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Re: [PATCH 00/11] xfs: fixes for 3.10-rc3

To: Ben Myers <bpm@xxxxxxx>
Subject: Re: [PATCH 00/11] xfs: fixes for 3.10-rc3
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Wed, 22 May 2013 06:24:45 +1000
Cc: xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20130521162647.GD19505@xxxxxxx>
References: <1369123330-9579-1-git-send-email-david@xxxxxxxxxxxxx> <20130521162647.GD19505@xxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Tue, May 21, 2013 at 11:26:47AM -0500, Ben Myers wrote:
> Hi Dave,
> On Tue, May 21, 2013 at 06:01:59PM +1000, Dave Chinner wrote:
> > This is my current kernel bug fix patch series. I've updated it
> > against a current xfsdev tree, and contains all the fixes mentioned
> > in the "fixes for 3.10-rc2 (updated)" thread. The first 7 patches
> > are patches from that series. The last 4 are new patches.
> >
> > The first new patch stops CRC enabled filesystems from spamming the
> > log. It currently emits an "Experimental" warning ever time the
> > superblock is written, which is typically every 30s.
> >
> > The second path ("rework remote attr CRCs") is the changes I
> > mentioned in the "fixes for 3.10-rc2 (updated)" thread. The code is
> > far more robust as a result of these changes, and I think we really
> > need to change the format as done in this patch. Once we have
> > decided on the way forward, I'll port this to userspace.
> > 
> > The third patch fixes a remote symlink problem - I didn't hit this
> > until I'd redone the remote attr CRCs and the 1k block size
> > filesystem testing made it passed the attribute tests it was failing
> > on.
> > 
> > Finally, the last patch is another on-disk format change - one that
> > removes the 25 entry limit on ACLs. It doesn't invalidate anything
> > that is already on disk, just allows ACLs on v5 superblock
> > filesystems to store more than 25 ACLs in an xattr. In fact, it
> > allows (65536 - 4) / 12 = 5461 entries to be stored in a single
> > ACL, so I don't see anyone running out on v5 superblocks....
> > 
> > Thoughts, comments?
> I'll look into these but I am concerned that we're starting to get into 3.11
> territory.

The moment we release the first kernel with the format in it, we
need to use feature bits for on-disk format changes, experimental
tag or not. Hence IMO this needs to be fixed before an initial

It's not a huge change from a code perspective, and it's a lot more
reliable in my testing....


Dave Chinner

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