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During pool export flush the ARC asynchronously #16215

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During pool export flush the ARC asynchronously #16215

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Commits on Oct 22, 2024

  1. During pool export flush the ARC asynchronously 

    This also includes removing L2 vdevs asynchronously

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.

Signed-off-by: Don Brady <don.brady@klarasystems.com>
    @don-brady
    don-brady committed Oct 22, 2024
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  2. Guarantee that spa_load_guid is unique 

    The zpool reguid feature introduced the spa_load_guid, which is a
transient value used for runtime identification purposes in the ARC.
This value is not the same as the spa's persistent pool guid.

However, the value is seeded from spa_generate_load_guid() which
does not check for uniqueness against the spa_load_guid from other
pools.  Although extremely rare, you can end up with two different
pools sharing the same spa_load_guid value!

This change guarantees that the value is always unique and
additionally not still in use by an async arc flush task.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.

Signed-off-by: Don Brady <don.brady@klarasystems.com>
    @don-brady
    don-brady committed Oct 22, 2024
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