btrfs device ready non-success exit code

btrfs device ready non-success exit code

[Roger Binns]

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This is on current Ubuntu 15.04.  What is device ready unhappy with?
Note that the root filesystem and /home (both subvolumes of this) are
mounted and working perfectly, and even where the commands are run from.

$ sudo btrfs fi show /dev/sda1
Label: 'main'  uuid: 3ff68715-0daa-4e44-8de2-0997f36d8ab6
	Total devices 2 FS bytes used 417.22GiB
	devid    2 size 894.25GiB used 362.03GiB path /dev/sdb1
	devid    3 size 894.25GiB used 362.03GiB path /dev/sda1

Btrfs v3.17
$ sudo btrfs fi show /
Label: 'main'  uuid: 3ff68715-0daa-4e44-8de2-0997f36d8ab6
	Total devices 2 FS bytes used 417.22GiB
	devid    2 size 894.25GiB used 362.03GiB path /dev/sdb1
	devid    3 size 894.25GiB used 362.03GiB path /dev/sda1

Btrfs v3.17
$ sudo btrfs device ready /dev/sda1 ; echo $?
1
$ sudo btrfs device ready /dev/sdb1 ; echo $?
1
$ uname -a
Linux workstation 3.19.0-18-generic #18-Ubuntu SMP Tue May 19 18:31:35
UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

Roger
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Re: btrfs device ready non-success exit code

[Anand Jain]

On 06/05/2015 01:57 AM, Roger Binns wrote:
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> Hash: SHA1
>
> This is on current Ubuntu 15.04.  What is device ready unhappy with?
> Note that the root filesystem and /home (both subvolumes of this) are
> mounted and working perfectly, and even where the commands are run from.
>
> $ sudo btrfs fi show /dev/sda1
> Label: 'main'  uuid: 3ff68715-0daa-4e44-8de2-0997f36d8ab6
> 	Total devices 2 FS bytes used 417.22GiB
> 	devid    2 size 894.25GiB used 362.03GiB path /dev/sdb1
> 	devid    3 size 894.25GiB used 362.03GiB path /dev/sda1
>
> Btrfs v3.17
> $ sudo btrfs fi show /
> Label: 'main'  uuid: 3ff68715-0daa-4e44-8de2-0997f36d8ab6
> 	Total devices 2 FS bytes used 417.22GiB
> 	devid    2 size 894.25GiB used 362.03GiB path /dev/sdb1
> 	devid    3 size 894.25GiB used 362.03GiB path /dev/sda1
>
> Btrfs v3.17
> $ sudo btrfs device ready /dev/sda1 ; echo $?
> 1
> $ sudo btrfs device ready /dev/sdb1 ; echo $?
> 1


typically ready cli is to check disk pool status in an unmounted state.

Strictly we wanted ready cli to be a read only cli, but it updates the 
device path as well, which eventually I think we will fix it, if the
systemd won't compliant about it.

-Anand


> $ uname -a
> Linux workstation 3.19.0-18-generic #18-Ubuntu SMP Tue May 19 18:31:35
> UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
>
> Roger
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> iEYEARECAAYFAlVwkX4ACgkQmOOfHg372QTEjQCgmhFU8Gxx8VOeNay2fkJjgpaU
> ZOEAn18pogQVQnS8AzPzSEY7gu6rH+q3
> =foM6
> -----END PGP SIGNATURE-----
>
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Re: btrfs device ready non-success exit code

[Roger Binns]

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On 06/04/2015 04:25 PM, Anand Jain wrote:
>> typically ready cli is to check disk pool status in an unmounted
>> state.

On my desktop with btrfs RAID0 on two partitions, the exit code of
ready is always 1.  On my laptop with btrfs RAID0 on two LUKS/dmcrypt
partitions the exit code is 0.  (In both cases there are / and /home
already mounted as subvolumes.)

The documentation says:

  Check device to see if it has all of it’s devices in
  cache for mounting

The semantics implied by that are that a successful return means you
can mount the device(s).  Consequently if already mounted, surely it
should return success?

Roger
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