sys/vfs/autofs: Include <sys/proc.h> for APRINTF()

sys/vfs/autofs: Test if curproc is NULL in debug print

autofs: Minimize non functional diff vs FreeBSD

autofs: Change email address (sync with FUSE and others)

kernel/vfs: Consistently check if MALLOC_DECLARE was defined.

Keep these checks even in _KERNEL context and even if <sys/malloc.h>
is included before. Helps a lot for userland testing.

sys/vfs/autofs: Drop <sys/bus.h>

Looks like this is no longer needed just to compile.

sys/vfs/autofs: Drop unused autofs_mount/autofs_softc fields

Drop unused ones which originate from FreeBSD.

sys/vfs/autofs: Whitespace cleanups

Use space rather than tab (originates from FreeBSD).

sys/vfs/autofs: Change u_xxx -> unsigned xxx

(ap->a_cmd and refcount apis are of u_xxx)

sys/kern: Make condvar(9) support mutex(9)

sys/vfs/autofs: Simplify vfs_root()

The root dir is created on mount time, and must exist by the time
vfs_root() is called.

sys/vfs/autofs: Change autofs_softc::sc_lock to use mutex(9)

sys/vfs/autofs: Add Copyright

sys/vfs/autofs: #if0 unsupported vfs.autofs.mount_on_stat

Keep the code since this should be implemented.

sys/vfs/autofs: Cleanups (sync with NetBSD and OpenBSD)

FreeBSD has these in autofs.c, but only vfsops needs init/uninit.

sys/vfs/autofs: Remove AUTOFS_ASSERT_*LOCKED()

These macros came from FreeBSD, but more readable without these.

sys/vfs/autofs: Change autofs_mount::am_lock to use mutex(9)

sys/vfs/autofs: Change autofs_node::an_vnode_lock to use mutex(9)

sys/vfs/autofs: Remove #if0'd export related code

Exporting is never going to be implemented.

sys/vfs/autofs: Cleanups

Remove <sys/stdbool.h>. The kernel has bool etc. in <sys/types.h> now.

autofs: Port autofs from FreeBSD

Brought in basically from
FreeBSD@GitHub cac9beab7d53f0c37ce2a2a1b893be59028928f4
with lots of changes.
Note that this commit isn't necessarily 1:1 with above commit

autofs: Port autofs from FreeBSD

Brought in basically from
FreeBSD@GitHub cac9beab7d53f0c37ce2a2a1b893be59028928f4
with lots of changes.
Note that this commit isn't necessarily 1:1 with above commit.

Kernel code is basically a rewrite based on the FreeBSD code.
Userspace is basically 1:1 with FreeBSD except that lots of small
changes (including related commits listed below) were necessary.
This is due to autofs being dependent on FreeBSD specific interface,
command options and such.

For userspace, note that non-functional stuff (e.g. whitespace
warnings via git am) are intentionally left to be 1:1 with FreeBSD.
Userspace is basically portable, so don't try to obfuscate the real
changes made for DragonFly by fixing these for now till things are
considered stable unless it's a bug from FreeBSD.

Summary of newly added or modified files.
- sys/vfs/autofs - autofs filesystem
- usr.sbin/autofs - autofs userspace command and daemons
- etc/ - configuration files and manpages
- others - changes in misc subsystems (not independent of autofs)

Related DragonFly commits.
- usr.sbin/autofs: Workaround namecache bug after unmount
- sys/kern: Don't implement .vfs_sync unless sync is supported
- user.sbin/fstyp: Port fstyp from FreeBSD
- sys/kern: Retry nlookup if nresolve returned ESTALE
- sys/sys: Fix IOCPARM_MAX
- sys/sys: Extend IOCPARM_MAX
- usr.bin/showmount: Add -E option
- sbin/mount_nfs: Add -o retrycnt= option
- sys/kern: Add kqueue EVFILT_FS
- sys/kern: Add kstrndup()

Related DragonFly PRs.
- https://bugs.dragonflybsd.org/issues/2900
- https://bugs.dragonflybsd.org/issues/2901
- https://bugs.dragonflybsd.org/issues/2905
- https://bugs.dragonflybsd.org/issues/2907
- https://bugs.dragonflybsd.org/issues/2908
- https://bugs.dragonflybsd.org/issues/2909
- https://bugs.dragonflybsd.org/issues/2912
- https://bugs.dragonflybsd.org/issues/2913
- https://bugs.dragonflybsd.org/issues/2914

Other related resource.
- http://lists.dragonflybsd.org/pipermail/users/2016-May/thread.html#249556
- http://lists.dragonflybsd.org/pipermail/users/2016-June/thread.html#249680
- https://www.dragonflydigest.com/2016/05/06/18066.html

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