go-ceph/rbd/snapshot_nautilus.go

107 lines
2.9 KiB
Go

// +build !luminous,!mimic
//
// Ceph Nautilus introduced rbd_get_parent() and deprecated rbd_get_parent_info().
// Ceph Nautilus introduced rbd_list_children3() and deprecated rbd_list_children().
package rbd
// #cgo LDFLAGS: -lrbd
// #include <rbd/librbd.h>
// #include <errno.h>
import "C"
import (
"unsafe"
"github.com/ceph/go-ceph/internal/retry"
)
// GetParentInfo looks for the parent of the image and stores the pool, name
// and snapshot-name in the byte-arrays that are passed as arguments.
//
// Implements:
// int rbd_get_parent(rbd_image_t image,
// rbd_linked_image_spec_t *parent_image,
// rbd_snap_spec_t *parent_snap)
func (image *Image) GetParentInfo(pool, name, snapname []byte) error {
if err := image.validate(imageIsOpen); err != nil {
return err
}
parentImage := C.rbd_linked_image_spec_t{}
parentSnap := C.rbd_snap_spec_t{}
ret := C.rbd_get_parent(image.image, &parentImage, &parentSnap)
if ret != 0 {
return rbdError(ret)
}
defer C.rbd_linked_image_spec_cleanup(&parentImage)
defer C.rbd_snap_spec_cleanup(&parentSnap)
strlen := int(C.strlen(parentImage.pool_name))
if len(pool) < strlen {
return rbdError(C.ERANGE)
}
if copy(pool, C.GoString(parentImage.pool_name)) != strlen {
return rbdError(C.ERANGE)
}
strlen = int(C.strlen(parentImage.image_name))
if len(name) < strlen {
return rbdError(C.ERANGE)
}
if copy(name, C.GoString(parentImage.image_name)) != strlen {
return rbdError(C.ERANGE)
}
strlen = int(C.strlen(parentSnap.name))
if len(snapname) < strlen {
return rbdError(C.ERANGE)
}
if copy(snapname, C.GoString(parentSnap.name)) != strlen {
return rbdError(C.ERANGE)
}
return nil
}
// ListChildren returns arrays with the pools and names of the images that are
// children of the given image. The index of the pools and images arrays can be
// used to link the two items together.
//
// Implements:
// int rbd_list_children3(rbd_image_t image, rbd_linked_image_spec_t *images,
// size_t *max_images);
func (image *Image) ListChildren() (pools []string, images []string, err error) {
if err := image.validate(imageIsOpen); err != nil {
return nil, nil, err
}
var (
csize C.size_t
children []C.rbd_linked_image_spec_t
)
retry.WithSizes(16, 4096, func(size int) retry.Hint {
csize = C.size_t(size)
children = make([]C.rbd_linked_image_spec_t, csize)
ret := C.rbd_list_children3(
image.image,
(*C.rbd_linked_image_spec_t)(unsafe.Pointer(&children[0])),
&csize)
err = getErrorIfNegative(ret)
return retry.Size(int(csize)).If(err == errRange)
})
if err != nil {
return nil, nil, err
}
defer C.rbd_linked_image_spec_list_cleanup((*C.rbd_linked_image_spec_t)(unsafe.Pointer(&children[0])), csize)
pools = make([]string, csize)
images = make([]string, csize)
for i, child := range children[:csize] {
pools[i] = C.GoString(child.pool_name)
images[i] = C.GoString(child.image_name)
}
return pools, images, nil
}