1 /* 2 * linux/fs/ext2/super.c 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/fs/minix/inode.c 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 * 15 * Big-endian to little-endian byte-swapping/bitmaps by 16 * David S. Miller (davem@caip.rutgers.edu), 1995 17 */ 18 19 #include <linux/module.h> 20 #include <linux/string.h> 21 #include <linux/fs.h> 22 #include <linux/slab.h> 23 #include <linux/init.h> 24 #include <linux/blkdev.h> 25 #include <linux/parser.h> 26 #include <linux/random.h> 27 #include <linux/buffer_head.h> 28 #include <linux/exportfs.h> 29 #include <linux/vfs.h> 30 #include <linux/seq_file.h> 31 #include <linux/mount.h> 32 #include <linux/log2.h> 33 #include <linux/quotaops.h> 34 #include <linux/uaccess.h> 35 #include <linux/dax.h> 36 #include <linux/iversion.h> 37 #include "ext2.h" 38 #include "xattr.h" 39 #include "acl.h" 40 41 static void ext2_write_super(struct super_block *sb); 42 static int ext2_remount (struct super_block * sb, int * flags, char * data); 43 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf); 44 static int ext2_sync_fs(struct super_block *sb, int wait); 45 static int ext2_freeze(struct super_block *sb); 46 static int ext2_unfreeze(struct super_block *sb); 47 48 void ext2_error(struct super_block *sb, const char *function, 49 const char *fmt, ...) 50 { 51 struct va_format vaf; 52 va_list args; 53 struct ext2_sb_info *sbi = EXT2_SB(sb); 54 struct ext2_super_block *es = sbi->s_es; 55 56 if (!sb_rdonly(sb)) { 57 spin_lock(&sbi->s_lock); 58 sbi->s_mount_state |= EXT2_ERROR_FS; 59 es->s_state |= cpu_to_le16(EXT2_ERROR_FS); 60 spin_unlock(&sbi->s_lock); 61 ext2_sync_super(sb, es, 1); 62 } 63 64 va_start(args, fmt); 65 66 vaf.fmt = fmt; 67 vaf.va = &args; 68 69 printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n", 70 sb->s_id, function, &vaf); 71 72 va_end(args); 73 74 if (test_opt(sb, ERRORS_PANIC)) 75 panic("EXT2-fs: panic from previous error\n"); 76 if (!sb_rdonly(sb) && test_opt(sb, ERRORS_RO)) { 77 ext2_msg(sb, KERN_CRIT, 78 "error: remounting filesystem read-only"); 79 sb->s_flags |= SB_RDONLY; 80 } 81 } 82 83 void ext2_msg(struct super_block *sb, const char *prefix, 84 const char *fmt, ...) 85 { 86 struct va_format vaf; 87 va_list args; 88 89 va_start(args, fmt); 90 91 vaf.fmt = fmt; 92 vaf.va = &args; 93 94 printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf); 95 96 va_end(args); 97 } 98 99 /* 100 * This must be called with sbi->s_lock held. 101 */ 102 void ext2_update_dynamic_rev(struct super_block *sb) 103 { 104 struct ext2_super_block *es = EXT2_SB(sb)->s_es; 105 106 if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV) 107 return; 108 109 ext2_msg(sb, KERN_WARNING, 110 "warning: updating to rev %d because of " 111 "new feature flag, running e2fsck is recommended", 112 EXT2_DYNAMIC_REV); 113 114 es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO); 115 es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE); 116 es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV); 117 /* leave es->s_feature_*compat flags alone */ 118 /* es->s_uuid will be set by e2fsck if empty */ 119 120 /* 121 * The rest of the superblock fields should be zero, and if not it 122 * means they are likely already in use, so leave them alone. We 123 * can leave it up to e2fsck to clean up any inconsistencies there. 124 */ 125 } 126 127 #ifdef CONFIG_QUOTA 128 static int ext2_quota_off(struct super_block *sb, int type); 129 130 static void ext2_quota_off_umount(struct super_block *sb) 131 { 132 int type; 133 134 for (type = 0; type < MAXQUOTAS; type++) 135 ext2_quota_off(sb, type); 136 } 137 #else 138 static inline void ext2_quota_off_umount(struct super_block *sb) 139 { 140 } 141 #endif 142 143 static void ext2_put_super (struct super_block * sb) 144 { 145 int db_count; 146 int i; 147 struct ext2_sb_info *sbi = EXT2_SB(sb); 148 149 ext2_quota_off_umount(sb); 150 151 ext2_xattr_destroy_cache(sbi->s_ea_block_cache); 152 sbi->s_ea_block_cache = NULL; 153 154 if (!sb_rdonly(sb)) { 155 struct ext2_super_block *es = sbi->s_es; 156 157 spin_lock(&sbi->s_lock); 158 es->s_state = cpu_to_le16(sbi->s_mount_state); 159 spin_unlock(&sbi->s_lock); 160 ext2_sync_super(sb, es, 1); 161 } 162 db_count = sbi->s_gdb_count; 163 for (i = 0; i < db_count; i++) 164 if (sbi->s_group_desc[i]) 165 brelse (sbi->s_group_desc[i]); 166 kfree(sbi->s_group_desc); 167 kfree(sbi->s_debts); 168 percpu_counter_destroy(&sbi->s_freeblocks_counter); 169 percpu_counter_destroy(&sbi->s_freeinodes_counter); 170 percpu_counter_destroy(&sbi->s_dirs_counter); 171 brelse (sbi->s_sbh); 172 sb->s_fs_info = NULL; 173 kfree(sbi->s_blockgroup_lock); 174 fs_put_dax(sbi->s_daxdev); 175 kfree(sbi); 176 } 177 178 static struct kmem_cache * ext2_inode_cachep; 179 180 static struct inode *ext2_alloc_inode(struct super_block *sb) 181 { 182 struct ext2_inode_info *ei; 183 ei = kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL); 184 if (!ei) 185 return NULL; 186 ei->i_block_alloc_info = NULL; 187 inode_set_iversion(&ei->vfs_inode, 1); 188 #ifdef CONFIG_QUOTA 189 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot)); 190 #endif 191 192 return &ei->vfs_inode; 193 } 194 195 static void ext2_i_callback(struct rcu_head *head) 196 { 197 struct inode *inode = container_of(head, struct inode, i_rcu); 198 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode)); 199 } 200 201 static void ext2_destroy_inode(struct inode *inode) 202 { 203 call_rcu(&inode->i_rcu, ext2_i_callback); 204 } 205 206 static void init_once(void *foo) 207 { 208 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo; 209 210 rwlock_init(&ei->i_meta_lock); 211 #ifdef CONFIG_EXT2_FS_XATTR 212 init_rwsem(&ei->xattr_sem); 213 #endif 214 mutex_init(&ei->truncate_mutex); 215 #ifdef CONFIG_FS_DAX 216 init_rwsem(&ei->dax_sem); 217 #endif 218 inode_init_once(&ei->vfs_inode); 219 } 220 221 static int __init init_inodecache(void) 222 { 223 ext2_inode_cachep = kmem_cache_create_usercopy("ext2_inode_cache", 224 sizeof(struct ext2_inode_info), 0, 225 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| 226 SLAB_ACCOUNT), 227 offsetof(struct ext2_inode_info, i_data), 228 sizeof_field(struct ext2_inode_info, i_data), 229 init_once); 230 if (ext2_inode_cachep == NULL) 231 return -ENOMEM; 232 return 0; 233 } 234 235 static void destroy_inodecache(void) 236 { 237 /* 238 * Make sure all delayed rcu free inodes are flushed before we 239 * destroy cache. 240 */ 241 rcu_barrier(); 242 kmem_cache_destroy(ext2_inode_cachep); 243 } 244 245 static int ext2_show_options(struct seq_file *seq, struct dentry *root) 246 { 247 struct super_block *sb = root->d_sb; 248 struct ext2_sb_info *sbi = EXT2_SB(sb); 249 struct ext2_super_block *es = sbi->s_es; 250 unsigned long def_mount_opts; 251 252 spin_lock(&sbi->s_lock); 253 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 254 255 if (sbi->s_sb_block != 1) 256 seq_printf(seq, ",sb=%lu", sbi->s_sb_block); 257 if (test_opt(sb, MINIX_DF)) 258 seq_puts(seq, ",minixdf"); 259 if (test_opt(sb, GRPID)) 260 seq_puts(seq, ",grpid"); 261 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS)) 262 seq_puts(seq, ",nogrpid"); 263 if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) || 264 le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) { 265 seq_printf(seq, ",resuid=%u", 266 from_kuid_munged(&init_user_ns, sbi->s_resuid)); 267 } 268 if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) || 269 le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) { 270 seq_printf(seq, ",resgid=%u", 271 from_kgid_munged(&init_user_ns, sbi->s_resgid)); 272 } 273 if (test_opt(sb, ERRORS_RO)) { 274 int def_errors = le16_to_cpu(es->s_errors); 275 276 if (def_errors == EXT2_ERRORS_PANIC || 277 def_errors == EXT2_ERRORS_CONTINUE) { 278 seq_puts(seq, ",errors=remount-ro"); 279 } 280 } 281 if (test_opt(sb, ERRORS_CONT)) 282 seq_puts(seq, ",errors=continue"); 283 if (test_opt(sb, ERRORS_PANIC)) 284 seq_puts(seq, ",errors=panic"); 285 if (test_opt(sb, NO_UID32)) 286 seq_puts(seq, ",nouid32"); 287 if (test_opt(sb, DEBUG)) 288 seq_puts(seq, ",debug"); 289 if (test_opt(sb, OLDALLOC)) 290 seq_puts(seq, ",oldalloc"); 291 292 #ifdef CONFIG_EXT2_FS_XATTR 293 if (test_opt(sb, XATTR_USER)) 294 seq_puts(seq, ",user_xattr"); 295 if (!test_opt(sb, XATTR_USER) && 296 (def_mount_opts & EXT2_DEFM_XATTR_USER)) { 297 seq_puts(seq, ",nouser_xattr"); 298 } 299 #endif 300 301 #ifdef CONFIG_EXT2_FS_POSIX_ACL 302 if (test_opt(sb, POSIX_ACL)) 303 seq_puts(seq, ",acl"); 304 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL)) 305 seq_puts(seq, ",noacl"); 306 #endif 307 308 if (test_opt(sb, NOBH)) 309 seq_puts(seq, ",nobh"); 310 311 if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA) 312 seq_puts(seq, ",usrquota"); 313 314 if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA) 315 seq_puts(seq, ",grpquota"); 316 317 if (sbi->s_mount_opt & EXT2_MOUNT_XIP) 318 seq_puts(seq, ",xip"); 319 320 if (sbi->s_mount_opt & EXT2_MOUNT_DAX) 321 seq_puts(seq, ",dax"); 322 323 if (!test_opt(sb, RESERVATION)) 324 seq_puts(seq, ",noreservation"); 325 326 spin_unlock(&sbi->s_lock); 327 return 0; 328 } 329 330 #ifdef CONFIG_QUOTA 331 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); 332 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); 333 static int ext2_quota_on(struct super_block *sb, int type, int format_id, 334 const struct path *path); 335 static struct dquot **ext2_get_dquots(struct inode *inode) 336 { 337 return EXT2_I(inode)->i_dquot; 338 } 339 340 static const struct quotactl_ops ext2_quotactl_ops = { 341 .quota_on = ext2_quota_on, 342 .quota_off = ext2_quota_off, 343 .quota_sync = dquot_quota_sync, 344 .get_state = dquot_get_state, 345 .set_info = dquot_set_dqinfo, 346 .get_dqblk = dquot_get_dqblk, 347 .set_dqblk = dquot_set_dqblk, 348 .get_nextdqblk = dquot_get_next_dqblk, 349 }; 350 #endif 351 352 static const struct super_operations ext2_sops = { 353 .alloc_inode = ext2_alloc_inode, 354 .destroy_inode = ext2_destroy_inode, 355 .write_inode = ext2_write_inode, 356 .evict_inode = ext2_evict_inode, 357 .put_super = ext2_put_super, 358 .sync_fs = ext2_sync_fs, 359 .freeze_fs = ext2_freeze, 360 .unfreeze_fs = ext2_unfreeze, 361 .statfs = ext2_statfs, 362 .remount_fs = ext2_remount, 363 .show_options = ext2_show_options, 364 #ifdef CONFIG_QUOTA 365 .quota_read = ext2_quota_read, 366 .quota_write = ext2_quota_write, 367 .get_dquots = ext2_get_dquots, 368 #endif 369 }; 370 371 static struct inode *ext2_nfs_get_inode(struct super_block *sb, 372 u64 ino, u32 generation) 373 { 374 struct inode *inode; 375 376 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) 377 return ERR_PTR(-ESTALE); 378 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) 379 return ERR_PTR(-ESTALE); 380 381 /* 382 * ext2_iget isn't quite right if the inode is currently unallocated! 383 * However ext2_iget currently does appropriate checks to handle stale 384 * inodes so everything is OK. 385 */ 386 inode = ext2_iget(sb, ino); 387 if (IS_ERR(inode)) 388 return ERR_CAST(inode); 389 if (generation && inode->i_generation != generation) { 390 /* we didn't find the right inode.. */ 391 iput(inode); 392 return ERR_PTR(-ESTALE); 393 } 394 return inode; 395 } 396 397 static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid, 398 int fh_len, int fh_type) 399 { 400 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 401 ext2_nfs_get_inode); 402 } 403 404 static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid, 405 int fh_len, int fh_type) 406 { 407 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 408 ext2_nfs_get_inode); 409 } 410 411 static const struct export_operations ext2_export_ops = { 412 .fh_to_dentry = ext2_fh_to_dentry, 413 .fh_to_parent = ext2_fh_to_parent, 414 .get_parent = ext2_get_parent, 415 }; 416 417 static unsigned long get_sb_block(void **data) 418 { 419 unsigned long sb_block; 420 char *options = (char *) *data; 421 422 if (!options || strncmp(options, "sb=", 3) != 0) 423 return 1; /* Default location */ 424 options += 3; 425 sb_block = simple_strtoul(options, &options, 0); 426 if (*options && *options != ',') { 427 printk("EXT2-fs: Invalid sb specification: %s\n", 428 (char *) *data); 429 return 1; 430 } 431 if (*options == ',') 432 options++; 433 *data = (void *) options; 434 return sb_block; 435 } 436 437 enum { 438 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 439 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, 440 Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug, 441 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, 442 Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota, 443 Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation 444 }; 445 446 static const match_table_t tokens = { 447 {Opt_bsd_df, "bsddf"}, 448 {Opt_minix_df, "minixdf"}, 449 {Opt_grpid, "grpid"}, 450 {Opt_grpid, "bsdgroups"}, 451 {Opt_nogrpid, "nogrpid"}, 452 {Opt_nogrpid, "sysvgroups"}, 453 {Opt_resgid, "resgid=%u"}, 454 {Opt_resuid, "resuid=%u"}, 455 {Opt_sb, "sb=%u"}, 456 {Opt_err_cont, "errors=continue"}, 457 {Opt_err_panic, "errors=panic"}, 458 {Opt_err_ro, "errors=remount-ro"}, 459 {Opt_nouid32, "nouid32"}, 460 {Opt_nocheck, "check=none"}, 461 {Opt_nocheck, "nocheck"}, 462 {Opt_debug, "debug"}, 463 {Opt_oldalloc, "oldalloc"}, 464 {Opt_orlov, "orlov"}, 465 {Opt_nobh, "nobh"}, 466 {Opt_user_xattr, "user_xattr"}, 467 {Opt_nouser_xattr, "nouser_xattr"}, 468 {Opt_acl, "acl"}, 469 {Opt_noacl, "noacl"}, 470 {Opt_xip, "xip"}, 471 {Opt_dax, "dax"}, 472 {Opt_grpquota, "grpquota"}, 473 {Opt_ignore, "noquota"}, 474 {Opt_quota, "quota"}, 475 {Opt_usrquota, "usrquota"}, 476 {Opt_reservation, "reservation"}, 477 {Opt_noreservation, "noreservation"}, 478 {Opt_err, NULL} 479 }; 480 481 static int parse_options(char *options, struct super_block *sb, 482 struct ext2_mount_options *opts) 483 { 484 char *p; 485 substring_t args[MAX_OPT_ARGS]; 486 int option; 487 kuid_t uid; 488 kgid_t gid; 489 490 if (!options) 491 return 1; 492 493 while ((p = strsep (&options, ",")) != NULL) { 494 int token; 495 if (!*p) 496 continue; 497 498 token = match_token(p, tokens, args); 499 switch (token) { 500 case Opt_bsd_df: 501 clear_opt (opts->s_mount_opt, MINIX_DF); 502 break; 503 case Opt_minix_df: 504 set_opt (opts->s_mount_opt, MINIX_DF); 505 break; 506 case Opt_grpid: 507 set_opt (opts->s_mount_opt, GRPID); 508 break; 509 case Opt_nogrpid: 510 clear_opt (opts->s_mount_opt, GRPID); 511 break; 512 case Opt_resuid: 513 if (match_int(&args[0], &option)) 514 return 0; 515 uid = make_kuid(current_user_ns(), option); 516 if (!uid_valid(uid)) { 517 ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option); 518 return 0; 519 520 } 521 opts->s_resuid = uid; 522 break; 523 case Opt_resgid: 524 if (match_int(&args[0], &option)) 525 return 0; 526 gid = make_kgid(current_user_ns(), option); 527 if (!gid_valid(gid)) { 528 ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option); 529 return 0; 530 } 531 opts->s_resgid = gid; 532 break; 533 case Opt_sb: 534 /* handled by get_sb_block() instead of here */ 535 /* *sb_block = match_int(&args[0]); */ 536 break; 537 case Opt_err_panic: 538 clear_opt (opts->s_mount_opt, ERRORS_CONT); 539 clear_opt (opts->s_mount_opt, ERRORS_RO); 540 set_opt (opts->s_mount_opt, ERRORS_PANIC); 541 break; 542 case Opt_err_ro: 543 clear_opt (opts->s_mount_opt, ERRORS_CONT); 544 clear_opt (opts->s_mount_opt, ERRORS_PANIC); 545 set_opt (opts->s_mount_opt, ERRORS_RO); 546 break; 547 case Opt_err_cont: 548 clear_opt (opts->s_mount_opt, ERRORS_RO); 549 clear_opt (opts->s_mount_opt, ERRORS_PANIC); 550 set_opt (opts->s_mount_opt, ERRORS_CONT); 551 break; 552 case Opt_nouid32: 553 set_opt (opts->s_mount_opt, NO_UID32); 554 break; 555 case Opt_nocheck: 556 ext2_msg(sb, KERN_WARNING, 557 "Option nocheck/check=none is deprecated and" 558 " will be removed in June 2020."); 559 clear_opt (opts->s_mount_opt, CHECK); 560 break; 561 case Opt_debug: 562 set_opt (opts->s_mount_opt, DEBUG); 563 break; 564 case Opt_oldalloc: 565 set_opt (opts->s_mount_opt, OLDALLOC); 566 break; 567 case Opt_orlov: 568 clear_opt (opts->s_mount_opt, OLDALLOC); 569 break; 570 case Opt_nobh: 571 set_opt (opts->s_mount_opt, NOBH); 572 break; 573 #ifdef CONFIG_EXT2_FS_XATTR 574 case Opt_user_xattr: 575 set_opt (opts->s_mount_opt, XATTR_USER); 576 break; 577 case Opt_nouser_xattr: 578 clear_opt (opts->s_mount_opt, XATTR_USER); 579 break; 580 #else 581 case Opt_user_xattr: 582 case Opt_nouser_xattr: 583 ext2_msg(sb, KERN_INFO, "(no)user_xattr options" 584 "not supported"); 585 break; 586 #endif 587 #ifdef CONFIG_EXT2_FS_POSIX_ACL 588 case Opt_acl: 589 set_opt(opts->s_mount_opt, POSIX_ACL); 590 break; 591 case Opt_noacl: 592 clear_opt(opts->s_mount_opt, POSIX_ACL); 593 break; 594 #else 595 case Opt_acl: 596 case Opt_noacl: 597 ext2_msg(sb, KERN_INFO, 598 "(no)acl options not supported"); 599 break; 600 #endif 601 case Opt_xip: 602 ext2_msg(sb, KERN_INFO, "use dax instead of xip"); 603 set_opt(opts->s_mount_opt, XIP); 604 /* Fall through */ 605 case Opt_dax: 606 #ifdef CONFIG_FS_DAX 607 ext2_msg(sb, KERN_WARNING, 608 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); 609 set_opt(opts->s_mount_opt, DAX); 610 #else 611 ext2_msg(sb, KERN_INFO, "dax option not supported"); 612 #endif 613 break; 614 615 #if defined(CONFIG_QUOTA) 616 case Opt_quota: 617 case Opt_usrquota: 618 set_opt(opts->s_mount_opt, USRQUOTA); 619 break; 620 621 case Opt_grpquota: 622 set_opt(opts->s_mount_opt, GRPQUOTA); 623 break; 624 #else 625 case Opt_quota: 626 case Opt_usrquota: 627 case Opt_grpquota: 628 ext2_msg(sb, KERN_INFO, 629 "quota operations not supported"); 630 break; 631 #endif 632 633 case Opt_reservation: 634 set_opt(opts->s_mount_opt, RESERVATION); 635 ext2_msg(sb, KERN_INFO, "reservations ON"); 636 break; 637 case Opt_noreservation: 638 clear_opt(opts->s_mount_opt, RESERVATION); 639 ext2_msg(sb, KERN_INFO, "reservations OFF"); 640 break; 641 case Opt_ignore: 642 break; 643 default: 644 return 0; 645 } 646 } 647 return 1; 648 } 649 650 static int ext2_setup_super (struct super_block * sb, 651 struct ext2_super_block * es, 652 int read_only) 653 { 654 int res = 0; 655 struct ext2_sb_info *sbi = EXT2_SB(sb); 656 657 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { 658 ext2_msg(sb, KERN_ERR, 659 "error: revision level too high, " 660 "forcing read-only mode"); 661 res = SB_RDONLY; 662 } 663 if (read_only) 664 return res; 665 if (!(sbi->s_mount_state & EXT2_VALID_FS)) 666 ext2_msg(sb, KERN_WARNING, 667 "warning: mounting unchecked fs, " 668 "running e2fsck is recommended"); 669 else if ((sbi->s_mount_state & EXT2_ERROR_FS)) 670 ext2_msg(sb, KERN_WARNING, 671 "warning: mounting fs with errors, " 672 "running e2fsck is recommended"); 673 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 674 le16_to_cpu(es->s_mnt_count) >= 675 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 676 ext2_msg(sb, KERN_WARNING, 677 "warning: maximal mount count reached, " 678 "running e2fsck is recommended"); 679 else if (le32_to_cpu(es->s_checkinterval) && 680 (le32_to_cpu(es->s_lastcheck) + 681 le32_to_cpu(es->s_checkinterval) <= 682 ktime_get_real_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 opts.s_mount_opt = 0; 895 /* Set defaults before we parse the mount options */ 896 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 897 if (def_mount_opts & EXT2_DEFM_DEBUG) 898 set_opt(opts.s_mount_opt, DEBUG); 899 if (def_mount_opts & EXT2_DEFM_BSDGROUPS) 900 set_opt(opts.s_mount_opt, GRPID); 901 if (def_mount_opts & EXT2_DEFM_UID16) 902 set_opt(opts.s_mount_opt, NO_UID32); 903 #ifdef CONFIG_EXT2_FS_XATTR 904 if (def_mount_opts & EXT2_DEFM_XATTR_USER) 905 set_opt(opts.s_mount_opt, XATTR_USER); 906 #endif 907 #ifdef CONFIG_EXT2_FS_POSIX_ACL 908 if (def_mount_opts & EXT2_DEFM_ACL) 909 set_opt(opts.s_mount_opt, POSIX_ACL); 910 #endif 911 912 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) 913 set_opt(opts.s_mount_opt, ERRORS_PANIC); 914 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) 915 set_opt(opts.s_mount_opt, ERRORS_CONT); 916 else 917 set_opt(opts.s_mount_opt, ERRORS_RO); 918 919 opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); 920 opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); 921 922 set_opt(opts.s_mount_opt, RESERVATION); 923 924 if (!parse_options((char *) data, sb, &opts)) 925 goto failed_mount; 926 927 sbi->s_mount_opt = opts.s_mount_opt; 928 sbi->s_resuid = opts.s_resuid; 929 sbi->s_resgid = opts.s_resgid; 930 931 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | 932 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? 933 SB_POSIXACL : 0); 934 sb->s_iflags |= SB_I_CGROUPWB; 935 936 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && 937 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || 938 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 939 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) 940 ext2_msg(sb, KERN_WARNING, 941 "warning: feature flags set on rev 0 fs, " 942 "running e2fsck is recommended"); 943 /* 944 * Check feature flags regardless of the revision level, since we 945 * previously didn't change the revision level when setting the flags, 946 * so there is a chance incompat flags are set on a rev 0 filesystem. 947 */ 948 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); 949 if (features) { 950 ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " 951 "unsupported optional features (%x)", 952 le32_to_cpu(features)); 953 goto failed_mount; 954 } 955 if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ 956 ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " 957 "unsupported optional features (%x)", 958 le32_to_cpu(features)); 959 goto failed_mount; 960 } 961 962 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); 963 964 if (sbi->s_mount_opt & EXT2_MOUNT_DAX) { 965 if (!bdev_dax_supported(sb->s_bdev, blocksize)) { 966 ext2_msg(sb, KERN_ERR, 967 "DAX unsupported by block device. Turning off DAX."); 968 sbi->s_mount_opt &= ~EXT2_MOUNT_DAX; 969 } 970 } 971 972 /* If the blocksize doesn't match, re-read the thing.. */ 973 if (sb->s_blocksize != blocksize) { 974 brelse(bh); 975 976 if (!sb_set_blocksize(sb, blocksize)) { 977 ext2_msg(sb, KERN_ERR, 978 "error: bad blocksize %d", blocksize); 979 goto failed_sbi; 980 } 981 982 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 983 offset = (sb_block*BLOCK_SIZE) % blocksize; 984 bh = sb_bread(sb, logic_sb_block); 985 if(!bh) { 986 ext2_msg(sb, KERN_ERR, "error: couldn't read" 987 "superblock on 2nd try"); 988 goto failed_sbi; 989 } 990 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 991 sbi->s_es = es; 992 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { 993 ext2_msg(sb, KERN_ERR, "error: magic mismatch"); 994 goto failed_mount; 995 } 996 } 997 998 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); 999 sb->s_max_links = EXT2_LINK_MAX; 1000 1001 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { 1002 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; 1003 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; 1004 } else { 1005 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 1006 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 1007 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || 1008 !is_power_of_2(sbi->s_inode_size) || 1009 (sbi->s_inode_size > blocksize)) { 1010 ext2_msg(sb, KERN_ERR, 1011 "error: unsupported inode size: %d", 1012 sbi->s_inode_size); 1013 goto failed_mount; 1014 } 1015 } 1016 1017 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << 1018 le32_to_cpu(es->s_log_frag_size); 1019 if (sbi->s_frag_size == 0) 1020 goto cantfind_ext2; 1021 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; 1022 1023 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 1024 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); 1025 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 1026 1027 if (EXT2_INODE_SIZE(sb) == 0) 1028 goto cantfind_ext2; 1029 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); 1030 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) 1031 goto cantfind_ext2; 1032 sbi->s_itb_per_group = sbi->s_inodes_per_group / 1033 sbi->s_inodes_per_block; 1034 sbi->s_desc_per_block = sb->s_blocksize / 1035 sizeof (struct ext2_group_desc); 1036 sbi->s_sbh = bh; 1037 sbi->s_mount_state = le16_to_cpu(es->s_state); 1038 sbi->s_addr_per_block_bits = 1039 ilog2 (EXT2_ADDR_PER_BLOCK(sb)); 1040 sbi->s_desc_per_block_bits = 1041 ilog2 (EXT2_DESC_PER_BLOCK(sb)); 1042 1043 if (sb->s_magic != EXT2_SUPER_MAGIC) 1044 goto cantfind_ext2; 1045 1046 if (sb->s_blocksize != bh->b_size) { 1047 if (!silent) 1048 ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); 1049 goto failed_mount; 1050 } 1051 1052 if (sb->s_blocksize != sbi->s_frag_size) { 1053 ext2_msg(sb, KERN_ERR, 1054 "error: fragsize %lu != blocksize %lu" 1055 "(not supported yet)", 1056 sbi->s_frag_size, sb->s_blocksize); 1057 goto failed_mount; 1058 } 1059 1060 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { 1061 ext2_msg(sb, KERN_ERR, 1062 "error: #blocks per group too big: %lu", 1063 sbi->s_blocks_per_group); 1064 goto failed_mount; 1065 } 1066 if (sbi->s_frags_per_group > sb->s_blocksize * 8) { 1067 ext2_msg(sb, KERN_ERR, 1068 "error: #fragments per group too big: %lu", 1069 sbi->s_frags_per_group); 1070 goto failed_mount; 1071 } 1072 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { 1073 ext2_msg(sb, KERN_ERR, 1074 "error: #inodes per group too big: %lu", 1075 sbi->s_inodes_per_group); 1076 goto failed_mount; 1077 } 1078 1079 if (EXT2_BLOCKS_PER_GROUP(sb) == 0) 1080 goto cantfind_ext2; 1081 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - 1082 le32_to_cpu(es->s_first_data_block) - 1) 1083 / EXT2_BLOCKS_PER_GROUP(sb)) + 1; 1084 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / 1085 EXT2_DESC_PER_BLOCK(sb); 1086 sbi->s_group_desc = kmalloc_array (db_count, 1087 sizeof(struct buffer_head *), 1088 GFP_KERNEL); 1089 if (sbi->s_group_desc == NULL) { 1090 ext2_msg(sb, KERN_ERR, "error: not enough memory"); 1091 goto failed_mount; 1092 } 1093 bgl_lock_init(sbi->s_blockgroup_lock); 1094 sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); 1095 if (!sbi->s_debts) { 1096 ext2_msg(sb, KERN_ERR, "error: not enough memory"); 1097 goto failed_mount_group_desc; 1098 } 1099 for (i = 0; i < db_count; i++) { 1100 block = descriptor_loc(sb, logic_sb_block, i); 1101 sbi->s_group_desc[i] = sb_bread(sb, block); 1102 if (!sbi->s_group_desc[i]) { 1103 for (j = 0; j < i; j++) 1104 brelse (sbi->s_group_desc[j]); 1105 ext2_msg(sb, KERN_ERR, 1106 "error: unable to read group descriptors"); 1107 goto failed_mount_group_desc; 1108 } 1109 } 1110 if (!ext2_check_descriptors (sb)) { 1111 ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); 1112 goto failed_mount2; 1113 } 1114 sbi->s_gdb_count = db_count; 1115 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 1116 spin_lock_init(&sbi->s_next_gen_lock); 1117 1118 /* per fileystem reservation list head & lock */ 1119 spin_lock_init(&sbi->s_rsv_window_lock); 1120 sbi->s_rsv_window_root = RB_ROOT; 1121 /* 1122 * Add a single, static dummy reservation to the start of the 1123 * reservation window list --- it gives us a placeholder for 1124 * append-at-start-of-list which makes the allocation logic 1125 * _much_ simpler. 1126 */ 1127 sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; 1128 sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; 1129 sbi->s_rsv_window_head.rsv_alloc_hit = 0; 1130 sbi->s_rsv_window_head.rsv_goal_size = 0; 1131 ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); 1132 1133 err = percpu_counter_init(&sbi->s_freeblocks_counter, 1134 ext2_count_free_blocks(sb), GFP_KERNEL); 1135 if (!err) { 1136 err = percpu_counter_init(&sbi->s_freeinodes_counter, 1137 ext2_count_free_inodes(sb), GFP_KERNEL); 1138 } 1139 if (!err) { 1140 err = percpu_counter_init(&sbi->s_dirs_counter, 1141 ext2_count_dirs(sb), GFP_KERNEL); 1142 } 1143 if (err) { 1144 ext2_msg(sb, KERN_ERR, "error: insufficient memory"); 1145 goto failed_mount3; 1146 } 1147 1148 #ifdef CONFIG_EXT2_FS_XATTR 1149 sbi->s_ea_block_cache = ext2_xattr_create_cache(); 1150 if (!sbi->s_ea_block_cache) { 1151 ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache"); 1152 goto failed_mount3; 1153 } 1154 #endif 1155 /* 1156 * set up enough so that it can read an inode 1157 */ 1158 sb->s_op = &ext2_sops; 1159 sb->s_export_op = &ext2_export_ops; 1160 sb->s_xattr = ext2_xattr_handlers; 1161 1162 #ifdef CONFIG_QUOTA 1163 sb->dq_op = &dquot_operations; 1164 sb->s_qcop = &ext2_quotactl_ops; 1165 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1166 #endif 1167 1168 root = ext2_iget(sb, EXT2_ROOT_INO); 1169 if (IS_ERR(root)) { 1170 ret = PTR_ERR(root); 1171 goto failed_mount3; 1172 } 1173 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 1174 iput(root); 1175 ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); 1176 goto failed_mount3; 1177 } 1178 1179 sb->s_root = d_make_root(root); 1180 if (!sb->s_root) { 1181 ext2_msg(sb, KERN_ERR, "error: get root inode failed"); 1182 ret = -ENOMEM; 1183 goto failed_mount3; 1184 } 1185 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 1186 ext2_msg(sb, KERN_WARNING, 1187 "warning: mounting ext3 filesystem as ext2"); 1188 if (ext2_setup_super (sb, es, sb_rdonly(sb))) 1189 sb->s_flags |= SB_RDONLY; 1190 ext2_write_super(sb); 1191 return 0; 1192 1193 cantfind_ext2: 1194 if (!silent) 1195 ext2_msg(sb, KERN_ERR, 1196 "error: can't find an ext2 filesystem on dev %s.", 1197 sb->s_id); 1198 goto failed_mount; 1199 failed_mount3: 1200 ext2_xattr_destroy_cache(sbi->s_ea_block_cache); 1201 percpu_counter_destroy(&sbi->s_freeblocks_counter); 1202 percpu_counter_destroy(&sbi->s_freeinodes_counter); 1203 percpu_counter_destroy(&sbi->s_dirs_counter); 1204 failed_mount2: 1205 for (i = 0; i < db_count; i++) 1206 brelse(sbi->s_group_desc[i]); 1207 failed_mount_group_desc: 1208 kfree(sbi->s_group_desc); 1209 kfree(sbi->s_debts); 1210 failed_mount: 1211 brelse(bh); 1212 failed_sbi: 1213 sb->s_fs_info = NULL; 1214 kfree(sbi->s_blockgroup_lock); 1215 kfree(sbi); 1216 failed: 1217 fs_put_dax(dax_dev); 1218 return ret; 1219 } 1220 1221 static void ext2_clear_super_error(struct super_block *sb) 1222 { 1223 struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; 1224 1225 if (buffer_write_io_error(sbh)) { 1226 /* 1227 * Oh, dear. A previous attempt to write the 1228 * superblock failed. This could happen because the 1229 * USB device was yanked out. Or it could happen to 1230 * be a transient write error and maybe the block will 1231 * be remapped. Nothing we can do but to retry the 1232 * write and hope for the best. 1233 */ 1234 ext2_msg(sb, KERN_ERR, 1235 "previous I/O error to superblock detected"); 1236 clear_buffer_write_io_error(sbh); 1237 set_buffer_uptodate(sbh); 1238 } 1239 } 1240 1241 void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, 1242 int wait) 1243 { 1244 ext2_clear_super_error(sb); 1245 spin_lock(&EXT2_SB(sb)->s_lock); 1246 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); 1247 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); 1248 es->s_wtime = cpu_to_le32(ktime_get_real_seconds()); 1249 /* unlock before we do IO */ 1250 spin_unlock(&EXT2_SB(sb)->s_lock); 1251 mark_buffer_dirty(EXT2_SB(sb)->s_sbh); 1252 if (wait) 1253 sync_dirty_buffer(EXT2_SB(sb)->s_sbh); 1254 } 1255 1256 /* 1257 * In the second extended file system, it is not necessary to 1258 * write the super block since we use a mapping of the 1259 * disk super block in a buffer. 1260 * 1261 * However, this function is still used to set the fs valid 1262 * flags to 0. We need to set this flag to 0 since the fs 1263 * may have been checked while mounted and e2fsck may have 1264 * set s_state to EXT2_VALID_FS after some corrections. 1265 */ 1266 static int ext2_sync_fs(struct super_block *sb, int wait) 1267 { 1268 struct ext2_sb_info *sbi = EXT2_SB(sb); 1269 struct ext2_super_block *es = EXT2_SB(sb)->s_es; 1270 1271 /* 1272 * Write quota structures to quota file, sync_blockdev() will write 1273 * them to disk later 1274 */ 1275 dquot_writeback_dquots(sb, -1); 1276 1277 spin_lock(&sbi->s_lock); 1278 if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { 1279 ext2_debug("setting valid to 0\n"); 1280 es->s_state &= cpu_to_le16(~EXT2_VALID_FS); 1281 } 1282 spin_unlock(&sbi->s_lock); 1283 ext2_sync_super(sb, es, wait); 1284 return 0; 1285 } 1286 1287 static int ext2_freeze(struct super_block *sb) 1288 { 1289 struct ext2_sb_info *sbi = EXT2_SB(sb); 1290 1291 /* 1292 * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared 1293 * because we have unattached inodes and thus filesystem is not fully 1294 * consistent. 1295 */ 1296 if (atomic_long_read(&sb->s_remove_count)) { 1297 ext2_sync_fs(sb, 1); 1298 return 0; 1299 } 1300 /* Set EXT2_FS_VALID flag */ 1301 spin_lock(&sbi->s_lock); 1302 sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state); 1303 spin_unlock(&sbi->s_lock); 1304 ext2_sync_super(sb, sbi->s_es, 1); 1305 1306 return 0; 1307 } 1308 1309 static int ext2_unfreeze(struct super_block *sb) 1310 { 1311 /* Just write sb to clear EXT2_VALID_FS flag */ 1312 ext2_write_super(sb); 1313 1314 return 0; 1315 } 1316 1317 static void ext2_write_super(struct super_block *sb) 1318 { 1319 if (!sb_rdonly(sb)) 1320 ext2_sync_fs(sb, 1); 1321 } 1322 1323 static int ext2_remount (struct super_block * sb, int * flags, char * data) 1324 { 1325 struct ext2_sb_info * sbi = EXT2_SB(sb); 1326 struct ext2_super_block * es; 1327 struct ext2_mount_options new_opts; 1328 int err; 1329 1330 sync_filesystem(sb); 1331 1332 spin_lock(&sbi->s_lock); 1333 new_opts.s_mount_opt = sbi->s_mount_opt; 1334 new_opts.s_resuid = sbi->s_resuid; 1335 new_opts.s_resgid = sbi->s_resgid; 1336 spin_unlock(&sbi->s_lock); 1337 1338 if (!parse_options(data, sb, &new_opts)) 1339 return -EINVAL; 1340 1341 spin_lock(&sbi->s_lock); 1342 es = sbi->s_es; 1343 if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) { 1344 ext2_msg(sb, KERN_WARNING, "warning: refusing change of " 1345 "dax flag with busy inodes while remounting"); 1346 new_opts.s_mount_opt ^= EXT2_MOUNT_DAX; 1347 } 1348 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) 1349 goto out_set; 1350 if (*flags & SB_RDONLY) { 1351 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || 1352 !(sbi->s_mount_state & EXT2_VALID_FS)) 1353 goto out_set; 1354 1355 /* 1356 * OK, we are remounting a valid rw partition rdonly, so set 1357 * the rdonly flag and then mark the partition as valid again. 1358 */ 1359 es->s_state = cpu_to_le16(sbi->s_mount_state); 1360 es->s_mtime = cpu_to_le32(ktime_get_real_seconds()); 1361 spin_unlock(&sbi->s_lock); 1362 1363 err = dquot_suspend(sb, -1); 1364 if (err < 0) 1365 return err; 1366 1367 ext2_sync_super(sb, es, 1); 1368 } else { 1369 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, 1370 ~EXT2_FEATURE_RO_COMPAT_SUPP); 1371 if (ret) { 1372 spin_unlock(&sbi->s_lock); 1373 ext2_msg(sb, KERN_WARNING, 1374 "warning: couldn't remount RDWR because of " 1375 "unsupported optional features (%x).", 1376 le32_to_cpu(ret)); 1377 return -EROFS; 1378 } 1379 /* 1380 * Mounting a RDONLY partition read-write, so reread and 1381 * store the current valid flag. (It may have been changed 1382 * by e2fsck since we originally mounted the partition.) 1383 */ 1384 sbi->s_mount_state = le16_to_cpu(es->s_state); 1385 if (!ext2_setup_super (sb, es, 0)) 1386 sb->s_flags &= ~SB_RDONLY; 1387 spin_unlock(&sbi->s_lock); 1388 1389 ext2_write_super(sb); 1390 1391 dquot_resume(sb, -1); 1392 } 1393 1394 spin_lock(&sbi->s_lock); 1395 out_set: 1396 sbi->s_mount_opt = new_opts.s_mount_opt; 1397 sbi->s_resuid = new_opts.s_resuid; 1398 sbi->s_resgid = new_opts.s_resgid; 1399 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | 1400 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? SB_POSIXACL : 0); 1401 spin_unlock(&sbi->s_lock); 1402 1403 return 0; 1404 } 1405 1406 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) 1407 { 1408 struct super_block *sb = dentry->d_sb; 1409 struct ext2_sb_info *sbi = EXT2_SB(sb); 1410 struct ext2_super_block *es = sbi->s_es; 1411 u64 fsid; 1412 1413 spin_lock(&sbi->s_lock); 1414 1415 if (test_opt (sb, MINIX_DF)) 1416 sbi->s_overhead_last = 0; 1417 else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { 1418 unsigned long i, overhead = 0; 1419 smp_rmb(); 1420 1421 /* 1422 * Compute the overhead (FS structures). This is constant 1423 * for a given filesystem unless the number of block groups 1424 * changes so we cache the previous value until it does. 1425 */ 1426 1427 /* 1428 * All of the blocks before first_data_block are 1429 * overhead 1430 */ 1431 overhead = le32_to_cpu(es->s_first_data_block); 1432 1433 /* 1434 * Add the overhead attributed to the superblock and 1435 * block group descriptors. If the sparse superblocks 1436 * feature is turned on, then not all groups have this. 1437 */ 1438 for (i = 0; i < sbi->s_groups_count; i++) 1439 overhead += ext2_bg_has_super(sb, i) + 1440 ext2_bg_num_gdb(sb, i); 1441 1442 /* 1443 * Every block group has an inode bitmap, a block 1444 * bitmap, and an inode table. 1445 */ 1446 overhead += (sbi->s_groups_count * 1447 (2 + sbi->s_itb_per_group)); 1448 sbi->s_overhead_last = overhead; 1449 smp_wmb(); 1450 sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); 1451 } 1452 1453 buf->f_type = EXT2_SUPER_MAGIC; 1454 buf->f_bsize = sb->s_blocksize; 1455 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; 1456 buf->f_bfree = ext2_count_free_blocks(sb); 1457 es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); 1458 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); 1459 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) 1460 buf->f_bavail = 0; 1461 buf->f_files = le32_to_cpu(es->s_inodes_count); 1462 buf->f_ffree = ext2_count_free_inodes(sb); 1463 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); 1464 buf->f_namelen = EXT2_NAME_LEN; 1465 fsid = le64_to_cpup((void *)es->s_uuid) ^ 1466 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 1467 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 1468 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 1469 spin_unlock(&sbi->s_lock); 1470 return 0; 1471 } 1472 1473 static struct dentry *ext2_mount(struct file_system_type *fs_type, 1474 int flags, const char *dev_name, void *data) 1475 { 1476 return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super); 1477 } 1478 1479 #ifdef CONFIG_QUOTA 1480 1481 /* Read data from quotafile - avoid pagecache and such because we cannot afford 1482 * acquiring the locks... As quota files are never truncated and quota code 1483 * itself serializes the operations (and no one else should touch the files) 1484 * we don't have to be afraid of races */ 1485 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, 1486 size_t len, loff_t off) 1487 { 1488 struct inode *inode = sb_dqopt(sb)->files[type]; 1489 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1490 int err = 0; 1491 int offset = off & (sb->s_blocksize - 1); 1492 int tocopy; 1493 size_t toread; 1494 struct buffer_head tmp_bh; 1495 struct buffer_head *bh; 1496 loff_t i_size = i_size_read(inode); 1497 1498 if (off > i_size) 1499 return 0; 1500 if (off+len > i_size) 1501 len = i_size-off; 1502 toread = len; 1503 while (toread > 0) { 1504 tocopy = sb->s_blocksize - offset < toread ? 1505 sb->s_blocksize - offset : toread; 1506 1507 tmp_bh.b_state = 0; 1508 tmp_bh.b_size = sb->s_blocksize; 1509 err = ext2_get_block(inode, blk, &tmp_bh, 0); 1510 if (err < 0) 1511 return err; 1512 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 1513 memset(data, 0, tocopy); 1514 else { 1515 bh = sb_bread(sb, tmp_bh.b_blocknr); 1516 if (!bh) 1517 return -EIO; 1518 memcpy(data, bh->b_data+offset, tocopy); 1519 brelse(bh); 1520 } 1521 offset = 0; 1522 toread -= tocopy; 1523 data += tocopy; 1524 blk++; 1525 } 1526 return len; 1527 } 1528 1529 /* Write to quotafile */ 1530 static ssize_t ext2_quota_write(struct super_block *sb, int type, 1531 const char *data, size_t len, loff_t off) 1532 { 1533 struct inode *inode = sb_dqopt(sb)->files[type]; 1534 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1535 int err = 0; 1536 int offset = off & (sb->s_blocksize - 1); 1537 int tocopy; 1538 size_t towrite = len; 1539 struct buffer_head tmp_bh; 1540 struct buffer_head *bh; 1541 1542 while (towrite > 0) { 1543 tocopy = sb->s_blocksize - offset < towrite ? 1544 sb->s_blocksize - offset : towrite; 1545 1546 tmp_bh.b_state = 0; 1547 tmp_bh.b_size = sb->s_blocksize; 1548 err = ext2_get_block(inode, blk, &tmp_bh, 1); 1549 if (err < 0) 1550 goto out; 1551 if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) 1552 bh = sb_bread(sb, tmp_bh.b_blocknr); 1553 else 1554 bh = sb_getblk(sb, tmp_bh.b_blocknr); 1555 if (unlikely(!bh)) { 1556 err = -EIO; 1557 goto out; 1558 } 1559 lock_buffer(bh); 1560 memcpy(bh->b_data+offset, data, tocopy); 1561 flush_dcache_page(bh->b_page); 1562 set_buffer_uptodate(bh); 1563 mark_buffer_dirty(bh); 1564 unlock_buffer(bh); 1565 brelse(bh); 1566 offset = 0; 1567 towrite -= tocopy; 1568 data += tocopy; 1569 blk++; 1570 } 1571 out: 1572 if (len == towrite) 1573 return err; 1574 if (inode->i_size < off+len-towrite) 1575 i_size_write(inode, off+len-towrite); 1576 inode_inc_iversion(inode); 1577 inode->i_mtime = inode->i_ctime = current_time(inode); 1578 mark_inode_dirty(inode); 1579 return len - towrite; 1580 } 1581 1582 static int ext2_quota_on(struct super_block *sb, int type, int format_id, 1583 const struct path *path) 1584 { 1585 int err; 1586 struct inode *inode; 1587 1588 err = dquot_quota_on(sb, type, format_id, path); 1589 if (err) 1590 return err; 1591 1592 inode = d_inode(path->dentry); 1593 inode_lock(inode); 1594 EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL; 1595 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, 1596 S_NOATIME | S_IMMUTABLE); 1597 inode_unlock(inode); 1598 mark_inode_dirty(inode); 1599 1600 return 0; 1601 } 1602 1603 static int ext2_quota_off(struct super_block *sb, int type) 1604 { 1605 struct inode *inode = sb_dqopt(sb)->files[type]; 1606 int err; 1607 1608 if (!inode || !igrab(inode)) 1609 goto out; 1610 1611 err = dquot_quota_off(sb, type); 1612 if (err) 1613 goto out_put; 1614 1615 inode_lock(inode); 1616 EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL); 1617 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); 1618 inode_unlock(inode); 1619 mark_inode_dirty(inode); 1620 out_put: 1621 iput(inode); 1622 return err; 1623 out: 1624 return dquot_quota_off(sb, type); 1625 } 1626 1627 #endif 1628 1629 static struct file_system_type ext2_fs_type = { 1630 .owner = THIS_MODULE, 1631 .name = "ext2", 1632 .mount = ext2_mount, 1633 .kill_sb = kill_block_super, 1634 .fs_flags = FS_REQUIRES_DEV, 1635 }; 1636 MODULE_ALIAS_FS("ext2"); 1637 1638 static int __init init_ext2_fs(void) 1639 { 1640 int err; 1641 1642 err = init_inodecache(); 1643 if (err) 1644 return err; 1645 err = register_filesystem(&ext2_fs_type); 1646 if (err) 1647 goto out; 1648 return 0; 1649 out: 1650 destroy_inodecache(); 1651 return err; 1652 } 1653 1654 static void __exit exit_ext2_fs(void) 1655 { 1656 unregister_filesystem(&ext2_fs_type); 1657 destroy_inodecache(); 1658 } 1659 1660 MODULE_AUTHOR("Remy Card and others"); 1661 MODULE_DESCRIPTION("Second Extended Filesystem"); 1662 MODULE_LICENSE("GPL"); 1663 module_init(init_ext2_fs) 1664 module_exit(exit_ext2_fs) 1665