Add constants for the persistent reservation in/out protocol
in the scsi/constant module. The constants include the persistent
reservation command, type, and scope values defined in sections
6.13 and 6.14 of the SCSI Primary Commands-4 (SPC-4) specification.

Signed-off-by: Changqi Lu <luchangqi.123@bytedance.com>
Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
---
 include/scsi/constants.h | 52 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/include/scsi/constants.h b/include/scsi/constants.h
index 9b98451912..922a314535 100644
--- a/include/scsi/constants.h
+++ b/include/scsi/constants.h
@@ -319,4 +319,56 @@
 #define IDENT_DESCR_TGT_DESCR_SIZE 32
 #define XCOPY_BLK2BLK_SEG_DESC_SIZE 28
 
+typedef enum {
+    SCSI_PR_WRITE_EXCLUSIVE                 = 0x01,
+    SCSI_PR_EXCLUSIVE_ACCESS                = 0x03,
+    SCSI_PR_WRITE_EXCLUSIVE_REGS_ONLY       = 0x05,
+    SCSI_PR_EXCLUSIVE_ACCESS_REGS_ONLY      = 0x06,
+    SCSI_PR_WRITE_EXCLUSIVE_ALL_REGS        = 0x07,
+    SCSI_PR_EXCLUSIVE_ACCESS_ALL_REGS       = 0x08,
+} SCSIPrType;
+
+typedef enum {
+    SCSI_PR_LU_SCOPE          = 0x00,
+} SCSIPrScope;
+
+typedef enum {
+    SCSI_PR_OUT_REGISTER                 = 0x0,
+    SCSI_PR_OUT_RESERVE                  = 0x1,
+    SCSI_PR_OUT_RELEASE                  = 0x2,
+    SCSI_PR_OUT_CLEAR                    = 0x3,
+    SCSI_PR_OUT_PREEMPT                  = 0x4,
+    SCSI_PR_OUT_PREEMPT_AND_ABORT        = 0x5,
+    SCSI_PR_OUT_REG_AND_IGNORE_KEY       = 0x6,
+    SCSI_PR_OUT_REG_AND_MOVE             = 0x7,
+} SCSIPrOutAction;
+
+typedef enum {
+    SCSI_PR_IN_READ_KEYS                 = 0x0,
+    SCSI_PR_IN_READ_RESERVATION          = 0x1,
+    SCSI_PR_IN_REPORT_CAPABILITIES       = 0x2,
+} SCSIPrInAction;
+
+typedef enum {
+    /* Exclusive Access All Registrants reservation type */
+    SCSI_PR_CAP_EX_AC_AR = 1 << 0,
+    /* Write Exclusive reservation type */
+    SCSI_PR_CAP_WR_EX = 1 << 9,
+    /* Exclusive Access reservation type */
+    SCSI_PR_CAP_EX_AC = 1 << 11,
+    /* Write Exclusive Registrants Only reservation type */
+    SCSI_PR_CAP_WR_EX_RO = 1 << 13,
+    /* Exclusive Access Registrants Only reservation type */
+    SCSI_PR_CAP_EX_AC_RO = 1 << 14,
+    /* Write Exclusive All Registrants reservation type */
+    SCSI_PR_CAP_WR_EX_AR = 1 << 15,
+
+    SCSI_PR_CAP_ALL = (SCSI_PR_CAP_EX_AC_AR |
+                      SCSI_PR_CAP_WR_EX |
+                      SCSI_PR_CAP_EX_AC |
+                      SCSI_PR_CAP_WR_EX_RO |
+                      SCSI_PR_CAP_EX_AC_RO |
+                      SCSI_PR_CAP_WR_EX_AR),
+} SCSIPrCap;
+
 #endif
-- 
2.20.1