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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>
49 #include "../include/lustre_lite.h"
50 #include "../include/lustre_ha.h"
51 #include "../include/lustre_dlm.h"
52 #include "../include/lprocfs_status.h"
53 #include "../include/lustre_disk.h"
54 #include "../include/lustre_param.h"
55 #include "llite_internal.h"
57 struct kmem_cache *ll_remote_perm_cachep;
58 struct kmem_cache *ll_rmtperm_hash_cachep;
60 static inline struct ll_remote_perm *alloc_ll_remote_perm(void)
62 struct ll_remote_perm *lrp;
64 OBD_SLAB_ALLOC_PTR_GFP(lrp, ll_remote_perm_cachep, GFP_KERNEL);
66 INIT_HLIST_NODE(&lrp->lrp_list);
70 static inline void free_ll_remote_perm(struct ll_remote_perm *lrp)
75 if (!hlist_unhashed(&lrp->lrp_list))
76 hlist_del(&lrp->lrp_list);
77 OBD_SLAB_FREE(lrp, ll_remote_perm_cachep, sizeof(*lrp));
80 static struct hlist_head *alloc_rmtperm_hash(void)
82 struct hlist_head *hash;
85 OBD_SLAB_ALLOC_GFP(hash, ll_rmtperm_hash_cachep,
86 REMOTE_PERM_HASHSIZE * sizeof(*hash),
91 for (i = 0; i < REMOTE_PERM_HASHSIZE; i++)
92 INIT_HLIST_HEAD(hash + i);
97 void free_rmtperm_hash(struct hlist_head *hash)
100 struct ll_remote_perm *lrp;
101 struct hlist_node *next;
106 for (i = 0; i < REMOTE_PERM_HASHSIZE; i++)
107 hlist_for_each_entry_safe(lrp, next, hash + i, lrp_list)
108 free_ll_remote_perm(lrp);
109 OBD_SLAB_FREE(hash, ll_rmtperm_hash_cachep,
110 REMOTE_PERM_HASHSIZE * sizeof(*hash));
113 static inline int remote_perm_hashfunc(uid_t uid)
115 return uid & (REMOTE_PERM_HASHSIZE - 1);
118 /* NB: setxid permission is not checked here, instead it's done on
119 * MDT when client get remote permission.
121 static int do_check_remote_perm(struct ll_inode_info *lli, int mask)
123 struct hlist_head *head;
124 struct ll_remote_perm *lrp;
127 if (!lli->lli_remote_perms)
130 head = lli->lli_remote_perms +
131 remote_perm_hashfunc(from_kuid(&init_user_ns, current_uid()));
133 spin_lock(&lli->lli_lock);
134 hlist_for_each_entry(lrp, head, lrp_list) {
135 if (lrp->lrp_uid != from_kuid(&init_user_ns, current_uid()))
137 if (lrp->lrp_gid != from_kgid(&init_user_ns, current_gid()))
139 if (lrp->lrp_fsuid != from_kuid(&init_user_ns, current_fsuid()))
141 if (lrp->lrp_fsgid != from_kgid(&init_user_ns, current_fsgid()))
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;
168 LASSERT(ll_i2sbi(inode)->ll_flags & LL_SBI_RMT_CLIENT);
171 if (perm->rp_uid != current->uid ||
172 perm->rp_gid != current->gid ||
173 perm->rp_fsuid != current->fsuid ||
174 perm->rp_fsgid != current->fsgid) {
175 /* user might setxid in this small period */
177 "remote perm user %u/%u/%u/%u != current %u/%u/%u/%u\n",
178 perm->rp_uid, perm->rp_gid, perm->rp_fsuid,
179 perm->rp_fsgid, current->uid, current->gid,
180 current->fsuid, current->fsgid);
185 if (!lli->lli_remote_perms) {
186 perm_hash = alloc_rmtperm_hash();
188 CERROR("alloc lli_remote_perms failed!\n");
193 spin_lock(&lli->lli_lock);
195 if (!lli->lli_remote_perms)
196 lli->lli_remote_perms = perm_hash;
198 free_rmtperm_hash(perm_hash);
200 head = lli->lli_remote_perms + remote_perm_hashfunc(perm->rp_uid);
203 hlist_for_each_entry(tmp, head, lrp_list) {
204 if (tmp->lrp_uid != perm->rp_uid)
206 if (tmp->lrp_gid != perm->rp_gid)
208 if (tmp->lrp_fsuid != perm->rp_fsuid)
210 if (tmp->lrp_fsgid != perm->rp_fsgid)
212 free_ll_remote_perm(lrp);
218 spin_unlock(&lli->lli_lock);
219 lrp = alloc_ll_remote_perm();
221 CERROR("alloc memory for ll_remote_perm failed!\n");
224 spin_lock(&lli->lli_lock);
228 lrp->lrp_access_perm = perm->rp_access_perm;
230 lrp->lrp_uid = perm->rp_uid;
231 lrp->lrp_gid = perm->rp_gid;
232 lrp->lrp_fsuid = perm->rp_fsuid;
233 lrp->lrp_fsgid = perm->rp_fsgid;
234 hlist_add_head(&lrp->lrp_list, head);
236 lli->lli_rmtperm_time = cfs_time_current();
237 spin_unlock(&lli->lli_lock);
239 CDEBUG(D_SEC, "new remote perm@%p: %u/%u/%u/%u - %#x\n",
240 lrp, lrp->lrp_uid, lrp->lrp_gid, lrp->lrp_fsuid, lrp->lrp_fsgid,
241 lrp->lrp_access_perm);
246 int lustre_check_remote_perm(struct inode *inode, int mask)
248 struct ll_inode_info *lli = ll_i2info(inode);
249 struct ll_sb_info *sbi = ll_i2sbi(inode);
250 struct ptlrpc_request *req = NULL;
251 struct mdt_remote_perm *perm;
257 save = lli->lli_rmtperm_time;
258 rc = do_check_remote_perm(lli, mask);
259 if (!rc || (rc != -ENOENT && i))
264 mutex_lock(&lli->lli_rmtperm_mutex);
266 if (save != lli->lli_rmtperm_time) {
267 rc = do_check_remote_perm(lli, mask);
268 if (!rc || (rc != -ENOENT && i)) {
269 mutex_unlock(&lli->lli_rmtperm_mutex);
275 CERROR("check remote perm falls in dead loop!\n");
279 oc = ll_mdscapa_get(inode);
280 rc = md_get_remote_perm(sbi->ll_md_exp, ll_inode2fid(inode), oc,
281 ll_i2suppgid(inode), &req);
284 mutex_unlock(&lli->lli_rmtperm_mutex);
288 perm = req_capsule_server_swab_get(&req->rq_pill, &RMF_ACL,
289 lustre_swab_mdt_remote_perm);
290 if (unlikely(!perm)) {
291 mutex_unlock(&lli->lli_rmtperm_mutex);
296 rc = ll_update_remote_perm(inode, perm);
297 mutex_unlock(&lli->lli_rmtperm_mutex);
301 ptlrpc_req_finished(req);
304 ptlrpc_req_finished(req);
308 #if 0 /* NB: remote perms can't be freed in ll_mdc_blocking_ast of UPDATE lock,
309 * because it will fail sanity test 48.
311 void ll_free_remote_perms(struct inode *inode)
313 struct ll_inode_info *lli = ll_i2info(inode);
314 struct hlist_head *hash = lli->lli_remote_perms;
315 struct ll_remote_perm *lrp;
316 struct hlist_node *node, *next;
321 spin_lock(&lli->lli_lock);
323 for (i = 0; i < REMOTE_PERM_HASHSIZE; i++) {
324 hlist_for_each_entry_safe(lrp, node, next, hash + i, lrp_list)
325 free_ll_remote_perm(lrp);
328 spin_unlock(&lli->lli_lock);