inode.c 17.7 KB
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/*
  FUSE: Filesystem in Userspace
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  Copyright (C) 2001-2006  Miklos Szeredi <miklos@szeredi.hu>
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  This program can be distributed under the terms of the GNU GPL.
  See the file COPYING.
*/

#include "fuse_i.h"

#include <linux/pagemap.h>
#include <linux/slab.h>
#include <linux/file.h>
#include <linux/seq_file.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/parser.h>
#include <linux/statfs.h>
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#include <linux/random.h>
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MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
MODULE_DESCRIPTION("Filesystem in Userspace");
MODULE_LICENSE("GPL");

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static struct kmem_cache *fuse_inode_cachep;
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struct list_head fuse_conn_list;
DEFINE_MUTEX(fuse_mutex);
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#define FUSE_SUPER_MAGIC 0x65735546

struct fuse_mount_data {
	int fd;
	unsigned rootmode;
	unsigned user_id;
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	unsigned group_id;
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	unsigned fd_present : 1;
	unsigned rootmode_present : 1;
	unsigned user_id_present : 1;
	unsigned group_id_present : 1;
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	unsigned flags;
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	unsigned max_read;
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	unsigned blksize;
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};

static struct inode *fuse_alloc_inode(struct super_block *sb)
{
	struct inode *inode;
	struct fuse_inode *fi;

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	inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL);
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	if (!inode)
		return NULL;

	fi = get_fuse_inode(inode);
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	fi->i_time = 0;
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	fi->nodeid = 0;
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	fi->nlookup = 0;
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	fi->forget_req = fuse_request_alloc();
	if (!fi->forget_req) {
		kmem_cache_free(fuse_inode_cachep, inode);
		return NULL;
	}
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	return inode;
}

static void fuse_destroy_inode(struct inode *inode)
{
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	struct fuse_inode *fi = get_fuse_inode(inode);
	if (fi->forget_req)
		fuse_request_free(fi->forget_req);
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	kmem_cache_free(fuse_inode_cachep, inode);
}

static void fuse_read_inode(struct inode *inode)
{
	/* No op */
}

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void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
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		      unsigned long nodeid, u64 nlookup)
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{
	struct fuse_forget_in *inarg = &req->misc.forget_in;
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	inarg->nlookup = nlookup;
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	req->in.h.opcode = FUSE_FORGET;
	req->in.h.nodeid = nodeid;
	req->in.numargs = 1;
	req->in.args[0].size = sizeof(struct fuse_forget_in);
	req->in.args[0].value = inarg;
	request_send_noreply(fc, req);
}

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static void fuse_clear_inode(struct inode *inode)
{
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	if (inode->i_sb->s_flags & MS_ACTIVE) {
		struct fuse_conn *fc = get_fuse_conn(inode);
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		struct fuse_inode *fi = get_fuse_inode(inode);
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		fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup);
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		fi->forget_req = NULL;
	}
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}

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static int fuse_remount_fs(struct super_block *sb, int *flags, char *data)
{
	if (*flags & MS_MANDLOCK)
		return -EINVAL;

	return 0;
}

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void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr)
{
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	struct fuse_conn *fc = get_fuse_conn(inode);
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	if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size)
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		invalidate_mapping_pages(inode->i_mapping, 0, -1);
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	inode->i_ino     = attr->ino;
	inode->i_mode    = (inode->i_mode & S_IFMT) + (attr->mode & 07777);
	inode->i_nlink   = attr->nlink;
	inode->i_uid     = attr->uid;
	inode->i_gid     = attr->gid;
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	spin_lock(&fc->lock);
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	i_size_write(inode, attr->size);
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	spin_unlock(&fc->lock);
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	inode->i_blocks  = attr->blocks;
	inode->i_atime.tv_sec   = attr->atime;
	inode->i_atime.tv_nsec  = attr->atimensec;
	inode->i_mtime.tv_sec   = attr->mtime;
	inode->i_mtime.tv_nsec  = attr->mtimensec;
	inode->i_ctime.tv_sec   = attr->ctime;
	inode->i_ctime.tv_nsec  = attr->ctimensec;
}

static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
{
	inode->i_mode = attr->mode & S_IFMT;
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	inode->i_size = attr->size;
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	if (S_ISREG(inode->i_mode)) {
		fuse_init_common(inode);
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		fuse_init_file_inode(inode);
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	} else if (S_ISDIR(inode->i_mode))
		fuse_init_dir(inode);
	else if (S_ISLNK(inode->i_mode))
		fuse_init_symlink(inode);
	else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
		 S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
		fuse_init_common(inode);
		init_special_inode(inode, inode->i_mode,
				   new_decode_dev(attr->rdev));
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	} else
		BUG();
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}

static int fuse_inode_eq(struct inode *inode, void *_nodeidp)
{
	unsigned long nodeid = *(unsigned long *) _nodeidp;
	if (get_node_id(inode) == nodeid)
		return 1;
	else
		return 0;
}

static int fuse_inode_set(struct inode *inode, void *_nodeidp)
{
	unsigned long nodeid = *(unsigned long *) _nodeidp;
	get_fuse_inode(inode)->nodeid = nodeid;
	return 0;
}

struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
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			int generation, struct fuse_attr *attr)
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{
	struct inode *inode;
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	struct fuse_inode *fi;
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	struct fuse_conn *fc = get_fuse_conn_super(sb);

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	inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid);
	if (!inode)
		return NULL;

	if ((inode->i_state & I_NEW)) {
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		inode->i_flags |= S_NOATIME|S_NOCMTIME;
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		inode->i_generation = generation;
		inode->i_data.backing_dev_info = &fc->bdi;
		fuse_init_inode(inode, attr);
		unlock_new_inode(inode);
	} else if ((inode->i_mode ^ attr->mode) & S_IFMT) {
		/* Inode has changed type, any I/O on the old should fail */
		make_bad_inode(inode);
		iput(inode);
		goto retry;
	}

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	fi = get_fuse_inode(inode);
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	spin_lock(&fc->lock);
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	fi->nlookup ++;
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	spin_unlock(&fc->lock);
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	fuse_change_attributes(inode, attr);
	return inode;
}

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static void fuse_umount_begin(struct vfsmount *vfsmnt, int flags)
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{
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	if (flags & MNT_FORCE)
		fuse_abort_conn(get_fuse_conn_super(vfsmnt->mnt_sb));
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}

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static void fuse_send_destroy(struct fuse_conn *fc)
{
	struct fuse_req *req = fc->destroy_req;
	if (req && fc->conn_init) {
		fc->destroy_req = NULL;
		req->in.h.opcode = FUSE_DESTROY;
		req->force = 1;
		request_send(fc, req);
		fuse_put_request(fc, req);
	}
}

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static void fuse_put_super(struct super_block *sb)
{
	struct fuse_conn *fc = get_fuse_conn_super(sb);

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	fuse_send_destroy(fc);
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	spin_lock(&fc->lock);
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	fc->connected = 0;
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	fc->blocked = 0;
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	spin_unlock(&fc->lock);
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	/* Flush all readers on this fs */
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	kill_fasync(&fc->fasync, SIGIO, POLL_IN);
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	wake_up_all(&fc->waitq);
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	wake_up_all(&fc->blocked_waitq);
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	mutex_lock(&fuse_mutex);
	list_del(&fc->entry);
	fuse_ctl_remove_conn(fc);
	mutex_unlock(&fuse_mutex);
	fuse_conn_put(fc);
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}

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static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
{
	stbuf->f_type    = FUSE_SUPER_MAGIC;
	stbuf->f_bsize   = attr->bsize;
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	stbuf->f_frsize  = attr->frsize;
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	stbuf->f_blocks  = attr->blocks;
	stbuf->f_bfree   = attr->bfree;
	stbuf->f_bavail  = attr->bavail;
	stbuf->f_files   = attr->files;
	stbuf->f_ffree   = attr->ffree;
	stbuf->f_namelen = attr->namelen;
	/* fsid is left zero */
}

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static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
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{
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	struct super_block *sb = dentry->d_sb;
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	struct fuse_conn *fc = get_fuse_conn_super(sb);
	struct fuse_req *req;
	struct fuse_statfs_out outarg;
	int err;

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	req = fuse_get_req(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);
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	memset(&outarg, 0, sizeof(outarg));
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	req->in.numargs = 0;
	req->in.h.opcode = FUSE_STATFS;
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	req->in.h.nodeid = get_node_id(dentry->d_inode);
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	req->out.numargs = 1;
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	req->out.args[0].size =
		fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg);
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	req->out.args[0].value = &outarg;
	request_send(fc, req);
	err = req->out.h.error;
	if (!err)
		convert_fuse_statfs(buf, &outarg.st);
	fuse_put_request(fc, req);
	return err;
}

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enum {
	OPT_FD,
	OPT_ROOTMODE,
	OPT_USER_ID,
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	OPT_GROUP_ID,
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	OPT_DEFAULT_PERMISSIONS,
	OPT_ALLOW_OTHER,
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	OPT_MAX_READ,
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	OPT_BLKSIZE,
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	OPT_ERR
};

static match_table_t tokens = {
	{OPT_FD,			"fd=%u"},
	{OPT_ROOTMODE,			"rootmode=%o"},
	{OPT_USER_ID,			"user_id=%u"},
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	{OPT_GROUP_ID,			"group_id=%u"},
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	{OPT_DEFAULT_PERMISSIONS,	"default_permissions"},
	{OPT_ALLOW_OTHER,		"allow_other"},
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	{OPT_MAX_READ,			"max_read=%u"},
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	{OPT_BLKSIZE,			"blksize=%u"},
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	{OPT_ERR,			NULL}
};

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static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev)
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{
	char *p;
	memset(d, 0, sizeof(struct fuse_mount_data));
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	d->max_read = ~0;
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	d->blksize = 512;
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	while ((p = strsep(&opt, ",")) != NULL) {
		int token;
		int value;
		substring_t args[MAX_OPT_ARGS];
		if (!*p)
			continue;

		token = match_token(p, tokens, args);
		switch (token) {
		case OPT_FD:
			if (match_int(&args[0], &value))
				return 0;
			d->fd = value;
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			d->fd_present = 1;
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			break;

		case OPT_ROOTMODE:
			if (match_octal(&args[0], &value))
				return 0;
			d->rootmode = value;
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			d->rootmode_present = 1;
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			break;

		case OPT_USER_ID:
			if (match_int(&args[0], &value))
				return 0;
			d->user_id = value;
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			d->user_id_present = 1;
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			break;

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		case OPT_GROUP_ID:
			if (match_int(&args[0], &value))
				return 0;
			d->group_id = value;
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			d->group_id_present = 1;
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			break;

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		case OPT_DEFAULT_PERMISSIONS:
			d->flags |= FUSE_DEFAULT_PERMISSIONS;
			break;

		case OPT_ALLOW_OTHER:
			d->flags |= FUSE_ALLOW_OTHER;
			break;

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		case OPT_MAX_READ:
			if (match_int(&args[0], &value))
				return 0;
			d->max_read = value;
			break;

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		case OPT_BLKSIZE:
			if (!is_bdev || match_int(&args[0], &value))
				return 0;
			d->blksize = value;
			break;

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		default:
			return 0;
		}
	}
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	if (!d->fd_present || !d->rootmode_present ||
	    !d->user_id_present || !d->group_id_present)
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		return 0;

	return 1;
}

static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt)
{
	struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb);

	seq_printf(m, ",user_id=%u", fc->user_id);
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	seq_printf(m, ",group_id=%u", fc->group_id);
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	if (fc->flags & FUSE_DEFAULT_PERMISSIONS)
		seq_puts(m, ",default_permissions");
	if (fc->flags & FUSE_ALLOW_OTHER)
		seq_puts(m, ",allow_other");
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	if (fc->max_read != ~0)
		seq_printf(m, ",max_read=%u", fc->max_read);
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	return 0;
}

static struct fuse_conn *new_conn(void)
{
	struct fuse_conn *fc;

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	fc = kzalloc(sizeof(*fc), GFP_KERNEL);
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	if (fc) {
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		spin_lock_init(&fc->lock);
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		mutex_init(&fc->inst_mutex);
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		atomic_set(&fc->count, 1);
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		init_waitqueue_head(&fc->waitq);
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		init_waitqueue_head(&fc->blocked_waitq);
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		INIT_LIST_HEAD(&fc->pending);
		INIT_LIST_HEAD(&fc->processing);
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		INIT_LIST_HEAD(&fc->io);
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		INIT_LIST_HEAD(&fc->interrupts);
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		atomic_set(&fc->num_waiting, 0);
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		fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
		fc->bdi.unplug_io_fn = default_unplug_io_fn;
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		fc->reqctr = 0;
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		fc->blocked = 1;
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		get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
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	}
	return fc;
}

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void fuse_conn_put(struct fuse_conn *fc)
{
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	if (atomic_dec_and_test(&fc->count)) {
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		if (fc->destroy_req)
			fuse_request_free(fc->destroy_req);
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		mutex_destroy(&fc->inst_mutex);
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		kfree(fc);
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	}
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}

struct fuse_conn *fuse_conn_get(struct fuse_conn *fc)
{
	atomic_inc(&fc->count);
	return fc;
}

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static struct inode *get_root_inode(struct super_block *sb, unsigned mode)
{
	struct fuse_attr attr;
	memset(&attr, 0, sizeof(attr));

	attr.mode = mode;
	attr.ino = FUSE_ROOT_ID;
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	return fuse_iget(sb, 1, 0, &attr);
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}

static struct super_operations fuse_super_operations = {
	.alloc_inode    = fuse_alloc_inode,
	.destroy_inode  = fuse_destroy_inode,
	.read_inode	= fuse_read_inode,
	.clear_inode	= fuse_clear_inode,
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	.remount_fs	= fuse_remount_fs,
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	.put_super	= fuse_put_super,
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	.umount_begin	= fuse_umount_begin,
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	.statfs		= fuse_statfs,
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	.show_options	= fuse_show_options,
};

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static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
{
	struct fuse_init_out *arg = &req->misc.init_out;

	if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
		fc->conn_error = 1;
	else {
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		unsigned long ra_pages;

		if (arg->minor >= 6) {
			ra_pages = arg->max_readahead / PAGE_CACHE_SIZE;
			if (arg->flags & FUSE_ASYNC_READ)
				fc->async_read = 1;
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			if (!(arg->flags & FUSE_POSIX_LOCKS))
				fc->no_lock = 1;
		} else {
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			ra_pages = fc->max_read / PAGE_CACHE_SIZE;
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			fc->no_lock = 1;
		}
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		fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages);
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		fc->minor = arg->minor;
		fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
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		fc->conn_init = 1;
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	}
	fuse_put_request(fc, req);
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	fc->blocked = 0;
	wake_up_all(&fc->blocked_waitq);
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}

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static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
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{
	struct fuse_init_in *arg = &req->misc.init_in;
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	arg->major = FUSE_KERNEL_VERSION;
	arg->minor = FUSE_KERNEL_MINOR_VERSION;
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	arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE;
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	arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS;
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	req->in.h.opcode = FUSE_INIT;
	req->in.numargs = 1;
	req->in.args[0].size = sizeof(*arg);
	req->in.args[0].value = arg;
	req->out.numargs = 1;
	/* Variable length arguement used for backward compatibility
	   with interface version < 7.5.  Rest of init_out is zeroed
	   by do_get_request(), so a short reply is not a problem */
	req->out.argvar = 1;
	req->out.args[0].size = sizeof(struct fuse_init_out);
	req->out.args[0].value = &req->misc.init_out;
	req->end = process_init_reply;
	request_send_background(fc, req);
}

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static u64 conn_id(void)
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{
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	static u64 ctr = 1;
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	return ctr++;
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}

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static int fuse_fill_super(struct super_block *sb, void *data, int silent)
{
	struct fuse_conn *fc;
	struct inode *root;
	struct fuse_mount_data d;
	struct file *file;
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	struct dentry *root_dentry;
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	struct fuse_req *init_req;
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	int err;
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	int is_bdev = sb->s_bdev != NULL;
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	if (sb->s_flags & MS_MANDLOCK)
		return -EINVAL;

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	if (!parse_fuse_opt((char *) data, &d, is_bdev))
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		return -EINVAL;

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	if (is_bdev) {
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#ifdef CONFIG_BLOCK
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		if (!sb_set_blocksize(sb, d.blksize))
			return -EINVAL;
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#endif
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	} else {
		sb->s_blocksize = PAGE_CACHE_SIZE;
		sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
	}
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	sb->s_magic = FUSE_SUPER_MAGIC;
	sb->s_op = &fuse_super_operations;
	sb->s_maxbytes = MAX_LFS_FILESIZE;

	file = fget(d.fd);
	if (!file)
		return -EINVAL;

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	if (file->f_op != &fuse_dev_operations)
		return -EINVAL;

	fc = new_conn();
	if (!fc)
		return -ENOMEM;
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	fc->flags = d.flags;
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	fc->user_id = d.user_id;
563
	fc->group_id = d.group_id;
564
	fc->max_read = d.max_read;
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566 567 568
	/* Used by get_root_inode() */
	sb->s_fs_info = fc;

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	err = -ENOMEM;
	root = get_root_inode(sb, d.rootmode);
571
	if (!root)
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		goto err;

574 575
	root_dentry = d_alloc_root(root);
	if (!root_dentry) {
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		iput(root);
		goto err;
	}
579

580 581 582 583
	init_req = fuse_request_alloc();
	if (!init_req)
		goto err_put_root;

584 585 586 587 588 589
	if (is_bdev) {
		fc->destroy_req = fuse_request_alloc();
		if (!fc->destroy_req)
			goto err_put_root;
	}

590
	mutex_lock(&fuse_mutex);
591 592
	err = -EINVAL;
	if (file->private_data)
593
		goto err_unlock;
594

595 596 597 598 599 600
	fc->id = conn_id();
	err = fuse_ctl_add_conn(fc);
	if (err)
		goto err_unlock;

	list_add_tail(&fc->entry, &fuse_conn_list);
601 602
	sb->s_root = root_dentry;
	fc->connected = 1;
603 604
	file->private_data = fuse_conn_get(fc);
	mutex_unlock(&fuse_mutex);
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	/*
	 * atomic_dec_and_test() in fput() provides the necessary
	 * memory barrier for file->private_data to be visible on all
	 * CPUs after this
	 */
	fput(file);
611

612
	fuse_send_init(fc, init_req);
613

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	return 0;

616 617
 err_unlock:
	mutex_unlock(&fuse_mutex);
618
	fuse_request_free(init_req);
619 620
 err_put_root:
	dput(root_dentry);
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 err:
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	fput(file);
623
	fuse_conn_put(fc);
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	return err;
}

627 628 629
static int fuse_get_sb(struct file_system_type *fs_type,
		       int flags, const char *dev_name,
		       void *raw_data, struct vfsmount *mnt)
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{
631
	return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super, mnt);
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}

634 635 636 637 638 639 640 641
static struct file_system_type fuse_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "fuse",
	.get_sb		= fuse_get_sb,
	.kill_sb	= kill_anon_super,
};

#ifdef CONFIG_BLOCK
642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657
static int fuse_get_sb_blk(struct file_system_type *fs_type,
			   int flags, const char *dev_name,
			   void *raw_data, struct vfsmount *mnt)
{
	return get_sb_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super,
			   mnt);
}

static struct file_system_type fuseblk_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "fuseblk",
	.get_sb		= fuse_get_sb_blk,
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};

658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677
static inline int register_fuseblk(void)
{
	return register_filesystem(&fuseblk_fs_type);
}

static inline void unregister_fuseblk(void)
{
	unregister_filesystem(&fuseblk_fs_type);
}
#else
static inline int register_fuseblk(void)
{
	return 0;
}

static inline void unregister_fuseblk(void)
{
}
#endif

678
static decl_subsys(fuse, NULL, NULL);
679
static decl_subsys(connections, NULL, NULL);
680

681
static void fuse_inode_init_once(void *foo, struct kmem_cache *cachep,
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				 unsigned long flags)
{
	struct inode * inode = foo;

	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
	    SLAB_CTOR_CONSTRUCTOR)
		inode_init_once(inode);
}

static int __init fuse_fs_init(void)
{
	int err;

	err = register_filesystem(&fuse_fs_type);
	if (err)
697 698
		goto out;

699
	err = register_fuseblk();
700 701 702 703 704 705 706 707 708 709 710 711
	if (err)
		goto out_unreg;

	fuse_inode_cachep = kmem_cache_create("fuse_inode",
					      sizeof(struct fuse_inode),
					      0, SLAB_HWCACHE_ALIGN,
					      fuse_inode_init_once, NULL);
	err = -ENOMEM;
	if (!fuse_inode_cachep)
		goto out_unreg2;

	return 0;
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713
 out_unreg2:
714
	unregister_fuseblk();
715 716 717
 out_unreg:
	unregister_filesystem(&fuse_fs_type);
 out:
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	return err;
}

static void fuse_fs_cleanup(void)
{
	unregister_filesystem(&fuse_fs_type);
724
	unregister_fuseblk();
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	kmem_cache_destroy(fuse_inode_cachep);
}

728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755
static int fuse_sysfs_init(void)
{
	int err;

	kset_set_kset_s(&fuse_subsys, fs_subsys);
	err = subsystem_register(&fuse_subsys);
	if (err)
		goto out_err;

	kset_set_kset_s(&connections_subsys, fuse_subsys);
	err = subsystem_register(&connections_subsys);
	if (err)
		goto out_fuse_unregister;

	return 0;

 out_fuse_unregister:
	subsystem_unregister(&fuse_subsys);
 out_err:
	return err;
}

static void fuse_sysfs_cleanup(void)
{
	subsystem_unregister(&connections_subsys);
	subsystem_unregister(&fuse_subsys);
}

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static int __init fuse_init(void)
{
	int res;

	printk("fuse init (API version %i.%i)\n",
	       FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);

763
	INIT_LIST_HEAD(&fuse_conn_list);
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	res = fuse_fs_init();
	if (res)
		goto err;

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	res = fuse_dev_init();
	if (res)
		goto err_fs_cleanup;

772 773 774 775
	res = fuse_sysfs_init();
	if (res)
		goto err_dev_cleanup;

776 777 778 779
	res = fuse_ctl_init();
	if (res)
		goto err_sysfs_cleanup;

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	return 0;

782 783
 err_sysfs_cleanup:
	fuse_sysfs_cleanup();
784 785
 err_dev_cleanup:
	fuse_dev_cleanup();
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 err_fs_cleanup:
	fuse_fs_cleanup();
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 err:
	return res;
}

static void __exit fuse_exit(void)
{
	printk(KERN_DEBUG "fuse exit\n");

796
	fuse_ctl_cleanup();
797
	fuse_sysfs_cleanup();
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	fuse_fs_cleanup();
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	fuse_dev_cleanup();
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}

module_init(fuse_init);
module_exit(fuse_exit);