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         u64                             len;
  21         u32                             advice;
  22 };
  23
  24 struct io_madvise {
  25         struct file                     *file;
  26         u64                             addr;
  27         u64                             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, struct io_madvise);
  35
  36         if (sqe->buf_index || sqe->splice_fd_in)
  37                 return -EINVAL;
  38
  39         ma->addr = READ_ONCE(sqe->addr);
  40         ma->len = READ_ONCE(sqe->off);
  41         if (!ma->len)
  42                 ma->len = READ_ONCE(sqe->len);
  43         ma->advice = READ_ONCE(sqe->fadvise_advice);
  44         req->flags |= REQ_F_FORCE_ASYNC;
  45         return 0;
  46 #else
  47         return -EOPNOTSUPP;
  48 #endif
  49 }
  50
  51 int io_madvise(struct io_kiocb *req, unsigned int issue_flags)
  52 {
  53 #if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
  54         struct io_madvise *ma = io_kiocb_to_cmd(req, struct io_madvise);
  55         int ret;
  56
  57         WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
  58
  59         ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice);
  60         io_req_set_res(req, ret, 0);
  61         return IOU_OK;
  62 #else
  63         return -EOPNOTSUPP;
  64 #endif
  65 }
  66
  67 static bool io_fadvise_force_async(struct io_fadvise *fa)
  68 {
  69         switch (fa->advice) {
  70         case POSIX_FADV_NORMAL:
  71         case POSIX_FADV_RANDOM:
  72         case POSIX_FADV_SEQUENTIAL:
  73                 return false;
  74         default:
  75                 return true;
  76         }
  77 }
  78
  79 int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
  80 {
  81         struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise);
  82
  83         if (sqe->buf_index || sqe->splice_fd_in)
  84                 return -EINVAL;
  85
  86         fa->offset = READ_ONCE(sqe->off);
  87         fa->len = READ_ONCE(sqe->addr);
  88         if (!fa->len)
  89                 fa->len = READ_ONCE(sqe->len);
  90         fa->advice = READ_ONCE(sqe->fadvise_advice);
  91         if (io_fadvise_force_async(fa))
  92                 req->flags |= REQ_F_FORCE_ASYNC;
  93         return 0;
  94 }
  95
  96 int io_fadvise(struct io_kiocb *req, unsigned int issue_flags)
  97 {
  98         struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise);
  99         int ret;
 100
 101         WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK && io_fadvise_force_async(fa));
 102
 103         ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice);
 104         if (ret < 0)
 105                 req_set_fail(req);
 106         io_req_set_res(req, ret, 0);
 107         return IOU_OK;
 108 }