dm io: use slab for struct io

Allocate "struct io" from a slab.

This patch changes dm-io, so that "struct io" is allocated from a slab cache.
It used to be allocated with kmalloc. Allocating from a slab will be needed
for the next patch, because it requires a special alignment of "struct io"
and kmalloc cannot meet this alignment.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 724efc63904d..473f0c3c0192 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -275,6 +275,7 @@ static int (*_inits[])(void) __initdata = {
         dm_target_init,
         dm_linear_init,
         dm_stripe_init,
+        dm_io_init,
         dm_kcopyd_init,
         dm_interface_init,
 };
@@ -284,6 +285,7 @@ static void (*_exits[])(void) = {
         dm_target_exit,
         dm_linear_exit,
         dm_stripe_exit,
+        dm_io_exit,
         dm_kcopyd_exit,
         dm_interface_exit,
 };