On Tue, Aug 27, 2013 at 03:17:54PM -0400, Jeff Mahoney wrote:
> +static int btrfs_ioctl_add_features(struct file *file, void __user *arg)
> +{
...
spin_lock(&fs_info->super_lock);
> + flags = btrfs_super_compat_flags(super_block);
> + flags |= features.compat_flags;
> + btrfs_set_super_compat_flags(super_block, flags);
> +
> + flags = btrfs_super_compat_ro_flags(super_block);
> + flags |= features.compat_ro_flags;
> + btrfs_set_super_compat_ro_flags(super_block, flags);
> +
> + flags = btrfs_super_incompat_flags(super_block);
> + flags |= features.incompat_flags;
> + btrfs_set_super_incompat_flags(super_block, flags);
spin_unlock(&fs_info->super_lock);
> + return btrfs_end_transaction(trans, root);
> + }
> +
> + return 0;
> +}
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