[PATCH 2.6.32 18/42] nfs: if we have no valid attrs, then dont declare the attribute cache valid

From: Willy Tarreau
Date: Sat Jan 23 2016 - 09:47:43 EST


2.6.32-longterm review patch. If anyone has any objections, please let me know.

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

From: Jeff Layton <jlayton@xxxxxxxxxxxxxxx>

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@xxxxxxxxxxxxxxx>
Signed-off-by: Jeff Layton <jeff.layton@xxxxxxxxxxxxxxx>
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
(cherry picked from commit ddab0155aa9589600861e3f65d505982b719496a)
Signed-off-by: Willy Tarreau <w@xxxxxx>
---
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 bfaef7b..9129a32 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -1333,7 +1333,11 @@ 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)))
--
1.7.12.2.21.g234cd45.dirty