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772d1dfa77
v0.3.0 adds support for rbd.FeatureSet that can be used to parse the features of an RBD image. This will be used in the followup commit that adds rbdVolume.getImageInfo(). Signed-off-by: Niels de Vos <ndevos@redhat.com>
58 lines
1.5 KiB
Go
58 lines
1.5 KiB
Go
// +build !luminous
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//
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// Ceph Mimic is the first version that supports watchers through librbd.
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package rbd
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// #cgo LDFLAGS: -lrbd
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// #include <errno.h>
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// #include <rbd/librbd.h>
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import "C"
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// ImageWatcher is a representation of the rbd_image_watcher_t from librbd.h
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type ImageWatcher struct {
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Addr string
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Id int64
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Cookie uint64
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}
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// ListWatchers returns the watchers on an RBD image. In case of an error, nil
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// and an error are returned.
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//
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// Note:
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// Only supported in Ceph Mimic and newer.
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//
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// Implements:
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// int rbd_watchers_list(rbd_image_t image,
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// rbd_image_watcher_t *watchers, size_t *max_watchers)
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func (image *Image) ListWatchers() ([]ImageWatcher, error) {
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if err := image.validate(imageIsOpen); err != nil {
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return nil, err
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}
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count := C.ulong(0)
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ret := C.rbd_watchers_list(image.image, nil, &count)
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if ret != 0 && ret != -C.ERANGE {
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return nil, getError(ret)
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}
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if ret == 0 && count == 0 {
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return nil, nil
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}
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watchers := make([]C.rbd_image_watcher_t, count)
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ret = C.rbd_watchers_list(image.image, &watchers[0], &count)
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if ret != 0 && ret != -C.ERANGE {
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return nil, getError(ret)
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}
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defer C.rbd_watchers_list_cleanup(&watchers[0], count)
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imageWatchers := make([]ImageWatcher, len(watchers))
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for i, watcher := range watchers {
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imageWatchers[i].Addr = C.GoString(watcher.addr)
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imageWatchers[i].Id = int64(watcher.id)
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imageWatchers[i].Cookie = uint64(watcher.cookie)
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}
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return imageWatchers, nil
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}
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