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 }; 70 71 static const struct inode_operations befs_dir_inode_operations = { 72 .lookup = befs_lookup, 73 }; 74 75 static const struct address_space_operations befs_aops = { 76 .readpage = befs_readpage, 77 .sync_page = block_sync_page, 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, struct nameidata *nd) 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 287 befs_destroy_inode(struct inode *inode) 288 { 289 kmem_cache_free(befs_inode_cachep, BEFS_I(inode)); 290 } 291 292 static void init_once(void *foo) 293 { 294 struct befs_inode_info *bi = (struct befs_inode_info *) foo; 295 296 inode_init_once(&bi->vfs_inode); 297 } 298 299 static struct inode *befs_iget(struct super_block *sb, unsigned long ino) 300 { 301 struct buffer_head *bh = NULL; 302 befs_inode *raw_inode = NULL; 303 304 befs_sb_info *befs_sb = BEFS_SB(sb); 305 befs_inode_info *befs_ino = NULL; 306 struct inode *inode; 307 long ret = -EIO; 308 309 befs_debug(sb, "---> befs_read_inode() " "inode = %lu", ino); 310 311 inode = iget_locked(sb, ino); 312 if (IS_ERR(inode)) 313 return inode; 314 if (!(inode->i_state & I_NEW)) 315 return inode; 316 317 befs_ino = BEFS_I(inode); 318 319 /* convert from vfs's inode number to befs's inode number */ 320 befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino); 321 322 befs_debug(sb, " real inode number [%u, %hu, %hu]", 323 befs_ino->i_inode_num.allocation_group, 324 befs_ino->i_inode_num.start, befs_ino->i_inode_num.len); 325 326 bh = befs_bread(sb, inode->i_ino); 327 if (!bh) { 328 befs_error(sb, "unable to read inode block - " 329 "inode = %lu", inode->i_ino); 330 goto unacquire_none; 331 } 332 333 raw_inode = (befs_inode *) bh->b_data; 334 335 befs_dump_inode(sb, raw_inode); 336 337 if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) { 338 befs_error(sb, "Bad inode: %lu", inode->i_ino); 339 goto unacquire_bh; 340 } 341 342 inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode); 343 344 /* 345 * set uid and gid. But since current BeOS is single user OS, so 346 * you can change by "uid" or "gid" options. 347 */ 348 349 inode->i_uid = befs_sb->mount_opts.use_uid ? 350 befs_sb->mount_opts.uid : (uid_t) fs32_to_cpu(sb, raw_inode->uid); 351 inode->i_gid = befs_sb->mount_opts.use_gid ? 352 befs_sb->mount_opts.gid : (gid_t) fs32_to_cpu(sb, raw_inode->gid); 353 354 inode->i_nlink = 1; 355 356 /* 357 * BEFS's time is 64 bits, but current VFS is 32 bits... 358 * BEFS don't have access time. Nor inode change time. VFS 359 * doesn't have creation time. 360 * Also, the lower 16 bits of the last_modified_time and 361 * create_time are just a counter to help ensure uniqueness 362 * for indexing purposes. (PFD, page 54) 363 */ 364 365 inode->i_mtime.tv_sec = 366 fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16; 367 inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */ 368 inode->i_ctime = inode->i_mtime; 369 inode->i_atime = inode->i_mtime; 370 371 befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num); 372 befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent); 373 befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes); 374 befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags); 375 376 if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){ 377 inode->i_size = 0; 378 inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE; 379 strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink, 380 BEFS_SYMLINK_LEN); 381 } else { 382 int num_blks; 383 384 befs_ino->i_data.ds = 385 fsds_to_cpu(sb, raw_inode->data.datastream); 386 387 num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds); 388 inode->i_blocks = 389 num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE); 390 inode->i_size = befs_ino->i_data.ds.size; 391 } 392 393 inode->i_mapping->a_ops = &befs_aops; 394 395 if (S_ISREG(inode->i_mode)) { 396 inode->i_fop = &generic_ro_fops; 397 } else if (S_ISDIR(inode->i_mode)) { 398 inode->i_op = &befs_dir_inode_operations; 399 inode->i_fop = &befs_dir_operations; 400 } else if (S_ISLNK(inode->i_mode)) { 401 inode->i_op = &befs_symlink_inode_operations; 402 } else { 403 befs_error(sb, "Inode %lu is not a regular file, " 404 "directory or symlink. THAT IS WRONG! BeFS has no " 405 "on disk special files", inode->i_ino); 406 goto unacquire_bh; 407 } 408 409 brelse(bh); 410 befs_debug(sb, "<--- befs_read_inode()"); 411 unlock_new_inode(inode); 412 return inode; 413 414 unacquire_bh: 415 brelse(bh); 416 417 unacquire_none: 418 iget_failed(inode); 419 befs_debug(sb, "<--- befs_read_inode() - Bad inode"); 420 return ERR_PTR(ret); 421 } 422 423 /* Initialize the inode cache. Called at fs setup. 424 * 425 * Taken from NFS implementation by Al Viro. 426 */ 427 static int 428 befs_init_inodecache(void) 429 { 430 befs_inode_cachep = kmem_cache_create("befs_inode_cache", 431 sizeof (struct befs_inode_info), 432 0, (SLAB_RECLAIM_ACCOUNT| 433 SLAB_MEM_SPREAD), 434 init_once); 435 if (befs_inode_cachep == NULL) { 436 printk(KERN_ERR "befs_init_inodecache: " 437 "Couldn't initalize inode slabcache\n"); 438 return -ENOMEM; 439 } 440 441 return 0; 442 } 443 444 /* Called at fs teardown. 445 * 446 * Taken from NFS implementation by Al Viro. 447 */ 448 static void 449 befs_destroy_inodecache(void) 450 { 451 kmem_cache_destroy(befs_inode_cachep); 452 } 453 454 /* 455 * The inode of symbolic link is different to data stream. 456 * The data stream become link name. Unless the LONG_SYMLINK 457 * flag is set. 458 */ 459 static void * 460 befs_follow_link(struct dentry *dentry, struct nameidata *nd) 461 { 462 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); 463 char *link; 464 465 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { 466 struct super_block *sb = dentry->d_sb; 467 befs_data_stream *data = &befs_ino->i_data.ds; 468 befs_off_t len = data->size; 469 470 befs_debug(sb, "Follow long symlink"); 471 472 link = kmalloc(len, GFP_NOFS); 473 if (!link) { 474 link = ERR_PTR(-ENOMEM); 475 } else if (befs_read_lsymlink(sb, data, link, len) != len) { 476 kfree(link); 477 befs_error(sb, "Failed to read entire long symlink"); 478 link = ERR_PTR(-EIO); 479 } 480 } else { 481 link = befs_ino->i_data.symlink; 482 } 483 484 nd_set_link(nd, link); 485 return NULL; 486 } 487 488 static void befs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 489 { 490 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); 491 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { 492 char *link = nd_get_link(nd); 493 if (!IS_ERR(link)) 494 kfree(link); 495 } 496 } 497 498 /* 499 * UTF-8 to NLS charset convert routine 500 * 501 * 502 * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than 503 * the nls tables directly 504 */ 505 506 static int 507 befs_utf2nls(struct super_block *sb, const char *in, 508 int in_len, char **out, int *out_len) 509 { 510 struct nls_table *nls = BEFS_SB(sb)->nls; 511 int i, o; 512 wchar_t uni; 513 int unilen, utflen; 514 char *result; 515 /* The utf8->nls conversion won't make the final nls string bigger 516 * than the utf one, but if the string is pure ascii they'll have the 517 * same width and an extra char is needed to save the additional \0 518 */ 519 int maxlen = in_len + 1; 520 521 befs_debug(sb, "---> utf2nls()"); 522 523 if (!nls) { 524 befs_error(sb, "befs_utf2nls called with no NLS table loaded"); 525 return -EINVAL; 526 } 527 528 *out = result = kmalloc(maxlen, GFP_NOFS); 529 if (!*out) { 530 befs_error(sb, "befs_utf2nls() cannot allocate memory"); 531 *out_len = 0; 532 return -ENOMEM; 533 } 534 535 for (i = o = 0; i < in_len; i += utflen, o += unilen) { 536 537 /* convert from UTF-8 to Unicode */ 538 utflen = utf8_mbtowc(&uni, &in[i], in_len - i); 539 if (utflen < 0) { 540 goto conv_err; 541 } 542 543 /* convert from Unicode to nls */ 544 unilen = nls->uni2char(uni, &result[o], in_len - o); 545 if (unilen < 0) { 546 goto conv_err; 547 } 548 } 549 result[o] = '\0'; 550 *out_len = o; 551 552 befs_debug(sb, "<--- utf2nls()"); 553 554 return o; 555 556 conv_err: 557 befs_error(sb, "Name using character set %s contains a character that " 558 "cannot be converted to unicode.", nls->charset); 559 befs_debug(sb, "<--- utf2nls()"); 560 kfree(result); 561 return -EILSEQ; 562 } 563 564 /** 565 * befs_nls2utf - Convert NLS string to utf8 encodeing 566 * @sb: Superblock 567 * @src: Input string buffer in NLS format 568 * @srclen: Length of input string in bytes 569 * @dest: The output string in UTF-8 format 570 * @destlen: Length of the output buffer 571 * 572 * Converts input string @src, which is in the format of the loaded NLS map, 573 * into a utf8 string. 574 * 575 * The destination string @dest is allocated by this function and the caller is 576 * responsible for freeing it with kfree() 577 * 578 * On return, *@destlen is the length of @dest in bytes. 579 * 580 * On success, the return value is the number of utf8 characters written to 581 * the output buffer @dest. 582 * 583 * On Failure, a negative number coresponding to the error code is returned. 584 */ 585 586 static int 587 befs_nls2utf(struct super_block *sb, const char *in, 588 int in_len, char **out, int *out_len) 589 { 590 struct nls_table *nls = BEFS_SB(sb)->nls; 591 int i, o; 592 wchar_t uni; 593 int unilen, utflen; 594 char *result; 595 /* There're nls characters that will translate to 3-chars-wide UTF-8 596 * characters, a additional byte is needed to save the final \0 597 * in special cases */ 598 int maxlen = (3 * in_len) + 1; 599 600 befs_debug(sb, "---> nls2utf()\n"); 601 602 if (!nls) { 603 befs_error(sb, "befs_nls2utf called with no NLS table loaded."); 604 return -EINVAL; 605 } 606 607 *out = result = kmalloc(maxlen, GFP_NOFS); 608 if (!*out) { 609 befs_error(sb, "befs_nls2utf() cannot allocate memory"); 610 *out_len = 0; 611 return -ENOMEM; 612 } 613 614 for (i = o = 0; i < in_len; i += unilen, o += utflen) { 615 616 /* convert from nls to unicode */ 617 unilen = nls->char2uni(&in[i], in_len - i, &uni); 618 if (unilen < 0) { 619 goto conv_err; 620 } 621 622 /* convert from unicode to UTF-8 */ 623 utflen = utf8_wctomb(&result[o], uni, 3); 624 if (utflen <= 0) { 625 goto conv_err; 626 } 627 } 628 629 result[o] = '\0'; 630 *out_len = o; 631 632 befs_debug(sb, "<--- nls2utf()"); 633 634 return i; 635 636 conv_err: 637 befs_error(sb, "Name using charecter set %s contains a charecter that " 638 "cannot be converted to unicode.", nls->charset); 639 befs_debug(sb, "<--- nls2utf()"); 640 kfree(result); 641 return -EILSEQ; 642 } 643 644 /** 645 * Use the 646 * 647 */ 648 enum { 649 Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err, 650 }; 651 652 static match_table_t befs_tokens = { 653 {Opt_uid, "uid=%d"}, 654 {Opt_gid, "gid=%d"}, 655 {Opt_charset, "iocharset=%s"}, 656 {Opt_debug, "debug"}, 657 {Opt_err, NULL} 658 }; 659 660 static int 661 parse_options(char *options, befs_mount_options * opts) 662 { 663 char *p; 664 substring_t args[MAX_OPT_ARGS]; 665 int option; 666 667 /* Initialize options */ 668 opts->uid = 0; 669 opts->gid = 0; 670 opts->use_uid = 0; 671 opts->use_gid = 0; 672 opts->iocharset = NULL; 673 opts->debug = 0; 674 675 if (!options) 676 return 1; 677 678 while ((p = strsep(&options, ",")) != NULL) { 679 int token; 680 if (!*p) 681 continue; 682 683 token = match_token(p, befs_tokens, args); 684 switch (token) { 685 case Opt_uid: 686 if (match_int(&args[0], &option)) 687 return 0; 688 if (option < 0) { 689 printk(KERN_ERR "BeFS: Invalid uid %d, " 690 "using default\n", option); 691 break; 692 } 693 opts->uid = option; 694 opts->use_uid = 1; 695 break; 696 case Opt_gid: 697 if (match_int(&args[0], &option)) 698 return 0; 699 if (option < 0) { 700 printk(KERN_ERR "BeFS: Invalid gid %d, " 701 "using default\n", option); 702 break; 703 } 704 opts->gid = option; 705 opts->use_gid = 1; 706 break; 707 case Opt_charset: 708 kfree(opts->iocharset); 709 opts->iocharset = match_strdup(&args[0]); 710 if (!opts->iocharset) { 711 printk(KERN_ERR "BeFS: allocation failure for " 712 "iocharset string\n"); 713 return 0; 714 } 715 break; 716 case Opt_debug: 717 opts->debug = 1; 718 break; 719 default: 720 printk(KERN_ERR "BeFS: Unrecognized mount option \"%s\" " 721 "or missing value\n", p); 722 return 0; 723 } 724 } 725 return 1; 726 } 727 728 /* This function has the responsibiltiy of getting the 729 * filesystem ready for unmounting. 730 * Basicly, we free everything that we allocated in 731 * befs_read_inode 732 */ 733 static void 734 befs_put_super(struct super_block *sb) 735 { 736 kfree(BEFS_SB(sb)->mount_opts.iocharset); 737 BEFS_SB(sb)->mount_opts.iocharset = NULL; 738 739 if (BEFS_SB(sb)->nls) { 740 unload_nls(BEFS_SB(sb)->nls); 741 BEFS_SB(sb)->nls = NULL; 742 } 743 744 kfree(sb->s_fs_info); 745 sb->s_fs_info = NULL; 746 return; 747 } 748 749 /* Allocate private field of the superblock, fill it. 750 * 751 * Finish filling the public superblock fields 752 * Make the root directory 753 * Load a set of NLS translations if needed. 754 */ 755 static int 756 befs_fill_super(struct super_block *sb, void *data, int silent) 757 { 758 struct buffer_head *bh; 759 befs_sb_info *befs_sb; 760 befs_super_block *disk_sb; 761 struct inode *root; 762 long ret = -EINVAL; 763 const unsigned long sb_block = 0; 764 const off_t x86_sb_off = 512; 765 766 save_mount_options(sb, data); 767 768 sb->s_fs_info = kmalloc(sizeof (*befs_sb), GFP_KERNEL); 769 if (sb->s_fs_info == NULL) { 770 printk(KERN_ERR 771 "BeFS(%s): Unable to allocate memory for private " 772 "portion of superblock. Bailing.\n", sb->s_id); 773 goto unacquire_none; 774 } 775 befs_sb = BEFS_SB(sb); 776 memset(befs_sb, 0, sizeof(befs_sb_info)); 777 778 if (!parse_options((char *) data, &befs_sb->mount_opts)) { 779 befs_error(sb, "cannot parse mount options"); 780 goto unacquire_priv_sbp; 781 } 782 783 befs_debug(sb, "---> befs_fill_super()"); 784 785 #ifndef CONFIG_BEFS_RW 786 if (!(sb->s_flags & MS_RDONLY)) { 787 befs_warning(sb, 788 "No write support. Marking filesystem read-only"); 789 sb->s_flags |= MS_RDONLY; 790 } 791 #endif /* CONFIG_BEFS_RW */ 792 793 /* 794 * Set dummy blocksize to read super block. 795 * Will be set to real fs blocksize later. 796 * 797 * Linux 2.4.10 and later refuse to read blocks smaller than 798 * the hardsect size for the device. But we also need to read at 799 * least 1k to get the second 512 bytes of the volume. 800 * -WD 10-26-01 801 */ 802 sb_min_blocksize(sb, 1024); 803 804 if (!(bh = sb_bread(sb, sb_block))) { 805 befs_error(sb, "unable to read superblock"); 806 goto unacquire_priv_sbp; 807 } 808 809 /* account for offset of super block on x86 */ 810 disk_sb = (befs_super_block *) bh->b_data; 811 if ((le32_to_cpu(disk_sb->magic1) == BEFS_SUPER_MAGIC1) || 812 (be32_to_cpu(disk_sb->magic1) == BEFS_SUPER_MAGIC1)) { 813 befs_debug(sb, "Using PPC superblock location"); 814 } else { 815 befs_debug(sb, "Using x86 superblock location"); 816 disk_sb = 817 (befs_super_block *) ((void *) bh->b_data + x86_sb_off); 818 } 819 820 if (befs_load_sb(sb, disk_sb) != BEFS_OK) 821 goto unacquire_bh; 822 823 befs_dump_super_block(sb, disk_sb); 824 825 brelse(bh); 826 827 if (befs_check_sb(sb) != BEFS_OK) 828 goto unacquire_priv_sbp; 829 830 if( befs_sb->num_blocks > ~((sector_t)0) ) { 831 befs_error(sb, "blocks count: %Lu " 832 "is larger than the host can use", 833 befs_sb->num_blocks); 834 goto unacquire_priv_sbp; 835 } 836 837 /* 838 * set up enough so that it can read an inode 839 * Fill in kernel superblock fields from private sb 840 */ 841 sb->s_magic = BEFS_SUPER_MAGIC; 842 /* Set real blocksize of fs */ 843 sb_set_blocksize(sb, (ulong) befs_sb->block_size); 844 sb->s_op = (struct super_operations *) &befs_sops; 845 root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir))); 846 if (IS_ERR(root)) { 847 ret = PTR_ERR(root); 848 goto unacquire_priv_sbp; 849 } 850 sb->s_root = d_alloc_root(root); 851 if (!sb->s_root) { 852 iput(root); 853 befs_error(sb, "get root inode failed"); 854 goto unacquire_priv_sbp; 855 } 856 857 /* load nls library */ 858 if (befs_sb->mount_opts.iocharset) { 859 befs_debug(sb, "Loading nls: %s", 860 befs_sb->mount_opts.iocharset); 861 befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset); 862 if (!befs_sb->nls) { 863 befs_warning(sb, "Cannot load nls %s" 864 " loading default nls", 865 befs_sb->mount_opts.iocharset); 866 befs_sb->nls = load_nls_default(); 867 } 868 /* load default nls if none is specified in mount options */ 869 } else { 870 befs_debug(sb, "Loading default nls"); 871 befs_sb->nls = load_nls_default(); 872 } 873 874 return 0; 875 /*****************/ 876 unacquire_bh: 877 brelse(bh); 878 879 unacquire_priv_sbp: 880 kfree(sb->s_fs_info); 881 882 unacquire_none: 883 sb->s_fs_info = NULL; 884 return ret; 885 } 886 887 static int 888 befs_remount(struct super_block *sb, int *flags, char *data) 889 { 890 if (!(*flags & MS_RDONLY)) 891 return -EINVAL; 892 return 0; 893 } 894 895 static int 896 befs_statfs(struct dentry *dentry, struct kstatfs *buf) 897 { 898 struct super_block *sb = dentry->d_sb; 899 900 befs_debug(sb, "---> befs_statfs()"); 901 902 buf->f_type = BEFS_SUPER_MAGIC; 903 buf->f_bsize = sb->s_blocksize; 904 buf->f_blocks = BEFS_SB(sb)->num_blocks; 905 buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks; 906 buf->f_bavail = buf->f_bfree; 907 buf->f_files = 0; /* UNKNOWN */ 908 buf->f_ffree = 0; /* UNKNOWN */ 909 buf->f_namelen = BEFS_NAME_LEN; 910 911 befs_debug(sb, "<--- befs_statfs()"); 912 913 return 0; 914 } 915 916 static int 917 befs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, 918 void *data, struct vfsmount *mnt) 919 { 920 return get_sb_bdev(fs_type, flags, dev_name, data, befs_fill_super, 921 mnt); 922 } 923 924 static struct file_system_type befs_fs_type = { 925 .owner = THIS_MODULE, 926 .name = "befs", 927 .get_sb = befs_get_sb, 928 .kill_sb = kill_block_super, 929 .fs_flags = FS_REQUIRES_DEV, 930 }; 931 932 static int __init 933 init_befs_fs(void) 934 { 935 int err; 936 937 printk(KERN_INFO "BeFS version: %s\n", BEFS_VERSION); 938 939 err = befs_init_inodecache(); 940 if (err) 941 goto unacquire_none; 942 943 err = register_filesystem(&befs_fs_type); 944 if (err) 945 goto unacquire_inodecache; 946 947 return 0; 948 949 unacquire_inodecache: 950 befs_destroy_inodecache(); 951 952 unacquire_none: 953 return err; 954 } 955 956 static void __exit 957 exit_befs_fs(void) 958 { 959 befs_destroy_inodecache(); 960 961 unregister_filesystem(&befs_fs_type); 962 } 963 964 /* 965 Macros that typecheck the init and exit functions, 966 ensures that they are called at init and cleanup, 967 and eliminates warnings about unused functions. 968 */ 969 module_init(init_befs_fs) 970 module_exit(exit_befs_fs) 971