[PATCH] jbd2: Fix forever sleeping process in do_get_write_access()

[Jan Kara <jack@suse.cz>]

In do_get_write_access() we wait on BH_Unshadow bit for buffer to get
from shadow state. The waking code in journal_commit_transaction() has
a bug because it does not issue a memory barrier after the buffer is moved
from the shadow state and before wake_up_bit() is called. Thus a waitqueue
check can happen before the buffer is actually moved from the shadow state
and waiting process may never be woken. Fix the problem by issuing proper
barrier.

Reported-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: Jan Kara <jack@suse.cz>
---
 fs/jbd2/commit.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

 Analogous JBD fix has been queued in my tree...

diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index 2e5d370..3a958c7 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -768,8 +768,13 @@ wait_for_iobuf:
                    required. */
 		JBUFFER_TRACE(jh, "file as BJ_Forget");
 		jbd2_journal_file_buffer(jh, commit_transaction, BJ_Forget);
-		/* Wake up any transactions which were waiting for this
-		   IO to complete */
+		/*
+		 * Wake up any transactions which were waiting for this IO to
+		 * complete. The barrier must be here so that changes by
+		 * jbd2_journal_file_buffer() take effect before wake_up_bit()
+		 * does the waitqueue check.
+		 */
+		smp_mb();
 		wake_up_bit(&bh->b_state, BH_Unshadow);
 		JBUFFER_TRACE(jh, "brelse shadowed buffer");
 		__brelse(bh);
-- 
1.7.1