Re: [PATCH 2/2] afs: Add metadata xattrs

From: Jeffrey Altman
Date: Sat Jul 08 2017 - 22:46:45 EST

On 7/8/2017 9:01 PM, Theodore Ts'o wrote:
> On Sat, Jul 08, 2017 at 12:44:54PM -0700, Linus Torvalds wrote:
>> Yeah, I think attributes are likely much better than some random crazy
>> ioctl interface. They can be listed with generic tools, and have
>> various scripting interfaces in ways that ioctl's do not sanely have.
> I personally don't have a particular problem with these xattrs. For
> one thing, they are read-only. You use them just to find out the AFS
> cell, the AFS "fid", and the AFS volume name.
> I think the place where people will start getting nervous is when we
> start adding "write-only" xattrs or where writing to an xattr causes a
> side-effect to take place.


The list of AFS pioctls and the proposed alternatives for kAFS are
listed at

While it is true that the majority of the proposed xattrs are read-only
properties of AFS objects (cell, volume, fid, servers, sec_class,
sec_mode) there is one exception that is read-write (acls). AuriStorFS
permits acls to be set per-file; there was some per-file acl work begun
for OpenAFS but it was never completed.

Is there an alternative for fetching and setting ACLs that should be

Jeffrey Altman

fn:Jeffrey Altman
org:AuriStor, Inc.
adr:Suite 6B;;255 West 94Th Street;New York;New York;10025-6985;United States
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Skype: jeffrey.e.altman=0D=0A=


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