{
  "slug": "btrfs-read-only-subvolume",
  "term": "Btrfs read-only subvolume",
  "aliases": [
    "Btrfs subvolume ro property"
  ],
  "definition": "A Btrfs read-only subvolume is a subvolume whose ro property prevents modification of its file contents and directory hierarchy.",
  "note": "The property belongs to the subvolume, not its access path: a read-only mount does not set it. A parent snapshot does not include nested subvolume contents; those locations become stubs. [property] [subvolume]",
  "limitations": [
    {
      "text": "This is not device-wide write protection or an independent backup.",
      "citationIds": [
        "subvolume"
      ]
    }
  ],
  "related": [
    "btrfs",
    "snapshot",
    "read-only-mount",
    "block-device-read-only"
  ],
  "citations": [
    {
      "id": "property",
      "title": "Btrfs documentation: subvolume ro property",
      "url": "https://btrfs.readthedocs.io/en/stable/btrfs-property.html",
      "accessed": "2026-10-15"
    },
    {
      "id": "subvolume",
      "title": "Btrfs documentation: subvolume flags and non-recursive snapshots",
      "url": "https://btrfs.readthedocs.io/en/stable/btrfs-subvolume.html",
      "accessed": "2026-10-15"
    },
    {
      "id": "hesela",
      "title": "Hesela: Btrfs tree logs and read-only scope boundaries",
      "url": "https://hesela.com/analyses/btrfs-tree-log-read-only-replay/#read-only-scopes",
      "accessed": "2026-10-15"
    }
  ],
  "status": "shipping",
  "advantages": [],
  "supersedes": [],
  "supersededBy": [],
  "firstSeen": null,
  "lastSeen": null,
  "updated": "2026-10-15"
}