md: Improve name of threads created by md_register_thread

The management thread for raid4,5,6 arrays are all called
mdX_raid5, independent of the actual raid level, which is wrong and
can be confusion.

So change md_register_thread to use the name from the personality
unless no alternate name (like 'resync' or 'reshape') is given.

This is simpler and more correct.

Cc: Jinzc <zhenchengjin@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index f64b33085255..a3dd3c8ea681 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -4218,7 +4218,7 @@ static int do_md_run(mddev_t * mddev)
                         set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
                         mddev->sync_thread = md_register_thread(md_do_sync,
                                                                 mddev,
-                                                                "%s_resync");
+                                                                "resync");
                         if (!mddev->sync_thread) {
                                 printk(KERN_ERR "%s: could not start resync"
                                        " thread...\n",
@@ -5631,7 +5631,10 @@ mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
         thread->run = run;
         thread->mddev = mddev;
         thread->timeout = MAX_SCHEDULE_TIMEOUT;
-        thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
+        thread->tsk = kthread_run(md_thread, thread,
+                                  "%s_%s",
+                                  mdname(thread->mddev),
+                                  name ?: mddev->pers->name);
         if (IS_ERR(thread->tsk)) {
                 kfree(thread);
                 return NULL;
@@ -6745,7 +6748,7 @@ void md_check_recovery(mddev_t *mddev)
                         }
                         mddev->sync_thread = md_register_thread(md_do_sync,
                                                                 mddev,
-                                                                "%s_resync");
+                                                                "resync");
                         if (!mddev->sync_thread) {
                                 printk(KERN_ERR "%s: could not start resync"
                                         " thread...\n",