Re: [PATCH 3/3] nfs: Store and use inode in nfs_open_context

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On Wed, Mar 2, 2016 at 9:31 AM, Trond Myklebust
<trond.myklebust@xxxxxxxxxxxxxxx> wrote:
> On Wed, Mar 2, 2016 at 9:27 AM, Goldwyn Rodrigues <rgoldwyn@xxxxxxx> wrote:
>>
>>
>>
>> On 03/01/2016 02:46 PM, Trond Myklebust wrote:
>>>
>>> On Tue, Mar 1, 2016 at 1:12 PM, Goldwyn Rodrigues <rgoldwyn@xxxxxxx> wrote:
>>>>
>>>>
>>>> From: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
>>>>
>>>> NFS translates the inode from the dentry and uses sb from the dentry
>>>> parameters. However, using NFS in conjunction with overlayfs, the inodes
>>>> associated with dentries may be associated with overlayfs as opposed
>>>> to NFS. So, store inode in nfs_open_context and use d_select_inode()
>>>> to translate dentry to inode.
>>>
>>>
>>> I don't see how this helps. The dentry and dentry->d_sb that are
>>> associated with the open context need to be NFS namespace objects,
>>> otherwise all sorts of things, ranging from inode lookup to NFSv4
>>> state recovery are going to break.
>>>
>>
>> dentry evaluations and inode lookups are done by overlayfs, with the help of NFS. NFS becomes a subset of overlayfs. However, you are right. state recovery will break with this patch.
>>
>> Which makes me wonder: Shouldn't nfs_open_context (or any open context) be with respect to an inode as opposed to a dentry?
>
> No. It is designed the way it is precisely because it needs namespace
> information.

IOW: this has never been intended to be an overlayfs object. It needs
to reflect the _real_ NFS namespace for various reasons (including
recovery).
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