diff options
Diffstat (limited to 'block/blk-sysfs.c')
| -rw-r--r-- | block/blk-sysfs.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index a580688c3ad5..003aa684e854 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -127,6 +127,46 @@ unlock: return ret; } +static ssize_t queue_async_depth_show(struct gendisk *disk, char *page) +{ + guard(mutex)(&disk->queue->elevator_lock); + + return queue_var_show(disk->queue->async_depth, page); +} + +static ssize_t +queue_async_depth_store(struct gendisk *disk, const char *page, size_t count) +{ + struct request_queue *q = disk->queue; + unsigned int memflags; + unsigned long nr; + int ret; + + if (!queue_is_mq(q)) + return -EINVAL; + + ret = queue_var_store(&nr, page, count); + if (ret < 0) + return ret; + + if (nr == 0) + return -EINVAL; + + memflags = blk_mq_freeze_queue(q); + scoped_guard(mutex, &q->elevator_lock) { + if (q->elevator) { + q->async_depth = min(q->nr_requests, nr); + if (q->elevator->type->ops.depth_updated) + q->elevator->type->ops.depth_updated(q); + } else { + ret = -EINVAL; + } + } + blk_mq_unfreeze_queue(q, memflags); + + return ret; +} + static ssize_t queue_ra_show(struct gendisk *disk, char *page) { ssize_t ret; @@ -532,6 +572,7 @@ static struct queue_sysfs_entry _prefix##_entry = { \ } QUEUE_RW_ENTRY(queue_requests, "nr_requests"); +QUEUE_RW_ENTRY(queue_async_depth, "async_depth"); QUEUE_RW_ENTRY(queue_ra, "read_ahead_kb"); QUEUE_LIM_RW_ENTRY(queue_max_sectors, "max_sectors_kb"); QUEUE_LIM_RO_ENTRY(queue_max_hw_sectors, "max_hw_sectors_kb"); @@ -719,6 +760,7 @@ static struct attribute *blk_mq_queue_attrs[] = { */ &elv_iosched_entry.attr, &queue_requests_entry.attr, + &queue_async_depth_entry.attr, #ifdef CONFIG_BLK_WBT &queue_wb_lat_entry.attr, #endif |