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authorMike Snitzer <snitzer@redhat.com>2011-05-29 12:52:55 +0100
committerAlasdair G Kergon <agk@redhat.com>2011-05-29 12:52:55 +0100
commit4c2593270133708698d4b8cea2dab469479ad13b (patch)
treef408edef9145b2f9553cbb2142347fc79023c4ff /include/linux/device-mapper.h
parent139f37f5e14cd883eee2a8a36289f544b5390a44 (diff)
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dm table: allow targets to support discards internally
Permit a target to support discards regardless of whether or not all its underlying devices do. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'include/linux/device-mapper.h')
-rw-r--r--include/linux/device-mapper.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 32a4423710f5..4427e0454051 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -191,6 +191,12 @@ struct dm_target {
/* Used to provide an error string from the ctr */
char *error;
+
+ /*
+ * Set if this target needs to receive discards regardless of
+ * whether or not its underlying devices have support.
+ */
+ unsigned discards_supported:1;
};
/* Each target can link one of these into the table */