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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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34 * lustre/mdd/mdd_lock.c
36 * Lustre Metadata Server (mdd) routines
38 * Author: Mike Pershin <tappro@clusterfs.com>
41 #define DEBUG_SUBSYSTEM S_MDS
43 #include <linux/module.h>
44 #include <lustre_ver.h>
45 #include "mdd_internal.h"
47 void mdd_write_lock(const struct lu_env *env, struct mdd_object *obj,
48 enum mdd_object_role role)
50 struct dt_object *next = mdd_object_child(obj);
52 next->do_ops->do_write_lock(env, next, role);
55 void mdd_read_lock(const struct lu_env *env, struct mdd_object *obj,
56 enum mdd_object_role role)
58 struct dt_object *next = mdd_object_child(obj);
60 next->do_ops->do_read_lock(env, next, role);
63 void mdd_write_unlock(const struct lu_env *env, struct mdd_object *obj)
65 struct dt_object *next = mdd_object_child(obj);
67 next->do_ops->do_write_unlock(env, next);
70 void mdd_read_unlock(const struct lu_env *env, struct mdd_object *obj)
72 struct dt_object *next = mdd_object_child(obj);
74 next->do_ops->do_read_unlock(env, next);
77 int mdd_write_locked(const struct lu_env *env, struct mdd_object *obj)
79 struct dt_object *next = mdd_object_child(obj);
81 return next->do_ops->do_write_locked(env, next);
84 unsigned long mdd_name2hash(const char *name)
86 return full_name_hash((unsigned char*)name, strlen(name));
89 /* Methods for parallel directory locking */
90 #if MDD_DISABLE_PDO_LOCK
92 static void *pdo_handle = (void *)0xbabecafe;
94 void mdd_pdlock_init(struct mdd_object *obj)
98 void *mdd_pdo_write_lock(const struct lu_env *env, struct mdd_object *obj,
99 const char *name, enum mdd_object_role role)
104 void *mdd_pdo_read_lock(const struct lu_env *env, struct mdd_object *obj,
105 const char *name, enum mdd_object_role role)
110 void mdd_pdo_write_unlock(const struct lu_env *env, struct mdd_object *obj,
113 LASSERT(dlh == pdo_handle);
116 void mdd_pdo_read_unlock(const struct lu_env *env, struct mdd_object *obj,
119 LASSERT(dlh == pdo_handle);
122 #else /* !MDD_DISABLE_PDO_LOCK */
124 #ifdef CONFIG_LOCKDEP
125 static struct lock_class_key mdd_pdirop_key;
127 #define RETIP ((unsigned long)__builtin_return_address(0))
129 static void mdd_lockdep_init(struct mdd_object *obj)
131 lockdep_set_class_and_name(obj, &mdd_pdirop_key, "pdir");
134 static void mdd_lockdep_pd_acquire(struct mdd_object *obj,
135 enum mdd_object_role role)
137 #ifdef HAVE_LOCK_MAP_ACQUIRE
138 lock_map_acquire(&obj->dep_map);
140 lock_acquire(&obj->dep_map, role, 0, 1, 2, RETIP);
144 static void mdd_lockdep_pd_release(struct mdd_object *obj)
146 #ifdef HAVE_LOCK_MAP_ACQUIRE
147 lock_map_release(&obj->dep_map);
149 lock_release(&obj->dep_map, 0, RETIP);
153 #else /* !CONFIG_LOCKDEP */
155 static void mdd_lockdep_init(struct mdd_object *obj)
157 static void mdd_lockdep_pd_acquire(struct mdd_object *obj,
158 enum mdd_object_role role)
160 static void mdd_lockdep_pd_release(struct mdd_object *obj)
163 #endif /* !CONFIG_LOCKDEP */
165 void mdd_pdlock_init(struct mdd_object *obj)
167 dynlock_init(&obj->mod_pdlock);
168 mdd_lockdep_init(obj);
171 void *mdd_pdo_write_lock(const struct lu_env *env, struct mdd_object *obj,
172 const char *name, enum mdd_object_role role)
174 struct dynlock_handle *handle;
175 unsigned long value = mdd_name2hash(name);
177 handle = dynlock_lock(&obj->mod_pdlock, value, DLT_WRITE, GFP_NOFS);
179 mdd_lockdep_pd_acquire(obj, role);
183 void *mdd_pdo_read_lock(const struct lu_env *env, struct mdd_object *obj,
184 const char *name, enum mdd_object_role role)
186 struct dynlock_handle *handle;
187 unsigned long value = mdd_name2hash(name);
188 handle = dynlock_lock(&obj->mod_pdlock, value, DLT_READ, GFP_NOFS);
190 mdd_lockdep_pd_acquire(obj, role);
194 void mdd_pdo_write_unlock(const struct lu_env *env, struct mdd_object *obj,
197 mdd_lockdep_pd_release(obj);
198 return dynlock_unlock(&obj->mod_pdlock, dlh);
201 void mdd_pdo_read_unlock(const struct lu_env *env, struct mdd_object *obj,
204 mdd_lockdep_pd_release(obj);
205 return dynlock_unlock(&obj->mod_pdlock, dlh);
208 #endif /* MDD_DISABLE_PDO_LOCK */