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Btrfs: fix orphan backref nodes 

If the root node of a fs/file tree is in the block group that is
being relocated, but the others are not in the other block groups.
when we create a snapshot for this tree between the relocation tree
creation ends and ->create_reloc_tree is set to 0, Btrfs will create
some backref nodes that are the lowest nodes of the backrefs cache.
But we forget to add them into ->leaves list of the backref cache
and deal with them, and at last, they will triggered BUG_ON().

  kernel BUG at fs/btrfs/relocation.c:239!

This patch fixes it by adding them into ->leaves list of backref cache.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
wifi-calibration
Miao Xie 2011-11-10 20:45:05 -05:00 committed by Chris Mason
parent 61b520a9d0
commit 76b9e23d25
1 changed files with 2 additions and 0 deletions
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fs/btrfs/relocation.c
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@ -1174,6 +1174,8 @@ static int clone_backref_node(struct btrfs_trans_handle *trans,
list_add_tail(&new_edge->list[UPPER],
&new_node->lower);
}
} else {
list_add_tail(&new_node->lower, &cache->leaves);
}
rb_node = tree_insert(&cache->rb_root, new_node->bytenr,