1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
|
// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "librbd/api/Image.h"
#include "include/rados/librados.hpp"
#include "common/dout.h"
#include "common/errno.h"
#include "common/Cond.h"
#include "cls/rbd/cls_rbd_client.h"
#include "librbd/DeepCopyRequest.h"
#include "librbd/ExclusiveLock.h"
#include "librbd/ImageCtx.h"
#include "librbd/ImageState.h"
#include "librbd/internal.h"
#include "librbd/Utils.h"
#include "librbd/api/Config.h"
#include "librbd/api/Trash.h"
#include "librbd/image/CloneRequest.h"
#include "librbd/image/RemoveRequest.h"
#include "librbd/image/PreRemoveRequest.h"
#include <boost/scope_exit.hpp>
#define dout_subsys ceph_subsys_rbd
#undef dout_prefix
#define dout_prefix *_dout << "librbd::api::Image: " << __func__ << ": "
namespace librbd {
namespace api {
namespace {
bool compare_by_pool(const librbd::linked_image_spec_t& lhs,
const librbd::linked_image_spec_t& rhs)
{
if (lhs.pool_id != rhs.pool_id) {
return lhs.pool_id < rhs.pool_id;
} else if (lhs.pool_namespace != rhs.pool_namespace) {
return lhs.pool_namespace < rhs.pool_namespace;
}
return false;
}
bool compare(const librbd::linked_image_spec_t& lhs,
const librbd::linked_image_spec_t& rhs)
{
if (lhs.pool_name != rhs.pool_name) {
return lhs.pool_name < rhs.pool_name;
} else if (lhs.pool_id != rhs.pool_id) {
return lhs.pool_id < rhs.pool_id;
} else if (lhs.pool_namespace != rhs.pool_namespace) {
return lhs.pool_namespace < rhs.pool_namespace;
} else if (lhs.image_name != rhs.image_name) {
return lhs.image_name < rhs.image_name;
} else if (lhs.image_id != rhs.image_id) {
return lhs.image_id < rhs.image_id;
}
return false;
}
template <typename I>
int pre_remove_image(librados::IoCtx& io_ctx, const std::string& image_id) {
I *image_ctx = I::create("", image_id, nullptr, io_ctx, false);
int r = image_ctx->state->open(OPEN_FLAG_SKIP_OPEN_PARENT);
if (r < 0) {
return r;
}
C_SaferCond ctx;
auto req = image::PreRemoveRequest<I>::create(image_ctx, false, &ctx);
req->send();
r = ctx.wait();
image_ctx->state->close();
return r;
}
} // anonymous namespace
template <typename I>
int64_t Image<I>::get_data_pool_id(I *ictx) {
if (ictx->data_ctx.is_valid()) {
return ictx->data_ctx.get_id();
}
int64_t pool_id;
int r = cls_client::get_data_pool(&ictx->md_ctx, ictx->header_oid, &pool_id);
if (r < 0) {
CephContext *cct = ictx->cct;
lderr(cct) << "error getting data pool ID: " << cpp_strerror(r) << dendl;
return r;
}
return pool_id;
}
template <typename I>
int Image<I>::get_op_features(I *ictx, uint64_t *op_features) {
CephContext *cct = ictx->cct;
ldout(cct, 20) << "image_ctx=" << ictx << dendl;
int r = ictx->state->refresh_if_required();
if (r < 0) {
return r;
}
RWLock::RLocker snap_locker(ictx->snap_lock);
*op_features = ictx->op_features;
return 0;
}
template <typename I>
int Image<I>::list_images(librados::IoCtx& io_ctx,
std::vector<image_spec_t> *images) {
CephContext *cct = (CephContext *)io_ctx.cct();
ldout(cct, 20) << "list " << &io_ctx << dendl;
int r;
images->clear();
if (io_ctx.get_namespace().empty()) {
bufferlist bl;
r = io_ctx.read(RBD_DIRECTORY, bl, 0, 0);
if (r == -ENOENT) {
return 0;
} else if (r < 0) {
lderr(cct) << "error listing v1 images: " << cpp_strerror(r) << dendl;
return r;
}
// V1 format images are in a tmap
if (bl.length()) {
auto p = bl.cbegin();
bufferlist header;
std::map<std::string, bufferlist> m;
decode(header, p);
decode(m, p);
for (auto& it : m) {
images->push_back({.id ="", .name = it.first});
}
}
}
// V2 format images
std::map<std::string, std::string> image_names_to_ids;
r = list_images_v2(io_ctx, &image_names_to_ids);
if (r < 0) {
lderr(cct) << "error listing v2 images: " << cpp_strerror(r) << dendl;
return r;
}
for (const auto& img_pair : image_names_to_ids) {
images->push_back({.id = img_pair.second,
.name = img_pair.first});
}
// include V2 images in a partially removed state
std::vector<librbd::trash_image_info_t> trash_images;
r = Trash<I>::list(io_ctx, trash_images, false);
if (r < 0 && r != -EOPNOTSUPP) {
lderr(cct) << "error listing trash images: " << cpp_strerror(r) << dendl;
return r;
}
for (const auto& trash_image : trash_images) {
if (trash_image.source == RBD_TRASH_IMAGE_SOURCE_REMOVING) {
images->push_back({.id = trash_image.id,
.name = trash_image.name});
}
}
return 0;
}
template <typename I>
int Image<I>::list_images_v2(librados::IoCtx& io_ctx, ImageNameToIds *images) {
CephContext *cct = (CephContext *)io_ctx.cct();
ldout(cct, 20) << "io_ctx=" << &io_ctx << dendl;
// new format images are accessed by class methods
int r;
int max_read = 1024;
string last_read = "";
do {
map<string, string> images_page;
r = cls_client::dir_list(&io_ctx, RBD_DIRECTORY, last_read, max_read,
&images_page);
if (r < 0 && r != -ENOENT) {
lderr(cct) << "error listing image in directory: "
<< cpp_strerror(r) << dendl;
return r;
} else if (r == -ENOENT) {
break;
}
for (map<string, string>::const_iterator it = images_page.begin();
it != images_page.end(); ++it) {
images->insert(*it);
}
if (!images_page.empty()) {
last_read = images_page.rbegin()->first;
}
r = images_page.size();
} while (r == max_read);
return 0;
}
template <typename I>
int Image<I>::get_parent(I *ictx,
librbd::linked_image_spec_t *parent_image,
librbd::snap_spec_t *parent_snap) {
auto cct = ictx->cct;
ldout(cct, 20) << "image_ctx=" << ictx << dendl;
int r = ictx->state->refresh_if_required();
if (r < 0) {
return r;
}
RWLock::RLocker snap_locker(ictx->snap_lock);
RWLock::RLocker parent_locker(ictx->parent_lock);
bool release_parent_locks = false;
BOOST_SCOPE_EXIT_ALL(ictx, &release_parent_locks) {
if (release_parent_locks) {
ictx->parent->parent_lock.put_read();
ictx->parent->snap_lock.put_read();
}
};
// if a migration is in-progress, the true parent is the parent
// of the migration source image
auto parent = ictx->parent;
if (!ictx->migration_info.empty() && ictx->parent != nullptr) {
release_parent_locks = true;
ictx->parent->snap_lock.get_read();
ictx->parent->parent_lock.get_read();
parent = ictx->parent->parent;
}
if (parent == nullptr) {
return -ENOENT;
}
parent_image->pool_id = parent->md_ctx.get_id();
parent_image->pool_name = parent->md_ctx.get_pool_name();
parent_image->pool_namespace = parent->md_ctx.get_namespace();
RWLock::RLocker parent_snap_locker(parent->snap_lock);
parent_snap->id = parent->snap_id;
parent_snap->namespace_type = RBD_SNAP_NAMESPACE_TYPE_USER;
if (parent->snap_id != CEPH_NOSNAP) {
auto snap_info = parent->get_snap_info(parent->snap_id);
if (snap_info == nullptr) {
lderr(cct) << "error finding parent snap name: " << cpp_strerror(r)
<< dendl;
return -ENOENT;
}
parent_snap->namespace_type = static_cast<snap_namespace_type_t>(
cls::rbd::get_snap_namespace_type(snap_info->snap_namespace));
parent_snap->name = snap_info->name;
}
parent_image->image_id = parent->id;
parent_image->image_name = parent->name;
parent_image->trash = true;
librbd::trash_image_info_t trash_info;
r = Trash<I>::get(parent->md_ctx, parent->id, &trash_info);
if (r == -ENOENT || r == -EOPNOTSUPP) {
parent_image->trash = false;
} else if (r < 0) {
lderr(cct) << "error looking up trash status: " << cpp_strerror(r)
<< dendl;
return r;
}
return 0;
}
template <typename I>
int Image<I>::list_children(I *ictx,
std::vector<librbd::linked_image_spec_t> *images) {
images->clear();
return list_descendants(ictx, 1, images);
}
template <typename I>
int Image<I>::list_children(I *ictx,
const cls::rbd::ParentImageSpec &parent_spec,
std::vector<librbd::linked_image_spec_t> *images) {
images->clear();
return list_descendants(ictx, parent_spec, 1, images);
}
template <typename I>
int Image<I>::list_descendants(
librados::IoCtx& io_ctx, const std::string &image_id,
const std::optional<size_t> &max_level,
std::vector<librbd::linked_image_spec_t> *images) {
ImageCtx *ictx = new librbd::ImageCtx("", image_id, nullptr,
io_ctx, true);
int r = ictx->state->open(OPEN_FLAG_SKIP_OPEN_PARENT);
if (r < 0) {
if (r == -ENOENT) {
return 0;
}
lderr(ictx->cct) << "failed to open descendant " << image_id
<< " from pool " << io_ctx.get_pool_name() << ":"
<< cpp_strerror(r) << dendl;
return r;
}
r = list_descendants(ictx, max_level, images);
int r1 = ictx->state->close();
if (r1 < 0) {
lderr(ictx->cct) << "error when closing descendant " << image_id
<< " from pool " << io_ctx.get_pool_name() << ":"
<< cpp_strerror(r) << dendl;
}
return r;
}
template <typename I>
int Image<I>::list_descendants(
I *ictx, const std::optional<size_t> &max_level,
std::vector<librbd::linked_image_spec_t> *images) {
RWLock::RLocker l(ictx->snap_lock);
std::vector<librados::snap_t> snap_ids;
if (ictx->snap_id != CEPH_NOSNAP) {
snap_ids.push_back(ictx->snap_id);
} else {
snap_ids = ictx->snaps;
}
for (auto snap_id : snap_ids) {
cls::rbd::ParentImageSpec parent_spec{ictx->md_ctx.get_id(),
ictx->md_ctx.get_namespace(),
ictx->id, snap_id};
int r = list_descendants(ictx, parent_spec, max_level, images);
if (r < 0) {
return r;
}
}
return 0;
}
template <typename I>
int Image<I>::list_descendants(
I *ictx, const cls::rbd::ParentImageSpec &parent_spec,
const std::optional<size_t> &max_level,
std::vector<librbd::linked_image_spec_t> *images) {
auto child_max_level = max_level;
if (child_max_level) {
if (child_max_level == 0) {
return 0;
}
(*child_max_level)--;
}
CephContext *cct = ictx->cct;
ldout(cct, 20) << "ictx=" << ictx << dendl;
// no children for non-layered or old format image
if (!ictx->test_features(RBD_FEATURE_LAYERING, ictx->snap_lock)) {
return 0;
}
librados::Rados rados(ictx->md_ctx);
// search all pools for clone v1 children dependent on this snapshot
std::list<std::pair<int64_t, std::string> > pools;
int r = rados.pool_list2(pools);
if (r < 0) {
lderr(cct) << "error listing pools: " << cpp_strerror(r) << dendl;
return r;
}
for (auto& it : pools) {
int64_t base_tier;
r = rados.pool_get_base_tier(it.first, &base_tier);
if (r == -ENOENT) {
ldout(cct, 1) << "pool " << it.second << " no longer exists" << dendl;
continue;
} else if (r < 0) {
lderr(cct) << "error retrieving base tier for pool " << it.second
<< dendl;
return r;
}
if (it.first != base_tier) {
// pool is a cache; skip it
continue;
}
IoCtx ioctx;
r = util::create_ioctx(ictx->md_ctx, "child image", it.first, {}, &ioctx);
if (r == -ENOENT) {
continue;
} else if (r < 0) {
return r;
}
std::set<std::string> image_ids;
r = cls_client::get_children(&ioctx, RBD_CHILDREN, parent_spec,
image_ids);
if (r < 0 && r != -ENOENT) {
lderr(cct) << "error reading list of children from pool " << it.second
<< dendl;
return r;
}
for (auto& image_id : image_ids) {
images->push_back({
it.first, "", ictx->md_ctx.get_namespace(), image_id, "", false});
r = list_descendants(ioctx, image_id, child_max_level, images);
if (r < 0) {
return r;
}
}
}
// retrieve clone v2 children attached to this snapshot
IoCtx parent_io_ctx;
r = util::create_ioctx(ictx->md_ctx, "parent image", parent_spec.pool_id,
parent_spec.pool_namespace, &parent_io_ctx);
if (r < 0) {
return r;
}
cls::rbd::ChildImageSpecs child_images;
r = cls_client::children_list(&parent_io_ctx,
util::header_name(parent_spec.image_id),
parent_spec.snap_id, &child_images);
if (r < 0 && r != -ENOENT && r != -EOPNOTSUPP) {
lderr(cct) << "error retrieving children: " << cpp_strerror(r) << dendl;
return r;
}
for (auto& child_image : child_images) {
images->push_back({
child_image.pool_id, "", child_image.pool_namespace,
child_image.image_id, "", false});
if (!child_max_level || *child_max_level > 0) {
IoCtx ioctx;
r = util::create_ioctx(ictx->md_ctx, "child image", child_image.pool_id,
child_image.pool_namespace, &ioctx);
if (r == -ENOENT) {
continue;
} else if (r < 0) {
return r;
}
r = list_descendants(ioctx, child_image.image_id, child_max_level,
images);
if (r < 0) {
return r;
}
}
}
// batch lookups by pool + namespace
std::sort(images->begin(), images->end(), compare_by_pool);
int64_t child_pool_id = -1;
librados::IoCtx child_io_ctx;
std::map<std::string, std::pair<std::string, bool>> child_image_id_to_info;
for (auto& image : *images) {
if (child_pool_id == -1 || child_pool_id != image.pool_id ||
child_io_ctx.get_namespace() != image.pool_namespace) {
r = util::create_ioctx(ictx->md_ctx, "child image", image.pool_id,
image.pool_namespace, &child_io_ctx);
if (r == -ENOENT) {
image.pool_name = "";
image.image_name = "";
continue;
} else if (r < 0) {
return r;
}
child_pool_id = image.pool_id;
child_image_id_to_info.clear();
std::map<std::string, std::string> image_names_to_ids;
r = list_images_v2(child_io_ctx, &image_names_to_ids);
if (r < 0) {
lderr(cct) << "error listing v2 images: " << cpp_strerror(r) << dendl;
return r;
}
for (auto& [name, id] : image_names_to_ids) {
child_image_id_to_info.insert({id, {name, false}});
}
std::vector<librbd::trash_image_info_t> trash_images;
r = Trash<I>::list(child_io_ctx, trash_images, false);
if (r < 0 && r != -EOPNOTSUPP) {
lderr(cct) << "error listing trash images: " << cpp_strerror(r)
<< dendl;
return r;
}
for (auto& it : trash_images) {
child_image_id_to_info.insert({
it.id,
{it.name,
it.source == RBD_TRASH_IMAGE_SOURCE_REMOVING ? false : true}});
}
}
auto it = child_image_id_to_info.find(image.image_id);
if (it == child_image_id_to_info.end()) {
lderr(cct) << "error looking up name for image id "
<< image.image_id << " in pool "
<< child_io_ctx.get_pool_name()
<< (image.pool_namespace.empty() ?
"" : "/" + image.pool_namespace) << dendl;
return -ENOENT;
}
image.pool_name = child_io_ctx.get_pool_name();
image.image_name = it->second.first;
image.trash = it->second.second;
}
// final sort by pool + image names
std::sort(images->begin(), images->end(), compare);
return 0;
}
template <typename I>
int Image<I>::deep_copy(I *src, librados::IoCtx& dest_md_ctx,
const char *destname, ImageOptions& opts,
ProgressContext &prog_ctx) {
CephContext *cct = (CephContext *)dest_md_ctx.cct();
ldout(cct, 20) << src->name
<< (src->snap_name.length() ? "@" + src->snap_name : "")
<< " -> " << destname << " opts = " << opts << dendl;
uint64_t features;
uint64_t src_size;
{
RWLock::RLocker snap_locker(src->snap_lock);
if (!src->migration_info.empty()) {
lderr(cct) << "cannot deep copy migrating image" << dendl;
return -EBUSY;
}
features = src->features;
src_size = src->get_image_size(src->snap_id);
}
uint64_t format = 2;
if (opts.get(RBD_IMAGE_OPTION_FORMAT, &format) != 0) {
opts.set(RBD_IMAGE_OPTION_FORMAT, format);
}
if (format == 1) {
lderr(cct) << "old format not supported for destination image" << dendl;
return -EINVAL;
}
uint64_t stripe_unit = src->stripe_unit;
if (opts.get(RBD_IMAGE_OPTION_STRIPE_UNIT, &stripe_unit) != 0) {
opts.set(RBD_IMAGE_OPTION_STRIPE_UNIT, stripe_unit);
}
uint64_t stripe_count = src->stripe_count;
if (opts.get(RBD_IMAGE_OPTION_STRIPE_COUNT, &stripe_count) != 0) {
opts.set(RBD_IMAGE_OPTION_STRIPE_COUNT, stripe_count);
}
uint64_t order = src->order;
if (opts.get(RBD_IMAGE_OPTION_ORDER, &order) != 0) {
opts.set(RBD_IMAGE_OPTION_ORDER, order);
}
if (opts.get(RBD_IMAGE_OPTION_FEATURES, &features) != 0) {
opts.set(RBD_IMAGE_OPTION_FEATURES, features);
}
if (features & ~RBD_FEATURES_ALL) {
lderr(cct) << "librbd does not support requested features" << dendl;
return -ENOSYS;
}
uint64_t flatten = 0;
if (opts.get(RBD_IMAGE_OPTION_FLATTEN, &flatten) == 0) {
opts.unset(RBD_IMAGE_OPTION_FLATTEN);
}
cls::rbd::ParentImageSpec parent_spec;
if (flatten > 0) {
parent_spec.pool_id = -1;
} else {
RWLock::RLocker snap_locker(src->snap_lock);
RWLock::RLocker parent_locker(src->parent_lock);
// use oldest snapshot or HEAD for parent spec
if (!src->snap_info.empty()) {
parent_spec = src->snap_info.begin()->second.parent.spec;
} else {
parent_spec = src->parent_md.spec;
}
}
int r;
if (parent_spec.pool_id == -1) {
r = create(dest_md_ctx, destname, "", src_size, opts, "", "", false);
} else {
librados::IoCtx parent_io_ctx;
r = util::create_ioctx(src->md_ctx, "parent image", parent_spec.pool_id,
parent_spec.pool_namespace, &parent_io_ctx);
if (r < 0) {
return r;
}
ConfigProxy config{cct->_conf};
api::Config<I>::apply_pool_overrides(dest_md_ctx, &config);
C_SaferCond ctx;
std::string dest_id = util::generate_image_id(dest_md_ctx);
auto *req = image::CloneRequest<I>::create(
config, parent_io_ctx, parent_spec.image_id, "", parent_spec.snap_id,
dest_md_ctx, destname, dest_id, opts, "", "", src->op_work_queue, &ctx);
req->send();
r = ctx.wait();
}
if (r < 0) {
lderr(cct) << "header creation failed" << dendl;
return r;
}
opts.set(RBD_IMAGE_OPTION_ORDER, static_cast<uint64_t>(order));
auto dest = new I(destname, "", nullptr, dest_md_ctx, false);
r = dest->state->open(0);
if (r < 0) {
lderr(cct) << "failed to read newly created header" << dendl;
return r;
}
C_SaferCond lock_ctx;
{
RWLock::WLocker locker(dest->owner_lock);
if (dest->exclusive_lock == nullptr ||
dest->exclusive_lock->is_lock_owner()) {
lock_ctx.complete(0);
} else {
dest->exclusive_lock->acquire_lock(&lock_ctx);
}
}
r = lock_ctx.wait();
if (r < 0) {
lderr(cct) << "failed to request exclusive lock: " << cpp_strerror(r)
<< dendl;
dest->state->close();
return r;
}
r = deep_copy(src, dest, flatten > 0, prog_ctx);
int close_r = dest->state->close();
if (r == 0 && close_r < 0) {
r = close_r;
}
return r;
}
template <typename I>
int Image<I>::deep_copy(I *src, I *dest, bool flatten,
ProgressContext &prog_ctx) {
CephContext *cct = src->cct;
librados::snap_t snap_id_start = 0;
librados::snap_t snap_id_end;
{
RWLock::RLocker snap_locker(src->snap_lock);
snap_id_end = src->snap_id;
}
ThreadPool *thread_pool;
ContextWQ *op_work_queue;
ImageCtx::get_thread_pool_instance(cct, &thread_pool, &op_work_queue);
C_SaferCond cond;
SnapSeqs snap_seqs;
auto req = DeepCopyRequest<I>::create(src, dest, snap_id_start, snap_id_end,
0U, flatten, boost::none, op_work_queue,
&snap_seqs, &prog_ctx, &cond);
req->send();
int r = cond.wait();
if (r < 0) {
return r;
}
return 0;
}
template <typename I>
int Image<I>::snap_set(I *ictx,
const cls::rbd::SnapshotNamespace &snap_namespace,
const char *snap_name) {
ldout(ictx->cct, 20) << "snap_set " << ictx << " snap = "
<< (snap_name ? snap_name : "NULL") << dendl;
// ignore return value, since we may be set to a non-existent
// snapshot and the user is trying to fix that
ictx->state->refresh_if_required();
uint64_t snap_id = CEPH_NOSNAP;
std::string name(snap_name == nullptr ? "" : snap_name);
if (!name.empty()) {
RWLock::RLocker snap_locker(ictx->snap_lock);
snap_id = ictx->get_snap_id(cls::rbd::UserSnapshotNamespace{},
snap_name);
if (snap_id == CEPH_NOSNAP) {
return -ENOENT;
}
}
return snap_set(ictx, snap_id);
}
template <typename I>
int Image<I>::snap_set(I *ictx, uint64_t snap_id) {
ldout(ictx->cct, 20) << "snap_set " << ictx << " "
<< "snap_id=" << snap_id << dendl;
// ignore return value, since we may be set to a non-existent
// snapshot and the user is trying to fix that
ictx->state->refresh_if_required();
C_SaferCond ctx;
ictx->state->snap_set(snap_id, &ctx);
int r = ctx.wait();
if (r < 0) {
if (r != -ENOENT) {
lderr(ictx->cct) << "failed to " << (snap_id == CEPH_NOSNAP ? "un" : "")
<< "set snapshot: " << cpp_strerror(r) << dendl;
}
return r;
}
return 0;
}
template <typename I>
int Image<I>::remove(IoCtx& io_ctx, const std::string &image_name,
ProgressContext& prog_ctx)
{
CephContext *cct((CephContext *)io_ctx.cct());
ldout(cct, 20) << "name=" << image_name << dendl;
// look up the V2 image id based on the image name
std::string image_id;
int r = cls_client::dir_get_id(&io_ctx, RBD_DIRECTORY, image_name,
&image_id);
if (r == -ENOENT) {
// check if it already exists in trash from an aborted trash remove attempt
std::vector<trash_image_info_t> trash_entries;
r = Trash<I>::list(io_ctx, trash_entries, false);
if (r < 0) {
return r;
} else if (r >= 0) {
for (auto& entry : trash_entries) {
if (entry.name == image_name &&
entry.source == RBD_TRASH_IMAGE_SOURCE_REMOVING) {
return Trash<I>::remove(io_ctx, entry.id, true, prog_ctx);
}
}
}
// fall-through if we failed to locate the image in the V2 directory and
// trash
} else if (r < 0) {
lderr(cct) << "failed to retrieve image id: " << cpp_strerror(r) << dendl;
return r;
} else {
// attempt to move the image to the trash (and optionally immediately
// delete the image)
ConfigProxy config(cct->_conf);
Config<I>::apply_pool_overrides(io_ctx, &config);
rbd_trash_image_source_t trash_image_source =
RBD_TRASH_IMAGE_SOURCE_REMOVING;
uint64_t expire_seconds = 0;
if (config.get_val<bool>("rbd_move_to_trash_on_remove")) {
// keep the image in the trash upon remove requests
trash_image_source = RBD_TRASH_IMAGE_SOURCE_USER;
expire_seconds = config.get_val<uint64_t>(
"rbd_move_to_trash_on_remove_expire_seconds");
} else {
// attempt to pre-validate the removal before moving to trash and
// removing
r = pre_remove_image<I>(io_ctx, image_id);
if (r < 0 && r != -ENOENT) {
return r;
}
}
r = Trash<I>::move(io_ctx, trash_image_source, image_name, image_id,
expire_seconds);
if (r >= 0) {
if (trash_image_source == RBD_TRASH_IMAGE_SOURCE_REMOVING) {
// proceed with attempting to immediately remove the image
r = Trash<I>::remove(io_ctx, image_id, true, prog_ctx);
if (r == -ENOTEMPTY || r == -EBUSY || r == -EMLINK) {
// best-effort try to restore the image if the removal
// failed for possible expected reasons
Trash<I>::restore(io_ctx, {cls::rbd::TRASH_IMAGE_SOURCE_REMOVING},
image_id, image_name);
}
}
return r;
} else if (r < 0 && r != -EOPNOTSUPP) {
return r;
}
// fall-through if trash isn't supported
}
ThreadPool *thread_pool;
ContextWQ *op_work_queue;
ImageCtx::get_thread_pool_instance(cct, &thread_pool, &op_work_queue);
// might be a V1 image format that cannot be moved to the trash
// and would not have been listed in the V2 directory -- or the OSDs
// are too old and don't support the trash feature
C_SaferCond cond;
auto req = librbd::image::RemoveRequest<I>::create(
io_ctx, image_name, "", false, false, prog_ctx, op_work_queue, &cond);
req->send();
return cond.wait();
}
} // namespace api
} // namespace librbd
template class librbd::api::Image<librbd::ImageCtx>;
|