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 void befs_read_inode(struct inode *ino); 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 .read_inode = befs_read_inode, /* initialize & read inode */ 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 }; 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 = iget(dir->i_sb, (ino_t) offset); 202 if (!inode) 203 return ERR_PTR(-EACCES); 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, struct kmem_cache * cachep, unsigned long flags) 293 { 294 struct befs_inode_info *bi = (struct befs_inode_info *) foo; 295 296 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == 297 SLAB_CTOR_CONSTRUCTOR) { 298 inode_init_once(&bi->vfs_inode); 299 } 300 } 301 302 static void 303 befs_read_inode(struct inode *inode) 304 { 305 struct buffer_head *bh = NULL; 306 befs_inode *raw_inode = NULL; 307 308 struct super_block *sb = inode->i_sb; 309 befs_sb_info *befs_sb = BEFS_SB(sb); 310 befs_inode_info *befs_ino = NULL; 311 312 befs_debug(sb, "---> befs_read_inode() " "inode = %lu", inode->i_ino); 313 314 befs_ino = BEFS_I(inode); 315 316 /* convert from vfs's inode number to befs's inode number */ 317 befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino); 318 319 befs_debug(sb, " real inode number [%u, %hu, %hu]", 320 befs_ino->i_inode_num.allocation_group, 321 befs_ino->i_inode_num.start, befs_ino->i_inode_num.len); 322 323 bh = befs_bread(sb, inode->i_ino); 324 if (!bh) { 325 befs_error(sb, "unable to read inode block - " 326 "inode = %lu", inode->i_ino); 327 goto unacquire_none; 328 } 329 330 raw_inode = (befs_inode *) bh->b_data; 331 332 befs_dump_inode(sb, raw_inode); 333 334 if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) { 335 befs_error(sb, "Bad inode: %lu", inode->i_ino); 336 goto unacquire_bh; 337 } 338 339 inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode); 340 341 /* 342 * set uid and gid. But since current BeOS is single user OS, so 343 * you can change by "uid" or "gid" options. 344 */ 345 346 inode->i_uid = befs_sb->mount_opts.use_uid ? 347 befs_sb->mount_opts.uid : (uid_t) fs32_to_cpu(sb, raw_inode->uid); 348 inode->i_gid = befs_sb->mount_opts.use_gid ? 349 befs_sb->mount_opts.gid : (gid_t) fs32_to_cpu(sb, raw_inode->gid); 350 351 inode->i_nlink = 1; 352 353 /* 354 * BEFS's time is 64 bits, but current VFS is 32 bits... 355 * BEFS don't have access time. Nor inode change time. VFS 356 * doesn't have creation time. 357 * Also, the lower 16 bits of the last_modified_time and 358 * create_time are just a counter to help ensure uniqueness 359 * for indexing purposes. (PFD, page 54) 360 */ 361 362 inode->i_mtime.tv_sec = 363 fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16; 364 inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */ 365 inode->i_ctime = inode->i_mtime; 366 inode->i_atime = inode->i_mtime; 367 368 befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num); 369 befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent); 370 befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes); 371 befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags); 372 373 if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){ 374 inode->i_size = 0; 375 inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE; 376 strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink, 377 BEFS_SYMLINK_LEN); 378 } else { 379 int num_blks; 380 381 befs_ino->i_data.ds = 382 fsds_to_cpu(sb, raw_inode->data.datastream); 383 384 num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds); 385 inode->i_blocks = 386 num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE); 387 inode->i_size = befs_ino->i_data.ds.size; 388 } 389 390 inode->i_mapping->a_ops = &befs_aops; 391 392 if (S_ISREG(inode->i_mode)) { 393 inode->i_fop = &generic_ro_fops; 394 } else if (S_ISDIR(inode->i_mode)) { 395 inode->i_op = &befs_dir_inode_operations; 396 inode->i_fop = &befs_dir_operations; 397 } else if (S_ISLNK(inode->i_mode)) { 398 inode->i_op = &befs_symlink_inode_operations; 399 } else { 400 befs_error(sb, "Inode %lu is not a regular file, " 401 "directory or symlink. THAT IS WRONG! BeFS has no " 402 "on disk special files", inode->i_ino); 403 goto unacquire_bh; 404 } 405 406 brelse(bh); 407 befs_debug(sb, "<--- befs_read_inode()"); 408 return; 409 410 unacquire_bh: 411 brelse(bh); 412 413 unacquire_none: 414 make_bad_inode(inode); 415 befs_debug(sb, "<--- befs_read_inode() - Bad inode"); 416 return; 417 } 418 419 /* Initialize the inode cache. Called at fs setup. 420 * 421 * Taken from NFS implementation by Al Viro. 422 */ 423 static int 424 befs_init_inodecache(void) 425 { 426 befs_inode_cachep = kmem_cache_create("befs_inode_cache", 427 sizeof (struct befs_inode_info), 428 0, (SLAB_RECLAIM_ACCOUNT| 429 SLAB_MEM_SPREAD), 430 init_once, NULL); 431 if (befs_inode_cachep == NULL) { 432 printk(KERN_ERR "befs_init_inodecache: " 433 "Couldn't initalize inode slabcache\n"); 434 return -ENOMEM; 435 } 436 437 return 0; 438 } 439 440 /* Called at fs teardown. 441 * 442 * Taken from NFS implementation by Al Viro. 443 */ 444 static void 445 befs_destroy_inodecache(void) 446 { 447 kmem_cache_destroy(befs_inode_cachep); 448 } 449 450 /* 451 * The inode of symbolic link is different to data stream. 452 * The data stream become link name. Unless the LONG_SYMLINK 453 * flag is set. 454 */ 455 static void * 456 befs_follow_link(struct dentry *dentry, struct nameidata *nd) 457 { 458 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); 459 char *link; 460 461 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { 462 struct super_block *sb = dentry->d_sb; 463 befs_data_stream *data = &befs_ino->i_data.ds; 464 befs_off_t len = data->size; 465 466 befs_debug(sb, "Follow long symlink"); 467 468 link = kmalloc(len, GFP_NOFS); 469 if (!link) { 470 link = ERR_PTR(-ENOMEM); 471 } else if (befs_read_lsymlink(sb, data, link, len) != len) { 472 kfree(link); 473 befs_error(sb, "Failed to read entire long symlink"); 474 link = ERR_PTR(-EIO); 475 } 476 } else { 477 link = befs_ino->i_data.symlink; 478 } 479 480 nd_set_link(nd, link); 481 return NULL; 482 } 483 484 static void befs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 485 { 486 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); 487 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { 488 char *p = nd_get_link(nd); 489 if (!IS_ERR(p)) 490 kfree(p); 491 } 492 } 493 494 /* 495 * UTF-8 to NLS charset convert routine 496 * 497 * 498 * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than 499 * the nls tables directly 500 */ 501 502 static int 503 befs_utf2nls(struct super_block *sb, const char *in, 504 int in_len, char **out, int *out_len) 505 { 506 struct nls_table *nls = BEFS_SB(sb)->nls; 507 int i, o; 508 wchar_t uni; 509 int unilen, utflen; 510 char *result; 511 /* The utf8->nls conversion won't make the final nls string bigger 512 * than the utf one, but if the string is pure ascii they'll have the 513 * same width and an extra char is needed to save the additional \0 514 */ 515 int maxlen = in_len + 1; 516 517 befs_debug(sb, "---> utf2nls()"); 518 519 if (!nls) { 520 befs_error(sb, "befs_utf2nls called with no NLS table loaded"); 521 return -EINVAL; 522 } 523 524 *out = result = kmalloc(maxlen, GFP_NOFS); 525 if (!*out) { 526 befs_error(sb, "befs_utf2nls() cannot allocate memory"); 527 *out_len = 0; 528 return -ENOMEM; 529 } 530 531 for (i = o = 0; i < in_len; i += utflen, o += unilen) { 532 533 /* convert from UTF-8 to Unicode */ 534 utflen = utf8_mbtowc(&uni, &in[i], in_len - i); 535 if (utflen < 0) { 536 goto conv_err; 537 } 538 539 /* convert from Unicode to nls */ 540 unilen = nls->uni2char(uni, &result[o], in_len - o); 541 if (unilen < 0) { 542 goto conv_err; 543 } 544 } 545 result[o] = '\0'; 546 *out_len = o; 547 548 befs_debug(sb, "<--- utf2nls()"); 549 550 return o; 551 552 conv_err: 553 befs_error(sb, "Name using character set %s contains a character that " 554 "cannot be converted to unicode.", nls->charset); 555 befs_debug(sb, "<--- utf2nls()"); 556 kfree(result); 557 return -EILSEQ; 558 } 559 560 /** 561 * befs_nls2utf - Convert NLS string to utf8 encodeing 562 * @sb: Superblock 563 * @src: Input string buffer in NLS format 564 * @srclen: Length of input string in bytes 565 * @dest: The output string in UTF-8 format 566 * @destlen: Length of the output buffer 567 * 568 * Converts input string @src, which is in the format of the loaded NLS map, 569 * into a utf8 string. 570 * 571 * The destination string @dest is allocated by this function and the caller is 572 * responsible for freeing it with kfree() 573 * 574 * On return, *@destlen is the length of @dest in bytes. 575 * 576 * On success, the return value is the number of utf8 characters written to 577 * the output buffer @dest. 578 * 579 * On Failure, a negative number coresponding to the error code is returned. 580 */ 581 582 static int 583 befs_nls2utf(struct super_block *sb, const char *in, 584 int in_len, char **out, int *out_len) 585 { 586 struct nls_table *nls = BEFS_SB(sb)->nls; 587 int i, o; 588 wchar_t uni; 589 int unilen, utflen; 590 char *result; 591 /* There're nls characters that will translate to 3-chars-wide UTF-8 592 * characters, a additional byte is needed to save the final \0 593 * in special cases */ 594 int maxlen = (3 * in_len) + 1; 595 596 befs_debug(sb, "---> nls2utf()\n"); 597 598 if (!nls) { 599 befs_error(sb, "befs_nls2utf called with no NLS table loaded."); 600 return -EINVAL; 601 } 602 603 *out = result = kmalloc(maxlen, GFP_NOFS); 604 if (!*out) { 605 befs_error(sb, "befs_nls2utf() cannot allocate memory"); 606 *out_len = 0; 607 return -ENOMEM; 608 } 609 610 for (i = o = 0; i < in_len; i += unilen, o += utflen) { 611 612 /* convert from nls to unicode */ 613 unilen = nls->char2uni(&in[i], in_len - i, &uni); 614 if (unilen < 0) { 615 goto conv_err; 616 } 617 618 /* convert from unicode to UTF-8 */ 619 utflen = utf8_wctomb(&result[o], uni, 3); 620 if (utflen <= 0) { 621 goto conv_err; 622 } 623 } 624 625 result[o] = '\0'; 626 *out_len = o; 627 628 befs_debug(sb, "<--- nls2utf()"); 629 630 return i; 631 632 conv_err: 633 befs_error(sb, "Name using charecter set %s contains a charecter that " 634 "cannot be converted to unicode.", nls->charset); 635 befs_debug(sb, "<--- nls2utf()"); 636 kfree(result); 637 return -EILSEQ; 638 } 639 640 /** 641 * Use the 642 * 643 */ 644 enum { 645 Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err, 646 }; 647 648 static match_table_t befs_tokens = { 649 {Opt_uid, "uid=%d"}, 650 {Opt_gid, "gid=%d"}, 651 {Opt_charset, "iocharset=%s"}, 652 {Opt_debug, "debug"}, 653 {Opt_err, NULL} 654 }; 655 656 static int 657 parse_options(char *options, befs_mount_options * opts) 658 { 659 char *p; 660 substring_t args[MAX_OPT_ARGS]; 661 int option; 662 663 /* Initialize options */ 664 opts->uid = 0; 665 opts->gid = 0; 666 opts->use_uid = 0; 667 opts->use_gid = 0; 668 opts->iocharset = NULL; 669 opts->debug = 0; 670 671 if (!options) 672 return 1; 673 674 while ((p = strsep(&options, ",")) != NULL) { 675 int token; 676 if (!*p) 677 continue; 678 679 token = match_token(p, befs_tokens, args); 680 switch (token) { 681 case Opt_uid: 682 if (match_int(&args[0], &option)) 683 return 0; 684 if (option < 0) { 685 printk(KERN_ERR "BeFS: Invalid uid %d, " 686 "using default\n", option); 687 break; 688 } 689 opts->uid = option; 690 opts->use_uid = 1; 691 break; 692 case Opt_gid: 693 if (match_int(&args[0], &option)) 694 return 0; 695 if (option < 0) { 696 printk(KERN_ERR "BeFS: Invalid gid %d, " 697 "using default\n", option); 698 break; 699 } 700 opts->gid = option; 701 opts->use_gid = 1; 702 break; 703 case Opt_charset: 704 kfree(opts->iocharset); 705 opts->iocharset = match_strdup(&args[0]); 706 if (!opts->iocharset) { 707 printk(KERN_ERR "BeFS: allocation failure for " 708 "iocharset string\n"); 709 return 0; 710 } 711 break; 712 case Opt_debug: 713 opts->debug = 1; 714 break; 715 default: 716 printk(KERN_ERR "BeFS: Unrecognized mount option \"%s\" " 717 "or missing value\n", p); 718 return 0; 719 } 720 } 721 return 1; 722 } 723 724 /* This function has the responsibiltiy of getting the 725 * filesystem ready for unmounting. 726 * Basicly, we free everything that we allocated in 727 * befs_read_inode 728 */ 729 static void 730 befs_put_super(struct super_block *sb) 731 { 732 kfree(BEFS_SB(sb)->mount_opts.iocharset); 733 BEFS_SB(sb)->mount_opts.iocharset = NULL; 734 735 if (BEFS_SB(sb)->nls) { 736 unload_nls(BEFS_SB(sb)->nls); 737 BEFS_SB(sb)->nls = NULL; 738 } 739 740 kfree(sb->s_fs_info); 741 sb->s_fs_info = NULL; 742 return; 743 } 744 745 /* Allocate private field of the superblock, fill it. 746 * 747 * Finish filling the public superblock fields 748 * Make the root directory 749 * Load a set of NLS translations if needed. 750 */ 751 static int 752 befs_fill_super(struct super_block *sb, void *data, int silent) 753 { 754 struct buffer_head *bh; 755 befs_sb_info *befs_sb; 756 befs_super_block *disk_sb; 757 struct inode *root; 758 759 const unsigned long sb_block = 0; 760 const off_t x86_sb_off = 512; 761 762 sb->s_fs_info = kmalloc(sizeof (*befs_sb), GFP_KERNEL); 763 if (sb->s_fs_info == NULL) { 764 printk(KERN_ERR 765 "BeFS(%s): Unable to allocate memory for private " 766 "portion of superblock. Bailing.\n", sb->s_id); 767 goto unacquire_none; 768 } 769 befs_sb = BEFS_SB(sb); 770 memset(befs_sb, 0, sizeof(befs_sb_info)); 771 772 if (!parse_options((char *) data, &befs_sb->mount_opts)) { 773 befs_error(sb, "cannot parse mount options"); 774 goto unacquire_priv_sbp; 775 } 776 777 befs_debug(sb, "---> befs_fill_super()"); 778 779 #ifndef CONFIG_BEFS_RW 780 if (!(sb->s_flags & MS_RDONLY)) { 781 befs_warning(sb, 782 "No write support. Marking filesystem read-only"); 783 sb->s_flags |= MS_RDONLY; 784 } 785 #endif /* CONFIG_BEFS_RW */ 786 787 /* 788 * Set dummy blocksize to read super block. 789 * Will be set to real fs blocksize later. 790 * 791 * Linux 2.4.10 and later refuse to read blocks smaller than 792 * the hardsect size for the device. But we also need to read at 793 * least 1k to get the second 512 bytes of the volume. 794 * -WD 10-26-01 795 */ 796 sb_min_blocksize(sb, 1024); 797 798 if (!(bh = sb_bread(sb, sb_block))) { 799 befs_error(sb, "unable to read superblock"); 800 goto unacquire_priv_sbp; 801 } 802 803 /* account for offset of super block on x86 */ 804 disk_sb = (befs_super_block *) bh->b_data; 805 if ((le32_to_cpu(disk_sb->magic1) == BEFS_SUPER_MAGIC1) || 806 (be32_to_cpu(disk_sb->magic1) == BEFS_SUPER_MAGIC1)) { 807 befs_debug(sb, "Using PPC superblock location"); 808 } else { 809 befs_debug(sb, "Using x86 superblock location"); 810 disk_sb = 811 (befs_super_block *) ((void *) bh->b_data + x86_sb_off); 812 } 813 814 if (befs_load_sb(sb, disk_sb) != BEFS_OK) 815 goto unacquire_bh; 816 817 befs_dump_super_block(sb, disk_sb); 818 819 brelse(bh); 820 821 if (befs_check_sb(sb) != BEFS_OK) 822 goto unacquire_priv_sbp; 823 824 if( befs_sb->num_blocks > ~((sector_t)0) ) { 825 befs_error(sb, "blocks count: %Lu " 826 "is larger than the host can use", 827 befs_sb->num_blocks); 828 goto unacquire_priv_sbp; 829 } 830 831 /* 832 * set up enough so that it can read an inode 833 * Fill in kernel superblock fields from private sb 834 */ 835 sb->s_magic = BEFS_SUPER_MAGIC; 836 /* Set real blocksize of fs */ 837 sb_set_blocksize(sb, (ulong) befs_sb->block_size); 838 sb->s_op = (struct super_operations *) &befs_sops; 839 root = iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir))); 840 sb->s_root = d_alloc_root(root); 841 if (!sb->s_root) { 842 iput(root); 843 befs_error(sb, "get root inode failed"); 844 goto unacquire_priv_sbp; 845 } 846 847 /* load nls library */ 848 if (befs_sb->mount_opts.iocharset) { 849 befs_debug(sb, "Loading nls: %s", 850 befs_sb->mount_opts.iocharset); 851 befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset); 852 if (!befs_sb->nls) { 853 befs_warning(sb, "Cannot load nls %s" 854 " loading default nls", 855 befs_sb->mount_opts.iocharset); 856 befs_sb->nls = load_nls_default(); 857 } 858 /* load default nls if none is specified in mount options */ 859 } else { 860 befs_debug(sb, "Loading default nls"); 861 befs_sb->nls = load_nls_default(); 862 } 863 864 return 0; 865 /*****************/ 866 unacquire_bh: 867 brelse(bh); 868 869 unacquire_priv_sbp: 870 kfree(sb->s_fs_info); 871 872 unacquire_none: 873 sb->s_fs_info = NULL; 874 return -EINVAL; 875 } 876 877 static int 878 befs_remount(struct super_block *sb, int *flags, char *data) 879 { 880 if (!(*flags & MS_RDONLY)) 881 return -EINVAL; 882 return 0; 883 } 884 885 static int 886 befs_statfs(struct dentry *dentry, struct kstatfs *buf) 887 { 888 struct super_block *sb = dentry->d_sb; 889 890 befs_debug(sb, "---> befs_statfs()"); 891 892 buf->f_type = BEFS_SUPER_MAGIC; 893 buf->f_bsize = sb->s_blocksize; 894 buf->f_blocks = BEFS_SB(sb)->num_blocks; 895 buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks; 896 buf->f_bavail = buf->f_bfree; 897 buf->f_files = 0; /* UNKNOWN */ 898 buf->f_ffree = 0; /* UNKNOWN */ 899 buf->f_namelen = BEFS_NAME_LEN; 900 901 befs_debug(sb, "<--- befs_statfs()"); 902 903 return 0; 904 } 905 906 static int 907 befs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, 908 void *data, struct vfsmount *mnt) 909 { 910 return get_sb_bdev(fs_type, flags, dev_name, data, befs_fill_super, 911 mnt); 912 } 913 914 static struct file_system_type befs_fs_type = { 915 .owner = THIS_MODULE, 916 .name = "befs", 917 .get_sb = befs_get_sb, 918 .kill_sb = kill_block_super, 919 .fs_flags = FS_REQUIRES_DEV, 920 }; 921 922 static int __init 923 init_befs_fs(void) 924 { 925 int err; 926 927 printk(KERN_INFO "BeFS version: %s\n", BEFS_VERSION); 928 929 err = befs_init_inodecache(); 930 if (err) 931 goto unacquire_none; 932 933 err = register_filesystem(&befs_fs_type); 934 if (err) 935 goto unacquire_inodecache; 936 937 return 0; 938 939 unacquire_inodecache: 940 befs_destroy_inodecache(); 941 942 unacquire_none: 943 return err; 944 } 945 946 static void __exit 947 exit_befs_fs(void) 948 { 949 befs_destroy_inodecache(); 950 951 unregister_filesystem(&befs_fs_type); 952 } 953 954 /* 955 Macros that typecheck the init and exit functions, 956 ensures that they are called at init and cleanup, 957 and eliminates warnings about unused functions. 958 */ 959 module_init(init_befs_fs) 960 module_exit(exit_befs_fs) 961