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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2008-01-15 14:17:12 -0500 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2008-01-30 02:06:10 -0500 |
| commit | f3c391e89c92651105364c6645244118ec9b3952 (patch) | |
| tree | 248ea7f3f5244b4f00acc8b1f36c57324b61ff31 /fs/nfs/direct.c | |
| parent | 34f5b4662bf4b54f22b32ce76ce70eccd7ebc68a (diff) | |
| download | lwn-f3c391e89c92651105364c6645244118ec9b3952.tar.gz lwn-f3c391e89c92651105364c6645244118ec9b3952.zip | |
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>
Diffstat (limited to 'fs/nfs/direct.c')
| -rw-r--r-- | fs/nfs/direct.c | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c index eadd87f7159f..f8e165c7d5a6 100644 --- a/fs/nfs/direct.c +++ b/fs/nfs/direct.c @@ -188,12 +188,17 @@ static void nfs_direct_req_release(struct nfs_direct_req *dreq) 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 @@ static ssize_t nfs_direct_read(struct kiocb *iocb, const struct iovec *iov, 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 @@ static ssize_t nfs_direct_read(struct kiocb *iocb, const struct iovec *iov, 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 @@ static ssize_t nfs_direct_write(struct kiocb *iocb, const struct iovec *iov, 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 @@ static ssize_t nfs_direct_write(struct kiocb *iocb, const struct iovec *iov, 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; |