VolumeManager.cpp revision a976656ff90291b9437a4d37b48e82abcd48195e
1/* 2 * Copyright (C) 2008 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 <stdio.h> 18#include <stdlib.h> 19#include <string.h> 20#include <errno.h> 21#include <fcntl.h> 22#include <sys/stat.h> 23#include <sys/types.h> 24#include <sys/mount.h> 25 26#include <linux/kdev_t.h> 27 28#define LOG_TAG "Vold" 29 30#include <openssl/md5.h> 31 32#include <cutils/log.h> 33 34#include <sysutils/NetlinkEvent.h> 35 36#include "VolumeManager.h" 37#include "DirectVolume.h" 38#include "ResponseCode.h" 39#include "Loop.h" 40#include "Fat.h" 41#include "Devmapper.h" 42#include "Process.h" 43#include "Asec.h" 44#include "cryptfs.h" 45 46VolumeManager *VolumeManager::sInstance = NULL; 47 48VolumeManager *VolumeManager::Instance() { 49 if (!sInstance) 50 sInstance = new VolumeManager(); 51 return sInstance; 52} 53 54VolumeManager::VolumeManager() { 55 mDebug = false; 56 mVolumes = new VolumeCollection(); 57 mActiveContainers = new AsecIdCollection(); 58 mBroadcaster = NULL; 59 mUmsSharingCount = 0; 60 mSavedDirtyRatio = -1; 61 // set dirty ratio to 0 when UMS is active 62 mUmsDirtyRatio = 0; 63} 64 65VolumeManager::~VolumeManager() { 66 delete mVolumes; 67 delete mActiveContainers; 68} 69 70char *VolumeManager::asecHash(const char *id, char *buffer, size_t len) { 71 static const char* digits = "0123456789abcdef"; 72 73 unsigned char sig[MD5_DIGEST_LENGTH]; 74 75 if (buffer == NULL) { 76 SLOGE("Destination buffer is NULL"); 77 errno = ESPIPE; 78 return NULL; 79 } else if (id == NULL) { 80 SLOGE("Source buffer is NULL"); 81 errno = ESPIPE; 82 return NULL; 83 } else if (len < MD5_ASCII_LENGTH_PLUS_NULL) { 84 SLOGE("Target hash buffer size < %d bytes (%d)", 85 MD5_ASCII_LENGTH_PLUS_NULL, len); 86 errno = ESPIPE; 87 return NULL; 88 } 89 90 MD5(reinterpret_cast<const unsigned char*>(id), strlen(id), sig); 91 92 char *p = buffer; 93 for (int i = 0; i < MD5_DIGEST_LENGTH; i++) { 94 *p++ = digits[sig[i] >> 4]; 95 *p++ = digits[sig[i] & 0x0F]; 96 } 97 *p = '\0'; 98 99 return buffer; 100} 101 102void VolumeManager::setDebug(bool enable) { 103 mDebug = enable; 104 VolumeCollection::iterator it; 105 for (it = mVolumes->begin(); it != mVolumes->end(); ++it) { 106 (*it)->setDebug(enable); 107 } 108} 109 110int VolumeManager::start() { 111 return 0; 112} 113 114int VolumeManager::stop() { 115 return 0; 116} 117 118int VolumeManager::addVolume(Volume *v) { 119 mVolumes->push_back(v); 120 return 0; 121} 122 123void VolumeManager::handleBlockEvent(NetlinkEvent *evt) { 124 const char *devpath = evt->findParam("DEVPATH"); 125 126 /* Lookup a volume to handle this device */ 127 VolumeCollection::iterator it; 128 bool hit = false; 129 for (it = mVolumes->begin(); it != mVolumes->end(); ++it) { 130 if (!(*it)->handleBlockEvent(evt)) { 131#ifdef NETLINK_DEBUG 132 SLOGD("Device '%s' event handled by volume %s\n", devpath, (*it)->getLabel()); 133#endif 134 hit = true; 135 break; 136 } 137 } 138 139 if (!hit) { 140#ifdef NETLINK_DEBUG 141 SLOGW("No volumes handled block event for '%s'", devpath); 142#endif 143 } 144} 145 146int VolumeManager::listVolumes(SocketClient *cli) { 147 VolumeCollection::iterator i; 148 149 for (i = mVolumes->begin(); i != mVolumes->end(); ++i) { 150 char *buffer; 151 asprintf(&buffer, "%s %s %d", 152 (*i)->getLabel(), (*i)->getMountpoint(), 153 (*i)->getState()); 154 cli->sendMsg(ResponseCode::VolumeListResult, buffer, false); 155 free(buffer); 156 } 157 cli->sendMsg(ResponseCode::CommandOkay, "Volumes listed.", false); 158 return 0; 159} 160 161int VolumeManager::formatVolume(const char *label) { 162 Volume *v = lookupVolume(label); 163 164 if (!v) { 165 errno = ENOENT; 166 return -1; 167 } 168 169 return v->formatVol(); 170} 171 172int VolumeManager::getObbMountPath(const char *sourceFile, char *mountPath, int mountPathLen) { 173 char idHash[33]; 174 if (!asecHash(sourceFile, idHash, sizeof(idHash))) { 175 SLOGE("Hash of '%s' failed (%s)", sourceFile, strerror(errno)); 176 return -1; 177 } 178 179 memset(mountPath, 0, mountPathLen); 180 snprintf(mountPath, mountPathLen, "%s/%s", Volume::LOOPDIR, idHash); 181 182 if (access(mountPath, F_OK)) { 183 errno = ENOENT; 184 return -1; 185 } 186 187 return 0; 188} 189 190int VolumeManager::getAsecMountPath(const char *id, char *buffer, int maxlen) { 191 char asecFileName[255]; 192 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 193 194 memset(buffer, 0, maxlen); 195 if (access(asecFileName, F_OK)) { 196 errno = ENOENT; 197 return -1; 198 } 199 200 snprintf(buffer, maxlen, "%s/%s", Volume::ASECDIR, id); 201 return 0; 202} 203 204int VolumeManager::createAsec(const char *id, unsigned int numSectors, 205 const char *fstype, const char *key, int ownerUid) { 206 struct asec_superblock sb; 207 memset(&sb, 0, sizeof(sb)); 208 209 sb.magic = ASEC_SB_MAGIC; 210 sb.ver = ASEC_SB_VER; 211 212 if (numSectors < ((1024*1024)/512)) { 213 SLOGE("Invalid container size specified (%d sectors)", numSectors); 214 errno = EINVAL; 215 return -1; 216 } 217 218 if (lookupVolume(id)) { 219 SLOGE("ASEC id '%s' currently exists", id); 220 errno = EADDRINUSE; 221 return -1; 222 } 223 224 char asecFileName[255]; 225 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 226 227 if (!access(asecFileName, F_OK)) { 228 SLOGE("ASEC file '%s' currently exists - destroy it first! (%s)", 229 asecFileName, strerror(errno)); 230 errno = EADDRINUSE; 231 return -1; 232 } 233 234 /* 235 * Add some headroom 236 */ 237 unsigned fatSize = (((numSectors * 4) / 512) + 1) * 2; 238 unsigned numImgSectors = numSectors + fatSize + 2; 239 240 if (numImgSectors % 63) { 241 numImgSectors += (63 - (numImgSectors % 63)); 242 } 243 244 // Add +1 for our superblock which is at the end 245 if (Loop::createImageFile(asecFileName, numImgSectors + 1)) { 246 SLOGE("ASEC image file creation failed (%s)", strerror(errno)); 247 return -1; 248 } 249 250 char idHash[33]; 251 if (!asecHash(id, idHash, sizeof(idHash))) { 252 SLOGE("Hash of '%s' failed (%s)", id, strerror(errno)); 253 unlink(asecFileName); 254 return -1; 255 } 256 257 char loopDevice[255]; 258 if (Loop::create(idHash, asecFileName, loopDevice, sizeof(loopDevice))) { 259 SLOGE("ASEC loop device creation failed (%s)", strerror(errno)); 260 unlink(asecFileName); 261 return -1; 262 } 263 264 char dmDevice[255]; 265 bool cleanupDm = false; 266 267 if (strcmp(key, "none")) { 268 // XXX: This is all we support for now 269 sb.c_cipher = ASEC_SB_C_CIPHER_TWOFISH; 270 if (Devmapper::create(idHash, loopDevice, key, numImgSectors, dmDevice, 271 sizeof(dmDevice))) { 272 SLOGE("ASEC device mapping failed (%s)", strerror(errno)); 273 Loop::destroyByDevice(loopDevice); 274 unlink(asecFileName); 275 return -1; 276 } 277 cleanupDm = true; 278 } else { 279 sb.c_cipher = ASEC_SB_C_CIPHER_NONE; 280 strcpy(dmDevice, loopDevice); 281 } 282 283 /* 284 * Drop down the superblock at the end of the file 285 */ 286 287 int sbfd = open(loopDevice, O_RDWR); 288 if (sbfd < 0) { 289 SLOGE("Failed to open new DM device for superblock write (%s)", strerror(errno)); 290 if (cleanupDm) { 291 Devmapper::destroy(idHash); 292 } 293 Loop::destroyByDevice(loopDevice); 294 unlink(asecFileName); 295 return -1; 296 } 297 298 if (lseek(sbfd, (numImgSectors * 512), SEEK_SET) < 0) { 299 close(sbfd); 300 SLOGE("Failed to lseek for superblock (%s)", strerror(errno)); 301 if (cleanupDm) { 302 Devmapper::destroy(idHash); 303 } 304 Loop::destroyByDevice(loopDevice); 305 unlink(asecFileName); 306 return -1; 307 } 308 309 if (write(sbfd, &sb, sizeof(sb)) != sizeof(sb)) { 310 close(sbfd); 311 SLOGE("Failed to write superblock (%s)", strerror(errno)); 312 if (cleanupDm) { 313 Devmapper::destroy(idHash); 314 } 315 Loop::destroyByDevice(loopDevice); 316 unlink(asecFileName); 317 return -1; 318 } 319 close(sbfd); 320 321 if (strcmp(fstype, "none")) { 322 if (strcmp(fstype, "fat")) { 323 SLOGW("Unknown fstype '%s' specified for container", fstype); 324 } 325 326 if (Fat::format(dmDevice, numImgSectors)) { 327 SLOGE("ASEC FAT format failed (%s)", strerror(errno)); 328 if (cleanupDm) { 329 Devmapper::destroy(idHash); 330 } 331 Loop::destroyByDevice(loopDevice); 332 unlink(asecFileName); 333 return -1; 334 } 335 char mountPoint[255]; 336 337 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); 338 if (mkdir(mountPoint, 0777)) { 339 if (errno != EEXIST) { 340 SLOGE("Mountpoint creation failed (%s)", strerror(errno)); 341 if (cleanupDm) { 342 Devmapper::destroy(idHash); 343 } 344 Loop::destroyByDevice(loopDevice); 345 unlink(asecFileName); 346 return -1; 347 } 348 } 349 350 if (Fat::doMount(dmDevice, mountPoint, false, false, false, ownerUid, 351 0, 0000, false)) { 352 SLOGE("ASEC FAT mount failed (%s)", strerror(errno)); 353 if (cleanupDm) { 354 Devmapper::destroy(idHash); 355 } 356 Loop::destroyByDevice(loopDevice); 357 unlink(asecFileName); 358 return -1; 359 } 360 } else { 361 SLOGI("Created raw secure container %s (no filesystem)", id); 362 } 363 364 mActiveContainers->push_back(new ContainerData(strdup(id), ASEC)); 365 return 0; 366} 367 368int VolumeManager::finalizeAsec(const char *id) { 369 char asecFileName[255]; 370 char loopDevice[255]; 371 char mountPoint[255]; 372 373 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 374 375 char idHash[33]; 376 if (!asecHash(id, idHash, sizeof(idHash))) { 377 SLOGE("Hash of '%s' failed (%s)", id, strerror(errno)); 378 return -1; 379 } 380 381 if (Loop::lookupActive(idHash, loopDevice, sizeof(loopDevice))) { 382 SLOGE("Unable to finalize %s (%s)", id, strerror(errno)); 383 return -1; 384 } 385 386 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); 387 // XXX: 388 if (Fat::doMount(loopDevice, mountPoint, true, true, true, 0, 0, 0227, false)) { 389 SLOGE("ASEC finalize mount failed (%s)", strerror(errno)); 390 return -1; 391 } 392 393 if (mDebug) { 394 SLOGD("ASEC %s finalized", id); 395 } 396 return 0; 397} 398 399int VolumeManager::renameAsec(const char *id1, const char *id2) { 400 char *asecFilename1; 401 char *asecFilename2; 402 char mountPoint[255]; 403 404 asprintf(&asecFilename1, "%s/%s.asec", Volume::SEC_ASECDIR, id1); 405 asprintf(&asecFilename2, "%s/%s.asec", Volume::SEC_ASECDIR, id2); 406 407 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id1); 408 if (isMountpointMounted(mountPoint)) { 409 SLOGW("Rename attempt when src mounted"); 410 errno = EBUSY; 411 goto out_err; 412 } 413 414 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id2); 415 if (isMountpointMounted(mountPoint)) { 416 SLOGW("Rename attempt when dst mounted"); 417 errno = EBUSY; 418 goto out_err; 419 } 420 421 if (!access(asecFilename2, F_OK)) { 422 SLOGE("Rename attempt when dst exists"); 423 errno = EADDRINUSE; 424 goto out_err; 425 } 426 427 if (rename(asecFilename1, asecFilename2)) { 428 SLOGE("Rename of '%s' to '%s' failed (%s)", asecFilename1, asecFilename2, strerror(errno)); 429 goto out_err; 430 } 431 432 free(asecFilename1); 433 free(asecFilename2); 434 return 0; 435 436out_err: 437 free(asecFilename1); 438 free(asecFilename2); 439 return -1; 440} 441 442#define UNMOUNT_RETRIES 5 443#define UNMOUNT_SLEEP_BETWEEN_RETRY_MS (1000 * 1000) 444int VolumeManager::unmountAsec(const char *id, bool force) { 445 char asecFileName[255]; 446 char mountPoint[255]; 447 448 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 449 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); 450 451 char idHash[33]; 452 if (!asecHash(id, idHash, sizeof(idHash))) { 453 SLOGE("Hash of '%s' failed (%s)", id, strerror(errno)); 454 return -1; 455 } 456 457 return unmountLoopImage(id, idHash, asecFileName, mountPoint, force); 458} 459 460int VolumeManager::unmountObb(const char *fileName, bool force) { 461 char mountPoint[255]; 462 463 char idHash[33]; 464 if (!asecHash(fileName, idHash, sizeof(idHash))) { 465 SLOGE("Hash of '%s' failed (%s)", fileName, strerror(errno)); 466 return -1; 467 } 468 469 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::LOOPDIR, idHash); 470 471 return unmountLoopImage(fileName, idHash, fileName, mountPoint, force); 472} 473 474int VolumeManager::unmountLoopImage(const char *id, const char *idHash, 475 const char *fileName, const char *mountPoint, bool force) { 476 if (!isMountpointMounted(mountPoint)) { 477 SLOGE("Unmount request for %s when not mounted", id); 478 errno = ENOENT; 479 return -1; 480 } 481 482 int i, rc; 483 for (i = 1; i <= UNMOUNT_RETRIES; i++) { 484 rc = umount(mountPoint); 485 if (!rc) { 486 break; 487 } 488 if (rc && (errno == EINVAL || errno == ENOENT)) { 489 SLOGI("Container %s unmounted OK", id); 490 rc = 0; 491 break; 492 } 493 SLOGW("%s unmount attempt %d failed (%s)", 494 id, i, strerror(errno)); 495 496 int action = 0; // default is to just complain 497 498 if (force) { 499 if (i > (UNMOUNT_RETRIES - 2)) 500 action = 2; // SIGKILL 501 else if (i > (UNMOUNT_RETRIES - 3)) 502 action = 1; // SIGHUP 503 } 504 505 Process::killProcessesWithOpenFiles(mountPoint, action); 506 usleep(UNMOUNT_SLEEP_BETWEEN_RETRY_MS); 507 } 508 509 if (rc) { 510 errno = EBUSY; 511 SLOGE("Failed to unmount container %s (%s)", id, strerror(errno)); 512 return -1; 513 } 514 515 int retries = 10; 516 517 while(retries--) { 518 if (!rmdir(mountPoint)) { 519 break; 520 } 521 522 SLOGW("Failed to rmdir %s (%s)", mountPoint, strerror(errno)); 523 usleep(UNMOUNT_SLEEP_BETWEEN_RETRY_MS); 524 } 525 526 if (!retries) { 527 SLOGE("Timed out trying to rmdir %s (%s)", mountPoint, strerror(errno)); 528 } 529 530 if (Devmapper::destroy(idHash) && errno != ENXIO) { 531 SLOGE("Failed to destroy devmapper instance (%s)", strerror(errno)); 532 } 533 534 char loopDevice[255]; 535 if (!Loop::lookupActive(idHash, loopDevice, sizeof(loopDevice))) { 536 Loop::destroyByDevice(loopDevice); 537 } else { 538 SLOGW("Failed to find loop device for {%s} (%s)", fileName, strerror(errno)); 539 } 540 541 AsecIdCollection::iterator it; 542 for (it = mActiveContainers->begin(); it != mActiveContainers->end(); ++it) { 543 ContainerData* cd = *it; 544 if (!strcmp(cd->id, id)) { 545 free(*it); 546 mActiveContainers->erase(it); 547 break; 548 } 549 } 550 if (it == mActiveContainers->end()) { 551 SLOGW("mActiveContainers is inconsistent!"); 552 } 553 return 0; 554} 555 556int VolumeManager::destroyAsec(const char *id, bool force) { 557 char asecFileName[255]; 558 char mountPoint[255]; 559 560 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 561 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); 562 563 if (isMountpointMounted(mountPoint)) { 564 if (mDebug) { 565 SLOGD("Unmounting container before destroy"); 566 } 567 if (unmountAsec(id, force)) { 568 SLOGE("Failed to unmount asec %s for destroy (%s)", id, strerror(errno)); 569 return -1; 570 } 571 } 572 573 if (unlink(asecFileName)) { 574 SLOGE("Failed to unlink asec '%s' (%s)", asecFileName, strerror(errno)); 575 return -1; 576 } 577 578 if (mDebug) { 579 SLOGD("ASEC %s destroyed", id); 580 } 581 return 0; 582} 583 584int VolumeManager::mountAsec(const char *id, const char *key, int ownerUid) { 585 char asecFileName[255]; 586 char mountPoint[255]; 587 588 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 589 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); 590 591 if (isMountpointMounted(mountPoint)) { 592 SLOGE("ASEC %s already mounted", id); 593 errno = EBUSY; 594 return -1; 595 } 596 597 char idHash[33]; 598 if (!asecHash(id, idHash, sizeof(idHash))) { 599 SLOGE("Hash of '%s' failed (%s)", id, strerror(errno)); 600 return -1; 601 } 602 603 char loopDevice[255]; 604 if (Loop::lookupActive(idHash, loopDevice, sizeof(loopDevice))) { 605 if (Loop::create(idHash, asecFileName, loopDevice, sizeof(loopDevice))) { 606 SLOGE("ASEC loop device creation failed (%s)", strerror(errno)); 607 return -1; 608 } 609 if (mDebug) { 610 SLOGD("New loop device created at %s", loopDevice); 611 } 612 } else { 613 if (mDebug) { 614 SLOGD("Found active loopback for %s at %s", asecFileName, loopDevice); 615 } 616 } 617 618 char dmDevice[255]; 619 bool cleanupDm = false; 620 int fd; 621 unsigned int nr_sec = 0; 622 623 if ((fd = open(loopDevice, O_RDWR)) < 0) { 624 SLOGE("Failed to open loopdevice (%s)", strerror(errno)); 625 Loop::destroyByDevice(loopDevice); 626 return -1; 627 } 628 629 if (ioctl(fd, BLKGETSIZE, &nr_sec)) { 630 SLOGE("Failed to get loop size (%s)", strerror(errno)); 631 Loop::destroyByDevice(loopDevice); 632 close(fd); 633 return -1; 634 } 635 636 /* 637 * Validate superblock 638 */ 639 struct asec_superblock sb; 640 memset(&sb, 0, sizeof(sb)); 641 if (lseek(fd, ((nr_sec-1) * 512), SEEK_SET) < 0) { 642 SLOGE("lseek failed (%s)", strerror(errno)); 643 close(fd); 644 Loop::destroyByDevice(loopDevice); 645 return -1; 646 } 647 if (read(fd, &sb, sizeof(sb)) != sizeof(sb)) { 648 SLOGE("superblock read failed (%s)", strerror(errno)); 649 close(fd); 650 Loop::destroyByDevice(loopDevice); 651 return -1; 652 } 653 654 close(fd); 655 656 if (mDebug) { 657 SLOGD("Container sb magic/ver (%.8x/%.2x)", sb.magic, sb.ver); 658 } 659 if (sb.magic != ASEC_SB_MAGIC || sb.ver != ASEC_SB_VER) { 660 SLOGE("Bad container magic/version (%.8x/%.2x)", sb.magic, sb.ver); 661 Loop::destroyByDevice(loopDevice); 662 errno = EMEDIUMTYPE; 663 return -1; 664 } 665 nr_sec--; // We don't want the devmapping to extend onto our superblock 666 667 if (strcmp(key, "none")) { 668 if (Devmapper::lookupActive(idHash, dmDevice, sizeof(dmDevice))) { 669 if (Devmapper::create(idHash, loopDevice, key, nr_sec, 670 dmDevice, sizeof(dmDevice))) { 671 SLOGE("ASEC device mapping failed (%s)", strerror(errno)); 672 Loop::destroyByDevice(loopDevice); 673 return -1; 674 } 675 if (mDebug) { 676 SLOGD("New devmapper instance created at %s", dmDevice); 677 } 678 } else { 679 if (mDebug) { 680 SLOGD("Found active devmapper for %s at %s", asecFileName, dmDevice); 681 } 682 } 683 cleanupDm = true; 684 } else { 685 strcpy(dmDevice, loopDevice); 686 } 687 688 if (mkdir(mountPoint, 0777)) { 689 if (errno != EEXIST) { 690 SLOGE("Mountpoint creation failed (%s)", strerror(errno)); 691 if (cleanupDm) { 692 Devmapper::destroy(idHash); 693 } 694 Loop::destroyByDevice(loopDevice); 695 return -1; 696 } 697 } 698 699 if (Fat::doMount(dmDevice, mountPoint, true, false, true, ownerUid, 0, 700 0222, false)) { 701// 0227, false)) { 702 SLOGE("ASEC mount failed (%s)", strerror(errno)); 703 if (cleanupDm) { 704 Devmapper::destroy(idHash); 705 } 706 Loop::destroyByDevice(loopDevice); 707 return -1; 708 } 709 710 mActiveContainers->push_back(new ContainerData(strdup(id), ASEC)); 711 if (mDebug) { 712 SLOGD("ASEC %s mounted", id); 713 } 714 return 0; 715} 716 717/** 718 * Mounts an image file <code>img</code>. 719 */ 720int VolumeManager::mountObb(const char *img, const char *key, int ownerUid) { 721 char mountPoint[255]; 722 723 char idHash[33]; 724 if (!asecHash(img, idHash, sizeof(idHash))) { 725 SLOGE("Hash of '%s' failed (%s)", img, strerror(errno)); 726 return -1; 727 } 728 729 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::LOOPDIR, idHash); 730 731 if (isMountpointMounted(mountPoint)) { 732 SLOGE("Image %s already mounted", img); 733 errno = EBUSY; 734 return -1; 735 } 736 737 char loopDevice[255]; 738 if (Loop::lookupActive(idHash, loopDevice, sizeof(loopDevice))) { 739 if (Loop::create(idHash, img, loopDevice, sizeof(loopDevice))) { 740 SLOGE("Image loop device creation failed (%s)", strerror(errno)); 741 return -1; 742 } 743 if (mDebug) { 744 SLOGD("New loop device created at %s", loopDevice); 745 } 746 } else { 747 if (mDebug) { 748 SLOGD("Found active loopback for %s at %s", img, loopDevice); 749 } 750 } 751 752 char dmDevice[255]; 753 bool cleanupDm = false; 754 int fd; 755 unsigned int nr_sec = 0; 756 757 if ((fd = open(loopDevice, O_RDWR)) < 0) { 758 SLOGE("Failed to open loopdevice (%s)", strerror(errno)); 759 Loop::destroyByDevice(loopDevice); 760 return -1; 761 } 762 763 if (ioctl(fd, BLKGETSIZE, &nr_sec)) { 764 SLOGE("Failed to get loop size (%s)", strerror(errno)); 765 Loop::destroyByDevice(loopDevice); 766 close(fd); 767 return -1; 768 } 769 770 close(fd); 771 772 if (strcmp(key, "none")) { 773 if (Devmapper::lookupActive(idHash, dmDevice, sizeof(dmDevice))) { 774 if (Devmapper::create(idHash, loopDevice, key, nr_sec, 775 dmDevice, sizeof(dmDevice))) { 776 SLOGE("ASEC device mapping failed (%s)", strerror(errno)); 777 Loop::destroyByDevice(loopDevice); 778 return -1; 779 } 780 if (mDebug) { 781 SLOGD("New devmapper instance created at %s", dmDevice); 782 } 783 } else { 784 if (mDebug) { 785 SLOGD("Found active devmapper for %s at %s", img, dmDevice); 786 } 787 } 788 cleanupDm = true; 789 } else { 790 strcpy(dmDevice, loopDevice); 791 } 792 793 if (mkdir(mountPoint, 0755)) { 794 if (errno != EEXIST) { 795 SLOGE("Mountpoint creation failed (%s)", strerror(errno)); 796 if (cleanupDm) { 797 Devmapper::destroy(idHash); 798 } 799 Loop::destroyByDevice(loopDevice); 800 return -1; 801 } 802 } 803 804 if (Fat::doMount(dmDevice, mountPoint, true, false, true, ownerUid, 0, 805 0227, false)) { 806 SLOGE("Image mount failed (%s)", strerror(errno)); 807 if (cleanupDm) { 808 Devmapper::destroy(idHash); 809 } 810 Loop::destroyByDevice(loopDevice); 811 return -1; 812 } 813 814 mActiveContainers->push_back(new ContainerData(strdup(img), OBB)); 815 if (mDebug) { 816 SLOGD("Image %s mounted", img); 817 } 818 return 0; 819} 820 821int VolumeManager::mountVolume(const char *label) { 822 Volume *v = lookupVolume(label); 823 824 if (!v) { 825 errno = ENOENT; 826 return -1; 827 } 828 829 return v->mountVol(); 830} 831 832int VolumeManager::listMountedObbs(SocketClient* cli) { 833 char device[256]; 834 char mount_path[256]; 835 char rest[256]; 836 FILE *fp; 837 char line[1024]; 838 839 if (!(fp = fopen("/proc/mounts", "r"))) { 840 SLOGE("Error opening /proc/mounts (%s)", strerror(errno)); 841 return -1; 842 } 843 844 // Create a string to compare against that has a trailing slash 845 int loopDirLen = sizeof(Volume::LOOPDIR); 846 char loopDir[loopDirLen + 2]; 847 strcpy(loopDir, Volume::LOOPDIR); 848 loopDir[loopDirLen++] = '/'; 849 loopDir[loopDirLen] = '\0'; 850 851 while(fgets(line, sizeof(line), fp)) { 852 line[strlen(line)-1] = '\0'; 853 854 /* 855 * Should look like: 856 * /dev/block/loop0 /mnt/obb/fc99df1323fd36424f864dcb76b76d65 ... 857 */ 858 sscanf(line, "%255s %255s %255s\n", device, mount_path, rest); 859 860 if (!strncmp(mount_path, loopDir, loopDirLen)) { 861 int fd = open(device, O_RDONLY); 862 if (fd >= 0) { 863 struct loop_info64 li; 864 if (ioctl(fd, LOOP_GET_STATUS64, &li) >= 0) { 865 cli->sendMsg(ResponseCode::AsecListResult, 866 (const char*) li.lo_file_name, false); 867 } 868 close(fd); 869 } 870 } 871 } 872 873 fclose(fp); 874 return 0; 875} 876 877int VolumeManager::shareEnabled(const char *label, const char *method, bool *enabled) { 878 Volume *v = lookupVolume(label); 879 880 if (!v) { 881 errno = ENOENT; 882 return -1; 883 } 884 885 if (strcmp(method, "ums")) { 886 errno = ENOSYS; 887 return -1; 888 } 889 890 if (v->getState() != Volume::State_Shared) { 891 *enabled = false; 892 } else { 893 *enabled = true; 894 } 895 return 0; 896} 897 898int VolumeManager::shareVolume(const char *label, const char *method) { 899 Volume *v = lookupVolume(label); 900 901 if (!v) { 902 errno = ENOENT; 903 return -1; 904 } 905 906 /* 907 * Eventually, we'll want to support additional share back-ends, 908 * some of which may work while the media is mounted. For now, 909 * we just support UMS 910 */ 911 if (strcmp(method, "ums")) { 912 errno = ENOSYS; 913 return -1; 914 } 915 916 if (v->getState() == Volume::State_NoMedia) { 917 errno = ENODEV; 918 return -1; 919 } 920 921 if (v->getState() != Volume::State_Idle) { 922 // You need to unmount manually befoe sharing 923 errno = EBUSY; 924 return -1; 925 } 926 927 dev_t d = v->getShareDevice(); 928 if ((MAJOR(d) == 0) && (MINOR(d) == 0)) { 929 // This volume does not support raw disk access 930 errno = EINVAL; 931 return -1; 932 } 933 934 int fd; 935 char nodepath[255]; 936 snprintf(nodepath, 937 sizeof(nodepath), "/dev/block/vold/%d:%d", 938 MAJOR(d), MINOR(d)); 939 940 if ((fd = open("/sys/devices/platform/usb_mass_storage/lun0/file", 941 O_WRONLY)) < 0) { 942 SLOGE("Unable to open ums lunfile (%s)", strerror(errno)); 943 return -1; 944 } 945 946 if (write(fd, nodepath, strlen(nodepath)) < 0) { 947 SLOGE("Unable to write to ums lunfile (%s)", strerror(errno)); 948 close(fd); 949 return -1; 950 } 951 952 close(fd); 953 v->handleVolumeShared(); 954 if (mUmsSharingCount++ == 0) { 955 FILE* fp; 956 mSavedDirtyRatio = -1; // in case we fail 957 if ((fp = fopen("/proc/sys/vm/dirty_ratio", "r+"))) { 958 char line[16]; 959 if (fgets(line, sizeof(line), fp) && sscanf(line, "%d", &mSavedDirtyRatio)) { 960 fprintf(fp, "%d\n", mUmsDirtyRatio); 961 } else { 962 SLOGE("Failed to read dirty_ratio (%s)", strerror(errno)); 963 } 964 fclose(fp); 965 } else { 966 SLOGE("Failed to open /proc/sys/vm/dirty_ratio (%s)", strerror(errno)); 967 } 968 } 969 return 0; 970} 971 972int VolumeManager::unshareVolume(const char *label, const char *method) { 973 Volume *v = lookupVolume(label); 974 975 if (!v) { 976 errno = ENOENT; 977 return -1; 978 } 979 980 if (strcmp(method, "ums")) { 981 errno = ENOSYS; 982 return -1; 983 } 984 985 if (v->getState() != Volume::State_Shared) { 986 errno = EINVAL; 987 return -1; 988 } 989 990 int fd; 991 if ((fd = open("/sys/devices/platform/usb_mass_storage/lun0/file", O_WRONLY)) < 0) { 992 SLOGE("Unable to open ums lunfile (%s)", strerror(errno)); 993 return -1; 994 } 995 996 char ch = 0; 997 if (write(fd, &ch, 1) < 0) { 998 SLOGE("Unable to write to ums lunfile (%s)", strerror(errno)); 999 close(fd); 1000 return -1; 1001 } 1002 1003 close(fd); 1004 v->handleVolumeUnshared(); 1005 if (--mUmsSharingCount == 0 && mSavedDirtyRatio != -1) { 1006 FILE* fp; 1007 if ((fp = fopen("/proc/sys/vm/dirty_ratio", "r+"))) { 1008 fprintf(fp, "%d\n", mSavedDirtyRatio); 1009 fclose(fp); 1010 } else { 1011 SLOGE("Failed to open /proc/sys/vm/dirty_ratio (%s)", strerror(errno)); 1012 } 1013 mSavedDirtyRatio = -1; 1014 } 1015 return 0; 1016} 1017 1018extern "C" int vold_unmountVol(const char *label) { 1019 VolumeManager *vm = VolumeManager::Instance(); 1020 return vm->unmountVolume(label, true); 1021} 1022 1023extern "C" int vold_getNumDirectVolumes(void) { 1024 VolumeManager *vm = VolumeManager::Instance(); 1025 return vm->getNumDirectVolumes(); 1026} 1027 1028int VolumeManager::getNumDirectVolumes(void) { 1029 VolumeCollection::iterator i; 1030 int n=0; 1031 1032 for (i = mVolumes->begin(); i != mVolumes->end(); ++i) { 1033 if ((*i)->getShareDevice() != (dev_t)0) { 1034 n++; 1035 } 1036 } 1037 return n; 1038} 1039 1040extern "C" int vold_getDirectVolumeList(struct volume_info *vol_list) { 1041 VolumeManager *vm = VolumeManager::Instance(); 1042 return vm->getDirectVolumeList(vol_list); 1043} 1044 1045int VolumeManager::getDirectVolumeList(struct volume_info *vol_list) { 1046 VolumeCollection::iterator i; 1047 int n=0; 1048 dev_t d; 1049 1050 for (i = mVolumes->begin(); i != mVolumes->end(); ++i) { 1051 if ((d=(*i)->getShareDevice()) != (dev_t)0) { 1052 (*i)->getVolInfo(&vol_list[n]); 1053 snprintf(vol_list[n].blk_dev, sizeof(vol_list[n].blk_dev), 1054 "/dev/block/vold/%d:%d",MAJOR(d), MINOR(d)); 1055 n++; 1056 } 1057 } 1058 1059 return 0; 1060} 1061 1062int VolumeManager::unmountVolume(const char *label, bool force) { 1063 Volume *v = lookupVolume(label); 1064 1065 if (!v) { 1066 errno = ENOENT; 1067 return -1; 1068 } 1069 1070 if (v->getState() == Volume::State_NoMedia) { 1071 errno = ENODEV; 1072 return -1; 1073 } 1074 1075 if (v->getState() != Volume::State_Mounted) { 1076 SLOGW("Attempt to unmount volume which isn't mounted (%d)\n", 1077 v->getState()); 1078 errno = EBUSY; 1079 return -1; 1080 } 1081 1082 cleanupAsec(v, force); 1083 1084 return v->unmountVol(force); 1085} 1086 1087/* 1088 * Looks up a volume by it's label or mount-point 1089 */ 1090Volume *VolumeManager::lookupVolume(const char *label) { 1091 VolumeCollection::iterator i; 1092 1093 for (i = mVolumes->begin(); i != mVolumes->end(); ++i) { 1094 if (label[0] == '/') { 1095 if (!strcmp(label, (*i)->getMountpoint())) 1096 return (*i); 1097 } else { 1098 if (!strcmp(label, (*i)->getLabel())) 1099 return (*i); 1100 } 1101 } 1102 return NULL; 1103} 1104 1105bool VolumeManager::isMountpointMounted(const char *mp) 1106{ 1107 char device[256]; 1108 char mount_path[256]; 1109 char rest[256]; 1110 FILE *fp; 1111 char line[1024]; 1112 1113 if (!(fp = fopen("/proc/mounts", "r"))) { 1114 SLOGE("Error opening /proc/mounts (%s)", strerror(errno)); 1115 return false; 1116 } 1117 1118 while(fgets(line, sizeof(line), fp)) { 1119 line[strlen(line)-1] = '\0'; 1120 sscanf(line, "%255s %255s %255s\n", device, mount_path, rest); 1121 if (!strcmp(mount_path, mp)) { 1122 fclose(fp); 1123 return true; 1124 } 1125 } 1126 1127 fclose(fp); 1128 return false; 1129} 1130 1131int VolumeManager::cleanupAsec(Volume *v, bool force) { 1132 while(mActiveContainers->size()) { 1133 AsecIdCollection::iterator it = mActiveContainers->begin(); 1134 ContainerData* cd = *it; 1135 SLOGI("Unmounting ASEC %s (dependant on %s)", cd->id, v->getMountpoint()); 1136 if (cd->type == ASEC) { 1137 if (unmountAsec(cd->id, force)) { 1138 SLOGE("Failed to unmount ASEC %s (%s)", cd->id, strerror(errno)); 1139 return -1; 1140 } 1141 } else if (cd->type == OBB) { 1142 if (unmountObb(cd->id, force)) { 1143 SLOGE("Failed to unmount OBB %s (%s)", cd->id, strerror(errno)); 1144 return -1; 1145 } 1146 } else { 1147 SLOGE("Unknown container type %d!", cd->type); 1148 return -1; 1149 } 1150 } 1151 return 0; 1152} 1153 1154