Re: [PATCH v2 2/2] btrfs/291: fix state transition logic and add size requirement

[Anand Jain <anajain.sg@gmail.com>]

On 27/4/26 20:25, Disha Goel wrote:
> This patch fixes two issues in btrfs/291:
> 
> 1. Add minimum 9GB LOGWRITES_DEV size requirement
>    The test creates LVM snapshots at each FUA point during replay,
>    requiring significant space. Use _require_log_writes_sized to
>    ensure sufficient space is available before running the test.
> 

It also depends on the SCRATCH_DEV size; the fix fails if SCRATCH_DEV is
 10G.

[  173.478493] BTRFS error (device dm-3): device total_bytes should be
at most 9663676416 but found 10737418240
[  173.482763] BTRFS error (device dm-3): failed to read chunk tree: -22
[  173.485457] BTRFS error (device dm-3): open_ctree failed: -22

Thanks.


> 2. Fix state transition logic for verity enablement
>    The original test assumed orphan items would always be created
>    during verity enablement (state 0->1 transition). However, in
>    some cases verity completes without creating orphan items,
>    causing the test to fail with "expected to reach verity done state".
> 
>    Fix by transitioning to state 1 when either orphan items exist
>    OR merkle items appear, handling both verity enablement paths.
>    Also improve state 1 validation to only check for cleared merkle
>    items when measurement actually fails.
> 
> The test now correctly handles verity enablement with or without
> orphan items while maintaining crash consistency validation.
> 
> v2:
> - Use _require_log_writes_sized instead of separate _require_log_writes
>   and _require_logwrites_size calls
> 
> Signed-off-by: Disha Goel <disgoel@linux.ibm.com>
> ---
>  tests/btrfs/291 | 17 ++++++++++++-----
>  1 file changed, 12 insertions(+), 5 deletions(-)
> 
> diff --git a/tests/btrfs/291 b/tests/btrfs/291
> index 122aeaa5..ac1d192d 100755
> --- a/tests/btrfs/291
> +++ b/tests/btrfs/291
> @@ -36,7 +36,7 @@ _cleanup()
>  _require_scratch
>  _require_test
>  _require_loop
> -_require_log_writes
> +_require_log_writes_sized $((9 * 1024 * 1024))
>  _require_dm_target snapshot
>  _require_command $LVM_PROG lvm
>  _require_scratch_verity
> @@ -129,9 +129,14 @@ do
>  	_udev_wait /dev/mapper/$vgname-$snapname
>  
>  	orphan=$(count_item $snap_dev ORPHAN)
> -	[ $state -eq 0 ] && [ $orphan -gt 0 ] && state=1
> -
>  	pre_mount=$(count_merkle_items $snap_dev)
> +
> +	if [ $state -eq 0 ]; then
> +		if [ $orphan -gt 0 ] || [ $pre_mount -gt 0 ]; then
> +			state=1
> +		fi
> +	fi
> +
>  	_mount $snap_dev $SCRATCH_MNT || _fail "mount failed at entry $cur"
>  	fsverity measure $SCRATCH_MNT/fsv >>$seqres.full 2>&1
>  	measured=$?
> @@ -143,8 +148,10 @@ do
>  	echo "entry: $cur, state: $state, orphan: $orphan, pre_mount: $pre_mount, post_mount: $post_mount" >> $seqres.full
>  
>  	if [ $state -eq 1 ]; then
> -		[ $post_mount -eq 0 ] || \
> -			_fail "mount failed to clear under-construction merkle items pre: $pre_mount, post: $post_mount at entry $cur";
> +		if [ $measured -ne 0 ]; then
> +			[ $post_mount -eq 0 ] || \
> +				_fail "mount failed to clear under-construction merkle items pre: $pre_mount, post: $post_mount at entry $cur";
> +		fi
>  	fi
>  	if [ $state -eq 2 ]; then
>  		[ $pre_mount -gt 0 ] || \