io_uring/notif: remove notif registration
We're going to remove the userspace exposed zerocopy notification API, remove notification registration. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/6ff00b97be99869c386958a990593c9c31cf105b.1662027856.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -279,14 +279,10 @@ enum io_uring_op {
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*
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* IORING_RECVSEND_FIXED_BUF Use registered buffers, the index is stored in
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* the buf_index field.
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*
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* IORING_RECVSEND_NOTIF_FLUSH Flush a notification after a successful
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* successful. Only for zerocopy sends.
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*/
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#define IORING_RECVSEND_POLL_FIRST (1U << 0)
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#define IORING_RECV_MULTISHOT (1U << 1)
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#define IORING_RECVSEND_FIXED_BUF (1U << 2)
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#define IORING_RECVSEND_NOTIF_FLUSH (1U << 3)
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/*
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* accept flags stored in sqe->ioprio
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@ -474,10 +470,6 @@ enum {
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/* register a range of fixed file slots for automatic slot allocation */
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IORING_REGISTER_FILE_ALLOC_RANGE = 25,
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/* zerocopy notification API */
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IORING_REGISTER_NOTIFIERS = 26,
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IORING_UNREGISTER_NOTIFIERS = 27,
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/* this goes last */
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IORING_REGISTER_LAST
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};
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@ -2640,7 +2640,6 @@ static __cold void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx)
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io_unregister_personality(ctx, index);
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if (ctx->rings)
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io_poll_remove_all(ctx, NULL, true);
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io_notif_unregister(ctx);
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mutex_unlock(&ctx->uring_lock);
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/* failed during ring init, it couldn't have issued any requests */
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@ -3839,15 +3838,6 @@ static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
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break;
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ret = io_register_file_alloc_range(ctx, arg);
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break;
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case IORING_REGISTER_NOTIFIERS:
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ret = io_notif_register(ctx, arg, nr_args);
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break;
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case IORING_UNREGISTER_NOTIFIERS:
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ret = -EINVAL;
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if (arg || nr_args)
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break;
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ret = io_notif_unregister(ctx);
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break;
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default:
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ret = -EINVAL;
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break;
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@ -889,7 +889,7 @@ int io_sendzc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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zc->flags = READ_ONCE(sqe->ioprio);
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if (zc->flags & ~(IORING_RECVSEND_POLL_FIRST |
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IORING_RECVSEND_FIXED_BUF | IORING_RECVSEND_NOTIF_FLUSH))
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IORING_RECVSEND_FIXED_BUF))
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return -EINVAL;
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if (zc->flags & IORING_RECVSEND_FIXED_BUF) {
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unsigned idx = READ_ONCE(sqe->buf_index);
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@ -1063,8 +1063,6 @@ int io_sendzc(struct io_kiocb *req, unsigned int issue_flags)
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if (ret == -ERESTARTSYS)
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ret = -EINTR;
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req_set_fail(req);
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} else if (zc->flags & IORING_RECVSEND_NOTIF_FLUSH) {
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io_notif_slot_flush_submit(notif_slot, 0);
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}
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if (ret >= 0)
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@ -86,74 +86,3 @@ void io_notif_slot_flush(struct io_notif_slot *slot)
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io_req_task_work_add(notif);
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}
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}
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__cold int io_notif_unregister(struct io_ring_ctx *ctx)
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__must_hold(&ctx->uring_lock)
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{
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int i;
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if (!ctx->notif_slots)
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return -ENXIO;
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for (i = 0; i < ctx->nr_notif_slots; i++) {
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struct io_notif_slot *slot = &ctx->notif_slots[i];
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struct io_kiocb *notif = slot->notif;
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struct io_notif_data *nd;
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if (!notif)
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continue;
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nd = io_notif_to_data(notif);
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slot->notif = NULL;
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if (!refcount_dec_and_test(&nd->uarg.refcnt))
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continue;
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notif->io_task_work.func = __io_notif_complete_tw;
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io_req_task_work_add(notif);
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}
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kvfree(ctx->notif_slots);
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ctx->notif_slots = NULL;
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ctx->nr_notif_slots = 0;
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return 0;
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}
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__cold int io_notif_register(struct io_ring_ctx *ctx,
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void __user *arg, unsigned int size)
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__must_hold(&ctx->uring_lock)
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{
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struct io_uring_notification_slot __user *slots;
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struct io_uring_notification_slot slot;
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struct io_uring_notification_register reg;
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unsigned i;
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if (ctx->nr_notif_slots)
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return -EBUSY;
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if (size != sizeof(reg))
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return -EINVAL;
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if (copy_from_user(®, arg, sizeof(reg)))
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return -EFAULT;
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if (!reg.nr_slots || reg.nr_slots > IORING_MAX_NOTIF_SLOTS)
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return -EINVAL;
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if (reg.resv || reg.resv2 || reg.resv3)
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return -EINVAL;
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slots = u64_to_user_ptr(reg.data);
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ctx->notif_slots = kvcalloc(reg.nr_slots, sizeof(ctx->notif_slots[0]),
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GFP_KERNEL_ACCOUNT);
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if (!ctx->notif_slots)
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return -ENOMEM;
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for (i = 0; i < reg.nr_slots; i++, ctx->nr_notif_slots++) {
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struct io_notif_slot *notif_slot = &ctx->notif_slots[i];
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if (copy_from_user(&slot, &slots[i], sizeof(slot))) {
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io_notif_unregister(ctx);
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return -EFAULT;
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}
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if (slot.resv[0] | slot.resv[1] | slot.resv[2]) {
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io_notif_unregister(ctx);
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return -EINVAL;
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}
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notif_slot->tag = slot.tag;
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}
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return 0;
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}
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@ -8,7 +8,6 @@
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#include "rsrc.h"
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#define IO_NOTIF_SPLICE_BATCH 32
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#define IORING_MAX_NOTIF_SLOTS (1U << 15)
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struct io_notif_data {
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struct file *file;
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@ -36,10 +35,6 @@ struct io_notif_slot {
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u32 seq;
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};
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int io_notif_register(struct io_ring_ctx *ctx,
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void __user *arg, unsigned int size);
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int io_notif_unregister(struct io_ring_ctx *ctx);
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void io_notif_slot_flush(struct io_notif_slot *slot);
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struct io_kiocb *io_alloc_notif(struct io_ring_ctx *ctx,
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struct io_notif_slot *slot);
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@ -67,12 +62,6 @@ static inline struct io_notif_slot *io_get_notif_slot(struct io_ring_ctx *ctx,
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return &ctx->notif_slots[idx];
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}
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static inline void io_notif_slot_flush_submit(struct io_notif_slot *slot,
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unsigned int issue_flags)
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{
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io_notif_slot_flush(slot);
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}
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static inline int io_notif_account_mem(struct io_kiocb *notif, unsigned len)
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{
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struct io_ring_ctx *ctx = notif->ctx;
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