block: Implement support for zoned block devices

[mirror_ubuntu-bionic-kernel.git] / include / linux / blkdev.h

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index f19e16bb43d1cd3ac5891427e8a03248fb8f2c12..252043f7cd2c8ea169b853533ae3cdfff8475ecc 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -24,6 +24,7 @@
 #include <linux/rcupdate.h>
 #include <linux/percpu-refcount.h>
 #include <linux/scatterlist.h>
+#include <linux/blkzoned.h>
 
 struct module;
 struct scsi_ioctl_command;
@@ -302,6 +303,21 @@ struct queue_limits {
        enum blk_zoned_model    zoned;
 };
 
+#ifdef CONFIG_BLK_DEV_ZONED
+
+struct blk_zone_report_hdr {
+       unsigned int    nr_zones;
+       u8              padding[60];
+};
+
+extern int blkdev_report_zones(struct block_device *bdev,
+                              sector_t sector, struct blk_zone *zones,
+                              unsigned int *nr_zones, gfp_t gfp_mask);
+extern int blkdev_reset_zones(struct block_device *bdev, sector_t sectors,
+                             sector_t nr_sectors, gfp_t gfp_mask);
+
+#endif /* CONFIG_BLK_DEV_ZONED */
+
 struct request_queue {
        /*
         * Together with queue_head for cacheline sharing
@@ -654,6 +670,11 @@ static inline bool blk_queue_is_zoned(struct request_queue *q)
        }
 }
 
+static inline unsigned int blk_queue_zone_size(struct request_queue *q)
+{
+       return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0;
+}
+
 /*
  * We regard a request as sync, if either a read or a sync write
  */
@@ -1401,6 +1422,16 @@ static inline bool bdev_is_zoned(struct block_device *bdev)
        return false;
 }
 
+static inline unsigned int bdev_zone_size(struct block_device *bdev)
+{
+       struct request_queue *q = bdev_get_queue(bdev);
+
+       if (q)
+               return blk_queue_zone_size(q);
+
+       return 0;
+}
+
 static inline int queue_dma_alignment(struct request_queue *q)
 {
        return q ? q->dma_alignment : 511;