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 defined(CONFIG_QUOTA) 313 if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA) 314 seq_puts(seq, ",usrquota"); 315 316 if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA) 317 seq_puts(seq, ",grpquota"); 318 #endif 319 320 #ifdef CONFIG_FS_DAX 321 if (sbi->s_mount_opt & EXT2_MOUNT_XIP) 322 seq_puts(seq, ",xip"); 323 if (sbi->s_mount_opt & EXT2_MOUNT_DAX) 324 seq_puts(seq, ",dax"); 325 #endif 326 327 if (!test_opt(sb, RESERVATION)) 328 seq_puts(seq, ",noreservation"); 329 330 spin_unlock(&sbi->s_lock); 331 return 0; 332 } 333 334 #ifdef CONFIG_QUOTA 335 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); 336 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); 337 static int ext2_quota_on(struct super_block *sb, int type, int format_id, 338 const struct path *path); 339 static struct dquot **ext2_get_dquots(struct inode *inode) 340 { 341 return EXT2_I(inode)->i_dquot; 342 } 343 344 static const struct quotactl_ops ext2_quotactl_ops = { 345 .quota_on = ext2_quota_on, 346 .quota_off = ext2_quota_off, 347 .quota_sync = dquot_quota_sync, 348 .get_state = dquot_get_state, 349 .set_info = dquot_set_dqinfo, 350 .get_dqblk = dquot_get_dqblk, 351 .set_dqblk = dquot_set_dqblk, 352 .get_nextdqblk = dquot_get_next_dqblk, 353 }; 354 #endif 355 356 static const struct super_operations ext2_sops = { 357 .alloc_inode = ext2_alloc_inode, 358 .destroy_inode = ext2_destroy_inode, 359 .write_inode = ext2_write_inode, 360 .evict_inode = ext2_evict_inode, 361 .put_super = ext2_put_super, 362 .sync_fs = ext2_sync_fs, 363 .freeze_fs = ext2_freeze, 364 .unfreeze_fs = ext2_unfreeze, 365 .statfs = ext2_statfs, 366 .remount_fs = ext2_remount, 367 .show_options = ext2_show_options, 368 #ifdef CONFIG_QUOTA 369 .quota_read = ext2_quota_read, 370 .quota_write = ext2_quota_write, 371 .get_dquots = ext2_get_dquots, 372 #endif 373 }; 374 375 static struct inode *ext2_nfs_get_inode(struct super_block *sb, 376 u64 ino, u32 generation) 377 { 378 struct inode *inode; 379 380 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) 381 return ERR_PTR(-ESTALE); 382 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) 383 return ERR_PTR(-ESTALE); 384 385 /* 386 * ext2_iget isn't quite right if the inode is currently unallocated! 387 * However ext2_iget currently does appropriate checks to handle stale 388 * inodes so everything is OK. 389 */ 390 inode = ext2_iget(sb, ino); 391 if (IS_ERR(inode)) 392 return ERR_CAST(inode); 393 if (generation && inode->i_generation != generation) { 394 /* we didn't find the right inode.. */ 395 iput(inode); 396 return ERR_PTR(-ESTALE); 397 } 398 return inode; 399 } 400 401 static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid, 402 int fh_len, int fh_type) 403 { 404 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 405 ext2_nfs_get_inode); 406 } 407 408 static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid, 409 int fh_len, int fh_type) 410 { 411 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 412 ext2_nfs_get_inode); 413 } 414 415 static const struct export_operations ext2_export_ops = { 416 .fh_to_dentry = ext2_fh_to_dentry, 417 .fh_to_parent = ext2_fh_to_parent, 418 .get_parent = ext2_get_parent, 419 }; 420 421 static unsigned long get_sb_block(void **data) 422 { 423 unsigned long sb_block; 424 char *options = (char *) *data; 425 426 if (!options || strncmp(options, "sb=", 3) != 0) 427 return 1; /* Default location */ 428 options += 3; 429 sb_block = simple_strtoul(options, &options, 0); 430 if (*options && *options != ',') { 431 printk("EXT2-fs: Invalid sb specification: %s\n", 432 (char *) *data); 433 return 1; 434 } 435 if (*options == ',') 436 options++; 437 *data = (void *) options; 438 return sb_block; 439 } 440 441 enum { 442 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 443 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, 444 Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug, 445 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, 446 Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota, 447 Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation 448 }; 449 450 static const match_table_t tokens = { 451 {Opt_bsd_df, "bsddf"}, 452 {Opt_minix_df, "minixdf"}, 453 {Opt_grpid, "grpid"}, 454 {Opt_grpid, "bsdgroups"}, 455 {Opt_nogrpid, "nogrpid"}, 456 {Opt_nogrpid, "sysvgroups"}, 457 {Opt_resgid, "resgid=%u"}, 458 {Opt_resuid, "resuid=%u"}, 459 {Opt_sb, "sb=%u"}, 460 {Opt_err_cont, "errors=continue"}, 461 {Opt_err_panic, "errors=panic"}, 462 {Opt_err_ro, "errors=remount-ro"}, 463 {Opt_nouid32, "nouid32"}, 464 {Opt_nocheck, "check=none"}, 465 {Opt_nocheck, "nocheck"}, 466 {Opt_debug, "debug"}, 467 {Opt_oldalloc, "oldalloc"}, 468 {Opt_orlov, "orlov"}, 469 {Opt_nobh, "nobh"}, 470 {Opt_user_xattr, "user_xattr"}, 471 {Opt_nouser_xattr, "nouser_xattr"}, 472 {Opt_acl, "acl"}, 473 {Opt_noacl, "noacl"}, 474 {Opt_xip, "xip"}, 475 {Opt_dax, "dax"}, 476 {Opt_grpquota, "grpquota"}, 477 {Opt_ignore, "noquota"}, 478 {Opt_quota, "quota"}, 479 {Opt_usrquota, "usrquota"}, 480 {Opt_reservation, "reservation"}, 481 {Opt_noreservation, "noreservation"}, 482 {Opt_err, NULL} 483 }; 484 485 static int parse_options(char *options, struct super_block *sb, 486 struct ext2_mount_options *opts) 487 { 488 char *p; 489 substring_t args[MAX_OPT_ARGS]; 490 int option; 491 kuid_t uid; 492 kgid_t gid; 493 494 if (!options) 495 return 1; 496 497 while ((p = strsep (&options, ",")) != NULL) { 498 int token; 499 if (!*p) 500 continue; 501 502 token = match_token(p, tokens, args); 503 switch (token) { 504 case Opt_bsd_df: 505 clear_opt (opts->s_mount_opt, MINIX_DF); 506 break; 507 case Opt_minix_df: 508 set_opt (opts->s_mount_opt, MINIX_DF); 509 break; 510 case Opt_grpid: 511 set_opt (opts->s_mount_opt, GRPID); 512 break; 513 case Opt_nogrpid: 514 clear_opt (opts->s_mount_opt, GRPID); 515 break; 516 case Opt_resuid: 517 if (match_int(&args[0], &option)) 518 return 0; 519 uid = make_kuid(current_user_ns(), option); 520 if (!uid_valid(uid)) { 521 ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option); 522 return 0; 523 524 } 525 opts->s_resuid = uid; 526 break; 527 case Opt_resgid: 528 if (match_int(&args[0], &option)) 529 return 0; 530 gid = make_kgid(current_user_ns(), option); 531 if (!gid_valid(gid)) { 532 ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option); 533 return 0; 534 } 535 opts->s_resgid = gid; 536 break; 537 case Opt_sb: 538 /* handled by get_sb_block() instead of here */ 539 /* *sb_block = match_int(&args[0]); */ 540 break; 541 case Opt_err_panic: 542 clear_opt (opts->s_mount_opt, ERRORS_CONT); 543 clear_opt (opts->s_mount_opt, ERRORS_RO); 544 set_opt (opts->s_mount_opt, ERRORS_PANIC); 545 break; 546 case Opt_err_ro: 547 clear_opt (opts->s_mount_opt, ERRORS_CONT); 548 clear_opt (opts->s_mount_opt, ERRORS_PANIC); 549 set_opt (opts->s_mount_opt, ERRORS_RO); 550 break; 551 case Opt_err_cont: 552 clear_opt (opts->s_mount_opt, ERRORS_RO); 553 clear_opt (opts->s_mount_opt, ERRORS_PANIC); 554 set_opt (opts->s_mount_opt, ERRORS_CONT); 555 break; 556 case Opt_nouid32: 557 set_opt (opts->s_mount_opt, NO_UID32); 558 break; 559 case Opt_nocheck: 560 ext2_msg(sb, KERN_WARNING, 561 "Option nocheck/check=none is deprecated and" 562 " will be removed in June 2020."); 563 clear_opt (opts->s_mount_opt, CHECK); 564 break; 565 case Opt_debug: 566 set_opt (opts->s_mount_opt, DEBUG); 567 break; 568 case Opt_oldalloc: 569 set_opt (opts->s_mount_opt, OLDALLOC); 570 break; 571 case Opt_orlov: 572 clear_opt (opts->s_mount_opt, OLDALLOC); 573 break; 574 case Opt_nobh: 575 set_opt (opts->s_mount_opt, NOBH); 576 break; 577 #ifdef CONFIG_EXT2_FS_XATTR 578 case Opt_user_xattr: 579 set_opt (opts->s_mount_opt, XATTR_USER); 580 break; 581 case Opt_nouser_xattr: 582 clear_opt (opts->s_mount_opt, XATTR_USER); 583 break; 584 #else 585 case Opt_user_xattr: 586 case Opt_nouser_xattr: 587 ext2_msg(sb, KERN_INFO, "(no)user_xattr options" 588 "not supported"); 589 break; 590 #endif 591 #ifdef CONFIG_EXT2_FS_POSIX_ACL 592 case Opt_acl: 593 set_opt(opts->s_mount_opt, POSIX_ACL); 594 break; 595 case Opt_noacl: 596 clear_opt(opts->s_mount_opt, POSIX_ACL); 597 break; 598 #else 599 case Opt_acl: 600 case Opt_noacl: 601 ext2_msg(sb, KERN_INFO, 602 "(no)acl options not supported"); 603 break; 604 #endif 605 case Opt_xip: 606 ext2_msg(sb, KERN_INFO, "use dax instead of xip"); 607 set_opt(opts->s_mount_opt, XIP); 608 /* Fall through */ 609 case Opt_dax: 610 #ifdef CONFIG_FS_DAX 611 ext2_msg(sb, KERN_WARNING, 612 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); 613 set_opt(opts->s_mount_opt, DAX); 614 #else 615 ext2_msg(sb, KERN_INFO, "dax option not supported"); 616 #endif 617 break; 618 619 #if defined(CONFIG_QUOTA) 620 case Opt_quota: 621 case Opt_usrquota: 622 set_opt(opts->s_mount_opt, USRQUOTA); 623 break; 624 625 case Opt_grpquota: 626 set_opt(opts->s_mount_opt, GRPQUOTA); 627 break; 628 #else 629 case Opt_quota: 630 case Opt_usrquota: 631 case Opt_grpquota: 632 ext2_msg(sb, KERN_INFO, 633 "quota operations not supported"); 634 break; 635 #endif 636 637 case Opt_reservation: 638 set_opt(opts->s_mount_opt, RESERVATION); 639 ext2_msg(sb, KERN_INFO, "reservations ON"); 640 break; 641 case Opt_noreservation: 642 clear_opt(opts->s_mount_opt, RESERVATION); 643 ext2_msg(sb, KERN_INFO, "reservations OFF"); 644 break; 645 case Opt_ignore: 646 break; 647 default: 648 return 0; 649 } 650 } 651 return 1; 652 } 653 654 static int ext2_setup_super (struct super_block * sb, 655 struct ext2_super_block * es, 656 int read_only) 657 { 658 int res = 0; 659 struct ext2_sb_info *sbi = EXT2_SB(sb); 660 661 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { 662 ext2_msg(sb, KERN_ERR, 663 "error: revision level too high, " 664 "forcing read-only mode"); 665 res = SB_RDONLY; 666 } 667 if (read_only) 668 return res; 669 if (!(sbi->s_mount_state & EXT2_VALID_FS)) 670 ext2_msg(sb, KERN_WARNING, 671 "warning: mounting unchecked fs, " 672 "running e2fsck is recommended"); 673 else if ((sbi->s_mount_state & EXT2_ERROR_FS)) 674 ext2_msg(sb, KERN_WARNING, 675 "warning: mounting fs with errors, " 676 "running e2fsck is recommended"); 677 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 678 le16_to_cpu(es->s_mnt_count) >= 679 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 680 ext2_msg(sb, KERN_WARNING, 681 "warning: maximal mount count reached, " 682 "running e2fsck is recommended"); 683 else if (le32_to_cpu(es->s_checkinterval) && 684 (le32_to_cpu(es->s_lastcheck) + 685 le32_to_cpu(es->s_checkinterval) <= 686 ktime_get_real_seconds())) 687 ext2_msg(sb, KERN_WARNING, 688 "warning: checktime reached, " 689 "running e2fsck is recommended"); 690 if (!le16_to_cpu(es->s_max_mnt_count)) 691 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); 692 le16_add_cpu(&es->s_mnt_count, 1); 693 if (test_opt (sb, DEBUG)) 694 ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, " 695 "bpg=%lu, ipg=%lu, mo=%04lx]", 696 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, 697 sbi->s_frag_size, 698 sbi->s_groups_count, 699 EXT2_BLOCKS_PER_GROUP(sb), 700 EXT2_INODES_PER_GROUP(sb), 701 sbi->s_mount_opt); 702 return res; 703 } 704 705 static int ext2_check_descriptors(struct super_block *sb) 706 { 707 int i; 708 struct ext2_sb_info *sbi = EXT2_SB(sb); 709 710 ext2_debug ("Checking group descriptors"); 711 712 for (i = 0; i < sbi->s_groups_count; i++) { 713 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL); 714 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i); 715 ext2_fsblk_t last_block; 716 717 if (i == sbi->s_groups_count - 1) 718 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; 719 else 720 last_block = first_block + 721 (EXT2_BLOCKS_PER_GROUP(sb) - 1); 722 723 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || 724 le32_to_cpu(gdp->bg_block_bitmap) > last_block) 725 { 726 ext2_error (sb, "ext2_check_descriptors", 727 "Block bitmap for group %d" 728 " not in group (block %lu)!", 729 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); 730 return 0; 731 } 732 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || 733 le32_to_cpu(gdp->bg_inode_bitmap) > last_block) 734 { 735 ext2_error (sb, "ext2_check_descriptors", 736 "Inode bitmap for group %d" 737 " not in group (block %lu)!", 738 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); 739 return 0; 740 } 741 if (le32_to_cpu(gdp->bg_inode_table) < first_block || 742 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > 743 last_block) 744 { 745 ext2_error (sb, "ext2_check_descriptors", 746 "Inode table for group %d" 747 " not in group (block %lu)!", 748 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); 749 return 0; 750 } 751 } 752 return 1; 753 } 754 755 /* 756 * Maximal file size. There is a direct, and {,double-,triple-}indirect 757 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. 758 * We need to be 1 filesystem block less than the 2^32 sector limit. 759 */ 760 static loff_t ext2_max_size(int bits) 761 { 762 loff_t res = EXT2_NDIR_BLOCKS; 763 int meta_blocks; 764 loff_t upper_limit; 765 766 /* This is calculated to be the largest file size for a 767 * dense, file such that the total number of 768 * sectors in the file, including data and all indirect blocks, 769 * does not exceed 2^32 -1 770 * __u32 i_blocks representing the total number of 771 * 512 bytes blocks of the file 772 */ 773 upper_limit = (1LL << 32) - 1; 774 775 /* total blocks in file system block size */ 776 upper_limit >>= (bits - 9); 777 778 779 /* indirect blocks */ 780 meta_blocks = 1; 781 /* double indirect blocks */ 782 meta_blocks += 1 + (1LL << (bits-2)); 783 /* tripple indirect blocks */ 784 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); 785 786 upper_limit -= meta_blocks; 787 upper_limit <<= bits; 788 789 res += 1LL << (bits-2); 790 res += 1LL << (2*(bits-2)); 791 res += 1LL << (3*(bits-2)); 792 res <<= bits; 793 if (res > upper_limit) 794 res = upper_limit; 795 796 if (res > MAX_LFS_FILESIZE) 797 res = MAX_LFS_FILESIZE; 798 799 return res; 800 } 801 802 static unsigned long descriptor_loc(struct super_block *sb, 803 unsigned long logic_sb_block, 804 int nr) 805 { 806 struct ext2_sb_info *sbi = EXT2_SB(sb); 807 unsigned long bg, first_meta_bg; 808 int has_super = 0; 809 810 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 811 812 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || 813 nr < first_meta_bg) 814 return (logic_sb_block + nr + 1); 815 bg = sbi->s_desc_per_block * nr; 816 if (ext2_bg_has_super(sb, bg)) 817 has_super = 1; 818 819 return ext2_group_first_block_no(sb, bg) + has_super; 820 } 821 822 static int ext2_fill_super(struct super_block *sb, void *data, int silent) 823 { 824 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev); 825 struct buffer_head * bh; 826 struct ext2_sb_info * sbi; 827 struct ext2_super_block * es; 828 struct inode *root; 829 unsigned long block; 830 unsigned long sb_block = get_sb_block(&data); 831 unsigned long logic_sb_block; 832 unsigned long offset = 0; 833 unsigned long def_mount_opts; 834 long ret = -ENOMEM; 835 int blocksize = BLOCK_SIZE; 836 int db_count; 837 int i, j; 838 __le32 features; 839 int err; 840 struct ext2_mount_options opts; 841 842 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 843 if (!sbi) 844 goto failed; 845 846 sbi->s_blockgroup_lock = 847 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); 848 if (!sbi->s_blockgroup_lock) { 849 kfree(sbi); 850 goto failed; 851 } 852 sb->s_fs_info = sbi; 853 sbi->s_sb_block = sb_block; 854 sbi->s_daxdev = dax_dev; 855 856 spin_lock_init(&sbi->s_lock); 857 ret = -EINVAL; 858 859 /* 860 * See what the current blocksize for the device is, and 861 * use that as the blocksize. Otherwise (or if the blocksize 862 * is smaller than the default) use the default. 863 * This is important for devices that have a hardware 864 * sectorsize that is larger than the default. 865 */ 866 blocksize = sb_min_blocksize(sb, BLOCK_SIZE); 867 if (!blocksize) { 868 ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); 869 goto failed_sbi; 870 } 871 872 /* 873 * If the superblock doesn't start on a hardware sector boundary, 874 * calculate the offset. 875 */ 876 if (blocksize != BLOCK_SIZE) { 877 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 878 offset = (sb_block*BLOCK_SIZE) % blocksize; 879 } else { 880 logic_sb_block = sb_block; 881 } 882 883 if (!(bh = sb_bread(sb, logic_sb_block))) { 884 ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); 885 goto failed_sbi; 886 } 887 /* 888 * Note: s_es must be initialized as soon as possible because 889 * some ext2 macro-instructions depend on its value 890 */ 891 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 892 sbi->s_es = es; 893 sb->s_magic = le16_to_cpu(es->s_magic); 894 895 if (sb->s_magic != EXT2_SUPER_MAGIC) 896 goto cantfind_ext2; 897 898 /* Set defaults before we parse the mount options */ 899 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 900 if (def_mount_opts & EXT2_DEFM_DEBUG) 901 set_opt(opts.s_mount_opt, DEBUG); 902 if (def_mount_opts & EXT2_DEFM_BSDGROUPS) 903 set_opt(opts.s_mount_opt, GRPID); 904 if (def_mount_opts & EXT2_DEFM_UID16) 905 set_opt(opts.s_mount_opt, NO_UID32); 906 #ifdef CONFIG_EXT2_FS_XATTR 907 if (def_mount_opts & EXT2_DEFM_XATTR_USER) 908 set_opt(opts.s_mount_opt, XATTR_USER); 909 #endif 910 #ifdef CONFIG_EXT2_FS_POSIX_ACL 911 if (def_mount_opts & EXT2_DEFM_ACL) 912 set_opt(opts.s_mount_opt, POSIX_ACL); 913 #endif 914 915 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) 916 set_opt(opts.s_mount_opt, ERRORS_PANIC); 917 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) 918 set_opt(opts.s_mount_opt, ERRORS_CONT); 919 else 920 set_opt(opts.s_mount_opt, ERRORS_RO); 921 922 opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); 923 opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); 924 925 set_opt(opts.s_mount_opt, RESERVATION); 926 927 if (!parse_options((char *) data, sb, &opts)) 928 goto failed_mount; 929 930 sbi->s_mount_opt = opts.s_mount_opt; 931 sbi->s_resuid = opts.s_resuid; 932 sbi->s_resgid = opts.s_resgid; 933 934 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | 935 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? 936 SB_POSIXACL : 0); 937 sb->s_iflags |= SB_I_CGROUPWB; 938 939 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && 940 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || 941 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 942 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) 943 ext2_msg(sb, KERN_WARNING, 944 "warning: feature flags set on rev 0 fs, " 945 "running e2fsck is recommended"); 946 /* 947 * Check feature flags regardless of the revision level, since we 948 * previously didn't change the revision level when setting the flags, 949 * so there is a chance incompat flags are set on a rev 0 filesystem. 950 */ 951 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); 952 if (features) { 953 ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " 954 "unsupported optional features (%x)", 955 le32_to_cpu(features)); 956 goto failed_mount; 957 } 958 if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ 959 ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " 960 "unsupported optional features (%x)", 961 le32_to_cpu(features)); 962 goto failed_mount; 963 } 964 965 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); 966 967 if (sbi->s_mount_opt & EXT2_MOUNT_DAX) { 968 if (!bdev_dax_supported(sb->s_bdev, blocksize)) { 969 ext2_msg(sb, KERN_ERR, 970 "DAX unsupported by block device. Turning off DAX."); 971 sbi->s_mount_opt &= ~EXT2_MOUNT_DAX; 972 } 973 } 974 975 /* If the blocksize doesn't match, re-read the thing.. */ 976 if (sb->s_blocksize != blocksize) { 977 brelse(bh); 978 979 if (!sb_set_blocksize(sb, blocksize)) { 980 ext2_msg(sb, KERN_ERR, 981 "error: bad blocksize %d", blocksize); 982 goto failed_sbi; 983 } 984 985 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 986 offset = (sb_block*BLOCK_SIZE) % blocksize; 987 bh = sb_bread(sb, logic_sb_block); 988 if(!bh) { 989 ext2_msg(sb, KERN_ERR, "error: couldn't read" 990 "superblock on 2nd try"); 991 goto failed_sbi; 992 } 993 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 994 sbi->s_es = es; 995 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { 996 ext2_msg(sb, KERN_ERR, "error: magic mismatch"); 997 goto failed_mount; 998 } 999 } 1000 1001 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); 1002 sb->s_max_links = EXT2_LINK_MAX; 1003 1004 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { 1005 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; 1006 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; 1007 } else { 1008 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 1009 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 1010 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || 1011 !is_power_of_2(sbi->s_inode_size) || 1012 (sbi->s_inode_size > blocksize)) { 1013 ext2_msg(sb, KERN_ERR, 1014 "error: unsupported inode size: %d", 1015 sbi->s_inode_size); 1016 goto failed_mount; 1017 } 1018 } 1019 1020 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << 1021 le32_to_cpu(es->s_log_frag_size); 1022 if (sbi->s_frag_size == 0) 1023 goto cantfind_ext2; 1024 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; 1025 1026 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 1027 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); 1028 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 1029 1030 if (EXT2_INODE_SIZE(sb) == 0) 1031 goto cantfind_ext2; 1032 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); 1033 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) 1034 goto cantfind_ext2; 1035 sbi->s_itb_per_group = sbi->s_inodes_per_group / 1036 sbi->s_inodes_per_block; 1037 sbi->s_desc_per_block = sb->s_blocksize / 1038 sizeof (struct ext2_group_desc); 1039 sbi->s_sbh = bh; 1040 sbi->s_mount_state = le16_to_cpu(es->s_state); 1041 sbi->s_addr_per_block_bits = 1042 ilog2 (EXT2_ADDR_PER_BLOCK(sb)); 1043 sbi->s_desc_per_block_bits = 1044 ilog2 (EXT2_DESC_PER_BLOCK(sb)); 1045 1046 if (sb->s_magic != EXT2_SUPER_MAGIC) 1047 goto cantfind_ext2; 1048 1049 if (sb->s_blocksize != bh->b_size) { 1050 if (!silent) 1051 ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); 1052 goto failed_mount; 1053 } 1054 1055 if (sb->s_blocksize != sbi->s_frag_size) { 1056 ext2_msg(sb, KERN_ERR, 1057 "error: fragsize %lu != blocksize %lu" 1058 "(not supported yet)", 1059 sbi->s_frag_size, sb->s_blocksize); 1060 goto failed_mount; 1061 } 1062 1063 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { 1064 ext2_msg(sb, KERN_ERR, 1065 "error: #blocks per group too big: %lu", 1066 sbi->s_blocks_per_group); 1067 goto failed_mount; 1068 } 1069 if (sbi->s_frags_per_group > sb->s_blocksize * 8) { 1070 ext2_msg(sb, KERN_ERR, 1071 "error: #fragments per group too big: %lu", 1072 sbi->s_frags_per_group); 1073 goto failed_mount; 1074 } 1075 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { 1076 ext2_msg(sb, KERN_ERR, 1077 "error: #inodes per group too big: %lu", 1078 sbi->s_inodes_per_group); 1079 goto failed_mount; 1080 } 1081 1082 if (EXT2_BLOCKS_PER_GROUP(sb) == 0) 1083 goto cantfind_ext2; 1084 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - 1085 le32_to_cpu(es->s_first_data_block) - 1) 1086 / EXT2_BLOCKS_PER_GROUP(sb)) + 1; 1087 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / 1088 EXT2_DESC_PER_BLOCK(sb); 1089 sbi->s_group_desc = kmalloc_array (db_count, 1090 sizeof(struct buffer_head *), 1091 GFP_KERNEL); 1092 if (sbi->s_group_desc == NULL) { 1093 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 ext2_msg(sb, KERN_ERR, "error: not enough memory"); 1100 goto failed_mount_group_desc; 1101 } 1102 for (i = 0; i < db_count; i++) { 1103 block = descriptor_loc(sb, logic_sb_block, i); 1104 sbi->s_group_desc[i] = sb_bread(sb, block); 1105 if (!sbi->s_group_desc[i]) { 1106 for (j = 0; j < i; j++) 1107 brelse (sbi->s_group_desc[j]); 1108 ext2_msg(sb, KERN_ERR, 1109 "error: unable to read group descriptors"); 1110 goto failed_mount_group_desc; 1111 } 1112 } 1113 if (!ext2_check_descriptors (sb)) { 1114 ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); 1115 goto failed_mount2; 1116 } 1117 sbi->s_gdb_count = db_count; 1118 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 1119 spin_lock_init(&sbi->s_next_gen_lock); 1120 1121 /* per fileystem reservation list head & lock */ 1122 spin_lock_init(&sbi->s_rsv_window_lock); 1123 sbi->s_rsv_window_root = RB_ROOT; 1124 /* 1125 * Add a single, static dummy reservation to the start of the 1126 * reservation window list --- it gives us a placeholder for 1127 * append-at-start-of-list which makes the allocation logic 1128 * _much_ simpler. 1129 */ 1130 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; 1131 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; 1132 sbi->s_rsv_window_head.rsv_alloc_hit = 0; 1133 sbi->s_rsv_window_head.rsv_goal_size = 0; 1134 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); 1135 1136 err = percpu_counter_init(&sbi->s_freeblocks_counter, 1137 ext2_count_free_blocks(sb), GFP_KERNEL); 1138 if (!err) { 1139 err = percpu_counter_init(&sbi->s_freeinodes_counter, 1140 ext2_count_free_inodes(sb), GFP_KERNEL); 1141 } 1142 if (!err) { 1143 err = percpu_counter_init(&sbi->s_dirs_counter, 1144 ext2_count_dirs(sb), GFP_KERNEL); 1145 } 1146 if (err) { 1147 ext2_msg(sb, KERN_ERR, "error: insufficient memory"); 1148 goto failed_mount3; 1149 } 1150 1151 #ifdef CONFIG_EXT2_FS_XATTR 1152 sbi->s_ea_block_cache = ext2_xattr_create_cache(); 1153 if (!sbi->s_ea_block_cache) { 1154 ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache"); 1155 goto failed_mount3; 1156 } 1157 #endif 1158 /* 1159 * set up enough so that it can read an inode 1160 */ 1161 sb->s_op = &ext2_sops; 1162 sb->s_export_op = &ext2_export_ops; 1163 sb->s_xattr = ext2_xattr_handlers; 1164 1165 #ifdef CONFIG_QUOTA 1166 sb->dq_op = &dquot_operations; 1167 sb->s_qcop = &ext2_quotactl_ops; 1168 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1169 #endif 1170 1171 root = ext2_iget(sb, EXT2_ROOT_INO); 1172 if (IS_ERR(root)) { 1173 ret = PTR_ERR(root); 1174 goto failed_mount3; 1175 } 1176 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 1177 iput(root); 1178 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); 1179 goto failed_mount3; 1180 } 1181 1182 sb->s_root = d_make_root(root); 1183 if (!sb->s_root) { 1184 ext2_msg(sb, KERN_ERR, "error: get root inode failed"); 1185 ret = -ENOMEM; 1186 goto failed_mount3; 1187 } 1188 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 1189 ext2_msg(sb, KERN_WARNING, 1190 "warning: mounting ext3 filesystem as ext2"); 1191 if (ext2_setup_super (sb, es, sb_rdonly(sb))) 1192 sb->s_flags |= SB_RDONLY; 1193 ext2_write_super(sb); 1194 return 0; 1195 1196 cantfind_ext2: 1197 if (!silent) 1198 ext2_msg(sb, KERN_ERR, 1199 "error: can't find an ext2 filesystem on dev %s.", 1200 sb->s_id); 1201 goto failed_mount; 1202 failed_mount3: 1203 if (sbi->s_ea_block_cache) 1204 ext2_xattr_destroy_cache(sbi->s_ea_block_cache); 1205 percpu_counter_destroy(&sbi->s_freeblocks_counter); 1206 percpu_counter_destroy(&sbi->s_freeinodes_counter); 1207 percpu_counter_destroy(&sbi->s_dirs_counter); 1208 failed_mount2: 1209 for (i = 0; i < db_count; i++) 1210 brelse(sbi->s_group_desc[i]); 1211 failed_mount_group_desc: 1212 kfree(sbi->s_group_desc); 1213 kfree(sbi->s_debts); 1214 failed_mount: 1215 brelse(bh); 1216 failed_sbi: 1217 sb->s_fs_info = NULL; 1218 kfree(sbi->s_blockgroup_lock); 1219 kfree(sbi); 1220 failed: 1221 fs_put_dax(dax_dev); 1222 return ret; 1223 } 1224 1225 static void ext2_clear_super_error(struct super_block *sb) 1226 { 1227 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; 1228 1229 if (buffer_write_io_error(sbh)) { 1230 /* 1231 * Oh, dear. A previous attempt to write the 1232 * superblock failed. This could happen because the 1233 * USB device was yanked out. Or it could happen to 1234 * be a transient write error and maybe the block will 1235 * be remapped. Nothing we can do but to retry the 1236 * write and hope for the best. 1237 */ 1238 ext2_msg(sb, KERN_ERR, 1239 "previous I/O error to superblock detected"); 1240 clear_buffer_write_io_error(sbh); 1241 set_buffer_uptodate(sbh); 1242 } 1243 } 1244 1245 void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, 1246 int wait) 1247 { 1248 ext2_clear_super_error(sb); 1249 spin_lock(&EXT2_SB(sb)->s_lock); 1250 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); 1251 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); 1252 es->s_wtime = cpu_to_le32(ktime_get_real_seconds()); 1253 /* unlock before we do IO */ 1254 spin_unlock(&EXT2_SB(sb)->s_lock); 1255 mark_buffer_dirty(EXT2_SB(sb)->s_sbh); 1256 if (wait) 1257 sync_dirty_buffer(EXT2_SB(sb)->s_sbh); 1258 } 1259 1260 /* 1261 * In the second extended file system, it is not necessary to 1262 * write the super block since we use a mapping of the 1263 * disk super block in a buffer. 1264 * 1265 * However, this function is still used to set the fs valid 1266 * flags to 0. We need to set this flag to 0 since the fs 1267 * may have been checked while mounted and e2fsck may have 1268 * set s_state to EXT2_VALID_FS after some corrections. 1269 */ 1270 static int ext2_sync_fs(struct super_block *sb, int wait) 1271 { 1272 struct ext2_sb_info *sbi = EXT2_SB(sb); 1273 struct ext2_super_block *es = EXT2_SB(sb)->s_es; 1274 1275 /* 1276 * Write quota structures to quota file, sync_blockdev() will write 1277 * them to disk later 1278 */ 1279 dquot_writeback_dquots(sb, -1); 1280 1281 spin_lock(&sbi->s_lock); 1282 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { 1283 ext2_debug("setting valid to 0\n"); 1284 es->s_state &= cpu_to_le16(~EXT2_VALID_FS); 1285 } 1286 spin_unlock(&sbi->s_lock); 1287 ext2_sync_super(sb, es, wait); 1288 return 0; 1289 } 1290 1291 static int ext2_freeze(struct super_block *sb) 1292 { 1293 struct ext2_sb_info *sbi = EXT2_SB(sb); 1294 1295 /* 1296 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared 1297 * because we have unattached inodes and thus filesystem is not fully 1298 * consistent. 1299 */ 1300 if (atomic_long_read(&sb->s_remove_count)) { 1301 ext2_sync_fs(sb, 1); 1302 return 0; 1303 } 1304 /* Set EXT2_FS_VALID flag */ 1305 spin_lock(&sbi->s_lock); 1306 sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state); 1307 spin_unlock(&sbi->s_lock); 1308 ext2_sync_super(sb, sbi->s_es, 1); 1309 1310 return 0; 1311 } 1312 1313 static int ext2_unfreeze(struct super_block *sb) 1314 { 1315 /* Just write sb to clear EXT2_VALID_FS flag */ 1316 ext2_write_super(sb); 1317 1318 return 0; 1319 } 1320 1321 static void ext2_write_super(struct super_block *sb) 1322 { 1323 if (!sb_rdonly(sb)) 1324 ext2_sync_fs(sb, 1); 1325 } 1326 1327 static int ext2_remount (struct super_block * sb, int * flags, char * data) 1328 { 1329 struct ext2_sb_info * sbi = EXT2_SB(sb); 1330 struct ext2_super_block * es; 1331 struct ext2_mount_options new_opts; 1332 int err; 1333 1334 sync_filesystem(sb); 1335 1336 spin_lock(&sbi->s_lock); 1337 new_opts.s_mount_opt = sbi->s_mount_opt; 1338 new_opts.s_resuid = sbi->s_resuid; 1339 new_opts.s_resgid = sbi->s_resgid; 1340 spin_unlock(&sbi->s_lock); 1341 1342 if (!parse_options(data, sb, &new_opts)) 1343 return -EINVAL; 1344 1345 spin_lock(&sbi->s_lock); 1346 es = sbi->s_es; 1347 if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) { 1348 ext2_msg(sb, KERN_WARNING, "warning: refusing change of " 1349 "dax flag with busy inodes while remounting"); 1350 new_opts.s_mount_opt ^= EXT2_MOUNT_DAX; 1351 } 1352 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) 1353 goto out_set; 1354 if (*flags & SB_RDONLY) { 1355 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || 1356 !(sbi->s_mount_state & EXT2_VALID_FS)) 1357 goto out_set; 1358 1359 /* 1360 * OK, we are remounting a valid rw partition rdonly, so set 1361 * the rdonly flag and then mark the partition as valid again. 1362 */ 1363 es->s_state = cpu_to_le16(sbi->s_mount_state); 1364 es->s_mtime = cpu_to_le32(ktime_get_real_seconds()); 1365 spin_unlock(&sbi->s_lock); 1366 1367 err = dquot_suspend(sb, -1); 1368 if (err < 0) 1369 return err; 1370 1371 ext2_sync_super(sb, es, 1); 1372 } else { 1373 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, 1374 ~EXT2_FEATURE_RO_COMPAT_SUPP); 1375 if (ret) { 1376 spin_unlock(&sbi->s_lock); 1377 ext2_msg(sb, KERN_WARNING, 1378 "warning: couldn't remount RDWR because of " 1379 "unsupported optional features (%x).", 1380 le32_to_cpu(ret)); 1381 return -EROFS; 1382 } 1383 /* 1384 * Mounting a RDONLY partition read-write, so reread and 1385 * store the current valid flag. (It may have been changed 1386 * by e2fsck since we originally mounted the partition.) 1387 */ 1388 sbi->s_mount_state = le16_to_cpu(es->s_state); 1389 if (!ext2_setup_super (sb, es, 0)) 1390 sb->s_flags &= ~SB_RDONLY; 1391 spin_unlock(&sbi->s_lock); 1392 1393 ext2_write_super(sb); 1394 1395 dquot_resume(sb, -1); 1396 } 1397 1398 spin_lock(&sbi->s_lock); 1399 out_set: 1400 sbi->s_mount_opt = new_opts.s_mount_opt; 1401 sbi->s_resuid = new_opts.s_resuid; 1402 sbi->s_resgid = new_opts.s_resgid; 1403 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | 1404 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? SB_POSIXACL : 0); 1405 spin_unlock(&sbi->s_lock); 1406 1407 return 0; 1408 } 1409 1410 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) 1411 { 1412 struct super_block *sb = dentry->d_sb; 1413 struct ext2_sb_info *sbi = EXT2_SB(sb); 1414 struct ext2_super_block *es = sbi->s_es; 1415 u64 fsid; 1416 1417 spin_lock(&sbi->s_lock); 1418 1419 if (test_opt (sb, MINIX_DF)) 1420 sbi->s_overhead_last = 0; 1421 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { 1422 unsigned long i, overhead = 0; 1423 smp_rmb(); 1424 1425 /* 1426 * Compute the overhead (FS structures). This is constant 1427 * for a given filesystem unless the number of block groups 1428 * changes so we cache the previous value until it does. 1429 */ 1430 1431 /* 1432 * All of the blocks before first_data_block are 1433 * overhead 1434 */ 1435 overhead = le32_to_cpu(es->s_first_data_block); 1436 1437 /* 1438 * Add the overhead attributed to the superblock and 1439 * block group descriptors. If the sparse superblocks 1440 * feature is turned on, then not all groups have this. 1441 */ 1442 for (i = 0; i < sbi->s_groups_count; i++) 1443 overhead += ext2_bg_has_super(sb, i) + 1444 ext2_bg_num_gdb(sb, i); 1445 1446 /* 1447 * Every block group has an inode bitmap, a block 1448 * bitmap, and an inode table. 1449 */ 1450 overhead += (sbi->s_groups_count * 1451 (2 + sbi->s_itb_per_group)); 1452 sbi->s_overhead_last = overhead; 1453 smp_wmb(); 1454 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); 1455 } 1456 1457 buf->f_type = EXT2_SUPER_MAGIC; 1458 buf->f_bsize = sb->s_blocksize; 1459 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; 1460 buf->f_bfree = ext2_count_free_blocks(sb); 1461 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); 1462 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); 1463 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) 1464 buf->f_bavail = 0; 1465 buf->f_files = le32_to_cpu(es->s_inodes_count); 1466 buf->f_ffree = ext2_count_free_inodes(sb); 1467 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); 1468 buf->f_namelen = EXT2_NAME_LEN; 1469 fsid = le64_to_cpup((void *)es->s_uuid) ^ 1470 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 1471 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 1472 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 1473 spin_unlock(&sbi->s_lock); 1474 return 0; 1475 } 1476 1477 static struct dentry *ext2_mount(struct file_system_type *fs_type, 1478 int flags, const char *dev_name, void *data) 1479 { 1480 return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super); 1481 } 1482 1483 #ifdef CONFIG_QUOTA 1484 1485 /* Read data from quotafile - avoid pagecache and such because we cannot afford 1486 * acquiring the locks... As quota files are never truncated and quota code 1487 * itself serializes the operations (and no one else should touch the files) 1488 * we don't have to be afraid of races */ 1489 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, 1490 size_t len, loff_t off) 1491 { 1492 struct inode *inode = sb_dqopt(sb)->files[type]; 1493 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1494 int err = 0; 1495 int offset = off & (sb->s_blocksize - 1); 1496 int tocopy; 1497 size_t toread; 1498 struct buffer_head tmp_bh; 1499 struct buffer_head *bh; 1500 loff_t i_size = i_size_read(inode); 1501 1502 if (off > i_size) 1503 return 0; 1504 if (off+len > i_size) 1505 len = i_size-off; 1506 toread = len; 1507 while (toread > 0) { 1508 tocopy = sb->s_blocksize - offset < toread ? 1509 sb->s_blocksize - offset : toread; 1510 1511 tmp_bh.b_state = 0; 1512 tmp_bh.b_size = sb->s_blocksize; 1513 err = ext2_get_block(inode, blk, &tmp_bh, 0); 1514 if (err < 0) 1515 return err; 1516 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 1517 memset(data, 0, tocopy); 1518 else { 1519 bh = sb_bread(sb, tmp_bh.b_blocknr); 1520 if (!bh) 1521 return -EIO; 1522 memcpy(data, bh->b_data+offset, tocopy); 1523 brelse(bh); 1524 } 1525 offset = 0; 1526 toread -= tocopy; 1527 data += tocopy; 1528 blk++; 1529 } 1530 return len; 1531 } 1532 1533 /* Write to quotafile */ 1534 static ssize_t ext2_quota_write(struct super_block *sb, int type, 1535 const char *data, size_t len, loff_t off) 1536 { 1537 struct inode *inode = sb_dqopt(sb)->files[type]; 1538 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1539 int err = 0; 1540 int offset = off & (sb->s_blocksize - 1); 1541 int tocopy; 1542 size_t towrite = len; 1543 struct buffer_head tmp_bh; 1544 struct buffer_head *bh; 1545 1546 while (towrite > 0) { 1547 tocopy = sb->s_blocksize - offset < towrite ? 1548 sb->s_blocksize - offset : towrite; 1549 1550 tmp_bh.b_state = 0; 1551 tmp_bh.b_size = sb->s_blocksize; 1552 err = ext2_get_block(inode, blk, &tmp_bh, 1); 1553 if (err < 0) 1554 goto out; 1555 if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) 1556 bh = sb_bread(sb, tmp_bh.b_blocknr); 1557 else 1558 bh = sb_getblk(sb, tmp_bh.b_blocknr); 1559 if (unlikely(!bh)) { 1560 err = -EIO; 1561 goto out; 1562 } 1563 lock_buffer(bh); 1564 memcpy(bh->b_data+offset, data, tocopy); 1565 flush_dcache_page(bh->b_page); 1566 set_buffer_uptodate(bh); 1567 mark_buffer_dirty(bh); 1568 unlock_buffer(bh); 1569 brelse(bh); 1570 offset = 0; 1571 towrite -= tocopy; 1572 data += tocopy; 1573 blk++; 1574 } 1575 out: 1576 if (len == towrite) 1577 return err; 1578 if (inode->i_size < off+len-towrite) 1579 i_size_write(inode, off+len-towrite); 1580 inode_inc_iversion(inode); 1581 inode->i_mtime = inode->i_ctime = current_time(inode); 1582 mark_inode_dirty(inode); 1583 return len - towrite; 1584 } 1585 1586 static int ext2_quota_on(struct super_block *sb, int type, int format_id, 1587 const struct path *path) 1588 { 1589 int err; 1590 struct inode *inode; 1591 1592 err = dquot_quota_on(sb, type, format_id, path); 1593 if (err) 1594 return err; 1595 1596 inode = d_inode(path->dentry); 1597 inode_lock(inode); 1598 EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL; 1599 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, 1600 S_NOATIME | S_IMMUTABLE); 1601 inode_unlock(inode); 1602 mark_inode_dirty(inode); 1603 1604 return 0; 1605 } 1606 1607 static int ext2_quota_off(struct super_block *sb, int type) 1608 { 1609 struct inode *inode = sb_dqopt(sb)->files[type]; 1610 int err; 1611 1612 if (!inode || !igrab(inode)) 1613 goto out; 1614 1615 err = dquot_quota_off(sb, type); 1616 if (err) 1617 goto out_put; 1618 1619 inode_lock(inode); 1620 EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL); 1621 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); 1622 inode_unlock(inode); 1623 mark_inode_dirty(inode); 1624 out_put: 1625 iput(inode); 1626 return err; 1627 out: 1628 return dquot_quota_off(sb, type); 1629 } 1630 1631 #endif 1632 1633 static struct file_system_type ext2_fs_type = { 1634 .owner = THIS_MODULE, 1635 .name = "ext2", 1636 .mount = ext2_mount, 1637 .kill_sb = kill_block_super, 1638 .fs_flags = FS_REQUIRES_DEV, 1639 }; 1640 MODULE_ALIAS_FS("ext2"); 1641 1642 static int __init init_ext2_fs(void) 1643 { 1644 int err; 1645 1646 err = init_inodecache(); 1647 if (err) 1648 return err; 1649 err = register_filesystem(&ext2_fs_type); 1650 if (err) 1651 goto out; 1652 return 0; 1653 out: 1654 destroy_inodecache(); 1655 return err; 1656 } 1657 1658 static void __exit exit_ext2_fs(void) 1659 { 1660 unregister_filesystem(&ext2_fs_type); 1661 destroy_inodecache(); 1662 } 1663 1664 MODULE_AUTHOR("Remy Card and others"); 1665 MODULE_DESCRIPTION("Second Extended Filesystem"); 1666 MODULE_LICENSE("GPL"); 1667 module_init(init_ext2_fs) 1668 module_exit(exit_ext2_fs) 1669