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neon/pageserver
Arpad Müller 128a85ba5e Convert many VirtualFile APIs to async (#5190)
## Problem

`VirtualFile` does both reading and writing, and it would be nice if
both could be converted to async, so that it doesn't have to support an
async read path and a blocking write path (especially for the locks this
is annoying as none of the lock implementations in std, tokio or
parking_lot have support for both async and blocking access).

## Summary of changes

This PR is some initial work on making the `VirtualFile` APIs async. It
can be reviewed commit-by-commit.

* Introduce the `MaybeVirtualFile` enum to be generic in a test that
compares real files with virtual files.
* Make various APIs of `VirtualFile` async, including `write_all_at`,
`read_at`, `read_exact_at`.

Part of #4743 , successor of #5180.

Co-authored-by: Christian Schwarz <me@cschwarz.com>
2023-09-04 17:05:20 +02:00
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