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authorJoel Becker <joel.becker@oracle.com>2007-02-06 15:45:39 -0800
committerMark Fasheh <mark.fasheh@oracle.com>2007-07-10 17:19:46 -0700
commite6df3a663a5d1ee68aeae7f007197f272700d9cc (patch)
treee484382e0ae46553febd3dd56c0f8a9e882ec71b
parent16c6a4f24de2933b26477ad5dfb71f518220d641 (diff)
ocfs2: Wake up a starting region if it gets killed in the background.
Tell o2cb_region_dev_write() to wake up if rmdir(2) happens on the heartbeat region while it is starting up. Then o2hb_region_dev_write() can check to see if it is alive and act accordingly. This prevents a hang (not being woken) and a crash (if it's woken by a signal). Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
-rw-r--r--fs/ocfs2/cluster/heartbeat.c21
1 files changed, 20 insertions, 1 deletions
diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c
index 2877d468f11..2bd7f788cf3 100644
--- a/fs/ocfs2/cluster/heartbeat.c
+++ b/fs/ocfs2/cluster/heartbeat.c
@@ -1335,6 +1335,7 @@ static ssize_t o2hb_region_dev_write(struct o2hb_region *reg,
ret = wait_event_interruptible(o2hb_steady_queue,
atomic_read(&reg->hr_steady_iterations) == 0);
if (ret) {
+ /* We got interrupted (hello ptrace!). Clean up */
spin_lock(&o2hb_live_lock);
hb_task = reg->hr_task;
reg->hr_task = NULL;
@@ -1345,7 +1346,16 @@ static ssize_t o2hb_region_dev_write(struct o2hb_region *reg,
goto out;
}
- ret = count;
+ /* Ok, we were woken. Make sure it wasn't by drop_item() */
+ spin_lock(&o2hb_live_lock);
+ hb_task = reg->hr_task;
+ spin_unlock(&o2hb_live_lock);
+
+ if (hb_task)
+ ret = count;
+ else
+ ret = -EIO;
+
out:
if (filp)
fput(filp);
@@ -1523,6 +1533,15 @@ static void o2hb_heartbeat_group_drop_item(struct config_group *group,
if (hb_task)
kthread_stop(hb_task);
+ /*
+ * If we're racing a dev_write(), we need to wake them. They will
+ * check reg->hr_task
+ */
+ if (atomic_read(&reg->hr_steady_iterations) != 0) {
+ atomic_set(&reg->hr_steady_iterations, 0);
+ wake_up(&o2hb_steady_queue);
+ }
+
config_item_put(item);
}