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| H A D | copy-before-write.c | diff 137b4d4bd506bd42c18718f3f8b43a2d7c3346a8 Wed Mar 13 10:28:18 CDT 2024 Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru> block/copy-before-write: fix permission
In case when source node does not have any parents, the condition still
works as required: backup job do create the parent by
block_job_create -> block_job_add_bdrv -> bdrv_root_attach_child
Still, in this case checking @perm variable doesn't work, as backup job
creates the root blk with empty permissions (as it rely on CBW filter
to require correct permissions and don't want to create extra
conflicts).
So, we should not check @perm.
The hack may be dropped entirely when transactional insertion of
filter (when we don't try to recalculate permissions in intermediate
state, when filter does conflict with original parent of the source
node) merged (old big series
"[PATCH v5 00/45] Transactional block-graph modifying API"[1] and it's
current in-flight part is "[PATCH v8 0/7] blockdev-replace"[2])
[1] https://patchew.org/QEMU/20220330212902.590099-1-vsementsov@openvz.org/
[2] https://patchew.org/QEMU/20231017184444.932733-1-vsementsov@yandex-team.ru/
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Tested-by: Fiona Ebner <f.ebner@proxmox.com>
Message-Id: <20240313152822.626493-2-vsementsov@yandex-team.ru>
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
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