[PATCH 03/10] fs: convert to bio_last_bvec()

[Ming Lei]

This patch convers 3 users to bio_last_bvec(), so that we can go ahread
to convert to multipage bvec.

Signed-off-by: Ming Lei <ming....@redhat.com>
---
 fs/btrfs/compression.c | 2 +-
 fs/btrfs/extent_io.c   | 2 +-
 fs/buffer.c            | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index fc0386c18574..726e1b5b06fe 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -411,7 +411,7 @@ 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->bi_io_vec[bio->bi_vcnt - 1];
+       struct bio_vec *last = bio_last_bvec(bio);
 
        return page_offset(last->bv_page) + last->bv_len + last->bv_offset;
 }
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 012d63870b99..6f6669f93beb 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2724,7 +2724,7 @@ static int __must_check submit_one_bio(struct bio *bio, 
int mirror_num,
                                       unsigned long bio_flags)
 {
        blk_status_t ret = 0;
-       struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
+       struct bio_vec *bvec = bio_last_bvec(bio);
        struct page *page = bvec->bv_page;
        struct extent_io_tree *tree = bio->bi_private;
        u64 start;
diff --git a/fs/buffer.c b/fs/buffer.c
index 0736a6a2e2f0..ceb705ba939f 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -3014,7 +3014,7 @@ static void end_bio_bh_io_sync(struct bio *bio)
 void guard_bio_eod(int op, struct bio *bio)
 {
        sector_t maxsector;
-       struct bio_vec *bvec = &bio->bi_io_vec[bio->bi_vcnt - 1];
+       struct bio_vec *bvec = bio_last_bvec(bio);
        unsigned truncated_bytes;
        struct hd_struct *part;
 
-- 
2.9.5