ceph: handle ESTALE properly; on receipt send to authority if it wasn't
Signed-off-by: Greg Farnum <gregf@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index a546e0d..34d215f 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -1628,6 +1628,15 @@
req->r_mds = mds;
req->r_attempts++;
+ if (req->r_inode) {
+ struct ceph_cap *cap =
+ ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
+
+ if (cap)
+ req->r_sent_on_mseq = cap->mseq;
+ else
+ req->r_sent_on_mseq = -1;
+ }
dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
@@ -1962,21 +1971,39 @@
result = le32_to_cpu(head->result);
/*
- * Tolerate 2 consecutive ESTALEs from the same mds.
- * FIXME: we should be looking at the cap migrate_seq.
+ * Handle an ESTALE
+ * if we're not talking to the authority, send to them
+ * if the authority has changed while we weren't looking,
+ * send to new authority
+ * Otherwise we just have to return an ESTALE
*/
if (result == -ESTALE) {
- req->r_direct_mode = USE_AUTH_MDS;
- req->r_num_stale++;
- if (req->r_num_stale <= 2) {
+ dout("got ESTALE on request %llu", req->r_tid);
+ if (!req->r_inode) ; //do nothing; not an authority problem
+ else if (req->r_direct_mode != USE_AUTH_MDS) {
+ dout("not using auth, setting for that now");
+ req->r_direct_mode = USE_AUTH_MDS;
__do_request(mdsc, req);
mutex_unlock(&mdsc->mutex);
goto out;
+ } else {
+ struct ceph_inode_info *ci = ceph_inode(req->r_inode);
+ struct ceph_cap *cap =
+ ceph_get_cap_for_mds(ci, req->r_mds);;
+
+ dout("already using auth");
+ if ((!cap || cap != ci->i_auth_cap) ||
+ (cap->mseq != req->r_sent_on_mseq)) {
+ dout("but cap changed, so resending");
+ __do_request(mdsc, req);
+ mutex_unlock(&mdsc->mutex);
+ goto out;
+ }
}
- } else {
- req->r_num_stale = 0;
+ dout("have to return ESTALE on request %llu", req->r_tid);
}
+
if (head->safe) {
req->r_got_safe = true;
__unregister_request(mdsc, req);
