btrfs: remove unused bio_flags argument to btrfs_submit_metadata_bio

This argument is unused since commit 953651eb ("btrfs: factor out
helper adding a page to bio") and commit 1b36294a ("btrfs: call
submit_bio_hook directly for metadata pages") reworked the way metadata
bio submission is handled.
Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/disk-io.c

@@ -921,7 +921,7 @@ static bool should_async_write(struct btrfs_fs_info *fs_info,
 }
 
 blk_status_t btrfs_submit_metadata_bio(struct inode *inode, struct bio *bio,
-				       int mirror_num, unsigned long bio_flags)
+				       int mirror_num)
 {
 	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
 	blk_status_t ret;

fs/btrfs/disk-io.h

@@ -88,7 +88,7 @@ int btrfs_validate_metadata_buffer(struct btrfs_bio *bbio,
 				   struct page *page, u64 start, u64 end,
 				   int mirror);
 blk_status_t btrfs_submit_metadata_bio(struct inode *inode, struct bio *bio,
-				       int mirror_num, unsigned long bio_flags);
+				       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

@@ -190,8 +190,7 @@ static void submit_one_bio(struct bio *bio, int mirror_num, unsigned long bio_fl
 		btrfs_submit_data_bio(tree->private_data, bio, mirror_num,
 					    bio_flags);
 	else
-		btrfs_submit_metadata_bio(tree->private_data, bio,
-						mirror_num, bio_flags);
+		btrfs_submit_metadata_bio(tree->private_data, bio, mirror_num);
 	/*
 	 * Above submission hooks will handle the error by ending the bio,
 	 * which will do the cleanup properly.  So here we should not return