diff options
| author | Martin K. Petersen <martin.petersen@oracle.com> | 2008-07-17 17:08:48 -0400 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2008-07-26 15:14:55 -0400 |
| commit | 7027ad72a689797475973c6feb5f0b673382f779 (patch) | |
| tree | 4f6daa1d509708fb340d09608d79557a9af57f00 /include/scsi/scsi_cmnd.h | |
| parent | db007fc5e20c00b356e9ffe2d0e007398c65c837 (diff) | |
[SCSI] Support devices with protection information
Implement support for DMA of protection information for devices that
are data integrity capable.
- Add support for mapping an extra scatter-gather list containing
the protection information.
- Allocate protection scsi_data_buffer if host is DIX (integrity DMA)
capable.
- Accessor function for checking whether a device has protection
enabled.
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'include/scsi/scsi_cmnd.h')
| -rw-r--r-- | include/scsi/scsi_cmnd.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h index 402c1078d01..f9f6e793575 100644 --- a/include/scsi/scsi_cmnd.h +++ b/include/scsi/scsi_cmnd.h @@ -90,6 +90,8 @@ struct scsi_cmnd { /* These elements define the operation we ultimately want to perform */ struct scsi_data_buffer sdb; + struct scsi_data_buffer *prot_sdb; + unsigned underflow; /* Return error if less than this amount is transferred */ @@ -274,4 +276,22 @@ static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd) return scmd->request->sector; } +static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd) +{ + return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0; +} + +static inline struct scatterlist *scsi_prot_sglist(struct scsi_cmnd *cmd) +{ + return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL; +} + +static inline struct scsi_data_buffer *scsi_prot(struct scsi_cmnd *cmd) +{ + return cmd->prot_sdb; +} + +#define scsi_for_each_prot_sg(cmd, sg, nseg, __i) \ + for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i) + #endif /* _SCSI_SCSI_CMND_H */ |