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

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

MFC r234846:

Improve growfs(8) in a few ways; unfortunately, it's somewhat hard to untangle
them and commit separately.

1. Rewrite the way growfs(8) finds the device and mount point. This makes
it possible to use e.g. "growfs /mnt"; it's also used to display more
helpful messages.

2. Be more user-friendly, using descriptive messages, like this:

OK to grow filesystem on /dev/md0, mounted on /mnt, from 9.8GB to 20GB? [Yes/No]"

3. Allow to specify the size (-s option) just like with mdconfig(8), i.e. with
postfixes ("mdconfig -s 10g").4. Reload read-only filesystem after growing.

Reviewed by: kib, mckusick (earlier version)
Sponsored by: The FreeBSD Foundation

MFC r235079:

Fix offset calculation to actually rewrite the _last_ block.

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

Approved by: re (implicit)

Switch the default WARNS level for sbin/ to 6.

Submitted by: Ulrich Spörlein

Don't define FS_DEBUG by default, as this causes growfs to write debugging
information to /tmp/growfs.debug, which is a world-writable directory.

MFC after: 3 days
Reported by: Jon Passki <cykyc@yahoo.com>

For variables that are only checked with defined(), don't provide
any fake value.

Catch up with recent gcc changes and introduce a DIP_SET macro
to use when setting values that depend on the UFS version.
Raise WARNS again.

Downgrade WARNS level until GCC 3.4.2 warning are fixed.

It seems growfs(8) is now WARNS?=6 safe.

Tested on: alpha, i386, ia64, sparc64

Temporarily go back to WARNS=0 until I can figure out what's breaking
the {powerpc, sparc64, ia64} tinderboxes.

Sorry for the noise. :-(

Make growfs WARNS=6 clean.

Approved by: grog (mentor)

Remove these MAINTAINER lines since the maintainers has had their
commit bits retired for safe keeping.

style clean.

Default to WARNS=2.
Binary builds that cannot handle this must explicitly set WARNS=0.

Reviewed by: mike

- Backout botched attempt to introduce MANSECT feature.
- MAN[1-9] -> MAN.

Set the default manual section for sbin/ to 8.

added growfs(8) including ffsinfo(8) to the freebsd base system

Reviewed by: grog