Btrfs: pass delayed_refs directly to btrfs_find_delayed_ref_head

All we need is @delayed_refs, all callers have get it ahead of calling
btrfs_find_delayed_ref_head since lock needs to be acquired firstly,
there is no reason to deference it again inside the function.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

4 files changed, 7 insertions, 9 deletions

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index 8299601a3549..db706595e631 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -1284,7 +1284,7 @@ again:
                  */
                 delayed_refs = &trans->transaction->delayed_refs;
                 spin_lock(&delayed_refs->lock);
-                head = btrfs_find_delayed_ref_head(trans, bytenr);
+                head = btrfs_find_delayed_ref_head(delayed_refs, bytenr);
                 if (head) {
                         if (!mutex_trylock(&head->mutex)) {
                                 atomic_inc(&head->node.refs);
diff --git a/fs/btrfs/delayed-ref.c b/fs/btrfs/delayed-ref.c
index c66f487b76a7..a1b9ef2dfc4a 100644
--- a/fs/btrfs/delayed-ref.c
+++ b/fs/btrfs/delayed-ref.c
@@ -909,11 +909,8 @@ int btrfs_add_delayed_extent_op(struct btrfs_fs_info *fs_info,
  * the head node if any where found, or NULL if not.
  */
 struct btrfs_delayed_ref_head *
-btrfs_find_delayed_ref_head(struct btrfs_trans_handle *trans, u64 bytenr)
+btrfs_find_delayed_ref_head(struct btrfs_delayed_ref_root *delayed_refs, u64 bytenr)
 {
-        struct btrfs_delayed_ref_root *delayed_refs;
-
-        delayed_refs = &trans->transaction->delayed_refs;
         return find_ref_head(&delayed_refs->href_root, bytenr, 0);
 }
 
diff --git a/fs/btrfs/delayed-ref.h b/fs/btrfs/delayed-ref.h
index 8a0220fb703c..0e537f98f1a1 100644
--- a/fs/btrfs/delayed-ref.h
+++ b/fs/btrfs/delayed-ref.h
@@ -261,7 +261,8 @@ void btrfs_merge_delayed_refs(struct btrfs_trans_handle *trans,
                               struct btrfs_delayed_ref_head *head);
 
 struct btrfs_delayed_ref_head *
-btrfs_find_delayed_ref_head(struct btrfs_trans_handle *trans, u64 bytenr);
+btrfs_find_delayed_ref_head(struct btrfs_delayed_ref_root *delayed_refs,
+                            u64 bytenr);
 int btrfs_delayed_ref_lock(struct btrfs_trans_handle *trans,
                            struct btrfs_delayed_ref_head *head);
 static inline void btrfs_delayed_ref_unlock(struct btrfs_delayed_ref_head *head)
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 7dd71fcc1051..be235b30a798 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -888,7 +888,7 @@ search_again:
 
         delayed_refs = &trans->transaction->delayed_refs;
         spin_lock(&delayed_refs->lock);
-        head = btrfs_find_delayed_ref_head(trans, bytenr);
+        head = btrfs_find_delayed_ref_head(delayed_refs, bytenr);
         if (head) {
                 if (!mutex_trylock(&head->mutex)) {
                         atomic_inc(&head->node.refs);
@@ -3041,7 +3041,7 @@ static noinline int check_delayed_ref(struct btrfs_trans_handle *trans,
 
         delayed_refs = &trans->transaction->delayed_refs;
         spin_lock(&delayed_refs->lock);
-        head = btrfs_find_delayed_ref_head(trans, bytenr);
+        head = btrfs_find_delayed_ref_head(delayed_refs, bytenr);
         if (!head) {
                 spin_unlock(&delayed_refs->lock);
                 return 0;
@@ -7091,7 +7091,7 @@ static noinline int check_ref_cleanup(struct btrfs_trans_handle *trans,
 
         delayed_refs = &trans->transaction->delayed_refs;
         spin_lock(&delayed_refs->lock);
-        head = btrfs_find_delayed_ref_head(trans, bytenr);
+        head = btrfs_find_delayed_ref_head(delayed_refs, bytenr);
         if (!head)
                 goto out_delayed_unlock;