mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-29 04:09:39 +00:00
![Eric Van Hensbergen](/assets/img/avatar_default.png)
This part of the patch contains the 9P protocol functions. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
359 lines
8.1 KiB
C
359 lines
8.1 KiB
C
/*
|
|
* linux/fs/9p/9p.c
|
|
*
|
|
* This file contains functions 9P2000 functions
|
|
*
|
|
* 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 "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 **fcall)
|
|
{
|
|
struct v9fs_fcall msg;
|
|
|
|
dprintk(DEBUG_9P, "msize: %d version: %s\n", msize, version);
|
|
msg.id = TVERSION;
|
|
msg.params.tversion.msize = msize;
|
|
msg.params.tversion.version = version;
|
|
|
|
return v9fs_mux_rpc(v9ses, &msg, fcall);
|
|
}
|
|
|
|
/**
|
|
* 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 **fcall)
|
|
{
|
|
struct v9fs_fcall msg;
|
|
|
|
dprintk(DEBUG_9P, "uname '%s' aname '%s' fid %d afid %d\n", uname,
|
|
aname, fid, afid);
|
|
msg.id = TATTACH;
|
|
msg.params.tattach.fid = fid;
|
|
msg.params.tattach.afid = afid;
|
|
msg.params.tattach.uname = uname;
|
|
msg.params.tattach.aname = aname;
|
|
|
|
return v9fs_mux_rpc(v9ses, &msg, fcall);
|
|
}
|
|
|
|
/**
|
|
* 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,
|
|
struct v9fs_fcall **fcall)
|
|
{
|
|
struct v9fs_fcall msg;
|
|
|
|
dprintk(DEBUG_9P, "fid %d\n", fid);
|
|
msg.id = TCLUNK;
|
|
msg.params.tclunk.fid = fid;
|
|
|
|
return v9fs_mux_rpc(v9ses, &msg, fcall);
|
|
}
|
|
|
|
/**
|
|
* 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 tag)
|
|
{
|
|
struct v9fs_fcall msg;
|
|
|
|
dprintk(DEBUG_9P, "oldtag %d\n", tag);
|
|
msg.id = TFLUSH;
|
|
msg.params.tflush.oldtag = tag;
|
|
return v9fs_mux_rpc(v9ses, &msg, NULL);
|
|
}
|
|
|
|
/**
|
|
* 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 **fcall)
|
|
{
|
|
struct v9fs_fcall msg;
|
|
|
|
dprintk(DEBUG_9P, "fid %d\n", fid);
|
|
if (fcall)
|
|
*fcall = NULL;
|
|
|
|
msg.id = TSTAT;
|
|
msg.params.tstat.fid = fid;
|
|
return v9fs_mux_rpc(v9ses, &msg, fcall);
|
|
}
|
|
|
|
/**
|
|
* 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_stat *stat, struct v9fs_fcall **fcall)
|
|
{
|
|
struct v9fs_fcall msg;
|
|
|
|
dprintk(DEBUG_9P, "fid %d length %d\n", fid, (int)stat->length);
|
|
msg.id = TWSTAT;
|
|
msg.params.twstat.fid = fid;
|
|
msg.params.twstat.stat = stat;
|
|
|
|
return v9fs_mux_rpc(v9ses, &msg, fcall);
|
|
}
|
|
|
|
/**
|
|
* 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 **fcall)
|
|
{
|
|
struct v9fs_fcall msg;
|
|
|
|
dprintk(DEBUG_9P, "fid %d newfid %d wname '%s'\n", fid, newfid, name);
|
|
msg.id = TWALK;
|
|
msg.params.twalk.fid = fid;
|
|
msg.params.twalk.newfid = newfid;
|
|
|
|
if (name) {
|
|
msg.params.twalk.nwname = 1;
|
|
msg.params.twalk.wnames = &name;
|
|
} else {
|
|
msg.params.twalk.nwname = 0;
|
|
}
|
|
|
|
return v9fs_mux_rpc(v9ses, &msg, fcall);
|
|
}
|
|
|
|
/**
|
|
* 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 **fcall)
|
|
{
|
|
struct v9fs_fcall msg;
|
|
long errorno = -1;
|
|
|
|
dprintk(DEBUG_9P, "fid %d mode %d\n", fid, mode);
|
|
msg.id = TOPEN;
|
|
msg.params.topen.fid = fid;
|
|
msg.params.topen.mode = mode;
|
|
|
|
errorno = v9fs_mux_rpc(v9ses, &msg, fcall);
|
|
|
|
return errorno;
|
|
}
|
|
|
|
/**
|
|
* 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 **fcall)
|
|
{
|
|
struct v9fs_fcall msg;
|
|
|
|
dprintk(DEBUG_9P, "fid %d\n", fid);
|
|
msg.id = TREMOVE;
|
|
msg.params.tremove.fid = fid;
|
|
return v9fs_mux_rpc(v9ses, &msg, fcall);
|
|
}
|
|
|
|
/**
|
|
* 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 **fcall)
|
|
{
|
|
struct v9fs_fcall msg;
|
|
|
|
dprintk(DEBUG_9P, "fid %d name '%s' perm %x mode %d\n",
|
|
fid, name, perm, mode);
|
|
|
|
msg.id = TCREATE;
|
|
msg.params.tcreate.fid = fid;
|
|
msg.params.tcreate.name = name;
|
|
msg.params.tcreate.perm = perm;
|
|
msg.params.tcreate.mode = mode;
|
|
|
|
return v9fs_mux_rpc(v9ses, &msg, fcall);
|
|
}
|
|
|
|
/**
|
|
* 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 **fcall)
|
|
{
|
|
struct v9fs_fcall msg;
|
|
struct v9fs_fcall *rc = NULL;
|
|
long errorno = -1;
|
|
|
|
dprintk(DEBUG_9P, "fid %d offset 0x%lx count 0x%x\n", fid,
|
|
(long unsigned int)offset, count);
|
|
msg.id = TREAD;
|
|
msg.params.tread.fid = fid;
|
|
msg.params.tread.offset = offset;
|
|
msg.params.tread.count = count;
|
|
errorno = v9fs_mux_rpc(v9ses, &msg, &rc);
|
|
|
|
if (!errorno) {
|
|
errorno = rc->params.rread.count;
|
|
dump_data(rc->params.rread.data, rc->params.rread.count);
|
|
}
|
|
|
|
if (fcall)
|
|
*fcall = rc;
|
|
else
|
|
kfree(rc);
|
|
|
|
return errorno;
|
|
}
|
|
|
|
/**
|
|
* 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, void *data, struct v9fs_fcall **fcall)
|
|
{
|
|
struct v9fs_fcall msg;
|
|
struct v9fs_fcall *rc = NULL;
|
|
long errorno = -1;
|
|
|
|
dprintk(DEBUG_9P, "fid %d offset 0x%llx count 0x%x\n", fid,
|
|
(unsigned long long)offset, count);
|
|
dump_data(data, count);
|
|
|
|
msg.id = TWRITE;
|
|
msg.params.twrite.fid = fid;
|
|
msg.params.twrite.offset = offset;
|
|
msg.params.twrite.count = count;
|
|
msg.params.twrite.data = data;
|
|
|
|
errorno = v9fs_mux_rpc(v9ses, &msg, &rc);
|
|
|
|
if (!errorno)
|
|
errorno = rc->params.rwrite.count;
|
|
|
|
if (fcall)
|
|
*fcall = rc;
|
|
else
|
|
kfree(rc);
|
|
|
|
return errorno;
|
|
}
|