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