1 files changed, 12 insertions, 0 deletions

diff --git a/mm/frame_vector.c b/mm/frame_vector.c
index 2f98df0d460e..297c7238f7d4 100644
--- a/mm/frame_vector.c
+++ b/mm/frame_vector.c
@@ -53,6 +53,18 @@ int get_vaddr_frames(unsigned long start, unsigned int nr_frames,
                 ret = -EFAULT;
                 goto out;
         }
+
+        /*
+         * While get_vaddr_frames() could be used for transient (kernel
+         * controlled lifetime) pinning of memory pages all current
+         * users establish long term (userspace controlled lifetime)
+         * page pinning. Treat get_vaddr_frames() like
+         * get_user_pages_longterm() and disallow it for filesystem-dax
+         * mappings.
+         */
+        if (vma_is_fsdax(vma))
+                return -EOPNOTSUPP;
+
         if (!(vma->vm_flags & (VM_IO | VM_PFNMAP))) {
                 vec->got_ref = true;
                 vec->is_pfns = false;