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) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2011, 2016, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * lustre/mdt/mdt_identity.c
34 * Author: Lai Siyao <lsy@clusterfs.com>
35 * Author: Fan Yong <fanyong@clusterfs.com>
38 #define DEBUG_SUBSYSTEM S_MDS
40 #include "mdt_internal.h"
42 static void mdt_identity_entry_init(struct upcall_cache_entry *entry,
45 entry->u.identity.mi_uc_entry = entry;
48 static void mdt_identity_entry_free(struct upcall_cache *cache,
49 struct upcall_cache_entry *entry)
51 struct md_identity *identity = &entry->u.identity;
53 if (identity->mi_ginfo) {
54 put_group_info(identity->mi_ginfo);
55 identity->mi_ginfo = NULL;
58 if (identity->mi_nperms) {
59 LASSERT(identity->mi_perms);
60 OBD_FREE_PTR_ARRAY(identity->mi_perms, identity->mi_nperms);
61 identity->mi_nperms = 0;
65 static int mdt_identity_do_upcall(struct upcall_cache *cache,
66 struct upcall_cache_entry *entry)
70 [0] = cache->uc_upcall,
77 [1] = "PATH=/sbin:/usr/sbin",
84 /* There is race condition:
85 * "uc_upcall" was changed just after "is_identity_get_disabled" check.
87 down_read(&cache->uc_upcall_rwsem);
88 CDEBUG(D_INFO, "The upcall is: '%s'\n", cache->uc_upcall);
90 if (unlikely(!strcmp(cache->uc_upcall, "NONE"))) {
91 CERROR("no upcall set\n");
92 GOTO(out, rc = -EREMCHG);
95 argv[0] = cache->uc_upcall;
96 snprintf(keystr, sizeof(keystr), "%llu", entry->ue_key);
99 rc = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC);
102 CERROR("%s: error invoking upcall %s %s %s: rc %d; check /proc/fs/lustre/mdt/%s/identity_upcall, time %ldus\n",
103 cache->uc_name, argv[0], argv[1], argv[2], rc,
104 cache->uc_name, (long)ktime_us_delta(end, start));
106 CDEBUG(D_HA, "%s: invoked upcall %s %s %s, time %ldus\n",
107 cache->uc_name, argv[0], argv[1], argv[2],
108 (long)ktime_us_delta(end, start));
113 up_read(&cache->uc_upcall_rwsem);
117 static int mdt_identity_parse_downcall(struct upcall_cache *cache,
118 struct upcall_cache_entry *entry,
121 struct md_identity *identity = &entry->u.identity;
122 struct identity_downcall_data *data = args;
123 struct group_info *ginfo = NULL;
124 struct md_perm *perms = NULL;
129 if (data->idd_ngroups > NGROUPS_MAX)
132 if (data->idd_ngroups > 0) {
133 ginfo = groups_alloc(data->idd_ngroups);
135 CERROR("failed to alloc %d groups\n",
140 lustre_groups_from_list(ginfo, data->idd_groups);
141 lustre_groups_sort(ginfo);
144 if (data->idd_nperms) {
145 size = data->idd_nperms * sizeof(*perms);
146 OBD_ALLOC(perms, size);
148 CERROR("failed to alloc %d permissions\n",
151 put_group_info(ginfo);
155 for (i = 0; i < data->idd_nperms; i++) {
156 perms[i].mp_nid = data->idd_perms[i].pdd_nid;
157 perms[i].mp_perm = data->idd_perms[i].pdd_perm;
161 identity->mi_uid = data->idd_uid;
162 identity->mi_gid = data->idd_gid;
163 identity->mi_ginfo = ginfo;
164 identity->mi_nperms = data->idd_nperms;
165 identity->mi_perms = perms;
167 CDEBUG(D_OTHER, "parse mdt identity@%p: %d:%d, ngroups %u, nperms %u\n",
168 identity, identity->mi_uid, identity->mi_gid,
169 data->idd_ngroups, data->idd_nperms);
174 struct md_identity *mdt_identity_get(struct upcall_cache *cache, __u32 uid)
176 struct upcall_cache_entry *entry;
179 return ERR_PTR(-ENOENT);
181 entry = upcall_cache_get_entry(cache, (__u64)uid, NULL);
183 return ERR_PTR(PTR_ERR(entry));
184 else if (unlikely(!entry))
185 return ERR_PTR(-ENOENT);
187 return &entry->u.identity;
190 void mdt_identity_put(struct upcall_cache *cache, struct md_identity *identity)
196 upcall_cache_put_entry(cache, identity->mi_uc_entry);
199 struct upcall_cache_ops mdt_identity_upcall_cache_ops = {
200 .init_entry = mdt_identity_entry_init,
201 .free_entry = mdt_identity_entry_free,
202 .do_upcall = mdt_identity_do_upcall,
203 .parse_downcall = mdt_identity_parse_downcall,
206 void mdt_flush_identity(struct upcall_cache *cache, int uid)
209 upcall_cache_flush_idle(cache);
211 upcall_cache_flush_one(cache, (__u64)uid, NULL);
215 * If there is LNET_NID_ANY in perm[i].mp_nid,
216 * it must be perm[0].mp_nid, and act as default perm.
218 __u32 mdt_identity_get_perm(struct md_identity *identity, lnet_nid_t nid)
220 struct md_perm *perm;
224 return CFS_SETGRP_PERM;
226 perm = identity->mi_perms;
227 /* check exactly matched nid first */
228 for (i = identity->mi_nperms - 1; i > 0; i--) {
229 if (perm[i].mp_nid != nid)
231 return perm[i].mp_perm;
234 /* check LNET_NID_ANY then */
235 if ((identity->mi_nperms > 0) &&
236 ((perm[0].mp_nid == nid) || (perm[0].mp_nid == LNET_NID_ANY)))
237 return perm[0].mp_perm;
239 /* return default last */
240 return CFS_SETGRP_PERM;