From fa1bcbe0a54c67a293c557a21641565516c96a8f Mon Sep 17 00:00:00 2001 From: David Sterba Date: Mon, 12 Jun 2017 17:29:36 +0200 Subject: [PATCH] btrfs: document mandatory order of bio in btrfs_io_bio Signed-off-by: David Sterba --- fs/btrfs/volumes.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index 58b97b6f5f02..35327efecdbb 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -281,6 +281,10 @@ struct btrfs_io_bio { u8 *csum_allocated; btrfs_io_bio_end_io_t *end_io; struct bvec_iter iter; + /* + * This member must come last, bio_alloc_bioset will allocate enough + * bytes for entire btrfs_io_bio but relies on bio being last. + */ struct bio bio; }; -- 2.20.1