From: David Sterba <dsterba@suse.cz>
To: Marc MERLIN <marc@merlins.org>
Cc: Martin Steigerwald <martin@lichtvoll.de>,
Josef Bacik <josef@toxicpanda.com>,
linux-btrfs@vger.kernel.org, kernel-team@fb.com
Subject: Re: [PATCH] btrfs: do not zero f_bavail if we have available space
Date: Wed, 19 Feb 2020 15:31:14 +0100 [thread overview]
Message-ID: <20200219143114.GY2902@suse.cz> (raw)
In-Reply-To: <20200219134327.GD30993@merlins.org>
On Wed, Feb 19, 2020 at 05:43:27AM -0800, Marc MERLIN wrote:
> On Wed, Feb 19, 2020 at 10:17:24AM +0100, Martin Steigerwald wrote:
> > Marc MERLIN - 19.02.20, 01:42:57 CET:
> > > Has the patch gotten to any 5.5 release too?
> >
> > Yes, as git log easily reveals.
>
> Sorry if I suck, but right now I only have pre-made kernel releases from
> kernel.org.
> This bug in 5.4 messed up some of my dm-thin volumes which now took 28% of a dm-thin
> 14TB pool when the actual data is only using 4GB :( (at the same time it
> also shows my FS is full when of course it's not).
>
> I'll likely have to destroy the dm-thin to recover that space (or maybe
> not, we'll see), but I'm travelling and don't really have countless time
> to allocate to this.
> If 5.5.4 is supposed to fix this too, I'll build it, install it and hope
> it reclaims my lost dm-thin space, and if not suck up the deletion,
> re-creation and backup/restore.
The fix got to stable 5.5.2 and 5.4.18. I don't know if dm-thin actually
allows that, but is there a non-destructive way to reclaim the space?
Like using fstrim (the filesystem can tell the underlying storage which
blocks are free). According to
http://man7.org/linux/man-pages/man7/lvmthin.7.html ("Manually manage
free data space of thin pool LV") this should work but I have no
practical experience with that.
next prev parent reply other threads:[~2020-02-19 14:31 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-31 14:31 [PATCH] btrfs: do not zero f_bavail if we have available space Josef Bacik
2020-01-31 20:06 ` Martin Steigerwald
2020-02-01 1:00 ` Qu Wenruo
2020-02-02 17:52 ` David Sterba
[not found] ` <CAKhhfD7S=kcKLRURdNFZ8H4beS8=XjFvnOQXche7+SVOGFGC_w@mail.gmail.com>
2020-02-19 9:17 ` Martin Steigerwald
2020-02-19 13:43 ` Marc MERLIN
2020-02-19 14:31 ` David Sterba [this message]
2020-02-19 15:36 ` Marc MERLIN
2020-02-19 17:50 ` Roman Mamedov
2020-02-19 22:21 ` Martin Steigerwald
2020-02-20 21:46 ` Marc MERLIN
2020-02-21 5:38 ` Marc MERLIN
2020-02-21 5:45 ` Roman Mamedov
2020-02-21 23:07 ` btrfs filled up dm-thin and df%: shows 8.4TB of data used when I'm only using 10% of that Marc MERLIN
2020-02-21 23:17 ` How to roll back btrfs filesystem a few revisions? Marc MERLIN
2020-02-21 23:47 ` Josef Bacik
2020-02-22 0:08 ` Marc MERLIN
2020-02-22 0:36 ` Josef Bacik
2020-02-21 23:43 ` btrfs filled up dm-thin and df%: shows 8.4TB of data used when I'm only using 10% of that Josef Bacik
2020-02-22 0:01 ` Marc MERLIN
2020-02-22 0:43 ` Josef Bacik
2020-02-22 1:06 ` Marc MERLIN
2020-02-22 1:23 ` Marc MERLIN
2020-02-22 14:51 ` Marc MERLIN
2020-02-22 14:52 ` Josef Bacik
2020-02-22 15:24 ` Marc MERLIN
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