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authorMilan Broz <mbroz@redhat.com>2008-07-21 12:00:40 +0100
committerAlasdair G Kergon <agk@redhat.com>2008-07-21 12:00:40 +0100
commitd41e26b901111f4e540aa2c27ec7a1681c782be9 (patch)
tree7f05c209b92c0dfc2a96daeac3a4812f34b70b10 /drivers
parent9980c638a666ecd88acaf0a7ab91043d4a3f44d1 (diff)
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 <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/md/dm-crypt.c18
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index ab6a61db63c..13956437bc8 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)