From 72244b6bc752b5c496f09de9a13c18adc314a53c Mon Sep 17 00:00:00 2001
From: Bob Peterson <rpeterso@redhat.com>
Date: Wed, 15 Aug 2018 12:09:49 -0500
Subject: [PATCH] gfs2: improve debug information when lvb mismatches are found

Before this patch, gfs2_rgrp_bh_get would check for lvb mismatches,
but it wouldn't tell you what was actually wrong. This patch adds
more information to help us debug it. It also makes rgrp consistency
checks dump any bad rgrps, and the rgrp dump code dump any lvbs
as well as the rgrp itself.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Acked-by: Steven Whitehouse <swhiteho@redhat.com>
---
 fs/gfs2/rgrp.c | 41 ++++++++++++++++++++++++++++++++++++-----
 fs/gfs2/util.c |  3 +++
 2 files changed, 39 insertions(+), 5 deletions(-)

diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 1ad3256b9cbc..44a4cbc043dd 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -1103,12 +1103,35 @@ static int gfs2_rgrp_lvb_valid(struct gfs2_rgrpd *rgd)
 {
 	struct gfs2_rgrp_lvb *rgl = rgd->rd_rgl;
 	struct gfs2_rgrp *str = (struct gfs2_rgrp *)rgd->rd_bits[0].bi_bh->b_data;
+	int valid = 1;
 
-	if (rgl->rl_flags != str->rg_flags || rgl->rl_free != str->rg_free ||
-	    rgl->rl_dinodes != str->rg_dinodes ||
-	    rgl->rl_igeneration != str->rg_igeneration)
-		return 0;
-	return 1;
+	if (rgl->rl_flags != str->rg_flags) {
+		printk(KERN_WARNING "GFS2: rgd: %llu lvb flag mismatch %u/%u",
+		       (unsigned long long)rgd->rd_addr,
+		       be32_to_cpu(rgl->rl_flags), be32_to_cpu(str->rg_flags));
+		valid = 0;
+	}
+	if (rgl->rl_free != str->rg_free) {
+		printk(KERN_WARNING "GFS2: rgd: %llu lvb free mismatch %u/%u",
+		       (unsigned long long)rgd->rd_addr,
+		       be32_to_cpu(rgl->rl_free), be32_to_cpu(str->rg_free));
+		valid = 0;
+	}
+	if (rgl->rl_dinodes != str->rg_dinodes) {
+		printk(KERN_WARNING "GFS2: rgd: %llu lvb dinode mismatch %u/%u",
+		       (unsigned long long)rgd->rd_addr,
+		       be32_to_cpu(rgl->rl_dinodes),
+		       be32_to_cpu(str->rg_dinodes));
+		valid = 0;
+	}
+	if (rgl->rl_igeneration != str->rg_igeneration) {
+		printk(KERN_WARNING "GFS2: rgd: %llu lvb igen mismatch "
+		       "%llu/%llu", (unsigned long long)rgd->rd_addr,
+		       (unsigned long long)be64_to_cpu(rgl->rl_igeneration),
+		       (unsigned long long)be64_to_cpu(str->rg_igeneration));
+		valid = 0;
+	}
+	return valid;
 }
 
 static u32 count_unlinked(struct gfs2_rgrpd *rgd)
@@ -2244,6 +2267,14 @@ void gfs2_rgrp_dump(struct seq_file *seq, const struct gfs2_glock *gl)
 		       (unsigned long long)rgd->rd_addr, rgd->rd_flags,
 		       rgd->rd_free, rgd->rd_free_clone, rgd->rd_dinodes,
 		       rgd->rd_reserved, rgd->rd_extfail_pt);
+	if (rgd->rd_sbd->sd_args.ar_rgrplvb) {
+		struct gfs2_rgrp_lvb *rgl = rgd->rd_rgl;
+
+		gfs2_print_dbg(seq, "  L: f:%02x b:%u i:%u\n",
+			       be32_to_cpu(rgl->rl_flags),
+			       be32_to_cpu(rgl->rl_free),
+			       be32_to_cpu(rgl->rl_dinodes));
+	}
 	spin_lock(&rgd->rd_rsspin);
 	for (n = rb_first(&rgd->rd_rstree); n; n = rb_next(&trs->rs_node)) {
 		trs = rb_entry(n, struct gfs2_blkreserv, rs_node);
diff --git a/fs/gfs2/util.c b/fs/gfs2/util.c
index 59c811de0dc7..b072b10fb635 100644
--- a/fs/gfs2/util.c
+++ b/fs/gfs2/util.c
@@ -19,6 +19,7 @@
 #include "gfs2.h"
 #include "incore.h"
 #include "glock.h"
+#include "rgrp.h"
 #include "util.h"
 
 struct kmem_cache *gfs2_glock_cachep __read_mostly;
@@ -181,6 +182,8 @@ int gfs2_consist_rgrpd_i(struct gfs2_rgrpd *rgd, int cluster_wide,
 {
 	struct gfs2_sbd *sdp = rgd->rd_sbd;
 	int rv;
+
+	gfs2_rgrp_dump(NULL, rgd->rd_gl);
 	rv = gfs2_lm_withdraw(sdp,
 			      "fatal: filesystem consistency error\n"
 			      "  RG = %llu\n"