linux-kernel - [PATCH 3.4 056/125] nfs: if we have no valid attrs, then don't declare the attribute cache valid

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Date:   Wed, 12 Oct 2016 20:32:52 +0800
From:   lizf@...nel.org
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Jeff Layton <jlayton@...chiereds.net>,
        Jeff Layton <jeff.layton@...marydata.com>,
        Trond Myklebust <trond.myklebust@...marydata.com>,
        Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 056/125] nfs: if we have no valid attrs, then don't declare the attribute cache valid

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

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

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


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: Zefan Li <lizefan@...wei.com>
---
 fs/nfs/inode.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index a6d5905..bf980b5 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -1458,7 +1458,11 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
 			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)))
-- 
1.9.1