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         unsigned long           account_pages;
  17         bool                    zc_report;
  18         bool                    zc_used;
  19         bool                    zc_copied;
  20 };
  21
  22 struct io_kiocb *io_alloc_notif(struct io_ring_ctx *ctx);
  23 void io_notif_set_extended(struct io_kiocb *notif);
  24
  25 static inline struct io_notif_data *io_notif_to_data(struct io_kiocb *notif)
  26 {
  27         return io_kiocb_to_cmd(notif, struct io_notif_data);
  28 }
  29
  30 static inline void io_notif_flush(struct io_kiocb *notif)
  31         __must_hold(&notif->ctx->uring_lock)
  32 {
  33         struct io_notif_data *nd = io_notif_to_data(notif);
  34
  35         /* drop slot's master ref */
  36         if (refcount_dec_and_test(&nd->uarg.refcnt))
  37                 __io_req_task_work_add(notif, IOU_F_TWQ_LAZY_WAKE);
  38 }
  39
  40 static inline int io_notif_account_mem(struct io_kiocb *notif, unsigned len)
  41 {
  42         struct io_ring_ctx *ctx = notif->ctx;
  43         struct io_notif_data *nd = io_notif_to_data(notif);
  44         unsigned nr_pages = (len >> PAGE_SHIFT) + 2;
  45         int ret;
  46
  47         if (ctx->user) {
  48                 ret = __io_account_mem(ctx->user, nr_pages);
  49                 if (ret)
  50                         return ret;
  51                 nd->account_pages += nr_pages;
  52         }
  53         return 0;
  54 }