Disk space leak on first rollback of btrfs filesystem

This document (7016367) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Linux Enterprise Server 12

Situation

After the first rollback, disk space does not get freed up automatically as the original root filesystem is not accessible below /.snapshots but still occupies space.

Resolution

The disk space can be freed by following these steps:
  • Mount the initial root filesystem after a rollback with
    mount /dev/<root> -o subvol=@ /mnt
  • Remove all files below /mnt that are not in a subvolume with
    find /mnt -xdev -delete
  • Umount the filesystem again with
    umount /mnt

Cause


Additional Information

The issue only occurs after the first rollback, later rollbacks will free up space automatically.

Disclaimer

This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

  • Document ID:7016367
  • Creation Date: 31-Mar-2015
  • Modified Date:03-Mar-2020
    • SUSE Linux Enterprise Server

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