https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: f443e374ae131c168a065ea1748feac6b2e76613 authored by Linus Torvalds on 20 March 2022, 20:14:17 UTC
Linux 5.17
Linux 5.17
Tip revision: f443e37
t10-pi.h
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_T10_PI_H
#define _LINUX_T10_PI_H
#include <linux/types.h>
#include <linux/blk-mq.h>
/*
* A T10 PI-capable target device can be formatted with different
* protection schemes. Currently 0 through 3 are defined:
*
* Type 0 is regular (unprotected) I/O
*
* Type 1 defines the contents of the guard and reference tags
*
* Type 2 defines the contents of the guard and reference tags and
* uses 32-byte commands to seed the latter
*
* Type 3 defines the contents of the guard tag only
*/
enum t10_dif_type {
T10_PI_TYPE0_PROTECTION = 0x0,
T10_PI_TYPE1_PROTECTION = 0x1,
T10_PI_TYPE2_PROTECTION = 0x2,
T10_PI_TYPE3_PROTECTION = 0x3,
};
/*
* T10 Protection Information tuple.
*/
struct t10_pi_tuple {
__be16 guard_tag; /* Checksum */
__be16 app_tag; /* Opaque storage */
__be32 ref_tag; /* Target LBA or indirect LBA */
};
#define T10_PI_APP_ESCAPE cpu_to_be16(0xffff)
#define T10_PI_REF_ESCAPE cpu_to_be32(0xffffffff)
static inline u32 t10_pi_ref_tag(struct request *rq)
{
unsigned int shift = ilog2(queue_logical_block_size(rq->q));
#ifdef CONFIG_BLK_DEV_INTEGRITY
if (rq->q->integrity.interval_exp)
shift = rq->q->integrity.interval_exp;
#endif
return blk_rq_pos(rq) >> (shift - SECTOR_SHIFT) & 0xffffffff;
}
extern const struct blk_integrity_profile t10_pi_type1_crc;
extern const struct blk_integrity_profile t10_pi_type1_ip;
extern const struct blk_integrity_profile t10_pi_type3_crc;
extern const struct blk_integrity_profile t10_pi_type3_ip;
#endif