block: extend queue bypassing to cover blkcg policies

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Extend queue bypassing such that dying queue is always bypassing and
blk-throttle is drained on bypass.  With blkcg policies updated to
test blk_queue_bypass() instead of blk_queue_dead(), this ensures that
no bio or request is held by or going through blkcg policies on a
bypassing queue.

This will be used to implement blkg cleanup on elevator switches and
policy changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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This commit is contained in:

Tejun Heo 2012-03-05 13:14:59 -08:00 • committed by Jens Axboe

parent d732580b4e

commit 6ecf23afab

2 changed files with 10 additions and 6 deletions

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12

block/blk-core.c

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4

block/blk-throttle.c

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