dm crypt: export sysfs of kcryptd workqueue

It should be helpful to export sysfs of "kcryptd" workqueue in some
cases, such as setting specific CPU affinity of the workqueue.

Besides, also tweak the name format a little. The slash inside a
directory name will be translate into exclamation mark, such as
/sys/devices/virtual/workqueue/'kcryptd!253:0'.

Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 5379113..5f9f9b3 100644 (file)
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -3166,11 +3166,12 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv)
        }
 
        if (test_bit(DM_CRYPT_SAME_CPU, &cc->flags))
-               cc->crypt_queue = alloc_workqueue("kcryptd/%s", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM,
+               cc->crypt_queue = alloc_workqueue("kcryptd-%s", WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM,
                                                  1, devname);
        else
-               cc->crypt_queue = alloc_workqueue("kcryptd/%s",
-                                                 WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM | WQ_UNBOUND,
+               cc->crypt_queue = alloc_workqueue("kcryptd-%s",
+                                                 WQ_CPU_INTENSIVE | WQ_MEM_RECLAIM |
+                                                 WQ_UNBOUND | WQ_SYSFS,
                                                  num_online_cpus(), devname);
        if (!cc->crypt_queue) {
                ti->error = "Couldn't create kcryptd queue";