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11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
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17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
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21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
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30 * Copyright (c) 2012, Intel Corporation.
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>
43 #define DEBUG_SUBSYSTEM S_MDS
45 #include <linux/module.h>
46 #include <lustre_ver.h>
47 #include "mdd_internal.h"
49 void mdd_write_lock(const struct lu_env *env, struct mdd_object *obj,
50 enum mdd_object_role role)
52 struct dt_object *next = mdd_object_child(obj);
54 next->do_ops->do_write_lock(env, next, role);
57 void mdd_read_lock(const struct lu_env *env, struct mdd_object *obj,
58 enum mdd_object_role role)
60 struct dt_object *next = mdd_object_child(obj);
62 next->do_ops->do_read_lock(env, next, role);
65 void mdd_write_unlock(const struct lu_env *env, struct mdd_object *obj)
67 struct dt_object *next = mdd_object_child(obj);
69 next->do_ops->do_write_unlock(env, next);
72 void mdd_read_unlock(const struct lu_env *env, struct mdd_object *obj)
74 struct dt_object *next = mdd_object_child(obj);
76 next->do_ops->do_read_unlock(env, next);
79 int mdd_write_locked(const struct lu_env *env, struct mdd_object *obj)
81 struct dt_object *next = mdd_object_child(obj);
83 return next->do_ops->do_write_locked(env, next);
86 unsigned long mdd_name2hash(const char *name)
88 return full_name_hash((unsigned char*)name, strlen(name));
91 /* Methods for parallel directory locking */
92 #if MDD_DISABLE_PDO_LOCK
94 static void *pdo_handle = (void *)0xbabecafe;
96 void mdd_pdlock_init(struct mdd_object *obj)
100 void *mdd_pdo_write_lock(const struct lu_env *env, struct mdd_object *obj,
101 const char *name, enum mdd_object_role role)
106 void *mdd_pdo_read_lock(const struct lu_env *env, struct mdd_object *obj,
107 const char *name, enum mdd_object_role role)
112 void mdd_pdo_write_unlock(const struct lu_env *env, struct mdd_object *obj,
115 LASSERT(dlh == pdo_handle);
118 void mdd_pdo_read_unlock(const struct lu_env *env, struct mdd_object *obj,
121 LASSERT(dlh == pdo_handle);
124 #else /* !MDD_DISABLE_PDO_LOCK */
126 #ifdef CONFIG_LOCKDEP
127 static struct lock_class_key mdd_pdirop_key;
129 #define RETIP ((unsigned long)__builtin_return_address(0))
131 static void mdd_lockdep_init(struct mdd_object *obj)
133 lockdep_set_class_and_name(obj, &mdd_pdirop_key, "pdir");
136 static void mdd_lockdep_pd_acquire(struct mdd_object *obj,
137 enum mdd_object_role role)
139 #ifdef HAVE_LOCK_MAP_ACQUIRE
140 lock_map_acquire(&obj->dep_map);
142 lock_acquire(&obj->dep_map, role, 0, 1, 2, RETIP);
146 static void mdd_lockdep_pd_release(struct mdd_object *obj)
148 #ifdef HAVE_LOCK_MAP_ACQUIRE
149 lock_map_release(&obj->dep_map);
151 lock_release(&obj->dep_map, 0, RETIP);
155 #else /* !CONFIG_LOCKDEP */
157 static void mdd_lockdep_init(struct mdd_object *obj)
159 static void mdd_lockdep_pd_acquire(struct mdd_object *obj,
160 enum mdd_object_role role)
162 static void mdd_lockdep_pd_release(struct mdd_object *obj)
165 #endif /* !CONFIG_LOCKDEP */
167 void mdd_pdlock_init(struct mdd_object *obj)
169 dynlock_init(&obj->mod_pdlock);
170 mdd_lockdep_init(obj);
173 void *mdd_pdo_write_lock(const struct lu_env *env, struct mdd_object *obj,
174 const char *name, enum mdd_object_role role)
176 struct dynlock_handle *handle;
177 unsigned long value = mdd_name2hash(name);
179 handle = dynlock_lock(&obj->mod_pdlock, value, DLT_WRITE, GFP_NOFS);
181 mdd_lockdep_pd_acquire(obj, role);
185 void *mdd_pdo_read_lock(const struct lu_env *env, struct mdd_object *obj,
186 const char *name, enum mdd_object_role role)
188 struct dynlock_handle *handle;
189 unsigned long value = mdd_name2hash(name);
190 handle = dynlock_lock(&obj->mod_pdlock, value, DLT_READ, GFP_NOFS);
192 mdd_lockdep_pd_acquire(obj, role);
196 void mdd_pdo_write_unlock(const struct lu_env *env, struct mdd_object *obj,
199 mdd_lockdep_pd_release(obj);
200 return dynlock_unlock(&obj->mod_pdlock, dlh);
203 void mdd_pdo_read_unlock(const struct lu_env *env, struct mdd_object *obj,
206 mdd_lockdep_pd_release(obj);
207 return dynlock_unlock(&obj->mod_pdlock, dlh);
210 #endif /* MDD_DISABLE_PDO_LOCK */