[PATCH 3/4] bio: rename bio_chain arguments

[Andreas Gruenbacher <agruenba@redhat.com>]

Use the same argument names in bio_chain() as in bio_chain_and_submit()
to be consistent.  Slightly improve the function description.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 block/bio.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/block/bio.c b/block/bio.c
index eadf4c1e9994..5e60bf3730af 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -369,22 +369,22 @@ static void bio_chain_endio(struct bio *bio)
 
 /**
  * bio_chain - chain bio completions
- * @bio: the target bio
- * @parent: the parent bio of @bio
+ * @prev: the bio to chain
+ * @new: the bio to chain to
  *
- * The caller won't have a bi_end_io called when @bio completes - instead,
- * @parent's bi_end_io won't be called until both @parent and @bio have
- * completed; the chained bio will also be freed when it completes.
+ * The caller won't have a bi_end_io called when @prev completes.  Instead,
+ * @new's bi_end_io will be called once both @new and @prev have completed.
+ * Like an unchained bio, @prev will be put when it completes.
  *
- * The caller must not set bi_private or bi_end_io in @bio.
+ * The caller must not set bi_private or bi_end_io in @prev.
  */
-void bio_chain(struct bio *bio, struct bio *parent)
+void bio_chain(struct bio *prev, struct bio *new)
 {
-	BUG_ON(bio->bi_private || bio->bi_end_io);
+	BUG_ON(prev->bi_private || prev->bi_end_io);
 
-	bio->bi_private = parent;
-	bio->bi_end_io	= bio_chain_endio;
-	bio_inc_remaining(parent);
+	prev->bi_private = new;
+	prev->bi_end_io	= bio_chain_endio;
+	bio_inc_remaining(new);
 }
 EXPORT_SYMBOL(bio_chain);
 
-- 
2.52.0