4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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.
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).
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.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2012, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * lustre/obdclass/idmap.c
34 * Lustre user identity mapping.
36 * Author: Fan Yong <fanyong@clusterfs.com>
39 #define DEBUG_SUBSYSTEM S_SEC
41 #include <linux/user_namespace.h>
42 #include <linux/uidgid.h>
44 #include <lustre_idmap.h>
45 #include <upcall_cache.h>
46 #include <md_object.h>
47 #include <obd_support.h>
50 * groups_search() is copied from linux kernel!
53 static int lustre_groups_search(struct group_info *group_info,
62 right = group_info->ngroups;
63 while (left < right) {
64 int mid = (left + right) / 2;
66 from_kgid(&init_user_ns, CFS_GROUP_AT(group_info, mid));
78 void lustre_groups_from_list(struct group_info *ginfo, gid_t *glist)
80 #ifdef HAVE_GROUP_INFO_GID
81 memcpy(ginfo->gid, glist, ginfo->ngroups * sizeof(__u32));
84 int count = ginfo->ngroups;
86 /* fill group_info from gid array */
87 for (i = 0; i < ginfo->nblocks && count > 0; i++) {
88 int cp_count = min(CFS_NGROUPS_PER_BLOCK, count);
89 int off = i * CFS_NGROUPS_PER_BLOCK;
90 int len = cp_count * sizeof(*glist);
92 memcpy(ginfo->blocks[i], glist + off, len);
97 EXPORT_SYMBOL(lustre_groups_from_list);
99 /* groups_sort() is copied from linux kernel! */
100 /* a simple shell-metzner sort */
101 void lustre_groups_sort(struct group_info *group_info)
103 int base, max, stride;
104 int gidsetsize = group_info->ngroups;
106 for (stride = 1; stride < gidsetsize; stride = 3 * stride + 1)
111 max = gidsetsize - stride;
112 for (base = 0; base < max; base++) {
114 int right = left + stride;
115 gid_t tmp = from_kgid(&init_user_ns,
116 CFS_GROUP_AT(group_info, right));
119 tmp < from_kgid(&init_user_ns,
120 CFS_GROUP_AT(group_info, left))) {
121 CFS_GROUP_AT(group_info, right) =
122 CFS_GROUP_AT(group_info, left);
126 CFS_GROUP_AT(group_info, right) =
127 make_kgid(&init_user_ns, tmp);
132 EXPORT_SYMBOL(lustre_groups_sort);
134 int lustre_in_group_p(struct lu_ucred *mu, gid_t grp)
138 if (grp != mu->uc_fsgid) {
139 struct group_info *group_info = NULL;
141 if (mu->uc_ginfo || !mu->uc_identity ||
142 mu->uc_valid == UCRED_OLD)
143 if (grp == mu->uc_suppgids[0] ||
144 grp == mu->uc_suppgids[1])
148 group_info = mu->uc_ginfo;
149 else if (mu->uc_identity)
150 group_info = mu->uc_identity->mi_ginfo;
155 atomic_inc(&group_info->usage);
156 rc = lustre_groups_search(group_info, grp);
157 if (atomic_dec_and_test(&group_info->usage))
158 groups_free(group_info);
162 EXPORT_SYMBOL(lustre_in_group_p);