87 lines
1.4 KiB
Go
87 lines
1.4 KiB
Go
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package btrfs
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/*
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#include <stddef.h>
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#include <btrfs/ioctl.h>
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#include <btrfs/ctree.h>
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*/
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import "C"
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import (
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"bufio"
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"bytes"
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"fmt"
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"os"
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"strings"
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"unsafe"
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"github.com/pkg/errors"
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)
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func subvolID(fd uintptr) (uint64, error) {
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var args C.struct_btrfs_ioctl_ino_lookup_args
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args.objectid = C.BTRFS_FIRST_FREE_OBJECTID
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if err := ioctl(fd, C.BTRFS_IOC_INO_LOOKUP, uintptr(unsafe.Pointer(&args))); err != nil {
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return 0, err
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}
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return uint64(args.treeid), nil
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}
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var (
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zeroArray = [16]byte{}
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zeros = zeroArray[:]
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)
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func uuidString(uuid *[C.BTRFS_UUID_SIZE]C.u8) string {
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b := (*[1<<31 - 1]byte)(unsafe.Pointer(uuid))[:C.BTRFS_UUID_SIZE]
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if bytes.Equal(b, zeros) {
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return ""
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}
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return fmt.Sprintf("%x-%x-%x-%x-%x", b[:4], b[4:4+2], b[6:6+2], b[8:8+2], b[10:16])
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}
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func findMountPoint(path string) (string, error) {
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fp, err := os.Open("/proc/self/mounts")
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if err != nil {
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return "", err
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}
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defer fp.Close()
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const (
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deviceIdx = 0
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pathIdx = 1
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typeIdx = 2
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options = 3
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)
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var (
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mount string
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scanner = bufio.NewScanner(fp)
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)
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for scanner.Scan() {
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fields := strings.Fields(scanner.Text())
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if fields[typeIdx] != "btrfs" {
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continue // skip non-btrfs
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}
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if strings.HasPrefix(path, fields[pathIdx]) {
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mount = fields[pathIdx]
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}
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}
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if scanner.Err() != nil {
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return "", scanner.Err()
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}
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if mount == "" {
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return "", errors.Errorf("mount point of %v not found", path)
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}
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return mount, nil
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}
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