libceph: primary_temp infrastructure

Add primary_temp mappings infrastructure.  struct ceph_pg_mapping is
overloaded, primary_temp mappings are stored in an rb-tree, rooted at
ceph_osdmap, in a manner similar to pg_temp mappings.

Dump primary_temp mappings to /sys/kernel/debug/ceph/<client>/osdmap,
one 'primary_temp <pgid> <osd>' per line, e.g:

    primary_temp 2.6 4

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/net/ceph/debugfs.c b/net/ceph/debugfs.c
index 5865f2c9580a..612bf55e6a8b 100644
--- a/net/ceph/debugfs.c
+++ b/net/ceph/debugfs.c
@@ -93,6 +93,13 @@ static int osdmap_show(struct seq_file *s, void *p)
                                    pg->pg_temp.osds[i]);
                 seq_printf(s, "]\n");
         }
+        for (n = rb_first(&map->primary_temp); n; n = rb_next(n)) {
+                struct ceph_pg_mapping *pg =
+                        rb_entry(n, struct ceph_pg_mapping, node);
+
+                seq_printf(s, "primary_temp %llu.%x %d\n", pg->pgid.pool,
+                           pg->pgid.seed, pg->primary_temp.osd);
+        }
 
         return 0;
 }