lustre/ldlm/ldlm_request.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Copyright (C) 2002 Cluster File Systems, Inc.
   5  *
   6  * This code is issued under the GNU General Public License.
   7  * See the file COPYING in this distribution
   8  *
   9  * by Cluster File Systems, Inc.
  10  */
  11
  12 #define DEBUG_SUBSYSTEM S_LDLM
  13
  14 #include <linux/lustre_dlm.h>
  15
  16 int ldlm_cli_enqueue(struct ptlrpc_client *cl, struct ptlrpc_connection *conn,
  17                      struct ptlrpc_request *req,
  18                      struct ldlm_namespace *ns,
  19                      struct lustre_handle *parent_lock_handle,
  20                      __u64 *res_id,
  21                      __u32 type,
  22                      void *cookie, int cookielen,
  23                      ldlm_mode_t mode,
  24                      int *flags,
  25                      ldlm_lock_callback callback,
  26                      void *data,
  27                      __u32 data_len,
  28                      struct lustre_handle *lockh)
  29 {
  30         struct ldlm_lock *lock;
  31         struct ldlm_request *body;
  32         struct ldlm_reply *reply;
  33         int rc, size = sizeof(*body), req_passed_in = 1;
  34         ENTRY;
  35
  36         *flags = 0;
  37         lock = ldlm_local_lock_create(ns, parent_lock_handle, res_id, type,
  38                                       mode, data, data_len);
  39         if (lock == NULL)
  40                 GOTO(out, rc = -ENOMEM);
  41
  42         ldlm_lock2handle(lock, &lockh);
  43         LDLM_DEBUG(lock, "client-side enqueue START");
  44
  45         if (req == NULL) {
  46                 req = ptlrpc_prep_req(cl, conn, LDLM_ENQUEUE, 1, &size, NULL);
  47                 if (!req)
  48                         GOTO(out, rc = -ENOMEM);
  49                 req_passed_in = 0;
  50         } else if (req->rq_reqmsg->buflens[0] != sizeof(*body))
  51                 LBUG();
  52
  53         /* Dump all of this data into the request buffer */
  54         body = lustre_msg_buf(req->rq_reqmsg, 0);
  55         body->lock_desc.l_resource.lr_type = type;
  56         memcpy(body->lock_desc.l_resource.lr_name, res_id,
  57                sizeof(body->lock_desc.l_resource.lr_name));
  58
  59         body->lock_desc.l_req_mode = mode;
  60         if (type == LDLM_EXTENT)
  61                 memcpy(&body->lock_desc.l_extent, cookie,
  62                        sizeof(body->lock_desc.l_extent));
  63         body->lock_flags = *flags;
  64
  65         memcpy(&body->lock_handle1, lockh, sizeof(body->lock_handle1));
  66
  67         if (parent_lock_handle)
  68                 memcpy(&body->lock_handle2, parent_lock_handle,
  69                        sizeof(body->lock_handle2));
  70
  71         /* Continue as normal. */
  72         if (!req_passed_in) {
  73                 size = sizeof(*reply);
  74                 req->rq_replen = lustre_msg_size(1, &size);
  75         }
  76
  77         lock->l_connection = conn;
  78         lock->l_client = cl;
  79
  80         rc = ptlrpc_queue_wait(req);
  81         rc = ptlrpc_check_status(req, rc);
  82
  83         if (rc != ELDLM_OK) {
  84                 LDLM_DEBUG(lock, "client-side enqueue END (%s)",
  85                            rc == ELDLM_LOCK_ABORTED ? "ABORTED" : "FAILED");
  86                 ldlm_lock_put(lock);
  87                 GOTO(out, rc);
  88         }
  89
  90         reply = lustre_msg_buf(req->rq_repmsg, 0);
  91         memcpy(&lock->l_remote_handle, &reply->lock_handle,
  92                sizeof(lock->l_remote_handle));
  93         if (type == LDLM_EXTENT)
  94                 memcpy(cookie, &reply->lock_extent, sizeof(reply->lock_extent));
  95         *flags = reply->lock_flags;
  96
  97         CDEBUG(D_INFO, "remote handle: %p, flags: %d\n",
  98                (void *)(unsigned long)reply->lock_handle.addr, *flags);
  99         CDEBUG(D_INFO, "extent: %Lu -> %Lu\n",
 100                (unsigned long long)reply->lock_extent.start,
 101                (unsigned long long)reply->lock_extent.end);
 102
 103         /* If enqueue returned a blocked lock but the completion handler has
 104          * already run, then it fixed up the resource and we don't need to do it
 105          * again. */
 106         if (*flags & LDLM_FL_LOCK_CHANGED &&
 107             lock->l_req_mode != lock->l_granted_mode) {
 108                 CDEBUG(D_INFO, "remote intent success, locking %ld instead of"
 109                        "%ld\n", (long)reply->lock_resource_name[0],
 110                        (long)lock->l_resource->lr_name[0]);
 111
 112                 ldlm_lock_change_resource(lock, reply->lock_resource_name);
 113                 if (lock->l_resource == NULL) {
 114                         LBUG();
 115                         RETURN(-ENOMEM);
 116                 }
 117                 LDLM_DEBUG(lock, "client-side enqueue, new resource");
 118         }
 119
 120         if (!req_passed_in)
 121                 ptlrpc_free_req(req);
 122
 123         rc = ldlm_local_lock_enqueue(lockh, cookie, cookielen, flags, callback,
 124                                      callback);
 125
 126         LDLM_DEBUG(lock, "client-side enqueue END");
 127         if (*flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED |
 128                       LDLM_FL_BLOCK_CONV)) {
 129                 /* Go to sleep until the lock is granted. */
 130                 /* FIXME: or cancelled. */
 131                 CDEBUG(D_NET, "enqueue returned a blocked lock (%p), "
 132                        "going to sleep.\n", lock);
 133                 ldlm_lock_dump(lock);
 134                 wait_event_interruptible(lock->l_waitq, lock->l_req_mode ==
 135                                          lock->l_granted_mode);
 136                 CDEBUG(D_NET, "waking up, the lock must be granted.\n");
 137         }
 138         ldlm_lock_put(lock);
 139         EXIT;
 140  out:
 141         return rc;
 142 }
 143
 144 int ldlm_cli_callback(struct ldlm_lock *lock, struct ldlm_lock *new,
 145                       void *data, __u32 data_len, struct ptlrpc_request **reqp)
 146 {
 147         struct ldlm_request *body;
 148         struct ptlrpc_request *req;
 149         struct ptlrpc_client *cl =
 150                 &lock->l_resource->lr_namespace->ns_rpc_client;
 151         int rc = 0, size = sizeof(*body);
 152         ENTRY;
 153
 154         req = ptlrpc_prep_req(cl, lock->l_connection, LDLM_CALLBACK, 1,
 155                               &size, NULL);
 156         if (!req)
 157                 GOTO(out, rc = -ENOMEM);
 158
 159         body = lustre_msg_buf(req->rq_reqmsg, 0);
 160         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 161                sizeof(body->lock_handle1));
 162
 163         if (new == NULL) {
 164                 CDEBUG(D_NET, "Sending granted AST\n");
 165                 ldlm_lock2desc(lock, &body->lock_desc);
 166         } else {
 167                 CDEBUG(D_NET, "Sending blocked AST\n");
 168                 ldlm_lock2desc(new, &body->lock_desc);
 169                 ldlm_object2handle(new, &body->lock_handle2);
 170         }
 171
 172         LDLM_DEBUG(lock, "server preparing %s AST",
 173                    new == NULL ? "completion" : "blocked");
 174
 175         req->rq_replen = lustre_msg_size(0, NULL);
 176
 177         if (reqp == NULL) {
 178                 LBUG();
 179                 rc = ptlrpc_queue_wait(req);
 180                 rc = ptlrpc_check_status(req, rc);
 181                 ptlrpc_free_req(req);
 182         } else
 183                 *reqp = req;
 184
 185         EXIT;
 186  out:
 187         return rc;
 188 }
 189
 190 int ldlm_cli_convert(struct ptlrpc_client *cl, struct lustre_handle *lockh,
 191                      int new_mode, int *flags)
 192 {
 193         struct ldlm_request *body;
 194         struct ldlm_reply *reply;
 195         struct ldlm_lock *lock;
 196         struct ldlm_resource *res;
 197         struct ptlrpc_request *req;
 198         int rc, size = sizeof(*body);
 199         ENTRY;
 200
 201         lock = lustre_handle2object(lockh);
 202         *flags = 0;
 203
 204         LDLM_DEBUG(lock, "client-side convert");
 205
 206         req = ptlrpc_prep_req(cl, lock->l_connection, LDLM_CONVERT, 1, &size,
 207                               NULL);
 208         if (!req)
 209                 GOTO(out, rc = -ENOMEM);
 210
 211         body = lustre_msg_buf(req->rq_reqmsg, 0);
 212         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 213                sizeof(body->lock_handle1));
 214
 215         body->lock_desc.l_req_mode = new_mode;
 216         body->lock_flags = *flags;
 217
 218         size = sizeof(*reply);
 219         req->rq_replen = lustre_msg_size(1, &size);
 220
 221         rc = ptlrpc_queue_wait(req);
 222         rc = ptlrpc_check_status(req, rc);
 223         if (rc != ELDLM_OK)
 224                 GOTO(out, rc);
 225
 226         reply = lustre_msg_buf(req->rq_repmsg, 0);
 227         res = ldlm_local_lock_convert(lockh, new_mode, &reply->lock_flags);
 228         if (res != NULL)
 229                 ldlm_reprocess_all(res);
 230         if (lock->l_req_mode != lock->l_granted_mode) {
 231                 /* Go to sleep until the lock is granted. */
 232                 /* FIXME: or cancelled. */
 233                 CDEBUG(D_NET, "convert returned a blocked lock, "
 234                        "going to sleep.\n");
 235                 wait_event_interruptible(lock->l_waitq, lock->l_req_mode ==
 236                                          lock->l_granted_mode);
 237                 CDEBUG(D_NET, "waking up, the lock must be granted.\n");
 238         }
 239         EXIT;
 240  out:
 241         ptlrpc_free_req(req);
 242         return rc;
 243 }
 244
 245 int ldlm_cli_cancel(struct ptlrpc_client *cl, struct ldlm_lock *lock)
 246 {
 247         struct ptlrpc_request *req;
 248         struct ldlm_request *body;
 249         struct ldlm_resource *res;
 250         int rc, size = sizeof(*body);
 251         ENTRY;
 252
 253         LDLM_DEBUG(lock, "client-side cancel");
 254         req = ptlrpc_prep_req(cl, lock->l_connection, LDLM_CANCEL, 1, &size,
 255                               NULL);
 256         if (!req)
 257                 GOTO(out, rc = -ENOMEM);
 258
 259         body = lustre_msg_buf(req->rq_reqmsg, 0);
 260         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 261                sizeof(body->lock_handle1));
 262
 263         req->rq_replen = lustre_msg_size(0, NULL);
 264
 265         rc = ptlrpc_queue_wait(req);
 266         rc = ptlrpc_check_status(req, rc);
 267         ptlrpc_free_req(req);
 268         if (rc != ELDLM_OK)
 269                 GOTO(out, rc);
 270
 271         res = ldlm_local_lock_cancel(lock);
 272         if (res != NULL)
 273                 ldlm_reprocess_all(res);
 274         else
 275                 rc = ELDLM_RESOURCE_FREED;
 276         EXIT;
 277  out:
 278         return rc;
 279 }