target: split transport_cmd_check_stop

Inline the transport_off == 0 case into target_execute_cmd to simplify
the function for the remaining cases.

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

diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 803ac5202fcd17e8d5e0b97d54a1b868c5920593..3f20fbd88cd42e98c6ddbfdf973fce95fbb7d803 100644 (file)
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -467,18 +467,7 @@ static void target_remove_from_state_list(struct se_cmd *cmd)
        spin_unlock_irqrestore(&dev->execute_task_lock, flags);
 }
 
-/*     transport_cmd_check_stop():
- *
- *     'transport_off = 1' determines if CMD_T_ACTIVE should be cleared.
- *     'transport_off = 2' determines if task_dev_state should be removed.
- *
- *     A non-zero u8 t_state sets cmd->t_state.
- *     Returns 1 when command is stopped, else 0.
- */
-static int transport_cmd_check_stop(
-       struct se_cmd *cmd,
-       int transport_off,
-       u8 t_state)
+static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists)
 {
        unsigned long flags;
 
@@ -492,13 +481,23 @@ static int transport_cmd_check_stop(
                        __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
 
                cmd->transport_state &= ~CMD_T_ACTIVE;
-               if (transport_off == 2)
+               if (remove_from_lists)
                        target_remove_from_state_list(cmd);
                spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 
                complete(&cmd->transport_lun_stop_comp);
                return 1;
        }
+
+       if (remove_from_lists) {
+               target_remove_from_state_list(cmd);
+
+               /*
+                * Clear struct se_cmd->se_lun before the handoff to FE.
+                */
+               cmd->se_lun = NULL;
+       }
+
        /*
         * Determine if frontend context caller is requesting the stopping of
         * this command for frontend exceptions.
@@ -508,58 +507,36 @@ static int transport_cmd_check_stop(
                        __func__, __LINE__,
                        cmd->se_tfo->get_task_tag(cmd));
 
-               if (transport_off == 2)
-                       target_remove_from_state_list(cmd);
-
-               /*
-                * Clear struct se_cmd->se_lun before the transport_off == 2 handoff
-                * to FE.
-                */
-               if (transport_off == 2)
-                       cmd->se_lun = NULL;
                spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 
                complete(&cmd->t_transport_stop_comp);
                return 1;
        }
-       if (transport_off) {
-               cmd->transport_state &= ~CMD_T_ACTIVE;
-               if (transport_off == 2) {
-                       target_remove_from_state_list(cmd);
-                       /*
-                        * Clear struct se_cmd->se_lun before the transport_off == 2
-                        * handoff to fabric module.
-                        */
-                       cmd->se_lun = NULL;
-                       /*
-                        * Some fabric modules like tcm_loop can release
-                        * their internally allocated I/O reference now and
-                        * struct se_cmd now.
-                        *
-                        * Fabric modules are expected to return '1' here if the
-                        * se_cmd being passed is released at this point,
-                        * or zero if not being released.
-                        */
-                       if (cmd->se_tfo->check_stop_free != NULL) {
-                               spin_unlock_irqrestore(
-                                       &cmd->t_state_lock, flags);
-
-                               return cmd->se_tfo->check_stop_free(cmd);
-                       }
+
+       cmd->transport_state &= ~CMD_T_ACTIVE;
+       if (remove_from_lists) {
+               /*
+                * Some fabric modules like tcm_loop can release
+                * their internally allocated I/O reference now and
+                * struct se_cmd now.
+                *
+                * Fabric modules are expected to return '1' here if the
+                * se_cmd being passed is released at this point,
+                * or zero if not being released.
+                */
+               if (cmd->se_tfo->check_stop_free != NULL) {
+                       spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+                       return cmd->se_tfo->check_stop_free(cmd);
                }
-               spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+       }
 
-               return 0;
-       } else if (t_state)
-               cmd->t_state = t_state;
        spin_unlock_irqrestore(&cmd->t_state_lock, flags);
-
        return 0;
 }
 
 static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
 {
-       return transport_cmd_check_stop(cmd, 2, 0);
+       return transport_cmd_check_stop(cmd, true);
 }
 
 static void transport_lun_remove_cmd(struct se_cmd *cmd)
@@ -1887,8 +1864,36 @@ static void target_execute_cmd(struct se_cmd *cmd)
 {
        struct se_device *dev = cmd->se_dev;
 
-       if (transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING))
+       /*
+        * Determine if IOCTL context caller in requesting the stopping of this
+        * command for LUN shutdown purposes.
+        */
+       spin_lock_irq(&cmd->t_state_lock);
+       if (cmd->transport_state & CMD_T_LUN_STOP) {
+               pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
+                       __func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
+
+               cmd->transport_state &= ~CMD_T_ACTIVE;
+               spin_unlock_irq(&cmd->t_state_lock);
+               complete(&cmd->transport_lun_stop_comp);
+               return;
+       }
+       /*
+        * Determine if frontend context caller is requesting the stopping of
+        * this command for frontend exceptions.
+        */
+       if (cmd->transport_state & CMD_T_STOP) {
+               pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
+                       __func__, __LINE__,
+                       cmd->se_tfo->get_task_tag(cmd));
+
+               spin_unlock_irq(&cmd->t_state_lock);
+               complete(&cmd->t_transport_stop_comp);
                return;
+       }
+
+       cmd->t_state = TRANSPORT_PROCESSING;
+       spin_unlock_irq(&cmd->t_state_lock);
 
        if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
                goto execute;
@@ -2530,10 +2535,10 @@ static int transport_generic_write_pending(struct se_cmd *cmd)
         * Clear the se_cmd for WRITE_PENDING status in order to set
         * CMD_T_ACTIVE so that transport_generic_handle_data can be called
         * from HW target mode interrupt code.  This is safe to be called
-        * with transport_off=1 before the cmd->se_tfo->write_pending
+        * with remove_from_lists false before the cmd->se_tfo->write_pending
         * because the se_cmd->se_lun pointer is not being cleared.
         */
-       transport_cmd_check_stop(cmd, 1, 0);
+       transport_cmd_check_stop(cmd, false);
 
        /*
         * Call the fabric write_pending function here to let the
@@ -2723,7 +2728,7 @@ static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
                pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
                         cmd->se_tfo->get_task_tag(cmd));
                spin_unlock_irqrestore(&cmd->t_state_lock, flags);
-               transport_cmd_check_stop(cmd, 1, 0);
+               transport_cmd_check_stop(cmd, false);
                return -EPERM;
        }
        cmd->transport_state |= CMD_T_LUN_FE_STOP;
@@ -2768,11 +2773,6 @@ static void __transport_clear_lun_from_sessions(struct se_lun *lun)
                       struct se_cmd, se_lun_node);
                list_del_init(&cmd->se_lun_node);
 
-               /*
-                * This will notify iscsi_target_transport.c:
-                * transport_cmd_check_stop() that a LUN shutdown is in
-                * progress for the iscsi_cmd_t.
-                */
                spin_lock(&cmd->t_state_lock);
                pr_debug("SE_LUN[%d] - Setting cmd->transport"
                        "_lun_stop for  ITT: 0x%08x\n",
@@ -2839,7 +2839,7 @@ check_cond:
 
                        spin_unlock_irqrestore(&cmd->t_state_lock,
                                        cmd_flags);
-                       transport_cmd_check_stop(cmd, 1, 0);
+                       transport_cmd_check_stop(cmd, false);
                        complete(&cmd->transport_lun_fe_stop_comp);
                        spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
                        continue;