io_uring/notif.h

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <linux/net.h>
   4 #include <linux/uio.h>
   5 #include <net/sock.h>
   6 #include <linux/nospec.h>
   7
   8 #include "rsrc.h"
   9
  10 #define IO_NOTIF_UBUF_FLAGS     (SKBFL_ZEROCOPY_FRAG | SKBFL_DONT_ORPHAN)
  11 #define IO_NOTIF_SPLICE_BATCH   32
  12
  13 struct io_notif_data {
  14         struct file             *file;
  15         struct ubuf_info        uarg;
  16
  17         struct io_notif_data    *next;
  18         struct io_notif_data    *head;
  19
  20         unsigned                account_pages;
  21         bool                    zc_report;
  22         bool                    zc_used;
  23         bool                    zc_copied;
  24 };
  25
  26 struct io_kiocb *io_alloc_notif(struct io_ring_ctx *ctx);
  27 void io_tx_ubuf_complete(struct sk_buff *skb, struct ubuf_info *uarg,
  28                          bool success);
  29
  30 static inline struct io_notif_data *io_notif_to_data(struct io_kiocb *notif)
  31 {
  32         return io_kiocb_to_cmd(notif, struct io_notif_data);
  33 }
  34
  35 static inline void io_notif_flush(struct io_kiocb *notif)
  36         __must_hold(&notif->ctx->uring_lock)
  37 {
  38         struct io_notif_data *nd = io_notif_to_data(notif);
  39
  40         io_tx_ubuf_complete(NULL, &nd->uarg, true);
  41 }
  42
  43 static inline int io_notif_account_mem(struct io_kiocb *notif, unsigned len)
  44 {
  45         struct io_ring_ctx *ctx = notif->ctx;
  46         struct io_notif_data *nd = io_notif_to_data(notif);
  47         unsigned nr_pages = (len >> PAGE_SHIFT) + 2;
  48         int ret;
  49
  50         if (ctx->user) {
  51                 ret = __io_account_mem(ctx->user, nr_pages);
  52                 if (ret)
  53                         return ret;
  54                 nd->account_pages += nr_pages;
  55         }
  56         return 0;
  57 }