2 * blockdev implementation for busybox
4 * Copyright (C) 2010 Sergey Naumov <sknaumov@gmail.com>
6 * Licensed under GPLv2, see file LICENSE in this source tree.
9 //applet:IF_BLOCKDEV(APPLET(blockdev, _BB_DIR_SBIN, _BB_SUID_DROP))
11 //kbuild:lib-$(CONFIG_BLOCKDEV) += blockdev.o
13 //config:config BLOCKDEV
14 //config: bool "blockdev"
17 //config: Performs some ioctls with block devices.
19 //usage:#define blockdev_trivial_usage
20 //usage: "OPTION BLOCKDEV"
21 //usage:#define blockdev_full_usage "\n\n"
23 //usage: "\n --setro Set ro"
24 //usage: "\n --setrw Set rw"
25 //usage: "\n --getro Get ro"
26 //usage: "\n --getss Get sector size"
27 //usage: "\n --getbsz Get block size"
28 //usage: "\n --setbsz BYTES Set block size"
29 //usage: "\n --getsize Get device size in 512-byte sectors"
30 //usage: "\n --getsize64 Get device size in bytes"
31 //usage: "\n --flushbufs Flush buffers"
32 //usage: "\n --rereadpt Reread partition table"
45 FL_USRARG = 4, /* argument is provided by user */
50 uint32_t ioc; /* ioctl code */
51 const char name[sizeof("flushbufs")]; /* "--setfoo" wothout "--" */
53 int8_t argval; /* default argument value */
56 static const struct bdc bdcommands[] = {
60 .flags = ARG_INT + FL_NORESULT,
65 .flags = ARG_INT + FL_NORESULT,
85 .flags = ARG_INT + FL_NORESULT + FL_USRARG,
100 .flags = ARG_NONE + FL_NORESULT,
105 .flags = ARG_NONE + FL_NORESULT,
110 static const struct bdc *find_cmd(const char *s)
112 const struct bdc *bdcmd = bdcommands;
113 if (s[0] == '-' && s[1] == '-') {
116 if (strcmp(s, bdcmd->name) == 0)
119 } while (bdcmd != bdcommands + ARRAY_SIZE(bdcommands));
124 int blockdev_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
125 int blockdev_main(int argc, char **argv)
127 const struct bdc *bdcmd;
132 unsigned long long llu;
134 if ((unsigned)(argc - 3) > 1) /* must have 2 or 3 args */
137 bdcmd = find_cmd(*++argv);
139 llu = (int)bdcmd->argval;
140 if (bdcmd->flags & FL_USRARG)
141 llu = xatoi_positive(*++argv);
147 fd = xopen(*argv, O_RDONLY);
150 switch (bdcmd->flags & ARG_MASK) {
162 if (ioctl(fd, bdcmd->ioc, ioctl_ptr) == -1)
163 bb_simple_perror_msg_and_die(*argv);
165 switch (bdcmd->flags & (ARG_MASK+FL_NORESULT)) {
167 /* Smaller code when we use long long
168 * (gcc tail-merges printf call)
170 printf("%lld\n", (long long)iarg);
176 printf("%llu\n", llu);
180 if (ENABLE_FEATURE_CLEAN_UP)