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Add file truncate()

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还没有人认领这个 Issue。

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c
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embedded-iot

调研方向

Start by comparing this request with the linked upstream MicroPython issue #4775 and pull request #11500, which the issue says looks close to the expected change. Check whether that PR can be adopted or what would need to change for acceptance. Done means the requested file-truncation capability can be pursued with a clear path forward.

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描述

cpython api enhancement

We don't have .truncate() and extending FAT files can be slow (and blocking), so high-frequency loggers need to preallocate oversized files, then later truncate them. This currently requires copying upon completion (slow + requires extra free space). Basically the same request as this upstream one:
https://github.com/micropython/micropython/issues/4775

That one has a PR on it already, which looks pretty much how I'd expect: https://github.com/micropython/micropython/pull/11500

Can we just grab that PR (or evangelize for MP to accept it or specify what exactly needs to change to get it accepted)?

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