Merge branch 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

[linux-2.6-block.git] / lib / iov_iter.c

diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 015061e49236a1ea1a63d004528868c34682f1bf..28cb4315fe57374119559fc186f72373b8457535 100644 (file)
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -549,6 +549,25 @@ unsigned long iov_iter_alignment(const struct iov_iter *i)
 }
 EXPORT_SYMBOL(iov_iter_alignment);
 
+unsigned long iov_iter_gap_alignment(const struct iov_iter *i)
+{
+        unsigned long res = 0;
+       size_t size = i->count;
+       if (!size)
+               return 0;
+
+       iterate_all_kinds(i, size, v,
+               (res |= (!res ? 0 : (unsigned long)v.iov_base) |
+                       (size != v.iov_len ? size : 0), 0),
+               (res |= (!res ? 0 : (unsigned long)v.bv_offset) |
+                       (size != v.bv_len ? size : 0)),
+               (res |= (!res ? 0 : (unsigned long)v.iov_base) |
+                       (size != v.iov_len ? size : 0))
+               );
+               return res;
+}
+EXPORT_SYMBOL(iov_iter_gap_alignment);
+
 ssize_t iov_iter_get_pages(struct iov_iter *i,
                   struct page **pages, size_t maxsize, unsigned maxpages,
                   size_t *start)