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loopback: separate loop logic from devicemapper

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The loopback logic is not technically exclusive to the devicemapper
driver. This reorganizes the code such that the loopback code is usable
outside of the devicemapper package and driver.

Signed-off-by: Vincent Batts <vbatts@redhat.com>
This commit is contained in:
Vincent Batts 2015-12-14 17:16:34 -05:00
parent c28b794f70
commit 74e35aace0
7 changed files with 200 additions and 165 deletions
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41
devicemapper/devmapper_wrapper.go
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@ -5,17 +5,8 @@ package devicemapper
/*
#cgo LDFLAGS: -L. -ldevmapper
#include <libdevmapper.h>
#include <linux/loop.h> // FIXME: present only for defines, maybe we can remove it?
#include <linux/fs.h> // FIXME: present only for BLKGETSIZE64, maybe we can remove it?
#ifndef LOOP_CTL_GET_FREE
#define LOOP_CTL_GET_FREE 0x4C82
#endif
#ifndef LO_FLAGS_PARTSCAN
#define LO_FLAGS_PARTSCAN 8
#endif
// FIXME: Can't we find a way to do the logging in pure Go?
extern void DevmapperLogCallback(int level, char *file, int line, int dm_errno_or_class, char *str);
@ -45,44 +36,12 @@ import (
type (
cdmTask C.struct_dm_task
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 */
loEncryptType uint32
loEncryptKeySize uint32 /* ioctl w/o */
loFlags uint32 /* ioctl r/o */
loFileName [LoNameSize]uint8
loCryptName [LoNameSize]uint8
loEncryptKey [LoKeySize]uint8 /* ioctl w/o */
loInit [2]uint64
}
)
// IOCTL consts
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
)
// LOOP consts.
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
)
// Devicemapper cookie flags.