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1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "Disk.h"
18#include "PublicVolume.h"
19#include "Utils.h"
20#include "VolumeBase.h"
21#include "VolumeManager.h"
22#include "ResponseCode.h"
23
24#include <android-base/file.h>
25#include <android-base/stringprintf.h>
26#include <android-base/logging.h>
27
28#include <vector>
29#include <fcntl.h>
30#include <inttypes.h>
31#include <stdio.h>
32#include <stdlib.h>
33#include <sys/types.h>
34#include <sys/stat.h>
35#include <sys/mount.h>
36#include <sys/sysmacros.h>
37
38using android::base::ReadFileToString;
39using android::base::WriteStringToFile;
40using android::base::StringPrintf;
41
42namespace android {
43namespace droidvold {
44
45static const char* kSgdiskPath = "/system/bin/sgdisk";
46static const char* kSgdiskToken = " \t\n";
47
48static const char* kSysfsMmcMaxMinors = "/sys/module/mmcblk/parameters/perdev_minors";
49
50static const unsigned int kMajorBlockScsiA = 8;
51static const unsigned int kMajorBlockSr = 11;
52static const unsigned int kMajorBlockScsiB = 65;
53static const unsigned int kMajorBlockScsiC = 66;
54static const unsigned int kMajorBlockScsiD = 67;
55static const unsigned int kMajorBlockScsiE = 68;
56static const unsigned int kMajorBlockScsiF = 69;
57static const unsigned int kMajorBlockScsiG = 70;
58static const unsigned int kMajorBlockScsiH = 71;
59static const unsigned int kMajorBlockScsiI = 128;
60static const unsigned int kMajorBlockScsiJ = 129;
61static const unsigned int kMajorBlockScsiK = 130;
62static const unsigned int kMajorBlockScsiL = 131;
63static const unsigned int kMajorBlockScsiM = 132;
64static const unsigned int kMajorBlockScsiN = 133;
65static const unsigned int kMajorBlockScsiO = 134;
66static const unsigned int kMajorBlockScsiP = 135;
67static const unsigned int kMajorBlockMmc = 179;
68static const unsigned int kMajorBlockExperimentalMin = 240;
69static const unsigned int kMajorBlockExperimentalMax = 254;
70
71static const char* kGptBasicData = "EBD0A0A2-B9E5-4433-87C0-68B6B72699C7";
72static const char* kGptAndroidMeta = "19A710A2-B3CA-11E4-B026-10604B889DCF";
73static const char* kGptAndroidExpand = "193D1EA4-B3CA-11E4-B075-10604B889DCF";
74
75enum class Table {
76 kUnknown,
77 kMbr,
78 kGpt,
79};
80
81static bool isVirtioBlkDevice(unsigned int major) {
82 /*
83 * The new emulator's "ranchu" virtual board no longer includes a goldfish
84 * MMC-based SD card device; instead, it emulates SD cards with virtio-blk,
85 * which has been supported by upstream kernel and QEMU for quite a while.
86 * Unfortunately, the virtio-blk block device driver does not use a fixed
87 * major number, but relies on the kernel to assign one from a specific
88 * range of block majors, which are allocated for "LOCAL/EXPERIMENAL USE"
89 * per Documentation/devices.txt. This is true even for the latest Linux
90 * kernel (4.4; see init() in drivers/block/virtio_blk.c).
91 *
92 * This makes it difficult for vold to detect a virtio-blk based SD card.
93 * The current solution checks two conditions (both must be met):
94 *
95 * a) If the running environment is the emulator;
96 * b) If the major number is an experimental block device major number (for
97 * x86/x86_64 3.10 ranchu kernels, virtio-blk always gets major number
98 * 253, but it is safer to match the range than just one value).
99 *
100 * Other conditions could be used, too, e.g. the hardware name should be
101 * "ranchu", the device's sysfs path should end with "/block/vd[d-z]", etc.
102 * But just having a) and b) is enough for now.
103 */
104 return IsRunningInEmulator() && major >= kMajorBlockExperimentalMin
105 && major <= kMajorBlockExperimentalMax;
106}
107
108Disk::Disk(const std::string& eventPath, dev_t device,
109 const std::string& nickname, const std::string& eventName, int flags):
110 mDevice(device), mSize(-1), mNickname(nickname), mFlags(flags), mCreated(
111 false), mJustPartitioned(false) {
112 mId = StringPrintf("disk:%u,%u", major(device), minor(device));
113 mEventPath = eventPath;
114 mDevName = eventName;
115 mSysPath = StringPrintf("/sys/%s", eventPath.c_str());
116 mDevPath = StringPrintf("/dev/block/%s", mDevName.c_str());
117
118 mSrdisk = (!strncmp(nickname.c_str(), "sr", 2)) ? true : false;
119}
120
121Disk::~Disk() {
122 CHECK(!mCreated);
123}
124
125std::shared_ptr<VolumeBase> Disk::findVolume(const std::string& id) {
126 for (auto vol : mVolumes) {
127 if (vol->getId() == id) {
128 return vol;
129 }
130 auto stackedVol = vol->findVolume(id);
131 if (stackedVol != nullptr) {
132 return stackedVol;
133 }
134 }
135 return nullptr;
136}
137
138std::shared_ptr<VolumeBase> Disk::findVolumeByPath(const std::string& path) {
139 for (auto vol : mVolumes) {
140 if (vol->getPath() == path) {
141 return vol;
142 }
143 }
144 return nullptr;
145}
146
147void Disk::listVolumes(VolumeBase::Type type, std::list<std::string>& list) {
148 for (auto vol : mVolumes) {
149 if (vol->getType() == type) {
150 list.push_back(vol->getId());
151 }
152 // TODO: consider looking at stacked volumes
153 }
154}
155
156status_t Disk::create() {
157 CHECK(!mCreated);
158 mCreated = true;
159 notifyEvent(ResponseCode::DiskCreated, StringPrintf("%d", mFlags));
160
161 // do nothing when srdisk is created
162 if (mSrdisk)
163 return OK;
164
165 readDiskMetadata();
166 // sleep 10ms
167 usleep(10000);
168
169 std::string fsType;
170 std::string unused;
171
172 // if no partition, handle here
173 if (ReadPartMetadata(mDevPath, fsType, unused, unused) == OK) {
174 if (!fsType.empty()) {
175 if (VolumeManager::Instance()->getDebug())
176 LOG(DEBUG) << "treat entire disk as partition, devPath=" << mDevPath;
177 createPublicVolume(mDevName, true, 0);
178 }
179 }
180
181 return OK;
182}
183
184status_t Disk::reset() {
185 CHECK(!mCreated);
186 mCreated = true;
187 notifyEvent(ResponseCode::DiskCreated, StringPrintf("%d", mFlags));
188
189 // do nothing when srdisk is created
190 if (mSrdisk)
191 return OK;
192
193 readDiskMetadata();
194
195 if (mPartNo.size() == 0) {
196 createPublicVolume(mDevName, true, 0);
197 } else {
198 std::string partDevName;
199 for (auto part : mPartNo) {
200 if (mFlags & Flags::kUsb)
201 partDevName = StringPrintf("%s%d", mDevName.c_str(), part);
202 else if (mFlags & Flags::kSd)
203 partDevName = StringPrintf("%sp%d", mDevName.c_str(), part);
204
205 createPublicVolume(partDevName, false, part);
206 }
207 }
208
209
210 return OK;
211}
212
213status_t Disk::destroy() {
214 CHECK(mCreated);
215 destroyAllVolumes();
216 notifyEvent(ResponseCode::DiskDestroyed);
217 mCreated = false;
218 return OK;
219}
220
221void Disk::handleJustPublicPhysicalDevice(
222 const std::string& physicalDevName) {
223 auto vol = std::shared_ptr<VolumeBase>(new PublicVolume(physicalDevName, true));
224 if (mJustPartitioned) {
225 LOG(DEBUG) << "Device just partitioned; silently formatting";
226 vol->setSilent(true);
227 vol->create();
228 vol->format("auto");
229 vol->destroy();
230 vol->setSilent(false);
231 }
232
233 mVolumes.push_back(vol);
234 vol->setDiskId(getId());
235 vol->setSysPath(getSysPath());
236 vol->create();
237 //vol->mount();
238}
239
240void Disk::createPublicVolume(const std::string& partDevName,
241 const bool isPhysical, int part) {
242 auto vol = std::shared_ptr<VolumeBase>(new PublicVolume(partDevName, isPhysical));
243 if (mJustPartitioned) {
244 LOG(DEBUG) << "Device just partitioned; silently formatting";
245 vol->setSilent(true);
246 vol->create();
247 vol->format("auto");
248 vol->destroy();
249 vol->setSilent(false);
250 }
251
252 mVolumes.push_back(vol);
253 vol->setDiskId(getId());
254 vol->setSysPath(getSysPath());
255 vol->setDiskFlags(mFlags);
256 vol->setPartNo(part);
257
258 vol->create();
259 //vol->mount();
260}
261
262void Disk::destroyAllVolumes() {
263 for (auto vol : mVolumes) {
264 vol->destroy();
265 }
266 mVolumes.clear();
267}
268
269status_t Disk::readDiskMetadata() {
270 mSize = -1;
271 mLabel.clear();
272
273 int fd = open(mDevPath.c_str(), O_RDONLY | O_CLOEXEC);
274 if (fd != -1) {
275 if (ioctl(fd, BLKGETSIZE64, &mSize)) {
276 mSize = -1;
277 }
278 close(fd);
279 }
280
281 unsigned int majorId = major(mDevice);
282 switch (majorId) {
283 case kMajorBlockSr:
284 case kMajorBlockScsiA: case kMajorBlockScsiB: case kMajorBlockScsiC: case kMajorBlockScsiD:
285 case kMajorBlockScsiE: case kMajorBlockScsiF: case kMajorBlockScsiG: case kMajorBlockScsiH:
286 case kMajorBlockScsiI: case kMajorBlockScsiJ: case kMajorBlockScsiK: case kMajorBlockScsiL:
287 case kMajorBlockScsiM: case kMajorBlockScsiN: case kMajorBlockScsiO: case kMajorBlockScsiP: {
288 std::string path(mSysPath + "/device/vendor");
289 std::string tmp;
290 if (!ReadFileToString(path, &tmp)) {
291 PLOG(WARNING) << "Failed to read vendor from " << path;
292 return -errno;
293 }
294 mLabel = tmp;
295 break;
296 }
297 case kMajorBlockMmc: {
298 std::string path(mSysPath + "/device/manfid");
299 std::string tmp;
300 if (!ReadFileToString(path, &tmp)) {
301 PLOG(WARNING) << "Failed to read manufacturer from " << path;
302 return -errno;
303 }
304 uint64_t manfid = strtoll(tmp.c_str(), nullptr, 16);
305 // Our goal here is to give the user a meaningful label, ideally
306 // matching whatever is silk-screened on the card. To reduce
307 // user confusion, this list doesn't contain white-label manfid.
308 switch (manfid) {
309 case 0x000003: mLabel = "SanDisk"; break;
310 case 0x00001b: mLabel = "Samsung"; break;
311 case 0x000028: mLabel = "Lexar"; break;
312 case 0x000074: mLabel = "Transcend"; break;
313 }
314 break;
315 }
316 default: {
317 if (isVirtioBlkDevice(majorId)) {
318 LOG(DEBUG) << "Recognized experimental block major ID " << majorId
319 << " as virtio-blk (emulator's virtual SD card device)";
320 mLabel = "Virtual";
321 break;
322 }
323 LOG(WARNING) << "Unsupported block major type " << majorId;
324 return -ENOTSUP;
325 }
326 }
327
328 notifyEvent(ResponseCode::DiskSizeChanged, StringPrintf("%" PRIu64, mSize));
329 notifyEvent(ResponseCode::DiskLabelChanged, mLabel);
330 notifyEvent(ResponseCode::DiskSysPathChanged, mSysPath);
331 return OK;
332}
333
334void Disk::handleBlockEvent(NetlinkEvent *evt) {
335 std::string eventPath(evt->findParam("DEVPATH")?evt->findParam("DEVPATH"):"");
336 std::string devName(evt->findParam("DEVNAME")?evt->findParam("DEVNAME"):"");
337 std::string devType(evt->findParam("DEVTYPE")?evt->findParam("DEVTYPE"):"");
338
339 // can we handle this event
340 if (eventPath.find(mEventPath) == std::string::npos) {
341 LOG(DEBUG) << "evt will handle by other disk " << mEventPath;
342 return;
343 }
344
345 if (devType != "partition") {
346 LOG(DEBUG) << "evt type is not partition " << devType;
347 evt->dump();
348 return;
349 }
350
351 std::string partDevName;
352 switch (evt->getAction()) {
353 case NetlinkEvent::Action::kAdd: {
354 int part = atoi(evt->findParam("PARTN"));
355
356 mPartNo.push_back(part);
357 if (mFlags & Flags::kUsb)
358 partDevName = StringPrintf("%s%d", mDevName.c_str(), part);
359 else if (mFlags & Flags::kSd)
360 partDevName = StringPrintf("%sp%d", mDevName.c_str(), part);
361
362 LOG(INFO) << " partDevName =" << partDevName;
363 createPublicVolume(partDevName, false, part);
364 break;
365 }
366 case NetlinkEvent::Action::kChange: {
367 // ignore
368 LOG(DEBUG) << "Disk at " << mDevPath << " changed";
369 break;
370 }
371 case NetlinkEvent::Action::kRemove: {
372 // will handle by vm
373 break;
374 }
375 default: {
376 LOG(WARNING) << "Unexpected block event action " << (int) evt->getAction();
377 break;
378 }
379 }
380}
381
382#if 0
383status_t Disk::readPartitions() {
384 if (mSrdisk) {
385 // srdisk has no partiton concept.
386 LOG(INFO) << "srdisk try entire disk as fake partition";
387 //createPublicVolume(mDevice);
388 return OK;
389 }
390
391 int8_t maxMinors = getMaxMinors();
392 if (maxMinors < 0) {
393 return -ENOTSUP;
394 }
395
396 destroyAllVolumes();
397
398 // Parse partition table
399
400 std::vector<std::string> cmd;
401 cmd.push_back(kSgdiskPath);
402 cmd.push_back("--android-dump");
403 cmd.push_back(mDevPath);
404
405 std::vector<std::string> output;
406 status_t res = ForkExecvp(cmd, output);
407 if (res != OK) {
408 LOG(WARNING) << "sgdisk failed to scan " << mDevPath;
409 notifyEvent(ResponseCode::DiskScanned);
410 mJustPartitioned = false;
411 return res;
412 }
413
414 Table table = Table::kUnknown;
415 bool foundParts = false;
416 std::string physicalDevName, partDevName;
417 for (auto line : output) {
418 char* cline = (char*) line.c_str();
419 char* token = strtok(cline, kSgdiskToken);
420 if (token == nullptr) continue;
421
422 if (!strcmp(token, "DISK")) {
423 const char* type = strtok(nullptr, kSgdiskToken);
424 if (!strcmp(type, "mbr")) {
425 table = Table::kMbr;
426 } else if (!strcmp(type, "gpt")) {
427 table = Table::kGpt;
428 }
429 } else if (!strcmp(token, "PART")) {
430 foundParts = true;
431 int i = strtol(strtok(nullptr, kSgdiskToken), nullptr, 10);
432 if (i <= 0 || i > maxMinors) {
433 LOG(WARNING) << mId << " is ignoring partition " << i
434 << " beyond max supported devices";
435 continue;
436 }
437 dev_t partDevice = makedev(major(mDevice), minor(mDevice) + i);
438
439 if (mFlags & Flags::kUsb)
440 partDevName = StringPrintf("%s%d", mDevName.c_str(), i);
441 else if (mFlags & Flags::kSd)
442 partDevName = StringPrintf("%sp%d", mDevName.c_str(), i);
443 LOG(INFO) << " partDevName =" << partDevName;
444
445 if (table == Table::kMbr) {
446 const char* type = strtok(nullptr, kSgdiskToken);
447
448 if (IsJustPhysicalDevice(mSysPath, physicalDevName)) {
449 LOG(INFO) << " here,we don't create public:xx,xx for physical device only!";
450 handleJustPublicPhysicalDevice(physicalDevName);
451 break;
452 }
453
454 // support mort than 16 partitions
455 if (i > 15)
456 getPhysicalDev(partDevice, mSysPath, i);
457
458 switch (strtol(type, nullptr, 16)) {
459 case 0x06: // FAT16
460 case 0x0b: // W95 FAT32 (LBA)
461 case 0x0c: // W95 FAT32 (LBA)
462 case 0x0e: // W95 FAT16 (LBA)
463
464 case 0x07: // NTFS & EXFAT
465 createPublicVolume(partDevName, false);
466 break;
467
468 default:
469 // We should still create public volume here
470 // cause some disk table types are not matched above
471 // but can be mounted successfully
472 createPublicVolume(partDevName, false);
473 LOG(WARNING) << "unsupported table kMbr type " << type;
474 break;
475 }
476 } else if (table == Table::kGpt) {
477 const char* typeGuid = strtok(nullptr, kSgdiskToken);
478 const char* partGuid = strtok(nullptr, kSgdiskToken);
479
480 if (!strcasecmp(typeGuid, kGptBasicData)) {
481 createPublicVolume(partDevName, false);
482 }
483 }
484 }
485 }
486
487 // Ugly last ditch effort, treat entire disk as partition
488 if (table == Table::kUnknown || !foundParts) {
489 LOG(WARNING) << mId << " has unknown partition table; trying entire device";
490
491 std::string fsType;
492 std::string unused;
493 if (ReadPartMetadata(mDevPath, fsType, unused, unused) == OK) {
494 if (IsJustPhysicalDevice(mSysPath, physicalDevName)) {
495 handleJustPublicPhysicalDevice(physicalDevName);
496 } else {
497 createPublicVolume(partDevName, false);
498 }
499 } else {
500 LOG(WARNING) << mId << " failed to identify, giving up";
501 }
502 }
503
504 notifyEvent(ResponseCode::DiskScanned);
505 mJustPartitioned = false;
506 return OK;
507}
508#endif
509
510status_t Disk::unmountAll() {
511 for (auto vol : mVolumes) {
512 vol->unmount();
513 }
514 return OK;
515}
516
517void Disk::notifyEvent(int event) {
518 VolumeManager::Instance()->getBroadcaster()->sendBroadcast(event,
519 getId());
520}
521
522void Disk::notifyEvent(int event, const std::string& value) {
523 VolumeManager::Instance()->getBroadcaster()->sendBroadcast(event,
524 StringPrintf("%s %s", getId().c_str(), value.c_str()));
525}
526
527
528bool Disk::isSrdiskMounted() {
529 if (!mSrdisk) {
530 return false;
531 }
532
533 for (auto vol : mVolumes) {
534 return vol->isSrdiskMounted();
535 }
536
537 return false;
538}
539
540int Disk::getMaxMinors() {
541 // Figure out maximum partition devices supported
542 unsigned int majorId = major(mDevice);
543 switch (majorId) {
544 case kMajorBlockScsiA: case kMajorBlockScsiB: case kMajorBlockScsiC: case kMajorBlockScsiD:
545 case kMajorBlockScsiE: case kMajorBlockScsiF: case kMajorBlockScsiG: case kMajorBlockScsiH:
546 case kMajorBlockScsiI: case kMajorBlockScsiJ: case kMajorBlockScsiK: case kMajorBlockScsiL:
547 case kMajorBlockScsiM: case kMajorBlockScsiN: case kMajorBlockScsiO: case kMajorBlockScsiP: {
548 // Per Documentation/devices.txt this is static
549 return 31;
550 }
551 case kMajorBlockMmc: {
552 // Per Documentation/devices.txt this is dynamic
553 std::string tmp;
554 if (!ReadFileToString(kSysfsMmcMaxMinors, &tmp)) {
555 LOG(ERROR) << "Failed to read max minors";
556 return -errno;
557 }
558 return atoi(tmp.c_str());
559 }
560 default: {
561 if (isVirtioBlkDevice(majorId)) {
562 // drivers/block/virtio_blk.c has "#define PART_BITS 4", so max is
563 // 2^4 - 1 = 15
564 return 15;
565 }
566 }
567 }
568
569 LOG(ERROR) << "Unsupported block major type " << majorId;
570 return -ENOTSUP;
571}
572
573void Disk::getPhysicalDev(dev_t &device, const std:: string& sysPath, int part) {
574 std::string smajor, sminor;
575 std::string physicalDev, lpDev;
576 int major, minor;
577
578 if (part <= 15)
579 return;
580
581 if (GetPhysicalDevice(sysPath, physicalDev) == OK) {
582 lpDev = StringPrintf("%s%d", physicalDev.c_str(), part);
583 if (!access(lpDev.c_str(), F_OK) &&
584 readBlockDevMajorAndMinor(lpDev, smajor, sminor) == OK) {
585 major = atoi(smajor.c_str());
586 minor = atoi(sminor.c_str());
587 device = makedev(major, minor);
588 }
589 }
590}
591
592} // namespace vold
593} // namespace android
594
generated by cgit at 2024-05-18 16:38:16 (GMT)