NFS: Don't do a full flush to disk on close() if we hold a delegation

If we hold a delegation then we know that it should be safe to continue
to cache the data beyond the close(). However since the process that wrote
the data may die after close(), we may still want to send the data to
server before those RPCSEC_GSS credentials expire. We therefore compromise
by starting writeback to the server, but don't wait for completion.

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

diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index aa9b709fd328d7178cd1c4bdb417fb6f454472af..8eda8a6644c3d918230a80c3f78e3aed5e09b057 100644 (file)
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -174,6 +174,13 @@ nfs_file_flush(struct file *file, fl_owner_t id)
        if ((file->f_mode & FMODE_WRITE) == 0)
                return 0;
 
+       /*
+        * If we're holding a write delegation, then just start the i/o
+        * but don't wait for completion (or send a commit).
+        */
+       if (nfs_have_delegation(inode, FMODE_WRITE))
+               return filemap_fdatawrite(file->f_mapping);
+
        /* Flush writes to the server and return any errors */
        return vfs_fsync(file, 0);
 }