From: Li Zefan <lizf@cn.fujitsu.com>
Date: Mon, 20 Dec 2010 08:30:25 +0000 (+0800)
Subject: Btrfs: Add BTRFS_IOC_SUBVOL_GETFLAGS/SETFLAGS ioctls
X-Git-Tag: v2.6.38-rc1~14^2~16^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0caa102da82799efaba88e234484786a9591c797;p=pandora-kernel.git

Btrfs: Add BTRFS_IOC_SUBVOL_GETFLAGS/SETFLAGS ioctls

This allows us to set a snapshot or a subvolume readonly or writable
on the fly.

Usage:

Set BTRFS_SUBVOL_RDONLY of btrfs_ioctl_vol_arg_v2->flags, and then
call ioctl(BTRFS_IOCTL_SUBVOL_SETFLAGS);

Changelog for v3:

- Change to pass __u64 as ioctl parameter.

Changelog for v2:

- Add _GETFLAGS ioctl.
- Check if the passed fd is the root of a subvolume.
- Change the name from _SNAP_SETFLAGS to _SUBVOL_SETFLAGS.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
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