Re: btrfs-show vs. btrfs different output

[Eric Sandeen <sandeen@redhat.com>]

On 3/21/13 10:04 AM, Jon Nelson wrote:
> I'm running openSUSE 12.3 x86_64 which has an unknown git version, but
> reports v0.19.
> I'm also supplying the output from git which reports itself as:
> v0.20-rc1-253-g7854c8b
> 
> The problem is that btrfs-show (git) and btrfs fi show (git) give
> /different/ output from each other which is also different from the
> (older) btrfs.
> 
> First btrfs-show (git):
> 
> **
> ** WARNING: this program is considered deprecated
> ** Please consider to switch to the btrfs utility
> **
> Label: none  uuid: b5dc52bd-21bf-4173-8049-d54d88c82240
>         Total devices 2 FS bytes used 230.34GB
>         devid    1 size 298.09GB used 298.09GB path /dev/sda
>         *** Some devices missing
> 
> Label: none  uuid: 7feedf1e-9711-4900-af9c-92738ea8aace
>         Total devices 4 FS bytes used 348.21GB
>         devid    4 size 460.76GB used 444.23GB path /dev/sdb3
>         devid    3 size 460.76GB used 444.23GB path /dev/sda3
>         devid    6 size 298.09GB used 282.53GB path /dev/sdc
>         devid    5 size 298.09GB used 282.53GB path /dev/sdd
> 
> Btrfs v0.20-rc1-253-g7854c8b
> 
> 
> Now btrfs fi show (git):
> 
> failed to open /dev/sr0: No medium found
> Label: none  uuid: 7feedf1e-9711-4900-af9c-92738ea8aace
>         Total devices 4 FS bytes used 348.21GB
>         devid    5 size 298.09GB used 282.53GB path /dev/sdd
>         devid    6 size 298.09GB used 282.53GB path /dev/sdc
>         devid    4 size 460.76GB used 444.23GB path /dev/sdb3
>         devid    3 size 460.76GB used 444.23GB path /dev/sda3
> 
> Label: none  uuid: b5dc52bd-21bf-4173-8049-d54d88c82240
>         Total devices 2 FS bytes used 230.34GB
>         devid    1 size 298.09GB used 298.09GB path /dev/sdb
>         *** Some devices missing
> 
> Btrfs v0.20-rc1-253-g7854c8b
> 
> 
> And now the (older) btrfs fi show:
> 
> failed to read /dev/sr0
> Label: none  uuid: 7feedf1e-9711-4900-af9c-92738ea8aace
>         Total devices 4 FS bytes used 348.21GB
>         devid    5 size 298.09GB used 282.53GB path /dev/sdd
>         devid    6 size 298.09GB used 282.53GB path /dev/sdc
>         devid    4 size 460.76GB used 444.23GB path /dev/sdb3
>         devid    3 size 460.76GB used 444.23GB path /dev/sda3
> 
> Btrfs v0.19+
> 
> which has similar output to the (older) btrfs-show.
> 
> 
> The differences are:
> 
> 1. the order of devices varies (not a big deal)

Heh, that is annoying though.

> 2. the current git btrfs-show and btrfs fi show both output
> *different* devices for device with UUID
> b5dc52bd-21bf-4173-8049-d54d88c82240, and they're both wrong.

does blkid output find that uuid anywhere?

Since you're working in git, can you maybe do a little bisecting
to find out when it changed?  Should be a fairly quick test?

-Eric

> Somewhat confusingly, /dev/disk/by-uuid/ only shows three devices:
> 
> bd40cb4e-93bb-4600-8455-ca1185aa8abe -> ../../md3
> 7feedf1e-9711-4900-af9c-92738ea8aace -> ../../sda3
> 4f0b27a5-5f5b-413c-a71b-b5a3bec5482c -> ../../md2
> 
> What's going on with the varied output from (git) btrfs-show vs.
> 'btrfs fi show' (vs. the older, as-shipped btrfs)?
> 
>