kernel/fs: Don't store the mount cookie in the KPartition.

Nothing uses it. If needed, it can be retrieved through the volume
(mount) ID.

headers/os/drivers/disk_device_manager.h

@@ -31,7 +31,6 @@ typedef struct partition_data {
 	uint32			status;
 	uint32			flags;
 	dev_t			volume;			// [sys]
-	void			*mount_cookie;	// [sys]
 	char			*name;			// max: B_OS_NAME_LENGTH
 	char			*content_name;	//
 	char			*type;			//

headers/private/kernel/disk_device_manager/KPartition.h

@@ -125,9 +125,6 @@ public:
 	void SetVolumeID(dev_t volumeID);
 	dev_t VolumeID() const;
 
-	void SetMountCookie(void *cookie);
-	void *MountCookie() const;
-
 	// Parameters
 
 	status_t SetParameters(const char *parameters);
@@ -207,7 +204,6 @@ protected:
 	void FireTypeChanged(const char *type);
 	void FireIDChanged(partition_id id);
 	void FireVolumeIDChanged(dev_t volumeID);
-	void FireMountCookieChanged(void *cookie);
 	void FireParametersChanged(const char *parameters);
 	void FireContentParametersChanged(const char *parameters);
 	void FireChildAdded(KPartition *child, int32 index);

headers/private/kernel/disk_device_manager/KPartitionListener.h

@@ -28,7 +28,6 @@ public:
 	virtual void TypeChanged(KPartition *partition, const char *type);
 	virtual void IDChanged(KPartition *partition, partition_id id);
 	virtual void VolumeIDChanged(KPartition *partition, dev_t volumeID);
-	virtual void MountCookieChanged(KPartition *partition, void *cookie);
 	virtual void ParametersChanged(KPartition *partition,
 								   const char *parameters);
 	virtual void ContentParametersChanged(KPartition *partition,

src/system/kernel/disk_device_manager/KPartition.cpp

@@ -80,7 +80,6 @@ KPartition::KPartition(partition_id id)
 	fPartitionData.status = B_PARTITION_UNRECOGNIZED;
 	fPartitionData.flags = B_PARTITION_BUSY;
 	fPartitionData.volume = -1;
-	fPartitionData.mount_cookie = NULL;
 	fPartitionData.name = NULL;
 	fPartitionData.content_name = NULL;
 	fPartitionData.type = NULL;
@@ -811,23 +810,6 @@ KPartition::VolumeID() const
 }
 
 
-void
-KPartition::SetMountCookie(void* cookie)
-{
-	if (fPartitionData.mount_cookie != cookie) {
-		fPartitionData.mount_cookie = cookie;
-		FireMountCookieChanged(cookie);
-	}
-}
-
-
-void*
-KPartition::MountCookie() const
-{
-	return fPartitionData.mount_cookie;
-}
-
-
 status_t
 KPartition::SetParameters(const char* parameters)
 {
@@ -1537,18 +1519,6 @@ KPartition::FireVolumeIDChanged(dev_t volumeID)
 }
 
 
-void
-KPartition::FireMountCookieChanged(void* cookie)
-{
-	if (fListeners) {
-		for (ListenerSet::Iterator it = fListeners->Begin();
-			 it != fListeners->End(); ++it) {
-			(*it)->MountCookieChanged(this, cookie);
-		}
-	}
-}
-
-
 void
 KPartition::FireParametersChanged(const char* parameters)
 {

src/system/kernel/disk_device_manager/KPartitionListener.cpp

@@ -86,12 +86,6 @@ KPartitionListener::VolumeIDChanged(KPartition *partition, dev_t volumeID)
 {
 }
 
-// MountCookieChanged
-void
-KPartitionListener::MountCookieChanged(KPartition *partition, void *cookie)
-{
-}
-
 // ParametersChanged
 void
 KPartitionListener::ParametersChanged(KPartition *partition,

src/system/kernel/fs/vfs.cpp

@@ -7672,9 +7672,8 @@ fs_mount(char* path, const char* device, const char* fsName, uint32 flags,
 		inc_vnode_ref_count(sRoot);
 	}
 
-	// supply the partition (if any) with the mount cookie and mark it mounted
+	// supply the partition (if any) with the mount ID and mark it mounted
 	if (partition) {
-		partition->SetMountCookie(mount->volume->private_volume);
 		partition->SetVolumeID(mount->id);
 
 		// keep a partition reference as long as the partition is mounted
@@ -7917,7 +7916,6 @@ fs_unmount(char* path, dev_t mountID, uint32 flags, bool kernel)
 	// dereference the partition and mark it unmounted
 	if (partition) {
 		partition->SetVolumeID(-1);
-		partition->SetMountCookie(NULL);
 
 		if (mount->owns_file_device)
 			KDiskDeviceManager::Default()->DeleteFileDevice(partition->ID());