Revert r330897:

This was intended to be a non-functional change. It wasn't. The commit
message was thus wrong. In addition it broke arm, and merged crypto
related code.

Revert with prejudice.

This revert skips files touched in r316370 since that commit was since
MFCed. This revert also skips files that require $FreeBSD$ property
changes.

Thank you to those who helped me get out of this mess including but not
limited to gonzo, kevans, rgrimes.

Requested by: gjb (re)

Partial merge of the SPDX changes

These changes are incomplete but are making it difficult
to determine what other changes can/should be merged.

No objections from: pfg

MFC r310092:

Add a free_iovec() function to reset iovec's.

The primary purpose is to call nmount() in a loop with new iovec's so
free_iovec takes arguments by reference and resets their values.

Reviewed by: cem
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D8513

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

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

- Clean up checkpath().
- Remove unneeded sysexits.h include.

No functional change.

Submitted by: bde

Change checkpath() to not exit on error. This is a prerequisite for
fixing the mount(8) "failok" option.

PR: 163668
Reviewed by: Garrett Cooper, delphij (previous version)

style(9)

In build_iovec(), if passed in len is -1, check to see if
val is NULL before doing strlen() to calculate new len.

Submitted by: maxim

- Make size parameter to build_iovec() a size_t, not an int
- Add build_iovec_argf() helper function, for help converting old
mount options which used the mount_argf() function for the mount() syscall.

Discussed with: phk

Switch from K&R-style C prototypes to ISO/ANSI-style C prototypes.

Avoid comparing pointer against a numerical value by adding a * in
front of it.

Reviewed by: phk

Add a convenience function for building nmount iov arrays.

Fix bug: don't let "synco" match "sync"

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

Approved by: core, imp

Style change

Use __FBSDID() to quiet GCC 3.3 warnings.

mount* fixes from Martin Blapp <mb@imp.ch>:

Made mount more userfriendly (bad slashes are now filtered out)
and we remove in mount_nfs trailing slashes if there are any.

Fixed mount_xxx binarys to resolve with realpath(3)
the mountpoint.

Translate the deprecated nfs-syntax with '@' to ':' .
The ':' syntax has now precedence, but '@' still works.
Notify the user that the '@' syntax should not be used.

PR: 7846
PR: 13692
Submitted by: Martin Blapp <mb@imp.ch>
Reviewed by: phk

$Id$ -> $FreeBSD$

Remove unused #includes. Spelling. Add rcsid. Do not dot terminate err()
strings.

Try to avoid mounting filesystems multiple times. Also while
I'm here do some -Wall cleaning.

PR: kern/1839
Reviewed and corrected by: joerg

Fix parsing of mount options with '=' in their name.
PR: bin/3027
Submitted by: Louis Mamakos <louie@TransSys.COM>

Merge from Lite2
- use new getvfsbyname() interface and mount(2) interface

**DANGER WILL ROBINSON!!** You must be running a -current kernel
from within a week or so in order for this to work!

Add support for filesystem-specific `-o' options, and re-implement the
most common cd9660 and nfs options like God intended them. (It is now
possible to say

mount -o ro,soft,bg,intr there:/foo/bar /foo/bar

again.) This whole getmntopt() business is an incredible botch;
it never should have been anything more than a wrapper around
getsubopt(3). Because if the way the current hackaround is implemented,
options which take arguments (like the old `rsize' and `wsize') are still
unavailable, and must be accessed the new, broken way.

(It's unimaginable how Berkeley managed to screw up one of the few things
about NFS that Sun actually got right to begin with!)

Add code to skip "userquota"/"groupquota" options needed for
quotaon/quotacheck

This commit was generated by cvs2svn to compensate for changes in r1558,
which included commits to RCS files with non-trunk default branches.

BSD 4.4 Lite sbin Sources

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