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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 "librbd/object_map/SnapshotRollbackRequest.h" | |
5 | #include "common/dout.h" | |
6 | #include "librbd/ImageCtx.h" | |
7 | #include "librbd/ObjectMap.h" | |
8 | #include "librbd/object_map/InvalidateRequest.h" | |
9 | #include "cls/lock/cls_lock_client.h" | |
10 | #include <iostream> | |
11 | ||
12 | #define dout_subsys ceph_subsys_rbd | |
13 | #undef dout_prefix | |
14 | #define dout_prefix *_dout << "librbd::object_map::SnapshotRollbackRequest: " | |
15 | ||
16 | namespace librbd { | |
17 | namespace object_map { | |
18 | ||
19 | namespace { | |
20 | ||
21 | std::ostream& operator<<(std::ostream& os, | |
22 | const SnapshotRollbackRequest::State& state) { | |
23 | switch(state) { | |
24 | case SnapshotRollbackRequest::STATE_READ_MAP: | |
25 | os << "READ_MAP"; | |
26 | break; | |
27 | case SnapshotRollbackRequest::STATE_INVALIDATE_MAP: | |
28 | os << "INVALIDATE_MAP"; | |
29 | break; | |
30 | case SnapshotRollbackRequest::STATE_WRITE_MAP: | |
31 | os << "WRITE_MAP"; | |
32 | break; | |
33 | default: | |
34 | os << "UNKNOWN (" << static_cast<uint32_t>(state) << ")"; | |
35 | break; | |
36 | } | |
37 | return os; | |
38 | } | |
39 | ||
40 | } // anonymous namespace | |
41 | ||
42 | void SnapshotRollbackRequest::send() { | |
43 | send_read_map(); | |
44 | } | |
45 | ||
46 | bool SnapshotRollbackRequest::should_complete(int r) { | |
47 | CephContext *cct = m_image_ctx.cct; | |
48 | ldout(cct, 5) << this << " " << __func__ << ": state=" << m_state << ", " | |
49 | << "r=" << r << dendl; | |
50 | if (r < 0 && m_ret_val == 0) { | |
51 | m_ret_val = r; | |
52 | } | |
53 | ||
54 | bool finished = false; | |
55 | switch (m_state) { | |
56 | case STATE_READ_MAP: | |
57 | if (r < 0) { | |
58 | // invalidate the snapshot object map | |
59 | send_invalidate_map(); | |
60 | } else { | |
61 | send_write_map(); | |
62 | } | |
63 | break; | |
64 | case STATE_INVALIDATE_MAP: | |
65 | // invalidate the HEAD object map as well | |
66 | finished = Request::should_complete(m_ret_val); | |
67 | break; | |
68 | case STATE_WRITE_MAP: | |
69 | finished = Request::should_complete(r); | |
70 | break; | |
71 | default: | |
11fdf7f2 | 72 | ceph_abort(); |
7c673cae FG |
73 | break; |
74 | } | |
75 | return finished; | |
76 | } | |
77 | ||
78 | void SnapshotRollbackRequest::send_read_map() { | |
79 | std::string snap_oid(ObjectMap<>::object_map_name(m_image_ctx.id, m_snap_id)); | |
80 | ||
81 | CephContext *cct = m_image_ctx.cct; | |
82 | ldout(cct, 5) << this << " " << __func__ << ": snap_oid=" << snap_oid | |
83 | << dendl; | |
84 | m_state = STATE_READ_MAP; | |
85 | ||
86 | librados::ObjectReadOperation op; | |
87 | op.read(0, 0, NULL, NULL); | |
88 | ||
89 | librados::AioCompletion *rados_completion = create_callback_completion(); | |
90 | int r = m_image_ctx.md_ctx.aio_operate(snap_oid, rados_completion, &op, | |
91 | &m_read_bl); | |
11fdf7f2 | 92 | ceph_assert(r == 0); |
7c673cae FG |
93 | rados_completion->release(); |
94 | } | |
95 | ||
96 | void SnapshotRollbackRequest::send_write_map() { | |
97 | RWLock::RLocker owner_locker(m_image_ctx.owner_lock); | |
98 | ||
99 | CephContext *cct = m_image_ctx.cct; | |
100 | std::string snap_oid(ObjectMap<>::object_map_name(m_image_ctx.id, | |
101 | CEPH_NOSNAP)); | |
102 | ldout(cct, 5) << this << " " << __func__ << ": snap_oid=" << snap_oid | |
103 | << dendl; | |
104 | m_state = STATE_WRITE_MAP; | |
105 | ||
106 | librados::ObjectWriteOperation op; | |
107 | rados::cls::lock::assert_locked(&op, RBD_LOCK_NAME, LOCK_EXCLUSIVE, "", ""); | |
108 | op.write_full(m_read_bl); | |
109 | ||
110 | librados::AioCompletion *rados_completion = create_callback_completion(); | |
111 | int r = m_image_ctx.md_ctx.aio_operate(snap_oid, rados_completion, &op); | |
11fdf7f2 | 112 | ceph_assert(r == 0); |
7c673cae FG |
113 | rados_completion->release(); |
114 | } | |
115 | ||
116 | void SnapshotRollbackRequest::send_invalidate_map() { | |
117 | RWLock::RLocker owner_locker(m_image_ctx.owner_lock); | |
118 | RWLock::WLocker snap_locker(m_image_ctx.snap_lock); | |
119 | ||
120 | CephContext *cct = m_image_ctx.cct; | |
121 | ldout(cct, 5) << this << " " << __func__ << dendl; | |
122 | m_state = STATE_INVALIDATE_MAP; | |
123 | ||
124 | InvalidateRequest<> *req = new InvalidateRequest<>(m_image_ctx, m_snap_id, | |
125 | false, | |
126 | create_callback_context()); | |
127 | req->send(); | |
128 | } | |
129 | ||
130 | } // namespace object_map | |
131 | } // namespace librbd |