For single device mapping it is safe to introduce get_flush_idx conception.
This cover most common case linear mapping for a single dev.
CC: Alasdair Kergon <a...@redhat.com>
CC: Mike Snitzer <snit...@redhat.com>
CC: dm-de...@redhat.com
Signed-off-by: Dmitry Monakhov <dmonak...@openvz.org>
---
drivers/md/dm.c | 31 +++++++++++++++++++++++++++++++
1 files changed, 31 insertions(+), 0 deletions(-)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 32b958d..042d172 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1843,6 +1843,36 @@ static int dm_any_congested(void *congested_data, int
bdi_bits)
return r;
}
+static int dm_iter_get_flush_idx(struct dm_target *ti,
+ struct dm_dev *dev, sector_t start,
+ sector_t len, void *data)
+{
+ struct block_device *bdev = dev->bdev;
+ struct request_queue *q = bdev_get_queue(bdev);
+
+ return blk_get_flush_idx(q, *((bool *)data));
+}
+
+static unsigned dm_get_flush_idx(struct request_queue *q, bool queued)
+{
+ struct dm_target *ti;
+ struct mapped_device *md = q->queuedata;
+ struct dm_table *map = dm_get_live_table_fast(md);
+ unsigned fid = 0;
+
+ if (unlikely(!map || dm_table_get_num_targets(map) != 1))
+ goto out;
+
+ ti = dm_table_get_target(map, 0);
+ if (unlikely(!ti || !ti->type->iterate_devices))
+ goto out;
+
+ fid = ti->type->iterate_devices(ti, dm_iter_get_flush_idx, &queued);
+out:
+ dm_put_live_table_fast(md);
+ return fid;
+}
+
/*-----------------------------------------------------------------
* An IDR is used to keep track of allocated minor numbers.
*---------------------------------------------------------------*/
@@ -1962,6 +1992,7 @@ static struct mapped_device *alloc_dev(int minor)
goto bad_queue;
dm_init_md_queue(md);
+ blk_queue_get_flush_idx(md->queue, dm_get_flush_idx);
md->disk = alloc_disk(1);
if (!md->disk)
--
1.7.1
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