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Re: [dm-devel] [PATCH 24.5/30] jbd2: Modify ASYNC_COMMIT code to not rely on queue draining on barrier


Tejun Heo wrote:

From 49f4cef00a1bd3c79fb2fe1f982c5157f0792867 Mon Sep 17 00:00:00 2001
From: Jan Kara <jack suse cz>

Currently JBD2 relies blkdev_issue_flush() draining the queue when ASYNC_COMMIT
feature is set. This property is going away so make JBD2 wait for buffers it
needs on its own before submitting the cache flush.

Signed-off-by: Jan Kara <jack suse cz>
Signed-off-by: Tejun Heo <tj kernel org>
This patch is necessary before enabling flush/fua support in jbd2.
The flush-fua git tree has been udpated to included this between patch
24 and 25.


 fs/jbd2/commit.c |   29 ++++++++++++++++-------------
 1 files changed, 16 insertions(+), 13 deletions(-)

diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index 7c068c1..8797fd1 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -845,6 +842,12 @@ wait_for_iobuf:
 	if (!err && !is_journal_aborted(journal))
 		err = journal_wait_on_commit_record(journal, cbh);
+	    journal->j_flags & JBD2_BARRIER) {
+			blkdev_issue_flush(journal->j_dev, GFP_KERNEL, NULL,

   Overindented line.

+	}

 	if (err)
 		jbd2_journal_abort(journal, err);

WBR, Sergei

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