A target with num_discard_requests > 0 supports discard requests.
The configured number of discard requests will be submitted to the
target.
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
---
drivers/md/dm-linear.c | 1 +
include/linux/device-mapper.h | 6 ++++++
2 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 7071f17..8e925fa 100644
--- a/drivers/md/dm-linear.c
+++ b/drivers/md/dm-linear.c
@@ -53,6 +53,7 @@ static int linear_ctr(struct dm_target *ti, unsigned int argc, char **argv)
}
ti->num_flush_requests = 1;
+ ti->num_discard_requests = 1;
ti->private = lc;
return 0;
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 87beab7..0fe597d 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -181,6 +181,12 @@ struct dm_target {
*/
unsigned num_flush_requests;
+ /*
+ * The number of discard requests that will be submitted to the
+ * target. map_info->request_nr is used just like num_flush_requests.
+ */
+ unsigned num_discard_requests;
+
/* target specific data */
void *private;
--
1.6.6.1
--
dm-devel mailing list
dm-devel@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/dm-devel
