C++ Inode::ID方法代码示例

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;
}

static status_t
btrfs_read_stat(fs_volume* _volume, fs_vnode* _node, struct stat* stat)
{
	Inode* inode = (Inode*)_node->private_node;
	
	stat->st_dev = inode->GetVolume()->ID();
	stat->st_ino = inode->ID();
	stat->st_nlink = 1;
	stat->st_blksize = BTRFS_IO_SIZE;

	stat->st_uid = inode->UserID();
	stat->st_gid = inode->GroupID();
	stat->st_mode = inode->Mode();
	stat->st_type = 0;

	inode->GetAccessTime(stat->st_atim);
	inode->GetModificationTime(stat->st_mtim);
	inode->GetChangeTime(stat->st_ctim);
	inode->GetCreationTime(stat->st_crtim);

	stat->st_size = inode->Size();
	stat->st_blocks = (inode->Size() + 511) / 512;

	return B_OK;
}

static status_t
ext2_get_file_map(fs_volume* _volume, fs_vnode* _node, off_t offset,
	size_t size, struct file_io_vec* vecs, size_t* _count)
{
	TRACE("ext2_get_file_map()\n");
	Volume* volume = (Volume*)_volume->private_volume;
	Inode* inode = (Inode*)_node->private_node;
	size_t index = 0, max = *_count;

	while (true) {
		fsblock_t block;
		uint32 count = 1;
		status_t status = inode->FindBlock(offset, block, &count);
		if (status != B_OK)
			return status;

		if (block > volume->NumBlocks()) {
			panic("ext2_get_file_map() found block %" B_PRIu64 " for offset %"
				B_PRIdOFF "\n", block, offset);
		}

		off_t blockOffset = block << volume->BlockShift();
		uint32 blockLength = volume->BlockSize() * count;

		if (index > 0 && (vecs[index - 1].offset
				== blockOffset - vecs[index - 1].length
				|| (vecs[index - 1].offset == -1 && block == 0))) {
			vecs[index - 1].length += blockLength;
		} else {
			if (index >= max) {
				// we're out of file_io_vecs; let's bail out
				*_count = index;
				return B_BUFFER_OVERFLOW;
			}

			// 'block' is 0 for sparse blocks
			if (block != 0)
				vecs[index].offset = blockOffset;
			else
				vecs[index].offset = -1;

			vecs[index].length = blockLength;
			index++;
		}

		offset += blockLength;

		if (offset >= inode->Size() || size <= blockLength) {
			// We're done!
			*_count = index;
			TRACE("ext2_get_file_map for inode %" B_PRIdINO "\n", inode->ID());
			return B_OK;
		}

		size -= blockLength;
	}

	// can never get here
	return B_ERROR;
}

static status_t
ext2_read_attr_dir(fs_volume* _volume, fs_vnode* _node,
				void* _cookie, struct dirent* dirent, size_t bufferSize,
				uint32* _num)
{
	Inode* inode = (Inode*)_node->private_node;
	int32 index = *(int32 *)_cookie;
	Attribute attribute(inode);
	TRACE("%s()\n", __FUNCTION__);

	size_t length = bufferSize;
	status_t status = attribute.Find(index);
	if (status == B_ENTRY_NOT_FOUND) {
		*_num = 0;
		return B_OK;
	} else if (status != B_OK)
		return status;

	status = attribute.GetName(dirent->d_name, &length);
	if (status != B_OK)
		return B_OK;

	Volume* volume = (Volume*)_volume->private_volume;

	dirent->d_dev = volume->ID();
	dirent->d_ino = inode->ID();
	dirent->d_reclen = sizeof(struct dirent) + length;

	*_num = 1;
	*(int32*)_cookie = index + 1;
	return B_OK;
}

static status_t
ext2_write(fs_volume* _volume, fs_vnode* _node, void* _cookie, off_t pos,
	const void* buffer, size_t* _length)
{
	TRACE("ext2_write()\n");
	Volume* volume = (Volume*)_volume->private_volume;
	Inode* inode = (Inode*)_node->private_node;

	if (volume->IsReadOnly())
		return B_READ_ONLY_DEVICE;

	if (inode->IsDirectory()) {
		*_length = 0;
		return B_IS_A_DIRECTORY;
	}

	TRACE("ext2_write(): Preparing cookie\n");

	file_cookie* cookie = (file_cookie*)_cookie;

	if ((cookie->open_mode & O_APPEND) != 0)
		pos = inode->Size();

	TRACE("ext2_write(): Creating transaction\n");
	Transaction transaction;

	status_t status = inode->WriteAt(transaction, pos, (const uint8*)buffer,
		_length);
	if (status == B_OK)
		status = transaction.Done();
	if (status == B_OK) {
		TRACE("ext2_write(): Finalizing\n");
		ReadLocker lock(*inode->Lock());

		if (cookie->last_size != inode->Size()
			&& system_time() > cookie->last_notification
				+ INODE_NOTIFICATION_INTERVAL) {
			notify_stat_changed(volume->ID(), -1, inode->ID(),
				B_STAT_MODIFICATION_TIME | B_STAT_SIZE | B_STAT_INTERIM_UPDATE);
			cookie->last_size = inode->Size();
			cookie->last_notification = system_time();
		}
	}

	TRACE("ext2_write(): Done\n");

	return status;
}

status_t
Inode::Unlink(Transaction& transaction)
{
	uint32 numLinks = fNode.NumLinks();
	TRACE("Inode::Unlink(): Current links: %lu\n", numLinks);

	if (numLinks == 0)
		return B_BAD_VALUE;

	if ((IsDirectory() && numLinks == 2) || (numLinks == 1))  {
		fUnlinked = true;

		TRACE("Inode::Unlink(): Putting inode in orphan list\n");
		ino_t firstOrphanID;
		status_t status = fVolume->SaveOrphan(transaction, fID, firstOrphanID);
		if (status != B_OK)
			return status;

		if (firstOrphanID != 0) {
			Vnode firstOrphan(fVolume, firstOrphanID);
			Inode* nextOrphan;

			status = firstOrphan.Get(&nextOrphan);
			if (status != B_OK)
				return status;

			fNode.SetNextOrphan(nextOrphan->ID());
		} else {
			// Next orphan link is stored in deletion time
			fNode.deletion_time = 0;
		}

		fNode.num_links = 0;

		status = remove_vnode(fVolume->FSVolume(), fID);
		if (status != B_OK)
			return status;
	} else
		fNode.SetNumLinks(--numLinks);

	return WriteBack(transaction);
}

/*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);
//.........这里部分代码省略.........

static status_t
nfs4_mount(fs_volume* volume, const char* device, uint32 flags,
			const char* args, ino_t* _rootVnodeID)
{
	TRACE("volume = %p, device = %s, flags = %" B_PRIu32 ", args = %s", volume,
		device, flags, args);

	status_t result;

	/* prepare idmapper server */
	MutexLocker locker(gIdMapperLock);
	gIdMapper = new(std::nothrow) IdMap;
	if (gIdMapper == NULL)
		return B_NO_MEMORY;

	result = gIdMapper->InitStatus();
	if (result != B_OK) {
		delete gIdMapper;
		gIdMapper = NULL;
		return result;
	}
	locker.Unlock();

	AddressResolver* resolver;
	MountConfiguration config;
	char* path;
	result = ParseArguments(args, &resolver, &path, &config);
	if (result != B_OK)
		return result;
	MemoryDeleter pathDeleter(path);

	RPC::Server* server;
	result = gRPCServerManager->Acquire(&server, resolver, CreateNFS4Server);
	delete resolver;
	if (result != B_OK)
		return result;
	
	FileSystem* fs;
	result = FileSystem::Mount(&fs, server, path, volume->id, config);
	if (result != B_OK) {
		gRPCServerManager->Release(server);
		return result;
	}

	Inode* inode = fs->Root();
	if (inode == NULL) {
		delete fs;
		gRPCServerManager->Release(server);

		return B_IO_ERROR;
	}

	volume->private_volume = fs;
	volume->ops = &gNFSv4VolumeOps;

	VnodeToInode* vti = new VnodeToInode(inode->ID(), fs);
	if (vti == NULL) {
		delete fs;
		gRPCServerManager->Release(server);
		return B_NO_MEMORY;
	}

	vti->Replace(inode);
	result = publish_vnode(volume, inode->ID(), vti, &gNFSv4VnodeOps,
							inode->Type(), 0);
	if (result != B_OK)
		return result;

	*_rootVnodeID = inode->ID();

	TRACE("*_rootVnodeID = %" B_PRIi64, inode->ID());

	return B_OK;
}