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| author | Martin K. Petersen <martin.petersen@oracle.com> | 2008-07-17 04:28:35 -0400 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2008-07-26 15:14:56 -0400 |
| commit | af55ff675a8461da6a632320710b050af4366e0c (patch) | |
| tree | 2d85ec327340f11f79cedb7d962d232c31819a8c /drivers/scsi/sd.h | |
| parent | e0597d70012c82e16ee152270a55d89d8bf66693 (diff) | |
| download | lwn-af55ff675a8461da6a632320710b050af4366e0c.tar.gz lwn-af55ff675a8461da6a632320710b050af4366e0c.zip | |
[SCSI] sd: Support for SCSI disk (SBC) Data Integrity Field
Support for controllers and disks that implement DIF protection
information:
- During command preparation the RDPROTECT/WRPROTECT must be set
correctly if the target has DIF enabled.
- READ(6) and WRITE(6) are not supported when DIF is on.
- The controller must be told how to handle the I/O via the
protection operation field in scsi_cmnd.
- Refactor the I/O completion code that extracts failed LBA from the
returned sense data and handle DIF failures correctly.
- sd_dif.c implements the functions required to prepare and complete
requests with protection information attached.
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/scsi/sd.h')
| -rw-r--r-- | drivers/scsi/sd.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h index 86b18d4170fe..550b2f70a1f8 100644 --- a/drivers/scsi/sd.h +++ b/drivers/scsi/sd.h @@ -82,4 +82,29 @@ enum sd_dif_target_protection_types { SD_DIF_TYPE3_PROTECTION = 0x3, }; +/* + * Data Integrity Field tuple. + */ +struct sd_dif_tuple { + __be16 guard_tag; /* Checksum */ + __be16 app_tag; /* Opaque storage */ + __be32 ref_tag; /* Target LBA or indirect LBA */ +}; + +#if defined(CONFIG_BLK_DEV_INTEGRITY) + +extern void sd_dif_op(struct scsi_cmnd *, unsigned int, unsigned int); +extern void sd_dif_config_host(struct scsi_disk *); +extern int sd_dif_prepare(struct request *rq, sector_t, unsigned int); +extern void sd_dif_complete(struct scsi_cmnd *, unsigned int); + +#else /* CONFIG_BLK_DEV_INTEGRITY */ + +#define sd_dif_op(a, b, c) do { } while (0) +#define sd_dif_config_host(a) do { } while (0) +#define sd_dif_prepare(a, b, c) (0) +#define sd_dif_complete(a, b) (0) + +#endif /* CONFIG_BLK_DEV_INTEGRITY */ + #endif /* _SCSI_DISK_H */ |