From: Theodore Ts'o <tytso@mit.edu>
To: Lukas Czerner <lczerner@redhat.com>
Cc: linux-ext4@vger.kernel.org
Subject: Re: [PATCH] mke2fs: Disallow bigalloc with with bs < 4096
Date: Wed, 3 Apr 2013 10:35:54 -0400 [thread overview]
Message-ID: <20130403143554.GA13668@thunk.org> (raw)
In-Reply-To: <1364997099-22590-1-git-send-email-lczerner@redhat.com>
On Wed, Apr 03, 2013 at 03:51:39PM +0200, Lukas Czerner wrote:
> Currently there is nothing preventing user to create file system with
> bigalloc feature enabled and block size smaller than 4096 Bytes. However
> such combination does not make much sense at all because the whole point
> of bigalloc is to have bigger allocation units.
>
> This patch disallow such combination.
This makes sense by default but I do see a point in allowing it for
testing purposes --- specifically, it allows us to verify that
bigalloc works on architectures such as PowerPC and Itanium where page
size is greater than the 4k block size. So maybe a developer mode set
via mke2fs.conf?
Another option would be to enforce that we only support bigalloc file
systems where the blocksize == pagesize, but that means we wouldn't be
able to mount 4k bigalloc file systems on architectures with a 8k or
16k page size.
- Ted
next prev parent reply other threads:[~2013-04-03 14:35 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-03 13:51 [PATCH] mke2fs: Disallow bigalloc with with bs < 4096 Lukas Czerner
2013-04-03 14:35 ` Theodore Ts'o [this message]
2013-04-03 14:47 ` Lukáš Czerner
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