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 #include "endian.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 *, struct nameidata *); 39 static void befs_read_inode(struct inode *ino); 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 super_block *, struct kstatfs *); 53 static int parse_options(char *, befs_mount_options *); 54 55 static const struct super_operations befs_sops = { 56 .read_inode = befs_read_inode, /* initialize & read inode */ 57 .alloc_inode = befs_alloc_inode, /* allocate a new inode */ 58 .destroy_inode = befs_destroy_inode, /* deallocate an inode */ 59 .put_super = befs_put_super, /* uninit super */ 60 .statfs = befs_statfs, /* statfs */ 61 .remount_fs = befs_remount, 62 }; 63 64 /* slab cache for befs_inode_info objects */ 65 static kmem_cache_t *befs_inode_cachep; 66 67 static const struct file_operations befs_dir_operations = { 68 .read = generic_read_dir, 69 .readdir = befs_readdir, 70 }; 71 72 static struct inode_operations befs_dir_inode_operations = { 73 .lookup = befs_lookup, 74 }; 75 76 static struct address_space_operations befs_aops = { 77 .readpage = befs_readpage, 78 .sync_page = block_sync_page, 79 .bmap = befs_bmap, 80 }; 81 82 static 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 = iget(dir->i_sb, (ino_t) offset); 203 if (!inode) 204 return ERR_PTR(-EACCES); 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_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_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 SLAB_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, kmem_cache_t * cachep, unsigned long flags) 294 { 295 struct befs_inode_info *bi = (struct befs_inode_info *) foo; 296 297 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == 298 SLAB_CTOR_CONSTRUCTOR) { 299 inode_init_once(&bi->vfs_inode); 300 } 301 } 302 303 static void 304 befs_read_inode(struct inode *inode) 305 { 306 struct buffer_head *bh = NULL; 307 befs_inode *raw_inode = NULL; 308 309 struct super_block *sb = inode->i_sb; 310 befs_sb_info *befs_sb = BEFS_SB(sb); 311 befs_inode_info *befs_ino = NULL; 312 313 befs_debug(sb, "---> befs_read_inode() " "inode = %lu", inode->i_ino); 314 315 befs_ino = BEFS_I(inode); 316 317 /* convert from vfs's inode number to befs's inode number */ 318 befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino); 319 320 befs_debug(sb, " real inode number [%u, %hu, %hu]", 321 befs_ino->i_inode_num.allocation_group, 322 befs_ino->i_inode_num.start, befs_ino->i_inode_num.len); 323 324 bh = befs_bread(sb, inode->i_ino); 325 if (!bh) { 326 befs_error(sb, "unable to read inode block - " 327 "inode = %lu", inode->i_ino); 328 goto unaquire_none; 329 } 330 331 raw_inode = (befs_inode *) bh->b_data; 332 333 befs_dump_inode(sb, raw_inode); 334 335 if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) { 336 befs_error(sb, "Bad inode: %lu", inode->i_ino); 337 goto unaquire_bh; 338 } 339 340 inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode); 341 342 /* 343 * set uid and gid. But since current BeOS is single user OS, so 344 * you can change by "uid" or "gid" options. 345 */ 346 347 inode->i_uid = befs_sb->mount_opts.use_uid ? 348 befs_sb->mount_opts.uid : (uid_t) fs32_to_cpu(sb, raw_inode->uid); 349 inode->i_gid = befs_sb->mount_opts.use_gid ? 350 befs_sb->mount_opts.gid : (gid_t) fs32_to_cpu(sb, raw_inode->gid); 351 352 inode->i_nlink = 1; 353 354 /* 355 * BEFS's time is 64 bits, but current VFS is 32 bits... 356 * BEFS don't have access time. Nor inode change time. VFS 357 * doesn't have creation time. 358 * Also, the lower 16 bits of the last_modified_time and 359 * create_time are just a counter to help ensure uniqueness 360 * for indexing purposes. (PFD, page 54) 361 */ 362 363 inode->i_mtime.tv_sec = 364 fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16; 365 inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */ 366 inode->i_ctime = inode->i_mtime; 367 inode->i_atime = inode->i_mtime; 368 inode->i_blksize = befs_sb->block_size; 369 370 befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num); 371 befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent); 372 befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes); 373 befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags); 374 375 if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){ 376 inode->i_size = 0; 377 inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE; 378 strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink, 379 BEFS_SYMLINK_LEN); 380 } else { 381 int num_blks; 382 383 befs_ino->i_data.ds = 384 fsds_to_cpu(sb, raw_inode->data.datastream); 385 386 num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds); 387 inode->i_blocks = 388 num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE); 389 inode->i_size = befs_ino->i_data.ds.size; 390 } 391 392 inode->i_mapping->a_ops = &befs_aops; 393 394 if (S_ISREG(inode->i_mode)) { 395 inode->i_fop = &generic_ro_fops; 396 } else if (S_ISDIR(inode->i_mode)) { 397 inode->i_op = &befs_dir_inode_operations; 398 inode->i_fop = &befs_dir_operations; 399 } else if (S_ISLNK(inode->i_mode)) { 400 inode->i_op = &befs_symlink_inode_operations; 401 } else { 402 befs_error(sb, "Inode %lu is not a regular file, " 403 "directory or symlink. THAT IS WRONG! BeFS has no " 404 "on disk special files", inode->i_ino); 405 goto unaquire_bh; 406 } 407 408 brelse(bh); 409 befs_debug(sb, "<--- befs_read_inode()"); 410 return; 411 412 unaquire_bh: 413 brelse(bh); 414 415 unaquire_none: 416 make_bad_inode(inode); 417 befs_debug(sb, "<--- befs_read_inode() - Bad inode"); 418 return; 419 } 420 421 /* Initialize the inode cache. Called at fs setup. 422 * 423 * Taken from NFS implementation by Al Viro. 424 */ 425 static int 426 befs_init_inodecache(void) 427 { 428 befs_inode_cachep = kmem_cache_create("befs_inode_cache", 429 sizeof (struct befs_inode_info), 430 0, (SLAB_RECLAIM_ACCOUNT| 431 SLAB_MEM_SPREAD), 432 init_once, NULL); 433 if (befs_inode_cachep == NULL) { 434 printk(KERN_ERR "befs_init_inodecache: " 435 "Couldn't initalize inode slabcache\n"); 436 return -ENOMEM; 437 } 438 439 return 0; 440 } 441 442 /* Called at fs teardown. 443 * 444 * Taken from NFS implementation by Al Viro. 445 */ 446 static void 447 befs_destroy_inodecache(void) 448 { 449 if (kmem_cache_destroy(befs_inode_cachep)) 450 printk(KERN_ERR "befs_destroy_inodecache: " 451 "not all structures were freed\n"); 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 *p = nd_get_link(nd); 493 if (!IS_ERR(p)) 494 kfree(p); 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 int maxlen = in_len; /* The utf8->nls conversion can't make more chars */ 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 int maxlen = 3 * in_len; 592 593 befs_debug(sb, "---> nls2utf()\n"); 594 595 if (!nls) { 596 befs_error(sb, "befs_nls2utf called with no NLS table loaded."); 597 return -EINVAL; 598 } 599 600 *out = result = kmalloc(maxlen, GFP_NOFS); 601 if (!*out) { 602 befs_error(sb, "befs_nls2utf() cannot allocate memory"); 603 *out_len = 0; 604 return -ENOMEM; 605 } 606 607 for (i = o = 0; i < in_len; i += unilen, o += utflen) { 608 609 /* convert from nls to unicode */ 610 unilen = nls->char2uni(&in[i], in_len - i, &uni); 611 if (unilen < 0) { 612 goto conv_err; 613 } 614 615 /* convert from unicode to UTF-8 */ 616 utflen = utf8_wctomb(&result[o], uni, 3); 617 if (utflen <= 0) { 618 goto conv_err; 619 } 620 } 621 622 result[o] = '\0'; 623 *out_len = o; 624 625 befs_debug(sb, "<--- nls2utf()"); 626 627 return i; 628 629 conv_err: 630 befs_error(sb, "Name using charecter set %s contains a charecter that " 631 "cannot be converted to unicode.", nls->charset); 632 befs_debug(sb, "<--- nls2utf()"); 633 kfree(result); 634 return -EILSEQ; 635 } 636 637 /** 638 * Use the 639 * 640 */ 641 enum { 642 Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err, 643 }; 644 645 static match_table_t befs_tokens = { 646 {Opt_uid, "uid=%d"}, 647 {Opt_gid, "gid=%d"}, 648 {Opt_charset, "iocharset=%s"}, 649 {Opt_debug, "debug"}, 650 {Opt_err, NULL} 651 }; 652 653 static int 654 parse_options(char *options, befs_mount_options * opts) 655 { 656 char *p; 657 substring_t args[MAX_OPT_ARGS]; 658 int option; 659 660 /* Initialize options */ 661 opts->uid = 0; 662 opts->gid = 0; 663 opts->use_uid = 0; 664 opts->use_gid = 0; 665 opts->iocharset = NULL; 666 opts->debug = 0; 667 668 if (!options) 669 return 1; 670 671 while ((p = strsep(&options, ",")) != NULL) { 672 int token; 673 if (!*p) 674 continue; 675 676 token = match_token(p, befs_tokens, args); 677 switch (token) { 678 case Opt_uid: 679 if (match_int(&args[0], &option)) 680 return 0; 681 if (option < 0) { 682 printk(KERN_ERR "BeFS: Invalid uid %d, " 683 "using default\n", option); 684 break; 685 } 686 opts->uid = option; 687 opts->use_uid = 1; 688 break; 689 case Opt_gid: 690 if (match_int(&args[0], &option)) 691 return 0; 692 if (option < 0) { 693 printk(KERN_ERR "BeFS: Invalid gid %d, " 694 "using default\n", option); 695 break; 696 } 697 opts->gid = option; 698 opts->use_gid = 1; 699 break; 700 case Opt_charset: 701 kfree(opts->iocharset); 702 opts->iocharset = match_strdup(&args[0]); 703 if (!opts->iocharset) { 704 printk(KERN_ERR "BeFS: allocation failure for " 705 "iocharset string\n"); 706 return 0; 707 } 708 break; 709 case Opt_debug: 710 opts->debug = 1; 711 break; 712 default: 713 printk(KERN_ERR "BeFS: Unrecognized mount option \"%s\" " 714 "or missing value\n", p); 715 return 0; 716 } 717 } 718 return 1; 719 } 720 721 /* This function has the responsibiltiy of getting the 722 * filesystem ready for unmounting. 723 * Basicly, we free everything that we allocated in 724 * befs_read_inode 725 */ 726 static void 727 befs_put_super(struct super_block *sb) 728 { 729 kfree(BEFS_SB(sb)->mount_opts.iocharset); 730 BEFS_SB(sb)->mount_opts.iocharset = NULL; 731 732 if (BEFS_SB(sb)->nls) { 733 unload_nls(BEFS_SB(sb)->nls); 734 BEFS_SB(sb)->nls = NULL; 735 } 736 737 kfree(sb->s_fs_info); 738 sb->s_fs_info = NULL; 739 return; 740 } 741 742 /* Allocate private field of the superblock, fill it. 743 * 744 * Finish filling the public superblock fields 745 * Make the root directory 746 * Load a set of NLS translations if needed. 747 */ 748 static int 749 befs_fill_super(struct super_block *sb, void *data, int silent) 750 { 751 struct buffer_head *bh; 752 befs_sb_info *befs_sb; 753 befs_super_block *disk_sb; 754 struct inode *root; 755 756 const unsigned long sb_block = 0; 757 const off_t x86_sb_off = 512; 758 759 sb->s_fs_info = kmalloc(sizeof (*befs_sb), GFP_KERNEL); 760 if (sb->s_fs_info == NULL) { 761 printk(KERN_ERR 762 "BeFS(%s): Unable to allocate memory for private " 763 "portion of superblock. Bailing.\n", sb->s_id); 764 goto unaquire_none; 765 } 766 befs_sb = BEFS_SB(sb); 767 memset(befs_sb, 0, sizeof(befs_sb_info)); 768 769 if (!parse_options((char *) data, &befs_sb->mount_opts)) { 770 befs_error(sb, "cannot parse mount options"); 771 goto unaquire_priv_sbp; 772 } 773 774 befs_debug(sb, "---> befs_fill_super()"); 775 776 #ifndef CONFIG_BEFS_RW 777 if (!(sb->s_flags & MS_RDONLY)) { 778 befs_warning(sb, 779 "No write support. Marking filesystem read-only"); 780 sb->s_flags |= MS_RDONLY; 781 } 782 #endif /* CONFIG_BEFS_RW */ 783 784 /* 785 * Set dummy blocksize to read super block. 786 * Will be set to real fs blocksize later. 787 * 788 * Linux 2.4.10 and later refuse to read blocks smaller than 789 * the hardsect size for the device. But we also need to read at 790 * least 1k to get the second 512 bytes of the volume. 791 * -WD 10-26-01 792 */ 793 sb_min_blocksize(sb, 1024); 794 795 if (!(bh = sb_bread(sb, sb_block))) { 796 befs_error(sb, "unable to read superblock"); 797 goto unaquire_priv_sbp; 798 } 799 800 /* account for offset of super block on x86 */ 801 disk_sb = (befs_super_block *) bh->b_data; 802 if ((le32_to_cpu(disk_sb->magic1) == BEFS_SUPER_MAGIC1) || 803 (be32_to_cpu(disk_sb->magic1) == BEFS_SUPER_MAGIC1)) { 804 befs_debug(sb, "Using PPC superblock location"); 805 } else { 806 befs_debug(sb, "Using x86 superblock location"); 807 disk_sb = 808 (befs_super_block *) ((void *) bh->b_data + x86_sb_off); 809 } 810 811 if (befs_load_sb(sb, disk_sb) != BEFS_OK) 812 goto unaquire_bh; 813 814 befs_dump_super_block(sb, disk_sb); 815 816 brelse(bh); 817 818 if (befs_check_sb(sb) != BEFS_OK) 819 goto unaquire_priv_sbp; 820 821 if( befs_sb->num_blocks > ~((sector_t)0) ) { 822 befs_error(sb, "blocks count: %Lu " 823 "is larger than the host can use", 824 befs_sb->num_blocks); 825 goto unaquire_priv_sbp; 826 } 827 828 /* 829 * set up enough so that it can read an inode 830 * Fill in kernel superblock fields from private sb 831 */ 832 sb->s_magic = BEFS_SUPER_MAGIC; 833 /* Set real blocksize of fs */ 834 sb_set_blocksize(sb, (ulong) befs_sb->block_size); 835 sb->s_op = (struct super_operations *) &befs_sops; 836 root = iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir))); 837 sb->s_root = d_alloc_root(root); 838 if (!sb->s_root) { 839 iput(root); 840 befs_error(sb, "get root inode failed"); 841 goto unaquire_priv_sbp; 842 } 843 844 /* load nls library */ 845 if (befs_sb->mount_opts.iocharset) { 846 befs_debug(sb, "Loading nls: %s", 847 befs_sb->mount_opts.iocharset); 848 befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset); 849 if (!befs_sb->nls) { 850 befs_warning(sb, "Cannot load nls %s" 851 " loading default nls", 852 befs_sb->mount_opts.iocharset); 853 befs_sb->nls = load_nls_default(); 854 } 855 /* load default nls if none is specified in mount options */ 856 } else { 857 befs_debug(sb, "Loading default nls"); 858 befs_sb->nls = load_nls_default(); 859 } 860 861 return 0; 862 /*****************/ 863 unaquire_bh: 864 brelse(bh); 865 866 unaquire_priv_sbp: 867 kfree(sb->s_fs_info); 868 869 unaquire_none: 870 sb->s_fs_info = NULL; 871 return -EINVAL; 872 } 873 874 static int 875 befs_remount(struct super_block *sb, int *flags, char *data) 876 { 877 if (!(*flags & MS_RDONLY)) 878 return -EINVAL; 879 return 0; 880 } 881 882 static int 883 befs_statfs(struct super_block *sb, struct kstatfs *buf) 884 { 885 886 befs_debug(sb, "---> befs_statfs()"); 887 888 buf->f_type = BEFS_SUPER_MAGIC; 889 buf->f_bsize = sb->s_blocksize; 890 buf->f_blocks = BEFS_SB(sb)->num_blocks; 891 buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks; 892 buf->f_bavail = buf->f_bfree; 893 buf->f_files = 0; /* UNKNOWN */ 894 buf->f_ffree = 0; /* UNKNOWN */ 895 buf->f_namelen = BEFS_NAME_LEN; 896 897 befs_debug(sb, "<--- befs_statfs()"); 898 899 return 0; 900 } 901 902 static struct super_block * 903 befs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, 904 void *data) 905 { 906 return get_sb_bdev(fs_type, flags, dev_name, data, befs_fill_super); 907 } 908 909 static struct file_system_type befs_fs_type = { 910 .owner = THIS_MODULE, 911 .name = "befs", 912 .get_sb = befs_get_sb, 913 .kill_sb = kill_block_super, 914 .fs_flags = FS_REQUIRES_DEV, 915 }; 916 917 static int __init 918 init_befs_fs(void) 919 { 920 int err; 921 922 printk(KERN_INFO "BeFS version: %s\n", BEFS_VERSION); 923 924 err = befs_init_inodecache(); 925 if (err) 926 goto unaquire_none; 927 928 err = register_filesystem(&befs_fs_type); 929 if (err) 930 goto unaquire_inodecache; 931 932 return 0; 933 934 unaquire_inodecache: 935 befs_destroy_inodecache(); 936 937 unaquire_none: 938 return err; 939 } 940 941 static void __exit 942 exit_befs_fs(void) 943 { 944 befs_destroy_inodecache(); 945 946 unregister_filesystem(&befs_fs_type); 947 } 948 949 /* 950 Macros that typecheck the init and exit functions, 951 ensures that they are called at init and cleanup, 952 and eliminates warnings about unused functions. 953 */ 954 module_init(init_befs_fs) 955 module_exit(exit_befs_fs) 956