target: split core_scsi3_emulate_pr

Split core_scsi2_emulate_crh into one routine each for the
PERSISTENT_RESERVE_IN and PERSISTENT_RESERVE_OUT side.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

3 files changed, 45 insertions, 32 deletions

diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c
index 830953a743d6..34403e80b87c 100644
--- a/drivers/target/target_core_pr.c
+++ b/drivers/target/target_core_pr.c
@@ -3734,12 +3734,30 @@ static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
 /*
  * See spc4r17 section 6.14 Table 170
  */
-static int core_scsi3_emulate_pr_out(struct se_cmd *cmd, unsigned char *cdb)
+int target_scsi3_emulate_pr_out(struct se_cmd *cmd)
 {
+        unsigned char *cdb = &cmd->t_task_cdb[0];
         unsigned char *buf;
         u64 res_key, sa_res_key;
         int sa, scope, type, aptpl;
         int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
+
+        /*
+         * Following spc2r20 5.5.1 Reservations overview:
+         *
+         * If a logical unit has been reserved by any RESERVE command and is
+         * still reserved by any initiator, all PERSISTENT RESERVE IN and all
+         * PERSISTENT RESERVE OUT commands shall conflict regardless of
+         * initiator or service action and shall terminate with a RESERVATION
+         * CONFLICT status.
+         */
+        if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) {
+                pr_err("Received PERSISTENT_RESERVE CDB while legacy"
+                        " SPC-2 reservation is held, returning"
+                        " RESERVATION_CONFLICT\n");
+                return PYX_TRANSPORT_RESERVATION_CONFLICT;
+        }
+
         /*
          * FIXME: A NULL struct se_session pointer means an this is not coming from
          * a $FABRIC_MOD's nexus, but from internal passthrough ops.
@@ -4185,29 +4203,8 @@ static int core_scsi3_pri_read_full_status(struct se_cmd *cmd)
         return 0;
 }
 
-static int core_scsi3_emulate_pr_in(struct se_cmd *cmd, unsigned char *cdb)
-{
-        switch (cdb[1] & 0x1f) {
-        case PRI_READ_KEYS:
-                return core_scsi3_pri_read_keys(cmd);
-        case PRI_READ_RESERVATION:
-                return core_scsi3_pri_read_reservation(cmd);
-        case PRI_REPORT_CAPABILITIES:
-                return core_scsi3_pri_report_capabilities(cmd);
-        case PRI_READ_FULL_STATUS:
-                return core_scsi3_pri_read_full_status(cmd);
-        default:
-                pr_err("Unknown PERSISTENT_RESERVE_IN service"
-                        " action: 0x%02x\n", cdb[1] & 0x1f);
-                return PYX_TRANSPORT_INVALID_CDB_FIELD;
-        }
-
-}
-
-int core_scsi3_emulate_pr(struct se_cmd *cmd)
+int target_scsi3_emulate_pr_in(struct se_cmd *cmd)
 {
-        unsigned char *cdb = &cmd->t_task_cdb[0];
-        struct se_device *dev = cmd->se_dev;
         /*
          * Following spc2r20 5.5.1 Reservations overview:
          *
@@ -4217,16 +4214,27 @@ int core_scsi3_emulate_pr(struct se_cmd *cmd)
          * initiator or service action and shall terminate with a RESERVATION
          * CONFLICT status.
          */
-        if (dev->dev_flags & DF_SPC2_RESERVATIONS) {
+        if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) {
                 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
                         " SPC-2 reservation is held, returning"
                         " RESERVATION_CONFLICT\n");
                 return PYX_TRANSPORT_RESERVATION_CONFLICT;
         }
 
-        return (cdb[0] == PERSISTENT_RESERVE_OUT) ?
-               core_scsi3_emulate_pr_out(cmd, cdb) :
-               core_scsi3_emulate_pr_in(cmd, cdb);
+        switch (cmd->t_task_cdb[1] & 0x1f) {
+        case PRI_READ_KEYS:
+                return core_scsi3_pri_read_keys(cmd);
+        case PRI_READ_RESERVATION:
+                return core_scsi3_pri_read_reservation(cmd);
+        case PRI_REPORT_CAPABILITIES:
+                return core_scsi3_pri_report_capabilities(cmd);
+        case PRI_READ_FULL_STATUS:
+                return core_scsi3_pri_read_full_status(cmd);
+        default:
+                pr_err("Unknown PERSISTENT_RESERVE_IN service"
+                        " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
+                return PYX_TRANSPORT_INVALID_CDB_FIELD;
+        }
 }
 
 static int core_pt_reservation_check(struct se_cmd *cmd, u32 *pr_res_type)
diff --git a/drivers/target/target_core_pr.h b/drivers/target/target_core_pr.h
index 4e94a427e314..c9acb1108124 100644
--- a/drivers/target/target_core_pr.h
+++ b/drivers/target/target_core_pr.h
@@ -62,7 +62,9 @@ extern void core_scsi3_free_all_registrations(struct se_device *);
 extern unsigned char *core_scsi3_pr_dump_type(int);
 extern int core_scsi3_check_cdb_abort_and_preempt(struct list_head *,
                                                   struct se_cmd *);
-extern int core_scsi3_emulate_pr(struct se_cmd *);
+
+extern int target_scsi3_emulate_pr_in(struct se_cmd *cmd);
+extern int target_scsi3_emulate_pr_out(struct se_cmd *cmd);
 extern int core_setup_reservations(struct se_device *, int);
 
 #endif /* TARGET_CORE_PR_H */
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index f4232934bac5..717f84a9b42b 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -2842,11 +2842,14 @@ static int transport_generic_cmd_sequencer(
                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
                 break;
         case PERSISTENT_RESERVE_IN:
+                if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
+                        cmd->transport_emulate_cdb = target_scsi3_emulate_pr_in;
+                size = (cdb[7] << 8) + cdb[8];
+                cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
+                break;
         case PERSISTENT_RESERVE_OUT:
-                cmd->transport_emulate_cdb =
-                        (su_dev->t10_pr.res_type ==
-                         SPC3_PERSISTENT_RESERVATIONS) ?
-                        core_scsi3_emulate_pr : NULL;
+                if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
+                        cmd->transport_emulate_cdb = target_scsi3_emulate_pr_out;
                 size = (cdb[7] << 8) + cdb[8];
                 cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
                 break;