f2fs: set page private for inmemory pages for truncation

The inmemory pages should be handled by invalidate_page since it needs to be
released int the truncation path.

Signed-off-by: Jaegeuk Kim <[email protected]>
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index c79d67e..3ebcf96 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -180,6 +180,8 @@
 	struct inmem_pages *new;
 	int err;
 
+	SetPagePrivate(page);
+
 	new = f2fs_kmem_cache_alloc(inmem_entry_slab, GFP_NOFS);
 
 	/* add atomic page indices to the list */