Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
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 now unused G_TYPE_ASCNUM.

Introduce special G_VAL_OPTIONAL define, which when given in value field
tells geom(8) to ignore it when it is not given and don't try to obtain
default value.

Add G_TYPE_MULTI flag, which when set for the given option, will
allow the option to be specified multiple times. This will help to
implement things like passing multiple keyfiles to geli(8) instead of
cat(1)ing them all into stdin and reading from there using one '-k -'
option.

- Remove gc_argname field. It was introduced for gpart(8), but if I
understand everything correctly, we don't really need it.
- Provide default numeric value as strings. This allows to simplify
a lot of code.
- Bump version number.

- Allow to specify value as const pointers.
- Make optional string values always an empty string.

Remove G_TYPE_ASCLBA type and replace it with G_TYPE_STRING in gpart.
Move code that converts params from humanized numbers to sectors count
to subr.c and adjust comment.
Add post-processing for "size" and "start offset" params in gpart,
now they are properly converted to sectors count with known sector size
that can be greater that 512 bytes.
Also replace "unsigned long long" type to "off_t" for unify code since
it used for medium size in libgeom(3) and DIOCGMEDIASIZE ioctl.

PR: bin/146277
Reviewed by: marcel (previous version)
Approved by: kib (mentor)
MFC after: 1 month

Allow humanized numbers for LBAs, as well as partition indices for
gpart(8). LBAs in particular are ugly. The ganularity is a sector,
but users expect byte granularity when specifying the size or offset
with a SI unit. Handle LBAs specially to deal with this.

Bump G_LIB_VERSION to reflect the ABI change.

Pointed out by: pjd@

Add gpart(8).

In order to support gpart(8), geom(8) needs to support a named
argument. Also, optional string parameters are a requirement.
Both have been added to the infrastructure. The former required
all existing classes to be adjusted.

MFp4:

- Print proper error message when argument is specified twice.
Before the change it was detected properly, because of how
G_OPT_DONE() macro worked.
- Use err(3) functions where appropriate.
- Add some assertions.
- Bump version number, because G_TYPE_BOOL addition breaks API and ABI.

Changes: 98721,98722,98723,101360,106985

Remove trailing spaces.

- Add gc_usage field to g_command structure. This will allow to define
usage for a subcommand, so no 'usage' function has to be implemented
in class library.
- Bump version number as it breaks ABI, but don't provide backward
compatibility, because there are probably no external consumers of this
geom(8).
This allows to print more precise usage for standard commands and simplify
class libraries a bit.

MFC after: 1 week

Bring in geom(8) utility. It is an universal utility for operating on
GEOM classes. It works by loading a shared library via dlopen(3) mechanism
with class-specific code, it is also responsible for communicating with
GEOM via libgeom(3).
Per-class shared libraries are going to be stored in /lib/geom/ directory.
It provides also few standard commands like 'list', 'load' and 'unload'
for existing classes which aren't aware of geom(8).
More info will be send on freebsd-current@ mailing list.

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