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Date:      Thu, 11 Mar 2010 14:08:07 +0100
From:      Pawel Jakub Dawidek <pjd@FreeBSD.org>
To:        Michiel Detailleur <md@scoutsengidsenvlaanderen.be>
Cc:        freebsd-fs@freebsd.org
Subject:   Re: [Spam? ] Re: ZFS snapshot name length limit? (File name too long)
Message-ID:  <20100311130807.GJ2350@garage.freebsd.pl>
In-Reply-To: <4B98E95B.90806@scoutsengidsenvlaanderen.be>
References:  <4B97A963.9040300@scoutsengidsenvlaanderen.be> <20100310174411.GE1715@garage.freebsd.pl> <4B98E95B.90806@scoutsengidsenvlaanderen.be>

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On Thu, Mar 11, 2010 at 02:00:11PM +0100, Michiel Detailleur wrote:
> >From looking at the code, I think you hitting this limit:
> >
> >This is FreeBSD limit caused by statfs structure:
> >
> >/*
> > * filesystem statistics
> > */
> >[...]
> >#define MNAMELEN        88              /* size of on/from name bufs */
> >[...]
> >
> >ZFS mounts snapshots on lookup and this is this mount that fails.
> > =20
> So all that would need to be done to allow mounting snapshots with=20
> longer names would be to increase this value? (I'm not a C programmer,=20
> so bear with me :) )

Such change will break ABI compatibility with tools compiled on previous
FreeBSD versions. As you can see in sys/sys/mount.h this is the reason
we still keep ostatfs structure. I'll discuss the possibilities with
other FreeBSD committers and we will see what we can do about it.

--=20
Pawel Jakub Dawidek                       http://www.wheelsystems.com
pjd@FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!

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