netdev - Re: [RFC][PATCH] ns: Syscalls for better namespace sharing control.

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Message-ID: <m1bpfbwuze.fsf@fess.ebiederm.org>
Date:	Fri, 26 Feb 2010 13:24:53 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Pavel Emelyanov <xemul@...allels.com>
Cc:	hadi@...erus.ca, Daniel Lezcano <dlezcano@...ibm.com>,
	Patrick McHardy <kaber@...sh.net>,
	Linux Netdev List <netdev@...r.kernel.org>,
	containers@...ts.linux-foundation.org,
	Netfilter Development Mailinglist 
	<netfilter-devel@...r.kernel.org>,
	Ben Greear <greearb@...delatech.com>,
	Serge Hallyn <serue@...ibm.com>,
	Matt Helsley <matthltc@...ibm.com>
Subject: Re: [RFC][PATCH] ns: Syscalls for better namespace sharing control.

Pavel Emelyanov <xemul@...allels.com> writes:

>> +static struct inode *nsfd_mkinode(void)
>> +{
>> +	struct inode *inode;
>> +	inode = new_inode(nsfd_mnt->mnt_sb);
>> +	if (!inode)
>> +		return ERR_PTR(-ENOMEM);
>> +
>> +	inode->i_fop = &nsfd_file_operations;
>> +
>> +	/*
>> +	 * Mark the inode dirty from the very beginning,
>> +	 * that way it will never be moved to the dirty
>> +	 * list because mark_inode_dirty() will think that
>> +	 * it already _is_ on the dirty list.
>> +	 */
>> +	inode->i_state = I_DIRTY;
>> +	inode->i_mode = S_IRUSR | S_IWUSR;
>> +	inode->i_uid = current_fsuid();
>> +	inode->i_gid = current_fsgid();
>> +	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
>> +	return inode;
>> +}
>
> Why not use anon inodes?

Because you can't mount them anywhere.

>> diff --git a/include/linux/nstype.h b/include/linux/nstype.h
>> new file mode 100644
>> index 0000000..3bdf856
>> --- /dev/null
>> +++ b/include/linux/nstype.h
>> @@ -0,0 +1,6 @@
>> +#ifndef _LINUX_NSTYPE_H
>> +#define _LINUX_NSTYPE_H
>> +
>> +#define NSTYPE_NET 0
>> +
>> +#endif /* _LINUX_NSTYPE_H */
>
> Yet another set of per-namespace IDs along with CLONE_NEWXXX ones?
> I currently have a way to create all namespaces we have with one
> syscall. Why don't we have an ability to enter them all with one syscall?

The CLONE_NEWXXX series of bits has been an royal pain to work with,
and it appears to be unnecessary complications for no gain.

Eric

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