* Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net>
*
* 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.
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
*
*/
-#include <linux/config.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/poll.h>
#include <linux/kthread.h>
#include <linux/idr.h>
+#include <linux/mutex.h>
#include "debug.h"
#include "v9fs.h"
#include "9p.h"
-#include "transport.h"
#include "conv.h"
+#include "transport.h"
#include "mux.h"
#define ERREQFLUSH 1
Wpending = 8, /* can write */
};
+enum {
+ None,
+ Flushing,
+ Flushed,
+};
+
struct v9fs_mux_poll_task;
struct v9fs_req {
+ spinlock_t lock;
int tag;
struct v9fs_fcall *tcall;
struct v9fs_fcall *rcall;
int err;
v9fs_mux_req_callback cb;
void *cba;
+ int flush;
struct list_head req_list;
};
int msize;
unsigned char *extended;
struct v9fs_transport *trans;
- struct v9fs_idpool tidpool;
+ struct v9fs_idpool tagpool;
int err;
wait_queue_head_t equeue;
struct list_head req_list;
struct list_head unsent_req_list;
+ struct v9fs_fcall *rcall;
int rpos;
char *rbuf;
int wpos;
struct v9fs_mux_rpc {
struct v9fs_mux_data *m;
- struct v9fs_req *req;
int err;
+ struct v9fs_fcall *tcall;
struct v9fs_fcall *rcall;
wait_queue_head_t wqueue;
};
static void v9fs_write_work(void *);
static void v9fs_pollwait(struct file *filp, wait_queue_head_t * wait_address,
poll_table * p);
+static u16 v9fs_mux_get_tag(struct v9fs_mux_data *);
+static void v9fs_mux_put_tag(struct v9fs_mux_data *, u16);
-static DECLARE_MUTEX(v9fs_mux_task_lock);
+static DEFINE_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 v9fs_mux_global_init(void)
{
int i;
v9fs_mux_poll_tasks[i].task = NULL;
v9fs_mux_wq = create_workqueue("v9fs");
+ if (!v9fs_mux_wq)
+ return -ENOMEM;
+
+ return 0;
}
void v9fs_mux_global_exit(void)
*
* The current implementation returns sqrt of the number of mounts.
*/
-inline int v9fs_mux_calc_poll_procs(int muxnum)
+static int v9fs_mux_calc_poll_procs(int muxnum)
{
int n;
return n;
}
-static void v9fs_mux_poll_start(struct v9fs_mux_data *m)
+static int v9fs_mux_poll_start(struct v9fs_mux_data *m)
{
int i, n;
struct v9fs_mux_poll_task *vpt, *vptlast;
+ struct task_struct *pproc;
dprintk(DEBUG_MUX, "mux %p muxnum %d procnum %d\n", m, v9fs_mux_num,
v9fs_mux_poll_task_num);
- up(&v9fs_mux_task_lock);
+ mutex_lock(&v9fs_mux_task_lock);
n = v9fs_mux_calc_poll_procs(v9fs_mux_num + 1);
if (n > v9fs_mux_poll_task_num) {
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);
+ pproc = kthread_create(v9fs_poll_proc, vpt,
+ "v9fs-poll");
+
+ if (!IS_ERR(pproc)) {
+ vpt->task = pproc;
+ INIT_LIST_HEAD(&vpt->mux_list);
+ vpt->muxnum = 0;
+ v9fs_mux_poll_task_num++;
+ wake_up_process(vpt->task);
+ }
break;
}
}
}
if (i >= ARRAY_SIZE(v9fs_mux_poll_tasks)) {
+ if (vptlast == NULL)
+ return -ENOMEM;
+
dprintk(DEBUG_MUX, "put in proc %d\n", i);
list_add(&m->mux_list, &vptlast->mux_list);
vptlast->muxnum++;
- m->poll_task = vpt;
+ m->poll_task = vptlast;
memset(&m->poll_waddr, 0, sizeof(m->poll_waddr));
init_poll_funcptr(&m->pt, v9fs_pollwait);
}
v9fs_mux_num++;
- down(&v9fs_mux_task_lock);
+ mutex_unlock(&v9fs_mux_task_lock);
+
+ return 0;
}
static void v9fs_mux_poll_stop(struct v9fs_mux_data *m)
int i;
struct v9fs_mux_poll_task *vpt;
- up(&v9fs_mux_task_lock);
+ mutex_lock(&v9fs_mux_task_lock);
vpt = m->poll_task;
list_del(&m->mux_list);
for(i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) {
v9fs_mux_poll_task_num--;
}
v9fs_mux_num--;
- down(&v9fs_mux_task_lock);
+ mutex_unlock(&v9fs_mux_task_lock);
}
/**
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);
+ m = kmalloc(sizeof(struct v9fs_mux_data), GFP_KERNEL);
if (!m)
return ERR_PTR(-ENOMEM);
m->msize = msize;
m->extended = extended;
m->trans = trans;
- idr_init(&m->tidpool.pool);
- init_MUTEX(&m->tidpool.lock);
+ idr_init(&m->tagpool.pool);
+ init_MUTEX(&m->tagpool.lock);
m->err = 0;
init_waitqueue_head(&m->equeue);
INIT_LIST_HEAD(&m->req_list);
INIT_LIST_HEAD(&m->unsent_req_list);
+ m->rcall = NULL;
m->rpos = 0;
- m->rbuf = (char *)m + sizeof(struct v9fs_mux_data);
+ m->rbuf = NULL;
m->wpos = m->wsize = 0;
- m->wbuf = m->rbuf + msize;
+ m->wbuf = NULL;
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);
+ m->poll_task = NULL;
+ n = v9fs_mux_poll_start(m);
+ if (n)
+ return ERR_PTR(n);
n = trans->poll(trans, &m->pt);
if (n & POLLIN) {
/**
* v9fs_poll_mux - polls a mux and schedules read or write works if necessary
*/
-static inline void v9fs_poll_mux(struct v9fs_mux_data *m)
+static void v9fs_poll_mux(struct v9fs_mux_data *m)
{
int n;
return 0;
}
-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);
- }
-
- return n;
-}
-
/**
* v9fs_write_work - called when a transport can send some data
*/
{
int n, err;
struct v9fs_mux_data *m;
- struct v9fs_req *req, *rtmp;
+ struct v9fs_req *req;
m = a;
return;
}
- 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;
- }
-
- m->wsize = err;
+again:
+ req = list_entry(m->unsent_req_list.next, struct v9fs_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;
+ dump_data(m->wbuf, m->wsize);
spin_unlock(&m->lock);
}
static void process_request(struct v9fs_mux_data *m, struct v9fs_req *req)
{
- int ecode, tag;
- char *ename;
+ int ecode;
+ struct v9fs_str *ename;
- tag = req->tag;
- if (req->rcall->id == RERROR && !req->err) {
+ if (!req->err && req->rcall->id == RERROR) {
ecode = req->rcall->params.rerror.errno;
- ename = req->rcall->params.rerror.error;
+ ename = &req->rcall->params.rerror.error;
- dprintk(DEBUG_MUX, "Rerror %s\n", ename);
+ dprintk(DEBUG_MUX, "Rerror %.*s\n", ename->len, ename->str);
if (*m->extended)
req->err = -ecode;
if (!req->err) {
- req->err = v9fs_errstr2errno(ename);
+ req->err = v9fs_errstr2errno(ename->str, ename->len);
if (!req->err) { /* string match failed */
- dprintk(DEBUG_ERROR, "unknown error: %s\n",
- ename);
+ PRINT_FCALL_ERROR("unknown error", req->rcall);
}
if (!req->err)
if (!req->err)
req->err = -EIO;
}
-
- 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);
}
/**
*/
static void v9fs_read_work(void *a)
{
- int n, err, rcallen;
+ int n, err;
struct v9fs_mux_data *m;
struct v9fs_req *req, *rptr, *rreq;
struct v9fs_fcall *rcall;
+ char *rbuf;
m = a;
rcall = NULL;
dprintk(DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos);
+
+ if (!m->rcall) {
+ m->rcall =
+ kmalloc(sizeof(struct v9fs_fcall) + m->msize, GFP_KERNEL);
+ if (!m->rcall) {
+ err = -ENOMEM;
+ goto error;
+ }
+
+ m->rbuf = (char *)m->rcall + sizeof(struct v9fs_fcall);
+ m->rpos = 0;
+ }
+
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 (m->rpos < n)
break;
- rcallen = n + V9FS_FCALLHDRSZ;
- rcall = kmalloc(rcallen, GFP_KERNEL);
- if (!rcall) {
- err = -ENOMEM;
- goto error;
- }
-
dump_data(m->rbuf, n);
- err = v9fs_deserialize_fcall(m->rbuf, n, rcall, rcallen,
- *m->extended);
+ err =
+ v9fs_deserialize_fcall(m->rbuf, n, m->rcall, *m->extended);
if (err < 0) {
- kfree(rcall);
goto error;
}
+ if ((v9fs_debug_level&DEBUG_FCALL) == DEBUG_FCALL) {
+ char buf[150];
+
+ v9fs_printfcall(buf, sizeof(buf), m->rcall,
+ *m->extended);
+ printk(KERN_NOTICE ">>> %p %s\n", m, buf);
+ }
+
+ rcall = m->rcall;
+ rbuf = m->rbuf;
+ if (m->rpos > n) {
+ m->rcall = kmalloc(sizeof(struct v9fs_fcall) + m->msize,
+ GFP_KERNEL);
+ if (!m->rcall) {
+ err = -ENOMEM;
+ goto error;
+ }
+
+ m->rbuf = (char *)m->rcall + sizeof(struct v9fs_fcall);
+ memmove(m->rbuf, rbuf + n, m->rpos - n);
+ m->rpos -= n;
+ } else {
+ m->rcall = NULL;
+ m->rbuf = NULL;
+ m->rpos = 0;
+ }
+
dprintk(DEBUG_MUX, "mux %p fcall id %d tag %d\n", m, rcall->id,
rcall->tag);
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);
+ if (req->flush != Flushing)
+ list_del(&req->req_list);
break;
}
}
+ spin_unlock(&m->lock);
- if (!req) {
- 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 != RFLUSH)
dprintk(DEBUG_ERROR,
"unexpected response mux %p id %d tag %d\n",
m, rcall->id, rcall->tag);
kfree(rcall);
}
-
- if (m->rpos > n)
- memmove(m->rbuf, m->rbuf + n, m->rpos - n);
- m->rpos -= n;
}
if (!list_empty(&m->req_list)) {
* 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
+ * a guarantee that the request is sent successfully. Can return errors
* that can be retrieved by PTR_ERR macros.
*
* @m: mux data
if (tc->id == TVERSION)
n = V9FS_NOTAG;
else
- n = v9fs_get_idpool(&m->tidpool);
+ n = v9fs_mux_get_tag(m);
if (n < 0)
return ERR_PTR(-ENOMEM);
- tc->tag = n;
+ v9fs_set_tag(tc, n);
+ if ((v9fs_debug_level&DEBUG_FCALL) == DEBUG_FCALL) {
+ char buf[150];
+
+ v9fs_printfcall(buf, sizeof(buf), tc, *m->extended);
+ printk(KERN_NOTICE "<<< %p %s\n", m, buf);
+ }
+
+ 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);
return req;
}
-static inline void
-v9fs_mux_flush_cb(void *a, struct v9fs_fcall *tc, struct v9fs_fcall *rc,
- int err)
+static void v9fs_mux_free_request(struct v9fs_mux_data *m, struct v9fs_req *req)
+{
+ v9fs_mux_put_tag(m, req->tag);
+ kfree(req);
+}
+
+static void v9fs_mux_flush_cb(struct v9fs_req *freq, void *a)
{
v9fs_mux_req_callback cb;
int tag;
struct v9fs_mux_data *m;
- struct v9fs_req *req, *rptr;
+ struct v9fs_req *req, *rreq, *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);
+ dprintk(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);
cb = NULL;
- tag = tc->params.tflush.oldtag;
- list_for_each_entry_safe(req, rptr, &m->req_list, req_list) {
- if (req->tag == tag) {
+ 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);
- 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;
}
}
+ spin_unlock(&m->lock);
- if (!cb)
- spin_unlock(&m->lock);
+ if (req) {
+ spin_lock(&req->lock);
+ req->flush = Flushed;
+ spin_unlock(&req->lock);
- if (v9fs_check_idpool(tag, &m->tidpool))
- v9fs_put_idpool(tag, &m->tidpool);
+ if (req->cb)
+ (*req->cb) (req, req->cba);
+ else
+ kfree(req->rcall);
+
+ wake_up(&m->equeue);
+ }
- kfree(tc);
- kfree(rc);
+ kfree(freq->tcall);
+ kfree(freq->rcall);
+ v9fs_mux_free_request(m, freq);
}
-static void
+static int
v9fs_mux_flush_request(struct v9fs_mux_data *m, struct v9fs_req *req)
{
struct v9fs_fcall *fc;
+ struct v9fs_req *rreq, *rptr;
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;
+ /* if a response was received for a request, do nothing */
+ spin_lock(&req->lock);
+ if (req->rcall || req->err) {
+ spin_unlock(&req->lock);
+ dprintk(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) {
+ dprintk(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 = v9fs_create_tflush(req->tag);
v9fs_send_request(m, fc, v9fs_mux_flush_cb, m);
+ return 1;
}
static void
-v9fs_mux_rpc_cb(void *a, struct v9fs_fcall *tc, struct v9fs_fcall *rc, int err)
+v9fs_mux_rpc_cb(struct v9fs_req *req, void *a)
{
struct v9fs_mux_rpc *r;
- if (err == ERREQFLUSH) {
- dprintk(DEBUG_MUX, "err req flush\n");
- return;
- }
-
+ dprintk(DEBUG_MUX, "req %p r %p\n", req, a);
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;
+ r->rcall = req->rcall;
+ r->err = req->err;
+
+ if (req->flush!=None && !req->err)
+ r->err = -ERESTARTSYS;
+
wake_up(&r->wqueue);
}
v9fs_mux_rpc(struct v9fs_mux_data *m, struct v9fs_fcall *tc,
struct v9fs_fcall **rc)
{
- int err;
+ int err, sigpending;
unsigned long flags;
struct v9fs_req *req;
struct v9fs_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 = 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);
+ return err;
}
- 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);
+ if (v9fs_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;
+ }
- clear_thread_flag(TIF_SIGPENDING);
- v9fs_mux_flush_request(m, req);
+ if (sigpending) {
spin_lock_irqsave(¤t->sighand->siglock, flags);
recalc_sigpending();
spin_unlock_irqrestore(¤t->sighand->siglock, flags);
}
- 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 {
+ if (rc)
+ *rc = r.rcall;
+ else
kfree(r.rcall);
- dprintk(DEBUG_MUX, "got error %d\n", err);
- if (err > 0)
- err = -EIO;
- }
+
+ v9fs_mux_free_request(m, req);
+ if (err > 0)
+ err = -EIO;
return err;
}
+#if 0
/**
* v9fs_mux_rpcnb - sends 9P request without waiting for response.
* @m: mux data
dprintk(DEBUG_MUX, "mux %p tc %p tag %d\n", m, tc, req->tag);
return 0;
}
+#endif /* 0 */
/**
* v9fs_mux_cancel - cancel all pending requests with error
struct v9fs_req *req, *rtmp;
LIST_HEAD(cancel_list);
- dprintk(DEBUG_MUX, "mux %p err %d\n", m, err);
+ dprintk(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) {
req->err = err;
if (req->cb)
- (*req->cb) (req->cba, req->tcall, req->rcall, req->err);
+ (*req->cb) (req, req->cba);
else
kfree(req->rcall);
-
- kfree(req);
}
wake_up(&m->equeue);
}
+
+static u16 v9fs_mux_get_tag(struct v9fs_mux_data *m)
+{
+ int tag;
+
+ tag = v9fs_get_idpool(&m->tagpool);
+ if (tag < 0)
+ return V9FS_NOTAG;
+ else
+ return (u16) tag;
+}
+
+static void v9fs_mux_put_tag(struct v9fs_mux_data *m, u16 tag)
+{
+ if (tag != V9FS_NOTAG && v9fs_check_idpool(tag, &m->tagpool))
+ v9fs_put_idpool(tag, &m->tagpool);
+}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff