From fd2b007eaec898564e269d1f478a2da0380ecf51 Mon Sep 17 00:00:00 2001
From: Qu Wenruo <wqu@suse.com>
Date: Thu, 17 Oct 2019 10:38:36 +0800
Git-commit: fd2b007eaec898564e269d1f478a2da0380ecf51
References: bsc#1155184
Patch-mainline: v5.4-rc5
Subject: [PATCH] btrfs: tracepoints: Fix wrong parameter order for qgroup
 events

[BUG]
For btrfs:qgroup_meta_reserve event, the trace event can output garbage:

  qgroup_meta_reserve: 9c7f6acc-b342-4037-bc47-7f6e4d2232d7: refroot=5(FS_TREE) type=DATA diff=2

The diff should always be alinged to sector size (4k), so there is
definitely something wrong.

[CAUSE]
For the wrong @diff, it's caused by wrong parameter order.
The correct parameters are:

  struct btrfs_root, s64 diff, int type.

However the parameters used are:

  struct btrfs_root, int type, s64 diff.

Fixes: 4ee0d8832c2e ("btrfs: qgroup: Update trace events for metadata reservation")
CC: stable@vger.kernel.org # 4.19+
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---
 fs/btrfs/qgroup.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -3559,7 +3559,7 @@ int __btrfs_qgroup_reserve_meta(struct b
 		return 0;
 
 	BUG_ON(num_bytes != round_down(num_bytes, fs_info->nodesize));
-	trace_qgroup_meta_reserve(root, type, (s64)num_bytes);
+	trace_qgroup_meta_reserve(root, (s64)num_bytes, type);
 	ret = qgroup_reserve(root, num_bytes, enforce, type);
 	if (ret < 0)
 		return ret;
@@ -3606,7 +3606,7 @@ void __btrfs_qgroup_free_meta(struct btr
 	 */
 	num_bytes = sub_root_meta_rsv(root, num_bytes, type);
 	BUG_ON(num_bytes != round_down(num_bytes, fs_info->nodesize));
-	trace_qgroup_meta_reserve(root, type, -(s64)num_bytes);
+	trace_qgroup_meta_reserve(root, -(s64)num_bytes, type);
 	btrfs_qgroup_free_refroot(fs_info, root->objectid, num_bytes, type);
 }