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[PATCH 04/17] md: introduce helpers for dealing with fetch/store preallocated pages in bio

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Both raid1 and raid10 uses bio's bvec table to store pre-allocated
pages, then fetch and add it to bio.

This patch introduces two helpers for dealing with the special case,
like what bio_iov_iter_get_pages() does.

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
---
 drivers/md/md.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/md/md.h b/drivers/md/md.h
index a86ad62079de..21897cb514af 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -708,4 +708,25 @@ static inline void mddev_clear_unsupported_flags(struct mddev *mddev,
 {
 	mddev->flags &= ~unsupported_flags;
 }
+
+/*
+ * Both raid1 and raid10 use bio's bvec table to store the preallocated
+ * pages, so we introduces the following helpers for this kind of usage.
+ *
+ * Actually the usage is a bit similar with bio_iov_iter_get_pages().
+ *
+ * Please make sure .bi_io_vec[idx] points to one unused vector by the
+ * bio.
+ */
+static inline struct page *mdev_get_page_from_bio(struct bio *bio, unsigned idx)
+{
+	return bio->bi_io_vec[idx].bv_page;
+}
+
+static inline void mdev_put_page_to_bio(struct bio *bio, unsigned idx,
+					struct page *page)
+{
+	bio->bi_io_vec[idx].bv_page = page;
+}
+
 #endif /* _MD_MD_H */
-- 
2.7.4

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[PATCH 00/17] md: cleanup on direct access to bvec table  Ming Lei <tom.leiming@gmail.com> - 2017-02-16 12:50 +0100
  [PATCH 17/17] md: raid10: avoid direct access to bvec table in handle_reshape_read_error Ming Lei <tom.leiming@gmail.com> - 2017-02-16 12:50 +0100
  [PATCH 16/17] md: raid10: avoid direct access to bvec table in reshape_request Ming Lei <tom.leiming@gmail.com> - 2017-02-16 12:50 +0100
  [PATCH 08/17] md: raid1: simplify r1buf_pool_free() Ming Lei <tom.leiming@gmail.com> - 2017-02-16 12:50 +0100
  [PATCH 09/17] md: raid1/raid10: use bio helper in *_pool_free Ming Lei <tom.leiming@gmail.com> - 2017-02-16 13:00 +0100
  [PATCH 06/17] md: raid1/raid10: borrow .bi_error as pre-allocated page index Ming Lei <tom.leiming@gmail.com> - 2017-02-16 13:00 +0100
  [PATCH 04/17] md: introduce helpers for dealing with fetch/store preallocated pages in bio Ming Lei <tom.leiming@gmail.com> - 2017-02-16 13:00 +0100
  [PATCH 01/17] block: introduce bio_segments_all() Ming Lei <tom.leiming@gmail.com> - 2017-02-16 13:00 +0100
  Re: [PATCH 00/17] md: cleanup on direct access to bvec table Shaohua Li <shli@kernel.org> - 2017-02-16 23:20 +0100
    Re: [PATCH 00/17] md: cleanup on direct access to bvec table Ming Lei <tom.leiming@gmail.com> - 2017-02-17 02:30 +0100
      Re: [PATCH 00/17] md: cleanup on direct access to bvec table Shaohua Li <shli@kernel.org> - 2017-02-17 05:20 +0100

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