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Fsync directory after creating or unlinking file.

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If file was created/deleted just before powerloss it's possible that
file system will miss that. To prevent it, call fsync() where creating/
unlinkg file is critical.

Author: Michael Paquier
Reviewed-by: Ashutosh Bapat, Takayuki Tsunakawa, me
This commit is contained in:
Teodor Sigaev
2017-03-27 19:33:01 +03:00
parent 1f171a1803
commit 1b02be21f2
6 changed files with 78 additions and 13 deletions
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14
src/backend/access/transam/clog.c
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@ -577,6 +577,13 @@ ShutdownCLOG(void)
/* Flush dirty CLOG pages to disk */
TRACE_POSTGRESQL_CLOG_CHECKPOINT_START(false);
SimpleLruFlush(ClogCtl, false);
/*
* fsync pg_xact to ensure that any files flushed previously are durably
* on disk.
*/
fsync_fname("pg_xact", true);
TRACE_POSTGRESQL_CLOG_CHECKPOINT_DONE(false);
}
@ -589,6 +596,13 @@ CheckPointCLOG(void)
/* Flush dirty CLOG pages to disk */
TRACE_POSTGRESQL_CLOG_CHECKPOINT_START(true);
SimpleLruFlush(ClogCtl, true);
/*
* fsync pg_xact to ensure that any files flushed previously are durably
* on disk.
*/
fsync_fname("pg_xact", true);
TRACE_POSTGRESQL_CLOG_CHECKPOINT_DONE(true);
}