Revert VM migration shutdown order change + change post_detach to post_deactivate #6260
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This reverts commit 889dfa6. As there is no need to clean up the source VM earlier at all, VM_save already does the job of deactivating the source VM datapath. Signed-off-by: Vincent Liu <shuntian.liu2@cloud.com>
Previously the `post_detach_hook` was run after the VDI is detached on the source VM, which is at the very end of the SXM, where the source VM is shutdown. However, the job of `post_detach_hook` is to call `Remote.receive_finalize` which will destroy the mirroring datapath. This should have been called as soon as we deactivate the datapath on the source VM, at which point the source VM will stop writing using that datapath. This commit changes `post_detach_hook` to `post_deactivate_hook` and moves its calling locations accordingly. Signed-off-by: Vincent Liu <shuntian.liu2@cloud.com>
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robhoes
approved these changes
Jan 29, 2025
| | Vdi_automaton.Deactivate -> | ||
| Storage_migrate.pre_deactivate_hook ~dbg ~dp ~sr ~vdi ; | ||
| Impl.VDI.deactivate context ~dbg ~dp ~sr ~vdi ~vm ; | ||
| Storage_migrate.post_deactivate_hook ~sr ~vdi ~dp ; |
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This is SMAPIv1 only. I guess it still works for the v1 to v3 storage migration but anything migrating from SMAPIv3 would need another plan.
psafont
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Jan 29, 2025
lindig
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Jan 29, 2025
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There are two parts to this PR:
VM_savewould actually deactivate the source VM datapath. Thanks @edwintorok for pointing that out.post_detach_hooktopost_deactivate_hook, as this should have been called as soon as the datapath is deactivated, at which point all r/w using that datapath will be stopped.More details in the commit message.