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    SubjectRe: [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.


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