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remarkable-linux/fs/9p/fcall.c
Eric Van Hensbergen 67543e508d [PATCH] 9p: fix name consistency problems 
There were a number of conflicting naming schemes used in the v9fs project.
The directory was fs/9p, but MAINTAINERS and Documentation referred to
v9fs.  The module name itself was 9p2000, and the file system type was 9P.
This patch attempts to clean that up, changing all references to 9p in
order to match the directory name.  We'll also start using 9p instead of
v9fs as our patch prefix.

There is also a minor consistency cleanup in the options changing the name
option to uname in order to more closely match the Plan 9 options.

Signed-off-by: Eric Van Hensbergevan <ericvh@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-25 08:22:54 -08:00

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/*
* linux/fs/9p/fcall.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 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/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: tag 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
/**
* 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, char *extension, 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, extension,
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_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;
}
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