229 lines
5.9 KiB
Go
229 lines
5.9 KiB
Go
// +build linux
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package devmapper
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/*
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#cgo LDFLAGS: -L. -ldevmapper
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#include <libdevmapper.h>
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#include <linux/loop.h> // FIXME: present only for defines, maybe we can remove it?
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#include <linux/fs.h> // FIXME: present only for BLKGETSIZE64, maybe we can remove it?
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#ifndef LOOP_CTL_GET_FREE
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#define LOOP_CTL_GET_FREE 0x4C82
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#endif
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#ifndef LO_FLAGS_PARTSCAN
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#define LO_FLAGS_PARTSCAN 8
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#endif
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// FIXME: Can't we find a way to do the logging in pure Go?
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extern void DevmapperLogCallback(int level, char *file, int line, int dm_errno_or_class, char *str);
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static void log_cb(int level, const char *file, int line, int dm_errno_or_class, const char *f, ...)
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{
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char buffer[256];
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va_list ap;
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va_start(ap, f);
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vsnprintf(buffer, 256, f, ap);
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va_end(ap);
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DevmapperLogCallback(level, (char *)file, line, dm_errno_or_class, buffer);
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}
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static void log_with_errno_init()
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{
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dm_log_with_errno_init(log_cb);
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}
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*/
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import "C"
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import (
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"unsafe"
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)
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type (
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CDmTask C.struct_dm_task
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CLoopInfo64 C.struct_loop_info64
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LoopInfo64 struct {
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loDevice uint64 /* ioctl r/o */
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loInode uint64 /* ioctl r/o */
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loRdevice uint64 /* ioctl r/o */
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loOffset uint64
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loSizelimit uint64 /* bytes, 0 == max available */
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loNumber uint32 /* ioctl r/o */
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loEncrypt_type uint32
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loEncrypt_key_size uint32 /* ioctl w/o */
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loFlags uint32 /* ioctl r/o */
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loFileName [LoNameSize]uint8
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loCryptName [LoNameSize]uint8
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loEncryptKey [LoKeySize]uint8 /* ioctl w/o */
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loInit [2]uint64
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}
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)
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// IOCTL consts
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const (
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BlkGetSize64 = C.BLKGETSIZE64
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LoopSetFd = C.LOOP_SET_FD
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LoopCtlGetFree = C.LOOP_CTL_GET_FREE
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LoopGetStatus64 = C.LOOP_GET_STATUS64
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LoopSetStatus64 = C.LOOP_SET_STATUS64
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LoopClrFd = C.LOOP_CLR_FD
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LoopSetCapacity = C.LOOP_SET_CAPACITY
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)
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const (
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LoFlagsAutoClear = C.LO_FLAGS_AUTOCLEAR
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LoFlagsReadOnly = C.LO_FLAGS_READ_ONLY
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LoFlagsPartScan = C.LO_FLAGS_PARTSCAN
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LoKeySize = C.LO_KEY_SIZE
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LoNameSize = C.LO_NAME_SIZE
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)
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var (
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DmGetLibraryVersion = dmGetLibraryVersionFct
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DmGetNextTarget = dmGetNextTargetFct
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DmLogInitVerbose = dmLogInitVerboseFct
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DmSetDevDir = dmSetDevDirFct
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DmTaskAddTarget = dmTaskAddTargetFct
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DmTaskCreate = dmTaskCreateFct
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DmTaskDestroy = dmTaskDestroyFct
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DmTaskGetInfo = dmTaskGetInfoFct
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DmTaskRun = dmTaskRunFct
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DmTaskSetAddNode = dmTaskSetAddNodeFct
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DmTaskSetCookie = dmTaskSetCookieFct
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DmTaskSetMessage = dmTaskSetMessageFct
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DmTaskSetName = dmTaskSetNameFct
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DmTaskSetRo = dmTaskSetRoFct
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DmTaskSetSector = dmTaskSetSectorFct
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DmUdevWait = dmUdevWaitFct
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LogWithErrnoInit = logWithErrnoInitFct
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)
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func free(p *C.char) {
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C.free(unsafe.Pointer(p))
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}
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func dmTaskDestroyFct(task *CDmTask) {
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C.dm_task_destroy((*C.struct_dm_task)(task))
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}
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func dmTaskCreateFct(taskType int) *CDmTask {
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return (*CDmTask)(C.dm_task_create(C.int(taskType)))
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}
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func dmTaskRunFct(task *CDmTask) int {
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ret, _ := C.dm_task_run((*C.struct_dm_task)(task))
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return int(ret)
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}
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func dmTaskSetNameFct(task *CDmTask, name string) int {
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Cname := C.CString(name)
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defer free(Cname)
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return int(C.dm_task_set_name((*C.struct_dm_task)(task), Cname))
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}
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func dmTaskSetMessageFct(task *CDmTask, message string) int {
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Cmessage := C.CString(message)
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defer free(Cmessage)
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return int(C.dm_task_set_message((*C.struct_dm_task)(task), Cmessage))
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}
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func dmTaskSetSectorFct(task *CDmTask, sector uint64) int {
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return int(C.dm_task_set_sector((*C.struct_dm_task)(task), C.uint64_t(sector)))
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}
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func dmTaskSetCookieFct(task *CDmTask, cookie *uint, flags uint16) int {
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cCookie := C.uint32_t(*cookie)
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defer func() {
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*cookie = uint(cCookie)
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}()
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return int(C.dm_task_set_cookie((*C.struct_dm_task)(task), &cCookie, C.uint16_t(flags)))
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}
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func dmTaskSetAddNodeFct(task *CDmTask, addNode AddNodeType) int {
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return int(C.dm_task_set_add_node((*C.struct_dm_task)(task), C.dm_add_node_t(addNode)))
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}
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func dmTaskSetRoFct(task *CDmTask) int {
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return int(C.dm_task_set_ro((*C.struct_dm_task)(task)))
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}
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func dmTaskAddTargetFct(task *CDmTask,
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start, size uint64, ttype, params string) int {
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Cttype := C.CString(ttype)
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defer free(Cttype)
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Cparams := C.CString(params)
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defer free(Cparams)
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return int(C.dm_task_add_target((*C.struct_dm_task)(task), C.uint64_t(start), C.uint64_t(size), Cttype, Cparams))
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}
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func dmTaskGetInfoFct(task *CDmTask, info *Info) int {
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Cinfo := C.struct_dm_info{}
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defer func() {
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info.Exists = int(Cinfo.exists)
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info.Suspended = int(Cinfo.suspended)
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info.LiveTable = int(Cinfo.live_table)
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info.InactiveTable = int(Cinfo.inactive_table)
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info.OpenCount = int32(Cinfo.open_count)
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info.EventNr = uint32(Cinfo.event_nr)
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info.Major = uint32(Cinfo.major)
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info.Minor = uint32(Cinfo.minor)
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info.ReadOnly = int(Cinfo.read_only)
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info.TargetCount = int32(Cinfo.target_count)
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}()
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return int(C.dm_task_get_info((*C.struct_dm_task)(task), &Cinfo))
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}
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func dmGetNextTargetFct(task *CDmTask, next uintptr, start, length *uint64, target, params *string) uintptr {
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var (
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Cstart, Clength C.uint64_t
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CtargetType, Cparams *C.char
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)
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defer func() {
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*start = uint64(Cstart)
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*length = uint64(Clength)
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*target = C.GoString(CtargetType)
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*params = C.GoString(Cparams)
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}()
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nextp := C.dm_get_next_target((*C.struct_dm_task)(task), unsafe.Pointer(next), &Cstart, &Clength, &CtargetType, &Cparams)
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return uintptr(nextp)
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}
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func dmUdevWaitFct(cookie uint) int {
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return int(C.dm_udev_wait(C.uint32_t(cookie)))
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}
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func dmLogInitVerboseFct(level int) {
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C.dm_log_init_verbose(C.int(level))
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}
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func logWithErrnoInitFct() {
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C.log_with_errno_init()
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}
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func dmSetDevDirFct(dir string) int {
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Cdir := C.CString(dir)
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defer free(Cdir)
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return int(C.dm_set_dev_dir(Cdir))
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}
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func dmGetLibraryVersionFct(version *string) int {
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buffer := C.CString(string(make([]byte, 128)))
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defer free(buffer)
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defer func() {
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*version = C.GoString(buffer)
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}()
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return int(C.dm_get_library_version(buffer, 128))
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}
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