scst: Remove the exec_sync flag

Since all device handlers have at least one asynchronous mode, remove
the exec_sync flag.


git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@7919 d57e44dd-8a1f-0410-8b47-8ef2f437770f

doc/scst_pg.sgml

@@ -563,8 +563,6 @@ struct scst_dev_type
 
 	unsigned no_proc:1;
 
-	unsigned exec_sync:1;
-
 	unsigned pr_cmds_notifications:1;
 
 	int threads_num;
@@ -607,9 +605,6 @@ execution in the atomic (non-sleeping) context.
 <item> <bf/no_proc/ - true, if no /proc files should be automatically
 created by SCST for this dev handler
 
-<item> <bf/exec_sync/ - should be true, if exec() is synchronous. This
-is a hint to SCST core to optimize commands order management.
-
 <item> <bf/pr_cmds_notifications/ - should be set if the device wants to
 receive notification of Persistent Reservation commands (PR OUT only)
 Note: The notifications will not be sent if the command failed.
@@ -682,9 +677,8 @@ Returns:
 	mid-level.
 </itemize>
 
-If this function provides sync execution, you should set
-exec_sync flag and consider to setup dedicated threads by
-setting <it/threads_num/ > 0.
+If this function provides sync execution, you should consider to setup
+dedicated threads by setting <it/threads_num/ > 0.
 
 Optional, if not set, the commands will be sent directly to SCSI
 device.

scst/include/scst.h

@@ -1381,12 +1381,6 @@ struct scst_dev_type {
 	unsigned no_proc:1;
 #endif
 
-	/*
-	 * Should be true, if exec() is synchronous. This is a hint to SCST core
-	 * to optimize commands order management.
-	 */
-	unsigned exec_sync:1;
-
 	/*
 	 * Should be set if the device wants to receive notification of
 	 * Persistent Reservation commands (PR OUT only)
@@ -1454,9 +1448,8 @@ struct scst_dev_type {
 	 *  - SCST_EXEC_NOT_COMPLETED - the cmd should be sent to SCSI
 	 *	mid-level.
 	 *
-	 * If this function provides sync execution, you should set
-	 * exec_sync flag and consider to setup dedicated threads by
-	 * setting threads_num > 0.
+	 * If this function provides sync execution, you should to set up
+	 * dedicated threads by setting threads_num > 0.
 	 *
 	 * Dev handlers implementing internal queuing in their exec() callback
 	 * should call scst_check_local_events() just before the actual

scst/src/dev_handlers/scst_vdisk.c

@@ -760,7 +760,6 @@ static vdisk_op_fn nullio_ops[256];
 static struct scst_dev_type vdisk_file_devtype = {
 	.name =			"vdisk_fileio",
 	.type =			TYPE_DISK,
-	.exec_sync =		1,
 	.threads_num =		-1,
 	.parse_atomic =		1,
 	.dev_done_atomic =	1,
@@ -922,7 +921,6 @@ static struct scst_dev_type vdisk_null_devtype = {
 static struct scst_dev_type vcdrom_devtype = {
 	.name =			"vcdrom",
 	.type =			TYPE_ROM,
-	.exec_sync =		1,
 	.threads_num =		-1,
 	.parse_atomic =		1,
 	.dev_done_atomic =	1,

scst/src/scst_targ.c

@@ -953,7 +953,7 @@ int scst_pre_parse(struct scst_cmd *cmd)
 #ifdef CONFIG_SCST_STRICT_SERIALIZING
 	cmd->inc_expected_sn_on_done = 1;
 #else
-	cmd->inc_expected_sn_on_done = devt->exec_sync || cmd->cmd_naca ||
+	cmd->inc_expected_sn_on_done = cmd->cmd_naca ||
 		(!dev->has_own_order_mgmt &&
 		 (dev->queue_alg == SCST_QUEUE_ALG_0_RESTRICTED_REORDER ||
 		  cmd->queue_type == SCST_CMD_QUEUE_ORDERED));