go-ceph/rbd/rbd.go

1404 lines
37 KiB
Go

package rbd
// #cgo LDFLAGS: -lrbd
// /* force XSI-complaint strerror_r() */
// #define _POSIX_C_SOURCE 200112L
// #undef _GNU_SOURCE
// #include <errno.h>
// #include <stdlib.h>
// #include <rados/librados.h>
// #include <rbd/librbd.h>
// #include <rbd/features.h>
import "C"
import (
"bytes"
"errors"
"fmt"
"io"
"time"
"unsafe"
"github.com/ceph/go-ceph/errutil"
"github.com/ceph/go-ceph/rados"
)
const (
// RBD features.
RbdFeatureLayering = uint64(C.RBD_FEATURE_LAYERING)
RbdFeatureStripingV2 = uint64(C.RBD_FEATURE_STRIPINGV2)
RbdFeatureExclusiveLock = uint64(C.RBD_FEATURE_EXCLUSIVE_LOCK)
RbdFeatureObjectMap = uint64(C.RBD_FEATURE_OBJECT_MAP)
RbdFeatureFastDiff = uint64(C.RBD_FEATURE_FAST_DIFF)
RbdFeatureDeepFlatten = uint64(C.RBD_FEATURE_DEEP_FLATTEN)
RbdFeatureJournaling = uint64(C.RBD_FEATURE_JOURNALING)
RbdFeatureDataPool = uint64(C.RBD_FEATURE_DATA_POOL)
RbdFeaturesDefault = uint64(C.RBD_FEATURES_DEFAULT)
// Features that make an image inaccessible for read or write by clients that don't understand
// them.
RbdFeaturesIncompatible = uint64(C.RBD_FEATURES_INCOMPATIBLE)
// Features that make an image unwritable by clients that don't understand them.
RbdFeaturesRwIncompatible = uint64(C.RBD_FEATURES_RW_INCOMPATIBLE)
// Features that may be dynamically enabled or disabled.
RbdFeaturesMutable = uint64(C.RBD_FEATURES_MUTABLE)
// Features that only work when used with a single client using the image for writes.
RbdFeaturesSingleClient = uint64(C.RBD_FEATURES_SINGLE_CLIENT)
// Image.Seek() constants
SeekSet = int(C.SEEK_SET)
SeekCur = int(C.SEEK_CUR)
SeekEnd = int(C.SEEK_END)
)
// bits for Image.validate() and Snapshot.validate()
const (
imageNeedsName uint32 = 1 << iota
imageNeedsIOContext
imageIsOpen
snapshotNeedsName
// NoSnapshot indicates that no snapshot name is in use (see OpenImage)
NoSnapshot = ""
)
//
type RBDError int
var (
ErrNoIOContext = errors.New("RBD image does not have an IOContext")
ErrNoName = errors.New("RBD image does not have a name")
ErrSnapshotNoName = errors.New("RBD snapshot does not have a name")
ErrImageNotOpen = errors.New("RBD image not open")
ErrNotFound = errors.New("RBD image not found")
// retained for compatibility with old versions
RbdErrorImageNotOpen = ErrImageNotOpen
RbdErrorNotFound = ErrNotFound
)
//
type ImageInfo struct {
Size uint64
Obj_size uint64
Num_objs uint64
Order int
Block_name_prefix string
Parent_pool int64
Parent_name string
}
//
type SnapInfo struct {
Id uint64
Size uint64
Name string
}
//
type Locker struct {
Client string
Cookie string
Addr string
}
//
type Image struct {
io.Reader
io.Writer
io.Seeker
io.ReaderAt
io.WriterAt
name string
offset int64
ioctx *rados.IOContext
image C.rbd_image_t
}
//
type Snapshot struct {
image *Image
name string
}
// TrashInfo contains information about trashed RBDs.
type TrashInfo struct {
Id string // Id string, required to remove / restore trashed RBDs.
Name string // Original name of trashed RBD.
DeletionTime time.Time // Date / time at which the RBD was moved to the trash.
DefermentEndTime time.Time // Date / time after which the trashed RBD may be permanently deleted.
}
//
func split(buf []byte) (values []string) {
tmp := bytes.Split(buf[:len(buf)-1], []byte{0})
for _, s := range tmp {
if len(s) > 0 {
go_s := C.GoString((*C.char)(unsafe.Pointer(&s[0])))
values = append(values, go_s)
}
}
return values
}
// test if a bit is set in the given value
func hasBit(value, bit uint32) bool {
return (value & bit) == bit
}
// validate the attributes listed in the req bitmask, and return an error in
// case the attribute is not set
func (image *Image) validate(req uint32) error {
if hasBit(req, imageNeedsName) && image.name == "" {
return ErrNoName
} else if hasBit(req, imageNeedsIOContext) && image.ioctx == nil {
return ErrNoIOContext
} else if hasBit(req, imageIsOpen) && image.image == nil {
return ErrImageNotOpen
}
return nil
}
// validate the attributes listed in the req bitmask, and return an error in
// case the attribute is not set
// Calls snapshot.image.validate(req) to validate the image attributes.
func (snapshot *Snapshot) validate(req uint32) error {
if hasBit(req, snapshotNeedsName) && snapshot.name == "" {
return ErrSnapshotNoName
} else if snapshot.image != nil {
return snapshot.image.validate(req)
}
return nil
}
func (e RBDError) Error() string {
errno, s := errutil.FormatErrno(int(e))
if s == "" {
return fmt.Sprintf("rbd: ret=%d", errno)
}
return fmt.Sprintf("rbd: ret=%d, %s", errno, s)
}
func getError(err C.int) error {
if err != 0 {
if err == -C.ENOENT {
return ErrNotFound
}
return RBDError(err)
} else {
return nil
}
}
// Version returns the major, minor, and patch level of the librbd library.
func Version() (int, int, int) {
var c_major, c_minor, c_patch C.int
C.rbd_version(&c_major, &c_minor, &c_patch)
return int(c_major), int(c_minor), int(c_patch)
}
// GetImage gets a reference to a previously created rbd image.
func GetImage(ioctx *rados.IOContext, name string) *Image {
return &Image{
ioctx: ioctx,
name: name,
}
}
// Create a new rbd image.
//
// Implements:
// int rbd_create(rados_ioctx_t io, const char *name, uint64_t size, int *order);
//
// Also implements (for backward compatibility):
// int rbd_create2(rados_ioctx_t io, const char *name, uint64_t size,
// uint64_t features, int *order);
// int rbd_create3(rados_ioctx_t io, const char *name, uint64_t size,
// uint64_t features, int *order,
// uint64_t stripe_unit, uint64_t stripe_count);
func Create(ioctx *rados.IOContext, name string, size uint64, order int,
args ...uint64) (image *Image, err error) {
var ret C.int
switch len(args) {
case 3:
return Create3(ioctx, name, size, args[0], order, args[1],
args[2])
case 1:
return Create2(ioctx, name, size, args[0], order)
case 0:
c_order := C.int(order)
c_name := C.CString(name)
defer C.free(unsafe.Pointer(c_name))
ret = C.rbd_create(C.rados_ioctx_t(ioctx.Pointer()),
c_name, C.uint64_t(size), &c_order)
default:
return nil, errors.New("Wrong number of argument")
}
if ret < 0 {
return nil, RBDError(ret)
}
return &Image{
ioctx: ioctx,
name: name,
}, nil
}
// Create2 creates a new rbd image using provided features.
//
// Implements:
// int rbd_create2(rados_ioctx_t io, const char *name, uint64_t size,
// uint64_t features, int *order);
func Create2(ioctx *rados.IOContext, name string, size uint64, features uint64,
order int) (image *Image, err error) {
var ret C.int
c_order := C.int(order)
c_name := C.CString(name)
defer C.free(unsafe.Pointer(c_name))
ret = C.rbd_create2(C.rados_ioctx_t(ioctx.Pointer()), c_name,
C.uint64_t(size), C.uint64_t(features), &c_order)
if ret < 0 {
return nil, RBDError(ret)
}
return &Image{
ioctx: ioctx,
name: name,
}, nil
}
// Create3 creates a new rbd image using provided features and stripe
// parameters.
//
// Implements:
// int rbd_create3(rados_ioctx_t io, const char *name, uint64_t size,
// uint64_t features, int *order,
// uint64_t stripe_unit, uint64_t stripe_count);
func Create3(ioctx *rados.IOContext, name string, size uint64, features uint64,
order int, stripe_unit uint64, stripe_count uint64) (image *Image, err error) {
var ret C.int
c_order := C.int(order)
c_name := C.CString(name)
defer C.free(unsafe.Pointer(c_name))
ret = C.rbd_create3(C.rados_ioctx_t(ioctx.Pointer()), c_name,
C.uint64_t(size), C.uint64_t(features), &c_order,
C.uint64_t(stripe_unit), C.uint64_t(stripe_count))
if ret < 0 {
return nil, RBDError(ret)
}
return &Image{
ioctx: ioctx,
name: name,
}, nil
}
// Clone a new rbd image from a snapshot.
//
// Implements:
// int rbd_clone(rados_ioctx_t p_ioctx, const char *p_name,
// const char *p_snapname, rados_ioctx_t c_ioctx,
// const char *c_name, uint64_t features, int *c_order);
func (image *Image) Clone(snapname string, c_ioctx *rados.IOContext, c_name string, features uint64, order int) (*Image, error) {
if err := image.validate(imageNeedsIOContext); err != nil {
return nil, err
}
c_order := C.int(order)
c_p_name := C.CString(image.name)
c_p_snapname := C.CString(snapname)
c_c_name := C.CString(c_name)
defer C.free(unsafe.Pointer(c_p_name))
defer C.free(unsafe.Pointer(c_p_snapname))
defer C.free(unsafe.Pointer(c_c_name))
ret := C.rbd_clone(C.rados_ioctx_t(image.ioctx.Pointer()),
c_p_name, c_p_snapname,
C.rados_ioctx_t(c_ioctx.Pointer()),
c_c_name, C.uint64_t(features), &c_order)
if ret < 0 {
return nil, RBDError(ret)
}
return &Image{
ioctx: c_ioctx,
name: c_name,
}, nil
}
// Remove the specified rbd image.
//
// Implements:
// int rbd_remove(rados_ioctx_t io, const char *name);
func (image *Image) Remove() error {
if err := image.validate(imageNeedsIOContext | imageNeedsName); err != nil {
return err
}
return RemoveImage(image.ioctx, image.name)
}
// Trash will move an image into the RBD trash, where it will be protected (i.e., salvageable) for
// at least the specified delay.
func (image *Image) Trash(delay time.Duration) error {
if err := image.validate(imageNeedsIOContext | imageNeedsName); err != nil {
return err
}
c_name := C.CString(image.name)
defer C.free(unsafe.Pointer(c_name))
return getError(C.rbd_trash_move(C.rados_ioctx_t(image.ioctx.Pointer()), c_name,
C.uint64_t(delay.Seconds())))
}
// Rename an rbd image.
//
// Implements:
// int rbd_rename(rados_ioctx_t src_io_ctx, const char *srcname, const char *destname);
func (image *Image) Rename(destname string) error {
if err := image.validate(imageNeedsIOContext | imageNeedsName); err != nil {
return err
}
c_srcname := C.CString(image.name)
c_destname := C.CString(destname)
defer C.free(unsafe.Pointer(c_srcname))
defer C.free(unsafe.Pointer(c_destname))
err := RBDError(C.rbd_rename(C.rados_ioctx_t(image.ioctx.Pointer()),
c_srcname, c_destname))
if err == 0 {
image.name = destname
return nil
}
return err
}
// Open the rbd image.
//
// Deprecated: The Open function was provided in earlier versions of the API
// and now exists to support older code. The use of OpenImage and
// OpenImageReadOnly is preferred.
func (image *Image) Open(args ...interface{}) error {
if err := image.validate(imageNeedsIOContext | imageNeedsName); err != nil {
return err
}
var (
snapName string
readOnly bool
)
for _, arg := range args {
switch t := arg.(type) {
case string:
snapName = t
case bool:
readOnly = t
default:
return errors.New("Unexpected argument")
}
}
var (
tmp *Image
err error
)
if readOnly {
tmp, err = OpenImageReadOnly(image.ioctx, image.name, snapName)
} else {
tmp, err = OpenImage(image.ioctx, image.name, snapName)
}
if err != nil {
return err
}
image.image = tmp.image
return nil
}
// Close an open rbd image.
//
// Implements:
// int rbd_close(rbd_image_t image);
func (image *Image) Close() error {
if err := image.validate(imageIsOpen); err != nil {
return err
}
if ret := C.rbd_close(image.image); ret != 0 {
return RBDError(ret)
}
image.image = nil
return nil
}
// Resize an rbd image.
//
// Implements:
// int rbd_resize(rbd_image_t image, uint64_t size);
func (image *Image) Resize(size uint64) error {
if err := image.validate(imageIsOpen); err != nil {
return err
}
return getError(C.rbd_resize(image.image, C.uint64_t(size)))
}
// Stat an rbd image.
//
// Implements:
// int rbd_stat(rbd_image_t image, rbd_image_info_t *info, size_t infosize);
func (image *Image) Stat() (info *ImageInfo, err error) {
if err := image.validate(imageIsOpen); err != nil {
return nil, err
}
var c_stat C.rbd_image_info_t
if ret := C.rbd_stat(image.image, &c_stat, C.size_t(unsafe.Sizeof(info))); ret < 0 {
return info, RBDError(ret)
}
return &ImageInfo{
Size: uint64(c_stat.size),
Obj_size: uint64(c_stat.obj_size),
Num_objs: uint64(c_stat.num_objs),
Order: int(c_stat.order),
Block_name_prefix: C.GoString((*C.char)(&c_stat.block_name_prefix[0])),
Parent_pool: int64(c_stat.parent_pool),
Parent_name: C.GoString((*C.char)(&c_stat.parent_name[0]))}, nil
}
// IsOldFormat returns true if the rbd image uses the old format.
//
// Implements:
// int rbd_get_old_format(rbd_image_t image, uint8_t *old);
func (image *Image) IsOldFormat() (old_format bool, err error) {
if err := image.validate(imageIsOpen); err != nil {
return false, err
}
var c_old_format C.uint8_t
ret := C.rbd_get_old_format(image.image,
&c_old_format)
if ret < 0 {
return false, RBDError(ret)
}
return c_old_format != 0, nil
}
// GetSize returns the size of the rbd image.
//
// Implements:
// int rbd_size(rbd_image_t image, uint64_t *size);
func (image *Image) GetSize() (size uint64, err error) {
if err := image.validate(imageIsOpen); err != nil {
return 0, err
}
if ret := C.rbd_get_size(image.image, (*C.uint64_t)(&size)); ret < 0 {
return 0, RBDError(ret)
}
return size, nil
}
// GetFeatures returns the features bitmask for the rbd image.
//
// Implements:
// int rbd_get_features(rbd_image_t image, uint64_t *features);
func (image *Image) GetFeatures() (features uint64, err error) {
if err := image.validate(imageIsOpen); err != nil {
return 0, err
}
if ret := C.rbd_get_features(image.image, (*C.uint64_t)(&features)); ret < 0 {
return 0, RBDError(ret)
}
return features, nil
}
// GetStripeUnit returns the stripe-unit value for the rbd image.
//
// Implements:
// int rbd_get_stripe_unit(rbd_image_t image, uint64_t *stripe_unit);
func (image *Image) GetStripeUnit() (stripe_unit uint64, err error) {
if err := image.validate(imageIsOpen); err != nil {
return 0, err
}
if ret := C.rbd_get_stripe_unit(image.image, (*C.uint64_t)(&stripe_unit)); ret < 0 {
return 0, RBDError(ret)
}
return stripe_unit, nil
}
// GetStripeCount returns the stripe-count value for the rbd image.
//
// Implements:
// int rbd_get_stripe_count(rbd_image_t image, uint64_t *stripe_count);
func (image *Image) GetStripeCount() (stripe_count uint64, err error) {
if err := image.validate(imageIsOpen); err != nil {
return 0, err
}
if ret := C.rbd_get_stripe_count(image.image, (*C.uint64_t)(&stripe_count)); ret < 0 {
return 0, RBDError(ret)
}
return stripe_count, nil
}
// GetOverlap returns the overlapping bytes between the rbd image and its
// parent.
//
// Implements:
// int rbd_get_overlap(rbd_image_t image, uint64_t *overlap);
func (image *Image) GetOverlap() (overlap uint64, err error) {
if err := image.validate(imageIsOpen); err != nil {
return 0, err
}
if ret := C.rbd_get_overlap(image.image, (*C.uint64_t)(&overlap)); ret < 0 {
return overlap, RBDError(ret)
}
return overlap, nil
}
// Copy one rbd image to another.
//
// Implements:
// int rbd_copy(rbd_image_t image, rados_ioctx_t dest_io_ctx, const char *destname);
func (image *Image) Copy(ioctx *rados.IOContext, destname string) error {
if err := image.validate(imageIsOpen); err != nil {
return err
} else if ioctx == nil {
return ErrNoIOContext
} else if len(destname) == 0 {
return ErrNoName
}
c_destname := C.CString(destname)
defer C.free(unsafe.Pointer(c_destname))
return getError(C.rbd_copy(image.image,
C.rados_ioctx_t(ioctx.Pointer()), c_destname))
}
// Copy one rbd image to another, using an image handle.
//
// Implements:
// int rbd_copy2(rbd_image_t src, rbd_image_t dest);
func (image *Image) Copy2(dest *Image) error {
if err := image.validate(imageIsOpen); err != nil {
return err
} else if err := dest.validate(imageIsOpen); err != nil {
return err
}
return getError(C.rbd_copy2(image.image, dest.image))
}
// Flatten removes snapshot references from the image.
//
// Implements:
// int rbd_flatten(rbd_image_t image);
func (image *Image) Flatten() error {
if err := image.validate(imageIsOpen); err != nil {
return err
}
return getError(C.rbd_flatten(image.image))
}
// ListLockers returns a list of clients that have locks on the image.
//
// Impelemnts:
// ssize_t rbd_list_lockers(rbd_image_t image, int *exclusive,
// char *tag, size_t *tag_len,
// char *clients, size_t *clients_len,
// char *cookies, size_t *cookies_len,
// char *addrs, size_t *addrs_len);
func (image *Image) ListLockers() (tag string, lockers []Locker, err error) {
if err := image.validate(imageIsOpen); err != nil {
return "", nil, err
}
var c_exclusive C.int
var c_tag_len, c_clients_len, c_cookies_len, c_addrs_len C.size_t
var c_locker_cnt C.ssize_t
C.rbd_list_lockers(image.image, &c_exclusive,
nil, (*C.size_t)(&c_tag_len),
nil, (*C.size_t)(&c_clients_len),
nil, (*C.size_t)(&c_cookies_len),
nil, (*C.size_t)(&c_addrs_len))
// no locker held on rbd image when either c_clients_len,
// c_cookies_len or c_addrs_len is *0*, so just quickly returned
if int(c_clients_len) == 0 || int(c_cookies_len) == 0 ||
int(c_addrs_len) == 0 {
lockers = make([]Locker, 0)
return "", lockers, nil
}
tag_buf := make([]byte, c_tag_len)
clients_buf := make([]byte, c_clients_len)
cookies_buf := make([]byte, c_cookies_len)
addrs_buf := make([]byte, c_addrs_len)
c_locker_cnt = C.rbd_list_lockers(image.image, &c_exclusive,
(*C.char)(unsafe.Pointer(&tag_buf[0])), (*C.size_t)(&c_tag_len),
(*C.char)(unsafe.Pointer(&clients_buf[0])), (*C.size_t)(&c_clients_len),
(*C.char)(unsafe.Pointer(&cookies_buf[0])), (*C.size_t)(&c_cookies_len),
(*C.char)(unsafe.Pointer(&addrs_buf[0])), (*C.size_t)(&c_addrs_len))
// rbd_list_lockers returns negative value for errors
// and *0* means no locker held on rbd image.
// but *0* is unexpected here because first rbd_list_lockers already
// dealt with no locker case
if int(c_locker_cnt) <= 0 {
return "", nil, RBDError(c_locker_cnt)
}
clients := split(clients_buf)
cookies := split(cookies_buf)
addrs := split(addrs_buf)
lockers = make([]Locker, c_locker_cnt)
for i := 0; i < int(c_locker_cnt); i++ {
lockers[i] = Locker{Client: clients[i],
Cookie: cookies[i],
Addr: addrs[i]}
}
return string(tag_buf), lockers, nil
}
// LockExclusive acquires an exclusive lock on the rbd image.
//
// Implements:
// int rbd_lock_exclusive(rbd_image_t image, const char *cookie);
func (image *Image) LockExclusive(cookie string) error {
if err := image.validate(imageIsOpen); err != nil {
return err
}
c_cookie := C.CString(cookie)
defer C.free(unsafe.Pointer(c_cookie))
return getError(C.rbd_lock_exclusive(image.image, c_cookie))
}
// LockShared acquires a shared lock on the rbd image.
//
// Implements:
// int rbd_lock_shared(rbd_image_t image, const char *cookie, const char *tag);
func (image *Image) LockShared(cookie string, tag string) error {
if err := image.validate(imageIsOpen); err != nil {
return err
}
c_cookie := C.CString(cookie)
c_tag := C.CString(tag)
defer C.free(unsafe.Pointer(c_cookie))
defer C.free(unsafe.Pointer(c_tag))
return getError(C.rbd_lock_shared(image.image, c_cookie, c_tag))
}
// Unlock releases a lock on the image.
//
// Implements:
// int rbd_lock_shared(rbd_image_t image, const char *cookie, const char *tag);
func (image *Image) Unlock(cookie string) error {
if err := image.validate(imageIsOpen); err != nil {
return err
}
c_cookie := C.CString(cookie)
defer C.free(unsafe.Pointer(c_cookie))
return getError(C.rbd_unlock(image.image, c_cookie))
}
// BreakLock forces the release of a lock held by another client.
//
// Implements:
// int rbd_break_lock(rbd_image_t image, const char *client, const char *cookie);
func (image *Image) BreakLock(client string, cookie string) error {
if err := image.validate(imageIsOpen); err != nil {
return err
}
c_client := C.CString(client)
c_cookie := C.CString(cookie)
defer C.free(unsafe.Pointer(c_client))
defer C.free(unsafe.Pointer(c_cookie))
return getError(C.rbd_break_lock(image.image, c_client, c_cookie))
}
// ssize_t rbd_read(rbd_image_t image, uint64_t ofs, size_t len, char *buf);
// TODO: int64_t rbd_read_iterate(rbd_image_t image, uint64_t ofs, size_t len,
// int (*cb)(uint64_t, size_t, const char *, void *), void *arg);
// TODO: int rbd_read_iterate2(rbd_image_t image, uint64_t ofs, uint64_t len,
// int (*cb)(uint64_t, size_t, const char *, void *), void *arg);
// TODO: int rbd_diff_iterate(rbd_image_t image,
// const char *fromsnapname,
// uint64_t ofs, uint64_t len,
// int (*cb)(uint64_t, size_t, int, void *), void *arg);
func (image *Image) Read(data []byte) (int, error) {
if err := image.validate(imageIsOpen); err != nil {
return 0, err
}
if len(data) == 0 {
return 0, nil
}
ret := int(C.rbd_read(
image.image,
(C.uint64_t)(image.offset),
(C.size_t)(len(data)),
(*C.char)(unsafe.Pointer(&data[0]))))
if ret < 0 {
return 0, RBDError(ret)
}
image.offset += int64(ret)
if ret < len(data) {
return ret, io.EOF
}
return ret, nil
}
// ssize_t rbd_write(rbd_image_t image, uint64_t ofs, size_t len, const char *buf);
func (image *Image) Write(data []byte) (n int, err error) {
if err := image.validate(imageIsOpen); err != nil {
return 0, err
}
ret := int(C.rbd_write(image.image, C.uint64_t(image.offset),
C.size_t(len(data)), (*C.char)(unsafe.Pointer(&data[0]))))
if ret >= 0 {
image.offset += int64(ret)
}
if ret != len(data) {
err = RBDError(-C.EPERM)
}
return ret, err
}
func (image *Image) Seek(offset int64, whence int) (int64, error) {
switch whence {
case SeekSet:
image.offset = offset
case SeekCur:
image.offset += offset
case SeekEnd:
stats, err := image.Stat()
if err != nil {
return 0, err
}
image.offset = int64(stats.Size) - offset
default:
return 0, errors.New("Wrong value for whence")
}
return image.offset, nil
}
// int rbd_discard(rbd_image_t image, uint64_t ofs, uint64_t len);
func (image *Image) Discard(ofs uint64, length uint64) (int, error) {
if err := image.validate(imageIsOpen); err != nil {
return 0, err
}
ret := C.rbd_discard(image.image, C.uint64_t(ofs), C.uint64_t(length))
if ret < 0 {
return 0, RBDError(ret)
}
return int(ret), nil
}
func (image *Image) ReadAt(data []byte, off int64) (int, error) {
if err := image.validate(imageIsOpen); err != nil {
return 0, err
}
if len(data) == 0 {
return 0, nil
}
ret := int(C.rbd_read(
image.image,
(C.uint64_t)(off),
(C.size_t)(len(data)),
(*C.char)(unsafe.Pointer(&data[0]))))
if ret < 0 {
return 0, RBDError(ret)
}
if ret < len(data) {
return ret, io.EOF
}
return ret, nil
}
func (image *Image) WriteAt(data []byte, off int64) (n int, err error) {
if err := image.validate(imageIsOpen); err != nil {
return 0, err
}
if len(data) == 0 {
return 0, nil
}
ret := int(C.rbd_write(image.image, C.uint64_t(off),
C.size_t(len(data)), (*C.char)(unsafe.Pointer(&data[0]))))
if ret != len(data) {
err = RBDError(-C.EPERM)
}
return ret, err
}
// int rbd_flush(rbd_image_t image);
func (image *Image) Flush() error {
if err := image.validate(imageIsOpen); err != nil {
return err
}
return getError(C.rbd_flush(image.image))
}
// int rbd_snap_list(rbd_image_t image, rbd_snap_info_t *snaps, int *max_snaps);
// void rbd_snap_list_end(rbd_snap_info_t *snaps);
func (image *Image) GetSnapshotNames() (snaps []SnapInfo, err error) {
if err := image.validate(imageIsOpen); err != nil {
return nil, err
}
var c_max_snaps C.int
ret := C.rbd_snap_list(image.image, nil, &c_max_snaps)
c_snaps := make([]C.rbd_snap_info_t, c_max_snaps)
snaps = make([]SnapInfo, c_max_snaps)
ret = C.rbd_snap_list(image.image,
&c_snaps[0], &c_max_snaps)
if ret < 0 {
return nil, RBDError(ret)
}
for i, s := range c_snaps {
snaps[i] = SnapInfo{Id: uint64(s.id),
Size: uint64(s.size),
Name: C.GoString(s.name)}
}
C.rbd_snap_list_end(&c_snaps[0])
return snaps[:len(snaps)-1], nil
}
// int rbd_snap_create(rbd_image_t image, const char *snapname);
func (image *Image) CreateSnapshot(snapname string) (*Snapshot, error) {
if err := image.validate(imageIsOpen); err != nil {
return nil, err
}
c_snapname := C.CString(snapname)
defer C.free(unsafe.Pointer(c_snapname))
ret := C.rbd_snap_create(image.image, c_snapname)
if ret < 0 {
return nil, RBDError(ret)
}
return &Snapshot{
image: image,
name: snapname,
}, nil
}
//
func (image *Image) GetSnapshot(snapname string) *Snapshot {
return &Snapshot{
image: image,
name: snapname,
}
}
// int rbd_metadata_get(rbd_image_t image, const char *key, char *value, size_t *vallen)
func (image *Image) GetMetadata(key string) (string, error) {
if err := image.validate(imageIsOpen); err != nil {
return "", err
}
c_key := C.CString(key)
defer C.free(unsafe.Pointer(c_key))
var c_vallen C.size_t
ret := C.rbd_metadata_get(image.image, c_key, nil, (*C.size_t)(&c_vallen))
// get size of value
// ret -34 because we pass nil as value pointer
if ret != 0 && ret != -C.ERANGE {
return "", RBDError(ret)
}
// make a bytes array with a good size
value := make([]byte, c_vallen-1)
ret = C.rbd_metadata_get(image.image, c_key, (*C.char)(unsafe.Pointer(&value[0])), (*C.size_t)(&c_vallen))
if ret < 0 {
return "", RBDError(ret)
}
return string(value), nil
}
// int rbd_metadata_set(rbd_image_t image, const char *key, const char *value)
func (image *Image) SetMetadata(key string, value string) error {
if err := image.validate(imageIsOpen); err != nil {
return err
}
c_key := C.CString(key)
c_value := C.CString(value)
defer C.free(unsafe.Pointer(c_key))
defer C.free(unsafe.Pointer(c_value))
ret := C.rbd_metadata_set(image.image, c_key, c_value)
if ret < 0 {
return RBDError(ret)
}
return nil
}
// int rbd_metadata_remove(rbd_image_t image, const char *key)
func (image *Image) RemoveMetadata(key string) error {
if err := image.validate(imageIsOpen); err != nil {
return err
}
c_key := C.CString(key)
defer C.free(unsafe.Pointer(c_key))
ret := C.rbd_metadata_remove(image.image, c_key)
if ret < 0 {
return RBDError(ret)
}
return nil
}
// GetId returns the internal image ID string.
//
// Implements:
// int rbd_get_id(rbd_image_t image, char *id, size_t id_len);
func (image *Image) GetId() (string, error) {
if err := image.validate(imageIsOpen); err != nil {
return "", err
}
size := C.size_t(1024)
buf := make([]byte, size)
for {
ret := C.rbd_get_id(
image.image,
(*C.char)(unsafe.Pointer(&buf[0])),
size)
if ret == -C.ERANGE && size <= 8192 {
size *= 2
buf = make([]byte, size)
} else if ret < 0 {
return "", getError(ret)
}
id := C.GoString((*C.char)(unsafe.Pointer(&buf[0])))
return id, nil
}
}
// int rbd_snap_remove(rbd_image_t image, const char *snapname);
func (snapshot *Snapshot) Remove() error {
if err := snapshot.validate(snapshotNeedsName | imageIsOpen); err != nil {
return err
}
c_snapname := C.CString(snapshot.name)
defer C.free(unsafe.Pointer(c_snapname))
return getError(C.rbd_snap_remove(snapshot.image.image, c_snapname))
}
// int rbd_snap_rollback(rbd_image_t image, const char *snapname);
// int rbd_snap_rollback_with_progress(rbd_image_t image, const char *snapname,
// librbd_progress_fn_t cb, void *cbdata);
func (snapshot *Snapshot) Rollback() error {
if err := snapshot.validate(snapshotNeedsName | imageIsOpen); err != nil {
return err
}
c_snapname := C.CString(snapshot.name)
defer C.free(unsafe.Pointer(c_snapname))
return getError(C.rbd_snap_rollback(snapshot.image.image, c_snapname))
}
// int rbd_snap_protect(rbd_image_t image, const char *snap_name);
func (snapshot *Snapshot) Protect() error {
if err := snapshot.validate(snapshotNeedsName | imageIsOpen); err != nil {
return err
}
c_snapname := C.CString(snapshot.name)
defer C.free(unsafe.Pointer(c_snapname))
return getError(C.rbd_snap_protect(snapshot.image.image, c_snapname))
}
// int rbd_snap_unprotect(rbd_image_t image, const char *snap_name);
func (snapshot *Snapshot) Unprotect() error {
if err := snapshot.validate(snapshotNeedsName | imageIsOpen); err != nil {
return err
}
c_snapname := C.CString(snapshot.name)
defer C.free(unsafe.Pointer(c_snapname))
return getError(C.rbd_snap_unprotect(snapshot.image.image, c_snapname))
}
// int rbd_snap_is_protected(rbd_image_t image, const char *snap_name,
// int *is_protected);
func (snapshot *Snapshot) IsProtected() (bool, error) {
if err := snapshot.validate(snapshotNeedsName | imageIsOpen); err != nil {
return false, err
}
var c_is_protected C.int
c_snapname := C.CString(snapshot.name)
defer C.free(unsafe.Pointer(c_snapname))
ret := C.rbd_snap_is_protected(snapshot.image.image, c_snapname,
&c_is_protected)
if ret < 0 {
return false, RBDError(ret)
}
return c_is_protected != 0, nil
}
// int rbd_snap_set(rbd_image_t image, const char *snapname);
func (snapshot *Snapshot) Set() error {
if err := snapshot.validate(snapshotNeedsName | imageIsOpen); err != nil {
return err
}
c_snapname := C.CString(snapshot.name)
defer C.free(unsafe.Pointer(c_snapname))
return getError(C.rbd_snap_set(snapshot.image.image, c_snapname))
}
// GetTrashList returns a slice of TrashInfo structs, containing information about all RBD images
// currently residing in the trash.
func GetTrashList(ioctx *rados.IOContext) ([]TrashInfo, error) {
var num_entries C.size_t
// Call rbd_trash_list with nil pointer to get number of trash entries.
if C.rbd_trash_list(C.rados_ioctx_t(ioctx.Pointer()), nil, &num_entries); num_entries == 0 {
return nil, nil
}
c_entries := make([]C.rbd_trash_image_info_t, num_entries)
trashList := make([]TrashInfo, num_entries)
if ret := C.rbd_trash_list(C.rados_ioctx_t(ioctx.Pointer()), &c_entries[0], &num_entries); ret < 0 {
return nil, RBDError(ret)
}
for i, ti := range c_entries {
trashList[i] = TrashInfo{
Id: C.GoString(ti.id),
Name: C.GoString(ti.name),
DeletionTime: time.Unix(int64(ti.deletion_time), 0),
DefermentEndTime: time.Unix(int64(ti.deferment_end_time), 0),
}
}
// Free rbd_trash_image_info_t pointers
C.rbd_trash_list_cleanup(&c_entries[0], num_entries)
return trashList, nil
}
// TrashRemove permanently deletes the trashed RBD with the specified id.
func TrashRemove(ioctx *rados.IOContext, id string, force bool) error {
c_id := C.CString(id)
defer C.free(unsafe.Pointer(c_id))
return getError(C.rbd_trash_remove(C.rados_ioctx_t(ioctx.Pointer()), c_id, C.bool(force)))
}
// TrashRestore restores the trashed RBD with the specified id back to the pool from whence it
// came, with the specified new name.
func TrashRestore(ioctx *rados.IOContext, id, name string) error {
c_id := C.CString(id)
c_name := C.CString(name)
defer C.free(unsafe.Pointer(c_id))
defer C.free(unsafe.Pointer(c_name))
return getError(C.rbd_trash_restore(C.rados_ioctx_t(ioctx.Pointer()), c_id, c_name))
}
// OpenImage will open an existing rbd image by name and snapshot name,
// returning a new opened image. Pass the NoSnapshot sentinel value as the
// snapName to explicitly indicate that no snapshot name is being provided.
//
// Implements:
// int rbd_open(rados_ioctx_t io, const char *name,
// rbd_image_t *image, const char *snap_name);
func OpenImage(ioctx *rados.IOContext, name, snapName string) (*Image, error) {
cName := C.CString(name)
defer C.free(unsafe.Pointer(cName))
var cSnapName *C.char
if snapName != NoSnapshot {
cSnapName = C.CString(snapName)
defer C.free(unsafe.Pointer(cSnapName))
}
var cImage C.rbd_image_t
ret := C.rbd_open(
C.rados_ioctx_t(ioctx.Pointer()),
cName,
&cImage,
cSnapName)
if ret != 0 {
return nil, getError(ret)
}
return &Image{
ioctx: ioctx,
name: name,
image: cImage,
}, nil
}
// OpenImageReadOnly will open an existing rbd image by name and snapshot name,
// returning a new opened-for-read image. Pass the NoSnapshot sentinel value
// as the snapName to explicitly indicate that no snapshot name is being
// provided.
//
// Implements:
// int rbd_open_read_only(rados_ioctx_t io, const char *name,
// rbd_image_t *image, const char *snap_name);
func OpenImageReadOnly(ioctx *rados.IOContext, name, snapName string) (*Image, error) {
cName := C.CString(name)
defer C.free(unsafe.Pointer(cName))
var cSnapName *C.char
if snapName != NoSnapshot {
cSnapName = C.CString(snapName)
defer C.free(unsafe.Pointer(cSnapName))
}
var cImage C.rbd_image_t
ret := C.rbd_open_read_only(
C.rados_ioctx_t(ioctx.Pointer()),
cName,
&cImage,
cSnapName)
if ret != 0 {
return nil, getError(ret)
}
return &Image{
ioctx: ioctx,
name: name,
image: cImage,
}, nil
}
// OpenImageById will open an existing rbd image by ID and snapshot name,
// returning a new opened image. Pass the NoSnapshot sentinel value as the
// snapName to explicitly indicate that no snapshot name is being provided.
// Error handling will fail & segfault unless compiled with a version of ceph
// that fixes https://tracker.ceph.com/issues/43178
//
// Implements:
// int rbd_open_by_id(rados_ioctx_t io, const char *id,
// rbd_image_t *image, const char *snap_name);
func OpenImageById(ioctx *rados.IOContext, id, snapName string) (*Image, error) {
cid := C.CString(id)
defer C.free(unsafe.Pointer(cid))
var cSnapName *C.char
if snapName != NoSnapshot {
cSnapName = C.CString(snapName)
defer C.free(unsafe.Pointer(cSnapName))
}
var cImage C.rbd_image_t
ret := C.rbd_open_by_id(
C.rados_ioctx_t(ioctx.Pointer()),
cid,
&cImage,
cSnapName)
if ret != 0 {
return nil, getError(ret)
}
return &Image{
ioctx: ioctx,
image: cImage,
}, nil
}
// OpenImageByIdReadOnly will open an existing rbd image by ID and snapshot
// name, returning a new opened-for-read image. Pass the NoSnapshot sentinel
// value as the snapName to explicitly indicate that no snapshot name is being
// provided.
// Error handling will fail & segfault unless compiled with a version of ceph
// that fixes https://tracker.ceph.com/issues/43178
//
// Implements:
// int rbd_open_by_id_read_only(rados_ioctx_t io, const char *id,
// rbd_image_t *image, const char *snap_name);
func OpenImageByIdReadOnly(ioctx *rados.IOContext, id, snapName string) (*Image, error) {
cid := C.CString(id)
defer C.free(unsafe.Pointer(cid))
var cSnapName *C.char
if snapName != NoSnapshot {
cSnapName = C.CString(snapName)
defer C.free(unsafe.Pointer(cSnapName))
}
var cImage C.rbd_image_t
ret := C.rbd_open_by_id_read_only(
C.rados_ioctx_t(ioctx.Pointer()),
cid,
&cImage,
cSnapName)
if ret != 0 {
return nil, getError(ret)
}
return &Image{
ioctx: ioctx,
image: cImage,
}, nil
}
// CreateImage creates a new rbd image using provided image options.
//
// Implements:
// int rbd_create4(rados_ioctx_t io, const char *name, uint64_t size,
// rbd_image_options_t opts);
func CreateImage(ioctx *rados.IOContext, name string, size uint64, rio *RbdImageOptions) error {
if rio == nil {
return RBDError(C.EINVAL)
}
c_name := C.CString(name)
defer C.free(unsafe.Pointer(c_name))
ret := C.rbd_create4(C.rados_ioctx_t(ioctx.Pointer()), c_name,
C.uint64_t(size), C.rbd_image_options_t(rio.options))
return getError(ret)
}
// RemoveImage removes the specified rbd image.
//
// Implements:
// int rbd_remove(rados_ioctx_t io, const char *name);
func RemoveImage(ioctx *rados.IOContext, name string) error {
c_name := C.CString(name)
defer C.free(unsafe.Pointer(c_name))
return getError(C.rbd_remove(C.rados_ioctx_t(ioctx.Pointer()), c_name))
}
// CloneImage creates a clone of the image from the named snapshot in the
// provided io-context with the given name and image options.
//
// Implements:
// int rbd_clone3(rados_ioctx_t p_ioctx, const char *p_name,
// const char *p_snapname, rados_ioctx_t c_ioctx,
// const char *c_name, rbd_image_options_t c_opts);
func CloneImage(ioctx *rados.IOContext, parentName, snapName string,
destctx *rados.IOContext, name string, rio *RbdImageOptions) error {
if rio == nil {
return RBDError(C.EINVAL)
}
cParentName := C.CString(parentName)
defer C.free(unsafe.Pointer(cParentName))
cParentSnapName := C.CString(snapName)
defer C.free(unsafe.Pointer(cParentSnapName))
cCloneName := C.CString(name)
defer C.free(unsafe.Pointer(cCloneName))
ret := C.rbd_clone3(
C.rados_ioctx_t(ioctx.Pointer()),
cParentName,
cParentSnapName,
C.rados_ioctx_t(destctx.Pointer()),
cCloneName,
C.rbd_image_options_t(rio.options))
return getError(ret)
}
// CloneFromImage creates a clone of the image from the named snapshot in the
// provided io-context with the given name and image options.
// This function is a convenience wrapper around CloneImage to support cloning
// from an existing Image.
func CloneFromImage(parent *Image, snapName string,
destctx *rados.IOContext, name string, rio *RbdImageOptions) error {
if err := parent.validate(imageNeedsIOContext); err != nil {
return err
}
return CloneImage(parent.ioctx, parent.name, snapName, destctx, name, rio)
}