On 11/25/25 19:38, Mike Rapoport wrote:
From: "Mike Rapoport (Microsoft)" <[email protected]>
When userspace resolves a page fault in a shmem VMA with UFFDIO_CONTINUE
it needs to get a folio that already exists in the pagecache backing
that VMA.
Instead of using shmem_get_folio() for that, add a get_folio() method to
'struct vm_operations_struct' that will return a folio if it exists in
the VMA's pagecache at given pgoff.
Implement get_folio() method for shmem and slightly refactor
userfaultfd's mfill_atomic() and mfill_atomic_pte_continue() to support
this new API.
Signed-off-by: Mike Rapoport (Microsoft) <[email protected]>
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Acked-by: David Hildenbrand (Red Hat) <[email protected]>
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Cheers
David
