diff options
Diffstat (limited to 'io_uring/uring_cmd.c')
| -rw-r--r-- | io_uring/uring_cmd.c | 122 |
1 files changed, 99 insertions, 23 deletions
diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c index 42f63adfa5..a54163a839 100644 --- a/io_uring/uring_cmd.c +++ b/io_uring/uring_cmd.c @@ -3,6 +3,7 @@ #include <linux/errno.h> #include <linux/file.h> #include <linux/io_uring/cmd.h> +#include <linux/io_uring/net.h> #include <linux/security.h> #include <linux/nospec.h> #include <net/sock.h> @@ -11,9 +12,71 @@ #include <asm/ioctls.h> #include "io_uring.h" +#include "alloc_cache.h" #include "rsrc.h" #include "uring_cmd.h" +static struct uring_cache *io_uring_async_get(struct io_kiocb *req) +{ + struct io_ring_ctx *ctx = req->ctx; + struct uring_cache *cache; + + cache = io_alloc_cache_get(&ctx->uring_cache); + if (cache) { + req->flags |= REQ_F_ASYNC_DATA; + req->async_data = cache; + return cache; + } + if (!io_alloc_async_data(req)) + return req->async_data; + return NULL; +} + +static void io_req_uring_cleanup(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd); + struct uring_cache *cache = req->async_data; + + if (issue_flags & IO_URING_F_UNLOCKED) + return; + if (io_alloc_cache_put(&req->ctx->uring_cache, cache)) { + ioucmd->sqe = NULL; + req->async_data = NULL; + req->flags &= ~REQ_F_ASYNC_DATA; + } +} + +bool io_uring_try_cancel_uring_cmd(struct io_ring_ctx *ctx, + struct task_struct *task, bool cancel_all) +{ + struct hlist_node *tmp; + struct io_kiocb *req; + bool ret = false; + + lockdep_assert_held(&ctx->uring_lock); + + hlist_for_each_entry_safe(req, tmp, &ctx->cancelable_uring_cmd, + hash_node) { + struct io_uring_cmd *cmd = io_kiocb_to_cmd(req, + struct io_uring_cmd); + struct file *file = req->file; + + if (!cancel_all && req->task != task) + continue; + + if (cmd->flags & IORING_URING_CMD_CANCELABLE) { + /* ->sqe isn't available if no async data */ + if (!req_has_async_data(req)) + cmd->sqe = NULL; + file->f_op->uring_cmd(cmd, IO_URING_F_CANCEL | + IO_URING_F_COMPLETE_DEFER); + ret = true; + } + } + io_submit_flush_completions(ctx); + return ret; +} + static void io_uring_cmd_del_cancelable(struct io_uring_cmd *cmd, unsigned int issue_flags) { @@ -56,9 +119,9 @@ EXPORT_SYMBOL_GPL(io_uring_cmd_mark_cancelable); static void io_uring_cmd_work(struct io_kiocb *req, struct io_tw_state *ts) { struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd); - unsigned issue_flags = ts->locked ? 0 : IO_URING_F_UNLOCKED; - ioucmd->task_work_cb(ioucmd, issue_flags); + /* task_work executor checks the deffered list completion */ + ioucmd->task_work_cb(ioucmd, IO_URING_F_COMPLETE_DEFER); } void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd, @@ -97,23 +160,38 @@ void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2, io_req_set_res(req, ret, 0); if (req->ctx->flags & IORING_SETUP_CQE32) io_req_set_cqe32_extra(req, res2, 0); + io_req_uring_cleanup(req, issue_flags); if (req->ctx->flags & IORING_SETUP_IOPOLL) { /* order with io_iopoll_req_issued() checking ->iopoll_complete */ smp_store_release(&req->iopoll_completed, 1); + } else if (issue_flags & IO_URING_F_COMPLETE_DEFER) { + if (WARN_ON_ONCE(issue_flags & IO_URING_F_UNLOCKED)) + return; + io_req_complete_defer(req); } else { - struct io_tw_state ts = { - .locked = !(issue_flags & IO_URING_F_UNLOCKED), - }; - io_req_task_complete(req, &ts); + req->io_task_work.func = io_req_task_complete; + io_req_task_work_add(req); } } EXPORT_SYMBOL_GPL(io_uring_cmd_done); -int io_uring_cmd_prep_async(struct io_kiocb *req) +static int io_uring_cmd_prep_setup(struct io_kiocb *req, + const struct io_uring_sqe *sqe) { struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd); + struct uring_cache *cache; + + cache = io_uring_async_get(req); + if (unlikely(!cache)) + return -ENOMEM; + + if (!(req->flags & REQ_F_FORCE_ASYNC)) { + /* defer memcpy until we need it */ + ioucmd->sqe = sqe; + return 0; + } - memcpy(req->async_data, ioucmd->sqe, uring_sqe_size(req->ctx)); + memcpy(req->async_data, sqe, uring_sqe_size(req->ctx)); ioucmd->sqe = req->async_data; return 0; } @@ -140,9 +218,9 @@ int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) req->imu = ctx->user_bufs[index]; io_req_set_rsrc_node(req, ctx, 0); } - ioucmd->sqe = sqe; ioucmd->cmd_op = READ_ONCE(sqe->cmd_op); - return 0; + + return io_uring_cmd_prep_setup(req, sqe); } int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags) @@ -174,22 +252,20 @@ int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags) ret = file->f_op->uring_cmd(ioucmd, issue_flags); if (ret == -EAGAIN) { - if (!req_has_async_data(req)) { - if (io_alloc_async_data(req)) - return -ENOMEM; - io_uring_cmd_prep_async(req); - } - return -EAGAIN; - } + struct uring_cache *cache = req->async_data; - if (ret != -EIOCBQUEUED) { - if (ret < 0) - req_set_fail(req); - io_req_set_res(req, ret, 0); - return ret; + if (ioucmd->sqe != (void *) cache) + memcpy(cache, ioucmd->sqe, uring_sqe_size(req->ctx)); + return -EAGAIN; + } else if (ret == -EIOCBQUEUED) { + return -EIOCBQUEUED; } - return IOU_ISSUE_SKIP_COMPLETE; + if (ret < 0) + req_set_fail(req); + io_req_uring_cleanup(req, issue_flags); + io_req_set_res(req, ret, 0); + return ret < 0 ? ret : IOU_OK; } int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw, |