[CRIU] [PATCH 1/3] mount: Introduce BTRFS engine

[Pavel Emelyanov]

>>> +
>>> +	fd = open(m->mountpoint, O_RDONLY);
>>> +	if (fd < 0) {
>>> +		pr_perror("Can't open mountpoint %s", m->mountpoint);
>>> +		return -1;
>>> +	}
>>> +
>>
>> Mountpoint can be unreachable. The open_mountpoint() handles this.
> 
> Hmm, open_mountpoint can be used iif the complete mount tree is created,
> so I presume you prefer to defer btrfs parsing and do it as a final stage
> of mount points tree creation, right?

Well, yes, with that constraint you're right. Maybe we can implement it
in even lazier manner -- once we need to resolve dev_t for some mount_info
we fill read that information from disks. At that time the whole mount
tree will be ready.

Thoughts?

Thanks,
Pavel