1 files changed, 20 insertions, 0 deletions

diff --git a/fs/bio.c b/fs/bio.c
index 460554b07ff9..4d21ee3873ec 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -386,6 +386,25 @@ static int __bio_add_page(request_queue_t *q, struct bio *bio, struct page
 }
 
 /**
+ *      bio_add_pc_page -       attempt to add page to bio
+ *      @bio: destination bio
+ *      @page: page to add
+ *      @len: vec entry length
+ *      @offset: vec entry offset
+ *
+ *      Attempt to add a page to the bio_vec maplist. This can fail for a
+ *      number of reasons, such as the bio being full or target block
+ *      device limitations. The target block device must allow bio's
+ *      smaller than PAGE_SIZE, so it is always possible to add a single
+ *      page to an empty bio. This should only be used by REQ_PC bios.
+ */
+int bio_add_pc_page(request_queue_t *q, struct bio *bio, struct page *page,
+                    unsigned int len, unsigned int offset)
+{
+        return __bio_add_page(q, bio, page, len, offset);
+}
+
+/**
  *      bio_add_page    -       attempt to add page to bio
  *      @bio: destination bio
  *      @page: page to add
@@ -1228,6 +1247,7 @@ EXPORT_SYMBOL(bio_clone);
 EXPORT_SYMBOL(bio_phys_segments);
 EXPORT_SYMBOL(bio_hw_segments);
 EXPORT_SYMBOL(bio_add_page);
+EXPORT_SYMBOL(bio_add_pc_page);
 EXPORT_SYMBOL(bio_get_nr_vecs);
 EXPORT_SYMBOL(bio_map_user);
 EXPORT_SYMBOL(bio_unmap_user);