[libvirt] [PATCH] blockjob: Fix a error checking of blockjob status in some case
offset and len can also be equal to 0 on failed if blockjob return status:"BLOCK_JOB_COMPLETED" with error:"File descriptor in bad state", this bug can be reproduced easily if you perform a async block job on read only filesystem, so it's very worthwhile for us to check 'error' in this case. --- src/qemu/qemu_monitor_json.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c index 5ddd855..442b218 100644 --- a/src/qemu/qemu_monitor_json.c +++ b/src/qemu/qemu_monitor_json.c @@ -889,7 +889,7 @@ qemuMonitorJSONHandleBlockJobImpl(qemuMonitorPtr mon, case VIR_DOMAIN_BLOCK_JOB_COMPLETED: error = virJSONValueObjectGetString(data, "error"); /* Make sure the whole device has been processed */ - if (offset != len) + if (offset != len || error) event = VIR_DOMAIN_BLOCK_JOB_FAILED; break; case VIR_DOMAIN_BLOCK_JOB_CANCELED: -- 1.8.3.1
On 01/19/2018 09:03 AM, Jie Wang wrote:
offset and len can also be equal to 0 on failed if blockjob return status:"BLOCK_JOB_COMPLETED" with error:"File descriptor in bad state", this bug can be reproduced easily if you perform a async block job on read only filesystem, so it's very worthwhile for us to check 'error' in this case.
Perhaps better said: Commit id 'bc444666f' added a check if the returned data buffer had an error, but failed to adjust the event from VIR_DOMAIN_BLOCK_JOB_COMPLETED to VIR_DOMAIN_BLOCK_JOB_FAILED in order to propagate an error such as "File descriptor in bad state" that may be returned from QEMU when both @offset and @len are set to 0 such as is the case when performing an async block job read on a read only filesystem. If that adjustment is fine with you and anyone else that cares to read this response, then I'll make the adjustment and push... Reviewed-by: John Ferlan <jferlan@redhat.com> John
--- src/qemu/qemu_monitor_json.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c index 5ddd855..442b218 100644 --- a/src/qemu/qemu_monitor_json.c +++ b/src/qemu/qemu_monitor_json.c @@ -889,7 +889,7 @@ qemuMonitorJSONHandleBlockJobImpl(qemuMonitorPtr mon, case VIR_DOMAIN_BLOCK_JOB_COMPLETED: error = virJSONValueObjectGetString(data, "error"); /* Make sure the whole device has been processed */ - if (offset != len) + if (offset != len || error) event = VIR_DOMAIN_BLOCK_JOB_FAILED; break; case VIR_DOMAIN_BLOCK_JOB_CANCELED:
On 01/31/2018 08:56 AM, John Ferlan wrote:
On 01/19/2018 09:03 AM, Jie Wang wrote:
offset and len can also be equal to 0 on failed if blockjob return status:"BLOCK_JOB_COMPLETED" with error:"File descriptor in bad state", this bug can be reproduced easily if you perform a async block job on read only filesystem, so it's very worthwhile for us to check 'error' in this case.
Perhaps better said:
Commit id 'bc444666f' added a check if the returned data buffer had an error, but failed to adjust the event from VIR_DOMAIN_BLOCK_JOB_COMPLETED to VIR_DOMAIN_BLOCK_JOB_FAILED in order to propagate an error such as "File descriptor in bad state" that may be returned from QEMU when both @offset and @len are set to 0 such as is the case when performing an async block job read on a read only filesystem.
If that adjustment is fine with you and anyone else that cares to read this response, then I'll make the adjustment and push...
Reviewed-by: John Ferlan <jferlan@redhat.com>
Works for me as well. -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3266 Virtualization: qemu.org | libvirt.org
participants (3)
-
Eric Blake -
Jie Wang -
John Ferlan