1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/mdd/mdd_lock.c
38 * Lustre Metadata Server (mdd) routines
40 * Author: Mike Pershin <tappro@clusterfs.com>
44 # define EXPORT_SYMTAB
46 #define DEBUG_SUBSYSTEM S_MDS
48 #include <linux/module.h>
49 #include <lustre_ver.h>
50 #include "mdd_internal.h"
52 void mdd_write_lock(const struct lu_env *env, struct mdd_object *obj,
53 enum mdd_object_role role)
55 struct dt_object *next = mdd_object_child(obj);
57 next->do_ops->do_write_lock(env, next, role);
60 void mdd_read_lock(const struct lu_env *env, struct mdd_object *obj,
61 enum mdd_object_role role)
63 struct dt_object *next = mdd_object_child(obj);
65 next->do_ops->do_read_lock(env, next, role);
68 void mdd_write_unlock(const struct lu_env *env, struct mdd_object *obj)
70 struct dt_object *next = mdd_object_child(obj);
72 next->do_ops->do_write_unlock(env, next);
75 void mdd_read_unlock(const struct lu_env *env, struct mdd_object *obj)
77 struct dt_object *next = mdd_object_child(obj);
79 next->do_ops->do_read_unlock(env, next);
82 int mdd_write_locked(const struct lu_env *env, struct mdd_object *obj)
84 struct dt_object *next = mdd_object_child(obj);
86 return next->do_ops->do_write_locked(env, next);
89 unsigned long mdd_name2hash(const char *name)
91 return full_name_hash((unsigned char*)name, strlen(name));
94 /* Methods for parallel directory locking */
95 #if MDD_DISABLE_PDO_LOCK
97 static void *pdo_handle = (void *)0xbabecafe;
99 void mdd_pdlock_init(struct mdd_object *obj)
103 void *mdd_pdo_write_lock(const struct lu_env *env, struct mdd_object *obj,
104 const char *name, enum mdd_object_role role)
109 void *mdd_pdo_read_lock(const struct lu_env *env, struct mdd_object *obj,
110 const char *name, enum mdd_object_role role)
115 void mdd_pdo_write_unlock(const struct lu_env *env, struct mdd_object *obj,
118 LASSERT(dlh == pdo_handle);
121 void mdd_pdo_read_unlock(const struct lu_env *env, struct mdd_object *obj,
124 LASSERT(dlh == pdo_handle);
127 #else /* !MDD_DISABLE_PDO_LOCK */
129 #ifdef CONFIG_LOCKDEP
130 static cfs_lock_class_key_t mdd_pdirop_key;
132 #define RETIP ((unsigned long)__builtin_return_address(0))
134 static void mdd_lockdep_init(struct mdd_object *obj)
136 lockdep_set_class_and_name(obj, &mdd_pdirop_key, "pdir");
139 static void mdd_lockdep_pd_acquire(struct mdd_object *obj,
140 enum mdd_object_role role)
142 #ifdef HAVE_LOCK_MAP_ACQUIRE
143 lock_map_acquire(&obj->dep_map);
145 lock_acquire(&obj->dep_map, role, 0, 1, 2, RETIP);
149 static void mdd_lockdep_pd_release(struct mdd_object *obj)
151 #ifdef HAVE_LOCK_MAP_ACQUIRE
152 lock_map_release(&obj->dep_map);
154 lock_release(&obj->dep_map, 0, RETIP);
158 #else /* !CONFIG_LOCKDEP */
160 static void mdd_lockdep_init(struct mdd_object *obj)
162 static void mdd_lockdep_pd_acquire(struct mdd_object *obj,
163 enum mdd_object_role role)
165 static void mdd_lockdep_pd_release(struct mdd_object *obj)
168 #endif /* !CONFIG_LOCKDEP */
170 void mdd_pdlock_init(struct mdd_object *obj)
172 dynlock_init(&obj->mod_pdlock);
173 mdd_lockdep_init(obj);
176 void *mdd_pdo_write_lock(const struct lu_env *env, struct mdd_object *obj,
177 const char *name, enum mdd_object_role role)
179 struct dynlock_handle *handle;
180 unsigned long value = mdd_name2hash(name);
182 handle = dynlock_lock(&obj->mod_pdlock, value, DLT_WRITE, GFP_NOFS);
184 mdd_lockdep_pd_acquire(obj, role);
188 void *mdd_pdo_read_lock(const struct lu_env *env, struct mdd_object *obj,
189 const char *name, enum mdd_object_role role)
191 struct dynlock_handle *handle;
192 unsigned long value = mdd_name2hash(name);
193 handle = dynlock_lock(&obj->mod_pdlock, value, DLT_READ, GFP_NOFS);
195 mdd_lockdep_pd_acquire(obj, role);
199 void mdd_pdo_write_unlock(const struct lu_env *env, struct mdd_object *obj,
202 mdd_lockdep_pd_release(obj);
203 return dynlock_unlock(&obj->mod_pdlock, dlh);
206 void mdd_pdo_read_unlock(const struct lu_env *env, struct mdd_object *obj,
209 mdd_lockdep_pd_release(obj);
210 return dynlock_unlock(&obj->mod_pdlock, dlh);
213 #endif /* MDD_DISABLE_PDO_LOCK */