From: Scott Bauer Date: Tue, 23 Jan 2018 17:55:18 +0000 (-0700) Subject: dm unstripe: fix target length versus number of stripes size check X-Git-Tag: v4.19~1720^2~2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=cc65661981ae2424e27c695ae8d15604448eb666;p=platform%2Fkernel%2Flinux-rpi3.git dm unstripe: fix target length versus number of stripes size check Since the unstripe target takes a target length which is the size of *one* striped member we're trying to expose, not the total size of *all* the striped members, the check does not make sense and fails for some striped setups. For example, say we have a 4TB striped device: or 3907018496 sectors per underlying device: if (sector_div(width, uc->stripes)) : 3907018496 / 2(num stripes) == 1953509248 tmp_len = width; if (sector_div(tmp_len, uc->chunk_size)) : 1953509248 / 256(chunk size) == 7630895.5 (fails) Fix this by removing the first check which isn't valid for unstriping. Signed-off-by: Scott Bauer Signed-off-by: Mike Snitzer --- diff --git a/drivers/md/dm-unstripe.c b/drivers/md/dm-unstripe.c index 061b4f1..65f838f 100644 --- a/drivers/md/dm-unstripe.c +++ b/drivers/md/dm-unstripe.c @@ -44,7 +44,7 @@ static void cleanup_unstripe(struct unstripe_c *uc, struct dm_target *ti) static int unstripe_ctr(struct dm_target *ti, unsigned int argc, char **argv) { struct unstripe_c *uc; - sector_t width, tmp_len; + sector_t tmp_len; unsigned long long start; char dummy; @@ -100,13 +100,7 @@ static int unstripe_ctr(struct dm_target *ti, unsigned int argc, char **argv) uc->unstripe_width = (uc->stripes - 1) * uc->chunk_size; uc->chunk_shift = fls(uc->chunk_size) - 1; - width = ti->len; - if (sector_div(width, uc->stripes)) { - ti->error = "Target length not divisible by number of stripes"; - goto err; - } - - tmp_len = width; + tmp_len = ti->len; if (sector_div(tmp_len, uc->chunk_size)) { ti->error = "Target length not divisible by chunk size"; goto err;