64 static int fill_read_buffer(struct dentry * dentry, struct configfs_buffer * buffer)  in fill_read_buffer()  argument
71 	if (!buffer->page)  in fill_read_buffer()
72 		buffer->page = (char *) get_zeroed_page(GFP_KERNEL);  in fill_read_buffer()
73 	if (!buffer->page)  in fill_read_buffer()
76 	count = attr->show(item, buffer->page);  in fill_read_buffer()
78 	buffer->needs_read_fill = 0;  in fill_read_buffer()
81 		buffer->count = count;  in fill_read_buffer()
109 	struct configfs_buffer * buffer = file->private_data;  in configfs_read_file()  local
112 	mutex_lock(&buffer->mutex);  in configfs_read_file()
113 	if (buffer->needs_read_fill) {  in configfs_read_file()
114 		if ((retval = fill_read_buffer(file->f_path.dentry,buffer)))  in configfs_read_file()
118 		 __func__, count, *ppos, buffer->page);  in configfs_read_file()
119 	retval = simple_read_from_buffer(buf, count, ppos, buffer->page,  in configfs_read_file()
120 					 buffer->count);  in configfs_read_file()
122 	mutex_unlock(&buffer->mutex);  in configfs_read_file()
138 fill_write_buffer(struct configfs_buffer * buffer, const char __user * buf, size_t count)  in fill_write_buffer()  argument
142 	if (!buffer->page)  in fill_write_buffer()
143 		buffer->page = (char *)__get_free_pages(GFP_KERNEL, 0);  in fill_write_buffer()
144 	if (!buffer->page)  in fill_write_buffer()
149 	error = copy_from_user(buffer->page,buf,count);  in fill_write_buffer()
150 	buffer->needs_read_fill = 1;  in fill_write_buffer()
153 	buffer->page[count] = 0;  in fill_write_buffer()
170 flush_write_buffer(struct dentry * dentry, struct configfs_buffer * buffer, size_t count)  in flush_write_buffer()  argument
175 	return attr->store(item, buffer->page, count);  in flush_write_buffer()
199 	struct configfs_buffer * buffer = file->private_data;  in configfs_write_file()  local
202 	mutex_lock(&buffer->mutex);  in configfs_write_file()
203 	len = fill_write_buffer(buffer, buf, count);  in configfs_write_file()
205 		len = flush_write_buffer(file->f_path.dentry, buffer, len);  in configfs_write_file()
208 	mutex_unlock(&buffer->mutex);  in configfs_write_file()
216 	struct configfs_buffer * buffer;  in check_perm()  local
256 	buffer = kzalloc(sizeof(struct configfs_buffer),GFP_KERNEL);  in check_perm()
257 	if (!buffer) {  in check_perm()
261 	mutex_init(&buffer->mutex);  in check_perm()
262 	buffer->needs_read_fill = 1;  in check_perm()
263 	buffer->ops = ops;  in check_perm()
264 	file->private_data = buffer;  in check_perm()
290 	struct configfs_buffer * buffer = filp->private_data;  in configfs_release()  local
297 	if (buffer) {  in configfs_release()
298 		if (buffer->page)  in configfs_release()
299 			free_page((unsigned long)buffer->page);  in configfs_release()
300 		mutex_destroy(&buffer->mutex);  in configfs_release()
301 		kfree(buffer);  in configfs_release()