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authorBob Peterson <rpeterso@redhat.com>2014-03-12 10:32:20 -0400
committerSteven Whitehouse <swhiteho@redhat.com>2014-03-12 14:45:48 +0000
commit01b172b7b10146cf5f02604047bee065cfb49946 (patch)
tree44fd794c8d68bd1ebc7d330877eb5aa7e5c8de8c /fs/gfs2
parent48f8f711edf3868fe4faa28a19f07acb43532c4a (diff)
downloadlinux-01b172b7b10146cf5f02604047bee065cfb49946.tar.bz2
GFS2: Ensure workqueue is scheduled after noexp request
This patch closes a small timing window whereby a request to hold the transaction glock can get stuck. The problem is that after the DLM has granted the lock, it can get into a state whereby it doesn't transition the glock to a held state, due to not having requeued the glock state machine to finish the transition. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2')
-rw-r--r--fs/gfs2/glock.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 52f747858f55..aec7f73832f0 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -1047,9 +1047,13 @@ int gfs2_glock_nq(struct gfs2_holder *gh)
spin_lock(&gl->gl_spin);
add_to_queue(gh);
- if ((LM_FLAG_NOEXP & gh->gh_flags) &&
- test_and_clear_bit(GLF_FROZEN, &gl->gl_flags))
+ if (unlikely((LM_FLAG_NOEXP & gh->gh_flags) &&
+ test_and_clear_bit(GLF_FROZEN, &gl->gl_flags))) {
set_bit(GLF_REPLY_PENDING, &gl->gl_flags);
+ gl->gl_lockref.count++;
+ if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
+ gl->gl_lockref.count--;
+ }
run_queue(gl, 1);
spin_unlock(&gl->gl_spin);