axeld + bonefish:

* Unmount when uninitializing a partition.
* Finished the media checker implementation, i.e. we rescan when a media
  was inserted and uninitialize when ejected.
* Turned the disk device media checker from a kernel daemon into a thread.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22909 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/disk_device_manager/KDiskDeviceManager.h

@@ -99,8 +99,8 @@ public:
 	status_t RescanDiskSystems();
 
 private:
-	static void _CheckMediaStatusDaemon(void* self, int iteration);
-	void _CheckMediaStatus();
+	static status_t _CheckMediaStatusDaemon(void* self);
+	status_t _CheckMediaStatus();
 
 	status_t _RescanDiskSystems(bool fileSystems);
 
@@ -127,6 +127,8 @@ private:
 	PartitionMap				*fPartitions;
 	DiskSystemMap				*fDiskSystems;
 	PartitionSet				*fObsoletePartitions;
+	thread_id					fMediaChecker;
+	volatile bool				fTerminating;
 
 	static KDiskDeviceManager	*sDefaultManager;
 };

headers/private/kernel/disk_device_manager/KPartition.h

@@ -54,6 +54,7 @@ public:
 	bool IsBusy() const;
 	bool IsBusy(bool includeDescendants);
 	bool CheckAndMarkBusy(bool includeDescendants);
+	void MarkBusy(bool includeDescendants);
 	void UnmarkBusy(bool includeDescendants);
 
 	void SetOffset(off_t offset);

src/system/kernel/disk_device_manager/KDiskDeviceManager.cpp

@@ -103,15 +103,19 @@ KDiskDeviceManager::KDiskDeviceManager()
 	  fDevices(new(nothrow) DeviceMap),
 	  fPartitions(new(nothrow) PartitionMap),
 	  fDiskSystems(new(nothrow) DiskSystemMap),
-	  fObsoletePartitions(new(nothrow) PartitionSet)
+	  fObsoletePartitions(new(nothrow) PartitionSet),
+	  fMediaChecker(-1),
+	  fTerminating(false)
 {
 	if (InitCheck() != B_OK)
 		return;
 
 	RescanDiskSystems();
 
-	register_kernel_daemon(&_CheckMediaStatusDaemon, this, 10);
-		// once every second
+	fMediaChecker = spawn_kernel_thread(_CheckMediaStatusDaemon,
+		"media checker", B_NORMAL_PRIORITY, this);
+	if (fMediaChecker >= 0)
+		resume_thread(fMediaChecker);
 
 	DBG(OUT("number of disk systems: %ld\n", CountDiskSystems()));
 	// TODO: Watch the disk systems and the relevant directories.
@@ -120,9 +124,11 @@ KDiskDeviceManager::KDiskDeviceManager()
 
 KDiskDeviceManager::~KDiskDeviceManager()
 {
-	unregister_kernel_daemon(&_CheckMediaStatusDaemon, this);
+	fTerminating = true;
+
+	status_t result;
+	wait_for_thread(fMediaChecker, &result);
 
-	// TODO: terminate and remove all jobs
 	// remove all devices
 	for (int32 cookie = 0; KDiskDevice *device = NextDevice(&cookie);) {
 		PartitionRegistrar _(device);
@@ -1127,35 +1133,45 @@ KDiskDeviceManager::_ScanPartition(KPartition *partition)
 }
 
 
-void
+status_t
 KDiskDeviceManager::_CheckMediaStatus()
 {
-	if (fLock.LockWithTimeout(0) != B_OK)
-		return;
-
-	int32 cookie = 0;
 	while (true) {
-		KDiskDevice* device = NextDevice(&cookie);
-		if (device == NULL)
-			break;
+		int32 cookie = 0;
+		while (KDiskDevice* device = RegisterNextDevice(&cookie)) {
+			DeviceWriteLocker locker(device);
 
-		bool hadMedia = device->HasMedia();
-		device->UpdateMediaStatusIfNeeded();
+			if (device->IsBusy(true))
+				continue;
 
-		// TODO: propagate changes!
-		if (device->MediaChanged()) {
+			bool hadMedia = device->HasMedia();
+			device->UpdateMediaStatusIfNeeded();
+
+			if (!device->MediaChanged() && (device->HasMedia() || !hadMedia))
+				continue;
+
+			device->MarkBusy(true);
+			device->UninitializeContents(true);
+
+			if (device->MediaChanged()) {
 				dprintf("Media changed from %s\n", device->Path());
-		} else if (!device->HasMedia() && hadMedia) {
-			dprintf("Media removed from %s\n", device->Path());
+				_ScanPartition(device, false);
+			} else if (!device->HasMedia() && hadMedia) {
+				dprintf("Media removed from %s\n", device->Path());
+			}
+
+			device->UnmarkBusy(true);
 		}
+
+		snooze(1000000);
 	}
 
-	fLock.Unlock();
+	return 0;
 }
 
 
-void
-KDiskDeviceManager::_CheckMediaStatusDaemon(void* self, int iteration)
+status_t
+KDiskDeviceManager::_CheckMediaStatusDaemon(void* self)
 {
-	((KDiskDeviceManager*)self)->_CheckMediaStatus();
+	return ((KDiskDeviceManager*)self)->_CheckMediaStatus();
 }

src/system/kernel/disk_device_manager/KFileDiskDevice.cpp

@@ -13,7 +13,6 @@
 #include <KFileDiskDevice.h>
 #include <KPath.h>
 
-#include "virtualdrive.h"
 
 // debugging
 //#define DBG(x)
@@ -166,7 +165,6 @@ KFileDiskDevice::GetGeometry(device_geometry *geometry)
 	geometry->write_once = false;
 
 	return B_OK;
-
 }
 
 // _RegisterDevice
@@ -175,48 +173,6 @@ KFileDiskDevice::_RegisterDevice(const char *file, const char *device)
 {
 	return devfs_publish_file_device(device + 5, file);
 		// we need to remove the "/dev/" part from the path
-
-	// TODO: For now we use the virtualdrive driver to register a file
-	// as a device and then simply symlink the assigned device to the
-	// desired device location. Replace that with the
-	// respective kernel magic for the OBOS kernel!
-	// -> Well, we could simply symlink the file there. Doesn't work for R5,
-	// but we should be able to deal with it properly.
-//
-//	// open the virtualdrive control device
-//	int fd = open(VIRTUAL_DRIVE_CONTROL_DEVICE, O_RDONLY);
-//	if (fd < 0) {
-//		DBG(OUT("Failed to open virtualdrive control device: %s\n",
-//				strerror(errno)));
-//		return errno;
-//	}
-//	// set up the info
-//	virtual_drive_info info;
-//	strcpy(info.file_name, file);
-//	info.use_geometry = false;
-//	status_t error = B_OK;
-//	if (ioctl(fd, VIRTUAL_DRIVE_REGISTER_FILE, &info) != 0) {
-//		error = errno;
-//		DBG(OUT("Failed to install file device: %s\n", strerror(error)));
-//	}
-//	// close the control device
-//	close(fd);
-//	// create a symlink
-//	if (error == B_OK) {
-//		if (symlink(info.device_name, device) != 0) {
-//			DBG(OUT("Failed to create file device symlink: %s\n",
-//					strerror(error)));
-//			error = errno;
-//			// unregister the file device
-//			// open the device
-//			int deviceFD = open(info.device_name, O_RDONLY);
-//			if (deviceFD >= 0) {
-//				ioctl(deviceFD, VIRTUAL_DRIVE_UNREGISTER_FILE);
-//				close(deviceFD);
-//			}
-//		}
-//	}
-//	return error;
 }
 
 // _UnregisterDevice
@@ -225,29 +181,6 @@ KFileDiskDevice::_UnregisterDevice(const char *_device)
 {
 	return devfs_unpublish_file_device(_device + 5);
 		// we need to remove the "/dev/" part from the path
-
-//	// read the symlink to get the path of the virtualdrive device
-//	char device[B_PATH_NAME_LENGTH];
-//	ssize_t bytesRead = readlink(_device, device, sizeof(device) - 1);
-//	if (bytesRead < 0)
-//		return errno;
-//	device[bytesRead] = '\0';
-//	// open the device
-//	int fd = open(device, O_RDONLY);
-//	if (fd < 0)
-//		return errno;
-//	// issue the ioctl
-//	status_t error = B_OK;
-//	if (ioctl(fd, VIRTUAL_DRIVE_UNREGISTER_FILE) != 0)
-//		error = errno;
-//	// close the control device
-//	close(fd);
-//	// remove the symlink
-//	if (error == B_OK) {
-//		if (remove(_device) < 0)
-//			error = errno;
-//	}
-//	return error;
 }
 
 // _GetDirectoryPath

src/system/kernel/disk_device_manager/KPartition.cpp

@@ -9,6 +9,7 @@
 #include <KernelExport.h>
 #include <Drivers.h>
 #include <Errors.h>
+#include <fs_volume.h>
 #include <util/kernel_cpp.h>
 
 #include <ddm_userland_interface.h>
@@ -22,6 +23,7 @@
 #include <KPartitionVisitor.h>
 #include <KPath.h>
 #include <VectorSet.h>
+#include <vfs.h>
 
 #include "UserDataWriter.h"
 
@@ -272,6 +274,16 @@ KPartition::CheckAndMarkBusy(bool includeDescendants)
 	if (IsBusy(includeDescendants))
 		return false;
 
+	MarkBusy(includeDescendants);
+
+	return true;
+}
+
+
+// MarkBusy
+void
+KPartition::MarkBusy(bool includeDescendants)
+{
 	if (includeDescendants) {
 		struct MarkBusyVisitor : KPartitionVisitor {
 			virtual bool VisitPre(KPartition* partition)
@@ -284,8 +296,6 @@ KPartition::CheckAndMarkBusy(bool includeDescendants)
 		VisitEachDescendant(&markVisitor);
 	} else
 		SetBusy(true);
-
-	return true;
 }
 
 
@@ -1039,7 +1049,13 @@ KPartition::UninitializeContents(bool logChanges)
 
 		// volume
 		if (VolumeID() >= 0) {
-// TODO: Unmount?
+			status_t error = vfs_unmount(VolumeID(),
+				B_FORCE_UNMOUNT | B_UNMOUNT_BUSY_PARTITION);
+			if (error != B_OK) {
+				dprintf("KPartition::UninitializeContents(): Failed to unmount "
+					"device %ld: %s\n", VolumeID(), strerror(error));
+			}
+
 			SetVolumeID(-1);
 			flags |= B_PARTITION_CHANGED_VOLUME;
 		}

src/system/kernel/disk_device_manager/ddm_userland_interface.cpp

@@ -1225,7 +1225,7 @@ _user_uninitialize_partition(partition_id partitionID, int32* _changeCounter)
 		return B_BAD_VALUE;
 
 	// check busy
-	if (partition->IsBusy(true))
+	if (!partition->CheckAndMarkBusy(true))
 		return B_BUSY;
 
 // TODO: We should also check, if any partition is mounted!