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