Malek Degachi | 1d39e33 | 2013-11-09 21:27:27 +0100 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * fstrim.c - discard the part (or whole) of mounted filesystem. |
| 4 | * |
| 5 | * 03 March 2012 - Malek Degachi <malek-degachi@laposte.net> |
| 6 | * Adapted for busybox from util-linux-2.12a. |
| 7 | * |
| 8 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| 9 | */ |
| 10 | |
| 11 | //usage:#define fstrim_trivial_usage |
| 12 | //usage: "[Options] <mountpoint>" |
| 13 | //usage:#define fstrim_full_usage "\n\n" |
| 14 | //usage: "Options:" |
| 15 | //usage: IF_LONG_OPTS( |
| 16 | //usage: "\n -o,--offset=offset offset in bytes to discard from" |
| 17 | //usage: "\n -l,--length=length length of bytes to discard from the offset" |
| 18 | //usage: "\n -m,--minimum=minimum minimum extent length to discard" |
| 19 | //usage: "\n -v,--verbose print number of discarded bytes" |
| 20 | //usage: ) |
| 21 | //usage: IF_NOT_LONG_OPTS( |
| 22 | //usage: "\n -o offset offset in bytes to discard from" |
| 23 | //usage: "\n -l length length of bytes to discard from the offset" |
| 24 | //usage: "\n -m minimum minimum extent length to discard" |
| 25 | //usage: "\n -v, print number of discarded bytes" |
| 26 | //usage: ) |
| 27 | |
| 28 | #include "libbb.h" |
| 29 | #include <linux/fs.h> |
| 30 | |
| 31 | #ifndef FITRIM |
| 32 | struct fstrim_range { |
| 33 | uint64_t start; |
| 34 | uint64_t len; |
| 35 | uint64_t minlen; |
| 36 | }; |
| 37 | #define FITRIM _IOWR('X', 121, struct fstrim_range) |
| 38 | #endif |
| 39 | |
| 40 | static const struct suffix_mult fstrim_sfx[] = { |
| 41 | { "KiB", 1024 }, |
| 42 | { "kiB", 1024 }, |
| 43 | { "K", 1024 }, |
| 44 | { "k", 1024 }, |
| 45 | { "MiB", 1048576 }, |
| 46 | { "miB", 1048576 }, |
| 47 | { "M", 1048576 }, |
| 48 | { "m", 1048576 }, |
| 49 | { "GiB", 1073741824 }, |
| 50 | { "giB", 1073741824 }, |
| 51 | { "G", 1073741824 }, |
| 52 | { "g", 1073741824 }, |
| 53 | { "KB", 1000 }, |
| 54 | { "MB", 1000000 }, |
| 55 | { "GB", 1000000000 }, |
| 56 | { "", 0 } |
| 57 | }; |
| 58 | |
| 59 | int fstrim_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 60 | int fstrim_main(int argc UNUSED_PARAM, char **argv) |
| 61 | { |
| 62 | struct fstrim_range range; |
Bernhard Reutner-Fischer | 5e63776 | 2013-11-10 21:47:02 +0100 | [diff] [blame] | 63 | char *arg_o, *arg_l, *arg_m, *mp; |
Malek Degachi | 1d39e33 | 2013-11-09 21:27:27 +0100 | [diff] [blame] | 64 | unsigned opts; |
| 65 | int fd; |
| 66 | |
| 67 | enum { |
| 68 | OPT_o = (1 << 0), |
| 69 | OPT_l = (1 << 1), |
| 70 | OPT_m = (1 << 2), |
| 71 | OPT_v = (1 << 3), |
| 72 | }; |
| 73 | |
| 74 | #if ENABLE_LONG_OPTS |
| 75 | static const char getopt_longopts[] ALIGN1 = |
| 76 | "offset\0" Required_argument "o" |
| 77 | "length\0" Required_argument "l" |
| 78 | "minimum\0" Required_argument "m" |
| 79 | "verbose\0" No_argument "v" |
| 80 | ; |
| 81 | applet_long_options = getopt_longopts; |
| 82 | #endif |
| 83 | |
| 84 | opt_complementary = "=1"; /* exactly one non-option arg: the mountpoint */ |
| 85 | opts = getopt32(argv, "o:l:m:v", &arg_o, &arg_l, &arg_m); |
| 86 | |
| 87 | memset(&range, 0, sizeof(range)); |
| 88 | range.len = ULLONG_MAX; |
| 89 | |
| 90 | if (opts & OPT_o) |
| 91 | range.start = xatoull_sfx(arg_o, fstrim_sfx); |
| 92 | if (opts & OPT_l) |
| 93 | range.len = xatoull_sfx(arg_l, fstrim_sfx); |
| 94 | if (opts & OPT_m) |
| 95 | range.minlen = xatoull_sfx(arg_m, fstrim_sfx); |
| 96 | |
Bernhard Reutner-Fischer | 5e63776 | 2013-11-10 21:47:02 +0100 | [diff] [blame] | 97 | mp = *(argv += optind); |
| 98 | if (find_block_device(mp)) { |
| 99 | fd = xopen_nonblocking(mp); |
Malek Degachi | 1d39e33 | 2013-11-09 21:27:27 +0100 | [diff] [blame] | 100 | xioctl(fd, FITRIM, &range); |
| 101 | if (ENABLE_FEATURE_CLEAN_UP) |
| 102 | close(fd); |
| 103 | |
| 104 | if (opts & OPT_v) |
Bernhard Reutner-Fischer | 5e63776 | 2013-11-10 21:47:02 +0100 | [diff] [blame] | 105 | printf("%s: %llu bytes were trimmed\n", mp, range.len); |
Bernhard Reutner-Fischer | b1489f9 | 2013-11-10 00:02:43 +0100 | [diff] [blame] | 106 | return EXIT_SUCCESS; |
Malek Degachi | 1d39e33 | 2013-11-09 21:27:27 +0100 | [diff] [blame] | 107 | } |
Bernhard Reutner-Fischer | b1489f9 | 2013-11-10 00:02:43 +0100 | [diff] [blame] | 108 | return EXIT_FAILURE; |
Malek Degachi | 1d39e33 | 2013-11-09 21:27:27 +0100 | [diff] [blame] | 109 | } |