Release 4.15 include/linux/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/blkdev.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)

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
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Martin K. Petersen
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Christoph Hellwig
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Dmitriy Monakhov
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Directory: include/linux

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