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Wed, 17 Jun 2020 11:56:46 -0700 (PDT) To: Kanchan Joshi , axboe@kernel.dk, viro@zeniv.linux.org.uk, bcrl@kvack.org Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-aio@kvack.org, io-uring@vger.kernel.org, linux-block@vger.kernel.org, selvakuma.s1@samsung.com, nj.shetty@samsung.com, javier.gonz@samsung.com References: <1592414619-5646-1-git-send-email-joshi.k@samsung.com> <1592414619-5646-4-git-send-email-joshi.k@samsung.com> From: Pavel Begunkov Autocrypt: addr=asml.silence@gmail.com; prefer-encrypt=mutual; keydata= mQINBFmKBOQBEAC76ZFxLAKpDw0bKQ8CEiYJRGn8MHTUhURL02/7n1t0HkKQx2K1fCXClbps bdwSHrhOWdW61pmfMbDYbTj6ZvGRvhoLWfGkzujB2wjNcbNTXIoOzJEGISHaPf6E2IQx1ik9 6uqVkK1OMb7qRvKH0i7HYP4WJzYbEWVyLiAxUj611mC9tgd73oqZ2pLYzGTqF2j6a/obaqha +hXuWTvpDQXqcOZJXIW43atprH03G1tQs7VwR21Q1eq6Yvy2ESLdc38EqCszBfQRMmKy+cfp W3U9Mb1w0L680pXrONcnlDBCN7/sghGeMHjGKfNANjPc+0hzz3rApPxpoE7HC1uRiwC4et83 CKnncH1l7zgeBT9Oa3qEiBlaa1ZCBqrA4dY+z5fWJYjMpwI1SNp37RtF8fKXbKQg+JuUjAa9 Y6oXeyEvDHMyJYMcinl6xCqCBAXPHnHmawkMMgjr3BBRzODmMr+CPVvnYe7BFYfoajzqzq+h EyXSl3aBf0IDPTqSUrhbmjj5OEOYgRW5p+mdYtY1cXeK8copmd+fd/eTkghok5li58AojCba jRjp7zVOLOjDlpxxiKhuFmpV4yWNh5JJaTbwCRSd04sCcDNlJj+TehTr+o1QiORzc2t+N5iJ NbILft19Izdn8U39T5oWiynqa1qCLgbuFtnYx1HlUq/HvAm+kwARAQABtDFQYXZlbCBCZWd1 bmtvdiAoc2lsZW5jZSkgPGFzbWwuc2lsZW5jZUBnbWFpbC5jb20+iQJOBBMBCAA4FiEE+6Ju PTjTbx479o3OWt5b1Glr+6UFAlmKBOQCGwMFCwkIBwIGFQgJCgsCBBYCAwECHgECF4AACgkQ Wt5b1Glr+6WxZA//QueaKHzgdnOikJ7NA/Vq8FmhRlwgtP0+E+w93kL+ZGLzS/cUCIjn2f4Q Mcutj2Neg0CcYPX3b2nJiKr5Vn0rjJ/suiaOa1h1KzyNTOmxnsqE5fmxOf6C6x+NKE18I5Jy xzLQoktbdDVA7JfB1itt6iWSNoOTVcvFyvfe5ggy6FSCcP+m1RlR58XxVLH+qlAvxxOeEr/e aQfUzrs7gqdSd9zQGEZo0jtuBiB7k98t9y0oC9Jz0PJdvaj1NZUgtXG9pEtww3LdeXP/TkFl HBSxVflzeoFaj4UAuy8+uve7ya/ECNCc8kk0VYaEjoVrzJcYdKP583iRhOLlZA6HEmn/+Gh9 4orG67HNiJlbFiW3whxGizWsrtFNLsSP1YrEReYk9j1SoUHHzsu+ZtNfKuHIhK0sU07G1OPN 2rDLlzUWR9Jc22INAkhVHOogOcc5ajMGhgWcBJMLCoi219HlX69LIDu3Y34uIg9QPZIC2jwr 24W0kxmK6avJr7+n4o8m6sOJvhlumSp5TSNhRiKvAHB1I2JB8Q1yZCIPzx+w1ALxuoWiCdwV M/azguU42R17IuBzK0S3hPjXpEi2sK/k4pEPnHVUv9Cu09HCNnd6BRfFGjo8M9kZvw360gC1 reeMdqGjwQ68o9x0R7NBRrtUOh48TDLXCANAg97wjPoy37dQE7e5Ag0EWYoE5AEQAMWS+aBV IJtCjwtfCOV98NamFpDEjBMrCAfLm7wZlmXy5I6o7nzzCxEw06P2rhzp1hIqkaab1kHySU7g dkpjmQ7Jjlrf6KdMP87mC/Hx4+zgVCkTQCKkIxNE76Ff3O9uTvkWCspSh9J0qPYyCaVta2D1 Sq5HZ8WFcap71iVO1f2/FEHKJNz/YTSOS/W7dxJdXl2eoj3gYX2UZNfoaVv8OXKaWslZlgqN jSg9wsTv1K73AnQKt4fFhscN9YFxhtgD/SQuOldE5Ws4UlJoaFX/yCoJL3ky2kC0WFngzwRF Yo6u/KON/o28yyP+alYRMBrN0Dm60FuVSIFafSqXoJTIjSZ6olbEoT0u17Rag8BxnxryMrgR dkccq272MaSS0eOC9K2rtvxzddohRFPcy/8bkX+t2iukTDz75KSTKO+chce62Xxdg62dpkZX xK+HeDCZ7gRNZvAbDETr6XI63hPKi891GeZqvqQVYR8e+V2725w+H1iv3THiB1tx4L2bXZDI DtMKQ5D2RvCHNdPNcZeldEoJwKoA60yg6tuUquvsLvfCwtrmVI2rL2djYxRfGNmFMrUDN1Xq F3xozA91q3iZd9OYi9G+M/OA01husBdcIzj1hu0aL+MGg4Gqk6XwjoSxVd4YT41kTU7Kk+/I 5/Nf+i88ULt6HanBYcY/+Daeo/XFABEBAAGJAjYEGAEIACAWIQT7om49ONNvHjv2jc5a3lvU aWv7pQUCWYoE5AIbDAAKCRBa3lvUaWv7pfmcEACKTRQ28b1y5ztKuLdLr79+T+LwZKHjX++P 4wKjEOECCcB6KCv3hP+J2GCXDOPZvdg/ZYZafqP68Yy8AZqkfa4qPYHmIdpODtRzZSL48kM8 LRzV8Rl7J3ItvzdBRxf4T/Zseu5U6ELiQdCUkPGsJcPIJkgPjO2ROG/ZtYa9DvnShNWPlp+R uPwPccEQPWO/NP4fJl2zwC6byjljZhW5kxYswGMLBwb5cDUZAisIukyAa8Xshdan6C2RZcNs rB3L7vsg/R8UCehxOH0C+NypG2GqjVejNZsc7bgV49EOVltS+GmGyY+moIzxsuLmT93rqyII 5rSbbcTLe6KBYcs24XEoo49Zm9oDA3jYvNpeYD8rDcnNbuZh9kTgBwFN41JHOPv0W2FEEWqe JsCwQdcOQ56rtezdCJUYmRAt3BsfjN3Jn3N6rpodi4Dkdli8HylM5iq4ooeb5VkQ7UZxbCWt UVMKkOCdFhutRmYp0mbv2e87IK4erwNHQRkHUkzbsuym8RVpAZbLzLPIYK/J3RTErL6Z99N2 m3J6pjwSJY/zNwuFPs9zGEnRO4g0BUbwGdbuvDzaq6/3OJLKohr5eLXNU3JkT+3HezydWm3W OPhauth7W0db74Qd49HXK0xe/aPrK+Cp+kU1HRactyNtF8jZQbhMCC8vMGukZtWaAwpjWiiH bA== Subject: Re: [PATCH 3/3] io_uring: add support for zone-append Message-ID: <22597d21-affb-da29-9365-d8e3b6bc4e50@gmail.com> Date: Wed, 17 Jun 2020 21:55:18 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.3.0 MIME-Version: 1.0 In-Reply-To: <1592414619-5646-4-git-send-email-joshi.k@samsung.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 17/06/2020 20:23, Kanchan Joshi wrote: > From: Selvakumar S > > Introduce three new opcodes for zone-append - > > IORING_OP_ZONE_APPEND : non-vectord, similiar to IORING_OP_WRITE > IORING_OP_ZONE_APPENDV : vectored, similar to IORING_OP_WRITEV > IORING_OP_ZONE_APPEND_FIXED : append using fixed-buffers I don't like the idea of creating a new set of opcodes for each new flavour. Did you try to extend write*? > > Repurpose cqe->flags to return zone-relative offset. > > Signed-off-by: SelvaKumar S > Signed-off-by: Kanchan Joshi > Signed-off-by: Nitesh Shetty > Signed-off-by: Javier Gonzalez > --- > fs/io_uring.c | 72 +++++++++++++++++++++++++++++++++++++++++-- > include/uapi/linux/io_uring.h | 8 ++++- > 2 files changed, 77 insertions(+), 3 deletions(-) > > diff --git a/fs/io_uring.c b/fs/io_uring.c > index 155f3d8..c14c873 100644 > --- a/fs/io_uring.c > +++ b/fs/io_uring.c > @@ -649,6 +649,10 @@ struct io_kiocb { > unsigned long fsize; > u64 user_data; > u32 result; > +#ifdef CONFIG_BLK_DEV_ZONED > + /* zone-relative offset for append, in bytes */ > + u32 append_offset; > +#endif What is this doing here? It's related to append only. Should be in struct io_rw or whatever. > u32 sequence; > > struct list_head link_list; > @@ -875,6 +879,26 @@ static const struct io_op_def io_op_defs[] = { > .hash_reg_file = 1, > .unbound_nonreg_file = 1, > }, > + [IORING_OP_ZONE_APPEND] = { > + .needs_mm = 1, > + .needs_file = 1, > + .unbound_nonreg_file = 1, > + .pollout = 1, > + }, > + [IORING_OP_ZONE_APPENDV] = { > + .async_ctx = 1, > + .needs_mm = 1, > + .needs_file = 1, > + .hash_reg_file = 1, > + .unbound_nonreg_file = 1, > + .pollout = 1, > + }, > + [IORING_OP_ZONE_APPEND_FIXED] = { > + .needs_file = 1, > + .hash_reg_file = 1, > + .unbound_nonreg_file = 1, > + .pollout = 1, > + }, > }; > > static void io_wq_submit_work(struct io_wq_work **workptr); > @@ -1285,7 +1309,16 @@ static void __io_cqring_fill_event(struct io_kiocb *req, long res, long cflags) > if (likely(cqe)) { > WRITE_ONCE(cqe->user_data, req->user_data); > WRITE_ONCE(cqe->res, res); > +#ifdef CONFIG_BLK_DEV_ZONED > + if (req->opcode == IORING_OP_ZONE_APPEND || > + req->opcode == IORING_OP_ZONE_APPENDV || Nack, don't create special cases in common path. > + req->opcode == IORING_OP_ZONE_APPEND_FIXED) > + WRITE_ONCE(cqe->res2, req->append_offset); Great, a function was asked to return @cflags arg, but it decides to overwrite the field with its own stuff... Why not pass it in @cflags? > + else > + WRITE_ONCE(cqe->flags, cflags); > +#else > WRITE_ONCE(cqe->flags, cflags); > +#endif > } else if (ctx->cq_overflow_flushed) { > WRITE_ONCE(ctx->rings->cq_overflow, > atomic_inc_return(&ctx->cached_cq_overflow)); > @@ -1961,6 +1994,9 @@ static void io_complete_rw_common(struct kiocb *kiocb, long res) > static void io_complete_rw(struct kiocb *kiocb, long res, long res2) > { > struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); > +#ifdef CONFIG_BLK_DEV_ZONED > + req->append_offset = (u32)res2; > +#endif Don't create #ifdef hell all over the code. Try to use a function > > io_complete_rw_common(kiocb, res); > io_put_req(req); > @@ -1976,6 +2012,9 @@ static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2) > if (res != req->result) > req_set_fail_links(req); > req->result = res; > +#ifdef CONFIG_BLK_DEV_ZONED > + req->append_offset = (u32)res2; > +#endif > if (res != -EAGAIN) > WRITE_ONCE(req->iopoll_completed, 1); > } > @@ -2408,7 +2447,8 @@ static ssize_t io_import_iovec(int rw, struct io_kiocb *req, > u8 opcode; > > opcode = req->opcode; > - if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { > + if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED || > + opcode == IORING_OP_ZONE_APPEND_FIXED) { > *iovec = NULL; > return io_import_fixed(req, rw, iter); > } > @@ -2417,7 +2457,8 @@ static ssize_t io_import_iovec(int rw, struct io_kiocb *req, > if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT)) > return -EINVAL; > > - if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { > + if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE || > + opcode == IORING_OP_ZONE_APPEND) { > if (req->flags & REQ_F_BUFFER_SELECT) { > buf = io_rw_buffer_select(req, &sqe_len, needs_lock); > if (IS_ERR(buf)) { > @@ -2704,6 +2745,9 @@ static int io_write(struct io_kiocb *req, bool force_nonblock) > req->rw.kiocb.ki_flags &= ~IOCB_NOWAIT; > > req->result = 0; > +#ifdef CONFIG_BLK_DEV_ZONED > + req->append_offset = 0; > +#endif > io_size = ret; > if (req->flags & REQ_F_LINK_HEAD) > req->result = io_size; > @@ -2738,6 +2782,13 @@ static int io_write(struct io_kiocb *req, bool force_nonblock) > __sb_writers_release(file_inode(req->file)->i_sb, > SB_FREEZE_WRITE); > } > +#ifdef CONFIG_BLK_DEV_ZONED > + if (req->opcode == IORING_OP_ZONE_APPEND || > + req->opcode == IORING_OP_ZONE_APPENDV || > + req->opcode == IORING_OP_ZONE_APPEND_FIXED) > + kiocb->ki_flags |= IOCB_ZONE_APPEND; > +#endif > + > kiocb->ki_flags |= IOCB_WRITE; > > if (!force_nonblock) > @@ -4906,6 +4957,12 @@ static int io_req_defer_prep(struct io_kiocb *req, > case IORING_OP_WRITEV: > case IORING_OP_WRITE_FIXED: > case IORING_OP_WRITE: > +#ifdef CONFIG_BLK_DEV_ZONED > + fallthrough; > + case IORING_OP_ZONE_APPEND: > + case IORING_OP_ZONE_APPENDV: > + case IORING_OP_ZONE_APPEND_FIXED: > +#endif > ret = io_write_prep(req, sqe, true); > break; > case IORING_OP_POLL_ADD: > @@ -5038,6 +5095,12 @@ static void io_cleanup_req(struct io_kiocb *req) > case IORING_OP_WRITEV: > case IORING_OP_WRITE_FIXED: > case IORING_OP_WRITE: > +#ifdef CONFIG_BLK_DEV_ZONED > + fallthrough; > + case IORING_OP_ZONE_APPEND: > + case IORING_OP_ZONE_APPENDV: > + case IORING_OP_ZONE_APPEND_FIXED: > +#endif > if (io->rw.iov != io->rw.fast_iov) > kfree(io->rw.iov); > break; > @@ -5086,6 +5149,11 @@ static int io_issue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe, > } > ret = io_read(req, force_nonblock); > break; > +#ifdef CONFIG_BLK_DEV_ZONED > + case IORING_OP_ZONE_APPEND: > + case IORING_OP_ZONE_APPENDV: > + case IORING_OP_ZONE_APPEND_FIXED: > +#endif > case IORING_OP_WRITEV: > case IORING_OP_WRITE_FIXED: > case IORING_OP_WRITE: > diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h > index 92c2269..6c8e932 100644 > --- a/include/uapi/linux/io_uring.h > +++ b/include/uapi/linux/io_uring.h > @@ -130,6 +130,9 @@ enum { > IORING_OP_PROVIDE_BUFFERS, > IORING_OP_REMOVE_BUFFERS, > IORING_OP_TEE, > + IORING_OP_ZONE_APPEND, > + IORING_OP_ZONE_APPENDV, > + IORING_OP_ZONE_APPEND_FIXED, > > /* this goes last, obviously */ > IORING_OP_LAST, > @@ -157,7 +160,10 @@ enum { > struct io_uring_cqe { > __u64 user_data; /* sqe->data submission passed back */ > __s32 res; /* result code for this event */ > - __u32 flags; > + union { > + __u32 res2; /* res2 like aio, currently used for zone-append */ > + __u32 flags; > + }; > }; > > /* > -- Pavel Begunkov