[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;

	dprintk(DEBUG_9P, "tcall id %d rcall id %d\n", tc->id, rc->id);
	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;
}

/**
 * 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;
}

/**
 * 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
	114	dprintk(DEBUG_9P, "tcall id %d rcall id %d\n", tc->id, rc->id);
	115	v9ses = a;
	116	if (rc->id == RCLUNK)
	117	v9fs_put_idpool(fid, &v9ses->fidpool);
	118
	119	kfree(rc);
b8cf945b EVH	120	}
	121
	122	/**
	123	* v9fs_t_clunk - release a fid (finish a transaction)
	124	* @v9ses: 9P2000 session information
	125	* @fid: fid to release
	126	* @fcall: pointer to response fcall pointer
	127	*
	128	*/
531b1094	129
b8cf945b	130	int
3cf6429a	131	v9fs_t_clunk(struct v9fs_session_info *v9ses, u32 fid)
b8cf945b	132	{
531b1094	133	int ret;
3cf6429a LI	134	struct v9fs_fcall tc, rc;
3cf6429a LI	135
b8cf945b	136	dprintk(DEBUG_9P, "fid %d\n", fid);
b8cf945b	137
531b1094 LI	138	rc = NULL;
	139	tc = v9fs_create_tclunk(fid);
	140	if (!IS_ERR(tc))
	141	ret = v9fs_mux_rpc(v9ses->mux, tc, &rc);
	142	else
	143	ret = PTR_ERR(tc);
	144
	145	if (ret)
	146	dprintk(DEBUG_ERROR, "failed fid %d err %d\n", fid, ret);
3cf6429a	147
531b1094 LI	148	v9fs_t_clunk_cb(v9ses, tc, rc, ret);
531b1094 LI	149	return ret;
b8cf945b EVH	150	}
	151
	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 EVH	174	}
	175
	176	/**
	177	* v9fs_t_stat - read a file's meta-data
	178	* @v9ses: 9P2000 session information
	179	* @fid: fid pointing to file or directory to get info about
	180	* @fcall: pointer to response fcall
	181	*
	182	*/
	183
	184	int
531b1094	185	v9fs_t_stat(struct v9fs_session_info v9ses, u32 fid, struct v9fs_fcall *rcp)
b8cf945b	186	{
531b1094 LI	187	int ret;
531b1094 LI	188	struct v9fs_fcall *tc;
b8cf945b EVH	189
b8cf945b EVH	190	dprintk(DEBUG_9P, "fid %d\n", fid);
b8cf945b	191
531b1094 LI	192	ret = -ENOMEM;
	193	tc = v9fs_create_tstat(fid);
	194	if (!IS_ERR(tc)) {
	195	ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
	196	kfree(tc);
	197	} else
	198	ret = PTR_ERR(tc);
	199
	200	return ret;
b8cf945b EVH	201	}
	202
	203	/**
	204	* v9fs_t_wstat - write a file's meta-data
	205	* @v9ses: 9P2000 session information
	206	* @fid: fid pointing to file or directory to write info about
	207	* @stat: metadata
	208	* @fcall: pointer to response fcall
	209	*
	210	*/
	211
	212	int
	213	v9fs_t_wstat(struct v9fs_session_info *v9ses, u32 fid,
531b1094	214	struct v9fs_wstat wstat, struct v9fs_fcall *rcp)
b8cf945b	215	{
531b1094 LI	216	int ret;
531b1094 LI	217	struct v9fs_fcall *tc;
b8cf945b	218
531b1094 LI	219	dprintk(DEBUG_9P, "fid %d\n", fid);
531b1094 LI	220
531b1094 LI	221	tc = v9fs_create_twstat(fid, wstat, v9ses->extended);
	222	if (!IS_ERR(tc)) {
	223	ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
	224	kfree(tc);
	225	} else
	226	ret = PTR_ERR(tc);
b8cf945b	227
531b1094	228	return ret;
b8cf945b EVH	229	}
	230
	231	/**
	232	* v9fs_t_walk - walk a fid to a new file or directory
	233	* @v9ses: 9P2000 session information
	234	* @fid: fid to walk
	235	* @newfid: new fid (for clone operations)
	236	* @name: path to walk fid to
	237	* @fcall: pointer to response fcall
	238	*
	239	*/
	240
	241	/* TODO: support multiple walk */
	242
	243	int
	244	v9fs_t_walk(struct v9fs_session_info *v9ses, u32 fid, u32 newfid,
531b1094	245	char name, struct v9fs_fcall *rcp)
b8cf945b	246	{
531b1094 LI	247	int ret;
	248	struct v9fs_fcall *tc;
	249	int nwname;
b8cf945b EVH	250
b8cf945b EVH	251	dprintk(DEBUG_9P, "fid %d newfid %d wname '%s'\n", fid, newfid, name);
531b1094 LI	252
	253	if (name)
	254	nwname = 1;
	255	else
	256	nwname = 0;
	257
531b1094 LI	258	tc = v9fs_create_twalk(fid, newfid, nwname, &name);
	259	if (!IS_ERR(tc)) {
	260	ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
	261	kfree(tc);
	262	} else
	263	ret = PTR_ERR(tc);
	264
	265	return ret;
b8cf945b EVH	266	}
	267
	268	/**
	269	* v9fs_t_open - open a file
	270	*
	271	* @v9ses - 9P2000 session information
	272	* @fid - fid to open
	273	* @mode - mode to open file (R, RW, etc)
	274	* @fcall - pointer to response fcall
	275	*
	276	*/
	277
	278	int
	279	v9fs_t_open(struct v9fs_session_info *v9ses, u32 fid, u8 mode,
531b1094	280	struct v9fs_fcall **rcp)
b8cf945b	281	{
531b1094 LI	282	int ret;
531b1094 LI	283	struct v9fs_fcall *tc;
b8cf945b EVH	284
b8cf945b EVH	285	dprintk(DEBUG_9P, "fid %d mode %d\n", fid, mode);
b8cf945b	286
531b1094 LI	287	tc = v9fs_create_topen(fid, mode);
	288	if (!IS_ERR(tc)) {
	289	ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
	290	kfree(tc);
	291	} else
	292	ret = PTR_ERR(tc);
b8cf945b	293
531b1094	294	return ret;
b8cf945b EVH	295	}
	296
	297	/**
	298	* v9fs_t_remove - remove a file or directory
	299	* @v9ses: 9P2000 session information
	300	* @fid: fid to remove
	301	* @fcall: pointer to response fcall
	302	*
	303	*/
	304
	305	int
	306	v9fs_t_remove(struct v9fs_session_info *v9ses, u32 fid,
531b1094	307	struct v9fs_fcall **rcp)
b8cf945b	308	{
531b1094 LI	309	int ret;
531b1094 LI	310	struct v9fs_fcall *tc;
b8cf945b EVH	311
b8cf945b EVH	312	dprintk(DEBUG_9P, "fid %d\n", fid);
531b1094	313
531b1094 LI	314	tc = v9fs_create_tremove(fid);
	315	if (!IS_ERR(tc)) {
	316	ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
	317	kfree(tc);
	318	} else
	319	ret = PTR_ERR(tc);
	320
	321	return ret;
b8cf945b EVH	322	}
	323
	324	/**
	325	* v9fs_t_create - create a file or directory
	326	* @v9ses: 9P2000 session information
	327	* @fid: fid to create
	328	* @name: name of the file or directory to create
	329	* @perm: permissions to create with
	330	* @mode: mode to open file (R, RW, etc)
	331	* @fcall: pointer to response fcall
	332	*
	333	*/
	334
	335	int
	336	v9fs_t_create(struct v9fs_session_info v9ses, u32 fid, char name,
531b1094	337	u32 perm, u8 mode, struct v9fs_fcall **rcp)
b8cf945b	338	{
531b1094 LI	339	int ret;
531b1094 LI	340	struct v9fs_fcall *tc;
b8cf945b EVH	341
	342	dprintk(DEBUG_9P, "fid %d name '%s' perm %x mode %d\n",
	343	fid, name, perm, mode);
	344
531b1094 LI	345	tc = v9fs_create_tcreate(fid, name, perm, mode);
	346	if (!IS_ERR(tc)) {
	347	ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
	348	kfree(tc);
	349	} else
	350	ret = PTR_ERR(tc);
b8cf945b	351
531b1094	352	return ret;
b8cf945b EVH	353	}
	354
	355	/**
	356	* v9fs_t_read - read data
	357	* @v9ses: 9P2000 session information
	358	* @fid: fid to read from
	359	* @offset: offset to start read at
	360	* @count: how many bytes to read
	361	* @fcall: pointer to response fcall (with data)
	362	*
	363	*/
	364
	365	int
	366	v9fs_t_read(struct v9fs_session_info *v9ses, u32 fid, u64 offset,
531b1094	367	u32 count, struct v9fs_fcall **rcp)
b8cf945b	368	{
531b1094 LI	369	int ret;
531b1094 LI	370	struct v9fs_fcall tc, rc;
b8cf945b	371
531b1094 LI	372	dprintk(DEBUG_9P, "fid %d offset 0x%llux count 0x%x\n", fid,
	373	(long long unsigned) offset, count);
	374
531b1094 LI	375	tc = v9fs_create_tread(fid, offset, count);
	376	if (!IS_ERR(tc)) {
	377	ret = v9fs_mux_rpc(v9ses->mux, tc, &rc);
	378	if (!ret)
	379	ret = rc->params.rread.count;
	380	if (rcp)
	381	*rcp = rc;
	382	else
	383	kfree(rc);
	384
	385	kfree(tc);
	386	} else
	387	ret = PTR_ERR(tc);
	388
	389	return ret;
b8cf945b EVH	390	}
	391
	392	/**
	393	* v9fs_t_write - write data
	394	* @v9ses: 9P2000 session information
	395	* @fid: fid to write to
	396	* @offset: offset to start write at
	397	* @count: how many bytes to write
	398	* @fcall: pointer to response fcall
	399	*
	400	*/
	401
	402	int
531b1094 LI	403	v9fs_t_write(struct v9fs_session_info *v9ses, u32 fid, u64 offset, u32 count,
531b1094 LI	404	const char __user data, struct v9fs_fcall *rcp)
b8cf945b	405	{
531b1094 LI	406	int ret;
531b1094 LI	407	struct v9fs_fcall tc, rc;
b8cf945b	408
531b1094 LI	409	dprintk(DEBUG_9P, "fid %d offset 0x%llux count 0x%x\n", fid,
531b1094 LI	410	(long long unsigned) offset, count);
b8cf945b	411
531b1094 LI	412	tc = v9fs_create_twrite(fid, offset, count, data);
	413	if (!IS_ERR(tc)) {
	414	ret = v9fs_mux_rpc(v9ses->mux, tc, &rc);
b8cf945b	415
531b1094 LI	416	if (!ret)
	417	ret = rc->params.rwrite.count;
	418	if (rcp)
	419	*rcp = rc;
	420	else
	421	kfree(rc);
b8cf945b	422
531b1094 LI	423	kfree(tc);
	424	} else
	425	ret = PTR_ERR(tc);
b8cf945b	426
531b1094	427	return ret;
b8cf945b	428	}
531b1094	429