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block: add a non-queueable flush flag

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flush request isn't queueable in some drives. Add a flag to let driver
notify block layer about this. We can optimize flush performance with the
knowledge.

Stable: 2.6.39 only

Cc: [email protected]
Signed-off-by: Shaohua Li <[email protected]>
Acked-by: Tejun Heo <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
[email protected] 2011-05-06 11:34:32 -06:00 • committed by Jens Axboe
commit f387693095
2 changed files with 13 additions and 0 deletions
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6
block/blk-settings.c
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@ -790,6 +790,12 @@ void blk_queue_flush(struct request_queue *q, unsigned int flush)
}
EXPORT_SYMBOL_GPL(blk_queue_flush);
void blk_queue_flush_queueable(struct request_queue *q, bool queueable)
{
q->flush_not_queueable = !queueable;
}
EXPORT_SYMBOL_GPL(blk_queue_flush_queueable);
static int __init blk_settings_init(void)
{
blk_max_low_pfn = max_low_pfn - 1;