Herbert Valerio Riedel wrote: > what I'm not sure about, is the reason of the addition of > > if(S_ISREG(inode->i_mode)) bs = BLOCK_SIZE; > > since BLOCK_SIZE is defined to be (1 << 10) in fs.h File backed loop device on 4k block size ext2 filesystem: debian:/root # dd if=/dev/zero of=file1 bs=1024 count=10 10+0 records in 10+0 records out debian:/root # losetup /dev/loop0 file1 debian:/root # dd if=/dev/zero of=/dev/loop0 bs=1024 count=10 conv=notrunc dd: /dev/loop0: No space left on device <=====ERROR===== 9+0 records in 8+0 records out debian:/root # tune2fs -l /dev/hda1 2>&1| grep "Block size" Block size: 4096 debian:/root # uname -a Linux debian 2.4.6-pre5 #1 Thu Jun 21 14:27:25 EEST 2001 i686 unknown Loop driver in kernel 2.4.5 is ok, loop driver in 2.4.6 is not. > finally, code to initialize the aes module have been hardcoded into loop.c > this is IMHO a rather static approach, since unflexible, if it wasn't for > this one, the modified loop.c could be easily used as drop in replacament > for the cryptoapi, but nevertheless it might be possible to use cryptoapi > with minor adaptions with the loop-AES modified loop-AES' loop.o. I'll > investigate this one a little bit more, this might finally allow for > backporting the cryptoapi to 2.2 by making use of jari's 2.2 > modifications. Your code uses loop_register_transfer(). I see no obvious reasons why loop-AES' loop.o would prevent your code from registering cipher id 18 (LO_CRYPT_CRYPTOAPI). Only id 16 (LO_CRYPT_AES) is preregistered. > *) loop-AES' aes.c can be seen as specialized case (don't take me too > literal here please) of an AES cipher. whereas the cryptapi's loop > filter makes use of the cryptoapi framework to chose among the > available (not even required to be known in advance) cipher > algorithms. loop-AES' aes.[ch] are as portable as code can be. They work in Linux kernel, Linux userspace, FreeBSD, OpenBSD, just about anywhere. They can also be easily tested against published test vectors in userspace. Regards, Jari Ruusu <jari.ruusu@xxxxxxxxxx> Linux-crypto: cryptography in and on the Linux system Archive: http://mail.nl.linux.org/linux-crypto/
