devicemapper

package
v1.5.0-rc3 Latest Latest
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 Go to latest Published: Feb 3, 2015 License: Apache-2.0 Imports: 9 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	BlkGetSize64 = C.BLKGETSIZE64
	BlkDiscard   = C.BLKDISCARD

	LoopSetFd       = C.LOOP_SET_FD
	LoopCtlGetFree  = C.LOOP_CTL_GET_FREE
	LoopGetStatus64 = C.LOOP_GET_STATUS64
	LoopSetStatus64 = C.LOOP_SET_STATUS64
	LoopClrFd       = C.LOOP_CLR_FD
	LoopSetCapacity = C.LOOP_SET_CAPACITY
)

IOCTL consts

View Source 
const (
	LoFlagsAutoClear = C.LO_FLAGS_AUTOCLEAR
	LoFlagsReadOnly  = C.LO_FLAGS_READ_ONLY
	LoFlagsPartScan  = C.LO_FLAGS_PARTSCAN
	LoKeySize        = C.LO_KEY_SIZE
	LoNameSize       = C.LO_NAME_SIZE
)
View Source 
const (
	DmUdevDisableSubsystemRulesFlag = C.DM_UDEV_DISABLE_SUBSYSTEM_RULES_FLAG
	DmUdevDisableDiskRulesFlag      = C.DM_UDEV_DISABLE_DISK_RULES_FLAG
	DmUdevDisableOtherRulesFlag     = C.DM_UDEV_DISABLE_OTHER_RULES_FLAG
	DmUdevDisableLibraryFallback    = C.DM_UDEV_DISABLE_LIBRARY_FALLBACK
)
View Source 
const (
	LogLevelFatal  = 2 + iota // _LOG_FATAL
	LogLevelErr               // _LOG_ERR
	LogLevelWarn              // _LOG_WARN
	LogLevelNotice            // _LOG_NOTICE
	LogLevelInfo              // _LOG_INFO
	LogLevelDebug             // _LOG_DEBUG
)

definitions from lvm2 lib/log/log.h

Variables

View Source 
var (
	ErrTaskRun                = errors.New("dm_task_run failed")
	ErrTaskSetName            = errors.New("dm_task_set_name failed")
	ErrTaskSetMessage         = errors.New("dm_task_set_message failed")
	ErrTaskSetAddNode         = errors.New("dm_task_set_add_node failed")
	ErrTaskSetRo              = errors.New("dm_task_set_ro failed")
	ErrTaskAddTarget          = errors.New("dm_task_add_target failed")
	ErrTaskSetSector          = errors.New("dm_task_set_sector failed")
	ErrTaskGetDeps            = errors.New("dm_task_get_deps failed")
	ErrTaskGetInfo            = errors.New("dm_task_get_info failed")
	ErrTaskGetDriverVersion   = errors.New("dm_task_get_driver_version failed")
	ErrTaskSetCookie          = errors.New("dm_task_set_cookie failed")
	ErrNilCookie              = errors.New("cookie ptr can't be nil")
	ErrAttachLoopbackDevice   = errors.New("loopback mounting failed")
	ErrGetBlockSize           = errors.New("Can't get block size")
	ErrUdevWait               = errors.New("wait on udev cookie failed")
	ErrSetDevDir              = errors.New("dm_set_dev_dir failed")
	ErrGetLibraryVersion      = errors.New("dm_get_library_version failed")
	ErrCreateRemoveTask       = errors.New("Can't create task of type DeviceRemove")
	ErrRunRemoveDevice        = errors.New("running RemoveDevice failed")
	ErrInvalidAddNode         = errors.New("Invalid AddNode type")
	ErrGetLoopbackBackingFile = errors.New("Unable to get loopback backing file")
	ErrLoopbackSetCapacity    = errors.New("Unable set loopback capacity")
	ErrBusy                   = errors.New("Device is Busy")
	ErrDeviceIdExists         = errors.New("Device Id Exists")
)
View Source 
var (
	DmGetLibraryVersion    = dmGetLibraryVersionFct
	DmGetNextTarget        = dmGetNextTargetFct
	DmLogInitVerbose       = dmLogInitVerboseFct
	DmSetDevDir            = dmSetDevDirFct
	DmTaskAddTarget        = dmTaskAddTargetFct
	DmTaskCreate           = dmTaskCreateFct
	DmTaskDestroy          = dmTaskDestroyFct
	DmTaskGetDeps          = dmTaskGetDepsFct
	DmTaskGetInfo          = dmTaskGetInfoFct
	DmTaskGetDriverVersion = dmTaskGetDriverVersionFct
	DmTaskRun              = dmTaskRunFct
	DmTaskSetAddNode       = dmTaskSetAddNodeFct
	DmTaskSetCookie        = dmTaskSetCookieFct
	DmTaskSetMessage       = dmTaskSetMessageFct
	DmTaskSetName          = dmTaskSetNameFct
	DmTaskSetRo            = dmTaskSetRoFct
	DmTaskSetSector        = dmTaskSetSectorFct
	DmUdevWait             = dmUdevWaitFct
	DmUdevSetSyncSupport   = dmUdevSetSyncSupportFct
	DmUdevGetSyncSupport   = dmUdevGetSyncSupportFct
	LogWithErrnoInit       = logWithErrnoInitFct
)

Functions

func ActivateDevice 

func ActivateDevice(poolName string, name string, deviceId int, size uint64) error

func AttachLoopDevice 

func AttachLoopDevice(sparseName string) (loop *os.File, err error)

attachLoopDevice attaches the given sparse file to the next available loopback device. It returns an opened *os.File.

func BlockDeviceDiscard 

func BlockDeviceDiscard(path string) error

func CreateDevice 

func CreateDevice(poolName string, deviceId int) error

func CreatePool 

func CreatePool(poolName string, dataFile, metadataFile *os.File, poolBlockSize uint32) error

This is the programmatic example of "dmsetup create"

func CreateSnapDevice 

func CreateSnapDevice(poolName string, deviceId int, baseName string, baseDeviceId int) error

func DeleteDevice 

func DeleteDevice(poolName string, deviceId int) error

func DeviceIdExists 

func DeviceIdExists(err error) bool

Returns whether error conveys the information about device Id already exist or not. This will be true if device creation or snap creation operation fails if device or snap device already exists in pool. Current implementation is little crude as it scans the error string for exact pattern match. Replacing it with more robust implementation is desirable.

func DevmapperLogCallback 

func DevmapperLogCallback(level C.int, file *C.char, line C.int, dm_errno_or_class C.int, message *C.char)

func FindLoopDeviceFor 

func FindLoopDeviceFor(file *os.File) *os.File

func GetBlockDeviceSize 

func GetBlockDeviceSize(file *os.File) (uint64, error)

func GetDriverVersion 

func GetDriverVersion() (string, error)

func GetLibraryVersion 

func GetLibraryVersion() (string, error)

func GetStatus 

func GetStatus(name string) (uint64, uint64, string, string, error)

func LogInit 

func LogInit(logger DevmapperLogger)

initialize the logger for the device mapper library

func LogInitVerbose 

func LogInitVerbose(level int)

func LoopbackSetCapacity 

func LoopbackSetCapacity(file *os.File) error

func ReloadPool 

func ReloadPool(poolName string, dataFile, metadataFile *os.File, poolBlockSize uint32) error

func RemoveDevice 

func RemoveDevice(name string) error

Useful helper for cleanup

func ResumeDevice 

func ResumeDevice(name string) error

func SetDevDir 

func SetDevDir(dir string) error

func SetTransactionId 

func SetTransactionId(poolName string, oldId uint64, newId uint64) error

func SuspendDevice 

func SuspendDevice(name string) error

func UdevSetSyncSupport added in v1.5.0 

func UdevSetSyncSupport(enable bool) bool

UdevSetSyncSupport allows setting whether the udev sync should be enabled. The return bool indicates the state of whether the sync is enabled.

func UdevSyncSupported added in v1.5.0 

func UdevSyncSupported() bool

UdevSyncSupported returns whether device-mapper is able to sync with udev

This is essential otherwise race conditions can arise where both udev and device-mapper attempt to create and destroy devices.

func UdevWait 

func UdevWait(cookie uint) error

Types

type AddNodeType 

type AddNodeType int
const (
	AddNodeOnResume AddNodeType = iota
	AddNodeOnCreate
)

type CDmTask 

type CDmTask C.struct_dm_task

type CLoopInfo64 

type CLoopInfo64 C.struct_loop_info64

type Deps 

type Deps struct {
	Count  uint32
	Filler uint32
	Device []uint64
}

func GetDeps 

func GetDeps(name string) (*Deps, error)

type DevmapperLogger 

type DevmapperLogger interface {
	DMLog(level int, file string, line int, dmError int, message string)
}

type Info 

type Info struct {
	Exists        int
	Suspended     int
	LiveTable     int
	InactiveTable int
	OpenCount     int32
	EventNr       uint32
	Major         uint32
	Minor         uint32
	ReadOnly      int
	TargetCount   int32
}

func GetInfo 

func GetInfo(name string) (*Info, error)

type LoopInfo64 

type LoopInfo64 struct {
	// contains filtered or unexported fields
}

type Task 

type Task struct {
	// contains filtered or unexported fields
}

func TaskCreate 

func TaskCreate(tasktype TaskType) *Task

TaskCreate initializes a devicemapper task of tasktype

func TaskCreateNamed 

func TaskCreateNamed(t TaskType, name string) (*Task, error)

TaskCreateNamed is a convenience function for TaskCreate when a name will be set on the task as well

func (*Task) AddTarget 

func (t *Task) AddTarget(start, size uint64, ttype, params string) error

func (*Task) GetDeps 

func (t *Task) GetDeps() (*Deps, error)

func (*Task) GetDriverVersion 

func (t *Task) GetDriverVersion() (string, error)

func (*Task) GetInfo 

func (t *Task) GetInfo() (*Info, error)

func (*Task) GetNextTarget 

func (t *Task) GetNextTarget(next uintptr) (nextPtr uintptr, start uint64,
	length uint64, targetType string, params string)

func (*Task) Run 

func (t *Task) Run() error

func (*Task) SetAddNode 

func (t *Task) SetAddNode(addNode AddNodeType) error

func (*Task) SetCookie 

func (t *Task) SetCookie(cookie *uint, flags uint16) error

func (*Task) SetMessage 

func (t *Task) SetMessage(message string) error

func (*Task) SetName 

func (t *Task) SetName(name string) error

func (*Task) SetRo 

func (t *Task) SetRo() error

func (*Task) SetSector 

func (t *Task) SetSector(sector uint64) error

type TaskType 

type TaskType int
const (
	DeviceCreate TaskType = iota
	DeviceReload
	DeviceRemove
	DeviceRemoveAll
	DeviceSuspend
	DeviceResume
	DeviceInfo
	DeviceDeps
	DeviceRename
	DeviceVersion
	DeviceStatus
	DeviceTable
	DeviceWaitevent
	DeviceList
	DeviceClear
	DeviceMknodes
	DeviceListVersions
	DeviceTargetMsg
	DeviceSetGeometry
)

Source Files

View all Source files

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