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NFS: Add an iocounter wait function for async RPC tasks

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By sleeping on a new NFS Unlock-On-Close waitqueue, rpc tasks may wait for
a lock context's iocounter to reach zero.  The rpc waitqueue is only woken
when the open_context has the NFS_CONTEXT_UNLOCK flag set in order to
mitigate spurious wake-ups for any iocounter reaching zero.

Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Benjamin Coddington
2017-04-11 12:50:10 -04:00
committed by Trond Myklebust
parent 50f2112cf7
commit 7d6ddf88c4
5 changed files with 37 additions and 1 deletions
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include/linux/nfs_fs.h
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@@ -76,6 +76,7 @@ struct nfs_open_context {
#define NFS_CONTEXT_ERROR_WRITE (0)
#define NFS_CONTEXT_RESEND_WRITES (1)
#define NFS_CONTEXT_BAD (2)
#define NFS_CONTEXT_UNLOCK (3)
int error;
struct list_head list;