On Wed, Mar 03, 2021 at 06:41:51PM +0800, Qu Wenruo wrote:
> There is a piece of weird code in insert_prealloc_file_extent(), which
> looks like:
>
> ret = btrfs_qgroup_release_data(inode, file_offset, len);
> if (ret < 0)
> return ERR_PTR(ret);
> if (trans) {
> ret = insert_reserved_file_extent(trans, inode,
> file_offset, &stack_fi,
> true, ret);
> ...
> }
> extent_info.is_new_extent = true;
> extent_info.qgroup_reserved = ret;
> ...
>
> Note how the variable @ret is abused here, and if anyone is adding code
> just after btrfs_qgroup_release_data() call, it's super easy to
> overwrite the @ret and cause tons of qgroup related bugs.
>
> Fix such abuse by introducing new variable @qgroup_released, so that we
> won't reuse the existing variable @ret.
>
> Signed-off-by: Qu Wenruo <[email protected]>
Added to misc-next, thanks.
