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-rw-r--r--block/blk-sysfs.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 306759bbdf1..58b53c354c2 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -250,6 +250,27 @@ queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count)
return ret;
}
+static ssize_t queue_random_show(struct request_queue *q, char *page)
+{
+ return queue_var_show(blk_queue_add_random(q), page);
+}
+
+static ssize_t queue_random_store(struct request_queue *q, const char *page,
+ size_t count)
+{
+ unsigned long val;
+ ssize_t ret = queue_var_store(&val, page, count);
+
+ spin_lock_irq(q->queue_lock);
+ if (val)
+ queue_flag_set(QUEUE_FLAG_ADD_RANDOM, q);
+ else
+ queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
+ spin_unlock_irq(q->queue_lock);
+
+ return ret;
+}
+
static ssize_t queue_iostats_show(struct request_queue *q, char *page)
{
return queue_var_show(blk_queue_io_stat(q), page);
@@ -374,6 +395,12 @@ static struct queue_sysfs_entry queue_iostats_entry = {
.store = queue_iostats_store,
};
+static struct queue_sysfs_entry queue_random_entry = {
+ .attr = {.name = "add_random", .mode = S_IRUGO | S_IWUSR },
+ .show = queue_random_show,
+ .store = queue_random_store,
+};
+
static struct attribute *default_attrs[] = {
&queue_requests_entry.attr,
&queue_ra_entry.attr,
@@ -394,6 +421,7 @@ static struct attribute *default_attrs[] = {
&queue_nomerges_entry.attr,
&queue_rq_affinity_entry.attr,
&queue_iostats_entry.attr,
+ &queue_random_entry.attr,
NULL,
};