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| author | Bob Peterson <rpeterso@redhat.com> | 2014-03-12 10:32:20 -0400 |
|---|---|---|
| committer | Steven Whitehouse <swhiteho@redhat.com> | 2014-03-12 14:45:48 +0000 |
| commit | 01b172b7b10146cf5f02604047bee065cfb49946 (patch) | |
| tree | 44fd794c8d68bd1ebc7d330877eb5aa7e5c8de8c /fs/gfs2/glock.c | |
| parent | 48f8f711edf3868fe4faa28a19f07acb43532c4a (diff) | |
| download | linux-01b172b7b10146cf5f02604047bee065cfb49946.tar.gz linux-01b172b7b10146cf5f02604047bee065cfb49946.tar.bz2 linux-01b172b7b10146cf5f02604047bee065cfb49946.zip | |
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/glock.c')
| -rw-r--r-- | fs/gfs2/glock.c | 8 |
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); |