bonefish+axeld:

* Removed the vm_cache/vm_store ref_count duality that besides being a bit ugly
  also created the page dameon cache retrieval problem: now, only areas (and
  cache consumers) retrieve a reference to the store (and therefore, the vnode).
  The page daemon doesn't need to care about this at all anymore, and the pseudo
  references of the vm_cache could be removed again.
* Rearranged deletion of vnodes such that its ID can be reused directly after
  fs_remove_vnode() has been called.
* vm_page_allocate_page() no longer panics when it runs out of pages, but just
  waits for new pages to become available using the new sFreeCondition condition
  variable - to make sure this happens in an acceptable time frame, it'll
  trigger a run of the low memory handlers.
* Implemented a page_thief() that steals inactive pages from caches and puts
  them into the free queue. It runs as a low memory handler.
* The file cache now sets the usage count on the pages it inserts into the
  cache (needs some rework though, cache_io() doesn't do it yet).
* Instead of panicking, the kernel will currently dead lock in low memory
  situations, since BFS does a bit too much in bfs_release_vnode().
* Some minor cleanup.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22315 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/file_cache.h

@@ -47,7 +47,7 @@ extern void cache_prefetch(dev_t mountID, ino_t vnodeID, off_t offset, size_t si
 extern status_t file_cache_init_post_boot_device(void);
 extern status_t file_cache_init(void);
 
-extern vm_store *vm_create_vnode_store(void *vnode);
+extern vm_store *vm_create_vnode_store(struct vnode *vnode);
 
 #ifdef __cplusplus
 }

headers/private/kernel/vfs.h

@@ -31,6 +31,7 @@ struct vm_cache;
 struct file_descriptor;
 struct selectsync;
 struct pollfd;
+struct vnode;
 
 
 /** The I/O context of a process/team, holds the fd array among others */

headers/private/kernel/vm.h

@@ -15,6 +15,7 @@
 
 struct kernel_args;
 struct team;
+struct vnode;
 
 
 #ifdef __cplusplus
@@ -65,7 +66,7 @@ area_id vm_clone_area(team_id team, const char *name, void **address,
 			uint32 addressSpec, uint32 protection, uint32 mapping, 
 			area_id sourceArea);
 status_t vm_delete_area(team_id aid, area_id id);
-status_t vm_create_vnode_cache(void *vnode, vm_cache **_cache);
+status_t vm_create_vnode_cache(struct vnode *vnode, vm_cache **_cache);
 vm_area *vm_area_lookup(vm_address_space *addressSpace, addr_t address);
 status_t vm_set_area_memory_type(area_id id, addr_t physicalBase, uint32 type);
 status_t vm_get_page_mapping(team_id team, addr_t vaddr, addr_t *paddr);