Re: [PATCH v3] f2fs: do not support mmap write for large folio

Christoph Hellwig
2026-04-09T05:40:31Z

[adding back fsdevel and mm to the discussion]

On Wed, Apr 08, 2026 at 06:13:06PM +0000, Jaegeuk Kim wrote:
> Let's check mmap writes onto the large folio, since we don't support writing
> large folios.

What does this fix? As state in the previous round of discussion f2fs
only support large folios for immutable files, how do you get ->mkwrite
called for them.

The only way I can think of that is when clearing the immutable flag,
but simply rejecting writes with SIGBUS after that seems like it's
breaking the expected API, and I don't see handling for normal writes
after that either.