Hi Jens,

>> Am 07.02.20 um 16:50 schrieb Jens Axboe:
>>> Due to an oversight on my part, AT_FDCWD lookups only work when the
>>> lookup can be done inline, not async. This patchset rectifies that,
>>> aiming for 5.6 for this one as it would be a shame to have openat etc
>>> without that.
>>>
>>> Just 3 small simple patches - grab the task ->fs, add io-wq suppor for
>>> passing it in and setting it, and finally add a ->needs_fs to the opcode
>>> table list of requirements for openat/openat2/statx.
>>>
>>> Last patch just ensures we allow AT_FDCWD.
>>
>> Thanks! But IOSQE_FIXED_FILE is still not supported and not rejected at
>> the same time, correct?
> 
> That's in a separate patch:
> 
> https://git.kernel.dk/cgit/linux-block/commit/?h=io_uring-5.6&id=5e159663813f0b7837342426cfb68185b6609359

Do we handle the error path correct?
As far as I can see io_req_set_file() is called before
io_{statx,openat,openat2}_prep() and req->file is already filled.
Maybe a generic way would be better using io_op_defs[op].allow_fixed_file.

In the long run we may want to add support for openat2 with
IOSQE_FIXED_FILE, then Samba could register the share root directory as
fixed file and it could be used for all openat2 calls.
But for now it's fine to just reject it...

Thanks!
metze