JFS: Take logsync lock before testing mp->lsn
This fixes a race where lsn could be cleared before taking the lock
Signed-off-by: NDave Kleikamp <shaggy@austin.ibm.com>
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This fixes a race where lsn could be cleared before taking the lock
Signed-off-by: NDave Kleikamp <shaggy@austin.ibm.com>