Commit 52b1fd5a authored by Mikulas Patocka's avatar Mikulas Patocka Committed by Alasdair G Kergon
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dm: send empty barriers to targets in dm_flush 



Pass empty barrier flushes to the targets in dm_flush().

Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
parent 9015df24

drivers/md/dm.c

+10 −0
Original line number Diff line number Diff line
@@ -164,6 +164,9 @@ 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
@@ -1477,6 +1480,13 @@ static int dm_wait_for_completion(struct mapped_device *md, int interruptible) 
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)