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 53791138d78bf4b5296f3aa400f517b60aabe9f4..5f9f9b3a226d7ccad1bedc57c1fede7f1a9c888e 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";