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337 lines
7.9 KiB
337 lines
7.9 KiB
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/kdev_t.h>
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#define LOG_TAG "Vold"
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#include <cutils/log.h>
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#include <sysutils/NetlinkEvent.h>
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#include "VolumeManager.h"
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#include "DirectVolume.h"
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#include "ResponseCode.h"
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VolumeManager *VolumeManager::sInstance = NULL;
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VolumeManager *VolumeManager::Instance() {
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if (!sInstance)
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sInstance = new VolumeManager();
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return sInstance;
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}
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VolumeManager::VolumeManager() {
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mBlockDevices = new BlockDeviceCollection();
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mVolumes = new VolumeCollection();
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mBroadcaster = NULL;
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mUsbMassStorageConnected = false;
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}
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VolumeManager::~VolumeManager() {
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delete mBlockDevices;
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}
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int VolumeManager::start() {
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return 0;
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}
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int VolumeManager::stop() {
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return 0;
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}
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int VolumeManager::addVolume(Volume *v) {
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mVolumes->push_back(v);
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return 0;
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}
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void VolumeManager::notifyUmsConnected(bool connected) {
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char msg[255];
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if (connected) {
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mUsbMassStorageConnected = true;
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} else {
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mUsbMassStorageConnected = false;
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}
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snprintf(msg, sizeof(msg), "Share method ums now %s",
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(connected ? "available" : "unavailable"));
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getBroadcaster()->sendBroadcast(ResponseCode::ShareAvailabilityChange,
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msg, false);
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}
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void VolumeManager::handleSwitchEvent(NetlinkEvent *evt) {
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const char *devpath = evt->findParam("DEVPATH");
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const char *name = evt->findParam("SWITCH_NAME");
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const char *state = evt->findParam("SWITCH_STATE");
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if (!name || !state) {
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LOGW("Switch %s event missing name/state info", devpath);
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return;
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}
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if (!strcmp(name, "usb_mass_storage")) {
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if (!strcmp(state, "online")) {
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notifyUmsConnected(true);
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} else {
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notifyUmsConnected(false);
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}
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} else {
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LOGW("Ignoring unknown switch '%s'", name);
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}
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}
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void VolumeManager::handleBlockEvent(NetlinkEvent *evt) {
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const char *devpath = evt->findParam("DEVPATH");
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/* Lookup a volume to handle this device */
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VolumeCollection::iterator it;
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bool hit = false;
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for (it = mVolumes->begin(); it != mVolumes->end(); ++it) {
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if (!(*it)->handleBlockEvent(evt)) {
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#ifdef NETLINK_DEBUG
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LOGD("Device '%s' event handled by volume %s\n", devpath, (*it)->getLabel());
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#endif
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hit = true;
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break;
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}
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}
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if (!hit) {
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#ifdef NETLINK_DEBUG
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LOGW("No volumes handled block event for '%s'", devpath);
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#endif
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}
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}
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int VolumeManager::listVolumes(SocketClient *cli) {
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VolumeCollection::iterator i;
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for (i = mVolumes->begin(); i != mVolumes->end(); ++i) {
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char *buffer;
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asprintf(&buffer, "%s %s %d",
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(*i)->getLabel(), (*i)->getMountpoint(),
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(*i)->getState());
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cli->sendMsg(ResponseCode::VolumeListResult, buffer, false);
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free(buffer);
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}
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cli->sendMsg(ResponseCode::CommandOkay, "Volumes listed.", false);
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return 0;
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}
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int VolumeManager::formatVolume(const char *label) {
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Volume *v = lookupVolume(label);
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if (!v) {
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errno = ENOENT;
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return -1;
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}
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return v->formatVol();
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}
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int VolumeManager::mountVolume(const char *label) {
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Volume *v = lookupVolume(label);
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if (!v) {
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errno = ENOENT;
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return -1;
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}
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return v->mountVol();
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}
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int VolumeManager::shareAvailable(const char *method, bool *avail) {
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if (strcmp(method, "ums")) {
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errno = ENOSYS;
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return -1;
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}
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if (mUsbMassStorageConnected)
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*avail = true;
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else
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*avail = false;
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return 0;
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}
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int VolumeManager::simulate(const char *cmd, const char *arg) {
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if (!strcmp(cmd, "ums")) {
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if (!strcmp(arg, "connect")) {
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notifyUmsConnected(true);
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} else if (!strcmp(arg, "disconnect")) {
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notifyUmsConnected(false);
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} else {
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errno = EINVAL;
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return -1;
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}
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} else {
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errno = EINVAL;
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return -1;
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}
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return 0;
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}
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int VolumeManager::shareVolume(const char *label, const char *method) {
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Volume *v = lookupVolume(label);
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if (!v) {
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errno = ENOENT;
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return -1;
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}
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/*
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* Eventually, we'll want to support additional share back-ends,
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* some of which may work while the media is mounted. For now,
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* we just support UMS
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*/
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if (strcmp(method, "ums")) {
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errno = ENOSYS;
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return -1;
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}
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if (v->getState() == Volume::State_NoMedia) {
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errno = ENODEV;
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return -1;
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}
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if (v->getState() != Volume::State_Idle) {
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// You need to unmount manually befoe sharing
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errno = EBUSY;
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return -1;
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}
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dev_t d = v->getDiskDevice();
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if ((MAJOR(d) == 0) && (MINOR(d) == 0)) {
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// This volume does not support raw disk access
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errno = EINVAL;
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return -1;
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}
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int fd;
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char nodepath[255];
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snprintf(nodepath,
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sizeof(nodepath), "/dev/block/vold/%d:%d",
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MAJOR(d), MINOR(d));
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if ((fd = open("/sys/devices/platform/usb_mass_storage/lun0/file",
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O_WRONLY)) < 0) {
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LOGE("Unable to open ums lunfile (%s)", strerror(errno));
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return -1;
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}
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if (write(fd, nodepath, strlen(nodepath)) < 0) {
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LOGE("Unable to write to ums lunfile (%s)", strerror(errno));
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close(fd);
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return -1;
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}
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close(fd);
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v->handleVolumeShared();
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return 0;
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}
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int VolumeManager::unshareVolume(const char *label, const char *method) {
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Volume *v = lookupVolume(label);
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if (!v) {
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errno = ENOENT;
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return -1;
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}
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if (strcmp(method, "ums")) {
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errno = ENOSYS;
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return -1;
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}
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if (v->getState() != Volume::State_Shared) {
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errno = EINVAL;
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return -1;
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}
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dev_t d = v->getDiskDevice();
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int fd;
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char nodepath[255];
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snprintf(nodepath,
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sizeof(nodepath), "/dev/block/vold/%d:%d",
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MAJOR(d), MINOR(d));
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if ((fd = open("/sys/devices/platform/usb_mass_storage/lun0/file", O_WRONLY)) < 0) {
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LOGE("Unable to open ums lunfile (%s)", strerror(errno));
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return -1;
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}
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char ch = 0;
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if (write(fd, &ch, 1) < 0) {
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LOGE("Unable to write to ums lunfile (%s)", strerror(errno));
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close(fd);
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return -1;
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}
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close(fd);
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v->handleVolumeUnshared();
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return 0;
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}
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int VolumeManager::unmountVolume(const char *label) {
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Volume *v = lookupVolume(label);
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if (!v) {
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errno = ENOENT;
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return -1;
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}
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if (v->getState() == Volume::State_NoMedia) {
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errno = ENODEV;
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return -1;
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}
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if (v->getState() != Volume::State_Mounted) {
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LOGW("Attempt to unmount volume which isn't mounted (%d)\n",
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v->getState());
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errno = EBUSY;
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return -1;
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}
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return v->unmountVol();
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}
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/*
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* Looks up a volume by it's label or mount-point
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*/
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Volume *VolumeManager::lookupVolume(const char *label) {
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VolumeCollection::iterator i;
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for (i = mVolumes->begin(); i != mVolumes->end(); ++i) {
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if (label[0] == '/') {
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if (!strcmp(label, (*i)->getMountpoint()))
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return (*i);
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} else {
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if (!strcmp(label, (*i)->getLabel()))
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return (*i);
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}
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}
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return NULL;
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}
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