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_uflags(path, sx->flags);
  40
  41         if (IS_ERR(sx->filename)) {
  42                 int ret = PTR_ERR(sx->filename);
  43
  44                 sx->filename = NULL;
  45                 return ret;
  46         }
  47
  48         req->flags |= REQ_F_NEED_CLEANUP;
  49         req->flags |= REQ_F_FORCE_ASYNC;
  50         return 0;
  51 }
  52
  53 int io_statx(struct io_kiocb *req, unsigned int issue_flags)
  54 {
  55         struct io_statx *sx = io_kiocb_to_cmd(req, struct io_statx);
  56         int ret;
  57
  58         WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
  59
  60         ret = do_statx(sx->dfd, sx->filename, sx->flags, sx->mask, sx->buffer);
  61         io_req_set_res(req, ret, 0);
  62         return IOU_OK;
  63 }
  64
  65 void io_statx_cleanup(struct io_kiocb *req)
  66 {
  67         struct io_statx *sx = io_kiocb_to_cmd(req, struct io_statx);
  68
  69         if (sx->filename)
  70                 putname(sx->filename);
  71 }