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 dentry *dentry, 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 SLAB_MEM_SPREAD), 103 init_once, NULL); 104 if (affs_inode_cachep == NULL) 105 return -ENOMEM; 106 return 0; 107 } 108 109 static void destroy_inodecache(void) 110 { 111 if (kmem_cache_destroy(affs_inode_cachep)) 112 printk(KERN_INFO "affs_inode_cache: not all structures were freed\n"); 113 } 114 115 static struct super_operations affs_sops = { 116 .alloc_inode = affs_alloc_inode, 117 .destroy_inode = affs_destroy_inode, 118 .read_inode = affs_read_inode, 119 .write_inode = affs_write_inode, 120 .put_inode = affs_put_inode, 121 .delete_inode = affs_delete_inode, 122 .clear_inode = affs_clear_inode, 123 .put_super = affs_put_super, 124 .write_super = affs_write_super, 125 .statfs = affs_statfs, 126 .remount_fs = affs_remount, 127 }; 128 129 enum { 130 Opt_bs, Opt_mode, Opt_mufs, Opt_prefix, Opt_protect, 131 Opt_reserved, Opt_root, Opt_setgid, Opt_setuid, 132 Opt_verbose, Opt_volume, Opt_ignore, Opt_err, 133 }; 134 135 static match_table_t tokens = { 136 {Opt_bs, "bs=%u"}, 137 {Opt_mode, "mode=%o"}, 138 {Opt_mufs, "mufs"}, 139 {Opt_prefix, "prefix=%s"}, 140 {Opt_protect, "protect"}, 141 {Opt_reserved, "reserved=%u"}, 142 {Opt_root, "root=%u"}, 143 {Opt_setgid, "setgid=%u"}, 144 {Opt_setuid, "setuid=%u"}, 145 {Opt_verbose, "verbose"}, 146 {Opt_volume, "volume=%s"}, 147 {Opt_ignore, "grpquota"}, 148 {Opt_ignore, "noquota"}, 149 {Opt_ignore, "quota"}, 150 {Opt_ignore, "usrquota"}, 151 {Opt_err, NULL}, 152 }; 153 154 static int 155 parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root, 156 int *blocksize, char **prefix, char *volume, unsigned long *mount_opts) 157 { 158 char *p; 159 substring_t args[MAX_OPT_ARGS]; 160 161 /* Fill in defaults */ 162 163 *uid = current->uid; 164 *gid = current->gid; 165 *reserved = 2; 166 *root = -1; 167 *blocksize = -1; 168 volume[0] = ':'; 169 volume[1] = 0; 170 *mount_opts = 0; 171 if (!options) 172 return 1; 173 174 while ((p = strsep(&options, ",")) != NULL) { 175 int token, n, option; 176 if (!*p) 177 continue; 178 179 token = match_token(p, tokens, args); 180 switch (token) { 181 case Opt_bs: 182 if (match_int(&args[0], &n)) 183 return -EINVAL; 184 if (n != 512 && n != 1024 && n != 2048 185 && n != 4096) { 186 printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n"); 187 return 0; 188 } 189 *blocksize = n; 190 break; 191 case Opt_mode: 192 if (match_octal(&args[0], &option)) 193 return 1; 194 *mode = option & 0777; 195 *mount_opts |= SF_SETMODE; 196 break; 197 case Opt_mufs: 198 *mount_opts |= SF_MUFS; 199 break; 200 case Opt_prefix: 201 /* Free any previous prefix */ 202 kfree(*prefix); 203 *prefix = NULL; 204 *prefix = match_strdup(&args[0]); 205 if (!*prefix) 206 return 0; 207 *mount_opts |= SF_PREFIX; 208 break; 209 case Opt_protect: 210 *mount_opts |= SF_IMMUTABLE; 211 break; 212 case Opt_reserved: 213 if (match_int(&args[0], reserved)) 214 return 1; 215 break; 216 case Opt_root: 217 if (match_int(&args[0], root)) 218 return 1; 219 break; 220 case Opt_setgid: 221 if (match_int(&args[0], &option)) 222 return 1; 223 *gid = option; 224 *mount_opts |= SF_SETGID; 225 break; 226 case Opt_setuid: 227 if (match_int(&args[0], &option)) 228 return -EINVAL; 229 *uid = option; 230 *mount_opts |= SF_SETUID; 231 break; 232 case Opt_verbose: 233 *mount_opts |= SF_VERBOSE; 234 break; 235 case Opt_volume: { 236 char *vol = match_strdup(&args[0]); 237 strlcpy(volume, vol, 32); 238 kfree(vol); 239 break; 240 } 241 case Opt_ignore: 242 /* Silently ignore the quota options */ 243 break; 244 default: 245 printk("AFFS: Unrecognized mount option \"%s\" " 246 "or missing value\n", p); 247 return 0; 248 } 249 } 250 return 1; 251 } 252 253 /* This function definitely needs to be split up. Some fine day I'll 254 * hopefully have the guts to do so. Until then: sorry for the mess. 255 */ 256 257 static int affs_fill_super(struct super_block *sb, void *data, int silent) 258 { 259 struct affs_sb_info *sbi; 260 struct buffer_head *root_bh = NULL; 261 struct buffer_head *boot_bh; 262 struct inode *root_inode = NULL; 263 s32 root_block; 264 int size, blocksize; 265 u32 chksum; 266 int num_bm; 267 int i, j; 268 s32 key; 269 uid_t uid; 270 gid_t gid; 271 int reserved; 272 unsigned long mount_flags; 273 int tmp_flags; /* fix remount prototype... */ 274 u8 sig[4]; 275 276 pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options"); 277 278 sb->s_magic = AFFS_SUPER_MAGIC; 279 sb->s_op = &affs_sops; 280 sb->s_flags |= MS_NODIRATIME; 281 282 sbi = kmalloc(sizeof(struct affs_sb_info), GFP_KERNEL); 283 if (!sbi) 284 return -ENOMEM; 285 sb->s_fs_info = sbi; 286 memset(sbi, 0, sizeof(*sbi)); 287 init_MUTEX(&sbi->s_bmlock); 288 289 if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block, 290 &blocksize,&sbi->s_prefix, 291 sbi->s_volume, &mount_flags)) { 292 printk(KERN_ERR "AFFS: Error parsing options\n"); 293 return -EINVAL; 294 } 295 /* N.B. after this point s_prefix must be released */ 296 297 sbi->s_flags = mount_flags; 298 sbi->s_mode = i; 299 sbi->s_uid = uid; 300 sbi->s_gid = gid; 301 sbi->s_reserved= reserved; 302 303 /* Get the size of the device in 512-byte blocks. 304 * If we later see that the partition uses bigger 305 * blocks, we will have to change it. 306 */ 307 308 size = sb->s_bdev->bd_inode->i_size >> 9; 309 pr_debug("AFFS: initial blocksize=%d, #blocks=%d\n", 512, size); 310 311 affs_set_blocksize(sb, PAGE_SIZE); 312 /* Try to find root block. Its location depends on the block size. */ 313 314 i = 512; 315 j = 4096; 316 if (blocksize > 0) { 317 i = j = blocksize; 318 size = size / (blocksize / 512); 319 } 320 for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) { 321 sbi->s_root_block = root_block; 322 if (root_block < 0) 323 sbi->s_root_block = (reserved + size - 1) / 2; 324 pr_debug("AFFS: setting blocksize to %d\n", blocksize); 325 affs_set_blocksize(sb, blocksize); 326 sbi->s_partition_size = size; 327 328 /* The root block location that was calculated above is not 329 * correct if the partition size is an odd number of 512- 330 * byte blocks, which will be rounded down to a number of 331 * 1024-byte blocks, and if there were an even number of 332 * reserved blocks. Ideally, all partition checkers should 333 * report the real number of blocks of the real blocksize, 334 * but since this just cannot be done, we have to try to 335 * find the root block anyways. In the above case, it is one 336 * block behind the calculated one. So we check this one, too. 337 */ 338 for (num_bm = 0; num_bm < 2; num_bm++) { 339 pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, " 340 "size=%d, reserved=%d\n", 341 sb->s_id, 342 sbi->s_root_block + num_bm, 343 blocksize, size, reserved); 344 root_bh = affs_bread(sb, sbi->s_root_block + num_bm); 345 if (!root_bh) 346 continue; 347 if (!affs_checksum_block(sb, root_bh) && 348 be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT && 349 be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) { 350 sbi->s_hashsize = blocksize / 4 - 56; 351 sbi->s_root_block += num_bm; 352 key = 1; 353 goto got_root; 354 } 355 affs_brelse(root_bh); 356 root_bh = NULL; 357 } 358 } 359 if (!silent) 360 printk(KERN_ERR "AFFS: No valid root block on device %s\n", 361 sb->s_id); 362 goto out_error; 363 364 /* N.B. after this point bh must be released */ 365 got_root: 366 root_block = sbi->s_root_block; 367 368 /* Find out which kind of FS we have */ 369 boot_bh = sb_bread(sb, 0); 370 if (!boot_bh) { 371 printk(KERN_ERR "AFFS: Cannot read boot block\n"); 372 goto out_error; 373 } 374 memcpy(sig, boot_bh->b_data, 4); 375 brelse(boot_bh); 376 chksum = be32_to_cpu(*(__be32 *)sig); 377 378 /* Dircache filesystems are compatible with non-dircache ones 379 * when reading. As long as they aren't supported, writing is 380 * not recommended. 381 */ 382 if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS 383 || chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) { 384 printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n", 385 sb->s_id); 386 sb->s_flags |= MS_RDONLY; 387 } 388 switch (chksum) { 389 case MUFS_FS: 390 case MUFS_INTLFFS: 391 case MUFS_DCFFS: 392 sbi->s_flags |= SF_MUFS; 393 /* fall thru */ 394 case FS_INTLFFS: 395 case FS_DCFFS: 396 sbi->s_flags |= SF_INTL; 397 break; 398 case MUFS_FFS: 399 sbi->s_flags |= SF_MUFS; 400 break; 401 case FS_FFS: 402 break; 403 case MUFS_OFS: 404 sbi->s_flags |= SF_MUFS; 405 /* fall thru */ 406 case FS_OFS: 407 sbi->s_flags |= SF_OFS; 408 sb->s_flags |= MS_NOEXEC; 409 break; 410 case MUFS_DCOFS: 411 case MUFS_INTLOFS: 412 sbi->s_flags |= SF_MUFS; 413 case FS_DCOFS: 414 case FS_INTLOFS: 415 sbi->s_flags |= SF_INTL | SF_OFS; 416 sb->s_flags |= MS_NOEXEC; 417 break; 418 default: 419 printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n", 420 sb->s_id, chksum); 421 goto out_error; 422 } 423 424 if (mount_flags & SF_VERBOSE) { 425 u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0]; 426 printk(KERN_NOTICE "AFFS: Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n", 427 len > 31 ? 31 : len, 428 AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1, 429 sig, sig[3] + '0', blocksize); 430 } 431 432 sb->s_flags |= MS_NODEV | MS_NOSUID; 433 434 sbi->s_data_blksize = sb->s_blocksize; 435 if (sbi->s_flags & SF_OFS) 436 sbi->s_data_blksize -= 24; 437 438 /* Keep super block in cache */ 439 sbi->s_root_bh = root_bh; 440 /* N.B. after this point s_root_bh must be released */ 441 442 tmp_flags = sb->s_flags; 443 if (affs_init_bitmap(sb, &tmp_flags)) 444 goto out_error; 445 sb->s_flags = tmp_flags; 446 447 /* set up enough so that it can read an inode */ 448 449 root_inode = iget(sb, root_block); 450 sb->s_root = d_alloc_root(root_inode); 451 if (!sb->s_root) { 452 printk(KERN_ERR "AFFS: Get root inode failed\n"); 453 goto out_error; 454 } 455 sb->s_root->d_op = &affs_dentry_operations; 456 457 pr_debug("AFFS: s_flags=%lX\n",sb->s_flags); 458 return 0; 459 460 /* 461 * Begin the cascaded cleanup ... 462 */ 463 out_error: 464 if (root_inode) 465 iput(root_inode); 466 kfree(sbi->s_bitmap); 467 affs_brelse(root_bh); 468 kfree(sbi->s_prefix); 469 kfree(sbi); 470 sb->s_fs_info = NULL; 471 return -EINVAL; 472 } 473 474 static int 475 affs_remount(struct super_block *sb, int *flags, char *data) 476 { 477 struct affs_sb_info *sbi = AFFS_SB(sb); 478 int blocksize; 479 uid_t uid; 480 gid_t gid; 481 int mode; 482 int reserved; 483 int root_block; 484 unsigned long mount_flags; 485 int res = 0; 486 487 pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data); 488 489 *flags |= MS_NODIRATIME; 490 491 if (!parse_options(data,&uid,&gid,&mode,&reserved,&root_block, 492 &blocksize,&sbi->s_prefix,sbi->s_volume,&mount_flags)) 493 return -EINVAL; 494 sbi->s_flags = mount_flags; 495 sbi->s_mode = mode; 496 sbi->s_uid = uid; 497 sbi->s_gid = gid; 498 499 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 500 return 0; 501 if (*flags & MS_RDONLY) { 502 sb->s_dirt = 1; 503 while (sb->s_dirt) 504 affs_write_super(sb); 505 affs_free_bitmap(sb); 506 } else 507 res = affs_init_bitmap(sb, flags); 508 509 return res; 510 } 511 512 static int 513 affs_statfs(struct dentry *dentry, struct kstatfs *buf) 514 { 515 struct super_block *sb = dentry->d_sb; 516 int free; 517 518 pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB(sb)->s_partition_size, 519 AFFS_SB(sb)->s_reserved); 520 521 free = affs_count_free_blocks(sb); 522 buf->f_type = AFFS_SUPER_MAGIC; 523 buf->f_bsize = sb->s_blocksize; 524 buf->f_blocks = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved; 525 buf->f_bfree = free; 526 buf->f_bavail = free; 527 return 0; 528 } 529 530 static int affs_get_sb(struct file_system_type *fs_type, 531 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 532 { 533 return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super, 534 mnt); 535 } 536 537 static struct file_system_type affs_fs_type = { 538 .owner = THIS_MODULE, 539 .name = "affs", 540 .get_sb = affs_get_sb, 541 .kill_sb = kill_block_super, 542 .fs_flags = FS_REQUIRES_DEV, 543 }; 544 545 static int __init init_affs_fs(void) 546 { 547 int err = init_inodecache(); 548 if (err) 549 goto out1; 550 err = register_filesystem(&affs_fs_type); 551 if (err) 552 goto out; 553 return 0; 554 out: 555 destroy_inodecache(); 556 out1: 557 return err; 558 } 559 560 static void __exit exit_affs_fs(void) 561 { 562 unregister_filesystem(&affs_fs_type); 563 destroy_inodecache(); 564 } 565 566 MODULE_DESCRIPTION("Amiga filesystem support for Linux"); 567 MODULE_LICENSE("GPL"); 568 569 module_init(init_affs_fs) 570 module_exit(exit_affs_fs) 571