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Diffstat (limited to 'block/blk-sysfs.c')
-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)
250 return ret; 250 return ret;
251} 251}
252 252
253static ssize_t queue_random_show(struct request_queue *q, char *page)
254{
255 return queue_var_show(blk_queue_add_random(q), page);
256}
257
258static ssize_t queue_random_store(struct request_queue *q, const char *page,
259 size_t count)
260{
261 unsigned long val;
262 ssize_t ret = queue_var_store(&val, page, count);
263
264 spin_lock_irq(q->queue_lock);
265 if (val)
266 queue_flag_set(QUEUE_FLAG_ADD_RANDOM, q);
267 else
268 queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
269 spin_unlock_irq(q->queue_lock);
270
271 return ret;
272}
273
253static ssize_t queue_iostats_show(struct request_queue *q, char *page) 274static ssize_t queue_iostats_show(struct request_queue *q, char *page)
254{ 275{
255 return queue_var_show(blk_queue_io_stat(q), page); 276 return queue_var_show(blk_queue_io_stat(q), page);
@@ -374,6 +395,12 @@ static struct queue_sysfs_entry queue_iostats_entry = {
374 .store = queue_iostats_store, 395 .store = queue_iostats_store,
375}; 396};
376 397
398static struct queue_sysfs_entry queue_random_entry = {
399 .attr = {.name = "add_random", .mode = S_IRUGO | S_IWUSR },
400 .show = queue_random_show,
401 .store = queue_random_store,
402};
403
377static struct attribute *default_attrs[] = { 404static struct attribute *default_attrs[] = {
378 &queue_requests_entry.attr, 405 &queue_requests_entry.attr,
379 &queue_ra_entry.attr, 406 &queue_ra_entry.attr,
@@ -394,6 +421,7 @@ static struct attribute *default_attrs[] = {
394 &queue_nomerges_entry.attr, 421 &queue_nomerges_entry.attr,
395 &queue_rq_affinity_entry.attr, 422 &queue_rq_affinity_entry.attr,
396 &queue_iostats_entry.attr, 423 &queue_iostats_entry.attr,
424 &queue_random_entry.attr,
397 NULL, 425 NULL,
398}; 426};
399 427