diff options
Diffstat (limited to 'block/blk-settings.c')
-rw-r--r-- | block/blk-settings.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/block/blk-settings.c b/block/blk-settings.c index 315b88c8cbbb..701859fb9647 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c | |||
@@ -792,6 +792,26 @@ void blk_queue_update_dma_alignment(struct request_queue *q, int mask) | |||
792 | } | 792 | } |
793 | EXPORT_SYMBOL(blk_queue_update_dma_alignment); | 793 | EXPORT_SYMBOL(blk_queue_update_dma_alignment); |
794 | 794 | ||
795 | /** | ||
796 | * blk_queue_flush - configure queue's cache flush capability | ||
797 | * @q: the request queue for the device | ||
798 | * @flush: 0, REQ_FLUSH or REQ_FLUSH | REQ_FUA | ||
799 | * | ||
800 | * Tell block layer cache flush capability of @q. If it supports | ||
801 | * flushing, REQ_FLUSH should be set. If it supports bypassing | ||
802 | * write cache for individual writes, REQ_FUA should be set. | ||
803 | */ | ||
804 | void blk_queue_flush(struct request_queue *q, unsigned int flush) | ||
805 | { | ||
806 | WARN_ON_ONCE(flush & ~(REQ_FLUSH | REQ_FUA)); | ||
807 | |||
808 | if (WARN_ON_ONCE(!(flush & REQ_FLUSH) && (flush & REQ_FUA))) | ||
809 | flush &= ~REQ_FUA; | ||
810 | |||
811 | q->flush_flags = flush & (REQ_FLUSH | REQ_FUA); | ||
812 | } | ||
813 | EXPORT_SYMBOL_GPL(blk_queue_flush); | ||
814 | |||
795 | static int __init blk_settings_init(void) | 815 | static int __init blk_settings_init(void) |
796 | { | 816 | { |
797 | blk_max_low_pfn = max_low_pfn - 1; | 817 | blk_max_low_pfn = max_low_pfn - 1; |