Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

Jail-mount MFC: r231265,r231267,r231269,r232059,r232186,r232247,
r232278,r232307,r232342

MFC r231265:
Introduce the "ruleset=number" option for devfs(5) mounts.
Add support for updating the devfs mount (currently only changing the
ruleset number is supported).
Check mnt_optnew with vfs_filteropt(9).

This new option sets the specified ruleset number as the active ruleset
of the new devfs mount and applies all its rules at mount time. If the
specified ruleset doesn't exist, a new empty ruleset is created.

MFC r231267 [1]:
Add support for mounting devfs inside jails.

A new jail(8) option "devfs_ruleset" defines the ruleset enforcement for
mounting devfs inside jails. A value of -1 disables mounting devfs in
jails, a value of zero means no restrictions. Nested jails can only
have mounting devfs disabled or inherit parent's enforcement as jails are
not allowed to view or manipulate devfs(8) rules.

Utilizes new functions introduced in r231265.

MFC r231269:
Allow mounting nullfs(5) inside jails.

This is now possible thanks to r230129.

MFC r232059 [1]:
To improve control over the use of mount(8) inside a jail(8), introduce
a new jail parameter node with the following parameters:

allow.mount.devfs:
allow mounting the devfs filesystem inside a jail

allow.mount.nullfs:
allow mounting the nullfs filesystem inside a jail

Both parameters are disabled by default (equals the behavior before
devfs and nullfs in jails). Administrators have to explicitly allow
mounting devfs and nullfs for each jail. The value "-1" of the
devfs_ruleset parameter is removed in favor of the new allow setting.

MFC r232186:
Analogous to r232059, add a parameter for the ZFS file system:

allow.mount.zfs:
allow mounting the zfs filesystem inside a jail

This way the permssions for mounting all current VFCF_JAIL filesystems
inside a jail are controlled wia allow.mount.* jail parameters.

Update sysctl descriptions.
Update jail(8) and zfs(8) manpages.

MFC r232247:
mdoc(7) stype - start new sentences on new line

MFC r232278 [1]:
Add procfs to jail-mountable filesystems.

MFC r232291:
Bump .Dd to reflect latest update

MFC r232307:
Add "export" to devfs_opts[] and return EOPNOTSUPP if called with it.
Fixes mountd warnings.

MFC r232342 (jamie) [2]:
Handle the case where a boolean parameter is also a node.

PR: bin/165515 [2]
Reviewed by: jamie [1]

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Fix '.Xr' ordering in SEE ALSO section.

Approved by: keramida (mentor)
MFC after: 3 days

Note that devfs(5) and fdescfs(5) both create /dev/fd file descriptors.

PR: 144534
Submitted by: Matthew Seaman <m.seaman at infracaninophile co uk>
Patch by: Matthew Seaman, keramida
Approved by: keramida (mentor)
MFC after: 1 week

devfs(5): Also mention when device nodes on ufs stopped working (6.0),
as requested by some people.

MFC after: 2 weeks

Clarify devfs manpages slightly.

mount(8): add xref to devfs(5)
devfs(5): change example to something more likely to be useful (it is not
necessary to mount a devfs on /dev manually, but for chroots/jails it is
often needed), mention since when devfs is preferred to device nodes on ufs

PR: 146600
MFC after: 2 weeks

Markup fixes.

Remove reference to mount_devfs(8), since mount(8) no longer
invokes this mount_devfs when mounting devfs file systems.

Mechanically kill hard sentence breaks and double whitespaces.

Deal with unsafe tab characters.

Assorted markup, spelling, and grammar fixes.

Explicitly state that mknod(8) can be used to undelete entries under devfs.

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

Approved by: re

More file system > filesystem

Removed whitespace at end-of-line; no content changes. I simply did
cd src/share; find man[1-9] -type f|xargs perl -pi -e 's/[ \t]+$//'

BTW, what editors are the culprits? I'm using vim and it shows
me whitespace at EOL in troff files with a thick blue block...

Reviewed by: Silence from cvs diff -b
MFC after: 7 days

mdoc(7) police: removed HISTORY info from the .Os call.

/devs -> /dev

PR: 25252
Submitted by: Christian Weisgerber <naddy@mips.inka.de>
Approved by: nik, phk (via nik)

mdoc(7) police: removed history info from the .Os FreeBSD call.

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

$Id$ -> $FreeBSD$

Various man page cleanup:

- Sort xrefs
- FreeBSD.ORG -> FreeBSD.org
- Be consistent with section names as outlined in mdoc(7).
- Other misc mdoc cleanup.

PR: doc/13144
Submitted by: Alexey M. Zelkin <phantom@cris.net>

.Sh AUTHOR -> .Sh AUTHORS according to mdoc specs.
Use .An/.Aq.

add missing cvs Id lines.

Get the HISTORY section right.

Actually add the man page.