linux-kernel - Re: [PATCH v7 18/22] xip: Add xip_zero_page

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Message-ID: <20140410142729.GL5727@linux.intel.com>
Date:	Thu, 10 Apr 2014 10:27:29 -0400
From:	Matthew Wilcox <willy@...ux.intel.com>
To:	Jan Kara <jack@...e.cz>
Cc:	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Ross Zwisler <ross.zwisler@...ux.intel.com>
Subject: Re: [PATCH v7 18/22] xip: Add xip_zero_page_range

On Wed, Apr 09, 2014 at 12:15:12PM +0200, Jan Kara wrote:
> > +		/*
> > +		 * ext4 sometimes asks to zero past the end of a block.  It
> > +		 * really just wants to zero to the end of the block.
> > +		 */
>   Then we should really fix ext4 I believe...

Since I didn't want to do this ...

> > +/* Can't be a function because PAGE_CACHE_SIZE is defined in pagemap.h */
> > +#define dax_truncate_page(inode, from, get_block)	\
> > +	dax_zero_page_range(inode, from, PAGE_CACHE_SIZE, get_block)
>                                          ^^^^
> This should be (PAGE_CACHE_SIZE - (from & (PAGE_CACHE_SIZE - 1))), shouldn't it?

... I could get away without doing that ;-)
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