fsync/msync calls are made.
- if TDB_ALLOW_NESTING is passed to flags in tdb open, or added using
- tdb_add_flags() transaction is enabled.
- The default is that transaction nesting is not allowed and an attempt
- to create a nested transaction will fail with TDB_ERR_NESTING.
+ tdb_add_flags() transaction nesting is enabled.
+ It resets the TDB_DISALLOW_NESTING flag, as both cannot be used together.
+ The default is that transaction nesting is allowed.
+ Note: this default may change in future versions of tdb.
Beware. when transactions are nested a transaction successfully
completed with tdb_transaction_commit() can be silently unrolled later.
+
+ - if TDB_DISALLOW_NESTING is passed to flags in tdb open, or added using
+ tdb_add_flags() transaction nesting is disabled.
+ It resets the TDB_ALLOW_NESTING flag, as both cannot be used together.
+ An attempt create a nested transaction will fail with TDB_ERR_NESTING.
+ The default is that transaction nesting is allowed.
+ Note: this default may change in future versions of tdb.
*/
bool prepared;
tdb_off_t magic_offset;
+ /* set when the GLOBAL_LOCK has been taken */
+ bool global_lock_taken;
+
/* old file size before transaction */
tdb_len_t old_map_size;
/*
brlock during a transaction - ignore them
*/
-static int transaction_brlock(struct tdb_context *tdb, tdb_off_t offset,
- int rw_type, int lck_type, int probe, size_t len)
+static int transaction_brlock(struct tdb_context *tdb,
+ int rw_type, tdb_off_t offset, size_t len,
+ enum tdb_lock_flags flags)
+{
+ return 0;
+}
+
+static int transaction_brunlock(struct tdb_context *tdb,
+ int rw_type, tdb_off_t offset, size_t len)
{
return 0;
}
transaction_next_hash_chain,
transaction_oob,
transaction_expand_file,
- transaction_brlock
+ transaction_brlock,
+ transaction_brunlock
};
/* get a read lock from the freelist to the end of file. This
is upgraded to a write lock during the commit */
- if (tdb_brlock(tdb, FREELIST_TOP, F_RDLCK, F_SETLKW, 0, 0) == -1) {
+ if (tdb_brlock(tdb, F_RDLCK, FREELIST_TOP, 0, TDB_LOCK_WAIT) == -1) {
TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_transaction_start: failed to get hash locks\n"));
tdb->ecode = TDB_ERR_LOCK;
goto fail;
return 0;
fail:
- tdb_brlock(tdb, FREELIST_TOP, F_UNLCK, F_SETLKW, 0, 0);
- tdb_transaction_unlock(tdb);
+ tdb_brunlock(tdb, F_RDLCK, FREELIST_TOP, 0);
+ tdb_transaction_unlock(tdb, F_WRLCK);
SAFE_FREE(tdb->transaction->blocks);
SAFE_FREE(tdb->transaction->hash_heads);
SAFE_FREE(tdb->transaction);
return 0;
}
- if (fsync(tdb->fd) != 0) {
+ if (fdatasync(tdb->fd) != 0) {
tdb->ecode = TDB_ERR_IO;
TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_transaction: fsync failed\n"));
return -1;
}
-int _tdb_transaction_cancel(struct tdb_context *tdb)
+/* ltype is F_WRLCK after prepare. */
+static int _tdb_transaction_cancel(struct tdb_context *tdb, int ltype)
{
int i, ret = 0;
if (tdb->transaction->magic_offset) {
const struct tdb_methods *methods = tdb->transaction->io_methods;
- uint32_t zero = 0;
+ const uint32_t invalid = TDB_RECOVERY_INVALID_MAGIC;
/* remove the recovery marker */
- if (methods->tdb_write(tdb, tdb->transaction->magic_offset, &zero, 4) == -1 ||
+ if (methods->tdb_write(tdb, tdb->transaction->magic_offset, &invalid, 4) == -1 ||
transaction_sync(tdb, tdb->transaction->magic_offset, 4) == -1) {
TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_transaction_cancel: failed to remove recovery magic\n"));
ret = -1;
}
}
+ if (tdb->transaction->global_lock_taken) {
+ tdb_brunlock(tdb, F_WRLCK, GLOBAL_LOCK, 1);
+ tdb->transaction->global_lock_taken = false;
+ }
+
/* remove any global lock created during the transaction */
if (tdb->global_lock.count != 0) {
- tdb_brlock(tdb, FREELIST_TOP, F_UNLCK, F_SETLKW, 0, 4*tdb->header.hash_size);
+ tdb_brunlock(tdb, tdb->global_lock.ltype,
+ FREELIST_TOP, 4*tdb->header.hash_size);
tdb->global_lock.count = 0;
}
/* remove any locks created during the transaction */
if (tdb->num_locks != 0) {
for (i=0;i<tdb->num_lockrecs;i++) {
- tdb_brlock(tdb,FREELIST_TOP+4*tdb->lockrecs[i].list,
- F_UNLCK,F_SETLKW, 0, 1);
+ tdb_brunlock(tdb, tdb->lockrecs[i].ltype,
+ FREELIST_TOP+4*tdb->lockrecs[i].list, 1);
}
tdb->num_locks = 0;
tdb->num_lockrecs = 0;
/* restore the normal io methods */
tdb->methods = tdb->transaction->io_methods;
- tdb_brlock(tdb, FREELIST_TOP, F_UNLCK, F_SETLKW, 0, 0);
- tdb_transaction_unlock(tdb);
+ tdb_brunlock(tdb, ltype, FREELIST_TOP, 0);
+ tdb_transaction_unlock(tdb, F_WRLCK);
SAFE_FREE(tdb->transaction->hash_heads);
SAFE_FREE(tdb->transaction);
*/
int tdb_transaction_cancel(struct tdb_context *tdb)
{
+ int ltype = F_RDLCK;
tdb_trace(tdb, "tdb_transaction_cancel");
- return _tdb_transaction_cancel(tdb);
+ if (tdb->transaction && tdb->transaction->prepared)
+ ltype = F_WRLCK;
+ return _tdb_transaction_cancel(tdb, ltype);
}
/*
rec.rec_len = 0;
- if (recovery_head != 0 &&
- methods->tdb_read(tdb, recovery_head, &rec, sizeof(rec), DOCONV()) == -1) {
- TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_recovery_allocate: failed to read recovery record\n"));
- return -1;
+ if (recovery_head != 0) {
+ if (methods->tdb_read(tdb, recovery_head, &rec, sizeof(rec), DOCONV()) == -1) {
+ TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_recovery_allocate: failed to read recovery record\n"));
+ return -1;
+ }
+ /* ignore invalid recovery regions: can happen in crash */
+ if (rec.magic != TDB_RECOVERY_MAGIC &&
+ rec.magic != TDB_RECOVERY_INVALID_MAGIC) {
+ recovery_head = 0;
+ }
}
*recovery_size = tdb_recovery_size(tdb);
rec = (struct tdb_record *)data;
memset(rec, 0, sizeof(*rec));
- rec->magic = 0;
+ rec->magic = TDB_RECOVERY_INVALID_MAGIC;
rec->data_len = recovery_size;
rec->rec_len = recovery_max_size;
rec->key_len = old_map_size;
if (tdb->transaction->prepared) {
tdb->ecode = TDB_ERR_EINVAL;
- _tdb_transaction_cancel(tdb);
+ _tdb_transaction_cancel(tdb, F_WRLCK);
TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_transaction_prepare_commit: transaction already prepared\n"));
return -1;
}
if (tdb->transaction->transaction_error) {
tdb->ecode = TDB_ERR_IO;
- _tdb_transaction_cancel(tdb);
+ _tdb_transaction_cancel(tdb, F_RDLCK);
TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_transaction_prepare_commit: transaction error pending\n"));
return -1;
}
if (tdb->num_locks || tdb->global_lock.count) {
tdb->ecode = TDB_ERR_LOCK;
TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_transaction_prepare_commit: locks pending on commit\n"));
- _tdb_transaction_cancel(tdb);
+ _tdb_transaction_cancel(tdb, F_RDLCK);
return -1;
}
if (tdb_brlock_upgrade(tdb, FREELIST_TOP, 0) == -1) {
TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_transaction_prepare_commit: failed to upgrade hash locks\n"));
tdb->ecode = TDB_ERR_LOCK;
- _tdb_transaction_cancel(tdb);
+ _tdb_transaction_cancel(tdb, F_RDLCK);
return -1;
}
/* get the global lock - this prevents new users attaching to the database
during the commit */
- if (tdb_brlock(tdb, GLOBAL_LOCK, F_WRLCK, F_SETLKW, 0, 1) == -1) {
+ if (tdb_brlock(tdb, F_WRLCK, GLOBAL_LOCK, 1, TDB_LOCK_WAIT) == -1) {
TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_transaction_prepare_commit: failed to get global lock\n"));
tdb->ecode = TDB_ERR_LOCK;
- _tdb_transaction_cancel(tdb);
+ _tdb_transaction_cancel(tdb, F_WRLCK);
return -1;
}
+ tdb->transaction->global_lock_taken = true;
+
if (!(tdb->flags & TDB_NOSYNC)) {
/* write the recovery data to the end of the file */
if (transaction_setup_recovery(tdb, &tdb->transaction->magic_offset) == -1) {
TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_transaction_prepare_commit: failed to setup recovery data\n"));
- tdb_brlock(tdb, GLOBAL_LOCK, F_UNLCK, F_SETLKW, 0, 1);
- _tdb_transaction_cancel(tdb);
+ _tdb_transaction_cancel(tdb, F_WRLCK);
return -1;
}
}
tdb->transaction->old_map_size) == -1) {
tdb->ecode = TDB_ERR_IO;
TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_transaction_prepare_commit: expansion failed\n"));
- tdb_brlock(tdb, GLOBAL_LOCK, F_UNLCK, F_SETLKW, 0, 1);
- _tdb_transaction_cancel(tdb);
+ _tdb_transaction_cancel(tdb, F_WRLCK);
return -1;
}
tdb->map_size = tdb->transaction->old_map_size;
if (tdb->transaction->transaction_error) {
tdb->ecode = TDB_ERR_IO;
- _tdb_transaction_cancel(tdb);
+ _tdb_transaction_cancel(tdb, F_RDLCK);
TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_transaction_commit: transaction error pending\n"));
return -1;
}
/* check for a null transaction */
if (tdb->transaction->blocks == NULL) {
- _tdb_transaction_cancel(tdb);
+ _tdb_transaction_cancel(tdb, F_RDLCK);
return 0;
}
tdb->methods = methods;
tdb_transaction_recover(tdb);
- _tdb_transaction_cancel(tdb);
- tdb_brlock(tdb, GLOBAL_LOCK, F_UNLCK, F_SETLKW, 0, 1);
+ _tdb_transaction_cancel(tdb, F_WRLCK);
TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_transaction_commit: write failed\n"));
return -1;
return -1;
}
- tdb_brlock(tdb, GLOBAL_LOCK, F_UNLCK, F_SETLKW, 0, 1);
-
/*
TODO: maybe write to some dummy hdr field, or write to magic
offset without mmap, before the last sync, instead of the
/* use a transaction cancel to free memory and remove the
transaction locks */
- _tdb_transaction_cancel(tdb);
+ _tdb_transaction_cancel(tdb, F_WRLCK);
if (need_repack) {
return tdb_repack(tdb);
git.samba.org / samba.git / blobdiff