Btrfs: kill some BUG_ONs() in the find_parent_nodes()
The reason that BUG_ON() happens in these places is just because of ENOMEM. We try ro return ENOMEM rather than trigger BUG_ON(), the caller will abort the transaction thus avoiding the kernel panic. Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com> Reviewed-by: Miao Xie <miaox@cn.fujitsu.com> Reviewed-by: Jan Schmidt <list.btrfs@jan-o-sch.net> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
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