| /* vi: set sw=4 ts=4: */ |
| /* |
| * fstrim.c - discard the part (or whole) of mounted filesystem. |
| * |
| * 03 March 2012 - Malek Degachi <malek-degachi@laposte.net> |
| * Adapted for busybox from util-linux-2.12a. |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| */ |
| |
| //usage:#define fstrim_trivial_usage |
| //usage: "[Options] <mountpoint>" |
| //usage:#define fstrim_full_usage "\n\n" |
| //usage: "Options:" |
| //usage: IF_LONG_OPTS( |
| //usage: "\n -o,--offset=offset offset in bytes to discard from" |
| //usage: "\n -l,--length=length length of bytes to discard from the offset" |
| //usage: "\n -m,--minimum=minimum minimum extent length to discard" |
| //usage: "\n -v,--verbose print number of discarded bytes" |
| //usage: ) |
| //usage: IF_NOT_LONG_OPTS( |
| //usage: "\n -o offset offset in bytes to discard from" |
| //usage: "\n -l length length of bytes to discard from the offset" |
| //usage: "\n -m minimum minimum extent length to discard" |
| //usage: "\n -v, print number of discarded bytes" |
| //usage: ) |
| |
| #include "libbb.h" |
| #include <linux/fs.h> |
| |
| #ifndef FITRIM |
| struct fstrim_range { |
| uint64_t start; |
| uint64_t len; |
| uint64_t minlen; |
| }; |
| #define FITRIM _IOWR('X', 121, struct fstrim_range) |
| #endif |
| |
| static const struct suffix_mult fstrim_sfx[] = { |
| { "KiB", 1024 }, |
| { "kiB", 1024 }, |
| { "K", 1024 }, |
| { "k", 1024 }, |
| { "MiB", 1048576 }, |
| { "miB", 1048576 }, |
| { "M", 1048576 }, |
| { "m", 1048576 }, |
| { "GiB", 1073741824 }, |
| { "giB", 1073741824 }, |
| { "G", 1073741824 }, |
| { "g", 1073741824 }, |
| { "KB", 1000 }, |
| { "MB", 1000000 }, |
| { "GB", 1000000000 }, |
| { "", 0 } |
| }; |
| |
| int fstrim_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int fstrim_main(int argc UNUSED_PARAM, char **argv) |
| { |
| struct fstrim_range range; |
| char *arg_o, *arg_l, *arg_m, *mp; |
| unsigned opts; |
| int fd; |
| |
| enum { |
| OPT_o = (1 << 0), |
| OPT_l = (1 << 1), |
| OPT_m = (1 << 2), |
| OPT_v = (1 << 3), |
| }; |
| |
| #if ENABLE_LONG_OPTS |
| static const char getopt_longopts[] ALIGN1 = |
| "offset\0" Required_argument "o" |
| "length\0" Required_argument "l" |
| "minimum\0" Required_argument "m" |
| "verbose\0" No_argument "v" |
| ; |
| applet_long_options = getopt_longopts; |
| #endif |
| |
| opt_complementary = "=1"; /* exactly one non-option arg: the mountpoint */ |
| opts = getopt32(argv, "o:l:m:v", &arg_o, &arg_l, &arg_m); |
| |
| memset(&range, 0, sizeof(range)); |
| range.len = ULLONG_MAX; |
| |
| if (opts & OPT_o) |
| range.start = xatoull_sfx(arg_o, fstrim_sfx); |
| if (opts & OPT_l) |
| range.len = xatoull_sfx(arg_l, fstrim_sfx); |
| if (opts & OPT_m) |
| range.minlen = xatoull_sfx(arg_m, fstrim_sfx); |
| |
| mp = *(argv += optind); |
| if (find_block_device(mp)) { |
| fd = xopen_nonblocking(mp); |
| xioctl(fd, FITRIM, &range); |
| if (ENABLE_FEATURE_CLEAN_UP) |
| close(fd); |
| |
| if (opts & OPT_v) |
| printf("%s: %llu bytes were trimmed\n", mp, range.len); |
| return EXIT_SUCCESS; |
| } |
| return EXIT_FAILURE; |
| } |