2 * linux/fs/befs/linuxvfs.c
4 * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10 #include <linux/module.h>
11 #include <linux/slab.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>
25 #include "datastream.h"
29 MODULE_DESCRIPTION("BeOS File System (BeFS) driver");
30 MODULE_AUTHOR("Will Dyson");
31 MODULE_LICENSE("GPL");
33 /* The units the vfs expects inode->i_blocks to be in */
34 #define VFS_BLOCK_SIZE 512
36 static int befs_readdir(struct file *, struct dir_context *);
37 static int befs_get_block(struct inode *, sector_t, struct buffer_head *, int);
38 static int befs_readpage(struct file *file, struct page *page);
39 static sector_t befs_bmap(struct address_space *mapping, sector_t block);
40 static struct dentry *befs_lookup(struct inode *, struct dentry *, unsigned int);
41 static struct inode *befs_iget(struct super_block *, unsigned long);
42 static struct inode *befs_alloc_inode(struct super_block *sb);
43 static void befs_destroy_inode(struct inode *inode);
44 static void befs_destroy_inodecache(void);
45 static int befs_symlink_readpage(struct file *, struct page *);
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 dentry *, struct kstatfs *);
53 static int parse_options(char *, struct befs_mount_options *);
55 static const struct super_operations befs_sops = {
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 .show_options = generic_show_options,
64 /* slab cache for befs_inode_info objects */
65 static struct kmem_cache *befs_inode_cachep;
67 static const struct file_operations befs_dir_operations = {
68 .read = generic_read_dir,
69 .iterate_shared = befs_readdir,
70 .llseek = generic_file_llseek,
73 static const struct inode_operations befs_dir_inode_operations = {
74 .lookup = befs_lookup,
77 static const struct address_space_operations befs_aops = {
78 .readpage = befs_readpage,
82 static const struct address_space_operations befs_symlink_aops = {
83 .readpage = befs_symlink_readpage,
87 * Called by generic_file_read() to read a page of data
89 * In turn, simply calls a generic block read function and
90 * passes it the address of befs_get_block, for mapping file
91 * positions to disk blocks.
94 befs_readpage(struct file *file, struct page *page)
96 return block_read_full_page(page, befs_get_block);
100 befs_bmap(struct address_space *mapping, sector_t block)
102 return generic_block_bmap(mapping, block, befs_get_block);
106 * Generic function to map a file position (block) to a
107 * disk offset (passed back in bh_result).
109 * Used by many higher level functions.
111 * Calls befs_fblock2brun() in datastream.c to do the real work.
117 befs_get_block(struct inode *inode, sector_t block,
118 struct buffer_head *bh_result, int create)
120 struct super_block *sb = inode->i_sb;
121 befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
122 befs_block_run run = BAD_IADDR;
126 befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld",
127 (unsigned long)inode->i_ino, (long)block);
129 befs_error(sb, "befs_get_block() was asked to write to "
130 "block %ld in inode %lu", (long)block,
131 (unsigned long)inode->i_ino);
135 res = befs_fblock2brun(sb, ds, block, &run);
136 if (res != BEFS_OK) {
138 "<--- %s for inode %lu, block %ld ERROR",
139 __func__, (unsigned long)inode->i_ino,
144 disk_off = (ulong) iaddr2blockno(sb, &run);
146 map_bh(bh_result, inode->i_sb, disk_off);
148 befs_debug(sb, "<--- %s for inode %lu, block %ld, disk address %lu",
149 __func__, (unsigned long)inode->i_ino, (long)block,
150 (unsigned long)disk_off);
155 static struct dentry *
156 befs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
159 struct super_block *sb = dir->i_sb;
160 const befs_data_stream *ds = &BEFS_I(dir)->i_data.ds;
165 const char *name = dentry->d_name.name;
167 befs_debug(sb, "---> %s name %pd inode %ld", __func__,
170 /* Convert to UTF-8 */
171 if (BEFS_SB(sb)->nls) {
173 befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen);
175 befs_debug(sb, "<--- %s ERROR", __func__);
178 ret = befs_btree_find(sb, ds, utfname, &offset);
182 ret = befs_btree_find(sb, ds, name, &offset);
185 if (ret == BEFS_BT_NOT_FOUND) {
186 befs_debug(sb, "<--- %s %pd not found", __func__, dentry);
188 return ERR_PTR(-ENOENT);
190 } else if (ret != BEFS_OK || offset == 0) {
191 befs_error(sb, "<--- %s Error", __func__);
192 return ERR_PTR(-ENODATA);
195 inode = befs_iget(dir->i_sb, (ino_t) offset);
197 return ERR_CAST(inode);
199 d_add(dentry, inode);
201 befs_debug(sb, "<--- %s", __func__);
207 befs_readdir(struct file *file, struct dir_context *ctx)
209 struct inode *inode = file_inode(file);
210 struct super_block *sb = inode->i_sb;
211 const befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
215 char keybuf[BEFS_NAME_LEN + 1];
217 befs_debug(sb, "---> %s name %pD, inode %ld, ctx->pos %lld",
218 __func__, file, inode->i_ino, ctx->pos);
221 result = befs_btree_read(sb, ds, ctx->pos, BEFS_NAME_LEN + 1,
222 keybuf, &keysize, &value);
224 if (result == BEFS_ERR) {
225 befs_debug(sb, "<--- %s ERROR", __func__);
226 befs_error(sb, "IO error reading %pD (inode %lu)",
230 } else if (result == BEFS_BT_END) {
231 befs_debug(sb, "<--- %s END", __func__);
234 } else if (result == BEFS_BT_EMPTY) {
235 befs_debug(sb, "<--- %s Empty directory", __func__);
240 if (BEFS_SB(sb)->nls) {
245 befs_utf2nls(sb, keybuf, keysize, &nlsname,
248 befs_debug(sb, "<--- %s ERROR", __func__);
251 if (!dir_emit(ctx, nlsname, nlsnamelen,
252 (ino_t) value, DT_UNKNOWN)) {
258 if (!dir_emit(ctx, keybuf, keysize,
259 (ino_t) value, DT_UNKNOWN))
266 static struct inode *
267 befs_alloc_inode(struct super_block *sb)
269 struct befs_inode_info *bi;
271 bi = kmem_cache_alloc(befs_inode_cachep, GFP_KERNEL);
274 return &bi->vfs_inode;
277 static void befs_i_callback(struct rcu_head *head)
279 struct inode *inode = container_of(head, struct inode, i_rcu);
280 kmem_cache_free(befs_inode_cachep, BEFS_I(inode));
283 static void befs_destroy_inode(struct inode *inode)
285 call_rcu(&inode->i_rcu, befs_i_callback);
288 static void init_once(void *foo)
290 struct befs_inode_info *bi = (struct befs_inode_info *) foo;
292 inode_init_once(&bi->vfs_inode);
295 static struct inode *befs_iget(struct super_block *sb, unsigned long ino)
297 struct buffer_head *bh;
298 befs_inode *raw_inode;
299 struct befs_sb_info *befs_sb = BEFS_SB(sb);
300 struct befs_inode_info *befs_ino;
303 befs_debug(sb, "---> %s inode = %lu", __func__, ino);
305 inode = iget_locked(sb, ino);
307 return ERR_PTR(-ENOMEM);
308 if (!(inode->i_state & I_NEW))
311 befs_ino = BEFS_I(inode);
313 /* convert from vfs's inode number to befs's inode number */
314 befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino);
316 befs_debug(sb, " real inode number [%u, %hu, %hu]",
317 befs_ino->i_inode_num.allocation_group,
318 befs_ino->i_inode_num.start, befs_ino->i_inode_num.len);
320 bh = sb_bread(sb, inode->i_ino);
322 befs_error(sb, "unable to read inode block - "
323 "inode = %lu", inode->i_ino);
327 raw_inode = (befs_inode *) bh->b_data;
329 befs_dump_inode(sb, raw_inode);
331 if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) {
332 befs_error(sb, "Bad inode: %lu", inode->i_ino);
336 inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode);
339 * set uid and gid. But since current BeOS is single user OS, so
340 * you can change by "uid" or "gid" options.
343 inode->i_uid = befs_sb->mount_opts.use_uid ?
344 befs_sb->mount_opts.uid :
345 make_kuid(&init_user_ns, fs32_to_cpu(sb, raw_inode->uid));
346 inode->i_gid = befs_sb->mount_opts.use_gid ?
347 befs_sb->mount_opts.gid :
348 make_kgid(&init_user_ns, fs32_to_cpu(sb, raw_inode->gid));
353 * BEFS's time is 64 bits, but current VFS is 32 bits...
354 * BEFS don't have access time. Nor inode change time. VFS
355 * doesn't have creation time.
356 * Also, the lower 16 bits of the last_modified_time and
357 * create_time are just a counter to help ensure uniqueness
358 * for indexing purposes. (PFD, page 54)
361 inode->i_mtime.tv_sec =
362 fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16;
363 inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */
364 inode->i_ctime = inode->i_mtime;
365 inode->i_atime = inode->i_mtime;
367 befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num);
368 befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent);
369 befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes);
370 befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags);
372 if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){
374 inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE;
375 strlcpy(befs_ino->i_data.symlink, raw_inode->data.symlink,
380 befs_ino->i_data.ds =
381 fsds_to_cpu(sb, &raw_inode->data.datastream);
383 num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds);
385 num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE);
386 inode->i_size = befs_ino->i_data.ds.size;
389 inode->i_mapping->a_ops = &befs_aops;
391 if (S_ISREG(inode->i_mode)) {
392 inode->i_fop = &generic_ro_fops;
393 } else if (S_ISDIR(inode->i_mode)) {
394 inode->i_op = &befs_dir_inode_operations;
395 inode->i_fop = &befs_dir_operations;
396 } else if (S_ISLNK(inode->i_mode)) {
397 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
398 inode->i_op = &page_symlink_inode_operations;
399 inode_nohighmem(inode);
400 inode->i_mapping->a_ops = &befs_symlink_aops;
402 inode->i_link = befs_ino->i_data.symlink;
403 inode->i_op = &simple_symlink_inode_operations;
406 befs_error(sb, "Inode %lu is not a regular file, "
407 "directory or symlink. THAT IS WRONG! BeFS has no "
408 "on disk special files", inode->i_ino);
413 befs_debug(sb, "<--- %s", __func__);
414 unlock_new_inode(inode);
422 befs_debug(sb, "<--- %s - Bad inode", __func__);
423 return ERR_PTR(-EIO);
426 /* Initialize the inode cache. Called at fs setup.
428 * Taken from NFS implementation by Al Viro.
431 befs_init_inodecache(void)
433 befs_inode_cachep = kmem_cache_create("befs_inode_cache",
434 sizeof (struct befs_inode_info),
435 0, (SLAB_RECLAIM_ACCOUNT|
436 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
438 if (befs_inode_cachep == NULL)
444 /* Called at fs teardown.
446 * Taken from NFS implementation by Al Viro.
449 befs_destroy_inodecache(void)
452 * Make sure all delayed rcu free inodes are flushed before we
456 kmem_cache_destroy(befs_inode_cachep);
460 * The inode of symbolic link is different to data stream.
461 * The data stream become link name. Unless the LONG_SYMLINK
464 static int befs_symlink_readpage(struct file *unused, struct page *page)
466 struct inode *inode = page->mapping->host;
467 struct super_block *sb = inode->i_sb;
468 struct befs_inode_info *befs_ino = BEFS_I(inode);
469 befs_data_stream *data = &befs_ino->i_data.ds;
470 befs_off_t len = data->size;
471 char *link = page_address(page);
473 if (len == 0 || len > PAGE_SIZE) {
474 befs_error(sb, "Long symlink with illegal length");
477 befs_debug(sb, "Follow long symlink");
479 if (befs_read_lsymlink(sb, data, link, len) != len) {
480 befs_error(sb, "Failed to read entire long symlink");
483 link[len - 1] = '\0';
484 SetPageUptodate(page);
494 * UTF-8 to NLS charset convert routine
497 * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than
498 * the nls tables directly
502 befs_utf2nls(struct super_block *sb, const char *in,
503 int in_len, char **out, int *out_len)
505 struct nls_table *nls = BEFS_SB(sb)->nls;
510 /* The utf8->nls conversion won't make the final nls string bigger
511 * than the utf one, but if the string is pure ascii they'll have the
512 * same width and an extra char is needed to save the additional \0
514 int maxlen = in_len + 1;
516 befs_debug(sb, "---> %s", __func__);
519 befs_error(sb, "%s called with no NLS table loaded", __func__);
523 *out = result = kmalloc(maxlen, GFP_NOFS);
528 for (i = o = 0; i < in_len; i += utflen, o += unilen) {
530 /* convert from UTF-8 to Unicode */
531 utflen = utf8_to_utf32(&in[i], in_len - i, &uni);
535 /* convert from Unicode to nls */
536 if (uni > MAX_WCHAR_T)
538 unilen = nls->uni2char(uni, &result[o], in_len - o);
545 befs_debug(sb, "<--- %s", __func__);
550 befs_error(sb, "Name using character set %s contains a character that "
551 "cannot be converted to unicode.", nls->charset);
552 befs_debug(sb, "<--- %s", __func__);
558 * befs_nls2utf - Convert NLS string to utf8 encodeing
560 * @in: Input string buffer in NLS format
561 * @in_len: Length of input string in bytes
562 * @out: The output string in UTF-8 format
563 * @out_len: Length of the output buffer
565 * Converts input string @in, which is in the format of the loaded NLS map,
566 * into a utf8 string.
568 * The destination string @out is allocated by this function and the caller is
569 * responsible for freeing it with kfree()
571 * On return, *@out_len is the length of @out in bytes.
573 * On success, the return value is the number of utf8 characters written to
574 * the output buffer @out.
576 * On Failure, a negative number coresponding to the error code is returned.
580 befs_nls2utf(struct super_block *sb, const char *in,
581 int in_len, char **out, int *out_len)
583 struct nls_table *nls = BEFS_SB(sb)->nls;
588 /* There're nls characters that will translate to 3-chars-wide UTF-8
589 * characters, a additional byte is needed to save the final \0
590 * in special cases */
591 int maxlen = (3 * in_len) + 1;
593 befs_debug(sb, "---> %s\n", __func__);
596 befs_error(sb, "%s called with no NLS table loaded.",
601 *out = result = kmalloc(maxlen, GFP_NOFS);
607 for (i = o = 0; i < in_len; i += unilen, o += utflen) {
609 /* convert from nls to unicode */
610 unilen = nls->char2uni(&in[i], in_len - i, &uni);
614 /* convert from unicode to UTF-8 */
615 utflen = utf32_to_utf8(uni, &result[o], 3);
623 befs_debug(sb, "<--- %s", __func__);
628 befs_error(sb, "Name using charecter set %s contains a charecter that "
629 "cannot be converted to unicode.", nls->charset);
630 befs_debug(sb, "<--- %s", __func__);
636 Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err,
639 static const match_table_t befs_tokens = {
642 {Opt_charset, "iocharset=%s"},
643 {Opt_debug, "debug"},
648 parse_options(char *options, struct befs_mount_options *opts)
651 substring_t args[MAX_OPT_ARGS];
656 /* Initialize options */
657 opts->uid = GLOBAL_ROOT_UID;
658 opts->gid = GLOBAL_ROOT_GID;
661 opts->iocharset = NULL;
667 while ((p = strsep(&options, ",")) != NULL) {
672 token = match_token(p, befs_tokens, args);
675 if (match_int(&args[0], &option))
679 uid = make_kuid(current_user_ns(), option);
680 if (!uid_valid(uid)) {
681 pr_err("Invalid uid %d, "
682 "using default\n", option);
689 if (match_int(&args[0], &option))
693 gid = make_kgid(current_user_ns(), option);
694 if (!gid_valid(gid)) {
695 pr_err("Invalid gid %d, "
696 "using default\n", option);
703 kfree(opts->iocharset);
704 opts->iocharset = match_strdup(&args[0]);
705 if (!opts->iocharset) {
706 pr_err("allocation failure for "
707 "iocharset string\n");
715 pr_err("Unrecognized mount option \"%s\" "
716 "or missing value\n", p);
723 /* This function has the responsibiltiy of getting the
724 * filesystem ready for unmounting.
725 * Basically, we free everything that we allocated in
729 befs_put_super(struct super_block *sb)
731 kfree(BEFS_SB(sb)->mount_opts.iocharset);
732 BEFS_SB(sb)->mount_opts.iocharset = NULL;
733 unload_nls(BEFS_SB(sb)->nls);
734 kfree(sb->s_fs_info);
735 sb->s_fs_info = NULL;
738 /* Allocate private field of the superblock, fill it.
740 * Finish filling the public superblock fields
741 * Make the root directory
742 * Load a set of NLS translations if needed.
745 befs_fill_super(struct super_block *sb, void *data, int silent)
747 struct buffer_head *bh;
748 struct befs_sb_info *befs_sb;
749 befs_super_block *disk_sb;
752 const unsigned long sb_block = 0;
753 const off_t x86_sb_off = 512;
756 save_mount_options(sb, data);
758 sb->s_fs_info = kzalloc(sizeof(*befs_sb), GFP_KERNEL);
759 if (sb->s_fs_info == NULL)
762 befs_sb = BEFS_SB(sb);
764 if (!parse_options((char *) data, &befs_sb->mount_opts)) {
766 befs_error(sb, "cannot parse mount options");
767 goto unacquire_priv_sbp;
770 befs_debug(sb, "---> %s", __func__);
772 if (!(sb->s_flags & MS_RDONLY)) {
774 "No write support. Marking filesystem read-only");
775 sb->s_flags |= MS_RDONLY;
779 * Set dummy blocksize to read super block.
780 * Will be set to real fs blocksize later.
782 * Linux 2.4.10 and later refuse to read blocks smaller than
783 * the logical block size for the device. But we also need to read at
784 * least 1k to get the second 512 bytes of the volume.
787 blocksize = sb_min_blocksize(sb, 1024);
790 befs_error(sb, "unable to set blocksize");
791 goto unacquire_priv_sbp;
794 if (!(bh = sb_bread(sb, sb_block))) {
796 befs_error(sb, "unable to read superblock");
797 goto unacquire_priv_sbp;
800 /* account for offset of super block on x86 */
801 disk_sb = (befs_super_block *) bh->b_data;
802 if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) ||
803 (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) {
804 befs_debug(sb, "Using PPC superblock location");
806 befs_debug(sb, "Using x86 superblock location");
808 (befs_super_block *) ((void *) bh->b_data + x86_sb_off);
811 if ((befs_load_sb(sb, disk_sb) != BEFS_OK) ||
812 (befs_check_sb(sb) != BEFS_OK))
815 befs_dump_super_block(sb, disk_sb);
819 if( befs_sb->num_blocks > ~((sector_t)0) ) {
821 befs_error(sb, "blocks count: %llu is larger than the host can use",
822 befs_sb->num_blocks);
823 goto unacquire_priv_sbp;
827 * set up enough so that it can read an inode
828 * Fill in kernel superblock fields from private sb
830 sb->s_magic = BEFS_SUPER_MAGIC;
831 /* Set real blocksize of fs */
832 sb_set_blocksize(sb, (ulong) befs_sb->block_size);
833 sb->s_op = &befs_sops;
834 root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir)));
837 goto unacquire_priv_sbp;
839 sb->s_root = d_make_root(root);
842 befs_error(sb, "get root inode failed");
843 goto unacquire_priv_sbp;
846 /* load nls library */
847 if (befs_sb->mount_opts.iocharset) {
848 befs_debug(sb, "Loading nls: %s",
849 befs_sb->mount_opts.iocharset);
850 befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset);
852 befs_warning(sb, "Cannot load nls %s"
853 " loading default nls",
854 befs_sb->mount_opts.iocharset);
855 befs_sb->nls = load_nls_default();
857 /* load default nls if none is specified in mount options */
859 befs_debug(sb, "Loading default nls");
860 befs_sb->nls = load_nls_default();
869 kfree(befs_sb->mount_opts.iocharset);
870 kfree(sb->s_fs_info);
871 sb->s_fs_info = NULL;
878 befs_remount(struct super_block *sb, int *flags, char *data)
881 if (!(*flags & MS_RDONLY))
887 befs_statfs(struct dentry *dentry, struct kstatfs *buf)
889 struct super_block *sb = dentry->d_sb;
890 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
892 befs_debug(sb, "---> %s", __func__);
894 buf->f_type = BEFS_SUPER_MAGIC;
895 buf->f_bsize = sb->s_blocksize;
896 buf->f_blocks = BEFS_SB(sb)->num_blocks;
897 buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks;
898 buf->f_bavail = buf->f_bfree;
899 buf->f_files = 0; /* UNKNOWN */
900 buf->f_ffree = 0; /* UNKNOWN */
901 buf->f_fsid.val[0] = (u32)id;
902 buf->f_fsid.val[1] = (u32)(id >> 32);
903 buf->f_namelen = BEFS_NAME_LEN;
905 befs_debug(sb, "<--- %s", __func__);
910 static struct dentry *
911 befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name,
914 return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super);
917 static struct file_system_type befs_fs_type = {
918 .owner = THIS_MODULE,
921 .kill_sb = kill_block_super,
922 .fs_flags = FS_REQUIRES_DEV,
924 MODULE_ALIAS_FS("befs");
931 pr_info("version: %s\n", BEFS_VERSION);
933 err = befs_init_inodecache();
937 err = register_filesystem(&befs_fs_type);
939 goto unacquire_inodecache;
943 unacquire_inodecache:
944 befs_destroy_inodecache();
953 befs_destroy_inodecache();
955 unregister_filesystem(&befs_fs_type);
959 Macros that typecheck the init and exit functions,
960 ensures that they are called at init and cleanup,
961 and eliminates warnings about unused functions.
963 module_init(init_befs_fs)
964 module_exit(exit_befs_fs)