dm-flush-make-empty-barrier.patch
Modify dm_flush so that is passes empty barrier flushes to the targets.
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
---
drivers/md/dm.c | 10 ++++++++++
1 file changed, 10 insertions(+)
Index: linux-2.6.30-rc2-devel/drivers/md/dm.c
===================================================================
--- linux-2.6.30-rc2-devel.orig/drivers/md/dm.c 2009-04-15 16:35:49.000000000 +0200
+++ linux-2.6.30-rc2-devel/drivers/md/dm.c 2009-04-15 16:35:54.000000000 +0200
@@ -175,6 +175,9 @@ struct mapped_device {
/* sysfs handle */
struct kobject kobj;
+
+ /* zero-length barrier that will be cloned and submitted to targets */
+ struct bio barrier_bio;
};
#define MIN_IOS 256
@@ -1475,6 +1478,13 @@ static int dm_wait_for_completion(struct
static void dm_flush(struct mapped_device *md)
{
dm_wait_for_completion(md, TASK_UNINTERRUPTIBLE);
+
+ bio_init(&md->barrier_bio);
+ md->barrier_bio.bi_bdev = md->bdev;
+ md->barrier_bio.bi_rw = WRITE_BARRIER;
+ __split_and_process_bio(md, &md->barrier_bio);
+
+ dm_wait_for_completion(md, TASK_UNINTERRUPTIBLE);
}
static void process_barrier(struct mapped_device *md, struct bio *bio)
--
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