1 /* vi: set sw=4 ts=4: */
3 * fstrim.c - discard the part (or whole) of mounted filesystem.
5 * 03 March 2012 - Malek Degachi <malek-degachi@laposte.net>
6 * Adapted for busybox from util-linux-2.12a.
8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
11 //config:config FSTRIM
12 //config: bool "fstrim"
14 //config: select PLATFORM_LINUX
16 //config: Discard unused blocks on a mounted filesystem.
18 //applet:IF_FSTRIM(APPLET(fstrim, BB_DIR_SBIN, BB_SUID_DROP))
20 //kbuild:lib-$(CONFIG_FSTRIM) += fstrim.o
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"
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"
47 #define FITRIM _IOWR('X', 121, struct fstrim_range)
50 int fstrim_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
51 int fstrim_main(int argc UNUSED_PARAM, char **argv)
53 struct fstrim_range range;
54 char *arg_o, *arg_l, *arg_m, *mp;
66 static const char getopt_longopts[] ALIGN1 =
67 "offset\0" Required_argument "o"
68 "length\0" Required_argument "l"
69 "minimum\0" Required_argument "m"
70 "verbose\0" No_argument "v"
72 applet_long_options = getopt_longopts;
75 opt_complementary = "=1"; /* exactly one non-option arg: the mountpoint */
76 opts = getopt32(argv, "o:l:m:v", &arg_o, &arg_l, &arg_m);
78 memset(&range, 0, sizeof(range));
79 range.len = ULLONG_MAX;
82 range.start = xatoull_sfx(arg_o, kmg_i_suffixes);
84 range.len = xatoull_sfx(arg_l, kmg_i_suffixes);
86 range.minlen = xatoull_sfx(arg_m, kmg_i_suffixes);
89 if (find_block_device(mp)) {
90 fd = xopen_nonblocking(mp);
91 xioctl(fd, FITRIM, &range);
92 if (ENABLE_FEATURE_CLEAN_UP)
96 printf("%s: %llu bytes trimmed\n", mp, (unsigned long long)range.len);