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_lock_create(ns, parent_lock_handle, res_id, type, mode,
  38                                 data, data_len);
  39         if (lock == NULL)
  40                 GOTO(out, rc = -ENOMEM);
  41
  42         LDLM_DEBUG(lock, "client-side enqueue START");
  43
  44         if (req == NULL) {
  45                 req = ptlrpc_prep_req(cl, conn, LDLM_ENQUEUE, 1, &size, NULL);
  46                 if (!req)
  47                         GOTO(out, rc = -ENOMEM);
  48                 req_passed_in = 0;
  49         } else if (req->rq_reqmsg->buflens[0] != sizeof(*body))
  50                 LBUG();
  51
  52         /* Dump all of this data into the request buffer */
  53         body = lustre_msg_buf(req->rq_reqmsg, 0);
  54         body->lock_desc.l_resource.lr_type = type;
  55         memcpy(body->lock_desc.l_resource.lr_name, res_id,
  56                sizeof(body->lock_desc.l_resource.lr_name));
  57
  58         body->lock_desc.l_req_mode = mode;
  59         if (type == LDLM_EXTENT)
  60                 memcpy(&body->lock_desc.l_extent, cookie,
  61                        sizeof(body->lock_desc.l_extent));
  62         body->lock_flags = *flags;
  63
  64         ldlm_lock2handle(lock, &body->lock_handle1);
  65         if (parent_lock_handle)
  66                 memcpy(&body->lock_handle2, parent_lock_handle,
  67                        sizeof(body->lock_handle2));
  68
  69         /* Continue as normal. */
  70         if (!req_passed_in) {
  71                 size = sizeof(*reply);
  72                 req->rq_replen = lustre_msg_size(1, &size);
  73         }
  74
  75         lock->l_connection = conn;
  76         lock->l_client = cl;
  77
  78         rc = ptlrpc_queue_wait(req);
  79         rc = ptlrpc_check_status(req, rc);
  80
  81         if (rc != ELDLM_OK) {
  82                 LDLM_DEBUG(lock, "client-side enqueue END (%s)",
  83                            rc == ELDLM_LOCK_ABORTED ? "ABORTED" : "FAILED");
  84                 ldlm_lock_put(lock);
  85                 GOTO(out, rc);
  86         }
  87
  88         reply = lustre_msg_buf(req->rq_repmsg, 0);
  89         memcpy(&lock->l_remote_handle, &reply->lock_handle,
  90                sizeof(lock->l_remote_handle));
  91         if (type == LDLM_EXTENT)
  92                 memcpy(cookie, &reply->lock_extent, sizeof(reply->lock_extent));
  93         *flags = reply->lock_flags;
  94
  95         CDEBUG(D_INFO, "remote handle: %p, flags: %d\n",
  96                (void *)(unsigned long)reply->lock_handle.addr, *flags);
  97         CDEBUG(D_INFO, "extent: %Lu -> %Lu\n",
  98                (unsigned long long)reply->lock_extent.start,
  99                (unsigned long long)reply->lock_extent.end);
 100
 101         /* If enqueue returned a blocked lock but the completion handler has
 102          * already run, then it fixed up the resource and we don't need to do it
 103          * again. */
 104         if (*flags & LDLM_FL_LOCK_CHANGED &&
 105             lock->l_req_mode != lock->l_granted_mode) {
 106                 CDEBUG(D_INFO, "remote intent success, locking %ld instead of"
 107                        "%ld\n", (long)reply->lock_resource_name[0],
 108                        (long)lock->l_resource->lr_name[0]);
 109
 110                 ldlm_lock_change_resource(lock, reply->lock_resource_name);
 111                 if (lock->l_resource == NULL) {
 112                         LBUG();
 113                         RETURN(-ENOMEM);
 114                 }
 115                 LDLM_DEBUG(lock, "client-side enqueue, new resource");
 116         }
 117
 118         if (!req_passed_in)
 119                 ptlrpc_free_req(req);
 120
 121         rc = ldlm_lock_enqueue(lock, cookie, cookielen, flags, callback,
 122                                      callback);
 123
 124         LDLM_DEBUG(lock, "client-side enqueue END");
 125         if (*flags & (LDLM_FL_BLOCK_WAIT | LDLM_FL_BLOCK_GRANTED |
 126                       LDLM_FL_BLOCK_CONV)) {
 127                 /* Go to sleep until the lock is granted. */
 128                 /* FIXME: or cancelled. */
 129                 CDEBUG(D_NET, "enqueue returned a blocked lock (%p), "
 130                        "going to sleep.\n", lock);
 131                 ldlm_lock_dump(lock);
 132                 wait_event_interruptible(lock->l_waitq, lock->l_req_mode ==
 133                                          lock->l_granted_mode);
 134                 CDEBUG(D_NET, "waking up, the lock must be granted.\n");
 135         }
 136         ldlm_lock_put(lock);
 137         EXIT;
 138  out:
 139         return rc;
 140 }
 141
 142 int ldlm_cli_callback(struct lustre_handle *lockh, struct ldlm_lock_desc *desc,
 143                       void *data, __u32 data_len, struct ptlrpc_request **reqp)
 144 {
 145         struct ldlm_lock *lock;
 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         lock = ldlm_handle2lock(lockh);
 154         if (lock == NULL)
 155                 LBUG();
 156
 157         req = ptlrpc_prep_req(cl, lock->l_connection, LDLM_CALLBACK, 1,
 158                               &size, NULL);
 159         if (!req)
 160                 GOTO(out, rc = -ENOMEM);
 161
 162         body = lustre_msg_buf(req->rq_reqmsg, 0);
 163         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 164                sizeof(body->lock_handle1));
 165
 166         if (desc == NULL) {
 167                 CDEBUG(D_NET, "Sending granted AST\n");
 168                 ldlm_lock2desc(lock, &body->lock_desc);
 169         } else {
 170                 CDEBUG(D_NET, "Sending blocked AST\n");
 171                 memcpy(&body->lock_desc, desc, sizeof(*desc));
 172         }
 173
 174         LDLM_DEBUG(lock, "server preparing %s AST",
 175                    desc->l_req_mode == 0 ? "completion" : "blocked");
 176
 177         req->rq_replen = lustre_msg_size(0, NULL);
 178
 179         if (reqp == NULL) {
 180                 LBUG();
 181                 rc = ptlrpc_queue_wait(req);
 182                 rc = ptlrpc_check_status(req, rc);
 183                 ptlrpc_free_req(req);
 184         } else
 185                 *reqp = req;
 186
 187
 188         EXIT;
 189  out:
 190         ldlm_lock_put(lock);
 191         return rc;
 192 }
 193
 194 int ldlm_cli_convert(struct ptlrpc_client *cl, struct lustre_handle *lockh,
 195                      int new_mode, int *flags)
 196 {
 197         struct ldlm_request *body;
 198         struct ldlm_reply *reply;
 199         struct ldlm_lock *lock;
 200         struct ldlm_resource *res;
 201         struct ptlrpc_request *req;
 202         int rc, size = sizeof(*body);
 203         ENTRY;
 204
 205         lock = ldlm_handle2lock(lockh);
 206         if (!lock)
 207                 LBUG();
 208         *flags = 0;
 209
 210         LDLM_DEBUG(lock, "client-side convert");
 211
 212         req = ptlrpc_prep_req(cl, lock->l_connection, LDLM_CONVERT, 1, &size,
 213                               NULL);
 214         if (!req)
 215                 GOTO(out, rc = -ENOMEM);
 216
 217         body = lustre_msg_buf(req->rq_reqmsg, 0);
 218         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 219                sizeof(body->lock_handle1));
 220
 221         body->lock_desc.l_req_mode = new_mode;
 222         body->lock_flags = *flags;
 223
 224         size = sizeof(*reply);
 225         req->rq_replen = lustre_msg_size(1, &size);
 226
 227         rc = ptlrpc_queue_wait(req);
 228         rc = ptlrpc_check_status(req, rc);
 229         if (rc != ELDLM_OK)
 230                 GOTO(out, rc);
 231
 232         reply = lustre_msg_buf(req->rq_repmsg, 0);
 233         res = ldlm_lock_convert(lock, new_mode, &reply->lock_flags);
 234         if (res != NULL)
 235                 ldlm_reprocess_all(res);
 236         if (lock->l_req_mode != lock->l_granted_mode) {
 237                 /* Go to sleep until the lock is granted. */
 238                 /* FIXME: or cancelled. */
 239                 CDEBUG(D_NET, "convert returned a blocked lock, "
 240                        "going to sleep.\n");
 241                 wait_event_interruptible(lock->l_waitq, lock->l_req_mode ==
 242                                          lock->l_granted_mode);
 243                 CDEBUG(D_NET, "waking up, the lock must be granted.\n");
 244         }
 245         ldlm_lock_put(lock);
 246         EXIT;
 247  out:
 248         ptlrpc_free_req(req);
 249         return rc;
 250 }
 251
 252 int ldlm_cli_cancel(struct lustre_handle *lockh)
 253 {
 254         struct ptlrpc_request *req;
 255         struct ldlm_lock *lock;
 256         struct ldlm_request *body;
 257         struct ldlm_resource *res;
 258         int rc, size = sizeof(*body);
 259         ENTRY;
 260
 261         lock = ldlm_handle2lock(lockh);
 262         if (!lock)
 263                 LBUG();
 264
 265         LDLM_DEBUG(lock, "client-side cancel");
 266         req = ptlrpc_prep_req(lock->l_client, lock->l_connection, LDLM_CANCEL,
 267                               1, &size, NULL);
 268         if (!req)
 269                 GOTO(out, rc = -ENOMEM);
 270
 271         body = lustre_msg_buf(req->rq_reqmsg, 0);
 272         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 273                sizeof(body->lock_handle1));
 274
 275         req->rq_replen = lustre_msg_size(0, NULL);
 276
 277         rc = ptlrpc_queue_wait(req);
 278         rc = ptlrpc_check_status(req, rc);
 279         ptlrpc_free_req(req);
 280         if (rc != ELDLM_OK)
 281                 GOTO(out, rc);
 282
 283         ldlm_lock_cancel(lock);
 284         ldlm_reprocess_all(res);
 285         ldlm_lock_put(lock);
 286         EXIT;
 287  out:
 288         return 0;
 289 }