NFSv4.1/pnfs: Don't ask for a read layout for an empty file.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 4eec540de9ea06bd95f6c6f0c9395c1e59214823..c4f918eca3d26d310fa65cdf9a11cec7c586bb45 100644 (file)
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -1494,6 +1494,9 @@ pnfs_update_layout(struct inode *ino,
        if (!pnfs_enabled_sb(NFS_SERVER(ino)))
                goto out;
 
+       if (iomode == IOMODE_READ && i_size_read(ino) == 0)
+               goto out;
+
        if (pnfs_within_mdsthreshold(ctx, ino, iomode))
                goto out;