2005-09-09 20:04:22 +00:00
|
|
|
/*
|
|
|
|
* linux/fs/9p/mux.c
|
|
|
|
*
|
|
|
|
* Protocol Multiplexer
|
|
|
|
*
|
|
|
|
* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
|
2006-01-08 09:04:58 +00:00
|
|
|
* Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net>
|
2005-09-09 20:04:22 +00:00
|
|
|
*
|
|
|
|
* This program is free software; you can redistribute it and/or modify
|
|
|
|
* it under the terms of the GNU General Public License as published by
|
|
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
|
|
* (at your option) any later version.
|
|
|
|
*
|
|
|
|
* This program is distributed in the hope that it will be useful,
|
|
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
|
* GNU General Public License for more details.
|
|
|
|
*
|
|
|
|
* You should have received a copy of the GNU General Public License
|
|
|
|
* along with this program; if not, write to:
|
|
|
|
* Free Software Foundation
|
|
|
|
* 51 Franklin Street, Fifth Floor
|
|
|
|
* Boston, MA 02111-1301 USA
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/config.h>
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/errno.h>
|
|
|
|
#include <linux/fs.h>
|
2006-01-08 09:04:58 +00:00
|
|
|
#include <linux/poll.h>
|
2005-09-09 20:04:22 +00:00
|
|
|
#include <linux/kthread.h>
|
|
|
|
#include <linux/idr.h>
|
|
|
|
|
|
|
|
#include "debug.h"
|
|
|
|
#include "v9fs.h"
|
|
|
|
#include "9p.h"
|
|
|
|
#include "transport.h"
|
|
|
|
#include "conv.h"
|
|
|
|
#include "mux.h"
|
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
#define ERREQFLUSH 1
|
|
|
|
#define SCHED_TIMEOUT 10
|
|
|
|
#define MAXPOLLWADDR 2
|
|
|
|
|
|
|
|
enum {
|
|
|
|
Rworksched = 1, /* read work scheduled or running */
|
|
|
|
Rpending = 2, /* can read */
|
|
|
|
Wworksched = 4, /* write work scheduled or running */
|
|
|
|
Wpending = 8, /* can write */
|
|
|
|
};
|
|
|
|
|
|
|
|
struct v9fs_mux_poll_task;
|
|
|
|
|
|
|
|
struct v9fs_req {
|
|
|
|
int tag;
|
|
|
|
struct v9fs_fcall *tcall;
|
|
|
|
struct v9fs_fcall *rcall;
|
|
|
|
int err;
|
|
|
|
v9fs_mux_req_callback cb;
|
|
|
|
void *cba;
|
|
|
|
struct list_head req_list;
|
|
|
|
};
|
|
|
|
|
|
|
|
struct v9fs_mux_data {
|
|
|
|
spinlock_t lock;
|
|
|
|
struct list_head mux_list;
|
|
|
|
struct v9fs_mux_poll_task *poll_task;
|
|
|
|
int msize;
|
|
|
|
unsigned char *extended;
|
|
|
|
struct v9fs_transport *trans;
|
|
|
|
struct v9fs_idpool tidpool;
|
|
|
|
int err;
|
|
|
|
wait_queue_head_t equeue;
|
|
|
|
struct list_head req_list;
|
|
|
|
struct list_head unsent_req_list;
|
|
|
|
int rpos;
|
|
|
|
char *rbuf;
|
|
|
|
int wpos;
|
|
|
|
int wsize;
|
|
|
|
char *wbuf;
|
|
|
|
wait_queue_t poll_wait[MAXPOLLWADDR];
|
|
|
|
wait_queue_head_t *poll_waddr[MAXPOLLWADDR];
|
|
|
|
poll_table pt;
|
|
|
|
struct work_struct rq;
|
|
|
|
struct work_struct wq;
|
|
|
|
unsigned long wsched;
|
|
|
|
};
|
|
|
|
|
|
|
|
struct v9fs_mux_poll_task {
|
|
|
|
struct task_struct *task;
|
|
|
|
struct list_head mux_list;
|
|
|
|
int muxnum;
|
|
|
|
};
|
|
|
|
|
|
|
|
struct v9fs_mux_rpc {
|
|
|
|
struct v9fs_mux_data *m;
|
|
|
|
struct v9fs_req *req;
|
|
|
|
int err;
|
|
|
|
struct v9fs_fcall *rcall;
|
|
|
|
wait_queue_head_t wqueue;
|
|
|
|
};
|
|
|
|
|
|
|
|
static int v9fs_poll_proc(void *);
|
|
|
|
static void v9fs_read_work(void *);
|
|
|
|
static void v9fs_write_work(void *);
|
|
|
|
static void v9fs_pollwait(struct file *filp, wait_queue_head_t * wait_address,
|
|
|
|
poll_table * p);
|
|
|
|
|
|
|
|
static DECLARE_MUTEX(v9fs_mux_task_lock);
|
|
|
|
static struct workqueue_struct *v9fs_mux_wq;
|
|
|
|
|
|
|
|
static int v9fs_mux_num;
|
|
|
|
static int v9fs_mux_poll_task_num;
|
|
|
|
static struct v9fs_mux_poll_task v9fs_mux_poll_tasks[100];
|
|
|
|
|
|
|
|
void v9fs_mux_global_init(void)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (i = 0; i < ARRAY_SIZE(v9fs_mux_poll_tasks); i++)
|
|
|
|
v9fs_mux_poll_tasks[i].task = NULL;
|
|
|
|
|
|
|
|
v9fs_mux_wq = create_workqueue("v9fs");
|
|
|
|
}
|
2005-09-09 20:04:22 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
void v9fs_mux_global_exit(void)
|
2005-09-09 20:04:22 +00:00
|
|
|
{
|
2006-01-08 09:04:58 +00:00
|
|
|
destroy_workqueue(v9fs_mux_wq);
|
2005-09-09 20:04:22 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2006-01-08 09:04:58 +00:00
|
|
|
* v9fs_mux_calc_poll_procs - calculates the number of polling procs
|
|
|
|
* based on the number of mounted v9fs filesystems.
|
2005-09-09 20:04:22 +00:00
|
|
|
*
|
2006-01-08 09:04:58 +00:00
|
|
|
* The current implementation returns sqrt of the number of mounts.
|
2005-09-09 20:04:22 +00:00
|
|
|
*/
|
2006-01-08 09:04:58 +00:00
|
|
|
inline int v9fs_mux_calc_poll_procs(int muxnum)
|
|
|
|
{
|
|
|
|
int n;
|
|
|
|
|
|
|
|
if (v9fs_mux_poll_task_num)
|
|
|
|
n = muxnum / v9fs_mux_poll_task_num +
|
|
|
|
(muxnum % v9fs_mux_poll_task_num ? 1 : 0);
|
|
|
|
else
|
|
|
|
n = 1;
|
|
|
|
|
|
|
|
if (n > ARRAY_SIZE(v9fs_mux_poll_tasks))
|
|
|
|
n = ARRAY_SIZE(v9fs_mux_poll_tasks);
|
2005-09-09 20:04:22 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
return n;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void v9fs_mux_poll_start(struct v9fs_mux_data *m)
|
2005-09-09 20:04:22 +00:00
|
|
|
{
|
2006-01-08 09:04:58 +00:00
|
|
|
int i, n;
|
|
|
|
struct v9fs_mux_poll_task *vpt, *vptlast;
|
|
|
|
|
|
|
|
dprintk(DEBUG_MUX, "mux %p muxnum %d procnum %d\n", m, v9fs_mux_num,
|
|
|
|
v9fs_mux_poll_task_num);
|
|
|
|
up(&v9fs_mux_task_lock);
|
|
|
|
|
|
|
|
n = v9fs_mux_calc_poll_procs(v9fs_mux_num + 1);
|
|
|
|
if (n > v9fs_mux_poll_task_num) {
|
|
|
|
for (i = 0; i < ARRAY_SIZE(v9fs_mux_poll_tasks); i++) {
|
|
|
|
if (v9fs_mux_poll_tasks[i].task == NULL) {
|
|
|
|
vpt = &v9fs_mux_poll_tasks[i];
|
|
|
|
dprintk(DEBUG_MUX, "create proc %p\n", vpt);
|
|
|
|
vpt->task = kthread_create(v9fs_poll_proc,
|
|
|
|
vpt, "v9fs-poll");
|
|
|
|
INIT_LIST_HEAD(&vpt->mux_list);
|
|
|
|
vpt->muxnum = 0;
|
|
|
|
v9fs_mux_poll_task_num++;
|
|
|
|
wake_up_process(vpt->task);
|
|
|
|
break;
|
|
|
|
}
|
2005-09-09 20:04:22 +00:00
|
|
|
}
|
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
if (i >= ARRAY_SIZE(v9fs_mux_poll_tasks))
|
|
|
|
dprintk(DEBUG_ERROR, "warning: no free poll slots\n");
|
|
|
|
}
|
2005-09-09 20:04:22 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
n = (v9fs_mux_num + 1) / v9fs_mux_poll_task_num +
|
|
|
|
((v9fs_mux_num + 1) % v9fs_mux_poll_task_num ? 1 : 0);
|
|
|
|
|
|
|
|
vptlast = NULL;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(v9fs_mux_poll_tasks); i++) {
|
|
|
|
vpt = &v9fs_mux_poll_tasks[i];
|
|
|
|
if (vpt->task != NULL) {
|
|
|
|
vptlast = vpt;
|
|
|
|
if (vpt->muxnum < n) {
|
|
|
|
dprintk(DEBUG_MUX, "put in proc %d\n", i);
|
|
|
|
list_add(&m->mux_list, &vpt->mux_list);
|
|
|
|
vpt->muxnum++;
|
|
|
|
m->poll_task = vpt;
|
|
|
|
memset(&m->poll_waddr, 0, sizeof(m->poll_waddr));
|
|
|
|
init_poll_funcptr(&m->pt, v9fs_pollwait);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
2005-09-09 20:04:22 +00:00
|
|
|
}
|
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
if (i >= ARRAY_SIZE(v9fs_mux_poll_tasks)) {
|
|
|
|
dprintk(DEBUG_MUX, "put in proc %d\n", i);
|
|
|
|
list_add(&m->mux_list, &vptlast->mux_list);
|
|
|
|
vptlast->muxnum++;
|
|
|
|
m->poll_task = vpt;
|
|
|
|
memset(&m->poll_waddr, 0, sizeof(m->poll_waddr));
|
|
|
|
init_poll_funcptr(&m->pt, v9fs_pollwait);
|
2005-09-09 20:04:22 +00:00
|
|
|
}
|
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
v9fs_mux_num++;
|
|
|
|
down(&v9fs_mux_task_lock);
|
|
|
|
}
|
2005-09-09 20:04:22 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
static void v9fs_mux_poll_stop(struct v9fs_mux_data *m)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
struct v9fs_mux_poll_task *vpt;
|
|
|
|
|
|
|
|
up(&v9fs_mux_task_lock);
|
|
|
|
vpt = m->poll_task;
|
|
|
|
list_del(&m->mux_list);
|
|
|
|
for(i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) {
|
|
|
|
if (m->poll_waddr[i] != NULL) {
|
|
|
|
remove_wait_queue(m->poll_waddr[i], &m->poll_wait[i]);
|
|
|
|
m->poll_waddr[i] = NULL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
vpt->muxnum--;
|
|
|
|
if (!vpt->muxnum) {
|
|
|
|
dprintk(DEBUG_MUX, "destroy proc %p\n", vpt);
|
|
|
|
send_sig(SIGKILL, vpt->task, 1);
|
|
|
|
vpt->task = NULL;
|
|
|
|
v9fs_mux_poll_task_num--;
|
|
|
|
}
|
|
|
|
v9fs_mux_num--;
|
|
|
|
down(&v9fs_mux_task_lock);
|
|
|
|
}
|
2005-09-09 20:04:22 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
/**
|
|
|
|
* v9fs_mux_init - allocate and initialize the per-session mux data
|
|
|
|
* Creates the polling task if this is the first session.
|
|
|
|
*
|
|
|
|
* @trans - transport structure
|
|
|
|
* @msize - maximum message size
|
|
|
|
* @extended - pointer to the extended flag
|
|
|
|
*/
|
|
|
|
struct v9fs_mux_data *v9fs_mux_init(struct v9fs_transport *trans, int msize,
|
|
|
|
unsigned char *extended)
|
|
|
|
{
|
|
|
|
int i, n;
|
|
|
|
struct v9fs_mux_data *m, *mtmp;
|
|
|
|
|
|
|
|
dprintk(DEBUG_MUX, "transport %p msize %d\n", trans, msize);
|
|
|
|
m = kmalloc(sizeof(struct v9fs_mux_data) + 2 * msize, GFP_KERNEL);
|
|
|
|
if (!m)
|
|
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
|
|
|
|
spin_lock_init(&m->lock);
|
|
|
|
INIT_LIST_HEAD(&m->mux_list);
|
|
|
|
m->msize = msize;
|
|
|
|
m->extended = extended;
|
|
|
|
m->trans = trans;
|
|
|
|
idr_init(&m->tidpool.pool);
|
|
|
|
init_MUTEX(&m->tidpool.lock);
|
|
|
|
m->err = 0;
|
|
|
|
init_waitqueue_head(&m->equeue);
|
|
|
|
INIT_LIST_HEAD(&m->req_list);
|
|
|
|
INIT_LIST_HEAD(&m->unsent_req_list);
|
|
|
|
m->rpos = 0;
|
|
|
|
m->rbuf = (char *)m + sizeof(struct v9fs_mux_data);
|
|
|
|
m->wpos = m->wsize = 0;
|
|
|
|
m->wbuf = m->rbuf + msize;
|
|
|
|
INIT_WORK(&m->rq, v9fs_read_work, m);
|
|
|
|
INIT_WORK(&m->wq, v9fs_write_work, m);
|
|
|
|
m->wsched = 0;
|
|
|
|
memset(&m->poll_waddr, 0, sizeof(m->poll_waddr));
|
|
|
|
v9fs_mux_poll_start(m);
|
|
|
|
|
|
|
|
n = trans->poll(trans, &m->pt);
|
|
|
|
if (n & POLLIN) {
|
|
|
|
dprintk(DEBUG_MUX, "mux %p can read\n", m);
|
|
|
|
set_bit(Rpending, &m->wsched);
|
2005-09-09 20:04:22 +00:00
|
|
|
}
|
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
if (n & POLLOUT) {
|
|
|
|
dprintk(DEBUG_MUX, "mux %p can write\n", m);
|
|
|
|
set_bit(Wpending, &m->wsched);
|
2005-09-09 20:04:22 +00:00
|
|
|
}
|
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
for(i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) {
|
|
|
|
if (IS_ERR(m->poll_waddr[i])) {
|
|
|
|
v9fs_mux_poll_stop(m);
|
|
|
|
mtmp = (void *)m->poll_waddr; /* the error code */
|
|
|
|
kfree(m);
|
|
|
|
m = mtmp;
|
|
|
|
break;
|
|
|
|
}
|
2005-09-09 20:04:22 +00:00
|
|
|
}
|
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
return m;
|
|
|
|
}
|
2005-09-09 20:04:22 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
/**
|
|
|
|
* v9fs_mux_destroy - cancels all pending requests and frees mux resources
|
|
|
|
*/
|
|
|
|
void v9fs_mux_destroy(struct v9fs_mux_data *m)
|
|
|
|
{
|
|
|
|
dprintk(DEBUG_MUX, "mux %p prev %p next %p\n", m,
|
|
|
|
m->mux_list.prev, m->mux_list.next);
|
|
|
|
v9fs_mux_cancel(m, -ECONNRESET);
|
|
|
|
|
|
|
|
if (!list_empty(&m->req_list)) {
|
|
|
|
/* wait until all processes waiting on this session exit */
|
|
|
|
dprintk(DEBUG_MUX, "mux %p waiting for empty request queue\n",
|
|
|
|
m);
|
|
|
|
wait_event_timeout(m->equeue, (list_empty(&m->req_list)), 5000);
|
|
|
|
dprintk(DEBUG_MUX, "mux %p request queue empty: %d\n", m,
|
|
|
|
list_empty(&m->req_list));
|
|
|
|
}
|
2005-09-09 20:04:22 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
v9fs_mux_poll_stop(m);
|
|
|
|
m->trans = NULL;
|
2005-09-09 20:04:22 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
kfree(m);
|
2005-09-09 20:04:22 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2006-01-08 09:04:58 +00:00
|
|
|
* v9fs_pollwait - called by files poll operation to add v9fs-poll task
|
|
|
|
* to files wait queue
|
2005-09-09 20:04:22 +00:00
|
|
|
*/
|
2006-01-08 09:04:58 +00:00
|
|
|
static void
|
|
|
|
v9fs_pollwait(struct file *filp, wait_queue_head_t * wait_address,
|
|
|
|
poll_table * p)
|
2005-09-09 20:04:22 +00:00
|
|
|
{
|
2006-01-08 09:04:58 +00:00
|
|
|
int i;
|
|
|
|
struct v9fs_mux_data *m;
|
2005-09-09 20:04:22 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
m = container_of(p, struct v9fs_mux_data, pt);
|
|
|
|
for(i = 0; i < ARRAY_SIZE(m->poll_waddr); i++)
|
|
|
|
if (m->poll_waddr[i] == NULL)
|
|
|
|
break;
|
2005-09-09 20:04:28 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
if (i >= ARRAY_SIZE(m->poll_waddr)) {
|
|
|
|
dprintk(DEBUG_ERROR, "not enough wait_address slots\n");
|
|
|
|
return;
|
|
|
|
}
|
2005-09-09 20:04:28 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
m->poll_waddr[i] = wait_address;
|
2005-09-09 20:04:28 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
if (!wait_address) {
|
|
|
|
dprintk(DEBUG_ERROR, "no wait_address\n");
|
|
|
|
m->poll_waddr[i] = ERR_PTR(-EIO);
|
|
|
|
return;
|
|
|
|
}
|
2005-09-09 20:04:22 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
init_waitqueue_entry(&m->poll_wait[i], m->poll_task->task);
|
|
|
|
add_wait_queue(wait_address, &m->poll_wait[i]);
|
2005-09-09 20:04:22 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2006-01-08 09:04:58 +00:00
|
|
|
* v9fs_poll_mux - polls a mux and schedules read or write works if necessary
|
2005-09-09 20:04:22 +00:00
|
|
|
*/
|
2006-01-08 09:04:58 +00:00
|
|
|
static inline void v9fs_poll_mux(struct v9fs_mux_data *m)
|
2005-09-09 20:04:22 +00:00
|
|
|
{
|
2006-01-08 09:04:58 +00:00
|
|
|
int n;
|
2005-09-09 20:04:22 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
if (m->err < 0)
|
|
|
|
return;
|
|
|
|
|
|
|
|
n = m->trans->poll(m->trans, NULL);
|
|
|
|
if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
|
|
|
|
dprintk(DEBUG_MUX, "error mux %p err %d\n", m, n);
|
|
|
|
if (n >= 0)
|
|
|
|
n = -ECONNRESET;
|
|
|
|
v9fs_mux_cancel(m, n);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (n & POLLIN) {
|
|
|
|
set_bit(Rpending, &m->wsched);
|
|
|
|
dprintk(DEBUG_MUX, "mux %p can read\n", m);
|
|
|
|
if (!test_and_set_bit(Rworksched, &m->wsched)) {
|
|
|
|
dprintk(DEBUG_MUX, "schedule read work mux %p\n", m);
|
|
|
|
queue_work(v9fs_mux_wq, &m->rq);
|
|
|
|
}
|
|
|
|
}
|
2005-09-09 20:04:22 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
if (n & POLLOUT) {
|
|
|
|
set_bit(Wpending, &m->wsched);
|
|
|
|
dprintk(DEBUG_MUX, "mux %p can write\n", m);
|
|
|
|
if ((m->wsize || !list_empty(&m->unsent_req_list))
|
|
|
|
&& !test_and_set_bit(Wworksched, &m->wsched)) {
|
|
|
|
dprintk(DEBUG_MUX, "schedule write work mux %p\n", m);
|
|
|
|
queue_work(v9fs_mux_wq, &m->wq);
|
|
|
|
}
|
|
|
|
}
|
2005-09-09 20:04:22 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2006-01-08 09:04:58 +00:00
|
|
|
* v9fs_poll_proc - polls all v9fs transports for new events and queues
|
|
|
|
* the appropriate work to the work queue
|
2005-09-09 20:04:22 +00:00
|
|
|
*/
|
2006-01-08 09:04:58 +00:00
|
|
|
static int v9fs_poll_proc(void *a)
|
2005-09-09 20:04:22 +00:00
|
|
|
{
|
2006-01-08 09:04:58 +00:00
|
|
|
struct v9fs_mux_data *m, *mtmp;
|
|
|
|
struct v9fs_mux_poll_task *vpt;
|
2005-09-09 20:04:22 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
vpt = a;
|
|
|
|
dprintk(DEBUG_MUX, "start %p %p\n", current, vpt);
|
|
|
|
allow_signal(SIGKILL);
|
|
|
|
while (!kthread_should_stop()) {
|
|
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
|
|
if (signal_pending(current))
|
|
|
|
break;
|
2005-09-09 20:04:22 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
list_for_each_entry_safe(m, mtmp, &vpt->mux_list, mux_list) {
|
|
|
|
v9fs_poll_mux(m);
|
|
|
|
}
|
|
|
|
|
|
|
|
dprintk(DEBUG_MUX, "sleeping...\n");
|
|
|
|
schedule_timeout(SCHED_TIMEOUT * HZ);
|
|
|
|
}
|
2005-09-09 20:04:28 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
__set_current_state(TASK_RUNNING);
|
|
|
|
dprintk(DEBUG_MUX, "finish\n");
|
|
|
|
return 0;
|
|
|
|
}
|
2005-09-09 20:04:22 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
static inline int v9fs_write_req(struct v9fs_mux_data *m, struct v9fs_req *req)
|
|
|
|
{
|
|
|
|
int n;
|
|
|
|
|
|
|
|
list_move_tail(&req->req_list, &m->req_list);
|
|
|
|
n = v9fs_serialize_fcall(req->tcall, m->wbuf, m->msize, *m->extended);
|
|
|
|
if (n < 0) {
|
|
|
|
req->err = n;
|
|
|
|
list_del(&req->req_list);
|
|
|
|
if (req->cb) {
|
|
|
|
spin_unlock(&m->lock);
|
|
|
|
(*req->cb) (req->cba, req->tcall, req->rcall, req->err);
|
|
|
|
req->cb = NULL;
|
|
|
|
spin_lock(&m->lock);
|
|
|
|
} else
|
|
|
|
kfree(req->rcall);
|
|
|
|
|
|
|
|
kfree(req);
|
2005-09-09 20:04:22 +00:00
|
|
|
}
|
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
return n;
|
|
|
|
}
|
2005-09-09 20:04:22 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
/**
|
|
|
|
* v9fs_write_work - called when a transport can send some data
|
|
|
|
*/
|
|
|
|
static void v9fs_write_work(void *a)
|
|
|
|
{
|
|
|
|
int n, err;
|
|
|
|
struct v9fs_mux_data *m;
|
|
|
|
struct v9fs_req *req, *rtmp;
|
2005-09-09 20:04:22 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
m = a;
|
2005-09-09 20:04:22 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
if (m->err < 0) {
|
|
|
|
clear_bit(Wworksched, &m->wsched);
|
|
|
|
return;
|
2005-09-09 20:04:22 +00:00
|
|
|
}
|
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
if (!m->wsize) {
|
|
|
|
if (list_empty(&m->unsent_req_list)) {
|
|
|
|
clear_bit(Wworksched, &m->wsched);
|
|
|
|
return;
|
2005-09-09 20:04:22 +00:00
|
|
|
}
|
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
err = 0;
|
|
|
|
spin_lock(&m->lock);
|
|
|
|
list_for_each_entry_safe(req, rtmp, &m->unsent_req_list,
|
|
|
|
req_list) {
|
|
|
|
err = v9fs_write_req(m, req);
|
|
|
|
if (err > 0)
|
|
|
|
break;
|
2005-09-09 20:04:22 +00:00
|
|
|
}
|
2006-01-08 09:04:58 +00:00
|
|
|
|
|
|
|
m->wsize = err;
|
|
|
|
m->wpos = 0;
|
|
|
|
spin_unlock(&m->lock);
|
2005-09-09 20:04:22 +00:00
|
|
|
}
|
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
dprintk(DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos, m->wsize);
|
|
|
|
clear_bit(Wpending, &m->wsched);
|
|
|
|
err = m->trans->write(m->trans, m->wbuf + m->wpos, m->wsize - m->wpos);
|
|
|
|
dprintk(DEBUG_MUX, "mux %p sent %d bytes\n", m, err);
|
|
|
|
if (err == -EAGAIN) {
|
|
|
|
clear_bit(Wworksched, &m->wsched);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (err <= 0)
|
|
|
|
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 = m->trans->poll(m->trans, NULL);
|
|
|
|
|
|
|
|
if (n & POLLOUT) {
|
|
|
|
dprintk(DEBUG_MUX, "schedule write work mux %p\n", m);
|
|
|
|
queue_work(v9fs_mux_wq, &m->wq);
|
|
|
|
} else
|
|
|
|
clear_bit(Wworksched, &m->wsched);
|
|
|
|
} else
|
|
|
|
clear_bit(Wworksched, &m->wsched);
|
2005-09-09 20:04:22 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
return;
|
|
|
|
|
|
|
|
error:
|
|
|
|
v9fs_mux_cancel(m, err);
|
|
|
|
clear_bit(Wworksched, &m->wsched);
|
2005-09-09 20:04:22 +00:00
|
|
|
}
|
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
static void process_request(struct v9fs_mux_data *m, struct v9fs_req *req)
|
2005-09-09 20:04:23 +00:00
|
|
|
{
|
2006-01-08 09:04:58 +00:00
|
|
|
int ecode, tag;
|
|
|
|
char *ename;
|
|
|
|
|
|
|
|
tag = req->tag;
|
|
|
|
if (req->rcall->id == RERROR && !req->err) {
|
|
|
|
ecode = req->rcall->params.rerror.errno;
|
|
|
|
ename = req->rcall->params.rerror.error;
|
2005-09-09 20:04:23 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
dprintk(DEBUG_MUX, "Rerror %s\n", ename);
|
|
|
|
|
|
|
|
if (*m->extended)
|
|
|
|
req->err = -ecode;
|
|
|
|
|
|
|
|
if (!req->err) {
|
|
|
|
req->err = v9fs_errstr2errno(ename);
|
|
|
|
|
|
|
|
if (!req->err) { /* string match failed */
|
|
|
|
dprintk(DEBUG_ERROR, "unknown error: %s\n",
|
|
|
|
ename);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!req->err)
|
|
|
|
req->err = -ESERVERFAULT;
|
|
|
|
}
|
|
|
|
} else if (req->tcall && req->rcall->id != req->tcall->id + 1) {
|
|
|
|
dprintk(DEBUG_ERROR, "fcall mismatch: expected %d, got %d\n",
|
|
|
|
req->tcall->id + 1, req->rcall->id);
|
|
|
|
if (!req->err)
|
|
|
|
req->err = -EIO;
|
2005-09-09 20:04:23 +00:00
|
|
|
}
|
2006-01-08 09:04:58 +00:00
|
|
|
|
|
|
|
if (req->cb && req->err != ERREQFLUSH) {
|
|
|
|
dprintk(DEBUG_MUX, "calling callback tcall %p rcall %p\n",
|
|
|
|
req->tcall, req->rcall);
|
|
|
|
|
|
|
|
(*req->cb) (req->cba, req->tcall, req->rcall, req->err);
|
|
|
|
req->cb = NULL;
|
|
|
|
} else
|
|
|
|
kfree(req->rcall);
|
|
|
|
|
|
|
|
if (tag != V9FS_NOTAG)
|
|
|
|
v9fs_put_idpool(tag, &m->tidpool);
|
|
|
|
|
|
|
|
wake_up(&m->equeue);
|
|
|
|
kfree(req);
|
2005-09-09 20:04:23 +00:00
|
|
|
}
|
|
|
|
|
2005-09-09 20:04:22 +00:00
|
|
|
/**
|
2006-01-08 09:04:58 +00:00
|
|
|
* v9fs_read_work - called when there is some data to be read from a transport
|
2005-09-09 20:04:22 +00:00
|
|
|
*/
|
2006-01-08 09:04:58 +00:00
|
|
|
static void v9fs_read_work(void *a)
|
2005-09-09 20:04:22 +00:00
|
|
|
{
|
2006-01-08 09:04:58 +00:00
|
|
|
int n, err, rcallen;
|
|
|
|
struct v9fs_mux_data *m;
|
|
|
|
struct v9fs_req *req, *rptr, *rreq;
|
|
|
|
struct v9fs_fcall *rcall;
|
|
|
|
|
|
|
|
m = a;
|
|
|
|
|
|
|
|
if (m->err < 0)
|
|
|
|
return;
|
|
|
|
|
|
|
|
rcall = NULL;
|
|
|
|
dprintk(DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos);
|
|
|
|
clear_bit(Rpending, &m->wsched);
|
|
|
|
err = m->trans->read(m->trans, m->rbuf + m->rpos, m->msize - m->rpos);
|
|
|
|
dprintk(DEBUG_MUX, "mux %p got %d bytes\n", m, err);
|
|
|
|
if (err == -EAGAIN) {
|
|
|
|
clear_bit(Rworksched, &m->wsched);
|
|
|
|
return;
|
|
|
|
}
|
2005-09-09 20:04:22 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
if (err <= 0)
|
|
|
|
goto error;
|
2005-09-09 20:04:22 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
m->rpos += err;
|
|
|
|
while (m->rpos > 4) {
|
|
|
|
n = le32_to_cpu(*(__le32 *) m->rbuf);
|
|
|
|
if (n >= m->msize) {
|
|
|
|
dprintk(DEBUG_ERROR,
|
|
|
|
"requested packet size too big: %d\n", n);
|
|
|
|
err = -EIO;
|
|
|
|
goto error;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (m->rpos < n)
|
2005-09-09 20:04:22 +00:00
|
|
|
break;
|
2006-01-08 09:04:58 +00:00
|
|
|
|
|
|
|
rcallen = n + V9FS_FCALLHDRSZ;
|
|
|
|
rcall = kmalloc(rcallen, GFP_KERNEL);
|
|
|
|
if (!rcall) {
|
|
|
|
err = -ENOMEM;
|
|
|
|
goto error;
|
2005-09-09 20:04:22 +00:00
|
|
|
}
|
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
dump_data(m->rbuf, n);
|
|
|
|
err = v9fs_deserialize_fcall(m->rbuf, n, rcall, rcallen,
|
|
|
|
*m->extended);
|
2005-09-09 20:04:28 +00:00
|
|
|
if (err < 0) {
|
2006-01-08 09:04:58 +00:00
|
|
|
kfree(rcall);
|
|
|
|
goto error;
|
2005-09-09 20:04:22 +00:00
|
|
|
}
|
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
dprintk(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;
|
|
|
|
req->rcall = rcall;
|
|
|
|
list_del(&req->req_list);
|
|
|
|
spin_unlock(&m->lock);
|
|
|
|
process_request(m, req);
|
|
|
|
break;
|
2005-09-09 20:04:22 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!req) {
|
2006-01-08 09:04:58 +00:00
|
|
|
spin_unlock(&m->lock);
|
|
|
|
if (err >= 0 && rcall->id != RFLUSH)
|
2005-09-09 20:04:28 +00:00
|
|
|
dprintk(DEBUG_ERROR,
|
2006-01-08 09:04:58 +00:00
|
|
|
"unexpected response mux %p id %d tag %d\n",
|
|
|
|
m, rcall->id, rcall->tag);
|
2005-09-09 20:04:22 +00:00
|
|
|
kfree(rcall);
|
|
|
|
}
|
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
if (m->rpos > n)
|
|
|
|
memmove(m->rbuf, m->rbuf + n, m->rpos - n);
|
|
|
|
m->rpos -= n;
|
2005-09-09 20:04:22 +00:00
|
|
|
}
|
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
if (!list_empty(&m->req_list)) {
|
|
|
|
if (test_and_clear_bit(Rpending, &m->wsched))
|
|
|
|
n = POLLIN;
|
|
|
|
else
|
|
|
|
n = m->trans->poll(m->trans, NULL);
|
|
|
|
|
|
|
|
if (n & POLLIN) {
|
|
|
|
dprintk(DEBUG_MUX, "schedule read work mux %p\n", m);
|
|
|
|
queue_work(v9fs_mux_wq, &m->rq);
|
|
|
|
} else
|
|
|
|
clear_bit(Rworksched, &m->wsched);
|
|
|
|
} else
|
|
|
|
clear_bit(Rworksched, &m->wsched);
|
2005-09-09 20:04:22 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
return;
|
2005-09-09 20:04:22 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
error:
|
|
|
|
v9fs_mux_cancel(m, err);
|
|
|
|
clear_bit(Rworksched, &m->wsched);
|
2005-09-09 20:04:22 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2006-01-08 09:04:58 +00:00
|
|
|
* v9fs_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 succesfully. Can return errors
|
|
|
|
* that can be retrieved by PTR_ERR macros.
|
2005-09-09 20:04:22 +00:00
|
|
|
*
|
2006-01-08 09:04:58 +00:00
|
|
|
* @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
|
2005-09-09 20:04:22 +00:00
|
|
|
*/
|
2006-01-08 09:04:58 +00:00
|
|
|
static struct v9fs_req *v9fs_send_request(struct v9fs_mux_data *m,
|
|
|
|
struct v9fs_fcall *tc,
|
|
|
|
v9fs_mux_req_callback cb, void *cba)
|
|
|
|
{
|
|
|
|
int n;
|
|
|
|
struct v9fs_req *req;
|
|
|
|
|
|
|
|
dprintk(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 v9fs_req), GFP_KERNEL);
|
|
|
|
if (!req)
|
|
|
|
return ERR_PTR(-ENOMEM);
|
2005-09-09 20:04:22 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
if (tc->id == TVERSION)
|
|
|
|
n = V9FS_NOTAG;
|
|
|
|
else
|
|
|
|
n = v9fs_get_idpool(&m->tidpool);
|
|
|
|
|
|
|
|
if (n < 0)
|
|
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
|
|
|
|
tc->tag = n;
|
|
|
|
req->tag = n;
|
|
|
|
req->tcall = tc;
|
|
|
|
req->rcall = NULL;
|
|
|
|
req->err = 0;
|
|
|
|
req->cb = cb;
|
|
|
|
req->cba = cba;
|
|
|
|
|
|
|
|
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 = m->trans->poll(m->trans, NULL);
|
|
|
|
|
|
|
|
if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
|
|
|
|
queue_work(v9fs_mux_wq, &m->wq);
|
|
|
|
|
|
|
|
return req;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void
|
|
|
|
v9fs_mux_flush_cb(void *a, struct v9fs_fcall *tc, struct v9fs_fcall *rc,
|
|
|
|
int err)
|
2005-09-09 20:04:22 +00:00
|
|
|
{
|
2006-01-08 09:04:58 +00:00
|
|
|
v9fs_mux_req_callback cb;
|
|
|
|
int tag;
|
|
|
|
struct v9fs_mux_data *m;
|
|
|
|
struct v9fs_req *req, *rptr;
|
|
|
|
|
|
|
|
m = a;
|
|
|
|
dprintk(DEBUG_MUX, "mux %p tc %p rc %p err %d oldtag %d\n", m, tc,
|
|
|
|
rc, err, tc->params.tflush.oldtag);
|
|
|
|
|
|
|
|
spin_lock(&m->lock);
|
|
|
|
cb = NULL;
|
|
|
|
tag = tc->params.tflush.oldtag;
|
|
|
|
list_for_each_entry_safe(req, rptr, &m->req_list, req_list) {
|
|
|
|
if (req->tag == tag) {
|
|
|
|
list_del(&req->req_list);
|
|
|
|
if (req->cb) {
|
|
|
|
cb = req->cb;
|
|
|
|
req->cb = NULL;
|
|
|
|
spin_unlock(&m->lock);
|
|
|
|
(*cb) (req->cba, req->tcall, req->rcall,
|
|
|
|
req->err);
|
|
|
|
}
|
|
|
|
kfree(req);
|
|
|
|
wake_up(&m->equeue);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!cb)
|
|
|
|
spin_unlock(&m->lock);
|
|
|
|
|
|
|
|
if (v9fs_check_idpool(tag, &m->tidpool))
|
|
|
|
v9fs_put_idpool(tag, &m->tidpool);
|
|
|
|
|
|
|
|
kfree(tc);
|
|
|
|
kfree(rc);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
v9fs_mux_flush_request(struct v9fs_mux_data *m, struct v9fs_req *req)
|
|
|
|
{
|
|
|
|
struct v9fs_fcall *fc;
|
|
|
|
|
|
|
|
dprintk(DEBUG_MUX, "mux %p req %p tag %d\n", m, req, req->tag);
|
|
|
|
|
|
|
|
fc = kmalloc(sizeof(struct v9fs_fcall), GFP_KERNEL);
|
|
|
|
fc->id = TFLUSH;
|
|
|
|
fc->params.tflush.oldtag = req->tag;
|
|
|
|
|
|
|
|
v9fs_send_request(m, fc, v9fs_mux_flush_cb, m);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
v9fs_mux_rpc_cb(void *a, struct v9fs_fcall *tc, struct v9fs_fcall *rc, int err)
|
|
|
|
{
|
|
|
|
struct v9fs_mux_rpc *r;
|
|
|
|
|
|
|
|
if (err == ERREQFLUSH) {
|
|
|
|
dprintk(DEBUG_MUX, "err req flush\n");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
r = a;
|
|
|
|
dprintk(DEBUG_MUX, "mux %p req %p tc %p rc %p err %d\n", r->m, r->req,
|
|
|
|
tc, rc, err);
|
|
|
|
r->rcall = rc;
|
|
|
|
r->err = err;
|
|
|
|
wake_up(&r->wqueue);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* v9fs_mux_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
|
|
|
|
v9fs_mux_rpc(struct v9fs_mux_data *m, struct v9fs_fcall *tc,
|
|
|
|
struct v9fs_fcall **rc)
|
|
|
|
{
|
|
|
|
int err;
|
|
|
|
unsigned long flags;
|
|
|
|
struct v9fs_req *req;
|
|
|
|
struct v9fs_mux_rpc r;
|
|
|
|
|
|
|
|
r.err = 0;
|
|
|
|
r.rcall = NULL;
|
|
|
|
r.m = m;
|
|
|
|
init_waitqueue_head(&r.wqueue);
|
|
|
|
|
|
|
|
if (rc)
|
|
|
|
*rc = NULL;
|
|
|
|
|
|
|
|
req = v9fs_send_request(m, tc, v9fs_mux_rpc_cb, &r);
|
|
|
|
if (IS_ERR(req)) {
|
|
|
|
err = PTR_ERR(req);
|
|
|
|
dprintk(DEBUG_MUX, "error %d\n", err);
|
|
|
|
return PTR_ERR(req);
|
|
|
|
}
|
|
|
|
|
|
|
|
r.req = req;
|
|
|
|
dprintk(DEBUG_MUX, "mux %p tc %p tag %d rpc %p req %p\n", m, tc,
|
|
|
|
req->tag, &r, req);
|
|
|
|
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) {
|
|
|
|
spin_lock(&m->lock);
|
|
|
|
req->tcall = NULL;
|
|
|
|
req->err = ERREQFLUSH;
|
|
|
|
spin_unlock(&m->lock);
|
|
|
|
|
|
|
|
clear_thread_flag(TIF_SIGPENDING);
|
|
|
|
v9fs_mux_flush_request(m, req);
|
|
|
|
spin_lock_irqsave(¤t->sighand->siglock, flags);
|
|
|
|
recalc_sigpending();
|
|
|
|
spin_unlock_irqrestore(¤t->sighand->siglock, flags);
|
2005-09-09 20:04:22 +00:00
|
|
|
}
|
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
if (!err) {
|
|
|
|
if (r.rcall)
|
|
|
|
dprintk(DEBUG_MUX, "got response id %d tag %d\n",
|
|
|
|
r.rcall->id, r.rcall->tag);
|
|
|
|
|
|
|
|
if (rc)
|
|
|
|
*rc = r.rcall;
|
|
|
|
else
|
|
|
|
kfree(r.rcall);
|
|
|
|
} else {
|
|
|
|
kfree(r.rcall);
|
|
|
|
dprintk(DEBUG_MUX, "got error %d\n", err);
|
|
|
|
if (err > 0)
|
|
|
|
err = -EIO;
|
|
|
|
}
|
|
|
|
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* v9fs_mux_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 v9fs_mux_rpcnb(struct v9fs_mux_data *m, struct v9fs_fcall *tc,
|
|
|
|
v9fs_mux_req_callback cb, void *a)
|
|
|
|
{
|
|
|
|
int err;
|
|
|
|
struct v9fs_req *req;
|
|
|
|
|
|
|
|
req = v9fs_send_request(m, tc, cb, a);
|
|
|
|
if (IS_ERR(req)) {
|
|
|
|
err = PTR_ERR(req);
|
|
|
|
dprintk(DEBUG_MUX, "error %d\n", err);
|
|
|
|
return PTR_ERR(req);
|
|
|
|
}
|
2005-09-09 20:04:22 +00:00
|
|
|
|
2006-01-08 09:04:58 +00:00
|
|
|
dprintk(DEBUG_MUX, "mux %p tc %p tag %d\n", m, tc, req->tag);
|
2005-09-09 20:04:22 +00:00
|
|
|
return 0;
|
|
|
|
}
|
2006-01-08 09:04:58 +00:00
|
|
|
|
|
|
|
/**
|
|
|
|
* v9fs_mux_cancel - cancel all pending requests with error
|
|
|
|
* @m: mux data
|
|
|
|
* @err: error code
|
|
|
|
*/
|
|
|
|
void v9fs_mux_cancel(struct v9fs_mux_data *m, int err)
|
|
|
|
{
|
|
|
|
struct v9fs_req *req, *rtmp;
|
|
|
|
LIST_HEAD(cancel_list);
|
|
|
|
|
|
|
|
dprintk(DEBUG_MUX, "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);
|
|
|
|
}
|
|
|
|
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->cba, req->tcall, req->rcall, req->err);
|
|
|
|
else
|
|
|
|
kfree(req->rcall);
|
|
|
|
|
|
|
|
kfree(req);
|
|
|
|
}
|
|
|
|
|
|
|
|
wake_up(&m->equeue);
|
|
|
|
}
|