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Wed, 16 Oct 2024 11:37:47 +0000 (GMT) Received: from epsmgmc1p1new.samsung.com (unknown [182.195.42.40]) by epsmtrp1.samsung.com (KnoxPortal) with ESMTP id 20241016113747epsmtrp1f416b0972e498ffb7e22bae5484e113b~_6_Mvz4fa0254402544epsmtrp1t; Wed, 16 Oct 2024 11:37:47 +0000 (GMT) X-AuditID: b6c32a44-6dbff7000000217e-26-670fb366331e Received: from epsmtip1.samsung.com ( [182.195.34.30]) by epsmgmc1p1new.samsung.com (Symantec Messaging Gateway) with SMTP id CF.9A.07371.B85AF076; Wed, 16 Oct 2024 20:37:47 +0900 (KST) Received: from localhost.localdomain (unknown [107.99.41.245]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20241016113745epsmtip1125d8d26ee15ee70412c75ac746a6bf6~_6_KnXcxQ2871328713epsmtip15; Wed, 16 Oct 2024 11:37:45 +0000 (GMT) From: Anuj Gupta To: axboe@kernel.dk, hch@lst.de, kbusch@kernel.org, martin.petersen@oracle.com, asml.silence@gmail.com, anuj1072538@gmail.com, krisman@suse.de Cc: io-uring@vger.kernel.org, linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, gost.dev@samsung.com, linux-scsi@vger.kernel.org, vishak.g@samsung.com, Anuj Gupta , Kanchan Joshi Subject: [PATCH v4 07/11] io_uring/rw: add support to send meta along with read/write Date: Wed, 16 Oct 2024 16:59:08 +0530 Message-Id: <20241016112912.63542-8-anuj20.g@samsung.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20241016112912.63542-1-anuj20.g@samsung.com> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrBJsWRmVeSWpSXmKPExsWy7bCmlm7aZv50g7vLJSw+fv3NYtE04S+z xZxV2xgtVt/tZ7O4eWAnk8XK1UeZLN61nmOxOPr/LZvFpEPXGC22n1nKbLH3lrbF/GVP2S26 r+9gs1h+/B+TxflZc9gd+D12zrrL7nH5bKnHplWdbB6bl9R77L7ZwObx8ektFo++LasYPTaf rvb4vEkugDMq2yYjNTEltUghNS85PyUzL91WyTs43jne1MzAUNfQ0sJcSSEvMTfVVsnFJ0DX LTMH6HwlhbLEnFKgUEBicbGSvp1NUX5pSapCRn5xia1SakFKToFJgV5xYm5xaV66Xl5qiZWh gYGRKVBhQnZG294pbAXbbCua1s5hamCcYNTFyMkhIWAiMXV7H3MXIxeHkMBuRomF7T/ZIJxP jBJnzsxjhHC+MUoc7L7GCNNypmsmC4gtJLCXUWLGfmGIos+MEhPOTGYHSbAJqEsced4K1iAi MIlR4vnlUJAiZoH3jBLv9y9nBUkIC4RL/NzyjQ3EZhFQleg9/BoszitgKTH/6Hw2iG3yEjMv fQcbyilgJXHq3EF2iBpBiZMzn4BdwQxU07x1NtgTEgJ7OCTWrD4L1ewiceTMLyYIW1ji1fEt 7BC2lMTL/jYoO13ix+WnUDUFEs3H9kG9aS/ReqofaCgH0AJNifW79CHCshJTT61jgtjLJ9H7 +wlUK6/EjnkwtpJE+8o5ULaExN5zDVC2h8Tir3tZISHXyyixZrLYBEaFWUjemYXknVkImxcw Mq9ilEwtKM5NT002LTDMSy2Hx3Jyfu4mRnCS1nLZwXhj/j+9Q4xMHIyHGCU4mJVEeCd18aYL 8aYkVlalFuXHF5XmpBYfYjQFhvdEZinR5HxgnsgriTc0sTQwMTMzM7E0NjNUEud93To3RUgg PbEkNTs1tSC1CKaPiYNTqoFp4dSc148OruJ6K1l95tfpK0cz3au3TX19PGyL5I7JL/bO8CpV Xzi5aUbeG0Zd66CEUrGash8T/d5w2CRcfGhzTV+l4Em94xL3+W8bls9MeJv+4rCQlNBzhRUz 1/afLpovJHn+Ufq6QCmGC5PP9PnxTDf6rBYWVtXrd/aBoLTlsdnWa6vnxjwqOnvG60Izo/hx jVLrrqC382avnbNgvxNTtov0bdG3592r3zM2Tcq4ujBWenHxeoXPSfEShSo89vE7ZsarpMr7 HfrDnGz52nSd57wbaVErTxc5t3MX1a+P159XO1Nl0vHp0y3NjKq21fPG5aWWZXWqaWzde2Fn HEPSd5HW+yc/p2W6JJ+davtQiaU4I9FQi7moOBEAO0BONFsEAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFmpkkeLIzCtJLcpLzFFi42LZdlhJTrd7KX+6wa+txhYfv/5msWia8JfZ Ys6qbYwWq+/2s1ncPLCTyWLl6qNMFu9az7FYHP3/ls1i0qFrjBbbzyxltth7S9ti/rKn7Bbd 13ewWSw//o/J4vysOewO/B47Z91l97h8ttRj06pONo/NS+o9dt9sYPP4+PQWi0ffllWMHptP V3t83iQXwBnFZZOSmpNZllqkb5fAldG2dwpbwTbbiqa1c5gaGCcYdTFyckgImEic6ZrJ0sXI xSEksJtRYtaxZ4wQCQmJUy+XQdnCEiv/PWeHKPrIKPFo1il2kASbgLrEkeetjCAJEYFZjBKH Z81nAnGYBb4zSkxbfo0FpEpYIFRi5ZMtYDaLgKpE7+HXrCA2r4ClxPyj89kgVshLzLz0HWwq p4CVxKlzB8FsIaCaf5M/MELUC0qcnPkEbA4zUH3z1tnMExiB1iKkZiFJLWBkWsUomVpQnJue m2xYYJiXWq5XnJhbXJqXrpecn7uJERxLWho7GO/N/6d3iJGJg/EQowQHs5II76Qu3nQh3pTE yqrUovz4otKc1OJDjNIcLErivIYzZqcICaQnlqRmp6YWpBbBZJk4OKUamK53h9/+uUwzd4Le tZnrdiatvHb5/uY79z5Lm3Pf8/z6nWUj+6a3mQfSfS7ftLjDrJU1kz895eL6T9kSHNIm3p8z C172SLF2vy9xONvtVNlQ2nHNbhlfIuN2k6L9h3N+s8foXrN0s4uofV2sYpqnF7XI9eF5gyUx YU/Tt4q+iPeb7hWe3pFQYZj5pyeDLfPd01UMLKuM/nGx2l0/2v+1N2HHbP16yRdhqw08zzvY f1x/Pu7Wn/Anz6rOnTVjOeHR0x1VaOeycLd/04fVuQGJb13uXrYpWutl1GJbZePd1WXy6XD9 D6H+fRcy1G5X1pt+syts8bh4snKPbOIhyaOVhcW7TL69/7KRJ+aGeKyeEktxRqKhFnNRcSIA PssA2RQDAAA= X-CMS-MailID: 20241016113747epcas5p4e276eb0da2695ba032ce1d2a3b83fff4 X-Msg-Generator: CA X-Sendblock-Type: REQ_APPROVE CMS-TYPE: 105P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20241016113747epcas5p4e276eb0da2695ba032ce1d2a3b83fff4 References: <20241016112912.63542-1-anuj20.g@samsung.com> This patch adds the capability of sending meta along with read/write. This meta is represented by a newly introduced 'struct io_uring_meta' which specifies information such as meta type,flags,buffer,length,seed and apptag. Application sets up a SQE128 ring, prepares io_uring_meta within the second SQE. The patch processes the user-passed information to prepare uio_meta descriptor and passes it down using kiocb->private. Meta exchange is supported only for direct IO. Also vectored read/write operations with meta are not supported currently. Signed-off-by: Anuj Gupta Signed-off-by: Kanchan Joshi --- include/uapi/linux/io_uring.h | 26 ++++++++++++ io_uring/io_uring.c | 6 +++ io_uring/rw.c | 75 +++++++++++++++++++++++++++++++++-- io_uring/rw.h | 15 ++++++- 4 files changed, 118 insertions(+), 4 deletions(-) diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index 86cb385fe0b5..1cd165720fcc 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -105,6 +105,32 @@ struct io_uring_sqe { */ __u8 cmd[0]; }; + /* + * If the ring is initialized with IORING_SETUP_SQE128, then + * this field is starting offset for 64 bytes of data. For meta io + * this contains 'struct io_uring_meta' + */ + __u8 big_sqe_cmd[0]; +}; + +enum io_uring_sqe_meta_type_bits { + META_TYPE_INTEGRITY_BIT, + /* not a real meta type; just to make sure that we don't overflow */ + META_TYPE_LAST_BIT, +}; + +/* meta type flags */ +#define META_TYPE_INTEGRITY (1U << META_TYPE_INTEGRITY_BIT) + +/* this goes to SQE128 */ +struct io_uring_meta { + __u16 meta_type; + __u16 meta_flags; + __u32 meta_len; + __u64 meta_addr; + __u32 seed; + __u16 app_tag; + __u8 pad[42]; }; /* diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index d7ad4ea5f40b..e5551e2e7bde 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -3857,6 +3857,12 @@ static int __init io_uring_init(void) /* top 8bits are for internal use */ BUILD_BUG_ON((IORING_URING_CMD_MASK & 0xff000000) != 0); + BUILD_BUG_ON(sizeof(struct io_uring_meta) > + sizeof(struct io_uring_sqe)); + + BUILD_BUG_ON(META_TYPE_LAST_BIT > + 8 * sizeof_field(struct io_uring_meta, meta_type)); + io_uring_optable_init(); /* diff --git a/io_uring/rw.c b/io_uring/rw.c index 80ae3c2ebb70..b727e5ef19fc 100644 --- a/io_uring/rw.c +++ b/io_uring/rw.c @@ -257,6 +257,49 @@ static int io_prep_rw_setup(struct io_kiocb *req, int ddir, bool do_import) return 0; } +static inline void io_meta_save_state(struct io_async_rw *io) +{ + io->meta_state.seed = io->meta.seed; + iov_iter_save_state(&io->meta.iter, &io->meta_state.iter_meta); +} + +static inline void io_meta_restore(struct io_async_rw *io) +{ + io->meta.seed = io->meta_state.seed; + iov_iter_restore(&io->meta.iter, &io->meta_state.iter_meta); +} + +static int io_prep_rw_meta(struct io_kiocb *req, const struct io_uring_sqe *sqe, + struct io_rw *rw, int ddir) +{ + const struct io_uring_meta *md = (struct io_uring_meta *)sqe->big_sqe_cmd; + u16 meta_type = READ_ONCE(md->meta_type); + const struct io_issue_def *def; + struct io_async_rw *io; + int ret; + + if (!meta_type) + return 0; + if (!(meta_type & META_TYPE_INTEGRITY)) + return -EINVAL; + + def = &io_issue_defs[req->opcode]; + if (def->vectored) + return -EOPNOTSUPP; + + io = req->async_data; + io->meta.flags = READ_ONCE(md->meta_flags); + io->meta.app_tag = READ_ONCE(md->app_tag); + io->meta.seed = READ_ONCE(md->seed); + ret = import_ubuf(ddir, u64_to_user_ptr(READ_ONCE(md->meta_addr)), + READ_ONCE(md->meta_len), &io->meta.iter); + if (unlikely(ret < 0)) + return ret; + rw->kiocb.ki_flags |= IOCB_HAS_METADATA; + io_meta_save_state(io); + return ret; +} + static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe, int ddir, bool do_import) { @@ -279,11 +322,18 @@ static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe, rw->kiocb.ki_ioprio = get_current_ioprio(); } rw->kiocb.dio_complete = NULL; + rw->kiocb.ki_flags = 0; rw->addr = READ_ONCE(sqe->addr); rw->len = READ_ONCE(sqe->len); rw->flags = READ_ONCE(sqe->rw_flags); - return io_prep_rw_setup(req, ddir, do_import); + ret = io_prep_rw_setup(req, ddir, do_import); + + if (unlikely(ret)) + return ret; + if (unlikely(req->ctx->flags & IORING_SETUP_SQE128)) + ret = io_prep_rw_meta(req, sqe, rw, ddir); + return ret; } int io_prep_read(struct io_kiocb *req, const struct io_uring_sqe *sqe) @@ -410,7 +460,10 @@ static inline loff_t *io_kiocb_update_pos(struct io_kiocb *req) static void io_resubmit_prep(struct io_kiocb *req) { struct io_async_rw *io = req->async_data; + struct io_rw *rw = io_kiocb_to_cmd(req, struct io_rw); + if (unlikely(rw->kiocb.ki_flags & IOCB_HAS_METADATA)) + io_meta_restore(io); iov_iter_restore(&io->iter, &io->iter_state); } @@ -777,8 +830,12 @@ static inline int io_iter_do_read(struct io_rw *rw, struct iov_iter *iter) static bool need_complete_io(struct io_kiocb *req) { + struct io_rw *rw = io_kiocb_to_cmd(req, struct io_rw); + + /* Exclude meta IO as we don't support partial completion for that */ return req->flags & REQ_F_ISREG || - S_ISBLK(file_inode(req->file)->i_mode); + S_ISBLK(file_inode(req->file)->i_mode) || + !(rw->kiocb.ki_flags & IOCB_HAS_METADATA); } static int io_rw_init_file(struct io_kiocb *req, fmode_t mode, int rw_type) @@ -795,7 +852,7 @@ static int io_rw_init_file(struct io_kiocb *req, fmode_t mode, int rw_type) if (!(req->flags & REQ_F_FIXED_FILE)) req->flags |= io_file_get_flags(file); - kiocb->ki_flags = file->f_iocb_flags; + kiocb->ki_flags |= file->f_iocb_flags; ret = kiocb_set_rw_flags(kiocb, rw->flags, rw_type); if (unlikely(ret)) return ret; @@ -824,6 +881,14 @@ static int io_rw_init_file(struct io_kiocb *req, fmode_t mode, int rw_type) kiocb->ki_complete = io_complete_rw; } + if (unlikely(kiocb->ki_flags & IOCB_HAS_METADATA)) { + struct io_async_rw *io = req->async_data; + + if (!(req->file->f_flags & O_DIRECT)) + return -EOPNOTSUPP; + kiocb->private = &io->meta; + } + return 0; } @@ -898,6 +963,8 @@ static int __io_read(struct io_kiocb *req, unsigned int issue_flags) * manually if we need to. */ iov_iter_restore(&io->iter, &io->iter_state); + if (unlikely(kiocb->ki_flags & IOCB_HAS_METADATA)) + io_meta_restore(io); do { /* @@ -1102,6 +1169,8 @@ int io_write(struct io_kiocb *req, unsigned int issue_flags) } else { ret_eagain: iov_iter_restore(&io->iter, &io->iter_state); + if (unlikely(kiocb->ki_flags & IOCB_HAS_METADATA)) + io_meta_restore(io); if (kiocb->ki_flags & IOCB_WRITE) io_req_end_write(req); return -EAGAIN; diff --git a/io_uring/rw.h b/io_uring/rw.h index 3f432dc75441..af9e338b2bd8 100644 --- a/io_uring/rw.h +++ b/io_uring/rw.h @@ -1,6 +1,12 @@ // SPDX-License-Identifier: GPL-2.0 #include +#include + +struct io_meta_state { + u32 seed; + struct iov_iter_state iter_meta; +}; struct io_async_rw { size_t bytes_done; @@ -9,7 +15,14 @@ struct io_async_rw { struct iovec fast_iov; struct iovec *free_iovec; int free_iov_nr; - struct wait_page_queue wpq; + /* wpq is for buffered io, while meta fields are used with direct io*/ + union { + struct wait_page_queue wpq; + struct { + struct uio_meta meta; + struct io_meta_state meta_state; + }; + }; }; int io_prep_read_fixed(struct io_kiocb *req, const struct io_uring_sqe *sqe);