The Tor Browser: dom/system/gonk/AutoMounter.cpp@6474c204b198 (annotated)

dom/system/gonk/AutoMounter.cpp@6474c204b198 (annotated)

dom/system/gonk/AutoMounter.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
  * You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include <errno.h>
 #include <fcntl.h>
 #include <pthread.h>
 #include <signal.h>
 #include <string.h>
 #include <strings.h>
 #include <unistd.h>
 #include <arpa/inet.h>
 #include <linux/types.h>
 #include <linux/netlink.h>
 #include <netinet/in.h>
 #include <sys/socket.h>
 #include <android/log.h>
 #include "AutoMounter.h"
 #include "nsVolumeService.h"
 #include "AutoMounterSetting.h"
 #include "base/message_loop.h"
 #include "mozilla/AutoRestore.h"
 #include "mozilla/FileUtils.h"
 #include "mozilla/Hal.h"
 #include "mozilla/StaticPtr.h"
 #include "nsAutoPtr.h"
 #include "nsMemory.h"
 #include "nsString.h"
 #include "nsThreadUtils.h"
 #include "nsXULAppAPI.h"
 #include "OpenFileFinder.h"
 #include "Volume.h"
 #include "VolumeManager.h"
 using namespace mozilla::hal;
 /**************************************************************************
 *
 * The following "switch" files are available for monitoring usb
 * connections:
 *
 *   /sys/devices/virtual/switch/usb_connected/state
 *   /sys/devices/virtual/switch/usb_configuration/state
 *
 *   Under gingerbread, only the usb_configuration seems to be available.
 *   Starting with honeycomb, usb_connected was also added.
 *
 *   When a cable insertion/removal occurs, then a uevent similar to the
 *   following will be generted:
 *
 *    change@/devices/virtual/switch/usb_configuration
 *      ACTION=change
 *      DEVPATH=/devices/virtual/switch/usb_configuration
 *      SUBSYSTEM=switch
 *      SWITCH_NAME=usb_configuration
 *      SWITCH_STATE=0
 *      SEQNUM=5038
 *
 *    SWITCH_STATE will be 0 after a removal and 1 after an insertion
 *
 **************************************************************************/
 #define USB_CONFIGURATION_SWITCH_NAME   NS_LITERAL_STRING("usb_configuration")
 #define GB_SYS_UMS_ENABLE     "/sys/devices/virtual/usb_composite/usb_mass_storage/enable"
 #define GB_SYS_USB_CONFIGURED "/sys/devices/virtual/switch/usb_configuration/state"
 #define ICS_SYS_USB_FUNCTIONS "/sys/devices/virtual/android_usb/android0/functions"
 #define ICS_SYS_UMS_DIRECTORY "/sys/devices/virtual/android_usb/android0/f_mass_storage"
 #define ICS_SYS_USB_STATE     "/sys/devices/virtual/android_usb/android0/state"
 #define USE_DEBUG 0
 #undef LOG
 #define LOG(args...)  __android_log_print(ANDROID_LOG_INFO,  "AutoMounter", ## args)
 #define LOGW(args...) __android_log_print(ANDROID_LOG_WARN,  "AutoMounter", ## args)
 #define ERR(args...)  __android_log_print(ANDROID_LOG_ERROR, "AutoMounter", ## args)
 #if USE_DEBUG
 #define DBG(args...)  __android_log_print(ANDROID_LOG_DEBUG, "AutoMounter" , ## args)
 #else
 #define DBG(args...)
 #endif
 namespace mozilla {
 namespace system {
 class AutoMounter;
 static void SetAutoMounterStatus(int32_t aStatus);
 /***************************************************************************/
 inline const char* SwitchStateStr(const SwitchEvent& aEvent)
 {
   return aEvent.status() == SWITCH_STATE_ON ? "plugged" : "unplugged";
 }
 /***************************************************************************/
 static bool
 IsUsbCablePluggedIn()
 {
 #if 0
   // Use this code when bug 745078 gets fixed (or use whatever the
   // appropriate method is)
   return GetCurrentSwitchEvent(SWITCH_USB) == SWITCH_STATE_ON;
 #else
   // Until then, just go read the file directly
   if (access(ICS_SYS_USB_STATE, F_OK) == 0) {
     char usbState[20];
     if (ReadSysFile(ICS_SYS_USB_STATE, usbState, sizeof(usbState))) {
       return strcmp(usbState, "CONFIGURED") == 0;
     }
     ERR("Error reading file '%s': %s", ICS_SYS_USB_STATE, strerror(errno));
     return false;
   }
   bool configured;
   if (ReadSysFile(GB_SYS_USB_CONFIGURED, &configured)) {
     return configured;
   }
   ERR("Error reading file '%s': %s", GB_SYS_USB_CONFIGURED, strerror(errno));
   return false;
 #endif
 }
 /***************************************************************************/
 // The AutoVolumeManagerStateObserver allows the AutoMounter to know when
 // the volume manager changes state (i.e. it has finished initialization)
 class AutoVolumeManagerStateObserver : public VolumeManager::StateObserver
 {
 public:
   virtual void Notify(const VolumeManager::StateChangedEvent& aEvent);
 };
 // The AutoVolumeEventObserver allows the AutoMounter to know about card
 // insertion and removal, as well as state changes in the volume.
 class AutoVolumeEventObserver : public Volume::EventObserver
 {
 public:
   virtual void Notify(Volume * const & aEvent);
 };
 class AutoMounterResponseCallback : public VolumeResponseCallback
 {
 public:
   AutoMounterResponseCallback()
     : mErrorCount(0)
   {
   }
 protected:
   virtual void ResponseReceived(const VolumeCommand* aCommand);
 private:
     const static int kMaxErrorCount = 3; // Max number of errors before we give up
     int   mErrorCount;
 };
 /***************************************************************************/
 class AutoMounter
 {
 public:
   NS_INLINE_DECL_REFCOUNTING(AutoMounter)
   typedef nsTArray<RefPtr<Volume>> VolumeArray;
   AutoMounter()
     : mResponseCallback(new AutoMounterResponseCallback),
       mMode(AUTOMOUNTER_DISABLE)
   {
     VolumeManager::RegisterStateObserver(&mVolumeManagerStateObserver);
     Volume::RegisterObserver(&mVolumeEventObserver);
     VolumeManager::VolumeArray::size_type numVolumes = VolumeManager::NumVolumes();
     VolumeManager::VolumeArray::index_type i;
     for (i = 0; i < numVolumes; i++) {
       RefPtr<Volume> vol = VolumeManager::GetVolume(i);
       if (vol) {
         vol->RegisterObserver(&mVolumeEventObserver);
         // We need to pick up the intial value of the
         // ums.volume.NAME.enabled setting.
         AutoMounterSetting::CheckVolumeSettings(vol->Name());
       }
     }
     DBG("Calling UpdateState from constructor");
     UpdateState();
   }
   ~AutoMounter()
   {
     VolumeManager::VolumeArray::size_type numVolumes = VolumeManager::NumVolumes();
     VolumeManager::VolumeArray::index_type volIndex;
     for (volIndex = 0; volIndex < numVolumes; volIndex++) {
       RefPtr<Volume> vol = VolumeManager::GetVolume(volIndex);
       if (vol) {
         vol->UnregisterObserver(&mVolumeEventObserver);
       }
     }
     Volume::UnregisterObserver(&mVolumeEventObserver);
     VolumeManager::UnregisterStateObserver(&mVolumeManagerStateObserver);
   }
   void UpdateState();
   const char* ModeStr(int32_t aMode)
   {
     switch (aMode) {
       case AUTOMOUNTER_DISABLE:                 return "Disable";
       case AUTOMOUNTER_ENABLE:                  return "Enable";
       case AUTOMOUNTER_DISABLE_WHEN_UNPLUGGED:  return "DisableWhenUnplugged";
     }
     return "??? Unknown ???";
   }
   void SetMode(int32_t aMode)
   {
     if ((aMode == AUTOMOUNTER_DISABLE_WHEN_UNPLUGGED) &&
         (mMode == AUTOMOUNTER_DISABLE)) {
       // If it's already disabled, then leave it as disabled.
       // AUTOMOUNTER_DISABLE_WHEN_UNPLUGGED implies "enabled until unplugged"
       aMode = AUTOMOUNTER_DISABLE;
     }
     if ((aMode == AUTOMOUNTER_DISABLE) &&
         (mMode == AUTOMOUNTER_ENABLE) && IsUsbCablePluggedIn()) {
       // On many devices (esp non-Samsung), we can't force the disable, so we
       // need to defer until the USB cable is actually unplugged.
       // See bug 777043.
       //
       // Otherwise our attempt to disable it will fail, and we'll wind up in a bad
       // state where the AutoMounter thinks that Sharing has been turned off, but
       // the files are actually still being Shared because the attempt to unshare
       // failed.
       LOG("Attempting to disable UMS. Deferring until USB cable is unplugged.");
       aMode = AUTOMOUNTER_DISABLE_WHEN_UNPLUGGED;
     }
     if (aMode != mMode) {
       LOG("Changing mode from '%s' to '%s'", ModeStr(mMode), ModeStr(aMode));
       mMode = aMode;
       DBG("Calling UpdateState due to mode set to %d", mMode);
       UpdateState();
     }
   }
   void SetSharingMode(const nsACString& aVolumeName, bool aAllowSharing)
   {
     RefPtr<Volume> vol = VolumeManager::FindVolumeByName(aVolumeName);
     if (!vol) {
       return;
     }
     if (vol->IsSharingEnabled() == aAllowSharing) {
       return;
     }
     vol->SetUnmountRequested(false);
     vol->SetMountRequested(false);
     vol->SetSharingEnabled(aAllowSharing);
     DBG("Calling UpdateState due to volume %s shareing set to %d",
         vol->NameStr(), (int)aAllowSharing);
     UpdateState();
   }
   void FormatVolume(const nsACString& aVolumeName)
   {
     RefPtr<Volume> vol = VolumeManager::FindVolumeByName(aVolumeName);
     if (!vol) {
       return;
     }
     if (vol->IsFormatRequested()) {
       return;
     }
     vol->SetUnmountRequested(false);
     vol->SetMountRequested(false);
     vol->SetFormatRequested(true);
     DBG("Calling UpdateState due to volume %s formatting set to %d",
         vol->NameStr(), (int)vol->IsFormatRequested());
     UpdateState();
   }
   void MountVolume(const nsACString& aVolumeName)
   {
     RefPtr<Volume> vol = VolumeManager::FindVolumeByName(aVolumeName);
     if (!vol) {
       return;
     }
     vol->SetUnmountRequested(false);
     if (vol->IsMountRequested() || vol->mState == nsIVolume::STATE_MOUNTED) {
       return;
     }
     vol->SetMountRequested(true);
     DBG("Calling UpdateState due to volume %s mounting set to %d",
         vol->NameStr(), (int)vol->IsMountRequested());
     UpdateState();
   }
   void UnmountVolume(const nsACString& aVolumeName)
   {
     RefPtr<Volume> vol = VolumeManager::FindVolumeByName(aVolumeName);
     if (!vol) {
       return;
     }
     if (vol->IsUnmountRequested()) {
       return;
     }
     vol->SetMountRequested(false);
     vol->SetUnmountRequested(true);
     DBG("Calling UpdateState due to volume %s unmounting set to %d",
         vol->NameStr(), (int)vol->IsUnmountRequested());
     UpdateState();
   }
 private:
   AutoVolumeEventObserver         mVolumeEventObserver;
   AutoVolumeManagerStateObserver  mVolumeManagerStateObserver;
   RefPtr<VolumeResponseCallback>  mResponseCallback;
   int32_t                         mMode;
 };
 static StaticRefPtr<AutoMounter> sAutoMounter;
 /***************************************************************************/
 void
 AutoVolumeManagerStateObserver::Notify(const VolumeManager::StateChangedEvent &)
 {
   LOG("VolumeManager state changed event: %s", VolumeManager::StateStr());
   if (!sAutoMounter) {
     return;
   }
   DBG("Calling UpdateState due to VolumeManagerStateObserver");
   sAutoMounter->UpdateState();
 }
 void
 AutoVolumeEventObserver::Notify(Volume * const &)
 {
   if (!sAutoMounter) {
     return;
   }
   DBG("Calling UpdateState due to VolumeEventStateObserver");
   sAutoMounter->UpdateState();
 }
 void
 AutoMounterResponseCallback::ResponseReceived(const VolumeCommand* aCommand)
 {
   if (WasSuccessful()) {
     DBG("Calling UpdateState due to Volume::OnSuccess");
     mErrorCount = 0;
     sAutoMounter->UpdateState();
     return;
   }
   ERR("Command '%s' failed: %d '%s'",
       aCommand->CmdStr(), ResponseCode(), ResponseStr().get());
   if (++mErrorCount < kMaxErrorCount) {
     DBG("Calling UpdateState due to VolumeResponseCallback::OnError");
     sAutoMounter->UpdateState();
   }
 }
 /***************************************************************************/
 void
 AutoMounter::UpdateState()
 {
   static bool inUpdateState = false;
   if (inUpdateState) {
     // When UpdateState calls SetISharing, this causes a volume state
     // change to occur, which would normally cause UpdateState to be called
     // again. We want the volume state change to go out (so that device
     // storage will see the change in sharing state), but since we're
     // already in UpdateState we just want to prevent recursion from screwing
     // things up.
     return;
   }
   AutoRestore<bool> inUpdateStateDetector(inUpdateState);
   inUpdateState = true;
   MOZ_ASSERT(MessageLoop::current() == XRE_GetIOMessageLoop());
   // If the following preconditions are met:
   //    - UMS is available (i.e. compiled into the kernel)
   //    - UMS is enabled
   //    - AutoMounter is enabled
   //    - USB cable is plugged in
   //  then we will try to unmount and share
   //  otherwise we will try to unshare and mount.
   if (VolumeManager::State() != VolumeManager::VOLUMES_READY) {
     // The volume manager isn't in a ready state, so there
     // isn't anything else that we can do.
     LOG("UpdateState: VolumeManager not ready yet");
     return;
   }
   if (mResponseCallback->IsPending()) {
     // We only deal with one outstanding volume command at a time,
     // so we need to wait for it to finish.
     return;
   }
   bool  umsAvail = false;
   bool  umsEnabled = false;
   if (access(ICS_SYS_USB_FUNCTIONS, F_OK) == 0) {
     umsAvail = (access(ICS_SYS_UMS_DIRECTORY, F_OK) == 0);
     if (umsAvail) {
       char functionsStr[60];
       if (ReadSysFile(ICS_SYS_USB_FUNCTIONS, functionsStr, sizeof(functionsStr))) {
         umsEnabled = strstr(functionsStr, "mass_storage") != nullptr;
       } else {
         ERR("Error reading file '%s': %s", ICS_SYS_USB_FUNCTIONS, strerror(errno));
         umsEnabled = false;
       }
     } else {
       umsEnabled = false;
     }
   } else {
     umsAvail = ReadSysFile(GB_SYS_UMS_ENABLE, &umsEnabled);
   }
   bool usbCablePluggedIn = IsUsbCablePluggedIn();
   bool enabled = (mMode == AUTOMOUNTER_ENABLE);
   if (mMode == AUTOMOUNTER_DISABLE_WHEN_UNPLUGGED) {
     enabled = usbCablePluggedIn;
     if (!usbCablePluggedIn) {
       mMode = AUTOMOUNTER_DISABLE;
     }
   }
   bool tryToShare = (umsAvail && umsEnabled && enabled && usbCablePluggedIn);
   LOG("UpdateState: umsAvail:%d umsEnabled:%d mode:%d usbCablePluggedIn:%d tryToShare:%d",
       umsAvail, umsEnabled, mMode, usbCablePluggedIn, tryToShare);
   bool filesOpen = false;
   static unsigned filesOpenDelayCount = 0;
   VolumeArray::index_type volIndex;
   VolumeArray::size_type  numVolumes = VolumeManager::NumVolumes();
   for (volIndex = 0; volIndex < numVolumes; volIndex++) {
     RefPtr<Volume>  vol = VolumeManager::GetVolume(volIndex);
     Volume::STATE   volState = vol->State();
     if (vol->State() == nsIVolume::STATE_MOUNTED) {
       LOG("UpdateState: Volume %s is %s and %s @ %s gen %d locked %d sharing %c",
           vol->NameStr(), vol->StateStr(),
           vol->MediaPresent() ? "inserted" : "missing",
           vol->MountPoint().get(), vol->MountGeneration(),
           (int)vol->IsMountLocked(),
           vol->CanBeShared() ? (vol->IsSharingEnabled() ? 'y' : 'n') : 'x');
     } else {
       LOG("UpdateState: Volume %s is %s and %s", vol->NameStr(), vol->StateStr(),
           vol->MediaPresent() ? "inserted" : "missing");
     }
     if (!vol->MediaPresent()) {
       // No media - nothing we can do
       continue;
     }
     if ((tryToShare && vol->IsSharingEnabled()) ||
         vol->IsFormatRequested() ||
         vol->IsUnmountRequested()) {
       switch (volState) {
         // We're going to try to unmount the volume
         case nsIVolume::STATE_MOUNTED: {
           if (vol->IsMountLocked()) {
             // The volume is currently locked, so leave it in the mounted
             // state.
             LOGW("UpdateState: Mounted volume %s is locked, not sharing or formatting",
                  vol->NameStr());
             break;
           }
           // Mark the volume as if we've started sharing. This will cause
           // apps which watch device storage notifications to see the volume
           // go into the shared state, and prompt them to close any open files
           // that they might have.
           if (tryToShare && vol->IsSharingEnabled()) {
             vol->SetIsSharing(true);
           } else if (vol->IsFormatRequested()){
             vol->SetIsFormatting(true);
           }
           // Check to see if there are any open files on the volume and
           // don't initiate the unmount while there are open files.
           OpenFileFinder::Info fileInfo;
           OpenFileFinder fileFinder(vol->MountPoint());
           if (fileFinder.First(&fileInfo)) {
             LOGW("The following files are open under '%s'",
                  vol->MountPoint().get());
             do {
               LOGW("  PID: %d file: '%s' app: '%s' comm: '%s' exe: '%s'\n",
                    fileInfo.mPid,
                    fileInfo.mFileName.get(),
                    fileInfo.mAppName.get(),
                    fileInfo.mComm.get(),
                    fileInfo.mExe.get());
             } while (fileFinder.Next(&fileInfo));
             LOGW("UpdateState: Mounted volume %s has open files, not sharing or formatting",
                  vol->NameStr());
             // Check again in a few seconds to see if the files are closed.
             // Since we're trying to share the volume, this implies that we're
             // plugged into the PC via USB and this in turn implies that the
             // battery is charging, so we don't need to be too concerned about
             // wasting battery here.
             //
             // If we just detected that there were files open, then we use
             // a short timer. We will have told the apps that we're trying
             // trying to share, and they'll be closing their files. This makes
             // the sharing more responsive. If after a few seconds, the apps
             // haven't closed their files, then we back off.
             int delay = 1000;
             if (filesOpenDelayCount > 10) {
               delay = 5000;
             }
             MessageLoopForIO::current()->
               PostDelayedTask(FROM_HERE,
                               NewRunnableMethod(this, &AutoMounter::UpdateState),
                               delay);
             filesOpen = true;
             break;
           }
           // Volume is mounted, we need to unmount before
           // we can share.
           LOG("UpdateState: Unmounting %s", vol->NameStr());
           vol->StartUnmount(mResponseCallback);
           return; // UpdateState will be called again when the Unmount command completes
         }
         case nsIVolume::STATE_IDLE: {
           LOG("UpdateState: Volume %s is nsIVolume::STATE_IDLE", vol->NameStr());
           if (vol->IsFormatting() && !vol->IsFormatRequested()) {
             vol->SetFormatRequested(false);
             LOG("UpdateState: Mounting %s", vol->NameStr());
             vol->StartMount(mResponseCallback);
             break;
           }
           if (tryToShare && vol->IsSharingEnabled()) {
             // Volume is unmounted. We can go ahead and share.
             LOG("UpdateState: Sharing %s", vol->NameStr());
             vol->StartShare(mResponseCallback);
           } else if (vol->IsFormatRequested()){
             // Volume is unmounted. We can go ahead and format.
             LOG("UpdateState: Formatting %s", vol->NameStr());
             vol->StartFormat(mResponseCallback);
           }
           return; // UpdateState will be called again when the Share/Format command completes
         }
         default: {
           // Not in a state that we can do anything about.
           break;
         }
       }
     } else {
       // We're going to try and unshare and remount the volumes
       switch (volState) {
         case nsIVolume::STATE_SHARED: {
           // Volume is shared. We can go ahead and unshare.
           LOG("UpdateState: Unsharing %s", vol->NameStr());
           vol->StartUnshare(mResponseCallback);
           return; // UpdateState will be called again when the Unshare command completes
         }
         case nsIVolume::STATE_IDLE: {
           if (!vol->IsUnmountRequested()) {
             // Volume is unmounted and mount-requested, try to mount.
             LOG("UpdateState: Mounting %s", vol->NameStr());
             vol->StartMount(mResponseCallback);
           }
           return; // UpdateState will be called again when Mount command completes
         }
         default: {
           // Not in a state that we can do anything about.
           break;
         }
       }
     }
   }
   int32_t status = AUTOMOUNTER_STATUS_DISABLED;
   if (filesOpen) {
     filesOpenDelayCount++;
     status = AUTOMOUNTER_STATUS_FILES_OPEN;
   } else if (enabled) {
     filesOpenDelayCount = 0;
     status = AUTOMOUNTER_STATUS_ENABLED;
   }
   SetAutoMounterStatus(status);
 }
 /***************************************************************************/
 static void
 InitAutoMounterIOThread()
 {
   MOZ_ASSERT(MessageLoop::current() == XRE_GetIOMessageLoop());
   MOZ_ASSERT(!sAutoMounter);
   sAutoMounter = new AutoMounter();
 }
 static void
 ShutdownAutoMounterIOThread()
 {
   MOZ_ASSERT(MessageLoop::current() == XRE_GetIOMessageLoop());
   sAutoMounter = nullptr;
   ShutdownVolumeManager();
 }
 static void
 SetAutoMounterModeIOThread(const int32_t& aMode)
 {
   MOZ_ASSERT(XRE_GetProcessType() == GeckoProcessType_Default);
   MOZ_ASSERT(MessageLoop::current() == XRE_GetIOMessageLoop());
   MOZ_ASSERT(sAutoMounter);
   sAutoMounter->SetMode(aMode);
 }
 static void
 SetAutoMounterSharingModeIOThread(const nsCString& aVolumeName, const bool& aAllowSharing)
 {
   MOZ_ASSERT(XRE_GetProcessType() == GeckoProcessType_Default);
   MOZ_ASSERT(MessageLoop::current() == XRE_GetIOMessageLoop());
   MOZ_ASSERT(sAutoMounter);
   sAutoMounter->SetSharingMode(aVolumeName, aAllowSharing);
 }
 static void
 AutoMounterFormatVolumeIOThread(const nsCString& aVolumeName)
 {
   MOZ_ASSERT(XRE_GetProcessType() == GeckoProcessType_Default);
   MOZ_ASSERT(MessageLoop::current() == XRE_GetIOMessageLoop());
   MOZ_ASSERT(sAutoMounter);
   sAutoMounter->FormatVolume(aVolumeName);
 }
 static void
 AutoMounterMountVolumeIOThread(const nsCString& aVolumeName)
 {
   MOZ_ASSERT(XRE_GetProcessType() == GeckoProcessType_Default);
   MOZ_ASSERT(MessageLoop::current() == XRE_GetIOMessageLoop());
   MOZ_ASSERT(sAutoMounter);
   sAutoMounter->MountVolume(aVolumeName);
 }
 static void
 AutoMounterUnmountVolumeIOThread(const nsCString& aVolumeName)
 {
   MOZ_ASSERT(XRE_GetProcessType() == GeckoProcessType_Default);
   MOZ_ASSERT(MessageLoop::current() == XRE_GetIOMessageLoop());
   MOZ_ASSERT(sAutoMounter);
   sAutoMounter->UnmountVolume(aVolumeName);
 }
 static void
 UsbCableEventIOThread()
 {
   MOZ_ASSERT(MessageLoop::current() == XRE_GetIOMessageLoop());
   if (!sAutoMounter) {
     return;
   }
   DBG("Calling UpdateState due to USBCableEvent");
   sAutoMounter->UpdateState();
 }
 /**************************************************************************
 *
 *   Public API
 *
 *   Since the AutoMounter runs in IO Thread context, we need to switch
 *   to IOThread context before we can do anything.
 *
 **************************************************************************/
 class UsbCableObserver MOZ_FINAL : public SwitchObserver
 {
   ~UsbCableObserver()
   {
     UnregisterSwitchObserver(SWITCH_USB, this);
   }
 public:
   NS_INLINE_DECL_REFCOUNTING(UsbCableObserver)
   UsbCableObserver()
   {
     RegisterSwitchObserver(SWITCH_USB, this);
   }
   virtual void Notify(const SwitchEvent& aEvent)
   {
     DBG("UsbCable switch device: %d state: %s\n",
         aEvent.device(), SwitchStateStr(aEvent));
     XRE_GetIOMessageLoop()->PostTask(
         FROM_HERE,
         NewRunnableFunction(UsbCableEventIOThread));
   }
 };
 static StaticRefPtr<UsbCableObserver> sUsbCableObserver;
 static StaticRefPtr<AutoMounterSetting> sAutoMounterSetting;
 static void
 InitVolumeConfig()
 {
   // This function uses /system/etc/volume.cfg to add additional volumes
   // to the Volume Manager.
   //
   // This is useful on devices like the Nexus 4, which have no physical sd card
   // or dedicated partition.
   //
   // The format of the volume.cfg file is as follows:
   // create volume-name mount-point
   // Blank lines and lines starting with the hash character "#" will be ignored.
   nsCOMPtr<nsIVolumeService> vs = do_GetService(NS_VOLUMESERVICE_CONTRACTID);
   NS_ENSURE_TRUE_VOID(vs);
   ScopedCloseFile fp;
   int n = 0;
   char line[255];
   char *command, *vol_name_cstr, *mount_point_cstr, *save_ptr;
   const char *filename = "/system/etc/volume.cfg";
   if (!(fp = fopen(filename, "r"))) {
     LOG("Unable to open volume configuration file '%s' - ignoring", filename);
     return;
   }
   while(fgets(line, sizeof(line), fp)) {
     const char *delim = " \t\n";
     n++;
     if (line[0] == '#')
       continue;
     if (!(command = strtok_r(line, delim, &save_ptr))) {
       // Blank line - ignore
       continue;
     }
     if (!strcmp(command, "create")) {
       if (!(vol_name_cstr = strtok_r(nullptr, delim, &save_ptr))) {
         ERR("No vol_name in %s line %d",  filename, n);
         continue;
       }
       if (!(mount_point_cstr = strtok_r(nullptr, delim, &save_ptr))) {
         ERR("No mount point for volume '%s'. %s line %d", vol_name_cstr, filename, n);
         continue;
       }
       nsString  mount_point = NS_ConvertUTF8toUTF16(mount_point_cstr);
       nsString vol_name = NS_ConvertUTF8toUTF16(vol_name_cstr);
       nsresult rv;
       rv = vs->CreateFakeVolume(vol_name, mount_point);
       NS_ENSURE_SUCCESS_VOID(rv);
       rv = vs->SetFakeVolumeState(vol_name, nsIVolume::STATE_MOUNTED);
       NS_ENSURE_SUCCESS_VOID(rv);
     }
     else {
       ERR("Unrecognized command: '%s'", command);
     }
   }
 }
 void
 InitAutoMounter()
 {
   InitVolumeConfig();
   InitVolumeManager();
   sAutoMounterSetting = new AutoMounterSetting();
   XRE_GetIOMessageLoop()->PostTask(
       FROM_HERE,
       NewRunnableFunction(InitAutoMounterIOThread));
   // Switch Observers need to run on the main thread, so we need to
   // start it here and have it send events to the AutoMounter running
   // on the IO Thread.
   sUsbCableObserver = new UsbCableObserver();
 }
 int32_t
 GetAutoMounterStatus()
 {
   if (sAutoMounterSetting) {
     return sAutoMounterSetting->GetStatus();
   }
   return AUTOMOUNTER_STATUS_DISABLED;
 }
 //static
 void
 SetAutoMounterStatus(int32_t aStatus)
 {
   if (sAutoMounterSetting) {
     sAutoMounterSetting->SetStatus(aStatus);
   }
 }
 void
 SetAutoMounterMode(int32_t aMode)
 {
   XRE_GetIOMessageLoop()->PostTask(
       FROM_HERE,
       NewRunnableFunction(SetAutoMounterModeIOThread, aMode));
 }
 void
 SetAutoMounterSharingMode(const nsCString& aVolumeName, bool aAllowSharing)
 {
   XRE_GetIOMessageLoop()->PostTask(
       FROM_HERE,
       NewRunnableFunction(SetAutoMounterSharingModeIOThread,
                           aVolumeName, aAllowSharing));
 }
 void
 AutoMounterFormatVolume(const nsCString& aVolumeName)
 {
   XRE_GetIOMessageLoop()->PostTask(
       FROM_HERE,
       NewRunnableFunction(AutoMounterFormatVolumeIOThread,
                           aVolumeName));
 }
 void
 AutoMounterMountVolume(const nsCString& aVolumeName)
 {
   XRE_GetIOMessageLoop()->PostTask(
       FROM_HERE,
       NewRunnableFunction(AutoMounterMountVolumeIOThread,
                           aVolumeName));
 }
 void
 AutoMounterUnmountVolume(const nsCString& aVolumeName)
 {
   XRE_GetIOMessageLoop()->PostTask(
       FROM_HERE,
       NewRunnableFunction(AutoMounterUnmountVolumeIOThread,
                           aVolumeName));
 }
 void
 ShutdownAutoMounter()
 {
   sAutoMounterSetting = nullptr;
   sUsbCableObserver = nullptr;
   XRE_GetIOMessageLoop()->PostTask(
       FROM_HERE,
       NewRunnableFunction(ShutdownAutoMounterIOThread));
 }
 } // system
 } // mozilla

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dom/system/gonk/AutoMounter.cpp@6474c204b198 (annotated)

dom/system/gonk/AutoMounter.cpp