[PATCH 19/33] libceph: primary_temp infrastructure

[Ilya Dryomov]

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.dryo...@inktank.com>
---
 include/linux/ceph/osdmap.h |    5 +++++
 net/ceph/debugfs.c          |    7 +++++++
 net/ceph/osdmap.c           |   10 +++++++++-
 3 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/include/linux/ceph/osdmap.h b/include/linux/ceph/osdmap.h
index 4837e58e3203..db4fb6322aae 100644
--- a/include/linux/ceph/osdmap.h
+++ b/include/linux/ceph/osdmap.h
@@ -66,6 +66,9 @@ struct ceph_pg_mapping {
                        int len;
                        int osds[];
                } pg_temp;
+               struct {
+                       int osd;
+               } primary_temp;
        };
 };
 
@@ -83,6 +86,8 @@ struct ceph_osdmap {
        struct ceph_entity_addr *osd_addr;
 
        struct rb_root pg_temp;
+       struct rb_root primary_temp;
+
        struct rb_root pg_pools;
        u32 pool_max;
 
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;
 }
diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c
index 401af78ad741..d78c3e5d60f7 100644
--- a/net/ceph/osdmap.c
+++ b/net/ceph/osdmap.c
@@ -343,7 +343,7 @@ bad:
 
 /*
  * rbtree of pg_mapping for handling pg_temp (explicit mapping of pgid
- * to a set of osds)
+ * to a set of osds) and primary_temp (explicit primary setting)
  */
 static int pgid_cmp(struct ceph_pg l, struct ceph_pg r)
 {
@@ -633,6 +633,13 @@ void ceph_osdmap_destroy(struct ceph_osdmap *map)
                rb_erase(&pg->node, &map->pg_temp);
                kfree(pg);
        }
+       while (!RB_EMPTY_ROOT(&map->primary_temp)) {
+               struct ceph_pg_mapping *pg =
+                       rb_entry(rb_first(&map->primary_temp),
+                                struct ceph_pg_mapping, node);
+               rb_erase(&pg->node, &map->primary_temp);
+               kfree(pg);
+       }
        while (!RB_EMPTY_ROOT(&map->pg_pools)) {
                struct ceph_pg_pool_info *pi =
                        rb_entry(rb_first(&map->pg_pools),
@@ -960,6 +967,7 @@ struct ceph_osdmap *ceph_osdmap_decode(void **p, void *end)
                return ERR_PTR(-ENOMEM);
 
        map->pg_temp = RB_ROOT;
+       map->primary_temp = RB_ROOT;
        mutex_init(&map->crush_scratch_mutex);
 
        ret = osdmap_decode(p, end, map);
-- 
1.7.10.4

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