linux-kernel - Re: [PATCH v8 01/20] crypto: change transient busy return code to -EAGAIN

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Date:   Sat, 7 Oct 2017 10:51:42 +0300
From:   Gilad Ben-Yossef <gilad@...yossef.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jonathan Corbet <corbet@....net>,
        David Howells <dhowells@...hat.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Gary Hook <gary.hook@....com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Arnaud Ebalard <arno@...isbad.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>,
        device-mapper development <dm-devel@...hat.com>,
        Shaohua Li <shli@...nel.org>, Steve French <sfrench@...ba.org>,
        "Theodore Y. Ts'o" <tytso@....edu>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        James Morris <james.l.morris@...cle.com>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
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        Linux kernel mailing list <linux-kernel@...r.kernel.org>,
        keyrings@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
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        Ofir Drang <ofir.drang@....com>
Subject: Re: [PATCH v8 01/20] crypto: change transient busy return code to -EAGAIN

On Sat, Oct 7, 2017 at 6:05 AM, Herbert Xu <herbert@...dor.apana.org.au> wrote:
> On Tue, Sep 05, 2017 at 03:38:40PM +0300, Gilad Ben-Yossef wrote:
>>
>> diff --git a/crypto/algif_hash.c b/crypto/algif_hash.c
>> index 5e92bd2..3b3c154 100644
>> --- a/crypto/algif_hash.c
>> +++ b/crypto/algif_hash.c
>> @@ -39,6 +39,20 @@ struct algif_hash_tfm {
>>       bool has_key;
>>  };
>>
>> +/* Previous versions of crypto_* ops used to return -EBUSY
>> + * rather than -EAGAIN to indicate being tied up. The in
>> + * kernel API changed but we don't want to break the user
>> + * space API. As only the hash user interface exposed this
>> + * error ever to the user, do the translation here.
>> + */
>> +static inline int crypto_user_err(int err)
>> +{
>> +     if (err == -EAGAIN)
>> +             return -EBUSY;
>> +
>> +     return err;
>
> I don't see the need to carry along this baggage.  Does anyone
> in user-space actually rely on EBUSY?


I am not aware of anyone who does. I was just trying to avoid
changing the user ABI.

Shall I roll a new revision without this patch?

Thanks,
Gilad

>
> Cheers,
> --
> Email: Herbert Xu <herbert@...dor.apana.org.au>
> Home Page: http://gondor.apana.org.au/~herbert/
> PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt



-- 
Gilad Ben-Yossef
Chief Coffee Drinker

"If you take a class in large-scale robotics, can you end up in a
situation where the homework eats your dog?"
 -- Jean-Baptiste Queru