Btrfs: Refactor btrfs_ioctl_snap_create()
Split it into two functions for two different ioctls, since they
share no common code.
Signed-off-by: 
Li Zefan <lizf@cn.fujitsu.com>
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Split it into two functions for two different ioctls, since they
share no common code.
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>