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99c452bbba
The existing taskq_wait_id() function can incorrectly block indefinitely. Reimplement it more simply using wait_event() in a similar fashion to taskq_wait_all(). This flaw was uncovered in the context of moving vn_rdwr() to a taskq. Previously taskq_wait_id() had no consumers outside the SPLAT task framework which is why the issue went unnoticed. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>