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 *, void *, filldir_t); 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_put_link(struct dentry *, struct nameidata *, void *); 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 .readdir = 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_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, unsigned int flags) 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 = file_inode(filp); 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 kmem_cache_free(befs_inode_cachep, BEFS_I(inode)); 291 } 292 293 static void befs_destroy_inode(struct inode *inode) 294 { 295 call_rcu(&inode->i_rcu, befs_i_callback); 296 } 297 298 static void init_once(void *foo) 299 { 300 struct befs_inode_info *bi = (struct befs_inode_info *) foo; 301 302 inode_init_once(&bi->vfs_inode); 303 } 304 305 static struct inode *befs_iget(struct super_block *sb, unsigned long ino) 306 { 307 struct buffer_head *bh = NULL; 308 befs_inode *raw_inode = NULL; 309 310 befs_sb_info *befs_sb = BEFS_SB(sb); 311 befs_inode_info *befs_ino = NULL; 312 struct inode *inode; 313 long ret = -EIO; 314 315 befs_debug(sb, "---> befs_read_inode() " "inode = %lu", ino); 316 317 inode = iget_locked(sb, ino); 318 if (IS_ERR(inode)) 319 return inode; 320 if (!(inode->i_state & I_NEW)) 321 return inode; 322 323 befs_ino = BEFS_I(inode); 324 325 /* convert from vfs's inode number to befs's inode number */ 326 befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino); 327 328 befs_debug(sb, " real inode number [%u, %hu, %hu]", 329 befs_ino->i_inode_num.allocation_group, 330 befs_ino->i_inode_num.start, befs_ino->i_inode_num.len); 331 332 bh = befs_bread(sb, inode->i_ino); 333 if (!bh) { 334 befs_error(sb, "unable to read inode block - " 335 "inode = %lu", inode->i_ino); 336 goto unacquire_none; 337 } 338 339 raw_inode = (befs_inode *) bh->b_data; 340 341 befs_dump_inode(sb, raw_inode); 342 343 if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) { 344 befs_error(sb, "Bad inode: %lu", inode->i_ino); 345 goto unacquire_bh; 346 } 347 348 inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode); 349 350 /* 351 * set uid and gid. But since current BeOS is single user OS, so 352 * you can change by "uid" or "gid" options. 353 */ 354 355 inode->i_uid = befs_sb->mount_opts.use_uid ? 356 befs_sb->mount_opts.uid : 357 make_kuid(&init_user_ns, fs32_to_cpu(sb, raw_inode->uid)); 358 inode->i_gid = befs_sb->mount_opts.use_gid ? 359 befs_sb->mount_opts.gid : 360 make_kgid(&init_user_ns, fs32_to_cpu(sb, raw_inode->gid)); 361 362 set_nlink(inode, 1); 363 364 /* 365 * BEFS's time is 64 bits, but current VFS is 32 bits... 366 * BEFS don't have access time. Nor inode change time. VFS 367 * doesn't have creation time. 368 * Also, the lower 16 bits of the last_modified_time and 369 * create_time are just a counter to help ensure uniqueness 370 * for indexing purposes. (PFD, page 54) 371 */ 372 373 inode->i_mtime.tv_sec = 374 fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16; 375 inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */ 376 inode->i_ctime = inode->i_mtime; 377 inode->i_atime = inode->i_mtime; 378 379 befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num); 380 befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent); 381 befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes); 382 befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags); 383 384 if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){ 385 inode->i_size = 0; 386 inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE; 387 strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink, 388 BEFS_SYMLINK_LEN - 1); 389 befs_ino->i_data.symlink[BEFS_SYMLINK_LEN - 1] = '\0'; 390 } else { 391 int num_blks; 392 393 befs_ino->i_data.ds = 394 fsds_to_cpu(sb, &raw_inode->data.datastream); 395 396 num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds); 397 inode->i_blocks = 398 num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE); 399 inode->i_size = befs_ino->i_data.ds.size; 400 } 401 402 inode->i_mapping->a_ops = &befs_aops; 403 404 if (S_ISREG(inode->i_mode)) { 405 inode->i_fop = &generic_ro_fops; 406 } else if (S_ISDIR(inode->i_mode)) { 407 inode->i_op = &befs_dir_inode_operations; 408 inode->i_fop = &befs_dir_operations; 409 } else if (S_ISLNK(inode->i_mode)) { 410 inode->i_op = &befs_symlink_inode_operations; 411 } else { 412 befs_error(sb, "Inode %lu is not a regular file, " 413 "directory or symlink. THAT IS WRONG! BeFS has no " 414 "on disk special files", inode->i_ino); 415 goto unacquire_bh; 416 } 417 418 brelse(bh); 419 befs_debug(sb, "<--- befs_read_inode()"); 420 unlock_new_inode(inode); 421 return inode; 422 423 unacquire_bh: 424 brelse(bh); 425 426 unacquire_none: 427 iget_failed(inode); 428 befs_debug(sb, "<--- befs_read_inode() - Bad inode"); 429 return ERR_PTR(ret); 430 } 431 432 /* Initialize the inode cache. Called at fs setup. 433 * 434 * Taken from NFS implementation by Al Viro. 435 */ 436 static int 437 befs_init_inodecache(void) 438 { 439 befs_inode_cachep = kmem_cache_create("befs_inode_cache", 440 sizeof (struct befs_inode_info), 441 0, (SLAB_RECLAIM_ACCOUNT| 442 SLAB_MEM_SPREAD), 443 init_once); 444 if (befs_inode_cachep == NULL) { 445 printk(KERN_ERR "befs_init_inodecache: " 446 "Couldn't initialize inode slabcache\n"); 447 return -ENOMEM; 448 } 449 450 return 0; 451 } 452 453 /* Called at fs teardown. 454 * 455 * Taken from NFS implementation by Al Viro. 456 */ 457 static void 458 befs_destroy_inodecache(void) 459 { 460 /* 461 * Make sure all delayed rcu free inodes are flushed before we 462 * destroy cache. 463 */ 464 rcu_barrier(); 465 kmem_cache_destroy(befs_inode_cachep); 466 } 467 468 /* 469 * The inode of symbolic link is different to data stream. 470 * The data stream become link name. Unless the LONG_SYMLINK 471 * flag is set. 472 */ 473 static void * 474 befs_follow_link(struct dentry *dentry, struct nameidata *nd) 475 { 476 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); 477 char *link; 478 479 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { 480 struct super_block *sb = dentry->d_sb; 481 befs_data_stream *data = &befs_ino->i_data.ds; 482 befs_off_t len = data->size; 483 484 if (len == 0) { 485 befs_error(sb, "Long symlink with illegal length"); 486 link = ERR_PTR(-EIO); 487 } else { 488 befs_debug(sb, "Follow long symlink"); 489 490 link = kmalloc(len, GFP_NOFS); 491 if (!link) { 492 link = ERR_PTR(-ENOMEM); 493 } else if (befs_read_lsymlink(sb, data, link, len) != len) { 494 kfree(link); 495 befs_error(sb, "Failed to read entire long symlink"); 496 link = ERR_PTR(-EIO); 497 } else { 498 link[len - 1] = '\0'; 499 } 500 } 501 } else { 502 link = befs_ino->i_data.symlink; 503 } 504 505 nd_set_link(nd, link); 506 return NULL; 507 } 508 509 static void befs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 510 { 511 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); 512 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { 513 char *link = nd_get_link(nd); 514 if (!IS_ERR(link)) 515 kfree(link); 516 } 517 } 518 519 /* 520 * UTF-8 to NLS charset convert routine 521 * 522 * 523 * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than 524 * the nls tables directly 525 */ 526 527 static int 528 befs_utf2nls(struct super_block *sb, const char *in, 529 int in_len, char **out, int *out_len) 530 { 531 struct nls_table *nls = BEFS_SB(sb)->nls; 532 int i, o; 533 unicode_t uni; 534 int unilen, utflen; 535 char *result; 536 /* The utf8->nls conversion won't make the final nls string bigger 537 * than the utf one, but if the string is pure ascii they'll have the 538 * same width and an extra char is needed to save the additional \0 539 */ 540 int maxlen = in_len + 1; 541 542 befs_debug(sb, "---> utf2nls()"); 543 544 if (!nls) { 545 befs_error(sb, "befs_utf2nls called with no NLS table loaded"); 546 return -EINVAL; 547 } 548 549 *out = result = kmalloc(maxlen, GFP_NOFS); 550 if (!*out) { 551 befs_error(sb, "befs_utf2nls() cannot allocate memory"); 552 *out_len = 0; 553 return -ENOMEM; 554 } 555 556 for (i = o = 0; i < in_len; i += utflen, o += unilen) { 557 558 /* convert from UTF-8 to Unicode */ 559 utflen = utf8_to_utf32(&in[i], in_len - i, &uni); 560 if (utflen < 0) 561 goto conv_err; 562 563 /* convert from Unicode to nls */ 564 if (uni > MAX_WCHAR_T) 565 goto conv_err; 566 unilen = nls->uni2char(uni, &result[o], in_len - o); 567 if (unilen < 0) 568 goto conv_err; 569 } 570 result[o] = '\0'; 571 *out_len = o; 572 573 befs_debug(sb, "<--- utf2nls()"); 574 575 return o; 576 577 conv_err: 578 befs_error(sb, "Name using character set %s contains a character that " 579 "cannot be converted to unicode.", nls->charset); 580 befs_debug(sb, "<--- utf2nls()"); 581 kfree(result); 582 return -EILSEQ; 583 } 584 585 /** 586 * befs_nls2utf - Convert NLS string to utf8 encodeing 587 * @sb: Superblock 588 * @src: Input string buffer in NLS format 589 * @srclen: Length of input string in bytes 590 * @dest: The output string in UTF-8 format 591 * @destlen: Length of the output buffer 592 * 593 * Converts input string @src, which is in the format of the loaded NLS map, 594 * into a utf8 string. 595 * 596 * The destination string @dest is allocated by this function and the caller is 597 * responsible for freeing it with kfree() 598 * 599 * On return, *@destlen is the length of @dest in bytes. 600 * 601 * On success, the return value is the number of utf8 characters written to 602 * the output buffer @dest. 603 * 604 * On Failure, a negative number coresponding to the error code is returned. 605 */ 606 607 static int 608 befs_nls2utf(struct super_block *sb, const char *in, 609 int in_len, char **out, int *out_len) 610 { 611 struct nls_table *nls = BEFS_SB(sb)->nls; 612 int i, o; 613 wchar_t uni; 614 int unilen, utflen; 615 char *result; 616 /* There're nls characters that will translate to 3-chars-wide UTF-8 617 * characters, a additional byte is needed to save the final \0 618 * in special cases */ 619 int maxlen = (3 * in_len) + 1; 620 621 befs_debug(sb, "---> nls2utf()\n"); 622 623 if (!nls) { 624 befs_error(sb, "befs_nls2utf called with no NLS table loaded."); 625 return -EINVAL; 626 } 627 628 *out = result = kmalloc(maxlen, GFP_NOFS); 629 if (!*out) { 630 befs_error(sb, "befs_nls2utf() cannot allocate memory"); 631 *out_len = 0; 632 return -ENOMEM; 633 } 634 635 for (i = o = 0; i < in_len; i += unilen, o += utflen) { 636 637 /* convert from nls to unicode */ 638 unilen = nls->char2uni(&in[i], in_len - i, &uni); 639 if (unilen < 0) 640 goto conv_err; 641 642 /* convert from unicode to UTF-8 */ 643 utflen = utf32_to_utf8(uni, &result[o], 3); 644 if (utflen <= 0) 645 goto conv_err; 646 } 647 648 result[o] = '\0'; 649 *out_len = o; 650 651 befs_debug(sb, "<--- nls2utf()"); 652 653 return i; 654 655 conv_err: 656 befs_error(sb, "Name using charecter set %s contains a charecter that " 657 "cannot be converted to unicode.", nls->charset); 658 befs_debug(sb, "<--- nls2utf()"); 659 kfree(result); 660 return -EILSEQ; 661 } 662 663 /** 664 * Use the 665 * 666 */ 667 enum { 668 Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err, 669 }; 670 671 static const match_table_t befs_tokens = { 672 {Opt_uid, "uid=%d"}, 673 {Opt_gid, "gid=%d"}, 674 {Opt_charset, "iocharset=%s"}, 675 {Opt_debug, "debug"}, 676 {Opt_err, NULL} 677 }; 678 679 static int 680 parse_options(char *options, befs_mount_options * opts) 681 { 682 char *p; 683 substring_t args[MAX_OPT_ARGS]; 684 int option; 685 kuid_t uid; 686 kgid_t gid; 687 688 /* Initialize options */ 689 opts->uid = GLOBAL_ROOT_UID; 690 opts->gid = GLOBAL_ROOT_GID; 691 opts->use_uid = 0; 692 opts->use_gid = 0; 693 opts->iocharset = NULL; 694 opts->debug = 0; 695 696 if (!options) 697 return 1; 698 699 while ((p = strsep(&options, ",")) != NULL) { 700 int token; 701 if (!*p) 702 continue; 703 704 token = match_token(p, befs_tokens, args); 705 switch (token) { 706 case Opt_uid: 707 if (match_int(&args[0], &option)) 708 return 0; 709 uid = INVALID_UID; 710 if (option >= 0) 711 uid = make_kuid(current_user_ns(), option); 712 if (!uid_valid(uid)) { 713 printk(KERN_ERR "BeFS: Invalid uid %d, " 714 "using default\n", option); 715 break; 716 } 717 opts->uid = uid; 718 opts->use_uid = 1; 719 break; 720 case Opt_gid: 721 if (match_int(&args[0], &option)) 722 return 0; 723 gid = INVALID_GID; 724 if (option >= 0) 725 gid = make_kgid(current_user_ns(), option); 726 if (!gid_valid(gid)) { 727 printk(KERN_ERR "BeFS: Invalid gid %d, " 728 "using default\n", option); 729 break; 730 } 731 opts->gid = gid; 732 opts->use_gid = 1; 733 break; 734 case Opt_charset: 735 kfree(opts->iocharset); 736 opts->iocharset = match_strdup(&args[0]); 737 if (!opts->iocharset) { 738 printk(KERN_ERR "BeFS: allocation failure for " 739 "iocharset string\n"); 740 return 0; 741 } 742 break; 743 case Opt_debug: 744 opts->debug = 1; 745 break; 746 default: 747 printk(KERN_ERR "BeFS: Unrecognized mount option \"%s\" " 748 "or missing value\n", p); 749 return 0; 750 } 751 } 752 return 1; 753 } 754 755 /* This function has the responsibiltiy of getting the 756 * filesystem ready for unmounting. 757 * Basically, we free everything that we allocated in 758 * befs_read_inode 759 */ 760 static void 761 befs_put_super(struct super_block *sb) 762 { 763 kfree(BEFS_SB(sb)->mount_opts.iocharset); 764 BEFS_SB(sb)->mount_opts.iocharset = NULL; 765 unload_nls(BEFS_SB(sb)->nls); 766 kfree(sb->s_fs_info); 767 sb->s_fs_info = NULL; 768 } 769 770 /* Allocate private field of the superblock, fill it. 771 * 772 * Finish filling the public superblock fields 773 * Make the root directory 774 * Load a set of NLS translations if needed. 775 */ 776 static int 777 befs_fill_super(struct super_block *sb, void *data, int silent) 778 { 779 struct buffer_head *bh; 780 befs_sb_info *befs_sb; 781 befs_super_block *disk_sb; 782 struct inode *root; 783 long ret = -EINVAL; 784 const unsigned long sb_block = 0; 785 const off_t x86_sb_off = 512; 786 787 save_mount_options(sb, data); 788 789 sb->s_fs_info = kmalloc(sizeof (*befs_sb), GFP_KERNEL); 790 if (sb->s_fs_info == NULL) { 791 printk(KERN_ERR 792 "BeFS(%s): Unable to allocate memory for private " 793 "portion of superblock. Bailing.\n", sb->s_id); 794 goto unacquire_none; 795 } 796 befs_sb = BEFS_SB(sb); 797 memset(befs_sb, 0, sizeof(befs_sb_info)); 798 799 if (!parse_options((char *) data, &befs_sb->mount_opts)) { 800 befs_error(sb, "cannot parse mount options"); 801 goto unacquire_priv_sbp; 802 } 803 804 befs_debug(sb, "---> befs_fill_super()"); 805 806 #ifndef CONFIG_BEFS_RW 807 if (!(sb->s_flags & MS_RDONLY)) { 808 befs_warning(sb, 809 "No write support. Marking filesystem read-only"); 810 sb->s_flags |= MS_RDONLY; 811 } 812 #endif /* CONFIG_BEFS_RW */ 813 814 /* 815 * Set dummy blocksize to read super block. 816 * Will be set to real fs blocksize later. 817 * 818 * Linux 2.4.10 and later refuse to read blocks smaller than 819 * the hardsect size for the device. But we also need to read at 820 * least 1k to get the second 512 bytes of the volume. 821 * -WD 10-26-01 822 */ 823 sb_min_blocksize(sb, 1024); 824 825 if (!(bh = sb_bread(sb, sb_block))) { 826 befs_error(sb, "unable to read superblock"); 827 goto unacquire_priv_sbp; 828 } 829 830 /* account for offset of super block on x86 */ 831 disk_sb = (befs_super_block *) bh->b_data; 832 if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) || 833 (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) { 834 befs_debug(sb, "Using PPC superblock location"); 835 } else { 836 befs_debug(sb, "Using x86 superblock location"); 837 disk_sb = 838 (befs_super_block *) ((void *) bh->b_data + x86_sb_off); 839 } 840 841 if (befs_load_sb(sb, disk_sb) != BEFS_OK) 842 goto unacquire_bh; 843 844 befs_dump_super_block(sb, disk_sb); 845 846 brelse(bh); 847 848 if (befs_check_sb(sb) != BEFS_OK) 849 goto unacquire_priv_sbp; 850 851 if( befs_sb->num_blocks > ~((sector_t)0) ) { 852 befs_error(sb, "blocks count: %Lu " 853 "is larger than the host can use", 854 befs_sb->num_blocks); 855 goto unacquire_priv_sbp; 856 } 857 858 /* 859 * set up enough so that it can read an inode 860 * Fill in kernel superblock fields from private sb 861 */ 862 sb->s_magic = BEFS_SUPER_MAGIC; 863 /* Set real blocksize of fs */ 864 sb_set_blocksize(sb, (ulong) befs_sb->block_size); 865 sb->s_op = &befs_sops; 866 root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir))); 867 if (IS_ERR(root)) { 868 ret = PTR_ERR(root); 869 goto unacquire_priv_sbp; 870 } 871 sb->s_root = d_make_root(root); 872 if (!sb->s_root) { 873 befs_error(sb, "get root inode failed"); 874 goto unacquire_priv_sbp; 875 } 876 877 /* load nls library */ 878 if (befs_sb->mount_opts.iocharset) { 879 befs_debug(sb, "Loading nls: %s", 880 befs_sb->mount_opts.iocharset); 881 befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset); 882 if (!befs_sb->nls) { 883 befs_warning(sb, "Cannot load nls %s" 884 " loading default nls", 885 befs_sb->mount_opts.iocharset); 886 befs_sb->nls = load_nls_default(); 887 } 888 /* load default nls if none is specified in mount options */ 889 } else { 890 befs_debug(sb, "Loading default nls"); 891 befs_sb->nls = load_nls_default(); 892 } 893 894 return 0; 895 /*****************/ 896 unacquire_bh: 897 brelse(bh); 898 899 unacquire_priv_sbp: 900 kfree(befs_sb->mount_opts.iocharset); 901 kfree(sb->s_fs_info); 902 903 unacquire_none: 904 sb->s_fs_info = NULL; 905 return ret; 906 } 907 908 static int 909 befs_remount(struct super_block *sb, int *flags, char *data) 910 { 911 if (!(*flags & MS_RDONLY)) 912 return -EINVAL; 913 return 0; 914 } 915 916 static int 917 befs_statfs(struct dentry *dentry, struct kstatfs *buf) 918 { 919 struct super_block *sb = dentry->d_sb; 920 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 921 922 befs_debug(sb, "---> befs_statfs()"); 923 924 buf->f_type = BEFS_SUPER_MAGIC; 925 buf->f_bsize = sb->s_blocksize; 926 buf->f_blocks = BEFS_SB(sb)->num_blocks; 927 buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks; 928 buf->f_bavail = buf->f_bfree; 929 buf->f_files = 0; /* UNKNOWN */ 930 buf->f_ffree = 0; /* UNKNOWN */ 931 buf->f_fsid.val[0] = (u32)id; 932 buf->f_fsid.val[1] = (u32)(id >> 32); 933 buf->f_namelen = BEFS_NAME_LEN; 934 935 befs_debug(sb, "<--- befs_statfs()"); 936 937 return 0; 938 } 939 940 static struct dentry * 941 befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, 942 void *data) 943 { 944 return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super); 945 } 946 947 static struct file_system_type befs_fs_type = { 948 .owner = THIS_MODULE, 949 .name = "befs", 950 .mount = befs_mount, 951 .kill_sb = kill_block_super, 952 .fs_flags = FS_REQUIRES_DEV, 953 }; 954 MODULE_ALIAS_FS("befs"); 955 956 static int __init 957 init_befs_fs(void) 958 { 959 int err; 960 961 printk(KERN_INFO "BeFS version: %s\n", BEFS_VERSION); 962 963 err = befs_init_inodecache(); 964 if (err) 965 goto unacquire_none; 966 967 err = register_filesystem(&befs_fs_type); 968 if (err) 969 goto unacquire_inodecache; 970 971 return 0; 972 973 unacquire_inodecache: 974 befs_destroy_inodecache(); 975 976 unacquire_none: 977 return err; 978 } 979 980 static void __exit 981 exit_befs_fs(void) 982 { 983 befs_destroy_inodecache(); 984 985 unregister_filesystem(&befs_fs_type); 986 } 987 988 /* 989 Macros that typecheck the init and exit functions, 990 ensures that they are called at init and cleanup, 991 and eliminates warnings about unused functions. 992 */ 993 module_init(init_befs_fs) 994 module_exit(exit_befs_fs) 995