linux/fs/9p/xattr_trusted.c
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   1/*
   2 * Copyright IBM Corporation, 2010
   3 * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
   4 *
   5 * This program is free software; you can redistribute it and/or modify it
   6 * under the terms of version 2.1 of the GNU Lesser General Public License
   7 * as published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope that it would be useful, but
  10 * WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  12 *
  13 */
  14
  15
  16#include <linux/module.h>
  17#include <linux/string.h>
  18#include <linux/fs.h>
  19#include <linux/slab.h>
  20#include "xattr.h"
  21
  22static int v9fs_xattr_trusted_get(struct dentry *dentry, const char *name,
  23                        void *buffer, size_t size, int type)
  24{
  25        int retval;
  26        char *full_name;
  27        size_t name_len;
  28        size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
  29
  30        if (name == NULL)
  31                return -EINVAL;
  32
  33        if (strcmp(name, "") == 0)
  34                return -EINVAL;
  35
  36        name_len = strlen(name);
  37        full_name = kmalloc(prefix_len + name_len + 1 , GFP_KERNEL);
  38        if (!full_name)
  39                return -ENOMEM;
  40        memcpy(full_name, XATTR_TRUSTED_PREFIX, prefix_len);
  41        memcpy(full_name+prefix_len, name, name_len);
  42        full_name[prefix_len + name_len] = '\0';
  43
  44        retval = v9fs_xattr_get(dentry, full_name, buffer, size);
  45        kfree(full_name);
  46        return retval;
  47}
  48
  49static int v9fs_xattr_trusted_set(struct dentry *dentry, const char *name,
  50                        const void *value, size_t size, int flags, int type)
  51{
  52        int retval;
  53        char *full_name;
  54        size_t name_len;
  55        size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
  56
  57        if (name == NULL)
  58                return -EINVAL;
  59
  60        if (strcmp(name, "") == 0)
  61                return -EINVAL;
  62
  63        name_len = strlen(name);
  64        full_name = kmalloc(prefix_len + name_len + 1 , GFP_KERNEL);
  65        if (!full_name)
  66                return -ENOMEM;
  67        memcpy(full_name, XATTR_TRUSTED_PREFIX, prefix_len);
  68        memcpy(full_name + prefix_len, name, name_len);
  69        full_name[prefix_len + name_len] = '\0';
  70
  71        retval = v9fs_xattr_set(dentry, full_name, value, size, flags);
  72        kfree(full_name);
  73        return retval;
  74}
  75
  76struct xattr_handler v9fs_xattr_trusted_handler = {
  77        .prefix = XATTR_TRUSTED_PREFIX,
  78        .get    = v9fs_xattr_trusted_get,
  79        .set    = v9fs_xattr_trusted_set,
  80};
  81
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