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[PATCH] v9fs: transport modules
This part of the patch contains transport routines. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com> Signed-off-by: Latchesar Ionkov <lucho@ionkov.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Eric Van Hensbergen
Linus Torvalds
parent
b8cf945b31
commit
426cc91aa6
440
fs/9p/mux.c
Normal file
440
fs/9p/mux.c
Normal file
@ -0,0 +1,440 @@
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/*
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* linux/fs/9p/mux.c
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*
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* Protocol Multiplexer
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*
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* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 2004 by Latchesar Ionkov <lucho@ionkov.net>
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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/kthread.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 "transport.h"
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#include "conv.h"
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#include "mux.h"
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/**
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* dprintcond - print condition of session info
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* @v9ses: session info structure
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* @req: RPC request structure
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*
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*/
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static inline int
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dprintcond(struct v9fs_session_info *v9ses, struct v9fs_rpcreq *req)
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{
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dprintk(DEBUG_MUX, "condition: %d, %p\n", v9ses->transport->status,
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req->rcall);
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return 0;
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}
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/**
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* xread - force read of a certain number of bytes
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* @v9ses: session info structure
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* @ptr: pointer to buffer
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* @sz: number of bytes to read
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*
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* Chuck Cranor CS-533 project1
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*/
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static int xread(struct v9fs_session_info *v9ses, void *ptr, unsigned long sz)
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{
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int rd = 0;
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int ret = 0;
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while (rd < sz) {
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ret = v9ses->transport->read(v9ses->transport, ptr, sz - rd);
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if (ret <= 0) {
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dprintk(DEBUG_ERROR, "xread errno %d\n", ret);
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return ret;
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}
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rd += ret;
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ptr += ret;
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}
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return (rd);
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}
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/**
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* read_message - read a full 9P2000 fcall packet
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* @v9ses: session info structure
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* @rcall: fcall structure to read into
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* @rcalllen: size of fcall buffer
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*
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*/
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static int
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read_message(struct v9fs_session_info *v9ses,
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struct v9fs_fcall *rcall, int rcalllen)
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{
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unsigned char buf[4];
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void *data;
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int size = 0;
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int res = 0;
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res = xread(v9ses, buf, sizeof(buf));
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if (res < 0) {
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dprintk(DEBUG_ERROR,
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"Reading of count field failed returned: %d\n", res);
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return res;
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}
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if (res < 4) {
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dprintk(DEBUG_ERROR,
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"Reading of count field failed returned: %d\n", res);
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return -EIO;
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}
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size = buf[0] | (buf[1] << 8) | (buf[2] << 16) | (buf[3] << 24);
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dprintk(DEBUG_MUX, "got a packet count: %d\n", size);
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/* adjust for the four bytes of size */
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size -= 4;
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if (size > v9ses->maxdata) {
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dprintk(DEBUG_ERROR, "packet too big: %d\n", size);
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return -E2BIG;
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}
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data = kmalloc(size, GFP_KERNEL);
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if (!data) {
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eprintk(KERN_WARNING, "out of memory\n");
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return -ENOMEM;
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}
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res = xread(v9ses, data, size);
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if (res < size) {
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dprintk(DEBUG_ERROR, "Reading of fcall failed returned: %d\n",
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res);
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kfree(data);
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return res;
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}
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/* we now have an in-memory string that is the reply.
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* deserialize it. There is very little to go wrong at this point
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* save for v9fs_alloc errors.
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*/
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res = v9fs_deserialize_fcall(v9ses, size, data, v9ses->maxdata,
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rcall, rcalllen);
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kfree(data);
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if (res < 0)
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return res;
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return 0;
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}
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/**
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* v9fs_recv - receive an RPC response for a particular tag
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* @v9ses: session info structure
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* @req: RPC request structure
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*
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*/
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static int v9fs_recv(struct v9fs_session_info *v9ses, struct v9fs_rpcreq *req)
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{
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int ret = 0;
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dprintk(DEBUG_MUX, "waiting for response: %d\n", req->tcall->tag);
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ret = wait_event_interruptible(v9ses->read_wait,
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((v9ses->transport->status != Connected) ||
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(req->rcall != 0) || dprintcond(v9ses, req)));
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dprintk(DEBUG_MUX, "got it: rcall %p\n", req->rcall);
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if (v9ses->transport->status == Disconnected)
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return -ECONNRESET;
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if (ret == 0) {
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spin_lock(&v9ses->muxlock);
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list_del(&req->next);
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spin_unlock(&v9ses->muxlock);
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}
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return ret;
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}
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/**
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* v9fs_send - send a 9P request
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* @v9ses: session info structure
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* @req: RPC request to send
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*
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*/
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static int v9fs_send(struct v9fs_session_info *v9ses, struct v9fs_rpcreq *req)
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{
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int ret = -1;
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void *data = NULL;
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struct v9fs_fcall *tcall = req->tcall;
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data = kmalloc(v9ses->maxdata + V9FS_IOHDRSZ, GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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tcall->size = 0; /* enforce size recalculation */
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ret =
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v9fs_serialize_fcall(v9ses, tcall, data,
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v9ses->maxdata + V9FS_IOHDRSZ);
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if (ret < 0)
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goto free_data;
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spin_lock(&v9ses->muxlock);
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list_add(&req->next, &v9ses->mux_fcalls);
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spin_unlock(&v9ses->muxlock);
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dprintk(DEBUG_MUX, "sending message: tag %d size %d\n", tcall->tag,
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tcall->size);
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ret = v9ses->transport->write(v9ses->transport, data, tcall->size);
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if (ret != tcall->size) {
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spin_lock(&v9ses->muxlock);
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list_del(&req->next);
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kfree(req->rcall);
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spin_unlock(&v9ses->muxlock);
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if (ret >= 0)
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ret = -EREMOTEIO;
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} else
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ret = 0;
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free_data:
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kfree(data);
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return ret;
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}
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/**
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* v9fs_mux_rpc - send a request, receive a response
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* @v9ses: session info structure
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* @tcall: fcall to send
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* @rcall: buffer to place response into
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*
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*/
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long
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v9fs_mux_rpc(struct v9fs_session_info *v9ses, struct v9fs_fcall *tcall,
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struct v9fs_fcall **rcall)
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{
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int tid = -1;
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struct v9fs_fcall *fcall = NULL;
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struct v9fs_rpcreq req;
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int ret = -1;
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if (!v9ses)
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return -EINVAL;
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if (rcall)
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*rcall = NULL;
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if (tcall->id != TVERSION) {
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tid = v9fs_get_idpool(&v9ses->tidpool);
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if (tid < 0)
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return -ENOMEM;
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}
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tcall->tag = tid;
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req.tcall = tcall;
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req.rcall = NULL;
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ret = v9fs_send(v9ses, &req);
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if (ret < 0) {
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if (tcall->id != TVERSION)
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v9fs_put_idpool(tid, &v9ses->tidpool);
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dprintk(DEBUG_MUX, "error %d\n", ret);
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return ret;
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}
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ret = v9fs_recv(v9ses, &req);
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fcall = req.rcall;
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dprintk(DEBUG_MUX, "received: tag=%x, ret=%d\n", tcall->tag, ret);
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if (ret == -ERESTARTSYS) {
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if (v9ses->transport->status != Disconnected
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&& tcall->id != TFLUSH) {
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unsigned long flags;
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dprintk(DEBUG_MUX, "flushing the tag: %d\n",
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tcall->tag);
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clear_thread_flag(TIF_SIGPENDING);
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v9fs_t_flush(v9ses, tcall->tag);
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spin_lock_irqsave(¤t->sighand->siglock, flags);
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recalc_sigpending();
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spin_unlock_irqrestore(¤t->sighand->siglock,
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flags);
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dprintk(DEBUG_MUX, "flushing done\n");
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}
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goto release_req;
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} else if (ret < 0)
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goto release_req;
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if (!fcall)
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ret = -EIO;
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else {
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if (fcall->id == RERROR) {
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ret = v9fs_errstr2errno(fcall->params.rerror.error);
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if (ret == 0) { /* string match failed */
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if (fcall->params.rerror.errno)
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ret = -(fcall->params.rerror.errno);
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else
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ret = -ESERVERFAULT;
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}
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} else if (fcall->id != tcall->id + 1) {
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dprintk(DEBUG_ERROR,
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"fcall mismatch: expected %d, got %d\n",
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tcall->id + 1, fcall->id);
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ret = -EIO;
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}
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}
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release_req:
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if (tcall->id != TVERSION)
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v9fs_put_idpool(tid, &v9ses->tidpool);
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if (rcall)
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*rcall = fcall;
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else
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kfree(fcall);
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return ret;
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}
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/**
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* v9fs_recvproc - kproc to handle demultiplexing responses
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* @data: session info structure
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*
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*/
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static int v9fs_recvproc(void *data)
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{
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struct v9fs_session_info *v9ses = (struct v9fs_session_info *)data;
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struct v9fs_fcall *rcall = NULL;
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struct v9fs_rpcreq *rptr;
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struct v9fs_rpcreq *req;
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struct v9fs_rpcreq *rreq;
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int err = 0;
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allow_signal(SIGKILL);
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set_current_state(TASK_INTERRUPTIBLE);
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complete(&v9ses->proccmpl);
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while (!kthread_should_stop() && err >= 0) {
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req = rptr = rreq = NULL;
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rcall = kmalloc(v9ses->maxdata + V9FS_IOHDRSZ, GFP_KERNEL);
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if (!rcall) {
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eprintk(KERN_ERR, "no memory for buffers\n");
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break;
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}
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err = read_message(v9ses, rcall, v9ses->maxdata + V9FS_IOHDRSZ);
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if (err < 0) {
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kfree(rcall);
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break;
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}
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spin_lock(&v9ses->muxlock);
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list_for_each_entry_safe(rreq, rptr, &v9ses->mux_fcalls, next) {
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if (rreq->tcall->tag == rcall->tag) {
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req = rreq;
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req->rcall = rcall;
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break;
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}
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}
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if (req && (req->tcall->id == TFLUSH)) {
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struct v9fs_rpcreq *treq = NULL;
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list_for_each_entry_safe(treq, rptr, &v9ses->mux_fcalls, next) {
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if (treq->tcall->tag ==
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req->tcall->params.tflush.oldtag) {
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list_del(&rptr->next);
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kfree(treq->rcall);
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break;
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}
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}
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}
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spin_unlock(&v9ses->muxlock);
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if (!req) {
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dprintk(DEBUG_ERROR,
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"unexpected response: id %d tag %d\n",
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rcall->id, rcall->tag);
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kfree(rcall);
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}
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wake_up_all(&v9ses->read_wait);
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set_current_state(TASK_INTERRUPTIBLE);
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}
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/* Inform all pending processes about the failure */
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wake_up_all(&v9ses->read_wait);
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if (signal_pending(current))
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complete(&v9ses->proccmpl);
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dprintk(DEBUG_MUX, "recvproc: end\n");
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v9ses->recvproc = NULL;
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return err >= 0;
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}
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/**
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* v9fs_mux_init - initialize multiplexer (spawn kproc)
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* @v9ses: session info structure
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* @dev_name: mount device information (to create unique kproc)
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*
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*/
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int v9fs_mux_init(struct v9fs_session_info *v9ses, const char *dev_name)
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{
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char procname[60];
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strncpy(procname, dev_name, sizeof(procname));
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procname[sizeof(procname) - 1] = 0;
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init_waitqueue_head(&v9ses->read_wait);
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init_completion(&v9ses->fcread);
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init_completion(&v9ses->proccmpl);
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spin_lock_init(&v9ses->muxlock);
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INIT_LIST_HEAD(&v9ses->mux_fcalls);
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v9ses->recvproc = NULL;
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v9ses->curfcall = NULL;
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v9ses->recvproc = kthread_create(v9fs_recvproc, v9ses,
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"v9fs_recvproc %s", procname);
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if (IS_ERR(v9ses->recvproc)) {
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eprintk(KERN_ERR, "cannot create receiving thread\n");
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v9fs_session_close(v9ses);
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return -ECONNABORTED;
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}
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wake_up_process(v9ses->recvproc);
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wait_for_completion(&v9ses->proccmpl);
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return 0;
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}
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39
fs/9p/mux.h
Normal file
39
fs/9p/mux.h
Normal file
@ -0,0 +1,39 @@
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/*
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* linux/fs/9p/mux.h
|
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*
|
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* Multiplexer Definitions
|
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*
|
||||
* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
|
||||
*
|
||||
* 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
|
||||
*
|
||||
*/
|
||||
|
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/* structure to manage each RPC transaction */
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|
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struct v9fs_rpcreq {
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struct v9fs_fcall *tcall;
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struct v9fs_fcall *rcall;
|
||||
|
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/* XXX - could we put scatter/gather buffers here? */
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struct list_head next;
|
||||
};
|
||||
|
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int v9fs_mux_init(struct v9fs_session_info *v9ses, const char *dev_name);
|
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long v9fs_mux_rpc(struct v9fs_session_info *v9ses,
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struct v9fs_fcall *tcall, struct v9fs_fcall **rcall);
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172
fs/9p/trans_fd.c
Normal file
172
fs/9p/trans_fd.c
Normal file
@ -0,0 +1,172 @@
|
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/*
|
||||
* linux/fs/9p/trans_fd.c
|
||||
*
|
||||
* File Descriptor Transport Layer
|
||||
*
|
||||
* Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com>
|
||||
*
|
||||
* 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/net.h>
|
||||
#include <linux/ipv6.h>
|
||||
#include <linux/errno.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/un.h>
|
||||
#include <asm/uaccess.h>
|
||||
#include <linux/inet.h>
|
||||
#include <linux/idr.h>
|
||||
#include <linux/file.h>
|
||||
|
||||
#include "debug.h"
|
||||
#include "v9fs.h"
|
||||
#include "transport.h"
|
||||
|
||||
struct v9fs_trans_fd {
|
||||
struct file *in_file;
|
||||
struct file *out_file;
|
||||
};
|
||||
|
||||
/**
|
||||
* v9fs_fd_recv - receive from a socket
|
||||
* @v9ses: session information
|
||||
* @v: buffer to receive data into
|
||||
* @len: size of receive buffer
|
||||
*
|
||||
*/
|
||||
|
||||
static int v9fs_fd_recv(struct v9fs_transport *trans, void *v, int len)
|
||||
{
|
||||
struct v9fs_trans_fd *ts = trans ? trans->priv : NULL;
|
||||
|
||||
if (!trans || trans->status != Connected || !ts)
|
||||
return -EIO;
|
||||
|
||||
return kernel_read(ts->in_file, ts->in_file->f_pos, v, len);
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_fd_send - send to a socket
|
||||
* @v9ses: session information
|
||||
* @v: buffer to send data from
|
||||
* @len: size of send buffer
|
||||
*
|
||||
*/
|
||||
|
||||
static int v9fs_fd_send(struct v9fs_transport *trans, void *v, int len)
|
||||
{
|
||||
struct v9fs_trans_fd *ts = trans ? trans->priv : NULL;
|
||||
mm_segment_t oldfs = get_fs();
|
||||
int ret = 0;
|
||||
|
||||
if (!trans || trans->status != Connected || !ts)
|
||||
return -EIO;
|
||||
|
||||
set_fs(get_ds());
|
||||
/* The cast to a user pointer is valid due to the set_fs() */
|
||||
ret = vfs_write(ts->out_file, (void __user *)v, len, &ts->out_file->f_pos);
|
||||
set_fs(oldfs);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_fd_init - initialize file descriptor transport
|
||||
* @v9ses: session information
|
||||
* @addr: address of server to mount
|
||||
* @data: mount options
|
||||
*
|
||||
*/
|
||||
|
||||
static int
|
||||
v9fs_fd_init(struct v9fs_session_info *v9ses, const char *addr, char *data)
|
||||
{
|
||||
struct v9fs_trans_fd *ts = NULL;
|
||||
struct v9fs_transport *trans = v9ses->transport;
|
||||
|
||||
if((v9ses->wfdno == ~0) || (v9ses->rfdno == ~0)) {
|
||||
printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
|
||||
return -ENOPROTOOPT;
|
||||
}
|
||||
|
||||
sema_init(&trans->writelock, 1);
|
||||
sema_init(&trans->readlock, 1);
|
||||
|
||||
ts = kmalloc(sizeof(struct v9fs_trans_fd), GFP_KERNEL);
|
||||
|
||||
if (!ts)
|
||||
return -ENOMEM;
|
||||
|
||||
ts->in_file = fget( v9ses->rfdno );
|
||||
ts->out_file = fget( v9ses->wfdno );
|
||||
|
||||
if (!ts->in_file || !ts->out_file) {
|
||||
if (ts->in_file)
|
||||
fput(ts->in_file);
|
||||
|
||||
if (ts->out_file)
|
||||
fput(ts->out_file);
|
||||
|
||||
kfree(ts);
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
trans->priv = ts;
|
||||
trans->status = Connected;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* v9fs_fd_close - shutdown file descriptor
|
||||
* @trans: private socket structure
|
||||
*
|
||||
*/
|
||||
|
||||
static void v9fs_fd_close(struct v9fs_transport *trans)
|
||||
{
|
||||
struct v9fs_trans_fd *ts;
|
||||
|
||||
if (!trans)
|
||||
return;
|
||||
|
||||
trans->status = Disconnected;
|
||||
ts = trans->priv;
|
||||
|
||||
if (!ts)
|
||||
return;
|
||||
|
||||
if (ts->in_file)
|
||||
fput(ts->in_file);
|
||||
|
||||
if (ts->out_file)
|
||||
fput(ts->out_file);
|
||||
|
||||
kfree(ts);
|
||||
}
|
||||
|
||||
struct v9fs_transport v9fs_trans_fd = {
|
||||
.init = v9fs_fd_init,
|
||||
.write = v9fs_fd_send,
|
||||
.read = v9fs_fd_recv,
|
||||
.close = v9fs_fd_close,
|
||||
};
|
||||
|
||||
282
fs/9p/trans_sock.c
Normal file
282
fs/9p/trans_sock.c
Normal file
@ -0,0 +1,282 @@
|
||||
/*
|
||||
* linux/fs/9p/trans_socket.c
|
||||
*
|
||||
* Socket Transport Layer
|
||||
*
|
||||
* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
|
||||
* Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com>
|
||||
* Copyright (C) 1995, 1996 by Olaf Kirch <okir@monad.swb.de>
|
||||
*
|
||||
* 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/net.h>
|
||||
#include <linux/ipv6.h>
|
||||
#include <linux/errno.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/un.h>
|
||||
#include <asm/uaccess.h>
|
||||
#include <linux/inet.h>
|
||||
#include <linux/idr.h>
|
||||
|
||||
#include "debug.h"
|
||||
#include "v9fs.h"
|
||||
#include "transport.h"
|
||||
|
||||
#define V9FS_PORT 564
|
||||
|
||||
struct v9fs_trans_sock {
|
||||
struct socket *s;
|
||||
};
|
||||
|
||||
/**
|
||||
* v9fs_sock_recv - receive from a socket
|
||||
* @v9ses: session information
|
||||
* @v: buffer to receive data into
|
||||
* @len: size of receive buffer
|
||||
*
|
||||
*/
|
||||
|
||||
static int v9fs_sock_recv(struct v9fs_transport *trans, void *v, int len)
|
||||
{
|
||||
struct msghdr msg;
|
||||
struct kvec iov;
|
||||
int result;
|
||||
mm_segment_t oldfs;
|
||||
struct v9fs_trans_sock *ts = trans ? trans->priv : NULL;
|
||||
|
||||
if (trans->status == Disconnected)
|
||||
return -EREMOTEIO;
|
||||
|
||||
result = -EINVAL;
|
||||
|
||||
oldfs = get_fs();
|
||||
set_fs(get_ds());
|
||||
|
||||
iov.iov_base = v;
|
||||
iov.iov_len = len;
|
||||
msg.msg_name = NULL;
|
||||
msg.msg_namelen = 0;
|
||||
msg.msg_iovlen = 1;
|
||||
msg.msg_control = NULL;
|
||||
msg.msg_controllen = 0;
|
||||
msg.msg_namelen = 0;
|
||||
msg.msg_flags = MSG_NOSIGNAL;
|
||||
|
||||
result = kernel_recvmsg(ts->s, &msg, &iov, 1, len, 0);
|
||||
|
||||
dprintk(DEBUG_TRANS, "socket state %d\n", ts->s->state);
|
||||
set_fs(oldfs);
|
||||
|
||||
if (result <= 0) {
|
||||
if (result != -ERESTARTSYS)
|
||||
trans->status = Disconnected;
|
||||
}
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_sock_send - send to a socket
|
||||
* @v9ses: session information
|
||||
* @v: buffer to send data from
|
||||
* @len: size of send buffer
|
||||
*
|
||||
*/
|
||||
|
||||
static int v9fs_sock_send(struct v9fs_transport *trans, void *v, int len)
|
||||
{
|
||||
struct kvec iov;
|
||||
struct msghdr msg;
|
||||
int result = -1;
|
||||
mm_segment_t oldfs;
|
||||
struct v9fs_trans_sock *ts = trans ? trans->priv : NULL;
|
||||
|
||||
dprintk(DEBUG_TRANS, "Sending packet size %d (%x)\n", len, len);
|
||||
dump_data(v, len);
|
||||
|
||||
down(&trans->writelock);
|
||||
|
||||
oldfs = get_fs();
|
||||
set_fs(get_ds());
|
||||
iov.iov_base = v;
|
||||
iov.iov_len = len;
|
||||
msg.msg_name = NULL;
|
||||
msg.msg_namelen = 0;
|
||||
msg.msg_iovlen = 1;
|
||||
msg.msg_control = NULL;
|
||||
msg.msg_controllen = 0;
|
||||
msg.msg_namelen = 0;
|
||||
msg.msg_flags = MSG_NOSIGNAL;
|
||||
result = kernel_sendmsg(ts->s, &msg, &iov, 1, len);
|
||||
set_fs(oldfs);
|
||||
|
||||
if (result < 0) {
|
||||
if (result != -ERESTARTSYS)
|
||||
trans->status = Disconnected;
|
||||
}
|
||||
|
||||
up(&trans->writelock);
|
||||
return result;
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_tcp_init - initialize TCP socket
|
||||
* @v9ses: session information
|
||||
* @addr: address of server to mount
|
||||
* @data: mount options
|
||||
*
|
||||
*/
|
||||
|
||||
static int
|
||||
v9fs_tcp_init(struct v9fs_session_info *v9ses, const char *addr, char *data)
|
||||
{
|
||||
struct socket *csocket = NULL;
|
||||
struct sockaddr_in sin_server;
|
||||
int rc = 0;
|
||||
struct v9fs_trans_sock *ts = NULL;
|
||||
struct v9fs_transport *trans = v9ses->transport;
|
||||
|
||||
sema_init(&trans->writelock, 1);
|
||||
sema_init(&trans->readlock, 1);
|
||||
|
||||
ts = kmalloc(sizeof(struct v9fs_trans_sock), GFP_KERNEL);
|
||||
|
||||
if (!ts)
|
||||
return -ENOMEM;
|
||||
|
||||
trans->priv = ts;
|
||||
ts->s = NULL;
|
||||
|
||||
if (!addr)
|
||||
return -EINVAL;
|
||||
|
||||
dprintk(DEBUG_TRANS, "Connecting to %s\n", addr);
|
||||
|
||||
sin_server.sin_family = AF_INET;
|
||||
sin_server.sin_addr.s_addr = in_aton(addr);
|
||||
sin_server.sin_port = htons(v9ses->port);
|
||||
sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket);
|
||||
rc = csocket->ops->connect(csocket,
|
||||
(struct sockaddr *)&sin_server,
|
||||
sizeof(struct sockaddr_in), 0);
|
||||
if (rc < 0) {
|
||||
eprintk(KERN_ERR,
|
||||
"v9fs_trans_tcp: problem connecting socket to %s\n",
|
||||
addr);
|
||||
return rc;
|
||||
}
|
||||
csocket->sk->sk_allocation = GFP_NOIO;
|
||||
ts->s = csocket;
|
||||
trans->status = Connected;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_unix_init - initialize UNIX domain socket
|
||||
* @v9ses: session information
|
||||
* @dev_name: path to named pipe
|
||||
* @data: mount options
|
||||
*
|
||||
*/
|
||||
|
||||
static int
|
||||
v9fs_unix_init(struct v9fs_session_info *v9ses, const char *dev_name,
|
||||
char *data)
|
||||
{
|
||||
int rc;
|
||||
struct socket *csocket;
|
||||
struct sockaddr_un sun_server;
|
||||
struct v9fs_transport *trans;
|
||||
struct v9fs_trans_sock *ts;
|
||||
|
||||
rc = 0;
|
||||
csocket = NULL;
|
||||
trans = v9ses->transport;
|
||||
|
||||
if (strlen(dev_name) > UNIX_PATH_MAX) {
|
||||
eprintk(KERN_ERR, "v9fs_trans_unix: address too long: %s\n",
|
||||
dev_name);
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
ts = kmalloc(sizeof(struct v9fs_trans_sock), GFP_KERNEL);
|
||||
if (!ts)
|
||||
return -ENOMEM;
|
||||
|
||||
trans->priv = ts;
|
||||
ts->s = NULL;
|
||||
|
||||
sema_init(&trans->writelock, 1);
|
||||
sema_init(&trans->readlock, 1);
|
||||
|
||||
sun_server.sun_family = PF_UNIX;
|
||||
strcpy(sun_server.sun_path, dev_name);
|
||||
sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket);
|
||||
rc = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
|
||||
sizeof(struct sockaddr_un) - 1, 0); /* -1 *is* important */
|
||||
if (rc < 0) {
|
||||
eprintk(KERN_ERR,
|
||||
"v9fs_trans_unix: problem connecting socket: %s: %d\n",
|
||||
dev_name, rc);
|
||||
return rc;
|
||||
}
|
||||
csocket->sk->sk_allocation = GFP_NOIO;
|
||||
ts->s = csocket;
|
||||
trans->status = Connected;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* v9fs_sock_close - shutdown socket
|
||||
* @trans: private socket structure
|
||||
*
|
||||
*/
|
||||
|
||||
static void v9fs_sock_close(struct v9fs_transport *trans)
|
||||
{
|
||||
struct v9fs_trans_sock *ts = trans ? trans->priv : NULL;
|
||||
|
||||
if ((ts) && (ts->s)) {
|
||||
dprintk(DEBUG_TRANS, "closing the socket %p\n", ts->s);
|
||||
sock_release(ts->s);
|
||||
ts->s = NULL;
|
||||
trans->status = Disconnected;
|
||||
dprintk(DEBUG_TRANS, "socket closed\n");
|
||||
}
|
||||
|
||||
kfree(ts);
|
||||
}
|
||||
|
||||
struct v9fs_transport v9fs_trans_tcp = {
|
||||
.init = v9fs_tcp_init,
|
||||
.write = v9fs_sock_send,
|
||||
.read = v9fs_sock_recv,
|
||||
.close = v9fs_sock_close,
|
||||
};
|
||||
|
||||
struct v9fs_transport v9fs_trans_unix = {
|
||||
.init = v9fs_unix_init,
|
||||
.write = v9fs_sock_send,
|
||||
.read = v9fs_sock_recv,
|
||||
.close = v9fs_sock_close,
|
||||
};
|
||||
46
fs/9p/transport.h
Normal file
46
fs/9p/transport.h
Normal file
@ -0,0 +1,46 @@
|
||||
/*
|
||||
* linux/fs/9p/transport.h
|
||||
*
|
||||
* Transport Definition
|
||||
*
|
||||
* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
|
||||
*
|
||||
* 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
|
||||
*
|
||||
*/
|
||||
|
||||
enum v9fs_transport_status {
|
||||
Connected,
|
||||
Disconnected,
|
||||
Hung,
|
||||
};
|
||||
|
||||
struct v9fs_transport {
|
||||
enum v9fs_transport_status status;
|
||||
struct semaphore writelock;
|
||||
struct semaphore readlock;
|
||||
void *priv;
|
||||
|
||||
int (*init) (struct v9fs_session_info *, const char *, char *);
|
||||
int (*write) (struct v9fs_transport *, void *, int);
|
||||
int (*read) (struct v9fs_transport *, void *, int);
|
||||
void (*close) (struct v9fs_transport *);
|
||||
};
|
||||
|
||||
extern struct v9fs_transport v9fs_trans_tcp;
|
||||
extern struct v9fs_transport v9fs_trans_unix;
|
||||
extern struct v9fs_transport v9fs_trans_fd;
|
||||
@ -296,11 +296,6 @@ v9fs_session_init(struct v9fs_session_info *v9ses,
|
||||
case PROTO_FD:
|
||||
trans_proto = &v9fs_trans_fd;
|
||||
*v9ses->remotename = 0;
|
||||
if((v9ses->wfdno == ~0) || (v9ses->rfdno == ~0)) {
|
||||
printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
|
||||
retval = -ENOPROTOOPT;
|
||||
goto SessCleanUp;
|
||||
}
|
||||
break;
|
||||
default:
|
||||
printk(KERN_ERR "v9fs: Bad mount protocol %d\n", v9ses->proto);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user