[PATCH] f2fs: modify task name prefix

[Guowei Du]

From: duguowei <duguowei@xxxxxxxxxx>

If there are more than one f2fs sbi, there will be more
discard threads. But the comm is too long to show dev
minor. So, change the default prefix of thread from
"f2fs_discard" to "f2fs_dcd".

Before:
$ ps -e | grep f2fs
1628 ?        00:00:00 f2fs_ckpt-7:10
1629 ?        00:00:00 f2fs_flush-7:10
1630 ?        00:00:00 f2fs_discard-7:
1631 ?        00:00:00 f2fs_gc-7:10
2030 ?        00:00:00 f2fs_ckpt-7:27
2031 ?        00:00:00 f2fs_flush-7:27
2032 ?        00:00:00 f2fs_discard-7:
2033 ?        00:00:00 f2fs_gc-7:27

After:
$ ps -e | grep f2fs
1628 ?        00:00:00 f2fs_ckpt-7:10
1629 ?        00:00:00 f2fs_flush-7:10
1630 ?        00:00:00 f2fs_dcd-7:10
1631 ?        00:00:00 f2fs_gc-7:10
2030 ?        00:00:00 f2fs_ckpt-7:27
2031 ?        00:00:00 f2fs_flush-7:27
2032 ?        00:00:00 f2fs_dcd-7:27
2033 ?        00:00:00 f2fs_gc-7:27

Signed-off-by: duguowei <duguowei@xxxxxxxxxx>
---
 fs/f2fs/segment.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 874c1b9c41a2..2eeefcbe62db 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2018,7 +2018,7 @@ int f2fs_start_discard_thread(struct f2fs_sb_info *sbi)
 		return 0;
 
 	dcc->f2fs_issue_discard = kthread_run(issue_discard_thread, sbi,
-				"f2fs_discard-%u:%u", MAJOR(dev), MINOR(dev));
+				"f2fs_dcd-%u:%u", MAJOR(dev), MINOR(dev));
 	if (IS_ERR(dcc->f2fs_issue_discard))
 		err = PTR_ERR(dcc->f2fs_issue_discard);
 
-- 
2.36.1