[Cluster-devel] [gfs2 PATCH] gfs2: Fix glock recursion in freeze_go_xmote_bh

[Cluster-devel] [gfs2 PATCH] gfs2: Fix glock recursion in freeze_go_xmote_bh

[Bob Peterson]

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@redhat.com>
---
 fs/gfs2/glops.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
index 54d3fbeb3002..4939308d54f3 100644
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -604,24 +604,24 @@ static int freeze_go_xmote_bh(struct gfs2_glock *gl)
 	struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 	struct gfs2_glock *j_gl = ip->i_gl;
 	struct gfs2_log_header_host head;
-	int error;
+	int error = 0;
 
 	if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
 		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))
+			goto out;
+		if (gfs2_assert_withdraw_delayed(sdp, head.lh_flags &
+						 GFS2_LOG_HEAD_UNMOUNT)) {
+			error = -EIO;
+			goto out;
 		}
+		sdp->sd_log_sequence = head.lh_sequence + 1;
+		gfs2_log_pointers_init(sdp, head.lh_blkno);
 	}
-	return 0;
+out:
+	return error;
 }
 
 /**