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authorJoe Thornber <ejt@redhat.com>2012-07-27 15:08:07 +0100
committerAlasdair G Kergon <agk@redhat.com>2012-07-27 15:08:07 +0100
commit0e9c24ed7443d090e369a2eddfa13f7f0b5afbaf (patch)
tree707aed84bf17ee82bb32bb26e776b97afb3493fe
parentf4b90369d3a9ffe0f48f373c566578c142e95bf2 (diff)
downloadop-kernel-dev-0e9c24ed7443d090e369a2eddfa13f7f0b5afbaf.zip
op-kernel-dev-0e9c24ed7443d090e369a2eddfa13f7f0b5afbaf.tar.gz
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>
-rw-r--r--drivers/md/dm-table.c3
-rw-r--r--include/linux/device-mapper.h6
2 files changed, 9 insertions, 0 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 2e227fb..f900690 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -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;
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 8bdbbfc..bdd65e9 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -212,6 +212,12 @@ struct dm_target {
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.
*/
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