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         rc = ldlm_local_lock_create(ns, parent_lock_handle, res_id, type, mode,
  38                                     data, data_len, lockh);
  39         if (rc != ELDLM_OK)
  40                 GOTO(out, rc);
  41
  42         lock = lustre_handle2object(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         rc = ptlrpc_queue_wait(req);
  78         rc = ptlrpc_check_status(req, rc);
  79         if (rc != ELDLM_OK) {
  80                 spin_lock(&lock->l_resource->lr_lock);
  81                 ldlm_resource_put(lock->l_resource);
  82                 spin_unlock(&lock->l_resource->lr_lock);
  83                 ldlm_lock_free(lock);
  84                 if (rc == ELDLM_LOCK_ABORTED)
  85                         rc = 0;
  86                 GOTO(out, rc);
  87         }
  88
  89         lock->l_connection = conn;
  90         lock->l_client = cl;
  91         reply = lustre_msg_buf(req->rq_repmsg, 0);
  92         memcpy(&lock->l_remote_handle, &reply->lock_handle,
  93                sizeof(lock->l_remote_handle));
  94         if (type == LDLM_EXTENT)
  95                 memcpy(cookie, &reply->lock_extent, sizeof(reply->lock_extent));
  96         *flags = reply->lock_flags;
  97
  98         CDEBUG(D_INFO, "remote handle: %p, flags: %d\n",
  99                (void *)(unsigned long)reply->lock_handle.addr, *flags);
 100         CDEBUG(D_INFO, "extent: %Lu -> %Lu\n",
 101                (unsigned long long)reply->lock_extent.start,
 102                (unsigned long long)reply->lock_extent.end);
 103
 104         if (*flags & LDLM_FL_LOCK_CHANGED) {
 105                 CDEBUG(D_INFO, "remote intent success, locking %ld instead of"
 106                        "%ld\n", (long)reply->lock_resource_name[0],
 107                        (long)lock->l_resource->lr_name[0]);
 108                 ldlm_resource_put(lock->l_resource);
 109
 110                 lock->l_resource =
 111                         ldlm_resource_get(ns, NULL, reply->lock_resource_name,
 112                                           type, 1);
 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         EXIT;
 139  out:
 140         return rc;
 141 }
 142
 143 int ldlm_cli_callback(struct ldlm_lock *lock, struct ldlm_lock *new,
 144                       void *data, __u32 data_len, struct ptlrpc_request **reqp)
 145 {
 146         struct ldlm_request *body;
 147         struct ptlrpc_request *req;
 148         struct ptlrpc_client *cl =
 149                 &lock->l_resource->lr_namespace->ns_rpc_client;
 150         int rc = 0, size = sizeof(*body);
 151         ENTRY;
 152
 153         req = ptlrpc_prep_req(cl, lock->l_connection, LDLM_CALLBACK, 1,
 154                               &size, NULL);
 155         if (!req)
 156                 GOTO(out, rc = -ENOMEM);
 157
 158         body = lustre_msg_buf(req->rq_reqmsg, 0);
 159         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 160                sizeof(body->lock_handle1));
 161
 162         if (new == NULL) {
 163                 CDEBUG(D_NET, "Sending granted AST\n");
 164                 ldlm_lock2desc(lock, &body->lock_desc);
 165         } else {
 166                 CDEBUG(D_NET, "Sending blocked AST\n");
 167                 ldlm_lock2desc(new, &body->lock_desc);
 168                 ldlm_object2handle(new, &body->lock_handle2);
 169         }
 170
 171         LDLM_DEBUG(lock, "server preparing %s AST",
 172                    new == NULL ? "completion" : "blocked");
 173
 174         req->rq_replen = lustre_msg_size(0, NULL);
 175
 176         if (reqp == NULL) {
 177                 rc = ptlrpc_queue_wait(req);
 178                 rc = ptlrpc_check_status(req, rc);
 179                 ptlrpc_free_req(req);
 180         } else
 181                 *reqp = req;
 182
 183         EXIT;
 184  out:
 185         return rc;
 186 }
 187
 188 int ldlm_cli_convert(struct ptlrpc_client *cl, struct lustre_handle *lockh,
 189                      int new_mode, int *flags)
 190 {
 191         struct ldlm_request *body;
 192         struct ldlm_reply *reply;
 193         struct ldlm_lock *lock;
 194         struct ldlm_resource *res;
 195         struct ptlrpc_request *req;
 196         int rc, size = sizeof(*body);
 197         ENTRY;
 198
 199         lock = lustre_handle2object(lockh);
 200         *flags = 0;
 201
 202         LDLM_DEBUG(lock, "client-side convert");
 203
 204         req = ptlrpc_prep_req(cl, lock->l_connection, LDLM_CONVERT, 1, &size,
 205                               NULL);
 206         if (!req)
 207                 GOTO(out, rc = -ENOMEM);
 208
 209         body = lustre_msg_buf(req->rq_reqmsg, 0);
 210         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 211                sizeof(body->lock_handle1));
 212
 213         body->lock_desc.l_req_mode = new_mode;
 214         body->lock_flags = *flags;
 215
 216         size = sizeof(*reply);
 217         req->rq_replen = lustre_msg_size(1, &size);
 218
 219         rc = ptlrpc_queue_wait(req);
 220         rc = ptlrpc_check_status(req, rc);
 221         if (rc != ELDLM_OK)
 222                 GOTO(out, rc);
 223
 224         reply = lustre_msg_buf(req->rq_repmsg, 0);
 225         res = ldlm_local_lock_convert(lockh, new_mode, &reply->lock_flags);
 226         if (res != NULL)
 227                 ldlm_reprocess_all(res);
 228         if (lock->l_req_mode != lock->l_granted_mode) {
 229                 /* Go to sleep until the lock is granted. */
 230                 /* FIXME: or cancelled. */
 231                 CDEBUG(D_NET, "convert returned a blocked lock, "
 232                        "going to sleep.\n");
 233                 wait_event_interruptible(lock->l_waitq, lock->l_req_mode ==
 234                                          lock->l_granted_mode);
 235                 CDEBUG(D_NET, "waking up, the lock must be granted.\n");
 236         }
 237         EXIT;
 238  out:
 239         ptlrpc_free_req(req);
 240         return rc;
 241 }
 242
 243 int ldlm_cli_cancel(struct ptlrpc_client *cl, struct ldlm_lock *lock)
 244 {
 245         struct ptlrpc_request *req;
 246         struct ldlm_request *body;
 247         struct ldlm_resource *res;
 248         int rc, size = sizeof(*body);
 249         ENTRY;
 250
 251         LDLM_DEBUG(lock, "client-side cancel");
 252         req = ptlrpc_prep_req(cl, lock->l_connection, LDLM_CANCEL, 1, &size,
 253                               NULL);
 254         if (!req)
 255                 GOTO(out, rc = -ENOMEM);
 256
 257         body = lustre_msg_buf(req->rq_reqmsg, 0);
 258         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 259                sizeof(body->lock_handle1));
 260
 261         req->rq_replen = lustre_msg_size(0, NULL);
 262
 263         rc = ptlrpc_queue_wait(req);
 264         rc = ptlrpc_check_status(req, rc);
 265         ptlrpc_free_req(req);
 266         if (rc != ELDLM_OK)
 267                 GOTO(out, rc);
 268
 269         res = ldlm_local_lock_cancel(lock);
 270         if (res != NULL)
 271                 ldlm_reprocess_all(res);
 272         else
 273                 rc = ELDLM_RESOURCE_FREED;
 274         EXIT;
 275  out:
 276         return rc;
 277 }