[Cluster-devel] [GFS2 PATCH] GFS2: Don't delay TRY locks
Bob Peterson
rpeterso at redhat.com
Wed Oct 17 17:37:49 UTC 2012
Hi,
This patch changes the glock minimum hold time down to zero if
the glock is a "try" lock.
Regards,
Bob Peterson
Red Hat File Systems
Signed-off-by: Bob Peterson <rpeterso at redhat.com>
---
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 3f1df8b..98ae8a2 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -1289,6 +1289,7 @@ void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state)
unsigned long delay = 0;
unsigned long holdtime;
unsigned long now = jiffies;
+ const struct gfs2_holder *gh_head;
gfs2_glock_hold(gl);
holdtime = gl->gl_tchange + gl->gl_hold_time;
@@ -1301,6 +1302,12 @@ void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state)
}
spin_lock(&gl->gl_spin);
+ if (!list_empty(&gl->gl_holders)) {
+ gh_head = list_entry(gl->gl_holders.next,
+ const struct gfs2_holder, gh_list);
+ if (gh_head->gh_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB))
+ delay = 0;
+ }
handle_callback(gl, state, delay);
spin_unlock(&gl->gl_spin);
if (queue_delayed_work(glock_workqueue, &gl->gl_work, delay) == 0)
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