From d41e26b901111f4e540aa2c27ec7a1681c782be9 Mon Sep 17 00:00:00 2001 From: Milan Broz Date: Mon, 21 Jul 2008 12:00:40 +0100 Subject: dm crypt: add merge This patch implements biovec merge function for crypt target. If the underlying device has merge function defined, call it. If not, keep precomputed value. Signed-off-by: Milan Broz Signed-off-by: Alasdair G Kergon --- drivers/md/dm-crypt.c | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c index ab6a61db63ce..13956437bc81 100644 --- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -1216,9 +1216,24 @@ error: return -EINVAL; } +static int crypt_merge(struct dm_target *ti, struct bvec_merge_data *bvm, + struct bio_vec *biovec, int max_size) +{ + struct crypt_config *cc = ti->private; + struct request_queue *q = bdev_get_queue(cc->dev->bdev); + + if (!q->merge_bvec_fn) + return max_size; + + bvm->bi_bdev = cc->dev->bdev; + bvm->bi_sector = cc->start + bvm->bi_sector - ti->begin; + + return min(max_size, q->merge_bvec_fn(q, bvm, biovec)); +} + static struct target_type crypt_target = { .name = "crypt", - .version= {1, 5, 0}, + .version= {1, 6, 0}, .module = THIS_MODULE, .ctr = crypt_ctr, .dtr = crypt_dtr, @@ -1228,6 +1243,7 @@ static struct target_type crypt_target = { .preresume = crypt_preresume, .resume = crypt_resume, .message = crypt_message, + .merge = crypt_merge, }; static int __init dm_crypt_init(void) -- cgit v1.2.3