ceph: handle SESSION_FORCE_RO message
mark session as readonly and wake up all cap waiters.
Signed-off-by: Yan, Zheng <zyan@redhat.com>
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index b93c631..d0618e8 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -2143,6 +2143,21 @@
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));
}
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index d2171f4..c6c33b4 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -2580,6 +2580,14 @@
send_flushmsg_ack(mdsc, session, seq);
break;
+ case CEPH_SESSION_FORCE_RO:
+ dout("force_session_readonly %p\n", session);
+ spin_lock(&session->s_cap_lock);
+ session->s_readonly = true;
+ spin_unlock(&session->s_cap_lock);
+ wake_up_session_caps(session, 0);
+ break;
+
default:
pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
WARN_ON(1);
@@ -2791,6 +2799,8 @@
spin_unlock(&session->s_gen_ttl_lock);
spin_lock(&session->s_cap_lock);
+ /* don't know if session is readonly */
+ session->s_readonly = 0;
/*
* notify __ceph_remove_cap() that we are composing cap reconnect.
* If a cap get released before being added to the cap reconnect,
diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h
index e2817d0..a87b92f 100644
--- a/fs/ceph/mds_client.h
+++ b/fs/ceph/mds_client.h
@@ -137,6 +137,7 @@
int s_nr_caps, s_trim_caps;
int s_num_cap_releases;
int s_cap_reconnect;
+ int s_readonly;
struct list_head s_cap_releases; /* waiting cap_release messages */
struct list_head s_cap_releases_done; /* ready to send */
struct ceph_cap *s_cap_iterator;
diff --git a/include/linux/ceph/ceph_fs.h b/include/linux/ceph/ceph_fs.h
index 69e2c9e..31eb03d 100644
--- a/include/linux/ceph/ceph_fs.h
+++ b/include/linux/ceph/ceph_fs.h
@@ -271,6 +271,7 @@
CEPH_SESSION_RECALL_STATE,
CEPH_SESSION_FLUSHMSG,
CEPH_SESSION_FLUSHMSG_ACK,
+ CEPH_SESSION_FORCE_RO,
};
extern const char *ceph_session_op_name(int op);
