still available, but no transaction recovery area is used and no
fsync/msync calls are made.
+ - if TDB_ALLOW_NESTING is passed to flags in tdb open, or added using
+ 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;
+
+ /* we should re-pack on commit */
+ bool need_repack;
};
{
uint32_t blk;
- /* Only a commit is allowed on a prepared transaction */
- if (tdb->transaction->prepared) {
- tdb->ecode = TDB_ERR_EINVAL;
- TDB_LOG((tdb, TDB_DEBUG_FATAL, "transaction_read: transaction already prepared, read not allowed\n"));
- tdb->transaction->transaction_error = 1;
- return -1;
- }
-
/* break it down into block sized ops */
while (len + (off % tdb->transaction->block_size) > tdb->transaction->block_size) {
tdb_len_t len2 = tdb->transaction->block_size - (off % tdb->transaction->block_size);
if (len <= tdb->map_size) {
return 0;
}
- return TDB_ERRCODE(TDB_ERR_IO, -1);
+ tdb->ecode = TDB_ERR_IO;
+ return -1;
}
/*
return -1;
}
+ tdb->transaction->need_repack = true;
+
return 0;
}
/* cope with nested tdb_transaction_start() calls */
if (tdb->transaction != NULL) {
+ if (!(tdb->flags & TDB_ALLOW_NESTING)) {
+ tdb->ecode = TDB_ERR_NESTING;
+ return -1;
+ }
tdb->transaction->nesting++;
TDB_LOG((tdb, TDB_DEBUG_TRACE, "tdb_transaction_start: nesting %d\n",
tdb->transaction->nesting));
tdb->transaction->io_methods = tdb->methods;
tdb->methods = &transaction_methods;
+ /* Trace at the end, so we get sequence number correct. */
+ tdb_trace(tdb, "tdb_transaction_start");
return 0;
fail:
*/
static int transaction_sync(struct tdb_context *tdb, tdb_off_t offset, tdb_len_t length)
{
+ if (tdb->flags & TDB_NOSYNC) {
+ return 0;
+ }
+
if (fsync(tdb->fd) != 0) {
tdb->ecode = TDB_ERR_IO;
TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_transaction: fsync failed\n"));
}
-/*
- cancel the current transaction
-*/
-int tdb_transaction_cancel(struct tdb_context *tdb)
+int _tdb_transaction_cancel(struct tdb_context *tdb)
{
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_brlock(tdb, GLOBAL_LOCK, F_UNLCK, F_SETLKW, 0, 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);
return ret;
}
+/*
+ cancel the current transaction
+*/
+int tdb_transaction_cancel(struct tdb_context *tdb)
+{
+ tdb_trace(tdb, "tdb_transaction_cancel");
+ return _tdb_transaction_cancel(tdb);
+}
/*
work out how much space the linearised recovery data will consume
tdb_off_t *recovery_offset,
tdb_len_t *recovery_max_size)
{
- struct list_struct rec;
+ struct tdb_record rec;
const struct tdb_methods *methods = tdb->transaction->io_methods;
tdb_off_t recovery_head;
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);
tdb_len_t recovery_size;
unsigned char *data, *p;
const struct tdb_methods *methods = tdb->transaction->io_methods;
- struct list_struct *rec;
+ struct tdb_record *rec;
tdb_off_t recovery_offset, recovery_max_size;
tdb_off_t old_map_size = tdb->transaction->old_map_size;
uint32_t magic, tailer;
return -1;
}
- rec = (struct list_struct *)data;
+ 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;
magic = TDB_RECOVERY_MAGIC;
CONVERT(magic);
- *magic_offset = recovery_offset + offsetof(struct list_struct, magic);
+ *magic_offset = recovery_offset + offsetof(struct tdb_record, magic);
if (methods->tdb_write(tdb, *magic_offset, &magic, sizeof(magic)) == -1) {
TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_transaction_setup_recovery: failed to write recovery magic\n"));
return 0;
}
-/*
- prepare to commit the current transaction
-*/
-int tdb_transaction_prepare_commit(struct tdb_context *tdb)
+static int _tdb_transaction_prepare_commit(struct tdb_context *tdb)
{
const struct tdb_methods *methods;
if (tdb->transaction->prepared) {
tdb->ecode = TDB_ERR_EINVAL;
- tdb_transaction_cancel(tdb);
+ _tdb_transaction_cancel(tdb);
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);
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);
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);
return -1;
}
if (tdb_brlock(tdb, GLOBAL_LOCK, F_WRLCK, F_SETLKW, 0, 1) == -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);
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);
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);
return -1;
}
tdb->map_size = tdb->transaction->old_map_size;
return 0;
}
+/*
+ prepare to commit the current transaction
+*/
+int tdb_transaction_prepare_commit(struct tdb_context *tdb)
+{
+ tdb_trace(tdb, "tdb_transaction_prepare_commit");
+ return _tdb_transaction_prepare_commit(tdb);
+}
+
/*
commit the current transaction
*/
{
const struct tdb_methods *methods;
int i;
+ bool need_repack;
if (tdb->transaction == NULL) {
TDB_LOG((tdb, TDB_DEBUG_ERROR, "tdb_transaction_commit: no transaction\n"));
return -1;
}
+ tdb_trace(tdb, "tdb_transaction_commit");
+
if (tdb->transaction->transaction_error) {
tdb->ecode = TDB_ERR_IO;
- tdb_transaction_cancel(tdb);
+ _tdb_transaction_cancel(tdb);
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);
return 0;
}
if (!tdb->transaction->prepared) {
- int ret = tdb_transaction_prepare_commit(tdb);
+ int ret = _tdb_transaction_prepare_commit(tdb);
if (ret)
return ret;
}
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);
TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_transaction_commit: write failed\n"));
return -1;
SAFE_FREE(tdb->transaction->blocks);
tdb->transaction->num_blocks = 0;
- if (!(tdb->flags & TDB_NOSYNC)) {
- /* ensure the new data is on disk */
- if (transaction_sync(tdb, 0, tdb->map_size) == -1) {
- return -1;
- }
+ /* ensure the new data is on disk */
+ if (transaction_sync(tdb, 0, tdb->map_size) == -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
utime(tdb->name, NULL);
#endif
+ need_repack = tdb->transaction->need_repack;
+
/* use a transaction cancel to free memory and remove the
transaction locks */
- tdb_transaction_cancel(tdb);
+ _tdb_transaction_cancel(tdb);
+
+ if (need_repack) {
+ return tdb_repack(tdb);
+ }
return 0;
}
tdb_off_t recovery_head, recovery_eof;
unsigned char *data, *p;
uint32_t zero = 0;
- struct list_struct rec;
+ struct tdb_record rec;
/* find the recovery area */
if (tdb_ofs_read(tdb, TDB_RECOVERY_HEAD, &recovery_head) == -1) {
}
/* remove the recovery magic */
- if (tdb_ofs_write(tdb, recovery_head + offsetof(struct list_struct, magic),
+ if (tdb_ofs_write(tdb, recovery_head + offsetof(struct tdb_record, magic),
&zero) == -1) {
TDB_LOG((tdb, TDB_DEBUG_FATAL, "tdb_transaction_recover: failed to remove recovery magic\n"));
tdb->ecode = TDB_ERR_IO;
git.samba.org / ira / wip.git / blobdiff