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scst: add module parameter to control the copy manager auto assignment

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Reported-By: Guru Prasad <gp22online@gmail.com>
Suggested-By: Sebastian Herbszt <herbszt@gmx.de>



git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@7174 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Vladislav Bolkhovitin
2017-05-13 03:30:07 +00:00
parent 69feb6696e
commit 383ceb0a8e
5 changed files with 26 additions and 1 deletions
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10
scst/README
View File

@@ -398,6 +398,16 @@ Module scst supports the following parameters:
to be consumed by all SCSI commands of a device at any given time. By
default, it is approximately 2/5 of scst_max_cmd_mem.
- auto_cm_assignment - enables the copy managers auto registration.
If a device is not registered in the copy manager, it can not be
source or target of EXTENDED COPY commands. Enabled by default.
Disable, if you want to manually control the copy manager
registration or need to change a device, e.g. a DM cache device, with
SCST LUN on top of it to avoid extra reference the copy manager holds
on this device. In the later case you can also remove this reference
by manually deleting the corresponding copy manager LUN via sysfs interface
(/sys/kernel/scst_tgt/targets/copy_manager/copy_manager_tgt/luns/mgmt).
SCST sysfs interface
--------------------

10
scst/README_in-tree
View File

@@ -268,6 +268,16 @@ Module scst supports the following parameters:
consumed by the SCST commands for data buffers at any given time. By
default it is approximately TotalMem/4.
- auto_cm_assignment - enables the copy managers auto registration.
If a device is not registered in the copy manager, it can not be
source or target of EXTENDED COPY commands. Enabled by default.
Disable, if you want to manually control the copy manager
registration or need to change a device, e.g. a DM cache device, with
SCST LUN on top of it to avoid extra reference the copy manager holds
on this device. In the later case you can also remove this reference
by manually deleting the corresponding copy manager LUN via sysfs interface
(/sys/kernel/scst_tgt/targets/copy_manager/copy_manager_tgt/luns/mgmt).
SCST sysfs interface
--------------------

2
scst/src/scst_copy_mgr.c
View File

@@ -2709,7 +2709,7 @@ int scst_cm_on_dev_register(struct scst_device *dev)
scst_assert_activity_suspended();
lockdep_assert_held(&scst_mutex);
if (!dev->handler->auto_cm_assignment_possible)
if (!scst_auto_cm_assignment || !dev->handler->auto_cm_assignment_possible)
goto out;
res = scst_cm_dev_register(dev, SCST_MAX_LUN);

4
scst/src/scst_main.c
View File

@@ -175,6 +175,7 @@ cpumask_t default_cpu_mask;
static unsigned int scst_max_cmd_mem;
unsigned int scst_max_dev_cmd_mem;
int scst_forcibly_close_sessions;
int scst_auto_cm_assignment = true;
module_param_named(scst_threads, scst_threads, int, S_IRUGO);
MODULE_PARM_DESC(scst_threads, "SCSI target threads count");
@@ -193,6 +194,9 @@ MODULE_PARM_DESC(forcibly_close_sessions,
"If enabled, close the sessions associated with an access control group (ACG)"
" when an ACG is deleted via sysfs instead of returning -EBUSY");
module_param_named(auto_cm_assignment, scst_auto_cm_assignment, int,
S_IWUSR | S_IRUGO);
MODULE_PARM_DESC(auto_cm_assignment, "Enables the copy managers auto registration");
struct scst_dev_type scst_null_devtype = {
.name = "none",

1
scst/src/scst_priv.h
View File

@@ -151,6 +151,7 @@ extern int scst_threads;
extern unsigned int scst_max_dev_cmd_mem;
extern int scst_forcibly_close_sessions;
extern int scst_auto_cm_assignment;
extern mempool_t *scst_mgmt_mempool;
extern mempool_t *scst_mgmt_stub_mempool;