145 lines
5.0 KiB
C
145 lines
5.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
|
|
/*
|
|
* Zoned block devices handling.
|
|
*
|
|
* Copyright (C) 2015 Seagate Technology PLC
|
|
*
|
|
* Written by: Shaun Tancheff <shaun.tancheff@seagate.com>
|
|
*
|
|
* Modified by: Damien Le Moal <damien.lemoal@hgst.com>
|
|
* Copyright (C) 2016 Western Digital
|
|
*
|
|
* This file is licensed under the terms of the GNU General Public
|
|
* License version 2. This program is licensed "as is" without any
|
|
* warranty of any kind, whether express or implied.
|
|
*/
|
|
#ifndef _UAPI_BLKZONED_H
|
|
#define _UAPI_BLKZONED_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/ioctl.h>
|
|
|
|
/**
|
|
* enum blk_zone_type - Types of zones allowed in a zoned device.
|
|
*
|
|
* @BLK_ZONE_TYPE_CONVENTIONAL: The zone has no write pointer and can be writen
|
|
* randomly. Zone reset has no effect on the zone.
|
|
* @BLK_ZONE_TYPE_SEQWRITE_REQ: The zone must be written sequentially
|
|
* @BLK_ZONE_TYPE_SEQWRITE_PREF: The zone can be written non-sequentially
|
|
*
|
|
* Any other value not defined is reserved and must be considered as invalid.
|
|
*/
|
|
enum blk_zone_type {
|
|
BLK_ZONE_TYPE_CONVENTIONAL = 0x1,
|
|
BLK_ZONE_TYPE_SEQWRITE_REQ = 0x2,
|
|
BLK_ZONE_TYPE_SEQWRITE_PREF = 0x3,
|
|
};
|
|
|
|
/**
|
|
* enum blk_zone_cond - Condition [state] of a zone in a zoned device.
|
|
*
|
|
* @BLK_ZONE_COND_NOT_WP: The zone has no write pointer, it is conventional.
|
|
* @BLK_ZONE_COND_EMPTY: The zone is empty.
|
|
* @BLK_ZONE_COND_IMP_OPEN: The zone is open, but not explicitly opened.
|
|
* @BLK_ZONE_COND_EXP_OPEN: The zones was explicitly opened by an
|
|
* OPEN ZONE command.
|
|
* @BLK_ZONE_COND_CLOSED: The zone was [explicitly] closed after writing.
|
|
* @BLK_ZONE_COND_FULL: The zone is marked as full, possibly by a zone
|
|
* FINISH ZONE command.
|
|
* @BLK_ZONE_COND_READONLY: The zone is read-only.
|
|
* @BLK_ZONE_COND_OFFLINE: The zone is offline (sectors cannot be read/written).
|
|
*
|
|
* The Zone Condition state machine in the ZBC/ZAC standards maps the above
|
|
* deinitions as:
|
|
* - ZC1: Empty | BLK_ZONE_EMPTY
|
|
* - ZC2: Implicit Open | BLK_ZONE_COND_IMP_OPEN
|
|
* - ZC3: Explicit Open | BLK_ZONE_COND_EXP_OPEN
|
|
* - ZC4: Closed | BLK_ZONE_CLOSED
|
|
* - ZC5: Full | BLK_ZONE_FULL
|
|
* - ZC6: Read Only | BLK_ZONE_READONLY
|
|
* - ZC7: Offline | BLK_ZONE_OFFLINE
|
|
*
|
|
* Conditions 0x5 to 0xC are reserved by the current ZBC/ZAC spec and should
|
|
* be considered invalid.
|
|
*/
|
|
enum blk_zone_cond {
|
|
BLK_ZONE_COND_NOT_WP = 0x0,
|
|
BLK_ZONE_COND_EMPTY = 0x1,
|
|
BLK_ZONE_COND_IMP_OPEN = 0x2,
|
|
BLK_ZONE_COND_EXP_OPEN = 0x3,
|
|
BLK_ZONE_COND_CLOSED = 0x4,
|
|
BLK_ZONE_COND_READONLY = 0xD,
|
|
BLK_ZONE_COND_FULL = 0xE,
|
|
BLK_ZONE_COND_OFFLINE = 0xF,
|
|
};
|
|
|
|
/**
|
|
* struct blk_zone - Zone descriptor for BLKREPORTZONE ioctl.
|
|
*
|
|
* @start: Zone start in 512 B sector units
|
|
* @len: Zone length in 512 B sector units
|
|
* @wp: Zone write pointer location in 512 B sector units
|
|
* @type: see enum blk_zone_type for possible values
|
|
* @cond: see enum blk_zone_cond for possible values
|
|
* @non_seq: Flag indicating that the zone is using non-sequential resources
|
|
* (for host-aware zoned block devices only).
|
|
* @reset: Flag indicating that a zone reset is recommended.
|
|
* @reserved: Padding to 64 B to match the ZBC/ZAC defined zone descriptor size.
|
|
*
|
|
* start, len and wp use the regular 512 B sector unit, regardless of the
|
|
* device logical block size. The overall structure size is 64 B to match the
|
|
* ZBC/ZAC defined zone descriptor and allow support for future additional
|
|
* zone information.
|
|
*/
|
|
struct blk_zone {
|
|
__u64 start; /* Zone start sector */
|
|
__u64 len; /* Zone length in number of sectors */
|
|
__u64 wp; /* Zone write pointer position */
|
|
__u8 type; /* Zone type */
|
|
__u8 cond; /* Zone condition */
|
|
__u8 non_seq; /* Non-sequential write resources active */
|
|
__u8 reset; /* Reset write pointer recommended */
|
|
__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 */
|