blk-zoned: implement ioctls

Adds the new BLKREPORTZONE and BLKRESETZONE ioctls for respectively
obtaining the zone configuration of a zoned block device and resetting
the write pointer of sequential zones of a zoned block device.

The BLKREPORTZONE ioctl maps directly to a single call of the function
blkdev_report_zones. The zone information result is passed as an array
of struct blk_zone identical to the structure used internally for
processing the REQ_OP_ZONE_REPORT operation.  The BLKRESETZONE ioctl
maps to a single call of the blkdev_reset_zones function.

Signed-off-by: Shaun Tancheff <shaun.tancheff@seagate.com>
Signed-off-by: Damien Le Moal <damien.lemoal@hgst.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/include/uapi/linux/blkzoned.h b/include/uapi/linux/blkzoned.h
index a3817214b0e0..40d1d7bff537 100644
--- a/include/uapi/linux/blkzoned.h
+++ b/include/uapi/linux/blkzoned.h
@@ -16,6 +16,7 @@
 #define _UAPI_BLKZONED_H
 
 #include <linux/types.h>
+#include <linux/ioctl.h>
 
 /**
  * enum blk_zone_type - Types of zones allowed in a zoned device.
@@ -100,4 +101,43 @@ struct blk_zone {
 	__u8	reserved[36];
 };
 
+/**
+ * struct blk_zone_report - BLKREPORTZONE ioctl request/reply
+ *
+ * @sector: starting sector of report
+ * @nr_zones: IN maximum / OUT actual
+ * @reserved: padding to 16 byte alignment
+ * @zones: Space to hold @nr_zones @zones entries on reply.
+ *
+ * The array of at most @nr_zones must follow this structure in memory.
+ */
+struct blk_zone_report {
+	__u64		sector;
+	__u32		nr_zones;
+	__u8		reserved[4];
+	struct blk_zone zones[0];
+} __packed;
+
+/**
+ * struct blk_zone_range - BLKRESETZONE ioctl request
+ * @sector: starting sector of the first zone to issue reset write pointer
+ * @nr_sectors: Total number of sectors of 1 or more zones to reset
+ */
+struct blk_zone_range {
+	__u64		sector;
+	__u64		nr_sectors;
+};
+
+/**
+ * Zoned block device ioctl's:
+ *
+ * @BLKREPORTZONE: Get zone information. Takes a zone report as argument.
+ *                 The zone report will start from the zone containing the
+ *                 sector specified in the report request structure.
+ * @BLKRESETZONE: Reset the write pointer of the zones in the specified
+ *                sector range. The sector range must be zone aligned.
+ */
+#define BLKREPORTZONE	_IOWR(0x12, 130, struct blk_zone_report)
+#define BLKRESETZONE	_IOW(0x12, 131, struct blk_zone_range)
+
 #endif /* _UAPI_BLKZONED_H */