dm stripe: move sector translation to a function
Move sector to stripe translation into a function.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c
index 779f47a..e2ad1ae 100644
--- a/drivers/md/dm-stripe.c
+++ b/drivers/md/dm-stripe.c
@@ -207,11 +207,20 @@
kfree(sc);
}
+static void stripe_map_sector(struct stripe_c *sc, sector_t sector,
+ uint32_t *stripe, sector_t *result)
+{
+ sector_t offset = dm_target_offset(sc->ti, sector);
+ sector_t chunk = offset >> sc->chunk_shift;
+
+ *stripe = sector_div(chunk, sc->stripes);
+ *result = (chunk << sc->chunk_shift) | (offset & sc->chunk_mask);
+}
+
static int stripe_map(struct dm_target *ti, struct bio *bio,
union map_info *map_context)
{
- struct stripe_c *sc = (struct stripe_c *) ti->private;
- sector_t offset, chunk;
+ struct stripe_c *sc = ti->private;
uint32_t stripe;
unsigned target_request_nr;
@@ -222,13 +231,11 @@
return DM_MAPIO_REMAPPED;
}
- offset = dm_target_offset(ti, bio->bi_sector);
- chunk = offset >> sc->chunk_shift;
- stripe = sector_div(chunk, sc->stripes);
+ stripe_map_sector(sc, bio->bi_sector, &stripe, &bio->bi_sector);
+ bio->bi_sector += sc->stripe[stripe].physical_start;
bio->bi_bdev = sc->stripe[stripe].dev->bdev;
- bio->bi_sector = sc->stripe[stripe].physical_start +
- (chunk << sc->chunk_shift) + (offset & sc->chunk_mask);
+
return DM_MAPIO_REMAPPED;
}