linux-ext4 - Re: [PATCH] ext4: Enable delalloc and mballoc by default.

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Message-ID: <471FB5F8.1090805@redhat.com>
Date:	Wed, 24 Oct 2007 16:15:36 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Andreas Dilger <adilger@....com>
CC:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext4: Enable delalloc and mballoc by default.

Andreas Dilger wrote:
> 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.

Right, I understand the reason for noextents, nodelalloc, nomballoc.
Above, I ask what is the point of having the *defaults* (extents,
delalloc, mballoc) as mount options?

-Eric
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