From: "Yan, Zheng" <zyan@redhat.com>
Date: Fri, 18 May 2018 16:05:51 +0800
Subject: ceph: flush pending works before shutdown super
Git-commit: a57d9064e4ee4e9882b922d0627be3d426004c69
Patch-mainline: v4.18-rc1
References: FATE#324714

Pending works hold inode references, which cause "Busy inodes after
unmount" warning.

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Acked-by: Luis Henriques <lhenriques@suse.com>
---
 fs/ceph/super.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index 40664e13cc0f..a092cdb69288 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -674,6 +674,13 @@ static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
 	return ERR_PTR(err);
 }
 
+static void flush_fs_workqueues(struct ceph_fs_client *fsc)
+{
+	flush_workqueue(fsc->wb_wq);
+	flush_workqueue(fsc->pg_inv_wq);
+	flush_workqueue(fsc->trunc_wq);
+}
+
 static void destroy_fs_client(struct ceph_fs_client *fsc)
 {
 	dout("destroy_fs_client %p\n", fsc);
@@ -1089,6 +1096,8 @@ static void ceph_kill_sb(struct super_block *s)
 	dout("kill_sb %p\n", s);
 
 	ceph_mdsc_pre_umount(fsc->mdsc);
+	flush_fs_workqueues(fsc);
+
 	generic_shutdown_super(s);
 
 	fsc->client->extra_mon_dispatch = NULL;