Commit e9fbcb42 authored Jul 25, 2012 by Chris Mason

Btrfs: call the ordered free operation without any locks held



Each ordered operation has a free callback, and this was called with the
worker spinlock held.  Josef made the free callback also call iput,
which we can't do with the spinlock.

This drops the spinlock for the free operation and grabs it again before
moving through the rest of the list.  We'll circle back around to this
and find a cleaner way that doesn't bounce the lock around so much.

Signed-off-by: Chris Mason <chris.mason@fusionio.com>
cc: stable@kernel.org

parent 2b0ce2c2

fs/btrfs/async-thread.c

+8 −1

Original line number	Diff line number	Diff line
		@@ -206,10 +206,17 @@ static noinline void run_ordered_completions(struct btrfs_workers *workers,

		work->ordered_func(work);

		/* now take the lock again and call the freeing code */
		/* now take the lock again and drop our item from the list */
		spin_lock(&workers->order_lock);
		list_del(&work->order_list);
		spin_unlock(&workers->order_lock);

		/*
		* we don't want to call the ordered free functions
		* with the lock held though
		*/
		work->ordered_free(work);
		spin_lock(&workers->order_lock);
		}

		spin_unlock(&workers->order_lock);