예제 #1
0
static status_t
ext2_lookup(fs_volume* _volume, fs_vnode* _directory, const char* name,
	ino_t* _vnodeID)
{
	TRACE("ext2_lookup: name address: %p\n", name);
	TRACE("ext2_lookup: name: %s\n", name);
	Volume* volume = (Volume*)_volume->private_volume;
	Inode* directory = (Inode*)_directory->private_node;

	// check access permissions
	status_t status = directory->CheckPermissions(X_OK);
	if (status < B_OK)
		return status;

	HTree htree(volume, directory);
	DirectoryIterator* iterator;

	status = htree.Lookup(name, &iterator);
	if (status != B_OK)
		return status;

	ObjectDeleter<DirectoryIterator> iteratorDeleter(iterator);

	status = iterator->FindEntry(name, _vnodeID);
	if (status != B_OK)
		return status;

	return get_vnode(volume->FSVolume(), *_vnodeID, NULL);
}
예제 #2
0
static status_t
ext2_unlink(fs_volume* _volume, fs_vnode* _directory, const char* name)
{
	TRACE("ext2_unlink()\n");
	if (strcmp(name, ".") == 0 || strcmp(name, "..") == 0)
		return B_NOT_ALLOWED;

	Volume* volume = (Volume*)_volume->private_volume;
	Inode* directory = (Inode*)_directory->private_node;

	status_t status = directory->CheckPermissions(W_OK);
	if (status != B_OK)
		return status;

	TRACE("ext2_unlink(): Starting transaction\n");
	Transaction transaction(volume->GetJournal());

	directory->WriteLockInTransaction(transaction);

	TRACE("ext2_unlink(): Looking up for directory entry\n");
	HTree htree(volume, directory);
	DirectoryIterator* directoryIterator;

	status = htree.Lookup(name, &directoryIterator);
	if (status != B_OK)
		return status;

	ino_t id;
	status = directoryIterator->FindEntry(name, &id);
	if (status != B_OK)
		return status;

	Vnode vnode(volume, id);
	Inode* inode;
	status = vnode.Get(&inode);
	if (status != B_OK)
		return status;

	inode->WriteLockInTransaction(transaction);

	status = inode->Unlink(transaction);
	if (status != B_OK)
		return status;

	status = directoryIterator->RemoveEntry(transaction);
	if (status != B_OK)
		return status;

	entry_cache_remove(volume->ID(), directory->ID(), name);

	status = transaction.Done();
	if (status != B_OK)
		entry_cache_add(volume->ID(), directory->ID(), name, id);
	else
		notify_entry_removed(volume->ID(), directory->ID(), name, id);

	return status;
}
예제 #3
0
파일: Inode.cpp 프로젝트: jiangxilong/haiku
/*static*/ status_t
Inode::Create(Transaction& transaction, Inode* parent, const char* name,
	int32 mode, int openMode, uint8 type, bool* _created, ino_t* _id,
	Inode** _inode, fs_vnode_ops* vnodeOps, uint32 publishFlags)
{
	TRACE("Inode::Create()\n");
	Volume* volume = transaction.GetVolume();

	DirectoryIterator* entries = NULL;
	ObjectDeleter<DirectoryIterator> entriesDeleter;

	if (parent != NULL) {
		parent->WriteLockInTransaction(transaction);

		TRACE("Inode::Create(): Looking up entry destination\n");
		HTree htree(volume, parent);

		status_t status = htree.Lookup(name, &entries);
		if (status == B_ENTRY_NOT_FOUND) {
			panic("We need to add the first node.\n");
			return B_ERROR;
		}
		if (status != B_OK)
			return status;
		entriesDeleter.SetTo(entries);

		TRACE("Inode::Create(): Looking up to see if file already exists\n");
		ino_t entryID;

		status = entries->FindEntry(name, &entryID);
		if (status == B_OK) {
			// File already exists
			TRACE("Inode::Create(): File already exists\n");
			if (S_ISDIR(mode) || S_ISLNK(mode) || (openMode & O_EXCL) != 0)
				return B_FILE_EXISTS;

			Vnode vnode(volume, entryID);
			Inode* inode;

			status = vnode.Get(&inode);
			if (status != B_OK) {
				TRACE("Inode::Create() Failed to get the inode from the "
					"vnode\n");
				return B_ENTRY_NOT_FOUND;
			}

			if (inode->IsDirectory() && (openMode & O_RWMASK) != O_RDONLY)
				return B_IS_A_DIRECTORY;
			if ((openMode & O_DIRECTORY) != 0 && !inode->IsDirectory())
				return B_NOT_A_DIRECTORY;

			if (inode->CheckPermissions(open_mode_to_access(openMode)
					| ((openMode & O_TRUNC) != 0 ? W_OK : 0)) != B_OK)
				return B_NOT_ALLOWED;

			if ((openMode & O_TRUNC) != 0) {
				// Truncate requested
				TRACE("Inode::Create(): Truncating file\n");
				inode->WriteLockInTransaction(transaction);

				status = inode->Resize(transaction, 0);
				if (status != B_OK)
					return status;
			}

			if (_created != NULL)
				*_created = false;
			if (_id != NULL)
				*_id = inode->ID();
			if (_inode != NULL)
				*_inode = inode;

			if (_id != NULL || _inode != NULL)
				vnode.Keep();

			TRACE("Inode::Create(): Done opening file\n");
			return B_OK;
		/*} else if ((mode & S_ATTR_DIR) == 0) {
			TRACE("Inode::Create(): (mode & S_ATTR_DIR) == 0\n");
			return B_BAD_VALUE;*/
		} else if ((openMode & O_DIRECTORY) != 0) {
			TRACE("Inode::Create(): (openMode & O_DIRECTORY) != 0\n");
			return B_ENTRY_NOT_FOUND;
		}

		// Return to initial position
		TRACE("Inode::Create(): Restarting iterator\n");
		entries->Restart();
	}

	status_t status;
	if (parent != NULL) {
		status = parent->CheckPermissions(W_OK);
		if (status != B_OK)
			return status;
	}

	TRACE("Inode::Create(): Allocating inode\n");
	ino_t id;
	status = volume->AllocateInode(transaction, parent, mode, id);
	if (status != B_OK) {
		ERROR("Inode::Create(): AllocateInode() failed\n");
		return status;
	}

	if (entries != NULL) {
		size_t nameLength = strlen(name);
		status = entries->AddEntry(transaction, name, nameLength, id, type);
		if (status != B_OK) {
			ERROR("Inode::Create(): AddEntry() failed\n");
			return status;
		}
	}

	TRACE("Inode::Create(): Creating inode\n");
	Inode* inode = new(std::nothrow) Inode(volume);
	if (inode == NULL)
		return B_NO_MEMORY;

	TRACE("Inode::Create(): Getting node structure\n");
	ext2_inode& node = inode->Node();
	TRACE("Inode::Create(): Initializing inode data\n");
	memset(&node, 0, sizeof(ext2_inode));
	node.SetMode(mode);
	node.SetUserID(geteuid());
	node.SetGroupID(parent != NULL ? parent->Node().GroupID() : getegid());
	node.SetNumLinks(inode->IsDirectory() ? 2 : 1);
	TRACE("Inode::Create(): Updating time\n");
	struct timespec timespec;
	_BigtimeToTimespec(real_time_clock_usecs(), &timespec);
	inode->SetAccessTime(&timespec);
	inode->SetCreationTime(&timespec);
	inode->SetModificationTime(&timespec);
	node.SetFlags(parent->Flags() & EXT2_INODE_INHERITED);
	if (volume->HasExtentsFeature() 
		&& (inode->IsDirectory() || inode->IsFile())) {
		node.SetFlag(EXT2_INODE_EXTENTS);
		ExtentStream stream(volume, &node.extent_stream, 0);
		stream.Init();
		ASSERT(stream.Check());
	}

	if (sizeof(ext2_inode) < volume->InodeSize())
		node.SetExtraInodeSize(sizeof(ext2_inode) - EXT2_INODE_NORMAL_SIZE);

	TRACE("Inode::Create(): Updating ID\n");
	inode->fID = id;

	if (inode->IsDirectory()) {
		TRACE("Inode::Create(): Initializing directory\n");
		status = inode->InitDirectory(transaction, parent);
		if (status != B_OK) {
			ERROR("Inode::Create(): InitDirectory() failed\n");
			delete inode;
			return status;
		}
	}

	// TODO: Maybe it can be better
	/*if (volume->HasExtendedAttributes()) {
		TRACE("Inode::Create(): Initializing extended attributes\n");
		uint32 blockGroup = 0;
		uint32 pos = 0;
		uint32 allocated;

		status = volume->AllocateBlocks(transaction, 1, 1, blockGroup, pos,
			allocated);
		if (status != B_OK)
			return status;

		// Clear the new block
		uint32 blockNum = volume->FirstDataBlock() + pos +
			volume->BlocksPerGroup() * blockGroup;
		CachedBlock cached(volume);
		cached.SetToWritable(transaction, blockNum, true);

		node.SetExtendedAttributesBlock(blockNum);
	}*/

	TRACE("Inode::Create(): Saving inode\n");
	status = inode->WriteBack(transaction);
	if (status != B_OK) {
		delete inode;
		return status;
	}

	TRACE("Inode::Create(): Creating vnode\n");

	Vnode vnode;
	status = vnode.Publish(transaction, inode, vnodeOps, publishFlags);
	if (status != B_OK)
		return status;

	if (!inode->IsSymLink()) {
		// Vnode::Publish doesn't publish symlinks
		if (!inode->IsDirectory()) {
			status = inode->EnableFileCache();
			if (status != B_OK)
				return status;
		}

		inode->WriteLockInTransaction(transaction);
	}

	if (_created)
		*_created = true;
	if (_id != NULL)
		*_id = id;
	if (_inode != NULL)
		*_inode = inode;

	if (_id != NULL || _inode != NULL)
		vnode.Keep();

	TRACE("Inode::Create(): Deleting entries iterator\n");
	DirectoryIterator* iterator = entriesDeleter.Detach();
	TRACE("Inode::Create(): Entries iterator: %p\n", entries);
	delete iterator;
	TRACE("Inode::Create(): Done\n");

	return B_OK;
}
예제 #4
0
static status_t
ext2_rename(fs_volume* _volume, fs_vnode* _oldDir, const char* oldName,
	fs_vnode* _newDir, const char* newName)
{
	TRACE("ext2_rename()\n");

	Volume* volume = (Volume*)_volume->private_volume;
	Inode* oldDirectory = (Inode*)_oldDir->private_node;
	Inode* newDirectory = (Inode*)_newDir->private_node;

	if (oldDirectory == newDirectory && strcmp(oldName, newName) == 0)
		return B_OK;

	Transaction transaction(volume->GetJournal());

	oldDirectory->WriteLockInTransaction(transaction);
	if (oldDirectory != newDirectory)
		newDirectory->WriteLockInTransaction(transaction);

	status_t status = oldDirectory->CheckPermissions(W_OK);
	if (status == B_OK)
		status = newDirectory->CheckPermissions(W_OK);
	if (status != B_OK)
		return status;

	HTree oldHTree(volume, oldDirectory);
	DirectoryIterator* oldIterator;

	status = oldHTree.Lookup(oldName, &oldIterator);
	if (status != B_OK)
		return status;

	ObjectDeleter<DirectoryIterator> oldIteratorDeleter(oldIterator);

	ino_t oldID;
	status = oldIterator->FindEntry(oldName, &oldID);
	if (status != B_OK)
		return status;

	if (oldDirectory != newDirectory) {
		TRACE("ext2_rename(): Different parent directories\n");
		CachedBlock cached(volume);

		ino_t parentID = newDirectory->ID();
		ino_t oldDirID = oldDirectory->ID();

		do {
			Vnode vnode(volume, parentID);
			Inode* parent;

			status = vnode.Get(&parent);
			if (status != B_OK)
				return B_IO_ERROR;

			fsblock_t blockNum;
			status = parent->FindBlock(0, blockNum);
			if (status != B_OK)
				return status;

			const HTreeRoot* data = (const HTreeRoot*)cached.SetTo(blockNum);
			parentID = data->dotdot.InodeID();
		} while (parentID != oldID && parentID != oldDirID
			&& parentID != EXT2_ROOT_NODE);

		if (parentID == oldID)
			return B_BAD_VALUE;
	}

	HTree newHTree(volume, newDirectory);
	DirectoryIterator* newIterator;

	status = newHTree.Lookup(newName, &newIterator);
	if (status != B_OK)
		return status;

	ObjectDeleter<DirectoryIterator> newIteratorDeleter(newIterator);

	Vnode vnode(volume, oldID);
	Inode* inode;

	status = vnode.Get(&inode);
	if (status != B_OK)
		return status;

	uint8 fileType;

	// TODO: Support all file types?
	if (inode->IsDirectory())
		fileType = EXT2_TYPE_DIRECTORY;
	else if (inode->IsSymLink())
		fileType = EXT2_TYPE_SYMLINK;
	else
		fileType = EXT2_TYPE_FILE;

	// Add entry in destination directory
	ino_t existentID;
	status = newIterator->FindEntry(newName, &existentID);
	if (status == B_OK) {
		if (existentID == oldID) {
			// Remove entry in oldID
			// return inode->Unlink();
			return B_BAD_VALUE;
		}

		Vnode vnodeExistent(volume, existentID);
		Inode* existent;

		if (vnodeExistent.Get(&existent) != B_OK)
			return B_NAME_IN_USE;

		if (existent->IsDirectory() != inode->IsDirectory()) {
			return existent->IsDirectory() ? B_IS_A_DIRECTORY
				: B_NOT_A_DIRECTORY;
		}

		// TODO: Perhaps we have to revert this in case of error?
		status = newIterator->ChangeEntry(transaction, oldID, fileType);
		if (status != B_OK)
			return status;

		notify_entry_removed(volume->ID(), newDirectory->ID(), newName,
			existentID);
	} else if (status == B_ENTRY_NOT_FOUND) {
		newIterator->Restart();

		status = newIterator->AddEntry(transaction, newName, strlen(newName),
			oldID, fileType);
		if (status != B_OK)
			return status;
	} else
		return status;

	// Remove entry from source folder
	status = oldIterator->RemoveEntry(transaction);
	if (status != B_OK)
		return status;

	inode->WriteLockInTransaction(transaction);

	if (oldDirectory != newDirectory && inode->IsDirectory()) {
		DirectoryIterator inodeIterator(inode);

		status = inodeIterator.FindEntry("..");
		if (status == B_ENTRY_NOT_FOUND) {
			TRACE("Corrupt file system. Missing \"..\" in directory %"
				B_PRIdINO "\n", inode->ID());
			return B_BAD_DATA;
		} else if (status != B_OK)
			return status;

		inodeIterator.ChangeEntry(transaction, newDirectory->ID(),
			(uint8)EXT2_TYPE_DIRECTORY);
	}

	status = inode->WriteBack(transaction);
	if (status != B_OK)
		return status;

	entry_cache_remove(volume->ID(), oldDirectory->ID(), oldName);
	entry_cache_add(volume->ID(), newDirectory->ID(), newName, oldID);

	status = transaction.Done();
	if (status != B_OK) {
		entry_cache_remove(volume->ID(), oldDirectory->ID(), newName);
		entry_cache_add(volume->ID(), newDirectory->ID(), oldName, oldID);

		return status;
	}

	notify_entry_moved(volume->ID(), oldDirectory->ID(), oldName,
		newDirectory->ID(), newName, oldID);

	return B_OK;
}