btrfs: scrub: factor out common scrub_stripe constraints

There are common values set for the stripe constraints, some of them
are already factored out. Do that for increment and mirror_num as well.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 518415d..5839ad1 100644 (file)
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -3204,28 +3204,23 @@ static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx,
        physical = map->stripes[num].physical;
        offset = 0;
        nstripes = div64_u64(length, map->stripe_len);
+       mirror_num = 1;
+       increment = map->stripe_len;
        if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
                offset = map->stripe_len * num;
                increment = map->stripe_len * map->num_stripes;
-               mirror_num = 1;
        } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
                int factor = map->num_stripes / map->sub_stripes;
                offset = map->stripe_len * (num / map->sub_stripes);
                increment = map->stripe_len * factor;
                mirror_num = num % map->sub_stripes + 1;
        } else if (map->type & BTRFS_BLOCK_GROUP_RAID1_MASK) {
-               increment = map->stripe_len;
                mirror_num = num % map->num_stripes + 1;
        } else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
-               increment = map->stripe_len;
                mirror_num = num % map->num_stripes + 1;
        } else if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
                get_raid56_logic_offset(physical, num, map, &offset, NULL);
                increment = map->stripe_len * nr_data_stripes(map);
-               mirror_num = 1;
-       } else {
-               increment = map->stripe_len;
-               mirror_num = 1;
        }
 
        path = btrfs_alloc_path();