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 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 else 214 seq_puts(seq, ",nogrpid"); 215 216 #if defined(CONFIG_QUOTA) 217 if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA) 218 seq_puts(seq, ",usrquota"); 219 220 if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA) 221 seq_puts(seq, ",grpquota"); 222 #endif 223 224 return 0; 225 } 226 227 #ifdef CONFIG_QUOTA 228 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); 229 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); 230 #endif 231 232 static struct super_operations ext2_sops = { 233 .alloc_inode = ext2_alloc_inode, 234 .destroy_inode = ext2_destroy_inode, 235 .read_inode = ext2_read_inode, 236 .write_inode = ext2_write_inode, 237 .put_inode = ext2_put_inode, 238 .delete_inode = ext2_delete_inode, 239 .put_super = ext2_put_super, 240 .write_super = ext2_write_super, 241 .statfs = ext2_statfs, 242 .remount_fs = ext2_remount, 243 .clear_inode = ext2_clear_inode, 244 .show_options = ext2_show_options, 245 #ifdef CONFIG_QUOTA 246 .quota_read = ext2_quota_read, 247 .quota_write = ext2_quota_write, 248 #endif 249 }; 250 251 /* Yes, most of these are left as NULL!! 252 * A NULL value implies the default, which works with ext2-like file 253 * systems, but can be improved upon. 254 * Currently only get_parent is required. 255 */ 256 struct dentry *ext2_get_parent(struct dentry *child); 257 static struct export_operations ext2_export_ops = { 258 .get_parent = ext2_get_parent, 259 }; 260 261 static unsigned long get_sb_block(void **data) 262 { 263 unsigned long sb_block; 264 char *options = (char *) *data; 265 266 if (!options || strncmp(options, "sb=", 3) != 0) 267 return 1; /* Default location */ 268 options += 3; 269 sb_block = simple_strtoul(options, &options, 0); 270 if (*options && *options != ',') { 271 printk("EXT2-fs: Invalid sb specification: %s\n", 272 (char *) *data); 273 return 1; 274 } 275 if (*options == ',') 276 options++; 277 *data = (void *) options; 278 return sb_block; 279 } 280 281 enum { 282 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 283 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, 284 Opt_err_ro, Opt_nouid32, Opt_check, Opt_nocheck, Opt_debug, 285 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, 286 Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota, 287 Opt_usrquota, Opt_grpquota 288 }; 289 290 static match_table_t tokens = { 291 {Opt_bsd_df, "bsddf"}, 292 {Opt_minix_df, "minixdf"}, 293 {Opt_grpid, "grpid"}, 294 {Opt_grpid, "bsdgroups"}, 295 {Opt_nogrpid, "nogrpid"}, 296 {Opt_nogrpid, "sysvgroups"}, 297 {Opt_resgid, "resgid=%u"}, 298 {Opt_resuid, "resuid=%u"}, 299 {Opt_sb, "sb=%u"}, 300 {Opt_err_cont, "errors=continue"}, 301 {Opt_err_panic, "errors=panic"}, 302 {Opt_err_ro, "errors=remount-ro"}, 303 {Opt_nouid32, "nouid32"}, 304 {Opt_nocheck, "check=none"}, 305 {Opt_nocheck, "nocheck"}, 306 {Opt_check, "check"}, 307 {Opt_debug, "debug"}, 308 {Opt_oldalloc, "oldalloc"}, 309 {Opt_orlov, "orlov"}, 310 {Opt_nobh, "nobh"}, 311 {Opt_user_xattr, "user_xattr"}, 312 {Opt_nouser_xattr, "nouser_xattr"}, 313 {Opt_acl, "acl"}, 314 {Opt_noacl, "noacl"}, 315 {Opt_xip, "xip"}, 316 {Opt_grpquota, "grpquota"}, 317 {Opt_ignore, "noquota"}, 318 {Opt_quota, "quota"}, 319 {Opt_usrquota, "usrquota"}, 320 {Opt_err, NULL} 321 }; 322 323 static int parse_options (char * options, 324 struct ext2_sb_info *sbi) 325 { 326 char * p; 327 substring_t args[MAX_OPT_ARGS]; 328 unsigned long kind = EXT2_MOUNT_ERRORS_CONT; 329 int option; 330 331 if (!options) 332 return 1; 333 334 while ((p = strsep (&options, ",")) != NULL) { 335 int token; 336 if (!*p) 337 continue; 338 339 token = match_token(p, tokens, args); 340 switch (token) { 341 case Opt_bsd_df: 342 clear_opt (sbi->s_mount_opt, MINIX_DF); 343 break; 344 case Opt_minix_df: 345 set_opt (sbi->s_mount_opt, MINIX_DF); 346 break; 347 case Opt_grpid: 348 set_opt (sbi->s_mount_opt, GRPID); 349 break; 350 case Opt_nogrpid: 351 clear_opt (sbi->s_mount_opt, GRPID); 352 break; 353 case Opt_resuid: 354 if (match_int(&args[0], &option)) 355 return 0; 356 sbi->s_resuid = option; 357 break; 358 case Opt_resgid: 359 if (match_int(&args[0], &option)) 360 return 0; 361 sbi->s_resgid = option; 362 break; 363 case Opt_sb: 364 /* handled by get_sb_block() instead of here */ 365 /* *sb_block = match_int(&args[0]); */ 366 break; 367 case Opt_err_panic: 368 kind = EXT2_MOUNT_ERRORS_PANIC; 369 break; 370 case Opt_err_ro: 371 kind = EXT2_MOUNT_ERRORS_RO; 372 break; 373 case Opt_err_cont: 374 kind = EXT2_MOUNT_ERRORS_CONT; 375 break; 376 case Opt_nouid32: 377 set_opt (sbi->s_mount_opt, NO_UID32); 378 break; 379 case Opt_check: 380 #ifdef CONFIG_EXT2_CHECK 381 set_opt (sbi->s_mount_opt, CHECK); 382 #else 383 printk("EXT2 Check option not supported\n"); 384 #endif 385 break; 386 case Opt_nocheck: 387 clear_opt (sbi->s_mount_opt, CHECK); 388 break; 389 case Opt_debug: 390 set_opt (sbi->s_mount_opt, DEBUG); 391 break; 392 case Opt_oldalloc: 393 set_opt (sbi->s_mount_opt, OLDALLOC); 394 break; 395 case Opt_orlov: 396 clear_opt (sbi->s_mount_opt, OLDALLOC); 397 break; 398 case Opt_nobh: 399 set_opt (sbi->s_mount_opt, NOBH); 400 break; 401 #ifdef CONFIG_EXT2_FS_XATTR 402 case Opt_user_xattr: 403 set_opt (sbi->s_mount_opt, XATTR_USER); 404 break; 405 case Opt_nouser_xattr: 406 clear_opt (sbi->s_mount_opt, XATTR_USER); 407 break; 408 #else 409 case Opt_user_xattr: 410 case Opt_nouser_xattr: 411 printk("EXT2 (no)user_xattr options not supported\n"); 412 break; 413 #endif 414 #ifdef CONFIG_EXT2_FS_POSIX_ACL 415 case Opt_acl: 416 set_opt(sbi->s_mount_opt, POSIX_ACL); 417 break; 418 case Opt_noacl: 419 clear_opt(sbi->s_mount_opt, POSIX_ACL); 420 break; 421 #else 422 case Opt_acl: 423 case Opt_noacl: 424 printk("EXT2 (no)acl options not supported\n"); 425 break; 426 #endif 427 case Opt_xip: 428 #ifdef CONFIG_EXT2_FS_XIP 429 set_opt (sbi->s_mount_opt, XIP); 430 #else 431 printk("EXT2 xip option not supported\n"); 432 #endif 433 break; 434 435 #if defined(CONFIG_QUOTA) 436 case Opt_quota: 437 case Opt_usrquota: 438 set_opt(sbi->s_mount_opt, USRQUOTA); 439 break; 440 441 case Opt_grpquota: 442 set_opt(sbi->s_mount_opt, GRPQUOTA); 443 break; 444 #else 445 case Opt_quota: 446 case Opt_usrquota: 447 case Opt_grpquota: 448 printk(KERN_ERR 449 "EXT2-fs: quota operations not supported.\n"); 450 451 break; 452 #endif 453 454 case Opt_ignore: 455 break; 456 default: 457 return 0; 458 } 459 } 460 sbi->s_mount_opt |= kind; 461 return 1; 462 } 463 464 static int ext2_setup_super (struct super_block * sb, 465 struct ext2_super_block * es, 466 int read_only) 467 { 468 int res = 0; 469 struct ext2_sb_info *sbi = EXT2_SB(sb); 470 471 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { 472 printk ("EXT2-fs warning: revision level too high, " 473 "forcing read-only mode\n"); 474 res = MS_RDONLY; 475 } 476 if (read_only) 477 return res; 478 if (!(sbi->s_mount_state & EXT2_VALID_FS)) 479 printk ("EXT2-fs warning: mounting unchecked fs, " 480 "running e2fsck is recommended\n"); 481 else if ((sbi->s_mount_state & EXT2_ERROR_FS)) 482 printk ("EXT2-fs warning: mounting fs with errors, " 483 "running e2fsck is recommended\n"); 484 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 485 le16_to_cpu(es->s_mnt_count) >= 486 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 487 printk ("EXT2-fs warning: maximal mount count reached, " 488 "running e2fsck is recommended\n"); 489 else if (le32_to_cpu(es->s_checkinterval) && 490 (le32_to_cpu(es->s_lastcheck) + le32_to_cpu(es->s_checkinterval) <= get_seconds())) 491 printk ("EXT2-fs warning: checktime reached, " 492 "running e2fsck is recommended\n"); 493 if (!le16_to_cpu(es->s_max_mnt_count)) 494 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); 495 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1); 496 ext2_write_super(sb); 497 if (test_opt (sb, DEBUG)) 498 printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, " 499 "bpg=%lu, ipg=%lu, mo=%04lx]\n", 500 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, 501 sbi->s_frag_size, 502 sbi->s_groups_count, 503 EXT2_BLOCKS_PER_GROUP(sb), 504 EXT2_INODES_PER_GROUP(sb), 505 sbi->s_mount_opt); 506 #ifdef CONFIG_EXT2_CHECK 507 if (test_opt (sb, CHECK)) { 508 ext2_check_blocks_bitmap (sb); 509 ext2_check_inodes_bitmap (sb); 510 } 511 #endif 512 return res; 513 } 514 515 static int ext2_check_descriptors (struct super_block * sb) 516 { 517 int i; 518 int desc_block = 0; 519 struct ext2_sb_info *sbi = EXT2_SB(sb); 520 unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block); 521 struct ext2_group_desc * gdp = NULL; 522 523 ext2_debug ("Checking group descriptors"); 524 525 for (i = 0; i < sbi->s_groups_count; i++) 526 { 527 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0) 528 gdp = (struct ext2_group_desc *) sbi->s_group_desc[desc_block++]->b_data; 529 if (le32_to_cpu(gdp->bg_block_bitmap) < block || 530 le32_to_cpu(gdp->bg_block_bitmap) >= block + EXT2_BLOCKS_PER_GROUP(sb)) 531 { 532 ext2_error (sb, "ext2_check_descriptors", 533 "Block bitmap for group %d" 534 " not in group (block %lu)!", 535 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); 536 return 0; 537 } 538 if (le32_to_cpu(gdp->bg_inode_bitmap) < block || 539 le32_to_cpu(gdp->bg_inode_bitmap) >= block + EXT2_BLOCKS_PER_GROUP(sb)) 540 { 541 ext2_error (sb, "ext2_check_descriptors", 542 "Inode bitmap for group %d" 543 " not in group (block %lu)!", 544 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); 545 return 0; 546 } 547 if (le32_to_cpu(gdp->bg_inode_table) < block || 548 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >= 549 block + EXT2_BLOCKS_PER_GROUP(sb)) 550 { 551 ext2_error (sb, "ext2_check_descriptors", 552 "Inode table for group %d" 553 " not in group (block %lu)!", 554 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); 555 return 0; 556 } 557 block += EXT2_BLOCKS_PER_GROUP(sb); 558 gdp++; 559 } 560 return 1; 561 } 562 563 #define log2(n) ffz(~(n)) 564 565 /* 566 * Maximal file size. There is a direct, and {,double-,triple-}indirect 567 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. 568 * We need to be 1 filesystem block less than the 2^32 sector limit. 569 */ 570 static loff_t ext2_max_size(int bits) 571 { 572 loff_t res = EXT2_NDIR_BLOCKS; 573 /* This constant is calculated to be the largest file size for a 574 * dense, 4k-blocksize file such that the total number of 575 * sectors in the file, including data and all indirect blocks, 576 * does not exceed 2^32. */ 577 const loff_t upper_limit = 0x1ff7fffd000LL; 578 579 res += 1LL << (bits-2); 580 res += 1LL << (2*(bits-2)); 581 res += 1LL << (3*(bits-2)); 582 res <<= bits; 583 if (res > upper_limit) 584 res = upper_limit; 585 return res; 586 } 587 588 static unsigned long descriptor_loc(struct super_block *sb, 589 unsigned long logic_sb_block, 590 int nr) 591 { 592 struct ext2_sb_info *sbi = EXT2_SB(sb); 593 unsigned long bg, first_data_block, first_meta_bg; 594 int has_super = 0; 595 596 first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block); 597 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 598 599 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || 600 nr < first_meta_bg) 601 return (logic_sb_block + nr + 1); 602 bg = sbi->s_desc_per_block * nr; 603 if (ext2_bg_has_super(sb, bg)) 604 has_super = 1; 605 return (first_data_block + has_super + (bg * sbi->s_blocks_per_group)); 606 } 607 608 static int ext2_fill_super(struct super_block *sb, void *data, int silent) 609 { 610 struct buffer_head * bh; 611 struct ext2_sb_info * sbi; 612 struct ext2_super_block * es; 613 struct inode *root; 614 unsigned long block; 615 unsigned long sb_block = get_sb_block(&data); 616 unsigned long logic_sb_block; 617 unsigned long offset = 0; 618 unsigned long def_mount_opts; 619 int blocksize = BLOCK_SIZE; 620 int db_count; 621 int i, j; 622 __le32 features; 623 624 sbi = kmalloc(sizeof(*sbi), GFP_KERNEL); 625 if (!sbi) 626 return -ENOMEM; 627 sb->s_fs_info = sbi; 628 memset(sbi, 0, sizeof(*sbi)); 629 630 /* 631 * See what the current blocksize for the device is, and 632 * use that as the blocksize. Otherwise (or if the blocksize 633 * is smaller than the default) use the default. 634 * This is important for devices that have a hardware 635 * sectorsize that is larger than the default. 636 */ 637 blocksize = sb_min_blocksize(sb, BLOCK_SIZE); 638 if (!blocksize) { 639 printk ("EXT2-fs: unable to set blocksize\n"); 640 goto failed_sbi; 641 } 642 643 /* 644 * If the superblock doesn't start on a hardware sector boundary, 645 * calculate the offset. 646 */ 647 if (blocksize != BLOCK_SIZE) { 648 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 649 offset = (sb_block*BLOCK_SIZE) % blocksize; 650 } else { 651 logic_sb_block = sb_block; 652 } 653 654 if (!(bh = sb_bread(sb, logic_sb_block))) { 655 printk ("EXT2-fs: unable to read superblock\n"); 656 goto failed_sbi; 657 } 658 /* 659 * Note: s_es must be initialized as soon as possible because 660 * some ext2 macro-instructions depend on its value 661 */ 662 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 663 sbi->s_es = es; 664 sb->s_magic = le16_to_cpu(es->s_magic); 665 666 if (sb->s_magic != EXT2_SUPER_MAGIC) 667 goto cantfind_ext2; 668 669 /* Set defaults before we parse the mount options */ 670 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 671 if (def_mount_opts & EXT2_DEFM_DEBUG) 672 set_opt(sbi->s_mount_opt, DEBUG); 673 if (def_mount_opts & EXT2_DEFM_BSDGROUPS) 674 set_opt(sbi->s_mount_opt, GRPID); 675 if (def_mount_opts & EXT2_DEFM_UID16) 676 set_opt(sbi->s_mount_opt, NO_UID32); 677 if (def_mount_opts & EXT2_DEFM_XATTR_USER) 678 set_opt(sbi->s_mount_opt, XATTR_USER); 679 if (def_mount_opts & EXT2_DEFM_ACL) 680 set_opt(sbi->s_mount_opt, POSIX_ACL); 681 682 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) 683 set_opt(sbi->s_mount_opt, ERRORS_PANIC); 684 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_RO) 685 set_opt(sbi->s_mount_opt, ERRORS_RO); 686 687 sbi->s_resuid = le16_to_cpu(es->s_def_resuid); 688 sbi->s_resgid = le16_to_cpu(es->s_def_resgid); 689 690 if (!parse_options ((char *) data, sbi)) 691 goto failed_mount; 692 693 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 694 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? 695 MS_POSIXACL : 0); 696 697 ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset 698 EXT2_MOUNT_XIP if not */ 699 700 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && 701 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || 702 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 703 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) 704 printk("EXT2-fs warning: feature flags set on rev 0 fs, " 705 "running e2fsck is recommended\n"); 706 /* 707 * Check feature flags regardless of the revision level, since we 708 * previously didn't change the revision level when setting the flags, 709 * so there is a chance incompat flags are set on a rev 0 filesystem. 710 */ 711 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); 712 if (features) { 713 printk("EXT2-fs: %s: couldn't mount because of " 714 "unsupported optional features (%x).\n", 715 sb->s_id, le32_to_cpu(features)); 716 goto failed_mount; 717 } 718 if (!(sb->s_flags & MS_RDONLY) && 719 (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ 720 printk("EXT2-fs: %s: couldn't mount RDWR because of " 721 "unsupported optional features (%x).\n", 722 sb->s_id, le32_to_cpu(features)); 723 goto failed_mount; 724 } 725 726 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); 727 728 if ((ext2_use_xip(sb)) && ((blocksize != PAGE_SIZE) || 729 (sb->s_blocksize != blocksize))) { 730 if (!silent) 731 printk("XIP: Unsupported blocksize\n"); 732 goto failed_mount; 733 } 734 735 /* If the blocksize doesn't match, re-read the thing.. */ 736 if (sb->s_blocksize != blocksize) { 737 brelse(bh); 738 739 if (!sb_set_blocksize(sb, blocksize)) { 740 printk(KERN_ERR "EXT2-fs: blocksize too small for device.\n"); 741 goto failed_sbi; 742 } 743 744 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 745 offset = (sb_block*BLOCK_SIZE) % blocksize; 746 bh = sb_bread(sb, logic_sb_block); 747 if(!bh) { 748 printk("EXT2-fs: Couldn't read superblock on " 749 "2nd try.\n"); 750 goto failed_sbi; 751 } 752 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 753 sbi->s_es = es; 754 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { 755 printk ("EXT2-fs: Magic mismatch, very weird !\n"); 756 goto failed_mount; 757 } 758 } 759 760 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); 761 762 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { 763 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; 764 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; 765 } else { 766 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 767 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 768 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || 769 (sbi->s_inode_size & (sbi->s_inode_size - 1)) || 770 (sbi->s_inode_size > blocksize)) { 771 printk ("EXT2-fs: unsupported inode size: %d\n", 772 sbi->s_inode_size); 773 goto failed_mount; 774 } 775 } 776 777 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << 778 le32_to_cpu(es->s_log_frag_size); 779 if (sbi->s_frag_size == 0) 780 goto cantfind_ext2; 781 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; 782 783 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 784 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); 785 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 786 787 if (EXT2_INODE_SIZE(sb) == 0) 788 goto cantfind_ext2; 789 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); 790 if (sbi->s_inodes_per_block == 0) 791 goto cantfind_ext2; 792 sbi->s_itb_per_group = sbi->s_inodes_per_group / 793 sbi->s_inodes_per_block; 794 sbi->s_desc_per_block = sb->s_blocksize / 795 sizeof (struct ext2_group_desc); 796 sbi->s_sbh = bh; 797 sbi->s_mount_state = le16_to_cpu(es->s_state); 798 sbi->s_addr_per_block_bits = 799 log2 (EXT2_ADDR_PER_BLOCK(sb)); 800 sbi->s_desc_per_block_bits = 801 log2 (EXT2_DESC_PER_BLOCK(sb)); 802 803 if (sb->s_magic != EXT2_SUPER_MAGIC) 804 goto cantfind_ext2; 805 806 if (sb->s_blocksize != bh->b_size) { 807 if (!silent) 808 printk ("VFS: Unsupported blocksize on dev " 809 "%s.\n", sb->s_id); 810 goto failed_mount; 811 } 812 813 if (sb->s_blocksize != sbi->s_frag_size) { 814 printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n", 815 sbi->s_frag_size, sb->s_blocksize); 816 goto failed_mount; 817 } 818 819 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { 820 printk ("EXT2-fs: #blocks per group too big: %lu\n", 821 sbi->s_blocks_per_group); 822 goto failed_mount; 823 } 824 if (sbi->s_frags_per_group > sb->s_blocksize * 8) { 825 printk ("EXT2-fs: #fragments per group too big: %lu\n", 826 sbi->s_frags_per_group); 827 goto failed_mount; 828 } 829 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { 830 printk ("EXT2-fs: #inodes per group too big: %lu\n", 831 sbi->s_inodes_per_group); 832 goto failed_mount; 833 } 834 835 if (EXT2_BLOCKS_PER_GROUP(sb) == 0) 836 goto cantfind_ext2; 837 sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) - 838 le32_to_cpu(es->s_first_data_block) + 839 EXT2_BLOCKS_PER_GROUP(sb) - 1) / 840 EXT2_BLOCKS_PER_GROUP(sb); 841 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / 842 EXT2_DESC_PER_BLOCK(sb); 843 sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL); 844 if (sbi->s_group_desc == NULL) { 845 printk ("EXT2-fs: not enough memory\n"); 846 goto failed_mount; 847 } 848 percpu_counter_init(&sbi->s_freeblocks_counter); 849 percpu_counter_init(&sbi->s_freeinodes_counter); 850 percpu_counter_init(&sbi->s_dirs_counter); 851 bgl_lock_init(&sbi->s_blockgroup_lock); 852 sbi->s_debts = kmalloc(sbi->s_groups_count * sizeof(*sbi->s_debts), 853 GFP_KERNEL); 854 if (!sbi->s_debts) { 855 printk ("EXT2-fs: not enough memory\n"); 856 goto failed_mount_group_desc; 857 } 858 memset(sbi->s_debts, 0, sbi->s_groups_count * sizeof(*sbi->s_debts)); 859 for (i = 0; i < db_count; i++) { 860 block = descriptor_loc(sb, logic_sb_block, i); 861 sbi->s_group_desc[i] = sb_bread(sb, block); 862 if (!sbi->s_group_desc[i]) { 863 for (j = 0; j < i; j++) 864 brelse (sbi->s_group_desc[j]); 865 printk ("EXT2-fs: unable to read group descriptors\n"); 866 goto failed_mount_group_desc; 867 } 868 } 869 if (!ext2_check_descriptors (sb)) { 870 printk ("EXT2-fs: group descriptors corrupted!\n"); 871 db_count = i; 872 goto failed_mount2; 873 } 874 sbi->s_gdb_count = db_count; 875 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 876 spin_lock_init(&sbi->s_next_gen_lock); 877 /* 878 * set up enough so that it can read an inode 879 */ 880 sb->s_op = &ext2_sops; 881 sb->s_export_op = &ext2_export_ops; 882 sb->s_xattr = ext2_xattr_handlers; 883 root = iget(sb, EXT2_ROOT_INO); 884 sb->s_root = d_alloc_root(root); 885 if (!sb->s_root) { 886 iput(root); 887 printk(KERN_ERR "EXT2-fs: get root inode failed\n"); 888 goto failed_mount2; 889 } 890 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 891 dput(sb->s_root); 892 sb->s_root = NULL; 893 printk(KERN_ERR "EXT2-fs: corrupt root inode, run e2fsck\n"); 894 goto failed_mount2; 895 } 896 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 897 ext2_warning(sb, __FUNCTION__, 898 "mounting ext3 filesystem as ext2\n"); 899 ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY); 900 percpu_counter_mod(&sbi->s_freeblocks_counter, 901 ext2_count_free_blocks(sb)); 902 percpu_counter_mod(&sbi->s_freeinodes_counter, 903 ext2_count_free_inodes(sb)); 904 percpu_counter_mod(&sbi->s_dirs_counter, 905 ext2_count_dirs(sb)); 906 return 0; 907 908 cantfind_ext2: 909 if (!silent) 910 printk("VFS: Can't find an ext2 filesystem on dev %s.\n", 911 sb->s_id); 912 goto failed_mount; 913 914 failed_mount2: 915 for (i = 0; i < db_count; i++) 916 brelse(sbi->s_group_desc[i]); 917 failed_mount_group_desc: 918 kfree(sbi->s_group_desc); 919 kfree(sbi->s_debts); 920 failed_mount: 921 brelse(bh); 922 failed_sbi: 923 sb->s_fs_info = NULL; 924 kfree(sbi); 925 return -EINVAL; 926 } 927 928 static void ext2_commit_super (struct super_block * sb, 929 struct ext2_super_block * es) 930 { 931 es->s_wtime = cpu_to_le32(get_seconds()); 932 mark_buffer_dirty(EXT2_SB(sb)->s_sbh); 933 sb->s_dirt = 0; 934 } 935 936 static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es) 937 { 938 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); 939 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); 940 es->s_wtime = cpu_to_le32(get_seconds()); 941 mark_buffer_dirty(EXT2_SB(sb)->s_sbh); 942 sync_dirty_buffer(EXT2_SB(sb)->s_sbh); 943 sb->s_dirt = 0; 944 } 945 946 /* 947 * In the second extended file system, it is not necessary to 948 * write the super block since we use a mapping of the 949 * disk super block in a buffer. 950 * 951 * However, this function is still used to set the fs valid 952 * flags to 0. We need to set this flag to 0 since the fs 953 * may have been checked while mounted and e2fsck may have 954 * set s_state to EXT2_VALID_FS after some corrections. 955 */ 956 957 void ext2_write_super (struct super_block * sb) 958 { 959 struct ext2_super_block * es; 960 lock_kernel(); 961 if (!(sb->s_flags & MS_RDONLY)) { 962 es = EXT2_SB(sb)->s_es; 963 964 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS) { 965 ext2_debug ("setting valid to 0\n"); 966 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & 967 ~EXT2_VALID_FS); 968 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); 969 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); 970 es->s_mtime = cpu_to_le32(get_seconds()); 971 ext2_sync_super(sb, es); 972 } else 973 ext2_commit_super (sb, es); 974 } 975 sb->s_dirt = 0; 976 unlock_kernel(); 977 } 978 979 static int ext2_remount (struct super_block * sb, int * flags, char * data) 980 { 981 struct ext2_sb_info * sbi = EXT2_SB(sb); 982 struct ext2_super_block * es; 983 unsigned long old_mount_opt = sbi->s_mount_opt; 984 struct ext2_mount_options old_opts; 985 unsigned long old_sb_flags; 986 int err; 987 988 /* Store the old options */ 989 old_sb_flags = sb->s_flags; 990 old_opts.s_mount_opt = sbi->s_mount_opt; 991 old_opts.s_resuid = sbi->s_resuid; 992 old_opts.s_resgid = sbi->s_resgid; 993 994 /* 995 * Allow the "check" option to be passed as a remount option. 996 */ 997 if (!parse_options (data, sbi)) { 998 err = -EINVAL; 999 goto restore_opts; 1000 } 1001 1002 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 1003 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 1004 1005 es = sbi->s_es; 1006 if (((sbi->s_mount_opt & EXT2_MOUNT_XIP) != 1007 (old_mount_opt & EXT2_MOUNT_XIP)) && 1008 invalidate_inodes(sb)) 1009 ext2_warning(sb, __FUNCTION__, "busy inodes while remounting "\ 1010 "xip remain in cache (no functional problem)"); 1011 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 1012 return 0; 1013 if (*flags & MS_RDONLY) { 1014 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || 1015 !(sbi->s_mount_state & EXT2_VALID_FS)) 1016 return 0; 1017 /* 1018 * OK, we are remounting a valid rw partition rdonly, so set 1019 * the rdonly flag and then mark the partition as valid again. 1020 */ 1021 es->s_state = cpu_to_le16(sbi->s_mount_state); 1022 es->s_mtime = cpu_to_le32(get_seconds()); 1023 } else { 1024 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, 1025 ~EXT2_FEATURE_RO_COMPAT_SUPP); 1026 if (ret) { 1027 printk("EXT2-fs: %s: couldn't remount RDWR because of " 1028 "unsupported optional features (%x).\n", 1029 sb->s_id, le32_to_cpu(ret)); 1030 err = -EROFS; 1031 goto restore_opts; 1032 } 1033 /* 1034 * Mounting a RDONLY partition read-write, so reread and 1035 * store the current valid flag. (It may have been changed 1036 * by e2fsck since we originally mounted the partition.) 1037 */ 1038 sbi->s_mount_state = le16_to_cpu(es->s_state); 1039 if (!ext2_setup_super (sb, es, 0)) 1040 sb->s_flags &= ~MS_RDONLY; 1041 } 1042 ext2_sync_super(sb, es); 1043 return 0; 1044 restore_opts: 1045 sbi->s_mount_opt = old_opts.s_mount_opt; 1046 sbi->s_resuid = old_opts.s_resuid; 1047 sbi->s_resgid = old_opts.s_resgid; 1048 sb->s_flags = old_sb_flags; 1049 return err; 1050 } 1051 1052 static int ext2_statfs (struct super_block * sb, struct kstatfs * buf) 1053 { 1054 struct ext2_sb_info *sbi = EXT2_SB(sb); 1055 unsigned long overhead; 1056 int i; 1057 1058 if (test_opt (sb, MINIX_DF)) 1059 overhead = 0; 1060 else { 1061 /* 1062 * Compute the overhead (FS structures) 1063 */ 1064 1065 /* 1066 * All of the blocks before first_data_block are 1067 * overhead 1068 */ 1069 overhead = le32_to_cpu(sbi->s_es->s_first_data_block); 1070 1071 /* 1072 * Add the overhead attributed to the superblock and 1073 * block group descriptors. If the sparse superblocks 1074 * feature is turned on, then not all groups have this. 1075 */ 1076 for (i = 0; i < sbi->s_groups_count; i++) 1077 overhead += ext2_bg_has_super(sb, i) + 1078 ext2_bg_num_gdb(sb, i); 1079 1080 /* 1081 * Every block group has an inode bitmap, a block 1082 * bitmap, and an inode table. 1083 */ 1084 overhead += (sbi->s_groups_count * 1085 (2 + sbi->s_itb_per_group)); 1086 } 1087 1088 buf->f_type = EXT2_SUPER_MAGIC; 1089 buf->f_bsize = sb->s_blocksize; 1090 buf->f_blocks = le32_to_cpu(sbi->s_es->s_blocks_count) - overhead; 1091 buf->f_bfree = ext2_count_free_blocks(sb); 1092 buf->f_bavail = buf->f_bfree - le32_to_cpu(sbi->s_es->s_r_blocks_count); 1093 if (buf->f_bfree < le32_to_cpu(sbi->s_es->s_r_blocks_count)) 1094 buf->f_bavail = 0; 1095 buf->f_files = le32_to_cpu(sbi->s_es->s_inodes_count); 1096 buf->f_ffree = ext2_count_free_inodes (sb); 1097 buf->f_namelen = EXT2_NAME_LEN; 1098 return 0; 1099 } 1100 1101 static struct super_block *ext2_get_sb(struct file_system_type *fs_type, 1102 int flags, const char *dev_name, void *data) 1103 { 1104 return get_sb_bdev(fs_type, flags, dev_name, data, ext2_fill_super); 1105 } 1106 1107 #ifdef CONFIG_QUOTA 1108 1109 /* Read data from quotafile - avoid pagecache and such because we cannot afford 1110 * acquiring the locks... As quota files are never truncated and quota code 1111 * itself serializes the operations (and noone else should touch the files) 1112 * we don't have to be afraid of races */ 1113 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, 1114 size_t len, loff_t off) 1115 { 1116 struct inode *inode = sb_dqopt(sb)->files[type]; 1117 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1118 int err = 0; 1119 int offset = off & (sb->s_blocksize - 1); 1120 int tocopy; 1121 size_t toread; 1122 struct buffer_head tmp_bh; 1123 struct buffer_head *bh; 1124 loff_t i_size = i_size_read(inode); 1125 1126 if (off > i_size) 1127 return 0; 1128 if (off+len > i_size) 1129 len = i_size-off; 1130 toread = len; 1131 while (toread > 0) { 1132 tocopy = sb->s_blocksize - offset < toread ? 1133 sb->s_blocksize - offset : toread; 1134 1135 tmp_bh.b_state = 0; 1136 err = ext2_get_block(inode, blk, &tmp_bh, 0); 1137 if (err) 1138 return err; 1139 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 1140 memset(data, 0, tocopy); 1141 else { 1142 bh = sb_bread(sb, tmp_bh.b_blocknr); 1143 if (!bh) 1144 return -EIO; 1145 memcpy(data, bh->b_data+offset, tocopy); 1146 brelse(bh); 1147 } 1148 offset = 0; 1149 toread -= tocopy; 1150 data += tocopy; 1151 blk++; 1152 } 1153 return len; 1154 } 1155 1156 /* Write to quotafile */ 1157 static ssize_t ext2_quota_write(struct super_block *sb, int type, 1158 const char *data, size_t len, loff_t off) 1159 { 1160 struct inode *inode = sb_dqopt(sb)->files[type]; 1161 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1162 int err = 0; 1163 int offset = off & (sb->s_blocksize - 1); 1164 int tocopy; 1165 size_t towrite = len; 1166 struct buffer_head tmp_bh; 1167 struct buffer_head *bh; 1168 1169 down(&inode->i_sem); 1170 while (towrite > 0) { 1171 tocopy = sb->s_blocksize - offset < towrite ? 1172 sb->s_blocksize - offset : towrite; 1173 1174 tmp_bh.b_state = 0; 1175 err = ext2_get_block(inode, blk, &tmp_bh, 1); 1176 if (err) 1177 goto out; 1178 if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) 1179 bh = sb_bread(sb, tmp_bh.b_blocknr); 1180 else 1181 bh = sb_getblk(sb, tmp_bh.b_blocknr); 1182 if (!bh) { 1183 err = -EIO; 1184 goto out; 1185 } 1186 lock_buffer(bh); 1187 memcpy(bh->b_data+offset, data, tocopy); 1188 flush_dcache_page(bh->b_page); 1189 set_buffer_uptodate(bh); 1190 mark_buffer_dirty(bh); 1191 unlock_buffer(bh); 1192 brelse(bh); 1193 offset = 0; 1194 towrite -= tocopy; 1195 data += tocopy; 1196 blk++; 1197 } 1198 out: 1199 if (len == towrite) 1200 return err; 1201 if (inode->i_size < off+len-towrite) 1202 i_size_write(inode, off+len-towrite); 1203 inode->i_version++; 1204 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 1205 mark_inode_dirty(inode); 1206 up(&inode->i_sem); 1207 return len - towrite; 1208 } 1209 1210 #endif 1211 1212 static struct file_system_type ext2_fs_type = { 1213 .owner = THIS_MODULE, 1214 .name = "ext2", 1215 .get_sb = ext2_get_sb, 1216 .kill_sb = kill_block_super, 1217 .fs_flags = FS_REQUIRES_DEV, 1218 }; 1219 1220 static int __init init_ext2_fs(void) 1221 { 1222 int err = init_ext2_xattr(); 1223 if (err) 1224 return err; 1225 err = init_inodecache(); 1226 if (err) 1227 goto out1; 1228 err = register_filesystem(&ext2_fs_type); 1229 if (err) 1230 goto out; 1231 return 0; 1232 out: 1233 destroy_inodecache(); 1234 out1: 1235 exit_ext2_xattr(); 1236 return err; 1237 } 1238 1239 static void __exit exit_ext2_fs(void) 1240 { 1241 unregister_filesystem(&ext2_fs_type); 1242 destroy_inodecache(); 1243 exit_ext2_xattr(); 1244 } 1245 1246 module_init(init_ext2_fs) 1247 module_exit(exit_ext2_fs) 1248