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ocfs2: Wake up a starting region if it gets killed in the background.

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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>
This commit is contained in:
Joel Becker 2007-02-06 15:45:39 -08:00 committed by Mark Fasheh
parent 16c6a4f24d
commit e6df3a663a
1 changed files with 20 additions and 1 deletions
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21
fs/ocfs2/cluster/heartbeat.c
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@ -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);
}