LXR linux/drivers/staging/lustre/lustre/libcfs/linux/linux-curproc.c

   1/*
   2 * GPL HEADER START
   3 *
   4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 only,
   8 * as published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope that it will be useful, but
  11 * WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 * General Public License version 2 for more details (a copy is included
  14 * in the LICENSE file that accompanied this code).
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * version 2 along with this program; If not, see
  18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19 *
  20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21 * CA 95054 USA or visit www.sun.com if you need additional information or
  22 * have any questions.
  23 *
  24 * GPL HEADER END
  25 */
  26/*
  27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  28 * Use is subject to license terms.
  29 *
  30 * Copyright (c) 2011, 2012, Intel Corporation.
  31 */
  32/*
  33 * This file is part of Lustre, http://www.lustre.org/
  34 * Lustre is a trademark of Sun Microsystems, Inc.
  35 *
  36 * libcfs/libcfs/linux/linux-curproc.c
  37 *
  38 * Lustre curproc API implementation for Linux kernel
  39 *
  40 * Author: Nikita Danilov <nikita@clusterfs.com>
  41 */
  42
  43#include <linux/sched.h>
  44#include <linux/fs_struct.h>
  45
  46#include <linux/compat.h>
  47#include <linux/thread_info.h>
  48
  49#define DEBUG_SUBSYSTEM S_LNET
  50
  51#include "../../../include/linux/libcfs/libcfs.h"
  52
  53/*
  54 * Implementation of cfs_curproc API (see portals/include/libcfs/curproc.h)
  55 * for Linux kernel.
  56 */
  57
  58void cfs_cap_raise(cfs_cap_t cap)
  59{
  60        struct cred *cred;
  61
  62        cred = prepare_creds();
  63        if (cred) {
  64                cap_raise(cred->cap_effective, cap);
  65                commit_creds(cred);
  66        }
  67}
  68
  69void cfs_cap_lower(cfs_cap_t cap)
  70{
  71        struct cred *cred;
  72
  73        cred = prepare_creds();
  74        if (cred) {
  75                cap_lower(cred->cap_effective, cap);
  76                commit_creds(cred);
  77        }
  78}
  79
  80int cfs_cap_raised(cfs_cap_t cap)
  81{
  82        return cap_raised(current_cap(), cap);
  83}
  84
  85static void cfs_kernel_cap_pack(kernel_cap_t kcap, cfs_cap_t *cap)
  86{
  87        /* XXX lost high byte */
  88        *cap = kcap.cap[0];
  89}
  90
  91cfs_cap_t cfs_curproc_cap_pack(void)
  92{
  93        cfs_cap_t cap;
  94        cfs_kernel_cap_pack(current_cap(), &cap);
  95        return cap;
  96}
  97
  98EXPORT_SYMBOL(cfs_cap_raise);
  99EXPORT_SYMBOL(cfs_cap_lower);
 100EXPORT_SYMBOL(cfs_cap_raised);
 101EXPORT_SYMBOL(cfs_curproc_cap_pack);
 102
 103/*
 104 * Local variables:
 105 * c-indentation-style: "K&R"
 106 * c-basic-offset: 8
 107 * tab-width: 8
 108 * fill-column: 80
 109 * scroll-step: 1
 110 * End:
 111 */
 112