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APFS: FSTREE oids on sealed volume
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APFS: FSTREE oids on sealed volume


  • Subject: APFS: FSTREE oids on sealed volume
  • From: Joe Sylve via Filesystem-dev <email@hidden>
  • Date: Wed, 28 Oct 2020 15:07:20 -0500

I have a question regarding the on-disk structure of sealed system volumes
in macOS 11.  When parsing the sealed system volume, I'm seeing non-leaf
fstree nodes whose binv_child_oid does not correspond to an object id that
is found in the volume's OMAP.  Parsing the non-sealed volumes works as
expected.

I can't find anything in the latest documentation that suggests that the
child object ids in sealed volume fstrees should be handled any
differently, and the flags in the tree suggest that these are virtual
object ids.

Is there another layer of indirection or a different omap that I need to
parse to link the child nodes on sealed volumes?

--
Joe T. Sylve, Ph.D.
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