1 /* 2 * linux/fs/befs/linuxvfs.c 3 * 4 * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com 5 * 6 */ 7 8 #include <linux/module.h> 9 #include <linux/slab.h> 10 #include <linux/fs.h> 11 #include <linux/errno.h> 12 #include <linux/stat.h> 13 #include <linux/nls.h> 14 #include <linux/buffer_head.h> 15 #include <linux/vfs.h> 16 #include <linux/parser.h> 17 #include <linux/namei.h> 18 #include <linux/sched.h> 19 20 #include "befs.h" 21 #include "btree.h" 22 #include "inode.h" 23 #include "datastream.h" 24 #include "super.h" 25 #include "io.h" 26 27 MODULE_DESCRIPTION("BeOS File System (BeFS) driver"); 28 MODULE_AUTHOR("Will Dyson"); 29 MODULE_LICENSE("GPL"); 30 31 /* The units the vfs expects inode->i_blocks to be in */ 32 #define VFS_BLOCK_SIZE 512 33 34 static int befs_readdir(struct file *, struct dir_context *); 35 static int befs_get_block(struct inode *, sector_t, struct buffer_head *, int); 36 static int befs_readpage(struct file *file, struct page *page); 37 static sector_t befs_bmap(struct address_space *mapping, sector_t block); 38 static struct dentry *befs_lookup(struct inode *, struct dentry *, unsigned int); 39 static struct inode *befs_iget(struct super_block *, unsigned long); 40 static struct inode *befs_alloc_inode(struct super_block *sb); 41 static void befs_destroy_inode(struct inode *inode); 42 static int befs_init_inodecache(void); 43 static void befs_destroy_inodecache(void); 44 static void *befs_follow_link(struct dentry *, struct nameidata *); 45 static void *befs_fast_follow_link(struct dentry *, struct nameidata *); 46 static int befs_utf2nls(struct super_block *sb, const char *in, int in_len, 47 char **out, int *out_len); 48 static int befs_nls2utf(struct super_block *sb, const char *in, int in_len, 49 char **out, int *out_len); 50 static void befs_put_super(struct super_block *); 51 static int befs_remount(struct super_block *, int *, char *); 52 static int befs_statfs(struct dentry *, struct kstatfs *); 53 static int parse_options(char *, befs_mount_options *); 54 55 static const struct super_operations befs_sops = { 56 .alloc_inode = befs_alloc_inode, /* allocate a new inode */ 57 .destroy_inode = befs_destroy_inode, /* deallocate an inode */ 58 .put_super = befs_put_super, /* uninit super */ 59 .statfs = befs_statfs, /* statfs */ 60 .remount_fs = befs_remount, 61 .show_options = generic_show_options, 62 }; 63 64 /* slab cache for befs_inode_info objects */ 65 static struct kmem_cache *befs_inode_cachep; 66 67 static const struct file_operations befs_dir_operations = { 68 .read = generic_read_dir, 69 .iterate = befs_readdir, 70 .llseek = generic_file_llseek, 71 }; 72 73 static const struct inode_operations befs_dir_inode_operations = { 74 .lookup = befs_lookup, 75 }; 76 77 static const struct address_space_operations befs_aops = { 78 .readpage = befs_readpage, 79 .bmap = befs_bmap, 80 }; 81 82 static const struct inode_operations befs_fast_symlink_inode_operations = { 83 .readlink = generic_readlink, 84 .follow_link = befs_fast_follow_link, 85 }; 86 87 static const struct inode_operations befs_symlink_inode_operations = { 88 .readlink = generic_readlink, 89 .follow_link = befs_follow_link, 90 .put_link = kfree_put_link, 91 }; 92 93 /* 94 * Called by generic_file_read() to read a page of data 95 * 96 * In turn, simply calls a generic block read function and 97 * passes it the address of befs_get_block, for mapping file 98 * positions to disk blocks. 99 */ 100 static int 101 befs_readpage(struct file *file, struct page *page) 102 { 103 return block_read_full_page(page, befs_get_block); 104 } 105 106 static sector_t 107 befs_bmap(struct address_space *mapping, sector_t block) 108 { 109 return generic_block_bmap(mapping, block, befs_get_block); 110 } 111 112 /* 113 * Generic function to map a file position (block) to a 114 * disk offset (passed back in bh_result). 115 * 116 * Used by many higher level functions. 117 * 118 * Calls befs_fblock2brun() in datastream.c to do the real work. 119 * 120 * -WD 10-26-01 121 */ 122 123 static int 124 befs_get_block(struct inode *inode, sector_t block, 125 struct buffer_head *bh_result, int create) 126 { 127 struct super_block *sb = inode->i_sb; 128 befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; 129 befs_block_run run = BAD_IADDR; 130 int res = 0; 131 ulong disk_off; 132 133 befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld", 134 inode->i_ino, block); 135 136 if (block < 0) { 137 befs_error(sb, "befs_get_block() was asked for a block " 138 "number less than zero: block %ld in inode %lu", 139 block, inode->i_ino); 140 return -EIO; 141 } 142 143 if (create) { 144 befs_error(sb, "befs_get_block() was asked to write to " 145 "block %ld in inode %lu", block, inode->i_ino); 146 return -EPERM; 147 } 148 149 res = befs_fblock2brun(sb, ds, block, &run); 150 if (res != BEFS_OK) { 151 befs_error(sb, 152 "<--- befs_get_block() for inode %lu, block " 153 "%ld ERROR", inode->i_ino, block); 154 return -EFBIG; 155 } 156 157 disk_off = (ulong) iaddr2blockno(sb, &run); 158 159 map_bh(bh_result, inode->i_sb, disk_off); 160 161 befs_debug(sb, "<--- befs_get_block() for inode %lu, block %ld, " 162 "disk address %lu", inode->i_ino, block, disk_off); 163 164 return 0; 165 } 166 167 static struct dentry * 168 befs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) 169 { 170 struct inode *inode = NULL; 171 struct super_block *sb = dir->i_sb; 172 befs_data_stream *ds = &BEFS_I(dir)->i_data.ds; 173 befs_off_t offset; 174 int ret; 175 int utfnamelen; 176 char *utfname; 177 const char *name = dentry->d_name.name; 178 179 befs_debug(sb, "---> befs_lookup() " 180 "name %s inode %ld", dentry->d_name.name, dir->i_ino); 181 182 /* Convert to UTF-8 */ 183 if (BEFS_SB(sb)->nls) { 184 ret = 185 befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen); 186 if (ret < 0) { 187 befs_debug(sb, "<--- befs_lookup() ERROR"); 188 return ERR_PTR(ret); 189 } 190 ret = befs_btree_find(sb, ds, utfname, &offset); 191 kfree(utfname); 192 193 } else { 194 ret = befs_btree_find(sb, ds, dentry->d_name.name, &offset); 195 } 196 197 if (ret == BEFS_BT_NOT_FOUND) { 198 befs_debug(sb, "<--- befs_lookup() %s not found", 199 dentry->d_name.name); 200 return ERR_PTR(-ENOENT); 201 202 } else if (ret != BEFS_OK || offset == 0) { 203 befs_warning(sb, "<--- befs_lookup() Error"); 204 return ERR_PTR(-ENODATA); 205 } 206 207 inode = befs_iget(dir->i_sb, (ino_t) offset); 208 if (IS_ERR(inode)) 209 return ERR_CAST(inode); 210 211 d_add(dentry, inode); 212 213 befs_debug(sb, "<--- befs_lookup()"); 214 215 return NULL; 216 } 217 218 static int 219 befs_readdir(struct file *file, struct dir_context *ctx) 220 { 221 struct inode *inode = file_inode(file); 222 struct super_block *sb = inode->i_sb; 223 befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; 224 befs_off_t value; 225 int result; 226 size_t keysize; 227 unsigned char d_type; 228 char keybuf[BEFS_NAME_LEN + 1]; 229 const char *dirname = file->f_path.dentry->d_name.name; 230 231 befs_debug(sb, "---> befs_readdir() " 232 "name %s, inode %ld, ctx->pos %Ld", 233 dirname, inode->i_ino, ctx->pos); 234 235 more: 236 result = befs_btree_read(sb, ds, ctx->pos, BEFS_NAME_LEN + 1, 237 keybuf, &keysize, &value); 238 239 if (result == BEFS_ERR) { 240 befs_debug(sb, "<--- befs_readdir() ERROR"); 241 befs_error(sb, "IO error reading %s (inode %lu)", 242 dirname, inode->i_ino); 243 return -EIO; 244 245 } else if (result == BEFS_BT_END) { 246 befs_debug(sb, "<--- befs_readdir() END"); 247 return 0; 248 249 } else if (result == BEFS_BT_EMPTY) { 250 befs_debug(sb, "<--- befs_readdir() Empty directory"); 251 return 0; 252 } 253 254 d_type = DT_UNKNOWN; 255 256 /* Convert to NLS */ 257 if (BEFS_SB(sb)->nls) { 258 char *nlsname; 259 int nlsnamelen; 260 result = 261 befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen); 262 if (result < 0) { 263 befs_debug(sb, "<--- befs_readdir() ERROR"); 264 return result; 265 } 266 if (!dir_emit(ctx, nlsname, nlsnamelen, 267 (ino_t) value, d_type)) { 268 kfree(nlsname); 269 return 0; 270 } 271 kfree(nlsname); 272 } else { 273 if (!dir_emit(ctx, keybuf, keysize, 274 (ino_t) value, d_type)) 275 return 0; 276 } 277 ctx->pos++; 278 goto more; 279 280 befs_debug(sb, "<--- befs_readdir() pos %Ld", ctx->pos); 281 282 return 0; 283 } 284 285 static struct inode * 286 befs_alloc_inode(struct super_block *sb) 287 { 288 struct befs_inode_info *bi; 289 bi = (struct befs_inode_info *)kmem_cache_alloc(befs_inode_cachep, 290 GFP_KERNEL); 291 if (!bi) 292 return NULL; 293 return &bi->vfs_inode; 294 } 295 296 static void befs_i_callback(struct rcu_head *head) 297 { 298 struct inode *inode = container_of(head, struct inode, i_rcu); 299 kmem_cache_free(befs_inode_cachep, BEFS_I(inode)); 300 } 301 302 static void befs_destroy_inode(struct inode *inode) 303 { 304 call_rcu(&inode->i_rcu, befs_i_callback); 305 } 306 307 static void init_once(void *foo) 308 { 309 struct befs_inode_info *bi = (struct befs_inode_info *) foo; 310 311 inode_init_once(&bi->vfs_inode); 312 } 313 314 static struct inode *befs_iget(struct super_block *sb, unsigned long ino) 315 { 316 struct buffer_head *bh = NULL; 317 befs_inode *raw_inode = NULL; 318 319 befs_sb_info *befs_sb = BEFS_SB(sb); 320 befs_inode_info *befs_ino = NULL; 321 struct inode *inode; 322 long ret = -EIO; 323 324 befs_debug(sb, "---> befs_read_inode() " "inode = %lu", ino); 325 326 inode = iget_locked(sb, ino); 327 if (!inode) 328 return ERR_PTR(-ENOMEM); 329 if (!(inode->i_state & I_NEW)) 330 return inode; 331 332 befs_ino = BEFS_I(inode); 333 334 /* convert from vfs's inode number to befs's inode number */ 335 befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino); 336 337 befs_debug(sb, " real inode number [%u, %hu, %hu]", 338 befs_ino->i_inode_num.allocation_group, 339 befs_ino->i_inode_num.start, befs_ino->i_inode_num.len); 340 341 bh = befs_bread(sb, inode->i_ino); 342 if (!bh) { 343 befs_error(sb, "unable to read inode block - " 344 "inode = %lu", inode->i_ino); 345 goto unacquire_none; 346 } 347 348 raw_inode = (befs_inode *) bh->b_data; 349 350 befs_dump_inode(sb, raw_inode); 351 352 if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) { 353 befs_error(sb, "Bad inode: %lu", inode->i_ino); 354 goto unacquire_bh; 355 } 356 357 inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode); 358 359 /* 360 * set uid and gid. But since current BeOS is single user OS, so 361 * you can change by "uid" or "gid" options. 362 */ 363 364 inode->i_uid = befs_sb->mount_opts.use_uid ? 365 befs_sb->mount_opts.uid : 366 make_kuid(&init_user_ns, fs32_to_cpu(sb, raw_inode->uid)); 367 inode->i_gid = befs_sb->mount_opts.use_gid ? 368 befs_sb->mount_opts.gid : 369 make_kgid(&init_user_ns, fs32_to_cpu(sb, raw_inode->gid)); 370 371 set_nlink(inode, 1); 372 373 /* 374 * BEFS's time is 64 bits, but current VFS is 32 bits... 375 * BEFS don't have access time. Nor inode change time. VFS 376 * doesn't have creation time. 377 * Also, the lower 16 bits of the last_modified_time and 378 * create_time are just a counter to help ensure uniqueness 379 * for indexing purposes. (PFD, page 54) 380 */ 381 382 inode->i_mtime.tv_sec = 383 fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16; 384 inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */ 385 inode->i_ctime = inode->i_mtime; 386 inode->i_atime = inode->i_mtime; 387 388 befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num); 389 befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent); 390 befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes); 391 befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags); 392 393 if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){ 394 inode->i_size = 0; 395 inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE; 396 strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink, 397 BEFS_SYMLINK_LEN - 1); 398 befs_ino->i_data.symlink[BEFS_SYMLINK_LEN - 1] = '\0'; 399 } else { 400 int num_blks; 401 402 befs_ino->i_data.ds = 403 fsds_to_cpu(sb, &raw_inode->data.datastream); 404 405 num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds); 406 inode->i_blocks = 407 num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE); 408 inode->i_size = befs_ino->i_data.ds.size; 409 } 410 411 inode->i_mapping->a_ops = &befs_aops; 412 413 if (S_ISREG(inode->i_mode)) { 414 inode->i_fop = &generic_ro_fops; 415 } else if (S_ISDIR(inode->i_mode)) { 416 inode->i_op = &befs_dir_inode_operations; 417 inode->i_fop = &befs_dir_operations; 418 } else if (S_ISLNK(inode->i_mode)) { 419 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) 420 inode->i_op = &befs_symlink_inode_operations; 421 else 422 inode->i_op = &befs_fast_symlink_inode_operations; 423 } else { 424 befs_error(sb, "Inode %lu is not a regular file, " 425 "directory or symlink. THAT IS WRONG! BeFS has no " 426 "on disk special files", inode->i_ino); 427 goto unacquire_bh; 428 } 429 430 brelse(bh); 431 befs_debug(sb, "<--- befs_read_inode()"); 432 unlock_new_inode(inode); 433 return inode; 434 435 unacquire_bh: 436 brelse(bh); 437 438 unacquire_none: 439 iget_failed(inode); 440 befs_debug(sb, "<--- befs_read_inode() - Bad inode"); 441 return ERR_PTR(ret); 442 } 443 444 /* Initialize the inode cache. Called at fs setup. 445 * 446 * Taken from NFS implementation by Al Viro. 447 */ 448 static int 449 befs_init_inodecache(void) 450 { 451 befs_inode_cachep = kmem_cache_create("befs_inode_cache", 452 sizeof (struct befs_inode_info), 453 0, (SLAB_RECLAIM_ACCOUNT| 454 SLAB_MEM_SPREAD), 455 init_once); 456 if (befs_inode_cachep == NULL) { 457 printk(KERN_ERR "befs_init_inodecache: " 458 "Couldn't initialize inode slabcache\n"); 459 return -ENOMEM; 460 } 461 462 return 0; 463 } 464 465 /* Called at fs teardown. 466 * 467 * Taken from NFS implementation by Al Viro. 468 */ 469 static void 470 befs_destroy_inodecache(void) 471 { 472 /* 473 * Make sure all delayed rcu free inodes are flushed before we 474 * destroy cache. 475 */ 476 rcu_barrier(); 477 kmem_cache_destroy(befs_inode_cachep); 478 } 479 480 /* 481 * The inode of symbolic link is different to data stream. 482 * The data stream become link name. Unless the LONG_SYMLINK 483 * flag is set. 484 */ 485 static void * 486 befs_follow_link(struct dentry *dentry, struct nameidata *nd) 487 { 488 struct super_block *sb = dentry->d_sb; 489 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); 490 befs_data_stream *data = &befs_ino->i_data.ds; 491 befs_off_t len = data->size; 492 char *link; 493 494 if (len == 0) { 495 befs_error(sb, "Long symlink with illegal length"); 496 link = ERR_PTR(-EIO); 497 } else { 498 befs_debug(sb, "Follow long symlink"); 499 500 link = kmalloc(len, GFP_NOFS); 501 if (!link) { 502 link = ERR_PTR(-ENOMEM); 503 } else if (befs_read_lsymlink(sb, data, link, len) != len) { 504 kfree(link); 505 befs_error(sb, "Failed to read entire long symlink"); 506 link = ERR_PTR(-EIO); 507 } else { 508 link[len - 1] = '\0'; 509 } 510 } 511 nd_set_link(nd, link); 512 return NULL; 513 } 514 515 516 static void * 517 befs_fast_follow_link(struct dentry *dentry, struct nameidata *nd) 518 { 519 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); 520 nd_set_link(nd, befs_ino->i_data.symlink); 521 return NULL; 522 } 523 524 /* 525 * UTF-8 to NLS charset convert routine 526 * 527 * 528 * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than 529 * the nls tables directly 530 */ 531 532 static int 533 befs_utf2nls(struct super_block *sb, const char *in, 534 int in_len, char **out, int *out_len) 535 { 536 struct nls_table *nls = BEFS_SB(sb)->nls; 537 int i, o; 538 unicode_t uni; 539 int unilen, utflen; 540 char *result; 541 /* The utf8->nls conversion won't make the final nls string bigger 542 * than the utf one, but if the string is pure ascii they'll have the 543 * same width and an extra char is needed to save the additional \0 544 */ 545 int maxlen = in_len + 1; 546 547 befs_debug(sb, "---> utf2nls()"); 548 549 if (!nls) { 550 befs_error(sb, "befs_utf2nls called with no NLS table loaded"); 551 return -EINVAL; 552 } 553 554 *out = result = kmalloc(maxlen, GFP_NOFS); 555 if (!*out) { 556 befs_error(sb, "befs_utf2nls() cannot allocate memory"); 557 *out_len = 0; 558 return -ENOMEM; 559 } 560 561 for (i = o = 0; i < in_len; i += utflen, o += unilen) { 562 563 /* convert from UTF-8 to Unicode */ 564 utflen = utf8_to_utf32(&in[i], in_len - i, &uni); 565 if (utflen < 0) 566 goto conv_err; 567 568 /* convert from Unicode to nls */ 569 if (uni > MAX_WCHAR_T) 570 goto conv_err; 571 unilen = nls->uni2char(uni, &result[o], in_len - o); 572 if (unilen < 0) 573 goto conv_err; 574 } 575 result[o] = '\0'; 576 *out_len = o; 577 578 befs_debug(sb, "<--- utf2nls()"); 579 580 return o; 581 582 conv_err: 583 befs_error(sb, "Name using character set %s contains a character that " 584 "cannot be converted to unicode.", nls->charset); 585 befs_debug(sb, "<--- utf2nls()"); 586 kfree(result); 587 return -EILSEQ; 588 } 589 590 /** 591 * befs_nls2utf - Convert NLS string to utf8 encodeing 592 * @sb: Superblock 593 * @src: Input string buffer in NLS format 594 * @srclen: Length of input string in bytes 595 * @dest: The output string in UTF-8 format 596 * @destlen: Length of the output buffer 597 * 598 * Converts input string @src, which is in the format of the loaded NLS map, 599 * into a utf8 string. 600 * 601 * The destination string @dest is allocated by this function and the caller is 602 * responsible for freeing it with kfree() 603 * 604 * On return, *@destlen is the length of @dest in bytes. 605 * 606 * On success, the return value is the number of utf8 characters written to 607 * the output buffer @dest. 608 * 609 * On Failure, a negative number coresponding to the error code is returned. 610 */ 611 612 static int 613 befs_nls2utf(struct super_block *sb, const char *in, 614 int in_len, char **out, int *out_len) 615 { 616 struct nls_table *nls = BEFS_SB(sb)->nls; 617 int i, o; 618 wchar_t uni; 619 int unilen, utflen; 620 char *result; 621 /* There're nls characters that will translate to 3-chars-wide UTF-8 622 * characters, a additional byte is needed to save the final \0 623 * in special cases */ 624 int maxlen = (3 * in_len) + 1; 625 626 befs_debug(sb, "---> nls2utf()\n"); 627 628 if (!nls) { 629 befs_error(sb, "befs_nls2utf called with no NLS table loaded."); 630 return -EINVAL; 631 } 632 633 *out = result = kmalloc(maxlen, GFP_NOFS); 634 if (!*out) { 635 befs_error(sb, "befs_nls2utf() cannot allocate memory"); 636 *out_len = 0; 637 return -ENOMEM; 638 } 639 640 for (i = o = 0; i < in_len; i += unilen, o += utflen) { 641 642 /* convert from nls to unicode */ 643 unilen = nls->char2uni(&in[i], in_len - i, &uni); 644 if (unilen < 0) 645 goto conv_err; 646 647 /* convert from unicode to UTF-8 */ 648 utflen = utf32_to_utf8(uni, &result[o], 3); 649 if (utflen <= 0) 650 goto conv_err; 651 } 652 653 result[o] = '\0'; 654 *out_len = o; 655 656 befs_debug(sb, "<--- nls2utf()"); 657 658 return i; 659 660 conv_err: 661 befs_error(sb, "Name using charecter set %s contains a charecter that " 662 "cannot be converted to unicode.", nls->charset); 663 befs_debug(sb, "<--- nls2utf()"); 664 kfree(result); 665 return -EILSEQ; 666 } 667 668 /** 669 * Use the 670 * 671 */ 672 enum { 673 Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err, 674 }; 675 676 static const match_table_t befs_tokens = { 677 {Opt_uid, "uid=%d"}, 678 {Opt_gid, "gid=%d"}, 679 {Opt_charset, "iocharset=%s"}, 680 {Opt_debug, "debug"}, 681 {Opt_err, NULL} 682 }; 683 684 static int 685 parse_options(char *options, befs_mount_options * opts) 686 { 687 char *p; 688 substring_t args[MAX_OPT_ARGS]; 689 int option; 690 kuid_t uid; 691 kgid_t gid; 692 693 /* Initialize options */ 694 opts->uid = GLOBAL_ROOT_UID; 695 opts->gid = GLOBAL_ROOT_GID; 696 opts->use_uid = 0; 697 opts->use_gid = 0; 698 opts->iocharset = NULL; 699 opts->debug = 0; 700 701 if (!options) 702 return 1; 703 704 while ((p = strsep(&options, ",")) != NULL) { 705 int token; 706 if (!*p) 707 continue; 708 709 token = match_token(p, befs_tokens, args); 710 switch (token) { 711 case Opt_uid: 712 if (match_int(&args[0], &option)) 713 return 0; 714 uid = INVALID_UID; 715 if (option >= 0) 716 uid = make_kuid(current_user_ns(), option); 717 if (!uid_valid(uid)) { 718 printk(KERN_ERR "BeFS: Invalid uid %d, " 719 "using default\n", option); 720 break; 721 } 722 opts->uid = uid; 723 opts->use_uid = 1; 724 break; 725 case Opt_gid: 726 if (match_int(&args[0], &option)) 727 return 0; 728 gid = INVALID_GID; 729 if (option >= 0) 730 gid = make_kgid(current_user_ns(), option); 731 if (!gid_valid(gid)) { 732 printk(KERN_ERR "BeFS: Invalid gid %d, " 733 "using default\n", option); 734 break; 735 } 736 opts->gid = gid; 737 opts->use_gid = 1; 738 break; 739 case Opt_charset: 740 kfree(opts->iocharset); 741 opts->iocharset = match_strdup(&args[0]); 742 if (!opts->iocharset) { 743 printk(KERN_ERR "BeFS: allocation failure for " 744 "iocharset string\n"); 745 return 0; 746 } 747 break; 748 case Opt_debug: 749 opts->debug = 1; 750 break; 751 default: 752 printk(KERN_ERR "BeFS: Unrecognized mount option \"%s\" " 753 "or missing value\n", p); 754 return 0; 755 } 756 } 757 return 1; 758 } 759 760 /* This function has the responsibiltiy of getting the 761 * filesystem ready for unmounting. 762 * Basically, we free everything that we allocated in 763 * befs_read_inode 764 */ 765 static void 766 befs_put_super(struct super_block *sb) 767 { 768 kfree(BEFS_SB(sb)->mount_opts.iocharset); 769 BEFS_SB(sb)->mount_opts.iocharset = NULL; 770 unload_nls(BEFS_SB(sb)->nls); 771 kfree(sb->s_fs_info); 772 sb->s_fs_info = NULL; 773 } 774 775 /* Allocate private field of the superblock, fill it. 776 * 777 * Finish filling the public superblock fields 778 * Make the root directory 779 * Load a set of NLS translations if needed. 780 */ 781 static int 782 befs_fill_super(struct super_block *sb, void *data, int silent) 783 { 784 struct buffer_head *bh; 785 befs_sb_info *befs_sb; 786 befs_super_block *disk_sb; 787 struct inode *root; 788 long ret = -EINVAL; 789 const unsigned long sb_block = 0; 790 const off_t x86_sb_off = 512; 791 792 save_mount_options(sb, data); 793 794 sb->s_fs_info = kmalloc(sizeof (*befs_sb), GFP_KERNEL); 795 if (sb->s_fs_info == NULL) { 796 printk(KERN_ERR 797 "BeFS(%s): Unable to allocate memory for private " 798 "portion of superblock. Bailing.\n", sb->s_id); 799 goto unacquire_none; 800 } 801 befs_sb = BEFS_SB(sb); 802 memset(befs_sb, 0, sizeof(befs_sb_info)); 803 804 if (!parse_options((char *) data, &befs_sb->mount_opts)) { 805 befs_error(sb, "cannot parse mount options"); 806 goto unacquire_priv_sbp; 807 } 808 809 befs_debug(sb, "---> befs_fill_super()"); 810 811 #ifndef CONFIG_BEFS_RW 812 if (!(sb->s_flags & MS_RDONLY)) { 813 befs_warning(sb, 814 "No write support. Marking filesystem read-only"); 815 sb->s_flags |= MS_RDONLY; 816 } 817 #endif /* CONFIG_BEFS_RW */ 818 819 /* 820 * Set dummy blocksize to read super block. 821 * Will be set to real fs blocksize later. 822 * 823 * Linux 2.4.10 and later refuse to read blocks smaller than 824 * the hardsect size for the device. But we also need to read at 825 * least 1k to get the second 512 bytes of the volume. 826 * -WD 10-26-01 827 */ 828 sb_min_blocksize(sb, 1024); 829 830 if (!(bh = sb_bread(sb, sb_block))) { 831 befs_error(sb, "unable to read superblock"); 832 goto unacquire_priv_sbp; 833 } 834 835 /* account for offset of super block on x86 */ 836 disk_sb = (befs_super_block *) bh->b_data; 837 if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) || 838 (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) { 839 befs_debug(sb, "Using PPC superblock location"); 840 } else { 841 befs_debug(sb, "Using x86 superblock location"); 842 disk_sb = 843 (befs_super_block *) ((void *) bh->b_data + x86_sb_off); 844 } 845 846 if (befs_load_sb(sb, disk_sb) != BEFS_OK) 847 goto unacquire_bh; 848 849 befs_dump_super_block(sb, disk_sb); 850 851 brelse(bh); 852 853 if (befs_check_sb(sb) != BEFS_OK) 854 goto unacquire_priv_sbp; 855 856 if( befs_sb->num_blocks > ~((sector_t)0) ) { 857 befs_error(sb, "blocks count: %Lu " 858 "is larger than the host can use", 859 befs_sb->num_blocks); 860 goto unacquire_priv_sbp; 861 } 862 863 /* 864 * set up enough so that it can read an inode 865 * Fill in kernel superblock fields from private sb 866 */ 867 sb->s_magic = BEFS_SUPER_MAGIC; 868 /* Set real blocksize of fs */ 869 sb_set_blocksize(sb, (ulong) befs_sb->block_size); 870 sb->s_op = &befs_sops; 871 root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir))); 872 if (IS_ERR(root)) { 873 ret = PTR_ERR(root); 874 goto unacquire_priv_sbp; 875 } 876 sb->s_root = d_make_root(root); 877 if (!sb->s_root) { 878 befs_error(sb, "get root inode failed"); 879 goto unacquire_priv_sbp; 880 } 881 882 /* load nls library */ 883 if (befs_sb->mount_opts.iocharset) { 884 befs_debug(sb, "Loading nls: %s", 885 befs_sb->mount_opts.iocharset); 886 befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset); 887 if (!befs_sb->nls) { 888 befs_warning(sb, "Cannot load nls %s" 889 " loading default nls", 890 befs_sb->mount_opts.iocharset); 891 befs_sb->nls = load_nls_default(); 892 } 893 /* load default nls if none is specified in mount options */ 894 } else { 895 befs_debug(sb, "Loading default nls"); 896 befs_sb->nls = load_nls_default(); 897 } 898 899 return 0; 900 /*****************/ 901 unacquire_bh: 902 brelse(bh); 903 904 unacquire_priv_sbp: 905 kfree(befs_sb->mount_opts.iocharset); 906 kfree(sb->s_fs_info); 907 908 unacquire_none: 909 sb->s_fs_info = NULL; 910 return ret; 911 } 912 913 static int 914 befs_remount(struct super_block *sb, int *flags, char *data) 915 { 916 if (!(*flags & MS_RDONLY)) 917 return -EINVAL; 918 return 0; 919 } 920 921 static int 922 befs_statfs(struct dentry *dentry, struct kstatfs *buf) 923 { 924 struct super_block *sb = dentry->d_sb; 925 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 926 927 befs_debug(sb, "---> befs_statfs()"); 928 929 buf->f_type = BEFS_SUPER_MAGIC; 930 buf->f_bsize = sb->s_blocksize; 931 buf->f_blocks = BEFS_SB(sb)->num_blocks; 932 buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks; 933 buf->f_bavail = buf->f_bfree; 934 buf->f_files = 0; /* UNKNOWN */ 935 buf->f_ffree = 0; /* UNKNOWN */ 936 buf->f_fsid.val[0] = (u32)id; 937 buf->f_fsid.val[1] = (u32)(id >> 32); 938 buf->f_namelen = BEFS_NAME_LEN; 939 940 befs_debug(sb, "<--- befs_statfs()"); 941 942 return 0; 943 } 944 945 static struct dentry * 946 befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, 947 void *data) 948 { 949 return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super); 950 } 951 952 static struct file_system_type befs_fs_type = { 953 .owner = THIS_MODULE, 954 .name = "befs", 955 .mount = befs_mount, 956 .kill_sb = kill_block_super, 957 .fs_flags = FS_REQUIRES_DEV, 958 }; 959 MODULE_ALIAS_FS("befs"); 960 961 static int __init 962 init_befs_fs(void) 963 { 964 int err; 965 966 printk(KERN_INFO "BeFS version: %s\n", BEFS_VERSION); 967 968 err = befs_init_inodecache(); 969 if (err) 970 goto unacquire_none; 971 972 err = register_filesystem(&befs_fs_type); 973 if (err) 974 goto unacquire_inodecache; 975 976 return 0; 977 978 unacquire_inodecache: 979 befs_destroy_inodecache(); 980 981 unacquire_none: 982 return err; 983 } 984 985 static void __exit 986 exit_befs_fs(void) 987 { 988 befs_destroy_inodecache(); 989 990 unregister_filesystem(&befs_fs_type); 991 } 992 993 /* 994 Macros that typecheck the init and exit functions, 995 ensures that they are called at init and cleanup, 996 and eliminates warnings about unused functions. 997 */ 998 module_init(init_befs_fs) 999 module_exit(exit_befs_fs) 1000