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When a slot becomes free, call wake_up_locked regardless of the number
of slots available.
Without this patch, wake_up_locked is only called when going from no
free slots to one. This means that there is a chance a waiting task
will not be woken up. In many cases, the system will bounce between 0
and 1 free slots, and the waiting tasks will be woken up. But if there
is still a waiting task and another slot becomes available before the
number of free slots reaches zero, that waiting task may never be woken
up since the number of free slots may never reach zero again.
The bug behavior is easy to reproduce with the following script,
where /mnt/orangefs is an OrangeFS file system.
for i in {1..100}; do
for j in {1..20}; do
dd if=/dev/zero of=/mnt/orangefs/tmp$j bs=32768 count=32 &
done
wait
done
Signed-off-by: David Reynolds <david@omnibond.com>
Reviewed-by: Martin Brandenburg <martin@omnibond.com>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
c2676ef801