Here's what I'm getting on ubuntu-10.04 with standard tools,
(/sbin/btrfsctl), and freshly built tools, (/usr/local/bin/btrfsctl).
Are we sure that the btrfs kernel module in this release is supporting
the right ioctls?
--rich
rich@diamonds> pwd
/home/rich
rich@diamonds> mount | grep /home
/dev/sda7 on /home type btrfs (rw,noatime)
rich@diamonds> /sbin/btrfsctl -s snaptest /home
operation complete
Btrfs Btrfs v0.19
rich@diamonds> ls -lasd snaptest
4 drwxr-xr-x 1 root root 52 2010-06-21 16:13 snaptest
rich@diamonds> /sbin/btrfsctl
no valid commands given
usage: btrfsctl [ -d file|dir] [ -s snap_name subvol|tree ]
[-r size] [-A device] [-a] [-c]
-d filename: defragments one file
-d directory: defragments the entire Btree
-s snap_name dir: creates a new snapshot of dir
-S subvol_name dir: creates a new subvolume
-r [+-]size[gkm]: resize the FS by size amount
-A device: scans the device file for a Btrfs filesystem
-a: scans all devices for Btrfs filesystems
-c: forces a single FS sync
Btrfs Btrfs v0.19
rich@diamonds> /usr/local/bin/btrfsctl
no valid commands given
usage: btrfsctl [ -d file|dir] [ -s snap_name subvol|tree ]
[-r size] [-A device] [-a] [-c] [-D dir .]
-d filename: defragments one file
-d directory: defragments the entire Btree
-s snap_name dir: creates a new snapshot of dir
-S subvol_name dir: creates a new subvolume
-r [+-]size[gkm]: resize the FS by size amount
-A device: scans the device file for a Btrfs filesystem
-a: scans all devices for Btrfs filesystems
-c: forces a single FS sync
-D: delete snapshot
-m [tree id] directory: set the default mounted subvolume to
the [tree id] or the directory
Btrfs v0.19-16-g075587c
rich@diamonds> /usr/local/bin/btrfsctl -D snaptest
ioctl:: Operation not permitted
rich@diamonds> sudo /usr/local/bin/btrfsctl -D snaptest
ioctl:: No such file or directory
rich@diamonds> sudo /usr/local/bin/btrfsctl -D snaptest /home
ioctl:: No such file or directory
rich@diamonds> sudo /usr/local/bin/btrfsctl -D /home snaptest
ioctl:: Invalid argument
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