/*
* __wt_txn_checkpoint_log --
* Write a log record for a checkpoint operation.
*/
int
__wt_txn_checkpoint_log(
WT_SESSION_IMPL *session, bool full, uint32_t flags, WT_LSN *lsnp)
{
WT_CONNECTION_IMPL *conn;
WT_DECL_ITEM(logrec);
WT_DECL_RET;
WT_ITEM *ckpt_snapshot, empty;
WT_LSN *ckpt_lsn;
WT_TXN *txn;
WT_TXN_GLOBAL *txn_global;
uint8_t *end, *p;
size_t recsize;
uint32_t i, rectype;
const char *fmt;
conn = S2C(session);
txn_global = &conn->txn_global;
txn = &session->txn;
ckpt_lsn = &txn->ckpt_lsn;
/*
* If this is a file sync, log it unless there is a full checkpoint in
* progress.
*/
if (!full) {
if (txn->full_ckpt) {
if (lsnp != NULL)
*lsnp = *ckpt_lsn;
return (0);
}
return (__txn_log_file_sync(session, flags, lsnp));
}
switch (flags) {
case WT_TXN_LOG_CKPT_PREPARE:
txn->full_ckpt = true;
if (conn->compat_major >= WT_LOG_V2) {
/*
* Write the system log record containing a checkpoint
* start operation.
*/
rectype = WT_LOGREC_SYSTEM;
fmt = WT_UNCHECKED_STRING(I);
WT_ERR(__wt_struct_size(
session, &recsize, fmt, rectype));
WT_ERR(__wt_logrec_alloc(session, recsize, &logrec));
WT_ERR(__wt_struct_pack(session,
(uint8_t *)logrec->data + logrec->size, recsize,
fmt, rectype));
logrec->size += (uint32_t)recsize;
WT_ERR(__wt_logop_checkpoint_start_pack(
session, logrec));
WT_ERR(__wt_log_write(session, logrec, ckpt_lsn, 0));
} else {
WT_ERR(__wt_log_printf(session,
"CHECKPOINT: Starting record"));
WT_ERR(__wt_log_flush_lsn(session, ckpt_lsn, true));
}
/*
* We take and immediately release the visibility lock.
* Acquiring the write lock guarantees that any transaction
* that has written to the log has also made its transaction
* visible at this time.
*/
__wt_writelock(session, &txn_global->visibility_rwlock);
__wt_writeunlock(session, &txn_global->visibility_rwlock);
/*
* We need to make sure that the log records in the checkpoint
* LSN are on disk. In particular to make sure that the
* current log file exists.
*/
WT_ERR(__wt_log_force_sync(session, ckpt_lsn));
break;
case WT_TXN_LOG_CKPT_START:
/* Take a copy of the transaction snapshot. */
txn->ckpt_nsnapshot = txn->snapshot_count;
recsize = (size_t)txn->ckpt_nsnapshot * WT_INTPACK64_MAXSIZE;
WT_ERR(__wt_scr_alloc(session, recsize, &txn->ckpt_snapshot));
p = txn->ckpt_snapshot->mem;
end = p + recsize;
for (i = 0; i < txn->snapshot_count; i++)
WT_ERR(__wt_vpack_uint(
&p, WT_PTRDIFF(end, p), txn->snapshot[i]));
break;
case WT_TXN_LOG_CKPT_STOP:
/*
* During a clean connection close, we get here without the
* prepare or start steps. In that case, log the current LSN
* as the checkpoint LSN.
*/
if (!txn->full_ckpt) {
txn->ckpt_nsnapshot = 0;
WT_CLEAR(empty);
ckpt_snapshot = ∅
WT_ERR(__wt_log_flush_lsn(session, ckpt_lsn, true));
} else
ckpt_snapshot = txn->ckpt_snapshot;
/* Write the checkpoint log record. */
rectype = WT_LOGREC_CHECKPOINT;
fmt = WT_UNCHECKED_STRING(IIIIu);
WT_ERR(__wt_struct_size(session, &recsize,
fmt, rectype, ckpt_lsn->l.file, ckpt_lsn->l.offset,
txn->ckpt_nsnapshot, ckpt_snapshot));
WT_ERR(__wt_logrec_alloc(session, recsize, &logrec));
WT_ERR(__wt_struct_pack(session,
(uint8_t *)logrec->data + logrec->size, recsize,
fmt, rectype, ckpt_lsn->l.file, ckpt_lsn->l.offset,
txn->ckpt_nsnapshot, ckpt_snapshot));
logrec->size += (uint32_t)recsize;
WT_ERR(__wt_log_write(session, logrec, lsnp,
F_ISSET(conn, WT_CONN_CKPT_SYNC) ?
WT_LOG_FSYNC : 0));
/*
* If this full checkpoint completed successfully and there is
* no hot backup in progress and this is not an unclean
* recovery, tell the logging subsystem the checkpoint LSN so
* that it can archive. Do not update the logging checkpoint
* LSN if this is during a clean connection close, only during
* a full checkpoint. A clean close may not update any
* metadata LSN and we do not want to archive in that case.
*/
if (!conn->hot_backup &&
(!FLD_ISSET(conn->log_flags, WT_CONN_LOG_RECOVER_DIRTY) ||
FLD_ISSET(conn->log_flags, WT_CONN_LOG_FORCE_DOWNGRADE)) &&
txn->full_ckpt)
__wt_log_ckpt(session, ckpt_lsn);
/* FALLTHROUGH */
case WT_TXN_LOG_CKPT_CLEANUP:
/* Cleanup any allocated resources */
WT_INIT_LSN(ckpt_lsn);
txn->ckpt_nsnapshot = 0;
__wt_scr_free(session, &txn->ckpt_snapshot);
txn->full_ckpt = false;
break;
WT_ILLEGAL_VALUE_ERR(session);
}
err: __wt_logrec_free(session, &logrec);
return (ret);
}
/*
* __wt_txn_checkpoint_log --
* Write a log record for a checkpoint operation.
*/
int
__wt_txn_checkpoint_log(
WT_SESSION_IMPL *session, bool full, uint32_t flags, WT_LSN *lsnp)
{
WT_DECL_ITEM(logrec);
WT_DECL_RET;
WT_ITEM *ckpt_snapshot, empty;
WT_LSN *ckpt_lsn;
WT_TXN *txn;
uint8_t *end, *p;
size_t recsize;
uint32_t i, rectype = WT_LOGREC_CHECKPOINT;
const char *fmt = WT_UNCHECKED_STRING(IIQIU);
txn = &session->txn;
ckpt_lsn = &txn->ckpt_lsn;
/*
* If this is a file sync, log it unless there is a full checkpoint in
* progress.
*/
if (!full) {
if (txn->full_ckpt) {
if (lsnp != NULL)
*lsnp = *ckpt_lsn;
return (0);
}
return (__txn_log_file_sync(session, flags, lsnp));
}
switch (flags) {
case WT_TXN_LOG_CKPT_PREPARE:
txn->full_ckpt = true;
WT_ERR(__wt_log_flush_lsn(session, ckpt_lsn, true));
/*
* We need to make sure that the log records in the checkpoint
* LSN are on disk. In particular to make sure that the
* current log file exists.
*/
WT_ERR(__wt_log_force_sync(session, ckpt_lsn));
break;
case WT_TXN_LOG_CKPT_START:
/* Take a copy of the transaction snapshot. */
txn->ckpt_nsnapshot = txn->snapshot_count;
recsize = txn->ckpt_nsnapshot * WT_INTPACK64_MAXSIZE;
WT_ERR(__wt_scr_alloc(session, recsize, &txn->ckpt_snapshot));
p = txn->ckpt_snapshot->mem;
end = p + recsize;
for (i = 0; i < txn->snapshot_count; i++)
WT_ERR(__wt_vpack_uint(
&p, WT_PTRDIFF(end, p), txn->snapshot[i]));
break;
case WT_TXN_LOG_CKPT_STOP:
/*
* During a clean connection close, we get here without the
* prepare or start steps. In that case, log the current LSN
* as the checkpoint LSN.
*/
if (!txn->full_ckpt) {
txn->ckpt_nsnapshot = 0;
WT_CLEAR(empty);
ckpt_snapshot = ∅
WT_ERR(__wt_log_flush_lsn(session, ckpt_lsn, true));
} else
ckpt_snapshot = txn->ckpt_snapshot;
/* Write the checkpoint log record. */
WT_ERR(__wt_struct_size(session, &recsize, fmt,
rectype, ckpt_lsn->file, ckpt_lsn->offset,
txn->ckpt_nsnapshot, ckpt_snapshot));
WT_ERR(__wt_logrec_alloc(session, recsize, &logrec));
WT_ERR(__wt_struct_pack(session,
(uint8_t *)logrec->data + logrec->size, recsize, fmt,
rectype, ckpt_lsn->file, ckpt_lsn->offset,
txn->ckpt_nsnapshot, ckpt_snapshot));
logrec->size += (uint32_t)recsize;
WT_ERR(__wt_log_write(session, logrec, lsnp,
F_ISSET(S2C(session), WT_CONN_CKPT_SYNC) ?
WT_LOG_FSYNC : 0));
/*
* If this full checkpoint completed successfully and there is
* no hot backup in progress, tell the logging subsystem the
* checkpoint LSN so that it can archive. Do not update the
* logging checkpoint LSN if this is during a clean connection
* close, only during a full checkpoint. A clean close may not
* update any metadata LSN and we do not want to archive in
* that case.
*/
if (!S2C(session)->hot_backup && txn->full_ckpt)
WT_ERR(__wt_log_ckpt(session, ckpt_lsn));
/* FALLTHROUGH */
case WT_TXN_LOG_CKPT_CLEANUP:
/* Cleanup any allocated resources */
WT_INIT_LSN(ckpt_lsn);
txn->ckpt_nsnapshot = 0;
__wt_scr_free(session, &txn->ckpt_snapshot);
txn->full_ckpt = false;
break;
WT_ILLEGAL_VALUE_ERR(session);
}
err: __wt_logrec_free(session, &logrec);
return (ret);
}