btrfs: Add qgroup tracing

This patch adds tracepoints to the qgroup code on both the reporting side
(insert_dirty_extents) and the accounting side. Taken together it allows us
to see what qgroup operations have happened, and what their result was.

Signed-off-by: Mark Fasheh <mfasheh@suse.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 7173360eea7a..9e119552ed32 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -1463,6 +1463,7 @@ struct btrfs_qgroup_extent_record
         u64 bytenr = record->bytenr;
 
         assert_spin_locked(&delayed_refs->lock);
+        trace_btrfs_qgroup_insert_dirty_extent(record);
 
         while (*p) {
                 parent_node = *p;
@@ -1594,6 +1595,9 @@ static int qgroup_update_counters(struct btrfs_fs_info *fs_info,
                 cur_old_count = btrfs_qgroup_get_old_refcnt(qg, seq);
                 cur_new_count = btrfs_qgroup_get_new_refcnt(qg, seq);
 
+                trace_qgroup_update_counters(qg->qgroupid, cur_old_count,
+                                             cur_new_count);
+
                 /* Rfer update part */
                 if (cur_old_count == 0 && cur_new_count > 0) {
                         qg->rfer += num_bytes;
@@ -1683,6 +1687,9 @@ btrfs_qgroup_account_extent(struct btrfs_trans_handle *trans,
                 goto out_free;
         BUG_ON(!fs_info->quota_root);
 
+        trace_btrfs_qgroup_account_extent(bytenr, num_bytes, nr_old_roots,
+                                          nr_new_roots);
+
         qgroups = ulist_alloc(GFP_NOFS);
         if (!qgroups) {
                 ret = -ENOMEM;
@@ -1752,6 +1759,8 @@ int btrfs_qgroup_account_extents(struct btrfs_trans_handle *trans,
                 record = rb_entry(node, struct btrfs_qgroup_extent_record,
                                   node);
 
+                trace_btrfs_qgroup_account_extents(record);
+
                 if (!ret) {
                         /*
                          * Use (u64)-1 as time_seq to do special search, which