1 files changed, 64 insertions, 2 deletions

diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h
index 4c3ab8377fd3..467377884b63 100644
--- a/drivers/scsi/sd.h
+++ b/drivers/scsi/sd.h
@@ -167,6 +167,68 @@ enum sd_dif_target_protection_types {
 };
 
 /*
+ * Look up the DIX operation based on whether the command is read or
+ * write and whether dix and dif are enabled.
+ */
+static inline unsigned int sd_prot_op(bool write, bool dix, bool dif)
+{
+        /* Lookup table: bit 2 (write), bit 1 (dix), bit 0 (dif) */
+        const unsigned int ops[] = {    /* wrt dix dif */
+                SCSI_PROT_NORMAL,       /*  0   0   0  */
+                SCSI_PROT_READ_STRIP,   /*  0   0   1  */
+                SCSI_PROT_READ_INSERT,  /*  0   1   0  */
+                SCSI_PROT_READ_PASS,    /*  0   1   1  */
+                SCSI_PROT_NORMAL,       /*  1   0   0  */
+                SCSI_PROT_WRITE_INSERT, /*  1   0   1  */
+                SCSI_PROT_WRITE_STRIP,  /*  1   1   0  */
+                SCSI_PROT_WRITE_PASS,   /*  1   1   1  */
+        };
+
+        return ops[write << 2 | dix << 1 | dif];
+}
+
+/*
+ * Returns a mask of the protection flags that are valid for a given DIX
+ * operation.
+ */
+static inline unsigned int sd_prot_flag_mask(unsigned int prot_op)
+{
+        const unsigned int flag_mask[] = {
+                [SCSI_PROT_NORMAL]              = 0,
+
+                [SCSI_PROT_READ_STRIP]          = SCSI_PROT_TRANSFER_PI |
+                                                  SCSI_PROT_GUARD_CHECK |
+                                                  SCSI_PROT_REF_CHECK |
+                                                  SCSI_PROT_REF_INCREMENT,
+
+                [SCSI_PROT_READ_INSERT]         = SCSI_PROT_REF_INCREMENT |
+                                                  SCSI_PROT_IP_CHECKSUM,
+
+                [SCSI_PROT_READ_PASS]           = SCSI_PROT_TRANSFER_PI |
+                                                  SCSI_PROT_GUARD_CHECK |
+                                                  SCSI_PROT_REF_CHECK |
+                                                  SCSI_PROT_REF_INCREMENT |
+                                                  SCSI_PROT_IP_CHECKSUM,
+
+                [SCSI_PROT_WRITE_INSERT]        = SCSI_PROT_TRANSFER_PI |
+                                                  SCSI_PROT_REF_INCREMENT,
+
+                [SCSI_PROT_WRITE_STRIP]         = SCSI_PROT_GUARD_CHECK |
+                                                  SCSI_PROT_REF_CHECK |
+                                                  SCSI_PROT_REF_INCREMENT |
+                                                  SCSI_PROT_IP_CHECKSUM,
+
+                [SCSI_PROT_WRITE_PASS]          = SCSI_PROT_TRANSFER_PI |
+                                                  SCSI_PROT_GUARD_CHECK |
+                                                  SCSI_PROT_REF_CHECK |
+                                                  SCSI_PROT_REF_INCREMENT |
+                                                  SCSI_PROT_IP_CHECKSUM,
+        };
+
+        return flag_mask[prot_op];
+}
+
+/*
  * Data Integrity Field tuple.
  */
 struct sd_dif_tuple {
@@ -178,7 +240,7 @@ struct sd_dif_tuple {
 #ifdef CONFIG_BLK_DEV_INTEGRITY
 
 extern void sd_dif_config_host(struct scsi_disk *);
-extern void sd_dif_prepare(struct request *rq, sector_t, unsigned int);
+extern void sd_dif_prepare(struct scsi_cmnd *scmd);
 extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
 
 #else /* CONFIG_BLK_DEV_INTEGRITY */
@@ -186,7 +248,7 @@ extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
 static inline void sd_dif_config_host(struct scsi_disk *disk)
 {
 }
-static inline int sd_dif_prepare(struct request *rq, sector_t s, unsigned int a)
+static inline int sd_dif_prepare(struct scsi_cmnd *scmd)
 {
         return 0;
 }