From: Trond Myklebust <Trond.Myklebust@netapp.com>
Date: Tue, 10 Jun 2008 22:31:02 +0000 (-0400)
Subject: NFS: do_setlk(): don't flush caches when we have a delegation
X-Git-Tag: firefly_0821_release~19647^2~1^2~57
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=b5418383ef13f70528281546d02c15edc03d8567;p=firefly-linux-kernel-4.4.55.git

NFS: do_setlk(): don't flush caches when we have a delegation

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
---

diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index 7ac89a845a5e..0213c21038fa 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -602,7 +602,8 @@ static int do_setlk(struct file *filp, int cmd, struct file_lock *fl)
 	 * This makes locking act as a cache coherency point.
 	 */
 	nfs_sync_mapping(filp->f_mapping);
-	nfs_zap_caches(inode);
+	if (!nfs_have_delegation(inode, FMODE_READ))
+		nfs_zap_caches(inode);
 out:
 	return status;
 }