]>
Commit | Line | Data |
---|---|---|
7c673cae FG |
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/operation/FlattenRequest.h" | |
5 | #include "librbd/AsyncObjectThrottle.h" | |
6 | #include "librbd/ExclusiveLock.h" | |
7 | #include "librbd/ImageCtx.h" | |
11fdf7f2 TL |
8 | #include "librbd/image/DetachChildRequest.h" |
9 | #include "librbd/image/DetachParentRequest.h" | |
10 | #include "librbd/Types.h" | |
7c673cae FG |
11 | #include "librbd/io/ObjectRequest.h" |
12 | #include "common/dout.h" | |
13 | #include "common/errno.h" | |
14 | #include <boost/lambda/bind.hpp> | |
15 | #include <boost/lambda/construct.hpp> | |
16 | ||
17 | #define dout_subsys ceph_subsys_rbd | |
18 | #undef dout_prefix | |
11fdf7f2 TL |
19 | #define dout_prefix *_dout << "librbd::operation::FlattenRequest: " << this \ |
20 | << " " << __func__ << ": " | |
7c673cae FG |
21 | |
22 | namespace librbd { | |
23 | namespace operation { | |
24 | ||
11fdf7f2 TL |
25 | using util::create_context_callback; |
26 | using util::create_rados_callback; | |
27 | ||
7c673cae FG |
28 | template <typename I> |
29 | class C_FlattenObject : public C_AsyncObjectThrottle<I> { | |
30 | public: | |
31 | C_FlattenObject(AsyncObjectThrottle<I> &throttle, I *image_ctx, | |
11fdf7f2 TL |
32 | ::SnapContext snapc, uint64_t object_no) |
33 | : C_AsyncObjectThrottle<I>(throttle, *image_ctx), m_snapc(snapc), | |
34 | m_object_no(object_no) { | |
7c673cae FG |
35 | } |
36 | ||
37 | int send() override { | |
38 | I &image_ctx = this->m_image_ctx; | |
9f95a23c | 39 | ceph_assert(ceph_mutex_is_locked(image_ctx.owner_lock)); |
7c673cae FG |
40 | CephContext *cct = image_ctx.cct; |
41 | ||
42 | if (image_ctx.exclusive_lock != nullptr && | |
43 | !image_ctx.exclusive_lock->is_lock_owner()) { | |
44 | ldout(cct, 1) << "lost exclusive lock during flatten" << dendl; | |
45 | return -ERESTART; | |
46 | } | |
47 | ||
11fdf7f2 | 48 | { |
9f95a23c | 49 | std::shared_lock image_lock{image_ctx.image_lock}; |
11fdf7f2 TL |
50 | if (image_ctx.object_map != nullptr && |
51 | !image_ctx.object_map->object_may_not_exist(m_object_no)) { | |
52 | // can skip because the object already exists | |
53 | return 1; | |
54 | } | |
55 | } | |
56 | ||
7c673cae | 57 | bufferlist bl; |
9f95a23c | 58 | auto req = new io::ObjectWriteRequest<I>(&image_ctx, m_object_no, 0, |
11fdf7f2 TL |
59 | std::move(bl), m_snapc, 0, {}, |
60 | this); | |
7c673cae FG |
61 | if (!req->has_parent()) { |
62 | // stop early if the parent went away - it just means | |
63 | // another flatten finished first or the image was resized | |
64 | delete req; | |
65 | return 1; | |
66 | } | |
67 | ||
68 | req->send(); | |
69 | return 0; | |
70 | } | |
71 | ||
72 | private: | |
7c673cae FG |
73 | ::SnapContext m_snapc; |
74 | uint64_t m_object_no; | |
75 | }; | |
76 | ||
77 | template <typename I> | |
78 | bool FlattenRequest<I>::should_complete(int r) { | |
79 | I &image_ctx = this->m_image_ctx; | |
80 | CephContext *cct = image_ctx.cct; | |
11fdf7f2 TL |
81 | ldout(cct, 5) << "r=" << r << dendl; |
82 | if (r < 0) { | |
83 | lderr(cct) << "encountered error: " << cpp_strerror(r) << dendl; | |
7c673cae | 84 | } |
11fdf7f2 | 85 | return true; |
7c673cae FG |
86 | } |
87 | ||
88 | template <typename I> | |
89 | void FlattenRequest<I>::send_op() { | |
11fdf7f2 TL |
90 | flatten_objects(); |
91 | } | |
92 | ||
93 | template <typename I> | |
94 | void FlattenRequest<I>::flatten_objects() { | |
7c673cae | 95 | I &image_ctx = this->m_image_ctx; |
9f95a23c | 96 | ceph_assert(ceph_mutex_is_locked(image_ctx.owner_lock)); |
11fdf7f2 | 97 | |
7c673cae | 98 | CephContext *cct = image_ctx.cct; |
11fdf7f2 | 99 | ldout(cct, 5) << dendl; |
7c673cae | 100 | |
9f95a23c | 101 | assert(ceph_mutex_is_locked(image_ctx.owner_lock)); |
11fdf7f2 TL |
102 | auto ctx = create_context_callback< |
103 | FlattenRequest<I>, | |
104 | &FlattenRequest<I>::handle_flatten_objects>(this); | |
7c673cae FG |
105 | typename AsyncObjectThrottle<I>::ContextFactory context_factory( |
106 | boost::lambda::bind(boost::lambda::new_ptr<C_FlattenObject<I> >(), | |
11fdf7f2 | 107 | boost::lambda::_1, &image_ctx, m_snapc, boost::lambda::_2)); |
7c673cae | 108 | AsyncObjectThrottle<I> *throttle = new AsyncObjectThrottle<I>( |
11fdf7f2 TL |
109 | this, image_ctx, context_factory, ctx, &m_prog_ctx, 0, m_overlap_objects); |
110 | throttle->start_ops( | |
111 | image_ctx.config.template get_val<uint64_t>("rbd_concurrent_management_ops")); | |
7c673cae FG |
112 | } |
113 | ||
114 | template <typename I> | |
11fdf7f2 | 115 | void FlattenRequest<I>::handle_flatten_objects(int r) { |
7c673cae | 116 | I &image_ctx = this->m_image_ctx; |
7c673cae | 117 | CephContext *cct = image_ctx.cct; |
11fdf7f2 | 118 | ldout(cct, 5) << "r=" << r << dendl; |
7c673cae | 119 | |
11fdf7f2 TL |
120 | if (r == -ERESTART) { |
121 | ldout(cct, 5) << "flatten operation interrupted" << dendl; | |
122 | this->complete(r); | |
123 | return; | |
124 | } else if (r < 0) { | |
125 | lderr(cct) << "flatten encountered an error: " << cpp_strerror(r) << dendl; | |
126 | this->complete(r); | |
127 | return; | |
7c673cae | 128 | } |
7c673cae | 129 | |
11fdf7f2 | 130 | detach_child(); |
7c673cae FG |
131 | } |
132 | ||
133 | template <typename I> | |
11fdf7f2 | 134 | void FlattenRequest<I>::detach_child() { |
7c673cae | 135 | I &image_ctx = this->m_image_ctx; |
7c673cae FG |
136 | CephContext *cct = image_ctx.cct; |
137 | ||
138 | // should have been canceled prior to releasing lock | |
9f95a23c | 139 | image_ctx.owner_lock.lock_shared(); |
11fdf7f2 TL |
140 | ceph_assert(image_ctx.exclusive_lock == nullptr || |
141 | image_ctx.exclusive_lock->is_lock_owner()); | |
7c673cae FG |
142 | |
143 | // if there are no snaps, remove from the children object as well | |
144 | // (if snapshots remain, they have their own parent info, and the child | |
145 | // will be removed when the last snap goes away) | |
9f95a23c | 146 | image_ctx.image_lock.lock_shared(); |
7c673cae FG |
147 | if ((image_ctx.features & RBD_FEATURE_DEEP_FLATTEN) == 0 && |
148 | !image_ctx.snaps.empty()) { | |
9f95a23c TL |
149 | image_ctx.image_lock.unlock_shared(); |
150 | image_ctx.owner_lock.unlock_shared(); | |
11fdf7f2 TL |
151 | detach_parent(); |
152 | return; | |
153 | } | |
9f95a23c | 154 | image_ctx.image_lock.unlock_shared(); |
11fdf7f2 TL |
155 | |
156 | ldout(cct, 5) << dendl; | |
157 | auto ctx = create_context_callback< | |
158 | FlattenRequest<I>, | |
159 | &FlattenRequest<I>::handle_detach_child>(this); | |
160 | auto req = image::DetachChildRequest<I>::create(image_ctx, ctx); | |
161 | req->send(); | |
9f95a23c | 162 | image_ctx.owner_lock.unlock_shared(); |
11fdf7f2 TL |
163 | } |
164 | ||
165 | template <typename I> | |
166 | void FlattenRequest<I>::handle_detach_child(int r) { | |
167 | I &image_ctx = this->m_image_ctx; | |
168 | CephContext *cct = image_ctx.cct; | |
169 | ldout(cct, 5) << "r=" << r << dendl; | |
170 | ||
171 | if (r < 0 && r != -ENOENT) { | |
172 | lderr(cct) << "detach encountered an error: " << cpp_strerror(r) << dendl; | |
173 | this->complete(r); | |
174 | return; | |
175 | } | |
176 | ||
177 | detach_parent(); | |
178 | } | |
179 | ||
180 | template <typename I> | |
181 | void FlattenRequest<I>::detach_parent() { | |
182 | I &image_ctx = this->m_image_ctx; | |
183 | CephContext *cct = image_ctx.cct; | |
184 | ldout(cct, 5) << dendl; | |
185 | ||
186 | // should have been canceled prior to releasing lock | |
9f95a23c | 187 | image_ctx.owner_lock.lock_shared(); |
11fdf7f2 TL |
188 | ceph_assert(image_ctx.exclusive_lock == nullptr || |
189 | image_ctx.exclusive_lock->is_lock_owner()); | |
190 | ||
191 | // stop early if the parent went away - it just means | |
192 | // another flatten finished first, so this one is useless. | |
9f95a23c | 193 | image_ctx.image_lock.lock_shared(); |
11fdf7f2 TL |
194 | if (!image_ctx.parent) { |
195 | ldout(cct, 5) << "image already flattened" << dendl; | |
9f95a23c TL |
196 | image_ctx.image_lock.unlock_shared(); |
197 | image_ctx.owner_lock.unlock_shared(); | |
11fdf7f2 TL |
198 | this->complete(0); |
199 | return; | |
7c673cae | 200 | } |
9f95a23c | 201 | image_ctx.image_lock.unlock_shared(); |
11fdf7f2 TL |
202 | |
203 | // remove parent from this (base) image | |
204 | auto ctx = create_context_callback< | |
205 | FlattenRequest<I>, | |
206 | &FlattenRequest<I>::handle_detach_parent>(this); | |
207 | auto req = image::DetachParentRequest<I>::create(image_ctx, ctx); | |
208 | req->send(); | |
9f95a23c | 209 | image_ctx.owner_lock.unlock_shared(); |
11fdf7f2 | 210 | } |
7c673cae | 211 | |
11fdf7f2 TL |
212 | template <typename I> |
213 | void FlattenRequest<I>::handle_detach_parent(int r) { | |
214 | I &image_ctx = this->m_image_ctx; | |
215 | CephContext *cct = image_ctx.cct; | |
216 | ldout(cct, 5) << "r=" << r << dendl; | |
7c673cae | 217 | |
11fdf7f2 TL |
218 | if (r < 0) { |
219 | lderr(cct) << "remove parent encountered an error: " << cpp_strerror(r) | |
220 | << dendl; | |
221 | } | |
7c673cae | 222 | |
11fdf7f2 | 223 | this->complete(r); |
7c673cae FG |
224 | } |
225 | ||
226 | } // namespace operation | |
227 | } // namespace librbd | |
228 | ||
229 | template class librbd::operation::FlattenRequest<librbd::ImageCtx>; |