diff options
| author | Mikulas Patocka <mpatocka@redhat.com> | 2009-06-22 10:12:22 +0100 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2009-06-22 10:12:22 +0100 |
| commit | 374bf7e7f6cc38b0483351a2029a97910eadde1b (patch) | |
| tree | 10db8f79cd22e0c4ecc683fdd304aca60815bf79 /drivers/md/dm-stripe.c | |
| parent | 433bcac5645508b71eab2710b6817c3ef937eba8 (diff) | |
| download | linux-374bf7e7f6cc38b0483351a2029a97910eadde1b.tar.bz2 | |
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: Mikulas Patocka <mpatocka@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.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c index 41569bc60abc..c64fe827a5f1 100644 --- a/drivers/md/dm-stripe.c +++ b/drivers/md/dm-stripe.c @@ -167,6 +167,7 @@ static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv) sc->stripes = stripes; sc->stripe_width = width; ti->split_io = chunk_size; + ti->num_flush_requests = stripes; sc->chunk_mask = ((sector_t) chunk_size) - 1; 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) { struct stripe_c *sc = (struct stripe_c *) ti->private; + sector_t offset, chunk; + uint32_t stripe; - sector_t offset = bio->bi_sector - ti->begin; - sector_t chunk = offset >> sc->chunk_shift; - uint32_t stripe = sector_div(chunk, sc->stripes); + if (unlikely(bio_empty_barrier(bio))) { + BUG_ON(map_context->flush_request >= 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_sector = sc->stripe[stripe].physical_start + |