package rbd // #cgo LDFLAGS: -lrbd // /* force XSI-complaint strerror_r() */ // #define _POSIX_C_SOURCE 200112L // #undef _GNU_SOURCE // #include // #include // #include // #include // #include 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) }