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remove deprecated devicemapper storage-driver

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Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn 2022-05-24 17:17:08 +02:00
parent 81359cecdf
commit dc11d2a2d8
No known key found for this signature in database
GPG key ID: 76698F39D527CE8C
59 changed files with 33 additions and 5597 deletions
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1
.github/CODEOWNERS vendored
View file

@ -5,7 +5,6 @@
builder/** @tonistiigi
contrib/mkimage/** @tianon
daemon/graphdriver/devmapper/** @rhvgoyal
daemon/graphdriver/overlay2/** @dmcgowan
daemon/graphdriver/windows/** @johnstep
daemon/logger/awslogs/** @samuelkarp

2
Makefile
View file

@ -28,7 +28,7 @@ export VALIDATE_ORIGIN_BRANCH
# option of "go build". For example, a built-in graphdriver priority list
# can be changed during build time like this:
#
# make DOCKER_LDFLAGS="-X github.com/docker/docker/daemon/graphdriver.priority=overlay2,devicemapper" dynbinary
# make DOCKER_LDFLAGS="-X github.com/docker/docker/daemon/graphdriver.priority=overlay2,zfs" dynbinary
#
DOCKER_ENVS := \
-e BUILD_APT_MIRROR \

2
api/swagger.yaml
View file

@ -6561,7 +6561,7 @@ paths:
StopSignal: "SIGTERM"
StopTimeout: 10
Created: "2015-01-06T15:47:31.485331387Z"
Driver: "devicemapper"
Driver: "overlay2"
ExecIDs:
- "b35395de42bc8abd327f9dd65d913b9ba28c74d2f0734eeeae84fa1c616a0fca"
- "3fc1232e5cd20c8de182ed81178503dc6437f4e7ef12b52cc5e8de020652f1c4"

5
contrib/check-config.sh
View file

@ -374,11 +374,6 @@ check_flags BTRFS_FS_POSIX_ACL | sed 's/^/ /'
[ "$EXITCODE" = 0 ] && STORAGE=0
EXITCODE=0
echo " - \"$(wrap_color 'devicemapper' blue)\":"
check_flags BLK_DEV_DM DM_THIN_PROVISIONING | sed 's/^/ /'
[ "$EXITCODE" = 0 ] && STORAGE=0
EXITCODE=0
echo " - \"$(wrap_color 'overlay' blue)\":"
check_flags OVERLAY_FS | sed 's/^/ /'
[ "$EXITCODE" = 0 ] && STORAGE=0

14
contrib/docker-device-tool/README.md
View file

@ -1,14 +0,0 @@
Docker device tool for devicemapper storage driver backend
===================
The ./contrib/docker-device-tool contains a tool to manipulate devicemapper thin-pool.
Compile
========
$ make shell
## inside build container
$ go build contrib/docker-device-tool/device_tool.go
# if devicemapper version is old and compilation fails, compile with `libdm_no_deferred_remove` tag
$ go build -tags libdm_no_deferred_remove contrib/docker-device-tool/device_tool.go

169
contrib/docker-device-tool/device_tool.go
View file

@ -1,169 +0,0 @@
//go:build !windows
// +build !windows
package main
import (
"flag"
"fmt"
"os"
"path"
"sort"
"strconv"
"strings"
"github.com/docker/docker/daemon/graphdriver/devmapper"
"github.com/docker/docker/pkg/devicemapper"
"github.com/docker/docker/pkg/idtools"
"github.com/sirupsen/logrus"
)
func usage() {
fmt.Fprintf(os.Stderr, "Usage: %s <flags> [status] | [list] | [device id] | [resize new-pool-size] | [snap new-id base-id] | [remove id] | [mount id mountpoint]\n", os.Args[0])
flag.PrintDefaults()
os.Exit(1)
}
func byteSizeFromString(arg string) (int64, error) {
digits := ""
rest := ""
last := strings.LastIndexAny(arg, "0123456789")
if last >= 0 {
digits = arg[:last+1]
rest = arg[last+1:]
}
val, err := strconv.ParseInt(digits, 10, 64)
if err != nil {
return val, err
}
rest = strings.ToLower(strings.TrimSpace(rest))
var multiplier int64
switch rest {
case "":
multiplier = 1
case "k", "kb":
multiplier = 1024
case "m", "mb":
multiplier = 1024 * 1024
case "g", "gb":
multiplier = 1024 * 1024 * 1024
case "t", "tb":
multiplier = 1024 * 1024 * 1024 * 1024
default:
return 0, fmt.Errorf("Unknown size unit: %s", rest)
}
return val * multiplier, nil
}
func main() {
root := flag.String("r", "/var/lib/docker", "Docker root dir")
flDebug := flag.Bool("D", false, "Debug mode")
flag.Parse()
if *flDebug {
os.Setenv("DEBUG", "1")
logrus.SetLevel(logrus.DebugLevel)
}
if flag.NArg() < 1 {
usage()
}
args := flag.Args()
home := path.Join(*root, "devicemapper")
devices, err := devmapper.NewDeviceSet(home, false, nil, idtools.IdentityMapping{})
if err != nil {
fmt.Println("Can't initialize device mapper: ", err)
os.Exit(1)
}
switch args[0] {
case "status":
status := devices.Status()
fmt.Printf("Pool name: %s\n", status.PoolName)
fmt.Printf("Data Loopback file: %s\n", status.DataLoopback)
fmt.Printf("Metadata Loopback file: %s\n", status.MetadataLoopback)
fmt.Printf("Sector size: %d\n", status.SectorSize)
fmt.Printf("Data use: %d of %d (%.1f %%)\n", status.Data.Used, status.Data.Total, 100.0*float64(status.Data.Used)/float64(status.Data.Total))
fmt.Printf("Metadata use: %d of %d (%.1f %%)\n", status.Metadata.Used, status.Metadata.Total, 100.0*float64(status.Metadata.Used)/float64(status.Metadata.Total))
case "list":
ids := devices.List()
sort.Strings(ids)
for _, id := range ids {
fmt.Println(id)
}
case "device":
if flag.NArg() < 2 {
usage()
}
status, err := devices.GetDeviceStatus(args[1])
if err != nil {
fmt.Println("Can't get device info: ", err)
os.Exit(1)
}
fmt.Printf("Id: %d\n", status.DeviceID)
fmt.Printf("Size: %d\n", status.Size)
fmt.Printf("Transaction Id: %d\n", status.TransactionID)
fmt.Printf("Size in Sectors: %d\n", status.SizeInSectors)
fmt.Printf("Mapped Sectors: %d\n", status.MappedSectors)
fmt.Printf("Highest Mapped Sector: %d\n", status.HighestMappedSector)
case "resize":
if flag.NArg() < 2 {
usage()
}
size, err := byteSizeFromString(args[1])
if err != nil {
fmt.Println("Invalid size: ", err)
os.Exit(1)
}
err = devices.ResizePool(size)
if err != nil {
fmt.Println("Error resizing pool: ", err)
os.Exit(1)
}
case "snap":
if flag.NArg() < 3 {
usage()
}
err := devices.AddDevice(args[1], args[2], nil)
if err != nil {
fmt.Println("Can't create snap device: ", err)
os.Exit(1)
}
case "remove":
if flag.NArg() < 2 {
usage()
}
err := devicemapper.RemoveDevice(args[1])
if err != nil {
fmt.Println("Can't remove device: ", err)
os.Exit(1)
}
case "mount":
if flag.NArg() < 3 {
usage()
}
err := devices.MountDevice(args[1], args[2], "")
if err != nil {
fmt.Println("Can't mount device: ", err)
os.Exit(1)
}
default:
fmt.Printf("Unknown command %s\n", args[0])
usage()
os.Exit(1)
}
}

4
contrib/docker-device-tool/device_tool_windows.go
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@ -1,4 +0,0 @@
package main
func main() {
}

98
daemon/graphdriver/devmapper/README.md
View file

@ -1,98 +0,0 @@
# devicemapper - a storage backend based on Device Mapper
## Theory of operation
The device mapper graphdriver uses the device mapper thin provisioning
module (dm-thinp) to implement CoW snapshots. The preferred model is
to have a thin pool reserved outside of Docker and passed to the
daemon via the `--storage-opt dm.thinpooldev` option. Alternatively,
the device mapper graphdriver can setup a block device to handle this
for you via the `--storage-opt dm.directlvm_device` option.
As a fallback if no thin pool is provided, loopback files will be
created. Loopback is very slow, but can be used without any
pre-configuration of storage. It is strongly recommended that you do
not use loopback in production. Ensure your Docker daemon has a
`--storage-opt dm.thinpooldev` argument provided.
In loopback, a thin pool is created at `/var/lib/docker/devicemapper`
(devicemapper graph location) based on two block devices, one for
data and one for metadata. By default these block devices are created
automatically by using loopback mounts of automatically created sparse
files.
The default loopback files used are
`/var/lib/docker/devicemapper/devicemapper/data` and
`/var/lib/docker/devicemapper/devicemapper/metadata`. Additional metadata
required to map from docker entities to the corresponding devicemapper
volumes is stored in the `/var/lib/docker/devicemapper/devicemapper/json`
file (encoded as Json).
In order to support multiple devicemapper graphs on a system, the thin
pool will be named something like: `docker-0:33-19478248-pool`, where
the `0:33` part is the minor/major device nr and `19478248` is the
inode number of the `/var/lib/docker/devicemapper` directory.
On the thin pool, docker automatically creates a base thin device,
called something like `docker-0:33-19478248-base` of a fixed
size. This is automatically formatted with an empty filesystem on
creation. This device is the base of all docker images and
containers. All base images are snapshots of this device and those
images are then in turn used as snapshots for other images and
eventually containers.
## Information on `docker info`
As of docker-1.4.1, `docker info` when using the `devicemapper` storage driver
will display something like:
$ sudo docker info
[...]
Storage Driver: devicemapper
Pool Name: docker-253:1-17538953-pool
Pool Blocksize: 65.54 kB
Base Device Size: 107.4 GB
Data file: /dev/loop4
Metadata file: /dev/loop4
Data Space Used: 2.536 GB
Data Space Total: 107.4 GB
Data Space Available: 104.8 GB
Metadata Space Used: 7.93 MB
Metadata Space Total: 2.147 GB
Metadata Space Available: 2.14 GB
Udev Sync Supported: true
Data loop file: /home/docker/devicemapper/devicemapper/data
Metadata loop file: /home/docker/devicemapper/devicemapper/metadata
Library Version: 1.02.82-git (2013-10-04)
[...]
### status items
Each item in the indented section under `Storage Driver: devicemapper` are
status information about the driver.
* `Pool Name` name of the devicemapper pool for this driver.
* `Pool Blocksize` tells the blocksize the thin pool was initialized with. This only changes on creation.
* `Base Device Size` tells the maximum size of a container and image
* `Data file` blockdevice file used for the devicemapper data
* `Metadata file` blockdevice file used for the devicemapper metadata
* `Data Space Used` tells how much of `Data file` is currently used
* `Data Space Total` tells max size the `Data file`
* `Data Space Available` tells how much free space there is in the `Data file`. If you are using a loop device this will report the actual space available to the loop device on the underlying filesystem.
* `Metadata Space Used` tells how much of `Metadata file` is currently used
* `Metadata Space Total` tells max size the `Metadata file`
* `Metadata Space Available` tells how much free space there is in the `Metadata file`. If you are using a loop device this will report the actual space available to the loop device on the underlying filesystem.
* `Udev Sync Supported` tells whether devicemapper is able to sync with Udev. Should be `true`.
* `Data loop file` file attached to `Data file`, if loopback device is used
* `Metadata loop file` file attached to `Metadata file`, if loopback device is used
* `Library Version` from the libdevmapper used
## About the devicemapper options
The devicemapper backend supports some options that you can specify
when starting the docker daemon using the `--storage-opt` flags.
This uses the `dm` prefix and would be used something like `dockerd --storage-opt dm.foo=bar`.
These options are currently documented both in [the man
page](../../../man/docker.1.md) and in [the online
documentation](https://docs.docker.com/engine/reference/commandline/dockerd/#/storage-driver-options).
If you add an options, update both the `man` page and the documentation.

230
daemon/graphdriver/devmapper/device_setup.go
View file

@ -1,230 +0,0 @@
package devmapper // import "github.com/docker/docker/daemon/graphdriver/devmapper"
import (
"bufio"
"bytes"
"encoding/json"
"fmt"
"os"
"os/exec"
"path/filepath"
"reflect"
"strings"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
type directLVMConfig struct {
Device string
ThinpPercent uint64
ThinpMetaPercent uint64
AutoExtendPercent uint64
AutoExtendThreshold uint64
}
var (
errThinpPercentMissing = errors.New("must set both `dm.thinp_percent` and `dm.thinp_metapercent` if either is specified")
errThinpPercentTooBig = errors.New("combined `dm.thinp_percent` and `dm.thinp_metapercent` must not be greater than 100")
errMissingSetupDevice = errors.New("must provide device path in `dm.directlvm_device` in order to configure direct-lvm")
)
func validateLVMConfig(cfg directLVMConfig) error {
if reflect.DeepEqual(cfg, directLVMConfig{}) {
return nil
}
if cfg.Device == "" {
return errMissingSetupDevice
}
if (cfg.ThinpPercent > 0 && cfg.ThinpMetaPercent == 0) || cfg.ThinpMetaPercent > 0 && cfg.ThinpPercent == 0 {
return errThinpPercentMissing
}
if cfg.ThinpPercent+cfg.ThinpMetaPercent > 100 {
return errThinpPercentTooBig
}
return nil
}
func checkDevAvailable(dev string) error {
lvmScan, err := exec.LookPath("lvmdiskscan")
if err != nil {
logrus.Debug("could not find lvmdiskscan")
return nil
}
out, err := exec.Command(lvmScan).CombinedOutput()
if err != nil {
logrus.WithError(err).Error(string(out))
return nil
}
if !bytes.Contains(out, []byte(dev)) {
return errors.Errorf("%s is not available for use with devicemapper", dev)
}
return nil
}
func checkDevInVG(dev string) error {
pvDisplay, err := exec.LookPath("pvdisplay")
if err != nil {
logrus.Debug("could not find pvdisplay")
return nil
}
out, err := exec.Command(pvDisplay, dev).CombinedOutput()
if err != nil {
logrus.WithError(err).Error(string(out))
return nil
}
scanner := bufio.NewScanner(bytes.NewReader(bytes.TrimSpace(out)))
for scanner.Scan() {
fields := strings.SplitAfter(strings.TrimSpace(scanner.Text()), "VG Name")
if len(fields) > 1 {
// got "VG Name" line"
vg := strings.TrimSpace(fields[1])
if len(vg) > 0 {
return errors.Errorf("%s is already part of a volume group %q: must remove this device from any volume group or provide a different device", dev, vg)
}
logrus.Error(fields)
break
}
}
return nil
}
func checkDevHasFS(dev string) error {
blkid, err := exec.LookPath("blkid")
if err != nil {
logrus.Debug("could not find blkid")
return nil
}
out, err := exec.Command(blkid, dev).CombinedOutput()
if err != nil {
logrus.WithError(err).Error(string(out))
return nil
}
fields := bytes.Fields(out)
for _, f := range fields {
kv := bytes.Split(f, []byte{'='})
if bytes.Equal(kv[0], []byte("TYPE")) {
v := bytes.Trim(kv[1], "\"")
if len(v) > 0 {
return errors.Errorf("%s has a filesystem already, use dm.directlvm_device_force=true if you want to wipe the device", dev)
}
return nil
}
}
return nil
}
func verifyBlockDevice(dev string, force bool) error {
if err := checkDevAvailable(dev); err != nil {
return err
}
if err := checkDevInVG(dev); err != nil {
return err
}
if force {
return nil
}
return checkDevHasFS(dev)
}
func readLVMConfig(root string) (directLVMConfig, error) {
var cfg directLVMConfig
p := filepath.Join(root, "setup-config.json")
b, err := os.ReadFile(p)
if err != nil {
if os.IsNotExist(err) {
return cfg, nil
}
return cfg, errors.Wrap(err, "error reading existing setup config")
}
// check if this is just an empty file, no need to produce a json error later if so
if len(b) == 0 {
return cfg, nil
}
err = json.Unmarshal(b, &cfg)
return cfg, errors.Wrap(err, "error unmarshaling previous device setup config")
}
func writeLVMConfig(root string, cfg directLVMConfig) error {
p := filepath.Join(root, "setup-config.json")
b, err := json.Marshal(cfg)
if err != nil {
return errors.Wrap(err, "error marshalling direct lvm config")
}
err = os.WriteFile(p, b, 0600)
return errors.Wrap(err, "error writing direct lvm config to file")
}
func setupDirectLVM(cfg directLVMConfig) error {
lvmProfileDir := "/etc/lvm/profile"
binaries := []string{"pvcreate", "vgcreate", "lvcreate", "lvconvert", "lvchange", "thin_check"}
for _, bin := range binaries {
if _, err := exec.LookPath(bin); err != nil {
return errors.Wrap(err, "error looking up command `"+bin+"` while setting up direct lvm")
}
}
err := os.MkdirAll(lvmProfileDir, 0755)
if err != nil {
return errors.Wrap(err, "error creating lvm profile directory")
}
if cfg.AutoExtendPercent == 0 {
cfg.AutoExtendPercent = 20
}
if cfg.AutoExtendThreshold == 0 {
cfg.AutoExtendThreshold = 80
}
if cfg.ThinpPercent == 0 {
cfg.ThinpPercent = 95
}
if cfg.ThinpMetaPercent == 0 {
cfg.ThinpMetaPercent = 1
}
out, err := exec.Command("pvcreate", "-f", cfg.Device).CombinedOutput()
if err != nil {
return errors.Wrap(err, string(out))
}
out, err = exec.Command("vgcreate", "docker", cfg.Device).CombinedOutput()
if err != nil {
return errors.Wrap(err, string(out))
}
out, err = exec.Command("lvcreate", "--wipesignatures", "y", "-n", "thinpool", "docker", "--extents", fmt.Sprintf("%d%%VG", cfg.ThinpPercent)).CombinedOutput()
if err != nil {
return errors.Wrap(err, string(out))
}
out, err = exec.Command("lvcreate", "--wipesignatures", "y", "-n", "thinpoolmeta", "docker", "--extents", fmt.Sprintf("%d%%VG", cfg.ThinpMetaPercent)).CombinedOutput()
if err != nil {
return errors.Wrap(err, string(out))
}
out, err = exec.Command("lvconvert", "-y", "--zero", "n", "-c", "512K", "--thinpool", "docker/thinpool", "--poolmetadata", "docker/thinpoolmeta").CombinedOutput()
if err != nil {
return errors.Wrap(err, string(out))
}
profile := fmt.Sprintf("activation{\nthin_pool_autoextend_threshold=%d\nthin_pool_autoextend_percent=%d\n}", cfg.AutoExtendThreshold, cfg.AutoExtendPercent)
err = os.WriteFile(lvmProfileDir+"/docker-thinpool.profile", []byte(profile), 0600)
if err != nil {
return errors.Wrap(err, "error writing docker thinp autoextend profile")
}
out, err = exec.Command("lvchange", "--metadataprofile", "docker-thinpool", "docker/thinpool").CombinedOutput()
return errors.Wrap(err, string(out))
}

2811
daemon/graphdriver/devmapper/deviceset.go
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File diff suppressed because it is too large Load diff

106
daemon/graphdriver/devmapper/devmapper_doc.go
View file

@ -1,106 +0,0 @@
package devmapper // import "github.com/docker/docker/daemon/graphdriver/devmapper"
// Definition of struct dm_task and sub structures (from lvm2)
//
// struct dm_ioctl {
// /*
// * The version number is made up of three parts:
// * major - no backward or forward compatibility,
// * minor - only backwards compatible,
// * patch - both backwards and forwards compatible.
// *
// * All clients of the ioctl interface should fill in the
// * version number of the interface that they were
// * compiled with.
// *
// * All recognized ioctl commands (ie. those that don't
// * return -ENOTTY) fill out this field, even if the
// * command failed.
// */
// uint32_t version[3]; /* in/out */
// uint32_t data_size; /* total size of data passed in
// * including this struct */
// uint32_t data_start; /* offset to start of data
// * relative to start of this struct */
// uint32_t target_count; /* in/out */
// int32_t open_count; /* out */
// uint32_t flags; /* in/out */
// /*
// * event_nr holds either the event number (input and output) or the
// * udev cookie value (input only).
// * The DM_DEV_WAIT ioctl takes an event number as input.
// * The DM_SUSPEND, DM_DEV_REMOVE and DM_DEV_RENAME ioctls
// * use the field as a cookie to return in the DM_COOKIE
// * variable with the uevents they issue.
// * For output, the ioctls return the event number, not the cookie.
// */
// uint32_t event_nr; /* in/out */
// uint32_t padding;
// uint64_t dev; /* in/out */
// char name[DM_NAME_LEN]; /* device name */
// char uuid[DM_UUID_LEN]; /* unique identifier for
// * the block device */
// char data[7]; /* padding or data */
// };
// struct target {
// uint64_t start;
// uint64_t length;
// char *type;
// char *params;
// struct target *next;
// };
// typedef enum {
// DM_ADD_NODE_ON_RESUME, /* add /dev/mapper node with dmsetup resume */
// DM_ADD_NODE_ON_CREATE /* add /dev/mapper node with dmsetup create */
// } dm_add_node_t;
// struct dm_task {
// int type;
// char *dev_name;
// char *mangled_dev_name;
// struct target *head, *tail;
// int read_only;
// uint32_t event_nr;
// int major;
// int minor;
// int allow_default_major_fallback;
// uid_t uid;
// gid_t gid;
// mode_t mode;
// uint32_t read_ahead;
// uint32_t read_ahead_flags;
// union {
// struct dm_ioctl *v4;
// } dmi;
// char *newname;
// char *message;
// char *geometry;
// uint64_t sector;
// int no_flush;
// int no_open_count;
// int skip_lockfs;
// int query_inactive_table;
// int suppress_identical_reload;
// dm_add_node_t add_node;
// uint64_t existing_table_size;
// int cookie_set;
// int new_uuid;
// int secure_data;
// int retry_remove;
// int enable_checks;
// int expected_errno;
// char *uuid;
// char *mangled_uuid;
// };
//

208
daemon/graphdriver/devmapper/devmapper_test.go
View file

@ -1,208 +0,0 @@
//go:build linux
// +build linux
package devmapper // import "github.com/docker/docker/daemon/graphdriver/devmapper"
import (
"fmt"
"os"
"os/exec"
"syscall"
"testing"
"time"
"github.com/docker/docker/daemon/graphdriver"
"github.com/docker/docker/daemon/graphdriver/graphtest"
"github.com/docker/docker/pkg/idtools"
"github.com/docker/docker/pkg/parsers/kernel"
"golang.org/x/sys/unix"
)
func init() {
// Reduce the size of the base fs and loopback for the tests
defaultDataLoopbackSize = 300 * 1024 * 1024
defaultMetaDataLoopbackSize = 200 * 1024 * 1024
defaultBaseFsSize = 300 * 1024 * 1024
defaultUdevSyncOverride = true
if err := initLoopbacks(); err != nil {
panic(err)
}
}
// initLoopbacks ensures that the loopback devices are properly created within
// the system running the device mapper tests.
func initLoopbacks() error {
statT, err := getBaseLoopStats()
if err != nil {
return err
}
// create at least 128 loopback files, since a few first ones
// might be already in use by the host OS
for i := 0; i < 128; i++ {
loopPath := fmt.Sprintf("/dev/loop%d", i)
// only create new loopback files if they don't exist
if _, err := os.Stat(loopPath); err != nil {
if mkerr := syscall.Mknod(loopPath,
uint32(statT.Mode|syscall.S_IFBLK), int((7<<8)|(i&0xff)|((i&0xfff00)<<12))); mkerr != nil { //nolint: unconvert
return mkerr
}
os.Chown(loopPath, int(statT.Uid), int(statT.Gid))
}
}
return nil
}
// getBaseLoopStats inspects /dev/loop0 to collect uid,gid, and mode for the
// loop0 device on the system. If it does not exist we assume 0,0,0660 for the
// stat data
func getBaseLoopStats() (*syscall.Stat_t, error) {
loop0, err := os.Stat("/dev/loop0")
if err != nil {
if os.IsNotExist(err) {
return &syscall.Stat_t{
Uid: 0,
Gid: 0,
Mode: 0660,
}, nil
}
return nil, err
}
return loop0.Sys().(*syscall.Stat_t), nil
}
// This avoids creating a new driver for each test if all tests are run
// Make sure to put new tests between TestDevmapperSetup and TestDevmapperTeardown
func TestDevmapperSetup(t *testing.T) {
graphtest.GetDriver(t, "devicemapper")
}
func TestDevmapperCreateEmpty(t *testing.T) {
graphtest.DriverTestCreateEmpty(t, "devicemapper")
}
func TestDevmapperCreateBase(t *testing.T) {
graphtest.DriverTestCreateBase(t, "devicemapper")
}
func TestDevmapperCreateSnap(t *testing.T) {
graphtest.DriverTestCreateSnap(t, "devicemapper")
}
func TestDevmapperTeardown(t *testing.T) {
graphtest.PutDriver(t)
}
func TestDevmapperReduceLoopBackSize(t *testing.T) {
tenMB := int64(10 * 1024 * 1024)
testChangeLoopBackSize(t, -tenMB, defaultDataLoopbackSize, defaultMetaDataLoopbackSize)
}
func TestDevmapperIncreaseLoopBackSize(t *testing.T) {
tenMB := int64(10 * 1024 * 1024)
testChangeLoopBackSize(t, tenMB, defaultDataLoopbackSize+tenMB, defaultMetaDataLoopbackSize+tenMB)
}
func testChangeLoopBackSize(t *testing.T, delta, expectDataSize, expectMetaDataSize int64) {
driver := graphtest.GetDriver(t, "devicemapper").(*graphtest.Driver).Driver.(*graphdriver.NaiveDiffDriver).ProtoDriver.(*Driver)
defer graphtest.PutDriver(t)
// make sure data or metadata loopback size are the default size
if s := driver.DeviceSet.Status(); s.Data.Total != uint64(defaultDataLoopbackSize) || s.Metadata.Total != uint64(defaultMetaDataLoopbackSize) {
t.Fatal("data or metadata loop back size is incorrect")
}
if err := driver.Cleanup(); err != nil {
t.Fatal(err)
}
// Reload
d, err := Init(driver.home, []string{
fmt.Sprintf("dm.loopdatasize=%d", defaultDataLoopbackSize+delta),
fmt.Sprintf("dm.loopmetadatasize=%d", defaultMetaDataLoopbackSize+delta),
}, idtools.IdentityMapping{})
if err != nil {
t.Fatalf("error creating devicemapper driver: %v", err)
}
driver = d.(*graphdriver.NaiveDiffDriver).ProtoDriver.(*Driver)
if s := driver.DeviceSet.Status(); s.Data.Total != uint64(expectDataSize) || s.Metadata.Total != uint64(expectMetaDataSize) {
t.Fatal("data or metadata loop back size is incorrect")
}
if err := driver.Cleanup(); err != nil {
t.Fatal(err)
}
}
// Make sure devices.Lock() has been release upon return from cleanupDeletedDevices() function
func TestDevmapperLockReleasedDeviceDeletion(t *testing.T) {
driver := graphtest.GetDriver(t, "devicemapper").(*graphtest.Driver).Driver.(*graphdriver.NaiveDiffDriver).ProtoDriver.(*Driver)
defer graphtest.PutDriver(t)
// Call cleanupDeletedDevices() and after the call take and release
// DeviceSet Lock. If lock has not been released, this will hang.
driver.DeviceSet.cleanupDeletedDevices()
doneChan := make(chan bool, 1)
go func() {
driver.DeviceSet.Lock()
defer driver.DeviceSet.Unlock()
doneChan <- true
}()
select {
case <-time.After(time.Second * 5):
// Timer expired. That means lock was not released upon
// function return and we are deadlocked. Release lock
// here so that cleanup could succeed and fail the test.
driver.DeviceSet.Unlock()
t.Fatal("Could not acquire devices lock after call to cleanupDeletedDevices()")
case <-doneChan:
}
}
// Ensure that mounts aren't leakedriver. It's non-trivial for us to test the full
// reproducer of #34573 in a unit test, but we can at least make sure that a
// simple command run in a new namespace doesn't break things horribly.
func TestDevmapperMountLeaks(t *testing.T) {
if !kernel.CheckKernelVersion(3, 18, 0) {
t.Skipf("kernel version <3.18.0 and so is missing torvalds/linux@8ed936b5671bfb33d89bc60bdcc7cf0470ba52fe.")
}
driver := graphtest.GetDriver(t, "devicemapper", "dm.use_deferred_removal=false", "dm.use_deferred_deletion=false").(*graphtest.Driver).Driver.(*graphdriver.NaiveDiffDriver).ProtoDriver.(*Driver)
defer graphtest.PutDriver(t)
// We need to create a new (dummy) device.
if err := driver.Create("some-layer", "", nil); err != nil {
t.Fatalf("setting up some-layer: %v", err)
}
// Mount the device.
_, err := driver.Get("some-layer", "")
if err != nil {
t.Fatalf("mounting some-layer: %v", err)
}
// Create a new subprocess which will inherit our mountpoint, then
// intentionally leak it and stick around. We can't do this entirely within
// Go because forking and namespaces in Go are really not handled well at
// all.
cmd := exec.Cmd{
Path: "/bin/sh",
Args: []string{
"/bin/sh", "-c",
"mount --make-rprivate / && sleep 1000s",
},
SysProcAttr: &syscall.SysProcAttr{
Unshareflags: syscall.CLONE_NEWNS,
},
}
if err := cmd.Start(); err != nil {
t.Fatalf("starting sub-command: %v", err)
}
defer func() {
unix.Kill(cmd.Process.Pid, unix.SIGKILL)
cmd.Wait()
}()
// Now try to "drop" the device.
if err := driver.Put("some-layer"); err != nil {
t.Fatalf("unmounting some-layer: %v", err)
}
}

244
daemon/graphdriver/devmapper/driver.go
View file

@ -1,244 +0,0 @@
//go:build linux
// +build linux
package devmapper // import "github.com/docker/docker/daemon/graphdriver/devmapper"
import (
"fmt"
"os"
"path"
"strconv"
"github.com/docker/docker/daemon/graphdriver"
"github.com/docker/docker/pkg/devicemapper"
"github.com/docker/docker/pkg/idtools"
units "github.com/docker/go-units"
"github.com/moby/locker"
"github.com/moby/sys/mount"
"github.com/sirupsen/logrus"
"golang.org/x/sys/unix"
)
func init() {
graphdriver.Register("devicemapper", Init)
}
// Driver contains the device set mounted and the home directory
type Driver struct {
*DeviceSet
home string
ctr *graphdriver.RefCounter
locker *locker.Locker
}
// Init creates a driver with the given home and the set of options.
func Init(home string, options []string, idMap idtools.IdentityMapping) (graphdriver.Driver, error) {
deviceSet, err := NewDeviceSet(home, true, options, idMap)
if err != nil {
return nil, err
}
d := &Driver{
DeviceSet: deviceSet,
home: home,
ctr: graphdriver.NewRefCounter(graphdriver.NewDefaultChecker()),
locker: locker.New(),
}
return graphdriver.NewNaiveDiffDriver(d, d.idMap), nil
}
func (d *Driver) String() string {
return "devicemapper"
}
// Status returns the status about the driver in a printable format.
// Information returned contains Pool Name, Data File, Metadata file, disk usage by
// the data and metadata, etc.
func (d *Driver) Status() [][2]string {
s := d.DeviceSet.Status()
status := [][2]string{
{"Pool Name", s.PoolName},
{"Pool Blocksize", units.HumanSize(float64(s.SectorSize))},
{"Base Device Size", units.HumanSize(float64(s.BaseDeviceSize))},
{"Backing Filesystem", s.BaseDeviceFS},
{"Udev Sync Supported", fmt.Sprintf("%v", s.UdevSyncSupported)},
}
if len(s.DataFile) > 0 {
status = append(status, [2]string{"Data file", s.DataFile})
}
if len(s.MetadataFile) > 0 {
status = append(status, [2]string{"Metadata file", s.MetadataFile})
}
if len(s.DataLoopback) > 0 {
status = append(status, [2]string{"Data loop file", s.DataLoopback})
}
if len(s.MetadataLoopback) > 0 {
status = append(status, [2]string{"Metadata loop file", s.MetadataLoopback})
}
status = append(status, [][2]string{
{"Data Space Used", units.HumanSize(float64(s.Data.Used))},
{"Data Space Total", units.HumanSize(float64(s.Data.Total))},
{"Data Space Available", units.HumanSize(float64(s.Data.Available))},
{"Metadata Space Used", units.HumanSize(float64(s.Metadata.Used))},
{"Metadata Space Total", units.HumanSize(float64(s.Metadata.Total))},
{"Metadata Space Available", units.HumanSize(float64(s.Metadata.Available))},
{"Thin Pool Minimum Free Space", units.HumanSize(float64(s.MinFreeSpace))},
{"Deferred Removal Enabled", fmt.Sprintf("%v", s.DeferredRemoveEnabled)},
{"Deferred Deletion Enabled", fmt.Sprintf("%v", s.DeferredDeleteEnabled)},
{"Deferred Deleted Device Count", fmt.Sprintf("%v", s.DeferredDeletedDeviceCount)},
}...)
if vStr, err := devicemapper.GetLibraryVersion(); err == nil {
status = append(status, [2]string{"Library Version", vStr})
}
return status
}
// GetMetadata returns a map of information about the device.
func (d *Driver) GetMetadata(id string) (map[string]string, error) {
m, err := d.DeviceSet.exportDeviceMetadata(id)
if err != nil {
return nil, err
}
metadata := make(map[string]string)
metadata["DeviceId"] = strconv.Itoa(m.deviceID)
metadata["DeviceSize"] = strconv.FormatUint(m.deviceSize, 10)
metadata["DeviceName"] = m.deviceName
return metadata, nil
}
// Cleanup unmounts a device.
func (d *Driver) Cleanup() error {
err := d.DeviceSet.Shutdown(d.home)
umountErr := mount.RecursiveUnmount(d.home)
// in case we have two errors, prefer the one from Shutdown()
if err != nil {
return err
}
return umountErr
}
// CreateReadWrite creates a layer that is writable for use as a container
// file system.
func (d *Driver) CreateReadWrite(id, parent string, opts *graphdriver.CreateOpts) error {
return d.Create(id, parent, opts)
}
// Create adds a device with a given id and the parent.
func (d *Driver) Create(id, parent string, opts *graphdriver.CreateOpts) error {
var storageOpt map[string]string
if opts != nil {
storageOpt = opts.StorageOpt
}
return d.DeviceSet.AddDevice(id, parent, storageOpt)
}
// Remove removes a device with a given id, unmounts the filesystem, and removes the mount point.
func (d *Driver) Remove(id string) error {
d.locker.Lock(id)
defer d.locker.Unlock(id)
if !d.DeviceSet.HasDevice(id) {
// Consider removing a non-existing device a no-op
// This is useful to be able to progress on container removal
// if the underlying device has gone away due to earlier errors
return nil
}
// This assumes the device has been properly Get/Put:ed and thus is unmounted
if err := d.DeviceSet.DeleteDevice(id, false); err != nil {
return fmt.Errorf("failed to remove device %s: %v", id, err)
}
// Most probably the mount point is already removed on Put()
// (see DeviceSet.UnmountDevice()), but just in case it was not
// let's try to remove it here as well, ignoring errors as
// an older kernel can return EBUSY if e.g. the mount was leaked
// to other mount namespaces. A failure to remove the container's
// mount point is not important and should not be treated
// as a failure to remove the container.
mp := path.Join(d.home, "mnt", id)
err := unix.Rmdir(mp)
if err != nil && !os.IsNotExist(err) {
logrus.WithField("storage-driver", "devicemapper").Warnf("unable to remove mount point %q: %s", mp, err)
}
return nil
}
// Get mounts a device with given id into the root filesystem
func (d *Driver) Get(id, mountLabel string) (string, error) {
d.locker.Lock(id)
defer d.locker.Unlock(id)
mp := path.Join(d.home, "mnt", id)
rootFs := path.Join(mp, "rootfs")
if count := d.ctr.Increment(mp); count > 1 {
return rootFs, nil
}
root := d.idMap.RootPair()
// Create the target directories if they don't exist
if err := idtools.MkdirAllAndChown(path.Join(d.home, "mnt"), 0755, root); err != nil {
d.ctr.Decrement(mp)
return "", err
}
if err := idtools.MkdirAndChown(mp, 0755, root); err != nil && !os.IsExist(err) {
d.ctr.Decrement(mp)
return "", err
}
// Mount the device
if err := d.DeviceSet.MountDevice(id, mp, mountLabel); err != nil {
d.ctr.Decrement(mp)
return "", err
}
if err := idtools.MkdirAllAndChown(rootFs, 0755, root); err != nil {
d.ctr.Decrement(mp)
d.DeviceSet.UnmountDevice(id, mp)
return "", err
}
idFile := path.Join(mp, "id")
if _, err := os.Stat(idFile); err != nil && os.IsNotExist(err) {
// Create an "id" file with the container/image id in it to help reconstruct this in case
// of later problems
if err := os.WriteFile(idFile, []byte(id), 0600); err != nil {
d.ctr.Decrement(mp)
d.DeviceSet.UnmountDevice(id, mp)
return "", err
}
}
return rootFs, nil
}
// Put unmounts a device and removes it.
func (d *Driver) Put(id string) error {
d.locker.Lock(id)
defer d.locker.Unlock(id)
mp := path.Join(d.home, "mnt", id)
if count := d.ctr.Decrement(mp); count > 0 {
return nil
}
err := d.DeviceSet.UnmountDevice(id, mp)
if err != nil {
logrus.WithField("storage-driver", "devicemapper").Errorf("Error unmounting device %s: %v", id, err)
}
return err
}
// Exists checks to see if the device exists.
func (d *Driver) Exists(id string) bool {
return d.DeviceSet.HasDevice(id)
}

67
daemon/graphdriver/devmapper/mount.go
View file

@ -1,67 +0,0 @@
//go:build linux
// +build linux
package devmapper // import "github.com/docker/docker/daemon/graphdriver/devmapper"
import (
"bytes"
"fmt"
"os"
)
type probeData struct {
fsName string
magic string
offset uint64
}
// ProbeFsType returns the filesystem name for the given device id.
func ProbeFsType(device string) (string, error) {
probes := []probeData{
{"btrfs", "_BHRfS_M", 0x10040},
{"ext4", "\123\357", 0x438},
{"xfs", "XFSB", 0},
}
maxLen := uint64(0)
for _, p := range probes {
l := p.offset + uint64(len(p.magic))
if l > maxLen {
maxLen = l
}
}
file, err := os.Open(device)
if err != nil {
return "", err
}
defer file.Close()
buffer := make([]byte, maxLen)
l, err := file.Read(buffer)
if err != nil {
return "", err
}
if uint64(l) != maxLen {
return "", fmt.Errorf("devmapper: unable to detect filesystem type of %s, short read", device)
}
for _, p := range probes {
if bytes.Equal([]byte(p.magic), buffer[p.offset:p.offset+uint64(len(p.magic))]) {
return p.fsName, nil
}
}
return "", fmt.Errorf("devmapper: Unknown filesystem type on %s", device)
}
func joinMountOptions(a, b string) string {
if a == "" {
return b
}
if b == "" {
return a
}
return a + "," + b
}

6
daemon/graphdriver/driver.go
View file

@ -316,18 +316,14 @@ func isEmptyDir(name string) bool {
// isDeprecated checks if a storage-driver is marked "deprecated"
func isDeprecated(name string) bool {
switch name {
// NOTE: when deprecating a driver, update daemon.fillDriverInfo() accordingly
case "devicemapper":
return true
}
return false
}
// checkRemoved checks if a storage-driver has been deprecated (and removed)
func checkRemoved(name string) error {
switch name {
case "aufs", "overlay":
case "aufs", "devicemapper", "overlay":
return NotSupportedError(fmt.Sprintf("[graphdriver] ERROR: the %s storage-driver has been deprecated and removed; visit https://docs.docker.com/go/storage-driver/ for more information", name))
}
return nil

2
daemon/graphdriver/driver_linux.go
View file

@ -50,7 +50,7 @@ const (
var (
// List of drivers that should be used in an order
priority = "overlay2,fuse-overlayfs,btrfs,zfs,devicemapper,vfs"
priority = "overlay2,fuse-overlayfs,btrfs,zfs,vfs"
// FsNames maps filesystem id to name of the filesystem.
FsNames = map[FsMagic]string{

9
daemon/graphdriver/register/register_devicemapper.go
View file

@ -1,9 +0,0 @@
//go:build !exclude_graphdriver_devicemapper && !static_build && linux
// +build !exclude_graphdriver_devicemapper,!static_build,linux
package register // import "github.com/docker/docker/daemon/graphdriver/register"
import (
// register the devmapper graphdriver
_ "github.com/docker/docker/daemon/graphdriver/devmapper"
)

2
daemon/info.go
View file

@ -128,7 +128,7 @@ WARNING: The %s storage-driver is deprecated, and will be removed in a future re
Refer to the documentation for more information: https://docs.docker.com/go/storage-driver/`
switch v.Driver {
case "devicemapper", "overlay":
case "overlay":
v.Warnings = append(v.Warnings, fmt.Sprintf(warnMsg, v.Driver))
}

2
docs/api/v1.18.md
View file

@ -377,7 +377,7 @@ Return low-level information on the container `id`
"WorkingDir": ""
},
"Created": "2015-01-06T15:47:31.485331387Z",
"Driver": "devicemapper",
"Driver": "overlay2",
"ExecDriver": "native-0.2",
"ExecIDs": null,
"HostConfig": {

2
docs/api/v1.19.md
View file

@ -387,7 +387,7 @@ Return low-level information on the container `id`
"WorkingDir": ""
},
"Created": "2015-01-06T15:47:31.485331387Z",
"Driver": "devicemapper",
"Driver": "overlay2",
"ExecDriver": "native-0.2",
"ExecIDs": null,
"HostConfig": {

2
docs/api/v1.20.md
View file

@ -390,7 +390,7 @@ Return low-level information on the container `id`
"WorkingDir": ""
},
"Created": "2015-01-06T15:47:31.485331387Z",
"Driver": "devicemapper",
"Driver": "overlay2",
"ExecDriver": "native-0.2",
"ExecIDs": null,
"HostConfig": {

2
docs/api/v1.21.md
View file

@ -412,7 +412,7 @@ Return low-level information on the container `id`
"StopSignal": "SIGTERM"
},
"Created": "2015-01-06T15:47:31.485331387Z",
"Driver": "devicemapper",
"Driver": "overlay2",
"ExecDriver": "native-0.2",
"ExecIDs": null,
"HostConfig": {

2
docs/api/v1.22.md
View file

@ -529,7 +529,7 @@ Return low-level information on the container `id`
"StopSignal": "SIGTERM"
},
"Created": "2015-01-06T15:47:31.485331387Z",
"Driver": "devicemapper",
"Driver": "overlay2",
"ExecIDs": null,
"HostConfig": {
"Binds": null,

2
docs/api/v1.23.md
View file

@ -555,7 +555,7 @@ Return low-level information on the container `id`
"StopSignal": "SIGTERM"
},
"Created": "2015-01-06T15:47:31.485331387Z",
"Driver": "devicemapper",
"Driver": "overlay2",
"ExecIDs": null,
"HostConfig": {
"Binds": null,

2
docs/api/v1.24.md
View file

@ -597,7 +597,7 @@ Return low-level information on the container `id`
"StopSignal": "SIGTERM"
},
"Created": "2015-01-06T15:47:31.485331387Z",
"Driver": "devicemapper",
"Driver": "overlay2",
"ExecIDs": null,
"HostConfig": {
"Binds": null,

2
docs/api/v1.25.yaml
View file

@ -2995,7 +2995,7 @@ paths:
StopSignal: "SIGTERM"
StopTimeout: 10
Created: "2015-01-06T15:47:31.485331387Z"
Driver: "devicemapper"
Driver: "overlay2"
HostConfig:
MaximumIOps: 0
MaximumIOBps: 0

2
docs/api/v1.26.yaml
View file

@ -3000,7 +3000,7 @@ paths:
StopSignal: "SIGTERM"
StopTimeout: 10
Created: "2015-01-06T15:47:31.485331387Z"
Driver: "devicemapper"
Driver: "overlay2"
HostConfig:
MaximumIOps: 0
MaximumIOBps: 0

2
docs/api/v1.27.yaml
View file

@ -3060,7 +3060,7 @@ paths:
StopSignal: "SIGTERM"
StopTimeout: 10
Created: "2015-01-06T15:47:31.485331387Z"
Driver: "devicemapper"
Driver: "overlay2"
HostConfig:
MaximumIOps: 0
MaximumIOBps: 0

2
docs/api/v1.28.yaml
View file

@ -3150,7 +3150,7 @@ paths:
StopSignal: "SIGTERM"
StopTimeout: 10
Created: "2015-01-06T15:47:31.485331387Z"
Driver: "devicemapper"
Driver: "overlay2"
HostConfig:
MaximumIOps: 0
MaximumIOBps: 0

2
docs/api/v1.29.yaml
View file

@ -3184,7 +3184,7 @@ paths:
StopSignal: "SIGTERM"
StopTimeout: 10
Created: "2015-01-06T15:47:31.485331387Z"
Driver: "devicemapper"
Driver: "overlay2"
HostConfig:
MaximumIOps: 0
MaximumIOBps: 0

2
docs/api/v1.30.yaml
View file

@ -3410,7 +3410,7 @@ paths:
StopSignal: "SIGTERM"
StopTimeout: 10
Created: "2015-01-06T15:47:31.485331387Z"
Driver: "devicemapper"
Driver: "overlay2"
HostConfig:
MaximumIOps: 0
MaximumIOBps: 0

2
docs/api/v1.31.yaml
View file

@ -3480,7 +3480,7 @@ paths:
StopSignal: "SIGTERM"
StopTimeout: 10
Created: "2015-01-06T15:47:31.485331387Z"
Driver: "devicemapper"
Driver: "overlay2"
HostConfig:
MaximumIOps: 0
MaximumIOBps: 0

2
docs/api/v1.32.yaml
View file

@ -4722,7 +4722,7 @@ paths:
StopSignal: "SIGTERM"
StopTimeout: 10
Created: "2015-01-06T15:47:31.485331387Z"
Driver: "devicemapper"
Driver: "overlay2"
HostConfig:
MaximumIOps: 0
MaximumIOBps: 0

2
docs/api/v1.33.yaml
View file

@ -4727,7 +4727,7 @@ paths:
StopSignal: "SIGTERM"
StopTimeout: 10
Created: "2015-01-06T15:47:31.485331387Z"
Driver: "devicemapper"
Driver: "overlay2"
HostConfig:
MaximumIOps: 0
MaximumIOBps: 0

2
docs/api/v1.34.yaml
View file

@ -4756,7 +4756,7 @@ paths:
StopSignal: "SIGTERM"
StopTimeout: 10
Created: "2015-01-06T15:47:31.485331387Z"
Driver: "devicemapper"
Driver: "overlay2"
HostConfig:
MaximumIOps: 0
MaximumIOBps: 0

2
docs/api/v1.35.yaml
View file

@ -4738,7 +4738,7 @@ paths:
StopSignal: "SIGTERM"
StopTimeout: 10
Created: "2015-01-06T15:47:31.485331387Z"
Driver: "devicemapper"
Driver: "overlay2"
HostConfig:
MaximumIOps: 0
MaximumIOBps: 0

2
docs/api/v1.36.yaml
View file

@ -4754,7 +4754,7 @@ paths:
StopSignal: "SIGTERM"
StopTimeout: 10
Created: "2015-01-06T15:47:31.485331387Z"
Driver: "devicemapper"
Driver: "overlay2"
HostConfig:
MaximumIOps: 0
MaximumIOBps: 0

2
docs/api/v1.37.yaml
View file

@ -4774,7 +4774,7 @@ paths:
StopSignal: "SIGTERM"
StopTimeout: 10
Created: "2015-01-06T15:47:31.485331387Z"
Driver: "devicemapper"
Driver: "overlay2"
HostConfig:
MaximumIOps: 0
MaximumIOBps: 0

2
docs/api/v1.38.yaml
View file

@ -4832,7 +4832,7 @@ paths:
StopSignal: "SIGTERM"
StopTimeout: 10
Created: "2015-01-06T15:47:31.485331387Z"
Driver: "devicemapper"
Driver: "overlay2"
ExecIDs:
- "b35395de42bc8abd327f9dd65d913b9ba28c74d2f0734eeeae84fa1c616a0fca"
- "3fc1232e5cd20c8de182ed81178503dc6437f4e7ef12b52cc5e8de020652f1c4"

2
docs/api/v1.39.yaml
View file

@ -5824,7 +5824,7 @@ paths:
StopSignal: "SIGTERM"
StopTimeout: 10
Created: "2015-01-06T15:47:31.485331387Z"
Driver: "devicemapper"
Driver: "overlay2"
ExecIDs:
- "b35395de42bc8abd327f9dd65d913b9ba28c74d2f0734eeeae84fa1c616a0fca"
- "3fc1232e5cd20c8de182ed81178503dc6437f4e7ef12b52cc5e8de020652f1c4"

2
docs/api/v1.40.yaml
View file

@ -6125,7 +6125,7 @@ paths:
StopSignal: "SIGTERM"
StopTimeout: 10
Created: "2015-01-06T15:47:31.485331387Z"
Driver: "devicemapper"
Driver: "overlay2"
ExecIDs:
- "b35395de42bc8abd327f9dd65d913b9ba28c74d2f0734eeeae84fa1c616a0fca"
- "3fc1232e5cd20c8de182ed81178503dc6437f4e7ef12b52cc5e8de020652f1c4"

2
docs/api/v1.41.yaml
View file

@ -6317,7 +6317,7 @@ paths:
StopSignal: "SIGTERM"
StopTimeout: 10
Created: "2015-01-06T15:47:31.485331387Z"
Driver: "devicemapper"
Driver: "overlay2"
ExecIDs:
- "b35395de42bc8abd327f9dd65d913b9ba28c74d2f0734eeeae84fa1c616a0fca"
- "3fc1232e5cd20c8de182ed81178503dc6437f4e7ef12b52cc5e8de020652f1c4"

2
docs/contributing/set-up-dev-env.md
View file

@ -130,7 +130,7 @@ can take over 15 minutes to complete.
```none
Successfully built 3d872560918e
Successfully tagged docker-dev:dry-run-test
docker run --rm -i --privileged -e BUILDFLAGS -e KEEPBUNDLE -e DOCKER_BUILD_GOGC -e DOCKER_BUILD_PKGS -e DOCKER_CLIENTONLY -e DOCKER_DEBUG -e DOCKER_EXPERIMENTAL -e DOCKER_GITCOMMIT -e DOCKER_GRAPHDRIVER=devicemapper -e DOCKER_REMAP_ROOT -e DOCKER_STORAGE_OPTS -e DOCKER_USERLANDPROXY -e TESTDIRS -e TESTFLAGS -e TIMEOUT -v "home/ubuntu/repos/docker/bundles:/go/src/github.com/docker/docker/bundles" -t "docker-dev:dry-run-test" bash
docker run --rm -i --privileged -e BUILDFLAGS -e KEEPBUNDLE -e DOCKER_BUILD_GOGC -e DOCKER_BUILD_PKGS -e DOCKER_CLIENTONLY -e DOCKER_DEBUG -e DOCKER_EXPERIMENTAL -e DOCKER_GITCOMMIT -e DOCKER_GRAPHDRIVER=vfs -e DOCKER_REMAP_ROOT -e DOCKER_STORAGE_OPTS -e DOCKER_USERLANDPROXY -e TESTDIRS -e TESTFLAGS -e TIMEOUT -v "home/ubuntu/repos/docker/bundles:/go/src/github.com/docker/docker/bundles" -t "docker-dev:dry-run-test" bash
#
```

24
integration-cli/docker_cli_create_test.go
View file

@ -63,30 +63,6 @@ func (s *DockerCLICreateSuite) TestCreateArgs(c *testing.T) {
}
}
// Make sure we can grow the container's rootfs at creation time.
func (s *DockerCLICreateSuite) TestCreateGrowRootfs(c *testing.T) {
// Windows and Devicemapper support growing the rootfs
if testEnv.OSType != "windows" {
testRequires(c, Devicemapper)
}
out, _ := dockerCmd(c, "create", "--storage-opt", "size=120G", "busybox")
cleanedContainerID := strings.TrimSpace(out)
inspectOut := inspectField(c, cleanedContainerID, "HostConfig.StorageOpt")
assert.Equal(c, inspectOut, "map[size:120G]")
}
// Make sure we cannot shrink the container's rootfs at creation time.
func (s *DockerCLICreateSuite) TestCreateShrinkRootfs(c *testing.T) {
testRequires(c, Devicemapper)
// Ensure this fails because of the defaultBaseFsSize is 10G
out, _, err := dockerCmdWithError("create", "--storage-opt", "size=5G", "busybox")
assert.ErrorContains(c, err, "", out)
assert.Assert(c, strings.Contains(out, "Container size cannot be smaller than"))
}
// Make sure we can set hostconfig options too
func (s *DockerCLICreateSuite) TestCreateHostConfig(c *testing.T) {
out, _ := dockerCmd(c, "create", "-P", "busybox", "echo")

72
integration-cli/docker_cli_daemon_test.go
View file

@ -34,7 +34,6 @@ import (
"github.com/docker/docker/libnetwork/iptables"
"github.com/docker/docker/opts"
testdaemon "github.com/docker/docker/testutil/daemon"
units "github.com/docker/go-units"
"github.com/moby/sys/mount"
"golang.org/x/sys/unix"
"gotest.tools/v3/assert"
@ -203,77 +202,6 @@ func (s *DockerDaemonSuite) TestDaemonStartIptablesFalse(c *testing.T) {
s.d.Start(c, "--iptables=false")
}
// Make sure we cannot shrink base device at daemon restart.
func (s *DockerDaemonSuite) TestDaemonRestartWithInvalidBasesize(c *testing.T) {
testRequires(c, Devicemapper)
s.d.Start(c)
oldBasesizeBytes := getBaseDeviceSize(c, s.d)
var newBasesizeBytes int64 = 1073741824 // 1GB in bytes
if newBasesizeBytes < oldBasesizeBytes {
err := s.d.RestartWithError("--storage-opt", fmt.Sprintf("dm.basesize=%d", newBasesizeBytes))
assert.Assert(c, err != nil, "daemon should not have started as new base device size is less than existing base device size: %v", err)
// 'err != nil' is expected behaviour, no new daemon started,
// so no need to stop daemon.
if err != nil {
return
}
}
s.d.Stop(c)
}
// Make sure we can grow base device at daemon restart.
func (s *DockerDaemonSuite) TestDaemonRestartWithIncreasedBasesize(c *testing.T) {
testRequires(c, Devicemapper)
s.d.Start(c)
oldBasesizeBytes := getBaseDeviceSize(c, s.d)
var newBasesizeBytes int64 = 53687091200 // 50GB in bytes
if newBasesizeBytes < oldBasesizeBytes {
c.Skipf("New base device size (%v) must be greater than (%s)", units.HumanSize(float64(newBasesizeBytes)), units.HumanSize(float64(oldBasesizeBytes)))
}
err := s.d.RestartWithError("--storage-opt", fmt.Sprintf("dm.basesize=%d", newBasesizeBytes))
assert.Assert(c, err == nil, "we should have been able to start the daemon with increased base device size: %v", err)
basesizeAfterRestart := getBaseDeviceSize(c, s.d)
newBasesize, err := convertBasesize(newBasesizeBytes)
assert.Assert(c, err == nil, "Error in converting base device size: %v", err)
assert.Equal(c, newBasesize, basesizeAfterRestart, "Basesize passed is not equal to Basesize set")
s.d.Stop(c)
}
func getBaseDeviceSize(c *testing.T, d *daemon.Daemon) int64 {
info := d.Info(c)
for _, statusLine := range info.DriverStatus {
key, value := statusLine[0], statusLine[1]
if key == "Base Device Size" {
return parseDeviceSize(c, value)
}
}
c.Fatal("failed to parse Base Device Size from info")
return int64(0)
}
func parseDeviceSize(c *testing.T, raw string) int64 {
size, err := units.RAMInBytes(strings.TrimSpace(raw))
assert.NilError(c, err)
return size
}
func convertBasesize(basesizeBytes int64) (int64, error) {
basesize := units.HumanSize(float64(basesizeBytes))
basesize = strings.Trim(basesize, " ")[:len(basesize)-3]
basesizeFloat, err := strconv.ParseFloat(strings.Trim(basesize, " "), 64)
if err != nil {
return 0, err
}
return int64(basesizeFloat) * 1024 * 1024 * 1024, nil
}
// Issue #8444: If docker0 bridge is modified (intentionally or unintentionally) and
// no longer has an IP associated, we should gracefully handle that case and associate
// an IP with it rather than fail daemon start

49
integration-cli/docker_cli_inspect_test.go
View file

@ -27,12 +27,6 @@ func (s *DockerCLIInspectSuite) OnTimeout(c *testing.T) {
s.ds.OnTimeout(c)
}
func checkValidGraphDriver(c *testing.T, name string) {
if name != "devicemapper" && name != "overlay" && name != "vfs" && name != "zfs" && name != "btrfs" && name != "aufs" {
c.Fatalf("%v is not a valid graph driver name", name)
}
}
func (s *DockerCLIInspectSuite) TestInspectImage(c *testing.T) {
testRequires(c, DaemonIsLinux)
imageTest := "emptyfs"
@ -177,49 +171,6 @@ func (s *DockerCLIInspectSuite) TestInspectContainerFilterInt(c *testing.T) {
assert.Equal(c, inspectResult, true)
}
func (s *DockerCLIInspectSuite) TestInspectImageGraphDriver(c *testing.T) {
testRequires(c, DaemonIsLinux, Devicemapper)
imageTest := "emptyfs"
name := inspectField(c, imageTest, "GraphDriver.Name")
checkValidGraphDriver(c, name)
deviceID := inspectField(c, imageTest, "GraphDriver.Data.DeviceId")
_, err := strconv.Atoi(deviceID)
assert.Assert(c, err == nil, "failed to inspect DeviceId of the image: %s, %v", deviceID, err)
deviceSize := inspectField(c, imageTest, "GraphDriver.Data.DeviceSize")
_, err = strconv.ParseUint(deviceSize, 10, 64)
assert.Assert(c, err == nil, "failed to inspect DeviceSize of the image: %s, %v", deviceSize, err)
}
func (s *DockerCLIInspectSuite) TestInspectContainerGraphDriver(c *testing.T) {
testRequires(c, DaemonIsLinux, Devicemapper)
out, _ := dockerCmd(c, "run", "-d", "busybox", "true")
out = strings.TrimSpace(out)
name := inspectField(c, out, "GraphDriver.Name")
checkValidGraphDriver(c, name)
imageDeviceID := inspectField(c, "busybox", "GraphDriver.Data.DeviceId")
deviceID := inspectField(c, out, "GraphDriver.Data.DeviceId")
assert.Assert(c, imageDeviceID != deviceID)
_, err := strconv.Atoi(deviceID)
assert.Assert(c, err == nil, "failed to inspect DeviceId of the image: %s, %v", deviceID, err)
deviceSize := inspectField(c, out, "GraphDriver.Data.DeviceSize")
_, err = strconv.ParseUint(deviceSize, 10, 64)
assert.Assert(c, err == nil, "failed to inspect DeviceSize of the image: %s, %v", deviceSize, err)
}
func (s *DockerCLIInspectSuite) TestInspectBindMountPoint(c *testing.T) {
modifier := ",z"
prefix, slash := getPrefixAndSlashFromDaemonPlatform()

4
integration-cli/requirements_test.go
View file

@ -100,10 +100,6 @@ func Apparmor() bool {
return err == nil && len(buf) > 1 && buf[0] == 'Y'
}
func Devicemapper() bool {
return strings.HasPrefix(testEnv.DaemonInfo.Driver, "devicemapper")
}
// containerdSnapshotterEnabled checks if the daemon in the test-environment is
// configured with containerd-snapshotters enabled.
func containerdSnapshotterEnabled() bool {

34
integration/container/stop_linux_test.go
View file

@ -2,19 +2,14 @@ package container // import "github.com/docker/docker/integration/container"
import (
"context"
"fmt"
"strconv"
"strings"
"testing"
"time"
"github.com/docker/docker/api/types"
containertypes "github.com/docker/docker/api/types/container"
"github.com/docker/docker/integration/internal/container"
"gotest.tools/v3/assert"
"gotest.tools/v3/icmd"
"gotest.tools/v3/poll"
"gotest.tools/v3/skip"
)
// TestStopContainerWithTimeout checks that ContainerStop with
@ -69,32 +64,3 @@ func TestStopContainerWithTimeout(t *testing.T) {
})
}
}
func TestDeleteDevicemapper(t *testing.T) {
skip.If(t, testEnv.DaemonInfo.Driver != "devicemapper")
skip.If(t, testEnv.IsRemoteDaemon)
defer setupTest(t)()
client := testEnv.APIClient()
ctx := context.Background()
id := container.Run(ctx, t, client, container.WithName("foo-"+t.Name()), container.WithCmd("echo"))
poll.WaitOn(t, container.IsStopped(ctx, client, id), poll.WithDelay(100*time.Millisecond))
inspect, err := client.ContainerInspect(ctx, id)
assert.NilError(t, err)
deviceID := inspect.GraphDriver.Data["DeviceId"]
// Find pool name from device name
deviceName := inspect.GraphDriver.Data["DeviceName"]
devicePrefix := deviceName[:strings.LastIndex(deviceName, "-")]
devicePool := fmt.Sprintf("/dev/mapper/%s-pool", devicePrefix)
result := icmd.RunCommand("dmsetup", "message", devicePool, "0", fmt.Sprintf("delete %s", deviceID))
result.Assert(t, icmd.Success)
err = client.ContainerRemove(ctx, id, types.ContainerRemoveOptions{})
assert.NilError(t, err)
}

811
pkg/devicemapper/devmapper.go
View file

@ -1,811 +0,0 @@
//go:build linux && cgo
// +build linux,cgo
package devicemapper // import "github.com/docker/docker/pkg/devicemapper"
import (
"errors"
"fmt"
"os"
"runtime"
"unsafe"
"github.com/sirupsen/logrus"
"golang.org/x/sys/unix"
)
// Same as DM_DEVICE_* enum values from libdevmapper.h
//
//nolint:unused
const (
deviceCreate TaskType = iota
deviceReload
deviceRemove
deviceRemoveAll
deviceSuspend
deviceResume
deviceInfo
deviceDeps
deviceRename
deviceVersion
deviceStatus
deviceTable
deviceWaitevent
deviceList
deviceClear
deviceMknodes
deviceListVersions
deviceTargetMsg
deviceSetGeometry
)
const (
addNodeOnResume AddNodeType = iota
addNodeOnCreate
)
// List of errors returned when using devicemapper.
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")
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")
ErrTaskDeferredRemove = errors.New("dm_task_deferred_remove failed")
ErrTaskSetCookie = errors.New("dm_task_set_cookie failed")
ErrNilCookie = errors.New("cookie ptr can't be nil")
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")
ErrInvalidAddNode = errors.New("Invalid AddNode type")
ErrBusy = errors.New("Device is Busy")
ErrDeviceIDExists = errors.New("Device Id Exists")
ErrEnxio = errors.New("No such device or address")
)
var (
dmSawBusy bool
dmSawExist bool
dmSawEnxio bool // No Such Device or Address
dmSawEnoData bool // No data available
)
type (
// Task represents a devicemapper task (like lvcreate, etc.) ; a task is needed for each ioctl
// command to execute.
Task struct {
unmanaged *cdmTask
}
// Deps represents dependents (layer) of a device.
Deps struct {
Count uint32
Filler uint32
Device []uint64
}
// Info represents information about a device.
Info struct {
Exists int
Suspended int
LiveTable int
InactiveTable int
OpenCount int32
EventNr uint32
Major uint32
Minor uint32
ReadOnly int
TargetCount int32
DeferredRemove int
}
// TaskType represents a type of task
TaskType int
// AddNodeType represents a type of node to be added
AddNodeType int
)
// DeviceIDExists 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 DeviceIDExists(err error) bool {
return fmt.Sprint(err) == fmt.Sprint(ErrDeviceIDExists)
}
func (t *Task) destroy() {
if t != nil {
DmTaskDestroy(t.unmanaged)
runtime.SetFinalizer(t, nil)
}
}
// TaskCreateNamed is a convenience function for TaskCreate when a name
// will be set on the task as well
func TaskCreateNamed(t TaskType, name string) (*Task, error) {
task := TaskCreate(t)
if task == nil {
return nil, fmt.Errorf("devicemapper: Can't create task of type %d", int(t))
}
if err := task.setName(name); err != nil {
return nil, fmt.Errorf("devicemapper: Can't set task name %s", name)
}
return task, nil
}
// TaskCreate initializes a devicemapper task of tasktype
func TaskCreate(tasktype TaskType) *Task {
Ctask := DmTaskCreate(int(tasktype))
if Ctask == nil {
return nil
}
task := &Task{unmanaged: Ctask}
runtime.SetFinalizer(task, (*Task).destroy)
return task
}
func (t *Task) run() error {
if res := DmTaskRun(t.unmanaged); res != 1 {
return ErrTaskRun
}
runtime.KeepAlive(t)
return nil
}
func (t *Task) setName(name string) error {
if res := DmTaskSetName(t.unmanaged, name); res != 1 {
return ErrTaskSetName
}
return nil
}
func (t *Task) setMessage(message string) error {
if res := DmTaskSetMessage(t.unmanaged, message); res != 1 {
return ErrTaskSetMessage
}
return nil
}
func (t *Task) setSector(sector uint64) error {
if res := DmTaskSetSector(t.unmanaged, sector); res != 1 {
return ErrTaskSetSector
}
return nil
}
func (t *Task) setCookie(cookie *uint, flags uint16) error {
if cookie == nil {
return ErrNilCookie
}
if res := DmTaskSetCookie(t.unmanaged, cookie, flags); res != 1 {
return ErrTaskSetCookie
}
return nil
}
func (t *Task) setAddNode(addNode AddNodeType) error {
if addNode != addNodeOnResume && addNode != addNodeOnCreate {
return ErrInvalidAddNode
}
if res := DmTaskSetAddNode(t.unmanaged, addNode); res != 1 {
return ErrTaskSetAddNode
}
return nil
}
func (t *Task) addTarget(start, size uint64, ttype, params string) error {
if res := DmTaskAddTarget(t.unmanaged, start, size,
ttype, params); res != 1 {
return ErrTaskAddTarget
}
return nil
}
func (t *Task) getDeps() (*Deps, error) {
var deps *Deps
if deps = DmTaskGetDeps(t.unmanaged); deps == nil {
return nil, ErrTaskGetDeps
}
return deps, nil
}
func (t *Task) getInfo() (*Info, error) {
info := &Info{}
if res := DmTaskGetInfo(t.unmanaged, info); res != 1 {
return nil, ErrTaskGetInfo
}
return info, nil
}
func (t *Task) getInfoWithDeferred() (*Info, error) {
info := &Info{}
if res := DmTaskGetInfoWithDeferred(t.unmanaged, info); res != 1 {
return nil, ErrTaskGetInfo
}
return info, nil
}
func (t *Task) getDriverVersion() (string, error) {
res := DmTaskGetDriverVersion(t.unmanaged)
if res == "" {
return "", ErrTaskGetDriverVersion
}
return res, nil
}
func (t *Task) getNextTarget(next unsafe.Pointer) (nextPtr unsafe.Pointer, start uint64, length uint64, targetType string, params string) {
return DmGetNextTarget(t.unmanaged, next, &start, &length, &targetType, &params), start, length, targetType, params
}
// UdevWait waits for any processes that are waiting for udev to complete the specified cookie.
func UdevWait(cookie *uint) error {
if res := DmUdevWait(*cookie); res != 1 {
logrus.Debugf("devicemapper: Failed to wait on udev cookie %d, %d", *cookie, res)
return ErrUdevWait
}
return nil
}
// SetDevDir sets the dev folder for the device mapper library (usually /dev).
func SetDevDir(dir string) error {
if res := DmSetDevDir(dir); res != 1 {
logrus.Debug("devicemapper: Error dm_set_dev_dir")
return ErrSetDevDir
}
return nil
}
// GetLibraryVersion returns the device mapper library version.
func GetLibraryVersion() (string, error) {
var version string
if res := DmGetLibraryVersion(&version); res != 1 {
return "", ErrGetLibraryVersion
}
return version, nil
}
// 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 UdevSyncSupported() bool {
return DmUdevGetSyncSupport() != 0
}
// UdevSetSyncSupport allows setting whether the udev sync should be enabled.
// The return bool indicates the state of whether the sync is enabled.
func UdevSetSyncSupport(enable bool) bool {
if enable {
DmUdevSetSyncSupport(1)
} else {
DmUdevSetSyncSupport(0)
}
return UdevSyncSupported()
}
// CookieSupported returns whether the version of device-mapper supports the
// use of cookie's in the tasks.
// This is largely a lower level call that other functions use.
func CookieSupported() bool {
return DmCookieSupported() != 0
}
// RemoveDevice is a useful helper for cleaning up a device.
func RemoveDevice(name string) error {
task, err := TaskCreateNamed(deviceRemove, name)
if task == nil {
return err
}
cookie := new(uint)
if err := task.setCookie(cookie, 0); err != nil {
return fmt.Errorf("devicemapper: Can not set cookie: %s", err)
}
defer UdevWait(cookie)
dmSawBusy = false // reset before the task is run
dmSawEnxio = false
if err = task.run(); err != nil {
if dmSawBusy {
return ErrBusy
}
if dmSawEnxio {
return ErrEnxio
}
return fmt.Errorf("devicemapper: Error running RemoveDevice %s", err)
}
return nil
}
// RemoveDeviceDeferred is a useful helper for cleaning up a device, but deferred.
func RemoveDeviceDeferred(name string) error {
logrus.Debugf("devicemapper: RemoveDeviceDeferred START(%s)", name)
defer logrus.Debugf("devicemapper: RemoveDeviceDeferred END(%s)", name)
task, err := TaskCreateNamed(deviceRemove, name)
if task == nil {
return err
}
if err := DmTaskDeferredRemove(task.unmanaged); err != 1 {
return ErrTaskDeferredRemove
}
// set a task cookie and disable library fallback, or else libdevmapper will
// disable udev dm rules and delete the symlink under /dev/mapper by itself,
// even if the removal is deferred by the kernel.
cookie := new(uint)
flags := uint16(DmUdevDisableLibraryFallback)
if err := task.setCookie(cookie, flags); err != nil {
return fmt.Errorf("devicemapper: Can not set cookie: %s", err)
}
// libdevmapper and udev relies on System V semaphore for synchronization,
// semaphores created in `task.setCookie` will be cleaned up in `UdevWait`.
// So these two function call must come in pairs, otherwise semaphores will
// be leaked, and the limit of number of semaphores defined in `/proc/sys/kernel/sem`
// will be reached, which will eventually make all following calls to 'task.SetCookie'
// fail.
// this call will not wait for the deferred removal's final executing, since no
// udev event will be generated, and the semaphore's value will not be incremented
// by udev, what UdevWait is just cleaning up the semaphore.
defer UdevWait(cookie)
dmSawEnxio = false
if err = task.run(); err != nil {
if dmSawEnxio {
return ErrEnxio
}
return fmt.Errorf("devicemapper: Error running RemoveDeviceDeferred %s", err)
}
return nil
}
// CancelDeferredRemove cancels a deferred remove for a device.
func CancelDeferredRemove(deviceName string) error {
task, err := TaskCreateNamed(deviceTargetMsg, deviceName)
if task == nil {
return err
}
if err := task.setSector(0); err != nil {
return fmt.Errorf("devicemapper: Can't set sector %s", err)
}
if err := task.setMessage("@cancel_deferred_remove"); err != nil {
return fmt.Errorf("devicemapper: Can't set message %s", err)
}
dmSawBusy = false
dmSawEnxio = false
if err := task.run(); err != nil {
// A device might be being deleted already
if dmSawBusy {
return ErrBusy
} else if dmSawEnxio {
return ErrEnxio
}
return fmt.Errorf("devicemapper: Error running CancelDeferredRemove %s", err)
}
return nil
}
// GetBlockDeviceSize returns the size of a block device identified by the specified file.
func GetBlockDeviceSize(file *os.File) (uint64, error) {
size, err := ioctlBlkGetSize64(file.Fd())
if err != nil {
logrus.Errorf("devicemapper: Error getblockdevicesize: %s", err)
return 0, ErrGetBlockSize
}
return uint64(size), nil
}
// BlockDeviceDiscard runs discard for the given path.
// This is used as a workaround for the kernel not discarding block so
// on the thin pool when we remove a thinp device, so we do it
// manually
func BlockDeviceDiscard(path string) error {
file, err := os.OpenFile(path, os.O_RDWR, 0)
if err != nil {
return err
}
defer file.Close()
size, err := GetBlockDeviceSize(file)
if err != nil {
return err
}
if err := ioctlBlkDiscard(file.Fd(), 0, size); err != nil {
return err
}
// Without this sometimes the remove of the device that happens after
// discard fails with EBUSY.
unix.Sync()
return nil
}
// CreatePool is the programmatic example of "dmsetup create".
// It creates a device with the specified poolName, data and metadata file and block size.
func CreatePool(poolName string, dataFile, metadataFile *os.File, poolBlockSize uint32) error {
task, err := TaskCreateNamed(deviceCreate, poolName)
if task == nil {
return err
}
size, err := GetBlockDeviceSize(dataFile)
if err != nil {
return fmt.Errorf("devicemapper: Can't get data size %s", err)
}
params := fmt.Sprintf("%s %s %d 32768 1 skip_block_zeroing", metadataFile.Name(), dataFile.Name(), poolBlockSize)
if err := task.addTarget(0, size/512, "thin-pool", params); err != nil {
return fmt.Errorf("devicemapper: Can't add target %s", err)
}
cookie := new(uint)
flags := uint16(DmUdevDisableSubsystemRulesFlag | DmUdevDisableDiskRulesFlag | DmUdevDisableOtherRulesFlag)
if err := task.setCookie(cookie, flags); err != nil {
return fmt.Errorf("devicemapper: Can't set cookie %s", err)
}
defer UdevWait(cookie)
if err := task.run(); err != nil {
return fmt.Errorf("devicemapper: Error running deviceCreate (CreatePool) %s", err)
}
return nil
}
// ReloadPool is the programmatic example of "dmsetup reload".
// It reloads the table with the specified poolName, data and metadata file and block size.
func ReloadPool(poolName string, dataFile, metadataFile *os.File, poolBlockSize uint32) error {
task, err := TaskCreateNamed(deviceReload, poolName)
if task == nil {
return err
}
size, err := GetBlockDeviceSize(dataFile)
if err != nil {
return fmt.Errorf("devicemapper: Can't get data size %s", err)
}
params := fmt.Sprintf("%s %s %d 32768 1 skip_block_zeroing", metadataFile.Name(), dataFile.Name(), poolBlockSize)
if err := task.addTarget(0, size/512, "thin-pool", params); err != nil {
return fmt.Errorf("devicemapper: Can't add target %s", err)
}
if err := task.run(); err != nil {
return fmt.Errorf("devicemapper: Error running ReloadPool %s", err)
}
return nil
}
// GetDeps is the programmatic example of "dmsetup deps".
// It outputs a list of devices referenced by the live table for the specified device.
func GetDeps(name string) (*Deps, error) {
task, err := TaskCreateNamed(deviceDeps, name)
if task == nil {
return nil, err
}
if err := task.run(); err != nil {
return nil, err
}
return task.getDeps()
}
// GetInfo is the programmatic example of "dmsetup info".
// It outputs some brief information about the device.
func GetInfo(name string) (*Info, error) {
task, err := TaskCreateNamed(deviceInfo, name)
if task == nil {
return nil, err
}
if err := task.run(); err != nil {
return nil, err
}
return task.getInfo()
}
// GetInfoWithDeferred is the programmatic example of "dmsetup info", but deferred.
// It outputs some brief information about the device.
func GetInfoWithDeferred(name string) (*Info, error) {
task, err := TaskCreateNamed(deviceInfo, name)
if task == nil {
return nil, err
}
if err := task.run(); err != nil {
return nil, err
}
return task.getInfoWithDeferred()
}
// GetDriverVersion is the programmatic example of "dmsetup version".
// It outputs version information of the driver.
func GetDriverVersion() (string, error) {
task := TaskCreate(deviceVersion)
if task == nil {
return "", fmt.Errorf("devicemapper: Can't create deviceVersion task")
}
if err := task.run(); err != nil {
return "", err
}
return task.getDriverVersion()
}
// GetStatus is the programmatic example of "dmsetup status".
// It outputs status information for the specified device name.
func GetStatus(name string) (uint64, uint64, string, string, error) {
task, err := TaskCreateNamed(deviceStatus, name)
if task == nil {
logrus.Debugf("devicemapper: GetStatus() Error TaskCreateNamed: %s", err)
return 0, 0, "", "", err
}
if err := task.run(); err != nil {
logrus.Debugf("devicemapper: GetStatus() Error Run: %s", err)
return 0, 0, "", "", err
}
devinfo, err := task.getInfo()
if err != nil {
logrus.Debugf("devicemapper: GetStatus() Error GetInfo: %s", err)
return 0, 0, "", "", err
}
if devinfo.Exists == 0 {
logrus.Debugf("devicemapper: GetStatus() Non existing device %s", name)
return 0, 0, "", "", fmt.Errorf("devicemapper: Non existing device %s", name)
}
_, start, length, targetType, params := task.getNextTarget(unsafe.Pointer(nil))
return start, length, targetType, params, nil
}
// GetTable is the programmatic example for "dmsetup table".
// It outputs the current table for the specified device name.
func GetTable(name string) (uint64, uint64, string, string, error) {
task, err := TaskCreateNamed(deviceTable, name)
if task == nil {
logrus.Debugf("devicemapper: GetTable() Error TaskCreateNamed: %s", err)
return 0, 0, "", "", err
}
if err := task.run(); err != nil {
logrus.Debugf("devicemapper: GetTable() Error Run: %s", err)
return 0, 0, "", "", err
}
devinfo, err := task.getInfo()
if err != nil {
logrus.Debugf("devicemapper: GetTable() Error GetInfo: %s", err)
return 0, 0, "", "", err
}
if devinfo.Exists == 0 {
logrus.Debugf("devicemapper: GetTable() Non existing device %s", name)
return 0, 0, "", "", fmt.Errorf("devicemapper: Non existing device %s", name)
}
_, start, length, targetType, params := task.getNextTarget(unsafe.Pointer(nil))
return start, length, targetType, params, nil
}
// SetTransactionID sets a transaction id for the specified device name.
func SetTransactionID(poolName string, oldID uint64, newID uint64) error {
task, err := TaskCreateNamed(deviceTargetMsg, poolName)
if task == nil {
return err
}
if err := task.setSector(0); err != nil {
return fmt.Errorf("devicemapper: Can't set sector %s", err)
}
if err := task.setMessage(fmt.Sprintf("set_transaction_id %d %d", oldID, newID)); err != nil {
return fmt.Errorf("devicemapper: Can't set message %s", err)
}
if err := task.run(); err != nil {
return fmt.Errorf("devicemapper: Error running SetTransactionID %s", err)
}
return nil
}
// SuspendDevice is the programmatic example of "dmsetup suspend".
// It suspends the specified device.
func SuspendDevice(name string) error {
task, err := TaskCreateNamed(deviceSuspend, name)
if task == nil {
return err
}
if err := task.run(); err != nil {
return fmt.Errorf("devicemapper: Error running deviceSuspend %s", err)
}
return nil
}
// ResumeDevice is the programmatic example of "dmsetup resume".
// It un-suspends the specified device.
func ResumeDevice(name string) error {
task, err := TaskCreateNamed(deviceResume, name)
if task == nil {
return err
}
cookie := new(uint)
if err := task.setCookie(cookie, 0); err != nil {
return fmt.Errorf("devicemapper: Can't set cookie %s", err)
}
defer UdevWait(cookie)
if err := task.run(); err != nil {
return fmt.Errorf("devicemapper: Error running deviceResume %s", err)
}
return nil
}
// CreateDevice creates a device with the specified poolName with the specified device id.
func CreateDevice(poolName string, deviceID int) error {
logrus.Debugf("devicemapper: CreateDevice(poolName=%v, deviceID=%v)", poolName, deviceID)
task, err := TaskCreateNamed(deviceTargetMsg, poolName)
if task == nil {
return err
}
if err := task.setSector(0); err != nil {
return fmt.Errorf("devicemapper: Can't set sector %s", err)
}
if err := task.setMessage(fmt.Sprintf("create_thin %d", deviceID)); err != nil {
return fmt.Errorf("devicemapper: Can't set message %s", err)
}
dmSawExist = false // reset before the task is run
if err := task.run(); err != nil {
// Caller wants to know about ErrDeviceIDExists so that it can try with a different device id.
if dmSawExist {
return ErrDeviceIDExists
}
return fmt.Errorf("devicemapper: Error running CreateDevice %s", err)
}
return nil
}
// DeleteDevice deletes a device with the specified poolName with the specified device id.
func DeleteDevice(poolName string, deviceID int) error {
task, err := TaskCreateNamed(deviceTargetMsg, poolName)
if task == nil {
return err
}
if err := task.setSector(0); err != nil {
return fmt.Errorf("devicemapper: Can't set sector %s", err)
}
if err := task.setMessage(fmt.Sprintf("delete %d", deviceID)); err != nil {
return fmt.Errorf("devicemapper: Can't set message %s", err)
}
dmSawBusy = false
dmSawEnoData = false
if err := task.run(); err != nil {
if dmSawBusy {
return ErrBusy
}
if dmSawEnoData {
logrus.Debugf("devicemapper: Device(id: %d) from pool(%s) does not exist", deviceID, poolName)
return nil
}
return fmt.Errorf("devicemapper: Error running DeleteDevice %s", err)
}
return nil
}
// ActivateDevice activates the device identified by the specified
// poolName, name and deviceID with the specified size.
func ActivateDevice(poolName string, name string, deviceID int, size uint64) error {
return activateDevice(poolName, name, deviceID, size, "")
}
// ActivateDeviceWithExternal activates the device identified by the specified
// poolName, name and deviceID with the specified size.
func ActivateDeviceWithExternal(poolName string, name string, deviceID int, size uint64, external string) error {
return activateDevice(poolName, name, deviceID, size, external)
}
func activateDevice(poolName string, name string, deviceID int, size uint64, external string) error {
task, err := TaskCreateNamed(deviceCreate, name)
if task == nil {
return err
}
var params string
if len(external) > 0 {
params = fmt.Sprintf("%s %d %s", poolName, deviceID, external)
} else {
params = fmt.Sprintf("%s %d", poolName, deviceID)
}
if err := task.addTarget(0, size/512, "thin", params); err != nil {
return fmt.Errorf("devicemapper: Can't add target %s", err)
}
if err := task.setAddNode(addNodeOnCreate); err != nil {
return fmt.Errorf("devicemapper: Can't add node %s", err)
}
cookie := new(uint)
if err := task.setCookie(cookie, 0); err != nil {
return fmt.Errorf("devicemapper: Can't set cookie %s", err)
}
defer UdevWait(cookie)
if err := task.run(); err != nil {
return fmt.Errorf("devicemapper: Error running deviceCreate (ActivateDevice) %s", err)
}
return nil
}
// CreateSnapDeviceRaw creates a snapshot device. Caller needs to suspend and resume the origin device if it is active.
func CreateSnapDeviceRaw(poolName string, deviceID int, baseDeviceID int) error {
task, err := TaskCreateNamed(deviceTargetMsg, poolName)
if task == nil {
return err
}
if err := task.setSector(0); err != nil {
return fmt.Errorf("devicemapper: Can't set sector %s", err)
}
if err := task.setMessage(fmt.Sprintf("create_snap %d %d", deviceID, baseDeviceID)); err != nil {
return fmt.Errorf("devicemapper: Can't set message %s", err)
}
dmSawExist = false // reset before the task is run
if err := task.run(); err != nil {
// Caller wants to know about ErrDeviceIDExists so that it can try with a different device id.
if dmSawExist {
return ErrDeviceIDExists
}
return fmt.Errorf("devicemapper: Error running deviceCreate (CreateSnapDeviceRaw) %s", err)
}
return nil
}
// CreateSnapDevice creates a snapshot based on the device identified by the baseName and baseDeviceId,
func CreateSnapDevice(poolName string, deviceID int, baseName string, baseDeviceID int) error {
devinfo, _ := GetInfo(baseName)
doSuspend := devinfo != nil && devinfo.Exists != 0
if doSuspend {
if err := SuspendDevice(baseName); err != nil {
return err
}
}
if err := CreateSnapDeviceRaw(poolName, deviceID, baseDeviceID); err != nil {
if doSuspend {
if err2 := ResumeDevice(baseName); err2 != nil {
return fmt.Errorf("CreateSnapDeviceRaw Error: (%v): ResumeDevice Error: (%v)", err, err2)
}
}
return err
}
if doSuspend {
if err := ResumeDevice(baseName); err != nil {
return err
}
}
return nil
}

126
pkg/devicemapper/devmapper_log.go
View file

@ -1,126 +0,0 @@
//go:build linux && cgo
// +build linux,cgo
package devicemapper // import "github.com/docker/docker/pkg/devicemapper"
import "C"
import (
"fmt"
"strings"
"github.com/sirupsen/logrus"
)
// DevmapperLogger defines methods required to register as a callback for
// logging events received from devicemapper. Note that devicemapper will send
// *all* logs regardless to callbacks (including debug logs) so it's
// recommended to not spam the console with the outputs.
type DevmapperLogger interface {
// DMLog is the logging callback containing all of the information from
// devicemapper. The interface is identical to the C libdm counterpart.
DMLog(level int, file string, line int, dmError int, message string)
}
// dmLogger is the current logger in use that is being forwarded our messages.
var dmLogger DevmapperLogger
// LogInit changes the logging callback called after processing libdm logs for
// error message information. The default logger simply forwards all logs to
// logrus. Calling LogInit(nil) disables the calling of callbacks.
func LogInit(logger DevmapperLogger) {
dmLogger = logger
}
// Due to the way cgo works this has to be in a separate file, as devmapper.go has
// definitions in the cgo block, which is incompatible with using "//export"
// DevmapperLogCallback exports the devmapper log callback for cgo. Note that
// because we are using callbacks, this function will be called for *every* log
// in libdm (even debug ones because there's no way of setting the verbosity
// level for an external logging callback).
//
//export DevmapperLogCallback
func DevmapperLogCallback(level C.int, file *C.char, line, dmErrnoOrClass C.int, message *C.char) {
msg := C.GoString(message)
// Track what errno libdm saw, because the library only gives us 0 or 1.
if level < LogLevelDebug {
if strings.Contains(msg, "busy") {
dmSawBusy = true
}
if strings.Contains(msg, "File exists") {
dmSawExist = true
}
if strings.Contains(msg, "No such device or address") {
dmSawEnxio = true
}
if strings.Contains(msg, "No data available") {
dmSawEnoData = true
}
}
if dmLogger != nil {
dmLogger.DMLog(int(level), C.GoString(file), int(line), int(dmErrnoOrClass), msg)
}
}
// DefaultLogger is the default logger used by pkg/devicemapper. It forwards
// all logs that are of higher or equal priority to the given level to the
// corresponding logrus level.
type DefaultLogger struct {
// Level corresponds to the highest libdm level that will be forwarded to
// logrus. In order to change this, register a new DefaultLogger.
Level int
}
// DMLog is the logging callback containing all of the information from
// devicemapper. The interface is identical to the C libdm counterpart.
func (l DefaultLogger) DMLog(level int, file string, line, dmError int, message string) {
if level <= l.Level {
// Forward the log to the correct logrus level, if allowed by dmLogLevel.
logMsg := fmt.Sprintf("libdevmapper(%d): %s:%d (%d) %s", level, file, line, dmError, message)
switch level {
case LogLevelFatal, LogLevelErr:
logrus.Error(logMsg)
case LogLevelWarn:
logrus.Warn(logMsg)
case LogLevelNotice, LogLevelInfo:
logrus.Info(logMsg)
case LogLevelDebug:
logrus.Debug(logMsg)
default:
// Don't drop any "unknown" levels.
logrus.Info(logMsg)
}
}
}
// registerLogCallback registers our own logging callback function for libdm
// (which is DevmapperLogCallback).
//
// Because libdm only gives us {0,1} error codes we need to parse the logs
// produced by libdm (to set dmSawBusy and so on). Note that by registering a
// callback using DevmapperLogCallback, libdm will no longer output logs to
// stderr so we have to log everything ourselves. None of this handling is
// optional because we depend on log callbacks to parse the logs, and if we
// don't forward the log information we'll be in a lot of trouble when
// debugging things.
func registerLogCallback() {
LogWithErrnoInit()
}
func init() {
// Use the default logger by default. We only allow LogLevelFatal by
// default, because internally we mask a lot of libdm errors by retrying
// and similar tricks. Also, libdm is very chatty and we don't want to
// worry users for no reason.
dmLogger = DefaultLogger{
Level: LogLevelFatal,
}
// Register as early as possible so we don't miss anything.
registerLogCallback()
}

246
pkg/devicemapper/devmapper_wrapper.go
View file

@ -1,246 +0,0 @@
//go:build linux && cgo
// +build linux,cgo
package devicemapper // import "github.com/docker/docker/pkg/devicemapper"
/*
#define _GNU_SOURCE
#include <libdevmapper.h>
#include <linux/fs.h> // FIXME: present only for BLKGETSIZE64, maybe we can remove it?
// 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);
static void log_cb(int level, const char *file, int line, int dm_errno_or_class, const char *f, ...)
{
char *buffer = NULL;
va_list ap;
int ret;
va_start(ap, f);
ret = vasprintf(&buffer, f, ap);
va_end(ap);
if (ret < 0) {
// memory allocation failed -- should never happen?
return;
}
DevmapperLogCallback(level, (char *)file, line, dm_errno_or_class, buffer);
free(buffer);
}
static void log_with_errno_init()
{
dm_log_with_errno_init(log_cb);
}
*/
import "C"
import (
"reflect"
"unsafe"
)
type (
cdmTask C.struct_dm_task
)
// IOCTL consts
const (
BlkGetSize64 = C.BLKGETSIZE64
BlkDiscard = C.BLKDISCARD
)
// Devicemapper cookie flags.
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
)
// DeviceMapper mapped functions.
var (
DmGetLibraryVersion = dmGetLibraryVersionFct
DmGetNextTarget = dmGetNextTargetFct
DmSetDevDir = dmSetDevDirFct
DmTaskAddTarget = dmTaskAddTargetFct
DmTaskCreate = dmTaskCreateFct
DmTaskDestroy = dmTaskDestroyFct
DmTaskGetDeps = dmTaskGetDepsFct
DmTaskGetInfo = dmTaskGetInfoFct
DmTaskGetDriverVersion = dmTaskGetDriverVersionFct
DmTaskRun = dmTaskRunFct
DmTaskSetAddNode = dmTaskSetAddNodeFct
DmTaskSetCookie = dmTaskSetCookieFct
DmTaskSetMessage = dmTaskSetMessageFct
DmTaskSetName = dmTaskSetNameFct
DmTaskSetSector = dmTaskSetSectorFct
DmUdevWait = dmUdevWaitFct
DmUdevSetSyncSupport = dmUdevSetSyncSupportFct
DmUdevGetSyncSupport = dmUdevGetSyncSupportFct
DmCookieSupported = dmCookieSupportedFct
LogWithErrnoInit = logWithErrnoInitFct
DmTaskDeferredRemove = dmTaskDeferredRemoveFct
DmTaskGetInfoWithDeferred = dmTaskGetInfoWithDeferredFct
)
func free(p *C.char) {
C.free(unsafe.Pointer(p))
}
func dmTaskDestroyFct(task *cdmTask) {
C.dm_task_destroy((*C.struct_dm_task)(task))
}
func dmTaskCreateFct(taskType int) *cdmTask {
return (*cdmTask)(C.dm_task_create(C.int(taskType)))
}
func dmTaskRunFct(task *cdmTask) int {
ret, _ := C.dm_task_run((*C.struct_dm_task)(task))
return int(ret)
}
func dmTaskSetNameFct(task *cdmTask, name string) int {
Cname := C.CString(name)
defer free(Cname)
return int(C.dm_task_set_name((*C.struct_dm_task)(task), Cname))
}
func dmTaskSetMessageFct(task *cdmTask, message string) int {
Cmessage := C.CString(message)
defer free(Cmessage)
return int(C.dm_task_set_message((*C.struct_dm_task)(task), Cmessage))
}
func dmTaskSetSectorFct(task *cdmTask, sector uint64) int {
return int(C.dm_task_set_sector((*C.struct_dm_task)(task), C.uint64_t(sector)))
}
func dmTaskSetCookieFct(task *cdmTask, cookie *uint, flags uint16) int {
cCookie := C.uint32_t(*cookie)
defer func() {
*cookie = uint(cCookie)
}()
return int(C.dm_task_set_cookie((*C.struct_dm_task)(task), &cCookie, C.uint16_t(flags)))
}
func dmTaskSetAddNodeFct(task *cdmTask, addNode AddNodeType) int {
return int(C.dm_task_set_add_node((*C.struct_dm_task)(task), C.dm_add_node_t(addNode)))
}
func dmTaskAddTargetFct(task *cdmTask, start, size uint64, ttype, params string) int {
Cttype := C.CString(ttype)
defer free(Cttype)
Cparams := C.CString(params)
defer free(Cparams)
return int(C.dm_task_add_target((*C.struct_dm_task)(task), C.uint64_t(start), C.uint64_t(size), Cttype, Cparams))
}
func dmTaskGetDepsFct(task *cdmTask) *Deps {
Cdeps := C.dm_task_get_deps((*C.struct_dm_task)(task))
if Cdeps == nil {
return nil
}
// golang issue: https://github.com/golang/go/issues/11925
var devices []C.uint64_t
devicesHdr := (*reflect.SliceHeader)(unsafe.Pointer(&devices))
devicesHdr.Data = uintptr(unsafe.Pointer(uintptr(unsafe.Pointer(Cdeps)) + unsafe.Sizeof(*Cdeps)))
devicesHdr.Len = int(Cdeps.count)
devicesHdr.Cap = int(Cdeps.count)
deps := &Deps{
Count: uint32(Cdeps.count),
Filler: uint32(Cdeps.filler),
}
for _, device := range devices {
deps.Device = append(deps.Device, uint64(device))
}
return deps
}
func dmTaskGetInfoFct(task *cdmTask, info *Info) int {
Cinfo := C.struct_dm_info{}
defer func() {
info.Exists = int(Cinfo.exists)
info.Suspended = int(Cinfo.suspended)
info.LiveTable = int(Cinfo.live_table)
info.InactiveTable = int(Cinfo.inactive_table)
info.OpenCount = int32(Cinfo.open_count)
info.EventNr = uint32(Cinfo.event_nr)
info.Major = uint32(Cinfo.major)
info.Minor = uint32(Cinfo.minor)
info.ReadOnly = int(Cinfo.read_only)
info.TargetCount = int32(Cinfo.target_count)
}()
return int(C.dm_task_get_info((*C.struct_dm_task)(task), &Cinfo))
}
func dmTaskGetDriverVersionFct(task *cdmTask) string {
buffer := C.malloc(128)
defer C.free(buffer)
res := C.dm_task_get_driver_version((*C.struct_dm_task)(task), (*C.char)(buffer), 128)
if res == 0 {
return ""
}
return C.GoString((*C.char)(buffer))
}
func dmGetNextTargetFct(task *cdmTask, next unsafe.Pointer, start, length *uint64, target, params *string) unsafe.Pointer {
var (
Cstart, Clength C.uint64_t
CtargetType, Cparams *C.char
)
defer func() {
*start = uint64(Cstart)
*length = uint64(Clength)
*target = C.GoString(CtargetType)
*params = C.GoString(Cparams)
}()
//lint:ignore SA4000 false positive on (identical expressions on the left and right side of the '==' operator) (staticcheck)
nextp := C.dm_get_next_target((*C.struct_dm_task)(task), next, &Cstart, &Clength, &CtargetType, &Cparams)
return nextp
}
func dmUdevSetSyncSupportFct(syncWithUdev int) {
C.dm_udev_set_sync_support(C.int(syncWithUdev))
}
func dmUdevGetSyncSupportFct() int {
return int(C.dm_udev_get_sync_support())
}
func dmUdevWaitFct(cookie uint) int {
return int(C.dm_udev_wait(C.uint32_t(cookie)))
}
func dmCookieSupportedFct() int {
return int(C.dm_cookie_supported())
}
func logWithErrnoInitFct() {
C.log_with_errno_init()
}
func dmSetDevDirFct(dir string) int {
Cdir := C.CString(dir)
defer free(Cdir)
return int(C.dm_set_dev_dir(Cdir))
}
func dmGetLibraryVersionFct(version *string) int {
buffer := C.CString(string(make([]byte, 128)))
defer free(buffer)
defer func() {
*version = C.GoString(buffer)
}()
return int(C.dm_get_library_version(buffer, 128))
}

7
pkg/devicemapper/devmapper_wrapper_dynamic.go
View file

@ -1,7 +0,0 @@
//go:build linux && cgo && !static_build
// +build linux,cgo,!static_build
package devicemapper // import "github.com/docker/docker/pkg/devicemapper"
// #cgo pkg-config: devmapper
import "C"

35
pkg/devicemapper/devmapper_wrapper_dynamic_deferred_remove.go
View file

@ -1,35 +0,0 @@
//go:build linux && cgo && !static_build && !libdm_dlsym_deferred_remove && !libdm_no_deferred_remove
// +build linux,cgo,!static_build,!libdm_dlsym_deferred_remove,!libdm_no_deferred_remove
package devicemapper // import "github.com/docker/docker/pkg/devicemapper"
/*
#include <libdevmapper.h>
*/
import "C"
// LibraryDeferredRemovalSupport tells if the feature is supported by the
// current Docker invocation.
const LibraryDeferredRemovalSupport = true
func dmTaskDeferredRemoveFct(task *cdmTask) int {
return int(C.dm_task_deferred_remove((*C.struct_dm_task)(task)))
}
func dmTaskGetInfoWithDeferredFct(task *cdmTask, info *Info) int {
Cinfo := C.struct_dm_info{}
defer func() {
info.Exists = int(Cinfo.exists)
info.Suspended = int(Cinfo.suspended)
info.LiveTable = int(Cinfo.live_table)
info.InactiveTable = int(Cinfo.inactive_table)
info.OpenCount = int32(Cinfo.open_count)
info.EventNr = uint32(Cinfo.event_nr)
info.Major = uint32(Cinfo.major)
info.Minor = uint32(Cinfo.minor)
info.ReadOnly = int(Cinfo.read_only)
info.TargetCount = int32(Cinfo.target_count)
info.DeferredRemove = int(Cinfo.deferred_remove)
}()
return int(C.dm_task_get_info((*C.struct_dm_task)(task), &Cinfo))
}

128
pkg/devicemapper/devmapper_wrapper_dynamic_dlsym_deferred_remove.go
View file

@ -1,128 +0,0 @@
//go:build linux && cgo && !static_build && libdm_dlsym_deferred_remove && !libdm_no_deferred_remove
// +build linux,cgo,!static_build,libdm_dlsym_deferred_remove,!libdm_no_deferred_remove
package devicemapper
/*
#cgo LDFLAGS: -ldl
#include <stdlib.h>
#include <dlfcn.h>
#include <libdevmapper.h>
// Yes, I know this looks scary. In order to be able to fill our own internal
// dm_info with deferred_remove we need to have a struct definition that is
// correct (regardless of the version of libdm that was used to compile it). To
// this end, we define struct_backport_dm_info. This code comes from lvm2, and
// I have verified that the structure has only ever had elements *appended* to
// it (since 2001).
//
// It is also important that this structure be _larger_ than the dm_info that
// libdevmapper expected. Otherwise libdm might try to write to memory it
// shouldn't (they don't have a "known size" API).
struct backport_dm_info {
int exists;
int suspended;
int live_table;
int inactive_table;
int32_t open_count;
uint32_t event_nr;
uint32_t major;
uint32_t minor;
int read_only;
int32_t target_count;
int deferred_remove;
int internal_suspend;
// Padding, purely for our own safety. This is to avoid cases where libdm
// was updated underneath us and we call into dm_task_get_info() with too
// small of a buffer.
char _[512];
};
// We have to wrap this in CGo, because Go really doesn't like function pointers.
int call_dm_task_deferred_remove(void *fn, struct dm_task *task)
{
int (*_dm_task_deferred_remove)(struct dm_task *task) = fn;
return _dm_task_deferred_remove(task);
}
*/
import "C"
import (
"unsafe"
"github.com/sirupsen/logrus"
)
// dm_task_deferred_remove is not supported by all distributions, due to
// out-dated versions of devicemapper. However, in the case where the
// devicemapper library was updated without rebuilding Docker (which can happen
// in some distributions) then we should attempt to dynamically load the
// relevant object rather than try to link to it.
// dmTaskDeferredRemoveFct is a "bound" version of dm_task_deferred_remove.
// It is nil if dm_task_deferred_remove was not found in the libdevmapper that
// is currently loaded.
var dmTaskDeferredRemovePtr unsafe.Pointer
// LibraryDeferredRemovalSupport tells if the feature is supported by the
// current Docker invocation. This value is fixed during init.
var LibraryDeferredRemovalSupport bool
func init() {
// Clear any errors.
var err *C.char
C.dlerror()
// The symbol we want to fetch.
symName := C.CString("dm_task_deferred_remove")
defer C.free(unsafe.Pointer(symName))
// See if we can find dm_task_deferred_remove. Since we already are linked
// to libdevmapper, we can search our own address space (rather than trying
// to guess what libdevmapper is called). We use NULL here, as RTLD_DEFAULT
// is not available in CGO (even if you set _GNU_SOURCE for some reason).
// The semantics are identical on glibc.
sym := C.dlsym(nil, symName)
err = C.dlerror()
if err != nil {
logrus.Debugf("devmapper: could not load dm_task_deferred_remove: %s", C.GoString(err))
return
}
logrus.Debugf("devmapper: found dm_task_deferred_remove at %x", uintptr(sym))
dmTaskDeferredRemovePtr = sym
LibraryDeferredRemovalSupport = true
}
func dmTaskDeferredRemoveFct(task *cdmTask) int {
sym := dmTaskDeferredRemovePtr
if sym == nil || !LibraryDeferredRemovalSupport {
return -1
}
return int(C.call_dm_task_deferred_remove(sym, (*C.struct_dm_task)(task)))
}
func dmTaskGetInfoWithDeferredFct(task *cdmTask, info *Info) int {
if !LibraryDeferredRemovalSupport {
return -1
}
Cinfo := C.struct_backport_dm_info{}
defer func() {
info.Exists = int(Cinfo.exists)
info.Suspended = int(Cinfo.suspended)
info.LiveTable = int(Cinfo.live_table)
info.InactiveTable = int(Cinfo.inactive_table)
info.OpenCount = int32(Cinfo.open_count)
info.EventNr = uint32(Cinfo.event_nr)
info.Major = uint32(Cinfo.major)
info.Minor = uint32(Cinfo.minor)
info.ReadOnly = int(Cinfo.read_only)
info.TargetCount = int32(Cinfo.target_count)
info.DeferredRemove = int(Cinfo.deferred_remove)
}()
return int(C.dm_task_get_info((*C.struct_dm_task)(task), (*C.struct_dm_info)(unsafe.Pointer(&Cinfo))))
}

17
pkg/devicemapper/devmapper_wrapper_no_deferred_remove.go
View file

@ -1,17 +0,0 @@
//go:build linux && cgo && !libdm_dlsym_deferred_remove && libdm_no_deferred_remove
// +build linux,cgo,!libdm_dlsym_deferred_remove,libdm_no_deferred_remove
package devicemapper // import "github.com/docker/docker/pkg/devicemapper"
// LibraryDeferredRemovalSupport tells if the feature is supported by the
// current Docker invocation.
const LibraryDeferredRemovalSupport = false
func dmTaskDeferredRemoveFct(task *cdmTask) int {
// Error. Nobody should be calling it.
return -1
}
func dmTaskGetInfoWithDeferredFct(task *cdmTask, info *Info) int {
return -1
}

29
pkg/devicemapper/ioctl.go
View file

@ -1,29 +0,0 @@
//go:build linux && cgo
// +build linux,cgo
package devicemapper // import "github.com/docker/docker/pkg/devicemapper"
import (
"unsafe"
"golang.org/x/sys/unix"
)
func ioctlBlkGetSize64(fd uintptr) (int64, error) {
var size int64
if _, _, err := unix.Syscall(unix.SYS_IOCTL, fd, BlkGetSize64, uintptr(unsafe.Pointer(&size))); err != 0 {
return 0, err
}
return size, nil
}
func ioctlBlkDiscard(fd uintptr, offset, length uint64) error {
var r [2]uint64
r[0] = offset
r[1] = length
if _, _, err := unix.Syscall(unix.SYS_IOCTL, fd, BlkDiscard, uintptr(unsafe.Pointer(&r[0]))); err != 0 {
return err
}
return nil
}

11
pkg/devicemapper/log.go
View file

@ -1,11 +0,0 @@
package devicemapper // import "github.com/docker/docker/pkg/devicemapper"
// definitions from lvm2 lib/log/log.h
const (
LogLevelFatal = 2 + iota // _LOG_FATAL
LogLevelErr // _LOG_ERR
LogLevelWarn // _LOG_WARN
LogLevelNotice // _LOG_NOTICE
LogLevelInfo // _LOG_INFO
LogLevelDebug // _LOG_DEBUG
)

1
project/ISSUE-TRIAGE.md
View file

@ -71,7 +71,6 @@ have:
| area/security/trust |
| area/storage |
| area/storage/btrfs |
| area/storage/devicemapper |
| area/storage/overlay |
| area/storage/zfs |
| area/swarm |

6
project/PACKAGERS.md
View file

@ -89,14 +89,14 @@ To disable btrfs:
export DOCKER_BUILDTAGS='exclude_graphdriver_btrfs'
```
To disable devicemapper:
To disable zfs:
```bash
export DOCKER_BUILDTAGS='exclude_graphdriver_devicemapper'
export DOCKER_BUILDTAGS='exclude_graphdriver_zfs'
```
NOTE: if you need to set more than one build tag, space separate them:
```bash
export DOCKER_BUILDTAGS='exclude_graphdriver_devicemapper exclude_graphdriver_btrfs'
export DOCKER_BUILDTAGS='exclude_graphdriver_btrfs exclude_graphdriver_zfs'
```
## System Dependencies