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Date: Mon, 28 Aug 2017 17:18:55 +0500
From: Roman Mamedov <rm@romanrm.net>
To: Nikolay Borisov <n.borisov.lkml@gmail.com>
Cc: Christoph Anton Mitterer <calestyo@scientia.net>,
        "Janos Toth F." <toth.f.janos@gmail.com>,
        Btrfs BTRFS <linux-btrfs@vger.kernel.org>
Subject: Re: deleted subvols don't go away?
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On Mon, 28 Aug 2017 15:03:47 +0300
Nikolay Borisov <n.borisov.lkml@gmail.com> wrote:

> when the cleaner thread runs again the snapshot's root item is going to
> be deleted for good and you no longer will see it.

Oh, that's pretty sweet -- it means there's actually a way to reliably wait
for cleaner work to be done on all deleted snapshots before unmounting the FS.
I was wondering about that recently for some transient filesystems (which get
mounted, synced to, snapshot-created/removed, then unmounted). Now can just
loop with a few second sleeps until `btrfs sub list -d $PATH` comes up empty.

-- 
With respect,
Roman