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https://github.com/ceph/go-ceph
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dbf20aea0a
The sparsify function can be used to make an image sparse by replacing runs of zeros with holes. This change adds a wrapper for the basic rbd_sparsify function and accompanying tests. Signed-off-by: John Mulligan <jmulligan@redhat.com>
118 lines
3.1 KiB
Go
118 lines
3.1 KiB
Go
// +build !luminous,!mimic
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//
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// Ceph Nautilus is the first release that includes rbd_list2() and
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// rbd_get_create_timestamp().
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package rbd
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// #cgo LDFLAGS: -lrbd
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// #include <rados/librados.h>
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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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"unsafe"
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"github.com/ceph/go-ceph/internal/retry"
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ts "github.com/ceph/go-ceph/internal/timespec"
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"github.com/ceph/go-ceph/rados"
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)
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// GetImageNames returns the list of current RBD images.
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func GetImageNames(ioctx *rados.IOContext) ([]string, error) {
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var (
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err error
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images []C.rbd_image_spec_t
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size C.size_t
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)
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retry.WithSizes(32, 4096, func(s int) retry.Hint {
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size = C.size_t(s)
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images = make([]C.rbd_image_spec_t, size)
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ret := C.rbd_list2(
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cephIoctx(ioctx),
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(*C.rbd_image_spec_t)(unsafe.Pointer(&images[0])),
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&size)
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err = getErrorIfNegative(ret)
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return retry.Size(int(size)).If(err == errRange)
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})
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if err != nil {
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return nil, err
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}
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defer C.rbd_image_spec_list_cleanup((*C.rbd_image_spec_t)(unsafe.Pointer(&images[0])), size)
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names := make([]string, size)
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for i, image := range images[:size] {
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names[i] = C.GoString(image.name)
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}
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return names, nil
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}
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// GetCreateTimestamp returns the time the rbd image was created.
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//
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// Implements:
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// int rbd_get_create_timestamp(rbd_image_t image, struct timespec *timestamp);
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func (image *Image) GetCreateTimestamp() (Timespec, error) {
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if err := image.validate(imageIsOpen); err != nil {
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return Timespec{}, err
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}
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var cts C.struct_timespec
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if ret := C.rbd_get_create_timestamp(image.image, &cts); ret < 0 {
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return Timespec{}, getError(ret)
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}
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return Timespec(ts.CStructToTimespec(ts.CTimespecPtr(&cts))), nil
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}
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// GetAccessTimestamp returns the time the rbd image was last accessed.
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//
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// Implements:
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// int rbd_get_access_timestamp(rbd_image_t image, struct timespec *timestamp);
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func (image *Image) GetAccessTimestamp() (Timespec, error) {
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if err := image.validate(imageIsOpen); err != nil {
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return Timespec{}, err
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}
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var cts C.struct_timespec
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if ret := C.rbd_get_access_timestamp(image.image, &cts); ret < 0 {
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return Timespec{}, getError(ret)
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}
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return Timespec(ts.CStructToTimespec(ts.CTimespecPtr(&cts))), nil
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}
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// GetModifyTimestamp returns the time the rbd image was last modified.
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//
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// Implements:
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// int rbd_get_modify_timestamp(rbd_image_t image, struct timespec *timestamp);
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func (image *Image) GetModifyTimestamp() (Timespec, error) {
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if err := image.validate(imageIsOpen); err != nil {
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return Timespec{}, err
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}
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var cts C.struct_timespec
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if ret := C.rbd_get_modify_timestamp(image.image, &cts); ret < 0 {
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return Timespec{}, getError(ret)
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}
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return Timespec(ts.CStructToTimespec(ts.CTimespecPtr(&cts))), nil
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}
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// Sparsify makes an image sparse by deallocating runs of zeros.
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// The sparseSize value will be used to find runs of zeros and must be
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// a power of two no less than 4096 and no larger than the image size.
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//
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// Implements:
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// int rbd_sparsify(rbd_image_t image, size_t sparse_size);
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func (image *Image) Sparsify(sparseSize uint) 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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return getError(C.rbd_sparsify(image.image, C.size_t(sparseSize)))
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}
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