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information.\nThe action was registered but not documented for API consumers: api-ref\nhad no entry for it, and there was no user-facing guide explaining how to\nturn the returned extent map into an actual incremental copy.\n\nAdd that documentation:\n\n* api-ref: a \"List changed blocks between snapshots\" action under volume\n  actions, with request/response parameter definitions, request and\n  response samples, the pagination/windowing parameters (offset, length,\n  marker, limit / changed_blocks_next_marker), the 409 behaviour when a\n  backend does not support CBT, and -- importantly for correctness -- the\n  exists semantics (exists\u003dtrue means allocated and must be copied,\n  including a write of zeroes; exists\u003dfalse means sparse and skippable).\n\n* admin guide: \"Querying changed blocks (CBT) via the API\", covering the\n  allocation-map (full) query, pagination, capability discovery via 409,\n  and the fact that the action returns only the map of changed blocks --\n  reading the changed bytes is a separate step using the normal Cinder\n  data path (create volume from snapshot, attach, read the reported\n  offsets), which is the sequence cinder-backup performs internally.\n\nThis is documentation only; there is no behaviour change. It depends on\nthe framework change that adds the action itself (and the CBT contributor\nguide the admin guide cross-references).\n\nDepends-On: https://review.opendev.org/c/openstack/cinder/+/990923\nChange-Id: I59191bc0891995e3c97a518fcac91c2d745093a6\nSigned-off-by: Simon Dodsley \u003csimon@purestorage.com\u003e\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/cinder/commit/14f0de18c9653d15530aed90440004c592bd97e3"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/cinder/commit/14f0de18c9653d15530aed90440004c592bd97e3"}]},"branch":"refs/heads/master"},"791cc45d733970e2ed3f089d3a91969548a375dd":{"kind":"REWORK","_number":2,"created":"2026-07-03 18:07:36.000000000","uploader":{"_account_id":13425,"name":"Simon Dodsley","email":"simon@purestorage.com","username":"sdodsley"},"ref":"refs/changes/64/995964/2","fetch":{"anonymous http":{"url":"https://review.opendev.org/openstack/cinder","ref":"refs/changes/64/995964/2","commands":{"Checkout":"git fetch https://review.opendev.org/openstack/cinder refs/changes/64/995964/2 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.opendev.org/openstack/cinder refs/changes/64/995964/2 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.opendev.org/openstack/cinder refs/changes/64/995964/2 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.opendev.org/openstack/cinder refs/changes/64/995964/2"}}},"commit":{"parents":[{"commit":"850a4ad429d7531ab0d0f5099dd60c34a20a8793","subject":"Use urllib3 directly instead of requests.packages.urllib3","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/cinder/commit/850a4ad429d7531ab0d0f5099dd60c34a20a8793"}]}],"author":{"name":"Simon Dodsley","email":"simon@purestorage.com","date":"2026-07-03 14:44:49.000000000","tz":-240},"committer":{"name":"Simon Dodsley","email":"simon@purestorage.com","date":"2026-07-03 15:34:36.000000000","tz":-240},"subject":"Document os-list_changed_blocks in api-ref and admin guide","message":"Document os-list_changed_blocks in api-ref and admin guide\n\nThe changed-blocks framework added the os-list_changed_blocks volume\naction (microversion 3.72) so that external backup tooling with API-only\naccess can query a backend\u0027s Changed Block Tracking (CBT) information.\nThe action was registered but not documented for API consumers: api-ref\nhad no entry for it, and there was no user-facing guide explaining how to\nturn the returned extent map into an actual incremental copy.\n\nAdd that documentation:\n\n* api-ref: a \"List changed blocks between snapshots\" action under volume\n  actions, with request/response parameter definitions, request and\n  response samples, the pagination/windowing parameters (offset, length,\n  marker, limit / changed_blocks_next_marker), the 409 behaviour when a\n  backend does not support CBT, and -- importantly for correctness -- the\n  exists semantics (exists\u003dtrue means allocated and must be copied,\n  including a write of zeroes; exists\u003dfalse means sparse and skippable).\n\n* admin guide: \"Querying changed blocks (CBT) via the API\", covering the\n  allocation-map (full) query, pagination, capability discovery via 409,\n  and the fact that the action returns only the map of changed blocks --\n  reading the changed bytes is a separate step using the normal Cinder\n  data path (create volume from snapshot, attach, read the reported\n  offsets), which is the sequence cinder-backup performs internally.\n\nThis is documentation only; there is no behaviour change. It depends on\nthe framework change that adds the action itself (and the CBT contributor\nguide the admin guide cross-references).\n\nDepends-On: https://review.opendev.org/c/openstack/cinder/+/990923\nChange-Id: I59191bc0891995e3c97a518fcac91c2d745093a6\nSigned-off-by: Simon Dodsley \u003csimon@purestorage.com\u003e\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/cinder/commit/791cc45d733970e2ed3f089d3a91969548a375dd"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/cinder/commit/791cc45d733970e2ed3f089d3a91969548a375dd"}]},"branch":"refs/heads/master"},"109fd7d0a5c565197b34e43e40db2fbbedeeb395":{"kind":"REWORK","_number":3,"created":"2026-07-03 18:37:15.000000000","uploader":{"_account_id":13425,"name":"Simon Dodsley","email":"simon@purestorage.com","username":"sdodsley"},"ref":"refs/changes/64/995964/3","fetch":{"anonymous http":{"url":"https://review.opendev.org/openstack/cinder","ref":"refs/changes/64/995964/3","commands":{"Checkout":"git fetch https://review.opendev.org/openstack/cinder refs/changes/64/995964/3 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.opendev.org/openstack/cinder refs/changes/64/995964/3 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.opendev.org/openstack/cinder refs/changes/64/995964/3 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.opendev.org/openstack/cinder refs/changes/64/995964/3"}}},"commit":{"parents":[{"commit":"850a4ad429d7531ab0d0f5099dd60c34a20a8793","subject":"Use urllib3 directly instead of requests.packages.urllib3","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/cinder/commit/850a4ad429d7531ab0d0f5099dd60c34a20a8793"}]}],"author":{"name":"Simon Dodsley","email":"simon@purestorage.com","date":"2026-07-03 14:44:49.000000000","tz":-240},"committer":{"name":"Simon Dodsley","email":"simon@purestorage.com","date":"2026-07-03 18:37:10.000000000","tz":-240},"subject":"Document os-list_changed_blocks in api-ref and admin guide","message":"Document os-list_changed_blocks in api-ref and admin guide\n\nThe changed-blocks framework added the os-list_changed_blocks volume\naction (microversion 3.72) so that external backup tooling with API-only\naccess can query a backend\u0027s Changed Block Tracking (CBT) information.\nThe action was registered but not documented for API consumers: api-ref\nhad no entry for it, and there was no user-facing guide explaining how to\nturn the returned extent map into an actual incremental copy.\n\nAdd that documentation:\n\n* api-ref: a \"List changed blocks between snapshots\" action under volume\n  actions, with request/response parameter definitions, request and\n  response samples, the pagination/windowing parameters (offset, length,\n  marker, limit / changed_blocks_next_marker), the 409 behaviour when a\n  backend does not support CBT, and -- importantly for correctness -- the\n  exists semantics (exists\u003dtrue means allocated and must be copied,\n  including a write of zeroes; exists\u003dfalse means sparse and skippable).\n\n* admin guide: \"Querying changed blocks (CBT) via the API\", covering the\n  allocation-map (full) query, pagination, capability discovery via 409,\n  and the fact that the action returns only the map of changed blocks --\n  reading the changed bytes is a separate step using the normal Cinder\n  data path (create volume from snapshot, attach, read the reported\n  offsets), which is the sequence cinder-backup performs internally.\n\nThis is documentation only; there is no behaviour change. It depends on\nthe framework change that adds the action itself (and the CBT contributor\nguide the admin guide cross-references).\n\nDepends-On: https://review.opendev.org/c/openstack/cinder/+/990923\nChange-Id: I59191bc0891995e3c97a518fcac91c2d745093a6\nSigned-off-by: Simon Dodsley \u003csimon@purestorage.com\u003e\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/cinder/commit/109fd7d0a5c565197b34e43e40db2fbbedeeb395"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/cinder/commit/109fd7d0a5c565197b34e43e40db2fbbedeeb395"}]},"branch":"refs/heads/master"},"44e9ab14b0af21ec078cb87be3105b47f7b31c5a":{"kind":"REWORK","_number":4,"created":"2026-07-03 21:14:31.000000000","uploader":{"_account_id":13425,"name":"Simon Dodsley","email":"simon@purestorage.com","username":"sdodsley"},"ref":"refs/changes/64/995964/4","fetch":{"anonymous http":{"url":"https://review.opendev.org/openstack/cinder","ref":"refs/changes/64/995964/4","commands":{"Checkout":"git fetch https://review.opendev.org/openstack/cinder refs/changes/64/995964/4 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://review.opendev.org/openstack/cinder refs/changes/64/995964/4 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://review.opendev.org/openstack/cinder refs/changes/64/995964/4 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://review.opendev.org/openstack/cinder refs/changes/64/995964/4"}}},"commit":{"parents":[{"commit":"850a4ad429d7531ab0d0f5099dd60c34a20a8793","subject":"Use urllib3 directly instead of requests.packages.urllib3","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/cinder/commit/850a4ad429d7531ab0d0f5099dd60c34a20a8793"}]}],"author":{"name":"Simon Dodsley","email":"simon@purestorage.com","date":"2026-07-03 14:44:49.000000000","tz":-240},"committer":{"name":"Simon Dodsley","email":"simon@purestorage.com","date":"2026-07-03 20:59:38.000000000","tz":-240},"subject":"Document os-list_changed_blocks in api-ref and admin guide","message":"Document os-list_changed_blocks in api-ref and admin guide\n\nThe changed-blocks framework added the os-list_changed_blocks volume\naction (microversion 3.72) so that external backup tooling with API-only\naccess can query a backend\u0027s Changed Block Tracking (CBT) information.\nThe action was registered but not documented for API consumers: api-ref\nhad no entry for it, and there was no user-facing guide explaining how to\nturn the returned extent map into an actual incremental copy.\n\nAdd that documentation:\n\n* api-ref: a \"List changed blocks between snapshots\" action under volume\n  actions, with request/response parameter definitions, request and\n  response samples, the pagination/windowing parameters (offset, length,\n  marker, limit / changed_blocks_next_marker), the 409 behaviour when a\n  backend does not support CBT, and -- importantly for correctness -- the\n  exists semantics (exists\u003dtrue means allocated and must be copied,\n  including a write of zeroes; exists\u003dfalse means sparse and skippable).\n\n* admin guide: \"Querying changed blocks (CBT) via the API\", covering the\n  allocation-map (full) query, pagination, capability discovery via 409,\n  and the fact that the action returns only the map of changed blocks --\n  reading the changed bytes is a separate step using the normal Cinder\n  data path (create volume from snapshot, attach, read the reported\n  offsets), which is the sequence cinder-backup performs internally.\n\nThis is documentation only; there is no behaviour change. 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