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btrfs: read number of data stripes from map only once

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There are several places that call nr_data_stripes, but this value does
not change.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba
2019-05-17 11:43:45 +02:00
parent 72ad813157
commit cff8267228
2 changed files with 13 additions and 12 deletions
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8
fs/btrfs/scrub.c
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@@ -2660,18 +2660,18 @@ static int get_raid56_logic_offset(u64 physical, int num,
u64 last_offset;
u32 stripe_index;
u32 rot;
const int data_stripes = nr_data_stripes(map);
last_offset = (physical - map->stripes[num].physical) *
nr_data_stripes(map);
last_offset = (physical - map->stripes[num].physical) * data_stripes;
if (stripe_start)
*stripe_start = last_offset;
*offset = last_offset;
for (i = 0; i < nr_data_stripes(map); i++) {
for (i = 0; i < data_stripes; i++) {
*offset = last_offset + i * map->stripe_len;
stripe_nr = div64_u64(*offset, map->stripe_len);
stripe_nr = div_u64(stripe_nr, nr_data_stripes(map));
stripe_nr = div_u64(stripe_nr, data_stripes);
/* Work out the disk rotation on this stripe-set */
stripe_nr = div_u64_rem(stripe_nr, map->num_stripes, &rot);