--- /dev/null
+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2011, 2012, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * lustre/llite/remote_perm.c
+ *
+ * Lustre Permission Cache for Remote Client
+ *
+ * Author: Lai Siyao <lsy@clusterfs.com>
+ * Author: Fan Yong <fanyong@clusterfs.com>
+ */
+
+#define DEBUG_SUBSYSTEM S_LLITE
+
+#include <linux/module.h>
+#include <linux/types.h>
+
+#include "../include/lustre_lite.h"
+#include "../include/lustre_ha.h"
+#include "../include/lustre_dlm.h"
+#include "../include/lprocfs_status.h"
+#include "../include/lustre_disk.h"
+#include "../include/lustre_param.h"
+#include "llite_internal.h"
+
+struct kmem_cache *ll_remote_perm_cachep = NULL;
+struct kmem_cache *ll_rmtperm_hash_cachep = NULL;
+
+static inline struct ll_remote_perm *alloc_ll_remote_perm(void)
+{
+ struct ll_remote_perm *lrp;
+
+ OBD_SLAB_ALLOC_PTR_GFP(lrp, ll_remote_perm_cachep, GFP_KERNEL);
+ if (lrp)
+ INIT_HLIST_NODE(&lrp->lrp_list);
+ return lrp;
+}
+
+static inline void free_ll_remote_perm(struct ll_remote_perm *lrp)
+{
+ if (!lrp)
+ return;
+
+ if (!hlist_unhashed(&lrp->lrp_list))
+ hlist_del(&lrp->lrp_list);
+ OBD_SLAB_FREE(lrp, ll_remote_perm_cachep, sizeof(*lrp));
+}
+
+static struct hlist_head *alloc_rmtperm_hash(void)
+{
+ struct hlist_head *hash;
+ int i;
+
+ OBD_SLAB_ALLOC_GFP(hash, ll_rmtperm_hash_cachep,
+ REMOTE_PERM_HASHSIZE * sizeof(*hash),
+ GFP_IOFS);
+ if (!hash)
+ return NULL;
+
+ for (i = 0; i < REMOTE_PERM_HASHSIZE; i++)
+ INIT_HLIST_HEAD(hash + i);
+
+ return hash;
+}
+
+void free_rmtperm_hash(struct hlist_head *hash)
+{
+ int i;
+ struct ll_remote_perm *lrp;
+ struct hlist_node *next;
+
+ if (!hash)
+ return;
+
+ for (i = 0; i < REMOTE_PERM_HASHSIZE; i++)
+ hlist_for_each_entry_safe(lrp, next, hash + i,
+ lrp_list)
+ free_ll_remote_perm(lrp);
+ OBD_SLAB_FREE(hash, ll_rmtperm_hash_cachep,
+ REMOTE_PERM_HASHSIZE * sizeof(*hash));
+}
+
+static inline int remote_perm_hashfunc(uid_t uid)
+{
+ return uid & (REMOTE_PERM_HASHSIZE - 1);
+}
+
+/* NB: setxid permission is not checked here, instead it's done on
+ * MDT when client get remote permission. */
+static int do_check_remote_perm(struct ll_inode_info *lli, int mask)
+{
+ struct hlist_head *head;
+ struct ll_remote_perm *lrp;
+ int found = 0, rc;
+
+ if (!lli->lli_remote_perms)
+ return -ENOENT;
+
+ head = lli->lli_remote_perms +
+ remote_perm_hashfunc(from_kuid(&init_user_ns, current_uid()));
+
+ spin_lock(&lli->lli_lock);
+ hlist_for_each_entry(lrp, head, lrp_list) {
+ if (lrp->lrp_uid != from_kuid(&init_user_ns, current_uid()))
+ continue;
+ if (lrp->lrp_gid != from_kgid(&init_user_ns, current_gid()))
+ continue;
+ if (lrp->lrp_fsuid != from_kuid(&init_user_ns, current_fsuid()))
+ continue;
+ if (lrp->lrp_fsgid != from_kgid(&init_user_ns, current_fsgid()))
+ continue;
+ found = 1;
+ break;
+ }
+
+ if (!found) {
+ rc = -ENOENT;
+ goto out;
+ }
+
+ CDEBUG(D_SEC, "found remote perm: %u/%u/%u/%u - %#x\n",
+ lrp->lrp_uid, lrp->lrp_gid, lrp->lrp_fsuid, lrp->lrp_fsgid,
+ lrp->lrp_access_perm);
+ rc = ((lrp->lrp_access_perm & mask) == mask) ? 0 : -EACCES;
+
+out:
+ spin_unlock(&lli->lli_lock);
+ return rc;
+}
+
+int ll_update_remote_perm(struct inode *inode, struct mdt_remote_perm *perm)
+{
+ struct ll_inode_info *lli = ll_i2info(inode);
+ struct ll_remote_perm *lrp = NULL, *tmp = NULL;
+ struct hlist_head *head, *perm_hash = NULL;
+
+ LASSERT(ll_i2sbi(inode)->ll_flags & LL_SBI_RMT_CLIENT);
+
+#if 0
+ if (perm->rp_uid != current->uid ||
+ perm->rp_gid != current->gid ||
+ perm->rp_fsuid != current->fsuid ||
+ perm->rp_fsgid != current->fsgid) {
+ /* user might setxid in this small period */
+ CDEBUG(D_SEC,
+ "remote perm user %u/%u/%u/%u != current %u/%u/%u/%u\n",
+ perm->rp_uid, perm->rp_gid, perm->rp_fsuid,
+ perm->rp_fsgid, current->uid, current->gid,
+ current->fsuid, current->fsgid);
+ return -EAGAIN;
+ }
+#endif
+
+ if (!lli->lli_remote_perms) {
+ perm_hash = alloc_rmtperm_hash();
+ if (perm_hash == NULL) {
+ CERROR("alloc lli_remote_perms failed!\n");
+ return -ENOMEM;
+ }
+ }
+
+ spin_lock(&lli->lli_lock);
+
+ if (!lli->lli_remote_perms)
+ lli->lli_remote_perms = perm_hash;
+ else
+ free_rmtperm_hash(perm_hash);
+
+ head = lli->lli_remote_perms + remote_perm_hashfunc(perm->rp_uid);
+
+again:
+ hlist_for_each_entry(tmp, head, lrp_list) {
+ if (tmp->lrp_uid != perm->rp_uid)
+ continue;
+ if (tmp->lrp_gid != perm->rp_gid)
+ continue;
+ if (tmp->lrp_fsuid != perm->rp_fsuid)
+ continue;
+ if (tmp->lrp_fsgid != perm->rp_fsgid)
+ continue;
+ free_ll_remote_perm(lrp);
+ lrp = tmp;
+ break;
+ }
+
+ if (!lrp) {
+ spin_unlock(&lli->lli_lock);
+ lrp = alloc_ll_remote_perm();
+ if (!lrp) {
+ CERROR("alloc memory for ll_remote_perm failed!\n");
+ return -ENOMEM;
+ }
+ spin_lock(&lli->lli_lock);
+ goto again;
+ }
+
+ lrp->lrp_access_perm = perm->rp_access_perm;
+ if (lrp != tmp) {
+ lrp->lrp_uid = perm->rp_uid;
+ lrp->lrp_gid = perm->rp_gid;
+ lrp->lrp_fsuid = perm->rp_fsuid;
+ lrp->lrp_fsgid = perm->rp_fsgid;
+ hlist_add_head(&lrp->lrp_list, head);
+ }
+ lli->lli_rmtperm_time = cfs_time_current();
+ spin_unlock(&lli->lli_lock);
+
+ CDEBUG(D_SEC, "new remote perm@%p: %u/%u/%u/%u - %#x\n",
+ lrp, lrp->lrp_uid, lrp->lrp_gid, lrp->lrp_fsuid, lrp->lrp_fsgid,
+ lrp->lrp_access_perm);
+
+ return 0;
+}
+
+int lustre_check_remote_perm(struct inode *inode, int mask)
+{
+ struct ll_inode_info *lli = ll_i2info(inode);
+ struct ll_sb_info *sbi = ll_i2sbi(inode);
+ struct ptlrpc_request *req = NULL;
+ struct mdt_remote_perm *perm;
+ struct obd_capa *oc;
+ unsigned long save;
+ int i = 0, rc;
+
+ do {
+ save = lli->lli_rmtperm_time;
+ rc = do_check_remote_perm(lli, mask);
+ if (!rc || (rc != -ENOENT && i))
+ break;
+
+ might_sleep();
+
+ mutex_lock(&lli->lli_rmtperm_mutex);
+ /* check again */
+ if (save != lli->lli_rmtperm_time) {
+ rc = do_check_remote_perm(lli, mask);
+ if (!rc || (rc != -ENOENT && i)) {
+ mutex_unlock(&lli->lli_rmtperm_mutex);
+ break;
+ }
+ }
+
+ if (i++ > 5) {
+ CERROR("check remote perm falls in dead loop!\n");
+ LBUG();
+ }
+
+ oc = ll_mdscapa_get(inode);
+ rc = md_get_remote_perm(sbi->ll_md_exp, ll_inode2fid(inode), oc,
+ ll_i2suppgid(inode), &req);
+ capa_put(oc);
+ if (rc) {
+ mutex_unlock(&lli->lli_rmtperm_mutex);
+ break;
+ }
+
+ perm = req_capsule_server_swab_get(&req->rq_pill, &RMF_ACL,
+ lustre_swab_mdt_remote_perm);
+ if (unlikely(perm == NULL)) {
+ mutex_unlock(&lli->lli_rmtperm_mutex);
+ rc = -EPROTO;
+ break;
+ }
+
+ rc = ll_update_remote_perm(inode, perm);
+ mutex_unlock(&lli->lli_rmtperm_mutex);
+ if (rc == -ENOMEM)
+ break;
+
+ ptlrpc_req_finished(req);
+ req = NULL;
+ } while (1);
+ ptlrpc_req_finished(req);
+ return rc;
+}
+
+#if 0 /* NB: remote perms can't be freed in ll_mdc_blocking_ast of UPDATE lock,
+ * because it will fail sanity test 48.
+ */
+void ll_free_remote_perms(struct inode *inode)
+{
+ struct ll_inode_info *lli = ll_i2info(inode);
+ struct hlist_head *hash = lli->lli_remote_perms;
+ struct ll_remote_perm *lrp;
+ struct hlist_node *node, *next;
+ int i;
+
+ LASSERT(hash);
+
+ spin_lock(&lli->lli_lock);
+
+ for (i = 0; i < REMOTE_PERM_HASHSIZE; i++) {
+ hlist_for_each_entry_safe(lrp, node, next, hash + i,
+ lrp_list)
+ free_ll_remote_perm(lrp);
+ }
+
+ spin_unlock(&lli->lli_lock);
+}
+#endif
Code Review / kvmfornfv.git / blobdiff