On Mon 25-01-16 10:03:23, Mel Gorman wrote:
> do_read_cache_page and __read_cache_page duplicates page filler code
> when filling the page for the first time. This patch simply removes the
> duplicate logic.
>
> Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Looks good to me. You can add:
Reviewed-by: Jan Kara <jack@xxxxxxx>
Honza
> ---
> mm/filemap.c | 43 ++++++++++++-------------------------------
> 1 file changed, 12 insertions(+), 31 deletions(-)
>
> diff --git a/mm/filemap.c b/mm/filemap.c
> index bc943867d68c..aa38593d0cd5 100644
> --- a/mm/filemap.c
> +++ b/mm/filemap.c
> @@ -2283,7 +2283,7 @@ static struct page *wait_on_page_read(struct page *page)
> return page;
> }
>
> -static struct page *__read_cache_page(struct address_space *mapping,
> +static struct page *do_read_cache_page(struct address_space *mapping,
> pgoff_t index,
> int (*filler)(void *, struct page *),
> void *data,
> @@ -2305,31 +2305,19 @@ static struct page *__read_cache_page(struct address_space *mapping,
> /* Presumably ENOMEM for radix tree node */
> return ERR_PTR(err);
> }
> +
> +filler:
> err = filler(data, page);
> if (err < 0) {
> page_cache_release(page);
> - page = ERR_PTR(err);
> - } else {
> - page = wait_on_page_read(page);
> + return ERR_PTR(err);
> }
> - }
> - return page;
> -}
> -
> -static struct page *do_read_cache_page(struct address_space *mapping,
> - pgoff_t index,
> - int (*filler)(void *, struct page *),
> - void *data,
> - gfp_t gfp)
> -
> -{
> - struct page *page;
> - int err;
>
> -retry:
> - page = __read_cache_page(mapping, index, filler, data, gfp);
> - if (IS_ERR(page))
> - return page;
> + page = wait_on_page_read(page);
> + if (IS_ERR(page))
> + return page;
> + goto out;
> + }
> if (PageUptodate(page))
> goto out;
>
> @@ -2337,21 +2325,14 @@ static struct page *do_read_cache_page(struct address_space *mapping,
> if (!page->mapping) {
> unlock_page(page);
> page_cache_release(page);
> - goto retry;
> + goto repeat;
> }
> if (PageUptodate(page)) {
> unlock_page(page);
> goto out;
> }
> - err = filler(data, page);
> - if (err < 0) {
> - page_cache_release(page);
> - return ERR_PTR(err);
> - } else {
> - page = wait_on_page_read(page);
> - if (IS_ERR(page))
> - return page;
> - }
> + goto filler;
> +
> out:
> mark_page_accessed(page);
> return page;
> --
> 2.6.4
>
--
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR
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