On Wed, Jun 22, 2016 at 06:32:19PM -0700, Liu Bo wrote:
> With btrfs-corrupt-block, one can set btree node/leaf's field, if
> we assign a negative value to node/leaf, we can get various hangs,
> eg. if extent_root's nritems is -2ULL, then we get stuck in
> btrfs_read_block_groups() because it has a while loop and
> btrfs_search_slot() on extent_root will always return the first
> child.
>
> This lets us know what's happening and returns a EINVAL to callers
> instead of returning the first item.
>
> Signed-off-by: Liu Bo <bo.li.liu@xxxxxxxxxx>
> ---
> fs/btrfs/ctree.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
> index c49a500..915d224 100644
> --- a/fs/btrfs/ctree.c
> +++ b/fs/btrfs/ctree.c
> @@ -1770,6 +1770,14 @@ static noinline int generic_bin_search(struct extent_buffer *eb,
> unsigned long map_len = 0;
> int err;
>
> + if (low > high) {
> + btrfs_err(eb->fs_info,
> + "%s: low (%d) < high (%d) eb %llu owner %llu level %d",
Why is it '<' in the error message?
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