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| author | Martin K. Petersen <martin.petersen@oracle.com> | 2014-09-26 19:20:07 -0400 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-09-27 09:14:59 -0600 |
| commit | 2341c2f8c33196d02cf5a721746eea4e3c06674a (patch) | |
| tree | cd51e37c084f016ea05a253b7b9041866d2e12fb /include/linux | |
| parent | 4eaf99beadcefbf126fa05e66fb40fca999e09fd (diff) | |
| download | lwn-2341c2f8c33196d02cf5a721746eea4e3c06674a.tar.gz lwn-2341c2f8c33196d02cf5a721746eea4e3c06674a.zip | |
block: Add T10 Protection Information functions
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>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/crc-t10dif.h | 5 | ||||
| -rw-r--r-- | include/linux/t10-pi.h | 22 |
2 files changed, 25 insertions, 2 deletions
diff --git a/include/linux/crc-t10dif.h b/include/linux/crc-t10dif.h index b3cb71f0d3b0..cf53d0773ce3 100644 --- a/include/linux/crc-t10dif.h +++ b/include/linux/crc-t10dif.h @@ -6,7 +6,8 @@ #define CRC_T10DIF_DIGEST_SIZE 2 #define CRC_T10DIF_BLOCK_SIZE 1 -__u16 crc_t10dif_generic(__u16 crc, const unsigned char *buffer, size_t len); -__u16 crc_t10dif(unsigned char const *, size_t); +extern __u16 crc_t10dif_generic(__u16 crc, const unsigned char *buffer, + size_t len); +extern __u16 crc_t10dif(unsigned char const *, size_t); #endif diff --git a/include/linux/t10-pi.h b/include/linux/t10-pi.h new file mode 100644 index 000000000000..6a8b9942632d --- /dev/null +++ b/include/linux/t10-pi.h @@ -0,0 +1,22 @@ +#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 |