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authorMartin K. Petersen <martin.petersen@oracle.com>2008-07-17 17:08:48 -0400
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-07-26 15:14:55 -0400
commit7027ad72a689797475973c6feb5f0b673382f779 (patch)
tree4f6daa1d509708fb340d09608d79557a9af57f00 /include/scsi/scsi_cmnd.h
parentdb007fc5e20c00b356e9ffe2d0e007398c65c837 (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.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index 402c1078d01c..f9f6e793575c 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -90,6 +90,8 @@ struct scsi_cmnd {
90 90
91 /* These elements define the operation we ultimately want to perform */ 91 /* These elements define the operation we ultimately want to perform */
92 struct scsi_data_buffer sdb; 92 struct scsi_data_buffer sdb;
93 struct scsi_data_buffer *prot_sdb;
94
93 unsigned underflow; /* Return error if less than 95 unsigned underflow; /* Return error if less than
94 this amount is transferred */ 96 this amount is transferred */
95 97
@@ -274,4 +276,22 @@ static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd)
274 return scmd->request->sector; 276 return scmd->request->sector;
275} 277}
276 278
279static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd)
280{
281 return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0;
282}
283
284static inline struct scatterlist *scsi_prot_sglist(struct scsi_cmnd *cmd)
285{
286 return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL;
287}
288
289static inline struct scsi_data_buffer *scsi_prot(struct scsi_cmnd *cmd)
290{
291 return cmd->prot_sdb;
292}
293
294#define scsi_for_each_prot_sg(cmd, sg, nseg, __i) \
295 for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i)
296
277#endif /* _SCSI_SCSI_CMND_H */ 297#endif /* _SCSI_SCSI_CMND_H */