linux-kernel - Re: [PROBLEM] nbd requests become stuck when devices watched by inotify emit udev uevent changes

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Date:   Mon, 16 May 2022 20:53:21 +0800
From:   "yukuai (C)" <yukuai3@...wei.com>
To:     Josef Bacik <josef@...icpanda.com>
CC:     Matthew Ruffell <matthew.ruffell@...onical.com>,
        Jens Axboe <axboe@...nel.dk>,
        linux-block <linux-block@...r.kernel.org>,
        nbd <nbd@...er.debian.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PROBLEM] nbd requests become stuck when devices watched by
 inotify emit udev uevent changes

在 2022/05/16 20:17, Josef Bacik 写道:

>> Hi, Josef
>>
>> This seems to try to fix the same problem that I described here:
>>
>> nbd: fix io hung while disconnecting device
>> https://lists.debian.org/nbd/2022/04/msg00207.html
>>
>> There are still some io that are stuck, which means the devcie is
>> probably still opened. Thus nbd_config_put() can't reach here.
>> I'm afraid this patch can't fix the io hung.
>>
>> Matthew, can you try a test with this patch together with my patch below
>> to comfirm my thought?
>>
>> nbd: don't clear 'NBD_CMD_INFLIGHT' flag if request is not completed
>> https://lists.debian.org/nbd/2022/04/msg00212.html.
>>
> 
> Re-submit this one, but fix it so we just test the bit to see if we need to skip
> it, and change it so we only CLEAR when we're sure we're going to complete the
> request.  Thanks,

Ok, thanks for your advice. I'll send a new version.

BTW, do you have any suggestions on other patches of the patchset?

https://lore.kernel.org/all/20220426130746.885140-1-yukuai3@huawei.com/

Thanks,
Kuai
> 
> Josef
> .
>