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-rw-r--r--include/linux/bvec.h13
1 files changed, 11 insertions, 2 deletions
diff --git a/include/linux/bvec.h b/include/linux/bvec.h
index a81c13ac1972..ac0c7299d5b8 100644
--- a/include/linux/bvec.h
+++ b/include/linux/bvec.h
@@ -12,8 +12,17 @@
#include <linux/errno.h>
#include <linux/mm.h>
-/*
- * was unsigned short, but we might as well be ready for > 64kB I/O pages
+/**
+ * struct bio_vec - a contiguous range of physical memory addresses
+ * @bv_page: First page associated with the address range.
+ * @bv_len: Number of bytes in the address range.
+ * @bv_offset: Start of the address range relative to the start of @bv_page.
+ *
+ * The following holds for a bvec if n * PAGE_SIZE < bv_offset + bv_len:
+ *
+ * nth_page(@bv_page, n) == @bv_page + n
+ *
+ * This holds because page_is_mergeable() checks the above property.
*/
struct bio_vec {
struct page *bv_page;