* Made the use of file devices more convenient and complete by adding

the methods IsFile() and GetFilePath() to BDiskDevice, and
  BDiskDeviceRoster::GetFileDeviceForPath().
* Added new syscalls to implement this functionality.
* Added new flag B_DISK_DEVICE_IS_FILE.
* Fixed wrong operator precedence assumption in the BDiskDevice class at
  several places.
* Minor cleanup.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@28052 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/storage/DiskDeviceDefs.h

@@ -62,6 +62,7 @@ enum {
 	B_DISK_DEVICE_HAS_MEDIA		= 0x02,
 	B_DISK_DEVICE_READ_ONLY		= 0x04,
 	B_DISK_DEVICE_WRITE_ONCE	= 0x08,
+	B_DISK_DEVICE_IS_FILE		= 0x10,
 };
 
 // disk system flags

headers/private/kernel/disk_device_manager/ddm_userland_interface.h

@@ -26,21 +26,25 @@ extern "C" {
 partition_id _user_get_next_disk_device_id(int32 *cookie, size_t *neededSize);
 partition_id _user_find_disk_device(const char *filename, size_t *neededSize);
 partition_id _user_find_partition(const char *filename, size_t *neededSize);
+partition_id _user_find_file_disk_device(const char *filename,
+				size_t *neededSize);
 status_t _user_get_disk_device_data(partition_id deviceID, bool deviceOnly,
 				user_disk_device_data *buffer, size_t bufferSize,
 				size_t *neededSize);
 
 partition_id _user_register_file_device(const char *filename);
 status_t _user_unregister_file_device(partition_id deviceID,
-									  const char *filename);
+				const char *filename);
 	// Only a valid deviceID or filename need to be passed. The other one
 	// is -1/NULL. If both is given only filename is ignored.
+status_t _user_get_file_disk_device_path(partition_id id, char* buffer,
+				size_t bufferSize);
 
 // disk systems
 status_t _user_get_disk_system_info(disk_system_id id,
-									user_disk_system_info *info);
+				user_disk_system_info *info);
 status_t _user_get_next_disk_system_info(int32 *cookie,
-										 user_disk_system_info *info);
+				user_disk_system_info *info);
 status_t _user_find_disk_system(const char *name, user_disk_system_info *info);
 
 // disk device modification

headers/private/storage/DiskDevice.h

@@ -37,6 +37,9 @@ public:
 									bool receiveCompleteProgressUpdates = true);
 			status_t			CancelModifications();
 
+			bool				IsFile() const;
+			status_t			GetFilePath(BPath* path) const;
+
 private:
 			friend class BDiskDeviceList;
 			friend class BDiskDeviceRoster;

headers/private/storage/DiskDeviceRoster.h

@@ -28,7 +28,7 @@ enum {
 	// Basic masks
 	B_DEVICE_REQUEST_MOUNT_POINT			= 0x0001,	// mount point changes
 	B_DEVICE_REQUEST_MOUNTING				= 0x0002,	// mounting/unmounting
-	B_DEVICE_REQUEST_PARTITION				= 0x0004,	// partition changes 
+	B_DEVICE_REQUEST_PARTITION				= 0x0004,	// partition changes
 	B_DEVICE_REQUEST_DEVICE					= 0x0008,	// device changes (media changes)
 	B_DEVICE_REQUEST_DEVICE_LIST			= 0x0010,	// device additions/removals
 	B_DEVICE_REQUEST_JOB_LIST				= 0x0020, 	// job addition/initiation/cancellation/completion
@@ -125,6 +125,8 @@ public:
 								BDiskDevice* device);
 			status_t		GetPartitionForPath(const char* filename,
 								BDiskDevice* device, BPartition** _partition);
+			status_t		GetFileDeviceForPath(const char* filename,
+								BDiskDevice* device);
 
 			status_t		StartWatching(BMessenger target,
 								uint32 eventMask = B_DEVICE_REQUEST_ALL);

headers/private/system/syscalls.h

@@ -441,9 +441,14 @@ extern status_t		_kern_get_cpuid(cpuid_info *info, uint32 eax, uint32 cpu);
 /* Disk Device Manager syscalls */
 
 // iterating, retrieving device/partition data
-extern partition_id	_kern_get_next_disk_device_id(int32 *cookie, size_t *neededSize);
-extern partition_id	_kern_find_disk_device(const char *filename, size_t *neededSize);
-extern partition_id	_kern_find_partition(const char *filename, size_t *neededSize);
+extern partition_id	_kern_get_next_disk_device_id(int32 *cookie,
+						size_t *neededSize);
+extern partition_id	_kern_find_disk_device(const char *filename,
+						size_t *neededSize);
+extern partition_id	_kern_find_partition(const char *filename,
+						size_t *neededSize);
+extern partition_id	_kern_find_file_disk_device(const char *filename,
+						size_t *neededSize);
 extern status_t		_kern_get_disk_device_data(partition_id deviceID,
 						bool deviceOnly, struct user_disk_device_data *buffer,
 						size_t bufferSize, size_t *neededSize);
@@ -452,6 +457,8 @@ extern status_t		_kern_unregister_file_device(partition_id deviceID,
 						const char *filename);
 	// Only a valid deviceID or filename need to be passed. The other one
 	// is -1/NULL. If both is given only filename is ignored.
+extern status_t		_kern_get_file_disk_device_path(partition_id id,
+						char* buffer, size_t bufferSize);
 
 // disk systems
 extern status_t		_kern_get_disk_system_info(disk_system_id id,