]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
dm unstripe: fix target length versus number of stripes size check
authorScott Bauer <scott.bauer@intel.com>
Tue, 23 Jan 2018 17:55:18 +0000 (10:55 -0700)
committerMike Snitzer <snitzer@redhat.com>
Mon, 29 Jan 2018 18:44:58 +0000 (13:44 -0500)
commitcc65661981ae2424e27c695ae8d15604448eb666
tree62346566d59e7ff082e6d1d95c986c02cf2264dd
parentbd6d1e0a5fafd47acb4ca5ca51d5dc8c7563112c
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>
drivers/md/dm-unstripe.c