tests/zfs-tests/cmd/dosmode_readonly_write.c

   1 /*
   2  * SPDX-License-Identifier: BSD-2-Clause
   3  *
   4  * Copyright (c) 2021 iXsystems, Inc.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  * Test for correct behavior of DOS mode READONLY flag on a file.
  28  * We should be able to open a file RW, set READONLY, and still write to the fd.
  29  */
  30
  31 #include <sys/stat.h>
  32 #include <err.h>
  33 #include <errno.h>
  34 #include <fcntl.h>
  35 #include <stdio.h>
  36 #include <string.h>
  37 #include <unistd.h>
  38
  39 #ifdef __linux__
  40 #include <stdint.h>
  41 #include <sys/fs/zfs.h>
  42 #endif
  43
  44 int
  45 main(int argc, const char *argv[])
  46 {
  47         const char *buf = "We should be allowed to write this to the fd.\n";
  48         const char *path;
  49         int fd;
  50
  51         if (argc != 2) {
  52                 fprintf(stderr, "usage: %s PATH\n", argv[0]);
  53                 return (EXIT_FAILURE);
  54         }
  55         path = argv[1];
  56         fd = open(path, O_CREAT|O_RDWR, 0777);
  57         if (fd == -1)
  58                 err(EXIT_FAILURE, "%s: open failed", path);
  59 #ifdef __linux__
  60         uint64_t dosflags = ZFS_READONLY;
  61         if (ioctl(fd, ZFS_IOC_SETDOSFLAGS, &dosflags) == -1)
  62                 err(EXIT_FAILURE, "%s: ZFS_IOC_SETDOSFLAGS failed", path);
  63 #else
  64         if (chflags(path, UF_READONLY) == -1)
  65                 err(EXIT_FAILURE, "%s: chflags failed", path);
  66 #endif
  67         if (write(fd, buf, strlen(buf)) == -1)
  68                 err(EXIT_FAILURE, "%s: write failed", path);
  69         if (close(fd) == -1)
  70                 err(EXIT_FAILURE, "%s: close failed", path);
  71         return (EXIT_SUCCESS);
  72 }