linux-kernel - Re: [PATCH-next 2/3] crypto: api - Provide gfp mask for tfm allocation

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Date:   Thu, 15 Jun 2023 16:38:49 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     Dmitry Safonov <dima@...sta.com>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        linux-kernel@...r.kernel.org, Bob Gilligan <gilligan@...sta.com>,
        David Ahern <dsahern@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Francesco Ruggeri <fruggeri05@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Salam Noureddine <noureddine@...sta.com>,
        linux-crypto@...r.kernel.org
Subject: Re: [PATCH-next 2/3] crypto: api - Provide gfp mask for tfm
 allocation

On Wed, Jun 14, 2023 at 06:46:42PM +0100, Dmitry Safonov wrote:
> diff --git a/crypto/cipher.c b/crypto/cipher.c
> index d39ef5f72ab8..184188339a4a 100644
> --- a/crypto/cipher.c
> +++ b/crypto/cipher.c
> @@ -102,7 +102,7 @@ struct crypto_cipher *crypto_clone_cipher(struct crypto_cipher *cipher)
>  		return ERR_PTR(-ENOSYS);
>  
>  	ntfm = __crypto_alloc_tfm(alg, CRYPTO_ALG_TYPE_CIPHER,
> -				  CRYPTO_ALG_TYPE_MASK);
> +				  CRYPTO_ALG_TYPE_MASK, GFP_ATOMIC);
>  	if (IS_ERR(ntfm))
>  		return ERR_CAST(ntfm);
>  

Should crypto_clone_cipher() not have a gfp_t argument itself?

I'm wondering if any users of the crypto_clone_*() functions will need anything
other than GFP_ATOMIC, such as GFP_NOFS or GFP_NOIO.

FWIW, btrfs's support for fscrypt is planned to use per-extent keys.  It's
challenging to implement.  I've been thinking it might need a
crypto_clone_skcipher() function that it can use during filesystem I/O.  That
use case would want GFP_NOFS, I think.

- Eric