f2fs: avoid deadlock in f2fs_shrink_extent_tree
While handling extent trees, we can enter into a reclaiming path anytime. If it tries to release some extent nodes in the same extent tree, write_lock(&et->lock) would be hanged. In order to avoid the deadlock, we can just skip it. Note that, if it is an unreferenced tree, we should get write_lock(&et->lock) successfully and release all of therein nodes. Reviewed-by: NChao Yu <chao2.yu@samsung.com> Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>
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