--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
+ * vim:expandtab:shiftwidth=8:tabstop=8:
+ *
+ * lustre/llite/llite_rmtacl.c
+ * Lustre Remote User Access Control List.
+ * Author: Fan Yong <fanyong@clusterfs.com>
+ *
+ * Copyright (c) 2004-2007 Cluster File Systems, Inc.
+ *
+ * This file is part of Lustre, http://www.lustre.org.
+ *
+ * Lustre is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * Lustre 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 for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Lustre; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#define DEBUG_SUBSYSTEM S_LLITE
+
+#ifdef CONFIG_FS_POSIX_ACL
+
+#include <lustre_lite.h>
+#include "llite_internal.h"
+
+static inline __u32 rce_hashfunc(uid_t id)
+{
+ return id & (RCE_HASHES - 1);
+}
+
+static inline __u32 ee_hashfunc(uid_t id)
+{
+ return id & (EE_HASHES - 1);
+}
+
+obd_valid rce_ops2valid(int ops)
+{
+ switch (ops) {
+ case RMT_LSETFACL:
+ return OBD_MD_FLRMTLSETFACL;
+ case RMT_LGETFACL:
+ return OBD_MD_FLRMTLGETFACL;
+ case RMT_RSETFACL:
+ return OBD_MD_FLRMTRSETFACL;
+ case RMT_RGETFACL:
+ return OBD_MD_FLRMTRGETFACL;
+ default:
+ return 0;
+ }
+}
+
+static struct rmtacl_ctl_entry *rce_alloc(pid_t key, int ops)
+{
+ struct rmtacl_ctl_entry *rce;
+
+ OBD_ALLOC_PTR(rce);
+ if (!rce)
+ return NULL;
+
+ CFS_INIT_LIST_HEAD(&rce->rce_list);
+ rce->rce_key = key;
+ rce->rce_ops = ops;
+
+ return rce;
+}
+
+static void rce_free(struct rmtacl_ctl_entry *rce)
+{
+ if (!list_empty(&rce->rce_list))
+ list_del(&rce->rce_list);
+
+ OBD_FREE_PTR(rce);
+}
+
+static struct rmtacl_ctl_entry *__rct_search(struct rmtacl_ctl_table *rct,
+ pid_t key)
+{
+ struct rmtacl_ctl_entry *rce;
+ struct list_head *head = &rct->rct_entries[rce_hashfunc(key)];
+
+ list_for_each_entry(rce, head, rce_list)
+ if (rce->rce_key == key)
+ return rce;
+
+ return NULL;
+}
+
+struct rmtacl_ctl_entry *rct_search(struct rmtacl_ctl_table *rct, pid_t key)
+{
+ struct rmtacl_ctl_entry *rce;
+
+ spin_lock(&rct->rct_lock);
+ rce = __rct_search(rct, key);
+ spin_unlock(&rct->rct_lock);
+ return rce;
+}
+
+int rct_add(struct rmtacl_ctl_table *rct, pid_t key, int ops)
+{
+ struct rmtacl_ctl_entry *rce, *e;
+
+ rce = rce_alloc(key, ops);
+ if (rce == NULL)
+ return -ENOMEM;
+
+ spin_lock(&rct->rct_lock);
+ e = __rct_search(rct, key);
+ if (unlikely(e != NULL)) {
+ CWARN("Unexpected stale rmtacl_entry found: "
+ "[key: %d] [ops: %d]\n", (int)key, ops);
+ rce_free(e);
+ }
+ list_add_tail(&rce->rce_list, &rct->rct_entries[rce_hashfunc(key)]);
+ spin_unlock(&rct->rct_lock);
+
+ return 0;
+}
+
+int rct_del(struct rmtacl_ctl_table *rct, pid_t key)
+{
+ struct rmtacl_ctl_entry *rce;
+
+ spin_lock(&rct->rct_lock);
+ rce = __rct_search(rct, key);
+ if (rce)
+ rce_free(rce);
+ spin_unlock(&rct->rct_lock);
+
+ return rce ? 0 : -ENOENT;
+}
+
+void rct_init(struct rmtacl_ctl_table *rct)
+{
+ int i;
+
+ spin_lock_init(&rct->rct_lock);
+ for (i = 0; i < RCE_HASHES; i++)
+ CFS_INIT_LIST_HEAD(&rct->rct_entries[i]);
+}
+
+void rct_fini(struct rmtacl_ctl_table *rct)
+{
+ struct rmtacl_ctl_entry *rce;
+ int i;
+
+ spin_lock(&rct->rct_lock);
+ for (i = 0; i < RCE_HASHES; i++)
+ while (!list_empty(&rct->rct_entries[i])) {
+ rce = list_entry(rct->rct_entries[i].next,
+ struct rmtacl_ctl_entry, rce_list);
+ rce_free(rce);
+ }
+ spin_unlock(&rct->rct_lock);
+}
+
+
+static struct eacl_entry *ee_alloc(pid_t key, struct lu_fid *fid, int type,
+ ext_acl_xattr_header *header)
+{
+ struct eacl_entry *ee;
+
+ OBD_ALLOC_PTR(ee);
+ if (!ee)
+ return NULL;
+
+ CFS_INIT_LIST_HEAD(&ee->ee_list);
+ ee->ee_key = key;
+ ee->ee_fid = *fid;
+ ee->ee_type = type;
+ ee->ee_acl = header;
+
+ return ee;
+}
+
+void ee_free(struct eacl_entry *ee)
+{
+ if (!list_empty(&ee->ee_list))
+ list_del(&ee->ee_list);
+
+ if (ee->ee_acl)
+ lustre_ext_acl_xattr_free(ee->ee_acl);
+
+ OBD_FREE_PTR(ee);
+}
+
+static struct eacl_entry *__et_search_del(struct eacl_table *et, pid_t key,
+ struct lu_fid *fid, int type)
+{
+ struct eacl_entry *ee;
+ struct list_head *head = &et->et_entries[ee_hashfunc(key)];
+
+ LASSERT(fid != NULL);
+ list_for_each_entry(ee, head, ee_list)
+ if (ee->ee_key == key) {
+ if (lu_fid_eq(&ee->ee_fid, fid) &&
+ ee->ee_type == type) {
+ list_del_init(&ee->ee_list);
+ return ee;
+ }
+ }
+
+ return NULL;
+}
+
+struct eacl_entry *et_search_del(struct eacl_table *et, pid_t key,
+ struct lu_fid *fid, int type)
+{
+ struct eacl_entry *ee;
+
+ spin_lock(&et->et_lock);
+ ee = __et_search_del(et, key, fid, type);
+ spin_unlock(&et->et_lock);
+ return ee;
+}
+
+void et_search_free(struct eacl_table *et, pid_t key)
+{
+ struct eacl_entry *ee, *next;
+ struct list_head *head = &et->et_entries[ee_hashfunc(key)];
+
+ spin_lock(&et->et_lock);
+ list_for_each_entry_safe(ee, next, head, ee_list)
+ if (ee->ee_key == key)
+ ee_free(ee);
+
+ spin_unlock(&et->et_lock);
+}
+
+int ee_add(struct eacl_table *et, pid_t key, struct lu_fid *fid, int type,
+ ext_acl_xattr_header *header)
+{
+ struct eacl_entry *ee, *e;
+
+ ee = ee_alloc(key, fid, type, header);
+ if (ee == NULL)
+ return -ENOMEM;
+
+ spin_lock(&et->et_lock);
+ e = __et_search_del(et, key, fid, type);
+ if (unlikely(e != NULL)) {
+ CWARN("Unexpected stale eacl_entry found: "
+ "[key: %d] [fid: "DFID"] [type: %d]\n",
+ (int)key, PFID(fid), type);
+ ee_free(e);
+ }
+ list_add_tail(&ee->ee_list, &et->et_entries[ee_hashfunc(key)]);
+ spin_unlock(&et->et_lock);
+
+ return 0;
+}
+
+void et_init(struct eacl_table *et)
+{
+ int i;
+
+ spin_lock_init(&et->et_lock);
+ for (i = 0; i < EE_HASHES; i++)
+ CFS_INIT_LIST_HEAD(&et->et_entries[i]);
+}
+
+void et_fini(struct eacl_table *et)
+{
+ struct eacl_entry *ee;
+ int i;
+
+ spin_lock(&et->et_lock);
+ for (i = 0; i < EE_HASHES; i++)
+ while (!list_empty(&et->et_entries[i])) {
+ ee = list_entry(et->et_entries[i].next,
+ struct eacl_entry, ee_list);
+ ee_free(ee);
+ }
+ spin_unlock(&et->et_lock);
+}
+
+#endif
git://git.whamcloud.com / fs / lustre-release.git / blobdiff