gfs2: Add clean argument to lm_unmount hook

Add a 'clean' argument to ->lm_unmount() that indicates whether the
filesystem is clean or needs recovery. Set clean to true for normal
unmounts, and to false for withdraws.

Signed-off-by: Andreas Gruenbacher <[e-mail]>

fs/gfs2/glock.h

···
 	void (*lm_first_done) (struct gfs2_sbd *sdp);
 	void (*lm_recovery_result) (struct gfs2_sbd *sdp, unsigned int jid,
 				    unsigned int result);
-	void (*lm_unmount) (struct gfs2_sbd *sdp);
+	void (*lm_unmount) (struct gfs2_sbd *sdp, bool clean);
 	void (*lm_withdraw) (struct gfs2_sbd *sdp);
 	void (*lm_put_lock) (struct gfs2_glock *gl);
 	int (*lm_lock) (struct gfs2_glock *gl, unsigned int req_state,

fs/gfs2/lock_dlm.c

···
 		fs_err(sdp, "mount first_done error %d\n", error);
 }
 
-static void gdlm_unmount(struct gfs2_sbd *sdp)
+/*
+ * gdlm_unmount - release our lockspace
+ * @sdp: the superblock
+ * @clean: Indicates whether or not the remaining nodes in the cluster should
+ *	   perform recovery.  Recovery is necessary when a node withdraws and
+ *	   its journal remains dirty.  Recovery isn't necessary when a node
+ *	   cleanly unmounts a filesystem.
+ */
+static void gdlm_unmount(struct gfs2_sbd *sdp, bool clean)
 {
 	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 
···
 release:
 	down_write(&ls->ls_sem);
 	if (ls->ls_dlm) {
-		dlm_release_lockspace(ls->ls_dlm, DLM_RELEASE_NORMAL);
+		dlm_release_lockspace(ls->ls_dlm,
+				      clean ? DLM_RELEASE_NORMAL :
+					      DLM_RELEASE_RECOVER);
 		ls->ls_dlm = NULL;
 	}
 	up_write(&ls->ls_sem);

fs/gfs2/ops_fstype.c

···
 {
 	const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
 	if (!gfs2_withdrawing_or_withdrawn(sdp) && lm->lm_unmount)
-		lm->lm_unmount(sdp);
+		lm->lm_unmount(sdp, true);
 }
 
 static int wait_on_journal(struct gfs2_sbd *sdp)

fs/gfs2/util.c

···
 
 		if (lm->lm_unmount) {
 			fs_err(sdp, "telling LM to unmount\n");
-			lm->lm_unmount(sdp);
+			lm->lm_unmount(sdp, false);
 		}
 		fs_err(sdp, "File system withdrawn\n");
 		dump_stack();