To inform later developers how to check the return value of it.
Signed-off-by: Qu Wenruo <wqu@xxxxxxxx>
---
fs/btrfs/extent_io.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 52abe4082680..b28a75546700 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -4890,6 +4890,13 @@ struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
}
#endif
+/*
+ * Allocate an extent buffer structure, with all its pages attached and locked.
+ *
+ * Return valid pointer if nothing goes wrong.
+ * Return PTR_ERR() if failed.
+ * Will never return NULL.
+ */
struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
u64 start)
{
--
2.20.1
