108 lines
2.7 KiB
C
108 lines
2.7 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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//config:config FSTRIM
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//config: bool "fstrim (4.4 kb)"
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//config: default y
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//config: select PLATFORM_LINUX
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//config: help
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//config: Discard unused blocks on a mounted filesystem.
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//applet:IF_FSTRIM(APPLET_NOEXEC(fstrim, fstrim, BB_DIR_SBIN, BB_SUID_DROP, fstrim))
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//kbuild:lib-$(CONFIG_FSTRIM) += fstrim.o
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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: IF_LONG_OPTS(
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//usage: " -o,--offset OFFSET Offset in bytes to discard from"
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//usage: "\n -l,--length LEN Bytes to discard"
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//usage: "\n -m,--minimum MIN Minimum extent length"
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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: " -o OFFSET Offset in bytes to discard from"
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//usage: "\n -l LEN Bytes to discard"
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//usage: "\n -m MIN Minimum extent length"
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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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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, *mp;
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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 fstrim_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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#endif
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opts = getopt32long(argv, "^"
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"o:l:m:v"
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"\0" "=1", fstrim_longopts,
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&arg_o, &arg_l, &arg_m
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);
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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, kmg_i_suffixes);
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if (opts & OPT_l)
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range.len = xatoull_sfx(arg_l, kmg_i_suffixes);
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if (opts & OPT_m)
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range.minlen = xatoull_sfx(arg_m, kmg_i_suffixes);
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mp = argv[optind];
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//Wwhy bother checking that it's a blockdev?
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// if (find_block_device(mp)) {
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fd = xopen_nonblocking(mp);
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/* On ENOTTY error, util-linux 2.31 says:
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* "fstrim: FILE: the discard operation is not supported"
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*/
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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 trimmed\n", mp, (unsigned long long)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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