io_uring/statx.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/kernel.h>
   3 #include <linux/errno.h>
   4 #include <linux/file.h>
   5 #include <linux/io_uring.h>
   6
   7 #include <uapi/linux/io_uring.h>
   8
   9 #include "../fs/internal.h"
  10
  11 #include "io_uring.h"
  12 #include "statx.h"
  13
  14 struct io_statx {
  15         struct file                     *file;
  16         int                             dfd;
  17         unsigned int                    mask;
  18         unsigned int                    flags;
  19         struct filename                 *filename;
  20         struct statx __user             *buffer;
  21 };
  22
  23 int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
  24 {
  25         struct io_statx *sx = io_kiocb_to_cmd(req, struct io_statx);
  26         const char __user *path;
  27
  28         if (sqe->buf_index || sqe->splice_fd_in)
  29                 return -EINVAL;
  30         if (req->flags & REQ_F_FIXED_FILE)
  31                 return -EBADF;
  32
  33         sx->dfd = READ_ONCE(sqe->fd);
  34         sx->mask = READ_ONCE(sqe->len);
  35         path = u64_to_user_ptr(READ_ONCE(sqe->addr));
  36         sx->buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2));
  37         sx->flags = READ_ONCE(sqe->statx_flags);
  38
  39         sx->filename = getname_flags(path,
  40                                      getname_statx_lookup_flags(sx->flags),
  41                                      NULL);
  42
  43         if (IS_ERR(sx->filename)) {
  44                 int ret = PTR_ERR(sx->filename);
  45
  46                 sx->filename = NULL;
  47                 return ret;
  48         }
  49
  50         req->flags |= REQ_F_NEED_CLEANUP;
  51         return 0;
  52 }
  53
  54 int io_statx(struct io_kiocb *req, unsigned int issue_flags)
  55 {
  56         struct io_statx *sx = io_kiocb_to_cmd(req, struct io_statx);
  57         int ret;
  58
  59         if (issue_flags & IO_URING_F_NONBLOCK)
  60                 return -EAGAIN;
  61
  62         ret = do_statx(sx->dfd, sx->filename, sx->flags, sx->mask, sx->buffer);
  63         io_req_set_res(req, ret, 0);
  64         return IOU_OK;
  65 }
  66
  67 void io_statx_cleanup(struct io_kiocb *req)
  68 {
  69         struct io_statx *sx = io_kiocb_to_cmd(req, struct io_statx);
  70
  71         if (sx->filename)
  72                 putname(sx->filename);
  73 }