busybox/util-linux/blkdiscard.c
Denys Vlasenko 22542eca18 getopt32: remove opt_complementary
function                                             old     new   delta
vgetopt32                                           1318    1392     +74
runsvdir_main                                        703     713     +10
bb_make_directory                                    423     425      +2
collect_cpu                                          546     545      -1
opt_chars                                              3       -      -3
opt_complementary                                      4       -      -4
tftpd_main                                           567     562      -5
ntp_init                                             476     471      -5
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whois_main                                           140     130     -10
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vlock_main                                           399     389     -10
uuencode_main                                        332     322     -10
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unlink_main                                           45      35     -10
udhcpd_main                                         1482    1472     -10
udhcpc_main                                         2762    2752     -10
tune2fs_main                                         290     280     -10
tunctl_main                                          366     356     -10
truncate_main                                        218     208     -10
tr_main                                              518     508     -10
time_main                                           1134    1124     -10
tftp_main                                            286     276     -10
telnetd_main                                        1873    1863     -10
tcpudpsvd_main                                      1785    1775     -10
taskset_main                                         521     511     -10
tar_main                                            1009     999     -10
tail_main                                           1644    1634     -10
syslogd_main                                        1967    1957     -10
switch_root_main                                     368     358     -10
svlogd_main                                         1454    1444     -10
sv                                                  1296    1286     -10
stat_main                                            104      94     -10
start_stop_daemon_main                              1028    1018     -10
split_main                                           542     532     -10
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rtcwake_main                                         454     444     -10
rm_main                                              175     165     -10
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readlink_main                                        123     113     -10
rdate_main                                           246     236     -10
pwdx_main                                            189     179     -10
pstree_main                                          317     307     -10
pscan_main                                           663     653     -10
popmaildir_main                                      818     808     -10
pmap_main                                             80      70     -10
nc_main                                             1042    1032     -10
mv_main                                              558     548     -10
mountpoint_main                                      477     467     -10
mount_main                                          1264    1254     -10
modprobe_main                                        768     758     -10
modinfo_main                                         333     323     -10
mktemp_main                                          200     190     -10
mkswap_main                                          324     314     -10
mkfs_vfat_main                                      1489    1479     -10
microcom_main                                        715     705     -10
md5_sha1_sum_main                                    521     511     -10
man_main                                             867     857     -10
makedevs_main                                       1052    1042     -10
ls_main                                              563     553     -10
losetup_main                                         432     422     -10
loadfont_main                                         89      79     -10
ln_main                                              524     514     -10
link_main                                             75      65     -10
ipcalc_main                                          544     534     -10
iostat_main                                         2397    2387     -10
install_main                                         768     758     -10
id_main                                              480     470     -10
i2cset_main                                         1239    1229     -10
i2cget_main                                          380     370     -10
i2cdump_main                                        1482    1472     -10
i2cdetect_main                                       682     672     -10
hwclock_main                                         406     396     -10
httpd_main                                           741     731     -10
grep_main                                            837     827     -10
getty_main                                          1559    1549     -10
fuser_main                                           297     287     -10
ftpgetput_main                                       345     335     -10
ftpd_main                                           2232    2222     -10
fstrim_main                                          251     241     -10
fsfreeze_main                                         77      67     -10
fsck_minix_main                                     2921    2911     -10
flock_main                                           314     304     -10
flashcp_main                                         740     730     -10
flash_eraseall_main                                  833     823     -10
fdformat_main                                        532     522     -10
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diff_main                                           1350    1340     -10
df_main                                             1064    1054     -10
date_main                                           1095    1085     -10
cut_main                                             961     951     -10
cryptpw_main                                         228     218     -10
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crond_main                                          1149    1139     -10
cp_main                                              370     360     -10
common_traceroute_main                              3834    3824     -10
common_ping_main                                    1767    1757     -10
comm_main                                            239     229     -10
cmp_main                                             655     645     -10
chrt_main                                            379     369     -10
chpst_main                                           704     694     -10
chpasswd_main                                        308     298     -10
chown_main                                           171     161     -10
chmod_main                                           158     148     -10
cat_main                                             428     418     -10
bzip2_main                                           120     110     -10
blkdiscard_main                                      264     254     -10
base64_main                                          221     211     -10
arping_main                                         1665    1655     -10
ar_main                                              556     546     -10
adjtimex_main                                        406     396     -10
adduser_main                                         882     872     -10
addgroup_main                                        411     401     -10
acpid_main                                          1198    1188     -10
optstring                                             11       -     -11
opt_string                                            18       -     -18
OPT_STR                                               25       -     -25
ubi_tools_main                                      1288    1258     -30
ls_options                                            31       -     -31
------------------------------------------------------------------------------
(add/remove: 0/6 grow/shrink: 3/129 up/down: 86/-1383)      Total: -1297 bytes
   text	   data	    bss	    dec	    hex	filename
 915428	    485	   6876	 922789	  e14a5	busybox_old
 914629	    485	   6872	 921986	  e1182	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-08 21:55:02 +02:00

89 lines
2.3 KiB
C

/*
* Mini blkdiscard implementation for busybox
*
* Copyright (C) 2015 by Ari Sundholm <ari@tuxera.com> and Tuxera Inc.
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config BLKDISCARD
//config: bool "blkdiscard (5.3 kb)"
//config: default y
//config: help
//config: blkdiscard discards sectors on a given device.
//applet:IF_BLKDISCARD(APPLET_NOEXEC(blkdiscard, blkdiscard, BB_DIR_USR_BIN, BB_SUID_DROP, blkdiscard))
//kbuild:lib-$(CONFIG_BLKDISCARD) += blkdiscard.o
//usage:#define blkdiscard_trivial_usage
//usage: "[-o OFS] [-l LEN] [-s] DEVICE"
//usage:#define blkdiscard_full_usage "\n\n"
//usage: "Discard sectors on DEVICE\n"
//usage: "\n -o OFS Byte offset into device"
//usage: "\n -l LEN Number of bytes to discard"
//usage: "\n -s Perform a secure discard"
//usage:
//usage:#define blkdiscard_example_usage
//usage: "$ blkdiscard -o 0 -l 1G /dev/sdb"
#include "libbb.h"
#include <linux/fs.h>
#ifndef BLKDISCARD
#define BLKDISCARD 0x1277
#endif
#ifndef BLKSECDISCARD
#define BLKSECDISCARD 0x127d
#endif
int blkdiscard_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int blkdiscard_main(int argc UNUSED_PARAM, char **argv)
{
unsigned opts;
const char *offset_str = "0";
const char *length_str;
uint64_t offset; /* Leaving these two variables out does not */
uint64_t length; /* shrink code size and hampers readability. */
uint64_t range[2];
int fd;
enum {
OPT_OFFSET = (1 << 0),
OPT_LENGTH = (1 << 1),
OPT_SECURE = (1 << 2),
};
opts = getopt32(argv, "^" "o:l:s" "\0" "=1", &offset_str, &length_str);
argv += optind;
fd = xopen(argv[0], O_RDWR|O_EXCL);
//Why bother, BLK[SEC]DISCARD will fail on non-blockdevs anyway?
// xfstat(fd, &st);
// if (!S_ISBLK(st.st_mode))
// bb_error_msg_and_die("%s: not a block device", argv[0]);
offset = xatoull_sfx(offset_str, kMG_suffixes);
if (opts & OPT_LENGTH)
length = xatoull_sfx(length_str, kMG_suffixes);
else {
xioctl(fd, BLKGETSIZE64, &length);
length -= offset;
}
range[0] = offset;
range[1] = length;
ioctl_or_perror_and_die(fd,
(opts & OPT_SECURE) ? BLKSECDISCARD : BLKDISCARD,
&range,
"%s: %s failed",
argv[0],
(opts & OPT_SECURE) ? "BLKSECDISCARD" : "BLKDISCARD"
);
if (ENABLE_FEATURE_CLEAN_UP)
close(fd);
return EXIT_SUCCESS;
}