Re: btrfs-progs: btrfs dev usa as non-root is wrong and should just abort

[Russell Coker <russell@coker.com.au>]

On Thursday, 11 July 2024 13:47:59 AEST Qu Wenruo wrote:
> > # btrfs dev usa -b /
> > /dev/mapper/root, ID: 1
> > 
> >     Device size:          511493395968
> 
> The device size is 4K aligned.
> 
> I guess it's some older fs? As newer mkfs would always round down to the
> sector size.

My recollection is that I had run mkfs on a system running Debian/Bookworm 
which had different hardware and then used dd to copy it to this one.

> >     Device slack:               1536
> >     Data,single:          231936622592
> >     Metadata,DUP:         6442450944
> >     System,DUP:             67108864
> >     Unallocated:          273047212032
> > 
> > $ btrfs dev usa -b /
> > WARNING: cannot read detailed chunk info, per-device usage will not be
> > shown, run as root
> > /dev/mapper/root, ID: 1
> > 
> >     Device size:           999010539
> >     Device slack:         18446743563215167723
> >     Unallocated:          511493394432
> >> 
> >> And what's the version of the btrfs-progs?
> > 
> > The Debian package version is 6.6.3-1.2+b1.
> 
> It may be easier to debug by trying a newer version of btrfs-progs.
> 
> And since I'm not sure if it's the unalignment causing problems, you may
> want to resize the fs by:
> 
> # btrfs device resize -1M <mnt>
> 
> Then resize to max (which should always align the fs correctly):
> 
> # btrfs device resize max <mnt>

root@cupcakke:/tmp# btrfs fi resize 1:-1M  /
Resize device id 1 (/dev/mapper/root) from 476.37GiB to 476.36GiB
root@cupcakke:/tmp# btrfs fi resize 1:max  /
Resize device id 1 (/dev/mapper/root) from 476.36GiB to max

etbe@cupcakke:/tmp$ btrfs dev usa -b /
WARNING: cannot read detailed chunk info, per-device usage will not be shown, 
run as root
/dev/mapper/root, ID: 1
   Device size:           999010539
   Device slack:         18446743563215167723
   Unallocated:          511493394432

etbe@cupcakke:/tmp$ btrfs dev usa /
WARNING: cannot read detailed chunk info, per-device usage will not be shown, 
run as root
/dev/mapper/root, ID: 1
   Device size:           952.73MiB
   Device slack:           16.00EiB
   Unallocated:           476.37GiB

That doesn't seem to have changed anything.

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