Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/ext2/super.c |
| 3 | * |
| 4 | * Copyright (C) 1992, 1993, 1994, 1995 |
| 5 | * Remy Card (card@masi.ibp.fr) |
| 6 | * Laboratoire MASI - Institut Blaise Pascal |
| 7 | * Universite Pierre et Marie Curie (Paris VI) |
| 8 | * |
| 9 | * from |
| 10 | * |
| 11 | * linux/fs/minix/inode.c |
| 12 | * |
| 13 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 14 | * |
| 15 | * Big-endian to little-endian byte-swapping/bitmaps by |
| 16 | * David S. Miller (davem@caip.rutgers.edu), 1995 |
| 17 | */ |
| 18 | |
| 19 | #include <linux/config.h> |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/string.h> |
| 22 | #include <linux/slab.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/blkdev.h> |
| 25 | #include <linux/parser.h> |
| 26 | #include <linux/random.h> |
| 27 | #include <linux/buffer_head.h> |
| 28 | #include <linux/smp_lock.h> |
| 29 | #include <linux/vfs.h> |
| 30 | #include <asm/uaccess.h> |
| 31 | #include "ext2.h" |
| 32 | #include "xattr.h" |
| 33 | #include "acl.h" |
| 34 | |
| 35 | static void ext2_sync_super(struct super_block *sb, |
| 36 | struct ext2_super_block *es); |
| 37 | static int ext2_remount (struct super_block * sb, int * flags, char * data); |
| 38 | static int ext2_statfs (struct super_block * sb, struct kstatfs * buf); |
| 39 | |
| 40 | void ext2_error (struct super_block * sb, const char * function, |
| 41 | const char * fmt, ...) |
| 42 | { |
| 43 | va_list args; |
| 44 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 45 | struct ext2_super_block *es = sbi->s_es; |
| 46 | |
| 47 | if (!(sb->s_flags & MS_RDONLY)) { |
| 48 | sbi->s_mount_state |= EXT2_ERROR_FS; |
| 49 | es->s_state = |
| 50 | cpu_to_le16(le16_to_cpu(es->s_state) | EXT2_ERROR_FS); |
| 51 | ext2_sync_super(sb, es); |
| 52 | } |
| 53 | |
| 54 | va_start(args, fmt); |
| 55 | printk(KERN_CRIT "EXT2-fs error (device %s): %s: ",sb->s_id, function); |
| 56 | vprintk(fmt, args); |
| 57 | printk("\n"); |
| 58 | va_end(args); |
| 59 | |
| 60 | if (test_opt(sb, ERRORS_PANIC)) |
| 61 | panic("EXT2-fs panic from previous error\n"); |
| 62 | if (test_opt(sb, ERRORS_RO)) { |
| 63 | printk("Remounting filesystem read-only\n"); |
| 64 | sb->s_flags |= MS_RDONLY; |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | void ext2_warning (struct super_block * sb, const char * function, |
| 69 | const char * fmt, ...) |
| 70 | { |
| 71 | va_list args; |
| 72 | |
| 73 | va_start(args, fmt); |
| 74 | printk(KERN_WARNING "EXT2-fs warning (device %s): %s: ", |
| 75 | sb->s_id, function); |
| 76 | vprintk(fmt, args); |
| 77 | printk("\n"); |
| 78 | va_end(args); |
| 79 | } |
| 80 | |
| 81 | void ext2_update_dynamic_rev(struct super_block *sb) |
| 82 | { |
| 83 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; |
| 84 | |
| 85 | if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV) |
| 86 | return; |
| 87 | |
| 88 | ext2_warning(sb, __FUNCTION__, |
| 89 | "updating to rev %d because of new feature flag, " |
| 90 | "running e2fsck is recommended", |
| 91 | EXT2_DYNAMIC_REV); |
| 92 | |
| 93 | es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO); |
| 94 | es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE); |
| 95 | es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV); |
| 96 | /* leave es->s_feature_*compat flags alone */ |
| 97 | /* es->s_uuid will be set by e2fsck if empty */ |
| 98 | |
| 99 | /* |
| 100 | * The rest of the superblock fields should be zero, and if not it |
| 101 | * means they are likely already in use, so leave them alone. We |
| 102 | * can leave it up to e2fsck to clean up any inconsistencies there. |
| 103 | */ |
| 104 | } |
| 105 | |
| 106 | static void ext2_put_super (struct super_block * sb) |
| 107 | { |
| 108 | int db_count; |
| 109 | int i; |
| 110 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 111 | |
| 112 | ext2_xattr_put_super(sb); |
| 113 | if (!(sb->s_flags & MS_RDONLY)) { |
| 114 | struct ext2_super_block *es = sbi->s_es; |
| 115 | |
| 116 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
| 117 | ext2_sync_super(sb, es); |
| 118 | } |
| 119 | db_count = sbi->s_gdb_count; |
| 120 | for (i = 0; i < db_count; i++) |
| 121 | if (sbi->s_group_desc[i]) |
| 122 | brelse (sbi->s_group_desc[i]); |
| 123 | kfree(sbi->s_group_desc); |
| 124 | kfree(sbi->s_debts); |
| 125 | percpu_counter_destroy(&sbi->s_freeblocks_counter); |
| 126 | percpu_counter_destroy(&sbi->s_freeinodes_counter); |
| 127 | percpu_counter_destroy(&sbi->s_dirs_counter); |
| 128 | brelse (sbi->s_sbh); |
| 129 | sb->s_fs_info = NULL; |
| 130 | kfree(sbi); |
| 131 | |
| 132 | return; |
| 133 | } |
| 134 | |
| 135 | static kmem_cache_t * ext2_inode_cachep; |
| 136 | |
| 137 | static struct inode *ext2_alloc_inode(struct super_block *sb) |
| 138 | { |
| 139 | struct ext2_inode_info *ei; |
| 140 | ei = (struct ext2_inode_info *)kmem_cache_alloc(ext2_inode_cachep, SLAB_KERNEL); |
| 141 | if (!ei) |
| 142 | return NULL; |
| 143 | #ifdef CONFIG_EXT2_FS_POSIX_ACL |
| 144 | ei->i_acl = EXT2_ACL_NOT_CACHED; |
| 145 | ei->i_default_acl = EXT2_ACL_NOT_CACHED; |
| 146 | #endif |
| 147 | ei->vfs_inode.i_version = 1; |
| 148 | return &ei->vfs_inode; |
| 149 | } |
| 150 | |
| 151 | static void ext2_destroy_inode(struct inode *inode) |
| 152 | { |
| 153 | kmem_cache_free(ext2_inode_cachep, EXT2_I(inode)); |
| 154 | } |
| 155 | |
| 156 | static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) |
| 157 | { |
| 158 | struct ext2_inode_info *ei = (struct ext2_inode_info *) foo; |
| 159 | |
| 160 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == |
| 161 | SLAB_CTOR_CONSTRUCTOR) { |
| 162 | rwlock_init(&ei->i_meta_lock); |
| 163 | #ifdef CONFIG_EXT2_FS_XATTR |
| 164 | init_rwsem(&ei->xattr_sem); |
| 165 | #endif |
| 166 | inode_init_once(&ei->vfs_inode); |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | static int init_inodecache(void) |
| 171 | { |
| 172 | ext2_inode_cachep = kmem_cache_create("ext2_inode_cache", |
| 173 | sizeof(struct ext2_inode_info), |
| 174 | 0, SLAB_RECLAIM_ACCOUNT, |
| 175 | init_once, NULL); |
| 176 | if (ext2_inode_cachep == NULL) |
| 177 | return -ENOMEM; |
| 178 | return 0; |
| 179 | } |
| 180 | |
| 181 | static void destroy_inodecache(void) |
| 182 | { |
| 183 | if (kmem_cache_destroy(ext2_inode_cachep)) |
| 184 | printk(KERN_INFO "ext2_inode_cache: not all structures were freed\n"); |
| 185 | } |
| 186 | |
| 187 | static void ext2_clear_inode(struct inode *inode) |
| 188 | { |
| 189 | #ifdef CONFIG_EXT2_FS_POSIX_ACL |
| 190 | struct ext2_inode_info *ei = EXT2_I(inode); |
| 191 | |
| 192 | if (ei->i_acl && ei->i_acl != EXT2_ACL_NOT_CACHED) { |
| 193 | posix_acl_release(ei->i_acl); |
| 194 | ei->i_acl = EXT2_ACL_NOT_CACHED; |
| 195 | } |
| 196 | if (ei->i_default_acl && ei->i_default_acl != EXT2_ACL_NOT_CACHED) { |
| 197 | posix_acl_release(ei->i_default_acl); |
| 198 | ei->i_default_acl = EXT2_ACL_NOT_CACHED; |
| 199 | } |
| 200 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | } |
| 202 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | #ifdef CONFIG_QUOTA |
| 204 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); |
| 205 | static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); |
| 206 | #endif |
| 207 | |
| 208 | static struct super_operations ext2_sops = { |
| 209 | .alloc_inode = ext2_alloc_inode, |
| 210 | .destroy_inode = ext2_destroy_inode, |
| 211 | .read_inode = ext2_read_inode, |
| 212 | .write_inode = ext2_write_inode, |
Bernard Blackham | e072c6f | 2005-04-16 15:25:45 -0700 | [diff] [blame^] | 213 | .put_inode = ext2_put_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | .delete_inode = ext2_delete_inode, |
| 215 | .put_super = ext2_put_super, |
| 216 | .write_super = ext2_write_super, |
| 217 | .statfs = ext2_statfs, |
| 218 | .remount_fs = ext2_remount, |
| 219 | .clear_inode = ext2_clear_inode, |
| 220 | #ifdef CONFIG_QUOTA |
| 221 | .quota_read = ext2_quota_read, |
| 222 | .quota_write = ext2_quota_write, |
| 223 | #endif |
| 224 | }; |
| 225 | |
| 226 | /* Yes, most of these are left as NULL!! |
| 227 | * A NULL value implies the default, which works with ext2-like file |
| 228 | * systems, but can be improved upon. |
| 229 | * Currently only get_parent is required. |
| 230 | */ |
| 231 | struct dentry *ext2_get_parent(struct dentry *child); |
| 232 | static struct export_operations ext2_export_ops = { |
| 233 | .get_parent = ext2_get_parent, |
| 234 | }; |
| 235 | |
| 236 | static unsigned long get_sb_block(void **data) |
| 237 | { |
| 238 | unsigned long sb_block; |
| 239 | char *options = (char *) *data; |
| 240 | |
| 241 | if (!options || strncmp(options, "sb=", 3) != 0) |
| 242 | return 1; /* Default location */ |
| 243 | options += 3; |
| 244 | sb_block = simple_strtoul(options, &options, 0); |
| 245 | if (*options && *options != ',') { |
| 246 | printk("EXT2-fs: Invalid sb specification: %s\n", |
| 247 | (char *) *data); |
| 248 | return 1; |
| 249 | } |
| 250 | if (*options == ',') |
| 251 | options++; |
| 252 | *data = (void *) options; |
| 253 | return sb_block; |
| 254 | } |
| 255 | |
| 256 | enum { |
| 257 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, |
| 258 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, |
| 259 | Opt_nouid32, Opt_check, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov, Opt_nobh, |
| 260 | Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, |
| 261 | Opt_ignore, Opt_err, |
| 262 | }; |
| 263 | |
| 264 | static match_table_t tokens = { |
| 265 | {Opt_bsd_df, "bsddf"}, |
| 266 | {Opt_minix_df, "minixdf"}, |
| 267 | {Opt_grpid, "grpid"}, |
| 268 | {Opt_grpid, "bsdgroups"}, |
| 269 | {Opt_nogrpid, "nogrpid"}, |
| 270 | {Opt_nogrpid, "sysvgroups"}, |
| 271 | {Opt_resgid, "resgid=%u"}, |
| 272 | {Opt_resuid, "resuid=%u"}, |
| 273 | {Opt_sb, "sb=%u"}, |
| 274 | {Opt_err_cont, "errors=continue"}, |
| 275 | {Opt_err_panic, "errors=panic"}, |
| 276 | {Opt_err_ro, "errors=remount-ro"}, |
| 277 | {Opt_nouid32, "nouid32"}, |
| 278 | {Opt_nocheck, "check=none"}, |
| 279 | {Opt_nocheck, "nocheck"}, |
| 280 | {Opt_check, "check"}, |
| 281 | {Opt_debug, "debug"}, |
| 282 | {Opt_oldalloc, "oldalloc"}, |
| 283 | {Opt_orlov, "orlov"}, |
| 284 | {Opt_nobh, "nobh"}, |
| 285 | {Opt_user_xattr, "user_xattr"}, |
| 286 | {Opt_nouser_xattr, "nouser_xattr"}, |
| 287 | {Opt_acl, "acl"}, |
| 288 | {Opt_noacl, "noacl"}, |
| 289 | {Opt_ignore, "grpquota"}, |
| 290 | {Opt_ignore, "noquota"}, |
| 291 | {Opt_ignore, "quota"}, |
| 292 | {Opt_ignore, "usrquota"}, |
| 293 | {Opt_err, NULL} |
| 294 | }; |
| 295 | |
| 296 | static int parse_options (char * options, |
| 297 | struct ext2_sb_info *sbi) |
| 298 | { |
| 299 | char * p; |
| 300 | substring_t args[MAX_OPT_ARGS]; |
| 301 | unsigned long kind = EXT2_MOUNT_ERRORS_CONT; |
| 302 | int option; |
| 303 | |
| 304 | if (!options) |
| 305 | return 1; |
| 306 | |
| 307 | while ((p = strsep (&options, ",")) != NULL) { |
| 308 | int token; |
| 309 | if (!*p) |
| 310 | continue; |
| 311 | |
| 312 | token = match_token(p, tokens, args); |
| 313 | switch (token) { |
| 314 | case Opt_bsd_df: |
| 315 | clear_opt (sbi->s_mount_opt, MINIX_DF); |
| 316 | break; |
| 317 | case Opt_minix_df: |
| 318 | set_opt (sbi->s_mount_opt, MINIX_DF); |
| 319 | break; |
| 320 | case Opt_grpid: |
| 321 | set_opt (sbi->s_mount_opt, GRPID); |
| 322 | break; |
| 323 | case Opt_nogrpid: |
| 324 | clear_opt (sbi->s_mount_opt, GRPID); |
| 325 | break; |
| 326 | case Opt_resuid: |
| 327 | if (match_int(&args[0], &option)) |
| 328 | return 0; |
| 329 | sbi->s_resuid = option; |
| 330 | break; |
| 331 | case Opt_resgid: |
| 332 | if (match_int(&args[0], &option)) |
| 333 | return 0; |
| 334 | sbi->s_resgid = option; |
| 335 | break; |
| 336 | case Opt_sb: |
| 337 | /* handled by get_sb_block() instead of here */ |
| 338 | /* *sb_block = match_int(&args[0]); */ |
| 339 | break; |
| 340 | case Opt_err_panic: |
| 341 | kind = EXT2_MOUNT_ERRORS_PANIC; |
| 342 | break; |
| 343 | case Opt_err_ro: |
| 344 | kind = EXT2_MOUNT_ERRORS_RO; |
| 345 | break; |
| 346 | case Opt_err_cont: |
| 347 | kind = EXT2_MOUNT_ERRORS_CONT; |
| 348 | break; |
| 349 | case Opt_nouid32: |
| 350 | set_opt (sbi->s_mount_opt, NO_UID32); |
| 351 | break; |
| 352 | case Opt_check: |
| 353 | #ifdef CONFIG_EXT2_CHECK |
| 354 | set_opt (sbi->s_mount_opt, CHECK); |
| 355 | #else |
| 356 | printk("EXT2 Check option not supported\n"); |
| 357 | #endif |
| 358 | break; |
| 359 | case Opt_nocheck: |
| 360 | clear_opt (sbi->s_mount_opt, CHECK); |
| 361 | break; |
| 362 | case Opt_debug: |
| 363 | set_opt (sbi->s_mount_opt, DEBUG); |
| 364 | break; |
| 365 | case Opt_oldalloc: |
| 366 | set_opt (sbi->s_mount_opt, OLDALLOC); |
| 367 | break; |
| 368 | case Opt_orlov: |
| 369 | clear_opt (sbi->s_mount_opt, OLDALLOC); |
| 370 | break; |
| 371 | case Opt_nobh: |
| 372 | set_opt (sbi->s_mount_opt, NOBH); |
| 373 | break; |
| 374 | #ifdef CONFIG_EXT2_FS_XATTR |
| 375 | case Opt_user_xattr: |
| 376 | set_opt (sbi->s_mount_opt, XATTR_USER); |
| 377 | break; |
| 378 | case Opt_nouser_xattr: |
| 379 | clear_opt (sbi->s_mount_opt, XATTR_USER); |
| 380 | break; |
| 381 | #else |
| 382 | case Opt_user_xattr: |
| 383 | case Opt_nouser_xattr: |
| 384 | printk("EXT2 (no)user_xattr options not supported\n"); |
| 385 | break; |
| 386 | #endif |
| 387 | #ifdef CONFIG_EXT2_FS_POSIX_ACL |
| 388 | case Opt_acl: |
| 389 | set_opt(sbi->s_mount_opt, POSIX_ACL); |
| 390 | break; |
| 391 | case Opt_noacl: |
| 392 | clear_opt(sbi->s_mount_opt, POSIX_ACL); |
| 393 | break; |
| 394 | #else |
| 395 | case Opt_acl: |
| 396 | case Opt_noacl: |
| 397 | printk("EXT2 (no)acl options not supported\n"); |
| 398 | break; |
| 399 | #endif |
| 400 | case Opt_ignore: |
| 401 | break; |
| 402 | default: |
| 403 | return 0; |
| 404 | } |
| 405 | } |
| 406 | sbi->s_mount_opt |= kind; |
| 407 | return 1; |
| 408 | } |
| 409 | |
| 410 | static int ext2_setup_super (struct super_block * sb, |
| 411 | struct ext2_super_block * es, |
| 412 | int read_only) |
| 413 | { |
| 414 | int res = 0; |
| 415 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 416 | |
| 417 | if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { |
| 418 | printk ("EXT2-fs warning: revision level too high, " |
| 419 | "forcing read-only mode\n"); |
| 420 | res = MS_RDONLY; |
| 421 | } |
| 422 | if (read_only) |
| 423 | return res; |
| 424 | if (!(sbi->s_mount_state & EXT2_VALID_FS)) |
| 425 | printk ("EXT2-fs warning: mounting unchecked fs, " |
| 426 | "running e2fsck is recommended\n"); |
| 427 | else if ((sbi->s_mount_state & EXT2_ERROR_FS)) |
| 428 | printk ("EXT2-fs warning: mounting fs with errors, " |
| 429 | "running e2fsck is recommended\n"); |
| 430 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && |
| 431 | le16_to_cpu(es->s_mnt_count) >= |
| 432 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) |
| 433 | printk ("EXT2-fs warning: maximal mount count reached, " |
| 434 | "running e2fsck is recommended\n"); |
| 435 | else if (le32_to_cpu(es->s_checkinterval) && |
| 436 | (le32_to_cpu(es->s_lastcheck) + le32_to_cpu(es->s_checkinterval) <= get_seconds())) |
| 437 | printk ("EXT2-fs warning: checktime reached, " |
| 438 | "running e2fsck is recommended\n"); |
| 439 | if (!le16_to_cpu(es->s_max_mnt_count)) |
| 440 | es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); |
| 441 | es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1); |
| 442 | ext2_write_super(sb); |
| 443 | if (test_opt (sb, DEBUG)) |
| 444 | printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, " |
| 445 | "bpg=%lu, ipg=%lu, mo=%04lx]\n", |
| 446 | EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, |
| 447 | sbi->s_frag_size, |
| 448 | sbi->s_groups_count, |
| 449 | EXT2_BLOCKS_PER_GROUP(sb), |
| 450 | EXT2_INODES_PER_GROUP(sb), |
| 451 | sbi->s_mount_opt); |
| 452 | #ifdef CONFIG_EXT2_CHECK |
| 453 | if (test_opt (sb, CHECK)) { |
| 454 | ext2_check_blocks_bitmap (sb); |
| 455 | ext2_check_inodes_bitmap (sb); |
| 456 | } |
| 457 | #endif |
| 458 | return res; |
| 459 | } |
| 460 | |
| 461 | static int ext2_check_descriptors (struct super_block * sb) |
| 462 | { |
| 463 | int i; |
| 464 | int desc_block = 0; |
| 465 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 466 | unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block); |
| 467 | struct ext2_group_desc * gdp = NULL; |
| 468 | |
| 469 | ext2_debug ("Checking group descriptors"); |
| 470 | |
| 471 | for (i = 0; i < sbi->s_groups_count; i++) |
| 472 | { |
| 473 | if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0) |
| 474 | gdp = (struct ext2_group_desc *) sbi->s_group_desc[desc_block++]->b_data; |
| 475 | if (le32_to_cpu(gdp->bg_block_bitmap) < block || |
| 476 | le32_to_cpu(gdp->bg_block_bitmap) >= block + EXT2_BLOCKS_PER_GROUP(sb)) |
| 477 | { |
| 478 | ext2_error (sb, "ext2_check_descriptors", |
| 479 | "Block bitmap for group %d" |
| 480 | " not in group (block %lu)!", |
| 481 | i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); |
| 482 | return 0; |
| 483 | } |
| 484 | if (le32_to_cpu(gdp->bg_inode_bitmap) < block || |
| 485 | le32_to_cpu(gdp->bg_inode_bitmap) >= block + EXT2_BLOCKS_PER_GROUP(sb)) |
| 486 | { |
| 487 | ext2_error (sb, "ext2_check_descriptors", |
| 488 | "Inode bitmap for group %d" |
| 489 | " not in group (block %lu)!", |
| 490 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); |
| 491 | return 0; |
| 492 | } |
| 493 | if (le32_to_cpu(gdp->bg_inode_table) < block || |
| 494 | le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >= |
| 495 | block + EXT2_BLOCKS_PER_GROUP(sb)) |
| 496 | { |
| 497 | ext2_error (sb, "ext2_check_descriptors", |
| 498 | "Inode table for group %d" |
| 499 | " not in group (block %lu)!", |
| 500 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); |
| 501 | return 0; |
| 502 | } |
| 503 | block += EXT2_BLOCKS_PER_GROUP(sb); |
| 504 | gdp++; |
| 505 | } |
| 506 | return 1; |
| 507 | } |
| 508 | |
| 509 | #define log2(n) ffz(~(n)) |
| 510 | |
| 511 | /* |
| 512 | * Maximal file size. There is a direct, and {,double-,triple-}indirect |
| 513 | * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. |
| 514 | * We need to be 1 filesystem block less than the 2^32 sector limit. |
| 515 | */ |
| 516 | static loff_t ext2_max_size(int bits) |
| 517 | { |
| 518 | loff_t res = EXT2_NDIR_BLOCKS; |
| 519 | /* This constant is calculated to be the largest file size for a |
| 520 | * dense, 4k-blocksize file such that the total number of |
| 521 | * sectors in the file, including data and all indirect blocks, |
| 522 | * does not exceed 2^32. */ |
| 523 | const loff_t upper_limit = 0x1ff7fffd000LL; |
| 524 | |
| 525 | res += 1LL << (bits-2); |
| 526 | res += 1LL << (2*(bits-2)); |
| 527 | res += 1LL << (3*(bits-2)); |
| 528 | res <<= bits; |
| 529 | if (res > upper_limit) |
| 530 | res = upper_limit; |
| 531 | return res; |
| 532 | } |
| 533 | |
| 534 | static unsigned long descriptor_loc(struct super_block *sb, |
| 535 | unsigned long logic_sb_block, |
| 536 | int nr) |
| 537 | { |
| 538 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 539 | unsigned long bg, first_data_block, first_meta_bg; |
| 540 | int has_super = 0; |
| 541 | |
| 542 | first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block); |
| 543 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); |
| 544 | |
| 545 | if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || |
| 546 | nr < first_meta_bg) |
| 547 | return (logic_sb_block + nr + 1); |
| 548 | bg = sbi->s_desc_per_block * nr; |
| 549 | if (ext2_bg_has_super(sb, bg)) |
| 550 | has_super = 1; |
| 551 | return (first_data_block + has_super + (bg * sbi->s_blocks_per_group)); |
| 552 | } |
| 553 | |
| 554 | static int ext2_fill_super(struct super_block *sb, void *data, int silent) |
| 555 | { |
| 556 | struct buffer_head * bh; |
| 557 | struct ext2_sb_info * sbi; |
| 558 | struct ext2_super_block * es; |
| 559 | struct inode *root; |
| 560 | unsigned long block; |
| 561 | unsigned long sb_block = get_sb_block(&data); |
| 562 | unsigned long logic_sb_block; |
| 563 | unsigned long offset = 0; |
| 564 | unsigned long def_mount_opts; |
| 565 | int blocksize = BLOCK_SIZE; |
| 566 | int db_count; |
| 567 | int i, j; |
| 568 | __le32 features; |
| 569 | |
| 570 | sbi = kmalloc(sizeof(*sbi), GFP_KERNEL); |
| 571 | if (!sbi) |
| 572 | return -ENOMEM; |
| 573 | sb->s_fs_info = sbi; |
| 574 | memset(sbi, 0, sizeof(*sbi)); |
| 575 | |
| 576 | /* |
| 577 | * See what the current blocksize for the device is, and |
| 578 | * use that as the blocksize. Otherwise (or if the blocksize |
| 579 | * is smaller than the default) use the default. |
| 580 | * This is important for devices that have a hardware |
| 581 | * sectorsize that is larger than the default. |
| 582 | */ |
| 583 | blocksize = sb_min_blocksize(sb, BLOCK_SIZE); |
| 584 | if (!blocksize) { |
| 585 | printk ("EXT2-fs: unable to set blocksize\n"); |
| 586 | goto failed_sbi; |
| 587 | } |
| 588 | |
| 589 | /* |
| 590 | * If the superblock doesn't start on a hardware sector boundary, |
| 591 | * calculate the offset. |
| 592 | */ |
| 593 | if (blocksize != BLOCK_SIZE) { |
| 594 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; |
| 595 | offset = (sb_block*BLOCK_SIZE) % blocksize; |
| 596 | } else { |
| 597 | logic_sb_block = sb_block; |
| 598 | } |
| 599 | |
| 600 | if (!(bh = sb_bread(sb, logic_sb_block))) { |
| 601 | printk ("EXT2-fs: unable to read superblock\n"); |
| 602 | goto failed_sbi; |
| 603 | } |
| 604 | /* |
| 605 | * Note: s_es must be initialized as soon as possible because |
| 606 | * some ext2 macro-instructions depend on its value |
| 607 | */ |
| 608 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); |
| 609 | sbi->s_es = es; |
| 610 | sb->s_magic = le16_to_cpu(es->s_magic); |
| 611 | |
| 612 | if (sb->s_magic != EXT2_SUPER_MAGIC) |
| 613 | goto cantfind_ext2; |
| 614 | |
| 615 | /* Set defaults before we parse the mount options */ |
| 616 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); |
| 617 | if (def_mount_opts & EXT2_DEFM_DEBUG) |
| 618 | set_opt(sbi->s_mount_opt, DEBUG); |
| 619 | if (def_mount_opts & EXT2_DEFM_BSDGROUPS) |
| 620 | set_opt(sbi->s_mount_opt, GRPID); |
| 621 | if (def_mount_opts & EXT2_DEFM_UID16) |
| 622 | set_opt(sbi->s_mount_opt, NO_UID32); |
| 623 | if (def_mount_opts & EXT2_DEFM_XATTR_USER) |
| 624 | set_opt(sbi->s_mount_opt, XATTR_USER); |
| 625 | if (def_mount_opts & EXT2_DEFM_ACL) |
| 626 | set_opt(sbi->s_mount_opt, POSIX_ACL); |
| 627 | |
| 628 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) |
| 629 | set_opt(sbi->s_mount_opt, ERRORS_PANIC); |
| 630 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_RO) |
| 631 | set_opt(sbi->s_mount_opt, ERRORS_RO); |
| 632 | |
| 633 | sbi->s_resuid = le16_to_cpu(es->s_def_resuid); |
| 634 | sbi->s_resgid = le16_to_cpu(es->s_def_resgid); |
| 635 | |
| 636 | if (!parse_options ((char *) data, sbi)) |
| 637 | goto failed_mount; |
| 638 | |
| 639 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | |
| 640 | ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? |
| 641 | MS_POSIXACL : 0); |
| 642 | |
| 643 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && |
| 644 | (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || |
| 645 | EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || |
| 646 | EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) |
| 647 | printk("EXT2-fs warning: feature flags set on rev 0 fs, " |
| 648 | "running e2fsck is recommended\n"); |
| 649 | /* |
| 650 | * Check feature flags regardless of the revision level, since we |
| 651 | * previously didn't change the revision level when setting the flags, |
| 652 | * so there is a chance incompat flags are set on a rev 0 filesystem. |
| 653 | */ |
| 654 | features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); |
| 655 | if (features) { |
| 656 | printk("EXT2-fs: %s: couldn't mount because of " |
| 657 | "unsupported optional features (%x).\n", |
| 658 | sb->s_id, le32_to_cpu(features)); |
| 659 | goto failed_mount; |
| 660 | } |
| 661 | if (!(sb->s_flags & MS_RDONLY) && |
| 662 | (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ |
| 663 | printk("EXT2-fs: %s: couldn't mount RDWR because of " |
| 664 | "unsupported optional features (%x).\n", |
| 665 | sb->s_id, le32_to_cpu(features)); |
| 666 | goto failed_mount; |
| 667 | } |
| 668 | |
| 669 | blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); |
| 670 | |
| 671 | /* If the blocksize doesn't match, re-read the thing.. */ |
| 672 | if (sb->s_blocksize != blocksize) { |
| 673 | brelse(bh); |
| 674 | |
| 675 | if (!sb_set_blocksize(sb, blocksize)) { |
| 676 | printk(KERN_ERR "EXT2-fs: blocksize too small for device.\n"); |
| 677 | goto failed_sbi; |
| 678 | } |
| 679 | |
| 680 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; |
| 681 | offset = (sb_block*BLOCK_SIZE) % blocksize; |
| 682 | bh = sb_bread(sb, logic_sb_block); |
| 683 | if(!bh) { |
| 684 | printk("EXT2-fs: Couldn't read superblock on " |
| 685 | "2nd try.\n"); |
| 686 | goto failed_sbi; |
| 687 | } |
| 688 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); |
| 689 | sbi->s_es = es; |
| 690 | if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { |
| 691 | printk ("EXT2-fs: Magic mismatch, very weird !\n"); |
| 692 | goto failed_mount; |
| 693 | } |
| 694 | } |
| 695 | |
| 696 | sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); |
| 697 | |
| 698 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { |
| 699 | sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; |
| 700 | sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; |
| 701 | } else { |
| 702 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); |
| 703 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); |
| 704 | if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || |
| 705 | (sbi->s_inode_size & (sbi->s_inode_size - 1)) || |
| 706 | (sbi->s_inode_size > blocksize)) { |
| 707 | printk ("EXT2-fs: unsupported inode size: %d\n", |
| 708 | sbi->s_inode_size); |
| 709 | goto failed_mount; |
| 710 | } |
| 711 | } |
| 712 | |
| 713 | sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << |
| 714 | le32_to_cpu(es->s_log_frag_size); |
| 715 | if (sbi->s_frag_size == 0) |
| 716 | goto cantfind_ext2; |
| 717 | sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; |
| 718 | |
| 719 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); |
| 720 | sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); |
| 721 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); |
| 722 | |
| 723 | if (EXT2_INODE_SIZE(sb) == 0) |
| 724 | goto cantfind_ext2; |
| 725 | sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); |
| 726 | if (sbi->s_inodes_per_block == 0) |
| 727 | goto cantfind_ext2; |
| 728 | sbi->s_itb_per_group = sbi->s_inodes_per_group / |
| 729 | sbi->s_inodes_per_block; |
| 730 | sbi->s_desc_per_block = sb->s_blocksize / |
| 731 | sizeof (struct ext2_group_desc); |
| 732 | sbi->s_sbh = bh; |
| 733 | sbi->s_mount_state = le16_to_cpu(es->s_state); |
| 734 | sbi->s_addr_per_block_bits = |
| 735 | log2 (EXT2_ADDR_PER_BLOCK(sb)); |
| 736 | sbi->s_desc_per_block_bits = |
| 737 | log2 (EXT2_DESC_PER_BLOCK(sb)); |
| 738 | |
| 739 | if (sb->s_magic != EXT2_SUPER_MAGIC) |
| 740 | goto cantfind_ext2; |
| 741 | |
| 742 | if (sb->s_blocksize != bh->b_size) { |
| 743 | if (!silent) |
| 744 | printk ("VFS: Unsupported blocksize on dev " |
| 745 | "%s.\n", sb->s_id); |
| 746 | goto failed_mount; |
| 747 | } |
| 748 | |
| 749 | if (sb->s_blocksize != sbi->s_frag_size) { |
| 750 | printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n", |
| 751 | sbi->s_frag_size, sb->s_blocksize); |
| 752 | goto failed_mount; |
| 753 | } |
| 754 | |
| 755 | if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { |
| 756 | printk ("EXT2-fs: #blocks per group too big: %lu\n", |
| 757 | sbi->s_blocks_per_group); |
| 758 | goto failed_mount; |
| 759 | } |
| 760 | if (sbi->s_frags_per_group > sb->s_blocksize * 8) { |
| 761 | printk ("EXT2-fs: #fragments per group too big: %lu\n", |
| 762 | sbi->s_frags_per_group); |
| 763 | goto failed_mount; |
| 764 | } |
| 765 | if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { |
| 766 | printk ("EXT2-fs: #inodes per group too big: %lu\n", |
| 767 | sbi->s_inodes_per_group); |
| 768 | goto failed_mount; |
| 769 | } |
| 770 | |
| 771 | if (EXT2_BLOCKS_PER_GROUP(sb) == 0) |
| 772 | goto cantfind_ext2; |
| 773 | sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) - |
| 774 | le32_to_cpu(es->s_first_data_block) + |
| 775 | EXT2_BLOCKS_PER_GROUP(sb) - 1) / |
| 776 | EXT2_BLOCKS_PER_GROUP(sb); |
| 777 | db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / |
| 778 | EXT2_DESC_PER_BLOCK(sb); |
| 779 | sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL); |
| 780 | if (sbi->s_group_desc == NULL) { |
| 781 | printk ("EXT2-fs: not enough memory\n"); |
| 782 | goto failed_mount; |
| 783 | } |
| 784 | percpu_counter_init(&sbi->s_freeblocks_counter); |
| 785 | percpu_counter_init(&sbi->s_freeinodes_counter); |
| 786 | percpu_counter_init(&sbi->s_dirs_counter); |
| 787 | bgl_lock_init(&sbi->s_blockgroup_lock); |
| 788 | sbi->s_debts = kmalloc(sbi->s_groups_count * sizeof(*sbi->s_debts), |
| 789 | GFP_KERNEL); |
| 790 | if (!sbi->s_debts) { |
| 791 | printk ("EXT2-fs: not enough memory\n"); |
| 792 | goto failed_mount_group_desc; |
| 793 | } |
| 794 | memset(sbi->s_debts, 0, sbi->s_groups_count * sizeof(*sbi->s_debts)); |
| 795 | for (i = 0; i < db_count; i++) { |
| 796 | block = descriptor_loc(sb, logic_sb_block, i); |
| 797 | sbi->s_group_desc[i] = sb_bread(sb, block); |
| 798 | if (!sbi->s_group_desc[i]) { |
| 799 | for (j = 0; j < i; j++) |
| 800 | brelse (sbi->s_group_desc[j]); |
| 801 | printk ("EXT2-fs: unable to read group descriptors\n"); |
| 802 | goto failed_mount_group_desc; |
| 803 | } |
| 804 | } |
| 805 | if (!ext2_check_descriptors (sb)) { |
| 806 | printk ("EXT2-fs: group descriptors corrupted!\n"); |
| 807 | db_count = i; |
| 808 | goto failed_mount2; |
| 809 | } |
| 810 | sbi->s_gdb_count = db_count; |
| 811 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); |
| 812 | spin_lock_init(&sbi->s_next_gen_lock); |
| 813 | /* |
| 814 | * set up enough so that it can read an inode |
| 815 | */ |
| 816 | sb->s_op = &ext2_sops; |
| 817 | sb->s_export_op = &ext2_export_ops; |
| 818 | sb->s_xattr = ext2_xattr_handlers; |
| 819 | root = iget(sb, EXT2_ROOT_INO); |
| 820 | sb->s_root = d_alloc_root(root); |
| 821 | if (!sb->s_root) { |
| 822 | iput(root); |
| 823 | printk(KERN_ERR "EXT2-fs: get root inode failed\n"); |
| 824 | goto failed_mount2; |
| 825 | } |
| 826 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { |
| 827 | dput(sb->s_root); |
| 828 | sb->s_root = NULL; |
| 829 | printk(KERN_ERR "EXT2-fs: corrupt root inode, run e2fsck\n"); |
| 830 | goto failed_mount2; |
| 831 | } |
| 832 | if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) |
| 833 | ext2_warning(sb, __FUNCTION__, |
| 834 | "mounting ext3 filesystem as ext2\n"); |
| 835 | ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY); |
| 836 | percpu_counter_mod(&sbi->s_freeblocks_counter, |
| 837 | ext2_count_free_blocks(sb)); |
| 838 | percpu_counter_mod(&sbi->s_freeinodes_counter, |
| 839 | ext2_count_free_inodes(sb)); |
| 840 | percpu_counter_mod(&sbi->s_dirs_counter, |
| 841 | ext2_count_dirs(sb)); |
| 842 | return 0; |
| 843 | |
| 844 | cantfind_ext2: |
| 845 | if (!silent) |
| 846 | printk("VFS: Can't find an ext2 filesystem on dev %s.\n", |
| 847 | sb->s_id); |
| 848 | goto failed_mount; |
| 849 | |
| 850 | failed_mount2: |
| 851 | for (i = 0; i < db_count; i++) |
| 852 | brelse(sbi->s_group_desc[i]); |
| 853 | failed_mount_group_desc: |
| 854 | kfree(sbi->s_group_desc); |
| 855 | kfree(sbi->s_debts); |
| 856 | failed_mount: |
| 857 | brelse(bh); |
| 858 | failed_sbi: |
| 859 | sb->s_fs_info = NULL; |
| 860 | kfree(sbi); |
| 861 | return -EINVAL; |
| 862 | } |
| 863 | |
| 864 | static void ext2_commit_super (struct super_block * sb, |
| 865 | struct ext2_super_block * es) |
| 866 | { |
| 867 | es->s_wtime = cpu_to_le32(get_seconds()); |
| 868 | mark_buffer_dirty(EXT2_SB(sb)->s_sbh); |
| 869 | sb->s_dirt = 0; |
| 870 | } |
| 871 | |
| 872 | static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es) |
| 873 | { |
| 874 | es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); |
| 875 | es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); |
| 876 | es->s_wtime = cpu_to_le32(get_seconds()); |
| 877 | mark_buffer_dirty(EXT2_SB(sb)->s_sbh); |
| 878 | sync_dirty_buffer(EXT2_SB(sb)->s_sbh); |
| 879 | sb->s_dirt = 0; |
| 880 | } |
| 881 | |
| 882 | /* |
| 883 | * In the second extended file system, it is not necessary to |
| 884 | * write the super block since we use a mapping of the |
| 885 | * disk super block in a buffer. |
| 886 | * |
| 887 | * However, this function is still used to set the fs valid |
| 888 | * flags to 0. We need to set this flag to 0 since the fs |
| 889 | * may have been checked while mounted and e2fsck may have |
| 890 | * set s_state to EXT2_VALID_FS after some corrections. |
| 891 | */ |
| 892 | |
| 893 | void ext2_write_super (struct super_block * sb) |
| 894 | { |
| 895 | struct ext2_super_block * es; |
| 896 | lock_kernel(); |
| 897 | if (!(sb->s_flags & MS_RDONLY)) { |
| 898 | es = EXT2_SB(sb)->s_es; |
| 899 | |
| 900 | if (le16_to_cpu(es->s_state) & EXT2_VALID_FS) { |
| 901 | ext2_debug ("setting valid to 0\n"); |
| 902 | es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & |
| 903 | ~EXT2_VALID_FS); |
| 904 | es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); |
| 905 | es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); |
| 906 | es->s_mtime = cpu_to_le32(get_seconds()); |
| 907 | ext2_sync_super(sb, es); |
| 908 | } else |
| 909 | ext2_commit_super (sb, es); |
| 910 | } |
| 911 | sb->s_dirt = 0; |
| 912 | unlock_kernel(); |
| 913 | } |
| 914 | |
| 915 | static int ext2_remount (struct super_block * sb, int * flags, char * data) |
| 916 | { |
| 917 | struct ext2_sb_info * sbi = EXT2_SB(sb); |
| 918 | struct ext2_super_block * es; |
| 919 | |
| 920 | /* |
| 921 | * Allow the "check" option to be passed as a remount option. |
| 922 | */ |
| 923 | if (!parse_options (data, sbi)) |
| 924 | return -EINVAL; |
| 925 | |
| 926 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | |
| 927 | ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); |
| 928 | |
| 929 | es = sbi->s_es; |
| 930 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
| 931 | return 0; |
| 932 | if (*flags & MS_RDONLY) { |
| 933 | if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || |
| 934 | !(sbi->s_mount_state & EXT2_VALID_FS)) |
| 935 | return 0; |
| 936 | /* |
| 937 | * OK, we are remounting a valid rw partition rdonly, so set |
| 938 | * the rdonly flag and then mark the partition as valid again. |
| 939 | */ |
| 940 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
| 941 | es->s_mtime = cpu_to_le32(get_seconds()); |
| 942 | } else { |
| 943 | __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, |
| 944 | ~EXT2_FEATURE_RO_COMPAT_SUPP); |
| 945 | if (ret) { |
| 946 | printk("EXT2-fs: %s: couldn't remount RDWR because of " |
| 947 | "unsupported optional features (%x).\n", |
| 948 | sb->s_id, le32_to_cpu(ret)); |
| 949 | return -EROFS; |
| 950 | } |
| 951 | /* |
| 952 | * Mounting a RDONLY partition read-write, so reread and |
| 953 | * store the current valid flag. (It may have been changed |
| 954 | * by e2fsck since we originally mounted the partition.) |
| 955 | */ |
| 956 | sbi->s_mount_state = le16_to_cpu(es->s_state); |
| 957 | if (!ext2_setup_super (sb, es, 0)) |
| 958 | sb->s_flags &= ~MS_RDONLY; |
| 959 | } |
| 960 | ext2_sync_super(sb, es); |
| 961 | return 0; |
| 962 | } |
| 963 | |
| 964 | static int ext2_statfs (struct super_block * sb, struct kstatfs * buf) |
| 965 | { |
| 966 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 967 | unsigned long overhead; |
| 968 | int i; |
| 969 | |
| 970 | if (test_opt (sb, MINIX_DF)) |
| 971 | overhead = 0; |
| 972 | else { |
| 973 | /* |
| 974 | * Compute the overhead (FS structures) |
| 975 | */ |
| 976 | |
| 977 | /* |
| 978 | * All of the blocks before first_data_block are |
| 979 | * overhead |
| 980 | */ |
| 981 | overhead = le32_to_cpu(sbi->s_es->s_first_data_block); |
| 982 | |
| 983 | /* |
| 984 | * Add the overhead attributed to the superblock and |
| 985 | * block group descriptors. If the sparse superblocks |
| 986 | * feature is turned on, then not all groups have this. |
| 987 | */ |
| 988 | for (i = 0; i < sbi->s_groups_count; i++) |
| 989 | overhead += ext2_bg_has_super(sb, i) + |
| 990 | ext2_bg_num_gdb(sb, i); |
| 991 | |
| 992 | /* |
| 993 | * Every block group has an inode bitmap, a block |
| 994 | * bitmap, and an inode table. |
| 995 | */ |
| 996 | overhead += (sbi->s_groups_count * |
| 997 | (2 + sbi->s_itb_per_group)); |
| 998 | } |
| 999 | |
| 1000 | buf->f_type = EXT2_SUPER_MAGIC; |
| 1001 | buf->f_bsize = sb->s_blocksize; |
| 1002 | buf->f_blocks = le32_to_cpu(sbi->s_es->s_blocks_count) - overhead; |
| 1003 | buf->f_bfree = ext2_count_free_blocks(sb); |
| 1004 | buf->f_bavail = buf->f_bfree - le32_to_cpu(sbi->s_es->s_r_blocks_count); |
| 1005 | if (buf->f_bfree < le32_to_cpu(sbi->s_es->s_r_blocks_count)) |
| 1006 | buf->f_bavail = 0; |
| 1007 | buf->f_files = le32_to_cpu(sbi->s_es->s_inodes_count); |
| 1008 | buf->f_ffree = ext2_count_free_inodes (sb); |
| 1009 | buf->f_namelen = EXT2_NAME_LEN; |
| 1010 | return 0; |
| 1011 | } |
| 1012 | |
| 1013 | static struct super_block *ext2_get_sb(struct file_system_type *fs_type, |
| 1014 | int flags, const char *dev_name, void *data) |
| 1015 | { |
| 1016 | return get_sb_bdev(fs_type, flags, dev_name, data, ext2_fill_super); |
| 1017 | } |
| 1018 | |
| 1019 | #ifdef CONFIG_QUOTA |
| 1020 | |
| 1021 | /* Read data from quotafile - avoid pagecache and such because we cannot afford |
| 1022 | * acquiring the locks... As quota files are never truncated and quota code |
| 1023 | * itself serializes the operations (and noone else should touch the files) |
| 1024 | * we don't have to be afraid of races */ |
| 1025 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, |
| 1026 | size_t len, loff_t off) |
| 1027 | { |
| 1028 | struct inode *inode = sb_dqopt(sb)->files[type]; |
| 1029 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); |
| 1030 | int err = 0; |
| 1031 | int offset = off & (sb->s_blocksize - 1); |
| 1032 | int tocopy; |
| 1033 | size_t toread; |
| 1034 | struct buffer_head tmp_bh; |
| 1035 | struct buffer_head *bh; |
| 1036 | loff_t i_size = i_size_read(inode); |
| 1037 | |
| 1038 | if (off > i_size) |
| 1039 | return 0; |
| 1040 | if (off+len > i_size) |
| 1041 | len = i_size-off; |
| 1042 | toread = len; |
| 1043 | while (toread > 0) { |
| 1044 | tocopy = sb->s_blocksize - offset < toread ? |
| 1045 | sb->s_blocksize - offset : toread; |
| 1046 | |
| 1047 | tmp_bh.b_state = 0; |
| 1048 | err = ext2_get_block(inode, blk, &tmp_bh, 0); |
| 1049 | if (err) |
| 1050 | return err; |
| 1051 | if (!buffer_mapped(&tmp_bh)) /* A hole? */ |
| 1052 | memset(data, 0, tocopy); |
| 1053 | else { |
| 1054 | bh = sb_bread(sb, tmp_bh.b_blocknr); |
| 1055 | if (!bh) |
| 1056 | return -EIO; |
| 1057 | memcpy(data, bh->b_data+offset, tocopy); |
| 1058 | brelse(bh); |
| 1059 | } |
| 1060 | offset = 0; |
| 1061 | toread -= tocopy; |
| 1062 | data += tocopy; |
| 1063 | blk++; |
| 1064 | } |
| 1065 | return len; |
| 1066 | } |
| 1067 | |
| 1068 | /* Write to quotafile */ |
| 1069 | static ssize_t ext2_quota_write(struct super_block *sb, int type, |
| 1070 | const char *data, size_t len, loff_t off) |
| 1071 | { |
| 1072 | struct inode *inode = sb_dqopt(sb)->files[type]; |
| 1073 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); |
| 1074 | int err = 0; |
| 1075 | int offset = off & (sb->s_blocksize - 1); |
| 1076 | int tocopy; |
| 1077 | size_t towrite = len; |
| 1078 | struct buffer_head tmp_bh; |
| 1079 | struct buffer_head *bh; |
| 1080 | |
| 1081 | down(&inode->i_sem); |
| 1082 | while (towrite > 0) { |
| 1083 | tocopy = sb->s_blocksize - offset < towrite ? |
| 1084 | sb->s_blocksize - offset : towrite; |
| 1085 | |
| 1086 | tmp_bh.b_state = 0; |
| 1087 | err = ext2_get_block(inode, blk, &tmp_bh, 1); |
| 1088 | if (err) |
| 1089 | goto out; |
| 1090 | if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) |
| 1091 | bh = sb_bread(sb, tmp_bh.b_blocknr); |
| 1092 | else |
| 1093 | bh = sb_getblk(sb, tmp_bh.b_blocknr); |
| 1094 | if (!bh) { |
| 1095 | err = -EIO; |
| 1096 | goto out; |
| 1097 | } |
| 1098 | lock_buffer(bh); |
| 1099 | memcpy(bh->b_data+offset, data, tocopy); |
| 1100 | flush_dcache_page(bh->b_page); |
| 1101 | set_buffer_uptodate(bh); |
| 1102 | mark_buffer_dirty(bh); |
| 1103 | unlock_buffer(bh); |
| 1104 | brelse(bh); |
| 1105 | offset = 0; |
| 1106 | towrite -= tocopy; |
| 1107 | data += tocopy; |
| 1108 | blk++; |
| 1109 | } |
| 1110 | out: |
| 1111 | if (len == towrite) |
| 1112 | return err; |
| 1113 | if (inode->i_size < off+len-towrite) |
| 1114 | i_size_write(inode, off+len-towrite); |
| 1115 | inode->i_version++; |
| 1116 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| 1117 | mark_inode_dirty(inode); |
| 1118 | up(&inode->i_sem); |
| 1119 | return len - towrite; |
| 1120 | } |
| 1121 | |
| 1122 | #endif |
| 1123 | |
| 1124 | static struct file_system_type ext2_fs_type = { |
| 1125 | .owner = THIS_MODULE, |
| 1126 | .name = "ext2", |
| 1127 | .get_sb = ext2_get_sb, |
| 1128 | .kill_sb = kill_block_super, |
| 1129 | .fs_flags = FS_REQUIRES_DEV, |
| 1130 | }; |
| 1131 | |
| 1132 | static int __init init_ext2_fs(void) |
| 1133 | { |
| 1134 | int err = init_ext2_xattr(); |
| 1135 | if (err) |
| 1136 | return err; |
| 1137 | err = init_inodecache(); |
| 1138 | if (err) |
| 1139 | goto out1; |
| 1140 | err = register_filesystem(&ext2_fs_type); |
| 1141 | if (err) |
| 1142 | goto out; |
| 1143 | return 0; |
| 1144 | out: |
| 1145 | destroy_inodecache(); |
| 1146 | out1: |
| 1147 | exit_ext2_xattr(); |
| 1148 | return err; |
| 1149 | } |
| 1150 | |
| 1151 | static void __exit exit_ext2_fs(void) |
| 1152 | { |
| 1153 | unregister_filesystem(&ext2_fs_type); |
| 1154 | destroy_inodecache(); |
| 1155 | exit_ext2_xattr(); |
| 1156 | } |
| 1157 | |
| 1158 | module_init(init_ext2_fs) |
| 1159 | module_exit(exit_ext2_fs) |