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 r251516

Implement foreign device handling.

PR: kern/172091

MFC r237259 r237260 r237329:
Allow users with RO privilege to the device to read the RO attributes. [0]
Add __unused macros to appropriate places in order to allow building
with WARNS=6 on base gcc, gcc46, and clang

PR: bin/167302 [0]
Approved by: cperciva (implicit)

MFC r233713
Remove the magic mfi_array is 288 bytes and just use the
sizeof the array since it is not 288 bytes.

Change reporting of a "SYSTEM" disk to "JBOD" to match
LSI MegaCli and firmware reporting.

This means that mfiutil command to "create jbod" is now a
little confusing since a RAID per drive is not really what
LSI defines JBOD to be. This should be fixed in the future
and support added to really create LSI JBOD and enable that
feature on cards that support it.

MFC r227893 and r228119:

Avoid double free creating a new RAID with invalid command line
arguments.

In build_volume(), check if arrays is allocated before traversing its
items. While parsing the arrays input, it's possible that we reach the
error path before initializing the 'arrays' pointer, which in turn leads
to a NULL deference.

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

Approved by: re (implicit)

Add global -d and -e options to either print device numbers
(usually default) or enclosure:slot information as (Exx:Sxx)
or both.

Discussed with: jhb
Reviewed by: jhb
Sponsored by: Sandvine Incorporated
MFC after: 1 week

Contrary to when returning in all-good cases at the end of functions we
did not free memory (1) or close the file descriptor (2) in error cases.

Reported by: Mark Johnston (1)
Reported by: attilio (2)
Reviewed by: jhb
Sponsored by: Sandvine Incorporated
MFC after: 1 week

Handle malloc() failures more gracefully by error'ing out rather than
segfaulting.

Submitted by: gcooper
MFC after: 1 week

- Save errno values before calling warn(3) so that errors are correctly
reported.
- Use powerof2() from <sys/param.h> rather than a copy and paste version.

Submitted by: gcooper
MFC after: 1 week

Fix compile with -DDEBUG by using the correct mfi_pd_ref union definition
in mfireg.h.

Submitted by: gcooper
Reviewed by: jhb
Approved by: cperciva (mentor)
MFC after: 1 week

ntroduce mfiutil, a basic utility for managing LSI SAS-RAID & Dell PERC5/6
controllers. Controller, array, and drive status can be checked, basic
attributes can be changed, and arrays and spares can be created and deleted.
Controller firmware can also be flashed.

This does not replace MegaCLI, found in ports, as that is officially sanctioned
and supported by LSI and includes vastly more functionality. However, mfiutil
is open source and guaranteed to provide basic functionality, which can be
especially useful if you have a problem and can't get MegaCLI to work.

Approved by: re
Obtained from: Yahoo! Inc.