btrfs: fix truncate throttling
We have a bunch of magic to make sure we're throttling delayed refs when truncating a file. Now that we have a delayed refs rsv and a mechanism for refilling that reserve simply use that instead of all of this magic. Reviewed-by: NNikolay Borisov <nborisov@suse.com> Signed-off-by: NJosef Bacik <josef@toxicpanda.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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