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authorMikulas Patocka <mpatocka@redhat.com>2010-08-12 07:14:14 +0400
committerAlasdair G Kergon <agk@redhat.com>2010-08-12 07:14:14 +0400
commit65988525abde0b0a5833c4e20f32967184a5dcf0 (patch)
tree27e8908099d9dbd1473e6b69775fcba23827d2a1 /drivers/md/dm-stripe.c
parent38e1b257fd7b4f3eee667d29a5e44ec15e253c1c (diff)
downloadlinux-65988525abde0b0a5833c4e20f32967184a5dcf0.tar.xz
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>
Diffstat (limited to 'drivers/md/dm-stripe.c')
-rw-r--r--drivers/md/dm-stripe.c21
1 files changed, 14 insertions, 7 deletions
diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c
index 779f47a0fe71..e2ad1ae5268d 100644
--- a/drivers/md/dm-stripe.c
+++ b/drivers/md/dm-stripe.c
@@ -207,11 +207,20 @@ static void stripe_dtr(struct dm_target *ti)
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 @@ static int stripe_map(struct dm_target *ti, struct bio *bio,
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;
}