linux-kernel - [PATCH 3.2 36/77] nfs: if we have no valid attrs, then don't declare the attribute cache valid

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Message-ID: <lsq.1450971462.977810066@decadent.org.uk>
Date:	Thu, 24 Dec 2015 15:37:42 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Jeff Layton" <jeff.layton@...marydata.com>,
	"Trond Myklebust" <trond.myklebust@...marydata.com>,
	"Steve French" <steve.french@...marydata.com>,
	"Jeff Layton" <jlayton@...chiereds.net>
Subject: [PATCH 3.2 36/77] nfs: if we have no valid attrs, then don't
 declare the attribute cache valid

3.2.75-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Jeff Layton <jlayton@...chiereds.net>

commit c812012f9ca7cf89c9e1a1cd512e6c3b5be04b85 upstream.

If we pass in an empty nfs_fattr struct to nfs_update_inode, it will
(correctly) not update any of the attributes, but it then clears the
NFS_INO_INVALID_ATTR flag, which indicates that the attributes are
up to date. Don't clear the flag if the fattr struct has no valid
attrs to apply.

Reviewed-by: Steve French <steve.french@...marydata.com>
Signed-off-by: Jeff Layton <jeff.layton@...marydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@...marydata.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/nfs/inode.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -1389,7 +1389,11 @@ static int nfs_update_inode(struct inode
 			nfsi->attrtimeo_timestamp = now;
 		}
 	}
-	invalid &= ~NFS_INO_INVALID_ATTR;
+
+	/* Don't declare attrcache up to date if there were no attrs! */
+	if (fattr->valid != 0)
+		invalid &= ~NFS_INO_INVALID_ATTR;
+
 	/* Don't invalidate the data if we were to blame */
 	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
 				|| S_ISLNK(inode->i_mode)))

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