btrfs: fix compile when block cgroups are not enabled

bio->bi_css and bio->bi_ioc don't exist when block cgroups are not on.
This adds an ifdef around them.  It's not perfect, but our
use of bi_ioc is being removed in the 4.3 merge window.

The bi_css usage really should go into bio_clone, but I want to make
sure that doesn't introduce problems for other bio_clone use cases.

Signed-off-by: Chris Mason <clm@fb.com>

2 files changed, 5 insertions, 0 deletions

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 3cfbd6261f9b..fa19f2f68c1b 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2730,9 +2730,12 @@ struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask)
                 btrfs_bio->csum = NULL;
                 btrfs_bio->csum_allocated = NULL;
                 btrfs_bio->end_io = NULL;
+
+#ifdef CONFIG_BLK_CGROUP
                 /* FIXME, put this into bio_clone_bioset */
                 if (bio->bi_css)
                         bio_associate_blkcg(new, bio->bi_css);
+#endif
         }
         return new;
 }
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 53a38075911e..69520dfa8960 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -5955,6 +5955,7 @@ again:
         if (!bio)
                 return -ENOMEM;
 
+#ifdef CONFIG_BLK_CGROUP
         if (first_bio->bi_ioc) {
                 get_io_context_active(first_bio->bi_ioc);
                 bio->bi_ioc = first_bio->bi_ioc;
@@ -5963,6 +5964,7 @@ again:
                 css_get(first_bio->bi_css);
                 bio->bi_css = first_bio->bi_css;
         }
+#endif
         while (bvec <= (first_bio->bi_io_vec + first_bio->bi_vcnt - 1)) {
                 if (bio_add_page(bio, bvec->bv_page, bvec->bv_len,
                                  bvec->bv_offset) < bvec->bv_len) {