FreeBSD/src d1cbf3e (r353469)sys/kern vfs_subr.c, sys/sys mount.h

vfs: add MNTK_NOMSYNC

On many filesystems the traversal is effectively a no-op. Add a way to avoid
the overhead.

Reviewed by:    kib
Sponsored by:   The FreeBSD Foundation
Differential Revision:  https://reviews.freebsd.org/D22009
DeltaFile
+3-0sys/kern/vfs_subr.c
+1-0sys/sys/mount.h
+4-02 files

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