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/*
* SPDX-License-Identifier: GPL-2.0-or-later
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* blockdev.c --- Do various simple block device ioctls from the command line
* aeb, 991028
*
* Copyright (C) 2007-2023 Karel Zak <kzak@redhat.com>
*/
#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <errno.h>
#ifdef HAVE_LINUX_BLKZONED_H
#include <linux/blkzoned.h>
#endif
#include "c.h"
#include "nls.h"
#include "blkdev.h"
#include "pathnames.h"
#include "closestream.h"
#include "strutils.h"
#include "sysfs.h"
struct bdc {
long ioc; /* ioctl code */
const char *iocname; /* ioctl name (e.g. BLKROSET) */
long argval; /* default argument */
const char *name; /* --setfoo */
const char *argname; /* argument name or NULL */
const char *help;
int argtype;
int flags;
};
/* command flags */
enum {
FL_NOPTR = (1 << 1), /* does not assume pointer (ARG_INT only)*/
FL_NORESULT = (1 << 2) /* does not return any data */
};
/* ioctl argument types */
enum {
ARG_NONE,
ARG_USHRT,
ARG_INT,
ARG_UINT,
ARG_LONG,
ARG_ULONG,
ARG_LLONG,
ARG_ULLONG
};
#define IOCTL_ENTRY( io ) .ioc = io, .iocname = # io
static const struct bdc bdcms[] =
{
{
IOCTL_ENTRY(BLKROSET),
.name = "--setro",
.argtype = ARG_INT,
.argval = 1,
.flags = FL_NORESULT,
.help = N_("set read-only")
},{
IOCTL_ENTRY(BLKROSET),
.name = "--setrw",
.argtype = ARG_INT,
.argval = 0,
.flags = FL_NORESULT,
.help = N_("set read-write")
},{
IOCTL_ENTRY(BLKROGET),
.name = "--getro",
.argtype = ARG_INT,
.argval = -1,
.help = N_("get read-only")
},{
IOCTL_ENTRY(BLKDISCARDZEROES),
.name = "--getdiscardzeroes",
.argtype = ARG_UINT,
.argval = -1,
.help = N_("get discard zeroes support status")
},{
IOCTL_ENTRY(BLKSSZGET),
.name = "--getss",
.argtype = ARG_INT,
.argval = -1,
.help = N_("get logical block (sector) size")
},{
IOCTL_ENTRY(BLKPBSZGET),
.name = "--getpbsz",
.argtype = ARG_UINT,
.argval = -1,
.help = N_("get physical block (sector) size")
},{
IOCTL_ENTRY(BLKIOMIN),
.name = "--getiomin",
.argtype = ARG_UINT,
.argval = -1,
.help = N_("get minimum I/O size")
},{
IOCTL_ENTRY(BLKIOOPT),
.name = "--getioopt",
.argtype = ARG_UINT,
.argval = -1,
.help = N_("get optimal I/O size")
},{
IOCTL_ENTRY(BLKALIGNOFF),
.name = "--getalignoff",
.argtype = ARG_INT,
.argval = -1,
.help = N_("get alignment offset in bytes")
},{
IOCTL_ENTRY(BLKSECTGET),
.name = "--getmaxsect",
.argtype = ARG_USHRT,
.argval = -1,
.help = N_("get max sectors per request")
},{
IOCTL_ENTRY(BLKBSZGET),
.name = "--getbsz",
.argtype = ARG_INT,
.argval = -1,
.help = N_("get blocksize")
},{
IOCTL_ENTRY(BLKBSZSET),
.name = "--setbsz",
.argname = "<bytes>",
.argtype = ARG_INT,
.flags = FL_NORESULT,
.help = N_("set blocksize on file descriptor opening the block device")
},{
IOCTL_ENTRY(BLKGETSIZE),
.name = "--getsize",
.argtype = ARG_ULONG,
.argval = -1,
.help = N_("get 32-bit sector count (deprecated, use --getsz)")
},{
IOCTL_ENTRY(BLKGETSIZE64),
.name = "--getsize64",
.argtype = ARG_ULLONG,
.argval = -1,
.help = N_("get size in bytes")
},{
IOCTL_ENTRY(BLKRASET),
.name = "--setra",
.argname = "<sectors>",
.argtype = ARG_INT,
.flags = FL_NOPTR | FL_NORESULT,
.help = N_("set readahead")
},{
IOCTL_ENTRY(BLKRAGET),
.name = "--getra",
.argtype = ARG_LONG,
.argval = -1,
.help = N_("get readahead")
},{
IOCTL_ENTRY(BLKFRASET),
.name = "--setfra",
.argname = "<sectors>",
.argtype = ARG_INT,
.flags = FL_NOPTR | FL_NORESULT,
.help = N_("set filesystem readahead")
},{
IOCTL_ENTRY(BLKFRAGET),
.name = "--getfra",
.argtype = ARG_LONG,
.argval = -1,
.help = N_("get filesystem readahead")
},{
IOCTL_ENTRY(BLKGETDISKSEQ),
.name = "--getdiskseq",
.argtype = ARG_ULLONG,
.argval = -1,
.help = N_("get disk sequence number")
},{
#ifdef BLKGETZONESZ
IOCTL_ENTRY(BLKGETZONESZ),
.name = "--getzonesz",
.argtype = ARG_UINT,
.argval = -1,
.help = N_("get zone size")
},{
#endif
IOCTL_ENTRY(BLKFLSBUF),
.name = "--flushbufs",
.help = N_("flush buffers")
},{
IOCTL_ENTRY(BLKRRPART),
.name = "--rereadpt",
.help = N_("reread partition table")
}
};
static void __attribute__((__noreturn__)) usage(void)
{
size_t i;
fputs(USAGE_HEADER, stdout);
fprintf(stdout, _(
" %1$s [-v|-q] commands devices\n"
" %1$s --report [devices]\n"
" %1$s -h|-V\n"
), program_invocation_short_name);
fputs(USAGE_SEPARATOR, stdout);
fputsln(_("Call block device ioctls from the command line."), stdout);
fputs(USAGE_OPTIONS, stdout);
fputsln(_(" -q quiet mode"), stdout);
fputsln(_(" -v verbose mode"), stdout);
fputsln(_(" --report print report for specified (or all) devices"), stdout);
fputs(USAGE_SEPARATOR, stdout);
fprintf(stdout, USAGE_HELP_OPTIONS(16));
fputs(USAGE_SEPARATOR, stdout);
fputsln(_("Available commands:"), stdout);
fprintf(stdout, _(" %-25s get size in 512-byte sectors\n"), "--getsz");
for (i = 0; i < ARRAY_SIZE(bdcms); i++) {
if (bdcms[i].argname)
fprintf(stdout, " %s %-*s %s\n", bdcms[i].name,
(int)(24 - strlen(bdcms[i].name)),
bdcms[i].argname, _(bdcms[i].help));
else
fprintf(stdout, " %-25s %s\n", bdcms[i].name,
_(bdcms[i].help));
}
fprintf(stdout, USAGE_MAN_TAIL("blockdev(8)"));
exit(EXIT_SUCCESS);
}
static int find_cmd(char *s)
{
size_t j;
for (j = 0; j < ARRAY_SIZE(bdcms); j++)
if (!strcmp(s, bdcms[j].name))
return j;
return -1;
}
static void do_commands(int fd, char **argv, int d);
static void report_header(void);
static int report_device(char *device, int quiet);
static int report_all_devices(void);
int main(int argc, char **argv)
{
int fd, d, j, k;
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
close_stdout_atexit();
if (argc < 2) {
warnx(_("not enough arguments"));
errtryhelp(EXIT_FAILURE);
}
/* -V not together with commands */
if (!strcmp(argv[1], "-V") || !strcmp(argv[1], "--version"))
print_version(EXIT_SUCCESS);
if (!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help"))
usage();
/* --report not together with other commands */
if (!strcmp(argv[1], "--report")) {
int rc = 0;
report_header();
if (argc > 2) {
for (d = 2; d < argc; d++)
rc += report_device(argv[d], 0);
} else {
rc = report_all_devices();
}
return rc ? EXIT_FAILURE : EXIT_SUCCESS;
}
/* do each of the commands on each of the devices */
/* devices start after last command */
for (d = 1; d < argc; d++) {
j = find_cmd(argv[d]);
if (j >= 0) {
if (bdcms[j].argname)
d++;
continue;
}
if (!strcmp(argv[d], "--getsz"))
continue;
if (!strcmp(argv[d], "--")) {
d++;
break;
}
if (argv[d][0] != '-')
break;
}
if (d >= argc) {
warnx(_("no device specified"));
errtryhelp(EXIT_FAILURE);
}
for (k = d; k < argc; k++) {
fd = open(argv[k], O_RDONLY, 0);
if (fd < 0)
err(EXIT_FAILURE, _("cannot open %s"), argv[k]);
do_commands(fd, argv, d);
close(fd);
}
return EXIT_SUCCESS;
}
static void do_commands(int fd, char **argv, int d)
{
int res, i, j;
int iarg = 0;
unsigned int uarg = 0;
unsigned short huarg = 0;
long larg = 0;
long long llarg = 0;
unsigned long lu = 0;
unsigned long long llu = 0;
uint64_t sectors = 0;
int verbose = 0;
for (i = 1; i < d; i++) {
/* Skip the "--" separator if present. */
if (!strcmp(argv[i], "--"))
continue;
if (!strcmp(argv[i], "-v")) {
verbose = 1;
continue;
}
if (!strcmp(argv[i], "-q")) {
verbose = 0;
continue;
}
if (!strcmp(argv[i], "--getsz")) {
res = blkdev_get_sectors(fd, §ors);
if (res == 0) {
if (verbose)
printf(_("get size in 512-byte sectors: "));
printf("%ju\n", (uintmax_t) sectors);
}
else
errx(EXIT_FAILURE,
_("could not get device size"));
continue;
}
j = find_cmd(argv[i]);
if (j == -1) {
warnx(_("Unknown command: %s"), argv[i]);
errtryhelp(EXIT_FAILURE);
}
switch (bdcms[j].argtype) {
default:
case ARG_NONE:
res = ioctl(fd, bdcms[j].ioc, 0);
break;
case ARG_USHRT:
huarg = bdcms[j].argval;
res = ioctl(fd, bdcms[j].ioc, &huarg);
break;
case ARG_INT:
if (bdcms[j].argname) {
if (i == d - 1) {
warnx(_("%s requires an argument"),
bdcms[j].name);
errtryhelp(EXIT_FAILURE);
}
iarg = strtos32_or_err(argv[++i], _("failed to parse command argument"));
} else
iarg = bdcms[j].argval;
res = bdcms[j].flags & FL_NOPTR ?
ioctl(fd, bdcms[j].ioc, iarg) :
ioctl(fd, bdcms[j].ioc, &iarg);
break;
case ARG_UINT:
uarg = bdcms[j].argval;
res = ioctl(fd, bdcms[j].ioc, &uarg);
break;
case ARG_LONG:
larg = bdcms[j].argval;
res = ioctl(fd, bdcms[j].ioc, &larg);
break;
case ARG_LLONG:
llarg = bdcms[j].argval;
res = ioctl(fd, bdcms[j].ioc, &llarg);
break;
case ARG_ULONG:
lu = bdcms[j].argval;
res = ioctl(fd, bdcms[j].ioc, &lu);
break;
case ARG_ULLONG:
llu = bdcms[j].argval;
res = ioctl(fd, bdcms[j].ioc, &llu);
break;
}
if (res == -1) {
warn(_("ioctl error on %s"), bdcms[j].iocname);
if (verbose)
printf(_("%s failed.\n"), _(bdcms[j].help));
exit(EXIT_FAILURE);
}
if (bdcms[j].argtype == ARG_NONE ||
(bdcms[j].flags & FL_NORESULT)) {
if (verbose)
printf(_("%s succeeded.\n"), _(bdcms[j].help));
continue;
}
if (verbose)
printf("%s: ", _(bdcms[j].help));
switch (bdcms[j].argtype) {
case ARG_USHRT:
printf("%hu\n", huarg);
break;
case ARG_INT:
printf("%d\n", iarg);
break;
case ARG_UINT:
printf("%u\n", uarg);
break;
case ARG_LONG:
printf("%ld\n", larg);
break;
case ARG_LLONG:
printf("%lld\n", llarg);
break;
case ARG_ULONG:
printf("%lu\n", lu);
break;
case ARG_ULLONG:
printf("%llu\n", llu);
break;
}
}
}
static int report_all_devices(void)
{
FILE *procpt;
char line[200];
char ptname[200 + 1];
char device[210];
int ma, mi, sz;
int rc = 0;
procpt = fopen(_PATH_PROC_PARTITIONS, "r");
if (!procpt)
err(EXIT_FAILURE, _("cannot open %s"), _PATH_PROC_PARTITIONS);
while (fgets(line, sizeof(line), procpt)) {
if (sscanf(line, " %d %d %d %200[^\n ]",
&ma, &mi, &sz, ptname) != 4)
continue;
snprintf(device, sizeof(device), "/dev/%s", ptname);
rc += report_device(device, 1);
}
fclose(procpt);
return rc;
}
static int report_device(char *device, int quiet)
{
int fd;
int ro, ssz, bsz;
int rc = 0;
long ra;
uint64_t bytes, start = 0;
char start_str[16] = { "\0" };
struct stat st;
fd = open(device, O_RDONLY | O_NONBLOCK);
if (fd < 0) {
if (!quiet)
warn(_("cannot open %s"), device);
return 1;
}
ro = ssz = bsz = 0;
ra = 0;
if (fstat(fd, &st) == 0) {
dev_t disk;
struct path_cxt *pc;
pc = ul_new_sysfs_path(st.st_rdev, NULL, NULL);
if (pc &&
sysfs_blkdev_get_wholedisk(pc, NULL, 0, &disk) == 0 &&
disk != st.st_rdev) {
if (ul_path_read_u64(pc, &start, "start") != 0)
/* TRANSLATORS: Start sector not available. Max. 15 letters. */
snprintf(start_str, sizeof(start_str), "%15s", _("N/A"));
}
ul_unref_path(pc);
}
if (!*start_str)
snprintf(start_str, sizeof(start_str), "%15ju", start);
if (ioctl(fd, BLKROGET, &ro) == 0 &&
ioctl(fd, BLKRAGET, &ra) == 0 &&
ioctl(fd, BLKSSZGET, &ssz) == 0 &&
ioctl(fd, BLKBSZGET, &bsz) == 0 &&
blkdev_get_size(fd, &bytes) == 0) {
printf("%s %5ld %5d %5d %s %15" PRIu64 " %s\n",
ro ? "ro" : "rw", ra, ssz, bsz, start_str, bytes, device);
} else {
if (!quiet)
warnx(_("ioctl error on %s"), device);
rc = 1;
}
close(fd);
return rc;
}
static void report_header(void)
{
printf(_("RO RA SSZ BSZ StartSec Size Device\n"));
}
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