btrfs: qgroup: Cleanup the old ref_node-oriented mechanism.

Goodbye, the old mechanisim.
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>

fs/btrfs/ctree.h

@@ -1736,7 +1736,7 @@ struct btrfs_fs_info {
 	/* list of dirty qgroups to be written at next commit */
 	struct list_head dirty_qgroups;
 
-	/* used by btrfs_qgroup_record_ref for an efficient tree traversal */
+	/* used by qgroup for an efficient tree traversal */
 	u64 qgroup_seq;
 
 	/* qgroup rescan items */

fs/btrfs/extent-tree.c

@@ -1981,7 +1981,6 @@ static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
 	u64 refs;
 	int ret;
 	int no_quota = node->no_quota;
-	enum btrfs_qgroup_operation_type type = BTRFS_QGROUP_OPER_ADD_EXCL;
 
 	path = btrfs_alloc_path();
 	if (!path)
@@ -2009,8 +2008,6 @@ static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
 	btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
 	item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item);
 	refs = btrfs_extent_refs(leaf, item);
-	if (refs)
-		type = BTRFS_QGROUP_OPER_ADD_SHARED;
 	btrfs_set_extent_refs(leaf, item, refs + refs_to_add);
 	if (extent_op)
 		__run_delayed_extent_op(extent_op, leaf, item);
@@ -6112,7 +6109,6 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
 	u64 bytenr = node->bytenr;
 	u64 num_bytes = node->num_bytes;
 	int last_ref = 0;
-	enum btrfs_qgroup_operation_type type = BTRFS_QGROUP_OPER_SUB_EXCL;
 	bool skinny_metadata = btrfs_fs_incompat(root->fs_info,
 						 SKINNY_METADATA);
 
@@ -6293,7 +6289,6 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
 	refs -= refs_to_drop;
 
 	if (refs > 0) {
-		type = BTRFS_QGROUP_OPER_SUB_SHARED;
 		if (extent_op)
 			__run_delayed_extent_op(extent_op, leaf, ei);
 		/*

fs/btrfs/qgroup.h

@@ -22,45 +22,6 @@
 #include "ulist.h"
 #include "delayed-ref.h"
 
-/*
- * A description of the operations, all of these operations only happen when we
- * are adding the 1st reference for that subvolume in the case of adding space
- * or on the last reference delete in the case of subtraction.  The only
- * exception is the last one, which is added for confusion.
- *
- * BTRFS_QGROUP_OPER_ADD_EXCL: adding bytes where this subvolume is the only
- * one pointing at the bytes we are adding.  This is called on the first
- * allocation.
- *
- * BTRFS_QGROUP_OPER_ADD_SHARED: adding bytes where this bytenr is going to be
- * shared between subvols.  This is called on the creation of a ref that already
- * has refs from a different subvolume, so basically reflink.
- *
- * BTRFS_QGROUP_OPER_SUB_EXCL: removing bytes where this subvolume is the only
- * one referencing the range.
- *
- * BTRFS_QGROUP_OPER_SUB_SHARED: removing bytes where this subvolume shares with
- * refs with other subvolumes.
- */
-enum btrfs_qgroup_operation_type {
-	BTRFS_QGROUP_OPER_ADD_EXCL,
-	BTRFS_QGROUP_OPER_ADD_SHARED,
-	BTRFS_QGROUP_OPER_SUB_EXCL,
-	BTRFS_QGROUP_OPER_SUB_SHARED,
-	BTRFS_QGROUP_OPER_SUB_SUBTREE,
-};
-
-struct btrfs_qgroup_operation {
-	u64 ref_root;
-	u64 bytenr;
-	u64 num_bytes;
-	u64 seq;
-	enum btrfs_qgroup_operation_type type;
-	struct seq_list elem;
-	struct rb_node n;
-	struct list_head list;
-};
-
 /*
  * Record a dirty extent, and info qgroup to update quota on it
  * TODO: Use kmem cache to alloc it.
@@ -93,11 +54,6 @@ int btrfs_limit_qgroup(struct btrfs_trans_handle *trans,
 int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info);
 void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info);
 struct btrfs_delayed_extent_op;
-int btrfs_qgroup_record_ref(struct btrfs_trans_handle *trans,
-			    struct btrfs_fs_info *fs_info, u64 ref_root,
-			    u64 bytenr, u64 num_bytes,
-			    enum btrfs_qgroup_operation_type type,
-			    int mod_seq);
 int btrfs_qgroup_prepare_account_extents(struct btrfs_trans_handle *trans,
 					 struct btrfs_fs_info *fs_info);
 struct btrfs_qgroup_extent_record
@@ -110,11 +66,6 @@ btrfs_qgroup_account_extent(struct btrfs_trans_handle *trans,
 			    struct ulist *old_roots, struct ulist *new_roots);
 int btrfs_qgroup_account_extents(struct btrfs_trans_handle *trans,
 				 struct btrfs_fs_info *fs_info);
-int btrfs_delayed_qgroup_accounting(struct btrfs_trans_handle *trans,
-				    struct btrfs_fs_info *fs_info);
-void btrfs_remove_qgroup_operation(struct btrfs_trans_handle *trans,
-				   struct btrfs_fs_info *fs_info,
-				   struct btrfs_qgroup_operation *oper);
 int btrfs_run_qgroups(struct btrfs_trans_handle *trans,
 		      struct btrfs_fs_info *fs_info);
 int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans,

include/trace/events/btrfs.h

@@ -1117,61 +1117,6 @@ DEFINE_EVENT(btrfs__workqueue_done, btrfs_workqueue_destroy,
 	TP_ARGS(wq)
 );
 
-#define show_oper_type(type)						\
-	__print_symbolic(type,						\
-		{ BTRFS_QGROUP_OPER_ADD_EXCL, 	"OPER_ADD_EXCL" },	\
-		{ BTRFS_QGROUP_OPER_ADD_SHARED, "OPER_ADD_SHARED" },	\
-		{ BTRFS_QGROUP_OPER_SUB_EXCL, 	"OPER_SUB_EXCL" },	\
-		{ BTRFS_QGROUP_OPER_SUB_SHARED,	"OPER_SUB_SHARED" })
-
-DECLARE_EVENT_CLASS(btrfs_qgroup_oper,
-
-	TP_PROTO(struct btrfs_qgroup_operation *oper),
-
-	TP_ARGS(oper),
-
-	TP_STRUCT__entry(
-		__field(	u64,  ref_root		)
-		__field(	u64,  bytenr		)
-		__field(	u64,  num_bytes		)
-		__field(	u64,  seq		)
-		__field(	int,  type		)
-		__field(	u64,  elem_seq		)
-	),
-
-	TP_fast_assign(
-		__entry->ref_root	= oper->ref_root;
-		__entry->bytenr		= oper->bytenr,
-		__entry->num_bytes	= oper->num_bytes;
-		__entry->seq 		= oper->seq;
-		__entry->type		= oper->type;
-		__entry->elem_seq	= oper->elem.seq;
-	),
-
-	TP_printk("ref_root = %llu, bytenr = %llu, num_bytes = %llu, "
-		  "seq = %llu, elem.seq = %llu, type = %s",
-		  (unsigned long long)__entry->ref_root,
-		  (unsigned long long)__entry->bytenr,
-		  (unsigned long long)__entry->num_bytes,
-		  (unsigned long long)__entry->seq,
-		  (unsigned long long)__entry->elem_seq,
-		  show_oper_type(__entry->type))
-);
-
-DEFINE_EVENT(btrfs_qgroup_oper, btrfs_qgroup_account,
-
-	TP_PROTO(struct btrfs_qgroup_operation *oper),
-
-	TP_ARGS(oper)
-);
-
-DEFINE_EVENT(btrfs_qgroup_oper, btrfs_qgroup_record_ref,
-
-	TP_PROTO(struct btrfs_qgroup_operation *oper),
-
-	TP_ARGS(oper)
-);
-
 #endif /* _TRACE_BTRFS_H */
 
 /* This part must be outside protection */