Re: dm-crypt using kthread

[Jeff Garzik <jgarzik@pobox.com>]

Christophe Saout wrote:
> +static void kcryptd_do_work(void *data)
> +{
> +	struct crypt_io *io = (struct crypt_io *) data;
> +	struct crypt_config *cc = (struct crypt_config *) io->target->private;
> +	struct convert_context ctx;
> +	int r;
> +
> +	crypt_convert_init(cc, &ctx, io->bio, io->bio,
> +	                   io->bio->bi_sector - io->target->begin, 0);
> +	r = crypt_convert(cc, &ctx);
> +
> +	dec_pending(io, r);
> +}


> +static void kcryptd_queue_io(struct crypt_io *io)
> +{
> +	/* with the work struct in crypt_io we can only queue whole io's */
> +	BUG_ON(atomic_read(&io->pending) != 1);
> +
> +	INIT_WORK(&io->work, kcryptd_do_work, io);
> +	queue_work(_kcryptd_workqueue, &io->work);
> +}

Yum, nice and small.

Me likee.



> +/*
> + * Construct an encryption mapping:
> + * <cipher> <key> <iv_offset> <dev_path> <start>
> + */
> +static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
> +{
> +	struct crypt_config *cc;
> +	struct crypto_tfm *tfm;
> +	char *tmp;
> +	char *cipher;
> +	char *mode;
> +	int crypto_flags;
> +	int key_size;
> +
> +	if (argc != 5) {
> +		ti->error = "dm-crypt: Not enough arguments";
> +		return -EINVAL;
> +	}
> +
> +	tmp = argv[0];
> +	cipher = strsep(&tmp, "-");
> +	mode = strsep(&tmp, "-");
> +
> +	if (tmp)
> +		DMWARN("dm-crypt: Unexpected additional cipher options");

Janitorial/cleanup:  I define a macro "PFX" in most of my drivers, which 
in this case would look like

#define MODNAME "dm-crypt"
#define PFX MODNAME ": "

This is IMO preferred over typing in the driver's name into bunches of 
strings.


Your code looks OK-to-merge to me, at this point.

	Jeff