K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2014-12-08T16:48:57.329737Z
K 7
svn:log
V 532
Add functions syncer_suspend() and syncer_resume(), which are supposed
to be called before suspension and after resume, correspondingly.  The
syncer_suspend() ensures that all filesystems dirty data and metadata
are saved to the permanent storage, and stops kernel threads which
might modify filesystems.  The syncer_resume() restores stopped
threads.

For now, only syncer is stopped.  This is needed, because each sync
loop causes superblock updates for UFS.

Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week

END