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Commit | Line | Data |
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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 | 14 | #include "vss-common.h" |
2f84cf69 | 15 | #include "vss-debug.h" |
b39297ae | 16 | #include "requester.h" |
f342cc93 | 17 | #include "install.h" |
61fb0bd1 MAL |
18 | #include <vswriter.h> |
19 | #include <vsbackup.h> | |
b39297ae TS |
20 | |
21 | /* Max wait time for frozen event (VSS can only hold writes for 10 seconds) */ | |
3d98f9b6 | 22 | #define VSS_TIMEOUT_FREEZE_MSEC 60000 |
b39297ae TS |
23 | |
24 | /* Call QueryStatus every 10 ms while waiting for frozen event */ | |
25 | #define VSS_TIMEOUT_EVENT_MSEC 10 | |
26 | ||
410542d4 KM |
27 | #define DEFAULT_VSS_BACKUP_TYPE VSS_BT_FULL |
28 | ||
e55eb806 MR |
29 | #define err_set(e, err, fmt, ...) \ |
30 | ((e)->error_setg_win32_wrapper((e)->errp, __FILE__, __LINE__, __func__, \ | |
31 | err, fmt, ## __VA_ARGS__)) | |
08e64640 | 32 | /* Bad idea, works only when (e)->errp != NULL: */ |
b39297ae | 33 | #define err_is_set(e) ((e)->errp && *(e)->errp) |
08e64640 | 34 | /* To lift this restriction, error_propagate(), like we do in QEMU code */ |
b39297ae TS |
35 | |
36 | /* Handle to VSSAPI.DLL */ | |
37 | static HMODULE hLib; | |
38 | ||
39 | /* Functions in VSSAPI.DLL */ | |
40 | typedef HRESULT(STDAPICALLTYPE * t_CreateVssBackupComponents)( | |
41 | OUT IVssBackupComponents**); | |
42 | typedef void(APIENTRY * t_VssFreeSnapshotProperties)(IN VSS_SNAPSHOT_PROP*); | |
43 | static t_CreateVssBackupComponents pCreateVssBackupComponents; | |
44 | static t_VssFreeSnapshotProperties pVssFreeSnapshotProperties; | |
45 | ||
46 | /* Variables used while applications and filesystes are frozen by VSS */ | |
47 | static struct QGAVSSContext { | |
48 | IVssBackupComponents *pVssbc; /* VSS requester interface */ | |
49 | IVssAsync *pAsyncSnapshot; /* async info of VSS snapshot operation */ | |
50 | HANDLE hEventFrozen; /* notify fs/writer freeze from provider */ | |
51 | HANDLE hEventThaw; /* request provider to thaw */ | |
52 | HANDLE hEventTimeout; /* notify timeout in provider */ | |
53 | int cFrozenVols; /* number of frozen volumes */ | |
54 | } vss_ctx; | |
55 | ||
56 | STDAPI requester_init(void) | |
57 | { | |
b39297ae TS |
58 | COMInitializer initializer; /* to call CoInitializeSecurity */ |
59 | HRESULT hr = CoInitializeSecurity( | |
60 | NULL, -1, NULL, NULL, RPC_C_AUTHN_LEVEL_PKT_PRIVACY, | |
61 | RPC_C_IMP_LEVEL_IDENTIFY, NULL, EOAC_NONE, NULL); | |
62 | if (FAILED(hr)) { | |
2f84cf69 | 63 | qga_debug("failed to CoInitializeSecurity (error %lx)", hr); |
b39297ae TS |
64 | return hr; |
65 | } | |
66 | ||
67 | hLib = LoadLibraryA("VSSAPI.DLL"); | |
68 | if (!hLib) { | |
2f84cf69 | 69 | qga_debug("failed to load VSSAPI.DLL"); |
b39297ae TS |
70 | return HRESULT_FROM_WIN32(GetLastError()); |
71 | } | |
72 | ||
73 | pCreateVssBackupComponents = (t_CreateVssBackupComponents) | |
74 | GetProcAddress(hLib, | |
75 | #ifdef _WIN64 /* 64bit environment */ | |
76 | "?CreateVssBackupComponents@@YAJPEAPEAVIVssBackupComponents@@@Z" | |
77 | #else /* 32bit environment */ | |
78 | "?CreateVssBackupComponents@@YGJPAPAVIVssBackupComponents@@@Z" | |
79 | #endif | |
80 | ); | |
81 | if (!pCreateVssBackupComponents) { | |
2f84cf69 | 82 | qga_debug("failed to get proc address from VSSAPI.DLL"); |
b39297ae TS |
83 | return HRESULT_FROM_WIN32(GetLastError()); |
84 | } | |
85 | ||
86 | pVssFreeSnapshotProperties = (t_VssFreeSnapshotProperties) | |
87 | GetProcAddress(hLib, "VssFreeSnapshotProperties"); | |
88 | if (!pVssFreeSnapshotProperties) { | |
2f84cf69 | 89 | qga_debug("failed to get proc address from VSSAPI.DLL"); |
b39297ae TS |
90 | return HRESULT_FROM_WIN32(GetLastError()); |
91 | } | |
92 | ||
93 | return S_OK; | |
94 | } | |
95 | ||
96 | static void requester_cleanup(void) | |
97 | { | |
4c1b8f1e | 98 | if (vss_ctx.hEventFrozen) { |
b39297ae | 99 | CloseHandle(vss_ctx.hEventFrozen); |
4c1b8f1e | 100 | vss_ctx.hEventFrozen = NULL; |
b39297ae | 101 | } |
4c1b8f1e | 102 | if (vss_ctx.hEventThaw) { |
b39297ae | 103 | CloseHandle(vss_ctx.hEventThaw); |
4c1b8f1e | 104 | vss_ctx.hEventThaw = NULL; |
b39297ae | 105 | } |
4c1b8f1e | 106 | if (vss_ctx.hEventTimeout) { |
b39297ae | 107 | CloseHandle(vss_ctx.hEventTimeout); |
4c1b8f1e | 108 | vss_ctx.hEventTimeout = NULL; |
b39297ae TS |
109 | } |
110 | if (vss_ctx.pAsyncSnapshot) { | |
111 | vss_ctx.pAsyncSnapshot->Release(); | |
112 | vss_ctx.pAsyncSnapshot = NULL; | |
113 | } | |
114 | if (vss_ctx.pVssbc) { | |
115 | vss_ctx.pVssbc->Release(); | |
116 | vss_ctx.pVssbc = NULL; | |
117 | } | |
118 | vss_ctx.cFrozenVols = 0; | |
119 | } | |
120 | ||
121 | STDAPI requester_deinit(void) | |
122 | { | |
123 | requester_cleanup(); | |
124 | ||
125 | pCreateVssBackupComponents = NULL; | |
126 | pVssFreeSnapshotProperties = NULL; | |
127 | if (hLib) { | |
128 | FreeLibrary(hLib); | |
129 | hLib = NULL; | |
130 | } | |
131 | ||
132 | return S_OK; | |
133 | } | |
134 | ||
135 | static HRESULT WaitForAsync(IVssAsync *pAsync) | |
136 | { | |
137 | HRESULT ret, hr; | |
138 | ||
139 | do { | |
140 | hr = pAsync->Wait(); | |
141 | if (FAILED(hr)) { | |
142 | ret = hr; | |
143 | break; | |
144 | } | |
145 | hr = pAsync->QueryStatus(&ret, NULL); | |
146 | if (FAILED(hr)) { | |
147 | ret = hr; | |
148 | break; | |
149 | } | |
150 | } while (ret == VSS_S_ASYNC_PENDING); | |
151 | ||
152 | return ret; | |
153 | } | |
154 | ||
155 | static void AddComponents(ErrorSet *errset) | |
156 | { | |
157 | unsigned int cWriters, i; | |
158 | VSS_ID id, idInstance, idWriter; | |
159 | BSTR bstrWriterName = NULL; | |
160 | VSS_USAGE_TYPE usage; | |
161 | VSS_SOURCE_TYPE source; | |
162 | unsigned int cComponents, c1, c2, j; | |
163 | COMPointer<IVssExamineWriterMetadata> pMetadata; | |
164 | COMPointer<IVssWMComponent> pComponent; | |
165 | PVSSCOMPONENTINFO info; | |
166 | HRESULT hr; | |
167 | ||
168 | hr = vss_ctx.pVssbc->GetWriterMetadataCount(&cWriters); | |
169 | if (FAILED(hr)) { | |
170 | err_set(errset, hr, "failed to get writer metadata count"); | |
171 | goto out; | |
172 | } | |
173 | ||
174 | for (i = 0; i < cWriters; i++) { | |
175 | hr = vss_ctx.pVssbc->GetWriterMetadata(i, &id, pMetadata.replace()); | |
176 | if (FAILED(hr)) { | |
177 | err_set(errset, hr, "failed to get writer metadata of %d/%d", | |
178 | i, cWriters); | |
179 | goto out; | |
180 | } | |
181 | ||
182 | hr = pMetadata->GetIdentity(&idInstance, &idWriter, | |
183 | &bstrWriterName, &usage, &source); | |
184 | if (FAILED(hr)) { | |
185 | err_set(errset, hr, "failed to get identity of writer %d/%d", | |
186 | i, cWriters); | |
187 | goto out; | |
188 | } | |
189 | ||
190 | hr = pMetadata->GetFileCounts(&c1, &c2, &cComponents); | |
191 | if (FAILED(hr)) { | |
192 | err_set(errset, hr, "failed to get file counts of %S", | |
193 | bstrWriterName); | |
194 | goto out; | |
195 | } | |
196 | ||
197 | for (j = 0; j < cComponents; j++) { | |
198 | hr = pMetadata->GetComponent(j, pComponent.replace()); | |
199 | if (FAILED(hr)) { | |
200 | err_set(errset, hr, | |
201 | "failed to get component %d/%d of %S", | |
202 | j, cComponents, bstrWriterName); | |
203 | goto out; | |
204 | } | |
205 | ||
206 | hr = pComponent->GetComponentInfo(&info); | |
207 | if (FAILED(hr)) { | |
208 | err_set(errset, hr, | |
209 | "failed to get component info %d/%d of %S", | |
210 | j, cComponents, bstrWriterName); | |
211 | goto out; | |
212 | } | |
213 | ||
214 | if (info->bSelectable) { | |
215 | hr = vss_ctx.pVssbc->AddComponent(idInstance, idWriter, | |
216 | info->type, | |
217 | info->bstrLogicalPath, | |
218 | info->bstrComponentName); | |
219 | if (FAILED(hr)) { | |
220 | err_set(errset, hr, "failed to add component %S(%S)", | |
221 | info->bstrComponentName, bstrWriterName); | |
222 | goto out; | |
223 | } | |
224 | } | |
225 | SysFreeString(bstrWriterName); | |
226 | bstrWriterName = NULL; | |
227 | pComponent->FreeComponentInfo(info); | |
228 | info = NULL; | |
229 | } | |
230 | } | |
231 | out: | |
232 | if (bstrWriterName) { | |
233 | SysFreeString(bstrWriterName); | |
234 | } | |
235 | if (pComponent && info) { | |
236 | pComponent->FreeComponentInfo(info); | |
237 | } | |
238 | } | |
239 | ||
410542d4 KM |
240 | DWORD get_reg_dword_value(HKEY baseKey, LPCSTR subKey, LPCSTR valueName, |
241 | DWORD defaultData) | |
242 | { | |
243 | DWORD regGetValueError; | |
244 | DWORD dwordData; | |
245 | DWORD dataSize = sizeof(DWORD); | |
246 | ||
247 | regGetValueError = RegGetValue(baseKey, subKey, valueName, RRF_RT_DWORD, | |
248 | NULL, &dwordData, &dataSize); | |
249 | if (regGetValueError != ERROR_SUCCESS) { | |
250 | return defaultData; | |
251 | } | |
252 | return dwordData; | |
253 | } | |
254 | ||
255 | bool is_valid_vss_backup_type(VSS_BACKUP_TYPE vssBT) | |
256 | { | |
257 | return (vssBT > VSS_BT_UNDEFINED && vssBT < VSS_BT_OTHER); | |
258 | } | |
259 | ||
260 | VSS_BACKUP_TYPE get_vss_backup_type( | |
261 | VSS_BACKUP_TYPE defaultVssBT = DEFAULT_VSS_BACKUP_TYPE) | |
262 | { | |
263 | VSS_BACKUP_TYPE vssBackupType; | |
264 | ||
265 | vssBackupType = static_cast<VSS_BACKUP_TYPE>( | |
266 | get_reg_dword_value(HKEY_LOCAL_MACHINE, | |
267 | QGA_PROVIDER_REGISTRY_ADDRESS, | |
268 | "VssOption", | |
269 | defaultVssBT)); | |
270 | if (!is_valid_vss_backup_type(vssBackupType)) { | |
271 | return defaultVssBT; | |
272 | } | |
273 | return vssBackupType; | |
274 | } | |
275 | ||
0692b03e | 276 | void requester_freeze(int *num_vols, void *mountpoints, ErrorSet *errset) |
b39297ae TS |
277 | { |
278 | COMPointer<IVssAsync> pAsync; | |
279 | HANDLE volume; | |
280 | HRESULT hr; | |
281 | LONG ctx; | |
282 | GUID guidSnapshotSet = GUID_NULL; | |
283 | SECURITY_DESCRIPTOR sd; | |
284 | SECURITY_ATTRIBUTES sa; | |
285 | WCHAR short_volume_name[64], *display_name = short_volume_name; | |
286 | DWORD wait_status; | |
287 | int num_fixed_drives = 0, i; | |
0692b03e | 288 | int num_mount_points = 0; |
0961f929 | 289 | VSS_BACKUP_TYPE vss_bt = get_vss_backup_type(); |
b39297ae TS |
290 | |
291 | if (vss_ctx.pVssbc) { /* already frozen */ | |
292 | *num_vols = 0; | |
293 | return; | |
294 | } | |
295 | ||
296 | CoInitialize(NULL); | |
297 | ||
ff8adbcf TS |
298 | /* Allow unrestricted access to events */ |
299 | InitializeSecurityDescriptor(&sd, SECURITY_DESCRIPTOR_REVISION); | |
300 | SetSecurityDescriptorDacl(&sd, TRUE, NULL, FALSE); | |
301 | sa.nLength = sizeof(sa); | |
302 | sa.lpSecurityDescriptor = &sd; | |
303 | sa.bInheritHandle = FALSE; | |
304 | ||
305 | vss_ctx.hEventFrozen = CreateEvent(&sa, TRUE, FALSE, EVENT_NAME_FROZEN); | |
306 | if (!vss_ctx.hEventFrozen) { | |
307 | err_set(errset, GetLastError(), "failed to create event %s", | |
308 | EVENT_NAME_FROZEN); | |
309 | goto out; | |
310 | } | |
311 | vss_ctx.hEventThaw = CreateEvent(&sa, TRUE, FALSE, EVENT_NAME_THAW); | |
312 | if (!vss_ctx.hEventThaw) { | |
313 | err_set(errset, GetLastError(), "failed to create event %s", | |
314 | EVENT_NAME_THAW); | |
315 | goto out; | |
316 | } | |
317 | vss_ctx.hEventTimeout = CreateEvent(&sa, TRUE, FALSE, EVENT_NAME_TIMEOUT); | |
318 | if (!vss_ctx.hEventTimeout) { | |
319 | err_set(errset, GetLastError(), "failed to create event %s", | |
320 | EVENT_NAME_TIMEOUT); | |
321 | goto out; | |
322 | } | |
323 | ||
b39297ae TS |
324 | assert(pCreateVssBackupComponents != NULL); |
325 | hr = pCreateVssBackupComponents(&vss_ctx.pVssbc); | |
326 | if (FAILED(hr)) { | |
327 | err_set(errset, hr, "failed to create VSS backup components"); | |
328 | goto out; | |
329 | } | |
330 | ||
331 | hr = vss_ctx.pVssbc->InitializeForBackup(); | |
332 | if (FAILED(hr)) { | |
333 | err_set(errset, hr, "failed to initialize for backup"); | |
334 | goto out; | |
335 | } | |
336 | ||
0961f929 | 337 | hr = vss_ctx.pVssbc->SetBackupState(true, true, vss_bt, false); |
b39297ae TS |
338 | if (FAILED(hr)) { |
339 | err_set(errset, hr, "failed to set backup state"); | |
340 | goto out; | |
341 | } | |
342 | ||
343 | /* | |
344 | * Currently writable snapshots are not supported. | |
345 | * To prevent the final commit (which requires to write to snapshots), | |
346 | * ATTR_NO_AUTORECOVERY and ATTR_TRANSPORTABLE are specified here. | |
347 | */ | |
348 | ctx = VSS_CTX_APP_ROLLBACK | VSS_VOLSNAP_ATTR_TRANSPORTABLE | | |
349 | VSS_VOLSNAP_ATTR_NO_AUTORECOVERY | VSS_VOLSNAP_ATTR_TXF_RECOVERY; | |
350 | hr = vss_ctx.pVssbc->SetContext(ctx); | |
351 | if (hr == (HRESULT)VSS_E_UNSUPPORTED_CONTEXT) { | |
352 | /* Non-server version of Windows doesn't support ATTR_TRANSPORTABLE */ | |
353 | ctx &= ~VSS_VOLSNAP_ATTR_TRANSPORTABLE; | |
354 | hr = vss_ctx.pVssbc->SetContext(ctx); | |
355 | } | |
356 | if (FAILED(hr)) { | |
357 | err_set(errset, hr, "failed to set backup context"); | |
358 | goto out; | |
359 | } | |
360 | ||
361 | hr = vss_ctx.pVssbc->GatherWriterMetadata(pAsync.replace()); | |
362 | if (SUCCEEDED(hr)) { | |
363 | hr = WaitForAsync(pAsync); | |
364 | } | |
365 | if (FAILED(hr)) { | |
366 | err_set(errset, hr, "failed to gather writer metadata"); | |
367 | goto out; | |
368 | } | |
369 | ||
370 | AddComponents(errset); | |
371 | if (err_is_set(errset)) { | |
372 | goto out; | |
373 | } | |
374 | ||
375 | hr = vss_ctx.pVssbc->StartSnapshotSet(&guidSnapshotSet); | |
376 | if (FAILED(hr)) { | |
377 | err_set(errset, hr, "failed to start snapshot set"); | |
378 | goto out; | |
379 | } | |
380 | ||
0692b03e CH |
381 | if (mountpoints) { |
382 | PWCHAR volume_name_wchar; | |
383 | for (volList *list = (volList *)mountpoints; list; list = list->next) { | |
384 | size_t len = strlen(list->value) + 1; | |
385 | size_t converted = 0; | |
b39297ae | 386 | VSS_ID pid; |
0692b03e CH |
387 | |
388 | volume_name_wchar = new wchar_t[len]; | |
389 | mbstowcs_s(&converted, volume_name_wchar, len, | |
390 | list->value, _TRUNCATE); | |
391 | ||
392 | hr = vss_ctx.pVssbc->AddToSnapshotSet(volume_name_wchar, | |
b39297ae TS |
393 | g_gProviderId, &pid); |
394 | if (FAILED(hr)) { | |
b39297ae | 395 | err_set(errset, hr, "failed to add %S to snapshot set", |
0692b03e | 396 | volume_name_wchar); |
6c1d88c7 | 397 | delete[] volume_name_wchar; |
b39297ae TS |
398 | goto out; |
399 | } | |
0692b03e CH |
400 | num_mount_points++; |
401 | ||
6c1d88c7 | 402 | delete[] volume_name_wchar; |
b39297ae | 403 | } |
0692b03e CH |
404 | |
405 | if (num_mount_points == 0) { | |
406 | /* If there is no valid mount points, just exit. */ | |
407 | goto out; | |
b39297ae TS |
408 | } |
409 | } | |
410 | ||
0692b03e CH |
411 | if (!mountpoints) { |
412 | volume = FindFirstVolumeW(short_volume_name, sizeof(short_volume_name)); | |
413 | if (volume == INVALID_HANDLE_VALUE) { | |
414 | err_set(errset, hr, "failed to find first volume"); | |
415 | goto out; | |
416 | } | |
417 | ||
418 | for (;;) { | |
419 | if (GetDriveTypeW(short_volume_name) == DRIVE_FIXED) { | |
420 | VSS_ID pid; | |
421 | hr = vss_ctx.pVssbc->AddToSnapshotSet(short_volume_name, | |
422 | g_gProviderId, &pid); | |
423 | if (FAILED(hr)) { | |
424 | WCHAR volume_path_name[PATH_MAX]; | |
425 | if (GetVolumePathNamesForVolumeNameW( | |
426 | short_volume_name, volume_path_name, | |
427 | sizeof(volume_path_name), NULL) && | |
428 | *volume_path_name) { | |
429 | display_name = volume_path_name; | |
430 | } | |
431 | err_set(errset, hr, "failed to add %S to snapshot set", | |
432 | display_name); | |
433 | FindVolumeClose(volume); | |
434 | goto out; | |
435 | } | |
436 | num_fixed_drives++; | |
437 | } | |
438 | if (!FindNextVolumeW(volume, short_volume_name, | |
439 | sizeof(short_volume_name))) { | |
440 | FindVolumeClose(volume); | |
441 | break; | |
442 | } | |
443 | } | |
444 | ||
445 | if (num_fixed_drives == 0) { | |
446 | goto out; /* If there is no fixed drive, just exit. */ | |
447 | } | |
b39297ae TS |
448 | } |
449 | ||
450 | hr = vss_ctx.pVssbc->PrepareForBackup(pAsync.replace()); | |
451 | if (SUCCEEDED(hr)) { | |
452 | hr = WaitForAsync(pAsync); | |
453 | } | |
454 | if (FAILED(hr)) { | |
455 | err_set(errset, hr, "failed to prepare for backup"); | |
456 | goto out; | |
457 | } | |
458 | ||
459 | hr = vss_ctx.pVssbc->GatherWriterStatus(pAsync.replace()); | |
460 | if (SUCCEEDED(hr)) { | |
461 | hr = WaitForAsync(pAsync); | |
462 | } | |
463 | if (FAILED(hr)) { | |
464 | err_set(errset, hr, "failed to gather writer status"); | |
465 | goto out; | |
466 | } | |
467 | ||
b39297ae TS |
468 | /* |
469 | * Start VSS quiescing operations. | |
470 | * CQGAVssProvider::CommitSnapshots will kick vss_ctx.hEventFrozen | |
471 | * after the applications and filesystems are frozen. | |
472 | */ | |
473 | hr = vss_ctx.pVssbc->DoSnapshotSet(&vss_ctx.pAsyncSnapshot); | |
474 | if (FAILED(hr)) { | |
475 | err_set(errset, hr, "failed to do snapshot set"); | |
476 | goto out; | |
477 | } | |
478 | ||
479 | /* Need to call QueryStatus several times to make VSS provider progress */ | |
480 | for (i = 0; i < VSS_TIMEOUT_FREEZE_MSEC/VSS_TIMEOUT_EVENT_MSEC; i++) { | |
481 | HRESULT hr2 = vss_ctx.pAsyncSnapshot->QueryStatus(&hr, NULL); | |
482 | if (FAILED(hr2)) { | |
483 | err_set(errset, hr, "failed to do snapshot set"); | |
484 | goto out; | |
485 | } | |
486 | if (hr != VSS_S_ASYNC_PENDING) { | |
487 | err_set(errset, E_FAIL, | |
488 | "DoSnapshotSet exited without Frozen event"); | |
489 | goto out; | |
490 | } | |
491 | wait_status = WaitForSingleObject(vss_ctx.hEventFrozen, | |
492 | VSS_TIMEOUT_EVENT_MSEC); | |
493 | if (wait_status != WAIT_TIMEOUT) { | |
494 | break; | |
495 | } | |
496 | } | |
4d80d20f CH |
497 | |
498 | if (wait_status == WAIT_TIMEOUT) { | |
499 | err_set(errset, E_FAIL, | |
500 | "timeout when try to receive Frozen event from VSS provider"); | |
501 | /* If we are here, VSS had timeout. | |
502 | * Don't call AbortBackup, just return directly. | |
503 | */ | |
504 | goto out1; | |
505 | } | |
506 | ||
b39297ae TS |
507 | if (wait_status != WAIT_OBJECT_0) { |
508 | err_set(errset, E_FAIL, | |
509 | "couldn't receive Frozen event from VSS provider"); | |
510 | goto out; | |
511 | } | |
512 | ||
0692b03e CH |
513 | if (mountpoints) { |
514 | *num_vols = vss_ctx.cFrozenVols = num_mount_points; | |
515 | } else { | |
516 | *num_vols = vss_ctx.cFrozenVols = num_fixed_drives; | |
517 | } | |
518 | ||
b39297ae TS |
519 | return; |
520 | ||
521 | out: | |
522 | if (vss_ctx.pVssbc) { | |
523 | vss_ctx.pVssbc->AbortBackup(); | |
524 | } | |
4d80d20f CH |
525 | |
526 | out1: | |
b39297ae TS |
527 | requester_cleanup(); |
528 | CoUninitialize(); | |
529 | } | |
530 | ||
531 | ||
0692b03e | 532 | void requester_thaw(int *num_vols, void *mountpints, ErrorSet *errset) |
b39297ae TS |
533 | { |
534 | COMPointer<IVssAsync> pAsync; | |
535 | ||
4c1b8f1e | 536 | if (!vss_ctx.hEventThaw) { |
b39297ae TS |
537 | /* |
538 | * In this case, DoSnapshotSet is aborted or not started, | |
539 | * and no volumes must be frozen. We return without an error. | |
540 | */ | |
541 | *num_vols = 0; | |
542 | return; | |
543 | } | |
544 | ||
545 | /* Tell the provider that the snapshot is finished. */ | |
546 | SetEvent(vss_ctx.hEventThaw); | |
547 | ||
548 | assert(vss_ctx.pVssbc); | |
549 | assert(vss_ctx.pAsyncSnapshot); | |
550 | ||
551 | HRESULT hr = WaitForAsync(vss_ctx.pAsyncSnapshot); | |
552 | switch (hr) { | |
553 | case VSS_S_ASYNC_FINISHED: | |
554 | hr = vss_ctx.pVssbc->BackupComplete(pAsync.replace()); | |
555 | if (SUCCEEDED(hr)) { | |
556 | hr = WaitForAsync(pAsync); | |
557 | } | |
558 | if (FAILED(hr)) { | |
559 | err_set(errset, hr, "failed to complete backup"); | |
560 | } | |
561 | break; | |
562 | ||
563 | case (HRESULT)VSS_E_OBJECT_NOT_FOUND: | |
564 | /* | |
565 | * On Windows earlier than 2008 SP2 which does not support | |
566 | * VSS_VOLSNAP_ATTR_NO_AUTORECOVERY context, the final commit is not | |
567 | * skipped and VSS is aborted by VSS_E_OBJECT_NOT_FOUND. However, as | |
568 | * the system had been frozen until fsfreeze-thaw command was issued, | |
569 | * we ignore this error. | |
570 | */ | |
571 | vss_ctx.pVssbc->AbortBackup(); | |
572 | break; | |
573 | ||
574 | case VSS_E_UNEXPECTED_PROVIDER_ERROR: | |
575 | if (WaitForSingleObject(vss_ctx.hEventTimeout, 0) != WAIT_OBJECT_0) { | |
576 | err_set(errset, hr, "unexpected error in VSS provider"); | |
577 | break; | |
578 | } | |
579 | /* fall through if hEventTimeout is signaled */ | |
580 | ||
581 | case (HRESULT)VSS_E_HOLD_WRITES_TIMEOUT: | |
582 | err_set(errset, hr, "couldn't hold writes: " | |
583 | "fsfreeze is limited up to 10 seconds"); | |
584 | break; | |
585 | ||
586 | default: | |
587 | err_set(errset, hr, "failed to do snapshot set"); | |
588 | } | |
589 | ||
590 | if (err_is_set(errset)) { | |
591 | vss_ctx.pVssbc->AbortBackup(); | |
592 | } | |
593 | *num_vols = vss_ctx.cFrozenVols; | |
594 | requester_cleanup(); | |
595 | ||
596 | CoUninitialize(); | |
f342cc93 | 597 | StopService(); |
b39297ae | 598 | } |