Since it is not a DAX-specific function, move it into mm and rename it
to be a generic helper.
Signed-off-by: Shiyang Ruan <ruansy.fnst@xxxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
---
fs/dax.c | 12 +-----------
include/linux/mm.h | 13 +++++++++++++
2 files changed, 14 insertions(+), 11 deletions(-)
diff --git a/fs/dax.c b/fs/dax.c
index 964512107c23..250794a5b789 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -834,16 +834,6 @@ static void *dax_insert_entry(struct xa_state *xas,
return entry;
}
-static inline
-unsigned long pgoff_address(pgoff_t pgoff, struct vm_area_struct *vma)
-{
- unsigned long address;
-
- address = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT);
- VM_BUG_ON_VMA(address < vma->vm_start || address >= vma->vm_end, vma);
- return address;
-}
-
/* Walk all mappings of a given index of a file and writeprotect them */
static void dax_entry_mkclean(struct address_space *mapping, pgoff_t index,
unsigned long pfn)
@@ -863,7 +853,7 @@ static void dax_entry_mkclean(struct address_space *mapping, pgoff_t index,
if (!(vma->vm_flags & VM_SHARED))
continue;
- address = pgoff_address(index, vma);
+ address = vma_pgoff_address(vma, index);
/*
* follow_invalidate_pte() will use the range to call
diff --git a/include/linux/mm.h b/include/linux/mm.h
index e1a84b1e6787..9b1d56c5c224 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2816,6 +2816,19 @@ static inline unsigned long vma_pages(struct vm_area_struct *vma)
return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
}
+/*
+ * Get user virtual address at the specific offset within a vma.
+ */
+static inline unsigned long vma_pgoff_address(struct vm_area_struct *vma,
+ pgoff_t pgoff)
+{
+ unsigned long address;
+
+ address = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT);
+ VM_BUG_ON_VMA(address < vma->vm_start || address >= vma->vm_end, vma);
+ return address;
+}
+
/* Look up the first VMA which exactly match the interval vm_start ... vm_end */
static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm,
unsigned long vm_start, unsigned long vm_end)
--
2.34.1
