Alasdair G Kergon 54d9a1b451 dm: simplify dm_request loop
Refactor the code in dm_request().

Require the new DMF_BLOCK_FOR_SUSPEND flag on readahead bios we will
discard so we don't drop such bios while processing a barrier.

Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2009-04-09 00:27:14 +01:00
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