linux-kernel - Re: ext2 on flash memory

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Message-ID: <466D379C.6000809@wpkg.org>
Date:	Mon, 11 Jun 2007 13:53:00 +0200
From:	Tomasz Chmielewski <mangoo@...g.org>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	maxdamage@...din.ro
Subject: Re: ext2 on flash memory

Eduard-Gabriel Munteanu wrote:

(...)

> Your USB pendrive will wear faster if you use an inappropriate 
> filesystem. Such filesystems require frequent writes and change their 
> internal state often.
> 
> This could be alleviated by COWing the filesystem somehow and flushing 
> writes when you're finished. But the modifications will be lost if 
> crashes occur. The filesystem structures will still change a lot and 
> require  big writes to update it.
> 
> Really, why don't you try a more suitable fs for your pendrive, one that 
> changes itself less than usual fs's?

Hmm, are there any fs (read+write) alternatives for pendrives?

jffs2 only works on mtd devices, and that excludes pendrives, which are 
block devices. I know LogFS will work with block devices one day, but 
currently, it doesn't (and is not in the kernel yet as well).


Also, ext2 provides a nice feature other filesystems lack: xip. 
Especially, if a pendrive is used as a rootfs for a small device.


-- 
Tomasz Chmielewski
http://wpkg.org
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