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Prevent shutdown in normal mode if online backup is running, and

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have pg_ctl warn about this.

Cancel running online backups (by renaming the backup_label file,
thus rendering the backup useless) when shutting down in fast mode.

Laurenz Albe
This commit is contained in:
Magnus Hagander
2008-04-23 13:44:59 +00:00
parent cf23b75b4d
commit c979a1fefa
6 changed files with 115 additions and 14 deletions
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52
src/backend/access/transam/xlog.c
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.298 2008/04/21 00:26:44 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.299 2008/04/23 13:44:58 mha Exp $
*
*-------------------------------------------------------------------------
*/
@ -6577,6 +6577,7 @@ pg_start_backup_callback(int code, Datum arg)
* create a backup history file in pg_xlog (whence it will immediately be
* archived). The backup history file contains the same info found in
* the label file, plus the backup-end time and WAL location.
* Note: different from CancelBackup which just cancels online backup mode.
*/
Datum
pg_stop_backup(PG_FUNCTION_ARGS)
@ -7063,3 +7064,52 @@ rm_redo_error_callback(void *arg)
pfree(buf.data);
}
/*
* BackupInProgress: check if online backup mode is active
*
* This is done by checking for existence of the "backup_label" file.
*/
bool
BackupInProgress(void)
{
struct stat stat_buf;
return (stat(BACKUP_LABEL_FILE, &stat_buf) == 0);
}
/*
* CancelBackup: rename the "backup_label" file to cancel backup mode
*
* If the "backup_label" file exists, it will be renamed to "backup_label.old".
* Note that this will render an online backup in progress useless.
* To correctly finish an online backup, pg_stop_backup must be called.
*/
void
CancelBackup(void)
{
struct stat stat_buf;
/* if the file is not there, return */
if (stat(BACKUP_LABEL_FILE, &stat_buf) < 0)
return;
/* remove leftover file from previously cancelled backup if it exists */
unlink(BACKUP_LABEL_OLD);
if (rename(BACKUP_LABEL_FILE, BACKUP_LABEL_OLD) == 0)
{
ereport(LOG,
(errmsg("online backup mode cancelled"),
errdetail("\"%s\" renamed to \"%s\"",
BACKUP_LABEL_FILE, BACKUP_LABEL_OLD)));
}
else
{
ereport(WARNING,
(errcode_for_file_access(),
errmsg("could not rename \"%s\" to \"%s\", backup mode not cancelled: %m",
BACKUP_LABEL_FILE, BACKUP_LABEL_OLD)));
}
}