<!--
{
  "availability" : [
    "macOS: 15.4.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "FSKit",
  "identifier" : "/documentation/FSKit/FSVolume/SetXattrPolicy/mustCreate",
  "metadataVersion" : "0.1.0",
  "role" : "Case",
  "symbol" : {
    "kind" : "Case",
    "modules" : [
      "FSKit"
    ],
    "preciseIdentifier" : "c:@E@FSSetXattrPolicy@FSSetXattrPolicyMustCreate"
  },
  "title" : "FSVolume.SetXattrPolicy.mustCreate"
}
-->

# FSVolume.SetXattrPolicy.mustCreate

Set the value, but fail if the extended attribute already exists.

```
case mustCreate
```

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)