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 *, 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);
138 befs_error(sb, "befs_get_block() was asked for a block "
139 "number less than zero: block %ld in inode %lu",
140 (long)block, (unsigned long)inode->i_ino);
145 befs_error(sb, "befs_get_block() was asked to write to "
146 "block %ld in inode %lu", (long)block,
147 (unsigned long)inode->i_ino);
151 res = befs_fblock2brun(sb, ds, block, &run);
152 if (res != BEFS_OK) {
154 "<--- %s for inode %lu, block %ld ERROR",
155 __func__, (unsigned long)inode->i_ino,
160 disk_off = (ulong) iaddr2blockno(sb, &run);
162 map_bh(bh_result, inode->i_sb, disk_off);
164 befs_debug(sb, "<--- %s for inode %lu, block %ld, disk address %lu",
165 __func__, (unsigned long)inode->i_ino, (long)block,
166 (unsigned long)disk_off);
171 static struct dentry *
172 befs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
174 struct inode *inode = NULL;
175 struct super_block *sb = dir->i_sb;
176 befs_data_stream *ds = &BEFS_I(dir)->i_data.ds;
181 const char *name = dentry->d_name.name;
183 befs_debug(sb, "---> %s name %s inode %ld", __func__,
184 dentry->d_name.name, dir->i_ino);
186 /* Convert to UTF-8 */
187 if (BEFS_SB(sb)->nls) {
189 befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen);
191 befs_debug(sb, "<--- %s ERROR", __func__);
194 ret = befs_btree_find(sb, ds, utfname, &offset);
198 ret = befs_btree_find(sb, ds, dentry->d_name.name, &offset);
201 if (ret == BEFS_BT_NOT_FOUND) {
202 befs_debug(sb, "<--- %s %s not found", __func__,
203 dentry->d_name.name);
204 return ERR_PTR(-ENOENT);
206 } else if (ret != BEFS_OK || offset == 0) {
207 befs_warning(sb, "<--- %s Error", __func__);
208 return ERR_PTR(-ENODATA);
211 inode = befs_iget(dir->i_sb, (ino_t) offset);
213 return ERR_CAST(inode);
215 d_add(dentry, inode);
217 befs_debug(sb, "<--- %s", __func__);
223 befs_readdir(struct file *file, struct dir_context *ctx)
225 struct inode *inode = file_inode(file);
226 struct super_block *sb = inode->i_sb;
227 befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
231 unsigned char d_type;
232 char keybuf[BEFS_NAME_LEN + 1];
233 const char *dirname = file->f_path.dentry->d_name.name;
235 befs_debug(sb, "---> %s name %s, inode %ld, ctx->pos %lld",
236 __func__, dirname, inode->i_ino, ctx->pos);
239 result = befs_btree_read(sb, ds, ctx->pos, BEFS_NAME_LEN + 1,
240 keybuf, &keysize, &value);
242 if (result == BEFS_ERR) {
243 befs_debug(sb, "<--- %s ERROR", __func__);
244 befs_error(sb, "IO error reading %s (inode %lu)",
245 dirname, inode->i_ino);
248 } else if (result == BEFS_BT_END) {
249 befs_debug(sb, "<--- %s END", __func__);
252 } else if (result == BEFS_BT_EMPTY) {
253 befs_debug(sb, "<--- %s Empty directory", __func__);
260 if (BEFS_SB(sb)->nls) {
264 befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen);
266 befs_debug(sb, "<--- %s ERROR", __func__);
269 if (!dir_emit(ctx, nlsname, nlsnamelen,
270 (ino_t) value, d_type)) {
276 if (!dir_emit(ctx, keybuf, keysize,
277 (ino_t) value, d_type))
283 befs_debug(sb, "<--- %s pos %lld", __func__, ctx->pos);
288 static struct inode *
289 befs_alloc_inode(struct super_block *sb)
291 struct befs_inode_info *bi;
292 bi = (struct befs_inode_info *)kmem_cache_alloc(befs_inode_cachep,
296 return &bi->vfs_inode;
299 static void befs_i_callback(struct rcu_head *head)
301 struct inode *inode = container_of(head, struct inode, i_rcu);
302 kmem_cache_free(befs_inode_cachep, BEFS_I(inode));
305 static void befs_destroy_inode(struct inode *inode)
307 call_rcu(&inode->i_rcu, befs_i_callback);
310 static void init_once(void *foo)
312 struct befs_inode_info *bi = (struct befs_inode_info *) foo;
314 inode_init_once(&bi->vfs_inode);
317 static struct inode *befs_iget(struct super_block *sb, unsigned long ino)
319 struct buffer_head *bh = NULL;
320 befs_inode *raw_inode = NULL;
322 befs_sb_info *befs_sb = BEFS_SB(sb);
323 befs_inode_info *befs_ino = NULL;
327 befs_debug(sb, "---> %s inode = %lu", __func__, ino);
329 inode = iget_locked(sb, ino);
331 return ERR_PTR(-ENOMEM);
332 if (!(inode->i_state & I_NEW))
335 befs_ino = BEFS_I(inode);
337 /* convert from vfs's inode number to befs's inode number */
338 befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino);
340 befs_debug(sb, " real inode number [%u, %hu, %hu]",
341 befs_ino->i_inode_num.allocation_group,
342 befs_ino->i_inode_num.start, befs_ino->i_inode_num.len);
344 bh = befs_bread(sb, inode->i_ino);
346 befs_error(sb, "unable to read inode block - "
347 "inode = %lu", inode->i_ino);
351 raw_inode = (befs_inode *) bh->b_data;
353 befs_dump_inode(sb, raw_inode);
355 if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) {
356 befs_error(sb, "Bad inode: %lu", inode->i_ino);
360 inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode);
363 * set uid and gid. But since current BeOS is single user OS, so
364 * you can change by "uid" or "gid" options.
367 inode->i_uid = befs_sb->mount_opts.use_uid ?
368 befs_sb->mount_opts.uid :
369 make_kuid(&init_user_ns, fs32_to_cpu(sb, raw_inode->uid));
370 inode->i_gid = befs_sb->mount_opts.use_gid ?
371 befs_sb->mount_opts.gid :
372 make_kgid(&init_user_ns, fs32_to_cpu(sb, raw_inode->gid));
377 * BEFS's time is 64 bits, but current VFS is 32 bits...
378 * BEFS don't have access time. Nor inode change time. VFS
379 * doesn't have creation time.
380 * Also, the lower 16 bits of the last_modified_time and
381 * create_time are just a counter to help ensure uniqueness
382 * for indexing purposes. (PFD, page 54)
385 inode->i_mtime.tv_sec =
386 fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16;
387 inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */
388 inode->i_ctime = inode->i_mtime;
389 inode->i_atime = inode->i_mtime;
391 befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num);
392 befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent);
393 befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes);
394 befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags);
396 if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){
398 inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE;
399 strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink,
400 BEFS_SYMLINK_LEN - 1);
401 befs_ino->i_data.symlink[BEFS_SYMLINK_LEN - 1] = '\0';
405 befs_ino->i_data.ds =
406 fsds_to_cpu(sb, &raw_inode->data.datastream);
408 num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds);
410 num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE);
411 inode->i_size = befs_ino->i_data.ds.size;
414 inode->i_mapping->a_ops = &befs_aops;
416 if (S_ISREG(inode->i_mode)) {
417 inode->i_fop = &generic_ro_fops;
418 } else if (S_ISDIR(inode->i_mode)) {
419 inode->i_op = &befs_dir_inode_operations;
420 inode->i_fop = &befs_dir_operations;
421 } else if (S_ISLNK(inode->i_mode)) {
422 if (befs_ino->i_flags & BEFS_LONG_SYMLINK)
423 inode->i_op = &befs_symlink_inode_operations;
425 inode->i_op = &befs_fast_symlink_inode_operations;
427 befs_error(sb, "Inode %lu is not a regular file, "
428 "directory or symlink. THAT IS WRONG! BeFS has no "
429 "on disk special files", inode->i_ino);
434 befs_debug(sb, "<--- %s", __func__);
435 unlock_new_inode(inode);
443 befs_debug(sb, "<--- %s - Bad inode", __func__);
447 /* Initialize the inode cache. Called at fs setup.
449 * Taken from NFS implementation by Al Viro.
452 befs_init_inodecache(void)
454 befs_inode_cachep = kmem_cache_create("befs_inode_cache",
455 sizeof (struct befs_inode_info),
456 0, (SLAB_RECLAIM_ACCOUNT|
459 if (befs_inode_cachep == NULL) {
460 pr_err("%s: Couldn't initialize inode slabcache\n", __func__);
466 /* Called at fs teardown.
468 * Taken from NFS implementation by Al Viro.
471 befs_destroy_inodecache(void)
474 * Make sure all delayed rcu free inodes are flushed before we
478 kmem_cache_destroy(befs_inode_cachep);
482 * The inode of symbolic link is different to data stream.
483 * The data stream become link name. Unless the LONG_SYMLINK
487 befs_follow_link(struct dentry *dentry, struct nameidata *nd)
489 struct super_block *sb = dentry->d_sb;
490 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode);
491 befs_data_stream *data = &befs_ino->i_data.ds;
492 befs_off_t len = data->size;
496 befs_error(sb, "Long symlink with illegal length");
497 link = ERR_PTR(-EIO);
499 befs_debug(sb, "Follow long symlink");
501 link = kmalloc(len, GFP_NOFS);
503 link = ERR_PTR(-ENOMEM);
504 } else if (befs_read_lsymlink(sb, data, link, len) != len) {
506 befs_error(sb, "Failed to read entire long symlink");
507 link = ERR_PTR(-EIO);
509 link[len - 1] = '\0';
512 nd_set_link(nd, link);
518 befs_fast_follow_link(struct dentry *dentry, struct nameidata *nd)
520 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode);
521 nd_set_link(nd, befs_ino->i_data.symlink);
526 * UTF-8 to NLS charset convert routine
529 * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than
530 * the nls tables directly
534 befs_utf2nls(struct super_block *sb, const char *in,
535 int in_len, char **out, int *out_len)
537 struct nls_table *nls = BEFS_SB(sb)->nls;
542 /* The utf8->nls conversion won't make the final nls string bigger
543 * than the utf one, but if the string is pure ascii they'll have the
544 * same width and an extra char is needed to save the additional \0
546 int maxlen = in_len + 1;
548 befs_debug(sb, "---> %s", __func__);
551 befs_error(sb, "%s called with no NLS table loaded", __func__);
555 *out = result = kmalloc(maxlen, GFP_NOFS);
557 befs_error(sb, "%s cannot allocate memory", __func__);
562 for (i = o = 0; i < in_len; i += utflen, o += unilen) {
564 /* convert from UTF-8 to Unicode */
565 utflen = utf8_to_utf32(&in[i], in_len - i, &uni);
569 /* convert from Unicode to nls */
570 if (uni > MAX_WCHAR_T)
572 unilen = nls->uni2char(uni, &result[o], in_len - o);
579 befs_debug(sb, "<--- %s", __func__);
584 befs_error(sb, "Name using character set %s contains a character that "
585 "cannot be converted to unicode.", nls->charset);
586 befs_debug(sb, "<--- %s", __func__);
592 * befs_nls2utf - Convert NLS string to utf8 encodeing
594 * @src: Input string buffer in NLS format
595 * @srclen: Length of input string in bytes
596 * @dest: The output string in UTF-8 format
597 * @destlen: Length of the output buffer
599 * Converts input string @src, which is in the format of the loaded NLS map,
600 * into a utf8 string.
602 * The destination string @dest is allocated by this function and the caller is
603 * responsible for freeing it with kfree()
605 * On return, *@destlen is the length of @dest in bytes.
607 * On success, the return value is the number of utf8 characters written to
608 * the output buffer @dest.
610 * On Failure, a negative number coresponding to the error code is returned.
614 befs_nls2utf(struct super_block *sb, const char *in,
615 int in_len, char **out, int *out_len)
617 struct nls_table *nls = BEFS_SB(sb)->nls;
622 /* There're nls characters that will translate to 3-chars-wide UTF-8
623 * characters, a additional byte is needed to save the final \0
624 * in special cases */
625 int maxlen = (3 * in_len) + 1;
627 befs_debug(sb, "---> %s\n", __func__);
630 befs_error(sb, "%s called with no NLS table loaded.",
635 *out = result = kmalloc(maxlen, GFP_NOFS);
637 befs_error(sb, "%s cannot allocate memory", __func__);
642 for (i = o = 0; i < in_len; i += unilen, o += utflen) {
644 /* convert from nls to unicode */
645 unilen = nls->char2uni(&in[i], in_len - i, &uni);
649 /* convert from unicode to UTF-8 */
650 utflen = utf32_to_utf8(uni, &result[o], 3);
658 befs_debug(sb, "<--- %s", __func__);
663 befs_error(sb, "Name using charecter set %s contains a charecter that "
664 "cannot be converted to unicode.", nls->charset);
665 befs_debug(sb, "<--- %s", __func__);
675 Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err,
678 static const match_table_t befs_tokens = {
681 {Opt_charset, "iocharset=%s"},
682 {Opt_debug, "debug"},
687 parse_options(char *options, befs_mount_options * opts)
690 substring_t args[MAX_OPT_ARGS];
695 /* Initialize options */
696 opts->uid = GLOBAL_ROOT_UID;
697 opts->gid = GLOBAL_ROOT_GID;
700 opts->iocharset = NULL;
706 while ((p = strsep(&options, ",")) != NULL) {
711 token = match_token(p, befs_tokens, args);
714 if (match_int(&args[0], &option))
718 uid = make_kuid(current_user_ns(), option);
719 if (!uid_valid(uid)) {
720 pr_err("Invalid uid %d, "
721 "using default\n", option);
728 if (match_int(&args[0], &option))
732 gid = make_kgid(current_user_ns(), option);
733 if (!gid_valid(gid)) {
734 pr_err("Invalid gid %d, "
735 "using default\n", option);
742 kfree(opts->iocharset);
743 opts->iocharset = match_strdup(&args[0]);
744 if (!opts->iocharset) {
745 pr_err("allocation failure for "
746 "iocharset string\n");
754 pr_err("Unrecognized mount option \"%s\" "
755 "or missing value\n", p);
762 /* This function has the responsibiltiy of getting the
763 * filesystem ready for unmounting.
764 * Basically, we free everything that we allocated in
768 befs_put_super(struct super_block *sb)
770 kfree(BEFS_SB(sb)->mount_opts.iocharset);
771 BEFS_SB(sb)->mount_opts.iocharset = NULL;
772 unload_nls(BEFS_SB(sb)->nls);
773 kfree(sb->s_fs_info);
774 sb->s_fs_info = NULL;
777 /* Allocate private field of the superblock, fill it.
779 * Finish filling the public superblock fields
780 * Make the root directory
781 * Load a set of NLS translations if needed.
784 befs_fill_super(struct super_block *sb, void *data, int silent)
786 struct buffer_head *bh;
787 befs_sb_info *befs_sb;
788 befs_super_block *disk_sb;
791 const unsigned long sb_block = 0;
792 const off_t x86_sb_off = 512;
794 save_mount_options(sb, data);
796 sb->s_fs_info = kzalloc(sizeof(*befs_sb), GFP_KERNEL);
797 if (sb->s_fs_info == NULL) {
798 pr_err("(%s): Unable to allocate memory for private "
799 "portion of superblock. Bailing.\n", sb->s_id);
802 befs_sb = BEFS_SB(sb);
804 if (!parse_options((char *) data, &befs_sb->mount_opts)) {
805 befs_error(sb, "cannot parse mount options");
806 goto unacquire_priv_sbp;
809 befs_debug(sb, "---> %s", __func__);
811 #ifndef CONFIG_BEFS_RW
812 if (!(sb->s_flags & MS_RDONLY)) {
814 "No write support. Marking filesystem read-only");
815 sb->s_flags |= MS_RDONLY;
817 #endif /* CONFIG_BEFS_RW */
820 * Set dummy blocksize to read super block.
821 * Will be set to real fs blocksize later.
823 * Linux 2.4.10 and later refuse to read blocks smaller than
824 * the hardsect size for the device. But we also need to read at
825 * least 1k to get the second 512 bytes of the volume.
828 sb_min_blocksize(sb, 1024);
830 if (!(bh = sb_bread(sb, sb_block))) {
831 befs_error(sb, "unable to read superblock");
832 goto unacquire_priv_sbp;
835 /* account for offset of super block on x86 */
836 disk_sb = (befs_super_block *) bh->b_data;
837 if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) ||
838 (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) {
839 befs_debug(sb, "Using PPC superblock location");
841 befs_debug(sb, "Using x86 superblock location");
843 (befs_super_block *) ((void *) bh->b_data + x86_sb_off);
846 if (befs_load_sb(sb, disk_sb) != BEFS_OK)
849 befs_dump_super_block(sb, disk_sb);
853 if (befs_check_sb(sb) != BEFS_OK)
854 goto unacquire_priv_sbp;
856 if( befs_sb->num_blocks > ~((sector_t)0) ) {
857 befs_error(sb, "blocks count: %llu "
858 "is larger than the host can use",
859 befs_sb->num_blocks);
860 goto unacquire_priv_sbp;
864 * set up enough so that it can read an inode
865 * Fill in kernel superblock fields from private sb
867 sb->s_magic = BEFS_SUPER_MAGIC;
868 /* Set real blocksize of fs */
869 sb_set_blocksize(sb, (ulong) befs_sb->block_size);
870 sb->s_op = &befs_sops;
871 root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir)));
874 goto unacquire_priv_sbp;
876 sb->s_root = d_make_root(root);
878 befs_error(sb, "get root inode failed");
879 goto unacquire_priv_sbp;
882 /* load nls library */
883 if (befs_sb->mount_opts.iocharset) {
884 befs_debug(sb, "Loading nls: %s",
885 befs_sb->mount_opts.iocharset);
886 befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset);
888 befs_warning(sb, "Cannot load nls %s"
889 " loading default nls",
890 befs_sb->mount_opts.iocharset);
891 befs_sb->nls = load_nls_default();
893 /* load default nls if none is specified in mount options */
895 befs_debug(sb, "Loading default nls");
896 befs_sb->nls = load_nls_default();
905 kfree(befs_sb->mount_opts.iocharset);
906 kfree(sb->s_fs_info);
909 sb->s_fs_info = NULL;
914 befs_remount(struct super_block *sb, int *flags, char *data)
917 if (!(*flags & MS_RDONLY))
923 befs_statfs(struct dentry *dentry, struct kstatfs *buf)
925 struct super_block *sb = dentry->d_sb;
926 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
928 befs_debug(sb, "---> %s", __func__);
930 buf->f_type = BEFS_SUPER_MAGIC;
931 buf->f_bsize = sb->s_blocksize;
932 buf->f_blocks = BEFS_SB(sb)->num_blocks;
933 buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks;
934 buf->f_bavail = buf->f_bfree;
935 buf->f_files = 0; /* UNKNOWN */
936 buf->f_ffree = 0; /* UNKNOWN */
937 buf->f_fsid.val[0] = (u32)id;
938 buf->f_fsid.val[1] = (u32)(id >> 32);
939 buf->f_namelen = BEFS_NAME_LEN;
941 befs_debug(sb, "<--- %s", __func__);
946 static struct dentry *
947 befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name,
950 return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super);
953 static struct file_system_type befs_fs_type = {
954 .owner = THIS_MODULE,
957 .kill_sb = kill_block_super,
958 .fs_flags = FS_REQUIRES_DEV,
960 MODULE_ALIAS_FS("befs");
967 pr_info("version: %s\n", BEFS_VERSION);
969 err = befs_init_inodecache();
973 err = register_filesystem(&befs_fs_type);
975 goto unacquire_inodecache;
979 unacquire_inodecache:
980 befs_destroy_inodecache();
989 befs_destroy_inodecache();
991 unregister_filesystem(&befs_fs_type);
995 Macros that typecheck the init and exit functions,
996 ensures that they are called at init and cleanup,
997 and eliminates warnings about unused functions.
999 module_init(init_befs_fs)
1000 module_exit(exit_befs_fs)