- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

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

Revert the entry point label to 'start' to unbreak the build.

Pointy hat to: jhb

- Remove the fake BPB from zfsldr. zfsldr doesn't support booting from
floppies, so it will not be used as the start of an emulated floppy
image on a bootable CD which is what the fake BPB was used for.
- Only check that EDD packet mode is available once at the start of
zfsldr rather than for each disk sector now that we read data in one
sector at a time. As a result, collapse the remaining bits of read
up into nread and rename nread to read.
- Restore a return at the end of putstr that I removed in the previous
revision.

Tested by: Henri Hennebert (earlier version)
MFC after: 1 week

The recent change to increase the zfsboot size to 64k made a few BIOSes
unhappy (probably they don't handle crossing the 64k boundary, etc.).
Fix this by changing zfsldr to use a loop reading from the disk one
sector at a time. To avoid trashing the saved copy of the MBR which is
used for disk I/O, read zfsboot2 at address 0x9000. This has the
advantage that BTX no longer needs to be relocated as it is read into
the correct location. However, the loop to relocate zfsboot2.bin can
now cross a 64k boundary, so change it to use relative segments instead.
(This will need further work if zfsboot2.bin ever exceeds 64k.)

While here, stop storing a relocated copy of zfsldr at 0x700. This was
only used by the xread hack which has recently been removed (and even
that use was dubious). Also, include the BIOS error code as hex when
reporting read errors to aid in debugging.

Much thanks to Henri Hennebert for patiently testing various iterations
of the patch as well as fixing the zfsboot2.bin relocation to use
relative segments.

MFC after: 1 week

Due to space constraints, the UFS boot2 and boot1 use an evil hack where
boot2 calls back into boot1 to perform disk reads. The ZFS MBR boot blocks
do not have the same space constraints, so remove this hack for ZFS.
While here, remove commented out code to support C/H/S addressing from
zfsldr. The ZFS and GPT bootstraps always just use EDD LBA addressing.

MFC after: 2 weeks

The size of zfsboot2 grown up to 64 Kbytes in r219089.
Increase NSECT up to 128 sectors too.

Reviewed by: jhb, pjd

Always use 64-bit LBAs for disk addresses in zfsboot and gptzfsboot to
fully support booting from large volumes.

Tested by: Emil Smolenski ambsd of raisa.eu.org
Submitted by: Matt Reimer mattjreimer of gmail (most of the C bits)
MFC after: 1 week

Update ZFS from version 6 to 13 and bring some FreeBSD-specific changes.

This bring huge amount of changes, I'll enumerate only user-visible changes:

- Delegated Administration

Allows regular users to perform ZFS operations, like file system
creation, snapshot creation, etc.

- L2ARC

Level 2 cache for ZFS - allows to use additional disks for cache.
Huge performance improvements mostly for random read of mostly
static content.

- slog

Allow to use additional disks for ZFS Intent Log to speed up
operations like fsync(2).

- vfs.zfs.super_owner

Allows regular users to perform privileged operations on files stored
on ZFS file systems owned by him. Very careful with this one.

- chflags(2)

Not all the flags are supported. This still needs work.

- ZFSBoot

Support to boot off of ZFS pool. Not finished, AFAIK.

Submitted by: dfr

- Snapshot properties

- New failure modes

Before if write requested failed, system paniced. Now one
can select from one of three failure modes:
- panic - panic on write error
- wait - wait for disk to reappear
- continue - serve read requests if possible, block write requests

- Refquota, refreservation properties

Just quota and reservation properties, but don't count space consumed
by children file systems, clones and snapshots.

- Sparse volumes

ZVOLs that don't reserve space in the pool.

- External attributes

Compatible with extattr(2).

- NFSv4-ACLs

Not sure about the status, might not be complete yet.

Submitted by: trasz

- Creation-time properties

- Regression tests for zpool(8) command.

Obtained from: OpenSolaris