On Tue, Nov 02, 2021 at 04:28:27PM +0100, Carlos Maiolino wrote:
> Once the kernel is free to not map the full swap file during a swapon call,
> it can be useful to know the exact size of the swap area created during
> _format_swapfile().
>
> To achieve this, it is required to change _require_scratch_swapfile(), to drop
> the _format_swapfile() return value, otherwise, it will also have a return value
> that will end up in tests outputs causing tests to fail.
>
> Tests using _format_swapfile() that do not require the swap file size do not
> need to be modified, as the return value will be simply ignored.
>
> Signed-off-by: Carlos Maiolino <cmaiolino@xxxxxxxxxx>
> ---
> common/rc | 10 +++++++---
> 1 file changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/common/rc b/common/rc
> index 7f693d39..fb1f32e0 100644
> --- a/common/rc
> +++ b/common/rc
> @@ -2587,6 +2587,7 @@ _require_odirect()
> _format_swapfile() {
> local fname="$1"
> local sz="$2"
> + local swap_log=""
>
> rm -f "$fname"
> touch "$fname"
> @@ -2595,8 +2596,11 @@ _format_swapfile() {
> $CHATTR_PROG +C "$fname" > /dev/null 2>&1
> _pwrite_byte 0x61 0 "$sz" "$fname" >> $seqres.full
> # Ignore permission complaints on filesystems that don't support perms
> - $MKSWAP_PROG "$fname" 2>&1 >> $seqres.full | \
> - grep -v "insecure permission"
> + swap_log=$($MKSWAP_PROG "$fname" 2>&1 | grep -v "insecure permission")
> + echo $swap_log >> $seqres.full
> +
> + # return created swap size
> + echo $swap_log | grep -oP '(?<=size = )\w+'
It's now returning the size of the swap space, it'd be better to add
some comments before the helper to describe/explain the behavior.
Thanks,
Eryu
> }
>
> _swapon_file() {
> @@ -2628,7 +2632,7 @@ _require_scratch_swapfile()
> _scratch_mount
>
> # Minimum size for mkswap is 10 pages
> - _format_swapfile "$SCRATCH_MNT/swap" $(($(get_page_size) * 10))
> + _format_swapfile "$SCRATCH_MNT/swap" $(($(get_page_size) * 10)) > /dev/null
>
> # ext* has supported all variants of swap files since their
> # introduction, so swapon should not fail.
> --
> 2.31.1
