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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>
42 # define EXPORT_SYMTAB
44 #define DEBUG_SUBSYSTEM S_MDS
46 #include <linux/module.h>
47 #include <lustre_ver.h>
48 #include "mdd_internal.h"
50 void mdd_write_lock(const struct lu_env *env, struct mdd_object *obj,
51 enum mdd_object_role role)
53 struct dt_object *next = mdd_object_child(obj);
55 next->do_ops->do_write_lock(env, next, role);
58 void mdd_read_lock(const struct lu_env *env, struct mdd_object *obj,
59 enum mdd_object_role role)
61 struct dt_object *next = mdd_object_child(obj);
63 next->do_ops->do_read_lock(env, next, role);
66 void mdd_write_unlock(const struct lu_env *env, struct mdd_object *obj)
68 struct dt_object *next = mdd_object_child(obj);
70 next->do_ops->do_write_unlock(env, next);
73 void mdd_read_unlock(const struct lu_env *env, struct mdd_object *obj)
75 struct dt_object *next = mdd_object_child(obj);
77 next->do_ops->do_read_unlock(env, next);
80 int mdd_write_locked(const struct lu_env *env, struct mdd_object *obj)
82 struct dt_object *next = mdd_object_child(obj);
84 return next->do_ops->do_write_locked(env, next);
87 unsigned long mdd_name2hash(const char *name)
89 return full_name_hash((unsigned char*)name, strlen(name));
92 /* Methods for parallel directory locking */
93 #if MDD_DISABLE_PDO_LOCK
95 static void *pdo_handle = (void *)0xbabecafe;
97 void mdd_pdlock_init(struct mdd_object *obj)
101 void *mdd_pdo_write_lock(const struct lu_env *env, struct mdd_object *obj,
102 const char *name, enum mdd_object_role role)
107 void *mdd_pdo_read_lock(const struct lu_env *env, struct mdd_object *obj,
108 const char *name, enum mdd_object_role role)
113 void mdd_pdo_write_unlock(const struct lu_env *env, struct mdd_object *obj,
116 LASSERT(dlh == pdo_handle);
119 void mdd_pdo_read_unlock(const struct lu_env *env, struct mdd_object *obj,
122 LASSERT(dlh == pdo_handle);
125 #else /* !MDD_DISABLE_PDO_LOCK */
127 #ifdef CONFIG_LOCKDEP
128 static cfs_lock_class_key_t mdd_pdirop_key;
130 #define RETIP ((unsigned long)__builtin_return_address(0))
132 static void mdd_lockdep_init(struct mdd_object *obj)
134 lockdep_set_class_and_name(obj, &mdd_pdirop_key, "pdir");
137 static void mdd_lockdep_pd_acquire(struct mdd_object *obj,
138 enum mdd_object_role role)
140 #ifdef HAVE_LOCK_MAP_ACQUIRE
141 lock_map_acquire(&obj->dep_map);
143 lock_acquire(&obj->dep_map, role, 0, 1, 2, RETIP);
147 static void mdd_lockdep_pd_release(struct mdd_object *obj)
149 #ifdef HAVE_LOCK_MAP_ACQUIRE
150 lock_map_release(&obj->dep_map);
152 lock_release(&obj->dep_map, 0, RETIP);
156 #else /* !CONFIG_LOCKDEP */
158 static void mdd_lockdep_init(struct mdd_object *obj)
160 static void mdd_lockdep_pd_acquire(struct mdd_object *obj,
161 enum mdd_object_role role)
163 static void mdd_lockdep_pd_release(struct mdd_object *obj)
166 #endif /* !CONFIG_LOCKDEP */
168 void mdd_pdlock_init(struct mdd_object *obj)
170 dynlock_init(&obj->mod_pdlock);
171 mdd_lockdep_init(obj);
174 void *mdd_pdo_write_lock(const struct lu_env *env, struct mdd_object *obj,
175 const char *name, enum mdd_object_role role)
177 struct dynlock_handle *handle;
178 unsigned long value = mdd_name2hash(name);
180 handle = dynlock_lock(&obj->mod_pdlock, value, DLT_WRITE, GFP_NOFS);
182 mdd_lockdep_pd_acquire(obj, role);
186 void *mdd_pdo_read_lock(const struct lu_env *env, struct mdd_object *obj,
187 const char *name, enum mdd_object_role role)
189 struct dynlock_handle *handle;
190 unsigned long value = mdd_name2hash(name);
191 handle = dynlock_lock(&obj->mod_pdlock, value, DLT_READ, GFP_NOFS);
193 mdd_lockdep_pd_acquire(obj, role);
197 void mdd_pdo_write_unlock(const struct lu_env *env, struct mdd_object *obj,
200 mdd_lockdep_pd_release(obj);
201 return dynlock_unlock(&obj->mod_pdlock, dlh);
204 void mdd_pdo_read_unlock(const struct lu_env *env, struct mdd_object *obj,
207 mdd_lockdep_pd_release(obj);
208 return dynlock_unlock(&obj->mod_pdlock, dlh);
211 #endif /* MDD_DISABLE_PDO_LOCK */