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1ipEG3-0008Pv-0I; Wed, 08 Jan 2020 16:32:35 +0000 To: Jens Axboe , io-uring@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, viro@zeniv.linux.org.uk References: <20200107170034.16165-1-axboe@kernel.dk> <20200107170034.16165-4-axboe@kernel.dk> <82a015c4-f5b9-7c85-7d80-78964cb0d82e@samba.org> <4ccb935c-7ff9-592f-8c27-0af3d38326d7@kernel.dk> From: Stefan Metzmacher Autocrypt: addr=metze@samba.org; prefer-encrypt=mutual; keydata= xsNNBFYI3MgBIACtBo6mgqbCv5vkv8GSjJH607nvXIT65moPUe6qAm2lYPP6oZUI5SNLhbO3 rMYfMxBFfWS/0WF8840mDvhqPI+lJGfvJ1Y2r8a9JPuqsk6vwLedv62TQe5J3qMCR2y4TTK1 Pkqss3P9kqWn5SVXntAYjLT06Qh96gQ9la9qwj6+izqMdAoGFt5ak7Sw7jJ06U3AawZDawb2 +4q7KwaDwTWeUifIC54tXp+au5Q17rhKq94LTcdptkLfC5ix2cyApsr84El/82LFUOzZdyRA 7VS8gkhuAZG7tM1MbCIbGk0O3SFlT+CvZczfjtoxVdjYvGRDwBFlSIUwo3Os2aStstvYog7r r9vujWGSf5odBSogRvACCFwuGLVUBSBw/If0Wb0WgHnkdVcKfjNpznBqUfG6mGhnQMv3KlbM rprYTGBOn/Ufjw7zG6Et2UrmnHKbnSs1sG+Ka4Qg4uRM45xlNKn1SYJVSd1DnUqF1kwK2ncx 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DHimFW86BtuFMnBIYa342y2zjAwYiKHh/KE4EdgtDXviGMFygUrfPxOyVo1mWA5WveCsw1U3 BnYZ/lIyAQwDUyuZ6QWx2Sqos3CmTxB4DhczBAGDyVKyKx1C7UO9t8PkI4E+nw176gYidOGG EKit9OEborPdR8HrP4f8CTgPCUI0uIQTYswHH9HhSq8d1maM+4SmsvoQT+s4lt8kvJp9ce6B uWrtpKE+BrlhmZrZleospHp05F+oHuE7lrOg09g0SFdTigqSJNbN1R/pkPI5Q03GfbWipsd4 iY0Rj0D34DQVeKAa4qUlOcBgX2D9VHRap9GKQRWs//egCueqDZNmIk3071aFV+BSiBSTZIIG t/YZOE37yKSj2rcCbqg= Subject: Re: [PATCH 3/6] io_uring: add support for IORING_OP_OPENAT Message-ID: <2afdd5a5-0eb5-8fba-58d1-03001abbab7e@samba.org> Date: Wed, 8 Jan 2020 17:32:29 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 MIME-Version: 1.0 In-Reply-To: <4ccb935c-7ff9-592f-8c27-0af3d38326d7@kernel.dk> Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="MwjyJ4oTbAhB0xUm3HFMvyMkp5RZhLrr4" Sender: io-uring-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --MwjyJ4oTbAhB0xUm3HFMvyMkp5RZhLrr4 Content-Type: multipart/mixed; boundary="GI37aoWfvNiXMXowJDwzHyBbGcWyUqpzW"; protected-headers="v1" From: Stefan Metzmacher To: Jens Axboe , io-uring@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, viro@zeniv.linux.org.uk Message-ID: <2afdd5a5-0eb5-8fba-58d1-03001abbab7e@samba.org> Subject: Re: [PATCH 3/6] io_uring: add support for IORING_OP_OPENAT References: <20200107170034.16165-1-axboe@kernel.dk> <20200107170034.16165-4-axboe@kernel.dk> <82a015c4-f5b9-7c85-7d80-78964cb0d82e@samba.org> <4ccb935c-7ff9-592f-8c27-0af3d38326d7@kernel.dk> In-Reply-To: <4ccb935c-7ff9-592f-8c27-0af3d38326d7@kernel.dk> --GI37aoWfvNiXMXowJDwzHyBbGcWyUqpzW Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable Am 08.01.20 um 17:20 schrieb Jens Axboe: > On 1/8/20 6:05 AM, Stefan Metzmacher wrote: >> Hi Jens, >> >>> This works just like openat(2), except it can be performed async. For= >>> the normal case of a non-blocking path lookup this will complete >>> inline. If we have to do IO to perform the open, it'll be done from >>> async context. >> >> Did you already thought about the credentials being used for the async= >> open? The application could call setuid() and similar calls to change >> the credentials of the userspace process/threads. In order for >> applications like samba to use this async openat, it would be required= >> to specify the credentials for each open, as we have to multiplex >> requests from multiple user sessions in one process. >> >> This applies to non-fd based syscall. Also for an async connect >> to a unix domain socket. >> >> Do you have comments on this? >=20 > The open works like any of the other commands, it inherits the > credentials that the ring was setup with. Same with the memory context,= > file table, etc. There's currently no way to have multiple personalitie= s > within a single ring. Ah, it's user =3D get_uid(current_user()); and ctx->user =3D user in io_uring_create(), right? > Sounds like you'd like an option for having multiple personalities > within a single ring? I'm not sure anymore, I wasn't aware of the above. > I think it would be better to have a ring per personality instead. We could do that. I guess we could use per user rings for path based operations and a single ring for fd based operations. > One thing we could do to make this more lightweight > is to have rings that are associated, so that we can share a lot of the= > backend processing between them. My current idea is to use the ring fd and pass it to our main epoll loop.= Can you be more specific about how an api for associated rings could look like? Thanks! metze --GI37aoWfvNiXMXowJDwzHyBbGcWyUqpzW-- --MwjyJ4oTbAhB0xUm3HFMvyMkp5RZhLrr4 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEfFbGo3YXpfgryIw9DbX1YShpvVYFAl4WBB0ACgkQDbX1YShp vVamDBAAjuPuM7R6rUEN6KwuODpfFk5nvAyF6jHriTDTUjWTZt3/IHwKDGRdlfbB 09CmYfwMLihSLJPQ3FmUm2vT/Gm37R8KEMBk3EXcmrHgkCPbRETb3YSc3w+BZcCx yau0RRCjzCOjdSlYiClftHaEubECHD0mfYw5uXsHjqQUdt0b1Je3x+ebd3oYx2L6 Fh8SW9oS2XL71csE1koa67uW/IuZquIMv8PrIDcHTdMaBd8yfzJ3s8aN7Lg0uHtw 2GjJqSHrGH1FGMHpIc7SMWvP7zKT3ZLy1ZmcNpeZs2Rnb9odTvYXiRxZSx+hw81d Rg+SGTPCi8FkOaFnUnmLfKPhGcnfUUf9/GLwdbKdszGX98ncmTJwTE4jG7V8KuDh ay7LXunmx94a6pOIRfNnn6Q6XeCVOCt5YbVl8IPijsxKSxc9GSmzNbfVO+cqvoYu yC8j0nZDoeaLTITs8JHdj0SajPDNxDqWDrLP0fSSe8uoJfF/QPyJNWZLcH5fuKX3 nSYNA8lDMUFqxZ8dVQqwtFqhemctuXmuMoJZSNZIiCKYaW5zc8eZ7aerrXYUxGYV fkZd6J9kEo2D+lfk/ucYQZT2C1v38c96F9VTF8brfw2Oo5Augrm536Wq8+YbI2j2 NotMxr/Uie1zm5i7MDP5K2T4KitheLpvC+emqYYCvHtrHpcWIpo= =uMmE -----END PGP SIGNATURE----- --MwjyJ4oTbAhB0xUm3HFMvyMkp5RZhLrr4--