Commit 65988525 authored by Mikulas Patocka's avatar Mikulas Patocka Committed by Alasdair G Kergon
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dm stripe: move sector translation to a function 



Move sector to stripe translation into a function.

Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
parent 38e1b257

drivers/md/dm-stripe.c

+14 −7
Original line number Diff line number Diff line
@@ -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;

}