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Date:	Tue, 19 May 2015 14:32:11 +0800
From:	Herbert Xu <>
To:	Jaegeuk Kim <>
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.

Email: Herbert Xu <>
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