NFS: Optimise away the sigmask code in aio/dio reads and writes
There are no interruptible waits for asynchronous RPC tasks, so we don't
need to wrap calls to rpc_run_task() with an
rpc_clnt_sigmask/rpc_clnt_unsigmask pair.
Instead we can wrap the wait_for_completion_interruptible() in
nfs_direct_wait(). This means that we completely optimise away sigmask
setting for the case of non-blocking aio/dio.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index eadd87f..f8e165c 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -188,12 +188,17 @@
static ssize_t nfs_direct_wait(struct nfs_direct_req *dreq)
{
ssize_t result = -EIOCBQUEUED;
+ struct rpc_clnt *clnt;
+ sigset_t oldset;
/* Async requests don't wait here */
if (dreq->iocb)
goto out;
+ clnt = NFS_CLIENT(dreq->inode);
+ rpc_clnt_sigmask(clnt, &oldset);
result = wait_for_completion_interruptible(&dreq->completion);
+ rpc_clnt_sigunmask(clnt, &oldset);
if (!result)
result = dreq->error;
@@ -403,9 +408,7 @@
unsigned long nr_segs, loff_t pos)
{
ssize_t result = 0;
- sigset_t oldset;
struct inode *inode = iocb->ki_filp->f_mapping->host;
- struct rpc_clnt *clnt = NFS_CLIENT(inode);
struct nfs_direct_req *dreq;
dreq = nfs_direct_req_alloc();
@@ -417,11 +420,9 @@
if (!is_sync_kiocb(iocb))
dreq->iocb = iocb;
- rpc_clnt_sigmask(clnt, &oldset);
result = nfs_direct_read_schedule_iovec(dreq, iov, nr_segs, pos);
if (!result)
result = nfs_direct_wait(dreq);
- rpc_clnt_sigunmask(clnt, &oldset);
nfs_direct_req_release(dreq);
return result;
@@ -816,9 +817,7 @@
size_t count)
{
ssize_t result = 0;
- sigset_t oldset;
struct inode *inode = iocb->ki_filp->f_mapping->host;
- struct rpc_clnt *clnt = NFS_CLIENT(inode);
struct nfs_direct_req *dreq;
size_t wsize = NFS_SERVER(inode)->wsize;
int sync = NFS_UNSTABLE;
@@ -836,11 +835,9 @@
if (!is_sync_kiocb(iocb))
dreq->iocb = iocb;
- rpc_clnt_sigmask(clnt, &oldset);
result = nfs_direct_write_schedule_iovec(dreq, iov, nr_segs, pos, sync);
if (!result)
result = nfs_direct_wait(dreq);
- rpc_clnt_sigunmask(clnt, &oldset);
nfs_direct_req_release(dreq);
return result;