[PATCH 07/10] btrfs: simplify finding the inode in submit_one_bio

[Christoph Hellwig <hch@lst.de>]

struct btrfs_bio now has an always valid inode pointer that can be used
to find the inode in submit_one_bio, so use that and initialize all
variables for which it is possible at declaration time.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
---
 fs/btrfs/extent_io.c | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 2b9e24782b36f5..2670c479847094 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -123,23 +123,16 @@ struct btrfs_bio_ctrl {
 
 static void submit_one_bio(struct btrfs_bio_ctrl *bio_ctrl)
 {
-	struct bio *bio;
-	struct bio_vec *bv;
-	struct inode *inode;
-	int mirror_num;
+	struct bio *bio = bio_ctrl->bio;
+	int mirror_num = bio_ctrl->mirror_num;
 
-	if (!bio_ctrl->bio)
+	if (!bio)
 		return;
 
-	bio = bio_ctrl->bio;
-	bv = bio_first_bvec_all(bio);
-	inode = bv->bv_page->mapping->host;
-	mirror_num = bio_ctrl->mirror_num;
-
 	/* Caller should ensure the bio has at least some range added */
 	ASSERT(bio->bi_iter.bi_size);
 
-	if (!is_data_inode(inode)) {
+	if (!is_data_inode(&btrfs_bio(bio)->inode->vfs_inode)) {
 		if (btrfs_op(bio) != BTRFS_MAP_WRITE) {
 			/*
 			 * For metadata read, we should have the parent_check,
-- 
2.39.1