Re: query about create_mnt_ns

[Rajat Sharma]

Thanks :)

On Mon, Feb 11, 2013 at 7:40 PM, Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote:
> On Mon, Feb 11, 2013 at 05:44:29PM +0530, Rajat Sharma wrote:
>> Hi,
>>
>> I was looking at implementation of init_mount_tree() function and
>> found a discrepancy in list manipulation of mnt_namsespace and
>> vfsmount across kernel version 2.6.30. Up till kernel version
>> 2.6.30.x, vfsmount structure was added to the list headed by
>> mnt_namespace structure just allocated:
>>
>> list_add(&mnt->mnt_list, &ns->list);
>>
>> Beyond that with the introduction of function create_mnt_ns(), it does
>> reverse of previous behavior:
>>
>> list_add(&new_ns->list, &mnt->mnt_list);
>>
>> i.e. it is adding new mnt_namespace to the vfsmount list. Is this the
>> expected behavior? i.e. do we want to maintain list of namespaces per
>> mount? Please let me know if I am missing something here.
>
> The fact that if A and B are both empty, list_add(A, B) and list_add(B, A)
> will do exactly the same thing ;-)
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