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 (
"unsafe"
"github.com/ceph/go-ceph/internal/retry"
"github.com/ceph/go-ceph/rados"
)
// GetImageNames returns the list of current RBD images.
func GetImageNames(ioctx *rados.IOContext) ([]string, error) {
var (
err error
images []C.rbd_image_spec_t
size C.size_t
)
retry.WithSizes(32, 4096, func(s int) retry.Hint {
size = C.size_t(s)
images = make([]C.rbd_image_spec_t, size)
ret := C.rbd_list2(
cephIoctx(ioctx),
(*C.rbd_image_spec_t)(unsafe.Pointer(&images[0])),
&size)
err = getErrorIfNegative(ret)
return retry.Size(int(size)).If(err == errRange)
})
if err != nil {
return nil, err
}
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[:size] {
names[i] = C.GoString(image.name)
}
return names, nil
}