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Date:	Wed, 24 Oct 2007 15:06:39 -0600
From:	Andreas Dilger <>
To:	Eric Sandeen <>
Cc:	"Aneesh Kumar K.V" <>,
Subject: Re: [PATCH] ext4: Enable delalloc and mballoc by default.

On Oct 24, 2007  12:22 -0500, Eric Sandeen wrote:
> Aneesh Kumar K.V wrote:
> > @@ -1279,6 +1280,9 @@ clear_qf_name:
> >  		case Opt_delalloc:
> >  			set_opt (sbi->s_mount_opt, DELALLOC);
> >  			break;
> If delalloc, mballoc, extents are the new defaults, is there a reason to
> keep them as options?  When would you need to specify -o extents, now,
> for example?  (though my brain is fuzzy today, maybe I'm missing
> something)  If this were not a filesystem ending in "dev" I could see
> keeping it for compatibility with existing fstabs....

It is useful to be able to mount w/o extents/delalloc/mballoc for perf
testing and functional testing of the block-mapped file path in ext4.
Also, some users might want the ability to use features of ext4 w/o
the incompatibility of extents.

> >  	set_opt(sbi->s_mount_opt, EXTENTS);
> > +	set_opt(sbi->s_mount_opt, DELALLOC);
> > +	set_opt(sbi->s_mount_opt, MBALLOC);

I think the other thing to do is enable the INCOMPAT_EXTENTS flag in
mkfs.ext4 by default, so that extents is enabled/disabled in the
same manner as other ext* features.  We can remove the above once
we have an e2fsprogs that specifically sets all of the ext4 features
(large inodes, etc) for ext4 filesystems.

Cheers, Andreas
Andreas Dilger
Sr. Software Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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