NFS: Always trust the PageUptodate flag when we have a delegation

We can always use the optimal full page write if we know that we
hold a delegation.

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

1 files changed, 7 insertions, 3 deletions

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index d1e4f81ba057..6f263daac748 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -850,10 +850,14 @@ int nfs_flush_incompatible(struct file *file, struct page *page)
  * the PageUptodate() flag. In this case, we will need to turn off
  * write optimisations that depend on the page contents being correct.
  */
-static int nfs_write_pageuptodate(struct page *page, struct inode *inode)
+static bool nfs_write_pageuptodate(struct page *page, struct inode *inode)
 {
-        return PageUptodate(page) &&
-                !(NFS_I(inode)->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA));
+        if (nfs_have_delegated_attributes(inode))
+                goto out;
+        if (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE)
+                return false;
+out:
+        return PageUptodate(page) != 0;
 }
 
 /*