linux-kernel - Re: [PATCH 4/14] tmpfs: add shmem_read_mapping_page

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Message-ID: <alpine.LSU.2.00.1106010958390.23468@sister.anvils>
Date:	Wed, 1 Jun 2011 10:02:32 -0700 (PDT)
From:	Hugh Dickins <hughd@...gle.com>
To:	Christoph Hellwig <hch@...radead.org>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 4/14] tmpfs: add shmem_read_mapping_page_gfp

On Tue, 31 May 2011, Christoph Hellwig wrote:
> > (shmem_read_mapping_page_gfp or shmem_read_cache_page_gfp?  Generally
> > the read_mapping_page functions use the mapping's ->readpage, and the
> > read_cache_page functions use the supplied filler, so I think
> > read_cache_page_gfp was slightly misnamed.)
> 
> What about just shmem_read_page?  It's not using the pagecache, so
> no need for the mapping or cache, and the _gfp really is just a hack
> because the old pagecache APIs didn't allow to pass the gfp flags.
> For a new API there's no need for that.

I am trying to mirror what's already there, and it's conceivable that
we'll find others who want converting from read_mapping_page() to
shmem_read_mapping_page(), so I'd rather keep the similar naming.

The _gfp() thing I'm not very keen on, but can't avoid it for i915.
If anyone else needs something here, it's likely to be without _gfp().

> 
> > +static inline struct page *shmem_read_mapping_page(
> > +				struct address_space *mapping, pgoff_t index)
> > +{
> > +	return shmem_read_mapping_page_gfp(mapping, index,
> > +				mapping_gfp_mask(mapping));
> > +}
> 
> This really shouldn't be in pagemap.h.  For now probably in shmem_fs.h

Okay, I can move it there, if I do the same for those shmem_...()
interfaces currently in linux/mm.h too.

Hugh
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