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| author | Milan Broz <mbroz@redhat.com> | 2008-07-21 12:00:40 +0100 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2008-07-21 12:00:40 +0100 |
| commit | d41e26b901111f4e540aa2c27ec7a1681c782be9 (patch) | |
| tree | 7f05c209b92c0dfc2a96daeac3a4812f34b70b10 /drivers/md | |
| parent | 9980c638a666ecd88acaf0a7ab91043d4a3f44d1 (diff) | |
| download | blackbird-op-linux-d41e26b901111f4e540aa2c27ec7a1681c782be9.tar.gz blackbird-op-linux-d41e26b901111f4e540aa2c27ec7a1681c782be9.zip | |
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/md')
| -rw-r--r-- | drivers/md/dm-crypt.c | 18 |
1 files changed, 17 insertions, 1 deletions
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) |
