diff options
-rw-r--r-- | block/blk-settings.c | 21 | ||||
-rw-r--r-- | drivers/md/dm-stripe.c | 2 | ||||
-rw-r--r-- | include/linux/blkdev.h | 1 |
3 files changed, 22 insertions, 2 deletions
diff --git a/block/blk-settings.c b/block/blk-settings.c index 476d87065073..83413ff83739 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c | |||
@@ -428,6 +428,25 @@ void blk_queue_io_min(struct request_queue *q, unsigned int min) | |||
428 | EXPORT_SYMBOL(blk_queue_io_min); | 428 | EXPORT_SYMBOL(blk_queue_io_min); |
429 | 429 | ||
430 | /** | 430 | /** |
431 | * blk_limits_io_opt - set optimal request size for a device | ||
432 | * @limits: the queue limits | ||
433 | * @opt: smallest I/O size in bytes | ||
434 | * | ||
435 | * Description: | ||
436 | * Storage devices may report an optimal I/O size, which is the | ||
437 | * device's preferred unit for sustained I/O. This is rarely reported | ||
438 | * for disk drives. For RAID arrays it is usually the stripe width or | ||
439 | * the internal track size. A properly aligned multiple of | ||
440 | * optimal_io_size is the preferred request size for workloads where | ||
441 | * sustained throughput is desired. | ||
442 | */ | ||
443 | void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt) | ||
444 | { | ||
445 | limits->io_opt = opt; | ||
446 | } | ||
447 | EXPORT_SYMBOL(blk_limits_io_opt); | ||
448 | |||
449 | /** | ||
431 | * blk_queue_io_opt - set optimal request size for the queue | 450 | * blk_queue_io_opt - set optimal request size for the queue |
432 | * @q: the request queue for the device | 451 | * @q: the request queue for the device |
433 | * @opt: optimal request size in bytes | 452 | * @opt: optimal request size in bytes |
@@ -442,7 +461,7 @@ EXPORT_SYMBOL(blk_queue_io_min); | |||
442 | */ | 461 | */ |
443 | void blk_queue_io_opt(struct request_queue *q, unsigned int opt) | 462 | void blk_queue_io_opt(struct request_queue *q, unsigned int opt) |
444 | { | 463 | { |
445 | q->limits.io_opt = opt; | 464 | blk_limits_io_opt(&q->limits, opt); |
446 | } | 465 | } |
447 | EXPORT_SYMBOL(blk_queue_io_opt); | 466 | EXPORT_SYMBOL(blk_queue_io_opt); |
448 | 467 | ||
diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c index fde658ccbcec..e0efc1adcaff 100644 --- a/drivers/md/dm-stripe.c +++ b/drivers/md/dm-stripe.c | |||
@@ -336,7 +336,7 @@ static void stripe_io_hints(struct dm_target *ti, | |||
336 | unsigned chunk_size = (sc->chunk_mask + 1) << 9; | 336 | unsigned chunk_size = (sc->chunk_mask + 1) << 9; |
337 | 337 | ||
338 | blk_limits_io_min(limits, chunk_size); | 338 | blk_limits_io_min(limits, chunk_size); |
339 | limits->io_opt = chunk_size * sc->stripes; | 339 | blk_limits_io_opt(limits, chunk_size * sc->stripes); |
340 | } | 340 | } |
341 | 341 | ||
342 | static struct target_type stripe_target = { | 342 | static struct target_type stripe_target = { |
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 8bf1a10e4d88..86c2bdff3b89 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h | |||
@@ -935,6 +935,7 @@ extern void blk_queue_alignment_offset(struct request_queue *q, | |||
935 | unsigned int alignment); | 935 | unsigned int alignment); |
936 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); | 936 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
937 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); | 937 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
938 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); | ||
938 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); | 939 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
939 | extern void blk_set_default_limits(struct queue_limits *lim); | 940 | extern void blk_set_default_limits(struct queue_limits *lim); |
940 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, | 941 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |