[PATCH] dm: make sure QUEUE_FLAG_CLUSTER is set properly

This flag should be set for a virtual device iff it is set for all
underlying devices.

Signed-off-by: Neil Brown <neilb@suse.de>
Acked-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 10 insertions, 0 deletions

diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 907b08ddb783..9558a4acec12 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -97,6 +97,8 @@ static void combine_restrictions_low(struct io_restrictions *lhs,
 
         lhs->seg_boundary_mask =
                 min_not_zero(lhs->seg_boundary_mask, rhs->seg_boundary_mask);
+
+        lhs->no_cluster |= rhs->no_cluster;
 }
 
 /*
@@ -523,6 +525,8 @@ int dm_get_device(struct dm_target *ti, const char *path, sector_t start,
                 rs->seg_boundary_mask =
                         min_not_zero(rs->seg_boundary_mask,
                                      q->seg_boundary_mask);
+
+                rs->no_cluster |= !test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags);
         }
 
         return r;
@@ -832,6 +836,11 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q)
         q->hardsect_size = t->limits.hardsect_size;
         q->max_segment_size = t->limits.max_segment_size;
         q->seg_boundary_mask = t->limits.seg_boundary_mask;
+        if (t->limits.no_cluster)
+                q->queue_flags &= ~(1 << QUEUE_FLAG_CLUSTER);
+        else
+                q->queue_flags |= (1 << QUEUE_FLAG_CLUSTER);
+
 }
 
 unsigned int dm_table_get_num_targets(struct dm_table *t)
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 51e0e95a421a..aee10b2ea4c6 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -97,6 +97,7 @@ struct io_restrictions {
         unsigned short          hardsect_size;
         unsigned int            max_segment_size;
         unsigned long           seg_boundary_mask;
+        unsigned char           no_cluster; /* inverted so that 0 is default */
 };
 
 struct dm_target {