xfs: use bio_reuse in the zone GC code

Replace our somewhat fragile code to reuse the bio, which caused a
regression in the past with the block layer bio_reuse helper.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Hans Holmberg <[email protected]>
Reviewed-by: Carlos Maiolino <[email protected]>
Reviewed-by: Damien Le Moal <[email protected]>
Reviewed-by: "Darrick J. Wong" <[email protected]>

Author: Christoph Hellwig

fs/xfs/xfs_zone_gc.c

@@ -811,8 +811,6 @@ xfs_zone_gc_write_chunk(
 {
 	struct xfs_zone_gc_data	*data = chunk->data;
 	struct xfs_mount	*mp = chunk->ip->i_mount;
-	phys_addr_t		bvec_paddr =
-		bvec_phys(bio_first_bvec_all(&chunk->bio));
 	struct xfs_gc_bio	*split_chunk;
 
 	if (chunk->bio.bi_status)
@@ -825,10 +823,7 @@ xfs_zone_gc_write_chunk(
 	WRITE_ONCE(chunk->state, XFS_GC_BIO_NEW);
 	list_move_tail(&chunk->entry, &data->writing);
 
-	bio_reset(&chunk->bio, mp->m_rtdev_targp->bt_bdev, REQ_OP_WRITE);
-	bio_add_folio_nofail(&chunk->bio, chunk->scratch->folio, chunk->len,
-			offset_in_folio(chunk->scratch->folio, bvec_paddr));
-
+	bio_reuse(&chunk->bio, REQ_OP_WRITE);
 	while ((split_chunk = xfs_zone_gc_split_write(data, chunk)))
 		xfs_zone_gc_submit_write(data, split_chunk);
 	xfs_zone_gc_submit_write(data, chunk);