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/* 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.
*/
//config:config FSTRIM
//config: bool "fstrim (5.5 kb)"
//config: default y
//config: select PLATFORM_LINUX
//config: help
//config: Discard unused blocks on a mounted filesystem.
//applet:IF_FSTRIM(APPLET_NOEXEC(fstrim, fstrim, BB_DIR_SBIN, BB_SUID_DROP, fstrim))
//kbuild:lib-$(CONFIG_FSTRIM) += fstrim.o
//usage:#define fstrim_trivial_usage
//usage: "[OPTIONS] MOUNTPOINT"
//usage:#define fstrim_full_usage "\n\n"
//usage: IF_LONG_OPTS(
//usage: " -o,--offset OFFSET Offset in bytes to discard from"
//usage: "\n -l,--length LEN Bytes to discard"
//usage: "\n -m,--minimum MIN Minimum extent length"
//usage: "\n -v,--verbose Print number of discarded bytes"
//usage: )
//usage: IF_NOT_LONG_OPTS(
//usage: " -o OFFSET Offset in bytes to discard from"
//usage: "\n -l LEN Bytes to discard"
//usage: "\n -m MIN Minimum extent length"
//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
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 fstrim_longopts[] ALIGN1 =
"offset\0" Required_argument "o"
"length\0" Required_argument "l"
"minimum\0" Required_argument "m"
"verbose\0" No_argument "v"
;
#endif
opt_complementary = "=1"; /* exactly one non-option arg: the mountpoint */
opts = getopt32long(argv, "o:l:m:v", fstrim_longopts, &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, kmg_i_suffixes);
if (opts & OPT_l)
range.len = xatoull_sfx(arg_l, kmg_i_suffixes);
if (opts & OPT_m)
range.minlen = xatoull_sfx(arg_m, kmg_i_suffixes);
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 trimmed\n", mp, (unsigned long long)range.len);
return EXIT_SUCCESS;
}
return EXIT_FAILURE;
}
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