Re: list subvolumes with new btrfs command

[sniper <s3c24xx@gmail.com>]

2010/4/26 C Anthony Risinger <anthony@extof.me>:
> hello,
>
> i maintain an unofficial initrd hook in Arch Linux that allows BTRFS
> to be used as the root device. =C2=A0i am trying to update the hook t=
o use
> the more extensive "btrfs" command, adding support for users to chang=
e
> their default subvolume from within the initrd (i'm creating a sort o=
f
> rollback feature, in conjunction with automatic snapshotting via the
> package manager), and adding support for hot spares (via a second
> BTRFS pool in which devices are "stolen" to repair the primary array)=
=2E
>
> anyways, i'm having trouble getting a listing of subvolumes:
>
> $ btrfs subvolume list /
> ERROR: can't perform the search
>
> the machine has a BTRFS root. =C2=A0i have also tried creating a snap=
shot
> and pointing the command at that, but i get the same results. =C2=A0a=
m i
> using the command wrong? =C2=A0relevant code is from btrfs-list.c:
>
> ret =3D ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
> if (ret < 0) {
> =C2=A0fprintf(stderr, "ERROR: can't perform the search\n");
> =C2=A0return 0;
> }
>
need super root? in my ubuntu10.04 with latest btrfs-progs:

$ ./btrfs subvolume list /media/sda3-100g/
ERROR: can't perform the search
$ sudo ./btrfs subvolume list /media/sda3-100g/
ID 258 top level 5 path misc/snap/snap-4-26

> kernel:
>
> $ uname -r
> 2.6.33-ARCH
>
> is there a new CONFIG_* kernel parameter that needs to be set since
> 2.6.32? =C2=A0everything seems to be in order and working fine... any=
 help
> appreciated.
>
> thanks,
> C Anthony
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