Andreas Kling a7b70c62d7 Kernel: Fix broken disk cache behavior with O_DIRECT ...

When writing into a block via an O_DIRECT open file description, we
would first flush every dirty block *except* the one we're about to
write into.

The purpose of flushing is to ensure coherency when mixing direct and
indirect accesses to the same file. This patch fixes the issue by only
flushing the affected block.

Our behavior was totally backwards and could end up doing a lot of
unnecessary work while avoiding the work that actually mattered.

2022-01-08 20:15:25 +01:00

10 KiB

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