blk-mq: refactor request insertion/merging
Refactor the logic around adding a new bio to a software queue,
so we nest the ctx->lock where we really need it (merge and
insertion) and don't hold it when we don't (init and IO start
accounting).
Signed-off-by:
Jens Axboe <axboe@fb.com>
parent
98bc1f27
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