mirror of https://github.com/ceph/go-ceph
72 lines
2.0 KiB
Go
72 lines
2.0 KiB
Go
// +build !luminous,!mimic
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package admin
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var (
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listVolumesCmd = []byte(`{"prefix":"fs volume ls"}`)
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dumpVolumesCmd = []byte(`{"prefix":"fs dump","format":"json"}`)
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)
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// ListVolumes return a list of volumes in this Ceph cluster.
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//
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// Similar To:
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// ceph fs volume ls
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func (fsa *FSAdmin) ListVolumes() ([]string, error) {
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res := fsa.rawMgrCommand(listVolumesCmd)
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return parseListNames(res)
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}
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// VolumeIdent contains a pair of file system identifying values: the volume
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// name and the volume ID.
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type VolumeIdent struct {
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Name string
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ID int64
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}
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type cephFileSystem struct {
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ID int64 `json:"id"`
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MDSMap struct {
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FSName string `json:"fs_name"`
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} `json:"mdsmap"`
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}
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type fsDump struct {
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FileSystems []cephFileSystem `json:"filesystems"`
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}
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const (
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dumpOkPrefix = "dumped fsmap epoch"
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dumpOkLen = len(dumpOkPrefix)
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)
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func parseDumpToIdents(res response) ([]VolumeIdent, error) {
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if !res.Ok() {
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return nil, res.End()
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}
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if len(res.status) >= dumpOkLen && res.status[:dumpOkLen] == dumpOkPrefix {
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// Unhelpfully, ceph drops a status string on success responses for this
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// call. this hacks around that by ignoring its typical prefix
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res.status = ""
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}
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var dump fsDump
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if err := res.noStatus().unmarshal(&dump).End(); err != nil {
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return nil, err
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}
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// copy the dump json into the simpler enumeration list
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idents := make([]VolumeIdent, len(dump.FileSystems))
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for i := range dump.FileSystems {
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idents[i].ID = dump.FileSystems[i].ID
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idents[i].Name = dump.FileSystems[i].MDSMap.FSName
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}
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return idents, nil
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}
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// EnumerateVolumes returns a list of volume-name volume-id pairs.
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func (fsa *FSAdmin) EnumerateVolumes() ([]VolumeIdent, error) {
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// We base our enumeration on the ceph fs dump json. This may not be the
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// only way to do it, but it's the only one I know of currently. Because of
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// this and to keep our initial implementation simple, we expose our own
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// simplified type only, rather do a partial implementation of dump.
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return parseDumpToIdents(fsa.rawMonCommand(dumpVolumesCmd))
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}
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