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 -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html