Messages in this thread Patch in this message | | | From | Chandra Seetharaman <> | Date | Thu, 27 Apr 2006 18:34:49 -0700 | Subject | [PATCH 07/12] Resource Groups Configfs Subsystem (RGCS) |
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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 --
---------------------------------------------------------------------- Chandra Seetharaman | Be careful what you choose.... - sekharan@us.ibm.com | .......you may get it. ---------------------------------------------------------------------- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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