From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
This patch removes the legacy device active I/O shutdown code that was
originally called from transport_processing_thread() context during shutdown
including transport_processing_shutdown() and transport_release_all_cmds().
This is due to the fact that in modern configfs control plane code by the
time shutdown of an se_device instance in transport_processing_thread()
is allowed to occur via:
rmdir /sys/kernel/config/target/core/$HBA/$DEV
all active I/O will already have been ceased while removing active configfs
fabric Port/LUN symlinks. Eg: the removal of an active se_device is protected
by inter-module VFS references from active Port/LUN symlinks.
Two WARN_ON() checks have been added in their place before exiting
transport_processing_thread() to watch out for any leaked descriptors.
Cc: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
---
drivers/target/target_core_transport.c | 220 +-------------------------------
1 files changed, 2 insertions(+), 218 deletions(-)
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 36fb39c..ee73f10 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -1040,41 +1040,6 @@ void transport_dump_dev_state(
*bl += sprintf(b + *bl, " ");
}
-/* transport_release_all_cmds():
- *
- *
- */
-static void transport_release_all_cmds(struct se_device *dev)
-{
- struct se_cmd *cmd, *tcmd;
- int bug_out = 0, t_state;
- unsigned long flags;
-
- spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
- list_for_each_entry_safe(cmd, tcmd, &dev->dev_queue_obj.qobj_list,
- se_queue_node) {
- t_state = cmd->t_state;
- list_del_init(&cmd->se_queue_node);
- spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock,
- flags);
-
- pr_err("Releasing ITT: 0x%08x, i_state: %u,"
- " t_state: %u directly\n",
- cmd->se_tfo->get_task_tag(cmd),
- cmd->se_tfo->get_cmd_state(cmd), t_state);
-
- transport_put_cmd(cmd);
- bug_out = 1;
-
- spin_lock_irqsave(&dev->dev_queue_obj.cmd_queue_lock, flags);
- }
- spin_unlock_irqrestore(&dev->dev_queue_obj.cmd_queue_lock, flags);
-#if 0
- if (bug_out)
- BUG();
-#endif
-}
-
void transport_dump_vpd_proto_id(
struct t10_vpd *vpd,
unsigned char *p_buf,
@@ -4859,180 +4824,6 @@ int transport_generic_do_tmr(struct se_cmd *cmd)
return 0;
}
-/*
- * Called with spin_lock_irq(&dev->execute_task_lock); held
- *
- */
-static struct se_task *
-transport_get_task_from_state_list(struct se_device *dev)
-{
- struct se_task *task;
-
- if (list_empty(&dev->state_task_list))
- return NULL;
-
- list_for_each_entry(task, &dev->state_task_list, t_state_list)
- break;
-
- list_del(&task->t_state_list);
- atomic_set(&task->task_state_active, 0);
-
- return task;
-}
-
-static void transport_processing_shutdown(struct se_device *dev)
-{
- struct se_cmd *cmd;
- struct se_task *task;
- unsigned long flags;
- /*
- * Empty the struct se_device's struct se_task state list.
- */
- spin_lock_irqsave(&dev->execute_task_lock, flags);
- while ((task = transport_get_task_from_state_list(dev))) {
- if (!task->task_se_cmd) {
- pr_err("task->task_se_cmd is NULL!\n");
- continue;
- }
- cmd = task->task_se_cmd;
-
- spin_unlock_irqrestore(&dev->execute_task_lock, flags);
-
- spin_lock_irqsave(&cmd->t_state_lock, flags);
-
- pr_debug("PT: cmd: %p task: %p ITT: 0x%08x,"
- " i_state: %d, t_state/def_t_state:"
- " %d/%d cdb: 0x%02x\n", cmd, task,
- cmd->se_tfo->get_task_tag(cmd),
- cmd->se_tfo->get_cmd_state(cmd),
- cmd->t_state, cmd->deferred_t_state,
- cmd->t_task_cdb[0]);
- pr_debug("PT: ITT[0x%08x] - t_tasks: %d t_task_cdbs_left:"
- " %d t_task_cdbs_sent: %d -- t_transport_active: %d"
- " t_transport_stop: %d t_transport_sent: %d\n",
- cmd->se_tfo->get_task_tag(cmd),
- cmd->t_task_list_num,
- atomic_read(&cmd->t_task_cdbs_left),
- atomic_read(&cmd->t_task_cdbs_sent),
- atomic_read(&cmd->t_transport_active),
- atomic_read(&cmd->t_transport_stop),
- atomic_read(&cmd->t_transport_sent));
-
- if (atomic_read(&task->task_active)) {
- atomic_set(&task->task_stop, 1);
- spin_unlock_irqrestore(
- &cmd->t_state_lock, flags);
-
- pr_debug("Waiting for task: %p to shutdown for dev:"
- " %p\n", task, dev);
- wait_for_completion(&task->task_stop_comp);
- pr_debug("Completed task: %p shutdown for dev: %p\n",
- task, dev);
-
- spin_lock_irqsave(&cmd->t_state_lock, flags);
- atomic_dec(&cmd->t_task_cdbs_left);
-
- atomic_set(&task->task_active, 0);
- atomic_set(&task->task_stop, 0);
- } else {
- if (atomic_read(&task->task_execute_queue) != 0)
- transport_remove_task_from_execute_queue(task, dev);
- }
- __transport_stop_task_timer(task, &flags);
-
- if (!atomic_dec_and_test(&cmd->t_task_cdbs_ex_left)) {
- spin_unlock_irqrestore(
- &cmd->t_state_lock, flags);
-
- pr_debug("Skipping task: %p, dev: %p for"
- " t_task_cdbs_ex_left: %d\n", task, dev,
- atomic_read(&cmd->t_task_cdbs_ex_left));
-
- spin_lock_irqsave(&dev->execute_task_lock, flags);
- continue;
- }
-
- if (atomic_read(&cmd->t_transport_active)) {
- pr_debug("got t_transport_active = 1 for task: %p, dev:"
- " %p\n", task, dev);
-
- if (atomic_read(&cmd->t_fe_count)) {
- spin_unlock_irqrestore(
- &cmd->t_state_lock, flags);
- transport_send_check_condition_and_sense(
- cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE,
- 0);
- transport_remove_cmd_from_queue(cmd,
- &cmd->se_dev->dev_queue_obj);
-
- transport_lun_remove_cmd(cmd);
- transport_cmd_check_stop(cmd, 1, 0);
- } else {
- spin_unlock_irqrestore(
- &cmd->t_state_lock, flags);
-
- transport_remove_cmd_from_queue(cmd,
- &cmd->se_dev->dev_queue_obj);
-
- transport_lun_remove_cmd(cmd);
-
- if (transport_cmd_check_stop(cmd, 1, 0))
- transport_put_cmd(cmd);
- }
-
- spin_lock_irqsave(&dev->execute_task_lock, flags);
- continue;
- }
- pr_debug("Got t_transport_active = 0 for task: %p, dev: %p\n",
- task, dev);
-
- if (atomic_read(&cmd->t_fe_count)) {
- spin_unlock_irqrestore(
- &cmd->t_state_lock, flags);
- transport_send_check_condition_and_sense(cmd,
- TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
- transport_remove_cmd_from_queue(cmd,
- &cmd->se_dev->dev_queue_obj);
-
- transport_lun_remove_cmd(cmd);
- transport_cmd_check_stop(cmd, 1, 0);
- } else {
- spin_unlock_irqrestore(
- &cmd->t_state_lock, flags);
-
- transport_remove_cmd_from_queue(cmd,
- &cmd->se_dev->dev_queue_obj);
- transport_lun_remove_cmd(cmd);
-
- if (transport_cmd_check_stop(cmd, 1, 0))
- transport_put_cmd(cmd);
- }
-
- spin_lock_irqsave(&dev->execute_task_lock, flags);
- }
- spin_unlock_irqrestore(&dev->execute_task_lock, flags);
- /*
- * Empty the struct se_device's struct se_cmd list.
- */
- while ((cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj))) {
-
- pr_debug("From Device Queue: cmd: %p t_state: %d\n",
- cmd, cmd->t_state);
-
- if (atomic_read(&cmd->t_fe_count)) {
- transport_send_check_condition_and_sense(cmd,
- TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
-
- transport_lun_remove_cmd(cmd);
- transport_cmd_check_stop(cmd, 1, 0);
- } else {
- transport_lun_remove_cmd(cmd);
- if (transport_cmd_check_stop(cmd, 1, 0))
- transport_put_cmd(cmd);
- }
- }
-}
-
/* transport_processing_thread():
*
*
@@ -5052,14 +4843,6 @@ static int transport_processing_thread(void *param)
if (ret < 0)
goto out;
- spin_lock_irq(&dev->dev_status_lock);
- if (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) {
- spin_unlock_irq(&dev->dev_status_lock);
- transport_processing_shutdown(dev);
- continue;
- }
- spin_unlock_irq(&dev->dev_status_lock);
-
get_cmd:
__transport_execute_tasks(dev);
@@ -5135,7 +4918,8 @@ get_cmd:
}
out:
- transport_release_all_cmds(dev);
+ WARN_ON(!list_empty(&dev->state_task_list));
+ WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
dev->process_thread = NULL;
return 0;
}
--
1.5.6.5
--
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
