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) <= get_seconds())) 686 ext2_msg(sb, KERN_WARNING, 687 "warning: checktime reached, " 688 "running e2fsck is recommended"); 689 if (!le16_to_cpu(es->s_max_mnt_count)) 690 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); 691 le16_add_cpu(&es->s_mnt_count, 1); 692 if (test_opt (sb, DEBUG)) 693 ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, " 694 "bpg=%lu, ipg=%lu, mo=%04lx]", 695 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, 696 sbi->s_frag_size, 697 sbi->s_groups_count, 698 EXT2_BLOCKS_PER_GROUP(sb), 699 EXT2_INODES_PER_GROUP(sb), 700 sbi->s_mount_opt); 701 return res; 702 } 703 704 static int ext2_check_descriptors(struct super_block *sb) 705 { 706 int i; 707 struct ext2_sb_info *sbi = EXT2_SB(sb); 708 709 ext2_debug ("Checking group descriptors"); 710 711 for (i = 0; i < sbi->s_groups_count; i++) { 712 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL); 713 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i); 714 ext2_fsblk_t last_block; 715 716 if (i == sbi->s_groups_count - 1) 717 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; 718 else 719 last_block = first_block + 720 (EXT2_BLOCKS_PER_GROUP(sb) - 1); 721 722 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || 723 le32_to_cpu(gdp->bg_block_bitmap) > last_block) 724 { 725 ext2_error (sb, "ext2_check_descriptors", 726 "Block bitmap for group %d" 727 " not in group (block %lu)!", 728 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); 729 return 0; 730 } 731 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || 732 le32_to_cpu(gdp->bg_inode_bitmap) > last_block) 733 { 734 ext2_error (sb, "ext2_check_descriptors", 735 "Inode bitmap for group %d" 736 " not in group (block %lu)!", 737 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); 738 return 0; 739 } 740 if (le32_to_cpu(gdp->bg_inode_table) < first_block || 741 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > 742 last_block) 743 { 744 ext2_error (sb, "ext2_check_descriptors", 745 "Inode table for group %d" 746 " not in group (block %lu)!", 747 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); 748 return 0; 749 } 750 } 751 return 1; 752 } 753 754 /* 755 * Maximal file size. There is a direct, and {,double-,triple-}indirect 756 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. 757 * We need to be 1 filesystem block less than the 2^32 sector limit. 758 */ 759 static loff_t ext2_max_size(int bits) 760 { 761 loff_t res = EXT2_NDIR_BLOCKS; 762 int meta_blocks; 763 loff_t upper_limit; 764 765 /* This is calculated to be the largest file size for a 766 * dense, file such that the total number of 767 * sectors in the file, including data and all indirect blocks, 768 * does not exceed 2^32 -1 769 * __u32 i_blocks representing the total number of 770 * 512 bytes blocks of the file 771 */ 772 upper_limit = (1LL << 32) - 1; 773 774 /* total blocks in file system block size */ 775 upper_limit >>= (bits - 9); 776 777 778 /* indirect blocks */ 779 meta_blocks = 1; 780 /* double indirect blocks */ 781 meta_blocks += 1 + (1LL << (bits-2)); 782 /* tripple indirect blocks */ 783 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); 784 785 upper_limit -= meta_blocks; 786 upper_limit <<= bits; 787 788 res += 1LL << (bits-2); 789 res += 1LL << (2*(bits-2)); 790 res += 1LL << (3*(bits-2)); 791 res <<= bits; 792 if (res > upper_limit) 793 res = upper_limit; 794 795 if (res > MAX_LFS_FILESIZE) 796 res = MAX_LFS_FILESIZE; 797 798 return res; 799 } 800 801 static unsigned long descriptor_loc(struct super_block *sb, 802 unsigned long logic_sb_block, 803 int nr) 804 { 805 struct ext2_sb_info *sbi = EXT2_SB(sb); 806 unsigned long bg, first_meta_bg; 807 int has_super = 0; 808 809 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 810 811 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || 812 nr < first_meta_bg) 813 return (logic_sb_block + nr + 1); 814 bg = sbi->s_desc_per_block * nr; 815 if (ext2_bg_has_super(sb, bg)) 816 has_super = 1; 817 818 return ext2_group_first_block_no(sb, bg) + has_super; 819 } 820 821 static int ext2_fill_super(struct super_block *sb, void *data, int silent) 822 { 823 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev); 824 struct buffer_head * bh; 825 struct ext2_sb_info * sbi; 826 struct ext2_super_block * es; 827 struct inode *root; 828 unsigned long block; 829 unsigned long sb_block = get_sb_block(&data); 830 unsigned long logic_sb_block; 831 unsigned long offset = 0; 832 unsigned long def_mount_opts; 833 long ret = -ENOMEM; 834 int blocksize = BLOCK_SIZE; 835 int db_count; 836 int i, j; 837 __le32 features; 838 int err; 839 struct ext2_mount_options opts; 840 841 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 842 if (!sbi) 843 goto failed; 844 845 sbi->s_blockgroup_lock = 846 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); 847 if (!sbi->s_blockgroup_lock) { 848 kfree(sbi); 849 goto failed; 850 } 851 sb->s_fs_info = sbi; 852 sbi->s_sb_block = sb_block; 853 sbi->s_daxdev = dax_dev; 854 855 spin_lock_init(&sbi->s_lock); 856 ret = -EINVAL; 857 858 /* 859 * See what the current blocksize for the device is, and 860 * use that as the blocksize. Otherwise (or if the blocksize 861 * is smaller than the default) use the default. 862 * This is important for devices that have a hardware 863 * sectorsize that is larger than the default. 864 */ 865 blocksize = sb_min_blocksize(sb, BLOCK_SIZE); 866 if (!blocksize) { 867 ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); 868 goto failed_sbi; 869 } 870 871 /* 872 * If the superblock doesn't start on a hardware sector boundary, 873 * calculate the offset. 874 */ 875 if (blocksize != BLOCK_SIZE) { 876 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 877 offset = (sb_block*BLOCK_SIZE) % blocksize; 878 } else { 879 logic_sb_block = sb_block; 880 } 881 882 if (!(bh = sb_bread(sb, logic_sb_block))) { 883 ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); 884 goto failed_sbi; 885 } 886 /* 887 * Note: s_es must be initialized as soon as possible because 888 * some ext2 macro-instructions depend on its value 889 */ 890 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 891 sbi->s_es = es; 892 sb->s_magic = le16_to_cpu(es->s_magic); 893 894 if (sb->s_magic != EXT2_SUPER_MAGIC) 895 goto cantfind_ext2; 896 897 /* Set defaults before we parse the mount options */ 898 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 899 if (def_mount_opts & EXT2_DEFM_DEBUG) 900 set_opt(opts.s_mount_opt, DEBUG); 901 if (def_mount_opts & EXT2_DEFM_BSDGROUPS) 902 set_opt(opts.s_mount_opt, GRPID); 903 if (def_mount_opts & EXT2_DEFM_UID16) 904 set_opt(opts.s_mount_opt, NO_UID32); 905 #ifdef CONFIG_EXT2_FS_XATTR 906 if (def_mount_opts & EXT2_DEFM_XATTR_USER) 907 set_opt(opts.s_mount_opt, XATTR_USER); 908 #endif 909 #ifdef CONFIG_EXT2_FS_POSIX_ACL 910 if (def_mount_opts & EXT2_DEFM_ACL) 911 set_opt(opts.s_mount_opt, POSIX_ACL); 912 #endif 913 914 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) 915 set_opt(opts.s_mount_opt, ERRORS_PANIC); 916 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) 917 set_opt(opts.s_mount_opt, ERRORS_CONT); 918 else 919 set_opt(opts.s_mount_opt, ERRORS_RO); 920 921 opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); 922 opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); 923 924 set_opt(opts.s_mount_opt, RESERVATION); 925 926 if (!parse_options((char *) data, sb, &opts)) 927 goto failed_mount; 928 929 sbi->s_mount_opt = opts.s_mount_opt; 930 sbi->s_resuid = opts.s_resuid; 931 sbi->s_resgid = opts.s_resgid; 932 933 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | 934 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? 935 SB_POSIXACL : 0); 936 sb->s_iflags |= SB_I_CGROUPWB; 937 938 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && 939 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || 940 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 941 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) 942 ext2_msg(sb, KERN_WARNING, 943 "warning: feature flags set on rev 0 fs, " 944 "running e2fsck is recommended"); 945 /* 946 * Check feature flags regardless of the revision level, since we 947 * previously didn't change the revision level when setting the flags, 948 * so there is a chance incompat flags are set on a rev 0 filesystem. 949 */ 950 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); 951 if (features) { 952 ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " 953 "unsupported optional features (%x)", 954 le32_to_cpu(features)); 955 goto failed_mount; 956 } 957 if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ 958 ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " 959 "unsupported optional features (%x)", 960 le32_to_cpu(features)); 961 goto failed_mount; 962 } 963 964 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); 965 966 if (sbi->s_mount_opt & EXT2_MOUNT_DAX) { 967 if (!bdev_dax_supported(sb->s_bdev, blocksize)) { 968 ext2_msg(sb, KERN_ERR, 969 "DAX unsupported by block device. Turning off DAX."); 970 sbi->s_mount_opt &= ~EXT2_MOUNT_DAX; 971 } 972 } 973 974 /* If the blocksize doesn't match, re-read the thing.. */ 975 if (sb->s_blocksize != blocksize) { 976 brelse(bh); 977 978 if (!sb_set_blocksize(sb, blocksize)) { 979 ext2_msg(sb, KERN_ERR, 980 "error: bad blocksize %d", blocksize); 981 goto failed_sbi; 982 } 983 984 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 985 offset = (sb_block*BLOCK_SIZE) % blocksize; 986 bh = sb_bread(sb, logic_sb_block); 987 if(!bh) { 988 ext2_msg(sb, KERN_ERR, "error: couldn't read" 989 "superblock on 2nd try"); 990 goto failed_sbi; 991 } 992 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 993 sbi->s_es = es; 994 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { 995 ext2_msg(sb, KERN_ERR, "error: magic mismatch"); 996 goto failed_mount; 997 } 998 } 999 1000 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); 1001 sb->s_max_links = EXT2_LINK_MAX; 1002 1003 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { 1004 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; 1005 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; 1006 } else { 1007 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 1008 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 1009 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || 1010 !is_power_of_2(sbi->s_inode_size) || 1011 (sbi->s_inode_size > blocksize)) { 1012 ext2_msg(sb, KERN_ERR, 1013 "error: unsupported inode size: %d", 1014 sbi->s_inode_size); 1015 goto failed_mount; 1016 } 1017 } 1018 1019 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << 1020 le32_to_cpu(es->s_log_frag_size); 1021 if (sbi->s_frag_size == 0) 1022 goto cantfind_ext2; 1023 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; 1024 1025 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 1026 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); 1027 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 1028 1029 if (EXT2_INODE_SIZE(sb) == 0) 1030 goto cantfind_ext2; 1031 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); 1032 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) 1033 goto cantfind_ext2; 1034 sbi->s_itb_per_group = sbi->s_inodes_per_group / 1035 sbi->s_inodes_per_block; 1036 sbi->s_desc_per_block = sb->s_blocksize / 1037 sizeof (struct ext2_group_desc); 1038 sbi->s_sbh = bh; 1039 sbi->s_mount_state = le16_to_cpu(es->s_state); 1040 sbi->s_addr_per_block_bits = 1041 ilog2 (EXT2_ADDR_PER_BLOCK(sb)); 1042 sbi->s_desc_per_block_bits = 1043 ilog2 (EXT2_DESC_PER_BLOCK(sb)); 1044 1045 if (sb->s_magic != EXT2_SUPER_MAGIC) 1046 goto cantfind_ext2; 1047 1048 if (sb->s_blocksize != bh->b_size) { 1049 if (!silent) 1050 ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); 1051 goto failed_mount; 1052 } 1053 1054 if (sb->s_blocksize != sbi->s_frag_size) { 1055 ext2_msg(sb, KERN_ERR, 1056 "error: fragsize %lu != blocksize %lu" 1057 "(not supported yet)", 1058 sbi->s_frag_size, sb->s_blocksize); 1059 goto failed_mount; 1060 } 1061 1062 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { 1063 ext2_msg(sb, KERN_ERR, 1064 "error: #blocks per group too big: %lu", 1065 sbi->s_blocks_per_group); 1066 goto failed_mount; 1067 } 1068 if (sbi->s_frags_per_group > sb->s_blocksize * 8) { 1069 ext2_msg(sb, KERN_ERR, 1070 "error: #fragments per group too big: %lu", 1071 sbi->s_frags_per_group); 1072 goto failed_mount; 1073 } 1074 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { 1075 ext2_msg(sb, KERN_ERR, 1076 "error: #inodes per group too big: %lu", 1077 sbi->s_inodes_per_group); 1078 goto failed_mount; 1079 } 1080 1081 if (EXT2_BLOCKS_PER_GROUP(sb) == 0) 1082 goto cantfind_ext2; 1083 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - 1084 le32_to_cpu(es->s_first_data_block) - 1) 1085 / EXT2_BLOCKS_PER_GROUP(sb)) + 1; 1086 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / 1087 EXT2_DESC_PER_BLOCK(sb); 1088 sbi->s_group_desc = kmalloc_array (db_count, 1089 sizeof(struct buffer_head *), 1090 GFP_KERNEL); 1091 if (sbi->s_group_desc == NULL) { 1092 ext2_msg(sb, KERN_ERR, "error: not enough memory"); 1093 goto failed_mount; 1094 } 1095 bgl_lock_init(sbi->s_blockgroup_lock); 1096 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); 1097 if (!sbi->s_debts) { 1098 ext2_msg(sb, KERN_ERR, "error: not enough memory"); 1099 goto failed_mount_group_desc; 1100 } 1101 for (i = 0; i < db_count; i++) { 1102 block = descriptor_loc(sb, logic_sb_block, i); 1103 sbi->s_group_desc[i] = sb_bread(sb, block); 1104 if (!sbi->s_group_desc[i]) { 1105 for (j = 0; j < i; j++) 1106 brelse (sbi->s_group_desc[j]); 1107 ext2_msg(sb, KERN_ERR, 1108 "error: unable to read group descriptors"); 1109 goto failed_mount_group_desc; 1110 } 1111 } 1112 if (!ext2_check_descriptors (sb)) { 1113 ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); 1114 goto failed_mount2; 1115 } 1116 sbi->s_gdb_count = db_count; 1117 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 1118 spin_lock_init(&sbi->s_next_gen_lock); 1119 1120 /* per fileystem reservation list head & lock */ 1121 spin_lock_init(&sbi->s_rsv_window_lock); 1122 sbi->s_rsv_window_root = RB_ROOT; 1123 /* 1124 * Add a single, static dummy reservation to the start of the 1125 * reservation window list --- it gives us a placeholder for 1126 * append-at-start-of-list which makes the allocation logic 1127 * _much_ simpler. 1128 */ 1129 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; 1130 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; 1131 sbi->s_rsv_window_head.rsv_alloc_hit = 0; 1132 sbi->s_rsv_window_head.rsv_goal_size = 0; 1133 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); 1134 1135 err = percpu_counter_init(&sbi->s_freeblocks_counter, 1136 ext2_count_free_blocks(sb), GFP_KERNEL); 1137 if (!err) { 1138 err = percpu_counter_init(&sbi->s_freeinodes_counter, 1139 ext2_count_free_inodes(sb), GFP_KERNEL); 1140 } 1141 if (!err) { 1142 err = percpu_counter_init(&sbi->s_dirs_counter, 1143 ext2_count_dirs(sb), GFP_KERNEL); 1144 } 1145 if (err) { 1146 ext2_msg(sb, KERN_ERR, "error: insufficient memory"); 1147 goto failed_mount3; 1148 } 1149 1150 #ifdef CONFIG_EXT2_FS_XATTR 1151 sbi->s_ea_block_cache = ext2_xattr_create_cache(); 1152 if (!sbi->s_ea_block_cache) { 1153 ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache"); 1154 goto failed_mount3; 1155 } 1156 #endif 1157 /* 1158 * set up enough so that it can read an inode 1159 */ 1160 sb->s_op = &ext2_sops; 1161 sb->s_export_op = &ext2_export_ops; 1162 sb->s_xattr = ext2_xattr_handlers; 1163 1164 #ifdef CONFIG_QUOTA 1165 sb->dq_op = &dquot_operations; 1166 sb->s_qcop = &ext2_quotactl_ops; 1167 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1168 #endif 1169 1170 root = ext2_iget(sb, EXT2_ROOT_INO); 1171 if (IS_ERR(root)) { 1172 ret = PTR_ERR(root); 1173 goto failed_mount3; 1174 } 1175 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 1176 iput(root); 1177 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); 1178 goto failed_mount3; 1179 } 1180 1181 sb->s_root = d_make_root(root); 1182 if (!sb->s_root) { 1183 ext2_msg(sb, KERN_ERR, "error: get root inode failed"); 1184 ret = -ENOMEM; 1185 goto failed_mount3; 1186 } 1187 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 1188 ext2_msg(sb, KERN_WARNING, 1189 "warning: mounting ext3 filesystem as ext2"); 1190 if (ext2_setup_super (sb, es, sb_rdonly(sb))) 1191 sb->s_flags |= SB_RDONLY; 1192 ext2_write_super(sb); 1193 return 0; 1194 1195 cantfind_ext2: 1196 if (!silent) 1197 ext2_msg(sb, KERN_ERR, 1198 "error: can't find an ext2 filesystem on dev %s.", 1199 sb->s_id); 1200 goto failed_mount; 1201 failed_mount3: 1202 if (sbi->s_ea_block_cache) 1203 ext2_xattr_destroy_cache(sbi->s_ea_block_cache); 1204 percpu_counter_destroy(&sbi->s_freeblocks_counter); 1205 percpu_counter_destroy(&sbi->s_freeinodes_counter); 1206 percpu_counter_destroy(&sbi->s_dirs_counter); 1207 failed_mount2: 1208 for (i = 0; i < db_count; i++) 1209 brelse(sbi->s_group_desc[i]); 1210 failed_mount_group_desc: 1211 kfree(sbi->s_group_desc); 1212 kfree(sbi->s_debts); 1213 failed_mount: 1214 brelse(bh); 1215 failed_sbi: 1216 sb->s_fs_info = NULL; 1217 kfree(sbi->s_blockgroup_lock); 1218 kfree(sbi); 1219 failed: 1220 fs_put_dax(dax_dev); 1221 return ret; 1222 } 1223 1224 static void ext2_clear_super_error(struct super_block *sb) 1225 { 1226 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; 1227 1228 if (buffer_write_io_error(sbh)) { 1229 /* 1230 * Oh, dear. A previous attempt to write the 1231 * superblock failed. This could happen because the 1232 * USB device was yanked out. Or it could happen to 1233 * be a transient write error and maybe the block will 1234 * be remapped. Nothing we can do but to retry the 1235 * write and hope for the best. 1236 */ 1237 ext2_msg(sb, KERN_ERR, 1238 "previous I/O error to superblock detected"); 1239 clear_buffer_write_io_error(sbh); 1240 set_buffer_uptodate(sbh); 1241 } 1242 } 1243 1244 void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, 1245 int wait) 1246 { 1247 ext2_clear_super_error(sb); 1248 spin_lock(&EXT2_SB(sb)->s_lock); 1249 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); 1250 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); 1251 es->s_wtime = cpu_to_le32(get_seconds()); 1252 /* unlock before we do IO */ 1253 spin_unlock(&EXT2_SB(sb)->s_lock); 1254 mark_buffer_dirty(EXT2_SB(sb)->s_sbh); 1255 if (wait) 1256 sync_dirty_buffer(EXT2_SB(sb)->s_sbh); 1257 } 1258 1259 /* 1260 * In the second extended file system, it is not necessary to 1261 * write the super block since we use a mapping of the 1262 * disk super block in a buffer. 1263 * 1264 * However, this function is still used to set the fs valid 1265 * flags to 0. We need to set this flag to 0 since the fs 1266 * may have been checked while mounted and e2fsck may have 1267 * set s_state to EXT2_VALID_FS after some corrections. 1268 */ 1269 static int ext2_sync_fs(struct super_block *sb, int wait) 1270 { 1271 struct ext2_sb_info *sbi = EXT2_SB(sb); 1272 struct ext2_super_block *es = EXT2_SB(sb)->s_es; 1273 1274 /* 1275 * Write quota structures to quota file, sync_blockdev() will write 1276 * them to disk later 1277 */ 1278 dquot_writeback_dquots(sb, -1); 1279 1280 spin_lock(&sbi->s_lock); 1281 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { 1282 ext2_debug("setting valid to 0\n"); 1283 es->s_state &= cpu_to_le16(~EXT2_VALID_FS); 1284 } 1285 spin_unlock(&sbi->s_lock); 1286 ext2_sync_super(sb, es, wait); 1287 return 0; 1288 } 1289 1290 static int ext2_freeze(struct super_block *sb) 1291 { 1292 struct ext2_sb_info *sbi = EXT2_SB(sb); 1293 1294 /* 1295 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared 1296 * because we have unattached inodes and thus filesystem is not fully 1297 * consistent. 1298 */ 1299 if (atomic_long_read(&sb->s_remove_count)) { 1300 ext2_sync_fs(sb, 1); 1301 return 0; 1302 } 1303 /* Set EXT2_FS_VALID flag */ 1304 spin_lock(&sbi->s_lock); 1305 sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state); 1306 spin_unlock(&sbi->s_lock); 1307 ext2_sync_super(sb, sbi->s_es, 1); 1308 1309 return 0; 1310 } 1311 1312 static int ext2_unfreeze(struct super_block *sb) 1313 { 1314 /* Just write sb to clear EXT2_VALID_FS flag */ 1315 ext2_write_super(sb); 1316 1317 return 0; 1318 } 1319 1320 static void ext2_write_super(struct super_block *sb) 1321 { 1322 if (!sb_rdonly(sb)) 1323 ext2_sync_fs(sb, 1); 1324 } 1325 1326 static int ext2_remount (struct super_block * sb, int * flags, char * data) 1327 { 1328 struct ext2_sb_info * sbi = EXT2_SB(sb); 1329 struct ext2_super_block * es; 1330 struct ext2_mount_options new_opts; 1331 int err; 1332 1333 sync_filesystem(sb); 1334 1335 spin_lock(&sbi->s_lock); 1336 new_opts.s_mount_opt = sbi->s_mount_opt; 1337 new_opts.s_resuid = sbi->s_resuid; 1338 new_opts.s_resgid = sbi->s_resgid; 1339 spin_unlock(&sbi->s_lock); 1340 1341 if (!parse_options(data, sb, &new_opts)) 1342 return -EINVAL; 1343 1344 spin_lock(&sbi->s_lock); 1345 es = sbi->s_es; 1346 if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) { 1347 ext2_msg(sb, KERN_WARNING, "warning: refusing change of " 1348 "dax flag with busy inodes while remounting"); 1349 new_opts.s_mount_opt ^= EXT2_MOUNT_DAX; 1350 } 1351 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) 1352 goto out_set; 1353 if (*flags & SB_RDONLY) { 1354 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || 1355 !(sbi->s_mount_state & EXT2_VALID_FS)) 1356 goto out_set; 1357 1358 /* 1359 * OK, we are remounting a valid rw partition rdonly, so set 1360 * the rdonly flag and then mark the partition as valid again. 1361 */ 1362 es->s_state = cpu_to_le16(sbi->s_mount_state); 1363 es->s_mtime = cpu_to_le32(get_seconds()); 1364 spin_unlock(&sbi->s_lock); 1365 1366 err = dquot_suspend(sb, -1); 1367 if (err < 0) 1368 return err; 1369 1370 ext2_sync_super(sb, es, 1); 1371 } else { 1372 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, 1373 ~EXT2_FEATURE_RO_COMPAT_SUPP); 1374 if (ret) { 1375 spin_unlock(&sbi->s_lock); 1376 ext2_msg(sb, KERN_WARNING, 1377 "warning: couldn't remount RDWR because of " 1378 "unsupported optional features (%x).", 1379 le32_to_cpu(ret)); 1380 return -EROFS; 1381 } 1382 /* 1383 * Mounting a RDONLY partition read-write, so reread and 1384 * store the current valid flag. (It may have been changed 1385 * by e2fsck since we originally mounted the partition.) 1386 */ 1387 sbi->s_mount_state = le16_to_cpu(es->s_state); 1388 if (!ext2_setup_super (sb, es, 0)) 1389 sb->s_flags &= ~SB_RDONLY; 1390 spin_unlock(&sbi->s_lock); 1391 1392 ext2_write_super(sb); 1393 1394 dquot_resume(sb, -1); 1395 } 1396 1397 spin_lock(&sbi->s_lock); 1398 out_set: 1399 sbi->s_mount_opt = new_opts.s_mount_opt; 1400 sbi->s_resuid = new_opts.s_resuid; 1401 sbi->s_resgid = new_opts.s_resgid; 1402 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | 1403 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? SB_POSIXACL : 0); 1404 spin_unlock(&sbi->s_lock); 1405 1406 return 0; 1407 } 1408 1409 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) 1410 { 1411 struct super_block *sb = dentry->d_sb; 1412 struct ext2_sb_info *sbi = EXT2_SB(sb); 1413 struct ext2_super_block *es = sbi->s_es; 1414 u64 fsid; 1415 1416 spin_lock(&sbi->s_lock); 1417 1418 if (test_opt (sb, MINIX_DF)) 1419 sbi->s_overhead_last = 0; 1420 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { 1421 unsigned long i, overhead = 0; 1422 smp_rmb(); 1423 1424 /* 1425 * Compute the overhead (FS structures). This is constant 1426 * for a given filesystem unless the number of block groups 1427 * changes so we cache the previous value until it does. 1428 */ 1429 1430 /* 1431 * All of the blocks before first_data_block are 1432 * overhead 1433 */ 1434 overhead = le32_to_cpu(es->s_first_data_block); 1435 1436 /* 1437 * Add the overhead attributed to the superblock and 1438 * block group descriptors. If the sparse superblocks 1439 * feature is turned on, then not all groups have this. 1440 */ 1441 for (i = 0; i < sbi->s_groups_count; i++) 1442 overhead += ext2_bg_has_super(sb, i) + 1443 ext2_bg_num_gdb(sb, i); 1444 1445 /* 1446 * Every block group has an inode bitmap, a block 1447 * bitmap, and an inode table. 1448 */ 1449 overhead += (sbi->s_groups_count * 1450 (2 + sbi->s_itb_per_group)); 1451 sbi->s_overhead_last = overhead; 1452 smp_wmb(); 1453 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); 1454 } 1455 1456 buf->f_type = EXT2_SUPER_MAGIC; 1457 buf->f_bsize = sb->s_blocksize; 1458 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; 1459 buf->f_bfree = ext2_count_free_blocks(sb); 1460 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); 1461 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); 1462 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) 1463 buf->f_bavail = 0; 1464 buf->f_files = le32_to_cpu(es->s_inodes_count); 1465 buf->f_ffree = ext2_count_free_inodes(sb); 1466 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); 1467 buf->f_namelen = EXT2_NAME_LEN; 1468 fsid = le64_to_cpup((void *)es->s_uuid) ^ 1469 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 1470 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 1471 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 1472 spin_unlock(&sbi->s_lock); 1473 return 0; 1474 } 1475 1476 static struct dentry *ext2_mount(struct file_system_type *fs_type, 1477 int flags, const char *dev_name, void *data) 1478 { 1479 return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super); 1480 } 1481 1482 #ifdef CONFIG_QUOTA 1483 1484 /* Read data from quotafile - avoid pagecache and such because we cannot afford 1485 * acquiring the locks... As quota files are never truncated and quota code 1486 * itself serializes the operations (and no one else should touch the files) 1487 * we don't have to be afraid of races */ 1488 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, 1489 size_t len, loff_t off) 1490 { 1491 struct inode *inode = sb_dqopt(sb)->files[type]; 1492 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1493 int err = 0; 1494 int offset = off & (sb->s_blocksize - 1); 1495 int tocopy; 1496 size_t toread; 1497 struct buffer_head tmp_bh; 1498 struct buffer_head *bh; 1499 loff_t i_size = i_size_read(inode); 1500 1501 if (off > i_size) 1502 return 0; 1503 if (off+len > i_size) 1504 len = i_size-off; 1505 toread = len; 1506 while (toread > 0) { 1507 tocopy = sb->s_blocksize - offset < toread ? 1508 sb->s_blocksize - offset : toread; 1509 1510 tmp_bh.b_state = 0; 1511 tmp_bh.b_size = sb->s_blocksize; 1512 err = ext2_get_block(inode, blk, &tmp_bh, 0); 1513 if (err < 0) 1514 return err; 1515 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 1516 memset(data, 0, tocopy); 1517 else { 1518 bh = sb_bread(sb, tmp_bh.b_blocknr); 1519 if (!bh) 1520 return -EIO; 1521 memcpy(data, bh->b_data+offset, tocopy); 1522 brelse(bh); 1523 } 1524 offset = 0; 1525 toread -= tocopy; 1526 data += tocopy; 1527 blk++; 1528 } 1529 return len; 1530 } 1531 1532 /* Write to quotafile */ 1533 static ssize_t ext2_quota_write(struct super_block *sb, int type, 1534 const char *data, size_t len, loff_t off) 1535 { 1536 struct inode *inode = sb_dqopt(sb)->files[type]; 1537 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1538 int err = 0; 1539 int offset = off & (sb->s_blocksize - 1); 1540 int tocopy; 1541 size_t towrite = len; 1542 struct buffer_head tmp_bh; 1543 struct buffer_head *bh; 1544 1545 while (towrite > 0) { 1546 tocopy = sb->s_blocksize - offset < towrite ? 1547 sb->s_blocksize - offset : towrite; 1548 1549 tmp_bh.b_state = 0; 1550 tmp_bh.b_size = sb->s_blocksize; 1551 err = ext2_get_block(inode, blk, &tmp_bh, 1); 1552 if (err < 0) 1553 goto out; 1554 if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) 1555 bh = sb_bread(sb, tmp_bh.b_blocknr); 1556 else 1557 bh = sb_getblk(sb, tmp_bh.b_blocknr); 1558 if (unlikely(!bh)) { 1559 err = -EIO; 1560 goto out; 1561 } 1562 lock_buffer(bh); 1563 memcpy(bh->b_data+offset, data, tocopy); 1564 flush_dcache_page(bh->b_page); 1565 set_buffer_uptodate(bh); 1566 mark_buffer_dirty(bh); 1567 unlock_buffer(bh); 1568 brelse(bh); 1569 offset = 0; 1570 towrite -= tocopy; 1571 data += tocopy; 1572 blk++; 1573 } 1574 out: 1575 if (len == towrite) 1576 return err; 1577 if (inode->i_size < off+len-towrite) 1578 i_size_write(inode, off+len-towrite); 1579 inode_inc_iversion(inode); 1580 inode->i_mtime = inode->i_ctime = current_time(inode); 1581 mark_inode_dirty(inode); 1582 return len - towrite; 1583 } 1584 1585 static int ext2_quota_on(struct super_block *sb, int type, int format_id, 1586 const struct path *path) 1587 { 1588 int err; 1589 struct inode *inode; 1590 1591 err = dquot_quota_on(sb, type, format_id, path); 1592 if (err) 1593 return err; 1594 1595 inode = d_inode(path->dentry); 1596 inode_lock(inode); 1597 EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL; 1598 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, 1599 S_NOATIME | S_IMMUTABLE); 1600 inode_unlock(inode); 1601 mark_inode_dirty(inode); 1602 1603 return 0; 1604 } 1605 1606 static int ext2_quota_off(struct super_block *sb, int type) 1607 { 1608 struct inode *inode = sb_dqopt(sb)->files[type]; 1609 int err; 1610 1611 if (!inode || !igrab(inode)) 1612 goto out; 1613 1614 err = dquot_quota_off(sb, type); 1615 if (err) 1616 goto out_put; 1617 1618 inode_lock(inode); 1619 EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL); 1620 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); 1621 inode_unlock(inode); 1622 mark_inode_dirty(inode); 1623 out_put: 1624 iput(inode); 1625 return err; 1626 out: 1627 return dquot_quota_off(sb, type); 1628 } 1629 1630 #endif 1631 1632 static struct file_system_type ext2_fs_type = { 1633 .owner = THIS_MODULE, 1634 .name = "ext2", 1635 .mount = ext2_mount, 1636 .kill_sb = kill_block_super, 1637 .fs_flags = FS_REQUIRES_DEV, 1638 }; 1639 MODULE_ALIAS_FS("ext2"); 1640 1641 static int __init init_ext2_fs(void) 1642 { 1643 int err; 1644 1645 err = init_inodecache(); 1646 if (err) 1647 return err; 1648 err = register_filesystem(&ext2_fs_type); 1649 if (err) 1650 goto out; 1651 return 0; 1652 out: 1653 destroy_inodecache(); 1654 return err; 1655 } 1656 1657 static void __exit exit_ext2_fs(void) 1658 { 1659 unregister_filesystem(&ext2_fs_type); 1660 destroy_inodecache(); 1661 } 1662 1663 MODULE_AUTHOR("Remy Card and others"); 1664 MODULE_DESCRIPTION("Second Extended Filesystem"); 1665 MODULE_LICENSE("GPL"); 1666 module_init(init_ext2_fs) 1667 module_exit(exit_ext2_fs) 1668