MFC r306613:
Note the change of name in FreeBSD 5.0.

PR: 212542
Approved by: bcr (mentor)
Differential Revision: https://reviews.freebsd.org/D8105

MFC r267667:
use .Mt to mark up email addresses consistently (part1)

PR: 191174
Submitted by: Franco Fichtner <franco at lastsummer.de>

MFC 287397:

Fix markup.

Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Remove trailing whitespace per mdoc lint warning

Disussed with: gavin
No objection from: doc
Approved by: joel
MFC after: 3 days

Fix SYNOPSIS.

Add a notice to the man page that batteries should be installed.

Allowed unionfs to use whiteout not supporting file system as
upper layer. Until now, unionfs prevents to use that kind of
file system as upper layer. This time, I changed to allow
that kind of file system as upper layer. By this change, you
can use whiteout not supporting file system (e.g., especially
for tmpfs) as upper layer. It's very useful for combination of
tmpfs as upper layer and read only file system as lower layer.

By difinition, without whiteout support from the file system
backing the upper layer, there is no way that delete and rename
operations on lower layer objects can be done. EOPNOTSUPP is
returned for this kind of operations as generated by VOP_WHITEOUT()
along with any others which would make modifica tions to the
lower layer, such as chmod(1).

This change is suggested by ed.

Submitted by: ed

Added whiteout behavior option. ``-o whiteout=always'' is default mode
(it is established practice) and ``-o whiteout=whenneeded'' is less
disk-space using mode especially for resource restricted environments
like embedded environments. (Contributed by Ed Schouten. Thanks)

Submitted by: Masanori Ozawa <ozawa@ongs.co.jp> (unionfs developer)
Reviewed by: jeff, kensmith
Approved by: re (kensmith)
MFC after: 1 week

Fix wrong markup and some wordsmithing.

Submitted by: ru

Many, many thanks to Masanori OZAWA <ozawa@ongs.co.jp>
and Daichi GOTO <daichi@FreeBSD.org> for submitting this
major rewrite of unionfs. This rewrite was done to
try to solve many of the longstanding crashing and locking
issues in the existing unionfs implementation. This
implementation also adds a 'MASQUERADE mode', which allows
the user to set different user, group, and file permission
modes in the upper layer.

Submitted by: daichi, Masanori OZAWA
Reviewed by: rodrigc (modified for minor style issues)

Sort sections.

Scheduled mdoc(7) sweep.

Mention the vfs.usermount sysctl.

Obtained from: NetBSD via DragonFly BSD
MFC after: 3 days

Mechanically kill hard sentence breaks.

Remove advertising clause from University of California Regent's license,
per letter dated July 22, 1999.

Approved by: core, imp

Uniformly refer to a file system as "file system".

Approved by: re

s/filesystem/file system/g as discussed on -developers

The .Nm utility

Remove whitespace at EOL.

Missed one mount_null(8) -> mount_nullfs(8) in previous commit.

Rename (after a repo-copy) some mount(8) programs:

mount_fdesc -> mount_fdescfs
mount_null -> mount_nullfs
mount_portal -> mount_portalfs
mount_umap -> mount_umapfs
mount_union -> mount_unionfs

mdoc(7) police: Er macro usage cleanup.

mdoc(7) police: use the new features of the Nm macro.

Use Fx macro wherever possible.

$Id$ -> $FreeBSD$

User reports that using mount_null destroyed his filesystem, I reply
that nullfs really doesn't work, he askes why this isn't noted for the
"dangerous" filesystems, I go "hmmm."

.Nm mount_union -> .Nm.

Fixed an example.

Another round of various man page cleanups.

BSD 4.4 Lite sbin Sources

Note: XNSrouted and routed NOT imported here, they shall be imported with
usr.sbin.