1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * fstrim.c - discard the part (or whole) of mounted filesystem.
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4 | *
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5 | * 03 March 2012 - Malek Degachi <malek-degachi@laposte.net>
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6 | * Adapted for busybox from util-linux-2.12a.
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7 | *
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8 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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9 | */
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10 |
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11 | //config:config FSTRIM
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12 | //config: bool "fstrim"
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13 | //config: default y
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14 | //config: select PLATFORM_LINUX
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15 | //config: help
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16 | //config: Discard unused blocks on a mounted filesystem.
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17 |
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18 | //applet:IF_FSTRIM(APPLET(fstrim, BB_DIR_SBIN, BB_SUID_DROP))
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19 |
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20 | //kbuild:lib-$(CONFIG_FSTRIM) += fstrim.o
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21 |
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22 | //usage:#define fstrim_trivial_usage
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23 | //usage: "[OPTIONS] MOUNTPOINT"
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24 | //usage:#define fstrim_full_usage "\n\n"
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25 | //usage: IF_LONG_OPTS(
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26 | //usage: " -o,--offset=OFFSET Offset in bytes to discard from"
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27 | //usage: "\n -l,--length=LEN Bytes to discard"
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28 | //usage: "\n -m,--minimum=MIN Minimum extent length"
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29 | //usage: "\n -v,--verbose Print number of discarded bytes"
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30 | //usage: )
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31 | //usage: IF_NOT_LONG_OPTS(
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32 | //usage: " -o OFFSET Offset in bytes to discard from"
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33 | //usage: "\n -l LEN Bytes to discard"
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34 | //usage: "\n -m MIN Minimum extent length"
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35 | //usage: "\n -v Print number of discarded bytes"
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36 | //usage: )
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37 |
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38 | #include "libbb.h"
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39 | #include <linux/fs.h>
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40 |
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41 | #ifndef FITRIM
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42 | struct fstrim_range {
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43 | uint64_t start;
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44 | uint64_t len;
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45 | uint64_t minlen;
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46 | };
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47 | #define FITRIM _IOWR('X', 121, struct fstrim_range)
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48 | #endif
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49 |
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50 | static const struct suffix_mult fstrim_sfx[] = {
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51 | { "KiB", 1024 },
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52 | { "kiB", 1024 },
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53 | { "K", 1024 },
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54 | { "k", 1024 },
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55 | { "MiB", 1048576 },
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56 | { "miB", 1048576 },
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57 | { "M", 1048576 },
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58 | { "m", 1048576 },
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59 | { "GiB", 1073741824 },
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60 | { "giB", 1073741824 },
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61 | { "G", 1073741824 },
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62 | { "g", 1073741824 },
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63 | { "KB", 1000 },
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64 | { "MB", 1000000 },
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65 | { "GB", 1000000000 },
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66 | { "", 0 }
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67 | };
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68 |
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69 | int fstrim_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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70 | int fstrim_main(int argc UNUSED_PARAM, char **argv)
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71 | {
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72 | struct fstrim_range range;
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73 | char *arg_o, *arg_l, *arg_m, *mp;
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74 | unsigned opts;
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75 | int fd;
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76 |
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77 | enum {
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78 | OPT_o = (1 << 0),
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79 | OPT_l = (1 << 1),
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80 | OPT_m = (1 << 2),
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81 | OPT_v = (1 << 3),
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82 | };
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83 |
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84 | #if ENABLE_LONG_OPTS
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85 | static const char getopt_longopts[] ALIGN1 =
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86 | "offset\0" Required_argument "o"
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87 | "length\0" Required_argument "l"
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88 | "minimum\0" Required_argument "m"
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89 | "verbose\0" No_argument "v"
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90 | ;
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91 | applet_long_options = getopt_longopts;
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92 | #endif
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93 |
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94 | opt_complementary = "=1"; /* exactly one non-option arg: the mountpoint */
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95 | opts = getopt32(argv, "o:l:m:v", &arg_o, &arg_l, &arg_m);
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96 |
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97 | memset(&range, 0, sizeof(range));
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98 | range.len = ULLONG_MAX;
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99 |
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100 | if (opts & OPT_o)
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101 | range.start = xatoull_sfx(arg_o, fstrim_sfx);
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102 | if (opts & OPT_l)
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103 | range.len = xatoull_sfx(arg_l, fstrim_sfx);
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104 | if (opts & OPT_m)
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105 | range.minlen = xatoull_sfx(arg_m, fstrim_sfx);
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106 |
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107 | mp = argv[optind];
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108 | if (find_block_device(mp)) {
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109 | fd = xopen_nonblocking(mp);
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110 | xioctl(fd, FITRIM, &range);
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111 | if (ENABLE_FEATURE_CLEAN_UP)
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112 | close(fd);
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113 |
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114 | if (opts & OPT_v)
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115 | printf("%s: %llu bytes trimmed\n", mp, (unsigned long long)range.len);
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116 | return EXIT_SUCCESS;
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117 | }
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118 | return EXIT_FAILURE;
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119 | }
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