[Virtio-fs] Ways to uniquely and persistently identify nodes

[Max Reitz]

On 15.01.20 12:51, Miklos Szeredi wrote:
> On Wed, Jan 15, 2020 at 11:10 AM Miklos Szeredi <mszeredi at redhat.com> wrote:
> 
>> New operations needed:
>>
>> LOOKUP_WITH_HANDLE: same as LOOKUP, but returns handle in addition to
>> fuse_ino_t and attributes.
>> LOOKUP_BY_HANDLE: same as LOOKUP, but gets a handle as input.
> 
> And that can be reduced further to a single extended LOOKUP_HANDLE,
> which takes a handle as input and returns a handle in addition to the
> usual stuff.  The lookup-by-handle case can be done with a special
> name.  Currently "." is used for this purpose in the fuse protocol,
> which is a bit confusing since it has nothing to do the "." directory
> entry, but at least we don't have to introduce a new concept for this.

I’m afraid I don’t quite understand.  What handle would LOOKUP_HANDLE
take as input when I want to open a new file (as in, LOOKUP_WITH_HANDLE)?

Max

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