[Devel] [PATCH RH7] mnt: allow to add a mount into an existing group

[Konstantin Khorenko]

On 05/06/2020 02:59 PM, Pavel Tikhomirov wrote:
> diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
> index a4ca54304220..45e2752a85c9 100644
> --- a/include/uapi/linux/fs.h
> +++ b/include/uapi/linux/fs.h
> @@ -99,6 +99,12 @@ struct inodes_stat_t {
>  #define MS_STRICTATIME	(1<<24) /* Always perform atime updates */
>  #define MS_LAZYTIME	(1<<25) /* Update the on-disk [acm]times lazily */
>
> +/*
> + * Here are commands and flags. Commands are handled in do_mount()
> + * and can intersect with kernel internal flags.
> + */
> +#define MS_SET_GROUP	(1<<26) /* Add a mount into a shared group */
> +
>  /* These sb flags are internal to the kernel */
>  #define MS_SUBMOUNT     (1<<26)

Is it OK to have the flag's semantics overloaded?

>  #define MS_NOREMOTELOCK	(1<<27)