On Fri, 2014-05-09 at 20:27 -0400, Richard Guy Briggs wrote:
> Generate and assign a serial number per namespace instance since boot.
>
> Use a serial number per namespace (unique across one boot of one kernel)
> instead of the inode number (which is claimed to have had the right to change
> reserved and is not necessarily unique if there is more than one proc fs) to
> uniquely identify it per kernel boot.
>
> Signed-off-by: Richard Guy Briggs <r...@redhat.com>
> ---
> +/**
> + * ns_serial - compute a serial number for the namespace
> + *
> + * Compute a serial number for the namespace to uniquely identify it in
> + * audit records.
> + */
> +unsigned long long ns_serial(void)
> +{
> + static DEFINE_SPINLOCK(serial_lock);
> + static unsigned long long serial = 4; /* reserved for IPC, UTS, user,
> PID */
> + unsigned long flags;
> +
> + spin_lock_irqsave(&serial_lock, flags);
> + ++serial;
> + spin_unlock_irqrestore(&serial_lock, flags);
> + BUG_ON(!serial);
> +
> + return serial;
> +}
> +
> static inline struct nsproxy *create_nsproxy(void)
> {
> struct nsproxy *nsproxy;
atomic64_t instead of doing it yourself?
and why _irqsave() ? Can we seriously create new namespaces in irq
context? If you use the atomic though, you don't have to worry about
it...
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