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>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 include/scsi/utils.h |  8 +++++
 scsi/utils.c         | 81 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 89 insertions(+)

diff --git a/include/scsi/utils.h b/include/scsi/utils.h
index d5c8efa16e..89a0b082fb 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 +137,12 @@ 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);
+
+uint8_t scsi_pr_cap_to_block(uint16_t scsi_pr_cap);
+uint16_t block_pr_cap_to_scsi(uint8_t block_pr_cap);
+
 /* 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..0dfdeb499d 100644
--- a/scsi/utils.c
+++ b/scsi/utils.c
@@ -658,3 +658,84 @@ 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;
+}
+
+
+uint8_t scsi_pr_cap_to_block(uint16_t scsi_pr_cap)
+{
+    uint8_t res = 0;
+
+    res |= (scsi_pr_cap & SCSI_PR_CAP_WR_EX) ?
+           BLK_PR_CAP_WR_EX : 0;
+    res |= (scsi_pr_cap & SCSI_PR_CAP_EX_AC) ?
+           BLK_PR_CAP_EX_AC : 0;
+    res |= (scsi_pr_cap & SCSI_PR_CAP_WR_EX_RO) ?
+           BLK_PR_CAP_WR_EX_RO : 0;
+    res |= (scsi_pr_cap & SCSI_PR_CAP_EX_AC_RO) ?
+           BLK_PR_CAP_EX_AC_RO : 0;
+    res |= (scsi_pr_cap & SCSI_PR_CAP_WR_EX_AR) ?
+           BLK_PR_CAP_WR_EX_AR : 0;
+    res |= (scsi_pr_cap & SCSI_PR_CAP_EX_AC_AR) ?
+           BLK_PR_CAP_EX_AC_AR : 0;
+
+    return res;
+}
+
+uint16_t block_pr_cap_to_scsi(uint8_t block_pr_cap)
+{
+    uint16_t res = 0;
+
+    res |= (block_pr_cap & BLK_PR_CAP_WR_EX) ?
+              SCSI_PR_CAP_WR_EX : 0;
+    res |= (block_pr_cap & BLK_PR_CAP_EX_AC) ?
+              SCSI_PR_CAP_EX_AC : 0;
+    res |= (block_pr_cap & BLK_PR_CAP_WR_EX_RO) ?
+              SCSI_PR_CAP_WR_EX_RO : 0;
+    res |= (block_pr_cap & BLK_PR_CAP_EX_AC_RO) ?
+              SCSI_PR_CAP_EX_AC_RO : 0;
+    res |= (block_pr_cap & BLK_PR_CAP_WR_EX_AR) ?
+              SCSI_PR_CAP_WR_EX_AR : 0;
+    res |= (block_pr_cap & BLK_PR_CAP_EX_AC_AR) ?
+              SCSI_PR_CAP_EX_AC_AR : 0;
+
+    return res;
+}
-- 
2.20.1