[GFS2] Remove unused code from glock layer

Remove the unused sync feature from glocks. This is currently done by
calling the required functions to sync pages/blocks directly so this
code isn't needed.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

fs/gfs2/glock.c

@@ -1296,9 +1296,6 @@ void gfs2_glock_dq(struct gfs2_holder *gh)
 	struct gfs2_glock *gl = gh->gh_gl;
 	const struct gfs2_glock_operations *glops = gl->gl_ops;
 
-	if (gh->gh_flags & GL_SYNC)
-		set_bit(GLF_SYNC, &gl->gl_flags);
-
 	if (gh->gh_flags & GL_NOCACHE)
 		handle_callback(gl, LM_ST_UNLOCKED);
 
@@ -1313,11 +1310,6 @@ void gfs2_glock_dq(struct gfs2_holder *gh)
 		if (glops->go_unlock)
 			glops->go_unlock(gh);
 
-		if (test_bit(GLF_SYNC, &gl->gl_flags)) {
-			if (glops->go_sync)
-				glops->go_sync(gl, DIO_METADATA | DIO_DATA);
-		}
-
 		gl->gl_stamp = jiffies;
 
 		spin_lock(&gl->gl_spin);

fs/gfs2/glock.h

@@ -24,7 +24,6 @@
 #define GL_SKIP			0x00000100
 #define GL_ATIME		0x00000200
 #define GL_NOCACHE		0x00000400
-#define GL_SYNC			0x00000800
 #define GL_NOCANCEL		0x00001000
 #define GL_AOP			0x00004000
 #define GL_DUMP			0x00008000

fs/gfs2/glops.c

@@ -137,7 +137,6 @@ static void meta_go_sync(struct gfs2_glock *gl, int flags)
 			gfs2_ail_empty_gl(gl);
 	}
 
-	clear_bit(GLF_SYNC, &gl->gl_flags);
 }
 
 /**
@@ -236,7 +235,6 @@ static void inode_go_sync(struct gfs2_glock *gl, int flags)
 			gfs2_ail_empty_gl(gl);
 	}
 
-	clear_bit(GLF_SYNC, &gl->gl_flags);
 }
 
 /**

fs/gfs2/incore.h

@@ -167,7 +167,6 @@ enum {
 	GLF_LOCK		= 1,
 	GLF_STICKY		= 2,
 	GLF_PREFETCH		= 3,
-	GLF_SYNC		= 4,
 	GLF_DIRTY		= 5,
 	GLF_SKIP_WAITERS2	= 6,
 	GLF_GREEDY		= 7,