From: Jan Kara Date: Thu, 5 May 2011 11:59:35 +0000 (+0200) Subject: jbd: Fix forever sleeping process in do_get_write_access() X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2842bb20eed2e25cde5114298edc62c8883a1d9a;p=linux-beck.git jbd: Fix forever sleeping process in do_get_write_access() 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. CC: stable@kernel.org Reported-by: Tao Ma Signed-off-by: Jan Kara --- diff --git a/fs/jbd/commit.c b/fs/jbd/commit.c index 69b180459463..f486ff697781 100644 --- a/fs/jbd/commit.c +++ b/fs/jbd/commit.c @@ -722,8 +722,13 @@ wait_for_iobuf: required. */ JBUFFER_TRACE(jh, "file as BJ_Forget"); 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 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);