vfs: Distinguish between full xattr names and proper prefixes

[linux-2.6-block.git] / fs / jffs2 / xattr_user.c

/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright © 2006  NEC Corporation
 *
 * Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
 *
 * For licensing information, see the file 'LICENCE' in this directory.
 *
 */

#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/jffs2.h>
#include <linux/xattr.h>
#include <linux/mtd/mtd.h>
#include "nodelist.h"

static int jffs2_user_getxattr(const struct xattr_handler *handler,
			       struct dentry *dentry, const char *name,
			       void *buffer, size_t size)
{
	return do_jffs2_getxattr(d_inode(dentry), JFFS2_XPREFIX_USER,
				 name, buffer, size);
}

static int jffs2_user_setxattr(const struct xattr_handler *handler,
			       struct dentry *dentry, const char *name,
			       const void *buffer, size_t size, int flags)
{
	return do_jffs2_setxattr(d_inode(dentry), JFFS2_XPREFIX_USER,
				 name, buffer, size, flags);
}

static size_t jffs2_user_listxattr(const struct xattr_handler *handler,
				   struct dentry *dentry, char *list,
				   size_t list_size, const char *name,
				   size_t name_len)
{
	size_t retlen = XATTR_USER_PREFIX_LEN + name_len + 1;

	if (list && retlen <= list_size) {
		strcpy(list, XATTR_USER_PREFIX);
		strcpy(list + XATTR_USER_PREFIX_LEN, name);
	}

	return retlen;
}

const struct xattr_handler jffs2_user_xattr_handler = {
	.prefix = XATTR_USER_PREFIX,
	.list = jffs2_user_listxattr,
	.set = jffs2_user_setxattr,
	.get = jffs2_user_getxattr
};