Commit f044ba78 authored by Yan, Zheng's avatar Yan, Zheng Committed by Chris Mason
Browse files

Btrfs: fix race between allocate and release extent buffer. 



Increase extent buffer's reference count while holding the lock.
Otherwise it can race with try_release_extent_buffer.

Signed-off-by: default avatarYan Zheng <zheng.yan@oracle.com>
Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent 035fe03a

fs/btrfs/extent_io.c

+1 −2
Original line number Diff line number Diff line
@@ -3165,10 +3165,9 @@ struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree, 
		spin_unlock(&tree->buffer_lock);

		goto free_eb;

	}

	spin_unlock(&tree->buffer_lock);



	/* add one reference for the tree */

	atomic_inc(&eb->refs);

	spin_unlock(&tree->buffer_lock);

	return eb;



free_eb: