kernel/vm: Preparations for VMCache::committed_size removal.

Includes some cleanup to the organization of VMCache.h.

headers/private/kernel/vm/VMCache.h

@@ -99,6 +99,13 @@ public:
 	inline	void				ReleaseRef();
 	inline	void				ReleaseRefAndUnlock(
 									bool consumerLocked = false);
+			int32				RefCount() const
+									{ return fRefCount; }
+
+			void*				UserData()	{ return fUserData; }
+			void				SetUserData(void* data)	{ fUserData = data; }
+									// Settable by the lock owner and valid as
+									// long as the lock is owned.
 
 	inline	VMCacheRef*			CacheRef() const	{ return fCacheRef; }
 
@@ -129,9 +136,6 @@ public:
 			void				TakeAreasFrom(VMCache* fromCache);
 			uint32				CountWritableAreas(VMArea* ignoreArea) const;
 
-			status_t			WriteModified();
-			status_t			SetMinimalCommitment(off_t commitment,
-									int priority);
 	virtual	status_t			Resize(off_t newSize, int priority);
 	virtual	status_t			Rebase(off_t newBase, int priority);
 	virtual	status_t			Adopt(VMCache* source, off_t offset, off_t size,
@@ -141,20 +145,14 @@ public:
 
 			status_t			FlushAndRemoveAllPages();
 
-			void*				UserData()	{ return fUserData; }
-			void				SetUserData(void* data)	{ fUserData = data; }
-									// Settable by the lock owner and valid as
-									// long as the lock is owned.
-
-			// for debugging only
-			int32				RefCount() const
-									{ return fRefCount; }
-
-	// backing store operations
+			status_t			SetMinimalCommitment(off_t commitment,
+									int priority);
+			off_t				Commitment() const;
 	virtual	bool				CanOvercommit();
 	virtual	status_t			Commit(off_t size, int priority);
-	virtual	bool				StoreHasPage(off_t offset);
 
+	// backing store operations
+	virtual	bool				StoreHasPage(off_t offset);
 	virtual	status_t			Read(off_t offset, const generic_io_vec *vecs,
 									size_t count, uint32 flags,
 									generic_size_t *_numBytes);
@@ -166,6 +164,7 @@ public:
 									generic_size_t numBytes, uint32 flags,
 									AsyncIOCallback* callback);
 	virtual	bool				CanWritePage(off_t offset);
+			status_t			WriteModified();
 
 	virtual	int32				MaxPagesPerWrite() const
 									{ return -1; } // no restriction

src/add-ons/kernel/file_systems/ramfs/DataContainer.cpp

@@ -256,7 +256,7 @@ off_t
 DataContainer::GetCommittedSize() const
 {
 	if (_IsCacheMode())
-		return sizeof(VMForVnodeCache) + fCache->committed_size;
+		return sizeof(VMForVnodeCache) + fCache->Commitment();
 	else
 		return fSmallBufferSize;
 }

src/system/kernel/vm/VMCache.cpp

@@ -148,7 +148,7 @@ class SetMinimalCommitment : public VMCacheTraceEntry {
 		SetMinimalCommitment(VMCache* cache, off_t commitment)
 			:
 			VMCacheTraceEntry(cache),
-			fOldCommitment(cache->committed_size),
+			fOldCommitment(cache->Commitment()),
 			fCommitment(commitment)
 		{
 			Initialized();
@@ -1080,7 +1080,7 @@ VMCache::SetMinimalCommitment(off_t commitment, int priority)
 
 	// If we don't have enough committed space to cover through to the new end
 	// of the area...
-	if (committed_size < commitment) {
+	if (Commitment() < commitment) {
 #if KDEBUG
 		const off_t size = PAGE_ALIGN(virtual_end - virtual_base);
 		ASSERT_PRINT(commitment <= size, "cache %p, commitment %" B_PRIdOFF ", size %" B_PRIdOFF,
@@ -1307,6 +1307,13 @@ VMCache::FlushAndRemoveAllPages()
 }
 
 
+off_t
+VMCache::Commitment() const
+{
+	return committed_size;
+}
+
+
 bool
 VMCache::CanOvercommit()
 {

src/system/kernel/vm/vm.cpp

@@ -1175,7 +1175,7 @@ discard_area_range(VMArea* area, addr_t address, addr_t size)
 	cache->Discard(area->cache_offset + offset, size);
 
 	if (commitmentChange != 0)
-		cache->Commit(cache->committed_size + commitmentChange, VM_PRIORITY_USER);
+		cache->Commit(cache->Commitment() + commitmentChange, VM_PRIORITY_USER);
 
 	cache->ReleaseRefAndUnlock();
 	return B_OK;
@@ -6567,7 +6567,7 @@ _user_set_memory_protection(void* _address, size_t size, uint32 protection)
 			}
 
 			if (commitmentChange != 0) {
-				off_t newCommitment = topCache->committed_size + commitmentChange;
+				off_t newCommitment = topCache->Commitment() + commitmentChange;
 				const ssize_t topCacheSize = topCache->virtual_end - topCache->virtual_base;
 				if (newCommitment > topCacheSize) {
 					// This should only happen in the case where this process fork()ed,

src/system/kernel/vm/vm_debug.cpp

@@ -278,7 +278,7 @@ update_cache_info_recursively(VMCache* cache, cache_info& info)
 {
 	info.page_count += cache->page_count;
 	if (cache->type == CACHE_TYPE_RAM)
-		info.committed += cache->committed_size;
+		info.committed += cache->Commitment();
 
 	// recurse
 	for (VMCache::ConsumerList::Iterator it = cache->consumers.GetIterator();
@@ -324,7 +324,7 @@ dump_caches_recursively(VMCache* cache, cache_info& info, int level)
 		kprintf("/%lu", info.page_count);
 
 	if (cache->type == CACHE_TYPE_RAM || (level == 0 && info.committed > 0)) {
-		kprintf(", committed: %" B_PRIdOFF, cache->committed_size);
+		kprintf(", committed: %" B_PRIdOFF, cache->Commitment());
 
 		if (level == 0)
 			kprintf("/%lu", info.committed);