tdb2: fix valgrind warnings.

[ccan] / ccan / tdb2 / lock.c

diff --git a/ccan/tdb2/lock.c b/ccan/tdb2/lock.c
index 2b00584580810ad9aca0ae24dd6f880bd58d0796..c7c449abc1a37091824563475b7aa7558f89e759 100644 (file)
--- a/ccan/tdb2/lock.c
+++ b/ccan/tdb2/lock.c
@@ -255,13 +255,18 @@ static int tdb_nest_lock(struct tdb_context *tdb, tdb_off_t offset, int ltype,
 {
        struct tdb_lock_type *new_lck;
 
-       if (offset >= TDB_HASH_LOCK_START + (1ULL << tdb->header.v.hash_bits)
-           + (tdb->header.v.num_zones * (tdb->header.v.free_buckets+1))) {
-               tdb->ecode = TDB_ERR_LOCK;
-               tdb->log(tdb, TDB_DEBUG_FATAL, tdb->log_priv,
-                        "tdb_lock: invalid offset %llu for ltype=%d\n",
-                        (long long)offset, ltype);
-               return -1;
+       /* Header is not valid for open lock; valgrind complains. */
+       if (offset >= TDB_HASH_LOCK_START) {
+               if (offset > TDB_HASH_LOCK_START
+                   + (1ULL << tdb->header.v.hash_bits)
+                   + (tdb->header.v.num_zones
+                      * (tdb->header.v.free_buckets+1))) {
+                       tdb->ecode = TDB_ERR_LOCK;
+                       tdb->log(tdb, TDB_DEBUG_FATAL, tdb->log_priv,
+                                "tdb_lock: invalid offset %llu ltype=%d\n",
+                                (long long)offset, ltype);
+                       return -1;
+               }
        }
        if (tdb->flags & TDB_NOLOCK)
                return 0;
@@ -719,7 +724,8 @@ void tdb_unlock_free_list(struct tdb_context *tdb, tdb_off_t flist)
                        + flist, F_WRLCK);
 }
 
-#if 0
+/* Even if the entry isn't in this hash bucket, you'd have to lock this
+ * bucket to find it. */
 static int chainlock(struct tdb_context *tdb, const TDB_DATA *key,
                     int ltype, enum tdb_lock_flags waitflag,
                     const char *func)
@@ -739,6 +745,14 @@ int tdb_chainlock(struct tdb_context *tdb, TDB_DATA key)
        return chainlock(tdb, &key, F_WRLCK, TDB_LOCK_WAIT, "tdb_chainlock");
 }
 
+int tdb_chainunlock(struct tdb_context *tdb, TDB_DATA key)
+{
+       uint64_t h = tdb_hash(tdb, key.dptr, key.dsize);
+       tdb_trace_1rec(tdb, "tdb_chainunlock", key);
+       return tdb_unlock_list(tdb, h, F_WRLCK);
+}
+
+#if 0
 /* lock/unlock one hash chain, non-blocking. This is meant to be used
    to reduce contention - it cannot guarantee how many records will be
    locked */
@@ -748,14 +762,6 @@ int tdb_chainlock_nonblock(struct tdb_context *tdb, TDB_DATA key)
                         "tdb_chainlock_nonblock");
 }
 
-int tdb_chainunlock(struct tdb_context *tdb, TDB_DATA key)
-{
-       uint64_t h = tdb_hash(tdb, key.dptr, key.dsize);
-       tdb_trace_1rec(tdb, "tdb_chainunlock", key);
-       return tdb_unlock_list(tdb, h & ((1ULL << tdb->header.v.hash_bits)-1),
-                              F_WRLCK);
-}
-
 int tdb_chainlock_read(struct tdb_context *tdb, TDB_DATA key)
 {
        return chainlock(tdb, &key, F_RDLCK, TDB_LOCK_WAIT,