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authorMike Snitzer <snitzer@redhat.com>2010-08-12 04:14:08 +0100
committerAlasdair G Kergon <agk@redhat.com>2010-08-12 04:14:08 +0100
commit5ae89a8720c28caf35c4e53711d77df2856c404e (patch)
tree712ddc158309d7ad77e3c19e70f0ae9fafb94446 /drivers/md/dm-linear.c
parent5ebaee6d290279d1df6ce45d6d54de8cfc473273 (diff)
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dm: linear support discard
Allow discards to be passed through to linear mappings if at least one underlying device supports it. Discards will be forwarded only to devices that support them. A target that supports discards should set num_discard_requests to indicate how many times each discard request must be submitted to it. Verify table's underlying devices support discards prior to setting the associated DM device as capable of discards (via QUEUE_FLAG_DISCARD). Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Reviewed-by: Joe Thornber <thornber@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm-linear.c')
-rw-r--r--drivers/md/dm-linear.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
index 9200dbf2391a..f043b5f433b2 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;