Added new but empty function file_cache_invalidate_file_map().

This is needed in case the on-disk representation of a file changes (due to reorganization/defragmentation).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@13660 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/drivers/fs_cache.h

@@ -1,6 +1,6 @@
 /* File System File and Block Caches
  *
- * Copyright 2004, Haiku Inc. All Rights Reserved.
+ * Copyright 2004-2005, Haiku Inc. All Rights Reserved.
  * Distributed under the terms of the MIT License.
  */
 #ifndef _FS_CACHE_H
@@ -47,6 +47,7 @@ extern void *file_cache_create(mount_id mountID, vnode_id vnodeID, off_t size, i
 extern void file_cache_delete(void *_cacheRef);
 extern status_t file_cache_set_size(void *_cacheRef, off_t size);
 extern status_t file_cache_sync(void *_cache);
+extern status_t file_cache_invalidate_file_map(void *_cacheRef, off_t offset, off_t size);
 
 extern status_t file_cache_read_pages(void *_cacheRef, off_t offset,
 					const iovec *vecs, size_t count, size_t *_numBytes);

src/system/kernel/cache/file_cache.cpp

@@ -868,3 +868,9 @@ file_cache_write(void *_cacheRef, off_t offset, const void *buffer, size_t *_siz
 }
 
 
+extern "C" status_t
+file_cache_invalidate_file_map(void *_cacheRef, off_t offset, off_t size)
+{
+	// ToDo: implement me as soon as file maps (extents) are cached
+	return B_OK;
+}