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9P: Add cancelled() to the transport functions.

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RDMA needs to post a buffer for each incoming reply.
Hence it needs to keep count of these and needs to be
aware of whether a flushed request has received a reply
or not.

This patch adds the cancelled() callback to the transport modules.
It is called when RFLUSH has been received and that the corresponding
request will never receive a reply.

Signed-off-by: Simon Derr <[email protected]>
Signed-off-by: Eric Van Hensbergen <[email protected]>
This commit is contained in:
Simon Derr 2013-06-21 15:32:43 +02:00 • committed by Eric Van Hensbergen
commit 80b45261a0
3 changed files with 23 additions and 3 deletions
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12
net/9p/client.c
View file

@ -658,12 +658,18 @@ static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
/*
* if we haven't received a response for oldreq,
* remove it from the list.
* remove it from the list, and notify the transport
* layer that the reply will never arrive.
*/
spin_lock(&c->lock);
if (oldreq->status == REQ_STATUS_FLSH)
if (oldreq->status == REQ_STATUS_FLSH) {
list_del(&oldreq->req_list);
spin_unlock(&c->lock);
spin_unlock(&c->lock);
if (c->trans_mod->cancelled)
c->trans_mod->cancelled(c, req);
} else {
spin_unlock(&c->lock);
}
p9_free_req(c, req);
return 0;

11
net/9p/trans_rdma.c
View file

@ -588,6 +588,17 @@ static int rdma_cancel(struct p9_client *client, struct p9_req_t *req)
return 1;
}
/* A request has been fully flushed without a reply.
* That means we have posted one buffer in excess.
*/
static int rdma_cancelled(struct p9_client *client, struct p9_req_t *req)
{
struct p9_trans_rdma *rdma = client->trans;
atomic_inc(&rdma->excess_rc);
return 0;
}
/**
* trans_create_rdma - Transport method for creating atransport instance
* @client: client instance