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 288 befs_destroy_inode(struct inode *inode) 289 { 290 kmem_cache_free(befs_inode_cachep, BEFS_I(inode)); 291 } 292 293 static void init_once(void *foo) 294 { 295 struct befs_inode_info *bi = (struct befs_inode_info *) foo; 296 297 inode_init_once(&bi->vfs_inode); 298 } 299 300 static struct inode *befs_iget(struct super_block *sb, unsigned long ino) 301 { 302 struct buffer_head *bh = NULL; 303 befs_inode *raw_inode = NULL; 304 305 befs_sb_info *befs_sb = BEFS_SB(sb); 306 befs_inode_info *befs_ino = NULL; 307 struct inode *inode; 308 long ret = -EIO; 309 310 befs_debug(sb, "---> befs_read_inode() " "inode = %lu", ino); 311 312 inode = iget_locked(sb, ino); 313 if (IS_ERR(inode)) 314 return inode; 315 if (!(inode->i_state & I_NEW)) 316 return inode; 317 318 befs_ino = BEFS_I(inode); 319 320 /* convert from vfs's inode number to befs's inode number */ 321 befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino); 322 323 befs_debug(sb, " real inode number [%u, %hu, %hu]", 324 befs_ino->i_inode_num.allocation_group, 325 befs_ino->i_inode_num.start, befs_ino->i_inode_num.len); 326 327 bh = befs_bread(sb, inode->i_ino); 328 if (!bh) { 329 befs_error(sb, "unable to read inode block - " 330 "inode = %lu", inode->i_ino); 331 goto unacquire_none; 332 } 333 334 raw_inode = (befs_inode *) bh->b_data; 335 336 befs_dump_inode(sb, raw_inode); 337 338 if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) { 339 befs_error(sb, "Bad inode: %lu", inode->i_ino); 340 goto unacquire_bh; 341 } 342 343 inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode); 344 345 /* 346 * set uid and gid. But since current BeOS is single user OS, so 347 * you can change by "uid" or "gid" options. 348 */ 349 350 inode->i_uid = befs_sb->mount_opts.use_uid ? 351 befs_sb->mount_opts.uid : (uid_t) fs32_to_cpu(sb, raw_inode->uid); 352 inode->i_gid = befs_sb->mount_opts.use_gid ? 353 befs_sb->mount_opts.gid : (gid_t) fs32_to_cpu(sb, raw_inode->gid); 354 355 inode->i_nlink = 1; 356 357 /* 358 * BEFS's time is 64 bits, but current VFS is 32 bits... 359 * BEFS don't have access time. Nor inode change time. VFS 360 * doesn't have creation time. 361 * Also, the lower 16 bits of the last_modified_time and 362 * create_time are just a counter to help ensure uniqueness 363 * for indexing purposes. (PFD, page 54) 364 */ 365 366 inode->i_mtime.tv_sec = 367 fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16; 368 inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */ 369 inode->i_ctime = inode->i_mtime; 370 inode->i_atime = inode->i_mtime; 371 372 befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num); 373 befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent); 374 befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes); 375 befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags); 376 377 if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){ 378 inode->i_size = 0; 379 inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE; 380 strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink, 381 BEFS_SYMLINK_LEN); 382 } else { 383 int num_blks; 384 385 befs_ino->i_data.ds = 386 fsds_to_cpu(sb, raw_inode->data.datastream); 387 388 num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds); 389 inode->i_blocks = 390 num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE); 391 inode->i_size = befs_ino->i_data.ds.size; 392 } 393 394 inode->i_mapping->a_ops = &befs_aops; 395 396 if (S_ISREG(inode->i_mode)) { 397 inode->i_fop = &generic_ro_fops; 398 } else if (S_ISDIR(inode->i_mode)) { 399 inode->i_op = &befs_dir_inode_operations; 400 inode->i_fop = &befs_dir_operations; 401 } else if (S_ISLNK(inode->i_mode)) { 402 inode->i_op = &befs_symlink_inode_operations; 403 } else { 404 befs_error(sb, "Inode %lu is not a regular file, " 405 "directory or symlink. THAT IS WRONG! BeFS has no " 406 "on disk special files", inode->i_ino); 407 goto unacquire_bh; 408 } 409 410 brelse(bh); 411 befs_debug(sb, "<--- befs_read_inode()"); 412 unlock_new_inode(inode); 413 return inode; 414 415 unacquire_bh: 416 brelse(bh); 417 418 unacquire_none: 419 iget_failed(inode); 420 befs_debug(sb, "<--- befs_read_inode() - Bad inode"); 421 return ERR_PTR(ret); 422 } 423 424 /* Initialize the inode cache. Called at fs setup. 425 * 426 * Taken from NFS implementation by Al Viro. 427 */ 428 static int 429 befs_init_inodecache(void) 430 { 431 befs_inode_cachep = kmem_cache_create("befs_inode_cache", 432 sizeof (struct befs_inode_info), 433 0, (SLAB_RECLAIM_ACCOUNT| 434 SLAB_MEM_SPREAD), 435 init_once); 436 if (befs_inode_cachep == NULL) { 437 printk(KERN_ERR "befs_init_inodecache: " 438 "Couldn't initalize inode slabcache\n"); 439 return -ENOMEM; 440 } 441 442 return 0; 443 } 444 445 /* Called at fs teardown. 446 * 447 * Taken from NFS implementation by Al Viro. 448 */ 449 static void 450 befs_destroy_inodecache(void) 451 { 452 kmem_cache_destroy(befs_inode_cachep); 453 } 454 455 /* 456 * The inode of symbolic link is different to data stream. 457 * The data stream become link name. Unless the LONG_SYMLINK 458 * flag is set. 459 */ 460 static void * 461 befs_follow_link(struct dentry *dentry, struct nameidata *nd) 462 { 463 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); 464 char *link; 465 466 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { 467 struct super_block *sb = dentry->d_sb; 468 befs_data_stream *data = &befs_ino->i_data.ds; 469 befs_off_t len = data->size; 470 471 befs_debug(sb, "Follow long symlink"); 472 473 link = kmalloc(len, GFP_NOFS); 474 if (!link) { 475 link = ERR_PTR(-ENOMEM); 476 } else if (befs_read_lsymlink(sb, data, link, len) != len) { 477 kfree(link); 478 befs_error(sb, "Failed to read entire long symlink"); 479 link = ERR_PTR(-EIO); 480 } 481 } else { 482 link = befs_ino->i_data.symlink; 483 } 484 485 nd_set_link(nd, link); 486 return NULL; 487 } 488 489 static void befs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 490 { 491 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); 492 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { 493 char *link = nd_get_link(nd); 494 if (!IS_ERR(link)) 495 kfree(link); 496 } 497 } 498 499 /* 500 * UTF-8 to NLS charset convert routine 501 * 502 * 503 * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than 504 * the nls tables directly 505 */ 506 507 static int 508 befs_utf2nls(struct super_block *sb, const char *in, 509 int in_len, char **out, int *out_len) 510 { 511 struct nls_table *nls = BEFS_SB(sb)->nls; 512 int i, o; 513 wchar_t uni; 514 int unilen, utflen; 515 char *result; 516 /* The utf8->nls conversion won't make the final nls string bigger 517 * than the utf one, but if the string is pure ascii they'll have the 518 * same width and an extra char is needed to save the additional \0 519 */ 520 int maxlen = in_len + 1; 521 522 befs_debug(sb, "---> utf2nls()"); 523 524 if (!nls) { 525 befs_error(sb, "befs_utf2nls called with no NLS table loaded"); 526 return -EINVAL; 527 } 528 529 *out = result = kmalloc(maxlen, GFP_NOFS); 530 if (!*out) { 531 befs_error(sb, "befs_utf2nls() cannot allocate memory"); 532 *out_len = 0; 533 return -ENOMEM; 534 } 535 536 for (i = o = 0; i < in_len; i += utflen, o += unilen) { 537 538 /* convert from UTF-8 to Unicode */ 539 utflen = utf8_mbtowc(&uni, &in[i], in_len - i); 540 if (utflen < 0) { 541 goto conv_err; 542 } 543 544 /* convert from Unicode to nls */ 545 unilen = nls->uni2char(uni, &result[o], in_len - o); 546 if (unilen < 0) { 547 goto conv_err; 548 } 549 } 550 result[o] = '\0'; 551 *out_len = o; 552 553 befs_debug(sb, "<--- utf2nls()"); 554 555 return o; 556 557 conv_err: 558 befs_error(sb, "Name using character set %s contains a character that " 559 "cannot be converted to unicode.", nls->charset); 560 befs_debug(sb, "<--- utf2nls()"); 561 kfree(result); 562 return -EILSEQ; 563 } 564 565 /** 566 * befs_nls2utf - Convert NLS string to utf8 encodeing 567 * @sb: Superblock 568 * @src: Input string buffer in NLS format 569 * @srclen: Length of input string in bytes 570 * @dest: The output string in UTF-8 format 571 * @destlen: Length of the output buffer 572 * 573 * Converts input string @src, which is in the format of the loaded NLS map, 574 * into a utf8 string. 575 * 576 * The destination string @dest is allocated by this function and the caller is 577 * responsible for freeing it with kfree() 578 * 579 * On return, *@destlen is the length of @dest in bytes. 580 * 581 * On success, the return value is the number of utf8 characters written to 582 * the output buffer @dest. 583 * 584 * On Failure, a negative number coresponding to the error code is returned. 585 */ 586 587 static int 588 befs_nls2utf(struct super_block *sb, const char *in, 589 int in_len, char **out, int *out_len) 590 { 591 struct nls_table *nls = BEFS_SB(sb)->nls; 592 int i, o; 593 wchar_t uni; 594 int unilen, utflen; 595 char *result; 596 /* There're nls characters that will translate to 3-chars-wide UTF-8 597 * characters, a additional byte is needed to save the final \0 598 * in special cases */ 599 int maxlen = (3 * in_len) + 1; 600 601 befs_debug(sb, "---> nls2utf()\n"); 602 603 if (!nls) { 604 befs_error(sb, "befs_nls2utf called with no NLS table loaded."); 605 return -EINVAL; 606 } 607 608 *out = result = kmalloc(maxlen, GFP_NOFS); 609 if (!*out) { 610 befs_error(sb, "befs_nls2utf() cannot allocate memory"); 611 *out_len = 0; 612 return -ENOMEM; 613 } 614 615 for (i = o = 0; i < in_len; i += unilen, o += utflen) { 616 617 /* convert from nls to unicode */ 618 unilen = nls->char2uni(&in[i], in_len - i, &uni); 619 if (unilen < 0) { 620 goto conv_err; 621 } 622 623 /* convert from unicode to UTF-8 */ 624 utflen = utf8_wctomb(&result[o], uni, 3); 625 if (utflen <= 0) { 626 goto conv_err; 627 } 628 } 629 630 result[o] = '\0'; 631 *out_len = o; 632 633 befs_debug(sb, "<--- nls2utf()"); 634 635 return i; 636 637 conv_err: 638 befs_error(sb, "Name using charecter set %s contains a charecter that " 639 "cannot be converted to unicode.", nls->charset); 640 befs_debug(sb, "<--- nls2utf()"); 641 kfree(result); 642 return -EILSEQ; 643 } 644 645 /** 646 * Use the 647 * 648 */ 649 enum { 650 Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err, 651 }; 652 653 static const match_table_t befs_tokens = { 654 {Opt_uid, "uid=%d"}, 655 {Opt_gid, "gid=%d"}, 656 {Opt_charset, "iocharset=%s"}, 657 {Opt_debug, "debug"}, 658 {Opt_err, NULL} 659 }; 660 661 static int 662 parse_options(char *options, befs_mount_options * opts) 663 { 664 char *p; 665 substring_t args[MAX_OPT_ARGS]; 666 int option; 667 668 /* Initialize options */ 669 opts->uid = 0; 670 opts->gid = 0; 671 opts->use_uid = 0; 672 opts->use_gid = 0; 673 opts->iocharset = NULL; 674 opts->debug = 0; 675 676 if (!options) 677 return 1; 678 679 while ((p = strsep(&options, ",")) != NULL) { 680 int token; 681 if (!*p) 682 continue; 683 684 token = match_token(p, befs_tokens, args); 685 switch (token) { 686 case Opt_uid: 687 if (match_int(&args[0], &option)) 688 return 0; 689 if (option < 0) { 690 printk(KERN_ERR "BeFS: Invalid uid %d, " 691 "using default\n", option); 692 break; 693 } 694 opts->uid = option; 695 opts->use_uid = 1; 696 break; 697 case Opt_gid: 698 if (match_int(&args[0], &option)) 699 return 0; 700 if (option < 0) { 701 printk(KERN_ERR "BeFS: Invalid gid %d, " 702 "using default\n", option); 703 break; 704 } 705 opts->gid = option; 706 opts->use_gid = 1; 707 break; 708 case Opt_charset: 709 kfree(opts->iocharset); 710 opts->iocharset = match_strdup(&args[0]); 711 if (!opts->iocharset) { 712 printk(KERN_ERR "BeFS: allocation failure for " 713 "iocharset string\n"); 714 return 0; 715 } 716 break; 717 case Opt_debug: 718 opts->debug = 1; 719 break; 720 default: 721 printk(KERN_ERR "BeFS: Unrecognized mount option \"%s\" " 722 "or missing value\n", p); 723 return 0; 724 } 725 } 726 return 1; 727 } 728 729 /* This function has the responsibiltiy of getting the 730 * filesystem ready for unmounting. 731 * Basicly, we free everything that we allocated in 732 * befs_read_inode 733 */ 734 static void 735 befs_put_super(struct super_block *sb) 736 { 737 kfree(BEFS_SB(sb)->mount_opts.iocharset); 738 BEFS_SB(sb)->mount_opts.iocharset = NULL; 739 740 if (BEFS_SB(sb)->nls) { 741 unload_nls(BEFS_SB(sb)->nls); 742 BEFS_SB(sb)->nls = NULL; 743 } 744 745 kfree(sb->s_fs_info); 746 sb->s_fs_info = NULL; 747 return; 748 } 749 750 /* Allocate private field of the superblock, fill it. 751 * 752 * Finish filling the public superblock fields 753 * Make the root directory 754 * Load a set of NLS translations if needed. 755 */ 756 static int 757 befs_fill_super(struct super_block *sb, void *data, int silent) 758 { 759 struct buffer_head *bh; 760 befs_sb_info *befs_sb; 761 befs_super_block *disk_sb; 762 struct inode *root; 763 long ret = -EINVAL; 764 const unsigned long sb_block = 0; 765 const off_t x86_sb_off = 512; 766 767 save_mount_options(sb, data); 768 769 sb->s_fs_info = kmalloc(sizeof (*befs_sb), GFP_KERNEL); 770 if (sb->s_fs_info == NULL) { 771 printk(KERN_ERR 772 "BeFS(%s): Unable to allocate memory for private " 773 "portion of superblock. Bailing.\n", sb->s_id); 774 goto unacquire_none; 775 } 776 befs_sb = BEFS_SB(sb); 777 memset(befs_sb, 0, sizeof(befs_sb_info)); 778 779 if (!parse_options((char *) data, &befs_sb->mount_opts)) { 780 befs_error(sb, "cannot parse mount options"); 781 goto unacquire_priv_sbp; 782 } 783 784 befs_debug(sb, "---> befs_fill_super()"); 785 786 #ifndef CONFIG_BEFS_RW 787 if (!(sb->s_flags & MS_RDONLY)) { 788 befs_warning(sb, 789 "No write support. Marking filesystem read-only"); 790 sb->s_flags |= MS_RDONLY; 791 } 792 #endif /* CONFIG_BEFS_RW */ 793 794 /* 795 * Set dummy blocksize to read super block. 796 * Will be set to real fs blocksize later. 797 * 798 * Linux 2.4.10 and later refuse to read blocks smaller than 799 * the hardsect size for the device. But we also need to read at 800 * least 1k to get the second 512 bytes of the volume. 801 * -WD 10-26-01 802 */ 803 sb_min_blocksize(sb, 1024); 804 805 if (!(bh = sb_bread(sb, sb_block))) { 806 befs_error(sb, "unable to read superblock"); 807 goto unacquire_priv_sbp; 808 } 809 810 /* account for offset of super block on x86 */ 811 disk_sb = (befs_super_block *) bh->b_data; 812 if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) || 813 (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) { 814 befs_debug(sb, "Using PPC superblock location"); 815 } else { 816 befs_debug(sb, "Using x86 superblock location"); 817 disk_sb = 818 (befs_super_block *) ((void *) bh->b_data + x86_sb_off); 819 } 820 821 if (befs_load_sb(sb, disk_sb) != BEFS_OK) 822 goto unacquire_bh; 823 824 befs_dump_super_block(sb, disk_sb); 825 826 brelse(bh); 827 828 if (befs_check_sb(sb) != BEFS_OK) 829 goto unacquire_priv_sbp; 830 831 if( befs_sb->num_blocks > ~((sector_t)0) ) { 832 befs_error(sb, "blocks count: %Lu " 833 "is larger than the host can use", 834 befs_sb->num_blocks); 835 goto unacquire_priv_sbp; 836 } 837 838 /* 839 * set up enough so that it can read an inode 840 * Fill in kernel superblock fields from private sb 841 */ 842 sb->s_magic = BEFS_SUPER_MAGIC; 843 /* Set real blocksize of fs */ 844 sb_set_blocksize(sb, (ulong) befs_sb->block_size); 845 sb->s_op = (struct super_operations *) &befs_sops; 846 root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir))); 847 if (IS_ERR(root)) { 848 ret = PTR_ERR(root); 849 goto unacquire_priv_sbp; 850 } 851 sb->s_root = d_alloc_root(root); 852 if (!sb->s_root) { 853 iput(root); 854 befs_error(sb, "get root inode failed"); 855 goto unacquire_priv_sbp; 856 } 857 858 /* load nls library */ 859 if (befs_sb->mount_opts.iocharset) { 860 befs_debug(sb, "Loading nls: %s", 861 befs_sb->mount_opts.iocharset); 862 befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset); 863 if (!befs_sb->nls) { 864 befs_warning(sb, "Cannot load nls %s" 865 " loading default nls", 866 befs_sb->mount_opts.iocharset); 867 befs_sb->nls = load_nls_default(); 868 } 869 /* load default nls if none is specified in mount options */ 870 } else { 871 befs_debug(sb, "Loading default nls"); 872 befs_sb->nls = load_nls_default(); 873 } 874 875 return 0; 876 /*****************/ 877 unacquire_bh: 878 brelse(bh); 879 880 unacquire_priv_sbp: 881 kfree(sb->s_fs_info); 882 883 unacquire_none: 884 sb->s_fs_info = NULL; 885 return ret; 886 } 887 888 static int 889 befs_remount(struct super_block *sb, int *flags, char *data) 890 { 891 if (!(*flags & MS_RDONLY)) 892 return -EINVAL; 893 return 0; 894 } 895 896 static int 897 befs_statfs(struct dentry *dentry, struct kstatfs *buf) 898 { 899 struct super_block *sb = dentry->d_sb; 900 901 befs_debug(sb, "---> befs_statfs()"); 902 903 buf->f_type = BEFS_SUPER_MAGIC; 904 buf->f_bsize = sb->s_blocksize; 905 buf->f_blocks = BEFS_SB(sb)->num_blocks; 906 buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks; 907 buf->f_bavail = buf->f_bfree; 908 buf->f_files = 0; /* UNKNOWN */ 909 buf->f_ffree = 0; /* UNKNOWN */ 910 buf->f_namelen = BEFS_NAME_LEN; 911 912 befs_debug(sb, "<--- befs_statfs()"); 913 914 return 0; 915 } 916 917 static int 918 befs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, 919 void *data, struct vfsmount *mnt) 920 { 921 return get_sb_bdev(fs_type, flags, dev_name, data, befs_fill_super, 922 mnt); 923 } 924 925 static struct file_system_type befs_fs_type = { 926 .owner = THIS_MODULE, 927 .name = "befs", 928 .get_sb = befs_get_sb, 929 .kill_sb = kill_block_super, 930 .fs_flags = FS_REQUIRES_DEV, 931 }; 932 933 static int __init 934 init_befs_fs(void) 935 { 936 int err; 937 938 printk(KERN_INFO "BeFS version: %s\n", BEFS_VERSION); 939 940 err = befs_init_inodecache(); 941 if (err) 942 goto unacquire_none; 943 944 err = register_filesystem(&befs_fs_type); 945 if (err) 946 goto unacquire_inodecache; 947 948 return 0; 949 950 unacquire_inodecache: 951 befs_destroy_inodecache(); 952 953 unacquire_none: 954 return err; 955 } 956 957 static void __exit 958 exit_befs_fs(void) 959 { 960 befs_destroy_inodecache(); 961 962 unregister_filesystem(&befs_fs_type); 963 } 964 965 /* 966 Macros that typecheck the init and exit functions, 967 ensures that they are called at init and cleanup, 968 and eliminates warnings about unused functions. 969 */ 970 module_init(init_befs_fs) 971 module_exit(exit_befs_fs) 972