linux-kernel - [PATCH 5.14 261/432] gfs2: Fix glock recursion in freeze_go_xmote

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Message-Id: <20210916155819.669871805@linuxfoundation.org>
Date:   Thu, 16 Sep 2021 18:00:10 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Bob Peterson <rpeterso@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.14 261/432] gfs2: Fix glock recursion in freeze_go_xmote_bh

From: Bob Peterson <rpeterso@...hat.com>

[ Upstream commit 9d9b16054b7d357afde69a027514c695092b0d22 ]

We must not call gfs2_consist (which does a file system withdraw) from
the freeze glock's freeze_go_xmote_bh function because the withdraw
will try to use the freeze glock, thus causing a glock recursion error.

This patch changes freeze_go_xmote_bh to call function
gfs2_assert_withdraw_delayed instead of gfs2_consist to avoid recursion.

Signed-off-by: Bob Peterson <rpeterso@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/gfs2/glops.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
index 54d3fbeb3002..384565d63eea 100644
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -610,16 +610,13 @@ static int freeze_go_xmote_bh(struct gfs2_glock *gl)
 		j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 
 		error = gfs2_find_jhead(sdp->sd_jdesc, &head, false);
-		if (error)
-			gfs2_consist(sdp);
-		if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
-			gfs2_consist(sdp);
-
-		/*  Initialize some head of the log stuff  */
-		if (!gfs2_withdrawn(sdp)) {
-			sdp->sd_log_sequence = head.lh_sequence + 1;
-			gfs2_log_pointers_init(sdp, head.lh_blkno);
-		}
+		if (gfs2_assert_withdraw_delayed(sdp, !error))
+			return error;
+		if (gfs2_assert_withdraw_delayed(sdp, head.lh_flags &
+						 GFS2_LOG_HEAD_UNMOUNT))
+			return -EIO;
+		sdp->sd_log_sequence = head.lh_sequence + 1;
+		gfs2_log_pointers_init(sdp, head.lh_blkno);
 	}
 	return 0;
 }
-- 
2.30.2