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Groups > linux.kernel > #1706221
| From | Ming Lei <ming.lei@redhat.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH v3 19/49] block: implement sp version of bvec iterator helpers |
| Date | 2017-08-08 11:00 +0200 |
| Message-ID | <uc8wR-5yr-87@gated-at.bofh.it> (permalink) |
| References | <uc8n7-5sU-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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 <ming.lei@redhat.com>
---
include/linux/bvec.h | 18 +++++++++++++++---
1 file changed, 15 insertions(+), 3 deletions(-)
diff --git a/include/linux/bvec.h b/include/linux/bvec.h
index 1eaf7ca5cab3..d5f999a493de 100644
--- a/include/linux/bvec.h
+++ b/include/linux/bvec.h
@@ -23,6 +23,7 @@
#include <linux/kernel.h>
#include <linux/bug.h>
#include <linux/errno.h>
+#include <linux/mm.h>
/*
* What is multipage bvecs(segment)?
@@ -98,14 +99,25 @@ 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 singlepage(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))
--
2.9.4
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[PATCH v3 00/49] block: support multipage bvec Ming Lei <ming.lei@redhat.com> - 2017-08-08 10:50 +0200
[PATCH v3 10/49] dm: limit the max bio size as BIO_MAX_PAGES * PAGE_SIZE Ming Lei <ming.lei@redhat.com> - 2017-08-08 10:50 +0200
Re: [PATCH v3 10/49] dm: limit the max bio size as BIO_MAX_PAGES * PAGE_SIZE Christoph Hellwig <hch@infradead.org> - 2017-08-10 13:30 +0200
[PATCH v3 13/49] btrfs: comment on direct access bvec table Ming Lei <ming.lei@redhat.com> - 2017-08-08 10:50 +0200
[PATCH v3 08/49] block: comment on bio_alloc_pages() Ming Lei <ming.lei@redhat.com> - 2017-08-08 10:50 +0200
[PATCH v3 09/49] block: comment on bio_iov_iter_get_pages() Ming Lei <ming.lei@redhat.com> - 2017-08-08 10:50 +0200
Re: [PATCH v3 09/49] block: comment on bio_iov_iter_get_pages() Christoph Hellwig <hch@infradead.org> - 2017-08-10 13:30 +0200
[PATCH v3 07/49] bcache: comment on direct access to bvec table Ming Lei <ming.lei@redhat.com> - 2017-08-08 10:50 +0200
Re: [PATCH v3 07/49] bcache: comment on direct access to bvec table Coly Li <i@coly.li> - 2017-08-08 14:40 +0200
Re: [PATCH v3 07/49] bcache: comment on direct access to bvec table Christoph Hellwig <hch@infradead.org> - 2017-08-10 13:30 +0200
[PATCH v3 05/49] fs/buffer: comment on direct access to bvec table Ming Lei <ming.lei@redhat.com> - 2017-08-08 10:50 +0200
Re: [PATCH v3 05/49] fs/buffer: comment on direct access to bvec table Christoph Hellwig <hch@infradead.org> - 2017-08-10 13:20 +0200
[PATCH v3 12/49] btrfs: avoid to access bvec table directly for a cloned bio Ming Lei <ming.lei@redhat.com> - 2017-08-08 10:50 +0200
[PATCH v3 03/49] kernel/power/swap.c: comment on direct access to bvec table Ming Lei <ming.lei@redhat.com> - 2017-08-08 10:50 +0200
[PATCH v3 02/49] block: loop: comment on direct access to bvec table Ming Lei <ming.lei@redhat.com> - 2017-08-08 10:50 +0200
[PATCH v3 16/49] block: bounce: don't access bio->bi_io_vec in copy_to_high_bio_irq Ming Lei <ming.lei@redhat.com> - 2017-08-08 10:50 +0200
[PATCH v3 15/49] bvec_iter: introduce BVEC_ITER_ALL_INIT Ming Lei <ming.lei@redhat.com> - 2017-08-08 10:50 +0200
[PATCH v3 41/49] xfs: convert to bio_for_each_segment_all_sp() Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
Re: [PATCH v3 41/49] xfs: convert to bio_for_each_segment_all_sp() "Darrick J. Wong" <darrick.wong@oracle.com> - 2017-08-08 18:40 +0200
[PATCH v3 48/49] block: enable multipage bvecs Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
[PATCH v3 33/49] bcache: convert to bio_for_each_segment_all_sp() Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
Re: [PATCH v3 33/49] bcache: convert to bio_for_each_segment_all_sp() Coly Li <i@coly.li> - 2017-08-08 14:40 +0200
[PATCH v3 49/49] block: bio: pass segments to bio if bio_add_page() is bypassed Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
[PATCH v3 25/49] block: use bio_for_each_segment_mp() to map sg Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
[PATCH v3 37/49] fs/mpage: convert to bio_for_each_segment_all_sp() Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
Re: [PATCH v3 37/49] fs/mpage: convert to bio_for_each_segment_all_sp() Christoph Hellwig <hch@infradead.org> - 2017-08-10 14:20 +0200
[PATCH v3 28/49] block: introduce bvec_get_last_page() Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
[PATCH v3 34/49] md: raid1: convert to bio_for_each_segment_all_sp() Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
[PATCH v3 26/49] block: introduce bvec_for_each_sp_bvec() Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
[PATCH v3 44/49] exofs: convert to bio_for_each_segment_all_sp() Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
[PATCH v3 35/49] dm-crypt: don't clear bvec->bv_page in crypt_free_buffer_pages() Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
[PATCH v3 42/49] gfs2: convert to bio_for_each_segment_all_sp() Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
[PATCH v3 32/49] block: convert to singe/multi page version of bio_for_each_segment_all() Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
[PATCH v3 39/49] fs/iomap: convert to bio_for_each_segment_all_sp() Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
[PATCH v3 29/49] fs/buffer.c: use bvec iterator to truncate the bio Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
[PATCH v3 21/49] blk-merge: compute bio->bi_seg_front_size efficiently Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
Re: [PATCH v3 21/49] blk-merge: compute bio->bi_seg_front_size efficiently Christoph Hellwig <hch@infradead.org> - 2017-08-10 14:30 +0200
[PATCH v3 24/49] block: use bio_for_each_segment_mp() to compute segments count Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
[PATCH v3 43/49] f2fs: convert to bio_for_each_segment_all_sp() Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
[PATCH v3 23/49] block: blk-merge: remove unnecessary check Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
Re: [PATCH v3 23/49] block: blk-merge: remove unnecessary check Christoph Hellwig <hch@infradead.org> - 2017-08-10 14:20 +0200
[PATCH v3 27/49] block: bio: introduce single/multi page version of bio_for_each_segment_all() Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
[PATCH v3 46/49] fs/btrfs: convert to bio_for_each_segment_all_sp() Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
Re: [PATCH v3 46/49] fs/btrfs: convert to bio_for_each_segment_all_sp() Filipe Manana <fdmanana@gmail.com> - 2017-08-08 11:10 +0200
[PATCH v3 38/49] fs/block: convert to bio_for_each_segment_all_sp() Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
[PATCH v3 18/49] block: introduce multipage/single page bvec helpers Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
Re: [PATCH v3 18/49] block: introduce multipage/single page bvec helpers Christoph Hellwig <hch@infradead.org> - 2017-08-10 14:10 +0200
[PATCH v3 47/49] fs/direct-io: convert to bio_for_each_segment_all_sp() Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
[PATCH v3 31/49] block: deal with dirtying pages for multipage bvec Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
[PATCH v3 20/49] block: introduce bio_for_each_segment_mp() Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
Re: [PATCH v3 20/49] block: introduce bio_for_each_segment_mp() Christoph Hellwig <hch@infradead.org> - 2017-08-10 14:30 +0200
[PATCH v3 45/49] fs: crypto: convert to bio_for_each_segment_all_sp() Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
[PATCH v3 40/49] ext4: convert to bio_for_each_segment_all_sp() Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
[PATCH v3 22/49] block: blk-merge: try to make front segments in full size Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
Re: [PATCH v3 22/49] block: blk-merge: try to make front segments in full size Christoph Hellwig <hch@infradead.org> - 2017-08-10 14:30 +0200
[PATCH v3 30/49] btrfs: use bvec_get_last_page to get bio's last page Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
[PATCH v3 36/49] dm-crypt: convert to bio_for_each_segment_all_sp() Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
[PATCH v3 19/49] block: implement sp version of bvec iterator helpers Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:00 +0200
Re: [PATCH v3 19/49] block: implement sp version of bvec iterator helpers Christoph Hellwig <hch@infradead.org> - 2017-08-10 14:10 +0200
[PATCH v3 04/49] mm: page_io.c: comment on direct access to bvec table Ming Lei <ming.lei@redhat.com> - 2017-08-08 11:10 +0200
Re: [PATCH v3 04/49] mm: page_io.c: comment on direct access to bvec table Christoph Hellwig <hch@infradead.org> - 2017-08-10 13:20 +0200
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