2010/4/26 C Anthony Risinger <anth...@extof.me>:
> hello,
>
> i maintain an unofficial initrd hook in Arch Linux that allows BTRFS
> to be used as the root device. i am trying to update the hook to use
> the more extensive "btrfs" command, adding support for users to change
> their default subvolume from within the initrd (i'm creating a sort of
> 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).
>
> 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. i have also tried creating a snapshot
> and pointing the command at that, but i get the same results. am i
> using the command wrong? relevant code is from btrfs-list.c:
>
> ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
> if (ret < 0) {
> fprintf(stderr, "ERROR: can't perform the search\n");
> return 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? everything seems to be in order and working fine... any help
> appreciated.
>
> thanks,
> C Anthony
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