diff options
| author | Heinz Mauelshagen <heinzm@redhat.com> | 2018-02-01 19:06:09 +0100 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2018-04-03 15:04:12 -0400 |
| commit | 2ae600cd15a7cce7f2c26d24cfbd9c1bc9e1810d (patch) | |
| tree | 3a0313f5998abd64f3241ee074ef219bfebce4c0 /drivers/md | |
| parent | 5059353df86e2573ccd9d43fd9d9396dcec47ca2 (diff) | |
| download | linux-2ae600cd15a7cce7f2c26d24cfbd9c1bc9e1810d.tar.bz2 | |
dm unstripe: support non-power-of-2 chunk size
Address "FIXME: must support non power of 2 chunk_size, dm-stripe.c does".
Bump target version to indicate change.
Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Tested-by: Scott Bauer <Scott.Bauer@intel.com>
Reviewed-by: Scott Bauer <Scott.Bauer@intel.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/dm-unstripe.c | 22 |
1 files changed, 10 insertions, 12 deletions
diff --git a/drivers/md/dm-unstripe.c b/drivers/md/dm-unstripe.c index 65f838fa2e99..05d76f337838 100644 --- a/drivers/md/dm-unstripe.c +++ b/drivers/md/dm-unstripe.c @@ -69,12 +69,6 @@ static int unstripe_ctr(struct dm_target *ti, unsigned int argc, char **argv) goto err; } - // FIXME: must support non power of 2 chunk_size, dm-stripe.c does - if (!is_power_of_2(uc->chunk_size)) { - ti->error = "Non power of 2 chunk_size is not supported yet"; - goto err; - } - if (kstrtouint(argv[2], 10, &uc->unstripe)) { ti->error = "Invalid stripe number"; goto err; @@ -98,7 +92,7 @@ static int unstripe_ctr(struct dm_target *ti, unsigned int argc, char **argv) uc->unstripe_offset = uc->unstripe * uc->chunk_size; uc->unstripe_width = (uc->stripes - 1) * uc->chunk_size; - uc->chunk_shift = fls(uc->chunk_size) - 1; + uc->chunk_shift = is_power_of_2(uc->chunk_size) ? fls(uc->chunk_size) - 1 : 0; tmp_len = ti->len; if (sector_div(tmp_len, uc->chunk_size)) { @@ -129,14 +123,18 @@ static sector_t map_to_core(struct dm_target *ti, struct bio *bio) { struct unstripe_c *uc = ti->private; sector_t sector = bio->bi_iter.bi_sector; + sector_t tmp_sector = sector; /* Shift us up to the right "row" on the stripe */ - sector += uc->unstripe_width * (sector >> uc->chunk_shift); + if (uc->chunk_shift) + tmp_sector >>= uc->chunk_shift; + else + sector_div(tmp_sector, uc->chunk_size); - /* Account for what stripe we're operating on */ - sector += uc->unstripe_offset; + sector += uc->unstripe_width * tmp_sector; - return sector; + /* Account for what stripe we're operating on */ + return sector + uc->unstripe_offset; } static int unstripe_map(struct dm_target *ti, struct bio *bio) @@ -185,7 +183,7 @@ static void unstripe_io_hints(struct dm_target *ti, static struct target_type unstripe_target = { .name = "unstriped", - .version = {1, 0, 0}, + .version = {1, 1, 0}, .module = THIS_MODULE, .ctr = unstripe_ctr, .dtr = unstripe_dtr, |