Jan Kara writes:
> On Thu 27-06-24 10:54:21, Alistair Popple wrote:
>> Currently to map a DAX page the DAX driver calls vmf_insert_pfn. This
>> creates a special devmap PTE entry for the pfn but does not take a
>> reference on the underlying struct page for the mapping. This is
>> because DAX p
On 02.07.24 13:46, Christoph Hellwig wrote:
On Tue, Jul 02, 2024 at 09:18:31AM +0200, David Hildenbrand wrote:
We have this comparably nasty vmf_insert_mixed() that FS dax abused to
insert into !VM_MIXED VMAs. Is that abuse now stopping and are there maybe
ways to get rid of vmf_insert_mixed()?
On Tue, Jul 02, 2024 at 09:18:31AM +0200, David Hildenbrand wrote:
> We have this comparably nasty vmf_insert_mixed() that FS dax abused to
> insert into !VM_MIXED VMAs. Is that abuse now stopping and are there maybe
> ways to get rid of vmf_insert_mixed()?
Unfortunately it is also used by a few
David Hildenbrand writes:
> On 27.06.24 02:54, Alistair Popple wrote:
>> Currently to map a DAX page the DAX driver calls vmf_insert_pfn. This
>> creates a special devmap PTE entry for the pfn but does not take a
>> reference on the underlying struct page for the mapping. This is
>> because DAX
On 27.06.24 02:54, Alistair Popple wrote:
Currently to map a DAX page the DAX driver calls vmf_insert_pfn. This
creates a special devmap PTE entry for the pfn but does not take a
reference on the underlying struct page for the mapping. This is
because DAX page refcounts are treated specially, as
On Thu 27-06-24 10:54:21, Alistair Popple wrote:
> Currently to map a DAX page the DAX driver calls vmf_insert_pfn. This
> creates a special devmap PTE entry for the pfn but does not take a
> reference on the underlying struct page for the mapping. This is
> because DAX page refcounts are treated s
On Thu, Jun 27, 2024 at 10:54:21AM +1000, Alistair Popple wrote:
> +extern void prep_compound_page(struct page *page, unsigned int order);
No need for the extern.
> static int insert_page_into_pte_locked(struct vm_area_struct *vma, pte_t
> *pte,
> - unsigned long addr, struc
Currently to map a DAX page the DAX driver calls vmf_insert_pfn. This
creates a special devmap PTE entry for the pfn but does not take a
reference on the underlying struct page for the mapping. This is
because DAX page refcounts are treated specially, as indicated by the
presence of a devmap entry.
