mirror of
https://github.com/ceph/go-ceph
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5964821ec0
Unless these apis are deprecated in the (far?) future it is safer to say "not nautilus" rather than explicitly tag all current and future ceph release codenames. Signed-off-by: John Mulligan <jmulligan@redhat.com>
67 lines
1.5 KiB
Go
67 lines
1.5 KiB
Go
// +build !nautilus
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package rbd
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// #cgo LDFLAGS: -lrbd
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// #include <stdlib.h>
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// #include <rbd/librbd.h>
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import "C"
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import (
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"unsafe"
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"github.com/ceph/go-ceph/internal/retry"
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)
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// GetSnapID returns the snapshot ID for the given snapshot name.
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//
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// Implements:
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// int rbd_snap_get_id(rbd_image_t image, const char *snapname, uint64_t *snap_id)
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func (image *Image) GetSnapID(snapName string) (uint64, error) {
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var snapID C.uint64_t
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if err := image.validate(imageIsOpen); err != nil {
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return uint64(snapID), err
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}
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if snapName == "" {
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return uint64(snapID), ErrSnapshotNoName
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}
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cSnapName := C.CString(snapName)
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defer C.free(unsafe.Pointer(cSnapName))
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ret := C.rbd_snap_get_id(image.image, cSnapName, &snapID)
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return uint64(snapID), getError(ret)
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}
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// GetSnapByID returns the snapshot name for the given snapshot ID.
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//
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// Implements:
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// int rbd_snap_get_name(rbd_image_t image, uint64_t snap_id, char *snapname, size_t *name_len)
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func (image *Image) GetSnapByID(snapID uint64) (string, 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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var (
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buf []byte
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err error
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)
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// range from 1k to 64KiB
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retry.WithSizes(1024, 1<<16, func(len int) retry.Hint {
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cLen := C.size_t(len)
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buf = make([]byte, cLen)
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ret := C.rbd_snap_get_name(
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image.image,
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(C.uint64_t)(snapID),
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(*C.char)(unsafe.Pointer(&buf[0])),
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&cLen)
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err = getError(ret)
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return retry.Size(int(cLen)).If(err == errRange)
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})
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if err != nil {
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return "", err
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}
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return C.GoString((*C.char)(unsafe.Pointer(&buf[0]))), nil
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}
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