From 629dcb38dc351947ed6a26a997d4b587f3bd5c7e Mon Sep 17 00:00:00 2001
From: Brian Foster <bfoster@redhat.com>
Date: Wed, 6 May 2020 13:25:22 -0700
Subject: [PATCH] xfs: fix duplicate verification from xfs_qm_dqflush()
Git-commit: 629dcb38dc351947ed6a26a997d4b587f3bd5c7e
Patch-mainline: v5.8-rc1
References: git-fixes

The pre-flush dquot verification in xfs_qm_dqflush() duplicates the
read verifier by checking the dquot in the on-disk buffer. Instead,
verify the in-core variant before it is flushed to the buffer.

Fixes: 7224fa482a6d ("xfs: add full xfs_dqblk verifier")
Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Allison Collins <allison.henderson@oracle.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Acked-by: Anthony Iliopoulos <ailiop@suse.com>

---
 fs/xfs/xfs_dquot.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/fs/xfs/xfs_dquot.c b/fs/xfs/xfs_dquot.c
index af2c8e5ceea028..265feb62290d0e 100644
--- a/fs/xfs/xfs_dquot.c
+++ b/fs/xfs/xfs_dquot.c
@@ -1116,13 +1116,12 @@ xfs_qm_dqflush(
 	dqb = bp->b_addr + dqp->q_bufoffset;
 	ddqp = &dqb->dd_diskdq;

-	/*
-	 * A simple sanity check in case we got a corrupted dquot.
-	 */
-	fa = xfs_dqblk_verify(mp, dqb, be32_to_cpu(ddqp->d_id), 0);
+	/* sanity check the in-core structure before we flush */
+	fa = xfs_dquot_verify(mp, &dqp->q_core, be32_to_cpu(dqp->q_core.d_id),
+			      0);
 	if (fa) {
 		xfs_alert(mp, "corrupt dquot ID 0x%x in memory at %pS",
-				be32_to_cpu(ddqp->d_id), fa);
+				be32_to_cpu(dqp->q_core.d_id), fa);
 		xfs_buf_relse(bp);
 		xfs_dqfunlock(dqp);
 		xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
--
2.27.0