[PATCH 07/12] Resource Groups Configfs Subsystem (RGCS)

Chandra Seetharaman
2006-04-28T01:34:58Z

07/12 - user_interface

Create the configfs component for managing Resource groups. Hooks up with
configfs. Provides functions for creating and deleting resource groups.
--

Signed-Off-By: Chandra Seetharaman <sekharan@us.ibm.com>
Signed-Off-By: Shailabh Nagar <nagar@watson.ibm.com>
Signed-Off-By: Matt Helsley <matthltc@us.ibm.com>

init/Kconfig | 12 +++
kernel/res_group/Makefile | 1
kernel/res_group/rgcs.c | 162 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 175 insertions(+)

Index: linux-2617-rc3/init/Kconfig
===================================================================
--- linux-2617-rc3.orig/init/Kconfig 2006-04-27 09:20:59.000000000 -0700
+++ linux-2617-rc3/init/Kconfig 2006-04-27 10:17:11.000000000 -0700
@@ -163,6 +163,18 @@ config RES_GROUPS
If you say Y here, enable the Resource Group File System and at least
one of the resource controllers below. Say N if you are unsure.

+config RGCS
+ tristate "Resource Groups Configfs Subsystem"
+ depends on RES_GROUPS
+ select CONFIGFS_FS
+ default m
+ help
+ RGCS is the User Interface for Resource Groups. Compiling it as
+ a module permits users to only load RGCS if they intend to use it.
+
+ Say M if unsure, Y to save on module loading. N doesn't make sense
+ when Resource Groups has been configured.
+
endmenu
config SYSCTL
bool "Sysctl support"
Index: linux-2617-rc3/kernel/res_group/rgcs.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2617-rc3/kernel/res_group/rgcs.c 2006-04-27 10:18:39.000000000 -0700
@@ -0,0 +1,162 @@
+/*
+ * kernel/res_group/rgcs.c
+ *
+ * Copyright (C) Shailabh Nagar, IBM Corp. 2005
+ * Chandra Seetharaman, IBM Corp. 2005, 2006
+ *
+ * Resource Group Configfs Subsystem (rgcs) provides the user interface
+ * for Resource groups.
+ *
+ * Latest version, more details at http://ckrm.sf.net
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ *
+ */
+#include <linux/module.h>
+#include <linux/configfs.h>
+#include "local.h"
+
+static struct configfs_subsystem rgcs_subsys;
+static struct config_item_type rgcs_item_type;
+
+struct rgcs_rgroup {
+ char *name;
+ struct resource_group *core;
+ struct config_group group;
+};
+
+static inline struct rgcs_rgroup *group_to_rgcs_rgroup(struct config_group *grp)
+{
+ return container_of(grp, struct rgcs_rgroup, group);
+}
+
+static inline struct rgcs_rgroup *item_to_rgcs_rgroup(struct config_item *item)
+{
+ return group_to_rgcs_rgroup(to_config_group(item));
+}
+
+static inline struct resource_group *group_to_res_group(
+ struct config_group *grp)
+{
+ struct rgcs_rgroup *rgroup;
+ /*
+ * A configfs wrinkle forces us to treat the root group as a special
+ * case instead of wrapping the group in a struct rgcs_rgroup like all
+ * other groups.
+ */
+ if (grp == &rgcs_subsys.su_group)
+ return &default_res_group;
+ rgroup = group_to_rgcs_rgroup(grp);
+ return rgroup->core;
+}
+
+static inline struct resource_group *item_to_res_group(
+ struct config_item *item)
+{
+ return group_to_res_group(to_config_group(item));
+}
+
+/*
+ * This is the function that is called when a 'mkdir' command
+ * is issued under our filesystem
+ */
+static struct config_group *make_rgcs_rgroup(struct config_group *group,
+ const char *name)
+{
+ struct rgcs_rgroup *rgroup, *rc_par;
+ struct resource_group *core, *parent;
+ char *new_name = NULL, *par_name = NULL;
+ int par_sz = 0;
+
+ rgroup = kzalloc(sizeof(struct rgcs_rgroup), GFP_KERNEL);
+ if (!rgroup)
+ return NULL;
+
+ parent = group_to_res_group(group);
+
+ if (parent != &default_res_group) {
+ rc_par = group_to_rgcs_rgroup(group);
+ par_name = rc_par->name;
+ par_sz = strlen(par_name);
+ }
+ new_name = kmalloc(par_sz + strlen(name) + 2, GFP_KERNEL);
+ if (!new_name)
+ goto noname;
+ if (par_name)
+ sprintf(new_name, "%s/%s", par_name, name);
+ else
+ sprintf(new_name, "%s", name);
+
+ core = alloc_res_group(parent, new_name);
+ if (!core)
+ goto nocore;
+ rgroup->core = core;
+ rgroup->name = new_name;
+
+ config_group_init_type_name(&rgroup->group, name, &rgcs_item_type);
+ return &rgroup->group;
+
+nocore:
+ kfree(new_name);
+noname:
+ kfree(rgroup);
+ return NULL;
+}
+
+/*
+ * This is the function that is called when a 'rmdir' command
+ * is issued under our filesystem
+ */
+static void rgcs_rgroup_release_item(struct config_item *item)
+{
+ struct rgcs_rgroup *rgroup = item_to_rgcs_rgroup(item);
+
+ free_res_group(rgroup->core);
+ kfree(rgroup->name);
+ kfree(rgroup);
+}
+
+static struct configfs_item_operations rgcs_rgroup_item_ops = {
+ .release = rgcs_rgroup_release_item,
+};
+
+static struct configfs_group_operations rgcs_rgroup_group_ops = {
+ .make_group = make_rgcs_rgroup,
+};
+
+static struct config_item_type rgcs_item_type = {
+ .ct_owner = THIS_MODULE,
+ .ct_item_ops = &rgcs_rgroup_item_ops,
+ .ct_group_ops = &rgcs_rgroup_group_ops,
+};
+
+static struct configfs_subsystem rgcs_subsys = {
+ .su_group = {
+ .cg_item = {
+ .ci_namebuf = "res_groups",
+ .ci_type = &rgcs_item_type,
+ }
+ }
+};
+
+static int __init rgcs_init(void)
+{
+ config_group_init(&rgcs_subsys.su_group);
+ init_MUTEX(&rgcs_subsys.su_sem);
+ return configfs_register_subsystem(&rgcs_subsys);
+}
+
+static void __exit rgcs_exit(void)
+{
+ configfs_unregister_subsystem(&rgcs_subsys);
+ res_group_teardown();
+}
+
+late_initcall(rgcs_init);
+module_exit(rgcs_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("RGCS - Provides an interface to Resource Groups"
+ " and allows control of their resource usage");
Index: linux-2617-rc3/kernel/res_group/Makefile
===================================================================
--- linux-2617-rc3.orig/kernel/res_group/Makefile 2006-04-27 09:22:16.000000000 -0700
+++ linux-2617-rc3/kernel/res_group/Makefile 2006-04-27 10:14:38.000000000 -0700
@@ -1 +1,2 @@
obj-y = res_group.o shares.o task.o
+obj-$(CONFIG_RGCS) += rgcs.o