libceph: abort already submitted but abortable requests when map or pool goes full

When a Ceph volume hits capacity, a flag is set in the OSD map to
indicate that, and a new map is sprayed around the cluster. With cephfs
we want it to shut down any abortable requests that are in progress with
an -ENOSPC error as they'd just hang otherwise.

Add a new ceph_osdc_abort_on_full helper function to handle this. It
will first check whether there is an out-of-space condition in the
cluster and then walk the tree and abort any request that has
r_abort_on_full set with a -ENOSPC error. Call this new function
directly whenever we get a new OSD map.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index 52a2019a2b644639ff463682b66de6fcde8ace1c..55b7585ccefdf252460807ef5007b29c0238585e 100644 (file)
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -1807,6 +1807,39 @@ static void abort_request(struct ceph_osd_request *req, int err)
        complete_request(req, err);
 }
 
+/*
+ * Drop all pending requests that are stalled waiting on a full condition to
+ * clear, and complete them with ENOSPC as the return code.
+ */
+static void ceph_osdc_abort_on_full(struct ceph_osd_client *osdc)
+{
+       struct rb_node *n;
+
+       dout("enter abort_on_full\n");
+
+       if (!ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) && !have_pool_full(osdc))
+               goto out;
+
+       for (n = rb_first(&osdc->osds); n; n = rb_next(n)) {
+               struct ceph_osd *osd = rb_entry(n, struct ceph_osd, o_node);
+               struct rb_node *m;
+
+               m = rb_first(&osd->o_requests);
+               while (m) {
+                       struct ceph_osd_request *req = rb_entry(m,
+                                       struct ceph_osd_request, r_node);
+                       m = rb_next(m);
+
+                       if (req->r_abort_on_full &&
+                           (ceph_osdmap_flag(osdc, CEPH_OSDMAP_FULL) ||
+                            pool_full(osdc, req->r_t.target_oloc.pool)))
+                               abort_request(req, -ENOSPC);
+               }
+       }
+out:
+       dout("return abort_on_full\n");
+}
+
 static void check_pool_dne(struct ceph_osd_request *req)
 {
        struct ceph_osd_client *osdc = req->r_osdc;
@@ -3265,6 +3298,7 @@ done:
 
        kick_requests(osdc, &need_resend, &need_resend_linger);
 
+       ceph_osdc_abort_on_full(osdc);
        ceph_monc_got_map(&osdc->client->monc, CEPH_SUB_OSDMAP,
                          osdc->osdmap->epoch);
        up_write(&osdc->lock);