[PATCH 4/9] scsi/util: add helper functions for persistent reservation types conversion

[Changqi Lu]

This commit introduces two helper functions
that facilitate the conversion between the
persistent reservation types used in the SCSI
protocol and those used in the block layer.

Signed-off-by: Changqi Lu <luchangqi.123@bytedance.com>
Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
---
 include/scsi/utils.h |  5 +++++
 scsi/utils.c         | 40 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+)

diff --git a/include/scsi/utils.h b/include/scsi/utils.h
index d5c8efa16e..8212860231 100644
--- a/include/scsi/utils.h
+++ b/include/scsi/utils.h
@@ -1,6 +1,8 @@
 #ifndef SCSI_UTILS_H
 #define SCSI_UTILS_H
 
+#include "block/block-common.h"
+#include "scsi/constants.h"
 #ifdef CONFIG_LINUX
 #include <scsi/sg.h>
 #endif
@@ -135,6 +137,9 @@ uint32_t scsi_data_cdb_xfer(uint8_t *buf);
 uint32_t scsi_cdb_xfer(uint8_t *buf);
 int scsi_cdb_length(uint8_t *buf);
 
+BlockPrType scsi_pr_type_to_block(SCSIPrType type);
+SCSIPrType block_pr_type_to_scsi(BlockPrType type);
+
 /* Linux SG_IO interface.  */
 #ifdef CONFIG_LINUX
 #define SG_ERR_DRIVER_TIMEOUT  0x06
diff --git a/scsi/utils.c b/scsi/utils.c
index 357b036671..381803c81c 100644
--- a/scsi/utils.c
+++ b/scsi/utils.c
@@ -658,3 +658,43 @@ int scsi_sense_from_host_status(uint8_t host_status,
     }
     return GOOD;
 }
+
+BlockPrType scsi_pr_type_to_block(SCSIPrType type)
+{
+    switch (type) {
+    case SCSI_PR_WRITE_EXCLUSIVE:
+        return BLK_PR_WRITE_EXCLUSIVE;
+    case SCSI_PR_EXCLUSIVE_ACCESS:
+        return BLK_PR_EXCLUSIVE_ACCESS;
+    case SCSI_PR_WRITE_EXCLUSIVE_REGS_ONLY:
+        return BLK_PR_WRITE_EXCLUSIVE_REGS_ONLY;
+    case SCSI_PR_EXCLUSIVE_ACCESS_REGS_ONLY:
+        return BLK_PR_EXCLUSIVE_ACCESS_REGS_ONLY;
+    case SCSI_PR_WRITE_EXCLUSIVE_ALL_REGS:
+        return BLK_PR_WRITE_EXCLUSIVE_ALL_REGS;
+    case SCSI_PR_EXCLUSIVE_ACCESS_ALL_REGS:
+        return BLK_PR_EXCLUSIVE_ACCESS_ALL_REGS;
+    }
+
+    return 0;
+}
+
+SCSIPrType block_pr_type_to_scsi(BlockPrType type)
+{
+    switch (type) {
+    case BLK_PR_WRITE_EXCLUSIVE:
+        return SCSI_PR_WRITE_EXCLUSIVE;
+    case BLK_PR_EXCLUSIVE_ACCESS:
+        return SCSI_PR_EXCLUSIVE_ACCESS;
+    case BLK_PR_WRITE_EXCLUSIVE_REGS_ONLY:
+        return SCSI_PR_WRITE_EXCLUSIVE_REGS_ONLY;
+    case BLK_PR_EXCLUSIVE_ACCESS_REGS_ONLY:
+        return SCSI_PR_EXCLUSIVE_ACCESS_REGS_ONLY;
+    case BLK_PR_WRITE_EXCLUSIVE_ALL_REGS:
+        return SCSI_PR_WRITE_EXCLUSIVE_ALL_REGS;
+    case BLK_PR_EXCLUSIVE_ACCESS_ALL_REGS:
+        return SCSI_PR_EXCLUSIVE_ACCESS_ALL_REGS;
+    }
+
+    return 0;
+}
-- 
2.20.1