diff options
author | Jens Axboe <axboe@kernel.dk> | 2022-06-13 15:57:44 +0300 |
---|---|---|
committer | Jens Axboe <axboe@kernel.dk> | 2022-07-25 03:39:10 +0300 |
commit | 3c306fb2f9463fd0e0e896dde9e3e53097d0e41e (patch) | |
tree | e50b299b4d3ba3ef07f65e5bdeda1faa10bd43b7 | |
parent | f49eca21563b6d919d49828aaed9eab5d8090361 (diff) | |
download | linux-3c306fb2f9463fd0e0e896dde9e3e53097d0e41e.tar.xz |
io_uring: convert read/write path to use io_cmd_type
Remove struct io_rw from io_kiocb, and convert the read/write path to
use the io_cmd_type approach instead.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r-- | io_uring/io_uring.c | 194 |
1 files changed, 106 insertions, 88 deletions
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index c596ffd92a0a..db2880ccb227 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -964,6 +964,7 @@ struct io_cmd_data { }; #define io_kiocb_to_cmd(req) ((void *) &(req)->cmd) +#define cmd_to_io_kiocb(ptr) ((struct io_kiocb *) ptr) struct io_kiocb { union { @@ -975,7 +976,6 @@ struct io_kiocb { */ struct file *file; struct io_cmd_data cmd; - struct io_rw rw; struct io_poll_iocb poll; struct io_poll_update poll_update; struct io_accept accept; @@ -3032,7 +3032,7 @@ static int io_do_iopoll(struct io_ring_ctx *ctx, bool force_nonspin) wq_list_for_each(pos, start, &ctx->iopoll_list) { struct io_kiocb *req = container_of(pos, struct io_kiocb, comp_list); - struct kiocb *kiocb = &req->rw.kiocb; + struct io_rw *rw = io_kiocb_to_cmd(req); int ret; /* @@ -3043,7 +3043,7 @@ static int io_do_iopoll(struct io_ring_ctx *ctx, bool force_nonspin) if (READ_ONCE(req->iopoll_completed)) break; - ret = kiocb->ki_filp->f_op->iopoll(kiocb, &iob, poll_flags); + ret = rw->kiocb.ki_filp->f_op->iopoll(&rw->kiocb, &iob, poll_flags); if (unlikely(ret < 0)) return ret; else if (ret) @@ -3188,11 +3188,11 @@ static void kiocb_end_write(struct io_kiocb *req) #ifdef CONFIG_BLOCK static bool io_resubmit_prep(struct io_kiocb *req) { - struct io_async_rw *rw = req->async_data; + struct io_async_rw *io = req->async_data; if (!req_has_async_data(req)) return !io_req_prep_async(req); - iov_iter_restore(&rw->s.iter, &rw->s.iter_state); + iov_iter_restore(&io->s.iter, &io->s.iter_state); return true; } @@ -3234,7 +3234,9 @@ static bool io_rw_should_reissue(struct io_kiocb *req) static bool __io_complete_rw_common(struct io_kiocb *req, long res) { - if (req->rw.kiocb.ki_flags & IOCB_WRITE) { + struct io_rw *rw = io_kiocb_to_cmd(req); + + if (rw->kiocb.ki_flags & IOCB_WRITE) { kiocb_end_write(req); fsnotify_modify(req->file); } else { @@ -3276,7 +3278,8 @@ static void __io_complete_rw(struct io_kiocb *req, long res, static void io_complete_rw(struct kiocb *kiocb, long res) { - struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); + struct io_rw *rw = container_of(kiocb, struct io_rw, kiocb); + struct io_kiocb *req = cmd_to_io_kiocb(rw); if (__io_complete_rw_common(req, res)) return; @@ -3287,7 +3290,8 @@ static void io_complete_rw(struct kiocb *kiocb, long res) static void io_complete_rw_iopoll(struct kiocb *kiocb, long res) { - struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb); + struct io_rw *rw = container_of(kiocb, struct io_rw, kiocb); + struct io_kiocb *req = cmd_to_io_kiocb(rw); if (kiocb->ki_flags & IOCB_WRITE) kiocb_end_write(req); @@ -3418,11 +3422,11 @@ static inline bool io_file_supports_nowait(struct io_kiocb *req) static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe) { - struct kiocb *kiocb = &req->rw.kiocb; + struct io_rw *rw = io_kiocb_to_cmd(req); unsigned ioprio; int ret; - kiocb->ki_pos = READ_ONCE(sqe->off); + rw->kiocb.ki_pos = READ_ONCE(sqe->off); /* used for fixed read/write too - just read unconditionally */ req->buf_index = READ_ONCE(sqe->buf_index); @@ -3444,14 +3448,14 @@ static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe) if (ret) return ret; - kiocb->ki_ioprio = ioprio; + rw->kiocb.ki_ioprio = ioprio; } else { - kiocb->ki_ioprio = get_current_ioprio(); + rw->kiocb.ki_ioprio = get_current_ioprio(); } - req->rw.addr = READ_ONCE(sqe->addr); - req->rw.len = READ_ONCE(sqe->len); - req->rw.flags = READ_ONCE(sqe->rw_flags); + rw->addr = READ_ONCE(sqe->addr); + rw->len = READ_ONCE(sqe->len); + rw->flags = READ_ONCE(sqe->rw_flags); return 0; } @@ -3478,18 +3482,18 @@ static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret) static inline loff_t *io_kiocb_update_pos(struct io_kiocb *req) { - struct kiocb *kiocb = &req->rw.kiocb; + struct io_rw *rw = io_kiocb_to_cmd(req); - if (kiocb->ki_pos != -1) - return &kiocb->ki_pos; + if (rw->kiocb.ki_pos != -1) + return &rw->kiocb.ki_pos; if (!(req->file->f_mode & FMODE_STREAM)) { req->flags |= REQ_F_CUR_POS; - kiocb->ki_pos = req->file->f_pos; - return &kiocb->ki_pos; + rw->kiocb.ki_pos = req->file->f_pos; + return &rw->kiocb.ki_pos; } - kiocb->ki_pos = 0; + rw->kiocb.ki_pos = 0; return NULL; } @@ -3497,6 +3501,7 @@ static void kiocb_done(struct io_kiocb *req, ssize_t ret, unsigned int issue_flags) { struct io_async_rw *io = req->async_data; + struct io_rw *rw = io_kiocb_to_cmd(req); /* add previously done IO, if any */ if (req_has_async_data(req) && io->bytes_done > 0) { @@ -3507,11 +3512,11 @@ static void kiocb_done(struct io_kiocb *req, ssize_t ret, } if (req->flags & REQ_F_CUR_POS) - req->file->f_pos = req->rw.kiocb.ki_pos; - if (ret >= 0 && (req->rw.kiocb.ki_complete == io_complete_rw)) + req->file->f_pos = rw->kiocb.ki_pos; + if (ret >= 0 && (rw->kiocb.ki_complete == io_complete_rw)) __io_complete_rw(req, ret, issue_flags); else - io_rw_done(&req->rw.kiocb, ret); + io_rw_done(&rw->kiocb, ret); if (req->flags & REQ_F_REISSUE) { req->flags &= ~REQ_F_REISSUE; @@ -3522,11 +3527,12 @@ static void kiocb_done(struct io_kiocb *req, ssize_t ret, } } -static int __io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter, - struct io_mapped_ubuf *imu) +static int __io_import_fixed(struct io_kiocb *req, int ddir, + struct iov_iter *iter, struct io_mapped_ubuf *imu) { - size_t len = req->rw.len; - u64 buf_end, buf_addr = req->rw.addr; + struct io_rw *rw = io_kiocb_to_cmd(req); + size_t len = rw->len; + u64 buf_end, buf_addr = rw->addr; size_t offset; if (unlikely(check_add_overflow(buf_addr, (u64)len, &buf_end))) @@ -3540,7 +3546,7 @@ static int __io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter * and advance us to the beginning. */ offset = buf_addr - imu->ubuf; - iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len); + iov_iter_bvec(iter, ddir, imu->bvec, imu->nr_bvecs, offset + len); if (offset) { /* @@ -3682,12 +3688,13 @@ static void __user *io_buffer_select(struct io_kiocb *req, size_t *len, static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, unsigned int issue_flags) { + struct io_rw *rw = io_kiocb_to_cmd(req); struct compat_iovec __user *uiov; compat_ssize_t clen; void __user *buf; size_t len; - uiov = u64_to_user_ptr(req->rw.addr); + uiov = u64_to_user_ptr(rw->addr); if (!access_ok(uiov, sizeof(*uiov))) return -EFAULT; if (__get_user(clen, &uiov->iov_len)) @@ -3699,9 +3706,9 @@ static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, buf = io_buffer_select(req, &len, issue_flags); if (!buf) return -ENOBUFS; - req->rw.addr = (unsigned long) buf; + rw->addr = (unsigned long) buf; iov[0].iov_base = buf; - req->rw.len = iov[0].iov_len = (compat_size_t) len; + rw->len = iov[0].iov_len = (compat_size_t) len; return 0; } #endif @@ -3709,7 +3716,8 @@ static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov, static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, unsigned int issue_flags) { - struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr); + struct io_rw *rw = io_kiocb_to_cmd(req); + struct iovec __user *uiov = u64_to_user_ptr(rw->addr); void __user *buf; ssize_t len; @@ -3722,21 +3730,23 @@ static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, buf = io_buffer_select(req, &len, issue_flags); if (!buf) return -ENOBUFS; - req->rw.addr = (unsigned long) buf; + rw->addr = (unsigned long) buf; iov[0].iov_base = buf; - req->rw.len = iov[0].iov_len = len; + rw->len = iov[0].iov_len = len; return 0; } static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov, unsigned int issue_flags) { + struct io_rw *rw = io_kiocb_to_cmd(req); + if (req->flags & (REQ_F_BUFFER_SELECTED|REQ_F_BUFFER_RING)) { - iov[0].iov_base = u64_to_user_ptr(req->rw.addr); - iov[0].iov_len = req->rw.len; + iov[0].iov_base = u64_to_user_ptr(rw->addr); + iov[0].iov_len = rw->len; return 0; } - if (req->rw.len != 1) + if (rw->len != 1) return -EINVAL; #ifdef CONFIG_COMPAT @@ -3754,10 +3764,11 @@ static inline bool io_do_buffer_select(struct io_kiocb *req) return !(req->flags & (REQ_F_BUFFER_SELECTED|REQ_F_BUFFER_RING)); } -static struct iovec *__io_import_iovec(int rw, struct io_kiocb *req, +static struct iovec *__io_import_iovec(int ddir, struct io_kiocb *req, struct io_rw_state *s, unsigned int issue_flags) { + struct io_rw *rw = io_kiocb_to_cmd(req); struct iov_iter *iter = &s->iter; u8 opcode = req->opcode; struct iovec *iovec; @@ -3766,25 +3777,25 @@ static struct iovec *__io_import_iovec(int rw, struct io_kiocb *req, ssize_t ret; if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) { - ret = io_import_fixed(req, rw, iter, issue_flags); + ret = io_import_fixed(req, ddir, iter, issue_flags); if (ret) return ERR_PTR(ret); return NULL; } - buf = u64_to_user_ptr(req->rw.addr); - sqe_len = req->rw.len; + buf = u64_to_user_ptr(rw->addr); + sqe_len = rw->len; if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) { if (io_do_buffer_select(req)) { buf = io_buffer_select(req, &sqe_len, issue_flags); if (!buf) return ERR_PTR(-ENOBUFS); - req->rw.addr = (unsigned long) buf; - req->rw.len = sqe_len; + rw->addr = (unsigned long) buf; + rw->len = sqe_len; } - ret = import_single_range(rw, buf, sqe_len, s->fast_iov, iter); + ret = import_single_range(ddir, buf, sqe_len, s->fast_iov, iter); if (ret) return ERR_PTR(ret); return NULL; @@ -3795,11 +3806,11 @@ static struct iovec *__io_import_iovec(int rw, struct io_kiocb *req, ret = io_iov_buffer_select(req, iovec, issue_flags); if (ret) return ERR_PTR(ret); - iov_iter_init(iter, rw, iovec, 1, iovec->iov_len); + iov_iter_init(iter, ddir, iovec, 1, iovec->iov_len); return NULL; } - ret = __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, &iovec, iter, + ret = __import_iovec(ddir, buf, sqe_len, UIO_FASTIOV, &iovec, iter, req->ctx->compat); if (unlikely(ret < 0)) return ERR_PTR(ret); @@ -3827,10 +3838,10 @@ static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb) * For files that don't have ->read_iter() and ->write_iter(), handle them * by looping over ->read() or ->write() manually. */ -static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) +static ssize_t loop_rw_iter(int ddir, struct io_rw *rw, struct iov_iter *iter) { - struct kiocb *kiocb = &req->rw.kiocb; - struct file *file = req->file; + struct kiocb *kiocb = &rw->kiocb; + struct file *file = kiocb->ki_filp; ssize_t ret = 0; loff_t *ppos; @@ -3854,11 +3865,11 @@ static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) if (!iov_iter_is_bvec(iter)) { iovec = iov_iter_iovec(iter); } else { - iovec.iov_base = u64_to_user_ptr(req->rw.addr); - iovec.iov_len = req->rw.len; + iovec.iov_base = u64_to_user_ptr(rw->addr); + iovec.iov_len = rw->len; } - if (rw == READ) { + if (ddir == READ) { nr = file->f_op->read(file, iovec.iov_base, iovec.iov_len, ppos); } else { @@ -3875,9 +3886,9 @@ static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) if (!iov_iter_is_bvec(iter)) { iov_iter_advance(iter, nr); } else { - req->rw.addr += nr; - req->rw.len -= nr; - if (!req->rw.len) + rw->addr += nr; + rw->len -= nr; + if (!rw->len) break; } if (nr != iovec.iov_len) @@ -3890,24 +3901,24 @@ static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter) static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec, const struct iovec *fast_iov, struct iov_iter *iter) { - struct io_async_rw *rw = req->async_data; + struct io_async_rw *io = req->async_data; - memcpy(&rw->s.iter, iter, sizeof(*iter)); - rw->free_iovec = iovec; - rw->bytes_done = 0; + memcpy(&io->s.iter, iter, sizeof(*iter)); + io->free_iovec = iovec; + io->bytes_done = 0; /* can only be fixed buffers, no need to do anything */ if (iov_iter_is_bvec(iter)) return; if (!iovec) { unsigned iov_off = 0; - rw->s.iter.iov = rw->s.fast_iov; + io->s.iter.iov = io->s.fast_iov; if (iter->iov != fast_iov) { iov_off = iter->iov - fast_iov; - rw->s.iter.iov += iov_off; + io->s.iter.iov += iov_off; } - if (rw->s.fast_iov != fast_iov) - memcpy(rw->s.fast_iov + iov_off, fast_iov + iov_off, + if (io->s.fast_iov != fast_iov) + memcpy(io->s.fast_iov + iov_off, fast_iov + iov_off, sizeof(struct iovec) * iter->nr_segs); } else { req->flags |= REQ_F_NEED_CLEANUP; @@ -3989,6 +4000,7 @@ static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, { struct wait_page_queue *wpq; struct io_kiocb *req = wait->private; + struct io_rw *rw = io_kiocb_to_cmd(req); struct wait_page_key *key = arg; wpq = container_of(wait, struct wait_page_queue, wait); @@ -3996,7 +4008,7 @@ static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, if (!wake_page_match(wpq, key)) return 0; - req->rw.kiocb.ki_flags &= ~IOCB_WAITQ; + rw->kiocb.ki_flags &= ~IOCB_WAITQ; list_del_init(&wait->entry); io_req_task_queue(req); return 1; @@ -4016,9 +4028,10 @@ static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode, */ static bool io_rw_should_retry(struct io_kiocb *req) { - struct io_async_rw *rw = req->async_data; - struct wait_page_queue *wait = &rw->wpq; - struct kiocb *kiocb = &req->rw.kiocb; + struct io_async_rw *io = req->async_data; + struct wait_page_queue *wait = &io->wpq; + struct io_rw *rw = io_kiocb_to_cmd(req); + struct kiocb *kiocb = &rw->kiocb; /* never retry for NOWAIT, we just complete with -EAGAIN */ if (req->flags & REQ_F_NOWAIT) @@ -4045,12 +4058,14 @@ static bool io_rw_should_retry(struct io_kiocb *req) return true; } -static inline int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter) +static inline int io_iter_do_read(struct io_rw *rw, struct iov_iter *iter) { - if (likely(req->file->f_op->read_iter)) - return call_read_iter(req->file, &req->rw.kiocb, iter); - else if (req->file->f_op->read) - return loop_rw_iter(READ, req, iter); + struct file *file = rw->kiocb.ki_filp; + + if (likely(file->f_op->read_iter)) + return call_read_iter(file, &rw->kiocb, iter); + else if (file->f_op->read) + return loop_rw_iter(READ, rw, iter); else return -EINVAL; } @@ -4063,7 +4078,8 @@ static bool need_read_all(struct io_kiocb *req) static int io_rw_init_file(struct io_kiocb *req, fmode_t mode) { - struct kiocb *kiocb = &req->rw.kiocb; + struct io_rw *rw = io_kiocb_to_cmd(req); + struct kiocb *kiocb = &rw->kiocb; struct io_ring_ctx *ctx = req->ctx; struct file *file = req->file; int ret; @@ -4075,7 +4091,7 @@ static int io_rw_init_file(struct io_kiocb *req, fmode_t mode) req->flags |= io_file_get_flags(file) << REQ_F_SUPPORT_NOWAIT_BIT; kiocb->ki_flags = iocb_flags(file); - ret = kiocb_set_rw_flags(kiocb, req->rw.flags); + ret = kiocb_set_rw_flags(kiocb, rw->flags); if (unlikely(ret)) return ret; @@ -4107,11 +4123,12 @@ static int io_rw_init_file(struct io_kiocb *req, fmode_t mode) static int io_read(struct io_kiocb *req, unsigned int issue_flags) { + struct io_rw *rw = io_kiocb_to_cmd(req); struct io_rw_state __s, *s = &__s; struct iovec *iovec; - struct kiocb *kiocb = &req->rw.kiocb; + struct kiocb *kiocb = &rw->kiocb; bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; - struct io_async_rw *rw; + struct io_async_rw *io; ssize_t ret, ret2; loff_t *ppos; @@ -4120,8 +4137,8 @@ static int io_read(struct io_kiocb *req, unsigned int issue_flags) if (unlikely(ret < 0)) return ret; } else { - rw = req->async_data; - s = &rw->s; + io = req->async_data; + s = &io->s; /* * Safe and required to re-import if we're using provided @@ -4168,7 +4185,7 @@ static int io_read(struct io_kiocb *req, unsigned int issue_flags) return ret; } - ret = io_iter_do_read(req, &s->iter); + ret = io_iter_do_read(rw, &s->iter); if (ret == -EAGAIN || (req->flags & REQ_F_REISSUE)) { req->flags &= ~REQ_F_REISSUE; @@ -4202,8 +4219,8 @@ static int io_read(struct io_kiocb *req, unsigned int issue_flags) return ret2; iovec = NULL; - rw = req->async_data; - s = &rw->s; + io = req->async_data; + s = &io->s; /* * Now use our persistent iterator and state, if we aren't already. * We've restored and mapped the iter to match. @@ -4218,7 +4235,7 @@ static int io_read(struct io_kiocb *req, unsigned int issue_flags) iov_iter_advance(&s->iter, ret); if (!iov_iter_count(&s->iter)) break; - rw->bytes_done += ret; + io->bytes_done += ret; iov_iter_save_state(&s->iter, &s->iter_state); /* if we can retry, do so with the callbacks armed */ @@ -4233,7 +4250,7 @@ static int io_read(struct io_kiocb *req, unsigned int issue_flags) * desired page gets unlocked. We can also get a partial read * here, and if we do, then just retry at the new offset. */ - ret = io_iter_do_read(req, &s->iter); + ret = io_iter_do_read(rw, &s->iter); if (ret == -EIOCBQUEUED) return 0; /* we got some bytes, but not all. retry. */ @@ -4251,9 +4268,10 @@ out_free: static int io_write(struct io_kiocb *req, unsigned int issue_flags) { + struct io_rw *rw = io_kiocb_to_cmd(req); struct io_rw_state __s, *s = &__s; struct iovec *iovec; - struct kiocb *kiocb = &req->rw.kiocb; + struct kiocb *kiocb = &rw->kiocb; bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; ssize_t ret, ret2; loff_t *ppos; @@ -4263,9 +4281,9 @@ static int io_write(struct io_kiocb *req, unsigned int issue_flags) if (unlikely(ret < 0)) return ret; } else { - struct io_async_rw *rw = req->async_data; + struct io_async_rw *io = req->async_data; - s = &rw->s; + s = &io->s; iov_iter_restore(&s->iter, &s->iter_state); iovec = NULL; } @@ -4315,7 +4333,7 @@ static int io_write(struct io_kiocb *req, unsigned int issue_flags) if (likely(req->file->f_op->write_iter)) ret2 = call_write_iter(req->file, kiocb, &s->iter); else if (req->file->f_op->write) - ret2 = loop_rw_iter(WRITE, req, &s->iter); + ret2 = loop_rw_iter(WRITE, rw, &s->iter); else ret2 = -EINVAL; |