65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/net.h>
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#include <linux/uio.h>
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#include <net/sock.h>
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#include <linux/nospec.h>
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struct io_notif {
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struct ubuf_info uarg;
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struct io_ring_ctx *ctx;
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/* cqe->user_data, io_notif_slot::tag if not overridden */
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u64 tag;
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/* see struct io_notif_slot::seq */
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u32 seq;
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union {
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struct callback_head task_work;
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struct work_struct commit_work;
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};
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};
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struct io_notif_slot {
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/*
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* Current/active notifier. A slot holds only one active notifier at a
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* time and keeps one reference to it. Flush releases the reference and
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* lazily replaces it with a new notifier.
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*/
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struct io_notif *notif;
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/*
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* Default ->user_data for this slot notifiers CQEs
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*/
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u64 tag;
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/*
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* Notifiers of a slot live in generations, we create a new notifier
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* only after flushing the previous one. Track the sequential number
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* for all notifiers and copy it into notifiers's cqe->cflags
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*/
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u32 seq;
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};
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int io_notif_unregister(struct io_ring_ctx *ctx);
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struct io_notif *io_alloc_notif(struct io_ring_ctx *ctx,
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struct io_notif_slot *slot);
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static inline struct io_notif *io_get_notif(struct io_ring_ctx *ctx,
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struct io_notif_slot *slot)
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{
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if (!slot->notif)
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slot->notif = io_alloc_notif(ctx, slot);
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return slot->notif;
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}
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static inline struct io_notif_slot *io_get_notif_slot(struct io_ring_ctx *ctx,
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int idx)
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__must_hold(&ctx->uring_lock)
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{
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if (idx >= ctx->nr_notif_slots)
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return NULL;
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idx = array_index_nospec(idx, ctx->nr_notif_slots);
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return &ctx->notif_slots[idx];
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}
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