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blk-zoned: implement ioctls

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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>
This commit is contained in:
Shaun Tancheff
2016-10-18 15:40:35 +09:00
committed by Jens Axboe
parent 6a0cb1bc10
commit 3ed05a987e
5 changed files with 162 additions and 0 deletions
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40
include/uapi/linux/blkzoned.h
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@@ -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 */

4
include/uapi/linux/fs.h
View File

@@ -225,6 +225,10 @@ struct fsxattr {
#define BLKSECDISCARD _IO(0x12,125)
#define BLKROTATIONAL _IO(0x12,126)
#define BLKZEROOUT _IO(0x12,127)
/*
* A jump here: 130-131 are reserved for zoned block devices
* (see uapi/linux/blkzoned.h)
*/
#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
#define FIBMAP _IO(0x00,1) /* bmap access */