From: Filipe Manana fdmanana@suse.com
[ Upstream commit 91bfe3104b8db0310f76f2dcb6aacef24c889366 ]
If we fail to add a delayed dir index item because there's already another item with the same index number, we print an error message (and then BUG). However that message isn't very helpful to debug anything because we don't know what's the index number and what are the values of index counters in the inode and its delayed inode (index_cnt fields of struct btrfs_inode and struct btrfs_delayed_node).
So update the error message to include the index number and counters.
We actually had a recent case where this issue was hit by a syzbot report (see the link below).
Link: https://lore.kernel.org/linux-btrfs/00000000000036e1290603e097e0@google.com/ Reviewed-by: Qu Wenruo wqu@suse.com Signed-off-by: Filipe Manana fdmanana@suse.com Reviewed-by: David Sterba dsterba@suse.com Signed-off-by: David Sterba dsterba@suse.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/btrfs/delayed-inode.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/fs/btrfs/delayed-inode.c b/fs/btrfs/delayed-inode.c index cac5169eaf8de..221d34f2ddf9a 100644 --- a/fs/btrfs/delayed-inode.c +++ b/fs/btrfs/delayed-inode.c @@ -1493,9 +1493,10 @@ int btrfs_insert_delayed_dir_index(struct btrfs_trans_handle *trans, ret = __btrfs_add_delayed_item(delayed_node, delayed_item); if (unlikely(ret)) { btrfs_err(trans->fs_info, - "err add delayed dir index item(name: %.*s) into the insertion tree of the delayed node(root id: %llu, inode id: %llu, errno: %d)", - name_len, name, delayed_node->root->root_key.objectid, - delayed_node->inode_id, ret); +"error adding delayed dir index item, name: %.*s, index: %llu, root: %llu, dir: %llu, dir->index_cnt: %llu, delayed_node->index_cnt: %llu, error: %d", + name_len, name, index, btrfs_root_id(delayed_node->root), + delayed_node->inode_id, dir->index_cnt, + delayed_node->index_cnt, ret); BUG(); } mutex_unlock(&delayed_node->mutex);