ceph: handle SESSION_FORCE_RO message

[deliverable/linux.git] / fs / ceph / caps.c

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index b93c631c6c87d550e1f9674aaec5d41906d12143..d0618e8412fd1e7ba96866bc8c148c7166224d48 100644 (file)
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -2143,6 +2143,21 @@ again:
                        ret = 1;
                }
        } else {
+               int session_readonly = false;
+               if ((need & CEPH_CAP_FILE_WR) && ci->i_auth_cap) {
+                       struct ceph_mds_session *s = ci->i_auth_cap->session;
+                       spin_lock(&s->s_cap_lock);
+                       session_readonly = s->s_readonly;
+                       spin_unlock(&s->s_cap_lock);
+               }
+               if (session_readonly) {
+                       dout("get_cap_refs %p needed %s but mds%d readonly\n",
+                            inode, ceph_cap_string(need), ci->i_auth_cap->mds);
+                       *err = -EROFS;
+                       ret = 1;
+                       goto out_unlock;
+               }
+
                dout("get_cap_refs %p have %s needed %s\n", inode,
                     ceph_cap_string(have), ceph_cap_string(need));
        }