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Zach BrownandZach Brown
7cf8d01c1b
The conversion to reading the super with buffer_head IO caused racing readers to risk spurious errors. Clearing uptodate to force device access could race with a current waking reader. They could wake and find uptodate cleared and think that an IO error had occurred. The buffer_head functions generally require higher level serialization of this kind of use of the uptodate bit. We use bh_private as a counter to ensure that we don't clear uptodate while there are active readers. We then also use a private buffer_head bit to satisfy batches of waiting readers with each IO. Signed-off-by: Zach Brown <zab@versity.com>