Commit 716a3cf3 authored May 09, 2023 by Steve French

smb3: fix problem remounting a share after shutdown



xfstests generic/392 showed a problem where even after a
shutdown call was made on a mount, we would still attempt
to use the (now inaccessible) superblock if another mount
was attempted for the same share.

Reported-by: David Howells <dhowells@redhat.com>
Reviewed-by: David Howells <dhowells@redhat.com>
Cc: <stable@vger.kernel.org>
Fixes: 087f757b ("cifs: add shutdown support")
Signed-off-by: Steve French <stfrench@microsoft.com>

parent 2cb6f968

fs/cifs/connect.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -2709,6 +2709,13 @@ cifs_match_super(struct super_block sb, void data)

		spin_lock(&cifs_tcp_ses_lock);
		cifs_sb = CIFS_SB(sb);

		/* We do not want to use a superblock that has been shutdown */
		if (CIFS_MOUNT_SHUTDOWN & cifs_sb->mnt_cifs_flags) {
		spin_unlock(&cifs_tcp_ses_lock);
		return 0;
		}

		tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
		if (tlink == NULL) {
		/* can not match superblock if tlink were ever null */