Zach Brown 757ee85520 scoutfs: don't lose block wakeups ...

The block end_io path could lose wakeups.  Both the bio submission
task and a bio's end_io completion could see an io_count > 1 and neither
would set the block uptodate before dropping their io_count and waking.

It got into this mess because readers were waiting for io_count to drop
to 0.  We add a io_busy bit which indicates that io is still in flight
which waiters now wait for.  This gives the final io_count drop a chance
to do work before clearing io_busy and dropping their reference before
waking.

Signed-off-by: Zach Brown <zab@versity.com>

2020-02-28 11:34:02 -08:00

kmod

scoutfs: don't lose block wakeups

2020-02-28 11:34:02 -08:00

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