Module Name: src
Committed By: riz
Date: Fri Aug 12 20:48:48 UTC 2011
Modified Files:
src/sys/arch/xen/xen [netbsd-5]: xbdback_xenbus.c
Log Message:
Pull up following revision(s) (requested by bouyer in ticket #1654):
sys/arch/xen/xen/xbdback_xenbus.c: revision 1.42
sys/arch/xen/xen/xbdback_xenbus.c: revision 1.43
sys/arch/xen/xen/xbdback_xenbus.c: revision 1.44
Make sure to call xbdback_trampoline() at splbio()
Several fixes to the continuation engine:
- make sure to enter the continuation loop at splbio(), and add some
KASSERT() for this.
- When a flush operation is enqueued to the workqueue, make sure the
continuation loop can't be restarted by a previous workqueue
completion or an event. We can't restart it at this point because
the flush even is still recorded as the current I/O.
For this add a xbdback_co_cache_doflush_wait() which acts as a noop;
the workqueue callback will restart the loop once the flush is complete.
Should fix "kernel diagnostic assertion xbd_io->xio_mapped == 0" panics
reported by Jeff Rizzo on port-xen@.
Add a comment explaing why a flush workqueue is handled differently from
read/write workqueue requests.
To generate a diff of this commit:
cvs rdiff -u -r1.20.4.5 -r1.20.4.6 src/sys/arch/xen/xen/xbdback_xenbus.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
