The patch titled
Subject: mm-fail-get_vaddr_frames-for-filesystem-dax-mappings-v3
has been added to the -mm tree. Its filename is
mm-fail-get_vaddr_frames-for-filesystem-dax-mappings-v3.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-fail-get_vaddr_frames-for-filesystem-dax-mappings-v3.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-fail-get_vaddr_frames-for-filesystem-dax-mappings-v3.patch
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------------------------------------------------------
From: Dan Williams <dan.j.williams@xxxxxxxxx>
Subject: mm-fail-get_vaddr_frames-for-filesystem-dax-mappings-v3
add comment for vma_is_fsdax() check in get_vaddr_frames(), per Jan
Link: http://lkml.kernel.org/r/151197874035.26211.4061781453123083667.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/frame_vector.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff -puN mm/frame_vector.c~mm-fail-get_vaddr_frames-for-filesystem-dax-mappings-v3 mm/frame_vector.c
--- a/mm/frame_vector.c~mm-fail-get_vaddr_frames-for-filesystem-dax-mappings-v3
+++ a/mm/frame_vector.c
@@ -54,6 +54,14 @@ int get_vaddr_frames(unsigned long start
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;
_
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
mm-fail-get_vaddr_frames-for-filesystem-dax-mappings-v3.patch
v4l2-disable-filesystem-dax-mapping-support.patch
ib-core-disable-memory-registration-of-fileystem-dax-vmas.patch
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