X-Git-Url: http://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Ftdb2%2Ftraverse.c;h=0bf418990b55deec32e84f662261920962c832dd;hp=66319dd56764d823dfca54544cfd2ee0d22aea03;hb=614259f13c3e694fcd6b57fc05a329066e43c76d;hpb=6804501c350181dea8f531142b28c620b70edbd9

diff --git a/ccan/tdb2/traverse.c b/ccan/tdb2/traverse.c
index 66319dd5..0bf41899 100644
--- a/ccan/tdb2/traverse.c
+++ b/ccan/tdb2/traverse.c
@@ -1,7 +1,7 @@
- /* 
+ /*
    Trivial Database 2: traverse function.
    Copyright (C) Rusty Russell 2010
-   
+
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
@@ -18,41 +18,117 @@
 #include "private.h"
 #include <ccan/likely/likely.h>
 
-static int64_t traverse(struct tdb_context *tdb, int ltype,
-			tdb_traverse_func fn, void *p)
+int64_t tdb_traverse_(struct tdb_context *tdb,
+		      int (*fn)(struct tdb_context *,
+				TDB_DATA, TDB_DATA, void *),
+		      void *p)
 {
-	int ret;
+	enum TDB_ERROR ecode;
 	struct traverse_info tinfo;
 	struct tdb_data k, d;
 	int64_t count = 0;
 
-	for (ret = first_in_hash(tdb, ltype, &tinfo, &k, &d.dsize);
-	     ret == 1;
-	     ret = next_in_hash(tdb, ltype, &tinfo, &k, &d.dsize)) {
+	if (tdb->flags & TDB_VERSION1) {
+		count = tdb1_traverse(tdb, fn, p);
+		if (count == -1)
+			return TDB_ERR_TO_OFF(tdb->last_error);
+		return count;
+	}
+
+	k.dptr = NULL;
+	for (ecode = first_in_hash(tdb, &tinfo, &k, &d.dsize);
+	     ecode == TDB_SUCCESS;
+	     ecode = next_in_hash(tdb, &tinfo, &k, &d.dsize)) {
 		d.dptr = k.dptr + k.dsize;
 		
 		count++;
-		if (fn && fn(tdb, k, d, p))
-			break;
+		if (fn && fn(tdb, k, d, p)) {
+			free(k.dptr);
+			tdb->last_error = TDB_SUCCESS;
+			return count;
+		}
+		free(k.dptr);
 	}
 
-	if (ret < 0)
-		return -1;
+	if (ecode != TDB_ERR_NOEXIST) {
+		return TDB_ERR_TO_OFF(tdb->last_error = ecode);
+	}
+	tdb->last_error = TDB_SUCCESS;
 	return count;
 }
+	
+enum TDB_ERROR tdb_firstkey(struct tdb_context *tdb, struct tdb_data *key)
+{
+	struct traverse_info tinfo;
+
+	if (tdb->flags & TDB_VERSION1) {
+		tdb->last_error = TDB_SUCCESS;
+		*key = tdb1_firstkey(tdb);
+		/* TDB1 didn't set error for last key. */
+		if (!key->dptr && tdb->last_error == TDB_SUCCESS) {
+			tdb->last_error = TDB_ERR_NOEXIST;
+		}
+		return tdb->last_error;
+	}
+
+	return tdb->last_error = first_in_hash(tdb, &tinfo, key, NULL);
+}
+
+/* We lock twice, not very efficient.  We could keep last key & tinfo cached. */
+enum TDB_ERROR tdb_nextkey(struct tdb_context *tdb, struct tdb_data *key)
+{
+	struct traverse_info tinfo;
+	struct hash_info h;
+	struct tdb_used_record rec;
+
+	if (tdb->flags & TDB_VERSION1) {
+		struct tdb_data last_key = *key;
+		tdb->last_error = TDB_SUCCESS;
+		*key = tdb1_nextkey(tdb, last_key);
+		free(last_key.dptr);
+		/* TDB1 didn't set error for last key. */
+		if (!key->dptr && tdb->last_error == TDB_SUCCESS) {
+			tdb->last_error = TDB_ERR_NOEXIST;
+		}
+		return tdb->last_error;
+	}
+
+	tinfo.prev = find_and_lock(tdb, *key, F_RDLCK, &h, &rec, &tinfo);
+	free(key->dptr);
+	if (TDB_OFF_IS_ERR(tinfo.prev)) {
+		return tdb->last_error = TDB_OFF_TO_ERR(tinfo.prev);
+	}
+	tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range, F_RDLCK);
+
+	return tdb->last_error = next_in_hash(tdb, &tinfo, key, NULL);
+}
 
-int64_t tdb_traverse(struct tdb_context *tdb, tdb_traverse_func fn, void *p)
+static int wipe_one(struct tdb_context *tdb,
+		    TDB_DATA key, TDB_DATA data, enum TDB_ERROR *ecode)
 {
-	return traverse(tdb, F_WRLCK, fn, p);
+	*ecode = tdb_delete(tdb, key);
+	return (*ecode != TDB_SUCCESS);
 }
-	
-int64_t tdb_traverse_read(struct tdb_context *tdb,
-			  tdb_traverse_func fn, void *p)
+
+enum TDB_ERROR tdb_wipe_all(struct tdb_context *tdb)
 {
-	int64_t ret;
-	bool was_ro = tdb->read_only;
-	tdb->read_only = true;
-	ret = traverse(tdb, F_RDLCK, fn, p);
-	tdb->read_only = was_ro;
-	return ret;
+	enum TDB_ERROR ecode;
+	int64_t count;
+
+	if (tdb->flags & TDB_VERSION1) {
+		if (tdb1_wipe_all(tdb) == -1)
+			return tdb->last_error;
+		return TDB_SUCCESS;
+	}
+
+	ecode = tdb_allrecord_lock(tdb, F_WRLCK, TDB_LOCK_WAIT, false);
+	if (ecode != TDB_SUCCESS)
+		return tdb->last_error = ecode;
+
+	/* FIXME: Be smarter. */
+	count = tdb_traverse(tdb, wipe_one, &ecode);
+	if (count < 0)
+		ecode = TDB_OFF_TO_ERR(count);
+	tdb_allrecord_unlock(tdb, F_WRLCK);
+	return tdb->last_error = ecode;
 }