[net-next-2.6.git] / fs / 9p / v9fs.c

/*
 *  linux/fs/9p/v9fs.c
 *
 *  This file contains functions assisting in mapping VFS to 9P2000
 *
 *  Copyright (C) 2004 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
 *
 */

#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 <net/9p/9p.h>
#include <net/9p/transport.h>
#include <net/9p/conn.h>
#include <net/9p/client.h>
#include "v9fs.h"
#include "v9fs_vfs.h"

/*
 * Dynamic Transport Registration Routines
 *
 */

static LIST_HEAD(v9fs_trans_list);
static struct p9_trans_module *v9fs_default_trans;

/**
 * v9fs_register_trans - register a new transport with 9p
 * @m - structure describing the transport module and entry points
 *
 */
void v9fs_register_trans(struct p9_trans_module *m)
{
	list_add_tail(&m->list, &v9fs_trans_list);
	if (m->def)
		v9fs_default_trans = m;
}
EXPORT_SYMBOL(v9fs_register_trans);

/**
 * v9fs_match_trans - match transport versus registered transports
 * @arg: string identifying transport
 *
 */
static struct p9_trans_module *v9fs_match_trans(const substring_t *name)
{
	struct list_head *p;
	struct p9_trans_module *t = NULL;

	list_for_each(p, &v9fs_trans_list) {
		t = list_entry(p, struct p9_trans_module, list);
		if (strncmp(t->name, name->from, name->to-name->from) == 0) {
			P9_DPRINTK(P9_DEBUG_TRANS, "trans=%s\n", t->name);
			break;
		}
	}
	return t;
}

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

enum {
	/* Options that take integer arguments */
	Opt_debug, Opt_msize, Opt_dfltuid, Opt_dfltgid, Opt_afid,
	/* String options */
	Opt_uname, Opt_remotename, Opt_trans,
	/* Options that take no arguments */
	Opt_legacy, Opt_nodevmap,
	/* Cache options */
	Opt_cache_loose,
	/* Access options */
	Opt_access,
	/* Error token */
	Opt_err
};

static match_table_t tokens = {
	{Opt_debug, "debug=%x"},
	{Opt_msize, "msize=%u"},
	{Opt_dfltuid, "dfltuid=%u"},
	{Opt_dfltgid, "dfltgid=%u"},
	{Opt_afid, "afid=%u"},
	{Opt_uname, "uname=%s"},
	{Opt_remotename, "aname=%s"},
	{Opt_trans, "trans=%s"},
	{Opt_legacy, "noextend"},
	{Opt_nodevmap, "nodevmap"},
	{Opt_cache_loose, "cache=loose"},
	{Opt_cache_loose, "loose"},
	{Opt_access, "access=%s"},
	{Opt_err, NULL}
};

/**
 * v9fs_parse_options - parse mount options into session structure
 * @options: options string passed from mount
 * @v9ses: existing v9fs session information
 *
 */

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

	/* setup defaults */
	v9ses->maxdata = 8192;
	v9ses->afid = ~0;
	v9ses->debug = 0;
	v9ses->cache = 0;
	v9ses->trans = v9fs_default_trans;

	if (!options)
		return;

	while ((p = strsep(&options, ",")) != NULL) {
		int token;
		if (!*p)
			continue;
		token = match_token(p, tokens, args);
		if (token < Opt_uname) {
			if ((ret = match_int(&args[0], &option)) < 0) {
				P9_DPRINTK(P9_DEBUG_ERROR,
					"integer field, but no integer?\n");
				continue;
			}
		}
		switch (token) {
		case Opt_debug:
			v9ses->debug = option;
#ifdef CONFIG_NET_9P_DEBUG
			p9_debug_level = option;
#endif
			break;
		case Opt_msize:
			v9ses->maxdata = option;
			break;
		case Opt_dfltuid:
			v9ses->dfltuid = option;
			break;
		case Opt_dfltgid:
			v9ses->dfltgid = option;
			break;
		case Opt_afid:
			v9ses->afid = option;
			break;
		case Opt_trans:
			v9ses->trans = v9fs_match_trans(&args[0]);
			break;
		case Opt_uname:
			match_strcpy(v9ses->uname, &args[0]);
			break;
		case Opt_remotename:
			match_strcpy(v9ses->aname, &args[0]);
			break;
		case Opt_legacy:
			v9ses->flags &= ~V9FS_EXTENDED;
			break;
		case Opt_nodevmap:
			v9ses->nodev = 1;
			break;
		case Opt_cache_loose:
			v9ses->cache = CACHE_LOOSE;
			break;

		case Opt_access:
			s = match_strdup(&args[0]);
			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 {
				v9ses->flags |= V9FS_ACCESS_SINGLE;
				v9ses->uid = simple_strtol(s, &e, 10);
				if (*e != '\0')
					v9ses->uid = ~0;
			}
			break;

		default:
			continue;
		}
	}
}

/**
 * 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)
{
	int retval = -EINVAL;
	struct p9_trans *trans = NULL;
	struct p9_fid *fid;

	v9ses->uname = __getname();
	if (!v9ses->uname)
		return ERR_PTR(-ENOMEM);

	v9ses->aname = __getname();
	if (!v9ses->aname) {
		__putname(v9ses->uname);
		return ERR_PTR(-ENOMEM);
	}

	v9ses->flags = V9FS_EXTENDED | V9FS_ACCESS_USER;
	strcpy(v9ses->uname, V9FS_DEFUSER);
	strcpy(v9ses->aname, V9FS_DEFANAME);
	v9ses->uid = ~0;
	v9ses->dfltuid = V9FS_DEFUID;
	v9ses->dfltgid = V9FS_DEFGID;
	v9ses->options = kstrdup(data, GFP_KERNEL);
	v9fs_parse_options(v9ses);

	if ((v9ses->trans == NULL) && !list_empty(&v9fs_trans_list))
		v9ses->trans = list_first_entry(&v9fs_trans_list,
		 struct p9_trans_module, list);

	if (v9ses->trans == NULL) {
		retval = -EPROTONOSUPPORT;
		P9_DPRINTK(P9_DEBUG_ERROR,
				"No transport defined or default transport\n");
		goto error;
	}

	trans = v9ses->trans->create(dev_name, v9ses->options);
	if (IS_ERR(trans)) {
		retval = PTR_ERR(trans);
		trans = NULL;
		goto error;
	}
	if ((v9ses->maxdata+P9_IOHDRSZ) > v9ses->trans->maxsize)
		v9ses->maxdata = v9ses->trans->maxsize-P9_IOHDRSZ;

	v9ses->clnt = p9_client_create(trans, v9ses->maxdata+P9_IOHDRSZ,
		v9fs_extended(v9ses));

	if (IS_ERR(v9ses->clnt)) {
		retval = PTR_ERR(v9ses->clnt);
		v9ses->clnt = NULL;
		P9_DPRINTK(P9_DEBUG_ERROR, "problem initializing 9p client\n");
		goto error;
	}

	if (!v9ses->clnt->dotu)
		v9ses->flags &= ~V9FS_EXTENDED;

	/* for legacy mode, fall back to V9FS_ACCESS_ANY */
	if (!v9fs_extended(v9ses) &&
		((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {

		v9ses->flags &= ~V9FS_ACCESS_MASK;
		v9ses->flags |= V9FS_ACCESS_ANY;
		v9ses->uid = ~0;
	}

	fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, ~0,
							v9ses->aname);
	if (IS_ERR(fid)) {
		retval = PTR_ERR(fid);
		fid = NULL;
		P9_DPRINTK(P9_DEBUG_ERROR, "cannot attach\n");
		goto error;
	}

	if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE)
		fid->uid = v9ses->uid;
	else
		fid->uid = ~0;

	return fid;

error:
	v9fs_session_close(v9ses);
	return ERR_PTR(retval);
}

/**
 * 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;
	}

	__putname(v9ses->uname);
	__putname(v9ses->aname);
	kfree(v9ses->options);
}

/**
 * v9fs_session_cancel - mark transport as disconnected
 * 	and cancel all pending requests.
 */
void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
	P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
	p9_client_disconnect(v9ses->clnt);
}

extern int v9fs_error_init(void);

/**
 * v9fs_init - Initialize module
 *
 */

static int __init init_v9fs(void)
{
	printk(KERN_INFO "Installing v9fs 9p2000 file system support\n");
	/* TODO: Setup list of registered trasnport modules */
	return register_filesystem(&v9fs_fs_type);
}

/**
 * v9fs_init - shutdown module
 *
 */

static void __exit exit_v9fs(void)
{
	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	*
	6	* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
	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
9e82cf6a EVH	26	#include <linux/module.h>
	27	#include <linux/errno.h>
	28	#include <linux/fs.h>
914e2637	29	#include <linux/sched.h>
9e82cf6a EVH	30	#include <linux/parser.h>
9e82cf6a EVH	31	#include <linux/idr.h>
bd238fb4 LI	32	#include <net/9p/9p.h>
	33	#include <net/9p/transport.h>
	34	#include <net/9p/conn.h>
	35	#include <net/9p/client.h>
9e82cf6a	36	#include "v9fs.h"
9e82cf6a	37	#include "v9fs_vfs.h"
9e82cf6a	38
a80d923e EVH	39	/*
	40	* Dynamic Transport Registration Routines
	41	*
	42	*/
	43
	44	static LIST_HEAD(v9fs_trans_list);
	45	static struct p9_trans_module *v9fs_default_trans;
	46
	47	/**
	48	* v9fs_register_trans - register a new transport with 9p
	49	* @m - structure describing the transport module and entry points
	50	*
	51	*/
	52	void v9fs_register_trans(struct p9_trans_module *m)
	53	{
	54	list_add_tail(&m->list, &v9fs_trans_list);
	55	if (m->def)
	56	v9fs_default_trans = m;
	57	}
	58	EXPORT_SYMBOL(v9fs_register_trans);
	59
	60	/**
	61	* v9fs_match_trans - match transport versus registered transports
	62	* @arg: string identifying transport
	63	*
	64	*/
	65	static struct p9_trans_module v9fs_match_trans(const substring_t name)
	66	{
	67	struct list_head *p;
	68	struct p9_trans_module *t = NULL;
	69
	70	list_for_each(p, &v9fs_trans_list) {
	71	t = list_entry(p, struct p9_trans_module, list);
	72	if (strncmp(t->name, name->from, name->to-name->from) == 0) {
	73	P9_DPRINTK(P9_DEBUG_TRANS, "trans=%s\n", t->name);
	74	break;
	75	}
	76	}
	77	return t;
	78	}
	79
9e82cf6a EVH	80	/*
9e82cf6a EVH	81	* Option Parsing (code inspired by NFS code)
a80d923e	82	* NOTE: each transport will parse its own options
9e82cf6a EVH	83	*/
	84
	85	enum {
	86	/* Options that take integer arguments */
bd32b82d	87	Opt_debug, Opt_msize, Opt_dfltuid, Opt_dfltgid, Opt_afid,
9e82cf6a	88	/* String options */
a80d923e	89	Opt_uname, Opt_remotename, Opt_trans,
9e82cf6a	90	/* Options that take no arguments */
a80d923e	91	Opt_legacy, Opt_nodevmap,
e03abc0c EVH	92	/* Cache options */
e03abc0c EVH	93	Opt_cache_loose,
ba17674f LI	94	/* Access options */
ba17674f LI	95	Opt_access,
9e82cf6a EVH	96	/* Error token */
	97	Opt_err
	98	};
	99
	100	static match_table_t tokens = {
9e2f6688	101	{Opt_debug, "debug=%x"},
9e82cf6a	102	{Opt_msize, "msize=%u"},
bd32b82d LI	103	{Opt_dfltuid, "dfltuid=%u"},
bd32b82d LI	104	{Opt_dfltgid, "dfltgid=%u"},
9e82cf6a	105	{Opt_afid, "afid=%u"},
67543e50	106	{Opt_uname, "uname=%s"},
9e82cf6a	107	{Opt_remotename, "aname=%s"},
a80d923e	108	{Opt_trans, "trans=%s"},
9e82cf6a EVH	109	{Opt_legacy, "noextend"},
9e82cf6a EVH	110	{Opt_nodevmap, "nodevmap"},
e03abc0c EVH	111	{Opt_cache_loose, "cache=loose"},
e03abc0c EVH	112	{Opt_cache_loose, "loose"},
ba17674f	113	{Opt_access, "access=%s"},
9e82cf6a EVH	114	{Opt_err, NULL}
	115	};
	116
9e82cf6a EVH	117	/**
	118	* v9fs_parse_options - parse mount options into session structure
	119	* @options: options string passed from mount
	120	* @v9ses: existing v9fs session information
	121	*
	122	*/
	123
a80d923e	124	static void v9fs_parse_options(struct v9fs_session_info *v9ses)
9e82cf6a	125	{
a80d923e	126	char *options = v9ses->options;
9e82cf6a	127	substring_t args[MAX_OPT_ARGS];
a80d923e	128	char *p;
9e82cf6a EVH	129	int option;
9e82cf6a EVH	130	int ret;
ba17674f	131	char s, e;
9e82cf6a EVH	132
9e82cf6a EVH	133	/* setup defaults */
a80d923e	134	v9ses->maxdata = 8192;
9e82cf6a EVH	135	v9ses->afid = ~0;
9e82cf6a EVH	136	v9ses->debug = 0;
e03abc0c	137	v9ses->cache = 0;
a80d923e	138	v9ses->trans = v9fs_default_trans;
9e82cf6a EVH	139
	140	if (!options)
	141	return;
	142
	143	while ((p = strsep(&options, ",")) != NULL) {
	144	int token;
	145	if (!*p)
	146	continue;
	147	token = match_token(p, tokens, args);
67543e50	148	if (token < Opt_uname) {
9e82cf6a	149	if ((ret = match_int(&args[0], &option)) < 0) {
bd238fb4	150	P9_DPRINTK(P9_DEBUG_ERROR,
9e82cf6a EVH	151	"integer field, but no integer?\n");
	152	continue;
	153	}
9e82cf6a EVH	154	}
9e82cf6a EVH	155	switch (token) {
9e2f6688 EVH	156	case Opt_debug:
9e2f6688 EVH	157	v9ses->debug = option;
10fa16e7	158	#ifdef CONFIG_NET_9P_DEBUG
9e2f6688	159	p9_debug_level = option;
10fa16e7	160	#endif
9e2f6688	161	break;
9e82cf6a EVH	162	case Opt_msize:
	163	v9ses->maxdata = option;
	164	break;
bd32b82d LI	165	case Opt_dfltuid:
bd32b82d LI	166	v9ses->dfltuid = option;
9e82cf6a	167	break;
bd32b82d LI	168	case Opt_dfltgid:
bd32b82d LI	169	v9ses->dfltgid = option;
9e82cf6a EVH	170	break;
	171	case Opt_afid:
	172	v9ses->afid = option;
	173	break;
a80d923e EVH	174	case Opt_trans:
a80d923e EVH	175	v9ses->trans = v9fs_match_trans(&args[0]);
9e82cf6a	176	break;
67543e50	177	case Opt_uname:
ba17674f	178	match_strcpy(v9ses->uname, &args[0]);
9e82cf6a EVH	179	break;
9e82cf6a EVH	180	case Opt_remotename:
ba17674f	181	match_strcpy(v9ses->aname, &args[0]);
9e82cf6a EVH	182	break;
9e82cf6a EVH	183	case Opt_legacy:
2405669b	184	v9ses->flags &= ~V9FS_EXTENDED;
9e82cf6a EVH	185	break;
	186	case Opt_nodevmap:
	187	v9ses->nodev = 1;
	188	break;
e03abc0c EVH	189	case Opt_cache_loose:
	190	v9ses->cache = CACHE_LOOSE;
	191	break;
ba17674f LI	192
	193	case Opt_access:
	194	s = match_strdup(&args[0]);
	195	v9ses->flags &= ~V9FS_ACCESS_MASK;
	196	if (strcmp(s, "user") == 0)
	197	v9ses->flags \|= V9FS_ACCESS_USER;
	198	else if (strcmp(s, "any") == 0)
	199	v9ses->flags \|= V9FS_ACCESS_ANY;
	200	else {
	201	v9ses->flags \|= V9FS_ACCESS_SINGLE;
	202	v9ses->uid = simple_strtol(s, &e, 10);
	203	if (*e != '\0')
	204	v9ses->uid = ~0;
	205	}
	206	break;
	207
9e82cf6a EVH	208	default:
	209	continue;
	210	}
	211	}
	212	}
	213
9e82cf6a EVH	214	/**
	215	* v9fs_session_init - initialize session
	216	* @v9ses: session information structure
	217	* @dev_name: device being mounted
	218	* @data: options
	219	*
	220	*/
	221
bd238fb4	222	struct p9_fid v9fs_session_init(struct v9fs_session_info v9ses,
9e82cf6a EVH	223	const char dev_name, char data)
9e82cf6a EVH	224	{
9e82cf6a	225	int retval = -EINVAL;
a80d923e	226	struct p9_trans *trans = NULL;
bd238fb4	227	struct p9_fid *fid;
9e82cf6a	228
ba17674f LI	229	v9ses->uname = __getname();
ba17674f LI	230	if (!v9ses->uname)
bd238fb4	231	return ERR_PTR(-ENOMEM);
9e82cf6a	232
ba17674f LI	233	v9ses->aname = __getname();
	234	if (!v9ses->aname) {
	235	__putname(v9ses->uname);
bd238fb4	236	return ERR_PTR(-ENOMEM);
9e82cf6a EVH	237	}
9e82cf6a EVH	238
ba17674f LI	239	v9ses->flags = V9FS_EXTENDED \| V9FS_ACCESS_USER;
	240	strcpy(v9ses->uname, V9FS_DEFUSER);
	241	strcpy(v9ses->aname, V9FS_DEFANAME);
	242	v9ses->uid = ~0;
bd32b82d LI	243	v9ses->dfltuid = V9FS_DEFUID;
bd32b82d LI	244	v9ses->dfltgid = V9FS_DEFGID;
a80d923e EVH	245	v9ses->options = kstrdup(data, GFP_KERNEL);
	246	v9fs_parse_options(v9ses);
	247
	248	if ((v9ses->trans == NULL) && !list_empty(&v9fs_trans_list))
	249	v9ses->trans = list_first_entry(&v9fs_trans_list,
	250	struct p9_trans_module, list);
	251
	252	if (v9ses->trans == NULL) {
	253	retval = -EPROTONOSUPPORT;
	254	P9_DPRINTK(P9_DEBUG_ERROR,
	255	"No transport defined or default transport\n");
bd238fb4	256	goto error;
a80d923e	257	}
9e82cf6a	258
a80d923e	259	trans = v9ses->trans->create(dev_name, v9ses->options);
bd238fb4 LI	260	if (IS_ERR(trans)) {
	261	retval = PTR_ERR(trans);
	262	trans = NULL;
	263	goto error;
a8e63bff	264	}
a80d923e EVH	265	if ((v9ses->maxdata+P9_IOHDRSZ) > v9ses->trans->maxsize)
a80d923e EVH	266	v9ses->maxdata = v9ses->trans->maxsize-P9_IOHDRSZ;
a8e63bff	267
a80d923e	268	v9ses->clnt = p9_client_create(trans, v9ses->maxdata+P9_IOHDRSZ,
2405669b	269	v9fs_extended(v9ses));
9e82cf6a	270
bd238fb4 LI	271	if (IS_ERR(v9ses->clnt)) {
	272	retval = PTR_ERR(v9ses->clnt);
	273	v9ses->clnt = NULL;
	274	P9_DPRINTK(P9_DEBUG_ERROR, "problem initializing 9p client\n");
	275	goto error;
9e82cf6a EVH	276	}
9e82cf6a EVH	277
ba17674f LI	278	if (!v9ses->clnt->dotu)
	279	v9ses->flags &= ~V9FS_EXTENDED;
	280
	281	/* for legacy mode, fall back to V9FS_ACCESS_ANY */
	282	if (!v9fs_extended(v9ses) &&
	283	((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) {
	284
	285	v9ses->flags &= ~V9FS_ACCESS_MASK;
	286	v9ses->flags \|= V9FS_ACCESS_ANY;
	287	v9ses->uid = ~0;
	288	}
	289
	290	fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, ~0,
	291	v9ses->aname);
bd238fb4 LI	292	if (IS_ERR(fid)) {
	293	retval = PTR_ERR(fid);
	294	fid = NULL;
	295	P9_DPRINTK(P9_DEBUG_ERROR, "cannot attach\n");
	296	goto error;
9e82cf6a EVH	297	}
9e82cf6a EVH	298
ba17674f LI	299	if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE)
	300	fid->uid = v9ses->uid;
	301	else
	302	fid->uid = ~0;
	303
bd238fb4	304	return fid;
9e82cf6a	305
bd238fb4	306	error:
9e82cf6a	307	v9fs_session_close(v9ses);
bd238fb4	308	return ERR_PTR(retval);
9e82cf6a EVH	309	}
	310
	311	/**
	312	* v9fs_session_close - shutdown a session
	313	* @v9ses: session information structure
	314	*
	315	*/
	316
	317	void v9fs_session_close(struct v9fs_session_info *v9ses)
	318	{
bd238fb4 LI	319	if (v9ses->clnt) {
	320	p9_client_destroy(v9ses->clnt);
	321	v9ses->clnt = NULL;
3cf6429a	322	}
9e82cf6a	323
ba17674f LI	324	__putname(v9ses->uname);
ba17674f LI	325	__putname(v9ses->aname);
a80d923e	326	kfree(v9ses->options);
9e82cf6a EVH	327	}
9e82cf6a EVH	328
322b329a EVH	329	/**
	330	* v9fs_session_cancel - mark transport as disconnected
	331	* and cancel all pending requests.
	332	*/
	333	void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
bd238fb4 LI	334	P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
bd238fb4 LI	335	p9_client_disconnect(v9ses->clnt);
322b329a EVH	336	}
322b329a EVH	337
9e82cf6a EVH	338	extern int v9fs_error_init(void);
	339
	340	/**
	341	* v9fs_init - Initialize module
	342	*
	343	*/
	344
	345	static int __init init_v9fs(void)
	346	{
f94b3470	347	printk(KERN_INFO "Installing v9fs 9p2000 file system support\n");
a80d923e	348	/* TODO: Setup list of registered trasnport modules */
bd238fb4	349	return register_filesystem(&v9fs_fs_type);
9e82cf6a EVH	350	}
	351
	352	/**
	353	* v9fs_init - shutdown module
	354	*
	355	*/
	356
	357	static void __exit exit_v9fs(void)
	358	{
	359	unregister_filesystem(&v9fs_fs_type);
	360	}
	361
	362	module_init(init_v9fs)
	363	module_exit(exit_v9fs)
	364
bd238fb4	365	MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
9e82cf6a EVH	366	MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
	367	MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
	368	MODULE_LICENSE("GPL");