From 3fd7cb845bee6281e060e695e99a03dba69b7a1d Mon Sep 17 00:00:00 2001
From: "Darrick J. Wong" <djwong@kernel.org>
Date: Tue, 17 Aug 2021 09:49:42 -0700
Subject: [PATCH] xfs: fix incorrect unit conversion in scrub tracepoint
Git-commit: 3fd7cb845bee6281e060e695e99a03dba69b7a1d
Patch-mainline: v5.15-rc1
References: git-fixes

XFS_DADDR_TO_FSB converts a raw disk address (in units of 512b blocks)
to a raw disk address (in units of fs blocks).  Unfortunately, the
xchk_block_error_class tracepoints incorrectly uses this to decode
xfs_daddr_t into segmented AG number and AG block addresses.  Use the
correct translation code.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Acked-by: Anthony Iliopoulos <ailiop@suse.com>

---
 fs/xfs/scrub/trace.h | 16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

diff --git a/fs/xfs/scrub/trace.h b/fs/xfs/scrub/trace.h
index e46f5cef90da..29f1d0ac7ec5 100644
--- a/fs/xfs/scrub/trace.h
+++ b/fs/xfs/scrub/trace.h
@@ -193,29 +193,21 @@ DECLARE_EVENT_CLASS(xchk_block_error_class,
 		__field(dev_t, dev)
 		__field(unsigned int, type)
 		__field(xfs_agnumber_t, agno)
-		__field(xfs_agblock_t, bno)
+		__field(xfs_agblock_t, agbno)
 		__field(void *, ret_ip)
 	),
 	TP_fast_assign(
-		xfs_fsblock_t	fsbno;
-		xfs_agnumber_t	agno;
-		xfs_agblock_t	bno;
-
-		fsbno = XFS_DADDR_TO_FSB(sc->mp, daddr);
-		agno = XFS_FSB_TO_AGNO(sc->mp, fsbno);
-		bno = XFS_FSB_TO_AGBNO(sc->mp, fsbno);
-
 		__entry->dev = sc->mp->m_super->s_dev;
 		__entry->type = sc->sm->sm_type;
-		__entry->agno = agno;
-		__entry->bno = bno;
+		__entry->agno = xfs_daddr_to_agno(sc->mp, daddr);
+		__entry->agbno = xfs_daddr_to_agbno(sc->mp, daddr);
 		__entry->ret_ip = ret_ip;
 	),
 	TP_printk("dev %d:%d type %s agno %u agbno %u ret_ip %pS",
 		  MAJOR(__entry->dev), MINOR(__entry->dev),
 		  __print_symbolic(__entry->type, XFS_SCRUB_TYPE_STRINGS),
 		  __entry->agno,
-		  __entry->bno,
+		  __entry->agbno,
 		  __entry->ret_ip)
 )
 
-- 
2.43.0