[PATCH] sample_configfs: bin_file read and write

[SunKe]

Add bin_file read and write function

Signed-off-by: SunKe <sunk...@huawei.com>
---
 samples/configfs/configfs_sample.c | 43 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/samples/configfs/configfs_sample.c 
b/samples/configfs/configfs_sample.c
index 004a4e2..c76b784 100644
--- a/samples/configfs/configfs_sample.c
+++ b/samples/configfs/configfs_sample.c
@@ -146,6 +146,8 @@ static struct childless childless_subsys = {
 struct simple_child {
        struct config_item item;
        int storeme;
+       void *data;
+       size_t len;
 };
 
 static inline struct simple_child *to_simple_child(struct config_item *item)
@@ -153,6 +155,46 @@ static inline struct simple_child *to_simple_child(struct 
config_item *item)
        return item ? container_of(item, struct simple_child, item) : NULL;
 }
 
+static ssize_t simple_child_bin_storeme_bin_write(struct config_item *item,
+                                   const void *data, size_t size)
+{
+       struct simple_child *simple_child = to_simple_child(item);
+
+       kfree(simple_child->data);
+       simple_child->data = NULL;
+
+       simple_child->data = kmemdup(data, size, GFP_KERNEL);
+       if (!simple_child->data)
+               return -ENOMEM;
+       simple_child->len = size;
+
+       return 0;
+}
+
+static ssize_t simple_child_bin_storeme_bin_read(struct config_item *item,
+                                  void *data, size_t size)
+{
+       struct simple_child *simple_child = to_simple_child(item);
+
+       if (!data) {
+               size = simple_child->len;
+       } else {
+               memcpy(data, simple_child->data, simple_child->len);
+               size = simple_child->len;
+       }
+
+       return size;
+}
+
+#define MAX_SIZE (128 * 1024)
+
+CONFIGFS_BIN_ATTR(simple_child_bin_, storeme_bin, NULL, MAX_SIZE);
+
+static struct configfs_bin_attribute *simple_child_bin_attrs[] = {
+       &simple_child_bin_attr_storeme_bin,
+       NULL,
+};
+
 static ssize_t simple_child_storeme_show(struct config_item *item, char *page)
 {
        return sprintf(page, "%d\n", to_simple_child(item)->storeme);
@@ -196,6 +238,7 @@ static struct configfs_item_operations 
simple_child_item_ops = {
 static const struct config_item_type simple_child_type = {
        .ct_item_ops    = &simple_child_item_ops,
        .ct_attrs       = simple_child_attrs,
+       .ct_bin_attrs   = simple_child_bin_attrs,
        .ct_owner       = THIS_MODULE,
 };
 
-- 
2.7.4