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 void *befs_follow_link(struct dentry *, struct nameidata *);
46 static void *befs_fast_follow_link(struct dentry *, struct nameidata *);
47 static int befs_utf2nls(struct super_block *sb, const char *in, int in_len,
48 char **out, int *out_len);
49 static int befs_nls2utf(struct super_block *sb, const char *in, int in_len,
50 char **out, int *out_len);
51 static void befs_put_super(struct super_block *);
52 static int befs_remount(struct super_block *, int *, char *);
53 static int befs_statfs(struct dentry *, struct kstatfs *);
54 static int parse_options(char *, struct befs_mount_options *);
56 static 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,
65 /* slab cache for befs_inode_info objects */
66 static struct kmem_cache *befs_inode_cachep;
68 static const struct file_operations befs_dir_operations = {
69 .read = generic_read_dir,
70 .iterate = befs_readdir,
71 .llseek = generic_file_llseek,
74 static const struct inode_operations befs_dir_inode_operations = {
75 .lookup = befs_lookup,
78 static const struct address_space_operations befs_aops = {
79 .readpage = befs_readpage,
83 static const struct inode_operations befs_fast_symlink_inode_operations = {
84 .readlink = generic_readlink,
85 .follow_link = befs_fast_follow_link,
88 static const struct inode_operations befs_symlink_inode_operations = {
89 .readlink = generic_readlink,
90 .follow_link = befs_follow_link,
91 .put_link = kfree_put_link,
95 * Called by generic_file_read() to read a page of data
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.
102 befs_readpage(struct file *file, struct page *page)
104 return block_read_full_page(page, befs_get_block);
108 befs_bmap(struct address_space *mapping, sector_t block)
110 return generic_block_bmap(mapping, block, befs_get_block);
114 * Generic function to map a file position (block) to a
115 * disk offset (passed back in bh_result).
117 * Used by many higher level functions.
119 * Calls befs_fblock2brun() in datastream.c to do the real work.
125 befs_get_block(struct inode *inode, sector_t block,
126 struct buffer_head *bh_result, int create)
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;
134 befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld",
135 (unsigned long)inode->i_ino, (long)block);
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);
143 res = befs_fblock2brun(sb, ds, block, &run);
144 if (res != BEFS_OK) {
146 "<--- %s for inode %lu, block %ld ERROR",
147 __func__, (unsigned long)inode->i_ino,
152 disk_off = (ulong) iaddr2blockno(sb, &run);
154 map_bh(bh_result, inode->i_sb, disk_off);
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);
163 static struct dentry *
164 befs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
166 struct inode *inode = NULL;
167 struct super_block *sb = dir->i_sb;
168 befs_data_stream *ds = &BEFS_I(dir)->i_data.ds;
173 const char *name = dentry->d_name.name;
175 befs_debug(sb, "---> %s name %pd inode %ld", __func__,
178 /* Convert to UTF-8 */
179 if (BEFS_SB(sb)->nls) {
181 befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen);
183 befs_debug(sb, "<--- %s ERROR", __func__);
186 ret = befs_btree_find(sb, ds, utfname, &offset);
190 ret = befs_btree_find(sb, ds, dentry->d_name.name, &offset);
193 if (ret == BEFS_BT_NOT_FOUND) {
194 befs_debug(sb, "<--- %s %pd not found", __func__, dentry);
195 return ERR_PTR(-ENOENT);
197 } else if (ret != BEFS_OK || offset == 0) {
198 befs_warning(sb, "<--- %s Error", __func__);
199 return ERR_PTR(-ENODATA);
202 inode = befs_iget(dir->i_sb, (ino_t) offset);
204 return ERR_CAST(inode);
206 d_add(dentry, inode);
208 befs_debug(sb, "<--- %s", __func__);
214 befs_readdir(struct file *file, struct dir_context *ctx)
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;
222 unsigned char d_type;
223 char keybuf[BEFS_NAME_LEN + 1];
225 befs_debug(sb, "---> %s name %pD, inode %ld, ctx->pos %lld",
226 __func__, file, inode->i_ino, ctx->pos);
229 result = befs_btree_read(sb, ds, ctx->pos, BEFS_NAME_LEN + 1,
230 keybuf, &keysize, &value);
232 if (result == BEFS_ERR) {
233 befs_debug(sb, "<--- %s ERROR", __func__);
234 befs_error(sb, "IO error reading %pD (inode %lu)",
238 } else if (result == BEFS_BT_END) {
239 befs_debug(sb, "<--- %s END", __func__);
242 } else if (result == BEFS_BT_EMPTY) {
243 befs_debug(sb, "<--- %s Empty directory", __func__);
250 if (BEFS_SB(sb)->nls) {
254 befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen);
256 befs_debug(sb, "<--- %s ERROR", __func__);
259 if (!dir_emit(ctx, nlsname, nlsnamelen,
260 (ino_t) value, d_type)) {
266 if (!dir_emit(ctx, keybuf, keysize,
267 (ino_t) value, d_type))
274 static struct inode *
275 befs_alloc_inode(struct super_block *sb)
277 struct befs_inode_info *bi;
279 bi = kmem_cache_alloc(befs_inode_cachep, GFP_KERNEL);
282 return &bi->vfs_inode;
285 static void befs_i_callback(struct rcu_head *head)
287 struct inode *inode = container_of(head, struct inode, i_rcu);
288 kmem_cache_free(befs_inode_cachep, BEFS_I(inode));
291 static void befs_destroy_inode(struct inode *inode)
293 call_rcu(&inode->i_rcu, befs_i_callback);
296 static void init_once(void *foo)
298 struct befs_inode_info *bi = (struct befs_inode_info *) foo;
300 inode_init_once(&bi->vfs_inode);
303 static struct inode *befs_iget(struct super_block *sb, unsigned long ino)
305 struct buffer_head *bh = NULL;
306 befs_inode *raw_inode = NULL;
307 struct befs_sb_info *befs_sb = BEFS_SB(sb);
308 befs_inode_info *befs_ino = NULL;
312 befs_debug(sb, "---> %s inode = %lu", __func__, ino);
314 inode = iget_locked(sb, ino);
316 return ERR_PTR(-ENOMEM);
317 if (!(inode->i_state & I_NEW))
320 befs_ino = BEFS_I(inode);
322 /* convert from vfs's inode number to befs's inode number */
323 befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino);
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);
329 bh = befs_bread(sb, inode->i_ino);
331 befs_error(sb, "unable to read inode block - "
332 "inode = %lu", inode->i_ino);
336 raw_inode = (befs_inode *) bh->b_data;
338 befs_dump_inode(sb, raw_inode);
340 if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) {
341 befs_error(sb, "Bad inode: %lu", inode->i_ino);
345 inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode);
348 * set uid and gid. But since current BeOS is single user OS, so
349 * you can change by "uid" or "gid" options.
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));
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)
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;
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);
381 if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){
383 inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE;
384 strlcpy(befs_ino->i_data.symlink, raw_inode->data.symlink,
389 befs_ino->i_data.ds =
390 fsds_to_cpu(sb, &raw_inode->data.datastream);
392 num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds);
394 num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE);
395 inode->i_size = befs_ino->i_data.ds.size;
398 inode->i_mapping->a_ops = &befs_aops;
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;
409 inode->i_op = &befs_fast_symlink_inode_operations;
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);
418 befs_debug(sb, "<--- %s", __func__);
419 unlock_new_inode(inode);
427 befs_debug(sb, "<--- %s - Bad inode", __func__);
431 /* Initialize the inode cache. Called at fs setup.
433 * Taken from NFS implementation by Al Viro.
436 befs_init_inodecache(void)
438 befs_inode_cachep = kmem_cache_create("befs_inode_cache",
439 sizeof (struct befs_inode_info),
440 0, (SLAB_RECLAIM_ACCOUNT|
443 if (befs_inode_cachep == NULL) {
444 pr_err("%s: Couldn't initialize inode slabcache\n", __func__);
450 /* Called at fs teardown.
452 * Taken from NFS implementation by Al Viro.
455 befs_destroy_inodecache(void)
458 * Make sure all delayed rcu free inodes are flushed before we
462 kmem_cache_destroy(befs_inode_cachep);
466 * The inode of symbolic link is different to data stream.
467 * The data stream become link name. Unless the LONG_SYMLINK
471 befs_follow_link(struct dentry *dentry, struct nameidata *nd)
473 struct super_block *sb = dentry->d_sb;
474 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode);
475 befs_data_stream *data = &befs_ino->i_data.ds;
476 befs_off_t len = data->size;
480 befs_error(sb, "Long symlink with illegal length");
481 link = ERR_PTR(-EIO);
483 befs_debug(sb, "Follow long symlink");
485 link = kmalloc(len, GFP_NOFS);
487 link = ERR_PTR(-ENOMEM);
488 } else if (befs_read_lsymlink(sb, data, link, len) != len) {
490 befs_error(sb, "Failed to read entire long symlink");
491 link = ERR_PTR(-EIO);
493 link[len - 1] = '\0';
496 nd_set_link(nd, link);
502 befs_fast_follow_link(struct dentry *dentry, struct nameidata *nd)
504 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode);
505 nd_set_link(nd, befs_ino->i_data.symlink);
510 * UTF-8 to NLS charset convert routine
513 * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than
514 * the nls tables directly
518 befs_utf2nls(struct super_block *sb, const char *in,
519 int in_len, char **out, int *out_len)
521 struct nls_table *nls = BEFS_SB(sb)->nls;
526 /* The utf8->nls conversion won't make the final nls string bigger
527 * than the utf one, but if the string is pure ascii they'll have the
528 * same width and an extra char is needed to save the additional \0
530 int maxlen = in_len + 1;
532 befs_debug(sb, "---> %s", __func__);
535 befs_error(sb, "%s called with no NLS table loaded", __func__);
539 *out = result = kmalloc(maxlen, GFP_NOFS);
541 befs_error(sb, "%s cannot allocate memory", __func__);
546 for (i = o = 0; i < in_len; i += utflen, o += unilen) {
548 /* convert from UTF-8 to Unicode */
549 utflen = utf8_to_utf32(&in[i], in_len - i, &uni);
553 /* convert from Unicode to nls */
554 if (uni > MAX_WCHAR_T)
556 unilen = nls->uni2char(uni, &result[o], in_len - o);
563 befs_debug(sb, "<--- %s", __func__);
568 befs_error(sb, "Name using character set %s contains a character that "
569 "cannot be converted to unicode.", nls->charset);
570 befs_debug(sb, "<--- %s", __func__);
576 * befs_nls2utf - Convert NLS string to utf8 encodeing
578 * @in: Input string buffer in NLS format
579 * @in_len: Length of input string in bytes
580 * @out: The output string in UTF-8 format
581 * @out_len: Length of the output buffer
583 * Converts input string @in, which is in the format of the loaded NLS map,
584 * into a utf8 string.
586 * The destination string @out is allocated by this function and the caller is
587 * responsible for freeing it with kfree()
589 * On return, *@out_len is the length of @out in bytes.
591 * On success, the return value is the number of utf8 characters written to
592 * the output buffer @out.
594 * On Failure, a negative number coresponding to the error code is returned.
598 befs_nls2utf(struct super_block *sb, const char *in,
599 int in_len, char **out, int *out_len)
601 struct nls_table *nls = BEFS_SB(sb)->nls;
606 /* There're nls characters that will translate to 3-chars-wide UTF-8
607 * characters, a additional byte is needed to save the final \0
608 * in special cases */
609 int maxlen = (3 * in_len) + 1;
611 befs_debug(sb, "---> %s\n", __func__);
614 befs_error(sb, "%s called with no NLS table loaded.",
619 *out = result = kmalloc(maxlen, GFP_NOFS);
621 befs_error(sb, "%s cannot allocate memory", __func__);
626 for (i = o = 0; i < in_len; i += unilen, o += utflen) {
628 /* convert from nls to unicode */
629 unilen = nls->char2uni(&in[i], in_len - i, &uni);
633 /* convert from unicode to UTF-8 */
634 utflen = utf32_to_utf8(uni, &result[o], 3);
642 befs_debug(sb, "<--- %s", __func__);
647 befs_error(sb, "Name using charecter set %s contains a charecter that "
648 "cannot be converted to unicode.", nls->charset);
649 befs_debug(sb, "<--- %s", __func__);
659 Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err,
662 static const match_table_t befs_tokens = {
665 {Opt_charset, "iocharset=%s"},
666 {Opt_debug, "debug"},
671 parse_options(char *options, struct befs_mount_options *opts)
674 substring_t args[MAX_OPT_ARGS];
679 /* Initialize options */
680 opts->uid = GLOBAL_ROOT_UID;
681 opts->gid = GLOBAL_ROOT_GID;
684 opts->iocharset = NULL;
690 while ((p = strsep(&options, ",")) != NULL) {
695 token = match_token(p, befs_tokens, args);
698 if (match_int(&args[0], &option))
702 uid = make_kuid(current_user_ns(), option);
703 if (!uid_valid(uid)) {
704 pr_err("Invalid uid %d, "
705 "using default\n", option);
712 if (match_int(&args[0], &option))
716 gid = make_kgid(current_user_ns(), option);
717 if (!gid_valid(gid)) {
718 pr_err("Invalid gid %d, "
719 "using default\n", option);
726 kfree(opts->iocharset);
727 opts->iocharset = match_strdup(&args[0]);
728 if (!opts->iocharset) {
729 pr_err("allocation failure for "
730 "iocharset string\n");
738 pr_err("Unrecognized mount option \"%s\" "
739 "or missing value\n", p);
746 /* This function has the responsibiltiy of getting the
747 * filesystem ready for unmounting.
748 * Basically, we free everything that we allocated in
752 befs_put_super(struct super_block *sb)
754 kfree(BEFS_SB(sb)->mount_opts.iocharset);
755 BEFS_SB(sb)->mount_opts.iocharset = NULL;
756 unload_nls(BEFS_SB(sb)->nls);
757 kfree(sb->s_fs_info);
758 sb->s_fs_info = NULL;
761 /* Allocate private field of the superblock, fill it.
763 * Finish filling the public superblock fields
764 * Make the root directory
765 * Load a set of NLS translations if needed.
768 befs_fill_super(struct super_block *sb, void *data, int silent)
770 struct buffer_head *bh;
771 struct befs_sb_info *befs_sb;
772 befs_super_block *disk_sb;
775 const unsigned long sb_block = 0;
776 const off_t x86_sb_off = 512;
778 save_mount_options(sb, data);
780 sb->s_fs_info = kzalloc(sizeof(*befs_sb), GFP_KERNEL);
781 if (sb->s_fs_info == NULL) {
782 pr_err("(%s): Unable to allocate memory for private "
783 "portion of superblock. Bailing.\n", sb->s_id);
786 befs_sb = BEFS_SB(sb);
788 if (!parse_options((char *) data, &befs_sb->mount_opts)) {
789 befs_error(sb, "cannot parse mount options");
790 goto unacquire_priv_sbp;
793 befs_debug(sb, "---> %s", __func__);
795 if (!(sb->s_flags & MS_RDONLY)) {
797 "No write support. Marking filesystem read-only");
798 sb->s_flags |= MS_RDONLY;
802 * Set dummy blocksize to read super block.
803 * Will be set to real fs blocksize later.
805 * Linux 2.4.10 and later refuse to read blocks smaller than
806 * the hardsect size for the device. But we also need to read at
807 * least 1k to get the second 512 bytes of the volume.
810 sb_min_blocksize(sb, 1024);
812 if (!(bh = sb_bread(sb, sb_block))) {
813 befs_error(sb, "unable to read superblock");
814 goto unacquire_priv_sbp;
817 /* account for offset of super block on x86 */
818 disk_sb = (befs_super_block *) bh->b_data;
819 if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) ||
820 (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) {
821 befs_debug(sb, "Using PPC superblock location");
823 befs_debug(sb, "Using x86 superblock location");
825 (befs_super_block *) ((void *) bh->b_data + x86_sb_off);
828 if ((befs_load_sb(sb, disk_sb) != BEFS_OK) ||
829 (befs_check_sb(sb) != BEFS_OK))
832 befs_dump_super_block(sb, disk_sb);
836 if( befs_sb->num_blocks > ~((sector_t)0) ) {
837 befs_error(sb, "blocks count: %llu "
838 "is larger than the host can use",
839 befs_sb->num_blocks);
840 goto unacquire_priv_sbp;
844 * set up enough so that it can read an inode
845 * Fill in kernel superblock fields from private sb
847 sb->s_magic = BEFS_SUPER_MAGIC;
848 /* Set real blocksize of fs */
849 sb_set_blocksize(sb, (ulong) befs_sb->block_size);
850 sb->s_op = &befs_sops;
851 root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir)));
854 goto unacquire_priv_sbp;
856 sb->s_root = d_make_root(root);
858 befs_error(sb, "get root inode failed");
859 goto unacquire_priv_sbp;
862 /* load nls library */
863 if (befs_sb->mount_opts.iocharset) {
864 befs_debug(sb, "Loading nls: %s",
865 befs_sb->mount_opts.iocharset);
866 befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset);
868 befs_warning(sb, "Cannot load nls %s"
869 " loading default nls",
870 befs_sb->mount_opts.iocharset);
871 befs_sb->nls = load_nls_default();
873 /* load default nls if none is specified in mount options */
875 befs_debug(sb, "Loading default nls");
876 befs_sb->nls = load_nls_default();
885 kfree(befs_sb->mount_opts.iocharset);
886 kfree(sb->s_fs_info);
889 sb->s_fs_info = NULL;
894 befs_remount(struct super_block *sb, int *flags, char *data)
897 if (!(*flags & MS_RDONLY))
903 befs_statfs(struct dentry *dentry, struct kstatfs *buf)
905 struct super_block *sb = dentry->d_sb;
906 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
908 befs_debug(sb, "---> %s", __func__);
910 buf->f_type = BEFS_SUPER_MAGIC;
911 buf->f_bsize = sb->s_blocksize;
912 buf->f_blocks = BEFS_SB(sb)->num_blocks;
913 buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks;
914 buf->f_bavail = buf->f_bfree;
915 buf->f_files = 0; /* UNKNOWN */
916 buf->f_ffree = 0; /* UNKNOWN */
917 buf->f_fsid.val[0] = (u32)id;
918 buf->f_fsid.val[1] = (u32)(id >> 32);
919 buf->f_namelen = BEFS_NAME_LEN;
921 befs_debug(sb, "<--- %s", __func__);
926 static struct dentry *
927 befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name,
930 return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super);
933 static struct file_system_type befs_fs_type = {
934 .owner = THIS_MODULE,
937 .kill_sb = kill_block_super,
938 .fs_flags = FS_REQUIRES_DEV,
940 MODULE_ALIAS_FS("befs");
947 pr_info("version: %s\n", BEFS_VERSION);
949 err = befs_init_inodecache();
953 err = register_filesystem(&befs_fs_type);
955 goto unacquire_inodecache;
959 unacquire_inodecache:
960 befs_destroy_inodecache();
969 befs_destroy_inodecache();
971 unregister_filesystem(&befs_fs_type);
975 Macros that typecheck the init and exit functions,
976 ensures that they are called at init and cleanup,
977 and eliminates warnings about unused functions.
979 module_init(init_befs_fs)
980 module_exit(exit_befs_fs)