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authorMiao Xie <miaox@cn.fujitsu.com>2011-11-10 20:45:05 -0500
committerChris Mason <chris.mason@oracle.com>2011-11-10 20:45:05 -0500
commit76b9e23d25d5c99f994bee3172de39492e452e93 (patch)
tree458af244546eb4a131944d2b3a922f027ea15d54 /fs/btrfs/relocation.c
parent61b520a9d0083b9b361638e456af45fd75150c87 (diff)
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>
Diffstat (limited to 'fs/btrfs/relocation.c')
-rw-r--r--fs/btrfs/relocation.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 24d654ce7a0..dff29d5e151 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -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,