[deliverable/linux.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 as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  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/config.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/parser.h>
#include <linux/idr.h>

#include "debug.h"
#include "v9fs.h"
#include "9p.h"
#include "v9fs_vfs.h"
#include "transport.h"
#include "mux.h"
#include "conv.h"

/* TODO: sysfs or debugfs interface */
int v9fs_debug_level = 0;	/* feature-rific global debug level  */

/*
  * Option Parsing (code inspired by NFS code)
  *
  */

enum {
	/* Options that take integer arguments */
	Opt_port, Opt_msize, Opt_uid, Opt_gid, Opt_afid, Opt_debug,
	Opt_rfdno, Opt_wfdno,
	/* String options */
	Opt_name, Opt_remotename,
	/* Options that take no arguments */
	Opt_legacy, Opt_nodevmap, Opt_unix, Opt_tcp, Opt_fd,
	/* Error token */
	Opt_err
};

static match_table_t tokens = {
	{Opt_port, "port=%u"},
	{Opt_msize, "msize=%u"},
	{Opt_uid, "uid=%u"},
	{Opt_gid, "gid=%u"},
	{Opt_afid, "afid=%u"},
	{Opt_rfdno, "rfdno=%u"},
	{Opt_wfdno, "wfdno=%u"},
	{Opt_debug, "debug=%u"},
	{Opt_name, "name=%s"},
	{Opt_remotename, "aname=%s"},
	{Opt_unix, "proto=unix"},
	{Opt_tcp, "proto=tcp"},
	{Opt_fd, "proto=fd"},
	{Opt_tcp, "tcp"},
	{Opt_unix, "unix"},
	{Opt_fd, "fd"},
	{Opt_legacy, "noextend"},
	{Opt_nodevmap, "nodevmap"},
	{Opt_err, NULL}
};

/*
 *  Parse option string.
 */

/**
 * 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(char *options, struct v9fs_session_info *v9ses)
{
	char *p;
	substring_t args[MAX_OPT_ARGS];
	int option;
	int ret;

	/* setup defaults */
	v9ses->port = V9FS_PORT;
	v9ses->maxdata = 9000;
	v9ses->proto = PROTO_TCP;
	v9ses->extended = 1;
	v9ses->afid = ~0;
	v9ses->debug = 0;
	v9ses->rfdno = ~0;
	v9ses->wfdno = ~0;

	if (!options)
		return;

	while ((p = strsep(&options, ",")) != NULL) {
		int token;
		if (!*p)
			continue;
		token = match_token(p, tokens, args);
		if (token < Opt_name) {
			if ((ret = match_int(&args[0], &option)) < 0) {
				dprintk(DEBUG_ERROR,
					"integer field, but no integer?\n");
				continue;
			}

		}
		switch (token) {
		case Opt_port:
			v9ses->port = option;
			break;
		case Opt_msize:
			v9ses->maxdata = option;
			break;
		case Opt_uid:
			v9ses->uid = option;
			break;
		case Opt_gid:
			v9ses->gid = option;
			break;
		case Opt_afid:
			v9ses->afid = option;
			break;
		case Opt_rfdno:
			v9ses->rfdno = option;
			break;
		case Opt_wfdno:
			v9ses->wfdno = option;
			break;
		case Opt_debug:
			v9ses->debug = option;
			break;
		case Opt_tcp:
			v9ses->proto = PROTO_TCP;
			break;
		case Opt_unix:
			v9ses->proto = PROTO_UNIX;
			break;
		case Opt_fd:
			v9ses->proto = PROTO_FD;
			break;
		case Opt_name:
			match_strcpy(v9ses->name, &args[0]);
			break;
		case Opt_remotename:
			match_strcpy(v9ses->remotename, &args[0]);
			break;
		case Opt_legacy:
			v9ses->extended = 0;
			break;
		case Opt_nodevmap:
			v9ses->nodev = 1;
			break;
		default:
			continue;
		}
	}
}

/**
 * v9fs_inode2v9ses - safely extract v9fs session info from super block
 * @inode: inode to extract information from
 *
 * Paranoid function to extract v9ses information from superblock,
 * if anything is missing it will report an error.
 *
 */

struct v9fs_session_info *v9fs_inode2v9ses(struct inode *inode)
{
	return (inode->i_sb->s_fs_info);
}

/**
 * v9fs_get_idpool - allocate numeric id from pool
 * @p - pool to allocate from
 *
 * XXX - This seems to be an awful generic function, should it be in idr.c with
 *            the lock included in struct idr?
 */

int v9fs_get_idpool(struct v9fs_idpool *p)
{
	int i = 0;
	int error;

retry:
	if (idr_pre_get(&p->pool, GFP_KERNEL) == 0)
		return 0;

	if (down_interruptible(&p->lock) == -EINTR) {
		eprintk(KERN_WARNING, "Interrupted while locking\n");
		return -1;
	}

	error = idr_get_new(&p->pool, NULL, &i);
	up(&p->lock);

	if (error == -EAGAIN)
		goto retry;
	else if (error)
		return -1;

	return i;
}

/**
 * v9fs_put_idpool - release numeric id from pool
 * @p - pool to allocate from
 *
 * XXX - This seems to be an awful generic function, should it be in idr.c with
 *            the lock included in struct idr?
 */

void v9fs_put_idpool(int id, struct v9fs_idpool *p)
{
	if (down_interruptible(&p->lock) == -EINTR) {
		eprintk(KERN_WARNING, "Interrupted while locking\n");
		return;
	}
	idr_remove(&p->pool, id);
	up(&p->lock);
}

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

int
v9fs_session_init(struct v9fs_session_info *v9ses,
		  const char *dev_name, char *data)
{
	struct v9fs_fcall *fcall = NULL;
	struct v9fs_transport *trans_proto;
	int n = 0;
	int newfid = -1;
	int retval = -EINVAL;

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

	v9ses->remotename = __getname();
	if (!v9ses->remotename) {
		putname(v9ses->name);
		return -ENOMEM;
	}

	strcpy(v9ses->name, V9FS_DEFUSER);
	strcpy(v9ses->remotename, V9FS_DEFANAME);

	v9fs_parse_options(data, v9ses);

	/* set global debug level */
	v9fs_debug_level = v9ses->debug;

	/* id pools that are session-dependent: FIDs and TIDs */
	idr_init(&v9ses->fidpool.pool);
	init_MUTEX(&v9ses->fidpool.lock);
	idr_init(&v9ses->tidpool.pool);
	init_MUTEX(&v9ses->tidpool.lock);


	switch (v9ses->proto) {
	case PROTO_TCP:
		trans_proto = &v9fs_trans_tcp;
		break;
	case PROTO_UNIX:
		trans_proto = &v9fs_trans_unix;
		*v9ses->remotename = 0;
		break;
	case PROTO_FD:
		trans_proto = &v9fs_trans_fd;
		*v9ses->remotename = 0;
		if((v9ses->wfdno == ~0) || (v9ses->rfdno == ~0)) {
			printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
			retval = -ENOPROTOOPT;
			goto SessCleanUp;
		}
		break;
	default:
		printk(KERN_ERR "v9fs: Bad mount protocol %d\n", v9ses->proto);
		retval = -ENOPROTOOPT;
		goto SessCleanUp;
	};

	v9ses->transport = trans_proto;

	if ((retval = v9ses->transport->init(v9ses, dev_name, data)) < 0) {
		eprintk(KERN_ERR, "problem initializing transport\n");
		goto SessCleanUp;
	}

	v9ses->inprogress = 0;
	v9ses->shutdown = 0;
	v9ses->session_hung = 0;

	if ((retval = v9fs_mux_init(v9ses, dev_name)) < 0) {
		dprintk(DEBUG_ERROR, "problem initializing mux\n");
		goto SessCleanUp;
	}

	if (v9ses->afid == ~0) {
		if (v9ses->extended)
			retval =
			    v9fs_t_version(v9ses, v9ses->maxdata, "9P2000.u",
					   &fcall);
		else
			retval = v9fs_t_version(v9ses, v9ses->maxdata, "9P2000",
						&fcall);

		if (retval < 0) {
			dprintk(DEBUG_ERROR, "v9fs_t_version failed\n");
			goto FreeFcall;
		}

		/* Really should check for 9P1 and report error */
		if (!strcmp(fcall->params.rversion.version, "9P2000.u")) {
			dprintk(DEBUG_9P, "9P2000 UNIX extensions enabled\n");
			v9ses->extended = 1;
		} else {
			dprintk(DEBUG_9P, "9P2000 legacy mode enabled\n");
			v9ses->extended = 0;
		}

		n = fcall->params.rversion.msize;
		kfree(fcall);

		if (n < v9ses->maxdata)
			v9ses->maxdata = n;
	}

	newfid = v9fs_get_idpool(&v9ses->fidpool);
	if (newfid < 0) {
		eprintk(KERN_WARNING, "couldn't allocate FID\n");
		retval = -ENOMEM;
		goto SessCleanUp;
	}
	/* it is a little bit ugly, but we have to prevent newfid */
	/* being the same as afid, so if it is, get a new fid     */
	if (v9ses->afid != ~0 && newfid == v9ses->afid) {
		newfid = v9fs_get_idpool(&v9ses->fidpool);
		if (newfid < 0) {
			eprintk(KERN_WARNING, "couldn't allocate FID\n");
			retval = -ENOMEM;
			goto SessCleanUp;
		}
	}

	if ((retval =
	     v9fs_t_attach(v9ses, v9ses->name, v9ses->remotename, newfid,
			   v9ses->afid, NULL))
	    < 0) {
		dprintk(DEBUG_ERROR, "cannot attach\n");
		goto SessCleanUp;
	}

	if (v9ses->afid != ~0) {
		if (v9fs_t_clunk(v9ses, v9ses->afid, NULL))
			dprintk(DEBUG_ERROR, "clunk failed\n");
	}

	return newfid;

      FreeFcall:
	kfree(fcall);

      SessCleanUp:
	v9fs_session_close(v9ses);
	return retval;
}

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

void v9fs_session_close(struct v9fs_session_info *v9ses)
{
	if (v9ses->recvproc) {
		send_sig(SIGKILL, v9ses->recvproc, 1);
		wait_for_completion(&v9ses->proccmpl);
	}

	if (v9ses->transport)
		v9ses->transport->close(v9ses->transport);

	putname(v9ses->name);
	putname(v9ses->remotename);
}

extern int v9fs_error_init(void);

/**
 * v9fs_init - Initialize module
 *
 */

static int __init init_v9fs(void)
{
	v9fs_error_init();

	printk(KERN_INFO "Installing v9fs 9P2000 file system support\n");

	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("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
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or
	12	* (at your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to:
	21	* Free Software Foundation
	22	* 51 Franklin Street, Fifth Floor
	23	* Boston, MA 02111-1301 USA
	24	*
	25	*/
	26
	27	#include <linux/config.h>
	28	#include <linux/module.h>
	29	#include <linux/errno.h>
	30	#include <linux/fs.h>
	31	#include <linux/parser.h>
	32	#include <linux/idr.h>
	33
	34	#include "debug.h"
	35	#include "v9fs.h"
	36	#include "9p.h"
	37	#include "v9fs_vfs.h"
	38	#include "transport.h"
	39	#include "mux.h"
	40	#include "conv.h"
	41
	42	/* TODO: sysfs or debugfs interface */
	43	int v9fs_debug_level = 0; /* feature-rific global debug level */
	44
	45	/*
	46	* Option Parsing (code inspired by NFS code)
	47	*
	48	*/
	49
	50	enum {
	51	/* Options that take integer arguments */
	52	Opt_port, Opt_msize, Opt_uid, Opt_gid, Opt_afid, Opt_debug,
	53	Opt_rfdno, Opt_wfdno,
	54	/* String options */
	55	Opt_name, Opt_remotename,
	56	/* Options that take no arguments */
	57	Opt_legacy, Opt_nodevmap, Opt_unix, Opt_tcp, Opt_fd,
	58	/* Error token */
	59	Opt_err
	60	};
	61
	62	static match_table_t tokens = {
	63	{Opt_port, "port=%u"},
	64	{Opt_msize, "msize=%u"},
65	{Opt_uid, "uid=%u"},
66	{Opt_gid, "gid=%u"},
67	{Opt_afid, "afid=%u"},
68	{Opt_rfdno, "rfdno=%u"},
69	{Opt_wfdno, "wfdno=%u"},
70	{Opt_debug, "debug=%u"},
71	{Opt_name, "name=%s"},
72	{Opt_remotename, "aname=%s"},
73	{Opt_unix, "proto=unix"},
74	{Opt_tcp, "proto=tcp"},
75	{Opt_fd, "proto=fd"},
76	{Opt_tcp, "tcp"},
77	{Opt_unix, "unix"},
78	{Opt_fd, "fd"},
79	{Opt_legacy, "noextend"},
80	{Opt_nodevmap, "nodevmap"},
81	{Opt_err, NULL}
82	};
83
84	/*
85	* Parse option string.
86	*/
87
88	/**
89	* v9fs_parse_options - parse mount options into session structure
90	* @options: options string passed from mount
91	* @v9ses: existing v9fs session information
92	*
93	*/
94
95	static void v9fs_parse_options(char options, struct v9fs_session_info v9ses)
96	{
97	char *p;
98	substring_t args[MAX_OPT_ARGS];
99	int option;
100	int ret;
101
102	/* setup defaults */
103	v9ses->port = V9FS_PORT;
104	v9ses->maxdata = 9000;
105	v9ses->proto = PROTO_TCP;
106	v9ses->extended = 1;
107	v9ses->afid = ~0;
108	v9ses->debug = 0;
109	v9ses->rfdno = ~0;
110	v9ses->wfdno = ~0;
111
112	if (!options)
113	return;
114
115	while ((p = strsep(&options, ",")) != NULL) {
116	int token;
117	if (!*p)
118	continue;
119	token = match_token(p, tokens, args);
120	if (token < Opt_name) {
121	if ((ret = match_int(&args[0], &option)) < 0) {
122	dprintk(DEBUG_ERROR,
123	"integer field, but no integer?\n");
124	continue;
125	}
126
127	}
128	switch (token) {
129	case Opt_port:
130	v9ses->port = option;
131	break;
132	case Opt_msize:
133	v9ses->maxdata = option;
134	break;
135	case Opt_uid:
136	v9ses->uid = option;
137	break;
138	case Opt_gid:
139	v9ses->gid = option;
140	break;
141	case Opt_afid:
142	v9ses->afid = option;
143	break;
144	case Opt_rfdno:
145	v9ses->rfdno = option;
146	break;
147	case Opt_wfdno:
148	v9ses->wfdno = option;
149	break;
150	case Opt_debug:
151	v9ses->debug = option;
152	break;
153	case Opt_tcp:
154	v9ses->proto = PROTO_TCP;
155	break;
156	case Opt_unix:
157	v9ses->proto = PROTO_UNIX;
158	break;
159	case Opt_fd:
160	v9ses->proto = PROTO_FD;
161	break;
162	case Opt_name:
163	match_strcpy(v9ses->name, &args[0]);
164	break;
165	case Opt_remotename:
166	match_strcpy(v9ses->remotename, &args[0]);
167	break;
168	case Opt_legacy:
169	v9ses->extended = 0;
170	break;
171	case Opt_nodevmap:
172	v9ses->nodev = 1;
173	break;
174	default:
175	continue;
176	}
177	}
178	}
179
180	/**
181	* v9fs_inode2v9ses - safely extract v9fs session info from super block
182	* @inode: inode to extract information from
183	*
184	* Paranoid function to extract v9ses information from superblock,
185	* if anything is missing it will report an error.
186	*
187	*/
188
189	struct v9fs_session_info v9fs_inode2v9ses(struct inode inode)
190	{
191	return (inode->i_sb->s_fs_info);
192	}
193
194	/**
195	* v9fs_get_idpool - allocate numeric id from pool
196	* @p - pool to allocate from
197	*
198	* XXX - This seems to be an awful generic function, should it be in idr.c with
199	* the lock included in struct idr?
200	*/
201
202	int v9fs_get_idpool(struct v9fs_idpool *p)
203	{
204	int i = 0;
205	int error;
206
207	retry:
208	if (idr_pre_get(&p->pool, GFP_KERNEL) == 0)
209	return 0;
210
211	if (down_interruptible(&p->lock) == -EINTR) {
212	eprintk(KERN_WARNING, "Interrupted while locking\n");
213	return -1;
214	}
215
216	error = idr_get_new(&p->pool, NULL, &i);
217	up(&p->lock);
218
219	if (error == -EAGAIN)
220	goto retry;
221	else if (error)
222	return -1;
223
224	return i;
225	}
226
227	/**
228	* v9fs_put_idpool - release numeric id from pool
229	* @p - pool to allocate from
230	*
231	* XXX - This seems to be an awful generic function, should it be in idr.c with
232	* the lock included in struct idr?
233	*/
234
235	void v9fs_put_idpool(int id, struct v9fs_idpool *p)
236	{
237	if (down_interruptible(&p->lock) == -EINTR) {
238	eprintk(KERN_WARNING, "Interrupted while locking\n");
239	return;
240	}
241	idr_remove(&p->pool, id);
242	up(&p->lock);
243	}
244
245	/**
246	* v9fs_session_init - initialize session
247	* @v9ses: session information structure
248	* @dev_name: device being mounted
249	* @data: options
250	*
251	*/
252
253	int
254	v9fs_session_init(struct v9fs_session_info *v9ses,
255	const char dev_name, char data)
256	{
257	struct v9fs_fcall *fcall = NULL;
258	struct v9fs_transport *trans_proto;
259	int n = 0;
260	int newfid = -1;
261	int retval = -EINVAL;
262
263	v9ses->name = __getname();
264	if (!v9ses->name)
265	return -ENOMEM;
266
267	v9ses->remotename = __getname();
268	if (!v9ses->remotename) {
269	putname(v9ses->name);
270	return -ENOMEM;
271	}
272
273	strcpy(v9ses->name, V9FS_DEFUSER);
274	strcpy(v9ses->remotename, V9FS_DEFANAME);
275
276	v9fs_parse_options(data, v9ses);
277
278	/* set global debug level */
279	v9fs_debug_level = v9ses->debug;
280
281	/* id pools that are session-dependent: FIDs and TIDs */
282	idr_init(&v9ses->fidpool.pool);
283	init_MUTEX(&v9ses->fidpool.lock);
284	idr_init(&v9ses->tidpool.pool);
285	init_MUTEX(&v9ses->tidpool.lock);
286
287
288	switch (v9ses->proto) {
289	case PROTO_TCP:
290	trans_proto = &v9fs_trans_tcp;
291	break;
292	case PROTO_UNIX:
293	trans_proto = &v9fs_trans_unix;
294	*v9ses->remotename = 0;
295	break;
296	case PROTO_FD:
297	trans_proto = &v9fs_trans_fd;
298	*v9ses->remotename = 0;
299	if((v9ses->wfdno == ~0) \|\| (v9ses->rfdno == ~0)) {
300	printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
301	retval = -ENOPROTOOPT;
302	goto SessCleanUp;
303	}
304	break;
305	default:
306	printk(KERN_ERR "v9fs: Bad mount protocol %d\n", v9ses->proto);
307	retval = -ENOPROTOOPT;
308	goto SessCleanUp;
309	};
310
311	v9ses->transport = trans_proto;
312
313	if ((retval = v9ses->transport->init(v9ses, dev_name, data)) < 0) {
314	eprintk(KERN_ERR, "problem initializing transport\n");
315	goto SessCleanUp;
316	}
317
318	v9ses->inprogress = 0;
319	v9ses->shutdown = 0;
320	v9ses->session_hung = 0;
321
322	if ((retval = v9fs_mux_init(v9ses, dev_name)) < 0) {
323	dprintk(DEBUG_ERROR, "problem initializing mux\n");
324	goto SessCleanUp;
325	}
326
327	if (v9ses->afid == ~0) {
328	if (v9ses->extended)
329	retval =
330	v9fs_t_version(v9ses, v9ses->maxdata, "9P2000.u",
331	&fcall);
332	else
333	retval = v9fs_t_version(v9ses, v9ses->maxdata, "9P2000",
334	&fcall);
335
336	if (retval < 0) {
337	dprintk(DEBUG_ERROR, "v9fs_t_version failed\n");
338	goto FreeFcall;
339	}
340
341	/* Really should check for 9P1 and report error */
342	if (!strcmp(fcall->params.rversion.version, "9P2000.u")) {
343	dprintk(DEBUG_9P, "9P2000 UNIX extensions enabled\n");
344	v9ses->extended = 1;
345	} else {
346	dprintk(DEBUG_9P, "9P2000 legacy mode enabled\n");
347	v9ses->extended = 0;
348	}
349
350	n = fcall->params.rversion.msize;
351	kfree(fcall);
352
353	if (n < v9ses->maxdata)
354	v9ses->maxdata = n;
355	}
356
357	newfid = v9fs_get_idpool(&v9ses->fidpool);
358	if (newfid < 0) {
359	eprintk(KERN_WARNING, "couldn't allocate FID\n");
360	retval = -ENOMEM;
361	goto SessCleanUp;
362	}
363	/* it is a little bit ugly, but we have to prevent newfid */
364	/* being the same as afid, so if it is, get a new fid */
365	if (v9ses->afid != ~0 && newfid == v9ses->afid) {
366	newfid = v9fs_get_idpool(&v9ses->fidpool);
367	if (newfid < 0) {
368	eprintk(KERN_WARNING, "couldn't allocate FID\n");
369	retval = -ENOMEM;
370	goto SessCleanUp;
371	}
372	}
373
374	if ((retval =
375	v9fs_t_attach(v9ses, v9ses->name, v9ses->remotename, newfid,
376	v9ses->afid, NULL))
377	< 0) {
378	dprintk(DEBUG_ERROR, "cannot attach\n");
379	goto SessCleanUp;
380	}
381
382	if (v9ses->afid != ~0) {
383	if (v9fs_t_clunk(v9ses, v9ses->afid, NULL))
384	dprintk(DEBUG_ERROR, "clunk failed\n");
385	}
386
387	return newfid;
388
389	FreeFcall:
390	kfree(fcall);
391
392	SessCleanUp:
393	v9fs_session_close(v9ses);
394	return retval;
395	}
396
397	/**
398	* v9fs_session_close - shutdown a session
399	* @v9ses: session information structure
400	*
401	*/
402
403	void v9fs_session_close(struct v9fs_session_info *v9ses)
404	{
405	if (v9ses->recvproc) {
406	send_sig(SIGKILL, v9ses->recvproc, 1);
407	wait_for_completion(&v9ses->proccmpl);
408	}
409
410	if (v9ses->transport)
411	v9ses->transport->close(v9ses->transport);
412
413	putname(v9ses->name);
414	putname(v9ses->remotename);
415	}
416
417	extern int v9fs_error_init(void);
418
419	/**
420	* v9fs_init - Initialize module
421	*
422	*/
423
424	static int __init init_v9fs(void)
425	{
426	v9fs_error_init();
427
428	printk(KERN_INFO "Installing v9fs 9P2000 file system support\n");
429
430	return register_filesystem(&v9fs_fs_type);
431	}
432
433	/**
434	* v9fs_init - shutdown module
435	*
436	*/
437
438	static void __exit exit_v9fs(void)
439	{
440	unregister_filesystem(&v9fs_fs_type);
441	}
442
443	module_init(init_v9fs)
444	module_exit(exit_v9fs)
445
446	MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
447	MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
448	MODULE_LICENSE("GPL");