Mikulas Patocka 2bd0234525 dm snapshot: use barrier when writing exception store ...

Send barrier requests when updating the exception area.

Exception area updates need to be ordered w.r.t. data writes, so that
the writes are not reordered in hardware disk cache.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

2009-06-22 10:12:26 +01:00

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