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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677/* 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>#include <linux/wordpart.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,};
static inline u64 full_pi_ref_tag(const struct request *rq){ unsigned int shift = ilog2(queue_logical_block_size(rq->q));
if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY) && rq->q->limits.integrity.interval_exp) shift = rq->q->limits.integrity.interval_exp; return blk_rq_pos(rq) >> (shift - SECTOR_SHIFT);}
/* * 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){ return lower_32_bits(full_pi_ref_tag(rq));}
struct crc64_pi_tuple { __be64 guard_tag; __be16 app_tag; __u8 ref_tag[6];};
/** * lower_48_bits() - return bits 0-47 of a number * @n: the number we're accessing */static inline u64 lower_48_bits(u64 n){ return n & ((1ull << 48) - 1);}
static inline u64 ext_pi_ref_tag(struct request *rq){ return lower_48_bits(full_pi_ref_tag(rq));}
#endif