[PATCH 08/16] xfs_repair: complain about bad interior btree pointers

["Darrick J. Wong" <darrick.wong@oracle.com>]

From: Darrick J. Wong <darrick.wong@oracle.com>

Actually complain about garbage btree node pointers, don't just silently
ignore them.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 libxfs/libxfs_api_defs.h |    1 +
 repair/scan.c            |   55 +++++++++++++++++++++++++++++++++-------------
 2 files changed, 41 insertions(+), 15 deletions(-)


diff --git a/libxfs/libxfs_api_defs.h b/libxfs/libxfs_api_defs.h
index 4462036b..7b264ff2 100644
--- a/libxfs/libxfs_api_defs.h
+++ b/libxfs/libxfs_api_defs.h
@@ -180,6 +180,7 @@
 #define xfs_trans_roll_inode		libxfs_trans_roll_inode
 #define xfs_trans_roll			libxfs_trans_roll
 
+#define xfs_verify_agbno		libxfs_verify_agbno
 #define xfs_verify_cksum		libxfs_verify_cksum
 #define xfs_verify_dir_ino		libxfs_verify_dir_ino
 #define xfs_verify_ino			libxfs_verify_ino
diff --git a/repair/scan.c b/repair/scan.c
index fff54ecf..719ad035 100644
--- a/repair/scan.c
+++ b/repair/scan.c
@@ -779,6 +779,14 @@ _("%s freespace btree block claimed (state %d), agno %d, bno %d, suspect %d\n"),
 	for (i = 0; i < numrecs; i++)  {
 		xfs_agblock_t		agbno = be32_to_cpu(pp[i]);
 
+		if (!libxfs_verify_agbno(mp, agno, agbno)) {
+			do_warn(
+	_("bad btree pointer (%u) in %sbt block %u/%u\n"),
+				agbno, name, agno, bno);
+			suspect++;
+			return;
+		}
+
 		/*
 		 * XXX - put sibling detection right here.
 		 * we know our sibling chain is good.  So as we go,
@@ -788,10 +796,8 @@ _("%s freespace btree block claimed (state %d), agno %d, bno %d, suspect %d\n"),
 		 * pointer mismatch, try and extract as much data
 		 * as possible.
 		 */
-		if (agbno != 0 && verify_agbno(mp, agno, agbno)) {
-			scan_sbtree(agbno, level, agno, suspect, scan_allocbt,
-				    0, magic, priv, ops);
-		}
+		scan_sbtree(agbno, level, agno, suspect, scan_allocbt, 0,
+				magic, priv, ops);
 	}
 }
 
@@ -1234,10 +1240,16 @@ _("%s rmap btree block claimed (state %d), agno %d, bno %d, suspect %d\n"),
 			continue;
 		}
 
-		if (agbno != 0 && verify_agbno(mp, agno, agbno)) {
-			scan_sbtree(agbno, level, agno, suspect, scan_rmapbt, 0,
-				    magic, priv, ops);
+		if (!libxfs_verify_agbno(mp, agno, agbno)) {
+			do_warn(
+	_("bad btree pointer (%u) in %sbt block %u/%u\n"),
+				agbno, name, agno, bno);
+			suspect++;
+			return;
 		}
+
+		scan_sbtree(agbno, level, agno, suspect, scan_rmapbt, 0, magic,
+				priv, ops);
 	}
 
 out:
@@ -1454,10 +1466,16 @@ _("extent (%u/%u) len %u claimed, state is %d\n"),
 	for (i = 0; i < numrecs; i++)  {
 		xfs_agblock_t		agbno = be32_to_cpu(pp[i]);
 
-		if (agbno != 0 && verify_agbno(mp, agno, agbno)) {
-			scan_sbtree(agbno, level, agno, suspect, scan_refcbt, 0,
-				    magic, priv, ops);
+		if (!libxfs_verify_agbno(mp, agno, agbno)) {
+			do_warn(
+	_("bad btree pointer (%u) in %sbt block %u/%u\n"),
+				agbno, name, agno, bno);
+			suspect++;
+			return;
 		}
+
+		scan_sbtree(agbno, level, agno, suspect, scan_refcbt, 0, magic,
+				priv, ops);
 	}
 out:
 	if (suspect)
@@ -2125,11 +2143,18 @@ _("%sbt btree block claimed (state %d), agno %d, bno %d, suspect %d\n"),
 	}
 
 	for (i = 0; i < numrecs; i++)  {
-		if (be32_to_cpu(pp[i]) != 0 && verify_agbno(mp, agno,
-							be32_to_cpu(pp[i])))
-			scan_sbtree(be32_to_cpu(pp[i]), level, agno,
-					suspect, scan_inobt, 0, magic, priv,
-					ops);
+		xfs_agblock_t	agbno = be32_to_cpu(pp[i]);
+
+		if (!libxfs_verify_agbno(mp, agno, agbno)) {
+			do_warn(
+	_("bad btree pointer (%u) in %sbt block %u/%u\n"),
+				agbno, name, agno, bno);
+			suspect++;
+			return;
+		}
+
+		scan_sbtree(be32_to_cpu(pp[i]), level, agno, suspect,
+				scan_inobt, 0, magic, priv, ops);
 	}
 }