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23 October 2021, 00:29:24 UTC
Revision 738211f70a1d0c7ff7dc965395f7b8a436365ebd authored by Joe Thornber on 03 March 2014, 15:52:28 UTC, committed by Mike Snitzer on 05 March 2014, 20:26:59 UTC 
dm thin: fix noflush suspend IO queueing
 
i) by the time DM core calls the postsuspend hook the dm_noflush flag
has been cleared.  So the old thin_postsuspend did nothing.  We need to
use the presuspend hook instead.

ii) There was a race between bios leaving DM core and arriving in the
deferred queue.

thin_presuspend now sets a 'requeue' flag causing all bios destined for
that thin to be requeued back to DM core.  Then it requeues all held IO,
and all IO on the deferred queue (destined for that thin).  Finally
postsuspend clears the 'requeue' flag.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
1 parent 18adc57
History
Tip revision: 738211f70a1d0c7ff7dc965395f7b8a436365ebd authored by Joe Thornber on 03 March 2014, 15:52:28 UTC
dm thin: fix noflush suspend IO queueing
Tip revision: 738211f
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