[PATCH] replace tdb database by simple lockless file database

This makes the udev operation completely lockless by storing a
file for every node in /dev/.udevdb/* This solved the problem
with deadlocking concurrent udev processes waiting for each other
to release the file lock under heavy load.

1 files changed, 0 insertions, 137 deletions

diff --git a/tdb/tdbbackup.c b/tdb/tdbbackup.c
deleted file mode 100644
index 0eaf6b6c0b..0000000000
--- a/tdb/tdbbackup.c
+++ /dev/null
@@ -1,137 +0,0 @@
-/* 
-   Unix SMB/CIFS implementation.
-   low level tdb backup and restore utility
-   Copyright (C) Andrew Tridgell              2002
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2 of the License, or
-   (at your option) any later version.
-   
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-   
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-*/
-
-/*
-
-  This program is meant for backup/restore of tdb databases. Typical usage would be:
-     tdbbackup *.tdb
-  when Samba shuts down cleanly, which will make a backup of all the local databases
-  to *.bak files. Then on Samba startup you would use:
-     tdbbackup -v *.tdb
-  and this will check the databases for corruption and if corruption is detected then
-  the backup will be restored.
-
-  You may also like to do a backup on a regular basis while Samba is
-  running, perhaps using cron.
-
-  The reason this program is needed is to cope with power failures
-  while Samba is running. A power failure could lead to database
-  corruption and Samba will then not start correctly.
-
-  Note that many of the databases in Samba are transient and thus
-  don't need to be backed up, so you can optimise the above a little
-  by only running the backup on the critical databases.
-
- */
-
-#include <errno.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <string.h>
-#include <fcntl.h>
-#include <time.h>
-#include <sys/mman.h>
-#include <sys/stat.h>
-#include <sys/time.h>
-#include <ctype.h>
-#include <signal.h>
-#include "tdb.h"
-#include "tdbback.h"
-
-/*
-  see if one file is newer than another
-*/
-static int file_newer(const char *fname1, const char *fname2)
-{
-	struct stat st1, st2;
-	if (stat(fname1, &st1) != 0) {
-		return 0;
-	}
-	if (stat(fname2, &st2) != 0) {
-		return 1;
-	}
-	return (st1.st_mtime > st2.st_mtime);
-}
-
-static void usage(void)
-{
-	printf("Usage: tdbbackup [options] <fname...>\n\n");
-	printf("   -h            this help message\n");
-	printf("   -s suffix     set the backup suffix\n");
-	printf("   -v            verify mode (restore if corrupt)\n");
-}
-		
-
- int main(int argc, char *argv[])
-{
-	int i;
-	int ret = 0;
-	int c;
-	int verify = 0;
-	const char *suffix = ".bak";
-	extern int optind;
-	extern char *optarg;
-
-	while ((c = getopt(argc, argv, "vhs:")) != -1) {
-		switch (c) {
-		case 'h':
-			usage();
-			exit(0);
-		case 'v':
-			verify = 1;
-			break;
-		case 's':
-			suffix = optarg;
-			break;
-		}
-	}
-
-	argc -= optind;
-	argv += optind;
-
-	if (argc < 1) {
-		usage();
-		exit(1);
-	}
-
-	for (i=0; i<argc; i++) {
-		const char *fname = argv[i];
-		char *bak_name;
-
-		bak_name = add_suffix(fname, suffix);
-
-		if (verify) {
-			if (verify_tdb(fname, bak_name) != 0) {
-				ret = 1;
-			}
-		} else {
-			if (file_newer(fname, bak_name) &&
-			    backup_tdb(fname, bak_name) != 0) {
-				ret = 1;
-			}
-		}
-
-		free(bak_name);
-	}
-
-	return ret;
-}