sched: add bit_wait_io for 3.18 ext4 backport
Excerpted from commit 743162013: "sched: Remove proliferation of wait_on_bit() action functions" Change-Id: I56153d55a9af9f2911ed6ffb15d36ad89d45cd55 Signed-off-by:Theodore Ts'o <tytso@mit.edu> Signed-off-by:
Theodore Ts'o <tytso@google.com>
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