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Re: How to use increased number of ACL entries?

To: "Michael L. Semon" <mlsemon35@xxxxxxxxx>
Subject: Re: How to use increased number of ACL entries?
From: Kasparek Tomas <kasparek@xxxxxxxxxxxx>
Date: Mon, 4 Nov 2013 16:05:49 +0100
Cc: Jeff Liu <jeff.liu@xxxxxxxxxx>, Eric Sandeen <sandeen@xxxxxxxxxxx>, xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <52773607.30506@xxxxxxxxx>
References: <20131103081704.GE9974@xxxxxxxxxxxx> <20131104003915.GN6188@dastard> <5277086E.6030905@xxxxxxxxxxx> <52771FFE.8030009@xxxxxxxxx> <527723FC.1070401@xxxxxxxxxx> <52773607.30506@xxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Mon, Nov 04, 2013 at 12:52:07AM -0500, Michael L. Semon wrote:
> >>> but the 3.10.x kernel you're running will IIRC; use "-m crc=1" on the 
> >>> mkfs.xfs
> >>> commandline from a git mkfs.xfs.

Did tried and ended with the same problem for filesystem mounting.
> >> root@bpserver:/storage/devel/git-xfsprogs# mkfs/mkfs.xfs -f -m crc=1 
> >> /dev/sdb3

> >> However, it should be dirent (ftype=1 in the above output) that keeps a 
> >> vanilla 3.10.17 kernel from mounting the resulting filesystem:
> >>
> >> [438326.624667] XFS (sdb3): Version 5 superblock detected. This kernel has 
> >> EXPERIMENTAL support enabled!
> >> [438326.624667] Use of these features in this kernel is at your own risk!
> >> [438326.624762] XFS (sdb3): Superblock has unknown incompatible features 
> >> (0x1) enabled.
> >> [438326.624762] Filesystem can not be safely mounted by this kernel.
> > 
> > looks this problem is irrelevant to CRC check is enabled or not, and
> > Eric has fixed it:
> > 
> > commit 31625f28ad7be67701dc4cefcf52087addd88af4
> >     xfs: don't emit corruption noise on fs probes

Will try this.

> >> I don't know if the CentOS kernel has any extra patches that would enable 
> >> this filesystem to be mounted.
I use vanilla longterm 3.10.x, not CentOS kernel, that is too old for my

> >> There might be a way to bisect or revert the git xfsprogs back before 
> >> dirent 
> >> and giving that a try.  However, it seems best to start working with 
> >> v5/CRC 
> >> XFS starting with kernel 3.11.  If my luck with recent AIO commits was 
> >> better, 
> >> I'd recommend 3.12 instead because that's the real correct answer, 
> >> problems 
> >> aside.

I have to use longterm kernel and 3.10.x is the latest available. As I have
seen the commit for more ACLs there, I expected it should be possible to
get it working for this version 

> That stated, I found some time to revert the git xfsprogs, and there was
> success in making more than 25 ACLs on vanilla kernel 3.10.17.  Again,
> this is not recommended--the later kernel and userspace patches are there
> for good reason--but the output is pasted after my closing.

I will repeat your directions and test it. However, if you as XFS devels do
not see these to be stable enough to be used in production environment, I
may still revert to some other solution (unix groups) even if these are a
night mare to administer for my situation.

Thanks for all the info and advices.



  Tomas Kasparek               E-mail: kasparek@xxxxxxxxxxxx
  CVT FIT VUT Brno, L127       Web:    http://www.fit.vutbr.cz/~kasparek
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