VolumeManager.cpp revision 0e382532f32e97f90056250f2b13c59840d2c6b4
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 <cutils/log.h> 31 32#include <sysutils/NetlinkEvent.h> 33 34#include "VolumeManager.h" 35#include "DirectVolume.h" 36#include "ResponseCode.h" 37#include "Loop.h" 38#include "Fat.h" 39#include "Devmapper.h" 40#include "Process.h" 41 42VolumeManager *VolumeManager::sInstance = NULL; 43 44VolumeManager *VolumeManager::Instance() { 45 if (!sInstance) 46 sInstance = new VolumeManager(); 47 return sInstance; 48} 49 50VolumeManager::VolumeManager() { 51 mBlockDevices = new BlockDeviceCollection(); 52 mVolumes = new VolumeCollection(); 53 mActiveContainers = new AsecIdCollection(); 54 mBroadcaster = NULL; 55 mUsbMassStorageConnected = false; 56} 57 58VolumeManager::~VolumeManager() { 59 delete mBlockDevices; 60 delete mVolumes; 61 delete mActiveContainers; 62} 63 64int VolumeManager::start() { 65 return 0; 66} 67 68int VolumeManager::stop() { 69 return 0; 70} 71 72int VolumeManager::addVolume(Volume *v) { 73 mVolumes->push_back(v); 74 return 0; 75} 76 77void VolumeManager::notifyUmsConnected(bool connected) { 78 char msg[255]; 79 80 if (connected) { 81 mUsbMassStorageConnected = true; 82 } else { 83 mUsbMassStorageConnected = false; 84 } 85 snprintf(msg, sizeof(msg), "Share method ums now %s", 86 (connected ? "available" : "unavailable")); 87 88 getBroadcaster()->sendBroadcast(ResponseCode::ShareAvailabilityChange, 89 msg, false); 90} 91 92void VolumeManager::handleSwitchEvent(NetlinkEvent *evt) { 93 const char *devpath = evt->findParam("DEVPATH"); 94 const char *name = evt->findParam("SWITCH_NAME"); 95 const char *state = evt->findParam("SWITCH_STATE"); 96 97 if (!name || !state) { 98 LOGW("Switch %s event missing name/state info", devpath); 99 return; 100 } 101 102 if (!strcmp(name, "usb_mass_storage")) { 103 104 if (!strcmp(state, "online")) { 105 notifyUmsConnected(true); 106 } else { 107 notifyUmsConnected(false); 108 } 109 } else { 110 LOGW("Ignoring unknown switch '%s'", name); 111 } 112} 113 114void VolumeManager::handleBlockEvent(NetlinkEvent *evt) { 115 const char *devpath = evt->findParam("DEVPATH"); 116 117 /* Lookup a volume to handle this device */ 118 VolumeCollection::iterator it; 119 bool hit = false; 120 for (it = mVolumes->begin(); it != mVolumes->end(); ++it) { 121 if (!(*it)->handleBlockEvent(evt)) { 122#ifdef NETLINK_DEBUG 123 LOGD("Device '%s' event handled by volume %s\n", devpath, (*it)->getLabel()); 124#endif 125 hit = true; 126 break; 127 } 128 } 129 130 if (!hit) { 131#ifdef NETLINK_DEBUG 132 LOGW("No volumes handled block event for '%s'", devpath); 133#endif 134 } 135} 136 137int VolumeManager::listVolumes(SocketClient *cli) { 138 VolumeCollection::iterator i; 139 140 for (i = mVolumes->begin(); i != mVolumes->end(); ++i) { 141 char *buffer; 142 asprintf(&buffer, "%s %s %d", 143 (*i)->getLabel(), (*i)->getMountpoint(), 144 (*i)->getState()); 145 cli->sendMsg(ResponseCode::VolumeListResult, buffer, false); 146 free(buffer); 147 } 148 cli->sendMsg(ResponseCode::CommandOkay, "Volumes listed.", false); 149 return 0; 150} 151 152int VolumeManager::formatVolume(const char *label) { 153 Volume *v = lookupVolume(label); 154 155 if (!v) { 156 errno = ENOENT; 157 return -1; 158 } 159 160 return v->formatVol(); 161} 162 163int VolumeManager::getAsecMountPath(const char *id, char *buffer, int maxlen) { 164 165 snprintf(buffer, maxlen, "%s/%s", Volume::ASECDIR, id); 166 return 0; 167} 168 169int VolumeManager::createAsec(const char *id, unsigned int numSectors, 170 const char *fstype, const char *key, int ownerUid) { 171 172 if (numSectors < ((1024*1024)/512)) { 173 LOGE("Invalid container size specified (%d sectors)", numSectors); 174 errno = EINVAL; 175 return -1; 176 } 177 178 if (lookupVolume(id)) { 179 LOGE("ASEC id '%s' currently exists", id); 180 errno = EADDRINUSE; 181 return -1; 182 } 183 184 char asecFileName[255]; 185 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 186 187 if (!access(asecFileName, F_OK)) { 188 LOGE("ASEC file '%s' currently exists - destroy it first! (%s)", 189 asecFileName, strerror(errno)); 190 errno = EADDRINUSE; 191 return -1; 192 } 193 194 if (Loop::createImageFile(asecFileName, numSectors)) { 195 LOGE("ASEC image file creation failed (%s)", strerror(errno)); 196 return -1; 197 } 198 199 char loopDevice[255]; 200 if (Loop::create(asecFileName, loopDevice, sizeof(loopDevice))) { 201 LOGE("ASEC loop device creation failed (%s)", strerror(errno)); 202 unlink(asecFileName); 203 return -1; 204 } 205 206 char dmDevice[255]; 207 bool cleanupDm = false; 208 209 if (strcmp(key, "none")) { 210 if (Devmapper::create(id, loopDevice, key, numSectors, dmDevice, 211 sizeof(dmDevice))) { 212 LOGE("ASEC device mapping failed (%s)", strerror(errno)); 213 Loop::destroyByDevice(loopDevice); 214 unlink(asecFileName); 215 return -1; 216 } 217 cleanupDm = true; 218 } else { 219 strcpy(dmDevice, loopDevice); 220 } 221 222 if (Fat::format(dmDevice)) { 223 LOGE("ASEC FAT format failed (%s)", strerror(errno)); 224 if (cleanupDm) { 225 Devmapper::destroy(id); 226 } 227 Loop::destroyByDevice(loopDevice); 228 unlink(asecFileName); 229 return -1; 230 } 231 232 char mountPoint[255]; 233 234 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); 235 if (mkdir(mountPoint, 0777)) { 236 if (errno != EEXIST) { 237 LOGE("Mountpoint creation failed (%s)", strerror(errno)); 238 if (cleanupDm) { 239 Devmapper::destroy(id); 240 } 241 Loop::destroyByDevice(loopDevice); 242 unlink(asecFileName); 243 return -1; 244 } 245 } 246 247 if (Fat::doMount(dmDevice, mountPoint, false, false, ownerUid, 248 0, 0000, false)) { 249// 0, 0007, false)) { 250 LOGE("ASEC FAT mount failed (%s)", strerror(errno)); 251 if (cleanupDm) { 252 Devmapper::destroy(id); 253 } 254 Loop::destroyByDevice(loopDevice); 255 unlink(asecFileName); 256 return -1; 257 } 258 259 mActiveContainers->push_back(strdup(id)); 260 return 0; 261} 262 263int VolumeManager::finalizeAsec(const char *id) { 264 char asecFileName[255]; 265 char loopDevice[255]; 266 char mountPoint[255]; 267 268 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 269 270 if (Loop::lookupActive(asecFileName, loopDevice, sizeof(loopDevice))) { 271 LOGE("Unable to finalize %s (%s)", id, strerror(errno)); 272 return -1; 273 } 274 275 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); 276 // XXX: 277 if (Fat::doMount(loopDevice, mountPoint, true, true, 0, 0, 0227, false)) { 278 LOGE("ASEC finalize mount failed (%s)", strerror(errno)); 279 return -1; 280 } 281 282 LOGD("ASEC %s finalized", id); 283 return 0; 284} 285 286int VolumeManager::renameAsec(const char *id1, const char *id2) { 287 char *asecFilename1; 288 char *asecFilename2; 289 char mountPoint[255]; 290 291 asprintf(&asecFilename1, "%s/%s.asec", Volume::SEC_ASECDIR, id1); 292 asprintf(&asecFilename2, "%s/%s.asec", Volume::SEC_ASECDIR, id2); 293 294 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id1); 295 if (isMountpointMounted(mountPoint)) { 296 LOGW("Rename attempt when src mounted"); 297 errno = EBUSY; 298 goto out_err; 299 } 300 301 if (!access(asecFilename2, F_OK)) { 302 LOGE("Rename attempt when dst exists"); 303 errno = EADDRINUSE; 304 goto out_err; 305 } 306 307 if (rename(asecFilename1, asecFilename2)) { 308 LOGE("Rename of '%s' to '%s' failed (%s)", asecFilename1, asecFilename2, strerror(errno)); 309 goto out_err; 310 } 311 312 free(asecFilename1); 313 free(asecFilename2); 314 return 0; 315 316out_err: 317 free(asecFilename1); 318 free(asecFilename2); 319 return -1; 320} 321 322#define ASEC_UNMOUNT_RETRIES 5 323int VolumeManager::unmountAsec(const char *id, bool force) { 324 char asecFileName[255]; 325 char mountPoint[255]; 326 327 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 328 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); 329 330 if (!isMountpointMounted(mountPoint)) { 331 LOGE("Unmount request for ASEC %s when not mounted", id); 332 errno = EINVAL; 333 return -1; 334 } 335 336 int i, rc; 337 for (i = 1; i <= ASEC_UNMOUNT_RETRIES; i++) { 338 rc = umount(mountPoint); 339 if (!rc) { 340 break; 341 } 342 if (rc && (errno == EINVAL || errno == ENOENT)) { 343 rc = 0; 344 break; 345 } 346 LOGW("ASEC %s unmount attempt %d failed (%s)", 347 id, i, strerror(errno)); 348 349 int action = 0; // default is to just complain 350 351 if (force) { 352 if (i > (ASEC_UNMOUNT_RETRIES - 2)) 353 action = 2; // SIGKILL 354 else if (i > (ASEC_UNMOUNT_RETRIES - 3)) 355 action = 1; // SIGHUP 356 } 357 358 Process::killProcessesWithOpenFiles(mountPoint, action); 359 usleep(1000 * 1000); 360 } 361 362 if (rc) { 363 errno = EBUSY; 364 LOGE("Failed to unmount container %s (%s)", id, strerror(errno)); 365 return -1; 366 } 367 368 if (rmdir(mountPoint)) { 369 LOGE("Failed to rmdir mountpoint (%s)", strerror(errno)); 370 } 371 372 if (Devmapper::destroy(id) && errno != ENXIO) { 373 LOGE("Failed to destroy devmapper instance (%s)", strerror(errno)); 374 } 375 376 char loopDevice[255]; 377 if (!Loop::lookupActive(asecFileName, loopDevice, sizeof(loopDevice))) { 378 Loop::destroyByDevice(loopDevice); 379 } 380 381 AsecIdCollection::iterator it; 382 for (it = mActiveContainers->begin(); it != mActiveContainers->end(); ++it) { 383 if (!strcmp(*it, id)) { 384 free(*it); 385 mActiveContainers->erase(it); 386 break; 387 } 388 } 389 if (it == mActiveContainers->end()) { 390 LOGW("mActiveContainers is inconsistent!"); 391 } 392 return 0; 393} 394 395int VolumeManager::destroyAsec(const char *id, bool force) { 396 char asecFileName[255]; 397 char mountPoint[255]; 398 399 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 400 401 if (isMountpointMounted(mountPoint)) { 402 LOGD("Unmounting container before destroy"); 403 if (unmountAsec(id, force)) { 404 LOGE("Failed to unmount asec %s for destroy (%s)", id, strerror(errno)); 405 return -1; 406 } 407 } 408 409 if (unlink(asecFileName)) { 410 LOGE("Failed to unlink asec '%s' (%s)", asecFileName, strerror(errno)); 411 return -1; 412 } 413 414 LOGD("ASEC %s destroyed", id); 415 return 0; 416} 417 418int VolumeManager::mountAsec(const char *id, const char *key, int ownerUid) { 419 char asecFileName[255]; 420 char mountPoint[255]; 421 422 snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id); 423 snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id); 424 425 if (isMountpointMounted(mountPoint)) { 426 LOGE("ASEC %s already mounted", id); 427 errno = EBUSY; 428 return -1; 429 } 430 431 char loopDevice[255]; 432 if (Loop::lookupActive(asecFileName, loopDevice, sizeof(loopDevice))) { 433 if (Loop::create(asecFileName, loopDevice, sizeof(loopDevice))) { 434 LOGE("ASEC loop device creation failed (%s)", strerror(errno)); 435 return -1; 436 } 437 LOGD("New loop device created at %s", loopDevice); 438 } else { 439 LOGD("Found active loopback for %s at %s", asecFileName, loopDevice); 440 } 441 442 char dmDevice[255]; 443 bool cleanupDm = false; 444 if (strcmp(key, "none")) { 445 if (Devmapper::lookupActive(id, dmDevice, sizeof(dmDevice))) { 446 unsigned int nr_sec = 0; 447 int fd; 448 449 if ((fd = open(loopDevice, O_RDWR)) < 0) { 450 LOGE("Failed to open loopdevice (%s)", strerror(errno)); 451 Loop::destroyByDevice(loopDevice); 452 return -1; 453 } 454 455 if (ioctl(fd, BLKGETSIZE, &nr_sec)) { 456 LOGE("Failed to get loop size (%s)", strerror(errno)); 457 Loop::destroyByDevice(loopDevice); 458 close(fd); 459 return -1; 460 } 461 close(fd); 462 if (Devmapper::create(id, loopDevice, key, nr_sec, 463 dmDevice, sizeof(dmDevice))) { 464 LOGE("ASEC device mapping failed (%s)", strerror(errno)); 465 Loop::destroyByDevice(loopDevice); 466 return -1; 467 } 468 LOGD("New devmapper instance created at %s", dmDevice); 469 } else { 470 LOGD("Found active devmapper for %s at %s", asecFileName, dmDevice); 471 } 472 cleanupDm = true; 473 } else { 474 strcpy(dmDevice, loopDevice); 475 } 476 477 if (mkdir(mountPoint, 0777)) { 478 if (errno != EEXIST) { 479 LOGE("Mountpoint creation failed (%s)", strerror(errno)); 480 if (cleanupDm) { 481 Devmapper::destroy(id); 482 } 483 Loop::destroyByDevice(loopDevice); 484 return -1; 485 } 486 } 487 488 if (Fat::doMount(dmDevice, mountPoint, true, false, ownerUid, 0, 489 0222, false)) { 490// 0227, false)) { 491 LOGE("ASEC mount failed (%s)", strerror(errno)); 492 if (cleanupDm) { 493 Devmapper::destroy(id); 494 } 495 Loop::destroyByDevice(loopDevice); 496 return -1; 497 } 498 499 mActiveContainers->push_back(strdup(id)); 500 LOGD("ASEC %s mounted", id); 501 return 0; 502} 503 504int VolumeManager::mountVolume(const char *label) { 505 Volume *v = lookupVolume(label); 506 507 if (!v) { 508 errno = ENOENT; 509 return -1; 510 } 511 512 return v->mountVol(); 513} 514 515int VolumeManager::shareAvailable(const char *method, bool *avail) { 516 517 if (strcmp(method, "ums")) { 518 errno = ENOSYS; 519 return -1; 520 } 521 522 if (mUsbMassStorageConnected) 523 *avail = true; 524 else 525 *avail = false; 526 return 0; 527} 528 529int VolumeManager::shareEnabled(const char *label, const char *method, bool *enabled) { 530 Volume *v = lookupVolume(label); 531 532 if (!v) { 533 errno = ENOENT; 534 return -1; 535 } 536 537 if (strcmp(method, "ums")) { 538 errno = ENOSYS; 539 return -1; 540 } 541 542 if (v->getState() != Volume::State_Shared) { 543 *enabled = false; 544 } else { 545 *enabled = true; 546 } 547 return 0; 548} 549 550int VolumeManager::simulate(const char *cmd, const char *arg) { 551 552 if (!strcmp(cmd, "ums")) { 553 if (!strcmp(arg, "connect")) { 554 notifyUmsConnected(true); 555 } else if (!strcmp(arg, "disconnect")) { 556 notifyUmsConnected(false); 557 } else { 558 errno = EINVAL; 559 return -1; 560 } 561 } else { 562 errno = EINVAL; 563 return -1; 564 } 565 return 0; 566} 567 568int VolumeManager::shareVolume(const char *label, const char *method) { 569 Volume *v = lookupVolume(label); 570 571 if (!v) { 572 errno = ENOENT; 573 return -1; 574 } 575 576 /* 577 * Eventually, we'll want to support additional share back-ends, 578 * some of which may work while the media is mounted. For now, 579 * we just support UMS 580 */ 581 if (strcmp(method, "ums")) { 582 errno = ENOSYS; 583 return -1; 584 } 585 586 if (v->getState() == Volume::State_NoMedia) { 587 errno = ENODEV; 588 return -1; 589 } 590 591 if (v->getState() != Volume::State_Idle) { 592 // You need to unmount manually befoe sharing 593 errno = EBUSY; 594 return -1; 595 } 596 597 dev_t d = v->getDiskDevice(); 598 if ((MAJOR(d) == 0) && (MINOR(d) == 0)) { 599 // This volume does not support raw disk access 600 errno = EINVAL; 601 return -1; 602 } 603 604 int fd; 605 char nodepath[255]; 606 snprintf(nodepath, 607 sizeof(nodepath), "/dev/block/vold/%d:%d", 608 MAJOR(d), MINOR(d)); 609 610 if ((fd = open("/sys/devices/platform/usb_mass_storage/lun0/file", 611 O_WRONLY)) < 0) { 612 LOGE("Unable to open ums lunfile (%s)", strerror(errno)); 613 return -1; 614 } 615 616 if (write(fd, nodepath, strlen(nodepath)) < 0) { 617 LOGE("Unable to write to ums lunfile (%s)", strerror(errno)); 618 close(fd); 619 return -1; 620 } 621 622 close(fd); 623 v->handleVolumeShared(); 624 return 0; 625} 626 627int VolumeManager::unshareVolume(const char *label, const char *method) { 628 Volume *v = lookupVolume(label); 629 630 if (!v) { 631 errno = ENOENT; 632 return -1; 633 } 634 635 if (strcmp(method, "ums")) { 636 errno = ENOSYS; 637 return -1; 638 } 639 640 if (v->getState() != Volume::State_Shared) { 641 errno = EINVAL; 642 return -1; 643 } 644 645 dev_t d = v->getDiskDevice(); 646 647 int fd; 648 char nodepath[255]; 649 snprintf(nodepath, 650 sizeof(nodepath), "/dev/block/vold/%d:%d", 651 MAJOR(d), MINOR(d)); 652 653 if ((fd = open("/sys/devices/platform/usb_mass_storage/lun0/file", O_WRONLY)) < 0) { 654 LOGE("Unable to open ums lunfile (%s)", strerror(errno)); 655 return -1; 656 } 657 658 char ch = 0; 659 if (write(fd, &ch, 1) < 0) { 660 LOGE("Unable to write to ums lunfile (%s)", strerror(errno)); 661 close(fd); 662 return -1; 663 } 664 665 close(fd); 666 v->handleVolumeUnshared(); 667 return 0; 668} 669 670int VolumeManager::unmountVolume(const char *label, bool force) { 671 Volume *v = lookupVolume(label); 672 673 if (!v) { 674 errno = ENOENT; 675 return -1; 676 } 677 678 if (v->getState() == Volume::State_NoMedia) { 679 errno = ENODEV; 680 return -1; 681 } 682 683 if (v->getState() != Volume::State_Mounted) { 684 LOGW("Attempt to unmount volume which isn't mounted (%d)\n", 685 v->getState()); 686 errno = EBUSY; 687 return -1; 688 } 689 690 while(mActiveContainers->size()) { 691 AsecIdCollection::iterator it = mActiveContainers->begin(); 692 LOGI("Unmounting ASEC %s (dependant on %s)", *it, v->getMountpoint()); 693 if (unmountAsec(*it, force)) { 694 LOGE("Failed to unmount ASEC %s (%s)", *it, strerror(errno), v->getMountpoint()); 695 return -1; 696 } 697 } 698 699 return v->unmountVol(force); 700} 701 702/* 703 * Looks up a volume by it's label or mount-point 704 */ 705Volume *VolumeManager::lookupVolume(const char *label) { 706 VolumeCollection::iterator i; 707 708 for (i = mVolumes->begin(); i != mVolumes->end(); ++i) { 709 if (label[0] == '/') { 710 if (!strcmp(label, (*i)->getMountpoint())) 711 return (*i); 712 } else { 713 if (!strcmp(label, (*i)->getLabel())) 714 return (*i); 715 } 716 } 717 return NULL; 718} 719 720bool VolumeManager::isMountpointMounted(const char *mp) 721{ 722 char device[256]; 723 char mount_path[256]; 724 char rest[256]; 725 FILE *fp; 726 char line[1024]; 727 728 if (!(fp = fopen("/proc/mounts", "r"))) { 729 LOGE("Error opening /proc/mounts (%s)", strerror(errno)); 730 return false; 731 } 732 733 while(fgets(line, sizeof(line), fp)) { 734 line[strlen(line)-1] = '\0'; 735 sscanf(line, "%255s %255s %255s\n", device, mount_path, rest); 736 if (!strcmp(mount_path, mp)) { 737 fclose(fp); 738 return true; 739 } 740 741 } 742 743 fclose(fp); 744 return false; 745} 746 747