On Wed, Jan 31, 2024 at 05:20:10AM +0000, Matthew Wilcox wrote:
> I'd suggest that saving off current->journal_info is risky because
> it might cover a real problem where you've taken a pagefault inside
> a transaction (eg ext4 faulting while in the middle of a transaction on
> the same filesystem that contains the faulting file).
Agreed.
> Seems to me that we shouldn't be writing to userspace while in the
> middle of a transaction. We could even assert that in copy_to_user()?
That sounds useful, but also rather expensive.