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

On Thu, Jul 09, 2026 at 06:49:45PM +0930, Qu Wenruo wrote:
> 
> 
> 在 2026/7/9 18:16, Qu Wenruo 写道:
> > 
> [...]
> > 
> > 
> > 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.
> 

No worries, your notes already helped me a lot with improving the
reproducer scripts that I'm working on.

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