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e2be04c7f9
Many user space API headers have licensing information, which is either
incomplete, badly formatted or just a shorthand for referring to the
license under which the file is supposed to be. This makes it hard for
compliance tools to determine the correct license.
Update these files with an SPDX license identifier. The identifier was
chosen based on the license information in the file.
GPL/LGPL licensed headers get the matching GPL/LGPL SPDX license
identifier with the added 'WITH Linux-syscall-note' exception, which is
the officially assigned exception identifier for the kernel syscall
exception:
NOTE! This copyright does *not* cover user programs that use kernel
services by normal system calls - this is merely considered normal use
of the kernel, and does *not* fall under the heading of "derived work".
This exception makes it possible to include GPL headers into non GPL
code, without confusing license compliance tools.
Headers which have either explicit dual licensing or are just licensed
under a non GPL license are updated with the corresponding SPDX
identifier and the GPLv2 with syscall exception identifier. The format
is:
((GPL-2.0 WITH Linux-syscall-note) OR SPDX-ID-OF-OTHER-LICENSE)
SPDX license identifiers are a legally binding shorthand, which can be
used instead of the full boiler plate text. The update does not remove
existing license information as this has to be done on a case by case
basis and the copyright holders might have to be consulted. This will
happen in a separate step.
This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne. See the previous patch in this series for the
methodology of how this patch was researched.
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
145 lines
5.0 KiB
C
145 lines
5.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* Zoned block devices handling.
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*
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* Copyright (C) 2015 Seagate Technology PLC
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*
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* Written by: Shaun Tancheff <shaun.tancheff@seagate.com>
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*
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* Modified by: Damien Le Moal <damien.lemoal@hgst.com>
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* Copyright (C) 2016 Western Digital
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#ifndef _UAPI_BLKZONED_H
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#define _UAPI_BLKZONED_H
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#include <linux/types.h>
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#include <linux/ioctl.h>
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/**
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* enum blk_zone_type - Types of zones allowed in a zoned device.
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*
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* @BLK_ZONE_TYPE_CONVENTIONAL: The zone has no write pointer and can be writen
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* randomly. Zone reset has no effect on the zone.
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* @BLK_ZONE_TYPE_SEQWRITE_REQ: The zone must be written sequentially
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* @BLK_ZONE_TYPE_SEQWRITE_PREF: The zone can be written non-sequentially
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*
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* Any other value not defined is reserved and must be considered as invalid.
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*/
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enum blk_zone_type {
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BLK_ZONE_TYPE_CONVENTIONAL = 0x1,
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BLK_ZONE_TYPE_SEQWRITE_REQ = 0x2,
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BLK_ZONE_TYPE_SEQWRITE_PREF = 0x3,
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};
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/**
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* enum blk_zone_cond - Condition [state] of a zone in a zoned device.
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*
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* @BLK_ZONE_COND_NOT_WP: The zone has no write pointer, it is conventional.
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* @BLK_ZONE_COND_EMPTY: The zone is empty.
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* @BLK_ZONE_COND_IMP_OPEN: The zone is open, but not explicitly opened.
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* @BLK_ZONE_COND_EXP_OPEN: The zones was explicitly opened by an
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* OPEN ZONE command.
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* @BLK_ZONE_COND_CLOSED: The zone was [explicitly] closed after writing.
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* @BLK_ZONE_COND_FULL: The zone is marked as full, possibly by a zone
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* FINISH ZONE command.
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* @BLK_ZONE_COND_READONLY: The zone is read-only.
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* @BLK_ZONE_COND_OFFLINE: The zone is offline (sectors cannot be read/written).
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*
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* The Zone Condition state machine in the ZBC/ZAC standards maps the above
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* deinitions as:
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* - ZC1: Empty | BLK_ZONE_EMPTY
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* - ZC2: Implicit Open | BLK_ZONE_COND_IMP_OPEN
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* - ZC3: Explicit Open | BLK_ZONE_COND_EXP_OPEN
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* - ZC4: Closed | BLK_ZONE_CLOSED
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* - ZC5: Full | BLK_ZONE_FULL
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* - ZC6: Read Only | BLK_ZONE_READONLY
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* - ZC7: Offline | BLK_ZONE_OFFLINE
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*
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* Conditions 0x5 to 0xC are reserved by the current ZBC/ZAC spec and should
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* be considered invalid.
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*/
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enum blk_zone_cond {
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BLK_ZONE_COND_NOT_WP = 0x0,
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BLK_ZONE_COND_EMPTY = 0x1,
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BLK_ZONE_COND_IMP_OPEN = 0x2,
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BLK_ZONE_COND_EXP_OPEN = 0x3,
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BLK_ZONE_COND_CLOSED = 0x4,
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BLK_ZONE_COND_READONLY = 0xD,
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BLK_ZONE_COND_FULL = 0xE,
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BLK_ZONE_COND_OFFLINE = 0xF,
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};
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/**
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* struct blk_zone - Zone descriptor for BLKREPORTZONE ioctl.
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*
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* @start: Zone start in 512 B sector units
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* @len: Zone length in 512 B sector units
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* @wp: Zone write pointer location in 512 B sector units
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* @type: see enum blk_zone_type for possible values
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* @cond: see enum blk_zone_cond for possible values
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* @non_seq: Flag indicating that the zone is using non-sequential resources
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* (for host-aware zoned block devices only).
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* @reset: Flag indicating that a zone reset is recommended.
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* @reserved: Padding to 64 B to match the ZBC/ZAC defined zone descriptor size.
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*
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* start, len and wp use the regular 512 B sector unit, regardless of the
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* device logical block size. The overall structure size is 64 B to match the
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* ZBC/ZAC defined zone descriptor and allow support for future additional
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* zone information.
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*/
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struct blk_zone {
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__u64 start; /* Zone start sector */
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__u64 len; /* Zone length in number of sectors */
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__u64 wp; /* Zone write pointer position */
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__u8 type; /* Zone type */
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__u8 cond; /* Zone condition */
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__u8 non_seq; /* Non-sequential write resources active */
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__u8 reset; /* Reset write pointer recommended */
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__u8 reserved[36];
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};
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/**
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* struct blk_zone_report - BLKREPORTZONE ioctl request/reply
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*
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* @sector: starting sector of report
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* @nr_zones: IN maximum / OUT actual
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* @reserved: padding to 16 byte alignment
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* @zones: Space to hold @nr_zones @zones entries on reply.
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*
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* The array of at most @nr_zones must follow this structure in memory.
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*/
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struct blk_zone_report {
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__u64 sector;
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__u32 nr_zones;
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__u8 reserved[4];
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struct blk_zone zones[0];
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} __packed;
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/**
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* struct blk_zone_range - BLKRESETZONE ioctl request
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* @sector: starting sector of the first zone to issue reset write pointer
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* @nr_sectors: Total number of sectors of 1 or more zones to reset
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*/
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struct blk_zone_range {
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__u64 sector;
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__u64 nr_sectors;
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};
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/**
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* Zoned block device ioctl's:
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*
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* @BLKREPORTZONE: Get zone information. Takes a zone report as argument.
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* The zone report will start from the zone containing the
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* sector specified in the report request structure.
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* @BLKRESETZONE: Reset the write pointer of the zones in the specified
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* sector range. The sector range must be zone aligned.
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*/
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#define BLKREPORTZONE _IOWR(0x12, 130, struct blk_zone_report)
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#define BLKRESETZONE _IOW(0x12, 131, struct blk_zone_range)
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#endif /* _UAPI_BLKZONED_H */
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