[RFC] [PATCH 08/12] Add attribute support to RCFS

sekharan
2006-04-21T02:32:51Z

08/12 - ckrm_configfs_rcfs_attr_support

Adds the basic attribute store and show functions.
--

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>

kernel/ckrm/ckrm_rcfs.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 50 insertions(+), 1 deletion(-)

Index: linux2617-rc2/kernel/ckrm/ckrm_rcfs.c
===================================================================
--- linux2617-rc2.orig/kernel/ckrm/ckrm_rcfs.c
+++ linux2617-rc2/kernel/ckrm/ckrm_rcfs.c
@@ -14,13 +14,21 @@
* as published by the Free Software Foundation.
*
*/
+#include <linux/ctype.h>
#include <linux/module.h>
#include <linux/configfs.h>
+#include <linux/parser.h>
#include "ckrm_local.h"

static struct configfs_subsystem rcfs_subsys;
static struct config_item_type rcfs_class_type;

+struct class_attribute {
+ struct configfs_attribute configfs_attr;
+ ssize_t (*show)(struct ckrm_class *, char *);
+ int (*store)(struct ckrm_class *, const char *);
+};
+
struct rcfs_class {
char *name;
struct ckrm_class *core;
@@ -56,6 +64,40 @@ static inline struct ckrm_class *item_to
return group_to_ckrm_class(to_config_group(item));
}

+static ssize_t rcfs_attr_show(struct config_item *item,
+ struct configfs_attribute *attr, char *buf)
+{
+ struct class_attribute *class_attr;
+ struct ckrm_class *class = item_to_ckrm_class(item);
+
+ class_attr = container_of(attr, struct class_attribute, configfs_attr);
+ return class_attr->show(class, buf);
+}
+
+static ssize_t rcfs_attr_store(struct config_item *item,
+ struct configfs_attribute *attr, const char *buf,
+ size_t count)
+{
+ char *filtered_buf, *p;
+ ssize_t rc;
+ struct class_attribute *class_attr;
+ struct ckrm_class *class = item_to_ckrm_class(item);
+
+ class_attr = container_of(attr, struct class_attribute, configfs_attr);
+ filtered_buf = kzalloc(count + 1, GFP_KERNEL);
+ if (!filtered_buf)
+ return -ENOMEM;
+ strncpy(filtered_buf, buf, count);
+ for (p = filtered_buf; isprint(*p); ++p)
+ ;
+ *p = '\0';
+ rc = class_attr->store(class, filtered_buf);
+ kfree(filtered_buf);
+ if (rc)
+ return rc;
+ return count;
+}
+
/*
* This is the function that is called when a 'mkdir' command
* is issued under our filesystem
@@ -117,17 +159,24 @@ static void rcfs_class_release_item(stru
}

static struct configfs_item_operations rcfs_class_item_ops = {
- .release = rcfs_class_release_item,
+ .release = rcfs_class_release_item,
+ .show_attribute = rcfs_attr_show,
+ .store_attribute = rcfs_attr_store,
};

static struct configfs_group_operations rcfs_class_group_ops = {
.make_group = make_rcfs_class,
};

+static struct configfs_attribute *class_attrs[] = {
+ NULL
+};
+
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,
+ .ct_attrs = class_attrs
};

static struct configfs_subsystem rcfs_subsys = {