ovl: Add helper ovl_inode_realdata()

Add an helper to retrieve real data inode associated with overlay inode.
This helper will ignore all metacopy inodes and will return only the real
inode which has data.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c
index 63311c536216..73939e08d8bf 100644
--- a/fs/overlayfs/util.c
+++ b/fs/overlayfs/util.c
@@ -256,6 +256,18 @@ struct inode *ovl_inode_lowerdata(struct inode *inode)
 	return OVL_I(inode)->lowerdata ?: ovl_inode_lower(inode);
 }
 
+/* Return real inode which contains data. Does not return metacopy inode */
+struct inode *ovl_inode_realdata(struct inode *inode)
+{
+	struct inode *upperinode;
+
+	upperinode = ovl_inode_upper(inode);
+	if (upperinode && ovl_has_upperdata(inode))
+		return upperinode;
+
+	return ovl_inode_lowerdata(inode);
+}
+
 struct ovl_dir_cache *ovl_dir_cache(struct inode *inode)
 {
 	return OVL_I(inode)->cache;