On 2/9/21 8:19 AM, Christoph Hellwig wrote: > On Mon, Feb 08, 2021 at 07:26:25PM -0400, Jason Gunthorpe wrote: >>>> page_mkclean() has some technique to make the notifier have the right >>>> size without becoming entangled in the PTL locks.. >>> >>> Right. I guess it's because dax doesn't have "struct page*" on the >>> back, so it >> >> It doesn't? I thought DAX cases did? > > File system DAX has a struct page, device DAX does not. Which means > everything using iomap should have a page available, but i'm adding > Dan as he should know the details :) > Both fsdax and device-dax have struct page. It's the pmem block device that doesn't.
