dm crypt: tidy crypt alloc

Factor out crypt io allocation code.
Later patches will call it from another place.

No functional change.

Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

1 files changed, 17 insertions, 7 deletions

diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 6b9be99eff5..cac064d4aa7 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -517,6 +517,22 @@ static void crypt_free_buffer_pages(struct crypt_config *cc, struct bio *clone)
         }
 }
 
+static struct dm_crypt_io *crypt_io_alloc(struct dm_target *ti,
+                                          struct bio *bio, sector_t sector)
+{
+        struct crypt_config *cc = ti->private;
+        struct dm_crypt_io *io;
+
+        io = mempool_alloc(cc->io_pool, GFP_NOIO);
+        io->target = ti;
+        io->base_bio = bio;
+        io->sector = sector;
+        io->error = 0;
+        atomic_set(&io->pending, 0);
+
+        return io;
+}
+
 static void crypt_inc_pending(struct dm_crypt_io *io)
 {
         atomic_inc(&io->pending);
@@ -1113,15 +1129,9 @@ static void crypt_dtr(struct dm_target *ti)
 static int crypt_map(struct dm_target *ti, struct bio *bio,
                      union map_info *map_context)
 {
-        struct crypt_config *cc = ti->private;
         struct dm_crypt_io *io;
 
-        io = mempool_alloc(cc->io_pool, GFP_NOIO);
-        io->target = ti;
-        io->base_bio = bio;
-        io->sector = bio->bi_sector - ti->begin;
-        io->error = 0;
-        atomic_set(&io->pending, 0);
+        io = crypt_io_alloc(ti, bio, bio->bi_sector - ti->begin);
 
         if (bio_data_dir(io->base_bio) == READ)
                 kcryptd_queue_io(io);