The AckRename callback of Windows cfapi blocks when move multiple files at the same time

Nayuta 6

hello,
I'm using the cfapi of Windows. Now I registered a rename callback by the flag of CF_CALLBACK_TYPE_NOTIFY_RENAME. The callback is normal when I only rename or move one file, but it will block when I move multi-files. It seems that it blocks when calling the CfExecute function. The rename callback like below:

static void rename_cb(CF_CALLBACK_INFO *info, CF_CALLBACK_PARAMETERS *params)
{
CF_OPERATION_INFO op_info = {0};
CF_OPERATION_PARAMETERS op_params = {0};
op_info.StructSize = sizeof(op_info);
op_info.Type = CF_OPERATION_TYPE_ACK_RENAME;
op_info.ConnectionKey = info->conn_key;
op_info.TransferKey = info->transfer_key;
op_info.RequestKey = info->request_key;

op_params.ParamSize = CF_SIZE_OF_OP_PARAM(AckRename);
op_params.AckRename.CompletionStatus = STATUS_SUCCESS;   

CfExecute (&op_info, &op_params)

}
Any advice is greatly appreciated. Thanks

Rita Han - MSFT 2,161 Reputation points

2020-11-10T06:40:21.227+00:00

Hello @Nayuta , I fail to reproduce this issue because it works for me when rename or move multiple files. The following snapshots show my steps to rename three files you can check if there is any difference with your steps.
Select all:

Rename all:

Result: all three files rename successfully and CfExecute doesn't block.
Nayuta 6 Reputation points

2020-11-10T07:15:54.077+00:00

Thanks for your replay,my steps are like this:
step1:I have 10+ placeholders in folder A , and I cut these files. (CTRL+A and CTRL +T)
step2:I paste these files in folder B.(CTRL + V)
The above behavior will trigger the rename callback.
The rename callback block occasionally and may need to try a few more times.
So maybe you need cut more files (10+) and paste them in another folder.
Thaks again for you reply.
Rita Han - MSFT 2,161 Reputation points

2020-11-10T07:50:00.937+00:00
I still can't reproduce this issue using 30 files and cut and paste more than five times. Since you mention "The rename callback block occasionally", so what's the frequency or probability for you to encounter this issue? And can you help to confirm the following information?

What are modifications you made to the official CloudMirror sample? So I can check if we use the same code.

What's your OS build version?
Nayuta 6 Reputation points

2020-11-10T08:08:04.933+00:00

Hello, Thanks for your reply.
The OS version of mine is win10 1809.
And the code should be the same.

It seems that the size of placehoders which you cut and paste is zero.
And the size of palcehoders which i cut and paste is not zero.Because I hydrate these files and free them, then I repeat these operations.
May this is the difference between us.

Best wishes.
Rita Han - MSFT 2,161 Reputation points

2020-11-16T02:19:39.793+00:00

Hello @Nayuta , I fail to reproduce this issue because it works for me when rename or move multiple files. The following snapshots show my steps to rename three files you can check if there is any difference with your steps.
Select all:

Rename all:

Result: all three files rename successfully and CfExecute doesn't block.

4 answers

Nayuta 6 Reputation points

2020-11-12T02:12:33.317+00:00

Sorry for late reply. Before that, I used a win10 virtual machine to use cfapi, but when I used a physical windows, this problem no longer appeared.So I think the problem should be caused by the virtual machine.
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Rita Han - MSFT 2,161 Reputation points

2020-11-12T07:01:43.98+00:00

I also did the same test on a VM and it works for me. So it seems specific environment related. Anyway, glad to hear it works for you on a physical machine. Thanks for update.
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Nayuta 6 Reputation points

2020-11-10T03:59:16.56+00:00

Can anyone give me some advices?
Thanks a lot!
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Nayuta 6 Reputation points

2020-11-10T07:41:27.137+00:00

The following snapshots show my steps to reproduce this problem.
select and cut all files in folder A:

paste these files in folder B:

Then exploer will block here because the rename callback block.

Thanks.
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Rita Han - MSFT 2,161 Reputation points

2020-11-10T08:24:31.05+00:00

Please double check the code since I have additional two custom state icons like below but you only have the first one: cloud icon.

Nayuta 6 Reputation points

2020-11-10T08:33:59.07+00:00

Thanks a lot.
I will check the code, and I hope that you can hydrate some files,free up space and then reproduce the issue again.I think this will reproduce it.
Thanks very much.

Rita Han - MSFT 2,161 Reputation points

2020-11-10T08:46:57.037+00:00

I did hydrate and free, but it still works for me.

Nayuta 6 Reputation points

2020-11-10T08:56:42.887+00:00

Thanks a lot.I will double check the code and report later.
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Rita Han - MSFT 2,161 Reputation points

2020-11-12T07:25:01.057+00:00
Hello @Nayuta ,

Summarize this issue and hope it will help others in the future:

After following the same steps and doing the same tests on my local machine and a VM, I failed to reproduce this issue because it always works for me.

Thanks @Nayuta 's update and it turns out to be a specific environment related issue.

Environment issue may be caused by many factors like changes applied to the system, corrupt system files etc. But if we can narrow down it is an environment related issue, it will be a great help to solve the issue. One suggestion is doing the same test on a new and clean set-up environment, or on multiple machines, to exclude other factors.

Open to any possible cause for this issue and will update here if I can find more.

Thank you!

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The AckRename callback of Windows cfapi blocks when move multiple files at the same time

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