In Li Zefan's commit dae7b665cf6d6e6e733f1c9c16cf55547dd37e33,
a combination call of kmalloc() and copy_from_user() is replaced by
memdup_user(). So btrfs_ioctl_resize() doesn't use GFP_NOFS any more.
Signed-off-by: Li Hong <lihong.hi@gmail.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>