Date: Wed, 17 Nov 2010 17:38:54 +0100 From: Markus Gebert <markus.gebert@hostpoint.ch> To: George Mamalakis <mamalos@eng.auth.gr> Cc: freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: chflags on zfs (sappnd) Message-ID: <DCEDCE25-4F26-4FB9-B16E-8EA83F75FB51@hostpoint.ch> In-Reply-To: <4CE3B320.70302@eng.auth.gr> References: <4CE3B320.70302@eng.auth.gr>
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On 17.11.2010, at 11:49, George Mamalakis wrote: > Hi everbody, > > from http://wiki.freebsd.org/ZFS I understand that chflags are supported by zfs. But if I have a file with sappnd on a zfs filesystem, I am unable to execute a command like this: > > # touch lili > # chflags sappnd lili > # ls -lrto lili > -rw-r--r-- 1 root wheel sappnd 5 Nov 17 12:38 lili > # echo "lala" >> lili > # echo "lala" >> lili > -su: echo: write error: Operation not permitted > > So, the first time it worked, but it stops working on any consequent time (when the file is no more empty). > I found a bug report on: > > http://www.freebsd.org/cgi/query-pr.cgi?pr=149495 And: http://www.freebsd.org/cgi/query-pr.cgi?pr=151082&cat=kern > where a patch is suggested. Nevertheless, even though my sources are newer than the suggested patch, my source tree does not contain it. > Do we know anything more about it? The fix was committed to CURRENT on Oct 8th (r213634). The commit message talks about MFC after a week, however to me it looks like the fix hasn't made it to 8-STABLE yet. Also, there seems to be a related commit r213673 which essentially reverts r213634 and has a more general approach to handling ioflags with zfs. This commit was on Oct 10th, again 1 week MFC grace period, again not in 8-STABLE yet, at least to my knowlegde. Maybe MFC was simply forgotten, maybe there's a good reason to delay it, I don't know. We're using my patch (the one mentioned in the PRs) for now and append-only works as intended. Applying the changes in r213673 to 8-STABLE might be an option too, if you're considering patching to get the append flag working. Anyway, hopefully one of these fixes gets MFCd to 8-STABLE soon. Markus
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