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refs/changes/09/747609/1"}}},"commit":{"parents":[{"commit":"30ee639b6292b006bbbfe9843b17739c0b8441e7","subject":"[Trivial] Remove wrong format_message() conversion","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/30ee639b6292b006bbbfe9843b17739c0b8441e7"}]}],"author":{"name":"Arthur Dayne","email":"huyueheng@inspur.com","date":"2019-09-17 11:08:59.000000000","tz":480},"committer":{"name":"norman shen","email":"yshxxsjt715@gmail.com","date":"2020-08-24 04:08:12.000000000","tz":0},"subject":"libvirt:driver:Disallow AIO\u003dnative when \u0027O_DIRECT\u0027 is not available","message":"libvirt:driver:Disallow AIO\u003dnative when \u0027O_DIRECT\u0027 is not available\n\nBecause of the libvirt issue[1], there is a bug[2] that if we set cache mode\nwhose write semantic is not O_DIRECT (.i.e unsafe, writeback or writethrough),\nthere will be a problem with the volume drivers\n(.i.e nova.virt.libvirt.volume.LibvirtISCSIVolumeDriver,\nnova.virt.libvirt.volume.LibvirtNFSVolumeDriver and so on), which designate\nnative io explicitly.\n\nThat problem will generate a libvirt xml for the instance,\nwhose content contains\n\n```\n...\n\u003cdisk ... \u003e\n  \u003cdriver ... cache\u003d\u0027unsafe/writeback/writethrough\u0027 io\u003d\u0027native\u0027 /\u003e\n\u003c/disk\u003e\n...\n```\nIn turn, it will fail to start the instance or attach the disk.\n\n\u003e When qemu is configured with a block device that has aio\u003dnative set, but\n\u003e the cache mode doesn\u0027t use O_DIRECT (i.e. isn\u0027t cache\u003dnone/directsync or any\n\u003e unnamed mode with explicit cache.direct\u003don), then the raw-posix block driver\n\u003e for local files and block devices will silently fall back to aio\u003dthreads.\n\u003e The blockdev-add interface rejects such combinations, but qemu can\u0027t\n\u003e change the existing legacy interfaces that libvirt uses today.\n\n[1]: https://github.com/libvirt/libvirt/commit/058384003db776c580d0e5a3016a6384e8eb7b92\n[2]: https://bugzilla.redhat.com/show_bug.cgi?id\u003d1086704\n\nCloses-Bug: #1841363\nChange-Id: If9acc054100a6733f3659a15dd9fc2d462e84d64\n(cherry picked from commit af2405e1181d70cdf60bcd0e40b3e80f2db2e3a6)\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/0bd58921a1fcaffcc4fac25f63434c9cab93b061"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/0bd58921a1fcaffcc4fac25f63434c9cab93b061"}]},"branch":"refs/heads/stable/ussuri"}},"requirements":[],"submit_records":[],"submit_requirements":[]}