[Samba] NFS quotas: truncated files without warning

[simo]

On Mon, 2007-06-18 at 12:21 -0700, Jeremy Allison wrote:
> On Mon, Jun 18, 2007 at 08:48:09PM +0200, SER.RI-TIC - David Losada wrote:
> > Hi Jeremy,
> > 
> > actually, I have adapted your patch for applying to the current RHEL4
> > Samba release (samba-3.0.10-1.4E.12.2). Would you mind to check if I
> > have made any flagrant mistakes? If anyone reads this and decides to try
> > it, please bear in mind it's experimental.
> > 
> > Summary of what I have modified from your patch:
> > 
> > * no patch for smbd/aio.c , because it's just not there yet in this release
> > * in smbd/fileio.c:sync_file() , doesn't check for the "sync always"
> > directive, the check's not originally there
> > * in smbd/fileio.c:sync_file() , for accessing the fd, it's just
> > "fsp->fd", not "fsp->fh->fd"
> > * in smbd/reply.c:reply_write() , ignored the hunk around
> > CHECK_WRITE(fsp), because in this release that check is not made
> > * took into account that the checking of conditions for forcing
> > synchronization (lp_strict_sync, lp_sync_always, write_through) hadn't
> > yet been refactored into the fileio.c:sync_file() function
> > 
> > If patching from a vanilla samba-3.0.10 release, should apply the
> > "smbd_deferred_open_backport" patch first. I'm also attaching it for
> > convenience.
> > 
> > If your patch makes it to next Samba official release, and this patch
> > receives your blessing, could we put them in consideration of RedHat for
> > an errata? The fact it helps to avoid silent data corruption in an
> > scenario like ours, should be interesting for them.
> 
> This work looks good - it's not a complex change.
> 
> The fix will definately be in 3.0.25b, I'll let Simo
> pick up the change for RH for their older versions if
> he thinks it's warrented.

I'd really prefer an entry in RHs bugzilla to be able to easily pick it
up :-)

Simo.

-- 
Simo Sorce
Samba Team GPL Compliance Officer
email: idra at samba.org
http://samba.org