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 ldlm_lock *lock, struct ldlm_lock_desc *desc,
 143                       void *data, __u32 data_len, struct ptlrpc_request **reqp)
 144 {
 145         struct ldlm_request *body;
 146         struct ptlrpc_request *req;
 147         struct ptlrpc_client *cl =
 148                 &lock->l_resource->lr_namespace->ns_rpc_client;
 149         int rc = 0, size = sizeof(*body);
 150         ENTRY;
 151
 152         req = ptlrpc_prep_req(cl, lock->l_connection, LDLM_CALLBACK, 1,
 153                               &size, NULL);
 154         if (!req)
 155                 GOTO(out, rc = -ENOMEM);
 156
 157         body = lustre_msg_buf(req->rq_reqmsg, 0);
 158         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 159                sizeof(body->lock_handle1));
 160
 161         if (desc == NULL) {
 162                 CDEBUG(D_NET, "Sending granted AST\n");
 163                 ldlm_lock2desc(lock, &body->lock_desc);
 164         } else {
 165                 CDEBUG(D_NET, "Sending blocked AST\n");
 166                 memcpy(&body->lock_desc, desc, sizeof(*desc));
 167         }
 168
 169         LDLM_DEBUG(lock, "server preparing %s AST",
 170                    desc->l_req_mode = 0 ? "completion" : "blocked");
 171
 172         req->rq_replen = lustre_msg_size(0, NULL);
 173
 174         if (reqp == NULL) {
 175                 LBUG();
 176                 rc = ptlrpc_queue_wait(req);
 177                 rc = ptlrpc_check_status(req, rc);
 178                 ptlrpc_free_req(req);
 179         } else
 180                 *reqp = req;
 181
 182         EXIT;
 183  out:
 184         return rc;
 185 }
 186
 187 int ldlm_cli_convert(struct ptlrpc_client *cl, struct lustre_handle *lockh,
 188                      int new_mode, int *flags)
 189 {
 190         struct ldlm_request *body;
 191         struct ldlm_reply *reply;
 192         struct ldlm_lock *lock;
 193         struct ldlm_resource *res;
 194         struct ptlrpc_request *req;
 195         int rc, size = sizeof(*body);
 196         ENTRY;
 197
 198         lock = ldlm_handle2lock(lockh);
 199         if (!lock)
 200                 LBUG();
 201         *flags = 0;
 202
 203         LDLM_DEBUG(lock, "client-side convert");
 204
 205         req = ptlrpc_prep_req(cl, lock->l_connection, LDLM_CONVERT, 1, &size,
 206                               NULL);
 207         if (!req)
 208                 GOTO(out, rc = -ENOMEM);
 209
 210         body = lustre_msg_buf(req->rq_reqmsg, 0);
 211         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 212                sizeof(body->lock_handle1));
 213
 214         body->lock_desc.l_req_mode = new_mode;
 215         body->lock_flags = *flags;
 216
 217         size = sizeof(*reply);
 218         req->rq_replen = lustre_msg_size(1, &size);
 219
 220         rc = ptlrpc_queue_wait(req);
 221         rc = ptlrpc_check_status(req, rc);
 222         if (rc != ELDLM_OK)
 223                 GOTO(out, rc);
 224
 225         reply = lustre_msg_buf(req->rq_repmsg, 0);
 226         res = ldlm_lock_convert(lock, new_mode, &reply->lock_flags);
 227         if (res != NULL)
 228                 ldlm_reprocess_all(res);
 229         if (lock->l_req_mode != lock->l_granted_mode) {
 230                 /* Go to sleep until the lock is granted. */
 231                 /* FIXME: or cancelled. */
 232                 CDEBUG(D_NET, "convert returned a blocked lock, "
 233                        "going to sleep.\n");
 234                 wait_event_interruptible(lock->l_waitq, lock->l_req_mode ==
 235                                          lock->l_granted_mode);
 236                 CDEBUG(D_NET, "waking up, the lock must be granted.\n");
 237         }
 238         ldlm_lock_put(lock);
 239         EXIT;
 240  out:
 241         ptlrpc_free_req(req);
 242         return rc;
 243 }
 244
 245 int ldlm_cli_cancel(struct ptlrpc_client *cl, struct lustre_handle *lockh)
 246 {
 247         struct ptlrpc_request *req;
 248         struct ldlm_lock *lock;
 249         struct ldlm_request *body;
 250         struct ldlm_resource *res;
 251         int rc, size = sizeof(*body);
 252         ENTRY;
 253
 254         lock = ldlm_handle2lock(lockh);
 255         if (!lock)
 256                 LBUG();
 257
 258         LDLM_DEBUG(lock, "client-side cancel");
 259         req = ptlrpc_prep_req(cl, lock->l_connection, LDLM_CANCEL, 1, &size,
 260                               NULL);
 261         if (!req)
 262                 GOTO(out, rc = -ENOMEM);
 263
 264         body = lustre_msg_buf(req->rq_reqmsg, 0);
 265         memcpy(&body->lock_handle1, &lock->l_remote_handle,
 266                sizeof(body->lock_handle1));
 267
 268         req->rq_replen = lustre_msg_size(0, NULL);
 269
 270         rc = ptlrpc_queue_wait(req);
 271         rc = ptlrpc_check_status(req, rc);
 272         ptlrpc_free_req(req);
 273         if (rc != ELDLM_OK)
 274                 GOTO(out, rc);
 275
 276         ldlm_lock_cancel(lock);
 277         ldlm_reprocess_all(res);
 278         ldlm_lock_put(lock);
 279         EXIT;
 280  out:
 281         return 0;
 282 }