btrfs: cleanup 64bit/32bit divs, provably bounded values

The divisor is derived from nodesize or PAGE_SIZE, fits into 32bit type.
Get rid of a few more do_div instances.

Signed-off-by: David Sterba <dsterba@suse.cz>

1 files changed, 3 insertions, 5 deletions

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 5a7d63cd9c25..293262163daf 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -2623,9 +2623,8 @@ static int get_raid56_logic_offset(u64 physical, int num,
         for (i = 0; i < nr_data_stripes(map); i++) {
                 *offset = last_offset + i * map->stripe_len;
 
-                stripe_nr = *offset;
-                do_div(stripe_nr, map->stripe_len);
-                do_div(stripe_nr, nr_data_stripes(map));
+                stripe_nr = div_u64(*offset, map->stripe_len);
+                stripe_nr = div_u64(stripe_nr, nr_data_stripes(map));
 
                 /* Work out the disk rotation on this stripe-set */
                 rot = do_div(stripe_nr, map->num_stripes);
@@ -2994,10 +2993,9 @@ static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx,
         int extent_mirror_num;
         int stop_loop = 0;
 
-        nstripes = length;
         physical = map->stripes[num].physical;
         offset = 0;
-        do_div(nstripes, map->stripe_len);
+        nstripes = div_u64(length, map->stripe_len);
         if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
                 offset = map->stripe_len * num;
                 increment = map->stripe_len * map->num_stripes;