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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/mirror/snapshot/RemoveImageStateRequest.h" | |
5 | #include "common/dout.h" | |
6 | #include "common/errno.h" | |
7 | #include "librbd/ImageCtx.h" | |
8 | #include "librbd/Utils.h" | |
9 | #include "librbd/mirror/snapshot/Types.h" | |
10 | #include "librbd/mirror/snapshot/Utils.h" | |
11 | ||
12 | #define dout_subsys ceph_subsys_rbd | |
13 | ||
14 | #undef dout_prefix | |
15 | #define dout_prefix *_dout << "librbd::mirror::snapshot::RemoveImageStateRequest: " \ | |
16 | << this << " " << __func__ << ": " | |
17 | ||
18 | namespace librbd { | |
19 | namespace mirror { | |
20 | namespace snapshot { | |
21 | ||
22 | using librbd::util::create_rados_callback; | |
23 | ||
24 | template <typename I> | |
25 | void RemoveImageStateRequest<I>::send() { | |
26 | get_object_count(); | |
27 | } | |
28 | ||
29 | ||
30 | template <typename I> | |
31 | void RemoveImageStateRequest<I>::get_object_count() { | |
32 | CephContext *cct = m_image_ctx->cct; | |
33 | ||
34 | auto oid = util::image_state_object_name(m_image_ctx, m_snap_id, 0); | |
f67539c2 | 35 | ldout(cct, 15) << oid << dendl; |
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36 | |
37 | librados::ObjectReadOperation op; | |
38 | op.read(0, 0, &m_bl, nullptr); | |
39 | ||
40 | librados::AioCompletion *comp = create_rados_callback< | |
41 | RemoveImageStateRequest<I>, | |
42 | &RemoveImageStateRequest<I>::handle_get_object_count>(this); | |
43 | int r = m_image_ctx->md_ctx.aio_operate(oid, comp, &op, nullptr); | |
44 | ceph_assert(r == 0); | |
45 | comp->release(); | |
46 | } | |
47 | ||
48 | template <typename I> | |
49 | void RemoveImageStateRequest<I>::handle_get_object_count(int r) { | |
50 | CephContext *cct = m_image_ctx->cct; | |
f67539c2 | 51 | ldout(cct, 15) << "r=" << r << dendl; |
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52 | |
53 | if (r < 0) { | |
54 | lderr(cct) << "failed to read image state object: " << cpp_strerror(r) | |
55 | << dendl; | |
56 | finish(r); | |
57 | return; | |
58 | } | |
59 | ||
60 | ImageStateHeader header(1); | |
61 | auto iter = m_bl.cbegin(); | |
62 | try { | |
63 | using ceph::decode; | |
64 | ||
65 | decode(header, iter); | |
66 | } catch (const buffer::error &err) { | |
67 | lderr(cct) << "failed to decode image state object header" << dendl; | |
68 | // still try to remove it | |
69 | } | |
70 | ||
71 | m_object_count = header.object_count > 0 ? header.object_count : 1; | |
72 | ||
73 | remove_object(); | |
74 | } | |
75 | ||
76 | template <typename I> | |
77 | void RemoveImageStateRequest<I>::remove_object() { | |
78 | CephContext *cct = m_image_ctx->cct; | |
79 | ||
80 | ceph_assert(m_object_count > 0); | |
81 | m_object_count--; | |
82 | ||
83 | auto oid = util::image_state_object_name(m_image_ctx, m_snap_id, | |
84 | m_object_count); | |
f67539c2 | 85 | ldout(cct, 15) << oid << dendl; |
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86 | |
87 | librados::ObjectWriteOperation op; | |
88 | op.remove(); | |
89 | ||
90 | librados::AioCompletion *comp = create_rados_callback< | |
91 | RemoveImageStateRequest<I>, | |
92 | &RemoveImageStateRequest<I>::handle_remove_object>(this); | |
93 | int r = m_image_ctx->md_ctx.aio_operate(oid, comp, &op); | |
94 | ceph_assert(r == 0); | |
95 | comp->release(); | |
96 | } | |
97 | ||
98 | template <typename I> | |
99 | void RemoveImageStateRequest<I>::handle_remove_object(int r) { | |
100 | CephContext *cct = m_image_ctx->cct; | |
f67539c2 | 101 | ldout(cct, 15) << "r=" << r << dendl; |
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102 | |
103 | if (r < 0 && r != -ENOENT) { | |
104 | lderr(cct) << "failed to remove image state object: " << cpp_strerror(r) | |
105 | << dendl; | |
106 | finish(r); | |
107 | return; | |
108 | } | |
109 | ||
110 | if (m_object_count == 0) { | |
111 | finish(0); | |
112 | return; | |
113 | } | |
114 | ||
115 | remove_object(); | |
116 | } | |
117 | ||
118 | template <typename I> | |
119 | void RemoveImageStateRequest<I>::finish(int r) { | |
120 | CephContext *cct = m_image_ctx->cct; | |
f67539c2 | 121 | ldout(cct, 15) << "r=" << r << dendl; |
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122 | |
123 | m_on_finish->complete(r); | |
124 | delete this; | |
125 | } | |
126 | ||
127 | } // namespace snapshot | |
128 | } // namespace mirror | |
129 | } // namespace librbd | |
130 | ||
131 | template class librbd::mirror::snapshot::RemoveImageStateRequest<librbd::ImageCtx>; |