LXR linux/fs/ext2/xattr

   1/*
   2 * linux/fs/ext2/xattr_user.c
   3 * Handler for extended user attributes.
   4 *
   5 * Copyright (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
   6 */
   7
   8#include <linux/init.h>
   9#include <linux/module.h>
  10#include <linux/string.h>
  11#include "ext2.h"
  12#include "xattr.h"
  13
  14#define XATTR_USER_PREFIX "user."
  15
  16static size_t
  17ext2_xattr_user_list(struct inode *inode, char *list, size_t list_size,
  18                     const char *name, size_t name_len)
  19{
  20        const size_t prefix_len = sizeof(XATTR_USER_PREFIX)-1;
  21        const size_t total_len = prefix_len + name_len + 1;
  22
  23        if (!test_opt(inode->i_sb, XATTR_USER))
  24                return 0;
  25
  26        if (list && total_len <= list_size) {
  27                memcpy(list, XATTR_USER_PREFIX, prefix_len);
  28                memcpy(list+prefix_len, name, name_len);
  29                list[prefix_len + name_len] = '\0';
  30        }
  31        return total_len;
  32}
  33
  34static int
  35ext2_xattr_user_get(struct inode *inode, const char *name,
  36                    void *buffer, size_t size)
  37{
  38        if (strcmp(name, "") == 0)
  39                return -EINVAL;
  40        if (!test_opt(inode->i_sb, XATTR_USER))
  41                return -EOPNOTSUPP;
  42        return ext2_xattr_get(inode, EXT2_XATTR_INDEX_USER, name, buffer, size);
  43}
  44
  45static int
  46ext2_xattr_user_set(struct inode *inode, const char *name,
  47                    const void *value, size_t size, int flags)
  48{
  49        if (strcmp(name, "") == 0)
  50                return -EINVAL;
  51        if (!test_opt(inode->i_sb, XATTR_USER))
  52                return -EOPNOTSUPP;
  53
  54        return ext2_xattr_set(inode, EXT2_XATTR_INDEX_USER, name,
  55                              value, size, flags);
  56}
  57
  58struct xattr_handler ext2_xattr_user_handler = {
  59        .prefix = XATTR_USER_PREFIX,
  60        .list   = ext2_xattr_user_list,
  61        .get    = ext2_xattr_user_get,
  62        .set    = ext2_xattr_user_set,
  63};
  64