[GFS2] Make headers compile on their own

As per Jan Engelhardt's comments, this should make all the headers
compile on their own by including and/or declaring structures
early.

Cc: Jan Engelhardt <jengelh@linux01.gwdg.de>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/gfs2/glock.h b/fs/gfs2/glock.h
index 4762cdb04f64..2e1d32866321 100644
--- a/fs/gfs2/glock.h
+++ b/fs/gfs2/glock.h
@@ -10,6 +10,8 @@
 #ifndef __GLOCK_DOT_H__
 #define __GLOCK_DOT_H__
 
+#include "incore.h"
+
 /* Flags for lock requests; used in gfs2_holder gh_flag field.
    From lm_interface.h:
 #define LM_FLAG_TRY             0x00000001