Commit e4f6c6be authored by David Sterba's avatar David Sterba
Browse files

btrfs: use raid_attr table in calc_stripe_length for nparity 



The table is already used for ncopies, replace open coding of stripes
with the raid_attr value.

Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 0e56315c

fs/btrfs/volumes.c

+5 −10
Original line number Diff line number Diff line
@@ -6480,19 +6480,14 @@ static u64 calc_stripe_length(u64 type, u64 chunk_len, int num_stripes) 
{

	int index = btrfs_bg_flags_to_raid_index(type);

	int ncopies = btrfs_raid_array[index].ncopies;

	const int nparity = btrfs_raid_array[index].nparity;

	int data_stripes;



	switch (type & BTRFS_BLOCK_GROUP_PROFILE_MASK) {

	case BTRFS_BLOCK_GROUP_RAID5:

		data_stripes = num_stripes - 1;

		break;

	case BTRFS_BLOCK_GROUP_RAID6:

		data_stripes = num_stripes - 2;

		break;

	default:

	if (nparity)

		data_stripes = num_stripes - nparity;

	else

		data_stripes = num_stripes / ncopies;

		break;

	}



	return div_u64(chunk_len, data_stripes);

}