Re: CVS commit: src/sys/kern

[Thor Lancelot Simon <tls%rek.tjls.com@localhost>]

On Wed, Sep 24, 2008 at 01:19:43PM -0500, David Young wrote:
> On Wed, Sep 24, 2008 at 01:46:34PM -0400, Thor Lancelot Simon wrote:
> > 
> > This also breaks products which run from flash with their filesystems 
> > mounted
> > read-only most of the time, but remount them read-write in order to write
> > back configuration data when it changes.  That is not an uncommon model
> > AFAIK and it poses a fairly major problem for me.
> 
> Your application sounds similar to mine.  I gave up remounting a
> read-write filesystem read-only long, long ago, because if I created or
> deleted and re-created as few as one or two files, remounted read-only,
> and rebooted shortly thereafter, the filesystem had lost the most
> recently created files.  I have probably annotated the problem report
> with that information.

When is "long, long ago"?  We have not updated our sources from the NetBSD trunk
in about three months, but I haven't seen any sign of this problem.  One 
difference
may be that our configuration information is stored in a "repository" file and 
then
extracted back into a mounted-on-top memory filesystem early in boot; when we 
remount
read-write, typically the only file we update is the repository, after which we 
fsync
it and sync the filesystem before remounting r/o. 

Unfortunately the change in question makes that impossible...

Thor