Fabiano Rosas <[email protected]> writes:
> Arun Menon <[email protected]> writes:
>
>> This is an incremental step in converting vmstate loading
>> code to report error via Error objects instead of directly
>> printing it to console/monitor.
>> It is ensured that vmstate_subsection_load() must report an error
>> in errp, in case of failure.
>>
>> Reviewed-by: Marc-André Lureau <[email protected]>
>> Signed-off-by: Arun Menon <[email protected]>
>> ---
>> migration/vmstate.c | 11 ++++++++---
>> 1 file changed, 8 insertions(+), 3 deletions(-)
>>
>> diff --git a/migration/vmstate.c b/migration/vmstate.c
>> index
>> 5feaa3244d259874f03048326b2497e7db32e47c..6108c7fe283a5013ce42ea9987723c489aef26a2
>> 100644
>> --- a/migration/vmstate.c
>> +++ b/migration/vmstate.c
>> @@ -25,7 +25,7 @@ static int vmstate_subsection_save(QEMUFile *f, const
>> VMStateDescription *vmsd,
>> void *opaque, JSONWriter *vmdesc,
>> Error **errp);
>> static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription
>> *vmsd,
>> - void *opaque);
>> + void *opaque, Error **errp);
>>
>> /* Whether this field should exist for either save or load the VM? */
>> static bool
>> @@ -225,7 +225,7 @@ int vmstate_load_state(QEMUFile *f, const
>> VMStateDescription *vmsd,
>> field++;
>> }
>> assert(field->flags == VMS_END);
>> - ret = vmstate_subsection_load(f, vmsd, opaque);
>> + ret = vmstate_subsection_load(f, vmsd, opaque, &error_fatal);
>> if (ret != 0) {
>> qemu_file_set_error(f, ret);
>> return ret;
>
> This is now unreachable, no?
>
Also, this temporary &error_fatal here and throughout the series will
break bisect badly, won't it? Imagine we have a bug in the code past
this point (once the future patch from this series removes the
&error_fatal), now every time this commit shows up in bisect, it will
abort earlier.
I get that having error_fatal here helps ensure the series is correct,
but maybe we should do without it.
Do others have an opinion here?
>> @@ -566,7 +566,7 @@ vmstate_get_subsection(const VMStateDescription * const
>> *sub,
>> }
>>
>> static int vmstate_subsection_load(QEMUFile *f, const VMStateDescription
>> *vmsd,
>> - void *opaque)
>> + void *opaque, Error **errp)
>> {
>> trace_vmstate_subsection_load(vmsd->name);
>>
>> @@ -598,6 +598,8 @@ static int vmstate_subsection_load(QEMUFile *f, const
>> VMStateDescription *vmsd,
>> sub_vmsd = vmstate_get_subsection(vmsd->subsections, idstr);
>> if (sub_vmsd == NULL) {
>> trace_vmstate_subsection_load_bad(vmsd->name, idstr,
>> "(lookup)");
>> + error_setg(errp, "VM subsection '%s' in '%s' does not exist",
>> + idstr, vmsd->name);
>> return -ENOENT;
>> }
>> qemu_file_skip(f, 1); /* subsection */
>> @@ -608,6 +610,9 @@ static int vmstate_subsection_load(QEMUFile *f, const
>> VMStateDescription *vmsd,
>> ret = vmstate_load_state(f, sub_vmsd, opaque, version_id);
>> if (ret) {
>> trace_vmstate_subsection_load_bad(vmsd->name, idstr, "(child)");
>> + error_setg(errp,
>> + "Loading VM subsection '%s' in '%s' failed: %d",
>> + idstr, vmsd->name, ret);
>> return ret;
>> }
>> }
