target: replace the processing thread with a TMR work queue

The last functionality of the target processing thread is offloading possibly
long running task management requests from the submitter context.  To keep
TMR semantics the same we need a single threaded ordered queue, which can
be provided by a per-device workqueue with the right flags.

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

1 files changed, 1 insertions, 12 deletions

diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index 11052b24ee41..4f4f04219b11 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -147,7 +147,6 @@ enum transport_state_table {
         TRANSPORT_WRITE_PENDING = 3,
         TRANSPORT_PROCESSING    = 5,
         TRANSPORT_COMPLETE      = 6,
-        TRANSPORT_PROCESS_TMR   = 9,
         TRANSPORT_ISTATE_PROCESSING = 11,
         TRANSPORT_COMPLETE_QF_WP = 18,
         TRANSPORT_COMPLETE_QF_OK = 19,
@@ -464,13 +463,6 @@ struct t10_reservation {
         struct t10_reservation_ops pr_ops;
 };
 
-struct se_queue_obj {
-        atomic_t                queue_cnt;
-        spinlock_t              cmd_queue_lock;
-        struct list_head        qobj_list;
-        wait_queue_head_t       thread_wq;
-};
-
 struct se_tmr_req {
         /* Task Management function to be performed */
         u8                      function;
@@ -527,7 +519,6 @@ struct se_cmd {
         /* Only used for internal passthrough and legacy TCM fabric modules */
         struct se_session       *se_sess;
         struct se_tmr_req       *se_tmr_req;
-        struct list_head        se_queue_node;
         struct list_head        se_cmd_list;
         struct completion       cmd_wait_comp;
         struct kref             cmd_kref;
@@ -774,7 +765,6 @@ struct se_device {
         struct se_obj           dev_obj;
         struct se_obj           dev_access_obj;
         struct se_obj           dev_export_obj;
-        struct se_queue_obj     dev_queue_obj;
         spinlock_t              delayed_cmd_lock;
         spinlock_t              execute_task_lock;
         spinlock_t              dev_reservation_lock;
@@ -790,8 +780,7 @@ struct se_device {
         struct t10_pr_registration *dev_pr_res_holder;
         struct list_head        dev_sep_list;
         struct list_head        dev_tmr_list;
-        /* Pointer to descriptor for processing thread */
-        struct task_struct      *process_thread;
+        struct workqueue_struct *tmr_wq;
         struct work_struct      qf_work_queue;
         struct list_head        delayed_cmd_list;
         struct list_head        state_list;