428 lines
8.7 KiB
C
428 lines
8.7 KiB
C
/*
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* linux/fs/9p/fcall.c
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*
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* This file contains functions to perform synchronous 9P calls
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*
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* Copyright (C) 2004 by Latchesar Ionkov <lucho@ionkov.net>
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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 version 2
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* as published by the Free Software Foundation.
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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/module.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/sched.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 "conv.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 **rcp)
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{
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int ret;
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struct v9fs_fcall *tc;
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dprintk(DEBUG_9P, "msize: %d version: %s\n", msize, version);
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tc = v9fs_create_tversion(msize, version);
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if (!IS_ERR(tc)) {
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ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
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kfree(tc);
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} else
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ret = PTR_ERR(tc);
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return ret;
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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 **rcp)
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{
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int ret;
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struct v9fs_fcall* tc;
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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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tc = v9fs_create_tattach(fid, afid, uname, aname);
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if (!IS_ERR(tc)) {
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ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
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kfree(tc);
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} else
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ret = PTR_ERR(tc);
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return ret;
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}
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static void v9fs_t_clunk_cb(void *a, struct v9fs_fcall *tc,
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struct v9fs_fcall *rc, int err)
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{
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int fid, id;
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struct v9fs_session_info *v9ses;
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id = 0;
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fid = tc->params.tclunk.fid;
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if (rc)
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id = rc->id;
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kfree(tc);
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kfree(rc);
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if (id == RCLUNK) {
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v9ses = a;
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v9fs_put_idpool(fid, &v9ses->fidpool);
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}
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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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{
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int ret;
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struct v9fs_fcall *tc, *rc;
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dprintk(DEBUG_9P, "fid %d\n", fid);
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rc = NULL;
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tc = v9fs_create_tclunk(fid);
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if (!IS_ERR(tc))
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ret = v9fs_mux_rpc(v9ses->mux, tc, &rc);
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else
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ret = PTR_ERR(tc);
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if (ret)
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dprintk(DEBUG_ERROR, "failed fid %d err %d\n", fid, ret);
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v9fs_t_clunk_cb(v9ses, tc, rc, ret);
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return ret;
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}
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#if 0
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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: tag to release
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*
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*/
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int v9fs_t_flush(struct v9fs_session_info *v9ses, u16 oldtag)
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{
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int ret;
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struct v9fs_fcall *tc;
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dprintk(DEBUG_9P, "oldtag %d\n", oldtag);
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tc = v9fs_create_tflush(oldtag);
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if (!IS_ERR(tc)) {
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ret = v9fs_mux_rpc(v9ses->mux, tc, NULL);
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kfree(tc);
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} else
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ret = PTR_ERR(tc);
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return ret;
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}
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#endif
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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 **rcp)
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{
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int ret;
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struct v9fs_fcall *tc;
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dprintk(DEBUG_9P, "fid %d\n", fid);
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ret = -ENOMEM;
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tc = v9fs_create_tstat(fid);
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if (!IS_ERR(tc)) {
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ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
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kfree(tc);
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} else
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ret = PTR_ERR(tc);
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return ret;
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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_wstat *wstat, struct v9fs_fcall **rcp)
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{
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int ret;
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struct v9fs_fcall *tc;
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dprintk(DEBUG_9P, "fid %d\n", fid);
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tc = v9fs_create_twstat(fid, wstat, v9ses->extended);
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if (!IS_ERR(tc)) {
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ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
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kfree(tc);
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} else
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ret = PTR_ERR(tc);
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return ret;
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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 **rcp)
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{
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int ret;
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struct v9fs_fcall *tc;
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int nwname;
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dprintk(DEBUG_9P, "fid %d newfid %d wname '%s'\n", fid, newfid, name);
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if (name)
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nwname = 1;
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else
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nwname = 0;
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tc = v9fs_create_twalk(fid, newfid, nwname, &name);
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if (!IS_ERR(tc)) {
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ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
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kfree(tc);
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} else
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ret = PTR_ERR(tc);
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return ret;
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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 **rcp)
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{
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int ret;
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struct v9fs_fcall *tc;
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dprintk(DEBUG_9P, "fid %d mode %d\n", fid, mode);
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tc = v9fs_create_topen(fid, mode);
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if (!IS_ERR(tc)) {
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ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
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kfree(tc);
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} else
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ret = PTR_ERR(tc);
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return ret;
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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 **rcp)
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{
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int ret;
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struct v9fs_fcall *tc;
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dprintk(DEBUG_9P, "fid %d\n", fid);
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tc = v9fs_create_tremove(fid);
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if (!IS_ERR(tc)) {
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ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
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kfree(tc);
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} else
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ret = PTR_ERR(tc);
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return ret;
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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, u32 perm,
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u8 mode, char *extension, struct v9fs_fcall **rcp)
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{
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int ret;
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struct v9fs_fcall *tc;
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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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tc = v9fs_create_tcreate(fid, name, perm, mode, extension,
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v9ses->extended);
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if (!IS_ERR(tc)) {
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ret = v9fs_mux_rpc(v9ses->mux, tc, rcp);
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kfree(tc);
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} else
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ret = PTR_ERR(tc);
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return ret;
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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 **rcp)
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{
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int ret;
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struct v9fs_fcall *tc, *rc;
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dprintk(DEBUG_9P, "fid %d offset 0x%llux count 0x%x\n", fid,
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(long long unsigned) offset, count);
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tc = v9fs_create_tread(fid, offset, count);
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if (!IS_ERR(tc)) {
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ret = v9fs_mux_rpc(v9ses->mux, tc, &rc);
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if (!ret)
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ret = rc->params.rread.count;
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if (rcp)
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*rcp = rc;
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else
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kfree(rc);
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kfree(tc);
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} else
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ret = PTR_ERR(tc);
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return ret;
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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, u64 offset, u32 count,
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const char __user *data, struct v9fs_fcall **rcp)
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{
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int ret;
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struct v9fs_fcall *tc, *rc;
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dprintk(DEBUG_9P, "fid %d offset 0x%llux count 0x%x\n", fid,
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(long long unsigned) offset, count);
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tc = v9fs_create_twrite(fid, offset, count, data);
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if (!IS_ERR(tc)) {
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ret = v9fs_mux_rpc(v9ses->mux, tc, &rc);
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if (!ret)
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ret = rc->params.rwrite.count;
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if (rcp)
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*rcp = rc;
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else
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kfree(rc);
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kfree(tc);
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} else
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ret = PTR_ERR(tc);
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return ret;
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}
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