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Date: Sat, 29 Oct 2016 16:08:31 +0800 From: Ming Lei <tom.leiming@...il.com> To: Jens Axboe <axboe@...com>, linux-kernel@...r.kernel.org Cc: linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org, Christoph Hellwig <hch@...radead.org>, "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>, Ming Lei <tom.leiming@...il.com>, Johannes Berg <johannes.berg@...el.com> Subject: [PATCH 32/60] block: implement sp version of bvec iterator helpers This patch implements singlepage version of the following 3 helpers: - bvec_iter_offset_sp() - bvec_iter_len_sp() - bvec_iter_page_sp() So that one multipage bvec can be splited to singlepage bvec, and make users of current bvec iterator happy. Signed-off-by: Ming Lei <tom.leiming@...il.com> --- include/linux/bvec.h | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) diff --git a/include/linux/bvec.h b/include/linux/bvec.h index da984fa171bc..12c53a0eee52 100644 --- a/include/linux/bvec.h +++ b/include/linux/bvec.h @@ -22,6 +22,7 @@ #include <linux/kernel.h> #include <linux/bug.h> +#include <linux/mm.h> /* * What is multipage bvecs(segment)? @@ -95,15 +96,25 @@ struct bvec_iter { #define bvec_iter_offset_mp(bvec, iter) \ (__bvec_iter_bvec((bvec), (iter))->bv_offset + (iter).bi_bvec_done) +#define bvec_iter_page_idx_mp(bvec, iter) \ + (bvec_iter_offset_mp((bvec), (iter)) / PAGE_SIZE) + /* * <page, offset,length> of sp segment. * * This helpers will be implemented for building sp bvec in flight. * */ -#define bvec_iter_offset_sp(bvec, iter) bvec_iter_offset_mp((bvec), (iter)) -#define bvec_iter_len_sp(bvec, iter) bvec_iter_len_mp((bvec), (iter)) -#define bvec_iter_page_sp(bvec, iter) bvec_iter_page_mp((bvec), (iter)) +#define bvec_iter_offset_sp(bvec, iter) \ + (bvec_iter_offset_mp((bvec), (iter)) % PAGE_SIZE) + +#define bvec_iter_len_sp(bvec, iter) \ + min_t(unsigned, bvec_iter_len_mp((bvec), (iter)), \ + (PAGE_SIZE - (bvec_iter_offset_sp((bvec), (iter))))) + +#define bvec_iter_page_sp(bvec, iter) \ + nth_page(bvec_iter_page_mp((bvec), (iter)), \ + bvec_iter_page_idx_mp((bvec), (iter))) /* current interfaces support sp style at default */ #define bvec_iter_page(bvec, iter) bvec_iter_page_sp((bvec), (iter)) -- 2.7.4
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