VolumeManager.cpp - SHIFTPHONES/android_system_vold - Gitiles

 /*
  * Copyright (C) 2008 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/mount.h>

 #include <linux/kdev_t.h>

 #define LOG_TAG "Vold"

 #include <cutils/log.h>

 #include <sysutils/NetlinkEvent.h>

 #include "VolumeManager.h"
 #include "DirectVolume.h"
 #include "ResponseCode.h"
 #include "Loop.h"
 #include "Fat.h"
 #include "Devmapper.h"

 extern "C" void KillProcessesWithOpenFiles(const char *, int, int, int);

 VolumeManager *VolumeManager::sInstance = NULL;

 VolumeManager *VolumeManager::Instance() {
     if (!sInstance)
         sInstance = new VolumeManager();
     return sInstance;
 }

 VolumeManager::VolumeManager() {
     mBlockDevices = new BlockDeviceCollection();
     mVolumes = new VolumeCollection();
     mActiveContainers = new AsecIdCollection();
     mBroadcaster = NULL;
     mUsbMassStorageConnected = false;
 }

 VolumeManager::~VolumeManager() {
     delete mBlockDevices;
     delete mVolumes;
     delete mActiveContainers;
 }

 int VolumeManager::start() {
     return 0;
 }

 int VolumeManager::stop() {
     return 0;
 }

 int VolumeManager::addVolume(Volume *v) {
     mVolumes->push_back(v);
     return 0;
 }

 void VolumeManager::notifyUmsConnected(bool connected) {
     char msg[255];

     if (connected) {
         mUsbMassStorageConnected = true;
     } else {
         mUsbMassStorageConnected = false;
     }
     snprintf(msg, sizeof(msg), "Share method ums now %s",
              (connected ? "available" : "unavailable"));

     getBroadcaster()->sendBroadcast(ResponseCode::ShareAvailabilityChange,
                                     msg, false);
 }

 void VolumeManager::handleSwitchEvent(NetlinkEvent *evt) {
     const char *devpath = evt->findParam("DEVPATH");
     const char *name = evt->findParam("SWITCH_NAME");
     const char *state = evt->findParam("SWITCH_STATE");

     if (!name || !state) {
         LOGW("Switch %s event missing name/state info", devpath);
         return;
     }

     if (!strcmp(name, "usb_mass_storage")) {

         if (!strcmp(state, "online"))  {
             notifyUmsConnected(true);
         } else {
             notifyUmsConnected(false);
         }
     } else {
         LOGW("Ignoring unknown switch '%s'", name);
     }
 }

 void VolumeManager::handleBlockEvent(NetlinkEvent *evt) {
     const char *devpath = evt->findParam("DEVPATH");

     /* Lookup a volume to handle this device */
     VolumeCollection::iterator it;
     bool hit = false;
     for (it = mVolumes->begin(); it != mVolumes->end(); ++it) {
         if (!(*it)->handleBlockEvent(evt)) {
 #ifdef NETLINK_DEBUG
             LOGD("Device '%s' event handled by volume %s\n", devpath, (*it)->getLabel());
 #endif
             hit = true;
             break;
         }
     }

     if (!hit) {
 #ifdef NETLINK_DEBUG
         LOGW("No volumes handled block event for '%s'", devpath);
 #endif
     }
 }

 int VolumeManager::listVolumes(SocketClient *cli) {
     VolumeCollection::iterator i;

     for (i = mVolumes->begin(); i != mVolumes->end(); ++i) {
         char *buffer;
         asprintf(&buffer, "%s %s %d",
                  (*i)->getLabel(), (*i)->getMountpoint(),
                  (*i)->getState());
         cli->sendMsg(ResponseCode::VolumeListResult, buffer, false);
         free(buffer);
     }
     cli->sendMsg(ResponseCode::CommandOkay, "Volumes listed.", false);
     return 0;
 }

 int VolumeManager::formatVolume(const char *label) {
     Volume *v = lookupVolume(label);

     if (!v) {
         errno = ENOENT;
         return -1;
     }

     return v->formatVol();
 }

 int VolumeManager::getAsecMountPath(const char *id, char *buffer, int maxlen) {
     char mountPoint[255];

     snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);

     if (!isMountpointMounted(mountPoint)) {
         errno = ENOENT;
         return -1;
     }
     snprintf(buffer, maxlen, "/asec/%s", id);
     return 0;
 }

 int VolumeManager::createAsec(const char *id, unsigned int numSectors,
                               const char *fstype, const char *key, int ownerUid) {

     mkdir("/sdcard/android_secure", 0777);

     if (lookupVolume(id)) {
         LOGE("ASEC volume '%s' currently exists", id);
         errno = EADDRINUSE;
         return -1;
     }

     char asecFileName[255];
     snprintf(asecFileName, sizeof(asecFileName),
              "/sdcard/android_secure/%s.asec", id);

     if (!access(asecFileName, F_OK)) {
         LOGE("ASEC file '%s' currently exists - destroy it first! (%s)",
              asecFileName, strerror(errno));
         errno = EADDRINUSE;
         return -1;
     }

     if (Loop::createImageFile(asecFileName, numSectors)) {
         LOGE("ASEC image file creation failed (%s)", strerror(errno));
         return -1;
     }

     char loopDevice[255];
     if (Loop::create(asecFileName, loopDevice, sizeof(loopDevice))) {
         LOGE("ASEC loop device creation failed (%s)", strerror(errno));
         unlink(asecFileName);
         return -1;
     }

     char dmDevice[255];
     bool cleanupDm = false;

     if (strcmp(key, "none")) {
         if (Devmapper::create(id, loopDevice, key, numSectors, dmDevice,
                              sizeof(dmDevice))) {
             LOGE("ASEC device mapping failed (%s)", strerror(errno));
             Loop::destroyByDevice(loopDevice);
             unlink(asecFileName);
             return -1;
         }
         cleanupDm = true;
     } else {
         strcpy(dmDevice, loopDevice);
     }

     if (Fat::format(dmDevice)) {
         LOGE("ASEC FAT format failed (%s)", strerror(errno));
         if (cleanupDm) {
             Devmapper::destroy(id);
         }
         Loop::destroyByDevice(loopDevice);
         unlink(asecFileName);
         return -1;
     }

     char mountPoint[255];

     snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);
     if (mkdir(mountPoint, 0777)) {
         if (errno != EEXIST) {
             LOGE("Mountpoint creation failed (%s)", strerror(errno));
             if (cleanupDm) {
                 Devmapper::destroy(id);
             }
             Loop::destroyByDevice(loopDevice);
             unlink(asecFileName);
             return -1;
         }
     }

     if (Fat::doMount(dmDevice, mountPoint, false, false, ownerUid,
                      0, 0000, false)) {
 //                     0, 0007, false)) {
         LOGE("ASEC FAT mount failed (%s)", strerror(errno));
         if (cleanupDm) {
             Devmapper::destroy(id);
         }
         Loop::destroyByDevice(loopDevice);
         unlink(asecFileName);
         return -1;
     }

     mActiveContainers->push_back(strdup(id));
     return 0;
 }

 int VolumeManager::finalizeAsec(const char *id) {
     char asecFileName[255];
     char loopDevice[255];
     char mountPoint[255];

     snprintf(asecFileName, sizeof(asecFileName),
              "/sdcard/android_secure/%s.asec", id);

     if (Loop::lookupActive(asecFileName, loopDevice, sizeof(loopDevice))) {
         LOGE("Unable to finalize %s (%s)", id, strerror(errno));
         return -1;
     }

     snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);
     // XXX:
     if (Fat::doMount(loopDevice, mountPoint, true, true, 0, 0, 0227, false)) {
         LOGE("ASEC finalize mount failed (%s)", strerror(errno));
         return -1;
     }

     LOGD("ASEC %s finalized", id);
     return 0;
 }

 int VolumeManager::unmountAsec(const char *id) {
     char asecFileName[255];
     char mountPoint[255];

     snprintf(asecFileName, sizeof(asecFileName),
              "/sdcard/android_secure/%s.asec", id);
     snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);

     if (!isMountpointMounted(mountPoint)) {
         LOGE("Unmount request for ASEC %s when not mounted", id);
         errno = EINVAL;
         return -1;
     }

     int i, rc;
     for (i = 0; i < 10; i++) {
         rc = umount(mountPoint);
         if (!rc) {
             break;
         }
         if (rc && (errno == EINVAL || errno == ENOENT)) {
             rc = 0;
             break;
         }
         LOGW("ASEC %s unmount attempt %d failed (%s)",
               id, i +1, strerror(errno));

         if (i >= 5) {
             KillProcessesWithOpenFiles(mountPoint, (i < 7 ? 0 : 1),
                                        NULL, 0);
         }
         usleep(1000 * 250);
     }

     if (rc) {
         LOGE("Failed to unmount ASEC %s", id);
         return -1;
     }

     unlink(mountPoint);

     if (Devmapper::destroy(id) && errno != ENXIO) {
         LOGE("Failed to destroy devmapper instance (%s)", strerror(errno));
     }

     char loopDevice[255];
     if (!Loop::lookupActive(asecFileName, loopDevice, sizeof(loopDevice))) {
         Loop::destroyByDevice(loopDevice);
     }

     AsecIdCollection::iterator it;
     for (it = mActiveContainers->begin(); it != mActiveContainers->end(); ++it) {
         if (!strcmp(*it, id)) {
             free(*it);
             mActiveContainers->erase(it);
             break;
         }
     }
     if (it == mActiveContainers->end()) {
         LOGW("mActiveContainers is inconsistent!");
     }
     return 0;
 }

 int VolumeManager::destroyAsec(const char *id) {
     char asecFileName[255];
     char mountPoint[255];

     snprintf(asecFileName, sizeof(asecFileName),
              "/sdcard/android_secure/%s.asec", id);
     snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);

     if (isMountpointMounted(mountPoint)) {
         if (unmountAsec(id)) {
             LOGE("Failed to unmount asec %s for destroy (%s)", id, strerror(errno));
             return -1;
         }
     }

     if (unlink(asecFileName)) {
         LOGE("Failed to unlink asec %s (%s)", id, strerror(errno));
         return -1;
     }

     LOGD("ASEC %s destroyed", id);
     return 0;
 }

 int VolumeManager::mountAsec(const char *id, const char *key, int ownerUid) {
     char asecFileName[255];
     char mountPoint[255];

     snprintf(asecFileName, sizeof(asecFileName),
              "/sdcard/android_secure/%s.asec", id);
     snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);

     if (isMountpointMounted(mountPoint)) {
         LOGE("ASEC %s already mounted", id);
         errno = EBUSY;
         return -1;
     }

     char loopDevice[255];
     if (Loop::lookupActive(asecFileName, loopDevice, sizeof(loopDevice))) {
         if (Loop::create(asecFileName, loopDevice, sizeof(loopDevice))) {
             LOGE("ASEC loop device creation failed (%s)", strerror(errno));
             return -1;
         }
         LOGD("New loop device created at %s", loopDevice);
     } else {
         LOGD("Found active loopback for %s at %s", asecFileName, loopDevice);
     }

     char dmDevice[255];
     bool cleanupDm = false;
     if (strcmp(key, "none")) {
         if (Devmapper::lookupActive(id, dmDevice, sizeof(dmDevice))) {
             unsigned int nr_sec = 0;
             int fd;

             if ((fd = open(loopDevice, O_RDWR)) < 0) {
                 LOGE("Failed to open loopdevice (%s)", strerror(errno));
                 Loop::destroyByDevice(loopDevice);
                 return -1;
             }

             if (ioctl(fd, BLKGETSIZE, &nr_sec)) {
                 LOGE("Failed to get loop size (%s)", strerror(errno));
                 Loop::destroyByDevice(loopDevice);
                 close(fd);
                 return -1;
             }
             close(fd);
             if (Devmapper::create(id, loopDevice, key, nr_sec,
                                   dmDevice, sizeof(dmDevice))) {
                 LOGE("ASEC device mapping failed (%s)", strerror(errno));
                 Loop::destroyByDevice(loopDevice);
                 return -1;
             }
             LOGD("New devmapper instance created at %s", dmDevice);
         } else {
             LOGD("Found active devmapper for %s at %s", asecFileName, dmDevice);
         }
         cleanupDm = true;
     } else {
         strcpy(dmDevice, loopDevice);
     }

     if (mkdir(mountPoint, 0777)) {
         if (errno != EEXIST) {
             LOGE("Mountpoint creation failed (%s)", strerror(errno));
             if (cleanupDm) {
                 Devmapper::destroy(id);
             }
             Loop::destroyByDevice(loopDevice);
             return -1;
         }
     }

     if (Fat::doMount(dmDevice, mountPoint, true, false, ownerUid, 0,
                      0222, false)) {
 //                     0227, false)) {
         LOGE("ASEC mount failed (%s)", strerror(errno));
         if (cleanupDm) {
             Devmapper::destroy(id);
         }
         Loop::destroyByDevice(loopDevice);
         return -1;
     }

     mActiveContainers->push_back(strdup(id));
     LOGD("ASEC %s mounted", id);
     return 0;
 }

 int VolumeManager::mountVolume(const char *label) {
     Volume *v = lookupVolume(label);

     if (!v) {
         errno = ENOENT;
         return -1;
     }

     return v->mountVol();
 }

 int VolumeManager::shareAvailable(const char *method, bool *avail) {

     if (strcmp(method, "ums")) {
         errno = ENOSYS;
         return -1;
     }

     if (mUsbMassStorageConnected)
         *avail = true;
     else
         *avail = false;
     return 0;
 }

 int VolumeManager::simulate(const char *cmd, const char *arg) {

     if (!strcmp(cmd, "ums")) {
         if (!strcmp(arg, "connect")) {
             notifyUmsConnected(true);
         } else if (!strcmp(arg, "disconnect")) {
             notifyUmsConnected(false);
         } else {
             errno = EINVAL;
             return -1;
         }
     } else {
         errno = EINVAL;
         return -1;
     }
     return 0;
 }

 int VolumeManager::shareVolume(const char *label, const char *method) {
     Volume *v = lookupVolume(label);

     if (!v) {
         errno = ENOENT;
         return -1;
     }

     /*
      * Eventually, we'll want to support additional share back-ends,
      * some of which may work while the media is mounted. For now,
      * we just support UMS
      */
     if (strcmp(method, "ums")) {
         errno = ENOSYS;
         return -1;
     }

     if (v->getState() == Volume::State_NoMedia) {
         errno = ENODEV;
         return -1;
     }

     if (v->getState() != Volume::State_Idle) {
         // You need to unmount manually befoe sharing
         errno = EBUSY;
         return -1;
     }

     dev_t d = v->getDiskDevice();
     if ((MAJOR(d) == 0) && (MINOR(d) == 0)) {
         // This volume does not support raw disk access
         errno = EINVAL;
         return -1;
     }

     int fd;
     char nodepath[255];
     snprintf(nodepath,
              sizeof(nodepath), "/dev/block/vold/%d:%d",
              MAJOR(d), MINOR(d));

     if ((fd = open("/sys/devices/platform/usb_mass_storage/lun0/file",
                    O_WRONLY)) < 0) {
         LOGE("Unable to open ums lunfile (%s)", strerror(errno));
         return -1;
     }

     if (write(fd, nodepath, strlen(nodepath)) < 0) {
         LOGE("Unable to write to ums lunfile (%s)", strerror(errno));
         close(fd);
         return -1;
     }

     close(fd);
     v->handleVolumeShared();
     return 0;
 }

 int VolumeManager::unshareVolume(const char *label, const char *method) {
     Volume *v = lookupVolume(label);

     if (!v) {
         errno = ENOENT;
         return -1;
     }

     if (strcmp(method, "ums")) {
         errno = ENOSYS;
         return -1;
     }

     if (v->getState() != Volume::State_Shared) {
         errno = EINVAL;
         return -1;
     }

     dev_t d = v->getDiskDevice();

     int fd;
     char nodepath[255];
     snprintf(nodepath,
              sizeof(nodepath), "/dev/block/vold/%d:%d",
              MAJOR(d), MINOR(d));

     if ((fd = open("/sys/devices/platform/usb_mass_storage/lun0/file", O_WRONLY)) < 0) {
         LOGE("Unable to open ums lunfile (%s)", strerror(errno));
         return -1;
     }

     char ch = 0;
     if (write(fd, &ch, 1) < 0) {
         LOGE("Unable to write to ums lunfile (%s)", strerror(errno));
         close(fd);
         return -1;
     }

     close(fd);
     v->handleVolumeUnshared();
     return 0;
 }

 int VolumeManager::unmountVolume(const char *label) {
     Volume *v = lookupVolume(label);

     if (!v) {
         errno = ENOENT;
         return -1;
     }

     if (v->getState() == Volume::State_NoMedia) {
         errno = ENODEV;
         return -1;
     }

     if (v->getState() != Volume::State_Mounted) {
         LOGW("Attempt to unmount volume which isn't mounted (%d)\n",
              v->getState());
         errno = EBUSY;
         return -1;
     }

     while(mActiveContainers->size()) {
         AsecIdCollection::iterator it = mActiveContainers->begin();
         LOGI("Unmounting ASEC %s (dependant on %s)", *it, v->getMountpoint());
         if (unmountAsec(*it)) {
             LOGE("Failed to unmount ASEC %s (%s) - unmount of %s may fail!", *it,
                  strerror(errno), v->getMountpoint());
         }
     }

     return v->unmountVol();
 }

 /*
  * Looks up a volume by it's label or mount-point
  */
 Volume *VolumeManager::lookupVolume(const char *label) {
     VolumeCollection::iterator i;

     for (i = mVolumes->begin(); i != mVolumes->end(); ++i) {
         if (label[0] == '/') {
             if (!strcmp(label, (*i)->getMountpoint()))
                 return (*i);
         } else {
             if (!strcmp(label, (*i)->getLabel()))
                 return (*i);
         }
     }
     return NULL;
 }

 bool VolumeManager::isMountpointMounted(const char *mp)
 {
     char device[256];
     char mount_path[256];
     char rest[256];
     FILE *fp;
     char line[1024];

     if (!(fp = fopen("/proc/mounts", "r"))) {
         LOGE("Error opening /proc/mounts (%s)", strerror(errno));
         return false;
     }

     while(fgets(line, sizeof(line), fp)) {
         line[strlen(line)-1] = '\0';
         sscanf(line, "%255s %255s %255s\n", device, mount_path, rest);
         if (!strcmp(mount_path, mp)) {
             fclose(fp);
             return true;
         }

     }

     fclose(fp);
     return false;
 }
	/*
	* Copyright (C) 2008 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <errno.h>
	#include <fcntl.h>
	#include <sys/stat.h>
	#include <sys/types.h>
	#include <sys/mount.h>

	#include <linux/kdev_t.h>

	#define LOG_TAG "Vold"

	#include <cutils/log.h>

	#include <sysutils/NetlinkEvent.h>

	#include "VolumeManager.h"
	#include "DirectVolume.h"
	#include "ResponseCode.h"
	#include "Loop.h"
	#include "Fat.h"
	#include "Devmapper.h"

	extern "C" void KillProcessesWithOpenFiles(const char *, int, int, int);

	VolumeManager *VolumeManager::sInstance = NULL;

	VolumeManager *VolumeManager::Instance() {
	if (!sInstance)
	sInstance = new VolumeManager();
	return sInstance;
	}

	VolumeManager::VolumeManager() {
	mBlockDevices = new BlockDeviceCollection();
	mVolumes = new VolumeCollection();
	mActiveContainers = new AsecIdCollection();
	mBroadcaster = NULL;
	mUsbMassStorageConnected = false;
	}

	VolumeManager::~VolumeManager() {
	delete mBlockDevices;
	delete mVolumes;
	delete mActiveContainers;
	}

	int VolumeManager::start() {
	return 0;
	}

	int VolumeManager::stop() {
	return 0;
	}

	int VolumeManager::addVolume(Volume *v) {
	mVolumes->push_back(v);
	return 0;
	}

	void VolumeManager::notifyUmsConnected(bool connected) {
	char msg[255];

	if (connected) {
	mUsbMassStorageConnected = true;
	} else {
	mUsbMassStorageConnected = false;
	}
	snprintf(msg, sizeof(msg), "Share method ums now %s",
	(connected ? "available" : "unavailable"));

	getBroadcaster()->sendBroadcast(ResponseCode::ShareAvailabilityChange,
	msg, false);
	}

	void VolumeManager::handleSwitchEvent(NetlinkEvent *evt) {
	const char *devpath = evt->findParam("DEVPATH");
	const char *name = evt->findParam("SWITCH_NAME");
	const char *state = evt->findParam("SWITCH_STATE");

	if (!name \|\| !state) {
	LOGW("Switch %s event missing name/state info", devpath);
	return;
	}

	if (!strcmp(name, "usb_mass_storage")) {

	if (!strcmp(state, "online")) {
	notifyUmsConnected(true);
	} else {
	notifyUmsConnected(false);
	}
	} else {
	LOGW("Ignoring unknown switch '%s'", name);
	}
	}

	void VolumeManager::handleBlockEvent(NetlinkEvent *evt) {
	const char *devpath = evt->findParam("DEVPATH");

	/* Lookup a volume to handle this device */
	VolumeCollection::iterator it;
	bool hit = false;
	for (it = mVolumes->begin(); it != mVolumes->end(); ++it) {
	if (!(*it)->handleBlockEvent(evt)) {
	#ifdef NETLINK_DEBUG
	LOGD("Device '%s' event handled by volume %s\n", devpath, (*it)->getLabel());
	#endif
	hit = true;
	break;
	}
	}

	if (!hit) {
	#ifdef NETLINK_DEBUG
	LOGW("No volumes handled block event for '%s'", devpath);
	#endif
	}
	}

	int VolumeManager::listVolumes(SocketClient *cli) {
	VolumeCollection::iterator i;

	for (i = mVolumes->begin(); i != mVolumes->end(); ++i) {
	char *buffer;
	asprintf(&buffer, "%s %s %d",
	(i)->getLabel(), (i)->getMountpoint(),
	(*i)->getState());
	cli->sendMsg(ResponseCode::VolumeListResult, buffer, false);
	free(buffer);
	}
	cli->sendMsg(ResponseCode::CommandOkay, "Volumes listed.", false);
	return 0;
	}

	int VolumeManager::formatVolume(const char *label) {
	Volume *v = lookupVolume(label);

	if (!v) {
	errno = ENOENT;
	return -1;
	}

	return v->formatVol();
	}

	int VolumeManager::getAsecMountPath(const char id, char buffer, int maxlen) {
	char mountPoint[255];

	snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);

	if (!isMountpointMounted(mountPoint)) {
	errno = ENOENT;
	return -1;
	}
	snprintf(buffer, maxlen, "/asec/%s", id);
	return 0;
	}

	int VolumeManager::createAsec(const char *id, unsigned int numSectors,
	const char fstype, const char key, int ownerUid) {

	mkdir("/sdcard/android_secure", 0777);

	if (lookupVolume(id)) {
	LOGE("ASEC volume '%s' currently exists", id);
	errno = EADDRINUSE;
	return -1;
	}

	char asecFileName[255];
	snprintf(asecFileName, sizeof(asecFileName),
	"/sdcard/android_secure/%s.asec", id);

	if (!access(asecFileName, F_OK)) {
	LOGE("ASEC file '%s' currently exists - destroy it first! (%s)",
	asecFileName, strerror(errno));
	errno = EADDRINUSE;
	return -1;
	}

	if (Loop::createImageFile(asecFileName, numSectors)) {
	LOGE("ASEC image file creation failed (%s)", strerror(errno));
	return -1;
	}

	char loopDevice[255];
	if (Loop::create(asecFileName, loopDevice, sizeof(loopDevice))) {
	LOGE("ASEC loop device creation failed (%s)", strerror(errno));
	unlink(asecFileName);
	return -1;
	}

	char dmDevice[255];
	bool cleanupDm = false;

	if (strcmp(key, "none")) {
	if (Devmapper::create(id, loopDevice, key, numSectors, dmDevice,
	sizeof(dmDevice))) {
	LOGE("ASEC device mapping failed (%s)", strerror(errno));
	Loop::destroyByDevice(loopDevice);
	unlink(asecFileName);
	return -1;
	}
	cleanupDm = true;
	} else {
	strcpy(dmDevice, loopDevice);
	}

	if (Fat::format(dmDevice)) {
	LOGE("ASEC FAT format failed (%s)", strerror(errno));
	if (cleanupDm) {
	Devmapper::destroy(id);
	}
	Loop::destroyByDevice(loopDevice);
	unlink(asecFileName);
	return -1;
	}

	char mountPoint[255];

	snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);
	if (mkdir(mountPoint, 0777)) {
	if (errno != EEXIST) {
	LOGE("Mountpoint creation failed (%s)", strerror(errno));
	if (cleanupDm) {
	Devmapper::destroy(id);
	}
	Loop::destroyByDevice(loopDevice);
	unlink(asecFileName);
	return -1;
	}
	}

	if (Fat::doMount(dmDevice, mountPoint, false, false, ownerUid,
	0, 0000, false)) {
	// 0, 0007, false)) {
	LOGE("ASEC FAT mount failed (%s)", strerror(errno));
	if (cleanupDm) {
	Devmapper::destroy(id);
	}
	Loop::destroyByDevice(loopDevice);
	unlink(asecFileName);
	return -1;
	}

	mActiveContainers->push_back(strdup(id));
	return 0;
	}

	int VolumeManager::finalizeAsec(const char *id) {
	char asecFileName[255];
	char loopDevice[255];
	char mountPoint[255];

	snprintf(asecFileName, sizeof(asecFileName),
	"/sdcard/android_secure/%s.asec", id);

	if (Loop::lookupActive(asecFileName, loopDevice, sizeof(loopDevice))) {
	LOGE("Unable to finalize %s (%s)", id, strerror(errno));
	return -1;
	}

	snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);
	// XXX:
	if (Fat::doMount(loopDevice, mountPoint, true, true, 0, 0, 0227, false)) {
	LOGE("ASEC finalize mount failed (%s)", strerror(errno));
	return -1;
	}

	LOGD("ASEC %s finalized", id);
	return 0;
	}

	int VolumeManager::unmountAsec(const char *id) {
	char asecFileName[255];
	char mountPoint[255];

	snprintf(asecFileName, sizeof(asecFileName),
	"/sdcard/android_secure/%s.asec", id);
	snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);

	if (!isMountpointMounted(mountPoint)) {
	LOGE("Unmount request for ASEC %s when not mounted", id);
	errno = EINVAL;
	return -1;
	}

	int i, rc;
	for (i = 0; i < 10; i++) {
	rc = umount(mountPoint);
	if (!rc) {
	break;
	}
	if (rc && (errno == EINVAL \|\| errno == ENOENT)) {
	rc = 0;
	break;
	}
	LOGW("ASEC %s unmount attempt %d failed (%s)",
	id, i +1, strerror(errno));

	if (i >= 5) {
	KillProcessesWithOpenFiles(mountPoint, (i < 7 ? 0 : 1),
	NULL, 0);
	}
	usleep(1000 * 250);
	}

	if (rc) {
	LOGE("Failed to unmount ASEC %s", id);
	return -1;
	}

	unlink(mountPoint);

	if (Devmapper::destroy(id) && errno != ENXIO) {
	LOGE("Failed to destroy devmapper instance (%s)", strerror(errno));
	}

	char loopDevice[255];
	if (!Loop::lookupActive(asecFileName, loopDevice, sizeof(loopDevice))) {
	Loop::destroyByDevice(loopDevice);
	}

	AsecIdCollection::iterator it;
	for (it = mActiveContainers->begin(); it != mActiveContainers->end(); ++it) {
	if (!strcmp(*it, id)) {
	free(*it);
	mActiveContainers->erase(it);
	break;
	}
	}
	if (it == mActiveContainers->end()) {
	LOGW("mActiveContainers is inconsistent!");
	}
	return 0;
	}

	int VolumeManager::destroyAsec(const char *id) {
	char asecFileName[255];
	char mountPoint[255];

	snprintf(asecFileName, sizeof(asecFileName),
	"/sdcard/android_secure/%s.asec", id);
	snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);

	if (isMountpointMounted(mountPoint)) {
	if (unmountAsec(id)) {
	LOGE("Failed to unmount asec %s for destroy (%s)", id, strerror(errno));
	return -1;
	}
	}

	if (unlink(asecFileName)) {
	LOGE("Failed to unlink asec %s (%s)", id, strerror(errno));
	return -1;
	}

	LOGD("ASEC %s destroyed", id);
	return 0;
	}

	int VolumeManager::mountAsec(const char id, const char key, int ownerUid) {
	char asecFileName[255];
	char mountPoint[255];

	snprintf(asecFileName, sizeof(asecFileName),
	"/sdcard/android_secure/%s.asec", id);
	snprintf(mountPoint, sizeof(mountPoint), "/asec/%s", id);

	if (isMountpointMounted(mountPoint)) {
	LOGE("ASEC %s already mounted", id);
	errno = EBUSY;
	return -1;
	}

	char loopDevice[255];
	if (Loop::lookupActive(asecFileName, loopDevice, sizeof(loopDevice))) {
	if (Loop::create(asecFileName, loopDevice, sizeof(loopDevice))) {
	LOGE("ASEC loop device creation failed (%s)", strerror(errno));
	return -1;
	}
	LOGD("New loop device created at %s", loopDevice);
	} else {
	LOGD("Found active loopback for %s at %s", asecFileName, loopDevice);
	}

	char dmDevice[255];
	bool cleanupDm = false;
	if (strcmp(key, "none")) {
	if (Devmapper::lookupActive(id, dmDevice, sizeof(dmDevice))) {
	unsigned int nr_sec = 0;
	int fd;

	if ((fd = open(loopDevice, O_RDWR)) < 0) {
	LOGE("Failed to open loopdevice (%s)", strerror(errno));
	Loop::destroyByDevice(loopDevice);
	return -1;
	}

	if (ioctl(fd, BLKGETSIZE, &nr_sec)) {
	LOGE("Failed to get loop size (%s)", strerror(errno));
	Loop::destroyByDevice(loopDevice);
	close(fd);
	return -1;
	}
	close(fd);
	if (Devmapper::create(id, loopDevice, key, nr_sec,
	dmDevice, sizeof(dmDevice))) {
	LOGE("ASEC device mapping failed (%s)", strerror(errno));
	Loop::destroyByDevice(loopDevice);
	return -1;
	}
	LOGD("New devmapper instance created at %s", dmDevice);
	} else {
	LOGD("Found active devmapper for %s at %s", asecFileName, dmDevice);
	}
	cleanupDm = true;
	} else {
	strcpy(dmDevice, loopDevice);
	}

	if (mkdir(mountPoint, 0777)) {
	if (errno != EEXIST) {
	LOGE("Mountpoint creation failed (%s)", strerror(errno));
	if (cleanupDm) {
	Devmapper::destroy(id);
	}
	Loop::destroyByDevice(loopDevice);
	return -1;
	}
	}

	if (Fat::doMount(dmDevice, mountPoint, true, false, ownerUid, 0,
	0222, false)) {
	// 0227, false)) {
	LOGE("ASEC mount failed (%s)", strerror(errno));
	if (cleanupDm) {
	Devmapper::destroy(id);
	}
	Loop::destroyByDevice(loopDevice);
	return -1;
	}

	mActiveContainers->push_back(strdup(id));
	LOGD("ASEC %s mounted", id);
	return 0;
	}

	int VolumeManager::mountVolume(const char *label) {
	Volume *v = lookupVolume(label);

	if (!v) {
	errno = ENOENT;
	return -1;
	}

	return v->mountVol();
	}

	int VolumeManager::shareAvailable(const char method, bool avail) {

	if (strcmp(method, "ums")) {
	errno = ENOSYS;
	return -1;
	}

	if (mUsbMassStorageConnected)
	*avail = true;
	else
	*avail = false;
	return 0;
	}

	int VolumeManager::simulate(const char cmd, const char arg) {

	if (!strcmp(cmd, "ums")) {
	if (!strcmp(arg, "connect")) {
	notifyUmsConnected(true);
	} else if (!strcmp(arg, "disconnect")) {
	notifyUmsConnected(false);
	} else {
	errno = EINVAL;
	return -1;
	}
	} else {
	errno = EINVAL;
	return -1;
	}
	return 0;
	}

	int VolumeManager::shareVolume(const char label, const char method) {
	Volume *v = lookupVolume(label);

	if (!v) {
	errno = ENOENT;
	return -1;
	}

	/*
	* Eventually, we'll want to support additional share back-ends,
	* some of which may work while the media is mounted. For now,
	* we just support UMS
	*/
	if (strcmp(method, "ums")) {
	errno = ENOSYS;
	return -1;
	}

	if (v->getState() == Volume::State_NoMedia) {
	errno = ENODEV;
	return -1;
	}

	if (v->getState() != Volume::State_Idle) {
	// You need to unmount manually befoe sharing
	errno = EBUSY;
	return -1;
	}

	dev_t d = v->getDiskDevice();
	if ((MAJOR(d) == 0) && (MINOR(d) == 0)) {
	// This volume does not support raw disk access
	errno = EINVAL;
	return -1;
	}

	int fd;
	char nodepath[255];
	snprintf(nodepath,
	sizeof(nodepath), "/dev/block/vold/%d:%d",
	MAJOR(d), MINOR(d));

	if ((fd = open("/sys/devices/platform/usb_mass_storage/lun0/file",
	O_WRONLY)) < 0) {
	LOGE("Unable to open ums lunfile (%s)", strerror(errno));
	return -1;
	}

	if (write(fd, nodepath, strlen(nodepath)) < 0) {
	LOGE("Unable to write to ums lunfile (%s)", strerror(errno));
	close(fd);
	return -1;
	}

	close(fd);
	v->handleVolumeShared();
	return 0;
	}

	int VolumeManager::unshareVolume(const char label, const char method) {
	Volume *v = lookupVolume(label);

	if (!v) {
	errno = ENOENT;
	return -1;
	}

	if (strcmp(method, "ums")) {
	errno = ENOSYS;
	return -1;
	}

	if (v->getState() != Volume::State_Shared) {
	errno = EINVAL;
	return -1;
	}

	dev_t d = v->getDiskDevice();

	int fd;
	char nodepath[255];
	snprintf(nodepath,
	sizeof(nodepath), "/dev/block/vold/%d:%d",
	MAJOR(d), MINOR(d));

	if ((fd = open("/sys/devices/platform/usb_mass_storage/lun0/file", O_WRONLY)) < 0) {
	LOGE("Unable to open ums lunfile (%s)", strerror(errno));
	return -1;
	}

	char ch = 0;
	if (write(fd, &ch, 1) < 0) {
	LOGE("Unable to write to ums lunfile (%s)", strerror(errno));
	close(fd);
	return -1;
	}

	close(fd);
	v->handleVolumeUnshared();
	return 0;
	}

	int VolumeManager::unmountVolume(const char *label) {
	Volume *v = lookupVolume(label);

	if (!v) {
	errno = ENOENT;
	return -1;
	}

	if (v->getState() == Volume::State_NoMedia) {
	errno = ENODEV;
	return -1;
	}

	if (v->getState() != Volume::State_Mounted) {
	LOGW("Attempt to unmount volume which isn't mounted (%d)\n",
	v->getState());
	errno = EBUSY;
	return -1;
	}

	while(mActiveContainers->size()) {
	AsecIdCollection::iterator it = mActiveContainers->begin();
	LOGI("Unmounting ASEC %s (dependant on %s)", *it, v->getMountpoint());
	if (unmountAsec(*it)) {
	LOGE("Failed to unmount ASEC %s (%s) - unmount of %s may fail!", *it,
	strerror(errno), v->getMountpoint());
	}
	}

	return v->unmountVol();
	}

	/*
	* Looks up a volume by it's label or mount-point
	*/
	Volume VolumeManager::lookupVolume(const char label) {
	VolumeCollection::iterator i;

	for (i = mVolumes->begin(); i != mVolumes->end(); ++i) {
	if (label[0] == '/') {
	if (!strcmp(label, (*i)->getMountpoint()))
	return (*i);
	} else {
	if (!strcmp(label, (*i)->getLabel()))
	return (*i);
	}
	}
	return NULL;
	}

	bool VolumeManager::isMountpointMounted(const char *mp)
	{
	char device[256];
	char mount_path[256];
	char rest[256];
	FILE *fp;
	char line[1024];

	if (!(fp = fopen("/proc/mounts", "r"))) {
	LOGE("Error opening /proc/mounts (%s)", strerror(errno));
	return false;
	}

	while(fgets(line, sizeof(line), fp)) {
	line[strlen(line)-1] = '\0';
	sscanf(line, "%255s %255s %255s\n", device, mount_path, rest);
	if (!strcmp(mount_path, mp)) {
	fclose(fp);
	return true;
	}

	}

	fclose(fp);
	return false;
	}