linux-kernel - Re: [RFC] new ->perform

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Message-ID: <20100521151518.GA12752@infradead.org>
Date:	Fri, 21 May 2010 11:15:18 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Dave Chinner <david@...morbit.com>, Josef Bacik <josef@...hat.com>,
	linux-fsdevel@...r.kernel.org, chris.mason@...cle.com,
	hch@...radead.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] new ->perform_write fop

Nick, what exactly is the problem with the reserve + allocate design?

In a delalloc filesystem (which is all those that will care about high
performance large writes) the write path fundamentally consists of those
two operations.  Getting rid of the get_blocks mess and replacing it
with a dedicated operations vector will simplify things a lot.

Punching holes is a rather problematic operation, and as mentioned not
actually implemented for most filesystems - just decrementing counters
on errors increases the chances that our error handling will actually
work massively.

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