Btrfs: Fix block generation verification race
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>
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index acd532a..0d1d966 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -1604,7 +1604,7 @@
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,