mirror of
https://github.com/ceph/ceph-csi.git
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105 lines
3.0 KiB
Go
105 lines
3.0 KiB
Go
// +build !luminous,!mimic
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//
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// Ceph Nautilus introduced rbd_get_parent() and deprecated rbd_get_parent_info().
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// Ceph Nautilus introduced rbd_list_children3() and deprecated rbd_list_children().
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package rbd
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// #cgo LDFLAGS: -lrbd
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// #include <rbd/librbd.h>
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// #include <errno.h>
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import "C"
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import (
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"fmt"
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"unsafe"
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)
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// GetParentInfo looks for the parent of the image and stores the pool, name
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// and snapshot-name in the byte-arrays that are passed as arguments.
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//
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// Implements:
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// int rbd_get_parent(rbd_image_t image,
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// rbd_linked_image_spec_t *parent_image,
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// rbd_snap_spec_t *parent_snap)
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func (image *Image) GetParentInfo(pool, name, snapname []byte) error {
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if err := image.validate(imageIsOpen); err != nil {
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return err
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}
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parentImage := C.rbd_linked_image_spec_t{}
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parentSnap := C.rbd_snap_spec_t{}
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ret := C.rbd_get_parent(image.image, &parentImage, &parentSnap)
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if ret != 0 {
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return RBDError(ret)
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}
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defer C.rbd_linked_image_spec_cleanup(&parentImage)
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defer C.rbd_snap_spec_cleanup(&parentSnap)
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strlen := int(C.strlen(parentImage.pool_name))
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if len(pool) < strlen {
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return RBDError(C.ERANGE)
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}
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if copy(pool, C.GoString(parentImage.pool_name)) != strlen {
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return RBDError(C.ERANGE)
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}
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strlen = int(C.strlen(parentImage.image_name))
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if len(name) < strlen {
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return RBDError(C.ERANGE)
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}
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if copy(name, C.GoString(parentImage.image_name)) != strlen {
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return RBDError(C.ERANGE)
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}
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strlen = int(C.strlen(parentSnap.name))
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if len(snapname) < strlen {
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return RBDError(C.ERANGE)
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}
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if copy(snapname, C.GoString(parentSnap.name)) != strlen {
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return RBDError(C.ERANGE)
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}
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return nil
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}
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// ListChildren returns arrays with the pools and names of the images that are
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// children of the given image. The index of the pools and images arrays can be
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// used to link the two items together.
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//
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// Implements:
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// int rbd_list_children3(rbd_image_t image, rbd_linked_image_spec_t *images,
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// size_t *max_images);
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func (image *Image) ListChildren() (pools []string, images []string, err error) {
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if err := image.validate(imageIsOpen); err != nil {
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return nil, nil, err
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}
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size := C.size_t(0)
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ret := C.rbd_list_children3(image.image, nil, &size)
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if ret < 0 && ret != -C.ERANGE {
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return nil, nil, RBDError(ret)
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} else if ret > 0 {
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return nil, nil, fmt.Errorf("rbd_list_children3() returned %d, expected 0", ret)
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} else if ret == 0 && size == 0 {
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return nil, nil, nil
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}
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// expected: ret == -ERANGE, size contains number of image names
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children := make([]C.rbd_linked_image_spec_t, size)
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ret = C.rbd_list_children3(image.image, (*C.rbd_linked_image_spec_t)(unsafe.Pointer(&children[0])), &size)
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if ret < 0 {
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return nil, nil, RBDError(ret)
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}
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defer C.rbd_linked_image_spec_list_cleanup((*C.rbd_linked_image_spec_t)(unsafe.Pointer(&children[0])), size)
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pools = make([]string, size)
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images = make([]string, size)
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for i, child := range children {
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pools[i] = C.GoString(child.pool_name)
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images[i] = C.GoString(child.image_name)
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}
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return pools, images, nil
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}
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