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__
10 #include <linux/obd_class.h>
11 #include <linux/lustre_net.h>
13 #define OBD_LDLM_DEVICENAME "ldlm"
18 ELDLM_LOCK_CHANGED = 300,
19 ELDLM_LOCK_ABORTED = 301,
20 ELDLM_RESOURCE_FREED = 302,
22 ELDLM_NAMESPACE_EXISTS = 400,
23 ELDLM_BAD_NAMESPACE = 401
26 #define LDLM_NAMESPACE_SERVER 0
27 #define LDLM_NAMESPACE_CLIENT 1
29 #define LDLM_FL_LOCK_CHANGED (1 << 0)
30 #define LDLM_FL_BLOCK_GRANTED (1 << 1)
31 #define LDLM_FL_BLOCK_CONV (1 << 2)
32 #define LDLM_FL_BLOCK_WAIT (1 << 3)
33 #define LDLM_FL_DYING (1 << 4)
34 #define LDLM_FL_AST_SENT (1 << 5)
35 #define LDLM_FL_BLOCKED_PENDING (1 << 6)
37 #define L2B(c) (1 << c)
39 /* compatibility matrix */
40 #define LCK_COMPAT_EX L2B(LCK_NL)
41 #define LCK_COMPAT_PW (LCK_COMPAT_EX | L2B(LCK_CR))
42 #define LCK_COMPAT_PR (LCK_COMPAT_PW | L2B(LCK_PR))
43 #define LCK_COMPAT_CW (LCK_COMPAT_PW | L2B(LCK_CW))
44 #define LCK_COMPAT_CR (LCK_COMPAT_CW | L2B(LCK_PR) | L2B(LCK_PW))
45 #define LCK_COMPAT_NL (LCK_COMPAT_CR | L2B(LCK_EX))
47 static ldlm_mode_t lck_compat_array[] = {
48 [LCK_EX] LCK_COMPAT_EX,
49 [LCK_PW] LCK_COMPAT_PW,
50 [LCK_PR] LCK_COMPAT_PR,
51 [LCK_CW] LCK_COMPAT_CW,
52 [LCK_CR] LCK_COMPAT_CR,
53 [LCK_NL] LCK_COMPAT_NL
56 static inline int lockmode_compat(ldlm_mode_t exist, ldlm_mode_t new)
58 if (exist < LCK_EX || exist > LCK_NL)
60 if (new < LCK_EX || new > LCK_NL)
63 return (lck_compat_array[exist] & L2B(new));
72 #define DLM_OST_NAMESPACE 1
73 #define DLM_MDS_NAMESPACE 2
76 - do we just separate this by security domains and use a prefix for
77 multiple namespaces in the same domain?
81 struct ldlm_namespace {
83 struct ptlrpc_client ns_rpc_client; /* used for revocation callbacks */
84 __u32 ns_client; /* is this a client-side lock tree? */
85 struct list_head *ns_hash; /* hash table for ns */
86 __u32 ns_refcount; /* count of resources in the hash */
87 struct list_head ns_root_list; /* all root resources in ns */
88 struct lustre_lock ns_lock; /* protects hash, refcount, list */
97 #define RES_HASH_BITS 14
98 #define RES_HASH_SIZE (1UL << RES_HASH_BITS)
99 #define RES_HASH_MASK (RES_HASH_SIZE - 1)
103 typedef int (*ldlm_lock_callback)(struct ldlm_lock *lock, struct ldlm_lock *new,
104 void *data, __u32 data_len,
105 struct ptlrpc_request **req);
108 struct ldlm_resource *l_resource;
109 struct ldlm_lock *l_parent;
110 struct list_head l_children;
111 struct list_head l_childof;
112 struct list_head l_res_link; /*position in one of three res lists*/
115 ldlm_mode_t l_req_mode;
116 ldlm_mode_t l_granted_mode;
118 ldlm_lock_callback l_completion_ast;
119 ldlm_lock_callback l_blocking_ast;
121 struct ptlrpc_connection *l_connection;
122 struct ptlrpc_client *l_client;
124 struct lustre_handle l_remote_handle;
129 struct ldlm_extent l_extent;
130 __u32 l_version[RES_VERSION_SIZE];
135 /* If the lock is granted, a process sleeps on this waitq to learn when
136 * it's no longer in use. If the lock is not granted, a process sleeps
137 * on this waitq to learn when it becomes granted. */
138 wait_queue_head_t l_waitq;
141 typedef int (*ldlm_res_compat)(struct ldlm_lock *child, struct ldlm_lock *new);
142 typedef int (*ldlm_res_policy)(struct ldlm_lock *lock, void *req_cookie,
143 ldlm_mode_t mode, void *data);
145 #define LDLM_PLAIN 10
146 #define LDLM_EXTENT 11
147 #define LDLM_MDSINTENT 12
149 #define LDLM_MIN_TYPE 10
150 #define LDLM_MAX_TYPE 12
152 extern ldlm_res_compat ldlm_res_compat_table [];
153 extern ldlm_res_policy ldlm_res_policy_table [];
155 struct ldlm_resource {
156 struct ldlm_namespace *lr_namespace;
157 struct list_head lr_hash;
158 struct list_head lr_rootlink; /* link all root resources in NS */
159 struct ldlm_resource *lr_parent; /* 0 for a root resource */
160 struct list_head lr_children; /* list head for child resources */
161 struct list_head lr_childof; /* part of child list of parent */
163 struct list_head lr_granted;
164 struct list_head lr_converting;
165 struct list_head lr_waiting;
166 ldlm_mode_t lr_most_restr;
167 __u32 lr_type; /* PLAIN, EXTENT, or MDSINTENT */
168 struct ldlm_resource *lr_root;
169 __u64 lr_name[RES_NAME_SIZE];
170 __u32 lr_version[RES_VERSION_SIZE];
171 atomic_t lr_refcount;
175 static inline struct ldlm_extent *ldlm_res2extent(struct ldlm_resource *res)
177 return (struct ldlm_extent *)(res->lr_name);
180 extern struct obd_ops ldlm_obd_ops;
182 #define LDLM_DEBUG(lock, format, a...) \
184 CDEBUG(D_DLMTRACE, "### " format \
185 " (%s: lock %p mode %d/%d on res %Lu (rc %d) " \
186 " type %d remote %Lx)\n" , ## a, \
187 lock->l_resource->lr_namespace->ns_name, lock, \
188 lock->l_granted_mode, lock->l_req_mode, \
189 lock->l_resource->lr_name[0], \
190 atomic_read(&lock->l_resource->lr_refcount), \
191 lock->l_resource->lr_type, \
192 lock->l_remote_handle.addr); \
195 #define LDLM_DEBUG_NOLOCK(format, a...) \
196 CDEBUG(D_DLMTRACE, "### " format "\n" , ## a)
199 int ldlm_extent_compat(struct ldlm_lock *, struct ldlm_lock *);
200 int ldlm_extent_policy(struct ldlm_lock *, void *, ldlm_mode_t, void *);
203 void ldlm_lock_free(struct ldlm_lock *lock);
204 void ldlm_lock2desc(struct ldlm_lock *lock, struct ldlm_lock_desc *desc);
205 void ldlm_lock_addref(struct ldlm_lock *lock, __u32 mode);
206 void ldlm_lock_decref(struct ldlm_lock *lock, __u32 mode);
207 void ldlm_grant_lock(struct ldlm_resource *res, struct ldlm_lock *lock);
208 int ldlm_local_lock_match(struct ldlm_namespace *ns, __u64 *res_id, __u32 type,
209 void *cookie, int cookielen, ldlm_mode_t mode,
210 struct lustre_handle *lockh);
211 ldlm_error_t ldlm_local_lock_create(struct ldlm_namespace *ns,
212 struct lustre_handle *parent_lock_handle,
213 __u64 *res_id, __u32 type,
217 struct lustre_handle *lockh);
218 ldlm_error_t ldlm_local_lock_enqueue(struct lustre_handle *lockh,
219 void *cookie, int cookie_len,
221 ldlm_lock_callback completion,
222 ldlm_lock_callback blocking);
223 struct ldlm_resource *ldlm_local_lock_convert(struct lustre_handle *lockh,
224 int new_mode, int *flags);
225 struct ldlm_resource *ldlm_local_lock_cancel(struct ldlm_lock *lock);
226 void ldlm_reprocess_all(struct ldlm_resource *res);
227 void ldlm_lock_dump(struct ldlm_lock *lock);
230 int ldlm_test(struct obd_device *device, struct ptlrpc_connection *conn);
233 struct ldlm_namespace *ldlm_namespace_new(char *name, __u32 local);
234 int ldlm_namespace_free(struct ldlm_namespace *ns);
236 /* resource.c - internal */
237 struct ldlm_resource *ldlm_resource_get(struct ldlm_namespace *ns,
238 struct ldlm_resource *parent,
239 __u64 *name, __u32 type, int create);
240 struct ldlm_resource *ldlm_resource_addref(struct ldlm_resource *res);
241 int ldlm_resource_put(struct ldlm_resource *res);
242 void ldlm_resource_add_lock(struct ldlm_resource *res, struct list_head *head,
243 struct ldlm_lock *lock);
244 int ldlm_resource_del_lock(struct ldlm_lock *lock);
245 void ldlm_res2desc(struct ldlm_resource *res, struct ldlm_resource_desc *desc);
246 void ldlm_resource_dump(struct ldlm_resource *res);
249 int ldlm_cli_enqueue(struct ptlrpc_client *cl,
250 struct ptlrpc_connection *peer,
251 struct ptlrpc_request *req,
252 struct ldlm_namespace *ns,
253 struct lustre_handle *parent_lock_handle,
256 void *cookie, int cookielen,
259 ldlm_lock_callback callback,
262 struct lustre_handle *lockh);
263 int ldlm_cli_callback(struct ldlm_lock *lock, struct ldlm_lock *new,
264 void *data, __u32 data_len, struct ptlrpc_request **reqp);
265 int ldlm_cli_convert(struct ptlrpc_client *, struct lustre_handle *,
266 int new_mode, int *flags);
267 int ldlm_cli_cancel(struct ptlrpc_client *, struct ldlm_lock *);
269 #endif /* __KERNEL__ */
271 /* ioctls for trying requests */
272 #define IOC_LDLM_TYPE 'f'
273 #define IOC_LDLM_MIN_NR 40
275 #define IOC_LDLM_TEST _IOWR('f', 40, long)
276 #define IOC_LDLM_MAX_NR 41