Messages in this thread Patch in this message | | | From | sekharan@us ... | Date | Thu, 20 Apr 2006 19:24:50 -0700 | Subject | [RFC] [PATCH 07/12] Configfs based filesystem user interface - RCFS |
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07/12 - ckrm_configfs_rcfs
Create the filesystem(RCFS) for managing CKRM. Hooks up with configfs. Provides functions for creating and deleting classes. --
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/ckrm/Makefile | 1 kernel/ckrm/ckrm_rcfs.c | 160 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 173 insertions(+)
Index: linux2617-rc2/init/Kconfig =================================================================== --- linux2617-rc2.orig/init/Kconfig +++ linux2617-rc2/init/Kconfig @@ -163,6 +163,18 @@ config CKRM If you say Y here, enable the Resource Class File System and at least one of the resource controllers below. Say N if you are unsure. +config CKRM_RCFS + tristate "Resource Control File System (User API for CKRM)" + depends on CKRM + select CONFIGFS_FS + default m + help + RCFS is the filesystem API for CKRM. Compiling it as a module permits + users to only load RCFS if they intend to use CKRM. + + Say M if unsure, Y to save on module loading. N doesn't make sense + when CKRM has been configured. + endmenu config SYSCTL bool "Sysctl support" Index: linux2617-rc2/kernel/ckrm/ckrm_rcfs.c =================================================================== --- /dev/null +++ linux2617-rc2/kernel/ckrm/ckrm_rcfs.c @@ -0,0 +1,160 @@ +/* + * kernel/ckrm/ckrm_rcfs.c + * + * Copyright (C) Shailabh Nagar, IBM Corp. 2005 + * Chandra Seetharaman, IBM Corp. 2005, 2006 + * + * Configfs based Resource class filesystem (rcfs) serving the + * user interface to Class-based Kernel Resource Management (CKRM). + * + * 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 "ckrm_local.h" + +static struct configfs_subsystem rcfs_subsys; +static struct config_item_type rcfs_class_type; + +struct rcfs_class { + char *name; + struct ckrm_class *core; + struct config_group group; +}; + +static inline struct rcfs_class *group_to_rcfs_class(struct config_group *grp) +{ + return container_of(grp, struct rcfs_class, group); +} + +static inline struct rcfs_class *item_to_rcfs_class(struct config_item *item) +{ + return group_to_rcfs_class(to_config_group(item)); +} + +static inline struct ckrm_class *group_to_ckrm_class(struct config_group *grp) +{ + struct rcfs_class *rclass; + /* + * A configfs wrinkle forces us to treat the root group as a special + * case instead of wrapping the group in a struct rcfs_class like all + * other groups. + */ + if (grp == &rcfs_subsys.su_group) + return &ckrm_default_class; + rclass = group_to_rcfs_class(grp); + return rclass->core; +} + +static inline struct ckrm_class *item_to_ckrm_class(struct config_item *item) +{ + return group_to_ckrm_class(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_rcfs_class(struct config_group *group, + const char *name) +{ + struct rcfs_class *rclass, *rc_par; + struct ckrm_class *core, *parent; + char *new_name = NULL, *par_name = NULL; + int par_sz = 0; + + rclass = kzalloc(sizeof(struct rcfs_class), GFP_KERNEL); + if (!rclass) + return NULL; + + parent = group_to_ckrm_class(group); + + if (parent != &ckrm_default_class) { + rc_par = group_to_rcfs_class(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 = ckrm_alloc_class(parent, new_name); + if (!core) + goto nocore; + rclass->core = core; + rclass->name = new_name; + + config_group_init_type_name(&rclass->group, name, &rcfs_class_type); + return &rclass->group; + +nocore: + kfree(new_name); +noname: + kfree(rclass); + return NULL; +} + +/* + * This is the function that is called when a 'rmdir' command + * is issued under our filesystem + */ +static void rcfs_class_release_item(struct config_item *item) +{ + struct rcfs_class *rclass = item_to_rcfs_class(item); + + ckrm_free_class(rclass->core); + kfree(rclass->name); + kfree(rclass); +} + +static struct configfs_item_operations rcfs_class_item_ops = { + .release = rcfs_class_release_item, +}; + +static struct configfs_group_operations rcfs_class_group_ops = { + .make_group = make_rcfs_class, +}; + +static struct config_item_type rcfs_class_type = { + .ct_owner = THIS_MODULE, + .ct_item_ops = &rcfs_class_item_ops, + .ct_group_ops = &rcfs_class_group_ops, +}; + +static struct configfs_subsystem rcfs_subsys = { + .su_group = { + .cg_item = { + .ci_namebuf = "ckrm", + .ci_type = &rcfs_class_type, + } + } +}; + +static int __init rcfs_init(void) +{ + config_group_init(&rcfs_subsys.su_group); + init_MUTEX(&rcfs_subsys.su_sem); + return configfs_register_subsystem(&rcfs_subsys); +} + +static void __exit rcfs_exit(void) +{ + configfs_unregister_subsystem(&rcfs_subsys); + ckrm_teardown(); +} + +late_initcall(rcfs_init); +module_exit(rcfs_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("RCFS - Provides an interface to classes and allows control " + "of their resource usage"); Index: linux2617-rc2/kernel/ckrm/Makefile =================================================================== --- linux2617-rc2.orig/kernel/ckrm/Makefile +++ linux2617-rc2/kernel/ckrm/Makefile @@ -1 +1,2 @@ obj-y = ckrm.o ckrm_shares.o ckrm_task.o +obj-$(CONFIG_CKRM_RCFS) += ckrm_rcfs.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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