libceph: fix messenger CONFIG_BLOCK dependencies

The ceph messenger has a few spots that are only used when
bio messages are supported, and that's only when CONFIG_BLOCK
is defined.  This surrounds a couple of spots with #ifdef's
that would cause a problem if CONFIG_BLOCK were not present
in the kernel configuration.

This resolves:
    http://tracker.ceph.com/issues/3976

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/ceph/messenger.h b/include/linux/ceph/messenger.h
index 14ba5ee738a9..60903e0f665c 100644
--- a/include/linux/ceph/messenger.h
+++ b/include/linux/ceph/messenger.h
@@ -83,9 +83,11 @@ struct ceph_msg {
         struct list_head list_head;
 
         struct kref kref;
+#ifdef CONFIG_BLOCK
         struct bio  *bio;               /* instead of pages/pagelist */
         struct bio  *bio_iter;          /* bio iterator */
         int bio_seg;                    /* current bio segment */
+#endif /* CONFIG_BLOCK */
         struct ceph_pagelist *trail;    /* the trailing part of the data */
         bool front_is_vmalloc;
         bool more_to_follow;