ChangeLog

2010-08-13 Brian Behlendorf <behlendorf1@llnl.gov>

	* : Tag zfs-0.5.0

	* : The ChangeLog is being retired.  Please use the git commit
	logs for a full records of changes: 'git log --no-merges'

2010-05-21 Brian Behlendorf <behlendorf1@llnl.gov>

	* : Tag zfs-0.4.9 - Use 'git log --no-merges' for full change log.

	 * : Build system improvements:
	- Added support for the 'make -s' silent build option.
	- Allow zfs_config.h to be included by dependent packages.
	- Minor spec file updates.
	- Minor build system message updates.

	* : Topic branch cleanup.  Several old branches were removed and
	numerous hunks which were accidentaly commited to incorrect topic
	branches in the past were relocated to the correct topic branch.

	* *.c, *.h, *.sh, AUTHORS, COPYING, COPYRIGHT, DISCLAIMER, README:
	Added standard header to source files which includes the copyright,
	license, and author information.  Additionally, updated the listed
	top level files to the latest versions.

	* cmd/zpool/zpool_vdev.c: Check all partitions with check_file()
	even when no libblkid is found.  This oversight would result in
	ZFS not detecting existing filesystems on partitions.

	* module/zfs/fm.c, module/zfs/zfs_fm, libzfs/libzfs_pool.c:
	Added zevents which are similar to Solaris FMA support.  The
	existing FMA and sysevent call points in ZFS were unified in
	to a single event type and used to create a user space visible
	event notification system under Linux.  The new 'zpool events'
	command can be used to show all recent ZFS events.

	* module/zfs/spa.c, module/zfs/zil.c: Suppress large memory
	allocation warnings for two particular kmem_alloc()'s.  For
	now we can live with them as is but long term a way should be
	found to perform small allocations or use the vmem based slab.

	* module/zfs/zvol.c: Recreate volume and snapshot /dev links during
	module load.  Links in /dev for volumes/snapshots were only being
	created at volume/snapshot creation time.  Those links are now also
	created dynamically at module load time based on the spa config.

	* module/zfs/zvol.c, module/zfs/include/sys/blkdev.h: The handler
	zvol_request() should use the unlocked version of blk_end_request()
	to avoid a deadlock in the ZVOL.

2010-03-11 Brian Behlendorf <behlendorf1@llnl.gov>

	* : Tag zfs-0.4.8 - Use 'git log --no-merges' for full change log.

	* : Build system improvements:
	- Remove Module.markers and Module.symver{s} in clean target.
	- Improved kernel source detection when none specified.
	- Fix RPM definitions for the unknown distro/installation.
	- Check for spl in ../spl if not found in install path.
	- Include all headers regardless of depth in packages.
	- Allow recursive configure/make.

	* lib/libzpool/kernel.c: Fixed several zdb bugs when opening a pool
	- zdb wasn't getting the correct device size when the vdev is a
	  block device.  In Solaris, fstat64() returns the device size but
	  in Linux an ioctl() is needed.
	- make sure that we don't try to open a block device in write mode
	  from userspace.  This shouldn't happen, because zdb opens devices
	  in read-only mode, and ztest only uses files.

	* lib/libspl/include/umem.h: Add umem_alloc_aligned() and honor
	cache_align field for umem cache.  Under linux we open block devices
	with O_DIRECT which means we must provide aligned memory buffers.

	* lib/libzpool/kernel.c: Fix some incorrect error handling.  In
	vn_open(), if fstat64() returned an error, the real errno was being
	obscured by calling close().

	* scripts/*: Fix scripts to work when invoked from other directories.

	* module/zfs/arc.c: Fix struct ht_lock padding in arc.c.

	* lib/libefi/include/sys/uuid.h: Fix duplicate uuid_t typedef.

	* module/zfs/txg.c: Use CPU percentages for number of commit cb
	threads.  This doesn't change number of threads in the kernel, but it
	reduces number of threads in ztest (important due to 32-bit address
	limitations).

	* cmd/ztest/ztest.c: Clean up emulation of kernel threads in
	userspace.  Updated to use pthread thread specific data rather than
	keeping a global list.  This also fixes at least one easily
	reproducible crash in ztest

	* META, config/kernel.m4: Add configure check for kernel build
	options which are incompatible with the license.  If your building
	against a kernel deemed incompatible configure will fail and
	suggest how you should rebuild your kernel.

	* config/kernel-fmode-t.m4: Linux 2.6.28 compat, add a check for the
	fmode_t type.  This typedef first appears in 2.6.28 kernels as part
	of some block device operation reworking.

	* module/zfs/dmu_send.c: No inline to keep dmu_recv_stream() stack
	frame less than 1024 bytes.  Recent builds against 2.6.31 flagged
	dmu_recv_stream() as stack heavy.  Further analysis of this function
	should be performed to further reduce its stack usage.

	* scripts/common.sh: Split the udev rule from a specific configuration
	by providing a generic 60-zpool.rules file which uses a small helper
	util 'zpool_id' to parse a configuration file by default located in
	/etc/zfs/zdev.conf.  The helper script maps a by-path udev name to a
	more friendly name of <channel><rank> for large configurations.

	Additionally, when running zpool-create.sh in-tree it will no longer
	use udev because we would have to copy certain helper scripts in to
	the installed system.  To avoid this the config file in simply
	parsed and symlinks are created in your working tree.  The script
	will use udev if it as run as part of an installed zfs-test package.

	* module/zfs/zvol.c: Use check_disk_change() instead of
	revalidate_disk().  For 2.6.27 kernels are earlier revalidate_disk()
	was not available.  However, check_disk_change() has been available
	for far longer and will properly inform the kernel of the volume
	change for both older and newer kernels.

	* module/zfs/dmu.c: Fixed incorrect ASSERT3S() added by ZVOL.

	* module/zfs/vdev_raidz.c, module/zfs/zvol.c: Minor fixes for 32-bit.

	* scripts/zfs-update.sh, man/man8/*: Added man pages based on the
	latest documentation and modified zfs-update.sh script to update them.

	* .gitignore: Updated .gitignore rules to exclude build products.

2009-11-24 Brian Behlendorf <behlendorf1@llnl.gov>

	* : Tag zfs-0.4.7 - Use 'git log --no-merges' for full change log.

	* module/zcommon/include/sys/fs/zfs.h, module/zfs/include/sys/blkdev.h,
	  module/zfs/include/sys/dmu.h, module/zfs/dmu.c,
	  module/zfs/include/sys/zvol.h, module/zfs/zvol.c,
	  module/zfs/zfs_ioctl.c:
	Added the ZVOL block device, with the addition of the ZVOL real ZFS
	based block devices are available and can be compared head to head
	with Linux's MD and LVM block drivers.  The Linux ZVOL has not yet
	had any performance work done but from a user perspective it should
	be functionally complete and behave like any other Linux block device.
	The ZVOL has so far been tested using zconfig.sh on the following
	x86_64 based platforms: FC11, CHAOS4, RHEL5, RHEL6, and SLES11.
	However, more testing is required to ensure everything is working
	as designed.

	* scripts/udev-rules/99-zpool.rules.promise,
	  scripts/zpool-config/promise-raid0-1x16.sh,
	  scripts/zpool-config/promise-raid10-8x2.sh,
	  scripts/zpool-config/promise-raidz-2x8.sh,
	  scripts/zpool-config/promise-raidz2-2x8.sh:
	Additional test configurations for a small 16 drive JBOD.

	* module/zfs/arc.c: Linux 2.6.31 compat, mutexes can now exceed 64
	bytes depending on the the kernel build options.  To account for
	this increase the pad size to 256 bytes.

	* module/zfs/vdev_disk.c: Linux 2.6.31 compat, to get the hard
	sector size use bdev_logical_block_size() this function replaces
	bdev_hardsect_size().

	* module/zfs/zfs_rlock.c: Prevent gcc uninit compiler warning in
	zfs_range_unlock_reader().

	* Makefile.am: Ensure *.order and *.markers build products are
	removed by distclean rule.

2009-11-02 Brian Behlendorf <behlendorf1@llnl.gov>

	* : Tag zfs-0.4.6 - Use 'git log --no-merges' for full change log.

	* Rebased to ZFS b121 from OpenSolaris.

	* module/zfs/vdev_disk.c: Finally a feature complete implementation:
	- Handle dynamic bio merge_bdev limitations when constructing the
	bio set associated with a dio.  This previously prevented us from
	layering cleanly on the md and dm virtual devices.
	- Removed hard coded 512 byte sector size.
	- Correctly determine the device size when using a partition.
	- Hold and extra dio reference when submitting bio's using
	bio_submit() to prevent a completion race.

	* lib/libefi/*: Added fully function libefi library from Solaris.
	This allows us to properly create and access GPT style partition
	tables which are used when a whole device is added to a zpool.

	* cmd/zpool/zpool_vdev.c: Fully integrated zpool with Linux package
	libblkid.  This allows zpool to identify existing devices of
	various types to prevent devices from accidentally being used.  When
	given a whole device with a GPT partition table all partitions will
	be checked for existing filesystems.  At the moment MBR style
	partition tables cannot be check and the force option must be used.

	* cmd/zpool/zpool_vdev.c: Solaris devid support has been removed in
	favor of Linux's udev.  This means that a zpool device will always be
	opened using the path provided at configuration time.  This may
	initially seem limiting but it has certain advantages:
	- When creating a zpool where the physical location of the device
	is NOT import simply create the pool using the /dev/disk/by-id paths.
	This will ensure that regardless of physical location the device
	will be properly located.
	- When creating a zpool where the physical location of the device
	is important use the /dev/disk/by-path paths.  This will ensure that
	devices are never accidentally detected and used in an incorrect
	location which would compromise the redundancy of the system.
	- Ever better you can create use your own udev rules file to setup
	any mapping and naming convention you desire.  One example of a
	custom rule is to map physical device locations using grid with
	numbers are letter for coordinates.  Each letter might represent
	a specific bus/channel and each number a specific device.  For large
	configurations this provides an easy way to identify devices.

	* module/zpios/zpios.c: Update to use kobject_set_name() for
	increased portability.

	* modules/*/*: Update module init/exit access points to use
	spl_module_{init,exit}() macro API.  This ensures the cwd is
	immediately set to '/' and may be leveraged latter for any
	additional module setup/cleanup which is required.

	* cmd/ztest/ztest.c: Check ftrucate() return code to prevent
	warnings when --fortify-source options is used in rpm builds.

	* config/Rules.am: Set DEBUG/NDEBUG globally when building user
	space components.

	* scripts/zconfig.sh: Initial hook for running additional sanity
	tests are part of 'make check'.  Currently, there are only two
	tests which do some basic configuration checking but they should
	be extended as much as possible to prevent regressions.  Tests
	should also all be written so they run entirely in-tree.

	* scripts/zpios-sanity.sh: Initial hook for validating real IO
	using all block devices and all raid configurations.  Supported
	device types include scsi, ide, md, dm, ram, loop, and file. 
	Supported raid types include raid0, raid10, raidz, and raidz2.

	* scripts/zpool-config/*: Update dragon and x4550 configs to use
	custom udev rules file with <A-Z><1-N> naming convention.  Add
	configs for md, dm, and ram block devices to verify functionality.

	* zfs-test.spec.in: Added zfs-test package which extends the existing
	in-tree test infrastructure such that it can be run as part of an
	installed package.  This simplifies the testing of tagged releases.

	* zfs-modules.spec.in: Various spec file tweaks for the supported
	distros: RHEL5, RHEL6, SLES10, SLES11, Chaos4, Fedora 11.

2009-08-04 Brian Behlendorf <behlendorf1@llnl.gov>

	* : Tag zfs-0.4.5 - Use 'git log --no-merges' for full change log.

	* FC11 and SLES11 support: This includes all compatibility changes
	to support 2.6.29 based kernels and the required build system
	improvements.
	* lib/libspl/asm-generic/atomic.c: Generic user space atomic support.
	* module/zpios/zpios.c: Register a basic compat ioctl handler for
	32-bit user vs 64-bit kernel compatibility.  This is the default
	build environment for all 64-bit SLES systems.  Additionally
	replace the use of 'struct timespec' which uses longs internally
	and is therefore different sizes on 32-bit vs 64-bit objects with
	'struct zpios_timespec_t'.a
	* config/kernel.m4: Check arch/default path when detecting kernel
	objects under SLES.  We still preferentially use arch/arch if
	available but if that fails it is acceptable to use default.
	* config/kernel.m4: Remove LINUXINCLUDE from autoconf wrapper.
	This breaks the 2.6.28+ kernels build system, all kernel build systems
	at least post 2.6.16 will set this properly so we should not.
	* lib/libspl/include/assert.h: Add ASSERTV macro to simplify removing
	variables (the V in ASSERTV) which are only used in ASSERT().
	Also revert all previously modified ASSERT()s to their original
	definitions and use the ASSERTV macro to handle unused variables.
	* module/zpios/zpios.c: Use spl device interfaces for portability.
	* scripts/common.sh: The losetup -f option is unavailable for
	SLES10 use the unused_loop_device() common function.  Additionally
	LOSETUP is now used to portably reference the losetup binary.
	* module/zfs/vdev_disk.c: Unused destroy_dirty_buffers arg removed.
	* module/zfs/vdev_disk.c: BIO_RW_SYNC renamed to BIO_RW_SYNCIO.
	* module/zfs/vdev_disk.c: open/close_bdev_excl() renamed to
	open/close_bdev_exclusive().
	* module/zfs/vdev_disk.c: Empty write barriers are supported as of
	linux 2.6.24 and are now used to implement DKIOCFLUSHWRITECACHE.
	* module/zfs/vdev_disk.c: The bi_end_io API changes make partial
	IO's impossible handle this case cleanly.
	* module/zfs/vdev_disk.c: BIO_RW_FAILFAST replaced with
	BIO_RW_FAILFAST_{DEV|_TRANSPORT|_DRIVER}, use the legacy
	BIO_RW_FAILFAST flag if it exists for now.
	* module/zfs/dmu_objset.c, module/zfs/spa_history.c: Excessively
	large stack frames (>2048) were detected in dmu_objset_snapshot()
	and spa_history_log() and were reduced by allocating from the heap.

	* Rebased to ZFS b117 from OpenSolaris:
	* module/zfs/dmu.c: Update zerocopy patch to be consistent with
	new flags arg passed to dmu_read().
	* module/zpios/zpios.c: Update zpios to be aware of the new flags
	argument available in dmu_read().  Additionally add a zpios command
	line flag to set the DMU_READ_NO_PREFETCH flag for a test.
	* module/zfs/include/sys/zfs_context.h: Wrap new sysevent includes
	until sysevent or something like it is implemented.
	* module/zfs/zfs_ioctl.c: Wrap all the ACL interfaces with HAVE_ZPL.
	They are integrated with the vfs layer which is not yet supported.
	* module/zcommon/zfs_prop.c: Export new quota related symbols.
	* lib/libzfs/libzfs_util.c: Increase buffer size for nvlist which
	is needed for large configurations.

	* Bug fixes:
	* lib/libspl/include/sys/zfs_debug.h: Removed duplicate file.
	* lib/libspl/include/sys/isa_defs.h: Fixed missing macro definitions
	for little endian and big endian.
	* cmd/zpios/zpios_main.c: Pretty-up the zpios 'make check' output.
	* module/zfs/vdev_disk.c: Honor spa_mode() when opening block devs.
	* module/zfs/vdev_disk.c: Initial error handling added to
	vdev_disk_io_done() to revalidate the media on EIO.
	* lib/libzfs/libzfs_util.c: Fix an accidentally introduced formatting
	issue in zfs_nicenum() output.
	
2009-07-02 Brian Behlendorf <behlendorf1@llnl.gov>

	* : Tag zfs-0.4.4 - Use 'git log --no-merges' for full change log.

	* : Generic distro friendly build system / packaging improvements
	for RPM based distros including CHAOS, RHEL, Fedora, and SLES.

	These changes bring the zfs-0.4.4 tree in to compliance with
	the spl-0.4.4 packaging changes.  The bottom line is 2 source
	rpms and 4 binary rpms will now be generated when creating
	packages there will be:

	zfs-<version>.src.rpm
	- Fully rebuildable source rpm for libzfs and utils.
	zfs-modules-<version>.src.rpm
	- Fully rebuildable source rpm for kernel modules.

	zfs-<version>.<arch>.rpm
	- Binary rpm for libzfs and utils.  The utils in this package are
	  compatible with all zfs-module rpms of the same version.
	zfs-devel-<version>.<arch>.rpm
	- Binary rpm containing headers for building against libzfs libraries.

	zfs-modules-<verion>-<kernel>.arch.rpm
	- Binary rpm containing the kernel modules for a specific kernel build.
	  The package name contains the kernel version and you should have one
	  of these packages installed to match every kernel on your system.
	zfs-modules-devel-<verion>-<kernel>.arch.rpm
	- Binary rpm containing development header and module symbols needed
	  for building additional kernel modules which are dependent on the
	  zfs module stack.

	* : SLES9/10 distro support added: Several significant updates to
	the build system were required to support this including:

	- Autoconf macros updated to be aware of the standard install
	locations for SLES kernel sources and build objects.  Additionally
	changes were made to support multiple names for Module{s}.symvers.
	- By default on SLES all user space builds are 32-bit even on
	64-bit arches.  This means we need to be careful to pass -m64 in
	the autoconf checks which probe the kernel.  Additionally, 
	ioctl_compat handles still need to be added so 32-bit user
	binarys can perform ioctls with the 64-bit kernel.

	* : Powerpc64 support added:

	- 64-bit user space atomic support for power64 was obtained from
	an old version of OpenSolaris which offered minimal powerpc support.
	The atomic support is not 100% fully implemented but it's a good
	first step towards cleanly supporting the architecture.
	- Added powerpc ISA type.
	- Explicitly use signed char for portability.  On x86/x86_64
	systems the default char type is signed, on ppc/ppc64 systems
	the default char type is unsigned.
	- Core target arch support for conditional compilation of SUBDIRs.
	Required by libspl for its arch specific atomic implementations.

	* COPYRIGHT: Readded accidentally dropped COPYRIGHT, it just
	references the OPENSOLARIS.LICENSE which was still in the project.

	* module/zfs/dmu_tx.c: Add EXPORT_SYMBOL(dmu_tx_callback_register).

	* config/user-zlib.m4: Add basic zlib autoconf check for user space.

2009-03-20 Brian Behlendorf <behlendorf1@llnl.gov>

	* : Tag zfs-0.4.3 - Use 'git log --no-merges' for full change log.

	* : Rebased to ZFS b108 from OpenSolaris

	* configure.ac, *Makefile.am: Build system update.  This includes
	resolving various build issues and adding support for the remaining
	common build targets.  Available targets now include:

	- make all        # Build everything
	- make install    # Install everything
	- make clean      # Clean up build products
	- make distclean  # Clean up everything
	- make dist       # Create package tarball
	- make srpm       # Create package source RPM
	- make rpm        # Create package binary RPMs
	- make tags       # Create ctags and etags for everything

	Extra care was taken to ensure that the source RPMs are fully
	rebuildable against Fedora/RHEL/Chaos kernels.  To build binary
	RPMs from the source RPM for your system simply run:

	rpmbuild --rebuild zfs-x.y.z-1.src.rpm

	This will produce two binary RPMs with correct 'requires'
	dependencies for your kernel.  One will contain all zfs modules
	and support utilities, the other is a devel package for compiling
	additional kernel modules which are dependent on the zfs.

	zfs-x.y.z-1_<kernel version>.x86_64.rpm
	zfs-devel-x.y.2-1_<kernel version>.x86_64.rpm

	* config/kernel.m4, config/Rules.am: Removed the build options
	-Wno-unused -Wno-missing -Wno-unused -Wno-parentheses and
	-Wno-unknown-pragmas.  All upstream warnings which were being
	suppressed by these options are now handled in the matching
	gcc-* topic branch.

	* zpios: Various zpios and test infrastructure improvements.

	* feature-commit-cb: New feature commit callbacks.

	* : Various bug fixes which are more clearly detailed in the
	git commit logs.  For a detailed summary of changes post version
	0.4.2, check out the 'top' topic branch and view the commit logs.

	git checkout top
	git log --no-merges -53

2009-02-05 Brian Behlendorf <behlendorf1@llnl.gov>

	* : Tag zfs-0.4.2

	* lib/libzfs/libzfs_util.c: Remove mknod() this is now handled by
	by the SPL with an upcall even without GPL-only symbols.

	* module/zfs/vdev_diskc: Updated linux vdev_disk interfaces to issue
	multiple bios if needed due to the maximum request size being smaller
	than the request size passed down from the spa.

	* scripts/zpool-config/lo-*: Add loopback based test configs.

2009-01-21 Brian Behlendorf <behlendorf1@llnl.gov>

	* : Tag zfs-0.4.1

	* : Rebased to ZFS b105 from OpenSolaris

	* : Restructured project and build system to more closely
	mirror the code organization used in OpenSolaris.  This
	allows us minimize the changes to upstream source needed,
	and allows concurrent user+kernel space builds of all components.

2008-11-19 Brian Behlendorf <behlendorf1@llnl.gov>

	* : Tag zfs-0.4.0

	* : ZFS project migrated from Subversion which leveraged a 
	quilt based patch stack to Git and a TopGit managed patch
	stack.  The new method treats all patches as Git branches
	which can be more easily shared for distributed development.
	Consult the top level GIT file for detailed information on
	how to properly develop for this package using Git+TopGit.

2008-11-12 Brian Behlendorf <behlendorf1@llnl.gov>

	* : Tag zfs-0.3.4

	* zfs-07-create-dev-zfs.patch:
	Ricardo M. Correia <Ricardo.M.Correia@sun.com>
	- Make libzfs create /dev/zfs if it doesn't exist.

	* zfs-05-check-zvol-size.patch:
	Ricardo M. Correia <Ricardo.M.Correia@sun.com>
	- Properly check zvol size under Linux.

	* zfs-04-no-openat-fdopendir.patch:
	Ricardo M. Correia <Ricardo.M.Correia@sun.com>
	- Do not use openat() and fdopendir() since they are not available
	  on older systems.

	* zfs-03-fix-bio-sync.patch:
	Ricardo M. Correia <Ricardo.M.Correia@sun.com>
	- Fix memory corruption in RHEL4 due to synchronous IO becoming
	  asynchronous.

2008-11-06 Brian Behlendorf <behlendorf1@llnl.gov>

	* zfs-02-zpios-fix-stuck-thread-memleak.patch:
	Ricardo M. Correia <Ricardo.M.Correia@sun.com>
	- Fix stuck threads and memory leaks when errors occur while writing.

	* zfs-01-zpios-arg-corruption.patch:
	Ricardo M. Correia <Ricardo.M.Correia@sun.com>
	- Fix zpios cmd line argument corruption problem.

	* zfs-00-minor-fixes.patch: 
	Ricardo M. Correia <Ricardo.M.Correia@sun.com>
	- Minor build system improvements
	- Minor script improvements
	- Create a full copy and not a link tree with quilt
	- ZPIOS_MAJOR changed from 231 to 232
	- BIO_RW_BARRIER flag removed from IO request

2008-06-30 Brian Behlendorf <behlendorf1@llnl.gov>

	* : Tag zfs-0.3.3

	* : Minor script updates and tweaks to be compatible with
	the latest version of the SPL.

2008-06-13 Brian Behlendorf <behlendorf1@llnl.gov>

	* vdev_disk.diff: Replace vdev_disk implementation which was
	based on the kmalloc'ed logical address space with a version
	which works with vmalloc'ed memory in the virtual address space.
	This was done to support the new SPL slab implementation which
	is based on virtual addresses to avoid the need for contigeously
	allocated memory.

2008-06-05 Brian Behlendorf <behlendorf1@llnl.gov>

	* arc-vm-integration.diff: Reduce maximum default arc memory 
	usage to 1/4 of total system memory.  Because all the bulk data
	is still allocated on the slab memory fragmentation is a serious
	concern.  To address this in the short term we simply need to
	leave lots of free memory.

	* fix-stack.diff: First step towards reducing stack usage so
	we can run the full ZFS stack using a stock kernel.

2008-06-04 Brian Behlendorf <behlendorf1@llnl.gov>

	* : Tag zfs-0.3.2

	* : Extensive improvements to the build system to detect kernel
	API changes so we can flexibly build with a wider range of kernel
	versions.  The code has now been testing with the 2.6.18-32chaos
	and 2.6.25.3-18.fc9 kernels, however we should also be compatible
	with other kernels in the range of 2.6.18-2.6.25.  The only
	remaining issue preventing us from running with a stock 
	kernel is ZFS stack usage.

2008-05-21 Brian Behlendorf <behlendorf1@llnl.gov>

	* : Tag zfs-0.3.1

	* : License headers including URCL added for release.

2008-05-21 Brian Behlendorf <behlendorf1@llnl.gov>

	* : Tag zfs-0.3.0

	* configure.ac: Improved autotools support and configurable debug.

2008-05-15 Brian Behlendorf <behlendorf1@llnl.gov>

	* : Updating original ZFS sources to build 89 which
	includes the new write throttling changes plus support
	for using ZFS as your root device.  Neither of which
	will work exactly right without some more work but this
	gets us much closers to the latest source.
	

2008-02-28 Brian Behlendorf <behlendorf1@llnl.gov>

	* : First attempt based on SPL module and zfs-lustre sources