perf tools: Pass build_id object to dso__build_id_equal()

[linux-2.6-microblaze.git] / block / blk-settings.c

diff --git a/block/blk-settings.c b/block/blk-settings.c
index 76a7e03..34b721a 100644 (file)
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -801,6 +801,52 @@ bool blk_queue_can_use_dma_map_merging(struct request_queue *q,
 }
 EXPORT_SYMBOL_GPL(blk_queue_can_use_dma_map_merging);
 
+/**
+ * blk_queue_set_zoned - configure a disk queue zoned model.
+ * @disk:      the gendisk of the queue to configure
+ * @model:     the zoned model to set
+ *
+ * Set the zoned model of the request queue of @disk according to @model.
+ * When @model is BLK_ZONED_HM (host managed), this should be called only
+ * if zoned block device support is enabled (CONFIG_BLK_DEV_ZONED option).
+ * If @model specifies BLK_ZONED_HA (host aware), the effective model used
+ * depends on CONFIG_BLK_DEV_ZONED settings and on the existence of partitions
+ * on the disk.
+ */
+void blk_queue_set_zoned(struct gendisk *disk, enum blk_zoned_model model)
+{
+       switch (model) {
+       case BLK_ZONED_HM:
+               /*
+                * Host managed devices are supported only if
+                * CONFIG_BLK_DEV_ZONED is enabled.
+                */
+               WARN_ON_ONCE(!IS_ENABLED(CONFIG_BLK_DEV_ZONED));
+               break;
+       case BLK_ZONED_HA:
+               /*
+                * Host aware devices can be treated either as regular block
+                * devices (similar to drive managed devices) or as zoned block
+                * devices to take advantage of the zone command set, similarly
+                * to host managed devices. We try the latter if there are no
+                * partitions and zoned block device support is enabled, else
+                * we do nothing special as far as the block layer is concerned.
+                */
+               if (!IS_ENABLED(CONFIG_BLK_DEV_ZONED) ||
+                   disk_has_partitions(disk))
+                       model = BLK_ZONED_NONE;
+               break;
+       case BLK_ZONED_NONE:
+       default:
+               if (WARN_ON_ONCE(model != BLK_ZONED_NONE))
+                       model = BLK_ZONED_NONE;
+               break;
+       }
+
+       disk->queue->limits.zoned = model;
+}
+EXPORT_SYMBOL_GPL(blk_queue_set_zoned);
+
 static int __init blk_settings_init(void)
 {
        blk_max_low_pfn = max_low_pfn - 1;