Cregit: Linux 6.15: notif.h

Contributors: 6
Author	Tokens	Token Proportion	Commits	Commit Proportion
Pavel Begunkov	167	71.98%	12	57.14%
Jens Axboe	49	21.12%	4	19.05%
Stefan Metzmacher	12	5.17%	2	9.52%
Linus Torvalds (pre-git)	2	0.86%	1	4.76%
Greg Kroah-Hartman	1	0.43%	1	4.76%
Arnaldo Carvalho de Melo	1	0.43%	1	4.76%
Total	232		21

// SPDX-License-Identifier: GPL-2.0

#include <linux/net.h>
#include <linux/uio.h>
#include <net/sock.h>
#include <linux/nospec.h>

#include "rsrc.h"

#define IO_NOTIF_UBUF_FLAGS	(SKBFL_ZEROCOPY_FRAG | SKBFL_DONT_ORPHAN)
#define IO_NOTIF_SPLICE_BATCH	32

struct io_notif_data {
	struct file		*file;
	struct ubuf_info	uarg;

	struct io_notif_data	*next;
	struct io_notif_data	*head;

	unsigned		account_pages;
	bool			zc_report;
	bool			zc_used;
	bool			zc_copied;
};

struct io_kiocb *io_alloc_notif(struct io_ring_ctx *ctx);
void io_tx_ubuf_complete(struct sk_buff *skb, struct ubuf_info *uarg,
			 bool success);

static inline struct io_notif_data *io_notif_to_data(struct io_kiocb *notif)
{
	return io_kiocb_to_cmd(notif, struct io_notif_data);
}

static inline void io_notif_flush(struct io_kiocb *notif)
	__must_hold(&notif->ctx->uring_lock)
{
	struct io_notif_data *nd = io_notif_to_data(notif);

	io_tx_ubuf_complete(NULL, &nd->uarg, true);
}

static inline int io_notif_account_mem(struct io_kiocb *notif, unsigned len)
{
	struct io_ring_ctx *ctx = notif->ctx;
	struct io_notif_data *nd = io_notif_to_data(notif);
	unsigned nr_pages = (len >> PAGE_SHIFT) + 2;
	int ret;

	if (ctx->user) {
		ret = __io_account_mem(ctx->user, nr_pages);
		if (ret)
			return ret;
		nd->account_pages += nr_pages;
	}
	return 0;
}