[3621] | 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 | //config:config FSTRIM
|
---|
| 12 | //config: bool "fstrim"
|
---|
| 13 | //config: default y
|
---|
| 14 | //config: select PLATFORM_LINUX
|
---|
| 15 | //config: help
|
---|
| 16 | //config: Discard unused blocks on a mounted filesystem.
|
---|
| 17 |
|
---|
| 18 | //applet:IF_FSTRIM(APPLET(fstrim, BB_DIR_SBIN, BB_SUID_DROP))
|
---|
| 19 |
|
---|
| 20 | //kbuild:lib-$(CONFIG_FSTRIM) += fstrim.o
|
---|
| 21 |
|
---|
| 22 | //usage:#define fstrim_trivial_usage
|
---|
| 23 | //usage: "[OPTIONS] MOUNTPOINT"
|
---|
| 24 | //usage:#define fstrim_full_usage "\n\n"
|
---|
| 25 | //usage: IF_LONG_OPTS(
|
---|
| 26 | //usage: " -o,--offset=OFFSET Offset in bytes to discard from"
|
---|
| 27 | //usage: "\n -l,--length=LEN Bytes to discard"
|
---|
| 28 | //usage: "\n -m,--minimum=MIN Minimum extent length"
|
---|
| 29 | //usage: "\n -v,--verbose Print number of discarded bytes"
|
---|
| 30 | //usage: )
|
---|
| 31 | //usage: IF_NOT_LONG_OPTS(
|
---|
| 32 | //usage: " -o OFFSET Offset in bytes to discard from"
|
---|
| 33 | //usage: "\n -l LEN Bytes to discard"
|
---|
| 34 | //usage: "\n -m MIN Minimum extent length"
|
---|
| 35 | //usage: "\n -v Print number of discarded bytes"
|
---|
| 36 | //usage: )
|
---|
| 37 |
|
---|
| 38 | #include "libbb.h"
|
---|
| 39 | #include <linux/fs.h>
|
---|
| 40 |
|
---|
| 41 | #ifndef FITRIM
|
---|
| 42 | struct fstrim_range {
|
---|
| 43 | uint64_t start;
|
---|
| 44 | uint64_t len;
|
---|
| 45 | uint64_t minlen;
|
---|
| 46 | };
|
---|
| 47 | #define FITRIM _IOWR('X', 121, struct fstrim_range)
|
---|
| 48 | #endif
|
---|
| 49 |
|
---|
| 50 | static const struct suffix_mult fstrim_sfx[] = {
|
---|
| 51 | { "KiB", 1024 },
|
---|
| 52 | { "kiB", 1024 },
|
---|
| 53 | { "K", 1024 },
|
---|
| 54 | { "k", 1024 },
|
---|
| 55 | { "MiB", 1048576 },
|
---|
| 56 | { "miB", 1048576 },
|
---|
| 57 | { "M", 1048576 },
|
---|
| 58 | { "m", 1048576 },
|
---|
| 59 | { "GiB", 1073741824 },
|
---|
| 60 | { "giB", 1073741824 },
|
---|
| 61 | { "G", 1073741824 },
|
---|
| 62 | { "g", 1073741824 },
|
---|
| 63 | { "KB", 1000 },
|
---|
| 64 | { "MB", 1000000 },
|
---|
| 65 | { "GB", 1000000000 },
|
---|
| 66 | { "", 0 }
|
---|
| 67 | };
|
---|
| 68 |
|
---|
| 69 | int fstrim_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 70 | int fstrim_main(int argc UNUSED_PARAM, char **argv)
|
---|
| 71 | {
|
---|
| 72 | struct fstrim_range range;
|
---|
| 73 | char *arg_o, *arg_l, *arg_m, *mp;
|
---|
| 74 | unsigned opts;
|
---|
| 75 | int fd;
|
---|
| 76 |
|
---|
| 77 | enum {
|
---|
| 78 | OPT_o = (1 << 0),
|
---|
| 79 | OPT_l = (1 << 1),
|
---|
| 80 | OPT_m = (1 << 2),
|
---|
| 81 | OPT_v = (1 << 3),
|
---|
| 82 | };
|
---|
| 83 |
|
---|
| 84 | #if ENABLE_LONG_OPTS
|
---|
| 85 | static const char getopt_longopts[] ALIGN1 =
|
---|
| 86 | "offset\0" Required_argument "o"
|
---|
| 87 | "length\0" Required_argument "l"
|
---|
| 88 | "minimum\0" Required_argument "m"
|
---|
| 89 | "verbose\0" No_argument "v"
|
---|
| 90 | ;
|
---|
| 91 | applet_long_options = getopt_longopts;
|
---|
| 92 | #endif
|
---|
| 93 |
|
---|
| 94 | opt_complementary = "=1"; /* exactly one non-option arg: the mountpoint */
|
---|
| 95 | opts = getopt32(argv, "o:l:m:v", &arg_o, &arg_l, &arg_m);
|
---|
| 96 |
|
---|
| 97 | memset(&range, 0, sizeof(range));
|
---|
| 98 | range.len = ULLONG_MAX;
|
---|
| 99 |
|
---|
| 100 | if (opts & OPT_o)
|
---|
| 101 | range.start = xatoull_sfx(arg_o, fstrim_sfx);
|
---|
| 102 | if (opts & OPT_l)
|
---|
| 103 | range.len = xatoull_sfx(arg_l, fstrim_sfx);
|
---|
| 104 | if (opts & OPT_m)
|
---|
| 105 | range.minlen = xatoull_sfx(arg_m, fstrim_sfx);
|
---|
| 106 |
|
---|
| 107 | mp = argv[optind];
|
---|
| 108 | if (find_block_device(mp)) {
|
---|
| 109 | fd = xopen_nonblocking(mp);
|
---|
| 110 | xioctl(fd, FITRIM, &range);
|
---|
| 111 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
| 112 | close(fd);
|
---|
| 113 |
|
---|
| 114 | if (opts & OPT_v)
|
---|
| 115 | printf("%s: %llu bytes trimmed\n", mp, (unsigned long long)range.len);
|
---|
| 116 | return EXIT_SUCCESS;
|
---|
| 117 | }
|
---|
| 118 | return EXIT_FAILURE;
|
---|
| 119 | }
|
---|