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The only generic interface to execute asynchronously in the BH context is tasklet; however, it's marked deprecated and has some design flaws. To replace tasklets, BH workqueue support was recently added. A BH workqueue behaves similarly to regular workqueues except that the queued work items are executed in the BH context. This commit converts dm-crypt from tasklet to BH workqueue. It backfills tasklet code that was removed with commit0a9bab391e("dm-crypt, dm-verity: disable tasklets") and tweaks to use BH workqueue. Like a regular workqueue, a BH workqueue allows freeing the currently executing work item. Converting from tasklet to BH workqueue removes the need for deferring bio_endio() again to a work item, which was buggy anyway. I tested this lightly with "--perf-no_read_workqueue --perf-no_write_workqueue" + some code modifications, but would really -appreciate if someone who knows the code base better could take a look. Signed-off-by: Tejun Heo <tj@kernel.org> Link: http://lkml.kernel.org/r/82b964f0-c2c8-a2c6-5b1f-f3145dc2c8e5@redhat.com [snitzer: rebase ontop of commit0a9bab391ereduced this commit's changes] Signed-off-by: Mike Snitzer <snitzer@kernel.org>
3728 lines
96 KiB
3728 lines
96 KiB