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 r256448, r257029;

Make di_blocks unsigned in UFS1 as is the case already for UFS2.
Most of the code between UFS1 and UFS2 is shared so this change
is pretty safe. Not only this makes UFS1 and 2 consistent but it
also matches what NetBSD and MacOS X have for some years now.

UFS2: make di_extsize unsigned.
di_extsize is the EA size and as such it should be unsigned.
Adjust related types for consistency.

Reviewed by: mckusick

Merge checked by: Glen Barber (gjb@)

MFC of 247212:
When running with the -d option, instrument fsck_ffs to track the number,
data type, and running time of its I/O operations.

No functional changes.

MFC of 247234:
Catch up with internal API changes for initbarea() and getdatablk()
of fsck_ffs introduced with r247212.

Submitted by: David Wolfskill <david@catwhisker.org>

MFC of 248625:
Speed up fsck by caching the cylinder group maps in pass1 so
that they do not need to be read again in pass5. As this nearly
doubles the memory requirement for fsck, the cache is thrown away
if other memory needs in fsck would otherwise fail. Thus, the
memory footprint of fsck remains unchanged in memory constrained
environments.

This work was inspired by a paper presented at Usenix's FAST '13:
www.usenix.org/conference/fast13/ffsck-fast-file-system-checker

Details of this implementation appears in the April 2013 of ;login:
www.usenix.org/publications/login/april-2013-volume-38-number-2.
A copy of the April 2013 ;login: paper can also be downloaded
from: www.mckusick.com/publications/faster_fsck.pdf.

Reviewed by: kib
Tested by: Peter Holm

MFC of 248639:
Fix the build after addition of cylinder group cacheing (r248625)

Reported by: Glen Barber (gjb@)
Pointy hat to: Kirk McKusick (mckusick@)

MFC of 248673:
Minor formatting fix for printf() to fix clang builds.

Submitted by: db
Reviewed by: gjb

MFC of 248680:
Resolve clang compile errors on amd64/i386 for certain by casting.

compile tested with clang on i386, amd64
compile tested with gcc on i386, amd64, sparc64

Submitted by: delphij

MFC of 248691:
Note that output is in seconds, not msec.
KNF indentation.
No functional change.
No change to printf strings.
No change to casting of printf arguments.

Reported by: Bruce Evans

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

Approved by: re (implicit)

Mechanical whitespace cleanup.

MFC after: 3 weeks

Use __FBSDID() to quiet GCC 3.3 warnings.

Add a source file where EXTATTR checks will happen and hook it in even
if it doesn't do anything yet.

Sponsored by: DARPA & NAI Labs.