diff options
| author | Robert Haas <rhaas@postgresql.org> | 2022-03-24 14:32:06 -0400 |
|---|---|---|
| committer | Robert Haas <rhaas@postgresql.org> | 2022-03-24 14:52:28 -0400 |
| commit | 412ad7a55639516f284cd0ef9757d6ae5c7abd43 (patch) | |
| tree | a37a03184c7cea9fb8b031644a5d4117cd78c66a /src/backend/storage/buffer/bufmgr.c | |
| parent | 86459b3296803cfa4d3e53c0fc8763412c71b6d0 (diff) | |
| download | postgresql-412ad7a55639516f284cd0ef9757d6ae5c7abd43.tar.gz postgresql-412ad7a55639516f284cd0ef9757d6ae5c7abd43.zip | |
Fix possible recovery trouble if TRUNCATE overlaps a checkpoint.
If TRUNCATE causes some buffers to be invalidated and thus the
checkpoint does not flush them, TRUNCATE must also ensure that the
corresponding files are truncated on disk. Otherwise, a replay
from the checkpoint might find that the buffers exist but have
the wrong contents, which may cause replay to fail.
Report by Teja Mupparti. Patch by Kyotaro Horiguchi, per a design
suggestion from Heikki Linnakangas, with some changes to the
comments by me. Review of this and a prior patch that approached
the issue differently by Heikki Linnakangas, Andres Freund, Álvaro
Herrera, Masahiko Sawada, and Tom Lane.
Discussion: http://postgr.es/m/BYAPR06MB6373BF50B469CA393C614257ABF00@BYAPR06MB6373.namprd06.prod.outlook.com
Diffstat (limited to 'src/backend/storage/buffer/bufmgr.c')
| -rw-r--r-- | src/backend/storage/buffer/bufmgr.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c index f5459c68f89..11005edc735 100644 --- a/src/backend/storage/buffer/bufmgr.c +++ b/src/backend/storage/buffer/bufmgr.c @@ -3911,7 +3911,9 @@ MarkBufferDirtyHint(Buffer buffer, bool buffer_std) * essential that CreateCheckPoint waits for virtual transactions * rather than full transactionids. */ - MyProc->delayChkpt = delayChkpt = true; + Assert((MyProc->delayChkpt & DELAY_CHKPT_START) == 0); + MyProc->delayChkpt |= DELAY_CHKPT_START; + delayChkpt = true; lsn = XLogSaveBufferForHint(buffer, buffer_std); } @@ -3944,7 +3946,7 @@ MarkBufferDirtyHint(Buffer buffer, bool buffer_std) UnlockBufHdr(bufHdr, buf_state); if (delayChkpt) - MyProc->delayChkpt = false; + MyProc->delayChkpt &= ~DELAY_CHKPT_START; if (dirtied) { |