linux-kernel - Re: [PATCH 2/3] fscache/cachefiles: optionally use SEEK

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Date:	Mon, 20 Apr 2015 12:21:42 +0100
From:	David Howells <dhowells@...hat.com>
To:	NeilBrown <neilb@...e.de>
Cc:	dhowells@...hat.com, Chris Mason <clm@...com>,
	Al Viro <viro@...IV.linux.org.uk>, Josef Bacik <jbacik@...com>,
	David Sterba <dsterba@...e.cz>, linux-cachefs@...r.kernel.org,
	Dave Chinner <david@...morbit.com>,
	linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	linux-fsdevel@...r.kernel.org, linux-btrfs@...r.kernel.org
Subject: Re: [PATCH 2/3] fscache/cachefiles: optionally use SEEK_DATA instead of ->bmap.

NeilBrown <neilb@...e.de> wrote:

> @@ -721,24 +733,45 @@ int cachefiles_read_or_alloc_pages(struct fscache_retrieval *op,

We can actually do better than this what you've done here for
cachefiles_read_or_alloc_pages().  We can use SEEK_DATA to check the beginning
of a run of pages and then SEEK_HOLE to see how many pages are covered.

David
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