go-ceph/rbd/rbd_nautilus.go
Sanford Miller 133e675c8d rbd: refactor GetImageNames to use a for loop instead of recursion
This is done because using a for loop is more idiomatic in Go code.

Signed-off-by: Sanford Miller <smiller@digitalocean.com>
2022-06-14 16:33:29 +00:00

115 lines
3.0 KiB
Go

//
// Ceph Nautilus is the first release that includes rbd_list2() and
// rbd_get_create_timestamp().
package rbd
// #cgo LDFLAGS: -lrbd
// #include <rados/librados.h>
// #include <rbd/librbd.h>
// #include <errno.h>
import "C"
import (
"unsafe"
ts "github.com/ceph/go-ceph/internal/timespec"
"github.com/ceph/go-ceph/rados"
)
// GetImageNames returns the list of current RBD images.
func GetImageNames(ioctx *rados.IOContext) ([]string, error) {
var images []C.rbd_image_spec_t
size := C.size_t(4096)
for {
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)
if err != nil {
if err == errRange {
continue
}
return nil, err
}
break
}
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
}
// GetCreateTimestamp returns the time the rbd image was created.
//
// Implements:
// int rbd_get_create_timestamp(rbd_image_t image, struct timespec *timestamp);
func (image *Image) GetCreateTimestamp() (Timespec, error) {
if err := image.validate(imageIsOpen); err != nil {
return Timespec{}, err
}
var cts C.struct_timespec
if ret := C.rbd_get_create_timestamp(image.image, &cts); ret < 0 {
return Timespec{}, getError(ret)
}
return Timespec(ts.CStructToTimespec(ts.CTimespecPtr(&cts))), nil
}
// GetAccessTimestamp returns the time the rbd image was last accessed.
//
// Implements:
// int rbd_get_access_timestamp(rbd_image_t image, struct timespec *timestamp);
func (image *Image) GetAccessTimestamp() (Timespec, error) {
if err := image.validate(imageIsOpen); err != nil {
return Timespec{}, err
}
var cts C.struct_timespec
if ret := C.rbd_get_access_timestamp(image.image, &cts); ret < 0 {
return Timespec{}, getError(ret)
}
return Timespec(ts.CStructToTimespec(ts.CTimespecPtr(&cts))), nil
}
// GetModifyTimestamp returns the time the rbd image was last modified.
//
// Implements:
// int rbd_get_modify_timestamp(rbd_image_t image, struct timespec *timestamp);
func (image *Image) GetModifyTimestamp() (Timespec, error) {
if err := image.validate(imageIsOpen); err != nil {
return Timespec{}, err
}
var cts C.struct_timespec
if ret := C.rbd_get_modify_timestamp(image.image, &cts); ret < 0 {
return Timespec{}, getError(ret)
}
return Timespec(ts.CStructToTimespec(ts.CTimespecPtr(&cts))), nil
}
// Sparsify makes an image sparse by deallocating runs of zeros.
// The sparseSize value will be used to find runs of zeros and must be
// a power of two no less than 4096 and no larger than the image size.
//
// Implements:
// int rbd_sparsify(rbd_image_t image, size_t sparse_size);
func (image *Image) Sparsify(sparseSize uint) error {
if err := image.validate(imageIsOpen); err != nil {
return err
}
return getError(C.rbd_sparsify(image.image, C.size_t(sparseSize)))
}