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Given that the whole thing supported copy on write from the beginning, transactions end up being fairly simple. On starting a transaction, just take a ref of the existing root; swap it back in on a successful commit. The main tree has a transaction ID too, and we keep a record of the last transaction ID given out. if the main tree is ever modified when it isn't the latest, it gets a new transaction ID. A commit can only succeed if the main tree hasn't moved on since it was forked. Strictly speaking, the XenStore protocol allows a transaction to succeed as long as nothing *it* read or wrote has changed in the interim, but no implementations do that; *any* change is sufficient to abort a transaction. This does not yet fire watches on the changed nodes on a commit. That bit is more fun and will come in a follow-on commit. Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Reviewed-by: Paul Durrant <paul@xen.org> |
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| .. | ||
| avocado | ||
| bench | ||
| data | ||
| decode | ||
| docker | ||
| fp | ||
| guest-debug | ||
| image-fuzzer | ||
| include | ||
| keys | ||
| lcitool | ||
| migration | ||
| multiboot | ||
| perf/block/qcow2 | ||
| plugin | ||
| qapi-schema | ||
| qemu-iotests | ||
| qtest | ||
| rocker | ||
| tcg | ||
| tsan | ||
| uefi-test-tools | ||
| unit | ||
| vm | ||
| vmstate-static-checker-data | ||
| check-block.sh | ||
| dbus-vmstate-daemon.sh | ||
| Makefile.include | ||
| meson.build | ||
| requirements.txt | ||
| test-qht-par.c | ||
| vhost-user-bridge.c | ||