[mirror_ubuntu-artful-kernel.git] / fs / 9p / v9fs.c

/*
 *  linux/fs/9p/v9fs.c
 *
 *  This file contains functions assisting in mapping VFS to 9P2000
 *
 *  Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
 *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to:
 *  Free Software Foundation
 *  51 Franklin Street, Fifth Floor
 *  Boston, MA  02111-1301  USA
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/cred.h>
#include <linux/parser.h>
#include <linux/idr.h>
#include <linux/slab.h>
#include <net/9p/9p.h>
#include <net/9p/client.h>
#include <net/9p/transport.h>
#include "v9fs.h"
#include "v9fs_vfs.h"
#include "cache.h"

static DEFINE_SPINLOCK(v9fs_sessionlist_lock);
static LIST_HEAD(v9fs_sessionlist);
struct kmem_cache *v9fs_inode_cache;

/*
 * Option Parsing (code inspired by NFS code)
 *  NOTE: each transport will parse its own options
 */

enum {
	/* Options that take integer arguments */
	Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid,
	/* String options */
	Opt_uname, Opt_remotename, Opt_cache, Opt_cachetag,
	/* Options that take no arguments */
	Opt_nodevmap,
	/* Cache options */
	Opt_cache_loose, Opt_fscache, Opt_mmap,
	/* Access options */
	Opt_access, Opt_posixacl,
	/* Error token */
	Opt_err
};

static const match_table_t tokens = {
	{Opt_debug, "debug=%x"},
	{Opt_dfltuid, "dfltuid=%u"},
	{Opt_dfltgid, "dfltgid=%u"},
	{Opt_afid, "afid=%u"},
	{Opt_uname, "uname=%s"},
	{Opt_remotename, "aname=%s"},
	{Opt_nodevmap, "nodevmap"},
	{Opt_cache, "cache=%s"},
	{Opt_cache_loose, "loose"},
	{Opt_fscache, "fscache"},
	{Opt_mmap, "mmap"},
	{Opt_cachetag, "cachetag=%s"},
	{Opt_access, "access=%s"},
	{Opt_posixacl, "posixacl"},
	{Opt_err, NULL}
};

/* Interpret mount options for cache mode */
static int get_cache_mode(char *s)
{
	int version = -EINVAL;

	if (!strcmp(s, "loose")) {
		version = CACHE_LOOSE;
		p9_debug(P9_DEBUG_9P, "Cache mode: loose\n");
	} else if (!strcmp(s, "fscache")) {
		version = CACHE_FSCACHE;
		p9_debug(P9_DEBUG_9P, "Cache mode: fscache\n");
	} else if (!strcmp(s, "mmap")) {
		version = CACHE_MMAP;
		p9_debug(P9_DEBUG_9P, "Cache mode: mmap\n");
	} else if (!strcmp(s, "none")) {
		version = CACHE_NONE;
		p9_debug(P9_DEBUG_9P, "Cache mode: none\n");
	} else
		pr_info("Unknown Cache mode %s\n", s);
	return version;
}

/**
 * v9fs_parse_options - parse mount options into session structure
 * @v9ses: existing v9fs session information
 *
 * Return 0 upon success, -ERRNO upon failure.
 */

static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
{
	char *options, *tmp_options;
	substring_t args[MAX_OPT_ARGS];
	char *p;
	int option = 0;
	char *s, *e;
	int ret = 0;

	/* setup defaults */
	v9ses->afid = ~0;
	v9ses->debug = 0;
	v9ses->cache = CACHE_NONE;
#ifdef CONFIG_9P_FSCACHE
	v9ses->cachetag = NULL;
#endif

	if (!opts)
		return 0;

	tmp_options = kstrdup(opts, GFP_KERNEL);
	if (!tmp_options) {
		ret = -ENOMEM;
		goto fail_option_alloc;
	}
	options = tmp_options;

	while ((p = strsep(&options, ",")) != NULL) {
		int token, r;
		if (!*p)
			continue;
		token = match_token(p, tokens, args);
		switch (token) {
		case Opt_debug:
			r = match_int(&args[0], &option);
			if (r < 0) {
				p9_debug(P9_DEBUG_ERROR,
					 "integer field, but no integer?\n");
				ret = r;
				continue;
			}
			v9ses->debug = option;
#ifdef CONFIG_NET_9P_DEBUG
			p9_debug_level = option;
#endif
			break;

		case Opt_dfltuid:
			r = match_int(&args[0], &option);
			if (r < 0) {
				p9_debug(P9_DEBUG_ERROR,
					 "integer field, but no integer?\n");
				ret = r;
				continue;
			}
			v9ses->dfltuid = make_kuid(current_user_ns(), option);
			if (!uid_valid(v9ses->dfltuid)) {
				p9_debug(P9_DEBUG_ERROR,
					 "uid field, but not a uid?\n");
				ret = -EINVAL;
				continue;
			}
			break;
		case Opt_dfltgid:
			r = match_int(&args[0], &option);
			if (r < 0) {
				p9_debug(P9_DEBUG_ERROR,
					 "integer field, but no integer?\n");
				ret = r;
				continue;
			}
			v9ses->dfltgid = make_kgid(current_user_ns(), option);
			if (!gid_valid(v9ses->dfltgid)) {
				p9_debug(P9_DEBUG_ERROR,
					 "gid field, but not a gid?\n");
				ret = -EINVAL;
				continue;
			}
			break;
		case Opt_afid:
			r = match_int(&args[0], &option);
			if (r < 0) {
				p9_debug(P9_DEBUG_ERROR,
					 "integer field, but no integer?\n");
				ret = r;
				continue;
			}
			v9ses->afid = option;
			break;
		case Opt_uname:
			kfree(v9ses->uname);
			v9ses->uname = match_strdup(&args[0]);
			if (!v9ses->uname) {
				ret = -ENOMEM;
				goto free_and_return;
			}
			break;
		case Opt_remotename:
			kfree(v9ses->aname);
			v9ses->aname = match_strdup(&args[0]);
			if (!v9ses->aname) {
				ret = -ENOMEM;
				goto free_and_return;
			}
			break;
		case Opt_nodevmap:
			v9ses->nodev = 1;
			break;
		case Opt_cache_loose:
			v9ses->cache = CACHE_LOOSE;
			break;
		case Opt_fscache:
			v9ses->cache = CACHE_FSCACHE;
			break;
		case Opt_mmap:
			v9ses->cache = CACHE_MMAP;
			break;
		case Opt_cachetag:
#ifdef CONFIG_9P_FSCACHE
			v9ses->cachetag = match_strdup(&args[0]);
#endif
			break;
		case Opt_cache:
			s = match_strdup(&args[0]);
			if (!s) {
				ret = -ENOMEM;
				p9_debug(P9_DEBUG_ERROR,
					 "problem allocating copy of cache arg\n");
				goto free_and_return;
			}
			ret = get_cache_mode(s);
			if (ret == -EINVAL) {
				kfree(s);
				goto free_and_return;
			}

			v9ses->cache = ret;
			kfree(s);
			break;

		case Opt_access:
			s = match_strdup(&args[0]);
			if (!s) {
				ret = -ENOMEM;
				p9_debug(P9_DEBUG_ERROR,
					 "problem allocating copy of access arg\n");
				goto free_and_return;
			}

			v9ses->flags &= ~V9FS_ACCESS_MASK;
			if (strcmp(s, "user") == 0)
				v9ses->flags |= V9FS_ACCESS_USER;
			else if (strcmp(s, "any") == 0)
				v9ses->flags |= V9FS_ACCESS_ANY;
			else if (strcmp(s, "client") == 0) {
				v9ses->flags |= V9FS_ACCESS_CLIENT;
			} else {
				uid_t uid;
				v9ses->flags |= V9FS_ACCESS_SINGLE;
				uid = simple_strtoul(s, &e, 10);
				if (*e != '\0') {
					ret = -EINVAL;
					pr_info("Unknown access argument %s\n",
						s);
					kfree(s);
					goto free_and_return;
				}
				v9ses->uid = make_kuid(current_user_ns(), uid);
				if (!uid_valid(v9ses->uid)) {
					ret = -EINVAL;
					pr_info("Uknown uid %s\n", s);
					kfree(s);
					goto free_and_return;
				}
			}

			kfree(s);
			break;

		case Opt_posixacl:
#ifdef CONFIG_9P_FS_POSIX_ACL
			v9ses->flags |= V9FS_POSIX_ACL;
#else
			p9_debug(P9_DEBUG_ERROR,
				 "Not defined CONFIG_9P_FS_POSIX_ACL. Ignoring posixacl option\n");
#endif
			break;

		default:
			continue;
		}
	}

free_and_return:
	kfree(tmp_options);
fail_option_alloc:
	return ret;
}

/**
 * v9fs_session_init - initialize session
 * @v9ses: session information structure
 * @dev_name: device being mounted
 * @data: options
 *
 */

struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
		  const char *dev_name, char *data)
{
	struct p9_fid *fid;
	int rc = -ENOMEM;

	v9ses->uname = kstrdup(V9FS_DEFUSER, GFP_KERNEL);
	if (!v9ses->uname)
		goto err_names;

	v9ses->aname = kstrdup(V9FS_DEFANAME, GFP_KERNEL);
	if (!v9ses->aname)
		goto err_names;
	init_rwsem(&v9ses->rename_sem);

	rc = bdi_setup_and_register(&v9ses->bdi, "9p");
	if (rc)
		goto err_names;

	v9ses->uid = INVALID_UID;
	v9ses->dfltuid = V9FS_DEFUID;
	v9ses->dfltgid = V9FS_DEFGID;

	v9ses->clnt = p9_client_create(dev_name, data);
	if (IS_ERR(v9ses->clnt)) {
		rc = PTR_ERR(v9ses->clnt);
		p9_debug(P9_DEBUG_ERROR, "problem initializing 9p client\n");
		goto err_bdi;
	}

	v9ses->flags = V9FS_ACCESS_USER;

	if (p9_is_proto_dotl(v9ses->clnt)) {
		v9ses->flags = V9FS_ACCESS_CLIENT;
		v9ses->flags |= V9FS_PROTO_2000L;
	} else if (p9_is_proto_dotu(v9ses->clnt)) {
		v9ses->flags |= V9FS_PROTO_2000U;
	}

	rc = v9fs_parse_options(v9ses, data);
	if (rc < 0)
		goto err_clnt;

	v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ;

	if (!v9fs_proto_dotl(v9ses) &&
	    ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
		/*
		 * We support ACCESS_CLIENT only for dotl.
		 * Fall back to ACCESS_USER
		 */
		v9ses->flags &= ~V9FS_ACCESS_MASK;
		v9ses->flags |= V9FS_ACCESS_USER;
	}
	/*FIXME !! */
	/* for legacy mode, fall back to V9FS_ACCESS_ANY */
	if (!(v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) &&
		((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {

		v9ses->flags &= ~V9FS_ACCESS_MASK;
		v9ses->flags |= V9FS_ACCESS_ANY;
		v9ses->uid = INVALID_UID;
	}
	if (!v9fs_proto_dotl(v9ses) ||
		!((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
		/*
		 * We support ACL checks on clinet only if the protocol is
		 * 9P2000.L and access is V9FS_ACCESS_CLIENT.
		 */
		v9ses->flags &= ~V9FS_ACL_MASK;
	}

	fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, INVALID_UID,
							v9ses->aname);
	if (IS_ERR(fid)) {
		rc = PTR_ERR(fid);
		p9_debug(P9_DEBUG_ERROR, "cannot attach\n");
		goto err_clnt;
	}

	if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE)
		fid->uid = v9ses->uid;
	else
		fid->uid = INVALID_UID;

#ifdef CONFIG_9P_FSCACHE
	/* register the session for caching */
	v9fs_cache_session_get_cookie(v9ses);
#endif
	spin_lock(&v9fs_sessionlist_lock);
	list_add(&v9ses->slist, &v9fs_sessionlist);
	spin_unlock(&v9fs_sessionlist_lock);

	return fid;

err_clnt:
	p9_client_destroy(v9ses->clnt);
err_bdi:
	bdi_destroy(&v9ses->bdi);
err_names:
	kfree(v9ses->uname);
	kfree(v9ses->aname);
	return ERR_PTR(rc);
}

/**
 * v9fs_session_close - shutdown a session
 * @v9ses: session information structure
 *
 */

void v9fs_session_close(struct v9fs_session_info *v9ses)
{
	if (v9ses->clnt) {
		p9_client_destroy(v9ses->clnt);
		v9ses->clnt = NULL;
	}

#ifdef CONFIG_9P_FSCACHE
	if (v9ses->fscache) {
		v9fs_cache_session_put_cookie(v9ses);
		kfree(v9ses->cachetag);
	}
#endif
	kfree(v9ses->uname);
	kfree(v9ses->aname);

	bdi_destroy(&v9ses->bdi);

	spin_lock(&v9fs_sessionlist_lock);
	list_del(&v9ses->slist);
	spin_unlock(&v9fs_sessionlist_lock);
}

/**
 * v9fs_session_cancel - terminate a session
 * @v9ses: session to terminate
 *
 * mark transport as disconnected and cancel all pending requests.
 */

void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
	p9_debug(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
	p9_client_disconnect(v9ses->clnt);
}

/**
 * v9fs_session_begin_cancel - Begin terminate of a session
 * @v9ses: session to terminate
 *
 * After this call we don't allow any request other than clunk.
 */

void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses)
{
	p9_debug(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses);
	p9_client_begin_disconnect(v9ses->clnt);
}

extern int v9fs_error_init(void);

static struct kobject *v9fs_kobj;

#ifdef CONFIG_9P_FSCACHE
/**
 * caches_show - list caches associated with a session
 *
 * Returns the size of buffer written.
 */

static ssize_t caches_show(struct kobject *kobj,
			   struct kobj_attribute *attr,
			   char *buf)
{
	ssize_t n = 0, count = 0, limit = PAGE_SIZE;
	struct v9fs_session_info *v9ses;

	spin_lock(&v9fs_sessionlist_lock);
	list_for_each_entry(v9ses, &v9fs_sessionlist, slist) {
		if (v9ses->cachetag) {
			n = snprintf(buf, limit, "%s\n", v9ses->cachetag);
			if (n < 0) {
				count = n;
				break;
			}

			count += n;
			limit -= n;
		}
	}

	spin_unlock(&v9fs_sessionlist_lock);
	return count;
}

static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches);
#endif /* CONFIG_9P_FSCACHE */

static struct attribute *v9fs_attrs[] = {
#ifdef CONFIG_9P_FSCACHE
	&v9fs_attr_cache.attr,
#endif
	NULL,
};

static struct attribute_group v9fs_attr_group = {
	.attrs = v9fs_attrs,
};

/**
 * v9fs_sysfs_init - Initialize the v9fs sysfs interface
 *
 */

static int __init v9fs_sysfs_init(void)
{
	v9fs_kobj = kobject_create_and_add("9p", fs_kobj);
	if (!v9fs_kobj)
		return -ENOMEM;

	if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) {
		kobject_put(v9fs_kobj);
		return -ENOMEM;
	}

	return 0;
}

/**
 * v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface
 *
 */

static void v9fs_sysfs_cleanup(void)
{
	sysfs_remove_group(v9fs_kobj, &v9fs_attr_group);
	kobject_put(v9fs_kobj);
}

static void v9fs_inode_init_once(void *foo)
{
	struct v9fs_inode *v9inode = (struct v9fs_inode *)foo;
#ifdef CONFIG_9P_FSCACHE
	v9inode->fscache = NULL;
#endif
	memset(&v9inode->qid, 0, sizeof(v9inode->qid));
	inode_init_once(&v9inode->vfs_inode);
}

/**
 * v9fs_init_inode_cache - initialize a cache for 9P
 * Returns 0 on success.
 */
static int v9fs_init_inode_cache(void)
{
	v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache",
					  sizeof(struct v9fs_inode),
					  0, (SLAB_RECLAIM_ACCOUNT|
					      SLAB_MEM_SPREAD|SLAB_ACCOUNT),
					  v9fs_inode_init_once);
	if (!v9fs_inode_cache)
		return -ENOMEM;

	return 0;
}

/**
 * v9fs_destroy_inode_cache - destroy the cache of 9P inode
 *
 */
static void v9fs_destroy_inode_cache(void)
{
	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
	kmem_cache_destroy(v9fs_inode_cache);
}

static int v9fs_cache_register(void)
{
	int ret;
	ret = v9fs_init_inode_cache();
	if (ret < 0)
		return ret;
#ifdef CONFIG_9P_FSCACHE
	ret = fscache_register_netfs(&v9fs_cache_netfs);
	if (ret < 0)
		v9fs_destroy_inode_cache();
#endif
	return ret;
}

static void v9fs_cache_unregister(void)
{
	v9fs_destroy_inode_cache();
#ifdef CONFIG_9P_FSCACHE
	fscache_unregister_netfs(&v9fs_cache_netfs);
#endif
}

/**
 * init_v9fs - Initialize module
 *
 */

static int __init init_v9fs(void)
{
	int err;
	pr_info("Installing v9fs 9p2000 file system support\n");
	/* TODO: Setup list of registered trasnport modules */

	err = v9fs_cache_register();
	if (err < 0) {
		pr_err("Failed to register v9fs for caching\n");
		return err;
	}

	err = v9fs_sysfs_init();
	if (err < 0) {
		pr_err("Failed to register with sysfs\n");
		goto out_cache;
	}
	err = register_filesystem(&v9fs_fs_type);
	if (err < 0) {
		pr_err("Failed to register filesystem\n");
		goto out_sysfs_cleanup;
	}

	return 0;

out_sysfs_cleanup:
	v9fs_sysfs_cleanup();

out_cache:
	v9fs_cache_unregister();

	return err;
}

/**
 * exit_v9fs - shutdown module
 *
 */

static void __exit exit_v9fs(void)
{
	v9fs_sysfs_cleanup();
	v9fs_cache_unregister();
	unregister_filesystem(&v9fs_fs_type);
}

module_init(init_v9fs)
module_exit(exit_v9fs)

MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
MODULE_LICENSE("GPL");
Commit	Line	Data
9e82cf6a EVH	1	/*
	2	* linux/fs/9p/v9fs.c
	3	*
	4	* This file contains functions assisting in mapping VFS to 9P2000
	5	*
8a0dc95f	6	* Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
9e82cf6a EVH	7	* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
	8	*
	9	* This program is free software; you can redistribute it and/or modify
42e8c509 EVH	10	* it under the terms of the GNU General Public License version 2
42e8c509 EVH	11	* as published by the Free Software Foundation.
9e82cf6a EVH	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to:
	20	* Free Software Foundation
	21	* 51 Franklin Street, Fifth Floor
	22	* Boston, MA 02111-1301 USA
	23	*
	24	*/
	25
5d385153 JP	26	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
5d385153 JP	27
9e82cf6a EVH	28	#include <linux/module.h>
	29	#include <linux/errno.h>
	30	#include <linux/fs.h>
914e2637	31	#include <linux/sched.h>
5b825c3a	32	#include <linux/cred.h>
9e82cf6a EVH	33	#include <linux/parser.h>
9e82cf6a EVH	34	#include <linux/idr.h>
5a0e3ad6	35	#include <linux/slab.h>
bd238fb4	36	#include <net/9p/9p.h>
bd238fb4	37	#include <net/9p/client.h>
8b81ef58	38	#include <net/9p/transport.h>
9e82cf6a	39	#include "v9fs.h"
9e82cf6a	40	#include "v9fs_vfs.h"
60e78d2c AK	41	#include "cache.h"
	42
	43	static DEFINE_SPINLOCK(v9fs_sessionlist_lock);
	44	static LIST_HEAD(v9fs_sessionlist);
a78ce05d	45	struct kmem_cache *v9fs_inode_cache;
9e82cf6a EVH	46
9e82cf6a EVH	47	/*
60e78d2c AK	48	* Option Parsing (code inspired by NFS code)
	49	* NOTE: each transport will parse its own options
	50	*/
9e82cf6a EVH	51
	52	enum {
	53	/* Options that take integer arguments */
8a0dc95f	54	Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid,
9e82cf6a	55	/* String options */
cb9af418	56	Opt_uname, Opt_remotename, Opt_cache, Opt_cachetag,
9e82cf6a	57	/* Options that take no arguments */
8a0dc95f	58	Opt_nodevmap,
e03abc0c	59	/* Cache options */
fb89b45c	60	Opt_cache_loose, Opt_fscache, Opt_mmap,
ba17674f	61	/* Access options */
e782ef71	62	Opt_access, Opt_posixacl,
9e82cf6a EVH	63	/* Error token */
	64	Opt_err
	65	};
	66
a447c093	67	static const match_table_t tokens = {
9e2f6688	68	{Opt_debug, "debug=%x"},
bd32b82d LI	69	{Opt_dfltuid, "dfltuid=%u"},
bd32b82d LI	70	{Opt_dfltgid, "dfltgid=%u"},
9e82cf6a	71	{Opt_afid, "afid=%u"},
67543e50	72	{Opt_uname, "uname=%s"},
9e82cf6a	73	{Opt_remotename, "aname=%s"},
9e82cf6a	74	{Opt_nodevmap, "nodevmap"},
60e78d2c	75	{Opt_cache, "cache=%s"},
e03abc0c	76	{Opt_cache_loose, "loose"},
60e78d2c	77	{Opt_fscache, "fscache"},
fb89b45c	78	{Opt_mmap, "mmap"},
60e78d2c	79	{Opt_cachetag, "cachetag=%s"},
ba17674f	80	{Opt_access, "access=%s"},
e782ef71	81	{Opt_posixacl, "posixacl"},
9e82cf6a EVH	82	{Opt_err, NULL}
	83	};
	84
a2dd43bb PK	85	/* Interpret mount options for cache mode */
	86	static int get_cache_mode(char *s)
	87	{
	88	int version = -EINVAL;
	89
	90	if (!strcmp(s, "loose")) {
	91	version = CACHE_LOOSE;
5d385153	92	p9_debug(P9_DEBUG_9P, "Cache mode: loose\n");
a2dd43bb PK	93	} else if (!strcmp(s, "fscache")) {
a2dd43bb PK	94	version = CACHE_FSCACHE;
5d385153	95	p9_debug(P9_DEBUG_9P, "Cache mode: fscache\n");
fb89b45c DM	96	} else if (!strcmp(s, "mmap")) {
	97	version = CACHE_MMAP;
	98	p9_debug(P9_DEBUG_9P, "Cache mode: mmap\n");
a2dd43bb PK	99	} else if (!strcmp(s, "none")) {
a2dd43bb PK	100	version = CACHE_NONE;
5d385153	101	p9_debug(P9_DEBUG_9P, "Cache mode: none\n");
a2dd43bb	102	} else
5d385153	103	pr_info("Unknown Cache mode %s\n", s);
a2dd43bb PK	104	return version;
	105	}
	106
9e82cf6a EVH	107	/**
9e82cf6a EVH	108	* v9fs_parse_options - parse mount options into session structure
9e82cf6a EVH	109	* @v9ses: existing v9fs session information
9e82cf6a EVH	110	*
ab31267d	111	* Return 0 upon success, -ERRNO upon failure.
9e82cf6a EVH	112	*/
9e82cf6a EVH	113
4b53e4b5	114	static int v9fs_parse_options(struct v9fs_session_info v9ses, char opts)
9e82cf6a	115	{
d8c8a9e3	116	char options, tmp_options;
9e82cf6a	117	substring_t args[MAX_OPT_ARGS];
a80d923e	118	char *p;
8a0dc95f	119	int option = 0;
ba17674f	120	char s, e;
ab31267d	121	int ret = 0;
9e82cf6a EVH	122
9e82cf6a EVH	123	/* setup defaults */
9e82cf6a EVH	124	v9ses->afid = ~0;
9e82cf6a EVH	125	v9ses->debug = 0;
a2dd43bb	126	v9ses->cache = CACHE_NONE;
60e78d2c AK	127	#ifdef CONFIG_9P_FSCACHE
	128	v9ses->cachetag = NULL;
	129	#endif
9e82cf6a	130
4b53e4b5	131	if (!opts)
ab31267d	132	return 0;
9e82cf6a	133
d8c8a9e3	134	tmp_options = kstrdup(opts, GFP_KERNEL);
bf2d29c6 EVH	135	if (!tmp_options) {
bf2d29c6 EVH	136	ret = -ENOMEM;
60e78d2c	137	goto fail_option_alloc;
bf2d29c6	138	}
d8c8a9e3	139	options = tmp_options;
ab31267d	140
9e82cf6a	141	while ((p = strsep(&options, ",")) != NULL) {
4d5077f1	142	int token, r;
9e82cf6a EVH	143	if (!*p)
	144	continue;
	145	token = match_token(p, tokens, args);
4d5077f1 AK	146	switch (token) {
	147	case Opt_debug:
	148	r = match_int(&args[0], &option);
ab31267d	149	if (r < 0) {
5d385153 JP	150	p9_debug(P9_DEBUG_ERROR,
5d385153 JP	151	"integer field, but no integer?\n");
ab31267d	152	ret = r;
9e82cf6a EVH	153	continue;
9e82cf6a EVH	154	}
9e2f6688	155	v9ses->debug = option;
10fa16e7	156	#ifdef CONFIG_NET_9P_DEBUG
9e2f6688	157	p9_debug_level = option;
10fa16e7	158	#endif
9e2f6688	159	break;
8a0dc95f	160
bd32b82d	161	case Opt_dfltuid:
4d5077f1 AK	162	r = match_int(&args[0], &option);
4d5077f1 AK	163	if (r < 0) {
5d385153 JP	164	p9_debug(P9_DEBUG_ERROR,
5d385153 JP	165	"integer field, but no integer?\n");
4d5077f1 AK	166	ret = r;
	167	continue;
	168	}
76ed23a5 EB	169	v9ses->dfltuid = make_kuid(current_user_ns(), option);
	170	if (!uid_valid(v9ses->dfltuid)) {
	171	p9_debug(P9_DEBUG_ERROR,
	172	"uid field, but not a uid?\n");
	173	ret = -EINVAL;
	174	continue;
	175	}
9e82cf6a	176	break;
bd32b82d	177	case Opt_dfltgid:
4d5077f1 AK	178	r = match_int(&args[0], &option);
4d5077f1 AK	179	if (r < 0) {
5d385153 JP	180	p9_debug(P9_DEBUG_ERROR,
5d385153 JP	181	"integer field, but no integer?\n");
4d5077f1 AK	182	ret = r;
	183	continue;
	184	}
76ed23a5 EB	185	v9ses->dfltgid = make_kgid(current_user_ns(), option);
	186	if (!gid_valid(v9ses->dfltgid)) {
	187	p9_debug(P9_DEBUG_ERROR,
	188	"gid field, but not a gid?\n");
	189	ret = -EINVAL;
	190	continue;
	191	}
9e82cf6a EVH	192	break;
9e82cf6a EVH	193	case Opt_afid:
4d5077f1 AK	194	r = match_int(&args[0], &option);
4d5077f1 AK	195	if (r < 0) {
5d385153 JP	196	p9_debug(P9_DEBUG_ERROR,
5d385153 JP	197	"integer field, but no integer?\n");
4d5077f1 AK	198	ret = r;
	199	continue;
	200	}
9e82cf6a EVH	201	v9ses->afid = option;
9e82cf6a EVH	202	break;
67543e50	203	case Opt_uname:
e549c133 JL	204	kfree(v9ses->uname);
	205	v9ses->uname = match_strdup(&args[0]);
	206	if (!v9ses->uname) {
	207	ret = -ENOMEM;
	208	goto free_and_return;
	209	}
9e82cf6a EVH	210	break;
9e82cf6a EVH	211	case Opt_remotename:
e549c133 JL	212	kfree(v9ses->aname);
	213	v9ses->aname = match_strdup(&args[0]);
	214	if (!v9ses->aname) {
	215	ret = -ENOMEM;
	216	goto free_and_return;
	217	}
9e82cf6a	218	break;
9e82cf6a EVH	219	case Opt_nodevmap:
	220	v9ses->nodev = 1;
	221	break;
e03abc0c EVH	222	case Opt_cache_loose:
	223	v9ses->cache = CACHE_LOOSE;
	224	break;
60e78d2c AK	225	case Opt_fscache:
	226	v9ses->cache = CACHE_FSCACHE;
	227	break;
fb89b45c DM	228	case Opt_mmap:
	229	v9ses->cache = CACHE_MMAP;
	230	break;
60e78d2c AK	231	case Opt_cachetag:
	232	#ifdef CONFIG_9P_FSCACHE
	233	v9ses->cachetag = match_strdup(&args[0]);
	234	#endif
	235	break;
	236	case Opt_cache:
	237	s = match_strdup(&args[0]);
bf2d29c6 EVH	238	if (!s) {
bf2d29c6 EVH	239	ret = -ENOMEM;
5d385153 JP	240	p9_debug(P9_DEBUG_ERROR,
5d385153 JP	241	"problem allocating copy of cache arg\n");
bf2d29c6 EVH	242	goto free_and_return;
bf2d29c6 EVH	243	}
a2dd43bb PK	244	ret = get_cache_mode(s);
	245	if (ret == -EINVAL) {
	246	kfree(s);
	247	goto free_and_return;
	248	}
60e78d2c	249
a2dd43bb	250	v9ses->cache = ret;
60e78d2c AK	251	kfree(s);
60e78d2c AK	252	break;
ba17674f LI	253
	254	case Opt_access:
	255	s = match_strdup(&args[0]);
bf2d29c6 EVH	256	if (!s) {
bf2d29c6 EVH	257	ret = -ENOMEM;
5d385153 JP	258	p9_debug(P9_DEBUG_ERROR,
5d385153 JP	259	"problem allocating copy of access arg\n");
bf2d29c6 EVH	260	goto free_and_return;
bf2d29c6 EVH	261	}
60e78d2c	262
ba17674f LI	263	v9ses->flags &= ~V9FS_ACCESS_MASK;
	264	if (strcmp(s, "user") == 0)
	265	v9ses->flags \|= V9FS_ACCESS_USER;
	266	else if (strcmp(s, "any") == 0)
	267	v9ses->flags \|= V9FS_ACCESS_ANY;
76381a42	268	else if (strcmp(s, "client") == 0) {
76381a42	269	v9ses->flags \|= V9FS_ACCESS_CLIENT;
76381a42	270	} else {
76ed23a5	271	uid_t uid;
ba17674f	272	v9ses->flags \|= V9FS_ACCESS_SINGLE;
76ed23a5	273	uid = simple_strtoul(s, &e, 10);
a2dd43bb PK	274	if (*e != '\0') {
a2dd43bb PK	275	ret = -EINVAL;
5d385153 JP	276	pr_info("Unknown access argument %s\n",
5d385153 JP	277	s);
a2dd43bb PK	278	kfree(s);
	279	goto free_and_return;
	280	}
76ed23a5 EB	281	v9ses->uid = make_kuid(current_user_ns(), uid);
	282	if (!uid_valid(v9ses->uid)) {
	283	ret = -EINVAL;
	284	pr_info("Uknown uid %s\n", s);
	285	kfree(s);
	286	goto free_and_return;
	287	}
ba17674f	288	}
a2dd43bb	289
0a976297	290	kfree(s);
ba17674f LI	291	break;
ba17674f LI	292
e782ef71 VJJ	293	case Opt_posixacl:
	294	#ifdef CONFIG_9P_FS_POSIX_ACL
	295	v9ses->flags \|= V9FS_POSIX_ACL;
	296	#else
5d385153 JP	297	p9_debug(P9_DEBUG_ERROR,
5d385153 JP	298	"Not defined CONFIG_9P_FS_POSIX_ACL. Ignoring posixacl option\n");
e782ef71 VJJ	299	#endif
	300	break;
	301
9e82cf6a EVH	302	default:
	303	continue;
	304	}
	305	}
d8c8a9e3	306
bf2d29c6	307	free_and_return:
d8c8a9e3	308	kfree(tmp_options);
60e78d2c	309	fail_option_alloc:
bf2d29c6	310	return ret;
9e82cf6a EVH	311	}
9e82cf6a EVH	312
9e82cf6a EVH	313	/**
	314	* v9fs_session_init - initialize session
	315	* @v9ses: session information structure
	316	* @dev_name: device being mounted
	317	* @data: options
	318	*
	319	*/
	320
bd238fb4	321	struct p9_fid v9fs_session_init(struct v9fs_session_info v9ses,
9e82cf6a EVH	322	const char dev_name, char data)
9e82cf6a EVH	323	{
bd238fb4	324	struct p9_fid *fid;
412a19b6	325	int rc = -ENOMEM;
9e82cf6a	326
e549c133	327	v9ses->uname = kstrdup(V9FS_DEFUSER, GFP_KERNEL);
ba17674f	328	if (!v9ses->uname)
412a19b6	329	goto err_names;
9e82cf6a	330
e549c133	331	v9ses->aname = kstrdup(V9FS_DEFANAME, GFP_KERNEL);
412a19b6 TH	332	if (!v9ses->aname)
412a19b6 TH	333	goto err_names;
a534c8d1	334	init_rwsem(&v9ses->rename_sem);
9e82cf6a	335
b4caecd4	336	rc = bdi_setup_and_register(&v9ses->bdi, "9p");
412a19b6 TH	337	if (rc)
412a19b6 TH	338	goto err_names;
60e78d2c	339
76ed23a5	340	v9ses->uid = INVALID_UID;
bd32b82d LI	341	v9ses->dfltuid = V9FS_DEFUID;
bd32b82d LI	342	v9ses->dfltgid = V9FS_DEFGID;
ab31267d	343
4b53e4b5	344	v9ses->clnt = p9_client_create(dev_name, data);
bd238fb4	345	if (IS_ERR(v9ses->clnt)) {
412a19b6	346	rc = PTR_ERR(v9ses->clnt);
5d385153	347	p9_debug(P9_DEBUG_ERROR, "problem initializing 9p client\n");
412a19b6	348	goto err_bdi;
9e82cf6a EVH	349	}
9e82cf6a EVH	350
6752a1eb VJJ	351	v9ses->flags = V9FS_ACCESS_USER;
	352
	353	if (p9_is_proto_dotl(v9ses->clnt)) {
	354	v9ses->flags = V9FS_ACCESS_CLIENT;
476ada04	355	v9ses->flags \|= V9FS_PROTO_2000L;
6752a1eb	356	} else if (p9_is_proto_dotu(v9ses->clnt)) {
476ada04	357	v9ses->flags \|= V9FS_PROTO_2000U;
6752a1eb VJJ	358	}
	359
	360	rc = v9fs_parse_options(v9ses, data);
412a19b6 TH	361	if (rc < 0)
412a19b6 TH	362	goto err_clnt;
ba17674f	363
fbedadc1	364	v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ;
8a0dc95f	365
76381a42 AK	366	if (!v9fs_proto_dotl(v9ses) &&
	367	((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
	368	/*
	369	* We support ACCESS_CLIENT only for dotl.
	370	* Fall back to ACCESS_USER
	371	*/
	372	v9ses->flags &= ~V9FS_ACCESS_MASK;
	373	v9ses->flags \|= V9FS_ACCESS_USER;
	374	}
	375	/FIXME !! /
ba17674f	376	/* for legacy mode, fall back to V9FS_ACCESS_ANY */
9ffaf63e	377	if (!(v9fs_proto_dotu(v9ses) \|\| v9fs_proto_dotl(v9ses)) &&
ba17674f LI	378	((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {
	379
	380	v9ses->flags &= ~V9FS_ACCESS_MASK;
	381	v9ses->flags \|= V9FS_ACCESS_ANY;
76ed23a5	382	v9ses->uid = INVALID_UID;
ba17674f	383	}
e782ef71 VJJ	384	if (!v9fs_proto_dotl(v9ses) \|\|
	385	!((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
	386	/*
	387	* We support ACL checks on clinet only if the protocol is
	388	* 9P2000.L and access is V9FS_ACCESS_CLIENT.
	389	*/
	390	v9ses->flags &= ~V9FS_ACL_MASK;
	391	}
ba17674f	392
f791f7c5	393	fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, INVALID_UID,
ba17674f	394	v9ses->aname);
bd238fb4	395	if (IS_ERR(fid)) {
412a19b6	396	rc = PTR_ERR(fid);
5d385153	397	p9_debug(P9_DEBUG_ERROR, "cannot attach\n");
412a19b6	398	goto err_clnt;
9e82cf6a EVH	399	}
9e82cf6a EVH	400
ba17674f LI	401	if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE)
	402	fid->uid = v9ses->uid;
	403	else
b4642556	404	fid->uid = INVALID_UID;
ba17674f	405
60e78d2c AK	406	#ifdef CONFIG_9P_FSCACHE
	407	/* register the session for caching */
	408	v9fs_cache_session_get_cookie(v9ses);
	409	#endif
412a19b6 TH	410	spin_lock(&v9fs_sessionlist_lock);
	411	list_add(&v9ses->slist, &v9fs_sessionlist);
	412	spin_unlock(&v9fs_sessionlist_lock);
60e78d2c	413
bd238fb4	414	return fid;
9e82cf6a	415
412a19b6 TH	416	err_clnt:
	417	p9_client_destroy(v9ses->clnt);
	418	err_bdi:
0ed07ddb	419	bdi_destroy(&v9ses->bdi);
412a19b6 TH	420	err_names:
	421	kfree(v9ses->uname);
	422	kfree(v9ses->aname);
	423	return ERR_PTR(rc);
9e82cf6a EVH	424	}
	425
	426	/**
	427	* v9fs_session_close - shutdown a session
	428	* @v9ses: session information structure
	429	*
	430	*/
	431
	432	void v9fs_session_close(struct v9fs_session_info *v9ses)
	433	{
bd238fb4 LI	434	if (v9ses->clnt) {
	435	p9_client_destroy(v9ses->clnt);
	436	v9ses->clnt = NULL;
3cf6429a	437	}
9e82cf6a	438
60e78d2c AK	439	#ifdef CONFIG_9P_FSCACHE
	440	if (v9ses->fscache) {
	441	v9fs_cache_session_put_cookie(v9ses);
	442	kfree(v9ses->cachetag);
	443	}
	444	#endif
e549c133 JL	445	kfree(v9ses->uname);
e549c133 JL	446	kfree(v9ses->aname);
60e78d2c	447
0ed07ddb JA	448	bdi_destroy(&v9ses->bdi);
0ed07ddb JA	449
60e78d2c AK	450	spin_lock(&v9fs_sessionlist_lock);
	451	list_del(&v9ses->slist);
	452	spin_unlock(&v9fs_sessionlist_lock);
9e82cf6a EVH	453	}
9e82cf6a EVH	454
322b329a	455	/**
ee443996 EVH	456	* v9fs_session_cancel - terminate a session
	457	* @v9ses: session to terminate
	458	*
	459	* mark transport as disconnected and cancel all pending requests.
322b329a	460	*/
ee443996	461
322b329a	462	void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
5d385153	463	p9_debug(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
bd238fb4	464	p9_client_disconnect(v9ses->clnt);
322b329a EVH	465	}
322b329a EVH	466
6d96d3ab AK	467	/**
	468	* v9fs_session_begin_cancel - Begin terminate of a session
	469	* @v9ses: session to terminate
	470	*
	471	* After this call we don't allow any request other than clunk.
	472	*/
	473
	474	void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses)
	475	{
5d385153	476	p9_debug(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses);
6d96d3ab AK	477	p9_client_begin_disconnect(v9ses->clnt);
	478	}
	479
9e82cf6a EVH	480	extern int v9fs_error_init(void);
9e82cf6a EVH	481
60e78d2c AK	482	static struct kobject *v9fs_kobj;
	483
	484	#ifdef CONFIG_9P_FSCACHE
9e82cf6a	485	/**
60e78d2c AK	486	* caches_show - list caches associated with a session
	487	*
	488	* Returns the size of buffer written.
	489	*/
	490
	491	static ssize_t caches_show(struct kobject *kobj,
	492	struct kobj_attribute *attr,
	493	char *buf)
	494	{
	495	ssize_t n = 0, count = 0, limit = PAGE_SIZE;
	496	struct v9fs_session_info *v9ses;
	497
	498	spin_lock(&v9fs_sessionlist_lock);
	499	list_for_each_entry(v9ses, &v9fs_sessionlist, slist) {
	500	if (v9ses->cachetag) {
	501	n = snprintf(buf, limit, "%s\n", v9ses->cachetag);
	502	if (n < 0) {
	503	count = n;
	504	break;
	505	}
	506
	507	count += n;
	508	limit -= n;
	509	}
	510	}
	511
	512	spin_unlock(&v9fs_sessionlist_lock);
	513	return count;
	514	}
	515
	516	static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches);
	517	#endif /* CONFIG_9P_FSCACHE */
	518
	519	static struct attribute *v9fs_attrs[] = {
	520	#ifdef CONFIG_9P_FSCACHE
	521	&v9fs_attr_cache.attr,
	522	#endif
	523	NULL,
	524	};
	525
	526	static struct attribute_group v9fs_attr_group = {
	527	.attrs = v9fs_attrs,
	528	};
	529
	530	/**
	531	* v9fs_sysfs_init - Initialize the v9fs sysfs interface
	532	*
	533	*/
	534
bdbeacde	535	static int __init v9fs_sysfs_init(void)
60e78d2c AK	536	{
	537	v9fs_kobj = kobject_create_and_add("9p", fs_kobj);
	538	if (!v9fs_kobj)
	539	return -ENOMEM;
	540
	541	if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) {
	542	kobject_put(v9fs_kobj);
	543	return -ENOMEM;
	544	}
	545
	546	return 0;
	547	}
	548
	549	/**
	550	* v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface
	551	*
	552	*/
	553
	554	static void v9fs_sysfs_cleanup(void)
	555	{
	556	sysfs_remove_group(v9fs_kobj, &v9fs_attr_group);
	557	kobject_put(v9fs_kobj);
	558	}
	559
a78ce05d AK	560	static void v9fs_inode_init_once(void *foo)
	561	{
	562	struct v9fs_inode v9inode = (struct v9fs_inode )foo;
	563	#ifdef CONFIG_9P_FSCACHE
	564	v9inode->fscache = NULL;
a78ce05d	565	#endif
fd2421f5	566	memset(&v9inode->qid, 0, sizeof(v9inode->qid));
a78ce05d AK	567	inode_init_once(&v9inode->vfs_inode);
	568	}
	569
	570	/**
	571	* v9fs_init_inode_cache - initialize a cache for 9P
	572	* Returns 0 on success.
	573	*/
	574	static int v9fs_init_inode_cache(void)
	575	{
	576	v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache",
	577	sizeof(struct v9fs_inode),
	578	0, (SLAB_RECLAIM_ACCOUNT\|
5d097056	579	SLAB_MEM_SPREAD\|SLAB_ACCOUNT),
a78ce05d AK	580	v9fs_inode_init_once);
	581	if (!v9fs_inode_cache)
	582	return -ENOMEM;
	583
	584	return 0;
	585	}
	586
	587	/**
	588	* v9fs_destroy_inode_cache - destroy the cache of 9P inode
	589	*
	590	*/
	591	static void v9fs_destroy_inode_cache(void)
	592	{
8c0a8537 KS	593	/*
	594	* Make sure all delayed rcu free inodes are flushed before we
	595	* destroy cache.
	596	*/
	597	rcu_barrier();
a78ce05d AK	598	kmem_cache_destroy(v9fs_inode_cache);
	599	}
	600
	601	static int v9fs_cache_register(void)
	602	{
	603	int ret;
	604	ret = v9fs_init_inode_cache();
	605	if (ret < 0)
	606	return ret;
	607	#ifdef CONFIG_9P_FSCACHE
8061a6fa AV	608	ret = fscache_register_netfs(&v9fs_cache_netfs);
	609	if (ret < 0)
	610	v9fs_destroy_inode_cache();
a78ce05d	611	#endif
8061a6fa	612	return ret;
a78ce05d AK	613	}
	614
	615	static void v9fs_cache_unregister(void)
	616	{
	617	v9fs_destroy_inode_cache();
	618	#ifdef CONFIG_9P_FSCACHE
	619	fscache_unregister_netfs(&v9fs_cache_netfs);
	620	#endif
	621	}
	622
60e78d2c AK	623	/**
60e78d2c AK	624	* init_v9fs - Initialize module
9e82cf6a EVH	625	*
	626	*/
	627
	628	static int __init init_v9fs(void)
	629	{
60e78d2c	630	int err;
5d385153	631	pr_info("Installing v9fs 9p2000 file system support\n");
a80d923e	632	/* TODO: Setup list of registered trasnport modules */
60e78d2c AK	633
	634	err = v9fs_cache_register();
	635	if (err < 0) {
5d385153	636	pr_err("Failed to register v9fs for caching\n");
2226a288	637	return err;
60e78d2c AK	638	}
	639
	640	err = v9fs_sysfs_init();
	641	if (err < 0) {
5d385153	642	pr_err("Failed to register with sysfs\n");
2226a288 AV	643	goto out_cache;
	644	}
	645	err = register_filesystem(&v9fs_fs_type);
	646	if (err < 0) {
	647	pr_err("Failed to register filesystem\n");
60e78d2c AK	648	goto out_sysfs_cleanup;
	649	}
	650
	651	return 0;
	652
	653	out_sysfs_cleanup:
	654	v9fs_sysfs_cleanup();
	655
2226a288 AV	656	out_cache:
2226a288 AV	657	v9fs_cache_unregister();
60e78d2c AK	658
60e78d2c AK	659	return err;
9e82cf6a EVH	660	}
	661
	662	/**
60e78d2c	663	* exit_v9fs - shutdown module
9e82cf6a EVH	664	*
	665	*/
	666
	667	static void __exit exit_v9fs(void)
	668	{
60e78d2c AK	669	v9fs_sysfs_cleanup();
60e78d2c AK	670	v9fs_cache_unregister();
9e82cf6a EVH	671	unregister_filesystem(&v9fs_fs_type);
	672	}
	673
	674	module_init(init_v9fs)
	675	module_exit(exit_v9fs)
	676
bd238fb4	677	MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
9e82cf6a EVH	678	MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
	679	MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
	680	MODULE_LICENSE("GPL");