fl.l_len = len;
fl.l_pid = 0;
+ add_stat(tdb, lock_lowlevel, 1);
if (waitflag)
return fcntl(tdb->fd, F_SETLKW, &fl);
- else
+ else {
+ add_stat(tdb, lock_nonblock, 1);
return fcntl(tdb->fd, F_SETLK, &fl);
+ }
}
static int fcntl_unlock(struct tdb_context *tdb, int rw, off_t off, off_t len)
if (tdb->flags & TDB_NOLOCK)
return 0;
+ add_stat(tdb, locks, 1);
+
new_lck = find_nestlock(tdb, offset);
if (new_lck) {
if (new_lck->ltype == F_RDLCK && ltype == F_WRLCK) {
return -1;
}
+ add_stat(tdb, locks, 1);
again:
/* Lock hashes, gradually. */
if (tdb_lock_gradual(tdb, ltype, flags, TDB_HASH_LOCK_START,
return false;
}
-#if 0
-/* lock entire database with write lock */
-int tdb_lockall(struct tdb_context *tdb)
-{
- tdb_trace(tdb, "tdb_lockall");
- return tdb_allrecord_lock(tdb, F_WRLCK, TDB_LOCK_WAIT, false);
-}
-
-/* lock entire database with write lock - nonblocking varient */
-int tdb_lockall_nonblock(struct tdb_context *tdb)
-{
- int ret = tdb_allrecord_lock(tdb, F_WRLCK, TDB_LOCK_NOWAIT, false);
- tdb_trace_ret(tdb, "tdb_lockall_nonblock", ret);
- return ret;
-}
-
-/* unlock entire database with write lock */
-int tdb_unlockall(struct tdb_context *tdb)
-{
- tdb_trace(tdb, "tdb_unlockall");
- return tdb_allrecord_unlock(tdb, F_WRLCK);
-}
-
-/* lock entire database with read lock */
-int tdb_lockall_read(struct tdb_context *tdb)
-{
- tdb_trace(tdb, "tdb_lockall_read");
- return tdb_allrecord_lock(tdb, F_RDLCK, TDB_LOCK_WAIT, false);
-}
-
-/* lock entire database with read lock - nonblock varient */
-int tdb_lockall_read_nonblock(struct tdb_context *tdb)
-{
- int ret = tdb_allrecord_lock(tdb, F_RDLCK, TDB_LOCK_NOWAIT, false);
- tdb_trace_ret(tdb, "tdb_lockall_read_nonblock", ret);
- return ret;
-}
-
-/* unlock entire database with read lock */
-int tdb_unlockall_read(struct tdb_context *tdb)
-{
- tdb_trace(tdb, "tdb_unlockall_read");
- return tdb_allrecord_unlock(tdb, F_RDLCK);
-}
-#endif
-
static bool tdb_has_free_lock(struct tdb_context *tdb)
{
unsigned int i;
tdb_nest_unlock(tdb, free_lock_off(b_off), 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 */
-int tdb_chainlock_nonblock(struct tdb_context *tdb, TDB_DATA key)
-{
- return chainlock(tdb, &key, F_WRLCK, TDB_LOCK_NOWAIT,
- "tdb_chainlock_nonblock");
-}
-
-int tdb_chainlock_read(struct tdb_context *tdb, TDB_DATA key)
-{
- return chainlock(tdb, &key, F_RDLCK, TDB_LOCK_WAIT,
- "tdb_chainlock_read");
-}
-
-int tdb_chainunlock_read(struct tdb_context *tdb, TDB_DATA key)
-{
- uint64_t h = tdb_hash(tdb, key.dptr, key.dsize);
- tdb_trace_1rec(tdb, "tdb_chainunlock_read", key);
- return tdb_unlock_list(tdb, h & ((1ULL << tdb->header.v.hash_bits)-1),
- F_RDLCK);
-}
-
-/* record lock stops delete underneath */
-int tdb_lock_record(struct tdb_context *tdb, tdb_off_t off)
-{
- if (tdb->allrecord_lock.count) {
- return 0;
- }
- return off ? tdb_brlock(tdb, F_RDLCK, off, 1, TDB_LOCK_WAIT) : 0;
-}
-
-/*
- Write locks override our own fcntl readlocks, so check it here.
- Note this is meant to be F_SETLK, *not* F_SETLKW, as it's not
- an error to fail to get the lock here.
-*/
-int tdb_write_lock_record(struct tdb_context *tdb, tdb_off_t off)
-{
- struct tdb_traverse_lock *i;
- for (i = &tdb->travlocks; i; i = i->next)
- if (i->off == off)
- return -1;
- if (tdb->allrecord_lock.count) {
- if (tdb->allrecord_lock.ltype == F_WRLCK) {
- return 0;
- }
- return -1;
- }
- return tdb_brlock(tdb, F_WRLCK, off, 1, TDB_LOCK_NOWAIT|TDB_LOCK_PROBE);
-}
-
-int tdb_write_unlock_record(struct tdb_context *tdb, tdb_off_t off)
-{
- if (tdb->allrecord_lock.count) {
- return 0;
- }
- return tdb_brunlock(tdb, F_WRLCK, off, 1);
-}
-
-/* fcntl locks don't stack: avoid unlocking someone else's */
-int tdb_unlock_record(struct tdb_context *tdb, tdb_off_t off)
-{
- struct tdb_traverse_lock *i;
- uint32_t count = 0;
-
- if (tdb->allrecord_lock.count) {
- return 0;
- }
-
- if (off == 0)
- return 0;
- for (i = &tdb->travlocks; i; i = i->next)
- if (i->off == off)
- count++;
- return (count == 1 ? tdb_brunlock(tdb, F_RDLCK, off, 1) : 0);
-}
-
-/* The transaction code uses this to remove all locks. */
-void tdb_release_transaction_locks(struct tdb_context *tdb)
-{
- unsigned int i;
-
- if (tdb->allrecord_lock.count != 0) {
- tdb_off_t hash_size, free_size;
-
- hash_size = (1ULL << tdb->header.v.hash_bits)
- * sizeof(tdb_off_t);
- free_size = tdb->header.v.free_zones
- * (tdb->header.v.free_buckets + 1) * sizeof(tdb_off_t);
-
- tdb_brunlock(tdb, tdb->allrecord_lock.ltype,
- tdb->header.v.hash_off, hash_size);
- tdb_brunlock(tdb, tdb->allrecord_lock.ltype,
- tdb->header.v.free_off, free_size);
- tdb->allrecord_lock.count = 0;
- tdb->allrecord_lock.ltype = 0;
- }
-
- for (i = 0; i<tdb->num_lockrecs; i++) {
- struct tdb_lock_type *lck = &tdb->lockrecs[i];
-
- tdb_brunlock(tdb, lck->ltype, lck->off, 1);
- }
- tdb->num_lockrecs = 0;
- SAFE_FREE(tdb->lockrecs);
- tdb->header_uptodate = false;
-}
-#endif
-
void tdb_lock_init(struct tdb_context *tdb)
{
tdb->num_lockrecs = 0;
projects / ccan / blobdiff