btrfs: locking: rename __btrfs_tree_lock() and __btrfs_tree_read_lock()

The __btrfs_tree_lock() and __btrfs_tree_read_lock() are using a naming
with a double underscore prefix, which is specially not proper for
exported functions. Remove the double underscore prefix from their name
and add the "_nested" suffix.
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
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/ctree.c

@@ -1003,7 +1003,7 @@ static noinline int balance_level(struct btrfs_trans_handle *trans,
 			goto out;
 		}
 
-		__btrfs_tree_lock(left, BTRFS_NESTING_LEFT);
+		btrfs_tree_lock_nested(left, BTRFS_NESTING_LEFT);
 		wret = btrfs_cow_block(trans, root, left,
 				       parent, pslot - 1, &left,
 				       BTRFS_NESTING_LEFT_COW);
@@ -1021,7 +1021,7 @@ static noinline int balance_level(struct btrfs_trans_handle *trans,
 			goto out;
 		}
 
-		__btrfs_tree_lock(right, BTRFS_NESTING_RIGHT);
+		btrfs_tree_lock_nested(right, BTRFS_NESTING_RIGHT);
 		wret = btrfs_cow_block(trans, root, right,
 				       parent, pslot + 1, &right,
 				       BTRFS_NESTING_RIGHT_COW);
@@ -1205,7 +1205,7 @@ static noinline int push_nodes_for_insert(struct btrfs_trans_handle *trans,
 		if (IS_ERR(left))
 			return PTR_ERR(left);
 
-		__btrfs_tree_lock(left, BTRFS_NESTING_LEFT);
+		btrfs_tree_lock_nested(left, BTRFS_NESTING_LEFT);
 
 		left_nr = btrfs_header_nritems(left);
 		if (left_nr >= BTRFS_NODEPTRS_PER_BLOCK(fs_info) - 1) {
@@ -1265,7 +1265,7 @@ static noinline int push_nodes_for_insert(struct btrfs_trans_handle *trans,
 		if (IS_ERR(right))
 			return PTR_ERR(right);
 
-		__btrfs_tree_lock(right, BTRFS_NESTING_RIGHT);
+		btrfs_tree_lock_nested(right, BTRFS_NESTING_RIGHT);
 
 		right_nr = btrfs_header_nritems(right);
 		if (right_nr >= BTRFS_NODEPTRS_PER_BLOCK(fs_info) - 1) {
@@ -3267,7 +3267,7 @@ static int push_leaf_right(struct btrfs_trans_handle *trans, struct btrfs_root
 	if (IS_ERR(right))
 		return PTR_ERR(right);
 
-	__btrfs_tree_lock(right, BTRFS_NESTING_RIGHT);
+	btrfs_tree_lock_nested(right, BTRFS_NESTING_RIGHT);
 
 	free_space = btrfs_leaf_free_space(right);
 	if (free_space < data_size)
@@ -3483,7 +3483,7 @@ static int push_leaf_left(struct btrfs_trans_handle *trans, struct btrfs_root
 	if (IS_ERR(left))
 		return PTR_ERR(left);
 
-	__btrfs_tree_lock(left, BTRFS_NESTING_LEFT);
+	btrfs_tree_lock_nested(left, BTRFS_NESTING_LEFT);
 
 	free_space = btrfs_leaf_free_space(left);
 	if (free_space < data_size) {

fs/btrfs/extent-tree.c

@@ -5101,7 +5101,7 @@ btrfs_init_new_buffer(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 	 */
 	btrfs_set_buffer_lockdep_class(lockdep_owner, buf, level);
 
-	__btrfs_tree_lock(buf, nest);
+	btrfs_tree_lock_nested(buf, nest);
 	btrfs_clear_buffer_dirty(trans, buf);
 	clear_bit(EXTENT_BUFFER_STALE, &buf->bflags);
 	clear_bit(EXTENT_BUFFER_ZONED_ZEROOUT, &buf->bflags);

fs/btrfs/locking.c

@@ -129,14 +129,14 @@ static void btrfs_set_eb_lock_owner(struct extent_buffer *eb, pid_t owner) { }
  */
 
 /*
- * __btrfs_tree_read_lock - lock extent buffer for read
+ * btrfs_tree_read_lock_nested - lock extent buffer for read
  * @eb:		the eb to be locked
  * @nest:	the nesting level to be used for lockdep
  *
  * This takes the read lock on the extent buffer, using the specified nesting
  * level for lockdep purposes.
  */
-void __btrfs_tree_read_lock(struct extent_buffer *eb, enum btrfs_lock_nesting nest)
+void btrfs_tree_read_lock_nested(struct extent_buffer *eb, enum btrfs_lock_nesting nest)
 {
 	u64 start_ns = 0;
 
@@ -193,7 +193,7 @@ void btrfs_tree_read_unlock(struct extent_buffer *eb)
  *
  * Returns with the eb->lock write locked.
  */
-void __btrfs_tree_lock(struct extent_buffer *eb, enum btrfs_lock_nesting nest)
+void btrfs_tree_lock_nested(struct extent_buffer *eb, enum btrfs_lock_nesting nest)
 	__acquires(&eb->lock)
 {
 	u64 start_ns = 0;

fs/btrfs/locking.h

@@ -163,20 +163,20 @@ enum btrfs_lockdep_trans_states {
 static_assert(BTRFS_NESTING_MAX <= MAX_LOCKDEP_SUBCLASSES,
 	      "too many lock subclasses defined");
 
-void __btrfs_tree_lock(struct extent_buffer *eb, enum btrfs_lock_nesting nest);
+void btrfs_tree_lock_nested(struct extent_buffer *eb, enum btrfs_lock_nesting nest);
 
 static inline void btrfs_tree_lock(struct extent_buffer *eb)
 {
-	__btrfs_tree_lock(eb, BTRFS_NESTING_NORMAL);
+	btrfs_tree_lock_nested(eb, BTRFS_NESTING_NORMAL);
 }
 
 void btrfs_tree_unlock(struct extent_buffer *eb);
 
-void __btrfs_tree_read_lock(struct extent_buffer *eb, enum btrfs_lock_nesting nest);
+void btrfs_tree_read_lock_nested(struct extent_buffer *eb, enum btrfs_lock_nesting nest);
 
 static inline void btrfs_tree_read_lock(struct extent_buffer *eb)
 {
-	__btrfs_tree_read_lock(eb, BTRFS_NESTING_NORMAL);
+	btrfs_tree_read_lock_nested(eb, BTRFS_NESTING_NORMAL);
 }
 
 void btrfs_tree_read_unlock(struct extent_buffer *eb);