mirror of
https://github.com/ceph/go-ceph
synced 2024-12-24 07:03:00 +00:00
f84140356a
This function is used to "manually" trigger a snapshot for snapshot based mirroring. It is needed as a pre-req to test actual cross-cluster mirroring and the full functionality of GetGlobalMirrorStatus. Signed-off-by: John Mulligan <jmulligan@redhat.com>
424 lines
13 KiB
Go
424 lines
13 KiB
Go
// +build !nautilus
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// Initially, we're only providing mirroring related functions for octopus as
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// that version of ceph deprecated a number of the functions in nautilus. If
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// you need mirroring on an earlier supported version of ceph please file an
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// issue in our tracker.
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package rbd
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// #cgo LDFLAGS: -lrbd
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// #include <stdlib.h>
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// #include <rbd/librbd.h>
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import "C"
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import (
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"fmt"
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"math"
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"unsafe"
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"github.com/ceph/go-ceph/internal/retry"
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"github.com/ceph/go-ceph/rados"
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)
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// MirrorMode is used to indicate an approach used for RBD mirroring.
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type MirrorMode int64
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const (
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// MirrorModeDisabled disables mirroring.
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MirrorModeDisabled = MirrorMode(C.RBD_MIRROR_MODE_DISABLED)
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// MirrorModeImage enables mirroring on a per-image basis.
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MirrorModeImage = MirrorMode(C.RBD_MIRROR_MODE_IMAGE)
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// MirrorModePool enables mirroring on all journaled images.
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MirrorModePool = MirrorMode(C.RBD_MIRROR_MODE_POOL)
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)
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// String representation of MirrorMode.
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func (m MirrorMode) String() string {
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switch m {
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case MirrorModeDisabled:
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return "disabled"
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case MirrorModeImage:
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return "image"
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case MirrorModePool:
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return "pool"
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default:
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return "<unknown>"
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}
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}
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// ImageMirrorMode is used to indicate the mirroring approach for an RBD image.
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type ImageMirrorMode int64
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const (
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// ImageMirrorModeJournal uses journaling to propagate RBD images between
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// ceph clusters.
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ImageMirrorModeJournal = ImageMirrorMode(C.RBD_MIRROR_IMAGE_MODE_JOURNAL)
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// ImageMirrorModeSnapshot uses snapshots to propagate RBD images between
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// ceph clusters.
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ImageMirrorModeSnapshot = ImageMirrorMode(C.RBD_MIRROR_IMAGE_MODE_SNAPSHOT)
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)
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// String representation of ImageMirrorMode.
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func (imm ImageMirrorMode) String() string {
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switch imm {
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case ImageMirrorModeJournal:
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return "journal"
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case ImageMirrorModeSnapshot:
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return "snapshot"
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default:
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return "<unknown>"
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}
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}
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// SetMirrorMode is used to enable or disable pool level mirroring with either
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// an automatic or per-image behavior.
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//
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// Implements:
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// int rbd_mirror_mode_set(rados_ioctx_t io_ctx,
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// rbd_mirror_mode_t mirror_mode);
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func SetMirrorMode(ioctx *rados.IOContext, mode MirrorMode) error {
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ret := C.rbd_mirror_mode_set(
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cephIoctx(ioctx),
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C.rbd_mirror_mode_t(mode))
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return getError(ret)
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}
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// GetMirrorMode is used to fetch the current mirroring mode for a pool.
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//
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// Implements:
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// int rbd_mirror_mode_get(rados_ioctx_t io_ctx,
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// rbd_mirror_mode_t *mirror_mode);
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func GetMirrorMode(ioctx *rados.IOContext) (MirrorMode, error) {
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var mode C.rbd_mirror_mode_t
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ret := C.rbd_mirror_mode_get(
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cephIoctx(ioctx),
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&mode)
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if err := getError(ret); err != nil {
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return MirrorModeDisabled, err
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}
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return MirrorMode(mode), nil
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}
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// MirrorEnable will enable mirroring for an image using the specified mode.
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//
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// Implements:
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// int rbd_mirror_image_enable2(rbd_image_t image,
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// rbd_mirror_image_mode_t mode);
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func (image *Image) MirrorEnable(mode ImageMirrorMode) error {
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if err := image.validate(imageIsOpen); err != nil {
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return err
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}
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ret := C.rbd_mirror_image_enable2(image.image, C.rbd_mirror_image_mode_t(mode))
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return getError(ret)
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}
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// MirrorDisable will disable mirroring for the image.
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//
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// Implements:
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// int rbd_mirror_image_disable(rbd_image_t image, bool force);
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func (image *Image) MirrorDisable(force bool) error {
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if err := image.validate(imageIsOpen); err != nil {
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return err
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}
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ret := C.rbd_mirror_image_disable(image.image, C.bool(force))
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return getError(ret)
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}
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// MirrorPromote will promote the image to primary status.
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//
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// Implements:
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// int rbd_mirror_image_promote(rbd_image_t image, bool force);
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func (image *Image) MirrorPromote(force bool) error {
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if err := image.validate(imageIsOpen); err != nil {
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return err
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}
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ret := C.rbd_mirror_image_promote(image.image, C.bool(force))
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return getError(ret)
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}
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// MirrorDemote will demote the image to secondary status.
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//
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// Implements:
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// int rbd_mirror_image_demote(rbd_image_t image);
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func (image *Image) MirrorDemote() error {
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if err := image.validate(imageIsOpen); err != nil {
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return err
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}
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ret := C.rbd_mirror_image_demote(image.image)
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return getError(ret)
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}
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// MirrorResync is used to manually resolve split-brain status by triggering
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// resynchronization.
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//
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// Implements:
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// int rbd_mirror_image_resync(rbd_image_t image);
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func (image *Image) MirrorResync() error {
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if err := image.validate(imageIsOpen); err != nil {
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return err
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}
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ret := C.rbd_mirror_image_resync(image.image)
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return getError(ret)
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}
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// MirrorInstanceID returns a string naming the instance id for the image.
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//
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// Implements:
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// int rbd_mirror_image_get_instance_id(rbd_image_t image,
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// char *instance_id,
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// size_t *id_max_length);
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func (image *Image) MirrorInstanceID() (string, error) {
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if err := image.validate(imageIsOpen); err != nil {
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return "", err
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}
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var (
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err error
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buf []byte
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cSize C.size_t
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)
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retry.WithSizes(1024, 1<<16, func(size int) retry.Hint {
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cSize = C.size_t(size)
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buf = make([]byte, cSize)
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ret := C.rbd_mirror_image_get_instance_id(
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image.image,
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(*C.char)(unsafe.Pointer(&buf[0])),
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&cSize)
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err = getErrorIfNegative(ret)
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return retry.Size(int(cSize)).If(err == errRange)
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})
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if err != nil {
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return "", err
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}
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return string(buf[:cSize]), nil
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}
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// MirrorImageState represents the mirroring state of a RBD image.
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type MirrorImageState C.rbd_mirror_image_state_t
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const (
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// MirrorImageDisabling is the representation of
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// RBD_MIRROR_IMAGE_DISABLING from librbd.
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MirrorImageDisabling = MirrorImageState(C.RBD_MIRROR_IMAGE_DISABLING)
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// MirrorImageEnabled is the representation of
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// RBD_MIRROR_IMAGE_ENABLED from librbd.
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MirrorImageEnabled = MirrorImageState(C.RBD_MIRROR_IMAGE_ENABLED)
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// MirrorImageDisabled is the representation of
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// RBD_MIRROR_IMAGE_DISABLED from librbd.
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MirrorImageDisabled = MirrorImageState(C.RBD_MIRROR_IMAGE_DISABLED)
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)
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// String representation of MirrorImageState.
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func (mis MirrorImageState) String() string {
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switch mis {
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case MirrorImageDisabling:
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return "disabling"
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case MirrorImageEnabled:
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return "enabled"
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case MirrorImageDisabled:
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return "disabled"
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default:
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return "<unknown>"
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}
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}
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// MirrorImageInfo represents the mirroring status information of a RBD image.
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type MirrorImageInfo struct {
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GlobalID string
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State MirrorImageState
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Primary bool
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}
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func convertMirrorImageInfo(cInfo *C.rbd_mirror_image_info_t) MirrorImageInfo {
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return MirrorImageInfo{
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GlobalID: C.GoString(cInfo.global_id),
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State: MirrorImageState(cInfo.state),
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Primary: bool(cInfo.primary),
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}
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}
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// GetMirrorImageInfo fetches the mirroring status information of a RBD image.
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//
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// Implements:
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// int rbd_mirror_image_get_info(rbd_image_t image,
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// rbd_mirror_image_info_t *mirror_image_info,
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// size_t info_size)
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func (image *Image) GetMirrorImageInfo() (*MirrorImageInfo, error) {
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if err := image.validate(imageIsOpen); err != nil {
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return nil, err
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}
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var cInfo C.rbd_mirror_image_info_t
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ret := C.rbd_mirror_image_get_info(
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image.image,
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&cInfo,
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C.sizeof_rbd_mirror_image_info_t)
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if ret < 0 {
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return nil, getError(ret)
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}
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mii := convertMirrorImageInfo(&cInfo)
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// free C memory allocated by C.rbd_mirror_image_get_info call
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C.rbd_mirror_image_get_info_cleanup(&cInfo)
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return &mii, nil
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}
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// GetImageMirrorMode fetches the mirroring approach for an RBD image.
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//
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// Implements:
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// int rbd_mirror_image_get_mode(rbd_image_t image, rbd_mirror_image_mode_t *mode);
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func (image *Image) GetImageMirrorMode() (ImageMirrorMode, error) {
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var mode C.rbd_mirror_image_mode_t
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if err := image.validate(imageIsOpen); err != nil {
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return ImageMirrorMode(mode), err
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}
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ret := C.rbd_mirror_image_get_mode(image.image, &mode)
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return ImageMirrorMode(mode), getError(ret)
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}
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// MirrorImageStatusState is used to indicate the state of a mirrored image
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// within the site status info.
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type MirrorImageStatusState int64
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const (
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// MirrorImageStatusStateUnknown is equivalent to MIRROR_IMAGE_STATUS_STATE_UNKNOWN
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MirrorImageStatusStateUnknown = MirrorImageStatusState(C.MIRROR_IMAGE_STATUS_STATE_UNKNOWN)
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// MirrorImageStatusStateError is equivalent to MIRROR_IMAGE_STATUS_STATE_ERROR
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MirrorImageStatusStateError = MirrorImageStatusState(C.MIRROR_IMAGE_STATUS_STATE_ERROR)
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// MirrorImageStatusStateSyncing is equivalent to MIRROR_IMAGE_STATUS_STATE_SYNCING
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MirrorImageStatusStateSyncing = MirrorImageStatusState(C.MIRROR_IMAGE_STATUS_STATE_SYNCING)
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// MirrorImageStatusStateStartingReplay is equivalent to MIRROR_IMAGE_STATUS_STATE_STARTING_REPLAY
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MirrorImageStatusStateStartingReplay = MirrorImageStatusState(C.MIRROR_IMAGE_STATUS_STATE_STARTING_REPLAY)
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// MirrorImageStatusStateReplaying is equivalent to MIRROR_IMAGE_STATUS_STATE_REPLAYING
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MirrorImageStatusStateReplaying = MirrorImageStatusState(C.MIRROR_IMAGE_STATUS_STATE_REPLAYING)
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// MirrorImageStatusStateStoppingReplay is equivalent to MIRROR_IMAGE_STATUS_STATE_STOPPING_REPLAY
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MirrorImageStatusStateStoppingReplay = MirrorImageStatusState(C.MIRROR_IMAGE_STATUS_STATE_STOPPING_REPLAY)
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// MirrorImageStatusStateStopped is equivalent to MIRROR_IMAGE_STATUS_STATE_STOPPED
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MirrorImageStatusStateStopped = MirrorImageStatusState(C.MIRROR_IMAGE_STATUS_STATE_STOPPED)
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)
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// String represents the MirrorImageStatusState as a short string.
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func (state MirrorImageStatusState) String() (s string) {
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switch state {
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case MirrorImageStatusStateUnknown:
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s = "unknown"
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case MirrorImageStatusStateError:
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s = "error"
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case MirrorImageStatusStateSyncing:
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s = "syncing"
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case MirrorImageStatusStateStartingReplay:
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s = "starting_replay"
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case MirrorImageStatusStateReplaying:
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s = "replaying"
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case MirrorImageStatusStateStoppingReplay:
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s = "stopping_replay"
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case MirrorImageStatusStateStopped:
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s = "stopped"
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default:
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s = fmt.Sprintf("unknown(%d)", state)
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}
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return s
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}
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// SiteMirrorImageStatus contains information pertaining to the status of
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// a mirrored image within a site.
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type SiteMirrorImageStatus struct {
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MirrorUUID string
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State MirrorImageStatusState
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Description string
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LastUpdate int64
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Up bool
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}
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// GlobalMirrorImageStatus contains information pertaining to the global
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// status of a mirrored image. It contains general information as well
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// as per-site information stored in the SiteStatuses slice.
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type GlobalMirrorImageStatus struct {
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Name string
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Info MirrorImageInfo
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SiteStatuses []SiteMirrorImageStatus
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}
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// LocalStatus returns one SiteMirrorImageStatus item from the SiteStatuses
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// slice that corresponds to the local site's status. If the local status
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// is not found than the error ErrNotExist will be returned.
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func (gmis GlobalMirrorImageStatus) LocalStatus() (SiteMirrorImageStatus, error) {
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var (
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ss SiteMirrorImageStatus
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err error = ErrNotExist
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)
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for i := range gmis.SiteStatuses {
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// I couldn't find it explicitly documented, but a site mirror uuid
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// of an empty string indicates that this is the local site.
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// This pattern occurs in both the pybind code and ceph c++.
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if gmis.SiteStatuses[i].MirrorUUID == "" {
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ss = gmis.SiteStatuses[i]
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err = nil
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break
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}
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}
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return ss, err
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}
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type siteArray [math.MaxInt32]C.rbd_mirror_image_site_status_t
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// GetGlobalMirrorStatus returns status information pertaining to the state
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// of the images's mirroring.
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//
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// Implements:
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// int rbd_mirror_image_get_global_status(
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// rbd_image_t image,
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// rbd_mirror_image_global_status_t *mirror_image_global_status,
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// size_t status_size);
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func (image *Image) GetGlobalMirrorStatus() (GlobalMirrorImageStatus, error) {
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if err := image.validate(imageIsOpen); err != nil {
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return GlobalMirrorImageStatus{}, err
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}
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s := C.rbd_mirror_image_global_status_t{}
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ret := C.rbd_mirror_image_get_global_status(
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image.image,
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&s,
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C.sizeof_rbd_mirror_image_global_status_t)
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if err := getError(ret); err != nil {
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return GlobalMirrorImageStatus{}, err
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}
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defer C.rbd_mirror_image_global_status_cleanup(&s)
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status := GlobalMirrorImageStatus{
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Name: C.GoString(s.name),
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Info: convertMirrorImageInfo(&s.info),
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SiteStatuses: make([]SiteMirrorImageStatus, s.site_statuses_count),
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}
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// use the "Sven Technique" to treat the C pointer as a go slice temporarily
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sscs := (*siteArray)(unsafe.Pointer(s.site_statuses))[:s.site_statuses_count:s.site_statuses_count]
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for i := C.uint32_t(0); i < s.site_statuses_count; i++ {
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ss := sscs[i]
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status.SiteStatuses[i] = SiteMirrorImageStatus{
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MirrorUUID: C.GoString(ss.mirror_uuid),
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State: MirrorImageStatusState(ss.state),
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Description: C.GoString(ss.description),
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LastUpdate: int64(ss.last_update),
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Up: bool(ss.up),
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}
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}
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return status, nil
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}
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// CreateMirrorSnapshot creates a snapshot for image propagation to mirrors.
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//
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// Implements:
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// int rbd_mirror_image_create_snapshot(rbd_image_t image,
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// uint64_t *snap_id);
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func (image *Image) CreateMirrorSnapshot() (uint64, error) {
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var snapID C.uint64_t
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ret := C.rbd_mirror_image_create_snapshot(
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image.image,
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&snapID)
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return uint64(snapID), getError(ret)
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}
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