NFSv4.1: Ask for no delegation on OPEN if using O_DIRECT

If we're using NFSv4.1, then we have the ability to let the server know
whether or not we believe that returning a delegation as part of our OPEN
request would be useful.
The feature needs to be used with care, since the client sending the request
doesn't necessarily know how other clients are using that file, and how
they may be affected by the delegation.
For this reason, our initial use of the feature will be to let the server
know when the client believes that handing out a delegation would not be
useful.
The first application for this function is when opening the file using
O_DIRECT.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 81401125ab2d..2c35e2affa6f 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -326,6 +326,7 @@ struct nfs_openargs {
 	struct nfs_seqid *	seqid;
 	int			open_flags;
 	fmode_t			fmode;
+	u32			share_access;
 	u32			access;
 	__u64                   clientid;
 	struct stateowner_id	id;
@@ -393,6 +394,7 @@ struct nfs_closeargs {
 	nfs4_stateid 		stateid;
 	struct nfs_seqid *	seqid;
 	fmode_t			fmode;
+	u32			share_access;
 	const u32 *		bitmask;
 };