[linux.git] / fs / fuse / inode.c

/*
  FUSE: Filesystem in Userspace
  Copyright (C) 2001-2005  Miklos Szeredi <[email protected]>

  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/mount.h>
#include <linux/seq_file.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/parser.h>
#include <linux/statfs.h>

MODULE_AUTHOR("Miklos Szeredi <[email protected]>");
MODULE_DESCRIPTION("Filesystem in Userspace");
MODULE_LICENSE("GPL");

spinlock_t fuse_lock;
static kmem_cache_t *fuse_inode_cachep;
static int mount_count;

static int mount_max = 1000;
module_param(mount_max, int, 0644);
MODULE_PARM_DESC(mount_max, "Maximum number of FUSE mounts allowed, if -1 then unlimited (default: 1000)");

#define FUSE_SUPER_MAGIC 0x65735546

struct fuse_mount_data {
	int fd;
	unsigned rootmode;
	unsigned user_id;
};

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

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

	fi = get_fuse_inode(inode);
	fi->i_time = jiffies - 1;
	fi->nodeid = 0;

	return inode;
}

static void fuse_destroy_inode(struct inode *inode)
{
	kmem_cache_free(fuse_inode_cachep, inode);
}

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

static void fuse_clear_inode(struct inode *inode)
{
}

void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr)
{
	if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size)
		invalidate_inode_pages(inode->i_mapping);

	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;
	i_size_write(inode, attr->size);
	inode->i_blksize = PAGE_CACHE_SIZE;
	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;
	i_size_write(inode, attr->size);
}

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,
			int generation, struct fuse_attr *attr, int version)
{
	struct inode *inode;
	struct fuse_conn *fc = get_fuse_conn_super(sb);
	int retried = 0;

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

	if ((inode->i_state & I_NEW)) {
		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) {
		BUG_ON(retried);
		/* Inode has changed type, any I/O on the old should fail */
		make_bad_inode(inode);
		iput(inode);
		retried = 1;
		goto retry;
	}

	fuse_change_attributes(inode, attr);
	inode->i_version = version;
	return inode;
}

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

	spin_lock(&fuse_lock);
	mount_count --;
	fc->sb = NULL;
	fc->user_id = 0;
	fuse_release_conn(fc);
	*get_fuse_conn_super_p(sb) = NULL;
	spin_unlock(&fuse_lock);
}

enum {
	OPT_FD,
	OPT_ROOTMODE,
	OPT_USER_ID,
	OPT_DEFAULT_PERMISSIONS,
	OPT_ALLOW_OTHER,
	OPT_ALLOW_ROOT,
	OPT_KERNEL_CACHE,
	OPT_ERR
};

static match_table_t tokens = {
	{OPT_FD,			"fd=%u"},
	{OPT_ROOTMODE,			"rootmode=%o"},
	{OPT_USER_ID,			"user_id=%u"},
	{OPT_DEFAULT_PERMISSIONS,	"default_permissions"},
	{OPT_ALLOW_OTHER,		"allow_other"},
	{OPT_ALLOW_ROOT,		"allow_root"},
	{OPT_KERNEL_CACHE,		"kernel_cache"},
	{OPT_ERR,			NULL}
};

static int parse_fuse_opt(char *opt, struct fuse_mount_data *d)
{
	char *p;
	memset(d, 0, sizeof(struct fuse_mount_data));
	d->fd = -1;

	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;
			break;

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

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

		default:
			return 0;
		}
	}
	if (d->fd == -1)
		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);
	return 0;
}

void fuse_release_conn(struct fuse_conn *fc)
{
	kfree(fc);
}

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

	fc = kmalloc(sizeof(*fc), GFP_KERNEL);
	if (fc != NULL) {
		memset(fc, 0, sizeof(*fc));
		fc->sb = NULL;
		fc->user_id = 0;
		fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
		fc->bdi.unplug_io_fn = default_unplug_io_fn;
	}
	return fc;
}

static struct fuse_conn *get_conn(struct file *file, struct super_block *sb)
{
	struct fuse_conn *fc;

	fc = new_conn();
	if (fc == NULL)
		return NULL;
	spin_lock(&fuse_lock);
	fc->sb = sb;
	spin_unlock(&fuse_lock);
	return fc;
}

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;
	return fuse_iget(sb, 1, 0, &attr, 0);
}

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,
	.put_super	= fuse_put_super,
	.show_options	= fuse_show_options,
};

static int inc_mount_count(void)
{
	int success = 0;
	spin_lock(&fuse_lock);
	mount_count ++;
	if (mount_max == -1 || mount_count <= mount_max)
		success = 1;
	spin_unlock(&fuse_lock);
	return success;
}

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;
	int err;

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

	sb->s_blocksize = PAGE_CACHE_SIZE;
	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
	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;

	fc = get_conn(file, sb);
	fput(file);
	if (fc == NULL)
		return -EINVAL;

	fc->user_id = d.user_id;

	*get_fuse_conn_super_p(sb) = fc;

	err = -ENFILE;
	if (!inc_mount_count() && current->uid != 0)
		goto err;

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

	sb->s_root = d_alloc_root(root);
	if (!sb->s_root) {
		iput(root);
		goto err;
	}
	return 0;

 err:
	spin_lock(&fuse_lock);
	mount_count --;
	fc->sb = NULL;
	fuse_release_conn(fc);
	spin_unlock(&fuse_lock);
	*get_fuse_conn_super_p(sb) = NULL;
	return err;
}

static struct super_block *fuse_get_sb(struct file_system_type *fs_type,
				       int flags, const char *dev_name,
				       void *raw_data)
{
	return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super);
}

static struct file_system_type fuse_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "fuse",
	.get_sb		= fuse_get_sb,
	.kill_sb	= kill_anon_super,
};

static void fuse_inode_init_once(void *foo, kmem_cache_t *cachep,
				 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)
		printk("fuse: failed to register filesystem\n");
	else {
		fuse_inode_cachep = kmem_cache_create("fuse_inode",
						      sizeof(struct fuse_inode),
						      0, SLAB_HWCACHE_ALIGN,
						      fuse_inode_init_once, NULL);
		if (!fuse_inode_cachep) {
			unregister_filesystem(&fuse_fs_type);
			err = -ENOMEM;
		}
	}

	return err;
}

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

static int __init fuse_init(void)
{
	int res;

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

	spin_lock_init(&fuse_lock);
	res = fuse_fs_init();
	if (res)
		goto err;

	return 0;

 err:
	return res;
}

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

	fuse_fs_cleanup();
}

module_init(fuse_init);
module_exit(fuse_exit);
Commit	Line	Data
d8a5ba45 MS	1	/*
	2	FUSE: Filesystem in Userspace
	3	Copyright (C) 2001-2005 Miklos Szeredi <[email protected]>
	4
	5	This program can be distributed under the terms of the GNU GPL.
	6	See the file COPYING.
	7	*/
	8
	9	#include "fuse_i.h"
	10
	11	#include <linux/pagemap.h>
	12	#include <linux/slab.h>
	13	#include <linux/file.h>
	14	#include <linux/mount.h>
	15	#include <linux/seq_file.h>
	16	#include <linux/init.h>
	17	#include <linux/module.h>
	18	#include <linux/moduleparam.h>
	19	#include <linux/parser.h>
	20	#include <linux/statfs.h>
	21
	22	MODULE_AUTHOR("Miklos Szeredi <[email protected]>");
	23	MODULE_DESCRIPTION("Filesystem in Userspace");
	24	MODULE_LICENSE("GPL");
	25
	26	spinlock_t fuse_lock;
	27	static kmem_cache_t *fuse_inode_cachep;
	28	static int mount_count;
	29
	30	static int mount_max = 1000;
	31	module_param(mount_max, int, 0644);
	32	MODULE_PARM_DESC(mount_max, "Maximum number of FUSE mounts allowed, if -1 then unlimited (default: 1000)");
	33
	34	#define FUSE_SUPER_MAGIC 0x65735546
	35
	36	struct fuse_mount_data {
	37	int fd;
	38	unsigned rootmode;
	39	unsigned user_id;
	40	};
	41
	42	static struct inode fuse_alloc_inode(struct super_block sb)
	43	{
	44	struct inode *inode;
	45	struct fuse_inode *fi;
	46
	47	inode = kmem_cache_alloc(fuse_inode_cachep, SLAB_KERNEL);
	48	if (!inode)
	49	return NULL;
	50
	51	fi = get_fuse_inode(inode);
	52	fi->i_time = jiffies - 1;
	53	fi->nodeid = 0;
	54
	55	return inode;
	56	}
	57
	58	static void fuse_destroy_inode(struct inode *inode)
	59	{
	60	kmem_cache_free(fuse_inode_cachep, inode);
	61	}
	62
	63	static void fuse_read_inode(struct inode *inode)
	64	{
65	/* No op */
66	}
67
68	static void fuse_clear_inode(struct inode *inode)
69	{
70	}
71
72	void fuse_change_attributes(struct inode inode, struct fuse_attr attr)
73	{
74	if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size)
75	invalidate_inode_pages(inode->i_mapping);
76
77	inode->i_ino = attr->ino;
78	inode->i_mode = (inode->i_mode & S_IFMT) + (attr->mode & 07777);
79	inode->i_nlink = attr->nlink;
80	inode->i_uid = attr->uid;
81	inode->i_gid = attr->gid;
82	i_size_write(inode, attr->size);
83	inode->i_blksize = PAGE_CACHE_SIZE;
84	inode->i_blocks = attr->blocks;
85	inode->i_atime.tv_sec = attr->atime;
86	inode->i_atime.tv_nsec = attr->atimensec;
87	inode->i_mtime.tv_sec = attr->mtime;
88	inode->i_mtime.tv_nsec = attr->mtimensec;
89	inode->i_ctime.tv_sec = attr->ctime;
90	inode->i_ctime.tv_nsec = attr->ctimensec;
91	}
92
93	static void fuse_init_inode(struct inode inode, struct fuse_attr attr)
94	{
95	inode->i_mode = attr->mode & S_IFMT;
96	i_size_write(inode, attr->size);
97	}
98
99	static int fuse_inode_eq(struct inode inode, void _nodeidp)
100	{
101	unsigned long nodeid = (unsigned long ) _nodeidp;
102	if (get_node_id(inode) == nodeid)
103	return 1;
104	else
105	return 0;
106	}
107
108	static int fuse_inode_set(struct inode inode, void _nodeidp)
109	{
110	unsigned long nodeid = (unsigned long ) _nodeidp;
111	get_fuse_inode(inode)->nodeid = nodeid;
112	return 0;
113	}
114
115	struct inode fuse_iget(struct super_block sb, unsigned long nodeid,
116	int generation, struct fuse_attr *attr, int version)
117	{
118	struct inode *inode;
119	struct fuse_conn *fc = get_fuse_conn_super(sb);
120	int retried = 0;
121
122	retry:
123	inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid);
124	if (!inode)
125	return NULL;
126
127	if ((inode->i_state & I_NEW)) {
128	inode->i_generation = generation;
129	inode->i_data.backing_dev_info = &fc->bdi;
130	fuse_init_inode(inode, attr);
131	unlock_new_inode(inode);
132	} else if ((inode->i_mode ^ attr->mode) & S_IFMT) {
133	BUG_ON(retried);
134	/* Inode has changed type, any I/O on the old should fail */
135	make_bad_inode(inode);
136	iput(inode);
137	retried = 1;
138	goto retry;
139	}
140
141	fuse_change_attributes(inode, attr);
142	inode->i_version = version;
143	return inode;
144	}
145
146	static void fuse_put_super(struct super_block *sb)
147	{
148	struct fuse_conn *fc = get_fuse_conn_super(sb);
149
150	spin_lock(&fuse_lock);
151	mount_count --;
152	fc->sb = NULL;
153	fc->user_id = 0;
154	fuse_release_conn(fc);
155	*get_fuse_conn_super_p(sb) = NULL;
156	spin_unlock(&fuse_lock);
157	}
158
159	enum {
160	OPT_FD,
161	OPT_ROOTMODE,
162	OPT_USER_ID,
163	OPT_DEFAULT_PERMISSIONS,
164	OPT_ALLOW_OTHER,
165	OPT_ALLOW_ROOT,
166	OPT_KERNEL_CACHE,
167	OPT_ERR
168	};
169
170	static match_table_t tokens = {
171	{OPT_FD, "fd=%u"},
172	{OPT_ROOTMODE, "rootmode=%o"},
173	{OPT_USER_ID, "user_id=%u"},
174	{OPT_DEFAULT_PERMISSIONS, "default_permissions"},
175	{OPT_ALLOW_OTHER, "allow_other"},
176	{OPT_ALLOW_ROOT, "allow_root"},
177	{OPT_KERNEL_CACHE, "kernel_cache"},
178	{OPT_ERR, NULL}
179	};
180
181	static int parse_fuse_opt(char opt, struct fuse_mount_data d)
182	{
183	char *p;
184	memset(d, 0, sizeof(struct fuse_mount_data));
185	d->fd = -1;
186
187	while ((p = strsep(&opt, ",")) != NULL) {
188	int token;
189	int value;
190	substring_t args[MAX_OPT_ARGS];
191	if (!*p)
192	continue;
193
194	token = match_token(p, tokens, args);
195	switch (token) {
196	case OPT_FD:
197	if (match_int(&args[0], &value))
198	return 0;
199	d->fd = value;
200	break;
201
202	case OPT_ROOTMODE:
203	if (match_octal(&args[0], &value))
204	return 0;
205	d->rootmode = value;
206	break;
207
208	case OPT_USER_ID:
209	if (match_int(&args[0], &value))
210	return 0;
211	d->user_id = value;
212	break;
213
214	default:
215	return 0;
216	}
217	}
218	if (d->fd == -1)
219	return 0;
220
221	return 1;
222	}
223
224	static int fuse_show_options(struct seq_file m, struct vfsmount mnt)
225	{
226	struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb);
227
228	seq_printf(m, ",user_id=%u", fc->user_id);
229	return 0;
230	}
231
232	void fuse_release_conn(struct fuse_conn *fc)
233	{
234	kfree(fc);
235	}
236
237	static struct fuse_conn *new_conn(void)
238	{
239	struct fuse_conn *fc;
240
241	fc = kmalloc(sizeof(*fc), GFP_KERNEL);
242	if (fc != NULL) {
243	memset(fc, 0, sizeof(*fc));
244	fc->sb = NULL;
245	fc->user_id = 0;
246	fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
247	fc->bdi.unplug_io_fn = default_unplug_io_fn;
248	}
249	return fc;
250	}
251
252	static struct fuse_conn get_conn(struct file file, struct super_block *sb)
253	{
254	struct fuse_conn *fc;
255
256	fc = new_conn();
257	if (fc == NULL)
258	return NULL;
259	spin_lock(&fuse_lock);
260	fc->sb = sb;
261	spin_unlock(&fuse_lock);
262	return fc;
263	}
264
265	static struct inode get_root_inode(struct super_block sb, unsigned mode)
266	{
267	struct fuse_attr attr;
268	memset(&attr, 0, sizeof(attr));
269
270	attr.mode = mode;
271	attr.ino = FUSE_ROOT_ID;
272	return fuse_iget(sb, 1, 0, &attr, 0);
273	}
274
275	static struct super_operations fuse_super_operations = {
276	.alloc_inode = fuse_alloc_inode,
277	.destroy_inode = fuse_destroy_inode,
278	.read_inode = fuse_read_inode,
279	.clear_inode = fuse_clear_inode,
280	.put_super = fuse_put_super,
281	.show_options = fuse_show_options,
282	};
283
284	static int inc_mount_count(void)
285	{
286	int success = 0;
287	spin_lock(&fuse_lock);
288	mount_count ++;
289	if (mount_max == -1 \|\| mount_count <= mount_max)
290	success = 1;
291	spin_unlock(&fuse_lock);
292	return success;
293	}
294
295	static int fuse_fill_super(struct super_block sb, void data, int silent)
296	{
297	struct fuse_conn *fc;
298	struct inode *root;
299	struct fuse_mount_data d;
300	struct file *file;
301	int err;
302
303	if (!parse_fuse_opt((char *) data, &d))
304	return -EINVAL;
305
306	sb->s_blocksize = PAGE_CACHE_SIZE;
307	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
308	sb->s_magic = FUSE_SUPER_MAGIC;
309	sb->s_op = &fuse_super_operations;
310	sb->s_maxbytes = MAX_LFS_FILESIZE;
311
312	file = fget(d.fd);
313	if (!file)
314	return -EINVAL;
315
316	fc = get_conn(file, sb);
317	fput(file);
318	if (fc == NULL)
319	return -EINVAL;
320
321	fc->user_id = d.user_id;
322
323	*get_fuse_conn_super_p(sb) = fc;
324
325	err = -ENFILE;
326	if (!inc_mount_count() && current->uid != 0)
327	goto err;
328
329	err = -ENOMEM;
330	root = get_root_inode(sb, d.rootmode);
331	if (root == NULL)
332	goto err;
333
334	sb->s_root = d_alloc_root(root);
335	if (!sb->s_root) {
336	iput(root);
337	goto err;
338	}
339	return 0;
340
341	err:
342	spin_lock(&fuse_lock);
343	mount_count --;
344	fc->sb = NULL;
345	fuse_release_conn(fc);
346	spin_unlock(&fuse_lock);
347	*get_fuse_conn_super_p(sb) = NULL;
348	return err;
349	}
350
351	static struct super_block fuse_get_sb(struct file_system_type fs_type,
352	int flags, const char *dev_name,
353	void *raw_data)
354	{
355	return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super);
356	}
357
358	static struct file_system_type fuse_fs_type = {
359	.owner = THIS_MODULE,
360	.name = "fuse",
361	.get_sb = fuse_get_sb,
362	.kill_sb = kill_anon_super,
363	};
364
365	static void fuse_inode_init_once(void foo, kmem_cache_t cachep,
366	unsigned long flags)
367	{
368	struct inode * inode = foo;
369
370	if ((flags & (SLAB_CTOR_VERIFY\|SLAB_CTOR_CONSTRUCTOR)) ==
371	SLAB_CTOR_CONSTRUCTOR)
372	inode_init_once(inode);
373	}
374
375	static int __init fuse_fs_init(void)
376	{
377	int err;
378
379	err = register_filesystem(&fuse_fs_type);
380	if (err)
381	printk("fuse: failed to register filesystem\n");
382	else {
383	fuse_inode_cachep = kmem_cache_create("fuse_inode",
384	sizeof(struct fuse_inode),
385	0, SLAB_HWCACHE_ALIGN,
386	fuse_inode_init_once, NULL);
387	if (!fuse_inode_cachep) {
388	unregister_filesystem(&fuse_fs_type);
389	err = -ENOMEM;
390	}
391	}
392
393	return err;
394	}
395
396	static void fuse_fs_cleanup(void)
397	{
398	unregister_filesystem(&fuse_fs_type);
399	kmem_cache_destroy(fuse_inode_cachep);
400	}
401
402	static int __init fuse_init(void)
403	{
404	int res;
405
406	printk("fuse init (API version %i.%i)\n",
407	FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
408
409	spin_lock_init(&fuse_lock);
410	res = fuse_fs_init();
411	if (res)
412	goto err;
413
414	return 0;
415
416	err:
417	return res;
418	}
419
420	static void __exit fuse_exit(void)
421	{
422	printk(KERN_DEBUG "fuse exit\n");
423
424	fuse_fs_cleanup();
425	}
426
427	module_init(fuse_init);
428	module_exit(fuse_exit);