1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index 479c1da3e221..b8ec145b2975 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -98,6 +98,24 @@ iomap_sector(struct iomap *iomap, loff_t pos)
 }
 
 /*
+ * Returns the inline data pointer for logical offset @pos.
+ */
+static inline void *iomap_inline_data(struct iomap *iomap, loff_t pos)
+{
+	return iomap->inline_data + pos - iomap->offset;
+}
+
+/*
+ * Check if the mapping's length is within the valid range for inline data.
+ * This is used to guard against accessing data beyond the page inline_data
+ * points at.
+ */
+static inline bool iomap_inline_data_valid(struct iomap *iomap)
+{
+	return iomap->length <= PAGE_SIZE - offset_in_page(iomap->inline_data);
+}
+
+/*
  * When a filesystem sets page_ops in an iomap mapping it returns, page_prepare
  * and page_done will be called for each page written to.  This only applies to
  * buffered writes as unbuffered writes will not typically have pages