btrfs: pass fs_info to functions that search for delayed ref heads

One of the following patches in the series will need to access fs_info in
the function find_ref_head(), so pass a fs_info argument to it as well as
to the functions btrfs_select_ref_head() and btrfs_find_delayed_ref_head()
which call find_ref_head().

Reviewed-by: Boris Burkov <boris@bur.io>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/backref.c

@@ -1442,7 +1442,8 @@ static int find_parent_nodes(struct btrfs_backref_walk_ctx *ctx,
 		 */
 		delayed_refs = &ctx->trans->transaction->delayed_refs;
 		spin_lock(&delayed_refs->lock);
-		head = btrfs_find_delayed_ref_head(delayed_refs, ctx->bytenr);
+		head = btrfs_find_delayed_ref_head(ctx->fs_info, delayed_refs,
+						   ctx->bytenr);
 		if (head) {
 			if (!mutex_trylock(&head->mutex)) {
 				refcount_inc(&head->refs);

fs/btrfs/delayed-ref.c

@@ -399,6 +399,7 @@ static struct btrfs_delayed_ref_head *find_first_ref_head(
  * is given, the next bigger entry is returned if no exact match is found.
  */
 static struct btrfs_delayed_ref_head *find_ref_head(
+		const struct btrfs_fs_info *fs_info,
 		struct btrfs_delayed_ref_root *dr, u64 bytenr,
 		bool return_bigger)
 {
@@ -558,15 +559,16 @@ int btrfs_check_delayed_seq(struct btrfs_fs_info *fs_info, u64 seq)
 }
 
 struct btrfs_delayed_ref_head *btrfs_select_ref_head(
+		const struct btrfs_fs_info *fs_info,
 		struct btrfs_delayed_ref_root *delayed_refs)
 {
 	struct btrfs_delayed_ref_head *head;
 	bool locked;
 
 	spin_lock(&delayed_refs->lock);
 again:
-	head = find_ref_head(delayed_refs, delayed_refs->run_delayed_start,
-			     true);
+	head = find_ref_head(fs_info, delayed_refs,
+			     delayed_refs->run_delayed_start, true);
 	if (!head && delayed_refs->run_delayed_start != 0) {
 		delayed_refs->run_delayed_start = 0;
 		head = find_first_ref_head(delayed_refs);
@@ -1188,11 +1190,13 @@ void btrfs_put_delayed_ref(struct btrfs_delayed_ref_node *ref)
  * head node if found, or NULL if not.
  */
 struct btrfs_delayed_ref_head *
-btrfs_find_delayed_ref_head(struct btrfs_delayed_ref_root *delayed_refs, u64 bytenr)
+btrfs_find_delayed_ref_head(const struct btrfs_fs_info *fs_info,
+			    struct btrfs_delayed_ref_root *delayed_refs,
+			    u64 bytenr)
 {
 	lockdep_assert_held(&delayed_refs->lock);
 
-	return find_ref_head(delayed_refs, bytenr, false);
+	return find_ref_head(fs_info, delayed_refs, bytenr, false);
 }
 
 static int find_comp(struct btrfs_delayed_ref_node *entry, u64 root, u64 parent)

fs/btrfs/delayed-ref.h

@@ -367,7 +367,8 @@ void btrfs_merge_delayed_refs(struct btrfs_fs_info *fs_info,
 			      struct btrfs_delayed_ref_head *head);
 
 struct btrfs_delayed_ref_head *
-btrfs_find_delayed_ref_head(struct btrfs_delayed_ref_root *delayed_refs,
+btrfs_find_delayed_ref_head(const struct btrfs_fs_info *fs_info,
+			    struct btrfs_delayed_ref_root *delayed_refs,
 			    u64 bytenr);
 static inline void btrfs_delayed_ref_unlock(struct btrfs_delayed_ref_head *head)
 {
@@ -377,6 +378,7 @@ void btrfs_delete_ref_head(struct btrfs_delayed_ref_root *delayed_refs,
 			   struct btrfs_delayed_ref_head *head);
 
 struct btrfs_delayed_ref_head *btrfs_select_ref_head(
+		const struct btrfs_fs_info *fs_info,
 		struct btrfs_delayed_ref_root *delayed_refs);
 void btrfs_unselect_ref_head(struct btrfs_delayed_ref_root *delayed_refs,
 			     struct btrfs_delayed_ref_head *head);

fs/btrfs/extent-tree.c

@@ -182,7 +182,7 @@ int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
 
 	delayed_refs = &trans->transaction->delayed_refs;
 	spin_lock(&delayed_refs->lock);
-	head = btrfs_find_delayed_ref_head(delayed_refs, bytenr);
+	head = btrfs_find_delayed_ref_head(fs_info, delayed_refs, bytenr);
 	if (head) {
 		if (!mutex_trylock(&head->mutex)) {
 			refcount_inc(&head->refs);
@@ -2049,7 +2049,7 @@ static noinline int __btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
 
 	do {
 		if (!locked_ref) {
-			locked_ref = btrfs_select_ref_head(delayed_refs);
+			locked_ref = btrfs_select_ref_head(fs_info, delayed_refs);
 			if (IS_ERR_OR_NULL(locked_ref)) {
 				if (PTR_ERR(locked_ref) == -EAGAIN) {
 					continue;
@@ -2251,7 +2251,7 @@ static noinline int check_delayed_ref(struct btrfs_root *root,
 
 	delayed_refs = &cur_trans->delayed_refs;
 	spin_lock(&delayed_refs->lock);
-	head = btrfs_find_delayed_ref_head(delayed_refs, bytenr);
+	head = btrfs_find_delayed_ref_head(root->fs_info, delayed_refs, bytenr);
 	if (!head) {
 		spin_unlock(&delayed_refs->lock);
 		btrfs_put_transaction(cur_trans);
@@ -3359,7 +3359,7 @@ 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(delayed_refs, bytenr);
+	head = btrfs_find_delayed_ref_head(trans->fs_info, delayed_refs, bytenr);
 	if (!head)
 		goto out_delayed_unlock;
 
@@ -5494,7 +5494,7 @@ static int check_ref_exists(struct btrfs_trans_handle *trans,
 	 */
 	delayed_refs = &trans->transaction->delayed_refs;
 	spin_lock(&delayed_refs->lock);
-	head = btrfs_find_delayed_ref_head(delayed_refs, bytenr);
+	head = btrfs_find_delayed_ref_head(root->fs_info, delayed_refs, bytenr);
 	if (!head)
 		goto out;
 	if (!mutex_trylock(&head->mutex)) {