Merge tag 'for-6.2/writeback-2022-12-12' of git://git.kernel.dk/linux

Pull writeback updates from Jens Axboe:

 - Sanity check adding freed inodes to lists (Jan)

 - Removal of an old unused define (Miaohe)

* tag 'for-6.2/writeback-2022-12-12' of git://git.kernel.dk/linux:
  writeback: remove obsolete macro EXPIRE_DIRTY_ATIME
  writeback: Add asserts for adding freed inode to lists

Author: torvalds

fs/fs-writeback.c

@@ -121,6 +121,7 @@ static bool inode_io_list_move_locked(struct inode *inode,
 {
 	assert_spin_locked(&wb->list_lock);
 	assert_spin_locked(&inode->i_lock);
+	WARN_ON_ONCE(inode->i_state & I_FREEING);
 
 	list_move(&inode->i_io_list, head);
 
@@ -280,6 +281,7 @@ static void inode_cgwb_move_to_attached(struct inode *inode,
 {
 	assert_spin_locked(&wb->list_lock);
 	assert_spin_locked(&inode->i_lock);
+	WARN_ON_ONCE(inode->i_state & I_FREEING);
 
 	inode->i_state &= ~I_SYNC_QUEUED;
 	if (wb != &wb->bdi->wb)
@@ -1129,6 +1131,7 @@ static void inode_cgwb_move_to_attached(struct inode *inode,
 {
 	assert_spin_locked(&wb->list_lock);
 	assert_spin_locked(&inode->i_lock);
+	WARN_ON_ONCE(inode->i_state & I_FREEING);
 
 	inode->i_state &= ~I_SYNC_QUEUED;
 	list_del_init(&inode->i_io_list);
@@ -1294,6 +1297,17 @@ static void redirty_tail_locked(struct inode *inode, struct bdi_writeback *wb)
 {
 	assert_spin_locked(&inode->i_lock);
 
+	inode->i_state &= ~I_SYNC_QUEUED;
+	/*
+	 * When the inode is being freed just don't bother with dirty list
+	 * tracking. Flush worker will ignore this inode anyway and it will
+	 * trigger assertions in inode_io_list_move_locked().
+	 */
+	if (inode->i_state & I_FREEING) {
+		list_del_init(&inode->i_io_list);
+		wb_io_lists_depopulated(wb);
+		return;
+	}
 	if (!list_empty(&wb->b_dirty)) {
 		struct inode *tail;
 
@@ -1302,7 +1316,6 @@ static void redirty_tail_locked(struct inode *inode, struct bdi_writeback *wb)
 			inode->dirtied_when = jiffies;
 	}
 	inode_io_list_move_locked(inode, wb, &wb->b_dirty);
-	inode->i_state &= ~I_SYNC_QUEUED;
 }
 
 static void redirty_tail(struct inode *inode, struct bdi_writeback *wb)
@@ -1345,8 +1358,6 @@ static bool inode_dirtied_after(struct inode *inode, unsigned long t)
 	return ret;
 }
 
-#define EXPIRE_DIRTY_ATIME 0x0001
-
 /*
  * Move expired (dirtied before dirtied_before) dirty inodes from
  * @delaying_queue to @dispatch_queue.