linux-kernel - Re: [PATCH v4] drivers/block/mtip32xx: Adding new driver mtip32xx

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Message-ID: <20110913124906.GA17855@infradead.org>
Date:	Tue, 13 Sep 2011 08:49:06 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	"Sam Bradshaw (sbradshaw)" <sbradshaw@...ron.com>
Cc:	jaxboe@...ionio.com, alan@...rguk.ukuu.org.uk, hch@...radead.org,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jeff Garzik <jgarzik@...ox.com>, jmoyer@...hat.com,
	"Asai Thambi Samymuthu Pattrayasamy (asamymuthupa) [CONTRACTOR]" 
	<asamymuthupa@...ron.com>
Subject: Re: [PATCH v4] drivers/block/mtip32xx: Adding new driver mtip32xx

Btw, there is another _huge_ issue with the driver, and that is the
lack of any internal queueing.  Remember the make_request interface is
an extremly thin layer (or rather the lack of it) below the filesystem.

So for example if eh_active is non-zero you return -EBUSY to the
filesystems.  That's an error code it a) doesn't recognize and b)
couldn't handle even if it did.  Similarly mtip_hw_get_scatterlist
simply blocks if no tag is currently available instead of queueing
it up.
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