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-rw-r--r--mm/iov_iter.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/mm/iov_iter.c b/mm/iov_iter.c
index 827732047da1..9d96e283520c 100644
--- a/mm/iov_iter.c
+++ b/mm/iov_iter.c
@@ -751,3 +751,18 @@ int iov_iter_npages(const struct iov_iter *i, int maxpages)
return npages;
}
EXPORT_SYMBOL(iov_iter_npages);
+
+const void *dup_iter(struct iov_iter *new, struct iov_iter *old, gfp_t flags)
+{
+ *new = *old;
+ if (new->type & ITER_BVEC)
+ return new->bvec = kmemdup(new->bvec,
+ new->nr_segs * sizeof(struct bio_vec),
+ flags);
+ else
+ /* iovec and kvec have identical layout */
+ return new->iov = kmemdup(new->iov,
+ new->nr_segs * sizeof(struct iovec),
+ flags);
+}
+EXPORT_SYMBOL(dup_iter);