Commit 63ab46ab authored by Chuck Lever's avatar Chuck Lever Committed by Trond Myklebust
Browse files

NFS: create common routine for handling direct I/O completion



Factor out the common piece of completing an NFS direct I/O request.

Test plan:
Compile kernel with CONFIG_NFS and CONFIG_NFS_DIRECTIO enabled.
Signed-off-by: default avatarChuck Lever <cel@netapp.com>
Signed-off-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
parent 93619e59
......@@ -200,6 +200,30 @@ out:
return (ssize_t) result;
}
/*
* We must hold a reference to all the pages in this direct read request
* until the RPCs complete. This could be long *after* we are woken up in
* nfs_direct_wait (for instance, if someone hits ^C on a slow server).
*
* In addition, synchronous I/O uses a stack-allocated iocb. Thus we
* can't trust the iocb is still valid here if this is a synchronous
* request. If the waiter is woken prematurely, the iocb is long gone.
*/
static void nfs_direct_complete(struct nfs_direct_req *dreq)
{
nfs_free_user_pages(dreq->pages, dreq->npages, 1);
if (dreq->iocb) {
long res = atomic_read(&dreq->error);
if (!res)
res = atomic_read(&dreq->count);
aio_complete(dreq->iocb, res, 0);
} else
wake_up(&dreq->wait);
kref_put(&dreq->kref, nfs_direct_req_release);
}
/*
* Note we also set the number of requests we have in the dreq when we are
* done. This prevents races with I/O completion so we will always wait
......@@ -245,15 +269,6 @@ static struct nfs_direct_req *nfs_direct_read_alloc(size_t nbytes, size_t rsize)
return dreq;
}
/*
* We must hold a reference to all the pages in this direct read request
* until the RPCs complete. This could be long *after* we are woken up in
* nfs_direct_wait (for instance, if someone hits ^C on a slow server).
*
* In addition, synchronous I/O uses a stack-allocated iocb. Thus we
* can't trust the iocb is still valid here if this is a synchronous
* request. If the waiter is woken prematurely, the iocb is long gone.
*/
static void nfs_direct_read_result(struct rpc_task *task, void *calldata)
{
struct nfs_read_data *data = calldata;
......@@ -266,17 +281,8 @@ static void nfs_direct_read_result(struct rpc_task *task, void *calldata)
else
atomic_set(&dreq->error, task->tk_status);
if (unlikely(atomic_dec_and_test(&dreq->complete))) {
nfs_free_user_pages(dreq->pages, dreq->npages, 1);
if (dreq->iocb) {
long res = atomic_read(&dreq->error);
if (!res)
res = atomic_read(&dreq->count);
aio_complete(dreq->iocb, res, 0);
} else
wake_up(&dreq->wait);
kref_put(&dreq->kref, nfs_direct_req_release);
}
if (unlikely(atomic_dec_and_test(&dreq->complete)))
nfs_direct_complete(dreq);
}
static const struct rpc_call_ops nfs_read_direct_ops = {
......
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