dm: send empty barriers to targets in dm_flush
Pass empty barrier flushes to the targets in dm_flush(). Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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@ -164,6 +164,9 @@ struct mapped_device {
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/* sysfs handle */
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struct kobject kobj;
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/* zero-length barrier that will be cloned and submitted to targets */
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struct bio barrier_bio;
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};
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#define MIN_IOS 256
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@ -1477,6 +1480,13 @@ static int dm_wait_for_completion(struct mapped_device *md, int interruptible)
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static void dm_flush(struct mapped_device *md)
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{
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dm_wait_for_completion(md, TASK_UNINTERRUPTIBLE);
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bio_init(&md->barrier_bio);
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md->barrier_bio.bi_bdev = md->bdev;
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md->barrier_bio.bi_rw = WRITE_BARRIER;
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__split_and_process_bio(md, &md->barrier_bio);
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dm_wait_for_completion(md, TASK_UNINTERRUPTIBLE);
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}
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static void process_barrier(struct mapped_device *md, struct bio *bio)
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