From: "Yan, Zheng" <zyan@redhat.com>
Date: Wed, 4 Mar 2020 21:22:20 +0800
Subject: ceph: update dentry lease for async create
Git-commit: 3313f66a57ed73a47162af642e2c8d3995cae058
Patch-mainline: v5.7-rc1
References: jsc#SES-1134

Otherwise ceph_d_delete() may return 1 for the dentry, which makes
dput() prune the dentry and clear parent dir's complete flag.

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Acked-by: Luis Henriques <lhenriques@suse.com>
---
 fs/ceph/file.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 67080721cec8..a6c484123d98 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -480,6 +480,9 @@ static int try_prep_async_create(struct inode *dir, struct dentry *dentry,
 	if (d_in_lookup(dentry)) {
 		if (!__ceph_dir_is_complete(ci))
 			goto no_async;
+		spin_lock(&dentry->d_lock);
+		di->lease_shared_gen = atomic_read(&ci->i_shared_gen);
+		spin_unlock(&dentry->d_lock);
 	} else if (atomic_read(&ci->i_shared_gen) !=
 		   READ_ONCE(di->lease_shared_gen)) {
 		goto no_async;