go-ceph/rbd/rbd_nautilus.go

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// +build !luminous,!mimic
//
// Ceph Nautilus is the first release that includes rbd_list2().
package rbd
// #cgo LDFLAGS: -lrbd
// #include <rados/librados.h>
// #include <rbd/librbd.h>
// #include <errno.h>
import "C"
import (
"fmt"
"unsafe"
"github.com/ceph/go-ceph/rados"
)
// GetImageNames returns the list of current RBD images.
func GetImageNames(ioctx *rados.IOContext) ([]string, error) {
size := C.size_t(0)
ret := C.rbd_list2(cephIoctx(ioctx), nil, &size)
if ret < 0 && ret != -C.ERANGE {
return nil, RBDError(ret)
} else if ret > 0 {
return nil, fmt.Errorf("rbd_list2() returned %d names, expected 0", ret)
} else if ret == 0 && size == 0 {
return nil, nil
}
// expected: ret == -ERANGE, size contains number of image names
images := make([]C.rbd_image_spec_t, size)
ret = C.rbd_list2(cephIoctx(ioctx), (*C.rbd_image_spec_t)(unsafe.Pointer(&images[0])), &size)
if ret < 0 {
return nil, RBDError(ret)
}
defer C.rbd_image_spec_list_cleanup((*C.rbd_image_spec_t)(unsafe.Pointer(&images[0])), size)
names := make([]string, size)
for i, image := range images {
names[i] = C.GoString(image.name)
}
return names, nil
}