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/smp_lock.h> 29 #include <linux/vfs.h> 30 #include <linux/seq_file.h> 31 #include <linux/mount.h> 32 #include <asm/uaccess.h> 33 #include "ext2.h" 34 #include "xattr.h" 35 #include "acl.h" 36 #include "xip.h" 37 38 static void ext2_sync_super(struct super_block *sb, 39 struct ext2_super_block *es); 40 static int ext2_remount (struct super_block * sb, int * flags, char * data); 41 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf); 42 43 void ext2_error (struct super_block * sb, const char * function, 44 const char * fmt, ...) 45 { 46 va_list args; 47 struct ext2_sb_info *sbi = EXT2_SB(sb); 48 struct ext2_super_block *es = sbi->s_es; 49 50 if (!(sb->s_flags & MS_RDONLY)) { 51 sbi->s_mount_state |= EXT2_ERROR_FS; 52 es->s_state = 53 cpu_to_le16(le16_to_cpu(es->s_state) | EXT2_ERROR_FS); 54 ext2_sync_super(sb, es); 55 } 56 57 va_start(args, fmt); 58 printk(KERN_CRIT "EXT2-fs error (device %s): %s: ",sb->s_id, function); 59 vprintk(fmt, args); 60 printk("\n"); 61 va_end(args); 62 63 if (test_opt(sb, ERRORS_PANIC)) 64 panic("EXT2-fs panic from previous error\n"); 65 if (test_opt(sb, ERRORS_RO)) { 66 printk("Remounting filesystem read-only\n"); 67 sb->s_flags |= MS_RDONLY; 68 } 69 } 70 71 void ext2_warning (struct super_block * sb, const char * function, 72 const char * fmt, ...) 73 { 74 va_list args; 75 76 va_start(args, fmt); 77 printk(KERN_WARNING "EXT2-fs warning (device %s): %s: ", 78 sb->s_id, function); 79 vprintk(fmt, args); 80 printk("\n"); 81 va_end(args); 82 } 83 84 void ext2_update_dynamic_rev(struct super_block *sb) 85 { 86 struct ext2_super_block *es = EXT2_SB(sb)->s_es; 87 88 if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV) 89 return; 90 91 ext2_warning(sb, __FUNCTION__, 92 "updating to rev %d because of new feature flag, " 93 "running e2fsck is recommended", 94 EXT2_DYNAMIC_REV); 95 96 es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO); 97 es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE); 98 es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV); 99 /* leave es->s_feature_*compat flags alone */ 100 /* es->s_uuid will be set by e2fsck if empty */ 101 102 /* 103 * The rest of the superblock fields should be zero, and if not it 104 * means they are likely already in use, so leave them alone. We 105 * can leave it up to e2fsck to clean up any inconsistencies there. 106 */ 107 } 108 109 static void ext2_put_super (struct super_block * sb) 110 { 111 int db_count; 112 int i; 113 struct ext2_sb_info *sbi = EXT2_SB(sb); 114 115 ext2_xattr_put_super(sb); 116 if (!(sb->s_flags & MS_RDONLY)) { 117 struct ext2_super_block *es = sbi->s_es; 118 119 es->s_state = cpu_to_le16(sbi->s_mount_state); 120 ext2_sync_super(sb, es); 121 } 122 db_count = sbi->s_gdb_count; 123 for (i = 0; i < db_count; i++) 124 if (sbi->s_group_desc[i]) 125 brelse (sbi->s_group_desc[i]); 126 kfree(sbi->s_group_desc); 127 kfree(sbi->s_debts); 128 percpu_counter_destroy(&sbi->s_freeblocks_counter); 129 percpu_counter_destroy(&sbi->s_freeinodes_counter); 130 percpu_counter_destroy(&sbi->s_dirs_counter); 131 brelse (sbi->s_sbh); 132 sb->s_fs_info = NULL; 133 kfree(sbi); 134 135 return; 136 } 137 138 static kmem_cache_t * ext2_inode_cachep; 139 140 static struct inode *ext2_alloc_inode(struct super_block *sb) 141 { 142 struct ext2_inode_info *ei; 143 ei = (struct ext2_inode_info *)kmem_cache_alloc(ext2_inode_cachep, SLAB_KERNEL); 144 if (!ei) 145 return NULL; 146 #ifdef CONFIG_EXT2_FS_POSIX_ACL 147 ei->i_acl = EXT2_ACL_NOT_CACHED; 148 ei->i_default_acl = EXT2_ACL_NOT_CACHED; 149 #endif 150 ei->vfs_inode.i_version = 1; 151 return &ei->vfs_inode; 152 } 153 154 static void ext2_destroy_inode(struct inode *inode) 155 { 156 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode)); 157 } 158 159 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) 160 { 161 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo; 162 163 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == 164 SLAB_CTOR_CONSTRUCTOR) { 165 rwlock_init(&ei->i_meta_lock); 166 #ifdef CONFIG_EXT2_FS_XATTR 167 init_rwsem(&ei->xattr_sem); 168 #endif 169 inode_init_once(&ei->vfs_inode); 170 } 171 } 172 173 static int init_inodecache(void) 174 { 175 ext2_inode_cachep = kmem_cache_create("ext2_inode_cache", 176 sizeof(struct ext2_inode_info), 177 0, (SLAB_RECLAIM_ACCOUNT| 178 SLAB_MEM_SPREAD), 179 init_once, NULL); 180 if (ext2_inode_cachep == NULL) 181 return -ENOMEM; 182 return 0; 183 } 184 185 static void destroy_inodecache(void) 186 { 187 if (kmem_cache_destroy(ext2_inode_cachep)) 188 printk(KERN_INFO "ext2_inode_cache: not all structures were freed\n"); 189 } 190 191 static void ext2_clear_inode(struct inode *inode) 192 { 193 #ifdef CONFIG_EXT2_FS_POSIX_ACL 194 struct ext2_inode_info *ei = EXT2_I(inode); 195 196 if (ei->i_acl && ei->i_acl != EXT2_ACL_NOT_CACHED) { 197 posix_acl_release(ei->i_acl); 198 ei->i_acl = EXT2_ACL_NOT_CACHED; 199 } 200 if (ei->i_default_acl && ei->i_default_acl != EXT2_ACL_NOT_CACHED) { 201 posix_acl_release(ei->i_default_acl); 202 ei->i_default_acl = EXT2_ACL_NOT_CACHED; 203 } 204 #endif 205 } 206 207 static int ext2_show_options(struct seq_file *seq, struct vfsmount *vfs) 208 { 209 struct ext2_sb_info *sbi = EXT2_SB(vfs->mnt_sb); 210 211 if (sbi->s_mount_opt & EXT2_MOUNT_GRPID) 212 seq_puts(seq, ",grpid"); 213 214 #if defined(CONFIG_QUOTA) 215 if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA) 216 seq_puts(seq, ",usrquota"); 217 218 if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA) 219 seq_puts(seq, ",grpquota"); 220 #endif 221 222 #if defined(CONFIG_EXT2_FS_XIP) 223 if (sbi->s_mount_opt & EXT2_MOUNT_XIP) 224 seq_puts(seq, ",xip"); 225 #endif 226 227 return 0; 228 } 229 230 #ifdef CONFIG_QUOTA 231 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); 232 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); 233 #endif 234 235 static struct super_operations ext2_sops = { 236 .alloc_inode = ext2_alloc_inode, 237 .destroy_inode = ext2_destroy_inode, 238 .read_inode = ext2_read_inode, 239 .write_inode = ext2_write_inode, 240 .put_inode = ext2_put_inode, 241 .delete_inode = ext2_delete_inode, 242 .put_super = ext2_put_super, 243 .write_super = ext2_write_super, 244 .statfs = ext2_statfs, 245 .remount_fs = ext2_remount, 246 .clear_inode = ext2_clear_inode, 247 .show_options = ext2_show_options, 248 #ifdef CONFIG_QUOTA 249 .quota_read = ext2_quota_read, 250 .quota_write = ext2_quota_write, 251 #endif 252 }; 253 254 /* Yes, most of these are left as NULL!! 255 * A NULL value implies the default, which works with ext2-like file 256 * systems, but can be improved upon. 257 * Currently only get_parent is required. 258 */ 259 static struct export_operations ext2_export_ops = { 260 .get_parent = ext2_get_parent, 261 }; 262 263 static unsigned long get_sb_block(void **data) 264 { 265 unsigned long sb_block; 266 char *options = (char *) *data; 267 268 if (!options || strncmp(options, "sb=", 3) != 0) 269 return 1; /* Default location */ 270 options += 3; 271 sb_block = simple_strtoul(options, &options, 0); 272 if (*options && *options != ',') { 273 printk("EXT2-fs: Invalid sb specification: %s\n", 274 (char *) *data); 275 return 1; 276 } 277 if (*options == ',') 278 options++; 279 *data = (void *) options; 280 return sb_block; 281 } 282 283 enum { 284 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 285 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, 286 Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug, 287 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, 288 Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota, 289 Opt_usrquota, Opt_grpquota 290 }; 291 292 static match_table_t tokens = { 293 {Opt_bsd_df, "bsddf"}, 294 {Opt_minix_df, "minixdf"}, 295 {Opt_grpid, "grpid"}, 296 {Opt_grpid, "bsdgroups"}, 297 {Opt_nogrpid, "nogrpid"}, 298 {Opt_nogrpid, "sysvgroups"}, 299 {Opt_resgid, "resgid=%u"}, 300 {Opt_resuid, "resuid=%u"}, 301 {Opt_sb, "sb=%u"}, 302 {Opt_err_cont, "errors=continue"}, 303 {Opt_err_panic, "errors=panic"}, 304 {Opt_err_ro, "errors=remount-ro"}, 305 {Opt_nouid32, "nouid32"}, 306 {Opt_nocheck, "check=none"}, 307 {Opt_nocheck, "nocheck"}, 308 {Opt_debug, "debug"}, 309 {Opt_oldalloc, "oldalloc"}, 310 {Opt_orlov, "orlov"}, 311 {Opt_nobh, "nobh"}, 312 {Opt_user_xattr, "user_xattr"}, 313 {Opt_nouser_xattr, "nouser_xattr"}, 314 {Opt_acl, "acl"}, 315 {Opt_noacl, "noacl"}, 316 {Opt_xip, "xip"}, 317 {Opt_grpquota, "grpquota"}, 318 {Opt_ignore, "noquota"}, 319 {Opt_quota, "quota"}, 320 {Opt_usrquota, "usrquota"}, 321 {Opt_err, NULL} 322 }; 323 324 static int parse_options (char * options, 325 struct ext2_sb_info *sbi) 326 { 327 char * p; 328 substring_t args[MAX_OPT_ARGS]; 329 unsigned long kind = EXT2_MOUNT_ERRORS_CONT; 330 int option; 331 332 if (!options) 333 return 1; 334 335 while ((p = strsep (&options, ",")) != NULL) { 336 int token; 337 if (!*p) 338 continue; 339 340 token = match_token(p, tokens, args); 341 switch (token) { 342 case Opt_bsd_df: 343 clear_opt (sbi->s_mount_opt, MINIX_DF); 344 break; 345 case Opt_minix_df: 346 set_opt (sbi->s_mount_opt, MINIX_DF); 347 break; 348 case Opt_grpid: 349 set_opt (sbi->s_mount_opt, GRPID); 350 break; 351 case Opt_nogrpid: 352 clear_opt (sbi->s_mount_opt, GRPID); 353 break; 354 case Opt_resuid: 355 if (match_int(&args[0], &option)) 356 return 0; 357 sbi->s_resuid = option; 358 break; 359 case Opt_resgid: 360 if (match_int(&args[0], &option)) 361 return 0; 362 sbi->s_resgid = option; 363 break; 364 case Opt_sb: 365 /* handled by get_sb_block() instead of here */ 366 /* *sb_block = match_int(&args[0]); */ 367 break; 368 case Opt_err_panic: 369 kind = EXT2_MOUNT_ERRORS_PANIC; 370 break; 371 case Opt_err_ro: 372 kind = EXT2_MOUNT_ERRORS_RO; 373 break; 374 case Opt_err_cont: 375 kind = EXT2_MOUNT_ERRORS_CONT; 376 break; 377 case Opt_nouid32: 378 set_opt (sbi->s_mount_opt, NO_UID32); 379 break; 380 case Opt_nocheck: 381 clear_opt (sbi->s_mount_opt, CHECK); 382 break; 383 case Opt_debug: 384 set_opt (sbi->s_mount_opt, DEBUG); 385 break; 386 case Opt_oldalloc: 387 set_opt (sbi->s_mount_opt, OLDALLOC); 388 break; 389 case Opt_orlov: 390 clear_opt (sbi->s_mount_opt, OLDALLOC); 391 break; 392 case Opt_nobh: 393 set_opt (sbi->s_mount_opt, NOBH); 394 break; 395 #ifdef CONFIG_EXT2_FS_XATTR 396 case Opt_user_xattr: 397 set_opt (sbi->s_mount_opt, XATTR_USER); 398 break; 399 case Opt_nouser_xattr: 400 clear_opt (sbi->s_mount_opt, XATTR_USER); 401 break; 402 #else 403 case Opt_user_xattr: 404 case Opt_nouser_xattr: 405 printk("EXT2 (no)user_xattr options not supported\n"); 406 break; 407 #endif 408 #ifdef CONFIG_EXT2_FS_POSIX_ACL 409 case Opt_acl: 410 set_opt(sbi->s_mount_opt, POSIX_ACL); 411 break; 412 case Opt_noacl: 413 clear_opt(sbi->s_mount_opt, POSIX_ACL); 414 break; 415 #else 416 case Opt_acl: 417 case Opt_noacl: 418 printk("EXT2 (no)acl options not supported\n"); 419 break; 420 #endif 421 case Opt_xip: 422 #ifdef CONFIG_EXT2_FS_XIP 423 set_opt (sbi->s_mount_opt, XIP); 424 #else 425 printk("EXT2 xip option not supported\n"); 426 #endif 427 break; 428 429 #if defined(CONFIG_QUOTA) 430 case Opt_quota: 431 case Opt_usrquota: 432 set_opt(sbi->s_mount_opt, USRQUOTA); 433 break; 434 435 case Opt_grpquota: 436 set_opt(sbi->s_mount_opt, GRPQUOTA); 437 break; 438 #else 439 case Opt_quota: 440 case Opt_usrquota: 441 case Opt_grpquota: 442 printk(KERN_ERR 443 "EXT2-fs: quota operations not supported.\n"); 444 445 break; 446 #endif 447 448 case Opt_ignore: 449 break; 450 default: 451 return 0; 452 } 453 } 454 sbi->s_mount_opt |= kind; 455 return 1; 456 } 457 458 static int ext2_setup_super (struct super_block * sb, 459 struct ext2_super_block * es, 460 int read_only) 461 { 462 int res = 0; 463 struct ext2_sb_info *sbi = EXT2_SB(sb); 464 465 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { 466 printk ("EXT2-fs warning: revision level too high, " 467 "forcing read-only mode\n"); 468 res = MS_RDONLY; 469 } 470 if (read_only) 471 return res; 472 if (!(sbi->s_mount_state & EXT2_VALID_FS)) 473 printk ("EXT2-fs warning: mounting unchecked fs, " 474 "running e2fsck is recommended\n"); 475 else if ((sbi->s_mount_state & EXT2_ERROR_FS)) 476 printk ("EXT2-fs warning: mounting fs with errors, " 477 "running e2fsck is recommended\n"); 478 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 479 le16_to_cpu(es->s_mnt_count) >= 480 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 481 printk ("EXT2-fs warning: maximal mount count reached, " 482 "running e2fsck is recommended\n"); 483 else if (le32_to_cpu(es->s_checkinterval) && 484 (le32_to_cpu(es->s_lastcheck) + le32_to_cpu(es->s_checkinterval) <= get_seconds())) 485 printk ("EXT2-fs warning: checktime reached, " 486 "running e2fsck is recommended\n"); 487 if (!le16_to_cpu(es->s_max_mnt_count)) 488 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); 489 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1); 490 ext2_write_super(sb); 491 if (test_opt (sb, DEBUG)) 492 printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, " 493 "bpg=%lu, ipg=%lu, mo=%04lx]\n", 494 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, 495 sbi->s_frag_size, 496 sbi->s_groups_count, 497 EXT2_BLOCKS_PER_GROUP(sb), 498 EXT2_INODES_PER_GROUP(sb), 499 sbi->s_mount_opt); 500 return res; 501 } 502 503 static int ext2_check_descriptors (struct super_block * sb) 504 { 505 int i; 506 int desc_block = 0; 507 struct ext2_sb_info *sbi = EXT2_SB(sb); 508 unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block); 509 struct ext2_group_desc * gdp = NULL; 510 511 ext2_debug ("Checking group descriptors"); 512 513 for (i = 0; i < sbi->s_groups_count; i++) 514 { 515 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0) 516 gdp = (struct ext2_group_desc *) sbi->s_group_desc[desc_block++]->b_data; 517 if (le32_to_cpu(gdp->bg_block_bitmap) < block || 518 le32_to_cpu(gdp->bg_block_bitmap) >= block + EXT2_BLOCKS_PER_GROUP(sb)) 519 { 520 ext2_error (sb, "ext2_check_descriptors", 521 "Block bitmap for group %d" 522 " not in group (block %lu)!", 523 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); 524 return 0; 525 } 526 if (le32_to_cpu(gdp->bg_inode_bitmap) < block || 527 le32_to_cpu(gdp->bg_inode_bitmap) >= block + EXT2_BLOCKS_PER_GROUP(sb)) 528 { 529 ext2_error (sb, "ext2_check_descriptors", 530 "Inode bitmap for group %d" 531 " not in group (block %lu)!", 532 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); 533 return 0; 534 } 535 if (le32_to_cpu(gdp->bg_inode_table) < block || 536 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >= 537 block + EXT2_BLOCKS_PER_GROUP(sb)) 538 { 539 ext2_error (sb, "ext2_check_descriptors", 540 "Inode table for group %d" 541 " not in group (block %lu)!", 542 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); 543 return 0; 544 } 545 block += EXT2_BLOCKS_PER_GROUP(sb); 546 gdp++; 547 } 548 return 1; 549 } 550 551 #define log2(n) ffz(~(n)) 552 553 /* 554 * Maximal file size. There is a direct, and {,double-,triple-}indirect 555 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. 556 * We need to be 1 filesystem block less than the 2^32 sector limit. 557 */ 558 static loff_t ext2_max_size(int bits) 559 { 560 loff_t res = EXT2_NDIR_BLOCKS; 561 /* This constant is calculated to be the largest file size for a 562 * dense, 4k-blocksize file such that the total number of 563 * sectors in the file, including data and all indirect blocks, 564 * does not exceed 2^32. */ 565 const loff_t upper_limit = 0x1ff7fffd000LL; 566 567 res += 1LL << (bits-2); 568 res += 1LL << (2*(bits-2)); 569 res += 1LL << (3*(bits-2)); 570 res <<= bits; 571 if (res > upper_limit) 572 res = upper_limit; 573 return res; 574 } 575 576 static unsigned long descriptor_loc(struct super_block *sb, 577 unsigned long logic_sb_block, 578 int nr) 579 { 580 struct ext2_sb_info *sbi = EXT2_SB(sb); 581 unsigned long bg, first_data_block, first_meta_bg; 582 int has_super = 0; 583 584 first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block); 585 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 586 587 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || 588 nr < first_meta_bg) 589 return (logic_sb_block + nr + 1); 590 bg = sbi->s_desc_per_block * nr; 591 if (ext2_bg_has_super(sb, bg)) 592 has_super = 1; 593 return (first_data_block + has_super + (bg * sbi->s_blocks_per_group)); 594 } 595 596 static int ext2_fill_super(struct super_block *sb, void *data, int silent) 597 { 598 struct buffer_head * bh; 599 struct ext2_sb_info * sbi; 600 struct ext2_super_block * es; 601 struct inode *root; 602 unsigned long block; 603 unsigned long sb_block = get_sb_block(&data); 604 unsigned long logic_sb_block; 605 unsigned long offset = 0; 606 unsigned long def_mount_opts; 607 int blocksize = BLOCK_SIZE; 608 int db_count; 609 int i, j; 610 __le32 features; 611 612 sbi = kmalloc(sizeof(*sbi), GFP_KERNEL); 613 if (!sbi) 614 return -ENOMEM; 615 sb->s_fs_info = sbi; 616 memset(sbi, 0, sizeof(*sbi)); 617 618 /* 619 * See what the current blocksize for the device is, and 620 * use that as the blocksize. Otherwise (or if the blocksize 621 * is smaller than the default) use the default. 622 * This is important for devices that have a hardware 623 * sectorsize that is larger than the default. 624 */ 625 blocksize = sb_min_blocksize(sb, BLOCK_SIZE); 626 if (!blocksize) { 627 printk ("EXT2-fs: unable to set blocksize\n"); 628 goto failed_sbi; 629 } 630 631 /* 632 * If the superblock doesn't start on a hardware sector boundary, 633 * calculate the offset. 634 */ 635 if (blocksize != BLOCK_SIZE) { 636 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 637 offset = (sb_block*BLOCK_SIZE) % blocksize; 638 } else { 639 logic_sb_block = sb_block; 640 } 641 642 if (!(bh = sb_bread(sb, logic_sb_block))) { 643 printk ("EXT2-fs: unable to read superblock\n"); 644 goto failed_sbi; 645 } 646 /* 647 * Note: s_es must be initialized as soon as possible because 648 * some ext2 macro-instructions depend on its value 649 */ 650 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 651 sbi->s_es = es; 652 sb->s_magic = le16_to_cpu(es->s_magic); 653 654 if (sb->s_magic != EXT2_SUPER_MAGIC) 655 goto cantfind_ext2; 656 657 /* Set defaults before we parse the mount options */ 658 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 659 if (def_mount_opts & EXT2_DEFM_DEBUG) 660 set_opt(sbi->s_mount_opt, DEBUG); 661 if (def_mount_opts & EXT2_DEFM_BSDGROUPS) 662 set_opt(sbi->s_mount_opt, GRPID); 663 if (def_mount_opts & EXT2_DEFM_UID16) 664 set_opt(sbi->s_mount_opt, NO_UID32); 665 if (def_mount_opts & EXT2_DEFM_XATTR_USER) 666 set_opt(sbi->s_mount_opt, XATTR_USER); 667 if (def_mount_opts & EXT2_DEFM_ACL) 668 set_opt(sbi->s_mount_opt, POSIX_ACL); 669 670 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) 671 set_opt(sbi->s_mount_opt, ERRORS_PANIC); 672 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_RO) 673 set_opt(sbi->s_mount_opt, ERRORS_RO); 674 675 sbi->s_resuid = le16_to_cpu(es->s_def_resuid); 676 sbi->s_resgid = le16_to_cpu(es->s_def_resgid); 677 678 if (!parse_options ((char *) data, sbi)) 679 goto failed_mount; 680 681 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 682 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? 683 MS_POSIXACL : 0); 684 685 ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset 686 EXT2_MOUNT_XIP if not */ 687 688 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && 689 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || 690 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 691 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) 692 printk("EXT2-fs warning: feature flags set on rev 0 fs, " 693 "running e2fsck is recommended\n"); 694 /* 695 * Check feature flags regardless of the revision level, since we 696 * previously didn't change the revision level when setting the flags, 697 * so there is a chance incompat flags are set on a rev 0 filesystem. 698 */ 699 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); 700 if (features) { 701 printk("EXT2-fs: %s: couldn't mount because of " 702 "unsupported optional features (%x).\n", 703 sb->s_id, le32_to_cpu(features)); 704 goto failed_mount; 705 } 706 if (!(sb->s_flags & MS_RDONLY) && 707 (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ 708 printk("EXT2-fs: %s: couldn't mount RDWR because of " 709 "unsupported optional features (%x).\n", 710 sb->s_id, le32_to_cpu(features)); 711 goto failed_mount; 712 } 713 714 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); 715 716 if ((ext2_use_xip(sb)) && ((blocksize != PAGE_SIZE) || 717 (sb->s_blocksize != blocksize))) { 718 if (!silent) 719 printk("XIP: Unsupported blocksize\n"); 720 goto failed_mount; 721 } 722 723 /* If the blocksize doesn't match, re-read the thing.. */ 724 if (sb->s_blocksize != blocksize) { 725 brelse(bh); 726 727 if (!sb_set_blocksize(sb, blocksize)) { 728 printk(KERN_ERR "EXT2-fs: blocksize too small for device.\n"); 729 goto failed_sbi; 730 } 731 732 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 733 offset = (sb_block*BLOCK_SIZE) % blocksize; 734 bh = sb_bread(sb, logic_sb_block); 735 if(!bh) { 736 printk("EXT2-fs: Couldn't read superblock on " 737 "2nd try.\n"); 738 goto failed_sbi; 739 } 740 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 741 sbi->s_es = es; 742 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { 743 printk ("EXT2-fs: Magic mismatch, very weird !\n"); 744 goto failed_mount; 745 } 746 } 747 748 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); 749 750 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { 751 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; 752 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; 753 } else { 754 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 755 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 756 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || 757 (sbi->s_inode_size & (sbi->s_inode_size - 1)) || 758 (sbi->s_inode_size > blocksize)) { 759 printk ("EXT2-fs: unsupported inode size: %d\n", 760 sbi->s_inode_size); 761 goto failed_mount; 762 } 763 } 764 765 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << 766 le32_to_cpu(es->s_log_frag_size); 767 if (sbi->s_frag_size == 0) 768 goto cantfind_ext2; 769 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; 770 771 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 772 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); 773 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 774 775 if (EXT2_INODE_SIZE(sb) == 0) 776 goto cantfind_ext2; 777 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); 778 if (sbi->s_inodes_per_block == 0) 779 goto cantfind_ext2; 780 sbi->s_itb_per_group = sbi->s_inodes_per_group / 781 sbi->s_inodes_per_block; 782 sbi->s_desc_per_block = sb->s_blocksize / 783 sizeof (struct ext2_group_desc); 784 sbi->s_sbh = bh; 785 sbi->s_mount_state = le16_to_cpu(es->s_state); 786 sbi->s_addr_per_block_bits = 787 log2 (EXT2_ADDR_PER_BLOCK(sb)); 788 sbi->s_desc_per_block_bits = 789 log2 (EXT2_DESC_PER_BLOCK(sb)); 790 791 if (sb->s_magic != EXT2_SUPER_MAGIC) 792 goto cantfind_ext2; 793 794 if (sb->s_blocksize != bh->b_size) { 795 if (!silent) 796 printk ("VFS: Unsupported blocksize on dev " 797 "%s.\n", sb->s_id); 798 goto failed_mount; 799 } 800 801 if (sb->s_blocksize != sbi->s_frag_size) { 802 printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n", 803 sbi->s_frag_size, sb->s_blocksize); 804 goto failed_mount; 805 } 806 807 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { 808 printk ("EXT2-fs: #blocks per group too big: %lu\n", 809 sbi->s_blocks_per_group); 810 goto failed_mount; 811 } 812 if (sbi->s_frags_per_group > sb->s_blocksize * 8) { 813 printk ("EXT2-fs: #fragments per group too big: %lu\n", 814 sbi->s_frags_per_group); 815 goto failed_mount; 816 } 817 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { 818 printk ("EXT2-fs: #inodes per group too big: %lu\n", 819 sbi->s_inodes_per_group); 820 goto failed_mount; 821 } 822 823 if (EXT2_BLOCKS_PER_GROUP(sb) == 0) 824 goto cantfind_ext2; 825 sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) - 826 le32_to_cpu(es->s_first_data_block) + 827 EXT2_BLOCKS_PER_GROUP(sb) - 1) / 828 EXT2_BLOCKS_PER_GROUP(sb); 829 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / 830 EXT2_DESC_PER_BLOCK(sb); 831 sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL); 832 if (sbi->s_group_desc == NULL) { 833 printk ("EXT2-fs: not enough memory\n"); 834 goto failed_mount; 835 } 836 bgl_lock_init(&sbi->s_blockgroup_lock); 837 sbi->s_debts = kmalloc(sbi->s_groups_count * sizeof(*sbi->s_debts), 838 GFP_KERNEL); 839 if (!sbi->s_debts) { 840 printk ("EXT2-fs: not enough memory\n"); 841 goto failed_mount_group_desc; 842 } 843 memset(sbi->s_debts, 0, sbi->s_groups_count * sizeof(*sbi->s_debts)); 844 for (i = 0; i < db_count; i++) { 845 block = descriptor_loc(sb, logic_sb_block, i); 846 sbi->s_group_desc[i] = sb_bread(sb, block); 847 if (!sbi->s_group_desc[i]) { 848 for (j = 0; j < i; j++) 849 brelse (sbi->s_group_desc[j]); 850 printk ("EXT2-fs: unable to read group descriptors\n"); 851 goto failed_mount_group_desc; 852 } 853 } 854 if (!ext2_check_descriptors (sb)) { 855 printk ("EXT2-fs: group descriptors corrupted!\n"); 856 goto failed_mount2; 857 } 858 sbi->s_gdb_count = db_count; 859 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 860 spin_lock_init(&sbi->s_next_gen_lock); 861 862 percpu_counter_init(&sbi->s_freeblocks_counter, 863 ext2_count_free_blocks(sb)); 864 percpu_counter_init(&sbi->s_freeinodes_counter, 865 ext2_count_free_inodes(sb)); 866 percpu_counter_init(&sbi->s_dirs_counter, 867 ext2_count_dirs(sb)); 868 /* 869 * set up enough so that it can read an inode 870 */ 871 sb->s_op = &ext2_sops; 872 sb->s_export_op = &ext2_export_ops; 873 sb->s_xattr = ext2_xattr_handlers; 874 root = iget(sb, EXT2_ROOT_INO); 875 sb->s_root = d_alloc_root(root); 876 if (!sb->s_root) { 877 iput(root); 878 printk(KERN_ERR "EXT2-fs: get root inode failed\n"); 879 goto failed_mount3; 880 } 881 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 882 dput(sb->s_root); 883 sb->s_root = NULL; 884 printk(KERN_ERR "EXT2-fs: corrupt root inode, run e2fsck\n"); 885 goto failed_mount3; 886 } 887 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 888 ext2_warning(sb, __FUNCTION__, 889 "mounting ext3 filesystem as ext2"); 890 ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY); 891 return 0; 892 893 cantfind_ext2: 894 if (!silent) 895 printk("VFS: Can't find an ext2 filesystem on dev %s.\n", 896 sb->s_id); 897 goto failed_mount; 898 failed_mount3: 899 percpu_counter_destroy(&sbi->s_freeblocks_counter); 900 percpu_counter_destroy(&sbi->s_freeinodes_counter); 901 percpu_counter_destroy(&sbi->s_dirs_counter); 902 failed_mount2: 903 for (i = 0; i < db_count; i++) 904 brelse(sbi->s_group_desc[i]); 905 failed_mount_group_desc: 906 kfree(sbi->s_group_desc); 907 kfree(sbi->s_debts); 908 failed_mount: 909 brelse(bh); 910 failed_sbi: 911 sb->s_fs_info = NULL; 912 kfree(sbi); 913 return -EINVAL; 914 } 915 916 static void ext2_commit_super (struct super_block * sb, 917 struct ext2_super_block * es) 918 { 919 es->s_wtime = cpu_to_le32(get_seconds()); 920 mark_buffer_dirty(EXT2_SB(sb)->s_sbh); 921 sb->s_dirt = 0; 922 } 923 924 static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es) 925 { 926 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); 927 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); 928 es->s_wtime = cpu_to_le32(get_seconds()); 929 mark_buffer_dirty(EXT2_SB(sb)->s_sbh); 930 sync_dirty_buffer(EXT2_SB(sb)->s_sbh); 931 sb->s_dirt = 0; 932 } 933 934 /* 935 * In the second extended file system, it is not necessary to 936 * write the super block since we use a mapping of the 937 * disk super block in a buffer. 938 * 939 * However, this function is still used to set the fs valid 940 * flags to 0. We need to set this flag to 0 since the fs 941 * may have been checked while mounted and e2fsck may have 942 * set s_state to EXT2_VALID_FS after some corrections. 943 */ 944 945 void ext2_write_super (struct super_block * sb) 946 { 947 struct ext2_super_block * es; 948 lock_kernel(); 949 if (!(sb->s_flags & MS_RDONLY)) { 950 es = EXT2_SB(sb)->s_es; 951 952 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS) { 953 ext2_debug ("setting valid to 0\n"); 954 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & 955 ~EXT2_VALID_FS); 956 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); 957 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); 958 es->s_mtime = cpu_to_le32(get_seconds()); 959 ext2_sync_super(sb, es); 960 } else 961 ext2_commit_super (sb, es); 962 } 963 sb->s_dirt = 0; 964 unlock_kernel(); 965 } 966 967 static int ext2_remount (struct super_block * sb, int * flags, char * data) 968 { 969 struct ext2_sb_info * sbi = EXT2_SB(sb); 970 struct ext2_super_block * es; 971 unsigned long old_mount_opt = sbi->s_mount_opt; 972 struct ext2_mount_options old_opts; 973 unsigned long old_sb_flags; 974 int err; 975 976 /* Store the old options */ 977 old_sb_flags = sb->s_flags; 978 old_opts.s_mount_opt = sbi->s_mount_opt; 979 old_opts.s_resuid = sbi->s_resuid; 980 old_opts.s_resgid = sbi->s_resgid; 981 982 /* 983 * Allow the "check" option to be passed as a remount option. 984 */ 985 if (!parse_options (data, sbi)) { 986 err = -EINVAL; 987 goto restore_opts; 988 } 989 990 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 991 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 992 993 es = sbi->s_es; 994 if (((sbi->s_mount_opt & EXT2_MOUNT_XIP) != 995 (old_mount_opt & EXT2_MOUNT_XIP)) && 996 invalidate_inodes(sb)) 997 ext2_warning(sb, __FUNCTION__, "busy inodes while remounting "\ 998 "xip remain in cache (no functional problem)"); 999 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 1000 return 0; 1001 if (*flags & MS_RDONLY) { 1002 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || 1003 !(sbi->s_mount_state & EXT2_VALID_FS)) 1004 return 0; 1005 /* 1006 * OK, we are remounting a valid rw partition rdonly, so set 1007 * the rdonly flag and then mark the partition as valid again. 1008 */ 1009 es->s_state = cpu_to_le16(sbi->s_mount_state); 1010 es->s_mtime = cpu_to_le32(get_seconds()); 1011 } else { 1012 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, 1013 ~EXT2_FEATURE_RO_COMPAT_SUPP); 1014 if (ret) { 1015 printk("EXT2-fs: %s: couldn't remount RDWR because of " 1016 "unsupported optional features (%x).\n", 1017 sb->s_id, le32_to_cpu(ret)); 1018 err = -EROFS; 1019 goto restore_opts; 1020 } 1021 /* 1022 * Mounting a RDONLY partition read-write, so reread and 1023 * store the current valid flag. (It may have been changed 1024 * by e2fsck since we originally mounted the partition.) 1025 */ 1026 sbi->s_mount_state = le16_to_cpu(es->s_state); 1027 if (!ext2_setup_super (sb, es, 0)) 1028 sb->s_flags &= ~MS_RDONLY; 1029 } 1030 ext2_sync_super(sb, es); 1031 return 0; 1032 restore_opts: 1033 sbi->s_mount_opt = old_opts.s_mount_opt; 1034 sbi->s_resuid = old_opts.s_resuid; 1035 sbi->s_resgid = old_opts.s_resgid; 1036 sb->s_flags = old_sb_flags; 1037 return err; 1038 } 1039 1040 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) 1041 { 1042 struct super_block *sb = dentry->d_sb; 1043 struct ext2_sb_info *sbi = EXT2_SB(sb); 1044 unsigned long overhead; 1045 int i; 1046 1047 lock_super(sb); 1048 if (test_opt (sb, MINIX_DF)) 1049 overhead = 0; 1050 else { 1051 /* 1052 * Compute the overhead (FS structures) 1053 */ 1054 1055 /* 1056 * All of the blocks before first_data_block are 1057 * overhead 1058 */ 1059 overhead = le32_to_cpu(sbi->s_es->s_first_data_block); 1060 1061 /* 1062 * Add the overhead attributed to the superblock and 1063 * block group descriptors. If the sparse superblocks 1064 * feature is turned on, then not all groups have this. 1065 */ 1066 for (i = 0; i < sbi->s_groups_count; i++) 1067 overhead += ext2_bg_has_super(sb, i) + 1068 ext2_bg_num_gdb(sb, i); 1069 1070 /* 1071 * Every block group has an inode bitmap, a block 1072 * bitmap, and an inode table. 1073 */ 1074 overhead += (sbi->s_groups_count * 1075 (2 + sbi->s_itb_per_group)); 1076 } 1077 1078 buf->f_type = EXT2_SUPER_MAGIC; 1079 buf->f_bsize = sb->s_blocksize; 1080 buf->f_blocks = le32_to_cpu(sbi->s_es->s_blocks_count) - overhead; 1081 buf->f_bfree = ext2_count_free_blocks(sb); 1082 buf->f_bavail = buf->f_bfree - le32_to_cpu(sbi->s_es->s_r_blocks_count); 1083 if (buf->f_bfree < le32_to_cpu(sbi->s_es->s_r_blocks_count)) 1084 buf->f_bavail = 0; 1085 buf->f_files = le32_to_cpu(sbi->s_es->s_inodes_count); 1086 buf->f_ffree = ext2_count_free_inodes (sb); 1087 buf->f_namelen = EXT2_NAME_LEN; 1088 unlock_super(sb); 1089 return 0; 1090 } 1091 1092 static int ext2_get_sb(struct file_system_type *fs_type, 1093 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 1094 { 1095 return get_sb_bdev(fs_type, flags, dev_name, data, ext2_fill_super, mnt); 1096 } 1097 1098 #ifdef CONFIG_QUOTA 1099 1100 /* Read data from quotafile - avoid pagecache and such because we cannot afford 1101 * acquiring the locks... As quota files are never truncated and quota code 1102 * itself serializes the operations (and noone else should touch the files) 1103 * we don't have to be afraid of races */ 1104 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, 1105 size_t len, loff_t off) 1106 { 1107 struct inode *inode = sb_dqopt(sb)->files[type]; 1108 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1109 int err = 0; 1110 int offset = off & (sb->s_blocksize - 1); 1111 int tocopy; 1112 size_t toread; 1113 struct buffer_head tmp_bh; 1114 struct buffer_head *bh; 1115 loff_t i_size = i_size_read(inode); 1116 1117 if (off > i_size) 1118 return 0; 1119 if (off+len > i_size) 1120 len = i_size-off; 1121 toread = len; 1122 while (toread > 0) { 1123 tocopy = sb->s_blocksize - offset < toread ? 1124 sb->s_blocksize - offset : toread; 1125 1126 tmp_bh.b_state = 0; 1127 err = ext2_get_block(inode, blk, &tmp_bh, 0); 1128 if (err) 1129 return err; 1130 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 1131 memset(data, 0, tocopy); 1132 else { 1133 bh = sb_bread(sb, tmp_bh.b_blocknr); 1134 if (!bh) 1135 return -EIO; 1136 memcpy(data, bh->b_data+offset, tocopy); 1137 brelse(bh); 1138 } 1139 offset = 0; 1140 toread -= tocopy; 1141 data += tocopy; 1142 blk++; 1143 } 1144 return len; 1145 } 1146 1147 /* Write to quotafile */ 1148 static ssize_t ext2_quota_write(struct super_block *sb, int type, 1149 const char *data, size_t len, loff_t off) 1150 { 1151 struct inode *inode = sb_dqopt(sb)->files[type]; 1152 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1153 int err = 0; 1154 int offset = off & (sb->s_blocksize - 1); 1155 int tocopy; 1156 size_t towrite = len; 1157 struct buffer_head tmp_bh; 1158 struct buffer_head *bh; 1159 1160 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 1161 while (towrite > 0) { 1162 tocopy = sb->s_blocksize - offset < towrite ? 1163 sb->s_blocksize - offset : towrite; 1164 1165 tmp_bh.b_state = 0; 1166 err = ext2_get_block(inode, blk, &tmp_bh, 1); 1167 if (err) 1168 goto out; 1169 if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) 1170 bh = sb_bread(sb, tmp_bh.b_blocknr); 1171 else 1172 bh = sb_getblk(sb, tmp_bh.b_blocknr); 1173 if (!bh) { 1174 err = -EIO; 1175 goto out; 1176 } 1177 lock_buffer(bh); 1178 memcpy(bh->b_data+offset, data, tocopy); 1179 flush_dcache_page(bh->b_page); 1180 set_buffer_uptodate(bh); 1181 mark_buffer_dirty(bh); 1182 unlock_buffer(bh); 1183 brelse(bh); 1184 offset = 0; 1185 towrite -= tocopy; 1186 data += tocopy; 1187 blk++; 1188 } 1189 out: 1190 if (len == towrite) 1191 return err; 1192 if (inode->i_size < off+len-towrite) 1193 i_size_write(inode, off+len-towrite); 1194 inode->i_version++; 1195 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 1196 mark_inode_dirty(inode); 1197 mutex_unlock(&inode->i_mutex); 1198 return len - towrite; 1199 } 1200 1201 #endif 1202 1203 static struct file_system_type ext2_fs_type = { 1204 .owner = THIS_MODULE, 1205 .name = "ext2", 1206 .get_sb = ext2_get_sb, 1207 .kill_sb = kill_block_super, 1208 .fs_flags = FS_REQUIRES_DEV, 1209 }; 1210 1211 static int __init init_ext2_fs(void) 1212 { 1213 int err = init_ext2_xattr(); 1214 if (err) 1215 return err; 1216 err = init_inodecache(); 1217 if (err) 1218 goto out1; 1219 err = register_filesystem(&ext2_fs_type); 1220 if (err) 1221 goto out; 1222 return 0; 1223 out: 1224 destroy_inodecache(); 1225 out1: 1226 exit_ext2_xattr(); 1227 return err; 1228 } 1229 1230 static void __exit exit_ext2_fs(void) 1231 { 1232 unregister_filesystem(&ext2_fs_type); 1233 destroy_inodecache(); 1234 exit_ext2_xattr(); 1235 } 1236 1237 module_init(init_ext2_fs) 1238 module_exit(exit_ext2_fs) 1239