1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (C) 2002 Cluster File Systems, Inc.
6 * This code is issued under the GNU General Public License.
7 * See the file COPYING in this distribution
9 * by Cluster File Systems, Inc.
12 #define DEBUG_SUBSYSTEM S_LDLM
14 #include <linux/lustre_dlm.h>
16 int ldlm_completion_ast(struct ldlm_lock *lock, int flags)
20 if (flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED |
21 LDLM_FL_BLOCK_CONV)) {
22 /* Go to sleep until the lock is granted. */
23 /* FIXME: or cancelled. */
24 LDLM_DEBUG(lock, "client-side enqueue returned a blocked lock,"
27 ldlm_reprocess_all(lock->l_resource);
28 wait_event(lock->l_waitq, (lock->l_req_mode ==
29 lock->l_granted_mode));
30 LDLM_DEBUG(lock, "client-side enqueue waking up: granted");
31 } else if (flags == LDLM_FL_WAIT_NOREPROC) {
32 wait_event(lock->l_waitq, (lock->l_req_mode ==
33 lock->l_granted_mode));
34 } else if (flags == 0) {
35 wake_up(&lock->l_waitq);
41 static int ldlm_cli_enqueue_local(struct ldlm_namespace *ns,
42 struct lustre_handle *parent_lockh,
45 void *cookie, int cookielen,
48 ldlm_completion_callback completion,
49 ldlm_blocking_callback blocking,
52 struct lustre_handle *lockh)
54 struct ldlm_lock *lock;
58 CERROR("Trying to cancel local lock\n");
62 lock = ldlm_lock_create(ns, parent_lockh, res_id, type, mode, NULL, 0);
64 GOTO(out_nolock, err = -ENOMEM);
65 LDLM_DEBUG(lock, "client-side local enqueue handler, new lock created");
67 ldlm_lock_addref_internal(lock, mode);
68 ldlm_lock2handle(lock, lockh);
71 err = ldlm_lock_enqueue(lock, cookie, cookielen, flags, completion,
76 if (type == LDLM_EXTENT)
77 memcpy(cookie, &lock->l_extent, sizeof(lock->l_extent));
78 if ((*flags) & LDLM_FL_LOCK_CHANGED)
79 memcpy(res_id, lock->l_resource->lr_name, sizeof(*res_id));
81 LDLM_DEBUG_NOLOCK("client-side local enqueue handler END (lock %p)",
84 if (lock->l_completion_ast)
85 lock->l_completion_ast(lock, *flags);
87 LDLM_DEBUG(lock, "client-side local enqueue END");
95 int ldlm_cli_enqueue(struct lustre_handle *connh,
96 struct ptlrpc_request *req,
97 struct ldlm_namespace *ns,
98 struct lustre_handle *parent_lock_handle,
101 void *cookie, int cookielen,
104 ldlm_completion_callback completion,
105 ldlm_blocking_callback blocking,
108 struct lustre_handle *lockh)
110 struct ptlrpc_connection *connection;
111 struct ldlm_lock *lock;
112 struct ldlm_request *body;
113 struct ldlm_reply *reply;
114 int rc, size = sizeof(*body), req_passed_in = 1;
118 return ldlm_cli_enqueue_local(ns, parent_lock_handle, res_id,
119 type, cookie, cookielen, mode,
120 flags, completion, blocking, data,
122 connection = client_conn2cli(connh)->cl_conn;
125 lock = ldlm_lock_create(ns, parent_lock_handle, res_id, type, mode,
128 GOTO(out_nolock, rc = -ENOMEM);
129 LDLM_DEBUG(lock, "client-side enqueue START");
130 /* for the local lock, add the reference */
131 ldlm_lock_addref_internal(lock, mode);
132 ldlm_lock2handle(lock, lockh);
135 req = ptlrpc_prep_req2(connh, LDLM_ENQUEUE, 1, &size, NULL);
137 GOTO(out, rc = -ENOMEM);
139 } else if (req->rq_reqmsg->buflens[0] != sizeof(*body))
142 /* Dump all of this data into the request buffer */
143 body = lustre_msg_buf(req->rq_reqmsg, 0);
144 ldlm_lock2desc(lock, &body->lock_desc);
145 /* Phil: make this part of ldlm_lock2desc */
146 if (type == LDLM_EXTENT)
147 memcpy(&body->lock_desc.l_extent, cookie,
148 sizeof(body->lock_desc.l_extent));
149 body->lock_flags = *flags;
151 memcpy(&body->lock_handle1, lockh, sizeof(*lockh));
152 if (parent_lock_handle)
153 memcpy(&body->lock_handle2, parent_lock_handle,
154 sizeof(body->lock_handle2));
156 /* Continue as normal. */
157 if (!req_passed_in) {
158 size = sizeof(*reply);
159 req->rq_replen = lustre_msg_size(1, &size);
161 lock->l_connh = connh;
162 lock->l_connection = ptlrpc_connection_addref(connection);
163 lock->l_client = client_conn2cli(connh)->cl_client;
165 rc = ptlrpc_queue_wait(req);
166 /* FIXME: status check here? */
167 rc = ptlrpc_check_status(req, rc);
169 if (rc != ELDLM_OK) {
170 LDLM_DEBUG(lock, "client-side enqueue END (%s)",
171 rc == ELDLM_LOCK_ABORTED ? "ABORTED" : "FAILED");
172 ldlm_lock_decref(lockh, mode);
173 /* FIXME: if we've already received a completion AST, this will
175 ldlm_lock_destroy(lock);
179 reply = lustre_msg_buf(req->rq_repmsg, 0);
180 memcpy(&lock->l_remote_handle, &reply->lock_handle,
181 sizeof(lock->l_remote_handle));
182 if (type == LDLM_EXTENT)
183 memcpy(cookie, &reply->lock_extent, sizeof(reply->lock_extent));
184 *flags = reply->lock_flags;
186 CDEBUG(D_INFO, "remote handle: %p, flags: %d\n",
187 (void *)(unsigned long)reply->lock_handle.addr, *flags);
188 CDEBUG(D_INFO, "extent: %Lu -> %Lu\n",
189 (unsigned long long)reply->lock_extent.start,
190 (unsigned long long)reply->lock_extent.end);
192 /* If enqueue returned a blocked lock but the completion handler has
193 * already run, then it fixed up the resource and we don't need to do it
195 if ((*flags) & LDLM_FL_LOCK_CHANGED) {
196 int newmode = reply->lock_mode;
197 if (newmode && newmode != lock->l_req_mode) {
198 LDLM_DEBUG(lock, "server returned different mode %s",
199 ldlm_lockname[newmode]);
200 lock->l_req_mode = newmode;
203 if (reply->lock_resource_name[0] !=
204 lock->l_resource->lr_name[0]) {
205 CDEBUG(D_INFO, "remote intent success, locking %ld "
207 (long)reply->lock_resource_name[0],
208 (long)lock->l_resource->lr_name[0]);
210 ldlm_lock_change_resource(lock,
211 reply->lock_resource_name);
212 if (lock->l_resource == NULL) {
216 LDLM_DEBUG(lock, "client-side enqueue, new resource");
221 ptlrpc_free_req(req);
223 rc = ldlm_lock_enqueue(lock, cookie, cookielen, flags, completion,
225 if (lock->l_completion_ast)
226 lock->l_completion_ast(lock, *flags);
228 LDLM_DEBUG(lock, "client-side enqueue END");
236 int ldlm_match_or_enqueue(struct lustre_handle *connh,
237 struct ptlrpc_request *req,
238 struct ldlm_namespace *ns,
239 struct lustre_handle *parent_lock_handle,
242 void *cookie, int cookielen,
245 ldlm_completion_callback completion,
246 ldlm_blocking_callback blocking,
249 struct lustre_handle *lockh)
253 rc = ldlm_lock_match(ns, res_id, type, cookie, cookielen, mode, lockh);
255 rc = ldlm_cli_enqueue(connh, req, ns,
256 parent_lock_handle, res_id, type, cookie,
257 cookielen, mode, flags, completion,
258 blocking, data, data_len, lockh);
260 CERROR("ldlm_cli_enqueue: err: %d\n", rc);
266 static int ldlm_cli_convert_local(struct ldlm_lock *lock, int new_mode,
270 if (lock->l_resource->lr_namespace->ns_client) {
271 CERROR("Trying to cancel local lock\n");
274 LDLM_DEBUG(lock, "client-side local convert");
276 ldlm_lock_convert(lock, new_mode, flags);
277 ldlm_reprocess_all(lock->l_resource);
279 LDLM_DEBUG(lock, "client-side local convert handler END");
284 int ldlm_cli_convert(struct lustre_handle *lockh, int new_mode, int *flags)
286 struct ldlm_request *body;
287 struct lustre_handle *connh;
288 struct ldlm_reply *reply;
289 struct ldlm_lock *lock;
290 struct ldlm_resource *res;
291 struct ptlrpc_request *req;
292 int rc, size = sizeof(*body);
295 lock = ldlm_handle2lock(lockh);
301 connh = lock->l_connh;
304 return ldlm_cli_convert_local(lock, new_mode, flags);
306 LDLM_DEBUG(lock, "client-side convert");
308 req = ptlrpc_prep_req2(connh, LDLM_CONVERT, 1, &size, NULL);
310 GOTO(out, rc = -ENOMEM);
312 body = lustre_msg_buf(req->rq_reqmsg, 0);
313 memcpy(&body->lock_handle1, &lock->l_remote_handle,
314 sizeof(body->lock_handle1));
316 body->lock_desc.l_req_mode = new_mode;
317 body->lock_flags = *flags;
319 size = sizeof(*reply);
320 req->rq_replen = lustre_msg_size(1, &size);
322 rc = ptlrpc_queue_wait(req);
323 rc = ptlrpc_check_status(req, rc);
327 reply = lustre_msg_buf(req->rq_repmsg, 0);
328 res = ldlm_lock_convert(lock, new_mode, &reply->lock_flags);
330 ldlm_reprocess_all(res);
331 /* Go to sleep until the lock is granted. */
332 /* FIXME: or cancelled. */
333 if (lock->l_completion_ast)
334 lock->l_completion_ast(lock, LDLM_FL_WAIT_NOREPROC);
338 ptlrpc_free_req(req);
342 int ldlm_cli_cancel(struct lustre_handle *lockh)
344 struct ptlrpc_request *req;
345 struct ldlm_lock *lock;
346 struct ldlm_request *body;
347 int rc = 0, size = sizeof(*body);
350 lock = ldlm_handle2lock(lockh);
352 /* It's possible that the decref that we did just before this
353 * cancel was the last reader/writer, and caused a cancel before
354 * we could call this function. If we want to make this
355 * impossible (by adding a dec_and_cancel() or similar), then
356 * we can put the LBUG back. */
362 LDLM_DEBUG(lock, "client-side cancel");
363 req = ptlrpc_prep_req2(lock->l_connh, LDLM_CANCEL, 1, &size,
366 GOTO(out, rc = -ENOMEM);
368 body = lustre_msg_buf(req->rq_reqmsg, 0);
369 memcpy(&body->lock_handle1, &lock->l_remote_handle,
370 sizeof(body->lock_handle1));
372 req->rq_replen = lustre_msg_size(0, NULL);
374 rc = ptlrpc_queue_wait(req);
375 rc = ptlrpc_check_status(req, rc);
376 ptlrpc_free_req(req);
380 ldlm_lock_cancel(lock);
382 LDLM_DEBUG(lock, "client-side local cancel");
383 if (lock->l_resource->lr_namespace->ns_client) {
384 CERROR("Trying to cancel local lock\n");
387 ldlm_lock_cancel(lock);
388 ldlm_reprocess_all(lock->l_resource);
389 LDLM_DEBUG(lock, "client-side local cancel handler END");