+/* vi: set sw=4 ts=4: */
/*
* mkswap.c - set up a linux swap device
*
#include <string.h>
#include <fcntl.h>
#include <stdlib.h>
-#include <sys/ioctl.h> /* for _IO */
+#include <sys/ioctl.h> /* for _IO */
#include <sys/utsname.h>
#include <sys/stat.h>
-#include <asm/page.h> /* for PAGE_SIZE and PAGE_SHIFT */
+#include <asm/page.h> /* for PAGE_SIZE and PAGE_SHIFT */
/* we also get PAGE_SIZE via getpagesize() */
-static const char mkswap_usage[] = "mkswap [-c] [-v0|-v1] device [block-count]\n\n"
-"Prepare a disk partition to be used as a swap partition.\n\n"
-"Options:\n"
-"\t-c\t\tCheck for read-ability.\n"
-"\t-v0\t\tMake version 0 swap [max 128 Megs].\n"
-"\t-v1\t\tMake version 1 swap [big!] (default for kernels > 2.1.117).\n"
-"\tblock-count\tNumber of block to use (default is entire partition).\n";
+static const char mkswap_usage[] =
+ "mkswap [-c] [-v0|-v1] device [block-count]\n\n"
+ "Prepare a disk partition to be used as a swap partition.\n\n"
+ "Options:\n" "\t-c\t\tCheck for read-ability.\n"
+ "\t-v0\t\tMake version 0 swap [max 128 Megs].\n"
+ "\t-v1\t\tMake version 1 swap [big!] (default for kernels > 2.1.117).\n"
+
+ "\tblock-count\tNumber of block to use (default is entire partition).\n";
#ifndef _IO
#define BLKGETSIZE _IO(0x12,96)
#endif
-static char * program_name = "mkswap";
-static char * device_name = NULL;
+static char *program_name = "mkswap";
+static char *device_name = NULL;
static int DEV = -1;
static long PAGES = 0;
static int check = 0;
#define MAKE_VERSION(p,q,r) (65536*(p) + 256*(q) + (r))
-static int
-linux_version_code(void) {
+static int linux_version_code(void)
+{
struct utsname my_utsname;
int p, q, r;
p = atoi(strtok(my_utsname.release, "."));
q = atoi(strtok(NULL, "."));
r = atoi(strtok(NULL, "."));
- return MAKE_VERSION(p,q,r);
+ return MAKE_VERSION(p, q, r);
}
return 0;
}
static int *signature_page;
struct swap_header_v1 {
- char bootbits[1024]; /* Space for disklabel etc. */
+ char bootbits[1024]; /* Space for disklabel etc. */
unsigned int version;
unsigned int last_page;
unsigned int nr_badpages;
unsigned int badpages[1];
} *p;
-static void
-init_signature_page() {
+static void init_signature_page()
+{
pagesize = getpagesize();
#ifdef PAGE_SIZE
fprintf(stderr, "Assuming pages of size %d\n", pagesize);
#endif
signature_page = (int *) malloc(pagesize);
- memset(signature_page,0,pagesize);
+ memset(signature_page, 0, pagesize);
p = (struct swap_header_v1 *) signature_page;
}
-static void
-write_signature(char *sig) {
+static void write_signature(char *sig)
+{
char *sp = (char *) signature_page;
- strncpy(sp+pagesize-10, sig, 10);
+ strncpy(sp + pagesize - 10, sig, 10);
}
#define V0_MAX_PAGES (8 * (pagesize - 10))
#define MAX_BADPAGES ((pagesize-1024-128*sizeof(int)-10)/sizeof(int))
-static void bit_set (unsigned int *addr, unsigned int nr)
+static void bit_set(unsigned int *addr, unsigned int nr)
{
unsigned int r, m;
addr += nr / (8 * sizeof(int));
+
r = *addr;
m = 1 << (nr & (8 * sizeof(int) - 1));
+
*addr = r | m;
}
-static int bit_test_and_clear (unsigned int *addr, unsigned int nr)
+static int bit_test_and_clear(unsigned int *addr, unsigned int nr)
{
unsigned int r, m;
addr += nr / (8 * sizeof(int));
+
r = *addr;
m = 1 << (nr & (8 * sizeof(int) - 1));
+
*addr = r & ~m;
return (r & m) != 0;
}
-void
-die(const char *str) {
+void die(const char *str)
+{
fprintf(stderr, "%s: %s\n", program_name, str);
- exit( FALSE);
+ exit(FALSE);
}
-void
-page_ok(int page) {
- if (version==0)
+void page_ok(int page)
+{
+ if (version == 0)
bit_set(signature_page, page);
}
-void
-page_bad(int page) {
+void page_bad(int page)
+{
if (version == 0)
bit_test_and_clear(signature_page, page);
else {
badpages++;
}
-void
-check_blocks(void) {
+void check_blocks(void)
+{
unsigned int current_page;
int do_seek = 1;
char *buffer;
page_ok(current_page++);
continue;
}
- if (do_seek && lseek(DEV,current_page*pagesize,SEEK_SET) !=
- current_page*pagesize)
+ if (do_seek && lseek(DEV, current_page * pagesize, SEEK_SET) !=
+ current_page * pagesize)
die("seek failed in check_blocks");
if ((do_seek = (pagesize != read(DEV, buffer, pagesize)))) {
page_bad(current_page++);
printf("%d bad pages\n", badpages);
}
-static long valid_offset (int fd, int offset)
+static long valid_offset(int fd, int offset)
{
char ch;
- if (lseek (fd, offset, 0) < 0)
+ if (lseek(fd, offset, 0) < 0)
return 0;
- if (read (fd, &ch, 1) < 1)
+ if (read(fd, &ch, 1) < 1)
return 0;
return 1;
}
-static int
-find_size (int fd)
+static int find_size(int fd)
{
unsigned int high, low;
low = 0;
- for (high = 1; high > 0 && valid_offset (fd, high); high *= 2)
+ for (high = 1; high > 0 && valid_offset(fd, high); high *= 2)
low = high;
- while (low < high - 1)
- {
+ while (low < high - 1) {
const int mid = (low + high) / 2;
- if (valid_offset (fd, mid))
+ if (valid_offset(fd, mid))
low = mid;
else
high = mid;
}
/* return size in pages, to avoid integer overflow */
-static long
-get_size(const char *file)
+static long get_size(const char *file)
{
- int fd;
- long size;
+ int fd;
+ long size;
fd = open(file, O_RDONLY);
if (fd < 0) {
exit(1);
}
if (ioctl(fd, BLKGETSIZE, &size) >= 0) {
- int sectors_per_page = pagesize/512;
+ int sectors_per_page = pagesize / 512;
+
size /= sectors_per_page;
} else {
size = find_size(fd) / pagesize;
return size;
}
-int mkswap_main(int argc, char ** argv)
+int mkswap_main(int argc, char **argv)
{
- char * tmp;
+ char *tmp;
struct stat statbuf;
int sz;
int maxpages;
if (argc && *argv)
program_name = *argv;
- init_signature_page(); /* get pagesize */
+ init_signature_page(); /* get pagesize */
while (argc-- > 1) {
argv++;
if (argv[0][0] != '-') {
if (device_name) {
- int blocks_per_page = pagesize/1024;
- PAGES = strtol(argv[0],&tmp,0)/blocks_per_page;
+ int blocks_per_page = pagesize / 1024;
+
+ PAGES = strtol(argv[0], &tmp, 0) / blocks_per_page;
if (*tmp)
- usage( mkswap_usage);
+ usage(mkswap_usage);
} else
device_name = argv[0];
} else {
switch (argv[0][1]) {
- case 'c':
- check=1;
- break;
- case 'f':
- force=1;
- break;
- case 'v':
- version=atoi(argv[0]+2);
- break;
- default:
- usage( mkswap_usage);
+ case 'c':
+ check = 1;
+ break;
+ case 'f':
+ force = 1;
+ break;
+ case 'v':
+ version = atoi(argv[0] + 2);
+ break;
+ default:
+ usage(mkswap_usage);
}
}
}
if (!device_name) {
fprintf(stderr,
- "%s: error: Nowhere to set up swap on?\n",
- program_name);
- usage( mkswap_usage);
+ "%s: error: Nowhere to set up swap on?\n", program_name);
+ usage(mkswap_usage);
}
sz = get_size(device_name);
if (!PAGES) {
PAGES = sz;
} else if (PAGES > sz && !force) {
fprintf(stderr,
- "%s: error: "
- "size %ld is larger than device size %d\n",
- program_name,
- PAGES*(pagesize/1024), sz*(pagesize/1024));
- exit( FALSE);
+ "%s: error: "
+ "size %ld is larger than device size %d\n",
+ program_name,
+ PAGES * (pagesize / 1024), sz * (pagesize / 1024));
+ exit(FALSE);
}
if (version == -1) {
if (PAGES <= V0_MAX_PAGES)
version = 0;
- else if (linux_version_code() < MAKE_VERSION(2,1,117))
+ else if (linux_version_code() < MAKE_VERSION(2, 1, 117))
version = 0;
else if (pagesize < 2048)
version = 0;
}
if (version != 0 && version != 1) {
fprintf(stderr, "%s: error: unknown version %d\n",
- program_name, version);
- usage( mkswap_usage);
+ program_name, version);
+ usage(mkswap_usage);
}
if (PAGES < 10) {
fprintf(stderr,
- "%s: error: swap area needs to be at least %ldkB\n",
- program_name, (long)(10 * pagesize / 1024));
- usage( mkswap_usage);
+ "%s: error: swap area needs to be at least %ldkB\n",
+ program_name, (long) (10 * pagesize / 1024));
+ usage(mkswap_usage);
}
#if 0
maxpages = ((version == 0) ? V0_MAX_PAGES : V1_MAX_PAGES);
#else
if (!version)
maxpages = V0_MAX_PAGES;
- else if (linux_version_code() >= MAKE_VERSION(2,2,1))
+ else if (linux_version_code() >= MAKE_VERSION(2, 2, 1))
maxpages = V1_MAX_PAGES;
else {
maxpages = V1_OLD_MAX_PAGES;
if (PAGES > maxpages) {
PAGES = maxpages;
fprintf(stderr, "%s: warning: truncating swap area to %ldkB\n",
- program_name, PAGES * pagesize / 1024);
+ program_name, PAGES * pagesize / 1024);
}
- DEV = open(device_name,O_RDWR);
+ DEV = open(device_name, O_RDWR);
if (DEV < 0 || fstat(DEV, &statbuf) < 0) {
perror(device_name);
- exit( FALSE);
+ exit(FALSE);
}
if (!S_ISBLK(statbuf.st_mode))
- check=0;
+ check = 0;
else if (statbuf.st_rdev == 0x0300 || statbuf.st_rdev == 0x0340)
die("Will not try to make swapdevice on '%s'");
#ifdef __sparc__
if (!force && version == 0) {
/* Don't overwrite partition table unless forced */
- unsigned char *buffer = (unsigned char *)signature_page;
+ unsigned char *buffer = (unsigned char *) signature_page;
unsigned short *q, sum;
if (read(DEV, buffer, 512) != 512)
die("fatal: first page unreadable");
if (buffer[508] == 0xDA && buffer[509] == 0xBE) {
- q = (unsigned short *)(buffer + 510);
+ q = (unsigned short *) (buffer + 510);
for (sum = 0; q >= (unsigned short *) buffer;)
sum ^= *q--;
if (!sum) {
%s: Device '%s' contains a valid Sun disklabel.\n\
This probably means creating v0 swap would destroy your partition table\n\
No swap created. If you really want to create swap v0 on that device, use\n\
-the -f option to force it.\n",
- program_name, device_name);
- exit( FALSE);
+the -f option to force it.\n", program_name, device_name);
+ exit(FALSE);
}
}
}
if (version == 0 || check)
check_blocks();
- if (version == 0 && !bit_test_and_clear(signature_page,0))
+ if (version == 0 && !bit_test_and_clear(signature_page, 0))
die("fatal: first page unreadable");
if (version == 1) {
p->version = version;
- p->last_page = PAGES-1;
+ p->last_page = PAGES - 1;
p->nr_badpages = badpages;
}
if (goodpages <= 0)
die("Unable to set up swap-space: unreadable");
printf("Setting up swapspace version %d, size = %ld bytes\n",
- version, (long)(goodpages*pagesize));
+ version, (long) (goodpages * pagesize));
write_signature((version == 0) ? "SWAP-SPACE" : "SWAPSPACE2");
offset = ((version == 0) ? 0 : 1024);
if (lseek(DEV, offset, SEEK_SET) != offset)
die("unable to rewind swap-device");
- if (write(DEV,(char*)signature_page+offset, pagesize-offset)
- != pagesize-offset)
+ if (write(DEV, (char *) signature_page + offset, pagesize - offset)
+ != pagesize - offset)
die("unable to write signature page");
/*
* is not actually on disk. (This is a kernel bug.)
*/
if (fsync(DEV))
- die("fsync failed");
- exit ( TRUE);
+ die("fsync failed");
+ exit(TRUE);
}
projects / oweals / busybox.git / blobdiff