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Move attach loop device to its own file

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This commit is contained in:
Guillaume J. Charmes
2013-11-27 17:12:57 -08:00
parent 74c8f7af75
commit eb528b959e
3 changed files with 208 additions and 137 deletions
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graphdriver/devmapper/devmapper_wrapper.go
+30 -30
View File
@@ -33,7 +33,23 @@ import (
)
type (
CDmTask C.struct_dm_task
CDmTask C.struct_dm_task
CLoopInfo64 C.struct_loop_info64
LoopInfo64 struct {
loDevice uint64 /* ioctl r/o */
loInode uint64 /* ioctl r/o */
loRdevice uint64 /* ioctl r/o */
loOffset uint64
loSizelimit uint64 /* bytes, 0 == max available */
loNumber uint32 /* ioctl r/o */
loEncrypt_type uint32
loEncrypt_key_size uint32 /* ioctl w/o */
loFlags uint32 /* ioctl r/o */
loFileName [LoNameSize]uint8
loCryptName [LoNameSize]uint8
loEncryptKey [LoKeySize]uint8 /* ioctl w/o */
loInit [2]uint64
}
)
// FIXME: Make sure the values are defined in C
@@ -50,7 +66,6 @@ const (
)
var (
DmAttachLoopDevice = dmAttachLoopDeviceFct
DmGetBlockSize = dmGetBlockSizeFct
DmGetLibraryVersion = dmGetLibraryVersionFct
DmGetNextTarget = dmGetNextTargetFct
@@ -137,23 +152,6 @@ func dmTaskAddTargetFct(task *CDmTask,
return int(C.dm_task_add_target((*C.struct_dm_task)(task), C.uint64_t(start), C.uint64_t(size), Cttype, Cparams))
}
func dmGetLoopbackBackingFileFct(fd uintptr) (uint64, uint64, sysErrno) {
var lo64 C.struct_loop_info64
_, _, err := sysSyscall(sysSysIoctl, fd, C.LOOP_GET_STATUS64, uintptr(unsafe.Pointer(&lo64)))
return uint64(lo64.lo_device), uint64(lo64.lo_inode), sysErrno(err)
}
func dmLoopbackSetCapacityFct(fd uintptr) sysErrno {
_, _, err := sysSyscall(sysSysIoctl, fd, C.LOOP_SET_CAPACITY, 0)
return sysErrno(err)
}
func dmGetBlockSizeFct(fd uintptr) (int64, sysErrno) {
var size int64
_, _, err := sysSyscall(sysSysIoctl, fd, C.BLKGETSIZE64, uintptr(unsafe.Pointer(&size)))
return size, sysErrno(err)
}
func dmTaskGetInfoFct(task *CDmTask, info *Info) int {
Cinfo := C.struct_dm_info{}
defer func() {
@@ -187,19 +185,21 @@ func dmGetNextTargetFct(task *CDmTask, next uintptr, start, length *uint64, targ
return uintptr(nextp)
}
func dmAttachLoopDeviceFct(filename string, fd *int) string {
return ""
// cFilename := C.CString(filename)
// defer free(cFilename)
func dmGetLoopbackBackingFileFct(fd uintptr) (uint64, uint64, sysErrno) {
var lo64 C.struct_loop_info64
_, _, err := sysSyscall(sysSysIoctl, fd, C.LOOP_GET_STATUS64, uintptr(unsafe.Pointer(&lo64)))
return uint64(lo64.lo_device), uint64(lo64.lo_inode), sysErrno(err)
}
// var cFd C.int
// defer func() {
// *fd = int(cFd)
// }()
func dmLoopbackSetCapacityFct(fd uintptr) sysErrno {
_, _, err := sysSyscall(sysSysIoctl, fd, C.LOOP_SET_CAPACITY, 0)
return sysErrno(err)
}
// ret := C.attach_loop_device(cFilename, &cFd)
// defer free(ret)
// return C.GoString(ret)
func dmGetBlockSizeFct(fd uintptr) (int64, sysErrno) {
var size int64
_, _, err := sysSyscall(sysSysIoctl, fd, C.BLKGETSIZE64, uintptr(unsafe.Pointer(&size)))
return size, sysErrno(err)
}
func getBlockSizeFct(fd uintptr, size *uint64) sysErrno {