linux-ext4 - [PATCH V10 07/19] btrfs: use bvec_last

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Date:   Thu, 15 Nov 2018 16:52:54 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Ming Lei <ming.lei@...hat.com>,
        Dave Chinner <dchinner@...hat.com>,
        Kent Overstreet <kent.overstreet@...il.com>,
        Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, Shaohua Li <shli@...nel.org>,
        linux-raid@...r.kernel.org, linux-erofs@...ts.ozlabs.org,
        David Sterba <dsterba@...e.com>, linux-btrfs@...r.kernel.org,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        linux-xfs@...r.kernel.org, Gao Xiang <gaoxiang25@...wei.com>,
        Christoph Hellwig <hch@....de>, Theodore Ts'o <tytso@....edu>,
        linux-ext4@...r.kernel.org, Coly Li <colyli@...e.de>,
        linux-bcache@...r.kernel.org, Boaz Harrosh <ooo@...ctrozaur.com>,
        Bob Peterson <rpeterso@...hat.com>, cluster-devel@...hat.com
Subject: [PATCH V10 07/19] btrfs: use bvec_last_segment to get bio's last page

Preparing for supporting multi-page bvec.

Cc: Dave Chinner <dchinner@...hat.com>
Cc: Kent Overstreet <kent.overstreet@...il.com>
Cc: Mike Snitzer <snitzer@...hat.com>
Cc: dm-devel@...hat.com
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: linux-fsdevel@...r.kernel.org
Cc: Shaohua Li <shli@...nel.org>
Cc: linux-raid@...r.kernel.org
Cc: linux-erofs@...ts.ozlabs.org
Cc: David Sterba <dsterba@...e.com>
Cc: linux-btrfs@...r.kernel.org
Cc: Darrick J. Wong <darrick.wong@...cle.com>
Cc: linux-xfs@...r.kernel.org
Cc: Gao Xiang <gaoxiang25@...wei.com>
Cc: Christoph Hellwig <hch@....de>
Cc: Theodore Ts'o <tytso@....edu>
Cc: linux-ext4@...r.kernel.org
Cc: Coly Li <colyli@...e.de>
Cc: linux-bcache@...r.kernel.org
Cc: Boaz Harrosh <ooo@...ctrozaur.com>
Cc: Bob Peterson <rpeterso@...hat.com>
Cc: cluster-devel@...hat.com
Signed-off-by: Ming Lei <ming.lei@...hat.com>
---
 fs/btrfs/compression.c | 5 ++++-
 fs/btrfs/extent_io.c   | 5 +++--
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 2955a4ea2fa8..161e14b8b180 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -400,8 +400,11 @@ blk_status_t btrfs_submit_compressed_write(struct inode *inode, u64 start,
 static u64 bio_end_offset(struct bio *bio)
 {
 	struct bio_vec *last = bio_last_bvec_all(bio);
+	struct bio_vec bv;
 
-	return page_offset(last->bv_page) + last->bv_len + last->bv_offset;
+	bvec_last_segment(last, &bv);
+
+	return page_offset(bv.bv_page) + bv.bv_len + bv.bv_offset;
 }
 
 static noinline int add_ra_bio_pages(struct inode *inode,
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index d228f706ff3e..5d5965297e7e 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2720,11 +2720,12 @@ static int __must_check submit_one_bio(struct bio *bio, int mirror_num,
 {
 	blk_status_t ret = 0;
 	struct bio_vec *bvec = bio_last_bvec_all(bio);
-	struct page *page = bvec->bv_page;
+	struct bio_vec bv;
 	struct extent_io_tree *tree = bio->bi_private;
 	u64 start;
 
-	start = page_offset(page) + bvec->bv_offset;
+	bvec_last_segment(bvec, &bv);
+	start = page_offset(bv.bv_page) + bv.bv_offset;
 
 	bio->bi_private = NULL;
 
-- 
2.9.5