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From: Martin Steigerwald <Martin@lichtvoll.de>
To: xfs@oss.sgi.com
Cc: Christoph Hellwig <hch@infradead.org>,
	Eric Sandeen <sandeen@sandeen.net>,
	Chris Walker <christopher.walker@gmail.com>
Subject: Re: quick question about filename length
Date: Sat, 16 May 2009 23:42:19 +0200	[thread overview]
Message-ID: <200905162342.19915.Martin@lichtvoll.de> (raw)
In-Reply-To: <20090516202511.GA28186@infradead.org>

Am Samstag 16 Mai 2009 schrieb Christoph Hellwig:
> On Sat, May 16, 2009 at 02:06:22PM -0400, Chris Walker wrote:
> > Thanks for you quick reply, Eric.
> >
> > I have a user who is having filenames (path+filename) cut off at 255
> > characters midway through a simulation -- but the problem must be
> > elsewhere
>
> XFS doesn't actually see the whole filename in normal operation (except
> for copying out the data out of symbolic links), as the resolution to
> individual components is done by the VFS.   Long file name should work
> just fine on Linux and do in my test.  Maybe some buffer is sized using
> incorrect in userspace?

And while a link name itself also can't be longer than about 256 
characters (I only tested 250 and 260), a link can point to a longer 
path ;-):

martin@shambhala:~/Zeit> mkdir -p 
$(ruby -e 'puts "1234567890"*25')/$(ruby -e 'puts "1234567890"*25')
martin@shambhala:~/Zeit> ln -s 
$(ruby -e 'puts "1234567890"*25')/$(ruby -e 'puts "1234567890"*25') 
testlink
martin@shambhala:~/Zeit> ls -l testlink
lrwxrwxrwx 1 martin martin 501 16. Mai 23:40 testlink -> 
12345678901234567890123456789012345678901234567890123456789[...]
martin@shambhala:~/Zeit> (df -hT . | grep -q xfs) && echo "Is XFS"
Is XFS

-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7

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      reply	other threads:[~2009-05-16 21:41 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-05-16 16:15 quick question about filename length Chris Walker
2009-05-16 17:04 ` Eric Sandeen
2009-05-16 18:06   ` Chris Walker
2009-05-16 20:25     ` Christoph Hellwig
2009-05-16 21:42       ` Martin Steigerwald [this message]

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