From: Josh Boyer <jwboyer@linux.vnet.ibm.com>
To: Seongsu Lee <senux@senux.com>
Cc: linux-mtd@lists.infradead.org
Subject: Re: write buffer for MTD devices?
Date: Mon, 09 Jul 2007 08:18:54 -0500 [thread overview]
Message-ID: <1183987134.14824.4.camel@weaponx.rchland.ibm.com> (raw)
In-Reply-To: <20070705043604.GA10478@pooky.senux.com>
On Thu, 2007-07-05 at 13:36 +0900, Seongsu Lee wrote:
> Hi,
>
> You know that block devices such as hard disk has write buffer
> in hard disk itself to speed up the write performance.
> (The write buffer speed up when it works in write-back mode.)
>
> My questions are: (only for NAND flash memory)
>
> 1) Then, does MTD devices has write buffer in device itself?
The mtdblock driver does. It caches one eraseblock. JFFS2 also has a
write buffer. Other than that, no.
> 2) If ret->mtd->write() returns OK, is the data sent by user
> successfully written on flash memory media? (not cache or
> buffer)
Depends. If the write is being done to an mtdblock, then it is written
to the cache. If it's being done to a "real" device, then it should be
written to flash.
> Any comments, related matrials or URLs are needed.
It's all in the code.
josh
prev parent reply other threads:[~2007-07-09 13:21 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-05 4:36 write buffer for MTD devices? Seongsu Lee
2007-07-09 13:18 ` Josh Boyer [this message]
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