adding single location for no_forcestart configuration list
[oweals/gnunet.git] / src / fs / gnunet-service-fs_pr.c
index 953983d37ace3647ce47405e61a7b48f23f7b8a6..a9530f53a3ce0a8c83f978b42522e646e024b987 100644 (file)
@@ -1,6 +1,6 @@
 /*
      This file is part of GNUnet.
-     (C) 2009, 2010, 2011 Christian Grothoff (and other contributing authors)
+     (C) 2009-2013 Christian Grothoff (and other contributing authors)
 
      GNUnet is free software; you can redistribute it and/or modify
      it under the terms of the GNU General Public License as published
  * @author Christian Grothoff
  */
 #include "platform.h"
+#include "gnunet_util_lib.h"
 #include "gnunet_load_lib.h"
 #include "gnunet-service-fs.h"
 #include "gnunet-service-fs_cp.h"
 #include "gnunet-service-fs_indexing.h"
 #include "gnunet-service-fs_pe.h"
 #include "gnunet-service-fs_pr.h"
+#include "gnunet-service-fs_cadet.h"
+
+
+/**
+ * Desired replication level for GETs.
+ */
+#define DHT_GET_REPLICATION 5
+
+/**
+ * Maximum size of the datastore queue for P2P operations.  Needs to
+ * be large enough to queue MAX_QUEUE_PER_PEER operations for roughly
+ * the number of active (connected) peers.
+ */
+#define MAX_DATASTORE_QUEUE (16 * MAX_QUEUE_PER_PEER)
+
+/**
+ * Bandwidth value of a 0-priority content (must be fairly high
+ * compared to query since content is typically significantly larger
+ * -- and more valueable since it can take many queries to get one
+ * piece of content).
+ */
+#define CONTENT_BANDWIDTH_VALUE 800
 
 /**
  * Hard limit on the number of results we may get from the datastore per query.
  */
 #define MAX_RESULTS (100 * 1024)
 
+/**
+ * Collect an instane number of statistics?  May cause excessive IPC.
+ */
+#define INSANE_STATISTICS GNUNET_NO
+
+/**
+ * If obtaining a block via cadet fails, how often do we retry it before
+ * giving up for good (and sticking to non-anonymous transfer)?
+ */
+#define CADET_RETRY_MAX 3
+
+
 /**
  * An active request.
  */
@@ -52,14 +87,14 @@ struct GSF_PendingRequest
   GSF_PendingRequestReplyHandler rh;
 
   /**
-   * Closure for 'rh'
+   * Closure for @e rh
    */
   void *rh_cls;
 
   /**
    * Array of hash codes of replies we've already seen.
    */
-  GNUNET_HashCode *replies_seen;
+  struct GNUNET_HashCode *replies_seen;
 
   /**
    * Bloomfilter masking replies we've already seen.
@@ -81,6 +116,11 @@ struct GSF_PendingRequest
    */
   struct GNUNET_DHT_GetHandle *gh;
 
+  /**
+   * Cadet request handle for this request (or NULL for none).
+   */
+  struct GSF_CadetRequest *cadet_request;
+
   /**
    * Function to call upon completion of the local get
    * request, or NULL for none.
@@ -88,7 +128,7 @@ struct GSF_PendingRequest
   GSF_LocalLookupContinuation llc_cont;
 
   /**
-   * Closure for llc_cont.
+   * Closure for @e llc_cont.
    */
   void *llc_cont_cls;
 
@@ -103,6 +143,12 @@ struct GSF_PendingRequest
    */
   GNUNET_PEER_Id sender_pid;
 
+  /**
+   * Identity of the peer that we should never forward this query
+   * to since it originated this query (0 for none).
+   */
+  GNUNET_PEER_Id origin_pid;
+
   /**
    * Time we started the last datastore lookup.
    */
@@ -127,6 +173,12 @@ struct GSF_PendingRequest
    */
   uint64_t first_uid;
 
+  /**
+   * How often have we retried this request via 'cadet'?
+   * (used to bound overall retries).
+   */
+  unsigned int cadet_retry_count;
+
   /**
    * Number of valid entries in the 'replies_seen' array.
    */
@@ -204,10 +256,10 @@ refresh_bloomfilter (struct GSF_PendingRequest *pr)
   if (pr->bf != NULL)
     GNUNET_CONTAINER_bloomfilter_free (pr->bf);
   pr->mingle =
-    GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, UINT32_MAX);
-  pr->bf = GNUNET_BLOCK_construct_bloomfilter (pr->mingle,
-                                              pr->replies_seen,
-                                              pr->replies_seen_count);
+      GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, UINT32_MAX);
+  pr->bf =
+      GNUNET_BLOCK_construct_bloomfilter (pr->mingle, pr->replies_seen,
+                                          pr->replies_seen_count);
 }
 
 
@@ -217,59 +269,60 @@ refresh_bloomfilter (struct GSF_PendingRequest *pr)
  * @param options request options
  * @param type type of the block that is being requested
  * @param query key for the lookup
- * @param namespace namespace to lookup, NULL for no namespace
  * @param target preferred target for the request, NULL for none
  * @param bf_data raw data for bloom filter for known replies, can be NULL
- * @param bf_size number of bytes in bf_data
+ * @param bf_size number of bytes in @a bf_data
  * @param mingle mingle value for bf
  * @param anonymity_level desired anonymity level
  * @param priority maximum outgoing cummulative request priority to use
  * @param ttl current time-to-live for the request
  * @param sender_pid peer ID to use for the sender when forwarding, 0 for none
+ * @param origin_pid peer ID of origin of query (do not loop back)
  * @param replies_seen hash codes of known local replies
- * @param replies_seen_count size of the 'replies_seen' array
+ * @param replies_seen_count size of the @a replies_seen array
  * @param rh handle to call when we get a reply
- * @param rh_cls closure for rh
+ * @param rh_cls closure for @a rh
  * @return handle for the new pending request
  */
 struct GSF_PendingRequest *
 GSF_pending_request_create_ (enum GSF_PendingRequestOptions options,
                              enum GNUNET_BLOCK_Type type,
-                             const GNUNET_HashCode * query,
-                             const GNUNET_HashCode * namespace,
+                             const struct GNUNET_HashCode *query,
                              const struct GNUNET_PeerIdentity *target,
                              const char *bf_data, size_t bf_size,
                              uint32_t mingle, uint32_t anonymity_level,
                              uint32_t priority, int32_t ttl,
                              GNUNET_PEER_Id sender_pid,
-                             const GNUNET_HashCode * replies_seen,
+                             GNUNET_PEER_Id origin_pid,
+                             const struct GNUNET_HashCode *replies_seen,
                              unsigned int replies_seen_count,
                              GSF_PendingRequestReplyHandler rh, void *rh_cls)
 {
   struct GSF_PendingRequest *pr;
   struct GSF_PendingRequest *dpr;
+  size_t extra;
+  struct GNUNET_HashCode *eptr;
 
-#if DEBUG_FS
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "Creating request handle for `%s' of type %d\n",
               GNUNET_h2s (query), type);
-#endif
+#if INSANE_STATISTICS
   GNUNET_STATISTICS_update (GSF_stats,
                             gettext_noop ("# Pending requests created"), 1,
                             GNUNET_NO);
-  pr = GNUNET_malloc (sizeof (struct GSF_PendingRequest));
+#endif
+  extra = 0;
+  if (NULL != target)
+    extra += sizeof (struct GNUNET_PeerIdentity);
+  pr = GNUNET_malloc (sizeof (struct GSF_PendingRequest) + extra);
   pr->local_result_offset =
       GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK, UINT64_MAX);
   pr->public_data.query = *query;
-  if (GNUNET_BLOCK_TYPE_FS_SBLOCK == type)
-  {
-    GNUNET_assert (NULL != namespace);
-    pr->public_data.namespace = *namespace;
-  }
+  eptr = (struct GNUNET_HashCode *) &pr[1];
   if (NULL != target)
   {
-    pr->public_data.target = *target;
-    pr->public_data.has_target = GNUNET_YES;
+    pr->public_data.target = (struct GNUNET_PeerIdentity *) eptr;
+    memcpy (eptr, target, sizeof (struct GNUNET_PeerIdentity));
   }
   pr->public_data.anonymity_level = anonymity_level;
   pr->public_data.priority = priority;
@@ -278,6 +331,7 @@ GSF_pending_request_create_ (enum GSF_PendingRequestOptions options,
   pr->public_data.type = type;
   pr->public_data.start_time = GNUNET_TIME_absolute_get ();
   pr->sender_pid = sender_pid;
+  pr->origin_pid = origin_pid;
   pr->rh = rh;
   pr->rh_cls = rh_cls;
   GNUNET_assert ((sender_pid != 0) || (0 == (options & GSF_PRO_FORWARD_ONLY)));
@@ -296,15 +350,16 @@ GSF_pending_request_create_ (enum GSF_PendingRequestOptions options,
   {
     pr->replies_seen_size = replies_seen_count;
     pr->replies_seen =
-        GNUNET_malloc (sizeof (GNUNET_HashCode) * pr->replies_seen_size);
+        GNUNET_malloc (sizeof (struct GNUNET_HashCode) * pr->replies_seen_size);
     memcpy (pr->replies_seen, replies_seen,
-            replies_seen_count * sizeof (GNUNET_HashCode));
+            replies_seen_count * sizeof (struct GNUNET_HashCode));
     pr->replies_seen_count = replies_seen_count;
   }
   if (NULL != bf_data)
   {
     pr->bf =
-        GNUNET_CONTAINER_bloomfilter_init (bf_data, bf_size, GNUNET_CONSTANTS_BLOOMFILTER_K);
+        GNUNET_CONTAINER_bloomfilter_init (bf_data, bf_size,
+                                           GNUNET_CONSTANTS_BLOOMFILTER_K);
     pr->mingle = mingle;
   }
   else if ((replies_seen_count > 0) &&
@@ -312,13 +367,14 @@ GSF_pending_request_create_ (enum GSF_PendingRequestOptions options,
   {
     refresh_bloomfilter (pr);
   }
-  GNUNET_CONTAINER_multihashmap_put (pr_map, query, pr,
+  GNUNET_CONTAINER_multihashmap_put (pr_map,
+                                    &pr->public_data.query, pr,
                                      GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
-  if (0 != (options & GSF_PRO_REQUEST_EXPIRES))
+  if (0 == (options & GSF_PRO_REQUEST_NEVER_EXPIRES))
   {
     pr->hnode =
         GNUNET_CONTAINER_heap_insert (requests_by_expiration_heap, pr,
-                                      pr->public_data.ttl.abs_value);
+                                      pr->public_data.ttl.abs_value_us);
     /* make sure we don't track too many requests */
     while (GNUNET_CONTAINER_heap_get_size (requests_by_expiration_heap) >
            max_pending_requests)
@@ -327,9 +383,10 @@ GSF_pending_request_create_ (enum GSF_PendingRequestOptions options,
       GNUNET_assert (dpr != NULL);
       if (pr == dpr)
         break;                  /* let the request live briefly... */
-      dpr->rh (dpr->rh_cls, GNUNET_BLOCK_EVALUATION_REQUEST_VALID, dpr,
-               UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_ABS, GNUNET_BLOCK_TYPE_ANY,
-               NULL, 0);
+      if (NULL != dpr->rh)
+       dpr->rh (dpr->rh_cls, GNUNET_BLOCK_EVALUATION_REQUEST_VALID, dpr,
+                UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_ABS, GNUNET_TIME_UNIT_FOREVER_ABS,
+                 GNUNET_BLOCK_TYPE_ANY, NULL, 0);
       GSF_pending_request_cancel_ (dpr, GNUNET_YES);
     }
   }
@@ -339,7 +396,6 @@ GSF_pending_request_create_ (enum GSF_PendingRequestOptions options,
   return pr;
 }
 
-
 /**
  * Obtain the public data associated with a pending request
  *
@@ -360,7 +416,7 @@ GSF_pending_request_get_data_ (struct GSF_PendingRequest *pr)
  *
  * @param pra a pending request
  * @param prb another pending request
- * @return GNUNET_OK if the requests are compatible
+ * @return #GNUNET_OK if the requests are compatible
  */
 int
 GSF_pending_request_is_compatible_ (struct GSF_PendingRequest *pra,
@@ -369,11 +425,7 @@ GSF_pending_request_is_compatible_ (struct GSF_PendingRequest *pra,
   if ((pra->public_data.type != prb->public_data.type) ||
       (0 !=
        memcmp (&pra->public_data.query, &prb->public_data.query,
-               sizeof (GNUNET_HashCode))) ||
-      ((pra->public_data.type == GNUNET_BLOCK_TYPE_FS_SBLOCK) &&
-       (0 !=
-        memcmp (&pra->public_data.namespace, &prb->public_data.namespace,
-                sizeof (GNUNET_HashCode)))))
+               sizeof (struct GNUNET_HashCode))))
     return GNUNET_NO;
   return GNUNET_OK;
 }
@@ -390,11 +442,11 @@ GSF_pending_request_is_compatible_ (struct GSF_PendingRequest *pra,
  */
 void
 GSF_pending_request_update_ (struct GSF_PendingRequest *pr,
-                             const GNUNET_HashCode * replies_seen,
+                             const struct GNUNET_HashCode * replies_seen,
                              unsigned int replies_seen_count)
 {
   unsigned int i;
-  GNUNET_HashCode mhash;
+  struct GNUNET_HashCode mhash;
 
   if (replies_seen_count + pr->replies_seen_count < pr->replies_seen_count)
     return;                     /* integer overflow */
@@ -405,7 +457,7 @@ GSF_pending_request_update_ (struct GSF_PendingRequest *pr,
       GNUNET_array_grow (pr->replies_seen, pr->replies_seen_size,
                          replies_seen_count + pr->replies_seen_count);
     memcpy (&pr->replies_seen[pr->replies_seen_count], replies_seen,
-            sizeof (GNUNET_HashCode) * replies_seen_count);
+            sizeof (struct GNUNET_HashCode) * replies_seen_count);
     pr->replies_seen_count += replies_seen_count;
     refresh_bloomfilter (pr);
   }
@@ -418,19 +470,22 @@ GSF_pending_request_update_ (struct GSF_PendingRequest *pr,
       pr->mingle =
           GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, UINT32_MAX);
       pr->bf =
-       GNUNET_BLOCK_construct_bloomfilter (pr->mingle,
-                                           replies_seen,
-                                           replies_seen_count);
-    } 
+          GNUNET_BLOCK_construct_bloomfilter (pr->mingle, replies_seen,
+                                              replies_seen_count);
+    }
     else
     {
       for (i = 0; i < pr->replies_seen_count; i++)
-       {
-         GNUNET_BLOCK_mingle_hash (&replies_seen[i], pr->mingle, &mhash);
-         GNUNET_CONTAINER_bloomfilter_add (pr->bf, &mhash);
-       }
+      {
+        GNUNET_BLOCK_mingle_hash (&replies_seen[i], pr->mingle, &mhash);
+        GNUNET_CONTAINER_bloomfilter_add (pr->bf, &mhash);
+      }
     }
   }
+  if (NULL != pr->gh)
+    GNUNET_DHT_get_filter_known_results (pr->gh,
+                                        replies_seen_count,
+                                        replies_seen);
 }
 
 
@@ -439,9 +494,9 @@ GSF_pending_request_update_ (struct GSF_PendingRequest *pr,
  * transmission to other peers (or at least determine its size).
  *
  * @param pr request to generate the message for
- * @param buf_size number of bytes available in buf
+ * @param buf_size number of bytes available in @a buf
  * @param buf where to copy the message (can be NULL)
- * @return number of bytes needed (if > buf_size) or used
+ * @return number of bytes needed (if `>` @a buf_size) or used
  */
 size_t
 GSF_pending_request_get_message_ (struct GSF_PendingRequest *pr,
@@ -449,7 +504,7 @@ GSF_pending_request_get_message_ (struct GSF_PendingRequest *pr,
 {
   char lbuf[GNUNET_SERVER_MAX_MESSAGE_SIZE];
   struct GetMessage *gm;
-  GNUNET_HashCode *ext;
+  struct GNUNET_PeerIdentity *ext;
   size_t msize;
   unsigned int k;
   uint32_t bm;
@@ -459,12 +514,10 @@ GSF_pending_request_get_message_ (struct GSF_PendingRequest *pr,
   int64_t ttl;
   int do_route;
 
-#if DEBUG_FS
   if (buf_size > 0)
     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                 "Building request message for `%s' of type %d\n",
                 GNUNET_h2s (&pr->public_data.query), pr->public_data.type);
-#endif
   k = 0;
   bm = 0;
   do_route = (0 == (pr->public_data.options & GSF_PRO_FORWARD_ONLY));
@@ -478,18 +531,13 @@ GSF_pending_request_get_message_ (struct GSF_PendingRequest *pr,
     bm |= GET_MESSAGE_BIT_RETURN_TO;
     k++;
   }
-  if (GNUNET_BLOCK_TYPE_FS_SBLOCK == pr->public_data.type)
-  {
-    bm |= GET_MESSAGE_BIT_SKS_NAMESPACE;
-    k++;
-  }
-  if (GNUNET_YES == pr->public_data.has_target)
+  if (NULL != pr->public_data.target)
   {
     bm |= GET_MESSAGE_BIT_TRANSMIT_TO;
     k++;
   }
   bf_size = GNUNET_CONTAINER_bloomfilter_get_size (pr->bf);
-  msize = sizeof (struct GetMessage) + bf_size + k * sizeof (GNUNET_HashCode);
+  msize = sizeof (struct GetMessage) + bf_size + k * sizeof (struct GNUNET_PeerIdentity);
   GNUNET_assert (msize < GNUNET_SERVER_MAX_MESSAGE_SIZE);
   if (buf_size < msize)
     return msize;
@@ -504,23 +552,23 @@ GSF_pending_request_get_message_ (struct GSF_PendingRequest *pr,
   else
     prio = 0;
   pr->public_data.priority -= prio;
+  pr->public_data.num_transmissions++;
+  pr->public_data.respect_offered += prio;
   gm->priority = htonl (prio);
   now = GNUNET_TIME_absolute_get ();
-  ttl = (int64_t) (pr->public_data.ttl.abs_value - now.abs_value);
-  gm->ttl = htonl (ttl / 1000);
+  ttl = (int64_t) (pr->public_data.ttl.abs_value_us - now.abs_value_us);
+  gm->ttl = htonl (ttl / 1000LL / 1000LL);
   gm->filter_mutator = htonl (pr->mingle);
   gm->hash_bitmap = htonl (bm);
   gm->query = pr->public_data.query;
-  ext = (GNUNET_HashCode *) & gm[1];
+  ext = (struct GNUNET_PeerIdentity *) &gm[1];
   k = 0;
   if (!do_route)
     GNUNET_PEER_resolve (pr->sender_pid,
-                         (struct GNUNET_PeerIdentity *) &ext[k++]);
-  if (GNUNET_BLOCK_TYPE_FS_SBLOCK == pr->public_data.type)
-    memcpy (&ext[k++], &pr->public_data.namespace, sizeof (GNUNET_HashCode));
-  if (GNUNET_YES == pr->public_data.has_target)
-    ext[k++] = pr->public_data.target.hashPubKey;
-  if (pr->bf != NULL)
+                         &ext[k++]);
+  if (NULL != pr->public_data.target)
+    ext[k++] = *pr->public_data.target;
+  if (NULL != pr->bf)
     GNUNET_assert (GNUNET_SYSERR !=
                    GNUNET_CONTAINER_bloomfilter_get_raw_data (pr->bf,
                                                               (char *) &ext[k],
@@ -536,18 +584,23 @@ GSF_pending_request_get_message_ (struct GSF_PendingRequest *pr,
  * @param cls closure, unused
  * @param key current key code
  * @param value value in the hash map (pending request)
- * @return GNUNET_YES (we should continue to iterate)
+ * @return #GNUNET_YES (we should continue to iterate)
  */
 static int
-clean_request (void *cls, const GNUNET_HashCode * key, void *value)
+clean_request (void *cls, const struct GNUNET_HashCode *key, void *value)
 {
   struct GSF_PendingRequest *pr = value;
   GSF_LocalLookupContinuation cont;
 
-#if DEBUG_FS
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
-              "Cleaning up pending request for `%s'.\n", GNUNET_h2s (key));
-#endif
+              "Cleaning up pending request for `%s'.\n",
+             GNUNET_h2s (key));
+  if (NULL != pr->cadet_request)
+  {
+    pr->cadet_retry_count = CADET_RETRY_MAX;
+    GSF_cadet_query_cancel (pr->cadet_request);
+    pr->cadet_request = NULL;
+  }
   if (NULL != (cont = pr->llc_cont))
   {
     pr->llc_cont = NULL;
@@ -562,6 +615,8 @@ clean_request (void *cls, const GNUNET_HashCode * key, void *value)
   }
   GNUNET_PEER_change_rc (pr->sender_pid, -1);
   pr->sender_pid = 0;
+  GNUNET_PEER_change_rc (pr->origin_pid, -1);
+  pr->origin_pid = 0;
   if (NULL != pr->hnode)
   {
     GNUNET_CONTAINER_heap_remove_node (pr->hnode);
@@ -613,6 +668,12 @@ GSF_pending_request_cancel_ (struct GSF_PendingRequest *pr, int full_cleanup)
      * but do NOT remove from our data-structures, we still need it there
      * to prevent the request from looping */
     pr->rh = NULL;
+    if (NULL != pr->cadet_request)
+    {
+      pr->cadet_retry_count = CADET_RETRY_MAX;
+      GSF_cadet_query_cancel (pr->cadet_request);
+      pr->cadet_request = NULL;
+    }
     if (NULL != (cont = pr->llc_cont))
     {
       pr->llc_cont = NULL;
@@ -656,10 +717,8 @@ GSF_iterate_pending_requests_ (GSF_PendingRequestIterator it, void *cls)
 }
 
 
-
-
 /**
- * Closure for "process_reply" function.
+ * Closure for process_reply() function.
  */
 struct ProcessReplyClosure
 {
@@ -734,31 +793,29 @@ update_request_performance_data (struct ProcessReplyClosure *prq,
  * @param cls response (struct ProcessReplyClosure)
  * @param key our query
  * @param value value in the hash map (info about the query)
- * @return GNUNET_YES (we should continue to iterate)
+ * @return #GNUNET_YES (we should continue to iterate)
  */
 static int
-process_reply (void *cls, const GNUNET_HashCode * key, void *value)
+process_reply (void *cls,
+               const struct GNUNET_HashCode *key,
+               void *value)
 {
   struct ProcessReplyClosure *prq = cls;
   struct GSF_PendingRequest *pr = value;
-  GNUNET_HashCode chash;
+  struct GNUNET_HashCode chash;
+  struct GNUNET_TIME_Absolute last_transmission;
 
   if (NULL == pr->rh)
     return GNUNET_YES;
-#if DEBUG_FS
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "Matched result (type %u) for query `%s' with pending request\n",
               (unsigned int) prq->type, GNUNET_h2s (key));
-#endif
   GNUNET_STATISTICS_update (GSF_stats,
                             gettext_noop ("# replies received and matched"), 1,
                             GNUNET_NO);
   prq->eval =
       GNUNET_BLOCK_evaluate (GSF_block_ctx, prq->type, key, &pr->bf, pr->mingle,
-                             &pr->public_data.namespace,
-                             (prq->type ==
-                              GNUNET_BLOCK_TYPE_FS_SBLOCK) ?
-                             sizeof (GNUNET_HashCode) : 0, prq->data,
+                             NULL, 0, prq->data,
                              prq->size);
   switch (prq->eval)
   {
@@ -770,21 +827,34 @@ process_reply (void *cls, const GNUNET_HashCode * key, void *value)
     update_request_performance_data (prq, pr);
     GNUNET_LOAD_update (GSF_rt_entry_lifetime,
                         GNUNET_TIME_absolute_get_duration (pr->
-                                                           public_data.start_time).rel_value);
+                                                           public_data.start_time).rel_value_us);
+    if (GNUNET_YES !=
+       GSF_request_plan_reference_get_last_transmission_ (pr->public_data.pr_head,
+                                                          prq->sender,
+                                                          &last_transmission))
+      last_transmission.abs_value_us = GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us;
     /* pass on to other peers / local clients */
     pr->rh (pr->rh_cls, prq->eval, pr, prq->anonymity_level, prq->expiration,
-            prq->type, prq->data, prq->size);
+            last_transmission, prq->type, prq->data, prq->size);
     return GNUNET_YES;
   case GNUNET_BLOCK_EVALUATION_OK_DUPLICATE:
+#if INSANE_STATISTICS
     GNUNET_STATISTICS_update (GSF_stats,
                               gettext_noop
                               ("# duplicate replies discarded (bloomfilter)"),
                               1, GNUNET_NO);
-#if DEBUG_FS && 0
-    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
-                "Duplicate response `%s', discarding.\n", GNUNET_h2s (&mhash));
 #endif
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                "Duplicate response, discarding.\n");
     return GNUNET_YES;          /* duplicate */
+  case GNUNET_BLOCK_EVALUATION_RESULT_IRRELEVANT:
+    GNUNET_STATISTICS_update (GSF_stats,
+                              gettext_noop
+                              ("# irrelevant replies discarded"),
+                              1, GNUNET_NO);
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                "Irrelevant response, ignoring.\n");
+    return GNUNET_YES;
   case GNUNET_BLOCK_EVALUATION_RESULT_INVALID:
     return GNUNET_YES;          /* wrong namespace */
   case GNUNET_BLOCK_EVALUATION_REQUEST_VALID:
@@ -803,11 +873,9 @@ process_reply (void *cls, const GNUNET_HashCode * key, void *value)
   GSF_pending_request_update_ (pr, &chash, 1);
   if (NULL == prq->sender)
   {
-#if DEBUG_FS
     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                 "Found result for query `%s' in local datastore\n",
                 GNUNET_h2s (key));
-#endif
     GNUNET_STATISTICS_update (GSF_stats,
                               gettext_noop ("# results found locally"), 1,
                               GNUNET_NO);
@@ -822,14 +890,19 @@ process_reply (void *cls, const GNUNET_HashCode * key, void *value)
   pr->public_data.results_found++;
   prq->request_found = GNUNET_YES;
   /* finally, pass on to other peer / local client */
-  pr->rh (pr->rh_cls, prq->eval, pr, prq->anonymity_level, prq->expiration,
-          prq->type, prq->data, prq->size);
+  if (! GSF_request_plan_reference_get_last_transmission_ (pr->public_data.pr_head,
+                                                          prq->sender,
+                                                          &last_transmission))
+    last_transmission.abs_value_us = GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us;
+  pr->rh (pr->rh_cls, prq->eval, pr,
+         prq->anonymity_level, prq->expiration,
+          last_transmission, prq->type, prq->data, prq->size);
   return GNUNET_YES;
 }
 
 
 /**
- * Context for the 'put_migration_continuation'.
+ * Context for put_migration_continuation().
  */
 struct PutMigrationContext
 {
@@ -857,49 +930,73 @@ struct PutMigrationContext
  * operation.
  *
  * @param cls closure
- * @param success GNUNET_SYSERR on failure
+ * @param success #GNUNET_SYSERR on failure
+ * @param min_expiration minimum expiration time required for content to be stored
  * @param msg NULL on success, otherwise an error message
  */
 static void
-put_migration_continuation (void *cls, int success, const char *msg)
+put_migration_continuation (void *cls, int success,
+                           struct GNUNET_TIME_Absolute min_expiration,
+                           const char *msg)
 {
   struct PutMigrationContext *pmc = cls;
-  struct GNUNET_TIME_Relative delay;
-  struct GNUNET_TIME_Relative block_time;
   struct GSF_ConnectedPeer *cp;
+  struct GNUNET_TIME_Relative mig_pause;
   struct GSF_PeerPerformanceData *ppd;
 
-  delay = GNUNET_TIME_absolute_get_duration (pmc->start);
+  if (NULL != datastore_put_load)
+  {
+    if (GNUNET_SYSERR != success)
+    {
+      GNUNET_LOAD_update (datastore_put_load,
+                         GNUNET_TIME_absolute_get_duration (pmc->start).rel_value_us);
+    }
+    else
+    {
+      /* on queue failure / timeout, increase the put load dramatically */
+      GNUNET_LOAD_update (datastore_put_load,
+                         GNUNET_TIME_UNIT_MINUTES.rel_value_us);
+    }
+  }
   cp = GSF_peer_get_ (&pmc->origin);
-  if ((GNUNET_OK != success) && (GNUNET_NO == pmc->requested))
+  if (GNUNET_OK == success)
   {
-    /* block migration for a bit... */
     if (NULL != cp)
     {
       ppd = GSF_get_peer_performance_data_ (cp);
-      ppd->migration_duplication++;
-      block_time =
-          GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
-                                         5 * ppd->migration_duplication +
-                                         GNUNET_CRYPTO_random_u32
-                                         (GNUNET_CRYPTO_QUALITY_WEAK, 5));
-      GSF_block_peer_migration_ (cp, block_time);
+      ppd->migration_delay.rel_value_us /= 2;
     }
+    GNUNET_free (pmc);
+    return;
   }
-  else
+  if ( (GNUNET_NO == success) &&
+       (GNUNET_NO == pmc->requested) &&
+       (NULL != cp) )
   {
-    if (NULL != cp)
+    ppd = GSF_get_peer_performance_data_ (cp);
+    if (min_expiration.abs_value_us > 0)
     {
-      ppd = GSF_get_peer_performance_data_ (cp);
-      ppd->migration_duplication = 0;   /* reset counter */
+      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                 "Asking to stop migration for %s because datastore is full\n",
+                 GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_remaining (min_expiration), GNUNET_YES));
+      GSF_block_peer_migration_ (cp, min_expiration);
+    }
+    else
+    {
+      ppd->migration_delay = GNUNET_TIME_relative_max (GNUNET_TIME_UNIT_SECONDS,
+                                                      ppd->migration_delay);
+      ppd->migration_delay = GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_HOURS,
+                                                      ppd->migration_delay);
+      mig_pause.rel_value_us = GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK,
+                                                        ppd->migration_delay.rel_value_us);
+      ppd->migration_delay = GNUNET_TIME_relative_multiply (ppd->migration_delay, 2);
+      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                 "Replicated content already exists locally, asking to stop migration for %s\n",
+                 GNUNET_STRINGS_relative_time_to_string (mig_pause, GNUNET_YES));
+      GSF_block_peer_migration_ (cp, GNUNET_TIME_relative_to_absolute (mig_pause));
     }
   }
   GNUNET_free (pmc);
-  /* FIXME: should we really update the load value on failure? */
-  if (NULL != datastore_put_load)
-    GNUNET_LOAD_update (datastore_put_load, delay.rel_value);
-  if (GNUNET_OK == success)
-    return;
   GNUNET_STATISTICS_update (GSF_stats,
                             gettext_noop ("# Datastore `PUT' failures"), 1,
                             GNUNET_NO);
@@ -911,8 +1008,9 @@ put_migration_continuation (void *cls, int success, const char *msg)
  * to even consider processing the query at
  * all.
  *
- * @return GNUNET_YES if the load is too high to do anything (load high)
- *         GNUNET_NO to process normally (load normal or low)
+ * @param priority the priority of the item
+ * @return #GNUNET_YES if the load is too high to do anything (load high)
+ *         #GNUNET_NO to process normally (load normal or low)
  */
 static int
 test_put_load_too_high (uint32_t priority)
@@ -942,21 +1040,21 @@ test_put_load_too_high (uint32_t priority)
  * @param exp when will this value expire
  * @param key key of the result
  * @param get_path peers on reply path (or NULL if not recorded)
- * @param get_path_length number of entries in get_path
+ * @param get_path_length number of entries in @a get_path
  * @param put_path peers on the PUT path (or NULL if not recorded)
- * @param put_path_length number of entries in get_path
+ * @param put_path_length number of entries in @a get_path
  * @param type type of the result
- * @param size number of bytes in data
+ * @param size number of bytes in @a data
  * @param data pointer to the result data
  */
 static void
 handle_dht_reply (void *cls, struct GNUNET_TIME_Absolute exp,
-                  const GNUNET_HashCode * key,
+                  const struct GNUNET_HashCode * key,
                   const struct GNUNET_PeerIdentity *get_path,
-                 unsigned int get_path_length,
+                  unsigned int get_path_length,
                   const struct GNUNET_PeerIdentity *put_path,
-                 unsigned int put_path_length,
-                  enum GNUNET_BLOCK_Type type, size_t size, const void *data)
+                  unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
+                  size_t size, const void *data)
 {
   struct GSF_PendingRequest *pr = cls;
   struct ProcessReplyClosure prq;
@@ -968,18 +1066,19 @@ handle_dht_reply (void *cls, struct GNUNET_TIME_Absolute exp,
   memset (&prq, 0, sizeof (prq));
   prq.data = data;
   prq.expiration = exp;
+  /* do not allow migrated content to live longer than 1 year */
+  prq.expiration = GNUNET_TIME_absolute_min (GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_YEARS),
+                                            prq.expiration);
   prq.size = size;
   prq.type = type;
   process_reply (&prq, key, pr);
   if ((GNUNET_YES == active_to_migration) &&
       (GNUNET_NO == test_put_load_too_high (prq.priority)))
   {
-#if DEBUG_FS
     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                 "Replicating result for query `%s' with priority %u\n",
                 GNUNET_h2s (key), prq.priority);
-#endif
-    pmc = GNUNET_malloc (sizeof (struct PutMigrationContext));
+    pmc = GNUNET_new (struct PutMigrationContext);
     pmc->start = GNUNET_TIME_absolute_get ();
     pmc->requested = GNUNET_YES;
     if (NULL ==
@@ -990,7 +1089,7 @@ handle_dht_reply (void *cls, struct GNUNET_TIME_Absolute exp,
                               GNUNET_CONSTANTS_SERVICE_TIMEOUT,
                               &put_migration_continuation, pmc))
     {
-      put_migration_continuation (pmc, GNUNET_NO, NULL);
+      put_migration_continuation (pmc, GNUNET_SYSERR, GNUNET_TIME_UNIT_ZERO_ABS, NULL);
     }
   }
 }
@@ -1007,7 +1106,7 @@ GSF_dht_lookup_ (struct GSF_PendingRequest *pr)
   const void *xquery;
   size_t xquery_size;
   struct GNUNET_PeerIdentity pi;
-  char buf[sizeof (GNUNET_HashCode) * 2];
+  char buf[sizeof (struct GNUNET_HashCode) * 2] GNUNET_ALIGN;
 
   if (0 != pr->public_data.anonymity_level)
     return;
@@ -1018,12 +1117,6 @@ GSF_dht_lookup_ (struct GSF_PendingRequest *pr)
   }
   xquery = NULL;
   xquery_size = 0;
-  if (GNUNET_BLOCK_TYPE_FS_SBLOCK == pr->public_data.type)
-  {
-    xquery = buf;
-    memcpy (buf, &pr->public_data.namespace, sizeof (GNUNET_HashCode));
-    xquery_size = sizeof (GNUNET_HashCode);
-  }
   if (0 != (pr->public_data.options & GSF_PRO_FORWARD_ONLY))
   {
     GNUNET_assert (0 != pr->sender_pid);
@@ -1032,13 +1125,107 @@ GSF_dht_lookup_ (struct GSF_PendingRequest *pr)
     xquery_size += sizeof (struct GNUNET_PeerIdentity);
   }
   pr->gh =
-      GNUNET_DHT_get_start (GSF_dht, GNUNET_TIME_UNIT_FOREVER_REL,
+      GNUNET_DHT_get_start (GSF_dht,
                             pr->public_data.type, &pr->public_data.query,
-                            5 /* DEFAULT_GET_REPLICATION */,
-                            GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, 
-                           /* FIXME: can no longer pass pr->bf/pr->mingle... */
-                            xquery, xquery_size, &handle_dht_reply,
-                            pr);
+                            DHT_GET_REPLICATION,
+                            GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
+                            xquery, xquery_size, &handle_dht_reply, pr);
+  if ( (NULL != pr->gh) &&
+       (0 != pr->replies_seen_count) )
+    GNUNET_DHT_get_filter_known_results (pr->gh,
+                                        pr->replies_seen_count,
+                                        pr->replies_seen);
+}
+
+
+/**
+ * Function called with a reply from the cadet.
+ *
+ * @param cls the pending request struct
+ * @param type type of the block, ANY on error
+ * @param expiration expiration time for the block
+ * @param data_size number of bytes in @a data, 0 on error
+ * @param data reply block data, NULL on error
+ */
+static void
+cadet_reply_proc (void *cls,
+                 enum GNUNET_BLOCK_Type type,
+                 struct GNUNET_TIME_Absolute expiration,
+                 size_t data_size,
+                 const void *data)
+{
+  struct GSF_PendingRequest *pr = cls;
+  struct ProcessReplyClosure prq;
+  struct GNUNET_HashCode query;
+
+  pr->cadet_request = NULL;
+  if (GNUNET_BLOCK_TYPE_ANY == type)
+  {
+    GNUNET_break (NULL == data);
+    GNUNET_break (0 == data_size);
+    pr->cadet_retry_count++;
+    if (pr->cadet_retry_count >= CADET_RETRY_MAX)
+      return; /* give up on cadet */
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+               "Error retrieiving block via cadet\n");
+    /* retry -- without delay, as this is non-anonymous
+       and cadet/cadet connect will take some time anyway */
+    pr->cadet_request = GSF_cadet_query (pr->public_data.target,
+                                       &pr->public_data.query,
+                                       pr->public_data.type,
+                                       &cadet_reply_proc,
+                                       pr);
+    return;
+  }
+  if (GNUNET_YES !=
+      GNUNET_BLOCK_get_key (GSF_block_ctx,
+                           type,
+                           data, data_size, &query))
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+               "Failed to derive key for block of type %d\n",
+               (int) type);
+    GNUNET_break_op (0);
+    return;
+  }
+  GNUNET_STATISTICS_update (GSF_stats,
+                            gettext_noop ("# Replies received from CADET"), 1,
+                            GNUNET_NO);
+  memset (&prq, 0, sizeof (prq));
+  prq.data = data;
+  prq.expiration = expiration;
+  /* do not allow migrated content to live longer than 1 year */
+  prq.expiration = GNUNET_TIME_absolute_min (GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_YEARS),
+                                            prq.expiration);
+  prq.size = data_size;
+  prq.type = type;
+  process_reply (&prq, &query, pr);
+}
+
+
+/**
+ * Consider downloading via cadet (if possible)
+ *
+ * @param pr the pending request to process
+ */
+void
+GSF_cadet_lookup_ (struct GSF_PendingRequest *pr)
+{
+  if (0 != pr->public_data.anonymity_level)
+    return;
+  if (0 == pr->public_data.target)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+               "Cannot do cadet-based download, target peer not known\n");
+    return;
+  }
+  if (NULL != pr->cadet_request)
+    return;
+  pr->cadet_request = GSF_cadet_query (pr->public_data.target,
+                                    &pr->public_data.query,
+                                    pr->public_data.type,
+                                    &cadet_reply_proc,
+                                    pr);
 }
 
 
@@ -1054,9 +1241,8 @@ warn_delay_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
   struct GSF_PendingRequest *pr = cls;
 
   GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
-              _("Datastore lookup already took %llu ms!\n"),
-              (unsigned long long)
-              GNUNET_TIME_absolute_get_duration (pr->qe_start).rel_value);
+              _("Datastore lookup already took %s!\n"),
+              GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_duration (pr->qe_start), GNUNET_YES));
   pr->warn_task =
       GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES, &warn_delay_task,
                                     pr);
@@ -1075,9 +1261,8 @@ odc_warn_delay_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
   struct GSF_PendingRequest *pr = cls;
 
   GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
-              _("On-demand lookup already took %llu ms!\n"),
-              (unsigned long long)
-              GNUNET_TIME_absolute_get_duration (pr->qe_start).rel_value);
+              _("On-demand lookup already took %s!\n"),
+              GNUNET_STRINGS_relative_time_to_string (GNUNET_TIME_absolute_get_duration (pr->qe_start), GNUNET_YES));
   pr->warn_task =
       GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
                                     &odc_warn_delay_task, pr);
@@ -1102,7 +1287,7 @@ odc_warn_delay_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
  *        maybe 0 if no unique identifier is available
  */
 static void
-process_local_reply (void *cls, const GNUNET_HashCode * key, size_t size,
+process_local_reply (void *cls, const struct GNUNET_HashCode * key, size_t size,
                      const void *data, enum GNUNET_BLOCK_Type type,
                      uint32_t priority, uint32_t anonymity,
                      struct GNUNET_TIME_Absolute expiration, uint64_t uid)
@@ -1110,7 +1295,7 @@ process_local_reply (void *cls, const GNUNET_HashCode * key, size_t size,
   struct GSF_PendingRequest *pr = cls;
   GSF_LocalLookupContinuation cont;
   struct ProcessReplyClosure prq;
-  GNUNET_HashCode query;
+  struct GNUNET_HashCode query;
   unsigned int old_rf;
 
   GNUNET_SCHEDULER_cancel (pr->warn_task);
@@ -1120,10 +1305,12 @@ process_local_reply (void *cls, const GNUNET_HashCode * key, size_t size,
     pr->qe = NULL;
     if (NULL == key)
     {
+#if INSANE_STATISTICS
       GNUNET_STATISTICS_update (GSF_stats,
                                 gettext_noop
                                 ("# Datastore lookups concluded (no results)"),
                                 1, GNUNET_NO);
+#endif
     }
     if (GNUNET_NO == pr->have_first_uid)
     {
@@ -1153,29 +1340,25 @@ process_local_reply (void *cls, const GNUNET_HashCode * key, size_t size,
   }
   if (NULL == key)
   {
-#if DEBUG_FS
-    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
                 "No further local responses available.\n");
-#endif
+#if INSANE_STATISTICS
     if ((pr->public_data.type == GNUNET_BLOCK_TYPE_FS_DBLOCK) ||
         (pr->public_data.type == GNUNET_BLOCK_TYPE_FS_IBLOCK))
       GNUNET_STATISTICS_update (GSF_stats,
                                 gettext_noop
                                 ("# requested DBLOCK or IBLOCK not found"), 1,
                                 GNUNET_NO);
+#endif
     goto check_error_and_continue;
   }
-#if DEBUG_FS
   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
               "Received reply for `%s' of type %d with UID %llu from datastore.\n",
               GNUNET_h2s (key), type, (unsigned long long) uid);
-#endif
   if (type == GNUNET_BLOCK_TYPE_FS_ONDEMAND)
   {
-#if DEBUG_FS
     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                 "Found ONDEMAND block, performing on-demand encoding\n");
-#endif
     GNUNET_STATISTICS_update (GSF_stats,
                               gettext_noop
                               ("# on-demand blocks matched requests"), 1,
@@ -1214,18 +1397,17 @@ process_local_reply (void *cls, const GNUNET_HashCode * key, size_t size,
                                   /* queue priority */ ,
                                   (0 !=
                                    (GSF_PRO_PRIORITY_UNLIMITED &
-                                    pr->public_data.options)) ? UINT_MAX : 1
+                                    pr->public_data.options)) ? UINT_MAX :
+                                  GSF_datastore_queue_size
                                   /* max queue size */ ,
                                   GNUNET_TIME_UNIT_FOREVER_REL,
                                   &process_local_reply, pr);
     if (NULL != pr->qe)
-    {
-      GNUNET_STATISTICS_update (GSF_stats,
-                                gettext_noop
-                                ("# Datastore lookups concluded (error queueing)"),
-                                1, GNUNET_NO);
       return;                   /* we're done */
-    }
+    GNUNET_STATISTICS_update (GSF_stats,
+                              gettext_noop
+                              ("# Datastore lookups concluded (error queueing)"),
+                              1, GNUNET_NO);
     goto check_error_and_continue;
   }
   old_rf = pr->public_data.results_found;
@@ -1255,7 +1437,8 @@ process_local_reply (void *cls, const GNUNET_HashCode * key, size_t size,
                                   /* queue priority */ ,
                                   (0 !=
                                    (GSF_PRO_PRIORITY_UNLIMITED &
-                                    pr->public_data.options)) ? UINT_MAX : 1
+                                    pr->public_data.options)) ? UINT_MAX :
+                                  GSF_datastore_queue_size
                                   /* max queue size */ ,
                                   GNUNET_TIME_UNIT_FOREVER_REL,
                                   &process_local_reply, pr);
@@ -1281,7 +1464,7 @@ process_local_reply (void *cls, const GNUNET_HashCode * key, size_t size,
   {
     GNUNET_STATISTICS_update (GSF_stats,
                               gettext_noop
-                              ("# Datastore lookups concluded (found ultimate result)"),
+                              ("# Datastore lookups concluded (found last result)"),
                               1, GNUNET_NO);
     goto check_error_and_continue;
   }
@@ -1289,9 +1472,7 @@ process_local_reply (void *cls, const GNUNET_HashCode * key, size_t size,
       ((GNUNET_YES == GSF_test_get_load_too_high_ (0)) ||
        (pr->public_data.results_found > 5 + 2 * pr->public_data.priority)))
   {
-#if DEBUG_FS > 2
     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Load too high, done with request\n");
-#endif
     GNUNET_STATISTICS_update (GSF_stats,
                               gettext_noop
                               ("# Datastore lookups concluded (load too high)"),
@@ -1314,7 +1495,8 @@ process_local_reply (void *cls, const GNUNET_HashCode * key, size_t size,
                                 /* queue priority */ ,
                                 (0 !=
                                  (GSF_PRO_PRIORITY_UNLIMITED & pr->
-                                  public_data.options)) ? UINT_MAX : 1
+                                  public_data.options)) ? UINT_MAX :
+                                GSF_datastore_queue_size
                                 /* max queue size */ ,
                                 GNUNET_TIME_UNIT_FOREVER_REL,
                                 &process_local_reply, pr);
@@ -1332,27 +1514,52 @@ check_error_and_continue:
   if (NULL == (cont = pr->llc_cont))
     return;                     /* no continuation */
   pr->llc_cont = NULL;
+  if (0 != (GSF_PRO_LOCAL_ONLY & pr->public_data.options))
+  {
+    if (GNUNET_BLOCK_EVALUATION_OK_LAST != pr->local_result)
+    {
+      /* Signal that we are done and that there won't be any
+         additional results to allow client to clean up state. */
+      pr->rh (pr->rh_cls,
+               GNUNET_BLOCK_EVALUATION_OK_LAST,
+               pr,
+               UINT32_MAX,
+               GNUNET_TIME_UNIT_ZERO_ABS,
+               GNUNET_TIME_UNIT_FOREVER_ABS,
+               GNUNET_BLOCK_TYPE_ANY,
+               NULL, 0);
+    }
+    /* Finally, call our continuation to signal that we are
+       done with local processing of this request; i.e. to
+       start reading again from the client. */
+    cont (pr->llc_cont_cls, NULL, GNUNET_BLOCK_EVALUATION_OK_LAST);
+    return;
+  }
+
   cont (pr->llc_cont_cls, pr, pr->local_result);
 }
 
 
 /**
  * Is the given target a legitimate peer for forwarding the given request?
- * 
+ *
  * @param pr request
  * @param target
  * @return GNUNET_YES if this request could be forwarded to the given peer
  */
 int
 GSF_pending_request_test_target_ (struct GSF_PendingRequest *pr,
-                                 const struct GNUNET_PeerIdentity *target)
+                                  const struct GNUNET_PeerIdentity *target)
 {
   struct GNUNET_PeerIdentity pi;
-  
-  if (0 == pr->sender_pid)
+
+  if (0 == pr->origin_pid)
     return GNUNET_YES;
-  GNUNET_PEER_resolve (pr->sender_pid, &pi);
-  return (0 == memcmp (&pi, target, sizeof (struct GNUNET_PeerIdentity))) ? GNUNET_NO :GNUNET_YES;
+  GNUNET_PEER_resolve (pr->origin_pid, &pi);
+  return (0 ==
+          memcmp (&pi, target,
+                  sizeof (struct GNUNET_PeerIdentity))) ? GNUNET_NO :
+      GNUNET_YES;
 }
 
 
@@ -1368,6 +1575,7 @@ GSF_local_lookup_ (struct GSF_PendingRequest *pr,
                    GSF_LocalLookupContinuation cont, void *cont_cls)
 {
   GNUNET_assert (NULL == pr->gh);
+  GNUNET_assert (NULL == pr->cadet_request);
   GNUNET_assert (NULL == pr->llc_cont);
   pr->llc_cont = cont;
   pr->llc_cont_cls = cont_cls;
@@ -1375,9 +1583,11 @@ GSF_local_lookup_ (struct GSF_PendingRequest *pr,
   pr->warn_task =
       GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES, &warn_delay_task,
                                     pr);
+#if INSANE_STATISTICS
   GNUNET_STATISTICS_update (GSF_stats,
                             gettext_noop ("# Datastore lookups initiated"), 1,
                             GNUNET_NO);
+#endif
   pr->qe =
       GNUNET_DATASTORE_get_key (GSF_dsh, pr->local_result_offset++,
                                 &pr->public_data.query,
@@ -1390,16 +1600,17 @@ GSF_local_lookup_ (struct GSF_PendingRequest *pr,
                                 /* queue priority */ ,
                                 (0 !=
                                  (GSF_PRO_PRIORITY_UNLIMITED & pr->
-                                  public_data.options)) ? UINT_MAX : 1
+                                  public_data.options)) ? UINT_MAX :
+                                GSF_datastore_queue_size
                                 /* max queue size */ ,
                                 GNUNET_TIME_UNIT_FOREVER_REL,
                                 &process_local_reply, pr);
   if (NULL != pr->qe)
     return;
   GNUNET_STATISTICS_update (GSF_stats,
-                           gettext_noop
-                           ("# Datastore lookups concluded (error queueing)"),
-                           1, GNUNET_NO);
+                            gettext_noop
+                            ("# Datastore lookups concluded (error queueing)"),
+                            1, GNUNET_NO);
   GNUNET_SCHEDULER_cancel (pr->warn_task);
   pr->warn_task = GNUNET_SCHEDULER_NO_TASK;
   pr->llc_cont = NULL;
@@ -1431,7 +1642,7 @@ GSF_handle_p2p_content_ (struct GSF_ConnectedPeer *cp,
   size_t dsize;
   enum GNUNET_BLOCK_Type type;
   struct GNUNET_TIME_Absolute expiration;
-  GNUNET_HashCode query;
+  struct GNUNET_HashCode query;
   struct ProcessReplyClosure prq;
   struct GNUNET_TIME_Relative block_time;
   double putl;
@@ -1447,6 +1658,9 @@ GSF_handle_p2p_content_ (struct GSF_ConnectedPeer *cp,
   dsize = msize - sizeof (struct PutMessage);
   type = ntohl (put->type);
   expiration = GNUNET_TIME_absolute_ntoh (put->expiration);
+  /* do not allow migrated content to live longer than 1 year */
+  expiration = GNUNET_TIME_absolute_min (GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_YEARS),
+                                        expiration);
   if (type == GNUNET_BLOCK_TYPE_FS_ONDEMAND)
     return GNUNET_SYSERR;
   if (GNUNET_OK !=
@@ -1460,10 +1674,7 @@ GSF_handle_p2p_content_ (struct GSF_ConnectedPeer *cp,
                             GNUNET_NO);
   /* now, lookup 'query' */
   prq.data = (const void *) &put[1];
-  if (NULL != cp)
-    prq.sender = cp;
-  else
-    prq.sender = NULL;
+  prq.sender = cp;
   prq.size = dsize;
   prq.type = type;
   prq.expiration = expiration;
@@ -1477,17 +1688,16 @@ GSF_handle_p2p_content_ (struct GSF_ConnectedPeer *cp,
     GSF_connected_peer_change_preference_ (cp,
                                            CONTENT_BANDWIDTH_VALUE +
                                            1000 * prq.priority);
-    GSF_get_peer_performance_data_ (cp)->trust += prq.priority;
+    GSF_get_peer_performance_data_ (cp)->respect += prq.priority;
   }
   if ((GNUNET_YES == active_to_migration) &&
+      (NULL != cp) &&
       (GNUNET_NO == test_put_load_too_high (prq.priority)))
   {
-#if DEBUG_FS
     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                 "Replicating result for query `%s' with priority %u\n",
                 GNUNET_h2s (&query), prq.priority);
-#endif
-    pmc = GNUNET_malloc (sizeof (struct PutMigrationContext));
+    pmc = GNUNET_new (struct PutMigrationContext);
     pmc->start = GNUNET_TIME_absolute_get ();
     pmc->requested = prq.request_found;
     GNUNET_assert (0 != GSF_get_peer_performance_data_ (cp)->pid);
@@ -1501,22 +1711,21 @@ GSF_handle_p2p_content_ (struct GSF_ConnectedPeer *cp,
                               GNUNET_CONSTANTS_SERVICE_TIMEOUT,
                               &put_migration_continuation, pmc))
     {
-      put_migration_continuation (pmc, GNUNET_NO, NULL);
+      put_migration_continuation (pmc, GNUNET_SYSERR, GNUNET_TIME_UNIT_ZERO_ABS, NULL);
     }
   }
-  else
+  else if (NULL != cp)
   {
-#if DEBUG_FS
     GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                 "Choosing not to keep content `%s' (%d/%d)\n",
                 GNUNET_h2s (&query), active_to_migration,
                 test_put_load_too_high (prq.priority));
-#endif
   }
   putl = GNUNET_LOAD_get_load (datastore_put_load);
-  if ((NULL != (cp = prq.sender)) && (GNUNET_NO == prq.request_found) &&
-      ((GNUNET_YES != active_to_migration) ||
-       (putl > 2.5 * (1 + prq.priority))))
+  if ( (NULL != cp) &&
+       (GNUNET_NO == prq.request_found) &&
+       ( (GNUNET_YES != active_to_migration) ||
+        (putl > 2.5 * (1 + prq.priority)) ) )
   {
     if (GNUNET_YES != active_to_migration)
       putl = 1.0 + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 5);
@@ -1526,7 +1735,14 @@ GSF_handle_p2p_content_ (struct GSF_ConnectedPeer *cp,
                                        GNUNET_CRYPTO_random_u32
                                        (GNUNET_CRYPTO_QUALITY_WEAK,
                                         (unsigned int) (60000 * putl * putl)));
-    GSF_block_peer_migration_ (cp, block_time);
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+               "Asking to stop migration for %s because of load %f and events %d/%d\n",
+               GNUNET_STRINGS_relative_time_to_string (block_time,
+                                                       GNUNET_YES),
+               putl,
+               active_to_migration,
+               (GNUNET_NO == prq.request_found));
+    GSF_block_peer_migration_ (cp, GNUNET_TIME_relative_to_absolute (block_time));
   }
   return GNUNET_OK;
 }
@@ -1543,15 +1759,13 @@ GSF_pending_request_init_ ()
                                              "MAX_PENDING_REQUESTS",
                                              &max_pending_requests))
   {
-    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
-                _
-                ("Configuration fails to specify `%s', assuming default value."),
-                "MAX_PENDING_REQUESTS");
+    GNUNET_log_config_missing (GNUNET_ERROR_TYPE_INFO,
+                              "fs", "MAX_PENDING_REQUESTS");
   }
   active_to_migration =
       GNUNET_CONFIGURATION_get_value_yesno (GSF_cfg, "FS", "CONTENT_CACHING");
   datastore_put_load = GNUNET_LOAD_value_init (DATASTORE_LOAD_AUTODECLINE);
-  pr_map = GNUNET_CONTAINER_multihashmap_create (32 * 1024);
+  pr_map = GNUNET_CONTAINER_multihashmap_create (32 * 1024, GNUNET_YES);
   requests_by_expiration_heap =
       GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
 }