btrfs: take an fs_info directly when the root is not used otherwise

There are loads of functions in btrfs that accept a root parameter
but only use it to obtain an fs_info pointer.  Let's convert those to
just accept an fs_info pointer directly.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/fs/btrfs/check-integrity.h b/fs/btrfs/check-integrity.h
index f78dff1..2de58a9 100644
--- a/fs/btrfs/check-integrity.h
+++ b/fs/btrfs/check-integrity.h
@@ -29,10 +29,9 @@ int btrfsic_submit_bio_wait(struct bio *bio);
 #define btrfsic_submit_bio_wait submit_bio_wait
 #endif
 
-int btrfsic_mount(struct btrfs_root *root,
+int btrfsic_mount(struct btrfs_fs_info *fs_info,
 		  struct btrfs_fs_devices *fs_devices,
 		  int including_extent_data, u32 print_mask);
-void btrfsic_unmount(struct btrfs_root *root,
-		     struct btrfs_fs_devices *fs_devices);
+void btrfsic_unmount(struct btrfs_fs_devices *fs_devices);
 
 #endif