mirror of https://github.com/ceph/go-ceph
84 lines
2.3 KiB
Go
84 lines
2.3 KiB
Go
//go:build ceph_preview
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package rbd
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/*
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#cgo LDFLAGS: -lrbd
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#include <errno.h>
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#include <stdlib.h>
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#include <rados/librados.h>
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#include <rbd/librbd.h>
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// rbd_clone4_fn matches the rbd_clone4 function signature.
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typedef int(*rbd_clone4_fn)(rados_ioctx_t p_ioctx, const char *p_name,
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uint64_t p_snap_id, rados_ioctx_t c_ioctx,
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const char *c_name, rbd_image_options_t c_opts);
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// rbd_clone4_dlsym take *fn as rbd_clone4_fn and calls the dynamically loaded
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// rbd_clone4 function passed as 1st argument.
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static inline int rbd_clone4_dlsym(void *fn, rados_ioctx_t p_ioctx,
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const char *p_name, uint64_t p_snap_id,
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rados_ioctx_t c_ioctx, const char *c_name,
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rbd_image_options_t c_opts) {
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// cast function pointer fn to rbd_clone4 and call the function
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return ((rbd_clone4_fn) fn)(p_ioctx, p_name, p_snap_id, c_ioctx, c_name, c_opts);
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}
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*/
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import "C"
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import (
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"fmt"
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"sync"
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"unsafe"
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"github.com/ceph/go-ceph/internal/dlsym"
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"github.com/ceph/go-ceph/rados"
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)
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var (
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rbdClone4Once sync.Once
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rbdClone4 unsafe.Pointer
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rbdClone4Err error
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)
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// CloneImageByID creates a clone of the image from a snapshot with the given
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// ID in the provided io-context with the given name and image options.
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//
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// Implements:
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//
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// int rbd_clone4(rados_ioctx_t p_ioctx, const char *p_name,
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// uint64_t p_snap_id, rados_ioctx_t c_ioctx,
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// const char *c_name, rbd_image_options_t c_opts);
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func CloneImageByID(ioctx *rados.IOContext, parentName string, snapID uint64,
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destctx *rados.IOContext, name string, rio *ImageOptions) error {
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if rio == nil {
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return rbdError(C.EINVAL)
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}
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rbdClone4Once.Do(func() {
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rbdClone4, rbdClone4Err = dlsym.LookupSymbol("rbd_clone4")
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})
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if rbdClone4Err != nil {
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return fmt.Errorf("%w: %w", ErrNotImplemented, rbdClone4Err)
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}
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cParentName := C.CString(parentName)
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defer C.free(unsafe.Pointer(cParentName))
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cCloneName := C.CString(name)
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defer C.free(unsafe.Pointer(cCloneName))
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// call rbd_clone4_dlsym with the function pointer to rbd_clone4 as 1st
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// argument
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ret := C.rbd_clone4_dlsym(
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rbdClone4,
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cephIoctx(ioctx),
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cParentName,
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C.uint64_t(snapID),
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cephIoctx(destctx),
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cCloneName,
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C.rbd_image_options_t(rio.options))
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return getError(ret)
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}
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