1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
5 #ifndef _LUSTRE_DLM_H__
6 #define _LUSTRE_DLM_H__
8 #include <linux/kp30.h>
9 #include <linux/list.h>
11 #include <linux/obd_class.h>
15 #define OBD_LDLM_DEVICENAME "ldlm"
17 typedef int cluster_host;
18 typedef int cluster_pid;
22 ELDLM_BLOCK_GRANTED = 600,
29 #define LDLM_FL_RES_CHANGED (1 << 0)
30 #define LDLM_FL_COMPLETION_AST (1 << 1)
31 #define LDLM_FL_BLOCKING_AST (1 << 2)
33 #define L2B(c) (1 << c)
35 /* compatibility matrix */
36 #define LCK_COMPAT_EX L2B(LCK_NL)
37 #define LCK_COMPAT_PW (LCK_COMPAT_EX | L2B(LCK_CR))
38 #define LCK_COMPAT_PR (LCK_COMPAT_PW | L2B(LCK_PR))
39 #define LCK_COMPAT_CW (LCK_COMPAT_PW | L2B(LCK_CW))
40 #define LCK_COMPAT_CR (LCK_COMPAT_CW | L2B(LCK_PR) | L2B(LCK_PW))
41 #define LCK_COMPAT_NL (LCK_COMPAT_CR | L2B(LCK_EX))
43 static ldlm_mode_t lck_compat_array[] = {
44 [LCK_EX] LCK_COMPAT_EX,
45 [LCK_PW] LCK_COMPAT_PW,
46 [LCK_PR] LCK_COMPAT_PR,
47 [LCK_CW] LCK_COMPAT_CW,
48 [LCK_CR] LCK_COMPAT_CR,
49 [LCK_NL] LCK_COMPAT_NL
52 static inline int lockmode_compat(ldlm_mode_t exist, ldlm_mode_t new)
54 if (exist < LCK_EX || exist > LCK_NL)
56 if (new < LCK_EX || new > LCK_NL)
59 return (lck_compat_array[exist] & L2B(new));
68 #define DLM_OST_NAMESPACE 1
69 #define DLM_MDS_NAMESPACE 2
72 - do we just separate this by security domains and use a prefix for
73 multiple namespaces in the same domain?
77 struct ldlm_namespace {
78 struct list_head ns_link; /* in the list of ns's */
79 __u32 ns_id; /* identifier of ns */
80 struct list_head *ns_hash; /* hash table for ns */
81 struct list_head ns_root_list; /* all root resources in ns */
82 struct obd_device *ns_obddev;
91 #define RES_HASH_BITS 14
92 #define RES_HASH_SIZE (1UL << RES_HASH_BITS)
93 #define RES_HASH_MASK (RES_HASH_SIZE - 1)
97 typedef int (*ldlm_lock_callback)(struct ldlm_lock *lock, struct ldlm_lock *new,
101 struct ldlm_resource *l_resource;
102 struct ldlm_lock *l_parent;
103 struct list_head l_children;
104 struct list_head l_childof;
105 struct list_head l_res_link; /*position in one of three res lists*/
106 ldlm_mode_t l_req_mode;
107 ldlm_mode_t l_granted_mode;
108 ldlm_lock_callback l_completion_ast;
109 ldlm_lock_callback l_blocking_ast;
110 struct lustre_peer *l_peer;
112 //XXX cluster_host l_holder;
113 __u32 l_version[RES_VERSION_SIZE];
116 typedef int (*ldlm_res_compat)(struct ldlm_resource *child,
117 struct ldlm_resource *new);
118 typedef int (*ldlm_res_policy)(struct ldlm_resource *parent, __u64 *res_id_in,
119 __u64 *res_id_out, ldlm_mode_t mode, void *data);
121 #define LDLM_PLAIN 0x0
122 #define LDLM_EXTENT 0x1
123 #define LDLM_MDSINTENT 0x2
125 extern ldlm_res_compat ldlm_res_compat_table [];
126 extern ldlm_res_policy ldlm_res_policy_table [];
128 struct ldlm_resource {
129 struct ldlm_namespace *lr_namespace;
130 struct list_head lr_hash;
131 struct list_head lr_rootlink; /* link all root resources in NS */
132 struct ldlm_resource *lr_parent; /* 0 for a root resource */
133 struct list_head lr_children; /* list head for child resources */
134 struct list_head lr_childof; /* part of child list of parent */
136 struct list_head lr_granted;
137 struct list_head lr_converting;
138 struct list_head lr_waiting;
139 ldlm_mode_t lr_most_restr;
140 atomic_t lr_refcount;
141 struct ldlm_resource *lr_root;
142 //XXX cluster_host lr_master;
143 __u64 lr_name[RES_NAME_SIZE];
144 __u32 lr_version[RES_VERSION_SIZE];
145 __u32 lr_type; /* PLAIN, EXTENT, or MDSINTENT */
148 void (*lr_blocking)(struct ldlm_lock *lock, struct ldlm_lock *new);
156 static inline struct ldlm_extent *ldlm_res2extent(struct ldlm_resource *res)
158 return (struct ldlm_extent *)(res->lr_name);
161 static inline void *ldlm_handle2object(struct ldlm_handle *handle)
163 return (void *)(unsigned long)(handle->addr);
166 static inline void ldlm_object2handle(void *object, struct ldlm_handle *handle)
168 handle->addr = (__u64)(unsigned long)object;
171 static inline void ldlm_lock(struct obd_device *obddev)
173 spin_lock(&obddev->u.ldlm.ldlm_lock);
176 static inline void ldlm_unlock(struct obd_device *obddev)
178 spin_unlock(&obddev->u.ldlm.ldlm_lock);
181 extern struct obd_ops ldlm_obd_ops;
184 int ldlm_extent_compat(struct ldlm_resource *, struct ldlm_resource *);
185 int ldlm_extent_policy(struct ldlm_resource *, __u64 *, __u64 *,
186 ldlm_mode_t, void *);
189 ldlm_error_t ldlm_local_lock_enqueue(struct obd_device *obddev,
191 struct ldlm_handle *parent_res_handle,
192 struct ldlm_handle *parent_lock_handle,
196 ldlm_lock_callback completion,
197 ldlm_lock_callback blocking,
200 struct ldlm_handle *lockh);
201 void ldlm_lock_dump(struct ldlm_lock *lock);
204 int ldlm_test(struct obd_device *device);
207 struct ldlm_namespace *ldlm_namespace_find(struct obd_device *obddev, __u32 id);
208 struct ldlm_namespace *ldlm_namespace_new(struct obd_device *obddev, __u32 id);
209 void ldlm_resource_dump(struct ldlm_resource *res);
210 struct ldlm_resource *ldlm_resource_get(struct ldlm_namespace *ns,
211 struct ldlm_resource *parent,
212 __u64 *name, int create);
213 int ldlm_resource_put(struct ldlm_resource *res);
215 #endif /* __KERNEL__ */
217 /* ioctls for trying requests */
218 #define IOC_LDLM_TYPE 'f'
219 #define IOC_LDLM_MIN_NR 40
221 #define IOC_LDLM_TEST _IOWR('f', 40, long)
222 #define IOC_LDLM_MAX_NR 41