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-rw-r--r--fs/dax.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/dax.c b/fs/dax.c
index 306c2b603fb8..865d42c63e23 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -1383,6 +1383,16 @@ static int dax_iomap_pmd_fault(struct vm_fault *vmf,
trace_dax_pmd_fault(inode, vmf, max_pgoff, 0);
+ /*
+ * Make sure that the faulting address's PMD offset (color) matches
+ * the PMD offset from the start of the file. This is necessary so
+ * that a PMD range in the page table overlaps exactly with a PMD
+ * range in the radix tree.
+ */
+ if ((vmf->pgoff & PG_PMD_COLOUR) !=
+ ((vmf->address >> PAGE_SHIFT) & PG_PMD_COLOUR))
+ goto fallback;
+
/* Fall back to PTEs if we're going to COW */
if (write && !(vma->vm_flags & VM_SHARED))
goto fallback;