go-ceph/rbd/snapshot_octopus.go

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//go:build !nautilus
// +build !nautilus
package rbd
// #cgo LDFLAGS: -lrbd
// #include <stdlib.h>
// #include <rbd/librbd.h>
import "C"
import (
"unsafe"
"github.com/ceph/go-ceph/internal/retry"
)
// GetSnapID returns the snapshot ID for the given snapshot name.
//
// Implements:
//
// int rbd_snap_get_id(rbd_image_t image, const char *snapname, uint64_t *snap_id)
func (image *Image) GetSnapID(snapName string) (uint64, error) {
var snapID C.uint64_t
if err := image.validate(imageIsOpen); err != nil {
return uint64(snapID), err
}
if snapName == "" {
return uint64(snapID), ErrSnapshotNoName
}
cSnapName := C.CString(snapName)
defer C.free(unsafe.Pointer(cSnapName))
ret := C.rbd_snap_get_id(image.image, cSnapName, &snapID)
return uint64(snapID), getError(ret)
}
// GetSnapByID returns the snapshot name for the given snapshot ID.
//
// Implements:
//
// int rbd_snap_get_name(rbd_image_t image, uint64_t snap_id, char *snapname, size_t *name_len)
func (image *Image) GetSnapByID(snapID uint64) (string, error) {
if err := image.validate(imageIsOpen); err != nil {
return "", err
}
var (
buf []byte
err error
)
// range from 1k to 64KiB
retry.WithSizes(1024, 1<<16, func(len int) retry.Hint {
cLen := C.size_t(len)
buf = make([]byte, cLen)
ret := C.rbd_snap_get_name(
image.image,
(C.uint64_t)(snapID),
(*C.char)(unsafe.Pointer(&buf[0])),
&cLen)
err = getError(ret)
return retry.Size(int(cLen)).If(err == errRange)
})
if err != nil {
return "", err
}
return C.GoString((*C.char)(unsafe.Pointer(&buf[0]))), nil
}