MFC r336017,r338799

r336017
This exposes ZFS user and group quotas via the normal
quatactl(2) mechanism. (Read-only at this point, however.)
In particular, this is to allow rpc.rquotad query quotas
for NFS mounts, allowing users to see their quotas on the
hosts using the datasets.

The changes specifically:

* Add new RPC entry points for querying quotas.
* Changes the library routines to allow non-UFS quotas.
* Changes rquotad to check for quotas on mounted filesystems,
rather than being limited to entries in /etc/fstab
* Lastly, adds a VFS entry-point for ZFS to query quotas.

Note that this makes one unavoidable behavioural change: if quotas
are enabled, then they can be queried, as opposed to the current
method of checking for quotas being specified in fstab. (With
ZFS, if there are user or group quotas, they're used, always.)

r338799
Author: kib

Fix ZFS VFS op quotactl to follow busy protocol.

Approved by: mav
Sponsored by: iXsystems, inc

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

Merger of the quota64 project into head.

This joint work of Dag-Erling Smørgrav and myself updates the
FFS quota system to support both traditional 32-bit and new 64-bit
quotas (for those of you who want to put 2+Tb quotas on your users).

By default quotas are not compiled into the kernel. To include them
in your kernel configuration you need to specify:

options QUOTA # Enable FFS quotas

If you are already running with the current 32-bit quotas, they
should continue to work just as they have in the past. If you
wish to convert to using 64-bit quotas, use `quotacheck -c 64';
if you wish to revert from 64-bit quotas back to 32-bit quotas,
use `quotacheck -c 32'.

There is a new library of functions to simplify the use of the
quota system, do `man quotafile' for details. If your application
is currently using the quotactl(2), it is highly recommended that
you convert your application to use the quotafile interface.
Note that existing binaries will continue to work.

Special thanks to John Kozubik of rsync.net for getting me
interested in pursuing 64-bit quota support and for funding
part of my development time on this project.

printerr_reply() has never been used for as long as we've had this code in
our tree (13+ years). This is an excellent argument for aggressive use
of "static".

Other minor style issues.

Slight style cleanup.

Whitespace and style fixes, build at WARNS level 6.

MFC after: 3 weeks

Fix most cases where the address of an int is passed to a function expecting a
socklen_t * argument.

Eliminate last three uses of varargs.h in the tree. These three files
were including varargs.h file but did not use any of its macros,
so they escaped the clean-up before.

Port to TI/RPC and/or IPV6.

Submitted by: Jean-Luc Richier <Jean-Luc.Richier@imag.fr>

Spell void * as void * rather than caddr_t. This is complicated by the
fact that caddr_t is often misspelled as char *.

Sponsored by: DARPA, NAI Labs

o __P removal
o use new style prototypes and function definitions
o signal handlers need an argument. Mark it unused.

stat(2) filesystem quotas act on, not filesystem quotas file resides on.

PR: bin/4949
MFC after: 2 weeks

$Id$ -> $FreeBSD$

Cosmetics in man page. Add rcsid and sort #includes.

This commit was generated by cvs2svn to compensate for changes in r13237,
which included commits to RCS files with non-trunk default branches.

Obtained from: NetBSD
Imported rpc.rquotad from NetBSD - currently only used by the
quota-command to display quota's over nfs