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Commit 5bdd3536 authored by Yan, Zheng's avatar Yan, Zheng Committed by Chris Mason
Browse files

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: default avatarYan Zheng <zheng.yan@oracle.com>
Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent 46bfbb5c

fs/btrfs/ctree.c

+1 −1
Original line number Diff line number Diff line
@@ -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,