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1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- |
2 | // vim: ts=8 sw=2 smarttab | |
3 | ||
4 | #include "ClusterWatcher.h" | |
5 | #include "common/debug.h" | |
6 | #include "common/errno.h" | |
7 | #include "librbd/internal.h" | |
8 | #include "librbd/api/Mirror.h" | |
9 | ||
10 | #define dout_context g_ceph_context | |
11 | #define dout_subsys ceph_subsys_rbd_mirror | |
12 | #undef dout_prefix | |
13 | #define dout_prefix *_dout << "rbd::mirror::ClusterWatcher:" << this << " " \ | |
14 | << __func__ << ": " | |
15 | ||
16 | using std::list; | |
17 | using std::map; | |
18 | using std::set; | |
19 | using std::string; | |
20 | using std::unique_ptr; | |
21 | using std::vector; | |
22 | ||
23 | using librados::Rados; | |
24 | using librados::IoCtx; | |
25 | ||
26 | namespace rbd { | |
27 | namespace mirror { | |
28 | ||
29 | ClusterWatcher::ClusterWatcher(RadosRef cluster, Mutex &lock) : | |
30 | m_lock(lock), | |
31 | m_cluster(cluster) | |
32 | { | |
33 | } | |
34 | ||
35 | const ClusterWatcher::PoolPeers& ClusterWatcher::get_pool_peers() const | |
36 | { | |
37 | assert(m_lock.is_locked()); | |
38 | return m_pool_peers; | |
39 | } | |
40 | ||
41 | void ClusterWatcher::refresh_pools() | |
42 | { | |
43 | dout(20) << "enter" << dendl; | |
44 | ||
45 | PoolPeers pool_peers; | |
46 | PoolNames pool_names; | |
47 | read_pool_peers(&pool_peers, &pool_names); | |
48 | ||
49 | Mutex::Locker l(m_lock); | |
50 | m_pool_peers = pool_peers; | |
51 | // TODO: perhaps use a workqueue instead, once we get notifications | |
52 | // about config changes for existing pools | |
53 | } | |
54 | ||
55 | void ClusterWatcher::read_pool_peers(PoolPeers *pool_peers, | |
56 | PoolNames *pool_names) | |
57 | { | |
58 | list<pair<int64_t, string> > pools; | |
59 | int r = m_cluster->pool_list2(pools); | |
60 | if (r < 0) { | |
61 | derr << "error listing pools: " << cpp_strerror(r) << dendl; | |
62 | return; | |
63 | } | |
64 | ||
65 | for (auto kv : pools) { | |
66 | int64_t pool_id = kv.first; | |
67 | string pool_name = kv.second; | |
68 | int64_t base_tier; | |
69 | r = m_cluster->pool_get_base_tier(pool_id, &base_tier); | |
70 | if (r == -ENOENT) { | |
71 | dout(10) << "pool " << pool_name << " no longer exists" << dendl; | |
72 | continue; | |
73 | } else if (r < 0) { | |
74 | derr << "Error retrieving base tier for pool " << pool_name << dendl; | |
75 | continue; | |
76 | } | |
77 | if (pool_id != base_tier) { | |
78 | // pool is a cache; skip it | |
79 | continue; | |
80 | } | |
81 | ||
82 | IoCtx ioctx; | |
83 | r = m_cluster->ioctx_create2(pool_id, ioctx); | |
84 | if (r == -ENOENT) { | |
85 | dout(10) << "pool " << pool_id << " no longer exists" << dendl; | |
86 | continue; | |
87 | } else if (r < 0) { | |
88 | derr << "Error accessing pool " << pool_name << cpp_strerror(r) << dendl; | |
89 | continue; | |
90 | } | |
91 | ||
92 | rbd_mirror_mode_t mirror_mode; | |
93 | r = librbd::api::Mirror<>::mode_get(ioctx, &mirror_mode); | |
94 | if (r < 0) { | |
95 | derr << "could not tell whether mirroring was enabled for " << pool_name | |
96 | << " : " << cpp_strerror(r) << dendl; | |
97 | continue; | |
98 | } | |
99 | if (mirror_mode == RBD_MIRROR_MODE_DISABLED) { | |
100 | dout(10) << "mirroring is disabled for pool " << pool_name << dendl; | |
101 | continue; | |
102 | } | |
103 | ||
104 | vector<librbd::mirror_peer_t> configs; | |
105 | r = librbd::api::Mirror<>::peer_list(ioctx, &configs); | |
106 | if (r < 0) { | |
107 | derr << "error reading mirroring config for pool " << pool_name | |
108 | << cpp_strerror(r) << dendl; | |
109 | continue; | |
110 | } | |
111 | ||
112 | pool_peers->insert({pool_id, Peers{configs.begin(), configs.end()}}); | |
113 | pool_names->insert(pool_name); | |
114 | } | |
115 | } | |
116 | ||
117 | } // namespace mirror | |
118 | } // namespace rbd |