diff options
| author | Scott Bauer <scott.bauer@intel.com> | 2018-01-23 20:55:18 +0300 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2018-01-29 21:44:58 +0300 |
| commit | cc65661981ae2424e27c695ae8d15604448eb666 (patch) | |
| tree | 62346566d59e7ff082e6d1d95c986c02cf2264dd /drivers | |
| parent | bd6d1e0a5fafd47acb4ca5ca51d5dc8c7563112c (diff) | |
| download | linux-cc65661981ae2424e27c695ae8d15604448eb666.tar.xz | |
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 <scott.bauer@intel.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/md/dm-unstripe.c | 10 |
1 files changed, 2 insertions, 8 deletions
diff --git a/drivers/md/dm-unstripe.c b/drivers/md/dm-unstripe.c index 061b4f10bf5c..65f838fa2e99 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; |