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Commit 3c5820c743479285ce2678fd3c12b1fd39fe998f

Authored by Martin K. Petersen
Committed by Jens Axboe
1 parent 06d2188644
Exists in master and in 7 other branches imx_3.0.35_4.1.0, imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga, smarc-l5.0.0_1.0.0-ga

block: Optimal I/O limit wrapper 

Implement blk_limits_io_opt() and make blk_queue_io_opt() a wrapper
around it. DM needs this to avoid poking at the queue_limits directly.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

Showing 3 changed files with 22 additions and 2 deletions Side-by-side Diff

block/blk-settings.c
Diff comments   View file @ 3c5820c
... ... @@ -428,6 +428,25 @@
428 428 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 +/**
431 450 * blk_queue_io_opt - set optimal request size for the queue
432 451 * @q: the request queue for the device
433 452 * @opt: optimal request size in bytes
... ... @@ -442,7 +461,7 @@
442 461 */
443 462 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 }
447 466 EXPORT_SYMBOL(blk_queue_io_opt);
448 467  
drivers/md/dm-stripe.c
Diff comments   View file @ 3c5820c
... ... @@ -336,7 +336,7 @@
336 336 unsigned chunk_size = (sc->chunk_mask + 1) << 9;
337 337  
338 338 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  
342 342 static struct target_type stripe_target = {
include/linux/blkdev.h
Diff comments   View file @ 3c5820c
... ... @@ -935,6 +935,7 @@
935 935 unsigned int alignment);
936 936 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
937 937 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);
938 939 extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
939 940 extern void blk_set_default_limits(struct queue_limits *lim);
940 941 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,