In the past birth was always zero for holes. This feature started
to make use of birth for holes as well, so change code to test for
valid DVA address instead.

	Just "packed" doesn't always pack the way we expect.

It was accidently committed to wrong branch

This reverts commit 0ee5cdfe.

	shadowing.
	* grub-core/kern/disk.c: Likewise.
	* grub-core/kern/misc.c: Likewise.
	* include/grub/parser.h: Likewise.
	* include/grub/script_sh.h: Likewise.
	* include/grub/zfs/zfs.h: Likewise.

	* grub-core/fs/zfs/zfs.c (zio_read): Don't use casts to retrieve mac.

	* grub-core/fs/zfs/zfs.c: Tie up lz4 decompression.

	(check_pool_label): Likewise.
	* include/grub/zfs/zfs.h: Rewrite SPA_VERSION_* macros.

	anymore.

	* grub-core/fs/ext2.c (EXT2_PATH_MAX): Removed.
	(EXT2_MAX_SYMLINKCNT): Likewise.
	* grub-core/fs/nilfs2.c (NILFS_BTREE_LEVEL_MAX): Likewise.
	* grub-core/net/tftp.c (TFTP_MAX_PACKET): Likewise.
	* include/grub/i386/pc/pxe.h (GRUB_PXE_MIN_BLKSIZE): Likewise.
	(GRUB_PXE_MAX_BLKSIZE): Likewise.
	* include/grub/normal.h (GRUB_MAX_CMDLINE): Likewise.
	* include/grub/zfs/dnode.h (DN_MAX_INDBLKSHIFT): Likewise.
	(DN_MAX_OBJECT_SHIFT): Likewise.
	(DN_MAX_OFFSET_SHIFT): Likewise.
	(DN_MAX_OBJECT): Likewise.
	(DNODES_PER_LEVEL_SHIFT): Likewise.
	* include/grub/zfs/spa.h (SPA_MAXBLOCKSHIFT): Likewise.
	(SPA_MAXBLOCKSIZE): Likewise.
	(SPA_BLOCKSIZES): Likewise.
	* include/grub/zfs/zap_impl.h (MZAP_MAX_BLKSHIFT): Likewise.
	(MZAP_MAX_BLKSZ): Likewise.

	function.
	(ZAP_HASH_IDX): Likewise.
	(ZAP_LEAF_HASH_SHIFT): Likewise.
	(ZAP_LEAF_HASH_NUMENTRIES): Likewise.
	(LEAF_HASH): Likewise.
	(ZAP_LEAF_NUMCHUNKS): Likewise.
	(ZAP_LEAF_CHUNK): Likewise. Changed pointer arithmetic to preserve
	alignment invariants. Return pointer. All users updated.
	(ZAP_LEAF_ENTRY): Make into inline function.
	(NBBY): Removed.
	(xor): LIkewise.
	(xor_out): Use grub_crypto_xor.
	(dnode_get_path): Use grub_get_unaligned.
	(nvlist_find_value): Likewise.
	(grub_zfs_nvlist_lookup_uint64): Likewise.
	(grub_zfs_nvlist_lookup_string): Likewise.
	(get_nvlist_size): Likewise.
	(grub_zfs_open): Likewise.
	(fill_fs_info): Likewise.
	(grub_zfs_dir): Likewise.
	* include/grub/zfs/zap_leaf.h (zap_leaf_phys): Adapt to preserve
	alignment invariants.
	* include/grub/zfs/zio.h (zio_eck_t): Mark as packed as it's not
	necessarily aligned.

	* grub-core/commands/i386/pc/sendkey.c (keysym): Add missing const.
	* grub-core/commands/lspci.c (grub_pci_classname): Likewise.
	* grub-core/commands/menuentry.c (hotkey_aliases): Likewise.
	* grub-core/disk/lvm.c (grub_lvm_getvalue): Likewise.
	(grub_lvm_check_flag): Likewise.
	* grub-core/efiemu/i386/coredetect.c
	(grub_efiemu_get_default_core_name): Likewise
	* grub-core/efiemu/main.c (grub_efiemu_autocore): Likewise.
	* grub-core/fs/hfsplus.c (grub_hfsplus_catkey_internal): Likewise.
	* grub-core/fs/ntfs.c (fixup): Likewise.
	* grub-core/fs/xfs.c (grub_xfs_iterate_dir): Likewise.
	* grub-core/fs/zfs/zfs.c (decomp_entry): Likewise.
	(fzap_lookup): Likewise.
	(zap_lookup): Likewise.
	* grub-core/gnulib/regcomp.c (init_dfa): Likewise.
	* grub-core/lib/legacy_parse.c (check_option): Likewise.
	* grub-core/lib/posix_wrap/langinfo.h (nl_langinfo): Likewise.
	* grub-core/loader/i386/bsd.c (grub_bsd_add_meta): Likewise.
	(grub_freebsd_add_meta_module): Likewise.
	(grub_cmd_freebsd_module): Likewise.
	* grub-core/loader/i386/xnu.c (tbl_alias): Likewise.
	* grub-core/loader/xnu.c (grub_xnu_register_memory): Likewise.
	(grub_xnu_writetree_get_size): Likewise.
	(grub_xnu_writetree_toheap_real): Likewise.
	(grub_xnu_find_key): Likewise.
	(grub_xnu_create_key): Likewise.
	(grub_xnu_create_value): Likewise.
	(grub_xnu_register_memory): Likewise.
	(grub_xnu_check_os_bundle_required): Likewise.
	(grub_xnu_scan_dir_for_kexts): Likewise.
	(grub_xnu_load_kext_from_dir): Likewise.
	* grub-core/normal/color.c (color_list): Likewise.
	* grub-core/normal/completion.c (current_word): Likewise.
	* grub-core/normal/menu_entry.c (insert_string): Likewise.
	* grub-core/term/serial.c (grub_serial_find): Likewise.
	* grub-core/term/tparm.c (grub_terminfo_tparm): Likewise.
	* include/grub/efiemu/efiemu.h (grub_efiemu_get_default_core_name):
	Likewise.
	* include/grub/i386/bsd.h (grub_bsd_add_meta): Likewise.
	(grub_freebsd_add_meta_module): Likewise.
	* include/grub/lib/arg.h (grub_arg_option): Likewise.
	* include/grub/net.h (grub_net_card_driver): Likewise.
	(grub_net_card): Likewise.
	(grub_net_app_protocol): Likewise.
	* include/grub/parttool.h (grub_parttool_argdesc): Likewise.
	* include/grub/serial.h (grub_serial_find): Likewise.
	* include/grub/tparm.h (grub_terminfo_tparm): Likewise.
	* include/grub/xnu.h (grub_xnu_create_key): Likewise.
	(grub_xnu_create_value): Likewise.
	(grub_xnu_find_key): Likewise.
	(grub_xnu_scan_dir_for_kexts): Likewise.
	(grub_xnu_load_kext_from_dir): Likewise.

	* include/grub/zfs/zio_checksum.h (zio_checksum_t): Moved from here ...
	* grub-core/fs/zfs/zfs.c (zio_checksum_t): ...here.
	* include/grub/zfs/zio_checksum.h (zio_checksum_info):
	Moved from here ...
	* grub-core/fs/zfs/zfs.c (zio_checksum_info): ... here. Added missing const.

	* grub-core/fs/zfs/zfs.c (zle_decompress): New function.
	(decomp_table): Add zle.
	* include/grub/zfs/zio.h (zio_compress): Add zle.

        * include/grub/zfs/zap_leaf.h (typedef union zap_leaf_chunk): Mark
        la_array as packed.
        Reported by: Zachary Bedell

	* grub-core/fs/zfs/zfs.c (zlib_decompress): New function.
	(decomp_table): Add zlib entries.
	(zio_read): USe 8 bits for compression function rather than 3.
	* include/grub/zfs/zio.h (zio_compress): Add zlib values.

Update GPL for ZFS code to version 3, move copyright lines for Vladimir and me to FSF (covered by our assignments)

	
	* grub-core/fs/zfs/zfs.c: New file.
	* grub-core/fs/zfs/zfs_fletcher.c: Likewise.
	* grub-core/fs/zfs/zfs_lzjb.c: Likewise.
	* grub-core/fs/zfs/zfs_sha256.c: Likewise.
	* grub-core/fs/zfs/zfsinfo.c: Likewise.
	
	* include/grub/zfs/dmu.h: Likewise.
	* include/grub/zfs/dmu_objset.h: Likewise.
	* include/grub/zfs/dnode.h: Likewise.
	* include/grub/zfs/dsl_dataset.h: Likewise.
	* include/grub/zfs/dsl_dir.h: Likewise.
	* include/grub/zfs/sa_impl.h: Likewise.
	* include/grub/zfs/spa.h: Likewise.
	* include/grub/zfs/uberblock_impl.h: Likewise.
	* include/grub/zfs/vdev_impl.h: Likewise.
	* include/grub/zfs/zap_impl.h: Likewise.
	* include/grub/zfs/zap_leaf.h: Likewise.
	* include/grub/zfs/zfs.h: Likewise.
	* include/grub/zfs/zfs_acl.h: Likewise.
	* include/grub/zfs/zfs_znode.h: Likewise.
	* include/grub/zfs/zil.h: Likewise.
	* include/grub/zfs/zio.h: Likewise.
	* include/grub/zfs/zio_checksum.h: Likewise.
	
	* Makefile.util.def: Build ZFS into libgrubmods.
	* grub-core/Makefile.core.def: Build zfs.mod.