Function ParseStats

xfs/parse.go:27–196

ParseStats parses a Stats from an input io.Reader, using the format found in /proc/fs/xfs/stat.

(r io.Reader)

// ParseStats parses a Stats from an input io.Reader, using the format
// found in /proc/fs/xfs/stat.
func ParseStats(r io.Reader) (*Stats, error) {
	const (
		// Fields parsed into stats structures.
		fieldExtentAlloc = "extent_alloc"
		fieldAbt         = "abt"
		fieldBlkMap      = "blk_map"
		fieldBmbt        = "bmbt"
		fieldDir         = "dir"
		fieldTrans       = "trans"
		fieldIg          = "ig"
		fieldLog         = "log"
		fieldPushAil     = "push_ail"
		fieldXstrat      = "xstrat"
		fieldRw          = "rw"
		fieldAttr        = "attr"
		fieldIcluster    = "icluster"
		fieldVnodes      = "vnodes"
		fieldBuf         = "buf"
		fieldXpc         = "xpc"
		fieldAbtb2       = "abtb2"
		fieldAbtc2       = "abtc2"
		fieldBmbt2       = "bmbt2"
		fieldIbt2        = "ibt2"
		fieldFibt2       = "fibt2"
		fieldRmapbt      = "rmapbt"
		fieldRefcntbt    = "refcntbt"
		fieldRmapbtMem   = "rmapbt_mem"
		fieldRcbagbt     = "rcbagbt"
		fieldRtrmapbt    = "rtrmapbt"
		fieldRtrmapbtMem = "rtrmapbt_mem"
		fieldRtrefcntbt  = "rtrefcntbt"
		fieldQm          = "qm"
		fieldDebug       = "debug"
		fieldZoned       = "zoned"
		fieldMetaFile    = "metafile"
		fieldDeferRelog  = "defer_relog"
	)

	var xfss Stats

	s := bufio.NewScanner(r)
	for s.Scan() {
		// Expect at least a string label and a single integer value, ex:
		//   - abt 0
		//   - rw 1 2
		//   - gc xpc 123  (two-word label)
		ss := strings.Fields(string(s.Bytes()))
		if len(ss) < 2 {
			continue
		}
		label := ss[0]

		// Special case: "gc xpc" is a two-word label in the kernel output.
		if label == "gc" && len(ss) >= 3 && ss[1] == "xpc" {
			us, err := util.ParseUint64s(ss[2:])
			if err != nil {
				return nil, err
			}