1 /* 2 * linux/fs/affs/inode.c 3 * 4 * (c) 1996 Hans-Joachim Widmaier - Rewritten 5 * 6 * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem. 7 * 8 * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem. 9 * 10 * (C) 1991 Linus Torvalds - minix filesystem 11 */ 12 13 #include <linux/module.h> 14 #include <linux/init.h> 15 #include <linux/statfs.h> 16 #include <linux/parser.h> 17 #include "affs.h" 18 19 extern struct timezone sys_tz; 20 21 static int affs_statfs(struct super_block *sb, struct kstatfs *buf); 22 static int affs_remount (struct super_block *sb, int *flags, char *data); 23 24 static void 25 affs_put_super(struct super_block *sb) 26 { 27 struct affs_sb_info *sbi = AFFS_SB(sb); 28 pr_debug("AFFS: put_super()\n"); 29 30 if (!(sb->s_flags & MS_RDONLY)) { 31 AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(1); 32 secs_to_datestamp(get_seconds(), 33 &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change); 34 affs_fix_checksum(sb, sbi->s_root_bh); 35 mark_buffer_dirty(sbi->s_root_bh); 36 } 37 38 kfree(sbi->s_prefix); 39 affs_free_bitmap(sb); 40 affs_brelse(sbi->s_root_bh); 41 kfree(sbi); 42 sb->s_fs_info = NULL; 43 return; 44 } 45 46 static void 47 affs_write_super(struct super_block *sb) 48 { 49 int clean = 2; 50 struct affs_sb_info *sbi = AFFS_SB(sb); 51 52 if (!(sb->s_flags & MS_RDONLY)) { 53 // if (sbi->s_bitmap[i].bm_bh) { 54 // if (buffer_dirty(sbi->s_bitmap[i].bm_bh)) { 55 // clean = 0; 56 AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(clean); 57 secs_to_datestamp(get_seconds(), 58 &AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->disk_change); 59 affs_fix_checksum(sb, sbi->s_root_bh); 60 mark_buffer_dirty(sbi->s_root_bh); 61 sb->s_dirt = !clean; /* redo until bitmap synced */ 62 } else 63 sb->s_dirt = 0; 64 65 pr_debug("AFFS: write_super() at %lu, clean=%d\n", get_seconds(), clean); 66 } 67 68 static kmem_cache_t * affs_inode_cachep; 69 70 static struct inode *affs_alloc_inode(struct super_block *sb) 71 { 72 struct affs_inode_info *ei; 73 ei = (struct affs_inode_info *)kmem_cache_alloc(affs_inode_cachep, SLAB_KERNEL); 74 if (!ei) 75 return NULL; 76 ei->vfs_inode.i_version = 1; 77 return &ei->vfs_inode; 78 } 79 80 static void affs_destroy_inode(struct inode *inode) 81 { 82 kmem_cache_free(affs_inode_cachep, AFFS_I(inode)); 83 } 84 85 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) 86 { 87 struct affs_inode_info *ei = (struct affs_inode_info *) foo; 88 89 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == 90 SLAB_CTOR_CONSTRUCTOR) { 91 init_MUTEX(&ei->i_link_lock); 92 init_MUTEX(&ei->i_ext_lock); 93 inode_init_once(&ei->vfs_inode); 94 } 95 } 96 97 static int init_inodecache(void) 98 { 99 affs_inode_cachep = kmem_cache_create("affs_inode_cache", 100 sizeof(struct affs_inode_info), 101 0, SLAB_RECLAIM_ACCOUNT, 102 init_once, NULL); 103 if (affs_inode_cachep == NULL) 104 return -ENOMEM; 105 return 0; 106 } 107 108 static void destroy_inodecache(void) 109 { 110 if (kmem_cache_destroy(affs_inode_cachep)) 111 printk(KERN_INFO "affs_inode_cache: not all structures were freed\n"); 112 } 113 114 static struct super_operations affs_sops = { 115 .alloc_inode = affs_alloc_inode, 116 .destroy_inode = affs_destroy_inode, 117 .read_inode = affs_read_inode, 118 .write_inode = affs_write_inode, 119 .put_inode = affs_put_inode, 120 .delete_inode = affs_delete_inode, 121 .clear_inode = affs_clear_inode, 122 .put_super = affs_put_super, 123 .write_super = affs_write_super, 124 .statfs = affs_statfs, 125 .remount_fs = affs_remount, 126 }; 127 128 enum { 129 Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect, 130 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid, 131 Opt_verbose, Opt_volume, Opt_ignore, Opt_err, 132 }; 133 134 static match_table_t tokens = { 135 {Opt_bs, "bs=%u"}, 136 {Opt_mode, "mode=%o"}, 137 {Opt_mufs, "mufs"}, 138 {Opt_prefix, "prefix=%s"}, 139 {Opt_protect, "protect"}, 140 {Opt_reserved, "reserved=%u"}, 141 {Opt_root, "root=%u"}, 142 {Opt_setgid, "setgid=%u"}, 143 {Opt_setuid, "setuid=%u"}, 144 {Opt_verbose, "verbose"}, 145 {Opt_volume, "volume=%s"}, 146 {Opt_ignore, "grpquota"}, 147 {Opt_ignore, "noquota"}, 148 {Opt_ignore, "quota"}, 149 {Opt_ignore, "usrquota"}, 150 {Opt_err, NULL}, 151 }; 152 153 static int 154 parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root, 155 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts) 156 { 157 char *p; 158 substring_t args[MAX_OPT_ARGS]; 159 160 /* Fill in defaults */ 161 162 *uid = current->uid; 163 *gid = current->gid; 164 *reserved = 2; 165 *root = -1; 166 *blocksize = -1; 167 volume[0] = ':'; 168 volume[1] = 0; 169 *mount_opts = 0; 170 if (!options) 171 return 1; 172 173 while ((p = strsep(&options, ",")) != NULL) { 174 int token, n, option; 175 if (!*p) 176 continue; 177 178 token = match_token(p, tokens, args); 179 switch (token) { 180 case Opt_bs: 181 if (match_int(&args[0], &n)) 182 return -EINVAL; 183 if (n != 512 && n != 1024 && n != 2048 184 && n != 4096) { 185 printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n"); 186 return 0; 187 } 188 *blocksize = n; 189 break; 190 case Opt_mode: 191 if (match_octal(&args[0], &option)) 192 return 1; 193 *mode = option & 0777; 194 *mount_opts |= SF_SETMODE; 195 break; 196 case Opt_mufs: 197 *mount_opts |= SF_MUFS; 198 break; 199 case Opt_prefix: 200 /* Free any previous prefix */ 201 kfree(*prefix); 202 *prefix = NULL; 203 *prefix = match_strdup(&args[0]); 204 if (!*prefix) 205 return 0; 206 *mount_opts |= SF_PREFIX; 207 break; 208 case Opt_protect: 209 *mount_opts |= SF_IMMUTABLE; 210 break; 211 case Opt_reserved: 212 if (match_int(&args[0], reserved)) 213 return 1; 214 break; 215 case Opt_root: 216 if (match_int(&args[0], root)) 217 return 1; 218 break; 219 case Opt_setgid: 220 if (match_int(&args[0], &option)) 221 return 1; 222 *gid = option; 223 *mount_opts |= SF_SETGID; 224 break; 225 case Opt_setuid: 226 if (match_int(&args[0], &option)) 227 return -EINVAL; 228 *uid = option; 229 *mount_opts |= SF_SETUID; 230 break; 231 case Opt_verbose: 232 *mount_opts |= SF_VERBOSE; 233 break; 234 case Opt_volume: { 235 char *vol = match_strdup(&args[0]); 236 strlcpy(volume, vol, 32); 237 kfree(vol); 238 break; 239 } 240 case Opt_ignore: 241 /* Silently ignore the quota options */ 242 break; 243 default: 244 printk("AFFS: Unrecognized mount option \"%s\" " 245 "or missing value\n", p); 246 return 0; 247 } 248 } 249 return 1; 250 } 251 252 /* This function definitely needs to be split up. Some fine day I'll 253 * hopefully have the guts to do so. Until then: sorry for the mess. 254 */ 255 256 static int affs_fill_super(struct super_block *sb, void *data, int silent) 257 { 258 struct affs_sb_info *sbi; 259 struct buffer_head *root_bh = NULL; 260 struct buffer_head *boot_bh; 261 struct inode *root_inode = NULL; 262 s32 root_block; 263 int size, blocksize; 264 u32 chksum; 265 int num_bm; 266 int i, j; 267 s32 key; 268 uid_t uid; 269 gid_t gid; 270 int reserved; 271 unsigned long mount_flags; 272 int tmp_flags; /* fix remount prototype... */ 273 274 pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options"); 275 276 sb->s_magic = AFFS_SUPER_MAGIC; 277 sb->s_op = &affs_sops; 278 sb->s_flags |= MS_NODIRATIME; 279 280 sbi = kmalloc(sizeof(struct affs_sb_info), GFP_KERNEL); 281 if (!sbi) 282 return -ENOMEM; 283 sb->s_fs_info = sbi; 284 memset(sbi, 0, sizeof(*sbi)); 285 init_MUTEX(&sbi->s_bmlock); 286 287 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block, 288 &blocksize,&sbi->s_prefix, 289 sbi->s_volume, &mount_flags)) { 290 printk(KERN_ERR "AFFS: Error parsing options\n"); 291 return -EINVAL; 292 } 293 /* N.B. after this point s_prefix must be released */ 294 295 sbi->s_flags = mount_flags; 296 sbi->s_mode = i; 297 sbi->s_uid = uid; 298 sbi->s_gid = gid; 299 sbi->s_reserved= reserved; 300 301 /* Get the size of the device in 512-byte blocks. 302 * If we later see that the partition uses bigger 303 * blocks, we will have to change it. 304 */ 305 306 size = sb->s_bdev->bd_inode->i_size >> 9; 307 pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size); 308 309 affs_set_blocksize(sb, PAGE_SIZE); 310 /* Try to find root block. Its location depends on the block size. */ 311 312 i = 512; 313 j = 4096; 314 if (blocksize > 0) { 315 i = j = blocksize; 316 size = size / (blocksize / 512); 317 } 318 for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) { 319 sbi->s_root_block = root_block; 320 if (root_block < 0) 321 sbi->s_root_block = (reserved + size - 1) / 2; 322 pr_debug("AFFS: setting blocksize to %d\n", blocksize); 323 affs_set_blocksize(sb, blocksize); 324 sbi->s_partition_size = size; 325 326 /* The root block location that was calculated above is not 327 * correct if the partition size is an odd number of 512- 328 * byte blocks, which will be rounded down to a number of 329 * 1024-byte blocks, and if there were an even number of 330 * reserved blocks. Ideally, all partition checkers should 331 * report the real number of blocks of the real blocksize, 332 * but since this just cannot be done, we have to try to 333 * find the root block anyways. In the above case, it is one 334 * block behind the calculated one. So we check this one, too. 335 */ 336 for (num_bm = 0; num_bm < 2; num_bm++) { 337 pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, " 338 "size=%d, reserved=%d\n", 339 sb->s_id, 340 sbi->s_root_block + num_bm, 341 blocksize, size, reserved); 342 root_bh = affs_bread(sb, sbi->s_root_block + num_bm); 343 if (!root_bh) 344 continue; 345 if (!affs_checksum_block(sb, root_bh) && 346 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT && 347 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) { 348 sbi->s_hashsize = blocksize / 4 - 56; 349 sbi->s_root_block += num_bm; 350 key = 1; 351 goto got_root; 352 } 353 affs_brelse(root_bh); 354 root_bh = NULL; 355 } 356 } 357 if (!silent) 358 printk(KERN_ERR "AFFS: No valid root block on device %s\n", 359 sb->s_id); 360 goto out_error; 361 362 /* N.B. after this point bh must be released */ 363 got_root: 364 root_block = sbi->s_root_block; 365 366 /* Find out which kind of FS we have */ 367 boot_bh = sb_bread(sb, 0); 368 if (!boot_bh) { 369 printk(KERN_ERR "AFFS: Cannot read boot block\n"); 370 goto out_error; 371 } 372 chksum = be32_to_cpu(*(__be32 *)boot_bh->b_data); 373 brelse(boot_bh); 374 375 /* Dircache filesystems are compatible with non-dircache ones 376 * when reading. As long as they aren't supported, writing is 377 * not recommended. 378 */ 379 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS 380 || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) { 381 printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n", 382 sb->s_id); 383 sb->s_flags |= MS_RDONLY; 384 } 385 switch (chksum) { 386 case MUFS_FS: 387 case MUFS_INTLFFS: 388 case MUFS_DCFFS: 389 sbi->s_flags |= SF_MUFS; 390 /* fall thru */ 391 case FS_INTLFFS: 392 case FS_DCFFS: 393 sbi->s_flags |= SF_INTL; 394 break; 395 case MUFS_FFS: 396 sbi->s_flags |= SF_MUFS; 397 break; 398 case FS_FFS: 399 break; 400 case MUFS_OFS: 401 sbi->s_flags |= SF_MUFS; 402 /* fall thru */ 403 case FS_OFS: 404 sbi->s_flags |= SF_OFS; 405 sb->s_flags |= MS_NOEXEC; 406 break; 407 case MUFS_DCOFS: 408 case MUFS_INTLOFS: 409 sbi->s_flags |= SF_MUFS; 410 case FS_DCOFS: 411 case FS_INTLOFS: 412 sbi->s_flags |= SF_INTL | SF_OFS; 413 sb->s_flags |= MS_NOEXEC; 414 break; 415 default: 416 printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n", 417 sb->s_id, chksum); 418 goto out_error; 419 } 420 421 if (mount_flags & SF_VERBOSE) { 422 chksum = cpu_to_be32(chksum); 423 printk(KERN_NOTICE "AFFS: Mounting volume \"%*s\": Type=%.3s\\%c, Blocksize=%d\n", 424 AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0], 425 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1, 426 (char *)&chksum,((char *)&chksum)[3] + '0',blocksize); 427 } 428 429 sb->s_flags |= MS_NODEV | MS_NOSUID; 430 431 sbi->s_data_blksize = sb->s_blocksize; 432 if (sbi->s_flags & SF_OFS) 433 sbi->s_data_blksize -= 24; 434 435 /* Keep super block in cache */ 436 sbi->s_root_bh = root_bh; 437 /* N.B. after this point s_root_bh must be released */ 438 439 tmp_flags = sb->s_flags; 440 if (affs_init_bitmap(sb, &tmp_flags)) 441 goto out_error; 442 sb->s_flags = tmp_flags; 443 444 /* set up enough so that it can read an inode */ 445 446 root_inode = iget(sb, root_block); 447 sb->s_root = d_alloc_root(root_inode); 448 if (!sb->s_root) { 449 printk(KERN_ERR "AFFS: Get root inode failed\n"); 450 goto out_error; 451 } 452 sb->s_root->d_op = &affs_dentry_operations; 453 454 pr_debug("AFFS: s_flags=%lX\n",sb->s_flags); 455 return 0; 456 457 /* 458 * Begin the cascaded cleanup ... 459 */ 460 out_error: 461 if (root_inode) 462 iput(root_inode); 463 kfree(sbi->s_bitmap); 464 affs_brelse(root_bh); 465 kfree(sbi->s_prefix); 466 kfree(sbi); 467 sb->s_fs_info = NULL; 468 return -EINVAL; 469 } 470 471 static int 472 affs_remount(struct super_block *sb, int *flags, char *data) 473 { 474 struct affs_sb_info *sbi = AFFS_SB(sb); 475 int blocksize; 476 uid_t uid; 477 gid_t gid; 478 int mode; 479 int reserved; 480 int root_block; 481 unsigned long mount_flags; 482 int res = 0; 483 484 pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data); 485 486 *flags |= MS_NODIRATIME; 487 488 if (!parse_options(data,&uid,&gid,&mode,&reserved,&root_block, 489 &blocksize,&sbi->s_prefix,sbi->s_volume,&mount_flags)) 490 return -EINVAL; 491 sbi->s_flags = mount_flags; 492 sbi->s_mode = mode; 493 sbi->s_uid = uid; 494 sbi->s_gid = gid; 495 496 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 497 return 0; 498 if (*flags & MS_RDONLY) { 499 sb->s_dirt = 1; 500 while (sb->s_dirt) 501 affs_write_super(sb); 502 affs_free_bitmap(sb); 503 } else 504 res = affs_init_bitmap(sb, flags); 505 506 return res; 507 } 508 509 static int 510 affs_statfs(struct super_block *sb, struct kstatfs *buf) 511 { 512 int free; 513 514 pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size, 515 AFFS_SB(sb)->s_reserved); 516 517 free = affs_count_free_blocks(sb); 518 buf->f_type = AFFS_SUPER_MAGIC; 519 buf->f_bsize = sb->s_blocksize; 520 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved; 521 buf->f_bfree = free; 522 buf->f_bavail = free; 523 return 0; 524 } 525 526 static struct super_block *affs_get_sb(struct file_system_type *fs_type, 527 int flags, const char *dev_name, void *data) 528 { 529 return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super); 530 } 531 532 static struct file_system_type affs_fs_type = { 533 .owner = THIS_MODULE, 534 .name = "affs", 535 .get_sb = affs_get_sb, 536 .kill_sb = kill_block_super, 537 .fs_flags = FS_REQUIRES_DEV, 538 }; 539 540 static int __init init_affs_fs(void) 541 { 542 int err = init_inodecache(); 543 if (err) 544 goto out1; 545 err = register_filesystem(&affs_fs_type); 546 if (err) 547 goto out; 548 return 0; 549 out: 550 destroy_inodecache(); 551 out1: 552 return err; 553 } 554 555 static void __exit exit_affs_fs(void) 556 { 557 unregister_filesystem(&affs_fs_type); 558 destroy_inodecache(); 559 } 560 561 MODULE_DESCRIPTION("Amiga filesystem support for Linux"); 562 MODULE_LICENSE("GPL"); 563 564 module_init(init_affs_fs) 565 module_exit(exit_affs_fs) 566