* Introduced IOScheduler::MediaChanged() - this is now called by scsi_cd instead

of having the logic be triggered by IOScheduler::SetDeviceCapacity(), as that
  one might actually be called more often (for each call to update_capacity(),
  ie. each B_GET_GEOMETRY/B_GET_DEVICE_SIZE will trigger it), and there is no
  reason to throw away the cache every time (will make a difference during
  partition/file system detection).
* In cd_init_device() just call update_capacity() instead of duplicating its
  code.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@36986 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/kernel/drivers/disk/scsi/scsi_cd/scsi_cd.cpp

@@ -1,10 +1,11 @@
 /*
- * Copyright 2004-2009, Haiku, Inc. All rights reserved.
+ * Copyright 2004-2010, Haiku, Inc. All rights reserved.
  * Copyright 2002-2003, Thomas Kurschel. All rights reserved.
  *
  * Distributed under the terms of the MIT License.
  */
 
+
 /*!	Peripheral driver to handle CD-ROM drives. To be more
 	precisely, it supports CD-ROM and WORM drives (well -
 	I've never _seen_ a WORM driver).
@@ -586,12 +587,9 @@ cd_init_device(void* _info, void** _cookie)
 	cd_driver_info* info = (cd_driver_info*)_info;
 
 	// and get (initial) capacity
-	scsi_ccb *request = info->scsi->alloc_ccb(info->scsi_device);
-	if (request == NULL)
-		return B_NO_MEMORY;
-
-	sSCSIPeripheral->check_capacity(info->scsi_periph_device, request);
-	info->scsi->free_ccb(request);
+	status_t status = update_capacity(info);
+	if (status != B_OK)
+		return status;
 
 	*_cookie = info;
 	return B_OK;
@@ -929,6 +927,9 @@ cd_media_changed(cd_driver_info* info, scsi_ccb* request)
 	// do a capacity check
 	// TBD: is this a good idea (e.g. if this is an empty CD)?
 	sSCSIPeripheral->check_capacity(info->scsi_periph_device, request);
+
+	if (info->io_scheduler != NULL)
+		info->io_scheduler->MediaChanged();
 }
 
 

src/system/kernel/device_manager/IOCache.cpp

@@ -133,6 +133,16 @@ IOCache::SetDeviceCapacity(off_t deviceCapacity)
 	AutoLocker<VMCache> cacheLocker(fCache);
 
 	fDeviceCapacity = deviceCapacity;
+}
+
+
+void
+IOCache::MediaChanged()
+{
+	TRACE("%p->IOCache::MediaChanged()\n", this);
+
+	MutexLocker serializationLocker(fSerializationLock);
+	AutoLocker<VMCache> cacheLocker(fCache);
 
 	// new media -- burn all cached data
 	while (vm_page* page = fCache->pages.Root()) {

src/system/kernel/device_manager/IOCache.h

@@ -26,6 +26,7 @@ public:
 	virtual	status_t			Init(const char* name);
 
 	virtual	void				SetDeviceCapacity(off_t deviceCapacity);
+	virtual void				MediaChanged();
 
 	virtual	status_t			ScheduleRequest(IORequest* request);
 

src/system/kernel/device_manager/IOScheduler.cpp

@@ -66,3 +66,9 @@ void
 IOScheduler::SetDeviceCapacity(off_t deviceCapacity)
 {
 }
+
+
+void
+IOScheduler::MediaChanged()
+{
+}

src/system/kernel/device_manager/IOScheduler.h

@@ -46,6 +46,7 @@ public:
 	virtual	void				SetCallback(io_callback callback, void* data);
 
 	virtual	void				SetDeviceCapacity(off_t deviceCapacity);
+	virtual void				MediaChanged();
 
 	virtual	status_t			ScheduleRequest(IORequest* request) = 0;