src/bin/fstrim.cpp

   1 /*
   2  * Copyright 2013, Axel Dörfler, axeld@pinc-software.de.
   3  * Distributed under the terms of the MIT license.
   4  */
   5
   6
   7 #include <errno.h>
   8 #include <fcntl.h>
   9 #include <getopt.h>
  10 #include <stdint.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14
  15 #include <Drivers.h>
  16
  17 #include <AutoDeleter.h>
  18
  19
  20 static struct option const kLongOptions[] = {
  21         {"help", no_argument, 0, 'h'},
  22         {NULL}
  23 };
  24
  25
  26 extern const char *__progname;
  27 static const char *kProgramName = __progname;
  28
  29
  30 void
  31 usage(int returnValue)
  32 {
  33         fprintf(stderr, "Usage: %s <path-to-mounted-file-system>\n", kProgramName);
  34         exit(returnValue);
  35 }
  36
  37
  38 int
  39 main(int argc, char** argv)
  40 {
  41         int c;
  42         while ((c = getopt_long(argc, argv, "h", kLongOptions, NULL)) != -1) {
  43                 switch (c) {
  44                         case 0:
  45                                 break;
  46                         case 'h':
  47                                 usage(0);
  48                                 break;
  49                         default:
  50                                 usage(1);
  51                                 break;
  52                 }
  53         }
  54
  55         if (argc - optind < 1)
  56                 usage(1);
  57         const char* path = argv[optind++];
  58
  59         int fd = open(path, O_RDONLY);
  60         if (fd < 0) {
  61                 fprintf(stderr, "%s: Could not access path: %s\n", kProgramName,
  62                         strerror(errno));
  63                 return EXIT_FAILURE;
  64         }
  65
  66         FileDescriptorCloser closer(fd);
  67
  68         fs_trim_data trimData;
  69         trimData.range_count = 1;
  70         trimData.ranges[0].offset = 0;
  71         trimData.ranges[0].size = UINT64_MAX;
  72         trimData.trimmed_size = 0;
  73
  74         if (ioctl(fd, B_TRIM_DEVICE, &trimData, sizeof(fs_trim_data)) != 0) {
  75                 fprintf(stderr, "%s: Trimming failed: %s\n", kProgramName,
  76                         strerror(errno));
  77                 return EXIT_FAILURE;
  78         }
  79
  80         printf("Trimmed %" B_PRIu64 " bytes from device.\n", trimData.trimmed_size);
  81         return EXIT_SUCCESS;
  82 }