8:40 a.m.
So, domain renaming works like this: new domain name is added
into the list of domain objects. Then, domain definition is
updated. After that, old domain name is removed from the domain
object list. Now, if the very firs step fails for some reason, no
error is reported:
virsh # domrename dummy dummy
error: An error occurred, but the cause is unknown
Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com>
---
src/qemu/qemu_driver.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 3683591..8e365bd 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -19950,8 +19950,11 @@ static int qemuDomainRename(virDomainPtr dom,
goto endjob;
}
- if (virDomainObjListRenameAddNew(driver->domains, vm, new_name) < 0)
+ if (virDomainObjListRenameAddNew(driver->domains, vm, new_name) < 0) {
+ virReportError(VIR_ERR_OPERATION_FAILED, "%s",
+ _("could not add new name into internal list of
domains"));
goto endjob;
+ }
if ((logfile = qemuDomainCreateLog(driver, vm, true)) < 0)
goto rollback;
--
2.4.6
9:26 a.m.
On Fri, Aug 14, 2015 at 03:40:16PM +0200, Michal Privoznik wrote:
So, domain renaming works like this: new domain name is added
into the list of domain objects. Then, domain definition is
updated. After that, old domain name is removed from the domain
object list. Now, if the very firs step fails for some reason, no
Well, the problem here is that the first step can fail for 2 reasons.
One of them is that the domain already exists, the second one is an
OOM error. What's even worse is that the OOM error gets reported, but
the duplicate key error doesn't.
There should be either a hint for the user that domain with such name
already exists or that should be checked right before. The second
variant would not be race-free, but there would be only a small window
of opportunity left. The con would be that you won't report "already
exists" error when there's an OOM error already. Checking for that
error seems too weird, it would be more worth fixing the has table
implementation we have :)
error is reported:
virsh # domrename dummy dummy
error: An error occurred, but the cause is unknown
Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com>
---
src/qemu/qemu_driver.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 3683591..8e365bd 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -19950,8 +19950,11 @@ static int qemuDomainRename(virDomainPtr dom,
goto endjob;
}
- if (virDomainObjListRenameAddNew(driver->domains, vm, new_name) < 0)
+ if (virDomainObjListRenameAddNew(driver->domains, vm, new_name) < 0) {
+ virReportError(VIR_ERR_OPERATION_FAILED, "%s",
+ _("could not add new name into internal list of
domains"));
goto endjob;
+ }
if ((logfile = qemuDomainCreateLog(driver, vm, true)) < 0)
goto rollback;
--
2.4.6
--
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1:39 p.m.
On 15.08.2015 16:26, Martin Kletzander wrote:
On Fri, Aug 14, 2015 at 03:40:16PM +0200, Michal Privoznik wrote:
> So, domain renaming works like this: new domain name is added
> into the list of domain objects. Then, domain definition is
> updated. After that, old domain name is removed from the domain
> object list. Now, if the very firs step fails for some reason, no
Well, the problem here is that the first step can fail for 2 reasons.
One of them is that the domain already exists, the second one is an
OOM error. What's even worse is that the OOM error gets reported, but
the duplicate key error doesn't.
There should be either a hint for the user that domain with such name
already exists or that should be checked right before. The second
variant would not be race-free, but there would be only a small window
of opportunity left. The con would be that you won't report "already
exists" error when there's an OOM error already. Checking for that
error seems too weird, it would be more worth fixing the has table
implementation we have :)
Hm.. I agree that the partial error reporting is bad and definitely
calls for fixing. But I think it's gonna be tricky. I mean, we can't
emit a generic enough error message. "Duplicate key $key" would not be
much helpful for users since hash tables are used not only in
virDomainObjList. But maybe it would be better than nothing.
As a separate patch, we can reject the same name. Okay.
Michal
3:38 p.m.
On Mon, Aug 17, 2015 at 08:39:29PM +0200, Michal Privoznik wrote:
On 15.08.2015 16:26, Martin Kletzander wrote:
> On Fri, Aug 14, 2015 at 03:40:16PM +0200, Michal Privoznik wrote:
>> So, domain renaming works like this: new domain name is added
>> into the list of domain objects. Then, domain definition is
>> updated. After that, old domain name is removed from the domain
>> object list. Now, if the very firs step fails for some reason, no
>
> Well, the problem here is that the first step can fail for 2 reasons.
> One of them is that the domain already exists, the second one is an
> OOM error. What's even worse is that the OOM error gets reported, but
> the duplicate key error doesn't.
>
> There should be either a hint for the user that domain with such name
> already exists or that should be checked right before. The second
> variant would not be race-free, but there would be only a small window
> of opportunity left. The con would be that you won't report "already
> exists" error when there's an OOM error already. Checking for that
> error seems too weird, it would be more worth fixing the has table
> implementation we have :)
Hm.. I agree that the partial error reporting is bad and definitely
calls for fixing. But I think it's gonna be tricky. I mean, we can't
emit a generic enough error message. "Duplicate key $key" would not be
much helpful for users since hash tables are used not only in
virDomainObjList. But maybe it would be better than nothing.
As a separate patch, we can reject the same name. Okay.
Yeah, it's enough for me to add a check for same name and that it
doesn't already exists.
Michal
4:27 p.m.
On Fri, Aug 14, 2015 at 03:40:16PM +0200, Michal Privoznik wrote:
So, domain renaming works like this: new domain name is added
into the list of domain objects. Then, domain definition is
updated. After that, old domain name is removed from the domain
object list. Now, if the very firs step fails for some reason, no
error is reported:
virsh # domrename dummy dummy
error: An error occurred, but the cause is unknown
ACK series.
Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com>
---
src/qemu/qemu_driver.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 3683591..8e365bd 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -19950,8 +19950,11 @@ static int qemuDomainRename(virDomainPtr dom,
goto endjob;
}
- if (virDomainObjListRenameAddNew(driver->domains, vm, new_name) < 0)
+ if (virDomainObjListRenameAddNew(driver->domains, vm, new_name) < 0) {
+ virReportError(VIR_ERR_OPERATION_FAILED, "%s",
+ _("could not add new name into internal list of
domains"));
goto endjob;
+ }
if ((logfile = qemuDomainCreateLog(driver, vm, true)) < 0)
goto rollback;
--
2.4.6
--
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4:45 p.m.
On 17.08.2015 23:27, Martin Kletzander wrote:
On Fri, Aug 14, 2015 at 03:40:16PM +0200, Michal Privoznik wrote:
> So, domain renaming works like this: new domain name is added
> into the list of domain objects. Then, domain definition is
> updated. After that, old domain name is removed from the domain
> object list. Now, if the very firs step fails for some reason, no
> error is reported:
>
> virsh # domrename dummy dummy
> error: An error occurred, but the cause is unknown
>
ACK series.
I believe this was meant to the v2. So I've pushed that one. Thanks!
Michal
6:10 p.m.
On Mon, Aug 17, 2015 at 11:45:09PM +0200, Michal Privoznik wrote:
On 17.08.2015 23:27, Martin Kletzander wrote:
> On Fri, Aug 14, 2015 at 03:40:16PM +0200, Michal Privoznik wrote:
>> So, domain renaming works like this: new domain name is added
>> into the list of domain objects. Then, domain definition is
>> updated. After that, old domain name is removed from the domain
>> object list. Now, if the very firs step fails for some reason, no
>> error is reported:
>>
>> virsh # domrename dummy dummy
>> error: An error occurred, but the cause is unknown
>>
>
> ACK series.
I believe this was meant to the v2. So I've pushed that one. Thanks!
Yes, you got it ;)
6:09 p.m.
On Mon, Aug 17, 2015 at 02:27:57PM -0700, Martin Kletzander wrote:
On Fri, Aug 14, 2015 at 03:40:16PM +0200, Michal Privoznik wrote:
>So, domain renaming works like this: new domain name is added
>into the list of domain objects. Then, domain definition is
>updated. After that, old domain name is removed from the domain
>object list. Now, if the very firs step fails for some reason, no
>error is reported:
>
>virsh # domrename dummy dummy
>error: An error occurred, but the cause is unknown
>
ACK series.
Sorry for that, disregard this mail, I was missing cover letter in one
of your series that was right below this mail.
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