b8cf945b31
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>
360 lines
8.1 KiB
C
360 lines
8.1 KiB
C
/*
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* linux/fs/9p/9p.c
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*
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* This file contains functions 9P2000 functions
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*
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* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to:
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* Free Software Foundation
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02111-1301 USA
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*
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/idr.h>
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#include "debug.h"
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#include "v9fs.h"
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#include "9p.h"
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#include "mux.h"
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/**
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* v9fs_t_version - negotiate protocol parameters with sever
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* @v9ses: 9P2000 session information
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* @msize: requested max size packet
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* @version: requested version.extension string
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* @fcall: pointer to response fcall pointer
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*
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*/
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int
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v9fs_t_version(struct v9fs_session_info *v9ses, u32 msize,
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char *version, struct v9fs_fcall **fcall)
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{
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struct v9fs_fcall msg;
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dprintk(DEBUG_9P, "msize: %d version: %s\n", msize, version);
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msg.id = TVERSION;
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msg.params.tversion.msize = msize;
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msg.params.tversion.version = version;
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return v9fs_mux_rpc(v9ses, &msg, fcall);
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}
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/**
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* v9fs_t_attach - mount the server
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* @v9ses: 9P2000 session information
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* @uname: user name doing the attach
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* @aname: remote name being attached to
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* @fid: mount fid to attatch to root node
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* @afid: authentication fid (in this case result key)
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* @fcall: pointer to response fcall pointer
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*
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*/
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int
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v9fs_t_attach(struct v9fs_session_info *v9ses, char *uname, char *aname,
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u32 fid, u32 afid, struct v9fs_fcall **fcall)
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{
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struct v9fs_fcall msg;
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dprintk(DEBUG_9P, "uname '%s' aname '%s' fid %d afid %d\n", uname,
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aname, fid, afid);
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msg.id = TATTACH;
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msg.params.tattach.fid = fid;
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msg.params.tattach.afid = afid;
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msg.params.tattach.uname = uname;
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msg.params.tattach.aname = aname;
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return v9fs_mux_rpc(v9ses, &msg, fcall);
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}
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/**
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* v9fs_t_clunk - release a fid (finish a transaction)
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* @v9ses: 9P2000 session information
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* @fid: fid to release
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* @fcall: pointer to response fcall pointer
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*
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*/
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int
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v9fs_t_clunk(struct v9fs_session_info *v9ses, u32 fid,
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struct v9fs_fcall **fcall)
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{
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struct v9fs_fcall msg;
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dprintk(DEBUG_9P, "fid %d\n", fid);
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msg.id = TCLUNK;
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msg.params.tclunk.fid = fid;
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return v9fs_mux_rpc(v9ses, &msg, fcall);
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}
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/**
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* v9fs_v9fs_t_flush - flush a pending transaction
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* @v9ses: 9P2000 session information
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* @tag: tid to release
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*
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*/
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int v9fs_t_flush(struct v9fs_session_info *v9ses, u16 tag)
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{
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struct v9fs_fcall msg;
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dprintk(DEBUG_9P, "oldtag %d\n", tag);
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msg.id = TFLUSH;
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msg.params.tflush.oldtag = tag;
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return v9fs_mux_rpc(v9ses, &msg, NULL);
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}
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/**
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* v9fs_t_stat - read a file's meta-data
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* @v9ses: 9P2000 session information
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* @fid: fid pointing to file or directory to get info about
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* @fcall: pointer to response fcall
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*
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*/
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int
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v9fs_t_stat(struct v9fs_session_info *v9ses, u32 fid, struct v9fs_fcall **fcall)
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{
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struct v9fs_fcall msg;
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dprintk(DEBUG_9P, "fid %d\n", fid);
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if (fcall)
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*fcall = NULL;
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msg.id = TSTAT;
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msg.params.tstat.fid = fid;
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return v9fs_mux_rpc(v9ses, &msg, fcall);
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}
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/**
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* v9fs_t_wstat - write a file's meta-data
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* @v9ses: 9P2000 session information
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* @fid: fid pointing to file or directory to write info about
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* @stat: metadata
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* @fcall: pointer to response fcall
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*
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*/
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int
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v9fs_t_wstat(struct v9fs_session_info *v9ses, u32 fid,
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struct v9fs_stat *stat, struct v9fs_fcall **fcall)
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{
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struct v9fs_fcall msg;
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dprintk(DEBUG_9P, "fid %d length %d\n", fid, (int)stat->length);
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msg.id = TWSTAT;
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msg.params.twstat.fid = fid;
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msg.params.twstat.stat = stat;
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return v9fs_mux_rpc(v9ses, &msg, fcall);
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}
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/**
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* v9fs_t_walk - walk a fid to a new file or directory
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* @v9ses: 9P2000 session information
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* @fid: fid to walk
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* @newfid: new fid (for clone operations)
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* @name: path to walk fid to
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* @fcall: pointer to response fcall
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*
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*/
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/* TODO: support multiple walk */
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int
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v9fs_t_walk(struct v9fs_session_info *v9ses, u32 fid, u32 newfid,
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char *name, struct v9fs_fcall **fcall)
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{
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struct v9fs_fcall msg;
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dprintk(DEBUG_9P, "fid %d newfid %d wname '%s'\n", fid, newfid, name);
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msg.id = TWALK;
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msg.params.twalk.fid = fid;
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msg.params.twalk.newfid = newfid;
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if (name) {
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msg.params.twalk.nwname = 1;
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msg.params.twalk.wnames = &name;
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} else {
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msg.params.twalk.nwname = 0;
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}
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return v9fs_mux_rpc(v9ses, &msg, fcall);
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}
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/**
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* v9fs_t_open - open a file
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*
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* @v9ses - 9P2000 session information
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* @fid - fid to open
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* @mode - mode to open file (R, RW, etc)
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* @fcall - pointer to response fcall
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*
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*/
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int
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v9fs_t_open(struct v9fs_session_info *v9ses, u32 fid, u8 mode,
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struct v9fs_fcall **fcall)
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{
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struct v9fs_fcall msg;
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long errorno = -1;
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dprintk(DEBUG_9P, "fid %d mode %d\n", fid, mode);
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msg.id = TOPEN;
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msg.params.topen.fid = fid;
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msg.params.topen.mode = mode;
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errorno = v9fs_mux_rpc(v9ses, &msg, fcall);
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return errorno;
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}
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/**
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* v9fs_t_remove - remove a file or directory
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* @v9ses: 9P2000 session information
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* @fid: fid to remove
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* @fcall: pointer to response fcall
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*
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*/
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int
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v9fs_t_remove(struct v9fs_session_info *v9ses, u32 fid,
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struct v9fs_fcall **fcall)
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{
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struct v9fs_fcall msg;
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dprintk(DEBUG_9P, "fid %d\n", fid);
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msg.id = TREMOVE;
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msg.params.tremove.fid = fid;
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return v9fs_mux_rpc(v9ses, &msg, fcall);
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}
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/**
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* v9fs_t_create - create a file or directory
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* @v9ses: 9P2000 session information
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* @fid: fid to create
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* @name: name of the file or directory to create
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* @perm: permissions to create with
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* @mode: mode to open file (R, RW, etc)
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* @fcall: pointer to response fcall
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*
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*/
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int
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v9fs_t_create(struct v9fs_session_info *v9ses, u32 fid, char *name,
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u32 perm, u8 mode, struct v9fs_fcall **fcall)
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{
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struct v9fs_fcall msg;
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dprintk(DEBUG_9P, "fid %d name '%s' perm %x mode %d\n",
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fid, name, perm, mode);
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msg.id = TCREATE;
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msg.params.tcreate.fid = fid;
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msg.params.tcreate.name = name;
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msg.params.tcreate.perm = perm;
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msg.params.tcreate.mode = mode;
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return v9fs_mux_rpc(v9ses, &msg, fcall);
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}
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/**
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* v9fs_t_read - read data
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* @v9ses: 9P2000 session information
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* @fid: fid to read from
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* @offset: offset to start read at
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* @count: how many bytes to read
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* @fcall: pointer to response fcall (with data)
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*
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*/
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int
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v9fs_t_read(struct v9fs_session_info *v9ses, u32 fid, u64 offset,
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u32 count, struct v9fs_fcall **fcall)
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{
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struct v9fs_fcall msg;
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struct v9fs_fcall *rc = NULL;
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long errorno = -1;
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dprintk(DEBUG_9P, "fid %d offset 0x%lx count 0x%x\n", fid,
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(long unsigned int)offset, count);
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msg.id = TREAD;
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msg.params.tread.fid = fid;
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msg.params.tread.offset = offset;
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msg.params.tread.count = count;
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errorno = v9fs_mux_rpc(v9ses, &msg, &rc);
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if (!errorno) {
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errorno = rc->params.rread.count;
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dump_data(rc->params.rread.data, rc->params.rread.count);
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}
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if (fcall)
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*fcall = rc;
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else
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kfree(rc);
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return errorno;
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}
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/**
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* v9fs_t_write - write data
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* @v9ses: 9P2000 session information
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* @fid: fid to write to
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* @offset: offset to start write at
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* @count: how many bytes to write
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* @fcall: pointer to response fcall
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*
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*/
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int
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v9fs_t_write(struct v9fs_session_info *v9ses, u32 fid,
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u64 offset, u32 count, void *data, struct v9fs_fcall **fcall)
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{
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struct v9fs_fcall msg;
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struct v9fs_fcall *rc = NULL;
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long errorno = -1;
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dprintk(DEBUG_9P, "fid %d offset 0x%llx count 0x%x\n", fid,
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(unsigned long long)offset, count);
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dump_data(data, count);
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msg.id = TWRITE;
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msg.params.twrite.fid = fid;
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msg.params.twrite.offset = offset;
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msg.params.twrite.count = count;
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msg.params.twrite.data = data;
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errorno = v9fs_mux_rpc(v9ses, &msg, &rc);
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if (!errorno)
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errorno = rc->params.rwrite.count;
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if (fcall)
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*fcall = rc;
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else
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kfree(rc);
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return errorno;
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}
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