From: Ingo Franzki <ifranzki@linux.ibm.com>
To: Karel Zak <kzak@redhat.com>
Cc: Ming Lei <ming.lei@redhat.com>, Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
Juergen Christ <jchrist@linux.ibm.com>
Subject: Re: loop_set_block_size: loop0 () has still dirty pages (nrpages=2)
Date: Wed, 16 Jun 2021 09:22:17 +0200 [thread overview]
Message-ID: <72939177-a284-b5b6-e75e-2de9ab989bb4@linux.ibm.com> (raw)
In-Reply-To: <20210615084259.yj5pmyjonfqcg7lg@ws.net.home>
On 15.06.2021 10:42, Karel Zak wrote:
> On Mon, Jun 14, 2021 at 09:35:30AM +0200, Ingo Franzki wrote:
>> However, shouldn't then the losetup userspace utility implement some kind of retry logic in case of -EAGAIN ?
>> I don't see that in the source of losetup.c nor in loopdev.c in the util-linux package. There is a retry loop in create_loop() in losetup.c retrying loopcxt_setup_device() in case of EBUSY, but not in case of EAGAIN.
>>
>> And losetup also hides the original error code and just returns EXIT_FAILURE in case of a failure. So no real good chance for the script that uses losetup to catch that error situation and perform a retry itself.
>>
>> Adding Karel Zak (the maintainer of util-linux).
>>
>> @Karel Zak: How about adding EAGAIN to the condition for performing a retry?
>>
>> Something like this:
>>
>> - if (errno == EBUSY && !hasdev && ntries < 64) {
>> + if ((errno == EBUSY || errno == EAGAIN) && !hasdev && ntries < 64) {
>> xusleep(200000);
>> ntries++;
>> continue;
>> }
>
> EAGAIN sounds like the best reason to try it again :-)
>
> Committed, it will be also available in v2.37.1.
Thanks a lot for the quick resolution!
Do you by any chance know if Fedora 34 will be updated with v2.37.1?
I guess Fedora 35 will get it in any case.
>
> Karel
>
>
--
Ingo Franzki
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next prev parent reply other threads:[~2021-06-16 7:22 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-08 12:01 Ingo Franzki
2021-06-10 14:45 ` Ming Lei
2021-06-14 7:35 ` Ingo Franzki
2021-06-14 22:37 ` Ming Lei
2021-06-15 8:06 ` Jan Kara
2021-06-15 8:42 ` Karel Zak
2021-06-16 7:22 ` Ingo Franzki [this message]
2021-06-16 7:44 ` Karel Zak
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