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authorMikulas Patocka <mpatocka@redhat.com>2009-06-22 10:12:21 +0100
committerAlasdair G Kergon <agk@redhat.com>2009-06-22 10:12:21 +0100
commit52b1fd5a27c625c78373e024bf570af3c9d44a79 (patch)
treea802b917b45685255220efaeb7b2b8ee2d04a2d4 /drivers/md/dm.c
parent9015df24a8008d7bea2bd3df881783ebe0dcb9af (diff)
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>
Diffstat (limited to 'drivers/md/dm.c')
-rw-r--r--drivers/md/dm.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index edf9f2467691..36142e947ffc 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -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)