[mirror_ubuntu-zesty-kernel.git] / fs / 9p / 9p.c

/*
 *  linux/fs/9p/9p.c
 *
 *  This file contains functions to perform synchronous 9P calls
 *
 *  Copyright (C) 2004 by Latchesar Ionkov <lucho@ionkov.net>
 *  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/idr.h>

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

/**
 * v9fs_t_version - negotiate protocol parameters with sever
 * @v9ses: 9P2000 session information
 * @msize: requested max size packet
 * @version: requested version.extension string
 * @fcall: pointer to response fcall pointer
 *
 */

int
v9fs_t_version(struct v9fs_session_info *v9ses, u32 msize,
	       char *version, struct v9fs_fcall **rcp)
{
	int ret;
	struct v9fs_fcall *tc;

	dprintk(DEBUG_9P, "msize: %d version: %s\n", msize, version);
	tc = v9fs_create_tversion(msize, version);

	if (!IS_ERR(tc)) {
		ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
		kfree(tc);
	} else
		ret = PTR_ERR(tc);

	return ret;
}

/**
 * v9fs_t_attach - mount the server
 * @v9ses: 9P2000 session information
 * @uname: user name doing the attach
 * @aname: remote name being attached to
 * @fid: mount fid to attatch to root node
 * @afid: authentication fid (in this case result key)
 * @fcall: pointer to response fcall pointer
 *
 */

int
v9fs_t_attach(struct v9fs_session_info *v9ses, char *uname, char *aname,
	      u32 fid, u32 afid, struct v9fs_fcall **rcp)
{
	int ret;
	struct v9fs_fcall* tc;

	dprintk(DEBUG_9P, "uname '%s' aname '%s' fid %d afid %d\n", uname,
		aname, fid, afid);

	tc = v9fs_create_tattach(fid, afid, uname, aname);
	if (!IS_ERR(tc)) {
		ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
		kfree(tc);
	} else
		ret = PTR_ERR(tc);

	return ret;
}

static void v9fs_t_clunk_cb(void *a, struct v9fs_fcall *tc,
	struct v9fs_fcall *rc, int err)
{
	int fid;
	struct v9fs_session_info *v9ses;

	if (err)
		return;

	fid = tc->params.tclunk.fid;
	kfree(tc);

	if (!rc)
		return;

	v9ses = a;
	if (rc->id == RCLUNK)
		v9fs_put_idpool(fid, &v9ses->fidpool);

	kfree(rc);
}

/**
 * v9fs_t_clunk - release a fid (finish a transaction)
 * @v9ses: 9P2000 session information
 * @fid: fid to release
 * @fcall: pointer to response fcall pointer
 *
 */

int
v9fs_t_clunk(struct v9fs_session_info *v9ses, u32 fid)
{
	int ret;
	struct v9fs_fcall *tc, *rc;

	dprintk(DEBUG_9P, "fid %d\n", fid);

	rc = NULL;
	tc = v9fs_create_tclunk(fid);
	if (!IS_ERR(tc))
		ret = v9fs_mux_rpc(v9ses->mux, tc, &rc);
	else
		ret = PTR_ERR(tc);

	if (ret)
		dprintk(DEBUG_ERROR, "failed fid %d err %d\n", fid, ret);

	v9fs_t_clunk_cb(v9ses, tc, rc, ret);
	return ret;
}

#if 0
/**
 * v9fs_v9fs_t_flush - flush a pending transaction
 * @v9ses: 9P2000 session information
 * @tag: tid to release
 *
 */

int v9fs_t_flush(struct v9fs_session_info *v9ses, u16 oldtag)
{
	int ret;
	struct v9fs_fcall *tc;

	dprintk(DEBUG_9P, "oldtag %d\n", oldtag);

	tc = v9fs_create_tflush(oldtag);
	if (!IS_ERR(tc)) {
		ret = v9fs_mux_rpc(v9ses->mux, tc, NULL);
		kfree(tc);
	} else
		ret = PTR_ERR(tc);

	return ret;
}
#endif  /*  0  */

/**
 * v9fs_t_stat - read a file's meta-data
 * @v9ses: 9P2000 session information
 * @fid: fid pointing to file or directory to get info about
 * @fcall: pointer to response fcall
 *
 */

int
v9fs_t_stat(struct v9fs_session_info *v9ses, u32 fid, struct v9fs_fcall **rcp)
{
	int ret;
	struct v9fs_fcall *tc;

	dprintk(DEBUG_9P, "fid %d\n", fid);

	ret = -ENOMEM;
	tc = v9fs_create_tstat(fid);
	if (!IS_ERR(tc)) {
		ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
		kfree(tc);
	} else
		ret = PTR_ERR(tc);

	return ret;
}

/**
 * v9fs_t_wstat - write a file's meta-data
 * @v9ses: 9P2000 session information
 * @fid: fid pointing to file or directory to write info about
 * @stat: metadata
 * @fcall: pointer to response fcall
 *
 */

int
v9fs_t_wstat(struct v9fs_session_info *v9ses, u32 fid,
	     struct v9fs_wstat *wstat, struct v9fs_fcall **rcp)
{
	int ret;
	struct v9fs_fcall *tc;

	dprintk(DEBUG_9P, "fid %d\n", fid);

	tc = v9fs_create_twstat(fid, wstat, v9ses->extended);
	if (!IS_ERR(tc)) {
		ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
		kfree(tc);
	} else
		ret = PTR_ERR(tc);

	return ret;
}

/**
 * v9fs_t_walk - walk a fid to a new file or directory
 * @v9ses: 9P2000 session information
 * @fid: fid to walk
 * @newfid: new fid (for clone operations)
 * @name: path to walk fid to
 * @fcall: pointer to response fcall
 *
 */

/* TODO: support multiple walk */

int
v9fs_t_walk(struct v9fs_session_info *v9ses, u32 fid, u32 newfid,
	    char *name, struct v9fs_fcall **rcp)
{
	int ret;
	struct v9fs_fcall *tc;
	int nwname;

	dprintk(DEBUG_9P, "fid %d newfid %d wname '%s'\n", fid, newfid, name);

	if (name)
		nwname = 1;
	else
		nwname = 0;

	tc = v9fs_create_twalk(fid, newfid, nwname, &name);
	if (!IS_ERR(tc)) {
		ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
		kfree(tc);
	} else
		ret = PTR_ERR(tc);

	return ret;
}

/**
 * v9fs_t_open - open a file
 *
 * @v9ses - 9P2000 session information
 * @fid - fid to open
 * @mode - mode to open file (R, RW, etc)
 * @fcall - pointer to response fcall
 *
 */

int
v9fs_t_open(struct v9fs_session_info *v9ses, u32 fid, u8 mode,
	    struct v9fs_fcall **rcp)
{
	int ret;
	struct v9fs_fcall *tc;

	dprintk(DEBUG_9P, "fid %d mode %d\n", fid, mode);

	tc = v9fs_create_topen(fid, mode);
	if (!IS_ERR(tc)) {
		ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
		kfree(tc);
	} else
		ret = PTR_ERR(tc);

	return ret;
}

/**
 * v9fs_t_remove - remove a file or directory
 * @v9ses: 9P2000 session information
 * @fid: fid to remove
 * @fcall: pointer to response fcall
 *
 */

int
v9fs_t_remove(struct v9fs_session_info *v9ses, u32 fid,
	      struct v9fs_fcall **rcp)
{
	int ret;
	struct v9fs_fcall *tc;

	dprintk(DEBUG_9P, "fid %d\n", fid);

	tc = v9fs_create_tremove(fid);
	if (!IS_ERR(tc)) {
		ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
		kfree(tc);
	} else
		ret = PTR_ERR(tc);

	return ret;
}

/**
 * v9fs_t_create - create a file or directory
 * @v9ses: 9P2000 session information
 * @fid: fid to create
 * @name: name of the file or directory to create
 * @perm: permissions to create with
 * @mode: mode to open file (R, RW, etc)
 * @fcall: pointer to response fcall
 *
 */

int
v9fs_t_create(struct v9fs_session_info *v9ses, u32 fid, char *name,
	      u32 perm, u8 mode, struct v9fs_fcall **rcp)
{
	int ret;
	struct v9fs_fcall *tc;

	dprintk(DEBUG_9P, "fid %d name '%s' perm %x mode %d\n",
		fid, name, perm, mode);

	tc = v9fs_create_tcreate(fid, name, perm, mode);
	if (!IS_ERR(tc)) {
		ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
		kfree(tc);
	} else
		ret = PTR_ERR(tc);

	return ret;
}

/**
 * v9fs_t_read - read data
 * @v9ses: 9P2000 session information
 * @fid: fid to read from
 * @offset: offset to start read at
 * @count: how many bytes to read
 * @fcall: pointer to response fcall (with data)
 *
 */

int
v9fs_t_read(struct v9fs_session_info *v9ses, u32 fid, u64 offset,
	    u32 count, struct v9fs_fcall **rcp)
{
	int ret;
	struct v9fs_fcall *tc, *rc;

	dprintk(DEBUG_9P, "fid %d offset 0x%llux count 0x%x\n", fid,
		(long long unsigned) offset, count);

	tc = v9fs_create_tread(fid, offset, count);
	if (!IS_ERR(tc)) {
		ret = v9fs_mux_rpc(v9ses->mux, tc, &rc);
		if (!ret)
			ret = rc->params.rread.count;
		if (rcp)
			*rcp = rc;
		else
			kfree(rc);

		kfree(tc);
	} else
		ret = PTR_ERR(tc);

	return ret;
}

/**
 * v9fs_t_write - write data
 * @v9ses: 9P2000 session information
 * @fid: fid to write to
 * @offset: offset to start write at
 * @count: how many bytes to write
 * @fcall: pointer to response fcall
 *
 */

int
v9fs_t_write(struct v9fs_session_info *v9ses, u32 fid, u64 offset, u32 count,
	const char __user *data, struct v9fs_fcall **rcp)
{
	int ret;
	struct v9fs_fcall *tc, *rc;

	dprintk(DEBUG_9P, "fid %d offset 0x%llux count 0x%x\n", fid,
		(long long unsigned) offset, count);

	tc = v9fs_create_twrite(fid, offset, count, data);
	if (!IS_ERR(tc)) {
		ret = v9fs_mux_rpc(v9ses->mux, tc, &rc);

		if (!ret)
			ret = rc->params.rwrite.count;
		if (rcp)
			*rcp = rc;
		else
			kfree(rc);

		kfree(tc);
	} else
		ret = PTR_ERR(tc);

	return ret;
}
Commit	Line	Data
b8cf945b EVH	1	/*
	2	* linux/fs/9p/9p.c
	3	*
531b1094	4	* This file contains functions to perform synchronous 9P calls
b8cf945b	5	*
531b1094	6	* Copyright (C) 2004 by Latchesar Ionkov <lucho@ionkov.net>
b8cf945b EVH	7	* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
	8	* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or
	13	* (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to:
	22	* Free Software Foundation
	23	* 51 Franklin Street, Fifth Floor
	24	* Boston, MA 02111-1301 USA
	25	*
	26	*/
	27
	28	#include <linux/config.h>
	29	#include <linux/module.h>
	30	#include <linux/errno.h>
	31	#include <linux/fs.h>
	32	#include <linux/idr.h>
	33
	34	#include "debug.h"
	35	#include "v9fs.h"
	36	#include "9p.h"
531b1094	37	#include "conv.h"
b8cf945b EVH	38	#include "mux.h"
	39
	40	/**
	41	* v9fs_t_version - negotiate protocol parameters with sever
	42	* @v9ses: 9P2000 session information
	43	* @msize: requested max size packet
	44	* @version: requested version.extension string
	45	* @fcall: pointer to response fcall pointer
	46	*
	47	*/
	48
	49	int
	50	v9fs_t_version(struct v9fs_session_info *v9ses, u32 msize,
531b1094	51	char version, struct v9fs_fcall *rcp)
b8cf945b	52	{
531b1094 LI	53	int ret;
531b1094 LI	54	struct v9fs_fcall *tc;
b8cf945b EVH	55
b8cf945b EVH	56	dprintk(DEBUG_9P, "msize: %d version: %s\n", msize, version);
531b1094	57	tc = v9fs_create_tversion(msize, version);
b8cf945b	58
531b1094 LI	59	if (!IS_ERR(tc)) {
	60	ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
	61	kfree(tc);
	62	} else
	63	ret = PTR_ERR(tc);
	64
	65	return ret;
b8cf945b EVH	66	}
	67
	68	/**
	69	* v9fs_t_attach - mount the server
	70	* @v9ses: 9P2000 session information
	71	* @uname: user name doing the attach
	72	* @aname: remote name being attached to
	73	* @fid: mount fid to attatch to root node
	74	* @afid: authentication fid (in this case result key)
	75	* @fcall: pointer to response fcall pointer
	76	*
	77	*/
	78
	79	int
	80	v9fs_t_attach(struct v9fs_session_info v9ses, char uname, char *aname,
531b1094	81	u32 fid, u32 afid, struct v9fs_fcall **rcp)
b8cf945b	82	{
531b1094 LI	83	int ret;
531b1094 LI	84	struct v9fs_fcall* tc;
b8cf945b EVH	85
	86	dprintk(DEBUG_9P, "uname '%s' aname '%s' fid %d afid %d\n", uname,
	87	aname, fid, afid);
b8cf945b	88
531b1094 LI	89	tc = v9fs_create_tattach(fid, afid, uname, aname);
	90	if (!IS_ERR(tc)) {
	91	ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
	92	kfree(tc);
	93	} else
	94	ret = PTR_ERR(tc);
	95
	96	return ret;
3cf6429a LI	97	}
	98
	99	static void v9fs_t_clunk_cb(void a, struct v9fs_fcall tc,
	100	struct v9fs_fcall *rc, int err)
	101	{
	102	int fid;
	103	struct v9fs_session_info *v9ses;
	104
	105	if (err)
	106	return;
	107
	108	fid = tc->params.tclunk.fid;
	109	kfree(tc);
	110
	111	if (!rc)
	112	return;
	113
3cf6429a LI	114	v9ses = a;
	115	if (rc->id == RCLUNK)
	116	v9fs_put_idpool(fid, &v9ses->fidpool);
	117
	118	kfree(rc);
b8cf945b EVH	119	}
	120
	121	/**
	122	* v9fs_t_clunk - release a fid (finish a transaction)
	123	* @v9ses: 9P2000 session information
	124	* @fid: fid to release
	125	* @fcall: pointer to response fcall pointer
	126	*
	127	*/
531b1094	128
b8cf945b	129	int
3cf6429a	130	v9fs_t_clunk(struct v9fs_session_info *v9ses, u32 fid)
b8cf945b	131	{
531b1094	132	int ret;
3cf6429a LI	133	struct v9fs_fcall tc, rc;
3cf6429a LI	134
b8cf945b	135	dprintk(DEBUG_9P, "fid %d\n", fid);
b8cf945b	136
531b1094 LI	137	rc = NULL;
	138	tc = v9fs_create_tclunk(fid);
	139	if (!IS_ERR(tc))
	140	ret = v9fs_mux_rpc(v9ses->mux, tc, &rc);
	141	else
	142	ret = PTR_ERR(tc);
	143
	144	if (ret)
	145	dprintk(DEBUG_ERROR, "failed fid %d err %d\n", fid, ret);
3cf6429a	146
531b1094 LI	147	v9fs_t_clunk_cb(v9ses, tc, rc, ret);
531b1094 LI	148	return ret;
b8cf945b EVH	149	}
b8cf945b EVH	150
29c6e486	151	#if 0
b8cf945b EVH	152	/**
	153	* v9fs_v9fs_t_flush - flush a pending transaction
	154	* @v9ses: 9P2000 session information
	155	* @tag: tid to release
	156	*
	157	*/
	158
531b1094	159	int v9fs_t_flush(struct v9fs_session_info *v9ses, u16 oldtag)
b8cf945b	160	{
531b1094 LI	161	int ret;
531b1094 LI	162	struct v9fs_fcall *tc;
b8cf945b	163
531b1094 LI	164	dprintk(DEBUG_9P, "oldtag %d\n", oldtag);
531b1094 LI	165
531b1094 LI	166	tc = v9fs_create_tflush(oldtag);
	167	if (!IS_ERR(tc)) {
	168	ret = v9fs_mux_rpc(v9ses->mux, tc, NULL);
	169	kfree(tc);
	170	} else
	171	ret = PTR_ERR(tc);
	172
	173	return ret;
b8cf945b	174	}
29c6e486	175	#endif /* 0 */
b8cf945b EVH	176
	177	/**
	178	* v9fs_t_stat - read a file's meta-data
	179	* @v9ses: 9P2000 session information
	180	* @fid: fid pointing to file or directory to get info about
	181	* @fcall: pointer to response fcall
	182	*
	183	*/
	184
	185	int
531b1094	186	v9fs_t_stat(struct v9fs_session_info v9ses, u32 fid, struct v9fs_fcall *rcp)
b8cf945b	187	{
531b1094 LI	188	int ret;
531b1094 LI	189	struct v9fs_fcall *tc;
b8cf945b EVH	190
b8cf945b EVH	191	dprintk(DEBUG_9P, "fid %d\n", fid);
b8cf945b	192
531b1094 LI	193	ret = -ENOMEM;
	194	tc = v9fs_create_tstat(fid);
	195	if (!IS_ERR(tc)) {
	196	ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
	197	kfree(tc);
	198	} else
	199	ret = PTR_ERR(tc);
	200
	201	return ret;
b8cf945b EVH	202	}
	203
	204	/**
	205	* v9fs_t_wstat - write a file's meta-data
	206	* @v9ses: 9P2000 session information
	207	* @fid: fid pointing to file or directory to write info about
	208	* @stat: metadata
	209	* @fcall: pointer to response fcall
	210	*
	211	*/
	212
	213	int
	214	v9fs_t_wstat(struct v9fs_session_info *v9ses, u32 fid,
531b1094	215	struct v9fs_wstat wstat, struct v9fs_fcall *rcp)
b8cf945b	216	{
531b1094 LI	217	int ret;
531b1094 LI	218	struct v9fs_fcall *tc;
b8cf945b	219
531b1094 LI	220	dprintk(DEBUG_9P, "fid %d\n", fid);
531b1094 LI	221
531b1094 LI	222	tc = v9fs_create_twstat(fid, wstat, v9ses->extended);
	223	if (!IS_ERR(tc)) {
	224	ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
	225	kfree(tc);
	226	} else
	227	ret = PTR_ERR(tc);
b8cf945b	228
531b1094	229	return ret;
b8cf945b EVH	230	}
	231
	232	/**
	233	* v9fs_t_walk - walk a fid to a new file or directory
	234	* @v9ses: 9P2000 session information
	235	* @fid: fid to walk
	236	* @newfid: new fid (for clone operations)
	237	* @name: path to walk fid to
	238	* @fcall: pointer to response fcall
	239	*
	240	*/
	241
	242	/* TODO: support multiple walk */
	243
	244	int
	245	v9fs_t_walk(struct v9fs_session_info *v9ses, u32 fid, u32 newfid,
531b1094	246	char name, struct v9fs_fcall *rcp)
b8cf945b	247	{
531b1094 LI	248	int ret;
	249	struct v9fs_fcall *tc;
	250	int nwname;
b8cf945b EVH	251
b8cf945b EVH	252	dprintk(DEBUG_9P, "fid %d newfid %d wname '%s'\n", fid, newfid, name);
531b1094 LI	253
	254	if (name)
	255	nwname = 1;
	256	else
	257	nwname = 0;
	258
531b1094 LI	259	tc = v9fs_create_twalk(fid, newfid, nwname, &name);
	260	if (!IS_ERR(tc)) {
	261	ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
	262	kfree(tc);
	263	} else
	264	ret = PTR_ERR(tc);
	265
	266	return ret;
b8cf945b EVH	267	}
	268
	269	/**
	270	* v9fs_t_open - open a file
	271	*
	272	* @v9ses - 9P2000 session information
	273	* @fid - fid to open
	274	* @mode - mode to open file (R, RW, etc)
	275	* @fcall - pointer to response fcall
	276	*
	277	*/
	278
	279	int
	280	v9fs_t_open(struct v9fs_session_info *v9ses, u32 fid, u8 mode,
531b1094	281	struct v9fs_fcall **rcp)
b8cf945b	282	{
531b1094 LI	283	int ret;
531b1094 LI	284	struct v9fs_fcall *tc;
b8cf945b EVH	285
b8cf945b EVH	286	dprintk(DEBUG_9P, "fid %d mode %d\n", fid, mode);
b8cf945b	287
531b1094 LI	288	tc = v9fs_create_topen(fid, mode);
	289	if (!IS_ERR(tc)) {
	290	ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
	291	kfree(tc);
	292	} else
	293	ret = PTR_ERR(tc);
b8cf945b	294
531b1094	295	return ret;
b8cf945b EVH	296	}
	297
	298	/**
	299	* v9fs_t_remove - remove a file or directory
	300	* @v9ses: 9P2000 session information
	301	* @fid: fid to remove
	302	* @fcall: pointer to response fcall
	303	*
	304	*/
	305
	306	int
	307	v9fs_t_remove(struct v9fs_session_info *v9ses, u32 fid,
531b1094	308	struct v9fs_fcall **rcp)
b8cf945b	309	{
531b1094 LI	310	int ret;
531b1094 LI	311	struct v9fs_fcall *tc;
b8cf945b EVH	312
b8cf945b EVH	313	dprintk(DEBUG_9P, "fid %d\n", fid);
531b1094	314
531b1094 LI	315	tc = v9fs_create_tremove(fid);
	316	if (!IS_ERR(tc)) {
	317	ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
	318	kfree(tc);
	319	} else
	320	ret = PTR_ERR(tc);
	321
	322	return ret;
b8cf945b EVH	323	}
	324
	325	/**
	326	* v9fs_t_create - create a file or directory
	327	* @v9ses: 9P2000 session information
	328	* @fid: fid to create
	329	* @name: name of the file or directory to create
	330	* @perm: permissions to create with
	331	* @mode: mode to open file (R, RW, etc)
	332	* @fcall: pointer to response fcall
	333	*
	334	*/
	335
	336	int
	337	v9fs_t_create(struct v9fs_session_info v9ses, u32 fid, char name,
531b1094	338	u32 perm, u8 mode, struct v9fs_fcall **rcp)
b8cf945b	339	{
531b1094 LI	340	int ret;
531b1094 LI	341	struct v9fs_fcall *tc;
b8cf945b EVH	342
	343	dprintk(DEBUG_9P, "fid %d name '%s' perm %x mode %d\n",
	344	fid, name, perm, mode);
	345
531b1094 LI	346	tc = v9fs_create_tcreate(fid, name, perm, mode);
	347	if (!IS_ERR(tc)) {
	348	ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
	349	kfree(tc);
	350	} else
	351	ret = PTR_ERR(tc);
b8cf945b	352
531b1094	353	return ret;
b8cf945b EVH	354	}
	355
	356	/**
	357	* v9fs_t_read - read data
	358	* @v9ses: 9P2000 session information
	359	* @fid: fid to read from
	360	* @offset: offset to start read at
	361	* @count: how many bytes to read
	362	* @fcall: pointer to response fcall (with data)
	363	*
	364	*/
	365
	366	int
	367	v9fs_t_read(struct v9fs_session_info *v9ses, u32 fid, u64 offset,
531b1094	368	u32 count, struct v9fs_fcall **rcp)
b8cf945b	369	{
531b1094 LI	370	int ret;
531b1094 LI	371	struct v9fs_fcall tc, rc;
b8cf945b	372
531b1094 LI	373	dprintk(DEBUG_9P, "fid %d offset 0x%llux count 0x%x\n", fid,
	374	(long long unsigned) offset, count);
	375
531b1094 LI	376	tc = v9fs_create_tread(fid, offset, count);
	377	if (!IS_ERR(tc)) {
	378	ret = v9fs_mux_rpc(v9ses->mux, tc, &rc);
	379	if (!ret)
	380	ret = rc->params.rread.count;
	381	if (rcp)
	382	*rcp = rc;
	383	else
	384	kfree(rc);
	385
	386	kfree(tc);
	387	} else
	388	ret = PTR_ERR(tc);
	389
	390	return ret;
b8cf945b EVH	391	}
	392
	393	/**
	394	* v9fs_t_write - write data
	395	* @v9ses: 9P2000 session information
	396	* @fid: fid to write to
	397	* @offset: offset to start write at
	398	* @count: how many bytes to write
	399	* @fcall: pointer to response fcall
	400	*
	401	*/
	402
	403	int
531b1094 LI	404	v9fs_t_write(struct v9fs_session_info *v9ses, u32 fid, u64 offset, u32 count,
531b1094 LI	405	const char __user data, struct v9fs_fcall *rcp)
b8cf945b	406	{
531b1094 LI	407	int ret;
531b1094 LI	408	struct v9fs_fcall tc, rc;
b8cf945b	409
531b1094 LI	410	dprintk(DEBUG_9P, "fid %d offset 0x%llux count 0x%x\n", fid,
531b1094 LI	411	(long long unsigned) offset, count);
b8cf945b	412
531b1094 LI	413	tc = v9fs_create_twrite(fid, offset, count, data);
	414	if (!IS_ERR(tc)) {
	415	ret = v9fs_mux_rpc(v9ses->mux, tc, &rc);
b8cf945b	416
531b1094 LI	417	if (!ret)
	418	ret = rc->params.rwrite.count;
	419	if (rcp)
	420	*rcp = rc;
	421	else
	422	kfree(rc);
b8cf945b	423
531b1094 LI	424	kfree(tc);
	425	} else
	426	ret = PTR_ERR(tc);
b8cf945b	427
531b1094	428	return ret;
b8cf945b	429	}
531b1094	430