Fix some bugs when testing opensds ansible
[stor4nfv.git] / src / ceph / src / librbd / ImageCtx.h
1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
2 // vim: ts=8 sw=2 smarttab
3 #ifndef CEPH_LIBRBD_IMAGECTX_H
4 #define CEPH_LIBRBD_IMAGECTX_H
5
6 #include "include/int_types.h"
7
8 #include <list>
9 #include <map>
10 #include <string>
11 #include <vector>
12
13 #include "common/event_socket.h"
14 #include "common/Mutex.h"
15 #include "common/Readahead.h"
16 #include "common/RWLock.h"
17 #include "common/snap_types.h"
18 #include "common/zipkin_trace.h"
19
20 #include "include/buffer_fwd.h"
21 #include "include/rbd/librbd.hpp"
22 #include "include/rbd_types.h"
23 #include "include/types.h"
24 #include "include/xlist.h"
25 #include "osdc/ObjectCacher.h"
26
27 #include "cls/rbd/cls_rbd_types.h"
28 #include "cls/rbd/cls_rbd_client.h"
29 #include "librbd/AsyncRequest.h"
30 #include "librbd/Types.h"
31
32 class CephContext;
33 class ContextWQ;
34 class Finisher;
35 class PerfCounters;
36 class ThreadPool;
37 class SafeTimer;
38
39 namespace librbd {
40
41   template <typename> class ExclusiveLock;
42   template <typename> class ImageState;
43   template <typename> class ImageWatcher;
44   template <typename> class Journal;
45   class LibrbdAdminSocketHook;
46   template <typename> class ObjectMap;
47   template <typename> class Operations;
48   class LibrbdWriteback;
49
50   namespace cache { struct ImageCache; }
51   namespace exclusive_lock { struct Policy; }
52   namespace io {
53   class AioCompletion;
54   class AsyncOperation;
55   template <typename> class ImageRequestWQ;
56   class CopyupRequest;
57   }
58   namespace journal { struct Policy; }
59
60   namespace operation {
61   template <typename> class ResizeRequest;
62   }
63
64   struct ImageCtx {
65     CephContext *cct;
66     PerfCounters *perfcounter;
67     struct rbd_obj_header_ondisk header;
68     ::SnapContext snapc;
69     std::vector<librados::snap_t> snaps; // this mirrors snapc.snaps, but is in
70                                         // a format librados can understand
71     std::map<librados::snap_t, SnapInfo> snap_info;
72     std::map<std::pair<cls::rbd::SnapshotNamespace, std::string>, librados::snap_t> snap_ids;
73     uint64_t snap_id;
74     bool snap_exists; // false if our snap_id was deleted
75     // whether the image was opened read-only. cannot be changed after opening
76     bool read_only;
77     bool flush_encountered;
78
79     std::map<rados::cls::lock::locker_id_t,
80              rados::cls::lock::locker_info_t> lockers;
81     bool exclusive_locked;
82     std::string lock_tag;
83
84     std::string name;
85     cls::rbd::SnapshotNamespace snap_namespace;
86     std::string snap_name;
87     IoCtx data_ctx, md_ctx;
88     ImageWatcher<ImageCtx> *image_watcher;
89     Journal<ImageCtx> *journal;
90
91     /**
92      * Lock ordering:
93      *
94      * owner_lock, md_lock, cache_lock, snap_lock, parent_lock,
95      * object_map_lock, async_op_lock
96      */
97     RWLock owner_lock; // protects exclusive lock leadership updates
98     RWLock md_lock; // protects access to the mutable image metadata that
99                    // isn't guarded by other locks below, and blocks writes
100                    // when held exclusively, so snapshots can be consistent.
101                    // Fields guarded include:
102                    // flush_encountered
103                    // total_bytes_read
104                    // exclusive_locked
105                    // lock_tag
106                    // lockers
107     Mutex cache_lock; // used as client_lock for the ObjectCacher
108     RWLock snap_lock; // protects snapshot-related member variables,
109                       // features (and associated helper classes), and flags
110     RWLock parent_lock; // protects parent_md and parent
111     RWLock object_map_lock; // protects object map updates and object_map itself
112     Mutex async_ops_lock; // protects async_ops and async_requests
113     Mutex copyup_list_lock; // protects copyup_waiting_list
114     Mutex completed_reqs_lock; // protects completed_reqs
115
116     unsigned extra_read_flags;
117
118     bool old_format;
119     uint8_t order;
120     uint64_t size;
121     uint64_t features;
122     std::string object_prefix;
123     char *format_string;
124     std::string header_oid;
125     std::string id; // only used for new-format images
126     ParentInfo parent_md;
127     ImageCtx *parent;
128     cls::rbd::GroupSpec group_spec;
129     uint64_t stripe_unit, stripe_count;
130     uint64_t flags;
131     utime_t create_timestamp;
132
133     file_layout_t layout;
134
135     cache::ImageCache *image_cache = nullptr;
136     ObjectCacher *object_cacher;
137     LibrbdWriteback *writeback_handler;
138     ObjectCacher::ObjectSet *object_set;
139
140     Readahead readahead;
141     uint64_t total_bytes_read;
142
143     std::map<uint64_t, io::CopyupRequest*> copyup_list;
144
145     xlist<io::AsyncOperation*> async_ops;
146     xlist<AsyncRequest<>*> async_requests;
147     std::list<Context*> async_requests_waiters;
148
149     ImageState<ImageCtx> *state;
150     Operations<ImageCtx> *operations;
151
152     ExclusiveLock<ImageCtx> *exclusive_lock;
153     ObjectMap<ImageCtx> *object_map;
154
155     xlist<operation::ResizeRequest<ImageCtx>*> resize_reqs;
156
157     io::ImageRequestWQ<ImageCtx> *io_work_queue;
158     xlist<io::AioCompletion*> completed_reqs;
159     EventSocket event_socket;
160
161     ContextWQ *op_work_queue;
162
163     // Configuration
164     static const string METADATA_CONF_PREFIX;
165     bool non_blocking_aio;
166     bool cache;
167     bool cache_writethrough_until_flush;
168     uint64_t cache_size;
169     uint64_t cache_max_dirty;
170     uint64_t cache_target_dirty;
171     double cache_max_dirty_age;
172     uint32_t cache_max_dirty_object;
173     bool cache_block_writes_upfront;
174     uint32_t concurrent_management_ops;
175     bool balance_snap_reads;
176     bool localize_snap_reads;
177     bool balance_parent_reads;
178     bool localize_parent_reads;
179     uint32_t readahead_trigger_requests;
180     uint64_t readahead_max_bytes;
181     uint64_t readahead_disable_after_bytes;
182     bool clone_copy_on_read;
183     bool blacklist_on_break_lock;
184     uint32_t blacklist_expire_seconds;
185     uint32_t request_timed_out_seconds;
186     bool enable_alloc_hint;
187     uint8_t journal_order;
188     uint8_t journal_splay_width;
189     double journal_commit_age;
190     int journal_object_flush_interval;
191     uint64_t journal_object_flush_bytes;
192     double journal_object_flush_age;
193     std::string journal_pool;
194     uint32_t journal_max_payload_bytes;
195     int journal_max_concurrent_object_sets;
196     bool mirroring_resync_after_disconnect;
197     int mirroring_replay_delay;
198     bool skip_partial_discard;
199     bool blkin_trace_all;
200
201     LibrbdAdminSocketHook *asok_hook;
202
203     exclusive_lock::Policy *exclusive_lock_policy = nullptr;
204     journal::Policy *journal_policy = nullptr;
205
206     ZTracer::Endpoint trace_endpoint;
207
208     static bool _filter_metadata_confs(const string &prefix, std::map<string, bool> &configs,
209                                        const map<string, bufferlist> &pairs, map<string, bufferlist> *res);
210
211     // unit test mock helpers
212     static ImageCtx* create(const std::string &image_name,
213                             const std::string &image_id,
214                             const char *snap, IoCtx& p, bool read_only) {
215       return new ImageCtx(image_name, image_id, snap, p, read_only);
216     }
217     void destroy() {
218       delete this;
219     }
220
221     /**
222      * Either image_name or image_id must be set.
223      * If id is not known, pass the empty std::string,
224      * and init() will look it up.
225      */
226     ImageCtx(const std::string &image_name, const std::string &image_id,
227              const char *snap, IoCtx& p, bool read_only);
228     ~ImageCtx();
229     void init();
230     void shutdown();
231     void init_layout();
232     void perf_start(std::string name);
233     void perf_stop();
234     void set_read_flag(unsigned flag);
235     int get_read_flags(librados::snap_t snap_id);
236     int snap_set(cls::rbd::SnapshotNamespace in_snap_namespace,
237                  std::string in_snap_name);
238     void snap_unset();
239     librados::snap_t get_snap_id(cls::rbd::SnapshotNamespace in_snap_namespace,
240                                  std::string in_snap_name) const;
241     const SnapInfo* get_snap_info(librados::snap_t in_snap_id) const;
242     int get_snap_name(librados::snap_t in_snap_id,
243                       std::string *out_snap_name) const;
244     int get_snap_namespace(librados::snap_t in_snap_id,
245                            cls::rbd::SnapshotNamespace *out_snap_namespace) const;
246     int get_parent_spec(librados::snap_t in_snap_id,
247                         ParentSpec *pspec) const;
248     int is_snap_protected(librados::snap_t in_snap_id,
249                           bool *is_protected) const;
250     int is_snap_unprotected(librados::snap_t in_snap_id,
251                             bool *is_unprotected) const;
252
253     uint64_t get_current_size() const;
254     uint64_t get_object_size() const;
255     string get_object_name(uint64_t num) const;
256     uint64_t get_stripe_unit() const;
257     uint64_t get_stripe_count() const;
258     uint64_t get_stripe_period() const;
259     utime_t get_create_timestamp() const;
260
261     void add_snap(cls::rbd::SnapshotNamespace in_snap_namespace,
262                   std::string in_snap_name,
263                   librados::snap_t id,
264                   uint64_t in_size, const ParentInfo &parent,
265                   uint8_t protection_status, uint64_t flags, utime_t timestamp);
266     void rm_snap(cls::rbd::SnapshotNamespace in_snap_namespace,
267                  std::string in_snap_name,
268                  librados::snap_t id);
269     uint64_t get_image_size(librados::snap_t in_snap_id) const;
270     uint64_t get_object_count(librados::snap_t in_snap_id) const;
271     bool test_features(uint64_t test_features) const;
272     bool test_features(uint64_t test_features,
273                        const RWLock &in_snap_lock) const;
274     int get_flags(librados::snap_t in_snap_id, uint64_t *flags) const;
275     int test_flags(uint64_t test_flags, bool *flags_set) const;
276     int test_flags(uint64_t test_flags, const RWLock &in_snap_lock,
277                    bool *flags_set) const;
278     int update_flags(librados::snap_t in_snap_id, uint64_t flag, bool enabled);
279
280     const ParentInfo* get_parent_info(librados::snap_t in_snap_id) const;
281     int64_t get_parent_pool_id(librados::snap_t in_snap_id) const;
282     std::string get_parent_image_id(librados::snap_t in_snap_id) const;
283     uint64_t get_parent_snap_id(librados::snap_t in_snap_id) const;
284     int get_parent_overlap(librados::snap_t in_snap_id,
285                            uint64_t *overlap) const;
286     void aio_read_from_cache(object_t o, uint64_t object_no, bufferlist *bl,
287                              size_t len, uint64_t off, Context *onfinish,
288                              int fadvise_flags, ZTracer::Trace *trace);
289     void write_to_cache(object_t o, const bufferlist& bl, size_t len,
290                         uint64_t off, Context *onfinish, int fadvise_flags,
291                         uint64_t journal_tid, ZTracer::Trace *trace);
292     void user_flushed();
293     void flush_cache(Context *onfinish);
294     void shut_down_cache(Context *on_finish);
295     int invalidate_cache(bool purge_on_error);
296     void invalidate_cache(bool purge_on_error, Context *on_finish);
297     void clear_nonexistence_cache();
298     bool is_cache_empty();
299     void register_watch(Context *on_finish);
300     uint64_t prune_parent_extents(vector<pair<uint64_t,uint64_t> >& objectx,
301                                   uint64_t overlap);
302
303     void flush_async_operations();
304     void flush_async_operations(Context *on_finish);
305
306     int flush();
307     void flush(Context *on_safe);
308
309     void cancel_async_requests();
310     void cancel_async_requests(Context *on_finish);
311
312     void apply_metadata(const std::map<std::string, bufferlist> &meta);
313
314     ExclusiveLock<ImageCtx> *create_exclusive_lock();
315     ObjectMap<ImageCtx> *create_object_map(uint64_t snap_id);
316     Journal<ImageCtx> *create_journal();
317
318     void clear_pending_completions();
319
320     void set_image_name(const std::string &name);
321
322     void notify_update();
323     void notify_update(Context *on_finish);
324
325     exclusive_lock::Policy *get_exclusive_lock_policy() const;
326     void set_exclusive_lock_policy(exclusive_lock::Policy *policy);
327
328     journal::Policy *get_journal_policy() const;
329     void set_journal_policy(journal::Policy *policy);
330
331     static void get_thread_pool_instance(CephContext *cct,
332                                          ThreadPool **thread_pool,
333                                          ContextWQ **op_work_queue);
334     static void get_timer_instance(CephContext *cct, SafeTimer **timer,
335                                    Mutex **timer_lock);
336   };
337 }
338
339 #endif