linux-kernel - Re: [RFC/PATCH] - revert generic_fillattr stat->blksize to PAGE_CACHE

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Message-ID: <20061107000840.GF6012@schatzie.adilger.int>
Date:	Mon, 6 Nov 2006 17:08:40 -0700
From:	Andreas Dilger <adilger@...sterfs.com>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Theodore Tso <tytso@....edu>
Subject: Re: [RFC/PATCH] - revert generic_fillattr stat->blksize to PAGE_CACHE_SIZE

On Nov 06, 2006  17:15 -0600, Eric Sandeen wrote:
> Christoph Hellwig wrote:
> > I agree with the conclusion, but the patch is incomplete.  You went down
> > all the way to find out what the fileystems do in this messages, so add
> > the hunks to override the defaults for non-standard filesystems to the
> > patch aswell to restore the pre-inode diet state.
> 
> Well, agreed.  I put 80% or more back to pre-patch state, but not all.
> :)  So it's less broken with my patch than without, so at least it's
> moving forward.  So... Ted's patches get in w/o fixing up all the other
> filesystems (left as an exercise to the patch reader) but mine can't? :)

Actually, rather than blindly revert to pre-patch behaviour it would be
worthwhile to determine if PAGE_SIZE isn't the better value.  In some
cases people don't understand that i_blksize is the "optimal IO size"
and instead assume it is the filesystem blocksize.  I saw a few that were
e.g. 512 and that can't be very useful.

Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

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