linux-curproc.c revision 9fdaf8c0b92ab374f8501eb47855776afc928e45 
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
85void 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
91void cfs_kernel_cap_unpack(kernel_cap_t *kcap, cfs_cap_t cap)
92{
93	kcap->cap[0] = cap;
94}
95
96cfs_cap_t cfs_curproc_cap_pack(void)
97{
98	cfs_cap_t cap;
99	cfs_kernel_cap_pack(current_cap(), &cap);
100	return cap;
101}
102
103EXPORT_SYMBOL(cfs_cap_raise);
104EXPORT_SYMBOL(cfs_cap_lower);
105EXPORT_SYMBOL(cfs_cap_raised);
106EXPORT_SYMBOL(cfs_curproc_cap_pack);
107
108/*
109 * Local variables:
110 * c-indentation-style: "K&R"
111 * c-basic-offset: 8
112 * tab-width: 8
113 * fill-column: 80
114 * scroll-step: 1
115 * End:
116 */
117