block: Expose queue nr_zones in sysfs

[sfrench/cifs-2.6.git] / block / blk-sysfs.c

diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 3772671cf2bc5ad6322786b9531e9eb8bb6c7edd..92be8092ca4f6261abd64b8144046ab63852419d 100644 (file)
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -300,6 +300,11 @@ static ssize_t queue_zoned_show(struct request_queue *q, char *page)
        }
 }
 
+static ssize_t queue_nr_zones_show(struct request_queue *q, char *page)
+{
+       return queue_var_show(blk_queue_nr_zones(q), page);
+}
+
 static ssize_t queue_nomerges_show(struct request_queue *q, char *page)
 {
        return queue_var_show((blk_queue_nomerges(q) << 1) |
@@ -637,6 +642,11 @@ static struct queue_sysfs_entry queue_zoned_entry = {
        .show = queue_zoned_show,
 };
 
+static struct queue_sysfs_entry queue_nr_zones_entry = {
+       .attr = {.name = "nr_zones", .mode = 0444 },
+       .show = queue_nr_zones_show,
+};
+
 static struct queue_sysfs_entry queue_nomerges_entry = {
        .attr = {.name = "nomerges", .mode = 0644 },
        .show = queue_nomerges_show,
@@ -727,6 +737,7 @@ static struct attribute *default_attrs[] = {
        &queue_write_zeroes_max_entry.attr,
        &queue_nonrot_entry.attr,
        &queue_zoned_entry.attr,
+       &queue_nr_zones_entry.attr,
        &queue_nomerges_entry.attr,
        &queue_rq_affinity_entry.attr,
        &queue_iostats_entry.attr,