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btrfs: merge calculations for simple striped profiles in btrfs_rmap_block
Use the same expression for stripe_nr for RAID0 (map->sub_stripes is 1) and RAID10 (map->sub_stripes is 2), with equivalent results. Reviewed-by: Nikolay Borisov <nborisov@suse.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: David Sterba <dsterba@suse.com>
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@ -1816,11 +1816,10 @@ int btrfs_rmap_block(struct btrfs_fs_info *fs_info, u64 chunk_start,
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stripe_nr = physical - map->stripes[i].physical;
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stripe_nr = div64_u64_rem(stripe_nr, map->stripe_len, &offset);
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if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
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if (map->type & (BTRFS_BLOCK_GROUP_RAID0 |
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BTRFS_BLOCK_GROUP_RAID10)) {
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stripe_nr = stripe_nr * map->num_stripes + i;
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stripe_nr = div_u64(stripe_nr, map->sub_stripes);
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} else if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
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stripe_nr = stripe_nr * map->num_stripes + i;
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}
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/*
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* The remaining case would be for RAID56, multiply by
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