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/*

 * linux/fs/ext4/xattr_user.c

 * Handler for extended user attributes.

 *

 * Copyright (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>

 */

#include <linux/module.h>

#include <linux/string.h>

#include <linux/fs.h>

#include <linux/ext4_jbd2.h>

#include <linux/ext4_fs.h>

#include "xattr.h"

#define XATTR_USER_PREFIX "user."

static size_t

ext4_xattr_user_list(struct inode *inode, char *list, size_t list_size,

                     const char *name, size_t name_len)

{

        const size_t prefix_len = sizeof(XATTR_USER_PREFIX)-1;

        const size_t total_len = prefix_len + name_len + 1;

        if (!test_opt(inode->i_sb, XATTR_USER))

                return 0;

        if (list && total_len <= list_size) {

                memcpy(list, XATTR_USER_PREFIX, prefix_len);

                memcpy(list+prefix_len, name, name_len);

                list[prefix_len + name_len] = '\0';

        }

        return total_len;

}

static int

ext4_xattr_user_get(struct inode *inode, const char *name,

                    void *buffer, size_t size)

{

        if (strcmp(name, "") == 0)

                return -EINVAL;

        if (!test_opt(inode->i_sb, XATTR_USER))

                return -EOPNOTSUPP;

        return ext4_xattr_get(inode, EXT4_XATTR_INDEX_USER, name, buffer, size);

}

static int

ext4_xattr_user_set(struct inode *inode, const char *name,

                    const void *value, size_t size, int flags)

{

        if (strcmp(name, "") == 0)

                return -EINVAL;

        if (!test_opt(inode->i_sb, XATTR_USER))

                return -EOPNOTSUPP;

        return ext4_xattr_set(inode, EXT4_XATTR_INDEX_USER, name,

                              value, size, flags);

}

struct xattr_handler ext4_xattr_user_handler = {

        .prefix = XATTR_USER_PREFIX,

        .list   = ext4_xattr_user_list,

        .get    = ext4_xattr_user_get,

        .set    = ext4_xattr_user_set,

};