cifs: return -ENODATA when deleting an xattr that does not exist

BUGZILLA: https://bugzilla.kernel.org/show_bug.cgi?id=202007

When deleting an xattr/EA:
SMB2/3 servers will return SUCCESS when clients delete non-existing EAs.
This means that we need to first QUERY the server and check if the EA
exists or not so that we can return -ENODATA correctly when this happens.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 6f96e22928569e08aa0faab6c49f8941573cf21d..991c2d40c0efac7c2397e570c65883ed0d508a5e 100644 (file)
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -940,6 +940,16 @@ smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
        resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
        memset(rsp_iov, 0, sizeof(rsp_iov));
 
+       if (ses->server->ops->query_all_EAs) {
+               if (!ea_value) {
+                       rc = ses->server->ops->query_all_EAs(xid, tcon, path,
+                                                            ea_name, NULL, 0,
+                                                            cifs_sb);
+                       if (rc == -ENODATA)
+                               goto sea_exit;
+               }
+       }
+
        /* Open */
        memset(&open_iov, 0, sizeof(open_iov));
        rqst[0].rq_iov = open_iov;