dm crypt: support flush
authorMikulas Patocka <mpatocka@redhat.com>
Mon, 22 Jun 2009 09:12:23 +0000 (10:12 +0100)
committerAlasdair G Kergon <agk@redhat.com>
Mon, 22 Jun 2009 09:12:23 +0000 (10:12 +0100)
Flush support for dm-crypt target.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
drivers/md/dm-crypt.c

index 53394e863c749db9444ab4ae4780b06a61afb8f1..04db6c4004a8c387d6c361f7ce036173fa2e6bfb 100644 (file)
@@ -1132,6 +1132,7 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
                goto bad_crypt_queue;
        }
 
+       ti->num_flush_requests = 1;
        ti->private = cc;
        return 0;
 
@@ -1189,6 +1190,13 @@ static int crypt_map(struct dm_target *ti, struct bio *bio,
                     union map_info *map_context)
 {
        struct dm_crypt_io *io;
+       struct crypt_config *cc;
+
+       if (unlikely(bio_empty_barrier(bio))) {
+               cc = ti->private;
+               bio->bi_bdev = cc->dev->bdev;
+               return DM_MAPIO_REMAPPED;
+       }
 
        io = crypt_io_alloc(ti, bio, bio->bi_sector - ti->begin);