[PATCH 06/15] btrfs: use raid_attr table in calc_stripe_length for nparity

[David Sterba]

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

Signed-off-by: David Sterba <dste...@suse.com>
---
 fs/btrfs/volumes.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 995a15a816f2..743ed1f0b2a6 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -6652,19 +6652,14 @@ 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;
+       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);
 }
 
-- 
2.21.0