io_uring/advise.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/kernel.h>
   3 #include <linux/errno.h>
   4 #include <linux/fs.h>
   5 #include <linux/file.h>
   6 #include <linux/mm.h>
   7 #include <linux/slab.h>
   8 #include <linux/namei.h>
   9 #include <linux/io_uring.h>
  10
  11 #include <uapi/linux/fadvise.h>
  12 #include <uapi/linux/io_uring.h>
  13
  14 #include "io_uring.h"
  15 #include "advise.h"
  16
  17 struct io_fadvise {
  18         struct file                     *file;
  19         u64                             offset;
  20         u32                             len;
  21         u32                             advice;
  22 };
  23
  24 struct io_madvise {
  25         struct file                     *file;
  26         u64                             addr;
  27         u32                             len;
  28         u32                             advice;
  29 };
  30
  31 int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
  32 {
  33 #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
  34         struct io_madvise *ma = io_kiocb_to_cmd(req);
  35
  36         if (sqe->buf_index || sqe->off || sqe->splice_fd_in)
  37                 return -EINVAL;
  38
  39         ma->addr = READ_ONCE(sqe->addr);
  40         ma->len = READ_ONCE(sqe->len);
  41         ma->advice = READ_ONCE(sqe->fadvise_advice);
  42         return 0;
  43 #else
  44         return -EOPNOTSUPP;
  45 #endif
  46 }
  47
  48 int io_madvise(struct io_kiocb *req, unsigned int issue_flags)
  49 {
  50 #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
  51         struct io_madvise *ma = io_kiocb_to_cmd(req);
  52         int ret;
  53
  54         if (issue_flags & IO_URING_F_NONBLOCK)
  55                 return -EAGAIN;
  56
  57         ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice);
  58         io_req_set_res(req, ret, 0);
  59         return IOU_OK;
  60 #else
  61         return -EOPNOTSUPP;
  62 #endif
  63 }
  64
  65 int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
  66 {
  67         struct io_fadvise *fa = io_kiocb_to_cmd(req);
  68
  69         if (sqe->buf_index || sqe->addr || sqe->splice_fd_in)
  70                 return -EINVAL;
  71
  72         fa->offset = READ_ONCE(sqe->off);
  73         fa->len = READ_ONCE(sqe->len);
  74         fa->advice = READ_ONCE(sqe->fadvise_advice);
  75         return 0;
  76 }
  77
  78 int io_fadvise(struct io_kiocb *req, unsigned int issue_flags)
  79 {
  80         struct io_fadvise *fa = io_kiocb_to_cmd(req);
  81         int ret;
  82
  83         if (issue_flags & IO_URING_F_NONBLOCK) {
  84                 switch (fa->advice) {
  85                 case POSIX_FADV_NORMAL:
  86                 case POSIX_FADV_RANDOM:
  87                 case POSIX_FADV_SEQUENTIAL:
  88                         break;
  89                 default:
  90                         return -EAGAIN;
  91                 }
  92         }
  93
  94         ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice);
  95         if (ret < 0)
  96                 req_set_fail(req);
  97         io_req_set_res(req, ret, 0);
  98         return IOU_OK;
  99 }