linux-ext4 - Re: [RFC 4/5] MMC: Adjust unaligned write accesses.

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Message-Id: <201103212005.37108.arnd@arndb.de>
Date:	Mon, 21 Mar 2011 20:05:37 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Andreas Dilger <adilger@...ger.ca>
Cc:	Andrei Warkentin <andreiw@...orola.com>, linux-mmc@...r.kernel.org,
	linux-ext4@...r.kernel.org
Subject: Re: [RFC 4/5] MMC: Adjust unaligned write accesses.

On Monday 21 March 2011 19:03:09 Andreas Dilger wrote:
> Note that mballoc was specifically designed to handle allocation
> requests that are aligned on RAID stripe boundaries, so it should
> be able to handle this for MMC as well.  What is needed is to tell
> the filesystem what the underlying alignment is.  That can be done
> at format time with mke2fs or afterward with tune2fs by using the
> "-E stripe_width" option.

Ah, that sounds useful. So would I set the stripe_width to the
erase block size, and the block group size to a multiple of that?

Does this also work in (rare) cases where the erase block size is
not a power of two?

	Arnd
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