This RFC implements user version of "subvolume list/show" using two new ioctls.
The ioctl patch to the kernel can be found in the ML titled 
  "[PATCH 0/2] btrfs: Add two new unprivileged ioctls to allow normal users to 
call "sub list/show" etc."

1st-4th are some prepartion works.
5th patch is the main part.
6th-7th adds the test for "subvolume list"

The main behavior differences between root and normal users are:
 - "subvolume list" only lists subvolumes which exist under the specified path.
   (The specified path itself is not needed to be a subvolume.)
 - snapshot filed of "subvolume show" just lists the snapshots under the 
specified path.

This is a part of RFC I sent last December[1] whose aim is to improve normal 
users' usability.
The remaining works of RFC are: 
  - Allow "sub delete" for empty subvolume
  - Allow "qgroup show" to check quota limit


Tomohiro Misono (7):
  btrfs-progs: Add 2 definitions of new unprivileged ioctl
  btrfs-progs: sub list: Add helper function which checks the permission
    for tree search ioctl
  btrfs-progs: sub list: Pass specified path down to
  btrfs-progs: fallback to open without O_NOATIME flag in
  btrfs-progs: sub list: Allow normal user to call "subvolume list/show"
  btrfs-progs: test: Add helper function to check if test user exists
  btrfs-porgs: test: Add cli-test/009 to check subvolume list for both
    root and normal user

 btrfs-list.c                               | 289 +++++++++++++++++++++++++++--
 btrfs-list.h                               |   8 +-
 cmds-subvolume.c                           |  12 +-
 ioctl.h                                    |  19 ++
 tests/cli-tests/009-subvolume-list/ | 136 ++++++++++++++
 tests/common                               |  10 +
 utils.c                                    |  13 +-
 7 files changed, 464 insertions(+), 23 deletions(-)
 create mode 100755 tests/cli-tests/009-subvolume-list/


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