From b7dc2df5725fe7355fd76000ead7e39728e1b8a9 Mon Sep 17 00:00:00 2001 From: Bob Peterson Date: Wed, 23 Jun 2010 11:44:47 -0400 Subject: GFS2: recovery stuck on transaction lock This patch fixes bugzilla bug #590878: GFS2: recovery stuck on transaction lock. We set the frozen flag on the glock when we receive a completion that cannot be delivered due to blocked locks. At that point we check to see whether the first waiting holder has the noexp flag set. If the noexp lock is queued later, then we need to unfreeze the glock at that point in time, namely, in the glock work function. This patch was originally written by Steve Whitehouse, but since he's on holiday, I'm submitting it. It's been well tested with a complex recovery test called revolver. Signed-off-by: Steve Whitehouse Signed-off-by: Bob Peterson --- fs/gfs2/glock.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'fs') diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c index ddcdbf49353..dbab3fdc258 100644 --- a/fs/gfs2/glock.c +++ b/fs/gfs2/glock.c @@ -706,8 +706,18 @@ static void glock_work_func(struct work_struct *work) { unsigned long delay = 0; struct gfs2_glock *gl = container_of(work, struct gfs2_glock, gl_work.work); + struct gfs2_holder *gh; int drop_ref = 0; + if (unlikely(test_bit(GLF_FROZEN, &gl->gl_flags))) { + spin_lock(&gl->gl_spin); + gh = find_first_waiter(gl); + if (gh && (gh->gh_flags & LM_FLAG_NOEXP) && + test_and_clear_bit(GLF_FROZEN, &gl->gl_flags)) + set_bit(GLF_REPLY_PENDING, &gl->gl_flags); + spin_unlock(&gl->gl_spin); + } + if (test_and_clear_bit(GLF_REPLY_PENDING, &gl->gl_flags)) { finish_xmote(gl, gl->gl_reply); drop_ref = 1; -- cgit v1.2.3