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Re: [libvirt] [PATCH] qemu: add port check for iscsi host when disk type is network



On 11/13/14 11:17, Shanzhi Yu wrote:
> 
> On 11/13/2014 05:42 PM, Peter Krempa wrote:
>> On 11/13/14 10:28, Shanzhi Yu wrote:
>>> For network type disk, host port is not checked when source protocol is
>>> iscsi, so the error is not sure when with invalid port. If pass -1 to
>>> port
>>> the error  will be
>>> error: Failed to start domain rh6-i
>>> error: An error occurred, but the cause is unknown
>>>
>>> Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1163553
>>> Signed-off-by: Shanzhi Yu <shyu redhat com>
>>> ---
>>>   src/qemu/qemu_command.c | 6 ++++++
>>>   1 file changed, 6 insertions(+)
>>>
>>> diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
>>> index f674ba9..f806225 100644
>>> --- a/src/qemu/qemu_command.c
>>> +++ b/src/qemu/qemu_command.c
>>> @@ -3016,6 +3016,12 @@ qemuBuildNetworkDriveURI(int protocol,
>>>           case VIR_STORAGE_NET_PROTOCOL_FTPS:
>>>           case VIR_STORAGE_NET_PROTOCOL_TFTP:
>>>           case VIR_STORAGE_NET_PROTOCOL_ISCSI:
>>> +            if (STRNEQ_NULLABLE(hosts->port,"3260")) {
>>> +                virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
>>> +                               _("expected port for iscsi host
>>> should be 3260"));
>>> +                goto cleanup;
>>> +            }
>> Um? this would forbid to use any other port than 3260 for any of the
>> protocols stated above. That doesn't make sense neither for iSCSI nor
>> for the other ones.
>>
>> The code should make sure that the port is in range <0,65536> and don't
>> force to use a certain port. Ohterwise we wouldn't need a port field.
> 
> How about make a check for every protocols above, eg FTP, HTTP. As
> known, different protocol use certain port, if just make sure

They use certain ports as a default. That doesn't mean the admin can't
configure to run the service at a different port.

> the port is in range <0.65535>,  error info may be like
> 
> error: Failed to start domain rh6-i
> error: internal error: process exited while connecting to monitor:
> 2014-11-13T10:06:57.112170Z qemu-system-x86_64: -drive
> file=ftp://10.66.6.111:100/mnt/nfs/rhel6.img,if=none,id=drive-virtio-disk0,format=raw,cache=none:
> could not open disk image ftp://10.66.6.111:100/mnt/nfs/rhel6.img: curl
> block device does not support writes

You didn't understand the error message apparently. The message says
that the FTP backend in qemu is supported only with read-only disks, not
that port "100" is invalid.


> 
>>

Peter


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