On Tue, May 19, 2015 at 02:32:11PM +0800, Herbert Xu wrote:
> 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.
In fs/ext4/crypto.c,
- writepage
- ext4_encrypt
- ext4_get_crypto_ctx
- crypto_alloc_ablkcipher
- ext4_page_crypto
- crypto_ablkcipher_setkey
- ablkcipher_request_alloc(GFP_NOFS)
- ablkcipher_request_set_crypt(PAGE_CACHE_SIZE)
- crypto_ablkcipher_encrypt
- end_io
- crypto_free_tfm
Thanks,
>
> Cheers,
> --
> Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
> Home Page: http://gondor.apana.org.au/~herbert/
> PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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