Re: [PATCH] btrfs/104: remove ugly sleep

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On Fri, Apr 15, 2016 at 12:04 AM, Mark Fasheh <mfasheh@xxxxxxx> wrote:
> Latest btrfsprogs can now do 'subvolume sync' to wait on snapshots to be
> dropped. Replace the sleep call in btrfs/104 with this. We can also add this
> test to the 'quick' group now.
>
> Signed-off-by: Mark Fasheh <mfasheh@xxxxxxx>
> ---
>  tests/btrfs/104   | 8 +++-----
>  tests/btrfs/group | 2 +-
>  2 files changed, 4 insertions(+), 6 deletions(-)
>
> diff --git a/tests/btrfs/104 b/tests/btrfs/104
> index 6afaa02..627e77b 100755
> --- a/tests/btrfs/104
> +++ b/tests/btrfs/104
> @@ -145,11 +145,9 @@ _scratch_cycle_mount
>  # referenced above.
>  _run_btrfs_util_prog subvolume delete $SCRATCH_MNT/snap1
>
> -# There is no way from userspace to force btrfs_drop_snapshot to run
> -# at a given time (even via mount/unmount). We must wait for it to
> -# start and complete. This is the shortest time on my tests systems I
> -# have found which always allows drop_snapshot to run to completion.
> -sleep 45
> +# Removing snapshots on btrfs is a delayed operation, so we must wait for
> +# btrfs_drop_snapshot to complete.
> +_run_btrfs_util_prog subvolume sync $SCRATCH_MNT

Looks good, except that this will cause a test failure when running
with older versions of btrfs-progs that don't have this command.

We should skip the test with such old versions (it's usually what we
do everywhere) or make it fallback to the sleep.
We have "_require_btrfs <command>" to check if btrfs-progs supports a
specific command, so we could extend it to check for a subcommand too
as an optional argument so we could call
"_require_btrfs subvolume sync" in the test.

>
>  _scratch_unmount
>
> diff --git a/tests/btrfs/group b/tests/btrfs/group
> index ef6c260..9403daa 100644
> --- a/tests/btrfs/group
> +++ b/tests/btrfs/group
> @@ -104,7 +104,7 @@
>  101 auto quick replace
>  102 auto quick metadata enospc
>  103 auto quick clone compress
> -104 auto qgroup
> +104 auto quick qgroup
>  105 auto quick send
>  106 auto quick clone compress
>  107 auto quick prealloc
> --
> 2.1.4
>
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 Unreasonable men adapt the world to themselves.
 That's why all progress depends on unreasonable men."
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