git: kernel - Implement QUICKHALT shortcut for unmounting during shutdown

[Matthew Dillon]

commit 51a529db74b2b342d44ffd3feab524929341896f
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Sun Mar 18 22:39:10 2018 -0700

    kernel - Implement QUICKHALT shortcut for unmounting during shutdown
    
    * Add the MNTK_QUICKHALT flag which allows the system to just unlink but
      otherwise ignore certain mount types during a halt or reboot.  For now
      we flag tmpfs, devfs, and procfs.
    
    * The main impetus for this is to reduce the messing around we
      do with devfs during a shutdown.  Devfs has its fingers, and its
      vnodes, prettymuch sunk throughout the system (e.g. /dev/null, system
      console, vty's, root mount, and so on and so forth).  There's no
      real need to attempt to unwind all of that mess nicely.

Summary of changes:
 sys/kern/kern_shutdown.c       |  2 +-
 sys/kern/vfs_subr.c            | 13 +++++++++----
 sys/kern/vfs_syscalls.c        | 39 +++++++++++++++++++++++++++++++++------
 sys/sys/mount.h                |  5 +++--
 sys/vfs/devfs/devfs_vfsops.c   |  1 +
 sys/vfs/mfs/mfs_vfsops.c       |  2 +-
 sys/vfs/nfs/nfs_kerb.c         |  2 +-
 sys/vfs/procfs/procfs_vfsops.c |  1 +
 sys/vfs/puffs/puffs_msgif.c    |  4 ++--
 sys/vfs/tmpfs/tmpfs_vfsops.c   |  1 +
 10 files changed, 53 insertions(+), 17 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/51a529db74b2b342d44ffd3feab524929341896f


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