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;
};
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 process_request(struct v9fs_mux_data *m, struct v9fs_req *req)
{
- int ecode, tag;
+ int ecode;
struct v9fs_str *ename;
- tag = req->tag;
if (!req->err && req->rcall->id == RERROR) {
ecode = req->rcall->params.rerror.errno;
ename = &req->rcall->params.rerror.error;
if (!req->err)
req->err = -EIO;
}
-
- if (req->err == ERREQFLUSH)
- return;
-
- if (req->cb) {
- 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);
-
- v9fs_mux_put_tag(m, tag);
-
- wake_up(&m->equeue);
- kfree(req);
}
/**
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",
* 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
return ERR_PTR(-ENOMEM);
v9fs_set_tag(tc, n);
-
if ((v9fs_debug_level&DEBUG_FCALL) == DEBUG_FCALL) {
char buf[150];
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 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 (req->cb)
+ (*req->cb) (req, req->cba);
+ else
+ kfree(req->rcall);
+
+ wake_up(&m->equeue);
+ }
- v9fs_mux_put_tag(m, tag);
- 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);
+ /* 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) {
- kfree(rc);
- 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);
+ }
+ 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;
}
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);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff