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| author |   Miao Xie <miaox@cn.fujitsu.com> | 2011-11-10 20:45:05 -0500 |
|---|---|---|
| committer |   Chris Mason <chris.mason@oracle.com> | 2011-11-10 20:45:05 -0500 |
| commit | 76b9e23d25d5c99f994bee3172de39492e452e93 (patch) | |
| tree | 458af244546eb4a131944d2b3a922f027ea15d54 /fs | |
| parent | Btrfs: Abstract similar code for btrfs_block_rsv_add{, _noflush} (diff) | |
| download | linux-dev-76b9e23d25d5c99f994bee3172de39492e452e93.tar.xz linux-dev-76b9e23d25d5c99f994bee3172de39492e452e93.zip | |
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')
| -rw-r--r-- | fs/btrfs/relocation.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c index 24d654ce7a06..dff29d5e151a 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, |