[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 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 "debug.h"
#include "v9fs.h"
#include "9p.h"
#include "v9fs_vfs.h"
#include "transport.h"
#include "mux.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_uname, Opt_remotename,
	/* Options that take no arguments */
	Opt_legacy, Opt_nodevmap, Opt_unix, Opt_tcp, Opt_fd,
	/* Cache options */
	Opt_cache_loose,
	/* 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=%x"},
	{Opt_uname, "uname=%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_cache_loose, "cache=loose"},
	{Opt_cache_loose, "loose"},
	{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;
	v9ses->cache = 0;

	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) {
				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_uname:
			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;
		case Opt_cache_loose:
			v9ses->cache = CACHE_LOOSE;
			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;
	}

	/* no need to store exactly p, we just need something non-null */
	error = idr_get_new(&p->pool, p, &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_check_idpool - check if the specified id is available
 * @id - id to check
 * @p - pool
 */
int v9fs_check_idpool(int id, struct v9fs_idpool *p)
{
	return idr_find(&p->pool, id) != NULL;
}

/**
 * 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;
	struct v9fs_str *version;

	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 tags */
	idr_init(&v9ses->fidpool.pool);
	init_MUTEX(&v9ses->fidpool.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;
		break;
	default:
		printk(KERN_ERR "v9fs: Bad mount protocol %d\n", v9ses->proto);
		retval = -ENOPROTOOPT;
		goto SessCleanUp;
	};

	v9ses->transport = kmalloc(sizeof(*v9ses->transport), GFP_KERNEL);
	if (!v9ses->transport) {
		retval = -ENOMEM;
		goto SessCleanUp;
	}

	memmove(v9ses->transport, trans_proto, sizeof(*v9ses->transport));

	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;

	v9ses->mux = v9fs_mux_init(v9ses->transport, v9ses->maxdata + V9FS_IOHDRSZ,
		&v9ses->extended);

	if (IS_ERR(v9ses->mux)) {
		retval = PTR_ERR(v9ses->mux);
		v9ses->mux = NULL;
		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;
		}

		version = &fcall->params.rversion.version;
		if (version->len==8 && !memcmp(version->str, "9P2000.u", 8)) {
			dprintk(DEBUG_9P, "9P2000 UNIX extensions enabled\n");
			v9ses->extended = 1;
		} else if (version->len==6 && !memcmp(version->str, "9P2000", 6)) {
			dprintk(DEBUG_9P, "9P2000 legacy mode enabled\n");
			v9ses->extended = 0;
		} else {
			retval = -EREMOTEIO;
			goto FreeFcall;
		}

		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) {
		dprintk(DEBUG_ERROR, "afid not equal to ~0\n");
		if (v9fs_t_clunk(v9ses, v9ses->afid))
			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->mux) {
		v9fs_mux_destroy(v9ses->mux);
		v9ses->mux = NULL;
	}

	if (v9ses->transport) {
		v9ses->transport->close(v9ses->transport);
		kfree(v9ses->transport);
		v9ses->transport = NULL;
	}

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

/**
 * v9fs_session_cancel - mark transport as disconnected
 * 	and cancel all pending requests.
 */
void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
	dprintk(DEBUG_ERROR, "cancel session %p\n", v9ses);
	v9ses->transport->status = Disconnected;
	v9fs_mux_cancel(v9ses->mux, -EIO);
}

extern int v9fs_error_init(void);

/**
 * v9fs_init - Initialize module
 *
 */

static int __init init_v9fs(void)
{
	int ret;

	v9fs_error_init();

	printk(KERN_INFO "Installing v9fs 9p2000 file system support\n");

	ret = v9fs_mux_global_init();
	if (ret) {
		printk(KERN_WARNING "v9fs: starting mux failed\n");
		return ret;
	}
	ret = register_filesystem(&v9fs_fs_type);
	if (ret) {
		printk(KERN_WARNING "v9fs: registering file system failed\n");
		v9fs_mux_global_exit();
	}

	return ret;
}

/**
 * v9fs_init - shutdown module
 *
 */

static void __exit exit_v9fs(void)
{
	v9fs_mux_global_exit();
	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
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>
	31	#include <linux/idr.h>
	32
	33	#include "debug.h"
	34	#include "v9fs.h"
	35	#include "9p.h"
	36	#include "v9fs_vfs.h"
	37	#include "transport.h"
	38	#include "mux.h"
9e82cf6a EVH	39
	40	/* TODO: sysfs or debugfs interface */
	41	int v9fs_debug_level = 0; /* feature-rific global debug level */
	42
	43	/*
	44	* Option Parsing (code inspired by NFS code)
	45	*
	46	*/
	47
	48	enum {
	49	/* Options that take integer arguments */
	50	Opt_port, Opt_msize, Opt_uid, Opt_gid, Opt_afid, Opt_debug,
	51	Opt_rfdno, Opt_wfdno,
	52	/* String options */
67543e50	53	Opt_uname, Opt_remotename,
9e82cf6a EVH	54	/* Options that take no arguments */
9e82cf6a EVH	55	Opt_legacy, Opt_nodevmap, Opt_unix, Opt_tcp, Opt_fd,
e03abc0c EVH	56	/* Cache options */
e03abc0c EVH	57	Opt_cache_loose,
9e82cf6a EVH	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"},
e1c92117	70	{Opt_debug, "debug=%x"},
67543e50	71	{Opt_uname, "uname=%s"},
9e82cf6a EVH	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"},
e03abc0c EVH	81	{Opt_cache_loose, "cache=loose"},
e03abc0c EVH	82	{Opt_cache_loose, "loose"},
9e82cf6a EVH	83	{Opt_err, NULL}
	84	};
	85
	86	/*
	87	* Parse option string.
	88	*/
	89
	90	/**
	91	* v9fs_parse_options - parse mount options into session structure
	92	* @options: options string passed from mount
	93	* @v9ses: existing v9fs session information
	94	*
	95	*/
	96
	97	static void v9fs_parse_options(char options, struct v9fs_session_info v9ses)
	98	{
	99	char *p;
	100	substring_t args[MAX_OPT_ARGS];
	101	int option;
	102	int ret;
	103
	104	/* setup defaults */
	105	v9ses->port = V9FS_PORT;
	106	v9ses->maxdata = 9000;
	107	v9ses->proto = PROTO_TCP;
	108	v9ses->extended = 1;
	109	v9ses->afid = ~0;
	110	v9ses->debug = 0;
	111	v9ses->rfdno = ~0;
	112	v9ses->wfdno = ~0;
e03abc0c	113	v9ses->cache = 0;
9e82cf6a EVH	114
	115	if (!options)
	116	return;
	117
	118	while ((p = strsep(&options, ",")) != NULL) {
	119	int token;
	120	if (!*p)
	121	continue;
	122	token = match_token(p, tokens, args);
67543e50	123	if (token < Opt_uname) {
9e82cf6a EVH	124	if ((ret = match_int(&args[0], &option)) < 0) {
	125	dprintk(DEBUG_ERROR,
	126	"integer field, but no integer?\n");
	127	continue;
	128	}
9e82cf6a EVH	129	}
	130	switch (token) {
	131	case Opt_port:
	132	v9ses->port = option;
	133	break;
	134	case Opt_msize:
	135	v9ses->maxdata = option;
	136	break;
	137	case Opt_uid:
	138	v9ses->uid = option;
	139	break;
	140	case Opt_gid:
	141	v9ses->gid = option;
	142	break;
	143	case Opt_afid:
	144	v9ses->afid = option;
	145	break;
	146	case Opt_rfdno:
	147	v9ses->rfdno = option;
	148	break;
	149	case Opt_wfdno:
	150	v9ses->wfdno = option;
	151	break;
	152	case Opt_debug:
	153	v9ses->debug = option;
	154	break;
	155	case Opt_tcp:
	156	v9ses->proto = PROTO_TCP;
	157	break;
	158	case Opt_unix:
	159	v9ses->proto = PROTO_UNIX;
	160	break;
	161	case Opt_fd:
	162	v9ses->proto = PROTO_FD;
	163	break;
67543e50	164	case Opt_uname:
9e82cf6a EVH	165	match_strcpy(v9ses->name, &args[0]);
	166	break;
	167	case Opt_remotename:
	168	match_strcpy(v9ses->remotename, &args[0]);
	169	break;
	170	case Opt_legacy:
	171	v9ses->extended = 0;
	172	break;
	173	case Opt_nodevmap:
	174	v9ses->nodev = 1;
	175	break;
e03abc0c EVH	176	case Opt_cache_loose:
	177	v9ses->cache = CACHE_LOOSE;
	178	break;
9e82cf6a EVH	179	default:
	180	continue;
	181	}
	182	}
	183	}
	184
	185	/**
	186	* v9fs_inode2v9ses - safely extract v9fs session info from super block
	187	* @inode: inode to extract information from
	188	*
	189	* Paranoid function to extract v9ses information from superblock,
	190	* if anything is missing it will report an error.
	191	*
	192	*/
	193
	194	struct v9fs_session_info v9fs_inode2v9ses(struct inode inode)
	195	{
	196	return (inode->i_sb->s_fs_info);
	197	}
	198
	199	/**
	200	* v9fs_get_idpool - allocate numeric id from pool
	201	* @p - pool to allocate from
	202	*
	203	* XXX - This seems to be an awful generic function, should it be in idr.c with
	204	* the lock included in struct idr?
	205	*/
	206
	207	int v9fs_get_idpool(struct v9fs_idpool *p)
	208	{
	209	int i = 0;
	210	int error;
	211
	212	retry:
	213	if (idr_pre_get(&p->pool, GFP_KERNEL) == 0)
	214	return 0;
	215
	216	if (down_interruptible(&p->lock) == -EINTR) {
	217	eprintk(KERN_WARNING, "Interrupted while locking\n");
	218	return -1;
	219	}
	220
3cf6429a LI	221	/* no need to store exactly p, we just need something non-null */
3cf6429a LI	222	error = idr_get_new(&p->pool, p, &i);
9e82cf6a EVH	223	up(&p->lock);
	224
	225	if (error == -EAGAIN)
	226	goto retry;
	227	else if (error)
	228	return -1;
	229
	230	return i;
	231	}
	232
	233	/**
	234	* v9fs_put_idpool - release numeric id from pool
	235	* @p - pool to allocate from
	236	*
	237	* XXX - This seems to be an awful generic function, should it be in idr.c with
	238	* the lock included in struct idr?
	239	*/
	240
	241	void v9fs_put_idpool(int id, struct v9fs_idpool *p)
	242	{
	243	if (down_interruptible(&p->lock) == -EINTR) {
	244	eprintk(KERN_WARNING, "Interrupted while locking\n");
	245	return;
	246	}
	247	idr_remove(&p->pool, id);
	248	up(&p->lock);
	249	}
	250
3cf6429a LI	251	/**
	252	* v9fs_check_idpool - check if the specified id is available
	253	* @id - id to check
	254	* @p - pool
	255	*/
	256	int v9fs_check_idpool(int id, struct v9fs_idpool *p)
	257	{
	258	return idr_find(&p->pool, id) != NULL;
	259	}
	260
9e82cf6a EVH	261	/**
	262	* v9fs_session_init - initialize session
	263	* @v9ses: session information structure
	264	* @dev_name: device being mounted
	265	* @data: options
	266	*
	267	*/
	268
	269	int
	270	v9fs_session_init(struct v9fs_session_info *v9ses,
	271	const char dev_name, char data)
	272	{
	273	struct v9fs_fcall *fcall = NULL;
	274	struct v9fs_transport *trans_proto;
	275	int n = 0;
	276	int newfid = -1;
	277	int retval = -EINVAL;
1dac06b2	278	struct v9fs_str *version;
9e82cf6a EVH	279
	280	v9ses->name = __getname();
	281	if (!v9ses->name)
	282	return -ENOMEM;
	283
	284	v9ses->remotename = __getname();
	285	if (!v9ses->remotename) {
ce44eeb6	286	__putname(v9ses->name);
9e82cf6a EVH	287	return -ENOMEM;
	288	}
	289
	290	strcpy(v9ses->name, V9FS_DEFUSER);
	291	strcpy(v9ses->remotename, V9FS_DEFANAME);
	292
	293	v9fs_parse_options(data, v9ses);
	294
	295	/* set global debug level */
	296	v9fs_debug_level = v9ses->debug;
	297
4a26c242	298	/* id pools that are session-dependent: fids and tags */
9e82cf6a EVH	299	idr_init(&v9ses->fidpool.pool);
9e82cf6a EVH	300	init_MUTEX(&v9ses->fidpool.lock);
9e82cf6a EVH	301
	302	switch (v9ses->proto) {
	303	case PROTO_TCP:
	304	trans_proto = &v9fs_trans_tcp;
	305	break;
	306	case PROTO_UNIX:
	307	trans_proto = &v9fs_trans_unix;
	308	*v9ses->remotename = 0;
	309	break;
	310	case PROTO_FD:
	311	trans_proto = &v9fs_trans_fd;
	312	*v9ses->remotename = 0;
9e82cf6a EVH	313	break;
	314	default:
	315	printk(KERN_ERR "v9fs: Bad mount protocol %d\n", v9ses->proto);
	316	retval = -ENOPROTOOPT;
	317	goto SessCleanUp;
	318	};
	319
a8e63bff LI	320	v9ses->transport = kmalloc(sizeof(*v9ses->transport), GFP_KERNEL);
	321	if (!v9ses->transport) {
	322	retval = -ENOMEM;
	323	goto SessCleanUp;
	324	}
	325
	326	memmove(v9ses->transport, trans_proto, sizeof(*v9ses->transport));
9e82cf6a EVH	327
	328	if ((retval = v9ses->transport->init(v9ses, dev_name, data)) < 0) {
	329	eprintk(KERN_ERR, "problem initializing transport\n");
	330	goto SessCleanUp;
	331	}
	332
	333	v9ses->inprogress = 0;
	334	v9ses->shutdown = 0;
	335	v9ses->session_hung = 0;
	336
3cf6429a LI	337	v9ses->mux = v9fs_mux_init(v9ses->transport, v9ses->maxdata + V9FS_IOHDRSZ,
	338	&v9ses->extended);
	339
	340	if (IS_ERR(v9ses->mux)) {
	341	retval = PTR_ERR(v9ses->mux);
	342	v9ses->mux = NULL;
9e82cf6a EVH	343	dprintk(DEBUG_ERROR, "problem initializing mux\n");
	344	goto SessCleanUp;
	345	}
	346
	347	if (v9ses->afid == ~0) {
	348	if (v9ses->extended)
	349	retval =
	350	v9fs_t_version(v9ses, v9ses->maxdata, "9P2000.u",
	351	&fcall);
	352	else
	353	retval = v9fs_t_version(v9ses, v9ses->maxdata, "9P2000",
	354	&fcall);
	355
	356	if (retval < 0) {
	357	dprintk(DEBUG_ERROR, "v9fs_t_version failed\n");
	358	goto FreeFcall;
	359	}
	360
1dac06b2 LI	361	version = &fcall->params.rversion.version;
1dac06b2 LI	362	if (version->len==8 && !memcmp(version->str, "9P2000.u", 8)) {
9e82cf6a EVH	363	dprintk(DEBUG_9P, "9P2000 UNIX extensions enabled\n");
9e82cf6a EVH	364	v9ses->extended = 1;
1dac06b2	365	} else if (version->len==6 && !memcmp(version->str, "9P2000", 6)) {
9e82cf6a EVH	366	dprintk(DEBUG_9P, "9P2000 legacy mode enabled\n");
9e82cf6a EVH	367	v9ses->extended = 0;
1dac06b2 LI	368	} else {
	369	retval = -EREMOTEIO;
	370	goto FreeFcall;
9e82cf6a EVH	371	}
	372
	373	n = fcall->params.rversion.msize;
	374	kfree(fcall);
	375
	376	if (n < v9ses->maxdata)
	377	v9ses->maxdata = n;
	378	}
	379
	380	newfid = v9fs_get_idpool(&v9ses->fidpool);
	381	if (newfid < 0) {
	382	eprintk(KERN_WARNING, "couldn't allocate FID\n");
	383	retval = -ENOMEM;
	384	goto SessCleanUp;
	385	}
	386	/* it is a little bit ugly, but we have to prevent newfid */
	387	/* being the same as afid, so if it is, get a new fid */
	388	if (v9ses->afid != ~0 && newfid == v9ses->afid) {
	389	newfid = v9fs_get_idpool(&v9ses->fidpool);
	390	if (newfid < 0) {
	391	eprintk(KERN_WARNING, "couldn't allocate FID\n");
	392	retval = -ENOMEM;
	393	goto SessCleanUp;
	394	}
	395	}
	396
	397	if ((retval =
	398	v9fs_t_attach(v9ses, v9ses->name, v9ses->remotename, newfid,
	399	v9ses->afid, NULL))
	400	< 0) {
	401	dprintk(DEBUG_ERROR, "cannot attach\n");
	402	goto SessCleanUp;
	403	}
	404
	405	if (v9ses->afid != ~0) {
46f6dac2	406	dprintk(DEBUG_ERROR, "afid not equal to ~0\n");
3cf6429a	407	if (v9fs_t_clunk(v9ses, v9ses->afid))
9e82cf6a EVH	408	dprintk(DEBUG_ERROR, "clunk failed\n");
	409	}
	410
	411	return newfid;
	412
	413	FreeFcall:
	414	kfree(fcall);
	415
	416	SessCleanUp:
	417	v9fs_session_close(v9ses);
	418	return retval;
	419	}
	420
	421	/**
	422	* v9fs_session_close - shutdown a session
	423	* @v9ses: session information structure
	424	*
	425	*/
	426
	427	void v9fs_session_close(struct v9fs_session_info *v9ses)
	428	{
3cf6429a LI	429	if (v9ses->mux) {
	430	v9fs_mux_destroy(v9ses->mux);
	431	v9ses->mux = NULL;
9e82cf6a EVH	432	}
9e82cf6a EVH	433
3cf6429a	434	if (v9ses->transport) {
9e82cf6a	435	v9ses->transport->close(v9ses->transport);
3cf6429a LI	436	kfree(v9ses->transport);
	437	v9ses->transport = NULL;
	438	}
9e82cf6a	439
ce44eeb6 DA	440	__putname(v9ses->name);
ce44eeb6 DA	441	__putname(v9ses->remotename);
9e82cf6a EVH	442	}
9e82cf6a EVH	443
322b329a EVH	444	/**
	445	* v9fs_session_cancel - mark transport as disconnected
	446	* and cancel all pending requests.
	447	*/
	448	void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
3cf6429a	449	dprintk(DEBUG_ERROR, "cancel session %p\n", v9ses);
322b329a	450	v9ses->transport->status = Disconnected;
3cf6429a	451	v9fs_mux_cancel(v9ses->mux, -EIO);
322b329a EVH	452	}
322b329a EVH	453
9e82cf6a EVH	454	extern int v9fs_error_init(void);
	455
	456	/**
	457	* v9fs_init - Initialize module
	458	*
	459	*/
	460
	461	static int __init init_v9fs(void)
	462	{
1dac06b2 LI	463	int ret;
1dac06b2 LI	464
9e82cf6a EVH	465	v9fs_error_init();
9e82cf6a EVH	466
f94b3470	467	printk(KERN_INFO "Installing v9fs 9p2000 file system support\n");
9e82cf6a	468
1dac06b2	469	ret = v9fs_mux_global_init();
f94b3470 EVH	470	if (ret) {
f94b3470 EVH	471	printk(KERN_WARNING "v9fs: starting mux failed\n");
d826380b	472	return ret;
f94b3470	473	}
d826380b	474	ret = register_filesystem(&v9fs_fs_type);
f94b3470 EVH	475	if (ret) {
f94b3470 EVH	476	printk(KERN_WARNING "v9fs: registering file system failed\n");
d826380b	477	v9fs_mux_global_exit();
f94b3470 EVH	478	}
f94b3470 EVH	479
1dac06b2	480	return ret;
9e82cf6a EVH	481	}
	482
	483	/**
	484	* v9fs_init - shutdown module
	485	*
	486	*/
	487
	488	static void __exit exit_v9fs(void)
	489	{
3cf6429a	490	v9fs_mux_global_exit();
9e82cf6a EVH	491	unregister_filesystem(&v9fs_fs_type);
	492	}
	493
	494	module_init(init_v9fs)
	495	module_exit(exit_v9fs)
	496
	497	MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
	498	MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
	499	MODULE_LICENSE("GPL");