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13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
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27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
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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/version.h>
50 #include <lustre_lite.h>
51 #include <lustre_ha.h>
52 #include <lustre_dlm.h>
53 #include <lprocfs_status.h>
54 #include <lustre_disk.h>
55 #include <lustre_param.h>
56 #include "llite_internal.h"
58 struct kmem_cache *ll_remote_perm_cachep = NULL;
59 struct kmem_cache *ll_rmtperm_hash_cachep = NULL;
61 static inline struct ll_remote_perm *alloc_ll_remote_perm(void)
63 struct ll_remote_perm *lrp;
65 OBD_SLAB_ALLOC_PTR_GFP(lrp, ll_remote_perm_cachep, GFP_KERNEL);
67 INIT_HLIST_NODE(&lrp->lrp_list);
71 static inline void free_ll_remote_perm(struct ll_remote_perm *lrp)
76 if (!hlist_unhashed(&lrp->lrp_list))
77 hlist_del(&lrp->lrp_list);
78 OBD_SLAB_FREE(lrp, ll_remote_perm_cachep, sizeof(*lrp));
81 struct hlist_head *alloc_rmtperm_hash(void)
83 struct hlist_head *hash;
86 OBD_SLAB_ALLOC_GFP(hash, ll_rmtperm_hash_cachep,
87 REMOTE_PERM_HASHSIZE * sizeof(*hash),
92 for (i = 0; i < REMOTE_PERM_HASHSIZE; i++)
93 INIT_HLIST_HEAD(hash + i);
98 void free_rmtperm_hash(struct hlist_head *hash)
101 struct ll_remote_perm *lrp;
102 struct hlist_node *next;
107 for (i = 0; i < REMOTE_PERM_HASHSIZE; i++)
108 hlist_for_each_entry_safe(lrp, next, hash + i,
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;
129 if (!lli->lli_remote_perms)
132 head = lli->lli_remote_perms +
133 remote_perm_hashfunc(from_kuid(&init_user_ns, current_uid()));
135 spin_lock(&lli->lli_lock);
136 hlist_for_each_entry(lrp, head, lrp_list) {
137 if (lrp->lrp_uid != from_kuid(&init_user_ns, current_uid()))
139 if (lrp->lrp_gid != from_kgid(&init_user_ns, current_gid()))
141 if (lrp->lrp_fsuid != from_kuid(&init_user_ns, current_fsuid()))
143 if (lrp->lrp_fsgid != from_kgid(&init_user_ns, 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;
169 LASSERT(ll_i2sbi(inode)->ll_flags & LL_SBI_RMT_CLIENT);
172 if (perm->rp_uid != current->uid ||
173 perm->rp_gid != current->gid ||
174 perm->rp_fsuid != current->fsuid ||
175 perm->rp_fsgid != current->fsgid) {
176 /* user might setxid in this small period */
178 "remote perm user %u/%u/%u/%u != current %u/%u/%u/%u\n",
179 perm->rp_uid, perm->rp_gid, perm->rp_fsuid,
180 perm->rp_fsgid, current->uid, current->gid,
181 current->fsuid, current->fsgid);
186 if (!lli->lli_remote_perms) {
187 perm_hash = alloc_rmtperm_hash();
188 if (perm_hash == NULL) {
189 CERROR("alloc lli_remote_perms failed!\n");
194 spin_lock(&lli->lli_lock);
196 if (!lli->lli_remote_perms)
197 lli->lli_remote_perms = perm_hash;
199 free_rmtperm_hash(perm_hash);
201 head = lli->lli_remote_perms + remote_perm_hashfunc(perm->rp_uid);
204 hlist_for_each_entry(tmp, head, lrp_list) {
205 if (tmp->lrp_uid != perm->rp_uid)
207 if (tmp->lrp_gid != perm->rp_gid)
209 if (tmp->lrp_fsuid != perm->rp_fsuid)
211 if (tmp->lrp_fsgid != perm->rp_fsgid)
214 free_ll_remote_perm(lrp);
220 spin_unlock(&lli->lli_lock);
221 lrp = alloc_ll_remote_perm();
223 CERROR("alloc memory for ll_remote_perm failed!\n");
226 spin_lock(&lli->lli_lock);
230 lrp->lrp_access_perm = perm->rp_access_perm;
232 lrp->lrp_uid = perm->rp_uid;
233 lrp->lrp_gid = perm->rp_gid;
234 lrp->lrp_fsuid = perm->rp_fsuid;
235 lrp->lrp_fsgid = perm->rp_fsgid;
236 hlist_add_head(&lrp->lrp_list, head);
238 lli->lli_rmtperm_time = cfs_time_current();
239 spin_unlock(&lli->lli_lock);
241 CDEBUG(D_SEC, "new remote perm@%p: %u/%u/%u/%u - %#x\n",
242 lrp, lrp->lrp_uid, lrp->lrp_gid, lrp->lrp_fsuid, lrp->lrp_fsgid,
243 lrp->lrp_access_perm);
248 int lustre_check_remote_perm(struct inode *inode, int mask)
250 struct ll_inode_info *lli = ll_i2info(inode);
251 struct ll_sb_info *sbi = ll_i2sbi(inode);
252 struct ptlrpc_request *req = NULL;
253 struct mdt_remote_perm *perm;
260 save = lli->lli_rmtperm_time;
261 rc = do_check_remote_perm(lli, mask);
262 if (!rc || (rc != -ENOENT && i))
267 mutex_lock(&lli->lli_rmtperm_mutex);
269 if (save != lli->lli_rmtperm_time) {
270 rc = do_check_remote_perm(lli, mask);
271 if (!rc || (rc != -ENOENT && i)) {
272 mutex_unlock(&lli->lli_rmtperm_mutex);
278 CERROR("check remote perm falls in dead loop!\n");
282 oc = ll_mdscapa_get(inode);
283 rc = md_get_remote_perm(sbi->ll_md_exp, ll_inode2fid(inode), oc,
284 ll_i2suppgid(inode), &req);
287 mutex_unlock(&lli->lli_rmtperm_mutex);
291 perm = req_capsule_server_swab_get(&req->rq_pill, &RMF_ACL,
292 lustre_swab_mdt_remote_perm);
293 if (unlikely(perm == NULL)) {
294 mutex_unlock(&lli->lli_rmtperm_mutex);
299 rc = ll_update_remote_perm(inode, perm);
300 mutex_unlock(&lli->lli_rmtperm_mutex);
304 ptlrpc_req_finished(req);
307 ptlrpc_req_finished(req);
311 #if 0 /* NB: remote perms can't be freed in ll_mdc_blocking_ast of UPDATE lock,
312 * because it will fail sanity test 48.
314 void ll_free_remote_perms(struct inode *inode)
316 struct ll_inode_info *lli = ll_i2info(inode);
317 struct hlist_head *hash = lli->lli_remote_perms;
318 struct ll_remote_perm *lrp;
319 struct hlist_node *node, *next;
324 spin_lock(&lli->lli_lock);
326 for (i = 0; i < REMOTE_PERM_HASHSIZE; i++) {
327 hlist_for_each_entry_safe(lrp, node, next, hash + i,
329 free_ll_remote_perm(lrp);
332 spin_unlock(&lli->lli_lock);