NFS: Don't force page cache revalidations when holding a delegation

If we're holding a delegation, then we already know that our
page cache is valid.

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

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 59a12c6..fed27c0 100644 (file)
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -870,6 +870,15 @@ static int nfs_invalidate_mapping(struct inode *inode, struct address_space *map
        return 0;
 }
 
+static bool nfs_mapping_need_revalidate_inode(struct inode *inode)
+{
+       if (nfs_have_delegated_attributes(inode))
+               return false;
+       return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE)
+               || nfs_attribute_timeout(inode)
+               || NFS_STALE(inode);
+}
+
 /**
  * nfs_revalidate_mapping - Revalidate the pagecache
  * @inode - pointer to host inode
@@ -880,9 +889,7 @@ int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
        struct nfs_inode *nfsi = NFS_I(inode);
        int ret = 0;
 
-       if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
-                       || nfs_attribute_cache_expired(inode)
-                       || NFS_STALE(inode)) {
+       if (nfs_mapping_need_revalidate_inode(inode)) {
                ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
                if (ret < 0)
                        goto out;