[linux-2.6-block.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/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>
9e82cf6a EVH	32	#include <linux/parser.h>
9e82cf6a EVH	33	#include <linux/idr.h>
5a0e3ad6	34	#include <linux/slab.h>
bd238fb4	35	#include <net/9p/9p.h>
bd238fb4	36	#include <net/9p/client.h>
8b81ef58	37	#include <net/9p/transport.h>
9e82cf6a	38	#include "v9fs.h"
9e82cf6a	39	#include "v9fs_vfs.h"
60e78d2c AK	40	#include "cache.h"
	41
	42	static DEFINE_SPINLOCK(v9fs_sessionlist_lock);
	43	static LIST_HEAD(v9fs_sessionlist);
a78ce05d	44	struct kmem_cache *v9fs_inode_cache;
9e82cf6a EVH	45
9e82cf6a EVH	46	/*
60e78d2c AK	47	* Option Parsing (code inspired by NFS code)
	48	* NOTE: each transport will parse its own options
	49	*/
9e82cf6a EVH	50
	51	enum {
	52	/* Options that take integer arguments */
8a0dc95f	53	Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid,
9e82cf6a	54	/* String options */
cb9af418	55	Opt_uname, Opt_remotename, Opt_cache, Opt_cachetag,
9e82cf6a	56	/* Options that take no arguments */
8a0dc95f	57	Opt_nodevmap,
e03abc0c	58	/* Cache options */
fb89b45c	59	Opt_cache_loose, Opt_fscache, Opt_mmap,
ba17674f	60	/* Access options */
e782ef71	61	Opt_access, Opt_posixacl,
9e82cf6a EVH	62	/* Error token */
	63	Opt_err
	64	};
	65
a447c093	66	static const match_table_t tokens = {
9e2f6688	67	{Opt_debug, "debug=%x"},
bd32b82d LI	68	{Opt_dfltuid, "dfltuid=%u"},
bd32b82d LI	69	{Opt_dfltgid, "dfltgid=%u"},
9e82cf6a	70	{Opt_afid, "afid=%u"},
67543e50	71	{Opt_uname, "uname=%s"},
9e82cf6a	72	{Opt_remotename, "aname=%s"},
9e82cf6a	73	{Opt_nodevmap, "nodevmap"},
60e78d2c	74	{Opt_cache, "cache=%s"},
e03abc0c	75	{Opt_cache_loose, "loose"},
60e78d2c	76	{Opt_fscache, "fscache"},
fb89b45c	77	{Opt_mmap, "mmap"},
60e78d2c	78	{Opt_cachetag, "cachetag=%s"},
ba17674f	79	{Opt_access, "access=%s"},
e782ef71	80	{Opt_posixacl, "posixacl"},
9e82cf6a EVH	81	{Opt_err, NULL}
	82	};
	83
a2dd43bb PK	84	/* Interpret mount options for cache mode */
	85	static int get_cache_mode(char *s)
	86	{
	87	int version = -EINVAL;
	88
	89	if (!strcmp(s, "loose")) {
	90	version = CACHE_LOOSE;
5d385153	91	p9_debug(P9_DEBUG_9P, "Cache mode: loose\n");
a2dd43bb PK	92	} else if (!strcmp(s, "fscache")) {
a2dd43bb PK	93	version = CACHE_FSCACHE;
5d385153	94	p9_debug(P9_DEBUG_9P, "Cache mode: fscache\n");
fb89b45c DM	95	} else if (!strcmp(s, "mmap")) {
	96	version = CACHE_MMAP;
	97	p9_debug(P9_DEBUG_9P, "Cache mode: mmap\n");
a2dd43bb PK	98	} else if (!strcmp(s, "none")) {
a2dd43bb PK	99	version = CACHE_NONE;
5d385153	100	p9_debug(P9_DEBUG_9P, "Cache mode: none\n");
a2dd43bb	101	} else
5d385153	102	pr_info("Unknown Cache mode %s\n", s);
a2dd43bb PK	103	return version;
	104	}
	105
9e82cf6a EVH	106	/**
9e82cf6a EVH	107	* v9fs_parse_options - parse mount options into session structure
9e82cf6a EVH	108	* @v9ses: existing v9fs session information
9e82cf6a EVH	109	*
ab31267d	110	* Return 0 upon success, -ERRNO upon failure.
9e82cf6a EVH	111	*/
9e82cf6a EVH	112
4b53e4b5	113	static int v9fs_parse_options(struct v9fs_session_info v9ses, char opts)
9e82cf6a	114	{
d8c8a9e3	115	char options, tmp_options;
9e82cf6a	116	substring_t args[MAX_OPT_ARGS];
a80d923e	117	char *p;
8a0dc95f	118	int option = 0;
ba17674f	119	char s, e;
ab31267d	120	int ret = 0;
9e82cf6a EVH	121
9e82cf6a EVH	122	/* setup defaults */
9e82cf6a EVH	123	v9ses->afid = ~0;
9e82cf6a EVH	124	v9ses->debug = 0;
a2dd43bb	125	v9ses->cache = CACHE_NONE;
60e78d2c AK	126	#ifdef CONFIG_9P_FSCACHE
	127	v9ses->cachetag = NULL;
	128	#endif
9e82cf6a	129
4b53e4b5	130	if (!opts)
ab31267d	131	return 0;
9e82cf6a	132
d8c8a9e3	133	tmp_options = kstrdup(opts, GFP_KERNEL);
bf2d29c6 EVH	134	if (!tmp_options) {
bf2d29c6 EVH	135	ret = -ENOMEM;
60e78d2c	136	goto fail_option_alloc;
bf2d29c6	137	}
d8c8a9e3	138	options = tmp_options;
ab31267d	139
9e82cf6a	140	while ((p = strsep(&options, ",")) != NULL) {
4d5077f1	141	int token, r;
9e82cf6a EVH	142	if (!*p)
	143	continue;
	144	token = match_token(p, tokens, args);
4d5077f1 AK	145	switch (token) {
	146	case Opt_debug:
	147	r = match_int(&args[0], &option);
ab31267d	148	if (r < 0) {
5d385153 JP	149	p9_debug(P9_DEBUG_ERROR,
5d385153 JP	150	"integer field, but no integer?\n");
ab31267d	151	ret = r;
9e82cf6a EVH	152	continue;
9e82cf6a EVH	153	}
9e2f6688	154	v9ses->debug = option;
10fa16e7	155	#ifdef CONFIG_NET_9P_DEBUG
9e2f6688	156	p9_debug_level = option;
10fa16e7	157	#endif
9e2f6688	158	break;
8a0dc95f	159
bd32b82d	160	case Opt_dfltuid:
4d5077f1 AK	161	r = match_int(&args[0], &option);
4d5077f1 AK	162	if (r < 0) {
5d385153 JP	163	p9_debug(P9_DEBUG_ERROR,
5d385153 JP	164	"integer field, but no integer?\n");
4d5077f1 AK	165	ret = r;
	166	continue;
	167	}
76ed23a5 EB	168	v9ses->dfltuid = make_kuid(current_user_ns(), option);
	169	if (!uid_valid(v9ses->dfltuid)) {
	170	p9_debug(P9_DEBUG_ERROR,
	171	"uid field, but not a uid?\n");
	172	ret = -EINVAL;
	173	continue;
	174	}
9e82cf6a	175	break;
bd32b82d	176	case Opt_dfltgid:
4d5077f1 AK	177	r = match_int(&args[0], &option);
4d5077f1 AK	178	if (r < 0) {
5d385153 JP	179	p9_debug(P9_DEBUG_ERROR,
5d385153 JP	180	"integer field, but no integer?\n");
4d5077f1 AK	181	ret = r;
	182	continue;
	183	}
76ed23a5 EB	184	v9ses->dfltgid = make_kgid(current_user_ns(), option);
	185	if (!gid_valid(v9ses->dfltgid)) {
	186	p9_debug(P9_DEBUG_ERROR,
	187	"gid field, but not a gid?\n");
	188	ret = -EINVAL;
	189	continue;
	190	}
9e82cf6a EVH	191	break;
9e82cf6a EVH	192	case Opt_afid:
4d5077f1 AK	193	r = match_int(&args[0], &option);
4d5077f1 AK	194	if (r < 0) {
5d385153 JP	195	p9_debug(P9_DEBUG_ERROR,
5d385153 JP	196	"integer field, but no integer?\n");
4d5077f1 AK	197	ret = r;
	198	continue;
	199	}
9e82cf6a EVH	200	v9ses->afid = option;
9e82cf6a EVH	201	break;
67543e50	202	case Opt_uname:
e549c133 JL	203	kfree(v9ses->uname);
	204	v9ses->uname = match_strdup(&args[0]);
	205	if (!v9ses->uname) {
	206	ret = -ENOMEM;
	207	goto free_and_return;
	208	}
9e82cf6a EVH	209	break;
9e82cf6a EVH	210	case Opt_remotename:
e549c133 JL	211	kfree(v9ses->aname);
	212	v9ses->aname = match_strdup(&args[0]);
	213	if (!v9ses->aname) {
	214	ret = -ENOMEM;
	215	goto free_and_return;
	216	}
9e82cf6a	217	break;
9e82cf6a EVH	218	case Opt_nodevmap:
	219	v9ses->nodev = 1;
	220	break;
e03abc0c EVH	221	case Opt_cache_loose:
	222	v9ses->cache = CACHE_LOOSE;
	223	break;
60e78d2c AK	224	case Opt_fscache:
	225	v9ses->cache = CACHE_FSCACHE;
	226	break;
fb89b45c DM	227	case Opt_mmap:
	228	v9ses->cache = CACHE_MMAP;
	229	break;
60e78d2c AK	230	case Opt_cachetag:
	231	#ifdef CONFIG_9P_FSCACHE
	232	v9ses->cachetag = match_strdup(&args[0]);
	233	#endif
	234	break;
	235	case Opt_cache:
	236	s = match_strdup(&args[0]);
bf2d29c6 EVH	237	if (!s) {
bf2d29c6 EVH	238	ret = -ENOMEM;
5d385153 JP	239	p9_debug(P9_DEBUG_ERROR,
5d385153 JP	240	"problem allocating copy of cache arg\n");
bf2d29c6 EVH	241	goto free_and_return;
bf2d29c6 EVH	242	}
a2dd43bb PK	243	ret = get_cache_mode(s);
	244	if (ret == -EINVAL) {
	245	kfree(s);
	246	goto free_and_return;
	247	}
60e78d2c	248
a2dd43bb	249	v9ses->cache = ret;
60e78d2c AK	250	kfree(s);
60e78d2c AK	251	break;
ba17674f LI	252
	253	case Opt_access:
	254	s = match_strdup(&args[0]);
bf2d29c6 EVH	255	if (!s) {
bf2d29c6 EVH	256	ret = -ENOMEM;
5d385153 JP	257	p9_debug(P9_DEBUG_ERROR,
5d385153 JP	258	"problem allocating copy of access arg\n");
bf2d29c6 EVH	259	goto free_and_return;
bf2d29c6 EVH	260	}
60e78d2c	261
ba17674f LI	262	v9ses->flags &= ~V9FS_ACCESS_MASK;
	263	if (strcmp(s, "user") == 0)
	264	v9ses->flags \|= V9FS_ACCESS_USER;
	265	else if (strcmp(s, "any") == 0)
	266	v9ses->flags \|= V9FS_ACCESS_ANY;
76381a42	267	else if (strcmp(s, "client") == 0) {
76381a42	268	v9ses->flags \|= V9FS_ACCESS_CLIENT;
76381a42	269	} else {
76ed23a5	270	uid_t uid;
ba17674f	271	v9ses->flags \|= V9FS_ACCESS_SINGLE;
76ed23a5	272	uid = simple_strtoul(s, &e, 10);
a2dd43bb PK	273	if (*e != '\0') {
a2dd43bb PK	274	ret = -EINVAL;
5d385153 JP	275	pr_info("Unknown access argument %s\n",
5d385153 JP	276	s);
a2dd43bb PK	277	kfree(s);
	278	goto free_and_return;
	279	}
76ed23a5 EB	280	v9ses->uid = make_kuid(current_user_ns(), uid);
	281	if (!uid_valid(v9ses->uid)) {
	282	ret = -EINVAL;
	283	pr_info("Uknown uid %s\n", s);
	284	kfree(s);
	285	goto free_and_return;
	286	}
ba17674f	287	}
a2dd43bb	288
0a976297	289	kfree(s);
ba17674f LI	290	break;
ba17674f LI	291
e782ef71 VJJ	292	case Opt_posixacl:
	293	#ifdef CONFIG_9P_FS_POSIX_ACL
	294	v9ses->flags \|= V9FS_POSIX_ACL;
	295	#else
5d385153 JP	296	p9_debug(P9_DEBUG_ERROR,
5d385153 JP	297	"Not defined CONFIG_9P_FS_POSIX_ACL. Ignoring posixacl option\n");
e782ef71 VJJ	298	#endif
	299	break;
	300
9e82cf6a EVH	301	default:
	302	continue;
	303	}
	304	}
d8c8a9e3	305
bf2d29c6	306	free_and_return:
d8c8a9e3	307	kfree(tmp_options);
60e78d2c	308	fail_option_alloc:
bf2d29c6	309	return ret;
9e82cf6a EVH	310	}
9e82cf6a EVH	311
9e82cf6a EVH	312	/**
	313	* v9fs_session_init - initialize session
	314	* @v9ses: session information structure
	315	* @dev_name: device being mounted
	316	* @data: options
	317	*
	318	*/
	319
bd238fb4	320	struct p9_fid v9fs_session_init(struct v9fs_session_info v9ses,
9e82cf6a EVH	321	const char dev_name, char data)
9e82cf6a EVH	322	{
bd238fb4	323	struct p9_fid *fid;
412a19b6	324	int rc = -ENOMEM;
9e82cf6a	325
e549c133	326	v9ses->uname = kstrdup(V9FS_DEFUSER, GFP_KERNEL);
ba17674f	327	if (!v9ses->uname)
412a19b6	328	goto err_names;
9e82cf6a	329
e549c133	330	v9ses->aname = kstrdup(V9FS_DEFANAME, GFP_KERNEL);
412a19b6 TH	331	if (!v9ses->aname)
412a19b6 TH	332	goto err_names;
a534c8d1	333	init_rwsem(&v9ses->rename_sem);
9e82cf6a	334
b4caecd4	335	rc = bdi_setup_and_register(&v9ses->bdi, "9p");
412a19b6 TH	336	if (rc)
412a19b6 TH	337	goto err_names;
60e78d2c	338
76ed23a5	339	v9ses->uid = INVALID_UID;
bd32b82d LI	340	v9ses->dfltuid = V9FS_DEFUID;
bd32b82d LI	341	v9ses->dfltgid = V9FS_DEFGID;
ab31267d	342
4b53e4b5	343	v9ses->clnt = p9_client_create(dev_name, data);
bd238fb4	344	if (IS_ERR(v9ses->clnt)) {
412a19b6	345	rc = PTR_ERR(v9ses->clnt);
5d385153	346	p9_debug(P9_DEBUG_ERROR, "problem initializing 9p client\n");
412a19b6	347	goto err_bdi;
9e82cf6a EVH	348	}
9e82cf6a EVH	349
6752a1eb VJJ	350	v9ses->flags = V9FS_ACCESS_USER;
	351
	352	if (p9_is_proto_dotl(v9ses->clnt)) {
	353	v9ses->flags = V9FS_ACCESS_CLIENT;
476ada04	354	v9ses->flags \|= V9FS_PROTO_2000L;
6752a1eb	355	} else if (p9_is_proto_dotu(v9ses->clnt)) {
476ada04	356	v9ses->flags \|= V9FS_PROTO_2000U;
6752a1eb VJJ	357	}
	358
	359	rc = v9fs_parse_options(v9ses, data);
412a19b6 TH	360	if (rc < 0)
412a19b6 TH	361	goto err_clnt;
ba17674f	362
fbedadc1	363	v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ;
8a0dc95f	364
76381a42 AK	365	if (!v9fs_proto_dotl(v9ses) &&
	366	((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
	367	/*
	368	* We support ACCESS_CLIENT only for dotl.
	369	* Fall back to ACCESS_USER
	370	*/
	371	v9ses->flags &= ~V9FS_ACCESS_MASK;
	372	v9ses->flags \|= V9FS_ACCESS_USER;
	373	}
	374	/FIXME !! /
ba17674f	375	/* for legacy mode, fall back to V9FS_ACCESS_ANY */
9ffaf63e	376	if (!(v9fs_proto_dotu(v9ses) \|\| v9fs_proto_dotl(v9ses)) &&
ba17674f LI	377	((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {
	378
	379	v9ses->flags &= ~V9FS_ACCESS_MASK;
	380	v9ses->flags \|= V9FS_ACCESS_ANY;
76ed23a5	381	v9ses->uid = INVALID_UID;
ba17674f	382	}
e782ef71 VJJ	383	if (!v9fs_proto_dotl(v9ses) \|\|
	384	!((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) {
	385	/*
	386	* We support ACL checks on clinet only if the protocol is
	387	* 9P2000.L and access is V9FS_ACCESS_CLIENT.
	388	*/
	389	v9ses->flags &= ~V9FS_ACL_MASK;
	390	}
ba17674f	391
f791f7c5	392	fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, INVALID_UID,
ba17674f	393	v9ses->aname);
bd238fb4	394	if (IS_ERR(fid)) {
412a19b6	395	rc = PTR_ERR(fid);
5d385153	396	p9_debug(P9_DEBUG_ERROR, "cannot attach\n");
412a19b6	397	goto err_clnt;
9e82cf6a EVH	398	}
9e82cf6a EVH	399
ba17674f LI	400	if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE)
	401	fid->uid = v9ses->uid;
	402	else
b4642556	403	fid->uid = INVALID_UID;
ba17674f	404
60e78d2c AK	405	#ifdef CONFIG_9P_FSCACHE
	406	/* register the session for caching */
	407	v9fs_cache_session_get_cookie(v9ses);
	408	#endif
412a19b6 TH	409	spin_lock(&v9fs_sessionlist_lock);
	410	list_add(&v9ses->slist, &v9fs_sessionlist);
	411	spin_unlock(&v9fs_sessionlist_lock);
60e78d2c	412
bd238fb4	413	return fid;
9e82cf6a	414
412a19b6 TH	415	err_clnt:
	416	p9_client_destroy(v9ses->clnt);
	417	err_bdi:
0ed07ddb	418	bdi_destroy(&v9ses->bdi);
412a19b6 TH	419	err_names:
	420	kfree(v9ses->uname);
	421	kfree(v9ses->aname);
	422	return ERR_PTR(rc);
9e82cf6a EVH	423	}
	424
	425	/**
	426	* v9fs_session_close - shutdown a session
	427	* @v9ses: session information structure
	428	*
	429	*/
	430
	431	void v9fs_session_close(struct v9fs_session_info *v9ses)
	432	{
bd238fb4 LI	433	if (v9ses->clnt) {
	434	p9_client_destroy(v9ses->clnt);
	435	v9ses->clnt = NULL;
3cf6429a	436	}
9e82cf6a	437
60e78d2c AK	438	#ifdef CONFIG_9P_FSCACHE
	439	if (v9ses->fscache) {
	440	v9fs_cache_session_put_cookie(v9ses);
	441	kfree(v9ses->cachetag);
	442	}
	443	#endif
e549c133 JL	444	kfree(v9ses->uname);
e549c133 JL	445	kfree(v9ses->aname);
60e78d2c	446
0ed07ddb JA	447	bdi_destroy(&v9ses->bdi);
0ed07ddb JA	448
60e78d2c AK	449	spin_lock(&v9fs_sessionlist_lock);
	450	list_del(&v9ses->slist);
	451	spin_unlock(&v9fs_sessionlist_lock);
9e82cf6a EVH	452	}
9e82cf6a EVH	453
322b329a	454	/**
ee443996 EVH	455	* v9fs_session_cancel - terminate a session
	456	* @v9ses: session to terminate
	457	*
	458	* mark transport as disconnected and cancel all pending requests.
322b329a	459	*/
ee443996	460
322b329a	461	void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
5d385153	462	p9_debug(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
bd238fb4	463	p9_client_disconnect(v9ses->clnt);
322b329a EVH	464	}
322b329a EVH	465
6d96d3ab AK	466	/**
	467	* v9fs_session_begin_cancel - Begin terminate of a session
	468	* @v9ses: session to terminate
	469	*
	470	* After this call we don't allow any request other than clunk.
	471	*/
	472
	473	void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses)
	474	{
5d385153	475	p9_debug(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses);
6d96d3ab AK	476	p9_client_begin_disconnect(v9ses->clnt);
	477	}
	478
9e82cf6a EVH	479	extern int v9fs_error_init(void);
9e82cf6a EVH	480
60e78d2c AK	481	static struct kobject *v9fs_kobj;
	482
	483	#ifdef CONFIG_9P_FSCACHE
9e82cf6a	484	/**
60e78d2c AK	485	* caches_show - list caches associated with a session
	486	*
	487	* Returns the size of buffer written.
	488	*/
	489
	490	static ssize_t caches_show(struct kobject *kobj,
	491	struct kobj_attribute *attr,
	492	char *buf)
	493	{
	494	ssize_t n = 0, count = 0, limit = PAGE_SIZE;
	495	struct v9fs_session_info *v9ses;
	496
	497	spin_lock(&v9fs_sessionlist_lock);
	498	list_for_each_entry(v9ses, &v9fs_sessionlist, slist) {
	499	if (v9ses->cachetag) {
	500	n = snprintf(buf, limit, "%s\n", v9ses->cachetag);
	501	if (n < 0) {
	502	count = n;
	503	break;
	504	}
	505
	506	count += n;
	507	limit -= n;
	508	}
	509	}
	510
	511	spin_unlock(&v9fs_sessionlist_lock);
	512	return count;
	513	}
	514
	515	static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches);
	516	#endif /* CONFIG_9P_FSCACHE */
	517
	518	static struct attribute *v9fs_attrs[] = {
	519	#ifdef CONFIG_9P_FSCACHE
	520	&v9fs_attr_cache.attr,
	521	#endif
	522	NULL,
	523	};
	524
	525	static struct attribute_group v9fs_attr_group = {
	526	.attrs = v9fs_attrs,
	527	};
	528
	529	/**
	530	* v9fs_sysfs_init - Initialize the v9fs sysfs interface
	531	*
	532	*/
	533
bdbeacde	534	static int __init v9fs_sysfs_init(void)
60e78d2c AK	535	{
	536	v9fs_kobj = kobject_create_and_add("9p", fs_kobj);
	537	if (!v9fs_kobj)
	538	return -ENOMEM;
	539
	540	if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) {
	541	kobject_put(v9fs_kobj);
	542	return -ENOMEM;
	543	}
	544
	545	return 0;
	546	}
	547
	548	/**
	549	* v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface
	550	*
	551	*/
	552
	553	static void v9fs_sysfs_cleanup(void)
	554	{
	555	sysfs_remove_group(v9fs_kobj, &v9fs_attr_group);
	556	kobject_put(v9fs_kobj);
	557	}
	558
a78ce05d AK	559	static void v9fs_inode_init_once(void *foo)
	560	{
	561	struct v9fs_inode v9inode = (struct v9fs_inode )foo;
	562	#ifdef CONFIG_9P_FSCACHE
	563	v9inode->fscache = NULL;
a78ce05d	564	#endif
fd2421f5	565	memset(&v9inode->qid, 0, sizeof(v9inode->qid));
a78ce05d AK	566	inode_init_once(&v9inode->vfs_inode);
	567	}
	568
	569	/**
	570	* v9fs_init_inode_cache - initialize a cache for 9P
	571	* Returns 0 on success.
	572	*/
	573	static int v9fs_init_inode_cache(void)
	574	{
	575	v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache",
	576	sizeof(struct v9fs_inode),
	577	0, (SLAB_RECLAIM_ACCOUNT\|
5d097056	578	SLAB_MEM_SPREAD\|SLAB_ACCOUNT),
a78ce05d AK	579	v9fs_inode_init_once);
	580	if (!v9fs_inode_cache)
	581	return -ENOMEM;
	582
	583	return 0;
	584	}
	585
	586	/**
	587	* v9fs_destroy_inode_cache - destroy the cache of 9P inode
	588	*
	589	*/
	590	static void v9fs_destroy_inode_cache(void)
	591	{
8c0a8537 KS	592	/*
	593	* Make sure all delayed rcu free inodes are flushed before we
	594	* destroy cache.
	595	*/
	596	rcu_barrier();
a78ce05d AK	597	kmem_cache_destroy(v9fs_inode_cache);
	598	}
	599
	600	static int v9fs_cache_register(void)
	601	{
	602	int ret;
	603	ret = v9fs_init_inode_cache();
	604	if (ret < 0)
	605	return ret;
	606	#ifdef CONFIG_9P_FSCACHE
8061a6fa AV	607	ret = fscache_register_netfs(&v9fs_cache_netfs);
	608	if (ret < 0)
	609	v9fs_destroy_inode_cache();
a78ce05d	610	#endif
8061a6fa	611	return ret;
a78ce05d AK	612	}
	613
	614	static void v9fs_cache_unregister(void)
	615	{
	616	v9fs_destroy_inode_cache();
	617	#ifdef CONFIG_9P_FSCACHE
	618	fscache_unregister_netfs(&v9fs_cache_netfs);
	619	#endif
	620	}
	621
60e78d2c AK	622	/**
60e78d2c AK	623	* init_v9fs - Initialize module
9e82cf6a EVH	624	*
	625	*/
	626
	627	static int __init init_v9fs(void)
	628	{
60e78d2c	629	int err;
5d385153	630	pr_info("Installing v9fs 9p2000 file system support\n");
a80d923e	631	/* TODO: Setup list of registered trasnport modules */
60e78d2c AK	632
	633	err = v9fs_cache_register();
	634	if (err < 0) {
5d385153	635	pr_err("Failed to register v9fs for caching\n");
2226a288	636	return err;
60e78d2c AK	637	}
	638
	639	err = v9fs_sysfs_init();
	640	if (err < 0) {
5d385153	641	pr_err("Failed to register with sysfs\n");
2226a288 AV	642	goto out_cache;
	643	}
	644	err = register_filesystem(&v9fs_fs_type);
	645	if (err < 0) {
	646	pr_err("Failed to register filesystem\n");
60e78d2c AK	647	goto out_sysfs_cleanup;
	648	}
	649
	650	return 0;
	651
	652	out_sysfs_cleanup:
	653	v9fs_sysfs_cleanup();
	654
2226a288 AV	655	out_cache:
2226a288 AV	656	v9fs_cache_unregister();
60e78d2c AK	657
60e78d2c AK	658	return err;
9e82cf6a EVH	659	}
	660
	661	/**
60e78d2c	662	* exit_v9fs - shutdown module
9e82cf6a EVH	663	*
	664	*/
	665
	666	static void __exit exit_v9fs(void)
	667	{
60e78d2c AK	668	v9fs_sysfs_cleanup();
60e78d2c AK	669	v9fs_cache_unregister();
9e82cf6a EVH	670	unregister_filesystem(&v9fs_fs_type);
	671	}
	672
	673	module_init(init_v9fs)
	674	module_exit(exit_v9fs)
	675
bd238fb4	676	MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
9e82cf6a EVH	677	MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
	678	MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
	679	MODULE_LICENSE("GPL");