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b39297ae TS |
1 | /* |
2 | * QEMU Guest Agent win32 VSS Requester implementations | |
3 | * | |
4 | * Copyright Hitachi Data Systems Corp. 2013 | |
5 | * | |
6 | * Authors: | |
7 | * Tomoki Sekiyama <tomoki.sekiyama@hds.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2 or later. | |
10 | * See the COPYING file in the top-level directory. | |
11 | */ | |
12 | ||
e55eb806 | 13 | #include "qemu/osdep.h" |
b39297ae TS |
14 | #include "vss-common.h" |
15 | #include "requester.h" | |
f342cc93 | 16 | #include "install.h" |
a9c94277 MA |
17 | #include <inc/win2003/vswriter.h> |
18 | #include <inc/win2003/vsbackup.h> | |
b39297ae TS |
19 | |
20 | /* Max wait time for frozen event (VSS can only hold writes for 10 seconds) */ | |
3d98f9b6 | 21 | #define VSS_TIMEOUT_FREEZE_MSEC 60000 |
b39297ae TS |
22 | |
23 | /* Call QueryStatus every 10 ms while waiting for frozen event */ | |
24 | #define VSS_TIMEOUT_EVENT_MSEC 10 | |
25 | ||
e55eb806 MR |
26 | #define err_set(e, err, fmt, ...) \ |
27 | ((e)->error_setg_win32_wrapper((e)->errp, __FILE__, __LINE__, __func__, \ | |
28 | err, fmt, ## __VA_ARGS__)) | |
08e64640 | 29 | /* Bad idea, works only when (e)->errp != NULL: */ |
b39297ae | 30 | #define err_is_set(e) ((e)->errp && *(e)->errp) |
08e64640 | 31 | /* To lift this restriction, error_propagate(), like we do in QEMU code */ |
b39297ae TS |
32 | |
33 | /* Handle to VSSAPI.DLL */ | |
34 | static HMODULE hLib; | |
35 | ||
36 | /* Functions in VSSAPI.DLL */ | |
37 | typedef HRESULT(STDAPICALLTYPE * t_CreateVssBackupComponents)( | |
38 | OUT IVssBackupComponents**); | |
39 | typedef void(APIENTRY * t_VssFreeSnapshotProperties)(IN VSS_SNAPSHOT_PROP*); | |
40 | static t_CreateVssBackupComponents pCreateVssBackupComponents; | |
41 | static t_VssFreeSnapshotProperties pVssFreeSnapshotProperties; | |
42 | ||
43 | /* Variables used while applications and filesystes are frozen by VSS */ | |
44 | static struct QGAVSSContext { | |
45 | IVssBackupComponents *pVssbc; /* VSS requester interface */ | |
46 | IVssAsync *pAsyncSnapshot; /* async info of VSS snapshot operation */ | |
47 | HANDLE hEventFrozen; /* notify fs/writer freeze from provider */ | |
48 | HANDLE hEventThaw; /* request provider to thaw */ | |
49 | HANDLE hEventTimeout; /* notify timeout in provider */ | |
50 | int cFrozenVols; /* number of frozen volumes */ | |
51 | } vss_ctx; | |
52 | ||
53 | STDAPI requester_init(void) | |
54 | { | |
b39297ae TS |
55 | COMInitializer initializer; /* to call CoInitializeSecurity */ |
56 | HRESULT hr = CoInitializeSecurity( | |
57 | NULL, -1, NULL, NULL, RPC_C_AUTHN_LEVEL_PKT_PRIVACY, | |
58 | RPC_C_IMP_LEVEL_IDENTIFY, NULL, EOAC_NONE, NULL); | |
59 | if (FAILED(hr)) { | |
60 | fprintf(stderr, "failed to CoInitializeSecurity (error %lx)\n", hr); | |
61 | return hr; | |
62 | } | |
63 | ||
64 | hLib = LoadLibraryA("VSSAPI.DLL"); | |
65 | if (!hLib) { | |
66 | fprintf(stderr, "failed to load VSSAPI.DLL\n"); | |
67 | return HRESULT_FROM_WIN32(GetLastError()); | |
68 | } | |
69 | ||
70 | pCreateVssBackupComponents = (t_CreateVssBackupComponents) | |
71 | GetProcAddress(hLib, | |
72 | #ifdef _WIN64 /* 64bit environment */ | |
73 | "?CreateVssBackupComponents@@YAJPEAPEAVIVssBackupComponents@@@Z" | |
74 | #else /* 32bit environment */ | |
75 | "?CreateVssBackupComponents@@YGJPAPAVIVssBackupComponents@@@Z" | |
76 | #endif | |
77 | ); | |
78 | if (!pCreateVssBackupComponents) { | |
79 | fprintf(stderr, "failed to get proc address from VSSAPI.DLL\n"); | |
80 | return HRESULT_FROM_WIN32(GetLastError()); | |
81 | } | |
82 | ||
83 | pVssFreeSnapshotProperties = (t_VssFreeSnapshotProperties) | |
84 | GetProcAddress(hLib, "VssFreeSnapshotProperties"); | |
85 | if (!pVssFreeSnapshotProperties) { | |
86 | fprintf(stderr, "failed to get proc address from VSSAPI.DLL\n"); | |
87 | return HRESULT_FROM_WIN32(GetLastError()); | |
88 | } | |
89 | ||
90 | return S_OK; | |
91 | } | |
92 | ||
93 | static void requester_cleanup(void) | |
94 | { | |
4c1b8f1e | 95 | if (vss_ctx.hEventFrozen) { |
b39297ae | 96 | CloseHandle(vss_ctx.hEventFrozen); |
4c1b8f1e | 97 | vss_ctx.hEventFrozen = NULL; |
b39297ae | 98 | } |
4c1b8f1e | 99 | if (vss_ctx.hEventThaw) { |
b39297ae | 100 | CloseHandle(vss_ctx.hEventThaw); |
4c1b8f1e | 101 | vss_ctx.hEventThaw = NULL; |
b39297ae | 102 | } |
4c1b8f1e | 103 | if (vss_ctx.hEventTimeout) { |
b39297ae | 104 | CloseHandle(vss_ctx.hEventTimeout); |
4c1b8f1e | 105 | vss_ctx.hEventTimeout = NULL; |
b39297ae TS |
106 | } |
107 | if (vss_ctx.pAsyncSnapshot) { | |
108 | vss_ctx.pAsyncSnapshot->Release(); | |
109 | vss_ctx.pAsyncSnapshot = NULL; | |
110 | } | |
111 | if (vss_ctx.pVssbc) { | |
112 | vss_ctx.pVssbc->Release(); | |
113 | vss_ctx.pVssbc = NULL; | |
114 | } | |
115 | vss_ctx.cFrozenVols = 0; | |
116 | } | |
117 | ||
118 | STDAPI requester_deinit(void) | |
119 | { | |
120 | requester_cleanup(); | |
121 | ||
122 | pCreateVssBackupComponents = NULL; | |
123 | pVssFreeSnapshotProperties = NULL; | |
124 | if (hLib) { | |
125 | FreeLibrary(hLib); | |
126 | hLib = NULL; | |
127 | } | |
128 | ||
129 | return S_OK; | |
130 | } | |
131 | ||
132 | static HRESULT WaitForAsync(IVssAsync *pAsync) | |
133 | { | |
134 | HRESULT ret, hr; | |
135 | ||
136 | do { | |
137 | hr = pAsync->Wait(); | |
138 | if (FAILED(hr)) { | |
139 | ret = hr; | |
140 | break; | |
141 | } | |
142 | hr = pAsync->QueryStatus(&ret, NULL); | |
143 | if (FAILED(hr)) { | |
144 | ret = hr; | |
145 | break; | |
146 | } | |
147 | } while (ret == VSS_S_ASYNC_PENDING); | |
148 | ||
149 | return ret; | |
150 | } | |
151 | ||
152 | static void AddComponents(ErrorSet *errset) | |
153 | { | |
154 | unsigned int cWriters, i; | |
155 | VSS_ID id, idInstance, idWriter; | |
156 | BSTR bstrWriterName = NULL; | |
157 | VSS_USAGE_TYPE usage; | |
158 | VSS_SOURCE_TYPE source; | |
159 | unsigned int cComponents, c1, c2, j; | |
160 | COMPointer<IVssExamineWriterMetadata> pMetadata; | |
161 | COMPointer<IVssWMComponent> pComponent; | |
162 | PVSSCOMPONENTINFO info; | |
163 | HRESULT hr; | |
164 | ||
165 | hr = vss_ctx.pVssbc->GetWriterMetadataCount(&cWriters); | |
166 | if (FAILED(hr)) { | |
167 | err_set(errset, hr, "failed to get writer metadata count"); | |
168 | goto out; | |
169 | } | |
170 | ||
171 | for (i = 0; i < cWriters; i++) { | |
172 | hr = vss_ctx.pVssbc->GetWriterMetadata(i, &id, pMetadata.replace()); | |
173 | if (FAILED(hr)) { | |
174 | err_set(errset, hr, "failed to get writer metadata of %d/%d", | |
175 | i, cWriters); | |
176 | goto out; | |
177 | } | |
178 | ||
179 | hr = pMetadata->GetIdentity(&idInstance, &idWriter, | |
180 | &bstrWriterName, &usage, &source); | |
181 | if (FAILED(hr)) { | |
182 | err_set(errset, hr, "failed to get identity of writer %d/%d", | |
183 | i, cWriters); | |
184 | goto out; | |
185 | } | |
186 | ||
187 | hr = pMetadata->GetFileCounts(&c1, &c2, &cComponents); | |
188 | if (FAILED(hr)) { | |
189 | err_set(errset, hr, "failed to get file counts of %S", | |
190 | bstrWriterName); | |
191 | goto out; | |
192 | } | |
193 | ||
194 | for (j = 0; j < cComponents; j++) { | |
195 | hr = pMetadata->GetComponent(j, pComponent.replace()); | |
196 | if (FAILED(hr)) { | |
197 | err_set(errset, hr, | |
198 | "failed to get component %d/%d of %S", | |
199 | j, cComponents, bstrWriterName); | |
200 | goto out; | |
201 | } | |
202 | ||
203 | hr = pComponent->GetComponentInfo(&info); | |
204 | if (FAILED(hr)) { | |
205 | err_set(errset, hr, | |
206 | "failed to get component info %d/%d of %S", | |
207 | j, cComponents, bstrWriterName); | |
208 | goto out; | |
209 | } | |
210 | ||
211 | if (info->bSelectable) { | |
212 | hr = vss_ctx.pVssbc->AddComponent(idInstance, idWriter, | |
213 | info->type, | |
214 | info->bstrLogicalPath, | |
215 | info->bstrComponentName); | |
216 | if (FAILED(hr)) { | |
217 | err_set(errset, hr, "failed to add component %S(%S)", | |
218 | info->bstrComponentName, bstrWriterName); | |
219 | goto out; | |
220 | } | |
221 | } | |
222 | SysFreeString(bstrWriterName); | |
223 | bstrWriterName = NULL; | |
224 | pComponent->FreeComponentInfo(info); | |
225 | info = NULL; | |
226 | } | |
227 | } | |
228 | out: | |
229 | if (bstrWriterName) { | |
230 | SysFreeString(bstrWriterName); | |
231 | } | |
232 | if (pComponent && info) { | |
233 | pComponent->FreeComponentInfo(info); | |
234 | } | |
235 | } | |
236 | ||
0692b03e | 237 | void requester_freeze(int *num_vols, void *mountpoints, ErrorSet *errset) |
b39297ae TS |
238 | { |
239 | COMPointer<IVssAsync> pAsync; | |
240 | HANDLE volume; | |
241 | HRESULT hr; | |
242 | LONG ctx; | |
243 | GUID guidSnapshotSet = GUID_NULL; | |
244 | SECURITY_DESCRIPTOR sd; | |
245 | SECURITY_ATTRIBUTES sa; | |
246 | WCHAR short_volume_name[64], *display_name = short_volume_name; | |
247 | DWORD wait_status; | |
248 | int num_fixed_drives = 0, i; | |
0692b03e | 249 | int num_mount_points = 0; |
b39297ae TS |
250 | |
251 | if (vss_ctx.pVssbc) { /* already frozen */ | |
252 | *num_vols = 0; | |
253 | return; | |
254 | } | |
255 | ||
256 | CoInitialize(NULL); | |
257 | ||
ff8adbcf TS |
258 | /* Allow unrestricted access to events */ |
259 | InitializeSecurityDescriptor(&sd, SECURITY_DESCRIPTOR_REVISION); | |
260 | SetSecurityDescriptorDacl(&sd, TRUE, NULL, FALSE); | |
261 | sa.nLength = sizeof(sa); | |
262 | sa.lpSecurityDescriptor = &sd; | |
263 | sa.bInheritHandle = FALSE; | |
264 | ||
265 | vss_ctx.hEventFrozen = CreateEvent(&sa, TRUE, FALSE, EVENT_NAME_FROZEN); | |
266 | if (!vss_ctx.hEventFrozen) { | |
267 | err_set(errset, GetLastError(), "failed to create event %s", | |
268 | EVENT_NAME_FROZEN); | |
269 | goto out; | |
270 | } | |
271 | vss_ctx.hEventThaw = CreateEvent(&sa, TRUE, FALSE, EVENT_NAME_THAW); | |
272 | if (!vss_ctx.hEventThaw) { | |
273 | err_set(errset, GetLastError(), "failed to create event %s", | |
274 | EVENT_NAME_THAW); | |
275 | goto out; | |
276 | } | |
277 | vss_ctx.hEventTimeout = CreateEvent(&sa, TRUE, FALSE, EVENT_NAME_TIMEOUT); | |
278 | if (!vss_ctx.hEventTimeout) { | |
279 | err_set(errset, GetLastError(), "failed to create event %s", | |
280 | EVENT_NAME_TIMEOUT); | |
281 | goto out; | |
282 | } | |
283 | ||
b39297ae TS |
284 | assert(pCreateVssBackupComponents != NULL); |
285 | hr = pCreateVssBackupComponents(&vss_ctx.pVssbc); | |
286 | if (FAILED(hr)) { | |
287 | err_set(errset, hr, "failed to create VSS backup components"); | |
288 | goto out; | |
289 | } | |
290 | ||
291 | hr = vss_ctx.pVssbc->InitializeForBackup(); | |
292 | if (FAILED(hr)) { | |
293 | err_set(errset, hr, "failed to initialize for backup"); | |
294 | goto out; | |
295 | } | |
296 | ||
297 | hr = vss_ctx.pVssbc->SetBackupState(true, true, VSS_BT_FULL, false); | |
298 | if (FAILED(hr)) { | |
299 | err_set(errset, hr, "failed to set backup state"); | |
300 | goto out; | |
301 | } | |
302 | ||
303 | /* | |
304 | * Currently writable snapshots are not supported. | |
305 | * To prevent the final commit (which requires to write to snapshots), | |
306 | * ATTR_NO_AUTORECOVERY and ATTR_TRANSPORTABLE are specified here. | |
307 | */ | |
308 | ctx = VSS_CTX_APP_ROLLBACK | VSS_VOLSNAP_ATTR_TRANSPORTABLE | | |
309 | VSS_VOLSNAP_ATTR_NO_AUTORECOVERY | VSS_VOLSNAP_ATTR_TXF_RECOVERY; | |
310 | hr = vss_ctx.pVssbc->SetContext(ctx); | |
311 | if (hr == (HRESULT)VSS_E_UNSUPPORTED_CONTEXT) { | |
312 | /* Non-server version of Windows doesn't support ATTR_TRANSPORTABLE */ | |
313 | ctx &= ~VSS_VOLSNAP_ATTR_TRANSPORTABLE; | |
314 | hr = vss_ctx.pVssbc->SetContext(ctx); | |
315 | } | |
316 | if (FAILED(hr)) { | |
317 | err_set(errset, hr, "failed to set backup context"); | |
318 | goto out; | |
319 | } | |
320 | ||
321 | hr = vss_ctx.pVssbc->GatherWriterMetadata(pAsync.replace()); | |
322 | if (SUCCEEDED(hr)) { | |
323 | hr = WaitForAsync(pAsync); | |
324 | } | |
325 | if (FAILED(hr)) { | |
326 | err_set(errset, hr, "failed to gather writer metadata"); | |
327 | goto out; | |
328 | } | |
329 | ||
330 | AddComponents(errset); | |
331 | if (err_is_set(errset)) { | |
332 | goto out; | |
333 | } | |
334 | ||
335 | hr = vss_ctx.pVssbc->StartSnapshotSet(&guidSnapshotSet); | |
336 | if (FAILED(hr)) { | |
337 | err_set(errset, hr, "failed to start snapshot set"); | |
338 | goto out; | |
339 | } | |
340 | ||
0692b03e CH |
341 | if (mountpoints) { |
342 | PWCHAR volume_name_wchar; | |
343 | for (volList *list = (volList *)mountpoints; list; list = list->next) { | |
344 | size_t len = strlen(list->value) + 1; | |
345 | size_t converted = 0; | |
b39297ae | 346 | VSS_ID pid; |
0692b03e CH |
347 | |
348 | volume_name_wchar = new wchar_t[len]; | |
349 | mbstowcs_s(&converted, volume_name_wchar, len, | |
350 | list->value, _TRUNCATE); | |
351 | ||
352 | hr = vss_ctx.pVssbc->AddToSnapshotSet(volume_name_wchar, | |
b39297ae TS |
353 | g_gProviderId, &pid); |
354 | if (FAILED(hr)) { | |
b39297ae | 355 | err_set(errset, hr, "failed to add %S to snapshot set", |
0692b03e CH |
356 | volume_name_wchar); |
357 | delete volume_name_wchar; | |
b39297ae TS |
358 | goto out; |
359 | } | |
0692b03e CH |
360 | num_mount_points++; |
361 | ||
362 | delete volume_name_wchar; | |
b39297ae | 363 | } |
0692b03e CH |
364 | |
365 | if (num_mount_points == 0) { | |
366 | /* If there is no valid mount points, just exit. */ | |
367 | goto out; | |
b39297ae TS |
368 | } |
369 | } | |
370 | ||
0692b03e CH |
371 | if (!mountpoints) { |
372 | volume = FindFirstVolumeW(short_volume_name, sizeof(short_volume_name)); | |
373 | if (volume == INVALID_HANDLE_VALUE) { | |
374 | err_set(errset, hr, "failed to find first volume"); | |
375 | goto out; | |
376 | } | |
377 | ||
378 | for (;;) { | |
379 | if (GetDriveTypeW(short_volume_name) == DRIVE_FIXED) { | |
380 | VSS_ID pid; | |
381 | hr = vss_ctx.pVssbc->AddToSnapshotSet(short_volume_name, | |
382 | g_gProviderId, &pid); | |
383 | if (FAILED(hr)) { | |
384 | WCHAR volume_path_name[PATH_MAX]; | |
385 | if (GetVolumePathNamesForVolumeNameW( | |
386 | short_volume_name, volume_path_name, | |
387 | sizeof(volume_path_name), NULL) && | |
388 | *volume_path_name) { | |
389 | display_name = volume_path_name; | |
390 | } | |
391 | err_set(errset, hr, "failed to add %S to snapshot set", | |
392 | display_name); | |
393 | FindVolumeClose(volume); | |
394 | goto out; | |
395 | } | |
396 | num_fixed_drives++; | |
397 | } | |
398 | if (!FindNextVolumeW(volume, short_volume_name, | |
399 | sizeof(short_volume_name))) { | |
400 | FindVolumeClose(volume); | |
401 | break; | |
402 | } | |
403 | } | |
404 | ||
405 | if (num_fixed_drives == 0) { | |
406 | goto out; /* If there is no fixed drive, just exit. */ | |
407 | } | |
b39297ae TS |
408 | } |
409 | ||
410 | hr = vss_ctx.pVssbc->PrepareForBackup(pAsync.replace()); | |
411 | if (SUCCEEDED(hr)) { | |
412 | hr = WaitForAsync(pAsync); | |
413 | } | |
414 | if (FAILED(hr)) { | |
415 | err_set(errset, hr, "failed to prepare for backup"); | |
416 | goto out; | |
417 | } | |
418 | ||
419 | hr = vss_ctx.pVssbc->GatherWriterStatus(pAsync.replace()); | |
420 | if (SUCCEEDED(hr)) { | |
421 | hr = WaitForAsync(pAsync); | |
422 | } | |
423 | if (FAILED(hr)) { | |
424 | err_set(errset, hr, "failed to gather writer status"); | |
425 | goto out; | |
426 | } | |
427 | ||
b39297ae TS |
428 | /* |
429 | * Start VSS quiescing operations. | |
430 | * CQGAVssProvider::CommitSnapshots will kick vss_ctx.hEventFrozen | |
431 | * after the applications and filesystems are frozen. | |
432 | */ | |
433 | hr = vss_ctx.pVssbc->DoSnapshotSet(&vss_ctx.pAsyncSnapshot); | |
434 | if (FAILED(hr)) { | |
435 | err_set(errset, hr, "failed to do snapshot set"); | |
436 | goto out; | |
437 | } | |
438 | ||
439 | /* Need to call QueryStatus several times to make VSS provider progress */ | |
440 | for (i = 0; i < VSS_TIMEOUT_FREEZE_MSEC/VSS_TIMEOUT_EVENT_MSEC; i++) { | |
441 | HRESULT hr2 = vss_ctx.pAsyncSnapshot->QueryStatus(&hr, NULL); | |
442 | if (FAILED(hr2)) { | |
443 | err_set(errset, hr, "failed to do snapshot set"); | |
444 | goto out; | |
445 | } | |
446 | if (hr != VSS_S_ASYNC_PENDING) { | |
447 | err_set(errset, E_FAIL, | |
448 | "DoSnapshotSet exited without Frozen event"); | |
449 | goto out; | |
450 | } | |
451 | wait_status = WaitForSingleObject(vss_ctx.hEventFrozen, | |
452 | VSS_TIMEOUT_EVENT_MSEC); | |
453 | if (wait_status != WAIT_TIMEOUT) { | |
454 | break; | |
455 | } | |
456 | } | |
4d80d20f CH |
457 | |
458 | if (wait_status == WAIT_TIMEOUT) { | |
459 | err_set(errset, E_FAIL, | |
460 | "timeout when try to receive Frozen event from VSS provider"); | |
461 | /* If we are here, VSS had timeout. | |
462 | * Don't call AbortBackup, just return directly. | |
463 | */ | |
464 | goto out1; | |
465 | } | |
466 | ||
b39297ae TS |
467 | if (wait_status != WAIT_OBJECT_0) { |
468 | err_set(errset, E_FAIL, | |
469 | "couldn't receive Frozen event from VSS provider"); | |
470 | goto out; | |
471 | } | |
472 | ||
0692b03e CH |
473 | if (mountpoints) { |
474 | *num_vols = vss_ctx.cFrozenVols = num_mount_points; | |
475 | } else { | |
476 | *num_vols = vss_ctx.cFrozenVols = num_fixed_drives; | |
477 | } | |
478 | ||
b39297ae TS |
479 | return; |
480 | ||
481 | out: | |
482 | if (vss_ctx.pVssbc) { | |
483 | vss_ctx.pVssbc->AbortBackup(); | |
484 | } | |
4d80d20f CH |
485 | |
486 | out1: | |
b39297ae TS |
487 | requester_cleanup(); |
488 | CoUninitialize(); | |
489 | } | |
490 | ||
491 | ||
0692b03e | 492 | void requester_thaw(int *num_vols, void *mountpints, ErrorSet *errset) |
b39297ae TS |
493 | { |
494 | COMPointer<IVssAsync> pAsync; | |
495 | ||
4c1b8f1e | 496 | if (!vss_ctx.hEventThaw) { |
b39297ae TS |
497 | /* |
498 | * In this case, DoSnapshotSet is aborted or not started, | |
499 | * and no volumes must be frozen. We return without an error. | |
500 | */ | |
501 | *num_vols = 0; | |
502 | return; | |
503 | } | |
504 | ||
505 | /* Tell the provider that the snapshot is finished. */ | |
506 | SetEvent(vss_ctx.hEventThaw); | |
507 | ||
508 | assert(vss_ctx.pVssbc); | |
509 | assert(vss_ctx.pAsyncSnapshot); | |
510 | ||
511 | HRESULT hr = WaitForAsync(vss_ctx.pAsyncSnapshot); | |
512 | switch (hr) { | |
513 | case VSS_S_ASYNC_FINISHED: | |
514 | hr = vss_ctx.pVssbc->BackupComplete(pAsync.replace()); | |
515 | if (SUCCEEDED(hr)) { | |
516 | hr = WaitForAsync(pAsync); | |
517 | } | |
518 | if (FAILED(hr)) { | |
519 | err_set(errset, hr, "failed to complete backup"); | |
520 | } | |
521 | break; | |
522 | ||
523 | case (HRESULT)VSS_E_OBJECT_NOT_FOUND: | |
524 | /* | |
525 | * On Windows earlier than 2008 SP2 which does not support | |
526 | * VSS_VOLSNAP_ATTR_NO_AUTORECOVERY context, the final commit is not | |
527 | * skipped and VSS is aborted by VSS_E_OBJECT_NOT_FOUND. However, as | |
528 | * the system had been frozen until fsfreeze-thaw command was issued, | |
529 | * we ignore this error. | |
530 | */ | |
531 | vss_ctx.pVssbc->AbortBackup(); | |
532 | break; | |
533 | ||
534 | case VSS_E_UNEXPECTED_PROVIDER_ERROR: | |
535 | if (WaitForSingleObject(vss_ctx.hEventTimeout, 0) != WAIT_OBJECT_0) { | |
536 | err_set(errset, hr, "unexpected error in VSS provider"); | |
537 | break; | |
538 | } | |
539 | /* fall through if hEventTimeout is signaled */ | |
540 | ||
541 | case (HRESULT)VSS_E_HOLD_WRITES_TIMEOUT: | |
542 | err_set(errset, hr, "couldn't hold writes: " | |
543 | "fsfreeze is limited up to 10 seconds"); | |
544 | break; | |
545 | ||
546 | default: | |
547 | err_set(errset, hr, "failed to do snapshot set"); | |
548 | } | |
549 | ||
550 | if (err_is_set(errset)) { | |
551 | vss_ctx.pVssbc->AbortBackup(); | |
552 | } | |
553 | *num_vols = vss_ctx.cFrozenVols; | |
554 | requester_cleanup(); | |
555 | ||
556 | CoUninitialize(); | |
f342cc93 | 557 | StopService(); |
b39297ae | 558 | } |