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/fs.h> 23 #include <linux/slab.h> 24 #include <linux/init.h> 25 #include <linux/blkdev.h> 26 #include <linux/parser.h> 27 #include <linux/random.h> 28 #include <linux/buffer_head.h> 29 #include <linux/smp_lock.h> 30 #include <linux/vfs.h> 31 #include <linux/seq_file.h> 32 #include <linux/mount.h> 33 #include <asm/uaccess.h> 34 #include "ext2.h" 35 #include "xattr.h" 36 #include "acl.h" 37 #include "xip.h" 38 39 static void ext2_sync_super(struct super_block *sb, 40 struct ext2_super_block *es); 41 static int ext2_remount (struct super_block * sb, int * flags, char * data); 42 static int ext2_statfs (struct super_block * sb, struct kstatfs * buf); 43 44 void ext2_error (struct super_block * sb, const char * function, 45 const char * fmt, ...) 46 { 47 va_list args; 48 struct ext2_sb_info *sbi = EXT2_SB(sb); 49 struct ext2_super_block *es = sbi->s_es; 50 51 if (!(sb->s_flags & MS_RDONLY)) { 52 sbi->s_mount_state |= EXT2_ERROR_FS; 53 es->s_state = 54 cpu_to_le16(le16_to_cpu(es->s_state) | EXT2_ERROR_FS); 55 ext2_sync_super(sb, es); 56 } 57 58 va_start(args, fmt); 59 printk(KERN_CRIT "EXT2-fs error (device %s): %s: ",sb->s_id, function); 60 vprintk(fmt, args); 61 printk("\n"); 62 va_end(args); 63 64 if (test_opt(sb, ERRORS_PANIC)) 65 panic("EXT2-fs panic from previous error\n"); 66 if (test_opt(sb, ERRORS_RO)) { 67 printk("Remounting filesystem read-only\n"); 68 sb->s_flags |= MS_RDONLY; 69 } 70 } 71 72 void ext2_warning (struct super_block * sb, const char * function, 73 const char * fmt, ...) 74 { 75 va_list args; 76 77 va_start(args, fmt); 78 printk(KERN_WARNING "EXT2-fs warning (device %s): %s: ", 79 sb->s_id, function); 80 vprintk(fmt, args); 81 printk("\n"); 82 va_end(args); 83 } 84 85 void ext2_update_dynamic_rev(struct super_block *sb) 86 { 87 struct ext2_super_block *es = EXT2_SB(sb)->s_es; 88 89 if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV) 90 return; 91 92 ext2_warning(sb, __FUNCTION__, 93 "updating to rev %d because of new feature flag, " 94 "running e2fsck is recommended", 95 EXT2_DYNAMIC_REV); 96 97 es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO); 98 es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE); 99 es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV); 100 /* leave es->s_feature_*compat flags alone */ 101 /* es->s_uuid will be set by e2fsck if empty */ 102 103 /* 104 * The rest of the superblock fields should be zero, and if not it 105 * means they are likely already in use, so leave them alone. We 106 * can leave it up to e2fsck to clean up any inconsistencies there. 107 */ 108 } 109 110 static void ext2_put_super (struct super_block * sb) 111 { 112 int db_count; 113 int i; 114 struct ext2_sb_info *sbi = EXT2_SB(sb); 115 116 ext2_xattr_put_super(sb); 117 if (!(sb->s_flags & MS_RDONLY)) { 118 struct ext2_super_block *es = sbi->s_es; 119 120 es->s_state = cpu_to_le16(sbi->s_mount_state); 121 ext2_sync_super(sb, es); 122 } 123 db_count = sbi->s_gdb_count; 124 for (i = 0; i < db_count; i++) 125 if (sbi->s_group_desc[i]) 126 brelse (sbi->s_group_desc[i]); 127 kfree(sbi->s_group_desc); 128 kfree(sbi->s_debts); 129 percpu_counter_destroy(&sbi->s_freeblocks_counter); 130 percpu_counter_destroy(&sbi->s_freeinodes_counter); 131 percpu_counter_destroy(&sbi->s_dirs_counter); 132 brelse (sbi->s_sbh); 133 sb->s_fs_info = NULL; 134 kfree(sbi); 135 136 return; 137 } 138 139 static kmem_cache_t * ext2_inode_cachep; 140 141 static struct inode *ext2_alloc_inode(struct super_block *sb) 142 { 143 struct ext2_inode_info *ei; 144 ei = (struct ext2_inode_info *)kmem_cache_alloc(ext2_inode_cachep, SLAB_KERNEL); 145 if (!ei) 146 return NULL; 147 #ifdef CONFIG_EXT2_FS_POSIX_ACL 148 ei->i_acl = EXT2_ACL_NOT_CACHED; 149 ei->i_default_acl = EXT2_ACL_NOT_CACHED; 150 #endif 151 ei->vfs_inode.i_version = 1; 152 return &ei->vfs_inode; 153 } 154 155 static void ext2_destroy_inode(struct inode *inode) 156 { 157 kmem_cache_free(ext2_inode_cachep, EXT2_I(inode)); 158 } 159 160 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) 161 { 162 struct ext2_inode_info *ei = (struct ext2_inode_info *) foo; 163 164 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == 165 SLAB_CTOR_CONSTRUCTOR) { 166 rwlock_init(&ei->i_meta_lock); 167 #ifdef CONFIG_EXT2_FS_XATTR 168 init_rwsem(&ei->xattr_sem); 169 #endif 170 inode_init_once(&ei->vfs_inode); 171 } 172 } 173 174 static int init_inodecache(void) 175 { 176 ext2_inode_cachep = kmem_cache_create("ext2_inode_cache", 177 sizeof(struct ext2_inode_info), 178 0, (SLAB_RECLAIM_ACCOUNT| 179 SLAB_MEM_SPREAD), 180 init_once, NULL); 181 if (ext2_inode_cachep == NULL) 182 return -ENOMEM; 183 return 0; 184 } 185 186 static void destroy_inodecache(void) 187 { 188 if (kmem_cache_destroy(ext2_inode_cachep)) 189 printk(KERN_INFO "ext2_inode_cache: not all structures were freed\n"); 190 } 191 192 static void ext2_clear_inode(struct inode *inode) 193 { 194 #ifdef CONFIG_EXT2_FS_POSIX_ACL 195 struct ext2_inode_info *ei = EXT2_I(inode); 196 197 if (ei->i_acl && ei->i_acl != EXT2_ACL_NOT_CACHED) { 198 posix_acl_release(ei->i_acl); 199 ei->i_acl = EXT2_ACL_NOT_CACHED; 200 } 201 if (ei->i_default_acl && ei->i_default_acl != EXT2_ACL_NOT_CACHED) { 202 posix_acl_release(ei->i_default_acl); 203 ei->i_default_acl = EXT2_ACL_NOT_CACHED; 204 } 205 #endif 206 } 207 208 static int ext2_show_options(struct seq_file *seq, struct vfsmount *vfs) 209 { 210 struct ext2_sb_info *sbi = EXT2_SB(vfs->mnt_sb); 211 212 if (sbi->s_mount_opt & EXT2_MOUNT_GRPID) 213 seq_puts(seq, ",grpid"); 214 215 #if defined(CONFIG_QUOTA) 216 if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA) 217 seq_puts(seq, ",usrquota"); 218 219 if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA) 220 seq_puts(seq, ",grpquota"); 221 #endif 222 223 #if defined(CONFIG_EXT2_FS_XIP) 224 if (sbi->s_mount_opt & EXT2_MOUNT_XIP) 225 seq_puts(seq, ",xip"); 226 #endif 227 228 return 0; 229 } 230 231 #ifdef CONFIG_QUOTA 232 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); 233 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); 234 #endif 235 236 static struct super_operations ext2_sops = { 237 .alloc_inode = ext2_alloc_inode, 238 .destroy_inode = ext2_destroy_inode, 239 .read_inode = ext2_read_inode, 240 .write_inode = ext2_write_inode, 241 .put_inode = ext2_put_inode, 242 .delete_inode = ext2_delete_inode, 243 .put_super = ext2_put_super, 244 .write_super = ext2_write_super, 245 .statfs = ext2_statfs, 246 .remount_fs = ext2_remount, 247 .clear_inode = ext2_clear_inode, 248 .show_options = ext2_show_options, 249 #ifdef CONFIG_QUOTA 250 .quota_read = ext2_quota_read, 251 .quota_write = ext2_quota_write, 252 #endif 253 }; 254 255 /* Yes, most of these are left as NULL!! 256 * A NULL value implies the default, which works with ext2-like file 257 * systems, but can be improved upon. 258 * Currently only get_parent is required. 259 */ 260 static struct export_operations ext2_export_ops = { 261 .get_parent = ext2_get_parent, 262 }; 263 264 static unsigned long get_sb_block(void **data) 265 { 266 unsigned long sb_block; 267 char *options = (char *) *data; 268 269 if (!options || strncmp(options, "sb=", 3) != 0) 270 return 1; /* Default location */ 271 options += 3; 272 sb_block = simple_strtoul(options, &options, 0); 273 if (*options && *options != ',') { 274 printk("EXT2-fs: Invalid sb specification: %s\n", 275 (char *) *data); 276 return 1; 277 } 278 if (*options == ',') 279 options++; 280 *data = (void *) options; 281 return sb_block; 282 } 283 284 enum { 285 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 286 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, 287 Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug, 288 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, 289 Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota, 290 Opt_usrquota, Opt_grpquota 291 }; 292 293 static match_table_t tokens = { 294 {Opt_bsd_df, "bsddf"}, 295 {Opt_minix_df, "minixdf"}, 296 {Opt_grpid, "grpid"}, 297 {Opt_grpid, "bsdgroups"}, 298 {Opt_nogrpid, "nogrpid"}, 299 {Opt_nogrpid, "sysvgroups"}, 300 {Opt_resgid, "resgid=%u"}, 301 {Opt_resuid, "resuid=%u"}, 302 {Opt_sb, "sb=%u"}, 303 {Opt_err_cont, "errors=continue"}, 304 {Opt_err_panic, "errors=panic"}, 305 {Opt_err_ro, "errors=remount-ro"}, 306 {Opt_nouid32, "nouid32"}, 307 {Opt_nocheck, "check=none"}, 308 {Opt_nocheck, "nocheck"}, 309 {Opt_debug, "debug"}, 310 {Opt_oldalloc, "oldalloc"}, 311 {Opt_orlov, "orlov"}, 312 {Opt_nobh, "nobh"}, 313 {Opt_user_xattr, "user_xattr"}, 314 {Opt_nouser_xattr, "nouser_xattr"}, 315 {Opt_acl, "acl"}, 316 {Opt_noacl, "noacl"}, 317 {Opt_xip, "xip"}, 318 {Opt_grpquota, "grpquota"}, 319 {Opt_ignore, "noquota"}, 320 {Opt_quota, "quota"}, 321 {Opt_usrquota, "usrquota"}, 322 {Opt_err, NULL} 323 }; 324 325 static int parse_options (char * options, 326 struct ext2_sb_info *sbi) 327 { 328 char * p; 329 substring_t args[MAX_OPT_ARGS]; 330 unsigned long kind = EXT2_MOUNT_ERRORS_CONT; 331 int option; 332 333 if (!options) 334 return 1; 335 336 while ((p = strsep (&options, ",")) != NULL) { 337 int token; 338 if (!*p) 339 continue; 340 341 token = match_token(p, tokens, args); 342 switch (token) { 343 case Opt_bsd_df: 344 clear_opt (sbi->s_mount_opt, MINIX_DF); 345 break; 346 case Opt_minix_df: 347 set_opt (sbi->s_mount_opt, MINIX_DF); 348 break; 349 case Opt_grpid: 350 set_opt (sbi->s_mount_opt, GRPID); 351 break; 352 case Opt_nogrpid: 353 clear_opt (sbi->s_mount_opt, GRPID); 354 break; 355 case Opt_resuid: 356 if (match_int(&args[0], &option)) 357 return 0; 358 sbi->s_resuid = option; 359 break; 360 case Opt_resgid: 361 if (match_int(&args[0], &option)) 362 return 0; 363 sbi->s_resgid = option; 364 break; 365 case Opt_sb: 366 /* handled by get_sb_block() instead of here */ 367 /* *sb_block = match_int(&args[0]); */ 368 break; 369 case Opt_err_panic: 370 kind = EXT2_MOUNT_ERRORS_PANIC; 371 break; 372 case Opt_err_ro: 373 kind = EXT2_MOUNT_ERRORS_RO; 374 break; 375 case Opt_err_cont: 376 kind = EXT2_MOUNT_ERRORS_CONT; 377 break; 378 case Opt_nouid32: 379 set_opt (sbi->s_mount_opt, NO_UID32); 380 break; 381 case Opt_nocheck: 382 clear_opt (sbi->s_mount_opt, CHECK); 383 break; 384 case Opt_debug: 385 set_opt (sbi->s_mount_opt, DEBUG); 386 break; 387 case Opt_oldalloc: 388 set_opt (sbi->s_mount_opt, OLDALLOC); 389 break; 390 case Opt_orlov: 391 clear_opt (sbi->s_mount_opt, OLDALLOC); 392 break; 393 case Opt_nobh: 394 set_opt (sbi->s_mount_opt, NOBH); 395 break; 396 #ifdef CONFIG_EXT2_FS_XATTR 397 case Opt_user_xattr: 398 set_opt (sbi->s_mount_opt, XATTR_USER); 399 break; 400 case Opt_nouser_xattr: 401 clear_opt (sbi->s_mount_opt, XATTR_USER); 402 break; 403 #else 404 case Opt_user_xattr: 405 case Opt_nouser_xattr: 406 printk("EXT2 (no)user_xattr options not supported\n"); 407 break; 408 #endif 409 #ifdef CONFIG_EXT2_FS_POSIX_ACL 410 case Opt_acl: 411 set_opt(sbi->s_mount_opt, POSIX_ACL); 412 break; 413 case Opt_noacl: 414 clear_opt(sbi->s_mount_opt, POSIX_ACL); 415 break; 416 #else 417 case Opt_acl: 418 case Opt_noacl: 419 printk("EXT2 (no)acl options not supported\n"); 420 break; 421 #endif 422 case Opt_xip: 423 #ifdef CONFIG_EXT2_FS_XIP 424 set_opt (sbi->s_mount_opt, XIP); 425 #else 426 printk("EXT2 xip option not supported\n"); 427 #endif 428 break; 429 430 #if defined(CONFIG_QUOTA) 431 case Opt_quota: 432 case Opt_usrquota: 433 set_opt(sbi->s_mount_opt, USRQUOTA); 434 break; 435 436 case Opt_grpquota: 437 set_opt(sbi->s_mount_opt, GRPQUOTA); 438 break; 439 #else 440 case Opt_quota: 441 case Opt_usrquota: 442 case Opt_grpquota: 443 printk(KERN_ERR 444 "EXT2-fs: quota operations not supported.\n"); 445 446 break; 447 #endif 448 449 case Opt_ignore: 450 break; 451 default: 452 return 0; 453 } 454 } 455 sbi->s_mount_opt |= kind; 456 return 1; 457 } 458 459 static int ext2_setup_super (struct super_block * sb, 460 struct ext2_super_block * es, 461 int read_only) 462 { 463 int res = 0; 464 struct ext2_sb_info *sbi = EXT2_SB(sb); 465 466 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { 467 printk ("EXT2-fs warning: revision level too high, " 468 "forcing read-only mode\n"); 469 res = MS_RDONLY; 470 } 471 if (read_only) 472 return res; 473 if (!(sbi->s_mount_state & EXT2_VALID_FS)) 474 printk ("EXT2-fs warning: mounting unchecked fs, " 475 "running e2fsck is recommended\n"); 476 else if ((sbi->s_mount_state & EXT2_ERROR_FS)) 477 printk ("EXT2-fs warning: mounting fs with errors, " 478 "running e2fsck is recommended\n"); 479 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 480 le16_to_cpu(es->s_mnt_count) >= 481 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 482 printk ("EXT2-fs warning: maximal mount count reached, " 483 "running e2fsck is recommended\n"); 484 else if (le32_to_cpu(es->s_checkinterval) && 485 (le32_to_cpu(es->s_lastcheck) + le32_to_cpu(es->s_checkinterval) <= get_seconds())) 486 printk ("EXT2-fs warning: checktime reached, " 487 "running e2fsck is recommended\n"); 488 if (!le16_to_cpu(es->s_max_mnt_count)) 489 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); 490 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1); 491 ext2_write_super(sb); 492 if (test_opt (sb, DEBUG)) 493 printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, " 494 "bpg=%lu, ipg=%lu, mo=%04lx]\n", 495 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, 496 sbi->s_frag_size, 497 sbi->s_groups_count, 498 EXT2_BLOCKS_PER_GROUP(sb), 499 EXT2_INODES_PER_GROUP(sb), 500 sbi->s_mount_opt); 501 return res; 502 } 503 504 static int ext2_check_descriptors (struct super_block * sb) 505 { 506 int i; 507 int desc_block = 0; 508 struct ext2_sb_info *sbi = EXT2_SB(sb); 509 unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block); 510 struct ext2_group_desc * gdp = NULL; 511 512 ext2_debug ("Checking group descriptors"); 513 514 for (i = 0; i < sbi->s_groups_count; i++) 515 { 516 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0) 517 gdp = (struct ext2_group_desc *) sbi->s_group_desc[desc_block++]->b_data; 518 if (le32_to_cpu(gdp->bg_block_bitmap) < block || 519 le32_to_cpu(gdp->bg_block_bitmap) >= block + EXT2_BLOCKS_PER_GROUP(sb)) 520 { 521 ext2_error (sb, "ext2_check_descriptors", 522 "Block bitmap for group %d" 523 " not in group (block %lu)!", 524 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); 525 return 0; 526 } 527 if (le32_to_cpu(gdp->bg_inode_bitmap) < block || 528 le32_to_cpu(gdp->bg_inode_bitmap) >= block + EXT2_BLOCKS_PER_GROUP(sb)) 529 { 530 ext2_error (sb, "ext2_check_descriptors", 531 "Inode bitmap for group %d" 532 " not in group (block %lu)!", 533 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); 534 return 0; 535 } 536 if (le32_to_cpu(gdp->bg_inode_table) < block || 537 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >= 538 block + EXT2_BLOCKS_PER_GROUP(sb)) 539 { 540 ext2_error (sb, "ext2_check_descriptors", 541 "Inode table for group %d" 542 " not in group (block %lu)!", 543 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); 544 return 0; 545 } 546 block += EXT2_BLOCKS_PER_GROUP(sb); 547 gdp++; 548 } 549 return 1; 550 } 551 552 #define log2(n) ffz(~(n)) 553 554 /* 555 * Maximal file size. There is a direct, and {,double-,triple-}indirect 556 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. 557 * We need to be 1 filesystem block less than the 2^32 sector limit. 558 */ 559 static loff_t ext2_max_size(int bits) 560 { 561 loff_t res = EXT2_NDIR_BLOCKS; 562 /* This constant is calculated to be the largest file size for a 563 * dense, 4k-blocksize file such that the total number of 564 * sectors in the file, including data and all indirect blocks, 565 * does not exceed 2^32. */ 566 const loff_t upper_limit = 0x1ff7fffd000LL; 567 568 res += 1LL << (bits-2); 569 res += 1LL << (2*(bits-2)); 570 res += 1LL << (3*(bits-2)); 571 res <<= bits; 572 if (res > upper_limit) 573 res = upper_limit; 574 return res; 575 } 576 577 static unsigned long descriptor_loc(struct super_block *sb, 578 unsigned long logic_sb_block, 579 int nr) 580 { 581 struct ext2_sb_info *sbi = EXT2_SB(sb); 582 unsigned long bg, first_data_block, first_meta_bg; 583 int has_super = 0; 584 585 first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block); 586 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 587 588 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || 589 nr < first_meta_bg) 590 return (logic_sb_block + nr + 1); 591 bg = sbi->s_desc_per_block * nr; 592 if (ext2_bg_has_super(sb, bg)) 593 has_super = 1; 594 return (first_data_block + has_super + (bg * sbi->s_blocks_per_group)); 595 } 596 597 static int ext2_fill_super(struct super_block *sb, void *data, int silent) 598 { 599 struct buffer_head * bh; 600 struct ext2_sb_info * sbi; 601 struct ext2_super_block * es; 602 struct inode *root; 603 unsigned long block; 604 unsigned long sb_block = get_sb_block(&data); 605 unsigned long logic_sb_block; 606 unsigned long offset = 0; 607 unsigned long def_mount_opts; 608 int blocksize = BLOCK_SIZE; 609 int db_count; 610 int i, j; 611 __le32 features; 612 613 sbi = kmalloc(sizeof(*sbi), GFP_KERNEL); 614 if (!sbi) 615 return -ENOMEM; 616 sb->s_fs_info = sbi; 617 memset(sbi, 0, sizeof(*sbi)); 618 619 /* 620 * See what the current blocksize for the device is, and 621 * use that as the blocksize. Otherwise (or if the blocksize 622 * is smaller than the default) use the default. 623 * This is important for devices that have a hardware 624 * sectorsize that is larger than the default. 625 */ 626 blocksize = sb_min_blocksize(sb, BLOCK_SIZE); 627 if (!blocksize) { 628 printk ("EXT2-fs: unable to set blocksize\n"); 629 goto failed_sbi; 630 } 631 632 /* 633 * If the superblock doesn't start on a hardware sector boundary, 634 * calculate the offset. 635 */ 636 if (blocksize != BLOCK_SIZE) { 637 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 638 offset = (sb_block*BLOCK_SIZE) % blocksize; 639 } else { 640 logic_sb_block = sb_block; 641 } 642 643 if (!(bh = sb_bread(sb, logic_sb_block))) { 644 printk ("EXT2-fs: unable to read superblock\n"); 645 goto failed_sbi; 646 } 647 /* 648 * Note: s_es must be initialized as soon as possible because 649 * some ext2 macro-instructions depend on its value 650 */ 651 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 652 sbi->s_es = es; 653 sb->s_magic = le16_to_cpu(es->s_magic); 654 655 if (sb->s_magic != EXT2_SUPER_MAGIC) 656 goto cantfind_ext2; 657 658 /* Set defaults before we parse the mount options */ 659 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 660 if (def_mount_opts & EXT2_DEFM_DEBUG) 661 set_opt(sbi->s_mount_opt, DEBUG); 662 if (def_mount_opts & EXT2_DEFM_BSDGROUPS) 663 set_opt(sbi->s_mount_opt, GRPID); 664 if (def_mount_opts & EXT2_DEFM_UID16) 665 set_opt(sbi->s_mount_opt, NO_UID32); 666 if (def_mount_opts & EXT2_DEFM_XATTR_USER) 667 set_opt(sbi->s_mount_opt, XATTR_USER); 668 if (def_mount_opts & EXT2_DEFM_ACL) 669 set_opt(sbi->s_mount_opt, POSIX_ACL); 670 671 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) 672 set_opt(sbi->s_mount_opt, ERRORS_PANIC); 673 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_RO) 674 set_opt(sbi->s_mount_opt, ERRORS_RO); 675 676 sbi->s_resuid = le16_to_cpu(es->s_def_resuid); 677 sbi->s_resgid = le16_to_cpu(es->s_def_resgid); 678 679 if (!parse_options ((char *) data, sbi)) 680 goto failed_mount; 681 682 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 683 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? 684 MS_POSIXACL : 0); 685 686 ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset 687 EXT2_MOUNT_XIP if not */ 688 689 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && 690 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || 691 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 692 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) 693 printk("EXT2-fs warning: feature flags set on rev 0 fs, " 694 "running e2fsck is recommended\n"); 695 /* 696 * Check feature flags regardless of the revision level, since we 697 * previously didn't change the revision level when setting the flags, 698 * so there is a chance incompat flags are set on a rev 0 filesystem. 699 */ 700 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); 701 if (features) { 702 printk("EXT2-fs: %s: couldn't mount because of " 703 "unsupported optional features (%x).\n", 704 sb->s_id, le32_to_cpu(features)); 705 goto failed_mount; 706 } 707 if (!(sb->s_flags & MS_RDONLY) && 708 (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ 709 printk("EXT2-fs: %s: couldn't mount RDWR because of " 710 "unsupported optional features (%x).\n", 711 sb->s_id, le32_to_cpu(features)); 712 goto failed_mount; 713 } 714 715 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); 716 717 if ((ext2_use_xip(sb)) && ((blocksize != PAGE_SIZE) || 718 (sb->s_blocksize != blocksize))) { 719 if (!silent) 720 printk("XIP: Unsupported blocksize\n"); 721 goto failed_mount; 722 } 723 724 /* If the blocksize doesn't match, re-read the thing.. */ 725 if (sb->s_blocksize != blocksize) { 726 brelse(bh); 727 728 if (!sb_set_blocksize(sb, blocksize)) { 729 printk(KERN_ERR "EXT2-fs: blocksize too small for device.\n"); 730 goto failed_sbi; 731 } 732 733 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 734 offset = (sb_block*BLOCK_SIZE) % blocksize; 735 bh = sb_bread(sb, logic_sb_block); 736 if(!bh) { 737 printk("EXT2-fs: Couldn't read superblock on " 738 "2nd try.\n"); 739 goto failed_sbi; 740 } 741 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 742 sbi->s_es = es; 743 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { 744 printk ("EXT2-fs: Magic mismatch, very weird !\n"); 745 goto failed_mount; 746 } 747 } 748 749 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); 750 751 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { 752 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; 753 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; 754 } else { 755 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 756 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 757 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || 758 (sbi->s_inode_size & (sbi->s_inode_size - 1)) || 759 (sbi->s_inode_size > blocksize)) { 760 printk ("EXT2-fs: unsupported inode size: %d\n", 761 sbi->s_inode_size); 762 goto failed_mount; 763 } 764 } 765 766 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << 767 le32_to_cpu(es->s_log_frag_size); 768 if (sbi->s_frag_size == 0) 769 goto cantfind_ext2; 770 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; 771 772 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 773 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); 774 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 775 776 if (EXT2_INODE_SIZE(sb) == 0) 777 goto cantfind_ext2; 778 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); 779 if (sbi->s_inodes_per_block == 0) 780 goto cantfind_ext2; 781 sbi->s_itb_per_group = sbi->s_inodes_per_group / 782 sbi->s_inodes_per_block; 783 sbi->s_desc_per_block = sb->s_blocksize / 784 sizeof (struct ext2_group_desc); 785 sbi->s_sbh = bh; 786 sbi->s_mount_state = le16_to_cpu(es->s_state); 787 sbi->s_addr_per_block_bits = 788 log2 (EXT2_ADDR_PER_BLOCK(sb)); 789 sbi->s_desc_per_block_bits = 790 log2 (EXT2_DESC_PER_BLOCK(sb)); 791 792 if (sb->s_magic != EXT2_SUPER_MAGIC) 793 goto cantfind_ext2; 794 795 if (sb->s_blocksize != bh->b_size) { 796 if (!silent) 797 printk ("VFS: Unsupported blocksize on dev " 798 "%s.\n", sb->s_id); 799 goto failed_mount; 800 } 801 802 if (sb->s_blocksize != sbi->s_frag_size) { 803 printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n", 804 sbi->s_frag_size, sb->s_blocksize); 805 goto failed_mount; 806 } 807 808 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { 809 printk ("EXT2-fs: #blocks per group too big: %lu\n", 810 sbi->s_blocks_per_group); 811 goto failed_mount; 812 } 813 if (sbi->s_frags_per_group > sb->s_blocksize * 8) { 814 printk ("EXT2-fs: #fragments per group too big: %lu\n", 815 sbi->s_frags_per_group); 816 goto failed_mount; 817 } 818 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { 819 printk ("EXT2-fs: #inodes per group too big: %lu\n", 820 sbi->s_inodes_per_group); 821 goto failed_mount; 822 } 823 824 if (EXT2_BLOCKS_PER_GROUP(sb) == 0) 825 goto cantfind_ext2; 826 sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) - 827 le32_to_cpu(es->s_first_data_block) + 828 EXT2_BLOCKS_PER_GROUP(sb) - 1) / 829 EXT2_BLOCKS_PER_GROUP(sb); 830 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / 831 EXT2_DESC_PER_BLOCK(sb); 832 sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL); 833 if (sbi->s_group_desc == NULL) { 834 printk ("EXT2-fs: not enough memory\n"); 835 goto failed_mount; 836 } 837 percpu_counter_init(&sbi->s_freeblocks_counter); 838 percpu_counter_init(&sbi->s_freeinodes_counter); 839 percpu_counter_init(&sbi->s_dirs_counter); 840 bgl_lock_init(&sbi->s_blockgroup_lock); 841 sbi->s_debts = kmalloc(sbi->s_groups_count * sizeof(*sbi->s_debts), 842 GFP_KERNEL); 843 if (!sbi->s_debts) { 844 printk ("EXT2-fs: not enough memory\n"); 845 goto failed_mount_group_desc; 846 } 847 memset(sbi->s_debts, 0, sbi->s_groups_count * sizeof(*sbi->s_debts)); 848 for (i = 0; i < db_count; i++) { 849 block = descriptor_loc(sb, logic_sb_block, i); 850 sbi->s_group_desc[i] = sb_bread(sb, block); 851 if (!sbi->s_group_desc[i]) { 852 for (j = 0; j < i; j++) 853 brelse (sbi->s_group_desc[j]); 854 printk ("EXT2-fs: unable to read group descriptors\n"); 855 goto failed_mount_group_desc; 856 } 857 } 858 if (!ext2_check_descriptors (sb)) { 859 printk ("EXT2-fs: group descriptors corrupted!\n"); 860 db_count = i; 861 goto failed_mount2; 862 } 863 sbi->s_gdb_count = db_count; 864 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 865 spin_lock_init(&sbi->s_next_gen_lock); 866 /* 867 * set up enough so that it can read an inode 868 */ 869 sb->s_op = &ext2_sops; 870 sb->s_export_op = &ext2_export_ops; 871 sb->s_xattr = ext2_xattr_handlers; 872 root = iget(sb, EXT2_ROOT_INO); 873 sb->s_root = d_alloc_root(root); 874 if (!sb->s_root) { 875 iput(root); 876 printk(KERN_ERR "EXT2-fs: get root inode failed\n"); 877 goto failed_mount2; 878 } 879 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 880 dput(sb->s_root); 881 sb->s_root = NULL; 882 printk(KERN_ERR "EXT2-fs: corrupt root inode, run e2fsck\n"); 883 goto failed_mount2; 884 } 885 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 886 ext2_warning(sb, __FUNCTION__, 887 "mounting ext3 filesystem as ext2"); 888 ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY); 889 percpu_counter_mod(&sbi->s_freeblocks_counter, 890 ext2_count_free_blocks(sb)); 891 percpu_counter_mod(&sbi->s_freeinodes_counter, 892 ext2_count_free_inodes(sb)); 893 percpu_counter_mod(&sbi->s_dirs_counter, 894 ext2_count_dirs(sb)); 895 return 0; 896 897 cantfind_ext2: 898 if (!silent) 899 printk("VFS: Can't find an ext2 filesystem on dev %s.\n", 900 sb->s_id); 901 goto failed_mount; 902 903 failed_mount2: 904 for (i = 0; i < db_count; i++) 905 brelse(sbi->s_group_desc[i]); 906 failed_mount_group_desc: 907 kfree(sbi->s_group_desc); 908 kfree(sbi->s_debts); 909 failed_mount: 910 brelse(bh); 911 failed_sbi: 912 sb->s_fs_info = NULL; 913 kfree(sbi); 914 return -EINVAL; 915 } 916 917 static void ext2_commit_super (struct super_block * sb, 918 struct ext2_super_block * es) 919 { 920 es->s_wtime = cpu_to_le32(get_seconds()); 921 mark_buffer_dirty(EXT2_SB(sb)->s_sbh); 922 sb->s_dirt = 0; 923 } 924 925 static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es) 926 { 927 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); 928 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); 929 es->s_wtime = cpu_to_le32(get_seconds()); 930 mark_buffer_dirty(EXT2_SB(sb)->s_sbh); 931 sync_dirty_buffer(EXT2_SB(sb)->s_sbh); 932 sb->s_dirt = 0; 933 } 934 935 /* 936 * In the second extended file system, it is not necessary to 937 * write the super block since we use a mapping of the 938 * disk super block in a buffer. 939 * 940 * However, this function is still used to set the fs valid 941 * flags to 0. We need to set this flag to 0 since the fs 942 * may have been checked while mounted and e2fsck may have 943 * set s_state to EXT2_VALID_FS after some corrections. 944 */ 945 946 void ext2_write_super (struct super_block * sb) 947 { 948 struct ext2_super_block * es; 949 lock_kernel(); 950 if (!(sb->s_flags & MS_RDONLY)) { 951 es = EXT2_SB(sb)->s_es; 952 953 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS) { 954 ext2_debug ("setting valid to 0\n"); 955 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & 956 ~EXT2_VALID_FS); 957 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); 958 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); 959 es->s_mtime = cpu_to_le32(get_seconds()); 960 ext2_sync_super(sb, es); 961 } else 962 ext2_commit_super (sb, es); 963 } 964 sb->s_dirt = 0; 965 unlock_kernel(); 966 } 967 968 static int ext2_remount (struct super_block * sb, int * flags, char * data) 969 { 970 struct ext2_sb_info * sbi = EXT2_SB(sb); 971 struct ext2_super_block * es; 972 unsigned long old_mount_opt = sbi->s_mount_opt; 973 struct ext2_mount_options old_opts; 974 unsigned long old_sb_flags; 975 int err; 976 977 /* Store the old options */ 978 old_sb_flags = sb->s_flags; 979 old_opts.s_mount_opt = sbi->s_mount_opt; 980 old_opts.s_resuid = sbi->s_resuid; 981 old_opts.s_resgid = sbi->s_resgid; 982 983 /* 984 * Allow the "check" option to be passed as a remount option. 985 */ 986 if (!parse_options (data, sbi)) { 987 err = -EINVAL; 988 goto restore_opts; 989 } 990 991 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 992 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 993 994 es = sbi->s_es; 995 if (((sbi->s_mount_opt & EXT2_MOUNT_XIP) != 996 (old_mount_opt & EXT2_MOUNT_XIP)) && 997 invalidate_inodes(sb)) 998 ext2_warning(sb, __FUNCTION__, "busy inodes while remounting "\ 999 "xip remain in cache (no functional problem)"); 1000 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 1001 return 0; 1002 if (*flags & MS_RDONLY) { 1003 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || 1004 !(sbi->s_mount_state & EXT2_VALID_FS)) 1005 return 0; 1006 /* 1007 * OK, we are remounting a valid rw partition rdonly, so set 1008 * the rdonly flag and then mark the partition as valid again. 1009 */ 1010 es->s_state = cpu_to_le16(sbi->s_mount_state); 1011 es->s_mtime = cpu_to_le32(get_seconds()); 1012 } else { 1013 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, 1014 ~EXT2_FEATURE_RO_COMPAT_SUPP); 1015 if (ret) { 1016 printk("EXT2-fs: %s: couldn't remount RDWR because of " 1017 "unsupported optional features (%x).\n", 1018 sb->s_id, le32_to_cpu(ret)); 1019 err = -EROFS; 1020 goto restore_opts; 1021 } 1022 /* 1023 * Mounting a RDONLY partition read-write, so reread and 1024 * store the current valid flag. (It may have been changed 1025 * by e2fsck since we originally mounted the partition.) 1026 */ 1027 sbi->s_mount_state = le16_to_cpu(es->s_state); 1028 if (!ext2_setup_super (sb, es, 0)) 1029 sb->s_flags &= ~MS_RDONLY; 1030 } 1031 ext2_sync_super(sb, es); 1032 return 0; 1033 restore_opts: 1034 sbi->s_mount_opt = old_opts.s_mount_opt; 1035 sbi->s_resuid = old_opts.s_resuid; 1036 sbi->s_resgid = old_opts.s_resgid; 1037 sb->s_flags = old_sb_flags; 1038 return err; 1039 } 1040 1041 static int ext2_statfs (struct super_block * sb, struct kstatfs * buf) 1042 { 1043 struct ext2_sb_info *sbi = EXT2_SB(sb); 1044 unsigned long overhead; 1045 int i; 1046 1047 if (test_opt (sb, MINIX_DF)) 1048 overhead = 0; 1049 else { 1050 /* 1051 * Compute the overhead (FS structures) 1052 */ 1053 1054 /* 1055 * All of the blocks before first_data_block are 1056 * overhead 1057 */ 1058 overhead = le32_to_cpu(sbi->s_es->s_first_data_block); 1059 1060 /* 1061 * Add the overhead attributed to the superblock and 1062 * block group descriptors. If the sparse superblocks 1063 * feature is turned on, then not all groups have this. 1064 */ 1065 for (i = 0; i < sbi->s_groups_count; i++) 1066 overhead += ext2_bg_has_super(sb, i) + 1067 ext2_bg_num_gdb(sb, i); 1068 1069 /* 1070 * Every block group has an inode bitmap, a block 1071 * bitmap, and an inode table. 1072 */ 1073 overhead += (sbi->s_groups_count * 1074 (2 + sbi->s_itb_per_group)); 1075 } 1076 1077 buf->f_type = EXT2_SUPER_MAGIC; 1078 buf->f_bsize = sb->s_blocksize; 1079 buf->f_blocks = le32_to_cpu(sbi->s_es->s_blocks_count) - overhead; 1080 buf->f_bfree = ext2_count_free_blocks(sb); 1081 buf->f_bavail = buf->f_bfree - le32_to_cpu(sbi->s_es->s_r_blocks_count); 1082 if (buf->f_bfree < le32_to_cpu(sbi->s_es->s_r_blocks_count)) 1083 buf->f_bavail = 0; 1084 buf->f_files = le32_to_cpu(sbi->s_es->s_inodes_count); 1085 buf->f_ffree = ext2_count_free_inodes (sb); 1086 buf->f_namelen = EXT2_NAME_LEN; 1087 return 0; 1088 } 1089 1090 static struct super_block *ext2_get_sb(struct file_system_type *fs_type, 1091 int flags, const char *dev_name, void *data) 1092 { 1093 return get_sb_bdev(fs_type, flags, dev_name, data, ext2_fill_super); 1094 } 1095 1096 #ifdef CONFIG_QUOTA 1097 1098 /* Read data from quotafile - avoid pagecache and such because we cannot afford 1099 * acquiring the locks... As quota files are never truncated and quota code 1100 * itself serializes the operations (and noone else should touch the files) 1101 * we don't have to be afraid of races */ 1102 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, 1103 size_t len, loff_t off) 1104 { 1105 struct inode *inode = sb_dqopt(sb)->files[type]; 1106 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1107 int err = 0; 1108 int offset = off & (sb->s_blocksize - 1); 1109 int tocopy; 1110 size_t toread; 1111 struct buffer_head tmp_bh; 1112 struct buffer_head *bh; 1113 loff_t i_size = i_size_read(inode); 1114 1115 if (off > i_size) 1116 return 0; 1117 if (off+len > i_size) 1118 len = i_size-off; 1119 toread = len; 1120 while (toread > 0) { 1121 tocopy = sb->s_blocksize - offset < toread ? 1122 sb->s_blocksize - offset : toread; 1123 1124 tmp_bh.b_state = 0; 1125 err = ext2_get_block(inode, blk, &tmp_bh, 0); 1126 if (err) 1127 return err; 1128 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 1129 memset(data, 0, tocopy); 1130 else { 1131 bh = sb_bread(sb, tmp_bh.b_blocknr); 1132 if (!bh) 1133 return -EIO; 1134 memcpy(data, bh->b_data+offset, tocopy); 1135 brelse(bh); 1136 } 1137 offset = 0; 1138 toread -= tocopy; 1139 data += tocopy; 1140 blk++; 1141 } 1142 return len; 1143 } 1144 1145 /* Write to quotafile */ 1146 static ssize_t ext2_quota_write(struct super_block *sb, int type, 1147 const char *data, size_t len, loff_t off) 1148 { 1149 struct inode *inode = sb_dqopt(sb)->files[type]; 1150 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1151 int err = 0; 1152 int offset = off & (sb->s_blocksize - 1); 1153 int tocopy; 1154 size_t towrite = len; 1155 struct buffer_head tmp_bh; 1156 struct buffer_head *bh; 1157 1158 mutex_lock(&inode->i_mutex); 1159 while (towrite > 0) { 1160 tocopy = sb->s_blocksize - offset < towrite ? 1161 sb->s_blocksize - offset : towrite; 1162 1163 tmp_bh.b_state = 0; 1164 err = ext2_get_block(inode, blk, &tmp_bh, 1); 1165 if (err) 1166 goto out; 1167 if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) 1168 bh = sb_bread(sb, tmp_bh.b_blocknr); 1169 else 1170 bh = sb_getblk(sb, tmp_bh.b_blocknr); 1171 if (!bh) { 1172 err = -EIO; 1173 goto out; 1174 } 1175 lock_buffer(bh); 1176 memcpy(bh->b_data+offset, data, tocopy); 1177 flush_dcache_page(bh->b_page); 1178 set_buffer_uptodate(bh); 1179 mark_buffer_dirty(bh); 1180 unlock_buffer(bh); 1181 brelse(bh); 1182 offset = 0; 1183 towrite -= tocopy; 1184 data += tocopy; 1185 blk++; 1186 } 1187 out: 1188 if (len == towrite) 1189 return err; 1190 if (inode->i_size < off+len-towrite) 1191 i_size_write(inode, off+len-towrite); 1192 inode->i_version++; 1193 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 1194 mark_inode_dirty(inode); 1195 mutex_unlock(&inode->i_mutex); 1196 return len - towrite; 1197 } 1198 1199 #endif 1200 1201 static struct file_system_type ext2_fs_type = { 1202 .owner = THIS_MODULE, 1203 .name = "ext2", 1204 .get_sb = ext2_get_sb, 1205 .kill_sb = kill_block_super, 1206 .fs_flags = FS_REQUIRES_DEV, 1207 }; 1208 1209 static int __init init_ext2_fs(void) 1210 { 1211 int err = init_ext2_xattr(); 1212 if (err) 1213 return err; 1214 err = init_inodecache(); 1215 if (err) 1216 goto out1; 1217 err = register_filesystem(&ext2_fs_type); 1218 if (err) 1219 goto out; 1220 return 0; 1221 out: 1222 destroy_inodecache(); 1223 out1: 1224 exit_ext2_xattr(); 1225 return err; 1226 } 1227 1228 static void __exit exit_ext2_fs(void) 1229 { 1230 unregister_filesystem(&ext2_fs_type); 1231 destroy_inodecache(); 1232 exit_ext2_xattr(); 1233 } 1234 1235 module_init(init_ext2_fs) 1236 module_exit(exit_ext2_fs) 1237