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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/
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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 cfs_mem_cache_t *ll_remote_perm_cachep = NULL;
59 cfs_mem_cache_t *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, CFS_ALLOC_KERNEL);
67 CFS_INIT_HLIST_NODE(&lrp->lrp_list);
71 static inline void free_ll_remote_perm(struct ll_remote_perm *lrp)
76 if (!cfs_hlist_unhashed(&lrp->lrp_list))
77 cfs_hlist_del(&lrp->lrp_list);
78 OBD_SLAB_FREE(lrp, ll_remote_perm_cachep, sizeof(*lrp));
81 cfs_hlist_head_t *alloc_rmtperm_hash(void)
83 cfs_hlist_head_t *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 CFS_INIT_HLIST_HEAD(hash + i);
98 void free_rmtperm_hash(cfs_hlist_head_t *hash)
101 struct ll_remote_perm *lrp;
102 cfs_hlist_node_t *node, *next;
107 for (i = 0; i < REMOTE_PERM_HASHSIZE; i++)
108 cfs_hlist_for_each_entry_safe(lrp, node, 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 cfs_hlist_head_t *head;
125 struct ll_remote_perm *lrp;
126 cfs_hlist_node_t *node;
130 if (!lli->lli_remote_perms)
133 head = lli->lli_remote_perms + remote_perm_hashfunc(cfs_curproc_uid());
135 spin_lock(&lli->lli_lock);
136 cfs_hlist_for_each_entry(lrp, node, head, lrp_list) {
137 if (lrp->lrp_uid != cfs_curproc_uid())
139 if (lrp->lrp_gid != cfs_curproc_gid())
141 if (lrp->lrp_fsuid != cfs_curproc_fsuid())
143 if (lrp->lrp_fsgid != cfs_curproc_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 cfs_hlist_head_t *head, *perm_hash = NULL;
167 cfs_hlist_node_t *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 cfs_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 cfs_hlist_add_head(&lrp->lrp_list, head);
239 lli->lli_rmtperm_time = cfs_time_current();
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 save = lli->lli_rmtperm_time;
262 rc = do_check_remote_perm(lli, mask);
263 if (!rc || (rc != -ENOENT && i))
268 mutex_lock(&lli->lli_rmtperm_mutex);
270 if (save != lli->lli_rmtperm_time) {
271 rc = do_check_remote_perm(lli, mask);
272 if (!rc || (rc != -ENOENT && i)) {
273 mutex_unlock(&lli->lli_rmtperm_mutex);
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 mutex_unlock(&lli->lli_rmtperm_mutex);
292 perm = req_capsule_server_swab_get(&req->rq_pill, &RMF_ACL,
293 lustre_swab_mdt_remote_perm);
294 if (unlikely(perm == NULL)) {
295 mutex_unlock(&lli->lli_rmtperm_mutex);
300 rc = ll_update_remote_perm(inode, perm);
301 mutex_unlock(&lli->lli_rmtperm_mutex);
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 cfs_hlist_head_t *hash = lli->lli_remote_perms;
319 struct ll_remote_perm *lrp;
320 cfs_hlist_node_t *node, *next;
325 spin_lock(&lli->lli_lock);
327 for (i = 0; i < REMOTE_PERM_HASHSIZE; i++) {
328 cfs_hlist_for_each_entry_safe(lrp, node, next, hash + i,
330 free_ll_remote_perm(lrp);
333 spin_unlock(&lli->lli_lock);