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dm stripe: move sector translation to a function

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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>
This commit is contained in:
Mikulas Patocka 2010-08-12 04:14:14 +01:00 committed by Alasdair G Kergon
parent 38e1b257fd
commit 65988525ab
1 changed files with 14 additions and 7 deletions
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21
drivers/md/dm-stripe.c
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@ -207,11 +207,20 @@ static void stripe_dtr(struct dm_target *ti)
kfree(sc); 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, static int stripe_map(struct dm_target *ti, struct bio *bio,
union map_info *map_context) union map_info *map_context)
{ {
struct stripe_c *sc = (struct stripe_c *) ti->private; struct stripe_c *sc = ti->private;
sector_t offset, chunk;
uint32_t stripe; uint32_t stripe;
unsigned target_request_nr; unsigned target_request_nr;
@ -222,13 +231,11 @@ static int stripe_map(struct dm_target *ti, struct bio *bio,
return DM_MAPIO_REMAPPED; return DM_MAPIO_REMAPPED;
} }
offset = dm_target_offset(ti, bio->bi_sector); stripe_map_sector(sc, bio->bi_sector, &stripe, &bio->bi_sector);
chunk = offset >> sc->chunk_shift;
stripe = sector_div(chunk, sc->stripes);
bio->bi_sector += sc->stripe[stripe].physical_start;
bio->bi_bdev = sc->stripe[stripe].dev->bdev; 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; return DM_MAPIO_REMAPPED;
} }