; 376 377 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) 378 return ERR_PTR(-ESTALE); 379 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) 380 return ERR_PTR(-ESTALE); 381 382 /* 383 * ext2_iget isn't quite right if the inode is currently unallocated! 384 * However ext2_iget currently does appropriate checks to handle stale 385 * inodes so everything is OK. 386 */ 387 inode = ext2_iget(sb, ino); 388 if (IS_ERR(inode)) 389 return ERR_CAST(inode); 390 if (generation && inode->i_generation != generation) { 391 /* we didn't find the right inode.. */ 392 iput(inode); 393 return ERR_PTR(-ESTALE); 394 } 395 return inode; 396 } 397 398 static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid, 399 int fh_len, int fh_type) 400 { 401 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 402 ext2_nfs_get_inode); 403 } 404 405 static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid, 406 int fh_len, int fh_type) 407 { 408 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 409 ext2_nfs_get_inode); 410 } 411 412 static const struct export_operations ext2_export_ops = { 413 .fh_to_dentry = ext2_fh_to_dentry, 414 .fh_to_parent = ext2_fh_to_parent, 415 .get_parent = ext2_get_parent, 416 }; 417 418 static unsigned long get_sb_block(void **data) 419 { 420 unsigned long sb_block; 421 char *options = (char *) *data; 422 423 if (!options || strncmp(options, "sb=", 3) != 0) 424 return 1; /* Default location */ 425 options += 3; 426 sb_block = simple_strtoul(options, &options, 0); 427 if (*options && *options != ',') { 428 printk("EXT2-fs: Invalid sb specification: %s\n", 429 (char *) *data); 430 return 1; 431 } 432 if (*options == ',') 433 options++; 434 *data = (void *) options; 435 return sb_block; 436 } 437 438 enum { 439 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 440 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, 441 Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug, 442 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, 443 Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota, 444 Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation 445 }; 446 447 static const match_table_t tokens = { 448 {Opt_bsd_df, "bsddf"}, 449 {Opt_minix_df, "minixdf"}, 450 {Opt_grpid, "grpid"}, 451 {Opt_grpid, "bsdgroups"}, 452 {Opt_nogrpid, "nogrpid"}, 453 {Opt_nogrpid, "sysvgroups"}, 454 {Opt_resgid, "resgid=%u"}, 455 {Opt_resuid, "resuid=%u"}, 456 {Opt_sb, "sb=%u"}, 457 {Opt_err_cont, "errors=continue"}, 458 {Opt_err_panic, "errors=panic"}, 459 {Opt_err_ro, "errors=remount-ro"}, 460 {Opt_nouid32, "nouid32"}, 461 {Opt_nocheck, "check=none"}, 462 {Opt_nocheck, "nocheck"}, 463 {Opt_debug, "debug"}, 464 {Opt_oldalloc, "oldalloc"}, 465 {Opt_orlov, "orlov"}, 466 {Opt_nobh, "nobh"}, 467 {Opt_user_xattr, "user_xattr"}, 468 {Opt_nouser_xattr, "nouser_xattr"}, 469 {Opt_acl, "acl"}, 470 {Opt_noacl, "noacl"}, 471 {Opt_xip, "xip"}, 472 {Opt_dax, "dax"}, 473 {Opt_grpquota, "grpquota"}, 474 {Opt_ignore, "noquota"}, 475 {Opt_quota, "quota"}, 476 {Opt_usrquota, "usrquota"}, 477 {Opt_reservation, "reservation"}, 478 {Opt_noreservation, "noreservation"}, 479 {Opt_err, NULL} 480 }; 481 482 static int parse_options(char *options, struct super_block *sb, 483 struct ext2_mount_options *opts) 484 { 485 char *p; 486 substring_t args[MAX_OPT_ARGS]; 487 int option; 488 kuid_t uid; 489 kgid_t gid; 490 491 if (!options) 492 return 1; 493 494 while ((p = strsep (&options, ",")) != NULL) { 495 int token; 496 if (!*p) 497 continue; 498 499 token = match_token(p, tokens, args); 500 switch (token) { 501 case Opt_bsd_df: 502 clear_opt (opts->s_mount_opt, MINIX_DF); 503 break; 504 case Opt_minix_df: 505 set_opt (opts->s_mount_opt, MINIX_DF); 506 break; 507 case Opt_grpid: 508 set_opt (opts->s_mount_opt, GRPID); 509 break; 510 case Opt_nogrpid: 511 clear_opt (opts->s_mount_opt, GRPID); 512 break; 513 case Opt_resuid: 514 if (match_int(&args[0], &option)) 515 return 0; 516 uid = make_kuid(current_user_ns(), option); 517 if (!uid_valid(uid)) { 518 ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option); 519 return 0; 520 521 } 522 opts->s_resuid = uid; 523 break; 524 case Opt_resgid: 525 if (match_int(&args[0], &option)) 526 return 0; 527 gid = make_kgid(current_user_ns(), option); 528 if (!gid_valid(gid)) { 529 ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option); 530 return 0; 531 } 532 opts->s_resgid = gid; 533 break; 534 case Opt_sb: 535 /* handled by get_sb_block() instead of here */ 536 /* *sb_block = match_int(&args[0]); */ 537 break; 538 case Opt_err_panic: 539 clear_opt (opts->s_mount_opt, ERRORS_CONT); 540 clear_opt (opts->s_mount_opt, ERRORS_RO); 541 set_opt (opts->s_mount_opt, ERRORS_PANIC); 542 break; 543 case Opt_err_ro: 544 clear_opt (opts->s_mount_opt, ERRORS_CONT); 545 clear_opt (opts->s_mount_opt, ERRORS_PANIC); 546 set_opt (opts->s_mount_opt, ERRORS_RO); 547 break; 548 case Opt_err_cont: 549 clear_opt (opts->s_mount_opt, ERRORS_RO); 550 clear_opt (opts->s_mount_opt, ERRORS_PANIC); 551 set_opt (opts->s_mount_opt, ERRORS_CONT); 552 break; 553 case Opt_nouid32: 554 set_opt (opts->s_mount_opt, NO_UID32); 555 break; 556 case Opt_nocheck: 557 ext2_msg(sb, KERN_WARNING, 558 "Option nocheck/check=none is deprecated and" 559 " will be removed in June 2020."); 560 clear_opt (opts->s_mount_opt, CHECK); 561 break; 562 case Opt_debug: 563 set_opt (opts->s_mount_opt, DEBUG); 564 break; 565 case Opt_oldalloc: 566 set_opt (opts->s_mount_opt, OLDALLOC); 567 break; 568 case Opt_orlov: 569 clear_opt (opts->s_mount_opt, OLDALLOC); 570 break; 571 case Opt_nobh: 572 set_opt (opts->s_mount_opt, NOBH); 573 break; 574 #ifdef CONFIG_EXT2_FS_XATTR 575 case Opt_user_xattr: 576 set_opt (opts->s_mount_opt, XATTR_USER); 577 break; 578 case Opt_nouser_xattr: 579 clear_opt (opts->s_mount_opt, XATTR_USER); 580 break; 581 #else 582 case Opt_user_xattr: 583 case Opt_nouser_xattr: 584 ext2_msg(sb, KERN_INFO, "(no)user_xattr options" 585 "not supported"); 586 break; 587 #endif 588 #ifdef CONFIG_EXT2_FS_POSIX_ACL 589 case Opt_acl: 590 set_opt(opts->s_mount_opt, POSIX_ACL); 591 break; 592 case Opt_noacl: 593 clear_opt(opts->s_mount_opt, POSIX_ACL); 594 break; 595 #else 596 case Opt_acl: 597 case Opt_noacl: 598 ext2_msg(sb, KERN_INFO, 599 "(no)acl options not supported"); 600 break; 601 #endif 602 case Opt_xip: 603 ext2_msg(sb, KERN_INFO, "use dax instead of xip"); 604 set_opt(opts->s_mount_opt, XIP); 605 /* Fall through */ 606 case Opt_dax: 607 #ifdef CONFIG_FS_DAX 608 ext2_msg(sb, KERN_WARNING, 609 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); 610 set_opt(opts->s_mount_opt, DAX); 611 #else 612 ext2_msg(sb, KERN_INFO, "dax option not supported"); 613 #endif 614 break; 615 616 #if defined(CONFIG_QUOTA) 617 case Opt_quota: 618 case Opt_usrquota: 619 set_opt(opts->s_mount_opt, USRQUOTA); 620 break; 621 622 case Opt_grpquota: 623 set_opt(opts->s_mount_opt, GRPQUOTA); 624 break; 625 #else 626 case Opt_quota: 627 case Opt_usrquota: 628 case Opt_grpquota: 629 ext2_msg(sb, KERN_INFO, 630 "quota operations not supported"); 631 break; 632 #endif 633 634 case Opt_reservation: 635 set_opt(opts->s_mount_opt, RESERVATION); 636 ext2_msg(sb, KERN_INFO, "reservations ON"); 637 break; 638 case Opt_noreservation: 639 clear_opt(opts->s_mount_opt, RESERVATION); 640 ext2_msg(sb, KERN_INFO, "reservations OFF"); 641 break; 642 case Opt_ignore: 643 break; 644 default: 645 return 0; 646 } 647 } 648 return 1; 649 } 650 651 static int ext2_setup_super (struct super_block * sb, 652 struct ext2_super_block * es, 653 int read_only) 654 { 655 int res = 0; 656 struct ext2_sb_info *sbi = EXT2_SB(sb); 657 658 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { 659 ext2_msg(sb, KERN_ERR, 660 "error: revision level too high, " 661 "forcing read-only mode"); 662 res = SB_RDONLY; 663 } 664 if (read_only) 665 return res; 666 if (!(sbi->s_mount_state & EXT2_VALID_FS)) 667 ext2_msg(sb, KERN_WARNING, 668 "warning: mounting unchecked fs, " 669 "running e2fsck is recommended"); 670 else if ((sbi->s_mount_state & EXT2_ERROR_FS)) 671 ext2_msg(sb, KERN_WARNING, 672 "warning: mounting fs with errors, " 673 "running e2fsck is recommended"); 674 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 675 le16_to_cpu(es->s_mnt_count) >= 676 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 677 ext2_msg(sb, KERN_WARNING, 678 "warning: maximal mount count reached, " 679 "running e2fsck is recommended"); 680 else if (le32_to_cpu(es->s_checkinterval) && 681 (le32_to_cpu(es->s_lastcheck) + 682 le32_to_cpu(es->s_checkinterval) <= 683 ktime_get_real_seconds())) 684 ext2_msg(sb, KERN_WARNING, 685 "warning: checktime reached, " 686 "running e2fsck is recommended"); 687 if (!le16_to_cpu(es->s_max_mnt_count)) 688 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); 689 le16_add_cpu(&es->s_mnt_count, 1); 690 if (test_opt (sb, DEBUG)) 691 ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, " 692 "bpg=%lu, ipg=%lu, mo=%04lx]", 693 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, 694 sbi->s_frag_size, 695 sbi->s_groups_count, 696 EXT2_BLOCKS_PER_GROUP(sb), 697 EXT2_INODES_PER_GROUP(sb), 698 sbi->s_mount_opt); 699 return res; 700 } 701 702 static int ext2_check_descriptors(struct super_block *sb) 703 { 704 int i; 705 struct ext2_sb_info *sbi = EXT2_SB(sb); 706 707 ext2_debug ("Checking group descriptors"); 708 709 for (i = 0; i < sbi->s_groups_count; i++) { 710 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL); 711 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i); 712 ext2_fsblk_t last_block; 713 714 if (i == sbi->s_groups_count - 1) 715 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; 716 else 717 last_block = first_block + 718 (EXT2_BLOCKS_PER_GROUP(sb) - 1); 719 720 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || 721 le32_to_cpu(gdp->bg_block_bitmap) > last_block) 722 { 723 ext2_error (sb, "ext2_check_descriptors", 724 "Block bitmap for group %d" 725 " not in group (block %lu)!", 726 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); 727 return 0; 728 } 729 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || 730 le32_to_cpu(gdp->bg_inode_bitmap) > last_block) 731 { 732 ext2_error (sb, "ext2_check_descriptors", 733 "Inode bitmap for group %d" 734 " not in group (block %lu)!", 735 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); 736 return 0; 737 } 738 if (le32_to_cpu(gdp->bg_inode_table) < first_block || 739 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > 740 last_block) 741 { 742 ext2_error (sb, "ext2_check_descriptors", 743 "Inode table for group %d" 744 " not in group (block %lu)!", 745 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); 746 return 0; 747 } 748 } 749 return 1; 750 } 751 752 /* 753 * Maximal file size. There is a direct, and {,double-,triple-}indirect 754 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. 755 * We need to be 1 filesystem block less than the 2^32 sector limit. 756 */ 757 static loff_t ext2_max_size(int bits) 758 { 759 loff_t res = EXT2_NDIR_BLOCKS; 760 int meta_blocks; 761 loff_t upper_limit; 762 763 /* This is calculated to be the largest file size for a 764 * dense, file such that the total number of 765 * sectors in the file, including data and all indirect blocks, 766 * does not exceed 2^32 -1 767 * __u32 i_blocks representing the total number of 768 * 512 bytes blocks of the file 769 */ 770 upper_limit = (1LL << 32) - 1; 771 772 /* total blocks in file system block size */ 773 upper_limit >>= (bits - 9); 774 775 776 /* indirect blocks */ 777 meta_blocks = 1; 778 /* double indirect blocks */ 779 meta_blocks += 1 + (1LL << (bits-2)); 780 /* tripple indirect blocks */ 781 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); 782 783 upper_limit -= meta_blocks; 784 upper_limit <<= bits; 785 786 res += 1LL << (bits-2); 787 res += 1LL << (2*(bits-2)); 788 res += 1LL << (3*(bits-2)); 789 res <<= bits; 790 if (res > upper_limit) 791 res = upper_limit; 792 793 if (res > MAX_LFS_FILESIZE) 794 res = MAX_LFS_FILESIZE; 795 796 return res; 797 } 798 799 static unsigned long descriptor_loc(struct super_block *sb, 800 unsigned long logic_sb_block, 801 int nr) 802 { 803 struct ext2_sb_info *sbi = EXT2_SB(sb); 804 unsigned long bg, first_meta_bg; 805 int has_super = 0; 806 807 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 808 809 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || 810 nr < first_meta_bg) 811 return (logic_sb_block + nr + 1); 812 bg = sbi->s_desc_per_block * nr; 813 if (ext2_bg_has_super(sb, bg)) 814 has_super = 1; 815 816 return ext2_group_first_block_no(sb, bg) + has_super; 817 } 818 819 static int ext2_fill_super(struct super_block *sb, void *data, int silent) 820 { 821 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev); 822 struct buffer_head * bh; 823 struct ext2_sb_info * sbi; 824 struct ext2_super_block * es; 825 struct inode *root; 826 unsigned long block; 827 unsigned long sb_block = get_sb_block(&data); 828 unsigned long logic_sb_block; 829 unsigned long offset = 0; 830 unsigned long def_mount_opts; 831 long ret = -ENOMEM; 832 int blocksize = BLOCK_SIZE; 833 int db_count; 834 int i, j; 835 __le32 features; 836 int err; 837 struct ext2_mount_options opts; 838 839 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 840 if (!sbi) 841 goto failed; 842 843 sbi->s_blockgroup_lock = 844 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); 845 if (!sbi->s_blockgroup_lock) { 846 kfree(sbi); 847 goto failed; 848 } 849 sb->s_fs_info = sbi; 850 sbi->s_sb_block = sb_block; 851 sbi->s_daxdev = dax_dev; 852 853 spin_lock_init(&sbi->s_lock); 854 ret = -EINVAL; 855 856 /* 857 * See what the current blocksize for the device is, and 858 * use that as the blocksize. Otherwise (or if the blocksize 859 * is smaller than the default) use the default. 860 * This is important for devices that have a hardware 861 * sectorsize that is larger than the default. 862 */ 863 blocksize = sb_min_blocksize(sb, BLOCK_SIZE); 864 if (!blocksize) { 865 ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); 866 goto failed_sbi; 867 } 868 869 /* 870 * If the superblock doesn't start on a hardware sector boundary, 871 * calculate the offset. 872 */ 873 if (blocksize != BLOCK_SIZE) { 874 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 875 offset = (sb_block*BLOCK_SIZE) % blocksize; 876 } else { 877 logic_sb_block = sb_block; 878 } 879 880 if (!(bh = sb_bread(sb, logic_sb_block))) { 881 ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); 882 goto failed_sbi; 883 } 884 /* 885 * Note: s_es must be initialized as soon as possible because 886 * some ext2 macro-instructions depend on its value 887 */ 888 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 889 sbi->s_es = es; 890 sb->s_magic = le16_to_cpu(es->s_magic); 891 892 if (sb->s_magic != EXT2_SUPER_MAGIC) 893 goto cantfind_ext2; 894 895 /* Set defaults before we parse the mount options */ 896 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 897 if (def_mount_opts & EXT2_DEFM_DEBUG) 898 set_opt(opts.s_mount_opt, DEBUG); 899 if (def_mount_opts & EXT2_DEFM_BSDGROUPS) 900 set_opt(opts.s_mount_opt, GRPID); 901 if (def_mount_opts & EXT2_DEFM_UID16) 902 set_opt(opts.s_mount_opt, NO_UID32); 903 #ifdef CONFIG_EXT2_FS_XATTR 904 if (def_mount_opts & EXT2_DEFM_XATTR_USER) 905 set_opt(opts.s_mount_opt, XATTR_USER); 906 #endif 907 #ifdef CONFIG_EXT2_FS_POSIX_ACL 908 if (def_mount_opts & EXT2_DEFM_ACL) 909 set_opt(opts.s_mount_opt, POSIX_ACL); 910 #endif 911 912 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) 913 set_opt(opts.s_mount_opt, ERRORS_PANIC); 914 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) 915 set_opt(opts.s_mount_opt, ERRORS_CONT); 916 else 917 set_opt(opts.s_mount_opt, ERRORS_RO); 918 919 opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); 920 opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); 921 922 set_opt(opts.s_mount_opt, RESERVATION); 923 924 if (!parse_options((char *) data, sb, &opts)) 925 goto failed_mount; 926 927 sbi->s_mount_opt = opts.s_mount_opt; 928 sbi->s_resuid = opts.s_resuid; 929 sbi->s_resgid = opts.s_resgid; 930 931 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | 932 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? 933 SB_POSIXACL : 0); 934 sb->s_iflags |= SB_I_CGROUPWB; 935 936 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && 937 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || 938 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 939 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) 940 ext2_msg(sb, KERN_WARNING, 941 "warning: feature flags set on rev 0 fs, " 942 "running e2fsck is recommended"); 943 /* 944 * Check feature flags regardless of the revision level, since we 945 * previously didn't change the revision level when setting the flags, 946 * so there is a chance incompat flags are set on a rev 0 filesystem. 947 */ 948 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); 949 if (features) { 950 ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " 951 "unsupported optional features (%x)", 952 le32_to_cpu(features)); 953 goto failed_mount; 954 } 955 if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ 956 ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " 957 "unsupported optional features (%x)", 958 le32_to_cpu(features)); 959 goto failed_mount; 960 } 961 962 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); 963 964 if (sbi->s_mount_opt & EXT2_MOUNT_DAX) { 965 if (!bdev_dax_supported(sb->s_bdev, blocksize)) { 966 ext2_msg(sb, KERN_ERR, 967 "DAX unsupported by block device. Turning off DAX."); 968 sbi->s_mount_opt &= ~EXT2_MOUNT_DAX; 969 } 970 } 971 972 /* If the blocksize doesn't match, re-read the thing.. */ 973 if (sb->s_blocksize != blocksize) { 974 brelse(bh); 975 976 if (!sb_set_blocksize(sb, blocksize)) { 977 ext2_msg(sb, KERN_ERR, 978 "error: bad blocksize %d", blocksize); 979 goto failed_sbi; 980 } 981 982 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 983 offset = (sb_block*BLOCK_SIZE) % blocksize; 984 bh = sb_bread(sb, logic_sb_block); 985 if(!bh) { 986 ext2_msg(sb, KERN_ERR, "error: couldn't read" 987 "superblock on 2nd try"); 988 goto failed_sbi; 989 } 990 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 991 sbi->s_es = es; 992 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { 993 ext2_msg(sb, KERN_ERR, "error: magic mismatch"); 994 goto failed_mount; 995 } 996 } 997 998 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); 999 sb->s_max_links = EXT2_LINK_MAX; 1000 1001 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { 1002 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; 1003 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; 1004 } else { 1005 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 1006 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 1007 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || 1008 !is_power_of_2(sbi->s_inode_size) || 1009 (sbi->s_inode_size > blocksize)) { 1010 ext2_msg(sb, KERN_ERR, 1011 "error: unsupported inode size: %d", 1012 sbi->s_inode_size); 1013 goto failed_mount; 1014 } 1015 } 1016 1017 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << 1018 le32_to_cpu(es->s_log_frag_size); 1019 if (sbi->s_frag_size == 0) 1020 goto cantfind_ext2; 1021 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; 1022 1023 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 1024 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); 1025 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 1026 1027 if (EXT2_INODE_SIZE(sb) == 0) 1028 goto cantfind_ext2; 1029 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); 1030 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) 1031 goto cantfind_ext2; 1032 sbi->s_itb_per_group = sbi->s_inodes_per_group / 1033 sbi->s_inodes_per_block; 1034 sbi->s_desc_per_block = sb->s_blocksize / 1035 sizeof (struct ext2_group_desc); 1036 sbi->s_sbh = bh; 1037 sbi->s_mount_state = le16_to_cpu(es->s_state); 1038 sbi->s_addr_per_block_bits = 1039 ilog2 (EXT2_ADDR_PER_BLOCK(sb)); 1040 sbi->s_desc_per_block_bits = 1041 ilog2 (EXT2_DESC_PER_BLOCK(sb)); 1042 1043 if (sb->s_magic != EXT2_SUPER_MAGIC) 1044 goto cantfind_ext2; 1045 1046 if (sb->s_blocksize != bh->b_size) { 1047 if (!silent) 1048 ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); 1049 goto failed_mount; 1050 } 1051 1052 if (sb->s_blocksize != sbi->s_frag_size) { 1053 ext2_msg(sb, KERN_ERR, 1054 "error: fragsize %lu != blocksize %lu" 1055 "(not supported yet)", 1056 sbi->s_frag_size, sb->s_blocksize); 1057 goto failed_mount; 1058 } 1059 1060 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { 1061 ext2_msg(sb, KERN_ERR, 1062 "error: #blocks per group too big: %lu", 1063 sbi->s_blocks_per_group); 1064 goto failed_mount; 1065 } 1066 if (sbi->s_frags_per_group > sb->s_blocksize * 8) { 1067 ext2_msg(sb, KERN_ERR, 1068 "error: #fragments per group too big: %lu", 1069 sbi->s_frags_per_group); 1070 goto failed_mount; 1071 } 1072 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { 1073 ext2_msg(sb, KERN_ERR, 1074 "error: #inodes per group too big: %lu", 1075 sbi->s_inodes_per_group); 1076 goto failed_mount; 1077 } 1078 1079 if (EXT2_BLOCKS_PER_GROUP(sb) == 0) 1080 goto cantfind_ext2; 1081 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - 1082 le32_to_cpu(es->s_first_data_block) - 1) 1083 / EXT2_BLOCKS_PER_GROUP(sb)) + 1; 1084 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / 1085 EXT2_DESC_PER_BLOCK(sb); 1086 sbi->s_group_desc = kmalloc_array (db_count, 1087 sizeof(struct buffer_head *), 1088 GFP_KERNEL); 1089 if (sbi->s_group_desc == NULL) { 1090 ext2_msg(sb, KERN_ERR, "error: not enough memory"); 1091 goto failed_mount; 1092 } 1093 bgl_lock_init(sbi->s_blockgroup_lock); 1094 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); 1095 if (!sbi->s_debts) { 1096 ext2_msg(sb, KERN_ERR, "error: not enough memory"); 1097 goto failed_mount_group_desc; 1098 } 1099 for (i = 0; i < db_count; i++) { 1100 block = descriptor_loc(sb, logic_sb_block, i); 1101 sbi->s_group_desc[i] = sb_bread(sb, block); 1102 if (!sbi->s_group_desc[i]) { 1103 for (j = 0; j < i; j++) 1104 brelse (sbi->s_group_desc[j]); 1105 ext2_msg(sb, KERN_ERR, 1106 "error: unable to read group descriptors"); 1107 goto failed_mount_group_desc; 1108 } 1109 } 1110 if (!ext2_check_descriptors (sb)) { 1111 ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); 1112 goto failed_mount2; 1113 } 1114 sbi->s_gdb_count = db_count; 1115 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 1116 spin_lock_init(&sbi->s_next_gen_lock); 1117 1118 /* per fileystem reservation list head & lock */ 1119 spin_lock_init(&sbi->s_rsv_window_lock); 1120 sbi->s_rsv_window_root = RB_ROOT; 1121 /* 1122 * Add a single, static dummy reservation to the start of the 1123 * reservation window list --- it gives us a placeholder for 1124 * append-at-start-of-list which makes the allocation logic 1125 * _much_ simpler. 1126 */ 1127 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; 1128 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; 1129 sbi->s_rsv_window_head.rsv_alloc_hit = 0; 1130 sbi->s_rsv_window_head.rsv_goal_size = 0; 1131 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); 1132 1133 err = percpu_counter_init(&sbi->s_freeblocks_counter, 1134 ext2_count_free_blocks(sb), GFP_KERNEL); 1135 if (!err) { 1136 err = percpu_counter_init(&sbi->s_freeinodes_counter, 1137 ext2_count_free_inodes(sb), GFP_KERNEL); 1138 } 1139 if (!err) { 1140 err = percpu_counter_init(&sbi->s_dirs_counter, 1141 ext2_count_dirs(sb), GFP_KERNEL); 1142 } 1143 if (err) { 1144 ext2_msg(sb, KERN_ERR, "error: insufficient memory"); 1145 goto failed_mount3; 1146 } 1147 1148 #ifdef CONFIG_EXT2_FS_XATTR 1149 sbi->s_ea_block_cache = ext2_xattr_create_cache(); 1150 if (!sbi->s_ea_block_cache) { 1151 ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache"); 1152 goto failed_mount3; 1153 } 1154 #endif 1155 /* 1156 * set up enough so that it can read an inode 1157 */ 1158 sb->s_op = &ext2_sops; 1159 sb->s_export_op = &ext2_export_ops; 1160 sb->s_xattr = ext2_xattr_handlers; 1161 1162 #ifdef CONFIG_QUOTA 1163 sb->dq_op = &dquot_operations; 1164 sb->s_qcop = &ext2_quotactl_ops; 1165 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1166 #endif 1167 1168 root = ext2_iget(sb, EXT2_ROOT_INO); 1169 if (IS_ERR(root)) { 1170 ret = PTR_ERR(root); 1171 goto failed_mount3; 1172 } 1173 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 1174 iput(root); 1175 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); 1176 goto failed_mount3; 1177 } 1178 1179 sb->s_root = d_make_root(root); 1180 if (!sb->s_root) { 1181 ext2_msg(sb, KERN_ERR, "error: get root inode failed"); 1182 ret = -ENOMEM; 1183 goto failed_mount3; 1184 } 1185 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 1186 ext2_msg(sb, KERN_WARNING, 1187 "warning: mounting ext3 filesystem as ext2"); 1188 if (ext2_setup_super (sb, es, sb_rdonly(sb))) 1189 sb->s_flags |= SB_RDONLY; 1190 ext2_write_super(sb); 1191 return 0; 1192 1193 cantfind_ext2: 1194 if (!silent) 1195 ext2_msg(sb, KERN_ERR, 1196 "error: can't find an ext2 filesystem on dev %s.", 1197 sb->s_id); 1198 goto failed_mount; 1199 failed_mount3: 1200 if (sbi->s_ea_block_cache) 1201 ext2_xattr_destroy_cache(sbi->s_ea_block_cache); 1202 percpu_counter_destroy(&sbi->s_freeblocks_counter); 1203 percpu_counter_destroy(&sbi->s_freeinodes_counter); 1204 percpu_counter_destroy(&sbi->s_dirs_counter); 1205 failed_mount2: 1206 for (i = 0; i < db_count; i++) 1207 brelse(sbi->s_group_desc[i]); 1208 failed_mount_group_desc: 1209 kfree(sbi->s_group_desc); 1210 kfree(sbi->s_debts); 1211 failed_mount: 1212 brelse(bh); 1213 failed_sbi: 1214 sb->s_fs_info = NULL; 1215 kfree(sbi->s_blockgroup_lock); 1216 kfree(sbi); 1217 failed: 1218 fs_put_dax(dax_dev); 1219 return ret; 1220 } 1221 1222 static void ext2_clear_super_error(struct super_block *sb) 1223 { 1224 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; 1225 1226 if (buffer_write_io_error(sbh)) { 1227 /* 1228 * Oh, dear. A previous attempt to write the 1229 * superblock failed. This could happen because the 1230 * USB device was yanked out. Or it could happen to 1231 * be a transient write error and maybe the block will 1232 * be remapped. Nothing we can do but to retry the 1233 * write and hope for the best. 1234 */ 1235 ext2_msg(sb, KERN_ERR, 1236 "previous I/O error to superblock detected"); 1237 clear_buffer_write_io_error(sbh); 1238 set_buffer_uptodate(sbh); 1239 } 1240 } 1241 1242 void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, 1243 int wait) 1244 { 1245 ext2_clear_super_error(sb); 1246 spin_lock(&EXT2_SB(sb)->s_lock); 1247 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); 1248 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); 1249 es->s_wtime = cpu_to_le32(ktime_get_real_seconds()); 1250 /* unlock before we do IO */ 1251 spin_unlock(&EXT2_SB(sb)->s_lock); 1252 mark_buffer_dirty(EXT2_SB(sb)->s_sbh); 1253 if (wait) 1254 sync_dirty_buffer(EXT2_SB(sb)->s_sbh); 1255 } 1256 1257 /* 1258 * In the second extended file system, it is not necessary to 1259 * write the super block since we use a mapping of the 1260 * disk super block in a buffer. 1261 * 1262 * However, this function is still used to set the fs valid 1263 * flags to 0. We need to set this flag to 0 since the fs 1264 * may have been checked while mounted and e2fsck may have 1265 * set s_state to EXT2_VALID_FS after some corrections. 1266 */ 1267 static int ext2_sync_fs(struct super_block *sb, int wait) 1268 { 1269 struct ext2_sb_info *sbi = EXT2_SB(sb); 1270 struct ext2_super_block *es = EXT2_SB(sb)->s_es; 1271 1272 /* 1273 * Write quota structures to quota file, sync_blockdev() will write 1274 * them to disk later 1275 */ 1276 dquot_writeback_dquots(sb, -1); 1277 1278 spin_lock(&sbi->s_lock); 1279 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { 1280 ext2_debug("setting valid to 0\n"); 1281 es->s_state &= cpu_to_le16(~EXT2_VALID_FS); 1282 } 1283 spin_unlock(&sbi->s_lock); 1284 ext2_sync_super(sb, es, wait); 1285 return 0; 1286 } 1287 1288 static int ext2_freeze(struct super_block *sb) 1289 { 1290 struct ext2_sb_info *sbi = EXT2_SB(sb); 1291 1292 /* 1293 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared 1294 * because we have unattached inodes and thus filesystem is not fully 1295 * consistent. 1296 */ 1297 if (atomic_long_read(&sb->s_remove_count)) { 1298 ext2_sync_fs(sb, 1); 1299 return 0; 1300 } 1301 /* Set EXT2_FS_VALID flag */ 1302 spin_lock(&sbi->s_lock); 1303 sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state); 1304 spin_unlock(&sbi->s_lock); 1305 ext2_sync_super(sb, sbi->s_es, 1); 1306 1307 return 0; 1308 } 1309 1310 static int ext2_unfreeze(struct super_block *sb) 1311 { 1312 /* Just write sb to clear EXT2_VALID_FS flag */ 1313 ext2_write_super(sb); 1314 1315 return 0; 1316 } 1317 1318 static void ext2_write_super(struct super_block *sb) 1319 { 1320 if (!sb_rdonly(sb)) 1321 ext2_sync_fs(sb, 1); 1322 } 1323 1324 static int ext2_remount (struct super_block * sb, int * flags, char * data) 1325 { 1326 struct ext2_sb_info * sbi = EXT2_SB(sb); 1327 struct ext2_super_block * es; 1328 struct ext2_mount_options new_opts; 1329 int err; 1330 1331 sync_filesystem(sb); 1332 1333 spin_lock(&sbi->s_lock); 1334 new_opts.s_mount_opt = sbi->s_mount_opt; 1335 new_opts.s_resuid = sbi->s_resuid; 1336 new_opts.s_resgid = sbi->s_resgid; 1337 spin_unlock(&sbi->s_lock); 1338 1339 if (!parse_options(data, sb, &new_opts)) 1340 return -EINVAL; 1341 1342 spin_lock(&sbi->s_lock); 1343 es = sbi->s_es; 1344 if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) { 1345 ext2_msg(sb, KERN_WARNING, "warning: refusing change of " 1346 "dax flag with busy inodes while remounting"); 1347 new_opts.s_mount_opt ^= EXT2_MOUNT_DAX; 1348 } 1349 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) 1350 goto out_set; 1351 if (*flags & SB_RDONLY) { 1352 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || 1353 !(sbi->s_mount_state & EXT2_VALID_FS)) 1354 goto out_set; 1355 1356 /* 1357 * OK, we are remounting a valid rw partition rdonly, so set 1358 * the rdonly flag and then mark the partition as valid again. 1359 */ 1360 es->s_state = cpu_to_le16(sbi->s_mount_state); 1361 es->s_mtime = cpu_to_le32(ktime_get_real_seconds()); 1362 spin_unlock(&sbi->s_lock); 1363 1364 err = dquot_suspend(sb, -1); 1365 if (err < 0) 1366 return err; 1367 1368 ext2_sync_super(sb, es, 1); 1369 } else { 1370 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, 1371 ~EXT2_FEATURE_RO_COMPAT_SUPP); 1372 if (ret) { 1373 spin_unlock(&sbi->s_lock); 1374 ext2_msg(sb, KERN_WARNING, 1375 "warning: couldn't remount RDWR because of " 1376 "unsupported optional features (%x).", 1377 le32_to_cpu(ret)); 1378 return -EROFS; 1379 } 1380 /* 1381 * Mounting a RDONLY partition read-write, so reread and 1382 * store the current valid flag. (It may have been changed 1383 * by e2fsck since we originally mounted the partition.) 1384 */ 1385 sbi->s_mount_state = le16_to_cpu(es->s_state); 1386 if (!ext2_setup_super (sb, es, 0)) 1387 sb->s_flags &= ~SB_RDONLY; 1388 spin_unlock(&sbi->s_lock); 1389 1390 ext2_write_super(sb); 1391 1392 dquot_resume(sb, -1); 1393 } 1394 1395 spin_lock(&sbi->s_lock); 1396 out_set: 1397 sbi->s_mount_opt = new_opts.s_mount_opt; 1398 sbi->s_resuid = new_opts.s_resuid; 1399 sbi->s_resgid = new_opts.s_resgid; 1400 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | 1401 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? SB_POSIXACL : 0); 1402 spin_unlock(&sbi->s_lock); 1403 1404 return 0; 1405 } 1406 1407 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) 1408 { 1409 struct super_block *sb = dentry->d_sb; 1410 struct ext2_sb_info *sbi = EXT2_SB(sb); 1411 struct ext2_super_block *es = sbi->s_es; 1412 u64 fsid; 1413 1414 spin_lock(&sbi->s_lock); 1415 1416 if (test_opt (sb, MINIX_DF)) 1417 sbi->s_overhead_last = 0; 1418 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { 1419 unsigned long i, overhead = 0; 1420 smp_rmb(); 1421 1422 /* 1423 * Compute the overhead (FS structures). This is constant 1424 * for a given filesystem unless the number of block groups 1425 * changes so we cache the previous value until it does. 1426 */ 1427 1428 /* 1429 * All of the blocks before first_data_block are 1430 * overhead 1431 */ 1432 overhead = le32_to_cpu(es->s_first_data_block); 1433 1434 /* 1435 * Add the overhead attributed to the superblock and 1436 * block group descriptors. If the sparse superblocks 1437 * feature is turned on, then not all groups have this. 1438 */ 1439 for (i = 0; i < sbi->s_groups_count; i++) 1440 overhead += ext2_bg_has_super(sb, i) + 1441 ext2_bg_num_gdb(sb, i); 1442 1443 /* 1444 * Every block group has an inode bitmap, a block 1445 * bitmap, and an inode table. 1446 */ 1447 overhead += (sbi->s_groups_count * 1448 (2 + sbi->s_itb_per_group)); 1449 sbi->s_overhead_last = overhead; 1450 smp_wmb(); 1451 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); 1452 } 1453 1454 buf->f_type = EXT2_SUPER_MAGIC; 1455 buf->f_bsize = sb->s_blocksize; 1456 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; 1457 buf->f_bfree = ext2_count_free_blocks(sb); 1458 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); 1459 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); 1460 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) 1461 buf->f_bavail = 0; 1462 buf->f_files = le32_to_cpu(es->s_inodes_count); 1463 buf->f_ffree = ext2_count_free_inodes(sb); 1464 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); 1465 buf->f_namelen = EXT2_NAME_LEN; 1466 fsid = le64_to_cpup((void *)es->s_uuid) ^ 1467 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 1468 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 1469 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 1470 spin_unlock(&sbi->s_lock); 1471 return 0; 1472 } 1473 1474 static struct dentry *ext2_mount(struct file_system_type *fs_type, 1475 int flags, const char *dev_name, void *data) 1476 { 1477 return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super); 1478 } 1479 1480 #ifdef CONFIG_QUOTA 1481 1482 /* Read data from quotafile - avoid pagecache and such because we cannot afford 1483 * acquiring the locks... As quota files are never truncated and quota code 1484 * itself serializes the operations (and no one else should touch the files) 1485 * we don't have to be afraid of races */ 1486 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, 1487 size_t len, loff_t off) 1488 { 1489 struct inode *inode = sb_dqopt(sb)->files[type]; 1490 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1491 int err = 0; 1492 int offset = off & (sb->s_blocksize - 1); 1493 int tocopy; 1494 size_t toread; 1495 struct buffer_head tmp_bh; 1496 struct buffer_head *bh; 1497 loff_t i_size = i_size_read(inode); 1498 1499 if (off > i_size) 1500 return 0; 1501 if (off+len > i_size) 1502 len = i_size-off; 1503 toread = len; 1504 while (toread > 0) { 1505 tocopy = sb->s_blocksize - offset < toread ? 1506 sb->s_blocksize - offset : toread; 1507 1508 tmp_bh.b_state = 0; 1509 tmp_bh.b_size = sb->s_blocksize; 1510 err = ext2_get_block(inode, blk, &tmp_bh, 0); 1511 if (err < 0) 1512 return err; 1513 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 1514 memset(data, 0, tocopy); 1515 else { 1516 bh = sb_bread(sb, tmp_bh.b_blocknr); 1517 if (!bh) 1518 return -EIO; 1519 memcpy(data, bh->b_data+offset, tocopy); 1520 brelse(bh); 1521 } 1522 offset = 0; 1523 toread -= tocopy; 1524 data += tocopy; 1525 blk++; 1526 } 1527 return len; 1528 } 1529 1530 /* Write to quotafile */ 1531 static ssize_t ext2_quota_write(struct super_block *sb, int type, 1532 const char *data, size_t len, loff_t off) 1533 { 1534 struct inode *inode = sb_dqopt(sb)->files[type]; 1535 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1536 int err = 0; 1537 int offset = off & (sb->s_blocksize - 1); 1538 int tocopy; 1539 size_t towrite = len; 1540 struct buffer_head tmp_bh; 1541 struct buffer_head *bh; 1542 1543 while (towrite > 0) { 1544 tocopy = sb->s_blocksize - offset < towrite ? 1545 sb->s_blocksize - offset : towrite; 1546 1547 tmp_bh.b_state = 0; 1548 tmp_bh.b_size = sb->s_blocksize; 1549 err = ext2_get_block(inode, blk, &tmp_bh, 1); 1550 if (err < 0) 1551 goto out; 1552 if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) 1553 bh = sb_bread(sb, tmp_bh.b_blocknr); 1554 else 1555 bh = sb_getblk(sb, tmp_bh.b_blocknr); 1556 if (unlikely(!bh)) { 1557 err = -EIO; 1558 goto out; 1559 } 1560 lock_buffer(bh); 1561 memcpy(bh->b_data+offset, data, tocopy); 1562 flush_dcache_page(bh->b_page); 1563 set_buffer_uptodate(bh); 1564 mark_buffer_dirty(bh); 1565 unlock_buffer(bh); 1566 brelse(bh); 1567 offset = 0; 1568 towrite -= tocopy; 1569 data += tocopy; 1570 blk++; 1571 } 1572 out: 1573 if (len == towrite) 1574 return err; 1575 if (inode->i_size < off+len-towrite) 1576 i_size_write(inode, off+len-towrite); 1577 inode_inc_iversion(inode); 1578 inode->i_mtime = inode->i_ctime = current_time(inode); 1579 mark_inode_dirty(inode); 1580 return len - towrite; 1581 } 1582 1583 static int ext2_quota_on(struct super_block *sb, int type, int format_id, 1584 const struct path *path) 1585 { 1586 int err; 1587 struct inode *inode; 1588 1589 err = dquot_quota_on(sb, type, format_id, path); 1590 if (err) 1591 return err; 1592 1593 inode = d_inode(path->dentry); 1594 inode_lock(inode); 1595 EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL; 1596 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, 1597 S_NOATIME | S_IMMUTABLE); 1598 inode_unlock(inode); 1599 mark_inode_dirty(inode); 1600 1601 return 0; 1602 } 1603 1604 static int ext2_quota_off(struct super_block *sb, int type) 1605 { 1606 struct inode *inode = sb_dqopt(sb)->files[type]; 1607 int err; 1608 1609 if (!inode || !igrab(inode)) 1610 goto out; 1611 1612 err = dquot_quota_off(sb, type); 1613 if (err) 1614 goto out_put; 1615 1616 inode_lock(inode); 1617 EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL); 1618 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); 1619 inode_unlock(inode); 1620 mark_inode_dirty(inode); 1621 out_put: 1622 iput(inode); 1623 return err; 1624 out: 1625 return dquot_quota_off(sb, type); 1626 } 1627 1628 #endif 1629 1630 static struct file_system_type ext2_fs_type = { 1631 .owner = THIS_MODULE, 1632 .name = "ext2", 1633 .mount = ext2_mount, 1634 .kill_sb = kill_block_super, 1635 .fs_flags = FS_REQUIRES_DEV, 1636 }; 1637 MODULE_ALIAS_FS("ext2"); 1638 1639 static int __init init_ext2_fs(void) 1640 { 1641 int err; 1642 1643 err = init_inodecache(); 1644 if (err) 1645 return err; 1646 err = register_filesystem(&ext2_fs_type); 1647 if (err) 1648 goto out; 1649 return 0; 1650 out: 1651 destroy_inodecache(); 1652 return err; 1653 } 1654 1655 static void __exit exit_ext2_fs(void) 1656 { 1657 unregister_filesystem(&ext2_fs_type); 1658 destroy_inodecache(); 1659 } 1660 1661 MODULE_AUTHOR("Remy Card and others"); 1662 MODULE_DESCRIPTION("Second Extended Filesystem"); 1663 MODULE_LICENSE("GPL"); 1664 module_init(init_ext2_fs) 1665 module_exit(exit_ext2_fs) 1666