1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/llite/remote_perm.c
38 * Lustre Permission Cache for Remote Client
40 * Author: Lai Siyao <lsy@clusterfs.com>
41 * Author: Fan Yong <fanyong@clusterfs.com>
44 #define DEBUG_SUBSYSTEM S_LLITE
46 #include <linux/module.h>
47 #include <linux/types.h>
48 #include <linux/random.h>
49 #include <linux/version.h>
51 #include <lustre_lite.h>
52 #include <lustre_ha.h>
53 #include <lustre_dlm.h>
54 #include <lprocfs_status.h>
55 #include <lustre_disk.h>
56 #include <lustre_param.h>
57 #include "llite_internal.h"
59 cfs_mem_cache_t *ll_remote_perm_cachep = NULL;
60 cfs_mem_cache_t *ll_rmtperm_hash_cachep = NULL;
62 static inline struct ll_remote_perm *alloc_ll_remote_perm(void)
64 struct ll_remote_perm *lrp;
66 OBD_SLAB_ALLOC_PTR_GFP(lrp, ll_remote_perm_cachep, GFP_KERNEL);
68 INIT_HLIST_NODE(&lrp->lrp_list);
72 static inline void free_ll_remote_perm(struct ll_remote_perm *lrp)
77 if (!hlist_unhashed(&lrp->lrp_list))
78 hlist_del(&lrp->lrp_list);
79 OBD_SLAB_FREE(lrp, ll_remote_perm_cachep, sizeof(*lrp));
82 struct hlist_head *alloc_rmtperm_hash(void)
84 struct hlist_head *hash;
87 OBD_SLAB_ALLOC(hash, ll_rmtperm_hash_cachep, GFP_KERNEL,
88 REMOTE_PERM_HASHSIZE * sizeof(*hash));
93 for (i = 0; i < REMOTE_PERM_HASHSIZE; i++)
94 INIT_HLIST_HEAD(hash + i);
99 void free_rmtperm_hash(struct hlist_head *hash)
102 struct ll_remote_perm *lrp;
103 struct hlist_node *node, *next;
108 for (i = 0; i < REMOTE_PERM_HASHSIZE; i++)
109 hlist_for_each_entry_safe(lrp, node, next, hash + i, lrp_list)
110 free_ll_remote_perm(lrp);
111 OBD_SLAB_FREE(hash, ll_rmtperm_hash_cachep,
112 REMOTE_PERM_HASHSIZE * sizeof(*hash));
115 static inline int remote_perm_hashfunc(uid_t uid)
117 return uid & (REMOTE_PERM_HASHSIZE - 1);
120 /* NB: setxid permission is not checked here, instead it's done on
121 * MDT when client get remote permission. */
122 static int do_check_remote_perm(struct ll_inode_info *lli, int mask)
124 struct hlist_head *head;
125 struct ll_remote_perm *lrp;
126 struct hlist_node *node;
130 if (!lli->lli_remote_perms)
133 head = lli->lli_remote_perms + remote_perm_hashfunc(current->uid);
135 spin_lock(&lli->lli_lock);
136 hlist_for_each_entry(lrp, node, head, lrp_list) {
137 if (lrp->lrp_uid != current->uid)
139 if (lrp->lrp_gid != current->gid)
141 if (lrp->lrp_fsuid != current->fsuid)
143 if (lrp->lrp_fsgid != current->fsgid)
150 GOTO(out, rc = -ENOENT);
152 CDEBUG(D_SEC, "found remote perm: %u/%u/%u/%u - %#x\n",
153 lrp->lrp_uid, lrp->lrp_gid, lrp->lrp_fsuid, lrp->lrp_fsgid,
154 lrp->lrp_access_perm);
155 rc = ((lrp->lrp_access_perm & mask) == mask) ? 0 : -EACCES;
158 spin_unlock(&lli->lli_lock);
162 int ll_update_remote_perm(struct inode *inode, struct mdt_remote_perm *perm)
164 struct ll_inode_info *lli = ll_i2info(inode);
165 struct ll_remote_perm *lrp = NULL, *tmp = NULL;
166 struct hlist_head *head, *perm_hash = NULL;
167 struct hlist_node *node;
170 LASSERT(ll_i2sbi(inode)->ll_flags & LL_SBI_RMT_CLIENT);
173 if (perm->rp_uid != current->uid ||
174 perm->rp_gid != current->gid ||
175 perm->rp_fsuid != current->fsuid ||
176 perm->rp_fsgid != current->fsgid) {
177 /* user might setxid in this small period */
179 "remote perm user %u/%u/%u/%u != current %u/%u/%u/%u\n",
180 perm->rp_uid, perm->rp_gid, perm->rp_fsuid,
181 perm->rp_fsgid, current->uid, current->gid,
182 current->fsuid, current->fsgid);
187 if (!lli->lli_remote_perms) {
188 perm_hash = alloc_rmtperm_hash();
189 if (perm_hash == NULL) {
190 CERROR("alloc lli_remote_perms failed!\n");
195 spin_lock(&lli->lli_lock);
197 if (!lli->lli_remote_perms)
198 lli->lli_remote_perms = perm_hash;
200 free_rmtperm_hash(perm_hash);
202 head = lli->lli_remote_perms + remote_perm_hashfunc(perm->rp_uid);
205 hlist_for_each_entry(tmp, node, head, lrp_list) {
206 if (tmp->lrp_uid != perm->rp_uid)
208 if (tmp->lrp_gid != perm->rp_gid)
210 if (tmp->lrp_fsuid != perm->rp_fsuid)
212 if (tmp->lrp_fsgid != perm->rp_fsgid)
215 free_ll_remote_perm(lrp);
221 spin_unlock(&lli->lli_lock);
222 lrp = alloc_ll_remote_perm();
224 CERROR("alloc memory for ll_remote_perm failed!\n");
227 spin_lock(&lli->lli_lock);
231 lrp->lrp_access_perm = perm->rp_access_perm;
233 lrp->lrp_uid = perm->rp_uid;
234 lrp->lrp_gid = perm->rp_gid;
235 lrp->lrp_fsuid = perm->rp_fsuid;
236 lrp->lrp_fsgid = perm->rp_fsgid;
237 hlist_add_head(&lrp->lrp_list, head);
239 lli->lli_rmtperm_utime = jiffies;
240 spin_unlock(&lli->lli_lock);
242 CDEBUG(D_SEC, "new remote perm@%p: %u/%u/%u/%u - %#x\n",
243 lrp, lrp->lrp_uid, lrp->lrp_gid, lrp->lrp_fsuid, lrp->lrp_fsgid,
244 lrp->lrp_access_perm);
249 int lustre_check_remote_perm(struct inode *inode, int mask)
251 struct ll_inode_info *lli = ll_i2info(inode);
252 struct ll_sb_info *sbi = ll_i2sbi(inode);
253 struct ptlrpc_request *req = NULL;
254 struct mdt_remote_perm *perm;
261 utime = lli->lli_rmtperm_utime;
262 rc = do_check_remote_perm(lli, mask);
263 if (!rc || (rc != -ENOENT && i))
268 down(&lli->lli_rmtperm_sem);
270 if (utime != lli->lli_rmtperm_utime) {
271 rc = do_check_remote_perm(lli, mask);
272 if (!rc || (rc != -ENOENT && i)) {
273 up(&lli->lli_rmtperm_sem);
279 CERROR("check remote perm falls in dead loop!\n");
283 oc = ll_mdscapa_get(inode);
284 rc = md_get_remote_perm(sbi->ll_md_exp, ll_inode2fid(inode), oc,
285 ll_i2suppgid(inode), &req);
288 up(&lli->lli_rmtperm_sem);
292 perm = req_capsule_server_swab_get(&req->rq_pill, &RMF_ACL,
293 lustre_swab_mdt_remote_perm);
294 if (unlikely(perm == NULL)) {
295 up(&lli->lli_rmtperm_sem);
300 rc = ll_update_remote_perm(inode, perm);
301 up(&lli->lli_rmtperm_sem);
305 ptlrpc_req_finished(req);
308 ptlrpc_req_finished(req);
312 #if 0 /* NB: remote perms can't be freed in ll_mdc_blocking_ast of UPDATE lock,
313 * because it will fail sanity test 48.
315 void ll_free_remote_perms(struct inode *inode)
317 struct ll_inode_info *lli = ll_i2info(inode);
318 struct hlist_head *hash = lli->lli_remote_perms;
319 struct ll_remote_perm *lrp;
320 struct hlist_node *node, *next;
325 spin_lock(&lli->lli_lock);
327 for (i = 0; i < REMOTE_PERM_HASHSIZE; i++) {
328 hlist_for_each_entry_safe(lrp, node, next, hash + i, lrp_list)
329 free_ll_remote_perm(lrp);
332 spin_unlock(&lli->lli_lock);