LXR linux/fs/ext3/xattr

   1/*
   2 * linux/fs/ext3/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 "ext3.h"
   9#include "xattr.h"
  10
  11static size_t
  12ext3_xattr_user_list(struct dentry *dentry, char *list, size_t list_size,
  13                const char *name, size_t name_len, int type)
  14{
  15        const size_t prefix_len = XATTR_USER_PREFIX_LEN;
  16        const size_t total_len = prefix_len + name_len + 1;
  17
  18        if (!test_opt(dentry->d_sb, XATTR_USER))
  19                return 0;
  20
  21        if (list && total_len <= list_size) {
  22                memcpy(list, XATTR_USER_PREFIX, prefix_len);
  23                memcpy(list+prefix_len, name, name_len);
  24                list[prefix_len + name_len] = '\0';
  25        }
  26        return total_len;
  27}
  28
  29static int
  30ext3_xattr_user_get(struct dentry *dentry, const char *name, void *buffer,
  31                size_t size, int type)
  32{
  33        if (strcmp(name, "") == 0)
  34                return -EINVAL;
  35        if (!test_opt(dentry->d_sb, XATTR_USER))
  36                return -EOPNOTSUPP;
  37        return ext3_xattr_get(dentry->d_inode, EXT3_XATTR_INDEX_USER,
  38                              name, buffer, size);
  39}
  40
  41static int
  42ext3_xattr_user_set(struct dentry *dentry, const char *name,
  43                const void *value, size_t size, int flags, int type)
  44{
  45        if (strcmp(name, "") == 0)
  46                return -EINVAL;
  47        if (!test_opt(dentry->d_sb, XATTR_USER))
  48                return -EOPNOTSUPP;
  49        return ext3_xattr_set(dentry->d_inode, EXT3_XATTR_INDEX_USER,
  50                              name, value, size, flags);
  51}
  52
  53const struct xattr_handler ext3_xattr_user_handler = {
  54        .prefix = XATTR_USER_PREFIX,
  55        .list   = ext3_xattr_user_list,
  56        .get    = ext3_xattr_user_get,
  57        .set    = ext3_xattr_user_set,
  58};
  59