Here are the classes, structs, unions and interfaces with brief descriptions:

Nstorage	The storage namespace
CAborted
CActiongraph	The actiongraph has all actions including the dependencies among them to get from one devicegraph to another
CActivateCallbacks	Other storage subsystems are activated automatically, e.g
CActivateCallbacksLuks	Specialized callbacks with a more generic parameter for LUKS activation
CActivateCallbacksV3	Specialized callbacks with a more generic parameter for Bitlocker activation
CAlignError
CAlignment	A class to calculate partition alignment based on hardware topology
CArch
CBcache	A bcache device
CBcacheCset	A bcache cache set
CBcachefs	Class to represent a Bcachefs filesystem https://en.wikipedia.org/wiki/Bcachefs in the devicegraph
CBitlocker	Class for BitLocker filesystem
CBitlockerInfo	Stores information about a Bitlocker device
CBitlockerV2	A BitLocker layer on a block device
CBlkDevice	An abstract Block Device
CBlkFilesystem
CBtrfs	Class to represent a btrfs filesystem https://en.wikipedia.org/wiki/Btrfs in the devicegraph
CBtrfsQgroup	Class to represent a qgroup of a btrfs filesystem
CBtrfsQgroupNotFoundById
CBtrfsQgroupRelation	Relation between btrfs quota groups
CBtrfsSubvolume	Class to represent a btrfs subvolume in the devicegraph
CBtrfsSubvolumeNotFoundByPath
CCallbacks
CCheckCallbacks
CCodeLocation	Helper class for UI exceptions: Store BASE_FILE, FUNCTION and LINE
CCommitCallbacks
CCommitCallbacksV2
CCommitOptions
CCompoundAction	A Compound Action groups several related actions from an actiongraph
CContentInfo
CDasd	A physical DASD device
CDasdPt
CDeactivateStatus
CDeactivateStatusV2	Provides information whether deactivate_v2() was able to deactivate subsystems
CDevice	An abstract base class for storage devices
CDevicegraph	The main container of the libstorage-ng
CDevicegraphStyleCallbacks	Style callbacks used by Devicegraph::write_graphviz()
CDeviceHasWrongType
CDeviceNotFound
CDeviceNotFoundByName
CDeviceNotFoundBySid
CDeviceNotFoundByUuid
CDifferentBlockSizes
CDisk	A physical disk device
CDmRaid	A DM RAID device
CEncryption	An encryption layer on a blk device
CEnvironment
CErofs	Class for EROFS filesystem
CException	Base class for storage exceptions
CExfat	Class to represent an exFAT filesystem https://en.wikipedia.org/wiki/ExFAT in the devicegraph
CExt	Abstract base class for Ext2, Ext3 and Ext4
CExt2	Class to represent an Ext2 filesystem https://en.wikipedia.org/wiki/Ext2 in the devicegraph
CExt3	Class to represent an Ext3 filesystem https://en.wikipedia.org/wiki/Ext3 in the devicegraph
CExt4	Class to represent an Ext4 filesystem https://en.wikipedia.org/wiki/Ext4 in the devicegraph
CF2fs	Class to represent a F2FS (https://en.wikipedia.org/wiki/F2FS) in the devicegraph
CFilesystem
CFilesystemUser	Holder from BlkDevice to a BlkFilesystem
CGpt
CGraphStyleCallbacks	Base class for DevicegraphStyleCallbacks and ActiongraphStyleCallbacks
CHolder	An abstract base class for storage holders
CHolderAlreadyExists
CHolderHasWrongType
CHolderNotFound
CHolderNotFoundBySids
CImplicitPt	Class to represent implicit partition table
CIndexOutOfRangeException	Exception class for "index out of range"
CInvalidBlockSize
CInvalidChunkSize
CInvalidExtentSize
CInvalidMountPointPath
CInvalidStripeSize
CIOException	Exception class for IO errors
CIso9660	Class for ISO9660 filesystem
CJfs	Class to represent a JFS filesystem https://en.wikipedia.org/wiki/JFS_(file_system) in the devicegraph
CLockException	Exception indicating that getting the lock failed
CLogger	The Logger class
CLogicException	Exception class for faulty logic within the program
CLuks	An LUKS encryption layer on a block device
CLuksInfo	Stores information about a LUKS device
CLvmDevicesFile
CLvmLv	A Logical Volume of the Logical Volume Manager (LVM)
CLvmLvNotFoundByLvName
CLvmPv
CLvmVg	A Volume Group of the Logical Volume Manager (LVM)
CLvmVgNotFoundByVgName
CMd	A MD device
CMdContainer	A MD Container
CMdMember	A MD member
CMdSubdevice	Holder from a MdContainer to a MdMember
CMdUser	Holder from a BlkDevice to an Md
CMountable
CMountPoint	Class to represent a mount point
CMsdos
CMultipath	A multipath device
CNfs	Class to represent a NFS mount
CNfsNotFoundByServerAndPath
CNilfs2	Class to represent a NILFS2 (https://en.wikipedia.org/wiki/NILFS2) in the devicegraph
CNoIntersection
CNotInside
CNtfs	Class to represent an NTFS filesystem https://en.wikipedia.org/wiki/NTFS in the devicegraph
CNullPointerException	Exception class for generic null pointer exceptions
COutOfMemoryException	Exception class for "out of memory"
COverflowException	Exception class for "overflow"
CParseException	Exception class for parse errors, e.g
CPartition	A partition of a Partitionable, e.g
CPartitionable
CPartitionSlot	Number and name are only valid if one of the possible flags is true
CPartitionTable
CPlainEncryption	An plain encryption layer on a block device
CPool	A pool represents a collection of devices
CPoolOutOfSpace	Exception to report that the pool is out of space to fulfill the request
CProbeCallbacks
CProbeCallbacksV2
CProbeCallbacksV3
CProbeCallbacksV4
CRegion	A start/length pair with a block size
CReiserfs	Class to represent a ReiserFS filesystem https://en.wikipedia.org/wiki/ReiserFS in the devicegraph
CRemoteCallbacks
CRemoteCallbacksV2
CRemoteCommand	A result of an unnamed command: stdout + stderr + exit_code
CRemoteFile	Contents of an unnamed file (vector of lines)
CRemoveInfo
CResizeInfo
CSilencer	Class to make some exceptions log-level DEBUG instead of WARNING
CSimpleEtcCrypttabEntry	A simple struct to hold the information from one line in crypttab
CSimpleEtcFstabEntry	A simple struct to hold the information from one line in fstab
CSnapshot	Relationship between origin and snapshot
CSpaceInfo
CSquashfs	Class for Squashfs filesystem
CStorage	The main entry point to libstorage
CStrayBlkDevice	This class represents stray block devices
CSubdevice	Generic holder from one device to a subdevice, e.g
CSwap	Class to represent a swap filesystem in the devicegraph
CSystemInfo	Keeps various system information
CTmpfs	Class to represent a tmpfs
CTopology	A class to represent hardware alignment information
CUdf	Class for UDF filesystem
CUnsupportedException	Exception class for unsupported features and operations
CUser	Generic holder from one device to another device, e.g
CVfat	Class to represent an VFAT filesystem https://en.wikipedia.org/wiki/Vfat in the devicegraph
CWrongNumberOfChildren
CWrongNumberOfHolders
CWrongNumberOfParents
CXfs	Class to represent an XFS filesystem https://en.wikipedia.org/wiki/Xfs in the devicegraph