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 26MODULE_DESCRIPTION("BeOS File System (BeFS) driver"); 27MODULE_AUTHOR("Will Dyson"); 28MODULE_LICENSE("GPL"); 29 30/* The units the vfs expects inode->i_blocks to be in */ 31#define VFS_BLOCK_SIZE 512 32 33static int befs_readdir(struct file *, void *, filldir_t); 34static int befs_get_block(struct inode *, sector_t, struct buffer_head *, int); 35static int befs_readpage(struct file *file, struct page *page); 36static sector_t befs_bmap(struct address_space *mapping, sector_t block); 37static struct dentry *befs_lookup(struct inode *, struct dentry *, struct nameidata *); 38static struct inode *befs_iget(struct super_block *, unsigned long); 39static struct inode *befs_alloc_inode(struct super_block *sb); 40static void befs_destroy_inode(struct inode *inode); 41static int befs_init_inodecache(void); 42static void befs_destroy_inodecache(void); 43static void *befs_follow_link(struct dentry *, struct nameidata *); 44static void befs_put_link(struct dentry *, struct nameidata *, void *); 45static int befs_utf2nls(struct super_block *sb, const char *in, int in_len, 46 char **out, int *out_len); 47static int befs_nls2utf(struct super_block *sb, const char *in, int in_len, 48 char **out, int *out_len); 49static void befs_put_super(struct super_block *); 50static int befs_remount(struct super_block *, int *, char *); 51static int befs_statfs(struct dentry *, struct kstatfs *); 52static int parse_options(char *, befs_mount_options *); 53 54static 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 */ 64static struct kmem_cache *befs_inode_cachep; 65 66static const struct file_operations befs_dir_operations = { 67 .read = generic_read_dir, 68 .readdir = befs_readdir, 69 .llseek = generic_file_llseek, 70}; 71 72static const struct inode_operations befs_dir_inode_operations = { 73 .lookup = befs_lookup, 74}; 75 76static const struct address_space_operations befs_aops = { 77 .readpage = befs_readpage, 78 .sync_page = block_sync_page, 79 .bmap = befs_bmap, 80}; 81 82static 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 */ 95static int 96befs_readpage(struct file *file, struct page *page) 97{ 98 return block_read_full_page(page, befs_get_block); 99} 100 101static sector_t 102befs_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 118static int 119befs_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 162static struct dentry * 163befs_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 213static int 214befs_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 276static struct inode * 277befs_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 287static void 288befs_destroy_inode(struct inode *inode) 289{ 290 kmem_cache_free(befs_inode_cachep, BEFS_I(inode)); 291} 292 293static 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 300static 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 - 1); 382 befs_ino->i_data.symlink[BEFS_SYMLINK_LEN - 1] = '\0'; 383 } else { 384 int num_blks; 385 386 befs_ino->i_data.ds = 387 fsds_to_cpu(sb, raw_inode->data.datastream); 388 389 num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds); 390 inode->i_blocks = 391 num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE); 392 inode->i_size = befs_ino->i_data.ds.size; 393 } 394 395 inode->i_mapping->a_ops = &befs_aops; 396 397 if (S_ISREG(inode->i_mode)) { 398 inode->i_fop = &generic_ro_fops; 399 } else if (S_ISDIR(inode->i_mode)) { 400 inode->i_op = &befs_dir_inode_operations; 401 inode->i_fop = &befs_dir_operations; 402 } else if (S_ISLNK(inode->i_mode)) { 403 inode->i_op = &befs_symlink_inode_operations; 404 } else { 405 befs_error(sb, "Inode %lu is not a regular file, " 406 "directory or symlink. THAT IS WRONG! BeFS has no " 407 "on disk special files", inode->i_ino); 408 goto unacquire_bh; 409 } 410 411 brelse(bh); 412 befs_debug(sb, "<--- befs_read_inode()"); 413 unlock_new_inode(inode); 414 return inode; 415 416 unacquire_bh: 417 brelse(bh); 418 419 unacquire_none: 420 iget_failed(inode); 421 befs_debug(sb, "<--- befs_read_inode() - Bad inode"); 422 return ERR_PTR(ret); 423} 424 425/* Initialize the inode cache. Called at fs setup. 426 * 427 * Taken from NFS implementation by Al Viro. 428 */ 429static int 430befs_init_inodecache(void) 431{ 432 befs_inode_cachep = kmem_cache_create("befs_inode_cache", 433 sizeof (struct befs_inode_info), 434 0, (SLAB_RECLAIM_ACCOUNT| 435 SLAB_MEM_SPREAD), 436 init_once); 437 if (befs_inode_cachep == NULL) { 438 printk(KERN_ERR "befs_init_inodecache: " 439 "Couldn't initialize inode slabcache\n"); 440 return -ENOMEM; 441 } 442 443 return 0; 444} 445 446/* Called at fs teardown. 447 * 448 * Taken from NFS implementation by Al Viro. 449 */ 450static void 451befs_destroy_inodecache(void) 452{ 453 kmem_cache_destroy(befs_inode_cachep); 454} 455 456/* 457 * The inode of symbolic link is different to data stream. 458 * The data stream become link name. Unless the LONG_SYMLINK 459 * flag is set. 460 */ 461static void * 462befs_follow_link(struct dentry *dentry, struct nameidata *nd) 463{ 464 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); 465 char *link; 466 467 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { 468 struct super_block *sb = dentry->d_sb; 469 befs_data_stream *data = &befs_ino->i_data.ds; 470 befs_off_t len = data->size; 471 472 befs_debug(sb, "Follow long symlink"); 473 474 link = kmalloc(len, GFP_NOFS); 475 if (!link) { 476 link = ERR_PTR(-ENOMEM); 477 } else if (befs_read_lsymlink(sb, data, link, len) != len) { 478 kfree(link); 479 befs_error(sb, "Failed to read entire long symlink"); 480 link = ERR_PTR(-EIO); 481 } else { 482 link[len - 1] = '\0'; 483 } 484 } else { 485 link = befs_ino->i_data.symlink; 486 } 487 488 nd_set_link(nd, link); 489 return NULL; 490} 491 492static void befs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 493{ 494 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); 495 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { 496 char *link = nd_get_link(nd); 497 if (!IS_ERR(link)) 498 kfree(link); 499 } 500} 501 502/* 503 * UTF-8 to NLS charset convert routine 504 * 505 * 506 * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than 507 * the nls tables directly 508 */ 509 510static int 511befs_utf2nls(struct super_block *sb, const char *in, 512 int in_len, char **out, int *out_len) 513{ 514 struct nls_table *nls = BEFS_SB(sb)->nls; 515 int i, o; 516 unicode_t uni; 517 int unilen, utflen; 518 char *result; 519 /* The utf8->nls conversion won't make the final nls string bigger 520 * than the utf one, but if the string is pure ascii they'll have the 521 * same width and an extra char is needed to save the additional \0 522 */ 523 int maxlen = in_len + 1; 524 525 befs_debug(sb, "---> utf2nls()"); 526 527 if (!nls) { 528 befs_error(sb, "befs_utf2nls called with no NLS table loaded"); 529 return -EINVAL; 530 } 531 532 *out = result = kmalloc(maxlen, GFP_NOFS); 533 if (!*out) { 534 befs_error(sb, "befs_utf2nls() cannot allocate memory"); 535 *out_len = 0; 536 return -ENOMEM; 537 } 538 539 for (i = o = 0; i < in_len; i += utflen, o += unilen) { 540 541 /* convert from UTF-8 to Unicode */ 542 utflen = utf8_to_utf32(&in[i], in_len - i, &uni); 543 if (utflen < 0) 544 goto conv_err; 545 546 /* convert from Unicode to nls */ 547 if (uni > MAX_WCHAR_T) 548 goto conv_err; 549 unilen = nls->uni2char(uni, &result[o], in_len - o); 550 if (unilen < 0) 551 goto conv_err; 552 } 553 result[o] = '\0'; 554 *out_len = o; 555 556 befs_debug(sb, "<--- utf2nls()"); 557 558 return o; 559 560 conv_err: 561 befs_error(sb, "Name using character set %s contains a character that " 562 "cannot be converted to unicode.", nls->charset); 563 befs_debug(sb, "<--- utf2nls()"); 564 kfree(result); 565 return -EILSEQ; 566} 567 568/** 569 * befs_nls2utf - Convert NLS string to utf8 encodeing 570 * @sb: Superblock 571 * @src: Input string buffer in NLS format 572 * @srclen: Length of input string in bytes 573 * @dest: The output string in UTF-8 format 574 * @destlen: Length of the output buffer 575 * 576 * Converts input string @src, which is in the format of the loaded NLS map, 577 * into a utf8 string. 578 * 579 * The destination string @dest is allocated by this function and the caller is 580 * responsible for freeing it with kfree() 581 * 582 * On return, *@destlen is the length of @dest in bytes. 583 * 584 * On success, the return value is the number of utf8 characters written to 585 * the output buffer @dest. 586 * 587 * On Failure, a negative number coresponding to the error code is returned. 588 */ 589 590static int 591befs_nls2utf(struct super_block *sb, const char *in, 592 int in_len, char **out, int *out_len) 593{ 594 struct nls_table *nls = BEFS_SB(sb)->nls; 595 int i, o; 596 wchar_t uni; 597 int unilen, utflen; 598 char *result; 599 /* There're nls characters that will translate to 3-chars-wide UTF-8 600 * characters, a additional byte is needed to save the final \0 601 * in special cases */ 602 int maxlen = (3 * in_len) + 1; 603 604 befs_debug(sb, "---> nls2utf()\n"); 605 606 if (!nls) { 607 befs_error(sb, "befs_nls2utf called with no NLS table loaded."); 608 return -EINVAL; 609 } 610 611 *out = result = kmalloc(maxlen, GFP_NOFS); 612 if (!*out) { 613 befs_error(sb, "befs_nls2utf() cannot allocate memory"); 614 *out_len = 0; 615 return -ENOMEM; 616 } 617 618 for (i = o = 0; i < in_len; i += unilen, o += utflen) { 619 620 /* convert from nls to unicode */ 621 unilen = nls->char2uni(&in[i], in_len - i, &uni); 622 if (unilen < 0) 623 goto conv_err; 624 625 /* convert from unicode to UTF-8 */ 626 utflen = utf32_to_utf8(uni, &result[o], 3); 627 if (utflen <= 0) 628 goto conv_err; 629 } 630 631 result[o] = '\0'; 632 *out_len = o; 633 634 befs_debug(sb, "<--- nls2utf()"); 635 636 return i; 637 638 conv_err: 639 befs_error(sb, "Name using charecter set %s contains a charecter that " 640 "cannot be converted to unicode.", nls->charset); 641 befs_debug(sb, "<--- nls2utf()"); 642 kfree(result); 643 return -EILSEQ; 644} 645 646/** 647 * Use the 648 * 649 */ 650enum { 651 Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err, 652}; 653 654static const match_table_t befs_tokens = { 655 {Opt_uid, "uid=%d"}, 656 {Opt_gid, "gid=%d"}, 657 {Opt_charset, "iocharset=%s"}, 658 {Opt_debug, "debug"}, 659 {Opt_err, NULL} 660}; 661 662static int 663parse_options(char *options, befs_mount_options * opts) 664{ 665 char *p; 666 substring_t args[MAX_OPT_ARGS]; 667 int option; 668 669 /* Initialize options */ 670 opts->uid = 0; 671 opts->gid = 0; 672 opts->use_uid = 0; 673 opts->use_gid = 0; 674 opts->iocharset = NULL; 675 opts->debug = 0; 676 677 if (!options) 678 return 1; 679 680 while ((p = strsep(&options, ",")) != NULL) { 681 int token; 682 if (!*p) 683 continue; 684 685 token = match_token(p, befs_tokens, args); 686 switch (token) { 687 case Opt_uid: 688 if (match_int(&args[0], &option)) 689 return 0; 690 if (option < 0) { 691 printk(KERN_ERR "BeFS: Invalid uid %d, " 692 "using default\n", option); 693 break; 694 } 695 opts->uid = option; 696 opts->use_uid = 1; 697 break; 698 case Opt_gid: 699 if (match_int(&args[0], &option)) 700 return 0; 701 if (option < 0) { 702 printk(KERN_ERR "BeFS: Invalid gid %d, " 703 "using default\n", option); 704 break; 705 } 706 opts->gid = option; 707 opts->use_gid = 1; 708 break; 709 case Opt_charset: 710 kfree(opts->iocharset); 711 opts->iocharset = match_strdup(&args[0]); 712 if (!opts->iocharset) { 713 printk(KERN_ERR "BeFS: allocation failure for " 714 "iocharset string\n"); 715 return 0; 716 } 717 break; 718 case Opt_debug: 719 opts->debug = 1; 720 break; 721 default: 722 printk(KERN_ERR "BeFS: Unrecognized mount option \"%s\" " 723 "or missing value\n", p); 724 return 0; 725 } 726 } 727 return 1; 728} 729 730/* This function has the responsibiltiy of getting the 731 * filesystem ready for unmounting. 732 * Basicly, we free everything that we allocated in 733 * befs_read_inode 734 */ 735static void 736befs_put_super(struct super_block *sb) 737{ 738 kfree(BEFS_SB(sb)->mount_opts.iocharset); 739 BEFS_SB(sb)->mount_opts.iocharset = NULL; 740 unload_nls(BEFS_SB(sb)->nls); 741 kfree(sb->s_fs_info); 742 sb->s_fs_info = NULL; 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 */ 751static int 752befs_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 long ret = -EINVAL; 759 const unsigned long sb_block = 0; 760 const off_t x86_sb_off = 512; 761 762 save_mount_options(sb, data); 763 764 sb->s_fs_info = kmalloc(sizeof (*befs_sb), GFP_KERNEL); 765 if (sb->s_fs_info == NULL) { 766 printk(KERN_ERR 767 "BeFS(%s): Unable to allocate memory for private " 768 "portion of superblock. Bailing.\n", sb->s_id); 769 goto unacquire_none; 770 } 771 befs_sb = BEFS_SB(sb); 772 memset(befs_sb, 0, sizeof(befs_sb_info)); 773 774 if (!parse_options((char *) data, &befs_sb->mount_opts)) { 775 befs_error(sb, "cannot parse mount options"); 776 goto unacquire_priv_sbp; 777 } 778 779 befs_debug(sb, "---> befs_fill_super()"); 780 781#ifndef CONFIG_BEFS_RW 782 if (!(sb->s_flags & MS_RDONLY)) { 783 befs_warning(sb, 784 "No write support. Marking filesystem read-only"); 785 sb->s_flags |= MS_RDONLY; 786 } 787#endif /* CONFIG_BEFS_RW */ 788 789 /* 790 * Set dummy blocksize to read super block. 791 * Will be set to real fs blocksize later. 792 * 793 * Linux 2.4.10 and later refuse to read blocks smaller than 794 * the hardsect size for the device. But we also need to read at 795 * least 1k to get the second 512 bytes of the volume. 796 * -WD 10-26-01 797 */ 798 sb_min_blocksize(sb, 1024); 799 800 if (!(bh = sb_bread(sb, sb_block))) { 801 befs_error(sb, "unable to read superblock"); 802 goto unacquire_priv_sbp; 803 } 804 805 /* account for offset of super block on x86 */ 806 disk_sb = (befs_super_block *) bh->b_data; 807 if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) || 808 (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) { 809 befs_debug(sb, "Using PPC superblock location"); 810 } else { 811 befs_debug(sb, "Using x86 superblock location"); 812 disk_sb = 813 (befs_super_block *) ((void *) bh->b_data + x86_sb_off); 814 } 815 816 if (befs_load_sb(sb, disk_sb) != BEFS_OK) 817 goto unacquire_bh; 818 819 befs_dump_super_block(sb, disk_sb); 820 821 brelse(bh); 822 823 if (befs_check_sb(sb) != BEFS_OK) 824 goto unacquire_priv_sbp; 825 826 if( befs_sb->num_blocks > ~((sector_t)0) ) { 827 befs_error(sb, "blocks count: %Lu " 828 "is larger than the host can use", 829 befs_sb->num_blocks); 830 goto unacquire_priv_sbp; 831 } 832 833 /* 834 * set up enough so that it can read an inode 835 * Fill in kernel superblock fields from private sb 836 */ 837 sb->s_magic = BEFS_SUPER_MAGIC; 838 /* Set real blocksize of fs */ 839 sb_set_blocksize(sb, (ulong) befs_sb->block_size); 840 sb->s_op = &befs_sops; 841 root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir))); 842 if (IS_ERR(root)) { 843 ret = PTR_ERR(root); 844 goto unacquire_priv_sbp; 845 } 846 sb->s_root = d_alloc_root(root); 847 if (!sb->s_root) { 848 iput(root); 849 befs_error(sb, "get root inode failed"); 850 goto unacquire_priv_sbp; 851 } 852 853 /* load nls library */ 854 if (befs_sb->mount_opts.iocharset) { 855 befs_debug(sb, "Loading nls: %s", 856 befs_sb->mount_opts.iocharset); 857 befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset); 858 if (!befs_sb->nls) { 859 befs_warning(sb, "Cannot load nls %s" 860 " loading default nls", 861 befs_sb->mount_opts.iocharset); 862 befs_sb->nls = load_nls_default(); 863 } 864 /* load default nls if none is specified in mount options */ 865 } else { 866 befs_debug(sb, "Loading default nls"); 867 befs_sb->nls = load_nls_default(); 868 } 869 870 return 0; 871/*****************/ 872 unacquire_bh: 873 brelse(bh); 874 875 unacquire_priv_sbp: 876 kfree(befs_sb->mount_opts.iocharset); 877 kfree(sb->s_fs_info); 878 879 unacquire_none: 880 sb->s_fs_info = NULL; 881 return ret; 882} 883 884static int 885befs_remount(struct super_block *sb, int *flags, char *data) 886{ 887 if (!(*flags & MS_RDONLY)) 888 return -EINVAL; 889 return 0; 890} 891 892static int 893befs_statfs(struct dentry *dentry, struct kstatfs *buf) 894{ 895 struct super_block *sb = dentry->d_sb; 896 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 897 898 befs_debug(sb, "---> befs_statfs()"); 899 900 buf->f_type = BEFS_SUPER_MAGIC; 901 buf->f_bsize = sb->s_blocksize; 902 buf->f_blocks = BEFS_SB(sb)->num_blocks; 903 buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks; 904 buf->f_bavail = buf->f_bfree; 905 buf->f_files = 0; /* UNKNOWN */ 906 buf->f_ffree = 0; /* UNKNOWN */ 907 buf->f_fsid.val[0] = (u32)id; 908 buf->f_fsid.val[1] = (u32)(id >> 32); 909 buf->f_namelen = BEFS_NAME_LEN; 910 911 befs_debug(sb, "<--- befs_statfs()"); 912 913 return 0; 914} 915 916static int 917befs_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 924static 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 932static int __init 933init_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 949unacquire_inodecache: 950 befs_destroy_inodecache(); 951 952unacquire_none: 953 return err; 954} 955 956static void __exit 957exit_befs_fs(void) 958{ 959 befs_destroy_inodecache(); 960 961 unregister_filesystem(&befs_fs_type); 962} 963 964/* 965Macros that typecheck the init and exit functions, 966ensures that they are called at init and cleanup, 967and eliminates warnings about unused functions. 968*/ 969module_init(init_befs_fs) 970module_exit(exit_befs_fs) 971