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/config.h> 20 #include <linux/module.h> 21 #include <linux/string.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/smp_lock.h> 29 #include <linux/vfs.h> 30 #include <asm/uaccess.h> 31 #include "ext2.h" 32 #include "xattr.h" 33 #include "acl.h" 34 #include "xip.h" 35 36 static void ext2_sync_super(struct super_block *sb, 37 struct ext2_super_block *es); 38 static int ext2_remount (struct super_block * sb, int * flags, char * data); 39 static int ext2_statfs (struct super_block * sb, struct kstatfs * buf); 40 41 void ext2_error (struct super_block * sb, const char * function, 42 const char * fmt, ...) 43 { 44 va_list args; 45 struct ext2_sb_info *sbi = EXT2_SB(sb); 46 struct ext2_super_block *es = sbi->s_es; 47 48 if (!(sb->s_flags & MS_RDONLY)) { 49 sbi->s_mount_state |= EXT2_ERROR_FS; 50 es->s_state = 51 cpu_to_le16(le16_to_cpu(es->s_state) | EXT2_ERROR_FS); 52 ext2_sync_super(sb, es); 53 } 54 55 va_start(args, fmt); 56 printk(KERN_CRIT "EXT2-fs error (device %s): %s: ",sb->s_id, function); 57 vprintk(fmt, args); 58 printk("\n"); 59 va_end(args); 60 61 if (test_opt(sb, ERRORS_PANIC)) 62 panic("EXT2-fs panic from previous error\n"); 63 if (test_opt(sb, ERRORS_RO)) { 64 printk("Remounting filesystem read-only\n"); 65 sb->s_flags |= MS_RDONLY; 66 } 67 } 68 69 void ext2_warning (struct super_block * sb, const char * function, 70 const char * fmt, ...) 71 { 72 va_list args; 73 74 va_start(args, fmt); 75 printk(KERN_WARNING "EXT2-fs warning (device %s): %s: ", 76 sb->s_id, function); 77 vprintk(fmt, args); 78 printk("\n"); 79 va_end(args); 80 } 81 82 void ext2_update_dynamic_rev(struct super_block *sb) 83 { 84 struct ext2_super_block *es = EXT2_SB(sb)->s_es; 85 86 if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV) 87 return; 88 89 ext2_warning(sb, __FUNCTION__, 90 "updating to rev %d because of new feature flag, " 91 "running e2fsck is recommended", 92 EXT2_DYNAMIC_REV); 93 94 es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO); 95 es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE); 96 es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV); 97 /* leave es->s_feature_*compat flags alone */ 98 /* es->s_uuid will be set by e2fsck if empty */ 99 100 /* 101 * The rest of the superblock fields should be zero, and if not it 102 * means they are likely already in use, so leave them alone. We 103 * can leave it up to e2fsck to clean up any inconsistencies there. 104 */ 105 } 106 107 static void ext2_put_super (struct super_block * sb) 108 { 109 int db_count; 110 int i; 111 struct ext2_sb_info *sbi = EXT2_SB(sb); 112 113 ext2_xattr_put_super(sb); 114 if (!(sb->s_flags & MS_RDONLY)) { 115 struct ext2_super_block *es = sbi->s_es; 116 117 es->s_state = cpu_to_le16(sbi->s_mount_state); 118 ext2_sync_super(sb, es); 119 } 120 db_count = sbi->s_gdb_count; 121 for (i = 0; i < db_count; i++) 122 if (sbi->s_group_desc[i]) 123 brelse (sbi->s_group_desc[i]); 124 kfree(sbi->s_group_desc); 125 kfree(sbi->s_debts); 126 percpu_counter_destroy(&sbi->s_freeblocks_counter); 127 percpu_counter_destroy(&sbi->s_freeinodes_counter); 128 percpu_counter_destroy(&sbi->s_dirs_counter); 129 brelse (sbi->s_sbh); 130 sb->s_fs_info = NULL; 131 kfree(sbi); 132 133 return; 134 } 135 136 static kmem_cache_t * ext2_inode_cachep; 137 138 static struct inode *ext2_alloc_inode(struct super_block *sb) 139 { 140 struct ext2_inode_info *ei; 141 ei = (struct ext2_inode_info *)kmem_cache_alloc(ext2_inode_cachep, SLAB_KERNEL); 142 if (!ei) 143 return NULL; 144 #ifdef CONFIG_EXT2_FS_POSIX_ACL 145 ei->i_acl = EXT2_ACL_NOT_CACHED; 146 ei->i_default_acl = EXT2_ACL_NOT_CACHED; 147 #endif 148 ei->vfs_inode.i_version = 1; 149 return &ei->vfs_inode; 150 } 151 152 static void ext2_destroy_inode(struct inode *inode) 153 { 154 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode)); 155 } 156 157 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) 158 { 159 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo; 160 161 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == 162 SLAB_CTOR_CONSTRUCTOR) { 163 rwlock_init(&ei->i_meta_lock); 164 #ifdef CONFIG_EXT2_FS_XATTR 165 init_rwsem(&ei->xattr_sem); 166 #endif 167 inode_init_once(&ei->vfs_inode); 168 } 169 } 170 171 static int init_inodecache(void) 172 { 173 ext2_inode_cachep = kmem_cache_create("ext2_inode_cache", 174 sizeof(struct ext2_inode_info), 175 0, SLAB_RECLAIM_ACCOUNT, 176 init_once, NULL); 177 if (ext2_inode_cachep == NULL) 178 return -ENOMEM; 179 return 0; 180 } 181 182 static void destroy_inodecache(void) 183 { 184 if (kmem_cache_destroy(ext2_inode_cachep)) 185 printk(KERN_INFO "ext2_inode_cache: not all structures were freed\n"); 186 } 187 188 static void ext2_clear_inode(struct inode *inode) 189 { 190 #ifdef CONFIG_EXT2_FS_POSIX_ACL 191 struct ext2_inode_info *ei = EXT2_I(inode); 192 193 if (ei->i_acl && ei->i_acl != EXT2_ACL_NOT_CACHED) { 194 posix_acl_release(ei->i_acl); 195 ei->i_acl = EXT2_ACL_NOT_CACHED; 196 } 197 if (ei->i_default_acl && ei->i_default_acl != EXT2_ACL_NOT_CACHED) { 198 posix_acl_release(ei->i_default_acl); 199 ei->i_default_acl = EXT2_ACL_NOT_CACHED; 200 } 201 #endif 202 } 203 204 #ifdef CONFIG_QUOTA 205 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); 206 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); 207 #endif 208 209 static struct super_operations ext2_sops = { 210 .alloc_inode = ext2_alloc_inode, 211 .destroy_inode = ext2_destroy_inode, 212 .read_inode = ext2_read_inode, 213 .write_inode = ext2_write_inode, 214 .put_inode = ext2_put_inode, 215 .delete_inode = ext2_delete_inode, 216 .put_super = ext2_put_super, 217 .write_super = ext2_write_super, 218 .statfs = ext2_statfs, 219 .remount_fs = ext2_remount, 220 .clear_inode = ext2_clear_inode, 221 #ifdef CONFIG_QUOTA 222 .quota_read = ext2_quota_read, 223 .quota_write = ext2_quota_write, 224 #endif 225 }; 226 227 /* Yes, most of these are left as NULL!! 228 * A NULL value implies the default, which works with ext2-like file 229 * systems, but can be improved upon. 230 * Currently only get_parent is required. 231 */ 232 struct dentry *ext2_get_parent(struct dentry *child); 233 static struct export_operations ext2_export_ops = { 234 .get_parent = ext2_get_parent, 235 }; 236 237 static unsigned long get_sb_block(void **data) 238 { 239 unsigned long sb_block; 240 char *options = (char *) *data; 241 242 if (!options || strncmp(options, "sb=", 3) != 0) 243 return 1; /* Default location */ 244 options += 3; 245 sb_block = simple_strtoul(options, &options, 0); 246 if (*options && *options != ',') { 247 printk("EXT2-fs: Invalid sb specification: %s\n", 248 (char *) *data); 249 return 1; 250 } 251 if (*options == ',') 252 options++; 253 *data = (void *) options; 254 return sb_block; 255 } 256 257 enum { 258 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 259 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, 260 Opt_nouid32, Opt_check, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov, Opt_nobh, 261 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, Opt_xip, 262 Opt_ignore, Opt_err, 263 }; 264 265 static match_table_t tokens = { 266 {Opt_bsd_df, "bsddf"}, 267 {Opt_minix_df, "minixdf"}, 268 {Opt_grpid, "grpid"}, 269 {Opt_grpid, "bsdgroups"}, 270 {Opt_nogrpid, "nogrpid"}, 271 {Opt_nogrpid, "sysvgroups"}, 272 {Opt_resgid, "resgid=%u"}, 273 {Opt_resuid, "resuid=%u"}, 274 {Opt_sb, "sb=%u"}, 275 {Opt_err_cont, "errors=continue"}, 276 {Opt_err_panic, "errors=panic"}, 277 {Opt_err_ro, "errors=remount-ro"}, 278 {Opt_nouid32, "nouid32"}, 279 {Opt_nocheck, "check=none"}, 280 {Opt_nocheck, "nocheck"}, 281 {Opt_check, "check"}, 282 {Opt_debug, "debug"}, 283 {Opt_oldalloc, "oldalloc"}, 284 {Opt_orlov, "orlov"}, 285 {Opt_nobh, "nobh"}, 286 {Opt_user_xattr, "user_xattr"}, 287 {Opt_nouser_xattr, "nouser_xattr"}, 288 {Opt_acl, "acl"}, 289 {Opt_noacl, "noacl"}, 290 {Opt_xip, "xip"}, 291 {Opt_ignore, "grpquota"}, 292 {Opt_ignore, "noquota"}, 293 {Opt_ignore, "quota"}, 294 {Opt_ignore, "usrquota"}, 295 {Opt_err, NULL} 296 }; 297 298 static int parse_options (char * options, 299 struct ext2_sb_info *sbi) 300 { 301 char * p; 302 substring_t args[MAX_OPT_ARGS]; 303 unsigned long kind = EXT2_MOUNT_ERRORS_CONT; 304 int option; 305 306 if (!options) 307 return 1; 308 309 while ((p = strsep (&options, ",")) != NULL) { 310 int token; 311 if (!*p) 312 continue; 313 314 token = match_token(p, tokens, args); 315 switch (token) { 316 case Opt_bsd_df: 317 clear_opt (sbi->s_mount_opt, MINIX_DF); 318 break; 319 case Opt_minix_df: 320 set_opt (sbi->s_mount_opt, MINIX_DF); 321 break; 322 case Opt_grpid: 323 set_opt (sbi->s_mount_opt, GRPID); 324 break; 325 case Opt_nogrpid: 326 clear_opt (sbi->s_mount_opt, GRPID); 327 break; 328 case Opt_resuid: 329 if (match_int(&args[0], &option)) 330 return 0; 331 sbi->s_resuid = option; 332 break; 333 case Opt_resgid: 334 if (match_int(&args[0], &option)) 335 return 0; 336 sbi->s_resgid = option; 337 break; 338 case Opt_sb: 339 /* handled by get_sb_block() instead of here */ 340 /* *sb_block = match_int(&args[0]); */ 341 break; 342 case Opt_err_panic: 343 kind = EXT2_MOUNT_ERRORS_PANIC; 344 break; 345 case Opt_err_ro: 346 kind = EXT2_MOUNT_ERRORS_RO; 347 break; 348 case Opt_err_cont: 349 kind = EXT2_MOUNT_ERRORS_CONT; 350 break; 351 case Opt_nouid32: 352 set_opt (sbi->s_mount_opt, NO_UID32); 353 break; 354 case Opt_check: 355 #ifdef CONFIG_EXT2_CHECK 356 set_opt (sbi->s_mount_opt, CHECK); 357 #else 358 printk("EXT2 Check option not supported\n"); 359 #endif 360 break; 361 case Opt_nocheck: 362 clear_opt (sbi->s_mount_opt, CHECK); 363 break; 364 case Opt_debug: 365 set_opt (sbi->s_mount_opt, DEBUG); 366 break; 367 case Opt_oldalloc: 368 set_opt (sbi->s_mount_opt, OLDALLOC); 369 break; 370 case Opt_orlov: 371 clear_opt (sbi->s_mount_opt, OLDALLOC); 372 break; 373 case Opt_nobh: 374 set_opt (sbi->s_mount_opt, NOBH); 375 break; 376 #ifdef CONFIG_EXT2_FS_XATTR 377 case Opt_user_xattr: 378 set_opt (sbi->s_mount_opt, XATTR_USER); 379 break; 380 case Opt_nouser_xattr: 381 clear_opt (sbi->s_mount_opt, XATTR_USER); 382 break; 383 #else 384 case Opt_user_xattr: 385 case Opt_nouser_xattr: 386 printk("EXT2 (no)user_xattr options not supported\n"); 387 break; 388 #endif 389 #ifdef CONFIG_EXT2_FS_POSIX_ACL 390 case Opt_acl: 391 set_opt(sbi->s_mount_opt, POSIX_ACL); 392 break; 393 case Opt_noacl: 394 clear_opt(sbi->s_mount_opt, POSIX_ACL); 395 break; 396 #else 397 case Opt_acl: 398 case Opt_noacl: 399 printk("EXT2 (no)acl options not supported\n"); 400 break; 401 #endif 402 case Opt_xip: 403 #ifdef CONFIG_EXT2_FS_XIP 404 set_opt (sbi->s_mount_opt, XIP); 405 #else 406 printk("EXT2 xip option not supported\n"); 407 #endif 408 break; 409 case Opt_ignore: 410 break; 411 default: 412 return 0; 413 } 414 } 415 sbi->s_mount_opt |= kind; 416 return 1; 417 } 418 419 static int ext2_setup_super (struct super_block * sb, 420 struct ext2_super_block * es, 421 int read_only) 422 { 423 int res = 0; 424 struct ext2_sb_info *sbi = EXT2_SB(sb); 425 426 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { 427 printk ("EXT2-fs warning: revision level too high, " 428 "forcing read-only mode\n"); 429 res = MS_RDONLY; 430 } 431 if (read_only) 432 return res; 433 if (!(sbi->s_mount_state & EXT2_VALID_FS)) 434 printk ("EXT2-fs warning: mounting unchecked fs, " 435 "running e2fsck is recommended\n"); 436 else if ((sbi->s_mount_state & EXT2_ERROR_FS)) 437 printk ("EXT2-fs warning: mounting fs with errors, " 438 "running e2fsck is recommended\n"); 439 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 440 le16_to_cpu(es->s_mnt_count) >= 441 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 442 printk ("EXT2-fs warning: maximal mount count reached, " 443 "running e2fsck is recommended\n"); 444 else if (le32_to_cpu(es->s_checkinterval) && 445 (le32_to_cpu(es->s_lastcheck) + le32_to_cpu(es->s_checkinterval) <= get_seconds())) 446 printk ("EXT2-fs warning: checktime reached, " 447 "running e2fsck is recommended\n"); 448 if (!le16_to_cpu(es->s_max_mnt_count)) 449 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); 450 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1); 451 ext2_write_super(sb); 452 if (test_opt (sb, DEBUG)) 453 printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, " 454 "bpg=%lu, ipg=%lu, mo=%04lx]\n", 455 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, 456 sbi->s_frag_size, 457 sbi->s_groups_count, 458 EXT2_BLOCKS_PER_GROUP(sb), 459 EXT2_INODES_PER_GROUP(sb), 460 sbi->s_mount_opt); 461 #ifdef CONFIG_EXT2_CHECK 462 if (test_opt (sb, CHECK)) { 463 ext2_check_blocks_bitmap (sb); 464 ext2_check_inodes_bitmap (sb); 465 } 466 #endif 467 return res; 468 } 469 470 static int ext2_check_descriptors (struct super_block * sb) 471 { 472 int i; 473 int desc_block = 0; 474 struct ext2_sb_info *sbi = EXT2_SB(sb); 475 unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block); 476 struct ext2_group_desc * gdp = NULL; 477 478 ext2_debug ("Checking group descriptors"); 479 480 for (i = 0; i < sbi->s_groups_count; i++) 481 { 482 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0) 483 gdp = (struct ext2_group_desc *) sbi->s_group_desc[desc_block++]->b_data; 484 if (le32_to_cpu(gdp->bg_block_bitmap) < block || 485 le32_to_cpu(gdp->bg_block_bitmap) >= block + EXT2_BLOCKS_PER_GROUP(sb)) 486 { 487 ext2_error (sb, "ext2_check_descriptors", 488 "Block bitmap for group %d" 489 " not in group (block %lu)!", 490 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); 491 return 0; 492 } 493 if (le32_to_cpu(gdp->bg_inode_bitmap) < block || 494 le32_to_cpu(gdp->bg_inode_bitmap) >= block + EXT2_BLOCKS_PER_GROUP(sb)) 495 { 496 ext2_error (sb, "ext2_check_descriptors", 497 "Inode bitmap for group %d" 498 " not in group (block %lu)!", 499 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); 500 return 0; 501 } 502 if (le32_to_cpu(gdp->bg_inode_table) < block || 503 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >= 504 block + EXT2_BLOCKS_PER_GROUP(sb)) 505 { 506 ext2_error (sb, "ext2_check_descriptors", 507 "Inode table for group %d" 508 " not in group (block %lu)!", 509 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); 510 return 0; 511 } 512 block += EXT2_BLOCKS_PER_GROUP(sb); 513 gdp++; 514 } 515 return 1; 516 } 517 518 #define log2(n) ffz(~(n)) 519 520 /* 521 * Maximal file size. There is a direct, and {,double-,triple-}indirect 522 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. 523 * We need to be 1 filesystem block less than the 2^32 sector limit. 524 */ 525 static loff_t ext2_max_size(int bits) 526 { 527 loff_t res = EXT2_NDIR_BLOCKS; 528 /* This constant is calculated to be the largest file size for a 529 * dense, 4k-blocksize file such that the total number of 530 * sectors in the file, including data and all indirect blocks, 531 * does not exceed 2^32. */ 532 const loff_t upper_limit = 0x1ff7fffd000LL; 533 534 res += 1LL << (bits-2); 535 res += 1LL << (2*(bits-2)); 536 res += 1LL << (3*(bits-2)); 537 res <<= bits; 538 if (res > upper_limit) 539 res = upper_limit; 540 return res; 541 } 542 543 static unsigned long descriptor_loc(struct super_block *sb, 544 unsigned long logic_sb_block, 545 int nr) 546 { 547 struct ext2_sb_info *sbi = EXT2_SB(sb); 548 unsigned long bg, first_data_block, first_meta_bg; 549 int has_super = 0; 550 551 first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block); 552 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 553 554 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || 555 nr < first_meta_bg) 556 return (logic_sb_block + nr + 1); 557 bg = sbi->s_desc_per_block * nr; 558 if (ext2_bg_has_super(sb, bg)) 559 has_super = 1; 560 return (first_data_block + has_super + (bg * sbi->s_blocks_per_group)); 561 } 562 563 static int ext2_fill_super(struct super_block *sb, void *data, int silent) 564 { 565 struct buffer_head * bh; 566 struct ext2_sb_info * sbi; 567 struct ext2_super_block * es; 568 struct inode *root; 569 unsigned long block; 570 unsigned long sb_block = get_sb_block(&data); 571 unsigned long logic_sb_block; 572 unsigned long offset = 0; 573 unsigned long def_mount_opts; 574 int blocksize = BLOCK_SIZE; 575 int db_count; 576 int i, j; 577 __le32 features; 578 579 sbi = kmalloc(sizeof(*sbi), GFP_KERNEL); 580 if (!sbi) 581 return -ENOMEM; 582 sb->s_fs_info = sbi; 583 memset(sbi, 0, sizeof(*sbi)); 584 585 /* 586 * See what the current blocksize for the device is, and 587 * use that as the blocksize. Otherwise (or if the blocksize 588 * is smaller than the default) use the default. 589 * This is important for devices that have a hardware 590 * sectorsize that is larger than the default. 591 */ 592 blocksize = sb_min_blocksize(sb, BLOCK_SIZE); 593 if (!blocksize) { 594 printk ("EXT2-fs: unable to set blocksize\n"); 595 goto failed_sbi; 596 } 597 598 /* 599 * If the superblock doesn't start on a hardware sector boundary, 600 * calculate the offset. 601 */ 602 if (blocksize != BLOCK_SIZE) { 603 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 604 offset = (sb_block*BLOCK_SIZE) % blocksize; 605 } else { 606 logic_sb_block = sb_block; 607 } 608 609 if (!(bh = sb_bread(sb, logic_sb_block))) { 610 printk ("EXT2-fs: unable to read superblock\n"); 611 goto failed_sbi; 612 } 613 /* 614 * Note: s_es must be initialized as soon as possible because 615 * some ext2 macro-instructions depend on its value 616 */ 617 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 618 sbi->s_es = es; 619 sb->s_magic = le16_to_cpu(es->s_magic); 620 621 if (sb->s_magic != EXT2_SUPER_MAGIC) 622 goto cantfind_ext2; 623 624 /* Set defaults before we parse the mount options */ 625 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 626 if (def_mount_opts & EXT2_DEFM_DEBUG) 627 set_opt(sbi->s_mount_opt, DEBUG); 628 if (def_mount_opts & EXT2_DEFM_BSDGROUPS) 629 set_opt(sbi->s_mount_opt, GRPID); 630 if (def_mount_opts & EXT2_DEFM_UID16) 631 set_opt(sbi->s_mount_opt, NO_UID32); 632 if (def_mount_opts & EXT2_DEFM_XATTR_USER) 633 set_opt(sbi->s_mount_opt, XATTR_USER); 634 if (def_mount_opts & EXT2_DEFM_ACL) 635 set_opt(sbi->s_mount_opt, POSIX_ACL); 636 637 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) 638 set_opt(sbi->s_mount_opt, ERRORS_PANIC); 639 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_RO) 640 set_opt(sbi->s_mount_opt, ERRORS_RO); 641 642 sbi->s_resuid = le16_to_cpu(es->s_def_resuid); 643 sbi->s_resgid = le16_to_cpu(es->s_def_resgid); 644 645 if (!parse_options ((char *) data, sbi)) 646 goto failed_mount; 647 648 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 649 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? 650 MS_POSIXACL : 0); 651 652 ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset 653 EXT2_MOUNT_XIP if not */ 654 655 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && 656 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || 657 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 658 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) 659 printk("EXT2-fs warning: feature flags set on rev 0 fs, " 660 "running e2fsck is recommended\n"); 661 /* 662 * Check feature flags regardless of the revision level, since we 663 * previously didn't change the revision level when setting the flags, 664 * so there is a chance incompat flags are set on a rev 0 filesystem. 665 */ 666 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); 667 if (features) { 668 printk("EXT2-fs: %s: couldn't mount because of " 669 "unsupported optional features (%x).\n", 670 sb->s_id, le32_to_cpu(features)); 671 goto failed_mount; 672 } 673 if (!(sb->s_flags & MS_RDONLY) && 674 (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ 675 printk("EXT2-fs: %s: couldn't mount RDWR because of " 676 "unsupported optional features (%x).\n", 677 sb->s_id, le32_to_cpu(features)); 678 goto failed_mount; 679 } 680 681 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); 682 683 if ((ext2_use_xip(sb)) && ((blocksize != PAGE_SIZE) || 684 (sb->s_blocksize != blocksize))) { 685 if (!silent) 686 printk("XIP: Unsupported blocksize\n"); 687 goto failed_mount; 688 } 689 690 /* If the blocksize doesn't match, re-read the thing.. */ 691 if (sb->s_blocksize != blocksize) { 692 brelse(bh); 693 694 if (!sb_set_blocksize(sb, blocksize)) { 695 printk(KERN_ERR "EXT2-fs: blocksize too small for device.\n"); 696 goto failed_sbi; 697 } 698 699 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 700 offset = (sb_block*BLOCK_SIZE) % blocksize; 701 bh = sb_bread(sb, logic_sb_block); 702 if(!bh) { 703 printk("EXT2-fs: Couldn't read superblock on " 704 "2nd try.\n"); 705 goto failed_sbi; 706 } 707 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 708 sbi->s_es = es; 709 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { 710 printk ("EXT2-fs: Magic mismatch, very weird !\n"); 711 goto failed_mount; 712 } 713 } 714 715 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); 716 717 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { 718 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; 719 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; 720 } else { 721 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 722 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 723 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || 724 (sbi->s_inode_size & (sbi->s_inode_size - 1)) || 725 (sbi->s_inode_size > blocksize)) { 726 printk ("EXT2-fs: unsupported inode size: %d\n", 727 sbi->s_inode_size); 728 goto failed_mount; 729 } 730 } 731 732 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << 733 le32_to_cpu(es->s_log_frag_size); 734 if (sbi->s_frag_size == 0) 735 goto cantfind_ext2; 736 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; 737 738 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 739 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); 740 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 741 742 if (EXT2_INODE_SIZE(sb) == 0) 743 goto cantfind_ext2; 744 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); 745 if (sbi->s_inodes_per_block == 0) 746 goto cantfind_ext2; 747 sbi->s_itb_per_group = sbi->s_inodes_per_group / 748 sbi->s_inodes_per_block; 749 sbi->s_desc_per_block = sb->s_blocksize / 750 sizeof (struct ext2_group_desc); 751 sbi->s_sbh = bh; 752 sbi->s_mount_state = le16_to_cpu(es->s_state); 753 sbi->s_addr_per_block_bits = 754 log2 (EXT2_ADDR_PER_BLOCK(sb)); 755 sbi->s_desc_per_block_bits = 756 log2 (EXT2_DESC_PER_BLOCK(sb)); 757 758 if (sb->s_magic != EXT2_SUPER_MAGIC) 759 goto cantfind_ext2; 760 761 if (sb->s_blocksize != bh->b_size) { 762 if (!silent) 763 printk ("VFS: Unsupported blocksize on dev " 764 "%s.\n", sb->s_id); 765 goto failed_mount; 766 } 767 768 if (sb->s_blocksize != sbi->s_frag_size) { 769 printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n", 770 sbi->s_frag_size, sb->s_blocksize); 771 goto failed_mount; 772 } 773 774 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { 775 printk ("EXT2-fs: #blocks per group too big: %lu\n", 776 sbi->s_blocks_per_group); 777 goto failed_mount; 778 } 779 if (sbi->s_frags_per_group > sb->s_blocksize * 8) { 780 printk ("EXT2-fs: #fragments per group too big: %lu\n", 781 sbi->s_frags_per_group); 782 goto failed_mount; 783 } 784 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { 785 printk ("EXT2-fs: #inodes per group too big: %lu\n", 786 sbi->s_inodes_per_group); 787 goto failed_mount; 788 } 789 790 if (EXT2_BLOCKS_PER_GROUP(sb) == 0) 791 goto cantfind_ext2; 792 sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) - 793 le32_to_cpu(es->s_first_data_block) + 794 EXT2_BLOCKS_PER_GROUP(sb) - 1) / 795 EXT2_BLOCKS_PER_GROUP(sb); 796 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / 797 EXT2_DESC_PER_BLOCK(sb); 798 sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL); 799 if (sbi->s_group_desc == NULL) { 800 printk ("EXT2-fs: not enough memory\n"); 801 goto failed_mount; 802 } 803 percpu_counter_init(&sbi->s_freeblocks_counter); 804 percpu_counter_init(&sbi->s_freeinodes_counter); 805 percpu_counter_init(&sbi->s_dirs_counter); 806 bgl_lock_init(&sbi->s_blockgroup_lock); 807 sbi->s_debts = kmalloc(sbi->s_groups_count * sizeof(*sbi->s_debts), 808 GFP_KERNEL); 809 if (!sbi->s_debts) { 810 printk ("EXT2-fs: not enough memory\n"); 811 goto failed_mount_group_desc; 812 } 813 memset(sbi->s_debts, 0, sbi->s_groups_count * sizeof(*sbi->s_debts)); 814 for (i = 0; i < db_count; i++) { 815 block = descriptor_loc(sb, logic_sb_block, i); 816 sbi->s_group_desc[i] = sb_bread(sb, block); 817 if (!sbi->s_group_desc[i]) { 818 for (j = 0; j < i; j++) 819 brelse (sbi->s_group_desc[j]); 820 printk ("EXT2-fs: unable to read group descriptors\n"); 821 goto failed_mount_group_desc; 822 } 823 } 824 if (!ext2_check_descriptors (sb)) { 825 printk ("EXT2-fs: group descriptors corrupted!\n"); 826 db_count = i; 827 goto failed_mount2; 828 } 829 sbi->s_gdb_count = db_count; 830 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 831 spin_lock_init(&sbi->s_next_gen_lock); 832 /* 833 * set up enough so that it can read an inode 834 */ 835 sb->s_op = &ext2_sops; 836 sb->s_export_op = &ext2_export_ops; 837 sb->s_xattr = ext2_xattr_handlers; 838 root = iget(sb, EXT2_ROOT_INO); 839 sb->s_root = d_alloc_root(root); 840 if (!sb->s_root) { 841 iput(root); 842 printk(KERN_ERR "EXT2-fs: get root inode failed\n"); 843 goto failed_mount2; 844 } 845 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 846 dput(sb->s_root); 847 sb->s_root = NULL; 848 printk(KERN_ERR "EXT2-fs: corrupt root inode, run e2fsck\n"); 849 goto failed_mount2; 850 } 851 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 852 ext2_warning(sb, __FUNCTION__, 853 "mounting ext3 filesystem as ext2\n"); 854 ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY); 855 percpu_counter_mod(&sbi->s_freeblocks_counter, 856 ext2_count_free_blocks(sb)); 857 percpu_counter_mod(&sbi->s_freeinodes_counter, 858 ext2_count_free_inodes(sb)); 859 percpu_counter_mod(&sbi->s_dirs_counter, 860 ext2_count_dirs(sb)); 861 return 0; 862 863 cantfind_ext2: 864 if (!silent) 865 printk("VFS: Can't find an ext2 filesystem on dev %s.\n", 866 sb->s_id); 867 goto failed_mount; 868 869 failed_mount2: 870 for (i = 0; i < db_count; i++) 871 brelse(sbi->s_group_desc[i]); 872 failed_mount_group_desc: 873 kfree(sbi->s_group_desc); 874 kfree(sbi->s_debts); 875 failed_mount: 876 brelse(bh); 877 failed_sbi: 878 sb->s_fs_info = NULL; 879 kfree(sbi); 880 return -EINVAL; 881 } 882 883 static void ext2_commit_super (struct super_block * sb, 884 struct ext2_super_block * es) 885 { 886 es->s_wtime = cpu_to_le32(get_seconds()); 887 mark_buffer_dirty(EXT2_SB(sb)->s_sbh); 888 sb->s_dirt = 0; 889 } 890 891 static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es) 892 { 893 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); 894 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); 895 es->s_wtime = cpu_to_le32(get_seconds()); 896 mark_buffer_dirty(EXT2_SB(sb)->s_sbh); 897 sync_dirty_buffer(EXT2_SB(sb)->s_sbh); 898 sb->s_dirt = 0; 899 } 900 901 /* 902 * In the second extended file system, it is not necessary to 903 * write the super block since we use a mapping of the 904 * disk super block in a buffer. 905 * 906 * However, this function is still used to set the fs valid 907 * flags to 0. We need to set this flag to 0 since the fs 908 * may have been checked while mounted and e2fsck may have 909 * set s_state to EXT2_VALID_FS after some corrections. 910 */ 911 912 void ext2_write_super (struct super_block * sb) 913 { 914 struct ext2_super_block * es; 915 lock_kernel(); 916 if (!(sb->s_flags & MS_RDONLY)) { 917 es = EXT2_SB(sb)->s_es; 918 919 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS) { 920 ext2_debug ("setting valid to 0\n"); 921 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & 922 ~EXT2_VALID_FS); 923 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); 924 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); 925 es->s_mtime = cpu_to_le32(get_seconds()); 926 ext2_sync_super(sb, es); 927 } else 928 ext2_commit_super (sb, es); 929 } 930 sb->s_dirt = 0; 931 unlock_kernel(); 932 } 933 934 static int ext2_remount (struct super_block * sb, int * flags, char * data) 935 { 936 struct ext2_sb_info * sbi = EXT2_SB(sb); 937 struct ext2_super_block * es; 938 unsigned long old_mount_opt = sbi->s_mount_opt; 939 struct ext2_mount_options old_opts; 940 unsigned long old_sb_flags; 941 int err; 942 943 /* Store the old options */ 944 old_sb_flags = sb->s_flags; 945 old_opts.s_mount_opt = sbi->s_mount_opt; 946 old_opts.s_resuid = sbi->s_resuid; 947 old_opts.s_resgid = sbi->s_resgid; 948 949 /* 950 * Allow the "check" option to be passed as a remount option. 951 */ 952 if (!parse_options (data, sbi)) { 953 err = -EINVAL; 954 goto restore_opts; 955 } 956 957 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 958 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 959 960 es = sbi->s_es; 961 if (((sbi->s_mount_opt & EXT2_MOUNT_XIP) != 962 (old_mount_opt & EXT2_MOUNT_XIP)) && 963 invalidate_inodes(sb)) 964 ext2_warning(sb, __FUNCTION__, "busy inodes while remounting "\ 965 "xip remain in cache (no functional problem)"); 966 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 967 return 0; 968 if (*flags & MS_RDONLY) { 969 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || 970 !(sbi->s_mount_state & EXT2_VALID_FS)) 971 return 0; 972 /* 973 * OK, we are remounting a valid rw partition rdonly, so set 974 * the rdonly flag and then mark the partition as valid again. 975 */ 976 es->s_state = cpu_to_le16(sbi->s_mount_state); 977 es->s_mtime = cpu_to_le32(get_seconds()); 978 } else { 979 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, 980 ~EXT2_FEATURE_RO_COMPAT_SUPP); 981 if (ret) { 982 printk("EXT2-fs: %s: couldn't remount RDWR because of " 983 "unsupported optional features (%x).\n", 984 sb->s_id, le32_to_cpu(ret)); 985 err = -EROFS; 986 goto restore_opts; 987 } 988 /* 989 * Mounting a RDONLY partition read-write, so reread and 990 * store the current valid flag. (It may have been changed 991 * by e2fsck since we originally mounted the partition.) 992 */ 993 sbi->s_mount_state = le16_to_cpu(es->s_state); 994 if (!ext2_setup_super (sb, es, 0)) 995 sb->s_flags &= ~MS_RDONLY; 996 } 997 ext2_sync_super(sb, es); 998 return 0; 999 restore_opts: 1000 sbi->s_mount_opt = old_opts.s_mount_opt; 1001 sbi->s_resuid = old_opts.s_resuid; 1002 sbi->s_resgid = old_opts.s_resgid; 1003 sb->s_flags = old_sb_flags; 1004 return err; 1005 } 1006 1007 static int ext2_statfs (struct super_block * sb, struct kstatfs * buf) 1008 { 1009 struct ext2_sb_info *sbi = EXT2_SB(sb); 1010 unsigned long overhead; 1011 int i; 1012 1013 if (test_opt (sb, MINIX_DF)) 1014 overhead = 0; 1015 else { 1016 /* 1017 * Compute the overhead (FS structures) 1018 */ 1019 1020 /* 1021 * All of the blocks before first_data_block are 1022 * overhead 1023 */ 1024 overhead = le32_to_cpu(sbi->s_es->s_first_data_block); 1025 1026 /* 1027 * Add the overhead attributed to the superblock and 1028 * block group descriptors. If the sparse superblocks 1029 * feature is turned on, then not all groups have this. 1030 */ 1031 for (i = 0; i < sbi->s_groups_count; i++) 1032 overhead += ext2_bg_has_super(sb, i) + 1033 ext2_bg_num_gdb(sb, i); 1034 1035 /* 1036 * Every block group has an inode bitmap, a block 1037 * bitmap, and an inode table. 1038 */ 1039 overhead += (sbi->s_groups_count * 1040 (2 + sbi->s_itb_per_group)); 1041 } 1042 1043 buf->f_type = EXT2_SUPER_MAGIC; 1044 buf->f_bsize = sb->s_blocksize; 1045 buf->f_blocks = le32_to_cpu(sbi->s_es->s_blocks_count) - overhead; 1046 buf->f_bfree = ext2_count_free_blocks(sb); 1047 buf->f_bavail = buf->f_bfree - le32_to_cpu(sbi->s_es->s_r_blocks_count); 1048 if (buf->f_bfree < le32_to_cpu(sbi->s_es->s_r_blocks_count)) 1049 buf->f_bavail = 0; 1050 buf->f_files = le32_to_cpu(sbi->s_es->s_inodes_count); 1051 buf->f_ffree = ext2_count_free_inodes (sb); 1052 buf->f_namelen = EXT2_NAME_LEN; 1053 return 0; 1054 } 1055 1056 static struct super_block *ext2_get_sb(struct file_system_type *fs_type, 1057 int flags, const char *dev_name, void *data) 1058 { 1059 return get_sb_bdev(fs_type, flags, dev_name, data, ext2_fill_super); 1060 } 1061 1062 #ifdef CONFIG_QUOTA 1063 1064 /* Read data from quotafile - avoid pagecache and such because we cannot afford 1065 * acquiring the locks... As quota files are never truncated and quota code 1066 * itself serializes the operations (and noone else should touch the files) 1067 * we don't have to be afraid of races */ 1068 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, 1069 size_t len, loff_t off) 1070 { 1071 struct inode *inode = sb_dqopt(sb)->files[type]; 1072 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1073 int err = 0; 1074 int offset = off & (sb->s_blocksize - 1); 1075 int tocopy; 1076 size_t toread; 1077 struct buffer_head tmp_bh; 1078 struct buffer_head *bh; 1079 loff_t i_size = i_size_read(inode); 1080 1081 if (off > i_size) 1082 return 0; 1083 if (off+len > i_size) 1084 len = i_size-off; 1085 toread = len; 1086 while (toread > 0) { 1087 tocopy = sb->s_blocksize - offset < toread ? 1088 sb->s_blocksize - offset : toread; 1089 1090 tmp_bh.b_state = 0; 1091 err = ext2_get_block(inode, blk, &tmp_bh, 0); 1092 if (err) 1093 return err; 1094 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 1095 memset(data, 0, tocopy); 1096 else { 1097 bh = sb_bread(sb, tmp_bh.b_blocknr); 1098 if (!bh) 1099 return -EIO; 1100 memcpy(data, bh->b_data+offset, tocopy); 1101 brelse(bh); 1102 } 1103 offset = 0; 1104 toread -= tocopy; 1105 data += tocopy; 1106 blk++; 1107 } 1108 return len; 1109 } 1110 1111 /* Write to quotafile */ 1112 static ssize_t ext2_quota_write(struct super_block *sb, int type, 1113 const char *data, size_t len, loff_t off) 1114 { 1115 struct inode *inode = sb_dqopt(sb)->files[type]; 1116 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1117 int err = 0; 1118 int offset = off & (sb->s_blocksize - 1); 1119 int tocopy; 1120 size_t towrite = len; 1121 struct buffer_head tmp_bh; 1122 struct buffer_head *bh; 1123 1124 down(&inode->i_sem); 1125 while (towrite > 0) { 1126 tocopy = sb->s_blocksize - offset < towrite ? 1127 sb->s_blocksize - offset : towrite; 1128 1129 tmp_bh.b_state = 0; 1130 err = ext2_get_block(inode, blk, &tmp_bh, 1); 1131 if (err) 1132 goto out; 1133 if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) 1134 bh = sb_bread(sb, tmp_bh.b_blocknr); 1135 else 1136 bh = sb_getblk(sb, tmp_bh.b_blocknr); 1137 if (!bh) { 1138 err = -EIO; 1139 goto out; 1140 } 1141 lock_buffer(bh); 1142 memcpy(bh->b_data+offset, data, tocopy); 1143 flush_dcache_page(bh->b_page); 1144 set_buffer_uptodate(bh); 1145 mark_buffer_dirty(bh); 1146 unlock_buffer(bh); 1147 brelse(bh); 1148 offset = 0; 1149 towrite -= tocopy; 1150 data += tocopy; 1151 blk++; 1152 } 1153 out: 1154 if (len == towrite) 1155 return err; 1156 if (inode->i_size < off+len-towrite) 1157 i_size_write(inode, off+len-towrite); 1158 inode->i_version++; 1159 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 1160 mark_inode_dirty(inode); 1161 up(&inode->i_sem); 1162 return len - towrite; 1163 } 1164 1165 #endif 1166 1167 static struct file_system_type ext2_fs_type = { 1168 .owner = THIS_MODULE, 1169 .name = "ext2", 1170 .get_sb = ext2_get_sb, 1171 .kill_sb = kill_block_super, 1172 .fs_flags = FS_REQUIRES_DEV, 1173 }; 1174 1175 static int __init init_ext2_fs(void) 1176 { 1177 int err = init_ext2_xattr(); 1178 if (err) 1179 return err; 1180 err = init_inodecache(); 1181 if (err) 1182 goto out1; 1183 err = register_filesystem(&ext2_fs_type); 1184 if (err) 1185 goto out; 1186 return 0; 1187 out: 1188 destroy_inodecache(); 1189 out1: 1190 exit_ext2_xattr(); 1191 return err; 1192 } 1193 1194 static void __exit exit_ext2_fs(void) 1195 { 1196 unregister_filesystem(&ext2_fs_type); 1197 destroy_inodecache(); 1198 exit_ext2_xattr(); 1199 } 1200 1201 module_init(init_ext2_fs) 1202 module_exit(exit_ext2_fs) 1203