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authorYan, Zheng <zheng.yan@oracle.com>2010-05-26 11:20:30 -0400
committerChris Mason <chris.mason@oracle.com>2010-05-26 21:35:33 -0400
commit5bdd3536cbbe2ecd94ecc14410c6b1b31da16381 (patch)
tree7fd9cd2cb497f6150a5dfde4528ba6ba64144e40 /fs/btrfs
parent46bfbb5c0740c200d2b66afcbd1f9d64ab320940 (diff)
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>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/ctree.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index acd532af8e55..0d1d966b0fe4 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -1604,7 +1604,7 @@ read_block_for_search(struct btrfs_trans_handle *trans,
1604 btrfs_release_path(NULL, p); 1604 btrfs_release_path(NULL, p);
1605 1605
1606 ret = -EAGAIN; 1606 ret = -EAGAIN;
1607 tmp = read_tree_block(root, blocknr, blocksize, gen); 1607 tmp = read_tree_block(root, blocknr, blocksize, 0);
1608 if (tmp) { 1608 if (tmp) {
1609 /* 1609 /*
1610 * If the read above didn't mark this buffer up to date, 1610 * If the read above didn't mark this buffer up to date,