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@oracle.com> --- 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, -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html