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Btrfs: fix race between allocate and release extent buffer.

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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>
This commit is contained in:
Yan, Zheng 2010-02-04 08:46:56 +00:00 committed by Chris Mason
parent 035fe03a7a
commit f044ba7835
1 changed files with 1 additions and 2 deletions
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3
fs/btrfs/extent_io.c
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@ -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: