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block: add support for job pause/resume

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Job pausing reuses the existing support for cancellable sleeps.  A pause
happens at the next sleeping point and lasts until the coroutine is
re-entered explicitly.  Cancellation was already doing a forced resume,
so implement it explicitly in terms of resume.

Paused jobs cannot be canceled without first resuming them.  This ensures
that I/O errors are never missed by management.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2012-09-28 17:22:50 +02:00 • committed by Kevin Wolf
parent 8d65883fff
commit 8acc72a4d2
5 changed files with 73 additions and 7 deletions
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4
blockdev.c
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@ -1221,6 +1221,10 @@ void qmp_block_job_cancel(const char *device, Error **errp)
error_set(errp, QERR_BLOCK_JOB_NOT_ACTIVE, device);
return;
}
if (job->paused) {
error_set(errp, QERR_BLOCK_JOB_PAUSED, device);
return;
}
trace_qmp_block_job_cancel(job);
block_job_cancel(job);