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return nil instead of memory access error

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This commit is contained in:
Chris Lu 2013-03-20 01:23:15 -07:00
parent 6658d5de45
commit 1aea3512a4
1 changed files with 4 additions and 1 deletions
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5
go/topology/volume_layout.go
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@ -43,7 +43,10 @@ func (vl *VolumeLayout) isWritable(v *storage.VolumeInfo) bool {
}
func (vl *VolumeLayout) Lookup(vid storage.VolumeId) []*DataNode {
return vl.vid2location[vid].list
if location := vl.vid2location[vid]; location != nil {
return location.list
}
return nil
}
func (vl *VolumeLayout) PickForWrite(count int) (*storage.VolumeId, int, *VolumeLocationList, error) {