dm snapshot: support barriers in snapshot merge target

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Sets num_flush_requests=2 to support flushing both the origin and cow
devices used by the snapshot-merge target.

Also, snapshot_ctr() now gets the origin device using FMODE_WRITE if the
target is snapshot-merge (which writes to the origin device).

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

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Mike Snitzer 2009-12-10 23:52:31 +00:00 • committed by Alasdair G Kergon

parent 3452c2a1eb

commit 10b8106a70

1 changed files with 18 additions and 3 deletions

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drivers/md/dm-snap.c

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