BTRFS: Implement btrfs_create_dir that can create directories in most case.

We need to handle a case when node is full, the solution should be split or push data to another node.

Signed-off-by: Augustin Cavalier <[email protected]>

src/add-ons/kernel/file_systems/btrfs/Volume.cpp

@@ -388,6 +388,17 @@ Volume::Mount(const char* deviceName, uint32 flags)
 	fChecksumTree->SetRoot(root->LogicalAddress(), NULL);
 	free(root);
 
+	search_key.SetObjectID(-1);
+	search_key.SetType(0);
+	status = fFSTree->FindPrevious(&path, search_key, NULL);
+	if (status != B_OK) {
+		ERROR("Volume::Mount() Couldn't find any inode!!\n");
+		return status;
+	}
+	fLargestInodeID = search_key.ObjectID();
+	TRACE("Volume::Mount() Find larget inode id % " B_PRIu64 "\n",
+		fLargestInodeID);
+
 	// Initialize Journal
 	fJournal = new(std::nothrow) Journal(this);
 	if (fJournal == NULL)

src/add-ons/kernel/file_systems/btrfs/Volume.h

@@ -49,6 +49,7 @@ public:
 			uint32				MaxInlineSize() const
 									{ return fSectorSize / 2; }
 			uint32				BlockSize() const { return fBlockSize; }
+			ino_t				GetNextInodeID() { return ++fLargestInodeID; }
 			Chunk*				SystemChunk() const { return fChunk; }
 			Journal*			GetJournal() const { return fJournal; }
 			ExtentAllocator*	GetAllocator() const { return fExtentAllocator; }
@@ -72,6 +73,7 @@ private:
 			mutex				fLock;
 			fs_volume*			fFSVolume;
 			int					fDevice;
+			ino_t				fLargestInodeID;
 			btrfs_super_block	fSuperBlock;
 			char				fName[32];
 

src/add-ons/kernel/file_systems/btrfs/kernel_interface.cpp

@@ -482,6 +482,52 @@ btrfs_read_link(fs_volume* _volume, fs_vnode* _node, char* buffer,
 //	#pragma mark - Directory functions
 
 
+static status_t
+btrfs_create_dir(fs_volume* _volume, fs_vnode* _directory, const char* name,
+	int mode)
+{
+	Volume* volume = (Volume*)_volume->private_volume;
+	Inode* directory = (Inode*)_directory->private_node;
+	BTree::Path path(volume->FSTree());
+
+	if (volume->IsReadOnly())
+		return B_READ_ONLY_DEVICE;
+
+	if (!directory->IsDirectory())
+		return B_NOT_A_DIRECTORY;
+
+	status_t status = directory->CheckPermissions(W_OK);
+	if (status < B_OK)
+		return status;
+
+	Transaction transaction(volume);
+	ino_t id = volume->GetNextInodeID();
+	mode = S_DIRECTORY | (mode & S_IUMSK);
+	Inode* inode = Inode::Create(transaction, id, directory, mode);
+	if (inode == NULL)
+		return B_NO_MEMORY;
+
+	status = inode->Insert(transaction, &path);
+	if (status != B_OK)
+		return status;
+
+	status = inode->MakeReference(transaction, &path, directory, name, mode);
+	if (status != B_OK)
+		return status;
+
+	put_vnode(volume->FSVolume(), inode->ID());
+	entry_cache_add(volume->ID(), directory->ID(), name, inode->ID());
+
+	status = transaction.Done();
+	if (status == B_OK)
+		notify_entry_created(volume->ID(), directory->ID(), name, inode->ID());
+	else
+		entry_cache_remove(volume->ID(), directory->ID(), name);
+
+	return status;
+}
+
+
 static status_t
 btrfs_open_dir(fs_volume* /*_volume*/, fs_vnode* _node, void** _cookie)
 {
@@ -814,7 +860,7 @@ fs_vnode_ops gBtrfsVnodeOps = {
 	NULL,	//	fs_write,
 
 	/* directory operations */
-	NULL, 	// fs_create_dir,
+	&btrfs_create_dir,
 	NULL, 	// fs_remove_dir,
 	&btrfs_open_dir,
 	&btrfs_close_dir,