Re: [PATCH 2/3] fscache/cachefiles: optionally use SEEK_DATA instead of ->bmap.

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To: NeilBrown <neilb@xxxxxxx>
Subject: Re: [PATCH 2/3] fscache/cachefiles: optionally use SEEK_DATA instead of ->bmap.
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Sun, 19 Apr 2015 23:08:18 -0700
Cc: David Howells <dhowells@xxxxxxxxxx>, Chris Mason <clm@xxxxxx>, Al Viro <viro@xxxxxxxxxxxxxxxxxx>, Josef Bacik <jbacik@xxxxxx>, David Sterba <dsterba@xxxxxxx>, linux-cachefs@xxxxxxxxxxxxxxx, Dave Chinner <david@xxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-btrfs@xxxxxxxxxxxxxxx
In-reply-to: <20150420052752.26554.52672.stgit@notabene.brown>
User-agent: Mutt/1.5.23 (2014-03-12)

Please just usse SEEK_HOLE/DATA support unconditioanlly.  ->bmap is a
horrible hack that is completely unsafe.

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References:
- [PATCH 0/3] Allow fscache to work on BTRFS
  - From: NeilBrown
- [PATCH 2/3] fscache/cachefiles: optionally use SEEK_DATA instead of ->bmap.
  - From: NeilBrown

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