K 10
svn:author
V 6
kevans
K 8
svn:date
V 27
2019-09-03T20:33:38.891584Z
K 7
svn:log
V 415
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

END