Anthony Liguori wrote:
David Barrett wrote:
I'm tracking down a image corruption issue and I'm curious if you can
answer the following:
1) Is there any difference between sending a "TERM" signal to the
QEMU process and typing "quit" at the monitor?
Yes. Since QEMU is single threaded, when you issue a quit, you know
you aren't in the middle of writing qcow2 meta data to disk.
That's not enough. If you write a metadata pointer before allocating
and writing the block, and you terminate between these two operations,
the next write allocation will leave two pointers pointing to the same
block.
I don't know if qemu is susceptible to this.
--
Do not meddle in the internals of kernels, for they are subtle and quick to
panic.
