[Samba] NFS quotas: truncated files without warning

[Jeremy Allison]

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.

Thanks,

	Jeremy.