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blockdev: new applet

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function                                             old     new   delta
blockdev_main                                          -     287    +287
bdcommands                                             -     160    +160
packed_usage                                       27203   27298     +95
applet_names                                        2297    2306      +9
applet_main                                         1352    1356      +4
applet_nameofs                                       676     678      +2
applet_install_loc                                   169     170      +1
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(add/remove: 3/0 grow/shrink: 5/0 up/down: 558/0)             Total: 558 bytes

Signed-off-by: Sergey Naumov <sknaumov@gmail.com>
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
This commit is contained in:
Sergey Naumov 2010-09-06 13:35:58 +02:00 committed by Denys Vlasenko
parent 605067b426
commit 289aff8623
1 changed files with 180 additions and 0 deletions
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180
util-linux/blockdev.c Normal file
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@ -0,0 +1,180 @@
/*
* blockdev implementation for busybox
*
* Copyright (C) 2010 Sergey Naumov <sknaumov@gmail.com>
*
* Licensed under GPLv2, see file License in this tarball for details.
*/
//applet:IF_BLOCKDEV(APPLET(blockdev, _BB_DIR_SBIN, _BB_SUID_DROP))
//kbuild:lib-$(CONFIG_BLOCKDEV) += blockdev.o
//config:config BLOCKDEV
//config: bool "blockdev"
//config: default y
//config: help
//config: Performs some ioctls with block devices.
//usage:#define blockdev_trivial_usage
//usage: "OPTION [OPTARG] DEVICE"
//usage:#define blockdev_full_usage "\n\n"
//usage: "Options:"
//usage: "\n --setro Set ro"
//usage: "\n --setrw Set rw"
//usage: "\n --getro Get ro"
//usage: "\n --getss Get sector size"
//usage: "\n --getbsz Get block size"
//usage: "\n --setbsz BYTES Set block size"
//usage: "\n --getsize Get device size in 512-byte sectors"
//usage: "\n --getsize64 Get device size in bytes"
//usage: "\n --flushbufs Flush buffers"
//usage: "\n --rereadpt Reread partition table"
#include "libbb.h"
#include <linux/fs.h>
enum {
ARG_NONE = 0,
ARG_INT = 1,
ARG_ULONG = 2,
ARG_ULLONG = 3,
ARG_MASK = 3,
FL_USRARG = 4, /* argument is provided by user */
FL_NORESULT = 8,
};
struct bdc {
uint32_t ioc; /* ioctl code */
const char name[sizeof("flushbufs")]; /* "--setfoo" wothout "--" */
uint8_t flags;
int8_t argval; /* default argument value */
};
static const struct bdc bdcommands[] = {
{
.ioc = BLKROSET,
.name = "setro",
.flags = ARG_INT + FL_NORESULT,
.argval = 1,
},{
.ioc = BLKROSET,
.name = "setrw",
.flags = ARG_INT + FL_NORESULT,
.argval = 0,
},{
.ioc = BLKROGET,
.name = "getro",
.flags = ARG_INT,
.argval = -1,
},{
.ioc = BLKSSZGET,
.name = "getss",
.flags = ARG_INT,
.argval = -1,
},{
.ioc = BLKBSZGET,
.name = "getbsz",
.flags = ARG_INT,
.argval = -1,
},{
.ioc = BLKBSZSET,
.name = "setbsz",
.flags = ARG_INT + FL_NORESULT + FL_USRARG,
.argval = 0,
},{
.ioc = BLKGETSIZE,
.name = "getsize",
.flags = ARG_ULONG,
.argval = -1,
},{
.ioc = BLKGETSIZE64,
.name = "getsize64",
.flags = ARG_ULLONG,
.argval = -1,
},{
.ioc = BLKFLSBUF,
.name = "flushbufs",
.flags = ARG_NONE + FL_NORESULT,
.argval = 0,
},{
.ioc = BLKRRPART,
.name = "rereadpt",
.flags = ARG_NONE + FL_NORESULT,
.argval = 0,
}
};
static const struct bdc *find_cmd(const char *s)
{
int j;
if (*s++ == '-')
if (*s++ == '-')
for (j = 0; j < ARRAY_SIZE(bdcommands); j++)
if (strcmp(s, bdcommands[j].name) == 0)
return &bdcommands[j];
bb_show_usage();
}
int blockdev_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int blockdev_main(int argc, char **argv)
{
const struct bdc *bdcmd;
void *ioctl_ptr;
int fd;
int iarg;
unsigned long lu;
unsigned long long llu;
if ((unsigned)(argc - 3) > 1) /* must have 2 or 3 args */
bb_show_usage();
bdcmd = find_cmd(*++argv);
llu = (int)bdcmd->argval;
if (bdcmd->flags & FL_USRARG)
llu = xatoi_positive(*++argv);
lu = llu;
iarg = llu;
if (!*++argv)
bb_show_usage();
fd = xopen(*argv, O_RDONLY);
ioctl_ptr = NULL;
switch (bdcmd->flags & ARG_MASK) {
case ARG_INT:
ioctl_ptr = &iarg;
break;
case ARG_ULONG:
ioctl_ptr = &lu;
break;
case ARG_ULLONG:
ioctl_ptr = &llu;
break;
}
if (ioctl(fd, bdcmd->ioc, ioctl_ptr) == -1)
bb_simple_perror_msg_and_die(*argv);
switch (bdcmd->flags & (ARG_MASK+FL_NORESULT)) {
case ARG_INT:
/* Smaller code when we use long long
* (gcc tail-merges printf call)
*/
printf("%lld\n", (long long)iarg);
break;
case ARG_ULONG:
llu = lu;
/* FALLTHROUGH */
case ARG_ULLONG:
printf("%llu\n", llu);
break;
}
if (ENABLE_FEATURE_CLEAN_UP)
close(fd);
return EXIT_SUCCESS;
}