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Under certain circumstances the following functions may be called in a context where KM_SLEEP is unsafe and can result in a deadlocked system. To avoid this problem the unconditional KM_SLEEPs are converted to KM_PUSHPAGEs. This will prevent them from attempting to initiate any I/O during direct reclaim. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>