[dm-devel] [PATCH v2 02/17] dm snapshot: add suspended flag to dm_snapshot

[Alasdair G Kergon]

On Tue, Oct 20, 2009 at 06:46:50PM -0400, Mike Snitzer wrote:
> Allow the snapshot target to be able to verify its state relative to a
> requested operation.  Allows for invalid operations to be prevented,
> e.g. an attempt handover an "old" snapshot's exceptions without it
> having been suspended first.
 
OK - same as we do in dm-raid1.

But just be aware that:
        /* This does not get reverted if there's an error later. */
        dm_table_presuspend_targets(map);

and so it's not identical to querying the dm_suspended() property directly.

Alasdair