[GFS2] Remove obsolete conversion deadlock avoidance code

This is only used by GFS1 so can be removed.

Signed-off-by: Steven Whitehouse <[e-mail]>

fs/gfs2/locking/dlm/lock.c

···
 {
 	struct gdlm_ls *ls = lp->ls;
 	struct lm_async_cb acb;
-	s16 prev_mode = lp->cur;
 
 	memset(&acb, 0, sizeof(acb));
 
···
 			 lp->lksb.sb_status, lp->lockname.ln_type,
 			 (unsigned long long)lp->lockname.ln_number,
 			 lp->flags);
-		if (lp->lksb.sb_status == -EDEADLOCK &&
-		    lp->ls->fsflags & LM_MFLAG_CONV_NODROP) {
-			lp->req = lp->cur;
-			acb.lc_ret |= LM_OUT_CONV_DEADLK;
-			if (lp->cur == DLM_LOCK_IV)
-				lp->lksb.sb_lkid = 0;
-			goto out;
-		} else
-			return;
+		return;
 	}
 
 	/*
···
 
 	acb.lc_name = lp->lockname;
 	acb.lc_ret |= gdlm_make_lmstate(lp->cur);
-
-	if (!test_and_clear_bit(LFL_NOCACHE, &lp->flags) &&
-	    (lp->cur > DLM_LOCK_NL) && (prev_mode > DLM_LOCK_NL))
-		acb.lc_ret |= LM_OUT_CACHEABLE;
 
 	ls->fscb(ls->sdp, LM_CB_ASYNC, &acb);
 }
···
 
 	if (lp->lksb.sb_lkid != 0) {
 		lkf |= DLM_LKF_CONVERT;
-
-		/* Conversion deadlock avoidance by DLM */
-
-		if (!(lp->ls->fsflags & LM_MFLAG_CONV_NODROP) &&
-		    !test_bit(LFL_FORCE_PROMOTE, &lp->flags) &&
-		    !(lkf & DLM_LKF_NOQUEUE) &&
-		    cur > DLM_LOCK_NL && req > DLM_LOCK_NL && cur != req)
-			lkf |= DLM_LKF_CONVDEADLK;
 	}
 
 	if (lp->lvb)

include/linux/lm_interface.h

···
  */
 
 #define LM_OUT_ST_MASK		0x00000003
-#define LM_OUT_CACHEABLE	0x00000004
 #define LM_OUT_CANCELED		0x00000008
 #define LM_OUT_ASYNC		0x00000080
 #define LM_OUT_ERROR		0x00000100
-#define LM_OUT_CONV_DEADLK	0x00000200
 
 /*
  * lm_callback_t types