changes to .tdb files lost
pierre.filippone at retail-sc.com
Fri Sep 9 10:17:53 GMT 2005
"Gerald (Jerry) Carter" <jerry at samba.org> wrote on 08.09.2005 17:50:34:
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> Pierre Filippone wrote:
> | So I switched off the disk controller's write cache,
> | turned off journaling (ext3->ext2), made the
> | changes again and checked the results with "tdbdump
> | account_policy.tdb", "pdbedit" and "net rpc rights
> | list". All changes (seemed to be) in there. Then I
> | stopped samba ( kill -15 ) and rebooted again.
> | Changes lost again.
> Is a reboot required? Or are the changes lost
> on a smbd restart?
Yes, reboot is required. After a smbd restart alone the changes are still
> What platform is this? COUld you retest with 'use mmap = no'
> as well?
We use SLES 9 SP 2. 'mmap = no' solves it.
Meanwhile I found this in the msync man page:
msync flushes changes made to the in-core copy of a file
that was mapped into memory using mmap(2) back to disk.
Without use of this call there is no guarantee that
changes are written back before munmap(2) is called.
I tried an "msync(tdb->map_ptr, tdb->map_size, MS_SYNC);" right before the
munmap() in tdb/tdb.c and it fixes the problem. Changes are still there
The only thing that is strange, is that the mtime of account_policy.tdb
still does not change.
Maybe my first bug fix ? ;-)
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