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block: Add T10 Protection Information functions

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The T10 Protection Information format is also used by some devices that
do not go through the SCSI layer (virtual block devices, NVMe). Relocate
the relevant functions to a block layer library that can be used without
involving SCSI.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Martin K. Petersen 2014-09-26 19:20:07 -04:00 • committed by Jens Axboe
parent 4eaf99bead
commit 2341c2f8c3
7 changed files with 245 additions and 226 deletions
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22
include/linux/t10-pi.h Normal file
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#ifndef _LINUX_T10_PI_H
#define _LINUX_T10_PI_H
#include <linux/types.h>
#include <linux/blkdev.h>
/*
* 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 */
};
extern struct blk_integrity t10_pi_type1_crc;
extern struct blk_integrity t10_pi_type1_ip;
extern struct blk_integrity t10_pi_type3_crc;
extern struct blk_integrity t10_pi_type3_ip;
#endif