*/
#include "private.h"
+#include <assert.h>
+#include <ccan/build_assert/build_assert.h>
static int fcntl_lock(struct tdb_context *tdb,
int rw, off_t off, off_t len, bool waitflag)
{
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))) {
+ if (offset >= TDB_HASH_LOCK_START + (1 << 30) + tdb->map_size / 8) {
tdb->ecode = TDB_ERR_LOCK;
tdb->log(tdb, TDB_DEBUG_FATAL, tdb->log_priv,
- "tdb_lock: invalid offset %llu for ltype=%d\n",
+ "tdb_lock: invalid offset %llu ltype=%d\n",
(long long)offset, ltype);
return -1;
}
+
if (tdb->flags & TDB_NOLOCK)
return 0;
/* Lock all the hash buckets. */
again:
hash_size = (1ULL << tdb->header.v.hash_bits);
- if (tdb_lock_gradual(tdb, ltype, TDB_HASH_LOCK_START,
- 1ULL << tdb->header.v.hash_bits, flags)) {
+ if (tdb_lock_gradual(tdb, ltype, flags, TDB_HASH_LOCK_START,
+ hash_size)) {
if (!(flags & TDB_LOCK_PROBE)) {
tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
"tdb_lockall hashes failed (%s)\n",
tdb_nest_unlock(tdb, TDB_OPEN_LOCK, F_WRLCK);
}
+int tdb_lock_expand(struct tdb_context *tdb, int ltype)
+{
+ return tdb_nest_lock(tdb, TDB_EXPANSION_LOCK, ltype, TDB_LOCK_WAIT);
+}
+
+void tdb_unlock_expand(struct tdb_context *tdb, int ltype)
+{
+ tdb_nest_unlock(tdb, TDB_EXPANSION_LOCK, ltype);
+}
+
/* unlock entire db */
int tdb_allrecord_unlock(struct tdb_context *tdb, int ltype)
{
int tdb_unlock_list(struct tdb_context *tdb, tdb_off_t list, int ltype)
{
+ list &= ((1ULL << tdb->header.v.hash_bits) - 1);
+
/* a allrecord lock allows us to avoid per chain locks */
if (tdb->allrecord_lock.count) {
if (tdb->allrecord_lock.ltype == F_RDLCK
}
}
-/* Free list locks come after hash locks */
-int tdb_lock_free_list(struct tdb_context *tdb, tdb_off_t flist,
- enum tdb_lock_flags waitflag)
+/* Hash locks use TDB_HASH_LOCK_START + the next 30 bits.
+ * Then we begin; bucket offsets are sizeof(tdb_len_t) apart, so we divide.
+ * The result is that on 32 bit systems we don't use lock values > 2^31 on
+ * files that are less than 4GB.
+ */
+static tdb_off_t free_lock_off(tdb_off_t b_off)
{
+ return TDB_HASH_LOCK_START + (1 << 30) + b_off / sizeof(tdb_off_t);
+}
+
+int tdb_lock_free_bucket(struct tdb_context *tdb, tdb_off_t b_off,
+ enum tdb_lock_flags waitflag)
+{
+ assert(b_off >= sizeof(struct tdb_header));
+
/* You're supposed to have a hash lock first! */
if (!(tdb->flags & TDB_NOLOCK) && !tdb_has_locks(tdb)) {
tdb->ecode = TDB_ERR_LOCK;
return -1;
}
- return tdb_nest_lock(tdb, TDB_HASH_LOCK_START
- + (1ULL << tdb->header.v.hash_bits)
- + flist, F_WRLCK, waitflag);
+ return tdb_nest_lock(tdb, free_lock_off(b_off), F_WRLCK, waitflag);
}
-void tdb_unlock_free_list(struct tdb_context *tdb, tdb_off_t flist)
+void tdb_unlock_free_bucket(struct tdb_context *tdb, tdb_off_t b_off)
{
if (tdb->allrecord_lock.count)
return;
- tdb_nest_unlock(tdb, TDB_HASH_LOCK_START
- + (1ULL << tdb->header.v.hash_bits)
- + flist, F_WRLCK);
+ tdb_nest_unlock(tdb, free_lock_off(b_off), 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)
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 */
"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,