Kyle Evans
dca52ab480
posixshm: start counting writeable mappings ...
r351650 switched posixshm to using OBJT_SWAP for shm_object
r351795 added support to the swap_pager for tracking writeable mappings
Take advantage of this and start tracking writeable mappings; fd sealing
will use this to reject a seal on writing with EBUSY if any such mapping
exist.
Reviewed by: kib, markj
Differential Revision: https://reviews.freebsd.org/D21456
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