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https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 12:43:55 +08:00
io_uring: get rid of delayed mm check
Fail fast if can't grab mm, so past that requests always have an mm when required. This allows us to remove req->user altogether. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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4c46bef2e9
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@ -553,7 +553,6 @@ struct io_kiocb {
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* llist_node is only used for poll deferred completions
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*/
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struct llist_node llist_node;
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bool has_user;
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bool in_async;
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bool needs_fixed_file;
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u8 opcode;
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@ -2056,9 +2055,6 @@ static ssize_t io_import_iovec(int rw, struct io_kiocb *req,
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return iorw->size;
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}
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if (!req->has_user)
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return -EFAULT;
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#ifdef CONFIG_COMPAT
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if (req->ctx->compat)
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return compat_import_iovec(rw, buf, sqe_len, UIO_FASTIOV,
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@ -4446,7 +4442,6 @@ static void io_wq_submit_work(struct io_wq_work **workptr)
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}
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if (!ret) {
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req->has_user = (work->flags & IO_WQ_WORK_HAS_MM) != 0;
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req->in_async = true;
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do {
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ret = io_issue_sqe(req, NULL, &nxt, false);
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@ -4950,6 +4945,7 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
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for (i = 0; i < nr; i++) {
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const struct io_uring_sqe *sqe;
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struct io_kiocb *req;
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int err;
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req = io_get_req(ctx, statep);
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if (unlikely(!req)) {
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@ -4966,20 +4962,23 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr,
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submitted++;
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if (unlikely(req->opcode >= IORING_OP_LAST)) {
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io_cqring_add_event(req, -EINVAL);
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err = -EINVAL;
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fail_req:
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io_cqring_add_event(req, err);
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io_double_put_req(req);
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break;
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}
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if (io_op_defs[req->opcode].needs_mm && !*mm) {
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mm_fault = mm_fault || !mmget_not_zero(ctx->sqo_mm);
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if (!mm_fault) {
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use_mm(ctx->sqo_mm);
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*mm = ctx->sqo_mm;
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if (unlikely(mm_fault)) {
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err = -EFAULT;
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goto fail_req;
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}
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use_mm(ctx->sqo_mm);
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*mm = ctx->sqo_mm;
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}
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req->has_user = *mm != NULL;
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req->in_async = async;
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req->needs_fixed_file = async;
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trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data,
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