btrfs fi du -s gives Inappropriate ioctl for device

[Piotr Szymaniak <szarpaj@grubelek.pl>]

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Hi list,

I have some weird issue.

So, I have btrfs fs and some subvols, like that:
~ # btrfs sub list /mnt/red/
ID 260 gen 827956 top level 5 path @home
ID 261 gen 827926 top level 5 path @backup
ID 645 gen 827911 top level 5 path @svn
*snip*

and some snapshots on those subvols:
*snip*
ID 2501 gen 827894 top level 260 path @home/.snapshot/monthly_2017-05-01_05:30:01
ID 2603 gen 827894 top level 260 path @home/.snapshot/monthly_2017-06-01_05:30:01
ID 2604 gen 827927 top level 261 path @backup/.snapshot/monthly_2017-06-01_05:30:02
ID 2680 gen 827895 top level 260 path @home/.snapshot/monthly_2017-07-01_05:30:01
ID 2681 gen 827927 top level 261 path @backup/.snapshot/monthly_2017-07-01_05:30:01
ID 2734 gen 827895 top level 260 path @home/.snapshot/weekly_2017-07-22_04:20:01
ID 2735 gen 827905 top level 645 path @svn/.snapshot/weekly_2017-07-22_04:20:02
ID 2754 gen 827895 top level 260 path @home/.snapshot/weekly_2017-07-29_04:20:01
ID 2755 gen 827906 top level 645 path @svn/.snapshot/weekly_2017-07-29_04:20:01
ID 2763 gen 827896 top level 260 path @home/.snapshot/monthly_2017-08-01_05:30:01
*snip*

and... some issues:
~ # btrfs fi du -s /mnt/red/\@backup/
     Total   Exclusive  Set shared  Filename
ERROR: cannot check space of '/mnt/red/@backup/': Inappropriate ioctl for device

and it works for other subvols:
~ # btrfs fi du -s /mnt/red/\@svn/
     Total   Exclusive  Set shared  Filename
  52.22GiB    10.59MiB     4.13GiB  /mnt/red/@svn/

~ # btrfs fi du -s /mnt/red/\@home/
     Total   Exclusive  Set shared  Filename
   2.08TiB     4.54GiB   124.51GiB  /mnt/red/@home/

on the other hand, those values also look wrong (2.08TiB?):
~ # btrfs fi df /mnt/red/\@home/
Data, RAID1: total=448.00GiB, used=447.39GiB
System, RAID1: total=32.00MiB, used=80.00KiB
Metadata, RAID1: total=3.00GiB, used=2.02GiB
GlobalReserve, single: total=512.00MiB, used=0.00B

~ # btrfs fi usage /mnt/red/\@home/
Overall:
    Device size:                   1.36TiB
    Device allocated:            902.06GiB
    Device unallocated:          493.21GiB
    Device missing:                  0.00B
    Used:                        898.81GiB
    Free (estimated):            247.22GiB      (min: 247.22GiB)
    Data ratio:                       2.00
    Metadata ratio:                   2.00
    Global reserve:              512.00MiB      (used: 0.00B)

Data,RAID1: Size:448.00GiB, Used:447.39GiB
   /dev/mapper/wd0       448.00GiB
   /dev/mapper/wd1       448.00GiB

Metadata,RAID1: Size:3.00GiB, Used:2.02GiB
   /dev/mapper/wd0         3.00GiB
   /dev/mapper/wd1         3.00GiB

System,RAID1: Size:32.00MiB, Used:80.00KiB
   /dev/mapper/wd0        32.00MiB
   /dev/mapper/wd1        32.00MiB

Unallocated:
   /dev/mapper/wd0       246.60GiB
   /dev/mapper/wd1       246.60GiB

~ # uname -sr
Linux 4.4.76

~ # btrfs --version
btrfs-progs v4.12

Whats wrong with one of my subvols? Whats wrong with space reported by fi du?


Best regards,
Piotr Szymaniak.

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