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/string.h>
  10#include "ext2.h"
  11#include "xattr.h"
  12
  13static size_t
  14ext2_xattr_user_list(struct dentry *dentry, char *list, size_t list_size,
  15                const char *name, size_t name_len, int type)
  16{
  17        const size_t prefix_len = XATTR_USER_PREFIX_LEN;
  18        const size_t total_len = prefix_len + name_len + 1;
  19
  20        if (!test_opt(dentry->d_sb, XATTR_USER))
  21                return 0;
  22
  23        if (list && total_len <= list_size) {
  24                memcpy(list, XATTR_USER_PREFIX, prefix_len);
  25                memcpy(list+prefix_len, name, name_len);
  26                list[prefix_len + name_len] = '\0';
  27        }
  28        return total_len;
  29}
  30
  31static int
  32ext2_xattr_user_get(struct dentry *dentry, const char *name,
  33                void *buffer, size_t size, int type)
  34{
  35        if (strcmp(name, "") == 0)
  36                return -EINVAL;
  37        if (!test_opt(dentry->d_sb, XATTR_USER))
  38                return -EOPNOTSUPP;
  39        return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_USER,
  40                              name, buffer, size);
  41}
  42
  43static int
  44ext2_xattr_user_set(struct dentry *dentry, const char *name,
  45                const void *value, size_t size, int flags, int type)
  46{
  47        if (strcmp(name, "") == 0)
  48                return -EINVAL;
  49        if (!test_opt(dentry->d_sb, XATTR_USER))
  50                return -EOPNOTSUPP;
  51
  52        return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_USER,
  53                              name, value, size, flags);
  54}
  55
  56const struct xattr_handler ext2_xattr_user_handler = {
  57        .prefix = XATTR_USER_PREFIX,
  58        .list   = ext2_xattr_user_list,
  59        .get    = ext2_xattr_user_get,
  60        .set    = ext2_xattr_user_set,
  61};
  62