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Commit 0e9c24ed authored Jul 27, 2012 by Joe Thornber Committed by Alasdair G Kergon Jul 27, 2012

dm: allow targets to request flushes regardless of underlying device support



Allow targets to override the 'supports flush' calculation.

Set 'flush_supported' if a target needs to receive flushes regardless of
whether or not its underlying devices have support.

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

parent f4b90369

drivers/md/dm-table.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -1319,6 +1319,9 @@ static bool dm_table_supports_flush(struct dm_table *t, unsigned flush)
		if (!ti->num_flush_requests)
		continue;

		if (ti->flush_supported)
		return 1;

		if (ti->type->iterate_devices &&
		ti->type->iterate_devices(ti, device_flush_capable, &flush))
		return 1;

include/linux/device-mapper.h

+6 −0

Original line number	Diff line number	Diff line
		@@ -211,6 +211,12 @@ struct dm_target {
		/* Used to provide an error string from the ctr */
		char *error;

		/*
		* Set if this target needs to receive flushes regardless of
		* whether or not its underlying devices have support.
		*/
		bool flush_supported:1;

		/*
		* Set if this target needs to receive discards regardless of
		* whether or not its underlying devices have support.