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[5.4,14/72] NFS: Zero-stateid SETATTR should first return delegation

Message ID 20200921163122.552516178@linuxfoundation.org
State Superseded
Headers show
Series None | expand

Commit Message

gregkh@linuxfoundation.org Sept. 21, 2020, 4:30 p.m. UTC 
From: Chuck Lever <chuck.lever@oracle.com>

[ Upstream commit 644c9f40cf71969f29add32f32349e71d4995c0b ]

If a write delegation isn't available, the Linux NFS client uses
a zero-stateid when performing a SETATTR.

NFSv4.0 provides no mechanism for an NFS server to match such a
request to a particular client. It recalls all delegations for that
file, even delegations held by the client issuing the request. If
that client happens to hold a read delegation, the server will
recall it immediately, resulting in an NFS4ERR_DELAY/CB_RECALL/
DELEGRETURN sequence.

Optimize out this pipeline bubble by having the client return any
delegations it may hold on a file before it issues a
SETATTR(zero-stateid) on that file.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/nfs/nfs4proc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
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Patch

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 16414ae02c089..00435556db0ce 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -3257,8 +3257,10 @@  static int _nfs4_do_setattr(struct inode *inode,
 
 	/* Servers should only apply open mode checks for file size changes */
 	truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
-	if (!truncate)
+	if (!truncate) {
+		nfs4_inode_make_writeable(inode);
 		goto zero_stateid;
+	}
 
 	if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
 		/* Use that stateid */