Btrfs: remove no longer used stuff for tracking pending ordered extents
Tracking pending ordered extents per transaction was introduced in commit 50d9aa99 ("Btrfs: make sure logged extents complete in the current transaction V3") and later updated in commit 161c3549 ("Btrfs: change how we wait for pending ordered extents"). However now that on fsync we always wait for ordered extents to complete before logging, done in commit 5636cf7d ("btrfs: remove the logged extents infrastructure"), we no longer need the stuff to track for pending ordered extents, which was not completely removed in the mentioned commit. So remove the remaining of the pending ordered extents infrastructure. Reviewed-by: Liu Bo <bo.liu@linux.alibaba.com> Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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