This adds two new unprivileged ioctls:
1st patch: version of tree_search ioctl which only searches/returns subvolume
2nd patch: user version of ino_lookup ioctl which also performs permission
They will be used to implement user version of "subvolume list/show" etc in
See each commit log for more detals.
The RFC implementation of btrfs-progs can be found in the ML titled as follows:
[RFC PATCH 0/7] btrfs-progs: Allow normal user to call "subvolume list/show"
Tomohiro Misono (2):
btrfs: Add unprivileged subvolume search ioctl
btrfs: Add unprivileged version of ino_lookup ioctl
fs/btrfs/ioctl.c | 472 +++++++++++++++++++++++++++++++++++++++++++++
include/uapi/linux/btrfs.h | 18 ++
2 files changed, 490 insertions(+)
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