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Date: Wed, 13 Mar 2002 09:14:22 +0100
From: bert hubert <ahu@ds9a.nl>
To: Jeff Garzik <jgarzik@mandrakesoft.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
        Linus Torvalds <torvalds@transmeta.com>,
        Bill Davidsen <davidsen@tmr.com>, LKML <linux-kernel@vger.kernel.org>
Subject: ide filters / 'ide dump' / 'bio dump'
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	Jeff Garzik <jgarzik@mandrakesoft.com>,
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In-Reply-To: <3C8D6CA4.8060604@mandrakesoft.com>; from jgarzik@mandrakesoft.com on Tue, Mar 12, 2002 at 02:51:07AM +0000
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On Tue, Mar 12, 2002 at 02:51:07AM +0000, Jeff Garzik wrote:

> The current implementation needs to be changed anyway :)  From "ATA raw 
> command" to "device raw command" at the very least.

Regarding proposed ATA filtering, this touches somewhat on something I've
been thinking about for a while: biodump.

Basically, biodump is to a block device what tcpdump is to a network
adaptor.

So we would be able to do this:

# biodump /dev/hda
09:09:33.023 READ block 12345 [10 blocks]
09:09:33.024 READ block 12355 [10 blocks]
09:09:33.025 READ block 12365 [10 blocks]
09:09:34.000 WRITE block 12345 [1 block]

Or somewhat more fancy, and only useful for non-growing files:

# biodump /var/db/bigdb/tablefile
file on /dev/hda, getting blockmap:
09:09:33.023 READ logical block 12345 [10 blocks]
09:09:33.024 READ logical block 12355 [10 blocks]
09:09:33.025 READ logical block 12365 [10 blocks]
09:09:34.000 WRITE logical block 12345 [1 block]

Because right now, we have no idea why that disk light is blinking. If
somebody implements a filter, it would be a natural place to also provide
a dumping hook.

biodump might in fact turn out to become atadump and scsidump (which is
rather sad actually).

regards,


bert

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