Re: Regression in generic/749 with 8k fsblock size on 6.18-rc1

Matthew Wilcox
2025-10-17T17:14:38Z

On Fri, Oct 17, 2025 at 03:28:32PM +0100, Kiryl Shutsemau wrote:
> If we solved problem of zeroing upto PAGE_SIZE border, I don't see
> why zeroing upto folio_size() border any conceptually different.
> Might require some bug squeezing, sure.

I'm travelling right now and don't want to dig my way through the POSIX
spec to lawyer about this. Last time I looked at this problem, I came
away convinced that it was a POSIX requirement that page faults beyond
the page which contains EOF must signal.

Even if not, it's a QoI issue and we've invested significant effort
keeping this guarantee. Please just fix the bug.