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Fix generation of non-standard "scan" in object directory. #2097

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Fix generation of non-standard "scan" in object directory. #2097

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Commits on Feb 3, 2014

  1. Fix generation of non-standard "scan" and "bptree_obj" in object dire… 

    …ctory.

Commit 1421c89 expanded the size of a zbookmark_t from 24 to 25 64-bit
values which similarly expands the size of the "scan" entry in the pool's
object directory and causes the pool to become un-importable by other
OpenZFS implementations.

This commit renames "struct zbookmark" to "struct zbookmark_phys" since
it is related to an on-disk format and adds a new "struct zbookmark" that
contains the former as its first member.  The effect is that the "struct
zbookmark" items written to the object directory in both the "scan" and
"bptree_obj" entries contain only the correct subset of the bookmark.

Fixes openzfs#2094
    @dweeezil
    dweeezil committed Feb 3, 2014
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  2. Allow import of pools with corrupted "scan" entries in the object dir… 

    …ectory.

Add a comptibility shim to dsl_scan_init() to support importing broken
pools that have the larger-than-normal "scan" entry.
    @dweeezil
    dweeezil committed Feb 3, 2014
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