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 struct kmem_cache * 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, GFP_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, struct kmem_cache * 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 kmem_cache_destroy(ext2_inode_cachep); 188 } 189 190 static void ext2_clear_inode(struct inode *inode) 191 { 192 #ifdef CONFIG_EXT2_FS_POSIX_ACL 193 struct ext2_inode_info *ei = EXT2_I(inode); 194 195 if (ei->i_acl && ei->i_acl != EXT2_ACL_NOT_CACHED) { 196 posix_acl_release(ei->i_acl); 197 ei->i_acl = EXT2_ACL_NOT_CACHED; 198 } 199 if (ei->i_default_acl && ei->i_default_acl != EXT2_ACL_NOT_CACHED) { 200 posix_acl_release(ei->i_default_acl); 201 ei->i_default_acl = EXT2_ACL_NOT_CACHED; 202 } 203 #endif 204 } 205 206 static int ext2_show_options(struct seq_file *seq, struct vfsmount *vfs) 207 { 208 struct ext2_sb_info *sbi = EXT2_SB(vfs->mnt_sb); 209 210 if (sbi->s_mount_opt & EXT2_MOUNT_GRPID) 211 seq_puts(seq, ",grpid"); 212 213 #if defined(CONFIG_QUOTA) 214 if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA) 215 seq_puts(seq, ",usrquota"); 216 217 if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA) 218 seq_puts(seq, ",grpquota"); 219 #endif 220 221 #if defined(CONFIG_EXT2_FS_XIP) 222 if (sbi->s_mount_opt & EXT2_MOUNT_XIP) 223 seq_puts(seq, ",xip"); 224 #endif 225 226 return 0; 227 } 228 229 #ifdef CONFIG_QUOTA 230 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); 231 static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); 232 #endif 233 234 static const struct super_operations ext2_sops = { 235 .alloc_inode = ext2_alloc_inode, 236 .destroy_inode = ext2_destroy_inode, 237 .read_inode = ext2_read_inode, 238 .write_inode = ext2_write_inode, 239 .put_inode = ext2_put_inode, 240 .delete_inode = ext2_delete_inode, 241 .put_super = ext2_put_super, 242 .write_super = ext2_write_super, 243 .statfs = ext2_statfs, 244 .remount_fs = ext2_remount, 245 .clear_inode = ext2_clear_inode, 246 .show_options = ext2_show_options, 247 #ifdef CONFIG_QUOTA 248 .quota_read = ext2_quota_read, 249 .quota_write = ext2_quota_write, 250 #endif 251 }; 252 253 static struct dentry *ext2_get_dentry(struct super_block *sb, void *vobjp) 254 { 255 __u32 *objp = vobjp; 256 unsigned long ino = objp[0]; 257 __u32 generation = objp[1]; 258 struct inode *inode; 259 struct dentry *result; 260 261 if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) 262 return ERR_PTR(-ESTALE); 263 if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) 264 return ERR_PTR(-ESTALE); 265 266 /* iget isn't really right if the inode is currently unallocated!! 267 * ext2_read_inode currently does appropriate checks, but 268 * it might be "neater" to call ext2_get_inode first and check 269 * if the inode is valid..... 270 */ 271 inode = iget(sb, ino); 272 if (inode == NULL) 273 return ERR_PTR(-ENOMEM); 274 if (is_bad_inode(inode) || 275 (generation && inode->i_generation != generation)) { 276 /* we didn't find the right inode.. */ 277 iput(inode); 278 return ERR_PTR(-ESTALE); 279 } 280 /* now to find a dentry. 281 * If possible, get a well-connected one 282 */ 283 result = d_alloc_anon(inode); 284 if (!result) { 285 iput(inode); 286 return ERR_PTR(-ENOMEM); 287 } 288 return result; 289 } 290 291 /* Yes, most of these are left as NULL!! 292 * A NULL value implies the default, which works with ext2-like file 293 * systems, but can be improved upon. 294 * Currently only get_parent is required. 295 */ 296 static struct export_operations ext2_export_ops = { 297 .get_parent = ext2_get_parent, 298 .get_dentry = ext2_get_dentry, 299 }; 300 301 static unsigned long get_sb_block(void **data) 302 { 303 unsigned long sb_block; 304 char *options = (char *) *data; 305 306 if (!options || strncmp(options, "sb=", 3) != 0) 307 return 1; /* Default location */ 308 options += 3; 309 sb_block = simple_strtoul(options, &options, 0); 310 if (*options && *options != ',') { 311 printk("EXT2-fs: Invalid sb specification: %s\n", 312 (char *) *data); 313 return 1; 314 } 315 if (*options == ',') 316 options++; 317 *data = (void *) options; 318 return sb_block; 319 } 320 321 enum { 322 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, 323 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, 324 Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug, 325 Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, 326 Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota, 327 Opt_usrquota, Opt_grpquota 328 }; 329 330 static match_table_t tokens = { 331 {Opt_bsd_df, "bsddf"}, 332 {Opt_minix_df, "minixdf"}, 333 {Opt_grpid, "grpid"}, 334 {Opt_grpid, "bsdgroups"}, 335 {Opt_nogrpid, "nogrpid"}, 336 {Opt_nogrpid, "sysvgroups"}, 337 {Opt_resgid, "resgid=%u"}, 338 {Opt_resuid, "resuid=%u"}, 339 {Opt_sb, "sb=%u"}, 340 {Opt_err_cont, "errors=continue"}, 341 {Opt_err_panic, "errors=panic"}, 342 {Opt_err_ro, "errors=remount-ro"}, 343 {Opt_nouid32, "nouid32"}, 344 {Opt_nocheck, "check=none"}, 345 {Opt_nocheck, "nocheck"}, 346 {Opt_debug, "debug"}, 347 {Opt_oldalloc, "oldalloc"}, 348 {Opt_orlov, "orlov"}, 349 {Opt_nobh, "nobh"}, 350 {Opt_user_xattr, "user_xattr"}, 351 {Opt_nouser_xattr, "nouser_xattr"}, 352 {Opt_acl, "acl"}, 353 {Opt_noacl, "noacl"}, 354 {Opt_xip, "xip"}, 355 {Opt_grpquota, "grpquota"}, 356 {Opt_ignore, "noquota"}, 357 {Opt_quota, "quota"}, 358 {Opt_usrquota, "usrquota"}, 359 {Opt_err, NULL} 360 }; 361 362 static int parse_options (char * options, 363 struct ext2_sb_info *sbi) 364 { 365 char * p; 366 substring_t args[MAX_OPT_ARGS]; 367 int option; 368 369 if (!options) 370 return 1; 371 372 while ((p = strsep (&options, ",")) != NULL) { 373 int token; 374 if (!*p) 375 continue; 376 377 token = match_token(p, tokens, args); 378 switch (token) { 379 case Opt_bsd_df: 380 clear_opt (sbi->s_mount_opt, MINIX_DF); 381 break; 382 case Opt_minix_df: 383 set_opt (sbi->s_mount_opt, MINIX_DF); 384 break; 385 case Opt_grpid: 386 set_opt (sbi->s_mount_opt, GRPID); 387 break; 388 case Opt_nogrpid: 389 clear_opt (sbi->s_mount_opt, GRPID); 390 break; 391 case Opt_resuid: 392 if (match_int(&args[0], &option)) 393 return 0; 394 sbi->s_resuid = option; 395 break; 396 case Opt_resgid: 397 if (match_int(&args[0], &option)) 398 return 0; 399 sbi->s_resgid = option; 400 break; 401 case Opt_sb: 402 /* handled by get_sb_block() instead of here */ 403 /* *sb_block = match_int(&args[0]); */ 404 break; 405 case Opt_err_panic: 406 clear_opt (sbi->s_mount_opt, ERRORS_CONT); 407 clear_opt (sbi->s_mount_opt, ERRORS_RO); 408 set_opt (sbi->s_mount_opt, ERRORS_PANIC); 409 break; 410 case Opt_err_ro: 411 clear_opt (sbi->s_mount_opt, ERRORS_CONT); 412 clear_opt (sbi->s_mount_opt, ERRORS_PANIC); 413 set_opt (sbi->s_mount_opt, ERRORS_RO); 414 break; 415 case Opt_err_cont: 416 clear_opt (sbi->s_mount_opt, ERRORS_RO); 417 clear_opt (sbi->s_mount_opt, ERRORS_PANIC); 418 set_opt (sbi->s_mount_opt, ERRORS_CONT); 419 break; 420 case Opt_nouid32: 421 set_opt (sbi->s_mount_opt, NO_UID32); 422 break; 423 case Opt_nocheck: 424 clear_opt (sbi->s_mount_opt, CHECK); 425 break; 426 case Opt_debug: 427 set_opt (sbi->s_mount_opt, DEBUG); 428 break; 429 case Opt_oldalloc: 430 set_opt (sbi->s_mount_opt, OLDALLOC); 431 break; 432 case Opt_orlov: 433 clear_opt (sbi->s_mount_opt, OLDALLOC); 434 break; 435 case Opt_nobh: 436 set_opt (sbi->s_mount_opt, NOBH); 437 break; 438 #ifdef CONFIG_EXT2_FS_XATTR 439 case Opt_user_xattr: 440 set_opt (sbi->s_mount_opt, XATTR_USER); 441 break; 442 case Opt_nouser_xattr: 443 clear_opt (sbi->s_mount_opt, XATTR_USER); 444 break; 445 #else 446 case Opt_user_xattr: 447 case Opt_nouser_xattr: 448 printk("EXT2 (no)user_xattr options not supported\n"); 449 break; 450 #endif 451 #ifdef CONFIG_EXT2_FS_POSIX_ACL 452 case Opt_acl: 453 set_opt(sbi->s_mount_opt, POSIX_ACL); 454 break; 455 case Opt_noacl: 456 clear_opt(sbi->s_mount_opt, POSIX_ACL); 457 break; 458 #else 459 case Opt_acl: 460 case Opt_noacl: 461 printk("EXT2 (no)acl options not supported\n"); 462 break; 463 #endif 464 case Opt_xip: 465 #ifdef CONFIG_EXT2_FS_XIP 466 set_opt (sbi->s_mount_opt, XIP); 467 #else 468 printk("EXT2 xip option not supported\n"); 469 #endif 470 break; 471 472 #if defined(CONFIG_QUOTA) 473 case Opt_quota: 474 case Opt_usrquota: 475 set_opt(sbi->s_mount_opt, USRQUOTA); 476 break; 477 478 case Opt_grpquota: 479 set_opt(sbi->s_mount_opt, GRPQUOTA); 480 break; 481 #else 482 case Opt_quota: 483 case Opt_usrquota: 484 case Opt_grpquota: 485 printk(KERN_ERR 486 "EXT2-fs: quota operations not supported.\n"); 487 488 break; 489 #endif 490 491 case Opt_ignore: 492 break; 493 default: 494 return 0; 495 } 496 } 497 return 1; 498 } 499 500 static int ext2_setup_super (struct super_block * sb, 501 struct ext2_super_block * es, 502 int read_only) 503 { 504 int res = 0; 505 struct ext2_sb_info *sbi = EXT2_SB(sb); 506 507 if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { 508 printk ("EXT2-fs warning: revision level too high, " 509 "forcing read-only mode\n"); 510 res = MS_RDONLY; 511 } 512 if (read_only) 513 return res; 514 if (!(sbi->s_mount_state & EXT2_VALID_FS)) 515 printk ("EXT2-fs warning: mounting unchecked fs, " 516 "running e2fsck is recommended\n"); 517 else if ((sbi->s_mount_state & EXT2_ERROR_FS)) 518 printk ("EXT2-fs warning: mounting fs with errors, " 519 "running e2fsck is recommended\n"); 520 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && 521 le16_to_cpu(es->s_mnt_count) >= 522 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) 523 printk ("EXT2-fs warning: maximal mount count reached, " 524 "running e2fsck is recommended\n"); 525 else if (le32_to_cpu(es->s_checkinterval) && 526 (le32_to_cpu(es->s_lastcheck) + le32_to_cpu(es->s_checkinterval) <= get_seconds())) 527 printk ("EXT2-fs warning: checktime reached, " 528 "running e2fsck is recommended\n"); 529 if (!le16_to_cpu(es->s_max_mnt_count)) 530 es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); 531 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1); 532 ext2_write_super(sb); 533 if (test_opt (sb, DEBUG)) 534 printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, " 535 "bpg=%lu, ipg=%lu, mo=%04lx]\n", 536 EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, 537 sbi->s_frag_size, 538 sbi->s_groups_count, 539 EXT2_BLOCKS_PER_GROUP(sb), 540 EXT2_INODES_PER_GROUP(sb), 541 sbi->s_mount_opt); 542 return res; 543 } 544 545 static int ext2_check_descriptors (struct super_block * sb) 546 { 547 int i; 548 int desc_block = 0; 549 struct ext2_sb_info *sbi = EXT2_SB(sb); 550 unsigned long first_block = le32_to_cpu(sbi->s_es->s_first_data_block); 551 unsigned long last_block; 552 struct ext2_group_desc * gdp = NULL; 553 554 ext2_debug ("Checking group descriptors"); 555 556 for (i = 0; i < sbi->s_groups_count; i++) 557 { 558 if (i == sbi->s_groups_count - 1) 559 last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; 560 else 561 last_block = first_block + 562 (EXT2_BLOCKS_PER_GROUP(sb) - 1); 563 564 if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0) 565 gdp = (struct ext2_group_desc *) sbi->s_group_desc[desc_block++]->b_data; 566 if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || 567 le32_to_cpu(gdp->bg_block_bitmap) > last_block) 568 { 569 ext2_error (sb, "ext2_check_descriptors", 570 "Block bitmap for group %d" 571 " not in group (block %lu)!", 572 i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); 573 return 0; 574 } 575 if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || 576 le32_to_cpu(gdp->bg_inode_bitmap) > last_block) 577 { 578 ext2_error (sb, "ext2_check_descriptors", 579 "Inode bitmap for group %d" 580 " not in group (block %lu)!", 581 i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); 582 return 0; 583 } 584 if (le32_to_cpu(gdp->bg_inode_table) < first_block || 585 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group > 586 last_block) 587 { 588 ext2_error (sb, "ext2_check_descriptors", 589 "Inode table for group %d" 590 " not in group (block %lu)!", 591 i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); 592 return 0; 593 } 594 first_block += EXT2_BLOCKS_PER_GROUP(sb); 595 gdp++; 596 } 597 return 1; 598 } 599 600 /* 601 * Maximal file size. There is a direct, and {,double-,triple-}indirect 602 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. 603 * We need to be 1 filesystem block less than the 2^32 sector limit. 604 */ 605 static loff_t ext2_max_size(int bits) 606 { 607 loff_t res = EXT2_NDIR_BLOCKS; 608 /* This constant is calculated to be the largest file size for a 609 * dense, 4k-blocksize file such that the total number of 610 * sectors in the file, including data and all indirect blocks, 611 * does not exceed 2^32. */ 612 const loff_t upper_limit = 0x1ff7fffd000LL; 613 614 res += 1LL << (bits-2); 615 res += 1LL << (2*(bits-2)); 616 res += 1LL << (3*(bits-2)); 617 res <<= bits; 618 if (res > upper_limit) 619 res = upper_limit; 620 return res; 621 } 622 623 static unsigned long descriptor_loc(struct super_block *sb, 624 unsigned long logic_sb_block, 625 int nr) 626 { 627 struct ext2_sb_info *sbi = EXT2_SB(sb); 628 unsigned long bg, first_data_block, first_meta_bg; 629 int has_super = 0; 630 631 first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block); 632 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); 633 634 if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || 635 nr < first_meta_bg) 636 return (logic_sb_block + nr + 1); 637 bg = sbi->s_desc_per_block * nr; 638 if (ext2_bg_has_super(sb, bg)) 639 has_super = 1; 640 return (first_data_block + has_super + (bg * sbi->s_blocks_per_group)); 641 } 642 643 static int ext2_fill_super(struct super_block *sb, void *data, int silent) 644 { 645 struct buffer_head * bh; 646 struct ext2_sb_info * sbi; 647 struct ext2_super_block * es; 648 struct inode *root; 649 unsigned long block; 650 unsigned long sb_block = get_sb_block(&data); 651 unsigned long logic_sb_block; 652 unsigned long offset = 0; 653 unsigned long def_mount_opts; 654 int blocksize = BLOCK_SIZE; 655 int db_count; 656 int i, j; 657 __le32 features; 658 659 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 660 if (!sbi) 661 return -ENOMEM; 662 sb->s_fs_info = sbi; 663 664 /* 665 * See what the current blocksize for the device is, and 666 * use that as the blocksize. Otherwise (or if the blocksize 667 * is smaller than the default) use the default. 668 * This is important for devices that have a hardware 669 * sectorsize that is larger than the default. 670 */ 671 blocksize = sb_min_blocksize(sb, BLOCK_SIZE); 672 if (!blocksize) { 673 printk ("EXT2-fs: unable to set blocksize\n"); 674 goto failed_sbi; 675 } 676 677 /* 678 * If the superblock doesn't start on a hardware sector boundary, 679 * calculate the offset. 680 */ 681 if (blocksize != BLOCK_SIZE) { 682 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 683 offset = (sb_block*BLOCK_SIZE) % blocksize; 684 } else { 685 logic_sb_block = sb_block; 686 } 687 688 if (!(bh = sb_bread(sb, logic_sb_block))) { 689 printk ("EXT2-fs: unable to read superblock\n"); 690 goto failed_sbi; 691 } 692 /* 693 * Note: s_es must be initialized as soon as possible because 694 * some ext2 macro-instructions depend on its value 695 */ 696 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 697 sbi->s_es = es; 698 sb->s_magic = le16_to_cpu(es->s_magic); 699 700 if (sb->s_magic != EXT2_SUPER_MAGIC) 701 goto cantfind_ext2; 702 703 /* Set defaults before we parse the mount options */ 704 def_mount_opts = le32_to_cpu(es->s_default_mount_opts); 705 if (def_mount_opts & EXT2_DEFM_DEBUG) 706 set_opt(sbi->s_mount_opt, DEBUG); 707 if (def_mount_opts & EXT2_DEFM_BSDGROUPS) 708 set_opt(sbi->s_mount_opt, GRPID); 709 if (def_mount_opts & EXT2_DEFM_UID16) 710 set_opt(sbi->s_mount_opt, NO_UID32); 711 #ifdef CONFIG_EXT2_FS_XATTR 712 if (def_mount_opts & EXT2_DEFM_XATTR_USER) 713 set_opt(sbi->s_mount_opt, XATTR_USER); 714 #endif 715 #ifdef CONFIG_EXT2_FS_POSIX_ACL 716 if (def_mount_opts & EXT2_DEFM_ACL) 717 set_opt(sbi->s_mount_opt, POSIX_ACL); 718 #endif 719 720 if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) 721 set_opt(sbi->s_mount_opt, ERRORS_PANIC); 722 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_RO) 723 set_opt(sbi->s_mount_opt, ERRORS_RO); 724 else 725 set_opt(sbi->s_mount_opt, ERRORS_CONT); 726 727 sbi->s_resuid = le16_to_cpu(es->s_def_resuid); 728 sbi->s_resgid = le16_to_cpu(es->s_def_resgid); 729 730 if (!parse_options ((char *) data, sbi)) 731 goto failed_mount; 732 733 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 734 ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? 735 MS_POSIXACL : 0); 736 737 ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset 738 EXT2_MOUNT_XIP if not */ 739 740 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && 741 (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || 742 EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || 743 EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) 744 printk("EXT2-fs warning: feature flags set on rev 0 fs, " 745 "running e2fsck is recommended\n"); 746 /* 747 * Check feature flags regardless of the revision level, since we 748 * previously didn't change the revision level when setting the flags, 749 * so there is a chance incompat flags are set on a rev 0 filesystem. 750 */ 751 features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); 752 if (features) { 753 printk("EXT2-fs: %s: couldn't mount because of " 754 "unsupported optional features (%x).\n", 755 sb->s_id, le32_to_cpu(features)); 756 goto failed_mount; 757 } 758 if (!(sb->s_flags & MS_RDONLY) && 759 (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ 760 printk("EXT2-fs: %s: couldn't mount RDWR because of " 761 "unsupported optional features (%x).\n", 762 sb->s_id, le32_to_cpu(features)); 763 goto failed_mount; 764 } 765 766 blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); 767 768 if ((ext2_use_xip(sb)) && ((blocksize != PAGE_SIZE) || 769 (sb->s_blocksize != blocksize))) { 770 if (!silent) 771 printk("XIP: Unsupported blocksize\n"); 772 goto failed_mount; 773 } 774 775 /* If the blocksize doesn't match, re-read the thing.. */ 776 if (sb->s_blocksize != blocksize) { 777 brelse(bh); 778 779 if (!sb_set_blocksize(sb, blocksize)) { 780 printk(KERN_ERR "EXT2-fs: blocksize too small for device.\n"); 781 goto failed_sbi; 782 } 783 784 logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; 785 offset = (sb_block*BLOCK_SIZE) % blocksize; 786 bh = sb_bread(sb, logic_sb_block); 787 if(!bh) { 788 printk("EXT2-fs: Couldn't read superblock on " 789 "2nd try.\n"); 790 goto failed_sbi; 791 } 792 es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); 793 sbi->s_es = es; 794 if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { 795 printk ("EXT2-fs: Magic mismatch, very weird !\n"); 796 goto failed_mount; 797 } 798 } 799 800 sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); 801 802 if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { 803 sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; 804 sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; 805 } else { 806 sbi->s_inode_size = le16_to_cpu(es->s_inode_size); 807 sbi->s_first_ino = le32_to_cpu(es->s_first_ino); 808 if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || 809 (sbi->s_inode_size & (sbi->s_inode_size - 1)) || 810 (sbi->s_inode_size > blocksize)) { 811 printk ("EXT2-fs: unsupported inode size: %d\n", 812 sbi->s_inode_size); 813 goto failed_mount; 814 } 815 } 816 817 sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << 818 le32_to_cpu(es->s_log_frag_size); 819 if (sbi->s_frag_size == 0) 820 goto cantfind_ext2; 821 sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; 822 823 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); 824 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); 825 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); 826 827 if (EXT2_INODE_SIZE(sb) == 0) 828 goto cantfind_ext2; 829 sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); 830 if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) 831 goto cantfind_ext2; 832 sbi->s_itb_per_group = sbi->s_inodes_per_group / 833 sbi->s_inodes_per_block; 834 sbi->s_desc_per_block = sb->s_blocksize / 835 sizeof (struct ext2_group_desc); 836 sbi->s_sbh = bh; 837 sbi->s_mount_state = le16_to_cpu(es->s_state); 838 sbi->s_addr_per_block_bits = 839 ilog2 (EXT2_ADDR_PER_BLOCK(sb)); 840 sbi->s_desc_per_block_bits = 841 ilog2 (EXT2_DESC_PER_BLOCK(sb)); 842 843 if (sb->s_magic != EXT2_SUPER_MAGIC) 844 goto cantfind_ext2; 845 846 if (sb->s_blocksize != bh->b_size) { 847 if (!silent) 848 printk ("VFS: Unsupported blocksize on dev " 849 "%s.\n", sb->s_id); 850 goto failed_mount; 851 } 852 853 if (sb->s_blocksize != sbi->s_frag_size) { 854 printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n", 855 sbi->s_frag_size, sb->s_blocksize); 856 goto failed_mount; 857 } 858 859 if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { 860 printk ("EXT2-fs: #blocks per group too big: %lu\n", 861 sbi->s_blocks_per_group); 862 goto failed_mount; 863 } 864 if (sbi->s_frags_per_group > sb->s_blocksize * 8) { 865 printk ("EXT2-fs: #fragments per group too big: %lu\n", 866 sbi->s_frags_per_group); 867 goto failed_mount; 868 } 869 if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { 870 printk ("EXT2-fs: #inodes per group too big: %lu\n", 871 sbi->s_inodes_per_group); 872 goto failed_mount; 873 } 874 875 if (EXT2_BLOCKS_PER_GROUP(sb) == 0) 876 goto cantfind_ext2; 877 sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - 878 le32_to_cpu(es->s_first_data_block) - 1) 879 / EXT2_BLOCKS_PER_GROUP(sb)) + 1; 880 db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / 881 EXT2_DESC_PER_BLOCK(sb); 882 sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL); 883 if (sbi->s_group_desc == NULL) { 884 printk ("EXT2-fs: not enough memory\n"); 885 goto failed_mount; 886 } 887 bgl_lock_init(&sbi->s_blockgroup_lock); 888 sbi->s_debts = kmalloc(sbi->s_groups_count * sizeof(*sbi->s_debts), 889 GFP_KERNEL); 890 if (!sbi->s_debts) { 891 printk ("EXT2-fs: not enough memory\n"); 892 goto failed_mount_group_desc; 893 } 894 memset(sbi->s_debts, 0, sbi->s_groups_count * sizeof(*sbi->s_debts)); 895 for (i = 0; i < db_count; i++) { 896 block = descriptor_loc(sb, logic_sb_block, i); 897 sbi->s_group_desc[i] = sb_bread(sb, block); 898 if (!sbi->s_group_desc[i]) { 899 for (j = 0; j < i; j++) 900 brelse (sbi->s_group_desc[j]); 901 printk ("EXT2-fs: unable to read group descriptors\n"); 902 goto failed_mount_group_desc; 903 } 904 } 905 if (!ext2_check_descriptors (sb)) { 906 printk ("EXT2-fs: group descriptors corrupted!\n"); 907 goto failed_mount2; 908 } 909 sbi->s_gdb_count = db_count; 910 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 911 spin_lock_init(&sbi->s_next_gen_lock); 912 913 percpu_counter_init(&sbi->s_freeblocks_counter, 914 ext2_count_free_blocks(sb)); 915 percpu_counter_init(&sbi->s_freeinodes_counter, 916 ext2_count_free_inodes(sb)); 917 percpu_counter_init(&sbi->s_dirs_counter, 918 ext2_count_dirs(sb)); 919 /* 920 * set up enough so that it can read an inode 921 */ 922 sb->s_op = &ext2_sops; 923 sb->s_export_op = &ext2_export_ops; 924 sb->s_xattr = ext2_xattr_handlers; 925 root = iget(sb, EXT2_ROOT_INO); 926 sb->s_root = d_alloc_root(root); 927 if (!sb->s_root) { 928 iput(root); 929 printk(KERN_ERR "EXT2-fs: get root inode failed\n"); 930 goto failed_mount3; 931 } 932 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { 933 dput(sb->s_root); 934 sb->s_root = NULL; 935 printk(KERN_ERR "EXT2-fs: corrupt root inode, run e2fsck\n"); 936 goto failed_mount3; 937 } 938 if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) 939 ext2_warning(sb, __FUNCTION__, 940 "mounting ext3 filesystem as ext2"); 941 ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY); 942 return 0; 943 944 cantfind_ext2: 945 if (!silent) 946 printk("VFS: Can't find an ext2 filesystem on dev %s.\n", 947 sb->s_id); 948 goto failed_mount; 949 failed_mount3: 950 percpu_counter_destroy(&sbi->s_freeblocks_counter); 951 percpu_counter_destroy(&sbi->s_freeinodes_counter); 952 percpu_counter_destroy(&sbi->s_dirs_counter); 953 failed_mount2: 954 for (i = 0; i < db_count; i++) 955 brelse(sbi->s_group_desc[i]); 956 failed_mount_group_desc: 957 kfree(sbi->s_group_desc); 958 kfree(sbi->s_debts); 959 failed_mount: 960 brelse(bh); 961 failed_sbi: 962 sb->s_fs_info = NULL; 963 kfree(sbi); 964 return -EINVAL; 965 } 966 967 static void ext2_commit_super (struct super_block * sb, 968 struct ext2_super_block * es) 969 { 970 es->s_wtime = cpu_to_le32(get_seconds()); 971 mark_buffer_dirty(EXT2_SB(sb)->s_sbh); 972 sb->s_dirt = 0; 973 } 974 975 static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es) 976 { 977 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); 978 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); 979 es->s_wtime = cpu_to_le32(get_seconds()); 980 mark_buffer_dirty(EXT2_SB(sb)->s_sbh); 981 sync_dirty_buffer(EXT2_SB(sb)->s_sbh); 982 sb->s_dirt = 0; 983 } 984 985 /* 986 * In the second extended file system, it is not necessary to 987 * write the super block since we use a mapping of the 988 * disk super block in a buffer. 989 * 990 * However, this function is still used to set the fs valid 991 * flags to 0. We need to set this flag to 0 since the fs 992 * may have been checked while mounted and e2fsck may have 993 * set s_state to EXT2_VALID_FS after some corrections. 994 */ 995 996 void ext2_write_super (struct super_block * sb) 997 { 998 struct ext2_super_block * es; 999 lock_kernel(); 1000 if (!(sb->s_flags & MS_RDONLY)) { 1001 es = EXT2_SB(sb)->s_es; 1002 1003 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS) { 1004 ext2_debug ("setting valid to 0\n"); 1005 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & 1006 ~EXT2_VALID_FS); 1007 es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); 1008 es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); 1009 es->s_mtime = cpu_to_le32(get_seconds()); 1010 ext2_sync_super(sb, es); 1011 } else 1012 ext2_commit_super (sb, es); 1013 } 1014 sb->s_dirt = 0; 1015 unlock_kernel(); 1016 } 1017 1018 static int ext2_remount (struct super_block * sb, int * flags, char * data) 1019 { 1020 struct ext2_sb_info * sbi = EXT2_SB(sb); 1021 struct ext2_super_block * es; 1022 unsigned long old_mount_opt = sbi->s_mount_opt; 1023 struct ext2_mount_options old_opts; 1024 unsigned long old_sb_flags; 1025 int err; 1026 1027 /* Store the old options */ 1028 old_sb_flags = sb->s_flags; 1029 old_opts.s_mount_opt = sbi->s_mount_opt; 1030 old_opts.s_resuid = sbi->s_resuid; 1031 old_opts.s_resgid = sbi->s_resgid; 1032 1033 /* 1034 * Allow the "check" option to be passed as a remount option. 1035 */ 1036 if (!parse_options (data, sbi)) { 1037 err = -EINVAL; 1038 goto restore_opts; 1039 } 1040 1041 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | 1042 ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); 1043 1044 es = sbi->s_es; 1045 if (((sbi->s_mount_opt & EXT2_MOUNT_XIP) != 1046 (old_mount_opt & EXT2_MOUNT_XIP)) && 1047 invalidate_inodes(sb)) 1048 ext2_warning(sb, __FUNCTION__, "busy inodes while remounting "\ 1049 "xip remain in cache (no functional problem)"); 1050 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 1051 return 0; 1052 if (*flags & MS_RDONLY) { 1053 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || 1054 !(sbi->s_mount_state & EXT2_VALID_FS)) 1055 return 0; 1056 /* 1057 * OK, we are remounting a valid rw partition rdonly, so set 1058 * the rdonly flag and then mark the partition as valid again. 1059 */ 1060 es->s_state = cpu_to_le16(sbi->s_mount_state); 1061 es->s_mtime = cpu_to_le32(get_seconds()); 1062 } else { 1063 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, 1064 ~EXT2_FEATURE_RO_COMPAT_SUPP); 1065 if (ret) { 1066 printk("EXT2-fs: %s: couldn't remount RDWR because of " 1067 "unsupported optional features (%x).\n", 1068 sb->s_id, le32_to_cpu(ret)); 1069 err = -EROFS; 1070 goto restore_opts; 1071 } 1072 /* 1073 * Mounting a RDONLY partition read-write, so reread and 1074 * store the current valid flag. (It may have been changed 1075 * by e2fsck since we originally mounted the partition.) 1076 */ 1077 sbi->s_mount_state = le16_to_cpu(es->s_state); 1078 if (!ext2_setup_super (sb, es, 0)) 1079 sb->s_flags &= ~MS_RDONLY; 1080 } 1081 ext2_sync_super(sb, es); 1082 return 0; 1083 restore_opts: 1084 sbi->s_mount_opt = old_opts.s_mount_opt; 1085 sbi->s_resuid = old_opts.s_resuid; 1086 sbi->s_resgid = old_opts.s_resgid; 1087 sb->s_flags = old_sb_flags; 1088 return err; 1089 } 1090 1091 static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) 1092 { 1093 struct super_block *sb = dentry->d_sb; 1094 struct ext2_sb_info *sbi = EXT2_SB(sb); 1095 struct ext2_super_block *es = sbi->s_es; 1096 unsigned long overhead; 1097 int i; 1098 u64 fsid; 1099 1100 if (test_opt (sb, MINIX_DF)) 1101 overhead = 0; 1102 else { 1103 /* 1104 * Compute the overhead (FS structures) 1105 */ 1106 1107 /* 1108 * All of the blocks before first_data_block are 1109 * overhead 1110 */ 1111 overhead = le32_to_cpu(es->s_first_data_block); 1112 1113 /* 1114 * Add the overhead attributed to the superblock and 1115 * block group descriptors. If the sparse superblocks 1116 * feature is turned on, then not all groups have this. 1117 */ 1118 for (i = 0; i < sbi->s_groups_count; i++) 1119 overhead += ext2_bg_has_super(sb, i) + 1120 ext2_bg_num_gdb(sb, i); 1121 1122 /* 1123 * Every block group has an inode bitmap, a block 1124 * bitmap, and an inode table. 1125 */ 1126 overhead += (sbi->s_groups_count * 1127 (2 + sbi->s_itb_per_group)); 1128 } 1129 1130 buf->f_type = EXT2_SUPER_MAGIC; 1131 buf->f_bsize = sb->s_blocksize; 1132 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead; 1133 buf->f_bfree = ext2_count_free_blocks(sb); 1134 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); 1135 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) 1136 buf->f_bavail = 0; 1137 buf->f_files = le32_to_cpu(es->s_inodes_count); 1138 buf->f_ffree = ext2_count_free_inodes(sb); 1139 buf->f_namelen = EXT2_NAME_LEN; 1140 fsid = le64_to_cpup((void *)es->s_uuid) ^ 1141 le64_to_cpup((void *)es->s_uuid + sizeof(u64)); 1142 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; 1143 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; 1144 return 0; 1145 } 1146 1147 static int ext2_get_sb(struct file_system_type *fs_type, 1148 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 1149 { 1150 return get_sb_bdev(fs_type, flags, dev_name, data, ext2_fill_super, mnt); 1151 } 1152 1153 #ifdef CONFIG_QUOTA 1154 1155 /* Read data from quotafile - avoid pagecache and such because we cannot afford 1156 * acquiring the locks... As quota files are never truncated and quota code 1157 * itself serializes the operations (and noone else should touch the files) 1158 * we don't have to be afraid of races */ 1159 static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, 1160 size_t len, loff_t off) 1161 { 1162 struct inode *inode = sb_dqopt(sb)->files[type]; 1163 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1164 int err = 0; 1165 int offset = off & (sb->s_blocksize - 1); 1166 int tocopy; 1167 size_t toread; 1168 struct buffer_head tmp_bh; 1169 struct buffer_head *bh; 1170 loff_t i_size = i_size_read(inode); 1171 1172 if (off > i_size) 1173 return 0; 1174 if (off+len > i_size) 1175 len = i_size-off; 1176 toread = len; 1177 while (toread > 0) { 1178 tocopy = sb->s_blocksize - offset < toread ? 1179 sb->s_blocksize - offset : toread; 1180 1181 tmp_bh.b_state = 0; 1182 err = ext2_get_block(inode, blk, &tmp_bh, 0); 1183 if (err) 1184 return err; 1185 if (!buffer_mapped(&tmp_bh)) /* A hole? */ 1186 memset(data, 0, tocopy); 1187 else { 1188 bh = sb_bread(sb, tmp_bh.b_blocknr); 1189 if (!bh) 1190 return -EIO; 1191 memcpy(data, bh->b_data+offset, tocopy); 1192 brelse(bh); 1193 } 1194 offset = 0; 1195 toread -= tocopy; 1196 data += tocopy; 1197 blk++; 1198 } 1199 return len; 1200 } 1201 1202 /* Write to quotafile */ 1203 static ssize_t ext2_quota_write(struct super_block *sb, int type, 1204 const char *data, size_t len, loff_t off) 1205 { 1206 struct inode *inode = sb_dqopt(sb)->files[type]; 1207 sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); 1208 int err = 0; 1209 int offset = off & (sb->s_blocksize - 1); 1210 int tocopy; 1211 size_t towrite = len; 1212 struct buffer_head tmp_bh; 1213 struct buffer_head *bh; 1214 1215 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); 1216 while (towrite > 0) { 1217 tocopy = sb->s_blocksize - offset < towrite ? 1218 sb->s_blocksize - offset : towrite; 1219 1220 tmp_bh.b_state = 0; 1221 err = ext2_get_block(inode, blk, &tmp_bh, 1); 1222 if (err) 1223 goto out; 1224 if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) 1225 bh = sb_bread(sb, tmp_bh.b_blocknr); 1226 else 1227 bh = sb_getblk(sb, tmp_bh.b_blocknr); 1228 if (!bh) { 1229 err = -EIO; 1230 goto out; 1231 } 1232 lock_buffer(bh); 1233 memcpy(bh->b_data+offset, data, tocopy); 1234 flush_dcache_page(bh->b_page); 1235 set_buffer_uptodate(bh); 1236 mark_buffer_dirty(bh); 1237 unlock_buffer(bh); 1238 brelse(bh); 1239 offset = 0; 1240 towrite -= tocopy; 1241 data += tocopy; 1242 blk++; 1243 } 1244 out: 1245 if (len == towrite) 1246 return err; 1247 if (inode->i_size < off+len-towrite) 1248 i_size_write(inode, off+len-towrite); 1249 inode->i_version++; 1250 inode->i_mtime = inode->i_ctime = CURRENT_TIME; 1251 mark_inode_dirty(inode); 1252 mutex_unlock(&inode->i_mutex); 1253 return len - towrite; 1254 } 1255 1256 #endif 1257 1258 static struct file_system_type ext2_fs_type = { 1259 .owner = THIS_MODULE, 1260 .name = "ext2", 1261 .get_sb = ext2_get_sb, 1262 .kill_sb = kill_block_super, 1263 .fs_flags = FS_REQUIRES_DEV, 1264 }; 1265 1266 static int __init init_ext2_fs(void) 1267 { 1268 int err = init_ext2_xattr(); 1269 if (err) 1270 return err; 1271 err = init_inodecache(); 1272 if (err) 1273 goto out1; 1274 err = register_filesystem(&ext2_fs_type); 1275 if (err) 1276 goto out; 1277 return 0; 1278 out: 1279 destroy_inodecache(); 1280 out1: 1281 exit_ext2_xattr(); 1282 return err; 1283 } 1284 1285 static void __exit exit_ext2_fs(void) 1286 { 1287 unregister_filesystem(&ext2_fs_type); 1288 destroy_inodecache(); 1289 exit_ext2_xattr(); 1290 } 1291 1292 module_init(init_ext2_fs) 1293 module_exit(exit_ext2_fs) 1294