Re: [PATCH V3] ovl: fix mount fail because the upper doesn't have space

From: Miklos Szeredi
Date: Tue Aug 01 2023 - 13:43:23 EST

On Thu, 20 Jul 2023 at 11:15, Yunlong Xing <yunlong.xing@xxxxxxxxxx> wrote:
> The current ovlfs mount flow:
> ovl_fill_super
> |_ovl_get_workdir
> |_ovl_make_workdir
> |_ovl_check_rename_whiteout
> In ovl_check_rename_whiteout(), a new file is attempted to create.But if
> the upper doesn't have space to do this, it will return error -ENOSPC,
> causing the mount fail. It means that if the upper is full, the overlayfs
> cannot be mounted. It is not reasonable, so this patch will omit this error
> and continue mount flow.

Wouldn't mounting without upper (two or more lower layers) work in this case?