X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=servers%2Fslapd%2Fback-mdb%2Fsearch.c;h=98b5f2557f20895337e8f407c5698097505a3feb;hb=ee66ed41d0cb0ac2a45ab07dba369299d4733970;hp=9872c52205d7292bf7ea6974c606742a8d8794e2;hpb=cb7405ae5cbe2b4b0d29bd376db27c7d56048261;p=openldap

diff --git a/servers/slapd/back-mdb/search.c b/servers/slapd/back-mdb/search.c
index 9872c52205..98b5f2557f 100644
--- a/servers/slapd/back-mdb/search.c
+++ b/servers/slapd/back-mdb/search.c
@@ -31,10 +31,9 @@ static int search_candidates(
 	Operation *op,
 	SlapReply *rs,
 	Entry *e,
-	MDB_txn *txn,
+	IdScopes *isc,
 	MDB_cursor *mci,
 	ID	*ids,
-	ID2L	scopes,
 	ID *stack );
 
 static int parse_paged_cookie( Operation *op, SlapReply *rs );
@@ -131,9 +130,8 @@ static int search_aliases(
 	Operation *op,
 	SlapReply *rs,
 	ID e_id,
-	MDB_txn *txn,
+	IdScopes *isc,
 	MDB_cursor *mci,
-	ID2L scopes,
 	ID *stack )
 {
 	ID *aliases, *curscop, *visited, *newsubs, *oldsubs, *tmp;
@@ -159,7 +157,7 @@ static int search_aliases(
 
 	/* Find all aliases in database */
 	MDB_IDL_ZERO( aliases );
-	rs->sr_err = mdb_filter_candidates( op, txn, &af, aliases,
+	rs->sr_err = mdb_filter_candidates( op, isc->mt, &af, aliases,
 		curscop, visited );
 	if (rs->sr_err != LDAP_SUCCESS || MDB_IDL_IS_ZERO( aliases )) {
 		return rs->sr_err;
@@ -177,7 +175,7 @@ static int search_aliases(
 		/* Set curscop to only the aliases in the current scope. Start with
 		 * all the aliases, then get the intersection with the scope.
 		 */
-		rs->sr_err = mdb_idscope( op, txn, e_id, aliases, curscop );
+		rs->sr_err = mdb_idscope( op, isc->mt, e_id, aliases, curscop );
 
 		/* Dereference all of the aliases in the current scope. */
 		cursora = 0;
@@ -199,7 +197,7 @@ static int search_aliases(
 
 			/* Actually dereference the alias */
 			MDB_IDL_ZERO(tmp);
-			a = deref_base( op, rs, a, &matched, txn,
+			a = deref_base( op, rs, a, &matched, isc->mt,
 				tmp, visited );
 			if (a) {
 				/* If the target was not already in our current scopes,
@@ -208,10 +206,18 @@ static int search_aliases(
 				ID2 mid;
 				mid.mid = a->e_id;
 				mid.mval.mv_data = NULL;
-				if (mdb_id2l_insert(scopes, &mid) == 0) {
+				if (op->ors_scope == LDAP_SCOPE_SUBTREE) {
+					isc->id = a->e_id;
+					/* if ID is a child of any of our current scopes,
+					 * ignore it, it's already included.
+					 */
+					if (mdb_idscopechk(op, isc))
+						goto skip;
+				}
+				if (mdb_id2l_insert(isc->scopes, &mid) == 0) {
 					mdb_idl_insert(newsubs, a->e_id);
 				}
-				mdb_entry_return( op, a );
+skip:			mdb_entry_return( op, a );
 
 			} else if (matched) {
 				/* Alias could not be dereferenced, or it deref'd to
@@ -316,6 +322,75 @@ static void scope_chunk_ret( Operation *op, ID2 *scopes )
 
 static void *search_stack( Operation *op );
 
+typedef struct ww_ctx {
+	MDB_txn *txn;
+	MDB_cursor *mcd;	/* if set, save cursor context */
+	ID key;
+	MDB_val data;
+	int flag;
+} ww_ctx;
+
+/* ITS#7904 if we get blocked while writing results to client,
+ * release the current reader txn and reacquire it after we
+ * unblock.
+ * Slight problem - if we're doing a scope-based walk (mdb_dn2id_walk)
+ * to return results, we need to remember the state of the mcd cursor.
+ * If the node that cursor was pointing to gets deleted while we're
+ * blocked, we may be unable to restore the cursor position. In that
+ * case return an LDAP_BUSY error - let the client know this search
+ * couldn't succeed, but might succeed on a retry.
+ */
+static void
+mdb_writewait( Operation *op, slap_callback *sc )
+{
+	ww_ctx *ww = sc->sc_private;
+	if ( !ww->flag ) {
+		if ( ww->mcd ) {
+			MDB_val key, data;
+			mdb_cursor_get( ww->mcd, &key, &data, MDB_GET_CURRENT );
+			memcpy( &ww->key, key.mv_data, sizeof(ID) );
+			ww->data.mv_size = data.mv_size;
+			ww->data.mv_data = op->o_tmpalloc( data.mv_size, op->o_tmpmemctx );
+			memcpy(ww->data.mv_data, data.mv_data, data.mv_size);
+		}
+		mdb_txn_reset( ww->txn );
+		ww->flag = 1;
+	}
+}
+
+static int
+mdb_waitfixup( Operation *op, ww_ctx *ww, MDB_cursor *mci, MDB_cursor *mcd )
+{
+	int rc = 0;
+	ww->flag = 0;
+	mdb_txn_renew( ww->txn );
+	mdb_cursor_renew( ww->txn, mci );
+	mdb_cursor_renew( ww->txn, mcd );
+	if ( ww->mcd ) {
+		MDB_val key, data;
+		key.mv_size = sizeof(ID);
+		key.mv_data = &ww->key;
+		data = ww->data;
+		rc = mdb_cursor_get( mcd, &key, &data, MDB_GET_BOTH );
+		if ( rc == MDB_NOTFOUND ) {
+			data = ww->data;
+			rc = mdb_cursor_get( mcd, &key, &data, MDB_GET_BOTH_RANGE );
+			/* the loop will skip this node using NEXT_DUP but we want it
+			 * sent, so go back one space first
+			 */
+			if ( rc == MDB_SUCCESS )
+				mdb_cursor_get( mcd, &key, &data, MDB_PREV_DUP );
+			else
+				rc = LDAP_BUSY;
+		} else if ( rc ) {
+			rc = LDAP_OTHER;
+		}
+		op->o_tmpfree( ww->data.mv_data, op->o_tmpmemctx );
+		ww->data.mv_data = NULL;
+	}
+	return rc;
+}
+
 int
 mdb_search( Operation *op, SlapReply *rs )
 {
@@ -335,6 +410,8 @@ mdb_search( Operation *op, SlapReply *rs )
 	int		tentries = 0;
 	IdScopes	isc;
 	MDB_cursor	*mci, *mcd;
+	ww_ctx wwctx;
+	slap_callback cb = { 0 };
 
 	mdb_op_info	opinfo = {{{0}}}, *moi = &opinfo;
 	MDB_txn			*ltid = NULL;
@@ -568,7 +645,7 @@ dn2entry_retry:
 		scopes[1].mid = base->e_id;
 		scopes[1].mval.mv_data = NULL;
 		rs->sr_err = search_candidates( op, rs, base,
-			ltid, mci, candidates, scopes, stack );
+			&isc, mci, candidates, stack );
 		ncand = MDB_IDL_N( candidates );
 		if ( !base->e_id || ncand == NOID ) {
 			/* grab entry count from id2entry stat
@@ -611,6 +688,17 @@ dn2entry_retry:
 		tentries = ncand;
 	}
 
+	wwctx.flag = 0;
+	/* If we're running in our own read txn */
+	if (  moi == &opinfo ) {
+		cb.sc_writewait = mdb_writewait;
+		cb.sc_private = &wwctx;
+		wwctx.txn = ltid;
+		wwctx.mcd = NULL;
+		cb.sc_next = op->o_callback;
+		op->o_callback = &cb;
+	}
+
 	if ( get_pagedresults( op ) > SLAP_CONTROL_IGNORED ) {
 		PagedResultsState *ps = op->o_pagedresults_state;
 		/* deferred cookie parsing */
@@ -661,6 +749,7 @@ dn2entry_retry:
 			iscopes[0] = 0;
 		}
 
+		wwctx.mcd = mcd;
 		isc.id = base->e_id;
 		isc.numrdns = 0;
 		rc = mdb_dn2id_walk( op, &isc );
@@ -936,7 +1025,8 @@ notfound:
 
 			send_search_reference( op, rs );
 
-			mdb_entry_return( op, e );
+			if (e != base)
+				mdb_entry_return( op, e );
 			rs->sr_entry = NULL;
 			e = NULL;
 
@@ -944,6 +1034,14 @@ notfound:
 			ber_bvarray_free( erefs );
 			rs->sr_ref = NULL;
 
+			if ( wwctx.flag ) {
+				rs->sr_err = mdb_waitfixup( op, &wwctx, mci, mcd );
+				if ( rs->sr_err ) {
+					send_ldap_result( op, rs );
+					goto done;
+				}
+			}
+
 			goto loop_continue;
 		}
 
@@ -998,6 +1096,13 @@ notfound:
 					}
 					goto done;
 				}
+				if ( wwctx.flag ) {
+					rs->sr_err = mdb_waitfixup( op, &wwctx, mci, mcd );
+					if ( rs->sr_err ) {
+						send_ldap_result( op, rs );
+						goto done;
+					}
+				}
 			}
 
 		} else {
@@ -1062,6 +1167,17 @@ nochange:
 	rs->sr_err = LDAP_SUCCESS;
 
 done:
+	if ( cb.sc_private ) {
+		/* remove our writewait callback */
+		slap_callback **scp = &op->o_callback;
+		while ( *scp ) {
+			if ( *scp == &cb ) {
+				*scp = cb.sc_next;
+				cb.sc_private = NULL;
+				break;
+			}
+		}
+	}
 	mdb_cursor_close( mcd );
 	mdb_cursor_close( mci );
 	if ( moi == &opinfo ) {
@@ -1075,7 +1191,7 @@ done:
 		rs->sr_v2ref = NULL;
 	}
 	if (base)
-		mdb_entry_return( op,base);
+		mdb_entry_return( op, base );
 	scope_chunk_ret( op, scopes );
 
 	return rs->sr_err;
@@ -1164,10 +1280,9 @@ static int search_candidates(
 	Operation *op,
 	SlapReply *rs,
 	Entry *e,
-	MDB_txn *txn,
+	IdScopes *isc,
 	MDB_cursor *mci,
 	ID	*ids,
-	ID2L	scopes,
 	ID *stack )
 {
 	struct mdb_info *mdb = (struct mdb_info *) op->o_bd->be_private;
@@ -1230,13 +1345,13 @@ static int search_candidates(
 	}
 
 	if( op->ors_deref & LDAP_DEREF_SEARCHING ) {
-		rc = search_aliases( op, rs, e->e_id, txn, mci, scopes, stack );
+		rc = search_aliases( op, rs, e->e_id, isc, mci, stack );
 	} else {
 		rc = LDAP_SUCCESS;
 	}
 
 	if ( rc == LDAP_SUCCESS ) {
-		rc = mdb_filter_candidates( op, txn, f, ids,
+		rc = mdb_filter_candidates( op, isc->mt, f, ids,
 			stack, stack+MDB_IDL_UM_SIZE );
 	}