btrfs: pass btrfs_inode to btrfs_submit_metadata_bio

The function is for internal interfaces so we should use the
btrfs_inode.
Reviewed-by: NAnand Jain <anand.jain@oracle.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>

fs/btrfs/disk-io.c

@@ -766,9 +766,9 @@ static bool should_async_write(struct btrfs_fs_info *fs_info,
 	return true;
 }
 
-void btrfs_submit_metadata_bio(struct inode *inode, struct bio *bio, int mirror_num)
+void btrfs_submit_metadata_bio(struct btrfs_inode *inode, struct bio *bio, int mirror_num)
 {
-	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
+	struct btrfs_fs_info *fs_info = inode->root->fs_info;
 	struct btrfs_bio *bbio = btrfs_bio(bio);
 	blk_status_t ret;
 
@@ -783,8 +783,8 @@ void btrfs_submit_metadata_bio(struct inode *inode, struct bio *bio, int mirror_
 	 * Kthread helpers are used to submit writes so that checksumming can
 	 * happen in parallel across all CPUs.
 	 */
-	if (should_async_write(fs_info, BTRFS_I(inode)) &&
-	    btrfs_wq_submit_bio(BTRFS_I(inode), bio, mirror_num, 0, WQ_SUBMIT_METADATA))
+	if (should_async_write(fs_info, inode) &&
+	    btrfs_wq_submit_bio(inode, bio, mirror_num, 0, WQ_SUBMIT_METADATA))
 		return;
 
 	ret = btree_csum_one_bio(bio);

fs/btrfs/disk-io.h

@@ -86,7 +86,7 @@ void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
 int btrfs_validate_metadata_buffer(struct btrfs_bio *bbio,
 				   struct page *page, u64 start, u64 end,
 				   int mirror);
-void btrfs_submit_metadata_bio(struct inode *inode, struct bio *bio, int mirror_num);
+void btrfs_submit_metadata_bio(struct btrfs_inode *inode, struct bio *bio, int mirror_num);
 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
 struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);
 #endif

fs/btrfs/extent_io.c

@@ -134,7 +134,7 @@ static void submit_one_bio(struct btrfs_bio_ctrl *bio_ctrl)
 	btrfs_bio(bio)->file_offset = page_offset(bv->bv_page) + bv->bv_offset;
 
 	if (!is_data_inode(inode))
-		btrfs_submit_metadata_bio(inode, bio, mirror_num);
+		btrfs_submit_metadata_bio(BTRFS_I(inode), bio, mirror_num);
 	else if (btrfs_op(bio) == BTRFS_MAP_WRITE)
 		btrfs_submit_data_write_bio(inode, bio, mirror_num);
 	else