The patch titled
Subject: mm: fail get_vaddr_frames() for filesystem-dax mappings
has been added to the -mm tree. Its filename is
mm-fail-get_vaddr_frames-for-filesystem-dax-mappings.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-fail-get_vaddr_frames-for-filesystem-dax-mappings.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-fail-get_vaddr_frames-for-filesystem-dax-mappings.patch
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From: Dan Williams <dan.j.williams@xxxxxxxxx>
Subject: mm: fail get_vaddr_frames() for filesystem-dax mappings
Until there is a solution to the dma-to-dax vs truncate problem it is not
safe to allow V4L2, Exynos, and other frame vector users to create long
standing / irrevocable memory registrations against filesytem-dax vmas.
Link: http://lkml.kernel.org/r/151068939985.7446.15684639617389154187.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 3565fce3a659 ("mm, x86: get_user_pages() for dax mappings")
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Inki Dae <inki.dae@xxxxxxxxxxx>
Cc: Seung-Woo Kim <sw0312.kim@xxxxxxxxxxx>
Cc: Joonyoung Shim <jy0922.shim@xxxxxxxxxxx>
Cc: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Doug Ledford <dledford@xxxxxxxxxx>
Cc: Hal Rosenstock <hal.rosenstock@xxxxxxxxx>
Cc: Jason Gunthorpe <jgunthorpe@xxxxxxxxxxxxxxxxxxxx>
Cc: Jeff Moyer <jmoyer@xxxxxxxxxx>
Cc: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Cc: Sean Hefty <sean.hefty@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/frame_vector.c | 4 ++++
1 file changed, 4 insertions(+)
diff -puN mm/frame_vector.c~mm-fail-get_vaddr_frames-for-filesystem-dax-mappings mm/frame_vector.c
--- a/mm/frame_vector.c~mm-fail-get_vaddr_frames-for-filesystem-dax-mappings
+++ a/mm/frame_vector.c
@@ -53,6 +53,10 @@ int get_vaddr_frames(unsigned long start
ret = -EFAULT;
goto out;
}
+
+ if (vma_is_fsdax(vma))
+ return -EOPNOTSUPP;
+
if (!(vma->vm_flags & (VM_IO | VM_PFNMAP))) {
vec->got_ref = true;
vec->is_pfns = false;
_
Patches currently in -mm which might be from dan.j.williams@xxxxxxxxx are
mm-fix-device-dax-pud-write-faults-triggered-by-get_user_pages.patch
mm-fix-device-dax-pud-write-faults-triggered-by-get_user_pages-v3.patch
mm-switch-to-define-pmd_write-instead-of-__have_arch_pmd_write.patch
mm-replace-pud_write-with-pud_access_permitted-in-fault-gup-paths.patch
mm-replace-pud_write-with-pud_access_permitted-in-fault-gup-paths-v3.patch
mm-replace-pmd_write-with-pmd_access_permitted-in-fault-gup-paths.patch
mm-replace-pte_write-with-pte_access_permitted-in-fault-gup-paths.patch
mm-hugetlbfs-introduce-split-to-vm_operations_struct.patch
device-dax-implement-split-to-catch-invalid-munmap-attempts.patch
mm-introduce-get_user_pages_longterm.patch
mm-fail-get_vaddr_frames-for-filesystem-dax-mappings.patch
v4l2-disable-filesystem-dax-mapping-support.patch
ib-core-disable-memory-registration-of-fileystem-dax-vmas.patch