Btrfs: fix __btrfs_map_block on 32 bit machines
Recent changes for discard support didn't compile,
this fixes them not to try and % 64 bit numbers.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index c440c89..8b9fb8c 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -3126,13 +3126,19 @@
if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
u64 stripes;
- int last_stripe = (stripe_nr_end - 1) %
- map->num_stripes;
+ u32 last_stripe = 0;
int j;
+ div_u64_rem(stripe_nr_end - 1,
+ map->num_stripes,
+ &last_stripe);
+
for (j = 0; j < map->num_stripes; j++) {
- if ((stripe_nr_end - 1 - j) %
- map->num_stripes == stripe_index)
+ u32 test;
+
+ div_u64_rem(stripe_nr_end - 1 - j,
+ map->num_stripes, &test);
+ if (test == stripe_index)
break;
}
stripes = stripe_nr_end - 1 - j;
@@ -3153,11 +3159,19 @@
int j;
int factor = map->num_stripes /
map->sub_stripes;
- int last_stripe = (stripe_nr_end - 1) % factor;
+ u32 last_stripe = 0;
+
+ div_u64_rem(stripe_nr_end - 1,
+ factor, &last_stripe);
last_stripe *= map->sub_stripes;
for (j = 0; j < factor; j++) {
- if ((stripe_nr_end - 1 - j) % factor ==
+ u32 test;
+
+ div_u64_rem(stripe_nr_end - 1 - j,
+ factor, &test);
+
+ if (test ==
stripe_index / map->sub_stripes)
break;
}