| Current File : //usr/include/linux/blkzoned.h |
/* 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 _BLKZONED_H
#define _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,
};
/**
* enum blk_zone_report_flags - Feature flags of reported zone descriptors.
*
* @BLK_ZONE_REP_CAPACITY: Zone descriptor has capacity field.
*/
enum blk_zone_report_flags {
BLK_ZONE_REP_CAPACITY = (1 << 0),
};
/**
* 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.
* @resv: Padding for 8B alignment.
* @capacity: Zone usable capacity in 512 B sector units
* @reserved: Padding to 64 B to match the ZBC, ZAC and ZNS defined zone
* descriptor size.
*
* start, len, capacity 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 and ZNS 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 */
#ifdef __GENKSYMS__
__u8 reserved[36];
#else
__u8 resv[4];
__u64 capacity; /* Zone capacity in number of sectors */
__u8 reserved[24];
#endif
};
/**
* struct blk_zone_report - BLKREPORTZONE ioctl request/reply
*
* @sector: starting sector of report
* @nr_zones: IN maximum / OUT actual
* @flags: one or more flags as defined by enum blk_zone_report_flags.
* @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;
#ifdef __GENKSYMS__
__u8 reserved[4];
#else
__u32 flags;
#endif
struct blk_zone zones[0];
};
/**
* struct blk_zone_range - BLKRESETZONE/BLKOPENZONE/
* BLKCLOSEZONE/BLKFINISHZONE ioctl
* requests
* @sector: Starting sector of the first zone to operate on.
* @nr_sectors: Total number of sectors of all zones to operate on.
*/
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.
* @BLKGETZONESZ: Get the device zone size in number of 512 B sectors.
* @BLKGETNRZONES: Get the total number of zones of the device.
* @BLKOPENZONE: Open the zones in the specified sector range.
* The 512 B sector range must be zone aligned.
* @BLKCLOSEZONE: Close the zones in the specified sector range.
* The 512 B sector range must be zone aligned.
* @BLKFINISHZONE: Mark the zones as full in the specified sector range.
* The 512 B sector range must be zone aligned.
*/
#define BLKREPORTZONE _IOWR(0x12, 130, struct blk_zone_report)
#define BLKRESETZONE _IOW(0x12, 131, struct blk_zone_range)
#define BLKGETZONESZ _IOR(0x12, 132, __u32)
#define BLKGETNRZONES _IOR(0x12, 133, __u32)
#define BLKOPENZONE _IOW(0x12, 134, struct blk_zone_range)
#define BLKCLOSEZONE _IOW(0x12, 135, struct blk_zone_range)
#define BLKFINISHZONE _IOW(0x12, 136, struct blk_zone_range)
#endif /* _BLKZONED_H */