mirror of https://gitee.com/openkylin/linux.git
1531 lines
33 KiB
C
1531 lines
33 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/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 ERREQFLUSH 1
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#define SCHED_TIMEOUT 10
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#define MAXPOLLWADDR 2
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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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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 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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enum {
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None,
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Flushing,
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Flushed,
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};
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struct p9_req;
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typedef void (*p9_conn_req_callback)(struct p9_req *req, void *a);
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struct p9_req {
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spinlock_t lock; /* protect request structure */
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int tag;
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struct p9_fcall *tcall;
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struct p9_fcall *rcall;
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int err;
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p9_conn_req_callback cb;
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void *cba;
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int flush;
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struct list_head req_list;
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};
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struct p9_mux_poll_task;
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struct p9_conn {
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spinlock_t lock; /* protect lock structure */
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struct list_head mux_list;
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struct p9_mux_poll_task *poll_task;
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int msize;
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unsigned char extended;
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struct p9_trans *trans;
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struct p9_idpool *tagpool;
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int err;
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wait_queue_head_t equeue;
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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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wait_queue_t poll_wait[MAXPOLLWADDR];
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wait_queue_head_t *poll_waddr[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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struct p9_mux_poll_task {
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struct task_struct *task;
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struct list_head mux_list;
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int muxnum;
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};
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struct p9_mux_rpc {
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struct p9_conn *m;
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int err;
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struct p9_fcall *tcall;
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struct p9_fcall *rcall;
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wait_queue_head_t wqueue;
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};
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static int p9_poll_proc(void *);
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static void p9_read_work(struct work_struct *work);
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static void p9_write_work(struct work_struct *work);
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static void p9_pollwait(struct file *filp, wait_queue_head_t *wait_address,
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poll_table *p);
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static int p9_fd_write(struct p9_trans *trans, void *v, int len);
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static int p9_fd_read(struct p9_trans *trans, void *v, int len);
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static DEFINE_MUTEX(p9_mux_task_lock);
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static struct workqueue_struct *p9_mux_wq;
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static int p9_mux_num;
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static int p9_mux_poll_task_num;
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static struct p9_mux_poll_task p9_mux_poll_tasks[100];
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static void p9_conn_destroy(struct p9_conn *);
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static unsigned int p9_fd_poll(struct p9_trans *trans,
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struct poll_table_struct *pt);
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#ifdef P9_NONBLOCK
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static int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc,
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p9_conn_req_callback cb, void *a);
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#endif /* P9_NONBLOCK */
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static void p9_conn_cancel(struct p9_conn *m, int err);
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static int p9_mux_global_init(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++)
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p9_mux_poll_tasks[i].task = NULL;
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p9_mux_wq = create_workqueue("v9fs");
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if (!p9_mux_wq) {
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printk(KERN_WARNING "v9fs: mux: creating workqueue failed\n");
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return -ENOMEM;
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}
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return 0;
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}
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static u16 p9_mux_get_tag(struct p9_conn *m)
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{
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int tag;
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tag = p9_idpool_get(m->tagpool);
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if (tag < 0)
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return P9_NOTAG;
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else
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return (u16) tag;
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}
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static void p9_mux_put_tag(struct p9_conn *m, u16 tag)
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{
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if (tag != P9_NOTAG && p9_idpool_check(tag, m->tagpool))
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p9_idpool_put(tag, m->tagpool);
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}
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/**
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* p9_mux_calc_poll_procs - calculates the number of polling procs
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* based on the number of mounted v9fs filesystems.
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*
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* The current implementation returns sqrt of the number of mounts.
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*/
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static int p9_mux_calc_poll_procs(int muxnum)
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{
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int n;
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if (p9_mux_poll_task_num)
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n = muxnum / p9_mux_poll_task_num +
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(muxnum % p9_mux_poll_task_num ? 1 : 0);
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else
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n = 1;
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if (n > ARRAY_SIZE(p9_mux_poll_tasks))
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n = ARRAY_SIZE(p9_mux_poll_tasks);
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return n;
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}
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static int p9_mux_poll_start(struct p9_conn *m)
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{
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int i, n;
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struct p9_mux_poll_task *vpt, *vptlast;
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struct task_struct *pproc;
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P9_DPRINTK(P9_DEBUG_MUX, "mux %p muxnum %d procnum %d\n", m, p9_mux_num,
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p9_mux_poll_task_num);
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mutex_lock(&p9_mux_task_lock);
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n = p9_mux_calc_poll_procs(p9_mux_num + 1);
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if (n > p9_mux_poll_task_num) {
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for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++) {
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if (p9_mux_poll_tasks[i].task == NULL) {
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vpt = &p9_mux_poll_tasks[i];
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P9_DPRINTK(P9_DEBUG_MUX, "create proc %p\n",
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vpt);
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pproc = kthread_create(p9_poll_proc, vpt,
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"v9fs-poll");
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if (!IS_ERR(pproc)) {
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vpt->task = pproc;
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INIT_LIST_HEAD(&vpt->mux_list);
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vpt->muxnum = 0;
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p9_mux_poll_task_num++;
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wake_up_process(vpt->task);
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}
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break;
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}
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}
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if (i >= ARRAY_SIZE(p9_mux_poll_tasks))
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P9_DPRINTK(P9_DEBUG_ERROR,
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"warning: no free poll slots\n");
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}
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n = (p9_mux_num + 1) / p9_mux_poll_task_num +
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((p9_mux_num + 1) % p9_mux_poll_task_num ? 1 : 0);
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vptlast = NULL;
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for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++) {
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vpt = &p9_mux_poll_tasks[i];
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if (vpt->task != NULL) {
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vptlast = vpt;
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if (vpt->muxnum < n) {
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P9_DPRINTK(P9_DEBUG_MUX, "put in proc %d\n", i);
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list_add(&m->mux_list, &vpt->mux_list);
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vpt->muxnum++;
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m->poll_task = vpt;
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memset(&m->poll_waddr, 0,
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sizeof(m->poll_waddr));
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init_poll_funcptr(&m->pt, p9_pollwait);
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break;
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}
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}
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}
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if (i >= ARRAY_SIZE(p9_mux_poll_tasks)) {
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if (vptlast == NULL) {
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mutex_unlock(&p9_mux_task_lock);
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return -ENOMEM;
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}
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P9_DPRINTK(P9_DEBUG_MUX, "put in proc %d\n", i);
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list_add(&m->mux_list, &vptlast->mux_list);
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vptlast->muxnum++;
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m->poll_task = vptlast;
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memset(&m->poll_waddr, 0, sizeof(m->poll_waddr));
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init_poll_funcptr(&m->pt, p9_pollwait);
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}
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p9_mux_num++;
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mutex_unlock(&p9_mux_task_lock);
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return 0;
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}
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static void p9_mux_poll_stop(struct p9_conn *m)
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{
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int i;
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struct p9_mux_poll_task *vpt;
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mutex_lock(&p9_mux_task_lock);
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vpt = m->poll_task;
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list_del(&m->mux_list);
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for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) {
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if (m->poll_waddr[i] != NULL) {
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remove_wait_queue(m->poll_waddr[i], &m->poll_wait[i]);
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m->poll_waddr[i] = NULL;
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}
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}
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vpt->muxnum--;
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if (!vpt->muxnum) {
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P9_DPRINTK(P9_DEBUG_MUX, "destroy proc %p\n", vpt);
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kthread_stop(vpt->task);
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vpt->task = NULL;
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p9_mux_poll_task_num--;
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}
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p9_mux_num--;
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mutex_unlock(&p9_mux_task_lock);
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}
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/**
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* p9_conn_create - allocate and initialize the per-session mux data
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* Creates the polling task if this is the first session.
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*
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* @trans - transport structure
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* @msize - maximum message size
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* @extended - extended flag
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*/
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static struct p9_conn *p9_conn_create(struct p9_trans *trans)
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{
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int i, n;
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struct p9_conn *m, *mtmp;
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P9_DPRINTK(P9_DEBUG_MUX, "transport %p msize %d\n", trans,
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trans->msize);
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m = kmalloc(sizeof(struct p9_conn), GFP_KERNEL);
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if (!m)
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return ERR_PTR(-ENOMEM);
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spin_lock_init(&m->lock);
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INIT_LIST_HEAD(&m->mux_list);
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m->msize = trans->msize;
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m->extended = trans->extended;
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m->trans = trans;
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m->tagpool = p9_idpool_create();
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if (IS_ERR(m->tagpool)) {
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mtmp = ERR_PTR(-ENOMEM);
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kfree(m);
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return mtmp;
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}
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m->err = 0;
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init_waitqueue_head(&m->equeue);
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INIT_LIST_HEAD(&m->req_list);
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INIT_LIST_HEAD(&m->unsent_req_list);
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m->rcall = NULL;
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m->rpos = 0;
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m->rbuf = NULL;
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m->wpos = m->wsize = 0;
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m->wbuf = NULL;
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INIT_WORK(&m->rq, p9_read_work);
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INIT_WORK(&m->wq, p9_write_work);
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m->wsched = 0;
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memset(&m->poll_waddr, 0, sizeof(m->poll_waddr));
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m->poll_task = NULL;
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n = p9_mux_poll_start(m);
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if (n) {
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kfree(m);
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return ERR_PTR(n);
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}
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n = p9_fd_poll(trans, &m->pt);
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if (n & POLLIN) {
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P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m);
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set_bit(Rpending, &m->wsched);
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}
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if (n & POLLOUT) {
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P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
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set_bit(Wpending, &m->wsched);
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}
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for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) {
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if (IS_ERR(m->poll_waddr[i])) {
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p9_mux_poll_stop(m);
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mtmp = (void *)m->poll_waddr; /* the error code */
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kfree(m);
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m = mtmp;
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break;
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}
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}
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return m;
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}
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/**
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* p9_mux_destroy - cancels all pending requests and frees mux resources
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*/
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static void p9_conn_destroy(struct p9_conn *m)
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{
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P9_DPRINTK(P9_DEBUG_MUX, "mux %p prev %p next %p\n", m,
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m->mux_list.prev, m->mux_list.next);
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p9_conn_cancel(m, -ECONNRESET);
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if (!list_empty(&m->req_list)) {
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/* wait until all processes waiting on this session exit */
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P9_DPRINTK(P9_DEBUG_MUX,
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"mux %p waiting for empty request queue\n", m);
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wait_event_timeout(m->equeue, (list_empty(&m->req_list)), 5000);
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P9_DPRINTK(P9_DEBUG_MUX, "mux %p request queue empty: %d\n", m,
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list_empty(&m->req_list));
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}
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p9_mux_poll_stop(m);
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m->trans = NULL;
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p9_idpool_destroy(m->tagpool);
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kfree(m);
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}
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/**
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* p9_pollwait - called by files poll operation to add v9fs-poll task
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* to files wait queue
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*/
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static void
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p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
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{
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int i;
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struct p9_conn *m;
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m = container_of(p, struct p9_conn, pt);
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for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++)
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if (m->poll_waddr[i] == NULL)
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break;
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if (i >= ARRAY_SIZE(m->poll_waddr)) {
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P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n");
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return;
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}
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m->poll_waddr[i] = wait_address;
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if (!wait_address) {
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P9_DPRINTK(P9_DEBUG_ERROR, "no wait_address\n");
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m->poll_waddr[i] = ERR_PTR(-EIO);
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return;
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}
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init_waitqueue_entry(&m->poll_wait[i], m->poll_task->task);
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add_wait_queue(wait_address, &m->poll_wait[i]);
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}
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/**
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* p9_poll_mux - polls a mux and schedules read or write works if necessary
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*/
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static void p9_poll_mux(struct p9_conn *m)
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{
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int n;
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if (m->err < 0)
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return;
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n = p9_fd_poll(m->trans, NULL);
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if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
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P9_DPRINTK(P9_DEBUG_MUX, "error mux %p err %d\n", m, n);
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if (n >= 0)
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n = -ECONNRESET;
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p9_conn_cancel(m, n);
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}
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if (n & POLLIN) {
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set_bit(Rpending, &m->wsched);
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P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m);
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if (!test_and_set_bit(Rworksched, &m->wsched)) {
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P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m);
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queue_work(p9_mux_wq, &m->rq);
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}
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}
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if (n & POLLOUT) {
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set_bit(Wpending, &m->wsched);
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P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
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if ((m->wsize || !list_empty(&m->unsent_req_list))
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&& !test_and_set_bit(Wworksched, &m->wsched)) {
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P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m);
|
|
queue_work(p9_mux_wq, &m->wq);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* p9_poll_proc - polls all v9fs transports for new events and queues
|
|
* the appropriate work to the work queue
|
|
*/
|
|
static int p9_poll_proc(void *a)
|
|
{
|
|
struct p9_conn *m, *mtmp;
|
|
struct p9_mux_poll_task *vpt;
|
|
|
|
vpt = a;
|
|
P9_DPRINTK(P9_DEBUG_MUX, "start %p %p\n", current, vpt);
|
|
while (!kthread_should_stop()) {
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
|
|
list_for_each_entry_safe(m, mtmp, &vpt->mux_list, mux_list) {
|
|
p9_poll_mux(m);
|
|
}
|
|
|
|
P9_DPRINTK(P9_DEBUG_MUX, "sleeping...\n");
|
|
schedule_timeout(SCHED_TIMEOUT * HZ);
|
|
}
|
|
|
|
__set_current_state(TASK_RUNNING);
|
|
P9_DPRINTK(P9_DEBUG_MUX, "finish\n");
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* p9_write_work - called when a transport can send some data
|
|
*/
|
|
static void p9_write_work(struct work_struct *work)
|
|
{
|
|
int n, err;
|
|
struct p9_conn *m;
|
|
struct p9_req *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->lock);
|
|
again:
|
|
req = list_entry(m->unsent_req_list.next, struct p9_req,
|
|
req_list);
|
|
list_move_tail(&req->req_list, &m->req_list);
|
|
if (req->err == ERREQFLUSH)
|
|
goto again;
|
|
|
|
m->wbuf = req->tcall->sdata;
|
|
m->wsize = req->tcall->size;
|
|
m->wpos = 0;
|
|
spin_unlock(&m->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->trans, 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->trans, 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 void process_request(struct p9_conn *m, struct p9_req *req)
|
|
{
|
|
int ecode;
|
|
struct p9_str *ename;
|
|
|
|
if (!req->err && req->rcall->id == P9_RERROR) {
|
|
ecode = req->rcall->params.rerror.errno;
|
|
ename = &req->rcall->params.rerror.error;
|
|
|
|
P9_DPRINTK(P9_DEBUG_MUX, "Rerror %.*s\n", ename->len,
|
|
ename->str);
|
|
|
|
if (m->extended)
|
|
req->err = -ecode;
|
|
|
|
if (!req->err) {
|
|
req->err = p9_errstr2errno(ename->str, ename->len);
|
|
|
|
/* string match failed */
|
|
if (!req->err) {
|
|
PRINT_FCALL_ERROR("unknown error", req->rcall);
|
|
req->err = -ESERVERFAULT;
|
|
}
|
|
}
|
|
} else if (req->tcall && req->rcall->id != req->tcall->id + 1) {
|
|
P9_DPRINTK(P9_DEBUG_ERROR,
|
|
"fcall mismatch: expected %d, got %d\n",
|
|
req->tcall->id + 1, req->rcall->id);
|
|
if (!req->err)
|
|
req->err = -EIO;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* p9_read_work - called when there is some data to be read from a transport
|
|
*/
|
|
static void p9_read_work(struct work_struct *work)
|
|
{
|
|
int n, err;
|
|
struct p9_conn *m;
|
|
struct p9_req *req, *rptr, *rreq;
|
|
struct p9_fcall *rcall;
|
|
char *rbuf;
|
|
|
|
m = container_of(work, struct p9_conn, rq);
|
|
|
|
if (m->err < 0)
|
|
return;
|
|
|
|
rcall = NULL;
|
|
P9_DPRINTK(P9_DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos);
|
|
|
|
if (!m->rcall) {
|
|
m->rcall =
|
|
kmalloc(sizeof(struct p9_fcall) + m->msize, GFP_KERNEL);
|
|
if (!m->rcall) {
|
|
err = -ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall);
|
|
m->rpos = 0;
|
|
}
|
|
|
|
clear_bit(Rpending, &m->wsched);
|
|
err = p9_fd_read(m->trans, m->rbuf + m->rpos, m->msize - m->rpos);
|
|
P9_DPRINTK(P9_DEBUG_MUX, "mux %p got %d bytes\n", m, err);
|
|
if (err == -EAGAIN) {
|
|
clear_bit(Rworksched, &m->wsched);
|
|
return;
|
|
}
|
|
|
|
if (err <= 0)
|
|
goto error;
|
|
|
|
m->rpos += err;
|
|
while (m->rpos > 4) {
|
|
n = le32_to_cpu(*(__le32 *) m->rbuf);
|
|
if (n >= m->msize) {
|
|
P9_DPRINTK(P9_DEBUG_ERROR,
|
|
"requested packet size too big: %d\n", n);
|
|
err = -EIO;
|
|
goto error;
|
|
}
|
|
|
|
if (m->rpos < n)
|
|
break;
|
|
|
|
err =
|
|
p9_deserialize_fcall(m->rbuf, n, m->rcall, m->extended);
|
|
if (err < 0)
|
|
goto error;
|
|
|
|
#ifdef CONFIG_NET_9P_DEBUG
|
|
if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
|
|
char buf[150];
|
|
|
|
p9_printfcall(buf, sizeof(buf), m->rcall,
|
|
m->extended);
|
|
printk(KERN_NOTICE ">>> %p %s\n", m, buf);
|
|
}
|
|
#endif
|
|
|
|
rcall = m->rcall;
|
|
rbuf = m->rbuf;
|
|
if (m->rpos > n) {
|
|
m->rcall = kmalloc(sizeof(struct p9_fcall) + m->msize,
|
|
GFP_KERNEL);
|
|
if (!m->rcall) {
|
|
err = -ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall);
|
|
memmove(m->rbuf, rbuf + n, m->rpos - n);
|
|
m->rpos -= n;
|
|
} else {
|
|
m->rcall = NULL;
|
|
m->rbuf = NULL;
|
|
m->rpos = 0;
|
|
}
|
|
|
|
P9_DPRINTK(P9_DEBUG_MUX, "mux %p fcall id %d tag %d\n", m,
|
|
rcall->id, rcall->tag);
|
|
|
|
req = NULL;
|
|
spin_lock(&m->lock);
|
|
list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) {
|
|
if (rreq->tag == rcall->tag) {
|
|
req = rreq;
|
|
if (req->flush != Flushing)
|
|
list_del(&req->req_list);
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&m->lock);
|
|
|
|
if (req) {
|
|
req->rcall = rcall;
|
|
process_request(m, req);
|
|
|
|
if (req->flush != Flushing) {
|
|
if (req->cb)
|
|
(*req->cb) (req, req->cba);
|
|
else
|
|
kfree(req->rcall);
|
|
|
|
wake_up(&m->equeue);
|
|
}
|
|
} 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->trans, 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_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
|
|
* @cb: callback function to call when response is received
|
|
* @cba: parameter to pass to the callback function
|
|
*/
|
|
static struct p9_req *p9_send_request(struct p9_conn *m,
|
|
struct p9_fcall *tc,
|
|
p9_conn_req_callback cb, void *cba)
|
|
{
|
|
int n;
|
|
struct p9_req *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);
|
|
|
|
req = kmalloc(sizeof(struct p9_req), GFP_KERNEL);
|
|
if (!req)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
if (tc->id == P9_TVERSION)
|
|
n = P9_NOTAG;
|
|
else
|
|
n = p9_mux_get_tag(m);
|
|
|
|
if (n < 0)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
p9_set_tag(tc, n);
|
|
|
|
#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->extended);
|
|
printk(KERN_NOTICE "<<< %p %s\n", m, buf);
|
|
}
|
|
#endif
|
|
|
|
spin_lock_init(&req->lock);
|
|
req->tag = n;
|
|
req->tcall = tc;
|
|
req->rcall = NULL;
|
|
req->err = 0;
|
|
req->cb = cb;
|
|
req->cba = cba;
|
|
req->flush = None;
|
|
|
|
spin_lock(&m->lock);
|
|
list_add_tail(&req->req_list, &m->unsent_req_list);
|
|
spin_unlock(&m->lock);
|
|
|
|
if (test_and_clear_bit(Wpending, &m->wsched))
|
|
n = POLLOUT;
|
|
else
|
|
n = p9_fd_poll(m->trans, NULL);
|
|
|
|
if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
|
|
queue_work(p9_mux_wq, &m->wq);
|
|
|
|
return req;
|
|
}
|
|
|
|
static void p9_mux_free_request(struct p9_conn *m, struct p9_req *req)
|
|
{
|
|
p9_mux_put_tag(m, req->tag);
|
|
kfree(req);
|
|
}
|
|
|
|
static void p9_mux_flush_cb(struct p9_req *freq, void *a)
|
|
{
|
|
int tag;
|
|
struct p9_conn *m;
|
|
struct p9_req *req, *rreq, *rptr;
|
|
|
|
m = a;
|
|
P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p rc %p err %d oldtag %d\n", m,
|
|
freq->tcall, freq->rcall, freq->err,
|
|
freq->tcall->params.tflush.oldtag);
|
|
|
|
spin_lock(&m->lock);
|
|
tag = freq->tcall->params.tflush.oldtag;
|
|
req = NULL;
|
|
list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) {
|
|
if (rreq->tag == tag) {
|
|
req = rreq;
|
|
list_del(&req->req_list);
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&m->lock);
|
|
|
|
if (req) {
|
|
spin_lock(&req->lock);
|
|
req->flush = Flushed;
|
|
spin_unlock(&req->lock);
|
|
|
|
if (req->cb)
|
|
(*req->cb) (req, req->cba);
|
|
else
|
|
kfree(req->rcall);
|
|
|
|
wake_up(&m->equeue);
|
|
}
|
|
|
|
kfree(freq->tcall);
|
|
kfree(freq->rcall);
|
|
p9_mux_free_request(m, freq);
|
|
}
|
|
|
|
static int
|
|
p9_mux_flush_request(struct p9_conn *m, struct p9_req *req)
|
|
{
|
|
struct p9_fcall *fc;
|
|
struct p9_req *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 */
|
|
spin_lock(&req->lock);
|
|
if (req->rcall || req->err) {
|
|
spin_unlock(&req->lock);
|
|
P9_DPRINTK(P9_DEBUG_MUX,
|
|
"mux %p req %p response already received\n", m, req);
|
|
return 0;
|
|
}
|
|
|
|
req->flush = Flushing;
|
|
spin_unlock(&req->lock);
|
|
|
|
spin_lock(&m->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->flush = Flushed;
|
|
spin_unlock(&m->lock);
|
|
if (req->cb)
|
|
(*req->cb) (req, req->cba);
|
|
return 0;
|
|
}
|
|
}
|
|
spin_unlock(&m->lock);
|
|
|
|
clear_thread_flag(TIF_SIGPENDING);
|
|
fc = p9_create_tflush(req->tag);
|
|
p9_send_request(m, fc, p9_mux_flush_cb, m);
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
p9_conn_rpc_cb(struct p9_req *req, void *a)
|
|
{
|
|
struct p9_mux_rpc *r;
|
|
|
|
P9_DPRINTK(P9_DEBUG_MUX, "req %p r %p\n", req, a);
|
|
r = a;
|
|
r->rcall = req->rcall;
|
|
r->err = req->err;
|
|
|
|
if (req->flush != None && !req->err)
|
|
r->err = -ERESTARTSYS;
|
|
|
|
wake_up(&r->wqueue);
|
|
}
|
|
|
|
/**
|
|
* p9_fd_rpc- sends 9P request and waits until a response is available.
|
|
* The function can be interrupted.
|
|
* @m: mux data
|
|
* @tc: request to be sent
|
|
* @rc: pointer where a pointer to the response is stored
|
|
*/
|
|
int
|
|
p9_fd_rpc(struct p9_trans *t, struct p9_fcall *tc, struct p9_fcall **rc)
|
|
{
|
|
struct p9_trans_fd *p = t->priv;
|
|
struct p9_conn *m = p->conn;
|
|
int err, sigpending;
|
|
unsigned long flags;
|
|
struct p9_req *req;
|
|
struct p9_mux_rpc r;
|
|
|
|
r.err = 0;
|
|
r.tcall = tc;
|
|
r.rcall = NULL;
|
|
r.m = m;
|
|
init_waitqueue_head(&r.wqueue);
|
|
|
|
if (rc)
|
|
*rc = NULL;
|
|
|
|
sigpending = 0;
|
|
if (signal_pending(current)) {
|
|
sigpending = 1;
|
|
clear_thread_flag(TIF_SIGPENDING);
|
|
}
|
|
|
|
req = p9_send_request(m, tc, p9_conn_rpc_cb, &r);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err);
|
|
return err;
|
|
}
|
|
|
|
err = wait_event_interruptible(r.wqueue, r.rcall != NULL || r.err < 0);
|
|
if (r.err < 0)
|
|
err = r.err;
|
|
|
|
if (err == -ERESTARTSYS && m->trans->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(r.wqueue,
|
|
r.rcall || r.err);
|
|
} while (!r.rcall && !r.err && err == -ERESTARTSYS &&
|
|
m->trans->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 = r.rcall;
|
|
else
|
|
kfree(r.rcall);
|
|
|
|
p9_mux_free_request(m, req);
|
|
if (err > 0)
|
|
err = -EIO;
|
|
|
|
return err;
|
|
}
|
|
|
|
#ifdef P9_NONBLOCK
|
|
/**
|
|
* p9_conn_rpcnb - sends 9P request without waiting for response.
|
|
* @m: mux data
|
|
* @tc: request to be sent
|
|
* @cb: callback function to be called when response arrives
|
|
* @cba: value to pass to the callback function
|
|
*/
|
|
int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc,
|
|
p9_conn_req_callback cb, void *a)
|
|
{
|
|
int err;
|
|
struct p9_req *req;
|
|
|
|
req = p9_send_request(m, tc, cb, a);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err);
|
|
return PTR_ERR(req);
|
|
}
|
|
|
|
P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p tag %d\n", m, tc, req->tag);
|
|
return 0;
|
|
}
|
|
#endif /* P9_NONBLOCK */
|
|
|
|
/**
|
|
* p9_conn_cancel - cancel all pending requests with error
|
|
* @m: mux data
|
|
* @err: error code
|
|
*/
|
|
void p9_conn_cancel(struct p9_conn *m, int err)
|
|
{
|
|
struct p9_req *req, *rtmp;
|
|
LIST_HEAD(cancel_list);
|
|
|
|
P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
|
|
m->err = err;
|
|
spin_lock(&m->lock);
|
|
list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
|
|
list_move(&req->req_list, &cancel_list);
|
|
}
|
|
list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
|
|
list_move(&req->req_list, &cancel_list);
|
|
}
|
|
spin_unlock(&m->lock);
|
|
|
|
list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
|
|
list_del(&req->req_list);
|
|
if (!req->err)
|
|
req->err = err;
|
|
|
|
if (req->cb)
|
|
(*req->cb) (req, req->cba);
|
|
else
|
|
kfree(req->rcall);
|
|
}
|
|
|
|
wake_up(&m->equeue);
|
|
}
|
|
|
|
/**
|
|
* v9fs_parse_options - parse mount options into session structure
|
|
* @options: options string passed from mount
|
|
* @v9ses: existing v9fs session information
|
|
*
|
|
*/
|
|
|
|
static void parse_opts(char *options, struct p9_fd_opts *opts)
|
|
{
|
|
char *p;
|
|
substring_t args[MAX_OPT_ARGS];
|
|
int option;
|
|
int ret;
|
|
|
|
opts->port = P9_PORT;
|
|
opts->rfd = ~0;
|
|
opts->wfd = ~0;
|
|
|
|
if (!options)
|
|
return;
|
|
|
|
while ((p = strsep(&options, ",")) != NULL) {
|
|
int token;
|
|
if (!*p)
|
|
continue;
|
|
token = match_token(p, tokens, args);
|
|
ret = match_int(&args[0], &option);
|
|
if (ret < 0) {
|
|
P9_DPRINTK(P9_DEBUG_ERROR,
|
|
"integer field, but no integer?\n");
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int p9_fd_open(struct p9_trans *trans, 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;
|
|
}
|
|
|
|
trans->priv = ts;
|
|
trans->status = Connected;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int p9_socket_open(struct p9_trans *trans, struct socket *csocket)
|
|
{
|
|
int fd, ret;
|
|
|
|
csocket->sk->sk_allocation = GFP_NOIO;
|
|
fd = sock_map_fd(csocket);
|
|
if (fd < 0) {
|
|
P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n");
|
|
return fd;
|
|
}
|
|
|
|
ret = p9_fd_open(trans, 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 *)trans->priv)->rd->f_flags |= O_NONBLOCK;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* p9_fd_read- read from a fd
|
|
* @v9ses: session information
|
|
* @v: buffer to receive data into
|
|
* @len: size of receive buffer
|
|
*
|
|
*/
|
|
static int p9_fd_read(struct p9_trans *trans, void *v, int len)
|
|
{
|
|
int ret;
|
|
struct p9_trans_fd *ts = NULL;
|
|
|
|
if (trans && trans->status != Disconnected)
|
|
ts = trans->priv;
|
|
|
|
if (!ts)
|
|
return -EREMOTEIO;
|
|
|
|
if (!(ts->rd->f_flags & O_NONBLOCK))
|
|
P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n");
|
|
|
|
ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
|
|
if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
|
|
trans->status = Disconnected;
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* p9_fd_write - write to a socket
|
|
* @v9ses: session information
|
|
* @v: buffer to send data from
|
|
* @len: size of send buffer
|
|
*
|
|
*/
|
|
static int p9_fd_write(struct p9_trans *trans, void *v, int len)
|
|
{
|
|
int ret;
|
|
mm_segment_t oldfs;
|
|
struct p9_trans_fd *ts = NULL;
|
|
|
|
if (trans && trans->status != Disconnected)
|
|
ts = trans->priv;
|
|
|
|
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)
|
|
trans->status = Disconnected;
|
|
return ret;
|
|
}
|
|
|
|
static unsigned int
|
|
p9_fd_poll(struct p9_trans *trans, struct poll_table_struct *pt)
|
|
{
|
|
int ret, n;
|
|
struct p9_trans_fd *ts = NULL;
|
|
mm_segment_t oldfs;
|
|
|
|
if (trans && trans->status == Connected)
|
|
ts = trans->priv;
|
|
|
|
if (!ts)
|
|
return -EREMOTEIO;
|
|
|
|
if (!ts->rd->f_op || !ts->rd->f_op->poll)
|
|
return -EIO;
|
|
|
|
if (!ts->wr->f_op || !ts->wr->f_op->poll)
|
|
return -EIO;
|
|
|
|
oldfs = get_fs();
|
|
set_fs(get_ds());
|
|
|
|
ret = ts->rd->f_op->poll(ts->rd, pt);
|
|
if (ret < 0)
|
|
goto end;
|
|
|
|
if (ts->rd != ts->wr) {
|
|
n = ts->wr->f_op->poll(ts->wr, pt);
|
|
if (n < 0) {
|
|
ret = n;
|
|
goto end;
|
|
}
|
|
ret = (ret & ~POLLOUT) | (n & ~POLLIN);
|
|
}
|
|
|
|
end:
|
|
set_fs(oldfs);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* p9_fd_close - shutdown socket
|
|
* @trans: private socket structure
|
|
*
|
|
*/
|
|
static void p9_fd_close(struct p9_trans *trans)
|
|
{
|
|
struct p9_trans_fd *ts;
|
|
|
|
if (!trans)
|
|
return;
|
|
|
|
ts = xchg(&trans->priv, NULL);
|
|
|
|
if (!ts)
|
|
return;
|
|
|
|
p9_conn_destroy(ts->conn);
|
|
|
|
trans->status = Disconnected;
|
|
if (ts->rd)
|
|
fput(ts->rd);
|
|
if (ts->wr)
|
|
fput(ts->wr);
|
|
kfree(ts);
|
|
}
|
|
|
|
static struct p9_trans *
|
|
p9_trans_create_tcp(const char *addr, char *args, int msize, unsigned char dotu)
|
|
{
|
|
int err;
|
|
struct p9_trans *trans;
|
|
struct socket *csocket;
|
|
struct sockaddr_in sin_server;
|
|
struct p9_fd_opts opts;
|
|
struct p9_trans_fd *p;
|
|
|
|
parse_opts(args, &opts);
|
|
|
|
csocket = NULL;
|
|
trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL);
|
|
if (!trans)
|
|
return ERR_PTR(-ENOMEM);
|
|
trans->msize = msize;
|
|
trans->extended = dotu;
|
|
trans->rpc = p9_fd_rpc;
|
|
trans->close = p9_fd_close;
|
|
|
|
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(trans, csocket);
|
|
if (err < 0)
|
|
goto error;
|
|
|
|
p = (struct p9_trans_fd *) trans->priv;
|
|
p->conn = p9_conn_create(trans);
|
|
if (IS_ERR(p->conn)) {
|
|
err = PTR_ERR(p->conn);
|
|
p->conn = NULL;
|
|
goto error;
|
|
}
|
|
|
|
return trans;
|
|
|
|
error:
|
|
if (csocket)
|
|
sock_release(csocket);
|
|
|
|
kfree(trans);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static struct p9_trans *
|
|
p9_trans_create_unix(const char *addr, char *args, int msize,
|
|
unsigned char dotu)
|
|
{
|
|
int err;
|
|
struct socket *csocket;
|
|
struct sockaddr_un sun_server;
|
|
struct p9_trans *trans;
|
|
struct p9_trans_fd *p;
|
|
|
|
csocket = NULL;
|
|
trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL);
|
|
if (!trans)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
trans->rpc = p9_fd_rpc;
|
|
trans->close = p9_fd_close;
|
|
|
|
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(trans, csocket);
|
|
if (err < 0)
|
|
goto error;
|
|
|
|
trans->msize = msize;
|
|
trans->extended = dotu;
|
|
p = (struct p9_trans_fd *) trans->priv;
|
|
p->conn = p9_conn_create(trans);
|
|
if (IS_ERR(p->conn)) {
|
|
err = PTR_ERR(p->conn);
|
|
p->conn = NULL;
|
|
goto error;
|
|
}
|
|
|
|
return trans;
|
|
|
|
error:
|
|
if (csocket)
|
|
sock_release(csocket);
|
|
|
|
kfree(trans);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static struct p9_trans *
|
|
p9_trans_create_fd(const char *name, char *args, int msize,
|
|
unsigned char extended)
|
|
{
|
|
int err;
|
|
struct p9_trans *trans;
|
|
struct p9_fd_opts opts;
|
|
struct p9_trans_fd *p;
|
|
|
|
parse_opts(args, &opts);
|
|
|
|
if (opts.rfd == ~0 || opts.wfd == ~0) {
|
|
printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
|
|
return ERR_PTR(-ENOPROTOOPT);
|
|
}
|
|
|
|
trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL);
|
|
if (!trans)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
trans->rpc = p9_fd_rpc;
|
|
trans->close = p9_fd_close;
|
|
|
|
err = p9_fd_open(trans, opts.rfd, opts.wfd);
|
|
if (err < 0)
|
|
goto error;
|
|
|
|
trans->msize = msize;
|
|
trans->extended = extended;
|
|
p = (struct p9_trans_fd *) trans->priv;
|
|
p->conn = p9_conn_create(trans);
|
|
if (IS_ERR(p->conn)) {
|
|
err = PTR_ERR(p->conn);
|
|
p->conn = NULL;
|
|
goto error;
|
|
}
|
|
|
|
return trans;
|
|
|
|
error:
|
|
kfree(trans);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static struct p9_trans_module p9_tcp_trans = {
|
|
.name = "tcp",
|
|
.maxsize = MAX_SOCK_BUF,
|
|
.def = 1,
|
|
.create = p9_trans_create_tcp,
|
|
};
|
|
|
|
static struct p9_trans_module p9_unix_trans = {
|
|
.name = "unix",
|
|
.maxsize = MAX_SOCK_BUF,
|
|
.def = 0,
|
|
.create = p9_trans_create_unix,
|
|
};
|
|
|
|
static struct p9_trans_module p9_fd_trans = {
|
|
.name = "fd",
|
|
.maxsize = MAX_SOCK_BUF,
|
|
.def = 0,
|
|
.create = p9_trans_create_fd,
|
|
};
|
|
|
|
static int __init p9_trans_fd_init(void)
|
|
{
|
|
int ret = p9_mux_global_init();
|
|
if (ret) {
|
|
printk(KERN_WARNING "9p: starting mux failed\n");
|
|
return ret;
|
|
}
|
|
|
|
v9fs_register_trans(&p9_tcp_trans);
|
|
v9fs_register_trans(&p9_unix_trans);
|
|
v9fs_register_trans(&p9_fd_trans);
|
|
|
|
return 0;
|
|
}
|
|
|
|
module_init(p9_trans_fd_init);
|
|
|
|
MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
|
|
MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
|
|
MODULE_LICENSE("GPL");
|