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MFC r342747 (mmacy): zfsboot: support newer ZFS versions

Description

MFC r342747 (mmacy): zfsboot: support newer ZFS versions

declare v3 objset size/layout to fix userboot and possibly other loader
issues

  • fix for userboot assertion failure in zfs_dev_close in free due to out of bounds write
  • fix for zfs_alloc / zfs_free mismatch assertion failure when booting GPT on BIOS

Approved by: re (gjb)

Details

Provenance
kevansAuthored on
Parents
rS348866: MFC r348569: [zfsboot] Fix boot env back compat (#190)
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