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 clear_opt (opts->s_mount_opt, CHECK); 561 break; 562 case Opt_debug: 563 set_opt (opts->s_mount_opt, DEBUG); 564 break; 565 case Opt_oldalloc: 566 set_opt (opts->s_mount_opt, OLDALLOC); 567 break; 568 case Opt_orlov: 569 clear_opt (opts->s_mount_opt, OLDALLOC); 570 break; 571 case Opt_nobh: 572 set_opt (opts->s_mount_opt, NOBH); 573 break; 574 #ifdef CONFIG_EXT2_FS_XATTR 575 case Opt_user_xattr: 576 set_opt (opts->s_mount_opt, XATTR_USER); 577 break; 578 case Opt_nouser_xattr: 579 clear_opt (opts->s_mount_opt, XATTR_USER); 580 break; 581 #else 582 case Opt_user_xattr: 583 case Opt_nouser_xattr: 584 ext2_msg(sb, KERN_INFO, "(no)user_xattr options" 585 "not supported"); 586 break; 587 #endif 588 #ifdef CONFIG_EXT2_FS_POSIX_ACL 589 case Opt_acl: 590 set_opt(opts->s_mount_opt, POSIX_ACL); 591 break; 592 case Opt_noacl: 593 clear_opt(opts->s_mount_opt, POSIX_ACL); 594 break; 595 #else 596 case Opt_acl: 597 case Opt_noacl: 598 ext2_msg(sb, KERN_INFO, 599 "(no)acl options not supported"); 600 break; 601 #endif 602 case Opt_xip: 603 ext2_msg(sb, KERN_INFO, "use dax instead of xip"); 604 set_opt(opts->s_mount_opt, XIP); 605 /* Fall through */ 606 case Opt_dax: 607 #ifdef CONFIG_FS_DAX 608 ext2_msg(sb, KERN_WARNING, 609 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); 610 set_opt(opts->s_mount_opt, DAX); 611 #else 612 ext2_msg(sb, KERN_INFO, "dax option not supported"); 613 #endif 614 break; 615 616 #if defined(CONFIG_QUOTA) 617 case Opt_quota: 618 case Opt_usrquota: 619 set_opt(opts->s_mount_opt, USRQUOTA); 620 break; 621 622 case Opt_grpquota: 623 set_opt(opts->s_mount_opt, GRPQUOTA); 624 break; 625 #else 626 case Opt_quota: 627 case Opt_usrquota: 628 case Opt_grpquota: 629 ext2_msg(sb, KERN_INFO, 630 "quota operations not supported"); 631 break; 632 #endif 633 634 case Opt_reservation: 635 set_opt(opts->s_mount_opt, RESERVATION); 636 ext2_msg(sb, KERN_INFO, "reservations ON"); 637 break; 638 case Opt_noreservation: 639 clear_opt(opts->s_mount_opt, RESERVATION); 640 ext2_msg(sb, KERN_INFO, "reservations OFF"); 641 break; 642 case Opt_ignore: 643 break; 644 default: 645 return 0; 646 } 647 } 648 return 1; 649 } 650 651 static int ext2_setup_super (struct super_block * sb, 652 struct ext2_super_block * es, 653 int read_only) 654 { 655 int res = 0; 656 struct ext2_sb_info *sbi = EXT2_SB(sb); 657 658 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { 659 ext2_msg(sb, KERN_ERR, 660 "error: revision level too high, " 661 "forcing read-only mode"); 662 res = SB_RDONLY; 663 } 664 if (read_only) 665 return res; 666 if (!(sbi->s_mount_state & EXT2_VALID_FS)) 667 ext2_msg(sb, KERN_WARNING, 668 "warning: mounting unchecked fs, " 669 "running e2fsck is recommended"); 670 else if ((sbi->s_mount_state & EXT2_ERROR_FS)) 671 ext2_msg(sb, KERN_WARNING, 672 "warning: mounting fs with errors, " 673 "running e2fsck is recommended"); 674 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 675 le16_to_cpu(es->s_mnt_count) >= 676 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 677 ext2_msg(sb, KERN_WARNING, 678 "warning: maximal mount count reached, " 679 "running e2fsck is recommended"); 680 else if (le32_to_cpu(es->s_checkinterval) && 681 (le32_to_cpu(es->s_lastcheck) + 682 le32_to_cpu(es->s_checkinterval) <= get_seconds())) 683 ext2_msg(sb, KERN_WARNING, 684 "warning: checktime reached, " 685 "running e2fsck is recommended"); 686 if (!le16_to_cpu(es->s_max_mnt_count)) 687 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); 688 le16_add_cpu(&es->s_mnt_count, 1); 689 if (test_opt (sb, DEBUG)) 690 ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, " 691 "bpg=%lu, ipg=%lu, mo=%04lx]", 692 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, 693 sbi->s_frag_size, 694 sbi->s_groups_count, 695 EXT2_BLOCKS_PER_GROUP(sb), 696 EXT2_INODES_PER_GROUP(sb), 697 sbi->s_mount_opt); 698 return res; 699 } 700 701 static int ext2_check_descriptors(struct super_block *sb) 702 { 703 int i; 704 struct ext2_sb_info *sbi = EXT2_SB(sb); 705 706 ext2_debug ("Checking group descriptors"); 707 708 for (i = 0; i < sbi->s_groups_count; i++) { 709 struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL); 710 ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i); 711 ext2_fsblk_t last_block; 712 713 if (i == sbi->s_groups_count - 1) 714 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; 715 else 716 last_block = first_block + 717 (EXT2_BLOCKS_PER_GROUP(sb) - 1); 718 719 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || 720 le32_to_cpu(gdp->bg_block_bitmap) > last_block) 721 { 722 ext2_error (sb, "ext2_check_descriptors", 723 "Block bitmap for group %d" 724 " not in group (block %lu)!", 725 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); 726 return 0; 727 } 728 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || 729 le32_to_cpu(gdp->bg_inode_bitmap) > last_block) 730 { 731 ext2_error (sb, "ext2_check_descriptors", 732 "Inode bitmap for group %d" 733 " not in group (block %lu)!", 734 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); 735 return 0; 736 } 737 if (le32_to_cpu(gdp->bg_inode_table) < first_block || 738 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > 739 last_block) 740 { 741 ext2_error (sb, "ext2_check_descriptors", 742 "Inode table for group %d" 743 " not in group (block %lu)!", 744 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); 745 return 0; 746 } 747 } 748 return 1; 749 } 750 751 /* 752 * Maximal file size. There is a direct, and {,double-,triple-}indirect 753 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. 754 * We need to be 1 filesystem block less than the 2^32 sector limit. 755 */ 756 static loff_t ext2_max_size(int bits) 757 { 758 loff_t res = EXT2_NDIR_BLOCKS; 759 int meta_blocks; 760 loff_t upper_limit; 761 762 /* This is calculated to be the largest file size for a 763 * dense, file such that the total number of 764 * sectors in the file, including data and all indirect blocks, 765 * does not exceed 2^32 -1 766 * __u32 i_blocks representing the total number of 767 * 512 bytes blocks of the file 768 */ 769 upper_limit = (1LL << 32) - 1; 770 771 /* total blocks in file system block size */ 772 upper_limit >>= (bits - 9); 773 774 775 /* indirect blocks */ 776 meta_blocks = 1; 777 /* double indirect blocks */ 778 meta_blocks += 1 + (1LL << (bits-2)); 779 /* tripple indirect blocks */ 780 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); 781 782 upper_limit -= meta_blocks; 783 upper_limit <<= bits; 784 785 res += 1LL << (bits-2); 786 res += 1LL << (2*(bits-2)); 787 res += 1LL << (3*(bits-2)); 788 res <<= bits; 789 if (res > upper_limit) 790 res = upper_limit; 791 792 if (res > MAX_LFS_FILESIZE) 793 res = MAX_LFS_FILESIZE; 794 795 return res; 796 } 797 798 static unsigned long descriptor_loc(struct super_block *sb, 799 unsigned long logic_sb_block, 800 int nr) 801 { 802 struct ext2_sb_info *sbi = EXT2_SB(sb); 803 unsigned long bg, first_meta_bg; 804 int has_super = 0; 805 806 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 807 808 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || 809 nr < first_meta_bg) 810 return (logic_sb_block + nr + 1); 811 bg = sbi->s_desc_per_block * nr; 812 if (ext2_bg_has_super(sb, bg)) 813 has_super = 1; 814 815 return ext2_group_first_block_no(sb, bg) + has_super; 816 } 817 818 static int ext2_fill_super(struct super_block *sb, void *data, int silent) 819 { 820 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev); 821 struct buffer_head * bh; 822 struct ext2_sb_info * sbi; 823 struct ext2_super_block * es; 824 struct inode *root; 825 unsigned long block; 826 unsigned long sb_block = get_sb_block(&data); 827 unsigned long logic_sb_block; 828 unsigned long offset = 0; 829 unsigned long def_mount_opts; 830 long ret = -ENOMEM; 831 int blocksize = BLOCK_SIZE; 832 int db_count; 833 int i, j; 834 __le32 features; 835 int err; 836 struct ext2_mount_options opts; 837 838 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 839 if (!sbi) 840 goto failed; 841 842 sbi->s_blockgroup_lock = 843 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); 844 if (!sbi->s_blockgroup_lock) { 845 kfree(sbi); 846 goto failed; 847 } 848 sb->s_fs_info = sbi; 849 sbi->s_sb_block = sb_block; 850 sbi->s_daxdev = dax_dev; 851 852 spin_lock_init(&sbi->s_lock); 853 ret = -EINVAL; 854 855 /* 856 * See what the current blocksize for the device is, and 857 * use that as the blocksize. Otherwise (or if the blocksize 858 * is smaller than the default) use the default. 859 * This is important for devices that have a hardware 860 * sectorsize that is larger than the default. 861 */ 862 blocksize = sb_min_blocksize(sb, BLOCK_SIZE); 863 if (!blocksize) { 864 ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); 865 goto failed_sbi; 866 } 867 868 /* 869 * If the superblock doesn't start on a hardware sector boundary, 870 * calculate the offset. 871 */ 872 if (blocksize != BLOCK_SIZE) { 873 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 874 offset = (sb_block*BLOCK_SIZE) % blocksize; 875 } else { 876 logic_sb_block = sb_block; 877 } 878 879 if (!(bh = sb_bread(sb, logic_sb_block))) { 880 ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); 881 goto failed_sbi; 882 } 883 /* 884 * Note: s_es must be initialized as soon as possible because 885 * some ext2 macro-instructions depend on its value 886 */ 887 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 888 sbi->s_es = es; 889 sb->s_magic = le16_to_cpu(es->s_magic); 890 891 if (sb->s_magic != EXT2_SUPER_MAGIC) 892 goto cantfind_ext2; 893 894 /* Set defaults before we parse the mount options */ 895 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 896 if (def_mount_opts & EXT2_DEFM_DEBUG) 897 set_opt(opts.s_mount_opt, DEBUG); 898 if (def_mount_opts & EXT2_DEFM_BSDGROUPS) 899 set_opt(opts.s_mount_opt, GRPID); 900 if (def_mount_opts & EXT2_DEFM_UID16) 901 set_opt(opts.s_mount_opt, NO_UID32); 902 #ifdef CONFIG_EXT2_FS_XATTR 903 if (def_mount_opts & EXT2_DEFM_XATTR_USER) 904 set_opt(opts.s_mount_opt, XATTR_USER); 905 #endif 906 #ifdef CONFIG_EXT2_FS_POSIX_ACL 907 if (def_mount_opts & EXT2_DEFM_ACL) 908 set_opt(opts.s_mount_opt, POSIX_ACL); 909 #endif 910 911 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) 912 set_opt(opts.s_mount_opt, ERRORS_PANIC); 913 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) 914 set_opt(opts.s_mount_opt, ERRORS_CONT); 915 else 916 set_opt(opts.s_mount_opt, ERRORS_RO); 917 918 opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); 919 opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); 920 921 set_opt(opts.s_mount_opt, RESERVATION); 922 923 if (!parse_options((char *) data, sb, &opts)) 924 goto failed_mount; 925 926 sbi->s_mount_opt = opts.s_mount_opt; 927 sbi->s_resuid = opts.s_resuid; 928 sbi->s_resgid = opts.s_resgid; 929 930 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | 931 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? 932 SB_POSIXACL : 0); 933 sb->s_iflags |= SB_I_CGROUPWB; 934 935 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && 936 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || 937 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 938 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) 939 ext2_msg(sb, KERN_WARNING, 940 "warning: feature flags set on rev 0 fs, " 941 "running e2fsck is recommended"); 942 /* 943 * Check feature flags regardless of the revision level, since we 944 * previously didn't change the revision level when setting the flags, 945 * so there is a chance incompat flags are set on a rev 0 filesystem. 946 */ 947 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); 948 if (features) { 949 ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " 950 "unsupported optional features (%x)", 951 le32_to_cpu(features)); 952 goto failed_mount; 953 } 954 if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ 955 ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " 956 "unsupported optional features (%x)", 957 le32_to_cpu(features)); 958 goto failed_mount; 959 } 960 961 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); 962 963 if (sbi->s_mount_opt & EXT2_MOUNT_DAX) { 964 err = bdev_dax_supported(sb, blocksize); 965 if (err) { 966 ext2_msg(sb, KERN_ERR, 967 "DAX unsupported by block device. Turning off DAX."); 968 sbi->s_mount_opt &= ~EXT2_MOUNT_DAX; 969 } 970 } 971 972 /* If the blocksize doesn't match, re-read the thing.. */ 973 if (sb->s_blocksize != blocksize) { 974 brelse(bh); 975 976 if (!sb_set_blocksize(sb, blocksize)) { 977 ext2_msg(sb, KERN_ERR, 978 "error: bad blocksize %d", blocksize); 979 goto failed_sbi; 980 } 981 982 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 983 offset = (sb_block*BLOCK_SIZE) % blocksize; 984 bh = sb_bread(sb, logic_sb_block); 985 if(!bh) { 986 ext2_msg(sb, KERN_ERR, "error: couldn't read" 987 "superblock on 2nd try"); 988 goto failed_sbi; 989 } 990 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 991 sbi->s_es = es; 992 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { 993 ext2_msg(sb, KERN_ERR, "error: magic mismatch"); 994 goto failed_mount; 995 } 996 } 997 998 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); 999 sb->s_max_links = EXT2_LINK_MAX; 1000 1001 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { 1002 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; 1003 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; 1004 } else { 1005 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 1006 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 1007 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || 1008 !is_power_of_2(sbi->s_inode_size) || 1009 (sbi->s_inode_size > blocksize)) { 1010 ext2_msg(sb, KERN_ERR, 1011 "error: unsupported inode size: %d", 1012 sbi->s_inode_size); 1013 goto failed_mount; 1014 } 1015 } 1016 1017 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << 1018 le32_to_cpu(es->s_log_frag_size); 1019 if (sbi->s_frag_size == 0) 1020 goto cantfind_ext2; 1021 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; 1022 1023 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 1024 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); 1025 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 1026 1027 if (EXT2_INODE_SIZE(sb) == 0) 1028 goto cantfind_ext2; 1029 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); 1030 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) 1031 goto cantfind_ext2; 1032 sbi->s_itb_per_group = sbi->s_inodes_per_group / 1033 sbi->s_inodes_per_block; 1034 sbi->s_desc_per_block = sb->s_blocksize / 1035 sizeof (struct ext2_group_desc); 1036 sbi->s_sbh = bh; 1037 sbi->s_mount_state = le16_to_cpu(es->s_state); 1038 sbi->s_addr_per_block_bits = 1039 ilog2 (EXT2_ADDR_PER_BLOCK(sb)); 1040 sbi->s_desc_per_block_bits = 1041 ilog2 (EXT2_DESC_PER_BLOCK(sb)); 1042 1043 if (sb->s_magic != EXT2_SUPER_MAGIC) 1044 goto cantfind_ext2; 1045 1046 if (sb->s_blocksize != bh->b_size) { 1047 if (!silent) 1048 ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); 1049 goto failed_mount; 1050 } 1051 1052 if (sb->s_blocksize != sbi->s_frag_size) { 1053 ext2_msg(sb, KERN_ERR, 1054 "error: fragsize %lu != blocksize %lu" 1055 "(not supported yet)", 1056 sbi->s_frag_size, sb->s_blocksize); 1057 goto failed_mount; 1058 } 1059 1060 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { 1061 ext2_msg(sb, KERN_ERR, 1062 "error: #blocks per group too big: %lu", 1063 sbi->s_blocks_per_group); 1064 goto failed_mount; 1065 } 1066 if (sbi->s_frags_per_group > sb->s_blocksize * 8) { 1067 ext2_msg(sb, KERN_ERR, 1068 "error: #fragments per group too big: %lu", 1069 sbi->s_frags_per_group); 1070 goto failed_mount; 1071 } 1072 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { 1073 ext2_msg(sb, KERN_ERR, 1074 "error: #inodes per group too big: %lu", 1075 sbi->s_inodes_per_group); 1076 goto failed_mount; 1077 } 1078 1079 if (EXT2_BLOCKS_PER_GROUP(sb) == 0) 1080 goto cantfind_ext2; 1081 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - 1082 le32_to_cpu(es->s_first_data_block) - 1) 1083 / EXT2_BLOCKS_PER_GROUP(sb)) + 1; 1084 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / 1085 EXT2_DESC_PER_BLOCK(sb); 1086 sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL); 1087 if (sbi->s_group_desc == NULL) { 1088 ext2_msg(sb, KERN_ERR, "error: not enough memory"); 1089 goto failed_mount; 1090 } 1091 bgl_lock_init(sbi->s_blockgroup_lock); 1092 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); 1093 if (!sbi->s_debts) { 1094 ext2_msg(sb, KERN_ERR, "error: not enough memory"); 1095 goto failed_mount_group_desc; 1096 } 1097 for (i = 0; i < db_count; i++) { 1098 block = descriptor_loc(sb, logic_sb_block, i); 1099 sbi->s_group_desc[i] = sb_bread(sb, block); 1100 if (!sbi->s_group_desc[i]) { 1101 for (j = 0; j < i; j++) 1102 brelse (sbi->s_group_desc[j]); 1103 ext2_msg(sb, KERN_ERR, 1104 "error: unable to read group descriptors"); 1105 goto failed_mount_group_desc; 1106 } 1107 } 1108 if (!ext2_check_descriptors (sb)) { 1109 ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); 1110 goto failed_mount2; 1111 } 1112 sbi->s_gdb_count = db_count; 1113 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 1114 spin_lock_init(&sbi->s_next_gen_lock); 1115 1116 /* per fileystem reservation list head & lock */ 1117 spin_lock_init(&sbi->s_rsv_window_lock); 1118 sbi->s_rsv_window_root = RB_ROOT; 1119 /* 1120 * Add a single, static dummy reservation to the start of the 1121 * reservation window list --- it gives us a placeholder for 1122 * append-at-start-of-list which makes the allocation logic 1123 * _much_ simpler. 1124 */ 1125 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; 1126 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; 1127 sbi->s_rsv_window_head.rsv_alloc_hit = 0; 1128 sbi->s_rsv_window_head.rsv_goal_size = 0; 1129 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); 1130 1131 err = percpu_counter_init(&sbi->s_freeblocks_counter, 1132 ext2_count_free_blocks(sb), GFP_KERNEL); 1133 if (!err) { 1134 err = percpu_counter_init(&sbi->s_freeinodes_counter, 1135 ext2_count_free_inodes(sb), GFP_KERNEL); 1136 } 1137 if (!err) { 1138 err = percpu_counter_init(&sbi->s_dirs_counter, 1139 ext2_count_dirs(sb), GFP_KERNEL); 1140 } 1141 if (err) { 1142 ext2_msg(sb, KERN_ERR, "error: insufficient memory"); 1143 goto failed_mount3; 1144 } 1145 1146 #ifdef CONFIG_EXT2_FS_XATTR 1147 sbi->s_ea_block_cache = ext2_xattr_create_cache(); 1148 if (!sbi->s_ea_block_cache) { 1149 ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache"); 1150 goto failed_mount3; 1151 } 1152 #endif 1153 /* 1154 * set up enough so that it can read an inode 1155 */ 1156 sb->s_op = &ext2_sops; 1157 sb->s_export_op = &ext2_export_ops; 1158 sb->s_xattr = ext2_xattr_handlers; 1159 1160 #ifdef CONFIG_QUOTA 1161 sb->dq_op = &dquot_operations; 1162 sb->s_qcop = &ext2_quotactl_ops; 1163 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1164 #endif 1165 1166 root = ext2_iget(sb, EXT2_ROOT_INO); 1167 if (IS_ERR(root)) { 1168 ret = PTR_ERR(root); 1169 goto failed_mount3; 1170 } 1171 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 1172 iput(root); 1173 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); 1174 goto failed_mount3; 1175 } 1176 1177 sb->s_root = d_make_root(root); 1178 if (!sb->s_root) { 1179 ext2_msg(sb, KERN_ERR, "error: get root inode failed"); 1180 ret = -ENOMEM; 1181 goto failed_mount3; 1182 } 1183 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 1184 ext2_msg(sb, KERN_WARNING, 1185 "warning: mounting ext3 filesystem as ext2"); 1186 if (ext2_setup_super (sb, es, sb_rdonly(sb))) 1187 sb->s_flags |= SB_RDONLY; 1188 ext2_write_super(sb); 1189 return 0; 1190 1191 cantfind_ext2: 1192 if (!silent) 1193 ext2_msg(sb, KERN_ERR, 1194 "error: can't find an ext2 filesystem on dev %s.", 1195 sb->s_id); 1196 goto failed_mount; 1197 failed_mount3: 1198 if (sbi->s_ea_block_cache) 1199 ext2_xattr_destroy_cache(sbi->s_ea_block_cache); 1200 percpu_counter_destroy(&sbi->s_freeblocks_counter); 1201 percpu_counter_destroy(&sbi->s_freeinodes_counter); 1202 percpu_counter_destroy(&sbi->s_dirs_counter); 1203 failed_mount2: 1204 for (i = 0; i < db_count; i++) 1205 brelse(sbi->s_group_desc[i]); 1206 failed_mount_group_desc: 1207 kfree(sbi->s_group_desc); 1208 kfree(sbi->s_debts); 1209 failed_mount: 1210 brelse(bh); 1211 failed_sbi: 1212 sb->s_fs_info = NULL; 1213 kfree(sbi->s_blockgroup_lock); 1214 kfree(sbi); 1215 failed: 1216 fs_put_dax(dax_dev); 1217 return ret; 1218 } 1219 1220 static void ext2_clear_super_error(struct super_block *sb) 1221 { 1222 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; 1223 1224 if (buffer_write_io_error(sbh)) { 1225 /* 1226 * Oh, dear. A previous attempt to write the 1227 * superblock failed. This could happen because the 1228 * USB device was yanked out. Or it could happen to 1229 * be a transient write error and maybe the block will 1230 * be remapped. Nothing we can do but to retry the 1231 * write and hope for the best. 1232 */ 1233 ext2_msg(sb, KERN_ERR, 1234 "previous I/O error to superblock detected"); 1235 clear_buffer_write_io_error(sbh); 1236 set_buffer_uptodate(sbh); 1237 } 1238 } 1239 1240 void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, 1241 int wait) 1242 { 1243 ext2_clear_super_error(sb); 1244 spin_lock(&EXT2_SB(sb)->s_lock); 1245 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); 1246 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); 1247 es->s_wtime = cpu_to_le32(get_seconds()); 1248 /* unlock before we do IO */ 1249 spin_unlock(&EXT2_SB(sb)->s_lock); 1250 mark_buffer_dirty(EXT2_SB(sb)->s_sbh); 1251 if (wait) 1252 sync_dirty_buffer(EXT2_SB(sb)->s_sbh); 1253 } 1254 1255 /* 1256 * In the second extended file system, it is not necessary to 1257 * write the super block since we use a mapping of the 1258 * disk super block in a buffer. 1259 * 1260 * However, this function is still used to set the fs valid 1261 * flags to 0. We need to set this flag to 0 since the fs 1262 * may have been checked while mounted and e2fsck may have 1263 * set s_state to EXT2_VALID_FS after some corrections. 1264 */ 1265 static int ext2_sync_fs(struct super_block *sb, int wait) 1266 { 1267 struct ext2_sb_info *sbi = EXT2_SB(sb); 1268 struct ext2_super_block *es = EXT2_SB(sb)->s_es; 1269 1270 /* 1271 * Write quota structures to quota file, sync_blockdev() will write 1272 * them to disk later 1273 */ 1274 dquot_writeback_dquots(sb, -1); 1275 1276 spin_lock(&sbi->s_lock); 1277 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { 1278 ext2_debug("setting valid to 0\n"); 1279 es->s_state &= cpu_to_le16(~EXT2_VALID_FS); 1280 } 1281 spin_unlock(&sbi->s_lock); 1282 ext2_sync_super(sb, es, wait); 1283 return 0; 1284 } 1285 1286 static int ext2_freeze(struct super_block *sb) 1287 { 1288 struct ext2_sb_info *sbi = EXT2_SB(sb); 1289 1290 /* 1291 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared 1292 * because we have unattached inodes and thus filesystem is not fully 1293 * consistent. 1294 */ 1295 if (atomic_long_read(&sb->s_remove_count)) { 1296 ext2_sync_fs(sb, 1); 1297 return 0; 1298 } 1299 /* Set EXT2_FS_VALID flag */ 1300 spin_lock(&sbi->s_lock); 1301 sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state); 1302 spin_unlock(&sbi->s_lock); 1303 ext2_sync_super(sb, sbi->s_es, 1); 1304 1305 return 0; 1306 } 1307 1308 static int ext2_unfreeze(struct super_block *sb) 1309 { 1310 /* Just write sb to clear EXT2_VALID_FS flag */ 1311 ext2_write_super(sb); 1312 1313 return 0; 1314 } 1315 1316 static void ext2_write_super(struct super_block *sb) 1317 { 1318 if (!sb_rdonly(sb)) 1319 ext2_sync_fs(sb, 1); 1320 } 1321 1322 static int ext2_remount (struct super_block * sb, int * flags, char * data) 1323 { 1324 struct ext2_sb_info * sbi = EXT2_SB(sb); 1325 struct ext2_super_block * es; 1326 struct ext2_mount_options new_opts; 1327 int err; 1328 1329 sync_filesystem(sb); 1330 1331 spin_lock(&sbi->s_lock); 1332 new_opts.s_mount_opt = sbi->s_mount_opt; 1333 new_opts.s_resuid = sbi->s_resuid; 1334 new_opts.s_resgid = sbi->s_resgid; 1335 spin_unlock(&sbi->s_lock); 1336 1337 /* 1338 * Allow the "check" option to be passed as a remount option. 1339 */ 1340 if (!parse_options(data, sb, &new_opts)) 1341 return -EINVAL; 1342 1343 spin_lock(&sbi->s_lock); 1344 es = sbi->s_es; 1345 if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) { 1346 ext2_msg(sb, KERN_WARNING, "warning: refusing change of " 1347 "dax flag with busy inodes while remounting"); 1348 new_opts.s_mount_opt ^= EXT2_MOUNT_DAX; 1349 } 1350 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) 1351 goto out_set; 1352 if (*flags & SB_RDONLY) { 1353 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || 1354 !(sbi->s_mount_state & EXT2_VALID_FS)) 1355 goto out_set; 1356 1357 /* 1358 * OK, we are remounting a valid rw partition rdonly, so set 1359 * the rdonly flag and then mark the partition as valid again. 1360 */ 1361 es->s_state = cpu_to_le16(sbi->s_mount_state); 1362 es->s_mtime = cpu_to_le32(get_seconds()); 1363 spin_unlock(&sbi->s_lock); 1364 1365 err = dquot_suspend(sb, -1); 1366 if (err < 0) 1367 return err; 1368 1369 ext2_sync_super(sb, es, 1); 1370 } else { 1371 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, 1372 ~EXT2_FEATURE_RO_COMPAT_SUPP); 1373 if (ret) { 1374 spin_unlock(&sbi->s_lock); 1375 ext2_msg(sb, KERN_WARNING, 1376 "warning: couldn't remount RDWR because of " 1377 "unsupported optional features (%x).", 1378 le32_to_cpu(ret)); 1379 return -EROFS; 1380 } 1381 /* 1382 * Mounting a RDONLY partition read-write, so reread and 1383 * store the current valid flag. (It may have been changed 1384 * by e2fsck since we originally mounted the partition.) 1385 */ 1386 sbi->s_mount_state = le16_to_cpu(es->s_state); 1387 if (!ext2_setup_super (sb, es, 0)) 1388 sb->s_flags &= ~SB_RDONLY; 1389 spin_unlock(&sbi->s_lock); 1390 1391 ext2_write_super(sb); 1392 1393 dquot_resume(sb, -1); 1394 } 1395 1396 spin_lock(&sbi->s_lock); 1397 out_set: 1398 sbi->s_mount_opt = new_opts.s_mount_opt; 1399 sbi->s_resuid = new_opts.s_resuid; 1400 sbi->s_resgid = new_opts.s_resgid; 1401 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | 1402 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? SB_POSIXACL : 0); 1403 spin_unlock(&sbi->s_lock); 1404 1405 return 0; 1406 } 1407 1408 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) 1409 { 1410 struct super_block *sb = dentry->d_sb; 1411 struct ext2_sb_info *sbi = EXT2_SB(sb); 1412 struct ext2_super_block *es = sbi->s_es; 1413 u64 fsid; 1414 1415 spin_lock(&sbi->s_lock); 1416 1417 if (test_opt (sb, MINIX_DF)) 1418 sbi->s_overhead_last = 0; 1419 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { 1420 unsigned long i, overhead = 0; 1421 smp_rmb(); 1422 1423 /* 1424 * Compute the overhead (FS structures). This is constant 1425 * for a given filesystem unless the number of block groups 1426 * changes so we cache the previous value until it does. 1427 */ 1428 1429 /* 1430 * All of the blocks before first_data_block are 1431 * overhead 1432 */ 1433 overhead = le32_to_cpu(es->s_first_data_block); 1434 1435 /* 1436 * Add the overhead attributed to the superblock and 1437 * block group descriptors. If the sparse superblocks 1438 * feature is turned on, then not all groups have this. 1439 */ 1440 for (i = 0; i < sbi->s_groups_count; i++) 1441 overhead += ext2_bg_has_super(sb, i) + 1442 ext2_bg_num_gdb(sb, i); 1443 1444 /* 1445 * Every block group has an inode bitmap, a block 1446 * bitmap, and an inode table. 1447 */ 1448 overhead += (sbi->s_groups_count * 1449 (2 + sbi->s_itb_per_group)); 1450 sbi->s_overhead_last = overhead; 1451 smp_wmb(); 1452 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); 1453 } 1454 1455 buf->f_type = EXT2_SUPER_MAGIC; 1456 buf->f_bsize = sb->s_blocksize; 1457 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; 1458 buf->f_bfree = ext2_count_free_blocks(sb); 1459 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); 1460 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); 1461 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) 1462 buf->f_bavail = 0; 1463 buf->f_files = le32_to_cpu(es->s_inodes_count); 1464 buf->f_ffree = ext2_count_free_inodes(sb); 1465 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); 1466 buf->f_namelen = EXT2_NAME_LEN; 1467 fsid = le64_to_cpup((void *)es->s_uuid) ^ 1468 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 1469 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 1470 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 1471 spin_unlock(&sbi->s_lock); 1472 return 0; 1473 } 1474 1475 static struct dentry *ext2_mount(struct file_system_type *fs_type, 1476 int flags, const char *dev_name, void *data) 1477 { 1478 return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super); 1479 } 1480 1481 #ifdef CONFIG_QUOTA 1482 1483 /* Read data from quotafile - avoid pagecache and such because we cannot afford 1484 * acquiring the locks... As quota files are never truncated and quota code 1485 * itself serializes the operations (and no one else should touch the files) 1486 * we don't have to be afraid of races */ 1487 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, 1488 size_t len, loff_t off) 1489 { 1490 struct inode *inode = sb_dqopt(sb)->files[type]; 1491 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1492 int err = 0; 1493 int offset = off & (sb->s_blocksize - 1); 1494 int tocopy; 1495 size_t toread; 1496 struct buffer_head tmp_bh; 1497 struct buffer_head *bh; 1498 loff_t i_size = i_size_read(inode); 1499 1500 if (off > i_size) 1501 return 0; 1502 if (off+len > i_size) 1503 len = i_size-off; 1504 toread = len; 1505 while (toread > 0) { 1506 tocopy = sb->s_blocksize - offset < toread ? 1507 sb->s_blocksize - offset : toread; 1508 1509 tmp_bh.b_state = 0; 1510 tmp_bh.b_size = sb->s_blocksize; 1511 err = ext2_get_block(inode, blk, &tmp_bh, 0); 1512 if (err < 0) 1513 return err; 1514 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 1515 memset(data, 0, tocopy); 1516 else { 1517 bh = sb_bread(sb, tmp_bh.b_blocknr); 1518 if (!bh) 1519 return -EIO; 1520 memcpy(data, bh->b_data+offset, tocopy); 1521 brelse(bh); 1522 } 1523 offset = 0; 1524 toread -= tocopy; 1525 data += tocopy; 1526 blk++; 1527 } 1528 return len; 1529 } 1530 1531 /* Write to quotafile */ 1532 static ssize_t ext2_quota_write(struct super_block *sb, int type, 1533 const char *data, size_t len, loff_t off) 1534 { 1535 struct inode *inode = sb_dqopt(sb)->files[type]; 1536 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1537 int err = 0; 1538 int offset = off & (sb->s_blocksize - 1); 1539 int tocopy; 1540 size_t towrite = len; 1541 struct buffer_head tmp_bh; 1542 struct buffer_head *bh; 1543 1544 while (towrite > 0) { 1545 tocopy = sb->s_blocksize - offset < towrite ? 1546 sb->s_blocksize - offset : towrite; 1547 1548 tmp_bh.b_state = 0; 1549 tmp_bh.b_size = sb->s_blocksize; 1550 err = ext2_get_block(inode, blk, &tmp_bh, 1); 1551 if (err < 0) 1552 goto out; 1553 if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) 1554 bh = sb_bread(sb, tmp_bh.b_blocknr); 1555 else 1556 bh = sb_getblk(sb, tmp_bh.b_blocknr); 1557 if (unlikely(!bh)) { 1558 err = -EIO; 1559 goto out; 1560 } 1561 lock_buffer(bh); 1562 memcpy(bh->b_data+offset, data, tocopy); 1563 flush_dcache_page(bh->b_page); 1564 set_buffer_uptodate(bh); 1565 mark_buffer_dirty(bh); 1566 unlock_buffer(bh); 1567 brelse(bh); 1568 offset = 0; 1569 towrite -= tocopy; 1570 data += tocopy; 1571 blk++; 1572 } 1573 out: 1574 if (len == towrite) 1575 return err; 1576 if (inode->i_size < off+len-towrite) 1577 i_size_write(inode, off+len-towrite); 1578 inode_inc_iversion(inode); 1579 inode->i_mtime = inode->i_ctime = current_time(inode); 1580 mark_inode_dirty(inode); 1581 return len - towrite; 1582 } 1583 1584 static int ext2_quota_on(struct super_block *sb, int type, int format_id, 1585 const struct path *path) 1586 { 1587 int err; 1588 struct inode *inode; 1589 1590 err = dquot_quota_on(sb, type, format_id, path); 1591 if (err) 1592 return err; 1593 1594 inode = d_inode(path->dentry); 1595 inode_lock(inode); 1596 EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL; 1597 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, 1598 S_NOATIME | S_IMMUTABLE); 1599 inode_unlock(inode); 1600 mark_inode_dirty(inode); 1601 1602 return 0; 1603 } 1604 1605 static int ext2_quota_off(struct super_block *sb, int type) 1606 { 1607 struct inode *inode = sb_dqopt(sb)->files[type]; 1608 int err; 1609 1610 if (!inode || !igrab(inode)) 1611 goto out; 1612 1613 err = dquot_quota_off(sb, type); 1614 if (err) 1615 goto out_put; 1616 1617 inode_lock(inode); 1618 EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL); 1619 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); 1620 inode_unlock(inode); 1621 mark_inode_dirty(inode); 1622 out_put: 1623 iput(inode); 1624 return err; 1625 out: 1626 return dquot_quota_off(sb, type); 1627 } 1628 1629 #endif 1630 1631 static struct file_system_type ext2_fs_type = { 1632 .owner = THIS_MODULE, 1633 .name = "ext2", 1634 .mount = ext2_mount, 1635 .kill_sb = kill_block_super, 1636 .fs_flags = FS_REQUIRES_DEV, 1637 }; 1638 MODULE_ALIAS_FS("ext2"); 1639 1640 static int __init init_ext2_fs(void) 1641 { 1642 int err; 1643 1644 err = init_inodecache(); 1645 if (err) 1646 return err; 1647 err = register_filesystem(&ext2_fs_type); 1648 if (err) 1649 goto out; 1650 return 0; 1651 out: 1652 destroy_inodecache(); 1653 return err; 1654 } 1655 1656 static void __exit exit_ext2_fs(void) 1657 { 1658 unregister_filesystem(&ext2_fs_type); 1659 destroy_inodecache(); 1660 } 1661 1662 MODULE_AUTHOR("Remy Card and others"); 1663 MODULE_DESCRIPTION("Second Extended Filesystem"); 1664 MODULE_LICENSE("GPL"); 1665 module_init(init_ext2_fs) 1666 module_exit(exit_ext2_fs) 1667