Re: [PATCH] btrfs: write-protect folios during data writeback

在 2026/7/9 18:16, Qu Wenruo 写道:
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[...]
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> With all these said, this may help you to craft a more reliable 
> reproducer, by:
> 
> 1. Allocate a large folio (e.g, 64KiB on 4K ps systems)
>     By doing a 64KiB sized buffered write at file offset 0.

My bad, missing a sync here.
Other wise the later mmaped write will not cause two different dirty ranges.

> 
> 2. Mmap range [4K, 8K) and [16K, 20K)
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> 3. Trigger writeback with mmaped range being modified
>