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dm: remove EOPNOTSUPP for barriers 

If the underlying device doesn't support barriers and dm receives a
barrier, it waits until all requests on that device drain so it no
longer needs to report -EOPNOTSUPP to the caller.

This patch deals with the confusing situation when moving a volume from
one physical device to another triggers an EOPNOTSUPP on a volume that
didn't report it before.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mikulas Patocka 2009-06-22 10:12:19 +01:00 committed by Alasdair G Kergon
parent 5aa2781d96
commit fdb9572b73
1 changed files with 1 additions and 1 deletions
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2
drivers/md/dm.c
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@ -555,7 +555,7 @@ static void dec_pending(struct dm_io *io, int error)
* a per-device variable for error reporting.
* Note that you can't touch the bio after end_io_acct
*/
if (!md->barrier_error)
if (!md->barrier_error && io_error != -EOPNOTSUPP)
md->barrier_error = io_error;
end_io_acct(io);
} else {