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btrfs: use raid_attr table in calc_stripe_length for nparity

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

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2019-05-14 01:59:54 +02:00
parent 0e56315ca1
commit e4f6c6be81
1 changed files with 5 additions and 10 deletions
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15
fs/btrfs/volumes.c
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@ -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);
}