1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
2 // vim: ts=8 sw=2 smarttab
4 #include "librbd/exclusive_lock/PostAcquireRequest.h"
5 #include "cls/lock/cls_lock_client.h"
6 #include "cls/lock/cls_lock_types.h"
7 #include "common/dout.h"
8 #include "common/errno.h"
9 #include "common/WorkQueue.h"
10 #include "include/stringify.h"
11 #include "librbd/ExclusiveLock.h"
12 #include "librbd/ImageCtx.h"
13 #include "librbd/ImageState.h"
14 #include "librbd/ImageWatcher.h"
15 #include "librbd/Journal.h"
16 #include "librbd/ObjectMap.h"
17 #include "librbd/Utils.h"
18 #include "librbd/image/RefreshRequest.h"
19 #include "librbd/journal/Policy.h"
21 #define dout_subsys ceph_subsys_rbd
23 #define dout_prefix *_dout << "librbd::exclusive_lock::PostAcquireRequest: " \
24 << this << " " << __func__ << ": "
27 namespace exclusive_lock {
29 using util::create_async_context_callback;
30 using util::create_context_callback;
31 using util::create_rados_callback;
34 PostAcquireRequest<I>* PostAcquireRequest<I>::create(I &image_ctx,
37 return new PostAcquireRequest(image_ctx, on_acquire, on_finish);
41 PostAcquireRequest<I>::PostAcquireRequest(I &image_ctx, Context *on_acquire,
43 : m_image_ctx(image_ctx),
44 m_on_acquire(on_acquire),
45 m_on_finish(create_async_context_callback(image_ctx, on_finish)),
46 m_object_map(nullptr), m_journal(nullptr), m_error_result(0) {
50 PostAcquireRequest<I>::~PostAcquireRequest() {
51 if (!m_prepare_lock_completed) {
52 m_image_ctx.state->handle_prepare_lock_complete();
58 void PostAcquireRequest<I>::send() {
63 void PostAcquireRequest<I>::send_refresh() {
64 if (!m_image_ctx.state->is_refresh_required()) {
65 send_open_object_map();
69 CephContext *cct = m_image_ctx.cct;
70 ldout(cct, 10) << dendl;
72 using klass = PostAcquireRequest<I>;
73 Context *ctx = create_async_context_callback(
74 m_image_ctx, create_context_callback<klass, &klass::handle_refresh>(this));
76 // ImageState is blocked waiting for lock to complete -- safe to directly
78 image::RefreshRequest<I> *req = image::RefreshRequest<I>::create(
79 m_image_ctx, true, false, ctx);
84 void PostAcquireRequest<I>::handle_refresh(int r) {
85 CephContext *cct = m_image_ctx.cct;
86 ldout(cct, 10) << "r=" << r << dendl;
89 // next issued IO or op will (re)-refresh the image and shut down lock
90 ldout(cct, 5) << "exclusive lock dynamically disabled" << dendl;
93 lderr(cct) << "failed to refresh image: " << cpp_strerror(r) << dendl;
100 send_open_object_map();
103 template <typename I>
104 void PostAcquireRequest<I>::send_open_journal() {
105 // alert caller that we now own the exclusive lock
106 m_on_acquire->complete(0);
107 m_on_acquire = nullptr;
109 bool journal_enabled;
111 RWLock::RLocker snap_locker(m_image_ctx.snap_lock);
112 journal_enabled = (m_image_ctx.test_features(RBD_FEATURE_JOURNALING,
113 m_image_ctx.snap_lock) &&
114 !m_image_ctx.get_journal_policy()->journal_disabled());
116 if (!journal_enabled) {
122 CephContext *cct = m_image_ctx.cct;
123 ldout(cct, 10) << dendl;
125 using klass = PostAcquireRequest<I>;
126 Context *ctx = create_context_callback<klass, &klass::handle_open_journal>(
128 m_journal = m_image_ctx.create_journal();
130 // journal playback requires object map (if enabled) and itself
133 m_journal->open(ctx);
136 template <typename I>
137 void PostAcquireRequest<I>::handle_open_journal(int r) {
138 CephContext *cct = m_image_ctx.cct;
139 ldout(cct, 10) << "r=" << r << dendl;
143 lderr(cct) << "failed to open journal: " << cpp_strerror(r) << dendl;
144 send_close_journal();
148 send_allocate_journal_tag();
151 template <typename I>
152 void PostAcquireRequest<I>::send_allocate_journal_tag() {
153 CephContext *cct = m_image_ctx.cct;
154 ldout(cct, 10) << dendl;
156 RWLock::RLocker snap_locker(m_image_ctx.snap_lock);
157 using klass = PostAcquireRequest<I>;
158 Context *ctx = create_context_callback<
159 klass, &klass::handle_allocate_journal_tag>(this);
160 m_image_ctx.get_journal_policy()->allocate_tag_on_lock(ctx);
163 template <typename I>
164 void PostAcquireRequest<I>::handle_allocate_journal_tag(int r) {
165 CephContext *cct = m_image_ctx.cct;
166 ldout(cct, 10) << "r=" << r << dendl;
170 lderr(cct) << "failed to allocate journal tag: " << cpp_strerror(r)
172 send_close_journal();
179 template <typename I>
180 void PostAcquireRequest<I>::send_close_journal() {
181 CephContext *cct = m_image_ctx.cct;
182 ldout(cct, 10) << dendl;
184 using klass = PostAcquireRequest<I>;
185 Context *ctx = create_context_callback<klass, &klass::handle_close_journal>(
187 m_journal->close(ctx);
190 template <typename I>
191 void PostAcquireRequest<I>::handle_close_journal(int r) {
192 CephContext *cct = m_image_ctx.cct;
193 ldout(cct, 10) << "r=" << r << dendl;
197 lderr(cct) << "failed to close journal: " << cpp_strerror(r) << dendl;
200 send_close_object_map();
203 template <typename I>
204 void PostAcquireRequest<I>::send_open_object_map() {
205 if (!m_image_ctx.test_features(RBD_FEATURE_OBJECT_MAP)) {
210 CephContext *cct = m_image_ctx.cct;
211 ldout(cct, 10) << dendl;
213 using klass = PostAcquireRequest<I>;
214 Context *ctx = create_context_callback<klass, &klass::handle_open_object_map>(
217 m_object_map = m_image_ctx.create_object_map(CEPH_NOSNAP);
218 m_object_map->open(ctx);
221 template <typename I>
222 void PostAcquireRequest<I>::handle_open_object_map(int r) {
223 CephContext *cct = m_image_ctx.cct;
224 ldout(cct, 10) << "r=" << r << dendl;
227 lderr(cct) << "failed to open object map: " << cpp_strerror(r) << dendl;
231 m_object_map = nullptr;
237 template <typename I>
238 void PostAcquireRequest<I>::send_close_object_map() {
239 if (m_object_map == nullptr) {
245 CephContext *cct = m_image_ctx.cct;
246 ldout(cct, 10) << dendl;
248 using klass = PostAcquireRequest<I>;
249 Context *ctx = create_context_callback<
250 klass, &klass::handle_close_object_map>(this);
251 m_object_map->close(ctx);
254 template <typename I>
255 void PostAcquireRequest<I>::handle_close_object_map(int r) {
256 CephContext *cct = m_image_ctx.cct;
257 ldout(cct, 10) << "r=" << r << dendl;
259 // object map should never result in an error
265 template <typename I>
266 void PostAcquireRequest<I>::apply() {
268 RWLock::WLocker snap_locker(m_image_ctx.snap_lock);
269 assert(m_image_ctx.object_map == nullptr);
270 m_image_ctx.object_map = m_object_map;
272 assert(m_image_ctx.journal == nullptr);
273 m_image_ctx.journal = m_journal;
276 m_prepare_lock_completed = true;
277 m_image_ctx.state->handle_prepare_lock_complete();
280 template <typename I>
281 void PostAcquireRequest<I>::revert() {
282 RWLock::WLocker snap_locker(m_image_ctx.snap_lock);
283 m_image_ctx.object_map = nullptr;
284 m_image_ctx.journal = nullptr;
289 assert(m_error_result < 0);
292 template <typename I>
293 void PostAcquireRequest<I>::finish() {
294 m_on_finish->complete(m_error_result);
298 } // namespace exclusive_lock
299 } // namespace librbd
301 template class librbd::exclusive_lock::PostAcquireRequest<librbd::ImageCtx>;