[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_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_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_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 */
bd238fb4	46	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 = {
	59	{Opt_port, "port=%u"},
	60	{Opt_msize, "msize=%u"},
	61	{Opt_uid, "uid=%u"},
	62	{Opt_gid, "gid=%u"},
	63	{Opt_afid, "afid=%u"},
	64	{Opt_rfdno, "rfdno=%u"},
	65	{Opt_wfdno, "wfdno=%u"},
67543e50	66	{Opt_uname, "uname=%s"},
9e82cf6a EVH	67	{Opt_remotename, "aname=%s"},
	68	{Opt_unix, "proto=unix"},
	69	{Opt_tcp, "proto=tcp"},
	70	{Opt_fd, "proto=fd"},
bd238fb4 LI	71	#ifdef CONFIG_PCI_9P
	72	{Opt_pci, "proto=pci"},
	73	#endif
9e82cf6a EVH	74	{Opt_tcp, "tcp"},
	75	{Opt_unix, "unix"},
	76	{Opt_fd, "fd"},
	77	{Opt_legacy, "noextend"},
	78	{Opt_nodevmap, "nodevmap"},
e03abc0c EVH	79	{Opt_cache_loose, "cache=loose"},
e03abc0c EVH	80	{Opt_cache_loose, "loose"},
9e82cf6a EVH	81	{Opt_err, NULL}
	82	};
	83
bd238fb4 LI	84	extern struct p9_transport *p9pci_trans_create(void);
bd238fb4 LI	85
9e82cf6a EVH	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	124	if ((ret = match_int(&args[0], &option)) < 0) {
bd238fb4	125	P9_DPRINTK(P9_DEBUG_ERROR,
9e82cf6a EVH	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;
9e82cf6a EVH	152	case Opt_tcp:
	153	v9ses->proto = PROTO_TCP;
	154	break;
	155	case Opt_unix:
	156	v9ses->proto = PROTO_UNIX;
	157	break;
bd238fb4 LI	158	case Opt_pci:
	159	v9ses->proto = PROTO_PCI;
	160	break;
9e82cf6a EVH	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
9e82cf6a EVH	185	/**
	186	* v9fs_session_init - initialize session
	187	* @v9ses: session information structure
	188	* @dev_name: device being mounted
	189	* @data: options
	190	*
	191	*/
	192
bd238fb4	193	struct p9_fid v9fs_session_init(struct v9fs_session_info v9ses,
9e82cf6a EVH	194	const char dev_name, char data)
9e82cf6a EVH	195	{
9e82cf6a	196	int retval = -EINVAL;
bd238fb4 LI	197	struct p9_transport *trans;
bd238fb4 LI	198	struct p9_fid *fid;
9e82cf6a EVH	199
	200	v9ses->name = __getname();
	201	if (!v9ses->name)
bd238fb4	202	return ERR_PTR(-ENOMEM);
9e82cf6a EVH	203
	204	v9ses->remotename = __getname();
	205	if (!v9ses->remotename) {
ce44eeb6	206	__putname(v9ses->name);
bd238fb4	207	return ERR_PTR(-ENOMEM);
9e82cf6a EVH	208	}
	209
	210	strcpy(v9ses->name, V9FS_DEFUSER);
	211	strcpy(v9ses->remotename, V9FS_DEFANAME);
	212
	213	v9fs_parse_options(data, v9ses);
	214
9e82cf6a EVH	215	switch (v9ses->proto) {
9e82cf6a EVH	216	case PROTO_TCP:
bd238fb4	217	trans = p9_trans_create_tcp(dev_name, v9ses->port);
9e82cf6a EVH	218	break;
9e82cf6a EVH	219	case PROTO_UNIX:
bd238fb4	220	trans = p9_trans_create_unix(dev_name);
9e82cf6a EVH	221	*v9ses->remotename = 0;
	222	break;
	223	case PROTO_FD:
bd238fb4 LI	224	trans = p9_trans_create_fd(v9ses->rfdno, v9ses->wfdno);
	225	*v9ses->remotename = 0;
	226	break;
	227	#ifdef CONFIG_PCI_9P
	228	case PROTO_PCI:
	229	trans = p9pci_trans_create();
9e82cf6a	230	*v9ses->remotename = 0;
9e82cf6a	231	break;
bd238fb4	232	#endif
9e82cf6a EVH	233	default:
	234	printk(KERN_ERR "v9fs: Bad mount protocol %d\n", v9ses->proto);
	235	retval = -ENOPROTOOPT;
bd238fb4	236	goto error;
9e82cf6a EVH	237	};
9e82cf6a EVH	238
bd238fb4 LI	239	if (IS_ERR(trans)) {
	240	retval = PTR_ERR(trans);
	241	trans = NULL;
	242	goto error;
a8e63bff LI	243	}
a8e63bff LI	244
bd238fb4 LI	245	v9ses->clnt = p9_client_create(trans, v9ses->maxdata + P9_IOHDRSZ,
bd238fb4 LI	246	v9ses->extended);
9e82cf6a	247
bd238fb4 LI	248	if (IS_ERR(v9ses->clnt)) {
	249	retval = PTR_ERR(v9ses->clnt);
	250	v9ses->clnt = NULL;
	251	P9_DPRINTK(P9_DEBUG_ERROR, "problem initializing 9p client\n");
	252	goto error;
9e82cf6a EVH	253	}
9e82cf6a EVH	254
bd238fb4 LI	255	fid = p9_client_attach(v9ses->clnt, NULL, v9ses->name,
	256	v9ses->remotename);
	257	if (IS_ERR(fid)) {
	258	retval = PTR_ERR(fid);
	259	fid = NULL;
	260	P9_DPRINTK(P9_DEBUG_ERROR, "cannot attach\n");
	261	goto error;
9e82cf6a EVH	262	}
9e82cf6a EVH	263
bd238fb4	264	return fid;
9e82cf6a	265
bd238fb4	266	error:
9e82cf6a	267	v9fs_session_close(v9ses);
bd238fb4	268	return ERR_PTR(retval);
9e82cf6a EVH	269	}
	270
	271	/**
	272	* v9fs_session_close - shutdown a session
	273	* @v9ses: session information structure
	274	*
	275	*/
	276
	277	void v9fs_session_close(struct v9fs_session_info *v9ses)
	278	{
bd238fb4 LI	279	if (v9ses->clnt) {
	280	p9_client_destroy(v9ses->clnt);
	281	v9ses->clnt = NULL;
3cf6429a	282	}
9e82cf6a	283
ce44eeb6 DA	284	__putname(v9ses->name);
ce44eeb6 DA	285	__putname(v9ses->remotename);
9e82cf6a EVH	286	}
9e82cf6a EVH	287
322b329a EVH	288	/**
	289	* v9fs_session_cancel - mark transport as disconnected
	290	* and cancel all pending requests.
	291	*/
	292	void v9fs_session_cancel(struct v9fs_session_info *v9ses) {
bd238fb4 LI	293	P9_DPRINTK(P9_DEBUG_ERROR, "cancel session %p\n", v9ses);
bd238fb4 LI	294	p9_client_disconnect(v9ses->clnt);
322b329a EVH	295	}
322b329a EVH	296
9e82cf6a EVH	297	extern int v9fs_error_init(void);
	298
	299	/**
	300	* v9fs_init - Initialize module
	301	*
	302	*/
	303
	304	static int __init init_v9fs(void)
	305	{
f94b3470	306	printk(KERN_INFO "Installing v9fs 9p2000 file system support\n");
9e82cf6a	307
bd238fb4	308	return register_filesystem(&v9fs_fs_type);
9e82cf6a EVH	309	}
	310
	311	/**
	312	* v9fs_init - shutdown module
	313	*
	314	*/
	315
	316	static void __exit exit_v9fs(void)
	317	{
	318	unregister_filesystem(&v9fs_fs_type);
	319	}
	320
	321	module_init(init_v9fs)
	322	module_exit(exit_v9fs)
	323
bd238fb4	324	MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
9e82cf6a EVH	325	MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
	326	MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
	327	MODULE_LICENSE("GPL");