mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 20:02:17 +00:00
![Gustavo A. R. Silva](/assets/img/avatar_default.png)
There is a regular need in the kernel to provide a way to declare having a dynamically sized set of trailing elements in a structure. Kernel code should always use “flexible array members”[1] for these cases. The older style of one-element or zero-length arrays should no longer be used[2]. This code was transformed with the help of Coccinelle: (linux-5.19-rc2$ spatch --jobs $(getconf _NPROCESSORS_ONLN) --sp-file script.cocci --include-headers --dir . > output.patch) @@ identifier S, member, array; type T1, T2; @@ struct S { ... T1 member; T2 array[ - 0 ]; }; -fstrict-flex-arrays=3 is coming and we need to land these changes to prevent issues like these in the short future: ../fs/minix/dir.c:337:3: warning: 'strcpy' will always overflow; destination buffer has size 0, but the source string has length 2 (including NUL byte) [-Wfortify-source] strcpy(de3->name, "."); ^ Since these are all [0] to [] changes, the risk to UAPI is nearly zero. If this breaks anything, we can use a union with a new member name. [1] https://en.wikipedia.org/wiki/Flexible_array_member [2] https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays Link: https://github.com/KSPP/linux/issues/78 Build-tested-by: kernel test robot <lkp@intel.com> Link: https://lore.kernel.org/lkml/62b675ec.wKX6AOZ6cbE71vtF%25lkp@intel.com/ Acked-by: Dan Williams <dan.j.williams@intel.com> # For ndctl.h Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
173 lines
6.3 KiB
C
173 lines
6.3 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,
|
|
};
|
|
|
|
/**
|
|
* 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 */
|
|
__u8 resv[4];
|
|
__u64 capacity; /* Zone capacity in number of sectors */
|
|
__u8 reserved[24];
|
|
};
|
|
|
|
/**
|
|
* 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;
|
|
__u32 flags;
|
|
struct blk_zone zones[];
|
|
};
|
|
|
|
/**
|
|
* 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 /* _UAPI_BLKZONED_H */
|