It is nontrivial to derive the role of the two attribute groups in source
file block/blk-sysfs.c. Hence add a comment that explains their roles. See
also commit 6d85ebf95c44 ("blk-sysfs: add a new attr_group for blk_mq").
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Yu Kuai <yukuai3@xxxxxxxxxx>
Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx>
---
block/blk-sysfs.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 63e481262336..0b2d04766324 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -615,6 +615,7 @@ static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page,
QUEUE_RW_ENTRY(queue_wb_lat, "wbt_lat_usec");
#endif
+/* Common attributes for bio-based and request-based queues. */
static struct attribute *queue_attrs[] = {
&queue_ra_entry.attr,
&queue_max_hw_sectors_entry.attr,
@@ -659,6 +660,7 @@ static struct attribute *queue_attrs[] = {
NULL,
};
+/* Request-based queue attributes that are not relevant for bio-based queues. */
static struct attribute *blk_mq_queue_attrs[] = {
&queue_requests_entry.attr,
&elv_iosched_entry.attr,
