1341 lines
29 KiB
C
1341 lines
29 KiB
C
/*
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* linux/fs/9p/trans_fd.c
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*
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* Fd transport layer. Includes deprecated socket layer.
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*
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* Copyright (C) 2006 by Russ Cox <rsc@swtch.com>
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* Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net>
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* Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com>
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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/in.h>
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#include <linux/module.h>
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#include <linux/net.h>
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#include <linux/ipv6.h>
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#include <linux/kthread.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/un.h>
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#include <linux/uaccess.h>
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#include <linux/inet.h>
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#include <linux/idr.h>
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#include <linux/file.h>
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#include <linux/parser.h>
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#include <net/9p/9p.h>
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#include <net/9p/client.h>
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#include <net/9p/transport.h>
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#define P9_PORT 564
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#define MAX_SOCK_BUF (64*1024)
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#define MAXPOLLWADDR 2
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/**
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* struct p9_fd_opts - per-transport options
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* @rfd: file descriptor for reading (trans=fd)
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* @wfd: file descriptor for writing (trans=fd)
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* @port: port to connect to (trans=tcp)
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*
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*/
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struct p9_fd_opts {
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int rfd;
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int wfd;
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u16 port;
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};
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/**
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* struct p9_trans_fd - transport state
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* @rd: reference to file to read from
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* @wr: reference of file to write to
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* @conn: connection state reference
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*
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*/
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struct p9_trans_fd {
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struct file *rd;
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struct file *wr;
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struct p9_conn *conn;
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};
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/*
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* Option Parsing (code inspired by NFS code)
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* - a little lazy - parse all fd-transport options
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*/
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enum {
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/* Options that take integer arguments */
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Opt_port, Opt_rfdno, Opt_wfdno, Opt_err,
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};
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static const match_table_t tokens = {
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{Opt_port, "port=%u"},
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{Opt_rfdno, "rfdno=%u"},
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{Opt_wfdno, "wfdno=%u"},
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{Opt_err, NULL},
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};
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enum {
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Rworksched = 1, /* read work scheduled or running */
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Rpending = 2, /* can read */
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Wworksched = 4, /* write work scheduled or running */
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Wpending = 8, /* can write */
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};
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struct p9_poll_wait {
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struct p9_conn *conn;
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wait_queue_t wait;
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wait_queue_head_t *wait_addr;
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};
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/**
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* struct p9_conn - fd mux connection state information
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* @mux_list: list link for mux to manage multiple connections (?)
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* @client: reference to client instance for this connection
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* @err: error state
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* @req_list: accounting for requests which have been sent
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* @unsent_req_list: accounting for requests that haven't been sent
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* @rcall: current response &p9_fcall structure
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* @rpos: read position in current frame
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* @rbuf: current read buffer
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* @wpos: write position for current frame
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* @wsize: amount of data to write for current frame
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* @wbuf: current write buffer
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* @poll_wait: array of wait_q's for various worker threads
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* @poll_waddr: ????
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* @pt: poll state
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* @rq: current read work
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* @wq: current write work
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* @wsched: ????
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*
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*/
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struct p9_conn {
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struct list_head mux_list;
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struct p9_client *client;
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int err;
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struct list_head req_list;
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struct list_head unsent_req_list;
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struct p9_fcall *rcall;
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int rpos;
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char *rbuf;
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int wpos;
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int wsize;
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char *wbuf;
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struct list_head poll_pending_link;
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struct p9_poll_wait poll_wait[MAXPOLLWADDR];
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poll_table pt;
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struct work_struct rq;
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struct work_struct wq;
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unsigned long wsched;
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};
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static DEFINE_SPINLOCK(p9_poll_lock);
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static LIST_HEAD(p9_poll_pending_list);
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static struct workqueue_struct *p9_mux_wq;
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static struct task_struct *p9_poll_task;
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static void p9_mux_poll_stop(struct p9_conn *m)
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{
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unsigned long flags;
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int i;
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for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
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struct p9_poll_wait *pwait = &m->poll_wait[i];
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if (pwait->wait_addr) {
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remove_wait_queue(pwait->wait_addr, &pwait->wait);
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pwait->wait_addr = NULL;
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}
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}
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spin_lock_irqsave(&p9_poll_lock, flags);
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list_del_init(&m->poll_pending_link);
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spin_unlock_irqrestore(&p9_poll_lock, flags);
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}
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static void p9_conn_rpc_cb(struct p9_client *, struct p9_req_t *);
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static void p9_mux_flush_cb(struct p9_client *client, struct p9_req_t *freq)
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{
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struct p9_conn *m = client->trans;
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struct p9_req_t *req;
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P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p rc %p err %d oldtag %d\n", m,
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freq->tc, freq->rc, freq->t_err,
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freq->tc->params.tflush.oldtag);
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req = p9_tag_lookup(client, freq->tc->params.tflush.oldtag);
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if (req) {
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req->status = REQ_STATUS_FLSHD;
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list_del(&req->req_list);
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p9_conn_rpc_cb(client, req);
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}
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p9_free_req(client, freq);
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}
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static void p9_conn_rpc_cb(struct p9_client *client, struct p9_req_t *req)
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{
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P9_DPRINTK(P9_DEBUG_MUX, "req %p\n", req);
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if (req->tc->id == P9_TFLUSH) { /* flush callback */
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P9_DPRINTK(P9_DEBUG_MUX, "flush req %p\n", req);
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p9_mux_flush_cb(client, req);
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} else { /* normal wakeup path */
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P9_DPRINTK(P9_DEBUG_MUX, "normal req %p\n", req);
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if (!req->t_err && (req->status == REQ_STATUS_FLSHD ||
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req->status == REQ_STATUS_FLSH))
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req->t_err = -ERESTARTSYS;
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wake_up(req->wq);
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}
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}
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/**
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* p9_conn_cancel - cancel all pending requests with error
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* @m: mux data
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* @err: error code
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*
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*/
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void p9_conn_cancel(struct p9_conn *m, int err)
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{
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struct p9_req_t *req, *rtmp;
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LIST_HEAD(cancel_list);
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P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
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m->err = err;
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spin_lock(&m->client->lock);
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list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
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req->status = REQ_STATUS_ERROR;
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if (!req->t_err)
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req->t_err = err;
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list_move(&req->req_list, &cancel_list);
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}
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list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
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req->status = REQ_STATUS_ERROR;
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if (!req->t_err)
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req->t_err = err;
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list_move(&req->req_list, &cancel_list);
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}
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spin_unlock(&m->client->lock);
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list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
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list_del(&req->req_list);
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p9_conn_rpc_cb(m->client, req);
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}
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}
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static void process_request(struct p9_conn *m, struct p9_req_t *req)
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{
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int ecode;
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struct p9_str *ename;
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if (!req->t_err && req->rc->id == P9_RERROR) {
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ecode = req->rc->params.rerror.errno;
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ename = &req->rc->params.rerror.error;
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P9_DPRINTK(P9_DEBUG_MUX, "Rerror %.*s\n", ename->len,
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ename->str);
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if (m->client->dotu)
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req->t_err = -ecode;
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if (!req->t_err) {
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req->t_err = p9_errstr2errno(ename->str, ename->len);
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/* string match failed */
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if (!req->t_err) {
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PRINT_FCALL_ERROR("unknown error", req->rc);
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req->t_err = -ESERVERFAULT;
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}
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}
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} else if (req->tc && req->rc->id != req->tc->id + 1) {
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P9_DPRINTK(P9_DEBUG_ERROR,
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"fcall mismatch: expected %d, got %d\n",
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req->tc->id + 1, req->rc->id);
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if (!req->t_err)
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req->t_err = -EIO;
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}
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}
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static unsigned int
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p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt)
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{
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int ret, n;
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struct p9_trans_fd *ts = NULL;
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if (client && client->status == Connected)
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ts = client->trans;
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if (!ts)
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return -EREMOTEIO;
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if (!ts->rd->f_op || !ts->rd->f_op->poll)
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return -EIO;
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if (!ts->wr->f_op || !ts->wr->f_op->poll)
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return -EIO;
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ret = ts->rd->f_op->poll(ts->rd, pt);
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if (ret < 0)
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return ret;
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if (ts->rd != ts->wr) {
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n = ts->wr->f_op->poll(ts->wr, pt);
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if (n < 0)
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return n;
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ret = (ret & ~POLLOUT) | (n & ~POLLIN);
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}
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return ret;
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}
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/**
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* p9_fd_read- read from a fd
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* @client: client instance
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* @v: buffer to receive data into
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* @len: size of receive buffer
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*
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*/
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static int p9_fd_read(struct p9_client *client, void *v, int len)
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{
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int ret;
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struct p9_trans_fd *ts = NULL;
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if (client && client->status != Disconnected)
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ts = client->trans;
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if (!ts)
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return -EREMOTEIO;
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if (!(ts->rd->f_flags & O_NONBLOCK))
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P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n");
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ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
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if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
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client->status = Disconnected;
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return ret;
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}
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/**
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* p9_read_work - called when there is some data to be read from a transport
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* @work: container of work to be done
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*
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*/
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static void p9_read_work(struct work_struct *work)
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{
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int n, err;
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struct p9_conn *m;
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struct p9_req_t *req;
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struct p9_fcall *rcall;
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char *rbuf;
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m = container_of(work, struct p9_conn, rq);
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if (m->err < 0)
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return;
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rcall = NULL;
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P9_DPRINTK(P9_DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos);
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if (!m->rcall) {
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m->rcall =
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kmalloc(sizeof(struct p9_fcall) + m->client->msize,
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GFP_KERNEL);
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if (!m->rcall) {
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err = -ENOMEM;
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goto error;
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}
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m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall);
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m->rpos = 0;
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}
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clear_bit(Rpending, &m->wsched);
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err = p9_fd_read(m->client, m->rbuf + m->rpos,
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m->client->msize - m->rpos);
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P9_DPRINTK(P9_DEBUG_MUX, "mux %p got %d bytes\n", m, err);
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if (err == -EAGAIN) {
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clear_bit(Rworksched, &m->wsched);
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return;
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}
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if (err <= 0)
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goto error;
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m->rpos += err;
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while (m->rpos > 4) {
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n = le32_to_cpu(*(__le32 *) m->rbuf);
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if (n >= m->client->msize) {
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P9_DPRINTK(P9_DEBUG_ERROR,
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"requested packet size too big: %d\n", n);
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err = -EIO;
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goto error;
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}
|
|
|
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if (m->rpos < n)
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break;
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|
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err =
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p9_deserialize_fcall(m->rbuf, n, m->rcall, m->client->dotu);
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if (err < 0)
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goto error;
|
|
|
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#ifdef CONFIG_NET_9P_DEBUG
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if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
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char buf[150];
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|
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p9_printfcall(buf, sizeof(buf), m->rcall,
|
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m->client->dotu);
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printk(KERN_NOTICE ">>> %p %s\n", m, buf);
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}
|
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#endif
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|
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rcall = m->rcall;
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rbuf = m->rbuf;
|
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if (m->rpos > n) {
|
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m->rcall = kmalloc(sizeof(struct p9_fcall) +
|
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m->client->msize, GFP_KERNEL);
|
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if (!m->rcall) {
|
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err = -ENOMEM;
|
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goto error;
|
|
}
|
|
|
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m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall);
|
|
memmove(m->rbuf, rbuf + n, m->rpos - n);
|
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m->rpos -= n;
|
|
} else {
|
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m->rcall = NULL;
|
|
m->rbuf = NULL;
|
|
m->rpos = 0;
|
|
}
|
|
|
|
P9_DPRINTK(P9_DEBUG_MUX, "mux %p fcall id %d tag %d\n", m,
|
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rcall->id, rcall->tag);
|
|
|
|
req = p9_tag_lookup(m->client, rcall->tag);
|
|
|
|
if (req) {
|
|
if (req->status != REQ_STATUS_FLSH) {
|
|
list_del(&req->req_list);
|
|
req->status = REQ_STATUS_RCVD;
|
|
}
|
|
|
|
req->rc = rcall;
|
|
process_request(m, req);
|
|
|
|
if (req->status != REQ_STATUS_FLSH)
|
|
p9_conn_rpc_cb(m->client, req);
|
|
} else {
|
|
if (err >= 0 && rcall->id != P9_RFLUSH)
|
|
P9_DPRINTK(P9_DEBUG_ERROR,
|
|
"unexpected response mux %p id %d tag %d\n",
|
|
m, rcall->id, rcall->tag);
|
|
kfree(rcall);
|
|
}
|
|
}
|
|
|
|
if (!list_empty(&m->req_list)) {
|
|
if (test_and_clear_bit(Rpending, &m->wsched))
|
|
n = POLLIN;
|
|
else
|
|
n = p9_fd_poll(m->client, NULL);
|
|
|
|
if (n & POLLIN) {
|
|
P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m);
|
|
queue_work(p9_mux_wq, &m->rq);
|
|
} else
|
|
clear_bit(Rworksched, &m->wsched);
|
|
} else
|
|
clear_bit(Rworksched, &m->wsched);
|
|
|
|
return;
|
|
|
|
error:
|
|
p9_conn_cancel(m, err);
|
|
clear_bit(Rworksched, &m->wsched);
|
|
}
|
|
|
|
/**
|
|
* p9_fd_write - write to a socket
|
|
* @client: client instance
|
|
* @v: buffer to send data from
|
|
* @len: size of send buffer
|
|
*
|
|
*/
|
|
|
|
static int p9_fd_write(struct p9_client *client, void *v, int len)
|
|
{
|
|
int ret;
|
|
mm_segment_t oldfs;
|
|
struct p9_trans_fd *ts = NULL;
|
|
|
|
if (client && client->status != Disconnected)
|
|
ts = client->trans;
|
|
|
|
if (!ts)
|
|
return -EREMOTEIO;
|
|
|
|
if (!(ts->wr->f_flags & O_NONBLOCK))
|
|
P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n");
|
|
|
|
oldfs = get_fs();
|
|
set_fs(get_ds());
|
|
/* The cast to a user pointer is valid due to the set_fs() */
|
|
ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos);
|
|
set_fs(oldfs);
|
|
|
|
if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
|
|
client->status = Disconnected;
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* p9_write_work - called when a transport can send some data
|
|
* @work: container for work to be done
|
|
*
|
|
*/
|
|
|
|
static void p9_write_work(struct work_struct *work)
|
|
{
|
|
int n, err;
|
|
struct p9_conn *m;
|
|
struct p9_req_t *req;
|
|
|
|
m = container_of(work, struct p9_conn, wq);
|
|
|
|
if (m->err < 0) {
|
|
clear_bit(Wworksched, &m->wsched);
|
|
return;
|
|
}
|
|
|
|
if (!m->wsize) {
|
|
if (list_empty(&m->unsent_req_list)) {
|
|
clear_bit(Wworksched, &m->wsched);
|
|
return;
|
|
}
|
|
|
|
spin_lock(&m->client->lock);
|
|
req = list_entry(m->unsent_req_list.next, struct p9_req_t,
|
|
req_list);
|
|
req->status = REQ_STATUS_SENT;
|
|
list_move_tail(&req->req_list, &m->req_list);
|
|
|
|
m->wbuf = req->tc->sdata;
|
|
m->wsize = req->tc->size;
|
|
m->wpos = 0;
|
|
spin_unlock(&m->client->lock);
|
|
}
|
|
|
|
P9_DPRINTK(P9_DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos,
|
|
m->wsize);
|
|
clear_bit(Wpending, &m->wsched);
|
|
err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos);
|
|
P9_DPRINTK(P9_DEBUG_MUX, "mux %p sent %d bytes\n", m, err);
|
|
if (err == -EAGAIN) {
|
|
clear_bit(Wworksched, &m->wsched);
|
|
return;
|
|
}
|
|
|
|
if (err < 0)
|
|
goto error;
|
|
else if (err == 0) {
|
|
err = -EREMOTEIO;
|
|
goto error;
|
|
}
|
|
|
|
m->wpos += err;
|
|
if (m->wpos == m->wsize)
|
|
m->wpos = m->wsize = 0;
|
|
|
|
if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) {
|
|
if (test_and_clear_bit(Wpending, &m->wsched))
|
|
n = POLLOUT;
|
|
else
|
|
n = p9_fd_poll(m->client, NULL);
|
|
|
|
if (n & POLLOUT) {
|
|
P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m);
|
|
queue_work(p9_mux_wq, &m->wq);
|
|
} else
|
|
clear_bit(Wworksched, &m->wsched);
|
|
} else
|
|
clear_bit(Wworksched, &m->wsched);
|
|
|
|
return;
|
|
|
|
error:
|
|
p9_conn_cancel(m, err);
|
|
clear_bit(Wworksched, &m->wsched);
|
|
}
|
|
|
|
static int p9_pollwake(wait_queue_t *wait, unsigned mode, int sync, void *key)
|
|
{
|
|
struct p9_poll_wait *pwait =
|
|
container_of(wait, struct p9_poll_wait, wait);
|
|
struct p9_conn *m = pwait->conn;
|
|
unsigned long flags;
|
|
DECLARE_WAITQUEUE(dummy_wait, p9_poll_task);
|
|
|
|
spin_lock_irqsave(&p9_poll_lock, flags);
|
|
if (list_empty(&m->poll_pending_link))
|
|
list_add_tail(&m->poll_pending_link, &p9_poll_pending_list);
|
|
spin_unlock_irqrestore(&p9_poll_lock, flags);
|
|
|
|
/* perform the default wake up operation */
|
|
return default_wake_function(&dummy_wait, mode, sync, key);
|
|
}
|
|
|
|
/**
|
|
* p9_pollwait - add poll task to the wait queue
|
|
* @filp: file pointer being polled
|
|
* @wait_address: wait_q to block on
|
|
* @p: poll state
|
|
*
|
|
* called by files poll operation to add v9fs-poll task to files wait queue
|
|
*/
|
|
|
|
static void
|
|
p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
|
|
{
|
|
struct p9_conn *m = container_of(p, struct p9_conn, pt);
|
|
struct p9_poll_wait *pwait = NULL;
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
|
|
if (m->poll_wait[i].wait_addr == NULL) {
|
|
pwait = &m->poll_wait[i];
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!pwait) {
|
|
P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n");
|
|
return;
|
|
}
|
|
|
|
if (!wait_address) {
|
|
P9_DPRINTK(P9_DEBUG_ERROR, "no wait_address\n");
|
|
pwait->wait_addr = ERR_PTR(-EIO);
|
|
return;
|
|
}
|
|
|
|
pwait->conn = m;
|
|
pwait->wait_addr = wait_address;
|
|
init_waitqueue_func_entry(&pwait->wait, p9_pollwake);
|
|
add_wait_queue(wait_address, &pwait->wait);
|
|
}
|
|
|
|
/**
|
|
* p9_conn_create - allocate and initialize the per-session mux data
|
|
* @client: client instance
|
|
*
|
|
* Note: Creates the polling task if this is the first session.
|
|
*/
|
|
|
|
static struct p9_conn *p9_conn_create(struct p9_client *client)
|
|
{
|
|
int i, n;
|
|
struct p9_conn *m;
|
|
|
|
P9_DPRINTK(P9_DEBUG_MUX, "client %p msize %d\n", client, client->msize);
|
|
m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL);
|
|
if (!m)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
INIT_LIST_HEAD(&m->mux_list);
|
|
m->client = client;
|
|
|
|
INIT_LIST_HEAD(&m->req_list);
|
|
INIT_LIST_HEAD(&m->unsent_req_list);
|
|
INIT_WORK(&m->rq, p9_read_work);
|
|
INIT_WORK(&m->wq, p9_write_work);
|
|
INIT_LIST_HEAD(&m->poll_pending_link);
|
|
init_poll_funcptr(&m->pt, p9_pollwait);
|
|
|
|
n = p9_fd_poll(client, &m->pt);
|
|
if (n & POLLIN) {
|
|
P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m);
|
|
set_bit(Rpending, &m->wsched);
|
|
}
|
|
|
|
if (n & POLLOUT) {
|
|
P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
|
|
set_bit(Wpending, &m->wsched);
|
|
}
|
|
|
|
for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
|
|
if (IS_ERR(m->poll_wait[i].wait_addr)) {
|
|
p9_mux_poll_stop(m);
|
|
kfree(m);
|
|
/* return the error code */
|
|
return (void *)m->poll_wait[i].wait_addr;
|
|
}
|
|
}
|
|
|
|
return m;
|
|
}
|
|
|
|
/**
|
|
* p9_poll_mux - polls a mux and schedules read or write works if necessary
|
|
* @m: connection to poll
|
|
*
|
|
*/
|
|
|
|
static void p9_poll_mux(struct p9_conn *m)
|
|
{
|
|
int n;
|
|
|
|
if (m->err < 0)
|
|
return;
|
|
|
|
n = p9_fd_poll(m->client, NULL);
|
|
if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
|
|
P9_DPRINTK(P9_DEBUG_MUX, "error mux %p err %d\n", m, n);
|
|
if (n >= 0)
|
|
n = -ECONNRESET;
|
|
p9_conn_cancel(m, n);
|
|
}
|
|
|
|
if (n & POLLIN) {
|
|
set_bit(Rpending, &m->wsched);
|
|
P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m);
|
|
if (!test_and_set_bit(Rworksched, &m->wsched)) {
|
|
P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m);
|
|
queue_work(p9_mux_wq, &m->rq);
|
|
}
|
|
}
|
|
|
|
if (n & POLLOUT) {
|
|
set_bit(Wpending, &m->wsched);
|
|
P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
|
|
if ((m->wsize || !list_empty(&m->unsent_req_list))
|
|
&& !test_and_set_bit(Wworksched, &m->wsched)) {
|
|
P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m);
|
|
queue_work(p9_mux_wq, &m->wq);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* p9_send_request - send 9P request
|
|
* The function can sleep until the request is scheduled for sending.
|
|
* The function can be interrupted. Return from the function is not
|
|
* a guarantee that the request is sent successfully. Can return errors
|
|
* that can be retrieved by PTR_ERR macros.
|
|
*
|
|
* @m: mux data
|
|
* @tc: request to be sent
|
|
*
|
|
*/
|
|
|
|
static struct p9_req_t *p9_send_request(struct p9_conn *m, struct p9_fcall *tc)
|
|
{
|
|
int tag;
|
|
int n;
|
|
struct p9_req_t *req;
|
|
|
|
P9_DPRINTK(P9_DEBUG_MUX, "mux %p task %p tcall %p id %d\n", m, current,
|
|
tc, tc->id);
|
|
if (m->err < 0)
|
|
return ERR_PTR(m->err);
|
|
|
|
tag = P9_NOTAG;
|
|
if (tc->id != P9_TVERSION) {
|
|
tag = p9_idpool_get(m->client->tagpool);
|
|
if (tag < 0)
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
p9_set_tag(tc, tag);
|
|
|
|
req = p9_tag_alloc(m->client, tag);
|
|
|
|
#ifdef CONFIG_NET_9P_DEBUG
|
|
if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
|
|
char buf[150];
|
|
|
|
p9_printfcall(buf, sizeof(buf), tc, m->client->dotu);
|
|
printk(KERN_NOTICE "<<< %p %s\n", m, buf);
|
|
}
|
|
#endif
|
|
|
|
req->tag = tag;
|
|
req->tc = tc;
|
|
req->rc = NULL;
|
|
req->t_err = 0;
|
|
req->status = REQ_STATUS_UNSENT;
|
|
|
|
spin_lock(&m->client->lock);
|
|
list_add_tail(&req->req_list, &m->unsent_req_list);
|
|
spin_unlock(&m->client->lock);
|
|
|
|
if (test_and_clear_bit(Wpending, &m->wsched))
|
|
n = POLLOUT;
|
|
else
|
|
n = p9_fd_poll(m->client, NULL);
|
|
|
|
if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
|
|
queue_work(p9_mux_wq, &m->wq);
|
|
|
|
return req;
|
|
}
|
|
|
|
static int
|
|
p9_mux_flush_request(struct p9_conn *m, struct p9_req_t *req)
|
|
{
|
|
struct p9_fcall *fc;
|
|
struct p9_req_t *rreq, *rptr;
|
|
|
|
P9_DPRINTK(P9_DEBUG_MUX, "mux %p req %p tag %d\n", m, req, req->tag);
|
|
|
|
/* if a response was received for a request, do nothing */
|
|
if (req->rc || req->t_err) {
|
|
P9_DPRINTK(P9_DEBUG_MUX,
|
|
"mux %p req %p response already received\n", m, req);
|
|
return 0;
|
|
}
|
|
|
|
req->status = REQ_STATUS_FLSH;
|
|
|
|
spin_lock(&m->client->lock);
|
|
/* if the request is not sent yet, just remove it from the list */
|
|
list_for_each_entry_safe(rreq, rptr, &m->unsent_req_list, req_list) {
|
|
if (rreq->tag == req->tag) {
|
|
P9_DPRINTK(P9_DEBUG_MUX,
|
|
"mux %p req %p request is not sent yet\n", m, req);
|
|
list_del(&rreq->req_list);
|
|
req->status = REQ_STATUS_FLSHD;
|
|
spin_unlock(&m->client->lock);
|
|
p9_conn_rpc_cb(m->client, req);
|
|
return 0;
|
|
}
|
|
}
|
|
spin_unlock(&m->client->lock);
|
|
|
|
clear_thread_flag(TIF_SIGPENDING);
|
|
fc = p9_create_tflush(req->tag);
|
|
p9_send_request(m, fc);
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* p9_fd_rpc- sends 9P request and waits until a response is available.
|
|
* The function can be interrupted.
|
|
* @client: client instance
|
|
* @tc: request to be sent
|
|
* @rc: pointer where a pointer to the response is stored
|
|
*
|
|
*/
|
|
|
|
int
|
|
p9_fd_rpc(struct p9_client *client, struct p9_fcall *tc, struct p9_fcall **rc)
|
|
{
|
|
struct p9_trans_fd *p = client->trans;
|
|
struct p9_conn *m = p->conn;
|
|
int err, sigpending;
|
|
unsigned long flags;
|
|
struct p9_req_t *req;
|
|
|
|
if (rc)
|
|
*rc = NULL;
|
|
|
|
sigpending = 0;
|
|
if (signal_pending(current)) {
|
|
sigpending = 1;
|
|
clear_thread_flag(TIF_SIGPENDING);
|
|
}
|
|
|
|
req = p9_send_request(m, tc);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
err = wait_event_interruptible(*req->wq, req->rc != NULL ||
|
|
req->t_err < 0);
|
|
if (req->t_err < 0)
|
|
err = req->t_err;
|
|
|
|
if (err == -ERESTARTSYS && client->status == Connected
|
|
&& m->err == 0) {
|
|
if (p9_mux_flush_request(m, req)) {
|
|
/* wait until we get response of the flush message */
|
|
do {
|
|
clear_thread_flag(TIF_SIGPENDING);
|
|
err = wait_event_interruptible(*req->wq,
|
|
req->rc || req->t_err);
|
|
} while (!req->rc && !req->t_err &&
|
|
err == -ERESTARTSYS &&
|
|
client->status == Connected && !m->err);
|
|
|
|
err = -ERESTARTSYS;
|
|
}
|
|
sigpending = 1;
|
|
}
|
|
|
|
if (sigpending) {
|
|
spin_lock_irqsave(¤t->sighand->siglock, flags);
|
|
recalc_sigpending();
|
|
spin_unlock_irqrestore(¤t->sighand->siglock, flags);
|
|
}
|
|
|
|
if (rc)
|
|
*rc = req->rc;
|
|
else
|
|
kfree(req->rc);
|
|
|
|
p9_free_req(client, req);
|
|
if (err > 0)
|
|
err = -EIO;
|
|
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* parse_options - parse mount options into session structure
|
|
* @options: options string passed from mount
|
|
* @opts: transport-specific structure to parse options into
|
|
*
|
|
* Returns 0 upon success, -ERRNO upon failure
|
|
*/
|
|
|
|
static int parse_opts(char *params, struct p9_fd_opts *opts)
|
|
{
|
|
char *p;
|
|
substring_t args[MAX_OPT_ARGS];
|
|
int option;
|
|
char *options;
|
|
int ret;
|
|
|
|
opts->port = P9_PORT;
|
|
opts->rfd = ~0;
|
|
opts->wfd = ~0;
|
|
|
|
if (!params)
|
|
return 0;
|
|
|
|
options = kstrdup(params, GFP_KERNEL);
|
|
if (!options) {
|
|
P9_DPRINTK(P9_DEBUG_ERROR,
|
|
"failed to allocate copy of option string\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
while ((p = strsep(&options, ",")) != NULL) {
|
|
int token;
|
|
int r;
|
|
if (!*p)
|
|
continue;
|
|
token = match_token(p, tokens, args);
|
|
r = match_int(&args[0], &option);
|
|
if (r < 0) {
|
|
P9_DPRINTK(P9_DEBUG_ERROR,
|
|
"integer field, but no integer?\n");
|
|
ret = r;
|
|
continue;
|
|
}
|
|
switch (token) {
|
|
case Opt_port:
|
|
opts->port = option;
|
|
break;
|
|
case Opt_rfdno:
|
|
opts->rfd = option;
|
|
break;
|
|
case Opt_wfdno:
|
|
opts->wfd = option;
|
|
break;
|
|
default:
|
|
continue;
|
|
}
|
|
}
|
|
kfree(options);
|
|
return 0;
|
|
}
|
|
|
|
static int p9_fd_open(struct p9_client *client, int rfd, int wfd)
|
|
{
|
|
struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd),
|
|
GFP_KERNEL);
|
|
if (!ts)
|
|
return -ENOMEM;
|
|
|
|
ts->rd = fget(rfd);
|
|
ts->wr = fget(wfd);
|
|
if (!ts->rd || !ts->wr) {
|
|
if (ts->rd)
|
|
fput(ts->rd);
|
|
if (ts->wr)
|
|
fput(ts->wr);
|
|
kfree(ts);
|
|
return -EIO;
|
|
}
|
|
|
|
client->trans = ts;
|
|
client->status = Connected;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int p9_socket_open(struct p9_client *client, struct socket *csocket)
|
|
{
|
|
int fd, ret;
|
|
|
|
csocket->sk->sk_allocation = GFP_NOIO;
|
|
fd = sock_map_fd(csocket, 0);
|
|
if (fd < 0) {
|
|
P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n");
|
|
return fd;
|
|
}
|
|
|
|
ret = p9_fd_open(client, fd, fd);
|
|
if (ret < 0) {
|
|
P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to open fd\n");
|
|
sockfd_put(csocket);
|
|
return ret;
|
|
}
|
|
|
|
((struct p9_trans_fd *)client->trans)->rd->f_flags |= O_NONBLOCK;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* p9_mux_destroy - cancels all pending requests and frees mux resources
|
|
* @m: mux to destroy
|
|
*
|
|
*/
|
|
|
|
static void p9_conn_destroy(struct p9_conn *m)
|
|
{
|
|
P9_DPRINTK(P9_DEBUG_MUX, "mux %p prev %p next %p\n", m,
|
|
m->mux_list.prev, m->mux_list.next);
|
|
|
|
p9_mux_poll_stop(m);
|
|
cancel_work_sync(&m->rq);
|
|
cancel_work_sync(&m->wq);
|
|
|
|
p9_conn_cancel(m, -ECONNRESET);
|
|
|
|
m->client = NULL;
|
|
kfree(m);
|
|
}
|
|
|
|
/**
|
|
* p9_fd_close - shutdown file descriptor transport
|
|
* @client: client instance
|
|
*
|
|
*/
|
|
|
|
static void p9_fd_close(struct p9_client *client)
|
|
{
|
|
struct p9_trans_fd *ts;
|
|
|
|
if (!client)
|
|
return;
|
|
|
|
ts = client->trans;
|
|
if (!ts)
|
|
return;
|
|
|
|
client->status = Disconnected;
|
|
|
|
p9_conn_destroy(ts->conn);
|
|
|
|
if (ts->rd)
|
|
fput(ts->rd);
|
|
if (ts->wr)
|
|
fput(ts->wr);
|
|
|
|
kfree(ts);
|
|
}
|
|
|
|
/*
|
|
* stolen from NFS - maybe should be made a generic function?
|
|
*/
|
|
static inline int valid_ipaddr4(const char *buf)
|
|
{
|
|
int rc, count, in[4];
|
|
|
|
rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
|
|
if (rc != 4)
|
|
return -EINVAL;
|
|
for (count = 0; count < 4; count++) {
|
|
if (in[count] > 255)
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
|
|
{
|
|
int err;
|
|
struct socket *csocket;
|
|
struct sockaddr_in sin_server;
|
|
struct p9_fd_opts opts;
|
|
struct p9_trans_fd *p = NULL; /* this gets allocated in p9_fd_open */
|
|
|
|
err = parse_opts(args, &opts);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (valid_ipaddr4(addr) < 0)
|
|
return -EINVAL;
|
|
|
|
csocket = NULL;
|
|
|
|
sin_server.sin_family = AF_INET;
|
|
sin_server.sin_addr.s_addr = in_aton(addr);
|
|
sin_server.sin_port = htons(opts.port);
|
|
sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket);
|
|
|
|
if (!csocket) {
|
|
P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n");
|
|
err = -EIO;
|
|
goto error;
|
|
}
|
|
|
|
err = csocket->ops->connect(csocket,
|
|
(struct sockaddr *)&sin_server,
|
|
sizeof(struct sockaddr_in), 0);
|
|
if (err < 0) {
|
|
P9_EPRINTK(KERN_ERR,
|
|
"p9_trans_tcp: problem connecting socket to %s\n",
|
|
addr);
|
|
goto error;
|
|
}
|
|
|
|
err = p9_socket_open(client, csocket);
|
|
if (err < 0)
|
|
goto error;
|
|
|
|
p = (struct p9_trans_fd *) client->trans;
|
|
p->conn = p9_conn_create(client);
|
|
if (IS_ERR(p->conn)) {
|
|
err = PTR_ERR(p->conn);
|
|
p->conn = NULL;
|
|
goto error;
|
|
}
|
|
|
|
return 0;
|
|
|
|
error:
|
|
if (csocket)
|
|
sock_release(csocket);
|
|
|
|
kfree(p);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
p9_fd_create_unix(struct p9_client *client, const char *addr, char *args)
|
|
{
|
|
int err;
|
|
struct socket *csocket;
|
|
struct sockaddr_un sun_server;
|
|
struct p9_trans_fd *p = NULL; /* this gets allocated in p9_fd_open */
|
|
|
|
csocket = NULL;
|
|
|
|
if (strlen(addr) > UNIX_PATH_MAX) {
|
|
P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n",
|
|
addr);
|
|
err = -ENAMETOOLONG;
|
|
goto error;
|
|
}
|
|
|
|
sun_server.sun_family = PF_UNIX;
|
|
strcpy(sun_server.sun_path, addr);
|
|
sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket);
|
|
err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
|
|
sizeof(struct sockaddr_un) - 1, 0);
|
|
if (err < 0) {
|
|
P9_EPRINTK(KERN_ERR,
|
|
"p9_trans_unix: problem connecting socket: %s: %d\n",
|
|
addr, err);
|
|
goto error;
|
|
}
|
|
|
|
err = p9_socket_open(client, csocket);
|
|
if (err < 0)
|
|
goto error;
|
|
|
|
p = (struct p9_trans_fd *) client->trans;
|
|
p->conn = p9_conn_create(client);
|
|
if (IS_ERR(p->conn)) {
|
|
err = PTR_ERR(p->conn);
|
|
p->conn = NULL;
|
|
goto error;
|
|
}
|
|
|
|
return 0;
|
|
|
|
error:
|
|
if (csocket)
|
|
sock_release(csocket);
|
|
|
|
kfree(p);
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
p9_fd_create(struct p9_client *client, const char *addr, char *args)
|
|
{
|
|
int err;
|
|
struct p9_fd_opts opts;
|
|
struct p9_trans_fd *p = NULL; /* this get allocated in p9_fd_open */
|
|
|
|
parse_opts(args, &opts);
|
|
|
|
if (opts.rfd == ~0 || opts.wfd == ~0) {
|
|
printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
|
|
return -ENOPROTOOPT;
|
|
}
|
|
|
|
err = p9_fd_open(client, opts.rfd, opts.wfd);
|
|
if (err < 0)
|
|
goto error;
|
|
|
|
p = (struct p9_trans_fd *) client->trans;
|
|
p->conn = p9_conn_create(client);
|
|
if (IS_ERR(p->conn)) {
|
|
err = PTR_ERR(p->conn);
|
|
p->conn = NULL;
|
|
goto error;
|
|
}
|
|
|
|
return 0;
|
|
|
|
error:
|
|
kfree(p);
|
|
return err;
|
|
}
|
|
|
|
static struct p9_trans_module p9_tcp_trans = {
|
|
.name = "tcp",
|
|
.maxsize = MAX_SOCK_BUF,
|
|
.def = 1,
|
|
.create = p9_fd_create_tcp,
|
|
.close = p9_fd_close,
|
|
.rpc = p9_fd_rpc,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static struct p9_trans_module p9_unix_trans = {
|
|
.name = "unix",
|
|
.maxsize = MAX_SOCK_BUF,
|
|
.def = 0,
|
|
.create = p9_fd_create_unix,
|
|
.close = p9_fd_close,
|
|
.rpc = p9_fd_rpc,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static struct p9_trans_module p9_fd_trans = {
|
|
.name = "fd",
|
|
.maxsize = MAX_SOCK_BUF,
|
|
.def = 0,
|
|
.create = p9_fd_create,
|
|
.close = p9_fd_close,
|
|
.rpc = p9_fd_rpc,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
/**
|
|
* p9_poll_proc - poll worker thread
|
|
* @a: thread state and arguments
|
|
*
|
|
* polls all v9fs transports for new events and queues the appropriate
|
|
* work to the work queue
|
|
*
|
|
*/
|
|
|
|
static int p9_poll_proc(void *a)
|
|
{
|
|
unsigned long flags;
|
|
|
|
P9_DPRINTK(P9_DEBUG_MUX, "start %p\n", current);
|
|
repeat:
|
|
spin_lock_irqsave(&p9_poll_lock, flags);
|
|
while (!list_empty(&p9_poll_pending_list)) {
|
|
struct p9_conn *conn = list_first_entry(&p9_poll_pending_list,
|
|
struct p9_conn,
|
|
poll_pending_link);
|
|
list_del_init(&conn->poll_pending_link);
|
|
spin_unlock_irqrestore(&p9_poll_lock, flags);
|
|
|
|
p9_poll_mux(conn);
|
|
|
|
spin_lock_irqsave(&p9_poll_lock, flags);
|
|
}
|
|
spin_unlock_irqrestore(&p9_poll_lock, flags);
|
|
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
if (list_empty(&p9_poll_pending_list)) {
|
|
P9_DPRINTK(P9_DEBUG_MUX, "sleeping...\n");
|
|
schedule();
|
|
}
|
|
__set_current_state(TASK_RUNNING);
|
|
|
|
if (!kthread_should_stop())
|
|
goto repeat;
|
|
|
|
P9_DPRINTK(P9_DEBUG_MUX, "finish\n");
|
|
return 0;
|
|
}
|
|
|
|
int p9_trans_fd_init(void)
|
|
{
|
|
p9_mux_wq = create_workqueue("v9fs");
|
|
if (!p9_mux_wq) {
|
|
printk(KERN_WARNING "v9fs: mux: creating workqueue failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
p9_poll_task = kthread_run(p9_poll_proc, NULL, "v9fs-poll");
|
|
if (IS_ERR(p9_poll_task)) {
|
|
destroy_workqueue(p9_mux_wq);
|
|
printk(KERN_WARNING "v9fs: mux: creating poll task failed\n");
|
|
return PTR_ERR(p9_poll_task);
|
|
}
|
|
|
|
v9fs_register_trans(&p9_tcp_trans);
|
|
v9fs_register_trans(&p9_unix_trans);
|
|
v9fs_register_trans(&p9_fd_trans);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void p9_trans_fd_exit(void)
|
|
{
|
|
kthread_stop(p9_poll_task);
|
|
v9fs_unregister_trans(&p9_tcp_trans);
|
|
v9fs_unregister_trans(&p9_unix_trans);
|
|
v9fs_unregister_trans(&p9_fd_trans);
|
|
|
|
destroy_workqueue(p9_mux_wq);
|
|
}
|