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chore: Retry reread partition table if EBUSY

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Should help make it more robust

Signed-off-by: Brad Beam <brad.beam@talos-systems.com>
This commit is contained in:
Brad Beam 2019-08-16 23:09:00 -05:00 committed by Andrew Rynhard
parent 0dc5551510
commit a68cac0a94
1 changed files with 16 additions and 3 deletions
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19
pkg/blockdevice/blockdevice.go
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@ -8,6 +8,8 @@ package blockdevice
import (
"bytes"
"os"
"syscall"
"time"
"unsafe"
"github.com/pkg/errors"
@ -106,12 +108,23 @@ func (bd *BlockDevice) RereadPartitionTable() error {
if _, _, ret := unix.Syscall(unix.SYS_IOCTL, bd.f.Fd(), unix.BLKFLSBUF, 0); ret != 0 {
return errors.Errorf("flush block device buffers: %v", ret)
}
// Reread the partition table.
if _, _, ret := unix.Syscall(unix.SYS_IOCTL, bd.f.Fd(), unix.BLKRRPART, 0); ret != 0 {
return errors.Errorf("re-read partition table: %v", ret)
var err error
for i := 0; i < 50; i++ {
if _, _, ret := unix.Syscall(unix.SYS_IOCTL, bd.f.Fd(), unix.BLKRRPART, 0); ret != 0 {
err = errors.Errorf("re-read partition table: %v", ret)
switch ret {
case syscall.EBUSY:
time.Sleep(100 * time.Millisecond)
continue
default:
return err
}
}
}
return nil
return err
}
// Device returns the backing file for the block device