After the path is released, the generation number got from block
pointer is no long valid. The race may cause disk corruption, because
verify_parent_transid() calls clear_extent_buffer_uptodate() when
generation numbers mismatch.
Signed-off-by: Yan Zheng <zheng.yan@xxxxxxxxxx>
---
diff -urp 1/fs/btrfs/ctree.c 2/fs/btrfs/ctree.c
--- 1/fs/btrfs/ctree.c 2010-04-14 14:49:56.342950744 +0800
+++ 2/fs/btrfs/ctree.c 2010-05-03 09:44:24.426642447 +0800
@@ -1589,7 +1589,7 @@ read_block_for_search(struct btrfs_trans
btrfs_release_path(NULL, p);
ret = -EAGAIN;
- tmp = read_tree_block(root, blocknr, blocksize, gen);
+ tmp = read_tree_block(root, blocknr, blocksize, 0);
if (tmp) {
/*
* If the read above didn't mark this buffer up to date,
--
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