[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 <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"

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

enum {
	/* Options that take integer arguments */
	Opt_debug, Opt_port, Opt_msize, Opt_uid, Opt_gid, Opt_afid,
	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, Opt_pci,
	/* Cache options */
	Opt_cache_loose,
	/* Error token */
	Opt_err
};

static match_table_t tokens = {
	{Opt_debug, "debug=%x"},
	{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_uname, "uname=%s"},
	{Opt_remotename, "aname=%s"},
	{Opt_unix, "proto=unix"},
	{Opt_tcp, "proto=tcp"},
	{Opt_fd, "proto=fd"},
#ifdef CONFIG_PCI_9P
	{Opt_pci, "proto=pci"},
#endif
	{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}
};

extern struct p9_transport *p9pci_trans_create(void);

/*
 *  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) {
				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_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_tcp:
			v9ses->proto = PROTO_TCP;
			break;
		case Opt_unix:
			v9ses->proto = PROTO_UNIX;
			break;
		case Opt_pci:
			v9ses->proto = PROTO_PCI;
			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_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_transport *trans;
	struct p9_fid *fid;

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

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

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

	v9fs_parse_options(data, v9ses);

	switch (v9ses->proto) {
	case PROTO_TCP:
		trans = p9_trans_create_tcp(dev_name, v9ses->port);
		break;
	case PROTO_UNIX:
		trans = p9_trans_create_unix(dev_name);
		*v9ses->remotename = 0;
		break;
	case PROTO_FD:
		trans = p9_trans_create_fd(v9ses->rfdno, v9ses->wfdno);
		*v9ses->remotename = 0;
		break;
#ifdef CONFIG_PCI_9P
	case PROTO_PCI:
		trans = p9pci_trans_create();
		*v9ses->remotename = 0;
		break;
#endif
	default:
		printk(KERN_ERR "v9fs: Bad mount protocol %d\n", v9ses->proto);
		retval = -ENOPROTOOPT;
		goto error;
	};

	if (IS_ERR(trans)) {
		retval = PTR_ERR(trans);
		trans = NULL;
		goto error;
	}

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

	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;
	}

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

	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->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) {
	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");

	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 EVH	38
	39	/*
	40	* Option Parsing (code inspired by NFS code)
	41	*
	42	*/
	43
	44	enum {
	45	/* Options that take integer arguments */
9e2f6688	46	Opt_debug, Opt_port, Opt_msize, Opt_uid, Opt_gid, Opt_afid,
9e82cf6a EVH	47	Opt_rfdno, Opt_wfdno,
9e82cf6a EVH	48	/* String options */
67543e50	49	Opt_uname, Opt_remotename,
9e82cf6a	50	/* Options that take no arguments */
bd238fb4	51	Opt_legacy, Opt_nodevmap, Opt_unix, Opt_tcp, Opt_fd, Opt_pci,
e03abc0c EVH	52	/* Cache options */
e03abc0c EVH	53	Opt_cache_loose,
9e82cf6a EVH	54	/* Error token */
	55	Opt_err
	56	};
	57
	58	static match_table_t tokens = {
9e2f6688	59	{Opt_debug, "debug=%x"},
9e82cf6a EVH	60	{Opt_port, "port=%u"},
	61	{Opt_msize, "msize=%u"},
	62	{Opt_uid, "uid=%u"},
	63	{Opt_gid, "gid=%u"},
	64	{Opt_afid, "afid=%u"},
	65	{Opt_rfdno, "rfdno=%u"},
	66	{Opt_wfdno, "wfdno=%u"},
67543e50	67	{Opt_uname, "uname=%s"},
9e82cf6a EVH	68	{Opt_remotename, "aname=%s"},
	69	{Opt_unix, "proto=unix"},
	70	{Opt_tcp, "proto=tcp"},
	71	{Opt_fd, "proto=fd"},
bd238fb4 LI	72	#ifdef CONFIG_PCI_9P
	73	{Opt_pci, "proto=pci"},
	74	#endif
9e82cf6a EVH	75	{Opt_tcp, "tcp"},
	76	{Opt_unix, "unix"},
	77	{Opt_fd, "fd"},
	78	{Opt_legacy, "noextend"},
	79	{Opt_nodevmap, "nodevmap"},
e03abc0c EVH	80	{Opt_cache_loose, "cache=loose"},
e03abc0c EVH	81	{Opt_cache_loose, "loose"},
9e82cf6a EVH	82	{Opt_err, NULL}
	83	};
	84
bd238fb4 LI	85	extern struct p9_transport *p9pci_trans_create(void);
bd238fb4 LI	86
9e82cf6a EVH	87	/*
	88	* Parse option string.
	89	*/
	90
	91	/**
	92	* v9fs_parse_options - parse mount options into session structure
	93	* @options: options string passed from mount
	94	* @v9ses: existing v9fs session information
	95	*
	96	*/
	97
	98	static void v9fs_parse_options(char options, struct v9fs_session_info v9ses)
	99	{
	100	char *p;
	101	substring_t args[MAX_OPT_ARGS];
	102	int option;
	103	int ret;
	104
	105	/* setup defaults */
	106	v9ses->port = V9FS_PORT;
	107	v9ses->maxdata = 9000;
	108	v9ses->proto = PROTO_TCP;
	109	v9ses->extended = 1;
	110	v9ses->afid = ~0;
	111	v9ses->debug = 0;
	112	v9ses->rfdno = ~0;
	113	v9ses->wfdno = ~0;
e03abc0c	114	v9ses->cache = 0;
9e82cf6a EVH	115
	116	if (!options)
	117	return;
	118
	119	while ((p = strsep(&options, ",")) != NULL) {
	120	int token;
	121	if (!*p)
	122	continue;
	123	token = match_token(p, tokens, args);
67543e50	124	if (token < Opt_uname) {
9e82cf6a	125	if ((ret = match_int(&args[0], &option)) < 0) {
bd238fb4	126	P9_DPRINTK(P9_DEBUG_ERROR,
9e82cf6a EVH	127	"integer field, but no integer?\n");
	128	continue;
	129	}
9e82cf6a EVH	130	}
9e82cf6a EVH	131	switch (token) {
9e2f6688 EVH	132	case Opt_debug:
9e2f6688 EVH	133	v9ses->debug = option;
10fa16e7	134	#ifdef CONFIG_NET_9P_DEBUG
9e2f6688	135	p9_debug_level = option;
10fa16e7	136	#endif
9e2f6688	137	break;
9e82cf6a EVH	138	case Opt_port:
	139	v9ses->port = option;
	140	break;
	141	case Opt_msize:
	142	v9ses->maxdata = option;
	143	break;
	144	case Opt_uid:
	145	v9ses->uid = option;
	146	break;
	147	case Opt_gid:
	148	v9ses->gid = option;
	149	break;
	150	case Opt_afid:
	151	v9ses->afid = option;
	152	break;
	153	case Opt_rfdno:
	154	v9ses->rfdno = option;
	155	break;
	156	case Opt_wfdno:
	157	v9ses->wfdno = option;
	158	break;
9e82cf6a EVH	159	case Opt_tcp:
	160	v9ses->proto = PROTO_TCP;
	161	break;
	162	case Opt_unix:
	163	v9ses->proto = PROTO_UNIX;
	164	break;
bd238fb4 LI	165	case Opt_pci:
	166	v9ses->proto = PROTO_PCI;
	167	break;
9e82cf6a EVH	168	case Opt_fd:
	169	v9ses->proto = PROTO_FD;
	170	break;
67543e50	171	case Opt_uname:
9e82cf6a EVH	172	match_strcpy(v9ses->name, &args[0]);
	173	break;
	174	case Opt_remotename:
	175	match_strcpy(v9ses->remotename, &args[0]);
	176	break;
	177	case Opt_legacy:
	178	v9ses->extended = 0;
	179	break;
	180	case Opt_nodevmap:
	181	v9ses->nodev = 1;
	182	break;
e03abc0c EVH	183	case Opt_cache_loose:
	184	v9ses->cache = CACHE_LOOSE;
	185	break;
9e82cf6a EVH	186	default:
	187	continue;
	188	}
	189	}
	190	}
	191
9e82cf6a EVH	192	/**
	193	* v9fs_session_init - initialize session
	194	* @v9ses: session information structure
	195	* @dev_name: device being mounted
	196	* @data: options
	197	*
	198	*/
	199
bd238fb4	200	struct p9_fid v9fs_session_init(struct v9fs_session_info v9ses,
9e82cf6a EVH	201	const char dev_name, char data)
9e82cf6a EVH	202	{
9e82cf6a	203	int retval = -EINVAL;
bd238fb4 LI	204	struct p9_transport *trans;
bd238fb4 LI	205	struct p9_fid *fid;
9e82cf6a EVH	206
	207	v9ses->name = __getname();
	208	if (!v9ses->name)
bd238fb4	209	return ERR_PTR(-ENOMEM);
9e82cf6a EVH	210
	211	v9ses->remotename = __getname();
	212	if (!v9ses->remotename) {
ce44eeb6	213	__putname(v9ses->name);
bd238fb4	214	return ERR_PTR(-ENOMEM);
9e82cf6a EVH	215	}
	216
	217	strcpy(v9ses->name, V9FS_DEFUSER);
	218	strcpy(v9ses->remotename, V9FS_DEFANAME);
	219
	220	v9fs_parse_options(data, v9ses);
	221
9e82cf6a EVH	222	switch (v9ses->proto) {
9e82cf6a EVH	223	case PROTO_TCP:
bd238fb4	224	trans = p9_trans_create_tcp(dev_name, v9ses->port);
9e82cf6a EVH	225	break;
9e82cf6a EVH	226	case PROTO_UNIX:
bd238fb4	227	trans = p9_trans_create_unix(dev_name);
9e82cf6a EVH	228	*v9ses->remotename = 0;
	229	break;
	230	case PROTO_FD:
bd238fb4 LI	231	trans = p9_trans_create_fd(v9ses->rfdno, v9ses->wfdno);
	232	*v9ses->remotename = 0;
	233	break;
	234	#ifdef CONFIG_PCI_9P
	235	case PROTO_PCI:
	236	trans = p9pci_trans_create();
9e82cf6a	237	*v9ses->remotename = 0;
9e82cf6a	238	break;
bd238fb4	239	#endif
9e82cf6a EVH	240	default:
	241	printk(KERN_ERR "v9fs: Bad mount protocol %d\n", v9ses->proto);
	242	retval = -ENOPROTOOPT;
bd238fb4	243	goto error;
9e82cf6a EVH	244	};
9e82cf6a EVH	245
bd238fb4 LI	246	if (IS_ERR(trans)) {
	247	retval = PTR_ERR(trans);
	248	trans = NULL;
	249	goto error;
a8e63bff LI	250	}
a8e63bff LI	251
bd238fb4 LI	252	v9ses->clnt = p9_client_create(trans, v9ses->maxdata + P9_IOHDRSZ,
bd238fb4 LI	253	v9ses->extended);
9e82cf6a	254
bd238fb4 LI	255	if (IS_ERR(v9ses->clnt)) {
	256	retval = PTR_ERR(v9ses->clnt);
	257	v9ses->clnt = NULL;
	258	P9_DPRINTK(P9_DEBUG_ERROR, "problem initializing 9p client\n");
	259	goto error;
9e82cf6a EVH	260	}
9e82cf6a EVH	261
bd238fb4 LI	262	fid = p9_client_attach(v9ses->clnt, NULL, v9ses->name,
	263	v9ses->remotename);
	264	if (IS_ERR(fid)) {
	265	retval = PTR_ERR(fid);
	266	fid = NULL;
	267	P9_DPRINTK(P9_DEBUG_ERROR, "cannot attach\n");
	268	goto error;
9e82cf6a EVH	269	}
9e82cf6a EVH	270
bd238fb4	271	return fid;
9e82cf6a	272
bd238fb4	273	error:
9e82cf6a	274	v9fs_session_close(v9ses);
bd238fb4	275	return ERR_PTR(retval);
9e82cf6a EVH	276	}
	277
	278	/**
	279	* v9fs_session_close - shutdown a session
	280	* @v9ses: session information structure
	281	*
	282	*/
	283
	284	void v9fs_session_close(struct v9fs_session_info *v9ses)
	285	{
bd238fb4 LI	286	if (v9ses->clnt) {
	287	p9_client_destroy(v9ses->clnt);
	288	v9ses->clnt = NULL;
3cf6429a	289	}
9e82cf6a	290
ce44eeb6 DA	291	__putname(v9ses->name);
ce44eeb6 DA	292	__putname(v9ses->remotename);
9e82cf6a EVH	293	}
9e82cf6a EVH	294
322b329a EVH	295	/**
	296	* v9fs_session_cancel - mark transport as disconnected
	297	* and cancel all pending requests.
	298	*/
	299	void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
bd238fb4 LI	300	P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
bd238fb4 LI	301	p9_client_disconnect(v9ses->clnt);
322b329a EVH	302	}
322b329a EVH	303
9e82cf6a EVH	304	extern int v9fs_error_init(void);
	305
	306	/**
	307	* v9fs_init - Initialize module
	308	*
	309	*/
	310
	311	static int __init init_v9fs(void)
	312	{
f94b3470	313	printk(KERN_INFO "Installing v9fs 9p2000 file system support\n");
9e82cf6a	314
bd238fb4	315	return register_filesystem(&v9fs_fs_type);
9e82cf6a EVH	316	}
	317
	318	/**
	319	* v9fs_init - shutdown module
	320	*
	321	*/
	322
	323	static void __exit exit_v9fs(void)
	324	{
	325	unregister_filesystem(&v9fs_fs_type);
	326	}
	327
	328	module_init(init_v9fs)
	329	module_exit(exit_v9fs)
	330
bd238fb4	331	MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
9e82cf6a EVH	332	MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
	333	MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
	334	MODULE_LICENSE("GPL");