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Btrfs: Fix block generation verification race

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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>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Yan, Zheng 2010-05-26 11:20:30 -04:00 committed by Chris Mason
parent 46bfbb5c07
commit 5bdd3536cb
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/ctree.c
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@ -1604,7 +1604,7 @@ read_block_for_search(struct btrfs_trans_handle *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,