1/* 2 * linux/fs/befs/linuxvfs.c 3 * 4 * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com 5 * 6 */ 7 8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10#include <linux/module.h> 11#include <linux/slab.h> 12#include <linux/fs.h> 13#include <linux/errno.h> 14#include <linux/stat.h> 15#include <linux/nls.h> 16#include <linux/buffer_head.h> 17#include <linux/vfs.h> 18#include <linux/parser.h> 19#include <linux/namei.h> 20#include <linux/sched.h> 21 22#include "befs.h" 23#include "btree.h" 24#include "inode.h" 25#include "datastream.h" 26#include "super.h" 27#include "io.h" 28 29MODULE_DESCRIPTION("BeOS File System (BeFS) driver"); 30MODULE_AUTHOR("Will Dyson"); 31MODULE_LICENSE("GPL"); 32 33/* The units the vfs expects inode->i_blocks to be in */ 34#define VFS_BLOCK_SIZE 512 35 36static int befs_readdir(struct file *, struct dir_context *); 37static int befs_get_block(struct inode *, sector_t, struct buffer_head *, int); 38static int befs_readpage(struct file *file, struct page *page); 39static sector_t befs_bmap(struct address_space *mapping, sector_t block); 40static struct dentry *befs_lookup(struct inode *, struct dentry *, unsigned int); 41static struct inode *befs_iget(struct super_block *, unsigned long); 42static struct inode *befs_alloc_inode(struct super_block *sb); 43static void befs_destroy_inode(struct inode *inode); 44static void befs_destroy_inodecache(void); 45static void *befs_follow_link(struct dentry *, struct nameidata *); 46static void *befs_fast_follow_link(struct dentry *, struct nameidata *); 47static int befs_utf2nls(struct super_block *sb, const char *in, int in_len, 48 char **out, int *out_len); 49static int befs_nls2utf(struct super_block *sb, const char *in, int in_len, 50 char **out, int *out_len); 51static void befs_put_super(struct super_block *); 52static int befs_remount(struct super_block *, int *, char *); 53static int befs_statfs(struct dentry *, struct kstatfs *); 54static int parse_options(char *, struct befs_mount_options *); 55 56static const struct super_operations befs_sops = { 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 .show_options = generic_show_options, 63}; 64 65/* slab cache for befs_inode_info objects */ 66static struct kmem_cache *befs_inode_cachep; 67 68static const struct file_operations befs_dir_operations = { 69 .read = generic_read_dir, 70 .iterate = befs_readdir, 71 .llseek = generic_file_llseek, 72}; 73 74static const struct inode_operations befs_dir_inode_operations = { 75 .lookup = befs_lookup, 76}; 77 78static const struct address_space_operations befs_aops = { 79 .readpage = befs_readpage, 80 .bmap = befs_bmap, 81}; 82 83static const struct inode_operations befs_fast_symlink_inode_operations = { 84 .readlink = generic_readlink, 85 .follow_link = befs_fast_follow_link, 86}; 87 88static const struct inode_operations befs_symlink_inode_operations = { 89 .readlink = generic_readlink, 90 .follow_link = befs_follow_link, 91 .put_link = kfree_put_link, 92}; 93 94/* 95 * Called by generic_file_read() to read a page of data 96 * 97 * In turn, simply calls a generic block read function and 98 * passes it the address of befs_get_block, for mapping file 99 * positions to disk blocks. 100 */ 101static int 102befs_readpage(struct file *file, struct page *page) 103{ 104 return block_read_full_page(page, befs_get_block); 105} 106 107static sector_t 108befs_bmap(struct address_space *mapping, sector_t block) 109{ 110 return generic_block_bmap(mapping, block, befs_get_block); 111} 112 113/* 114 * Generic function to map a file position (block) to a 115 * disk offset (passed back in bh_result). 116 * 117 * Used by many higher level functions. 118 * 119 * Calls befs_fblock2brun() in datastream.c to do the real work. 120 * 121 * -WD 10-26-01 122 */ 123 124static int 125befs_get_block(struct inode *inode, sector_t block, 126 struct buffer_head *bh_result, int create) 127{ 128 struct super_block *sb = inode->i_sb; 129 befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; 130 befs_block_run run = BAD_IADDR; 131 int res = 0; 132 ulong disk_off; 133 134 befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld", 135 (unsigned long)inode->i_ino, (long)block); 136 if (create) { 137 befs_error(sb, "befs_get_block() was asked to write to " 138 "block %ld in inode %lu", (long)block, 139 (unsigned long)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 "<--- %s for inode %lu, block %ld ERROR", 147 __func__, (unsigned long)inode->i_ino, 148 (long)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, "<--- %s for inode %lu, block %ld, disk address %lu", 157 __func__, (unsigned long)inode->i_ino, (long)block, 158 (unsigned long)disk_off); 159 160 return 0; 161} 162 163static struct dentry * 164befs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) 165{ 166 struct inode *inode = NULL; 167 struct super_block *sb = dir->i_sb; 168 befs_data_stream *ds = &BEFS_I(dir)->i_data.ds; 169 befs_off_t offset; 170 int ret; 171 int utfnamelen; 172 char *utfname; 173 const char *name = dentry->d_name.name; 174 175 befs_debug(sb, "---> %s name %pd inode %ld", __func__, 176 dentry, dir->i_ino); 177 178 /* Convert to UTF-8 */ 179 if (BEFS_SB(sb)->nls) { 180 ret = 181 befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen); 182 if (ret < 0) { 183 befs_debug(sb, "<--- %s ERROR", __func__); 184 return ERR_PTR(ret); 185 } 186 ret = befs_btree_find(sb, ds, utfname, &offset); 187 kfree(utfname); 188 189 } else { 190 ret = befs_btree_find(sb, ds, dentry->d_name.name, &offset); 191 } 192 193 if (ret == BEFS_BT_NOT_FOUND) { 194 befs_debug(sb, "<--- %s %pd not found", __func__, dentry); 195 return ERR_PTR(-ENOENT); 196 197 } else if (ret != BEFS_OK || offset == 0) { 198 befs_warning(sb, "<--- %s Error", __func__); 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, "<--- %s", __func__); 209 210 return NULL; 211} 212 213static int 214befs_readdir(struct file *file, struct dir_context *ctx) 215{ 216 struct inode *inode = file_inode(file); 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]; 224 225 befs_debug(sb, "---> %s name %pD, inode %ld, ctx->pos %lld", 226 __func__, file, inode->i_ino, ctx->pos); 227 228more: 229 result = befs_btree_read(sb, ds, ctx->pos, BEFS_NAME_LEN + 1, 230 keybuf, &keysize, &value); 231 232 if (result == BEFS_ERR) { 233 befs_debug(sb, "<--- %s ERROR", __func__); 234 befs_error(sb, "IO error reading %pD (inode %lu)", 235 file, inode->i_ino); 236 return -EIO; 237 238 } else if (result == BEFS_BT_END) { 239 befs_debug(sb, "<--- %s END", __func__); 240 return 0; 241 242 } else if (result == BEFS_BT_EMPTY) { 243 befs_debug(sb, "<--- %s Empty directory", __func__); 244 return 0; 245 } 246 247 d_type = DT_UNKNOWN; 248 249 /* Convert to NLS */ 250 if (BEFS_SB(sb)->nls) { 251 char *nlsname; 252 int nlsnamelen; 253 result = 254 befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen); 255 if (result < 0) { 256 befs_debug(sb, "<--- %s ERROR", __func__); 257 return result; 258 } 259 if (!dir_emit(ctx, nlsname, nlsnamelen, 260 (ino_t) value, d_type)) { 261 kfree(nlsname); 262 return 0; 263 } 264 kfree(nlsname); 265 } else { 266 if (!dir_emit(ctx, keybuf, keysize, 267 (ino_t) value, d_type)) 268 return 0; 269 } 270 ctx->pos++; 271 goto more; 272} 273 274static struct inode * 275befs_alloc_inode(struct super_block *sb) 276{ 277 struct befs_inode_info *bi; 278 279 bi = kmem_cache_alloc(befs_inode_cachep, GFP_KERNEL); 280 if (!bi) 281 return NULL; 282 return &bi->vfs_inode; 283} 284 285static void befs_i_callback(struct rcu_head *head) 286{ 287 struct inode *inode = container_of(head, struct inode, i_rcu); 288 kmem_cache_free(befs_inode_cachep, BEFS_I(inode)); 289} 290 291static void befs_destroy_inode(struct inode *inode) 292{ 293 call_rcu(&inode->i_rcu, befs_i_callback); 294} 295 296static void init_once(void *foo) 297{ 298 struct befs_inode_info *bi = (struct befs_inode_info *) foo; 299 300 inode_init_once(&bi->vfs_inode); 301} 302 303static struct inode *befs_iget(struct super_block *sb, unsigned long ino) 304{ 305 struct buffer_head *bh = NULL; 306 befs_inode *raw_inode = NULL; 307 struct befs_sb_info *befs_sb = BEFS_SB(sb); 308 struct befs_inode_info *befs_ino = NULL; 309 struct inode *inode; 310 long ret = -EIO; 311 312 befs_debug(sb, "---> %s inode = %lu", __func__, ino); 313 314 inode = iget_locked(sb, ino); 315 if (!inode) 316 return ERR_PTR(-ENOMEM); 317 if (!(inode->i_state & I_NEW)) 318 return inode; 319 320 befs_ino = BEFS_I(inode); 321 322 /* convert from vfs's inode number to befs's inode number */ 323 befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino); 324 325 befs_debug(sb, " real inode number [%u, %hu, %hu]", 326 befs_ino->i_inode_num.allocation_group, 327 befs_ino->i_inode_num.start, befs_ino->i_inode_num.len); 328 329 bh = befs_bread(sb, inode->i_ino); 330 if (!bh) { 331 befs_error(sb, "unable to read inode block - " 332 "inode = %lu", inode->i_ino); 333 goto unacquire_none; 334 } 335 336 raw_inode = (befs_inode *) bh->b_data; 337 338 befs_dump_inode(sb, raw_inode); 339 340 if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) { 341 befs_error(sb, "Bad inode: %lu", inode->i_ino); 342 goto unacquire_bh; 343 } 344 345 inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode); 346 347 /* 348 * set uid and gid. But since current BeOS is single user OS, so 349 * you can change by "uid" or "gid" options. 350 */ 351 352 inode->i_uid = befs_sb->mount_opts.use_uid ? 353 befs_sb->mount_opts.uid : 354 make_kuid(&init_user_ns, fs32_to_cpu(sb, raw_inode->uid)); 355 inode->i_gid = befs_sb->mount_opts.use_gid ? 356 befs_sb->mount_opts.gid : 357 make_kgid(&init_user_ns, fs32_to_cpu(sb, raw_inode->gid)); 358 359 set_nlink(inode, 1); 360 361 /* 362 * BEFS's time is 64 bits, but current VFS is 32 bits... 363 * BEFS don't have access time. Nor inode change time. VFS 364 * doesn't have creation time. 365 * Also, the lower 16 bits of the last_modified_time and 366 * create_time are just a counter to help ensure uniqueness 367 * for indexing purposes. (PFD, page 54) 368 */ 369 370 inode->i_mtime.tv_sec = 371 fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16; 372 inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */ 373 inode->i_ctime = inode->i_mtime; 374 inode->i_atime = inode->i_mtime; 375 376 befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num); 377 befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent); 378 befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes); 379 befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags); 380 381 if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){ 382 inode->i_size = 0; 383 inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE; 384 strlcpy(befs_ino->i_data.symlink, raw_inode->data.symlink, 385 BEFS_SYMLINK_LEN); 386 } else { 387 int num_blks; 388 389 befs_ino->i_data.ds = 390 fsds_to_cpu(sb, &raw_inode->data.datastream); 391 392 num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds); 393 inode->i_blocks = 394 num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE); 395 inode->i_size = befs_ino->i_data.ds.size; 396 } 397 398 inode->i_mapping->a_ops = &befs_aops; 399 400 if (S_ISREG(inode->i_mode)) { 401 inode->i_fop = &generic_ro_fops; 402 } else if (S_ISDIR(inode->i_mode)) { 403 inode->i_op = &befs_dir_inode_operations; 404 inode->i_fop = &befs_dir_operations; 405 } else if (S_ISLNK(inode->i_mode)) { 406 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) 407 inode->i_op = &befs_symlink_inode_operations; 408 else 409 inode->i_op = &befs_fast_symlink_inode_operations; 410 } else { 411 befs_error(sb, "Inode %lu is not a regular file, " 412 "directory or symlink. THAT IS WRONG! BeFS has no " 413 "on disk special files", inode->i_ino); 414 goto unacquire_bh; 415 } 416 417 brelse(bh); 418 befs_debug(sb, "<--- %s", __func__); 419 unlock_new_inode(inode); 420 return inode; 421 422 unacquire_bh: 423 brelse(bh); 424 425 unacquire_none: 426 iget_failed(inode); 427 befs_debug(sb, "<--- %s - Bad inode", __func__); 428 return ERR_PTR(ret); 429} 430 431/* Initialize the inode cache. Called at fs setup. 432 * 433 * Taken from NFS implementation by Al Viro. 434 */ 435static int __init 436befs_init_inodecache(void) 437{ 438 befs_inode_cachep = kmem_cache_create("befs_inode_cache", 439 sizeof (struct befs_inode_info), 440 0, (SLAB_RECLAIM_ACCOUNT| 441 SLAB_MEM_SPREAD), 442 init_once); 443 if (befs_inode_cachep == NULL) { 444 pr_err("%s: Couldn't initialize inode slabcache\n", __func__); 445 return -ENOMEM; 446 } 447 return 0; 448} 449 450/* Called at fs teardown. 451 * 452 * Taken from NFS implementation by Al Viro. 453 */ 454static void 455befs_destroy_inodecache(void) 456{ 457 /* 458 * Make sure all delayed rcu free inodes are flushed before we 459 * destroy cache. 460 */ 461 rcu_barrier(); 462 kmem_cache_destroy(befs_inode_cachep); 463} 464 465/* 466 * The inode of symbolic link is different to data stream. 467 * The data stream become link name. Unless the LONG_SYMLINK 468 * flag is set. 469 */ 470static void * 471befs_follow_link(struct dentry *dentry, struct nameidata *nd) 472{ 473 struct super_block *sb = dentry->d_sb; 474 struct befs_inode_info *befs_ino = BEFS_I(d_inode(dentry)); 475 befs_data_stream *data = &befs_ino->i_data.ds; 476 befs_off_t len = data->size; 477 char *link; 478 479 if (len == 0) { 480 befs_error(sb, "Long symlink with illegal length"); 481 link = ERR_PTR(-EIO); 482 } else { 483 befs_debug(sb, "Follow long symlink"); 484 485 link = kmalloc(len, GFP_NOFS); 486 if (!link) { 487 link = ERR_PTR(-ENOMEM); 488 } else if (befs_read_lsymlink(sb, data, link, len) != len) { 489 kfree(link); 490 befs_error(sb, "Failed to read entire long symlink"); 491 link = ERR_PTR(-EIO); 492 } else { 493 link[len - 1] = '\0'; 494 } 495 } 496 nd_set_link(nd, link); 497 return NULL; 498} 499 500 501static void * 502befs_fast_follow_link(struct dentry *dentry, struct nameidata *nd) 503{ 504 struct befs_inode_info *befs_ino = BEFS_I(d_inode(dentry)); 505 506 nd_set_link(nd, befs_ino->i_data.symlink); 507 return NULL; 508} 509 510/* 511 * UTF-8 to NLS charset convert routine 512 * 513 * 514 * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than 515 * the nls tables directly 516 */ 517 518static int 519befs_utf2nls(struct super_block *sb, const char *in, 520 int in_len, char **out, int *out_len) 521{ 522 struct nls_table *nls = BEFS_SB(sb)->nls; 523 int i, o; 524 unicode_t uni; 525 int unilen, utflen; 526 char *result; 527 /* The utf8->nls conversion won't make the final nls string bigger 528 * than the utf one, but if the string is pure ascii they'll have the 529 * same width and an extra char is needed to save the additional \0 530 */ 531 int maxlen = in_len + 1; 532 533 befs_debug(sb, "---> %s", __func__); 534 535 if (!nls) { 536 befs_error(sb, "%s called with no NLS table loaded", __func__); 537 return -EINVAL; 538 } 539 540 *out = result = kmalloc(maxlen, GFP_NOFS); 541 if (!*out) { 542 befs_error(sb, "%s cannot allocate memory", __func__); 543 *out_len = 0; 544 return -ENOMEM; 545 } 546 547 for (i = o = 0; i < in_len; i += utflen, o += unilen) { 548 549 /* convert from UTF-8 to Unicode */ 550 utflen = utf8_to_utf32(&in[i], in_len - i, &uni); 551 if (utflen < 0) 552 goto conv_err; 553 554 /* convert from Unicode to nls */ 555 if (uni > MAX_WCHAR_T) 556 goto conv_err; 557 unilen = nls->uni2char(uni, &result[o], in_len - o); 558 if (unilen < 0) 559 goto conv_err; 560 } 561 result[o] = '\0'; 562 *out_len = o; 563 564 befs_debug(sb, "<--- %s", __func__); 565 566 return o; 567 568 conv_err: 569 befs_error(sb, "Name using character set %s contains a character that " 570 "cannot be converted to unicode.", nls->charset); 571 befs_debug(sb, "<--- %s", __func__); 572 kfree(result); 573 return -EILSEQ; 574} 575 576/** 577 * befs_nls2utf - Convert NLS string to utf8 encodeing 578 * @sb: Superblock 579 * @in: Input string buffer in NLS format 580 * @in_len: Length of input string in bytes 581 * @out: The output string in UTF-8 format 582 * @out_len: Length of the output buffer 583 * 584 * Converts input string @in, which is in the format of the loaded NLS map, 585 * into a utf8 string. 586 * 587 * The destination string @out is allocated by this function and the caller is 588 * responsible for freeing it with kfree() 589 * 590 * On return, *@out_len is the length of @out in bytes. 591 * 592 * On success, the return value is the number of utf8 characters written to 593 * the output buffer @out. 594 * 595 * On Failure, a negative number coresponding to the error code is returned. 596 */ 597 598static int 599befs_nls2utf(struct super_block *sb, const char *in, 600 int in_len, char **out, int *out_len) 601{ 602 struct nls_table *nls = BEFS_SB(sb)->nls; 603 int i, o; 604 wchar_t uni; 605 int unilen, utflen; 606 char *result; 607 /* There're nls characters that will translate to 3-chars-wide UTF-8 608 * characters, a additional byte is needed to save the final \0 609 * in special cases */ 610 int maxlen = (3 * in_len) + 1; 611 612 befs_debug(sb, "---> %s\n", __func__); 613 614 if (!nls) { 615 befs_error(sb, "%s called with no NLS table loaded.", 616 __func__); 617 return -EINVAL; 618 } 619 620 *out = result = kmalloc(maxlen, GFP_NOFS); 621 if (!*out) { 622 befs_error(sb, "%s cannot allocate memory", __func__); 623 *out_len = 0; 624 return -ENOMEM; 625 } 626 627 for (i = o = 0; i < in_len; i += unilen, o += utflen) { 628 629 /* convert from nls to unicode */ 630 unilen = nls->char2uni(&in[i], in_len - i, &uni); 631 if (unilen < 0) 632 goto conv_err; 633 634 /* convert from unicode to UTF-8 */ 635 utflen = utf32_to_utf8(uni, &result[o], 3); 636 if (utflen <= 0) 637 goto conv_err; 638 } 639 640 result[o] = '\0'; 641 *out_len = o; 642 643 befs_debug(sb, "<--- %s", __func__); 644 645 return i; 646 647 conv_err: 648 befs_error(sb, "Name using charecter set %s contains a charecter that " 649 "cannot be converted to unicode.", nls->charset); 650 befs_debug(sb, "<--- %s", __func__); 651 kfree(result); 652 return -EILSEQ; 653} 654 655/** 656 * Use the 657 * 658 */ 659enum { 660 Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err, 661}; 662 663static const match_table_t befs_tokens = { 664 {Opt_uid, "uid=%d"}, 665 {Opt_gid, "gid=%d"}, 666 {Opt_charset, "iocharset=%s"}, 667 {Opt_debug, "debug"}, 668 {Opt_err, NULL} 669}; 670 671static int 672parse_options(char *options, struct befs_mount_options *opts) 673{ 674 char *p; 675 substring_t args[MAX_OPT_ARGS]; 676 int option; 677 kuid_t uid; 678 kgid_t gid; 679 680 /* Initialize options */ 681 opts->uid = GLOBAL_ROOT_UID; 682 opts->gid = GLOBAL_ROOT_GID; 683 opts->use_uid = 0; 684 opts->use_gid = 0; 685 opts->iocharset = NULL; 686 opts->debug = 0; 687 688 if (!options) 689 return 1; 690 691 while ((p = strsep(&options, ",")) != NULL) { 692 int token; 693 if (!*p) 694 continue; 695 696 token = match_token(p, befs_tokens, args); 697 switch (token) { 698 case Opt_uid: 699 if (match_int(&args[0], &option)) 700 return 0; 701 uid = INVALID_UID; 702 if (option >= 0) 703 uid = make_kuid(current_user_ns(), option); 704 if (!uid_valid(uid)) { 705 pr_err("Invalid uid %d, " 706 "using default\n", option); 707 break; 708 } 709 opts->uid = uid; 710 opts->use_uid = 1; 711 break; 712 case Opt_gid: 713 if (match_int(&args[0], &option)) 714 return 0; 715 gid = INVALID_GID; 716 if (option >= 0) 717 gid = make_kgid(current_user_ns(), option); 718 if (!gid_valid(gid)) { 719 pr_err("Invalid gid %d, " 720 "using default\n", option); 721 break; 722 } 723 opts->gid = gid; 724 opts->use_gid = 1; 725 break; 726 case Opt_charset: 727 kfree(opts->iocharset); 728 opts->iocharset = match_strdup(&args[0]); 729 if (!opts->iocharset) { 730 pr_err("allocation failure for " 731 "iocharset string\n"); 732 return 0; 733 } 734 break; 735 case Opt_debug: 736 opts->debug = 1; 737 break; 738 default: 739 pr_err("Unrecognized mount option \"%s\" " 740 "or missing value\n", p); 741 return 0; 742 } 743 } 744 return 1; 745} 746 747/* This function has the responsibiltiy of getting the 748 * filesystem ready for unmounting. 749 * Basically, we free everything that we allocated in 750 * befs_read_inode 751 */ 752static void 753befs_put_super(struct super_block *sb) 754{ 755 kfree(BEFS_SB(sb)->mount_opts.iocharset); 756 BEFS_SB(sb)->mount_opts.iocharset = NULL; 757 unload_nls(BEFS_SB(sb)->nls); 758 kfree(sb->s_fs_info); 759 sb->s_fs_info = NULL; 760} 761 762/* Allocate private field of the superblock, fill it. 763 * 764 * Finish filling the public superblock fields 765 * Make the root directory 766 * Load a set of NLS translations if needed. 767 */ 768static int 769befs_fill_super(struct super_block *sb, void *data, int silent) 770{ 771 struct buffer_head *bh; 772 struct befs_sb_info *befs_sb; 773 befs_super_block *disk_sb; 774 struct inode *root; 775 long ret = -EINVAL; 776 const unsigned long sb_block = 0; 777 const off_t x86_sb_off = 512; 778 779 save_mount_options(sb, data); 780 781 sb->s_fs_info = kzalloc(sizeof(*befs_sb), GFP_KERNEL); 782 if (sb->s_fs_info == NULL) { 783 pr_err("(%s): Unable to allocate memory for private " 784 "portion of superblock. Bailing.\n", sb->s_id); 785 goto unacquire_none; 786 } 787 befs_sb = BEFS_SB(sb); 788 789 if (!parse_options((char *) data, &befs_sb->mount_opts)) { 790 befs_error(sb, "cannot parse mount options"); 791 goto unacquire_priv_sbp; 792 } 793 794 befs_debug(sb, "---> %s", __func__); 795 796 if (!(sb->s_flags & MS_RDONLY)) { 797 befs_warning(sb, 798 "No write support. Marking filesystem read-only"); 799 sb->s_flags |= MS_RDONLY; 800 } 801 802 /* 803 * Set dummy blocksize to read super block. 804 * Will be set to real fs blocksize later. 805 * 806 * Linux 2.4.10 and later refuse to read blocks smaller than 807 * the hardsect size for the device. But we also need to read at 808 * least 1k to get the second 512 bytes of the volume. 809 * -WD 10-26-01 810 */ 811 sb_min_blocksize(sb, 1024); 812 813 if (!(bh = sb_bread(sb, sb_block))) { 814 befs_error(sb, "unable to read superblock"); 815 goto unacquire_priv_sbp; 816 } 817 818 /* account for offset of super block on x86 */ 819 disk_sb = (befs_super_block *) bh->b_data; 820 if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) || 821 (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) { 822 befs_debug(sb, "Using PPC superblock location"); 823 } else { 824 befs_debug(sb, "Using x86 superblock location"); 825 disk_sb = 826 (befs_super_block *) ((void *) bh->b_data + x86_sb_off); 827 } 828 829 if ((befs_load_sb(sb, disk_sb) != BEFS_OK) || 830 (befs_check_sb(sb) != BEFS_OK)) 831 goto unacquire_bh; 832 833 befs_dump_super_block(sb, disk_sb); 834 835 brelse(bh); 836 837 if( befs_sb->num_blocks > ~((sector_t)0) ) { 838 befs_error(sb, "blocks count: %llu " 839 "is larger than the host can use", 840 befs_sb->num_blocks); 841 goto unacquire_priv_sbp; 842 } 843 844 /* 845 * set up enough so that it can read an inode 846 * Fill in kernel superblock fields from private sb 847 */ 848 sb->s_magic = BEFS_SUPER_MAGIC; 849 /* Set real blocksize of fs */ 850 sb_set_blocksize(sb, (ulong) befs_sb->block_size); 851 sb->s_op = &befs_sops; 852 root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir))); 853 if (IS_ERR(root)) { 854 ret = PTR_ERR(root); 855 goto unacquire_priv_sbp; 856 } 857 sb->s_root = d_make_root(root); 858 if (!sb->s_root) { 859 befs_error(sb, "get root inode failed"); 860 goto unacquire_priv_sbp; 861 } 862 863 /* load nls library */ 864 if (befs_sb->mount_opts.iocharset) { 865 befs_debug(sb, "Loading nls: %s", 866 befs_sb->mount_opts.iocharset); 867 befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset); 868 if (!befs_sb->nls) { 869 befs_warning(sb, "Cannot load nls %s" 870 " loading default nls", 871 befs_sb->mount_opts.iocharset); 872 befs_sb->nls = load_nls_default(); 873 } 874 /* load default nls if none is specified in mount options */ 875 } else { 876 befs_debug(sb, "Loading default nls"); 877 befs_sb->nls = load_nls_default(); 878 } 879 880 return 0; 881/*****************/ 882 unacquire_bh: 883 brelse(bh); 884 885 unacquire_priv_sbp: 886 kfree(befs_sb->mount_opts.iocharset); 887 kfree(sb->s_fs_info); 888 889 unacquire_none: 890 sb->s_fs_info = NULL; 891 return ret; 892} 893 894static int 895befs_remount(struct super_block *sb, int *flags, char *data) 896{ 897 sync_filesystem(sb); 898 if (!(*flags & MS_RDONLY)) 899 return -EINVAL; 900 return 0; 901} 902 903static int 904befs_statfs(struct dentry *dentry, struct kstatfs *buf) 905{ 906 struct super_block *sb = dentry->d_sb; 907 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 908 909 befs_debug(sb, "---> %s", __func__); 910 911 buf->f_type = BEFS_SUPER_MAGIC; 912 buf->f_bsize = sb->s_blocksize; 913 buf->f_blocks = BEFS_SB(sb)->num_blocks; 914 buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks; 915 buf->f_bavail = buf->f_bfree; 916 buf->f_files = 0; /* UNKNOWN */ 917 buf->f_ffree = 0; /* UNKNOWN */ 918 buf->f_fsid.val[0] = (u32)id; 919 buf->f_fsid.val[1] = (u32)(id >> 32); 920 buf->f_namelen = BEFS_NAME_LEN; 921 922 befs_debug(sb, "<--- %s", __func__); 923 924 return 0; 925} 926 927static struct dentry * 928befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, 929 void *data) 930{ 931 return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super); 932} 933 934static struct file_system_type befs_fs_type = { 935 .owner = THIS_MODULE, 936 .name = "befs", 937 .mount = befs_mount, 938 .kill_sb = kill_block_super, 939 .fs_flags = FS_REQUIRES_DEV, 940}; 941MODULE_ALIAS_FS("befs"); 942 943static int __init 944init_befs_fs(void) 945{ 946 int err; 947 948 pr_info("version: %s\n", BEFS_VERSION); 949 950 err = befs_init_inodecache(); 951 if (err) 952 goto unacquire_none; 953 954 err = register_filesystem(&befs_fs_type); 955 if (err) 956 goto unacquire_inodecache; 957 958 return 0; 959 960unacquire_inodecache: 961 befs_destroy_inodecache(); 962 963unacquire_none: 964 return err; 965} 966 967static void __exit 968exit_befs_fs(void) 969{ 970 befs_destroy_inodecache(); 971 972 unregister_filesystem(&befs_fs_type); 973} 974 975/* 976Macros that typecheck the init and exit functions, 977ensures that they are called at init and cleanup, 978and eliminates warnings about unused functions. 979*/ 980module_init(init_befs_fs) 981module_exit(exit_befs_fs) 982