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