From: Steve French <stfrench@microsoft.com>
Date: Wed, 10 May 2023 17:42:21 -0500
Subject: [PATCH] cifs: release leases for deferred close handles when freezing
References: bsc#1012628
Patch-mainline: 6.3.3
Git-commit: d39fc592ef8ae9a89c5e85c8d9f760937a57d5ba

commit d39fc592ef8ae9a89c5e85c8d9f760937a57d5ba upstream.

We should not be caching closed files when freeze is invoked on an fs
(so we can release resources more gracefully).

Fixes xfstests generic/068 generic/390 generic/491

Reviewed-by: David Howells <dhowells@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 fs/cifs/cifsfs.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index ac9034fc..c8c17247 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -759,6 +759,20 @@ static void cifs_umount_begin(struct super_block *sb)
 	return;
 }
 
+static int cifs_freeze(struct super_block *sb)
+{
+	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+	struct cifs_tcon *tcon;
+
+	if (cifs_sb == NULL)
+		return 0;
+
+	tcon = cifs_sb_master_tcon(cifs_sb);
+
+	cifs_close_all_deferred_files(tcon);
+	return 0;
+}
+
 #ifdef CONFIG_CIFS_STATS2
 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
 {
@@ -797,6 +811,7 @@ static const struct super_operations cifs_super_ops = {
 	as opens */
 	.show_options = cifs_show_options,
 	.umount_begin   = cifs_umount_begin,
+	.freeze_fs      = cifs_freeze,
 #ifdef CONFIG_CIFS_STATS2
 	.show_stats = cifs_show_stats,
 #endif
-- 
2.35.3