[PATCH] f2fs: check the level before calling get_nid function

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The caller of get_nid should be careful not to put lower value than
NODE_DIR1_BLOCK in case of level is zero.

Signed-off-by: Changman Lee <cm224.lee@xxxxxxxxxxx>
---
 fs/f2fs/node.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index e275218..764c1d8 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -403,7 +403,8 @@ int get_dnode_of_data(struct dnode_of_data *dn, pgoff_t index, int ro)
 		return PTR_ERR(npage[0]);
 
 	parent = npage[0];
-	nids[1] = get_nid(parent, offset[0], true);
+	if (level != 0)
+		nids[1] = get_nid(parent, offset[0], true);
 	dn->inode_page = npage[0];
 	dn->inode_page_locked = true;
 
-- 
1.7.10.4

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