Missing UUID on BTRFS partition in some applications

* Missing UUID on BTRFS partition in some applications
@ 2022-06-15 12:59 Jason Beazell
  2022-06-15 15:19 ` Andrei Borzenkov
  0 siblings, 1 reply; 2+ messages in thread
From: Jason Beazell @ 2022-06-15 12:59 UTC (permalink / raw)
  To: linux-btrfs

I have an odd one that I haven't been able to find a good resolution
for.  I have a partition that suddenly lost its UUID, but seems to be
fine otherwise.  I can mount it by device, and btrfs check (cannot run
now as the partition is mounted doing a snapraid sync) and scrub
report no errors:
~# btrfs scrub status /srv/Data3/
UUID:             1846f412-a17d-4e2e-b389-59fd9c7590c0
Scrub started:    Sat Jun  4 13:24:32 2022
Status:           finished
Duration:         5:43:21
Total to scrub:   2.76TiB
Rate:             183.27MiB/s
Error summary:    no errors found

Those both display the UUID, but lsblk -f does not and I cannot mount
the partition by UUID:
~# lsblk -f
NAME   FSTYPE FSVER LABEL   UUID
FSAVAIL FSUSE% MOUNTPOINT
sda
└─sda1 btrfs        Data4   7a726017-4d75-40db-a90c-485f61209c56
2.7T    51% /srv/Data4
sdb
└─sdb1 btrfs        Parity2 207ea593-b347-453a-bc5d-fce2a9d4c609
1.5T    73% /srv/Parity1
sdc
└─sdc1
2.7T    51% /srv/Data3
sdd
└─sdd1 btrfs        Data1   73c4599d-9d6d-4e4e-9453-cfb128523136
3.9T    28% /srv/Data1
sde
├─sde1 ext4   1.0           ff42a1af-db20-434f-b141-2ef2cb170e8c
36.5G    27% /home
├─sde2
└─sde5 swap   1             4c37f7d9-7011-430d-8988-a5c003950261
         [SWAP]
sdf
└─sdf1 btrfs        Data2   521987a6-f68e-4eab-ada0-9a3f265a1f89
1.4T    60% /srv/Data2
sdh
└─sdh1 btrfs        Store   2d9182c0-db86-4d8e-b727-abc594c8f624
1.2T    66% /srv/store
sdi
└─sdi1 ext4   1.0           ebd917ef-9f7d-45bd-b42d-31a0343d930b
101.4G     8% /

Now that I look at that, I also note that the Label (Data3) is
missing. Snapraid complains that the UUID is unsupported when doing a
sync: "WARNING! UUID is unsupported for disks: 'Data3'. Not using
inodes to detect move operations."

any thoughts??

thanks!

# uname -a
Linux Moirai 5.10.0-14-amd64 #1 SMP Debian 5.10.113-1 (2022-04-29)
x86_64 GNU/Linux
~# btrfs --version
btrfs-progs v5.10.1
~# btrfs fi show
Label: 'Data2'  uuid: 521987a6-f68e-4eab-ada0-9a3f265a1f89
        Total devices 1 FS bytes used 2.19TiB
        devid    1 size 3.64TiB used 2.93TiB path /dev/sdf1

Label: 'Data1'  uuid: 73c4599d-9d6d-4e4e-9453-cfb128523136
        Total devices 1 FS bytes used 1.52TiB
        devid    1 size 5.46TiB used 1.66TiB path /dev/sdd1

Label: 'Data3'  uuid: 1846f412-a17d-4e2e-b389-59fd9c7590c0
        Total devices 1 FS bytes used 2.76TiB
        devid    1 size 5.46TiB used 2.92TiB path /dev/sdc1

Label: 'Data4'  uuid: 7a726017-4d75-40db-a90c-485f61209c56
        Total devices 1 FS bytes used 2.78TiB
        devid    1 size 5.46TiB used 3.23TiB path /dev/sda1

Label: 'Store'  uuid: 2d9182c0-db86-4d8e-b727-abc594c8f624
        Total devices 1 FS bytes used 2.38TiB
        devid    1 size 3.64TiB used 2.77TiB path /dev/sdh1

Label: 'Parity2'  uuid: 207ea593-b347-453a-bc5d-fce2a9d4c609
        Total devices 1 FS bytes used 3.96TiB
        devid    1 size 5.46TiB used 3.96TiB path /dev/sdb1

~# btrfs fi df /srv/Data3/
Data, single: total=2.91TiB, used=2.75TiB
System, DUP: total=8.00MiB, used=352.00KiB
Metadata, DUP: total=7.00GiB, used=4.76GiB
GlobalReserve, single: total=512.00MiB, used=0.00B

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