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94dfc73e7c
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 */
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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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* enum blk_zone_report_flags - Feature flags of reported zone descriptors.
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*
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* @BLK_ZONE_REP_CAPACITY: Zone descriptor has capacity field.
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*/
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enum blk_zone_report_flags {
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BLK_ZONE_REP_CAPACITY = (1 << 0),
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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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* @resv: Padding for 8B alignment.
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* @capacity: Zone usable capacity in 512 B sector units
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* @reserved: Padding to 64 B to match the ZBC, ZAC and ZNS defined zone
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* descriptor size.
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*
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* start, len, capacity and wp use the regular 512 B sector unit, regardless
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* of the device logical block size. The overall structure size is 64 B to
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* match the ZBC, ZAC and ZNS defined zone descriptor and allow support for
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* future additional 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 resv[4];
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__u64 capacity; /* Zone capacity in number of sectors */
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__u8 reserved[24];
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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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* @flags: one or more flags as defined by enum blk_zone_report_flags.
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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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__u32 flags;
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struct blk_zone zones[];
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};
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/**
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* struct blk_zone_range - BLKRESETZONE/BLKOPENZONE/
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* BLKCLOSEZONE/BLKFINISHZONE ioctl
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* requests
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* @sector: Starting sector of the first zone to operate on.
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* @nr_sectors: Total number of sectors of all zones to operate on.
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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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* @BLKGETZONESZ: Get the device zone size in number of 512 B sectors.
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* @BLKGETNRZONES: Get the total number of zones of the device.
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* @BLKOPENZONE: Open the zones in the specified sector range.
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* The 512 B sector range must be zone aligned.
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* @BLKCLOSEZONE: Close the zones in the specified sector range.
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* The 512 B sector range must be zone aligned.
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* @BLKFINISHZONE: Mark the zones as full in the specified sector range.
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* The 512 B 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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#define BLKGETZONESZ _IOR(0x12, 132, __u32)
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#define BLKGETNRZONES _IOR(0x12, 133, __u32)
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#define BLKOPENZONE _IOW(0x12, 134, struct blk_zone_range)
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#define BLKCLOSEZONE _IOW(0x12, 135, struct blk_zone_range)
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#define BLKFINISHZONE _IOW(0x12, 136, struct blk_zone_range)
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#endif /* _UAPI_BLKZONED_H */
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