linux-ext4 - Re: [PATCH] crypto: allow to assign gfp_t for __crypto_alloc

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Message-ID: <20150519063211.GA28347@gondor.apana.org.au>
Date:	Tue, 19 May 2015 14:32:11 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Jaegeuk Kim <jaegeuk@...nel.org>
Cc:	davem@...emloft.net, linux-crypto@...r.kernel.org,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net, ecryptfs@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] crypto: allow to assign gfp_t for __crypto_alloc_tfm

On Mon, May 18, 2015 at 11:24:30PM -0700, Jaegeuk Kim wrote:
>
> The call path in fs/ext4/crypto.c is:
>  - writepage
>   - ext4_encrypt
>    - ext4_get_crypto_ctx
>     - crypto_alloc_ablkcipher
> 
> AFAIK, this way can achieve to reduce memory footprint gracefully.
> Just before submitting bios, fs allocates the required memory, and then end_io
> will free them in pair.

So where does the key get generated? The crypto tfm should be
allocated when you generate the key.

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
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