Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 374bf7e7 authored by Mikulas Patocka's avatar Mikulas Patocka Committed by Alasdair G Kergon
Browse files

dm: stripe support flush 



Flush support for the stripe target.

This sets ti->num_flush_requests to the number of stripes and
remaps individual flush requests to the appropriate stripe devices.

Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
parent 433bcac5

drivers/md/dm-stripe.c

+12 −3
Original line number Original line Diff line number Diff line
@@ -167,6 +167,7 @@ static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv) 
	sc->stripes = stripes;

	sc->stripes = stripes;

	sc->stripe_width = width;

	sc->stripe_width = width;

	ti->split_io = chunk_size;

	ti->split_io = chunk_size;

	ti->num_flush_requests = stripes;





	sc->chunk_mask = ((sector_t) chunk_size) - 1;

	sc->chunk_mask = ((sector_t) chunk_size) - 1;

	for (sc->chunk_shift = 0; chunk_size; sc->chunk_shift++)

	for (sc->chunk_shift = 0; chunk_size; sc->chunk_shift++)
@@ -211,10 +212,18 @@ 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 = (struct stripe_c *) ti->private;

	sector_t offset, chunk;

	uint32_t stripe;





	sector_t offset = bio->bi_sector - ti->begin;

	if (unlikely(bio_empty_barrier(bio))) {

	sector_t chunk = offset >> sc->chunk_shift;

		BUG_ON(map_context->flush_request >= sc->stripes);

	uint32_t stripe = sector_div(chunk, sc->stripes);

		bio->bi_bdev = sc->stripe[map_context->flush_request].dev->bdev;

		return DM_MAPIO_REMAPPED;

	}



	offset = bio->bi_sector - ti->begin;

	chunk = offset >> sc->chunk_shift;

	stripe = sector_div(chunk, sc->stripes);





	bio->bi_bdev = sc->stripe[stripe].dev->bdev;

	bio->bi_bdev = sc->stripe[stripe].dev->bdev;

	bio->bi_sector = sc->stripe[stripe].physical_start +

	bio->bi_sector = sc->stripe[stripe].physical_start +