Skip to content

Commit

Permalink
[PATCH] v9fs: 9P protocol implementation
Browse files Browse the repository at this point in the history 
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>
  • Loading branch information
Eric Van Hensbergen authored and Linus Torvalds committed Sep 9, 2005
1 parent 9e82cf6 commit b8cf945
Show file tree
Hide file tree
Showing 4 changed files with 1,429 additions and 0 deletions.
359 changes: 359 additions & 0 deletions fs/9p/9p.c
View file
Original file line number Diff line number Diff line change
@@ -0,0 +1,359 @@
/*
* 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;
}
Loading

0 comments on commit b8cf945

Please sign in to comment.