/* * linux/fs/befs/linuxvfs.c * * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com * */ #include <linux/module.h> #include <linux/slab.h> #include <linux/fs.h> #include <linux/errno.h> #include <linux/stat.h> #include <linux/nls.h> #include <linux/buffer_head.h> #include <linux/vfs.h> #include <linux/parser.h> #include <linux/namei.h> #include "befs.h" #include "btree.h" #include "inode.h" #include "datastream.h" #include "super.h" #include "io.h" MODULE_DESCRIPTION("BeOS File System (BeFS) driver"); MODULE_AUTHOR("Will Dyson"); MODULE_LICENSE("GPL"); /* The units the vfs expects inode->i_blocks to be in */ #define VFS_BLOCK_SIZE 512 static int befs_readdir(struct file *, void *, filldir_t); static int befs_get_block(struct inode *, sector_t, struct buffer_head *, int); static int befs_readpage(struct file *file, struct page *page); static sector_t befs_bmap(struct address_space *mapping, sector_t block); static struct dentry *befs_lookup(struct inode *, struct dentry *, struct nameidata *); static void befs_read_inode(struct inode *ino); static struct inode *befs_alloc_inode(struct super_block *sb); static void befs_destroy_inode(struct inode *inode); static int befs_init_inodecache(void); static void befs_destroy_inodecache(void); static void *befs_follow_link(struct dentry *, struct nameidata *); static void befs_put_link(struct dentry *, struct nameidata *, void *); static int befs_utf2nls(struct super_block *sb, const char *in, int in_len, char **out, int *out_len); static int befs_nls2utf(struct super_block *sb, const char *in, int in_len, char **out, int *out_len); static void befs_put_super(struct super_block *); static int befs_remount(struct super_block *, int *, char *); static int befs_statfs(struct dentry *, struct kstatfs *); static int parse_options(char *, befs_mount_options *); static const struct super_operations befs_sops = { .read_inode = befs_read_inode, /* initialize & read inode */ .alloc_inode = befs_alloc_inode, /* allocate a new inode */ .destroy_inode = befs_destroy_inode, /* deallocate an inode */ .put_super = befs_put_super, /* uninit super */ .statfs = befs_statfs, /* statfs */ .remount_fs = befs_remount, }; /* slab cache for befs_inode_info objects */ static struct kmem_cache *befs_inode_cachep; static const struct file_operations befs_dir_operations = { .read = generic_read_dir, .readdir = befs_readdir, }; static const struct inode_operations befs_dir_inode_operations = { .lookup = befs_lookup, }; static const struct address_space_operations befs_aops = { .readpage = befs_readpage, .sync_page = block_sync_page, .bmap = befs_bmap, }; static const struct inode_operations befs_symlink_inode_operations = { .readlink = generic_readlink, .follow_link = befs_follow_link, .put_link = befs_put_link, }; /* * Called by generic_file_read() to read a page of data * * In turn, simply calls a generic block read function and * passes it the address of befs_get_block, for mapping file * positions to disk blocks. */ static int befs_readpage(struct file *file, struct page *page) { return block_read_full_page(page, befs_get_block); } static sector_t befs_bmap(struct address_space *mapping, sector_t block) { return generic_block_bmap(mapping, block, befs_get_block); } /* * Generic function to map a file position (block) to a * disk offset (passed back in bh_result). * * Used by many higher level functions. * * Calls befs_fblock2brun() in datastream.c to do the real work. * * -WD 10-26-01 */ static int befs_get_block(struct inode *inode, sector_t block, struct buffer_head *bh_result, int create) { struct super_block *sb = inode->i_sb; befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; befs_block_run run = BAD_IADDR; int res = 0; ulong disk_off; befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld", inode->i_ino, block); if (block < 0) { befs_error(sb, "befs_get_block() was asked for a block " "number less than zero: block %ld in inode %lu", block, inode->i_ino); return -EIO; } if (create) { befs_error(sb, "befs_get_block() was asked to write to " "block %ld in inode %lu", block, inode->i_ino); return -EPERM; } res = befs_fblock2brun(sb, ds, block, &run); if (res != BEFS_OK) { befs_error(sb, "<--- befs_get_block() for inode %lu, block " "%ld ERROR", inode->i_ino, block); return -EFBIG; } disk_off = (ulong) iaddr2blockno(sb, &run); map_bh(bh_result, inode->i_sb, disk_off); befs_debug(sb, "<--- befs_get_block() for inode %lu, block %ld, " "disk address %lu", inode->i_ino, block, disk_off); return 0; } static struct dentry * befs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) { struct inode *inode = NULL; struct super_block *sb = dir->i_sb; befs_data_stream *ds = &BEFS_I(dir)->i_data.ds; befs_off_t offset; int ret; int utfnamelen; char *utfname; const char *name = dentry->d_name.name; befs_debug(sb, "---> befs_lookup() " "name %s inode %ld", dentry->d_name.name, dir->i_ino); /* Convert to UTF-8 */ if (BEFS_SB(sb)->nls) { ret = befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen); if (ret < 0) { befs_debug(sb, "<--- befs_lookup() ERROR"); return ERR_PTR(ret); } ret = befs_btree_find(sb, ds, utfname, &offset); kfree(utfname); } else { ret = befs_btree_find(sb, ds, dentry->d_name.name, &offset); } if (ret == BEFS_BT_NOT_FOUND) { befs_debug(sb, "<--- befs_lookup() %s not found", dentry->d_name.name); return ERR_PTR(-ENOENT); } else if (ret != BEFS_OK || offset == 0) { befs_warning(sb, "<--- befs_lookup() Error"); return ERR_PTR(-ENODATA); } inode = iget(dir->i_sb, (ino_t) offset); if (!inode) return ERR_PTR(-EACCES); d_add(dentry, inode); befs_debug(sb, "<--- befs_lookup()"); return NULL; } static int befs_readdir(struct file *filp, void *dirent, filldir_t filldir) { struct inode *inode = filp->f_path.dentry->d_inode; struct super_block *sb = inode->i_sb; befs_data_stream *ds = &BEFS_I(inode)->i_data.ds; befs_off_t value; int result; size_t keysize; unsigned char d_type; char keybuf[BEFS_NAME_LEN + 1]; char *nlsname; int nlsnamelen; const char *dirname = filp->f_path.dentry->d_name.name; befs_debug(sb, "---> befs_readdir() " "name %s, inode %ld, filp->f_pos %Ld", dirname, inode->i_ino, filp->f_pos); result = befs_btree_read(sb, ds, filp->f_pos, BEFS_NAME_LEN + 1, keybuf, &keysize, &value); if (result == BEFS_ERR) { befs_debug(sb, "<--- befs_readdir() ERROR"); befs_error(sb, "IO error reading %s (inode %lu)", dirname, inode->i_ino); return -EIO; } else if (result == BEFS_BT_END) { befs_debug(sb, "<--- befs_readdir() END"); return 0; } else if (result == BEFS_BT_EMPTY) { befs_debug(sb, "<--- befs_readdir() Empty directory"); return 0; } d_type = DT_UNKNOWN; /* Convert to NLS */ if (BEFS_SB(sb)->nls) { result = befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen); if (result < 0) { befs_debug(sb, "<--- befs_readdir() ERROR"); return result; } result = filldir(dirent, nlsname, nlsnamelen, filp->f_pos, (ino_t) value, d_type); kfree(nlsname); } else { result = filldir(dirent, keybuf, keysize, filp->f_pos, (ino_t) value, d_type); } filp->f_pos++; befs_debug(sb, "<--- befs_readdir() filp->f_pos %Ld", filp->f_pos); return 0; } static struct inode * befs_alloc_inode(struct super_block *sb) { struct befs_inode_info *bi; bi = (struct befs_inode_info *)kmem_cache_alloc(befs_inode_cachep, GFP_KERNEL); if (!bi) return NULL; return &bi->vfs_inode; } static void befs_destroy_inode(struct inode *inode) { kmem_cache_free(befs_inode_cachep, BEFS_I(inode)); } static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags) { struct befs_inode_info *bi = (struct befs_inode_info *) foo; inode_init_once(&bi->vfs_inode); } static void befs_read_inode(struct inode *inode) { struct buffer_head *bh = NULL; befs_inode *raw_inode = NULL; struct super_block *sb = inode->i_sb; befs_sb_info *befs_sb = BEFS_SB(sb); befs_inode_info *befs_ino = NULL; befs_debug(sb, "---> befs_read_inode() " "inode = %lu", inode->i_ino); befs_ino = BEFS_I(inode); /* convert from vfs's inode number to befs's inode number */ befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino); befs_debug(sb, " real inode number [%u, %hu, %hu]", befs_ino->i_inode_num.allocation_group, befs_ino->i_inode_num.start, befs_ino->i_inode_num.len); bh = befs_bread(sb, inode->i_ino); if (!bh) { befs_error(sb, "unable to read inode block - " "inode = %lu", inode->i_ino); goto unacquire_none; } raw_inode = (befs_inode *) bh->b_data; befs_dump_inode(sb, raw_inode); if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) { befs_error(sb, "Bad inode: %lu", inode->i_ino); goto unacquire_bh; } inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode); /* * set uid and gid. But since current BeOS is single user OS, so * you can change by "uid" or "gid" options. */ inode->i_uid = befs_sb->mount_opts.use_uid ? befs_sb->mount_opts.uid : (uid_t) fs32_to_cpu(sb, raw_inode->uid); inode->i_gid = befs_sb->mount_opts.use_gid ? befs_sb->mount_opts.gid : (gid_t) fs32_to_cpu(sb, raw_inode->gid); inode->i_nlink = 1; /* * BEFS's time is 64 bits, but current VFS is 32 bits... * BEFS don't have access time. Nor inode change time. VFS * doesn't have creation time. * Also, the lower 16 bits of the last_modified_time and * create_time are just a counter to help ensure uniqueness * for indexing purposes. (PFD, page 54) */ inode->i_mtime.tv_sec = fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16; inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */ inode->i_ctime = inode->i_mtime; inode->i_atime = inode->i_mtime; befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num); befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent); befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes); befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags); if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){ inode->i_size = 0; inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE; strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink, BEFS_SYMLINK_LEN); } else { int num_blks; befs_ino->i_data.ds = fsds_to_cpu(sb, raw_inode->data.datastream); num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds); inode->i_blocks = num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE); inode->i_size = befs_ino->i_data.ds.size; } inode->i_mapping->a_ops = &befs_aops; if (S_ISREG(inode->i_mode)) { inode->i_fop = &generic_ro_fops; } else if (S_ISDIR(inode->i_mode)) { inode->i_op = &befs_dir_inode_operations; inode->i_fop = &befs_dir_operations; } else if (S_ISLNK(inode->i_mode)) { inode->i_op = &befs_symlink_inode_operations; } else { befs_error(sb, "Inode %lu is not a regular file, " "directory or symlink. THAT IS WRONG! BeFS has no " "on disk special files", inode->i_ino); goto unacquire_bh; } brelse(bh); befs_debug(sb, "<--- befs_read_inode()"); return; unacquire_bh: brelse(bh); unacquire_none: make_bad_inode(inode); befs_debug(sb, "<--- befs_read_inode() - Bad inode"); return; } /* Initialize the inode cache. Called at fs setup. * * Taken from NFS implementation by Al Viro. */ static int befs_init_inodecache(void) { befs_inode_cachep = kmem_cache_create("befs_inode_cache", sizeof (struct befs_inode_info), 0, (SLAB_RECLAIM_ACCOUNT| SLAB_MEM_SPREAD), init_once, NULL); if (befs_inode_cachep == NULL) { printk(KERN_ERR "befs_init_inodecache: " "Couldn't initalize inode slabcache\n"); return -ENOMEM; } return 0; } /* Called at fs teardown. * * Taken from NFS implementation by Al Viro. */ static void befs_destroy_inodecache(void) { kmem_cache_destroy(befs_inode_cachep); } /* * The inode of symbolic link is different to data stream. * The data stream become link name. Unless the LONG_SYMLINK * flag is set. */ static void * befs_follow_link(struct dentry *dentry, struct nameidata *nd) { befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); char *link; if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { struct super_block *sb = dentry->d_sb; befs_data_stream *data = &befs_ino->i_data.ds; befs_off_t len = data->size; befs_debug(sb, "Follow long symlink"); link = kmalloc(len, GFP_NOFS); if (!link) { link = ERR_PTR(-ENOMEM); } else if (befs_read_lsymlink(sb, data, link, len) != len) { kfree(link); befs_error(sb, "Failed to read entire long symlink"); link = ERR_PTR(-EIO); } } else { link = befs_ino->i_data.symlink; } nd_set_link(nd, link); return NULL; } static void befs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) { befs_inode_info *befs_ino = BEFS_I(dentry->d_inode); if (befs_ino->i_flags & BEFS_LONG_SYMLINK) { char *p = nd_get_link(nd); if (!IS_ERR(p)) kfree(p); } } /* * UTF-8 to NLS charset convert routine * * * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than * the nls tables directly */ static int befs_utf2nls(struct super_block *sb, const char *in, int in_len, char **out, int *out_len) { struct nls_table *nls = BEFS_SB(sb)->nls; int i, o; wchar_t uni; int unilen, utflen; char *result; /* The utf8->nls conversion won't make the final nls string bigger * than the utf one, but if the string is pure ascii they'll have the * same width and an extra char is needed to save the additional \0 */ int maxlen = in_len + 1; befs_debug(sb, "---> utf2nls()"); if (!nls) { befs_error(sb, "befs_utf2nls called with no NLS table loaded"); return -EINVAL; } *out = result = kmalloc(maxlen, GFP_NOFS); if (!*out) { befs_error(sb, "befs_utf2nls() cannot allocate memory"); *out_len = 0; return -ENOMEM; } for (i = o = 0; i < in_len; i += utflen, o += unilen) { /* convert from UTF-8 to Unicode */ utflen = utf8_mbtowc(&uni, &in[i], in_len - i); if (utflen < 0) { goto conv_err; } /* convert from Unicode to nls */ unilen = nls->uni2char(uni, &result[o], in_len - o); if (unilen < 0) { goto conv_err; } } result[o] = '\0'; *out_len = o; befs_debug(sb, "<--- utf2nls()"); return o; conv_err: befs_error(sb, "Name using character set %s contains a character that " "cannot be converted to unicode.", nls->charset); befs_debug(sb, "<--- utf2nls()"); kfree(result); return -EILSEQ; } /** * befs_nls2utf - Convert NLS string to utf8 encodeing * @sb: Superblock * @src: Input string buffer in NLS format * @srclen: Length of input string in bytes * @dest: The output string in UTF-8 format * @destlen: Length of the output buffer * * Converts input string @src, which is in the format of the loaded NLS map, * into a utf8 string. * * The destination string @dest is allocated by this function and the caller is * responsible for freeing it with kfree() * * On return, *@destlen is the length of @dest in bytes. * * On success, the return value is the number of utf8 characters written to * the output buffer @dest. * * On Failure, a negative number coresponding to the error code is returned. */ static int befs_nls2utf(struct super_block *sb, const char *in, int in_len, char **out, int *out_len) { struct nls_table *nls = BEFS_SB(sb)->nls; int i, o; wchar_t uni; int unilen, utflen; char *result; /* There're nls characters that will translate to 3-chars-wide UTF-8 * characters, a additional byte is needed to save the final \0 * in special cases */ int maxlen = (3 * in_len) + 1; befs_debug(sb, "---> nls2utf()\n"); if (!nls) { befs_error(sb, "befs_nls2utf called with no NLS table loaded."); return -EINVAL; } *out = result = kmalloc(maxlen, GFP_NOFS); if (!*out) { befs_error(sb, "befs_nls2utf() cannot allocate memory"); *out_len = 0; return -ENOMEM; } for (i = o = 0; i < in_len; i += unilen, o += utflen) { /* convert from nls to unicode */ unilen = nls->char2uni(&in[i], in_len - i, &uni); if (unilen < 0) { goto conv_err; } /* convert from unicode to UTF-8 */ utflen = utf8_wctomb(&result[o], uni, 3); if (utflen <= 0) { goto conv_err; } } result[o] = '\0'; *out_len = o; befs_debug(sb, "<--- nls2utf()"); return i; conv_err: befs_error(sb, "Name using charecter set %s contains a charecter that " "cannot be converted to unicode.", nls->charset); befs_debug(sb, "<--- nls2utf()"); kfree(result); return -EILSEQ; } /** * Use the * */ enum { Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err, }; static match_table_t befs_tokens = { {Opt_uid, "uid=%d"}, {Opt_gid, "gid=%d"}, {Opt_charset, "iocharset=%s"}, {Opt_debug, "debug"}, {Opt_err, NULL} }; static int parse_options(char *options, befs_mount_options * opts) { char *p; substring_t args[MAX_OPT_ARGS]; int option; /* Initialize options */ opts->uid = 0; opts->gid = 0; opts->use_uid = 0; opts->use_gid = 0; opts->iocharset = NULL; opts->debug = 0; if (!options) return 1; while ((p = strsep(&options, ",")) != NULL) { int token; if (!*p) continue; token = match_token(p, befs_tokens, args); switch (token) { case Opt_uid: if (match_int(&args[0], &option)) return 0; if (option < 0) { printk(KERN_ERR "BeFS: Invalid uid %d, " "using default\n", option); break; } opts->uid = option; opts->use_uid = 1; break; case Opt_gid: if (match_int(&args[0], &option)) return 0; if (option < 0) { printk(KERN_ERR "BeFS: Invalid gid %d, " "using default\n", option); break; } opts->gid = option; opts->use_gid = 1; break; case Opt_charset: kfree(opts->iocharset); opts->iocharset = match_strdup(&args[0]); if (!opts->iocharset) { printk(KERN_ERR "BeFS: allocation failure for " "iocharset string\n"); return 0; } break; case Opt_debug: opts->debug = 1; break; default: printk(KERN_ERR "BeFS: Unrecognized mount option \"%s\" " "or missing value\n", p); return 0; } } return 1; } /* This function has the responsibiltiy of getting the * filesystem ready for unmounting. * Basicly, we free everything that we allocated in * befs_read_inode */ static void befs_put_super(struct super_block *sb) { kfree(BEFS_SB(sb)->mount_opts.iocharset); BEFS_SB(sb)->mount_opts.iocharset = NULL; if (BEFS_SB(sb)->nls) { unload_nls(BEFS_SB(sb)->nls); BEFS_SB(sb)->nls = NULL; } kfree(sb->s_fs_info); sb->s_fs_info = NULL; return; } /* Allocate private field of the superblock, fill it. * * Finish filling the public superblock fields * Make the root directory * Load a set of NLS translations if needed. */ static int befs_fill_super(struct super_block *sb, void *data, int silent) { struct buffer_head *bh; befs_sb_info *befs_sb; befs_super_block *disk_sb; struct inode *root; const unsigned long sb_block = 0; const off_t x86_sb_off = 512; sb->s_fs_info = kmalloc(sizeof (*befs_sb), GFP_KERNEL); if (sb->s_fs_info == NULL) { printk(KERN_ERR "BeFS(%s): Unable to allocate memory for private " "portion of superblock. Bailing.\n", sb->s_id); goto unacquire_none; } befs_sb = BEFS_SB(sb); memset(befs_sb, 0, sizeof(befs_sb_info)); if (!parse_options((char *) data, &befs_sb->mount_opts)) { befs_error(sb, "cannot parse mount options"); goto unacquire_priv_sbp; } befs_debug(sb, "---> befs_fill_super()"); #ifndef CONFIG_BEFS_RW if (!(sb->s_flags & MS_RDONLY)) { befs_warning(sb, "No write support. Marking filesystem read-only"); sb->s_flags |= MS_RDONLY; } #endif /* CONFIG_BEFS_RW */ /* * Set dummy blocksize to read super block. * Will be set to real fs blocksize later. * * Linux 2.4.10 and later refuse to read blocks smaller than * the hardsect size for the device. But we also need to read at * least 1k to get the second 512 bytes of the volume. * -WD 10-26-01 */ sb_min_blocksize(sb, 1024); if (!(bh = sb_bread(sb, sb_block))) { befs_error(sb, "unable to read superblock"); goto unacquire_priv_sbp; } /* account for offset of super block on x86 */ disk_sb = (befs_super_block *) bh->b_data; if ((le32_to_cpu(disk_sb->magic1) == BEFS_SUPER_MAGIC1) || (be32_to_cpu(disk_sb->magic1) == BEFS_SUPER_MAGIC1)) { befs_debug(sb, "Using PPC superblock location"); } else { befs_debug(sb, "Using x86 superblock location"); disk_sb = (befs_super_block *) ((void *) bh->b_data + x86_sb_off); } if (befs_load_sb(sb, disk_sb) != BEFS_OK) goto unacquire_bh; befs_dump_super_block(sb, disk_sb); brelse(bh); if (befs_check_sb(sb) != BEFS_OK) goto unacquire_priv_sbp; if( befs_sb->num_blocks > ~((sector_t)0) ) { befs_error(sb, "blocks count: %Lu " "is larger than the host can use", befs_sb->num_blocks); goto unacquire_priv_sbp; } /* * set up enough so that it can read an inode * Fill in kernel superblock fields from private sb */ sb->s_magic = BEFS_SUPER_MAGIC; /* Set real blocksize of fs */ sb_set_blocksize(sb, (ulong) befs_sb->block_size); sb->s_op = (struct super_operations *) &befs_sops; root = iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir))); sb->s_root = d_alloc_root(root); if (!sb->s_root) { iput(root); befs_error(sb, "get root inode failed"); goto unacquire_priv_sbp; } /* load nls library */ if (befs_sb->mount_opts.iocharset) { befs_debug(sb, "Loading nls: %s", befs_sb->mount_opts.iocharset); befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset); if (!befs_sb->nls) { befs_warning(sb, "Cannot load nls %s" " loading default nls", befs_sb->mount_opts.iocharset); befs_sb->nls = load_nls_default(); } /* load default nls if none is specified in mount options */ } else { befs_debug(sb, "Loading default nls"); befs_sb->nls = load_nls_default(); } return 0; /*****************/ unacquire_bh: brelse(bh); unacquire_priv_sbp: kfree(sb->s_fs_info); unacquire_none: sb->s_fs_info = NULL; return -EINVAL; } static int befs_remount(struct super_block *sb, int *flags, char *data) { if (!(*flags & MS_RDONLY)) return -EINVAL; return 0; } static int befs_statfs(struct dentry *dentry, struct kstatfs *buf) { struct super_block *sb = dentry->d_sb; befs_debug(sb, "---> befs_statfs()"); buf->f_type = BEFS_SUPER_MAGIC; buf->f_bsize = sb->s_blocksize; buf->f_blocks = BEFS_SB(sb)->num_blocks; buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks; buf->f_bavail = buf->f_bfree; buf->f_files = 0; /* UNKNOWN */ buf->f_ffree = 0; /* UNKNOWN */ buf->f_namelen = BEFS_NAME_LEN; befs_debug(sb, "<--- befs_statfs()"); return 0; } static int befs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *data, struct vfsmount *mnt) { return get_sb_bdev(fs_type, flags, dev_name, data, befs_fill_super, mnt); } static struct file_system_type befs_fs_type = { .owner = THIS_MODULE, .name = "befs", .get_sb = befs_get_sb, .kill_sb = kill_block_super, .fs_flags = FS_REQUIRES_DEV, }; static int __init init_befs_fs(void) { int err; printk(KERN_INFO "BeFS version: %s\n", BEFS_VERSION); err = befs_init_inodecache(); if (err) goto unacquire_none; err = register_filesystem(&befs_fs_type); if (err) goto unacquire_inodecache; return 0; unacquire_inodecache: befs_destroy_inodecache(); unacquire_none: return err; } static void __exit exit_befs_fs(void) { befs_destroy_inodecache(); unregister_filesystem(&befs_fs_type); } /* Macros that typecheck the init and exit functions, ensures that they are called at init and cleanup, and eliminates warnings about unused functions. */ module_init(init_befs_fs) module_exit(exit_befs_fs)