qa: test for root_squash with multiple caps

Where the client has root_squash for one cap but not for another. The fs
without root_squash should not necessarily reject the client.

Signed-off-by: Patrick Donnelly <pdonnell@redhat.com>
(cherry picked from commit bccc8ce)

Conflicts:
	qa/tasks/cephfs/test_admin.py: missing test

qa/tasks/cephfs/test_admin.py

@@ -1320,6 +1320,40 @@ def test_single_path_rootsquash(self):
         self.captester.conduct_neg_test_for_chown_caps()
         self.captester.conduct_neg_test_for_truncate_caps()
 
+    def test_multifs_rootsquash_nofeature(self):
+        """
+        That having root_squash on one fs doesn't prevent access to others.
+        """
+
+        if not isinstance(self.mount_a, FuseMount):
+            self.skipTest("only FUSE client has CEPHFS_FEATURE_MDS_AUTH_CAPS "
+                          "needed to enforce root_squash MDS caps")
+
+        self.fs1 = self.fs
+        self.fs2 = self.mds_cluster.newfs('testcephfs2')
+
+        self.mount_a.umount_wait()
+
+        # Authorize client to fs1
+        FS_AUTH_CAPS = (('/', 'rw'),)
+        self.fs1.authorize(self.client_id, FS_AUTH_CAPS)
+
+        FS_AUTH_CAPS = (('/', 'rw', 'root_squash'),)
+        keyring = self.fs2.authorize(self.client_id, FS_AUTH_CAPS)
+
+        CEPHFS_FEATURE_MDS_AUTH_CAPS_CHECK = 21
+        # all but CEPHFS_FEATURE_MDS_AUTH_CAPS_CHECK
+        features = ",".join([str(i) for i in range(CEPHFS_FEATURE_MDS_AUTH_CAPS_CHECK)])
+        mntargs = [f"--client_debug_inject_features={features}"]
+
+        # should succeed
+        keyring_path = self.mount_a.client_remote.mktemp(data=keyring)
+        self.mount_a.remount(client_id=self.client_id, client_keyring_path=keyring_path, mntargs=mntargs, cephfs_name=self.fs1.name)
+
+        captester = CapTester(self.mount_a, '/')
+        captester.conduct_pos_test_for_read_caps()
+        captester.conduct_pos_test_for_open_caps()
+
     def test_single_path_rootsquash_issue_56067(self):
         """
         That a FS client using root squash MDS caps allows non-root user to write data