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Move device mapper code from pmem to devicemapper package. Signed-off-by: Maksim An <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| // +build linux | ||
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| package devicemapper | ||
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| import ( | ||
| "context" | ||
| "fmt" | ||
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| "github.com/pkg/errors" | ||
| "go.opencensus.io/trace" | ||
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| "github.com/Microsoft/hcsshim/internal/guest/prot" | ||
| "github.com/Microsoft/hcsshim/internal/oc" | ||
| ) | ||
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| // CreateZeroSectorLinearTarget creates dm-linear target for a device at `devPath` and `mappingInfo`, returns | ||
| // virtual block device path. | ||
| func CreateZeroSectorLinearTarget(ctx context.Context, devPath, devName string, mappingInfo *prot.DeviceMappingInfo) (_ string, err error) { | ||
| _, span := trace.StartSpan(ctx, "devicemapper::CreateZeroSectorLinearTarget") | ||
| defer span.End() | ||
| defer func() { oc.SetSpanStatus(span, err) }() | ||
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| linearTarget := zeroSectorLinearTarget(mappingInfo.DeviceSizeInBytes, devPath, mappingInfo.DeviceOffsetInBytes) | ||
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| span.AddAttributes( | ||
| trace.StringAttribute("devicePath", devPath), | ||
| trace.Int64Attribute("deviceStart", mappingInfo.DeviceOffsetInBytes), | ||
| trace.Int64Attribute("sectorSize", mappingInfo.DeviceSizeInBytes), | ||
| trace.StringAttribute("linearTable", fmt.Sprintf("%s: '%d %d %s'", devName, linearTarget.SectorStart, linearTarget.LengthInBlocks, linearTarget.Params))) | ||
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| devMapperPath, err := CreateDevice(devName, CreateReadOnly, []Target{linearTarget}) | ||
| if err != nil { | ||
| return "", errors.Wrapf(err, "failed to create dm-linear target, device=%s, offset=%d", devPath, mappingInfo.DeviceOffsetInBytes) | ||
| } | ||
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| return devMapperPath, nil | ||
| } | ||
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| // CreateVerityTarget creates a dm-verity target for a given device and returns created virtual block device path. | ||
| // | ||
| // Example verity target table: | ||
| // 0 417792 verity 1 /dev/sdb /dev/sdc 4096 4096 52224 1 sha256 2aa4f7b7b6...f4952060e8 762307f4bc8...d2a6b7595d8.. | ||
| // | | | | | | | | | | | | | | ||
| // start| | | data_dev | data_block | #blocks | hash_alg root_digest salt | ||
| // size | version hash_dev | hash_offset | ||
| // target hash_block | ||
| func CreateVerityTarget(ctx context.Context, devPath, devName string, verityInfo *prot.DeviceVerityInfo) (_ string, err error) { | ||
| _, span := trace.StartSpan(ctx, "devicemapper::CreateVerityTarget") | ||
| defer span.End() | ||
| defer func() { oc.SetSpanStatus(span, err) }() | ||
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| dmBlocks := verityInfo.Ext4SizeInBytes / blockSize | ||
| dataBlocks := verityInfo.Ext4SizeInBytes / int64(verityInfo.BlockSize) | ||
| hashOffsetBlocks := dataBlocks | ||
| if verityInfo.SuperBlock { | ||
| hashOffsetBlocks++ | ||
| } | ||
| hashes := fmt.Sprintf("%s %s %s", verityInfo.Algorithm, verityInfo.RootDigest, verityInfo.Salt) | ||
| blkInfo := fmt.Sprintf("%d %d %d %d", verityInfo.BlockSize, verityInfo.BlockSize, dataBlocks, hashOffsetBlocks) | ||
| devices := fmt.Sprintf("%s %s", devPath, devPath) | ||
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| verityTarget := Target{ | ||
| SectorStart: 0, | ||
| LengthInBlocks: dmBlocks, | ||
| Type: "verity", | ||
| Params: fmt.Sprintf("%d %s %s %s", verityInfo.Version, devices, blkInfo, hashes), | ||
| } | ||
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| span.AddAttributes( | ||
| trace.StringAttribute("devicePath", devPath), | ||
| trace.Int64Attribute("sectorSize", dmBlocks), | ||
| trace.StringAttribute("verityTable", verityTarget.Params)) | ||
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| mapperPath, err := CreateDevice(devName, CreateReadOnly, []Target{verityTarget}) | ||
| if err != nil { | ||
| return "", errors.Wrapf(err, "failed to create dm-verity target. device=%s", devPath) | ||
| } | ||
|
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| return mapperPath, nil | ||
| } |
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