Commit f044ba78 authored Feb 04, 2010 by Yan, Zheng Committed by Chris Mason Feb 04, 2010

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: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris 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: