linux-kernel - Re: [PATCH v12 09/20] dax,ext2: Replace xip_truncate_page with dax_truncate

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Message-ID: <20150113215505.GL5661@wil.cx>
Date:	Tue, 13 Jan 2015 16:55:05 -0500
From:	Matthew Wilcox <willy@...ux.intel.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, willy@...ux.intel.com
Subject: Re: [PATCH v12 09/20] dax,ext2: Replace xip_truncate_page with
 dax_truncate_page

On Mon, Jan 12, 2015 at 03:09:58PM -0800, Andrew Morton wrote:
> > + * Similar to block_truncate_page(), this function can be called by a
> > + * filesystem when it is truncating an DAX file to handle the partial page.
> > + *
> > + * We work in terms of PAGE_CACHE_SIZE here for commonality with
> > + * block_truncate_page(), but we could go down to PAGE_SIZE if the filesystem
> > + * took care of disposing of the unnecessary blocks.
> 
> But PAGE_SIZE==PAGE_CACHE_SIZE.  Unclear what you're saying here.

The last I heard, some people were trying to resurrect the PAGE_CACHE_SIZE
> PAGE_SIZE patches.  I'd be grateful if the distinction between PAGE_SIZE
and PAGE_CACHE_SIZE went away, tbh.
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