static inline int ext4_issue_discard(struct super_block *sb,
		ext4_group_t block_group, ext4_grpblk_t cluster, int count,
		struct bio **biop)
{
	ext4_fsblk_t discard_block;

	discard_block = (EXT4_C2B(EXT4_SB(sb), cluster) +
			 ext4_group_first_block_no(sb, block_group));
	count = EXT4_C2B(EXT4_SB(sb), count);
	trace_ext4_discard_blocks(sb,
			(unsigned long long) discard_block, count);
	if (biop) {
		return __blkdev_issue_discard(sb->s_bdev,
			(sector_t)discard_block << (sb->s_blocksize_bits - 9),
			(sector_t)count << (sb->s_blocksize_bits - 9),
			GFP_NOFS, 0, biop);
	} else
		return sb_issue_discard(sb, discard_block, count, GFP_NOFS, 0);
}
static inline int ext4_issue_discard(struct super_block *sb,
		ext4_group_t block_group, ext4_grpblk_t cluster, int count,
		struct bio **biop)
{
	ext4_fsblk_t discard_block;

	discard_block = (EXT4_C2B(EXT4_SB(sb), cluster) +
			 ext4_group_first_block_no(sb, block_group));
	count = EXT4_C2B(EXT4_SB(sb), count);
	trace_ext4_discard_blocks(sb,
			(unsigned long long) discard_block, count);
	if (biop) {
		return __blkdev_issue_discard(sb->s_bdev,
			(sector_t)discard_block << (sb->s_blocksize_bits - 9),
			(sector_t)count << (sb->s_blocksize_bits - 9),
			GFP_NOFS, 0, biop);
	} else
		return sb_issue_discard(sb, discard_block, count, GFP_NOFS, 0);
}