btrfs: use raid_attr table in calc_stripe_length for nparity (e4f6c6be) · Commits · 戴 / test

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);
		}