btrfs filesystem show confused when label is same as mountpoint

btrfs filesystem show confused when label is same as mountpoint

[Sjoerd]

Hi,

I've a btrfs partition with label 'MULTIMEDIA' (all capitals) and mounted it 
on /data/Multimedia (only M capital) and see the following when doing a btrfs 
fi show:

for mountpoint:
btrfs fi show /data/Multimedia
Btrfs v3.17

versus for label:
btrfs fi show MULTIMEDIA
Label: 'MULTIMEDIA'  uuid: ce5d23cd-73a4-4f7c-83cd-2c40d12f6697
        Total devices 4 FS bytes used 5.04TiB
        devid    1 size 1.48TiB used 1.26TiB path /dev/sda2
        devid    2 size 1.48TiB used 1.26TiB path /dev/sdc2
        devid    3 size 1.48TiB used 1.26TiB path /dev/sdd2
        devid    4 size 1.48TiB used 1.26TiB path /dev/sde2


So in the latter case I get the results I was looking for.


It's not realy a question, but I couldn't find anything on the bugtracker (if 
it's a bug in the first place) or a known something, so just to let you 
know,cause I took me awhile to figure out why I didn't get results for this 
particular mountpoint, while for others I did ;)

Cheers,
Sjoerd

Re: btrfs filesystem show confused when label is same as mountpoint

[Anand Jain]

I don't see that in 4.0, could you upgrade/try. thanks

---------------
mount /dev/sdf /data/Multimedia

btrfs fi show /data/Multimedia
Label: 'MULTIMEDIA'  uuid: 9b49bcc9-66d9-4f76-a57a-a60e2a16f15d
	Total devices 1 FS bytes used 192.00KiB
	devid    1 size 2.90GiB used 333.12MiB path /dev/sdf

btrfs-progs v4.0.1-2-ge8ceb61

btrfs fi show MULTIMEDIA
Label: 'MULTIMEDIA'  uuid: 9b49bcc9-66d9-4f76-a57a-a60e2a16f15d
	Total devices 1 FS bytes used 192.00KiB
	devid    1 size 2.90GiB used 333.12MiB path /dev/sdf

btrfs-progs v4.0.1-2-ge8ceb61
---------------

Anand


On 06/13/2015 03:20 PM, Sjoerd wrote:> Hi,
 >
 > I've a btrfs partition with label 'MULTIMEDIA' (all capitals) and 
mounted it
 > on /data/Multimedia (only M capital) and see the following when doing 
a btrfs
 > fi show:
 >
 > for mountpoint:
 > btrfs fi show /data/Multimedia
 > Btrfs v3.17
 >
 > versus for label:
 > btrfs fi show MULTIMEDIA
 > Label: 'MULTIMEDIA'  uuid: ce5d23cd-73a4-4f7c-83cd-2c40d12f6697
 >          Total devices 4 FS bytes used 5.04TiB
 >          devid    1 size 1.48TiB used 1.26TiB path /dev/sda2
 >          devid    2 size 1.48TiB used 1.26TiB path /dev/sdc2
 >          devid    3 size 1.48TiB used 1.26TiB path /dev/sdd2
 >          devid    4 size 1.48TiB used 1.26TiB path /dev/sde2
 >
 >
 > So in the latter case I get the results I was looking for.
 >
 >
 > It's not realy a question, but I couldn't find anything on the 
bugtracker (if
 > it's a bug in the first place) or a known something, so just to let you
 > know,cause I took me awhile to figure out why I didn't get results 
for this
 > particular mountpoint, while for others I did ;)
 >
 > Cheers,
 > Sjoerd
 >
 > --
 > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
 > the body of a message to majordomo@vger.kernel.org
 > More majordomo info at  http://vger.kernel.org/majordomo-info.html
 >

Re: btrfs filesystem show confused when label is same as mountpoint

[Duncan]

Sjoerd posted on Sat, 13 Jun 2015 09:20:12 +0200 as excerpted:

> versus for label:
> btrfs fi show MULTIMEDIA
> Label: 'MULTIMEDIA'  uuid: ce5d23cd-73a4-4f7c-83cd-2c40d12f6697

Hmm... I wasn't even aware that you could /use/ label!  But sure enough, 
it works here, too:

btrfs fi show rt0238gcnx+35l0
Label: 'rt0238gcnx+35l0'  uuid: 8f8d79ef-a86f-4306-a255-e0519e0f6132
        Total devices 2 FS bytes used 1.94GiB
        devid    1 size 8.00GiB used 3.78GiB path /dev/sda5
        devid    2 size 8.00GiB used 3.78GiB path /dev/sdb5

btrfs-progs v4.0.1


It works for UUID as well...

btrfs fi show 8f8d79ef-a86f-4306-a255-e0519e0f6132
Label: 'rt0238gcnx+35l0'  uuid: 8f8d79ef-a86f-4306-a255-e0519e0f6132
        Total devices 2 FS bytes used 1.94GiB
        devid    1 size 8.00GiB used 3.78GiB path /dev/sda5
        devid    2 size 8.00GiB used 3.78GiB path /dev/sdb5

btrfs-progs v4.0.1

... but that's a lot of arbitrary typing.

Doesn't work with partlabel or id (see /dev/disk/by-*), however. =:^(

Anyway, thanks!  Learned something new about btrfs fi show, today! =:^)

-- 
Duncan - List replies preferred.   No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master."  Richard Stallman

Re: btrfs filesystem show confused when label is same as mountpoint

[Sjoerd]

On Saturday 13 June 2015 17:50:05 Anand Jain wrote:
> I don't see that in 4.0, could you upgrade/try. thanks
> 

That works fine indeed! Thanks....Could have thought to try that first myself ;)


> ---------------
> mount /dev/sdf /data/Multimedia
> 
> btrfs fi show /data/Multimedia
> Label: 'MULTIMEDIA'  uuid: 9b49bcc9-66d9-4f76-a57a-a60e2a16f15d
> 	Total devices 1 FS bytes used 192.00KiB
> 	devid    1 size 2.90GiB used 333.12MiB path /dev/sdf
> 
> btrfs-progs v4.0.1-2-ge8ceb61
> 
> btrfs fi show MULTIMEDIA
> Label: 'MULTIMEDIA'  uuid: 9b49bcc9-66d9-4f76-a57a-a60e2a16f15d
> 	Total devices 1 FS bytes used 192.00KiB
> 	devid    1 size 2.90GiB used 333.12MiB path /dev/sdf
> 
> btrfs-progs v4.0.1-2-ge8ceb61
> ---------------
> 
> Anand
> 
> 
> On 06/13/2015 03:20 PM, Sjoerd wrote:> Hi,
> 
>  > I've a btrfs partition with label 'MULTIMEDIA' (all capitals) and
> 
> mounted it
> 
>  > on /data/Multimedia (only M capital) and see the following when doing
> 
> a btrfs
> 
>  > fi show:
>  > 
>  > for mountpoint:
>  > btrfs fi show /data/Multimedia
>  > Btrfs v3.17
>  > 
>  > versus for label:
>  > btrfs fi show MULTIMEDIA
>  > Label: 'MULTIMEDIA'  uuid: ce5d23cd-73a4-4f7c-83cd-2c40d12f6697
>  > 
>  >          Total devices 4 FS bytes used 5.04TiB
>  >          devid    1 size 1.48TiB used 1.26TiB path /dev/sda2
>  >          devid    2 size 1.48TiB used 1.26TiB path /dev/sdc2
>  >          devid    3 size 1.48TiB used 1.26TiB path /dev/sdd2
>  >          devid    4 size 1.48TiB used 1.26TiB path /dev/sde2
>  > 
>  > So in the latter case I get the results I was looking for.
>  > 
>  > 
>  > It's not realy a question, but I couldn't find anything on the
> 
> bugtracker (if
> 
>  > it's a bug in the first place) or a known something, so just to let you
>  > know,cause I took me awhile to figure out why I didn't get results
> 
> for this
> 
>  > particular mountpoint, while for others I did ;)
>  > 
>  > Cheers,
>  > Sjoerd
>  > 
>  > --
>  > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
>  > the body of a message to majordomo@vger.kernel.org
>  > More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: btrfs filesystem show confused when label is same as mountpoint

[David Sterba]

On Sat, Jun 13, 2015 at 09:51:41AM +0000, Duncan wrote:
> Sjoerd posted on Sat, 13 Jun 2015 09:20:12 +0200 as excerpted:
> 
> > versus for label:
> > btrfs fi show MULTIMEDIA
> > Label: 'MULTIMEDIA'  uuid: ce5d23cd-73a4-4f7c-83cd-2c40d12f6697
> 
> Hmm... I wasn't even aware that you could /use/ label!  But sure enough, 
> it works here, too:
> 
> btrfs fi show rt0238gcnx+35l0
> Label: 'rt0238gcnx+35l0'  uuid: 8f8d79ef-a86f-4306-a255-e0519e0f6132
>         Total devices 2 FS bytes used 1.94GiB
>         devid    1 size 8.00GiB used 3.78GiB path /dev/sda5
>         devid    2 size 8.00GiB used 3.78GiB path /dev/sdb5
> 
> btrfs-progs v4.0.1
> 
> 
> It works for UUID as well...
> 
> btrfs fi show 8f8d79ef-a86f-4306-a255-e0519e0f6132
> Label: 'rt0238gcnx+35l0'  uuid: 8f8d79ef-a86f-4306-a255-e0519e0f6132
>         Total devices 2 FS bytes used 1.94GiB
>         devid    1 size 8.00GiB used 3.78GiB path /dev/sda5
>         devid    2 size 8.00GiB used 3.78GiB path /dev/sdb5
> 
> btrfs-progs v4.0.1
> 
> ... but that's a lot of arbitrary typing.
> 
> Doesn't work with partlabel or id (see /dev/disk/by-*), however. =:^(

The commandline tries to guess if it's label/uuid/path. If we want to
add support for partlabel and/or partuuid, we can't use the bare string,
but possibly the blkid tags, like

 $ btrfs fi show PARTUUID="8f8d79ef-a86f-4306-a255-e0519e0f6132"