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-rw-r--r--block/blk-mq-debugfs.c24
-rw-r--r--include/linux/blkdev.h3
2 files changed, 27 insertions, 0 deletions
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index 9edebbdce0bd..9ebc2945f991 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -135,6 +135,29 @@ static void print_stat(struct seq_file *m, struct blk_rq_stat *stat)
}
}
+static int queue_write_hint_show(void *data, struct seq_file *m)
+{
+ struct request_queue *q = data;
+ int i;
+
+ for (i = 0; i < BLK_MAX_WRITE_HINTS; i++)
+ seq_printf(m, "hint%d: %llu\n", i, q->write_hints[i]);
+
+ return 0;
+}
+
+static ssize_t queue_write_hint_store(void *data, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct request_queue *q = data;
+ int i;
+
+ for (i = 0; i < BLK_MAX_WRITE_HINTS; i++)
+ q->write_hints[i] = 0;
+
+ return count;
+}
+
static int queue_poll_stat_show(void *data, struct seq_file *m)
{
struct request_queue *q = data;
@@ -730,6 +753,7 @@ static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = {
{"poll_stat", 0400, queue_poll_stat_show},
{"requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops},
{"state", 0600, queue_state_show, queue_state_write},
+ {"write_hints", 0600, queue_write_hint_show, queue_write_hint_store},
{},
};
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 0eebd3bcfd85..e1e289ab66b9 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -596,6 +596,9 @@ struct request_queue {
void *rq_alloc_data;
struct work_struct release_work;
+
+#define BLK_MAX_WRITE_HINTS 5
+ u64 write_hints[BLK_MAX_WRITE_HINTS];
};
#define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */