f2fs: don't grab superblock freeze for flush/ckpt thread

There are controlled by f2fs_freeze().

This fixes xfstests/generic/068 which is stuck at

 task:f2fs_ckpt-252:3 state:D stack:    0 pid: 5761 ppid:     2 flags:0x00004000
 Call Trace:
  __schedule+0x44c/0x8a0
  schedule+0x4f/0xc0
  percpu_rwsem_wait+0xd8/0x140
  ? percpu_down_write+0xf0/0xf0
  __percpu_down_read+0x56/0x70
  issue_checkpoint_thread+0x12c/0x160 [f2fs]
  ? wait_woken+0x80/0x80
  kthread+0x114/0x150
  ? __checkpoint_and_complete_reqs+0x110/0x110 [f2fs]
  ? kthread_park+0x90/0x90
  ret_from_fork+0x22/0x30
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/checkpoint.c

@@ -1763,13 +1763,9 @@ static int issue_checkpoint_thread(void *data)
 	if (kthread_should_stop())
 		return 0;
 
-	sb_start_intwrite(sbi->sb);
-
 	if (!llist_empty(&cprc->issue_list))
 		__checkpoint_and_complete_reqs(sbi);
 
-	sb_end_intwrite(sbi->sb);
-
 	wait_event_interruptible(*q,
 		kthread_should_stop() || !llist_empty(&cprc->issue_list));
 	goto repeat;

fs/f2fs/segment.c

@@ -607,8 +607,6 @@ static int issue_flush_thread(void *data)
 	if (kthread_should_stop())
 		return 0;
 
-	sb_start_intwrite(sbi->sb);
-
 	if (!llist_empty(&fcc->issue_list)) {
 		struct flush_cmd *cmd, *next;
 		int ret;
@@ -629,8 +627,6 @@ static int issue_flush_thread(void *data)
 		fcc->dispatch_list = NULL;
 	}
 
-	sb_end_intwrite(sbi->sb);
-
 	wait_event_interruptible(*q,
 		kthread_should_stop() || !llist_empty(&fcc->issue_list));
 	goto repeat;

fs/f2fs/super.c

@@ -1472,6 +1472,10 @@ static int f2fs_freeze(struct super_block *sb)
 	/* must be clean, since sync_filesystem() was already called */
 	if (is_sbi_flag_set(F2FS_SB(sb), SBI_IS_DIRTY))
 		return -EINVAL;
+
+	/* ensure no checkpoint required */
+	if (!llist_empty(&F2FS_SB(sb)->cprc_info.issue_list))
+		return -EINVAL;
 	return 0;
 }